Abstract With the increase of voltage level, the surface flashover of epoxy composite insulation material becomes an important issue, which restricts the development of UHV (Ultra High Voltage) transmission technology. In this article, a method of using SiC skeleton to construct charge channel was proposed, which can enhance the surface insulation performance of epoxy composite. In addition, we investigated the influence of SiC skeleton structure on charge dissipation and flashover voltage. At the same time, we explored the synergistic influence mechanism of SiC and Al2O3 nanofillers and SiC skeleton on the surface flashover characteristics of epoxy resin. The results showed that the SiC skeleton effectively enhances the surface insulation performance of epoxy resin. When Al2O3 nanofiller and SiC skeleton act simultaneously, the flashover voltage enhancement reached 13.65%. Combining with finite element simulation, the flashover voltage enhancement mechanism of epoxy resin after modified by nanofiller‐skeleton method was analyzed. It showed that the internal charge channel formed by the SiC skeleton plays an important role in suppressing the local field distortion. The results of the study provided a new idea for modifying epoxy composite to improve the flashover voltage.
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