特高压输电线路杆塔基础独立接地性能仿真分析  

Independent Ground Performance Simulation Analysis of UHV Transmission Line Tower Footings

作　　者：童雪芳[1] 董晓辉[1] 谷定燮[1] 

机构地区：[1]中国电力科学研究院,武汉430074

出　　处：《高电压技术》2012年第12期3323-3330,共8页High Voltage Engineering

基　　金：国家电网公司科技项目(EPRIGYKJ[2012]4747)~~

摘　　要：为掌握特高压输电线路杆塔基础的独立接地性能,指导特高压杆塔接地优化设计,对特高压杆塔典型基础和人工接地装置的结构进行了调研,采用CDEGS接地分析软件仿真计算了各类基础的自然接地电阻,分析了各种影响因素的作用,比较了典型接地装置的降阻效果,模拟了有无接地装置情况下杆塔附近的电位水平和分布特征。结果表明,土壤电阻率<1 000Ω.m时,大部分类型杆塔基础的自然接地电阻可以满足设计要求;土壤电阻率>1 500Ω.m时,一般杆塔基础的自然接地电阻难以满足要求,应加装人工接地装置甚至辅助降阻措施。加装人工接地装置具有减小最大地电位升和均匀周边电位的作用,仅有杆塔基础散流时,只有当土壤电阻率在数十Ω.m以下时才能满足接触电势的要求。采用现场测量结果对比了仿真计算的误差,结果表明仿真建模的方法是有效的,计算偏差在工程允许范围内。In order to master the independent grounding performance of the UHV transmission line tower footings, guiding the UHV transmission line grounding design, we investigated the typical structure of UHV tower footings and artificial grounding devices, calculated grounding resistance of various tower footings based on CDEGS, and analyzed various factors. The reduction in resistance of the grounding devices was compared, and potential level and distribution characteristics around the tower in the presence and absence of the grounding devices were simulated. The results show that, most types of tower footings meet the requirements of resistance design when soil resistivity is less than 1 000 Ω·m, most grounding footings cannot meet the requirements of resistance design and need artificial grounding devices or secondary resistance reduction measures when soil resistivity is larger. Artificial grounding devices reduce the max potential rise and the surrounding potential difference. The potential distribution with tower footings cannot meet the touch voltage goal expect the soil resistivity is very small. The simulated error are analyzed by comparing with field measurements, the results show that the modeling method is effective and the simulation deviation is within the allowable range.

关 键 词：特高压(UHV) 输电线路 杆塔基础 接地电阻 电位分布 接触电势 现场测量 

分 类 号：TM754[电气工程—电力系统及自动化]