The following figures give the O.C.C OF A DC shunt generator at 300 r.p.m 0 2 3 5 Field ampere Armature 7.5 Volt 92 132 162 183 6 190 7 212 a. Plot the O.C.C for 375 r.p.m and determine the voltage to which the machine will excite if field circuit resistance is 40ohm. Comment b. What additional resistance would have to be inserted in the field resistance to reduce the voltage to 200 volts at 375 r.p.m. Comment c. With and without the additional resistance, determine the load current supplied by the generator when its terminal voltage is 200v. Armature reaction is 2V and assume speed to be constant. Armature resistance is 0.4 ohm. Write your comment about the difference.

The following figures give the O.C.C OF A DC shunt generator at 300 r.p.m 0 2 3 5 Field ampere Armature 7.5 Volt 92 132 162 183 6 190 7 212 a. Plot the O.C.C for 375 r.p.m and determine the voltage to which the machine will excite if field circuit resistance is 40ohm. Comment b. What additional resistance would have to be inserted in the field resistance to reduce the voltage to 200 volts at 375 r.p.m. Comment c. With and without the additional resistance, determine the load current supplied by the generator when its terminal voltage is 200v. Armature reaction is 2V and assume speed to be constant. Armature resistance is 0.4 ohm. Write your comment about the difference.

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

Chapter11: Transient Stability

Section: Chapter Questions

Problem 11.3P

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