Novel low-smoke zero-halogen flame-retardant fire-resistant and impact-resistant cable for nuclear power station

Abstract

The invention discloses a novel low-smoke zero-halogen flame-retardant fire-resistant and impact-resistant cable for a nuclear power station. A white calcination mica tape is lapped on the periphery of a tinned copper conductor; an insulating layer is lapped on the periphery of the white calcination mica tape from inside to outside; a wrapping tape wraps the periphery of a cable core of a wire core of the insulating layer; a low-smoke zero-halogen high-flame-retardant oxygen-isolating layer is lapped on the periphery of the wrapping tape; the oxygen index of the low-smoke zero-halogen high-flame-retardant oxygen-isolating layer is greater than 35; a total shielding layer is woven on the periphery of the low-smoke zero-halogen high-flame-retardant oxygen-isolating layer; and an outer sheath is lapped on the periphery of the total shielding layer. The fire resistance rating of the cable can reach the temperature of 950-1000 DEG C, a fireproof layer of the cable cannot drop at the high temperature, and the cable resists impact and vibration, and still keeps fire resistance.

Description

Technical field [0001] The invention relates to a cable, in particular to a novel low-smoke halogen-free flame-retardant fire-resistant and impact-resistant cable for nuclear power plants. Background technique [0002] At present, synthetic mica is widely used in the design and manufacture of fire-resistant cables in our country. In addition to the characteristics of natural mica tape, this mica tape is mainly characterized by high heat resistance. In conventional occasions, fire-resistant cables made of this synthetic mica tape can meet the requirements. Low-smoke, halogen-free, flame-retardant fire-resistant cables for nuclear power plants are different from the general fire-resistant cables of 830℃. The product requirements not only comply with IEC 60754, IEC 61034, IEC 60332-1, IEC 60332-3-22 Performance, and it is also required to be able to pass the Class A fire resistance test with a temperature level of 950-1000°C and a continuous fire time of 90 minutes. Although the f...

AI Technical Summary

Problems solved by technology

During the manufacturing process, several structural layers must be bonded together, which may cause delamination and detachment of the mica tape during cable manufacturing or laying

[0003] In addition, with the existence of force majeure factors such as various earthquakes, if mechanical vibration occurs during the combustion process of the cable, the cable will lose its fire-resistant properties, and mechanical vibration is a very high probability of occurrence in a fire accident.

At the same time, the conventional fire-resistant cable with mica tape still releases toxic gas when it burns. For nuclear power plants, the product has put forward special requirements for low-smoke, halogen-free and non-toxic

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