Question

A 3-phase bridge converter is given a three-phase supply in the phase sequence R-Y-B. Let the neutral to R phase voltage be Vm sinωt. The first SCR (connected to R phase) is fired at an angle of 15°. What is the maximum value at the output terminals at this instant?

(a) Vm/√2

(b) Vm

(c) 1.5 Vm

(d) 3 Vm

This question was addressed to me in class test.

My doubt is from Three Phase Converters-4 in chapter Converters of Power Electronics

Answer 1

Right answer is (c) 1.5 Vm

The best explanation: In case of a 3 phase bridge converter, the maximum value of voltage at the output terminal is always 1.5 Vm.