Delta/Star

Discussion in 'Homework Help' started by jeffbhoy, Feb 24, 2009.

  1. jeffbhoy

    Thread Starter New Member

    Feb 24, 2009
    1
    0
    Can anyone help with a question i have...

    An unbalanced star connected load has phase impedances of
    Za = 5/30° , Zb = 10/-45° , Zc = 15/60°
    The supply is 3phase 4 wire 440v.

    Calculate

    a) the 3 phase voltages
    b) the 2 line currents

    im getting confused with the conversion and the 30° lagging

    is it?

    Delta
    Vline = Vphase and both in phase
    Iline = √3 x Iphase and lags it by 30°

    Star
    Vline = √3 x Vphase and leads it 30°
    Iline = Iphase and both in phase

    thanks in advance...
     
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