气压对SF_6负极性直流局部放电分解特性的影响  

Influence of Atmospheric Pressure on the Decomposition Characteristics of SF_6 Under Partial Discharge at Negative Polarity DC Condition

作　　者：唐炬[1] 黎可 姚强 苗玉龙 曾福平[1] 张潮海[3] TANG Ju;LIKe;YAO Qiang;MIAO Yulong;ZENG Fuping;ZHANG Chaohai(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China;Chongqing Electric Power Research Institute,State Grid Chongqing Power Company,Chongqing 401123,China;Wuhan NARI Limited Company of State Grid Electric Power Research Institute,Wuhan 430074,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072 [2]重庆电力公司电力科学研究院,重庆401123 [3]国网电力科学研究院武汉南瑞有限责任公司,武汉430074

出　　处：《高电压技术》2019年第1期159-166,共8页High Voltage Engineering

基　　金：国家自然科学基金(51607127;51537009);湖北省自然科学基金创新群体项目(2016CFA007)~~

摘　　要：为了探究在负极性直流局部放电(PD)下气压对SF_6分解特性的影响,在研制的直流SF_6组分分解实验平台上,通过系统实验研究,获取了SF_6分解特征组分随压强的变化规律。研究结果表明:在负极性直流PD作用下,SF_6会发生分解生成SO_2F_2、SOF_2、CO_2、SO_2、CF_4这5种稳定的分解产物,且其生成量均随气压的增大而减小,但下降趋势存在差异,并表现出了与交流PD条件下截然不同的变化趋势;SOF_2、SO_2F_2、CO_2、CF_4、SO_2的均方产气速率均随气压的增大而减小,其中CF_4的均方产气速率随气压的增大呈指数规律下降,更适用于在故障诊断中校正气压带来的影响;特征组分体积比值CF_4/CO_2、SO_2F_2/(SOF_2+SO_2)、(CF_4+CO_2)/(SO_2F_2+SOF_2+SO_2)随压强增大呈现出了不同的变化趋势,其中CF_4/CO_2和(CF_4+CO_2)/(SO_2F_2+SOF_2+SO_2)具有较大的分散性,不宜用作故障诊断中的气压影响校正,而SO_2F_2/(SOF_2+SO_2)随气压的增大呈单调递减,更适于用作校正。论文研究表明在负极性直流PD条件下运用SF_6组分分析法进行故障诊断时,必须考虑气压的影响并进行校正。In order to research the influence of atmospheric pressure on the decomposition characteristics of SF6 under partial discharge(PD) at negative polarity DC condition, systematical experiments were carried out on a DC experimental platform of SF6 component decomposition, and the variation of each characteristic component with pressure was obtained. The research results show that, under the PD of negative polarity DC condition, SF6 will decompose to produce five stable decomposition products, which are SO2F2, SOF2, CO2, SO2, and CF4. The concentrations of these five components decrease with the increase of pressure, but the descending trend is different and it is completely different from that at AC PD;the mean square production rates of SOF2, SO2F2, CO2, CF4, and SO2 all decrease with the increase of pressure, and CF4 decreases exponentially with the increase of air pressure, which is more suitable for the correction caused by pressure in fault diagnosis;the ratios CF4/CO2,SO2F2/(SOF2+SO2), and(CF4+CO2)/(SO2F2+SOF2+SO2) show different trends with the increase of pressure, the ratios CF4/CO2 and(CF4+CO2)/(SO2F2+SOF2+SO2) have a large stastic dispersion, which is difficult to be used for correction.The ratio SO2F2/(SOF2+SO2) decreases monotonically with the increase of air pressure, which is more suitable for correction. Therefore, in the case of negative polarity DC PD conditions,the impacts of air pressure and correction should be considered when using SF6 component to analyze fault diagnosis.

关 键 词：SF6 直流局部放电 气压 分解组分 产气均方速率 特征组分含量比值 

分 类 号：TM855[电气工程—高电压与绝缘技术]