A 480 V, 50 Hz, Y-connected, six-pole synchronous generator has the OCC shown in Figure below. This generator has a synchronous reactance of 0.1 02 and an armature resistance of 0.012 2. At full load, the machine supplies 700 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. i. ii. iii. iv. V. vi. 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? If the generator is now connected to a load and the load draws 700 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? If the generator's load were suddenly disconnected from the line, what would happen to its terminal voltage? Finally, suppose that the generator is connected to a load drawing 700 A at 0.8 PF leading. How much field current would be required to keep V₁ at 480 V? 600 540 > 480 Open circuit terminal voltage, V 420 360 300 240 180 120 60 0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Field current, A 7.0 8.0 9.0 10.0
A 480 V, 50 Hz, Y-connected, six-pole synchronous generator has the OCC shown in Figure below. This generator has a synchronous reactance of 0.1 02 and an armature resistance of 0.012 2. At full load, the machine supplies 700 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. i. ii. iii. iv. V. vi. 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? If the generator is now connected to a load and the load draws 700 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? If the generator's load were suddenly disconnected from the line, what would happen to its terminal voltage? Finally, suppose that the generator is connected to a load drawing 700 A at 0.8 PF leading. How much field current would be required to keep V₁ at 480 V? 600 540 > 480 Open circuit terminal voltage, V 420 360 300 240 180 120 60 0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Field current, A 7.0 8.0 9.0 10.0
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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Transcribed Image Text:A 480 V, 50 Hz, Y-connected, six-pole synchronous generator has the OCC shown in Figure
below. This generator has a synchronous reactance of 0.1 02 and an armature resistance of
0.012 02. At full load, the machine supplies 700 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.
i.
ii.
iii.
iv.
V.
vi.
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?
If the generator is now connected to a load and the load draws 700 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?
If the generator's load were suddenly disconnected from the line, what would happen
to its terminal voltage?
Finally, suppose that the generator is connected to a load drawing 700 A at 0.8 PF
leading. How much field current would be required to keep V₁ at 480 V?
600
Open circuit terminal voltage, V
540
> 480
420
360
300
240
180
120
60
0
0.0 1.0 2.0 3.0
4.0
Field current, A
5.0 6.0 7.0
8.0
9.0 10.0
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