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For a star-delta three phase transformer, if the transformation ratio is ‘x:1’, then how much percent of output will be?

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For a star-delta three phase transformer, if the transformation ratio is ‘x:1’, then how much percent of output will be?

(a) 73%

(b) 57%

(c) 173%

(d) 157%

The question was asked during an interview for a job.

This is a very interesting question from Parallel Operation of Single Phase Transformers topic in portion Transformers of Electrical Machines

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Right answer is (c) 173%

Explanation: Line voltage in the output will be (V/1.73*x).

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