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)
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![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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F98f539f2-d18b-4592-b6df-b0290b33836b%2F1d96b94c-e464-4bea-a8eb-fea798b86a5d%2Fey80rhk_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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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