Direct-current traction cable for high-performance track traffic

Abstract

The invention discloses a direct-current traction cable for high-performance track traffic. The cable comprises a conductor, a rubber insulation layer, a water-proof flame-retardant composite belt and an outer sheath. The conductor is covered with the rubber insulation layer, the rubber insulation layer is covered with the water-proof flame-retardant composite belt, the water-proof flame-retardant composite belt is covered with the outer sheath, longitudinal water-proof structures are arranged in the conductor and arranged between the conductor and the rubber insulation layer respectively, and the water-proof flame-retardant composite belt comprises a glass fiber layer, a water-proof layer and a flame-retardant layer, wherein the water-proof layer and the flame-retardant layer are arranged on the two sides of the glass fiber layer respectively. The rubber insulation layer is made from modified ethylene propylene diene monomer rubber, has excellent electrical performance, and can ensure that the insulation layer will not broken down; the water-proof flame-retardant composite belt can effectively achieve the water-proof flame-retardant effect. The outer sheath is made from ethylene vinyl acetate and polyolefin elastomer mixture, and has excellent flexibility, weather resistance, ageing resistance, halogen-free low-smoke flame retardance and rat and termite prevention.

Description

technical field [0001] The invention relates to the technical field of rail transit cables, in particular to a high-performance direct current traction cable for rail transit. Background technique [0002] In recent years, with the advancement of rail transit technology and the wide application of DC traction equipment, a few domestic companies have developed and put DC cables into use. However, in the actual use process, some domestic DC cables have some deficiencies. Through the information fed back by the subway company, the following main problems are summarized: [0003] 1. The outer sheath of the cable is cracked: some materials are improperly selected, and some are caused by the stress generated during bending that cannot be eliminated, which leads to the outer sheath cracking after the cable has been running for a period of time; [0004] 2. Cable insulation breakdown: Most rail transit DC cables use XLPE and EPDM as insulation materials. As we all know, XLPE or EPD...

AI Technical Summary

Problems solved by technology

However, during their processing, manufacturing and use, the charge residue, electrode injection or polarization or polarization problems caused by impure materials will cause the accumulation of space charges in the insulating material, thereby reducing its dielectric properties and even shocking. Put on

[0005] 3. The softness of the cable is not good enough: hard cable material is inconvenient to lay and construct, and cannot meet the requirements of softness and small bending radius;

[0006] 4. Insufficient cable performance: The waterproof, weather-resistant, anti-ultraviolet, rodent-proof, oil-resistant, heat-resistant, cold-resistant and halogen-free low-smoke flame-retardant characteristics of the cable are not perfect enough to fully meet the harsh environmental conditions of the subway.

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