特高压变电站内110 kV电容器组模型地震模拟振动台试验

Shaking Table Test on Model of 110 kV Capacitor Bank in UHV Substation

为明确110 k V电容器组地震响应规律,提高特高压变电站的地震安全性,首次对特高压变电站内110 k V电容器组模型进行地震模拟振动台试验研究。通过振动台试验的方式,测定电容器组模型的动力特性及地震作用下关键部位的加速度、位移、应变等参数。试验结果显示,试件两水平向1阶频率分别为2.69 Hz、3.39 Hz,处于地震动卓越频率段;试件结构对地震加速度有放大作用,且放大作用与高度呈非线性关系;在目标峰值加速度为0.2g(g=9.8 m/s2)的地震波作用下,试件最大应变出现在底部绝缘子根部,计算得到最大应力为25.10 MPa,低于绝缘子破坏应力。该研究明确110 k V电容器组具有较高地震易损性,抗震关键部位为底部支柱绝缘子,为该类设备的抗震性能研究提供了数据支撑。

In order to definite the seismic response regularities of the 110 kV capacitor bank and to improve seismic safety of UHV substation, we experimentally studied a model of 110 kV capacitor bank in UHV substation by shaking table. The dynamic characteristics of the model and the acceleration, the displacement, the strain of key parts were measured by shaking table test. The test results show that the primary frequencies in two horizontal directions are 2.69 Hz and 3.39 Hz, which are in the range of the dominant ground frequencies. The structure of the specimen can accelerate the amplification, and there is a nonlinear relationship between the amplification and the height. Under the earthquake action of which the basic earthquake acceleration is 0.2g, the maximum strain appears at the bottom of the insulator, and the maximum stress is 25.10 MPa which is lower than the failure stress of the insulator. It is found that the seismic vulnerability of 110 kV capacitor bank is definite. The seismic key location of the equipment is bottom insulator. The results offer data support for seismic research of capacitor bank.