0Sepam series 20 Merlin Gerin

0Sepam series 20 Merlin Gerin
0
0
0
0
0
User
Manual
2003
Electrical network protection
Sepam series 20 Merlin Gerin
YFJYVIIVGIT
6FKQHLGHU(OHFWULF
)55(9$
Contents
Sepam series 20
1
Metering functions
2
Protection functions
3
Control and monitoring functions
4
Modbus communication
5
Installation
6
Use
7
1
2
Sepam series 20
Contents
Présentation
1/2
Selection table
1/3
Electrical characteristics
1/4
Environmental characteristics
1/5
1/1
1
Sepam series 20
MT10357
The Sepam series 20 family of protection and metering units is designed for the
operation of machines and electrical distribution networks of industrial installations
and utility substations for all levels of voltage.
The Sepam series 20 family consists of simple, high-performing solutions, suited to
demanding applications that call for current and voltage metering.
Sepam series 20 selection guide by application
Selection criteria
Series 20
Measurements
I
Specific protection functions
Applications
Substation
Transformer
Motor
Busbar
U
U
Loss of mains
(ROCOF)
B21
B22
S20
T20
M20
Main functions
MT10178
Sepam a modular solution.
Protection
b Overcurrent and earth fault protection with adjustable time reset and with switching
from on setting group to the other controlled by a logic order.
b Earth fault protection insensitivity to transformer switching.
b Detection of phase unbalance.
b RMS thermal protection which takes into account external operating temperature
and ventilation operating rates.
b Rate of change of frequency protection (ROCOF), for a fast and reliable
disconnection.
Communication
Sepam is totally compatible with the Modbus communication standard.
All the data needed for centralized equipment management from a remote
monitoring and control system are available via the Modbus communication port:
b reading: all measurements, alarms, protection settings,...
b writing: breaking device remote control orders,...
Diagnosis
3 types of diagnosis data for improved operation:
b network and machine diagnosis: tripping current, unbalance ratio, disturbance
recording
b switchgear diagnosis: cumulative breaking current, operating time
b diagnosis of the protection unit and additional modules: continuous self-testing,
watchdog.
Control and monitoring
Circuit breaker program logic ready to use, requiring no auxiliary relays or additional
wiring.
Sepam with basic UMI and with fixed advanced UMI.
User Machine Interface
2 levels of User Machine Interface (UMI) are available according to the user’s needs:
b basic UMI:
an economical solution for installations that do not require local operation (run via a
remote monitoring and control system)
b fixed or remote advanced UMI:
a graphic LCD display and 9-key keypad are used to display the measurement and
diagnosis values, alarm and operating messages and provide access to protection
and parameter setting values, for installations that are operated locally.
MT10590
1
Presentation
Expert UMI software
The SFT2841 PC software tool gives access to all the Sepam functions, with all the
facilities and convenience provided by a Windows type environment.
Example of an SFT2841 software screen (expert UMI).
1/2
Sepam series 20
Functions
Selection table
Type of Sepam
Substation
Transformer
Motor
Busbar
Protections
ANSI code
S20
T20
M20
B21 (4)
B22
Phase overcurrent (1)
50/51
4
4
4
Earth fault (or neutral) (1)
50N/51N 50G/51G
4
4
4
Unbalance / negative sequence
46
1
1
1
Thermal overload
49 RMS
2
2
Phase undercurrent
37
1
Excessive starting time, locked rotor
48/51LR
1
Starts per hour
66
1
Positive sequence undervoltage
27D/47
2
2
Remanent undervoltage
27R
1
1
Phase-to-phase undervoltage
27
2
2
Phase-to-neutral undervoltage
27S
1
1
Maximum de tension composée
59
2
2
Phase-to-phase overvoltage
59N
2
2
Underfrequency
81L
2
2
Overfrequency
81H
1
1
Rate of change of frequency
81R
1
Recloser (4 cycles)
79
v
Thermostat / Buchholz
v
Temperature monitoring
38/49T
v
v
(with MET148-2, 2 set points per sensor)
Metering
Phase current I1,I2,I3 RMS
b
b
b
Residual current I0
b
b
b
Average current I1, I2, I3
b
b
b
Peak demand phase current IM1,IM2,IM3
b
b
b
Line voltage U21, U32, U13
b
b
Phase-to-neutral voltage V1, V2, V3
b
b
Residual voltage V0
b
b
Positive sequence voltage / rotation direction
b
b
Frequency
b
b
Temperature measurement
v
v
Network and machine diagnosis
Tripping current I1,I2,I3, I0
b
b
b
Unbalance ratio / negative sequence current Ii
b
b
b
Running hours counter / operating time
b
b
Thermal capacity used
b
b
Remaining operating time before
b
b
overload tripping
Waiting time after overload tripping
b
b
Starting current and time / overload
b
Start inhibit time delay,
b
number of starts before inhibition
Disturbance recording
b
b
b
b
b
Switchgear diagnostic
Cumulative breaking current2
b
b
b
Trip circuit supervision
v
v
v
v
v
Number of operations
v
v
v
Operating time
v
v
v
Charging time
v
v
v
Self-diagnosis
Watchdog
b
b
b
b
b
Output relay test (2)
v
v
v
v
v
Control and monitoring
Circuit breaker / contactor control (3)
v
v
v
v
v
Logic discrimination
v
v
v
4 addressable logic outputs
b
b
b
b
b
Additional modules
MET148-2 module - 8 temperature sensor inputs
v
v
MSA141 module - 1 low level analog output
v
v
v
v
v
MES114 module or MES114E module or MES114F module- (10I/4O)
v
v
v
v
v
ACE949-2 module (2-wire) or ACE959 (4-wire) RS 485 interface or ACE937
v
v
v
v
v
optical fibre interface
b standard, v according to parameter setting and MES114 or MET148-2 input/output module options.
(1) 4 relays with the exclusive possibility of logic discrimination or switching from one 2-relay group of settings to another 2-relay group (exclusive choice).
(2) with advanced UMI option only.
(3) for shunt trip unit or undervoltage release coil according to parameter setting.
(4) performs B20 type functions.
1/3
1
Sepam series 20
1
Electrical characteristics
Analog inputs
Current transformer
1 A or 5 A CT (with CCA630)
1 A to 6250 A ratings
input impedance
consumption
Voltage transformer
220 V to 250 kV ratings
permanent thermal withstand
1 second overload
input impedance
input voltage
permanent thermal withstand
1 second overload
< 0.001 Ω
< 0.001 VA at 1 A
< 0.025 VA at 5 A
3 In
100 In
> 100 kΩ
100 to 230/√3 V
230 V
480 V
Temperature sensor input
Type of temperature sensor
Pt 100
Ni 100 / 120
Isolation from earth
no
no
Current injected in sensor
4 mA
4 mA
Logic inputs
MES114
MES114E
Voltage
24 to 250 V DC
110 to 125 V DC
110 V AC
Range
19.2 to 275 V DC
88 to 150 V DC
88 to 132 V AC
Frequency
47 to 63 Hz
Typical consumption
3 mA
3 mA
3 mA
Typical switching threshold
14 V DC
82 V DC
58 V AC
Control output relays (O1, O2, O11 contacts)
Voltage
DC
24 / 48 V DC
127 V DC
AC (47.5 to 63 Hz)
Continuous current
8A
8A
Breaking
resistive load
8/4A
0.7 A
capacity
L/R load < 20 ms
6/2A
0.5 A
L/R load < 40 ms
4/1A
0.2 A
resistive load
load p.f. > 0.3
Making capacity
< 15 A for 200 ms
Indication relay outputs (O3, O4, O12, O13, O14 contacts)
Voltage
DC
24 / 48 V DC
127 V DC
AC (47.5 to 63 Hz)
Continuous current
2A
2A
Breaking
L/R load < 20ms
2/1A
0.5 A
capacity
load p.f. > 0.3
Power supply
max. cons. (1)
range
deactivated cons. (1)
24 / 250 V DC
-20 % +10 %
2 to 4,5 W
6 to 8 W
110 / 240 V AC
-20 % +10 %
3 to 9 VA
9 to 15 VA
47.5 to 63 Hz
brownout withstand
10 ms
Analog output
Current
4 - 20 mA, 0 - 20 mA, 0 - 10 mA
Load impedance
< 600 Ω (wiring included)
Accuracy
0.50 %
1) According to configuration.
1/4
MES114F
220 to 250 V DC
176 to 275 V DC
3 mA
154 V DC
220 to 240 V AC
176 to 264 V AC
47 to 63 Hz
3 mA
120 V AC
220 V DC
8A
0.3 A
0.2 A
0.1 A
100 to 240 V AC
8A
8A
5A
220 V DC
2A
0.15 A
100 to 240 V AC
2A
1A
inrush current
< 10 A for 10 ms
< 15 A for first
half-period
Environmental characteristics
Sepam series 20
Electromagnetic comptability
IEC / EN standard
Level / Class
EN 55022 / CISPR22
EN 55022 / CISPR22
A
B
60255-22-3 / 61000-4-3
60255-22-2 / 61000-4-2
III
III
10 V/m
8 kV air
6 kV contact
Immunity tests – Conducted disturbances
Immunity to conducted RF disturbances
Fast transient bursts
1 MHz damped oscillating wave
61000-4-6
60255-22-4 / 61000-4-4
60255-22-1
III
IV
III
10 V
Impulse waves
Voltage interruptions
61000-4-5
60255-11
III
IEC / EN standard
Level / Class
Value
60255-21-1
60255-21-2
60255-21-3
2
2
2
1 Gn
10 Gn / 11 ms
60255-21-1
60255-21-2
60255-21-2
2 (1)
2 (1)
2 (1)
2 Gn
30 Gn / 11 ms
20 Gn / 16 ms
Emission tests
Disturbing field emission
Conducted disturbance emission
Immunity tests – Radiated disturbances
Immunity to radiated fields
Electrostatic discharge
Mechanical robustness
In operation
Vibrations
Shocks
Earthquakes
De-energised
Vibrations
Shocks
Jolts
Climatic withstand
Value
1
2.5 kV MC
1 kV MD
100% 10 ms
IEC / EN standard
Level / Class
Value
In operation
Exposure to cold
Exposure to dry heat
Continuous exposure to damp heat
60068-2-1
60068-2-2
60068-2-3
Ab
Bb
Ca
Temperature variation with specified variation rate
60068-2-14
Nb
-25°C
+70°C
93% HR; 40°C
10 days
–25 °C à +70 °C
5°C/min
Salt mist
Influence of corrosion
In storage (4)
Exposure to cold
Exposure to dry heat
Continuous exposure to damp heat
60068-2-52
60654-4
Kb / 2
60068-2-1
60068-2-2
60068-2-3
Ab
Bb
Ca
-25 °C
+70 °C
93% RH; 40 °C
56 days
IEC / EN standard
Level / Class
Value
60529
IP52
Other panels closed, except for
rear panel IP20
NEMA
Type 12
with gasket supplied
Safety
Enclosure safety tests
Front panel tightness
Fire withstand
Electrical safety tests
Earth continuity
1.2/50 µs impulse wave
Power frequency dielectric withstand
Clean industrial air
60695-2-11
650°C with glow wire
61131-2
60255-5
60255-5
30 A
5 kV (2)
2 kV 1 mn (3)
Certification
CE
generic standard EN 50081-2
UL UL508 - CSA C22.2 n° 14-95
CSA
CSA C22.2 n° 94-M91 / n° 0.17-00
(1) Results given for intrinsic withstand, excluding support equipment.
(2) Except for communication: 3 kV in common mode and 1 kV in differential mode.
(3) Except for communication: 1 kVrms.
(4) Sepam must be stored in its original packing.
European directives
89/336/EEC
Electromagnétic Compatibility (EMC) Directive
92/31/EEC Amendment
Amendment
92/68/EEC
73/23/EEC Low Voltage Directive
93/68/EEC Amendment
File E212533
File E210625
1/5
YFJYVIIVGIT
6FKQHLGHU(OHFWULF
)55(9$
Metering functions
Contents
Characteristics
2/2
Phase current
Residual current
2/3
Average current and peak demand currents
2/4
Phase-to-phase voltage
Phase to neutral voltage
2/5
Residual voltage
Positive sequence voltage
2/6
Frequency
Temperature
2/7
Tripping current
Negative sequence / unbalance
2/8
Disturbance recording
2/9
Running hours counter and operating time
Thermal capacity used
2/10
Operating time before tripping
Waiting time after tripping
2/11
Starting current and
starting / overload time
2/12
Number of starts before inhibition
Start inhibit time delay
2/13
Cumulative breaking current and number of operations
2/14
Operating time
Charging time
2/15
2/1
2
Metering functions
Characteristics
General settings
Rated phase current In (sensor primary current)
Selection
2 or 3 x 1 A / 5 A CTs
3 LPCT sensors
Basic current Ib
Residual current In0
2
Rated primary phase-to-phase voltage Unp
(Vnp: Rated primary phase-to-neutral voltage: Vnp = Unp/3)
Rated secondary phase-to-phase voltage Uns
sum of 3 phase currents
CSH120 or CSH200 core balance CT
1 A / 5 A CT + CSH30 interposing ring CT
core balance CT + ACE990 (the core bal. CT
ratio 1/n should be such that: 50 y n y 1500)
3 VTs: V1, V2, V3
2 VTs: U21, U32
1 VT: U21
Frequency
Metering functions
Phase current
Range
0.1 to 1.5 In
Residual current
0.1 to 1.5 In0
Average current and peak demand phase current
0.1 to 1.5 In
Phase-to-phase or phase-to-neutral voltage
Residual voltage
0.05 to 1.2 Unp
0.05 to 1.2 Vnp
0.015 to 3 Vnp
Positive sequence voltage
Frequency
Temperature
0.05 to 1.2 Vnp
50 ±5 Hz or 60 ±5 Hz
-30 °C to +200 °C or -22 °F to 392 °F
Range
1 A to 6250 A
25 A to 3150 A (1)
0.4 to 1.3 In
see rated phase current In
2 A rating or 20 A rating
1 A to 6250 A (CT primary)
according to current to be monitored and use of
ACE990
220 V to 250 kV
100, 110, 115, 120, 200, 230 V
100, 110, 115, 120 V
100, 110, 115, 120 V
50 Hz or 60 Hz
Accuracy (2)
±1 % typical
±2 % from 0.3 to 1.5 In
±5 % if < 0.3 In
±1 % typical
±2 % from 0.3 to 1.5 In0
±5 % if < 0.3 In0
±1 % typical
±2 % from 0.3 to 1.5 In
±5 % if < 0.3 In
±1 % from 0.5 to 1.2 Unp or Vnp
±2 % from 0.05 to 0.5 Unp or Vnp
±1 % from 0.5 to 3 Vnp
±2 % from 0.05 to 0.5 Vnp
±5 % from 0.015 to 0.05 Vnp
±5 % at Vnp
±0.05 Hz
±1 °C from +20 to +140 °C
±2 °C
Network diagnosis assistance functions
Phase tripping current
0.1 to 40 In
±5 %
Earth fault tripping current
0.1 to 20 In0
±5 %
Unbalance / negative sequence current li
10 % to 500 % Ib
±2 %
Machine operation assistance functions
Running hours counter / operating time
0 to 65535 hours
±1 % or ±0.5 h
Thermal capacity used
0 to 800 % (100 % for phase I = Ib)
±1 %
Remaining operating time before overload tripping
0 to 999 mn
±1 mn
Waiting time after overload tripping
0 to 999 mn
±1 mn
Starting current
1.2 Ib to 24 In
±5 %
Starting time
0 to 300 s
±10 ms
Start inhibit time delay
0 to 360 mn
±1 mn
Number of starts before inhibition
0 to 60
1
Switchgear diagnosis assistance functions
Cumulative breaking current
0 to 65535 kA2
±10 %
Number of operations
0 to 65535
1
Operating time
20 to 100 ms
±1 ms
Charging time
1 to 20 s
±0.5 s
(1) Table of In values in Amps: 25, 50, 100, 125, 133, 200, 250, 320, 400, 500, 630, 666, 1000, 1600, 2000, 3150.
(2) In reference conditions (IEC 60255-6), typical at In or Un.
2/2
Metering functions
Phase current
Residual current
Phase current
Operation
This function gives the RMS value of the phase currents:
b I1: phase 1 current
b I2: phase 2 current
b I3: phase 3 current.
It is based on RMS current measurement and takes into account harmonics up to
number 17.
2
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
key
Characteristics
Measurement range
Unit
Accuracy
Display format (3)
Resolution
Refresh interval
(1) In rated current set in the general settings.
(2) At In, in reference conditions (IEC 60255-6).
(3) Display of values: 0.2 to 40 In.
0.1 to 1.5 In (1)
A or kA
typically ±1 % (2)
±2 % from 0.3 to 1.5 In
±5 % if < 0.3 In
3 significant digits
0.1 A or 1 digit
1 second (typical)
Residual current
Operation
This operation gives the RMS value of the residual current I0.
It is based on measurement of the fundamental component.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
key
Characteristics
Measurement range
Connection to 3 phase CT:
Connection to 1 CT with CSH30 interposing ring CT
Connection to core balance CT with ACE990
Connection to CSH residual
2 A rating
current sensor
20 A rating
Unit
Accuracy (2)
0.1 to 1.5 In0 (1)
0.1 to 1.5 In0 (1)
0.1 to 1.5 In0 (1)
0.2 to 3 A
2 to 30 A
A or kA
typically ±1 % at In0
±2 % from 0.3 to 1.5 In0
±5 % if < 0.3 In0
3 significant digits
0.1 A or 1 digit
Display format
Resolution
(1) In0 rated current set in the general settings.
(2) in reference conditions (IEC 60255-6), excluding sensor accuracy.
2/3
Metering functions
Average current and peak
demand currents
Operation
This function gives:
b the average RMS current for each phase that has been obtained for each
integration interval
b the greatest average RMS current value for each phase that has been obtained
since the last reset.
The values are refreshed after each "integration interval", an interval that may be set
from 5 to 60 mn.
Readout
2
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
Resetting to zero:
b press the clear key on the display when a peak demand current is displayed
b via the clear command in the SFT2841 software
b via the communication link (remote control order TC6).
Characteristics
Measurement range
Unit
Accuracy
Display format
Resolution
Integration interval
(1) In rated current set in the general settings.
(2) at In, in reference conditions (IEC 60255-6).
2/4
0.1 to 1.5 In (1)
A or kA
typically ±1 % (2)
±2 % from 0.3 to 1.5 In
±5 % if < 0.3 In
3 significant digits
0.1 A or 1 digit
5, 10, 15, 30, 60 minutes
Metering functions
Phase-to-phase voltage
Phase to neutral voltage
Phase-to-phase voltage
Operation
This function gives the RMS value of the 50 or 60 Hz component of phase-to-phase
voltages (according to voltage sensor connections):
b U21: voltage between phases 2 and 1
b U32: voltage between phases 3 and 2
b U13: voltage between phases 1 and 3.
It is based on measurement of the fundamental component.
2
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
key
Characteristics
Measurement range
Unit
Accuracy (2)
Display format
Resolution
Refresh interval
(1) Un nominal rating set in the general settings.
(2) at Un, in reference conditions (IEC 60255-6).
0.05 to 1.2 Unp (1)
V or kV
±1 % from 0.5 to 1.2 Unp
±2 % from 0,05 to 0.5 Unp
3 significant digits
1 V or 1 digit
1 second (typical)
Phase-to-neutral voltage
Operation
This function gives the RMS value of the 50 or 60 Hz component of phase-to-neutral
voltages:
b V1: phase 1 phase-to-neutral voltage
b V2: phase 2 phase-to-neutral voltage
b V3: phase 3 phase-to-neutral voltage.
It is based on measurement of the fundamental component.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
key
Characteristics
Measurement range
Unit
Accuracy (2)
Display format
Resolution
Refresh interval
(1) Vnp: primary rated phase-to-neutral voltage (Vnp = Unp/3).
(2) at Vnp in reference conditions (IEC 60255-6).
0.05 to 1.2 Vnp (1)
V or kV
±1 % from 0.5 to 1.2 Vnp
±2 % from 0.05 to 0.5 Vnp
3 significant digits
1 V or 1 digit
1 second (typical)
2/5
Metering functions
Residual voltage
Positive sequence voltage
Residual voltage
Operation
This function gives the value of the residual voltage V0 = (V1 + V2 + V3).
V0 is measured:
b by taking the internal sum of the 3 phase voltages
b by an open star / delta VT.
It is based on measurement of the fundamental component.
Readout
2
The measurement may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
Characteristics
Measurement range
Unit
Accuracy
Display format
Resolution
Refresh interval
(1) Vnp: primary rated phase-to-neutral voltage (Vnp = Unp/3).
0.015 Vnp to 3 Vnp (1)
V or kV
±1 % from 0.5 to 3 Vnp
±2 % from 0.05 to 0.5 Vnp
±5 % from 0.015 to 0.05 Vnp
3 significant digits
1 V or 1 digit
1 second (typical)
Positive sequence voltage
Operation
This function gives the calculated value of the positive sequence voltage Vd.
Readout
The measurement may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
Characteristics
Measurement range
Unit
Accuracy
Display format
Resolution
Refresh interval
(1) Vnp: primary rated phase-to-neutral voltage (Vnp = Unp/3).
2/6
0.05 to 1.2 Vnp (1)
V or kV
±2 % at Vnp
3 significant digits
1 V or 1 digit
1 second (typical)
Metering functions
Frequency
Temperature
Frequency
Operation
This function gives the frequency value.
Frequency is measured via the following:
b based on U21, if only one phase-to-phase voltage is connected to the Sepam
b based on positive sequence voltage, if the Sepam includes U21 and U32
measurements.
Frequency is not measured if:
b the voltage U21 or positive sequence voltage Vd is less than 40 % of Un
b the frequency is outside the measurement range.
Readout
The measurement may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
key
Characteristics
Rated frequency
Range
50 Hz
60 Hz
Accuracy (1)
Display format
Resolution
Refresh interval
(1) At Un in reference conditions (IEC 60255-6).
50 Hz, 60 Hz
45 Hz to 55 Hz
55 Hz to 65 Hz
±0.05 Hz
3 significant digits
0.01 Hz or 1 digit
1 second (typical)
Temperature
Operation
This function gives the temperature value measured by resistance temperature
detectors (RTDs):
b platinum Pt100 (100 Ω at 0 °C) in accordance with the IEC 60751 and DIN 43760
standards
b nickel 100 Ω or 120 Ω (at 0 °C).
Each RTD channel gives one measurement:
b tx = RTD x temperature.
The function also indicates RTD faults:
b RTD disconnected (tx > 205 °C)
b RTD shorted (tx < -35 °C).
In the event of a fault, display of the value is inhibited.
The associated monitoring function generates a maintenance alarm.
Readout
The measurement may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
key
Characteristics
Range
Resolution
-30 °C to +200 °C
or -22 °F to +392 °F
±2 °C
±1 °C from +20 to +140 °C
1 °C or 1 °F
Refresh interval
5 seconds (typical)
Accuracy (1)
(1) At Un in reference conditions (IEC 60255-6).
Accuracy derating according to wiring : see chapter "installation of MET148-2
module" page 6/23.
2/7
2
Tripping current
Negative sequence / unbalance
Network diagnosis
functions
Tripping current
TRIP 1
MT10252
I
2
Operation
This function gives the RMS value of currents at the prospective time of the last trip:
b TRIP1: phase 1 current
b TRIP2: phase 2 current
b TRIP3: phase 3 current
b TRIPI0: residual current.
It is based on measurement of the fundamental component.
This measurement is defined as the maximum RMS value measured during a 30 ms
interval after the activation of the tripping contact on output O1.
tripping order
30 ms
T0
t
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
Characteristics
Measurement range
Residual current
Unit
Accuracy
Display format
Resolution
(1) In/In0 rated current set in the general settings.
phase current 0.1 to 40 In (1)
0.1 to 20 In0 (1)
A or kA
±5 % ±1 digit
3 significant digits
0.1 A or 1 digit
Negative sequence / unbalance
Operation
This function gives the negative sequence component: T = Ii/Ib
The negative sequence current is determined based on the phase currents:
b 3 phases
2
1
Ii = --- × ( I1 + a I2 + aI3 )
3
2π
j ------3
with a = e
b 2 phases
1 × I1 – a 2 I3
Ii = -----3
2π
j ------3
with a = e
These 2 formulas are equivalent when there is no earth fault.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
Characteristics
Measurement range
Unit
Accuracy
Display format
Resolution
Refresh interval
2/8
10 to 500
% Ib
±2 %
3 significant digits
1%
1 second (typical)
Disturbance recording
Network diagnosis
functions
Operation
This function is used to record analog signal and logical states.
Record storage is activated according to parameter setting by a triggering event.
The stored event begins before the triggering event and continues afterwards.
The record comprises the following information:
b values sampled from the different signals
b date
b characteristics of the recorded channels.
The files are recorded in FIFO (First In First Out) type shift storage: the oldest record
is erased when a new record is triggered.
Transfer
Files may be transferred locally or remotely:
b locally: using a PC which is connected to the pocket terminal connector and has
the SFT2841 software tool
b remotely: using a software tool specific to the remote monitoring and control
system.
Recovery
The signals are recovered from a record by means of the SFT2826 software tool.
Principle
MT10181
stored record
time
triggering event (1)
Characteristics
x periods before the triggering event (1)
total 86 periods
Record content
Set-up file:
date, channel characteristics, measuring transformer ratio
Sample file:
12 values per period/recorded signal
Analog signals recorded (2)
4 current channels (I1, I2, I3, I0) or
4 voltage channels (V1, V2, V3)
Logical signals
10 digital inputs, outputs O1, pick-up
Number of stored records
2
File format
COMTRADE 97
(1) According to parameter setting with the SFT2841 (default setting 36 cycles).
(2) According to sensor type and connection.
Record duration
2/9
2
Machine operation
assistance functions
Running hours counter and
operating time
Thermal capacity used
Running hours counter / operating time
The counter gives the running total of time during which the protected device (motor
or transformer) has been operating (I > 0.1Ib). The initial counter value may be
modified using the SFT2841 software.
The counter is saved every 4 hours.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
2
key
Characteristics
Range
Unit
0 to 65535
hours
Thermal capacity used
Operation
The thermal capacity used is calculated by the thermal protection function.
The thermal capacity used is related to the load. The thermal capacity used
measurement is given as a percentage of the rated thermal capacity.
Saving of thermal capacity used
When the protection unit trips, the current thermal capacity used increased by 10 % (1)
is saved. The saved value is reset to 0 when the thermal capacity used has
decreased sufficiently for the start inhibit time delay to be zero. The saved value is
used again after a Sepam power outage, making it possible to start over with the
temperature buildup that caused the trip.
(1) The 10 % increase is used to take into account the average temperature buildup of motors
when starting.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
key
Characteristics
2/10
Measurement range
0 to 800 %
Unit
%
Display format
3 significant digits
Resolution
1%
Refresh interval
1 second (typical)
Machine operation
assistance functions
Operating time before tripping
Waiting time after tripping
Remaining operating time before overload
tripping
Operation
The time is calculated by the thermal protection function. It depends on the thermal
capacity used.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
2
key
Characteristics
Measurement range
0 to 999 mn
Unit
mn
Display format
3 significant digits
Resolution
1 mn
Refresh interval
1 second (typical)
Waiting time after overload tripping
Operation
The time is calculated by the thermal protection function. It depends on the thermal
capacity used.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
Characteristics
Measurement range
0 to 999 mn
Unit
mn
Display format
3 significant digits
Resolution
1 mn
Refresh period
1 second (typical)
2/11
Machine operation
assistance functions
Starting current and
starting / overload time
Operation
The starting / overload time is the time between the moment at which one of
the 3 phase currents exceeds 1.2 Ib and the moment at which the 3 currents drop
back below 1.2 Ib.
The maximum phase current obtained during this period is the starting / overload
current.
The 2 values are saved in the event of an auxiliary power failure.
Readout
2
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
Characteristics
Starting / overload time
Measurement range
0 to 300 s
Unit
s or ms
Display format
3 significant digits
Resolution
10 ms or 1 digit
Refresh interval
1 second (typical)
Starting / overload current
Measurement range
1.2 Ib to 24 In (1)
Unit
A or kA
Display format
3 significant digits
Resolution
0.1 A or 1 digit
Refresh interval
1 second (typical)
(1) Or 65.5 kA.
2/12
Machine operation
assistance functions
Number of starts before inhibition
Start inhibit time delay
Number of starts before inhibition
Operation
The number of starts allowed before inhbition is calculated by the number of starts
protection function.
The number of starts depends on the thermal state of the motor.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
2
key
Resetting to zero
The number of starts counters may be reset to zero as follows, after the entry
of a password:
b on the advanced UMI display unit by pressing the "clear" key
b on the display of a PC with the SFT2841 software.
Characteristics
Measurement range
0 to 60
Unit
none
Display format
3 significant digits
Resolution
1
Refresh interval
1 second (typical)
Start inhibit time delay
Operation
The time delay is calculated by the number of starts protection function.
If the number of starts protection function indicates that starting is inhibited, the time
given represents the waiting time before starting is allowed.
Readout
The number of starts and waiting time may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
Characteristics
Measurement range
0 to 360 mn
Unit
mn
Display format
3 significant digits
Resolution
1 mn
Refresh interval
1 second (typical)
2/13
Switchgear diagnosis
functions
Cumulative breaking current and
number of operations
Cumulative breaking current
Operation
This function indicates the cumulative breaking current in square kiloamperes (kA)2
for five current ranges.
It is based on measurement of the fundamental component.
The current ranges displayed are:
b 0 < I < 2 In
b 2 In < I < 5 In
b 5 In < I < 10 In
b 10 In < I < 40 In
b I > 40 In.
The function also provides the total number of operations and the cumulative total of
breaking current in (kA)².
Refer to switchgear documentation for use of this information.
2
Number of operation
The function is activated by tripping commands (O1 relay).
Each value is saved in the event of a power failure.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
key
b the display of a PC with the SFT2841 software
b the communication link.
The initial values may be introduced using the SFT2841 software tool to take into
account the real state of a used breaking device.
Characteristics
Breaking current (kA)2
Range
Unit
Accuracy (1)
Number of operations
Range
(1) At In, in reference conditions (IEC 60255-6).
2/14
0 to 65535 (kA)2
primary (kA)2
±10 %
0 to 65535
Switchgear diagnosis
functions
Operating time
Charging time
Operating time
Operation
This function gives the value of the opening operating time of a breaking device (1) and
change of status of the device open position contact connected to the I11 input (2).
The function is inhibited when the input is set for AC voltage (3).
The value is saved in the event of a power failure.
Readout
The measurement may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
2
key
(1) Refer to switchgear documentation for use of this information.
(2) Optional MES module.
(3) Optional MES114E or MES114F modules.
Characteristics
Measurement range
Unit
Accuracy
Display format
20 to 100
ms
typically ±1 ms
3 significant digits
Charging time
Operation
This function gives the value of the breaking device (1) operating mechanism charging
time, determined according to the device closed position status change contact and
the end of charging contact connected to the Sepam I12 and I24 (2).
The value is saved in the event of a power failure.
Readout
The measurement may be accessed via:
b the display of a Sepam with advanced UMI by pressing the
b the display of a PC with the SFT2841 software
b the communication link.
key
(1) Refer to switchgear documentation for use of this information.
(2) Optional MES114 or MES114E or MES114F modules.
Characteristics
Measurement range
Unit
Accuracy
Display format
1 to 20
s
±0.5 sec
3 significant digits
2/15
Switchgear diagnosis
functions
2
2/16
Protection functions
Contents
Setting ranges
3/2
Phase-to-phase undervoltage
ANSI code 27
3/4
Positive sequence undervoltage
and phase rotation direction check
ANSI code 27D/47
3/5
Remanent undervoltage
ANSI code 27R
3/6
Phase-to-neutral undervoltage
ANSI code 27S
3/7
Phase undercurrent
ANSI code 37
3/8
Negative sequence / unbalance
ANSI code 46
3/9
Excessive starting time, locked rotor
ANSI code 48/51LR
3/11
Thermal overload
ANSI code 49RMS
3/12
Temperature monitoring
ANSI code 49T/38
3/21
Phase overcurrent
ANSI code 50/51
3/22
Earth fault
ANSI code 50N/51N or 50G/51G
3/24
Phase-to-phase overvoltage
ANSI code 59
3/26
Neutral voltage displacement
ANSI code 59N
3/27
Starts per hour
ANSI code 66
3/28
Recloser
ANSI code 79
3/29
Overfrequency
ANSI code 81H
3/31
Underfrequency
ANSI code 81L
3/32
Rate of change of frequency
ANSI code 81R
3/33
General IDMT protection functions
3/34
3/1
3
Protection functions
General settings
Rated phase current In (sensor primary
current)
Setting ranges
Selection
Range
2 or 3 x 1 A / 5 A CTs
1 A to 6250 A
25 A to 3150 A (2)
0.4 to 1.3 In
sum of 3 phase currents
see rated phase current In
CSH120 or CSH200 core balance CT
2 A rating or 20 A rating
1 A / 5 A CT + CSH30 interposing ring CT
1 A to 6250 A (CT primary)
core balance CT + ACE990 (the core bal. CT according to current to be monitored and use of ACE990
ratio 1/n should be such that: 50 y n y 1500)
220 V to 250 kV
3 LPCT sensors
Basic current Ib
Residual current In0
Rated primary phase-to-phase voltage Unp
(Vnp: Rated primary phase-to-neutral voltage:
Vnp = Unp/3)
Rated secondary phase-to-phase voltage Uns 3 VTs: V1, V2, V3
3
2 VTs: U21, U32
1 VT: U21
Frequency
Functions
Settings
ANSI 50/51 - Phase overcurrent
Tripping curve
Is set point
Timer hold delay
Definite time
SIT, LTI, VIT, EIT, UIT (1)
RI
IEC: SIT/A, LTI/B, VIT/B, EIT/C
IEEE: MI (D), VI (E), EI (F)
IAC: I, VI, EI
0.1 to 24 In
0.1 to 2.4 In
Definite time (DT; timer hold)
IDMT (IDMT; reset time)
ANSI 50N/51N or 50G/51G - Earth fault
Tripping curve
Is0 set point
Timer hold delay
100, 110, 115, 120,
200, 230 V
100, 110, 115, 120 V
100, 110, 115, 120 V
50 Hz or 60 Hz
Definite time
SIT, LTI, VIT, EIT, UIT (1)
RI
IEC: SIT/A,LTI/B, VIT/B, EIT/C
IEEE: MI (D), VI (E), EI (F)
IAC: I, VI, EI
0.1 to 15 In0
0.1 to 1 In0
Definite time (DT; timer hold)
IDMT (IDMT; reset time)
Time delays
Timer hold delay
DT
DT
DT
DT or IDMT
DT or IDMT
DT or IDMT
Definite time
IDMT
Time hold delay
DT
DT
DT
DT or IDMT
DT or IDMT
DT or IDMT
Definite time
IDMT
Inst. 0.05 s to 300 s
0.1 s to 12.5 s at 10 Is
Inst. 0.05 s to 300 s
0.5 s to 20 s
Inst. 0.05 s to 300 s
0.1 s to 12.5 s at 10 Is0
Inst. 0.05 s to 300 s
0.5 s to 300 s
ANSI 46 - Negative sequence / unbalance
Definite time
0.1 to 5 Ib
0.1 s to 300 s
IDMT
0.1 to 0.5 Ib (Schneider Electric) 0.1 to 1Ib (IEC, IEEE)
0.1 s to 1 s
ANSI 49RMS - Thermal overload
Operating rate 1
Operating rate 2
Negative sequence coefficient
0 - 2.25 - 4.5 - 9
Time constant
Heat rise
T1: 5 to 120 mn
T1: 5 to 120 mn
Cooling
T2: 5 to 600 mn
T2: 5 to 600 mn
Alarm; tripping
50 to 300 % of normal heat rise
Cold curve modification coefficient
0 to 100 %
Operating rate change condition
By Is set point adjustable from 0.25 to 8 Ib (motor)
By logic input I26 (transformer)
Maximum equipment temperature
60 to 200 °C
ANSI 37 - Phase undercurrent
0.15 to 1 Ib
ANSI 48/51LR - Excessive starting time/locked rotor
0.5 Ib to 5 Ib
3/2
0.05 s to 300 s
ST start time
LT and LTS time delay
0.5 s to 300 s
0.05 s to 300 s
Protection functions
Functions
Setting ranges
Settings
Time delays
ANSI 66 - Starts per hour
1 to 60 per hour
1 to 60 consecutive
hour
time between starts
1 to 6 h
0 to 90 mn
ANSI 49T/38 - Temperature (RTDs)
0 to 180 °C (or 32 to 356 °F)
ANSI 27D/47 - Positive sequence undervoltage
30 to 100 % of Vnp (Unp/3)
0.05 s to 300 s
5 to 100 % of Unp
0.05 s to 300 s
5 to 100 % of Unp
0.05 s to 300 s
5 to 100 % of Vnp
0.05 s to 300 s
50 to 150 % of Unp
0.05 s to 300 s
2 to 80 % of Unp
0.05 s to 300 s
50 to 53 Hz or 60 to 63 Hz
0.1 s to 300 s
45 to 50 Hz or 55 to 60 Hz
0.1 s to 300 s
ANSI 27R - Remanent undervoltage
ANSI 27 - Phase-to-phase undervoltage
ANSI 27S - Phase-to-neutral undervoltage
ANSI 59 - Phase-to-phase overvoltage
3
ANSI 59N - Neutral voltage displacement
ANSI 81H - Overfrequency
ANSI 81L - Underfrequency
Set point 1 and set point 2
ANSI 81R - Rate of change of frequency
0.1 to 10 Hz/s
Reminder: In current, Unp rated voltage and In0 current are general settings that are made at the time of Sepam commissioning.
