基于超声波飞行图的GIS自由金属微粒缺陷诊断研究

摘要

Free metal particle is one of the most common defects of gas insulated switchgear (GIS), which causes insulation faults such as insulatorfiashover etc. easily. The typical defect model of free metal particle was set up and a great lot of partial discharge experiments were taken in lab. Power frequency phase correlation of signals was judged to detect different characteristics of ultrasonicfiighting plot of different defects under different level of testing voltage, which provides a kind of effective recognition and diagnosis method for free metal particle defect in GIS.%自由金属微粒是气体绝缘开关设备(GIS)中最常见的缺陷之一，极易引起绝缘子闪络等绝缘故障。建立了自由金属微粒的典型缺陷模型并进行大量局部放电试验，对信号的工频相位相关性进行判断，确定了不同缺陷类型、不同试验电压下放电超声波飞行图的特征差异，为GIS中自由金属微粒缺陷的识别和诊断提供了一种有效的方法。