Fireproof power cable with high volume used in rail transit

Abstract

A fireproof power cable with a high volume used in rail transit comprises a cable core and an outer sheath. A plurality of leads are arranged in the cable core. The each lead is formed by cladding a ceramic silicone rubber insulation layer out of a conductor. Flame retardant glass fiber ropes are arranged between the leads in the cable core. A flame retardant glass fiber band layer is arranged between the cable core and the outer sheath or the flame retardant glass fiber band layer, a silicone rubber inside liner and a steel tape armor layer are successively arranged between the cable core and the outer sheath. The power cable of the invention has good fireproof performance which can satisfy a fireproof requirement of the power cable used in the rail transit. Once a fire is generated on a usage place, during a heating process, the ceramic silicone rubber insulation layer is converted into a ceramic tubular fireproof layer. The higher the temperature is, the better the crusting performance is. The cable can work normally for more than 90 minutes at a temperature of 1200-1500 DEG C. Therefore, precious time can be gained for rescuing equipment and personnel, and losses can be reduced to a lowest degree. In addition, a working temperature of the power cable can reach 180 DEG C which is higher than the working temperature of the common cable. Under the condition of safe usage, the power cable has a larger transmission capacity than the common cable with a same specification.

Description

technical field [0001] The invention relates to a power cable, in particular to a high-capacity fire-resistant power cable for rail transit. Background technique [0002] In order to enhance the fire-resistant performance of the existing power cables for rail transit, the insulating layer of the wires in the cable core is mostly made of multi-layer mica tape wrapped around the conductor to form a fire-resistant layer and extruded with insulating materials. In the production process, it is often easy to cause defects at the lap joints of the mica tape. Moreover, the mica tape becomes brittle after fire and is easy to fall off, resulting in poor fire resistance, which makes it difficult to ensure the safe use of power cables under fire conditions. pose a safety hazard. Contents of the invention [0003] In order to overcome the shortcomings of the existing power cables for rail transit, the purpose of the present invention is to provide a high-capacity fire-resistant power ...

AI Technical Summary

Problems solved by technology

In the production process, it is often easy to cause defects at the lap joints of the mica tape. Moreover, the mica tape becomes brittle after fire and is easy to fall off, resulting in poor fire resistance, which makes it difficult to ensure the safe use of power cables under fire conditions. bring security risks

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