Reyrolle
Protection
Devices
7SR24 Duobias
Overcurrent Relay
Answers for energy.
7SR242 Duobias Contents
Contents
Technical Manual Chapters
1.
Description of Operation
2.
Settings, Configuration & Instruments
(Appendix 1) Settings 7SR242
3.
Performance Specification
4.
Data Communications
5.
Installation
6.
Commissioning and Maintenance
7.
Applications Guide
(Appendix 1) Commissioning Test Sheet
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Description Of Operation
7SR242 Duobias
Multi-Function 2-Winding Transformer Protection Relay
Document Release History
This document is issue 2010/02. The list of revisions up to and including this issue is:
2010/02
Document reformat due to rebrand
2010/02
Third issue. Software revision 2662H80001 R4c-3
2008/07
Second issue. Software revision 2662H80001R3d-2c.
2008/05
First issue
Software Revision History
2010/02
2662H80001 R4c-3
Revisions to: VT ratio settings, 87BD 1st bias slope limit setting
increments, CB fail function, LED CONFIG menu, DATA
STORAGE menu.
Added: Open circuit detection (46BC), CONTROL MODE
menu, Close circuit supervision (74CCS), Measured earth fault
undercurrent (37G), Pulsed output contacts.
2008/07
2662H80001R3d-2c.
Demand metering. Optional DNP3.0 data comms.
2008/05
2662H80001R3-2b
First Release
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Description Of Operation
Contents
Document Release History....................................................................................................................1
Software Revision History.....................................................................................................................1
Contents ..................................................................................................................................................2
List of Figures.........................................................................................................................................4
List of Tables ..........................................................................................................................................5
Section 1: Introduction ..........................................................................................................................6
Current Transformer Circuits ............................................................................................................6
External Resistors.............................................................................................................................6
Fibre Optic Communication ..............................................................................................................6
Front Cover.......................................................................................................................................6
Section 2: Hardware Description ........................................................................................................13
2.1 General ...................................................................................................................................13
2.2 Case........................................................................................................................................13
2.3 Front Cover .............................................................................................................................13
2.4 Power Supply Unit (PSU)........................................................................................................14
2.5 Operator Interface/ Fascia ......................................................................................................14
2.6 Current Inputs .........................................................................................................................16
2.7 Voltage Input ...........................................................................................................................16
2.8 Binary inputs ...........................................................................................................................17
2.9 Binary outputs (Output Relays)...............................................................................................18
2.10 Virtual Input/Outputs ...............................................................................................................19
2.11 Self Monitoring ........................................................................................................................19
2.11.1 Protection Healthy/Defective......................................................................................19
Section 3: Protection Functions .........................................................................................................20
3.1 Current Protection: Differential Protection ..............................................................................20
3.1.1 ICT..............................................................................................................................20
3.1.2 Overall Biased Differential (87BD) .............................................................................21
3.1.3 87HS ..........................................................................................................................23
3.2 Current Protection: Phase Overcurrent (51, 50) .....................................................................25
3.2.1 Instantaneous Overcurrent Protection (50)................................................................25
3.2.2 Time Delayed Overcurrent Protection (51) ................................................................26
3.3 Current Protection: Derived Earth Fault (50N, 51N) ...............................................................27
3.3.1 Instantaneous Derived Earth Fault Protection (50N) .................................................27
3.3.2 Time Delayed Derived Earth Fault Protection (51N)..................................................28
3.4 Current Protection: Measured Earth Fault (50G, 51G) ...........................................................29
3.4.1 Instantaneous Measured Earth Fault Protection (50G) .............................................29
3.4.2 Time Delayed Measured Earth Fault Protection (51G)..............................................30
3.5 Current Protection: High Impedance Restricted Earth............................................................31
Fault (64H)...................................................................................................................................31
3.6 Open Circuit (46BC)................................................................................................................32
3.7 Current Protection: Negative Phase Sequence ......................................................................33
Overcurrent (46NPS) ......................................................................................................................33
3.8 Current Protection: Under-Current (37, 37G) .........................................................................34
3.9 Current Protection: Thermal Overload (49) ............................................................................35
3.10 Voltage Protection: Over Fluxing (24).....................................................................................37
3.11 Voltage Protection: Under/Over Voltage (27/59) ....................................................................39
©2010 Siemens Protection Devices Limited
Chapter 1 Page 2 of 52
7SR242 Duobias Description Of Operation
3.12 Voltage Protection: Neutral Overvoltage (59N) ......................................................................40
3.13 Voltage Protection: Under/Over Frequency (81) ....................................................................41
Section 4: Control & Logic Functions ................................................................................................42
4.1 Quick Logic .............................................................................................................................42
Section 5: Supervision Functions ......................................................................................................44
5.1 Circuit Breaker Failure (50BF) ................................................................................................44
5.2 Trip/Close Circuit Supervision (74TCS/74CCS) .....................................................................45
5.3 Inrush Detector (81HBL2) .......................................................................................................46
5.4 OverFluxing Detector (81HBL5)..............................................................................................46
5.5 Demand...................................................................................................................................47
Section 6: Other Features....................................................................................................................48
6.1 Data Communications.............................................................................................................48
6.2 Maintenance............................................................................................................................48
6.2.1 Output Matrix Test......................................................................................................48
6.2.2 CB Counters...............................................................................................................48
6.2.3 I2t CB Wear ................................................................................................................48
6.3 Data Storage ...........................................................................................................................49
6.3.1 General.......................................................................................................................49
6.3.2 Event Records............................................................................................................49
6.3.3 Waveform Records. ...................................................................................................49
6.3.4 Fault Records .............................................................................................................50
6.3.5 Demand/Data Log ......................................................................................................50
6.4 Metering ..................................................................................................................................50
6.5 Operating Mode ......................................................................................................................51
6.6 Control Mode...........................................................................................................................51
6.7 Real Time Clock......................................................................................................................51
6.7.1 Time Synchronisation – Data Comms .......................................................................52
6.7.2 Time Synchronisation – Binary Input .........................................................................52
6.7.3 Time Synchronisation – IRIG-B (Optional).................................................................52
6.8 Settings Groups ......................................................................................................................52
6.9 Password Feature...................................................................................................................52
©2010 Siemens Protection Devices Limited
Chapter 1 Page 3 of 52
7SR242 Duobias Description Of Operation
List of Figures
Figure 1-1 Functional Diagram: 7SR242_-2_A_1-0AA0 Relay............................................................9
Figure 1-2 Functional Diagram: 7SR242_-2_A_1-0BA0 Relay..............................................................10
Figure 1-3 Functional Diagram: 7SR242_-2_A_1-0CA0 Relay .............................................................11
Figure 1-4 Connection Diagram: 7SR242 Relay................................................................................12
Figure 2-1 7SR24 with 3 + 16 LEDs in E8 Case................................................................................14
Figure 2-2 Binary Input Logic .............................................................................................................17
Figure 2-3 Binary Output Logic ..........................................................................................................19
Figure 3-1 Biased Differential Characteristic..........................................................................................21
Figure 3-2 Functional Diagram for Biased Current Differential Protection.............................................22
Figure 3-3 Differential Highset Characteristic ........................................................................................23
Figure 3-4 Logic Diagram: High Set Current Differential Protection ......................................................24
Figure 3-5 Logic Diagram: Instantaneous Over-current Element .......................................................25
Figure 3-6 Logic Diagram: Time Delayed Overcurrent Element .........................................................26
Figure 3-7 Logic Diagram: Instantaneous Derived Earth Fault Element ............................................27
Figure 3-8 Logic Diagram: Derived Time Delayed Earth Fault Protection..........................................28
Figure 3-9 Logic Diagram: Measured Instantaneous Earth-fault Element..........................................29
Figure 3-10 Logic Diagram: Time Delayed Measured Earth Fault Element (51G) ...............................30
Figure 3-11 Logic Diagram: High Impedance REF (64H) ......................................................................31
Figure 3-12 Logic Diagram: Open Circuit Function (46BC) ..................................................................32
Figure 3-13 Logic Diagram: Negative Phase Sequence Overcurrent (46NPS)....................................33
Figure 3-14 Logic Diagram: Undercurrent Detector (37, 37G)..............................................................34
Figure 3-15 Logic Diagram: Thermal Overload Protection (49) ............................................................36
Figure 3-16 Inverse Over-fluxing Characteristic (24IT) ..........................................................................37
Figure 3-17 Logic Diagram: Overfluxing Elements (24) .........................................................................38
Figure 3-18 Logic Diagram: Under/Over Voltage Elements (27/59) .....................................................39
Figure 3-19 Logic Diagram: Neutral Overvoltage Element ...................................................................40
Figure 3-20 Logic Diagram: Under/Over Frequency Detector (81).......................................................41
Figure 4-1 Sequence Diagram showing PU/DO Timers in Quick Logic (Counter Reset
Mode Off) ...........................................................................................................................43
Figure 5-1 Logic Diagram: Circuit Breaker Fail Protection (50BF).........................................................44
Figure 5-2 Logic Diagram: Trip Circuit Supervision Feature (74TCS) ................................................45
Figure 5-3 Logic Diagram: Close Circuit Supervision Feature (74CCS).............................................45
Figure 5-4 Logic Diagram: Inrush Detector Feature (81HBL2) ...........................................................46
Figure 5-5 Logic Diagram: Overfluxing Detector Feature (81HBL5)...................................................46
©2010 Siemens Protection Devices Limited
Chapter 1 Page 4 of 52
7SR242 Duobias Description Of Operation
List of Tables
Table 1-1: 7SR242 Ordering Options....................................................................................................7
Table 2-1 Summary of 7SR24 Relay Configurations .........................................................................13
Table 6-1 Operation Mode .....................................................................................................................51
Symbols and Nomenclature
The following notational and formatting conventions are used within the remainder of this document:
x
Setting Menu Location
MAIN MENU>SUB-MENU
x
Setting:
Elem name -Setting
x
Setting value:
value
x
Alternatives:
[1st] [2nd] [3rd]
Elem Char Dir
Binary input signal
visible to user
Elem Inhibit
Binary Output visible to user
Elem Starter
List of settings associated with a specific
function
Appropriate list is TRUE when setting
selected.
Non-Dir
Forward
Reverse
Common setting for multiple functions
Digital signal not visible to
user, to/from another element
Digital signal not visible to
user, internal to this element
Analogue signal with signal
description
PhaseAFwd
L1 Dir Blk
IL1
Common control input (c) for multiple
functions. All functions are enabled
when control input is TRUE.
Function.
Elem Reset Delay
c
start
c
trip
start
Individual functions are enabled when
associated control input (c) is TRUE.
c
And Gate
(2 inputs shown)
Or Gate
(3 inputs shown)
&
t1
EVENT: IEC, Modbus or DNP
Where applicable
Relay instrument
Exclusive Or (XOR) Gate
(3 inputs shown)
trip
EVENT
INST.
1
©2010 Siemens Protection Devices Limited
Chapter 1 Page 5 of 52
7SR242 Duobias Description Of Operation
Section 1: Introduction
This manual is applicable to the following relays:
x
7SR242 Multi-Function 2-Winding Transformer Protection Relay
The 7SR242 relay integrates the protection and control elements required to provide a complete transformer
protection.
The ‘Ordering Options’ Tables summarise the features available in each model.
General Safety Precautions
!
!
Current Transformer Circuits
The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can result in
injury to personnel or damage to equipment.
External Resistors
Where external resistors are fitted to relays, these may present a danger of electric shock or burns, if touched.
!
Fibre Optic Communication
Where fibre optic communication devices are fitted, these should not be viewed directly. Optical power meters
should be used to determine the operation or signal level of the device.
!
Front Cover
The front cover provides additional securing of the relay element within the case. The relay cover should be in
place during normal operating conditions.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 6 of 52
7SR242 Duobias Description Of Operation
Table 1-1: 7SR242 Ordering Options
DUOBIAS-M
Multifunctional 2 winding
transformer differential
protection
7 S R 2 4 2
|
|
|
|
|
|
|
|
Ź Protection Product
Transformer
Relay Type
Differential (2 winding)
| |
| |
4 |
|
|
2
Case I/O and Fascia
E8 case, 6 CT, 2 EF/REF CT, 1 VT, 9 Binary Inputs / 6 Binary Outputs,
16 LEDs
E10 case, 6 CT, 2 EF/REF CT, 1 VT, 19 Binary Inputs / 14 Binary Outputs,
24 LEDs
Measuring Input
1/5 A, 63.5/110V, 50/60Hz
Auxiliary voltage
30 to 220V DC, binary input threshold 19V DC
30 to 220V DC, binary input threshold 88V DC
Communication Interface
Standard version – included in all models, USB front port, RS485 rear port
Standard version – plus additional rear F/O ST connectors (x2) and IRIG-B
Protocol
IEC 60870-5-103 and Modbus RTU (user selectable setting)
IEC 60870-5-103 and Modbus RTU and DNP 3.0 (user selectable)
Protection Function Packages
Option A:
Standard version – Included in all models
- 81HBL2
Inrush Detector
- 81HBL5
Overfluxing detector
- 87BD
Biased current differential
- 87HS
Current differential highest
Programmable logic
For each winding/circuit breaker
- 50BF
Circuit breaker fail
- 64H
High impedance REF
- 74TCS/CCS
Trip/close circuit supervision
Option B:
- 37
- 46BC
- 46NPS
- 49
- 50
- 50G/50N
- 51
- 51G/51N
Standard version – plus
Undercurrent
Open circuit
Negative phase sequence overcurrent
Thermal overload
Instantaneous phase fault overcurrent
Instantaneous earth fault
Time delayed phase fault overcurrent
Time delayed earth fault
2
|
3
- 2
Aƒ1
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
A
| |
B
| |
| |
| |
1 |
2 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2
1
2
- 0
ƒA 0
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
A |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
B |
| |
| |
| |
| |
| |
| |
| |
| |
(continued on following page )
©2010 Siemens Protection Devices Limited
Chapter 1 Page 7 of 52
7SR242 Duobias Description Of Operation
DUOBIAS-M
(continued from previous page)
7 S R 2 4 2
Option C:
- 24
- 27/59
- 59N
- 81
- 37
- 46BC
- 46NPS
- 49
- 50
- 50G/50N
- 51
- 51G/51N
Standard version - plus
Overfluxing
Under/overvoltage
Neutral voltage displacement
Under/overfrequency
Undercurrent
Open circuit
Negative phase sequence overcurrent
Thermal overload
Instantaneous phase fault overcurrent
Instantaneous earth fault
Time delayed phase fault overcurrent
Time delayed earth fault
Additional Functionality
No Additional Functionality
©2010 Siemens Protection Devices Limited
- 2
Aƒ
1 - 0 C A 0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
A
Chapter 1 Page 8 of 52
7SR242 Duobias Description Of Operation
7SR242n-2aAn1-0AA0
W1-IL1 (IA)
50
BF-1
81
HBL
2
81
HBL
5
W1-IL2 (IB)
50
BF-1
81
HBL
2
81
HBL
5
W1-IL3 (IC)
50
BF-1
81
HBL
2
81
HBL
5
50
BF-1
I4
64H
IG1
ICT
87HS
IG2
50
BF-2
I4
87BD
ICT
64H
74
CCS
(x6)
74
TCS
(x6)
W2-IL3 (IC)
W2-IL2 (IB)
W2-IL1 (IA)
Figure 1-1
50
BF-2
81
HBL
2
81
HBL
5
50
BF-2
81
HBL
2
81
HBL
5
50
BF-2
81
HBL
2
81
HBL
5
Functional Diagram: 7SR242_-2_A_1-0AA0 Relay
©2010 Siemens Protection Devices Limited
Chapter 1 Page 9 of 52
7SR242 Duobias Description Of Operation
Figure 1-2 Functional Diagram: 7SR242_-2_A_1-0BA0 Relay
©2010 Siemens Protection Devices Limited
Chapter 1 Page 10 of 52
7SR242 Duobias Description Of Operation
7SR242n-2aAn1-0CA0
W1-IL1 (IA)
37
(x2)
50
BF-1
50
(x2)
51
(x2)
49
81
HBL2
81
HBL5
W1-IL2 (IB)
37
(x2)
50
BF-1
50
(x2)
51
(x2)
49
81
HBL2
81
HBL5
W1-IL3 (IC)
37
(x2)
50
BF-1
50
(x2)
51
(x2)
49
81
HBL2
81
HBL5
50N
(x2)
51N
(x2)
46
BC
(x2)
46
NPS
(x4)
50G
(x2)
51G
(x4)
64H
37G
(x2)
IG1
50
BF-1
I4
ICT
Each function element
can be assigned to W1
or W2 CT inputs.
NOTE: The use of some
functions are mutually
exclusive
87HS
37G
IG2
W2-IL3 (IC)
W2-IL2 (IB)
W2-IL1 (IA)
V1 (VX)
50
BF-2
I4
50G
51G
87BD
ICT
64H
50N
51N
46
BC
46
NPS
74
CCS
(x6)
74
TCS
(x6)
37
50
BF-2
50
51
49
81
HBL2
81
HBL5
37
50
BF-2
50
51
49
81
HBL
2
81
HBL5
37
50
BF-2
50
51
49
81
HBL
2
81
HBL5
24
(x3)
27
59
(x4)
59N
(x2)
81
(x6)
Figure 1-3 Functional Diagram: 7SR242_-2_A_1-0CA0 Relay
©2010 Siemens Protection Devices Limited
Chapter 1 Page 11 of 52
7SR242 Duobias Description Of Operation
2
4
6
8
10
12
14
+ve
-ve
BI 10
7SR242
-ve
18
20
5
BO 8
BI 11
9
BI 12
BO 9
BI 13
BO 10
11
+ve
1
2
1
2
1
2
D
C
B
A
PSU
CT
CT/VT
Data
Comms
(Optional)
13
+ve
15
BO 11
17
BO 12
19
+ve
27
28
27
28
27
28
27
28
Rear View
Arrangement of terminals and modules
21
BI 15
-ve
+ve
BO 13
23
BO 14
25
27
+ve
NOTES
BI =
BO =
BI 17
24
2
Optional
I/O
7
+ve
BI 16
22
1
3
+ve
BI 14
16
1
BO 7
Binary Input
Binary Output
+ve
BI 18
26
28
22
24
28
Shows contacts internal to relay case
assembly.
Contacts close when the relay chassis is
withdrawn from case
+ve
BI 19
-ve
D
1
+ve
BO 1
-ve
3
GND.
5
BO 2
2
4
6
8
10
12
7
+ve
-ve
9
BI 1
11
+ve
-ve
BO 3
13
BI 2
15
+ve
-ve
17
BO 4
BI 3
19
21
14
A
16
Screen
18
B
20
Term.
18
20
22
24
26
28
17
19
21
23
25
27
1
BO 5
25
BO 6
27
1A
BI 4
BI 6
5A
BI 7
BI 8
W2-IL3 (IC)
BI 9
5A
B
11
12
1A
17
18
5A
W1-IL1 (IA)
IG2
4
5
9
10
2
3
7
8
1A
+ve
-ve
5
6
W2-IL2 (IB)
+ve
-ve
3
4
1A
+ve
-ve
5A
BI 5
+ve
-ve
1
2
W2-IL1 (IA)
+ve
-ve
26
C
+ve
-ve
23
5A
19
20
1A
6
7
5A
W1-IL2 (IB)
9
27
V1 (VX)
8
28
1A
10
11
5A
W1-IL3 (IC)
12
13
1A
14
15
16
Figure 1-4
5A
IG1
A
Connection Diagram: 7SR242 Relay
©2010 Siemens Protection Devices Limited
Chapter 1 Page 12 of 52
7SR242 Duobias Description Of Operation
Section 2: Hardware Description
2.1
General
The structure of the relay is based upon the Multi-function hardware platform. The relays are supplied in either
size E8 or size E10 cases (where 1 x E = width of approx. 26mm). The hardware design provides commonality
between products and components across the Multi-function range of relays.
Table 2-1
Relay
Summary of 7SR24 Relay Configurations
Current
Voltage
Binary
Output
LEDs
Case
Inputs
Inputs
Inputs
Relays
7SR2422
8
1
9
6
16
E8
7SR2423
8
1
19
14
24
E10
Relays are assembled from the following modules:
1) Front Fascia with three fixed function LEDs and ordering options of configurable LEDs.
2) Processor module
3) Analogue Input module ‘A’: 3 x Current + 6 x Binary Inputs
4) Analogue Input module ‘B’: 5 x Current + 1 x Voltage.
4) Power Supply and basic Binary Input (BI) and Binary Output (BO).
5) Optional Binary Input/Output Module
2.2
Case
The relays are housed in cases designed to fit directly into standard panel racks. The two case options have
widths of 208mm (E8) and 260 mm (E10), both have a height of 177 mm (4U). The required panel depth (with
wiring clearance) is 242 mm. An additional 75 mm depth clearance should be allowed to accommodate the
bending radius of fibre optic data communications cables if fitted.
The complete relay assembly is withdrawable from the front of the case. Contacts in the case ensure that the CT
circuits remain short-circuited when the relay is removed.
The rear terminal blocks comprise M4 female terminals for wire connections. Each terminal can accept two 4mm
crimps.
Located at the top rear of the case is a screw clamp earthing point, this must be connected to the main panel
earth.
2.3
Front Cover
With the transparent front cover in place the user only has access to the and TEST/RESET buttons,
allowing all areas of the menu system to be viewed, but preventing setting changes and control actions. The only
‘action’ that is permitted is to reset the Fault Data display, latched binary outputs and LEDs by using the
TEST/RESET button.
The front cover is used to secure the relay assembly in the case.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 13 of 52
7SR242 Duobias Description Of Operation
2.4
Power Supply Unit (PSU)
The relay PSU can be directly connected to any substation dc system rated from 30V dc to 220V dc.
In the event of the station battery voltage level falling below the relay minimum operate level the PSU will
automatically switch itself off and latch out – this prevents any PSU overload conditions occurring. The PSU is
reset by switching the auxiliary supply off then on.
2.5
Operator Interface/ Fascia
The operator interface is designed to provide a user-friendly method of controlling, entering settings and retrieving
data from the relay.
Figure 2-1
7SR24 with 3 + 16 LEDs in E8 Case
NOTE: Keys on cover not shown
The fascia is an integral part of the relay. Handles are located at each side of the element to allow it to be
withdrawn from the relay case.
Relay Information
Above the LCD three labels are provided, these provide the following information:
1) Product name and order code.
2) Nominal current rating, rated frequency, voltage rating, auxiliary dc supply rating, binary input supply
rating, configuration and serial number.
3) Blank label for user defined information.
A ‘template’ is available to allow users to create and print customised labels.
The warning and information labels on the relay fascia provide the following information:
©2010 Siemens Protection Devices Limited
Chapter 1 Page 14 of 52
7SR242 Duobias Description Of Operation
Liquid Crystal Display (LCD)
A 4 line by 20-character liquid crystal display indicates settings, instrumentation, fault data and control
commands.
To conserve power the display backlighting is extinguished when no buttons are pressed for a user defined
period. A setting within the “SYSTEM CONFIG” menu allows the timeout to be adjusted from 1 to 60 minutes and
“Off” (backlight permanently on). After an hour the display is completely de-activated. Pressing any key will reactivate the display.
The LCD contrast can be adjusted using a flat blade screwdriver to turn the screw located below the contrast
. Turning the screw clockwise increases the contrast, anti-clockwise reduces the contrast.
symbol
‘PROTECTION HEALTHY’ LED
This green LED is steadily illuminated to indicate that DC voltage has been applied to the relay power supply and
that the relay is operating correctly. If the internal relay watchdog detects an internal fault then this LED will
continuously flash.
‘PICKUP’ LED
This yellow LED is illuminated to indicate that a user selectable function(s) has picked up. The LED will self reset
after the initiating condition has been removed.
Functions are assigned to the PICKUP LED in the OUTPUT CONFIG>PICKUP CONFIG menu.
‘TRIP’ LED
This red LED is steadily illuminated to indicate that a user selectable function has operated to trip the circuit
breaker. Functions are assigned to the ‘Trip’ LED using the OUTPUT CONFIG>Trip Contacts setting.
Operation of the LED is latched and can be reset by either pressing the TEST/RESET button, energising a
suitably programmed binary input, or, by sending an appropriate command over the data communications
channel(s).
Indication LEDs
Relays have either 8 or 16 user programmable LED indicators. Each LED can be programmed to be illuminated
as either green, yellow or red. Where an LED is programmed to be lit both red and green it will illuminate yellow. .
Each LED can be assigned two different colours dependent upon whether a Start/Pickup or Operate condition
©2010 Siemens Protection Devices Limited
Chapter 1 Page 15 of 52
7SR242 Duobias Description Of Operation
initiates operation. The LED illumination colour is assigned in the OUTPUT CONFIG>LED CONFIG menu for both
Pickup and Operate initiation.
Functions are assigned to the LEDs in the OUTPUT CONFIG>OUTPUT MATRIX menu.
Each LED can be labelled by withdrawing the relay and inserting a label strip into the pocket behind the front
fascia. A ‘template’ is available to allow users to create and print customised legends.
Each LED can be user programmed as hand or self–resetting. Hand reset LEDs can be reset by either pressing
the TEST/RESET button, energising a suitably programmed binary input, or, by sending an appropriate
command over the data communications channel(s).
The status of hand reset LEDs is maintained by a back up storage capacitor in the event of an interruption to the
d.c. supply voltage.
Standard Keys
The relay is supplied as standard with five pushbuttons. The buttons are used to navigate the menu structure and
control relay functions. They are labelled:
Increases a setting or moves up menu.
Decreases a setting or moves down menu.
TEST/RESET
Moves right, can be used to reset selected functionality and for LED test (at
relay identifier screen).
ENTER
Used to initiate and accept settings changes.
CANCEL.
Used to cancel settings changes and/or move up the menu structure by one
level per press.
NOTE: All settings and configuration of LEDs, BI, BO and function keys can be accessed and set by the user
using these keys. Alternatively configuration/settings files can be loaded into the relay using ‘ReyDisp’.
2.6
Current Inputs
In total eight current inputs are provided on the Analogue Input modules. Terminals are available for both 1A and
5A inputs. CT ratios are input by the user in the CT/VT CONFIG menu.
Current is sampled at 1600Hz for 50Hz systems and 1920Hz for 60Hz systems (32 samples per cycle).
The waveform recorder samples and displays current input waveforms at 32 samples per cycle.
2.7
Voltage Input
An optional voltage input is provided on the Analogue Input module ‘A’.
VT ratios are input by the user in the CT/VT CONFIG menu.
Voltage is sampled at 1600Hz for 50Hz systems and 1920Hz for 60Hz systems (32 samples per cycle).
The waveform recorder displays the voltage input waveform at 32 samples per cycle.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 16 of 52
7SR242 Duobias Description Of Operation
2.8
Binary inputs
The binary inputs are opto-couplers operated from a suitably rated dc supply.
Relays are fitted with 9 or 19 binary inputs (BI). The user can assign any binary input to any of the available
functions (INPUT CONFIG > INPUT MATRIX).
The Power Supply module includes the relay basic I/O. The module includes 3 x BI.
Pick-up (PU) and drop-off (DO) time delays are associated with each binary input. Where no pick-up time delay
has been applied the input may pick up due to induced ac voltage on the wiring connections (e.g. cross site
wiring). The default pick-up time of 20ms provides ac immunity. Each input can be programmed independently.
Each input may be logically inverted to facilitate integration of the relay within the user scheme. When inverted the
relay indicates that the BI is energised when no d.c. is applied. Inversion occurs before the PU & DO time delay,
see fig. 2.8-1.
Each input may be mapped to any front Fascia indication LED and/or to any Binary output contact and can also
be used with the internal user programmable logic. This allows the relay to provide panel indications and alarms.
Inverted Inputs
BI 1 P/U Delay
BI 1 inverted
BI 1 D/O Delay
BI 1
Event
=1
Binary Input 1
INPUT
CONFIG>
BINARY
INPUT
CONFIG
INPUT CONFIG>
INPUT MATRIX
(Or gates)
BI n P/U Delay
BI n inverted
=1
BI n D/O Delay
BI n
Event
Binary Input n
Logic signals,
e.g. '51-1 Inhibit'
Figure 2-2
Binary Input Logic
©2010 Siemens Protection Devices Limited
Chapter 1 Page 17 of 52
7SR242 Duobias Description Of Operation
2.9
Binary outputs (Output Relays)
Relays are fitted with 6 or 14 binary outputs. All outputs are fully user configurable and can be programmed to
operate from any or all of the available functions.
The Power Supply module includes the relay basic I/O. The module includes six binary outputs each fitted with 1
contact – providing in total 1 x normally closed (NC), 2 x change-over (CO) and 3 x normally open (NO) contacts.
In the default mode of operation binary outputs are self reset and remain energised for a user configurable
minimum time of up to 60 seconds. If required, outputs can be programmed to operate as ‘hand reset’ or ‘pulsed’.
Where an output is programmed to be ‘hand reset’ and ‘pulsed’ then the output will be ‘hand reset’ only.
The binary outputs can be used to operate the trip coils of the circuit breaker directly where the trip coil current
does not exceed the 'make and carry' contact rating. The circuit breaker auxiliary contacts or other in-series
auxiliary device must be used to break the trip coil current.
CB1 and CB2 ‘Trip Contacts’ are assigned in the OUTPUT CONFIG>BINARY OUTPUT CONFIG menu.
Operation of a ‘Trip Contact’ will actuate the ‘Trip Alert’ screen where enabled and will initiate both fault record
storage and CB Fail protection where enabled.
When the relay is withdrawn from the case all normally closed contacts will be open circuited. This should be
considered in the design of the control and protection circuitry.
Notes on Self Reset Outputs
Outputs reset after the initiate condition is removed, they are subject to the user definable ‘Minimum Operate
Time’ setting.
With a failed breaker condition the relay may remain operated until current flow in the primary system is
interrupted by an upstream device. The relay will then reset and attempt to interrupt trip coil current flowing
through an output contact. Where this level is above the break rating of the output contact an auxiliary relay with
heavy-duty contacts should be utilised.
Notes on Pulsed Outputs
When operated, the output will reset after the user definable ‘Minimum Operate Time’ setting regardless of the
initiating condition.
Notes on Hand Reset Outputs
Hand reset outputs can be reset by either pressing the TEST/RESET button, by energising a suitably
programmed binary input, or, by sending an appropriate command over the data communications channel(s).
On loss of the auxiliary supply hand-reset outputs will reset. When the auxiliary supply is re-established the binary
output will remain in the reset state unless the initiating condition is still present.
Binary Output Test
The MAINTENANCE>OUTPUT MATRIX TEST menu includes a facility to test output relays from the relay fascia
without the need for a secondary injection test set.
Binary outputs can also be energised from the Reydisp Evolution software package where PC facilities are
available.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 18 of 52
7SR242 Duobias Description Of Operation
Logic signals,
e.g. '51-1'
Reset LEDs & Outputs (TEST/RESET key, Binary Input, Data Comms)
BO 1
S
R
Hand Reset
Output 1
Q
Event
&
&
BO 1 hand reset
1
Min Operate Time
OUTPUT CONFIG>
OUTPUT MATRIX
&
1
(Or gates)
OUTPUT
CONFIG>
BINARY
OUTPUT
CONFIG
OUTPUT
CONFIG>
BINARY
OUTPUT
CONFIG
BO n
Output n
S
R
1
1
Figure 2-3
Event
&
&
BO n hand reset
Q
&
Binary Output Logic
2.10 Virtual Input/Outputs
The relays have 16 virtual input/outputs, these are internal logic states. Virtual I/O is assigned in the same way as
physical Binary Inputs and Binary Outputs. Virtual I/O is mapped from within the INPUT CONFIG > INPUT
MATRIX and OUTPUT CONFIG > OUTPUT MATRIX menus.
The status of virtual I/O is not stored during power loss.
2.11 Self Monitoring
The relay incorporates a number of self-monitoring features. Each of these features can initiate a controlled reset
recovery sequence.
Supervision includes a power supply watchdog, code execution watchdog, memory checks by checksum and
processor/ADC health checks. When all checks indicate the relay is operating correctly the ‘Protection Healthy’
LED is illuminated.
If an internal failure is detected, a message will be displayed, also an event will be generated and stored. The
relay will reset in an attempt to rectify the failure. This will result in de-energisation of any binary output mapped to
‘protection healthy’ and flashing of the protection healthy LED. If a successful reset is achieved by the relay the
LED and output contact will revert back to normal operational mode, and the relay will restart.
2.11.1 Protection Healthy/Defective
A normally open contact can be used to signal protection healthy. When the relay has DC supply and it has
successfully passed its self-checking procedure then the Protection Healthy contacts are made.
A normally closed contact is used to signal protection defective. When the DC supply is not applied to the relay or
a problem is detected within the relay then this output is de-energised and the normally closed contacts make to
provide an external alarm.
An alarm can be provided if the relay is withdrawn from the case. A contact is provided in the case at positions
25-26 of the PSU module, this contact closes when the relay is withdrawn.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 19 of 52
7SR242 Duobias Description Of Operation
Section 3: Protection Functions
3.1
Current Protection: Differential Protection
Comprises both biased differential and high-set differential elements.
The fundamental frequency current is measured with the line CT inputs. These line currents are both multiplied
and vector corrected before being applied to the current differential elements.
3.1.1 ICT
The Wn ICT Multiplier setting is applied to the line currents – the CT secondary currents. The multiplier is used
to correct any CT ratio mismatch so that ideally nominal current (ICTOUT = 1A) is applied to the biased differential
algorithm.
The Wn ICT Connection setting applies the correct vector compensation to the current applied to the differential
algorithm.
The nominal current ratio of the virtual interposing CT is 1:1. Note that where Yd settings are applied some
current distributions will result in a 3 multiplying factor being applied. See ‘Applications Guide’.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 20 of 52
7SR242 Duobias Description Of Operation
3.1.2 Overall Biased Differential (87BD)
IW1
IW2
IW1 IW2
2nd Bias
Slope Type
st
D1
87B
87BD Initial
Setting
S
Bias
lope
Bias (Restraint) Current
IW1 IW2
2
1st Bias
Slope
Limit
Figure 3-1 Biased Differential Characteristic
Figure 3.1-1 illustrates the biased differential characteristic. Within the relay the fundamental frequency RMS line
currents are modified by the ICT Multiplier and ICT Connection settings (see 3.1.1) before being applied to the
biased differential elements. The biased differential elements calculate the operate current for each phase from
the vector sum of winding 1 and winding 2 currents i.e. IOPERATE = IW1 + IW2. The bias (or restraint) current is
calculated from the total current of winding 1 and winding 2 currents i.e.
IRESTRAIN
I W1 I W2
2
.
The 87BD Initial setting defines the minimum differential current required to operate the relay.
The 87BD 1st Bias Slope setting is used to ensure protection stability in the presence of steady state errors e.g.
the effects of an on-load tap changer.
The 87BD 1st Bias Slope Limit setting defines the border between the 1st and 2nd bias slopes.
87BD 2nd Bias Slope Type setting allows the user to select the preferred characteristic shape i.e. Line or Curve.
The 87BD 2nd Bias Slope setting is applied when 87BD 2nd Bias Slope Type = Line. This setting is used to
modify the sensitivity of the differential algorithm at higher current levels.
The output of 87BD Delay can be mapped to relay outputs.
Operation of the biased differential elements can be inhibited from:
Inhibit 87BD
A binary or virtual input.
87BD Inrush Action: Inhibit
Operation of the inrush current detector
87BD Overfluxing Action: Inhibit Operation of the overfluxing detector
©2010 Siemens Protection Devices Limited
Chapter 1 Page 21 of 52
7SR242 Duobias Description Of Operation
87BD Element
87BD Initial
Disabled
87BD 1st Bias Slope
Enabled
87BD 1st Bias Slope Limit
87BD 2nd Bias Slope Type
&
87BD 2nd Bias Slope
Inhibit 87BD
c
87BD ‘A’
Inhibit c
ICT
A
W1 ICT Multiplier
Pickup
1
trip
W1 ICT Connection
87BD ‘B’
Inhibit c
W1-IL1
B
W1-IL2
Pickup
trip
W1-IL3
87BD ‘C’
Inhibit c
C
87BD Delay
Pickup
87BD
1
trip
ICT
General Pickup
W2 ICT Multiplier
W2 ICT Connection
W2-IL1
W2-IL2
W2-IL3
87BD Inrush Action
81HBL2 Element
81HBL2 Setting
Disabled
81HBL2 Bias
Enabled
c
>
>
>
Wn-IL1
Wn-IL2
Wn-IL3
81HBL5 Setting
Disabled
81HBL5 Bias
Enabled
c
Wn-IL2
Wn-IL3
Inhibit
L1 81HBL2
&
87BD ‘A’ Inhibit
L2 81HBL2
&
87BD ‘B’ Inhibit
L3 81HBL2
&
87BD ‘C’ Inhibit
L1 81HBL5
&
87BD ‘A’ Inhibit
L2 81HBL5
&
87BD ‘B’ Inhibit
L3 81HBL5
&
87BD ‘C’ Inhibit
87BD Overfluxing Action
81HBL5 Element
Wn-IL1
Off
>
>
>
Off
Inhibit
Figure 3-2 Functional Diagram for Biased Current Differential Protection
©2010 Siemens Protection Devices Limited
Chapter 1 Page 22 of 52
7SR242 Duobias Description Of Operation
3.1.3 87HS
IW1 IW2
IW1 IW2
2
Figure 3-3 Differential Highset Characteristic
Figure 3.1-3 illustrates the differential highset characteristic. Within the relay the fundamental frequency RMS line
currents are modified by the ICT Multiplier and ICT Connection settings (see 3.1.1) before being applied to the
differential highset elements. The differential highset elements calculate the operate current for each phase from
the vector sum of winding 1 and winding 2 currents i.e. IOPERATE = IW1 + IW2.
87HS Setting defines the differential current required to operate the element. The output of 87HS Delay can be
mapped to relay outputs.
Operation of the highset differential elements can be inhibited from:
Inhibit 87HS
A binary or virtual input.
87HS Inrush Action: Inhibit
Operation of the inrush current detector
87HS Overfluxing Action: Inhibit Operation of the overfluxing detector
©2010 Siemens Protection Devices Limited
Chapter 1 Page 23 of 52
7SR242 Duobias Description Of Operation
87HS Element
Disabled
Enabled
&
87HS Setting
Inhibit 87HS
c
87HS ‘A’
c
Inhibit
ICT
Pickup
trip
W1 ICT Multiplier
87HS ‘B’
c
Inhibit
W1 ICT Connection
W1-IL1
&
Pickup
trip
W1-IL2
W1-IL3
General Pickup
87HS ‘C’
c
Inhibit
87HS Delay
Pickup
&
87HS
trip
ICT
W2 ICT Multiplier
W2 ICT Connection
W2-IL1
W2-IL2
W2-IL3
87HS Inrush Action
81HBL2 Element
81HBL2 Setting
Disabled
81HBL2 Bias
Enabled
c
>
>
>
Wn-IL1
Wn-IL2
Wn-IL3
81HBL5 Setting
Disabled
81HBL5 Bias
Enabled
c
Wn-IL2
Wn-IL3
Inhibit
L1 81HBL2
&
87HS ‘A’ Inhibit
L2 81HBL2
&
87HS ‘B’ Inhibit
L3 81HBL2
&
87HS ‘C’ Inhibit
L1 81HBL5
&
87HS ‘A’ Inhibit
L2 81HBL5
&
87HS ‘B’ Inhibit
L3 81HBL5
&
87HS ‘C’ Inhibit
87HS Overfluxing Action
81HBL5 Element
Wn-IL1
Off
>
>
>
Off
Inhibit
Figure 3-4 Logic Diagram: High Set Current Differential Protection
©2010 Siemens Protection Devices Limited
Chapter 1 Page 24 of 52
7SR242 Duobias Description Of Operation
3.2
Current Protection: Phase Overcurrent (51, 50)
The optional phase overcurrent elements have a common setting to measure either fundamental frequency RMS
or True RMS current:
True RMS current: 51/50 Measurement = RMS
Fundamental Frequency RMS current: 51/50 Measurement = Fundamental
3.2.1 Instantaneous Overcurrent Protection (50)
Optionally two instantaneous overcurrent elements are provided, each can be selected to either winding 1 or
winding 2.
Each instantaneous element (50-n) has independent settings. 50-n Setting for pick-up current and 50-n Delay
follower time delay. The instantaneous elements have transient free operation.
Operation of the instantaneous overcurrent elements can be inhibited from:
Inhibit 50-n
A binary or virtual input.
50-n Inrush Action: Inhibit
Operation of the inrush detector function.
50-n
Disabled
Enabled
&
Inhibit 50-n
50-n Setting
1
c
50-n Inrush
Action
L1 81HBL2
&
General Pickup
50-n Delay
c
>
Off
Inhibit
L2 81HBL2
L3 81HBL2
&
&
c
c
>
1
50-n
>
50/51
Measurement
Wn-IL1
Wn-IL2
Wn-IL3
Figure 3-5
Logic Diagram: Instantaneous Over-current Element
©2010 Siemens Protection Devices Limited
Chapter 1 Page 25 of 52
7SR242 Duobias Description Of Operation
3.2.2 Time Delayed Overcurrent Protection (51)
Optionally two time delayed overcurrent elements are provided, each can be selected to either winding 1 or
winding 2.
51-n Setting sets the pick-up current level.
A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is
selected from IEC, ANSI or user defined curves using 51-n Char. A time multiplier is applied to the characteristic
curves using the 51-n Time Mult setting. Alternatively, a definite time lag delay (DTL) can be chosen using 51-n
Char. When Delay (DTL) is selected the time multiplier is not applied and the 51-n Delay (DTL) setting is used
instead. The full list of operating curves is given in section 2 – ‘Settings, Configuration and Instruments Guide’.
Operating curve characteristics are illustrated in section 3 – ‘Performance Specification’.
The 51-n Reset setting can apply a definite time delayed reset, or when configured as an ANSI characteristic an
ANSI (DECAYING) reset. If ANSI (DECAYING) reset is selected for an IEC characteristic, the reset will be
instantaneous. The reset mode is significant where the characteristic has reset before issuing a trip output – see
‘Applications Guide’.
A minimum operate time for the characteristic can be set using 51-n Min. Operate Time setting.
A fixed additional operate time can be added to the characteristic using 51-n Follower DTL setting.
Operation of the time delayed overcurrent elements can be inhibited from:
Inhibit 51-n
A binary or virtual input.
51-n Inrush Action: Inhibit
Operation of the inrush detector function.
51-n Setting
51-n Char
51-n Element
51-n Time Mult
Disabled
51-n Delay (DTL)
Enabled
51-n Min. Operate Time
&
Inhibit 51-n
51-n Follower DTL
51-n Reset
c
51-n Inrush
Action
L1 81HBL2
&
c
Pickup
trip
Off
Inhibit
L2 81HBL2
&
c
1
General Pickup
Pickup
trip
L3 81HBL2
&
c
Pickup
1
51-n
trip
50/51
Measurement
Wn-IL1
Wn-IL2
Wn-IL3
Figure 3-6
Logic Diagram: Time Delayed Overcurrent Element
©2010 Siemens Protection Devices Limited
Chapter 1 Page 26 of 52
7SR242 Duobias Description Of Operation
3.3
Current Protection: Derived Earth Fault (50N, 51N)
The earth current is derived by calculating the sum of the measured line currents. These optional elements utilise
RMS current values of the fundamental frequency (50 or 60Hz).
3.3.1 Instantaneous Derived Earth Fault Protection (50N)
Optionally two instantaneous derived earth fault elements are provided, each can be selected to either winding 1
or winding 2.
Each instantaneous element has independent settings for pick-up current 50N-n Setting and a follower time
delay 50N-n Delay. The instantaneous elements have transient free operation.
Operation of the instantaneous earth fault elements can be inhibited from:
Inhibit 50N-nt
A binary or virtual input.
50N-n Inrush Action: Inhibit
Operation of the inrush detector function.
Figure 3-7
Logic Diagram: Instantaneous Derived Earth Fault Element
©2010 Siemens Protection Devices Limited
Chapter 1 Page 27 of 52
7SR242 Duobias Description Of Operation
3.3.2 Time Delayed Derived Earth Fault Protection (51N)
Optionally two time delayed derived earth fault elements are provided, each can be selected to either winding 1 or
winding 2.
51N-n Setting sets the pick-up current level.
A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is
selected from IEC, ANSI or user defined curves using 51N-n Char. A time multiplier is applied to the
characteristic curves using the 51N-n Time Mult setting. Alternatively, a definite time lag delay (DTL) can be
chosen using 51N-n Char. When Delay (DTL) is selected the time multiplier is not applied and the 51N-n Delay
(DTL) setting is used instead.
The 51N-n Reset setting can apply a definite time delayed or ANSI (DECAYING) reset. The reset mode is
significant where the characteristic has reset before issuing a trip output – see ‘Applications Guide’.
A minimum operate time for the characteristic can be set using the 51N-n Min. Operate Time setting.
A fixed additional operate time can be added to the characteristic using the 51N-n Follower DTL setting.
Operation of the time delayed earth fault elements can be inhibited from:
Inhibit 51N-n
A binary or virtual input.
51N-n Inrush Action: Inhibit
Operation of the inrush detector function.
51N-n Element
51N-n Setting
Disabled
51N-n Charact
Enabled
51N-n Time Mult
&
51N-n Delay (DTL)
Inhibit 51N-n
51N-n Min Operate Time
51N-n Follower DTL
51N-n Inrush
Action
51N-n Reset
Off
c
Inhibit
&
c
Pickup
General Pickup
81HBL2
trip
Wn-IL1
Wn-IL2
51N-n
IN
Wn-IL3
Figure 3-8
Logic Diagram: Derived Time Delayed Earth Fault Protection
©2010 Siemens Protection Devices Limited
Chapter 1 Page 28 of 52
7SR242 Duobias Description Of Operation
3.4
Current Protection: Measured Earth Fault (50G, 51G)
The earth current is measured directly via dedicated current analogue inputs. These optional elements utilise
either RMS or Fundamental current values as defined by the 51G/50G Measurement setting (MEASURED E/F
menu).
3.4.1 Instantaneous Measured Earth Fault Protection (50G)
Optionally two instantaneous measured earth fault elements are provided, each can be selected to either winding
1 or winding 2.
Each instantaneous element has independent settings for pick-up current 50G-n Setting and a follower time
delay 50G-n Delay. The instantaneous elements have transient free operation.
Operation of the instantaneous measured earth fault elements can be inhibited from:
Inhibit 50G-n
A binary or virtual input.
50G-n Inrush Action: Inhibit
Operation of the inrush detector function.
Figure 3-9
Logic Diagram: Measured Instantaneous Earth-fault Element
©2010 Siemens Protection Devices Limited
Chapter 1 Page 29 of 52
7SR242 Duobias Description Of Operation
3.4.2 Time Delayed Measured Earth Fault Protection (51G)
Optionally two time delayed measured earth fault elements are provided, each can be selected to either winding 1
or winding 2.
51G-n Setting sets the pick-up current level.
A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is
selected from IEC, ANSI or user defined curves using 51G-n Char. A time multiplier is applied to the
characteristic curves using the 51G-n Time Mult setting. Alternatively, a definite time lag (DTL) can be chosen
using 51G-n Char. When DTL is selected the time multiplier is not applied and the 51G-n Delay (DTL) setting is
used instead.
The 51G-n Reset setting can apply a definite time delayed or ANSI (DECAYING) reset. The reset mode is
significant where the characteristic has reset before issuing a trip output – see ‘Applications Guide’.
A minimum operate time for the characteristic can be set using 51G-n Min. Operate Time setting.
A fixed additional operate time can be added to the characteristic using 51G-n Follower DTL setting.
Operation of the time delayed measured earth fault elements can be inhibited from:
Inhibit 51G-n
A binary or virtual input.
51G-n Inrush Action: Inhibit
Operation of the inrush detector function.
51G-n Element
Disabled
Enabled
&
Inhibit 51G-n
51G-n Setting
51G-n Charact
51G-n Inrush
Action
51G-n Time Mult
51G-n Delay (DTL)
Off
51G-n Min Operate Time
Inhibit
&
81HBL2
51G-n Follower DTL
51G-n Reset
c
51G/50G Measurement
c
IGn
Figure 3-10
Pickup
trip
General Pickup
51G-n
Logic Diagram: Time Delayed Measured Earth Fault Element (51G)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 30 of 52
7SR242 Duobias Description Of Operation
3.5
Current Protection: High Impedance Restricted Earth
Fault (64H)
Two high impedance restricted earth fault elements are provided, one for each transformer winding
The relay utilises fundamental current measurement values for this function.
