导电混凝土杆塔基础的雷电流冲击损伤分析  

Lightning Current Impact Damage to Conductive Concrete Tower Foundation

作　　者：田旭 裴锋 刘欣 贾蕗路 兰芬 程宏波 TIAN Xu;PEI Feng;LIU Xin;JIA Lulu;LAN Fen;CHENG Hongbo(Electric Power Research Institute of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330096,China;School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,南昌330096 [2]华东交通大学电气与自动化工程学院,南昌330013

出　　处：《电瓷避雷器》2023年第3期52-59,共8页Insulators and Surge Arresters

基　　金：江西省重点研发计划项目(编号:20202BBEL53008);国网江西省电力有限公司科技项目(编号:52182018000T)。

摘　　要：导电混凝土基础在杆塔接地中具有很好的应用前景,为分析雷电流泄散对导电混凝土基础的损伤影响,分析了雷电流冲击时导电混凝土基础内部的电-热-损伤耦合过程,建立了导电混凝土基础的多物理场耦合仿真模型,分析了雷电流冲击下导电混凝土基础内部的应力场分布,据此得到形变位移场及应变场分布,根据应变场分布情况进行了损伤程度分析,并与常规的普通混凝土基础进行了对比。仿真结果表明:雷电流泄散时,导电混凝土基础主柱区域最易发生裂缝损伤,尤其在雷电流注入点附近损伤最为集中,基础台阶区域主筋两端较易发生损伤,基础底板区域主筋两端损伤次之,而基础内部其他区域损伤都较小。导电混凝土基础接地的散流效果较好、损伤程度小,有利于延迟使用寿命。The conductive concrete foundation has a good application prospect in the tower grounding.In order to analyze the damage effect of lightning current dispersion on conductive concrete foundation,the coupling process of electric-heat-damage in conductive concrete foundation under lightning current impact is analyzed,and the multi-physics coupling simulation model of conductive concrete foundation is established.The stress field distribution of conductive concrete foundation under lightning current impact is analyzed.Based on the stress field distribution inside the foundation,the deformation displacement field and the strain field distribution are obtained.According to the strain field distribution,the damage degree is analyzed and compared with the conventional ordinary concrete foundation.The simulation results show that when the lightning current dissipates,cracks are most likely to occur in the main column area of the conductive concrete foundation,especially near the lightning current injection point.The two ends of the main reinforcement in the step area of the foundation are more likely to be damaged,followed by the two ends of the main reinforcement in the base plate area,and the damage in other areas of the foundation is the least.The conductive concrete foundation grounding has a better dissipating effect and less damage,which is good for extending the service life.

关 键 词：导电混凝土基础 雷电冲击 形变位移场 应变场 损伤程度 

分 类 号：TM863[电气工程—高电压与绝缘技术]