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Calculate the string efficiency if the de-rating factor is .429.

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Calculate the string efficiency if the de-rating factor is .429.

(a) 48.1 %

(b) 57.1 %

(c) 47.8 %

(d) 46.5 %

The question was asked in semester exam.

The above asked question is from Solid-State Switching Circuits in section Introduction to Solid-State Switching Circuits of Electric Drives

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The correct option is (b) 57.1 %

Easiest explanation: The string efficiency is calculated for series and parallel connection of SCRs. The value of string efficiency is 1-(De-rating factor)=1-.429=57.1 %.

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