A 2300-V 1000-kVA 0.8-PF-lagging 60-Hz two-pole Y-connected synchronous generator has asynchronous reactance of 1.1 Q and an armature resistance of 0.15 Q. At 60 Hz, its friction and windage losses are 24 kW, and its core losses are 18 kW. The field circuit has a dc voltage of 200 V, and the maximum If is 10A. The resistance of the field circuit is adjustable over the range from 20 to 2002. The OCC of this generator is shown in Figure below. a. How much field current is required to make Vfequal to 2300 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 2300 V when the generator is running at rated conditions? d. How much power and torque must the generator’s prime mover be capable of supplying?

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A 2300-V 1000-kVA 0.8-PF-lagging 60-Hz two-pole Y-connected synchronous generator has
asynchronous reactance of 1.1 Q and an armature resistance of 0.15 Q. At 60 Hz, its friction
and windage losses are 24 kW, and its core losses are 18 kW. The field circuit has a de voltage
of 200 V, and the maximum If is 10A. The resistance of the field circuit is adjustable over the
range from 20 to 2002. The OCC of this generator is shown in Figure below.
a. How much field current is required to make Vrequal to 2300 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 Vr equal to 2300 V when the generator is
running at rated conditions?
d. How much power and torque must the generator's prime mover be capable of
supplying?
3000
2700
2400
> 2100
1800
1500
1200
900
600
300
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Field current, A
Open-circuit terminal voltage, V
Transcribed Image Text:A 2300-V 1000-kVA 0.8-PF-lagging 60-Hz two-pole Y-connected synchronous generator has asynchronous reactance of 1.1 Q and an armature resistance of 0.15 Q. At 60 Hz, its friction and windage losses are 24 kW, and its core losses are 18 kW. The field circuit has a de voltage of 200 V, and the maximum If is 10A. The resistance of the field circuit is adjustable over the range from 20 to 2002. The OCC of this generator is shown in Figure below. a. How much field current is required to make Vrequal to 2300 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 Vr equal to 2300 V when the generator is running at rated conditions? d. How much power and torque must the generator's prime mover be capable of supplying? 3000 2700 2400 > 2100 1800 1500 1200 900 600 300 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 Field current, A Open-circuit terminal voltage, V
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