A three-phase, ac/dc converter is excited by a three-phase source of 480 V (rms and line-to-line). Compute the following:
a. The rms volatge across the load when the triggering angle is 30 degrees
b. The average voltage across the load when the triggering angle is 140 degrees. Keep in mind that the conduction is incomplete when the triggering angle is greater than 140 degrees.