Environment-friendly type underground power cable

Abstract

The invention relates to an environment-friendly power cable used in subway. From inside to outside, the said environment-friendly power cable comprises of conductor (1), inner conductor screen layer (2), insulating layer (3), outer conductor screen layer (4), metal screen layer (5), and the special outer protecting layer (12) on the outside of the metal screen layer. From inside to outside, the special outer protecting layer (12) comprises of water-resisting layer (6), high-density polyethylene protecting layer (7), obstructing oxygen layer (8), armoring layer (9), low fume non-bittern protecting layer (10); or from inside to outside comprising of water-resisting layer (6), low fume non-bittern protecting layer (10), obstructing oxygen layer (8), armoring layer (9), high-density polyethylene protecting layer (7).

Description

technical field

[0001] The invention belongs to the field of power cables, and in particular relates to an environment-friendly power cable for subways. Background technique

[0002] Traditional subway power cables wrap kraft paper on the conductor, or wrap kraft paper and polypropylene alternately on the surface of the conductor, and then fill it with insulating oil to achieve power transmission through this structure. The power cable of this structure is easy to leak oil, and this structure determines that the power cable is flammable and explosive, and it will produce a lot of smoke when it catches fire. Therefore, when a fire breaks out, it is easy to cause heavy casualties and economic major losses.

[0003] For the power cables used in the subway, keeping the power system working normally in the event of a fire is a key factor to ensure the safety of people in the tunnel. Therefore, it is necessary to protect the power system from the fire for a period of time after ...

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