GIS局部放电常规检测和超声波检测方法的应用比较

介绍了几种GIS局部放电常用的检测技术,并应用常规脉冲电流检测法和超声波检测法对模拟的GIS运行中常见的几种典型缺陷,包括带电导体上尖端、壳体内壁上尖端、自由金属颗粒、悬浮电位、绝缘子内气泡以及黏附在绝缘子表面的金属颗粒等进行了检测。再通过对测试系统记录的放电脉冲和超声波脉冲的相位分布比较、不同缺陷在一定电压下的脉冲放电量大小比较,以及不同缺陷超声波脉冲有效值和周期峰值的特征和大小比较,总结得到在上述各种典型绝缘缺陷情况下,应用这两种检测方法所得波形和信号的主要特征,为超声波局部放电检测技术在GIS现场交流耐压试验和运行阶段的有效应用提供参考。

Application Comparison between Conventional and Ultrasonic Detection Methods for GIS Partial Discharge

Some popular technologies for detecting partial discharge(PD) in GIS are described.Some typical simulated defects during GIS operation,such as sharp protuberance on HV conductor,sharp protuberance on inner surface of housing,free particle,floating electrode,void in spacer,and metal particle stuck on insulator surface,etc.,were detected by means of the conventional pulse current detection and ultrasonic detection methods.The phase distributions of discharge pulse and ultrasonic wave pulse,the magnitudes of discharge on different defects under given voltage,and the features and magnitudes of root mean square and periodic peak values of ultrasonic waves from different defects,are respectively compared.The major features of the ultrasonic wave patterns from the two detection methods are hence achieved.These features may be taken as a reference for the application of ultrasonic detection of partial discharge to high voltage test and operation of GIS on site.