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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 2. 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 200Ω.

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 2. 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 200Ω.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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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 2 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 1.0 2.0 3.0 4.0 5.0 7.0 0.0 6.0 8.0 9.0 10.0 Field current, A Fig. 1: OCC of the Synchronous Generator Open-circuit teminal voltage, V
Transcribed Image Text: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 2 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 1.0 2.0 3.0 4.0 5.0 7.0 0.0 6.0 8.0 9.0 10.0 Field current, A Fig. 1: OCC of the Synchronous Generator Open-circuit teminal voltage, V
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