1.

Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 27° and supply frequency is 50 Hz.(a) 11.8 msec(b) 14.4 msec(c) 16.1 msec(d) 16.5 msecThe question was asked during an interview.I'm obligated to ask this question of Solid State Controlled Drives in section Introduction to Solid State Controlled Drives of Electric Drives

Answer»

The correct answer is (a) 11.8 msec

To ELABORATE: 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°-27°)÷6.28×50=11.8 msec.



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