A three-phase star-connected alternator working at 1800 KVA,50 Hz,2200 V, has an armature dc resistance of 0.12 Q. Assume the ac resistance is 1.5 times the dc resistance. A field current of 75 A produces a short circuit current of 370 A and for the same field current the open circuit voltage is 1200 V. Determine a} Synchronous reactance of the machine b) Full load regulation at 0.9 leading c) Power angle a) b) c)

A three-phase star-connected alternator working at 1800 KVA,50 Hz,2200 V, has an armature dc resistance of 0.12 Q. Assume the ac resistance is 1.5 times the dc resistance. A field current of 75 A produces a short circuit current of 370 A and for the same field current the open circuit voltage is 1200 V. Determine a} Synchronous reactance of the machine b) Full load regulation at 0.9 leading c) Power angle a) b) c)

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 three-phase star-connected alternator working at 1800 KVA,50 Hz,2200 V, has an armature dc resistance of
0.12 Q. Assume the ac resistance is 1.5 times the dc resistance. A field current of 75 A produces a short circuit
current of 370 A and for the same field current the open circuit voltage is 1200 V. Determine
a} Synchronous reactance of the machine
b) Full load regulation at 0.9 leading
c) Power angle
a)
b)
c)

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