GE GEK-106273L, Instruction Manual

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RELAY COMMISSIONING
GEK-106273L MIF Digital Feeder Protection 9-9
9.17 DEFINITE TIME
•
Set the relay as follows:
51P Settings Group
Curve DEFINITE TIME
Definite Time Delay 1.0
•
Apply 0.9 times the pickup current into phase A and the relay should not trip.
•
Apply 1.1 times the pickup current and the relay should trip in 1.0 sec. Acceptable time range is between 1.00 and
1.06 sec.
•
Apply 4 times the pickup current and the relay should trip in 1.0 sec. Acceptable time range is between 1.00 and
1.06 sec.
9.18 GROUND TOC UNIT (51N)
Enable 51N function only and set its current pickup value to the minimum possible.
9.18.1. IEC INVERSE CURVE
•
Set the relay as follows:
51N Settings Group
Curve INVERSE
Time Dial
1
•
Apply 0.9 times the pickup current at the ground terminals and the relay should not trip.
•
Apply 1.5 times the pickup current and the relay should trip between 15.3 and 19.7 sec.
•
Apply 5 times the pickup current and the relay should trip between 4.1 and 4.5 sec.
9.18.2. IEC VERY INVERSE CURVE
•
Set the relay as follows:
51N Settings Group
Curve VERY INVERSE
Time Dial 1
•
Apply 0.9 times the pickup current at the ground terminals and the relay should not trip.
•
Apply 1.5 times the pickup current and the relay should trip between 23.4 and 31.8 sec.
•
Apply 5 times the pickup current and the relay should trip between 3.1 and 3.6 sec.