Insulation transfer ladder and working method for live maintenance of ±800kv DC line

Abstract

The invention discloses an insulation rotation ladder for a +-8000kV DC circuit electrified circuit upkeep and a working method. The insulation ladder comprises two parallel insulation side beams 1, an upper crosspiece 7, a lower crosspiece 8, a rotation pedestal 8, an arc suspender 2, an electric pulley 3 and an insulation rope 20; the rotation pedestal (8) is clamped on a rod tower (16); the insulation rotation ladder rotates around the rotation pedestal (8) relative to the up and down and the left and the right of the rod tower (16); the upper crosspiece (7) on the insulation rotation ladder (7) is connected to the arc suspender (2) which is connected to the insulation rope (20); the other end of the insulation rope (20) is connected to a cross arm (17) after being straighten up; the electric pulley (3) slides along the side beams, the upper rims of which are used as a guide rail; and the working staff can sit in the electric pulley (3) by leaning to one side to go into the strong electric field to perform equipotential operation. The insulation rotation ladder for the +-8000kV DC circuit electrified circuit upkeep improves the minimum combination gap of the quipotential operation and is applicable to various geographic conditions and various tower types.

Description

technical field [0001] The patent of the present invention relates to a live maintenance tool and operation method for transmission lines, in particular to an insulating rotary ladder and operation method for live maintenance of ±800kV DC lines. Background technique [0002] In recent years, as domestic ±800kV UHV DC transmission lines have been put into operation one after another, related live working methods and live working tools are also being further developed. At present, there is no tool suitable for all tower types of ±800kV DC UHV project to enter the strong electric field. Due to many reasons such as the size of the fittings, the distance between the towers, the weight of the wire fittings, etc., the live working tools of the ±800kV transmission line are heavy, bulky, and have a variety of types, and the maintenance costs are high. The current tools cannot meet the requirements of the ±800kV transmission line at all. The development and influence of the safe and ...

AI Technical Summary

Problems solved by technology

Only a part of the tower type can meet the distance requirement, but the risk of operation is increased and the safety is greatly reduced

[0004] For ±800kV DC transmission line tension string insulator towers, the traditional "cross two short three" method is generally used to enter the strong electric field, but due to the large number of insulators, the length of the insulator string increases. For example, the structural height of a 550kN insulator is 240mm. The length of the insulator strings is 15.36 to 30.24m, and the distance between the two strings of insulator strings is 650mm. Due to the increase in the length of the insulator strings and the increase in the distance between the strings, the working time of the equipotential workers increases and the labor intensity increases. And the physical fitness requirements for the equipotential personnel are very high, and the safety of the operation is greatly reduced

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