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Anonymous Poster

Transformer Ratings

02/25/2010 12:42 PM

what should be the minimum MVA rating of generator transformer. generator out put 18 MW,11kv & national grid of 33 kv.
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msamad
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Join Date: Feb 2009
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#1

Re: Transformer Ratings

02/25/2010 4:44 PM

Divide 18 MW by the rated power factor of the generator and select the next available MVA rating. For example, if the generator p.f is 0.8, the minimum required transformer MVA rating is 18MW/0.8 = 22.5 MVA. You can select 25 MVA, 33/11KV transformer in this case.

- MS

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sidhu16
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#2

Re: Transformer Ratings

02/26/2010 5:01 AM

The minm. MVA rating of a generator transformer whose generator rating is 18MW will be,

MVA=18/0.8=22.5, where PF=0.8(assumed)

11/33KV, 22.5 MVA
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