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100 V rated 3 SCRs are connected in series. The operation voltage of the string is 200. Calculate the De-rating factor.

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100 V rated 3 SCRs are connected in series. The operation voltage of the string is 200. Calculate the De-rating factor.

(a) .35

(b) .33

(c) .38

(d) .18

This question was posed to me during an internship interview.

My query is from Solid-State Devices in division Introduction to Solid-State Devices of Electric Drives

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Correct option is (b) .33

The explanation: The string efficiency can be calculated using the formula operation voltage÷(Number of SCRs×Rated voltage) = 200÷(100×3) = .66. The De-rating factor value is 1-.66 = .33.

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