1.School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo255000, China;2.Shandong Kehui Electric Power Automation Co., Ltd., Zibo255087, China;3.State Grid Fujian Electric Power Co., Ltd., Fuzhou350001, China
Distinguishing whether faults in medium-voltage distribution lines are caused by lines contacting trees is of great significance for clarifying the causes of forest fires and preventing line faults from causing forest fires. The zero-sequence currents of various high-impedance grounding faults are obtained through prototype experiments in the paper, and the long-term variation features of the zero-sequence current waveforms of high-impedance grounding faults are analyzed. Analysis shows that there are significant differences in the fluctuation, monotonicity, and sharpness of the waveforms of the root-mean-square value of the zero-sequence currents of line with tree-contacting grounding faults compared to other high-impedance grounding faults. A multi-feature fusion parameter set including standard deviation, discrete coefficient, kurtosis, skewness of the zero-sequence current root-mean-square value curve is designed, and an identification method for tree-contacting ground fault of medium-voltage line based on support vector machine is constructed. The results show that the proposed method achieves a fault recognition accuracy of 98%.
This work is supported by State Grid Corporation of China (No. 5500-202221138A-1-1-ZN).
[1] | WANG Pengwei, XU Bingyin, LIANG Dong, et al. Identification Method for Tree-contacting Grounding Fault of Medium-voltage Line Based on Long-term Variation Features of Zero-sequence Current[J]. Automation of Electric Power Systems,2024,48(23):177-187. DOI:10.7500/AEPS20240315002 |