there is a power transformer 66/11kV in delta-delta connection has 5 feeder com

there is a power transformer 66/11kV in delta-delta
connection has 5 feeder coming out from the secondary side.
One of the feeder in it normally loaded (loaded than other
feeder)and this feeder usually trips with double OCR causing
the bank transformer to trip. Now if the load of this feeder
is put on other transformer then that no problems occurs on
that transformer or the load. However normally all the
test(IR, PI, short ckt, open ckt,grounding test and other )
has been conducted for this but evertything transformer.....
I am not geting what is the actual problem...

Question Posted / ajit152007

2 Answers
4297 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

there is a power transformer 66/11kV in delta-delta connection has 5 feeder coming out from the sec..

Answer / parin patel

This thing happened dew to %Z of transformer.lesser the %Z current supplied by transformer will be more.
example:- there are two transformer
transformer 1: 66/11 kv,%Z= 5% ,15 kVA
transformer 2: 66/11 kv,%Z= 7%, 15kVA
If load is constant(same), current supplied by transformer 1 at 11 kv is more than current supplied by transformer 2 at 11 kv.

In your case ,you have to check the value of feeder current when it's supplied by two different transformer.in both case it might be different.

Is This Answer Correct ?

0 Yes

0 No

there is a power transformer 66/11kV in delta-delta connection has 5 feeder coming out from the sec..

Answer / k.prakashchandra

More data is required for analysis.If the transformers are
of same capacity and relays are identical ,interchange the
relays of transformer banks and watch.

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

what is the disaddvantages of high power factor

2 Answers

i have flexible wire. size of conductors is 0.190 mm & no.of conductors are 48. then size of wire comes 1.37 sqmm instead of 1.5 sqmm . the what is tolerance for this size.

0 Answers

why we use bare wire in high tension power instead of using insulated wire?

2 Answers

Which test will be more severe for VCB?

0 Answers CPRI, Reliance,

electricity bill multiplication factor 487.20xconsumption=total unit in kwh. what is 487.20 ?

1 Answers Spec International,

what is brushless alternator?

0 Answers

_____hamari_____tumhari____ne dil ki_____utari. _____ne ____ dekha ashe ___ doshti ko lage na hamari.Complete pajal

1 Answers Microfine Industries,

Name a govt approved university which have 100% online engineering course.

0 Answers

How much difference can there be between HT & LT KWH unit consumption at the same load?

1 Answers DLF,

how to calculate capacitor bank value to maintain unity power factor plz xplain with some suitable xample?

4 Answers

how to calculate the neautral earthing conductor size for a 500kva dg set.

2 Answers

Explain what are inter-poles and why they are required in a dc machine.

0 Answers

For more Electrical Engineering Interview Questions Click Here