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A 3 phase transformer has its primary connected in delta and secondary in star. Secondary to primary turns ratio per phase is 5. What would be the secondary voltage for a primary voltage of 400 V?

A 3 phase transformer has its primary connected in delta and secondary in star. Secondary to primary turns ratio per phase is 5. What would be the secondary voltage for a primary voltage of 400 V? Correct Answer 3464 V

Given primary voltage = 400 V

Primary connected in delta, hence phase voltage = line voltage = 400 V

Secondary to primary turns ration per phase = 5

Hence secondary phase voltage = 5 × 400 = 2000

Secondary line voltage = √3 × 2000 = 3464 V

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