(b) A synchronous generator connected with an equivalent cireuit of Figure Q4 is shown as below. Here, the armature resistance is being ignored. The field current is adjusted so that the terminal voltage is 480 V at no load. Develop and sketch the output phase voltage vs. load current characteristics of the generator under these condition as below: - i) 0.8 p.f. lagging load for 10 A, 30 A and 60 A load current ii) 0.8 p.f. leading load for 10 A, 30 A and 60 A load current Based on the characteristics as above, explain the changes of output phase voltage from the generator. Suggest the method to overcome of the instability of output phase voltage as shown? RA IA 0.2 2 j1.0 2 RĘ VF LF Figure Q4: Synchronous generator equivalent circuit

(b) A synchronous generator connected with an equivalent cireuit of Figure Q4 is shown as below. Here, the armature resistance is being ignored. The field current is adjusted so that the terminal voltage is 480 V at no load. Develop and sketch the output phase voltage vs. load current characteristics of the generator under these condition as below: - i) 0.8 p.f. lagging load for 10 A, 30 A and 60 A load current ii) 0.8 p.f. leading load for 10 A, 30 A and 60 A load current Based on the characteristics as above, explain the changes of output phase voltage from the generator. Suggest the method to overcome of the instability of output phase voltage as shown? RA IA 0.2 2 j1.0 2 RĘ VF LF Figure Q4: Synchronous generator equivalent circuit

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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Question

(b)
A synchronous generator connected with an equivalent circuit of Figure Q4 is shown as
below. Here, the armature resistance is being ignored. The field current is adjusted so
that the terminal voltage is 480 V at no load. Develop and sketch the output phase voltage
vs. load current characteristics of the generator under these condition as below: -
i) 0.8 p.f. lagging load for 10 A, 30 A and 60 A load current
ii) 0.8 p.f. leading load for 10 A, 30 A and 60 A load current
Based on the characteristies as above, explain the changes of output phase voltage from
the generator. Suggest the method to overcome of the instability of output phase voltage
as shown?
RA
IA
0.2 2 j1.0 2
RF
VF
LF
Figure Q4: Synchronous generator equivalent circuit

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