吴张建, 李成榕, 齐 波, 等. GIS局部放电检测中特高频法与超声波法灵敏度的对比研究[J]. 现代电力, 2010, 27(3): 31-36.
引用本文: 吴张建, 李成榕, 齐 波, 等. GIS局部放电检测中特高频法与超声波法灵敏度的对比研究[J]. 现代电力, 2010, 27(3): 31-36.
Wu Zhangjian, Li Chengrong, Qi Bo, et al. Partial Discharge Detection for GIS: A Comparison of Sensitivity Between UHF and Ultrasonic Methods[J]. Modern Electric Power, 2010, 27(3): 31-36.
Citation: Wu Zhangjian, Li Chengrong, Qi Bo, et al. Partial Discharge Detection for GIS: A Comparison of Sensitivity Between UHF and Ultrasonic Methods[J]. Modern Electric Power, 2010, 27(3): 31-36.

GIS局部放电检测中特高频法与超声波法灵敏度的对比研究

Partial Discharge Detection for GIS: A Comparison of Sensitivity Between UHF and Ultrasonic Methods

  • 摘要: 为对特高频法和超声波法在GIS设备局部放电检测中的灵敏度进行对比, 以实际的GIS设备为基础, 建立了一套220kV GIS局部放电检测平台, 模拟了实际中较为常见的5类放电缺陷, 利用特高频法和超声波法对5类缺陷在不同电压下的局部放电同时进行了测量, 并对两者获得的起始放电电压、平均视在放电量、放电次数和放电幅值进行了比较。试验结果表明:特高频法对上述5类局部放电的检测均较为灵敏;超声波法对GIS设备中绝缘子表面自由金属颗粒缺陷、绝缘子表面设备外壳内侧金属尖刺缺陷以及高压导体接触不良缺陷引起的局部放电的检测较为灵敏, 但与特高频检测法相比, 灵敏度仍然略低。因此建议以特高频作为GIS设备内部缺陷检测和诊断的主要手段, 超声波法为辅助检测手段。

     

    Abstract: To compare sensitivity of partial discharge detection for GIS between UHF and ultrasonic method, a partial discharge detection platform for 220kV GIS is built based on real GIS equipment. Five cases of partial defect (PD) discharges are simulated, and their values under different voltage level are measured by using of UHF and ultrasonic method. At the same time, such values as initial discharge voltage, average apparent discharge magnitude, discharge times and discharge amplitude, are compared. It can be seen from results that, 1) UHF method show higher sensitivity in detecting the five types of partial discharges; 2) ultrasonic method is sensitive in detecting partial discharges caused by free metallic particles on insulator, mental sharps on inner shell of insulator, and floating electrode on high voltage conductors, but its sensitivity is lower than that of UHF method. Therefore, it is suggested that UHF should be used as major method to detect and diagnose inner defect in GIS, and ultrasonic method as assist detect measure.

     

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