The Research of Small Current Single Phase to Earth Fault Selection Method Based on Wavelet Packet Decomposition Coefficient

2013 ◽  
Author(s):  
Hu Peng ◽  
Hu Qinchun ◽  
Shao Bo ◽  
Zhang Weipan ◽  
Sang Zhichao
Keyword(s):  
Single Phase ◽  
Wavelet Packet ◽  
Selection Method ◽  
Wavelet Packet Decomposition ◽  
Small Current ◽  
Earth Fault ◽  
Decomposition Coefficient

Research on the Fault Location of 35kV Distribution Line

2012 ◽  
Vol 433-440 ◽  
pp. 6219-6223
Author(s):  
Feng Yan ◽  
Ru Jun Xu
Keyword(s):  
Traveling Wave ◽  
Fault Location ◽  
Single Phase ◽  
Wavelet Packet ◽  
Pulse Signal ◽  
Wavelet Packet Decomposition ◽  
Phase Line ◽  
Characteristic Wave ◽  
Detection Point ◽  
Distribution Line

A kind of C-type of traveling wave location method is proposed in this paper. After the single phase grounding fault happened, inject a high voltage narrow pulse signal into the fault phase line and the normal one respectively, collect the reflected signals at detection point, make this two signal waveforms subtract and find the corresponding time of fault point characteristic wave, calculate the fault distance by using location equation. Conduct wavelet packet decomposition and reconstruction on the waveform subtraction signal, judge the fault section by comparing energy changed values of node characteristic waves.

A Fault Line Detection Method Based on Wavelet Packet Analysis in Distribution Network

2012 ◽  
Vol 614-615 ◽  
pp. 1833-1840
Author(s):  
Li Li
Keyword(s):  
Single Phase ◽  
Hot Spot ◽  
Wavelet Packet ◽  
Short Circuit ◽  
Rapid Development ◽  
Network System ◽  
Power Network ◽  
Fault Line ◽  
Small Current ◽  
Grounding System

With the rapid development of power network automation, the detection of the default single-phase grounding fault line in small current neutral grounding system has became a hot spot in research of power network system. Generally, power network neutral point is not grounded or grounded through arc-suppression coil grounding. When single phase grounding fault occurs, the power network system is named as small current grounding system since the grounding short-circuit is small due to a low-impedance short circuit.

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