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bharat205
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Join Date: Mar 2010
Posts: 1

The Three States of Cooling

03/01/2010 11:55 PM

272/222/166 MVA Transformer, ONAN/ONAF/OFAF cooling, what exactly this 3 stages of cooling refers to,

And in the nameplate details Z=14% mentioned on OFAF, is there any relation b/w %Z and type of cooling
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Anonymous Poster
#1

Re: ONAN/ONAF/OFAF please explanin what is this 3 stages of cooling

03/02/2010 12:40 AM

1. Please check previous threads, this has been discussed in detail, Here, and a couple of other places too.

2. Yes and No. The type of cooling increases the transformer's MVA rating. It is explained in simple form here,

3. Before asking use the search box on right. Most of the questions are answered more than once in this forum.
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Anonymous Poster
#2
In reply to #1

Re: ONAN/ONAF/OFAF please explanin what is this 3 stages of cooling

03/02/2010 1:07 AM

BTW the three MVA ratings are for three type of coolings and the and the %Z is for OFAF (it will be different for other coolings)
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