Kinetic behaviors and dielectric strength of SF6 and N2 over the E/N range from 160 to 650Td

Mixing SF₆ with N₂ in appropriate percentage partial pressure and the mixtures show a lot of benefits, therefore, the electron swarm behaviors of SF₆ and N₂ are considered from the kinetic point of view. According to the collision cross sections of SF₆ and N₂, the electron swarm transport coefficients such as the centre-of-mass drift velocity, the ionization coefficient, the attachment coefficient and so on are calculated for the steady-state Townsend, pulsed Townsend and time-of-flight experiments over the E/N range from 160 to 650Td by a Boltzmann equation method. Then the electron energy distributions of SF₆ and N₂ are analyzed in detail, what is more, the density-reduced ionization coefficient alpha/N, the density-reduced attachment coefficient eta/N and the density-reduced effective ionization coefficient alphamacr/N are calculated and their curves are plotted, so the dielectric strength of SF₆ and N₂ could be evaluated, respectively.