They are given as the values on the measurement transformer primary windings.
The current, voltage and frequency values are set by direct entry of the values (resolution: 1 A, 1 V, 0.1 Hz, 1 °C or F).
(1) Tripping as of 1.2 Is.
(2) Table of In values in Amps: 25, 50, 100, 125, 133, 200, 250, 320, 400, 500, 630, 666, 1000, 1600, 2000, 3150.
Inst. 0.15 s to 300 s
3/3
Phase-to-phase undervoltage
ANSI code 27
Protection functions
Operation
The protection function is three-phase:
b it picks up if one of the 3 phase-to-phase voltages drops below the Us set point
b it includes a definite time delay T.
MT10873
Block diagram
U21
U32
U < Us
T
0
U13
time-delayed output
“pick-up” signal
Characteristics
Us set point
3
Setting
5 % Unp to 100 % Unp
Accuracy (1)
±2 % or 0.005 Unp
Resolution
1%
Drop-out/pick-up ratio
103 % ±2.5 %
Time delay T
Setting
50 ms to 300 s
Accuracy (1)
±2 %, or ±25 ms
Resolution
10 ms or 1 digit
Characteristic times
Operation time
pick-up < 35 ms (typically 25 ms)
Overshoot time
< 35 ms
Reset time
< 40 ms
(1) In reference conditions (IEC 60255-6).
3/4
Positive sequence undervoltage
and phase rotation direction check
ANSI code 27D/47
Protection functions
Operation
Positive sequence undervoltage
The protection picks up when the positive sequence component Vd of a three-phase
voltage system drops below the Vsd set point with
1
Vd = --- ( V1 + V2 + a 2 V3 )
3
1
Vd = --- ( U21 – a 2 U32 )
3
U
with V = ------- and a = e
3
j 2π
------3
b it includes a definite time delay T
b it allows drops in motor electrical torque to be detected.
Phase rotation direction
This protection also allows the phase rotation direction to be detected.
The protection considers that the phase rotation direction is inverse when the positive
sequence voltage is less than 10 % of Unp and when the phase-to-phase voltage is
greater than 80 % of Unp.
MT10872
Block diagram
Vd
Vd < Vsd
T
0
time-delayed output
“pick-up” signal
Vd < 0.1Un
U21
(or V1)
U > 0.8 Un
&
rotation display
(2)
Characteristics
Vsd set point
Setting
15 % Unp to 60 % Unp
Accuracy (1)
±2 %
Pick-up/drop-out ratio
103 % ±2,5 %
Resolution
1%
Time delay
Setting
50 ms to 300 s
Accuracy (1)
±2 %, or ±25 ms
Resolution
10 ms or 1 digit
Characteristics times
Operating time
pick-up < 55 ms
Overshoot time
< 35 ms
Reset time
< 35 ms
(1) In reference conditions (IEC 60255-6).
(2) Displays "rotation" instead of positive sequence voltage measurement.
3/5
3
Remanent undervoltage
ANSI code 27R
Protection functions
Operation
This protection is single-phase:
b it picks up when the U21 phase-to-phase voltage is less than the Us set point
b the protection includes a definite time delay.
MT10875
Block diagram
U21
(or V1)
U < Us
T
0
time-delayed output
“pick-up” signal
Characteristics
Us set point
3
Setting
5 % Unp to 100 % Unp
Accuracy (1)
±2 % or 0.005 Unp
Resolution
1%
Drop-out/pick-up ratio
103 % ±2.5 %
Time delay T
Setting
50 ms to 300 s
Accuracy (1)
±2 %, or ±25 ms
Resolution
10 ms or 1 digit
Characteristic times
Operation time
< 40 ms
Overshoot time
< 20 ms
Reset time
< 30 ms
(1) In reference conditions (IEC 60255-6).
3/6
Phase-to-neutral undervoltage
ANSI code 27S
Protection functions
Operation
This protection is three-phase:
b it picks up when one of the 3 phase-to-neutral voltages drops below the Vs set
point
b it has 3 independent outputs available for the control matrix
b it is operational if the number of VTs connected is V1, V2, V3 or U21, U32 with
measurement of V0.
MT10874
Block diagram
V1
V1 < Vs
V2
V2 < Vs
V3
V3 < Vs
T
0
T
0
T
0
1
time-delayed output
time-delayed output
time-delayed output
“pick-up” signal
Characteristics
Vs set point
Setting
5 % Vnp to 100 % Vnp
Accuracy (1)
±2 % or 0.005 Vnp
Resolution
1%
Drop-out/pick-up ratio
103 % ±2.5 %
Time delay T
Setting
50 ms to 300 s
Accuracy (1)
±2 %, or ±25 ms
Resolution
10 ms or 1 digit
Characteristic times
Operation time
pick-up < 35 ms (typically 25 ms)
Overshoot time
< 35 ms
Reset time
< 40 ms
(1) In reference conditions (IEC 60255-6).
3/7
3
Phase undercurrent
ANSI code 37
Operation
Block diagram
This protection is single-phase:
b it picks up when phase 1 current drops below the Is
set point
b it is inactive when the current is less than 10 % of Ib
b it is insensitive to current drops (breaking) due to
circuit breaker tripping
b it includes a definite time delay T.
MT10426
Is
I
MT10865
Operating principle
0.1 Ib
“pick-up”
signal
time-delayed
output
Case of current sag.
MT10866
15 ms 0
&
T
0
time-delayed
output”
“pick-up”
signal
I>
0.1 Ib
Operating time
Overshoot time
Reset time
(1) In reference conditions (IEC 60255-6).
1.06 Is
Is
1.06 Is
Is
0.1 Ib
“pick-up”
signal = 0
time-delayed
output = 0
Case of circuit breaker tripping.
3/8
I < Is
Is set point
Setting
Accuracy (1)
Pick-up/drop-out ratio
T time delay
Setting
Accuracy (1)
Resolution
Characteristic times
T
0 0,1 Ib
I1
Characteristics
t
3
DE50367
Protection functions
<15 ms
15 % Ib y Is y 100 % Ib by steps of 1 %
±5 %
106 % ±5 % for Is > 0.1 In
50 ms y T y 300 s
±2 % or ±25 ms
10 ms or 1 digit
< 50 ms
< 35 ms
< 40 ms
Protection functions
Negative sequence / unbalance
ANSI code 46
Operation
The tripping curve is defined according to the following equations:
b for Is/Ib y Ii/Ib y 0,.
The negative sequence / unbalance protection
function:
b picks up if the negative sequence component of
phase currents is greater than the operation set point
b it is time-delayed. The time delay may be definite
time or IDMT (see curve).
The negative sequence current is determined
according to the 3 phase currents.
2
Ii = 1
--- × ( I1 + a I2 + aI3 )
3
4,64
t = ----------------------.
T
0,96
( li/lb )
b for Ii/Ib > 5
t=T
j 2π
------3
If Sepam is connected to 2 phase current sensors only,
the negative sequence current is:
1
Ii = ------ × I1 – a 2 I3
3
with a = e
b for 0.5 y Ii/Ib y 5
j 2π
------3
Block diagram
3
I1
DE50557
with a = e
3,19
t = -------------------. T
1,5
( li/lb )
I2
T
Ii > Is
0
time-delayed
output
I3
“pick-up”
signal
Both formulas are equivalent when there is no zero
sequence current (earth fault).
Definite time protection
Is is the operation set point expressed in Amps, and T
is the protection operation time delay.
Characteristics
MT10550
t
Curve
Setting
Is set point
Setting
T
Is
Ii
Definite time
IDMT
Resolution
Accuracy (1)
Time delay T (operation time at 5 Ib)
Setting
Definite time
Definite time protection principle.
IDMT protection
For Ii > Is, the time delay depends on the value of Ii/Ib
(Ib: basis current of the protected equipment defined
when the general parameters are set)
T corresponds to the time delay for Ii/Ib = 5
Definite, IDMT
IDMT
Resolution
Accuracy (1)
Definite time
IDMT
Pick-up/drop-out ratio
Characteristic times
Operation time
Overshoot time
MT10857
Reset time
(1) In reference conditions (IEC 60255-6).
10 % Ib y Is y 500 % Ib
10 % Ib y Is y 50 % Ib
1%
±5 %
100 ms y T y 300 s
100 ms y T y 1 s
10 ms ou 1 digit
±2 % or ±25 ms
±5 % or ±35 ms
93.5 % ±5 %
pick-up < 55 ms
< 35 ms
< 55 ms
IDMT protection principle.
3/9
Negative sequence / unbalance
ANSI code 46
Protection functions
Use the table to find the value of K that corresponds to
the required negative sequence current. The tripping
time is equal to KT.
Example
given a tripping curve with the setting T = 0.5 s.
What is the tripping time at 0.6 Ib?
Use the table to find the value of K that corresponds to
60 % of Ib.
The table reads K = 7.55. The tripping time is equal to:
0.5 x 7.55 = 3.755 s.
IDMT tripping curve
t(s)
MT10546
Determination of tripping time for
different negative sequence current
values for a given curve
10000
5000
2000
1000
500
200
100
50
3
20
max. curve (T=1s)
10
5
2
1
0.5
0.2
0,1
min. curve (T=0,1s)
0.05
0.02
0.01
0.005
0.002
I/Ib
0.001
0.05
li (% lb)
K
0.2
0.3
0.5 0.7
1
2
3
5
7
10
20
15
54.50
20
35.44
25
25.38
30
19.32
33.33
16.51
35
15.34
40
12.56
45
10.53
50
9.00
55
8.21
57.7
7.84
60
7.55
65
7.00
70
6.52
75
6.11
li (% lb) cont’d 80
K cont’d
5.74
85
5.42
90
5.13
95
4.87
100
4.64
110
4.24
120
3.90
130
3.61
140
3.37
150
3.15
160
2.96
170
2.80
180
2.65
190
2.52
200
2.40
210
2.29
li (% lb) cont’d 22.
K cont’d
2.14
230
2.10
240
2.01
250
1.94
260
1.86
270
1.80
280
1.74
290
1.68
300
1.627
310
1.577
320
1.53
330
1.485
340
1.444
350
1.404
360
1.367
370
1.332
li (% lb) cont’d 380
K cont’d
1.298
390
1.267
400
1.236
410
1.18
420
1.167
430
1.154
440
1.13
450
1.105
460
1.082
470
1.06
480
1.04
490
1.02
u 500
1
3/10
10
99.95
0.1
Excessive starting time,
locked rotor
ANSI code 48/51LR
Protection functions
Operation
DE50558
This function is three-phase.
It comprises two parts:
b excessive starting time: during starting, the protection picks up when one of the
3 phase currents is greater than the set point Is for a longer period of time than the
ST time delay (normal starting time)
b locked rotor:
v at the normal operating rate (after starting), the protection picks up when one of
the 3 phase currents is greater than the set point Is for a longer period of time than
the LT time delay of the definite time type
v locked on start: large motors may have very long starting time, due to their inertia
or the reduce voltage supply. This starting time is longer than the permissive rotor
blocking time. To protect such a motor LTS timer initiate a trip if a start has been
detected (I > Is) or if the motor speed is zero. For a normal start, the input I23
(zero-speed-switch) disable this protection.
Case of normal starting.
DE50559
Motor re-acceleration
When the motor re-accelerates, it consumes a current in the vicinity of the starting
current (> Is) without the current first passing through a value less than 10 % of Ib.
The ST time delay, which corresponds to the normal starting time, may be
reinitialized by a logic data input for particular uses (input I22).
b reinitialize the excessive starting time protection
b set the locked rotor protection LT time delay to a low value.
Starting is detected when the current consumed is 10 % greater than the Ib current.
Block diagram
≥1
DE50560
MT10870
Case of excessive starting time.
I > 0.1Ib
I1
I2
I3
ST 0
&
R
LT
0
tripping
output
locked
rotor output
input I22
≥1
I > Is
&
starting
time output
&
locked rotor
at output
LTS 0
input I23
Case of locked rotor output.
DE50561
Characteristics
Is set point
Setting
Resolution
Accuracy (1)
Pick-up/drop-out ratio
ST, LT and LTS time delays
Setting
50 % Ib y Is y 500 % Ib
1%
±5 %
93.5 % ±5 %
ST
LT
LTS
Resolution
Accuracy (1)
500 ms y T y 300 s
50 ms y T y 300 s
50 ms y T y 300 s
10 ms ou 1 digit
±2 % ou ±25 ms
(1) In reference conditions (IEC 60255-6).
Case of starting locked rotor.
3/11
3
Protection functions
Thermal overload
ANSI code 49RMS
Description
For self-ventilated rotating machines, cooling is more effective when the machine is
running than when it is stopped. Running and stopping of the equipment are
calculated from the value of the current:
b running if I > 0.1 Ib
b stopped if I < 0.1 Ib.
Two time constants may be set:
b T1: heat rise time constant: concerns equipment that is running
b T2: cooling time constant: concerns equipment that is stopped.
This function is used to protect equipment (motors,
transformers, generators, lines, capacitors) against
overloads, based on measurement of the current
consumed.
Operation curve
The protection gives a trip order when the heat rise E,
calculated according to the measurement of an
equivalent current Ieq, is greater than the set point Es.
The greatest permissible continuous current is
I = Ib Es
The protection tripping time is set by the time
constant T.
b the calculated heat rise depends on the current
consumed and the previous heat rise state.
b the cold curve defines the protection tripping time
based on zero heat rise.
b the hot curve defines the protection tripping time
based on 100 % nominal heat rise.
3
MT10858
101
Cold curve
2
 leq
-
 -------lb 
t
--- = Ln ------------------------------2
T
 leq
- – Es
 -------lb
100
10-1
10-2
Hot curve
10-3
0
5
2
 leq
- – Es0
 -------lb 
t
modified cold curve: --- = Ln ----------------------------------2
T
 leq
- – Es
 -------lb 
b a second group of parameters (time constants and set points) is used to take into
account thermal withstand with locked rotors. This second set of parameters is taken
into account when the current is greater than an adjustable set point Is.
“Hot state” set point
When the function is used to protect a motor, this fixed
set point is designed for detection of the hot state used
by the number of starts function.
Heat rise and cooling time constants
MT10420
MT10419
1
Tmax – 40°C
Increase factor: fa = ----------------------------------------------------Tmax – Tambient
Adaptation of the protection to motor thermal withstand
Motor thermal protection is often set based on the hot and cold curves supplied by
the machine manufacturer. To fully comply with these experimental curves, additional
parameters must be set:
b initial heat rise, Es0, is used to reduce the cold tripping time.
2
Alarm set point, tripping set point
Two set points may be set for heat rise:
b Es1: alarm
b Es2: tripping.
E
Accounting for ambient temperature
Most machines are designed to operate at a maximum ambient temperature of
40 °C. The thermal overload function takes into account the ambient temperature
(Sepam equipped with the temperature sensor option (1)) to increase the calculated
heat rise value when the temperature measured exceeds 40 °C.
in which T max is the equipment’s maximum temperature
(according to insulation class)
T ambient is the measured temperature.
 leq
- – 1
 -------lb 
t
--- = Ln ------------------------------2
T
 leq
- – Es
 -------lb 
10
Accounting for harmonics
The current measured by the thermal protection is an RMS 3-phase current which
takes into account harmonics up to number 17.
Accounting for negative sequence current
In the case of motors with coiled rotors, the presence of a negative sequence
component increases the heat rise in the motor. The negative sequence component
of the current is taken into account in the protection by the equation
leq =
E
1
2
lph + K ⋅ li
2
in which Iph is the greatest phase current
Ii is the negative sequence component of
the current
K is an adjustable factor
0,63
0,36
0
K may have the following values: 0 - 2.25 - 4.5 - 9
For an asynchronous motor, K is determined as follows:
0
T1
Heat rise time constant.
t
T2
Cooling time constant.
t
1
K = 2 ⋅ Cd
-------- ⋅ ---------------------- – 1 in which Cn, Cd: rated torque and starting torque
Cn
ld 2

Ib, Id: basis current and starting current
g ⋅ -----
 lb
g: rated slip.
(1) MET148-2 module, RTC 8 predefined for ambient temperature measurement.
3/12
Protection functions
Thermal overload
ANSI code 49RMS
Start inhibit
The thermal overload protection can inhibit the closing
of the motor’s control device until the heat rise drops
back down below a value that allows restarting.
This value takes into account the heat rise produced by
the motor when starting.
The inhibition function is grouped together with the
starts per hour protection and the indication START
INHIBIT informs the user.
Characteristics
Saving of heat rise
When the protection trips, the current heat rise,
increased by 10 % (1), is saved. The saved value is reset
to zero when the heat rise decreases sufficiently for the
time before starting to be zero. The saved value is used
when the power returns after a Sepam power failure, so
as to start up again with the heat rise that triggered
tripping.
(1) Increasing by 10 % makes it possible to take into account the
average heat rise of motors when starting.
Inhibition of tripping
Tripping of the thermal overload protection may be
inhibited by logic input (according to parameter setting)
when required by the process.
Accounting for two operating rates
A power transformer often has two operating modes
(e.g. ONAN and ONAF).
The two groups of parameters in the thermal overload
protection take into account these two operating modes.
Switching from one mode to the other is controlled by a
logic input I26 (according to parameter setting).
It is done without losing the heat rise value.
Set points
Setting
Es1 alarm set point
Es2 tripping set point
Es0 initial heat rise
group A
50 % to 300 %
50 % to 300 %
0 to 100 %
1%
Resolution
Time constants
Setting
T1 running (heat rise)
1 mn to 120 mn
T2 stopped (cooling)
5 mn to 600 mn
Resolution
1 mn
Accounting for negative sequence component
Setting
K 0 – 2.25 – 4.5 – 9
Maximum equipment temperature (according to insulation class) (2)
Setting
T max 60° to 200°
Resolution
1°
Tripping time
Accuracy (1)
2%
Change of setting parameters
By current threshold for motor
Is set point
0.25 to 8 Ib
By digital input for transformer
Input
I26
(1) In reference conditions (IEC 60255-8).
(2) Equipment manufacturer data.
group B
50 % to 300 %
50 % to 300 %
0 to 100 %
1%
1 mn to 120 mn
5 mn to 600 mn
1 mn
3
User information
The following information is available for the user:
b time before restart enabled (in case of inhibition of
starting)
b time before tripping (with constant current)
b heat rise.
See chapter "Machine operation assistance functions".
DE50243
Block diagram
3/13
Thermal overload
ANSI code 49RMS
Protection functions
Setting examples
Example 1
The following data are available:
b time constants for on operation T1 and off operation
T2:
v T1 = 25 min
v T2 = 70 min
b maximum curve in steady state: Imax/Ib = 1.05.
Setting of tripping set point Es2
Es2 = (Imax/Ib)2 = 110 %
Please note: if the motor absorbs a current of 1.05 Ib in
steady state, the heat rise calculated by the thermal
overload protection will reach 110 %.
Setting of alarm set point Es1
Es1 = 90 % (I/Ib = 0.95).
Knegative: 4.5 (usual value)
The other thermal overload parameters do not need to
be set. They are not taken into account by default.
3
Example 2
The following data are available:
b motor thermal resistance in the form of hot and cold
curves (see solid line curves in Figure 1)
b cooling time constant T2
b maximum steady state current: Imax/Ib = 1.05.
Setting of tripping set point Es2
Es2 = (Imax/Ib)2 = 110 %
Setting of alarm set point Es1:
Es1 = 90 % (I/Ib = 0.95).
The manufacturer’s hot/cold curves (1) may be used to
determine the heating time constant T1.
The approach consists of placing the Sepam hot/cold
curves below the motor curves.
DE50368
Figure 1: motor thermal resistance and thermal
overload tripping curves
motor cold curve
time before tripping / s
Sepam hot curve
70
3/14
2
Setting of tripping set point Es2
Es2 = (Imax/Ib)2 = 120 %
Setting of alarm set point Es1
Es1 = 90 % (I/Ib = 0.95).
The time constant T1 is calculated so that the thermal overload protection trips after
100 s (point 1).
With t/T1 = 0.069 (I/Ib = 2 and Es2 = 120 %):
⇒ T1 = 100 s / 0.069 = 1449 sec ≈ 24 min.
The tripping time starting from the cold state is equal to:
t/T1 = 0.3567 ⇒ t = 24 min 0.3567 = 513 s (point 2’).
This tripping time is too long since the limit for this overload current is 400 s (point 2).
If the time constant T1 is lowered, the thermal overload protection will trip earlier,
below point 2.
There risk that motor starting when hot will not be possible also exists in this case
(see Figure 2 in which a lower Sepam hot curve would intersect the starting curve
with U = 0.9 Un).
The Es0 parameter is a setting that is used to solve these differences by lowering
the Sepam cold curve without moving the hot curve.
In this example, the thermal overload protection should trip after 400 s starting from
the cold state.
The following equation is used to obtain the Es0 value:
t ne ces sary
2 ---------------------2
T1
l
processed
processed – Es2
Es0 = ------------------. l------------------- –e
lb
l
(1) When the machine manufacturer provides both a time constant T1 and the machine hot/cold
curves, the use of the curves is recommended since they are more accurate.
(2) The charts containing the numerical values of the Sepam hot curve may be used, or else
the equation of the curve which is given on page 10.
1
1.05
The following data are available:
b motor thermal resistance in the form of hot and cold curves (see solid line curves
in Figure 1),
b cooling time constant T2
b maximum steady state current: Imax/Ib = 1.1.
with:
t necessary : tripping time necessary starting from a cold state.
I processed : equipment current.
motor hot curve
2
Example 3
b
Sepam cold curve
665
For an overload of 2 Ib, the value t/T1 = 0.0339 (2) is obtained.
In order for Sepam to trip at the point 1 (t = 70 s), T1 is equal to 2065 sec ≈ 34 min.
With a setting of T1 = 34 min, the tripping time is obtained based on a cold state
(point 2). In this case, it is equal to t/T1 = 0.3216 ⇒ t ⇒ 665 sec, i.e. ≈ 11 min,
which is compatible with the thermal resistance of the motor when cold.
The negative sequence factor is calculated using the equation defined on page 10.
The parameters of the second thermal overload relay do not need to be set.
They are not taken into account by default.
I/Ib
Thermal overload
ANSI code 49RMS
Protection functions
Setting examples
Use of the additional setting group
When a motor rotor is locked or is turning very slowly, its thermal behavior is different
from that with the rated load. In such conditions, the motor is damaged by
overheating of the rotor or stator. For high power motors, rotor overheating is most
often a limiting factor.
The thermal overload parameters chosen for operation with a low overload are no
longer valid.
In order to protect the motor in this case, “excessive starting time” protection may be
used.
Nevertheless, motor manufacturers provide the thermal resistance curves when the
rotor is locked, for different voltages at the time of starting.
In numerical values, the following is obtained:
Es0 = 4 – e
400 sec
--------------------------24∗ 60sec
= 0.3035 ≈ 31%
By setting Es0 = 31 %, point 2’ is moved downward to
obtain a shorter tripping time that is compatible with the
motor’s thermal resistance when cold (see Figure 3).
Please note: A setting Es0 = 100 % therefore means
that the hot and cold curves are the same.
Figure 2: hot/cold curves not compatible with the
motor’s thermal resistance
Figure 4: Locked rotor thermal resistance
513
400
2’
2
100
MT10863
motor cold curve
locked rotor
motor running
3
motor hot curve
times / s
time before tripping / s
DE50369
Sepam cold curve
Sepam hot curve
1
1
3
2
starting at Un
starting at 0.9 Un
1.05
I/Ib
2
4
1.1
DE50370
time before tripping / s
adjusted Sepam
cold curve
100
motor hot curve
1
Sepam hot curve
6
I/Ib
In order to take these curves into account, the second thermal overload relay may be
used.
The time constant in this case is, in theory, the shortest one: however, it should not
be determined in the same way as that of the first relay.
The thermal overload protection switches between the first and second relay if the
equivalent current Ieq exceeds the Is value (set point current).
motor cold curve
2
5
Is
➀: thermal resistance, motor running
➁: thermal resistance, motor stopped
➂: Sepam tripping curve
➃: starting at 65 % Un
➄: starting at 80 % Un
➅: starting at 100 % Un
Figure 3: hot/cold curves compatible with the
motor’s thermal resistance via the setting of an
initial heat rise Es0
400
2
starting at Un
starting at 0.9 Un
1.1
2
I/Ib
3/15
Thermal overload
ANSI code 49RMS
Protection functions
Setting examples
Cold curves for Es0 = 0
l/Ib
Es (%)
3
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
3/16
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
0.6931
0.7985
0.9163
1.0498
1.2040
1.3863
1.6094
1.8971
2.3026
0.6042
0.6909
0.7857
0.8905
1.0076
1.1403
1.2933
1.4739
1.6946
1.9782
2.3755
3.0445
0.5331
0.6061
0.6849
0.7704
0.8640
0.9671
1.0822
1.2123
1.3618
1.5377
1.7513
2.0232
2.3979
3.0040
0.4749
0.5376
0.6046
0.6763
0.7535
0.8373
0.9287
1.0292
1.1411
1.2670
1.4112
1.5796
1.7824
2.0369
2.3792
2.9037
0.4265
0.4812
0.5390
0.6004
0.6657
0.7357
0.8109
0.8923
0.9808
1.0780
1.1856
1.3063
1.4435
1.6025
1.7918
2.0254
2.3308
2.7726
0.3857
0.4339
0.4845
0.5379
0.5942
0.6539
0.7174
0.7853
0.8580
0,9365
1.0217
1.1147
1.2174
1.3318
1.4610
1.6094
1.7838
1.9951
2.2634
2.6311
3.2189
0.3508
0.3937
0.4386
0.4855
0.5348
0.5866
0.6413
0.6991
0.7605
0.8258
0.8958
0.9710
1.0524
1.1409
1.2381
1.3457
1.4663
1.6035
1.7626
1.9518
2.1855
2.4908
2.9327
0.3207
0.3592
0.3993
0.4411
0.4847
0.5302
0.5780
0.6281
0.6809
0.7366
0.7956
0.8583
0.9252
0,9970
1.0742
1.1580
1.2493
1.3499
1.4618
1.5877
1.7319
1.9003
2.1030
2.3576
2.6999
3.2244
0.2945
0.3294
0.3655
0.4029
0.4418
0.4823
0.5245
0.5686
0.6147
0.6630
0.7138
0.7673
0.8238
0.8837
0.9474
1.0154
1.0885
1.1672
1.2528
1.3463
1.4495
1.5645
1.6946
1.8441
2.0200
2.2336
2.5055
2.8802
3.4864
0.2716
0.3033
0.3360
0.3698
0.4049
0.4412
0.4788
0.5180
0.5587
0.6012
0.6455
0.6920
0.7406
0.7918
0.8457
0.9027
0.9632
1.0275
1.0962
1.1701
1.2498
1.3364
1.4313
1.5361
1.6532
1.7858
1.9388
2.1195
2.3401
2.6237
3.0210
0.2513
0.2803
0.3102
0.3409
0.3727
0.4055
0.4394
0.4745
0.5108
0.5486
0.5878
0.6286
0.6712
0.7156
0.7621
0.8109
0.8622
0.9163
0.9734
1.0341
1.0986
1.1676
1.2417
1.3218
1.4088
1.5041
1.6094
1.7272
1.8608
2.0149
2.1972
0.2333
0.2600
0.2873
0.3155
0.3444
0.3742
0.4049
0.4366
0.4694
0.5032
0.5383
0.5746
0.6122
0.6514
0.6921
0.7346
0.7789
0.8253
0.8740
0.9252
0.9791
1.0361
1.0965
1.1609
1.2296
1.3035
1.3832
1.4698
1.5647
1.6695
1.7866
0.2173
0.2419
0.2671
0.2929
0.3194
0.3467
0.3747
0.4035
0.4332
0.4638
0.4953
0.5279
0.5616
0.5964
0.6325
0.6700
0.7089
0.7494
0.7916
0.8356
0.8817
0.9301
0.9808
1.0343
1.0908
1.1507
1.2144
1.2825
1.3555
1.4343
1.5198
0.2029
0.2257
0.2490
0.2728
0.2972
0.3222
0.3479
0.3743
0.4013
0.4292
0.4578
0,4872
0.5176
0.5489
0.5812
0.6146
0.6491
0.6849
0.7220
0.7606
0.8007
0.8424
0.8860
0.9316
0.9793
1.0294
1.0822
1.1379
1.1970
1.2597
1.3266
0.1900
0.2111
0.2327
0.2548
0.2774
0.3005
0.3241
0.3483
0.3731
0.3986
0.4247
0,4515
0.4790
0.5074
0.5365
0.5666
0.5975
0.6295
0.6625
0.6966
0.7320
0.7686
0.8066
0.8461
0.8873
0.9302
0.9751
1.0220
1.0713
1.1231
1.1778
0.1782
0.1980
0.2181
0.2386
0.2595
0.2809
0.3028
0.3251
0.3480
0.3714
0.3953
0,4199
0.4450
0.4708
0.4973
0.5245
0.5525
0.5813
0.6109
0.6414
0.6729
0.7055
0.7391
0.7739
0.8099
0.8473
0.8861
0.9265
0.9687
1.0126
1.0586
0.1676
0.1860
0.2048
0.2239
0.2434
0.2633
0.2836
0.3043
0.3254
0.3470
0.3691
0,3917
0.4148
0.4384
0.4626
0.4874
0.5129
0.5390
0.5658
0.5934
0.6217
0.6508
0.6809
0.7118
0.7438
0.7768
0.8109
0.8463
0.8829
0.9209
0.9605
Thermal overload
ANSI code 49RMS
Protection functions
Setting examples
Cold curves for Es0 = 0
I/Ib
Es (%)
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
1.85
1.90
1.95
2.00
2.20
2.40
2.60
2.80
3.00
3.20
3.40
3.60
3.80
4.00
4.20
4.40
4.60
0.1579
0.1752
0.1927
0.2106
0.2288
0.2474
0.2662
0.2855
0.3051
0.3251
0.3456
0.3664
0.3877
0.4095
0.4317
0.4545
0.4778
0.5016
0.5260
0.5511
0.5767
0.6031
0.6302
0.6580
0.6866
0.7161
0.7464
0.7777
0.8100
0.8434
0.8780
0.1491
0.1653
0.1818
0.1985
0.2156
0.2329
0.2505
0.2685
0.2868
0.3054
0.3244
0.3437
0.3634
0.3835
0.4041
0.4250
0.4465
0.4683
0.4907
0.5136
0.5370
0.5610
0.5856
0.6108
0.6366
0.6631
0.6904
0.7184
0.7472
0.7769
0.8075
0.1410
0.1562
0.1717
0.1875
0.2035
0.2197
0.2362
0.2530
0.2701
0.2875
0.3051
0.3231
0.3415
0.3602
0.3792
0.3986
0.4184
0.4386
0.4591
0.4802
0.5017
0.5236
0.5461
0.5690
0.5925
0.6166
0.6413
0.6665
0.6925
0.7191
0.7465
0.1335
0.1479
0.1625
0.1773
0.1924
0.2076
0.2231
0.2389
0.2549
0.2712
0.2877
0.3045
0.3216
0.3390
0.3567
0.3747
0.3930
0.4117
0.4308
0.4502
0.4700
0.4902
0.5108
0.5319
0.5534
0.5754
0.5978
0.6208
0.6444
0.6685
0.6931
0.1090
0.1206
0.1324
0.1442
0.1562
0.1684
0.1807
0.1931
0.2057
0.2185
0.2314
0.2445
0.2578
0.2713
0.2849
0.2988
0.3128
0.3270
0.3414
0.3561
0.3709
0.3860
0.4013
0.4169
0.4327
0.4487
0.4651
0.4816
0.4985
0.5157
0.5331
0.0908
0.1004
0.1100
0.1197
0.1296
0.1395
0.1495
0.1597
0.1699
0.1802
0.1907
0.2012
0.2119
0.2227
0.2336
0.2446
0.2558
0.2671
0.2785
0.2900
0.3017
0.3135
0.3254
0.3375
0.3498
0.3621
0.3747
0.3874
0.4003
0.4133
0.4265
0.0768
0.0849
0.0929
0.1011
0.1093
0.1176
0.1260
0.1344
0.1429
0.1514
0.1601
0.1688
0.1776
0.1865
0.1954
0.2045
0.2136
0.2228
0.2321
0.2414
0.2509
0.2604
0.2701
0.2798
0.2897
0.2996
0.3096
0.3197
0.3300
0.3403
0.3508
0.0659
0.0727
0.0796
0.0865
0.0935
0.1006
0.1076
0.1148
0.1219
0.1292
0.1365
0.1438
0.1512
0.1586
0.1661
0.1737
0.1813
0.1890
0.1967
0.2045
0.2124
0.2203
0.2283
0.2363
0.2444
0.2526
0.2608
0.2691
0.2775
0.2860
0.2945
0.0572
0.0631
0.069
0.075
0.081
0.087
0.0931
0.0992
0.1054
0.1116
0.1178
0.1241
0.1304
0.1367
0.1431
0.1495
0.156
0.1625
0.1691
0.1757
0.1823
0.189
0.1957
0.2025
0.2094
0.2162
0.2231
0.2301
0.2371
0.2442
0.2513
0.0501
0.0552
0.0604
0.0656
0.0708
0.0761
0.0813
0.0867
0.092
0.0974
0.1028
0.1082
0.1136
0.1191
0.1246
0.1302
0.1358
0.1414
0.147
0.1527
0.1584
0.1641
0.1699
0.1757
0.1815
0.1874
0.1933
0.1993
0.2052
0.2113
0.2173
0.0442
0.0487
0.0533
0.0579
0.0625
0.0671
0.0717
0.0764
0.0811
0.0858
0.0905
0.0952
0.1000
0.1048
0.1096
0.1144
0.1193
0.1242
0.1291
0.1340
0.1390
0.1440
0.1490
0.1540
0.1591
0.1641
0.1693
0.1744
0.1796
0.1847
0.1900
0.0393
0.0434
0.0474
0.0515
0.0555
0.0596
0.0637
0.0678
0.0720
0.0761
0.0803
0.0845
0.0887
0.0929
0.0972
0.1014
0.1057
0.1100
0.1143
0.1187
0.1230
0.1274
0.1318
0.1362
0.1406
0.1451
0.1495
0.1540
0.1585
0.1631
0.1676
0.0352
0.0388
0.0424
0.0461
0.0497
0.0533
0.0570
0.0607
0.0644
0.0681
0.0718
0.0755
0.0792
0.0830
0.0868
0.0905
0.0943
0.0982
0.1020
0.1058
0.1097
0.1136
0.1174
0.1213
0.1253
0.1292
0.1331
0.1371
0.1411
0.1451
0.1491
0.0317
0.0350
0.0382
