Question

From the diode rectifier circuit shown below, with phase sequence R-Y-B, diodes D3 & D5 conduct when

(a) R is the most positive & B is the most negative

(b) R is the most positive & Y is the most negative

(c) R is the most negative & B is the most positive

(d) R is the most negative & Y is the most positive

I have been asked this question in my homework.

This interesting question is from 3P-Diode Rectifiers-2 topic in section Diode Rectifiers of Power Electronics

Answer 1

Correct answer is (b) R is the most positive & Y is the most negative

For explanation I would say: Which diode will conduct depends on where is it in connected? as in in which phase?. D3’s anode is connected to the R phase, hence it will turn on when R is the most positive.