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为了研究金属聚合物复合材料的击穿特性,在WZ模型的基础上建立了在绝缘聚合物介质中填充不同体积浓度的理想金属粒子的逾渗模型。利用计算机对放电通道的发展进行仿真,并对得到的仿真图形进行比较,研究了金属颗粒的体积浓度、下极板施加的电压、放电通道内的阈值电压和树点发展的概率指数对放电通道发展的影响。结果表明,金属粒子体积浓度越大,则放电树枝分枝越多。因此,填充金属颗粒可以明显地增强绝缘介质的导电性,其中逾渗阈值为0.6。下极板施加的电压越大,放电通道内的阈值电压和树点发展的概率指数越小,则放电树枝分枝越多,同时放电树枝生长过程中的积累损伤越大,该规律与实际放电情况相符合。
In order to study the breakdown characteristics of metal-polymer composites, a percolation model was established based on WZ model, which filled the insulating polymer with different volume concentration of ideal metal particles. The development of discharge channel was simulated by computer, and the simulation results were compared. The effects of the volume concentration of metal particles, the voltage applied on the lower plate, the threshold voltage in the discharge channel and the probability index of the dendrite development on the discharge channel Impact of development. The results show that the larger the volume concentration of metal particles, the more branch discharge branches. Therefore, filler metal particles can significantly enhance the conductivity of the dielectric, with a percolation threshold of 0.6. The larger the voltage applied to the lower plate is, the smaller the probability value of the threshold voltage and the development of the dendrite point in the discharge channel are, the more branches are discharged and the greater the damage is accumulated during the growth of the discharge branches. This law is different from the actual discharge The situation is consistent.