Powersystemfaultanalysis-ppt-160418085001.pdf
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- Pages: 79
www.elecsolution.com
Karikalan.M
1) 2)
3) 4)
2
2
1
1
1
3 2
3
3
2
90
I2 135
45
V2 V1
180
225
0
315
I1 270
C Phase Symmetrical Component View of an A to B Phase Fault
90
135
45
V2 180
V1
V0
225
315
I1 I0 I2 270
0
90
135
45
I2
I0 V2 V0
180
225
I1 270
V1
315
0
IA
IB
IC
IR
100 0 -100 100 0 -100 100 0 -100 200 -0 -200 1
2
3
4
5
6 Cycles
7
8
9
10
11
90
135
45
V2 180
I0
I1
I2
V1
225
315
270
0
Fault incident on voltage
zero point results in Asymmetrical current wave
Karikalan.M
Dead time -1 sec
Dead time -1 sec
Karikalan.M
In inductive circuits the current normally lags the voltage by 90, and magnetic flux is normally in phase with the inductive magnetizing current that has created it. Therefore, at the transformer energization instant the required magnetic flux should be at 90, to correspond to the high-side zero-voltage point. But the transformer magnetic circuit has no flux, and as a result the flux must start at the zero point and overshoot to twice the maximum value during the first voltage cycle. This will cause core saturation, forcing the generation of a sharp unidirectional peaking nonsinusoidal magnetizing current waveform that may persist for several seconds.
L
H
Microsoft Office Word 97 - 2003 Document
Karikalan.M
VA
VB
VC
IA
IB
IC
25 0 -25 25 0 -25 25 0 -25 2500 0 -2500 2500 0 -2500 2500 0 -2500 1
2
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4
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6 Cycles
7
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11
IA
IB
IC
IR
10000 0 -10000 10000 0 -10000 10000 0 -10000 10000 0 -10000 1
2
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6 Cycles
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IA
IB
IC
10000
0
-10000 10000
0
-10000 10000
0
-10000 1
2
3
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6 Cycles
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IA
5000
IB
IC
IR
0 -5000 5000 0 -5000 5000 0 -5000 2500 0 -2500 1
2
3
4
5
6 Cycles
7
8
9
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11
IA
IB
IC
IR
100 0 -100 100 0 -100 100 0 -100 200 -0 -200 1
2
3
4
5
6 Cycles
7
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9
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11
KARIKALAN.M
Karikalan.M
1) 2)
3) 4)
2
2
1
1
1
3 2
3
3
2
90
I2 135
45
V2 V1
180
225
0
315
I1 270
C Phase Symmetrical Component View of an A to B Phase Fault
90
135
45
V2 180
V1
V0
225
315
I1 I0 I2 270
0
90
135
45
I2
I0 V2 V0
180
225
I1 270
V1
315
0
IA
IB
IC
IR
100 0 -100 100 0 -100 100 0 -100 200 -0 -200 1
2
3
4
5
6 Cycles
7
8
9
10
11
90
135
45
V2 180
I0
I1
I2
V1
225
315
270
0
Fault incident on voltage
zero point results in Asymmetrical current wave
Karikalan.M
Dead time -1 sec
Dead time -1 sec
Karikalan.M
In inductive circuits the current normally lags the voltage by 90, and magnetic flux is normally in phase with the inductive magnetizing current that has created it. Therefore, at the transformer energization instant the required magnetic flux should be at 90, to correspond to the high-side zero-voltage point. But the transformer magnetic circuit has no flux, and as a result the flux must start at the zero point and overshoot to twice the maximum value during the first voltage cycle. This will cause core saturation, forcing the generation of a sharp unidirectional peaking nonsinusoidal magnetizing current waveform that may persist for several seconds.
L
H
Microsoft Office Word 97 - 2003 Document
Karikalan.M
VA
VB
VC
IA
IB
IC
25 0 -25 25 0 -25 25 0 -25 2500 0 -2500 2500 0 -2500 2500 0 -2500 1
2
3
4
5
6 Cycles
7
8
9
10
11
IA
IB
IC
IR
10000 0 -10000 10000 0 -10000 10000 0 -10000 10000 0 -10000 1
2
3
4
5
6 Cycles
7
8
9
10
11
IA
IB
IC
10000
0
-10000 10000
0
-10000 10000
0
-10000 1
2
3
4
5
6 Cycles
7
8
9
10
11
IA
5000
IB
IC
IR
0 -5000 5000 0 -5000 5000 0 -5000 2500 0 -2500 1
2
3
4
5
6 Cycles
7
8
9
10
11
IA
IB
IC
IR
100 0 -100 100 0 -100 100 0 -100 200 -0 -200 1
2
3
4
5
6 Cycles
7
8
9
10
11
KARIKALAN.M
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