5.2-1 Protective Relays Motor Protection

5.2-1 Protective Relays Motor Protection
January 2005
Protective Relays
Motor Protection
5.2-1
Sheet 0239
General Description — MP-3000
MP-3000
Motor Protection Relay
functions can be used with either a
zero sequence ground CT or from the
residual connection of the phase CTs.
The zero sequence ground CT provides greater ground fault sensitivity
than the residual connection. The relay
is programmable for 60 Hz or 50 Hz
operation.
The MP-3000 motor protection relay
has two discrete inputs, four Form C
(1 NO and 1 NC) contacts and one
4 to 20 mA analog output. The relay
provides maximum user flexibility to
configure the I/O. All inputs and outputs (except for the trip output) are
user-programmable. In addition, the
relay has 10 LEDs for the indication of
protection on, program mode, monitor
mode, view setting mode, history
mode, log mode, trip, alarm, auxiliary
1 and auxiliary 2 operation. A test page
in the program mode provides display
indication of the discrete input states
and testing of the output relays, target
LEDs and analog circuit.
MP-3000 Motor Protection Relay
General Description
Eaton’s Cutler-Hammer MP-3000 motor
protection relay is a multi-functional
microprocessor-based protective relay
for the protection of any size motor at
all voltage levels. It is most commonly
applied on medium voltage starters
and on critical or larger motors. The
MP-3000 relay is a current only device
that provides complete and reliable
motor protection, monitoring and
starting control functions.
The MP-3000 motor protection relay
is available in either a fixed mount,
semi-flush case or in a semi-flush
quick-release drawout case. Both
housings are compact and fit a
standard IQ cutout.
The optional quick-release drawout
case features two-stage contact disconnection and self-shorting CT circuit
terminals. A spare self-shorting
terminal pair is available for use as
relay removal alarm or for continuous
motor operation (non-failsafe mode)
on relay removal. The optional
communication module is externally
mounted on the fixed mount case
and internally mounted in the
drawout case.
The MP-3000 motor protection relay
has three phase and one ground
current inputs. Both a 5 ampere and
1 ampere version are available. The
ground protection and metering
CA08104001E
designs and operating parameters
for optimum operation and protection
while minimizing nuisance tripping.
The MP-3000 motor protection relay
utilizes a patented protection algorithm
and measurement technique based on
proven positive and negative (unbalance) sequence current sampling and
true rms calculations.
Features
■
■
1
2
■
■
■
■
■
■
■
■
Microprocessor-based.
Self diagnostics.
User-friendly interface.
Large LED display.
Built-in help program.
Built-in test mode.
LED mode and target indication.
Remote communications.
Programmable discrete inputs.
Programmable outputs.
Protection Features
Optimum Motor Protection
■
■ I2t
■
■
■
■
■
■
■
■
■
■
overload protection (49/51).
Locked rotor (49S/51).
Ultimate trip current (51).
Negative sequence phase
unbalance (46).
Instantaneous overcurrent (50).
Ground fault protection (50G).
RTD trip and alarm with URTD
module (49/38).
Underload trip (37).
Starts per time (66).
Jam or stall (51R).
Auto or manual reset (86).
Failsafe or non-failsafe trip modes.
3
4
5
6
7
8
9
10
11
12
Alarming
■
Ground fault.
overload.
■ Jam/stall.
■ Underload.
■ Phase unbalance.
13
■ I2t
14
15
Table 5.2-1. MP-3000 Catalog Numbers
Description
Catalog
Number
Motor Protection in Fixed Case, 5 Ampere CT, Communication Capable with PONI
Motor Protection in Drawout Case, 5 Ampere CT, No Communication
Motor Protection in Drawout Case, 5 Ampere CT, with INCOM Communication
MP-3000
MP-3001
MP-3002
Motor Protection in Fixed Case, 1 Ampere CT, Communication Capable with PONI
Motor Protection in Drawout Case, 1 Ampere CT, No Communication
Motor Protection in Drawout Case, 1 Ampere CT, with INCOM Communication
MP-3100
MP-3101
MP-3102
Motor Protection in Fixed Case, 5 Ampere CT, with INCOM Communication
Motor Protection in Fixed Case, 5 Ampere CT, with INCOM, URTD Module & Fiber
Motor Protection in Fixed Case, 1 Ampere CT, with INCOM Communication
Motor Protection in Fixed Case, 1 Ampere CT, with INCOM, URTD Module & Fiber
MP-3000 INCOM
MP-3000VPI
MP-3100 INCOM
MP-3100VPI
For more information visit: www.EatonElectrical.com
ii
General
A user-friendly operator interface and
display provides quick access to the
settings, monitored values, motor
history and operational logs. Large
LED alphanumeric character display
provides easy viewing from any angle
in any light. Simple keypad operation
provides quick and easy navigation
through all settings and stored data.
