Cross-linked polyethylene insulated cable

Abstract

The invention relates to a cross-linked polyethylene insulated cable. The cross-linked polyethylene insulated cable includes a positioning core located at the center of the cable, four cross-linked polyethylene insulating sleeves, a tubular metal inner sheath, a tubular buffer protective sleeve and a tubular outer sheath; a space between the metal inner sheath and the four cross-linked polyethylene insulating sleeves is filled with a thermal conduction insulation layer; a thermal conduction protective layer is arranged between the metal inner sheath and the buffer protective sleeve; and a plurality of metal wires which form a structure shaped like a Chinese character "pin" are embedded in the thermal conduction protective layer. With the cross-linked polyethylene insulated cable adopted, a technical defect of sharp deformation or deviation of conductor bundles in an ordinary cross-linked polyethylene insulated cable under external forces such as distortion, torsion, folding, bending and cutting can be eliminated, and normal work of the conductor bundles and subsequent installation and construction can be ensured. Under the effects of the thermal conduction insulation layer, the metal inner sheath, the thermal conduction protective layer and the metal wires, the cable is high in heat dissipation efficiency and excellent in heat transfer effect, the service life of the cable can be prolonged.

Description

technical field [0001] The invention relates to a cable, in particular to a cross-linked polyethylene insulated cable. Background technique [0002] XLPE insulated cables use chemical or physical methods to change the molecular structure of cable insulating polyethylene from a linear molecular structure to a main network molecular structure, that is, thermoplastic polyethylene is transformed into a thermosetting cross-linked polyethylene, thereby greatly improving its performance. Excellent heat resistance and mechanical properties, reducing its shrinkage, making it no longer melt after being heated, and maintaining excellent electrical properties. [0003] Cross-linked polyethylene insulated cables use peroxide cross-linking method to make polyethylene molecules change from linear molecular structure to three-dimensional network structure, from thermoplastic material to thermosetting material, and the working temperature is increased from 70°C to 90°C, significantly Improv...

AI Technical Summary

Problems solved by technology

[0004] However, during the use of the existing cross-linked polyethylene insulated cables, the internal wire bundles often deform or shift, which not only seriously affects the installation and construction of the cables, but even damages the cables and reduces the service life of the cables.

There are two main situations where the wire harness is often deformed or shifted: one is that the XLPE insulated cables are laid indoors, in trenches and pipes, used in high drop areas, and can also be buried in loose soil, so Often under the action of external force, when the cable is twisted, twisted, bent, bent, cut off and other external forces during the construction process, the internal wire harness will be greatly deformed or shifted; the other is, cross-linked The maximum rated temperature of the wire harness inside the polyethylene insulated cable is 90°C. When the XLPE insulated cable is abnormal during use, such as when some lines are short-circuited, the maximum temperature of the wire bundle can reach 250°C. Because the internal components of the polyethylene insulated cable are very dense, and in order to ensure the stability of the insulation and waterproof performance of the XLPE insulated cable, the heat inside the XLPE insulated cable cannot be dissipated in a timely and rapid manner. The internal components of vinyl insulated cables will undergo large expansion deformation and offset at high temperature, which seriously affects the use of XLPE insulated cables

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