M Family Digital Machine Protection Relay
3
Three-phase protection
for electrical machines.
Features and Benefits
Protection and Control
■
Advanced 16-bit microprocessor
■
Thermal image protection
■
Configurable logic, curves, digital I/Os
and LEDs
■
Unbalance
■
Overcurrent and undercurrent
■
Flash memory for field upgrades
■
Monitoring and metering
■
Two settings groups
■
Analog/digital oscillography
■
Drawout case for easy maintenance
■
24 event recording
■
AC/DC power supply
■
Restricted ground fault
■
Access via front panel keypad or communication links
User Interfaces
■
Compatible with M Family systems in
half or full 19" racks
Applications
■
Protection and control for generators,
motors, and transformers
■
enerVista.com compatible (see page 275)
■
M+PC software for setting and monitoring
■
Front RS232 and rear RS485 ports using
ModBus® RTU protocol up to 19,200 bps
GE Multilin
1
MIG M Family Digital Machine Protection Relay
Protection
The MIG Digital Machine Protection
Relay is designed specifically for
small generators and motors. As
part of the M Family, the MIG
provides superior protection which
includes:
3
Thermal Image Unit
The thermal image algorithm
protects the machine from negative sequence components that
can cause overheating in the stator
and rotor, as well as overload.
an additional ground sensor.
Alternatively, for more sensitive
detection, an additional core
balance (zero sequence) ground
sensor encircling the three-phase
conductors can be used.
Undercurrent
Ground IOC Units
Starts/Hour and Time To Restart
This protection has the same
settings and features as the phase
IOC unit.
This feature counts the number of
machine starts during a time
window to ensure they do not
This function is used in motor
applications to detect a decrease
in machine current caused by
load decrease. The unit can be
set as an alarm or trip.
Functional Block Diagrams
Unbalance
52G
Protection against rotor damage
is provided through definite time
or time curve models, to minimize
heating caused by the negative
sequence current generated by
supply voltage unbalance.
GENERATOR APPLICATION
49
46
51P
50P
50G
51G
METERING
OSCILLOGRAPHY
EVENT RECORDING
CONFIGURABLE I/O
CONFIGURABLE LEDS
CONFIGURABLE LOGIC
GEN
Three-Phase TOC
This protection can be set from
0.1 to 2.4 times I n. Four separate
ANSI or IEC TOC curves can be
selected including definite time,
normal inverse, very inverse, and
extremely inverse. Additionally, a
user configurable curve is available. Different time multipliers
may be set for each curve, optimizing curve selection for coordination with fuses, machines,
motors, transformers, or other
equipment.
ANSI
IEC/BS142
normal inverse
very inverse
extremely inverse
definite time
IEC A
IEC B
IEC C
definite time
MIG
Digital Machine Protection
3
Adjustable phase IOC allows the
pickup setpoint to be set from 0.1
to 30 times I n and a time delay
from 0 to 100 seconds.
This feature has the same curve
selection choices and settings as
the phase TOC unit. The ground
signal is normally derived as the
residual sum of the three-phase
CTs eliminating the need for
2
49
46
51P
50P
37
66
50G
51G
METERING
OSCILLOGRAPHY
EVENT RECORDING
CONFIGURABLE I/O
CONFIGURABLE LEDS
CONFIGURABLE LOGIC
MIG
M
Phase IOC Units
Ground TOC
MOTOR APPLICATION
52M
Digital Machine Protection
742751A2.ai
52
TRANSFORMER APPLICATION
49
3
46
51P
METERING
OSCILLOGRAPHY
EVENT RECORDING
CONFIGURABLE I/O
CONFIGURABLE LEDS
CONFIGURABLE LOGIC
50P
1
50G
51G
87R
MIG
742752A2.ai
www.GEindustrial.com/Multilin
MIG M Family Digital Machine Protection Relay
Locked Rotor
The MIG provides protection
during extra-long start-ups where
excessive overcurrent conditions
can damage rotors. This protection
is critical for power applications
where the motor drives the generator into service.
Typical Wiring
Note: Only for reference. For particular connections for any MIG model, please refer to its external
connections drawing.
