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

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

(a) 73%

(b) 57%

(c) 173%

(d) 157%

I have been asked this question in final exam.

My question comes from Parallel Operation of Single Phase Transformers topic in chapter Transformers of Electrical Machines

1 Answer

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Best answer
The correct option is (a) 73%

The best explanation: Line voltage in the output will be (1.73*V/x), so the additional voltage will be (173-100/100)*100% = 73%.

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