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.

Fault Line Selection Research on Single Phase Ground Fault of Small Current Grounding System Based on Wavelet Theory

2014 ◽  
Vol 513-517 ◽  
pp. 3552-3555
Author(s):  
Xiang Gao ◽  
Lu Wang
Keyword(s):  
Single Phase ◽  
Selection Criterion ◽  
Fault Line ◽  
Wavelet Theory ◽  
Small Current ◽  
Grounding System ◽  
Fault Line Selection ◽  
Ground Fault ◽  
Line Selection ◽  
Wavelet Transform Modulus Maximum

For the problem of single-phase ground fault line selection of small current grounding system, in this paper, according to the wavelet theory advantage processing capabilities of transient mutation signal ,line selection criterion based on wavelet transform modulus maximum principle of singularity detection is proposed . By analyzing the single-phase ground fault waveform of small current grounding system in the neutral point not effective grounding system, steady state and transient characteristics of fault occurs is obtained, building bus with three outlets of 10KV small current grounding system simulation model by using MATLAB software, and verifying the validity though a large number of simulation experiments on the method.

Locating Method of Single-Phase Grounding Fault in Small Current Grounding System Based on Distribution Automation

2013 ◽  
Vol 321-324 ◽  
pp. 1423-1428
Author(s):  
Jun Zhou ◽  
Ke Zheng Cao
Keyword(s):  
Single Phase ◽  
System Modeling ◽  
Simulation Method ◽  
Neutral Point ◽  
Distribution Automation ◽  
Fault Line ◽  
Small Current ◽  
Grounding System ◽  
Arc Suppression Coil ◽  
Zero Sequence

In case of the arc suppression coil for neutral point grounding of small current grounding system, when single-phase grounding fault occurs, due to the arc suppression coil for fault line of the compensation effect of the zero sequence current, the fault features is not obvious, it can't implement the fault line selection and fault point location. This paper puts forward a method of change fault lines zero sequence current shortly, namely a resistance inductance (RL) series branch parallel in arc suppression coil, the series branch acts on the system shortly and changes arc suppression coil compensation degree temporarily in single-phase grounding fault. The change of zero sequence residual current only appears the loop from the neutral point to the fault point via the fault line, using FTU (feeder terminal units) on lines monitor the change of zero sequence current on each nodes for fault regional location. And prove this theory the feasibility of the by using MATLAB software of system modeling simulation method.

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