Seismic performance is meaningful for high voltage disconnect switch, which is vulnerable to the earthquake for its long span,great height,and flexibility. In this paper,a full-scale shake table test on 800 kV three-post disconnect switch is carried out to obtain its dynamical properties and seismic responses laws. The effect on disconnect switch's posts caused by the main blade is studied in different direction via characteristics of acceleration amplification factor and the spectrum analysis method. The results indicate the space lattice tilted structure form can limit the adverse impacts on seismic responses induced by the height and flexibility of the equip-ment. Meanwhile,after the main blade closed,a certain constraint effect will occur in the along-span direction, while in the across-span direction constraint effect is weak. The constraint effect can amplify and reduce the seismic responses of the post with blade and the post with fixed contact respectively.%高电压等级的隔离开关具有跨度长、重心高、柔度大等特点,对地震作用敏感,其抗震性能十分关键.为此,对某三柱式800 kV隔离开关进行了真型振动台试验研究,得到了试品隔离开关的动力特性及其在地震作用下的响应规律.并通过加速度放大效应及谱分析方法研究了隔离开关对其支柱在不同方向上的作用力特点.结果表明,试品空间格构的结构形式有效抑制了设备重心高、柔度大等特点对抗震性能带来的不利影响.隔离开关对其支柱在长跨方向上存在一定约束作用,而在横向上约束作用较弱.且隔离开关合闸后会放大动侧支柱地震响应而减小静侧支柱地震响应.
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