Identifying Faulty Feeder for Single-Phase High Impedance Fault in Resonant Grounding Distribution System

Tao Tang, Chun Huang, Zhenxing Li and Xiuguang Yuan
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Tao Tang: College of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
Chun Huang: College of Electrical and Information Engineering, Hunan University, Changsha 410082, Hunan, China
Zhenxing Li: College of Electrical Engineering and New Energy, Sanxia University, Yichang 443002, Hubei, China
Xiuguang Yuan: State Grid Shandong Electric Power Company Qingdao Power Supply Company, Qingdao 266000, Shandong, China

Energies, 2019, vol. 12, issue 4, 1-15

Abstract: The identification of faulty feeder for single-phase high impedance faults (HIFs), especially in resonant grounding distribution system (RGDS), has always been a challenge, and existing faulty feeder identification techniques for HIFs suffer from some drawbacks. For this problem, the fault transient characteristic of single-phase HIF is analyzed and a faulty feeder identification method for HIF is proposed. The analysis shows that the transient zero-sequence current of each feeder is seen as a linear relationship between bus transient zero-sequence voltage and bus transient zero-sequence voltage derivative, and the coefficients are the reciprocal of transition resistance and feeder own capacitance, respectively, in both the over-damping state and the under-damping state. In order to estimate transition resistance and capacitance of each feeder, a least squares algorithm is utilized. The estimated transition resistance of a healthy feeder is infinite theoretically, and is a huge value practically. However, the estimated transition resistance of faulty feeder is approximately equal to actual fault resistance value, and it is far less than the set threshold. According to the above significant difference, the faulty feeder can be identified. The efficiency of the proposed method for the single-phase HIF in RGDS is verified by simulation results and experimental results that are based on RTDS.

Keywords: faulty feeder identification; single-phase to ground; high impedance fault (HIF); resonant grounding distribution system (RGDS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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