scholarly journals Single-phase grounding fault line selection method based on zero-sequence current increment

2022 ◽  
Vol 8 ◽  
pp. 305-312
Author(s):  
Bai Hao
Keyword(s):  
Single Phase ◽  
Selection Method ◽  
Fault Line ◽  
Fault Line Selection ◽  
Zero Sequence ◽  
Line Selection

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.

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