Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (3): 113-118.doi: 10.6040/j.issn.1672-3961.0.2020.159

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Comprehensive protection scheme for grounding fault in low resistance grounding system

HUANG Fuquan1, WANG Tinghuang1, ZHANG Haitai2, LIU Zijun1, LI Guodong1   

  1. 1. Shenzhen Power Supply Bureau Co., Ltd., Shenzhen 518000, Guangdong, China;
    2. Shandong Kehui Power Automation Co., Ltd., Zibo 255001, Shandong, China
  • Online:2021-06-20 Published:2021-06-24

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Abstract: Because the existing grounding protection in low resistance grounding system had imcomplete protection configuration, poor selectivity, low sensitivity and insufficient ability to detect high-imedance grounding fault, the characteristics of zero sequence current while single-phase grounding fault occured in low resistance grounding system was analyzied. With the help of longitudinal cooperation between the upper and lower protections, the multistage grounding protection based on zero sequence current and the high sensitivity grounding protection based on low setting and time delay were proposed, and also the grounding protection configuration scheme and the setting principles at all levels were discussed. Fault line selection method was proposed for the high-impedance grounding fault using the lateral comparasion of the amplitudes of zero sequence currents between the outlet of each feeder and the neutral line. The feasibility and reliability of the proposed comprehensive protection scheme for grounding fault were verified by the simulation in a typical small resistance grounding distribution network.

Key words: low resistance grounding system, grounding protection, zero sequence current, high resistance grounding, comprehensive protection

CLC Number: 

  • TM773
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