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A 480V synchronous generator. 200 kVA, 0.8 power factor lagging, 60 Hz, two poles. connected in Y. It has a synchronous reactance of 0.25Ω and an armature resistance of 0.04Ω at 60 Hz, its own friction losses and with the air are 6 kW and its core losses are 4 kW. The field circuit has a voltage of 200 V and the maximum Is is 10 A. The field resistance is adjustable in a range of 20 to 200 Ω. The generator occ is shown in the figure below. a) How much field current is required so that Vi is equal to 480 v when the generator operates without load? b) What is the internal voltage generated in this machine under nominal conditions? c) How much field current is required for Vi to equal 480 V when the generator is operating at rated conditions? d) How much power and torque must the prime mover of the generator be able to supply?

A 480V synchronous generator. 200 kVA, 0.8 power factor lagging, 60 Hz, two poles. connected in Y. It has a synchronous reactance of 0.25Ω and an armature resistance of 0.04Ω at 60 Hz, its own friction losses and with the air are 6 kW and its core losses are 4 kW. The field circuit has a voltage of 200 V and the maximum Is is 10 A. The field resistance is adjustable in a range of 20 to 200 Ω. The generator occ is shown in the figure below. a) How much field current is required so that Vi is equal to 480 v when the generator operates without load? b) What is the internal voltage generated in this machine under nominal conditions? c) How much field current is required for Vi to equal 480 V when the generator is operating at rated conditions? d) How much power and torque must the prime mover of the generator be able to supply?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A 480V synchronous generator. 200 kVA, 0.8 power factor lagging, 60 Hz, two poles. connected in Y. It has a synchronous reactance of 0.25Ω and an armature resistance of 0.04Ω at 60 Hz, its own friction losses and with the air are 6 kW and its core losses are 4 kW. The field circuit has a voltage of 200 V and the maximum Is is 10 A. The field resistance is adjustable in a range of 20 to 200 Ω. The generator occ is shown in the figure below.
a) How much field current is required so that Vi is equal to 480 v when the generator operates without load?
b) What is the internal voltage generated in this machine under nominal conditions?
c) How much field current is required for Vi to equal 480 V when the generator is operating at rated conditions?
d) How much power and torque must the prime mover of the generator be able to supply?

Open-circuit terminal voltage, V 600 480 360 240 120 0 0.0 1.0 2.0 3.0 4.0 5.0 Field current, A 6.0 7.0 8.0 9.0 10.0
Transcribed Image Text:Open-circuit terminal voltage, V 600 480 360 240 120 0 0.0 1.0 2.0 3.0 4.0 5.0 Field current, A 6.0 7.0 8.0 9.0 10.0
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