The single phase current input is derived from the residual output of line/neutral CTs connected in parallel. An
external stabilising resistor must be connected in series with this input to ensure that this element provides a high
impedance path.
64H Current Setting sets the pick-up current level. An output is given after elapse of the 64H Delay setting.
An external series stabilising resistor and a parallel connected voltage limiting non-linear resistor are used with
this function. See ‘Applications Guide’ for advice in specifying suitable component values.
Operation of the high impedance element can be inhibited from:
Inhibit 64H
A binary or virtual input.
64H Element
Disabled
64H Current Setting
Enabled
64H Delay
&
c
>
Inhibit 64H
64H
IG
Figure 3-11 Logic Diagram: High Impedance REF (64H)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 31 of 52
7SR242 Duobias Description Of Operation
3.6
Open Circuit (46BC)
Optionally two open circuit elements are provided, each can be selected to either winding 1 or winding 2.
The element calculates the ratio of NPS to PPS currents. Where the NPS:PPS current ratio is above 46BC
Setting an output is given after the 46BC Delay.
The Open Circuit function can be inhibited from
Inhibit 46BC
A binary or virtual input .
Gn 46BC-n U/I Guarded Operation of the undercurrent guard function.
46BC Element
Enabled
Disabled
Inhibit 46BC
46BC-n U/I
Guarded
46BC Setting
Yes
46BC-n U/I
Guard Setting
<
<
<
&
c
&
46BC Delay
&
46BC
IL1
IL2
NPS
Filter
I2
PPS
Filter
I1
IL3
Figure 3-12
Logic Diagram: Open Circuit Function (46BC)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 32 of 52
7SR242 Duobias Description Of Operation
3.7
Current Protection: Negative Phase Sequence
Overcurrent (46NPS)
Optionally four NPS current elements are provided – 2 x 46IT and 2 x 46DT. Each element can be selected to
either winding 1 or winding 2.
The 46IT elements can be configured to be either definite time lag (DTL) or inverse definite minimum time (IDMT),
46IT Setting sets the pick-up current level for the element.
A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is
selected from IEC and ANSI curves using 46IT Char. A time multiplier is applied to the characteristic curves using
the 46IT Time Mult setting. Alternatively, a definite time lag delay (DTL) can be chosen using 46ITChar. When
Delay (DTL) is selected the time multiplier is not applied and the 46IT Delay (DTL) setting is used instead.
The 46IT Reset setting can apply a, definite time delayed or ANSI (DECAYING) reset.
The 46DT elements have a DTL characteristic. 46DT Setting sets the pick-up current and 46DT Delay the
follower time delay.
Operation of the negative phase sequence overcurrent elements can be inhibited from:
Inhibit 46IT
A binary or virtual input.
Inhibit 46DT
A binary or virtual input.
46IT Setting
46IT Char
46IT Time Mult
46IT-n Element
46IT Delay (DTL)
Disabled
46IT Reset
Enabled
&
c
General Pickup
Pickup
Inhibit 46IT-n
46IT-n
trip
Wn-IL1
Wn-IL2
NPS
I2
Wn-IL3
General Pickup
46DT-n Element
46DT Setting
46DT-n Delay
Disabled
>
Enabled
&
46DT-n
c
Inhibit 46DT-n
Figure 3-13
Logic Diagram: Negative Phase Sequence Overcurrent (46NPS)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 33 of 52
7SR242 Duobias Description Of Operation
3.8
Current Protection: Under-Current (37, 37G)
Optionally two under-current elements are provided for both line and measured earth current, each can be
selected to either winding 1 or winding 2.
Each phase has an independent level detector and current-timing element. 37-n Setting sets the pick-up current.
An output is given after elapse of the 37-n Delay setting.
Operation of the under-current elements can be inhibited from:
Inhibit 37-n
A binary or virtual input.
Gn 37-n U/I Guarded
Operation of the undercurrent guard function.
Inhibit 37G-n
A binary or virtual input.
37-n Element
Disabled
Enabled
Inhibit 37-n
37-n U/I
Guarded
Yes
37-n U/I Guard
Setting
&
<
<
&
37-n Setting
1
37-n Delay
c
<
Wn IL1
<
Wn IL2
<
Wn IL3
<
1
37-n
37G-n Element
Disabled
37G-n Setting
Enabled
&
c
37G-n Delay
Inhibit 37G-n
Ig-n
Figure 3-14
<
37G-n
Logic Diagram: Undercurrent Detector (37, 37G)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 34 of 52
7SR242 Duobias Description Of Operation
3.9
Current Protection: Thermal Overload (49)
Optionally a phase segregated thermal overload element is provided, this can be selected to either winding 1 or
winding 2. The thermal state is calculated using the measured True RMS current.
Should the current rise above the 49 Overload Setting for a defined time an output signal will be initiated.
Operate Time (t):-
­ I2 IP2
½
t W u ln ® 2
2 ¾
u
I
k
I
B
¯
¿
Where
T = Time in minutes
W = 49 Time Constant setting (minutes)
In = Log Natural
I = measured current
IP = Previous steady state current level
k = Constant
IB = Basic current, typically the same as In
k.IB = 49 Overload Setting (IT)
Additionally, an alarm can be given if the thermal state of the system exceeds a specified percentage of the
protected equipment’s thermal capacity 49 Capacity Alarm setting.
For the heating curve:
I2
I
2
˜ (1 e
t
) u 100%
Where: T = thermal state at time t
I = measured thermal current
IT = 49 Overload setting (or k.IB)
The final steady state thermal condition can be predicted for any steady state value of input current where t >W,
F
I2
I2
u 100%
Where: TF = final thermal state before disconnection of device
49 Overload Setting IT is expressed as a multiple of the relay nominal current and is equivalent to the factor k.IB
as defined in the IEC255-8 thermal operating characteristics. It is the value of current above which 100% of
thermal capacity will be reached after a period of time and it is therefore normally set slightly above the full load
current of the protected device.
The thermal state may be reset from the fascia or externally via a binary input.
Thermal overload protection can be inhibited from:
Inhibit 49
A binary or virtual input.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 35 of 52
7SR242 Duobias Description Of Operation
49 Thermal
Overload
Disabled
49 Overload Setting
49 Time Constant
49 Capacity Alarm
Enabled
&
c
Inhibit 49
cap alarm
Wn-IL1
trip
1
49 Alarm
1
49 Trip
cap alarm
Wn-IL2
trip
cap alarm
Wn-IL3
Figure 3-15
trip
Logic Diagram: Thermal Overload Protection (49)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 36 of 52
7SR242 Duobias Description Of Operation
3.10 Voltage Protection: Over Fluxing (24)
Optionally, three over fluxing elements are provided – 2 x 24DT and 1 x 24IT Char elements.
The 24DT Elements have a DTL characteristic. 24DT Setting sets the pick-up level and 24DT Delay the follower
time delay. An output is given if the Volts/Hertz ratio is above setting for the duration of the delay. The 24DT-n
Hysteresis setting allows the user to vary the pick-up/drop-off ratio for the element.
The 24IT Element has a user definable shape.
24Xn Point Setting sets the over fluxing (V/f) level for up to 7 user definable points.
24Yn Point Setting sets the operate time for each of the defined points.
The 24IT Reset setting can apply a, definite time delayed reset.
Y0
X0, Y0 point
defines
curve pick-up
X
X
Straight-line
between points
X
X
X6, Y6 point
defines
curve cut-off
X
X
Y6
X0
X
X6
X - (V/f)
Figure 3-16 Inverse Over-fluxing Characteristic (24IT)
Operation of the over fluxing elements can be inhibited from:
Inhibit 24IT
A binary or virtual input.
Inhibit 24DT-n
A binary or virtual input.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 37 of 52
7SR242 Duobias Description Of Operation
Figure 3-17 Logic Diagram: Overfluxing Elements (24)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 38 of 52
7SR242 Duobias Description Of Operation
3.11 Voltage Protection: Under/Over Voltage (27/59)
Optionally four under/over voltage elements are provided.
The relay utilises fundamental voltage measurement values for this function.
27/59-n Setting sets the pick-up voltage level for the element.
The sense of the element (undervoltage or overvoltage) is set by the 27/59-n Operation setting.
Voltage elements are blocked if the measured voltage falls below the 27/59 U/V Guard setting.
An output is given after elapse of the 27/59-n Delay setting.
The 27/59-n Hysteresis setting allows the user to vary the pick-up/drop-off ratio for the element.
Operation of the under/over voltage elements can be inhibited from:
Inhibit 27/59-n
A binary or virtual input.
27/59-n U/V Guarded
Under voltage guard element.
27/59-n Element
Disabled
Enabled
Inhibit 27/59-n
27/59-n U/V
Guarded
27/59-n Operation
Yes
27/59-n Setting
27/59 U/V Guard
Setting
&
&
c
<
27/59-n Delay
> or <
V
Figure 3-18
General Pickup
27/59-n Hysteresis
27/59-n
Logic Diagram: Under/Over Voltage Elements (27/59)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 39 of 52
7SR242 Duobias Description Of Operation
3.12 Voltage Protection: Neutral Overvoltage (59N)
Optionally two Neutral Overvoltage (or Neutral Voltage Displacement) elements are provided.
One of the elements can be configured to be either definite time lag (DTL) or inverse definite minimum time
(IDMT),
59NIT Setting sets the pick-up voltage level (3V0) for the element.
An inverse definite minimum time (IDMT) can be selected using 59NIT Char. A time multiplier is applied to the
characteristic curves using the 59NIT Time Mult setting (M):
t op
ª M º
« 3Vo
»
¬ > Vs @ 1¼
Alternatively, a definite time lag delay (DTL) can be chosen using 59NITChar. When Delay (DTL) is selected the
time multiplier is not applied and the 59NIT Delay (DTL) setting is used instead.
An instantaneous or definite time delayed reset can be applied using the 59NIT Reset setting.
The second element has a DTL characteristic. 59NDT Setting sets the pick-up voltage (3V0) and 59NDT Delay
the follower time delay.
Operation of the neutral overvoltage elements can be inhibited from:
Inhibit 59NIT
A binary or virtual input.
Inhibit59NDT
A binary or virtual input.
It should be noted that neutral voltage displacement can only be applied to VT arrangements that allow zero
sequence flux to flow in the core i.e. a 5-limb VT or 3 single phase VTs. The VT primary winding neutral must be
earthed to allow the flow of zero sequence current.
Figure 3-19
Logic Diagram: Neutral Overvoltage Element
©2010 Siemens Protection Devices Limited
Chapter 1 Page 40 of 52
7SR242 Duobias Description Of Operation
3.13 Voltage Protection: Under/Over Frequency (81)
Optionally six under/over frequency elements are provided.
Frequency elements are blocked if the measured voltage falls below the 81 U/V Guard setting.
The sense of the element (under-frequency or over-frequency) is set by the 81-n Operation setting.
81-n Setting sets the pick-up frequency for the element.
An output is given after elapse of the 81-n Delay setting.
The 81-n Hysteresis setting allows the user to vary the pick-up/drop-off ratio for the element.
Operation of the under/over frequency elements can be inhibited from:
Inhibit 81-n
A binary or virtual input.
81-n U/V Guarded
Under voltage guard element.
Figure 3-20
Logic Diagram: Under/Over Frequency Detector (81)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 41 of 52
7SR242 Duobias Description Of Operation
Section 4: Control & Logic Functions
4.1
Quick Logic
The ‘Quick Logic’ feature allows the user to input up to 16 logic equations (E1 to E16) in text format. Equations
can be entered using Reydisp or at the relay fascia.
Each logic equation is built up from text representing control characters. Each can be up to 20 characters long.
Allowable characters are:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Digit
( )
Parenthesis
!
‘NOT’ Function
.
‘AND’ Function
^
‘EXCLUSIVE OR’ Function
+
‘OR’ Function
En
Equation (number)
Fn
Function Key (number)
‘1’ = Key pressed, ‘0’ = Key not pressed
In
Binary Input (number)
‘1’ = Input energised, ‘0’ = Input de-energised
Ln
LED (number)
‘1’ = LED energised, ‘0’ = LED de-energised
On
Binary output (number)
‘1’ = Output energised, ‘0’ = Output de-energised
Vn
Virtual Input/Output (number)
‘1’ = Virtual I/O energised, ‘0’ = Virtual I/O de-energised
Example Showing Use of Nomenclature
E1= ((I1^F1).!O2)+L1
Equation 1 = ((Binary Input 1 XOR Function Key 1) AND NOT Binary Output 2)
OR
LED 1
When the equation is satisfied (=1) it is routed through a pick-up timer (En Pickup Delay), a drop-off timer (En
Dropoff Delay), and a counter which instantaneously picks up and increments towards its target (En Counter
Target).
The counter will either maintain its count value En Counter Reset Mode = OFF, or reset after a time delay:
En Counter Reset Mode = Single Shot: The En Counter Reset Time is started only when the counter
is first incremented (i.e. counter value = 1) and not for subsequent counter operations. Where En
Counter Reset Time elapses and the count value has not reached its target the count value is reset to
zero.
En Counter Reset Mode = Multi Shot: The En Counter Reset Time is started each time the counter is
incremented. Where En Counter Reset Time elapses without further count increments the count value
is reset to zero.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 42 of 52
P.
U
.D
EL
A
Figure 4-1
AY
EL
.D
.O
D
Y
7SR242 Duobias Description Of Operation
Sequence Diagram showing PU/DO Timers in Quick Logic (Counter Reset Mode Off)
When the count value = En Counter Target the output of the counter (En) = 1 and this value is held until the
initiating conditions are removed when En is instantaneously reset.
The output of En is assigned in the OUTPUT CONFIG>OUTPUT MATRIX menu where it can be programmed to
any binary output (O), LED (L) or Virtual Input/Output (V) combination.
Protection functions can be used in Quick Logic by mapping them to a Virtual Input / Output.
Refer to Section 7 – Applications Guide for examples of Logic schemes.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 43 of 52
7SR242 Duobias Description Of Operation
Section 5: Supervision Functions
5.1
Circuit Breaker Failure (50BF)
Two CB Fail elements are provided – one element per winding.
Each circuit breaker fail function has two time delayed outputs that can be used for combinations of re-tripping or
back-tripping. CB Fail outputs are given after elapse of the 50BF-n-1 Delay or 50BF-n-2 Delay settings. The two
timers run concurrently.
The circuit breaker fail protection time delays are initiated either from:
An output Trip Contact of the relay (MENU: OUTPUT CONFIG\BINARY OUTPUT CONFIG\CBn Trip
Contacts), or
A binary or virtual input assigned to 50BF-n Ext Trip (MENU: INPUT CONFIG\INPUT MATRIX\50BF Ext
Trip).
A binary or virtual input assigned to 50BF-n Mech Trip (MENU: INPUT CONFIG\INPUT MATRIX\ 50BFn Mech Trip).
CB Fail outputs will be issued providing any of the 3 phase currents are above the 50BF-n Setting or the current
in the fourth CT is above 50BF-n-I4 for longer than the 50BF-n-n Delay setting, or for a mechanical protection trip
the circuit breaker is still closed when the 50BF-n-n Delay setting has expired – indicating that the fault has not
been cleared.
Both 50BF-n-1 and 50BF-n-2 can be mapped to any output contact or LED.
If the 50BF-n CB Faulty input (MENU: INPUT CONFIG\INPUT MATRIX\CB Faulty) is energised when a CB trip
is given the time delays 50BF-n-n Delay will be by-passed and the output given immediately.
Operation of the CB Fail elements can be inhibited from:
Inhibit 50BF-n
A binary or virtual input.
Figure 5-1 Logic Diagram: Circuit Breaker Fail Protection (50BF)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 44 of 52
7SR242 Duobias Description Of Operation
5.2
Trip/Close Circuit Supervision (74TCS/74CCS)
The relay provides six trip and six close circuit supervision elements, all elements are identical in operation and
independent from each other allowing 6 trip and 6 close circuits to be monitored.
One or more binary inputs can be mapped to 74TCS-n/74CCS-n. The inputs are connected into the trip circuit
such that at least one input is energised when the trip circuit wiring is intact. If all mapped inputs become deenergised, due to a break in the trip circuit wiring or loss of supply an output is given.
The 74TCS-n Delay or 74CCS-n Delay setting prevents failure being incorrectly indicated during circuit breaker
operation. This delay should be greater than the operating time of the circuit breaker.
The use of one or two binary inputs mapped to the same Circuit Supervision element (e.g. 74TCS-n) allows the
user to realise several alternative monitoring schemes – see ‘Applications Guide’.
Figure 5-2
Logic Diagram: Trip Circuit Supervision Feature (74TCS)
&
1
Figure 5-3
NOTE: Diagram shows two binary inputs mapped
to the same Close Circuit Supervision element
Logic Diagram: Close Circuit Supervision Feature (74CCS)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 45 of 52
7SR242 Duobias Description Of Operation
5.3
Inrush Detector (81HBL2)
Inrush detector elements monitor the line currents.
The inrush detector can be used to block the operation of selected elements during transformer magnetising
inrush conditions.
The 81HBL2 Bias setting allows the user to select between Phase, Sum and Cross methods of measurement:
Phase
Each phase is inhibited separately.
Sum
With this method the square root of the sum of the squares of the second harmonic in each
phase is compared to each operate current individually.
Cross
All phases are inhibited when any phase detects an inrush condition.
An output is given where the measured ratio of second harmonic to fundamental current component content is
above the 81HBL2 setting.
Figure 5-4
5.4
Logic Diagram: Inrush Detector Feature (81HBL2)
OverFluxing Detector (81HBL5)
Overfluxing detector elements monitor the line currents.
The over fluxing detector can be used to block the operation of differential protection (87BD/ 87HS) elements.
The 81HBL5 Bias setting allows the user to select between Phase, Sum and Cross methods of measurement:
Phase
Each phase is inhibited separately
Sum
The inrush current from each phase is summated and compared to each operate current
individually
Cross
All phases are inhibited when any phase detects an inrush condition
An output is given where the measured fifth harmonic component content is above the 81HBL5 setting.
>1
81HBL5 Element
81 HBL5
81HBL5 Setting
Disabled
81HBL5 Bias
Enabled
c
IL1
IL2
IL3
Figure 5-5
>
>
>
L1 81HBL5
L2 81HBL5
L3 81HBL5
Logic Diagram: Overfluxing Detector Feature (81HBL5)
©2010 Siemens Protection Devices Limited
Chapter 1 Page 46 of 52
7SR242 Duobias Description Of Operation
5.5
Demand
Maximum, minimum and mean values of line currents and voltage (where applicable) are available as instruments
which can be read in the relay INSTRUMENTS MENU or via Reydisp.
The DATA STORAGE > DEMAND DATA LOG > Data Log Period setting is used to define the time/duration
after which the instrument is updated. The updated value indicates the maximum, minimum and mean values for
the defined period.
The Gn Demand Window setting defines the maximum period of time over which the demand values are valid. A
new set of demand values is established after expiry of the set time.
The Gn Demand Window Type can be set to FIXED, PEAK or ROLLING.
When set to FIXED the maximum, minimum and mean values demand statistics are calculated over
fixed
Window
duration.
At
the
end
of
each
window
the
internal
statistics
are reset and a new window is started.
When set to PEAK the maximum and minimum values within the Demand Window time setting is
recorded.
When set to ROLLING the maximum, minimum and mean values demand statistics are calculated over
a moving Window duration. The internal statistics
are updated when the window advances every Updated Period.
The statistics can be reset from a binary input or communication command, after a reset the update period and
window are immediately restarted.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 47 of 52
7SR242 Duobias Description Of Operation
Section 6: Other Features
6.1
Data Communications
Two communication ports, COM1 and COM2 are provided. RS485 connections are available on the terminal
blocks at the rear of the relay (COM1). A USB port, COM 2, is provided at the front of the relay for local access
using a PC.
Optionally, two additional fibre optic communication ports with ST connectors can be provided at the rear of the
relay - COM3 and COM4.
Communication is compatible with Modbus-RTU, IEC60870-5-103 FT 1.2 and optionally DNP3.0 transmission
and application standards.
Communication with the relay from a personal computer (PC) is facilitated by the REYDISP EVOLUTION
software package. The program allows the transfer of relay settings, waveform records, event records, fault data
records, Instruments/meters and control functions. REYDISP EVOLUTION is compatible with IEC60870-5-103.
Data communications operation is described in detail in Section 4 of this manual.
6.2
Maintenance
6.2.1 Output Matrix Test
The feature is available from the Relay fascia and allows the user to operate binary outputs or LEDs assigned to
relay functions.
Any protection function which is enabled in the setting menu will appear in the Output Matrix Test.
6.2.2 CB Counters
Four CB trip counters are provided:
CB1 Total Trip Count:
Increments on each trip command issued.
CB1 Delta Trip Count:
Additional counter which can be reset independently of the
Total Trip Counter. This can be used, for example, for
recording trip operations between visits to a substation.
CB2 Total Trip Count
As CB1
CB2 Delta Trip Count:
As CB1
The status of each counter can be viewed in the INSTRUMENTS mode.
Binary outputs can be mapped to each of the above counters, these outputs are energised when the
user defined Count Target is reached.
6.2.3 I2t CB Wear
CB1 and CB2 wear counters are also provided:
I2t CB1 Wear:
©2010 Siemens Protection Devices Limited
Provides an estimate of contact wear and maintenance
requirements. The algorithm works on a per phase basis,
measuring the arcing current during faults. The I2t value at
the time of trip is added to the previously stored value and an
alarm is given when any one of the three phase running
counts exceeds the set Alarm limit . The t value is the time
between CB contacts separation when an arc is formed,
Separation Time, and the CB Clearance time.
Chapter 1 Page 48 of 52
7SR242 Duobias Description Of Operation
2
I t CB2 Wear:
As CB1
The status of each counter can be viewed in the INSTRUMENTS mode.
Binary outputs can be mapped to each of the above counters, these outputs are energised when the
user defined Alarm Limit is reached.
6.3
Data Storage
6.3.1 General
The relay stores three types of data: relay event records, analogue/digital waveform records and fault records.
Waveform records, fault records and event records are backed up in non-volatile memory and are permanently
stored even in the event of loss of auxiliary d.c. supply voltage.
6.3.2 Event Records
The event recorder feature allows the time tagging of any change of state (Event) in the relay. As an event
occurs, the actual event condition is logged as a record along with a time and date stamp to a resolution of 1
millisecond. There is capacity for a maximum of 5000 event records that can be stored in the relay and when the
event buffer is full any new record will over-write the oldest. Stored events can be erased using the DATA
STORAGE>Clear Events setting.
The following events are logged:
Change of state of Binary outputs.
Change of state of Binary inputs.
Change of Settings and Settings Group
Change of state of any of the control functions of the relay.
All events can be uploaded over the data communications channel(s) and can be displayed in the ‘ReyDisp
Evolution’ package in chronological order, allowing the sequence of events to be viewed. Events are also made
available spontaneously to an IEC 60870-5-103 or Modbus RTU compliant control system.
For a complete listing of events available in each model, refer to Technical Manual section 4 ‘Data Comms’.
6.3.3 Waveform Records.
Relay waveform storage can be triggered from:
x
User selected relay operations, this requires the relevant OUTPUT CONFIG>B.O.
CONFIG>Trip Contacts setting to be assigned.
x
The relay fascia.
x
A suitably programmed binary input.
x
The data comms channel(s).
Stored analogue and digital waveforms illustrate the system and relay conditions at the time of trigger.
In total the relay provides 10 seconds of waveform storage, this is user selectable to 1 x 10second, 2 x 5 second,
5 x 2 second or 10 x 1 second records. When the waveform recorder buffer is full any new waveform record will
over-write the oldest. The most recent record is Waveform 1.
As well as defining the stored waveform record duration the user can select the percentage of the waveform
storage prior to triggering.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 49 of 52
7SR242 Duobias Description Of Operation
Waveforms are sampled at a rate of 1600Hz.
Stored waveforms can be erased using the DATA STORAGE>Clear Waveforms setting.
6.3.4 Fault Records
Up to ten fault records can be stored and displayed on the Fascia LCD.
Fault records provide a summary of the relay status at the time of trip, i.e. the element that issued the trip, any
elements that were picked up, the fault type, LED indications, date and time. The Max Fault Rec. Time setting
sets the time period from fault trigger during which the operation of any LEDs is recorded.
To achieve accurate instrumentation values for the fault records when testing, ensure a drop off delay is applied
to the test set so that the injected quantities remain on for a short duration, typically 20ms, after the relay has
issued the trip output. This extended period of injection simulates the behaviour of the power system where
faulted conditions are present until CB operation.
Where examined together the event records and the fault records will detail the full sequence of events leading to
a trip.
Fault records are stored in a rolling buffer, with the oldest faults overwritten. The fault storage can be cleared with
the DATA STORAGE>Clear Faults setting.
The SYSTEM CONFIG > Trip Alert = Disabled setting allows the above to be switched off e.g. during
commissioning tests.
6.3.5 Demand/Data Log
The Data log feature can be used to build trend and demand records.
Up to 10,080 values for each phase current (W1 and W2) and voltage (where fitted) analogue are recorded. Each
recorded value consists of the mean value of the sampled data over the Data Log Period.
Stored Data Log records are retrieved using Reydisp.
6.4
Metering
The metering feature provides real-time data available from the relay fascia in the ‘Instruments Mode’ or via the
data communications interface.
For a detailed description refer to Technical Manual Section 2 – Settings and Instruments.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 50 of 52
7SR242 Duobias Description Of Operation
6.5
Operating Mode
The relay has three operating modes, Local, Remote and Out of Service.
functions operation in each mode.
The following table identifies the
The modes can be selected by the following methods:
SYSTEM CONFIG>RELAY MODE setting, a Binary Input or Command
Table 6-1 Operation Mode
OPERATION
Control
Rear Ports
Fascia (Control Mode)
USB
Binary Inputs
Binary Outputs
REMOTE MODE
LOCAL MODE
SERVICE MODE
Enabled
Disabled
Disabled
Setting Option
Enabled
Disabled
Enabled
Enabled
Setting Option
Enabled
Disabled
Disabled
Disabled
Enabled
Disabled
Reporting
Spontaneous
IEC
DNP
General Interogation
IEC
DNP
MODBUS
Enabled
Enabled
Enabled
Enabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Disabled
Disabled
Enabled
Changing of Settings
Rear Ports
Fascia
USB
Enabled
Enabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Enabled
Historical Information
Waveform Records
Event Records
Fault Information
Setting Information
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
6.6
Control Mode
This mode provides convenient access to commonly used relay control and test functions. When any of the items
listed in the control menu are selected control is initiated by pressing the ENTER key. The user is prompted to
confirm the action, again by pressing the ENTER key, before the command is executed.
Control Mode commands are password protected using the Control Password function – see Section 6.9.
6.7
Real Time Clock
The relay stores the time and date. The time and date are maintained while the relay is de-energised by a back
up storage capacitor.
The default date is set at 01/01/2000 deliberately to indicate the date has not yet been set. When editing the
Time, only the hours and minutes can be edited. When the user presses ENTER after editing the seconds are
zeroed and the clock begins running.
Time and date can be set either via the relay fascia using appropriate commands in the System Config menu or
via:
©2010 Siemens Protection Devices Limited
Chapter 1 Page 51 of 52
7SR242 Duobias Description Of Operation
6.7.1 Time Synchronisation – Data Comms
Where the data comms channel(s) is connected to a dedicated substation automation system the relay can be
time synchronised using the relevant command within IEC 60870-5-103 or optional DNP3.0 protocols. The time
can also be synchronised from ‘Reydisp Evolution’ which utilises the communications support software.
6.7.2 Time Synchronisation – Binary Input
A binary input can be mapped Clock Sync from BI. The seconds or minutes will be rounded up or down to the
nearest value when the BI is energised. This input is leading edge triggered.
6.7.3 Time Synchronisation – IRIG-B (Optional)
A BNC connector on the relay rear provides an isolated IRIG-B time synchronisation port. The IRIG-B input
expects a modulated 3-6 Volt signal and provides time synchronisation to the nearest millisecond.
6.8
Settings Groups
The relay provides eight groups of settings – Group number (Gn) 1 to 8. At any one time only one group of
settings can be ‘active’ – SYSTEM CONFIG>Active Group setting.
It is possible to edit one group while the relay operates in accordance with settings from another ‘active’ group
using the View/Edit Group setting.
Some settings are independent of the active group setting i.e. they apply to all settings groups. This is indicated
on the top line of the relay LCD – where only the Active Group No. is identified. Where settings are group
dependent this is indicated on the top line of the LCD by both the Active Group No. and the View Group No.
being displayed.
A change of settings group can be achieved either locally at the relay fascia, remotely over the data comms
channel(s) or via a binary input. When using a binary input an alternative settings group is selected only whilst the
input is energised (Select Grp Mode: Level triggered) or latches into the selected group after energisation of the
input (Select Grp Mode: Edge triggered).
6.9
Password Feature
The relay incorporates two levels of password protection – one for settings, the other for control functions.
The programmable password feature enables the user to enter a 4 character alpha numeric code to secure
access to the relay functions. The relay is supplied with the passwords set to NONE, i.e. the password feature is
disabled. The password must be entered twice as a security measure against accidental changes. Once a
password has been entered then it will be required thereafter to change settings or initiate control commands.
Passwords can be de-activated by using the password to gain access and by entering the password NONE.
Again this must be entered twice to de-activate the security system.
As soon as the user attempts to change a setting or initiate control the password is requested before any changes
are allowed. Once the password has been validated, the user is ‘logged on’ and any further changes can be
made without re-entering the password. If no more changes are made within 1 hour then the user will
automatically be ‘logged off’, re-enabling the password feature.
The Settings Password prevents unauthorised changes to settings from the front fascia or over the data comms
channel(s). The Control Password prevents unauthorised operation of controls in the relay Control Menu from the
front fascia.
The password validation screen also displays a numerical code. If the password is lost or forgotten, this code
should be communicated to Siemens Protection Devices Ltd. and the password can be retrieved.
©2010 Siemens Protection Devices Limited
Chapter 1 Page 52 of 52
7SR242 Duobias Settings, Configuration & Instruments Guide
7SR242 Duobias
Multi-Function 2-Winding Transformer Protection Relay
Document Release History
This document is issue 2010/02. The list of revisions up to and including this issue is:
2010/02
Document reformat due to rebrand
2010/02
Third issue. Software revision 2662H80001 R4c-3
2008/07
Second issue. Software revision 2662H80001R3d-2c.
2008/05
First issue
Software Revision History
2010/02
2662H80001 R4c-3
Revisions to: VT ratio settings, 87BD 1st bias slope limit setting
increments, CB fail function, LED CONFIG menu, DATA STORAGE
menu.
Added: Open circuit detection (46BC), CONTROL MODE menu,
Close circuit supervision (74CCS), Measured earth fault undercurrent
(37G), Pulsed output contacts.
2008/07
2662H80001R3d-2c.
Demand metering. Optional DNP3.0 data comms.
2008/05
2662H80001R3-2b
First Release
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Settings, Configuration & Instruments Guide
Contents
Document Release History....................................................................................................................1
Software Revision History.....................................................................................................................1
Contents ..................................................................................................................................................2
Section 1: Introduction ..........................................................................................................................4
1.1 Relay Menus And Display.........................................................................................................4
1.2 Operation Guide........................................................................................................................6
1.2.1 User Interface Operation..............................................................................................6
1.3 Settings Display ........................................................................................................................8
1.4 Instruments Mode .....................................................................................................................8
1.5 Fault Data Mode .....................................................................................................................16
Section 2: Setting the Relay Using Reydisp Evolution ....................................................................17
2.1 Physical Connection ...............................................................................................................17
2.1.1 Front USB connection ................................................................................................17
2.1.2 Rear RS485 connection .............................................................................................18
2.1.3 Optional rear fibre optic connection ...........................................................................18
2.1.4 Configuring Relay Data Communication....................................................................19
2.1.5 Connecting to the Relay via Reydisp .........................................................................20
APPENDIX 1
7SR242 Settings
©2010 Siemens Protection Devices Limited
Chapter 2 Page 2 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
List of Figures
Figure -1-1: Menu.....................................................................................................................................4
Figure -1-2 Fascia Contrast symbol .........................................................................................................4
Figure 1-3 Facia of 7SR242 Relay ...........................................................................................................5
Figure 1-4 Relay Identifier Screen............................................................................................................6
Figure 1-5: 7SR24 Menu Structure ..........................................................................................................7
Figure 1-6: Schematic Diagram: Current and Voltage Meters (includes optional
functionality).......................................................................................................................12
Figure 2-1 USB connection to PC ..........................................................................................................17
Figure 2-2 RS485 connection to PC ......................................................................................................18
Figure 2-3 Fibre Optic Connection to PC ...............................................................................................18
Figure 2-4 PC Comms Port Allocation ...................................................................................................20
©2010 Siemens Protection Devices Limited
Chapter 2 Page 3 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
Section 1: Introduction
1.1
Relay Menus And Display
All relay fascias contain the same access keys although the fascias may differ in appearance from model to
model. The basic menu structure is also the same in all products and consists of four main menus, these being,
Settings Mode - allows the user to view and (if allowed via the settings mode password) change settings in the
relay.
Instruments Mode - allows the user to view the relay meters e.g. current, voltage etc.
Fault Data Mode - allows the user to see type and data of any fault that the relay has detected.
The menus can be viewed via the LCD by pressing the access keys as below,
Figure -1-1: Menu
Pressing CANCEL returns to the Relay Identifier screen
LCD Contrast
To adjust the contrast on the LCD insert a flat nosed screwdriver into the screw below the contrast symbol,
turning the screw left or right decreases and increases the contrast of the LCD.
Figure -1-2 Fascia Contrast symbol
©2010 Siemens Protection Devices Limited
Chapter 2 Page 4 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
Figure 1-3 Facia of 7SR242 Relay
©2010 Siemens Protection Devices Limited
Chapter 2 Page 5 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
1.2
Operation Guide
1.2.1User Interface Operation
The basic menu structure flow diagram is shown in Figure 1.2-2. This diagram shows the main modes of display:
Settings Mode, Instrument Mode, Fault Data Mode and Control Mode.
When the relay leaves the factory all data storage areas are cleared and the settings set to default as specified in
settings document.
When the relay is first energised the user is presented with the following message: -
Duobias 7SR242
_______________________________
ENTER to CONTROL
Figure 1-4 Relay Identifier Screen
On the factory default setup the relay LCD should display the relay identifier, on each subsequent power-on the
screen that was showing prior to the last power-off will be displayed.
The push-buttons on the fascia are used to display and edit the relay settings via the LCD, to display and activate
the control segment of the relay, to display the relays instrumentation and Fault data and to reset the output
relays and LED’s.
The five push-buttons have the following functions:
READ DOWN
READ UP
These pushbuttons are used to navigate the menu structure and to adjust settings.
ENTER
ENTER
The ENTER push-button is used to initiate and accept setting changes.
When a setting is displayed pressing the ENTER key will enter the edit mode, the setting will flash and can now
be changed using the or buttons. When the required value is displayed the ENTER button is pressed again
to accept the change.
When an instrument is displayed pressing ENTER will toggle the instruments favourite screen status.
CANCEL
CANCEL
This push-button is used to return the relay display to its initial status or one level up in the menu structure.
Pressed repeatedly will return to the Relay Identifier screen. It is also used to reject any alterations to a setting
while in the edit mode.
This push-button is used to reset the fault indication on the fascia. When on the Relay Identifier screen it also
acts as a lamp test button, when pressed all LEDs will momentarily light up to indicate their correct operation. It is
also moves the cursor right when navigating through menus and settings.
©2010 Siemens Protection Devices Limited
Chapter 2 Page 6 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
7SR242 DUOBIAS
__________________________
ENTER to CONTROL
INSTRUMENTS MODE
SETTINGS DISPLAY MODE
INSTRUMENTS MODE
CB1
SYSTEM CONFIGURATION
FAVOURITE METERS
CB2
CT/VT CONFIGURATION
DIFFERENTIAL METERS
E/F Protection
FUNCTION CONFIG
CURRENT METERS
Set L or R
DIFFERENTIAL PROTECTION
VOLTAGE METERS
Set Remote
CURRENT PROTECTION
Set Local
51-1
51-2
50-1
50-2
FREQUENCY METERS
51N-1
51N-2
50N-2
50N-1
OVERFLUXING METERS
51G-1
51G-2
50G-2
50G-1
THERMAL METERS
RESTRICTED E/F
64H-1
64H-2
MAINTENANCE METERS
NPS OVERCURRENT
46IT
46DT
PHASE OVERCURRENT
DERIVED E/F
Set Service
MEASURED E/F
FAULT DATA MODE
Fault n
DD/MM/YY
GENERAL ALARM METERS
UNDER CURRENT
37-1
37-2
37G-1
37G-2
DEMAND METERS
THERMAL
OPEN CIRCUIT
VOLTAGE PROTECTION
PHASE U/O VOLTAGE
NEUTRAL OVERVOLTAGE
46BC-1
46BC-2
27/59-1
27/59-2
27/59-3
27/59-4
BINARY INPUT METERS
BINARY OUTPUT METERS
59NIT
59NDT
VIRTUAL METERS
U/O FREQUENCY
OVERFLUXING
SUPERVISION
81-1
81-2
81-3
81-4
81-5
81-6
24DT-1
24DT-2
24IT
COMMUNICATION METERS
MISCELLANEOUS METERS
INRUSH DETECTOR
OVERFLUXING DETECTOR
QUICK LOGIC METERS
CB FAIL
TRIP CCT SUPERVISION
CLOSE CCT SUPERVISION
CONTROL & LOGIC
CB CONTROL
QUICK LOGIC
INPUT CONFIGURATION
INPUT MATRIX
BINARY INPUT CONFIG.
GENERAL ALARMS
OUTPUT CONFIGURATION
OUTPUT MATRIX
BINARY OUTPUT CONFIG
LED CONFIG
PICKUP CONFIG
MAINTENANCE
CB COUNTERS
I2T CB WEAR
DATA STORAGE
COMMUNICATIONS
Figure 1-5: 7SR24 Menu Structure
©2010 Siemens Protection Devices Limited
Chapter 2 Page 7 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
1.3
Settings Display
The Settings Mode is reached by pressing the READ DOWN button from the relay identifier screen.
Once the Settings Mode title screen has been located pressing the READ DOWN button takes the user into
the Settings mode sub-menus.
Each sub-menu contains the programmable settings of the relay in separate logical groups. The sub menus are
accessed by pressing the TEST/RESET button. Pressing the button will scroll through the settings, after the
last setting in each sub menu is reached the next sub menu will be displayed. If a particular sub menu is not
required to be viewed then pressing will move directly to the next one in the list.
While a setting is being displayed on the screen the ENTER button can be pressed to edit the setting value. If the
relay is setting password protected the user will be asked to enter the password. If an incorrect password is
entered editing will not be permitted. All screens can be viewed even if the password is not known.
While a setting is being edited flashing characters indicate the edit field. Pressing the or buttons will display
the valid field values. If these buttons are held on, the rate of scrolling will increase.
Once editing is complete pressing the ENTER button stores the new setting into the non-volatile memory. The
setting change is effective immediately unless any protection element is operating, in which case the change
becomes effective when no elements are operating.
The actual setting ranges and default values for each relay model can be found in the appendix to this section of
the manual.
1.4
Instruments Mode
The Instrument Mode sub-menu displays key quantities and information to aid with commissioning. The following
meters are available and are navigated around by using the ,and TEST/REST buttons.
Instrument
FAVOURITE METERS
to view
Description
This allows the user to view his previously constructed list of
‘favourite meters’ by pressing TEST/RESET button and
the READ DOWN button to scroll though the meters added
to this sub-group
To construct a sub-group of favourite meters, first go to the
desired meter then press ENTER this will cause a message
to appear on the LCD ‘Add To Favourites YES pressing
ENTER again will add this to the FAVOURITE METERS
Sub-menu. To remove a meter from the FAVOURITE
METERS sub-menu go to that meter each in the
FAVOURITE METERS sub-menu or at its Primary location
press ENTER and the message ‘Remove From Favourites’
will appear press ENTER again and this meter will be
removed from the FAVOURITE METERS sub-group.
The relay will poll through, displaying each of the meters
selected in favourite meters, after no key presses have been
detected for a user settable period of time. The time is set in
the Setting menu>System Config>Favourite Meters Timer.
©2010 Siemens Protection Devices Limited
Chapter 2 Page 8 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
DIFFERENTIAL METERS
This is the sub-group that includes all the meters that are
associated with Current TEST/RESET allows access to
this sub-group
to view
W1 Line
Ia
Ib
Ic
W2 Line
Ia
Ib
Ic
W1 Relay
Ia
Ib
Ic
W2 Relay
Ia
Ib
Ic
Operate
Ia
Ib
Ic
Restrain
Ia
Ib
Ic
W1 1st Harmonic
Ia
Ib
Ic
W1 2nd Harmonic
Ia
Ib
Ic
nd
W1 5 Harmonic
Ia
Ib
Ic
W2 1st Harmonic
nd
W2 2
0.00xIn ----o
0.00xIn ----o
0.00xIn ----o
0.00xIn ----o
0.00xIn ----o
o
0.00xIn ---o
0.00xIn ---0.00xIn ----o
0.00xIn ----o
0.00xIn ----o
0.00xIn ----o
0.00xIn ----o
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
0.00xIn
Harmonic
W2 5th Harmonic
©2010 Siemens Protection Devices Limited
Displays Winding 1 Input 3 Phase currents Nominal RMS
values & phase angles with respect to PPS voltage.
Displays Winding 2 Input 3 Phase currents Nominal RMS
values & phase angles with respect to PPS voltage.
Displays Winding 1 relay currents Nominal RMS values &
phase angles with respect to PPS voltage.
Displays Winding 2 relay currents Nominal RMS values &
phase angles with respect to PPS voltage.
Displays the 3 phase operate currents’ relevant to the biased
differential (87BD) and highset differential (87HS) functions.
Displays the 3 phase restrain currents relevant to the biased
differential (87BD) function.
Displays W1 3 phase fundamental current components
Nominal RMS values.
Displays W1 3 phase 2nd Harmonic current components
Nominal RMS values.
Displays W1 3 phase 5th Harmonic current components
Nominal RMS values.
See above.
See above.
See above.
Chapter 2 Page 9 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
CURRENT METERS
This is the sub-group that includes all the meters that are
associated with Current TEST/RESET allows access to
this sub-group
to view
W1 Primary
Ia
Ib
Ic
W1 Secondary
Ia
Ib
Ic
W1 Nominal
Ia
Ib
Ic
W1 Sequence
Izps
Ipps
Inps
W1 Derived Earth (In)
Ia
Ib
Ic
W2 Primary
0.00kA
0.00kA
0.00kA
0.00A
0.00A
0.00A
0.00xIn ----o
0.00xIn ----o
0.00xIn ----o
0.00xIn ----o
o
0.00xIn ---0.00xIn ----o
kA
A
xIn
Displays the 3 phase currents Secondary RMS values
Displays the 3 Phase currents Nominal RMS values & phase
angles with respect to PPS voltage.
Displays the 3 Phase currents Nominal RMS values & phase
angles with respect to PPS voltage.
Displays the Earth currents derived from W1 line currents.
RMS values.
See above.
W2 Secondary
See above.
W2 Nominal
See above.
W2 Sequence
See above.
W2 Derived Earth (In)
Measured Earth – 1 (Ig)
Ig
Ig
Ig
Measured Earth – 2 (Ig)
Ig
Ig
Ig
Displays the 3 phase currents Primary RMS values
See above.
0.000kA
0.000A
0.000xIn
0.000kA
0.000A
0.000xIn
©2010 Siemens Protection Devices Limited
Displays the Earth currents for IG1. RMS values
Displays the Earth currents for IG2. RMS values
Chapter 2 Page 10 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
VOLTAGE METERS
This is the sub-group that includes all the meters that are
associated with Voltage TEST/RESET allows access to
this sub-group
to view
Voltage Meters
Pri (Ph-Ph)
Sec
Nom
0.00kV
0.00V
0.00xVn
FREQUENCY METERS
This is the sub-group that includes all the meters that are
associated with Frequency TEST/RESET allows access
to this sub-group
to view
Frequency
00.000Hz
OVERFLUXING METERS
xVn
xVn/fn
%
THERMAL METERS
Displays the over-fluxing values
This is the sub-group that includes all the meters that are
associated with Thermal TEST/RESET allows access to
this sub-group
to view
Thermal Status
Phase A
Phase B
Phase C
Displays the power system frequency.
This is the sub-group that includes all the meters that are
associated with Over-fluxing. TEST/RESET allows access
to this sub-group
to view
Overfluxing Meters
V/f V
V/f
V/f 24IT
Displays the Voltage RMS values
0.0%
0.0%
0.0%
©2010 Siemens Protection Devices Limited
Displays the thermal capacity
Chapter 2 Page 11 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
W1
Ia
Line
W1
Ia
prim
W1
Ia
secy
W1
Ia
Nom.
W1
1st
Harm
W1
2nd
Harm
W1
W1
5th
Therm
Harm
W1
Ib
Line
W1
Ib
prim
W1
Ib
secy
W1
Ib
Nom.
W1
1st
Harm
W1
2nd
Harm
W1
W1
5th
Therm
Harm
W1
Ic
Line
W1
Ic
prim
W1
Ic
secy
W1
Ic
Nom.
W1
1st
Harm
W1
2nd
Harm
W1
W1
5th
Therm
Harm
W1
I
Seq.
W1
I EF
Der.
Meas
Earth
1
ICT
W1
Rel.
Ia
W1
Rel.
Ib
W1
Rel.
Ic
Ia
Op.
7SR242_-2_A_1-0CA0
Ia
Rest.
Ib
Op.
Ib
Rest.
Ic
Op.
Ic
Rest.
W2
Rel.
Ia
Meas
Earth
2
W2
Rel.
Ib
W2
Rel.
Ic
ICT
W2
I
Seq.
W2
I EF
Der.
W2
Ic
Line
W2
Ic
prim
W2
Ic
secy
W2
Ic
Nom.
W2
1st
Harm
W2
2nd
Harm
W2
W2
5th
Therm
Harm
W2
Ib
Line
W2
Ib
prim
W2
Ib
secy
W2
Ib
Nom.
W2
1st
Harm
W2
2nd
Harm
W2
W2
5th
Therm
Harm
W2
Ia
Line
W2
Ia
prim
W2
Ia
secy
W2
Ia
Nom.
W2
1st
Harm
W2
2nd
Harm
W2
W2
5th
Therm
Harm
V
Prim
V
Secy
V
Nom.
F
V/F
Figure 1-6: Schematic Diagram: Current and Voltage Meters (includes optional functionality)
©2010 Siemens Protection Devices Limited
Chapter 2 Page 12 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
MAINTENANCE METERS
This is the sub-group that includes all the meters that are
associated with Maintenance TEST/RESET allows
access to this sub-group
to view
CB1 Manual Close
Last Close
CB1 Manual Open
Last Open
CB2 Manual Close
Last Close
CB2 Manual Open
Last Open
CB1 Total Trips
Count
Target
CB1 Delta Trips
Count
Target
CB2 Total Trips
Count
Target
CB2 Delta Trips
Count
Target
CB1 Wear
Phase A
Phase B
Phase C
CB2 Wear
Phase A
Phase B
Phase C
CB1 Trip Time
Trip Time
CB2 Trip Time
Trip Time
ms
Displays the CB manual opening and closing times
ms
ms
Displays the CB opening and closing times
ms
0
100
0
100
0
100
0
100
0.00MA^2s
0.00MA^2s
0.00MA^2s
0.00MA^2s
0.00MA^2s
0.00MA^2s
ms
Displays the number of CB trips experienced by the CB
Displays the number of CB trips experienced by the CB
Displays the number of CB trips experienced by the CB
Displays the number of CB trips experienced by the CB
Displays the current measure of circuit breaker wear.
Displays the current measure of circuit breaker wear.
