How to adjust reactive power in synchronous machine? A) by changing the load applied to the shaft B) by changing the frequency C) by changing the excitation current D) by changing the applied 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.
How to adjust reactive power in synchronous machine?
A) by changing the load applied to the shaft
B) by changing the frequency
C) by changing the excitation current
D) by changing the applied voltage
It is known that a synchronous generator, will deliver reactive power
when (over-excited condition )
And
a synchronous generator will absorb the reactive power
when (under-excited condition )
And excitation of the synchronous machine is controlled by the excitation current .
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