Insulating overhead cable

Abstract

The invention relates to an insulating overhead cable. The insulating overhead cable comprises a wire core, conductor layers and an insulating layer which are sequentially wrapped layer by layer, wherein three conductor layers are provided; each conductor layer is formed by twisting single wires having an S-shaped cross section or a Z-shaped cross section by taking the wire core as an axis; each conductor layer forms a complete circle; and conductor layers are tightly connected with each other. Compared with similar products in the prior art, in the insulating overhead cable, the conductors are tightly twisted, a filling coefficient maximally can reach 95%, and in the case of identical current-carrying capacity, the insulating overhead cable has a smaller outer diameter than a compressed cable, and thus insulating material can be saved; since the insulating overhead cable is formed by direct twisting rather than compression, a phenomenon of burrs does not exist, a problem of breakdown in a withstand voltage test caused by burrs in the conductors is solved, and thus safety of a power transmission line is improved; and the direct twisting does not cause any waste in repair, because with the direct twisting, the power transmission line does not get broken and beyond repair due to compression.

Description

technical field [0001] The invention relates to an overhead cable, in particular to an insulated overhead cable. Background technique [0002] At present, wire and cable manufacturers adopt the method of compacting the conductive cores when producing overhead insulated cables. This method has great defects: (1) the conductor filling factor can only reach about 90%; The conductor is prone to burrs during the compaction process, which leads to the breakdown of the withstand voltage test. Even if the factory withstand voltage test passes, the existence of the burrs becomes a safety hazard of the power line; It is impossible to repair the thread at all, and it can only be cut off, causing a lot of waste. Contents of the invention [0003] The object of the present invention is to provide an insulated overhead cable with simple structure, tight conductor twisting, excellent electrical performance and no burrs in order to overcome the above-mentioned defects in the prior art. ...

AI Technical Summary

Problems solved by technology

[0002] At present, wire and cable manufacturers adopt the method of compacting the conductive cores when producing overhead insulated cables, which has great defects: (1) the conductor filling factor can only reach about 90%; (2) the conductors, especially aluminum The conductor is prone to burrs during the compaction process, which leads to the breakdown of the withstand voltage test. Even if the factory withstand voltage test passes, the existence of the burr becomes a safety hazard of the power line; The thread cannot be repaired at all, but can only be cut, resulting in a lot of waste

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