输电线路绝缘子在线监测及电网防污闪分析

Transmission insulator on-line monitoring and analysis of power grid antipollution flashover

为研究掌握绝缘子污闪发生特点、降低输电网绝缘子污闪危害,将绝缘子表面泄漏电流、盐密及微气象在线监测技术应用于输电线路中。开展了对现场运行中绝缘子的泄漏电流、盐密和环境温湿度在线监测数据的分析研究,建立了绝缘子表面污秽度、绝缘性能与其表面泄漏电流、盐密和温湿度等因素之间的相互关系模型,指出了仅通过泄漏电流值大小判定绝缘子表面污秽度存在一定的不足,需通过泄漏电流、盐密值和环境温湿度多个在线监测参量值才能远程准确评估绝缘子表面的污秽度和绝缘子绝缘性能。研究结果表明,该研究成果为后期重污秽区线路的状态检修工作提供了重要的科学参考价值。

In order to study insulator flashover occurrence characteristics, reduce the transmission of polluted insulator flashover hazard, the leakage current of insulators, salt density and micro meteorology on-line monitoring technology was implicated in transmission line. The analysis and research of site operation insulator leakage current, salinity and temperature and humidity on-line monitoring data were developed, and the relationship of factors model with the insulator surface contamination,insulating properties and surface leakage current, salinity and temperature and humidity was established. Some deficiencies were presented only by leakage current value judgment of insulator surface contamination degree. Through the leakage current, salt density and environmental temperature and humidity of multiple on-line monitoring parameters, the accurate assessment of insulator surface contamination and insulator strings can be obtained. The results show that, the analysis provides important reference value for the late heavy polluted area line overhaul work.