1100kV气体绝缘金属封闭开关设备母线机械性能分析

摘要

以1100 kV气体绝缘金属封闭开关设备(GIS)母线为研究对象，采用有限元的方法，针对GIS母线在导体对外壳短路、导体悬臂、运输颠簸三种情况，对支持绝缘子所承受的应力进行计算。对比母线自振频率，对GIS母线筒在导体安装偏心导致的偏心电动力与高速风载荷下的振动进行分析。计算结果表明：在现场安装过程中，因导体支撑不稳导致导体悬臂时，绝缘子根部产生的应力最大，可达到绝缘子许用应力的80%以上，需要特别注意；若GIS母线发生短路故障，考虑壳体电阻对电流的影响，当短路点与接地点均位于壳体正上方时，绝缘子根部嵌件与环氧树脂的粘接面产生的应力最大，最大值为27.1 MPa，在最大短路电动力的作用下，能保证支持绝缘子机械性能的最佳嵌件半径为70 mm；在计算条件下，母线在偏心电动力以及高速风载荷的作用下，发生共振的可能性较小。%In the case of 1 100 kVgas insulated metal-enclosed switchgear busbar conductor was in short circuit for shell, conductor canti-levered and transportation bumps, the ifnite element analysis method was adopted to calculate the stress of the support insulator. Comparing with the bus natural frequency of vibration, this paper analyzed the gas insulated metal-enclosed switchgear busbar vibration under the ec-centric electric power caused by conductor installation eccentricity and the load of high speed wind. The calculation results show that in the process of onsite installation, the maximum of the stress caused by unstable conductor supporting cantilever, appears at the root of insulator, up to 80%of the admissible stress of insulator. If gas insulated metal-enclosed switchgear busbar short circuit fault occurs, considering the inlfuence of the shell resistance to current, when the short-circuit point and the ground point are directly above the shell, the greatest stress is produced at root of the insulator and the insert epoxy resin adhesive surface, the maximum is 27.1 MPa. The insert radius which has the best mechanical properties of support insulators is 70 mm. Under the condition of this calculation, the busbar in an eccentric electric power and high-speed wind load effect, the possibility of resonance is smaller.