GEK-106237P MIFII Digital Feeder Relay 9-21
9 RELAY COMMISSIONING 9.16 GROUND TOC ELEMENT (51G)
9
9.16.5 ANSI VERY INVERSE CURVE
Set the relay as follows:
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.
9.16.6 ANSI EXTREMELY INVERSE CURVE
Set the relay as follows:
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
9.16.7 IAC INVERSE CURVE
Set the relay as follows:
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 10.86 and 12.25 sec.
Apply 5 times the pickup current and the relay should trip between 3.69 and 4.16 sec.
9.16.8 IAC VERY INVERSE CURVE
Set the relay as follows:
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 27.27 and 30.75 sec.
Apply 5 times the pickup current and the relay should trip between 2.50 and 2.82 sec.
51G SETTINGS GROUP
Curve VERY INVERSE
Time Dial 10
51G SETTINGS GROUP
Curve EXTREMELY INVERSE
Time Dial 5
51G SETTINGS GROUP
Curve INVERSE
Time Dial 10
51G SETTINGS GROUP
Curve VERY INVERSE
Time Dial 10