Class A flame-retardant and fire-resistant cable for medium voltage expansion

Abstract

The invention relates to a medium-voltage capacity-expansion A-level flame retardant fire-resisting cable. The structure comprises a cable wire core, a waterproofing isolation belt, an inorganic compound filler, a fiberglass binding band, an inner sheath, an armor layer as well as an outer sheath, wherein the wire core is a twisting conductor, a conductor shield, an insulator, an insulation shield and a metallic shield; and the metallic shield surrounds the waterproofing isolation belt, the filler adopts special formula inorganic mineral substance composite powder, a non alkali glass silk bag belt is surrounded, and an inner protecting layer, a galvanized steel strip and a ceramic sheath material are extruded and coated outside the bag belt. The medium-voltage capacity-expansion A-level flame retardant fire-resisting cable provided by the invention has the advantages that the medium-voltage capacity-expansion A-level flame retardant fire-resisting cable meets the flame retardant A-level and fireproof requirements, the internal temperature of the insulator is kept less than 160 DEG C under the condition that the flame temperature is 800 DEG C, the circuit is guaranteed to operate normally, and a filling material is changed, so that the transmission capability of the cable is improved; and the medium-voltage capacity-expansion A-level flame retardant fire-resisting cable is flame retardant and fireproof, the transmission capacity is expanded, the production process is simple and convenient, the construction is easy, the medium-voltage capacity-expansion A-level flame retardant fire-resisting cable is applicable to places requiring strict flame retardant and fireproof requirements, such as power stations, oil fields, high-rise buildings, subways, airports and chemical industry.

Description

technical field [0001] The invention relates to a structure of a medium-voltage expansion class A flame-retardant and fire-resistant cable and a formula of inorganic filling and porcelain sheath material, belonging to the technical field of cables. Background technique [0002] In recent years, fires in major public entertainment places, chemical industry, coal mines, commercial buildings, and high-rise buildings in China have caused heavy losses of people's lives and property, and people have a deeper understanding of fire protection and fire safety; with the rapid growth of urban population, With the continuous increase of high-rise buildings, hotels, large supermarkets, hospitals, stations, and airports, the construction of subways and tunnel traffic, as well as the increase of large-scale public entertainment venues and public transportation facilities, the importance of fire safety has become prominent. How to deal with abnormal fires? Under certain circumstances, peopl...

AI Technical Summary

Problems solved by technology

In the past, medium-voltage flame-retardant and fire-resistant power cables were mostly filled with glass fiber or rock wool rope, and extruded with a thick oxygen barrier layer. During the combustion process, the insulation will also cause cable breakdown due to overheating, and electrical accidents will occur. It does not meet the continuous fire resistance requirements, and will produce a lot of smoke and harmful substances during the combustion process, causing secondary pollution to the surrounding environment

At the same time, the use of glass fiber or rock wool with high thermal resistance will affect the heat diffusion of the cable conductor, making the cable temperature too high and affecting the overall transmission capacity.

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