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RELAY COMMISSIONING
9.17
DEFINITE TIME
• Set the relay as follows:
51P Settings Group
Curve
Definite Time Delay
• 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.
• Set the relay as follows:
51N Settings Group
Curve
Time Dial
• 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.
• Set the relay as follows:
51N Settings Group
Curve
Time Dial
• 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.
GEK-106273L
DEFINITE TIME
1.0
INVERSE
1
VERY INVERSE
1
MIF Digital Feeder Protection
9.18.1.
IEC INVERSE CURVE
9.18.2.
IEC VERY INVERSE CURVE
9-9
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