Answered: A 480-V 200-kVA…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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. A 480-V 200-kVA 0.8-power-factor-lagging 60-Hz two-pole Y-connected synchronous generator has a
synchronous reactance of 0.25 Ω and an armature resistance of 0.03 Ω. At 60 Hz, its friction and windage
losses are 6 kW, and its core losses are 4 kW. The field circuit has a dc voltage of 200 V, and the
maximum IF is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 200 Ω.
The OCC of this generator is shown in Figure P5-1.
(a) How much field current is required to make VT equal to 480 V when the generator is running at no
load?
(b) What is the internal generated voltage of this machine at rated conditions?
(c) How much field current is required to make VT equal to 480 V when the generator is running at rated
conditions?
(d) How much power and torque must the generator’s prime mover be capable of supplying?

Open-circuit terminal voltage, V
600
480
360
240
120
0
0.0
1.0
2.0
3.0
4.0
5.0
Field current, A
6.0
7.0
8.0
9.0
10.0

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