在运变电站电流互感器隔震改造仿真及应用研究

Simulation and Application Research on Seismic Isolation Transformation of Current Transformer in Operated Substation

支柱类电气设备在地震作用下具有较高的易损性。为了确保电气设备在强震作用下的正常工作状态,对110 kV电流互感器进行现场动力特性测试和有限元数值仿真建模,采用含有钢丝绳阻尼器的组合隔震支座对在运的电流互感器进行了隔震设计,计算并对比分析了隔震前后设备的地震响应。结果表明:在地面峰值加速度为0.4g的地震作用下,采用支架顶部隔震的电气设备套管根部的应力可以减少到原结构的一半以下;在钢丝绳阻尼器的布置方面,充分考虑带槽钢层的电气设备双向不对称结构在地震作用下变形的差异性,同等抗弯刚度时增加阻尼器的间距可以获得更好的耗能特性;在运变电站设备的原位加固方式可以提高设备的基本频率,采用支架顶部隔震是提高在运变电站抗震性能的有效措施。

The support type electrical equipment has high vulnerability under seismic action.For assuring the nor⁃mal operation condition of the electrical equipment under strong seismic action,the site dynamic characteristic test and the finite element numerical simulation model of a 110 kV current transformer are set up,the combined damp⁃ing isolation support containing wire rope damper is adopted to perform the isolation design of the operated current transformer,calculate,compare and analyze the seismic response of the equipment before and after the isolation.The result shows that under the seismic action of 0.4g peak ground acceleration(PGA),the stress at the bottom of the electrical equipment bushing with the isolation on top of support can be reduced less than half of the original struc⁃ture.In terms of the arrangement of wire rope dampers,the deformation difference of bidirectional asymmetric struc⁃ture with channel section layer equipment under earthquake shall be fully considered,and better energy dissipation characteristics can be obtained by increasing the separation of dampers under the same bending rigidity.The in⁃situ reinforcement method of equipment in the substation can improve the basic frequency of the equipment,and adop⁃tion isolation on top of the support is an effective measures to improve the seismic performance of the substation.