Q3 (CLO 3-C3) (10 marks) A 2500-V 1200-kVA 0.8-PF-lagging 650-Hz two-pole Y-connected synchronous generator has a synchronous reactance of 1.5 2 and an armature resistance of 0.18 2. At 50 Hz, its friction and windage losses are 22 kW, and its core losses are 16 kW. The field circuit has a dc voltage of 200 V, and the maximum I is 8 A. The resistance of the field circuit is adjustable over the range from 20 to 200 S. The OCC of this generator is shown in Figure (2); Compute following parameters for performance evaluation of the machine; i. The field current required to make V is equal to 2500 V when the generator is running at no load? ii. The internal generated voltage of this machine at rated conditions? iii. The field current required to makeV equal to 2500 V when the generator is running at rated conditions? iv. The power and torque of generator's prime mover be capable of supplying? Open-circuit terminal voltage. V 3000 2700 2400 2100 1800 1500 1200 900 600 300 0.0 1.0 2,0 20 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Field current. A Figure (2): OCC Curve Page 2 of 3
Q3 (CLO 3-C3) (10 marks) A 2500-V 1200-kVA 0.8-PF-lagging 650-Hz two-pole Y-connected synchronous generator has a synchronous reactance of 1.5 2 and an armature resistance of 0.18 2. At 50 Hz, its friction and windage losses are 22 kW, and its core losses are 16 kW. The field circuit has a dc voltage of 200 V, and the maximum I is 8 A. The resistance of the field circuit is adjustable over the range from 20 to 200 S. The OCC of this generator is shown in Figure (2); Compute following parameters for performance evaluation of the machine; i. The field current required to make V is equal to 2500 V when the generator is running at no load? ii. The internal generated voltage of this machine at rated conditions? iii. The field current required to makeV equal to 2500 V when the generator is running at rated conditions? iv. The power and torque of generator's prime mover be capable of supplying? Open-circuit terminal voltage. V 3000 2700 2400 2100 1800 1500 1200 900 600 300 0.0 1.0 2,0 20 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Field current. A Figure (2): OCC Curve Page 2 of 3
Chapter39: Synchronous Motor Operation
Section: Chapter Questions
Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...
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Transcribed Image Text:Q3 (CLO 3-C3)
(10 marks)
A 2500-V 1200-kVA 0.8-PF-lagging 650-Hz two-pole Y-connected synchronous generator has a
synchronous reactance of 1.5 2 and an armature resistance of 0.18 2. At 50 Hz, its friction and
windage losses are 22 kW, and its core losses are 16 kW. The field circuit has a dc voltage of
200 V, and the maximum I is 8 A. The resistance of the field circuit is adjustable over the range
from 20 to 200 S.
The OCC of this generator is shown in Figure (2);
Compute following parameters for performance evaluation of the machine;
i.
The field current required to make V is equal to 2500 V when the generator is running at no
load?
ii.
The internal generated voltage of this machine at rated conditions?
iii.
The field current required to makeV equal to 2500 V when the generator is running at rated
conditions?
iv.
The power and torque of generator's prime mover be capable of supplying?
Open-circuit terminal voltage. V
3000
2700
2400
2100
1800
1500
1200
900
600
300
0.0
1.0
2,0
20
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Field current. A
Figure (2): OCC Curve
Page 2 of 3
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