直流套管中自由金属微粒运动特性分析  

Motion Characteristics Analysis of Free Metal Particles in DC Bushing

作　　者：李松 李金忠 汤浩 邓江 LI Song;LI Jinzhong;TANG Hao;DENG Jiang(China Electric Power Research Institute,Beijing 100192,China;State Grid Corporation of China,Beijing 100031,China;Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]国家电网有限公司,北京100031 [3]西南交通大学,成都611756

出　　处：《高压电器》2021年第6期162-170,共9页High Voltage Apparatus

基　　金：国家电网公司科技项目(GY71⁃18⁃022)。

摘　　要：近年来在多起直流套管故障中,均在套管内部发现直径分布在数微米至数十微米间的金属微粒,金属微粒在套管内部附着与运动对套管内部电场分布及套管的安全稳定运行具有重要的影响。对故障套管内部存在的金属微粒分布位置与形态进行了分析,并建立了不同尺寸、不同分布模式下自由金属微粒的运动模型,用于计算微粒的起始运动场强。搭建微粒试验平台,结合套管实际运行状态分析微粒运动特性,对微粒运动模型进行验证。结果表明,直流套管内自由金属微粒将在电场作用下发生运动,且起始运动场强与微粒直径、微粒分布宽度、微粒分布厚度等因素密切相关。研究结果可用于直流套管的结构优化设计,在学术与工程应用上均值得进一步研究。In several DC bushing failures in recent years,metal particles have been found inside the bushing,and the diameter was between several microns and several tens of microns.The adhesion and movement of metal particles inside the bushing had impact on the electric field distribution and safely operating.In order to calculate the initial motion field strength of particle,the position and shape of metal particles inside the fault bushing were analyzed,and the motion model of free metal particles with different sizes and forms were established.A test platform was built.The particle motion characteristics were analyzed according to the operating bushing,and the particle motion model was verified.The results showed that free metal particles in the DC bushing would move under the influence of the electric field.The initial motion field strength was related to factors such as particle diameter,width,and thickness.The research result could be used as structural optimization and design of DC bushings,which was worth a further study both in academic and engineering application.

关 键 词：直流套管 微米级自由金属微粒 模型构建 起始运动场强 

分 类 号：TM216.5[一般工业技术—材料科学与工程]