ABB REM 610 Technical Reference Manual page 128

REM 610
128
Motor Protection Relay
Technical Reference Manual
The start value of stage I
5A
× × --------------- -
20% 1650A
2000A
Thus, I > = 16% and the 5A input is used.
0
The operate time of the earth-fault stage is set to 50 ms when the network is solidly
earthed.
If the drive is contactor controlled, refer to section Protecting a contactor controlled
motor.
> is calculated as follows:
0
×
= 16% 5A
1MRS 752263-MUM