Modeling porous structure of oil-pressboard interface and its effect on electric field distribution

作     者：司马文霞 姜赤龙 毛文奇 唐信 SIMA Wen-xia;JIANG Chi-long;MAO Wen-qi;TANG Xin

作者机构：State Key Laboratory of Power Equipment & System Security and New Technology(Chongqing University) State Grid Hunan Electric Power Corporation Maintenance Company State Grid Hunan Electric Power Corporation 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2015年第22卷第1期

页      面：338-343页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Project(2009CB724504)supported by the National Basic Research Program of China 

主　　题：oil pressboard interface transition region effective permittivity fractal electric field distribution 

摘      要：The oil-pressboard insulation is a typical composite insulation system widely used in the design and manufactory of large power apparatus. The implement of oil-pressboard insulation may lead to surface electrification and discharge at the interface under certain condition. It is of significant importance to take an insight into the phenomenon occurring at the interface. Through experiment, the pressboard is found as a porous material. The interface changes abruptly from bulk pressboard to the bulk oil as a result of the porous structure. A new model is proposed which divides the interface into bulk oil region, transition region, and bulk pressboard region. The width of the transition region is decided according to the microtome figure. The effective permittivity of the transition region is calculated using a new model based on fractal theory. The model is validated and compared with previous calculation model. The effect of the existence of transition region on the electric field distribution is discussed.