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

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 (α − η)/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 V cm2), while the c-C4F8 content in the gas mixtures is varied over the range 0–100%. From the variation curve of (α − η)/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.

[1]  Tadasu Takuma,et al.  Applying a gas mixture containing c-C/sub 4/F/sub 8/ as an insulation medium , 2001 .

[2]  M. Dincer,et al.  Simulation of limiting field behavior in electron swarms in SF/sub 6/+N/sub 2/ gas mixtures , 1994 .

[3]  L. G. Christophorou,et al.  Gaseous Dielectrics III , 1982 .

[4]  J L Hernández-Ávila,et al.  Electron transport and swarm parameters in CO2 and its mixtures with SF6 , 2002 .

[5]  Yousfi,et al.  Monte Carlo simulation of electron swarms at low reduced electric fields. , 1994, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[6]  D. Xiao,et al.  Swarm parameters in SF6 and CO2 gas mixtures , 2001 .

[7]  J. Lucas,et al.  Simulation of electron swarm parameters in carbon dioxide and nitrogen for high E/N , 1979 .

[8]  G. Font,et al.  Cross-section set and chemistry model for the simulation of c-C4F8 plasma discharges , 2002 .

[9]  E. Basurto,et al.  Electron attachment, ionization and drift in c-C4F8 , 2001 .

[10]  H R Skullerud,et al.  The stochastic computer simulation of ion motion in a gas subjected to a constant electric field , 1968 .

[11]  Toshimitsu Musha,et al.  Monte Carlo Calculations of Motion of Electrons in Helium , 1960 .

[12]  D. Xiao,et al.  Monte Carlo simulation of electron swarm parameters in c-C4F8 , 2007 .

[13]  G. Raju,et al.  Monte Carlo simulation of the motion of electrons in SF6 in uniform electric fields , 1983 .

[14]  D. Xiao,et al.  Electron transport coefficients in SF6 and xenon gas mixtures , 2000 .

[15]  James K. Olthoff,et al.  Electron Interactions With SF6 , 2000 .

[16]  James K. Olthoff,et al.  Electron Interactions with c-C4F8 , 2001 .

[17]  M. Naidu,et al.  Electron transport, attachment and ionization in c-C4F8 and iso-C4F8 , 1972 .

[18]  Yoshiharu Nakamura,et al.  Swarm derived electron collision cross section set for the perfluorocyclobutane molecule , 2004 .

[19]  Yoshiharu Nakamura,et al.  Measurements of ionization and attachment coefficients in 0.468% and 4.910% c-C4F8/Ar mixtures and pure c-C4F8 , 2004 .

[20]  Phelps,et al.  Anisotropic scattering of electrons by N2 and its effect on electron transport. , 1985, Physical review. A, General physics.

[21]  Z. Petrović,et al.  Monte Carlo studies of electron transport in crossed electric and magnetic fields in CF4 , 2005 .

[22]  Y. Sakai,et al.  The development of electron avalanches in argon at high E/N values. I. Monte Carlo simulation , 1977 .