The program mode and emergency
override buttons are access restricted
via a latched cover which can be sealed
if required. An integrated help function
provides an online description display of
functions, abbreviations and operations.
The MP-3000 motor protection relay
has been designed for maximum
motor operation and protection. It
permits running the motor as close to
its design limits while protecting it
against excessive heating and damaging overload conditions. The MP-3000
field proven protection algorithms
were developed based on motor
i
16
17
18
19
Protective Relays
Motor Protection
5.2-2
January 2005
Sheet 0240
General Description — MP-3000
i
Control Features
❑
■
❑
ii
1
2
■
■
■
■
3
■
■
■
4
5
6
■
■
■
■
7
8
■
10
11
■
12
13
14
15
16
18
19
Motor currents:
❑ Average current (I ave)
❑ Individual phase and ground
current in primary amperes
❑ % of full load
❑ % phase unbalance
RTD temperatures:
❑ Individual winding
❑ Motor bearing
❑ Load
❑ Auxiliary temperatures
Motor conditions:
❑ % of I2t thermal bucket
❑ Time before start
❑ Remaining starts allowed
❑ Oldest start time
History
■
17
❑
❑
❑
❑
❑
❑
❑
■
■
Monitoring Functions
■
9
Transition for reduced voltage starts:
❑ Transition on current level
❑ Transition on time
❑ Transition on current level or time
❑ Transition on current level
and time
Incomplete sequence monitoring.
Permits number of cold starts.
Limits number of starts per time.
Time between starts.
Anti-backspin time delay.
Mechanical load shedding.
Zero speed switch for long
acceleration motors.
Motor stop input for synchronous.
motor applications.
Remote trip input.
Differential trip input.
Emergency override.
■
Motor history:
❑ Operational counter
❑ Run time
❑ Highest starting and running
currents
❑ Highest % phase unbalance
❑ Maximum winding, bearing and
load RTD temperatures
❑ Number of emergency overrides
Trip history (number of trips):
❑ Ground faults
❑ Overloads
❑ Instantaneous overcurrent
❑ JAM
❑ Underload
Phase unbalance
RTDs
Phase reversal
Incomplete sequence
Remote, differential
Communication
Starts exceeded
Time between starts
Transition
Alarms history (number of alarms):
❑ Ground faults
❑ Overloads
❑ JAM
❑ Underload
❑ Phase unbalance
❑ RTDs
❑ Starts exceeded
Total history (record which cannot
be reset):
❑ Total trips
❑ Run time
❑ Operations count
Logging
■
Log book (chronological list of
last 100 events with date and
time stamp).
■ Event log (detailed information of
last 20 trips and alarms with date
and time stamp).
■ Start log (data on most recent four
starts with date and time stamp).
User Interface
The MP-3000 motor protection relay
has a user-friendly interface that
makes it easy to retrieve important
information or make setting changes.
LEDs provide visual indication of
display and keypad mode. The pushbuttons are clearly labeled and quickly
access the desired information.
Protection Functions
The MP-3000 motor protection relay
provides protection against motor
overloads, short circuits and abnormal
operating conditions.
I2t Overload
Motor overloads are typically limited
by the rotor thermal capabilities but
the measuring quantities are from
the stator. This requires accurate measurements and good motor thermal
models to provide reliable protection.
For more information visit: www.EatonElectrical.com
The MP-3000 motor protection relay
utilizes a field proven measurement
and motor thermal protection model.
