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20 V rated 8 SCRs are connected in series. The operation voltage of the string is 50. Calculate the De-rating factor.

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20 V rated 8 SCRs are connected in series. The operation voltage of the string is 50. Calculate the De-rating factor.

(a) .67

(b) .68

(c) .69

(d) .70

The question was posed to me in an interview.

My question is taken from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives

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Right option is (b) .68

Easy explanation: The string efficiency can be calculated using the formula operation voltage÷(Number of SCRs×Rated voltage)=50÷(20×8)=.31. The De-rating factor value is 1-.31=.68.

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