Question

8) A three-phase thyristor controlled converter is used to drive a motor system. What is the required trigger delay angle a if the required average output DC voltage is 0.5Vm [2 points) a) 90 degrees. b) 45 degrees. c) 58.43 degrees. d) O degrees.

Answer 1

Vy Vo Three-phove thynistor contolled converter Bulpit average voltage in thoe-phase thyristor conerter is given by, Vo = 34 Cosd d> trigger dday angle %3D liven, V. = 0:5Vm . 3Vm Cosd = O.5 Vm Cosd = 0.5xT 58.43° 58.43° Hence option (e) is correct

When the motor is energised, the pointer is moved to stud 1 such that the whole or maximum resistances is connected at full speed - starter circuit nees blocks the curent to the moter at full speed and motor cursent never exceeds sated current, heuce option (), C) & f) are wong Mence option (a) is comsect, the soft iron piece (pointer) with maximum maes acroes the sesistance netuosk ending up pesistance at full load motor speced.

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