植物油纸绝缘的微水扩散特性  

Characteristics of Moisture Diffusion in Vegetable Oil-paper Insulation

作　　者：李剑[1] 陈晓陵[1] 张召涛[1] 廖瑞金[1] 杨丽君[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高电压技术》2010年第6期1379-1384,共6页High Voltage Engineering

基　　金：国家自然科学基金(50877080)~~

摘　　要：植物油纸绝缘的微水扩散特性研究,是采用植物绝缘油作为绝缘材料的高压电气设备内部微水质量分数监测与危险性评估的基础。为此,采用费克第二扩散定律一维模型,推导出菜籽绝缘油浸纸微水扩散方程;设计了菜籽绝缘油浸纸微水扩散实验系统及实验方法,根据实验结果拟合出菜籽绝缘油浸纸中微水扩散系数;根据定解条件并采用分离变量法求解,得出菜籽绝缘油浸纸中微水质量分数分布计算公式,并对菜籽绝缘油浸纸微水质量分数动态分布进行了仿真计算,并与矿物绝缘油浸纸微水质量分数分布计算结果进行对比分析。研究结果表明,由于菜籽绝缘油能通过界面粘滞力、亲水性和氢键作用等方式,对微水从菜籽绝缘油向绝缘纸中的扩散具有明显的抑制作用。On the basis of one-dimensional model of Fick’s second law,a partial differential equation was designed to analyze the moisture diffusing characteristics in rapeseed oil-paper insulation.An experimental system and method for the moisture diffusing characteristics in rapeseed oil-paper insulation were set up,and the moisture diffusivity was fitted according to experimental results.By analyzing the boundary condition and solving the equation,the formula for calculating moisture concentration was obtained,and moisture concentration dynamic distribution curves of oil-paper insulation were simulated.Meanwhile,the mineral oil-paper insulation was coamparatively analyzed.The results indicate that the insulating rapeseed oil can significantly restrain the moisture diffusion from insulating rapeseed oil into paper by viscous force,hydrophilicity and hydrogen bond.

关 键 词：植物绝缘油 油纸绝缘 费克第二定律 微水扩散实验 扩散系数 动态分布 

分 类 号：TM215.4[一般工业技术—材料科学与工程]