Answered: A 2082V, 1500-kVA 0.8-PF-lagging 60-Hz…

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 2082V, 1500-kVA 0.8-PF-lagging 60-Hz two-pole Y-connected synchronous generator has a synchronous reactance of 1.5 Ω and an armature resistance of 0.25 Ω. At 60 Hz, its friction and windage losses are 24 kW, and its core losses are 18 kW. The field circuit has a dc voltage of 200 V, and the maximum 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-1 Assume that the field current of the generator has been adjusted to a value of 5 A. Compute the terminal voltage of this generator be if it is connected to a ∆-connected load with an impedance of 20∠30° Ω ? Sketch the phasor diagram of this generator. Compute is the efficiency of the generator at these conditions? Now assume that another identical ∆-connected load is to be paralleled with the first one. What happens to the phasor diagram for the generator? What is the new terminal voltage after the load has been added? What must be done to restore the terminal voltage to its original value?

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