带电检测技术应用于真型开关柜局部放电试验研究

Application of Online Detection in Partial Discharge Test of True Switchgear

目前开关柜带电检测数据为间接量、经验性较强,易造成缺陷误判。为此基于真型开关柜搭建了缺陷模拟试验装置,利用该装置模拟开关柜中常见的针板放电、悬浮放电、沿面放电缺陷,比对超声波检测法(AE)、暂态地电压检测法(TEV)、特高频检测法(UHF)与脉冲电流法(PC),获取了放电典型图谱和带电检测信号-局放量关系,得到了不同缺陷下超声波检测和特高频检测灵敏度相当但大于暂态地电压检测灵敏度,为开展开关柜带电检测定量分析奠定了基础。

The most data of online detection are indirect state and strong experience,so they cause the erroneous judgement of defect easily.Therefore,this paper set up defect simulation test device based on real switch cabinet and simulated pin-to-plate discharge,suspension discharge,surface discharge.Through the comparison of acoustic emission,transient earth voltages,ultra high frequency and pulse current,the law of these discharge is found,the typical map of discharge and the relationship between online detection signal and partial discharge are obtained.It is also gained that the sensibility of acoustic emission and ultra high frequency is similar,and more than transient earth voltages.These finds lay the foundation for quantitative analysis of online detection.