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A 750 A circuit uses thyristor of current rating 175 A. If derating is 25%, the number of thyristors in parallel is
  • a)
    3
  • b)
    4
  • c)
    6
  • d)
    10
Correct answer is option 'C'. Can you explain this answer?
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A 750 A circuit uses thyristor of current rating 175 A. If derating is...
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A 750 A circuit uses thyristor of current rating 175 A. If derating is...
If the thyristor is derated by 25% means it will have capacity of carrying only 75% current . 75% current means 175*0.75 i.e 131.25 amps. as the thyristor are connected in parallel therefore the no of thyristor = total current /current in each thyristor = 750/131.25
i.e 5.71 or approx 6
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