In order to suppress surface charge accumulation, a nano-SiC/epoxy composite with nonlinear conduction characteristic was employed to coat a pure epoxy substrate in this paper. Surface potential distributions on the insulator were measured after being charged by a pair of finger-shaped electrodes (one was powered at −10 kV, and the other was grounded). For the insulators with and without coating, there were mainly positive potentials on the whole surface, and the area with higher potential located near the high voltage electrode. As the charging time increased, the high potential area began to shrink, indicating a possible charge migration. When the charging time exceeded 60 min, the potential distribution was almost kept unchanged. Compared with the pure epoxy substrate, the amount of surface charges had a slight increment after being coated with 3 wt% nano-particles. The accumulated surface charges were progressively reduced when the content of fillers became higher. Especiall...

中文翻译：

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具有非线性导电特性的纳米SiC /环氧树脂涂层对直流电压下表面电荷积累的贡献

为了抑制表面电荷的积累，本文采用具有非线性导电特性的纳米SiC /环氧树脂复合材料涂覆纯环氧基材。绝缘体上的表面电势分布是在用一对指形电极充电后进行测量的（一个以-10 kV供电，另一个接地）。对于有涂层和没有涂层的绝缘子，整个表面主要有正电势，高电压区域位于高压电极附近。随着充电时间的增加，高电势区域开始缩小，表明可能发生电荷迁移。当充电时间超过60分钟时，电势分布几乎保持不变。与纯环氧基材相比，表面电荷的量在被3wt％的纳米颗粒涂覆之后具有轻微的增加。当填料含量变高时，累积的表面电荷逐渐减少。特别是...