Enhanced-type fireproof high-voltage cable

Abstract

The invention discloses a reinforced fire-resistant high-voltage cable, which includes a cable core. The cable core is formed by twisting three insulated wire cores; ‑1.5mm composite flame-retardant tape, the composite flame-retardant tape is extruded with a PVC inner liner with a thickness of 2.35‑4.75mm, and a soft water pipe with a thickness of 1‑2cm is arranged outside the inner liner, and a thick water pipe is provided outside the soft water pipe It is a metal armor layer of 3-6mm, and the metal armor layer is provided with a PVC outer sheath with a thickness of 2-4mm; the water supply hole and the water outlet hole are provided in the soft water pipe. The invention has the advantages of good flame retardancy, good strengthening performance, good self-supporting performance, good fire resistance, etc., and has the function of automatic cooling.

Description

technical field [0001] The invention relates to the field of power cables, in particular to a reinforced fire-resistant high-voltage cable. Background technique [0002] With the acceleration of my country's economic construction, medium-voltage power distribution systems in important places such as high-rise buildings, subways, power plants, nuclear power plants, and tunnels have put forward higher requirements for the safety of cables under fire conditions, so medium-voltage fire-resistant The cable should be produced on the surface, but due to the special electrical performance requirements of the medium-voltage cable, the general production method of the low-voltage fire-resistant cable cannot be used, and a special production method is required, which leads to a large structural size of the medium-voltage fire-resistant cable, which is difficult for laying and installation. In view of this situation, according to the characteristics of medium-voltage fire-resistant cables...

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Problems solved by technology

[0005] When adopting the above first method, since the conductor and insulation of the cable are equipped with refractory materials, but this type of cable is a medium voltage power cable, its special electrical performance requires that the core must be made of conductive core, conductor shield, XLPE Composed of insulation and insulation shielding, metal shielding, etc., when there is refractory material involved, it will obviously affect the current carrying capacity of the cable. In order to ensure its current carrying capacity, it is necessary to increase the cross section of the ground conductor, so that the outer diameter of the cable is made larger. , and heavy

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