Low-smoke halogen-free flame retardant coaxial cable for nuclear power station

Abstract

The invention relates to a low-smoke halogen-free flame retardant coaxial cable for a nuclear power station, which comprises an inner conductor, an insulating layer, an outer conductor and an outer sheath, wherein the insulating layer is arranged around the inner conductor; the outer conductor is arranged outside the insulating layer; the outer sheath is arranged at the outermost layer of the low-smoke halogen-free flame retardant coaxial cable; the insulating layer is made of crosslinked polyethylene, the dielectric constant of the insulating layer is not more than 3.0, and the dielectric loss of the insulating layer is not more than 0.0001; an aluminum-plastic composite belt is arranged between the insulating layer and the outer conductor and longitudinally coats around the insulating layer; an inner lining layer is arranged outside the outer conductor and has the characteristics of low smoke content, no halogen, high flame resistance and oxygen insulation; and the outer sheath has good mechanical properties and is made of low-smoke halogen-free flame retardant polyolefin. The invention has the advantages of good electrical properties, mechanical properties and flame resistance, and the working temperature extends to -40 DEG C-90 DEG C from the traditional -15 DEG C-70 DEG C, thereby being more suitable for the working environment of a nuclear reaction shell of the nuclear power station.

Description

technical field [0001] The invention relates to a coaxial cable, in particular to a low-smoke, halogen-free, flame-retardant coaxial cable used outside the nuclear reaction shell of a nuclear power plant. Background technique [0002] Low-smoke, halogen-free, flame-retardant coaxial cables for nuclear power plants can be divided into two basic types, baseband coaxial cables and broadband coaxial cables. At present, the shielding wire of the cable commonly used in the baseband is made of copper mesh, and the characteristic impedance is 50 (such as RG-8, RG-58, etc.); the shielding layer of the cable commonly used in broadband coaxial cables is usually stamped with aluminum. As a result, the characteristic impedance is 75 (such as RG-59, etc.). The structure of the coaxial cable makes it have high bandwidth and excellent noise suppression characteristics, low cost, easy installation, and strong anti-interference ability of the network. Low-smoke, halogen-free, flame-retardan...

AI Technical Summary

Problems solved by technology

Usually, the insulation layer of coaxial cables with general structure is made of high-density polyethylene, but because the thickness of the insulation layer is required to be very thick, and this insulation material does not have flame retardant properties, it will continuously release heat during the bundled burning process, dripping A large number of flammable substances, so it is difficult to meet its high flame retardancy while meeting the electrical performance requirements, and cannot achieve the best of both worlds

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