question archive A 3f, 25 kV, 500 MVA, 60 Hz alternator has a synchronous reactance Xs = 1

A 3f, 25 kV, 500 MVA, 60 Hz alternator has a synchronous reactance Xs = 1

Subject:Electrical EngineeringPrice: Bought3

A 3f, 25 kV, 500 MVA, 60 Hz alternator has a synchronous reactance Xs = 1.5 pu. The alternator is connected to an infinite 25 kV bus, through a feeder of reactance 0.25 pu, as shown below. The terminal voltage of the alternator is maintained at 25 kV for any loading, by means of a voltage regulator that adjusts the field current. The alternator is delivering 0.75 pu average power to the bus. (a) Draw the phasor diagram. (b) Determine the current and the power factor of the alternator. (c) Determine the excitation voltage of the alternator.

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