高电压技术2019，Vol.45Issue(4)：1064-1070,7.DOI:10.13336/j.1003-6520.hve.20190321011
SF6替代气体C4F7N-N2电离特性的稳态汤逊法研究
Investigation of Ionization Characteristics of C4F7N-N2 Gas Mixtures as Alternative Gas to SF6 by Steady-state Townsend Method
摘要
Abstract
In order to evaluate the ionization characteristics of C4F7 N-N2 gas mixtures, an experimental apparatus based on steady-state Townsend (SST) method was set up. The normalized ionization coefficient, attachment coefficient as well as effective ionization coefficient of pure SF6 and N2 gases were measured on this SST apparatus and compared with the experimental results reported in literatures, which verified the reliability of the apparatus. Thereby, the ionization characteristics of 9％C4F7 N-91％N2 and 20％C4F7 N-80％N2 gas mixtures were studied, respectively, by measuring currents (～pA) of electronic avalanche in the non-self sustained discharge stage using the SST apparatus under the conditions of 20 ℃and the reduced electric field varying from 200 Td to 500 Td. It is found that the critical insulation strength of20％C4F7 N-80％N2 is 407.43 Td, however, the critical insulation strength of 9％C4F7 N-91％N2 is 305.93 Td. These results show that when there is no self-sustaining discharge in the dielectric, the critical insulation strength of 9％C4F7 N-91％N2 gas mixture is about 85％ of that of pure SF6 gas. However, the critical insulation strength of 20％C4F7 N-80％N2 gas mixture is about 1.15 times that of pure SF6 gas, which shows a better insulation performance than SF6 gas.关键词
C4F7N-N2混合气体/稳态汤逊法/有效电离系数/吸附系数/临界绝缘强度Key words
C4F7N-N2 gas mixtures/steady-state Townsend method/effective ionization coefficient/attachment coefficient/critical insulation strength引用本文复制引用
龙云翔,郭立平,沈震宇,陈成,周文俊,刘伟..SF6替代气体C4F7N-N2电离特性的稳态汤逊法研究[J].高电压技术,2019,45(4):1064-1070,7.基金项目
国家重点研发计划 (2017YFB0902500) （2017YFB0902500）
国家电网公司总部科技项目 (环保型管道输电关键技术) （环保型管道输电关键技术）
