60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?
Correct answer: A. 76.3 %
- A. 76.3 %
- B. 91.6 %
- C. 83.3 %
- D. 90.9 %
Explanation
Each of the 6 parallel paths contains 10 series thyristors, giving rated capacity of 12 kV and 6 kA. Switch efficiency is (10 × 5.5)/(12 × 6) × 100 = 76.3%.
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