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When we need start the motor by method of star delta
which size (KW or HP)motor should must be operate in Star
Delta Method,

Answers were Sorted based on User's Feedback

When we need start the motor by method of star delta which size (KW or HP)motor should must be oper..

Above 5HP motor are connected in star delta starter

 Is This Answer Correct ? 4 Yes 4 No

When we need start the motor by method of star delta which size (KW or HP)motor should must be oper..

when the start moter in star mode BG the starting torque will be high after that in delta mode.than moter safe.

 Is This Answer Correct ? 1 Yes 1 No

When we need start the motor by method of star delta which size (KW or HP)motor should must be oper..

Above 7.5hp motor start in star&delta connection

 Is This Answer Correct ? 1 Yes 1 No

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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.

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