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    pramodkpandey's Avatar
    pramodkpandey Posts: 12, Reputation: 1
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    #1

    Apr 2, 2007, 01:58 AM
    Transformer rating
    Why is transformer rating given in kva?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Apr 2, 2007, 02:36 AM
    KVA is AC power, so a certain size transformer can only handle a certain amount of power.
    pramodkpandey's Avatar
    pramodkpandey Posts: 12, Reputation: 1
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    #3

    Apr 2, 2007, 07:21 AM
    Hi buddy,but I think the answer is related to power factor.as KW is given as VI because o and KVA as VI only.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Apr 3, 2007, 01:33 PM
    VA is AC power, which takes PF into account. That is why watts is volts x amps x PF.

    If a xfer is rated in watts, it will be only for resistive load with a PF of 1.0 or unity. A xfer rated in VA can provide ac power, with a certain component of lagging PF allowed.

    A xfer could handle an increased amount of power relative to the leading PF up to Unity with a purely resistive load, this adds a safety margin when used with the everyday inductive characteristics with typical AC loads.
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