The properties of thermally stimulated currents in epoxy composites degraded with electrical stress

Abstract

T h e electrical degradation phenome -na of epoxy composites t o be used as a molding material for transformers were studied. T h e electrets were first manufactured by applying high voltages to five kinds of specimens given a mixing rate, and then TSC(Thermal1y Stimulated Current) values at the temperature range of -16 0-2OO["Cl were measured from a series of experiments. T h e behaviour of carrier and its origin in epoxy composites were examined, respectively. And various effects of electrical degradation on epoxy composites were also discussed in this study.