A 350 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 3.2 Q, and an armature resistance of 0.6 Q. The machine supplies a 20 KVA load, at 0.8 PF lagging. How much field current must be supplied to the generator to keep the terminal voltage at 350 V? EA, (V) 65 125 260 290 320 350 380 420 450 470 IF. (A) 0.00 0.5 1.0 2.0 2.25 2.55 2.7 3.0 3.7 4.1 4.25

A 350 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 3.2 Q, and an armature resistance of 0.6 Q. The machine supplies a 20 KVA load, at 0.8 PF lagging. How much field current must be supplied to the generator to keep the terminal voltage at 350 V? EA, (V) 65 125 260 290 320 350 380 420 450 470 IF. (A) 0.00 0.5 1.0 2.0 2.25 2.55 2.7 3.0 3.7 4.1 4.25

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 36RQ

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Question

A 350 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 3.2 Q, and an armature resistance of 0.6 Q.
The machine supplies a 20 KVA load, at 0.8 PF lagging.
How much field current must be supplied to the generator to keep the terminal voltage at 350 V?
EA. (V)
65
125
260
290
320
350
380
420
450
470
IF, (A)
0.00
0.5
1.0
2.0
2.25
2.55
2.7
3.0
3.7
4.1
4.25
Select one:
O a. If = 2.7 A
O b. IF = 2.25 A
O c. None
O d. Ip = 2.55 A
Clear my choice

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