A 6.6-KV, 20-MVA, 0.85-power-factor-lagging. 60-Hz, four-pole A-connected synchronous generator has a synchronous reactance of 1.5 ohm and an armature resistance of I ohm. The friction and windage losses are 0.5 MW, and its core losses are 0.9 MW. The current of the field circuit is adjustable over the range from 0 to 10 A. The oCC of this generator is shown in Figure 1.

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A 6.6-kV, 20-MVA, 0.85-power-factor-lagging. 60-Hz, four-pole A-connected
synchronous generator has a synchronous reactance of 1.5 ohm and an armature
resistance of I ohm. The friction and windage losses are 0.5 Mw, and its core losses are
0.9 MW. The current of the field circuit is adjustable over the range from 0 to 10 A. The
OCC of this generator is shown in Figure 1.
Open cicait churacterisic
19
16
14
12
Field cument CA)
Figure 1
1- Draw the equivalent three phase circuit of this generator.
2. How much field current is required to make the terminal voltage VT (or line
voltage ) equal to 6.6 kV when the generator is running at no load?
3. What is the internal generated voltage E A of this machine at rated conditions?
4- What is the phase voltage Vo of this generator at rated conditions?
5- How much field current is required to make the terminal voltage VT equal to 6.6
kV when the generator is running at rated conditions?
6- Suppose that this generator is running at rated conditions, and then the load is
removed without changing the field current. What would the terminal voltage of
the generator be?
7- Find efficiency at rated conditions?
AD snas -alo
Transcribed Image Text:A 6.6-kV, 20-MVA, 0.85-power-factor-lagging. 60-Hz, four-pole A-connected synchronous generator has a synchronous reactance of 1.5 ohm and an armature resistance of I ohm. The friction and windage losses are 0.5 Mw, and its core losses are 0.9 MW. The current of the field circuit is adjustable over the range from 0 to 10 A. The OCC of this generator is shown in Figure 1. Open cicait churacterisic 19 16 14 12 Field cument CA) Figure 1 1- Draw the equivalent three phase circuit of this generator. 2. How much field current is required to make the terminal voltage VT (or line voltage ) equal to 6.6 kV when the generator is running at no load? 3. What is the internal generated voltage E A of this machine at rated conditions? 4- What is the phase voltage Vo of this generator at rated conditions? 5- How much field current is required to make the terminal voltage VT equal to 6.6 kV when the generator is running at rated conditions? 6- Suppose that this generator is running at rated conditions, and then the load is removed without changing the field current. What would the terminal voltage of the generator be? 7- Find efficiency at rated conditions? AD snas -alo
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