沙尘环境下绝缘子表面颗粒积聚特性研究
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摘要
为研究沙尘环境下绝缘子表面颗粒积聚特性,基于流体力学和电场分布理论建立多物理场共同作用下的风洞仿真模型,应用有限元法分析计算绝缘子表面颗粒在不同沙尘环境下的绝缘子表面压强和沙尘积聚量。研究结果表明:风速、电势和沙尘粒径均与绝缘子表面颗粒积聚特性有关,风速、电势和沙尘粒径3个变量中任意一个增加,沙尘颗粒碰撞迎风面和背风面产生的压强均会增加且迎风面压强比背风面高;沙尘积聚量随风速增加而快速增加且积聚速度逐渐减缓并趋于平稳,随电势增加而增加且积聚速度比较缓慢,随沙尘粒径增加而缓慢增加并逐渐趋于饱和且积聚速度逐渐减缓。仿真结果与试验结果基本相符。
In order to study particulate accumulation characteristics of insulator with sheds under sandstorm environment, the wind tunnel simulation model of multiple physical fields was established based on the theory of fluid mechanics and electric field. The finite element method was utilized to analyze insulator sheds pressure and particulate accumulation amount in different sandstorm environments. The results show that wind speed, electrical potential and particle size are related to particulate accumulation characteristics of the insulator. When any of wind speed, electrical potential and particle size increases, particles collide will increase the pressure on the windward and leeward sheds, and windard pressure is higher than the leeward pressure. The amount of particulate accumulation increases rapidly with the increase of wind speed and the accumulation rate gradually slows down and stabilizes. More specifically, with the increase of electric potential, the accumulation amount increases rapidly while the speed of accumulation slows down and gradually stabilizes; with the increase of particle size, the accumulation amount slowly increases and tends to be saturated. The simulation results agree well with the experimental results.
In order to study particulate accumulation characteristics of insulator with sheds under sandstorm environment, the wind tunnel simulation model of multiple physical fields was established based on the theory of fluid mechanics and electric field. The finite element method was utilized to analyze insulator sheds pressure and particulate accumulation amount in different sandstorm environments. The results show that wind speed, electrical potential and particle size are related to particulate accumulation characteristics of the insulator. When any of wind speed, electrical potential and particle size increases, particles collide will increase the pressure on the windward and leeward sheds, and windard pressure is higher than the leeward pressure. The amount of particulate accumulation increases rapidly with the increase of wind speed and the accumulation rate gradually slows down and stabilizes. More specifically, with the increase of electric potential, the accumulation amount increases rapidly while the speed of accumulation slows down and gradually stabilizes; with the increase of particle size, the accumulation amount slowly increases and tends to be saturated. The simulation results agree well with the experimental results.
引文
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[2]WANG X,CHEN J,SUN J,et al.Severe haze episodes and seriously polluted fog water in Ji’nan,China[J].Science of the Total Environment,2014,493(493):133-137.
[3]GAO Y,CHENG H,ZHU J,et al.The optimal dispatch of a power system containing virtual power plants under fog and haze weather[J].Sustainability,2016,8(1):7101-7122.
[4]ZHANG Z,YOU J,WEI D,et al.Investigations on AC pollution flashover performance of insulator string under different nonuniform pollution conditions[J].IET Generation Transmission&Distribution,2016,10(2):437-443.
[5]JIANG X,DONG B,ZHANG Z,et al.Effect of shed configuration on DC flashover performance of icecovered110 k V composite insulators[J].Dielectrics&Electrical Insulation IEEE Transactions,2013,20(3):699-705.
[6]Ravelonmanantsoa N,Farzaneh M,Chisholm W A.Simulation method for winter pollution contamination of HV insulators[C]//Properties and Applications of Dielectric Materials 2011 EIC Conference,Sydney:EIC,2011:373-376.
[7]宿志一,范建斌,谷琛,等.高压直流换流站污秽水平预测方法研究[J].中国电机工程学报,2007,13(27):1-5.SU Zhiyi,FAN Jianbin,GU Chen,et al.The research of pollution level prediction method of hvdc converter stations[J].Proceedings of the CSEE,2007,13(27):1-5.
[8]刘佳.兰州市大气降尘粒度分布特征与来源研究[D].兰州:兰州大学,2012.LIU Jia.Study on the source and characteristics of grain size distribution of atmospheric dust fall in Lanzhou[D].Lanzhou:Lanzhou University,2012.
[9]毕晓甜.高压直流输电线路绝缘子积污特性试验与仿真研究[D].济南:山东大学,2016.BI Xiaotian.Research on test and simulation of contamination characteristics of HVDC transmission line insulators[D].Jinan:Shandong University,2016.
[10]张志劲,李星,舒生前,等.XWP2–70双伞型绝缘子表面污秽颗粒积聚特性[J].高电压技术,2014,11(40):3327-3335.ZHANG Zhijin,LI Xing,SHU Shengqian,et al.Characteristics of natural pollution accumulation of XWP2–70 Insulators with double sheds[J].High Voltage Engineering,2014,11(40):3327-3335.
[11]蒋兴良,李海波.计算流体力学在绝缘子积污特性分析中的应用[J].高电压技术,2010,2(36):329-334.JIANG Xingliang,LI Haibo.Application of computational fluid dynamics to analysis of contamination depositing characteristics of insulators[J].High Voltage Engineering,2010,2(36):329-334.
[12]王黎明,刘霆,梅红伟,等.基于计算流体力学的支柱绝缘子积污特性研究[J].高电压技术,2015,8(41):2741-2749.WANG Liming,LIU Ting,MEI Hongwei,et al.Research on contamination deposition characteristics of post insulator based on computational fluid dynamics[J].High Voltage Engineering,2015,8(41):2741-2749.
[13]王晶,陈林华,刘宇,等.电场对复合绝缘子积污特性影响的探究[J].高电压技术,2011,3(37):585-593.WANG Jing,CHEN Linhua,LIU Yu,et al.Effect of the electric field on the contamination accumulation characteristic of the insulators[J].High Voltage Engineering,2011,3(37):585-593.
[14]李恒真,赖江宇,雷乾,等.污秽颗粒在绝缘表面的碰撞和吸附[J].高电压技术,2012,10(38):2596-2603.LI Hengzhen,LAI Jiangyu,LEI Qian,et al.Collision and adsorption of pollution particles on the surface of electrical insulator[J].High Voltage Engineering,2012,10(38):2596-2603.