Answer / thiru

transformer differential protection does not operate when
there is out zone fault.because that time two sides of CT's
sense same current. there is no difference of current.so
the relay does not operate.

Answer / v.selvakumar

through fault or external fault it won't operate.

Answer / zahid ali

Turn to turn fault it won't operate.
in other case if the neutral is grounded grounded through
high impedance or Resisted earth fault it wouldn't be
operate on ground fault.

Answer / zahid ali

because there is no difference in the current at the ends
of a winding with shorted turn: a turn fault would have to
burn through major insulation to ground or another phase
before it could be detected

Answer / minu

not the ground fault, if its settings are kept low enough,
it will operate for ground fault also. i am looking for
some other answer.

Answer / siddharth tayade

onely internal fault is detected by the diffrential relay
it will not trip under through fault condition

Answer / zahid ali

Ground Fault

Answer / minu

no. i am asking abt the in-zone faults only. for what in-
zone faults or some conditions will it not operate.

Answer / minu

hi zahid, thanks for the reply. can u pl elaborate a bit on
why it wont operate on turn to turn faults or for other
cases that u mentioned.

Answer / minu

does that mean that a shorted turn fualt wont be detected
by any other relay too???

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