0.0415
0.0447
0.0480
0.0513
0.0546
0.0579
0.0612
0.0645
0.0679
0.0712
0.0746
0.0780
0.0813
0.0847
0.0881
0.0916
0.0950
0.0984
0.1019
0.1054
0.1088
0.1123
0.1158
0.1193
0.1229
0.1264
0.1300
0.1335
0.0288
0.0317
0.0346
0.0375
0.0405
0.0434
0.0464
0.0494
0.0524
0.0554
0.0584
0.0614
0.0644
0.0674
0.0705
0.0735
0.0766
0.0796
0.0827
0.0858
0.0889
0.0920
0.0951
0.0982
0.1013
0.1045
0.1076
0.1108
0.1140
0.1171
0.1203
0.0262
0.0288
0.0315
0.0342
0.0368
0.0395
0.0422
0.0449
0.0476
0.0503
0.0530
0.0558
0.0585
0.0612
0.0640
0.0667
0.0695
0.0723
0.0751
0.0778
0.0806
0.0834
0.0863
0.0891
0.0919
0.0947
0.0976
0.1004
0.1033
0.1062
0.1090
0.0239
0.0263
0.0288
0.0312
0.0336
0.0361
0.0385
0.0410
0.0435
0.0459
0.0484
0.0509
0.0534
0.0559
0.0584
0.0609
0.0634
0.0659
0.0685
0.0710
0.0735
0.0761
0.0786
0.0812
0.0838
0.0863
0.0889
0.0915
0.0941
0.0967
0.0993
3/17
3
Thermal overload
ANSI code 49RMS
Protection functions
Setting examples
Cold curves for Es0 = 0
3
I/Ib
Es (%)
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
3/18
4.80
5.00
5.50
6.00
6.50
7.00
7.50
8.00
8.50
9.00
9.50
10.00
12.50
15.00
17.50
20.00
0.0219
0.0242
0.0264
0.0286
0.0309
0.0331
0.0353
0.0376
0.0398
0.0421
0.0444
0.0466
0.0489
0.0512
0.0535
0.0558
0.0581
0.0604
0.0627
0.0650
0.0673
0.0696
0.0720
0.0743
0.0766
0.0790
0.0813
0.0837
0.0861
0.0884
0.0908
0.0202
0.0222
0.0243
0.0263
0.0284
0.0305
0.0325
0.0346
0.0367
0.0387
0.0408
0.0429
0.0450
0.0471
0.0492
0.0513
0.0534
0.0555
0.0576
0.0598
0.0619
0.0640
0.0661
0.0683
0.0704
0.0726
0.0747
0.0769
0.0790
0.0812
0.0834
0.0167
0.0183
0.0200
0.0217
0.0234
0.0251
0.0268
0.0285
0.0302
0.0319
0.0336
0.0353
0.0370
0.0388
0.0405
0.0422
0.0439
0.0457
0.0474
0.0491
0.0509
0.0526
0.0543
0.0561
0.0578
0.0596
0.0613
0.0631
0.0649
0.0666
0.0684
0.0140
0.0154
0.0168
0.0182
0.0196
0.0211
0.0225
0.0239
0.0253
0.0267
0.0282
0.0296
0.0310
0.0325
0.0339
0.0353
0.0368
0.0382
0.0397
0.0411
0.0426
0.0440
0.0455
0.0469
0.0484
0.0498
0.0513
0.0528
0.0542
0.0557
0.0572
0.0119
0.0131
0.0143
0.0155
0.0167
0.0179
0.0191
0.0203
0.0215
0.0227
0.0240
0.0252
0.0264
0.0276
0.0288
0.0300
0.0313
0.0325
0.0337
0.0349
0.0361
0.0374
0.0386
0.0398
0.0411
0.0423
0.0435
0.0448
0.0460
0.0473
0.0485
0.0103
0.0113
0.0123
0.0134
0.0144
0.0154
0.0165
0.0175
0.0185
0.0196
0.0206
0.0217
0.0227
0.0237
0.0248
0.0258
0.0269
0.0279
0.0290
0.0300
0.0311
0.0321
0.0332
0.0343
0.0353
0.0364
0.0374
0.0385
0.0395
0.0406
0.0417
0.0089
0.0098
0.0107
0.0116
0.0125
0.0134
0.0143
0.0152
0.0161
0.0170
0.0179
0.0188
0.0197
0.0207
0.0216
0.0225
0.0234
0.0243
0.0252
0.0261
0.0270
0.0279
0.0289
0.0298
0.0307
0.0316
0.0325
0.0334
0.0344
0.0353
0.0362
0.0078
0.0086
0.0094
0.0102
0.0110
0.0118
0.0126
0.0134
0.0142
0.0150
0.0157
0.0165
0.0173
0.0181
0.0189
0.0197
0.0205
0.0213
0.0221
0.0229
0.0237
0.0245
0.0253
0.0261
0.0269
0.0277
0.0285
0.0293
0.0301
0.0309
0.0317
0.0069
0.0076
0.0083
0.0090
0.0097
0.0104
0.0111
0.0118
0.0125
0.0132
0.0139
0.0146
0.0153
0.0160
0.0167
0.0175
0.0182
0.0189
0.0196
0.0203
0.0210
0.0217
0.0224
0.0231
0.0238
0.0245
0.0252
0.0259
0.0266
0.0274
0.0281
0.0062
0.0068
0.0074
0.0081
0.0087
0.0093
0.0099
0.0105
0.0112
0.0118
0.0124
0.0130
0.0137
0.0143
0.0149
0.0156
0.0162
0.0168
0.0174
0.0181
0.0187
0.0193
0.0200
0.0206
0.0212
0.0218
0.0225
0.0231
0.0237
0.0244
0.0250
0.0056
0.0061
0.0067
0.0072
0.0078
0.0083
0.0089
0.0095
0.0100
0.0106
0.0111
0.0117
0.0123
0.0128
0.0134
0.0139
0.0145
0.0151
0.0156
0.0162
0.0168
0.0173
0.0179
0.0185
0.0190
0.0196
0.0201
0.0207
0.0213
0.0218
0.0224
0.0050
0.0055
0.0060
0.0065
0.0070
0.0075
0.0080
0.0085
0.0090
0.0095
0.0101
0.0106
0.0111
0.0116
0.0121
0.0126
0.0131
0.0136
0.0141
0.0146
0.0151
0.0156
0.0161
0.0166
0.0171
0.0177
0.0182
0.0187
0.0192
0.0197
0.0202
0.0032
0.0035
0.0038
0.0042
0.0045
0.0048
0.0051
0.0055
0.0058
0.0061
0.0064
0.0067
0.0071
0.0074
0.0077
0.0080
0.0084
0.0087
0.0090
0.0093
0.0096
0.0100
0.0103
0.0106
0.0109
0.0113
0.0116
0.0119
0.0122
0.0126
0.0129
0.0022
0.0024
0.0027
0.0029
0.0031
0.0033
0.0036
0.0038
0.0040
0.0042
0.0045
0.0047
0.0049
0.0051
0.0053
0.0056
0.0058
0.0060
0.0062
0.0065
0.0067
0.0069
0.0071
0.0074
0.0076
0.0078
0.0080
0.0083
0.0085
0.0087
0.0089
0.0016
0.0018
0.0020
0.0021
0.0023
0.0025
0.0026
0.0028
0.0029
0.0031
0.0033
0.0034
0.0036
0.0038
0.0039
0.0041
0.0043
0.0044
0.0046
0.0047
0.0049
0.0051
0.0052
0.0054
0.0056
0.0057
0.0059
0.0061
0.0062
0.0064
0.0066
0.0013
0.0014
0.0015
0.0016
0.0018
0.0019
0.0020
0.0021
0.0023
0.0024
0.0025
0.0026
0.0028
0.0029
0.0030
0.0031
0.0033
0.0034
0.0035
0.0036
0.0038
0.0039
0.0040
0.0041
0.0043
0.0044
0.0045
0.0046
0.0048
0.0049
0.0050
Thermal overload
ANSI code 49RMS
Protection functions
Setting examples
Hot curves for Es0 = 0
I/Ib
1.00
Es (%)
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
1.05
1.10
1.15
I/Ib
Es (%)
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
1.85
1.90
1.95
2.00
2.20
0.0209
0.0422
0.0639
0.0862
0.1089
0.1322
0.1560
0.1805
0.2055
0.2312
0.2575
0.2846
0.3124
0.3410
0.3705
0.4008
0.4321
0.4644
0.4978
0.5324
0.0193
0.0391
0.0592
0.0797
0.1007
0.1221
0.1440
0.1664
0.1892
0.2127
0.2366
0.2612
0.2864
0.3122
0.3388
0.3660
0.3940
0.4229
0.4525
0.4831
0.0180
0.0363
0.0550
0.0740
0.0934
0.1132
0.1334
0.1540
0.1750
0.1965
0.2185
0.2409
0.2639
0.2874
0.3115
0.3361
0.3614
0.3873
0.4140
0.4413
0.0168
0.0339
0.0513
0.0690
0.0870
0.1054
0.1241
0.1431
0.1625
0.1823
0.2025
0.2231
0.2442
0.2657
0.2877
0.3102
0.3331
0.3567
0.3808
0.4055
0.0131
0.0264
0.0398
0.0535
0.0673
0.0813
0.0956
0.1100
0.1246
0.1395
0.1546
0.1699
0.1855
0.2012
0.2173
0.2336
0.2502
0.2671
0.2842
0.3017
0.6690 0.2719 0.1685
3.7136 0.6466 0.3712
1.2528 0.6257
3.0445 0.9680
1.4925
2.6626
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
0.1206
0.2578
0.4169
0.6061
0.8398
1.1451
1.5870
2.3979
0.0931
0.1957
0.3102
0.4394
0.5878
0.7621
0.9734
1.2417
1.6094
2.1972
3.8067
0.0752
0.1566
0.2451
0.3423
0.4499
0.5705
0.7077
0.8668
1.0561
1.2897
1.5950
2.0369
2.8478
0.0627
0.1296
0.2013
0.2786
0.3623
0.4537
0.5543
0.6662
0.7921
0.9362
1.1047
1.3074
1.5620
1.9042
2.4288
3.5988
0.0535
0.1100
0.1699
0.2336
0.3017
0.3747
0.4535
0.5390
0.6325
0.7357
0.8508
0.9808
1.1304
1.3063
1.5198
1.7918
2.1665
2.7726
4.5643
0.0464
0.0951
0.1462
0.2002
0.2572
0.3176
0.3819
0.4507
0.5245
0.6042
0.6909
0.7857
0.8905
1.0076
1.1403
1.2933
1.4739
1.6946
1.9782
2.3755
0.0408
0.0834
0.1278
0.1744
0.2231
0.2744
0.3285
0.3857
0.4463
0.5108
0.5798
0.6539
0.7340
0.8210
0.9163
1.0217
1.1394
1.2730
1.4271
1.6094
0.0363
0.0740
0.1131
0.1539
0.1963
0.2407
0.2871
0.3358
0.3869
0.4408
0.4978
0.5583
0.6226
0.6914
0.7652
0.8449
0.9316
1.0264
1.1312
1.2483
0.0326
0.0662
0.1011
0.1372
0.1747
0.2136
0.2541
0.2963
0.3403
0.3864
0.4347
0.4855
0.5390
0.5955
0.6554
0.7191
0.7872
0.8602
0.9390
1.0245
0.0295
0.0598
0.0911
0.1234
0.1568
0.1914
0.2271
0.2643
0.3028
0.3429
0.3846
0.4282
0.4738
0.5215
0.5717
0.6244
0.6802
0.7392
0.8019
0.8688
0.0268
0.0544
0.0827
0.1118
0.1419
0.1728
0.2048
0.2378
0.2719
0.3073
0.3439
0.3819
0.4215
0.4626
0.5055
0.5504
0.5974
0.6466
0.6985
0.7531
0.0245
0.0497
0.0755
0.1020
0.1292
0.1572
0.1860
0.2156
0.2461
0.2776
0.3102
0.3438
0.3786
0.4146
0.4520
0.4908
0.5312
0.5733
0.6173
0.6633
0.0226
0.0457
0.0693
0.0935
0.1183
0.1438
0.1699
0.1967
0.2243
0.2526
0.2817
0.3118
0.3427
0.3747
0.4077
0.4418
0.4772
0.5138
0.5518
0.5914
2.40
2.60
2.80
3.00
3,20
3,40
3.60
3.80
4.00
4.20
4.40
4.60
0.0106
0.0212
0.0320
0.0429
0.0540
0.0651
0.0764
0.0878
0.0993
0.1110
0.1228
0.1347
0.1468
0.1591
0.1715
0.1840
0.1967
0.2096
0.2226
0.2358
0.0087
0.0175
0.0264
0.0353
0.0444
0.0535
0.0627
0.0720
0.0813
0.0908
0.1004
0.1100
0.1197
0.1296
0.1395
0.1495
0.1597
0.1699
0.1802
0.1907
0.0073
0.0147
0.0222
0.0297
0.0372
0.0449
0.0525
0.0603
0.0681
0.0759
0.0838
0.0918
0.0999
0.1080
0.1161
0.1244
0.1327
0.1411
0.1495
0.1581
0.0063
0.0126
0.0189
0.0253
0.0317
0.0382
0.0447
0.0513
0.0579
0.0645
0.0712
0.0780
0.0847
0.0916
0.0984
0.1054
0.1123
0.1193
0.1264
0.1335
0.0054
0.0109
0.0164
0.0219
0.0274
0.0330
0.0386
0.0443
0.0499
0.0556
0.0614
0.0671
0.0729
0.0788
0.0847
0.0906
0.0965
0.1025
0.1085
0.1145
0.0047
0.0095
0.0143
0.0191
0.0240
0.0288
0.0337
0.0386
0.0435
0.0485
0.0535
0.0585
0.0635
0.0686
0.0737
0.0788
0.0839
0.0891
0.0943
0.0995
0.0042
0.0084
0.0126
0.0169
0.0211
0.0254
0.0297
0.0340
0.0384
0.0427
0.0471
0.0515
0.0559
0.0603
0.0648
0.0692
0.0737
0.0782
0.0828
0.0873
0.0037
0.0075
0.0112
0.0150
0.0188
0.0226
0.0264
0.0302
0.0341
0.0379
0.0418
0.0457
0.0496
0.0535
0.0574
0.0614
0.0653
0.0693
0.0733
0.0773
0.0033
0.0067
0.0101
0.0134
0.0168
0.0202
0.0236
0.0270
0.0305
0.0339
0.0374
0.0408
0.0443
0.0478
0.0513
0.0548
0.0583
0.0619
0.0654
0.0690
0.0030
0.0060
0.0091
0.0121
0.0151
0.0182
0.0213
0.0243
0.0274
0.0305
0.0336
0.0367
0.0398
0.0430
0.0461
0.0493
0.0524
0.0556
0.0588
0.0620
0.0027
0.0055
0.0082
0.0110
0.0137
0.0165
0.0192
0.0220
0.0248
0.0276
0.0304
0.0332
0.0360
0.0389
0.0417
0.0446
0.0474
0.0503
0.0531
0.0560
0.0025
0.0050
0.0075
0.0100
0.0125
0.0150
0.0175
0.0200
0.0226
0.0251
0.0277
0.0302
0.0328
0.0353
0.0379
0.0405
0.0431
0.0457
0.0483
0.0509
3/19
3
Thermal overload
ANSI code 49RMS
Protection functions
Setting examples
Hot curves for Es0 = 0
3
I/Ib
Es (%)
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
3/20
4.80
5.00
5.50
6.00
6.50
7.00
7.50
8.00
8.50
9.00
9.50
10.00
12.50
15.00
17.50
20.00
0.0023
0.0045
0.0068
0.0091
0.0114
0.0137
0.0160
0.0183
0.0206
0.0229
0.0253
0.0276
0.0299
0.0323
0.0346
0.0370
0.0393
0.0417
0.0441
0.0464
0.0021
0.0042
0.0063
0.0084
0.0105
0.0126
0.0147
0.0168
0.0189
0.0211
0.0232
0.0253
0.0275
0.0296
0.0317
0.0339
0.0361
0.0382
0.0404
0.0426
0.0017
0.0034
0.0051
0.0069
0.0086
0.0103
0.0120
0.0138
0.0155
0.0172
0.0190
0.0207
0.0225
0.0242
0.0260
0.0277
0.0295
0.0313
0.0330
0.0348
0.0014
0.0029
0.0043
0.0057
0.0072
0.0086
0.0101
0.0115
0.0129
0.0144
0.0158
0.0173
0.0187
0.0202
0.0217
0.0231
0.0246
0.0261
0.0275
0.0290
0.0012
0.0024
0.0036
0.0049
0.0061
0.0073
0.0085
0.0097
0.0110
0.0122
0.0134
0.0147
0.0159
0.0171
0.0183
0.0196
0.0208
0.0221
0.0233
0.0245
0.0010
0.0021
0.0031
0.0042
0.0052
0.0063
0.0073
0.0084
0.0094
0.0105
0.0115
0.0126
0.0136
0.0147
0.0157
0.0168
0.0179
0.0189
0.0200
0.0211
0.0009
0.0018
0.0027
0.0036
0.0045
0.0054
0.0064
0.0073
0.0082
0.0091
0.0100
0.0109
0.0118
0.0128
0.0137
0.0146
0.0155
0.0164
0.0173
0.0183
0.0008
0.0016
0.0024
0.0032
0.0040
0.0048
0.0056
0.0064
0.0072
0.0080
0.0088
0.0096
0.0104
0.0112
0.0120
0.0128
0.0136
0.0144
0.0152
0.0160
0.0007
0.0014
0.0021
0.0028
0.0035
0.0042
0.0049
0.0056
0.0063
0.0070
0.0077
0.0085
0.0092
0.0099
0.0106
0.0113
0.0120
0.0127
0.0134
0.0141
0.0006
0.0013
0.0019
0.0025
0.0031
0.0038
0.0044
0.0050
0.0056
0.0063
0.0069
0.0075
0.0082
0.0088
0.0094
0.0101
0.0107
0.0113
0.0119
0.0126
0.0006
0.0011
0.0017
0.0022
0.0028
0.0034
0.0039
0.0045
0.0051
0.0056
0.0062
0.0067
0.0073
0.0079
0.0084
0.0090
0.0096
0.0101
0.0107
0.0113
0.0005
0.0010
0.0015
0.0020
0.0025
0.0030
0.0035
0.0040
0.0046
0.0051
0.0056
0.0061
0.0066
0.0071
0.0076
0.0081
0.0086
0.0091
0.0096
0.0102
0.0003
0.0006
0.0010
0.0013
0.0016
0.0019
0.0023
0.0026
0.0029
0.0032
0.0035
0.0039
0.0042
0.0045
0.0048
0.0052
0.0055
0.0058
0.0061
0.0065
0.0002
0.0004
0.0007
0.0009
0.0011
0.0013
0.0016
0.0018
0.0020
0.0022
0.0025
0.0027
0.0029
0.0031
0.0034
0.0036
0.0038
0.0040
0.0043
0.0045
0.0002
0.0003
0.0005
0.0007
0.0008
0.0010
0.0011
0.0013
0.0015
0.0016
0.0018
0.0020
0.0021
0.0023
0.0025
0.0026
0.0028
0.0030
0.0031
0.0033
0.0001
0.0003
0.0004
0.0005
0.0006
0.0008
0.0009
0.0010
0.0011
0.0013
0.0014
0.0015
0.0016
0.0018
0.0019
0.0020
0.0021
0.0023
0.0024
0.0025
Temperature monitoring
ANSI code 49T/38
Protection functions
Operation
This protection is associated with an RTD of the Pt100 platinum (100 Ω at 0 °C) or
(nickel 100 Ω, nickel 120 Ω) type in accordance with the IEC 60751 and DIN 43760
standards.
b it picks up when the monitored temperature is greater than the Ts set point
b it has two independent set points:
v alarm set point
v tripping set point
b when the protection is activated, it detects whether the RTD is shorted or
disconnected:
v RTD shorting is detected if the measured temperature is less than -35 °C
(measurement displayed “****”)
v RTD disconnection is detected if the measured temperature is greater than
+205 °C (measurement displayed “-****”).
If an RTD fault is detected, the set point output relays are inhibited: the protection
outputs are set to zero.
The "RTD fault" item is also made available in the control matrix and an alarm
message is generated.
Block diagram
MT10878
T < +205 ˚C
&
RTD
T > -35 ˚C
&
T > Ts1
set point 1
T > Ts2
set point 2
RTD’s fault
Characteristics
Ts1 and Ts2 set points
°C
°F
Setting
0 °C to 180 °C
32 °F to 356 °F
Accuracy (1)
±1.5 °C
±2.7 °F
Resolution
1 °C
1 °F
Pick-up/drop-out difference
3 °C ±0.5 °
Characteristic times
Operation time
< 5 seconds
(1) See "connection of MET148-2 module" chapter for accuracy derating according to wiring
cross-section.
3/21
3
Protection functions
Phase overcurrent
ANSI code 50/51
Description
The Is setting is the vertical asymptote of the curve, and T is the operation time delay
for 10 Is.
The tripping time for I/Is values of less than 1.2 depends on the type of curve chosen.
The phase overcurrent function comprises
4 independant elements divided into two groups
of 2 elements called Group A and Group B respectively.
The use of the two groups may be chosen by
parameter setting:
b operation with Group A or Group B exclusively, with
switching from one group to the other dependent on the
state of logic input I13 exclusively, or by remote control
(TC3, TC4),
I13 = 0 group A
l13 = 1 group B
b operation with Group A and Group B active for 4-set
point operation,
b enabling/disabling of each group of 2 elements
(A, B).
3
Name of curve
Type
Standard inverse time (SIT)
Very inverse time (VIT or LTI)
Extremely inverse time (EIT)
Ultra inverse time (UIT)
RI curve
IEC standard inverse time SIT / A
IEC very inverse time VIT or LTI / B
IEC extremely inverse time EIT / C
IEEE moderately inverse (IEC / D)
IEEE very inverse (IEC / E)
IEEE extremely inverse (IEC / F)
IAC inverse
IAC very inverse
IAC extremely inverse
Operation
The phase overcurrent protection function is three-pole.
It picks up if one, two or three of the phase currents reach
the operation set point.
It is time-delayed. The time delay may be definite time
(DT) or IDMT according to the curves opposite.
1.2
1.2
1.2
1.2
1
1
1
1
1
1
1
1
1
1
The curve equations are given in the chapter entitled "IDMT protection functions".
Definite time protection
Is is the operation set point expressed in Amps, and T
is the protection operation time delay.
The function takes into account current variations during the time delay interval.
For currents with a very large amplitude, the protection function has a definite time
characteristic:
b if I > 20 Is, tripping time is the time that corresponds to 20 Is
b if I > 40 In, tripping time is the time that corresponds to 40 In.
(In: current transformer rated current defined when the general settings are made).
MT10533
t
Block diagram
DE50371
T
Is
Definite time protection principle.
I
Timer hold delay
IDMT protection
IDMT protection operates in accordance with the
IEC (60255-3), BS 142 and IEEE (C-37112) standards.
The function includes an adjustable timer hold delay T1:
b definite time (timer hold) for all the tripping curves.
MT10541
I > Is time-delayed output
MT10903
type 1
t
type 1.2
I > Is pick-up signal
tripping
T
T
value of internal
time delay
counter
1
1.2
10
20
I/Is
IDMT protection principle.
T1
T1
T1
3/22
Phase overcurrent
ANSI code 50/51
Protection functions
b IDMT for IEC, IEEE and IAC curves.
MT10527
I > Is time-delayed output
I > Is pick-up signal
tripping
T
value of internal
time delay
counter
3
T1
Characteristics
Tripping curve
Setting
Is set point
Setting
Definite time,
IDMT: chosen according to list on page 22
Definite time
IDMT
Resolution
Accuracy (1)
Drop out/pick-up ratio
Time delay T (operation time at 10 Is)
Setting
Definite time
IDMT
Resolution
Definite time
Accuracy (1)
IDMT
Timer hold delay T1
Definite time (timer hold)
IDMT (reset time) (3)
Characteristic times
Operation time
0.1 In y Is y 24 In expressed in Amps
0.1 In y Is y 2.4 In expressed in Amps
1 A or 1 digit
±5 %
93.5 % ±5 % (with min. reset variance of
0.015 In)
inst. 50 ms y T y 300 s
100 ms y T y 12.5 s or TMS (2)
10 ms or 1 digit
±2 % or from -10 ms to +25 ms
Class 5 or from -10 ms to +25 ms
0; 0.05 to 300 s
0.5 to 20 s
pick-up < 35 ms at 2 Is (typically 25 ms)
inst. < 50 ms at 2 Is (confirmed instantaneous)
(typically 35 ms)
< 35 ms
< 50 ms (for T1 = 0)
Overshoot time
Reset time
(1) In reference conditions (IEC 60255-6).
(2) Setting ranges in TMS (Time Multiplier Setting) mode
Inverse (SIT) and IEC SIT/A:
0.04 to 4.20
Very inverse (VIT) and IEC VIT/B:
0.07 to 8.33
Very inverse (LTI) and IEC LTI/B:
0.01 to 0.93
Ext inverse (EIT) and IEC EIT/C:
0.13 to 15.47
IEEE moderately inverse:
0.42 to 51.86
IEEE very inverse:
0.73 to 90.57
IEEE extremely inverse:
1.24 to 154.32
IAC inverse:
0.34 to 42.08
IAC very inverse:
0.61 to 75.75
IAC extremely inverse:
1.08 to 134.4
(3) Only for standardized tripping curves of the IEC, IEEE and IAC types.
3/23
Protection functions
Earth fault
ANSI code 50N/51N or 50G/51G
Description
The Is0 setting is the vertical asymptote of the curve, and T is the operation time
delay for 10 Is0.
The tripping time for I0/Is0 values of less than 1.2 depends on the type of curve
chosen.
The earth fault function comprises 4 independant
elements divided into two groups of 2 settings called
Group A and Group B respectively.
The use of the two elements may be chosen by
parameter setting:
b operation with Group A or Group B exclusively, with
switching from one group to the other dependent on the
state of logic input I13 exclusively, or by remote control
(TC3, TC4),
I13 = 0 group A
I13 = 1 group B
b operation with Group A and Group B active for 4-set
point operation
b enabling/disabling of each group of 2 elements
(A, B).
3
Name of curve
Type
Standard inverse time (SIT)
1.2
Very inverse time (VIT or LTI)
1.2
Extremely inverse time (EIT)
1.2
Ultra inverse time (UIT)
1.2
RI curve
1
IEC standard inverse time SIT / A
1
IEC very inverse time VIT or LTI / B
1
IEC extremely inverse time EIT / C
1
IEEE moderately inverse (IEC / D)
1
IEEE very inverse (IEC / E)
1
IEEE extremely inverse (IEC / F)
1
IAC inverse
1
IAC very inverse
1
IAC extremely inverse
1
The curve equations are given in the chapter entitled "IDMT protection functions".
Operation
The earth fault protection function is single-pole.
It picks up if the earth fault current reaches the
operation set point.
It is time-delayed. The time delay may be definite time
(DT) or IDMT according to the curves opposite.
The protection function includes harmonic 2 restraint
which provides greater stability when transformers are
energized (measurement of residual current by the sum
of the 3 phase CTs).
The restraint disables tripping, regardless of the
fundamental current.
The restraint may be inhibited by parameter setting.
DE50372
Block diagram
DE50244
Definite time protection
Is0 is the operation set point expressed in Amps, and T
is the protection operation time delay.
The function takes into account current variations during the time delay interval.
For currents with a very large amplitude, the protection function has a definite time
characteristic:
b if I0 > 20 Is0, tripping time is the time that corresponds to 20 Is0
b if I0 > 15 In0 (1), tripping time is the time that corresponds to 15 In0.
Timer hold delay
Definite time protection principle.
DE50246
IDMT protection
IDMT protection operates in accordance with the
IEC (60255-3), BS 142 and IEEE (C-37112) standards.
IDMT protection principle.
3/24
DE50247
The function includes an adjustable timer hold delay T1:
b definite time (timer hold) for all the tripping curves
Earth fault
ANSI code 50N/51N or 50G/51G
Protection functions
DE50248
b IDMT for IEC, IEEE and IAC curves.
3
Characteristics
Tripping curvet
Setting
(1) In0 = In if the sum of the three phase currents is used
for the measurement.
In0 = sensor rating if the measurement is taken by a CSH
core balance CT.
In0 = In of the CT at In/10 according to parameter setting
if the measurement is taken by a 1 A or 5 A current
transformer.
(2) In reference conditions (IEC 60255-6).
(3) Setting ranges in TMS (Time Multiplier Setting) mode
Inverse (SIT) and IECIEC SIT/A: 0.04 to 4.20
Very inverse (VIT) and IEC VIT/B: 0.07 to 8.33
Very inverse (LTI) and IEC LTI/B: 0.01 to 0.93
Ext inverse (EIT) and IEC EIT/C: 0.13 to 15.47
IEEE moderately inverse:
0.42 to 51.86
IEEE very inverse:
0.73 to 90.57
IEEE extremely inverse:
1.24 to 154.32
IAC inverse:
0.34 to 42.08
IAC very inverse:
0.61 to 75.75
IAC extremely inverse:
1.08 to 134.4
(4) Only for standardized tripping curves of the IEC, IEEE and
IAC types.
Is0 set point
Definite time setting
Sum of CTs (1)
With CSH sensor
2 A rating
20 A rating
CT + CSH30
Core balance CT
with ACE990
IDMT time setting
Sum of CTs (1)
With CSH sensor
2 A rating
20 A rating
CT + CSH30
Core balance CT
with ACE990
Resolution
Accuracy (2)
Drop out/pick-up ratio
Harmonic 2 restraint
Fixed threshold
Time delay T (operation time at 10 Is0)
Setting
Definite time
IDMT (3)
Resolution
Accuracy (2)
Definite time
IDMT
Timer hold delay T1
Definite time
(timer hold)
IDMT (4)
Characteristic times
Operation time
Overshoot time
Reset time
Definite time,
IDMT: chosen according to list page 6
0.1 In0 y Is0 y 15 In0 expressed in Amps
0.1 In0 y Is0 y 15 In0
0.2 A to 30 A
2 A to 300 A
0.1 In0 y Is0 y 15 In0 (min. 0.1 A)
0.1 In0 < Is0 < 15 In0
0.1 In0 y Is0 y In0 (1) expressed in Amps
0.1 In0 y Is0 y In0
0.2 A to 2 A
2 A to 20 A
0.1 In0 y Is0 y In0 (min. 0.1 A)
0.1 In0 y Is0 y In0
0.1 A or 1 digit
±5 %
93.5 % ±5 % for Is0 > 0.1 In0
17 %
inst. 50 ms y T y 300 s
100 ms y T y 12.5 s or TMS (3)
10 ms or 1 digit
±2 % or from -10 ms to +25 ms
class 5 or from -10 ms to +25 ms
0; 0.05 to 300 s
0.5 to 300 s
pick-up < 35 ms at 2 Is0 (typically 25 ms)
inst. < 50 ms at 2 Is0 (confirmed instantaneous)
(typically 35 ms)
< 35 ms
< 40 ms (for T1 = 0)
3/25
Phase-to-phase overvoltage
ANSI code 59
Protection functions
Operation
This protection is three-phase:
b it picks up when one of the phase-to-phase voltages concerned is greater than
the Us set point
b the protection includes a definite time delay.
MT10876
Block diagram
U21
U32
T
0
time-delayed output
U > Us
U13
“pick-up” signal
Characteristics
3
Us set point
Setting
50 % Unp to 150 % Unp (2)
Accuracy (1)
±2 % or 0.005 Unp
Resolution
1%
Drop-out/pick-up ratio
97 % ±1 %
Time delay T
Setting
50 ms to 300 s
Accuracy (1)
±2 %, or ±25 ms
Resolution
10 ms or 1 digit
Characteristic times
Operation time
pick-up < 35 ms (typically 25 ms)
Overshoot time
< 35 ms
Reset time
< 40 ms
(1) In reference conditions (IEC 60255-6).
(2) 135 % Unp with TP 230 V / 3.
3/26
Neutral voltage displacement
ANSI code 59N
Protection functions
Operation
The protection function picks up if the residual voltage V0 is above a Vs0 set point,
with V0 = V1 + V2 + V3 ,
b it includes a definite time delay T
b the residual voltage is either calculated from the 3 phase voltages or measured by
an external VT.
DE50249
Block diagram
3
Characteristics
Vs0 set point
Setting
Accuracy (1)
Resolution
Drop-out/pick-up ratio
Time delay T
Setting
Accuracy (1)
Resolution
Characteristic times
Operation time
Overshoot time
Reset time
(1) In reference conditions (IEC 60255-6).
(2) Vns0 is one of the general settings.
2 % Unp to 80 % Unp if Vns0 (2) = sum of 3Vs
2 % Unp to 80 % Unp if Vns0 (2) = Uns/3
5 % Unp to 80 % Unp if Vns0 (2) = Uns/3
±2 % or ±0.005 Unp
1%
97 % ±1 %
50 ms to 300 s
±2 %, or ±25 ms
10 ms or 1 digit
pick-up < 55 ms
< 35 ms
< 55 ms
3/27
Starts per hour
ANSI code 66
Protection functions
Operation
This function is three-phase.
It picks up when the number of starts reaches the following limits:
b maximum number of starts allowed per period of time (P) (Nt)
b maximum allowed number of consecutive hot starts (Nh)
b maximum allowed number of consecutive cold starts (Nc).
The function indicates:
b the number of starts still allowed before the maximum, if the protection has not
picked up. The number of starts depends on the motor’s thermal state
b waiting time before a start is allowed, if the protection has picked up.
Starting is detected when the current consumed becomes greater than 10 % of the
Ib current.
User information
The following information is available for the user:
b the waiting time before a start is allowed
b the number of starts still allowed.
See chapter "Machine operation assistance functions".
3
The number of consecutive starts is the number starts counted during the last P/Nt
minutes, Nt being the number of starts allowed per period.
The motor hot state corresponds to the overshooting of the fixed set point (50 % heat
rise) of the thermal overload function.
When the motor re-accelerates, it undergoes a stress similar to that of starting
without the current first passing through a value less than 10 % of Ib, in which case
the number of starts is not incremented.
It is possible however to increment the number of starts when a re-acceleration
occurs by a logic data input (input I22).
MT10871
Block diagram
I1
I2
I3
k1 > Nt
&
I > 0.1Ib
0
T
P mn
≥1
≥1
input I22
k2 > Nc
P mn/Nt
&
thermal alarm
(hot state)
k3 > Nh
P mn/Nt
"Clear"
Characteristics
Period of time (P)
Setting
Resolution
Nt total number of starts
Setting
Resolution
Nh and Nc number of consecutive starts
Setting (1)
Resolution
T time delay between starts
Setting
Resolution
(1) With Nc y Nf.
3/28
1 to 6 hour
1
1 to 60
1
1 to Nt
1
0 mn y T y 90 mn
1 mn or 1 digit
inhibit
closing
Protection functions
Recloser
ANSI code 79
Operation
Initialization of the recloser
The recloser is ready to operate if all of the following conditions are met:
b "CB control" function activated and recloser in service
b circuit breaker closed
b inhibition time delay not running
b none of the recloser inhibition conditions is true (see further on).
Recloser cycles
b case of a cleared fault:
v following a reclosing order, if the fault does not appear after the memory time delay
has run out, the recloser reinitializes and a message appears on the display (see
example 1)
b case of a fault that is not cleared:
v following instantaneous or time-delayed tripping by the protection unit, activation
of the isolation time delay associated with the first active cycle.
At the end of the time delay, a closing order is given, which activates the memory time
delay.
If the protection unit detects the fault before the end of the time delay, a tripping order
is given and the following reclosing cycle is activated.
v after all the active cycles have been run, if the fault still persists, a final trip order
is given, a message appears on the display and closing is locked out until
acknowledgment takes place, according to the parameter setting of the protection
function
b closing on a fault.
If the circuit breaker closes on a fault, or if the fault appears before the end of the
lockout time delay, the recloser is inhibited.
Recloser inhibition conditions
The recloser is inhibited according to the following conditions:
b voluntary open or close order
b recloser put out of service
b receipt of a lockout order on the lockout logic input I26
b appearance of a switchgear-related fault, such as trip circuit fault, or unexecture
control order fault
b opening of the circuit breaker by external tripping via inputs I21, I22 or I23.
Characteristics
Reclosing cycles
Number of cycles
Activation of cycle 1 (1)
overcurrent 1
overcurrent 2
earth fault 1
earth fault 2
overcurrent 1
overcurrent 2
earth fault 1
earth fault 2
Activation of cycles 2, 3 and 4 (1)
Setting
1 to 4
inst. / delayed / inactive
inst. / delayed / inactive
inst. / delayed / inactive
inst. / delayed / inactive
inst. / delayed / inactive
inst. / delayed / inactive
inst. / delayed / inactive
inst. / delayed / inactive
Time delays
Memory time delay
Isolation time delay
cycle 1
cycle 2
cycle 3
cycle 4
0.05 to 300 s
0.05 to 300 s
0.05 to 300 s
0.05 to 300 s
0.05 to 300 s
0.05 to 300 s
Lockout time delay
Accuracy
±2 % or 25 ms
Resolution
10 ms or 1 digit
(1) If a protection function that is inactive in relation to the recloser leads to circuit breaker
opening, the recloser is inhibited.
3/29
3
Recloser
ANSI code 79
Protection functions
MT10879
Example 1: case of successful reclosing after the first cycle. Activation with 300 ms time-delayed O/C protection
Instantaneous O/C
300 ms
Time-delayed O/C
I12 (closed position)
inhibition time delay
CB open command
3
I11 (open position)
cycle 1 isolation time delay
disengagement
time delay
CB close command
Reclosing in
progress (TS35)
“cleared fault”
message
Reclosing
successful (TS37)
MT10880
Example 2: case of definitive tripping after two cycles activated by 300 ms time-delayed O/C protection
Instantaneous O/C
300 ms
300 ms
300 ms
Time-delayed O/C
I12 (closed position)
inhibition time
delay
CB open command
I11 (open position)
cycle 1
isolation time
delay
cycle 2
isolation
time delay
CB close command
Reclosing in
progress (TS35)
Definitive tripping
(TS37)
3/30
“permanent fault”
message
Overfrequency
ANSI code 81H
Protection functions
Operation
The protection function picks up when the positive sequence voltage frequency is
above the set point and the positive sequence voltage is more than 20 % of Vnp
(Unp/3).
