# A 480-V, 250-kVA, 0.8-PF-lagging, two-pole, three-phase, 60-Hz synchronous generator’s prime… 1 answer below »

A 480-V, 250-kVA, 0.8-PF-lagging, two-pole, three-phase, 60-Hz synchronous generator’s prime mover has a no-load speed of 3650 r/min and a full-load speed of 3570 r/min. It is operating in parallel with a 480-V, 250-kVA, 0.85-PF-lagging, four-pole 60-Hz synchronous generator whose prime mover has a noload speed of 1800 r/min and a full-load speed of 1780 r/min. The loads supplied by the two generators consist of 300 kW at 0.8 PF lagging.

(a) Calculate the speed droops of generator 1 and generator 2.

(b) Find the operating frequency of the power system.

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(c) Find the power being supplied by each of the generators in this system. (d) What must the generator’s operators do to adjust the operating frequency to 60 Hz?

(e) If the current line voltage is 460 V, what must the generator’s operators do to correct for the low terminal voltage?