基于盐碱沙尘地区的接触网绝缘子污闪预警的研究

Study on Pollution Flashover Warning of OCS Insulator in Saline-alkali Sand Dust Area

盐碱沙尘环境是影响接触网绝缘子安全稳定运行的重要因素,但由于气候条件的复杂性和突发性,常用的污区分布图不能据实反映气候的急剧变化,往往造成接触网绝缘元件污闪事故的增加。利用含盐沙尘颗粒动力学方法,结合盐碱沙尘源区气象特性,建立颗粒物的动态沉降模型,探索沙尘颗粒在接触网绝缘子表面快速沉积规律,分析污秽源区下风向各站点的不同灰盐比以及粒径分布,得出各站点在无降水期间受含盐沙尘天气影响的污闪预警时刻。分析表明,在恶劣天气来临之前,可结合污闪预警信息准确定位,进行清扫工作,为污闪预警系统的制定提供一种有效可行的方法。

Salt dust environment is an important factor influencing safe and stable operation of the OCS insulator.Due to the complexity and abruptness of climate,the commonly accepted pollutant distribution map can not be used to reflect the sudden changes of climate,often resulting in increased pollution flashover of OCS insulators.By means of the kinetics of salt and dust particles and in combination with the meteorological characteristics of the source area of saline-alkali sand dust,a dynamic sedimentation model of particulate matter is established to explore the law of rapid deposition of dust particles on the surface of the insulator,to analyze salt dust ratio and particle size distribution at each site in downwind pollution areas and determine the warning time for each site against pollution flashover generated by salt dust when there is no rain.The analysis shows that the pollution can be accurately located and cleaned based on warning information in advance of bad weather,which paves an effective and feasible way to establish the pollution flashover warning system.