If a single VT is connected (U21), the function picks up when the frequency is higher
than the set point and the U21 voltage is more than 20 % of Unp.
It includes a definite time delay T.
MT10542
Block diagram
U32
Vd
U21
&
F > Fs
T
0
time-delayed output
“pick-up” signal
Vd > 0.2 Vnp
(1)
3
(1) or U21 > 0.2 Unp if only one VT.
If there is only one sensor (U21), the voltage signal is connected to terminals 1
and 2 of the connector CCT640, whatever the phase.
Characteristics
Fs set points
Setting
Resolution
50 to 53 Hz or 60 to 63 Hz
0.1 Hz
Accuracy (1)
±0.1 Hz
Pick-up / drop-out difference
0.2 Hz ±0.1 Hz
Time delay T
Setting
100 ms to 300 s
Accuracy (1)
±2 % or ±25 ms
Resolution
10 ms or 1 digit
Characteristic times (1)
Operation time
pick-up < 100 ms (typically 80 ms)
Overshoot time
< 100 ms
Reset time
< 100 ms
(1) In reference conditions (IEC 60255-6) and df/dt < 3 Hz/s.
3/31
Underfrequency
ANSI code 81L
Protection functions
Operation
The function picks up when the positive sequence voltage frequency is below the set
point and if the negative sequence voltage is more than 20 % of Vnp (Unp 3).
If a single VT is connected (U21), the function picks up when the frequency is below
the set point and the U21 voltage is more than 20 % of Unp.
It includes a definite time delay T.
Block diagram
MT10543
U32
Vd
U21
&
F < Fs
T
0
time-delayed output
“pick-up” sortie
Vd > 0.2 Vnp
3
(1)
(1) Or U21 > 0.2 Unp if only one VT.
If there is only one sensor (U21), the voltage signal is connected to terminals 1
and 2 of the connector CCT640, whatever the phase.
Characteristics
Fs set points
Setting
45 to 50 Hz or 55 to 60 Hz
Resolution
0.1 Hz
Accuracy (1)
±0.1 Hz
Pick-up / drop-out difference
0.2 Hz ±0.1 Hz
Time delay T
Setting
100 ms to 300 s
Accuracy (1)
±2 % or ±25 ms
Resolution
10 ms or 1 digit
Characteristic times (1)
Operation time
pick-up < 100 ms (typically 80 ms)
Overshoot time
< 100 ms
Reset time
< 100 ms
(1) In reference conditions (IEC 60255-6) and df/dt < 3 Hz/s.
3/32
Rate of change of frequency
ANSI code 81R
Protection functions
Operation
This function picks up when the rate of change of frequency (ROCOF) of the positive
sequence voltage overshoots the set point.
If only one VT is connected (U21), the function is inhibited.
It includes a definite time delay T.
MT10877
Block diagram
> + dFs/dt
< Fmax
Vd
f
> Fmin
&
dF/dt
1
T
0
time delayed
output
signal “pick-up”
> 0.5 Vn
< - dFs/dt
3
Characteristics
dFs/dt set point
Setting
Resolution
Accuracy
0.1 to 10 Hz/s
0.1 Hz/s
tripping
±5 % or ±0.1 Hz/s
no tripping
±3 % or ±0.05 Hz/s
Time delay T
Setting
100 ms to 300 s
Accuracy
±2 % or ±25 ms
Resolution
10 ms or 1 digit
Characteristic times (1)
Operation time
pick-up < 170 ms (130 ms typical)
Overshoot time
< 100 ms
Reset time
< 100 ms
(1) In reference conditions (IEC 60255-6).
3/33
Protection functions
General
IDMT protection functions
General
The time delay setting that should be made in order for the operation curve to pass
through the point k (Ik, tk) is:
Examples of problems to be solved
Problem 1
Knowing the type of IDMT, determine the Is current and
time delay T settings.
Theoretically, the current setting Is corresponds to the
maximum current that may be permanent: it is generally
the rated current of the protected equipment (cable,
transformer).
The time delay T is set to the operation point at 10 Is on
the curve. This setting is determined taking into
account the constraints involved in discrimination with
the upstream and downstream protection devices.
The discrimination constraint leads to the definition of
point A on the operation curve (IA, tA), e.g. the point
that corresponds to the maximum fault current affecting
the downstream protection device.
Problem 2
Knowing the type of IDMT, the current setting Is and a
point k (Ik, tk) on the operation curve, determine the
time delay setting T.
On the standard curve of the same type, read the
operation time tsk that corresponds to the relative
current
lk
----ls
and the operation time Ts10 that corresponds to the
relative current
I
----- = 10
Is
tk
k
tsk
Ts10
1
Ik/Is
10
I/Is
Another practical method:
The table on the next page gives the values of
I
ts
K = ------------ as a function of ----ts10
Is
tsk
In the column that corresponds to the type of time delay, read the value K = -------------Ts10
in the line for Ik
----Is
The time delay setting to be used so that the operation curve passes through the
tk
point k (Ik, tk) is: T = ----k
Example
Data:
type of time delay: standard inverse time (SIT)
set point: Is
a point k on the operation curve: k (3.5 Is; 4 s)
Question: What is the time delay T setting (operation time at 10 Is)?
Reading of the table: SIT column
I
line ----- = 3, 5
Is
K = 1.86
4
Answer: The time delay setting is T = ------------- = 2, 15s
1, 86
Problem 3
Knowing the current Is and time delay T settings for a type of time delay (standard
inverse, very inverse, extremely inverse), find the operation time for a current value
of IA.
On the standard curve of the same type, read the operation time tsA that corresponds
to the relative current
IA
-----Is
I
and the operation time Ts10 that corresponds to the relative current ----- = 10
Is
The operation time tA for the current IA with the Is and T settings is
T
tA = tsA × -------------Ts10
ts
MT10538
3
These 3 settings are made chronologically in the
following order: type, Is current, time delay T.
Changing the time delay T setting by x % changes all of
the operation times in the curve by x %.
ts
tk
T = Ts10 × -------tsk
MT10537
Operation time depends on the type of protection
(phase current, earth fault current, …).
Operation is represented by a characteristic curve:
b t = f(I) curve for the phase overcurrent function
b t = f(I0) curve for the earth fault function.
The rest of the document is based on t = f(I); the
reasoning may be extended to other variables I0,…
The curve is defined by:
b type (standard inverse, very inverse, extremely
inverse...)
b current setting Is which corresponds to the vertical
asymptote of the curve
b time delay T which corresponds to the operation time
for I = 10 Is.
tA
T
tsA
Ts10
1
3/34
IA/Is
10
I/Is
Protection functions
General
IDMT protection functions
Another practical method: the table below gives the
values of
ts
I
K = -------------- as a function of ----Ts10
Is
Example
Data:
b type of time delay: very inverse time (VIT)
b set point: Is
b time delay T = 0.8 s.
Question: What is the operation time for the current IA = 6 Is?
Reading of the table: VIT column
In the column that corresponds to the type
tsA
of time delay, read the value K = -------------Ts10
IA
on the line for -----Is
I
line ----- = 6
Is
The operation time tA for the current IA
with the Is and T settings is tA = K. T
Answer: The operation time for the current IA is t = 1.80 x 0.8 = 1.44 s.
Table of values of K
I/Is
SIT
VIT, LTI
EIT
and IEC/A and IEC/B and IEC/C
1.0
—
—
—
90.000 (1)
471.429 (1)
1.1
24.700 (1)
1.2
12.901
45.000
225.000
1.5
5.788
18.000
79.200
2.0
3.376
9.000
33.000
2.5
2.548
6.000
18.857
3.0
2.121
4.500
12.375
3.5
1.858
3.600
8.800
4.0
1.676
3.000
6.600
4.5
1.543
2.571
5.143
5.0
1.441
2.250
4.125
5.5
1.359
2.000
3.385
6.0
1.292
1.800
2.829
6.5
1.236
1.636
2.400
7.0
1.188
1.500
2.063
7.5
1.146
1.385
1.792
8.0
1.110
1.286
1.571
8.5
1.078
1.200
1.390
9.0
1.049
1.125
1.238
9.5
1.023
1.059
1.109
10.0
1.000
1.000
1.000
10.5
0.979
0.947
0.906
11.0
0.959
0.900
0.825
11.5
0.941
0.857
0.754
12.0
0.925
0.818
0.692
12.5
0.910
0.783
0.638
13.0
0.895
0.750
0.589
13.5
0.882
0.720
0.546
14.0
0.870
0.692
0.508
14.5
0.858
0.667
0.473
15.0
0.847
0.643
0.442
15.5
0.836
0.621
0.414
16.0
0.827
0.600
0.388
16.5
0.817
0.581
0.365
17.0
0.808
0.563
0.344
17.5
0.800
0.545
0.324
18.0
0.792
0.529
0.307
18.5
0.784
0.514
0.290
19.0
0.777
0.500
0.275
19.5
0.770
0.486
0.261
20.0
0.763
0.474
0.248
(1) Values only suitable for IEC A, B and C curves.
UIT
RI
—
—
545.905
179.548
67.691
35.490
21.608
14.382
10.169
7.513
5.742
4.507
3.616
2.954
2.450
2.060
1.751
1.504
1.303
1.137
1.000
0.885
0.787
0.704
0.633
0.572
0.518
0.471
0.430
0.394
0.362
0.334
0.308
0.285
0.265
0.246
0.229
0.214
0.200
0.188
0.176
3.062
2.534
2.216
1.736
1.427
1.290
1.212
1.161
1.126
1.101
1.081
1.065
1.053
1.042
1.033
1.026
1.019
1.013
1.008
1.004
1.000
0.996
0.993
0.990
0.988
0.985
0.983
0.981
0.979
0.977
0.976
0.974
0.973
0.971
0.970
0.969
0.968
0.967
0.966
0.965
0.964
IEEE MI
(IEC/D)
—
22.461
11.777
5.336
3.152
2.402
2.016
1.777
1.613
1.492
1.399
1.325
1.264
1.213
1.170
1.132
1.099
1.070
1.044
1.021
1.000
0.981
0.963
0.947
0.932
0.918
0.905
0.893
0.882
0.871
0.861
0.852
0.843
0.834
0.826
0.819
0.812
0.805
0.798
0.792
0.786
IEEE VI
(IEC/E)
—
136.228
65.390
23.479
10.199
6.133
4.270
3.242
2.610
2.191
1.898
1.686
1.526
1.402
1.305
1.228
1.164
1.112
1.068
1.031
1.000
0.973
0.950
0.929
0.912
0.896
0.882
0.870
0.858
0.849
0.840
0.831
0.824
0.817
0.811
0.806
0.801
0.796
0.792
0.788
0.784
IEEE EI
(IEC/F)
—
330.606
157.946
55.791
23.421
13.512
8.970
6.465
4.924
3.903
3.190
2.671
2.281
1.981
1.744
1.555
1.400
1.273
1.166
1.077
1.000
0.934
0.877
0.828
0.784
0.746
0.712
0.682
0.655
0.631
0.609
0.589
0.571
0.555
0.540
0.527
0.514
0.503
0.492
0.482
0.473
IAC I
IAC VI
IAC EI
62.005
19.033
9.413
3.891
2.524
2.056
1.792
1.617
1.491
1.396
1.321
1.261
1.211
1.170
1.135
1.105
1.078
1.055
1.035
1.016
1.000
0.985
0.972
0.960
0.949
0.938
0.929
0.920
0.912
0.905
0.898
0.891
0.885
0.879
0.874
0.869
0.864
0.860
0.855
0.851
0.848
62.272
45.678
34.628
17.539
7.932
4.676
3.249
2.509
2.076
1.800
1.610
1.473
1.370
1.289
1.224
1.171
1.126
1.087
1.054
1.026
1.000
0.977
0.957
0.939
0.922
0.907
0.893
0.880
0.868
0.857
0.846
0.837
0.828
0.819
0.811
0.804
0.797
0.790
0.784
0.778
0.772
200.226
122.172
82.899
36.687
16.178
9.566
6.541
4.872
3.839
3.146
2.653
2.288
2.007
1.786
1.607
1.460
1.337
1.233
1.144
1.067
1.000
0.941
0.888
0.841
0.799
0.761
0.727
0.695
0.667
0.641
0.616
0.594
0.573
0.554
0.536
0.519
0.504
0.489
0.475
0.463
0.450
3/35
3
Protection functions
General
IDMT protection functions
Standard inverse time SIT curve
Extremely inverse time EIT curve
Very inverse time VIT or LTI curve
Ultra inverse time UIT curve
t (s)
1 000.00
MT10540
MT10539
t (s)
100.00
100.00
10.00
curve (T = 1s)
curve (T = 1s)
3
10.00
1.00
RI
inverse time SIT
1.00
very inverse time VIT or LTI
extremely inverse EIT
ultra inverse UIT
I/Is
I/Is
0.10
0.10
1
10
1
100
100
IAC curves
t (s)
1 000.00
t (s)
10000.00
MT10529
MT10528
IEEE curves
10
1000.00
100.00
I
VI
100.00
EI
MI
VI
10.00
EI
10.00
1.00
1.00
I/Is
0.10
I/Is
1
3/36
10
100
0.10
1
10
100
General
IDMT protection functions
Protection functions
Curve equations
IEC curve, inverse type
T
k
t d ( I ) = ----------------------- × --β
I α
 ---- –1
 Is
IEC curve, RI type
T
1
t d ( I ) = ------------------------------------------------------ × ------------------– 1 3, 1706
I
0, 339 – 0,236  ----
I 
s
IEEE curve




A
T

t d ( I ) = ----------------------- + B × --
 β
P
I
  ---- – 1

I 

Characteristic curves
IEC standard inverse / A
IEC very inverse / B
IEC long time inverse / B
IEC extremely inverse / C
IEC ultra inverse
k
0.14
13.5
120
80
315.2
Characteristic curves
IEEE moderately inverse
IEEE very inverse
IEEE extremely inverse
A
0.010
3.922
5.64
α
0.02
1
1
2
2.5
B
0.023
0.098
0.0243
β
2.97
1.50
13.33
0.808
1
β
0.241
0.138
0.081
p
0.02
2
2
s
3
Characteristic curves
IAC curve



 T
B
D
E
t d ( I ) = A + -------------------- + ----------------------- + ----------------------- x ----2
3
I
I
I

----- – C ----- – C
----- – C  β

Is
 Is

Is
 
ts
IAC inverse
IAC very inverse
IAC extremely inverse
A
B
C
D
E
β
0.208
0.090
0.004
0.863
0.795
0.638
0.800
0.100
0.620
-0.418
-1.288
1.787
0.195
7.958
0.246
0.297
0.165
0.092
TMS multiplying factor
The time delay of IDMT tripping curves (except for RI curve) may be set:
b either by T sec (operation time at 10 x Is)
T
b or by TMS (factor that corresponds to --- in the equations above).
β
MT10530
IEC curve VIT type
TMS = 1
Example :
T
13, 5
t ( I ) = -------------------- × TMS with: TMS = --------1, 5
 ----I- – 1
 Is
T = 1.5 sec
The IEC curve of the VIT type is positioned so as to be the same with
TMS = 1 or T = 1.5 sec.
10
I/Is
Example: TMS multiplying factor.
Timer hold delay T1
b definite time:
enables the function to be activated with intermittent faults
b IDMT:
makes it possible to emulate an electromagnetic disk protection relay.
MT10530
tr
T
T
T1
t r ( I ) = ----------------------2 × --- with : --- = TMS
β
β
I

1 –  -----
Is
TMS = 1
T1
0
1
Example: IDMT timer hold delay T1.
I/Is
T1 = timer hold delay setting (timer hold delay for I reset = 0 and TMS = 1)
T = tripping time delay setting (at 10 Is)
k β = basic tripping curve value at 10 Is = -----------------α
10 – 1
The standardized or estimated values of T1 are available in the SFT2841 software
help.
3/37
3
3/38
Control and monitoring
functions
Contents
Assignment of logic inputs outputs
4/2
Indications
4/3
Circuit breaker / contactor control
4/4
Discrepancy
Trip circuit supervision and matching
4/6
Latching / acknowledgment
Switching of groups of settings
4/7
Logic discrimination
4/8
Thermal overload protection control
4/10
Motor re-acceleration
Detection of zero motor speed
4/11
Disturbance recording triggering
4/12
Customization
4/13
4
4/1
Control and monitoring
functions
Assignment of logic
inputs outputs
Sepam performs the basic control and monitoring functions necessary for the
operation of the electrical network, thereby reducing the need for auxiliary relays.
The use of the preset control and monitoring functions requires exclusive parameter
setting and particular wiring of the inputs according to their application and the type
of Sepam.
The advanced UMI or the SFT2841 software may be used to assign inputs and set
the control and monitoring function parameters.
Since an input may only be assigned to a single function, not all the functions are
available at the same time.
Example: if the logic discrimination function is used, the switching of groups of
settings function may not be used.
Assignment by application chart
Functions
Entrées logiques
Open position
S20
T20
M20
B21 - B22
Assignment
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b (2)
b
b (3)
b
b
b
b
I11
External tripping 3 (1)
Buchholz alarm (1) (Buchholz alarm message)
Rotor rotation detection
Thermistor tripping (1)
b
b (4)
b
End of charging position
Thermostat alarm (1) (thermostat alarm message)
Thermistor alarm (1)
b
Inhibit remote control (1)
SF6-1
b
b
b
Closed position
Logic discrimination, receive BL
Switching of groups of settings A/B
External reset
External tripping 4 (1)
4
External tripping 1 (1)
External network synchronization
External tripping 2 (1)
Motor reacceleration
SF6-2
Change of thermal settings
Inhibit thermal overload
Inhibit recloser
Logic outputs
Tripping
Inhibit closing
Watchdog
Closing order
b
b
b
b
b
b
b
b
b
I12
I13
b
b
b
b
b
b
b
b
b
b
b
b
b
I14
b
I23
b
b
b
b
b
b
b
b
b
I21
I22
I24
b
b
b
I25
b
b
b
b
O1
I26
b
b
b
b
b
b
b
b
b
b
b
b
b
O2
O4
O11
Note: all of the logic inputs are available via the communication link and are accessible in the SFT2841 control matrix for other non predefined applications.
(1) These inputs have parameter setting with the prefix "NEG" for undervoltage type operation.
(2) Buchholz/Gas trip message.
(3) Thermostat trip message.
(4) Pressure trip message.
4/2
Control and monitoring
functions
Indications
Front panel indication
The appearance of alarms is indicated locally by:
b messages on the advanced UMI display unit
b signal lamps on the front panel.
Signal lamp addressing may be set using SFT2841.
Remote indications
Allows remote transfer of information via the communication link.
Information such as breaker position, SF6 fault alarm, etc.
Processing of alarms on the advanced UMI
b when an event occurs, the signal lamp goes on and the related message is
displayed
b the user presses the "clear" button to clear the message display
b after the fault has disappeared, the user presses the "reset" button, the signal
lamp goes off and the protection unit is reset
b the list of alarm messages remains accessible (
button) and may be erased by
pressing the "clear" button.
List of messages (1)
Functions
Phase overcurrent
Earth fault
Thermal overload
English (factory)
French
PHASE FAULT
DEFAUT PHASE
EARTH FAULT
DEFAUT TERRE
THERMAL ALARM
ECHAUFT. ALARME
THERMAL TRIP
ECHAUFT. DECLT.
Negative sequence / unbalance
UNBALANCE
DESEQUILIBRE
Locked rotor /
ROTOR BLOCKING
BLOCAGE ROTOR
Locked rotor on start
STRT LOCKED ROTR.
BLOC ROTOR DEM
Excessive starting time
LONG START
DEMARRAGE LONG
Starts per hour
START INHIBIT
DEMARRAGE INHIBE
Phase undercurrent
UNDER CURRENT
COURANT <<
Phase-to-phase overvoltage
OVERVOLTAGE
TENSION >>
Phase-to-phase undervoltage
UNDERVOLTAGE
TENSION <<
Positive sequence undervoltage
UNDERVOLTAGE
TENSION <<
Phase-to-neutral undervoltage
UNDERVOLT. V1
TENSION << V1
UNDERVOLT. V2
TENSION << V2
UNDERVOLT. V3
TENSION << V3
Neutral voltage displacement
Vo FAULT
DEFAUT Vo
Overfrequency
OVER FREQ.
FREQUENCE >>
Underfrequency
UNDER FREQ.
FREQUENCE <<
Rate of change of frequency
ROCOF
DERIV. FREQ.
Temperature monitoring (2)
OVER TEMP. ALM
T° ALARME
OVER TEMP. TRIP
T°. DECLT.
RTD’S FAULT
DEFAUT SONDES
Thermostat (3)
THERMOST. ALARM
THERMOT. ALARME
THERMOST. TRIP
THERMOST. DECLT.
Buchholz (3)
BUCHHOLZ ALARM
BUCHH ALARME
BUCHH/GAS TRIP
BUCHH/GAZ DECLT.
Pressure (3)
PRESSURE TRIP
PRESSION DECLT.
Thermistor PTC/NTC
THERMIST. ALARM
THERMIST. ALARME
THERMIST. DECLT.
THERMIST. TRIP
Trip circuit supervision
TRIP CIRCUIT
CIRCUIT DECLT.
Circuit breaker / contactor control
CONTROL FAULT
DEFAUT COMDE.
Recloser
PERMANENT FAULT
DEFAUT PERMANT.
Recloser
CLEARED FAULT
DEFAUT ELIMINE
(1) According to type of Sepam and Sepam equipped with advanced UMI, or SFT2841. Messages by default, the wording of the messages may be changed (please
consult us).
(2) RTD fault message: refer to the maintenance chapter.
(3) According to parameter setting logic input I21 to I24 (T20 type).
4/3
4
Control and monitoring
functions
Circuit breaker / contactor control
Description
Sepam may be used to control breaking devices equipped with different types of
closing and tripping coils.
b circuit breaker with shut trip or undervoltage tripping coil (parameter set on the
front of the advanced UMI or in SFT2841)
b latching contactor with shunt trip coil.
Two breaking device control modes are available:
b use of operating mechanism integrated in the circuit breaker / contactor
This logical function processes all the circuit breaker closing and tripping conditions
based on:
v breaking device status information
v remote control orders
v protection functions
v specific program logic for each application (e.g. recloser)
v etc.
This function also inhibits closing of the breaking device according to the operating
conditions.
b use of customized program logic
A control and monitoring resource assignment matrix may be used to create
customized program logic.
Operating mechanism integrated in the circuit breaker /
contactor
4
For operation in accordance with the block diagram, the Sepam must have the logic
inputs required (an MES114 module must therefore be included) and the related
parameter setting and wiring must be done.
Remote tripping
Circuit breaker / contactor tripping may be controlled remotely via the communication
link.
The circuit breaker / contactor tripping order may be activated at any time and is not
inhibited by logic input I25.
Circuit breaker / contactor closing orders and Sepam acknowledgment via the
communication link may be inhibited by logic input I25.
4/4
Control and monitoring
functions
Circuit breaker / contactor control
DE50373
Block diagram (1): Sepam S20, T20 or M20
(I26) inhibition F49
inhibit start
(thermal overload)
protection 66:
starts per hour
(I25) pressure drop SF6.1
(I26) pressure drop SF6.2
&
T
u1
0
u1
T = 200 ms
trip circuit fault
protection functions valided for
tripping
- overcurrent
- ...
.
.
.
u1
O2
inhibit closing
(2)
u1
(I21) external tripping 1
(I22) external tripping 2
u1
(I23) external tripping 3
u1
0
u1
(I14) external tripping 4
(TC1) open order
(I26) inhibition F49
T
O1
tripping (shunt /
undervoltage)
T = 200 ms
&
thermal overload 49 tripping
4
“open” order by recloser
TC2 close order
(I12) device closed
0
&
&
(I25) remote control disable
T
T = 200 ms
(I12) device
closed
u1
“close” order by recloser
&
O11
close order
&
Block diagram (1): Sepam B21 (3) or B22
DE50374
(I25) pressure drop SF6.1
(I26) pressure drop SF6.2
u1
T
0
T = 200 ms
trip circuit fault
u1
u1
O2
inhibit closing
(2)
(I21) external tripping 1
(I22) external tripping 2
(I23) external tripping 3
u1
(TC1) open order
(I14) external tripping 4
(I12) device closed
TC2 close order
(I25) remote control disable
&
0
u1
T
O1
tripping (shunt /
undervoltage)
T = 200 ms
&
0
T
&
T = 200 ms
(I12) device
closed
&
O11
close order
(1) Data used in the logic block diagram depend on the Sepam type, availability of MES114
option and general parameters.
(2) The usual case in which O2 is set to “undervoltage coil” (normaly closed).
(3) Performs B20 type functions.
4/5
Discrepancy
Trip circuit supervision
and matching
Control and monitoring
functions
TC/circuit breaker position discrepancy
Description
This function detects a discrepancy between the last remote control order received
and the actual position of the circuit breaker.
The information is accessible via remote indication TS42.
MT10189
Block diagram (1)
TC1
received
&
I11
1
TC2
received
T = 1s
remote control/
position
discrepancy
&
I12
MT10190
5
O1
Trip circuit supervision and open / closed matching
D
A
Description
This supervision is designed for trip circuits:
b with shunt trip units
The function detects:
v circuit continuity
v loss of supply
v mismatching of position contacts.
The function inhibits closing of the breaking device.
b with undervoltage trip units
The function detects:
b mismatching of position contacts, coil supervision being unnecessary in this case.
The information is accessible in the matrix and via the remote indication TS43.
+
_
4
M
4
1
I11
2
4
5
I12
Wiring for shunt trip unit.
Open and close order supervision
5
O1
4
M
Following a circuit breaker open or close order, the system checks whether, after a
200 ms time delay, the circuit breaker has actually changed status.
If the circuit breaker status does not match the last order sent, a "Control fault"
message and remote indication TS45 are generated.
+
_
D
1
Block diagram (1)
I11
I12
2
4
5
I11
MT10192
MT10191
A
&
I12
≥1
Wiring for undervoltage trip unit.
T
0
1
T = 200 ms
reset
trip circuit fault
0
&
(1) With MES option.
The function is activated if inputs I11 and I12 are set respectively as circuit breaker "open
position" and circuit breaker "closed position".
4/6
Latching / acknowledgment
Switching of groups of settings
Control and monitoring
functions
Latching / acknowledgment
The functions that trigger tripping may be latched individually at the time of parameter
setting and reset according to different modes.
Latched tripping orders are stored and must be acknowledged for the device to be
put back into service.
Acknowledgment may be done locally on the UMI or remotely through a logic input
or via the communication link.
Block diagram
MT10188
“RESET” key
acknowledgment (TC5)
&
≥1
reset
inhibit remote control (I25)
external reset (I14)
Switching of groups of settings
There are 4 relays for the phase overcurrent and earth fault protection functions, split
into two groups of 2 relays, called group A and group B respectively.
The use of the protection relays is determined by parameter setting.
The switching of groups of settings function enables the group A or group B
protection functions to be activated:
b according to the status of logic input I13
v I13 = 0: activation of group A
v I13 = 1: activation of group B
b or via the communication link
v TC3: activation of group A
v TC4: activation of group B.
The use of the switching of groups of settings functions does not exclude the use of
the logic discrimination function.
4/7
4
Control and monitoring
functions
Logic discrimination
Description
With this type of system, time delays are set in accordance with the device to be
protected, without any concern for the discrimination aspect.
Operating principle
sending of BI
MT10195
This function provides:
b full tripping discrimination
b a substantial reduction in delayed tripping of the
circuit breakers located nearest the source (drawback
of the classical time-based discrimination process).
The system applies to the definite time (DT) and IDMT
phase overcurrent and earth fault protection functions.
MT10196
level "n+1"
Sepam
O3
+
td : X+0.9s
O3 output
other level
"n" Sepam
td : X+0.6s
level "n"
Sepam
O3
td : X+0.3s
4
receipt of BI
td : Xs
MT10197
e.g.: Radial distribution with use of time-based discrimination
(td: tripping time definite time curves).
td : Xs
MERLIN
GERIN
When a fault occurs in a radial network, the fault current flows through the circuit
between the source and the location of the fault:
b the protection units upstream from the fault are triggered
b the protection units downstream from the fault are not triggered
b only the first protection unit upstream from the fault should trip.
Each Sepam is capable of sending and receiving blocking input orders except for
motor Sepams (1) which can only send blocking input orders.
When a Sepam is triggered by a fault current:
b it sends a blocking input order to output O3 (2)
b it trips the associated circuit breaker if it does not receive a blocking input order on
the blocking input logic input (3).
The sending of the blocking input lasts the time it takes to clear the fault.
It is interrupted after a time delay that takes into account the breaking device
operating time and protection unit reset time.
This system minimizes the duration of the fault, optimizes discrimination and
guarantees safety in downgraded situations (wiring or switchgear failure).
td : Xs
MERLIN
Pilote wire test
GERIN
The pilot wire test may be performed using the output relay test function.
td : Xs
MERLIN
GERIN
BI order
td : Xs
MERLIN
GERIN
e.g.: radial distribution with use of the Sepam logic
discrimination system.
4/8
(1) Motor Sepams are not affected by the receipt of a blocking input since they are designed for
loads only.
(2) Default parameter setting.
(3) According to parameter setting and presence of an additional MES114 module.
Control and monitoring
functions
Logic discrimination
DE50375
Block diagram: Sepam S20 and T20
(2)
overcurrent
inst. relay 1 (group A)
inst. relay 2 (group A)
(2)
earth fault
inst. relay 1 (group A)
inst. relay 2 (group A)
BI transmission
BI receipt
time delay settings
for time-based
discrimination
time delay settings
for logic
discrimination
output Oxx
(1)
: BI transmission
u 1 to BI transmission
&
T
0
T = 0,2 s
inhibition of BI transmission
if fault is not cleared
overcurrent (time)
time-delayed relay 1 (group B)
time-delayed relay 2 (group B)
earth fault (time)
time-delayed relay 1 (group B)
time-delayed relay 2 (group B)
overcurrent (logic discrim)
time-delayed relay 1 (group A)
time-delayed relay 2 (group A)
earth fault (logic discrim)
time-delayed relay 1 (group A)
time-delayed relay 2 (group A)
u1
u1
tripping (01)
u1
&
4
log. Input I13: Bl receipt
DE50376
Block diagram: Sepam M20
(2)
overcurrent
inst. relay 1 (group A)
inst. relay 2 (group A)
earth fault
(2)
output Oxx
(1)
: BI transmission
u 1 to BI transmission
inst. relay 1 (group A)
T
inst. relay 2 (group A)
0
&
T = 0.2 s
inhibition of BI
transmission
overcurrent
time-delayed relay 1 (group B)
time-delayed relay 2 (group B)
earth fault
u1
tripping
time-delayed relay 1 (group B)
time-delayed relay 2 (group B)
(1) According to parameter setting (O3 by default).
(2) Instantaneous action (inst) corresponds to protection "pick-up" signal information.
4/9
Control and monitoring
functions
Thermal overload protection
control
Description
The control and monitoring resources may be used to actuate the thermal overload
protection function.
The logic input I26 (MES114 module) may be used:
b to change the thermal settings of the protected equipment
b to inhibit the thermal overload protection function.
The two uses of the logic input I26 are exclusive.
Change of thermal settings
Taking into account 2 transformer operating rates
Power transformers often have 2 ventilation operating rates:
b ONAN (Oil Natural, Air Natural)
b ONAF (Oil Natural, Air Forced).
The 2 groups of thermal overload protection parameters enable both of these
operating rates to be taken into account.
Switching from one group of thermal settings to the other is controlled by logic input
I26.
Switching is carried out without any loss of the thermal capacity used value.
Taking into account 2 motor operating rates
Switching from one set of thermal settings to the other is controlled by.
b logic input I26
b overrun of a set point by the equivalent current
(see "protection functions" chapter, thermal overload section)
The 2 groups of thermal overload protection parameters enable both operating rates
to be taken into account.
Switching is carried out without any loss of the thermal capacity used value.
4
Inhibition of the thermal overload protection function
Tripping of the thermal overload protection function (in the case of a motor) may be
locked out, when required by the process, by:
b logic input I26
b remote control order TC7 (inhibit thermal overload protection).
Remote control order TC13 may be used to enable the operation of the thermal
overload protection function.
4/10
Control and monitoring
functions
Motor re-acceleration
Detection of zero motor speed
Motor re-acceleration (locked rotor, starts per hour)
When a motor re-accelerates, it absorbs a current close to the starting current
without the current passing previously through a value of less than 10 % of Ib
(Ib: basic current of the motor to be protected).
Control via I22 makes it possible to:
b reinitialize the excessive starting time protection function
b set the locked rotor protection time delay to a low value.
Logic input I22 may also be used to increment the number of starts to take into
account motor re-acceleration.
The logic input I22 control order enables optimum use of the starts per hour
protection function.
Detection of zero speed (rotor locked on starting)
To protect large motors correctly upon startup, and quickly detect locked rotors, an
LTS time delay may be set for tripping if current I is greater than set point Is and if the
motor speed is zero.
Logic input I23 is linked to a zero speed switch.
When starting is correct (no locked rotor), logic input I23 inhibits the locked rotor on
starting protection function.
4
4/11
Disturbance recording triggering
Control and monitoring
functions
Description
The recording of analog values and logical signals may be triggered by different
events, according to parameter setting or by manual action
b tripping by the instantaneous output of selected protection functions
b tripping by the time-delayed output of selected protection functions
b remote manual tripping by a remote control order (TC10)
b manual tripping via the SFT2841 software.
Disturbance recording may be:
b inhibited via the SFT2841 software or by remote control order (TC8)
b validated via the SFT2841 software or by remote control order (TC9).
DE50377
Block diagram
disturbance recording triggering
according to chosen protection
functions (delayed outputs)
pick-up
manual disturbance
recording triggering
u1
SFT2841
TC10
&
4
4/12
inhibition of
disturbance recording
triggering
SFT2841
validation of
disturbance recording
triggering
SFT2841
manual disturbance
recording triggering
SFT2841
u1
TC8
&
TC9
u1
TC10
disturbance recording
triggering
Customization
Control and monitoring
functions
MT10907
Each Sepam has a default program logic according to the chosen type (S20, T20,…).
Each default program logic combines information from the protection functions with
signal lamps and output relays to fit the most current use of the unit.
The default assignment may be customized, if necessary, by filling in the "control
matrix" table in the SFT2841 software.
Example of "control matrix" screen.
Example of customized program logic for a Sepam equipped with the optional MES114 module.
ES (2)
Output
Signal lamps
O1
O2
Phase protection
(latching)
50/51-1
b
b
b
b
50/51-2
b
b
b
b
Earth fault
protection
50N/51N-1
b
b
b
b
50N/51N-2
b
b
b
b
Unbalance
protection
Recloser
46
b
b
b
79
b
Open position
I11
b
Closed position
I12
b
Blocking input
receipt
Line switch open (1)
I13
b
I14
b
Tripping by
external protection
I21
I22
I23
I24
I25
b
b
I26
b
Functions
Inhibit remote
control
SF6
pressure drop
Blocking
input transmission
"Pick-up" signal
Watchdog
Output
O1 - tripping
O2 - inhibit closing
O3 - BI transmission
O4 - watchdog
O11 - close order
O12 - phase fault indication
O13 - earth fault indication
O14 - permanent fault
b
O3
O4
O12
O13
O14 L1
L2 L3
L4
L5 L6 L7 L8 L9
b
b
b
b
b
breaker
control
4
b
b
b
b
b
b
b
trip circuit
supervision
logic
selectivity
b
remote control
b
b
logic
selectivity
disturbance
recording
triggering
b
b
O11
Associated
functions
b
Signal lamps
L1 - I > 51
L2 - I >> 51
L3 - Io > 51N
L4 - Io >> 51N
L5 - ext
L6 L7 - off
L8 - on
L9 - Trip
(1) Or CB withdrawned position.
(2) In service.
4/13
YFJYVIIVGIT
6FKQHLGHU(OHFWULF
)55(9$
Modbus communication
Presentation
Presentation
5/2
Modbus protocol
5/3
Implementation
5/4
Data addresses and encoding
5/6
Time-tagging of events
5/15
Access to remote settings
5/21
Disturbance recording
5/30
5
5/1
Modbus communication
Presentation
General
Modbus communication enables Sepam to be connected to a remote monitoring
and control system equipped with a master Modbus communication channel and a
physical link of the RS 485 type, optical fibre or another interface equipped with an
appropriate converter.
The Modbus protocol used by Sepam is a compatible sub-group of the RTU
Modbus (1) protocol (a Modbus master can communicate with several Sepam units).
Sepam is always a slave station.
All the Sepam units can be equipped with the ACE949-2 (2-wire) or ACE959 (4-wire)
interface for connection to a communication network, RS485 (2) and ACE937 for
connection to a communication network, fiber optics in star arrangement.
Data available
The data available depend on the type of Sepam.
