基于特征粒子追踪方法的绝缘子积污特性仿真研究

Simulation Study on Contamination Accumulation Characteristics of Insulator by Feature Particle Tracking Method

在电力系统安全事故中,污闪事故因影响面积大、时间长,往往导致较为严重的经济损失。为了探究气流场和电场耦合作用下绝缘子的积污特性及绝缘子表面积污量对各影响因素的敏感程度,文中利用多物理场仿真软件建立了典型绝缘子的风洞积污模型,提出了结合抽样调查和特征粒子分析的特征粒子追踪方法。仿真在计算流体动力学的基础上引入交、直流电场的作用,对污秽粒子在一个运动周期内的轨迹进行追踪研究,并根据对单一粒径及荷电量样本仿真结果的加权平均值来确定绝缘子整体积污特性。仿真结果表明,绝缘子表面积污量是电场强度、风速以及污秽颗粒特征粒径等因素的综合作用结果,且不同环境条件下积污量对电场强度变化的敏感程度存在显著差异。

Among all kinds of safety accidents in power system,pollution flashover caused more economic loss because of its large impact area and long impact time.To explore the pollution characteristics of insulators under the coupling effect of air flow and electric field,and contamination’s sensitivity of various influencing factors,a typical insulator’s contamination model in wind tunnel was established with multiphysics simulation software,and a feature particle tracking method was proposed based on sample survey and feature particle analysis.On this foundation,computational fluid dynamics was used in the simulation study,and the effects of AC and DC electric fields were taken into consideration to track the trajectory of contaminated particles in a motion cycle.Then the unitary pollution characteristics of insulator can be determined from the weighted average tracking results of sample particles with single particle size and charge amount.The simulation results show that the pollution amount of insulator surface is a comprehensive result of the influence of electric field strength,wind speed and feature particle size of the contaminated particles,and there are significant differences in the sensitivity of contamination to the electric field intensity under different environmental conditions.