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 Post subject: Calculations for 208v SystemPosted: Thu Jul 22, 2010 5:24 am
 Sparks Level

Joined: Tue May 18, 2010 7:03 am
Posts: 53
I have read about the exemption for <240V and <125kva transformer. Also have read about the accuracy of each calculation method for different voltage levels. I have come across a situation where the transformer is 225kva, 12kv to 208v for a small pumping station. Which calculation method is most accurate for this? Turns out the 225 kva transformer is large because it feeds a variety of other loads in addition to the substation. The utility has given me a transformer fault current of 28,400A for the secondary side.

Typically the transformers are fairly small, dedicated to the load and the secondary voltage higher.

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 Post subject: Posted: Thu Jul 22, 2010 6:10 am
 Arc Level

Joined: Mon Jan 18, 2010 11:35 am
Posts: 554
Location: Wisconsin
We use the 'standard' IEEE 1584 calculations for 208V systems.

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