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Partial discharge (PD) detection can effectively diagnose and locate internal defects in equipment, and is widely used in gas insulated transmissions (GILs). In this paper, PD detection and localization analysis is conducted based on an actual PD case in the GIL of a hydropower plant. The discharge characteristics are analyzed and it is determined that the discharge is caused by floating potential defect. Furthermore, the precise localization of the discharge source is carried out using the bisector method and time difference method. Subsequently, according to the defect localization result, a bird’s nest is found inside the shielding cover at the top of the bushing. After cleaning the bird’s nest, the discharge signals disappear, which fully validates the PD live detection and localization results. The research of this study can provide good guidance for on-site PD detection and localization.

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A Case Study of GIL Partial Discharge Diagnosis and Localization at a Hydropower Plant

  • 会议论文

  • 发表日期：

    2026年

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  • Ge Zhang,
  • Feng Chen,
  • Zhiyong Shen,
  • Xing Li,
  • Wenjia Li,
  • Dengwei Ding

摘要

Partial discharge (PD) detection can effectively diagnose and locate internal defects in equipment, and is widely used in gas insulated transmissions (GILs). In this paper, PD detection and localization analysis is conducted based on an actual PD case in the GIL of a hydropower plant. The discharge characteristics are analyzed and it is determined that the discharge is caused by floating potential defect. Furthermore, the precise localization of the discharge source is carried out using the bisector method and time difference method. Subsequently, according to the defect localization result, a bird’s nest is found inside the shielding cover at the top of the bushing. After cleaning the bird’s nest, the discharge signals disappear, which fully validates the PD live detection and localization results. The research of this study can provide good guidance for on-site PD detection and localization.