基于氧同位素示踪法的电晕放电中H_2O和O_2对SF_6分解气体形成的影响  

Influence of Trace H_2O and O_2 on SF_6 Decomposition Characteristics under Corona Discharge Based on Oxygen Isotope Tracer

作　　者：赵明月 林涛[1] 颜湘莲 韩冬[1,2] 张国强 Zhao Mingyue;Lin Tao;Yan Xianglian;Han Dong;Zhang Guoqiang(Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China;University of Chinese Academy of Sciences Beijing 100049 China;China Electric Power Research Institute Beijing 100192 China)

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院大学,北京100049 [3]中国电力科学研究院有限公司,北京100192

出　　处：《电工技术学报》2018年第20期4722-4728,共7页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划(2017YFB0902500);国家自然科学基金(51507165;51477162)资助项目

摘　　要：SF_6气体绝缘电气设备发生放电故障时,SF_6气体将分解为低氟硫化物,并进一步与H_2O、O_2等杂质反应,生成SO_2F_2、SOF_2和SO_2等气体。作为SF_6气体放电的特征产物,H_2O和O_2直接参与SO_2F_2的生成过程,因此SO_2F_2的含量与H_2O和O_2密切相关。为此,本文在工频电晕放电实验基础上,基于氧同位素示踪法,通过注入不同含量的同位素H_218O和18O_2,分析了微量H_2O和O_2对SO_2F_2的三种同位素化合物S16O_2F_2、S18O16OF_2和S18O_2F_2之间含量比值变化规律的影响,在此基础上进一步解释了SO_2F_2的形成机制。SF6 gas can decompose into lower fluorides of sulfur under electrical discharge,and then these lower fluorides will oxidize in the presence of water vapor and oxygen,resulting in the formation of decomposition by-products such as SO2F2,SOF2 and SO2.SO2F2 is one of the main and stable decomposition by-products of SF6 gas.Since trace H2O and O2 can participate in SF6 decomposition process directly,the formation of SO2F2 is closely related to H2O and O2.In this paper,the effects of H2O and O2 on SF6 decomposition characteristics under corona discharge have been investigated based on oxygen isotope tracer method.By injecting different concentrations of H2 18O and 18O2,a series of corona discharge experiments are carried out.Then the concentration ratios of the S16O2F2,S18O16OF2 and S18O2F2 are analyzed respectively,under different concentrations of H2 18O and the ratios of 18O2 to 16O2.Finally,the formation mechanism of SO2F2 is discussed.

关 键 词：SF6 电晕放电 SF6气体分解物 氧同位素示踪法 

分 类 号：TM835[电气工程—高电压与绝缘技术]