1000kV避雷器隔震性能的有限元分析

Finite Element Analysis of Isolation Performance for 1 000 kV Arrester

地震中变电站的高压电气设备易损性极高。为探讨隔震技术在特高压电气设备中的适用性,利用ANSYS有限元分析软件,分别建立了1000kV带支架避雷器结构隔震前后的有限元模型,输入地震波时程进行动力时程响应分析。结果表明,采用基底隔震后的避雷器结构基频降低,顶端位移响应、各点加速度响应、瓷瓶根部弯曲应力较隔震前的响应都有不同程度的减小,验证了隔震系统的有效性,为隔震技术在特高压电气设备上的实际应用提供了依据。

High-voltage electric equipment in substation has high vulnerability during earthquakes.In order to investigate the applicability of isolation technology in UHV electric equipments,two finite element models of 1 000 kV arrester with and without isolation layer are established by ANSYS.And the dynamic time-history analysis using these two models are carried out by inputting earthquake waves.The results show that the arrester with base isolation has lower frequency.And its top displacement response,acceleration response,bending stress of porcelain bushings all have different degrees of reduction compared to those of arrester without base isolation.These conclusions have verified the effectiveness of the isolation system,and have provided a basis for the practical application of isolation technology in UHV electric equipments.