支柱绝缘子互连体系地震易损性分析

Seismic Fragility Analysis of Connected Post Insulators

为了评估支柱绝缘子互连体系的抗震可靠性,需要考虑地震动输入波形和输入方向的随机性。通过讨论有限元建模与分析方法,运用概率地震易损性分析理论,得到了典型的支柱绝缘子互连体系在不同强度和不同输入方向的地震下损伤的概率。结果表明:该支柱绝缘子互连体系在八度大震下失效的概率为16.2%,对应输入方向为横向。以失效概率为评价指标的易损性分析方法 ,统一了电气设备抗震性能评价指标,为变电站的整体抗震可靠度评价打下了基础。

In order to assess the seismic reliability of connected post insulators system, the randomness of input waveform and input direction of ground motions need to be considered. On the basis of discussing the finite dement modeling and analysis method, the damage probabilities of a typical connected post insulators system under different ground motion intensities and input directions are obtained by using the probabilistic seismic fragility analysis theory. The results show that the failure probability of the connected post insulators system is 16.2% under 8-degree intensity earthquake with transverse motion input. By taking the failure probability as assessment indicator, the fragility analysis method unifies the seismic performance indicator of electrical equipment and lays a foundation for seismic reliability analysis of a whole substation.