GIS中局部放电与气体分解产物关系的试验  

Experiment on the Correlation Between Partial Discharge and Gas Decomposition Products in GIS

作　　者：齐波[1] 李成榕[1] 骆立实[2] 张勇[1] 郑书生[1] 

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [2]华北电网有限公司,北京100045

出　　处：《高电压技术》2010年第4期957-963,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724508)~~

摘　　要：SF6分解气体检测法,因其不受电磁噪声和振动干扰,同时也适用于过热故障的检测等优点,成为对GIS设备进行局部放电检测诊断的重要手段,应用前景广阔。为填补现有文献中关于GIS设备局部放电与SF6分解产物关系的研究空白,在实验室建立了一套能够检测SF6分解气体产物的GIS局部放电研究平台,利用长期加压法研究了局部放电类型、放电严重程度以及气体压强对SF6气体分解产物体积分数的影响以及分解产物体积分数随时间的变化趋势。研究结果表明:在尖刺放电、悬浮放电、沿面放电3种类型中,GIS设备中均产生SOF2+SO2气体与HF气体,上述两种分解气体可作为检测GIS设备局部放电的特征气体;随着局部放电严重程度的加重,SOF2+SO2气体与HF气体体积分数增大,SF6气体分析法比较适用于检测较为严重的放电缺陷;随着SF6气体压强的增大,局部放电产生的SOF2+SO2气体和HF气体的产气速率有下降的趋势。SF6 decomposition method demonstrates a broader application potential in on-line fault detection and diagnosis thanks to its anti-interference against electromagnetic noises and vibration as well as its applicability for the diagnosis of overheating fault. The present study attempts to fill the existing research gap by exploring the correlation between SF6 decomposition products and partial discharge （PD） in GIS （gas insulated metal-enclosed substation）. Based on the simulation of three major PD patterns including protrusion discharge,floating discharge and surface discharge in GIS,long term tests were undertaken to study the impacts of partial discharge pattern,PD severity and SF6 gas pressure over the concentration of SF6 decomposition products as well as the change in concentration over time. It is found that during three PD patterns,SF6 decomposes and generates SOF2＋SO2 and HF. Inversely,the two decomposed gas can be used as characteristic gas in detecting PD in GIS; as PD severity increases,the concentrations of both SOF2＋SO2 and HF increase accordingly. SF6 decomposition method was approved more effective for the diagnosis of severe PD; a negative correlation is identified between SF6 gas pressure and the generation rates of SOF2＋SO2 and HF.

关 键 词：气体绝缘金属封闭组合电器 局部放电 气体分解产物 放电类型 严重程度 气体压强 

分 类 号：TM85[电气工程—高电压与绝缘技术] TM213[一般工业技术—材料科学与工程]