A method for manufacturing inorganic fireproof medium and high voltage cables

Abstract

The present invention discloses a method for manufacturing an inorganic fireproof medium-high voltage cable. The method comprises the following steps: A, performing wire drawing; B, performing conductor stranding; C, performing three-layer co-extrusion chemical crosslinking; D, wrapping a buffer layer; E, performing wrapping and phase separation on a metal shielding layer; F, performing cabling; G, extruding an oxygen barrier layer; H, performing inorganic fireproof layer wrapping; I, performing metal mounting; J, performing wrapping; K, extruding the outer sheath; and L, performing performance detection. According to the method provided by the present invention, the relationship between the electrical properties and the fire fireproof performance of the medium-high voltage cable is fullyconsidered, the balance between the two is solved, and instead of the traditional wrapped or extruded ceramized silicone rubber, the grouting inorganic fireproof layer is taken as the heat insulationlayer, so that the fireproof characteristics of the cable are greatly improved; and the medium-high voltage cable manufactured by using the method is laid on the building and has strong fireproof performance, so that the damage to the power system caused by sudden fires and the like can be greatly delayed.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a method for manufacturing inorganic fireproof medium and high voltage cables. Background technique [0002] In today's society, the economy continues to grow, science and technology continue to advance, and the cable industry, which is the link of information and energy transmission, has developed rapidly. With the sharp increase in the demand for cables, the safety of their use has also received widespread attention. However, the sheath and insulation in the cable construction are generally made of plastic and rubber materials. The so-called places where cables are densely laid can easily cause fires. The dense laying of wires and cables is mainly concentrated in densely populated places such as high-rise buildings, subways, large entertainment venues, etc., and large national key projects such as nuclear power plants, petrochemicals, tunnels, airports, post and telecommunicati...

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Problems solved by technology

[0004] At present, most of the voltage levels of fire-resistant power cable products are concentrated at 1kV or below. However, if some super-large high-rise buildings and large-scale national key projects adopt 0.6 / 1kV low-voltage power distribution according to the usual practice, the amount of cables and the workload of laying and installation will be reduced. , which is dozens of times larger than the usual buildings, and the cable laying space is several times larger, which consumes both materials and energy, and too many cables in the building, too large, will also have an adverse effect on safe use

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