Characteristics of modification effect of nonlinear composites on nonuniform electrical fields in vacuum

摘要

Experimental investigations into the conductivity properties and the dielectric properties of epoxy-ZnO nanocomposites at different filler loadings reveal nonlinear behaviors at certain filler loadings. In order to explore the improvement effect of epoxy-ZnO nanocomposites to electric field distribution in vacuum conditions, samples of needle-plane geometry were made and their resistance characteristics of partial discharge were tested under 100pa. Comparative results are presented which show that the addition of 15% amount of zinc oxide particles in the epoxy resin exhibited advantageous nonlinear conductivity and dielectric properties. And under the condition of vacuum, when the nanometer ZnO doping amount is 5%, it reach the maximum initial voltage of partial discharge, which has 29.2% increase over the pure epoxy resin. The experimental results and studies showed that the nonlinear electric property and interfacial effect of epoxy-ZnO nanocomposite played an important role in improving the effect on the improvement of the non-uniform electric field.