Flexible mineral insulation aluminum conductor fireproof cable

Abstract

A flexible mineral insulation aluminum conductor fireproof cable comprises a cable conductor formed by a single or three insulated conductors respectively including a conductor and is characterized in that every conductor comprises an aluminum conductor, every cable conductor comprises a mineral insulation layer wrapped outside the conductor and an insulation reinforcing layer wrapped outside the mineral insulation layer in a pressing mode from inside to outside, a cooling thermal insulation fire-proof layer covers the outside of every cable conductor, an inner fireproof thermal insulating layer is wrapped outside the cooling thermal insulation fireproof layer, an armored thermal insulation fire-blocking layer is wrapped outside the inner fireproof thermal insulating layer, an outer fireproof thermal insulating layer is wrapped outside the armored thermal insulation fire-blocking layer, and a flame retardant fireproof outer sheath is wrapped outside the outer fireproof thermal insulating layer in a pressing mode. The flexible mineral insulation aluminum conductor fireproof cable is low in costs and light in weight and can fully meet the requirement that the temperature rise of the aluminum alloy cable conductor does not exceed 200 DEG C after the aluminum alloy cable conductor is subjected to a fire resistance test for 90 minutes at a temperature of 750 EDG C.

Description

technical field [0001] The invention relates to the field of power transmission and distribution, in particular to a low-voltage fireproof aluminum core cable of 1kV or below. Background technique [0002] With the rapid development of economy and society, the voltage level of user distribution transformers (substations) in building facilities and relatively densely populated urban streets, factories, mines, and residential quarters has generally increased. A large number of 1kV and below power cables are used in the distribution network of users, so that the demand for 1kV cables has risen sharply. Since power cables need to pass through building facilities and relatively densely populated areas, and power cables in these areas are affected by complex natural factors, power accidents may occur. In order to prevent power accidents from causing fires, or in the case of fire damage The power cable will not cause secondary accidents, and the power cable is required to have a r...

AI Technical Summary

Problems solved by technology

[0003] The Chinese Utility Model Patent No. 201220048583.1 discloses a fireproof cable with a bellows sheath with a three-layer fireproof structure. The copper bellows is used as the first fireproof layer, and mineral powder mud (refractory soil) is used as the second fireproof layer. The high temperature resistant mica tape is used as the third fireproof layer. Although the copper bellows cannot be melted below 1000°C, it can transfer heat quickly, so the first fireproof layer only plays the role of isolating the flame, not heat insulation. effect; although the second fireproof layer can withstand high temperature and can cool down during the ceramization process, but because the ceramization cooling process is very short, and the high temperature introduced from the copper bellows is continuous, the temperature dropped by ceramization It is quickly offset by the incoming temperature, and the ceramicized refractory soil can still conduct heat. Under the action of continuous high temperature outside, the high temperature is quickly transmitted to the insulating layer. Although the halogen-free low-smoke flame-retardant polyolefin insulating layer can Flame retardant, but plastic deformation will occur at high temperatures above 200°C, which will lead to insulation failure of the insulating layer

It can be seen that the existing fireproof cable can only use copper core conductors instead of aluminum core conductors, and it cannot meet the fireproof standard requirements of cables stipulated in the standard.

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