特高压直流线路复合绝缘子积污特性仿真及现场实测研究  

Simulation and measurement research on pollution accumulation characteristics of composite insulators on UHVDC transmission lines

作　　者：伍弘 王博 杨凯 马云龙 牛勃 杨国华 WU Hong;WANG Bo;YANG Kai;MA Yunlong;NIU Bo;YANG Guohua(Electric Power Research Institute of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan Ningxia 750011,China;School of Physics and Electronic-Electrical Engineering,Ningxia University,Yinchuan Ningxia 750021,China)

机构地区：[1]国网宁夏电力有限公司电力科学研究院,宁夏银川750011 [2]宁夏大学物理与电子电气工程学院,宁夏银川750021

出　　处：《宁夏电力》2023年第3期34-41,共8页Ningxia Electric Power

基　　金：宁夏自然科学基金资助项目(2021AAC03496)。

摘　　要：针对特高压直流线路现有标准型或钟罩型瓷或玻璃绝缘子积污数据多,复合绝缘子积污数据较少,且多为不带电状态,无法准确获得电场力与风力、重力等综合作用对运行中复合绝缘子积污特性影响程度的问题,以±800 kV特高压直流线路为例,对其运行复合绝缘子带电积污特性开展仿真分析,并在线路综检期间对其现场污秽度进行实测验证。结果表明,污秽颗粒在带电复合绝缘子表面沉积是空气曳力、自身重力和电场力共同作用的结果,污秽颗粒电荷的增加、电场力的增强对颗粒运动过程影响更明显,即大气风力越小,电场力对污秽沉积的作用越明显。特高压直流线路复合绝缘子高压端伞裙的等值盐密高于中、低压端,整串分布且呈“U”型,与带电复合绝缘子的沿串电场分布规律一致。There is more pollution data for standard porcelain or glass insulator of UHVDC transmission lines but relatively less data for composite insulators.Most of them are not charged,which can not accurately obtain the comprehensive influence of electric field force,wind force,gravity,and other comprehensive effects on pollution accumulation characteristics of composite insulators during operation.In view of these existing problems,taking±800 kV UHVDC transmission line as an example,this paper conducts a simulation analysis on the contamination accumulation characte-ristics of the operating composite insulators,and the substantial pollution degree of the composite insulators is measured and verified during the comprehensive inspection of the transmission line.The results show that the deposition of polluted particles on the surface of charged composite insulators results from the combined action of air drag force,gravity,and electric field force.The increase of the charged polluted particles and the enhancement of the electric field force has a more significant effect on the particle motion process,that is,the smaller the atmospheric wind force,the more obvious the effect of the electric field force on pollution accumulation.The equivalent salt deposit density of the umbrella skirt at the high-voltage end of the composite insulator on the UHVDC transmission line is higher than that at the middle and low-voltage ends.The whole string is distributed in a“U”shape,consistent with the distribution rule of the electric field along the string of charged composite insulators.

关 键 词：特高压直流线路 复合绝缘子 积污特性 污秽沉积 仿真分析 

分 类 号：TM715[电气工程—电力系统及自动化]