21) Two 3-phase 6.6kV, Star-connected alternators supply a load of 3000kW at 0.8pf lagging. The synchronous impedance per phase of machine A is (0.5 +j10)Q and machine B is (0.4+j12) Q. The excitation of machine A is adjusted so that it delivers 150A at a lagging pf and the governors are set so that the load is shared equally between the machines. Find the line to line voltage of alternator B.

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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.