±800kV直流输电线路正极性侧带电作业电位转移放电特性研究  

Study on Discharge Characteristics of Potential Transfer of Live Working on the Positive Polar Side of±800kV DC Transmission Line

作　　者：周晨梦 罗日成[1] 李稳 李智琦 史志强[1] 隆晨海 郑云龙 杨鑫[1] ZHOU Chenmeng;LUO Richeng;LI Wen;LI Zhiqi;SHI Zhiqiang;LONG Chenhai;ZHENG Yunlong;YANG Xin(School of Electrical and information Engineering,Changsha University of Science&Technology,Changsha 410004,China;Maintenance Company of State Grid Hunan Electric Power Company,Changsha 410018,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410004 [2]国网湖南省电力有限公司检修公司,长沙410018

出　　处：《电瓷避雷器》2020年第2期15-19,25,共6页Insulators and Surge Arresters

基　　金：国家自然科学基金青年基金项目(编号:51407013);湖南省教育厅科学研究项目(编号:15C0031)。

摘　　要：为明确±800 kV直流输电线路带电作业电位转移放电特性,考虑强电场作用下粒子产生、运动和消散过程,构建了基于流体力学理论的电位转移流注放电模型,计算并分析了放电过程中的电场强度、流注发展速度和电流密度随时间的变化规律,以及不同转移距离下的放电电流。结果表明:在电位转移放电过程中,随着放电时间的增加,流注头部电场强度减小、流注发展速度加快、电流密度增大;电位转移棒与导线间的放电电流随着电位转移距离的减小而增大;确定了±800 kV输电线路在正极性导线侧带电作业时最佳电位转移距离为0.45 m左右。In order to clarify the discharge characteristics of potential transfer of live working on±800 kV DC transmission lines,considering the particle generation,motion and dissipation process under the action of strong electric field,a potential transfer streamer discharge model based on the theory of hydrodynamics is established.The electric field intensity,the developing speed of streamer and the current density change with time are calculated and analyzed,and the discharge current under different transfer distance is also calculated and analyzed.The results show that with the increase of the discharge time,the electric field intensity of the head of the streamer decreases during the process of discharge of potential transfer;the speed of the streamer development increases and current density increases.The discharge current between the potential transfer rod and the wire will increase as the potential transfer distance decreases.The optimum potential transfer distance is about 0.45 m when the live working on the positive polar side of±800 kV transmission line.

关 键 词：±800 KV 带电作业 电位转移 流注放电 放电电流 

分 类 号：TM84[电气工程—高电压与绝缘技术] TM721.1