Question

The commutation period when both incoming and outgoing SCRs are conducting due to source inductance is called as the

(a) conduction delay

(b) overlap period

(c) one on one period

(d) distorting angle

The question was asked during an online interview.

Asked question is from Advance Three Phase Converters in chapter Converters of Power Electronics

Answer 1

Right answer is (b) overlap period

To explain I would say: Due to source inductance, SCRs cannot start and stop conducting immediately, hence a time occurs when both incoming and outgoing SCRs are conducting together. This delay is called as commutation angle or overlap period (μ).