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Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 13° and supply frequency is 49.5 Hz.

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Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 13° and supply frequency is 49.5 Hz.

(a) 730.2 msec

(b) 740.8 msec

(c) 754.5 msec

(d) 755.1 msec

This question was addressed to me in my homework.

I want to ask this question from Solid-State Switching Circuits in chapter Introduction to Solid-State Switching Circuits of Electric Drives

1 Answer

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Right option is (a) 730.2 msec

For explanation: The circuit turn-off time for 3-Φ Fully controlled rectifier is (240°-α)÷ω. The value of circuit turn-off time for ∝ < 60° is (240°-13°)÷6.28×49.5=730.2 msec.

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