35kV-level single-core waterproof flame-retardant fireproof cable for rail transit

Abstract

The invention discloses a 35kV-level single-core waterproof flame-retardant fireproof cable for rail transit. The cable comprises a conductor, an insulating co-extrusion layer coating the conductor and a metal shielding layer coating the insulating co-extrusion layer. The cable is characterized in that: a water-blocking layer coats the metal shielding layer, a composite flame-retardant fire-insulating layer coats the water-blocking layer, an armor layer coats the composite flame-retardant fire insulating layer, and a composite outer protective layer coats the armor layer. The flame retardant property of the cable meets the requirement of the flame retardant B1 level in the GB 31247-2014 Standard of Classification for burning behavior for electrical and optical cables, and the fire resistance of the cable meets the requirement in the TICW 8-2012 Standard of Fire-resistant power cables with extruded insulation for rated voltages from 6kV up to 35kV, so that the product can reduce possible fire hazard to the minimum. Meanwhile, the cable can normally operate to keep the long-time power supply capability when a fire occurs, and guarantees are provided for fire rescue and power supply of special equipment.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a single-core waterproof, flame-retardant and fire-resistant cable for 35kV rail transit. Background technique [0002] With the continuous acceleration of urbanization and the medium- and long-term development plan of my country's railways, medium-voltage power distribution systems in engineering buildings and rail transit tunnels have put forward very high requirements for the flame-retardant and fire-resistant performance of medium-voltage power cables, which are used in specific places. Flame-retardant and fire-resistant medium-voltage power cables are of great significance to the fire safety of engineering buildings and rail transit. [0003] For a long time, due to the lack of grading standards for cable combustion performance, it was only necessary to achieve low-smoke and halogen-free Class A bundle combustion in the past. Now it is unanimously recognized that fires in crow...

AI Technical Summary

Problems solved by technology

[0004] In addition, in the actual application of the existing rail transit cables, some parts may be completely immersed in water, and the water molecules will penetrate into the interior of the cable, resulting in a decrease in the electrical performance of the insulation, and even a safety accident. The cable is required to have excellent water resistance; Power cables are mostly designed with a combination of mica tape and flame-retardant materials. The heat insulation and fire-blocking properties of plastics are not particularly good. It cannot guarantee that the cable can supply power for a long time in the event of a fire, which is not conducive to the smooth escape of firefighters.

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