The voltage endurance of cast and molded resins

Abstract

This paper describes the factors influencing the voltage or electric stress-failure time relation of cast and molded resins. It also discusses the reasons for similar failure times at equal stresses with surface and internal discharges, when the discharges are continuous, and presents data supporting those reasons. The phenomena of intermittency of internal discharges is also described. Voltage endurance with tiny micro-cavity defects, which may be practically undetectable, is also discussed.