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  

Space Charge Injection and Transport in Propylene Carbonate Under Switching Impulse Voltage

作　　者：司马文霞[1] 施健[1] 杨庆[1] 袁涛[1] 黄思思[1] 曹雪菲[1] 

机构地区：[1]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),重庆市沙坪坝区400044

出　　处：《中国电机工程学报》2014年第36期6568-6577,共10页Proceedings of the CSEE

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。In order to illustrate the dynamic behavior of space charge in liquid dielectric under impulse voltage and its impact on the breakdown characteristic, this paper measured the process of space charge injection and transport in propylene carbonate under switching impulse voltage based on the method of Kerr electro-optic effect. The experiment results have shown strong space charge effects in high-voltage stressed propylene carbonate. The bipolar homocharge case lowers the electric field at both electrodes due to space charge shielding and allows a higher voltage without breakdown. According to the experimental results, the bipolar charge injection model was developed. Based on this model, the distributions of time and space dependent electric field, space charge, liquid conductivity, power dissipation density and the time dependent current density of charge injection were obtained. The simulation results coincide with the measurements by using Kerr method. The model proves that the double electrode layer causes the charge injection at first, and together with electrochemical process, decides the charge transport in liquid.

关 键 词：克尔电光效应 空间电荷 电荷注入 电荷输运 双电层 电化学 

分 类 号：TM85[电气工程—高电压与绝缘技术]