特高压气体绝缘开关设备瓷套管抗震性能研究

为评估某型号1 100kV特高压(UHV)气体绝缘开关设备(GIS)瓷套管的抗震性能,将其连同支撑筒体与支架一起安装在振动台上,开展特高压气体绝缘开关设备瓷套管振动台试验。试验采用符合特高压标准反应谱的人工波激励该瓷套管,得到瓷套管关键部位的加速度、位移和应变响应。运用数值仿真软件ABAQUS对该振动台试验进行数值仿真研究,分析试验模型的自振频率、套管根部应力和套管顶端相对位移,得到与试验结果吻合较好的结果,证明该数值仿真模型的有效性。通过数值仿真的手段研究套管固有频率和本体(支撑筒体和支架)刚度的变化对套管抗震性能的影响,结果表明:该套管固有频率在一定范围内变化时,其地震响应相对较小;随着本体刚度的增大,套管根部最大应力与套管顶端最大相对位移均呈下降的趋势,因此适当增大本体的刚度可以降低套管的地震响应。

Seismic Performance of Ultra High Voltage Gas Insulated Switchgear Porcelain Bushing

To evaluate the seismic performance of a porcelain bushing for 1 100 kV ultra-high voltage (UHV) gas-insulated switchgear (GIS), the porcelain bushing with its supporting stand and canister were installed on a shaking table platform, and a shaking table test was carried out on the UHV GIS porcelain bushing. In the shaking table test, an artificial wave that conforms to the UHV standard response spectrum was used to excite the porcelain bushing. The dynamic characteristics of the porcelain bushing, the acceleration and displacement response of the bushing top, and the strain response of the bushing root were obtained. The numerical simulation on the shaking table test was performed using the simulation software ABAQUS, and then the natural vibration frequency of the model, the stress of the bushing root, and the relative displacement of the bushing top were obtained. The values are well consistent with the test results, which proves the efficiency of the numerical model. The influence of the natural frequency of the bushing and stiffness of the body (support cylinder and bracket) on the seismic performance of the bushing were studied by numerical simulation. The results show that the seismic response of the bushing is relatively small when the natural frequency changes within a certain range. The maximum stress of bushing root and maximum relative displacement of bushing top decrease with increase of body stiffness; therefore, the seismic response of the bushing can be reduced through the increase of body stiffness.