UNSYMMETRICAL FAULT CALCULATIONS – PART – 14 – SINGLE LINE TO GROUND FAULT – PROBLEM

PROBLEM

A 25 MVA, 11 kV synchronous generator has Z1= 0.2, Z2 = 0.2 and Z0 = 0.05 p.u. A single line to ground fault occurs on the phase R of the generator. Find the fault current and line to line voltages during the fault condition. Assume that the generator neutral is solidly grounded and the generator is operating at no load and at rated voltage at the occurrence of a fault.