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3. Assume that the field current of the generator in Problem-1 has been adjusted so that it supplies rated voltage when loaded with rated current at unity power factor. (You may ignore the effects of RA when answering these questions.) (a) What is the torque angle o of the generator when supplying rated current at unity power factor? (b) What is the maximum power that this generator can deliver to a unity power factor load when the field current is adjusted to the current value? (c) When this generator is running at full load with unity power factor, how close is it to the static stability limit of the machine? (d) Plot the torque angle ô as a function of the power supplied by the generator for these conditions.

3. Assume that the field current of the generator in Problem-1 has been adjusted so that it supplies rated voltage when loaded with rated current at unity power factor. (You may ignore the effects of RA when answering these questions.) (a) What is the torque angle o of the generator when supplying rated current at unity power factor? (b) What is the maximum power that this generator can deliver to a unity power factor load when the field current is adjusted to the current value? (c) When this generator is running at full load with unity power factor, how close is it to the static stability limit of the machine? (d) Plot the torque angle ô as a function of the power supplied by the generator for these conditions.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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3. Assume that the field current of the generator in Problem-1 has been adjusted so that it supplies rated voltage when loaded with rated current at unity power factor. (You may ignore the effects of RA when answering these questions.) (a) What is the torque angle d of the generator when supplying rated current at unity power factor? (b) What is the maximum power that this generator can deliver to a unity power factor load when the field current is adjusted to the current value? (c) When this generator is running at full load with unity power factor, how close is it to the static stability limit of the machine? (d) Plot the torque angle ô as a function of the power supplied by the generator for these conditions. 1. A 480-V 200-kVA 0.8-power-factor-lagging 60-Hz two-pole Y-connected synchronous generator has a synchronous reactance of 0.25 N and an armature resistance of 0.03 N. At 60 Hz, its friction and windage losses are 6 kW, and its core losses are 4 kW. The field circuit has a de voltage of 200 V, and the maximum IF is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 2002. The OCC of this generator is shown in Fig. 1. (a) How much field current is required to make VT equal to 480 V when the generator is running at no load? (b) What is the internal generated voltage of this machine at rated conditions? (c) How much field current is required to make VT equal to 480 V when the generator is running at rated conditions? How much power and torque must the generator's prime mover be capable of supplying? 600 480 360 240 120 0.0 LO 2.0 30 4.0 5.0 6.0 7.0 S.O 9.0 Fidd current, A in 1.OcCof the Cunahennnne anarator Open circait teminal voltape, V
Transcribed Image Text:3. Assume that the field current of the generator in Problem-1 has been adjusted so that it supplies rated voltage when loaded with rated current at unity power factor. (You may ignore the effects of RA when answering these questions.) (a) What is the torque angle d of the generator when supplying rated current at unity power factor? (b) What is the maximum power that this generator can deliver to a unity power factor load when the field current is adjusted to the current value? (c) When this generator is running at full load with unity power factor, how close is it to the static stability limit of the machine? (d) Plot the torque angle ô as a function of the power supplied by the generator for these conditions. 1. A 480-V 200-kVA 0.8-power-factor-lagging 60-Hz two-pole Y-connected synchronous generator has a synchronous reactance of 0.25 N and an armature resistance of 0.03 N. At 60 Hz, its friction and windage losses are 6 kW, and its core losses are 4 kW. The field circuit has a de voltage of 200 V, and the maximum IF is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 2002. The OCC of this generator is shown in Fig. 1. (a) How much field current is required to make VT equal to 480 V when the generator is running at no load? (b) What is the internal generated voltage of this machine at rated conditions? (c) How much field current is required to make VT equal to 480 V when the generator is running at rated conditions? How much power and torque must the generator's prime mover be capable of supplying? 600 480 360 240 120 0.0 LO 2.0 30 4.0 5.0 6.0 7.0 S.O 9.0 Fidd current, A in 1.OcCof the Cunahennnne anarator Open circait teminal voltape, V
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