A 3-phase 25kVA, 220V alternator delivers rated kVA at a pf of 0.84. The effective resistance between armature winding terminals is 0.18 ohms. The field takes 9.3A at 115V. If friction and windage loss is 400W and the core loss. is 610W, compute for its efficiency.

A 3-phase 25kVA, 220V alternator delivers rated kVA at a pf of 0.84. The effective resistance between armature winding terminals is 0.18 ohms. The field takes 9.3A at 115V. If friction and windage loss is 400W and the core loss. is 610W, compute for its efficiency.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.41P

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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.

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A 3-phase 25kVA, 220V alternator delivers rated kVA at a pf of 0.84. The
effective resistance between armature winding terminals is 0.18 ohms. The
field takes 9.3A at 115V. If friction and windage loss is 400W and the core loss
is 610W, compute for its efficiency.

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