A Three-phase half-controlled thyristor bridge with 400 V, three-phase,50 Hz supply is feeding a separately-excited d.c. motor. Armatureresistance is 0.2 N, armature rated current is 100 A and back emf constantis 0.25 V/rpm. Determine the no-load speed if the no-load armaturecurrent is 5 A and firing angle is 45°. Also determine the firing angle toobtain a speed of 1500 rpm at rated current.

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Answered: A Three-phase half-controlled thyristor…

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

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

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