摘要
为研究SF_6混合气体的放电参数特性,文中通过两项近似求解Boltzmann方程得到温度为300 K,不同混合比下SF_6/N_2、SF_6/CF_4的电子能量分布函数(EEDF)、折合电离系数α/N、折合吸附系数η/N和折合有效电离系数(α-η)/N,与其他文献结果对比,验证了该计算方法与放电参数的有效性。结果表明:SF_6/N_2、SF_6/CF_4两种混合气体都随折合场强E/N增大时,在较低电子能量区域的EEDF减小而在较高电子能量区域的EEDF增大,且SF_6/N_2混合气体在电子能量为3 e V附近存在EEDF的骤降现象,该现象与N_2的碰撞参数截面有关,而SF_6/CF_4混合气体不存在此现象;此外,SF_6/N_2、SF_6/CF_4两种混合气体随着折合场强E/N增大,折合电离系数α/N显著增大、折合吸附系数η/N减小,最终折合有效电离反应系数(α-η)/N也均随之增加。
To study the discharge parameter characteristics of SF6 mixtures, with the ＂two-term＂ approximation to solve the Bohzmann equation, the discharge parameters of different mixing ratio of SF6/N2, SF6/CF4 mixtures can be acquired including the electron energies distribution function （EEDF）, the equivalent ionization coefficient （α/ N） and the equivalent attachment coefficient （η/N）, as well as the equivalent effective ionization coefficient . The effectiveness of the calculation method and results are proved by comparing with other experimental data. Results show that with an increase in E/N, the EEDF of the two mixtures in low-energy region decreases, while the EEDF in the high-energy region increases. The EEDF of SF6/N2 gas mixtures frequently decreases at electron energy of 3 eV. This phenomenon is related to the collision parameters of N2, but don＇t exist in SF6/CF4 gas mixtures. When E/N is increased, the equivalent ionization coefficients of both mixtures have a significant increase with the attachment coefficient reduced, and the equivalent effective ionization coefficient also increases.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第12期60-65,共6页
High Voltage Apparatus
基金
国家自然科学基金项目(51277123)
国网辽宁省电力有限公司科技项目(2015YF-62)~~
