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• 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 27 and 39 sec.
• Apply 5 times the pickup current and the relay should trip between 1.5 and 1.85 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 36.2 and 51.3 sec.
• Apply 5 times the pickup current and the relay should trip between 3.88 and 4.27 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 26.72 and 37.27 sec.
• Apply 5 times the pickup current and the relay should trip between 2.46 and 2.75 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 17.19 and 23.58 sec.
• Apply 5 times the pickup current and the relay should trip between 1.14 and 1.34 sec
9-10
RELAY COMMISSIONING
9.18.3.
EXTREMELY INVERSE
0.5
INVERSE
10
VERY INVERSE
10
9.18.6.
EXTREMELY INVERSE
5
MIF Digital Feeder Protection
IEC EXTREMELY INVERSE CURVE
9.18.4.
ANSI INVERSE CURVE
9.18.5.
ANSI VERY INVERSE CURVE
ANSI EXTREMELY INVERSE CURVE
GEK-106273L
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