Answered: and armature resistance of 0.5 Ω. At 60…

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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Question

A 25 MVA, 24.25 kV, 50 Hz, 4 poles, Y- connected synchronous generator has a synchronous reactance of 9 Ω and armature resistance of 0.5 Ω. At 60 Hz, the total mechanical losses are 2 MW. The no-load saturation curve giving the relationship between output phase voltage, Eo and excitation current Ix is shown in the picture. If the excitation is adjusted so that the terminal line voltage remains fixed at 24.25 kV, calculate the following:

(i) Exciting field current required at no-load.

(ii) Required exciting field current for 20 MW of connected load with 0.8 power factor lagging

(iii) Efficiency of the generator at condition (ii)

(iv) Input torque of generator

(v) Explain why this kind of electrical machine commonly used in power generation?

Open-circuit characteristic
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18
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12
10
8
6.
4
2
1
2
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6.
7
8
10
Field current (A)
Open-circuit voltage (kV)

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