基于不同油纸介电常数配比的油纸沿面放电仿真  

Simulation of Surface Discharge Based on the Different Ratio of Dielectric Constants of Oil and Papers

作　　者：陈刚[1] 黄正勇[1] 段瑜 李剑[1] 姚德贵 Chen Gang;Huang Zhengyong;Duan Yu;Li Jian;Yao Degui(State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044 China;State Grid He’nan Electric Power Corporation Electric Power Research Institute,Zhengzhou 450052 China)

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400044 [2]国网河南省电力公司电力科学研究院,郑州450052

出　　处：《电工技术学报》2020年第S02期620-628,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51425702)。

摘　　要：油纸绝缘系统是保证变压器绝缘性能的重要部分,而油纸表面放电则是导致变压器失效的主要原因之一。该文通过电荷连续性方程和高斯泊松方程构建油纸放电的数学模型及针/板电极仿真模型。研究正雷电冲击电压下不同油/纸介电常数配比系统中纸板与电场方向平行及垂直时的放电特性,分析油纸沿面放电时的电场分布特性和空间电荷分布特性,以及不同油/纸介电常数配比对流注传播路径的影响。结果表明,油/纸介电常数配比直接影响着流注的发展形貌;且纸板介电常数大于绝缘油时,流注越易沿纸板表面发展,流注分布越不均匀。该研究对油纸绝缘系统的设计和选材具有重要的指导意义。Oil-paper insulation system is an essential part of transformer insulation,and oil-paper surface discharge is one of the main causes of transformer failure.In this paper,the mathematical model and multi-physical field simulation model of oil-paper discharge were constructed by Gauss and current continuity equations.The discharge characteristics when the paperboard respectively parallel and perpendicular to the electric field direction in different oil/paper dielectric constant ratio systems under positive lightning impulse voltage were studied.The electric field and space charge distribution characteristics in pure oil and the oil with pressboard existed were analyzed.The influence of different oil/paper dielectric constant ratios on the streamer propagation path was analyzed.The results show that the oil/paper dielectric constant ratio directly affects the development morphology of the streamer.The higher the difference,the easier the streamer grows along the pressboard surface and the more uneven distribution of the electric field.This research has important guiding significance for the design and material selection of the oil-paper insulation system.

关 键 词：植物绝缘油 仿真分析 介电常数 电场分布 空间电荷分布 

分 类 号：TM855[电气工程—高电压与绝缘技术]