摘要
输电线路绝缘子污秽闪络事故影响电力系统的稳定运行,虽然采取了不同程度的防污闪措施,但是污闪事故时有发生。为掌握绝缘子的积污规律,从而指导输电线路外绝缘的防污工作,有必要对绝缘子的积污特性进行研究。采用欧拉两相流法建立了绝缘子积污仿真模型,计算了绝缘子表面的静压以及绝缘子周围流场速度矢量。通过数值仿真研究了绝缘子表面的污秽分布,及其受风速的影响情况,然后开展了以真型绝缘子为对象的风洞积污试验。研究表明,绝缘子表面静压以及绝缘子周围的流场状态影响污秽颗粒在绝缘子表面的集聚情况;污秽在绝缘子表面呈现不均匀分布;风速对绝缘子表面积污影响显著,绝缘子表面不同部位的积污随风速的变化有不同的变化规律;风洞试验的结果为仿真分析的合理性提供了良好的佐证。
Flashover accidents caused by contaminated insulators may affect stable operation of power system.Pollution flashover accidents still occur while many anti-pollution flashover measures are taken.In order to understand contamination rules and guide anti-contamination work,it is necessary to study characteristics of pollutant deposition on insulators.Pollution simulation model based on Euler two-phase flow method was put forward in this paper,and static pressure and velocity vector field around insulator surface was calculated.Then pollution distribution in polluted insulator surface and influence of wind velocity were analysed.Finally,simulation results were verified with pollution test in wind tunnel.Researches show that static pressure and flow field state around insulator influence particle deposition on insulator surfaces.The pollution is not uniformly distributed on insulator surfaces and wind velocity is a mainly factor affecting pollution distribution.Contamination at different parts of insulator varies with change of wind velocity.Wind tunnel test results well prove rationality of simulation analysis results.
出处
《电网技术》
EI
CSCD
北大核心
2017年第11期3698-3704,共7页
Power System Technology
基金
国家电网公司科技项目资助(2016渝电科技35#
SGTY-HT/14-JS-188)~~
关键词
绝缘子
积污特性
欧拉两相流
风洞试验
insulator
contamination characteristics
Eulertwo-phase flow
wind tunnel test
