湿污绝缘子发热模型  

Heating Model of Polluted and Wetted Insulators

作　　者：李佐胜[1] 姚建刚[1] 杨迎建[2] 陈芳[1] 金永顺[1] 苗增强 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]国网电力科学研究院,武汉430074 [3]湖南湖大华龙电气与信息技术有限公司,长沙410012

出　　处：《电工技术学报》2009年第7期21-27,共7页Transactions of China Electrotechnical Society

基　　金：湖南省科技计划(2006GK3043);国网电力科学研究院科研基金(20072440596);长沙市科技计划(20077140619)资助项目

摘　　要：针对现有绝缘子发热模型不能处理表面出现干燥带及干燥带电弧的问题,基于绝缘子表面水分蒸发主要取决于表面发热的假设,提出了一种湿污绝缘子发热分析方法。该方法引入污层表面电阻率、湿润强度、电弧模型,建立了干燥带及干燥带电弧产生的判断条件和不同运行状态绝缘子的发热模型及应用数值分析方法求解。计算机仿真结果揭示了不同运行状态绝缘子的表面发热分布规律、出现干燥带及干燥带电弧对泄漏电流和发热的影响。湿污绝缘子的红外热成像试验结果表明,该模型合理,具有建立污秽模型理论上的参考价值。As the existing heating models of insulators could not solve the problem of the presence of dry band or dry band arc on the insulator surface, a heating analytical method of polluted and wetted insulators is proposed on the assumption that water evaporation mainly depends on heat generation on the insulator surface. By introducing contamination layer surface resistivity, humid intensity and arc model, the judging condition of the generation of dry band or dry band arc and the heating model for each running state are developed and solved by numerical analysis method. The simulation results reveal the thermal distribution on the insulator surface and the impact of the presence of dry band or dry band arc on leakage current and heating. Infrared thermal imaging experiment results of polluted and wetted insulators indicate that the proposed model is reasonable and valuable for establishment of pollution model in theory.

关 键 词：湿污绝缘子 发热模型 发热分布 干燥带电弧 泄漏电流 

分 类 号：TM835[电气工程—高电压与绝缘技术] TM216[一般工业技术—材料科学与工程]