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) .18This 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

100 V rated 3 SCRs are connected in series. The operation voltage of t

1.	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) .18This 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
Answer» 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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