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APPENDIX B
APPENDIX B TIME-CURRENT CURVES FOR 51P AND 51N UNITSB.1IEC/BS142 CURVES
For 1 < V <1.05 the unit will show a pickup signal and generate no trip.
≤
For 1.05
V <20.00 trip time will be:
≥
For V
20.00, trip time will be the same as for 20 times the setting:
Where:
Table B–1: GE IEC/BS142 INVERSE TIME CURVE CONSTANTS
CURVE NAME
Extremely inverse
Very inverse
Inverse
D = Time Dial
GEK-106237P
A
IEC Curve C
80
IEC Curve B
13.5
IEC Curve A
0.14
MIFII Digital Feeder Relay
P
Q
2
1
1
1
0.02
1
B.1 IEC/BS142 CURVES
B
K
0
0
0
0
0
0
B-1
B
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