基于有限元方法的山地输电杆塔接地特性分析  

Grounding characteristics analysis of transmission line towers in mountainous regions based on finite element method

作　　者：郑东方 陈亮 ZHENG Dongfang;CHEN Liang(Shangqiu Power Supply Company,State Grid He’nan Electric Power Co.,Ltd,Shangqiu,He’nan 476000)

机构地区：[1]国网河南省电力公司商丘供电公司,河南商丘476000

出　　处：《电气技术》2024年第8期47-52,共6页Electrical Engineering

摘　　要：为深入研究山地输电杆塔的接地特性,运用有限元方法对杆塔基础、接地体、土壤介质建模,分析不同接地参数、不同环境工况下的接地特性。结果表明:土壤电阻率和接地体长度对接地电阻有较大影响;接地体所处的土壤环境对接地电阻有较大影响,可考虑在接地体周边实施降阻措施;高频条件下,随着导体阻抗增大,高频电流沿导体传播难度增大,电流更易从电流注入点附近散流,工程中可考虑在电流入地点附近实施降阻措施。本文研究可为实际工程中地表电位测算和防雷、降阻设计提供参考。In order to conduct in-depth research on the grounding characteristics of transmission line towers in mountainous regions,finite element method(FEM)is used to model the tower foundation,grounding system,and soil medium in detail.The grounding characteristics under different grounding models and operating conditions are analyzed.The results show that,the soil resistivity and the length of the grounding conductor have a significant impact on the grounding resistance;the soil environment where the grounding conductor is located has a certain impact on the grounding resistance,and it can be considered to implement resistance reduction measures around the grounding conductor;under high-frequency conditions,as the impedance of the conductor increases,the difficulty of high-frequency current propagation along the conductor increases,making it easier for the current to dissipate near the current injection point.In engineering,resistance reduction measures can be considered near the current injection point.This study can provide reference for the calculation of surface potential and the design of lightning protection and resistance reduction in practical engineering.

关 键 词：有限元方法(FEM) 输电杆塔 接地特性 工频 高频 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM75