A three-phase, fully-controlled thyristor bridge converter is used as line commutated inverter to feed 50 kW power at 420 V dc to a three-phase, 415V (line), 50 Hz ac mains Consider dc link current to be constant. The RMS Current of the thyristor is (a) 119.05 A (b) 79.37 A (c) 68.73 A (d) 39.68 A

A three-phase, fully-controlled thyristor bridge converter is used as line commutated inverter to feed 50 kW power at 420 V dc to a three-phase, 415V (line), 50 Hz ac mains Consider dc link current to be constant. The RMS Current of the thyristor is (a) 119.05 A (b) 79.37 A (c) 68.73 A (d) 39.68 A

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.32MCQ

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Concept explainers

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

Question

A three-phase, fully-controlled thyristor bridge converter is used as line commutated
inverter to feed 50 kW power at 420 V dc to a three-phase, 415V (line), 50 Hz ac mains.
Consider de link current to be constant. The RMS Current of the thyristor is
(a) 119.05 A
(b) 79.37 A
(c) 68.73 A
(d) 39.68 A

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