10. A three-phase, Y-connected synchronous generator is rated 120 MVA, 13.8 kV, 0.8 PF lagging and 60 Hz. Its synchronous reactance is 1.3Ω per phase and is armature resistance is 0.1Ω per phase. (a) What is its voltage regulation? (b) What would the voltage and apparent power rating of this generator be if it were operated at 50 Hz with the same armature and field losses as it had at 60 Hz? (c) What would the voltage regulation of the generator be at 50 Hz?
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.
10. A three-phase, Y-connected synchronous generator is rated 120 MVA, 13.8 kV, 0.8 PF lagging and 60 Hz. Its synchronous reactance is 1.3Ω per phase and is armature resistance is 0.1Ω per phase.
(a) What is its voltage regulation?
(b) What would the voltage and apparent power rating of this generator be if it were operated at 50 Hz
with the same armature and field losses as it had at 60 Hz?
(c) What would the voltage regulation of the generator be at 50 Hz?
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