Abstract:Due to its excellent heat resistance, mechanical, electrical insulating and processing properties, the epoxy resin is widely used in the fields of injection, impregnation and packaging insulation for electrical equipment. According to the domestic and foreign references, the insulation breakdown caused by electrical tree in epoxy resin insulation is discussed. The initiation mechanism is elaborated, including space charge accumulation and migration, local electric field formation, ultraviolet radiation, and electro-mechanical stress chain breaking theory, so as to understand the electrical tree initiation process. Combined with the application conditions of electrical equipment, the influence of superimposed electric field, temperature gradient field, mechanical stress field and humid environment on the electrical tree deterioration is introduced, and the relationship of electrical tree growth morphology and charge transport behavior under the multiple physical fields is summarized. From the perspective of improving the epoxy resin insulation performance, the methods for inhibiting the electrical tree are introduced from the aspects of insulation process control, inorganic doping, and self-healing materials. Based on the molecular configuration, micro-structure, and macroscopic phenomena, the inhibition mechanism is summarized. According to the research progress, relevant suggestions on electrical tree experimental exploration and suppression methods are put forward.
杜伯学, 张莹, 孔晓晓, 李进. 环氧树脂绝缘电树枝劣化研究进展[J]. 电工技术学报, 2022, 37(5): 1128-1135.
Du Boxue, Zhang Ying, Kong Xiaoxiao, Li Jin. Research Progress on Electrical Tree in Epoxy Resin Insulation. Transactions of China Electrotechnical Society, 2022, 37(5): 1128-1135.
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