高电压技术 第 卷 第 期 年 月 日
39 12 2013 1polyimide nano-composite film (100CR)has good resistance against corona,yet the
mechanism of this resistance is not systematically researched.To investigate how inorganic nanoparticles addition
influences the corona resistance of polymide films,we experimentally studied the mechanism of 100CR film against
corona from three aspects,namely film structure,dielectric properties,and high thermal conductivity.The
experimental results show that 100CR film is composed of three layers,of which the surface layer gathers the major
part of inorganic nanoparticles and it protects the interior molecular structure of polyimide.In the meantime,adding
the nanoparticles cannot only increase the film’s dielectric constant but also heighten the energy barrier of
nanoparticle-polymer interface to suppress the charge injection;the addition also increases both the film’s electrical
conductivity and thermal conductivity,which accelerates the charge decay and reduces the deep traps in the film.In
addition,the heat in 100CR film is more easily dissipated due to the enhanced thermal conductivity,so the risk of
thermal breakdown and the damage of partial discharge to the insulation material are lowered,and the injection
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