电工技术学报2016，Vol.31Issue(10)：77-84,8.
含污秽薄层的高压复合绝缘子表面电场计算新方法
Novel Method for Electric Field Calculation Considering the Thickness of Contaminant Layer on the Surface of Composite Insulator
摘要
Abstract
To study the mechanism of composite insulator pollution flashover, electric field analysis of the polluted composite insulators is required. However, the thickness of the contamination layer is only a fraction of millimeter that is much smaller than the size of insulator itself. Consequently, neither the finite element method nor boundary element method can solve such field problems with multiple scales at present. Therefore, This paper proposes a new method to calculate the surface electric field of polluted insulator based on the digital image processing. First, binary image processing is applied to the image of insulator with sizem×n, and regional meshing is realized 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)×(m×n) is formed. The distribution of surface electric field of polluted insulator is calculated by electrical network analysis using node voltage method. The example shows that, compared with the existing algorithms, this method has significant advantages and improved effectiveness for modeling filthy layer which revealed contamination mechanism of composite insulator surface flashover, corona discharge, etc.关键词
绝缘子/矩阵/像素单元/图像处理/有限元法Key words
Insulator/matrix/pixel unit/image processing/finite element method分类
信息技术与安全科学引用本文复制引用
汪沨,廖平军,黄俊,罗勇,肖运军..含污秽薄层的高压复合绝缘子表面电场计算新方法[J].电工技术学报,2016,31(10):77-84,8.基金项目
高等学校博士学科点专项科研基金(20120161110009)和电力设备电气绝缘国家重点实验室(EIPE13207)资助项目. （20120161110009）