Measurement readout
b phase and earth fault currents
b peak demand phase currents
b tripping currents
b cumulative breaking current
b phase-to-phase, phase-to-neutral and residual voltages
b frequency
b temperatures
b thermal capacity used
b starts per hour and inhibit time
b running hours counter
b motor starting current and time
b operating time before overload tripping
b waiting time after tripping
b operating time and number of operations
b circuit breaker charging time.
5
Program logic data readout
b a table of 64 pre-assigned remote indications (TS) (depends on the type of
Sepam) enables the readout of program logic data status
b readout of the status of 10 logic inputs.
Remote control orders
Writing of 16 impulse-type remote control orders (TC) in either direct mode or SBO
(Select Before Operate) mode via 16 selection bits.
Other functions
b reading of Sepam configuration and identification
b time-tagging of events (synchronization via the network or externally via logic input
I21), time-tagging within a ms
b remote reading of Sepam settings
b remote setting of protection units
b remote control of the analog output (3)
b transfer of disturbance recording data.
(1) Modbus is a Modicon registered trademark.
(2) Refer to document PCRED399074EN " Sepam - RS 485 network connection guide" regarding
network implementation.
(3) With MSA141 option.
5/2
Modbus protocol
Modbus communication
Characterization of exchanges
master
MT10248
The Modbus protocol may be used to read or write one
or more bits, one or more words, the contents of the
event counters or the contents of the diagnosis
counters.
request
Modbus functions supported
reply
MERLIN GERIN
MERLIN GERIN
MERLIN GERIN
slave
slave
slave
Exchanges are initiated by the master and include a request by the master and a
reply by the slave (Sepam). Requests by the master are either addressed to a given
Sepam identified by its number in the first byte of the request frame, or addressed to
all the Sepam (broadcasting).
MT10244
master
broadcasting
MERLIN GERIN
MERLIN GERIN
5
MERLIN GERIN
slave
slave
slave
Broadcast commands are necessarily write commands.
No replies are transmitted by the Sepam.
MT10249
Sepam Modbus protocol supports 11 functions:
b function 1: reading of n output or internal bits
b function 2: reading of n input bits
b function 3: reading of n output or internal words
b function 4: reading of n input words
b function 5: writing of 1 bit
b function 6: writing of 1 word
b function 7: high-speed reading of 8 bits
b function 8: reading of diagnosis counters
b function 11: reading of Modbus event counters
b function 15: writing of n bits
b function 16: writing of n words.
The following exception codes are supported:
b 1: unknown function code
b 2: incorrect address
b 3: incorrect data
b 7: not acknowledged (remote reading and setting).
request
reply
MERLIN GERIN
master
slave
It is not necessary to have a detailed knowledge of the protocol unless the master is
a central computer which requires the corresponding programming. All Modbus
exchanges include 2 messages: a request by the master and a reply by the Sepam.
All the frames that are exchanged have the same structure. Each message or frame
contains 4 types of data:
slave
number
function
code
data
zones
CRC 16
check zone
b slave number (1 byte): this indicates the receiving Sepam (0 to FFh).
If it is equal to zero, the request concerns all the slaves (broadcasting) and there is
no reply message
b function code (1 byte): this is used to select a command (read, write, bit, word) and
to check that the reply is correct
b data zones (n bytes): these zones contain the parameters relating to the function:
bit, address, word address, bit value, word value, number of bits, number of words
b check zone (2 bytes): this zone is used to detect transmission errors.
Synchronization of exchanges
Any character that is received after a silence of more than 3 characters is considered
as the beginning of a frame. A silence of at least 3 characters must be left on the line
between two frames.
Example: at 9600 bauds, this time is equal to approximately 3 milliseconds.
5/3
Modbus communication
Implementation
Communication interface characteristics
Type of transmission
Asynchronous serial
Protocol
Modbus slave (Jbus profile)
Rate
4800, 9600, 19200, 38400 bauds.
Data format
1 start, 8 bits, no parity, 1 stop
1 start, 8 bits, even parity, 1 stop
Response time
Less than 15 ms
Maximum number of Sepams on a
Modbus network
RS 485 electrical interface
25
1 start, 8 bits, odd parity, 1 stop
(lengths multiplied by 3 with FILECA
ACE949-2, compliant with EIA standard
2-wire differential RS 485
ACE959, compliant with EIA standard
4-wire differential RS 485
External, by auxiliary supply
12 V DC or 24 V DC
Screw-type terminals and clamps for
recovery of shielding
With interfaces with 12 V dc distributed
supply
320 m with 5 Sepam
cable, with a maximum of 1300 m)
180 m with 10 Sepam
Electrical interface power supply
Type of connection
Maximum length of RS 485 network
160 m with 20 Sepam
125 m with 25 Sepam
With interfaces with 24 V DC distributed
supply
1000 m with 5 Sepam
750 m with 10 Sepam
450 m with 20 Sepam
375 m with 25 Sepam
5
For further details, refer to "Sepam - RS 485 network connection guide" PCRED399074EN.
Fiber optics interface, refer to the chapter "connection of ACE937 interfaces", page 6/27.
broadcasting
DE50378
question
Tr y 15 ms
question
Response time
reply
Tr y 15 ms
The communication coupler response time (Tr) is less than 15 ms, including a
3-character silence (approximately 3 ms at 9600 bauds).
This time is given with the following parameters:
b 9600 bauds
b format: 8 bits, odd parity, 1 stop bit.
Setting the communication parameters
Before a Sepam equipped with the Modbus communication system is put into
service, 4 parameters need to be set. Those parameters are saved in the event of a
power outage.
Communication parameters
Transmission rate,
adjustable from 4800 to 38400 bauds
Slave number assigned to Sepam
adjustable from 1 to 255
Parity: even parity, odd parity, no parity
Direct / confirmed remote control mode
Factory setting
9600 bauds
N° 001
Even parity
Direct
The Modbus slave number should be assigned before Sepam is connected to the
communication network (all Sepams have a slave number that is factory-set to 1).
Set the communication parameters before connecting Sepam to the communication
network.
The communication parameters may be changed while Sepam is operating without
disturbing operation. Sepam ignores the first frame received after it is energized or
after the communication parameters are changed via SFT2841.
"Activity on the line" indicator:
The green indicator on the ACE949-2 or ACE959 accessory is activated by variations
of the electrical signal on the RS 485 network (optical signals for the ACE937). When
the master communicates with Sepam (sending or receiving), the green indicator
flashes.
5/4
Modbus communication
Implementation
Testing the link
b after wiring, check the indications given by the green "activity on the line" indicator
b carry out read and write cycles using the test zone and the Modbus echo mode
b use the SFT2819 software to read and write the test zone.
Test zone
Read
Send
01 03 0C00 0002 (C75B) crc,
Receive
01 03 04 0000 0000 (FA33) crc.
Write
Send
01 10 0C00 0001 02 1234 (6727) crc,
Receive
01 10 0C00 0001 (0299) crc.
The Modbus frames opposite, sent by or received by a remote monitoring and control
system, are data used for test purposes when the communication link is first
implemented.
The CRC received by Sepam is recalculated, making it possible to test the
calculation of the CRC sent by the master:
b if the CRC received is correct, Sepam replies
b if the CRC received is incorrect, Sepam does not reply.
Read
Send
01 03 0C00 0001 (875A) crc,
Receive
01 03 02 1234 (B533) crc.
Modbus echo mode (see Modbus protocol function 8)
Send
01 08 0000 1234 (ED7C) crc,
Receive
01 08 0000 1234 (ED7C) crc.
Diagnosis counters
The diagnosis counters managed by Sepam are:
b CPT1, first word: number of correct frames received, whether or not the slave is
concerned
b CPT2, second word: number of frames received with CRC error, or frames
received with more than 255 bytes and not interpreted, or frames received with at
least one character that has a parity error, “overrun”, “framing”, “break” on the line.
An incorrect rate causes incrementation of CPT2
b CPT3, third word: number of exception replies generated (even if not sent, as a
result of a broadcast request)
b CPT4, fourth word: number of frames specifically addressed to the station
(excluding broadcasting)
b CPT5, fifth word: number of broadcast frames received with no errors
b CPT6, sixth word: not significant
b CPT7, seventh word: number of “Sepam not ready” replies generated
b CPT8, eighth word: number of frames received with at least one character that has
a parity error, “overrun”, “framing”, “break” on the line
b CPT9, ninth word: number of correct requests received and correctly executed.
The CPT2 and CPT9 counters may be viewed with SFT2841 (“Sepam diagnosis"
screen).
The counters may be accessed via the dedicated reading function (Modbus protocol
function 11).
When the value of a counter is equal to FFFFh (65535), it automatically switches to
0000h (0). After an auxiliary supply outage the diagnosis counters are initialized to
zero.
Malfunctions
b it is advisable to connect the Sepam to the RS 485 network one by one
b the display of the CPT2 and CPT9 diagnosis counters with SFT2841 ("Sepam
diagnosis" screen) makes it possible to check Modbus exchanges
b check the slave number, rate and format using SFT2841 of the Sepam UMI.
Make sure that the master is sending frames to the Sepam concerned by checking
the activity on the RS 232 - RS 485 converter, if there is one, and on the ACE949-2
or ACE959 module.
b check the wiring on each ACE949-2 or ACE959 module
b check the tightening of the screw-type terminals on each module
b check the connection of the CCA612 cord linking the ACE949-2 or ACE959
module to the Sepam unit (marked ©)
b check that polarization is only at one point and that impedance matching is at the
ends of the RS 485 network
b check that the cable being used is the recommended one
b check that the ACE909-2 or ACE919 converter is connected and set up correctly.
5/5
5
Modbus communication
Data addresses and encoding
Presentation
Data which are similar from the monitoring and control application viewpoint are
grouped together in adjacent address zones:
Hexadecimal
starting
address
0002
0006
0005
000F
3, 16
3
0040
0041
0040
0060
3, 6, 16
3
0070
0071
0070
0090
3, 6, 16
3
0100
0105
Measurements
Remote control orders
0106
01F0
0131
01F0
Remote control confirmation
01F1
01F1
Test zone
0C00
0C0F
3, 4
1, 2*
3, 4
3, 4, 6, 16
1, 2, 5, 15*
3, 4, 6, 16
1, 2, 5, 15*
3, 4, 6, 16
1, 2, 5, 15
2000
2080
2100
207C
2080
217C
3
3, 6, 16
3, 6
2200
2204
2300
2301
2203
2228
2300
237C
3, 16
3
3, 6, 16
3
FC00
FC10
FC02
FC22
3
3
Synchronization zone
Identification zone
First event table
Exchange word
Events (1 to 4)
Second event table
Exchange word
Events (1 to 4)
Data
States
Protection settings
Reading
Reading request
Remote settings
Disturbance recording
Choice of transfer function
Identification zone
Fault rec. exchange word
Fault rec. data
Application
Configuration
Application identification
5
Ending
address
Modbus functions
enabled
N.B. Non-addressable zones may reply by an exception message or else supply
non-significant data.
(*) these zones may be accessed in word mode or in bit mode.
The address of bit i (0 y i y F) of address word J is then (J x 16) + i.
e.g. 0C00 bit 0 = C000 0C00 bit 7 = C007.
5/6
Modbus communication
Data addresses and encoding
Synchronization zone
The synchronization zone is a table which contains the absolute date and time for
the time-tagging function. Time messages should be written in a single block
containing 4 words, using function 16: write word.
Messages can be read word by word or by groups of words using function 3.
Synchronization zone
Word address
Access
Binary time (year)
0002
Binary time (months + days)
0003
Binary time (hours + minutes)
0004
Binary time (milliseconds)
0005
See "time-tagging of events" chapter for data format.
Modbus function
enabled
3, 16
3
3
3
Read/write
Read
Read
Read
Identification zone
The identification zone contains system-type information pertaining to the
identification of the Sepam equipment.
Some of the information in the identification zone is also found in the configuration
zone at the address FC00h.
Identification zone
Manufacturer identification
Equipment
Marking + equipment type
Communication version
Application version
Sepam check-word
Synthesis zone
Command
Extension zone address
Word address
Access
0006
0007
0008
0009
000A/B
000C
000D
000E
000F
R
R
R
R
R
R
R
R/W
R
Modbus function
enabled
3
3
3
3
3
3
3
3/16
3
Format
Value
Not managed
0100
0
Idem FC01
Idem FC02
0
Idem 0100
0
Init. to 0
FC00
Not managed
Not managed
5
First events zone
The events zone is a table which contains a maximum of 4 time-tagged events.
Events should be read in a single block containing 33 words using function 3.
The exchange word can be written using functions 6 or 16, and read individually using
function 3.
Events zone 1
Word address
Exchange word
0040
Event n°1
0041-0048
Event n°2
0049-0050
Event n°3
0051-0058
Event n°4
0059-0060
See "time-tagging of events" chapter for data format.
Access
Read/write
Read
Read
Read
Read
Modbus function
enabled
3, 6, 16
3
3
3
3
Second events zone
The events zone is a table which contains a maximum of 4 time-tagged events.
Events should be read in a single block containing 33 words using function 3.
The exchange word can be written using functions 6 or 16 and read individually using
function 3.
Events zone 2
Word address
Exchange word
0070
Event n°1
0071-0078
Event n°2
0079-0080
Event n°3
0081-0088
Event n°4
0089-0090
See "time-tagging of events" chapter for data format.
Access
Read/write
Read
Read
Read
Read
Modbus function
enabled
3, 6, 16
3
3
3
3
5/7
Modbus communication
Data addresses and encoding
Status zone
The status zone is a table which contains the Sepam check-word, pre-assigned
remote annunciation bits (TS), and logical inputs.
Status
Sepam check-word
TS1-TS16
TS17-TS32
TS33-TS48
TS49-TS64
Logical inputs
Word address
Bit address
Access
100
101
102
103
104
105
1000
1010
1020
1030
1040
1050
R
R
R
R
R
R
Modbus function
enabled
3/4 or 1, 2, 7
3/4 or 1, 2
3/4 or 1, 2
3/4 or 1, 2
3/4 or 1, 2
3/4 or 1, 2
Format
X
B
B
B
B
B
Measurement zone (S20, T20, M20 types)
Measurements
5
Word address
Access
I1 phase current (gain x 1)
106
R
Modbus function
enabled
3/4
Format
Unit
16NS
0.1 A
I2 phase current (gain x 1)
107
R
3/4
16NS
0.1 A
I3 phase current (gain x 1)
108
R
3/4
16NS
0.1 A
I0 residual current (gain x 1)
Im1 average phase current (x 1)
109
10A
R
R
3/4
3/4
16NS
16NS
0.1 A
0.1 A
Im2 average phase current (x 1)
10B
R
3/4
16NS
0.1 A
Im3 average phase current (x 1)
10C
R
3/4
16NS
0.1 A
I1 phase current (gain x 10)
10D
R
3/4
16NS
1A
I2 phase current (gain x 10)
10E
R
3/4
16NS
1A
I3 phase current (gain x 10)
10F
R
3/4
16NS
1A
I0 residual current (gain x 10)
110F
R
3/4
16NS
1A
IM1 average phase current (x10)
111
R
3/4
16NS
1A
IM2 average phase current (x10)
112
R
3/4
16NS
1A
IM3 average phase current (x10)
113
R
3/4
16NS
1A
IM1 peak demand phase current
114
R
3/4
16NS
1A
IM2 peak demand phase current
115
R
3/4
16NS
1A
IM3 peak demand phase current
116
R
3/4
16NS
1A
Reserved
117
R
3/4
-
-
Itrip1 tripping current
118
R
3/4
16NS
10 A
Itrip2 tripping current
119
R
3/4
16NS
10 A
Itrip3 tripping current
11A
R
3/4
16NS
10 A
Itrip0 tripping current
11B
R
3/4
16NS
1A
Cumulative breaking current
11C
R
3/4
16NS
1 (kA)2
Number of operations
11D
R
3/4
16NS
1
Operating time
11E
R
3/4
16NS
1 ms
Charging time
11F
R
3/4
16NS
1 sec
Reserved
120
R
3/4
-
-
Running hours counter
121
R
3/4
16NS
1h
Thermal capacity used
122
R
3/4
16NS
%
Operating time before overload tripping
123
R
3/4
16NS
1 min
Waiting time after overload tripping
124
R
3/4
16NS
1 min
Unbalance ratio
125
R
3/4
16NS
% Ib
Starting time / overload
126
R
3/4
16NS
0.1 sec
Starting current overload
127
R
3/4
16NS
1A
Start inhibit time delay
128
R
3/4
16NS
1 min
Number of starts allowed
129
R
3/4
16NS
1
Temperatures 1 to 8
12A/131
R
3/4
16S
1 °C
Reserved
132/1EF
Prohibited
Note: Only the measurements related to the Sepam function are significant. The values of the others are zero.
5/8
Modbus communication
Data addresses and encoding
Measurement zone (B20, B21, B22 types)
Measurements
Word address
Access
Format
Unit
R
Modbus function
enabled
3/4
U21 phase to phase voltage (x1)
106
U32 phase to phase voltage (x1)
107
16NS
1V
R
3/4
16NS
U13 phase to phase voltage (x1)
1V
108
R
3/4
16NS
1V
V1 phase to neutral voltage (x1)
109
R
3/4
16NS
1V
V2 phase to neutral voltage (x1)
10A
R
3/4
16NS
1V
V3 phase to neutral voltage (x1)
10B
R
3/4
16NS
1V
V0 residual voltage (x1)
10C
R
3/4
16NS
1V
Positive sequence voltage (x1)
10D
R
3/4
16NS
1V
Frequency
10E
R
3/4
16NS
0.01 Hz
U21 phase to phase voltage (x10)
10F
R
3/4
16NS
1V
U32 phase to phase voltage (x10)
110
R
3/4
16NS
1V
U13 phase to phase voltage (x10)
111
R
3/4
16NS
1V
V1 phase to neutral voltage (x10)
112
R
3/4
16NS
1V
V2 phase to neutral voltage (x10)
113
R
3/4
16NS
1V
V3 phase to neutral voltage (x10)
114
R
3/4
16NS
1V
V0 residual voltage (x10)
Positive sequence voltage (x10)
115
116
R
R
3/4
3/4
16NS
16NS
1V
1V
3/4
Reserved
117/131
R
Reserved
132/1EF
Prohibited
init. to 0
Accuracy
Examples :
The accuracy of the measurements depends on the
order of the unit: it is equal to the value of the point
divided by 2.
I1
Unit = 1 A
Accuracy = 1/2 = 0.5 A
U21
Unit = 10 V
Accuracy = 1/2 = 0.5 A
Remote control zone
The remote control zone is a table which contains the pre-assigned remote control
bits (TC). The zone may be read or written using the word functions or bit functions.
See section on remote control orders.
Remote control bits
Word address
Bit address
Access
Modbus function
Format
enabled
TC1-TC16
01F0
1F00
R/W
STC1-STC16
Analog output control
01F1
01F2
1F10
R/W
R/W
3/4/6/16
1/2/5/15
3/4/6/16
1/2/5/15
3/4/6/16
B
B
16S
Protection setting zone
The protection setting zone is an exchange table which is used to read and set
protections.
Protection settings
Setting read buffer
Setting read request
Remote setting request buffer
See section on protection settings.
Word address
Access
2000/207C
2080
2100/217C
R
R/W
R/W
Modbus function
enabled
3
3/6/16
3/16
-
5/9
5
Modbus communication
Data addresses and encoding
Fault recorder zone
The fault recorder zone is an exchange table which is used to read records.
Disturbance recording
Choice of transfer function
Identification zone
Fault rec. exchange word
Fault rec. data
See section on fault recorder.
Word address
Access
2200/2203
2204/2228
2300
2301/237C
R/W
R
R/W
R
Modbus function
enabled
3/16
3
3/6/16
3
Test zone
The test zone is a 16-word zone that may be accessed via the communication link
by all the functions, in both read and write modes, to facilitate communication testing
at the time of commissioning or to test the link.
Test zone
Test
Word address
Bit address
Access
0C00
0C0F
C000-C00F
C0F0-C0FF
read/write
read/write
Modbus function
enabled
1, 2, 3, 4, 5, 6, 15, 16
1, 2, 3, 4, 5, 6, 15, 16
Format
none
none
init. to 0
init. to 0
Configuration zone
The configuration zone contains information pertaining to the hardware and
software configuration of the Sepam.
Configuration zone
5
Modbus address
(slave no.)
Sepam type (MSB) /
hardware config. (LSB)
Coupler type (MSB)/
version (LSB)
application identification
Word address
Access
Format
R
Modbus function
enabled
3
FC00
FC01
R
3
(1)
FC02
R
3
(2)
R
3
ASCII
12 characters
R
R
3
3
ASCII
ASCII
6 characters
20 characters
Type of application
FC10/15
(S20, M20, etc.)
application version
FC16/18
application marking
FC19/22
(1) FC01 word:MSB = 10h (Sepam )
LSB = hardware configuration
(2) FC02 word:MSB = 01h (Sepam )
LSB = XY (communicationversion X,Y)
Bit
Option
7
UD/UX
6
reserved
UX model
0
0
UX model
1
0
(3) or MET148.
x = 1 if option included
y = 1 if option included, exlusive options
z = 1 if Vac set up.
5/10
5
MES114E/
MES114F
z
z
4
DSM303
3
MSA141
2
MET148-2 (3)
1
MES114
0
MES108
x
0
x
x
x
x
y
y
y
y
Data addresses and encoding
Modbus communication
Data encoding
For all formats
If a measurement overruns the maximum permissible value for the related format, the
value read for the measurement will be the maximum permissible value for the
format.
Format16 NS
All information is encoded in a 16-bit word, in absolute value (unsigned), binary
format. The zero bit (b0) is the least significant bit in the word.
Format 16 S signed measurements (temperatures, …)
The information is encoded in a 16-bit word as a complement of 2.
Example:
b 0001 represents +1
b FFFF represents -1.
Format B: Ix
Rank i bit in the word, with i between 0 and F.
Examples
Logical
input
TS
1 to 16
TS
49 to 64
TC
1 to 16
STC
1 to 16
F
E
D
C
B
A
9
8
7
6
5
4
3
2
1
0
26
25
24
23
22
21
14
13
12
11
Word address 0105
Bit address 105x
Word address 0101
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bit address 101x
Word address 0104
Bit address 104x
Word address 01F0
Bit address 1F0x
Word address 01F1
5
Bit address 1F1x
Format X: Sepam check-word
This format applies only to the Sepam check-word that may be accessed at the word
address 100h. This word contains various items of information relating to:
b Sepam operating mode
b time-tagging of events.
Each data item contained in the Sepam check-word may be accessed bit by bit, from
address 1000 for the bit b0 to 100F for the bit b15.
b bit 15 event present
b bit 14 Sepam in “data loss” status
b bit 13 Sepam not synchronous
b bit 12 Sepam time not correct
b bit 11 reserved
b bit 10 Sepam in local setting mode
b bit 9
major fault in Sepam
b bit 8
partial fault in Sepam
b bit 7
setting group A in service
b bit 6
setting group B in service
b bit 3-0 mapping number (1 to 16).
Other bits reserved (undetermined values).
Status changes of bits 6, 7, 8, 10, 12, 13 and 14 of this word trigger the transmission
of a time-tagged event.
Bits 3 to 0 encode a “mapping number” (from 1 to 15) which is used to identify the
contents of the Modbus addresses, the assignment of which varies depending on the
application.
5/11
Modbus communication
Data addresses and encoding
Use of remote annunciation
Sepam provides the communication link with 64 remote annunciation bits (TS).
The TS are pre-assigned to protection and control functions which depend on the
Sepam model.
The TS can be read using the bit or word functions.
Each TS transition is time-tagged and stored in the event stack (see section on timetagging).
S20
T20
M20
1
TS Use
Protection 50/51 relay 1 group A
b
b
b
2
Protection 50/51 relay 2 group A
b
b
b
3
Protection 50/51 relay 1 group B
b
b
b
4
Protection 50/51 relay 2 group B
b
b
b
5
Protection 50N/51N relay 1 group A
b
b
b
6
Protection 50N/51N relay 2 group A
b
b
b
7
Protection 50N/51N relay 1 group B
b
b
b
8
Protection 50N/51N relay 2 group B
b
b
b
9
Protection 49 RMS alarm set point
b
b
10
Protection 49 RMS trip set point
b
b
11
Protection 37 (undercurrent)
12
Protection 46 (neg. seq/unbalance)
b
b
B21
B22
b
b
13
Protection 48/51LR (locked rotor)
b
14
Protection 48/51LR (rotor locking on start
b
15
Protection 48/51LR (excessive starting time)
b
16
Protection 66 (starts per hour)
b
Address word 102: TS 17 to 32 (bit address 1020 to 102F)
5
TS Use
5/12
B21
B22
17
Protection 27D (dir. undervoltage) relay 1
S20
T20
M20
b
b
18
Protection 27D (dir. undervoltage) relay 2
b
b
19
Protection 27 (ph.-to-ph. undervoltage) relay 1
b
b
20
Protection 27 (ph.-to-ph. undervoltage) relay 2
b
b
21
Protection 27R (remanent U/V) relay 1
b
b
22
Protection 59 (ph.-to-ph. overvoltage) relay 1
b
b
23
Protection 59 (ph.-to-ph. overvoltage) relay 2
b
b
24
Protection 59N (ph.-to-n. overvoltage) relay 1
b
b
25
Protection 59N (ph.-to-n. overvoltage) relay 2
b
b
26
Protection 81H (overfrequency)
b
b
27
Protection 81L (underfrequency) relay 1
b
b
28
Protection 81L (underfrequency) relay 2
b
b
29
Protection 27S (undervoltage) phase 1
b
b
30
Protection 27S (undervoltage) phase 2
b
b
31
Protection 27S (undervoltage) phase 3
b
b
32
Protection 81R (rate of change of frequency)
b
Modbus communication
Data addresses and encoding
Address word 103: TS 33 to 48 (bit address 1030 to 103F)
TS Use
33
S20
T20
M20
B21
B22
Reserved
34
Recloser in service
b
35
Recloser in progress
b
36
Recloser permanent trip
b
37
Recloser successful trip
b
38
Send blocking input
b
b
b
39
Remote setting inhibited
b
b
b
b
b
40
Remote control inhibited
b
b
b
b
b
41
Sepam not reset after fault
b
b
b
b
b
42
Remote control / position discrepancy
b
b
b
b
b
43
Matching fault or Trip Circuit Supervision
b
b
b
b
b
44
Disturbance recording memorized
b
b
b
b
b
45
Control fault
b
b
b
b
b
46
Disturbance recording inhibited
b
b
b
b
b
47
Thermal protection inhibited
b
b
48
RTD fault
b
b
B21
B22
Address word 104: TS 49 to 64 (bit address 1040 to 104F)
T20
M20
49
TS Use
Protection 49T alarm set point sensor 1
S20
b
b
50
Protection 49T tripping set point sensor 1
b
b
51
Protection 49T alarm set point sensor 2
b
b
52
Protection 49T tripping set point sensor 2
b
b
53
Protection 49T alarm set point sensor 3
b
b
54
Protection 49T tripping set point sensor 3
b
b
55
Protection 49T alarm set point sensor 4
b
b
56
Protection 49T tripping set point sensor 4
b
b
57
Protection 49T alarm set point sensor 5
b
b
58
Protection 49T tripping set point sensor 5
b
b
59
Protection 49T alarm set point sensor 6
b
b
60
Protection 49T tripping set point sensor 6
b
b
61
Protection 49T alarm set point sensor 7
b
b
62
Protection 49T tripping set point sensor 7
b
b
63
Protection 49T alarm set point sensor 8
b
b
64
Protection 49T tripping set point sensor 8
b
b
5
5/13
Modbus communication
Data addresses and encoding
Use of remote control orders
Address word 1F0: TC 1 to 16 (address bit 1F00 to 1F0F)
Remote control orders are pre-assigned to protection,
control and metering functions.
Remote control orders may be carried out in two
modes:
b direct mode
b confirmed SBO (select before operate) mode.
All the remote control orders may be inhibited by a
logical input, I25 on the MES114 module, except for the
remote control tripping order TC1 which can still be
activated at any time.
Logical input I25 may be set up according to 2 modes:
b inhibited if the input is set to 1 (“POS“ prefix)
b inhibited if the input is set to 0 (“NEG“ prefix).
The device tripping and closing and recloser enable
and disable remote control orders are acknowledged if
the “CB control“ function is validated and if the inputs
necessary for the logic are present (1).
Direct remote control order
The remote control order is executed when it is written
in the remote control word. The program logic resets it
to zero after the remote control order is acknowledged.
Confirmed SBO remote
control order (select before operate)
5
In this mode, remote control orders involve two steps:
b selection by the master of the order to be sent by
writing of the bit in the STC word and checking of the
selection by rereading the word
b execution of the order to be sent by writing of the bit
in the TC word.
The remote control order is executed if the bit in the
STC word and the bit in the associated word are set;
the program logic resets the bit STC and TC bits to zero
after the remote control order is acknowledged.
Deselection of the STC bit takes place:
b if the master deselects it by writing in the STC word
b if the master selects (write bit) a bit other than the
one already selected
b if the master sets a bit in the TC word which does not
match the selection. In this case, no remote control
order is executed.
(1) MES108 or MES114 modules.
5/14
Use
S20
T20
M20 B21
B22
1
TC
Tripping
b
b
b
b
b
2
Closing
b
b
b
b
b
3
Swtiching to setting group A
b
b
b
4
Switching to setting group B
b
b
b
5
Sepam reset (reset)
b
b
b
b
b
6
Peak demand current zero reset
b
b
b
b
b
7
8
9
10
11
12
13
14
15
16
Inhibit thermal protection
Inhibit disturbance recording triggering
Confirm disturbance recording triggering
Manual disturbance recording triggering
Enable recloser
Disable recloser
Confirm thermal protection
Reserved
Reserved
Reserved
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
Analog output remote control
The analog output of the MSA141 module may be set up for remote control via the
Modbus communication module (word address 1F2). The working range of the
numerical value transmitted is defined by the parameter setting of the "min. value"
and "max. value" of the analog output.
This function is not affected by remote control inhibition conditions.
Modbus communication
Time-tagging of events
Presentation
Initialization of the time-tagging function
Each time the communication system is initialized (energizing of Sepam), the events
are generated in the following order:
b appearance of "data loss"
b appearance of "incorrect time"
b appearance of "not synchronous"
b disappearance of "data loss".
The function is initialized with the current values of the remote annunciation and
logical input status without creating any events related to these data. After the
initialization phase, event detection is activated.
It can only be interrupted by saturation of the internal event storage queue or by the
presence of a major fault in Sepam.
The communication system time-tags the data
prcessed by Sepam. The time-tagging function assigns
a date and precise time to status changes so that they
can be accurately classified with over time. Timetagged data are events that can be processed in the
control room by the remote monitoring and control
system using the communication protocol for data
logging and chronological reports.
Sepam time-tags the following data:
b logical inputs
b remote annunciation bits
b information pertaining to Sepam equipment (see
Sepam check-word).
Time-tagging is carried out systematically.
Chronological sorting of the time-tagged events is
performed by the remote monitoring and control
system.
Time-tagging
Sepam time-tagging uses absolute time (see section
on date and time). When an event is detected, it is
tagged with the absolute time given by Sepam’s
internal clock.
All the Sepam internal clocks must be synchronized so
as to avoid drifts and all be the same to allow interSepam chronological sorting. Sepam has two
mechanisms for managing its internal clock:
b time-setting:
for initializing or modifying the absolute time. A special
Modbus message, called “time message”, is used to
time-set each Sepam
b synchronization:
to avoid Sepam internal clock drifts and ensure interSepam synchronization.
Internal clocks can be synchronized according to two
principles:
b internal synchronization:
via the communication network without any additional
cabling,
b external synchronization:
via a logical input with additional cabling.
At the time of commissioning, the user sets the
synchronization mode parameter.
Date and time
An absolute date and time are generated internally by Sepam, comprising the following
information: Year: Month: Day: Hour: minute: millisecond. The date and time format
is standardized (ref.: IEC870-5-4).
Sepam's internal clock is not saved; it needs to be time-set via the communication
network each time the Sepam is energized.
Sepam series 20's internal clock may be set in two different ways:
b by the remote monitoring and control system, via the Modbus link
b via the SFT2841 software, "general characteristics" screen.
The time that is tagged on events is encoded in 8 bytes as follows:
b15 b14 b13 b12 b11 b10 b09 b08 b07 b06 b05 b04 b03 b02 b01 b00 word
0
0
0
0
0
0
0
0
0
Y
Y
Y
Y
Y
Y
Y
0
0
0
0
M
M
M
M
0
0
0
D
D
D
D
D
word 1
word 2
0
0
0
H
H
H
H
H
0
0
mn
mn
mn
mn
mn
mn
word 3
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
word 4
Y - 1 byte for years: varies from 0 to 99 years.
The remote monitoring and control system must ensure that the year 00 is greater
than 99.
M - 1 byte for months: varies from 1 to 12.
D - 1 byte for days: varies from 1 to 31.
H - 1 byte for hours: varies from 0 to 23.
mn - 1 byte for minutes: varies from 0 to 59.
ms - 2 bytes for milliseconds: varies from 0 to 59999.
This information is encoded in binary form. Sepam is time-set via the “write word”
function (function 16) at the address 0002 with a mandatory 4-word time message.
The bits set to “0” in the description above correspond to format fields which are not
used and not generated by Sepam.
Since these bits can be transmitted to Sepam with random values, Sepam performs
the necessary disabling.
Sepam does not check the consistency or validity of the date and time received.
Synchronization clock
A synchronization clock is required for setting the date and time of Sepam.
Schneider Electric has tested the equipment sold by the following suppliers:
b Gorgy Timing, ref. RT 300, equipped with the M540 module
b SCLE, ref. RH 2000-B.
5/15
5
Modbus communication
Time-tagging of events
Reading of events
Exchange word
The exchange word is used to manage a special protocol to be sure not to lose
events following a communication problem. The event table is numbered for this
purpose.
The exchange word includes two fields:
b most significant byte = exchange number (8 bits): 0..255
Sepam provides the master or masters with two event
tables. The master reads the event table and
acknowledges by writing the exchange word.
Sepam updates its event table.
The events sent by Sepam are not sorted
chronologically.
Structure of the first event table:
b exchange word 0040h
b event number 1
0041h ... 0048h
b event number 2
0049h ... 0050h
b event number 3
0051h ... 0058h
b event number 4
0059h ... 0060h
5
Structure of the second event table:
b exchange word 0070h
b event number 1
0071h ... 0078h
b event number 2
0079h ... 0080h
b event number 3
0081h ... 0088h
b event number 4
0089h ... 0090h
The master necessarily reads a block of 33 words
starting at the address 0040h/0070h, or one word at
the address 0040h/0070h.
b15 b14
b13
b12
b11
b10
b09
b08
Exchange number: 0 .. 255
Description of the MS byte of the exchange word.
The exchange number contains a numbering byte which identifies the exchanges.
The exchange number is initialized to zero when Sepam is energized.
When it reaches its maximum value (FFh), it automatically returns to 0.
Sepam numbers the exchanges and the master acknowledges the numbering.
b least significant byte = number of events (8 bits): 0..4
b07 b06
b05
b04
b03
b02
b01
b00
Number of events: 0 .. 4
Description of LS byte of the exchange word.
Sepam indicates the number of significant events in the event table in the least
significant byte of the exchange word. Each non-significant event word is initialized
to zero.
Event table acknowledgment
To inform Sepam that the block read by the master has been correctly received, the
master writes the number of the last exchange made in the “Exchange number” field,
and resets the "Number of events" field of the exchange word to zero. After
acknowledgment, the 4 events in the event table are initialized to zero and the old,
acknowledged events are erased in Sepam.
Until the exchange word written by the master becomes “X,0” (with X = number of the
previous exchange that the master wishes to acknowledge), the exchange word in
the table remains at “X, number of previous events”.
Sepam only increments the exchange number when new events are present
(X+1, number of new events).
If the event table is empty, Sepam performs no processing operations when the
master reads the event table or the exchange word.
The data are encoded in binary form.
Sepam in data loss (1) / no data loss (0) status
Sepam has two internal storage queues with a capacity of 64 events. If one of the
queues becomes saturated, i.e. 63 events already present, the "data loss" event is
generated by Sepam in the 64th position, and event detection carries on.
The least recent events are lost to make room for the most recent ones.
Data loss is managed independently for each of the two event tables. When the
tables are read at different rates, data loss may occur at different times for each table
or even, in some cases, appear only on the slowest channel.
Note: the "data loss" bit of the Sepam check word corresponds to the status of the first reading
table (compatibility with earlier versions).
5/16
Modbus communication
Time-tagging of events
Description of event encoding
An event is encoded in 8 words with the following structure:
Most significant byte
Least significant byte
Word 1: type of event
08
00
For remote annunciation, internal data
logical inputs
Word 2: event address
Refer to bit addresses 1000 to 105F
Word 3: reserved
00
00
Word 4: falling edge: disappearance or rising edge: appearance
00
00
Falling edge
00
01
Rising edge
Word 5: year
00
0 to 99 (year)
Word 6: month-day
1 to 12 (month)
1 to 31 (day)
Word 7 : hours-minutes
0 to 23 (hours)
0 to 59 (minutes)
Word 8: milliseconds
0 to 59999
5
5/17
Modbus communication
Time-tagging of events
DE50337
Synchronization
Sepam accommodates two synchronization modes:
b "internal via the network" synchronization mode by the broadcasting of a "time
message" frame via the communication network. Slave number 0 is used for
broadcasting
b "external" synchronization mode via a logic input.
