An ultra-high voltage (UHV) composite bypass switch (BPS) faces increasing seismic challenges when UHV projects extend to high seismic intensity areas. The UHV composite BPS still generates excessive stress at the bottom section although hollow composite insulators with high flexural strength are adopted. Since the standard retrofitting strategy by using stiffer supports cannot reduce stress responses, wire rope isolation is introduced. The optimal design of isolation considers both stress and displacement responses since the slenderness and composite material of insulators contribute to significant displacement. The results show that properly designed isolation can significantly reduce stress without excessive displacement responses. A larger radius configuration helps to improve the applicability of small stiffness isolators under high winds. When the isolation still cannot satisfy the requirement, smaller stiffness isolators with a larger radius, or isolators with increased loops and smaller radius, can be introduced to gain better energy dissipation capacity and effectiveness in response mitigation. Accordingly, a three-step design procedure is proposed to increase the damping force but fix the rotational stiffness of isolation. Hence, the application of wire rope isolation can be extended to UHV composite BPS with a low natural frequency, but conductors with enough redundancy should be used.

当特高压项目扩展到高地震烈度区域时，超高压（UHV）复合旁路开关（BPS）面临着日益严峻的地震挑战。尽管采用了具有高抗弯强度的中空复合绝缘子，但特高压复合BPS的底部仍然产生过大的应力。由于使用较硬的支撑件的标准改装策略无法降低应力响应，因此引入了钢丝绳隔离。绝缘的最佳设计同时考虑了应力和位移响应，因为绝缘子的细长和复合材料会造成很大的位移。结果表明，正确设计的隔离结构可以显着降低应力，而不会产生过多的位移响应。较大的半径配置有助于提高小刚度隔离器在强风下的适用性。当隔离仍不能满足要求时，可以引入具有较大半径的较小刚度的隔离器，或具有增大的环路和较小半径的隔离器，以获取更好的能量消耗能力和缓解响应的有效性。因此，提出了一个三步设计程序来增加阻尼力但固定隔离的旋转刚度。因此，钢丝绳隔离的应用可以扩展到具有低固有频率的特高压复合BPS，但应使用具有足够冗余的导体。提出了一个三步设计程序来增加阻尼力但固定隔离件的旋转刚度。因此，钢丝绳隔离的应用可以扩展到具有低固有频率的特高压复合BPS，但应使用具有足够冗余的导体。提出了一个三步设计程序来增加阻尼力但固定隔离件的旋转刚度。因此，钢丝绳隔离的应用可以扩展到具有低固有频率的特高压复合BPS，但应使用具有足够冗余的导体。