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why middle phase should used for earth fault and other
phases used for over current in overcurrent and earth fault
relay?
- 7 Answers
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Answer / prasun bhaumik
It is a convention there will not be any problem
technically if we change that arrangement
| Is This Answer Correct ? | 7 Yes | 4 No |
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.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / gunasekaran
on that point resiudual current is zero normally current sum
is zero at thatt point whenever balance is distrubed current
will flow
| Is This Answer Correct ? | 2 Yes | 3 No |
Answer / j.dev singh
for balancing of two phases current in relay.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / amrander singh
Please tell the answer Clearly......waiting..
| Is This Answer Correct ? | 0 Yes | 4 No |
Answer / pragnesh patel
This kind of arrangement is use for saving one over current
relay.
| Is This Answer Correct ? | 0 Yes | 4 No |
Answer / vinuram
first and 3rd phases are having voltage and current
flactuation.
| Is This Answer Correct ? | 0 Yes | 7 No |
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