Question

A three-phase bridge inverter is operating in ${180}^{\circ }$ mode of operation, which is shown below. Which of the below given devices are in conducting state from ${120}^{\circ }$ to ${180}^{\circ }$ for RYB, $3-\Phi$ balanced output. If initially thyristors $T_1,$ $T_5$ and $T_6$ are conducting at $\omega t=0$?

Answer 1

In ${180}^{\circ }$ mode of operation.

Each state is maintained for ${60}^{\circ }$ and each thyristor conducts for ${180}^{\circ }$ as positive and ${180}^{\circ }$ as negative group.

For ${120}^{\circ }$ to ${180}^{\circ }$ step, thyristors $T_1,T_{2}and{T}_3$ will conduct.