Abstract

Epoxy/Al 2 O 3 nanocomposites (EP/Al 2 O 3 ) have been used as insulating material of electrical equipment. However, charges accumulated on the surface of EP/Al 2 O 3 are regarded as a weakness point that may cause flashover and insulation failure. Accordingly, the understanding of surface charge dynamics is helpful for the safety of the insulation. This paper focuses on the surface charge accumulation characteristics of EP/Al 2 O 3 nanocomposites under the superposition of electric field and magnetic field. The surface charge distribution is scanned by a Kelvin type probe which has high precision. The results showed that the accumulation of surface charge became serious after the doping of nano-Al 2 O 3 particles. Furthermore, when the sample was charged under a magnetic field, maximum surface charge density became increased as compared with that only under electric field, and the distribution became more irregular. The results also indicated that the addition of nano-Al 2 O 3 particles encouraged the magnetic field on varying the surface charge accumulation behavior.

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