Abstract
Epoxy resin is essential in the superconducting system as an insulating and supporting material. Extreme conditions such as cryogenic temperature, high vacuum, and high electric field could result in insulation failure for Epoxy resin. Surface flashover voltage is usually lower than breakdown voltage for solid materials. In this paper, the DC surface flashover characteristics of nano-Al2O3/epoxy composites (0, 1, 2, 3, 4, and 5%) have been investigated at cryogenic and room temperature. The nano-Al2O3 particles were modified by silane coupling agent (KH560). Epoxy doped with nano-Al2O3 was poured into a self-made mold and experienced a thermosetting process for 14 h. DC flashover tests were performed according to the IEC 60243–1:2013 international standard. The results were evaluated by the Weibull distribution method. The result shows that the DC surface flashover voltage of nano-Al2O3/epoxy composite is strongly related to the addition of nanoparticles and different temperatures. It can be explained by secondary electron emission avalanche (SEEA) and Li’s model.
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