Displays the CB manual opening and closing times
ms
©2010 Siemens Protection Devices Limited
Chapter 2 Page 13 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
GENERAL ALARM METERS
This is the sub-group that includes all the meters that are
associated with the Binary inputs TEST/RESET allows
access to this sub-group
to view
General Alarms
ALARM 1
General Alarms
ALARM 2
General Alarms
ALARM 3
General Alarms
ALARM 4
General Alarms
ALARM 5
General Alarms
ALARM 6
General Alarms
ALARM 7
General Alarms
ALARM 8
General Alarms
ALARM 9
General Alarms
ALARM 10
General Alarms
ALARM 11
General Alarms
ALARM 12
Cleared
Cleared
Cleared
Cleared
Cleared
Cleared
Cleared
Cleared
Cleared
Cleared
Cleared
Cleared
DEMAND METERS
This is the sub-group that includes Demand meters. Values
are available for user defined time periods. TEST/RESET allows access to this sub-group
to view
Voltage Demand
W1 I Phase A Demand
W1 I Phase B Demand
W1 I Phase C Demand
W2 I Phase A Demand
W2 I Phase B Demand
W2 I Phase C Demand
Frequency Demand
Displays maximum, minimum and mean values
BINARY INPUT METERS
to view
BI 1-8
BI 9-13
Displays the state of General Alarm
---- ------- -
©2010 Siemens Protection Devices Limited
This is the sub-group that includes all the meters that are
associated with the Binary inputs TEST/RESET allows
access to this sub-group
Displays the state of DC binary inputs 1 to 8 (The number of
binary inputs may vary depending on model)
Chapter 2 Page 14 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
BINARY OUTPUT METERS
This is the sub-group that includes all the meters that are
associated with the Binary Outputs TEST/RESET allows
access to this sub-group
to view
BO 1-8
BO 9-14
---- ------- --
Displays the state of DC binary Outputs 1 to 8. (The number
of binary outputs may vary depending on model)
VIRTUAL METERS
This is the sub-group that shows the state of the virtual status inputs in
the relay TEST/RESET allows access to this sub-group
to view
V 1-8
V 9-16
---- ------- ----
Displays the state of Virtual Outputs 1 to 16 (The number of virtual
inputs will vary depending on model)
COMMUNICATION METERS
This is the sub-group that includes all the meters that are
associated with Communications ports TEST/RESET allows access to this sub-group
to view
COM1
COM2
COM3
COM4
COM1 TRAFFIC
Tx1
Rx1
Rx1 Errors
COM2 TRAFFIC
Tx2
Rx2
Rx2 Errors
COM3 TRAFFIC
Tx3
Rx3
Rx3 Errors
COM4 TRAFFIC
Tx4
Rx4
Rx4 Errors
Displays which com ports are currently active
Displays traffic on Com1
0
0
0
Displays traffic on Com2
0
0
0
Displays traffic on Com3
0
0
0
Displays traffic on Com4
0
0
0
MISCELLANEOUS METERS
This is the sub-group that includes indication such as the
relays time and date, the amount of fault and waveform
records stored in the relay TEST/RESET allows access to
this sub-group
to view
Date
Time
Waveform Recs
Fault Recs
DD/MM/YYYY
HH:MM:SS
0
0
Event Recs
Data Log Recs
0
0
©2010 Siemens Protection Devices Limited
This meter displays the date and time and the number of
Fault records and Event records stored in the relay.
The records stored in the relay can be cleared using the
options in the Settings Menu>Data Storage function.
Chapter 2 Page 15 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
QUICK LOGIC METERS
to view
E 1-8
E 9-16
E1 Equation
EQN
TMR 0-0
CNT 0-1
En Equation
1.5
0
=0
=0
=0
Fault Data Mode
The Fault Data Mode sub menu lists the time and date of the previous ten protection operations. The stored data
about each fault can be viewed by pressing the TEST/RESET button. Each record contains data on the
operated elements, analogue values and LED flag states at the time of the fault. The data is viewed by scrolling
down using the button.
©2010 Siemens Protection Devices Limited
Chapter 2 Page 16 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
Section 2: Setting the Relay Using Reydisp Evolution
To set the relay using the communication port the user will need the following:PC with REYDISP Evolution Installed.
(REYDISP can be downloaded from our website
www.siemens.com/energy and found under the submenu ‘Software’)This software requires windows 2000-service
pack 4 or above, or windows XP with service pack 2 or above.
2.1
Physical Connection
The relay can be connected to Reydisp via any of the communication ports on the relay. Suitable communication
Interface cable and converters are required depending which port is being used.
2.1.1
Front USB connection
To connect your pc locally via the front USB port.
Figure 2-1 USB connection to PC
©2010 Siemens Protection Devices Limited
Chapter 2 Page 17 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
2.1.2
Rear RS485 connection
Figure 2-2 RS485 connection to PC
2.1.3
Optional rear fibre optic connection
Figure 2-3 Fibre Optic Connection to PC
Sigma devices have a 25 pin female D connector with the following pin out.
Pin
2
3
4
5
6
7
8
20
©2010 Siemens Protection Devices Limited
Function
Transmit Data
Received Data
Request to Send
Clear to Send
Data set ready
Signal Ground
Received Line Signal Detector
Data Terminal Ready
Chapter 2 Page 18 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
2.1.4
Configuring Relay Data Communication
Using the keys on the relay fascia scroll down the settings menu’s into the ‘communications’ menu. All of the
below settings may not be available in all relay types. Reydisp software is compatible with IEC60870-5-103
protocol.
COM1-RS485 Port
COM2-USB Port (Front)
COM3 – Optional Fibre Optic
COM4 – Optional Fibre Optic
Setting name
Range
Station Address
0 … 65534
DNP3 Unsolicited
Events
DNP3 Destination
Address
ENABLED, DISABLED
Default
0
Units
Notes
Address given to relay to
identify that relay from
others which may be using
the same path for
communication as other
relays for example in a fibre
optic hub
0 … 65534
0
COM1-RS485 Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, DNP3
IEC60870-5103
COM1-RS485 Baud
Rate
75 110 150 300 600 1200
2400 4800 9600 19200
19200
38400
COM1-RS485 Parity
NONE, ODD, EVEN
EVEN
COM2-USB Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, ASCII,
DNP3
IEC60870-5103
COM2 is the front USB port.
COM3 Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, DNP3
IEC6-0870-5103
COM3 This is an optional
rear mounted Fibre Optic ST
connection
COM3 Baud Rate
75 110 150 300 600 1200
2400 4800 9600 19200
57600
38400 57600 115200
COM3 Parity
NONE, ODD, EVEN
EVEN
COM3 Line Idle
LIGHT ON, LIGHT OFF
LIGHT OFF
COM3 Data echo
ON, OFF
OFF
COM4 Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, DNP3
OFF
COM4 Baud Rate
75 110 150 300 600 1200
2400 4800 9600 19200
19200
38400
COM4 Parity
NONE, ODD, EVEN
EVEN
COM4 Line Idle
LIGHT ON, LIGHT OFF
LIGHT OFF
COM4 Data echo
ON, OFF
OFF
©2010 Siemens Protection Devices Limited
COM1 is the rear mounted
RS485 port
COM4 This is an optional
rear mounted Fibre Optic ST
connection
Chapter 2 Page 19 of 20
7SR242 Duobias Settings, Configuration & Instruments Guide
2.1.5
Connecting to the Relay via Reydisp
When Reydisp software is running all available communication ports of the PC will automatically be detected.
On the start page tool bar open up the sub-menu File > Connect.
The ‘Communication Manager’ window will display all available communication ports. With the preferred port
highlighted, select the ‘Properties’ option and ensure the baud rate and parity match that selected in the relay
Data Comms settings. Select ‘Connect’ to initiate the relay-PC connection.
Figure 2-4 PC Comms Port Allocation
Via the Relay > Set Address > Address set the relay address (1-254) or alternatively search for connected
devices using the Relay > Set Address > Device Map. The relay can now be configured using the Reydisp
software. Please refer to the Reydisp Evolution Manual for further guidance.
©2010 Siemens Protection Devices Limited
Chapter 2 Page 20 of 20
7SR242 Duobias Performance Specification
7SR242 Duobias
Multi-Function 2-Winding Transformer Protection Relay
Document Release History
This document is issue 2010/02. The list of revisions up to and including this issue is:
2010/02
Document reformat due to rebrand
2010/02
Third issue. Software revision 2662H80001 R4c-3
2008/07
Second issue. Software revision 2662H80001R3d-2c.
2008/05
First issue
Software Revision History
2010/02
2662H80001 R4c-3
Revisions to: VT ratio settings, 87BD 1st bias slope limit setting
increments, CB fail function, LED CONFIG menu, DATA STORAGE
menu.
Added: Open circuit detection (46BC), CONTROL MODE menu,
Close circuit supervision (74CCS), Measured earth fault undercurrent
(37G), Pulsed output contacts.
2008/07
2662H80001R3d-2c.
Demand metering. Optional DNP3.0 data comms.
2008/05
2662H80001R3-2b
First Release
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Performance Specification
Contents
Document Release History....................................................................................................................1
Software Revision History.....................................................................................................................1
Contents ..................................................................................................................................................2
Section 1: Common Functions .............................................................................................................5
1.1 General .....................................................................................................................................5
1.1.1 CE Conformity ..............................................................................................................5
1.1.2 Reference.....................................................................................................................5
1.1.3 Dimensions and Weights .............................................................................................5
1.2 Energising Quantities................................................................................................................6
1.2.1 Auxiliary Power Supply ................................................................................................6
1.2.2 AC Current ...................................................................................................................6
1.2.3 AC Voltage ...................................................................................................................7
1.2.4 Binary (Digital) Outputs ................................................................................................7
1.2.5 Binary (Digital) Inputs...................................................................................................8
1.3 Functional Performance..........................................................................................................10
1.3.1 Instrumentation ..........................................................................................................10
1.3.2 USB Data Communication Interface ..........................................................................10
1.3.3 Fibre optic Data Communication Interface.................................................................10
1.3.4 RS485 Data Communication Interface ......................................................................10
1.3.5 Real Time Clock.........................................................................................................10
1.4 Environmental Performance ...................................................................................................11
1.4.1 General.......................................................................................................................11
1.4.2 Emissions ...................................................................................................................11
1.4.3 Immunity.....................................................................................................................12
1.4.4 Mechanical .................................................................................................................13
Section 2: Protection Functions .........................................................................................................14
2.1 24 Over Fluxing.......................................................................................................................14
2.1.1 Reference (24DT) ......................................................................................................14
2.1.2 Operate and Reset Level (24DT)...............................................................................14
2.1.3 Operate and Reset Time (24DT) ...............................................................................14
2.1.4 Reference (24IT) ........................................................................................................14
2.1.5 Operate and Reset Level (24IT) ................................................................................14
2.1.6 Operate and Reset Time (24IT) .................................................................................15
27/59 Under/Over Voltage..............................................................................................................16
2.1.7 Reference...................................................................................................................16
2.1.8 Operate and Reset Level ...........................................................................................16
2.1.9 Operate and Reset Time............................................................................................16
2.2 37,37G Undercurrent ..............................................................................................................17
2.2.1 Reference...................................................................................................................17
2.2.2 Operate and Reset Level ...........................................................................................17
2.2.3 Operate and Reset Time............................................................................................17
2.3 46BC Open Circuit ..................................................................................................................18
2.3.1 Reference...................................................................................................................18
2.3.2 Operate and Reset Level ...........................................................................................18
2.3.3 Operate and Reset Time............................................................................................18
2.4 46NPS Negative Phase Sequence Overcurrent.....................................................................19
2.4.1 Reference (46DT) ......................................................................................................19
2.4.2 Operate and Reset Level (46DT)...............................................................................19
2.4.3 Operate and Reset Time (46DT) ...............................................................................19
2.4.4 Reference (46IT) ........................................................................................................19
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 2 of 45
7SR242 Duobias Performance Specification
2.4.5 Operate and Reset Level (46IT) ................................................................................19
2.4.6 Operate and Reset Time (46IT) .................................................................................20
2.5 49 Thermal Overload ..............................................................................................................21
2.5.1 Reference...................................................................................................................21
2.5.2 Operate and Reset Level ...........................................................................................21
2.5.3 Operate and Reset Time............................................................................................21
2.6 50 instantaneous overcurrent .................................................................................................23
2.6.1 Reference...................................................................................................................23
2.6.2 Operate and Reset Level ...........................................................................................23
2.6.3 Operate and Reset Time............................................................................................23
2.7 50N instantaneous Derived Earth Fault..................................................................................24
2.7.1 Reference...................................................................................................................24
2.7.2 Operate and Reset Level ...........................................................................................24
2.7.3 Operate and Reset Time............................................................................................24
2.8 50G Instantaneous Measured Earth Fault..............................................................................25
2.8.1 Reference...................................................................................................................25
2.8.2 Operate and Reset Level ...........................................................................................25
2.8.3 Operate and Reset Time............................................................................................25
2.9 51 Time Delayed Overcurrent.................................................................................................26
2.9.1 Reference...................................................................................................................26
2.9.2 Operate and Reset Level ...........................................................................................26
2.9.3 Operate and Reset Time............................................................................................27
2.10 51N Time Delayed Derived Earth Fault ..................................................................................28
2.10.1 Reference...................................................................................................................28
2.10.2 Operate and Reset Level ...........................................................................................28
2.10.3 Operate and Reset Time............................................................................................29
2.11 51G Time Delayed Measured Earth Fault ..............................................................................30
2.11.1 Reference...................................................................................................................30
2.11.2 Operate and Reset Level ...........................................................................................30
2.11.3 Operate and Reset Time............................................................................................31
2.12 59N Neutral Voltage Displacement.........................................................................................35
2.12.1 Reference (59NDT)....................................................................................................35
2.12.2 Operate and Reset Level (59NDT) ............................................................................35
2.12.3 Operate and Reset Time (59NDT).............................................................................35
2.12.4 Reference (59NIT) .....................................................................................................35
2.12.5 Operate and Reset Level (59NIT)..............................................................................35
2.12.6 Operate and Reset Time (59NIT) ..............................................................................36
2.13 64H Restricted Earth Fault Protection ....................................................................................37
2.13.1 Reference...................................................................................................................37
2.13.2 Operate and Reset Level ...........................................................................................37
2.13.3 Operate and Reset Time............................................................................................37
2.14 81Under/Over Frequency .......................................................................................................38
2.14.1 Reference...................................................................................................................38
2.14.2 Operate and Reset Level ...........................................................................................38
2.14.3 Operate and Reset Time............................................................................................38
2.15 87 Biased Differential..............................................................................................................39
2.15.1 Reference...................................................................................................................39
2.15.2 Operate Time .............................................................................................................40
2.16 87HS High-Set Differential......................................................................................................41
2.16.1 Reference...................................................................................................................41
2.16.2 Operate and Reset Level ...........................................................................................41
2.16.3 Operate and Reset Time............................................................................................41
Section 3: Supervision Functions ......................................................................................................42
3.1 50BF Circuit Breaker Fail........................................................................................................42
3.1.1 Reference...................................................................................................................42
3.1.2 Operate and Reset Level ...........................................................................................42
3.1.3 Operate and Reset Time............................................................................................42
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 3 of 45
7SR242 Duobias Performance Specification
3.2 74TCS/CCS Trip/Close Circuit Supervision............................................................................43
3.2.1 Reference...................................................................................................................43
3.2.2 Operate and Reset Time............................................................................................43
3.3 81HBL2 Inrush Detector .........................................................................................................44
3.3.1 Reference...................................................................................................................44
3.3.2 Operate and Reset Level ...........................................................................................44
3.3.3 Operate and Reset Time............................................................................................44
3.4 81HBL5 Overfluxing Detector .................................................................................................45
3.4.1 Reference...................................................................................................................45
3.4.2 Operate and Reset Level ...........................................................................................45
3.4.3 Operate and Reset Time............................................................................................45
List of Figures
Figure 1-1: Binary Input Configurations Providing Compliance with EATS 48-4 Classes
ESI 1 and ESI 2 ...................................................................................................................9
Figure 2-1 Thermal Overload Protection Curves ................................................................................22
Figure 2-2 IEC IDMTL Curves (Time Multiplier=1)..............................................................................32
Figure 2-3 ANSI IDMTL Operate Curves (Time Multiplier=1) .............................................................33
Figure 2-4 ANSI Reset Curves (Time Multiplier=1).............................................................................34
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 4 of 45
7SR242 Duobias Performance Specification
Section 1: Common Functions
1.1
General
1.1.1 CE Conformity
This product is CE compliant to relevant EU directives.
1.1.2 Reference
This product complies with IEC 60255-3, IEC 60255-6 and IEC 60255-12.
1.1.2.1
Accuracy Reference Conditions
This product has been tested under the following conditions, unless specifically stated otherwise.
Parameter
Value
Auxiliary supply
Nominal
AC Voltage
Nominal
AC Current
Nominal
Frequency
Nominal
Ambient temperature
20 qC
1.1.3 Dimensions and Weights
1.1.3.1
Dimensions
Parameter
Width
Value
7SR2422, E8 case
207.5 mm
7SR2423, E10 case
260 mm
Height
177 mm
Depth behind panel
(including clearance for wiring and fibre)
241.5 mm
Projection (from front of panel)
31 mm
See appropriate case outline and panel drilling drawing, as specified in Diagrams and Parameters document, for
complete dimensional specifications.
1.1.3.2
Weights
Parameter
Net weight
Value
7SR2422, E8 case
5.2 kg
7SR2423, E10 case
6.8 kg
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 5 of 45
7SR242 Duobias Performance Specification
1.2
Energising Quantities
1.2.1
Auxiliary Power Supply
Nominal
VAUX
30, 48, 110, 220 VDC
1.2.1.1
Attribute
Operating Range
24 to 290 VDC
Burden
Value
30V DC
48V DC
110V DC
220V DC
Quiescent (typical)
6.0 W
Quiescent (back light)
7.0 W
Quiescent (typical)
5.5W
Quiescent (back light)
6.5W
Quiescent (typical)
6.5W
Quiescent (back light)
7.5W
Quiescent (typical)
7.5W
Quiescent (back light)
8.5W
1.2.2 AC Current
Nominal
Measuring Range
In
1, 5 A Phase and earth
80 x In
fn
50, 60Hz
47 to 62Hz
Note. 1 A and 5 A nominal inputs are user selectable on each model.
1.2.2.1
Burden
Attribute
AC Burden
1.2.2.2
Value - Phase and Earth
1A
5A
0.1 VA
0.3 VA
Thermal Withstand
Overload Current
Overload Period
Phase and Earth
1A
5A
Continuous
3.0 xIn
10 minutes
3.5 xIn
5 minutes
4.0 xIn
3 minutes
5.0 xIn
2 minutes
6.0 xIn
3 seconds
57.7A
202A
2 seconds
70.7A
247A
1 second
100A
350A
1 cycle
700A
2500A
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 6 of 45
7SR242 Duobias Performance Specification
1.2.3 AC Voltage
Nominal
Operating Range
Vn
40 to 160 V
Up to 270 V
fn
50, 60Hz
47 to 62Hz
1.2.3.1
Attribute
Burden
Value
AC Burden
0.01 VA at 110 V
1.2.4 Binary (Digital) Outputs
Contact rating to IEC 60255-0-2
Attribute
Value
Carry continuously
Make and carry
(L/R d 40 ms and V d 300 V)
Break
( d 5 A and d 300 V)
5A AC or DC
for 0.5 s
20A AC or DC
for 0.2 s
30A AC or DC
AC resistive
1250 VA
AC inductive
250 VA at p.f. d 0.4
DC resistive
75 W
DC inductive
30 W at L/R d 40ms
50 W at L/R d 10ms
Contact Operate / Release Time
7ms / 3ms
Minimum number of operations
1000 at maximum load
Minimum recommended load
0.5 W at minimum of 10mA or 5V
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 7 of 45
7SR242 Duobias Performance Specification
1.2.5 Binary (Digital) Inputs
Nominal
VBI
1.2.5.1
Attribute
Operating Range
19 VDC
17 to 290 VDC
88 VDC
74 to 290 VDC
Performance
Maximum DC current for
operation
Value
VBI = 19 V
1.5mA
VBI = 88 V
1.5mA
Reset/Operate voltage ratio
t 90 %
Response time
< 7ms
Response time when programmed to energise
an output relay contact (i.e. includes output
relay operation)
< 20ms
The binary inputs have a low minimum operate current and may be set for high speed operation. Where a binary
input is both used to influence a control function (e.g. provide a tripping function) and it is considered to be
susceptible to mal-operation due to capacitive currents, the external circuitry can be modified to provide immunity
to such disturbances.
To comply with EATS 48-4, classes ESI 1 and ESI 2, external components / BI pick-up delays are required as
shown in fig. 1-1.
To achieve immunity from AC interference, a BI pick-up delay of typically one-cycle can be applied.
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 8 of 45
7SR242 Duobias Performance Specification
ESI-1
+
470
+
ESI-2
30V DC Nominal
(24 – 37.5V Operative)
IOP > 10mA
220
30V DC Nominal
(24 – 37.5V Operative)
IOP > 20mA
BI (19V)
1K5
BI (19V)
820
-
+
1K6
-
+
48V DC Nominal
(37.5 – 60V Operative)
IOP > 10mA
820
48V DC Nominal
(37.5 – 60V Operative)
IOP > 20mA
BI (19V)
BI (19V)
820
1K5
-
-
BI DTL = 10ms
(10μF, 60V Capacitance discharge)
+
2K0
110V DC Nominal
(87.5 – 137.5V Operative)
IOP > 25mA
+
110V DC Nominal
(87.5 – 137.5V Operative)
IOP > 50mA
1K2
BI (19V)
BI (19V)
330
560
-
-
BI DTL = 10ms
(10μF, 150V Capacitance discharge)
+
110V DC Nominal
(87.5 – 137.5V Operative)
IOP > 25mA
+
110V DC Nominal
(87.5 – 137.5V Operative)
IOP > 50mA
BI (88V)
BI (88V)
1K3
2K7
-
-
BI DTL = 10ms
(10μF, 150V Capacitance discharge)
Resistor power ratings:
30V DC Nominal
48V DC Nominal
110V DC Nominal
110V DC Nominal
>3W
>3W
>10W (ESI- 1)
>20W (ESI-2)
Resistors must be wired with crimped connections as they may run hot
Figure 1-1: Binary Input Configurations Providing Compliance with EATS 48-4 Classes ESI 1 and ESI 2
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 9 of 45
7SR242 Duobias Performance Specification
1.3
Functional Performance
1.3.1 Instrumentation
Instrument Value
Reference
Typical accuracy
I
Current
I t 0.1 xIn
r 1 % In
V
Voltage
V t 0.8 xVn
r 1 % Vn
1.3.2 USB Data Communication Interface
Attribute
Value
Physical layer
Electrical
Connectors
USB-Type B
1.3.3 Fibre optic Data Communication Interface
Attribute
Value
Physical layer
Fibre-optic
Connectors
ST
Recommended fibre
62.5/125 Pm glass fibre with ST connector
Launch power (into recommended fibre)
-16 dBm
Receiver sensitivity
-24 dBm
TM
(BFOC/2.5)
1.3.4 RS485 Data Communication Interface
Attribute
Value
Physical layer
Electrical
Connectors
4mm Ring Crimp
1.3.5 Real Time Clock
1.3.5.1
Internal Clock
The specification below applies only while no external synchronisation signal (e.g. IRIG-B, IEC 60870-5-103) is
being received.
Attribute
Value
Accuracy (-10 to +55oC)
1.3.5.2
Attribute
r 3.5 ppm
IRIG-B
Value
Connector
BNC
Signal Type
IRIG-B 120, 122 or 123
Applied signal level
minimum 3 V, maximum 6 V, peak-to-peak
Signal : carrier ratio
t3
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 10 of 45
7SR242 Duobias Performance Specification
1.4
Environmental Performance
1.4.1 General
1.4.1.1
Temperature
IEC 60068-2-1/2
Type
Level
Operating range
-10 qC to +55 qC
Storage range
-25 qC to +70 qC
1.4.1.2
Humidity
IEC 60068-2-3
Type
Operational test
1.4.1.3
Level
Between all terminals and earth, or
between any two independent circuits
5.0 kV, 1.2/50 Ps 0.5j
Insulation
IEC 60255-5
Type
Level
Between any terminal and earth
Between independent circuits
Across normally open contacts
1.4.1.5
Type
56 days at 40 qC and 95 % relative humidity
Transient Overvoltage
IEC 60255-5
Type
1.4.1.4
Level
2.0 kV AC RMS for 1 min
1.0 kV AC RMS for 1 min
IP Ratings
Level
Installed with cover on
IP 50
Installed with cover removed
IP 30
1.4.2 Emissions
IEC 60255-25
1.4.2.1
Type
Radiated Radio Frequency
Limits at 10 m, Quasi-peak
30 to 230 MHz
40 dB(PV/m)
230 to 10000 MHz
47 dB(PV/m)
1.4.2.2
Conducted Radio Frequency
Type
Limits
Quasi-peak
Average
0.15 to 0.5 MHz
79 dB(PV)
66 dB(PV)
0.5 to 30 MHz
73 dB(PV)
60 dB(PV)
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 11 of 45
7SR242 Duobias Performance Specification
1.4.3 Immunity
1.4.3.1
Auxiliary DC Supply Variation
Quantity
Value
Allowable superimposed ac component
d 12% of DC voltage
Allowable breaks/dips in supply
(collapse to zero from nominal voltage)
d 20ms
1.4.3.2
High Frequency Disturbance
IEC 60255-22-1 Class III
Type
Level
Common (longitudinal) mode
2.5 kV
Series (transverse) mode
1.0 kV
1.4.3.3
Contact discharge
80 MHz to 1000 MHz
Variation
8.0 kV
d5%
Level
Variation
10 V/m
d5%
Level
Variation
4kV
d5%
Level
Variation
Fast Transients
IEC 60255-22-4 Class IV
Type
5/50 ns 2.5 kHz repetitive
1.4.3.6
Level
Radiated Immunity
IEC 60255-22-3 Class III
Type
1.4.3.5
Surge Immunity
IEC 60255-22-5
Type
Between all terminals and earth
4.0 kV
Between Line to Line
2.0 kV
1.4.3.7
d5%
Electrostatic Discharge
IEC 60255-22-2 Class IV
Type
1.4.3.4
Variation
d 10 %
Conducted Radio Frequency Interference
IEC 60255-22-6
Type
Level
Variation
0.15 to 80 MHz
10 V
d5%
1.4.3.8
Magnetic Field with Power Frequency
IEC 6100-4-8 Level 5
100A/m, (0.126mT) continuous
50Hz
1000A/m, (1.26mT) for 3s
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 12 of 45
7SR242 Duobias Performance Specification
1.4.4 Mechanical
1.4.4.1
Vibration (Sinusoidal)
IEC 60255-21-1 Class I
Type
Level
Vibration response
0.5 gn
Vibration endurance
1.0 gn
1.4.4.2
Variation
d5%
Shock and Bump
IEC 60255-21-2 Class I
Type
Level
Variation
Shock response
5 gn,
Shock withstand
15 gn, 11 ms
Bump test
10 gn, 16 ms
1.4.4.3
d5%
Seismic
IEC 60255-21-3 Class I
Type
Seismic response
1.4.4.4
Type
Durability
11 ms
Level
Variation
1 gn
d5%
Mechanical Classification
©2010 Siemens Protection Devices Limited
Level
> 106 operations
Chapter 3 - Page 13 of 45
7SR242 Duobias Performance Specification
Section 2: Protection Functions
2.1
24 Over Fluxing
2.1.1 Reference (24DT)
Parameter
Value
V/fs
Setting
0.10, 0.11… 2.0 x Nominal Voltage / Nominal Frequency
Hyst
Hysteresis setting
0, 0.1… 80.0%
td
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010… 10000,
10100… 14400 s
2.1.2 Operate and Reset Level (24DT)
V/fop
Attribute
Value
Operate level
100% x V/fs, r 2 % or r 0.02
Reset level
95% of V/fop
Repeatability
r1%
Variation
d5%
-10 °C to +55 °C
2.1.3 Operate and Reset Time (24DT)
Attribute
Value
0.9 to 1.1 x V/fs: 400 ms r 200ms
tbasic
Element basic operate time
top
Operate time following delay
tbasic + td, r 1 % or r 200ms
Repeatability
r1%
Disengaging time
< 250ms
0.9 to 2.0 x V/fs: 320 ms r 200ms
2.1.4 Reference (24IT)
treset
Parameter
Value
Reset setting
0, 1… 1000 s
2.1.5 Operate and Reset Level (24IT)
V/fop
Attribute
Value
Operate level
100% x V/fs, r 2 % or r 0.02
Reset level
95% of V/fop
Repeatability
r1%
Variation
d5%
-10 °C to +55 °C
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 14 of 45
7SR242 Duobias Performance Specification
2.1.6 Operate and Reset Time (24IT)
Attribute
Value
tbasic
Element basic operate time
500ms r 300ms
top
Operate time following delay
tbasic + td, r 1 % or r 2s
Repeatability
r1%
Disengaging time
< 250ms
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 15 of 45
7SR242 Duobias Performance Specification
27/59 Under/Over Voltage
2.1.7 Reference
Parameter
Value
Vs
Setting
5, 5.5…200V
hyst
Hysteresis setting
0, 0.1… 80.0%
td
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
2.1.8 Operate and Reset Level
Vop
Attribute
Value
Operate level
100 % Vs, r 1 % or r0.25V
Reset level
Overvoltage
= (100 % - hyst) x Vop, r 1 %
Undervoltage
= (100 % + hyst) x Vop, r 1 %
r1%
Repeatability
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.1.9 Operate and Reset Time
Attribute
tbasicE
Element basic
operate time
Value
Overvoltage
Undervoltage
top
0 to 1.1 x Vs: 73 ms r 10ms
0 to 2.0 xVs: 63 ms r 10ms
1.1 to 0.5 xVs: 58 ms r 10ms
Operate time following delay
tbasic + td, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Disengaging time
< 80 ms
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 16 of 45
7SR242 Duobias Performance Specification
2.2
37,37G Undercurrent
2.2.1 Reference
Parameter
Value
Is
37-n Setting
0.05, 0.10…5.0 xIn
td
37-n Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
Is
37-n U/I Guard Setting
0.05, 0.10…5.0 xIn
Parameter
Value
Is
37G-n Setting
0.05, 0.10…5.0 xIn
td
37G-n Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
2.2.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
100 % Is, r 5 % or r 1% In
Reset level
d 105 % Iop
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.2.3 Operate and Reset Time
Attribute
Value
tbasic
Element basic operate time
1.1 to 0.5 xIs: 35 ms, r 10ms
top
Operate time following delay
tbasic + td, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Overshoot time
< 40 ms
Disengaging time
< 60 ms
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 17 of 45
7SR242 Duobias Performance Specification
2.3
46BC Open Circuit
2.3.1
Reference
Parameter
Value
Iset
NPS to PPS ratio
20,21…100%
tf
Delay setting
0.03,04,20.0,20.1,100,101,1000,1010…..14400 s
Is
46BC-n U/I Guard Setting
0.05, 0.10…5.0 xIn
2.3.2
Icurr
Operate and Reset Level
Attribute
Value
Operate level: NPS to PPS ratio
100 % Iset r 5 %
Reset level
90 % Icurr , r 5 %
Repeatability
r1%
-10 °C to +55 °C
Variation
fnom - 3 Hz to fnom + 2 Hz
d5%
d5%
harmonics to fcutoff
Iop
Attribute
Value
Operate level: 46BC-n U/I Guard Setting
100 % Is, r 5 % or r 1% In
Reset level
d 105 % Iop
Repeatability
r1%
Variation
2.3.3
tbasic
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
Operate and Reset Time
Attribute
Value
Basic operate time 1x In to 0 A
40 ms
Operate time
tf + tbasic, r 1 % or r 20ms
Repeatability
r 1 % or r 20ms
fnom - 3 Hz to fnom + 2 Hz
Variation
d5%
harmonics to fcutoff
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 18 of 45
7SR242 Duobias Performance Specification
2.4
46NPS Negative Phase Sequence Overcurrent
2.4.1 Reference (46DT)
Parameter
Value
Is
Setting
0.05, 0.06... 4.0xIn
td
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
2.4.2 Operate and Reset Level (46DT)
Iop
Attribute
Value
Operate level
100 % Is, r 5 % or r 1% In
Reset level
t 95 % Iop
Repeatability
r1%
Transient overreach
(X/R d 100)
d -5 %
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.4.3 Operate and Reset Time (46DT)
Attribute
Value
0 to 2 xIs: 40 ms, r 10ms
tbasic
Element basic operate time
top
Operate time following delay
tbasic + td, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Overshoot time
<40 ms
Disengaging time
< 60 ms
0 to 5 xIs: 30 ms, r 10ms
2.4.4 Reference (46IT)
Parameter
Value
char
Characteristic setting
IEC-NI, -VI, -EI, -LTI; ANSI-MI, -VI, -EI; DTL
Tm
Time Multiplier setting
0.025, 0.050 … 1.6
Is
Setting
0.05, 0.06… 2.5xIn
td
Delay setting
0, 0.01… 20 s
tres
Reset setting
ANSI DECAYING, 0, 1… 60 s
2.4.5 Operate and Reset Level (46IT)
Iop
Attribute
Value
Operate level
105 % Is, r 4 % or r 1% In
Reset level
t 95 % Iop
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 19 of 45
7SR242 Duobias Performance Specification
2.4.6 Operate and Reset Time (46IT)
Attribute
Value
Starter operate time (t 2xIs)
35 ms, r 10ms
t op
char = IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
top
char = DTL
t op
ANSI DECAYING
ª
«
«
¬
u Tm , r 5 % absolute or r 50 ms,
IEC-NI :
IEC-VI :
IEC-EI :
IEC-LTI :
A
>IsI @P
K = 0.14, D = 0.02
K = 13.5, D = 1.0
K = 80.0, D = 2.0
K = 120.0, D = 1.0
º
B » u Tm , r 5 % absolute or r 50 ms,
»
1
¼
for char = ANSI-MI : A = 0.0515, B = 0.114, P = 0.02
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2, B = 0.1217, P = 2.0
td, r 1 % or r 20ms
t res
Reset time
>IsI @D 1
for char =
Operate time
char = ANSI-MI,
ANSI-VI,
ANSI-EI
K
R
>@
I 2
Is
1
u Tm ,
r 5 % absolute or r 50 ms,
for char = ANSI-MI : R = 4.85
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
tres
tres, r 1 % or r 20ms
Repeatability
r 1 % or r 20ms
Overshoot time
< 40 ms
Disengaging time
< 60 ms
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 20 of 45
7SR242 Duobias Performance Specification
2.5
49 Thermal Overload
2.5.1 Reference
Parameter
Value
Is
Overload setting
0.10, 0.11… 3 xIn
W
Time constant setting
1, 1.5… 1000 min
2.5.2 Operate and Reset Level
Iol
Attribute
Value
Overload level
100 % Is, r 5 % or r 1% In
Reset level
t 95 % Iol
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.5.3 Operate and Reset Time
Attribute
top
Overload trip operate time
Value
t
­ I 2 I 2P ½
W u ln ® 2
2¾
¯ I k u I B ¿
, r 5 % absolute or r 100ms,
where IP = prior current
Repeatability
r 100ms
Figure 2-1 shows the thermal curves for various time constants.
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 21 of 45
7SR242 Duobias Performance Specification
100000
10000
W= 1000 mins
1000
Time
(sec)
W = 100 mins
100
W = 10 mins
10
W = 1 min
1
0.1
0
1
2
3
4
5
6
7
8
9
10
Current (multiple of setting)
Figure 2-1
Thermal Overload Protection Curves
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 22 of 45
7SR242 Duobias Performance Specification
2.6
50 instantaneous overcurrent
2.6.1 Reference
Parameter
Is
td
Value
Setting
0.05, 0.10… 25, 25.5… 50 xIn
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
2.6.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
100 % Is, r 5 % or r 1% In
Reset level
t 95 % Iop
Repeatability
r1%
Transient overreach
(X/R d 100)
d -5 %
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.6.3 Operate and Reset Time
Attribute
Value
0 to 2 xIs: 35 ms, r 10ms
tbasic
Element basic operate time
top
Operate time following delay
tbasic + td, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
©2010 Siemens Protection Devices Limited
0 to 5 xIs: 25 ms, r 10ms
Chapter 3 - Page 23 of 45
7SR242 Duobias Performance Specification
2.7
50N instantaneous Derived Earth Fault
2.7.1 Reference
Parameter
Is
td
Value
Setting
0.05, 0.10… 25, 25.5… 50 xIn
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
2.7.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
100 % Is, r 5 % or r 1% In
Reset level
t 95 % Iop
Repeatability
r1%
Transient overreach
(X/R d 100)
d -5 %
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.7.3 Operate and Reset Time
Attribute
Value
0 to 2 xIs: 35 ms, r 10ms
tbasic
Element basic operate time
top
Operate time following delay
tbasic + td, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
©2010 Siemens Protection Devices Limited
0 to 5 xIs: 30 ms, r 10ms
Chapter 3 - Page 24 of 45
7SR242 Duobias Performance Specification
2.8
50G Instantaneous Measured Earth Fault
2.8.1 Reference
Parameter
Value
Is
Setting
0.005…25.0 xIn
td
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010…
10000, 10100… 14400 s
2.8.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
100 % Is, r 5 % or r 1% In
Reset level
t 95 % Iop
Repeatability
r1%
Transient overreach
(X/R d 100)
d -5 %
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.8.3 Operate and Reset Time
Attribute
Value
0 to 2 xIs: 35 ms, r 10ms
tbasic
Element basic operate time
top
Operate time following delay
tbasic + td, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
©2010 Siemens Protection Devices Limited
0 to 5 xIs: 25 ms, r 10ms
Chapter 3 - Page 25 of 45
7SR242 Duobias Performance Specification
2.9
51 Time Delayed Overcurrent
2.9.1 Reference
Parameter
Value
Is
Setting
0.05, 0.1… 2.5 xIn
char
Characteristic setting
IEC-NI, -VI, -EI, -LTI; ANSI-MI, -VI, -EI; DTL
Tm
Time Multiplier setting
0.025, 0.05… 1.6
td
Delay setting
0, 0.01… 20 s
tres
Reset setting
ANSI DECAYING, 0, 1… 60 s
2.9.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
105 % Is, r 4 % or r 1% In
Reset level
t 95 % Iop
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 26 of 45
7SR242 Duobias Performance Specification
2.9.3 Operate and Reset Time
Attribute
Value
Starter operate time (t 2xIs)
20 ms, r 20ms
t op
char = IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
top
char = DTL
t op
ANSI DECAYING
ª
«
«
¬
u Tm , r 5 % absolute or r 30 ms,
IEC-NI :
IEC-VI :
IEC-EI :
IEC-LTI :
A
>IsI @P
K = 0.14, D = 0.02
K = 13.5, D = 1.0
K = 80.0, D = 2.0
K = 120.0, D = 1.0
º
B » u Tm , r 5 % absolute or r 30 ms,
»
1
¼
for char = ANSI-MI : A = 0.0515, B = 0.114, P = 0.02
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2, B = 0.1217, P = 2.0
td, r 1 % or r 20ms
t res
Reset time
>IsI @D 1
for char =
Operate time
char = ANSI-MI,
ANSI-VI,
ANSI-EI
K
R
>@
I 2
Is
1
u Tm ,
r 5 % absolute or r 30 ms,
for char = ANSI-MI : R = 4.85
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
tres
tres, r 1 % or r 20ms
Repeatability
r 1 % or r 20ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
Figure 2-2 shows the operate times for the four IEC IDMTL curves with a time multiplier of 1.
Figure 2-3 and figure 2.4 show the ANSI operate and reset curves. These operate times apply to non-directional
characteristics. Where directional control is applied then the directional element operate time should be added to
give total maximum operating time.
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 27 of 45
7SR242 Duobias Performance Specification
2.10 51N Time Delayed Derived Earth Fault
2.10.1 Reference
Parameter
Value
Is
Setting
0.05, 0.1… 2.5 xIn
char
Characteristic setting
IEC-NI, -VI, -EI, -LTI; ANSI-MI, -VI, -EI; DTL
Tm
Time Multiplier setting
0.025, 0.05… 1.6
td
Delay setting
0, 0.01… 20 s
tres
Reset setting
ANSI DECAYING, 0, 1… 60 s
2.10.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
105 % Is, r 4 % or r 1% In
Reset level
t 95 % Iop
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 28 of 45
7SR242 Duobias Performance Specification
2.10.3 Operate and Reset Time
Attribute
Value
Starter operate time (t 2xIs)
20 ms, r 20ms
t op
char = IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
top
char = DTL
t op
ANSI DECAYING
ª
«
«
¬
u Tm , r 5 % absolute or r 30 ms,
IEC-NI :
IEC-VI :
IEC-EI :
IEC-LTI :
A
>IsI @P
K = 0.14, D = 0.02
K = 13.5, D = 1.0
K = 80.0, D = 2.0
K = 120.0, D = 1.0
º
B » u Tm , r 5 % absolute or r 30 ms,
»
1
¼
for char = ANSI-MI : A = 0.0515, B = 0.114, P = 0.02
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2, B = 0.1217, P = 2.0
td, r 1 % or r 20ms
t res
Reset time
>IsI @D 1
for char =
Operate time
char = ANSI-MI,
ANSI-VI,
ANSI-EI
K
R
>@
I 2
Is
1
u Tm ,
r 5 % absolute or r 30 ms,
for char = ANSI-MI : R = 4.85
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
tres
tres, r 1 % or r 20ms
Repeatability
r 1 % or r 20ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
Figure 2-2 shows the operate times for the four IEC IDMTL curves with a time multiplier of 1.
Figure 2-3 and figure 2.4 show the ANSI operate and reset curves. These operate times apply to non-directional
characteristics. Where directional control is applied then the directional element operate time should be added to
give total maximum operating time.
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 29 of 45
7SR242 Duobias Performance Specification
2.11 51G Time Delayed Measured Earth Fault
2.11.1 Reference
Parameter
Value
Is
Setting
0.005, 0.10… 1.0 xIn
Char
Characteristic setting
IEC-NI, -VI, -EI, -LTI; ANSI-MI, -VI, -EI; DTL
Tm
Time Multiplier setting
0.025, 0.05… 1.6
td
Delay setting (DTL)
0, 0.01… 20 s
tres
Reset setting
ANSI DECAYING, 0, 1… 60 s
I
Applied current (for
operate time)
IDMTL
2 to 20 xIs
DTL
5 xIs
2.11.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
105 % Is, r 4 % or r 1% In
Reset level
t 95 % Iop
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 30 of 45
7SR242 Duobias Performance Specification
2.11.3 Operate and Reset Time
Attribute
Value
Starter operate time (t 2xIs)
20 ms, r 20ms
t op
char = IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
top
char = DTL
t op
ANSI DECAYING
ª
«
«
¬
u Tm , r 5 % absolute or r 30 ms,
IEC-NI :
IEC-VI :
IEC-EI :
IEC-LTI :
A
>IsI @P
K = 0.14, D = 0.02
K = 13.5, D = 1.0
K = 80.0, D = 2.0
K = 120.0, D = 1.0
º
B » u Tm , r 5 % absolute or r 30 ms,
»
1
¼
for char = ANSI-MI : A = 0.0515, B = 0.114, P = 0.02
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2, B = 0.1217, P = 2.0
td, r 1 % or r 20ms
t res
Reset time
>IsI @D 1
for char =
Operate time
char = ANSI-MI,
ANSI-VI,
ANSI-EI
K
R
>@
I 2
Is
1
u Tm ,
r 5 % absolute or r 30 ms,
for char = ANSI-MI : R = 4.85
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
tres
tres, r 1 % or r 20ms
Repeatability
r 1 % or r 20ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
Figure 2-2 shows the operate times for the four IEC IDMTL curves with a time multiplier of 1.
Figure 2-3 and figure 2.4 show the ANSI operate and reset curves. These operate times apply to non-directional
characteristics. Where directional control is applied then the directional element operate time should be added to
give total maximum operating time.
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 31 of 45
7SR242 Duobias Performance Specification
1000
100
Time
(sec)
10
Long Time Inverse
Normal Inverse
1
Very Inverse
Extremely Inverse
0.1
1
2
3
4
5
6
8
10
20
30
40
50 60
80
100
Current (multiples of setting)
Figure 2-2
IEC IDMTL Curves (Time Multiplier=1)
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 32 of 45
7SR242 Duobias Performance Specification
1000
100
Time
(sec)
10
Moderately Inverse
1
Very Inverse
Extremely Inverse
0.1
1
2
3
4
5
6
8
10
20
30
40
50 60
80
100
Current (multiples of setting)
Figure 2-3
ANSI IDMTL Operate Curves (Time Multiplier=1)
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 33 of 45
7SR242 Duobias Performance Specification
1000
500
100
50
Extremely Inverse
Very Inverse
Time
(sec)
10
Moderately Inverse
5
1
0.1
0.2
0.3
0.4
0.5
0.6
0.7 0.8 0.9 1
Current (multiples of setting)
Figure 2-4
ANSI Reset Curves (Time Multiplier=1)
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 34 of 45
7SR242 Duobias Performance Specification
2.12 59N Neutral Voltage Displacement
2.12.1 Reference (59NDT)
Parameter
Value
Vs
Setting
1, 1.5… 100V
td
Delay setting
0.00, 0.01…20.00, 20.50… 100, 101… 1000, 1010… 10000,
10100… 14400 s
2.12.2 Operate and Reset Level (59NDT)
Vop
Attribute
Value
Operate level
100 % Vs, r 2 % or r 0.5 V
Reset level
t 95 % Vop
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.12.3 Operate and Reset Time (59NDT)
Attribute
Value
0V to 1.5 xVs, 76 ms, r 20ms
tbasic
Element basic operate time
top
Operate time following delay
tbasic + td, r 1 % or r 20ms
Repeatability
r 1 % or r 20ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
0V to 10 xVs, 63 ms, r 20ms
2.12.4 Reference (59NIT)
Parameter
Value
M
Multiplier setting
0.1, 0.2… 10, 10.5… 140
Vs
Setting
1, 1.5… 100V
td
Delay setting
0, 0.01… 20 s
tres
Reset setting
0, 1…60 s
2.12.5 Operate and Reset Level (59NIT)
Vop
Attribute
Value
Operate level
105 % Vs, r 2 % or r 0.5 V
Reset level
t 95 % Vop
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 35 of 45
7SR242 Duobias Performance Specification
2.12.6 Operate and Reset Time (59NIT)
tbasic
top
Attribute
Value
Starter operate time (t 2xVs)
65 ms, r 20ms
Operate
time
Reset Time
char = IDMTL
t op
M
> @1
3V0
Vs
, r 5 % or r 65 ms
char = DTL
td, r 1 % or r 40ms
char = IDMTL
tres, r 5 % or r 65ms
char = DTL
tres, r 1 % or r 40ms
Repeatability
r 1 % or r 20ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 36 of 45
7SR242 Duobias Performance Specification
2.13 64H Restricted Earth Fault Protection
2.13.1 Reference
Parameter
Value
Is
Setting
0.005, 0.010… 0.95 xIn
td
Delay setting
0.00, 0.01… 20.0, 20.1… 100.0, 101.…1000, 1010 …
10000 , 10100 … 14400 s
2.13.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
100 % Is, r 5 % or r1% xIn
Reset level
95 % Iop, r 5 % or r0.1% xIn
Repeatability
r1%
Transient overreach
(X/R d 100)
d -5 %
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
2.13.3 Operate and Reset Time
Attribute
Value
0 to 2 xIs, 40 ms, r 10ms
tbasic
Element basic operate time
top
Operate time following delay
tbasic + td, r 1% or r 10ms
Repeatability
r 1% or r 10ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
©2010 Siemens Protection Devices Limited
0 to 5 xIs, 30 ms, r 10ms
Chapter 3 - Page 37 of 45
7SR242 Duobias Performance Specification
2.14 81Under/Over Frequency
2.14.1 Reference
Parameter
Value
Fs
Setting
40, 40.01… 69.99 Hz
Hyst
Hysteresis setting
0, 0.1… 80%
td
Delay setting
0.00, 0.01… 20.0, 20.1… 100.0, 101.…1000, 1010 … 10000 ,
10100 … 14400 s
2.14.2 Operate and Reset Level
Fop
Attribute
Value
Operate level
100 % Fs, r 10mHz
Reset level
overfrequency
(100 % - hyst) xFop, r 10mHz
underfrequency
(100 % + hyst) xFop, r 10mHz
r1%
Repeatability
Variation
-10 °C to +55 °C
d5%
2.14.3 Operate and Reset Time
Attribute
Element basic
operate time
Value
overfrequency
Typically 110ms
Maximum 150ms
tbasic
(for ROCOF
between 0.1
underfrequency
and 5.0 Hz/sec)
Maximum 150ms
top
Operate time following delay
tbasic + td, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Disengaging time
100 ms
©2010 Siemens Protection Devices Limited
Typically 110ms
Chapter 3 - Page 38 of 45
7SR242 Duobias Performance Specification
2.15 87 Biased Differential
2.15.1 Reference
Parameter
Value
ICT
Multiplier
1.00x
Iinit
Initial Setting
0.1, 0.15… 2 xIn
IB1
IB1L
IB2
st
0.1, 0.15… 0.7 x
st
1, 2… 20 xIn
1 Bias Slope setting
1 Bias Slope Limit
nd
Bias Slope setting
1, 1.05… 2 x
nd
Bias Slope Type setting
Line, Curve
2
IB2T
2
ts
Delay setting
©2010 Siemens Protection Devices Limited
0, 0.005… 1s
Chapter 3 - Page 39 of 45
7SR242 Duobias Performance Specification
Operate and Reset Level
Attribute
Value
IOPERATE ! I 87 INITIAL SETTING and
IOPERATE ! M1 u IRESTRAIN and
IOPERATE ! M 2 u IRESTRAIN (for IRESTRAIN ! B)
Where
Operate level
I1 I 2
I OPERATE
2nd Bias Slope Type = Line
I1 I 2
IRESTRAIN
2
st
B = 87BD 1 Bias slope limit
IOP
M1 = 87BD 1st Bias slope
M2 = 87BD 2nd Bias slope
I OPERATE ! I 87 INITIAL SETTING and
I OPERATE ! M1 u IRESTRAIN and
Operate level
I OPERATE
2nd Bias Slope Type = Curve
2
IRESTRAIN
K2
!
