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When there is a persistent discharge latent fault in SF6 switchgear, the electrons released can be captured by SF6 with strong electronegativity to generate SF6−, and the detection of SF6− is helpful to judge the existence and severity of the latent fault of discharge. However, there are no relevant reports on the detection method of SF6− in switchgear. In this paper, the weak interaction between SF6− and H2O is studied by using quantum chemistry theory. The results show that the combination of SF6− and H2O at room temperature is a spontaneous exothermic reaction with an equilibrium constant of 4441.81, which can form a stable complex SF6−·H2O, while the combination of SF6 with H2O is a non-spontaneous endothermic or exothermic reaction, which cannot form a stable complex. Therefore, when SF6 gas containing SF6− comes into contact with H2O, the substance that causes H2O content to decrease is mainly SF6−. The decrease of H2O content can reflect the SF6− content in SF6 gas, so as to realize the detection of SF6 switchgear persistent discharge latent fault.

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A Latent Fault Diagnostic Method Based on the Principle of Weak Interaction Between SF6− and H2O in High Voltage Switchgear

  • 会议论文

  • 发表日期：

    2025年

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  • Mengyuan Xu,
  • Ren Yang,
  • Jun Xue,
  • Jinxing Wang,
  • Lin Cheng

摘要

When there is a persistent discharge latent fault in SF6 switchgear, the electrons released can be captured by SF6 with strong electronegativity to generate SF6−, and the detection of SF6− is helpful to judge the existence and severity of the latent fault of discharge. However, there are no relevant reports on the detection method of SF6− in switchgear. In this paper, the weak interaction between SF6− and H2O is studied by using quantum chemistry theory. The results show that the combination of SF6− and H2O at room temperature is a spontaneous exothermic reaction with an equilibrium constant of 4441.81, which can form a stable complex SF6−·H2O, while the combination of SF6 with H2O is a non-spontaneous endothermic or exothermic reaction, which cannot form a stable complex. Therefore, when SF6 gas containing SF6− comes into contact with H2O, the substance that causes H2O content to decrease is mainly SF6−. The decrease of H2O content can reflect the SF6− content in SF6 gas, so as to realize the detection of SF6 switchgear persistent discharge latent fault.