Question

In 3-Φ Fully controlled rectifier calculate the average value of the voltage if the supply is 400 V and firing angle is 45°.

(a) 381.15 V

(b) 382.16 V

(c) 383.19 V

(d) 384.25 V

This question was addressed to me in class test.

I would like to ask this question from Solid-State Switching Circuits in portion Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

The correct option is (b) 382.16 V

For explanation I would say: In 3-Φ Fully controlled rectifier, the average value of the voltage is   3Vml(cos(∝))÷π=3×400×√2(cos(45°))÷3.14=382.16 V.