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

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KPTCL, I also Faced
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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

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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)

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