RMS Symmetrical Fault Current

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In the attached figure, assume the following values: V = 4kV, X = 3 Ohm, R = Ohm, and w = 2(pi)(60) rad/sec. Calculate the following three currents: the rms symmetrical fault current, the rms asymmetrical fault current at the instant the switch closes (assuming maximum dc offset), and the rms asymmetrical fault current 5 cycles after the switch closes (assuming maximum dc offset).

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Solution

V = 4 kV, X = 3 Ohm, R = 1 Ohm, and w = 2(pi)(6) = 377 rad/sec

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