(for IRESTRAIN ! B)
2
Where
K2 = B2 – 2M12B2
87BD Initial Setting
r 5% of setting or r 0.01In
87BD Bias Slope
r 10% of bias slope setting
Reset level
90% of IOP
Repeatability
r 2%
Transient overreach
5%
Variation
-10 °C to +55 °C
fnom - 3 Hz to fnom + 2 Hz
2.15.2 Operate Time
tbasic
top
Attribute
Value
Element basic operate time
0 to 3 x IOP, 35 ms, r 10ms
(Inrush Action: Enabled)
0 to 10 x IOP, 30 ms, r 10ms
Operate time following delay
tbasic + td, r 1% or r 10ms
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 40 of 45
7SR242 Duobias Performance Specification
2.16 87HS High-Set Differential
2.16.1 Reference
Parameter
Value
ICT
Multiplier
1.00x
Is
Setting
1, 2 … 30 xIn
ts
Delay setting
0, 0.005… 1s
2.16.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
r 5% of setting or r 0.01In
Reset level
95% of IOP
Repeatability
r 2%
Transient overreach
5%
Variation
-10 °C to +55 °C
fnom - 3 Hz to fnom + 2 Hz
2.16.3 Operate and Reset Time
Attribute
tbasic
Element basic operate time
top
Operate time following delay
©2010 Siemens Protection Devices Limited
Value
0 to 3 x IOP, 30 ms, r 10ms
0 to 5 x IOP, 25 ms, r 10ms
tbasic + td, r 1% or r 10ms
Chapter 3 - Page 41 of 45
7SR242 Duobias Performance Specification
Section 3: Supervision Functions
3.1
50BF Circuit Breaker Fail
3.1.1 Reference
Parameter
Value
Is
Setting: 50BF-n
0.050, 0.055… 2.0 xIn
Is
Setting: 50BF-n-I4
0.005, 0.010… 2.0 xIn
tCBF1
Stage 1 Delay setting
0, 5… 60000ms
tCBF2
Stage 2 Delay setting
0, 5… 60000ms
3.1.2 Operate and Reset Level
Attribute
Value
Iop
Operate level
100 % Is, r 5 % or r 1% In
Ireset
Reset level
100 % Iop, r 5 % or r 1% In
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
3.1.3 Operate and Reset Time
tbasic
top
Attribute
Value
Element basic operate time
< 20ms
Stage 1
tCBF1, r 1 % or r 20ms
Stage 2
tCBF2, r 1 % or r 20ms
Repeatability
r 1 % or r 20ms
Overshoot
< 2 x 20ms
Disengaging time
< 20ms
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 42 of 45
7SR242 Duobias Performance Specification
3.2
74TCS/CCS Trip/Close Circuit Supervision
3.2.1 Reference
td
Parameter
Value
Delay setting
0, 0.02…60 s
3.2.2 Operate and Reset Time
Attribute
Value
tbasic
Element basic operate time
30ms r 10ms
top
Operate time following delay
tbasic + td, r 1 % or r 10ms
Repeatability
r 1 % or r 10ms
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 43 of 45
7SR242 Duobias Performance Specification
3.3
81HBL2 Inrush Detector
3.3.1 Reference
Parameter
Value
Setting
I
(Ratio of 2nd Harmonic current to
0.10, 0.11... 0.5
Fundamental component current)
3.3.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
100 % I, r 4 % or r 1% In
Reset level
100 % Iop, r 4 % or r 1% In
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
3.3.3 Operate and Reset Time
tbasic
Attribute
Value
Element basic operate time
Will pick-up before operation of any protection element due
to magnetic inrush
Reset Time
Will operation until drop-off of any protection element due
to magnetic inrush
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 44 of 45
7SR242 Duobias Performance Specification
3.4
81HBL5 Overfluxing Detector
3.4.1 Reference
Parameter
Value
Setting
I
(Ratio of 5th Harmonic current to
0.10, 0.11... 0.5
Fundamental component current)
3.4.2 Operate and Reset Level
Iop
Attribute
Value
Operate level
100 % I, r 4 % or r 1% In
Reset level
100 % Iop, r 4 % or r 1% In
Repeatability
r1%
Variation
-10 °C to +55 °C
d5%
fnom - 3 Hz to fnom + 2 Hz
d5%
3.4.3 Operate and Reset Time
tbasic
Attribute
Value
Element basic operate time
Will pick-up before operation of any protection element due
to overfluxing
Reset Time
Will operation until drop-off of any protection element due
to overfluxing
©2010 Siemens Protection Devices Limited
Chapter 3 - Page 45 of 45
7SR242 Duobias Data Communications
7SR242 Duobias
Multi-Function 2-Winding Transformer Protection Relay
Document Release History
This document is issue 2010/02. The list of revisions up to and including this issue is:
2010/02
Document reformat due to rebrand
2010/02
Third issue. Software revision 2662H80001 R4c-3
2008/07
Second issue. Software revision 2662H80001R3d-2c.
2008/05
First issue
Software Revision History
2010/02
2662H80001 R4c-3
Revisions to: VT ratio settings, 87BD 1st bias slope limit setting
increments, CB fail function, LED CONFIG menu, DATA
STORAGE menu.
Added: Open circuit detection (46BC), CONTROL MODE
menu, Close circuit supervision (74CCS), Measured earth fault
undercurrent (37G), Pulsed output contacts.
2008/07
2662H80001R3d-2c.
Demand metering. Optional DNP3.0 data comms.
2008/05
2662H80001R3-2b
First Release
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Data Communications
Contents
Document Release History....................................................................................................................1
Software Revision History.....................................................................................................................1
Contents ..................................................................................................................................................2
Section 1: Introduction ..........................................................................................................................3
Section 2: Physical Connection............................................................................................................4
2.1 Communication ports ................................................................................................................5
2.1.1 USB Interface ...............................................................................................................5
2.1.2 RS485 Interface ...........................................................................................................6
2.1.3 Fibre Optic Interface.....................................................................................................7
Section 3: IEC 60870-5-103 Definitions ..............................................................................................11
3.1 Introduction .............................................................................................................................11
Section 4: Modbus Definitions............................................................................................................18
4.1 Introduction .............................................................................................................................18
Event Format.........................................................................................................................................24
Section 5: DNP3.0 Definitions .............................................................................................................25
5.1 Device Profile ..........................................................................................................................25
5.2 Implementation Table .............................................................................................................28
5.3 Point List .................................................................................................................................33
Section 6: Modems...............................................................................................................................41
6.1.1 Connecting a Modem to the Relay(s) ........................................................................41
6.1.2 Setting the Remote Modem .......................................................................................41
6.1.3 Connecting to the Remote Modem ............................................................................42
Section 7: Glossary..............................................................................................................................43
List of Figures
Figure 2-1
Figure 2-2
Figure 2-3
Figure 2-4
Figure 6-1
Communication to Front USB Port ......................................................................................5
Communication to Multiple Devices from Control System using RS485.............................6
Communication to Multiple Devices using Fibre-optic Ring Network ................................10
Communication to Multiple Devices from Control System and Laptop using
Fibre-optic Star Network ....................................................................................................10
Communication to Device using Sigma 4 and Modem......................................................42
©2010 Siemens Protection Devices Limited
Chapter 4 Page 2 of 43
7SR242 Duobias Data Communications
Section 1: Introduction
The relay data communication facility is compatible with control and automation systems, PCs running Reydisp
software can provide operational information, post-fault analysis, settings interrogation and editing facilities. This
section describes how to use the Communication Interface with a control system or interrogating computer.
Appropriate software within the control system or on the interrogating computer (e.g. Reydisp Evolution) is
required to access the interface.
This section specifies connection details and lists the events, commands and measurands available in the
IEC60870-5-103, Modbus RTU and optional DNP3.0 protocols.
For further information regarding the IEC60870-5-103 interface, reference should be made to the separate
Informative Communications Interface manual (reference 434/TM/5 available from www.siemens.com/energy).
The Communications Interface for dialogue communications by the Protection Engineer is provided by the
Reydisp Evolution software package, also available from the website, using the IEC60870-5-103 protocol.
©2010 Siemens Protection Devices Limited
Chapter 4 Page 3 of 43
7SR242 Duobias Data Communications
Section 2: Physical Connection
The relay provides one ‘Front’ USB communication interface (Com2) located on the fascia and one RS485
(Com1) located on the ‘Rear’. Optional Fibre optic ports can also be located on the rear. Access to the
communication settings is only available from the relay front fascia via the COMMUNICATIONS MENU
1.
Com2-USB: this port is used for IEC60870-5-103 (default setting) communication with Reydisp software.
MODBUS RTU or optional DNP3 are also available through Com 2.
An ASCII protocol, the main use of which is to allow firmware to be updated from the front connection, is
also available through this port.
2.
Com1-RS485: this port can be used for IEC60870-5-103, MODBUS RTU or optionally DNP3
communications to a substation SCADA or integrated control system or engineer remote access.
3.
Com3/Com4: Optional fibre optic ports located on the rear of the relay can be used for IEC60870-5-103,
MODBUS RTU or optional DNP3 communications to a substation SCADA or integrated control system or
engineer remote access.
SPDL can provide a range of interface devices, please refer to product portfolio catalogue.
Full details of the interface devices can be found by referring to the website www.siemens.com/energy.
©2010 Siemens Protection Devices Limited
Chapter 4 Page 4 of 43
7SR242 Duobias Data Communications
2.1
Communication ports
2.1.1
USB Interface
The USB communication port is connected using a standard USB cable with a type B connection to the relay and
type A to the PC.
The PC will require a suitable USB driver to be installed, this will be carried out automatically when the Reydisp
software is installed. When the Reydisp software is running with the USB cable connected to a device an
additional connection is shown. Connections to these devices are not shown when they are not connected.
The USB communication interface on the relay is labelled Com 2 and its associated settings are located in the
Data communications menu. To enable communication with Reydisp via the USB port the following setting
changes must be made from the relay fascia.
Setting name
Range
Default
Setting
Station Address
0 … 65534
0
0 - 254
COM2-USB Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, ASCII,
DNP3
IEC60870-5103
IEC608705-103
Figure 2-1
Notes
An address between 1 and
254 must be given to identify
the relay
Reydisp software is
compatible with IEC608705-103.
Communication to Front USB Port
©2010 Siemens Protection Devices Limited
Chapter 4 Page 5 of 43
7SR242 Duobias Data Communications
2.1.2
RS485 Interface
The RS485 communication port is located on the rear of the relay and can be connected using a suitable RS485
120 ohm screened twisted pair cable.
The RS485 electrical connection can be used in a single or multi-drop configuration. The RS485 master must
support and use the Auto Device Enable (ADE) feature. The last device in the connection must be terminated
correctly in accordance with the master device driving the connection. The relays are fitted with an internal
terminating resistor which can be connected between A and B by fitting an external wire loop between terminals
18 and 20 on the power supply module.
The maximum number of relays that can be connected to the bus is 64.
Each relay has an internal terminating resistor – this can be connected in circuit where necessary.
The following settings must be configured via the relay fascia when using the RS485 interface.
Setting name
Range
Default
Station Address
0 … 65534
0
OFF, IEC60870-5-103,
COM1-RS485 Protocol MODBUS-RTU, DNP3
COM1-RS485 Baud
Rate
COM1-RS485 Parity
Figure 2-2
IEC60870-5103
Setting
Notes
An address between 1 and
254 must be given to identify
the relay. Each relay must
have a unique address.
Sets the protocol used to
As Required communicate on the RS485
connection.
0 - 65534
75 110 150 300 600 1200
2400 4800 9600 19200
19200
38400
The baud rate set on all of
the relays connected to the
As Required same RS485 bus must be
the same as the one set on
the master device.
NONE, ODD, EVEN
The parity set on all of the
relays connected to the
As Required same RS485 bus must be
the same and in accordance
with the master device.
EVEN
Communication to Multiple Devices from Control System using RS485
©2010 Siemens Protection Devices Limited
Chapter 4 Page 6 of 43
7SR242 Duobias Data Communications
2.1.3
Fibre Optic Interface
When connecting via the optional fibre optic interface the selection of fibre-optic cable is important. Fibres must
be terminated with STTM (BFOC/2.5) connectors.
The recommended type is 62.5/125μm glass fibre. Communication distances over 1 km are achievable using this
type of fibre.
The fibre optic data comms link will be interrupted if the relay element is withdrawn from the case.
A budget loss calculation should be made for all installations. The following table gives the launch power and
receiver sensitivity of each of the fibre optic communication ports on the Argus M relay when used with specific
fibre optic types.
Fibre Type
Tx Launch Power (dB)
RX Receive Sensitivity (dB)
Min
Max
Min
Max
62.5/125μm
-11.7
-15.7
-24
-9.2
1mm Polymer
-6.4
-10.4
-24
-9.2
200μm PCS
-2.8
-6.8
-24
-9.2
Factors to be considered when calculating fibre-optic transmission distances:
x
Transmitter launch power
x
Attenuation, based on light frequency, fibre material and fibre diameter
x
Number of intermediate connectors and splices
x
Receiver sensitivity
x
The light power at the receiver must be above the sensitivity of the receiver in order that effective
communication can occur.
x
Fibre cables are supplied on reels of finite length which may necessitate additional jointing.
x
Typical losses at connectors are 0.5-1.0dB each. This allows for normal age related deterioration.
Consult manufacturers data for actual values.
x
Typical Splice losses are <0.3dB.
x
A 3dB safety margin is usually allowed after the budget calculation is performed.
Following installation and prior to putting into service the actual losses should be measured for each fibre using a
calibrated light source and meter. Measured and calculated values can be compared.
©2010 Siemens Protection Devices Limited
Chapter 4 Page 7 of 43
7SR242 Duobias Data Communications
The following table can be used to record budget calculations:
A
Launch power
dB
B
Fibre Type
C
Loss (dB/km)
dB/km
D
Length
km
E
Total fibre loss (CxD)
dB
F
No. of Splices
G
Loss at each splice
dB
H
Total loss at splices (FxG)
dB
I
No. of connectors
J
Loss per connector
dB
K
Total loss at connectors (IxJ)
dB
L
Total losses (E+H+K)
dB
M
Receive power budget (A-L)
dB
N
Safety Margin
dB
O
Device Receive Sensitivity
dB
There are two optional fibre optic ports, Com3 and Com4, and when fitted the associated settings are available in
the Data Communication menu. To allow communication using either or both of these ports the relay settings
must be changed, via the fascia, in accordance with the method of connection and master device.
©2010 Siemens Protection Devices Limited
Chapter 4 Page 8 of 43
7SR242 Duobias Data Communications
Setting name
Range
Default
Station Address
0 … 65534
0
COM3 Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, DNP3
IEC60870-5103
COM3 Baud Rate
75 110 150 300 600 1200
2400 4800 9600 19200
57600
38400 57600, 115200
The baud rate set on all of
the relays connected to the
As Required same system must be the
same as the one set on the
master device.
COM3 Parity
NONE, ODD, EVEN
EVEN
The parity set on all of the
relays connected to the
same fibre optic system
As Required
must be the same and in
accordance with the master
device.
COM3 Line Idle
LIGHT ON, LIGHT OFF
LIGHT OFF
Sets the idle state of the line
As Required in accordance with master
device
COM3 Data Echo
ON,OFF
OFF
Set to ON when relays are
As Required connected in a ring
configuration.
COM4 Protocol
OFF, IEC60870-5-103,
MODBUS-RTU, DNP3
IEC60870-5103
Sets the protocol used to
As Required communicate on the fibre
optic connection – Com4.
COM4 Baud Rate
75 110 150 300 600 1200
2400 4800 9600 19200
57600
38400
The baud rate set on all of
the relays connected to the
As Required same system must be the
same as the one set on the
master device.
COM4 Parity
NONE, ODD, EVEN
EVEN
The parity set on all of the
relays connected to the
same fibre optic system
As Required
must be the same and in
accordance with the master
device.
COM4 Line Idle
LIGHT ON, LIGHT OFF
LIGHT OFF
Sets the idle state of the line
As Required in accordance with master
device
COM4 Data Echo
ON,OFF
OFF
Set to ON when relays are
As Required connected in a ring
configuration.
©2010 Siemens Protection Devices Limited
Setting
Notes
An address between 1 and
254 must be given to identify
the relay
Sets the protocol used to
As Required communicate on the fibre
optic connection – Com3
1 – 65534
Chapter 4 Page 9 of 43
7SR242 Duobias Data Communications
Rx
Rx
Tx
Tx
RS232 to Fibre
Optic Converter
RS232 straight
through cable
Computer or
Control System
USB or 9 pin male
D connector
25 pin male
D connector
Tx
Rx
Rx
Tx
62.5/125µm fibre optic with ST
connectors
Figure 2-3
Communication to Multiple Devices using Fibre-optic Ring Network
Figure 2-4
Communication to Multiple Devices from Control System and Laptop using Fibre-optic Star Network
©2010 Siemens Protection Devices Limited
Chapter 4 Page 10 of 43
7SR242 Duobias Data Communications
Section 3: IEC 60870-5-103 Definitions
3.1
Introduction
This section describes the IEC 60870-5-103 protocol implementation in the relays. This protocol is used for the
communication with REYDISP software and can also be used for communication with a suitable control system.
The control system or local PC acts as the master in the system with the relay operating as a slave responding to
the master’s commands. The implementation provides event information, time synchronising, commands and
measurands and also supports the transfer of disturbance records.
This protocol can be set to use any or all of the relays hardware interfaces (USB, Fibre Optic and RS485) and is
the standard protocol used by the USB port. The relay can communicate simultaneously on all ports regardless
of protocol used.
Each relay must be given an address to enable communication and can be set by the Communication
Interface:Relay Address. Valid settings are within the range 1 – 254, a relay with the default address of 0 will not
be able to communicate.
Cause of Transmission
The cause of transmission (COT) column of the ‘Information Number and Function’ table lists possible causes of
transmission for these frames. The following abbreviations are used:
Abbreviation
Description
SE
spontaneous event
T
test mode
GI
general interrogation
Loc
local operation
Rem
remote operation
Ack
command acknowledge
Nak
Negative command acknowledge
Note: Events listing a GI cause of transmission can be raised and cleared; other events are raised only.
Function Type
Abbreviation
Description
1
Time tagged message (monitor direction)
2
Time tagged message (relative time) (monitor direction)
3.1
Measurands I
4
Time-tagged measurands with relative time
5
Identification message
6
Time synchronisation
7
General Interrogation Initialization
9
Measurands II
20
General command
Information Number and Function
The following table lists information number and function definitions together with a description of the message
and function type and cause of transmission that can result in that message. Definitions with shaded area are not
available on all relay models.
©2010 Siemens Protection Devices Limited
Chapter 4 Page 11 of 43
7SR242 Duobias Data Communications
Function
Informatio
Description
n Number
Function
Type
Cause of Transmission
60
4
Remote Mode
1
SE, GI,
60
5
Service Mode
1
SE, GI,
60
6
Local Mode
1
SE, GI,
60
7
Local & Remote Mode
1
SE, GI,
60
12
Control Received
1
SE
60
13
Command Received
1
SE
60
128
Cold Start
1
SE
60
129
Warm Start
1
SE
60
130
Re-start
1
SE
60
135
Trigger Storage
1
SE
60
136
Clear Waveform Records
1
SE
60
137
Clear Fault Records
1
SE
60
138
Clear Event Records
1
SE
60
140
Demand metering reset
1
SE
60
170
General Alarm 1
1
SE, GI,
60
171
General Alarm 2
1
SE, GI,
60
172
General Alarm 3
1
SE, GI,
60
173
General Alarm 4
1
SE, GI,
60
174
General Alarm 5
1
SE, GI,
60
175
General Alarm 6
1
SE, GI,
60
176
General Alarm 7
1
SE, GI,
60
177
General Alarm 8
1
SE, GI,
60
178
General Alarm 9
1
SE, GI,
60
179
General Alarm 10
1
SE, GI,
60
180
General Alarm 11
1
SE, GI,
60
181
General Alarm 12
1
SE, GI,
60
182
Quick Logic E1
1
SE, GI,
60
183
Quick Logic E2
1
SE, GI,
60
184
Quick Logic E3
1
SE, GI,
60
185
Quick Logic E4
1
SE, GI,
60
186
Quick Logic E5
1
SE, GI,
60
187
Quick Logic E6
1
SE, GI,
60
188
Quick Logic E7
1
SE, GI,
60
189
Quick Logic E8
1
SE, GI,
60
190
Quick Logic E9
1
SE, GI,
60
191
Quick Logic E10
1
SE, GI,
60
192
Quick Logic E11
1
SE, GI,
60
193
Quick Logic E12
1
SE, GI,
60
194
Quick Logic E13
1
SE, GI,
60
195
Quick Logic E14
1
SE, GI,
60
196
Quick Logic E15
1
SE, GI,
60
197
Quick Logic E16
1
SE, GI,
70
5
Binary Input 5
1
SE, GI,
70
6
Binary Input 6
1
SE, GI,
70
7
Binary Input 7
1
SE, GI,
70
8
Binary Input 8
1
SE, GI,
70
9
Binary Input 9
1
SE, GI,
70
10
Binary Input 10
1
SE, GI,
©2010 Siemens Protection Devices Limited
Chapter 4 Page 12 of 43
7SR242 Duobias Data Communications
Function
Informatio
Description
n Number
Function
Type
Cause of Transmission
70
11
Binary Input 11
1
SE, GI,
70
12
Binary Input 12
1
SE, GI,
70
13
Binary Input 13
1
SE, GI,
70
14
Binary Input 14
1
SE, GI,
70
15
Binary Input 15
1
SE, GI,
70
16
Binary Input 16
1
SE, GI,
70
17
Binary Input 17
1
SE, GI,
70
18
Binary Input 18
1
SE, GI,
70
19
Binary Input 19
1
SE, GI,
1
SE, GI,
80
1
Binary Output 1
80
2
Binary Output 2
80
3
Binary Output 3
80
4
Binary Output 4
80
80
5
6
Binary Output 5
Binary Output 6
80
7
Binary Output 7
80
8
Binary Output 8
80
9
Binary Output 9
80
80
10
11
Binary Output 10
Binary Output 11
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
1
SE, GI,
20
Ack, Nak
5
Reset FCB
80
12
Binary Output 12
80
13
Binary Output 13
80
14
Binary Output 14
176
2
Reset FCB
176
3
Reset CU
5
Reset CU
176
4
Start/Restart
5
Start/Restart
176
5
Power On
176
19
LEDs reset (Reset Flag & Outputs)
176
22
Settings changed
176
23
Settings Group 1 Select
176
24
Settings Group 2 Select
176
25
Settings Group 3 Select
©2010 Siemens Protection Devices Limited
5
SE
1
SE
20
Ack, Nak
1
SE
1
SE, GI
20
Ack, Nak
1
SE, GI
20
Ack, Nak
1
SE, GI
20
Ack, Nak
Chapter 4 Page 13 of 43
7SR242 Duobias Data Communications
Function
Informatio
Description
n Number
Function
Type
Cause of Transmission
1
SE, GI
20
Ack, Nak
Binary Input 1
1
SE, GI
28
Binary Input 2
1
SE, GI
29
Binary Input 3
1
SE, GI
176
30
Binary Input 4
1
SE, GI
176
36
Trip circuit fail
1
SE, GI
176
64
Starter/Pick Up L1
1
SE, GI
176
65
Starter/Pick Up L2
1
SE, GI
176
66
Starter/Pick Up L3
1
SE, GI
176
26
Settings Group 4 Select
176
27
176
176
176
67
Starter/Pick Up N
1
SE, GI
176
68
General Trip
2
SE
176
69
Trip L1
2
SE
176
70
Trip L2
2
SE
176
71
Trip L3
2
SE
176
84
General Starter/Pick Up
1
SE, GI
176
85
Circuit breaker fail
2
SE
176
90
Trip I>
2
SE
176
91
Trip I>>
2
SE
176
92
Trip In>
2
SE
176
93
Trip In>>
2
SE
177
8
87BD
2
SE, GI
177
9
87HS
2
SE, GI
177
10
51-1
2
SE, GI
177
11
50-1
2
SE, GI
177
12
51N-1
2
SE, GI
177
13
50N-1
2
SE, GI
177
14
51G-1
2
SE, GI
177
15
50G-1
2
SE, GI
177
16
51-2
2
SE, GI
177
17
50-2
2
SE, GI
177
18
51N-2
2
SE, GI
177
19
50N-2
2
SE, GI
177
20
51G-2
2
SE, GI
177
21
50G-2
2
SE, GI
177
26
51G-3
2
SE, GI
177
32
51G-4
2
SE, GI
177
34
50BF-1-1
2
SE, GI
177
35
50BF-1-2
2
SE, GI
177
36
50BF-2-1
2
SE, GI
177
37
50BF-2-2
2
SE, GI
177
38
Thermal Alarm
2
SE, GI
177
39
Thermal Trip
2
SE, GI
177
41
46IT-1
2
SE, GI
177
42
46DT-1
2
SE, GI
SE, GI
177
43
46IT-2
2
177
44
46DT-2
2
SE, GI
177
45
64H-1
2
SE, GI
177
46
64H-2
2
SE, GI
177
48
37-1
2
SE, GI
©2010 Siemens Protection Devices Limited
Chapter 4 Page 14 of 43
7SR242 Duobias Data Communications
Function
Informatio
Description
n Number
Function
Type
Cause of Transmission
177
48
37-2
2
SE, GI
177
52
27/59-1
2
SE, GI
177
53
27/59-2
2
SE, GI
177
54
27/59-3
2
SE, GI
177
55
27/59-4
2
SE, GI
177
56
59NIT
2
SE, GI
177
57
59NDT
2
SE, GI
177
58
81-1
2
SE, GI
177
59
81-2
2
SE, GI
177
60
81-3
2
SE, GI
177
61
81-4
2
SE, GI
177
62
81-5
2
SE, GI
177
63
81-6
2
SE, GI
177
64
24DT-1
2
SE, GI
177
65
24DT-2
2
SE, GI
177
66
24IT
2
SE, GI
177
67
Trip Circuit Fail 1
2
SE, GI
177
68
Trip Circuit Fail 2
2
SE, GI
177
69
Trip Circuit Fail 3
2
SE, GI
177
70
Trip Circuit Fail 4
2
SE, GI
177
71
Trip Circuit Fail 5
2
SE, GI
177
72
Trip Circuit Fail 6
2
SE, GI
1
SE, GI
177
177
77
78
Settings Group 5 Selected
Settings Group 6 Selected
177
79
Settings Group 7 Selected
177
80
Settings Group 8 Selected
20
Ack, Nak
1
SE, GI
20
Ack, Nak
1
SE, GI
20
Ack, Nak
1
SE, GI
Ack, Nak
20
177
83
CB 1 Total Trip Count
1
SE, GI
177
84
CB 1 Delta Trip Count
1
SE, GI
177
86
Reset CB 1 Total Trip Count
1
SE, GI
20
Ack, Nak
1
SE, GI
20
Ack, Nak
177
87
Reset CB 1 Delta Trip Count
177
89
I2t CB 1 Wear
1
SE, GI
1
SE, GI
20
Ack, Nak
1
SE, GI
177
90
Reset I2t CB 1 Wear
177
91
I2t CB 2 Wear
177
92
Reset I2t CB 2 Wear
177
93
CB 2 Total Trip Count
177
94
CB 2 Delta Trip Count
177
177
96
Reset CB 2 Total Trip Count
1
SE, GI
20
Ack, Nak
1
SE, GI
1
SE, GI
1
SE, GI
20
Ack, Nak
1
SE, GI
20
Ack, Nak
97
Reset CB 2 Delta Trip Count
177
99
81HBL2
2
SE, GI
177
100
81HBL5
2
SE, GI
©2010 Siemens Protection Devices Limited
Chapter 4 Page 15 of 43
7SR242 Duobias Data Communications
Function
Informatio
Description
n Number
Function
Type
Cause of Transmission
177
101
CB 1 Total Trip Count
2
177
102
CB 1 Delta Trip Count
2
SE, GI
SE, GI
177
103
37G-1
2
SE, GI
177
104
37G-2
2
SE, GI
177
105
Close CB1
2
SE, GI
177
106
CB1 Fail To Close
2
SE, GI
177
107
CB1 DBI
2
SE, GI
177
108
Open CB1
2
SE, GI
177
109
CB1 Fail To Open
2
SE, GI
177
110
Close CB2
2
SE, GI
177
111
CB2 Fail To Close
2
SE, GI
177
112
CB2 DBI
2
SE, GI
177
113
Open CB2
2
SE, GI
177
114
CB2 Fail To Open
2
SE, GI
177
115
Close Circuit Fail 1
2
SE, GI
177
116
Close Circuit Fail 2
2
SE, GI
177
117
Close Circuit Fail 3
2
SE, GI
177
118
Close Circuit Fail 4
2
SE, GI
177
119
Close Circuit Fail 5
2
SE, GI
177
120
Close Circuit Fail 6
2
SE, GI
177
125
CB1 Trip Time Alarm
2
SE, GI
177
126
CB2 Trip Time Alarm
2
SE, GI
177
127
E/F Out
2
SE, GI
177
128
CB 2 Total Trip Count
2
SE, GI
177
129
CB 2 Delta Trip Count
2
SE, GI
200
1
1
SE, GI
200
2
200
255
CB1
CB2
20
Ack, Nak
1
SE, GI
20
Ack, Nak
Blocked by Interlocking
1
255
0
GI Initiation
7
End of GI
255
0
GI End
8
End of GI
255
0
Time Synchronisation
6
Time Synchronisation
Functio
n Type
Cause of Transmission
Measurand
Functio Information
Description
n
Number
W1 IL1,2,3
178
230
IL1 (2.4 x)
IL2 (2.4 x)
IL3 (2.4 x)
W2 IL1,2,3
178
231
IL1 (2.4 x)
IL2 (2.4 x)
IL3 (2.4 x)
©2010 Siemens Protection Devices Limited
Chapter 4 Page 16 of 43
7SR242 Duobias Data Communications
V,f
178
V (1.2 x)
220
f (1.2 x)
Disturbance Recorder Actual Channel (ACC) Numbers
Function
183
183
ACC Number
0
Description
Global
1
W1 Ia
183
2
W1 Ib
183
3
W1 Ic
183
4
IG1
183
5
W2 Ia
183
6
W2 Ib
183
7
W2 Ic
183
8
IG2
183
9
Vx
©2010 Siemens Protection Devices Limited
Chapter 4 Page 17 of 43
7SR242 Duobias Data Communications
Section 4: Modbus Definitions
4.1
Introduction
This section describes the MODBUS-RTU protocol implementation in the relays.
communication with a suitable control system.
This protocol is used for
This protocol can be set to use the Fibre Optic and RS485 ports. The relay can communicate simultaneously on
all ports regardless of protocol used.
Each relay must be given an address to enable communication and can be set by the Communication
Interface:Relay Address. Valid settings are within the range 1 – 247, a relay with the default address of 0 will not
be able to communicate.
Definitions with shaded area are not available on all relay models.
Coils (Read Write Binary values)
Address
00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00100
00101
00102
00103
00104
00105
00106
00107
00108
00109
00110
00111
00112
00113
00114
00115
00116
00117
00118
00119
00120
00121
00122
00123
00124
Description
Binary Output 1
Binary Output 2
Binary Output 3
Binary Output 4
Binary Output 5
Binary Output 6
Binary Output 7
Binary Output 8
Binary Output 9
Binary Output 10
Binary Output 11
Binary Output 12
Binary Output 13
Binary Output 14
LED Reset (Write only location)
Settings Group 1
Settings Group 2
Settings Group 3
Settings Group 4
Settings Group 5
Settings Group 6
Settings Group 7
Settings Group 8
CB1
CB2
Reset CB1 Total Trip Count, write only location.
Reset CB1 Delta Trip Count, write only location.
Reset CB1 Lockout Trip Count, write only location.
Reset I^2t CB1 Wear, write only location.
Reset I^2t CB2 Wear, write only location.
Reset CB2 Total Trip Count, write only location.
Reset CB2 Delta Trip Count, write only location.
Reset CB2 Lockout Trip Count, write only location.
Demand Metering Reset
Local Mode
Remote Mode
Service Mode
Local & Remote Mode
E/F Out
©2010 Siemens Protection Devices Limited
Chapter 4 Page 18 of 43
7SR242 Duobias Data Communications
Inputs (Read Only Binary values)
Address
10001
10002
10003
10004
10005
10006
10007
10008
10009
10010
10011
10012
10013
10014
10015
10016
10017
10018
10019
10101
10102
10103
10104
10105
10106
10107
10108
10109
10110
10111
10120
10121
10122
10123
10124
10130
10131
10132
10133
10134
10135
10200
10201
10202
10203
10204
10205
10206
10207
10208
10209
10210
10220
10221
10223
10224
10230
10231
10233
10234
10242
10243
Description
Binary Input 1
Binary Input 2
Binary Input 3
Binary Input 4
Binary Input 5
Binary Input 6
Binary Input 7
Binary Input 8
Binary Input 9
Binary Input 10
Binary Input 11
Binary Input 12
Binary Input 13
Binary Input 14
Binary Input 15
Binary Input 16
Binary Input 17
Binary Input 18
Binary Input 19
General Start/Pick-up
General Trip
Start/Pick-up L1
Start/Pick-up L2
Start/Pick-up L3
Start/Pick-up N
Trip/Operation L1
Trip/Operation L2
Trip/Operation L3
Trip/Operation N
Trip Circuit Fail
LOCAL control allowed
REMOTE control allowed
SERVICE mode/non-operational
Local & Remote
Front Port OverRide
Trip Cct Fail 1
Trip Cct Fail 2
Trip Cct Fail 3
Trip Cct Fail 4
Trip Cct Fail 5
Trip Cct Fail 6
87 Operated A
87 Operated B
87 Operated C
87 Harmonic Detector A
87 Harmonic Detector B
87 Harmonic Detector C
87 Trip
87HS Operated A
87HS Operated B
87HS Operated C
87HS Trip
64REF-1 Operated
64REF-1 Starter
64REF-2 Operated
64REF-2 Starter
51G-1 Starter
51G-1 Operated
51G-2 Starter
51G-2 Operated
UVGuardBlock
27/59-1 Operated
©2010 Siemens Protection Devices Limited
Chapter 4 Page 19 of 43
7SR242 Duobias Data Communications
10244
10246
10247
10249
10250
10252
10253
10260
10261
10263
10264
10266
10267
10269
10270
10272
10273
10275
10276
10280
10281
10283
10284
10286
10287
10290
10291
10310
10311
10320
10321
10333
10334
10336
10337
12100
12101
12102
12103
12104
12105
12107
12108
12109
12110
12111
12112
12114
12115
12117
12118
12120
12121
12200
12201
12202
12203
12204
12205
12207
12208
12209
12210
12211
27/59-1 Starter
27/59-2 Operated
27/59-2 Starter
27/59-3 Operated
27/59-3 Starter
27/59-4 Operated
27/59-4 Starter
81-1 Operated
81-1 Starter
81-2 Operated
81-2 Starter
81-3 Operated
81-3 Starter
81-4 Operated
81-4 Starter
81-5 Operated
81-5 Starter
81-6 Operated
81-6 Starter
24DT-1 Operated
24DT-1 Starter
24DT-2 Operated
24DT-2 Starter
24IT Starter
24IT Operated
49 Trip
49 Alarm
50G-1 Operated
50G-1 Starter
50G-2 Operated
50G-2 Starter
51G-3 Starter
51G-3 Operated
51G-4 Starter
51G-4 Operated
51-1 Starter A
51-1 Starter B
51-1 Starter C
51-1 Operated A
51-1 Operated B
51-1 Operated C
50-1 Starter A
50-1 Starter B
50-1 Starter C
50-1 Operated A
50-1 Operated B
50-1 Operated C
51N-1 Starter
51N-1 Operated
50N-1 Starter
50N-1 Operated
51-1
50-1
51-2 Starter A
51-2 Starter B
51-2 Starter C
51-2 Operated A
51-2 Operated B
51-2 Operated C
50-2 Starter A
50-2 Starter B
50-2 Starter C
50-2 Operated A
50-2 Operated B
©2010 Siemens Protection Devices Limited
Chapter 4 Page 20 of 43
7SR242 Duobias Data Communications
12212
12214
12215
12217
12218
12120
12121
12400
12401
12402
12403
12405
12406
12407
12408
12410
12411
12412
12413
12414
12415
12416
12417
12418
12419
12500
12501
12502
12503
12504
12505
12506
12507
12508
12509
12510
12511
12512
12513
12514
12515
12516
12517
12518
12519
12520
12521
12522
12523
12524
12525
12526
12527
12528
12529
12530
12531
12532
12533
12534
12535
12536
12537
12538
50-2 Operated C
51N-2 Starter
51N-2 Operated
50N-2 Starter
50N-2 Operated
51-1
50-1
50BF-1 ReTrip
50BF-1 BackTrip
50BF-2 ReTrip
50BF-2 BackTrip
59NIT Starter
59NDT Starter
59NIT Operated
59NDT Operated
46IT-1 Starter
46IT-2 Starter
46IT-1 Operated
46IT-2 Operated
46DT-1 Operated
46DT-2 Operated
37-1 Starter
37-2 Starter
37-1 Operated
37-2 Operated
General Alarm 1
General Alarm 2
General Alarm 3
General Alarm 4
General Alarm 5
General Alarm 6
General Alarm 7
General Alarm 8
General Alarm 9
General Alarm 10
General Alarm 11
General Alarm 12
Quick Logic E1
Quick Logic E2
Quick Logic E3
Quick Logic E4
Quick Logic E5
Quick Logic E6
Quick Logic E7
Quick Logic E8
Quick Logic E9
Quick Logic E10
Quick Logic E11
Quick Logic E12
Quick Logic E13
Quick Logic E14
Quick Logic E15
Quick Logic E16
Quick Logic E17
Quick Logic E18
Quick Logic E19
Quick Logic E20
Quick Logic E21
Quick Logic E22
Quick Logic E23
Quick Logic E24
Quick Logic E25
Quick Logic E26
Quick Logic E27
©2010 Siemens Protection Devices Limited
Chapter 4 Page 21 of 43
7SR242 Duobias Data Communications
12539
12540
12541
12542
12543
12544
12545
12546
12547
12548
12549
12550
12551
12552
12553
12554
12555
12556
12557
12558
12559
12560
12561
12562
12563
12564
12565
12566
12567
12568
12569
12570
12571
12572
12573
12574
12575
12576
12577
12578
12579
12580
12581
12582
12583
12584
12585
Quick Logic E28
Quick Logic E29
Quick Logic E30
Quick Logic E31
Quick Logic E32
Close Circuit Fail 1
Close Circuit Fail 2
Close Circuit Fail 3
Close Circuit Fail 4
Close Circuit Fail 5
Close Circuit Fail 6
Close Circuit Fail 7
Close Circuit Fail 8
Close Circuit Fail 9
Close Circuit Fail 10
51-4
50-4
51N-4
50N-4
50G-4
60 CTS
46BC-1
46BC-2
CB1 Total Trip Count
CB1 Delta Trip Count
CB1 Lockout Trip Count
I^2t CB1 Wear
I^2t CB2 Wear
CB2 Total Trip Count
CB2 Delta Trip Count
CB2 Lockout Trip Count
81HBL2
81HBL5
37G-1
37G-2
Close CB1
CB1 Fail To Close
CB1 DBI Alarm
Open CB1
CB1 Fail To Open
Close CB2
CB2 Fail To Close
CB2 DBI Alarm
Open CB2
CB2 Fail To Open
CB1 Trip Time Alarm
CB2 Trip Time Alarm
©2010 Siemens Protection Devices Limited
Chapter 4 Page 22 of 43
7SR242 Duobias Data Communications
Registers
Address
30001
30002
30010
30012
30014
Format
1 Register
3
8 Registers
UINT16
UINT16
UINT16
30016
30018
Name
No.of Events In Store
Event Record
Number of Fault Records
Number of Event Records
Number of Waveform
Records
Number of CPU resets
Number of CPU warmstarts
30100
30102
30104
30106
30108
30110
30112
30114
30116
30118
30120
30122
Operate Ia
Operate Ib
Operate Ic
Restrain Ia
Restrain Ib
Restrain Ic
nd
W1 2 Harmonic Ia
W1 2nd Harmonic Ib
nd
W1 2 Harmonic Ic
nd
W2 2 Harmonic Ia
W2 2nd Harmonic Ib
W2 2nd Harmonic Ic
FP_32BITS_3DP1
1
FP_32BITS_3DP
FP_32BITS_3DP1
1
FP_32BITS_3DP
1
FP_32BITS_3DP
1
FP_32BITS_3DP
1
FP_32BITS_3DP
FP_32BITS_3DP1
1
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
Ia x Inom
30200
30202
30204
30206
30208
30210
Primary Ig-1
Secondary Ig-1
Nominal Ig-1
Primary Ig-2
Seondary Ig-2
Nominal Ig-2
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
1
FP_32BITS_3DP
Ig kA
Ig A
Ig x Inom
Ig kA
Ig A
Ig x Inom
30400
30402
30404
30406
Primary Voltage kV
Secondary Voltage V
Nominal Voltage xVn
Frequency Hz
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
30500
30502
30504
V/f Voltage xVn
V/f Value xVn/fn
V/f IDMTL Status %
FP_32BITS_3DP1
FP_32BITS_3DP1
1
FP_32BITS_3DP
30602
30603
30604
Thermal Status Ph A
Thermal Status Ph B
Thermal Status Ph C
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
31100
31102
31104
31106
31108
31110
31112
31114
31116
31118
31120
31122
31124
31126
31128
W1 Primary Ia
W1 Primary Ib
W1 Primary Ic
W1 Secondary Ia
W1 Secondary Ib
W1 Secondary Ic
W1 Nominal Ia
W1 Nominal Ib
W1 Nominal Ic
W1 Line Ia
W1 Line Ib
W1 Line Ic
W1 Relay Ia
W1 Relay Ib
W1 Relay Ic
FP_32BITS_3DP
1
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
1
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
1
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
1
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
31200
31202
31204
31206
W2 Primary Ia
W2 Primary Ib
W2 Primary Ic
W2 Secondary Ia
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
FP_32BITS_3DP1
©2010 Siemens Protection Devices Limited
Description
UINT16
UINT16
1
kV
V
X Vnom
%
%
%
1
kA
kA
kA
A
A
A
x Inom
x Inom
x Inom
kA
kA
kA
x Inom
x Inom
x Inom
1
kA
kA
kA
A
Chapter 4 Page 23 of 43
7SR242 Duobias Data Communications
Address
31208
31210
31212
31214
31216
31218
31220
31222
31224
31226
31228
Name
W2 Secondary Ib
W2 Secondary Ic
W2 Nominal Ia
W2 Nominal Ib
W2 Nominal Ic
W2 Line Ia
W2 Line Ib
W2 Line Ic
W2 Relay Ia
W2 Relay Ib
W2 Relay Ic
Format
FP_32BITS_3DP1
1
FP_32BITS_3DP
1
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
1
FP_32BITS_3DP
1
FP_32BITS_3DP
1
FP_32BITS_3DP
FP_32BITS_3DP1
FP_32BITS_3DP1
1
FP_32BITS_3DP
Description
A
A
x Inom
x Inom
x Inom
kA
kA
kA
x Inom
x Inom
x Inom
32400
32402
32404
32406
32408
32410
W1 I Phase A Max
W1 I Phase B Max
W1 I Phase C Max
W2 I Phase A Max
W2 I Phase B Max
W2 I Phase C Max
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
FP_32BITS_3DP
Max Current W1 Ia
Max Current W1 Ib
Max Current W1 Ic
Max Current W2 Ia
Max Current W2 Ib
Max Current W2 Ic
1) FP_32BITS_3DP: 2 registers - 32 bit fixed point, a 32 bit integer containing a value to 3 decimal places e.g. 50000 sent = 50.000
2) UINT16: 1 register - standard 16 bit unsigned integer
3) Sequence of 8 registers containing an event record. Read address 30002 for 8 registers (16 bytes), each read returns the earliest event record and removes it from the
internal store. Repeat this process for the number of events in the register 30001, or until no more events are returned. (the error condition exception code 2)
Holding Registers (Read Write values)
Address
40001
Description
Time Meter
Event Format
The format of the event record is defined by the zero byte. It signifies the type of record which is used to decode
the event information. The zero byte can be one of the following.
Type
1
2
4
Description
Event
Event with Relative Time
Measurand Event with Relative Time
©2010 Siemens Protection Devices Limited
Chapter 4 Page 24 of 43
7SR242 Duobias Data Communications
Section 5: DNP3.0 Definitions
5.1
Device Profile
The following table provides a “Device Profile Document” in the standard format defined in the DNP 3.0 Subset
Definitions Document. While it is referred to in the DNP 3.0 Subset Definitions as a “Document,” it is in fact a
table, and only a component of a total interoperability guide. The table, in combination with the Implementation
Table provided in Section 5.2 (beginning on page 28), and the Point List Tables provided in Section 5.3
(beginning on page 33), should provide a complete configuration/interoperability guide for communicating with a
device implementing the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library.
DNP V3.0
DEVICE PROFILE DOCUMENT
(Also see the DNP 3.0 Implementation Table in Section 5.2, beginning on page 28.)
Vendor Name:
Siemens Protection Devices Ltd.
Device Name:
7SR242, using the Triangle MicroWorks, Inc. DNP3 Slave Source Code Library, Version
3.
Highest DNP Level Supported:
Device Function:
For Requests:
Level 3
… Master
For Responses:
Level 3
7 Slave
Notable objects, functions, and/or qualifiers supported in addition to the Highest DNP Levels Supported (the
complete list is described in the attached table):
For static (non-change-event) object requests, request qualifier codes 07 and 08 (limited quantity), and 17 and
28 (index) are supported. Static object requests sent with qualifiers 07, or 08, will be responded with qualifiers
00 or 01.
Output Event Object 11 is supported.
Maximum Data Link Frame Size (octets):
Maximum Application Fragment Size (octets):
Transmitted: 256
Received
256
Maximum Data Link Re-tries:
Transmitted: 2048
Received
2048
Maximum Application Layer Re-tries:
… None
7 Fixed (3)
… Configurable from 0 to 65535
Requires Data Link Layer Confirmation:
7
…
None
Configurable
7 Never
… Always
… Sometimes
… Configurable as: Never, Only for multi-frame messages, or Always
Requires Application Layer Confirmation:
…
…
7
7
…
…
Never
Always
When reporting Event Data (Slave devices only)
When sending multi-fragment responses (Slave devices only)
Sometimes
Configurable as: “Only when reporting event data”, or “When reporting event data or multi-fragment
messages.”
©2010 Siemens Protection Devices Limited
Chapter 4 Page 25 of 43
7SR242 Duobias Data Communications
DNP V3.0
DEVICE PROFILE DOCUMENT
(Also see the DNP 3.0 Implementation Table in Section 5.2, beginning on page 28.)
