500 kV composite cross arm single-circuit strain tower

Abstract

The invention relates to the field of power transmission line engineering, in particular to a 500kv composite cross arm single-circuit strain tower. The strain tower comprises a tower body, a ground wire bracket arranged at the top end of the tower body, and a first jumper cross arm, a second jumper cross arm and a third jumper cross arm used for hanging the jumpers, wherein the first jumper crossarm, the second jumper cross arm and the third jumper cross arm are all made of a through long composite material without joints in order to simplify the end joints structure and prevent the intermediate medal joints from reducing the electrical insulation performance of the post insulator, which can maximize the insulation performance of the composite cross arm; the tower body and the wire crossarm are made of a steel structure, and the jumper cross arms are made of a composite material, which can fully exert the advantages of high rigidity of the steel structure and the excellent insulation performance of composite material, and meanwhile, overcome their shortcomings respectively and achieve a perfect combination; the staggered vertically arranged jumper cross arms can effectively reduce the width of the corridor, so as to reduce the wire torque to the tower body and the deformation of the jumper frame cross arms.

Description

Technical field [0001] The invention relates to the field of transmission line engineering, in particular to a 500kV composite material cross-arm single-circuit tensile tower. Background technique [0002] Composite materials have been used in a certain range in the power industry, such as composite insulators used in power transmission lines, hollow cores for power stations, post composite insulators, insulating operating rods used in live work, and insulator lifting tools. These insulation products have undergone electrical, mechanical and corresponding aging tests before application, and show good characteristics in flashover tests, leakage current tests, and mechanical aging tests in dry or wet conditions. [0003] Composite poles have been researched more than 40 years ago. Due to process technology and resin formulation problems, they have poor anti-aging performance and short lifespan, so they have not been applied in actual line engineering. With the improvement of the per...

AI Technical Summary

Problems solved by technology

[0006] At present, composite materials are mainly used in transmission lines with lower voltage levels of 220kV and below in China. Although there are precedents for applying composite materials to 750kV and ±800kV transmission line towers in recent years, due to the electromagnetic environment of these high-voltage lines, etc. When the composite cross-arm is used, the insulation properties of the composite material cannot be fully utilized, so that the size of the tower head can be fully reduced

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