Question

Calculate the Vo(avg) for the 3-Φ phase Half-wave controlled rectifier if the supply value is 480 V and the value of firing angle is 92°.

(a) 264.02 V

(b) 487.26 V

(c) 858.26 V

(d) 248.25 V

The question was asked in final exam.

My doubt is from Solid-State Switching Circuits topic in division Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

The correct option is (a) 264.02 V

For explanation I would say: The Vo(r.m.s) for the 3-Φ phase Half-wave controlled rectifier is 3Vm(1+cos(α))÷2π. The value of output voltage is 3Vm(1+cos(α+30))÷2π=3×480×√3×√2(1+cos(92))÷2π=264.02 V.