Timeouts while waiting for:
Data Link Confirm:
Complete Appl. Fragment: 7
Application Confirm:
Complete Appl. Response: 7
… None
None
None
7
None
7 Fixed - 2sec
Fixed at ____
Fixed - 10sec
Fixed at ____
Variable
Variable
Variable
Variable
Configurable.
Configurable
Configurable.
Configurable
Others: Transmission Delay, (0 sec)
Select/Operate Arm Timeout, (5 sec)
Need Time Interval, (30 minutes)
Application File Timeout, (60 sec)
Unsolicited Notification Delay, (5 seconds)
Unsolicited Response Retry Delay, (between 3 – 9 seconds)
Unsolicited Offline Interval, (30 seconds)
Binary Change Event Scan Period, (Polled, Not Applicable)
Double Bit Change Event Scan Period, (Unsupported - Not Applicable)
Analog Change Event Scan Period, (Unsupported - Not Applicable)
Counter Change Event Scan Period, (Unsupported - Not Applicable)
Frozen Counter Change Event Scan Period, (Unsupported - Not Applicable)
String Change Event Scan Period, (Unsupported - Not Applicable)
Virtual Terminal Event Scan Period, (Unsupported - Not Applicable)
Sends/Executes Control Operations:
WRITE Binary Outputs
SELECT/OPERATE
DIRECT OPERATE
DIRECT OPERATE – NO ACK
7 Never
Never
Never
Never 7
Count > 1
Pulse On
Pulse Off
Latch On
Latch Off
7 Never
Never
Never
Never
Never
Always
Always
Always
Always
Always
7 Never
Never
Always
Always
Queue
Clear Queue
7
Always
7 Always
7 Always
Always
7
7
7
7
Sometimes
Sometimes
Sometimes
Sometimes
Configurable
Configurable
Configurable
Configurable
Sometimes
Sometimes
Sometimes
Sometimes
Sometimes
Configurable
Configurable
Configurable
Configurable
Configurable
Sometimes
Sometimes
Configurable
Configurable
Attach explanation if 'Sometimes' or 'Configurable' was checked for any operation.
Reports Binary Input Change Events when no
Reports time-tagged Binary Input Change Events
specific variation requested:
when no specific variation requested:
Never
Only time-tagged
Only non-time-tagged
7 Configurable to send one or the
other
Sends Unsolicited Responses:
Never
Configurable
Only certain objects
Sometimes (attach explanation)
7 ENABLE/DISABLE UNSOLICITED
Function codes supported
Default Counter Object/Variation:
7
7
No Counters Reported
Configurable
Default Object
Default Variation:
Point-by-point list attached
©2010 Siemens Protection Devices Limited
7
Never
Binary Input Change With Time
Binary Input Change With Relative Time
Configurable
Sends Static Data in Unsolicited Responses:
7
…
Never
When Device Restarts
When Status Flags Change
No other options are permitted.
Counters Roll Over at:
7
No Counters Reported
Configurable (attach explanation)
16 Bits
32 Bits
Other Value: _____
Point-by-point list attached
Chapter 4 Page 26 of 43
7SR242 Duobias Data Communications
DNP V3.0
DEVICE PROFILE DOCUMENT
(Also see the DNP 3.0 Implementation Table in Section 5.2, beginning on page 28.)
Sends Multi-Fragment Responses:
7 Yes
No
Configurable
Sequential File Transfer Support:
File Transfer Support
Append File Mode
Custom Status Code Strings
Permissions Field
File Events Assigned to Class
File Events Send Immediately
Multiple Blocks in a Fragment
Max Number of Files Open
©2010 Siemens Protection Devices Limited
Yes
7 No
Yes
Yes
Yes
Yes
Yes
Yes
7
7
7
7
7
7
No
No
No
No
No
No
0
Chapter 4 Page 27 of 43
7SR242 Duobias Data Communications
5.2
Implementation Table
The following table identifies which object variations, function codes, and qualifiers the Triangle MicroWorks, Inc.
DNP 3.0 Slave Source Code Library supports in both request messages and in response messages. For static
(non-change-event) objects, requests sent with qualifiers 00, 01, 06, 07, or 08, will be responded with qualifiers 00
or 01. Requests sent with qualifiers 17 or 28 will be responded with qualifiers 17 or 28. For change-event
objects, qualifiers 17 or 28 are always responded.
In the table below, text shaded as 00, 01 (start stop) indicates Subset Level 3 functionality (beyond Subset Level
2).
In the table below, text shaded as 07, 08 (limited qty) indicates functionality beyond Subset Level 3.
REQUEST
RESPONSE
(Library will parse)
(Library will respond with)
Function
Qualifier
Codes (dec) Codes (hex)
Function
Qualifier
Codes (dec) Codes (hex)
OBJECT
Object Variation
Number Number
1
0
Description
Binary Input – Any Variation
1
(read)
00, 01(start-sto
22
(assign 06(no range, o
class)
07, 08(limited q
17, 27, 28(inde
1
1
Binary Input
1
(read)
(default
–
see
note 1)
1
2
00, 01(start-sto 129
00, 01(start-sto
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 2)
17, 27, 28(inde
Binary Input with Status
1
(read)
00, 01(start-sto 129
00, 01(start-sto
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 2)
17, 27, 28(inde
2
0
Binary Input Change – Any
Variation
1
(read)
06(no range, o
07, 08(limited q
2
1
Binary Input Change without
Time
1
(read)
06(no range, o 129
17, 28 (index)
(response)
07, 08(limited q
130 (unsol.
resp)
2
2
Binary Input Change with
Time
1
(read)
06(no range, o 129
17, 28 (index)
(response)
07, 08(limited q
130 (unsol.
resp)
2
3
Binary Input Change with
Relative Time
1
(read)
17, 28 (index)
06(no range, o 129
(response)
07, 08(limited q
130 (unsol.
resp)
Binary Output – Any Variation 1
(read)
00, 01(start-sto
(default
–
see
note 1)
10
0
22
(assign 06(no range, o
class)
07, 08(limited q
17, 27, 28(inde
©2010 Siemens Protection Devices Limited
Chapter 4 Page 28 of 43
7SR242 Duobias Data Communications
REQUEST
RESPONSE
(Library will parse)
(Library will respond with)
Description
Function
Qualifier
Codes (dec) Codes (hex)
Function
Qualifier
Codes (dec) Codes (hex)
Binary Output
1
OBJECT
Object Variation
Number Number
10
1
(read)
00, 01(start-sto 129
00, 01(start-sto
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 1)
17, 27, 28(inde
10
2
Binary Output Status
1
(write
00, 01(start-sto
1
(read)
00, 01(start-sto 129
00, 01(start-sto
(response)
06(no range, o
17, 28(index –
(default
–
see
note 1)
11
11
0
1
(default
–
see
note 1)
07, 08(limited q
see note 2)
17, 27, 28(inde
Binary Output Change – Any
Variation
1
(read)
06(no range, o
07, 08(limited q
Binary Output Change without 1
Time
(read)
06(no range, o 129
17, 28 (index )
(response)
07, 08(limited q
130 (unsol.
resp)
(read)
06(no range, o 129
17, 28 (index )
(response)
07, 08(limited q
130 (unsol.
resp)
11
2
Binary Output Change with
Time
1
12
0
Control Relay Output Block
22
(assign 00, 01(start-sto
class)
06(no range, o
07, 08(limited q
17, 27, 28(inde
12
1
Control Relay Output Block
3
(select)
4 (operate)
17, 28 (index) 129
(response)
echo of
request
7(limited quant 129
(response)
echo of
request
00, 01(start-sto129
(response)
echo of
request
5 (direct op)
6(dir.
noack)
12
2
Pattern Control Block
3
op,
(select)
4 (operate)
5 (direct op)
6(dir.
noack)
12
3
Pattern Mask
3
op,
(select)
4 (operate)
5 (direct op)
6(dir.
noack)
©2010 Siemens Protection Devices Limited
op,
Chapter 4 Page 29 of 43
7SR242 Duobias Data Communications
REQUEST
RESPONSE
(Library will parse)
(Library will respond with)
Function
Qualifier
Codes (dec) Codes (hex)
Function
Qualifier
Codes (dec) Codes (hex)
OBJECT
Object Variation
Number Number
30
0
Description
Analog Input - Any Variation
1
(read)
00, 01(start-sto
22 (assign
class)
06(no range, o
07, 08(limited q
17, 27, 28(inde
30
1
32-Bit Analog Input
1
(read)
00, 01(start-sto
00, 01(start-sto 129
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 2)
17, 27, 28(inde
30
2
16-Bit Analog Input
1
(read)
00, 01(start-sto
00, 01(start-sto 129
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 2)
17, 27, 28(inde
30
3
(default
–
see
note 1)
30
4
32-Bit Analog Input without
Flag
1
(read)
00, 01(start-sto 129
00, 01(start-sto
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 2)
17, 27, 28(inde
16-Bit Analog Input without
Flag
1
(read)
00, 01(start-sto 129
00, 01(start-sto
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 2)
17, 27, 28(inde
30
5
short floating point
1
(read)
00, 01(start-sto 129
00, 01(start-sto
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 2)
17, 27, 28(inde
30
6
long floating point
1
(read)
00, 01(start-sto 129
00, 01(start-sto
(response)
06(no range, o
17, 28(index –
07, 08(limited q
see note 1)
17, 27, 28(inde
50
0
Time and Date
50
1
Time and Date
(default
–
see
note 1)
50
3
51
1
1
(read)
07, (limited qt 129
07 (limited qt
(response)
2
(write)
07(limited qty =
Time and Date Last Recorded 2
(write)
Time
Time and Date CTO
©2010 Siemens Protection Devices Limited
07(limited qty)
129
07(limited qty)
(response)
(qty = 1)
130 (unsol.
resp)
Chapter 4 Page 30 of 43
7SR242 Duobias Data Communications
REQUEST
RESPONSE
(Library will parse)
(Library will respond with)
Function
Qualifier
Codes (dec) Codes (hex)
Function
Qualifier
Codes (dec) Codes (hex)
OBJECT
Object Variation
Number Number
Description
51
2
Unsynchronized Time and
Date CTO
07(limited qty)
129
(response)
(qty = 1)
130 (unsol.
resp)
52
1
Time Delay Coarse
129
07(limited qty)
(response)
(qty = 1)
52
2
Time Delay Fine
129
07(limited qty)
(response)
(qty = 1)
60
0
Not Defined
60
1
Class 0 Data
1
(read)
06(no range, o
60
2
Class 1 Data
1
(read)
06(no range, o
07, 08(limited q
20
(enbl.
unsol.)
06(no range, o
21
(dab.
unsol.)
22 (assign
class)
60
3
Class 2 Data
1
(read)
06(no range, o
07, 08(limited q
20
(enbl.
unsol.)
06(no range, o
21
(dab.
unsol.)
22 (assign
class)
60
4
Class 3 Data
1
(read)
06(no range, o
07, 08(limited q
20
(enbl.
unsol.)
06(no range, o
21
(dab.
unsol.)
22 (assign
class)
80
1
Internal Indications
1
(read) 00, 01 (start- 129(respons 00, 01 (startstop)
stop)
2
(write)
(see note 3)
No Object (function code only)
13
(cold
restart)
No Object (function code only)
14
(warm
restart)
©2010 Siemens Protection Devices Limited
00 (start-stop)
index=7
Chapter 4 Page 31 of 43
7SR242 Duobias Data Communications
REQUEST
RESPONSE
(Library will parse)
(Library will respond with)
Function
Qualifier
Codes (dec) Codes (hex)
Function
Qualifier
Codes (dec) Codes (hex)
OBJECT
Object Variation
Number Number
Description
No Object (function code only)
23
(delay
meas.)
No Object (function code only)
24
(record
current time)
Note 1: A Default variation refers to the variation responded when variation 0 is requested and/or in class 0, 1, 2,
or 3 scans. Default variations are configurable; however, default settings for the configuration parameters are
indicated in the table above.
Note 2: For static (non-change-event) objects, qualifiers 17 or 28 are only responded when a request is sent with
qualifiers 17 or 28, respectively. Otherwise, static object requests sent with qualifiers 00, 01, 06, 07, or 08, will be
responded with qualifiers 00 or 01. (For change-event objects, qualifiers 17 or 28 are always responded.)
Note 3: Writes of Internal Indications are only supported for index 7 (Restart IIN1-7)
©2010 Siemens Protection Devices Limited
Chapter 4 Page 32 of 43
7SR242 Duobias Data Communications
5.3
Point List
The tables below identify all the default data points provided by the implementation of the Triangle MicroWorks,
Inc. DNP 3.0 Slave Source Code Library.
BinaryInput Points
The default binary input event buffer size is set to allow 100 events.
Note, not all points listed here apply to all builds of devices.
Binary Input Points
Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Static Variation reported when variation 0 requested: 2 (Binary Input 2 with status)
Change Event Variation reported when variation 0 requested: 3 (Binary Input Change with Relative Time)
Point Index
Name/Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Binary Input 1
Binary Input 2
Binary Input 3
Binary Input 4
Binary Input 5
Binary Input 6
Binary Input 7
Binary Input 8
Binary Input 9
Binary Input 10
Binary Input 11
Binary Input 12
Binary Input 13
Binary Input 14
Binary Input 15
Binary Input 16
Binary Input 17
Binary Input 18
Binary Input 19
Binary Input 20
Binary Input 21
Binary Input 22
Binary Input 23
Binary Input 24
Binary Input 25
Binary Input 26
Binary Input 27
Binary Input 28
Binary Input 29
Binary Input 30
Binary Input 31
Binary Input 32
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
34
35
36
37
38
Front port override
Remote mode
Service mode
Local mode
Local & Remote
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
41
Trip Circuit Fail
2
2
2
©2010 Siemens Protection Devices Limited
Default Class
Default Variation
Default Event Variation
Chapter 4 Page 33 of 43
7SR242 Duobias Data Communications
Binary Input Points
Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Static Variation reported when variation 0 requested: 2 (Binary Input 2 with status)
Change Event Variation reported when variation 0 requested: 3 (Binary Input Change with Relative Time)
Point Index
Name/Description
42
43
44
45
A-Starter
B-Starter
C-Starter
General Starter
2
2
2
2
2
2
2
2
2
2
2
2
49
Start/Pick-up N
2
2
2
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
87BD
87HS
51-1
50-1
51N-1
50N-1
51G-1
50G-1
51-2
50-2
51N-2
50N-2
51G-2
50G-2
51-3
50-3
51N-3
50N-3
51G-3
50G-3
51-4
50-4
51N-4
50N-4
51G-4
50G-4
50BF-1-1
50BF-1-2
50BF-2-1
50BF-2-2
49-Alarm
49-Trip
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
85
86
87
88
89
90
91
92
93
94
46IT-1
46DT-1
46IT-2
46DT-2
64H-1
64H-2
64H-3
37-1
37-2
46BC-1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
©2010 Siemens Protection Devices Limited
Default Class
Default Variation
Default Event Variation
Chapter 4 Page 34 of 43
7SR242 Duobias Data Communications
Binary Input Points
Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Static Variation reported when variation 0 requested: 2 (Binary Input 2 with status)
Change Event Variation reported when variation 0 requested: 3 (Binary Input Change with Relative Time)
Point Index
Name/Description
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
46BC-2
27/59-1
27/59-2
27/59-3
27/59-4
59NIT
59NDT
81-1
81-2
81-3
81-4
81-5
81-6
24DT-1
24DT-2
24IT
Trip Circuit Fail 1
Trip Circuit Fail 2
Trip Circuit Fail 3
Trip Circuit Fail 4
Trip Circuit Fail 5
Trip Circuit Fail 6
Trip Circuit Fail 7
Trip Circuit Fail 8
Trip Circuit Fail 9
Trip Circuit Fail 10
CB1 Total Trip Count
CB1 Delta Trip Count
CB1 Lockout trip Count
I^2t CB1 Wear
I^2t CB2 Wear
CB2 Total Trip Count
CB2 Delta Trip Count
CB2 Lockout trip Count
General Alarm 1
General Alarm 2
General Alarm 3
General Alarm 4
General Alarm 5
General Alarm 6
General Alarm 7
General Alarm 8
General Alarm 9
General Alarm 10
General Alarm 11
General Alarm 12
Quick Logic E1
Quick Logic E2
Quick Logic E3
Quick Logic E4
©2010 Siemens Protection Devices Limited
Default Class
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Default Variation
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Default Event Variation
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Chapter 4 Page 35 of 43
7SR242 Duobias Data Communications
Binary Input Points
Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Static Variation reported when variation 0 requested: 2 (Binary Input 2 with status)
Change Event Variation reported when variation 0 requested: 3 (Binary Input Change with Relative Time)
Point Index
Name/Description
145
146
147
148
149
150
151
152
153
154
155
156
Quick Logic E5
Quick Logic E6
Quick Logic E7
Quick Logic E8
Quick Logic E9
Quick Logic E10
Quick Logic E11
Quick Logic E12
Quick Logic E13
Quick Logic E14
Quick Logic E15
Quick Logic E16
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
81HBL2
81HBL5
37G-1
37G-2
Close Circuit Fail 1
Close Circuit Fail 2
Close Circuit Fail 3
Close Circuit Fail 4
Close Circuit Fail 5
Close Circuit Fail 6
Close Circuit Fail 7
Close Circuit Fail 8
Close Circuit Fail 9
Close Circuit Fail 10
CB1 Trip Time Alarm
CB2 Trip Time Alarm
Close CB1
CB1 Fail To Close
CB1 DBI
Open CB1
CB1 Fail To Open
Close CB2
CB2 Fail To Close
CB2 DBI
Open CB2
CB2 Fail To Open
E/F Out
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
©2010 Siemens Protection Devices Limited
Default Class
Default Variation
Default Event Variation
Chapter 4 Page 36 of 43
7SR242 Duobias Data Communications
Binary Output Status Points and Control Relay Output Blocks
The following table lists both the Binary Output Status Points (Object 10) and the Control Relay Output Blocks
(Object 12).
While Binary Output Status Points are included here for completeness, they are not often polled by DNP 3.0
Masters. It is recommended that Binary Output Status points represent the most recent DNP “commanded” value
for the corresponding Control Relay Output Block (CROB) point. Because many, if not most, Control Relay
Output Block points are controlled through pulse mechanisms, the value of the output status may in fact be
meaningless. Binary Output Status points are not recommended to be included in class 0 polls.
As an alternative, it is recommended that “actual” status values of Control Relay Output Block points be looped
around and mapped as Binary Inputs. (The “actual” status value, as opposed to the “commanded” status value, is
the value of the actuated control. For example, a DNP control command may be blocked through hardware or
software mechanisms; in this case, the actual status value would indicate the control failed because of the
blocking. Looping Control Relay Output Block actual status values as Binary Inputs has several advantages:
x
it allows actual statuses to be included in class 0 polls,
x
it allows change event reporting of the actual statuses, which is a more efficient and time-accurate
method of communicating control values,
x
and it allows reporting of time-based information associated with controls, including any delays before
controls are actuated, and any durations if the controls are pulsed.
The default select/control buffer size is large enough to hold 10 of the largest select requests possible.
Binary Output Status Points
Object Number: 10
Default Variation reported when variation 0 requested: 2 (Binary Output Status)
Control Relay Output Blocks
Object Number: 12
Default
Default
Default
Supported
Default
Point
Name/
Class
Variation
Event
CROB
CROB
Index
Description
Variation
Fields
Fields
1
Binary Output 1
1
2
2
Pulse On
Pulse On
Latch On
2
Binary Output 2
1
2
2
Pulse On
Pulse On
Latch On
3
Binary Output 3
1
2
2
Pulse On
Pulse On
Latch On
4
Binary Output 4
1
2
2
Pulse On
Pulse On
Latch On
5
Binary Output 5
1
2
2
Pulse On
Pulse On
Latch On
6
Binary Output 6
1
2
2
Pulse On
Pulse On
Latch On
7
Binary Output 7
1
2
2
Pulse On
Pulse On
Latch On
8
Binary Output 8
1
2
2
Pulse On
Pulse On
Latch On
9
Binary Output 9
1
2
2
Pulse On
Pulse On
Latch On
10
Binary Output 10
1
2
2
Pulse On
Pulse On
Latch On
11
Binary Output 11
1
2
2
Pulse On
Pulse On
Latch On
12
Binary Output 12
1
2
2
Pulse On
Pulse On
Latch On
13
Binary Output 13
1
2
2
Pulse On
Pulse On
Latch On
14
Binary Output 14
1
2
2
Pulse On
Pulse On
Latch On
33
LED reset
1
2
2
34
Settings Group 1
1
2
2
35
Settings Group 2
1
2
2
©2010 Siemens Protection Devices Limited
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Latch On
Chapter 4 Page 37 of 43
7SR242 Duobias Data Communications
Binary Output Status Points
Object Number: 10
Default Variation reported when variation 0 requested: 2 (Binary Output Status)
Control Relay Output Blocks
Object Number: 12
Default
Default
Default
Point
Name/
Class
Variation
Event
Index
Description
Variation
36
Settings Group 3
1
2
2
37
Settings Group 4
1
2
2
38
Settings Group 5
1
2
2
39
Settings Group 6
1
2
2
40
Settings Group 7
1
2
2
41
Settings Group 8
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
1
2
2
42
CB 1
43
CB 2
44
45
46
47
48
49
50
51
52
53
54
55
56
Demand metering reset, write
only location.
Reset CB1 Total Trip Count,
write only location.
Reset CB1 Delta Trip Count,
write only location.
Reset CB1 Lockout Trip Count,
write only location.
Reset I^2t CB1 Wear
Reset I^2t CB2 Wear
Reset CB2 Total Trip Count,
write only location.
Reset CB2 Delta Trip Count,
write only location.
Reset CB2 Lockout Trip Count,
write only location.
Remote mode
Service mode
Local mode
Local & Remote
©2010 Siemens Protection Devices Limited
Supported
CROB
Fields
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Pulse Off
Latch On
Latch Off
Pulse On
Pulse Off
Latch On
Latch Off
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Pulse On
Latch On
Default
CROB
Fields
Latch On
Latch On
Latch On
Latch On
Latch On
Latch On
Pulse On
Pulse Off
Pulse On
Pulse Off
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Pulse On
Chapter 4 Page 38 of 43
7SR242 Duobias Data Communications
Analog Inputs
The following table lists Analog Inputs (Object 30). It is important to note that 16-bit and 32-bit variations of
Analog Inputs, Analog Output Control Blocks, and Analog Output Statuses are transmitted through DNP as
signed numbers.
The “Default Deadband,” and the “Default Change Event Assigned Class” columns are used to represent the
absolute amount by which the point must change before an analog change event will be generated, and once
generated in which class poll (1, 2, 3, or none) will the change event be reported.
The default analog input event buffer size is set 30.
Analog Inputs
Static (Steady-State) Object Number: 30
Change Event Object Number: 32
Static Variation reported when variation 0 requested: 3 (32-Bit Analog Input w/o Flag), 4 (16-Bit Analog
Input w/o Flag)
Change Event Variation reported when variation 0 requested: 1 (32-Bit Analog Change Event w/o Time)
Default
Default
Default
Point
Default
Default
Event
Name/Description
Multiplier
Deadband
Index
Class
Variation
Variation
0
Frequency (Hz)
3
2
4
100
1
1
V Primary (kV)
3
2
4
0.001
1000
2
Voltage Secondary
3
2
4
100
1
3
Voltage Nominal
3
2
4
100
1
4
Operate Ia
3
2
4
100
1
5
Operate Ib
3
2
4
100
1
6
Operate Ic
3
2
4
100
1
7
Restrain Ia
3
2
4
100
1
8
Restrain Ib
3
2
4
100
1
9
Restrain Ic
3
2
4
100
1
nd
10
W1 2 Harmonic Ia
3
2
4
100
1
nd
11
W1 2 Harmonic Ib
3
2
4
100
1
nd
12
W1 2 Harmonic Ic
3
2
4
100
1
13
W2 2nd Harmonic Ia
3
2
4
100
1
14
W2 2nd Harmonic Ib
3
2
4
100
1
nd
15
W2 2 Harmonic Ic
3
2
4
100
1
16
Primary Ig-1
3
2
4
100
1
17
Secondary Ig-1
3
2
4
100
1
18
Nominal Ig-1
3
2
4
100
1
19
Primary Ig-2
3
2
4
100
1
20
Secondary Ig-2
3
2
4
100
1
21
Nominal Ig-2
3
2
4
100
1
22
V/f V
3
2
4
100
1
23
V/f
3
2
4
100
1
24
V/f 24IT
3
2
4
100
1
25
Thermal Status Ph A
3
2
4
100
1
26
Thermal Status Ph B
3
2
4
100
1
27
Thermal Status Ph C
3
2
4
100
1
28
W1 Primary Ia
3
2
4
0.001
1000
29
W1 Primary Ib
3
2
4
0.001
1000
30
W1 Primary Ic
3
2
4
0.001
1000
31
W1 Secondary Ia
3
2
4
100
1
32
W1 Secondary Ib
3
2
4
100
1
33
W1 Secondary Ic
3
2
4
100
1
34
W1 Nominal Ia
3
2
4
100
1
35
W1 Nominal Ib
3
2
4
100
1
36
W1 Nominal Ic
3
2
4
100
1
37
W1 Line Ia
3
2
4
100
1
38
W1 Line Ib
3
2
4
100
1
©2010 Siemens Protection Devices Limited
Chapter 4 Page 39 of 43
7SR242 Duobias Data Communications
Analog Inputs
Static (Steady-State) Object Number: 30
Change Event Object Number: 32
Static Variation reported when variation 0 requested: 3 (32-Bit Analog Input w/o Flag), 4 (16-Bit Analog
Input w/o Flag)
Change Event Variation reported when variation 0 requested: 1 (32-Bit Analog Change Event w/o Time)
Default
Point
Default
Default
Default
Default
Event
Name/Description
Index
Class
Variation
Multiplier
Deadband
Variation
39
W1 Line Ic
3
2
4
100
1
40
W1 Relay Ia
3
2
4
100
1
41
W1 Relay Ib
3
2
4
100
1
42
W1 Relay Ic
3
2
4
100
1
43
W2 Primary Ia
3
2
4
0.001
1000
44
W2 Primary Ib
3
2
4
0.001
1000
45
W2 Primary Ic
3
2
4
0.001
1000
46
W2 Secondary Ia
3
2
4
100
1
47
W2 Secondary Ib
3
2
4
100
1
48
W2 Secondary Ic
3
2
4
100
1
49
W2 Nominal Ia
3
2
4
100
1
50
W2 Nominal Ib
3
2
4
100
1
51
W2 Nominal Ic
3
2
4
100
1
52
W2 Line Ia
3
2
4
100
1
53
W2 Line Ib
3
2
4
100
1
54
W2 Line Ic
3
2
4
100
1
55
W2 Relay Ia
3
2
4
100
1
56
W2 Relay Ib
3
2
4
100
1
57
W2 Relay Ic
3
2
4
100
1
73
74
75
76
77
78
79
80
81
Fault Records
Event Records
Waveform Records
W1 I Phase A Max
W1 I Phase B Max
W1 I Phase C Max
W2 I Phase A Max
W2 I Phase B Max
W2 I Phase C Max
Data
Type
Static
Variant
Description
DT1
3
Data is sent as a 32 bit integer in fixed point to 3 decimal places format. E.g. a
value of 1023 = 1.023
DT2
4
Data is sent as a 16 bit integer.
©2010 Siemens Protection Devices Limited
3
3
3
3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
4
4
4
4
4
4
4
4
4
1
1
1
100
100
100
100
100
100
1
1
1
1
1
1
1
1
1
Chapter 4 Page 40 of 43
7SR242 Duobias Data Communications
Section 6: Modems
The communications interface has been designed to allow data transfer via modems. However, IEC 60870-5-103
defines the data transfer protocol as an 11 bit format of 1 start, 1 stop, 8 data and even parity, which is a mode
most commercial modems do not support. High performance modems will support this mode, but are expensive.
For this reason, a parity setting is provided to allow use of easily available and relatively inexpensive commercial
modems. This will result in a small reduction in data security and the system will not be compatible with true IEC
60870-5-103 control systems.
6.1.1
Connecting a Modem to the Relay(s)
RS232C defines devices as being either Data Terminal Equipment (DTE) e.g. computers, or data
Communications Equipment (DCE), e.g. modems, where one is designed to be connected to the other. In this
case, two DCE devices (the modem and the fibre-optic converter) are being connected together, so a null terminal
connector is required which switches various control lines. The fibre-optic converter is then connected to the relay
Network Tx to Relay Rx and Network Rx to Relay Tx.
6.1.2
Setting the Remote Modem
The exact settings of the modem are dependent on the type of modem. Although most modems support the basic
Hayes ‘AT’ command format, different manufacturers use different commands for the same functions. In addition,
some modems use DIP switches to set parameters, others are entirely software configured.
Before applying settings, the modem’s factory default settings should be applied, to ensure it is in a known state.
Several factors must be considered to allow remote dialling to the relays. The first is that the modem at the
remote end must be configured as auto answer. This will allow it to initiate communications with the relays. Next,
the user should set the data configuration at the local port, i.e. baud rate and parity, so that communication will be
at the same rate and format as that set on the relay and the error correction is disabled.
Auto-answer usually requires two parameters to be set. The auto-answer setting should be switched on and the
number of rings after which it will answer. The Data Terminal Ready (DTR) settings should be forced on. This tells
the modem that the device connected to it is ready to receive data.
The parameters of the modem’s RS232C port are set to match those set on the relay, set baud rate and parity to
be the same as the settings on the relay and number of data bits to be 8 and stop bits 1. Note, although the
device may be able to communicate with the modem at say 19200 bps, the modem may only be able to transmit
over the telephone lines at 14400 bps. Therefore, a baud rate setting on which the modem can transmit should be
chosen. In this example, a baud rate of 9600 should be chosen.
As the modems are required to be transparent, simply passing on the data sent from the controller to the device
and vice versa, error correction and buffering is turned off.
If possible, Data Carrier Detect (DCD) should be forced on, as this control line will be used by the Fibre-optic
converter.
Finally, these settings should be stored in the modem’s memory for power on defaults.
©2010 Siemens Protection Devices Limited
Chapter 4 Page 41 of 43
7SR242 Duobias Data Communications
6.1.3
Connecting to the Remote Modem
Once the remote modem has been configured correctly, it should be possible to dial up the modem and make
connection to the relay. As the settings on the remote modem are fixed the local modem should negotiate with it
on connection, choosing suitable matching settings. If it cannot do this, the local modem should be set with
settings equivalent to those of the remote modem as described above.
Figure 6-1
Communication to Device using Sigma 4 and Modem
©2010 Siemens Protection Devices Limited
Chapter 4 Page 42 of 43
7SR242 Duobias Data Communications
Section 7: Glossary
Baud Rate
Data transmission speed.
Bit
The smallest measure of computer data.
Bits Per Second (bps)
Measurement of data transmission speed.
Data Bits
A number of bits containing the data. Sent after the start bit.
Data Echo
When connecting relays in an optical ring architecture, the data must be passed from one relay to the next,
therefore when connecting in this method all relays must have the Data Echo ON.
Half-Duplex Asynchronous Communications
Communications in two directions, but only one at a time.
Hayes ‘AT’
Modem command set developed by Hayes Microcomputer products, Inc.
Line Idle
Determines when the device is not communicating if the idle state transmits light.
Modem
MOdulator / DEModulator device for connecting computer equipment to a telephone line.
Parity
Method of error checking by counting the value of the bits in a sequence, and adding a parity bit to make the
outcome, for example, even.
Parity Bit
Bit used for implementing parity checking. Sent after the data bits.
RS232C
Serial Communications Standard. Electronic Industries Association Recommended Standard Number 232,
Revision C.
RS485
Serial Communications Standard. Electronic Industries Association Recommended Standard Number 485.
Start Bit
Bit (logical 0) sent to signify the start of a byte during data transmission.
Stop Bit
Bit (logical 1) sent to signify the end
USB
Universal Serial Bus standard for the transfer of data.
©2010 Siemens Protection Devices Limited
Chapter 4 Page 43 of 43
7SR242 Duobias Installation Guide
7SR242 Duobias
Multi-Function 2-Winding Transformer Protection Relay
Document Release History
This document is issue 2010/02. The list of revisions up to and including this issue is:
2010/02
Document reformat due to rebrand
2010/02
Third issue. Software revision 2662H80001 R4c-3
2008/07
Second issue. Software revision 2662H80001R3d-2c.
2008/05
First issue
Software Revision History
2010/02
2662H80001 R4c-3
Revisions to: VT ratio settings, 87BD 1st bias slope limit setting
increments, CB fail function, LED CONFIG menu, DATA
STORAGE menu.
Added: Open circuit detection (46BC), CONTROL MODE
menu, Close circuit supervision (74CCS), Measured earth fault
undercurrent (37G), Pulsed output contacts.
2008/07
2662H80001R3d-2c.
Demand metering. Optional DNP3.0 data comms.
2008/05
2662H80001R3-2b
First Release
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Installation Guide
Contents
Document Release History....................................................................................................................1
Software Revision History.....................................................................................................................1
Contents ..................................................................................................................................................2
List of Figures.........................................................................................................................................3
Section 1: Installation ............................................................................................................................4
1.1 Unpacking, Storage and Handling ............................................................................................4
1.2 Recommended Mounting Position ............................................................................................4
1.3 Wiring ........................................................................................................................................4
1.4 Earthing.....................................................................................................................................4
1.5 Ancillary Equipment ..................................................................................................................4
Section 2: Equipment Operating Conditions.......................................................................................5
2.1 Current Transformer Circuits ....................................................................................................5
2.2 External Resistors.....................................................................................................................5
2.3 Fibre Optic Communication ......................................................................................................5
2.4 Front Cover ...............................................................................................................................5
Section 3: Dimensions and Panel Fixings ...........................................................................................6
3.1 Relay Dimensions and Weight..................................................................................................6
3.2 Fixings.......................................................................................................................................7
3.2.1 Crimps ..........................................................................................................................7
3.2.2 Panel Fixings................................................................................................................7
Section 4: Rear Terminal Drawings ......................................................................................................8
4.1 E8 CASE ...................................................................................................................................8
4.2 E10 CASE .................................................................................................................................9
Section 5: Connection/Wiring/Diagrams............................................................................................10
5.1 Wiring Diagram: 7SR242 Relay ..............................................................................................10
Section 6: Data Comms Connections ................................................................................................11
6.1 RS485 Connection..................................................................................................................11
6.2 IRIG-B Connections ................................................................................................................11
6.3 Fibre Optic Connections .........................................................................................................12
Section 7: Connection Diagrams ........................................................................................................13
7.1 Typical Connection: 7SR242 ..................................................................................................13
©2010 Siemens Protection Devices Limited
Chapter 5 Page 2 of 13
7SR242 Duobias Installation Guide
List of Figures
Figure 5.1-1 7SR242 Wiring Diagram ....................................................................................................10
Figure 6.1-1 RS485 Data Comms Connections.....................................................................................11
Figure 6.3-1 Data Comms to Multiple Devices Using Sigma 1 and F.O. Star Network .........................12
Figure 6.3-2 Data Comms to Multiple Devices Using Sigma 3 and F.O. Ring Network ........................12
Figure 7.1-1 7SR24 Typical Connections ..............................................................................................13
©2010 Siemens Protection Devices Limited
Chapter 5 Page 3 of 13
7SR242 Duobias Installation Guide
Section 1: Installation
1.1 Unpacking, Storage and Handling
On receipt remove the relay from the container in which it was received and inspect it for obvious damage. It is
recommended that the relay not be removed from its case.
If damage has been sustained a claim should be immediately be made against the carrier, also inform Siemens
Protection Devices Limited and to the nearest Siemens agent.
When not required for immediate use the relay should be returned to its original carton and stored in a clean, dry
place.
The relay contains static sensitive devices, which are susceptible to damage due to static discharge. The relay’s
electronic circuits are protected from damage by static discharge when the relay is housed in its case.
There can be no requirement to disassemble any relay, since there are no user serviceable parts in the relay. If
any modules have been tampered with the guarantee will be invalidated. Siemens Protection Devices Limited
reserves the right to charge for any subsequent repairs.
1.2 Recommended Mounting Position
The relay uses a liquid crystal display (LCD) which is used in the programming and for operation. The LCD has a
vertical viewing angle of ± 30˚ and is back–lit. However, the best viewing position is at eye level, and this is
particularly important given its control features.
The relay should be mounted on the circuit breaker (or protection panel) to allow the operator the best access to
the relay functions
1.3 Wiring
The product should be wired according to the scheme requirements, with reference to the appropriate wiring
diagram. Refer to the appropriate Diagrams and Parameters document for a cross reference of wiring diagrams
and models.
1.4 Earthing
Terminal 28 of the PSU (Power Supply Unit) should be solidly earthed by a direct connection to the panel earth.
The relay case earth stud connection should be connected to terminal 28 of the PSU.
It is normal practice to additionally 'daisy chain' together the case (safety) earths of all the relays installed in a
panel to prevent earth current loops posing a risk to personnel.
1.5 Ancillary Equipment
The relay can be interrogated locally or remotely. For local interrogation a portable PC with suitable version of
MS Windows (2000 SP4 or XP SP2)and Reydisp Evolution™ s/w (Latest Version available 32 bit) using USB port
situated on front of the relay.
©2010 Siemens Protection Devices Limited
Chapter 5 Page 4 of 13
7SR242 Duobias Installation Guide
Section 2: Equipment Operating Conditions
2.1 Current Transformer Circuits
The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can
result in injury to personnel and/or damage to equipment.
!
2.2 External Resistors
Where external resistors are fitted to relays there may be a risk of electric shock or burns if touched.
!
2.3 Fibre Optic Communication
Where fibre optic communication devices are fitted, these should not be viewed directly. Optical power
meters should be used to determine the operation or signal level of the device.
!
2.4 Front Cover
The front cover provides additional securing of the relay element within the case. The relay cover should
be in place during normal operating conditions.
!
©2010 Siemens Protection Devices Limited
Chapter 5 Page 5 of 13
7SR242 Duobias Installation Guide
Section 3: Dimensions and Panel Fixings
3.1 Relay Dimensions and Weight
Relays are supplied in size E8 and E10 cases.
The drawing below provide panel cut-out and mounting details.
Overall Dimensions and panel Drilling for Size E8 Epsilon case (Typically 5.3 Kg)
Overall Dimensions and Panel Drilling for Size E10 Epsilon Case
©2010 Siemens Protection Devices Limited
Chapter 5 Page 6 of 13
7SR242 Duobias Installation Guide
3.2
Fixings
3.2.1 Crimps
Ring tongued crimps with 90˚ bend are recommended.
3.2.2 Panel Fixings
Typical mounting screw kit per Relay)
Consists of 4 off M4x10mm Screws
4 off M4 Nuts
4 off M4 Lock Washer
Typical rear terminal block fixing kit (1kit per terminal block fitted to relay) Consists of:
28 x M4, 8mm Screws
28 x M4 Lock Washer
©2010 Siemens Protection Devices Limited
Chapter 5 Page 7 of 13
7SR242 Duobias Installation Guide
Section 4: Rear Terminal Drawings
4.1
E8 CASE
%
$
#
E8 STANDARD COMMS:- USB FRONT PORT,RS485 (SEE NOTE 2)
%
$
#
E8 STANDARD COMMS + ADDITIONAL PORTS i.e.:- USB FRONT PORT,
RS485 (SEE NOTE 2) IRIG B, 2 X F.O. (S.T. CONNECTORS)
Notes
1) RECOMMENDED TERMINATIONS ARE PRE-INSULATED & MUST BE CRIMPED USING APPROVED
TOOLING.
2) RS485 (BLOCK”B”TERMS 14, 16, 18, 20) CONNECTION TO THIS COMMUNICATION FACILITY IS BY
SCREENED, TWISTED PAIR CABLE. ON SITE WHEN WIRING OTHER FACILITIES ENSURE THAT THESE
TERMINALS ARE NOT OBSCURED BY OTHER WIRING RUNS. CABLE SHOULD BE RS485 COMPLIANT.
©2010 Siemens Protection Devices Limited
Chapter 5 Page 8 of 13
7SR242 Duobias Installation Guide
4.2
E10 CASE
&
%
$
#
&
%
$
#
Notes
1) RECOMMENDED TERMINATIONS ARE PRE-INSULATED & MUST BE CRIMPED USING APPROVED
TOOLING.
2) RS485 (BLOCK”B”TERMS 14, 16, 18, 20) CONNECTION TO THIS COMMUNICATION FACILITY IS BY
SCREENED, TWISTED PAIR CABLE. ON SITE WHEN WIRING OTHER FACILITIES ENSURE THAT THESE
TERMINALS ARE NOT OBSCURED BY OTHER WIRING RUNS. CABLE SHOULD BE RS485 COMPLIANT.
©2010 Siemens Protection Devices Limited
Chapter 5 Page 9 of 13
7SR242 Duobias Installation Guide
Section 5: Connection/Wiring/Diagrams
5.1
Wiring Diagram: 7SR242 Relay
Figure 5.1-1 7SR242 Wiring Diagram
©2010 Siemens Protection Devices Limited
Chapter 5 Page 10 of 13
7SR242 Duobias Installation Guide
Section 6: Data Comms Connections
6.1
RS485 Connection
The RS485 communication port terminals are located on the rear of the relay and can be connected using a
suitable RS485 120 screened twisted pair cable.
The RS485 electrical connection can be used in a single or multi-drop configuration. The RS485 master must
support and use the Auto Device Enable (ADE) feature.
The last device in the connection must be terminated correctly in accordance with the master driving the
connection. A terminating resistor is fitted in each relay, when required this is connected in circuit using an
external wire loop between terminals 18 and 20 of the power supply module.
Up to 64 relays can be connected to the RS485 bus.
18
20
Term.
14
+ve
16
20
-ve
18
Term.
GND
16
-ve
20
14
18
Term.
+ve
16
-ve
GND
14
+ve
GND
Each relay has an internal terminating resistor – this can be connected in circuit where necessary.
Figure 6.1-1 RS485 Data Comms Connections
6.2
IRIG-B Connections
A BNC plug is provided to connect a co-axial cable carrying IRIG-B time synchronisation signals. Ensure that the
stub length is minimised by connecting the tee-connector directly to the rear of the relay. A suitable co-axial cable
would be type RG 58 50ohms.
©2010 Siemens Protection Devices Limited
Chapter 5 Page 11 of 13
7SR242 Duobias Installation Guide
6.3
Fibre Optic Connections
Where fitted rear Data Comms ports 3 and 4 comprise Fibre–Optic ST™ (BFOC/2.5) bayonet connectors-4 per
product. 62.5 / 125m glass fibre is recommended for all lead lengths.
When installing fibre, ensure that the fibres’ bend radii comply with the recommended minimum for the fibre usedtypically 50mm is acceptable.
The fibre optic data comms link will be interrupted if the relay element is withdrawn from the case.
Figure 6.3-1 Data Comms to Multiple Devices Using Sigma 1 and F.O. Star Network
Figure 6.3-2 Data Comms to Multiple Devices Using Sigma 3 and F.O. Ring Network
©2010 Siemens Protection Devices Limited
Chapter 5 Page 12 of 13
7SR242 Duobias Installation Guide
Section 7: Connection Diagrams
7.1
Typical Connection: 7SR242
Figure 7.1-1 7SR24 Typical Connections
©2010 Siemens Protection Devices Limited
Chapter 5 Page 13 of 13
7SR242 Duobias Commissioning & Maintenance Guide
7SR242 Duobias
Multi-Function 2-Winding Transformer Protection Relay
Document Release History
This document is issue 2010/02. The list of revisions up to and including this issue is:
2010/02
Document reformat due to rebrand
2010/02
Third issue. Software revision 2662H80001 R4c-3
2008/07
Second issue. Software revision 2662H80001R3d-2c.
2008/05
First issue
Software Revision History
2010/02
2662H80001 R4c-3
st
Revisions to: VT ratio settings, 87BD 1 bias slope limit setting
increments, CB fail function, LED CONFIG menu, DATA STORAGE
menu.
Added: Open circuit detection (46BC), CONTROL MODE menu,
Close circuit supervision (74CCS), Measured earth fault undercurrent
(37G), Pulsed output contacts.
2008/07
2662H80001R3d-2c.
Demand metering. Optional DNP3.0 data comms.
2008/05
2662H80001R3-2b
First Release
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Commissioning & Maintenance Guide
Contents
Document Release History....................................................................................................................1
Software Revision History.....................................................................................................................1
Contents ..................................................................................................................................................2
Section 1: Common Functions .............................................................................................................5
1.1 Overview ...................................................................................................................................5
1.2 Before Testing...........................................................................................................................5
1.2.1 Safety ...........................................................................................................................5
1.2.2 Sequence of Tests .......................................................................................................5
1.2.3 Test Equipment ............................................................................................................6
1.2.4 Precautions ..................................................................................................................6
1.2.5 Applying Settings .........................................................................................................7
1.3 Tests .........................................................................................................................................8
1.3.1 Inspection .....................................................................................................................8
1.3.2 Secondary Injection Tests............................................................................................8
1.3.3 Primary Injection Tests.................................................................................................8
1.3.4 Putting into Service ......................................................................................................8
1.4 AC Energising Quantities..........................................................................................................9
1.5 Binary Inputs ...........................................................................................................................10
1.6 Binary Outputs ........................................................................................................................11
1.7 Relay Case Shorting Contacts................................................................................................11
Section 2: Protection Functions .........................................................................................................12
2.1 Biased Differential (87BD, 87HS) ...........................................................................................14
2.1.1 Secondary Injection Testing.......................................................................................14
2.1.2 Primary Injection Testing............................................................................................17
2.1.3 Phase Overcurrent (50, 51)........................................................................................18
2.1.4 Definite Time Overcurrent (50) ...............................................................................19
2.1.5 Inverse Time Overcurrent (51) .................................................................................19
2.2 Derived Earth fault (50N,51N).................................................................................................21
2.2.1 Definite Time Overcurrent (50N).............................................................................22
2.2.2 Inverse Time Overcurrent (51N) ..............................................................................22
2.2.3 ANSI Reset.................................................................................................................23
2.3 Measured Earth fault (50G, 51G)............................................................................................24
2.3.1 Definite Time Overcurrent (50G).............................................................................25
2.3.2 Inverse Time Overcurrent (51G) ..............................................................................25
2.3.3 ANSI Reset.................................................................................................................26
2.4 Restricted Earth fault (64H) ..................................................................................................27
2.5 Open Circuit (46BC)..............................................................................................................29
2.6 Negative Phase Sequence Overcurrent (46NPS) ..................................................................31
2.6.1 Definite Time NPS Overcurrent (46DT) ..................................................................32
2.6.2 Inverse Time NPS Overcurrent (46IT) .....................................................................32
2.7 Undercurrent (37, 37G).........................................................................................................34
2.7.1 37-n Elements ............................................................................................................34
2.7.2 37G-n Elements .........................................................................................................35
2.8 Thermal Overload (49)............................................................................................................36
2.9 Under/Over Voltage (27/59)...................................................................................................38
2.9.2 Undervoltage Guard (27/59UVG) ..............................................................................40
2.10 Neutral Over Voltage (59N) ..................................................................................................41
2.10.1 Definite Time (59NDT) ...............................................................................................42
2.10.2 Inverse Time (59NIT) .................................................................................................42
©2010 Siemens Protection Devices Limited
Chapter 6 Page 2 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.11 Under/Over Frequency (81) ....................................................................................................43
2.12 Overfluxing (24) ......................................................................................................................45
2.12.1 definite time (24DT)....................................................................................................45
2.12.2 inverse time (24IT) .....................................................................................................46
Section 3: Supervision Functions ......................................................................................................47
3.1 CB Fail (50BF) ........................................................................................................................47
3.2 Trip/Close Circuit Supervision (74TCS, 74CCS) ..................................................................49
3.3 Magnetising Inrush Detector (81HBL2) ................................................................................50
3.4 Overfluxing Detector (81HBL5).............................................................................................52
Section 4: Control & Logic Functions ................................................................................................53
4.1 Quick Logic .............................................................................................................................53
Section 5: Testing and Maintenance ..................................................................................................54
5.1 Periodic Tests .........................................................................................................................54
5.2 Maintenance............................................................................................................................54
5.3 Troubleshooting ......................................................................................................................54
5.4 Defect Report ..........................................................................................................................56
©2010 Siemens Protection Devices Limited
Chapter 6 Page 3 of 56
7SR242 Duobias Commissioning & Maintenance Guide
List of Figures
Figure 2-1 Biased Differential..............................................................................................................14
Figure 2-2 Secondary Injection using a Variac ...................................................................................15
Figure 2-3 Phase Overcurrent.............................................................................................................18
Figure 2-4 Measured Earth Fault ..........................................................................................................21
Figure 2-5 Measured Earth Fault ..........................................................................................................24
Figure 2-6 Restricted Earth Fault ..........................................................................................................27
Figure 2-7 Open Circuit ..........................................................................................................................29
Figure 2-8 Negative Phase Sequence Overcurrent ...............................................................................31
Figure 2-9 Undercurrent .........................................................................................................................34
Figure 2-10 Thermal Overload ...............................................................................................................36
Figure 2-11 Phase Under/Over Voltage.................................................................................................38
Figure 2-12 Neutral Overvoltage ............................................................................................................41
Figure 2-13 Under/Over Frequency .......................................................................................................43
Figure 2-14 Under/Over Frequency .......................................................................................................45
Figure 3-1 CB Fail ..................................................................................................................................47
Figure 3-2 Trip Circuit Supervision.........................................................................................................49
Figure 3-3 Magnetising Inrush Detector.................................................................................................50
Figure 3-4 Magnetising Inrush Detector.................................................................................................52
©2010 Siemens Protection Devices Limited
Chapter 6 Page 4 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Section 1: Common Functions
1.1
Overview
Commissioning tests are carried out to prove:
a)
Equipment has not been damaged in transit.
b)
Equipment has been correctly connected and installed.
c)
Prove characteristics of the protection and settings which are based on calculations.
d)
Confirm that settings have been correctly applied.
e)
To obtain a set of test results for future reference.
