Answered: A 3-phase, 20 MVA, 10 kV alternator has…

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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A 3-phase, 20 MVA, 10 kV alternator has internal reactance of 5% and negligible resistance. Find the external reactance per phase to be connected in series with the alternator so that steady current on short-circuit does not exceed 8 times the full load current.

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Step 1

We have a 3-phase alternator we have been asked to find the external resistance per phase to be connected in series with the alternator so that steady current on short-circuit does not exceed 8 time the full load current.

Given data,

MVA rating = 20 MVA

Volltage (V) = 10 KV = 10000 V

Internal reactance of 5%.

We will first require the value of full load current and voltage per phase.

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