The relay samples the current waveforms 36 times per cycle providing
accurate measurements of the positive
and negative sequence currents. The
negative sequence component of
current causes greater heating effect
on the rotor and has a greater impact
on the thermal model in the relay.
This same algorithm has been used
to protect thousands of motors
since 1984.
The MP-3000 motor protection relay
overload protection is easy to set and
apply. Simply input motor nameplate
information and CT ratios and the
characteristic is automatically set.
When utilizing the MP-3000 motor
protection relay, it is recommended
that the ratio of CT primary rating to
the motor full load amperes (CT Pri/
Motor FLA) is selected to fall between
0.25 and 1.5. The thermal model
adapts its tripping characteristics if
RTDs are connected.
Instantaneous Overcurrent
The MP-3000 motor protection relay
provides an instantaneous phase overcurrent function to trip the motor for
high fault current levels. This function
can be disabled and has an adjustable
time delay on starting to avoid
nuisance tripping on inrush.
Phase Unbalance Protection
Motor supply circuits are often fed
through fuses and can be run with a
single-phase fuse blown. The motor
may still see 3-phase voltage but will
only have current on two phases,
referred to as single-phasing the
motor. The MP-3000 motor protection
relay measures the current unbalance
and can be used to alarm or trip the
motor before damage occurs. Pickup,
start and run timers and a separate
alarm setting are provided.
Ground Fault Protection
A separate circuit measures ground
fault current. A ground CT is recommended for more sensitive protection
against winding fault ground. The
relay ground circuit can be connected
residually from the 3-phase CTs. The
ground fault protection has pickup and
time delay set points or can be disabled.
CA08104001E
Protective Relays
Motor Protection
January 2005
5.2-3
Sheet 0241
General Description — MP-3000
JAM Protection
Anti-backspin
Long Acceleration Motors
The user-selectable JAM function protects motors that are running against a
sudden mechanical jam or stall condition. The common application is on
motors used on crushers, chippers or
conveyors. It detects an increase of
motor current to a level above full
load. Pickup, start and run timers and
a separate alarm setting are provided.
For certain applications, for example,
pumping fluid up a pipe, the motor
may be driven backward for a period
of time after it stops. The MP-3000
relay provides an anti-backspin timer
to prevent starting the motor while it
is spinning in the reverse direction.
The timer begins counting from the
moment a stop is declared by the relay.
Large motors with high inertia loads
may experience starting currents that
exceed the locked rotor current and
time. The MP-3000 motor protection
relay has logic and provisions for a
zero speed switch input to differentiate
between a stall and start condition. If
the motor is spinning then the relay
will not trip on the normal locked rotor
time allowing the motor to start.
Start Control Timers
MP-3000
URT
Protection Functions
49/51 Overload I2T
49S/51 Locked Rotor
51R Jam/Stall
37 Loss of Load/
Underload
46 Phase Loss/
Unbalance
50 Phase Inst. OC
50G Ground Inst. OC
66 Starts per time
period
Motors typically have limits to the
number of cold starts, hot starts, starts
per time period and time between
starts that are permitted without
damage. The MP-3000 motor protection relay incorporates these timers
to prevent starting the motor beyond
its capabilities.
Load Shedding
Figure 5.2-1. MP-3000
Motor Protection Relay Functions
The MP-3000 motor protection relay
provides a mechanical load shedding
feature that can be used to control an
upstream process. The load shedding
function closes a contact on an overload condition to control an upstream
process from adding more load until
the overload condition is gone.
Underload Protection
Emergency Override
Motor
11 RTDs
Fiber Optic Link
The user-selectable underload function is used to detect the loss of load
on the motor. Coupling failure is a
common cause for loss of load.
Pickup, start and run timers and a
separate alarm setting are provided.
Reduced Voltage Starting
The MP-3000 motor protection relay
has a user-programmable feature that
will let the operator reset the start
control timers and thermal overload
bucket. This function is intended for
use in emergency conditions only and
may result in motor damage or failure.
Remote/Differential Trip
One of the binary inputs can be programmed to accept a contact input
from a separate differential relay or
other device to trip the motor. This
provides local and remote target information and utilizes the trip contacts
of the MP-3000 motor protection relay.
