Answer / s.patel

There is no condition like that ,we can connect earth fault relay to any one of the R,Y&B phases ..

Answer / k.prakashchandra

Earth fault relay is not connected any phase.The balancing
current is made to pass through this relay.In two EFR and
one EFR protection scheme,OCR s are usually provided on R
and B phases ,which makes one assume that the EFR is
provided on Y phase.You can have 3 OCR and 1 EFR protection
scheme also

Answer / k.prakashchandra

It may be noted that EFR is connected between the star
points formed by S1s and S2s of CT secondaries.

Answer / k.prakashchandra

In my answer No.2 pl read as 2OCR and 1 EFR

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