railway RRB JE (CBT I + CBT II) Mock Test 2024 Power Systems Protective Relays Differential Relays

In a biased differential relay, the bias is defined as a ratio of -

1
Number of turns of restraining and operating coil
2
Operating coil current and restraining coil current
3
Fault current and restraining coil current
4
Fault current and operating coil current
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