摘要
地壳运动、地沉降等因素会引起杆塔地基发生变化,严重影响输电线路运行的安全性。文章以地基沉降下某500 kV危塔为研究对象,建立精细塔—线系统有限元模型,通过仿真模拟实际地基沉降工况下杆塔应力分布情况,确定沉降杆塔上的薄弱构件并安装应变监测系统。结合多种工况下有限元仿真结果,验证了仿真结果的可靠性,获得杆塔临界失效情况下对应的测点应变变化裕度,根据系统实时监测结果对杆塔失效进行预警。结合工程实际应用,对判断地基沉降工况下杆塔的稳定性具有一定的指导作用。
Factors such as crustal movement and land subsidence will cause changes in the tower foundation,which seriously affect the safety of transmission line operation.Taking a 500 kV dangerous tower as an example,this paper establishes a precise tower-line system which is based on finite element model.By simulating the stress distribution of the tower in actual foundation settlement,it can determine the weak components of the settlement tower,and install the strain monitoring system.Combined with the finite element simulation results in various conditions,the reliability of simulation results is verified,and the range of strain variation of the corresponding measuring point is obtained in case of critical failure of tower.And the failure of the tower can be predicted in real time according to the monitoring results of system.Combined with the actual engineering application,it has a certain guiding role in judging the stability of the tower under the land subsidence conditions.
作者
甘艳
周文峰
杜志叶
邹建明
张力
Gan Yan;Zhou Wenfeng;Du Zhiye;Zou Jianming;Zhang Li(Central China Branch of State Grid Corporation of China,Wuhan 430077,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)
出处
《电测与仪表》
北大核心
2019年第20期9-16,共8页
Electrical Measurement & Instrumentation
基金
国家电网公司华中分部科技资助项目(SGHZ0000AJQT1800181)
关键词
有限元
塔-线系统
地基沉降
应变监测
失效预警
FEM
tower-line system
land subsidence
strain monitoring
failure warning
作者简介
甘艳(1976—),女,教授级高级工程师,博士,研究方向为智能电网输变电设备在线监测理论与关键技术。Email:gany@cc.sgcc.com.cn;周文峰(1995—),男,硕士研究生,研究方向为输电线路在线监测与故障诊断。Email:790406105@qq.com;杜志叶(1974—),男,博士,教授,博士生导师,研究方向为电网故障与安全、电磁场数值仿真等。Email:2435321@qq.com;邹建明(1966—),男,博士,教授级高级工程师,研究方向为电网安全与故障诊断。Email:zoujm@cc.sgcc.com.cn;张力(1994—),男,博士研究生,研究方向为输电线路风险评估和电工装备多物理场数值计算。Email:756970523@qq.com。
