A 6,600V, 1,200 kVA, 3-phase alternator is delivering full load at 0.80 power factor lagging. Its reactance is 25% and resistance is negligible. By changing its excitation, the emf is increased by 30%. At this load, determine the new current and power factor. Draw the single line diagram.
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 6,600V, 1,200 kVA, 3-phase alternator is delivering full load at 0.80 power factor lagging. Its reactance is 25% and resistance is negligible. By changing its excitation, the emf is increased by 30%. At this load, determine the new current and power factor. Draw the single line diagram.
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