南方电网技术2024，Vol.18Issue(5)：1-11,11.DOI:10.13648/j.cnki.issn1674-0629.2024.05.001
有载分接开关绝缘油中金属颗粒运动规律及其对介电性能的影响
Movement Law of Metal Particles in Insulating Oil of On-Load Tap-Changer and Its Influence on Dielectric Properties
摘要
Abstract
More than half of the defects caused by metal particle discharge in the oil chamber of high-voltage on-load tap-changer seri-ously affect long-term operational reliability.The movement law of metal particles in insulating oil during the disconnection process of on-load tap-changers and its impact on the dielectric properties of insulating oil are investigated,which can provide a theoretical basis for the diagnosis of insulation status of on-load tap-changers and the design of oil gap insulation margin.Firstly,theoretical analyses of fluid field,metal particle dynamics,and electric field are presented,and the coupling relationship among the three is explained.At the same time,a two-dimensional simplified simulation model of the on-load tap-changer contact is established,and the distribution of eddy currents in the fluid field,the movement law of metal particles,and the movement trajectory of charged metal particles are obtained.The simulation results show that during the on-load tap-changer movement,the particle concentration at the center of the on-load tap-changer gap is the highest,and a"small bridge"is formed.The influence of changes in metal particle concentration distribution on the dielectric properties of insulating oil is calculated using the dielectric constant and conductivity models of the mixture.A method of calculating according to concentration zones and then paralleling is proposed to improve the ac-curacy of dielectric parameter calculation.关键词
有载分接开关/金属颗粒/运动规律/介电性能Key words
on-load tap-changer/metal particles/movement law/dielectric properties分类
信息技术与安全科学引用本文复制引用
鲁沛乐,严英杰,刘亚东,江秀臣..有载分接开关绝缘油中金属颗粒运动规律及其对介电性能的影响[J].南方电网技术,2024,18(5):1-11,11.基金项目
国家自然科学基金青年科学基金资助项目"冲击油流与交变电场复合作用下特高压有载分接开关油室金属微粒运动特性及击穿机理研究"(52207166). Supported by the National Natural Science Foundation Youth Science Fund of China(52207166). （52207166）
