近远场地震下软导线耦联电气设备体系地震响应分析

Seismic Responses of Flexible Conductor Interconnected Electrical Equipment in Near and Far Field Earthquakes

为深入研究软导线耦联电气设备体系的抗震性能,文中将支柱类电气设备简化成梁,建立了安装在支架上的支柱类电气设备、分裂导线与导线连接的电气设备耦联体系有限元模型,分析了单体设备的地震响应与分裂导线连接的电气设备耦联体系地震响应的特征,并考虑了设备在近远场地震动下响应的区别与联系。之后对分裂导线的影响进行了参数分析。结果表明,相较于设备在单体时的地震响应,在两耦联设备动力特性差异较大的情况下,软导线将放大高频设备的地震响应,减小低频设备的地震响应。近场脉冲地震作用下,软导线对高频设备地震响应的放大作用更明显。在进行变电站抗震设计时,应考虑近场脉冲地震动脉冲段对设备抗震性能的影响。

Based on the reality that the flexible conductor coupling electrical equipment is extremely vulnerable in the past earthquake disasters,this paper simplified electrical equipment of the pillar⁃type and their supports into beams,and established the finite element models(FEM)of pillar⁃type electrical equipment fixed to the support,the flexible conductor and the flexible conductor interconnected electrical equipment.After that,this paper analyzes the seismic response of the statement of both individual equipment and the interconnected substation equipment,then considers the differences of the responses in the vibrations of near and far site.Besides,the parameters of the flexible conductor were changed to find out the rule of its influence.The result of this paper shows that it aggravates the seis⁃mic response of the high⁃frequency equipment and reduces the seismic response of the low⁃frequency equipment compared with the seismic response of individual equipment in the cases of large difference in dynamic characteris⁃tics of two coupling devices.Additionally,the earthquake of pulse⁃like in near site have a more amplifying effect on the seismic performance.In the seismic design of substations,it is recommended to consider the impact of near⁃field pulse ground motion’s pulse segments on the seismic performance of equipment.