Answer / kiran h mehta

The trip circuit supervision relay is used to monitor
tripping circuit healthyness.It confirms that the breaker
will trip in case of fault on the operation of relay on it.
The circuit is wired through resister and a tripping coil .
Shortly is called as TCSR.It has three coils in it one of
it is flag relay and if trip coil opens , flag indicate
unhealthyness of the tripping circuit.

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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.

2 Answers   KPTCL,

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