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1600 V rated 8 SCRs are connected in series. The operation voltage of the string is 4400. Calculate the string efficiency.

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1600 V rated 8 SCRs are connected in series. The operation voltage of the string is 4400. Calculate the string efficiency.

(a) 34.37 %

(b) 30.15 %

(c) 38.48 %

(d) 35.84 %

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I'd like to ask this question from Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives

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The correct choice is (a) 34.37 %

The best I can explain: The string efficiency can be calculated using the formula

operation voltage ÷ (Number of SCRs×Rated voltage) = 4400÷(1600×8) = 34.37 %.

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