Transformer KVA calculation

Thread Starter

hurtman

Joined Aug 6, 2009
1
I've got a three phase generator rated at 70 kva. It's output is going to 3 single phase step up transformers. Each single phase transformer is rated at 22 kva. Would I be exceeding the rating of the transformers if the generator was above 66 kva (3 22 kva transformers)? Or since the three single phase transformers are being used for three phase do you get to multiply the single phase kva rating by the square root of 3 to get a higher kva rating?

Thanks in advance for the help.

Jeff
 

mik3

Joined Feb 4, 2008
4,843
It doesn't matter if the generator can provide more than 70 KVA. The thing that matters is the power drawn from each transformer. This power must be equal or less than 22 KVA in your case.
 
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