Electrical Transformers and Rotating Machines
Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781337264419
Author: Stephen L. Herman
Publisher: Cengage Learning US
Question
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Chapter 10, Problem 1RQ
To determine

The short circuit current.

Expert Solution & Answer
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Explanation of Solution

Given:

The secondary voltage (V) is 240V.

The rating of the transformer (VA) is 15kVA.

The impedance (Z) is 4.2%.

Calculation:

Calculate the full load current (I) using the relation.

  I=VAV=(15kVA)(1000VA1kVA)240V=62.5A

Calculate the short circuit current (Isc) using the relation.

  Isc=IZ=62.5A0.042=1488.095A

Thus, the short circuit current in the circuit is 1488.095A_.

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