操作冲击电压下碳酸丙烯酯中空间电荷的注入与输运过程

发布时间：2018-11-03 19:40

【摘要】：为了阐明液体电介质在冲击电压作用下空间电荷的动态过程及其对电介质击穿性能的影响,采用基于克尔电光效应的方法,测量了在操作冲击电压作用下碳酸丙烯酯液体电介质中空间电荷的注入与输运过程。实验结果显示了碳酸丙烯酯在电场作用下强烈的空间电荷效应,双极同极性电荷注入加强了对极板的屏蔽作用,降低了电极附近的电场,从而提高了平板电极间液体的击穿性能。根据实验结果,建立了双极同极性空间电荷注入与输运模型,通过该模型计算了电场、空间电荷、介质电导率和能量耗散密度随时间和空间位置的分布,及注入电流随时间的变化规律。仿真结果与克尔电光测量结果较吻合,模型验证了液体中空间电荷注入是由双电层引起的,并与液体中电化学过程共同决定了空间电荷的输运过程。
[Abstract]:In order to elucidate the dynamic process of space charge in liquid dielectric under impulse voltage and its influence on dielectric breakdown performance, a method based on Kerr electro-optic effect is proposed. The process of space charge injection and transport in liquid dielectric of propylene carbonate under the action of operating impulse voltage was measured. The experimental results show that propene carbonate has a strong space charge effect under the action of electric field, and bipolar copolarity charge injection enhances the shielding effect on the electrode plate and reduces the electric field near the electrode. Thus, the breakdown performance of the liquid between the plate electrodes is improved. Based on the experimental results, a model for the injection and transport of bipolar and homopolar space charges is established. The distributions of electric field, space charge, dielectric conductivity and energy dissipation density with time and space position are calculated by the model. And the variation of injection current with time. The simulation results are in good agreement with the results of Kerr electrooptic measurement. The model verifies that the space charge injection in the liquid is caused by the double electric layer, and the transport process of the space charge is determined by the electrochemical process in the liquid.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);
【分类号】：TM21

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