The synchronization mode is selected at the time of commissioning via SFT2841.
Internal synchronization via the network mode
The “time message" frame is used for both time-setting and synchronization of
Sepam. In this case, it must be sent regularly at brief intervals (between 10 and
60 seconds) in order for synchronous time to be obtained.
Sepam’s internal clock is reset each time a new time frame is received, and
synchronization is maintained if the reset amplitude is less than 100 milliseconds.
With internal synchronization via the network, accuracy is linked to the master and
its mastery of time frame transmission in the communication network.
Sepam is synchronized without delay at the end of the receipt of the frame.
Time changes are made by sending a frame to Sepam with the new date and time.
Sepam then switches into a transitional non-synchronous status.
When Sepam is in synchronous status, if no "time message” is received
for 200 seconds, the appearance of the “not synchronous” event is triggered.
Architecture for "internal synchronization" via the
communication network.
5
5/18
Modbus communication
Time-tagging of events
DE50338
Synchronization (cont’d)
External synchronization via a logic input mode
Sepam can be synchronized externally by means of a logic input (I21) (the MES114
module is required).
Synchronization is carried out on the rising edge of the logic input.
Sepam can adapt to all synchronization "logical time pulse" periods from
10 to 60 s, by 10 s steps.
The shorter the synchronization period, the more accurate time-tagging of status
changes is.
The first time frame is used to initialize Sepam with the absolute date and time (the
following frames are used for the detection of any time changes).
The synchronization "logical time pulse" is used to reset Sepam’s internal clock. In
the initialization phase, when Sepam is in "non-synchronous" mode, resetting is
allowed, within an amplitude of ±4 seconds.
In the initialization phase, the resetting process (switching of Sepam into
"synchronous" mode) is based on a measurement of the difference between
Sepam’s current time and the nearest ten second period. This measurement is taken
at the time of the receipt of the "logical time pulse" following the initialization time
frame. Resetting is allowed if the difference is less than or equal to 4 seconds, in
which case Sepam switches to "synchronous" mode.
As of that time (after the switching to "synchronous" mode), the resetting process is
based on the measurement of a difference (between Sepam’s current time and the
nearest ten second period at the time of the receipt of a "logical time pulse"), which
is adapted to match the "logical time pulse" period.
Architecture for "external synchronization" via a logic input.
The "logical time pulse" period is determined automatically by Sepam when it
is energized, based on the first two pulses received: the "logical time pulse"
must therefore be operational before Sepam is energized.
The synchronization function only operates after Sepam has been time-set, i.e.
after the disappearance of the "incorrect time" event.
Any time changes greater than ±4 seconds in amplitude are made by sending a new
time frame. The switch from summer time to winter time (and vice versa) is made in
this way as well.
There is a temporary loss of synchronism when the time is changed.
The external synchronization mode requires additional equipment, a
"synchronization clock " to generate a precise periodic synchronization time pulse.
If Sepam is in "correct time and synchronous" status, and if the difference in
synchronism between the nearest ten second period and the receipt of the
synchronization time pulse is greater than the synchronism error for 2 consecutive
synchronization time pulses, it switches into non-synchronous status and generates
the appearance of a "not synchronous" event.
Likewise, if Sepam is in "correct time and synchronous" status, the failure to receive
a synchronization time pulse for 200 seconds generates the appearance of a "not
synchronous" event.
5/19
5
Modbus communication
Time-tagging of events
Reading of remote settings (remote reading)
Settings accessible for remote reading
Reading of the settings of all the protection functions may be accessed remotely.
Exchange principle
Remote reading of settings takes place in two steps:
b first of all, the master indicates the code of the function for which it wishes to know
the settings by means of a "request frame". The request is acknowledged, in the
Modbus sense of the term, to free the network
b the master then reads a reply zone to find the required information by means of a
"reply frame".
Each function has its own particular reply zone contents. The time needed between
the request and the reply is linked to Sepam’s low priority cycle time and may vary
by several tens to several hundreds of ms.
Request frame
The request is made by the master using a "write word" (code 6 or 16) operation at
the address 2080h of a 1-word frame consisting of the following:
2080h
B15 B14 B13 B12 B11 B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00
Function code
Relay number
The content of the address 2080h may be read using a Modbus "read word" (code 3).
The function code field may have the following values:
b 01h to 99h (BCD encoding) for protection functions.
The relay number field is used as follows:
b for protection, it indicates the relay involved, varying from 1 to N, N being the
maximum number of relays available in the Sepam
b when only one relay is available, this number field is not controlled.
Exception replies
In addition to the usual cases, Sepam can send Modbus type 07 exception replies
(not acknowledged) if another remote reading request is being processed.
5
Reply frame
The reply, sent back by the Sepam, fits into a zone containing a maximum of 125
words at the address 2000h which is composed the following:
2000h/207Ch
B15 B14 B13 B12 B11 B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00
Function code
Relay number
Settings
..............
(special field for each function)
..............
This zone is read by a "read word" operation (code 3) at the address 2000h.
The length of the exchange may include:
b the first word only (validity test)
b the maximum size of the zone (125 mots)
b the usable size of the zone (determined by the function being addressed).
However, reading must always begin at the first word in the zone (any other address
triggers an exception reply "incorrect address").
The first word in the zone (function code and relay number) may have the following
values:
xxyy: with
b function code xx different from 00 and FFh
b relay number yy different from FFh.
The settings are available and validated. They word is a copy of the "request frame".
The zone contents remain valid until the next request is made.
The other word are not significant.
b FFFFh: the "request frame" has been processed, but the results in the
"reply frame" are not yet available. It is necessary to repeat "reply frame" reading.
The other words are not significant.
b xxFFh: with function code xx different from 00 and FFh. The function for which the
remote reading request has been made is not valid. The function is not included in
the particular Sepam, or remote reading of it is not authorized: refer to the list of
functions which accommodate remote reading of settings.
5/20
Modbus communication
Access to remote settings
Remote setting
Data that can be remotely set
Writing of the settings of all the protection functions may be accessed remotely.
Exchange principle
Remote setting is allowed for Sepam units.
Remote setting is carried out for a given function, relay by relay.
It takes place in two steps:
b first of all, the master indicates the function code and relay number, followed by the
values of all the settings in the a "write request frame". The request is acknowledged
to free the network
b the master then reads a reply zone to find the required information by means of a
"reply frame", a reply zone designed for checking that the settings have been
processed. Each function has its own particular reply zone contents. The contents
are same as those of the reply frame.
To use remote setting, it is necessary to make all the settings for the function
concerned, even if some of them have not changed.
Request frame
The request is made by the master using a "write n words" (code 16) operation at the
address 2100h. The zone to be written contains a maximum of 125 words.
It contains the values of all the settings. It consists of the following:
2100h
B15 B14 B13 B12 B11 B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00
Function code
Relay number
Settings
..............
(special field for each function)
..............
The content of the address 2100h may be read using a "read n words" (code 3).
The function code field may have the following values:
b 01h to 99h (BCD encoding) for the list of protection functions F01 to F99.
The relay number field is used as follows:
b for protection, it indicates the relay involved, varying from 1 to N, N being the
maximum number of relays available in the Sepam. It may never be equal to 0.
Exception reply
In addition to the usual cases, Sepam can send type 07 exception replies
(not acknowledged) if:
b another remote reading or setting request is being processed
b the remote setting function is inhibited.
5/21
5
Modbus communication
Access to remote settings
Reply frame
The reply sent back by the Sepam is the same as the remote reading reply frame. It
fits into a zone containing a maximum of 125 words at the address 2000h and is
composed of the effective settings of the function following a semantic check:
2000h-207Ch
B15 B14 B13 B12 B11 B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00
Function code
Relay number
Settings
..............
(special field for each function)
..............
This zone is read by a "read n words" operation (code 3) at the address 2000h.
The length of the exchange may unclude:
b the first word only (validity test)
b the maximum size of the reply zone (125 words)
b the usable size of the reply zone (determined by the function being addressed).
However, reading must always begin at the first word in the address zone
(any other address triggers an exception reply "incorrect address").
The first word in the reply zone (function code and relay number) has the same
values as those described for the remote reading reply frame.
b xxyy: with:
v function code xx different from 00 and FFh
v relay number yy different from FFh.
The settings are available and validated. The word is a copy of the "request frame".
The zone contents remain valid until the next request is made.
b 0000h: no "request frame" has been formulated yet, as it is the case, in particular,
when the Sepam is switched on.
The other words are not significant.
b FFFFh: the "request frame" has been processed, but the results in the "reply
frame" are not yet available. It is necessary to repeat "reply frame" reading. The other
words are not significant.
b xxFFh: with function code xx different from 00 and FFh. The function for which the
remote reading request has been made is not valid. The function is not included in
that particular Sepam, or access to settings is impossible, both in read and write
mode.
5
5/22
Modbus communication
Access to remote settings
Description of settings
Data format
All the settings are transmitted in signed 32-bit whole number form
(encoding, as a complement of 2).
Particular setting value:
7FFF FFFFh means that the setting is outside the validity range.
1 The Enabled or Disabled setting is encoded as follows:
0 = Disabled, 1 = Enabled
2 The tripping curve setting is encoded as follows:
0 = definite
1 = standard inverse time
9 = IEC VIT/
2 = long time inverse
10 = IEC EIT/C
3 = very inverse time
11 = IEEE Mod. inverse
4 = extremely inverse time
12 = IEEE Very inverse
5 = ultra inverse time
13 = IEEE Extr. inverse
6 = RI
14 = IAC inverse
7 = IEC SIT/A
15 = IAC very inverse
8 = IEC LTI/B
16 = IAC extr. inverse
3 The setting of the holding time curve is encoded as follows:
0 = definite time
1 = IDMT
4 The H2 restraint variable is encoded as follows:
0 = H2 restraint
1 = no H2 restraint
5 The tripping curve setting is:
0 = definite time
1 = IDMT
6 The negative sequence factor is:
0 = None (0)
1 = Low (2.25)
2 = Average (4.5)
3 = High (9)
7 Acknowledgment of the ambient temperature is encoded as follows:
0 = No
1 = Yes
8 Not used
9 The inhibition input setting is encoded as follows:
0 = No inhibition
1 = Inhibit recloser by logical input I26
10 Not used
11 The activation mode of each of the cycles is encoded as follows:
Correspondence between bit position and protection according to the table below:
Bit
0
Activation by
Inst O/C 1
1
Time-delayed O/C 1
2
Inst O/C 2
3
Time-delayed O/C 2
4
Inst E/F 1
5
Time-delayed E/F 1
6
Inst E/F 2
7
Time-delayed E/F 2
The bit status is encoded as follows:
0 = No activation by the protection
1 = Activation by the protection.
5/23
5
Modbus communication
Access to remote settings
General characteristics settings (read only)
Function number: 3002
5
5/24
Setting
1
Data
Rated frequency
2
3
Remote setting enabled
Sepam working language
4
5
Number of period before
disturbance recording
Active setting groupe
6
Setting mode
7
Type of phase current sensor
8
Number of CTs
9
10
11
Rated current
Base current
Residual current mode
12
13
Rated residual current Ino
Integration period
14
15
16
Reserved
Rated primary voltage Unp
Rated secondary voltage Uns
17
Voltages mesured by VTs
18
Residual voltage mode
Format/Unit
0 = 50 Hz
1 = 60 Hz
1 = disabled
0 = English
1 = Customized language
1
0 = Setting group A
1 = Setting group B
2 = setting group A and B
3 = Choice by input I13
4 = Choice by remote control
5 = Logic discrimination
0 = TMS
1 = 10I/Is
0 = TC 5 A
1 = TC 1 A
2 = LPTC
0 = 3 TC (I1, I2, I3)
1 = 2 TC (I1, I3)
A
A
0 = 3I sum
1 = 2 A rated CSH
2 = 20 A rated CSH
3 = 1 A CT + CSH
4 = 5 A CT + CSH
5 = ACE990 Range 1
6 = ACE990 Range 2
A
0 = 5 mn
1 = 10 mn
2 = 15 mn
3 = 30 mn
4 = 60 mn
V
0 = 100 V
1 = 110 V
2 = 115 V
3 = 120 V
4 = 200 V
5 = 230 V
0 = 3 V (V1, V2, V3)
1 = 2 U (U21, U32)
2 = 1 U (U21)
0 = None
1 = 3 V sum
2 = external VT – Uns/3
3 = external VT – Uns/3
Modbus communication
Access to remote settings
Phase current protection settings
Function number: 01xx
Relay 1: xx = 01
Relay 2: xx = 02
Setting
1
Data
Reserved
2
Group A - tripping curve
3
Group A - threshold current
4
Group A - tripping time delay
5
6
7
8
9
10
11
Group A - holding time curve
Group A - holding time
Reserved
Reserved
ON/OFF
Group B - tripping curve
Group B - threshold current
12
13
14
15
16
Group B - tripping time delay
Group B - holding time
Group B - holding time
Reserved
Reserved
Format/Unit
2
0.1 A
10 ms
3
10 ms
1
2
0.1 A
10 ms
3
10 ms
Earth fault protection settings
Function number: 02xx
Relay 1: xx = 01
Relay 2: xx = 02
Setting
1
Data
Reserved
2
Group A - tripping curve
3
Group A - threshold current
4
Group A - tripping time delay
5
Group A - holding time
6
7
8
9
10
11
Group A - holding time
Group A - H2 restraint
Reserved
ON/OFF
Group B - tripping curve
Group B - threshold current
12
13
14
15
16
Group B - tripping time delay
Group B - holding time
Group B - holding time
Group B - H2 restraint
Reserved
Format/Unit
2
0.1 A
10 ms
5
3
10 ms
4
1
2
0.1 A
10 ms
3
10 ms
4
Negative sequence / unbalance protection settings
Function number: 0301
unit 1: xx = 01 to unit 2: xx = 02
Setting
1
Data
Enable or disabled
2
Tripping curve
3
Threshold current
4
Tripping time delay
Format/Unit
1
5
% Ib
10 ms
5/25
Modbus communication
Access to remote settings
Thermal overload protection settings
Function number: 0401
Setting
1
Data
Enable or disabled
Format/Unit
1
2
Negative sequence factor
3
4
Current threshold for switching from group A/group B
Accounting for ambient temperature
6
% Ib
5
6
7
Maximum equipment temperature
Reserved
Reserved
8
9
10
11
12
13
14
15
16
17
18
Group A - heatrise alarm set point
Group A - heatrise tripping set point
Group A - heating time constant
Group A - cooling time constant
Group A - initial heatrise value
Group B - enabled or disabled
Group B - heatrise alarm set point
Group B - heatrise tripping set point
Group B - heating time constant
Group B - cooling time constant
Group B - initial heatrise value
7
°C
%
%
minutes
minutes
%
1
%
%
minutes
minutes
%
Phase undercurrent protection settings
Function number: 0501
Setting
1
Data
Enabled or disabled
2
3
Threshold current
Tripping time delay
Format/Unit
1
% lb
10 ms
Locked rotor, excessive starting time protection settings
Function number: 0601
5
Setting
1
2
3
4
5
Data
Enabled or disabled
Threshold current
Excessive starting time delayB (ST)
Locked rotor time delay (LT)
Locked rotor on start time delay (LTS)
Format/Unit
1
%
10 ms
10 ms
10 ms
Starts per hour protection settings
Function number: 0701
5/26
Setting
1
Data
Enabled or disabled
2
Period of time
Format/Unit
1
hours
3
Total number of starts
1
4
5
6
Number of consecutive hot starts
Number of consecutive starts
Time delay between starts
1
1
minutes
Modbus communication
Access to remote settings
Positive sequence undervoltage protection settings
Function number: 08xx
Relay 1: xx = 01
Relay 2: xx = 02
Setting
1
Data
Enabled or disabled
Format/Unit
2
Threshold voltage
1
% Unp
3
Tripping time delay
10 ms
4 to 8
Reserved
Remanent undervoltage protection setting
Function number: 0901
Setting
1
2
3
4 to 8
Data
Enabled or disabled
Threshold voltage
Tripping time delay
Reserved
Format/Unit
1
% Unp
10 ms
Phase-to-phase undervoltage protection settings
Function number: 10xx
Relay 1: xx = 01
Relay 2: xx = 02
Setting
1
Data
Enabled or disabled
Format/Unit
2
Threshold voltage
1
% Unp
3
Tripping time delay
10 ms
4 to 8
Reserved
Phase-to-neutral undervoltage protection settings
Function number: 1801
Setting
1
2
3
4 to 8
Data
Enabled or disabled
Threshold voltage
Tripping time delay
Reserved
5
Format/Unit
1
% Vnp
10 ms
Phase-to-phase overvoltage protection settings
Function number: 11xx
Relay 1: xx = 01
Relay 2: xx = 02
Setting
1
Data
Enabled or disabled
Format/Unit
2
Threshold voltage
1
% Unp
3
Tripping time delay
10 ms
4 to 8
Reserved
5/27
Modbus communication
Access to remote settings
Neutral voltage displacement protection settings
Function number: 12xx
Relay 1: xx = 01
Relay 2: xx = 02
Setting
1
Data
Enabled or disabled
Format/Unit
2
Threshold voltage
1
% Unp
3
Tripping time delay
10 ms
4 to 8
Reserved
Overfrequency protection settings
Function number: 1301
Setting
1
2
3
Data
Enabled or disabled
Threshold frequency
Tripping time delay
Format/Unit
1
0.1 Hz
10 ms
Underfrequency protection settings
Functioën number: 14xx
Relay 1: xx = 01
Relay 2: xx = 02
Setting
1
2
3
4 to 8
Data
Enabled or disabled
Threshold voltage
Tripping time delay
Reserved
Format/Unit
1
0.1 Hz
10 ms
Rate of change of frequency protection settings
Function number: 1601
5
5/28
Setting
1
Data
Enabled or disabled
Format/Unit
1
2
Slip threshold
0.1 Hz/s
3
Tripping time delay
10 ms
4 to 8
Reserved
Modbus communication
Access to remote settings
Temperature monitoring protection settings
Function number: 15xx
Relay 1 : xx = 01
Relay 2 : xx = 02
Relay 3 : xx = 03
Relay 4 : xx = 04
Relay 5 : xx = 05
Relay-6 : xx = 06
Relay 7 : xx = 07
Relay 8 : xx = 08
Setting
1
Data
Enabled or disabled
Format/Unit
2
Alarm set point
1
°C
3
Trip set point
°C
4 to 8
Reserved
Recloser function settings
Function number: 1701
Setting
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Data
Recloser – enabled or disabled
Recloser inhibition by input I26
Number of cycles
Recloser – disengaging time delay
Recloser – inhibition time delay
Reserved
Cycle 1 – activation mode
Cycle 1 – isolation time delay
Reserved
Cycle 2 – activation mode
Cycle 2 – isolation time delay
Reserved
Cycle 3 – activation mode
Cycle 3 – isolation time delay
Reserved
Cycle 4 – activation mode
Cycle 4 – isolation time delay
Format/Unit
1
9
1 to 4
10 ms
10 ms
11
10 ms
11
10 ms
5
11
10 ms
11
10 ms
5/29
Modbus communication
Disturbance recording
Presentation
Reading the identification zone
Given the volume of data to be transmitted, the master must ensure that there are
data to be recovered and prepare the exchanges when necessary.
The identification zone, described below, is read by the reading of N words starting
at the address 2204h:
b 2 reserve words forced to 0
b size of record configuration files encoded in 1 word
b size of record data files encoded in 1 words
b number of records encoded in 1 word
b date of record (most recent) encoded in 4 words (see format below)
b date of record (least recent) encoded in 4 words (see format below)
b 24 reserve words.
All of these data are consecutive.
The disturbance recording function is used to record
analog and logical signals during a time interval.
Sepam series 20 can store two records.
Each record comprises two files:
b configuration file with suffix .CFG
b data file with suffix .DAT.
The data of each record may be transferred via the
Modbus link. It is possible to transfer 1 or 2 records to a
remote monitoring and control system. The record may
be transferred as many times as possible, until it is
overwritten by a new record.
If a record is made by Sepam while the oldest record is
being transferred, the oldest record is altered.
If a command (e.g. a remote reading or remote setting
request) is carried out during the transfer of a
disturbance recording record, the record is not
disturbed.
Time-setting
Each record can be dated.
Time-setting of Sepam is described in the "Timetagging of events" section.
Transferring records
5
The transfer requests are made record by record, i.e.
one configuration file and one data file per record.
The master sends the commands in order to:
b find out the characteristics of the records stored in an
identification zone
b read the contents of the different files
b acknowledge each transfer
b reread the identification zone to ensure that the
record still appears in the list of records available.
Reading the contents of the different files
Request frame
The master makes the request by writing the date of the record to be transferred
(code 16) in 4 words starting at the address 2200h.
It should be noted that requesting a new record amounts to stopping the transfers
which are in progress. This is not the case for an identification zone transfer request.
2200h
B15
B14 B13 B12 B11 B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00
O
O
O
O
O
O
O
O
Y
Y
Y
Y
Y
Y
Y
O
O
O
O
M
M
M
M
O
O
O
D
D
D
D
D
O
O
O
H
H
H
H
H
O
O
mn
mn
mn
mn
mn
mn
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
Y
Y - 1 byte for years: varies from 0 to 99 years.
The master must ensure that the year 00 is greater than 99.
M - 1 byte for months: varies from 1 to 12.
D - 1 byte for days: varies from 1 to 31.
H - 1 byte for hours: varies from 0 to 23.
mn - 1 byte for minutes: varies from 0 to 59.
ms - 2 bytes for milliseconds: varies from 0 to 59999.
Reply frame
Reading of each portion of configuration and data file records by a reading frame
(code 3) of 125-words starting at the address 2300h.
2300h
B15 B14 B13 B12 B11 B10 B09 B08 B07 B06 B05 B04 B03 B02 B01 B00
Number of usable bytes
in the data zone
Exchange number
..............
Data zone
..............
Reading should always begin with the first word in the address zone (any other
address triggers an exception reply "incorrect address").
The configuration and data files are read in their entirety in Sepam. They are
transferred adjacently.
5/30
Modbus communication
Disturbance recording
If the master requests more exchanges than necessary, the exchange number
remains unchanged and the number of usable bytes is forced to 0. To guarantee the
data transfers, it is necessary to allow a response time of about 500 ms between
each reading operation at 2300h.
The first word transmitted is an exchange word. The exchange word comprises two
fields:
b the most significant byte contains the exchange number. It is incremented by 1 by
the Sepam each time a successful transfer takes place. When it reaches the value
FFh, it automatically goes back to zero
b the least significant byte contains the number of usable bytes in the data zone. It
is initialized to zero after energizing and must be different from FFh.
The exchange word may also have the following values:
b xxyy: the number of usable bytes in the data zone yy must be different from FFh
b 0000h: no "read requeste frame" has been formulated yet, as it is the case in
particular, when the Sepam is switched on. The other words are not significant,
b FFFFh: the "request frame" has been processed, but the results in the reply zone
are not yet available.
It is necessary to repeat "reply frame" reading.
The other words are not significant.
The words which follow the exchange word make up the data zone.
Since the configuration and data files are adjacent, a frame may contain the end of
the configuration file and the beginning of the data file of a record.
It is up to the remote monitoring and control system software to reconstruct the files
in accordance with the transmitted number of usable bytes and the size of the files
indicated in the identification zone.
Acknowledging a transfer
To inform the Sepam that a record block that it has just read has been received
correctly, the master must write the number of the last exchange that it has carried
out in the "exchange number" filed and set the "number of usable bytes in the data
zone" of the exchange word to zero.
The Sepam only increments the exchange number if new acquisition bursts are
present.
Rereading the identification zone
To ensure that the record has not been modified, during its transfer by a new record,
the master rereads the contents of the identification zone and ensures that the
recovered record date is still present.
5/31
5
Modbus communication
5
5/32
Installation
Contents
Equipment identification
6/2
Precautions
6/4
Base unit
Assembly
Mounting of the remote advanced UMI DSM303
Connection
Connection of current input
Other current input connection schemes
Other residual current input connection schemes
Connection of voltage inputs
Other voltage input connection schemes
6/5
6/5
6/7
6/8
6/9
6/10
6/11
6/12
6/13
Current transformers 1 A/5 A
6/14
Capteurs courant type LPCT
6/15
Core balance CTs CSH120 and CSH200
6/16
Tore homopolaire adaptateur CSH30
6/17
ACE990 interface
6/18
Voltage transformers
6/19
MES114 modules
6/20
Optional remote modules
Connection
6/22
6/22
Temperature sensor modules MET148-2
6/23
Analog output module MSA141
6/24
2-wire RS 485 network interface ACE949-2
6/25
4-wire RS 485 network interface ACE959
6/26
Fiber optic interface ACE937
6/27
6
6/1
Equipment identification
Installation
Identification of the base unit
Each Sepam comes in a single package which contains the base unit and the base
unit 20-pin connector (CCA620 or CCA622).
The other optional accessories such as mdoules, current or voltage input connectors
and cords come in separate packages.
To identify a Sepam, check the 2 labels on the right side panel of the base unit which
describe the product’s functional and hardware features.
b hardware reference and designation
DE50531
Model
User Machine Interface
Supply voltage
MT10451
b functional reference and designation
Substation / Sous-station
Type of application
English/French
Working language
Modbus
0031412
C04
{
S10 UX S20 J33 XXX
Additional
information
(not given systematically)
Identification of accessories
6
The accessories such as optional modules, current or voltage connectors and
connection cords come in separate packages, identified by labels.
b example of MES114 module identification label :
MT10448
Part number
Commercial reference
6/2
Installation
Equipment identification
List of Sepam series 20 references
Reference
59603
59607
59608
Designation
Base unit with basic UMI, 24-250 V DC and 100-240 V AC power supply *
Base unit with advanced UMI, 24-250 V DC and 100-240 V AC power supply *
DSM303, remote advanced UMI module
59609
59611
Working language English/French
Working language English/Spanish
59620
59621
59622
59624
59625
Substation application type S20
Transformer application type T20
Motor application type M20
Busbar application type B21
Busbar application type B22
59630
59631
59632
CCA630 connector for 1A/5A CT current sensors
CCT640 connector for LPCT current sensors
CCA670 connector for VT voltage sensors
59634
59635
59636
CSH30 interposing ring CT for Io input
CSH120 residual current sensor, diameter 120 mm
CSH200 residual current sensor, diameter 200 mm
59641
59642
59643
MET148-2 8-temperature sensor module
ACE949-2-wire RS 485 network interface
ACE959 4-wire RS 485 network interface
59644
59646
59647
59648
59649
59650
59651
59652
ACE937 optical fibre interface
MES114 10 input + 4 output module / 24-250 V DC *
MSA141 1 analog output module
ACE909-2 RS 485/RS 232 convertor
ACE919 AC RS 485/RS 485 interface (AC power supply)
ACE919 DC RS 485/RS 485 interface (CC power supply)
MES114E 10 input + 4 output module / 110-125 V DC and V AC
MES114F 10 input + 4 output module / 220-250 V DC and V AC
59660
59661
59662
59663
59664
59666
59667
CCA770 remote module cord, L = 0.6 m
CCA772 remote module cord, L = 2 m
CCA774 remote module cord, L = 4 m
CCA612 RS 485 network interface communication cord, L = 3 m
CCA783 PC connection cord
CCA613 LPCT remote test plug
ACE917 LPCT injection adapter
59668
59669
59670
59671
59672
59676
CCA620 20-pin screw type connector
CCA622 20-pin ring lug connector
AMT840 mounting plate
SFT2841 PC configuration software kit, with CCA783 cord
ACE990 core balance CT interface for Io input
2640 kit with 2 sets of spare connectors
6
Note: list of references cancelled and replaced:
- 59602 (base unit with basic UMI, 24 V DC power supply) cancelled and replaced by reference
59603
- 59606 (base unit with advanced UMI, 24 V DC power supply) cancelled and replaced by
reference 59607
- 59645 (MES108 4I/4O module) cancelled and replaced by 59646.
6/3
Precautions
Installation
Environment of the installed Sepam
We recommend that you follow the instructions given in
this document for quick, correct installation of your
Sepam:
b equipment identification
b assembly
b connection of current and voltage inputs, probes
b connection of power supply
b checking prior to commissioning.
Operation in a damp environment
The temperature/relative humidity factors must compatible with the unit’s
environmental withstand characteristics.
If the use conditions are outside the normal zone, commissioning arrangements
should be made, such as air conditioning of the premises.
MT11149
Installation of Sepam
Handling, transport and storage
Sepam in its original packaging
Transport:
Sepam may be shipped to any destination without
talking any additional precautions by all usual means of
transport.
Handling:
Sepam may be handled without any particular care and
can even withstand being dropped by a person
handling it (person standing on floor).
Storage:
Sepam may be stored in its original packaging, in an
appropriate location for several years:
b temperature between -25 °C and +70 °C
b humidity y 90 %.
Periodic, yearly checking of the environment and the
packaging condition is recommended.
Once Sepam has been unpacked, it should be
energized as soon as possible.
Sepam installed in a cubicle
Transport:
Sepam may be transported by all usual means of
transport in the customary conditions used for cubicles.
Storage conditions should be taken into consideration
for a long period of transport.
6
Handling:
Should the Sepam fall out of a cubicle, check its
condition by visual inspection and energizing.
Storage:
Keep the cubicle protection packing for as long as
possible. Sepam, like all electronic units, should not be
stored in a damp environment for more than a month.
Sepam should be energized as quickly as possible. If
this is not possible, the cubicle reheating system should
be activated.
6/4
Operation in a polluted atmosphere
Sepam is designed to be used in a clean industrial environment as defined by
IEC 60654-4 class 1. A contaminated industrial atmosphere components (such as
the presence of chlorine, hydrofluoric acid, sulfur, solvents...) may cause corrosion
of the electronic components, in which case environmental control arrangements
should be made (such as closed, pressurized premises with filtered air, ...) for
commissioning.
Base unit
Assembly
Installation
MT10896
Mounting of the Sepam base unit
The Sepam is simply flush-mounted and clamped, without requiring any additional
screw type fastening.
1 Present the product as
mounting
clamp
indicated, making sure the metal
plate is correctly entered in the
groove at the bottom.
2 Tilt the product and press on
the top part to clamp it with the
clips.
slot
Side view
MT11151
MT11150
Flush mounting in top panel
Assembly shown with advanced UMI
and optional MES114 module.
Weight = approx. 1.6 kg (with option)
Weight = approx. 1.2 kg (without option)
Top view
6
Cut-out
0.2
MT10461
162
202
0.2
Mounting plate thickness < 3 mm.
6/5
Base unit
Assembly
Installation
"Terminal block" assembly with AMT840 plate
Used to mount Sepam at the back of the compartment with access to connectors on
the rear panel.
Assembly associated with the use of the remote advanced UMI (DSM303).
MT10332
6.5
40
40
230
40
40
40
15
216
236
176
123
6
6/6
98
Base unit
Mounting of the remote advanced
UMI DSM303
Installation
Mounting of the DSM303 module in the front panel
DE50562
The module is simply flush-mounted without requiring any additional screw type
fastening.
The supplied seal must be mounted if a NEMA12 enclosure rating is required.
T
I on
ff
0o
SF6
1
I>>5
51N
Io>
51N
Io>>
ext
I>51
on
et
res
r
clea
Weight approximately 0.3 kg.
The depth with the connection cord is less than 30 mm.
Cut-out
0.2
MT10462
144
98.5
6
0.5
Cut-out dimensions for flush mounting
(mounting plate thickness < 3 mm).
Side view
MT10463
mounting clip
lateral outlet
96
117
15
maximum depth
with cable: 25
6/7
Base unit
Connection
Installation
Sepam components
MT10457
b base unit 1
v A base unit connector:
- power supply,
- output relay,
- CSH30, 120, 200 or ACE990 input.
Screw-type connector shown (CCA620), or ring lug connector (CCA622)
v B 1/5 A CT current input connector (CCA630) or LPCT current input connector
(CCA670) or voltage input connector (CCT640)
v C communication module link connection (green)
v D remote inter-module link connection (black)
b optional input/output module 2 (MES108 or MES114)
v L M MES108 or MES114 module connectors
v K MES114 module connector.
1
2
L
12
11
O14
9
8
O13
6
5
O12
3
2
O11
B
A
CSH
19
18
17
15
14
13
K
M
11
10
8
7
6
I14 I26
I25
I24
I13 I23
I22
5
4
I12
2
1
I11 I21
10
9
8
7
6
5
4
2
1
O4
11
10
O3
8
7
O2
5
4
O1
2
1
-/
+/
D
C
Connection of the base unit
A
MT10478
base
The Sepam connections are made to the removable connectors located on the rear
panel. All the connectors are screw-lockable.
O1
5
4
For safety reasons (access to dangerous potentials), all the terminals must be
screwed tight, whether or not they are used.
O2
8
7
O3
11
10
Wiring of the CCA620 connector:
b without fitting:
v 1 wire with maximum cross-section of 0.2 to 2.5 mm2 (u AWG 24-12) or 2 wires
with maximum cross-section of 0.2 to 1 mm2 (u AWG 24-16)
v stripped length: 8 to 10 mm
b with fitting:
v recommended wiring with Telemecanique fitting:
- DZ5CE015D for 1 wire 1.5 mm2
- DZ5CE025D for 1 wire 2.5 mm2
- AZ5DE010D for 2 wires 1 mm2
v tube length: 8.2 mm
v stripped length: 8 mm.
O4
15
14
13
1
2
17
+/~
–/~
Wiring of the CCA622 connector:
b ring lug connectors 6.35 mm (1/4").
Characteristics of the 4 base unit relay outputs O1, O2, O3, O4.
b O1 and O2 are 2 control outputs, used by the breaking device control function for:
v O1: breaking device tripping
v O2: breaking device closing inhibition
b O3 and O4 are indication outputs, only O4 may be activated by the watchdog
function.
6/8
Base unit
Connection of current input
DE50532
Installation
S20 / T20 / M20 types
Connection to 1 A / 5 A current sensors
Type
Ref.
Cable
A
Connector
Screw-type
CCA620
1 wire 0.2 to 2.5 mm2
(u AWG 24-12)
2 wires 0.2 to 1 mm2
(u AWG 24-16)
B
Ring lug 6.35 mm
Ring lug 4 mm
CCA622
CCA630
C
D
RJ45
RJ45
1.5 to 6 mm2
(AWG 16 to AWG 10)
CCA612
CCA770: L = 0.6 m
CCA772: L = 2 m
CCA774: L = 4 m
6/9
6
Installation
Base unit
Other current input connection
schemes
Variant 1: phase current measurement by 3 x 1 A or 5 A CTs (standard connection)
DE50380
Connection of 3 x 1 A or 5 A sensors to the CCA630 connector.
The measurement of the 3 phase currents allows the calculation of residual current.
Variant 2: phase current measurement by 2 x 1 A or 5 A CTs
DE50381
Connection of 2 x 1 A or 5 A sensors to the CCA630 connector.
Measurement of phase 1 and 3 currents is sufficient for all protection functions based
on phase current.
This arrangement does not allow the calculation of residual current.
Variant 3: phase current measurement by 3 LPCT type sensors
DE50382
Connection of 3 Low Power Current Transducer (LPCT) type sensors to the CCA671
connector. It is necessary to connect 3 sensors; if only one or two sensors are
connected, Sepam goes into fail-safe position.
6
Measurement of the 3 phase currents allows the calculation of residual current.
The In parameter, primary rated current measured by an LPCT, is to be chosen from
the following values, in Amps: 25, 50, 100, 125, 133, 200, 250, 320, 400, 500, 630,
666, 1000, 1600, 2000, 3150.
Parameter to be set using the SFT2841 software tool, to be completed by hardware
setting of the microswitches on the CCA671 connector.
6/10
Installation
Base unit
Other residual current input
connection schemes
Variant 1: residual current calculation by sum of 3 phase currents
Residual current is calculated by the vector sum of the 3 phase currents I1, I2 and
I3, measured by 3 x 1 A or 5 A CTs or by 3 LPCT type sensors.
See current input connection diagrams.
DE50383
Variant 2: residual current measurement by CSH120 or CSH200 core balance CT (standard connection)
Arrangement recommended for the protection of isolated or compensated neutral
systems, in which very low fault currents need to be detected.
Setting range from 0.01 In0 to 15 In0, with In0 = 2 A or 20 A according to parameter
setting.
DE50384
Variant 3: residual current measurement by 1 A or 5 A CTs and CSH30 interposing ring CT
The CSH30 interposing ring CT is used to connect 1 A or 5 A CTs to Sepam to
measure residual current:
b CSH30 interposing ring CT connected to 1 A CT: make 2 turns through CSH
primary
b CSH30 interposing ring CT connected to 5 A CT: make 4 turns through CSH
primary.
