FOR WHICH FAULTS OR CONDITIONS DOES A TRANSFORMER
DIFFERENTIAL PROTECTION DOES NOT OPERATE???
Answers were Sorted based on User's Feedback
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.
Is This Answer Correct ? | 4 Yes | 0 No |
Answer / v.selvakumar
through fault or external fault it won't operate.
Is This Answer Correct ? | 2 Yes | 0 No |
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.
Is This Answer Correct ? | 2 Yes | 0 No |
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
Is This Answer Correct ? | 2 Yes | 0 No |
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.
Is This Answer Correct ? | 2 Yes | 1 No |
Answer / siddharth tayade
onely internal fault is detected by the diffrential relay
it will not trip under through fault condition
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / minu
no. i am asking abt the in-zone faults only. for what in-
zone faults or some conditions will it not operate.
Is This Answer Correct ? | 1 Yes | 2 No |
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.
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / minu
does that mean that a shorted turn fualt wont be detected
by any other relay too???
Is This Answer Correct ? | 1 Yes | 2 No |
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