A method for removing and repairing the outer sheath when repairing the buffer layer of a high-voltage cable

Abstract

The invention relates to a method for removing and repairing the outer sheath when repairing the buffer layer of a high-voltage cable. The sheath withstand voltage test of the cable to be repaired is carried out before repair; the solder for filling is prepared in advance to remove the outer sheath of the cable and at the same time The cut outer sheath and the incision are chamfered at 45°; the buffer layer of the cut outer sheath is repaired, and the cut outer sheath is connected to the incision after repairing, and the filling solder is used for filling. Welding, and finally use insulating self-adhesive tape, waterproof tape and PVC tape for processing, and pass the sheath pressure test again before it can be used. The invention realizes the restoration of the original sealing performance of the cable outer sheath. The high-voltage cable outer sheath of the invention has small breaking size, excellent sealing performance, simple and convenient restoration process, and effectively ensures the sealing performance and electrical performance of the cable outer sheath. The safe and reliable operation of the cable is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of cable repair, in particular to a method for removing and repairing an outer sheath in cooperation with the buffer layer repair of a high-voltage cable. Background technique [0002] The role of high-voltage cables in urban power grids is becoming more and more important. With the continuous improvement of urban cable conversion rates, the safe operation of high-voltage cables determines the electricity consumption of thousands of households. At present, although the main failure rate of 110 (66) kV high-voltage cables in China only accounts for 0.81% of the total failure rate of cable lines, a large number of main failures belong to ablation failures in the buffer layer. [0003] In order to repair the inner buffer layer of the corrugated aluminum sheath of the high-voltage cable, it is necessary to break the corrugated aluminum sheath and inject a medium into the buffer layer gap between the corrugated a...

AI Technical Summary

Problems solved by technology

At present, although the main failure rate of 110 (66) kV high-voltage cables in China only accounts for 0.81% of the total failure rate of cable lines, a large number of main failures belong to ablation failures in the buffer layer

[0003] In order to repair the inner buffer layer of the corrugated aluminum sheath of the high-voltage cable, it is necessary to break the corrugated aluminum sheath and inject a medium into the buffer layer gap between the corrugated aluminum sheath and the outer shielding layer of the cable. Where the sheath needs to be removed, the corrugated aluminum sheath will be removed as a whole for one week. The removal area is large, and there are many accessories that need to cooperate to ensure the sealing performance, and the probability of leaks that may not be tightly sealed is high.

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