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A 480-V, 60 Hz, A-connected, four-pole synchronous generator has the OCC shown in the figure. This generator has a synchronous reactance of 0.1 and an armature resistance of 0.015 №. At full load, the machine supplies 1200 A at 0.8 PF lagging. Under full-load conditions, the friction and windage losses are 40 kW, and the core losses are 30 kW. Ignore any field circuit losses. 1. What is the speed of rotation of this generator? 2. How much field current must be supplied to the generator to make the terminal voltage 480 V at no load? 3. If the generator is now connected to a load and the load draws 1200 A at 0.8 PF lagging, how much field current will be required to keep the terminal voltage equal to 480 V? How much power is the generator now supplying? How much power is supplied to the generator by the prime mover? What is this machine's overall efficiency? 4. 5. If the generator's load were suddenly disconnected from the line, what would happen to its terminal voltage? 6. Suppose that the generator is connected to a load drawing 1200 A at 0.8 PF leading. How much field current would be required to keep V, 480 V?

A 480-V, 60 Hz, A-connected, four-pole synchronous generator has the OCC shown in the figure. This generator has a synchronous reactance of 0.1 and an armature resistance of 0.015 №. At full load, the machine supplies 1200 A at 0.8 PF lagging. Under full-load conditions, the friction and windage losses are 40 kW, and the core losses are 30 kW. Ignore any field circuit losses. 1. What is the speed of rotation of this generator? 2. How much field current must be supplied to the generator to make the terminal voltage 480 V at no load? 3. If the generator is now connected to a load and the load draws 1200 A at 0.8 PF lagging, how much field current will be required to keep the terminal voltage equal to 480 V? How much power is the generator now supplying? How much power is supplied to the generator by the prime mover? What is this machine's overall efficiency? 4. 5. If the generator's load were suddenly disconnected from the line, what would happen to its terminal voltage? 6. Suppose that the generator is connected to a load drawing 1200 A at 0.8 PF leading. How much field current would be required to keep V, 480 V?

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Instead of delta-connected, please solve it as Y-connected

Open-circuit terminal voltage, V 600 500 400 300 200 100 0 0.0 1.0 2.0 3.0 4.0 5.0 Field current, A 6.0 7.0 8.0 Open-Circuit characteristic of the generator 9.0 10.0
Transcribed Image Text:Open-circuit terminal voltage, V 600 500 400 300 200 100 0 0.0 1.0 2.0 3.0 4.0 5.0 Field current, A 6.0 7.0 8.0 Open-Circuit characteristic of the generator 9.0 10.0
A 480-V, 60 Hz, A-connected, four-pole synchronous generator has the OCC shown in the figure. This generator has a synchronous reactance of 0.1 and an armature resistance of 0.015 . At full load, the machine supplies 1200 A at 0.8 PF lagging. Under full-load conditions, the friction and windage losses are 40 kW, and the core losses are 30 kW. Ignore any field circuit losses. 1. 2. What is the speed of rotation of this generator? How much field current must be supplied to the generator to make the terminal voltage 480 V at no load? 3. If the generator is now connected to a load and the load draws 1200 A at 0.8 PF lagging, how much field current will be required to keep the terminal voltage equal to 480 V? 4. How much power is the generator now supplying? How much power is supplied to the generator by the prime mover? What is this machine's overall efficiency? 5. If the generator's load were suddenly disconnected from the line, what would happen to its terminal voltage? 6. Suppose that the generator is connected to a load drawing 1200 at 0.8 PF leading. How much field current would be required to keep V, 480 V?
Transcribed Image Text:A 480-V, 60 Hz, A-connected, four-pole synchronous generator has the OCC shown in the figure. This generator has a synchronous reactance of 0.1 and an armature resistance of 0.015 . At full load, the machine supplies 1200 A at 0.8 PF lagging. Under full-load conditions, the friction and windage losses are 40 kW, and the core losses are 30 kW. Ignore any field circuit losses. 1. 2. What is the speed of rotation of this generator? How much field current must be supplied to the generator to make the terminal voltage 480 V at no load? 3. If the generator is now connected to a load and the load draws 1200 A at 0.8 PF lagging, how much field current will be required to keep the terminal voltage equal to 480 V? 4. How much power is the generator now supplying? How much power is supplied to the generator by the prime mover? What is this machine's overall efficiency? 5. If the generator's load were suddenly disconnected from the line, what would happen to its terminal voltage? 6. Suppose that the generator is connected to a load drawing 1200 at 0.8 PF leading. How much field current would be required to keep V, 480 V?
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