高电压技术2024，Vol.50Issue(5)：2225-2236,12.DOI:10.13336/j.1003-6520.hve.20230682
基于离散元方法的复合绝缘子表面污秽沉积模型
Contamination Deposition Model of Composite Insulator Surface Based on Discrete Element Analysis Method
摘要
Abstract
The deposition of contamination particles on the composite insulators surface affects the electrical characteris-tics of insulators,resulting in surface discharge and even pollution flashover.Thus,exploring the deposition mechanism from a microscopic perspective can provide a theoretical basis for the stable operation of the power system.Based on the JKR contact mechanics theory,this study analyzes the force in the process of particle collision by the traditional Newton mechanics method and discrete element analysis method,respectively,and a collision deposition model that integrates normal collision and particle rebound velocity is proposed.Simulation experiments are carried out according to different collision deposition models,and the results are compared with the existing experimental results.The results show that the collision deposition model obtained by the discrete element analysis method is more accurate in predicting the deposition of SiO2 particles on the surface of composite insulators compared with the Newtonian mechanics method.The particle deposition number on the insulator surface tends to increase first and then decrease with the increase of particle size and reaches the maximum at the particle size of 20 μm.When the wind direction is changed,the ratio of NSDD between the medium voltage end and high voltage end of the insulator string will decrease with the increasing wind angle,and the ra-tio of NSDD between the lower surface and upper surface will decrease with the increasing angle.The particle deposition number on the insulator surface tends to increase first and then decrease with the increase of wind speed and reaches the maximum at±30º.The model can more accurately describe the deposition process of pollution particles on the insulator surface,and the research results can help to improve the mechanism of pollution deposition on the composite insulator surface.关键词
复合绝缘子/污秽颗粒/离散元方法/碰撞沉积/模型对比Key words
composite insulator/contamination particles/discrete element analysis method/collision deposition/model comparison引用本文复制引用
刘冬雄,杨忠毅,曾祥君,汤涛,范必双,范才进..基于离散元方法的复合绝缘子表面污秽沉积模型[J].高电压技术,2024,50(5):2225-2236,12.基金项目
国家重点研发计划(2022YFB3206800) （2022YFB3206800）
国家自然科学基金(52277077) （52277077）
湖南省自然科学基金(2021JJ40604).Project supported by National Key R&D Program of China(2022YFB3206800),National Natural Science Foundation of China(52277077),Natural Science Foundation of Hunan Province(2021JJ40604). （2021JJ40604）
