A 480-V, 200-kW two-pole three-phase 50-Hz synchronous generator’s prime mover has no-load speed of 3040 r/min and a full-load speed of 2975 r/min. It is operating in parallel with a 480-V 150-kW four- pole 50-Hz synchronous generator whose prime mover has a no-load speed of 1500 r/min and a full-load speed of 1485 r/min. The loads supplied by the two generators consist of 200 kW at 0.85 pf lagging. A. Calculate the speed droops of generator 1 and generator 2. B. Find the operating frequency of the power system. C. Find the power being supplied by each of the generators in this system.
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
A 480-V, 200-kW two-pole three-phase 50-Hz synchronous generator’s prime mover has no-load speed of 3040
r/min and a full-load speed of 2975 r/min. It is operating in parallel with a 480-V 150-kW four- pole 50-Hz
synchronous generator whose prime mover has a no-load speed of 1500 r/min and a full-load speed of 1485
r/min. The loads supplied by the two generators consist of 200 kW at 0.85 pf lagging.
A. Calculate the speed droops of generator 1 and generator 2.
B. Find the operating frequency of the power system.
C. Find the power being supplied by each of the generators in this system.
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