Analysis of Decomposition Products of SF6 and C4F7N under Low Energy Corona Discharge

Although the breakdown strength and partial discharge characteristics between sulfur hexafluoride (SF6) and perfluoro-nitrile (C4F7N) have been reported in the literature, the study of aging and decomposition under low energy corona activity, and in particular, the potential deterioration of the dielectric properties have not been investigated yet. Since gas discharge is expected to result in the dissociation of the original gas species and recombine into other gaseous compounds, dielectric properties can exhibit significant deviation from the original gas. Therefore, it is crucial to understand the aging process and the impact of corona discharge on the physical properties of insulation gases. This paper summarizes and compares the decomposition characteristics of SF6 and C4F7N based on existing literature. Furthermore, an experimental setup proposed to study the decomposition product of SF6 and C4F7N under low energy corona activity is described. The objective of this paper is to evaluate the possibility and feasibility of using C4F7N to replace SF6 as an insulation gas in future power applications.