2MVA, 2.3kV 3Ø Y-connected alternator operates at rated kVA at a power factor of 80%. The DC armature winding resistance between terminals is 0.08Ω. The field takes 70A at 125V from an exciter equipment. Friction and windage loss is 20kW, iron losses 36kW and stray load losses are 2kW. Calculate the efficiency of the alternator. Assume the effective armature winding resistance is 120% of the DC resistance

Q: In a three-phase star connected alternator it is necessary to generate 7200 line voltage at…

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Q: v. With reference to an 50 Hz3 phase alternator explain how P,Q,V and F are controlled.

A: It is asked to explain the control of P (active power),Q (reactive power), V (voltage) and F…

Q: An Armature runs at 250 r.p.m. and generates an e.m.f. at 50 Hz. There are 216 slots each…

A: The information provided in question are:

Q: A 2 MVA, 2.3-kV three-phase Y-connected alternator operates at rated kVA at a  power factor of 80%.…

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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.