A method for live replacement of lightning arrester by ground potential method and its special combination tool

Abstract

The invention discloses a method for live replacement of a lightning arrester by adopting a ground potential method and a special combined tool thereof. The method is characterized by consisting of a deformable sleeve and a lightning arrester handle, wherein the deformable sleeve comprises a lower insulating base (14), a 'U'-shaped cross arm clamping groove (2), an insulating operation rod clamping ring (3), a main insulating frame (1), a 'Pi'-shaped support (15), four bearings, two vertical gears, two horizontal gears, an operation rod sleeve connecting head (11) and a detachable sleeve (13). The lightning arrester handle comprises two mutually symmetrical insulating hand grabs (21) connected through a spring, hand grab clamping grooves (28), a top groove (29), a hand grab connecting mechanism (22), a long rotatable screw rod (25), a conical top head (26) and an operation rod hand grab connector (27). The method is simple in structure, convenient to install, safe, reliable and wide in application range, the hot-line working efficiency is improved, and the labor costs for enterprises are reduced.

Description

Technical field: [0001] The invention relates to a method for live replacement of lightning arresters by the ground potential method and a special combination tool thereof, which are widely used in the replacement of lightning arresters by the ground potential method of overhead power distribution lines, and belong to the field technical field of live maintenance of power distribution lines. Background technique: [0002] The lightning arrester is a device that artificially creates a weak point of insulation on the line or equipment, that is, the gap. The breakdown voltage of the gap is lower than the lightning impulse insulation level of the line or equipment. Breakdown grounding, discharge, and voltage reduction play a role in protecting the insulation of lines or equipment. Metal zinc oxide surge arresters are widely used in 10kV distribution lines due to their excellent performance to limit overvoltage and protect distribution lines or equipment. [0003] In practical a...

AI Technical Summary

Problems solved by technology

There are four deficiencies in the replacement of lightning arresters by the intermediate potential operation method: first, due to terrain conditions, if the pole is in a complex terrain such as mountains or orchards, the insulated arm truck cannot reach the working position and cannot carry out the work; second, the cost of the enterprise is high and requires There are a large number of workers dispatched, and large-scale vehicles are dispatched with insulated arm trucks; third, there are safety risks for the operators, the power distribution lines are compact, the electrical equipment is densely arranged, and the operating range is narrow, and the operators are close to the live body, which is prone to phase-to-ground short circuit or There is a danger of phase-to-phase short circuit; Fourth, the work efficiency is low, the work steps are many, the procedure is complicated, and the work takes a long time

[0006] The ground potential operation method means that the operator climbs the tower to the appropriate position through the foot buckle, and carries out live maintenance work through the insulating operating rod. Using this method to replace the arrester can overcome the shortcomings of the intermediate potential method when replacing the arrester. However, there is currently no ground potential method to replace the arrester. The special tool for ground potential method cannot be used to replace the lightning arrester.

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