Special telescopic hard ladder for tension tower of ±800kv UHV DC line and its application method

Abstract

The invention relates to a telescoping hard ladder special for a + / -800kV extra-high voltage direct current line tension tower. The telescoping hard ladder comprises an upper telescoping ladder, a middle pedal and a lower telescoping ladder. The upper telescoping ladder comprises two upper vertical rods located at two sides. The lower ends of the two upper vertical rods are connected with a plurality of upper cross bars in telescoping connection. Two ends of the cross bar located at the lowest end are connected with two sides of one end of the middle pedal through hinging bolts respectively. A ladder withdrawing insulating belt is arranged between the cross bar located at the top end and the middle pedal. The lower telescoping ladder comprises two lower vertical rods located at two sides. The upper ends of the two lower vertical rods are connected with a plurality of lower cross bars in telescoping connection. Two ends of the cross bar located at the top end are connected with two sides of the other end of the middle pedal through hinging bolts respectively. A ladder withdrawing insulating belt is arranged between the cross bar located at the lowest end and the middle pedal. The special multifunctional telescoping hard ladder can adjust the length, can be employed as a hard insulating pedal, can be in bridge connection in a proper length adjusting position between two insulator strings and forms a shifting and positioning station.

Description

technical field [0001] The invention relates to tools for live working, in particular to a telescopic hard ladder specially used for a tension tower of a ±800kV UHV DC line and a method for using the same. Background technique [0002] At present, the domestic ±800kV UHV DC transmission lines have just been put into operation for a few years, and the development and development of related operating tools are in their infancy. In the process of replacing tension string insulator strings on ±800kV UHV DC lines, due to the large horizontal distance between the double insulator strings, it is difficult for operators to shift and stand on the insulator strings; During the work related to tension jumpers, operators mainly enter the jumper maintenance area through insulated hard ladders, soft ladders, and direct climbing composite insulator strings. The safety is not strong; the soft ladder has certain deficiencies in terms of safety distance guarantee and operational flexibility;...

AI Technical Summary

Problems solved by technology

In the process of replacing tension string insulator strings on ±800kV UHV DC lines, due to the large horizontal distance between the double insulator strings, it is difficult for operators to shift and stand on the insulator strings; During the work related to tension jumpers, operators mainly enter the jumper maintenance area through insulated hard ladders, soft ladders, and direct climbing composite insulator strings. The safety is not strong; the soft ladder has certain deficiencies in terms of safety distance guarantee and operational flexibility; direct climbing is easy to cause damage to the composite insulator, affecting the safe and stable operation of the line

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