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Metal particle defects inside gas-insulated switchgear (GIS) pose a significant threat to power supply security. The partial discharge (PD) generated by metal particle defects in GIS is typically weak, making detection extremely challenging. Currently, commonly used detection methods in the field struggle to effectively identify this type of defect. Damped AC (DAC) voltage has been widely applied in field testing of power cables due to its advantages, including the absence of power supply interference, a high signal-to-noise ratio in measurement signals, and relatively compact equipment suitable for on-site testing. Building upon previous research, a DAC voltage test system was established using a 252 kV GIS chamber, where two defect models were introduced to simulate and analyze PD excitation and measurement. The study demonstrated the effectiveness of DAC voltage in detecting metal particle defects at different locations within GIS and analyzed the discharge characteristics of different defects under damped oscillatory voltage. Additionally, by varying the frequency of the DAC voltage, the influence of frequency changes on the partial discharge behavior of metal particle defects inside GIS was revealed.

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Study on Partial Discharge Detection of Metal Particle Defects in GIS Based on Damped AC Voltage

  • 会议论文

  • 发表日期：

    2026年

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  • Zhenliang Yuan,
  • Jiarun Li,
  • Shuai She,
  • Wei Wang

摘要

Metal particle defects inside gas-insulated switchgear (GIS) pose a significant threat to power supply security. The partial discharge (PD) generated by metal particle defects in GIS is typically weak, making detection extremely challenging. Currently, commonly used detection methods in the field struggle to effectively identify this type of defect. Damped AC (DAC) voltage has been widely applied in field testing of power cables due to its advantages, including the absence of power supply interference, a high signal-to-noise ratio in measurement signals, and relatively compact equipment suitable for on-site testing. Building upon previous research, a DAC voltage test system was established using a 252 kV GIS chamber, where two defect models were introduced to simulate and analyze PD excitation and measurement. The study demonstrated the effectiveness of DAC voltage in detecting metal particle defects at different locations within GIS and analyzed the discharge characteristics of different defects under damped oscillatory voltage. Additionally, by varying the frequency of the DAC voltage, the influence of frequency changes on the partial discharge behavior of metal particle defects inside GIS was revealed.