不同连接方式下直流场回路支柱绝缘子抗震性能研究

为对比全硬管母连接和分段管母组合六分裂导线连接两种连接方式对直流场回路抗震性能的影响,以某换流站直流场±400 kV回路为研究对象,建立了不同连接条件下该回路的精细化有限元模型,获得了回路支柱绝缘子的地震响应。对不同条件下回路中支柱绝缘子的地震响应进行了对比分析,发现绝缘子的位置和回路的连接方式对绝缘子地震响应有较大影响。进一步得到如下结论:该回路在地震作用下易发生整体扭转,回路两端绝缘子地震响应较中间绝缘子大;全硬管母连接方式下回路整体性好,地震响应可以较好的均分给各个支柱绝缘子,分段管母加六分裂导线连接的回路整体性略差,平行弱轴的回路部分中设备的地震响应有明显增大;非直线布置耦联体系中平行弱轴的回路部分中设备的地震响应较大。

Seismic Performance of Post Insulators in the Loop of DC Field Under Different Connection Modes

To compare the influences of two connection modes on the seismic performance of the loop in DC field,a±400 kV loop in a DC field in a converter substation is taken as the objective to establish a refined finite element model for analyzing its seismic performance.The seismic responses of the loop under different input ground motions are obtained.It is found that the location of insulator and the connection mode of loop have great influences on the seismic response of the insulators.It is concluded that the loop has an overall torsional effect under seismic action,and the dynamic responses of the insulators at both ends are larger.The integrity of the loop connecting with rigid tubular bus is better.The seismic response of the loop in rigid connection mode is more evenly distributed to each insulator than that inflexible connection mode.The integrity of the loop connecting with rigid tubular bus and 6-bundle conductors is poor.The seismic response of the equipment in the loop parallel to the weak axis increases obviously.And for nonlinear arrangement,the seismic response of the equipment in the loop parallel to the weak axis is greater.