Setting range from 0.01 In0 to 15 In0, with In0 = CT primary current.
DE50385
6
DE50530
Variant 4: residual current measurement by core balance CT with ratio of 1/n (n between 50 and 1500)
The ACE990 is used as an interface between a MV core balance CT with a ratio of
1/n (50 y n y 1500) and the Sepam residual current input.
This arrangement allows the continued use of existing core balance CTs on the
installation.
Setting range from 0.01 In0 to 15 In0 (minimum 0.1 A),
with In0 = k.n,
n = number of core balance CT turns
and k = factor to be determined according to ACE990 wiring and setting range
used by Sepam, with a choice of 20 discrete values from 0.00578
to 0.26316.
6/11
Base unit
Connection of voltage inputs
Installation
DE50388
B21 and B22
types
6
Connector
A
B
6/12
Type
Ref.
Cable
Screw-type
CCA620
1 wire 0.2 to 2.5 mm2
(u AWG 24-12)
2 wires 0.2 to 1 mm2
(u AWG 24-16)
Ring lug 6.35 mm
CCA622
Screw-type
CCT640
C
RJ45
D
RJ45
1 wire 0.2 to 2.5 mm2
(u AWG 24-12)
2 wires 0.2 to 1 mm2
(u AWG 24-16)
CCA612
CCA770: L = 0.6 m
CCA772: L = 2 m
CCA774: L = 4 m
Installation
Base unit
Other voltage input connection
schemes
The phase and residual voltage transformer secondary circuits are connected
directly to the connector marked E .
The 3 impedance matching and isolation transformers are integrated in the
Sepam series 40 base unit.
DE10201
Variant 1: measurement of 3 phase-to-neutral voltages (standard connection)
Phase voltage sensor parameter setting
Residual voltage sensor parameter setting
Voltages measured
Values calculated
3V
3V sum
V1, V2, V3
U21, U32, U13, Vo, Vd, Vi, f
Measurements unavailable
Protection functions unavailable
(according to type of Sepam)
None
None
DE10202
Variant 2: measurement of 2 phase-to-phase voltages and residual voltage
Phase voltage sensor parameter setting
Residual voltage sensor parameter setting
Voltages measured
Values calculated
U21, U32
External VT
U21, U32, Vo
U13, V1, V2, V3, Vd, Vi, f
Measurements unavailable
Protection functions unavailable
(according to type of Sepam)
None
None
DE10203
Variant 3: measurement of 2 phase-to-phase voltages
Phase voltage sensor parameter setting
Residual voltage sensor parameter setting
Voltages measured
Values calculated
U21, U32
None
U21, U32
U13, Vd, Vi, f
Measurements unavailable
Protection functions unavailable
(according to type of Sepam)
V1, V2, V3, Vo
67N/67NC, 59N
6
DE10204
Variant 4: measurement of 1 phase-to-phase voltage and residual voltage
Phase voltage sensor parameter setting
Residual voltage sensor parameter setting
Voltages measured
Values calculated
U21
External VT
U21, Vo
f
Measurements unavailable
Protection functions unavailable
(according to type of Sepam)
U32, U13, V1, V2, V3, Vd, Vi
67, 47, 27D, 32P, 32Q/40, 27S
DE10205
Variant 5: measurement of 1 phase-to-phase voltage
Phase voltage sensor parameter setting
Residual voltage sensor parameter setting
Voltages measured
Values calculated
U21
None
U21
f
Measurements unavailable
Protection functions unavailable
(according to type of Sepam)
U32, U13, V1, V2, V3, Vo, Vd, Vi
67, 47, 27D, 32P, 32Q/40,
67N/67NC, 59N, 27S
6/13
Current transformers 1 A/5 A
1 A or 5 A CT block and connection
diagram
The current transformer (1 A or 5 A) secondary
windings are connected to the CCA630 connector, item
B.
MT10488
Installation
12
11
O14
9
8
O13
6
5
O12
3
2
O11
B
CSH
19
18
17
15
14
13
11
10
8
7
I14 I26
I25
I24
I13 I23
I22
5
4
I12
2
1
I11 I21
10
9
8
7
6
5
4
O4
11
10
O3
8
7
O2
5
4
2
1
O1
-/
+/
2
1
The connector contains 3 interposing ring CTs with
through primaries, which ensure impedance matching
and isolation between the 1 A or 5 A circuits and
Sepam.
The connector may be disconnected with the power on
since disconnection does not open the CT secondary
circuits.
MT10464
CCA630 connector
EM
B4
B1
P1
L1
B5
B2
P2
L2
L3
B6
B3
(1)
CCA630
Sepam current
inputs
6
(1) bridging strap supplied with the CCA630.
b open the 2 side shields for access to the connection
terminals. The shields may be removed, if necessary, to
make wiring easier. If removed, they must be replaced
after wiring
b remove the bridging strap, if necessary. The strap
links terminals 1, 2 and 3
b connect the wires using 3 mm ring lugs. The
connector accommodates wires with cross-sections of
1.5 to 6 mm2 (AWG 16 to AWG 10)
b close the side shields
b plug the connector into the 9-pin inlet on the rear
panel, item B
b tighten the 2 CCA630 connector fastening screws on
the rear panel of Sepam.
6/14
MT10318
CCA630 wiring
1
2
3
LPCT type current sensors
LPCT sensor block and connection
diagram
The 3 LPCT current transformers (CLP1 sensor
equipped with a 5 m standard cable) are connected to
the CCA670 connector mounted in the rear panel of
Sepam, item B .
The connection of only one or two LPCT sensors is not
allowed and causes Sepam to go into the failsafe
position.
DE50563
Installation
CCA670 connector parameter setting
The CCA670 connector should be calibrated at the time
of Sepam commissioning according to the following
instructions:
b use a screwdriver to remove the shield located in the
“LPCT settings” zone; the shield protects 3 blocks of 8
microswitches marked L1, L2, L3
b on the L1 block, set the microswitch that corresponds
to the selected rated current to "1" (2 ratings possible
for each position)
v the rated current should be the same as the one set
in Sepam ("General characteristics“ menu via the
SFT2841 software tool, “Current sensors" screen with
advanced UMI)
v leave the 7 other microswitches set to “0”
b set the other 2 blocks of switches L2 and L3 to the
same position as block L1 and close the shield.
6
MT11028
MT11056
The CCA613 test plug, panel-mounted on the front of
the cubicle and fitted with a 3-meter cord, is used to
transfer data from the integrated test plug to the
CCA670 interface connector on the rear panel of
Sepam.
MT11022
CCA613 remote test plug
67,5
DE50564
69
44
Front view with cover lifted.
46
Right side view.
Cutout.
Accessory connection principle.
6/15
Use of CSH120 and CSH200 core balance
CTs
Assembly
MT10315
The only difference between the CSH120 and CSH200
core balance CTs is their inner diameter (120 mm and
200 mm).
Due to their low voltage isolation, they may only be
used on cables.
MT10892
Core balance CTs CSH120
and CSH200
MT10891
Installation
Assembly on mounting plate.
Group the MV cable (or cables) in the
middle of the core balance CT.
Use non-conductive binding to hold
the cable.
Remember to insert the 3 medium
voltage cable shielding earthing
cables through the core balance CT.
MT10466
CSH120 and CSH200 connection diagram
Wiring
The CSH120 or CSH200 core balance CT is connected to Sepam’s 20-pin connector
(item A ).
Recommended cable:
b sheathed cable, shielded by tined copper braid
b min. cable cross-section 0.93 mm2 (AWG 18)
b resistance per unit length < 100 milli ohms/m
b min. dielectric strength: 1000 V.
Connect the connector cable shielding in the shortest manner possible to terminal 18
on Sepam.
Flatten the connection cable against the metal frames of the cubicle.
The connection cable shielding is grounded in Sepam. Do not ground the cable by
any other means.
P1
S2
CSH core balance CT
S1
P2
metal shielding
of earthed cable
6
1
2
MT10339
Assembly on MV cables.
The maximum resistance of the Sepam connection wiring must not be more
than 4 Ω.
3
Cable shield earthing.
MT10467
MT10328
Dimensions
P1
A
REF
18
19
4 horizontal mounting
holes 5
S2
S1
P2
1
2
3
4 vertical
mounting holes 5
Cotes
CSH 120
A
B
120
164
CSH 200
200
256
6/16
Masse
0.6 kg
D
44
E
190
F
76
H
40
J
166
K
62
L
35
46
274
120
60
257
104
37
1.4 kg
CSH30 interposing ring CT
Installation
Use of CSH30 interposing ring CT
Vertical assembly.
Wiring
The secondary winding of the CSH30 is connected to the connector, item A .
Cable to be used:
b sheathed cable, shielded by tined copper braid
b min. cable cross-section 0.93 mm2 (AWG 18) (max. 2.5 mm2)
b resistance per unit length < 100 mΩ/m
b min. dielectric strength: 1000 V.
It is essential for the CSH30 interposing ring CT to be installed near Sepam (Sepam
CSH30 link less than 2 m).
Flatten the cable against the metal frames of the cubicle.
The connection cable shielding is grounded in Sepam.
Do not ground the cable by any other means.
4 turns
A
REF
18
19
CSH30
interposing
ring CT
S2
P1 S1
P1
S1
P2 S2
P2
5A
core
bal. CT
1
2
Horizontal assembly.
3
Connection to 5 A secondary
Connection to 1 A secondary
MT10331
Example with CT 5 A.
MT10333
MT10468
Connection diagram
The CSH30 is made to adapt to the type of 1 A or 5 A
current transformer by the number of turns of the
secondary wiring in the CSH30 interposing ring CT:
b 5 A rating CT - 4 turns
b 1 A rating CT - 2 turns.
MT10501
Assembly
MT10500
LThe CSH30 interposing ring CT should be used when
residual current is measured by a current transformer
with a secondary circuit (1 A or 5 A). It acts as an
interface between the current transformer and the
Sepam residual current input.
The CSH30 interposing ring CT is mounted on a
symmetrical DIN rail. It may also be mounted on a plate
by means of the mounting holes in its base.
6
b plug into the connector
b insert the transformer secondary
wire through the CSH30 interposing
ring CT 4 times.
b plug into the connector
b insert the transformer secondary
wire through the CSH30 interposing
ring CT twice.
Dimensions
60
MT10469
29
8
4
50
82
16
5
2
2
4.5
4.5
Weight: 0.12 kg.
6/17
ACE990 interface
Installation
Use
To wire the ACE 990 interface correctly, it is necessary
to know the following:
b ratio of the core balance CT (1/n)
b core balance CT power
b close approximation of the rated current In0 (1).
The table opposite may be used to determine the
possible choices for the connection of the ACE990
interface primary circuit to the Sepam residual current
input, as well as the rated residual current setting Ino.
The exact value of the rated current In0 (1) to be set is
given by the following formula:
In0 = k x number of core balance CT turns
with k the factor defined in the table opposite.
Example:
The core balance CT used has a ratio of 1/400, 2 VA.
If the current being monitored is between
0.5 A and 60 A, a close approximation of the rated
current Ino may be 5 A.
This value may be used to accurately measure from
0.5 A to 75 A.
approx. In0
Calculate the ratio: number of turns
In the table opposite, find the closest value of k.
5/400 = 0.0125 close value k = 0.01136.
It correspoinds to core balance CTs with more than
0.1 VA of power.
6
The In0 value to be set is:
In0 = 0.01136 x 400 = 4.5 A
This In0 value may be used to monitor a current
between 0.45 A and 67.5 A.
The secondary circuit of the MV core balance CT is
wired to ACE990 terminals E2 and E4.
Characteristics
b accuracy:
amplitude: ±1 %
phase: < 2°
b maximum permissible current: 20 kA 1 s (on primary
of MV core balance CT with ratio 1/50 that does not
saturate)
b operating temperature: -5 °C +55 °C
b storage temperature: -25 °C +70 °C.
(1) Current value for which the required setting range extends
to between 10 % and 1500 % of this value, at the most.
(2) Parameter setting and adjustment of Ino current as a
multiple of 0.1 A may be accessed from the SFT 2841 software
tool or from the advanced UMI (general characteristics).
6/18
Mounted on symmetrical DIN rail, weight 640 g.
DE50530
The ACE990 is used to match the measurement of a
MV core balance CT with ratio 1/n (50 y n y 1500) with
that of the Sepam residual current input.
So as not to downgrade measurement accuracy, the
MV core balance CT must be able to supply sufficient
power. The value is given in the table opposite.
MT10341
Use of ACE990 interface
Value of k
0.00578
0.00676
0.00885
0.00909
0.01136
0.01587
0.01667
0.02000
0.02632
0.04000
ACE990
input
E1 – E5
E2 – E5
E1 – E4
E3 – E5
E2 – E4
E1 – E3
E4 – E5
E3 – E4
E2 – E3
E1 – E2
Choice of Sepam 1000+
residual current(2)
ACE990 - range 1
ACE990 - range 1
ACE990 - range 1
ACE990 - range 1
ACE990 - range 1
ACE990 - range 1
ACE990 - range 1
ACE990 - range 1
ACE990 - range 1
ACE990 - range 1
Min. MV core
bal. CT power
0.1 VA
0.1 VA
0.1 VA
0.1 VA
0.1 VA
0.1 VA
0.1 VA
0.1 VA
0.1 VA
0.2 VA
0.05780
0.06757
0.08850
0.09091
0.11364
0.15873
0.16667
0.20000
0.26316
E1 – E5
E2 – E5
E1 – E4
E3 – E5
E2 – E4
E1 – E3
E4 – E5
E3 – E4
E2 – E3
ACE990 - range 2
ACE990 - range 2
ACE990 - range 2
ACE990 - range 2
ACE990 - range 2
ACE990 - range 2
ACE990 - range 2
ACE990 - range 2
ACE990 - range 2
2.5 VA
2.5 VA
3.0 VA
3.0 VA
3.0 VA
4.5 VA
4.5 VA
5.5 VA
7.5 VA
Wiring
Only one core balance CT may be connected to the ACE990 interface.
The secondary circuit of the MV core balance CT is connected to 2 of the 5 ACE990
interface inputs. The core balance CT must be connected to the interface in the right
direction for correct operation, in particular S1 on the MV core balance CT must be
connected to the terminal with the lowest index (Ex).
Cables to be used:
b cable between the core balance CT and the ACE990: length less than 50 m
b sheathed, shielded cable between the ACE990 and Sepam: maximum length 2 m
b cable cross-section between 0.93 mm2 (AWG 18) and 2.5 mm2 (AWG 13)
b resistance per unit length less than 100 mΩ/m
b minimum dielectric strength: 100 V.
Connect the ACE990 connection cable shielding in the shortest manner possible
(maximum 2 cm) to pin 18 of the connector A .
Flatten the cable against the metal frames of the cubicle. The connection cable
shielding is grounded in Sepam.
Do not ground the cable by any other means.
Voltage transformers
Installation
The phase and residual voltage transformer secondary circuits are connected to the
CCT640 connector, item B on B2X type Sepam units.
CCT640
DE50565
The connector contains 4 transformers which provide impedance matching and
isolation between the VTs and Sepam input circuits.
Terminals B1 to B6 are intended for phase voltage measurement (1), and B7 and B8
for residual voltage measurement (case shown, not connected if obtained by the sum
of the 3 phase voltages).
(1) 1, 2 or 3 VTs (case shown).
Installation of the CCT640 connector
b insert the 2 connector pins into the slots 1 on the base unit
b flatten the connector against the unit to plug it into the 9-pin SUB-D connector
(principle similar to that of the MES module)
b tighten the mounting screw 2 .
Connection
b the connections are made to the screw type connectors that may be accessed on
the rear of the CCT640 (item 3 )
b wiring without fitting:
v 1 wire with maximum cross-section of 0.2 to 2.5 mm2 (u AWG 24-12) or 2 wires
with maximum cross-section of 0.2 to 1 mm2 (u AWG 24-16)
v stripped length: 8 to 10 mm
b wiring with fitting:
v recommended wiring with Telemecanique fitting:
- DZ5CE015D for 1 wire 1.5 mm2
- DZ5CE025D for 1 wire 2.5 mm2
- AZ5DE010D for 2 wires 1 mm2
v tube length: 8.2 mm
v stripped length: 8 mm
b the CCT640 must be earthed (by green/yellow wire + ring lug) on the screw 4
(safety in case the CCT640 become unplugged).
B
12
11
O14
9
8
O13
6
5
O12
3
2
O11
3
CSH
19
18
17
15
14
13
11
10
8
7
MT10514
MT10513
2
I14 I26
I25
I24
I13 I23
I22
5
4
I12
2
1
I11 I21
10
9
8
7
6
5
4
2
1
O4
11
10
O3
8
7
O2
5
4
O1
2
1
4
-/
+/
1
3
6/19
6
Installation
MES114 modules
Function
PE10074
The 4 outputs included on the Sepam may be extended by adding an optional
MES114 module with 10 inputs and 4 outputs, available in 3 versions:
b MES114: 10 DC inputs voltage from from 24 V DC to 250 V DC
b MES114E: 10 inputs, voltage 110-125 V AC or V DC
b MES114F: 10 inputs, voltage 220-250 V AC or V DC
The assignment of the inputs and outputs may be set up on the advanced UMI or
using the SFT2841 software tool.
Characteristics
MES114 module
Weight
Logical inputs
Voltage
Range
MES114E
24 to
250 V DC
19.2 to
275 V DC
/
3 mA
14 V DC
110 to
125 V DC
88 to
150 VV DC
/
3 mA
82 V DC
Frequency
Typical consumption
Typical switching
threshold
O11 control relay output
Voltage
Dc
Ac
(47.5 to
63 Hz)
Continuous current
Breaking capacity
Resistive
load
Load
L/R < 20 ms
Load
L/R < 40 ms
Load
cos ϕ > 0.3
Making capacity
O12 to O14 indication relay output
Voltage
Dc
Ac
(47.5 to
63 Hz)
Continuous current
Breaking capacity
Load
L/R < 20 ms
Load
cos ϕ > 0.3
Making capacity
DE10226
6
0.28 kg
MES114
MES114F
110 V AC
88 to
132 V AC
47 to 63 Hz
3 mA
58 V AC
24 / 48 V DC 127 V DC
220 to
250 V DC
176 to
275 V DC
/
3 mA
154 V DC
220 to
240 V AC
176 to
264 V AC
47 to 63 Hz
3 mA
120 V AC
220 V DC
100 to
240 V AC
8A
8/4A
8A
0.7 A
8A
0.3 A
6/2A
0.5 A
0.2 A
4/1A
0.2 A
0.1 A
8A
8A
5A
< 15 A for 200 ms
24 / 48 V DC 127 V DC
220 V DC
100 to
240 V AC
2A
2/1A
2A
0.5 A
2A
0.15 A
2A
1A
< 15 A for 200 ms
Description
L , M and K : 3 removable, lockable screw-type connectors.
L : connectors for 4 relay outputs:
b O11: 1 control relay output
b O12 to O14: 3 indication relay outputs.
M : connectors for 4 independent logic inputs I11 to I14
K : connectors for 6 logic inputs:
b I21: 1 independent logic input
b I22 to I26: 5 common point logic inputs.
1: 25-pin sub-D connector to connect the module to the base unit
2: voltage selector switche for MES114E and MES114F module inputs, to be set to:
v V DC for 10 DC voltage inputs (default setting)
v V AC for 10 AC voltage inputs.
3 : label to be filled in to indicate the chosen parameter setting for MES114E and
MES114F input voltages.
The parameter setting status may be accessed in the "Sepam Diagnosis" screen of
the SFT2841 software tool.
Parameter setting of the inputs for AC voltage (V AC setting) inhibits the "operating
time measurement" function.
6/20
MES114 modules
Installation
MT10479
Assembly
2
3
b insert the 2 pins on the MES module into the slots 1 on the base unit
b flatten the module up against the base unit to plug it into the connector 2
b tighten the 3 mounting screws.
1
DE10227
Connection
For safety reasons (access to dangerous voltages), all terminals must be
screwed tight, whether or not they are used.
The inputs are potential-free and the DC power supply source is external.
Wiring of connectors L , M and K :
b wiring without fitting:
v 1 wire with maximum cross-section 0.2 to 2.5 mm² (> AWG 24-12)
v or 2 wires with maximum cross-section 0.2 to 1 mm² (> AWG 24-16)
v stripped length: 8 to 10 mm
b wiring with fittings:
v recommended wiring with Telemecanique fitting:
- DZ5CE015D for one 1.5 mm² wire
- DZ5CE025D for one 2.5 mm² wire
- AZ5DE010D for two 1 mm² wires
v tube length: 8.2 mm
v stripped length: 8 mm.
6
6/21
Optional remote modules
Connection
Installation
DE50566
LThe optional MET148, MSA141 or DSM303 modules are connected to the base unit
connector D by a series of links using prefabricated cords which come in 3 different
lengths with black fittings.
b CCA770 (L = 0.6 m)
b CCA772 (L = 2 m)
b CCA774 (L = 4 m).
The DSM303 module may only be connected at the end of the series.
The MSA141 module must be the first one connected to the Sepam unit.
For the configuration that uses the 3 optional modules, comply with the wiring in the
diagram below.
D
CCA772
C
6
1
I>5
Dd
CCA612
Da
CCA770
MSA141
module
Dd
Trip
Io
n
ff
0o
Da
51
I>>
on
MET148
module
ACE949-2 (2 wires)
or ACE959 (4 wires)
module
CCA772
or
CCA774
51n
Io>
n
>51
Io>
t
ex
2A
16
= 61A
1
I1
= 63A
1
I2
=
I3
et
res
ar
cle
DSM303
6/22
Installation
Temperature sensor modules
MET148-2
Function
PE10069
The MET148-2 module may be used to connect 8 temperature sensors (RTDs) of the
same type:
b Pt100, Ni100 or Ni120 type RTDs, according to parameter setting
b 3-wire temperature sensors
b a single module for each Sepam series 20 base unit, to be connected by one of
the CCA770, CCA772 or CCA774 cords (0.6 or 2 or 4 meters))
The temperature measurement (e.g. in a transformer or motor winding) is utilized by
the following protection functions:
b thermal overload (to take ambient termperature into account)
b temperature monitoring.
MET148-2 temperature sensor module.
Characteristics
MET148-2 module
Weight
Assembly
Operating temperature
Environmental characteristics
RTDs
Isolation from earth
Current injected in RTD
0.2 kg
On symmetrical DIN rail
-25 °C to +70 °C
Same characteristics as Sepam base units
Pt100
Ni100 / Ni120
None
None
4 mA
4 mA
Description and dimensions
DE10216
A Terminal block for RTDs 1 to 4.
B Terminal block for RTDs 5 to 8.
Da RJ45 connector to connect the module to the base unit with a CCA77x cord.
Dd RJ45 connector to link up the next remote module with a CCA77x cord
(according to application).
t Grounding/earthing terminal.
1
2
Jumper for impedance matching with load resistor (Rc), to be set to:
b Rc , if the module is not the last interlinked module (default position)
b Rc, if the module is the last interlinked module.
Jumper used to select module number, to be set to:
b MET1: 1st MET148-2 module, to measure temperatures T1 to T8
(default position).
6
Connection
Connection of the earthing terminal
By tinned copper braid or cable fitted with a 4 mm ring lug.
DE10217
(1) 70 mm with CCA77x cord connected.
Connection of RTDs to screw-type connectors
b 1 wire with cross-section 0.2 to 2.5 mm² (u AWG 24-12)
b or 2 wires with cross-section 0.2 to 1 mm² (u AWG 24-16).
Recommended cross-sections according to distance:
b up to 100 m u 1 mm², AWG 16
b up to 300 m u 1.5 mm², AWG 14
b up to 1 km u 2.5 mm², AWG 12.
Wriring precautions
b it is preferable to use shielded cables
The use of unshielded cables may cause measurement errors, which vary in degree
on the level of surrounding electromagnetic disturbance
b only connect the shielding at the MET148-2 end, in the shortest manner possible,
to the corresponding terminals of connectors A and B
b do not connect the shielding at the RTD end.
Accuracy derating according to wiring
The error ∆t is proportional to the length of the cable and inversely proportional to the
cable cross-section:
L ( km )
∆t ( °C ) = 2 × ---------------------2
S ( mm )
b ±2.1 °C/km for 0.93 mm² cross-section
b ±1 °C/km for 1.92 mm² cross-section.
6/23
Installation
Analog output module MSA141
Function
PE10070
The MSA141 module converts one of the Sepam measurements into an analog
signal:
b selection of the measurement to be converted by parameter setting
b 0-10 mA, 4-20 mA, 0-20 mA analog signal according to parameter setting
b scaling of the analog signal by setting minimum and maximum values of the
converted measurement.
Example: the setting used to have phase current 1 as a 0-10 mA analog output with
a dynamic range of 0 to 300 A is:
v minimum value = 0
v maximum value = 3000
b a single module for each Sepam base unit, to be connected by one of the CCA770,
CCA772 or CCA774 cords (0.6 or 2 or 4 meters).
MSA141 analog output module.
The analog output may also be remotely managed via the Modbus communication
network.
Characteristics
MSA141 module
Weight
Assembly
Operating temperature
Environmental characteristics
Analog output
Current
Scaling (no data input checking)
Load impedance
Accuracy
Measurements available
Phase and residual currents
Phase-to-neutral and phase-to-phase
voltages
Frequency
Thermal capacity used
Temperatures
Remote setting via communication link
4-20 mA, 0-20 mA, 0-10 mA
Minimum value
Maximum value
< 600 Ω (wiring included)
0.5 %
Unit
Series 20
0.1 A
b
1V
b
0.01 Hz
1%
1°C
b
b
b
b
DE10218
Description and dimensions
A Terminal block for analog output.
Da RJ45 connector to connect the module to the base unit with a CCA77x cord.
Dd RJ45 connector to link up the next remote module with a CCA77x cord
(according to application).
t Grounding/earthing terminal.
1
Jumper for impedance matching with load resistor (Rc), to be set to:
b Rc , if the module is not the last interlinked module (default position)
b Rc, if the module is the last interlinked module.
Connection
Earthing terminal connection
By tinned copper braid or cable fitted with a 4 mm ring lug.
(1) 70 mm with CCA77x cord connected.
Connection of analog output to screw-type connector
b 1 wire with cross-section 0.2 to 2.5 mm² (u AWG 24-12)
b or 2 wires with cross-section 0.2 to 1 mm² (u AWG 24-16).
Wiring precautions
b it is preferable to use shielded cables
b use tinned copper braid to connect the shielding at least at the MSA141 end.
DE10219
6
0.2 kg
On symmetrical DIN rail
-25°C to +70°C
Same characteristics as Sepam base units
6/24
Installation
2-wire RS 485 network interface
ACE949-2
Function
PE10071
The ACE949-2 interface performs 2 functions:
b electrical interface between Sepam and a 2-wire RS 485 communication network
b main network cable branching box for the connection of a Sepam with a CCA612
cord.
Characteristics
ACE949-2 2-wire RS 485 network connection interface.
ACE949-2 module
Weight
Assembly
Operating temperature
Environmental characteristics
2-wire RS 485 electrical interface
Standard
Distributed power supply
Consumption
0.1 kg
On symmetrical DIN rail
-25°C to +70°C
Same characteristics as Sepam base units
EIA 2-wire RS 485 differential
External, 12 V DC or 24 V DC ±10 %
16 mA in receiving mode
40 mA maximum in sending mode
DE10220
Maximum length of 2-wire RS 485 network with standard cable
Number of Sepam units
Maximum length with
Maximum length with
12 V DC power supply
24 V DC power supply
5
320 m
1000 m
10
180 m
750 m
20
160 m
450 m
25
125 m
375 m
Note: lengths multiplied by 3 with FILECA F2644-1 high-performance cable.
Description and dimensions
A and B Terminal blocks for network cable.
C RJ45 plug to connect the interface to the base unit with a CCA612 cord.
t Grounding/earthing terminal.
(1) 70 mm with CCA612 cord connected.
1
DE50350
2
3
Green LED, flashes when communication is active (sending or receiving in
progress).
Jumper for RS 485 network line-end impedance matching with load resistor (Rc),
to be set to:
b Rc , if the module is not at one end of the RS 485 network (default position)
b Rc, if the module is at one end of the RS 485 network.
Network cable clamps (inner diameter of clamp = 6 mm).
Connection
b connection of network cable to screw-type terminal blocks A and B
b connection of earthing terminal by tinned copper braid or cable fitted with 4 mm
ring lug
b the interfaces are fitted with clamps to hold the network cable and recover
shielding at the incoming and outgoing points of the network cable:
v the network cable must be stripped
v the cable shielding braid must be around and in contact with the clamp
b the interface is to be connected to connector C on the base unit using a CCA612
cord (length = 3 m, green fittings)
b the interfaces are to be supplied with 12 V DC or 24 V DC
b refer to the "Sepam - RS 485 network connection guide " PCRED399074EN for all
the details on how to implement a complete RS 485 network.
6/25
6
Installation
4-wire RS 485 network interface
ACE959
Function
PE10072
The ACE959 interface performs 2 functions:
b electrical interface between Sepam and a 4-wire RS 485 communication network
b main network cable branching box for the connection of a Sepam with a CCA612
cord.
Characteristics
ACE959 module
ACE959 4-wire RS 485 network connection interface.
Weight
Assembly
Operating temperature
Environmental characteristics
4-wire RS 485 electrical interface
Standard
Distributed power supply
Consumption
0.2 kg
On symmetrical DIN rail
-25°C to +70°C
Same characteristics as Sepam base units
DE10222
EIA 4-wire RS 485 differential
External, 12 V DC or 24 V DC ±10 %
16 mA in receiving mode
40 mA maximum in sending mode
Maximum length of 4-wire RS 485 network with standard cable
Number of Sepam units
Maximum length with
Maximum length with
12 V DC power supply
24 V DC power supply
5
320 m
1000 m
10
180 m
750 m
20
160 m
450 m
25
125 m
375 m
Note: lengths multiplied by 3 with FILECA F3644-1 high-performance cable.
Description and dimensions
A and B
Terminal blocks for network cable.
C RJ45 plug to connect the interface to the base unit with a CCA612 cord.
D Terminal block for a separate auxiliary power supply (12 V DC or 24 V DC).
t Grounding/earthing terminal.
1
6
(1) 70 mm with CCA612 cord connected.
DE50351
2
3
Green LED, flashes when communication is active (sending or receiving in
progress).
Jumper for RS 485 network line-end impedance matching with load resistor (Rc),
to be set to:
b Rc , if the module is not at one end of the RS 485 network (default position)
b Rc, if the module is at one end of the RS 485 network.
Network cable clamps (inner diameter of clamp = 6 mm).
Connection
b connection of network cable to screw-type terminal blocks A and B
b connection of earthing terminal by tinned copper braid or cable fitted with 4 mm
ring lug
b the interfaces are fitted with clamps to hold the network cable and recover
shielding at the incoming and outgoing points of the network cable:
v the network cable must be stripped
v the cable shielding braid must be around and in contact with the clamp
b the interface is to be connected to connector C on the base unit using a CCA612
cord (length = 3 m, green fittings)
b the interfaces are to be supplied with 12 V DC or 24 V DC
b the ACE959 can be connected to a separate distributed power supply (not
included in shielded cable). Terminal block D is used to connect the distributed
power supply module
b refer to the "Sepam - RS 485 network connection guide" PCRED399074EN for all
the details on how to implement a complete RS 485 network.
Nota : Sepam receiving: Rx+, Rx- (or IN+, IN-)
Sepam sending: Tx+, Tx- (or OUT+, OUT-).
6/26
Installation
Fiber optic interface ACE937
Function
PE10073
The ACE937 interface is used to connect Sepam to a fiber optic communication star
system.
This remote module is connected to the Sepam base unit by a CCA612 cord.
Characteristics
ACE937 module
Weight
Assembly
Power supply
Operating temperature
Environmental characteristics
ACE937 fiber optic connection interface.
Fiber optic interface
Wavelength
Type of connector
Fiber type
Fiber optic
Numerical
diameter (µm) aperture (NA)
50/125
62.5/125
100/140
200 (HCS)
0.2
0.275
0.3
0.37
0.1 kg
On symmetrical DIN rail
Supplied by Sepam
-25°C to +70°C
Same characteristics as Sepam base units
820 nm (infra-red)
ST
Multimode glass
Maximum
Minimum optical
attenuation
power available (dBm)
(dBm/km)
2.7
5.6
3.2
9.4
4
14.9
6
19.2
Maximum
length of fiber
(m)
700
1800
2800
2600
Maximum length calculated with:
b minimum optical power available
b maximum fiber attenuation
b losses in 2 ST connectors: 0.6 dBm
b optical power margin: 3 dBm (according to IEC60870 standard).
Example for a 62.5/125 µm fiber
Lmax = (9.4 - 3 -0.6) / 3.2 = 1.8 km.
DE10224
Description and dimensions
C RJ 45 plug to connect the interface to the base unit with a CCA612 cord.
1
2
3
Green LED, flashes when communication is active (sending or receiving in
progress)..
Rx, female ST type connector (Sepam receiving).
Tx, female ST type connector (Sepam sending).
(1) 70 mm with CCA612 cord connected.
DE10225
Connection
b the sending and receiving fiber optics fibers must be equipped with male ST type
connectors
b fiber optics screw-locked to Rx and Tx connectors
b the interface is to be connected to connector C on the base unit using a CCA612
cord (length = 3 m, green fittings)
6/27
6
Installation
6
6/28
Use
Contents
User Machine Interfaces
7/2
Expert UMI - SFT2841
Presentation
7/3
Expert UMI - SFT2841
General screen organization
7/4
Expert UMI - SFT2841
Use of the software
7/5
UMI on front panel
Presentation
7/6
Advanced UMI
Access to data
7/7
Advanced UMI
White keys for current operation
7/8
Advanced UMI
Blue keys for parameter and protection setting
7/10
Advanced UMI
Data entry principles
7/12
Default parameter setting
7/13
Commissioning: principles and method
7/15
Testing and metering equipment required
7/16
General examination and preliminary actions
7/17
Checking of parameter and protection settings
7/18
Checking of phase current input connection
7/19
Checking of residual current input connection
7/20
Checking phase voltage input connection
7/21
Checking of residual voltage input connection
7/22
Checking of logic input and output connection
7/23
Validation of the complete protection chain
7/24
Checking of optional module connection
7/25
Test sheet
7/26
Maintenance
7/27
7/1
7
User Machine Interfaces
Use
Two different levels of user machine interface (UMI) are offered on the front panel of
Sepam:
b basic UMI, with signal lamps, for installations operated via a remote system with
no need for local operation
b advanced UMI, with keypad and graphic LCD display, giving access to all the
information necessary for local operation and Sepam parameter setting.
The UMI on the front panel of Sepam may be completed by an expert UMI comprising
the SFT2841 PC software tool, which may be used for all Sepam parameter setting,
local operation and customization functions.
DE50339
The expert UMI comes as a kit, the SFT2841 kit, which includes:
b a CD-ROM, with
v SFT2841 setting and operation software
v SFT2826 disturbance recording file display software
b CCA783 cord, for connection between the PC and the serial port on the front panel
of Sepam.
7
7/2
Expert UMI - SFT2841
Presentation
This expert UMI is available (as a complement to the
basic or advanced UMI integrated in the product) on the
screen of a PC equipped with the SFT2841 software
tool and connected to the RS 232 link on the front panel
of Sepam (run in a Windows u V95 or NT environment).
All the data used for the same task are grouped
together in the same screen to facilitate operation.
Menus and icons are used for fast, direct access to the
required information.
PE10051
Use
Current operation
b display of all metering and operation data
b display of alarm messages with the time of
appearance (date, hour, mn, s, ms)
b display of diagnosis data such as: tripping current,
number of switchgear operations and cumulative
breaking current
b display of all the protection and parameter settings
b display of the logic status of inputs, outputs and
signal lamps.
This UMI is the solution suited to occasional local
operation, for demanding personnel who require fast
access to all the information.
Example of a measurement display screen (Sepam M20).
PE10052
Parameter and protection setting (1)
b display and setting of all the parameters of each
protection function in the same page
b program logic parameter setting, parameter setting
of general installation and Sepam data
b input data may be prepared ahead of time and
transferred into the corresponding Sepam units in a
single operation (downloading function).
Main functions performed by SFT2841:
b changing of passwords
b entry of general characteristics (ratings, integration
period, …)
b entry of protection settings
b changing of program logic assignments
b enabling/disabling of functions
b saving of files.
Saving
b protection and parameter setting data may be saved
b printing of reports is possible as well.
This UMI may also be used to recover disturbance
recording files and provide graphic display using the
SFT2826 software tool.
Operating assistance
Access from all the screens to a help section which
contains all the technical data required for Sepam
installation and use.
7
Example of a phase overcurrent protection setting screen.
(1) Modes accessed via 2 passwords (protection setting level,
parameter setting level).
7/3
Expert UMI - SFT2841
General screen organization
A Sepam document is displayed on the screen via a
graphic interface that has the conventional Windows
features.
