scholarly journals Fault Line Selection of Non-solidly Grounding System Based on EMD and Correlation Analysis of Zero Sequence Current Break-variable

2021 ◽  
Vol 2087 (1) ◽  
pp. 012021
Author(s):  
Guo Hu ◽  
Qin Jun ◽  
Hai Wu ◽  
Song Hu ◽  
Lei Xia ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Single Phase ◽  
Intrinsic Mode Functions ◽  
Fault Line ◽  
Actual System ◽  
Grounding System ◽  
Fault Line Selection ◽  
Current Break ◽  
Zero Sequence ◽  
Line Selection

Abstract When a single-phase grounding fault occurs in non-solidly grounding system, the zero sequence transient current is nonlinear and non-stationary. Especially when the resonant system is grounded with high resistance, the transient quantity is weak, which brings challenges to data processing. Therefore, empirical mode decomposition (EMD) is proposed to decompose the transient quantity and obtain different intrinsic mode functions (IMF). The IMF with the largest discrimination is selected as the characteristic quantity for correlation analysis. At the same time, considering the existence of unbalanced current in the actual system, in order to avoid the influence of unbalanced current, a single-phase grounding fault line selection algorithm based on EMD decomposition and correlation analysis of zero sequence current break-variable is proposed. Finally, the effectiveness of the method is verified by simulation and field test waveforms.

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.

scholarly journals Small Current Fault Line Selection Based on Improved Empirical Mode Decomposition and Fractal Dimension Method

CONVERTER ◽  
2021 ◽  
pp. 09-18
Author(s):  
Chao Liu, Limei Yan,Yina Zhou
Keyword(s):  
Fractal Dimension ◽  
Fault Line ◽  
Small Current ◽  
Grounding System ◽  
Scale Free ◽  
Fault Line Selection ◽  
Mode Decomposition ◽  
Zero Sequence ◽  
Line Selection ◽  
Line Slope

In this paper, the fault steady state and transient characteristics of small current grounding system are analyzed, and the distribution of transient zero sequence current is introduced. A fault line selection based on EMD and fractal dimension method is proposed. After the parameter is determined, the problem is proposed and improved. Using the simulated annealing K-means algorithm to find the scale-free interval curve to get the line slope is the correlation dimension of the line. Finally, by comparing the size of the associated dimension, you can select the corresponding line of the faulty distribution network.

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