Question

In a 3 phase semiconverter, frequency of the ripple in the output voltage wave may be
1. 3 times the supply frequency, $3f$ for $\alpha <{60}^{\circ }$
2. $3f$ for $\alpha >{60}^{\circ }$
3. $6f$ for $\alpha <{60}^{\circ }$
4. $6f$ for $\alpha >{60}^{\circ }$

from the above, the correct statements are

Answer 1

A three-phase semiconverter has the unique feature of working as a six-pulse converter of $\alpha <{60}^{\circ }$ and as a three-pulse converter for $\alpha \ge {60}^{\circ }$, a careful observation of above figure.