Electrical breakdown of epoxy and PTFE under dc conditions

Abstract

The dc breakdown strength of an epoxy resin and of polytetrafluorethylene containing mineral fillers is investigated in order to consider their use in high voltage dc applications. Results obtained at temperatures between 25°C and 85°C with voltage rates from 0.2 kV/s to 8 kV/s are presented and analyzed. The performance and the behavior of the materials are discussed.