a) b) The value of excitation current required for full load current at 0.7 pf lagging (over-excited). |EO(LL)I IF The alternator current and reactive power when it is delivering 80% rated power (0.8 MW) and its DC excitation current is 4 A. IL Q3ph
a) b) The value of excitation current required for full load current at 0.7 pf lagging (over-excited). |EO(LL)I IF The alternator current and reactive power when it is delivering 80% rated power (0.8 MW) and its DC excitation current is 4 A. IL Q3ph
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter7: Symmetrical Faults
Section: Chapter Questions
Problem 7.3MCQ: The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of...
Related questions
Question
100%
![Eo(LL) (V)
a)
3000
b)
2500
2000
1500
1000
500
0
No-load excitation curve @3600rpm
0 1
2
3 4 5 6
DC Excitation current (A)
7
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 n/phase.
If the alternator is synchronized to the Power Grid at 2.3 kV (Line to Line), calculate the
following:
8 9 10
The value of excitation current required for full load current at 0.7 pf lagging
(over-excited).
|EO(LL)I
IF
The alternator current and reactive power when it is delivering 80% rated power
(0.8 MW) and its DC excitation current is 4 A.
IL
Q3ph](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd4c9ac9b-e9d9-4516-9e12-c298bf6a5a9a%2Fbf79e730-ecd6-45cb-9a5b-5917f2e4000c%2Fbqfqfam_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Eo(LL) (V)
a)
3000
b)
2500
2000
1500
1000
500
0
No-load excitation curve @3600rpm
0 1
2
3 4 5 6
DC Excitation current (A)
7
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 n/phase.
If the alternator is synchronized to the Power Grid at 2.3 kV (Line to Line), calculate the
following:
8 9 10
The value of excitation current required for full load current at 0.7 pf lagging
(over-excited).
|EO(LL)I
IF
The alternator current and reactive power when it is delivering 80% rated power
(0.8 MW) and its DC excitation current is 4 A.
IL
Q3ph
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