基于杆塔耐雷水平的冲击接地阻抗控制值计算研究  

Calculation of Impulse Grounding Impedance Control Value Based on Lightning Withstand Level

作　　者：刘凡 汤亮亮 雷潇 徐霞[2,3] 陈辉荣 刘刚 吴敏[2,3] LIU Fan;TANG Liangliang;LEI Xiao;XU Xia;CHEN Huirong;LIU Gang;WU Min(State Grid Sichuan Electric Power Research Institute,Chengdu 610041,China;Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 430074,China;Hubei Key Laboratory of Power Grid Lightning Risk Prevention,Wuhan 430074,China)

机构地区：[1]国网四川省电力公司电力科学研究院,成都610041 [2]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [3]电网雷击风险预防湖北省重点实验室,武汉430074

出　　处：《电瓷避雷器》2023年第4期70-76,83,共8页Insulators and Surge Arresters

基　　金：国家电网有限公司总部管理科技项目(编号:5500-202126130A-0-0-00)。

摘　　要：输电线路杆塔冲击接地阻抗作为影响输电线路耐雷水平的重要因素,在杆塔的接地设计以及状态评估方面应该重点考虑,因此需要提出杆塔冲击接地阻抗控制值。通过建立110 kV、220 kV、500 kV的输电线路模型,计算了不同冲击接地阻抗情况下输电线路的耐雷水平,并基于我国对各电压等级输电线路雷击跳闸率的要求,计算得到各电压等级输电线路杆塔冲击接地阻抗控制值,可为输电线路杆塔的运行维护和状态评估提供参考。同时计算了典型方框带射线杆塔接地体在不同土壤电阻率下满足冲击接地阻抗控制值的最小射线长度,避免了仅凭经验估算造成的施工材料浪费,为实际工程建设提供了参考数据。As an important factor affecting the lightning withstand level of transmission line,the impulse grounding impedance of transmission line tower should be considered in the grounding design and state evaluation of tower.Therefore,it is necessary to put forward the control value of impulse grounding impedance of tower.Through the establishment of 110 kV,220 kV,500 kV transmission line models,the lightning withstand level of transmission lines under different impulse grounding impedance is calculated.Based on the requirements of lightning trip-out rate of transmission lines of various voltage levels in China,the control value of impulse grounding impedance of transmission line towers at different voltage levels is calculated,which can provide reference for the operation,maintenance and state evaluation of transmission line towers.At the same time,the minimum amount of steel applied to meet the control value of impulse grounding impedance for typical square tower grounding body under different soil resistivity is calculated,which avoids the waste of construction materials caused by empirical estimation and provides reference data for practical engineering construction.

关 键 词：耐雷水平 冲击接地阻抗 状态评估 接地装置设计 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM75