Chapter 8, Problem 1RQ

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

To determine

The number of transformer required to make an open-delta connection.

Explanation of Solution

Two transformers are required to make an open delta connection.

The below figure represents the open-delta connection.

Figure-(1)

The first transformer is connected between $L_1{L}_2$ and $A_{1}n$ and the second transformer is connected between $L_2{L}_3$ and $A_{2}n$.