基于非线性准零刚度理论设计的变电站机柜用隔震装置试验研究

A design method of isolation device for substation cabinet based on nonlinear quasi zero stiffness theory was proposed to solve the problem of power system monitoring failure caused by the damages of substation cabinet facilities in earthquake. In this study, the dynamic model of nonlinear quasi zero stiffness was constructed, and the dynamic characteristics of the model were analyzed. It was pointed out that the response amplification phenomenon of unstable jump exists in the low frequency stage, and the isolation efficiency is higher than that of the initial isolation frequency point. According to the results of dynamic model and finite element simulation, the isolation device was devised by selecting the corresponding component parameters, and the cabinet shaking table test was carried out. When acceleration peak values of artificial seismic wave are 0.1g, 0.2g, 0.3g and 0.4g, the isolation efficiency of acceleration is 65.17%, 61.19%, 53.89% and 48.75% respectively, which showed that the isolation efficiency decreases with the increase of acceleration intensity. The initial isolation frequency of the isolation device was near 0.75Hz, the isolation efficiency reaches 72% when the excitation frequency was 2Hz, and then the isolation efficiency increases with the increase of excitation frequency. The results verified the effectiveness of the nonlinear quasi zero stiffness theory in the seismic isolation design, and provides reference and technical support for improving the seismic performance of substation power facilities.