硅橡胶绝缘子含污秽薄层的表面电场计算研究  

Research of Electric Field Calculation Considering the Thickness of Contaminant Layer on the Surface of Silicone Rubber Insulator

作　　者：吴广祥[1] 宋凡峰[1] WU Guangxiang SONG Fanfeng(Shandong Water Polytechnic College, Rizhao 276826, Chin)

机构地区：[1]山东水利职业学院,山东日照276826

出　　处：《电瓷避雷器》2016年第5期42-47,53,共7页Insulators and Surge Arresters

摘　　要：当前的有限元及边界元电场计算方法都无法适用于含薄层污秽的硅橡胶绝缘子表面电场计算问题。为此,提出了一种基于数字图像处理的污秽绝缘子表面电场计算方法,该方法首先对绝缘子图像进行基于提升小波变换进行去噪预处理,接着应用图像处理技术对M×N大小绝缘子图像二值化处理,利用像素单元实现区域的网格剖分,同时在像素单元基础上建立表面电阻数学模型;然后形成(M×N)2大小的节点导纳矩阵,采取节点电压法对其进行电网络分析,得到污秽绝缘子表面电场分布。计算结果表明,较之其他计算方法,该方法对含污层的硅橡胶绝缘子表面电场计算具有明显优势,对诊断硅橡胶绝缘子的憎水性具有一定意义。The current finite element method and boundary element method is not applicable to make the electric field calculation of silicon rubber insulators with thin layer contamination. A method for calculating the surface electric field of contaminated insulator based on digital image processing is proposed. First the insulator image is presented based on lifting wavelet transformation. Then binary image processing is applied to the image of insulator after denoising with size of M ×N and regional meshing is done at each the pixel unit. Meanwhile, a mathematical model of impedance is established based on pixel unit. Then the node admittance matrix of size（M ×N）2is formed.The distribution of surface electric field of polluted insulator is calculated by electrical network analysis using node voltage method. Calculating example show that, compared with the existing algorithms, this method has significant advantages and improved effectiveness for modeling of filthy layer. It has a certain significance to the hydrophobicity of silicone rubber insulators.

关 键 词：绝缘子 表面电场 提升小波 像素单元 矩阵 

分 类 号：TM216[一般工业技术—材料科学与工程]