The figure shows the excitation curve (including residual voltage) of a 170 kW, 250 V DC shunt generator at rated speed of 850 rpm. The generator has negligible (0 W) armature resistance and a shunt field coil resistance of 50 W. The variable Field Control Rheostat in series with the shunt field coil has variable resistance in the range of 0 – 25 W. Explain your reasoning for choosing the following answers. (a) What is the approximate value induced EMF( Eo) at a field current of 5.6 A and rotor speed of 630 rpm? 375 V 335 V 300 V 275 V 200 V (b) What is the field current when the induced emf is 328 V and the rotor speed is 935 rpm? 4 A 4 A 1 A 8 A 0 A (c) What is the rheostat resistance settings when the induced voltage is 300 V and the generator is turning at 120% rated speed? 65 Ω 47 Ω 32 Ω 25 Ω 2.22 Ω

The figure shows the excitation curve (including residual voltage) of a 170 kW, 250 V DC shunt generator at rated speed of 850 rpm. The generator has negligible (0 W) armature resistance and a shunt field coil resistance of 50 W. The variable Field Control Rheostat in series with the shunt field coil has variable resistance in the range of 0 – 25 W. Explain your reasoning for choosing the following answers. (a) What is the approximate value induced EMF( Eo) at a field current of 5.6 A and rotor speed of 630 rpm? 375 V 335 V 300 V 275 V 200 V (b) What is the field current when the induced emf is 328 V and the rotor speed is 935 rpm? 4 A 4 A 1 A 8 A 0 A (c) What is the rheostat resistance settings when the induced voltage is 300 V and the generator is turning at 120% rated speed? 65 Ω 47 Ω 32 Ω 25 Ω 2.22 Ω

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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