Operating method for replacing linear V insulator string on super and ultra-high voltage direct current transmission line in electrified mode

Abstract

The invention provides an operating method for replacing a linear V insulator string on a super and ultra-high voltage direct current transmission line in an electrified mode. The method comprises the following steps that an iso-electric level is entered through a tangent tower; a cross arm side clamp or a connecting tool is installed with a reserved construction hole formed in the position over a wire connecting plate or a main material as a side pivot of a cross arm of the tool; two sets of wire lifting systems which are independently stressed are respectively connected through the cross arm side clamp or the connecting tool; a hydraulic lead screw is operated to lift a wire to transfer a mechanical load of the insulator string; the insulator string to be maintained is dismounted. According to the operating method, due to the fact that the two sets of wire lifting systems stressed independently are utilized for protection, the adopted tools bear small loads compared with the tools in a single wire lifting system, the size of the adopted tools can be moderately small when the same loads are borne, the distance of a gap between the wire and the cross arm is correspondingly lengthened, and the electrification operation can be carried out more safely. In addition, due to the fact that the size of the tools becomes small, the operating method has the considerable advantages in the aspects of transporting, installing and improving the maintaining efficiency.

Description

【Technical field】 [0001] The invention relates to the field of ultra-high voltage and ultra-high voltage power transmission and transformation, in particular to an operation method for live replacement of straight V insulator strings in ultra-high voltage and ultra-high voltage direct current lines. 【Background technique】 [0002] Transmission line operation, maintenance and repair work is an important means to grasp the operation of the power grid, discover and deal with equipment defects in time, and is also the basic work to ensure the safe and stable operation of the line. Since the UHV power grid is at the core of the operation of the entire national grid, the operation and maintenance of the UHV power grid is of great significance to ensure the safe, stable and reliable operation of the UHV power grid and even the entire national power grid. [0003] In EHV and UHV DC transmission lines, although the average span in the plain area of ​​the general line section is large...

AI Technical Summary

Problems solved by technology

[0005] In the upward line of the UHV DC transmission line, when the straight tower is at the maximum vertical span, the vertical mechanical load of the double "V" insulator string can reach 12.26T. If the traditional positive lifting method is used to lift the line to transfer the mechanical load of the insulator string , the wire lifting load of the wire lifting tool is only 6.7T, it is difficult to guarantee to meet the requirements

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