Fireproof medium-voltage multi-core cable

Abstract

The invention relates to a fireproof medium-voltage multi-core cable. The fireproof medium-voltage multi-core cable comprises cable cores, a flame-retardant glass fiber wrapping belt wrapping the cable cores, and a first-layer fireproof and fire-resistant sheath wrapping the flame-retardant glass fiber wrapping belt; each cable core comprises a conductor as well as an inner screen, an insulating layer and an external screen which sequentially coat the conductor from inside to outside, wherein the external screen is wrapped with a buffer semi-conductive belt, wherein the buffer semi-conductive belt is wound with an SZ-type copper wire; the first-layer fireproof and fire-resistant sheath is wrapped with a second-layer fireproof and fire-resistant sheath; and the exterior of the second-layer fireproof and fire-resistant sheath is provided with a second flame-retardant glass fiber wrapping belt. The buffer semi-conductive belts of the fireproof medium-voltage multi-core cable are high-temperature buffer semi-conductive belts which can play a role of thermal expansion, buffering and heat insulation; the SZ-type copper wires are wound on the high-temperature buffer semi-conductive belts through special process so as to replace copper wires, so that the SZ-type copper wires can shrink freely with the expansion cooling of the materials of the inner layers when being heated, and therefore, the pressing marks of insulation wire cores can be prevented. With the fireproof medium-voltage multi-core cable of the invention adopted, the shortcomings of existing cable products can be greatly eliminated.

Description

technical field [0001] The invention relates to a cable structure technology, in particular to a fireproof medium voltage multi-core cable technology. Background technique [0002] Application No. 201410499068.9, Authorized Announcement No. CN 104240832 B, the invention patent document titled: "A Flame-Retardant Fireproof Cable" discloses a cable: "It is made of four insulated wires, and the aluminum-plastic wire wrapped around the insulated wires Composite tape, braided layer outside the aluminum-plastic composite tape, inner sheath wrapped by extrusion coating outside the braided layer, armored layer wrapped outside the inner sheath, outer sheath coated by extrusion coating outside the armored layer It is composed of a sheath; it is characterized in that each insulated wire is composed of a conductor, a polyethylene insulation layer covering the conductor, and a ceramic insulation layer extruded and coated on the polyethylene insulation layer; the drainage core wire is loc...

AI Technical Summary

Problems solved by technology

[0003] The existing problem is that each insulated wire is composed of a conductor, a polyethylene insulating layer covering the conductor, and a ceramic insulating layer extruded and coated on the polyethylene insulating layer, and the insulating core is wrapped with an aluminum-plastic composite tape. There is no insulation expansion buffer layer after heating, which will easily cause the insulation core to expand after heating and cause insulation mark damage

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