Interested to Buy Any Domain ? << Click Here >> for more details...
Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on
External earth fault REF relay trips along with earth fault
relay.The REF relay has no complant as we tested relay.Why is
it happening?
- 3 Answers
- 6674 Views
- KSEB, I also Faced
- E-Mail Answers
Answer Posted / shariff
REF relay shold not operate otherthan its zone of operation
i.e 11kV REFR zone is from 11kV trf busings to 11kV CT
(incomer) and some times PT also if PT is before CT. It is
a mal function only and it can be any of the following.
1) Check the 11kV NCT wiring it may be loose/ got cut in
the NCT wiring box in the yard.
2) The 11kV incomer CT wiring may be loose/ got cut etc.
3) Check the 11kV PT primary resistance it may notbe equal.
| Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
sir, i'm preparing for hpcl exam officer trainee pls tell me how the exam ques paper pls pls
what is residuel magnetism. and how order lead acid batteries for 24 volt. emergency lighting system.
If Dg set load increase 25%, How much increase fuel Consumption (15 kva 2 cylinder DG set)
What is bode plot?
what is the principle of operation of CFL ??
how to maintain frenquncy with syncronising sub-station for distribution
there is an alternator 480 k.w, 400v,50hz, 4-wire running on load having leakage alternator body earthed current 38 A. is it within acceptable limit? if yes then give reference if no then how to bring within specified limit
what is efficient motors and how it is different from normal induction motors
Define resonant frequency?
What is effect of over voltage and under voltage on ACB
how we can do the insulation on secondary of ct explain and so that tan delta will within limit
How to synchoronize the generator (with gcb,GT) to grid????? ????? from Grid iam getting power (rated 400kv/20kv) through GT and its goes to UAT.,,ST.,, now my generator(rated 20kv ) ready.,, now iam closing my GCB.,, in GT iam suddenly giving 20kv on that Gt.,, what will happend
What do you mean by screen of power cables?
bsec exam syllabus (mis)
What is Instantaneous Earth fault relay,how will work
