Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 28, Problem 1RQ

How many transformers are needed to make an open-delta connection?

Expert Solution & Answer
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To determine

The number of transformers needed to make an open delta connection.

Answer to Problem 1RQ

Two transformers are needed to make an open delta connection.

Explanation of Solution

Delmar's Standard Textbook Of Electricity, Chapter 28, Problem 1RQ

The open delta connection is used when the amount of three-phase power needed is not excessive. From the figure it can be seen that the open-delta transformer connection can be made with only two transformers. The total output power is 86.6% of the sum of the power rating of the two transformers when an open-delta connection is used.

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