Cross-linked polyethylene insulated flame-retardant B1-grade power cable for rail transit

Abstract

The invention discloses a cross-linked polyethylene insulated flame-retardant B1-grade power cable for rail transit. The cross-linked polyethylene insulated flame-retardant B1-grade power cable is characterized in that a core wire is arranged in a wrapping layer, a filling wire is filled between the wrapping layer and the core wire, a sheath layer is wrapped on the outer wall of the wrapping layer, and the core wire is composed of a metal wire, an insulating layer and a flame-retardant adhesive tape. An insulating layer is wrapped outside the metal wire, the insulating layer is made of a silane crosslinked polyethylene insulating material, and the wrapping layer comprises a non-woven fabric layer and a polyethylene layer. The polyethylene layer is made of a polyethylene material, and the polyethylene material prepared from polyethylene, ammonium polyphosphate, nano vermiculite, copper sulfate pentahydrate, polypropylene wax, an antioxidant and polyketone resin enables the polyethylenelayer to have high flame retardance and high insulativity. The flame-retardant adhesive tape, the filling wire and the sheath layer are all made of halogen-free low-smoke flame-retardant polyolefin materials, so that the flame retardance of the power cable is improved. Meanwhile, the tensile property of the core wire made by winding the flame-retardant adhesive tape is improved.

Description

technical field [0001] The invention relates to the field of flame-retardant cables, in particular to a cross-linked polyethylene insulated flame-retardant B1-level power cable for rail transit. Background technique [0002] Flame retardant power cable refers to the cable that the sample is burned under the specified test conditions. After the test fire source is removed, the spread of the flame is only within a limited range, and the residual flame or residual flame can extinguish itself within a limited time. The fundamental characteristic is: in the case of fire, it may be burnt out and cannot operate, but it can prevent the spread of fire. In layman's terms, if the wire catches fire, it can limit the combustion to a local area without spreading, and keep other equipment to avoid greater losses. [0003] Existing flame-retardant power cables are mainly divided into two categories: halogen-containing flame-retardant power cables and halogen-free low-smoke flame-retardant ...

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Problems solved by technology

[0003] Existing flame-retardant power cables are mainly divided into two categories: halogen-containing flame-retardant power cables and halogen-free low-smoke flame-retardant power cables. The former has good flame-retardant properties, but it will release a large amount of dense smoke and halogen acid gas when the cable is burned , Halogen acid gas is corrosive to the surrounding electrical equipment. Rescuers need to wear gas masks to approach the scene to extinguish the fire. When the cable burns, it will cause harm to the surrounding electrical equipment and rescue personnel, which is not conducive to fire fighting and rescue work, resulting in serious accidents. "Secondary hazard"; the latter not only has better flame retardant properties, but also has no halogen acid gas released when the cable burns, and the smoke emission of the cable is also small, but the mechanical properties are poor, easy to deform, easy to break, and the service life is low

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