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Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 110° and supply frequency is 50 Hz.

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Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 110° and supply frequency is 50 Hz.

(a) 3.8 msec

(b) 5.2 msec

(c) 9.3 msec

(d) 8.7 msec

I got this question in a national level competition.

I'd like to ask this question from Solid State Controlled Drives in portion Introduction to Solid State Controlled Drives of Electric Drives

1 Answer

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Best answer
Correct choice is (a) 3.8 msec

Best explanation: The circuit turn-off time for 3-Φ Fully controlled rectifier is (180°-α)÷ω;. The value of circuit turn-off time for ∝ ≥ 60° is (180°-110°)÷6.28×50=3.8 msec.

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