GUID-12D3399C-F58F-441D-A795-A71F71910B19 V2 EN
Figure 3. Protection function overview of standard configuration C
4. Application
REM615 constitutes main protection for
asynchronous motors and the associated
drives. Typically, the motor IED is used with
circuit-breaker or contactor controlled HV
motors, and contactor controlled medium
sized and large LV motors in a variety of
drives, such as pumps and conveyors,
crushers and choppers, mixers and agitators,
fans and aerators.
The motor IED is thoroughly adapted for earth-
fault protection. Using cable current
transformers sensitive and reliable earth-fault
protection can be achieved. Phase current
transformers in Holmgreen (summation)
connection can also be used for earth-fault
protection. In that case possible unwanted
operations of the earth-fault protection at
motor start-up due to CT saturation can be
prevented using the IED's internal
interlocking features or a suitable stabilizing
resistor in the common neutral return.
The optional RTD/mA module offered for
standard configurations A and B facilitates
the measurement of up to eight analog
signals via the six RTD inputs or the two mA
inputs using transducers. The RTD and mA
inputs can be used for temperature
monitoring of motor bearings and stator
windings, thus expanding the functionality of
the thermal overload protection and
preventing premature aging of the motor.
Motor Protection and Control 1MRS756890 D
REM615
Product version: 3.0 Issued: 2010-06-29
ABB 9
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