Corrugated aluminum sheath trepanning and repairing method in cooperation with repairing of cable buffer layer

Abstract

The invention relates to a corrugated aluminum sheath trepanning and repairing method in cooperation with repairing of a cable buffer layer. A cable corrugated aluminum sheath is trepanned, an internal thread is machined, the thread is connected with a medium injection connecting piece and the hole, and the medium injection connecting piece and the cable corrugated aluminum sheath are connected into a sealed whole in a hot melting welding mode through a lead sealing technology. A medium is injected into the buffer layer in the corrugated aluminum sheath of the cable by using a medium injection connecting piece; and the medium injection connecting piece is taken out, and the electrical performance and the sealing performance of the cable corrugated aluminum sheath are recovered, so that trepanning and repairing of the cable corrugated aluminum sheath are realized. The area for breaking the cable corrugated aluminum sheath is small, the sealing performance is good, the recovery process is simple and convenient, and the original sealing and electrical performance of the cable corrugated aluminum sheath can be recovered with low requirement technical level. 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 opening and repairing a corrugated aluminum sheath when repairing a cable buffer layer. 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 aluminum sheath and t...

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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