1.2
Before Testing
1.2.1
Safety
The commissioning and maintenance of this equipment should only be carried out by skilled personnel trained in
protective relay maintenance and capable of observing all the safety precautions and regulations appropriate to
this type of equipment and also the associated primary plant.
Ensure that all test equipment and leads have been correctly maintained and are in good condition. It is
recommended that all power supplies to test equipment be connected via a Residual Current Device (RCD),
which should be located as close to the supply source as possible.
The choice of test instrument and test leads must be appropriate to the application. Fused instrument leads
should be used when measurements of power sources are involved, since the selection of an inappropriate range
on a multi-range instrument could lead to a dangerous flashover. Fused test leads should not be used where the
measurement of a current transformer (C.T.) secondary current is involved, the failure or blowing of an instrument
fuse or the operation of an instrument cut-out could cause the secondary winding of the C.T. to become an open
circuit.
Open circuit secondary windings on energised current transformers are a hazard that can produce high voltages
dangerous to personnel and damaging to equipment, test procedures must be devised so as to eliminate this risk.
1.2.2
Sequence of Tests
If other equipment is to be tested at the same time, then such testing must be co-ordinated to avoid danger to
personnel and/or equipment.
When all cabling and wiring is completed, a comprehensive check of all terminations for tightness and compliance
with the approved diagrams must be carried out. This can then be followed by the insulation resistance tests
which, if satisfactory allows the wiring to be energised by either the appropriate station supply or test supply.
When primary injection tests are completed satisfactorily, all remaining systems can be functionally tested before
the primary circuit is energised. Some circuits may require further tests before being put on load.
Protection relay testing will require access to the protection system wiring diagrams, relay configuration
information and protection settings. The following sequence of tests is loosely based on the arrangement of the
relay menu structure. A test log based on the actual tests completed should be recorded for each relay tested. A
typical example of this Site Test Sheet is included.
The ‘Description of Operation’ section of this manual provides detailed information regarding the operation of
each function of the relay.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 5 of 56
7SR242 Duobias Commissioning & Maintenance Guide
1.2.3
Test Equipment
Required test equipment is:
Secondary injection equipment with integral time interval meter
Primary injection equipment
A d.c. supply with nominal voltage within the working range of the relay's d.c. auxiliary supply rating
A d.c. supply with nominal voltage within the working range of the relay’s d.c. binary input rating
Other equipment as appropriate to the protection being commissioned – this will be specified in the product
specific documentation.
The secondary injection equipment should be appropriate to the protection functions to be tested. Additional
equipment for general tests and for testing the communications channel is:
x
Portable PC with appropriate interface equipment.
Printer to operate from the above PC (Optional).
Use of PC to facilitate testing
The functions of ReyDisp Evolution (see Section 2: Settings and Instruments) can be used during the
commissioning tests to assist with test procedures or to provide documentation recording the test and test
parameters. One method is to clear both the waveform and event records before each test is started, then, after
the test upload from the relay the settings, events and waveform files generated as a result of application of the
test. These can then be saved off to retain a comprehensive record of that test.
Relay settings files can be prepared on the PC (offline) or on the relay before testing commences. These settings
should be saved for reference and compared with the settings at the end of testing to check that errors have not
been introduced during testing and that any temporary changes to settings to suit the test process are returned to
the required service state.
A copy of the Relay Settings as a Rich Text Format (.rtf) file suitable for printing or for record purposes can be
produced from ReyDisp as follows. From the File menu select Save As, change the file type to Export
Default/Actual Setting (.RTF) and input a suitable filename.
When testing is completed the event and waveform records should be cleared and the settings file checked to
ensure that the required in-service settings are being applied.
1.2.4
Precautions
Before electrical testing commences the equipment should be isolated from the current and voltage transformers.
The current transformers should be short-circuited in line with the local site procedure. The tripping and alarm
circuits should also be isolated where practical. The provision and use of secondary injection test sockets on the
panel simplifies the isolation and test procedure.
Ensure that the correct auxiliary supply voltage and polarity is applied. See the relevant scheme diagrams for the
relay connections.
Check that the nominal secondary current rating of the current and voltage transformers has been correctly set in
the System Config menu of the relay.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 6 of 56
7SR242 Duobias Commissioning & Maintenance Guide
1.2.5
Applying Settings
The relay settings for the particular application should be applied before any secondary testing occurs. If they are
not available then the relay has default settings that can be used for pre-commissioning tests. See the Relay
Settings section of this manual for the default settings.
Note that the tripping and alarm contacts for any function must be programmed correctly before any scheme tests
are carried out.
The relay features multiple settings groups, only one of which is active at a time. In applications where more than
one settings group is to be used it may be necessary to test the relay in more than one configuration.
Note. One group may be used as a ‘Test’ group to hold test-only settings that can be used for regular
maintenance testing, eliminating the need for the Test Engineer to interfere with the actual in-service settings in
the normally active group. This Test group may also be used for functional testing where it is necessary to disable
or change settings to facilitate testing.
When using settings groups it is important to remember that the relay need not necessarily be operating
according to the settings that are currently being displayed. There is an ‘active settings group’ on which the relay
operates and an ‘edit/view settings group’ which is visible on the display and which can be altered. This allows the
settings in one group to be altered from the relay fascia while the protection continues to operate on a different
unaffected group. The ‘Active Settings Group’ and the ‘Edit Settings Group’ are selected in the ‘System
Configuration Menu’.
The currently Active Group and the group currently Viewed are shown at the top of the display in the Settings
display screen. If the View Group is not shown at the top of the display, this indicates that the setting is common
to all groups. CT/VT ratio, I/O mapping and other settings which are directly related to hardware are common to
all groups.
If the relay is allowed to trip during testing then the instruments display will be interrupted and replaced by the
‘Trip Alert’ screen which displays fault data information. If this normal operation interferes with testing then this
function can be temporarily disabled for the duration of testing by use of the Trip Alert Enabled/Disabled setting in
the System Config Menu.
After applying a settings change to the relay, which may involve a change to the indication and output contacts,
the TEST/RESET key should be pressed to ensure any existing indication and output is correctly cleared.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 7 of 56
7SR242 Duobias Commissioning & Maintenance Guide
1.3
Tests
1.3.1
Inspection
Ensure that all connections are tight and correct to the relay wiring diagram and the scheme diagram. Record any
deviations. Check that the relay is correctly programmed and that it is fully inserted into the case. Refer to
‘Section 2: Settings and Instruments’ for information on programming the relay.
1.3.2
Secondary Injection Tests
Select the required relay configuration and settings for the application.
Isolate the auxiliary D.C. supplies for alarm and tripping from the relay and remove the trip and intertrip links.
Carry out injection tests for each relay function, as described in this document
For all high current tests it must be ensured that the test equipment has the required rating and stability and that
the relay is not stressed beyond its thermal limit.
1.3.3
Primary Injection Tests
Primary injection tests are essential to check the ratio and polarity of the current transformers as well as the
secondary wiring. Primary injection testing of the 87BD Biased Differential protection is recommended to avoid
relay operation during first energisation of the transformer if incorrect values are applied to the ICT Connection
protection setting.
Note. If the current transformers associated with the protection are located in power transformer bushings it may
not be possible to apply test connections between the current transformer and the power transformer windings.
Primary injection is needed however, to verify the polarity of the CTs. In these circumstances primary current
must be injected through the associated power transformer winding. It may be necessary to short circuit another
winding in order to allow current to flow. During these primary injection tests the injected current is likely to be
small due to the impedance of the transformer.
Phase current transformer polarities and connections can be checked by examination of the relay Current Meters
and Differential Meters in the Instruments Menu when the protected plant is carrying load but Earth Fault CT
polarity can only be checked during primary injection.
1.3.4
Putting into Service
After tests have been performed satisfactorily the relay should be put back into service as follows:Remove all test connections.
Replace all secondary circuit fuses and links, or close m.c.b.
Ensure the Protection Healthy LED is on, steady, and that all LED indications are correct. If necessary press
CANCEL until the Relay Identifier screen is displayed, then press TEST/RESET to reset the indication LEDs.
The relay meters should be checked in Instruments Mode with the relay on load
The relay settings should be downloaded to a computer and a printout of the settings produced. The installed
settings should then be compared against the required settings supplied before testing began. Automated setting
comparison can be carried out by ReyDisp using the Compare Settings Groups function in the Edit menu. Any
modified settings will be clearly highlighted.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 8 of 56
7SR242 Duobias Commissioning & Maintenance Guide
1.4
AC Energising Quantities
Voltage and current measurement for each input channel is displayed in the Instrumentation Mode sub-menus,
each input should be checked for correct connection and measurement accuracy by single phase secondary
injection at nominal levels. Ensure that the correct instrument displays the applied signal within limits of the
Performance Specification.
Applied Current
W1-IA
W1-IB
Applied
Voltage
W1-IC
IG1
W2-IA
W2-IB
W2-IC
IG2
V1(VX)
Secondary
Primary
Apply 3P balanced Current at nominal levels and ensure that the measured Zero Phase Sequence and Negative
Phase Sequence quantities are approximately zero.
ZPS
NPS
Current
©2010 Siemens Protection Devices Limited
Chapter 6 Page 9 of 56
7SR242 Duobias Commissioning & Maintenance Guide
1.5
Binary Inputs
The operation of the binary input(s) can be monitored on the ‘Binary Input Meters’ display shown in ‘Instruments
Mode’. Apply the required supply voltage onto each binary input in turn and check for correct operation.
Depending on the application, each binary input may be programmed to perform a specific function; each binary
should be checked to prove that its mapping and functionality is as set as part of the Scheme Operation tests.
Where the pick-up timers associated with a binary input are set these delays should be checked either as part of
the scheme logic or individually. To check a binary pick-up time delay, temporarily map the binary to an output
relay that has a normally open contact. This can be achieved in the Output Matrix sub-menu by utilising the BI n
Operated settings. Use an external timer to measure the interval between binary energisation and closure of the
output contacts. Similarly, to measure the drop-off delay, map to an output relay that has a normally closed
contact, time the interval between binary de-energisation and closure of the output contacts.
Note. The time measured will include an additional delay, typically less than 20ms, due to the response time of
the binary input hardware, software processing time and the operate time of the output relay.
BI
Tested
DO
Delay
Measure
d
PU
Delay
Measured
Notes (method of initiation)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
©2010 Siemens Protection Devices Limited
Chapter 6 Page 10 of 56
7SR242 Duobias Commissioning & Maintenance Guide
1.6
Binary Outputs
A minimum of six output relays are provided. Two of these have change over contacts, BO2 & BO3, one has a
normally closed contact, BO1 and the remainder have normally open contacts.
Care should be observed with regard to connected devices when forcing contacts to operate for test purposes.
Short duration energisation can cause contact failure due to exceeding the break capacity when connected to
inductive load such as electrically reset trip relays.
Close each output relay in turn from the ReyDisp Evolution PC programme, Relay – Control - Close output relay.
This function will energise the output for its minimum operate time. This time is specified in the Output Config Binary Output Config menu for each output relay and may be too short to measure with a continuity tester.
An alternative method of energising an output permanently so that wiring can be checked is to temporarily map
the relay being tested to the ‘Protection Healthy’ signal in the Output Matrix, as this signal is permanently
energised the mapped relay will be held energised, normally open contacts will be closed and vice versa.
BO
Checked
Notes (method of test)
1NC
2NO
2NC
3NO
3NC
4
5
6
7
8
9
10
11
12
13
14
1.7
Relay Case Shorting Contacts
CT inputs and terminals C25-C26 (Relay Withdrawn Alarm) are fitted with case mounted shorting contacts which
provide a closed contact when the relay is withdrawn from the case. The operation of these contacts should be
checked.
CT Shorting contacts checked
Relay Withdrawn Alarm Checked
©2010 Siemens Protection Devices Limited
Chapter 6 Page 11 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Section 2: Protection Functions
This section details the procedures for testing each protection function of the 7SR24 relay. These tests are carried
out to verify the accuracy of the protection pick-ups and time delays at setting and to confirm correct operation of
any associated input and output functionality.
Guidance for calculating test input quantities is given in the relevant test description where required. In many
cases it may be necessary to disable some functions during the testing of other functions, this prevents any
ambiguity caused by the operation of multiple functions from one set of input quantities. The ‘Function Config’
Menu provides a convenient high level point at which all elements of a particular function can be
Enabled/Disabled to suit testing. The ‘Config’ tab in ‘ReyDisp Evolution’ can be used to ‘Enable/Disable’ individual
elements. Note that this screen disables functions by applying setting changes to the relay and that any changes
must be sent to the relay to take effect and settings must be returned to their correct value after testing.
Biased Diff.
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Phase OC
O
O
Derived E/F
O
O
O
Measured E/F
O
O
O
O
Restricted E/F
O
O
O
O
O
Open Circuit
O
O
O
O
NPS OC
O
O
O
O
O
Undercurrent
O
O
O
O
O
O
O
O
Thermal
O
O
O
O
O
O
O
O
O
U/O voltage
O
Neutral OV
O
U/O Frequency
O
Overfluxing
O
O
O
O
CB Fail
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
74TCS/74CCS
Inrush Detector
O/fluxing Detector
The General Pickup LED can be used to assess operation of functions during testing if other functions are
disabled or if the setting allocating General Pickup is temporarily modified.
Particular care should be taken when testing overcurrent functions that the thermal rating of the current inputs is
not exceeded.
It should be considered that where several overlapping elements are used simultaneously, the overall protection
operate time may be dependent on the operation of different individual elements at the various levels of applied
©2010 Siemens Protection Devices Limited
Chapter 6 Page 12 of 56
Overfluxing Detector
Inrush Detector
O
Diff. Highset
O
Trip cct Supervision
CB Fail
Overfluxing
U/O Frequency
Neutral Overvoltage
U/O voltage
Thermal
Undercurrent
NPS Overcurrent
Open Circuit
Restricted E/F
Measured E/F
Derived E/F
Test
Phase Overcurrent
Under
Differential Highset
Function
Biased Differential
The table below indicates functions where function conflicts may occur during testing, consideration should be
given to disabling functions to avoid interference.
7SR242 Duobias Commissioning & Maintenance Guide
current or voltage. The resulting composite characteristic may be tested by enabling all of the relevant applicable
elements or the element operations can be separated or disabled and tested individually.
All relay settings should be checked before testing begins. It is recommended that the relay settings are extracted
from the relay using ReyDisp Evolution software and a copy of these settings is stored for reference during and
after testing. It may be necessary to disable some protection functions during the testing of other functions to
allow unambiguous results to be obtained.
Care must be taken to reset or re-enable any settings that have been temporarily altered during the testing before
the relay can be put into service. At the end of testing the relay settings should be compared to the file extracted
at the start to ensure that errors have not been introduced.
An example ‘Test Sheet’ summary document is included at the end of this Guide.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 13 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.1
Biased Differential (87BD, 87HS)
Figure 2-1
Biased Differential
Voltage Inputs:
None
Current Inputs:
W1-IL1 (IA),W1-IL2 (IB),W1-IL3 (IC), and W2-IL1 (IA),W2-IL2 (IB),W2-IL3 (IC),
Disable:
46, 49, 50, 51, 50N, 51N, 50BF,
Map Pickup LED:
87BD, 87HS - Self Reset
The differential elements are subjected to CT multipliers, Vector Group Compensation and Zero Sequence filters
when applied to power transformers. The complexity of these features can cause confusion during testing and
lead to incorrect relay settings being applied. It is recommended that the accuracy of the differential elements are
tested by secondary injection with simplified differential settings applied to avoid ambiguity before reinstating the
required site settings which can be tested more thoroughly by primary injection followed by final checking with the
protected transformer on load.
2.1.1
Secondary Injection Testing
The settings used for Secondary Injection test purposes should be:
W1 ICT Multiplier
Connection
Multiplier
Connection
1x
Yy0,0deg
1x
Yy0,0deg
©2010 Siemens Protection Devices Limited
W1 ICT
W2 ICT
W2 ICT
Chapter 6 Page 14 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Secondary testing of the bias characteristic will be greatly simplified by the use of automated numeric protection
test equipment such as the Omicron CMC256. This equipment can be programmed using setting which match
those of the relay to test for accuracy over the whole operating range and give a clear easy to use graphical
display of relay performance against the specified characteristic.
The relay characteristic can however be tested manually by recording a sequence of operating points for
increasing levels of Restrain current. This can be achieved phase by phase using a single current source such as
a Variac with two independently variable current limiting resistors as shown in figure 2-2 or from two independent
single or three phase current sources. When two separate sources are used the phase of the two sinusoidal
supplies must be the same and the Restrain and Operate currents must be calculated from the sum and
difference of the two currents.
During manual testing the Operate and Restrain currents can be monitored on the relay in the Differential Meters
in the Instruments menu.
For manual testing, the bias slope is usually checked for Restrain current up to 250% of nominal current. For
testing above this level the continuous current rating of the relay inputs is likely to be exceeded, equipment or test
procedure should be arranged in such a way that the short term thermal withstand of the relay current inputs is
not exceeded during testing.
Figure 2-2
Secondary Injection using a Variac
2.1.1.1
Results for testing 87BD with a Variac
87BD 1ST BIAS SLOPE
87BD INITIAL
SETTING
SETTING
0.00
0.10
0.20
0.30
0.40
0.50
0.50
0.50
Selected Settings
0.10
0.20
0.30
0.40
0.50
0.60
0.70
BIAS CURRENT (X IN)
MEASURED ON AMMETER A1
1.00
1.50
2.00
Operate Current Measured on Ammeter A2
0.10
0.11
0.16
0.21
0.20
0.22
0.33
0.44
0.30
0.35
0.53
0.71
0.40
0.50
0.75
1.00
0.50
0.67
1.00
1.33
0.50
0.86
1.29
1.71
0.50
1.08
1.62
2.15
Test Results
0.00
1.00
1.50
2.00
2.50
0.26
0.56
0.88
1.25
1.67
2.14
2.69
2.50
Phase A Pickup
Phase B Pickup
Phase C Pickup
©2010 Siemens Protection Devices Limited
Chapter 6 Page 15 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.1.1.2
Results for testing 87BD with 2 current sources
87BD INITIAL
SETTING
0.10
0.20
0.30
0.40
0.50
0.50
0.50
Selected Settings
87BD 1ST BIAS
SLOPE SETTING
W1 CURRENT (X IN)
0.00
1.00
W2 Current (x In)
0.1
1.11
0.2
1.22
0.3
1.35
0.4
1.5
0.5
1.67
0.5
1.86
0.5
2.08
Test Results
0.00
1.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
1.50
2.00
2.50
1.66
1.83
2.03
2.25
2.5
2.79
3.12
2.21
2.44
2.71
3.0
3.33
3.71
4.15
2.76
3.06
3.38
3.75
4.17
4.64
5.19
1.50
2.00
2.50
Phase A Pickup
Phase B Pickup
Phase C Pickup
2.1.1.3
Differential Highset 87HS
Differential Highset can be tested by single phase secondary current injection. 87HS settings will usually be
higher than the continuous thermal rating of the relay current inputs and equipment or test procedure should be
arranged in such a way that the short term thermal withstand of the relay current inputs is not exceeded during
testing. 50% of relay setting current can be injected into each of the 2 winding inputs simultaneously to achieve a
differential current level of 100% if test current is limited by test equipment capacity.
The settings used for Secondary Injection test purposes should be:
W1 ICT Multiplier
W1 ICT Connection
W2 ICT Multiplier
W2 ICT Connection
1x
Yy0,0deg
1x
Yy0,0deg
These settings ensure a 1:1 ratio between the injected current and the relay setting. Note that operation of the
element can be achieved at a lower level of current if a higher ICT multiplier setting is applied.
During testing the Operate current can be monitored on the relay in the Instruments menu.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 16 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.1.2
Primary Injection Testing
Primary injection is recommended to prove the relay connections, CT polarity and settings before putting the
protection scheme into service. Primary injection is essential to fully prove the connections of the Biased
Differential and REF protections. To provide a useful test the relay should have the final site specific settings
applied for primary injection tests.
WARNING!
It is important before carrying out any primary injection to ensure appropriate CTs are shorted to avoid operation
of mesh corner or busbar type unit protection. If the injected primary current is large enough, the bus zones
protection may operate.
Sufficient primary current to prove the connections and settings is required so that a minimum secondary current
of about 10mA rms circulates in the relay inputs. This is difficult to achieve using high current primary injection
equipment due to the relatively high impedance of the transformer windings. An alternative method is to apply 415
LVAC to one side of the transformer with a short circuit applied to the other side. The external three-phase
primary short is usually applied to the HV side so that the LVAC supply is connected to the winding with lowest
impedance which will result in a higher current level. The test current that will be produced can be predicted
based on the impedance of the transformer and the applied test voltage. The primary test current is injected
through all of the biased differential CT’s on the LV side.
Injection of 3 phase current in this way will simulate balanced load conditions, or through fault. During injection,
check that the W1 and W2 relay currents are in anti-phase by examination of the relay ‘Differential Meters’ in
‘Instruments Mode’. Check each phase in turn, ensuring that the phase angle for ‘W1 Relay’ is in anti-phase with
‘W2 Relay’.
When the transformer is eventually energised and carrying load current, the above examination of the W1 and W2
relay current phase angle should be re-checked for anti-phase to ensure that the correct ICT Connection settings
are applied to the differential protection.
It should be noted that checking of Vector Grouping by phase alignment between W1 and W2 by 3 phase primary
injection or on-load will highlight phase cross-over or connection polarity but will not show incorrect application of
zero sequence filters.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 17 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.1.3
Phase Overcurrent (50, 51)
Figure 2-3
Phase Overcurrent
Voltage Inputs:
None
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC),
Disable:
46, 49, 50BF, 87BD, 87HS
Map Pickup LED:
51-n/50-n - Self Reset
Other protection functions may overlap with these functions during testing, it may be useful to disable some
functions to avoid ambiguity.
These elements can be allocated to W1 or W2 current inputs by relay settings, ensure that current is injected on
the correct input.
Particular care should be taken when testing overcurrent functions that the thermal rating of the current inputs is
not exceeded.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 18 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.1.4
Definite Time Overcurrent
(50)
If DTL setting is small, gradually increase current until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, check operation
Apply 2x setting current if possible and record operating time
Phas
e
IL1(IA)
Dir.
Is
(Amps)
DTL
(sec)
P.U. Current
Amps
Operate Time
2 x Is
NOTES
IL2(IB)
IL3(IC)
Check correct indication, trip output, alarm contacts, waveform record.
2.1.5
Inverse Time Overcurrent (51)
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up LED to operate for the function.
Gradually increase current until Pickup LED operates.
Apply 2x setting current and record operating time,
Apply 5x setting current and record operating time.
Compare to calculated values for operating times
Ph.
P.U.
D.O.
&
TIMIN
G
TESTS
Dir
Char.
(NI EI VI
LTI, DTL)
Is
(A)
TM
Operate Current
P.U.
D.O.
(Amps) (Amps)
Operate Time
2 x Is 5 x Is
(sec) (sec)
NOTES
IL1(IA)
IL2(IB)
IL3(IC)
Calculated Timing values in seconds for TM =1.0
Curve
2 xIs
5 xIs
IEC-NI
10.03
4.28
IEC-VI
13.50
3.38
IEC-EI
26.67
3.33
IEC-LTI
120.00
30.00
ANSI-MI
3.80
1.69
ANSI-VI
7.03
1.31
ANSI-EI
9.52
1.30
Note that the operate time may be subject to the Minimum op time setting for the element and/or may have a
Follower DTL applied.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 19 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.1.5.1 Element Blocking
The Phase Overcurrent elements can be blocked by Binary Input Inhibit and Inrush Detector operation. This
functionality should be checked.
Element
BI Inhibits
Inrush Detector
51-1
51-2
50-1
50-2
2.1.5.2 ANSI Reset
If the element is configured as an ANSI characteristic, it may have an ANSI (decaying) reset delay applied. If
ANSI reset is selected for an IEC characteristic element, the reset will be instantaneous.
ANSI reset times from operated condition to fully reset are as follows for zero applied current and Time multiplier
(TM) = 1.0. The reset curve characteristic type and TM is defined by the operating characteristic.
Curve
Fully operated to reset with Zero current applied & TM=1 (secs)
ANSI-MI
4.85
ANSI-VI
21.6
ANSI-EI
29.1
Apply current in the following sequence, a) 2x setting for a time to ensure element operation, b) Zero current for
the reset time above (xTM), c) 2x setting for a time to ensure element operation. Check that the second operation
(c) is similar to the first (a) and in line with the expected operate time for the element at this current level.
Repeat the test with the reset time (b) reduced to 50% of the previous value. Ensure that the second operate time
(c) is 50% of the first (a) operate time.
Operate time
(expected)
Reset time
(calculated)
Operate time
(measured)
50% Reset
Time
(calculated)
First test (c)
50% operate
time
(calculated)
50% operate
time
(measured)
Second Test (c)
Check correct indication, trip output, alarm contacts, waveform record.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 20 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.2
Derived Earth fault (50N,51N)
Figure 2-4 Measured Earth Fault
Voltage Inputs:
None
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC),
Disable:
50BF, 50, 51, 49, 37
Map Pickup LED:
51N-n/50N-n - Self Reset
Other protection functions may overlap with these functions during testing, it may be useful to disable some
functions to avoid ambiguity. Measured EF & Restricted EF protections can be Enabled/Disabled individually or
as groups in the ‘Function Config’ menu.
These elements can be allocated to W1 or W2 current inputs by relay settings, ensure that current is injected on
the correct input.
Derived EF elements can be separated from Measured EF by secondary injection of current through the phase
input circuit only.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 21 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.2.1
Definite Time Overcurrent
(50N)
If DTL setting is small, gradually increase current until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, check operation
Apply 2x setting current if possible and record operating time
Input
Is
(Amps)
DTL
(sec)
P.U. Current
Amps
Operate Time
2 x Is
NOTES
Check correct indication, trip output, alarm contacts, waveform record.
2.2.2
Inverse Time Overcurrent (51N)
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up led to operate for the function.
Gradually increase current until Pickup LED operates.
Apply 2x setting current and record operating time,
Apply 5x setting current and record operating time.
Compare to calculated values for operating times
P.U.
D.O.
&
TIMIN
G
TEST
S
Input
Char.
(NI EI VI
LTI, DTL)
Is
(A)
T.M.
Operate Current
P.U.
(Amps)
Calculated Timing values in seconds for TM =1.0
Curve
2 xIs
Operate Time
D.O.
(Amps)
NOTES
2 x Is
(sec)
5 x Is
(sec)
5 xIs
IEC-NI
10.03
4.28
IEC-VI
13.50
3.38
IEC-EI
26.67
3.33
IEC-LTI
120.00
30.00
ANSI-MI
3.80
1.69
ANSI-VI
7.03
1.31
ANSI-EI
9.52
1.30
Note that the operate time may be subject to the Minimum op time setting for the element and/or may have a
Follower DTL applied.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 22 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.2.2.1
Element Blocking
The Measured Earth Fault elements can be blocked by Binary Input Inhibit, VT Supervision and Inrush Detector
operation. The Characteristic can be made non-directional by VT Supervision. This functionality should be
checked.
Element
BI Inhibits
Inrush Detector
51N-1
51N-2
51N-3
51N-4
50N-1
50N-2
50N-3
50N-4
2.2.3
ANSI Reset
If the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selected
for an IEC characteristic element, the reset will be instantaneous.
ANSI reset times from operated condition to fully reset are as follows for zero applied current and TM = 1.0. The
reset curve characteristic type and TM is defined by the operating characteristic.
Curve
Fully operated to reset with Zero current applied & TM=1 (secs)
ANSI-MI
4.85
ANSI-VI
21.6
ANSI-EI
29.1
Apply current in the following sequence, a) 2x setting for a time to ensure element operation, b) Zero current for
the reset time above (xTM), c) 2x setting for a time to ensure element operation. Check that the second operation
(c) is similar to the first (a) and in line with the expected operate time for the element at this current level.
Repeat the test with the reset time (b) reduced to 50% of the previous value. Ensure that the second operate time
(c) is 50% of the first (a) operate time.
Operate time
(expected)
Reset time
(calculated)
Operate time
(measured)
50% Reset
Time
(calculated)
First test (c)
50% operate
time
(calculated)
50% operate
time
(measured)
Second Test (c)
Check correct indication, trip output, alarm contacts, waveform record.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 23 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.3
Measured Earth fault (50G, 51G)
Figure 2-5 Measured Earth Fault
Voltage Inputs:
None
Current Inputs:
IG1 , IG2
Disable:
50BF, 64H
Map Pickup LED:
51G-n/50G-n - Self Reset
Other protection functions may overlap with these functions during testing, it may be useful to disable some
functions to avoid ambiguity. Derived EF, Measured EF & Restricted EF protections can be Enabled/Disabled
individually or as groups in the ‘Function Config’ menu.
These elements can be allocated to IG1 or IG2 current inputs by relay settings, ensure that current is injected on
the correct input.
Measured EF elements can be separated from Derived EF by secondary injection of current through the IG1 or IG2
input circuit only.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 24 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.3.1
Definite Time Overcurrent
(50G)
If DTL setting is small, gradually increase current until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, check operation
Apply 2x setting current if possible and record operating time
Input
Is
(Amps)
DTL
(sec)
P.U. Current
Amps
Operate Time
2 x Is
NOTES
IG1
Check correct indication, trip output, alarm contacts, waveform record.
2.3.2
Inverse Time Overcurrent (51G)
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up LED to operate for the function.
Gradually increase current until Pickup LED operates.
Apply 2x setting current and record operating time,
Apply 5x setting current and record operating time.
Compare to calculated values for operating times
P.U.
D.O.
&
TIMING
TESTS
Input
Char.
(NI EI VI
LTI, DTL)
Is
(A)
T.M.
Operate Current
P.U.
D.O.
(Amps)
(Amps)
Operate Time
2 x Is
5 x Is
(sec)
(sec)
NOTES
IG1
Calculated Timing values in seconds for TM =1.0
Curve
2 xIs
5 xIs
IEC-NI
10.03
4.28
IEC-VI
13.50
3.38
IEC-EI
26.67
3.33
IEC-LTI
120.00
30.00
ANSI-MI
3.80
1.69
ANSI-VI
7.03
1.31
ANSI-EI
9.52
1.30
Note that the operate time may be subject to the Minimum op time setting for the element and/or may have a
Follower DTL applied.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 25 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.3.2.1
Element Blocking
The Measured Earth Fault elements can be blocked by Binary Input Inhibit, VT Supervision and Inrush Detector
operation. The Characteristic can be made non-directional by VT Supervision. This functionality should be
checked.
Element
BI Inhibits
Inrush Detector
51G-1
51G-2
51G-3
51G-4
50G-1
50G-2
50G-3
50G-4
2.3.3
ANSI Reset
If the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selected
for an IEC characteristic element, the reset will be instantaneous.
ANSI reset times from operated condition to fully reset are as follows for zero applied current and TM = 1.0. The
reset curve characteristic type and TM is defined by the operating characteristic.
Curve
Fully operated to reset with Zero current applied & TM=1 (secs)
ANSI-MI
4.85
ANSI-VI
21.6
ANSI-EI
29.1
Apply current in the following sequence, a) 2x setting for a time to ensure element operation, b) Zero current for
the reset time above (xTM), c) 2x setting for a time to ensure element operation. Check that the second operation
(c) is similar to the first (a) and in line with the expected operate time for the element at this current level.
Repeat the test with the reset time (b) reduced to 50% of the previous value. Ensure that the second operate time
(c) is 50% of the first (a) operate time.
Operate time
(expected)
Reset time
(calculated)
Operate time
(measured)
50% Reset
Time
(calculated)
First test (c)
50% operate
time
(calculated)
50% operate
time
(measured)
Second Test (c)
Check correct indication, trip output, alarm contacts, waveform record.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 26 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.4
Restricted Earth fault (64H)
Figure 2-6 Restricted Earth Fault
Voltage Inputs:
n/a
Current Inputs:
IG1 , IG2
Disable:
50G, 51G, 50BF
Map Pickup LED:
64H-n - Self Reset
The external stabilising resistor value should be measured and compared to that specified in the settings data.
Both values should be recorded.
Element
Settings Data: RSTAB Value
RSTAB Measured
64H-1
64H-2
The relatively high value of stabilising resistance RSTAB will often interfere with secondary current injection when
using a digital test set. It is normal practice in these cases to short circuit the resistor to allow testing, the shorting
link should be removed after testing.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 27 of 56
7SR242 Duobias Commissioning & Maintenance Guide
These elements can be enabled for the IG1 or IG2 current inputs by relay settings, ensure that current is injected on
the correct input.
Since the DTL setting is generally small the pick-up setting can be tested by gradually increasing current until
element operates. The relay should be disconnected from the current transformers for this test.
Apply 2x setting current if possible and record operating time
Is
(Amps)
DTL
(sec)
P.U. Current
Amps
Operate Time
2 x Is
NOTES
64H-1
64H-2
It is also desirable to check the operating voltage achieved with the setting resistor and all parallel CTs connected
but de-energised. A higher capacity test set will be required for this test. Adequate current must be supplied to
provide the magnetising current of all connected CTs. Precautions should be taken to ensure that no personnel
are at risk of contact with any of the energised secondary wiring during the test.
Settings Data:
VS Measured
Voltage Setting (VS)
Settings Data:
IOP Measured
Operate Current (IOP)
64H-1
64H-2
To complete testing of the REF requires primary injection through the phase and residual (REF) CT in series to
simulate an out of zone fault and ensure stability of the relay. The test can then be repeated with the REF CT
secondary connections reversed to prove operation.
2.4.1.1
Element Blocking
The Restricted Earth Fault element can be blocked by Binary Input Inhibit. Where applied this functionality should
be checked.
Element
BI Inhibits
Checked
64H-1
64H-2
Check correct indication, trip output, alarm contacts, waveform record.
Check that any shorting links are removed after testing.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 28 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.5 Open Circuit (46BC)
Figure 2-7 Open Circuit
Voltage Inputs:
n/a
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC),
Disable:
51N, 46IT, 46DT
Map Pickup LED:
46BC - Self Reset
This function uses the ratio of NPS current to PPS current to detect an open circuit . These quantities can be
produced directly from many advanced test sets but with limited equipment the following approach can be
applied.
Apply 3P balanced current with normal phase rotation direction. This current will consist of PPS alone, no NPS or
ZPS.
Increase 1 phase current magnitude in isolation to produce NPS. The single phase unbalance current will contain
equal quantities of ZPS, NPS and PPS. The NPS component will be 1/3 of the unbalance current and the total
PPS component will be value of the original balanced 3P current plus 1/3 of the additional unbalance current. i.e.
as the single phase unbalance current increases, the ratio of NPS to PPS will also increase. The levels of each
sequence component current can be monitored in the Current Meters in Instruments Mode.
Inject 1A of balanced current. Gradually increase imbalance current, operating level should be as follows:
©2010 Siemens Protection Devices Limited
Chapter 6 Page 29 of 56
7SR242 Duobias Commissioning & Maintenance Guide
46BC Setting
1P unbalance current
(% of 3P current)
46BC Setting
20%
75%
25%
100%
30%
129%
35%
161%
40%
200%
3P balanced current (A)
1P unbalance current (A)
Measured Unbalance
current
46BC-1
46BC-2
Apply 1A 1P unbalance current without 3P balanced current. Measure 46BC operating time.
46BC Delay setting
Measured
46BC-1
46BC-2
2.5.1.1
Element Blocking
Elements can be blocked by operation of a Binary Input Inhibit or by operation of the 46BC-n U/I Guard element.
This functionality should be checked.
Element
BI Inhibits
U/I Guard
NOTES
46BC-1
46BC-2
©2010 Siemens Protection Devices Limited
Chapter 6 Page 30 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.6
Negative Phase Sequence Overcurrent (46NPS)
Figure 2-8 Negative Phase Sequence Overcurrent
Voltage Inputs:
n/a
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC),
Disable:
50, 51, 50BF, 87BD
Map Pickup LED:
46IT/46DT - Self Reset
Where two NPS elements are being used with different settings, it is convenient to test the elements with the
highest settings first. The elements with lower settings can then be tested without disabling the lower settings.
The Thermal withstand limitations of the current inputs, stated in the Performance Specification should always be
observed throughout testing.
These elements can be allocated to W1 or W2 current inputs by relay settings, ensure that current is injected on
the correct input.
NPS Overcurrent can be tested using a normal 3P balanced source. Two phase current connections should be
reversed so that the applied balanced 3P current is Negative Phase Sequence.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 31 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.6.1
Definite Time NPS Overcurrent
(46DT)
If DTL setting is small, gradually increase current until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, check operation
Apply 2x setting current if possible and record operating time
Phase
Is
(Amps)
DTL
(sec)
P.U. Current
Amps
Operate Time
2 x Is
NOTES
NPS
Check correct indication, trip output, alarm contacts, waveform record.
2.6.2
Inverse Time NPS Overcurrent (46IT)
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up led to operate for the function.
Gradually increase current until Pickup LED operates.
Apply 2x setting current and record operating time,
Apply 5x setting current and record operating time.
Compare to calculated values for operating times
Ph.
P.U.
D.O.
&
TIMING
TESTS
Char.
(NI EI VI LTI,
DTL)
Is
(A)
TM
Operate Current
P.U.
D.O.
(Amps)
(Amps)
Operate Time
2 x Is
5 x Is
(sec)
(sec)
NOTES
NPS
Calculated Timing values in seconds for TM =1.0
Curve
2 xIs
5 xIs
IEC-NI
10.03
4.28
IEC-VI
13.50
3.38
IEC-EI
26.67
3.33
IEC-LTI
120.00
30.00
ANSI-MI
3.80
1.69
ANSI-VI
7.03
1.31
ANSI-EI
9.52
1.30
Note that the operate time may be subject to the Minimum op time setting for the element and/or may have a
Follower DTL applied.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 32 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.6.2.1 ANSI Reset
If the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selected
for an IEC characteristic element, the reset will be instantaneous.
ANSI reset times from operated condition to fully reset are as follows for zero applied current and TM = 1.0. The
reset curve characteristic type and TM is defined by the operating characteristic.
Curve
Fully operated to reset with Zero current applied & TM=1 (secs)
ANSI-MI
4.85
ANSI-VI
21.6
ANSI-EI
29.1
Apply current in the following sequence, a) 2x setting for a time to ensure element operation, b) Zero current for
the reset time above (xTM), c) 2x setting for a time to ensure element operation. Check that the second operation
(c) is similar to the first (a) and in line with the expected operate time for the element at this current level.
Repeat the test with the reset time (b) reduced to 50% of the previous value. Ensure that the second operate time
(c) is 50% of the first (a) operate time.
Operate time
(expected)
Reset time
(calculated)
Operate time
(measured)
50% Reset
Time
(calculated)
First test (c)
50% operate
time
(calculated)
50% operate
time
(measured)
Second Test (c)
2.6.2.2 Element Blocking
The NPS Overcurrent elements can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
46IT
46DT
Check correct indication, trip output, alarm contacts, waveform record.
When testing is complete reinstate any of the disabled functions.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 33 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.7
Undercurrent (37, 37G)
Figure 2-9 Undercurrent
2.7.1
Voltage Inputs:
n/a
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), IG1 or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC), IG2
Disable:
50N, 51N, 51G, 46, 87BD
Map Pickup LED:
37-n, 37G-n - Self Reset
37-n Elements
If two Undercurrent 37 elements are used with different settings, it is convenient to test the element with the
lowest setting first. The higher setting element can then be tested without interference from the other element.
These elements can be allocated to W1 or W2 current inputs by relay settings, ensure that current is injected on
the correct input.
Apply 3P balanced current at a level above the 37-n setting until the element resets.
If DTL setting is small, gradually reduce any each phase current in turn until element operates.
If DTL is large apply 1.1x setting, check for no operation, apply 0.9x setting, check operation
Testing of these elements phase by phase may cause inadvertent operation of the 46 NPS Overcurrent elements.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 34 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Apply 0.5x setting current and record operating time
Phase
Is
(Amps)
DTL
(sec)
P.U. Current
Amps
Operate Time
0.5 x Is
NOTES
Wn-IL1(IA)
Wn-IL2(IB)
Wn-IL3(IC)
Wn-IL1(IA)
Wn-IL2(IB)
Wn-IL3(IC)
Elements can be blocked by operation of a Binary Input Inhibit or by operation of the 37-n U/I Guard element.
This functionality should be checked.
Element
BI Inhibits
U/I Guard
NOTES
37-1
37-2
Check correct indication, trip output, alarm contacts, waveform record.
2.7.2
37G-n Elements
Apply current to the IGn input at a level above the 37G-n setting until the element resets.
If DTL setting is small, gradually reduce current until element operates.
If DTL is large apply 1.1x setting, check for no operation, apply 0.9x setting, check operation
Apply 0.5x setting current and record operating time
Phase
Is
(Amps)
DTL
(sec)
P.U. Current
Amps
Operate Time
0.5 x Is
NOTES
IG
IG
Elements can be blocked by operation of a Binary Input Inhibit.
This functionality should be checked.
Element
BI Inhibits
NOTES
37G-1
37G-2
Check correct indication, trip output, alarm contacts, waveform record.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 35 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.8
Thermal Overload (49)
Figure 2-10 Thermal Overload
Voltage Inputs:
n/a
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC),
Disable:
51, 50, 37, 46NPS, 50CBF, 87BD
Map Pickup LED:
49 Alarm
The current can be applied from a 3P balanced supply or phase by phase from a 1P supply. Alternatively the 3
phase current inputs can be connected in series and injected simultaneously from a single 1P source.
This elements can be allocated to W1 or W2 current inputs by relay settings, ensure that current is injected on the
correct input.
The Thermal Overload Setting and Time Constant Setting can be considered together to calculate the operating
time for a particular applied current.
The following table lists operate times for a range of Time Constant Settings for an applied current of 2x the
Thermal Overload setting. Ensure that the thermal rating of the relay is not exceeded during this test.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 36 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Time Constant (mins)
Operate Time (sec)
1
17.3
2
34.5
3
51.8
4
69
5
86.3
10
173
15
259
20
345
25
432
30
51.8
50
863
100
1726
The Thermal State must be in the fully reset condition in order to measure the operate time correctly. This can be
achieved by setting change in the Thermal protection settings menu or by pressing the Test/Reset button when
the Thermal Meter is shown in the Instruments Mode.
Reset the thermal State then apply 2x the Overload Setting current.
Calculated Operate Time (s)
Measured Operate Time (s)
If the Thermal Overload Capacity Alarm is used, this can be tested by monitoring the Thermal Capacity in the
instruments menu. If the Thermal time constant is longer than a few minutes, this can be assessed during the
timing test above. If the Time Constant is less than a few minutes, a lower multiple of current will be required such
that the rate of capacity increase is slowed to allow monitoring of the instrument to be accurate.
Capacity Alarm Setting
2.8.1.1
Measured
Element Blocking
The Thermal element can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
49
©2010 Siemens Protection Devices Limited
Chapter 6 Page 37 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.9
Under/Over Voltage (27/59)
Figure 2-11 Phase Under/Over Voltage
Voltage Inputs:
V1 (VX)
Current Inputs:
n/a apply zero current to stabilize other functions
Disable:
Map Pickup LED:
59N
27/59-n - Self Reset
Where more than one Undervoltage (27) elements are being used with different settings, it is convenient to test
the elements with the lowest settings first. The elements with higher settings can then be tested without disabling
the lower settings.
Note that if the voltage is reduced below the 27UVG setting, the function may be blocked. Current inputs are not
required to stabilise the relay during voltage element testing.
If the DTL is short, starting from nominal voltage, slowly decrease the applied test voltage until the Pickup LED
(temporarily mapped) is lit. Record the operate voltage. The LED should light at setting Volts +/-5%. Slowly
increase the input voltage until the LED extinguishes. Record the reset voltage to check the ‘Hysteresis’ setting. If
the DTL is long, the operate level should be checked by applying a voltage of 90% of setting voltage. Check
Hysteresis by resetting element to the operate level setting plus the hysteresis setting.
Connect the relevant output contact(s) to stop the test set. Step the applied voltage to a level below the setting.
The test set should be stopped at the operate time setting +/-5%
©2010 Siemens Protection Devices Limited
Chapter 6 Page 38 of 56
7SR242 Duobias Commissioning & Maintenance Guide
When testing is complete reinstate any of the disabled functions.
Where more than one Overvoltage (59) elements are being used with different settings, it is convenient to test the
elements with the highest settings first. The elements with lower settings can then be tested without disabling the
higher settings.
If the ‘O/P Phases’ is set to ‘All’, the voltage on all phases must be increased simultaneously. Otherwise the 3
phases should be tested individually. If the DTL setting is short, starting from nominal voltage, slowly increase the
applied 3P or VL1 test voltage until the Pickup LED (temporarily mapped) is lit. The LED should light at setting
Volts +/-5% Decrease the input voltage to nominal Volts and the LED will extinguish. Record the reset voltage to
check the ‘Hysteresis’ setting. If the DTL setting is long, the operate level can be checked by applying 100% of
setting to cause operation followed by setting minus the Hysteresis setting to cause reset.
Connect the relevant output contact(s) to stop the test set. Step the applied voltage to a level above the setting.
The test set should be stopped at the operate time setting +/-5%
Test inputs VL2 and VL3 by repeating the above if necessary.
Phase
27/59
settin
g
(Volts)
U/
O
DTL
(sec)
Hyst.
D.O.
(calculated)
P.U.
Volts
D.O
Volts
Op. Time
2x Vs (OV)
0.5x Vs
(UV)
UV
Guard
NOTES
V1(VX)
2.9.1.1
Element Blocking
The NPS Overcurrent elements can be blocked by Binary Input Inhibit and VT Supervision. This functionality
should be checked.
Element
BI Inhibits
27/59-1
27/59-2
27/59-3
27/59-4
When testing is complete reinstate any of the disabled functions.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 39 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.9.2 Undervoltage Guard (27/59UVG)
If any 27 Undervoltage element is set to be inhibited by the 27 Undervoltage Guard element, this function should
be tested.
Connect the test voltage inputs to suit the installation wiring diagram utilising any test socket facilities available. It
may be useful to temporarily map an LED as ‘General Pickup’ to assist during testing. 27UVG operation will reset
the General Pickup if no other element is operated. This LED should not be set as ‘Hand Reset’ in the Output
matrix.
Starting from nominal voltage, apply a step decrease to the applied voltage to a level below the 27 Undervoltage
setting but above the 27UVG setting such that an Undervoltage element operation occurs. Slowly reduce the
applied voltage until the 27 Undervoltage element resets, this can be detected by the General Pickup LED reset if
no other element is operated (this includes any Undervoltage element which is not UV Guarded).
