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Energies 2019, 12(4), 598; https://doi.org/10.3390/en12040598

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

1
College of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
2
College of Electrical and Information Engineering, Hunan University, Changsha 410082, Hunan, China
3
College of Electrical Engineering and New Energy, Sanxia University, Yichang 443002, Hubei, China
4
State Grid Shandong Electric Power Company Qingdao Power Supply Company, Qingdao 266000, Shandong, China
*
Author to whom correspondence should be addressed.
Received: 8 May 2018 / Revised: 2 June 2018 / Accepted: 4 June 2018 / Published: 14 February 2019
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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. View Full-Text
Keywords: faulty feeder identification; single-phase to ground; high impedance fault (HIF); resonant grounding distribution system (RGDS) faulty feeder identification; single-phase to ground; high impedance fault (HIF); resonant grounding distribution system (RGDS)
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Tang, T.; Huang, C.; Li, Z.; Yuan, X. Identifying Faulty Feeder for Single-Phase High Impedance Fault in Resonant Grounding Distribution System. Energies 2019, 12, 598.

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