Answer / prasun bhaumik

It is a convention there will not be any problem
technically if we change that arrangement

Answer / vishal ingle

Not necessary to use only the middle phase.
our Back up protection cosist of two overcurrent elements
and one earth fault element.
under normal condition vector (IR + IY + IB) = 0
in fact middle phase is not used for earth fault prot.
Earth fault relay is connected between the star point of
all three phases (after O/C Relay) and the earth. if any
unbalance occurs, the unbalance current will flow through
the e/f relay.

Answer / gunasekaran

on that point resiudual current is zero normally current sum
is zero at thatt point whenever balance is distrubed current
will flow

Answer / j.dev singh

for balancing of two phases current in relay.

Answer / amrander singh

Please tell the answer Clearly......waiting..

Answer / pragnesh patel

This kind of arrangement is use for saving one over current
relay.

Answer / vinuram

first and 3rd phases are having voltage and current
flactuation.

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