ABB 7
Motor Protection
REM615 ANSI
Product Version 2.0
1MAC251744 -PG Rev. A
Issued: 03.01.2010
4. Application
The REM615 relay constitutes main protection
for asynchronous motors and the associated drives.
Typically, the motor relay is used with circuit-breaker or
contactor-controlled distribution motors and contactor-
controlled medium sized and large low voltage motors in
a variety of drives such as pumps and conveyors, crushers
and choppers, mixers and agitators, fans and aerators.
e motor relay is thoroughly adapted for ground fault
protection. Using cable current transformers, sensitive
and reliable ground fault protection can be achieved.
e ground fault protection can also utilize phase current
transformers with a residual connection for the ground
ct input. In this case, possible unwanted operations of
the ground fault protection at motor start-up can be
prevented using the relay’s internal interlocking features
or suitable stabilizing circuits. Figures 3 and 4 show
typical REM615 application in substations with motor
protection requirements.
More comprehensive protection of medium sized motors
is possible with the VT inputs options. Voltage, power
and energy metering and phase, sequence and ground
voltage protection are available with these additional
voltage inputs.
Figure 3. Protection and control application using the
REM615 confi guration A
Figure 4. Protection and control application using the REM615
confi guration C
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IEC 61850
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REM
615
REM
615
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615
REF
615
M1 Mn
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52
REM
615
REM
615
REF
615
REF
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IEC 61850
M1 Mn
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