A 3-4, 440V, 11KVA, Y-connected cylindrical rotor alternator with synchronous reactance 8/phase is driven by 240V, 11KW DC shunt motor. The alternator is synchronous with infinite bus 440V, 50HZ. All losses are to be ignored (a) Determine excitation EMF & load angle of the alternator when it delivers rated kVA at unity pf (b) With driving torque to DC shunt motor unaltered, the excitation voltage is increased by 20% fid new load angle, current & pf. Also obtain maximum stable power output & corresponding current & pf
A 3-4, 440V, 11KVA, Y-connected cylindrical rotor alternator with synchronous reactance 8/phase is driven by 240V, 11KW DC shunt motor. The alternator is synchronous with infinite bus 440V, 50HZ. All losses are to be ignored (a) Determine excitation EMF & load angle of the alternator when it delivers rated kVA at unity pf (b) With driving torque to DC shunt motor unaltered, the excitation voltage is increased by 20% fid new load angle, current & pf. Also obtain maximum stable power output & corresponding current & pf
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
Chapter7: Symmetrical Faults
Section: Chapter Questions
Problem 7.3MCQ: The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of...
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