All the SFT2841 software screens are set up in the
same way, i.e.:
b A : title bar, with:
v name of the application (SFT2841)
v identification of the Sepam document displayed
v window manipulation handles
b B : menu bar, to access all the SFT2841 software
functions (unavailable functions are dimmed)
b C : toolbar, a group of contextual icons for quick
access to the main functions (also accessed via the
menu bar)
b D : work zone available to the user, presented in the
form of tab boxes
b E : status bar, with the following information relating
to the active document:
alarm on
v identification of the connection window
v SFT2841 operating mode, connected or not
connected,
v type of Sepam
v Sepam editing identification
v identification level
v Sepam operating mode
v PC date and time.
A
B
C
PE10053
Use
D
PE10054
E
Example of Sepam configuration screen.
On-line help
The operator may look up on-line help at any time via
the "?" command in the menu bar.
To use the on-line help, a browser such as Netscape
Navigator or Internet Explorer MS is required.
7
Example of general characteristics screen.
7/4
Use
Expert UMI - SFT2841
Use of the software
Not connected to Sepam mode
Connected to Sepam mode
Sepam parameter and protection setting
The parameter and protection setting of a Sepam using
SFT2841 consists of preparing the Sepam file
containing all the characteristics that are specific to the
application, a file that is then downloaded into Sepam
at the time of commissioning.
Operating mode:
b create a Sepam file for the type of Sepam to be set
up. (The newly created file contains the Sepam factoryset parameter and protection settings)
b modify the "Sepam" page function sheet parameters
and the "Protections" page function sheet protection
settings.
A guided mode may be used to go through all the
function sheets to be modified in the natural order.
The screens may be sequenced in guided mode by
means of the "Previous screen" and "Next screen"
functions in the "Options" menu, which are also
available in the form of icons in the toolbar.
The screens / function sheets are sequenced in the
following order:
1. "Sepam configuration",
2. "Program logic",
3. "General characteristics",
4. protection setting screens, according to the type of
Sepam,
5. "Control matrix"
Modification of function sheet contents:
b the parameter and protection setting input fields are
suited to the type of value:
v choice buttons
v numerical value input fields
v dialogue box (Combo box)
b the modifications made to a function sheet are to be
"Applied" or "Canceled" before the user goes on to the
following function sheet
b the consistency of the parameter and protection
settings entered is checked:
v a clear message specifies the inconsistent value in
the function sheet opened
v values which become inconsistent following the
modification of a parameter are replaced by "****" and
must be corrected.
Precaution
When a laptop is used, given the risks inherent to the accumulation of static
electricity, the customary precaution consists of discharging in contact with an
earthed metal frame before phsycially connecting the CCA783 cord (supplied with
the SFT2841 kit).
Plugging into Sepam
b plugging of the 9-pin connector (SUB-D type) into one of the PC communication
ports. Configuration of the PC communciation port via the "Communication port"
function in the "Options" menu
b plugging of the 6-pin connector into the connector (round minidin type) situated
behind the blanking plate on the front panel of Sepam or the DSM303 module.
Connection to Sepam
2 possibilities for setting up the connection between SFT2841 and Sepam:
b "Connection" function in the "File" menu
b choice of "connect to the Sepam" at the start-up of SFT2841.
Once the connection with Sepam has been established, "Connected" appears in the
status bar, and the Sepam connection window may be accessed in the work zone.
User identification
The window intended for the entry of the 4-digit password is activated:
b via the "Passwords" tab
b via the "Identification" function in the "Sepam" menu
b via the "Identification" icon
.
The "return to Operating mode" function in the "Passwords" tab removes access
rights to parameter and protection setting mode.
Downloading of parameters and protection settings
Parameter and protection setting files may only be downloaded in the connected
Sepam in Parameter setting mode.
Once the connection has been established, the procedure for downloading a
parameter and protection setting file is as follows:
b activate the "Download Sepam" function in the "Sepam" menu
b select the *.rpg file which contains the data to be downloaded
b acknowledge the end of operation report.
Return to factory settings
This operation is only possible in Parameter setting mode, via the "Sepam" menu. All
of the Sepam general characteristics, protection settings and the control matrix go
back to the default values.
Uploading of parameter and protection settings
The connected Sepam parameter and protection setting file may only be uploaded in
Operating mode.
Once the connection has been established, the procedure for uploading a parameter
and protection setting file is as follows:
b activate the "Upload Sepam" function in the "Sepam" menu
b select the *.rpg file that is to contain the uploaded data
b acknowledge the end of operation report.
Local operation of Sepam
Connected to Sepam, SFT2841 offers all the local operating functions available in the
advanced UMI screen, plus the following functions:
b setting of Sepam internal clock, via the "general characteristics" tab
b implementation of the disturbance recording function, via the "Fault recording"
menu "OPG": validation/inhibition of the function, recovery of Sepam files, start-up of
SFT2826
b consultation of the history of the last 64 Sepam alarms, with time-tagging
b access to Sepam diagnostic data, in the "Sepam" tab box, included in "Sepam
diagnosis"
b in Parameter setting mode, the switchgear diagnositic values may be modified:
operation counter, cumulative breaking current to reset the values after a change of
breaking device.
7/5
7
UMI on front panel
Presentation
Use
This UMI includes:
b 2 signal lamps indicating Sepam operating status:
v green "on" indicator: device on
v red "wrench" indicator: device unavailable
(initialization phase or detection of internal failure)
b 9 parameterizable yellow signal lamps, fitted with a
standard label (with SFT2841, a customized label can
be printed on a laser printer)
b "reset" button for clearing faults and resetting
b 1 connection port for the RS 232 link with the PC
(CCA783 cord), the connector is protected by a sliding
cover.
MT10276
Basic UMI
r
7
7/6
I>51
I>>51
Io>51N Io>>51N
ext
0 off
I on
Trip
reset
MT10822
Fixed or remote advanced UMI
In addition to the basic UMI functions, this version
provides:
b a "graphic" LCD display for the display of
measurements, parameter/protection settings and alarm
and operating messages.
The number of lines, size of characters and symbols
are in accordance with the screens and language
versions.
The LCD display retrolighting may be activated by
pressing a key.
b a 9-key keypad with 2 operating modes:
v white keys for current operation:
1 display of measurements,
2 display of "switchgear, network diagnosis" data,
3 display of alarm messages,
4 resetting,
5 acknowledgment and clearing of alarms.
v blue keys activated in parameter and protection
setting mode:
7 access to protection settings,
8 access to Sepam parameter setting,
9 used to enter the 2 passwords required to change
protection and parameter settings.
The "↵, r , " ( 4 , 5 , 6 ) keys are used to browse
through the menus and to scroll and accept the values
displayed.
6 "lamp test" keys:
switching on sequence of all the signal lamps.
on
on
I>51
I>>51 Io>51N Io>>51N
0 off
ext
I on
Trip
1
I1= 162A
I2= 161A
I3= 163A
9
8
7
6
RMS
2
RMS
RMS
3
clear
reset
5
4
Advanced UMI
Access to data
Access to measurements and
parameters
Example: measurement loop
The measurements and parameters may be accessed
using the metering, diagnosis, status and protection
keys. They are arranged in a series of screens as
shown in the diagram opposite.
b the data are split up by category in 4 loops,
associated with the following 4 keys:
v key
: measurements
v key
: switchgear diagnosis and additional
measurements
v key
: general settings
v key
: protection settings.
b when the user presses a key, the system moves on
to the next screen in the loop. When a screen includes
more than 4 lines, the user moves about in the screen
via the cursor keys ( , ).
MT10885
Use
energizing
of Sepam
Measurements
numerical values
I rms
Measurements
bar graphs
clear
Average I
clear
Overcurrent
Io
bar graph
Temperatures
1 to 4
temperature sensors
Temperatures
5 to 8
temperature sensors
There are 3 levels of use:
b operator level: used to access all the screens in read
mode and does not require any passwords
b protection setter level: requires the entry of the first
password (
key), allows protection setting (
key)
b parameter setter level: requires the entry of the
second password (
key), allows modification of the
general settings as well (
key).
Only general setters may modify the passwords.
The passwords have 4 digits.
MT10808
Protection and parameter setting modes
on
I>51
I>>51 Io>51N Io>>51N ext
0 off
I on Trip
7
passwords
apply
cancel
clear
reset
7/7
Advanced UMI
White keys for current operation
Use
The "metering" key is used to display the variables
measured by Sepam.
MT10829
key
on
I>51
I>>51 Io>51N Io>>51N
0 off
ext
I1= 162A
I2= 161A
I3= 163A
MT10286
The “diagnosis” key provides access to diagnostic data
on the breaking device and additional measurements,
to facilitate fault analysis.
on
I>51
I>>51 Io>51N Io>>51N
TripI1
TripI2
TripI3
TripIo
=
=
=
=
RMS
RMS
reset
0 off
ext
The “alarms” key is used to consult the 16 most recent
alarms that have not yet been cleared.
MT10287
key
on
I>51
I>>51 Io>51N Io>>51N
I on Trip
162A
161A
250A
250A
clear
7
reset
0 off
ext
I on Trip
0 Io FAULT
-1
-2
-3
clear
7/8
Trip
RMS
clear
key
I on
reset
Advanced UMI
White keys for current operation
Use
key
The “reset” key resets Sepam (extinction of signal
lamps and resetting of protection units after the
disappearance of faults).
The alarm messages are not erased.
MT10906
reset
on
I>51
I>>51 Io>51N Io>>51N
2001 / 10 / 06
0 off
ext
I on Trip
12:40:50
PHASE FAULT 1A
Trip I1 = 162A
Trip I2 = 161A
Trip I3 = 250A
clear
key
When an alarm is present on the Sepam display, the
"clear" key is used to return to the screen that was
present prior to the appearance of the alarm or to a less
recent unacknowledged alarm. Sepam is not reset.
In the metering or diagnosis or alarm menus, the "clear"
key may be used to reset the average currents, peak
demand currents, running hours counter and alarm
stack when they are shown on the display.
MT10833
clear
reset
on
I>51
I>>51 Io>51N Io>>51N
0 off
ext
I on Trip
I1max = 180A
I2max = 181A
I3max = 180A
clear
reset
7
Press the "lamp test" key for 5 seconds to start up a
LED and display test sequence.
When an alarm is present, the "lamp test" key is
disabled.
MT10283
key
on
I>51
I>>51 Io>51N Io>>51N
0 off
ext
I1= 162A
I2= 161A
I3= 163A
I on
Trip
RMS
RMS
RMS
clear
reset
7/9
Advanced UMI
Blue keys for parameter and
protection setting
Use
The “status” key is used to display and enter the Sepam
general settings. They define the protected equipment
characteristics and the different optional modules.
MT10810
key
on
I>51
I>>51 Io>51N Io>>51N
0 off
ext
I on Trip
General settings
language
frequency
English
50 Hz
French
60 Hz
A/B choice (A actif)
=A
clear
reset
The “protection” key is used to display, set and enable
or disable the protection units.
MT10811
key
on
I>51
I>>51 Io>51N Io>>51N
0 off
ext
I on Trip
Off
On
50/51 1 A
Trip
= inverse
Curve
Threshold = 110 A
Delay
= 100 ms
clear
7
The "wrench" key is used to enter the passwords for
access to the different modes:
b protection setting
b parameter setting.
and return to "operating" mode (with no passwords).
MT10808
key
on
I>51
I>>51 Io>51N Io>>51N ext
reset
0 off
I on Trip
passwords
apply
cancel
clear
7/10
reset
Advanced UMI
Blue keys for parameter and
protection setting
Use
key
The
key is used to confirm the protection settings,
parameter settings and passwords.
MT10812
reset
on
I>51
I>>51 Io>51N Io>>51N
0 off
ext
I on Trip
Off
On
50/51 1 A
Trip
= SIT
Curve
Threshold = 550 A
Delay
= 600 ms
clear
key
When there are no alarms on the Sepam display and
the user is in the status, protection or alarm menu, the
key is used to move the cursor upward.
MT10812
clear
reset
on
I>51
I>>51 Io>51N Io>>51N
0 off
ext
I on Trip
Off
On
50/51 1 A
Trip
= SIT
Curve
Threshold = 550 A
Delay
= 600 ms
clear
reset
7
When there are no alarms on the Sepam display and
the user is in the status, protection or alarm menu, the
key is used to move the cursor downward.
MT10812
key
on
I>51
I>>51 Io>51N Io>>51N
50/51 1 A
0 off
ext
I on Trip
Off
On
Trip
= SIT
Curve
Threshold = 550 A
Delay
= 600 ms
clear
reset
7/11
Use
Advanced UMI
Data entry principles
Use of passwords
Modification of passwords
Only the parameter setting qualification level (2 keys) or the SFT2841 allow
modification of the passwords. Passwords are modified in the general settings
screen,
key.
Sepam has two 4-digit passwords:
b the first password, symbolized by a key, is used to
modify the protection settings
b the second password, symbolized by two keys, is
used to modify the protection settings and all the
general settings.
The 2 factory-set passwords are: 0000
Entry of passwords
Press the key to display the following screen:
MT10816
passwords
Loss of passwords
If the factory-set passwords have been modified and the latest passwords entered
have been irretrievably lost by the user, please contact your local after-sales service
representative.
Entry of parameters or settings
Principle applicable to all Sepam screens
(example of phase overcurrent protection)
b enter the password
b access the corresponding screen by successively pressing the
key
b move the cursor by pressing the
key for access to the desired field (e.g. curve)
b press the
key to confirm the choice, then select the type of curve by pressing
the
or
key and confirm by pressing the
key
b press the
key to reach the following fields, up to the apply
box. Press
the
key to confirm the setting.
reset
reset
apply
cancel
reset
Press the
key to position the cursor on the first digit.
0 XXX
Scroll the digits using the cursor keys ( ,
), then
confirm to go on to the next digit by pressing the
key.
Do not use characters other than numbers 0 to 9 for
each of the 4 digits.
When the password for your qualification level is
entered, press the
key to position the cursor on the
box. Press the
key again to confirm.
apply
When Sepam is in protection setting mode, a key
appears at the top of the display.
When Sepam is in parameter setting mode, two keys
appear at the top of the display.
reset
reset
MT10817
reset
Off
On
Trip
curve
= definitive
thershold = 120 A
delay
7
= 100 ms
response time
= definitive
curve
delay
apply
= 0 ms
cancel
Access to the protection setting or parameter setting
modes is disabled:
b by pressing the key
b automatically if no keys are activated for more than 5
minutes.
7/12
Entry of numerical values
(e.g. current threshold value).
b position the cursor on the required field using the
keys and confirm the
choice by pressing the
key
b select the first digit to be entered and set the value by pressing the
keys
(choice of
. 0……9)
b press the
key to confirm the choice and go on to the following digit.
The values are entered with 3 significant digits and a period.
The unit (e.g. A or kA) is chosen using the last digit.
b press the
key to confirm the entry, then press the key for access to the following
field
b all of the values entered are only effective after the user confirms by selecting the
apply
box at the bottom of the screen and presses the
key.
reset
reset
reset
reset
Use
Default parameter setting
The Sepam units are delivered with default parameter
setting and protection setting according to the type of
application.
These "factory" settings are also used with the
SFT2841 software:
b for the creation of new files in not connected mode
b for a return to the "factory" settings in connected
mode.
S20, T20 and M20 applications
Hardware configuration
b identification: Sepam xxxx
b model: UX
b MES module: absent
b MET module: absent
b MSA module: absent
b DSM module: present
b ACE module: absent.
Output parameter setting
b outputs used: O1 to O4
b shunt trip units: O1, O3
b undervoltage trip units: O2, O4
b impulse mode: no (latched).
Program logic
b circuit breaker control: no
b logic discrimination: no
b logic input assignment: not used.
General characteristics
b network frequency: 50 Hz
b group of settings: A
b enable remote setting: no
b working language: English
b CT rating: 5 A
b number of CTs: 3 (l1, l2, l3)
b rated current In: 630 A
b basic current Ib: 630 A
b integration period: 5 mn
b residual current: 3I sum
b pre-trig for disturbance recording: 36 periods.
Protection functions
b all the protections are "off"
b the settings comprise values and choices that are informative and consistent with
the general characteristics by default (in particular rated current In)
b tripping behavior:
v latching: yes
v activation of output O1: yes
b disturbance recording triggering: with.
Control matrix
Each Sepam has program logic by default according to the type (S20, T20,…) as well
as messages for the different signal lamps.
The functions are assigned according to the most frequent use of the unit. This
parameter setting may be customized if required using the SFT2841 software
package.
b S20 application:
v activation of output O2 upon protection tripping
v activation of indicators according to front panel markings
v watchdog on output O4
v disturbance recording triggering upon signal pick-up.
b complements for T20 application:
v activation of O1 without latching upon tripping of temperature monitoring 1 to 7
v activation of O1 and indicator L9 without latching upon thermal overload tripping.
b complements for M20 application:
v activation of outputs O1 and O2 and indicator L9 upon tripping of functions 37
phase undercurrent) and 51 LR (locked rotor)
v activation of output O2 upon tripping of function 66 (starts per hour)
b latching for function 51 LR.
7/13
7
Use
Default parameter setting
B21(1) and B22 applications
Protection functions
b all the protection functions are "off"
b the settings comprise values and choices that are informative and consistent with
the general characteristics by default
b latching: no
b disturbance recording triggering: with.
Hardware configuration
b identification: Sepam xxxx
b model: UX
b MES module: absent
b MET module: absent
b MSA module: absent
b DMS module: present
b ACE module: absent.
Output parameter setting
b outputs used: O1 to O4
b shunt coils: O1 to O3
b undervoltage coils: O4
b impulse mode: no (latched).
Program logic
b circuit breaker control: no
b assignment of logic inputs: not used.
General characteristics
b network frequency: 50 Hz
b enable remote setting: no
b working language: English
b primary rated voltage (Unp): 20 kV
b secondary rated voltage (Uns): 100 V
b voltages measured by VTs: V1, V2, V3
b residual voltage: sum of 3Vs
b pre-trig for disturbance recording: 36 periods.
Control matrix
b assignment of output relays and indicators according to chart:
Functions
Outputs
B21
O1
B22
O2
Indicators
O3
O4
L1
b
L2
L3
L4
7/14
L7
L8
L9
27D-2
27D-2
27R
27R
27-1
27-1
27-2
27-2
b
b
b
27S-1
27S-1
b
b
b
27S-2
27S-2
b
b
b
27S-3
27S-3
b
b
59-1
59-1
b
b
b
b
59-2
59-2
59N-1
59N-1
59N-2
59N-2
b
81H
81H
b
81L-1
81L-1
81L-2
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
b
81L-2
b
b
b
81R
b
b
b
Indicator marking
L1 : U < 27
L2 : U < 27D
L3 : U < 27R
L4 : U > 59
L5 : U > 59N
L6 : F > 81H
L7 : F < 81L
L8 : F << 81L
L9 : Trip
(1) Type B21 performs the same functions as cancelled type B20.
L6
27D-1
b disturbance recording triggering upon signal pick-up
b watchdog on output O4.
7
L5
b
27D-1
Commissioning
Commissioning: principles and
method
Protection relay testing
Protection relays are tested prior to commissioning, with the dual aim of maximizing
availability and minimizing the risk of malfunctioning of the assembly being
commissioned. The problem consists of defining the consistency of the appropriate
tests, keeping in mind that the relay is always involved as the main link in the
protection chain.
Therefore, protection relays based on electromechanical and static technologies
must be systematically submitted to detailed testing, not only to qualify relay
commissioning, but also to check that they actually are in good operating order and
maintain the required level of performance.
The Sepam concept makes it possible to do away with such testing, since:
b the use of digital technology guarantees the reproducibility of the performances
announced
b each of the Sepam functions has undergone full factory-qualification
b an internal self-testing system provides continuous information on the state of the
electronic components and the integrity of the functions (e.g. automatic tests
diagnose the level of component polarization voltages, the continuity of the analog
value acquisition chain, non-alteration of RAM memory, absence of settings outside
the tolerance range) and thereby guarantees a high level of availability.
Sepam is therefore ready to operate without requiring any additional
qualification testing that concerns it directly.
Sepam commissioning tests
The preliminary Sepam commissining tests may be limited to a commissioning
check, i.e.:
b checking of compliance with BOMs and hardware installation diagrams and rules
during a preliminary general check
b checking of the compliance of the general settings and protection settings entered
with the setting sheets
b checking of current or voltage input connection by secondary injection tests
b checking of logic input and output connection by simulation of input data and
forcing of output status
b confirmation of the complete protection chain
b checking of the connection of the optional MET148-2 and MSA141 modules.
The various checks are described further on.
General principles
b all the tests should be carried out with the MV cubicle completely isolated
and the MV circuit breaker racked out (disconnected and open)
b all the tests are to be performed in the operating situation: no wiring or
setting changes, even temporary changes to facilitate testing, are allowed.
b the SFT2841 parameter setting and operating software is the basic tool for all
Sepam users. It is especially useful during Sepam commissioning tests. The tests
described in this document are systematically based on the use of that tool.
The commissioning tests may be performed without the SFT2841 software for
Sepam units with advanced UMIs.
Method
For each Sepam:
b only carry out the checks suited to the hardware configuration and the functions
activated
(A comprehensive description of all the tests is given further on)
b use the test sheet provided to record the results of the commissioning tests.
7/15
7
Commissioning
Testing and metering equipment
required
Generators
b sinusoidal AC current generator:
v 50 or 60 Hz frequency (according to the country)
v single-phase type, adjustable from 0 to 50 A rms
v with connector suited to the built-in test terminal box in the current input connection
diagram
b sinusoidal AC voltage generator:
v 50 or 60 Hz frequency (according to the country)
v single-phase type, adjustable from 0 to 150 V rms
v with connector suited to the built-in test terminal box in the voltage input
connection diagram
b DC voltage generator:
v adjustable from 48 to 250 V DC
v for adaptation to the voltage level of the input being tested
v with electric cord and clamps, wire grip or touch probes.
Metering devices
b 1 ammeter, 0 to 50 A rms
b 1 voltmeter, 0 to 150 V rms.
Computer equipment
b
v
v
v
v
v
b
b
PC with minimal configuration:
MicroSoft Windows 95 / 98 / XP / 2000 / NT 4.0
133 MHz Pentium processor
64 MB of RAM (or 32 MB with Windows 95/98)
64 MB free on hard disk
CD-ROM drive
SFT2841 software
CCA783 serial connection cord between the PC and Sepam.
Documents
b complete connection diagram of Sepam and additional modules, with:
v phase current input connection to the corresponding CTs via the test terminal box
v residual current input connection
v phase voltage input connection to the corresponding VTs via the test terminal box
v residual voltage input connection to the corresponding VTs via the test terminal
box
v logic input and output connection
v temperature sensor connection
v analog output connection
b hardware BOMs and installation rules
b group of Sepam parameter and protection settings, available in paper format.
7
7/16
Commissioning
General examination and
preliminary actions
Checking to be done prior to energizing
Apart from the mechanical state of the equipment, use the diagrams and BOMs
provided by the contractor to check:
b identification of Sepam and accessories determined by the contractor
b correct earthing of Sepam (via terminal 17 of the 20-pin connector)
b conformity of Sepam auxiliary voltage (indicated on the label stuck to the right side
plate of the base unitbase unit) with the auxiliary supply voltage of the switchboard
(or cubicle)
b correct connection of the auxiliary voltage (terminal 1: AC or positive polarity;
terminal 2: AC or negative polarity)
b presence of a residual current measurement core balance CT and/or additional
modules connected to Sepam, when applicable
b presence of test terminal boxes upstream from the current inputs and voltage
inputs
b conformity of connections between Sepam terminals and the test terminal boxes.
Connections
Check that the connections are tightened (with equipment non-energized).
The Sepam connectors must be correctly plugged in and locked.
Energizing
Switch on the auxiliary power supply.
Check that Sepam performs the following initialization sequence, which lasts
approximately 6 seconds:
b green ON and red
indicators on
b red
indicator off
b pick-up of "watchdog" contact.
The first screen displayed is the phase current or phase voltage metering screen
according to the application.
Implementation of the SFT2841 software for PC
b start up the PC
b connect the PC RS232 serial port to the communication port on the front panel of
Sepam using the CCA783 cord
b start up the SFT2841 software, by clicking on the related icon
b choose to connect to the Sepam to be checked.
Identification of Sepam
b note the Sepam serial number given on the label stuck to the right side plate of the
base unit
b note the Sepam type and software version using the SFT2841 software, "Sepam
Diagnosis" screen
b enter them in the test sheet.
7
7/17
Commissioning
Checking of parameter and
protection settings
Determination of parameter and protection settings
All of the Sepam parameter and protection settings are determined ahead of time by
the design department in charge of the application, and should be approved by the
customer.
It is presumed that the study has been carried out with all the attention necessary, or
even consolidated by a network coordination study.
All of the Sepam parameter and protection settings should be available at the time of
commissioning:
b in paper file format (with the SFT2841 software, the parameter and protection
setting file for a Sepam may be printed directly or exported in a text file for editing)
b and, when applicable, in the format of a file to be downloaded into Sepam using
the SFT2841 software.
Checking of parameters and protection settings
Check to be made when the Sepam parameter and protection settings have not been
entered or downloaded during commissioning testing, to confirm the conformity of
the parameter and protection settings entered with the values determined during the
study.
The aim of this check is not to confirm the relevance of the parameter and protection
settings.
b go through all the parameter and protection setting screens in the SFT2841
software, in the order proposed in guided mode
b for each screen, compare the values entered in the Sepam with the values
recorded in the parameter and protection setting file
b correct any parameter and protection settings that have not been entered correctly,
proceeding as indicated in the "Expert UMI" section of the Use chapter of this
manual.
Conclusion
Once the checking has been done and proven to be conclusive, as of that phase, the
parameter and protection settings should not be changed any further and are
considered to be final.
In order to be conclusive, the tests which follow must be performed with these
parameter and protection settings; no temporary modification of any of the values
entered, with the aim of facilitating a test, is permissible.
7
7/18
Checking of phase current input
connection
Commissioning
Description:
Check to be carried out for Sepam S20, T20 or M20.
Procedure:
DE50567
b to inject a current into the phase 1 input, connect the single-phase generator to the
test terminal box using the plug provided, in accordance with the diagram below:
b turn on the generator
b inject the CT rated secondary current, i.e. 1 A or 5 A
b use the SFT2841 software to check that the phase 1 current value is approximately
equal to the CT rated primary current
b if the residual current is calculated by taking the sum of the 3 phase currents, use
the SFT2841 software to check that the residual current value is approximately equal
to the CT rated primary current
b if the residual current is measured via 3 phase CTs connected to a CSH30
interposing ring CT, use the SFT2841 software to check that the residual current
value is approximately equal to the CT rated primary current
b turn off the generator
b proceed in the same way for the other 2 phase current inputs
b at the end of the test, put the cover back on the test terminal box.
7/19
7
Checking of residual current input
connection
Commissioning
Description:
Check to be carried out for Sepam S20, T20 or M20, when the residual current is
measured by a specific sensor:
b CSH120 or CSH200 core balance CT
b another core balance CT connected to an ACE990 interface
b a single 1 A or 5 A CT encompassing the 3 phases, connected to a CSH30
interposing ring CT.
Procedure:
DE50340
b connect the single-phase current generator to inject current into the primary circuit
of the core balance CT or the CT, in accordance with the diagram below:
7
b turn on the generator
b inject a 5 A primary residual current
b use the SFT2841 software to check that the residual current value is approximately
equal to 5 A
b turn the generator off.
7/20
Checking phase voltage input
connection
Commissioning
Description:
Check to be carried out for Sepam B21 or B22.
Procedure:
DE50341
b to apply a phase-to-neutral voltage to the phase 1 voltage input, connect the
single-phase voltage generator to the test terminal box using the plug provided, in
ccordance with the diagram below:
b turn the generator on
b apply the VT rated secondary phase-to-neutral voltage (Uns/3)
b use the SFT2841 software to check that the phase-to-neutral voltage V1 value is
equal to the VT rated primary phase-to-neutral voltage (Unp/3)
b if the residual voltage is calculated by the sum of the 3 voltages, use the SFT2841
software to check that the residual voltage is approximately equal to the VT rated
primary phase-to-neutral voltage (Unp/√3)
b turn the generator off
b proceed in the same way for the other 2 phase voltage inputs
b at the end of the test, put the cover back on the test terminal box.
7/21
7
Checking of residual voltage input
connection
Commissioning
Description:
Check to be carried out for Sepam B21 or B22, when the residual voltage is
measured by 3 VTs on the secondary circuits connected in an open delta
arrangement.
Procedure:
DE50342
b connect the single-phase voltage generator to the terminal test box using the plug
provided, in accordance with the diagram below:
7
b turn on the generator
b apply the VT rated secondary phase-to-neutral voltage (Uns/3)
b use the SFT2841 software to check the residual voltag value Vo
b Vo should be equal to the VT rated primary phase-to-neutral voltage (Unp/3 or
Vnp) if the VTs deliver Uns/3 to the secondary circuit
b Vo should be equal to the VT rated primary phase-to-phase voltage (Unp or
3Vnp) if the VTs deliver Uns/3 to the secondary circuit
b turn the generator off
b put the cover back on the terminal test box.
7/22
Commissioning
Checking of logic input and output
connection
MT10588
Checking of logic input connection
Procedure
Proceed as follows for each input:
b if the input supply voltage is present, use an electric cord to short-circuit the
contact that delivers logic data to the input
b if the input supply voltage is not present, apply a voltage supplied by the DC
voltage generator to the terminal of the contact linked to the chosen input, being sure
to comply with the suitable polarity and level
b observe the change of status of the input using the SFT2841 software, in the
"Input, output, indicator status" screen
b at the end of the test, if necessary, press the Sepam Reset key to clear all
messages and deactivate all outputs.
SFT2841 "Input, output, indicator status" screen.
MT10847
Checking of logic output connection
Procedure
Check carried out using the "Output relay test" function, activated via the SFT2841
software, in the "Sepam Diagnosis" screen.
Only output O4, when used for the watchdog, can be tested.
This function requires prior entry of the "Parameter setting" password.
b activate each output relay using the buttons in the SFT2841 software
b the activated output relay changes status over a period of 5 seconds
b observe the change of status of the output relay through the operation of the
related switchgear (if it is ready to operate and is powered), or connect a voltmeter to
the terminals of the output contact (the voltage cancels itself out when the contact
closes)
b at the end of the test, press the Sepam Reset key to clear all messages and
deactivate all outputs.
SFT2841 "Sepam Diagnosis - output relay test" screen.
7
7/23
Commissioning
Validation of the complete
protection chain
Principle:
The complete protection chain is validated during the simulation of a fault that causes
tripping of the breaking device by Sepam.
Procedure:
b select one of the protection functions that triggers the breaking device
b according to the type of Sepam, inject a fault current or voltage
b observe the tripping of the breaking device.
7
7/24
Commissioning
Checking of optional module
connection
Checking of temperature sensor inputs to
the MET148-2 module
The temperature monitoring function provided by Sepam T20 or M20 units checks
the connection of each sensor that is configured.
An "RTD FAULT" alarm is generated whenever one of the sensors is detected as
being short-circuited or disconnected (absent).
To identify the faulty sensor or sensors:
b display the temperature values measured by Sepam T20 or M20 using the
SFT2841 software
b check the consistency of the temperatures measured:
v the temperature displayed is "****" if the sensor is short-circuited (T < -35 °C)
v the temperature displayed is "-****" if the sensor is disconnected (T > 205 °C).
Checking of analog output connection to the
MSA141 module
b identify the measurement associated by parameter setting to the analog output
using the SFT2841 software
b simulate, if necessary, the measurement linked to the analog output by injection
b check the consistency between the value measured by Sepam and the indication
given by the device connected to the analog output.
7
7/25
Test sheet
Sepam series 20
Commissioning
Project:
Type of Sepam
Switchboard:
Serial number
Cubicle:
Software version
V
Overall checks
Check of the box v when the check has been made and been conclusive
Type of check
Preliminary general examination, prior to energizing
v
v
v
v
v
v
v
v
Energizing
Parameter and protection settings
Logic input connection
Logic output connection
Validation of the complete protection chain
Analog output connection to the MSA141 module
Temperature sensor input connection to the MET148-2 module (for type T20 or M20)
Checking of Sepam S20, T20 or M20 current inputs
Type of check
Phase current input
connection
Test performed
Secondary injection of CT
rated current, i.e. 1 A or 5 A
Result
CT rated primary current
Display
I1 =
v
I2 =
I3 =
Residual current value
obtained by 3 phase CTs
Secondary injection of CT
rated current, i.e. 1 A or 5 A
CT rated primary current
Residual current input
Injection of 5 A into primary Injected current value
connection to a specific
circuit of core balance CT or
sensor:
CT
b CSH120 or CSH200
b other core balance CT +
ACE990
b 1 x 1 A or 5 A CT + CSH30
7
I0 =
v
I0 =
v
Checking of Sepam B21 or B22 voltage inputs
Type of check
Phase voltage input
connection
Test performed
Secondary injection of VT
rated phase-to-neutral
voltage Uns/3
Result
Display
VT rated primary phase-to-neutral
voltage Unp/3
V1 =
v
V2 =
Residual voltage value
obtained by 3 phase VTs
Connection of residual
voltage input
Tests performed on:
By:
Comments:
7/26
Secondary injection of VT
rated phase-to-neutral
voltage Uns/3
Secondary injection of
voltage Uns/3
V3 =
VT rated primary phase-to-neutral
voltage Unp/3
V0 =
Residual voltage
= Unp/3 (if Uns/3 VT)
= Unp (if Uns/3 VT)
Signatures
V0 =
v
v
Maintenance
Sepam has a large number of self-tests that are carried
out in the base unit and additional modules. The
purpose of the self-tests is:
b to detect failures that may lead to nuisance tripping
or the failure to trip when a fault occurs
b to put Sepam in the fail-safe position to avoid user
errors
b to notify the operator that a maintenance operation is
required.
The "Sepam diagnosis" screen of the SFT2841
software provides access to data on the status of the
base unit and optional modules.
Shutdown of the base unit in fail-safe position
MT10587
Commissioning
The base unit goes into the fail-safe position in the following conditions:
b detection of an internal failure by the self-tests
b sensor interface connector missing (CCA630, CCA670 or CCA640 according to
the type of application)
b no connection of one of the 3 LPCT sensors to the CCA670 (connectors L1, L2
and L3)
b MES module configured but missing.
The fail-safe position is conveyed by:
b ON indicator on
b
indicator on the basis unit steadily on
b relay O4 "watchdog" in fault position
b output relays dropped out
b all protection units inhibited
b display showing fault message
01
b
indicator on DSM303 module (remote advanced UMI option) flashing.
Downgraded operation
SFT2841 "Sepam Diagnosis" screen.
The base unit is in working order (all the protection functions activated are
operational) and indicates that one of the optional modules such as DSM303,
MET148-2 or MSA141 is faulty or else that a module is configured but not connected.
According to the model, this operating mode is conveyed by:
b Sepam with integrated advanced UMI (UD base):
v ON indicator on
v
indicator on the base unit flashing, including when the display is out of order
(off)
v
indicator on the MET or MSA module faulty, steadily on.
The display shows a partial fault message and indicates the type of fault by a code:
v code 1: inter-module link fault
v code 3: MET module unavailable
v code 4: MSA module unavailable.
b Sepam with remote advanced UMI, UX base + DSM303:
v ON indicator on
v
indicator on the base unit flashing
v
indicator on the MET or MSA module faulty, steadily on
v the display indicates the type of fault by a code (same as above).
Special case of faulty DSM303:
v ON indicator on
v
indicator on base unit flashing
v
indicator on DSM steadily on
v display off.
This Sepam operating mode is also transmitted via the communication link.
Temperature sensor fault
Each temperature monitoring function, when activated, detects whether the
temperature sensor associated with the MET148-2 module is short-circuited or
disconnected.
When this is the case, the alarm message "RTD FAULT" is generated.
Since this alarm is common to the 8 functions, the identification of the faulty sensor
or sensors is obtained by looking up the measured values:
b measurement displayed "****" if the sensor is short-circuited (T < -35 °C)
b measurement displayed "-****" if the sensor is disconnected (or T > +205 °C).
Replacement and repair
When Sepam or a module is considered to be faulty, have it replaced by a new
product or module, since the components cannot be repaired.
7/27
7
Commissioning
7
7/28
Notes
Commissioning
Notes
7
7/29
Postal address:
Electrical Distribution Communication
38050 Grenoble cedex 9 - France
Tel : +33 (0)4 76 57 60 60
http://www.schneider-electric.com
http://sepamrelay.com
PCRED301005EN/1
ART.08552
As standards, specifications and designs change from time to time, please ask for cofirmation
of the information given in this publication.
This document has been printed
on ecological paper.
Design: Ameg
Publication: Schneider Electric
Impression:
04-2003
03146730EN-F0 © 2003 - Schneider Electric - All rights reserved.
Schneider Electric Industries SAS
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement