Etude des décharges électriques dans les mélanges soufreazote-cuivre

This paper deals with the study of discharges in gas mixtures SF
₆
-N
₂
in the presence of copper impurity in order to improve the dielectric properties of SF6-N2, used in high-voltage circuit breakers. The ionization coefficient is an important indicator for assessing breakdown in SF6 and its mixtures. The discharge will be described by the Townsend model evolving in a weakly ionized and low pressure mixture. Two types of elastic collisions were considered: electron-electron collision and electron-ion collision. The electronic transport coefficients of the SF
₆
-N
₂
mixture are obtained by integrating the Boltzmann equation in the stationary case and for a uniform field. The results show that N
₂
reduces the proportion of high energy electrons in SF
₆
-N
₂
mixtures and that copper favors low energy electrons.