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nambiathiri
Active Contributor

Join Date: Jan 2008
Posts: 18

Transformer selection

03/16/2008 10:33 PM

Transformer selection

in our firm there is a 250hp sqirrel cage induction motor, 3phase, 415 v line to line. star delta starter is employed, When this motor is started there shall be a other loads of 50hp induction motors. What shall be the minimum rating of 11kV/433V transformer
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chaterpilar
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Join Date: Aug 2007
Location: Bhopal India
Posts: 234
Good Answers: 5
#1

Re: Transformer selection

03/16/2008 11:55 PM

If only 250hp is connected to this transformer then 750 kva transformer would do.

But if you buy a soft starter (instead of Y-D starter) then the size of transformer can be 500 kva.

Cheers.

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nesubra
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Join Date: Nov 2006
Posts: 729
Good Answers: 2
#2

Re: Transformer selection

03/17/2008 7:15 AM

is the driven equipment a Pump? what is it?I also feel star delta is not the best for this size of motor though not uncommon

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