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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 msecI 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

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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