A 1000 kVA, 6.6kV, 3-phase, star-connected alternator has a field resistance of 0.50 ohm per phase and an armature resistance of 0.05 ohm per phase. The field current at full load at 0.85 pf lagging is 200A. The stray power loss is 84kW. Calculate the efficiency at full load 0.90 pf lagging.

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Q: Your company is to supply a 50 Hz alternator to a European company. The stator is wye connected with…

A: Given:- f=50 Hzϕ=0.173 weberT=28 turns

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A: f=60HzT=24 turnsϕ=0.103 weber

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.