Answered: The efficiency of a 20 kVA 15.4 / 0.4…

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

The efficiency of a 20 kVA 15.4 / 0.4 kV three-phase power transformer is 75.4% for a load with unity power factor at rated power.

Relative short circuit voltage Uk% = 30.0 and relative no-load current% I0 = 30.

Since the transformer (Star-delta) is connected;

Note: In 3-phase electrical machines, the current-voltage information given on the label is always line values. Phase valueWhen given, it must be specified separately. Therefore, all current-voltage information given in the question are line values.

1-) Draw the primary reduced equivalent circuit.

2-) What is the power value measured in the short circuit test of this transformer?

3-) What is the iron loss value of this transformer ?

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