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To address the issue of compromised monitoring effectiveness of traditional characteristic parameters in zinc oxide (ZnO) surge arresters due to grid harmonic voltage interference, this paper establishes a three-phase ZnO surge arrester circuit simulation model. Utilizing Fast Fourier Transform (FFT) harmonic analysis, the study proposes the adoption of the fifth-harmonic resistive leakage current (IR5th) as a novel monitoring indicator and systematically analyzes its characteristics. The results demonstrate that IR5th exhibits superior immunity to harmonic voltage interference, enhanced sensitivity to fault conditions, and reduced sensitivity to background harmonics. Consequently, IR5th proves to be a more effective indicator than the existing third-harmonic analysis method for diagnosing aging degradation in ZnO surge arresters.

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Research on Diagnostic Methods for Aging Degradation of ZnO Surge Arresters Based on Fifth-Harmonic Resistive Leakage Current

  • 会议论文

  • 发表日期：

    2026年

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  • Yang Shen,
  • Hongbin Zhang,
  • Yuqing Wang,
  • Zhitong Xue,
  • Yongling Lu,
  • Hongshun Liu

摘要

To address the issue of compromised monitoring effectiveness of traditional characteristic parameters in zinc oxide (ZnO) surge arresters due to grid harmonic voltage interference, this paper establishes a three-phase ZnO surge arrester circuit simulation model. Utilizing Fast Fourier Transform (FFT) harmonic analysis, the study proposes the adoption of the fifth-harmonic resistive leakage current (IR5th) as a novel monitoring indicator and systematically analyzes its characteristics. The results demonstrate that IR5th exhibits superior immunity to harmonic voltage interference, enhanced sensitivity to fault conditions, and reduced sensitivity to background harmonics. Consequently, IR5th proves to be a more effective indicator than the existing third-harmonic analysis method for diagnosing aging degradation in ZnO surge arresters.