It will also record and log the motor
information at the time of the trip.
ii
1
2
3
4
5
6
7
8
9
Motor Starting Profile Time/Current Chart
Motor Starting Profile
The MP-3000 relay records the average
current of the motor for the last two
starts. This information is available
over the communications port. The
motor current can then be plotted and
compared to the motor overload protection curve. Available in PowerPort or
the PowerNet Event Viewer Client.
Eaton’s Cutler-Hammer MP-3000 motor
protection relay provides a transition
and incomplete sequence function for
reduced voltage starting. The user can
select to transition based on the current
level or on time.
i
10
11
12
13
14
15
16
17
18
19
CA08104001E
For more information visit: www.EatonElectrical.com
5.2-4
Protective Relays
Motor Protection
January 2005
Sheet 0242
Technical Data — MP-3000
i
ii
1
L3
L3
L2
L2
L1
L1
CTs
T
Main
Fuse
GFCT
M
C
B
A
M
T2
M
T1
Ground
Gnd.
2
X1 X2
Non-Current
Carrying Ground
CPT
Secondary
Fuses
4
5
Ground
H
1
C
4
STAR
T T
6
STOP
AC Supply
To MP-3000
Additional
Control
7
2
A
H
2
B
G
1
H
2
C
G
2
Trip Contacts
12
11
MP-3000
Back View
with Jumper
Connection
M
M
Alarm Contacts
7
18
8
15
Alarm
19
Auxiliary Trip Contacts
9
To Motor
or Load Device
Under Control
Primary
Fuses
3
5
T3
Aux. Trip
16
Figure 5.2-2. MP-3000 Wiring
10
11 12
42
4
11
6
Transformer
8
0
12
120 Vac
or
240 Vac
2
4
6
13
14
29 30
Customer Remote
Input Contacts
or Pushbuttons
60
6
Non-current
Carrying Ground
15
Figure 5.2-3. MP-3000 Drawout Alternatives for Discrete Input Wiring
16
17
18
19
For more information visit: www.EatonElectrical.com
CA08104001E
Protective Relays
Motor Protection
January 2005
5.2-5
Sheet 0243
Technical Data — MP-3000
i
5.38
(136.7)
4.25
(108.0)
with PONI
2.69
(68.3)
ii
3.01
(76.5)
(76
5)
without PONI
8.90
(226.1)
9.38
(238.3)
1
6.68
(169.7)
4.45
(113.0)
4.69
(119.1)
.06
(1.5) RAD
2.23 4 Places
(56.7)
5.06
(128.5)
.218 (5.5) DIA 10 Places
25
24
-4/20
OUTPUT
3
4
2.53
(64.3)
+4/20
OUTPUT
2
Figure 5.2-5. Drilling Pattern for MP-3000 —
Dimensions in Inches (mm)
5
6
1
7
AUX 2
2
3
8
5
EARTH
GROUND
6
DISCRETE
SOURCE
7
NEUT
8
DISCRETE
IN 1
VAC AUTO SELECT
V
4
120V OR
240V
PONI
Mounting
Bracket
9
10
DISCRETE
COMMON
DISCRETE
IN 2
9
10
11
12
13
Figure 5.2-4. MP-3000 PONI Mounting — Dimensions in Inches (mm)
14
15
16
17
18
19
CA08104001E
For more information visit: www.EatonElectrical.com
Protective Relays
Motor Protection
5.2-6
January 2005
Sheet 0244
Technical Data — MP-3000
i
CT Connections
ii
H
1
A
1
H
1
B
H
2
A
2
3
H
1
C
H
2
B
G
1
H
2
C
G
2
URTD Optical Fiber
Communications
(Preferred Method)
or
URTD Wired
Communication
MP-3000
4
5
6
7
8
9
10
11
+4/20mA Output
25
-4/20mA Output
24
Aux. 2 N/C
1
Aux. 2 Com.
2
Aux. 2 N/O
3
120V OR 240V
4
Earth Ground
5
Discrete Source ➀
6
Neutral
7
Discrete In 1
8
Discrete Com. ➀
9
Discrete In 2
10
23
Shield
22
Common
21
Data
20
Strobe
19
Alarm N/O
18
Alarm Com.
17
Alarm N/C
16
Aux
x.1 N/O
15
Com.
