Mineral insulated fire control cable

Abstract

The invention discloses a mineral insulated fire control cable which comprises three round copper conductors; the outer surfaces of the round copper conductors are coated with insulation layers so asto form power conductor cores; three power conductor cores are stranded to form a cable core; an alkali-free glass fiber band is wrapped on the outer surfaces of the three power conductor cores to form a band wrapped layer; the outer surface of the band wrapped layer is coated with a shielding layer; an oxygen barrier layer is coated on the outer surface of the shielding layer; the outer surface of the oxygen barrier layer is coated with an armor layer; the outer surface of the armor layer is coated with a low-smoke fire-retardant polyolefin jacket layer; a plurality of alkali-free glass fiberfilling ropes are filled between the band wrapped layer and the cable core; and the oxygen barrier layer and the insulation layer consist of the following components in parts by weight: an ethylene-octene copolymer, ore magnesium hydroxide, zinc borate, a lubricant, a diphenylamine anti-aging agent KY405 and porcelain powder. The mineral insulated fire control cable takes good fire-retardant, fire-proof, fire-insulated, waterproof and anti-seismic effects at a high temperature; softness of the cable is ensured; and when the environment around the control cable is on a fire, hard ceramic can be formed to prevent fire so as to avoid firing of internal materials.

Description

technical field [0001] The invention relates to a power cable, in particular to a mineral insulated fireproof control cable. Background technique [0002] At present, in important places such as oil platforms, nuclear power plants, large supermarkets, intelligent buildings, airports, tunnels, subways, etc., in order to improve the safety level of electrical lines, the problem of flame retardant cables has attracted more and more attention. Higher requirements are also put forward for fire resistance, such as burning at 950°C for 180 minutes to keep the circuit intact, water spray, mechanical vibration and other special requirements. However, ordinary flame-retardant cables only limit the combustion to a certain range, and cannot be energized when the cable burns in an actual fire; traditional mica tape-wrapped fire-resistant cables can only meet simple fire-resistant tests, and cannot meet the requirements of water spray and mechanical vibration. and other special requireme...

AI Technical Summary

Problems solved by technology

[0003] Existing common control cables are mainly PVC insulation and XLPE insulation, which are used in high-rise buildings, large public places and other densely populated places. It is difficult to meet the required requirements for environmental protection, flame retardancy and fire resistance. The conventional fire-resistant and flame-retardant control cable uses the high temperature resistance and combustion resistance of the mica tape to achieve the required fire resistance, and uses flame-retardant materials to achieve the required flame-retardant performance, but this control cable has the following disadvantages :

Mica tape wrapping cable can only meet 750℃+500℃, continuous operation for 90min;

[0005] (2) Only limit the combustion to a certain range, and cannot be energized when the cable burns in an actual fire; harmful substances are produced during combustion, causing secondary damage

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