Phase
Vs
(Volts
)
V element
Used for test
Blocked
Volts
NOTES
UVG
©2010 Siemens Protection Devices Limited
Chapter 6 Page 40 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.10 Neutral Over Voltage (59N)
Figure 2-12 Neutral Overvoltage
Voltage Inputs:
V1 (VX)
Current Inputs:
n/a apply zero current to stabilize other functions
Disable:
Map Pickup LED:
27/59
59N-n - Self Reset
©2010 Siemens Protection Devices Limited
Chapter 6 Page 41 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.10.1 Definite Time (59NDT)
If DTL setting is small, gradually increase single phase voltage until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, check operation
Apply 2x setting voltage if possible and record operating time
Phase
Vs
(Volts)
DTL
(sec)
P.U. Current
Volts
Operate Time
2 x Vs
NOTES
V1(VX)
Check correct indication, trip output, alarm contacts, waveform record.
2.10.2 Inverse Time (59NIT)
It will be advantageous to map the function being tested to temporarily drive the relevant Pickup output in the
Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up LED to operate for the function.
Gradually increase voltage until Pickup LED operates.
Apply 2x setting voltage and record operating time,
Apply a higher multiple of setting voltage and record operating time.
Compare to calculated values for operating times from:
ª 1 º
top sec onds ) M « Vn
»
¬ >Vs @ 1¼
Where M = Time multiplier and Vn/Vs = multiple of setting.
Ph.
Vs
(V)
TM
Operate Voltage
P.U.
D.O.
(Volts) (Volts)
Operate Time
2 x Vs
x Vs
(sec)
(sec)
NOTES
V1(V
X)
2.10.2.1
Element Blocking
The Neutral Overvoltage elements can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
59NIT
59NDT
Check correct indication, trip output, alarm contacts, waveform record.
When testing is complete reinstate any of the disabled functions.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 42 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.11 Under/Over Frequency (81)
Figure 2-13 Under/Over Frequency
Voltage Inputs:
V1 (VX)
Current Inputs:
n/a apply zero current to stabilize other functions
Disable:
Map Pickup LED:
81-n - Self Reset
For Over-frequency, the elements with the highest setting should be tested first and for Under-frequency the
elements with the lowest settings should be tested first. The elements with other settings can then be tested
without need to disable the elements already tested. Note that the relay is designed to track the gradual changes
in power system frequency and that sudden step changes in frequency during testing do not reflect normal
system operation. Normal ‘instantaneous’ operation of the frequency element is 140-175ms in line with the
Performance Specification. Application of sudden step changes to frequency can add additional delay which can
produce misleading test results.
Gradually increase/decrease applied voltage frequency until 81-n operation occurs. Elements set for more
extreme frequency fluctuation should be tested first with lesser elements disabled.
If the 81-n Delay setting is long it will be advantageous to map the function to temporarily drive the relevant
Pickup output in the Pickup Config sub-menu in the Output Config menu as this will allow the Pick-up LED to
operate for the function. If the delay setting is short the operation of the element can be easily checked directly.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 43 of 56
7SR242 Duobias Commissioning & Maintenance Guide
The frequency should then be gradually decreased/increased until the element resets. The reset frequency can
be used to check the Hysteresis setting.
If the element is set as 81-n U/V Guarded, The applied voltage must be above the 81 UV Guard Setting in the
U/O Frequency menu.
Apply setting frequency +0.5Hz for Over-frequency or -0.5Hz for Under-frequency and record operating time.
Starting with the element in the operated condition, gradually increase or decrease the applied voltage until the
element resets. Measure the reset voltage level to check the 81 Hysteresis setting.
F
(Hertz)
U/O
DTL
(sec)
Hyst.
D.O.
(calc.)
P.U.
Freq
Hertz
D.O.
Freq.
Hertz
Operate
Time
+/- 0.5Hz
UV
Guard
NOTES
If the element is set as 81-nU/V Guarded, this setting can be tested by applying the test voltage at a level below
the 81 U/V Guard Setting at a frequency in the operate range. Increase the voltage until the relay operates.
UVG
UVG Setting
(Volts)
Freq element
Used for test
Blocked
Volts (D.O.)
Unblocked Volts (P.U.)
NOTES
U/O Freq
2.11.1.1
Element Blocking
The U/O Frequency elements can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
81-1
81-2
81-3
81-4
81-5
81-6
Check correct indication, trip output, alarm contacts, waveform record.
When testing is complete reinstate any of the disabled functions.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 44 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.12 Overfluxing (24)
Figure 2-14 Under/Over Frequency
The settings are set in terms of V/f based on multiple of nominal voltage and frequency. Application of a voltage of
nominal voltage and frequency represents 1.0.
Testing is simplified by applying nominal frequency and increasing voltage only, such that the operating level is
simply the setting multiplied by Nominal Voltage.
2.12.1
definite time (24DT)
If DTL setting is small, gradually increase voltage until element operates.
If DTL is large apply 0.95x setting, check for no operation, apply 1.05x setting, check operation
Apply 0.9x voltage, increase to 1.1x setting and record operating time
Setting
(xVn)
Setting
(volts)
Hysteresis
(%)
Calculated
D.O.
(volts)
DTL
Setting
(sec)
P.U.
Volts
D.O.
Volts
Operate
Time
NOTES
Check correct indication, trip output, alarm contacts, waveform record.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 45 of 56
7SR242 Duobias Commissioning & Maintenance Guide
2.12.2
inverse time (24IT)
The inverse V/f element should be tested at each of the points specified by settings that constitute the overall
inverse characteristics.
Setting
(xVn)
Setting
(volts)
Hysteresis
(%)
Calculated
D.O.
(volts)
X0
Setting
(xVn)
Setting
(volts)
X1
DTL
Setting
(sec)
Y1
X2
Y2
X3
Y3
X4
Y4
X5
Y5
X6
Y6
©2010 Siemens Protection Devices Limited
Operate
Time
DTL
Setting
(sec)
Y0
P.U.
Volts
D.O.
Volts
Operate
Time
NOTES
NOTES
Chapter 6 Page 46 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Section 3: Supervision Functions
3.1
CB Fail (50BF)
Figure 3-1 CB Fail
Voltage Inputs:
n/a
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), IG1 or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC), IG2
Disable:
Map Pickup LED:
50BF-n-n - Self Reset
The circuit breaker fail protection time delays are initiated either from:
A binary output mapped as Trip Contact in the OUTPUT CONFIG>BINARY OUTPUT CONFIG menu,
or
A binary input mapped as 50BF Ext Trip in the INPUT CONFIG>INPUT MATRIX menu.
Or
A binary input mapped as 50BF Mech Trip in the INPUT CONFIG>INPUT MATRIX menu.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 47 of 56
7SR242 Duobias Commissioning & Maintenance Guide
These elements are operated from W1 and W2 current inputs, ensure that current is injected on the correct input
for the element being tested.
Apply a trip condition by injection of current to cause operation of a suitable protection element. Allow current to
continue after the trip at a level of 110% of the 50BF Setting current level on any phase. Measure the time for
operation of 50BF-1 Delay and 50BF-2 Delay. Repeat the sequence with the 50BF CB Faulty input energised and
ensure the 50BF-1 and 50BF-2 outputs operate without delay, by-passing the timer delay settings.
Repeat the sequence with current at 90% of the 50BF Setting current level after the element trip and check for no
CB Fail operation.
Repeat the sequence by injecting the current to I4 and using the 50BF-I4 Setting.
Setting (xIn)
Test Current
50BF-1
(110%)………….
50BF-1-I4
50BF-2
50BF-1 Delay……………
50BF-2 Delay……………….
(90%)…………...
No Operation
No Operation
50BF CB Faulty
Operation No Delay Operation No Delay (90%)…………...
No Operation
No Operation
50BF CB Faulty
Operation No Delay Operation No Delay (90%)…………...
No Operation
No Operation
50BF CB Faulty
Operation No Delay Operation No Delay (90%)…………...
No Operation
No Operation
50BF CB Faulty
Operation No Delay (110%)………….
(110%)………….
50BF-2-I4
(110%)………….
Operation No Delay If the circuit breaker can also receive a trip signal from a protection function where there is no increase in current,
this trip input should be mapped to 50BF Mech Trip in the INPUT CONFIG>INPUT MATRIX menu.
Initiate this binary input and simulate the circuit breaker remaining closed by ensuring the CB Closed binary Input
is energised and ensure operation of the 50BF-1 and 50BF-2 outputs after their programmed delays.
Mech Trip
50BF-1
50BF-2 Delay……………….
No Operation
No Operation
No Operation
No Operation
CB Closed
CB Open
50BF-2
50BF-1 Delay……………
CB Closed
CB Open
3.1.1.1 Element Blocking
The CB Fail function can be blocked by Binary Input Inhibit. This functionality should be checked.
Element
BI Inhibits
NOTES
50BF-1
50BF-2
©2010 Siemens Protection Devices Limited
Chapter 6 Page 48 of 56
7SR242 Duobias Commissioning & Maintenance Guide
3.2
Trip/Close Circuit Supervision (74TCS, 74CCS)
Figure 3-2 Trip Circuit Supervision
Voltage Inputs:
n/a
Current Inputs:
n/a
Disable:
Map Pickup LED:
74TCS-n/74CCS-n - Self Reset
The T/CCS-n Delay can be initiated by applying an inversion to the relevant status input and measured by
monitoring of the alarm output.
TCS-n Delay setting
Measured
CCS-n Delay setting
Measured
©2010 Siemens Protection Devices Limited
Chapter 6 Page 49 of 56
7SR242 Duobias Commissioning & Maintenance Guide
3.3
Magnetising Inrush Detector (81HBL2)
Figure 3-3 Magnetising Inrush Detector
Voltage Inputs:
n/a
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC)
Disable:
Map Pickup LED:
Logical operation of the harmonic blocking can be tested by injection of 2nd harmonic current (at 100Hz for 50Hz
relay) to cause operation of the blocking signals. Note that injection of any level of 2nd harmonic alone on a
current input will cause the block to be raised if the Cross or Phase blocking method is used since the harmonic
content on this input is 100%, i.e. greater than setting. Full wave rectified current contains mostly 2nd harmonic
and is the traditional method to generate it without advanced equipment.
If the Cross or Sum Blocking methods are used, fundamental frequency current can be injected into the other
winding simultaneously to operate protection elements if required to test the blocking operation. Care should be
taken that the thermal limits of the relay are not exceeded during these tests.
More advanced test equipment is required, with the facility to combine harmonic and fundamental frequencies of
current, to test the accuracy of setting for current level of the blocking element. Note that the 81HBL2 Setting is
nd
set as a fraction of the total current. e.g. 0.25A at 100Hz combined with 1A at 50Hz gives a 2 harmonic content
of 0.2 i.e. (0.25/(0.25+1.0)).
©2010 Siemens Protection Devices Limited
Chapter 6 Page 50 of 56
7SR242 Duobias Commissioning & Maintenance Guide
A compromise test can be made by the use of a diode to generate a half-wave rectified waveform from a
sinusoidal source. The half-wave rectified current will contain a combination of fundamental and harmonic
currents. The rectified waveform contains even harmonics higher than 2nd but the relationship between the 2nd
harmonic current content, the fundamental component and the total RMS current is as shown below. Note that
some protection elements can be set to operate on the RMS current or the Fundamental current and the applied
values are different when non-sinusoidal waveforms are applied. The Inrush Detector setting is based on the ratio
nd
of 2 harmonic to fundamental. This method is not suitable for use with constant current generating test sets such
as modern digital equipment.
Half Wave Rectified
nd
nd
Full Sine
RMS
Rectified RMS
Current
Fundamental
component
2 Harmonic
component
2 /Fundamental
1.0
0.5
0.5
0.212
0.424
Assuming that the Gn 81HBL2 Setting is less than 40%, inject half-wave rectified current at an RMS or
Fundamental component level above the element setting to prove that the block is applied and the element is
stable. Care should be taken that the thermal limits of the relay are not exceeded during these tests.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 51 of 56
7SR242 Duobias Commissioning & Maintenance Guide
3.4
Overfluxing Detector (81HBL5)
Figure 3-4 Magnetising Inrush Detector
Voltage Inputs:
n/a
Current Inputs:
W1-IL1 (IA), W1-IL2 (IB), W1-IL3 (IC), or W2-IL1 (IA), W2-IL2 (IB), W2-IL3 (IC)
Disable:
Map Pickup LED:
Logical operation of the harmonic blocking can be tested by injection of 5th harmonic current (at 250Hz for 50Hz
relay) to cause operation of the blocking signals. Note that injection of any level of 5th harmonic alone on a
current input will cause the block to be raised since the harmonic content on this input is 100%, i.e. greater than
setting.
Fundamental frequency current can be injected into the other winding simultaneously to operate the 87BD or
87HS protection elements if required to test the blocking operation. Care should be taken that the thermal limits of
the relay are not exceeded during these tests.
More advanced test equipment is required, with the facility to combine harmonic and fundamental frequencies of
current, to test the level of the blocking element. Note that the 81HBL5 Setting is set as a fraction of the total
current. e.g. 0.25A at 250Hz combined with 1A at 50Hz gives a 5th harmonic content of 0.2 i.e. (0.25/(0.25+1.0)).
©2010 Siemens Protection Devices Limited
Chapter 6 Page 52 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Section 4: Control & Logic Functions
4.1
Quick Logic
If this functionality is used, the logic equations may interfere with testing of other protection functions in the relay.
The function of the Quick Logic equations should be tested conjunctively with connected plant or by simulation to
assess suitability and check for correct operation on an individual basis with tests specifically devised to suit the
particular application.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 53 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Section 5: Testing and Maintenance
7SR24 relays are maintenance free, with no user serviceable parts.
5.1
Periodic Tests
During the life of the relay, it should be checked for operation during the normal maintenance period for the site
on which the product is installed. It is recommended the following tests are carried out:1. Visual inspection of the metering display
2. Operation of output contacts
3. Secondary injection of each element
5.2
Maintenance
Relay failure will be indicated by the ‘Protection Healthy’ LED being off or flashing. A message may also be
displayed on the LCD. In the event of failure Siemens Protection Devices Ltd. (or the nearest Siemens office)
should be contacted – see defect report sheet in section 5.3.
The relay should be returned as a complete unit. No attempt should be made to dismantle the unit to isolate and
return only the damaged sub-assembly. It may however be convenient to fit the withdrawable relay to the outer
case from a spare relay, to avoid the disturbance of relay panel wiring, for return to Siemens Protection Devices
Ltd. The withdrawable relay should never be transported without the protection of the outer case.
5.3
Table 5-1
Troubleshooting
Troubleshooting Guide
Observation
Action
Relay does not power up.
Check that the correct auxiliary DC voltage is applied and that the
polarity is correct.
Relay won’t accept the password.
The Password being entered is wrong. Enter correct password.
If correct password has been forgotten, note down the Numeric
Code which is displayed at the Change Password screen e.g.
Change password
= 1234567
To retrieve the password, communicate this code to a Siemens
Protection Devices Ltd. representative.
Protection Healthy LED flashes
General failure. Contact a Siemens Protection Devices Ltd.
representative.
LCD screen flashes continuously.
The LCD has many possible error messages which when
displayed will flash continuously. These indicate various processor
card faults.
General failure. Contact a Siemens Protection Devices Ltd.
representative.
Backlight is on but no text can be seen.
Adjust the contrast.
Scrolling text messages are unreadable.
Adjust the contrast.
Relay displays one instrument after
another with no user intervention.
This is normal operation, default instruments are enabled.
Remove all instruments from the default list and only add those
that are required.
(See Section 2: Settings and Instruments).
©2010 Siemens Protection Devices Limited
Chapter 6 Page 54 of 56
7SR242 Duobias Commissioning & Maintenance Guide
Observation
Action
Cannot communicate with the relay.
Check that all of the communications settings match those used
by ReyDisp Evolution.
Check that the Tx and Rx fibre-optic cables are connected
correctly. ( Tx –> Rx and Rx –> Tx ).
Check that all cables, modems and fibre-optic cables work
correctly.
Ensure that IEC 60870-5-103 is specified for the connected port
(COM1, COM2, COM3 or COM4).
Relays will not communicate in a ring
network.
Check that the Data Echo setting on all relays is set to ON.
Check that all relays are powered up.
Check that all relays have unique addresses.
Status inputs do not work.
Check that the correct DC voltage is applied and that the polarity
is correct.
Check that the status input settings such as the pick-up and dropoff timers and the status inversion function are correctly set.
Relay instrument displays show small
currents or voltages even though the
system is dead.
This is normal. The relay is displaying calculation noise. This will
not affect any accuracy claims for the relay.
If the above checklist does not help in correcting the problem please contact the local Siemens office or contact
PTD 24hr Customer Support, Tel: +49 180 524 7000, Fax: +49 180 524 2471, e-mail:
support.energy@siemens.com.
©2010 Siemens Protection Devices Limited
Chapter 6 Page 55 of 56
7SR242 Duobias Commissioning & Maintenance Guide
5.4
Defect Report
Please copy this sheet and use it to report any defect that may occur.
Customers Name & Address:
Contact Name:
Telephone No:
Fax No:
Supplied by:
Date when installed:
Site:
Circuit:
Software Version:
Article No:
Date Found:
During
Maintenance:
During
Commissioning:
Report Required: Y/N
From a System
Fault:
Product Name:
Other, please state:
Serial No:
Copy any message displayed by the relay:
Describe Defect:
Describe any other action taken:
Signature:
Please print name:
For Siemens Protection Devices Ltd. use only:
Date Received:
Contact Name: Reference No:
©2010 Siemens Protection Devices Limited
Date
Acknowledged:
Date:
Date of Reply:
Date Cleared:
Chapter 6 Page 56 of 56
7SR242 Duobias Applications Guide
7SR242 Duobias
Multi-Function 2-Winding Transformer Protection Relay
Document Release History
This document is issue 2010/02. The list of revisions up to and including this issue is:
2010/02
Document reformat due to rebrand
2010/02
Third issue. Software revision 2662H80001 R4c-3
2008/07
Second issue. Software revision 2662H80001R3d-2c.
2008/05
First issue
Software Revision History
2010/02
2662H80001 R4c-3
st
Revisions to: VT ratio settings, 87BD 1 bias slope limit setting
increments, CB fail function, LED CONFIG menu, DATA STORAGE
menu.
Added: Open circuit detection (46BC), CONTROL MODE menu,
Close circuit supervision (74CCS), Measured earth fault undercurrent
(37G), Pulsed output contacts.
2008/07
2662H80001R3d-2c.
Demand metering. Optional DNP3.0 data comms.
2008/05
2662H80001R3-2b
First Release
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Applications Guide
Contents
Document Release History....................................................................................................................1
Software Revision History.....................................................................................................................1
Contents ..................................................................................................................................................2
Section 1: Common Functions .............................................................................................................5
1.1 Multiple Settings Groups...........................................................................................................5
1.2 Binary Inputs .............................................................................................................................6
1.3 Binary Outputs ..........................................................................................................................9
1.4 LEDs .........................................................................................................................................9
Section 2: Protection Functions .........................................................................................................10
2.1 Overall Differential Protection (87)..........................................................................................10
2.1.1 ICT Settings for Current Magnitude Balance .............................................................11
2.1.2 ICT Settings for Vector Group Correction ..................................................................11
Interposing CT Selection Guide ..............................................................................................12
2.1.3 Biased Differential (87BD) Settings ...........................................................................13
2.1.4 Differential Highset (87HS) Settings ..........................................................................15
2.1.5 Example 1 – New Installation.....................................................................................16
Summary of Required Settings ...............................................................................................18
2.1.6 Example 2 – Relay Replacement Using Existing CTs ...............................................23
Summary of Protection Settings .............................................................................................25
2.2 Instantaneous OC/EF (50/50G/50N) ......................................................................................26
2.3 Time Delayed OC/EF (51/51G/51N) .......................................................................................26
2.3.1 Selection of Over-current Characteristics ..................................................................26
2.3.2 Reset Delay................................................................................................................28
2.4 High Impedance Restricted Earth Fault (64H)........................................................................29
2.5 Open Circuit (46BC)................................................................................................................31
2.6 Negative Phase Sequence Overcurrent (46NPS) ..................................................................31
2.7 Undercurrent (37)....................................................................................................................31
2.8 Thermal Overload (49)............................................................................................................32
2.8.1 Settings Guidelines ....................................................................................................32
2.9 Under/Over Voltage (27/59)....................................................................................................34
2.10 Neutral Overvoltage (59N) ......................................................................................................35
2.10.1 Application with Capacitor Cone Units.......................................................................36
2.10.2 Derived NVD Voltage .................................................................................................36
2.11 Under/Over Frequency (81) ....................................................................................................37
2.12 Over Fluxing Protection (24) ...................................................................................................38
Section 3: CT Requirements ...............................................................................................................39
3.1 CT Requirement for Differential Protection.............................................................................39
3.2 CT Requirements for High Impedance Restricted Earth Fault (64H) .....................................40
Section 4: Control Functions ..............................................................................................................41
4.1 User Defined Logic .................................................................................................................41
4.1.1 Auto-Changeover Scheme Example..........................................................................41
Section 5: Supervision Functions ......................................................................................................42
5.1 Inrush Detector (81HBL2) .......................................................................................................42
5.2 Overfluxing Detector (81HBL5)...............................................................................................43
5.3 Circuit Breaker Fail (50BF) .....................................................................................................44
Example of Required Settings (e.g. HV CB)...........................................................................45
5.4 Trip Circuit Supervision (74TCS) ............................................................................................46
©2010 Siemens Protection Devices Limited
Chapter 7 Page 2 of 56
7SR242 Duobias Applications Guide
5.4.1
5.4.2
Trip Circuit Supervision Connections .........................................................................46
Close Circuit Supervision Connections......................................................................48
Section 6: Application Considerations and Examples .....................................................................49
6.1 The Effects of An In Zone Earthing Transformer ....................................................................49
6.2 Protection of Star/Star Transformer With Tertiary ..................................................................51
Winding ...........................................................................................................................................51
6.3 Transformer with Primary Connections Crossed on Both Windings.......................................52
6.4 Transformer with Primary Connections Crossed on One .......................................................54
Winding ...........................................................................................................................................54
6.5 Protection of Auto Transformers .............................................................................................55
6.6 Reactor and Connections Protection ......................................................................................56
©2010 Siemens Protection Devices Limited
Chapter 7 Page 3 of 56
7SR242 Duobias Applications Guide
List of Figures
Figure 1-1 Example Use of Alternative Settings Groups ......................................................................5
Figure 1-2 Example of Transformer Alarm and Trip Wiring .....................................................................6
Figure 1-3 – Binary Input Configurations Providing Compliance with EATS 48-4 Classes
ESI 1 and ESI 2 ...................................................................................................................8
Figure 2-1 Procedure for calculating Overall Differential Protection Settings........................................10
Figure 2-2: 87BD Characteristic .............................................................................................................13
Figure 2-3: Differential Highset Characteristic .......................................................................................15
Figure 2-4 New Transformer Application ...............................................................................................16
Figure 2-5: AC Connections - Example 1...............................................................................................16
Figure 2-6 ICT Settings – Example 1 .....................................................................................................17
Figure 2-7: Relay Currents - Star Winding Internal Earth ......................................................................19
Figure 2-8: Relay Currents - Star Winding Internal Phase Fault............................................................20
Figure 2-9: Relay Currents - Delta Winding Internal Earth Fault ...........................................................21
Figure 2-10: Relay Currents - Delta Winding Internal Phase Fault........................................................21
Figure 2-11 Relay Replacement.............................................................................................................23
Figure 2-12: AC Connections - Example 2.............................................................................................23
Figure 2-13 Summary of ICT Settings....................................................................................................24
Figure 2-14 IEC NI Curve with Time Multiplier and Follower DTL Applied ............................................27
Figure 2-15 IEC NI Curve with Minimum Operate Time Setting Applied ..............................................27
Figure 2-16 Overcurrent Reset Characteristics......................................................................................28
Figure 2-17: REF Protection Applied to a Delta/Star Transformer.........................................................29
Figure 2-18: AC Connections: REF........................................................................................................29
Figure 2-19 Thermal Overload Settings .................................................................................................33
Figure 2-20 NVD Application..................................................................................................................35
Figure 2-21 NVD Protection Connections ..............................................................................................35
Figure 2-22 Load Shedding Scheme Using Under-Frequency Elements ..............................................37
Figure 3-1 CT Requirements..................................................................................................................40
Figure 4-1 Example Use of Quick Logic.................................................................................................41
Figure 5-1 - Circuit Breaker Fail .............................................................................................................44
Figure 5-2 - Single Stage Circuit Breaker Fail Timing............................................................................44
Figure 5-3 - Two Stage Circuit Breaker Fail Timing ...............................................................................45
Figure 5-4: Trip Circuit Supervision Scheme 1 (H5) ............................................................................46
Figure 5-5: Trip Circuit Supervision Scheme 2 (H6) ............................................................................47
Figure 5-6: Trip Circuit Supervision Scheme 3 (H7) ............................................................................47
Figure 5-7 Close Circuit Supervision Scheme .......................................................................................48
Figure 6-1: Relay Currents – External Earth Fault with In Zone Earthing Transformer .........................49
Figure 6-2: Relay Currents – External Earth Fault with In Zone Earthing Transformer .........................50
Figure 6-3 7SR24 Applied to Yd Transformer with an In Zone Earthing Transformer...........................50
Figure 6-4: 51
Figure 6-5 – AC Connections: Yd9, 900 Transformer – Non-standard Secondary
Connections .......................................................................................................................52
Figure 6-6 AC Connections: Yd9, 900 Transformer – Standard Secondary Connections .....................53
Figure 6-7 Dyn11 Transformer with Reverse Phase Notation ...............................................................54
Figure 6-8: AC Connections for Auto-Transformer Overall Protection...................................................55
Figure 6-9: AC Connections for Auto-Transformer Overall and REF Protection ...................................55
Figure 6-10 AC Connections for Reactor and Connections Protection..................................................56
List of Tables
Table 2-1 The Effect of ICT Selection on Protection Settings................................................................22
©2010 Siemens Protection Devices Limited
Chapter 7 Page 4 of 56
7SR242 Duobias Applications Guide
Section 1: Common Functions
1.1
Multiple Settings Groups
Alternate settings groups can be used to reconfigure the relay during significant changes to system conditions
e.g.
Primary plant switching in/out.
Summer/winter or day/night settings.
switchable earthing connections.
Allowable short term overloads.
Loss of Grid connection (see below)
Start
generators
Trip non-essential loads
Local
Generation
Industrial system draws power from grid
system during normal operation
Select alternate
settings group
Relays normally use settings group 1
On loss of mains:
Local generation switched in.
Non essential loads tripped
Relays on essential circuits switched to
settings group 2 to reflect new load and
fault currents
RADIAL SUBSTATION
Non-essential
loads
Figure 1-1
Example Use of Alternative Settings Groups
©2010 Siemens Protection Devices Limited
Chapter 7 Page 5 of 56
7SR242 Duobias Applications Guide
1.2
Binary Inputs
Each Binary Input (BI) can be programmed to operate one or more of the relay functions, LEDs or output relays.
These could be used to bring such digital signals as Inhibits for protection elements, the trip circuit supervision
status, autoreclose control signals etc. into the Relay.
Alarm and Tripping Inputs
A common use of binary inputs is to provide indication of alarm or fault conditions e.g. transformer Buchholz Gas
or Buchholz Surge conditions. The Binary Inputs can be mapped to LED(s), waveform storage trigger and binary
outputs.
The inputs can also be mapped as ‘General Alarms’ – this allows user defined text to be displayed on the LCD
when the BI is energised. Inputs used in this way are programmed using:
INPUT CONFIG>INPUT MATRIX>General Alarm n – Assigned to BI.
INPUT CONFIG>GENERAL ALARMS>General Alarm n – 16 character string.
Where transformer outputs require high speed tripping, such as a Buchholz Surge, these should be wired to a
binary input to provide LED indication and also have a parallel connection wired to directly trip the circuit via a
blocking diode, see fig. 1-2:
Figure 1-2 Example of Transformer Alarm and Trip Wiring
©2010 Siemens Protection Devices Limited
Chapter 7 Page 6 of 56
7SR242 Duobias Applications Guide
The Effects of Capacitance Current
The binary inputs have a low minimum operate current and may be set for instantaneous operation. Consideration
should be given to the likelihood of mal-operation due to capacitance current. Capacitance current can flow
through the BI, for example if an earth fault occurs on the dc circuits associated with the relay. The binary inputs
will be less likely to mal-operate if they:
1
Have both the positive and negative switched (double-pole switched).
2
Do not have extensive external wiring associated with them e.g. if the wiring is confined to the
relay room.
Where a binary input is both used to influence a control function (e.g. provide a tripping function) and it is
considered to be susceptible to mal-operation the external circuitry can be modified to provide immunity to such
disturbances, see fig 1.3.
AC Rejection
The default pick-up time delay of 20ms provides immunity to ac current e.g. induced from cross site wiring.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 7 of 56
7SR242 Duobias Applications Guide
Figure 1-3 – Binary Input Configurations Providing Compliance with EATS 48-4 Classes ESI 1 and ESI 2
©2010 Siemens Protection Devices Limited
Chapter 7 Page 8 of 56
7SR242 Duobias Applications Guide
1.3
Binary Outputs
Binary Outputs are mapped to output functions by means of settings. These could be used to bring out such
digital signals as trips, a general pick-up, plant control signals etc.
All Binary Outputs are trip rated
Each can be defined as Self or Hand Reset. Self-reset contacts are applicable to most protection applications.
Hand-reset contacts are used where the output must remain active until the user expressly clears it e.g. in a
control scheme where the output must remain active until some external feature has correctly processed it.
Case contacts 26 and 27 will automatically short-circuit when the relay is withdrawn from the case. This can be
used to provide an alarm that the Relay is out of service.
Notes on Self Reset Outputs
With a failed breaker condition the relay may remain operated until current flow in the primary system is
interrupted by an upstream device. The relay will then reset and attempt to interrupt trip coil current flowing
through an output contact. Where this level is above the break rating of the output contact an auxiliary relay with
heavy-duty contacts should be utilised.
1.4
LEDS
Output-function LEDs are mapped to output functions by means of settings. These could be used to display such
digital signals as trips, a general pick-up, plant control signals etc.
User Defined Function LEDs are used to indicate the status of Function Key operation. These do not relate
directly to the operation of the Function Key but rather to its consequences. So that if a Function Key is depressed
to close a Circuit-Breaker, the associated LED would show the status of the Circuit-Breaker closed Binary Input.
Each LED can be defined as Self or Hand Reset. Hand reset LEDs are used where the user is required to
expressly acknowledge the change in status e.g. critical operations such as trips or system failures. Self-reset
LEDs are used to display features which routinely change state, such as Circuit-Breaker open or close.
The status of hand reset LEDs is retained in capacitor-backed memory in the event of supply loss.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 9 of 56
7SR242 Duobias Applications Guide
Section 2: Protection Functions
This section provides guidance on the application and recommended settings of the 7SR24 protection functions.
2.1
Overall Differential Protection (87)
This section covers the transformer overall differential protections – the biased differential and high-set differential
elements. Transformer design limitations necessitate that the protection CTs are located on the line side of the
HV and LV windings, therefore the zone of differential protection covers both transformer windings.
IW1
IW2
W1
W2
The application of differential protection to transformers is complicated by:
x
The current magnitude change introduced by the transformer HV/LV turns ratio. The current ratio may also
be variable due to the presence of an On-Load-Tap-Changer (OLTC).
x
The transformer connections which may introduce a phase change between the currents flowing into each
winding of the transformer.
x
Magnetising inrush current which flows in only one winding of the transformer when energised.
Generally the procedure to calculate relay settings is carried out in the following order:
Figure 2-1 Procedure for calculating Overall Differential Protection Settings
©2010 Siemens Protection Devices Limited
Chapter 7 Page 10 of 56
7SR242 Duobias Applications Guide
2.1.1 ICT Settings for Current Magnitude Balance
Internal current multipliers are used to adjust the CT secondary currents to accommodate for any mismatch
between the winding 1 and winding 2 CT ratios.
For load or through fault conditions the output of the ICT Multiplier for each winding must be equal,
notwithstanding variations in the OLTC position. Where possible the output of each ICT Multiplier is set to 1A at
transformer full load rating when the transformer OLTC is on its mid-tap position. At mid-tap a balanced relay
should have virtually no differential currents, the bias currents will vary with the load level.
Balancing ICT Multiplier outputs (ICTOUT) to 1A at transformer rating ensures that the relay operates at the levels
indicated by its differential protection settings. However achieving balance at ICTOUT = 1 is not always possible,
here the effects on settings must be taken into account. The effect of applying ICTOUT < 1 is to de-sensitise current
dependent differential settings, applying ICTOUT > 1 makes the effected elements more sensitive. To compensate
for the resultant ICTOUT value the following settings must be multiplied by ICTOUT:
87HS Setting
87BD Initial
87BD 1st Bias Slope Limit
See examples in sections 2.1.5 and 2.1.6.
2.1.2 ICT Settings for Vector Group Correction
Internal interposing current transformers are used to correct the CT secondary current phase relationships in line
with any phase change introduced by the transformer connections.
As a general rule, the phase angle ICT Connection setting to correct the phase angle difference is applied to the
star side winding. A table showing the settings to apply for all standard transformer vector groups is included on
the following page. The table assumes that all line CTs are ‘star’ connected.
Note that the choice of interposing CT vector group will modify the effective operating levels of the protection due
to the current distribution for the various fault conditions – the effects on settings must be taken into account - see
section 2.1.5.1.
Settings examples included in section 6 cover selected non-standard connection arrangements e.g. where the
primary connections within the protected zone are crossed.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 11 of 56
7SR242 Duobias Applications Guide
Interposing CT Selection Guide
Power Transformer Vector Group
HV Interposing
CT Selection
LV Interposing CT
Selection
Yy0, YNy0, Yyn0, YNyn0, Ydy0, Yndy0, Ydyn0, Yndyn0, Dz0
Ydy0,0q
Ydy0,0q
Yd1, YNd1
Yd1,-30q
Yy0,0q
Yd1, YNd1 + Earthing Transformer
Yd1,-30q
Ydy0,0q
Yy2, YNy2, Yyn2 YNyn2, Ydy2, YNdy2, Ydyn2, Yndyn2, Dz2
Ydy2,-60q
Ydy0,0q
Yd3, YNd3
Yd3,-90q
Yy0,0q
Yd3, YNd3 + Earthing Transformer
Yd3,-90q
Ydy0,0q
Yy4, YNy4, Yyn4, YNyn4, Ydy4, YNdy4, Ydyn4, Yndyn4, Dz4
Ydy4,-120q
Ydy0,0q
Yd5, YNd5
Yd5,-150q
Yy0,0q
Yd5, YNd5 + Earthing Transformer
Yd5,-150q
Ydy0,0q
Yy6, YNy6, Yyn6, YNyn6, Ydy6, YNdy6, Ydyn6, Yndyn6, Dz6
Ydy6,180q
Ydy0,0q
Yd7, YNd7
Yd7,150q
Yy0,0q
Yd7, YNd7 + Earthing Transformer
Yd7,150q
Ydy0,0q
Yy8, YNy8, Yyn8, YNyn8, Ydy8, YNdy8, Ydyn8, Yndyn8, Dz8
Ydy8,120q
Ydy0,0q
Yd9, YNd9
Yd9,90q
Yy0,0q
Yd9, YNd9 + Earthing Transformer
Yd9,90q
Ydy0,0q
Yy10, Yny10, Yyn10, YNyn10, Ydy10, YNdy10, Ydyn10, Yndyn10,
Dz10
Ydy10,60q
Ydy0,0q
Yd11, Ynd11
Yd11,30q
Yy0,0q
Yd11, Ynd11 + Earthing Transformer
Yd11,30q
Ydy0,0q
Dy1, Dyn1
Yy0,0q
Yd11,30q
Dy1, Dyn1 + Earthing Transformer
Ydy0,0q
Yd11,30q
Dy3, Dyn3
Yy0,0q
Yd9,90q
Dy3, Dyn3 + Earthing Transformer
Ydy0,0q
Yd9,90q
Dy5, Dyn5
Yy0,0q
Yd7,150q
Dy5, Dyn5 + Earthing Transformer
Ydy0,0q
Yd7,150q
Dy7, Dyn7
Yy0,0q
Yd5,-150q
Dy7, Dyn7 + Earthing Transformer
Ydy0,0q
Yd5,-150q
Dy9, Dyn9
Yy0,0q
Yd3,-90q
Dy9, Dyn9 + Earthing Transformer
Ydy0,0q
Yd3,-90q
Dy11, Dyn11
Yy0,0q
Yd1,-30q
Dy11, Dyn11 + Earthing Transformer
Ydy0,0q
Yd1,-30q
1.
Y or y denotes an unearthed star connection on the HV or LV side of the transformer.
2.
YN or yn denotes an earthed star connection on the HV or LV side of the transformer.
3.
D or d denotes a delta connection on the HV or LV side of the transformer respectively.
4.
Z or z denotes a zigzag connection of the HV or LV side of the transformer respectively
©2010 Siemens Protection Devices Limited
Chapter 7 Page 12 of 56
7SR242 Duobias Applications Guide
2.1.3 Biased Differential (87BD) Settings
The 87BD elements provide differential protection for phase and earth faults. The limiting factors for protection
sensitivity are dictated by the need to ensure protection stability during load or through fault conditions.
Magnitude restraint bias is used to ensure the relay is stable when the transformer is carrying load current and
during the passage of external (out of zone) fault current. As the bias current increases the differential current
required for operation increases.
Harmonic bias is used to prevent relay operation during magnetising inrush current into one winding when the
transformer is first energised.
Slo
pe
IW2
IW1 IW2
2nd
Bia
s
Operate Current
IW1
D
87B
87BD Initial
Setting
ias S
st
1 B
2nd Bias
Slope Type
lope
Bias (Restraint) Current
IW1 IW2
2
1st Bias
Slope
Limit
Figure 2-2: 87BD Characteristic
87BD Initial Setting (0.1 to 2.0 x In)
This setting is selected to ensure stability in the presence of CT and relay errors when low levels of bias current
are present i.e. low load levels.
This is the minimum level of differential current at which the relay will operate. Typically this setting is chosen to
match the on load tap-change range. For example if the tap change range is +10% to –20%, a setting of 0.3In is
selected.
87BD 1st Bias Slope Setting (0.0 to 0.7)
Steady state unbalance current will appear in the differential (operate) circuit of the relay due to the transformer
tap position, relay tolerance and to CT measurement errors. The differential current will increase with increasing
load or through fault current in the transformer so, to ensure stability, the differential current required for operation
increases with increasing bias current. The bias slope expresses the current to operate the relay relative to the
biasing (restraint) current.
The Bias slope setting chosen must be greater than the maximum unbalance, it is selected to ensure stability
when through fault or heavy load current flows in the transformer and the tap changer is in its extreme position.
The recommended setting is 1 x the tap change range. As the protection is optimised around the centre tap
position then using the total tap change range includes for a 100% safety margin, this provides contingency for
CT and relay tolerances. For example if the tap change range is +10 to –20%, the overall range is 30% so a 0.3x
setting is chosen.
87BD 1st Bias Slope Limit Setting (1 to 20 x In)
Above this setting the ratio of differential current to bias current required for operation is increased.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 13 of 56
7SR242 Duobias Applications Guide
When a through fault occurs, saturation of one or more CTs may cause a transient differential current to be
detected by the relay. The bias slope limit is chosen to ensure the biased differential function is stable for high
through fault currents coincident with CT saturation. This setting defines the upper limit of the bias slope and is
expressed in multiples of nominal rated current i.e. the lower the setting the more stable the protection.
The three phase through fault current can be estimated from the transformer impedance. For a typical grid
transformer of 15% impedance, the maximum through fault will be 1/0.15 = 6.66 x rating. A setting value is
chosen that introduces the extra bias at half of the three phase through fault current level of the transformer, so
6.66/2 = 3.33 and a setting of 3 would be selected as the nearest lower setting available.
87BD 2nd Bias Slope Type (Line, Curve)
nd
87BD 2
Bias Slope Setting (1.0 to 2.0 – applied to ‘Line’ only)
These settings are chosen to ensure the biased differential function is stable for high through fault currents
coincident with CT saturation.
87BD Inrush Action
Harmonic bias is used to prevent relay operation during magnetising inrush current into one winding when the
transformer is first energised.
The recommended setting is ENABLED - see section 5.1.
87BD Overfluxing Action
This setting can be used to prevent operation of the 87BD elements in the presence of allowable over-fluxing
conditions - see section 5.2.
87BD Time Delay Setting
A 5ms setting is recommended where the circuit is cabled to ensure stability during resonant conditions.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 14 of 56
7SR242 Duobias Applications Guide
2.1.4 Differential Highset (87HS) Settings
The element operates on the differential current measured by the relay.
The 87HS element is generally applied as an unrestrained differential element to provide fast tripping for heavy
internal faults.
IW1
IW2
W1
W2
87HS
87HS Delay
Operate Current
IW1 IW2
Figure 2-3: Differential Highset Characteristic
87HS Setting (1 to 30 x In)
The 87HS element is set as low as possible but not less than the maximum three phase through fault current and
not less than half the peak magnetizing inrush current.
For almost all applications a setting of 7 or 8 x In has shown to be sufficiently sensitive for internal faults as well
as providing stability during external faults and transient system conditions.
A Differential Highset Setting of 7 x In will be stable for a peak magnetizing inrush levels of 14 x rated current.
Smaller transformers generally will have lower impedance and therefore greater three phase through fault levels
and magnetizing inrush currents. A setting of 8 x can be used as CT saturation is reduced as system X/R is
usually very low and the peak level of magnetising current does not usually ever exceed 16 x rating.
87HS Delay Setting
A 5ms setting is recommended to compensate for transient overreach.
87HS Inrush Action
87HS Overfluxing Action
These functions are set to ‘Disabled’ unless specifically required by the application.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 15 of 56
7SR242 Duobias Applications Guide
2.1.5 Example 1 – New Installation
Figure 2-4 New Transformer Application
The required AC connections to the 7SR24 are shown in fig. 2.1-5
W1/W2
Yd11 (30o)
1
A
2
W1 IL1
2
6
6
5
W1 IL2
9
10
14
IG1
5
W2 IL2
W1 IL3
13
B
1
W2 IL1
10
9
W2 IL3
18 A 17
IG2
NOTES
CTs shown wired to 1A relay inputs
REF protection shown on Star winding
Figure 2-5: AC Connections - Example 1
©2010 Siemens Protection Devices Limited
Chapter 7 Page 16 of 56
7SR242 Duobias Applications Guide
Step 1 – Selection of Line CT Ratios
CTs with a secondary rating of 1A are preferred as the burden imposed on the CT by the secondary wiring is
reduced in comparison with a 5A rated secondary.
HV load current =
LV load current =
90 u 10 6
393.7A
3 u 132,000
90 u 10 6
3 u 33,000
A CT ratio of 400/1A is chosen.
u 0.95 1495.7 A
A CT ratio of 1600/1A is chosen.
Note, the 0.95 factor relates to the tap changer at mid-tap position.
Step 2 – Selection of ICT Multiplier Settings
The outputs of the interposing CTs (ICTOUT) must be balanced for system healthy conditions - where possible the
balance is set at 1.00A at transformer rated current/mid-tap position.
HV Secondary current =
393.7
400
LV Secondary current =
1495.7
1600
0.98A
HV ICT Multiplier = 1/0.98 = 1.02
0.93A
LV ICT Multiplier = 1/0.93 = 1.07
90MVA, Z = 14%, Yd11, 132/33kV +10% to -20%
400/1
393.7A
1495.7A
1600/1
0.93A
0.98A
W1: 1A
W2: 1A
Terminals
0.93
0.98
X1.02
X1.07
ICT Multiplier
1.00
Yd11
1.00
Yy0
ICT Connection
W2
Bias
W1
Bias
W1 ICTOUT = 1.00
Operate
W2 ICTOUT = 1.00
Figure 2-6 ICT Settings – Example 1
©2010 Siemens Protection Devices Limited
Chapter 7 Page 17 of 56
7SR242 Duobias Applications Guide
Summary of Required Settings
CT/VT CONFIG >
W1 Phase Input
W1 Phase CT Ratio
W2 Phase Input
W2 Phase CT Ratio
1A
400:1
1A
1600:1
FUNCTION CONFIG>
Gn Differential
Gn Inrush Detector
Enabled
Enabled
DIFFERENTIAL PROT’N >
Gn W1 ICT Multiplier
1.02
Gn W1 ICT Connection
Yd11
Gn W2 ICT Multiplier
1.07
Gn W2 ICT Connection
Yy0
(Note that the above settings produce ICTOUT = 1.00)
DIFFERENTIAL PROT’N > 87BD >
Gn 87 BD Element
Gn 87BD Initial:
Gn 87BD 1st Bias Slope:
0.3x
Gn 87BD 1st Bias Slope Limit:
Gn 87BD 2nd Bias Slope Type:
Gn 87BD 2nd Bias Slope:
1.5x
Gn 87BD Delay:
0.005s
Gn 87BD Inrush Action:
Gn 87BD Overfluxing Action:
DIFFERENTIAL PROT’N > 87HS >
Gn 87HS Element
Gn 87HS Setting:
8 x In
Gn 87HS Delay:
0.005s
Gn 87HS Inrush Action:
Gn 87HS Overfluxing Action:
SUPERVISION > INRUSH DETECTOR >
Gn81HBL2 Element
Gn 81HBL2 Bias
Cross
Gn 81HBL2 Setting
OUTPUT CONFIG>OUTPUT MATRIX>
87BD
87HS
Enabled
0.3 x In
4 x In
Line
(0.3 x ICTOUT )
(OLTC = +10% to -20%)
(1/0.14 x 0.5 = 3.6 x ICTOUT)
(Default value)
(Default value)
Inhibit
Off
Enabled
(> I3PH THRU FAULT i.e. 1/0.14 = 7.14 x ICTOUT)
Off
Off
Enabled
0.2 x I
(Default value)
(Default value)
BOn, Ln
BOn, Ln
OUTPUT CONFIG>BINARY OUTPUT CONFIG>
CB1 Trip Contacts
BOn
CB2 Trip Contacts
BOn
©2010 Siemens Protection Devices Limited
Chapter 7 Page 18 of 56
7SR242 Duobias Applications Guide
2.1.5.1
Example 1 – Further Analysis
Having established settings to ensure stability under load, transient and external fault conditions the following
considers the operating levels for internal faults. The ‘fault setting’ for internal fault conditions is affected by the
ICT Multiplier and ICT Connection settings applied:
W1 Internal Earth Fault
Figure 2-7: Relay Currents - Star Winding Internal Earth
Notes
A- E fault causes current to flow in the A and C elements
The Yd ICT connection reduces current flow by a factor of 1/3
Relay may indicate A and C faults
©2010 Siemens Protection Devices Limited
Chapter 7 Page 19 of 56
7SR242 Duobias Applications Guide
W1 Internal Phase-Phase Fault
Figure 2-8: Relay Currents - Star Winding Internal Phase Fault
Notes
B - C fault causes current to flow in the A, B and C elements
The Yd ICT connection causes a 1:2:1 current distribution and introduces a 1/3 multiplying factor.
Relay may indicate three phase fault
©2010 Siemens Protection Devices Limited
Chapter 7 Page 20 of 56
7SR242 Duobias Applications Guide
W2 Internal Earth Fault
Figure 2-9: Relay Currents - Delta Winding Internal Earth Fault
W2 Internal Phase-Phase Fault
Figure 2-10: Relay Currents - Delta Winding Internal Phase Fault
©2010 Siemens Protection Devices Limited
Chapter 7 Page 21 of 56
7SR242 Duobias Applications Guide
Table 2-1 summarises the implications of using Yd or Yy interposing CTs.
Table 2-1 The Effect of ICT Selection on Protection Settings
CT
HV
LV
Secondary
( ICT: Yd11, x 1.02)
( ICT: Yy0, x 1.07)
Current
W1 ICTOUT =
W2 ICTOUT =
3-Phase
A = 1A
A = 1.02A
A = 1.07A
B = 1A
B = 1.02A
B = 1.07A
C = 1A
C = 1.02A
C = 1.07A
A=0
A = 0.589A
A=0
B = 1A
B = 1.178A
B = 1.07A
C = 1A
C = 0.589A
C = 1.07A
A = 1A
A = 0.589A
A = 1.07A
B=0
B=0
B=0
C=0
C = 0.589A
C=0
B–C
A–E
The above analysis covers current distributions for internal faults. The table illustrates that the Yd ICT has the
effect of:
Modifying the amplitude of the ICTOUT currents
Changing current distribution
The above factors must be considered during any analysis of protection operations and indications.
