变压器–套管体系抗震加固理论分析及振动台试验
Theoretical Analysis and Shaking Table Test on Seismic Reinforcement of Transformer-bushing System
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摘要: 抗震加固可以抑制变压器升高座摆动,降低套管的地震响应,减轻套管震害。该文基于串联分布参数模型,建立了加固后的变压器–套管体系理论模型,通过变压器仿真模型振动台试验验证了加固方法的有效性和理论模型的准确性,并通过参数分析获取了加固支撑的最优参数。结果表明:安装加固支撑后变压器–套管体系地震响应降低,降低率最高可达20%以上;理论计算结果与试验结果吻合较好;支撑安装角度、轴向刚度和抗弯刚度等参数存在最优取值,使加固后的变压器–套管体系地震响应明显降低且加固支撑制造成本适中。该方法能够很好地减小升高座摆动对套管地震响应的放大效应,理论模型可用于确定支撑的最优参数,为支撑设计提供指导。Abstract: Seismic reinforcement can restrain the swing of transformer turret, reducing the seismic responses and damage of bushing. In this paper, a theoretical model of the reinforced transformer-bushing system was established based on series model with distributed parameter. The effectiveness of the reinforcement method and the accuracy of the theoretical model were verified by shaking table tests on a transformer simulation model. The optimal parameters of the reinforcement support were obtained by parameter analysis. The results show that the seismic response of the transformer-bushing system decreases after installing supports, and the reduction rate reach more than 20%. Theoretical calculation results match test results well. There are optimal values in installation angle, axial stiffness and flexural stiffness of the support, which makes the seismic responses of the reinforced transformerbushing system are reduced significantly and the cost of the reinforcement support is moderate. The seismic reinforcement method can effectively reduce the amplification effects on the seismic responses of the bushing caused by the oscillation of the turret. The theoretical model can be used to determine the optimal parameters of the support and provide guidance for the design of the support.
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