摘要
车顶绝缘子的污秽放电严重威胁动车组列车的安全稳定运行,泄漏电流是表征绝缘子运行状态的综合特征量,研究车顶绝缘子泄漏电流变化特性的影响因素.首先,搭建了污秽实验与泄漏电流检测平台,制备了不同污秽程度的绝缘子样品;然后,通过无线采集装置获取不同污秽、不同电压等级和湿润程度下的车顶绝缘子泄漏电流;最后,分析了污秽程度、电压等级、湿润程度3 个变量对泄漏电流的影响关系以及变量间的协同作用.结果表明:伞裙表面湿润对污秽程度和泄漏电流之间的正比例关系呈现协同作用,泄漏电流增长率从22.76%增大为119.35%;以单位伞裙面积水分含量表征湿润情况,复合绝缘子伞裙表面最恶劣的湿润程度为16mg/cm2 左右,此时泄漏电流最大.研究结果对于车顶绝缘子的状态监测具有指导意义.
Abstract
The pollution discharge from roof insulators poses a severe threat to the safe and stable operation of E-MUs.Leakage current serves as a comprehensive indicator of the operating state of insulators.This paper aims to study the influencing factors on the variation characteristics of leakage current in roof insulators.Firstly,an experi-mental platform for pollution tests and leakage current detection was established,and insulator samples with different degrees of pollution were prepared.Subsequently,the leakage current of roof insulators was obtained under different pollution levels,voltage ratings,and moisture conditions using a data acquisition device.Finally,the relationships between pollution degree,voltage rating,moisture condition,and leakage current were analyzed,along with their syn-ergistic effects.The results indicate a synergistic relationship between surface moisture and pollution degree,exhibi-ting a proportional effect on leakage current,with the growth rate increasing from 22.76%to 119.35%.The most severe moisture condition on the surface of the composite insulator's umbrella skirt,represented by the moisture con-tent per unit area,was approximately 16mg/cm2,corresponding to the maximum leakage current.The research find-ings have significant implications for the condition monitoring of roof insulators.
维普
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