油纸绝缘沿面放电及发展机理
摘要：相对于气体介质放电理论,对工程复合绝缘介质放电物理过程的机理研究甚少。论文对交流耐压下的油纸绝缘沿面放电进行了机理分析和仿真研究。基于气体中沿面放电和液体中流注理论,论文认为沿面放电缺陷模型中的高压电极与油纸绝缘交界面处的三角形区域的高场强将导致初始电子发射。在沿面放电的发展过程中,由于电、热和机械应力的作用下,油纸绝缘系统会产生微小的气泡。在外加电场的作用下,微小气泡导致的电场畸变以及气泡中的电子崩可能是导致沿面放电发展甚至击穿的主要原因。通过COMSOL有限元分析软件,建立了基于真实实验模型的仿真物理模型,对其电场分布进行了计算,并研究了微小气泡等环境因素对于沿面放电发展过程的影响。仿真结果验证了上述机理分析的正确性。
Abstract:The researches on mechanism of discharges in composite insulation dielectrics are less mature than that in gases dielectrics. In this paper, the theoretical analysis and simulation study on surface discharge in oil paper insulation under AC voltage is proposed. Based on streamer theory in liquids and surface discharge process in gas, the high field density in tri-angle area of interface between high voltage polar and oil paper insulation in defect model of surface discharge can lead to initial electron emission. During physical process of surface discharge, little air bubble will be produced in oil paper insulation system under electrical, thermal and mechanical stress effects. Influencing by external electric field, electric field distortion caused by little air bubble and the electron avalanche in air bubble are the main reason that lead to the development of surface discharge and breakdown. Then the physical model based on real experiment model is built by using COMSOL finite element analysis software, the electric field distribution is determined, and such environment factors as little air bubble that influence the development process of surface discharge are analyzed. In the end, the correctness of above mechanism analysis is verified by simulation results.
标题：油纸绝缘沿面放电及发展机理
英文标题：Study on the Mechanism of Surface Discharge in Oil Paper Insulation
作者：陈曦, 王悠, 江天炎, 毕茂强,
关键词：油纸绝缘, 沿面放电, 机理, 物理模型, 有限元,
发表日期：2015-06-09
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