Mechanical Characteristics Simulation of UHV Insulating Pull Rod: Considering Anisotropic Composite Cylindrical Shell

As the main mechanical transmission device of GIS circuit breaker, the insulating pull rod needs to have good performance in insulation performance and mechanical strength. At present, the research on the failure mechanism of aramid composite insulating pull rod still needs to be explored. In this paper, we have considered the stability of cylindrical shell which is made of orthotropic material and analyzed the stress and buckling instability characteristics of ultra-high voltage hollow tubular insulating pull rod under different loads by using finite element method, and investigated the effects of model size and angle offset of composite laminates on mechanical properties. The results show that the stress distribution of the pull rod is uneven under tension and compression loads, and different thickness, diameter and end connection conditions will affect the buckling critical load. The stress distribution of each layer in the multi-layer shell structure is different, and the maximum stress on the outer surface is more than twice that on the inner surface. This paper expounds the mechanical failure mechanism of UHV insulating pull rod, which provides a reference for its fault diagnosis and operation maintenance.