14
13
iip N/O
12
Trip
r Com.
11
Trip
r N/O
12
13
Figure 5.2-6. MP-3000 Terminal Identification
�
14
CAUTION: Do not connect terminals 6 and 9 together.
15
16
17
18
19
For more information visit: www.EatonElectrical.com
CA08104001E
Protective Relays
Motor Protection
January 2005
5.2-7
Sheet 0245
Technical Data — MP-3000
L3
L3
See Below for
Residual Ground Connection
GFCT
T3
CTs
Main
Fuse
M
C
i
ii
L2
M
T2
L1
M
T1
Ground
Ground
X1
To Motor
or
Load Device
Under Control
1
X2
2
Primary
Fuses
3
Non-current
Carrying Ground
CPT
60
Secondary
Fuses
17
START
STOP
42
nd
ac Supply
to MP-3000
Additional
Control
15 16
19
46
48
Trip Contacts
56
54
50
Contacts
29
30
52
54
56
Alarm Contacts
51
48
Alarm
53
Auxiliary Trip Contacts
5
6
M
M
4
44
28
58
29 30
60
6
7
8
Aux. Trip
9
46
10
11
Residual Ground Connection
C
B
A
12
13
Ground
14
21 23 25
22
24
26
Back View of Drawout
Figure 5.2-7. MP-3000 Drawout Typical CT Circuits and Motor Control Wiring
27
28
15
16
17
18
19
CA08104001E
For more information visit: www.EatonElectrical.com
5.2-8
Protective Relays
Motor Protection
January 2005
Sheet 0246
Technical Data — MP-3000
i
Nominal Rating:
ii
1
2
Motor Overload Protection (I2t)
Start Control Functions
120 Vac or 240 Vac
(+10%, -25%)
Full Load
Amperes:
Starts per Time:
Off, 1 to 10 starts
50 or 60 Hz
Locked Rotor
Current:
Time for Starts
per Time:
Off, 1 to 240 minutes
Time Between
Starts:
Off, 1 to 240 minutes
Number of
Cold Starts:
1 to 5 starts
Motor Transition
Current:
10% to 300% FLA
Control Power
Frequency:
Power Use:
Operating
Range:
Ride through
Time:
3
20 VA maximum
URTD: 6 VA maximum
IPONI: 1 VA maximum
120 Vac: 90 – 132 Vac
240 Vac:180 – 264 Vac
30 cycles at
Nominal Vac
Current Inputs
4
5
6
7
8
9
10
Nominal (In):
CT Rating:
Phase Burden:
Ground Burden:
Saturation:
16
85% to
150% FLA
10 to 4000: In
10 to 4000: In
± 2.5% or ±30 ms
For I > 1.1x U.T.C.
Trip Setting Range
Ground Fault (GF): Off, 2% to 55% CT Ratio
GF Start and Run
Time Delay:
Timer Accuracy:
2 to 60 cycles
± 20 ms
Time for Transition: 0 to 1200 seconds
Inc. Sequence
Timer:
Off, 1 to 240 seconds
Long Acceleration
Timer:
Off, 1 to 1200 seconds
Anti-Backspin
Timer:
Off, 1 to 3600 minutes
Instantaneous O.C.: Off, 300% to 1600% FLA
Clock
Accuracy:
Timer Accuracy:
±20 ms
Communications
Discrete Inputs
JAM Trip:
Off, 100% to 1200% FLA
IPONI
Number of
Inputs:
Underload Trip:
Off, 1% to 90% FLA
Type:
Baud Rate:
Protocol:
Functions:
Phase Current:
Ground Current:
Rating:
± 1% of In (5% – 100%)
± 1.5% of In (0% – 55%)
2 Programmable
1.2 VA at 120 Vac
Maximum OFF = 36 Vac
Minimum ON = 86 Vac
Output Contacts
Number of
Outputs:
Phase Unbalance
Trip:
Off, 4% to 40%
Ineg/Ipos
0 – 1200 seconds
JAM, Underload and Phase Unbalance
Time Delay
4 Form C,
Programmable
Momentary:
Make 30 A ac/dc
for 0.25 second
(Resistive)
Break 0.25 A at
250 Vdc
Break 5 A at 120
