Power control composite braided shield flexible cable for urban railway system

Abstract

The invention provides a power control composite braided shield flexible cable for an urban railway system. The power control composite braided shield flexible cable comprises a DC electric power cable core and at least two control cable cores, and is characterized in that the control cable cores are stranded at the outside of the DC electric power cable core concentrically to form a control cable core layer; the DC electric power cable core includes a DC electric power cable conductor, an extruded DC electric power cable insulation layer, a wrapped first flame retardation band, a longitudinally lapped plastic-aluminum composite band, an extruded first inner sheath layer successively from the inside to the outside; and a wrapped second flame retardation band, an extruded second inner sheath layer, a copper wire braided and coated flame-resistant material layer and an extruded outer sheath layer are arranged successively outside the control cable core layer from the inside to the outside. The flexible cable has the advantages of being high in insulating properties, being A-level in flame retardation, being low smoke zero halogen, being waterproof, being ratproof and antproof, being anti ultraviolet, being able to resist disturbance of electric field, being high in flexibility, being high in bending property and being compact in structure, and can simultaneously realize functions for electric energy transmission, control, signal, protection and measurement.

Description

technical field [0001] The patent of the present invention relates to the field of cable technology, specifically, it mainly relates to a dynamic control composite braided shielded flexible cable for urban rail transit. Background technique [0002] Urban rail transit is currently the main measure to improve the traffic environment in major international cities. Due to the particularity of rail transit, it has extremely high requirements for the safety and reliability of the power system. However, the laying environment of subway and light rail cables is complicated, and the existing technical products often cannot meet the various stringent requirements of laying at the same time; the use environment of cables for urban light rail subways is mostly densely populated underground. Escape and firefighting work posed great difficulties. Therefore, the requirements for flame retardancy are high, and the flame retardancy must meet the requirements of Class A in GB / T18380.3. At ...

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Problems solved by technology

At the same time, the release of smoke and toxic gases during combustion will hinder the fire-fighting work, and the acid gas will cause harm to people and equipment, so there are also high requirements for the release of smoke and toxic gases during combustion; cables for urban light rail and subway Due to environmental and meteorological factors, the cable may be laid in a humid environment for a long time, water molecules may soak into the cable, penetrate into the interior of the cable, be absorbed by the insulation, cause a decline in electrical performance, and cause oxidation of the conductor. Corrosion not only affects the electrical performance of the cable, but also causes abnormal disconnection accidents in severe cases. The cable must have a waterproof function; cables for urban light rail and subways are laid underground for a long time, and are vulnerable to small animals (such as rodents and ants). Affect the performance of the cable, the cable should have the function of anti-rat and anti-ant; if the cable for urban light rail subway is not used in the subway, but laid on the elevated light rail, it may withstand the test of sunlight and various weather conditions for a long time. The sheath of the cable is exposed to sunlight for a long time, and it is prone to color fading, degradation of mechanical and physical properties, and even cracking. The cable should have an anti-ultraviolet function; the space for laying cables for urban light rail and subway is limited. On the one hand, DC cables are required to be lightweight, flexible, and small turning radius

On the other hand, there are many types and quantities of cables laid in the laying pipeline, and the cables need to be small in diameter and easy to lay. In addition to a large number of power cables, urban light rail subways also need to use a large number of control, signal, protection and measurement cables. In the prior art, due to the factors that interfere with the electric field, the power cables and the control, signal, protection and measurement cables are often processed and laid separately, which not only brings difficulties to the construction, but also increases the use and construction costs; , Protection and measurement cables have small core diameters and low tensile strength, which are easy to be scratched or broken during laying

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