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    Power Systems: Real Value of a Fault Current for 3-Phase Fault

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    Both machines in the attached diagram are rated at 50 MVA, 20 KV. The system base is the machines' base.
    Find the real value of the fault current for a 3-Phase fault at the motor terminals.

    See the attached file.

    © BrainMass Inc. brainmass.com October 9, 2019, 4:17 pm ad1c9bdddf
    https://brainmass.com/engineering/power-engineering/power-systems-real-value-fault-current-phase-fault-27819

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    Solution Preview

    I will indicate the easiest approach to solve this problem, and then will demonstrate that all the "extra" data given are, indeed, consistent.

    We will apply Thevenin equivalent approach to find the real (actual) fault current at the motor terminal.

    The Thevenin Voltage Vth is the voltage at the fault location, that is, Vt,m = 0.9@-14 deg.

    The Thevenin impedance Zth is the impedance is that measured at ...

    Solution Summary

    Solution contains calculation, answers and explanations. It determines the real value of a fault current for 3-phase fault in 360 words.

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