Medium-voltage fire-resistant cable

Abstract

The invention discloses a medium-voltage fire-resistant cable which comprises at least one conductor (1), wherein the exterior of the conductor (1) is provided with a conductor shielding layer (2), an insulating layer (3), an insulation shielding layer (4), a metal shielding layer (6), a fire-resistant layer (8), an oxygen-and-thermal barrier layer (9) and an outer sheath (10) in sequence, wherein the fire-resistant layer (8) is a ceramic silicon rubber layer; and when the number of the conductor (1) is three, a flame-retardant asbest rope packing layer (5) is arranged between the metal shielding layer (6) and the fire-resistant layer (8), and the exterior of the flame-retardant asbest rope packing layer (5) is provided with a non-alkaline glassfibre belting cabling winding layer (7). In the technical scheme of the invention, a hard ceramic armor can be formed by virtue of high-temperature burning and a protection line can be kept unblocked, the longer the burning time is, the harder the ceramic armor is, the ceramic armor has good insulating property and can fully ensure the cable to be fire-resistant and voltage-resistant; and meanwhile, the medium-voltage fire-resistant cable has low cost, is easy to install and lay and is convenient to use.

Description

technical field [0001] The invention relates to a power transmission cable, in particular to a low-smoke, halogen-free, flame-retardant, fire-resistant and environment-friendly medium-voltage fire-resistant cable. Background technique [0002] With the continuous progress and development of society and the improvement of people's living standards, people pay more and more attention to the safety of life. It is becoming more and more important and urgent. Based on the reports of major fires, the fires caused by the spontaneous combustion of wires and cables account for a large proportion, and the proportion of casualties caused by wires and cables also accounts for a large proportion. For example, shortly after the fire broke out, the power transmission of the wires and cables that were subjected to power transmission was interrupted, causing elevators and lighting to not work normally, causing people to panic and cause casualties. [0003] At present, fire-resistant cables ...

AI Technical Summary

Problems solved by technology

[0004] Usually the structure of the fire-resistant cable is wrapped mica tape, which not only has low production efficiency, but also is difficult to control and has low quality reliability, and the mica tape cannot withstand excessive voltage

The mica tape should be wrapped around the surface of the conductor. However, the interface between the medium voltage cable insulation and the conductor should be smooth and round, and there should be a layer of extruded semi-conductive layer to prevent excessive partial discharge. If the mica tape is wrapped around the surface of the conductor, the It will cause the partial discharge of the cable to exceed the standard and cause fatal defects

[0005] In addition, the mica tape becomes hard and brittle after burning, and it is easy to fall off

Images