GIS局部放电检测方法的分析研究

为了研究脉冲电流法、超声波法和超高频法检测GIS设备内部局部放电的优缺点,利用220 kV GIS试验段建立了一套GIS局部放电检测平台。应用脉冲电流法、超声波法以及超高频法对高压导体尖端、地电极尖端和悬浮尖端典型缺陷进行了测试,获取大量的实验数据和图谱。试验结果表明:脉冲电流法对缺陷普遍具有较高的灵敏度,但抗干扰能力较差,对于现场应用有一定局限性;超声波法对于局部放电信号灵敏度较低,但是抗电磁干扰性强;超高频法抗干扰能力强且灵敏度高,适合用于现场检测。总体来看,多种检测方法需要配合来综合确认。

Analysis on the Method of GIS Partial Discharge Detection

In order to study the advantages and disadvantages of detecting the partial discharge of in GIS(gas insulated switchgear) by the pulse current method,the ultrasonic method and the UHF method,using 220 kV GIS establish a set of GIS partial discharge detection platform.Application of the three methods,the three kinds of typical defects of the high voltage conductor tip,the ground electrode tip and the suspended tip are detected,access to a large number of experimental data and mappings.The test results show that the sensitivity of the pulse current method is higher,but the ability of anti-interference is lower,and field application has a certain limitation;with regard to the ultrasonic method,the sensitivity is lower,but the ability of anti-interference is higher,and both the ability of anti-interference and the sensitivity of the ultrahigh frequency is high,so it is suitable for the field detection.On the whole,many testing methods need to cooperate to comprehensive confirmation.