Abstract
Epoxy resin insulating materials have been extensively applied to main power transmission and transformation equipment. As the use environment of power transmission and transformation equipment becomes increasingly harsh, the reliability requirement of power grids for equipment is becoming higher and higher. It’s very necessary to master electrical and mechanical properties of low-temperature epoxy resin insulating materials. Dielectric properties, power-frequency breakdown properties, power-frequency flashover properties and mechanical properties of epoxy resin insulating materials under low temperature were investigated in this paper. The study results indicate that as the temperature declines, dielectric properties of epoxy resin composite materials are slightly degraded. After the temperature drops to below -40°C, dielectric properties start being gradually recovered to the state under normal temperature; AC breakdown, AC flashover and tensile properties of the materials are gradually improved as the temperature decreases.
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