Fire-resistant-1100 DEG C mineral low-voltage cable and preparation method thereof

Abstract

The invention relates to a fire-resistant-1100 DEG C mineral low-voltage cable and a preparation method thereof; the fire-resistant-1100 DEG C mineral low-voltage cable comprises a plurality of conductors, the plurality of conductors are annularly distributed, the outer side of each conductor is sequentially provided with a fire-resistant wrapping tape and an insulating layer, the outer sides of the plurality of conductors are provided with a first wrapping tape, and alkali-free glass fiber filling ropes are filled between the first wrapping tape and the conductors. An oxygen barrier layer, afireproof layer and a second wrapping tape are sequentially arranged on the outer side of the first wrapping tape, the first wrapping tape and the second wrapping tape are alkali-free glass fiber tapes, and an outer sheath is arranged on the outer side of the second wrapping tape. The cable is excellent in fireproof effect, slow in combustion and low in release, and heat dissipation of the cable and improvement of the current-carrying capacity are facilitated.

Description

technical field [0001] The invention relates to a cable, in particular to a 0.61kV and below refractory 1100°C mineral cable and a preparation method thereof. Background technique [0002] With the increasing scale of petrochemical plants and the higher level of automation, the safety of cables used in petrochemical plants has also attracted more and more attention from relevant parties. In petrochemical installations, cables are used in a large amount, with many specifications and varieties, and are widely distributed and irradiated. In terms of fire prevention and control, cables have the characteristics of universality, flammability, and series ductility. Once a fire occurs, the consequences will be disastrous. According to the investigation and statistics of the causes of fires in domestic petrochemical installations in recent years, 60% to 70% of fires are caused by electrical equipment accidents, and most electrical equipment insulation problems occur on cables. [0...

AI Technical Summary

Problems solved by technology

[0006] The petrochemical fire protection system requires the cable to withstand a temperature of 1093 degrees and keep the line intact for 30 minutes. The performance of the fireproof cables currently on the market cannot meet the petrochemical requirements, because the melting point of copper is 1083 degrees, so the copper sheath has melted at this temperature, and at the same time MgOH2 It is also easy to absorb moisture, and it is prone to failure at the joints, which cannot meet their needs

At present, customers use mineral insulated cables such as magnesium oxide, and then use secondary protection methods for fire prevention treatment, such as wrapping with fireproof isolation cloth, so the overall cost of installation and laying is very high, and the space for laying is greatly limited.

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