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    clsmooth's Avatar
    clsmooth Posts: 3, Reputation: 1
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    #1

    Nov 8, 2009, 07:20 PM
    Three-phase transformers formulas.
    I have two three phase rnasformers connected by a transmission line. I know transmission-line impedance is j100 ohms, and the load impedance is 4+j1 ohms. I need to find the generator current, the transmission-line current, the load current, the load voltage, and the power delivered to the load.

    I do not know the formulas I need to use to calculate each of the previously stated currents and power.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Nov 9, 2009, 06:46 PM

    Been a while, but I think you can assume that:

    1. transmission line Z is a lumped Z
    2. Generator output is Vs @ 0 deg is going to be a complex voltage source

    You have a series circuit consisting of 100J and 1J

    I think you do Kirkcoff's law assuming a complex voltage source.
    and a complex current.

    e.g. Vs @ x deg = (4+101j)*I at y deg

    Since Vs is the reference, assume 0.

    Power is V*I * cos theta

    It's been a while. Like 35 yrs.

    SO, find V @ 0 deg and find I t theta deg and do the math with the parts.

    Homework, I'm sure.
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