240 Vac
5A at 120/240 Vac
5A at 30 Vdc
Analog Output
Start Delay Timers: 0 to 120 seconds
Run Delay Timers: 0 to 240 seconds
Timer Accuracy:
±0.5% + 100 ms
Ground Fault:
Off, 2% to 75%
CT Ratio
Overload I2t:
Off, 60% to 99% I2t
JAM:
Off, 100% to 1200%
FLA
Underload:
Phase Unbalance:
Off, 1% to 90% FLA
Off, 4% to 40%
Ineg/Ipos
± 4 to 20 mA
Programmable
Maximum Load:
1 K ohm
Run Delay Timers: 0 to 240 seconds
Accuracy:
1%
Logging
18
±1 minute/month at 25°C
2-wire, FSK
1200 or 9600 Baud
INCOM
Read/write set points
Read metered values
Read trip/alarms
Read events/history
View Starting Profile
MPONI
Type:
Baud Rate:
Protocol:
Functions:
5-wire, 485
1200 or 9600 Baud
Modbus RTU
Read/write set points
Read metered values
Read trip/alarms
Read events/history
View Starting Profile
Alarm Setting Range
Rating:
17
19
1 to 120 seconds
0 to 60 cycles
Continuous:
15
Ultimate Trip
Current:
Phase CT Ratio:
Ground CT Ratio:
Timing Accuracy:
300% to 1200% FLA
IOC Start Time
Delay:
13
14
VA at In
VA at In
x In
Metering Accuracy
11
12
1 A or 5 A
2 x In continuous
40 x In for 1 second
Locked Rotor
Time:
10 to 3000 A
Environmental Ratings
Operating:
Storage:
Humidity:
Temperature: -20°C to +60°C
Temperature: -45°C to +85°C
0% to 95% (noncondensing)
Dimensions in Inches (mm)
Height:
Width:
Depth:
Weight:
10.25 (260.4)
6.72 (170.7)
3.70 (94.0)
7 lbs. (3 kg)
UL Recognized
Log Book:
Log Event:
Log Start:
Start Profile:
100 events
20 trips and alarms
Last 4 starts
Last start
(communication only)
History Records:
Motor, trips, alarms and
permanent records
File Number E154862
UL 1053
ANSI C37.90, C37.90.1, C37.90.2
CSA
Figure 5.2-8. MP-3000 Specifications
For more information visit: www.EatonElectrical.com
CA08104001E
Protective Relays
Motor Protection
January 2005
5.2-9
Sheet 0247
Layout Dimensions — MP-3000
i
6.89 (175.0)
5.33 (135.4)
ii
S/N000000
A980000
66D2029G01
REV. 1
BUILT BY
F.C.
1
TESTED BY
G.K.
2
Unused
+4/20
O
3
Discrete
51 (241.6)
4
66C2020
H01
5
6
7
Outer Chassis
Inner Chassis
Outer Flange
8
Mounting Panel
Figure 5.2-9. MP-3000 Drawout Panel Mounting — Dimensions in Inches (mm)
9
5.23 (132.8)
+4/20 Output 11
12
-4/20 Output
14
13
10
Unused
Discrete Source
Unused
15
11
41
42
URTD Data
URTD Common 43
44
URTD Shield
45
46
47
48
49
50
51
52
53
54
55
56
URTD Strobe
16
12
Discrete In 1
17
VAC 120V or
Auto 240V
19
Select Neut
H1A
H1B
H1C
G1
Unused
66C2020H01
21
18
Discrete In 2
20
22
23
24
25
26
27
28
29
30
Discrete Com
11 12
41 42
13 14
43 44
15 16
45 46
17 18
47 48
19 20
49 50
21 22
51 52
23 24
53 54
25 26
55 56
27 28
57 58
29 30
59 60
Aux 2
H2A
H2B
H2C
G2
Alarm
Poni In
Unused
57
58
59
60
Aux 1
14
Trip
15
Shield
Earth Gnd
66C2020H02
Figure 5.2-10. Rear View of MP-3000 Drawout Outer Case — Dimensions in Inches (mm)
13
16
17
18
19
CA08104001E
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