Ground Toc Element (51G); Iec Inverse Curve; Iec Very Inverse Curve - GE MIFII GEK-106237P Instruction Manual

Digital feeder protection with recloser
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9 RELAY COMMISSIONING

9.16GROUND TOC ELEMENT (51G)

Enable 51G element only and set its current pickup value to the minimum possible.
Set the relay as follows:
51G 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:
51G 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-106237P
MOD INVERSE
1
VERY INVERSE
1
MIFII Digital Feeder Relay
9.16 GROUND TOC ELEMENT (51G)

9.16.1 IEC INVERSE CURVE

9.16.2 IEC VERY INVERSE CURVE

9
9-19

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