摘要
2023年12月18日积石山地震震害发现750 kV避雷器遭受破坏。为了提升变电站既有750 kV避雷器的抗震性能,提出选取中间层为隔震部位进行抗震改造。提出钢丝绳阻尼器及复合隔震支座2种中间层隔震方案,建立原避雷器及隔震结构ABAQUS有限元模型,三向输入10组地震波进行有限元分析,提取各结构套管根部应力、顶部加速度及位移响应,对比分析中间层隔震效率。结果表明:地震作用下,钢丝绳阻尼器中间层隔震结构能有效降低避雷器套管根部应力及顶部加速度,但对顶部位移放大作用过大,易造成导线牵拉破坏;复合隔震支座的中间层隔震方案能够提升中间层结构竖向刚度,使原结构套管根部应力及顶部加速度峰值下降幅度均超40%,同时控制顶部位移峰值仅提升12.56%,达到良好的隔震效果;带有复合隔震支座的中间层隔震装置具有较好的隔震效率,是提升既有750 kV避雷器抗震性能的有效改造措施。
On December 18,2023,the Jishi mountain earthquake revealed damage to 750 kV surge arresters.In order to improve the seismic performance of existing pillar-type electrical equipment in substations,the intermediate layer was selected as the isolation part for modification.Two intermediate isolation schemes were proposed:steel wire rope damper and composite seismic isolation bearing.The original surge arrester and isolation structure were modeled using the ABAQUS finite element method.Ten sets of seismic waves were input for finite element analysis,and the stress of bushing root,top acceleration and displacement responses of each structure were extracted to compare and analyze the isolation efficiency of the intermediate layer.The results show that under seismic action,the intermediate isolation structure of the steel wire rope damper can effectively reduce the stress of bushing root and top acceleration of the surge arrester,but it has a significant amplifying effect on the top displacement,which can easily cause wire tension damage.The intermediate isolation scheme with composite seismic isolation bearing can improve the vertical stiffness of the intermediate layer structure,so that the root stress and top acceleration of the original structure bushing decrease by more than 40%,and the peak displacement of the top is only increased by 12.56%,so as to achieve a good seismic isolation effect.The intermediate isolation device with composite seismic isolation bearings exhibits good seismic isolation efficiency and is an effective retrofit measure to improve the seismic performance of existing 750 kV surge arrester.
作者
熊超诣
刘匀
石高扬
谢强
XIONG Chaoyi;LIU Yun;SHI Gaoyang;XIE Qiang(College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《地震工程与工程振动》
北大核心
2025年第4期30-39,共10页
Earthquake Engineering and Engineering Dynamics
基金
国家重点研发计划项目(2022YFF0608904)
国家自然科学基金项目(51878508)。
关键词
既有结构
避雷器
隔震改造
地震响应控制
existing structure
surge arrester
seismic isolation retrofit
seismic response control
