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    soupy909's Avatar
    soupy909 Posts: 2, Reputation: 1
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    #1

    Dec 19, 2011, 03:45 AM
    I need to go from 480v. To 208v. Using a stepdown transformer to get 200amps ?
    I need to get from 480 to 208 and need 200amps what size transformer do I need?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Dec 19, 2011, 06:11 AM
    480 X 200 = 96,000 Watts(VA)

    I would wait for an answer from TK, Stanforty, or Missouri, or other qualified.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Dec 19, 2011, 07:20 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 you're an electrician and know all the rules regarding transformers, feeder rating, etc.
    soupy909's Avatar
    soupy909 Posts: 2, Reputation: 1
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    #4

    Dec 20, 2011, 02:32 AM
    Thanks tkrussell
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #5

    Dec 20, 2011, 07:13 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
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