Crosslinked polyethylene insulated low-smoke halogen-free flame-retardant fireproof power cable

Abstract

The invention discloses a crosslinked polyethylene insulated low-smoke halogen-free flame-retardant fire-resistant power cable core which comprises a cable core. The cable core comprises an insulating layer, a reinforcing rib and three conductors. The three conductors abut against each other and are arranged at equal intervals, and the reinforcing rib is connected in a cavity enclosed by the outer walls of the three conductors in a penetrating manner; the outer wall of the cable core is coated with the insulating layer, the outer wall of the insulating layer is provided with a plurality of evenly-distributed limiting grooves, the inner walls of the limiting grooves are slidably connected with one side of a limiting batten, the two ends of the limiting batten abut against the inner wall of an inner sheath, and the outer wall of the inner sheath is coated with an armor layer; and the outer wall of armor layer is coated with a mica tape fireproof layer, and the outer wall of the mica tape fireproof layer is coated with an outer sheath. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant fire-resistant power cable provided by the invention is good in voltage resistance and protection capability, relatively weak in heat conduction efficiency, and high in heat resistance and fire resistance. And meanwhile, the cable has higher pulling resistance and bending resistance.

Description

technical field [0001] The invention relates to a cable, in particular to a cross-linked polyethylene insulated low-smoke, halogen-free, flame-retardant and fire-resistant power cable. Background technique [0002] The development and development of flame-retardant and fire-resistant power cables began in the 1970s, and with its excellent fire resistance and combustion resistance, no flame delay and the ability to maintain normal power-on operation for a certain period of time in the case of fire and combustion, its resistance Combustion means that when a wire and cable fire accident occurs, it can block and delay the spread and extension of the flame along the wire and cable, and minimize the expansion of the fire range of the wire and cable. This type of cable has the characteristic of self-extinguishing after ignition. It can be generally understood that when the wire and cable product catches fire by itself or by an external heat source, the wire and cable product will n...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing fire-resistant cables are composed of multi-layer structures tightly covered and laminated. The tight structure improves the thermal superconductivity efficiency between the cable mechanisms to a certain extent, making the internal structure of the cable easy to accumulate and damage the heat conduction; at the same time, Some heat-resistant cables have insufficient pressure resistance and bending resistance, and are prone to bending damage when subjected to external forces

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