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KarikalanTextBox www.elecsolution.com
Karikalan.MKarikalan.M
1)1)1)
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9090
I245135
I245135
0180V1V2
0180V1
225 315
I1I1
270270
C Phase Symmetrical Component View of an A to B Phase FaultC Phase Symmetrical Component View of an A to B Phase Fault
9090
45135 45135
V0 V1V2
0180 V0 V1V2
225 315225 315
I0I1 I0I1I2
270
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V1V2 V0V2
225 315225 315I1I1
270
IA IB IC IRIA IB IC IR
100
0
100
0
-100-100
100100
0
-100-100
100100
0
-100
0
-100
200200
-0-0
-200-200
1 2 3 4 5 6 7 8 9 10 111 2 3 4 5 6 7 8 9 10 11Cycles
90
45135 45135
V2
I1
V2
0180 I0
I1I2 0180 I0 I2 V1V1
225 315225 315
270270
Fault incident on voltage Fault incident on voltagezero point results inzero point results inAsymmetrical current waveAsymmetrical current wave
Karikalan.MKarikalan.M
Dead time -1 secDead time -1 sec
Dead time -1 secDead time -1 sec
Karikalan.MKarikalan.M
In inductive circuits the current normally lags the voltage by 90, and magnetic flux isIn inductive circuits the current normally lags the voltage by 90, and magnetic flux isnormally in phase with the inductive magnetizing current that has created it.normally in phase with the inductive magnetizing current that has created it.Therefore, at the transformer energization instant the required magnetic flux shouldTherefore, at the transformer energization instant the required magnetic flux shouldbe at 90, to correspond to the high-side zero-voltage point. But the transformerbe at 90, to correspond to the high-side zero-voltage point. But the transformermagnetic circuit has no flux, and as a result the flux must start at the zero point andmagnetic circuit has no flux, and as a result the flux must start at the zero point andmagnetic circuit has no flux, and as a result the flux must start at the zero point andovershoot to twice the maximum value during the first voltage cycle. This will causeovershoot to twice the maximum value during the first voltage cycle. This will causecore saturation, forcing the generation of a sharp unidirectional peakingcore saturation, forcing the generation of a sharp unidirectional peakingnonsinusoidal magnetizing current waveform that may persist for several seconds.nonsinusoidal magnetizing current waveform that may persist for several seconds.
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Microsoft OfficeMicrosoft OfficeWord 97 - 2003 DocumentWord 97 - 2003 Document
Karikalan.MKarikalan.M
VA VB VC IA IB IC
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VA VB VC IA IB IC
025
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250
25
-250
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2500
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2500
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0
-2500
0
-25002500
0
2500
0
-2500-2500
1 2 3 4 5 6 7 8 9 10 111 2 3 4 5 6 7 8 9 10 11Cycles
IA IB IC IRIA IB IC IR
10000
00
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00
-10000-10000
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00
-10000-10000
1 2 3 4 5 6 7 8 9 10 111 2 3 4 5 6 7 8 9 10 11CyclesCycles
IA IB IC
10000
IA IB IC
10000
00
-10000-10000
1000010000
00
-10000-10000
10000
00
-10000-10000
1 2 3 4 5 6 7 8 9 10 111 2 3 4 5 6 7 8 9 10 11CyclesCycles
IA IB IC IR5000
IA IB IC IR5000
00
-500050005000
00
-5000-500050005000
00
-5000-500025002500
00
-2500-2500
1 2 3 4 5 6 7 8 9 10 111 2 3 4 5 6 7 8 9 10 11CyclesCycles
IA IB IC IRIA IB IC IR
100
0
100
0
-100-100
100100
0
-100
0
-100
100
00
-100
200200
-0-0
-200-200
1 2 3 4 5 6 7 8 9 10 111 2 3 4 5 6 7 8 9 10 11CyclesCycles
286733TypewriterKARIKALAN.M
286733Typewriter
286733Typewriter