高浓度工业粉尘环境下宁夏地区线路瓷绝缘子积污模拟仿真

Simulation of contamination deposition on porcelain insulators of transmission lines in Ningxia under high concentration industrial dust environment

针对目前宁夏部分地区工业粉尘污染污秽浓度偏高的特点,考虑宁夏电网绝缘子表面不均匀粗糙度的实际情况,基于能量守恒原理得到高污秽覆盖下绝缘子表面污秽颗粒沉积模型,采用COMSOL仿真软件搭建多物理场耦合绝缘子自然积污仿真模型;以宁夏吴忠某工业园区附近110 kV交流输电线路瓷绝缘子为研究对象,模拟研究风速、粒径、污秽成分及电压类型对绝缘子表面自然积污特性的耦合影响。结果表明:交流场中污秽粘附率沿伞裙呈不规则“M”型分布且二氧化硅粘附率最高;在直流场中污秽粘附率沿伞裙呈“U”型分布且氧化铁粘附率最高;与均匀粗糙表面绝缘子积污仿真模型相比,本文所提模型可有效提高模拟结果的准确性,更真实地反映出高污秽工业粉尘环境下绝缘子串各伞裙的积污分布情况。

In view of the high concentration of industrial dust pollution in some areas of Ningxia at present,considering the actual situation of uneven roughness of insulator surface in Ningxia power grid,the pollution particle deposition model of insulator surface under high pollution coverage was obtained based on the principle of energy conservation.The multiple physical field coupling insulator natural pollution simulation model was built by using COMSOL simulation software.Taking porcelain insulators of 110 kV AC transmission line near an industrial park in Wuzhong,Ningxia as the research object,the coupling effects of wind speed,particle size,pollution composition,and voltage type on the natural contamination characteristics of insulator surface were simulated.The results show that the pollution adhesion rate in the AC field shows irregular"M"shape along the shed,and the adhesion rate of silica is the highest.In the DC field,the pollution adhesion rate shows"U"shape along the shed,and the adhesion rate of iron oxide is the highest.Compared with the simulation model of insulator contamination on uniform rough surface,the model proposed in this paper can effectively improve the accuracy of simulation results and better reflect the contamination distribution of each shed of insulator string in the high-pollution industrial dust environment.