I need to go from 480v. To 208v. Using a stepdown transformer to get 200amps ?

Stratmando · Dec 19, 2011, 05:11 AM

480 X 200 = 96,000 Watts(VA)

I would wait for an answer from TK, Stanforty, or Missouri, or other qualified.

tkrussell · Dec 19, 2011, 06:20 AM

200 Amps x 208 volts x 1.73 = 71.968 KVA

You need a standard size 75 KVA transformer.

Check with your supplier for pricing and what the customer needs are, may need isolation, K rated, Low Temp, etc.

Do need to consider, is the total connected load 200 amps?

Can load a transformer 80% of nameplate rating.

Since your dealing with 480 volts, I assume your an electrician and know all the rules regarding transformers, feeder rating, etc.

soupy909 · Dec 20, 2011, 01:32 AM

Thanks tkrussell

tkrussell · Dec 20, 2011, 06:13 AM

Your welcome, Soupy,but you did not answer my questions about calculated load and your qualifications.

By the way, my calculation includes a shortcut I did not show.

The actual formula is: KVA=I x E x 1.73/1000

Using your values:

KVA = 200 Amps times 208 Volts x 1.73 (assuming 3 phase) and divide by 1000 will result in 71.968 KVA

You can see this and other useful power formulas here:

Useful Formulas

I need to go from 480v. To 208v. Using a stepdown transformer to get 200amps ?

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