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    dinny shinny's Avatar
    dinny shinny Posts: 7, Reputation: 1
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    #1

    Oct 21, 2009, 12:16 PM
    What r the uses of capacitor bank
    How is the voltage profile increased by using capacitor bank..
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Oct 21, 2009, 12:22 PM

    It's not. The phase relationship between voltage and current is.
    dinny shinny's Avatar
    dinny shinny Posts: 7, Reputation: 1
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    #3

    Oct 21, 2009, 05:54 PM
    Quote Originally Posted by KeepItSimpleStupid View Post
    It's not. The phase relationship between voltage and current is.
    Can u explain it in clear...
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #4

    Oct 21, 2009, 06:05 PM

    Voltage is delivered as say 120 V, 60 Hz, so that never changes, capacitor or no capacitor, the utility will adjust so voltage is constant.

    Power is equal to V * I * cos (theta) when the current is sinusoidal and the voltage is sinusoidal. Theta is the phase angle between voltage and current and is 1 for resistive loads.

    AC inductor circuits : REACTANCE AND IMPEDANCE -- INDUCTIVE

    Current lags voltage by 90 deg in a pure inductor.

    Current leads voltage by 90 deg for a pure capacitor.

    By automagicly adding capacitors, you can force the phase angle to be close to zero. Power factor = 1, cos(0deg) = 1

    Commercial customers typically get charged a premium when their power factor is low because the utilities transmission lines have to be bigger.
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