Medium-voltage aluminum alloy overhead insulated cable and preparation method thereof

Abstract

The invention relates to the technical field of cables, and specifically discloses a medium-voltage aluminum alloy overhead insulated cable and a preparation method thereof. The medium-voltage aluminum alloy overhead insulated cable comprises a cable core, wherein the cable core comprises a conductor, an inner shielding layer coating the conductor and an insulating layer coating the inner shielding layer, the conductor comprises a circular single core layer arranged at the center and at least two compressing layers sequentially arranged outside the circular single core layer, each compressinglayer comprises a plurality of stranded molded wire conductors, and the molded wire conductors of the adjacent two compressing layers are arranged in a mutually staggered manner, so that the performance stability of the cable is effectively improved. The medium-voltage aluminum alloy overhead insulated cable is extruded and molded by adopting a three-layer co-extrusion mode, a connecting piece ofan extruding machine and a machine head is adjusted so as to enable a second extrusion channel to be of a micro cone structure with a feeding port being small, a discharging port being large and an inclination angle of the inner wall being 8 degrees, and the adhesion between the conductor and the inner shielding layer is improved to 260N. Meanwhile, the monitoring of online monitoring equipment improves accurate control for the size of the cable, and the laser printing identifier can better improve the recognition clarity and the abrasion resistance.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a medium-voltage aluminum alloy overhead insulated cable and a preparation method thereof. Background technique [0002] At present, the aluminum alloy overhead insulated wire conductors produced in China mostly use circular compacted conductors, resulting in the actual cross-section of the conductor being smaller than the cross-section of the conductor core profile, that is, the compaction coefficient of the cable is small. The shielding layer or insulating layer of the conductor is more or less embedded in the gap between the conductors, resulting in a decrease in the smoothness of the shielding interface of the conductor, which in turn affects the electrical performance of the cable and causes waste of subsequent auxiliary materials. Moreover, the extrusion production of aluminum alloy overhead insulated wires generally adopts the design of ordinary double-layer co-extrusion he...

AI Technical Summary

Problems solved by technology

[0002] At present, the aluminum alloy overhead insulated wire conductors produced in China mostly use circular compacted conductors, resulting in the actual cross-section of the conductor being smaller than the cross-section of the conductor core profile, that is, the compaction coefficient of the cable is small. The shielding layer or insulating layer of the conductor is more or less embedded in the gap between the conductors, resulting in a decrease in the smoothness of the shielding interface of the conductor, which in turn affects the electrical performance of the cable and causes waste of subsequent auxiliary materials

Moreover, the extrusion production of aluminum alloy overhead insulated wires generally adopts the design of ordinary double-layer co-extrusion head and semi-extrusion head. Low adhesion, easy to slip, affecting product quality

At the same time, the strength or weather resistance of the insulating layer of the conductor is not high, which will lead to rupture during transportation or long-term use, and then damage the shielding layer, resulting in reduced insulation and shielding effects

In addition, inkjet printing is used to spray codes, and the content of the codes will be completely weathered within a few years, making it difficult to identify

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