Epoxy resin is widely used as such insulation parts of electrical equipment as support insulators and insulating rods due to its excellent electrical insulation

heat resistance

mechanical properties and good plasticity. With the increase of voltage level of electrical equipment

the operation is becoming more and more critical and the insulation failure caused by mechanical stress is becoming more prominent. Based on the reference both at home and abroad

the research progress on insulation breakdown due to electrical tree deterioration of epoxy resin under mechanical stress is reviewed in this paper. The morphological characteristics of electrical tree growth under tensile and compressive stresses are introduced on the bases of different bearing stresses of epoxy resins

and the influence of mechanical stress on electrical tree growth under temperature conditions is summarized. The mechanism of electrical tree deterioration of insulation materials under mechanical stress is explored based on the physical micro-structure and charge transport characteristics of epoxy resin molecular chains and also from an energy perspective. The key issues and solutions for the study of electrical tree branches in epoxy insulation components of electrical equipment is described

which provides a reference for the development of epoxy resin insulation materials with high insulation performance.