Analysis and fault section location of single-phase open fault for ungrounding system
DOI：10.7667/PSPC171178
Key Words:ungrounding system  single-phase open fault  voltage analysis  fault section location
Author NameAffiliationE-mail
ZHANG Linli State Grid Shandong Electric Power Research Institute, Jinan 250003, China  
CAO Lili College of Information and Control Engineering, China University of Petroleum East China, Qingdao 266580, China  
LI Lisheng State Grid Shandong Electric Power Research Institute, Jinan 250003, China lls@sina.com 
XUE Yongduan College of Information and Control Engineering, China University of Petroleum East China, Qingdao 266580, China  
TIAN Ye State Grid Dongying Power Supply Company, Dongying 257091, China  
FENG Guang Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, China  
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Abstract:Due to the application of insulated wire, the occurrence probability of line break faults in distribution lines increases. There are no effective method to detect line break fault on site. In this paper, based on ungrounding system, a model of single-phase line break fault without grounding is established. Line break location, the ratio of the fault line grounding capacitance to system grounding capacitance, load impedance magnitude and distribution factors are taken into consideration. Variation characteristics of offset voltage at neutral point, line voltage and phase voltage of the line break point are analyzed. According to the variation characteristics of line voltage and phase voltage, this paper proposes fault section location methods respectively to detect single-phase line break fault without grounding. This proposed method can be realized through distribution automation platform or malfunction indicator system, which improves the reliability and applicability of line break fault section location. In the end, this method is verified by Matlab simulation. This work is supported by National Natural Science Foundation of China (No. 51477184).
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