A 381 V, 50 Hz, Y-connected, eight poles synchronous generator has the OCC given in tabular form below (Phase Voltage versus the field current). The generator has a per-phase synchronous reactance of 0.2 Q, and a negligible armature resistance. At full-load: The machine supplies 690 A armature current at 0.8 PF lagging. How much field current must be supplied to the generator to make the terminal voltage 380 V? E. (V) IF. (A) 0 65 125 260 290 320 350 380 420 450 470 0.00 0.5 10 2.0 2.25 2.55 27 3.0 3.7 4.1 4.25 Answer: The required field current is: Amperes.

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A 381 V, 50 Hz, Y-connected, eight poles synchronous generator has the OCC given in tabular form below (Phase Voltage versus the
field current). The generator has a per-phase synchronous reactance of 0.2 0, and a negligible armature resistance.
At full-load: The machine supplies 690 A armature current at 0.8 PF lagging.
How much field current must be supplied to the generator to make the terminal voltage 380 V?
E (V)
IF. (A)
0
65
125
260
290
320
350
380 420
450 470
0.00
0.5
1.0
2.0
2.25
2.55
27
3.0
3.7 4.1
4.25
Answer:
The required field current is:
Amperes.
Transcribed Image Text:A 381 V, 50 Hz, Y-connected, eight poles synchronous generator has the OCC given in tabular form below (Phase Voltage versus the field current). The generator has a per-phase synchronous reactance of 0.2 0, and a negligible armature resistance. At full-load: The machine supplies 690 A armature current at 0.8 PF lagging. How much field current must be supplied to the generator to make the terminal voltage 380 V? E (V) IF. (A) 0 65 125 260 290 320 350 380 420 450 470 0.00 0.5 1.0 2.0 2.25 2.55 27 3.0 3.7 4.1 4.25 Answer: The required field current is: Amperes.
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