A 3-phase, 4- Pole, star- connected Alternator is rated at 10 KVA, 420V. The armature resistance is negligible and synchronous reactance is 2.2 ohms per phase. Calculate the percentage voltage regulation for a load of 7.5 KVA at 0.707 power factor lagging.

A 3-phase, 4- Pole, star- connected Alternator is rated at 10 KVA, 420V. The armature resistance is negligible and synchronous reactance is 2.2 ohms per phase. Calculate the percentage voltage regulation for a load of 7.5 KVA at 0.707 power factor lagging.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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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

A 3-phase, 4- Pole, star- connected Alternator is
rated at 10 KVA, 420V. The armature resistance is
negligible and synchronous reactance is 2.2 ohms
per phase. Calculate the percentage voltage
regulation for a load of 7.5 KVA at 0.707 power
factor lagging.

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