A similar analysis can be carried for external (through) fault conditions. However as the protection settings already
ensured stability for the maximum through fault condition (3-phase fault) this is not necessary.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 22 of 56
7SR242 Duobias Applications Guide
2.1.6 Example 2 – Relay Replacement Using Existing CTs
Figure 2-11 Relay Replacement
It is recommended to wire all line CTs in star when connecting to the 7SR24 relay. Where the 7SR24 is used to
replace an older biased differential relay the existing CTs will often be re-used, it is recommended that any line
CTs connected in ‘delta’ are reconnected as ‘star’.
Usually the interposing CTs associated older schemes can be removed as both the vector group and current
magnitude compensation functions are carried out within the 7SR24. This requires ICT settings to be
programmed into the relay to correct for differences before the currents are applied to the differential algorithm.
When the relay is in balance the phase angle of the currents applied to each phase of the differential algorithm
will be in anti-phase.
Figure 2-12: AC Connections - Example 2
©2010 Siemens Protection Devices Limited
Chapter 7 Page 23 of 56
7SR242 Duobias Applications Guide
Step 1 – Connection of CTs
Remove all interposing CTs from the secondary circuit. Connect all line CT secondary wiring in star.
HV load current =
LV load current =
45 u 10 6
196.8A
3 u 132,000
45 u 10 6
3 u 33,000
Re-use 300/1A CTs.
u 0.95 747.9A
Re-use 560/0.577A CTs.
Step 2 – Selection of Interposing CT Multiplier Settings
HV Secondary current =
196.8
300
LV Secondary current =
747.9
560 / 0.577
0.66A
0.77 A
HV ICT Multiplier = 1/0.66 = 1.54
LV ICT Multiplier = 1/0.77 = 1.30
Figure 2-13 Summary of ICT Settings
©2010 Siemens Protection Devices Limited
Chapter 7 Page 24 of 56
7SR242 Duobias Applications Guide
Summary of Protection Settings
CT/VT CONFIG >
W1 Phase Input
W1 Phase CT Ratio
W2 Phase Input
W2 Phase CT Ratio
1A
300:1
1A
560:0.58
FUNCTION CONFIG>
Gn Differential
Gn Inrush Detector
Enabled
Enabled
DIFFERENTIAL PROT’N >
Gn W1 ICT Multiplier
1.54
Gn W1 ICT Connection
Yy0
Gn W2 ICT Multiplier
1.30
Gn W2 ICT Connection
Yd11
(Note that the above settings produce ICTOUT = 1.00)
DIFFERENTIAL PROT’N > 87BD >
Gn 87 BD Element
Gn 87BD Initial:
Gn 87BD 1st Bias Slope:
0.2x
Gn 87BD 1st Bias Slope Limit:
Gn 87BD 2nd Bias Slope Type:
Gn 87BD 2nd Bias Slope:
1.5x
Gn 87BD Delay:
0.005s
Gn 87BD Inrush Action:
Gn 87BD Overfluxing Action:
Enabled
0.2 x In
5 x In
Line
(0.2 x ICTOUT )
(OLTC = +5% to -15%)
(1/0.1 x 0.5 = 5 x ICTOUT )
(Default value)
(Default value)
Inhibit
Off
DIFFERENTIAL PROT’N > 87HS >
Gn 87 HS Element
Enabled
Gn 87HS Setting:
10 x In
(> I3PH THRU FAULT i.e. 1/0.1 = 10 x ICTOUT)
Gn 87HS Delay:
0.005s
Gn 87HS Inrush Action:
Off
Gn 87HS Overfluxing Action:
Off
SUPERVISION > INRUSH DETECTOR >
Gn 81HBL2 Element
Gn 81HBL2 Bias
Cross
Gn 81HBL2 Setting
OUTPUT CONFIG>OUTPUT MATRIX>
87BD
87HS
Enabled
0.2 x I
(Default value)
(Default value)
BOn, Ln
BOn, Ln
OUTPUT CONFIG>BINARY OUTPUT CONFIG>
CB1 Trip Contacts
BOn
CB2 Trip Contacts
BOn
©2010 Siemens Protection Devices Limited
Chapter 7 Page 25 of 56
7SR242 Duobias Applications Guide
2.2
Instantaneous OC/EF (50/50G/50N)
Instantaneous overcurrent can be applied to protect the HV terminals against high fault currents. The current
setting applied must be above the maximum 3-phase through fault level of the transformer to ensure grading with
the LV overcurrent protection.
Where the setting applied is below the magnetising inrush current of the transformer then inrush blocking
(81HBL2) should be enabled.
2.3
Time Delayed OC/EF (51/51G/51N)
The time delayed element can provide a number of shaped characteristics. The selectable Inverse definite
minimum time lag (IDMTL) and Definite Time Lag (DTL) characteristics provide protection for phase and earth
faults.
As these protections are used as back-up protections discrete relays are often installed. To reduce cost and
complexity it may be considered acceptable to implement the backup protection using elements within the main
protection relay. The relay is self supervised and this can be used as justification for allowing the backup
protection to be included as part of the main differential protection relay.
The following elements can be included:
x
Three phase over current with IDMTL (IEC or ANSI) or DTL operate characteristic (51)
x
Derived earth fault with IDMTL (IEC or ANSI) or DTL operate characteristic (51N)
x
Measured earth fault with IDMTL (IEC or ANSI) or DTL operate characteristic (51G)
Each of the above elements can be selected to winding 1 or winding 2 CT inputs.
The time delayed characteristics are used to provide grading with other relays or fuses.
Earth fault elements can be used to provide system protection or standby earth fault protection of an earthing
resistor.
2.3.1 Selection of Over-current Characteristics
Where the relay operate time must be co-ordinated with other time delayed relays on the system, the operating
characteristic is selected to be the same type as the other relays. Often a normally inverse (NI) characteristic is
applied, however extremely inverse curves (EI) can provide improved grading with fuses or moulded case circuit
breakers.
To optimise the grading capability of the relay additional time multiplier, ‘Follower DTL’ (Fig. 2.1-1) or ‘Minimum
Operate Time’ (Fig. 2.1-2) settings can be applied.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 26 of 56
7SR242 Duobias Applications Guide
1000.00
1000.00
100.00
100.00
10.00
Operating Time (Seconds)
Operating Time (Seconds)
10.00
1.00
1.00
0.10
0.10
0.01
0.01
1
10
100
1
1000
10
100
1000
Current (x Is)
Current (x Is)
Figure 2-14 IEC NI Curve with Time Multiplier and Follower DTL Applied
1000.00
100.00
Operating Time (Seconds)
10.00
1.00
0.10
0.01
1
10
100
1000
Current (x Is)
Figure 2-15
IEC NI Curve with Minimum Operate Time Setting Applied
©2010 Siemens Protection Devices Limited
Chapter 7 Page 27 of 56
7SR242 Duobias Applications Guide
2.3.2 Reset Delay
Faults in plastic insulated cables or compound-filled joint boxes can be intermittent or ‘flashing’ faults – the
insulant melts and temporarily reseals the fault for a short time after which the insulation fails again.
The repeating process of the fault often causes electromechanical disc relays to “ratchet” up and eventually trip
the faulty circuit if the reset time of the relay was longer than the time between successive flashes.
To ensure time grading is maintained with other relays on the system a DTL or shaped (ANSI only) reset
characteristic can be selected for all overcurrent and earth fault elements.
Where the substation feeds an outgoing overhead line network, particularly where reclosers are installed,
instantaneous resetting is desirable to ensure that, on multiple shot reclosing schemes, correct grading between
the substation incomer relays and the relays associated with the reclosers is maintained.
R3
R1
R2
FAULT
Clashing
conductors or
re-sealing cable
Electro-mechanical Relay
(Instantaneous.
Reset
TRIP
TRIP
Time
DTL Reset
Time
Figure 2-16 Overcurrent Reset Characteristics
©2010 Siemens Protection Devices Limited
Chapter 7 Page 28 of 56
7SR242 Duobias Applications Guide
2.4
High Impedance Restricted Earth Fault (64H)
Restricted earth fault (REF) protection can be applied to either or both windings of the transformer. The 7SR24
provides a high impedance REF (64H) element for each transformer winding. Low leakage reactance CTs (Class
PX) are required for use with high impedance protection systems.
Figure 2-17: REF Protection Applied to a Delta/Star Transformer
The zone of REF protection is defined by the position of the CTs and/or the transformer winding. REF protection
provides a low operate current (fault setting) for in zone earth faults and stability during external faults.
REF is more sensitive than overall biased differential protection (87BD) to earth faults it can protect against faults
for a greater portion of the transformer windings or where the impedance in the earth fault path is relatively high.
For a solidly earthed star winding, the REF function is roughly twice as sensitive in detecting a winding earth fault,
than biased differential protection.
The stability of high impedance REF schemes depends upon the operate voltage setting being greater than the
voltage which can appear across the element during the maximum assigned through fault conditions. To provide
the required operating voltage an external ‘stabilising’ resistor is wired in series with the 64H current measuring
input. A non-linear resistor is connected in parallel to protect the relay circuit against high over-voltages. REF
connections are shown in fig. 2.4-2.
Dy11 (30o)
Note:
CTs shown wired
to 1A relay inputs
7SR24
1
A
2
W1 IL1
2
6
6
5
W1 IL2
9
10
Non-Linear Resistor
13
14
IG1
5
W2 IL2
W1 IL3
Stabilising Resistor
B
1
W2 IL1
10
9
W2 IL3
18 A 17
IG2
Stabilising Resistor
Non-Linear Resistor
Figure 2-18: AC Connections: REF
The operating voltage of the relay/stabilising resistor combination is calculated taking into account: the r.m.s.
value of the symmetrical component of the transformer through fault current
©2010 Siemens Protection Devices Limited
Chapter 7 Page 29 of 56
7SR242 Duobias Applications Guide
The relay current setting is calculated taking into account: the required operate level for in-zone earth faults (fault
setting).
Determination of Stability
The stability of the high impedance REF scheme depends upon the operate voltage setting being greater than the
maximum voltage which can appear across the element/stabilising resistor during the maximum assigned through
fault conditions. It is assumed that any earthing resistor can become short-circuit.
This maximum voltage that can appear across the relay circuit can be determined by a simple calculation which
makes the following assumptions:
One current transformer is fully saturated making its excitation current negligible.
The remaining current transformers maintain their ratio.
The resistance of the secondary winding of the saturated CT together with the leads connecting it to the
relay circuit terminals constitute the only burden in parallel with the relay.
The minimum required relay operate voltage setting (Vs) is given by:
(1)
VS t IMAX (RCT RL )T
Where:
IMAX = Maximum steady state through fault current of the transformer
RCT = CT secondary winding resistance
RL = Lead loop resistance between the CT and the relay circuit terminals
T = Turns ratios of the CTs
Establishing the Primary Operating Current (Fault Setting)
The required relay setting current is given by:
(2)
IS
IF
¦ Imag INLR T
Where:
IS = Relay setting current
IF = Required primary operate current (fault setting)
Imag = CT magnetising current at Vs
INLR = Current through the non-linear resistor at Vs (usually small and often may be neglected)
Equation (2) should properly be the vector sum, however arithmetic addition is normally used.
Establishing the Required Stabilising Resistor Value
The required resistance value is given by:
(2)
R
VS
IS
The exact resistance value is not necessary, a higher resistor standard value may be chosen provided that the
resultant voltage setting (Vs) is less than 0.5 x Minimum CT Knee Point Voltage.
Thermal Ratings of Relay Circuit Components
The required Watt-Second ratings of the stabilising resistor and the non-linear shunt resistor are established at
setting (continuous rating) and at the maximum fault rating (short time rating).
Resistors should be mounted vertically in a well ventilated location and clear of all other wiring and equipment to
avoid the effects of their power dissipation.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 30 of 56
7SR242 Duobias Applications Guide
2.5
Open Circuit (46BC)
Used to detect an open circuit condition e.g. an OLTC failure.
There will be little or no fault current and so differential elements will not detect the condition. However the
condition can be detected because there will be a high content of NPS (unbalance) current present.
An NPS / PPS ratio > 50% will result from an open circuit condition.
A time delay can be applied to prevent operation for transitory effects.
2.6
Negative Phase Sequence Overcurrent (46NPS)
The Negative Phase Sequence (NPS) over current is intended to be used to detect uncleared system faults and
conditions such as broken primary connections that may produce significant NPS current.
This unbalance may cause rotating plant such as generators or motors to overheat and fail.
This may also be used to monitor the state of the tap changer and alarm for faults with diverter resistors or
switches.
Typical Settings are 5 to 10% for Tap Changer alarm and 10 to 15% for system fault or broken conductor.
2.7
Undercurrent (37)
Where current decreases beneath defined levels this can indicate low load or CB open conditions, it can also be
used to indicate that no current is flowing.
The undercurrent function is used:
As a fault current check i.e. that no fault current continues to flow and that an auto-isolation sequence
may safely be initiated.
As a check that a CB has opened – this can be used in addition to or in place of CB auxiliary switch
indications.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 31 of 56
7SR242 Duobias Applications Guide
2.8
Thermal Overload (49)
Thermal protection is provided to supplement the Winding Temperature device. This function provides a general
overload thermal protection i.e. not a winding hot spot protection.
Outputs can be assigned to both alarm and trip levels. The default settings are recommended if transformer data
is not available, these settings correspond to the lowest level of thermal withstand for an oil filled transformer.
Transformer overloading can result in:x
Reduced transformer life expectancy.
x
Lower insulation voltage withstand due to degradation of the insulation.
x
Increased mechanical stress due to expansion.
x
Gas bubble production in the mineral oil at extreme levels of overload.
2.8.1 Settings Guidelines
49 Overload Setting
The 49 Overload Setting is expressed as a multiple of the relay nominal current and is equivalent to the factor
k.IB as defined in the IEC255-8 thermal operating characteristics. It is the value of current above which 100% of
thermal capacity will be reached after a period of time. This setting should be set to 110% of the secondary
current flowing when the transformer is at its full rating and on its minimum voltage tap position.
49 Time Constant Setting
A transformer may be required to temporarily run overloaded e.g. 150% of rating for two hours or 200% of rating
for one hour.
The thermal time constants required to match these specifications are:
150% for two hours
Time constant = 178 minutes
200% for one hour
Time constant = 186 minutes
These times are applicable to an overload occurring from no load with the transformer at ambient temperature.
The actual tripping time will depend on the loading level prior to the overload occurring.
The operate time can be calculated from:
Time to trip
t(mins)
ª I2
º
u ln« 2
2 »
¬I (I) ¼
The steady state % thermal capacity used can be calculated from:
% thermal capacity used
ª I2 º
« 2 » u 100
¬ (I) ¼
Where:
I
= applied current in terms of x In
I
= thermal pick-up setting x In
©2010 Siemens Protection Devices Limited
Chapter 7 Page 32 of 56
7SR242 Duobias Applications Guide
49 Capacity Alarm Setting
This setting can be used to provide an alarm prior to a thermal trip occurring and is typically set to about 80 to 90
% of thermal capacity. The thermal capacity alarm can be mapped to a binary output wired to the control system.
Example
Figure 2-19 Thermal Overload Settings
1.
In fig. 2-19 the direction of power flow is HV to LV. If W1 input is connected to HV CTs (as is usual) then
set 49 Select = W1. The transformer loss current and harmonic currents are then included in the thermal
calculation.
2.
FUNCTION CONFIG>Gn Thermal: Enabled
CURRENT PROT’N>THERMAL>Gn49 Thermal Overload: Enabled.
3.
CURRENT PROT’N>THERMAL>49 Overload Setting:
Maximum Primary Full Load current =
45000
3 u 132 u 0.85
231.5 A
Secondary Current = 231.5A/300 = 0.772A. The thermal function should not trip for currents below this
value.
A setting of 110% is used to include a margin of safety.
Therefore 49 Overload Setting = 0.85 x In (I) (1.10 x 0.772)
4.
The time constant to apply will depend upon the transformer overload specification, but in this case it
was decided to set a time constant of 178 minutes. This will allow an overload of 150% from ambient for
about two hours before a trip is issued.
5.
The capacity alarm is a useful function and therefore it is set to 90%. The current required to reach this
90% figure should be calculated. It is important not to alarm for current within the normal loading range of
the transformer.
The steady state thermal capacity = I2 / I2 x 100%
For this example: 90% = I2 / I2 x 100%. I = 0.806 x In and this level is above the maximum full load
current of 0.772 x In.
The above provides guidelines only as setting philosophies differ. Alternative protection setting groups may be
used to match transformer loading for temporary or emergency overloads, wide variations in winter/summer
loading or if a cooling failure (pump or fan) occurs. The thermal settings applied will differ in each Setting Group
and will be made appropriate to the specific load conditions.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 33 of 56
7SR242 Duobias Applications Guide
2.9
Under/Over Voltage (27/59)
Power system under-voltages may occur due to:
System faults.
An increase in system loading,
Non-energized power system e.g. loss of an incoming transformer
During normal system operating conditions regulating equipment such as transformer On Load Tap Changers
(OLTC) and generator Automatic Voltage Regulators (AVR) ensure that the system runs within acceptable
voltage limits.
7SR24 undervoltage/DTL elements can be used to detect abnormal undervoltage conditions due to system
overloads. Binary outputs can be used to trip non-essential loads - returning the system back to its normal
operating levels. This ‘load shedding’ should be initiated via time delay elements so avoiding operation during
transient disturbances. An under voltage scheme (or a combined under frequency/under voltage scheme) can
provide faster tripping of non-essential loads than under-frequency load shedding so minimising the possibility of
system instability.
Where a transformer is supplying 3-phase motors a significant voltage drop e.g. to below 80% may cause the
motors to stall. An undervoltage element can be set to trip motor circuits when the voltage falls below a preset
value so that on restoration of supply an overload is not caused by the simultaneous starting of all the motors. A
time delay is required to ensure voltage dips due to remote system faults do not result in an unnecessary
disconnection of motors.
To confirm presence/loss of supply, the voltage elements should be set to values safely above/below that where a
normal system voltage excursion can be expected. The switchgear/plant design should be considered. The ‘Dead’
level may be very near to the ‘live’ level or may be significantly below it. The variable hysteresis setting allows the
relay to be used with all types of switchgear.
System over-voltages can damage component insulation. Excessive voltage may occur for:
Sudden loss of load
A tap changer run-away condition occurs in the high voltage direction,
Generator AVR equipment malfunctions or
Reactive compensation control malfunctions.
System regulating equipment such as transformer tap changers and generator AVRs may correct the overvoltage
– unless this equipment mal-functions. The 7SR24 overvoltage/DTL elements can be used to protect against
damage caused by system overvoltages.
If the overvoltage condition is small a relatively long DTL time delay can be used. If the overvoltage is more
severe then another element, set at a higher pickup level and with a shorter DTL can be used to isolate the circuit
more quickly. Alternatively, elements can be set to provide alarm and tripping stages, with the alarm levels set
lower than the tripping stages.
The use of DTL settings allows a grading system to be applied to co-ordinate the network design, the regulating
plant design, system plant insulation withstand and with other overvoltage relays elsewhere on the system. The
DTL also prevents operation during transient disturbances.
The use of IDMTL protection is not recommended because of the difficulty of choosing settings to ensure correct
co-ordination and security of supply.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 34 of 56
7SR242 Duobias Applications Guide
2.10
Neutral Overvoltage (59N)
Neutral Overvoltage Displacement (Residual Overvoltage) protection is used to detect an earth fault where little or
no earth current flows.
This can occur where a transformer feeder has been tripped at its HV side for an earth fault, but the circuit is still
energised from the LV side via an unearthed transformer winding. Insufficient earth current would be present to
cause a trip, but residual voltage would increase significantly; reaching up to 3-times the normal phase-earth
voltage level.
If Neutral Overvoltage protection is used, it must be suitably time graded with other protections in order to prevent
unwanted tripping for external system earth faults.
EHV/HV
HV/MV
Transformer Feeder
HV CB
OC/EF
HV CB
Tripped
by local
protection
MV CB
Earth
fault
NVD
MV CB tripped by:
1) Feeder unit protection or
2) Intertrip from HV feeder protection or
3) NVD protection
Figure 2-20 NVD Application
Typically NVD protection measures the residual voltage (3V0) directly from an open delta VT or from capacitor
cones – see fig. 2.13-2 below.
Figure 2-21 NVD Protection Connections
©2010 Siemens Protection Devices Limited
Chapter 7 Page 35 of 56
7SR242 Duobias Applications Guide
2.10.1 Application with Capacitor Cone Units
Capacitor cones provide a cost effective method of deriving residual voltage. The wide range of capacitor cone
component values used by different manufacturers means that the relay cannot be connected directly to the
cones.
The external adaptor unit contains parallel switched capacitors that enable a wide range of values to be selected
using a DIL switch and hence the Capacitor Cone output can be scaled to the standard relay input range.
2.10.2 Derived NVD Voltage
Alternatively NVD voltage can be derived from the three phase to neutral voltages, this setting is available within
the relay. Note with this method the NVD protection may mal-operate during a VT Fail condition.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 36 of 56
7SR242 Duobias Applications Guide
2.11
Under/Over Frequency (81)
During normal system operation the frequency will continuously vary over a relatively small range due to the
changing generation/load balance. Excessive frequency variation may occur for:
Loss of generating capacity, or loss of mains supply (underfrequency): If the governors and other
regulating equipment cannot respond to correct the balance, a sustained underfrequency condition may
lead to a system collapse.
Loss of load – excess generation (overfrequency): The generator speeds will increase causing a
proportional frequency rise. This may be unacceptable to industrial loads, for example, where the
running speeds of synchronous motors will be affected.
In the situation where the system frequency is falling rapidly it is common practise to disconnect non-essential
loads until the generation-load balance can be restored. Usually, automatic load shedding, based on
underfrequency is implemented. Underfrequency relays are usually installed on the transformer incomers of
distribution or industrial substations as this provides a convenient position from which to monitor the busbar
frequency. Loads are disconnected (shed) from the busbar in stages until the frequency stabilises and returns to
an acceptable level.
The 7SR24 has six under/over frequency elements.
An example scheme may have the first load shedding stage set just below the nominal frequency, e.g. between
49.0 - 49.5Hz. A time delay element would be associated with this to allow for transient dips in frequency and to
provide a time for the system regulating equipment to respond. If the first load shedding stage disconnects
sufficient plant the frequency will stabilise and perhaps return to nominal. If, however, this is not sufficient then a
second load shedding stage, set at a lower frequency, will shed further loads until the overload is relieved. This
process will continue until all stages have operated. In the event of the load shedding being unsuccessful, a final
stage of underfrequency protection should be provided to totally isolate all loads before plant is damaged, e.g.
due to overfluxing.
An alternative type of load shedding scheme would be to set all underfrequency stages to about the same
frequency setting but to have different length time delays set on each stage. If after the first stage is shed the
frequency doesn’t recover then subsequent stages will shed after longer time delays have elapsed.
Network
Incomer
STAGE 1: Least important
STAGE 2
STAGE 3
STAGE 4
Generator
G59
300/5
STAGE 5
STAGE 6
5
1
2
6
5
3
4
2
4
Essential
Load
Figure 2-22 Load Shedding Scheme Using Under-Frequency Elements
©2010 Siemens Protection Devices Limited
Chapter 7 Page 37 of 56
7SR242 Duobias Applications Guide
2.12
Over Fluxing Protection (24)
An underfrequency condition at nominal voltage can cause over-fluxing (or over-excitation) of the transformer.
Excess flux can cause transformer core saturation and some of the flux will radiate as leakage flux through the
2
transformer tank. This leakage flux causes eddy currents and the I R losses from these currents heat the
transformer tank and can cause overheating.
Overfluxing protection is applied to generator step-up transformers and other plant which may be subject to this
condition.
This function measures the ratio of voltage to frequency (V/f) applied the transformer to determine operation.
The relay has two types of V/f characteristics:
x
User Definable Inverse curve
x
Two Independent Definite Time Lag elements(DTL)
User Definable V/f Curve
As the leakage flux will cause overheating, an inverse type curve provides an appropriate match to the over
fluxing withstand characteristics of a transformer.
The relay includes a user definable curve. Where the transformer manufacturer has provided an over-fluxing
withstand curve the user can define up to seven points to provide correlation between the relay characteristic and
transformer withstand curves.
Y0
X0, Y0 point
defines
curve pick-up
X
X
Straight-line
between points
X
X
X6, Y6 point
defines
curve cut-off
X
X
Y6
X0
X
X6
X - (V/f)
Two Stage DTL Over fluxing
In addition to the inverse curve, two independent DTL V/f elements are included and are used where the over
excitation withstand curve of the transformer is not known. In this case the inverse V/f curve should be set to
[Disabled] and both DTL elements should be set to [Enabled]. The default DTL settings are adequate to protect
almost all transformer designs, and can be used with confidence.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 38 of 56
7SR242 Duobias Applications Guide
Section 3: CT Requirements
The specification of CTs must meet the requirements of all protection functions utilised e.g. overall differential,
REF and backup over current protections.
The relay has 1A and 5A rated terminals for each CT input and any combination of these may be used. 1A rated
CTs can be used on one winding and together with 5A rated CTs on the other.
3.1
CT Requirement for Differential Protection
The quality of CTs will affect the performance of the protection system. The CT knee-point voltage (Vk) is a factor
in assessing protection performance.
If a high level internal short circuit occurs the dc offset in the primary fault current may produce transient CT
saturation. This is more likely to occur if the CT knee-point is low and/or the connected burden is high. Saturated
CTs produce high levels of even harmonics which may increase the operate time of the biased differential
function where harmonic restraint or inhibit is applied.
A highset differential element (87HS) can be used without harmonic restraint this can reduce the overall operating
time of the differential protection.
Restricted Earth Fault protection helps ensure fast tripping as its speed of operation is not affected significantly by
CT saturation.
For high speed operation:
Vk 4 x IFS x (A + C)
Where:
Vk = CT knee point voltage.
IFS = Max. secondary 3-phase through fault current (as limited by the transformer impedance).
A = Secondary winding resistance of each star connected CT.
C = The CT secondary loop lead resistance.
Where the CTs used have a lower knee point voltage e.g. half that calculated in the expression above the biased
differential elements may have a slightly longer operate time. To ensure stability during through fault conditions
the biased differential settings should be increased by 10%.
Advice on CT Selection.
1A rated CT secondaries are preferred to 5A CTs as the CT VA burden is reduced by a factor of 25.
Line current transformer ratios should be selected to match the main transformer rating and ratio. However the
ICT Multiplier adjustment can be used to compensate for non matched ratios. Choose a CT ratio that produces
at least 0.33 x nominal secondary rating, when based on the transformer is at nameplate rating i.e. within the
range of the ICT Multiplier setting.
Where long secondary lead lengths are required measures can be taken to reduce the burden imposed on the
CTs:
Use high CT ratios to reduce the secondary current. Compensate the low secondary current using the
ICT Multipliers..
Parallel CT secondary cable cores to reduce lead resistance.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 39 of 56
7SR242 Duobias Applications Guide
Worked Example
Figure 3-1 CT Requirements
Suitability of HV Current Transformers:
VK t 4 u
90 u 10 6
3 u 132 u 10 3 u 400 u 0.14
u 3.5 1 126.5V
i.e. less than 250V
Suitability of LV Current Transformers:
VK t 4 u
90 u 10 6
3 u 33 u 10 3 u1600 u 0.14
u 12 4 449.9V
i.e. less than 750V
An indication of the suitability of a protection class CT e.g. class 5P to IEC60044 classification can be obtained.
The product of its rated burden expressed in ohms and the secondary current equivalent of its accuracy limit
primary current will give an approximation of the secondary voltage it can produce while operating within the limit
of its stated composite error.
3.2
CT Requirements for High Impedance Restricted Earth
Fault (64H)
For high impedance REF protection:
Low reactance CTs to IEC Class PX must be used, this allows a sensitive current setting to be applied.
All current transformers should have an equal turns ratio.
The knee-point voltage of the CTs must be greater than 2 x 64H Setting Voltage (Vs) – see section 2.4.
A full explanation of how to specify CTs for use with REF protection, and set REF relays is available on our
Website: www.siemens.com/energy .
©2010 Siemens Protection Devices Limited
Chapter 7 Page 40 of 56
7SR242 Duobias Applications Guide
Section 4: Control Functions
4.1
User Defined Logic
4.1.1 Auto-Changeover Scheme Example
Figure 4-1 Example Use of Quick Logic
The MV installation illustrated above is fed from two incomers. To limit the substation fault level the busbar is run
with CB3 open. When a fault occurs on one of the incomers it is isolated by the circuit protection. To re-supply the
disconnected loads from the remaining incomer CB3 is closed.
If the line fault occurs on incomer 1 it must be confirmed that CB 1 has opened before CB3 can be closed. The
relay on incomer 1 confirms that a trip has been issued to CB1 (e.g. Binary Output 2), that CB 1 has opened (e.g.
Binary Input 1) and that no current flows in the circuit (e.g. 37-1 = Virtual 1):
Incomer 1 Relay is Configured:
CB1 Open auxiliary switch wired to B.I. 1
Trip output to CB1 = B.O. 2
OUTPUT CONFIG>OUTPUT MATRIX: 37-1 = V1
OUTPUT CONFIG>OUTPUT MATRIX: E1 = BO3
CONTROL & LOGIC>QUICK LOGIC: E1 = O2.I1.V1
The output from Incomer 1 (BO3) relay is input to the relay on CB 3 (Binary Input 1). A panel switch may be used
to enable the On-Load Change-over scheme (Binary Input 2). Before Closing CB3 a check may be made that
there is no voltage on busbar 1 (27/59-1 = Virtual 1). CB 3 is closed from Binary Output 3.
CB3 Relay is Configured:
Panel switch (ON-Load Change-over Enabled) wired to B.I. 1
OUTPUT CONFIG>OUTPUT MATRIX: 27/59-1 = V1
OUTPUT CONFIG>OUTPUT MATRIX: E1 = BO3
CONTROL & LOGIC>QUICK LOGIC: E1 = I1.I2.V1
If required a time delay can be added to the output using the CONTROL & LOGIC > QUICK LOGIC: E1
Pickup Delay setting.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 41 of 56
7SR242 Duobias Applications Guide
Section 5: Supervision Functions
5.1
Inrush Detector (81HBL2)
87 Inrush Element (Enable, Disable)
When a transformer is energized transient magnetizing inrush currents flow in each phase of the energised
winding. Inrush currents only flow into one transformer winding and the resulting unbalance can be sufficient to
cause mal-operation of the biased differential elements. To prevent the relay operating for this non-fault condition,
the presence of even harmonics in the current is used to distinguish between inrush currents and short circuit
faults.
The inrush restraint detector can be used to block the operation of selected elements during transformer
magnetising inrush conditions.
The 81HBL2 Bias setting allows the user to select between, Phase, Sum and Cross methods of measurement.
Each of the three selections has a specific application.
Phase – The even harmonic content in each phase is measured independently and compared to the total operate
current in its own phase i.e. each phase of the biased differential elements is blocked by even harmonic content in
its own phase only.
This method is used exclusively where large transformers are manufactured with three separate phase tanks
each containing a phase core. This construction facilitates transportation. Each of the phase cores is not
magnetically affected by the flux in the other phase cores.
These large single phase transformers are often auto-transformers used on EHV transmission systems. A typical
setting level for this application is 18% of Id.
Cross – Each phase is monitored and if the even harmonic present in any phase exceeds the setting then all
three phases are blocked. This method is used for the majority of applications of the relay to power transformers.
Generally the default setting of 0.20 x Id provides stable operation.
Sum – The level of even harmonic current (2nd and 4th) in the differential signal for each phase is measured. The
square root is taken of each of these even harmonic currents and these three values summated. This single
current level is then divided by the Inrush Setting to arrive at the Harmonic Sum with which each of the phase
currents are compared.
If the operate current in any phase is greater than this Harmonic Sum then its differential element will operate.
The advantage of this method is it allows fast operation of the biased differential element if the transformer is
switched onto an internal phase to earth fault. The cross method may suffer from slowed operation for this
situation, as healthy phase inrush may block all three phases (including the one feeding the fault current) from
operating. Where REF is used to protect the winding, the slowed operation is not critical as the REF will operate
very fast, typically in about 20ms for this rare condition.
The Sum method is not slowed down when switching onto an in zone earth fault, as the Harmonic Sum is reduced
by the presence of the fault current and therefore allows relay operation.
Typically the Sum method will allow the biased differential elements to operate in the normal time of about 30ms,
if a transformer earth fault occurs when it is energised.
This setting is recommended if REF is not used to protect the windings for earth faults on effectively earthed
power systems. The recommended setting that offers a good compromise between stability for typical inrush
currents and fast operation for internal faults is 0.15 x Id.
87 Inrush Setting (0.1 to 0.5 x Id)
This defines the levels of inrush used in each of the above methods.
The setting applied will determine the level of even harmonic (second and fourth) content in the relay operating
current that will cause operation of the relay to be inhibited. The lowest setting of 0.1 x Id therefore represents the
setting that provides the most stability under magnetising inrush conditions.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 42 of 56
7SR242 Duobias Applications Guide
The recommended settings for each method are:
Phase – 0.18 x Id
Cross – 0.20 x Id
Sum – 0.15 x Id
These setting provide a good compromise between speed of operation for internal faults and stability for inrush
current. Generally the above values will be stable for most cases, but in rare cases may not prevent relay
operation for all angles of point on wave switching, and the setting may require being lower slightly. If the relay
operates when the transformer is energised, the waveform record should be examined for signs of fault current
and the levels of harmonic current.
Set to 0.20 x Id unless a very rare false operation for inrush occurs. In which case a lower setting should be
adopted after checking the waveform record for the presence of fault current.
5.2
Overfluxing Detector (81HBL5)
An increase in transformer or decrease in system frequency may result in the transformer becoming over-excited.
The 81HBL5 element can be used to prevent protection operation e.g. prevent differential protection operation
during acceptable over-excitation conditions.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 43 of 56
7SR242 Duobias Applications Guide
5.3
Circuit Breaker Fail (50BF)
Where a circuit breaker fails to operate to clear fault current the power system will remain in a hazardous state
until the fault is cleared by remote or back-up protections. To minimise any delay, CB Failure protection provides
a signal to either re-trip the local CB or back-trip the next ‘upstream’ CB.
Figure 5-1 - Circuit Breaker Fail
The CBF function is initiated by the operation of either:
Protection functions that operate binary outputs mapped as OUTPUT CONFIG>BINARY OUTPUT
CONFIG>CBn Trip Contacts, or
A binary input mapped as INPUT CONFIG>INPUT MATRIX >C50BF-n Ext Trip
Each 50BF uses phase segregated current check elements and two timers.
Current in each phase is monitored and if any of the 50BF current check elements have not reset before the
timers have expired an output is given. Typically a single stage scheme is used, DTL1 is wired to back-trip the
adjacent CBs e.g. via the busbar protection system. Alternatively the first timer output can be wired to re-trip the
failed CB through a different trip coil, and the second timer output is wired to trip the adjacent CBs.
Practical time sequences for single and two stage 50BF applications are illustrated below.
Relay
Operation
and CBF
Timer
Started
System
Fault
Main
Trip
Relay
Operation
20
40
Backtrip
Trip Relay
Reset of
CBF elements
does not occur
Backtrip
Operation
Failure of
CB to trip
60
80
CB Backtrip
Sucessful
100
120
140
160
180
200
220
240
260
280
300
320
340
ms from fault
occuring
CB Operate Time
Stage 1 CBF Timer (Backtrip) = 120ms
Figure 5-2 - Single Stage Circuit Breaker Fail Timing
©2010 Siemens Protection Devices Limited
Chapter 7 Page 44 of 56
7SR242 Duobias Applications Guide
Relay
Operation
and CBF
Timer
Started
System
Fault
Backtrip
Trip Relay
Operation
CBF Retrip
Trip Relay
Main
Trip
Relay
Operation
40
CB's
Fails to
Trip
60
80
No Reset of
CBF elements
No Reset of
CBF elements
CBF Retrip
Operation
Reset of
CBF elements
CBF Back trip
Operation
Failed CB Retrip
Operation
100
120
140
Operation of all
BB CB's
160
180
200
220
240
260
280
300
320
340
360
ms from
occuri
CB Operate Time
Stage 1 CBF Timer (Retrip) = 120ms
Stage 2 CBF Timer (Backtrip) = 250ms
Figure 5-3 - Two Stage Circuit Breaker Fail Timing
Example of Required Settings (e.g. HV CB)
FUNCTION CONFIG>
Gn CB Fail
Enabled
SUPERVISION > CB FAIL > 50BF-1
Gn 50BF-1 Element
Gn 50BF-1 Setting
Gn 50BF-1-1 Delay
Gn 50BF-1-2 Delay
Enabled
0.2 x In
120ms
250ms
INPUT CONFIG>INPUT MATRIX>
50BF-1 Ext Trip
BIn
OUTPUT CONFIG>OUTPUT MATRIX>
50BF-1-1
50BF-1-2
BOn, Ln
BOn, Ln
OUTPUT CONFIG>BINARY OUTPUT CONFIG>
CB1 Trip Contacts
BOn
The above based on:
First Stage Backtrip (or Re-trip)
Typical Times
Trip Relay operate time
10ms
CB Tripping time
50ms
DUOBIAS-M Reset Time
30ms
Safety Margin
30ms
Overall First Stage CBF Time Delay 120ms
Second Stage (Back Trip)
First CBF Time Delay
Trip Relay operate time
DUOBIAS-M Reset Time
30ms
CB Tripping time
50ms
Margin
Overall Second Stage CBF Time Delay
©2010 Siemens Protection Devices Limited
120ms
10ms
50ms
260ms
Chapter 7 Page 45 of 56
7SR242 Duobias Applications Guide
5.4
Trip Circuit Supervision (74TCS)
Binary Inputs may be used to monitor the integrity of the CB trip circuit wiring. Current flows through the B.I.
confirming the integrity of the auxiliary supply, CB trip coil, auxiliary switch, C.B. secondary isolating contacts and
associated wiring connected to that BI. If the current flow ceases, the B.I. drops off and if it is user programmed to
operate one of the output relays, this can be used to provide an alarm. In addition, an LED on the relay fascia can
be programmed to operate. A user text label can be used to define the operated LED e.g. “Trip CCT Fail”.
The relevant Binary Input is mapped to 74TCS-n in the INPUT CONFIG>INPUT MATRIX menu. To avoid giving
spurious alarm messages while the circuit breaker is operating the input is given a 0.4s Drop-off Delay in the
INPUT CONFIG>BINARY INPUT CONFIG menu.
To provide an alarm output a normally open binary output is mapped to 74TCS-n.
5.4.1 Trip Circuit Supervision Connections
The following circuits are derived from UK ENA S15 standard schemes H5, H6 and H7.
For compliance with this standard:
Where more than one device is used to trip the CB then connections should be looped between the
tripping contacts. To ensure that all wiring is monitored the binary input must be at the end of the looped
wiring.
Resistors must be continuously rated and where possible should be of wire-wound construction.
Scheme 1 (Basic)
Figure 5-4:
Trip Circuit Supervision Scheme 1 (H5)
Scheme 1 provides full Trip and Close supervision with the circuit breaker Open or Closed.
Where a ‘Hand Reset’ Trip contact is used measures must be taken to inhibit alarm indications after a CB trip.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 46 of 56
7SR242 Duobias Applications Guide
Scheme 2 (Intermediate)
BO
+
52a
TRIP COIL
-
TRIP CCT n FAIL
52a
Circuit
Breaker
BI
R
+ve
-ve
52b
BO 1
BO n
Remote
Alarm
Figure 5-5:
H6 Scheme Notes:
Resistor:
30V dc Nominal:
48V dc Nominal:
110V dc Nominal:
R = 3K9
R = 5K6
R = 15K0
Trip Circuit Supervision Scheme 2 (H6)
Scheme 2 provides continuous Trip Circuit Supervision of trip coil with the circuit breaker Open or Closed. It does
not provide pre-closing supervision of the connections and links between the tripping contacts and the circuit
breaker and may not therefore be suitable for some circuits which include an isolating link.
1
Scheme 3 (Comprehensive)
Figure 5-6:
Trip Circuit Supervision Scheme 3 (H7)
Scheme 3 provides full Trip and Close supervision with the circuit breaker Open or Closed.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 47 of 56
7SR242 Duobias Applications Guide
5.4.2 Close Circuit Supervision Connections
BO
+
52a
CLOSE
COIL
-
CLOSE CCT n FAIL
R
BI
+ve
Circuit
Breaker
R
-ve
52b
BO 1
BO n
Remote
Alarm
Resistor:
30V dc Nominal:
48V dc Nominal:
110V dc Nominal:
R = 3K9
R = 5K6
R = 15K0
Figure 5-7 Close Circuit Supervision Scheme
Close circuit supervision with the circuit breaker Open or Closed.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 48 of 56
7SR242 Duobias Applications Guide
Section 6: Application Considerations and Examples
6.1
The Effects of An In Zone Earthing Transformer
Yy0 (0o)
Yd11 (30o)
The in zone earthing transformer is a source of zero-sequence fault current. An earth fault on the delta side of the
transformer external to the differential protection zone will cause zero sequence currents to flow in the CTs on the
delta side of the transformer without corresponding current to flow in the line CTs on the star side of the
transformer. If these zero sequence currents are allowed to flow through the differential elements they may cause
undesired tripping.
Figure 6-1: Relay Currents – External Earth Fault with In Zone Earthing Transformer
To prevent undesired tripping the ICT connections should be such as to cause the zero sequence currents to flow
in a closed delta CT secondary connection of low impedance instead of in the differential relay operating coil. As
we have already corrected for the transformer vector group on the star side a Ydy0 ICT is used on the delta side
winding.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 49 of 56
7SR242 Duobias Applications Guide
Figure 6-2: Relay Currents – External Earth Fault with In Zone Earthing Transformer
Figure 6-3 7SR24 Applied to Yd Transformer with an In Zone Earthing Transformer
©2010 Siemens Protection Devices Limited
Chapter 7 Page 50 of 56
7SR242 Duobias Applications Guide
6.2
Protection of Star/Star Transformer With Tertiary
Winding
Figure 6-4:
The provision of the tertiary winding in star/star transformers both stabilises the neutral potential and can allow
earth fault current to flow in the secondary connections i.e. reduces the zero sequence impedance. An earth fault
on the LV side of the transformer external to the differential protection zone will cause zero sequence currents to
flow in the CTs on the LV side without corresponding current to flow in the line CTs on the HV side. If these zero
sequence currents are allowed to flow through the differential elements they may cause undesired tripping.
The transformer has a phase shift of zero. To prevent undesired tripping for external faults a zero sequence shunt
is required, this is implemented by selecting star/delta interposing CT settings. The Interposing CT Connection
setting on all sets of current inputs must be set to the same Yd setting e.g. all Yd1, -30° or all Yd11, 30°.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 51 of 56
7SR242 Duobias Applications Guide
6.3
Transformer with Primary Connections Crossed on Both
Windings
Yd11 Transformer Connected as Yd9 (900)
The phase-shift between the W1 and W2 primary systems may necessitate that primary connections to each
winding of the transformer have to be crossed. Fig. 6.4-1 shows a typical arrangement where a Yd11 transformer
is arranged to give a primary system phase-shift of 90q by crossing of its main connections. There are two
optional methods of configuring the 7SR24 relay.
Solution 1
Fig. 6.4-1 shows W1 and W2 CT secondary wiring crossed over to replicating the crossovers on the transformer
primary connections:
A
C
b
A-N = b-c
B-N = c-a
C-N = a-b
B
a
c
W1/W2
Yd11 (30o)
A
B
C
a
b
c
1
A
2
W1 IL1
2
6
6
5
W1 IL2
9
5
W2 IL2
10
W1 IL3
13
B
1
W2 IL1
14
IG1
ICT1 = Yd11
10
9
W2 IL3
18 A 17
IG2
ICT2 = Ydy0
NOTES
CTs shown wired
to 1A relay inputs
0
Figure 6-5 – AC Connections: Yd9, 90 Transformer – Non-standard Secondary Connections
Notes:
An advantage of the above is that the 7SR24 relay can be set to correspond to the vector group shown on the
main transformer rating plate i.e. Yd11, +30° simplifying installation. This approach is also applicable where the
transformer is used to reverse the system phase sequence – see section 6.5.
A disadvantage is that ‘non-standard’ secondary wiring connections are used.
Relay instruments will indicate ’transformer’ quantities rather than system quantities.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 52 of 56
7SR242 Duobias Applications Guide
Solution 2
Figure 6.4-2 shows use of the ICT Connection settings to correct for the phase shift introduced by the transformer
connection i.e. ICT1 Connection is set to to Yd9, -90° and ICT2 Connection is set to Ydy0, 0°.
A
C
b
A-N = b-c
B-N = c-a
C-N = a-b
B
a
c
W1/W2
Yd11 (30o)
A
B
C
a
b
c
1
A
2
W1 IL1
2
6
6
5
W1 IL2
9
5
W2 IL2
10
W1 IL3
13
B
1
W2 IL1
14
IG1
ICT1 = Yd9
10
9
W2 IL3
18 A 17
IG2
ICT2 = Ydy0
NOTES
CTs shown wired
to 1A relay inputs
Figure 6-6 AC Connections: Yd9, 900 Transformer – Standard Secondary Connections
Notes:
An advantage of the approach above is that ‘standard’ secondary wiring connections are used.
The 7SR24 relay setting correspond to the power system vector relationship i.e. Yd9, 90°.
Relay instruments will indicate ’system’ quantities rather than transformer quantities.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 53 of 56
7SR242 Duobias Applications Guide
6.4
Transformer with Primary Connections Crossed on One
Winding
Reversing the connections on only one side of the transformer will reverse the phase sequence of the system. For
this arrangement W1 and W2 CT secondary wiring must be crossed over to replicate the crossovers on the
transformer primary connections – see fig. 6.5-1.
Figure 6-7 Dyn11 Transformer with Reverse Phase Notation
Notes:
The 7SR24 relay is set to correspond to the vector group shown on the main transformer rating plate i.e. Dy11,
+30°.
Relay instruments will indicate ’transformer’ quantities rather than system quantities.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 54 of 56
7SR242 Duobias Applications Guide
6.5
Protection of Auto Transformers
The transformer has a phase shift of zero. To prevent undesired tripping of the overall differential protection for
external faults a zero sequence shunt is required, this is implemented by selecting star/delta ICT Connection
settings. The ICT Connection setting on all both sets of CT inputs must be the same e.g. all Yd1, -30° or all
Yd11, 30°. The inrush inhibit (81HBL2) must be Enabled as the magnetising inrush currents in each phase will not
balance.
Figure 6-8: AC Connections for Auto-Transformer Overall Protection
REF protection can be applied if a neutral CT is available and all CTs have the same ratio:
Figure 6-9: AC Connections for Auto-Transformer Overall and REF Protection
©2010 Siemens Protection Devices Limited
Chapter 7 Page 55 of 56
7SR242 Duobias Applications Guide
6.6
Reactor and Connections Protection
1
A
2
W1 IL1
2
6
6
5
W1 IL2
9
5
W2 IL2
10
W1 IL3
13
B
1
W2 IL1
14
IG1
ICT1 = Yy0
10
9
W2 IL3
18 A 17
IG2
ICT2 = Yy0
Figure 6-10 AC Connections for Reactor and Connections Protection
Settings must take into consideration:
Connections: High internal and through fault currents.
Series reactor: Through fault current limited by reactor.
Shunt reactor: Single end fed faults only.
©2010 Siemens Protection Devices Limited
Chapter 7 Page 56 of 56
5
Siemens Protection Devices Limited
P.O. Box 8
North Farm Road
Hebburn
Tyne & Wear
NE31 1TZ
United Kingdom
Phone: +44 (0)191 401 7901
Fax:
+44 (0)191 401 5575
Web: www.siemens.com/energy
PTD 24h Customer Support
Phone: +49 180 524 7000
Fax:
+49 180 524 2471
E-mail: support.energy@siemens.com
Data is subject to change without notification.
www. siemens.com/energy
Siemens Protection Devices Limited
2