平板电极下微米级粉尘弥散浓度探测方法与时空演化特性分析  

Detection Method and Spatial-Temporal Evolution Characteristics Analysis of Micron Dust Dispersion Concentration under Flat Electrodes

作　　者：薛乃凡 魏来 李庆民 王媛 杨睿成 Xue Naifan;Wei Lai;Li Qingmin;Wang Yuan;Yang Ruicheng(Beijing Key Lab of HV and EMC North China Electric Power University,Beijing 102206,China;State Key Lab of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University,Beijing 102206 China Elect)

机构地区：[1]北京市高电压与电磁兼容重点实验室(华北电力大学),北京102206 [2]新能源电力系统全国重点实验室(华北电力大学),北京102206

出　　处：《电工技术学报》2024年第7期2132-2142,共11页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划(2021YFB2601404);国家自然科学基金(52127812,51929701)资助项目。

摘　　要：气体绝缘全封闭组合电器/气体绝缘金属封闭输电线路(GIS/GIL)在生产、运行和维护过程中会不可避免地产生微米级粉尘,可能是诱发工程现场不明放电的根本原因。为检测微米级粉尘弥散浓度并研究浓度的时空演化特性,该文分析了10000目、2000目和1000目粉尘的光散射特性,在此基础上设计并搭建了基于平板电极的粉尘浓度探测平台,实现了粉尘弥散浓度的定量探测。通过实验研究,获得了在升压过程和持续加压下,不同粒径、不同初始质量微米级粉尘的弥散浓度演化规律。研究表明,随着电压作用时间的增加,粉尘浓度快速出现最大值,然后逐渐下降。微米级粉尘弥散浓度在升压过程中会出现峰值现象,当粉尘粒径减小或初始质量增大时,均出现更大的浓度峰值。在粉尘运动过程中,存在团聚启举的特殊现象,造成严重的电场畸变,威胁气隙绝缘安全。该文结果阐释了微米级金属粉尘弥散浓度的时空演化规律,可为GIS/GIL等电气设备中微米级金属污染物的监测和危险程度评估提供支撑。In the process of GIS/GIL production,operation and maintenance,multi-scale dust is inevitably generated due to mechanical vibration,switch contact friction and man-made pollution.And micron level dust is an important part of pollutants,which may be the root cause of unknown discharge in the engineering site.For metal particles with millimeter and sub-millimeter particle sizes,the degree of harm is large and the fault characteristics are obvious.Faults caused can be identified and warned by existing detection methods such as camera photography and ultra-high frequency method.However,for micron level dust,the particle size is small and the fault characteristics are weak.The above detection method is difficult to collect the characteristic information of micron level dust.However,dust with the high physical and chemical activity gradually accumulates under the long-term operation of the equipment,which may induce serious discharge failure of the insulator and endanger the safe operation of the equipment.Therefore,it is necessary to study the detection method of micron level dust and the temporal-spatial evolution law of concentration.Firstly,the light scattering characteristics of 10000,2000 and 1000 mesh dust were analyzed,and the scattered light intensity distribution of dust was obtained.On this basis,a dust concentration detection platform based on plate electrode is designed and built by using the principle of light scattering.Therefore the quantitative detection of dust dispersion concentration is realized.Secondly,this paper carried out an experimental study on the temporal and spatial evolution of dust concentration,and analyzed the variation characteristics of concentration under different pressurization methods,pressurization time,dust particle size and initial dust mass.Finally,during the experiment,it was found that there was a special phenomenon of‘agglomeration lifting’when the dust dispersed between the plate electrodes.The feasibility of the light scattering method to detect the concentration was

关 键 词：微米级粉尘 光散射法 浓度检测 弥散特性 时空演化 

分 类 号：TM852[电气工程—高电压与绝缘技术]