Detection of Cross-Line Successive Faults in Non-Effective Neutral Grounding Distribution Networks

Yuxuan Jin, Bin Wang (), Mingming Xu, Ruirui Xie, Zhi Li and Xuan Dong
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Yuxuan Jin: National Key Laboratory of New Power System Operation and Control, Department of Electrical Engineering Tsinghua University, Haidian District, Beijing 100084, China
Bin Wang: National Key Laboratory of New Power System Operation and Control, Department of Electrical Engineering Tsinghua University, Haidian District, Beijing 100084, China
Mingming Xu: Electric Power Science Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, China
Ruirui Xie: Electric Power Science Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, China
Zhi Li: Zhejiang Huadian Equipment Testing and Research Institute Co., Ltd., Hangzhou 310015, China
Xuan Dong: Electric Power Science Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, China

Energies, 2025, vol. 18, issue 9, 1-19

Abstract: In a non-effectively grounded neutral point distribution network, prolonged feeder operation reduces the insulation level, thereby increasing the likelihood of single-phase grounding faults that can generate over-voltages and eventually lead to successive two-point grounding faults. Existing detection methods for single-phase grounding faults fail to identify the second grounding fault in such scenarios. This paper derives the steady-state analytical expressions for the electrical quantities during faults and examines the characteristic differences at various stages of successive grounding faults under different fault phase sequences. Based on these distinctive features, the paper proposes a detection method for successive cross-line grounding faults with varying fault phases. The effectiveness of the proposed algorithm is verified through both simulation and field data.

Keywords: cross-line fault; successive grounding fault; distribution system; single-phase-to-ground fault (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: 2025
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