高压直流输电环形电极埋深特性分析  

Analysis of the Burial Depths of the Annular Electrodes in HVDC System

作　　者：崔明德[1] 刘连光[1] 孙中明[2] 张冰[1] 马海忠[1] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,北京102206 [2]北京网联直流工程技术有限公司,北京100005

出　　处：《高电压技术》2007年第1期156-159,共4页High Voltage Engineering

摘　　要：为了优化赢流接地极的设计，以双圆环接地极为例，采用经典镜像法分析了电极在均匀和非均匀土壤中埋设深度变化对跨步电压、溢流密度和接地电阻等运行参数的影响；针对标准双环或三环电极，提出了一种同心非等深立体布置的设计思路。计算分析和仿真结果表明：1）电极埋深宜控制为2～4m，最大不应〉4m；2）水平分层土壤中，标准多环电极的内环埋深对于系统运行参数的影响不大，实际工程中采用非等深立体布置设计在技术上是可行的，且相对等深布置经济性更佳。In order to get the symmetrical current density, the concentric annular electrodes laid with the same depth are usually used in HVDC system as well as some level electrodes disposed symmetrically. So it brings forth a highgrade request about the technique and economical performance. To optimize the electrodes design, the dependence of the step voltage, release-current density and the earth resistance on the burial depth of double annular electrodes buried in uniform and nonhomogeneous soils are analyzed based on the image method. As for the normal double or triple ring-type electrodes, a three-dimensional design thought of the concentric rings with different burial depths is presented. Calculation and simulation results show that 1） the maximum burial depth of the electrodes is not more than 4m, and the depths should be controlled between 2m and 4m; 2） the position of the inner rings of the standard multiple rings has little influence on the running parameters, so it is feasible for the new design thought to apply in the practical projects, and it will get a better economical performance.

关 键 词：高压直流 接地极 溢流密度 同心环 埋深 优化 立体设计 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM757