摘要
变压器是变电站的重要设备,具有较高的地震易损性。为评估变压器侧壁套管的抗震性能,建立了变压器-套管体系简化计算理论模型,并通过一台220 kV变压器-套管体系振动台试验结果加以验证。分析了侧壁L形升高座根部法兰连接处箱体侧壁的面外摆动效应对套管地震响应的影响,并通过参数分析探讨了其地震响应机理。结果表明:箱体侧壁的摆动效应是侧壁L形升高座顶部加速度放大的主要原因;升高座根部箱体侧壁面外转动刚度以及升高座高长比对该种摆动效应有十分显著的影响。因此,应合理设计变压器箱体侧壁的面外刚度和L形升高座的高长比,降低摆动效应对套管地震响应的影响。
Transformers are important substation equipment with relatively high seismic vulnerability.In order to evaluate seismic performance of transformers,a theoretical model of transformer-bushing system was established and verified with shaking table tests based on a 220kV transformer model.The main objective of the study was to investigate the influence of the rocking effects of the lateral wall on seismic responses of bushing.Further,it was assessed through parameter analyses.Results show that the rocking effects are the main cause of acceleration amplification at the top of L-shaped elevated seat,and the stiffness of the lateral wall at the bottom of the elevated seat and the height-length ratio of elevated seat both have significant effects on the rocking effects.Thus,the out-of-plane stiffness of the lateral wall of the tank and the height-length ratio of the L-shaped elevated seat should be reasonably designed to reduce the influence of the rocking effects on the seismic response of the bushing.
作者
陈星
谢强
李晓璇
刘匀
CHEN Xing;XIE Qiang;LI Xiaoxuan;LIU Yun(College of Civil Engineering,Tongji University,Yangpu District,Shanghai 200092,China;Key Laboratory of Performance Evolution and Control for Engineering Structures(Tongji University),Ministry of Education,Yangpu District,Shanghai 200092,China)
出处
《电网技术》
EI
CSCD
北大核心
2020年第1期114-121,共8页
Power System Technology
基金
国家重点研发计划项目(2018YFC0809400)
国家自然科学基金项目(51878508)~~
关键词
变压器-套管
理论模型
摆动效应
地震响应
振动台试验
参数分析
transformer-bushing
theoretical modelling
rocking effects
seismic responses
shaking table test
parameter analysis
