Analysis of the insulation characteristics of c-C4F8/CO2 gas mixtures by the Monte Carlo method

作者：Liu, Xueli^*; Wang, Jianwei; Wang, Yanan; Zhang, Zhousheng; Xiao, Dengming

来源：Journal of Physics D: Applied Physics , 2008, 41(1): 015206.

DOI：10.1088/0022-3727/41/1/015206

• Gas insulation
• Insulation characteristics
• Ionization coefficient
• Power equipment

This paper analyses the insulation characteristics of c-C4F8/CO2 gas mixtures using the Monte Carlo method with the null-collision technique and studies the possibility of applying that in the gas insulation of power equipment. The density-normalized effective ionization coefficient (alpha-eta)/N for c-C4F8/CO2 gas mixtures has been calculated using a sample of a pulsed Townsend discharge. The overall density-reduced electric field strength (E/N) could be varied between 150 and 450 Td (1 Td = 10(-17) Vcm(2)), while the c-C4F8 content in the gas mixtures is varied over the range 0-100%. From the variation curve of (alpha-eta)/N with the c-C4F8 mixture ratio k, the limiting field (E/N)(lim) of the gas mixture at different gas contents is determined. The required gas pressure ratios comparable to the insulation property of SF6 and the global warming potential (GWP) at this gas pressure were also investigated. It is found that the limiting field (E/N) lim of the c-C4F8/CO2 gas mixtures is higher than that of SF6/CO2 gas mixtures, and the GWP of the former is significantly lower than that of the latter.

• 出版日期2008-1-7
• 单位上海交通大学