Why do we use center tap transformer that used with portable tools

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WHY TRANSFORMERS ARE RATED IN 11KV 22KV 33KV Instead off 10kv 20kv 30kv

5 Answers  

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how much load 15kva dg set can bear

7 Answers  

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what is meant by rotating magnetic filed

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in railways why we use the power in 10,20 30kv,why not in the multiple of 11kv

2 Answers  

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How to calculate of maximum demand if given 628kw, 785kva, 0.8 p.f.

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List any four conventional sources of energy.

1 Answers  

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How does a clampmeter measures dc current

1 Answers  

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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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WHY THE COLOUR OF TRANSFORMER IS GREY ?

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XYZ

0 Answers   ASD Lab,

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Is it possible to protect 3phase overload and earth fault of the 3phase system using two CT's.

0 Answers  

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