Sectioned combination-type wind-deflection-preventing composite insulating inhaul cable and installation method

Abstract

Disclosed is a sectioned combination-type wind-deflection-preventing composite insulating inhaul cable including high-voltage-side hardware fittings, an upper rod body, a lower rod body and a middle pole. The upper end of the upper rod body and the lower end of the lower rod body are each connected with a high-voltage-side hardware fitting. The middle pole is connected between the upper rod body and the lower rod body. Each of the upper rod body and the lower rod body includes a rod core and an umbrella skirt at the outer side of the rod core. The rod cores are epoxy-resin glass-fiber-reinforced-plastic pulling rods. The umbrella skirts are silicone-rubber composite umbrella skirts. The cable is capable of preventing effectively deflection of wires, relative to a pole tower under the action of strong wind and preventing wind-deflection trip of lines so that safe operation level of power transmission lines is improved.

Description

technical field [0001] The invention relates to the field of high-voltage transmission lines, in particular to a wind deflection flashover device for high-voltage transmission lines. Background technique [0002] The wind deflection of the transmission line refers to the phenomenon that the wire deviates under the action of the wind, resulting in insufficient insulation distance to the tower and flashover discharge. The success rate of closing is low due to the heavy wind of the line, which often causes serious consequences such as arc burns of conductors, broken strands, and disconnected wires. The wind deflection of transmission lines is one of the main factors affecting the safety of transmission lines, especially the frequent occurrence of wind deflection flashover accidents on 500kV transmission lines, which has caused great harm to the operation safety of transmission lines. [0003] Overhead transmission lines run in the wild for a long time and are greatly affected ...

AI Technical Summary

Problems solved by technology

When wind deflection occurs, it is usually accompanied by severe weather activities such as strong winds and thunderstorms, which makes it difficult to judge and find faults

At present, the common prevention and transformation measures are to install jumper strings or heavy hammers on the wires of the wind deflection fault, but the wind deflection effect of the wires is often unsatisfactory under these two methods of transformation.

First of all, the wires with jumper strings are still prone to wind deflection tripping; second, the heavy hammer has a large surface area and is easy to go for a ride. When the strong wind blows to the hammer, it will cause wind deflection flashover

Thirdly, after installing heavy hammers on the conductors, each piece of heavy hammers weighs several hundred kilograms, and the force of the conductors has a certain upper limit according to the design requirements, so an extra load is added to the tower. It is necessary to re-check the load of the tower, and at the same time, the design margin will be sacrificed for the tower, which will easily cause damage to the tower in strong winds. The cost of the hammer is high, the transportation is inconvenient, and the cost of transformation and installation is high

Images