GE GEK-106273L Instruction Manual page 132

RELAY COMMISSIONING
9.11 RELAY METERING
PHASE CURRENT
• Set the relay to the same frequency than the AC source used and apply the following currents:
Phase
Ia (Amps)
Ib (Amps)
Ic (Amps)
• Check that the relay measures Ia, Ib and Ic with an accuracy better than 3%.
• If the test were carried out at 50 Hz, repeat at 60 Hz (if at 60 Hz, repeat at 50 Hz).
GROUND CURRENT
• Set the relay to the same frequency than the AC source used and apply the following current:
• Check that the relay measures the current with an accuracy better than 3%.
• If the test were carried out at 50 Hz, repeat at 60 Hz (if at 60 Hz, repeat at 50 Hz).
9.12 PHASE IOC HIGH SETTING UNIT (50PH)
• Enable only 50PH function.
• Set its time delay and pickup to the minimum possible.
• 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 between 10 to 40 ms.
• The test should be carried out for phases A, B and C.
9.13 PHASE IOC LOW SETTING UNIT (50PL)
• Enable only 50PL function.
• Set its time delay and pickup to the minimum possible.
• 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 between 10 to 40 ms.
• The test should be carried out for phases A, B and C.
GEK-106273L
1
0.5 x In (phase)
0.1 x In (phase)
In (Amps) 0.1 x In (ground)
MIF Digital Feeder Protection
9.11.1.
2 3
1 x In (phase)
1 2
5 x In (ground)
CURRENT METERING
4
2 x In (phase)
9-5