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A submarine has a 3-phase, Y-connected, 2- pole, 60Hz synchronous generator rated to deliver 1687.5 kVA...

A submarine has a 3-phase, Y-connected, 2- pole, 60Hz synchronous generator rated to deliver 1687.5 kVA at a FP = 0.8 lagging with a line voltage of 450-V. The machine stator resistance RS = 0.004 ?. The synchronous reactance is Xs=0.08 ?. The actual system load on the machine draws 900 kW at FP = 0.6 lagging. Assume that a voltage regulator has automatically adjusted the field current so that the terminal voltage is its rated value. Mechanical losses are 100 kW. Use Van as the voltage reference.

a. Determine the reactive and apparent power delivered by the generator.  

b. Find the current delivered by the generator

c. What is the overall efficiency?

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