Viewed from the point of fault, a three-phase system tan be represented by an id

Question

Viewed from the point of fault, a three-phase system tan be represented by an ideal three-phase. 13.8 kV (rms) generator, with a series impedance of (0.02 + j 0.43) Ohm/phase. The system is solidly grounded. A fault-to-ground occurs on one phase when the instantaneous voltage is 3.5 kV and declining. Calculate the approximate value of the first and second peaks of the fault current. Calculate approximately the maximum force/meter on the phase and ground buses at a point where they mil parallel, 20 cm apart.

Explanation / Answer

WE know that

If=fault current in 1 branch

IF=VR0 /(ZFF+ZF) as the system is solidly grounded then Zf=0

SO

put the values to get the values of fault current

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