Question

In 3-Φ Semi-controlled rectifier calculate the average value of the voltage if the supply is 299 V and firing angle is 56.15°.

(a) 311.26 V

(b) 304.26 V

(c) 314.51 V

(d) 312.45 V

I had been asked this question in quiz.

This is a very interesting question from Solid-State Switching Circuits topic in portion Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

Right answer is (c) 314.51 V

Explanation: In 3-Φ Semi-controlled rectifier, the average value of the voltage is 3Vml(1+cos(∝))÷2π=3×299×√2(1+cos(56.15°))÷6.28=314.51 V.