A string of n parallel SCRs carries 72 kA, each SCR being rated at 1 kA. If the string’s derating factor is 0.1, what is n?
Correct answer D. 80
Explanation
String efficiency is 1 − 0.1 = 0.9, so n = 72/(0.9 × 1) = 80 SCRs in parallel.
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