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Two parallel connect SCRs have same voltage drop (Vt) having rated current = 2I1. SCR-1 carries a current of I1=2.6 A whereas SCR-2 carries a current of I2=1.4 A. Find the string efficiency.

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Two parallel connect SCRs have same voltage drop (Vt) having rated current = 2I1. SCR-1 carries a current of I1=2.6 A whereas SCR-2 carries a current of I2=1.4 A. Find the string efficiency.

(a) 45 %

(b) 77 %

(c) 92 %

(d) 84 %

I had been asked this question in a national level competition.

This intriguing question comes from Interconnecting Thyristors topic in portion Power Electronics Devices of Power Electronics

1 Answer

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by (45.1k points)
The correct choice is (b) 77 %

Explanation: The total current would be I1+I2 & rated current is 2I1

String efficiency = (I1+I2)/2I1.

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