Answer / ahmed mustafa

Transformers have errors arising from both Watt metric and
magnetizing current losses that cause deviation from the
ideal and the interconnection between them may have unequal
impedance, this can give rise to spill current through the
relay even if no fault has been detected.

Answer / max

current in relay in no-fault condition

Answer / tahsinullah

The current which flow in the Over-Current-Relay during fault is called Spill current.

Answer / shaikh

The ratio of primary to secondary current and produces the
spill current in relay.

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