Three-phase, 400 V (line voltage), 60 Hz, 6-pole, star-connected synchronous generator has a synchronous reactance of 1.2 ohms per phase. The armature current of the generator at full load is 64 A at a back power factor of 0.95. This generator has a rotational loss of 2 kW and a core loss of 1.6 kW at full load. The excitation current is adjusted so that the output voltage is 400V (line voltage) when the generator is running at no load. When the generator is loaded with 0.95 back power factor current at full load A) Find the rotating field speed of the generator? B) Find the mechanical speed of the generator? C) What will be the output voltage?
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.
Three-phase, 400 V (line voltage), 60 Hz, 6-pole, star-connected synchronous generator has a synchronous reactance of 1.2 ohms per phase. The armature current of the generator at full load is 64 A at a back power factor of 0.95. This generator has a rotational loss of 2 kW and a core loss of 1.6 kW at full load. The excitation current is adjusted so that the output voltage is 400V (line voltage) when the generator is running at no load. When the generator is loaded with 0.95 back power factor current at full load
A) Find the rotating field speed of the generator?
B) Find the
C) What will be the output voltage?
D) Find the yield?
E) Calculate the voltage regulation?
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