A Fault Section Location Method for Small Current Neutral Grounding System Based on Energy Relative Entropy of Generalized S-Transform
He Lianjie1, 2, Shi Changkai1, Yan Zhuo3, Cui Jiarui2, Zhang Bo1
1. China Electric Power Research Institute Beijing 100192 China; 2. School of Automation & Electrical Engineering University of Science and Technology Beijing Beijing 100083 China; 3. Electronic Information Engineering College Hebei University Baoding 071002 China
Abstract Single-phase earth fault occurs in small current neutral grounding system, which generates relatively abundant electrical transient characteristic. Transient zero sequence currents on both sides of the healthy section have high similarity, while both sides of the fault section show a great discrepancy. Thus, a fault section location method based on energy relative entropy of generalized S-transform is proposed. First, taken transient zero sequence current as fault feature, the starting time of the various detection devices to upload data is determined by the zero sequence current fault component. Thereafter, the generalized S-transform for the transient zero sequence current uploaded by various devices on feeders is carried out, and then the time-frequency matrix is obtained. Finally, the difference between the signals on both sides of various sections is represented by energy relative entropy. Through calculation and comparison, the section of maximum entropy is fault section. This method is suitable for different fault positions, fault angles and transition resistances. Simulation results verify the proposed method.
He Lianjie,Shi Changkai,Yan Zhuo等. A Fault Section Location Method for Small Current Neutral Grounding System Based on Energy Relative Entropy of Generalized S-Transform[J]. Transactions of China Electrotechnical Society, 2017, 32(8): 274-280.
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2017, Vol. 32 