ZERO SEQUENCE
GROUND SENSING CONNECTION
LINE
A
<<
B
<<
>>
C
<<
>>
>>
20 A MAX
CIRCUIT BREAKER
LOCATED BEFORE
POWER INPUT
ZERO SEQUENCE
GROUND CT
PHASE A
CT
PHASE C
CT
C1 C2 C3 C4 C5 C6 C7 C8
A1
A2
IB N IC N
+/L
-/N
IA
N
IG N
A6
CAUTION: Fork or ring terminals must be used on the
termainal block.
NOTE: Suitable disconnect devices (switch or circuit
breaker) recommended located near the relay.
OVERVOLTAGE CATEGORY: II
(*) Terminals B12, A12 and B11 must be connected to SELV
(safety extra-low voltage) parts (on the PLC). They are
not to be tested for hipot test under any circumstance.
(**) In basic model, inputs and outputs are configured as
follows:
OUTPUTS
INPUTS
OUT1: Phase Trip
CC1: Disable 50P Function
OUT2: Ground Trip
CC2: Disable 50N Function
OUT3: 50 Trip
OUT4: 49 Alarm
GROUND
BUS
Digital Generator
Protection
B5
B6
A8 CC1
A9 CC2
A10 COM
RS232
SAFETY
GND GROUND
DIGITAL OUTPUTS(**)
A5
DIGITAL
INTPUTS(**)
>>
MIG
TRIP
<<
C1 C2 C3 C4 C5 C6 C7 C8
IA
Internally fused
1A/250V fast blow
RS485
52a
TRIP
COIL
READY
Restricted Ground Fault (RGF)
protection provides sensitive
ground fault detection for low
magnitude fault currents that
may not be detected by other
protection functions. This protection is often applied to machines
and transformers having impedance grounded wye windings.
TRIP COIL CONTROL
POWER +
C
N
IB N IC N
IG N
POWER
CURRENT INPUTS
52a
B
PHASE C
CT
NOTE: 14 AWG wiring
recommended (2.5 mm2)
AC or DC
CIRCUIT
BREAKER
A
PHASE B
CT
GE Multilin
Restricted Ground Fault
ALTERNATIVE CT WIRING FOR
RESIDUAL GROUND SENSING
PHASE A
CT
PHASE B
CT
CURRENT INPUTS
SDA B12(*)
A
SDB A12(*)
B
GND B11(*)
GROUND
JX
COM OUT4 OUT3 OUT1/2 OUT1
exceed the number programmed
by the user. If the number is
exceeded, the unit blocks any new
attempts and keeps the trip contact
closed during the restart block time.
B7
INPUT
B8
PROGRAMMABLE
CONTROLLER
B9
B10
A7
INPUT
742750A2.ai
Inputs and Outputs
The factory configuration of MIG
inputs and outputs can be easily
modified using M+PC software.
Two digital inputs and six relay
outputs are provided, four of them
programmable. These configurable outputs can be assigned
either to a set of pre-configured
values, or to an OR/NOT combination of the same values.
Ordering
MIG P * * * E O 00 * 00 *
MIG
P
A
I
1
5
1
5
N
MIG Guideform
Specifications
For an electronic version of the MIG
guideform specifications, please
visit: www.GEindustrial.com/
Multilin/specs, fax your request
to 905-201-2098 or email to
literature.multilin@indsys.ge.com.
F
H
C
S
Digital machine protection relay
Three-phase + ground relay
ANSI curves
IEC curves
Phase CT In = 1A (pickup range: 0.1 – 2.4 A)
Phase CT In = 5A (pickup range: 0.5 – 12 A)
Ground CT In = 1A (pickup range: 0.1 – 2.4 A)
Ground CT In = 5A (pickup range: 0.5 – 12 A)
Sensitive ground CT In = 1 A
(pickup range: 0.005 – 0.12 A)
24 – 48 VDC auxiliary voltage (range: 19 – 58 VDC)
110 – 250 VDC (range: 88 – 300 VDC) and
110 – 230 VAC (range: 88 – 264 VAC)
Individual relay
Mounted in an M+ system†
† If relays are to be mounted in an M+ system, then either an M050 half 19” rack or M100 full 19” rack case must be
ordered. The M050 and M100 racks are provided at no additional cost based on the number of relays ordered.
Accessories
B1315P1 Depth reducing collar, reduces the mounting depth by 63 mm
enerVista enabled
See page 275.
www.enerVista.com
www.GEindustrial.com/Multilin
3
3