Transformer AN vs AF
Transformer AN vs AF
(OP)
Hi Buddy, need your guidance on this:-
For each transformer, there is 2 rating involved , AN and AF. Lets say AN/AF = 2.0/2.5MVA. Shall there be any difference with the transformer with 2.0/3.0MVA?
What is the application difference ?
Is there any rule of thumb indicating the AF rating should be?
Thanks.
For each transformer, there is 2 rating involved , AN and AF. Lets say AN/AF = 2.0/2.5MVA. Shall there be any difference with the transformer with 2.0/3.0MVA?
What is the application difference ?
Is there any rule of thumb indicating the AF rating should be?
Thanks.






RE: Transformer AN vs AF
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Sometimes I only open my mouth to swap feet...
RE: Transformer AN vs AF
Can you share with me more on the AN/AF things?
What is the usage of having Forsed air cooling rating to be 150% of natural cool rating?
Shall there be price difference between a transformer with 50%AF rating compare to a transformer with 20%AF rating only?
When i specify the transformer for purchase, shall the AF rating be stated?If without the AF rating stated,will caused any issue?
Thanks.
RE: Transformer AN vs AF
If you want the transformer to have fans and a forced-cooled rating, you must specify this and pay for it.
Another option is to specify the the transformer be self-cooled but have provisions for addition of fans in the future.
The percentage increase in kVA rating for forced air cooling is largely a function of the transformer size and construction. There is a limit to the increase possible, as mentioned.
For ANSI transformers, this is a standard value - I'm not sure about IEC transformers.
RE: Transformer AN vs AF