Determine the efficiency of a 1500kVA, 2300-V, 3-phase, Wye connected alternator, which operates at a rated output, with a power factor of 80%, The DC armature resistance at 0.08-ohm. The field takes a 70-Aat 120-V from the exciter equipment. Friction and windage losses are 35-kW, iron losses is 15-kW and stray power losses is 1.2-kW. The effective armature winding resistance is 1.8 times the DC value.

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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.