Method for breaking and repairing outer sheath in cooperation with repairing of high-voltage cable buffer layer

Abstract

The invention relates to a method for breaking and repairing an outer sheath in cooperation with repairing of a high-voltage cable buffer layer. The method comprises the following steps of carrying out a sheath voltage withstanding experiment on a to-be-repaired cable before repairing, preparing welding flux for filling in advance, breaking the outer sheath of the cable, and performing 45-degree chamfering treatment on the cut outer sheath and a notch, repairing the buffer layer of the cut-off outer sheath, enabling the cut-off outer sheath to be in butt joint with the notch after repair, and adopting welding flux for filling for welding, finally, conducting treatment through an insulation self-adhesive tape, a waterproof tape and a PVC adhesive tape. The cable outer sheath can be used after passing through a sheath voltage withstanding experiment again, so that the original sealing performance of the cable outer sheath is recovered. The high-voltage cable outer sheath is small in breaking size, excellent in sealing performance and simple and convenient in recovery process, and the sealing performance and the electrical performance of the cable outer sheath are effectively guaranteed. And safe and reliable operation of the cable is ensured.

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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