8-12
MIB High Impedance Bus Differntial Relay
GEK-106426B
8.12 DIFFERENTIAL UNIT LEVEL 1 (F87 1)
8 RELAY COMMISSIONING
8
8.12DIFFERENTIAL UNIT LEVEL 1 (F87 1)
Enable only 87 1 function.
Set its time delay and pickup to 0.1 A
With 0.9 times the pickup current the relay should not trip.
With 1.1 times the pickup current the relay should trip in between 10 to 50 ms.
With 4 times the pickup current the relay should trip in less than 15 ms.
The test should be carried out for phases A, B and C.