A novel seismic base isolation system has been developed for high-voltage (HV) porcelain post insulators. The seismic isolation device consists of two steel plates, four polyurethane springs, and a steel rod, which are low-cost components compared to the post insulators. Two alternative designs of the device are experimentally and numerically assessed in this article. A simple and robust numerical model consisting of linear line elements and nonlinear springs was generated, and subsequently validated using the experimental results. Incremental dynamic analyses (IDAs) were then performed to obtain fragility curves. Ten historical earthquake profiles, scaled to intensities between 0.1 and 2.0 g, were then applied to the numerical models. The fragility curves, generated according to the latest version of IEEE-693, demonstrate that the seismic isolation devices are highly effective in diminishing the base moment of the porcelain insulator. It should be noted that relatively large displacements at the top of the pole must be accounted for by ensuring adequate slackness in the flexible conductors.

已经开发出一种新颖的地震基础隔离系统，用于高压（HV）瓷柱绝缘子。隔震装置由两块钢板，四个聚氨酯弹簧和一根钢棒组成，与支柱绝缘子相比，它们是低成本的组件。本文通过实验和数值评估了该设备的两种替代设计。生成了一个由线性线元和非线性弹簧组成的简单而强大的数值模型，随后使用实验结果对其进行了验证。然后进行增量动态分析（IDA）以获得脆性曲线。然后将十个历史地震剖面（强度定为0.1到2.0 g）应用于数值模型。脆性曲线是根据最新版本的IEEE-693生成的，证明了隔震装置在减小瓷绝缘子的基本力矩方面非常有效。应该注意的是，必须通过确保挠性导体有足够的松弛度来解决极点顶部相对较大的位移。