Analysis of insulation characteristics of c-C₄F₈and N₂gas mixtures by the Monte Carlo method

Abstract

The motion of electrons in c-C4F8 and N2 gas mixtures for a pulsed Townsend discharge is simulated by the Monte Carlo method. The effective ionization coefficient, , over the E/N range from 160 to 480 Td is calculated by employing a set of cross sections available in the literature. From the variation curve of with the C4F8 mixture ratio k, the limiting field of the gas mixture at different gas content is determined. The required gas pressure ratios comparable with the insulation property of SF6 and GWP at this gas pressure were also investigated. It is found that the insulation characteristics of the N2 and c-C4F8 gas mixtures are comparable with the N2 and SF6 mixture, but the GWP of the former is significantly lower than that of the latter. Simulation results show excellent agreement with experimental data available in the literature.

SF6-alternative gases for application in gas-insulated switchgear

“…The representative potential alternative gases include fluorinated gases (e.g. CF 3 I [23][24][25][26], c-C 4 F 8 [27][28][29]), perfluoroketones (PFK) (e.g. C5-PFK or CF 3 COCF(CF 3 ) 2 ) [30,31] and perfluoronitriles (PFN) (e.g.…”

Analysis of the insulation characteristics of c-C4F8/CO2gas mixtures by the Monte Carlo method

“…The gas number density is N = 3.29 × 10 22 m −3 in the pressure of 1 Torr at 20 • C. It is assumed that the electron density is sufficiently small, so the Coulomb interactions between the particles as well as shielding of the field are negligible [17]. The procedure of the Monte Carlo method is described in [15][16][17][18][19][20][21][22][23]25]. Hence, a brief overview of this method is given.…”

Experimental research on insulation properties of C 6 F 12 O/N 2 and C 6 F 12 O/CO 2 gas mixtures

“…Tu et al [10] found that the decomposition of CF 3 I after the breakdown and deposition of solid iodine on the surface of the electrode affect the self-recovery of gas. The insulation performance of c-C 4 F 8 , C 3 F 8 , and C 2 F 6 can reach the level of SF 6 in [11,12]. Notably, the GWP values of these compounds at 8700, 7000, and 9200 are less than the value of SF 6 [13], but also could not be ignored.…”