Grounding fault protection based on zero sequence current comparison in low resistance grounding system
DOI：10.7667/PSPC171347
Key Words:low resistance grounding system  single-phase ground  high impedance grounding  grounding protection  zero-sequence current comparison
Author NameAffiliationE-mail
LIN Zhichao Huizhou Electric Power Supply Company, Huizhou 516001, China  
LIU Xinxing College of Information and Control Engineering, China University of Petroleum East China, Qingdao 266580, China  
WANG Yingmin Huizhou Electric Power Supply Company, Huizhou 516001, China 35921893@qq.com 
XUE Yongduan College of Information and Control Engineering, China University of Petroleum East China, Qingdao 266580, China  
SUN Difei Huizhou Electric Power Supply Company, Huizhou 516001, China  
WANG Chao Kehui Electric Co., Ltd., Jinan 250101, China  
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Abstract:The application of low resistance grounding mode in distribution network can ensure that the system can eliminate the grounding fault quickly and reduce overvoltage effectively. The setting value, however, of zero-sequence overcurrent protection in low resistance grounding system is too high to act when high impedance grounding fault occurs. This paper puts forward a grounding protection method based on the comparison of zero-sequence current in each feeder. Zero-sequence current in each feeder is collected by centralized protection device. The feeder whose amplitude of zero-sequence current is far greater than the others or whose phase is in advance of other feeders’ for a certain value will be selected as fault feeder. The proposed method with simple principle can be used as backup protection for existing grounding fault protections and can effectively improve the sensitivity of grounding fault protection for low resistance grounding system. This work is supported by National Natural Science Foundation of China (No. 51477184) and Science and Technology Project of Guangdong Power Grid Company Limited (No. 031300KK52160023).
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