Eo(LL) (V)3000a.25002000150010005000No-load excitation curve @3600rpm0 123456DC Excitation current (A)78The figure above shows the no-load excitation (LL) curve of a 3-ph, 2-pole, 60 Hz, 1000 kVA,2.3 kV synchronous alternator at rated speed. The alternator has negligible resistance and SynchronousReactance Xs = 1.2 92/phase.If the alternator is synchronized to the Power Grid at 2.3 kV (Line to Line), calculate the following:The value of excitation current required for full load current at 0.7 pf lagging(over-excited).9 10(Ctrl) -b. The alternator current and reactive power when it is delivering 80% rated power(0.8 MW) and its DC excitation current is 4 A.

The alternator is a machine which converts mechanical energy to electrical energy. It generates…

a. The value of excitation current required for full load current at 0.7 pf lagging (over-excited). b. The alternator current and reactive power when it is delivering 80% rated power (0.8 MW) and its DC excitation current is 4 A.

a. The value of excitation current required for full load current at 0.7 pf lagging (over-excited). b. The alternator current and reactive power when it is delivering 80% rated power (0.8 MW) and its DC excitation current is 4 A.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Question

Eo(LL) (V)
3000
a.
2500
2000
1500
1000
500
0
No-load excitation curve @3600rpm
0 1
2
3
4
5
6
DC Excitation current (A)
7
8
The figure above shows the no-load excitation (LL) curve of a 3-ph, 2-pole, 60 Hz, 1000 kVA,
2.3 kV synchronous alternator at rated speed. The alternator has negligible resistance and Synchronous
Reactance Xs = 1.2 92/phase.
If the alternator is synchronized to the Power Grid at 2.3 kV (Line to Line), calculate the following:
The value of excitation current required for full load current at 0.7 pf lagging
(over-excited).
9 10
(Ctrl) -
b. The alternator current and reactive power when it is delivering 80% rated power
(0.8 MW) and its DC excitation current is 4 A.

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