A 3Ø, 2000KW, 480V ∆-connected alternator is short-circuited and is operated at rated speed to produce rated current at 4A excitation. With the short-circuit remove and with the excitation adjusted to 5A, the voltage between stator terminal is 330V. The effective resistance between terminal as measured with dc is 2Ω. Determine the %V.R. of the alternator at half-load and pf of 0.8 leading without changing any given values.
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 3Ø, 2000KW, 480V ∆-connected alternator is short-circuited and is operated at rated
speed to produce rated current at 4A excitation. With the short-circuit remove and
with the excitation adjusted to 5A, the voltage between stator terminal is 330V. The
effective resistance between terminal as measured with dc is 2Ω. Determine the %V.R.
of the alternator at half-load and pf of 0.8 leading without changing any given values.
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