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    neilmcentee's Avatar
    neilmcentee Posts: 1, Reputation: 1
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    #1

    Feb 16, 2011, 03:58 PM
    How many amps at 208 volt to supply a transformer to create 480 volt 150 amp
    Power requirements using a 112.5 kva transformer
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #2

    Feb 16, 2011, 05:07 PM

    The total volt-amps are the same on the primary and secondary. If the secondary is at 480V, 150A, that's a total of 72 kVA.

    Therefore, if the primary is at a voltage of 208V, the current must be 72,000/208 or about 350 Amps.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Feb 17, 2011, 03:47 AM
    I will assume this is 3 phase, in which case the calculation is for example;

    480 Volts x 150 Amps x 1.73 = 124,560 VA
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #4

    Feb 17, 2011, 05:57 AM
    Comment on tkrussell's post
    Good point.
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