重污绝缘子串电压分布特性的试验研究

Experimental Study on Voltage Distribution Characteristics of Heavy Polluted Insulator String

输电线路绝缘子串的电压分布受污秽分布状态的影响。根据自然污秽的分布规律,将绝缘子盘面污秽分布分为三种类型,在重污条件下对单片绝缘子及绝缘子串进行电压分布特性试验研究。试验结果表明:单片绝缘子污闪电压随等值附盐密度(ESDD)增加而降低;在绝缘子串中存在上盘面粘污不对称的绝缘子时,电压分布的随机性增强。该研究为改善污秽绝缘子串电压分布防止闪络事故提供了依据。

The voltage distribution is affected by the pollution distribution of transmission line insulator string.According to the distribution of natural pollution,the pollution distribution of insulator surface is divided into three types.In heavy pollution conditions,experiments for the voltage distribution characteristics are implemented for the three types.The experimental results show that the monolithic insulator pollution flashover voltage will decrease with the increase of the equivalent salt deposit density（ESDD）;while the randomness of voltage distribution enhance if the asymmetry of surface fouling insulators exist in the insulator string.This study provides the basis for improving the voltage distribution of insulator string.The study provides a basis for improving the voltage distribution for insulator string to prevent flashover accident.