Answer / k.prakashchandra

REF relay does not act as the unbalanced current is equal to
NCT current in all respects. And for diff relay, it also
does not act as the corresponding ct currents in HT and
sides for each phase are equal.If there is current in only
one phase ,EFR will trip as current's return path is through
the EFR.But why there is current in the single good phase as
all dist Trs are delta/ star connected ? May be due to star
connected line capacitors or dist trs/loads are also star
connected with neutrals earthed.

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