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ehtkhaDepartment of Electrical Engineering
EENG 4310-Electric Power systems
Symmetrical faults
A simple power system consists of a synchronous generator feeding a synchronous motor through a transmission line. The generator and motor are rated 30MVA, 13.2KV and both have sub transient reactance of 0.2pu. The line connecting them has a reactance of 0.1p.u on the base of the machine ratings. The motor is drawing 20-MW at 0.8PF leading and a terminal voltage of 12.8-kV when a symmetrical 3-phase fault occurs at the motor terminals. Find the sub-transient currents in the generator, the motor and the fault by using the internal machine voltages and by using the Thevenin equivalent circuit.
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