750 kV同塔双回输电线路感应电压和电流的研究  

Study on the Induced Voltage and Current on the 750 kV Double Circuit Transmission Line on the Same Tower

作　　者：史志强[1] 邹德华[2] 俞乾[3] 杨雅倩 郭天伟[1] 李稳[2] 罗日成[1] SHI Zhiqiang;ZOU Dehua;YU Qian;YANG Yaqian;GUO Tianwei;LI Wen;LUO Richeng(School of Electrical and Information Engineering,Changsha University of Science ＆ Technology,Changsha 410004,China;Live Working Center of Huan Electric Power Company,Changsha 410100,China;Yongzhou Electric Power Bureau,Hunan Electric Power Company,Hunan Yongzhou 425000,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]国家电网湖南省电力公司带电作业中心,长沙410100 [3]湖南省电力公司永州电业局,湖南永州425000

出　　处：《高压电器》2018年第8期120-126,132,共8页High Voltage Apparatus

基　　金：国家自然科学基金资助课题(50977003);电力与交通安全监控及节能技术教育部工程研究中心基金(2010#03)~~

摘　　要：同塔多回超/特高压输电线路因其相间距和回间距小而存在较大的感应电压、电流,直接影响线路的检修、运行和接地开关设备的选型。为此,文中以兰州东至乾县的750 kV同塔双回输电线路为例,利用ATP/EMPT电磁暂态仿真软件搭建同塔双回输电线路模型,分析了两回线路之间的水平间距、运行线路长度、地线高度、土壤电阻率以及运行电流对检修线路上产生的感应电压和感应电流的影响,给出了各种典型工况下流过检修人员的人体电流大小。结果表明:检修线路上产生的感应电压、电流与水平间距基本成反比例关系,运行线路的长度对检修线路上产生的电磁感应电压和静电感应电流的幅值影响显著,地线高度对静电感应电压与电磁感应电压、电流影响较大,土壤电阻率对检修线路上产生的感应电压和电流的影响可以忽略不计,运行电流对电磁感应电压和电磁感应电流的影响显著。当在检修位置两侧挂接接地线时,流过检修人员的电流可达到毫安级,不能完全保障工作人员的安全,应在检修点再悬挂一条安保线,流过人体的电流将降低到微安级,能够确保带电检修人员的安全。The EHV/UHV transmission lines on the same tower have high induced voltage and current due to the small spacing and short distance,which will directly affect the line maintenance,operation and selection of grounding switch equipment. Taking the 750 kV double circuit transmission line on the same tower from Lanzhou east to Qianxian as an example,we use ATP/EMPT electromagnetic transient simulation software to build the model of double circuit transmission line on the same tower and then analyze the effects of horizontal spacing between transmission lines,length of the running line,height of the grounding wire,soil resistivity and operating current on the induced voltage and current on the maintenance line and get the current sizes through the maintenance staff under various typical working conditions. The results show that： the induction voltage and the induced current on the maintenance line are inversely proportional to the horizontal spacing;length of the running line has a significant influence on the electromagnetic induction voltage and the static induction current on the maintenance line;height of the grounding wire has great influence on static induction voltage and electromagnetic induction component;the effect of soil resistivity on the induced voltage and current on the maintenance line can be neglected;the operating current impacts the electromagnetic induction voltage and the electromagnetic induction current significantly. When the grounding wires are connected to both sides of the maintenance position,the current through the maintenance personnel can reach to the grade of m A,and the safety of the personnel can not be fully guaranteed,so a security line needs to be added in the maintenance point to lower the current flowing through the human body to the microampere level and ensure the safety of the maintenance personnel.

关 键 词：同塔双回 水平间距 运行线路长度 地线高度 土壤电阻率 运行电流 接地线 

分 类 号：TM75[电气工程—电力系统及自动化]