Comprehensive water-blocking ultraviolet-proof power cable for rail transit

Abstract

The invention relates to the technical field of cables for rail transit, in particular to a comprehensive water-blocking ultraviolet-proof power cable for rail transit. The power cable comprises a plurality of conductors, and a semi-conductive conductor shielding layer, an insulating layer, water-blocking yarns, a first wrapping layer, a metal shielding layer and a second wrapping layer are sequentially arranged at the outer sides of the conductors. The outer side of the second wrapping layer is provided with a water-blocking isolation layer, and the water-blocking isolation layer comprises aninner-layer double-sided aluminum-plastic composite belt and a polypropylene layer bonded with the aluminum-plastic composite belt. A water absorbing belt is arranged at the outer side of the water blocking isolation layer and is made of polyester non-woven fabric added with water absorption expansion powder, a plurality of pieces of water absorption test paper are wound on the outer side of thewater absorption band, and an outer sheath layer is extruded on the outer side of the water absorption band. The comprehensive water-blocking ultraviolet-proof power cable for rail transit is simple in structure and has the comprehensive water-blocking characteristic in the radial direction and the longitudinal direction of the cable, and is good in water-blocking effect and high in economical efficiency, and the maintenance personnel can easily observe the water immersion amount of the cable.

Description

technical field [0001] The invention relates to the technical field of cables for rail transit, in particular to a comprehensive water-blocking type anti-ultraviolet power cable for rail transit. Background technique [0002] In the field of cable technology for rail transit, power cables are the main power transmission carrier of vehicles, and their performance will directly affect the normal running of vehicles; especially in some high-cold and high-humidity areas in my country, cables work in relatively humid environments all year round , Once the cable is immersed in water, it will have serious consequences. [0003] The water-blocking characteristics of existing rail transit power cables often only focus on the radial water-blocking ability of the cable. Once the original water-blocking structure is damaged, the water will spread rapidly along the cable core longitudinally, and it will cause a wider range of cables to fail to work. On the other hand, to realize the comp...

AI Technical Summary

Problems solved by technology

[0003] The water-blocking characteristics of existing rail transit power cables often only focus on the radial water-blocking ability of the cable. Once the original water-blocking structure is damaged, the water will spread rapidly along the cable core longitudinally, and it will cause a wider range of cables to fail to work. On the other hand, to realize the comprehensive water-blocking characteristics of the cable, it is also necessary to solve the problem of conductor water-blocking, because there are gaps between the single wires in the stranded conductor, and when there is moisture in the conductor, it will flow along the conductor. rapid diffusion

[0004] When the cable has water intrusion, it is generally difficult for us to directly see the amount of water soaked by the naked eye, and it is impossible to judge the length of the damaged cable that needs to be replaced. It is easy to replace the cable that can be used by mistake.

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