We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-statio

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected.
Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT.
My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT.
Please guide me.

Question Posted / gokul

2 Answers
3695 Views
KPTCL, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure..

Answer / k.prakashchandra

Intimate whether PT fails whenever there is an earth fault and which winding fails

Is This Answer Correct ?

0 Yes

0 No

We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure..

Answer / karthikeyan

hai mr.gokul,what kind of failure in pt,please tell me.i will clear this problem..,

regards,
karthikeyan
+919095206722 (whats app)

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

in an electronic tri vector meter when the current and voltage sequence changes ? what is the effect of phase sequence on recording of meter

0 Answers L&T,

we have 2.2kw,Y,3000rpm motor but 6leads found in TB what happen if we connect in delta?

0 Answers

What are the testing to be done before the installation of 1000 KVA Transformer?

3 Answers L&T,

during parallel operation of two ac generator which condition must match before taking both parallel i.e speed /voltage rating /kva/exciation

2 Answers

What is the transformenr turns ratio.

5 Answers

hopkinson's test

5 Answers Bhel, NTPC,

what is the function of commutator in dc motor?

52 Answers Aviation, HP, Raj Construction, TCE, University Exams,

how to calculate no. of earthing pits and their diamensions? no. of lightning arrester rods which are required to protect a building of 35 mtr and we calculate?

5 Answers Dharampal Premchand Limited, FlowMore, Hindustan Zinc, Ispat, Maheshwary Ispat, NDDB, Siemens,

Why cant we connect the motor output to generator and then generator output to motor ?

4 Answers

What is OLTC in transformers and what is its function?

4 Answers

any idea abt REVERSE METERING concept.........?

0 Answers

how many Classification of fire extinguisher

0 Answers Juniper Networks,

For more Electrical Engineering Interview Questions Click Here