Answered: A three-phase alternator has three…

A three-phase alternator has three armature coils, each rated at 1200 V and 120 A. What is the most nearly the KVA rating of this unit? A. 430KVA C. 520KVA D. 540KVA B. 440KVA

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter7: Alternating Current, Power Distribution, And Voltage Systems

Section: Chapter Questions

Problem 8RQ

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Concept explainers

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.

Question

1. A three-phase alternator has three armature coils, each rated at 1200 V and 120 A. What is the most nearly the KVA rating
of this unit?
A. 430KVA
B. 440KVA
C. 520KVA
D. 540KVA

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