Metal wire woven graphene composite shielding low-load DC (direct current) high-voltage flexible cable

Abstract

The invention relates to the technical field of cables, particularly to a metal wire woven graphene composite shielding low-load DC high-voltage flexible cable. The metal wire woven graphene composite shielding low-load DC high-voltage shielding flexible cable comprises a conductor and an insulating layer press-wrapping the conductor; the conductor and the insulating layer compose an insulating cable core; a layer of polyester film is wound outside the insulating cable core in a stacked mode, a layer of graphene conducting tapes are wound outside the polyester film, a layer of metal wire woven shielding layer is arranged outside the graphene conducting tapes, and a layer of environment-friendly outer sheath press-wraps the metal wire woven shielding layer; the inside of the polyester film is filled with environment-friendly flexible fillings. The metal wire woven graphene composite shielding low-load DC high-voltage flexible cable has the advantages of being high in shielding effects and anti-interference performance, safe in operation and flexible and can work safely and reliably under high-voltage.

Description

technical field [0001] The invention relates to a cable, in particular to a metal wire braided graphene composite shielding low-load DC high-voltage flexible cable. Background technique [0002] In wires and cables, shielded cables with a metal layer are mainly used for various electrical appliances, instruments, telecommunications, computers, networks and other control systems that require anti-interference, power equipment and automation devices. If it is a mobile occasion, metal wires are mainly used Braided shielding, as a wire braided shielding cable, the wire braiding density is specified (usually not less than 80%). [0003] For low-load high-voltage DC flexible cables, 1. It is necessary to ensure that the cables have very good flexibility during the use of mobile devices. This requires that in addition to the conductors, not only the conductors must be twisted with multiple strands of thin metal wires, but the insulation thickness should also be quite large. Thin. ...

AI Technical Summary

Problems solved by technology

2. Under low load and high voltage, in addition to the soft insulation of the conductor, it is also necessary to ensure the softness of the cable shielding layer and whether it is convenient to ground the cable shielding layer

[0005] 1. The insulation thickness of existing cables under high voltage is relatively thick. For example, in the current technical specification for extruded insulated power cable systems for DC transmission with a rated voltage of 500KV and below, the recommended nominal thickness of the insulation for 80KV DC land cables is 9.0mm. This does not meet the flexibility requirements

[0006] 2. Electrostatic interference can be generated under the action of capacitive coupling between wire cores under high voltage, and electromagnetic induction interference can be generated by energized current

At present, the softness and shielding of low-load high-voltage DC cables cannot be obtained at the same time. The existing metal shielding is divided into two types, namely, wire braided shielding and full metal tape shielding.

If only wire braided shielding is used, the advantage is that the wire braided shield is relatively soft and it is more convenient for grounding in mobile occasions and systems; the disadvantage is that the wire braided shield has a braided gap and the shielding effect is not very ideal, because the metal wire braided is a layer There are a lot of unwoven gaps in the mesh structure, which affects the shielding coefficient and shielding effect. The smaller the weaving density, the greater the effect

If metal tape shielding is used, although the shielding effect is better, but the bending resistance of metal tape shielding is poor, it is not suitable for some occasions with frequent bending. In addition, metal tape shielding is not convenient for grounding.

Therefore, the shielding softness of the metal wire braid meets the requirements but the shielding performance is not ideal, and the shielding effect of the metal tape is good but the softness does not meet the requirements

[0007] Therefore, under high voltage, it is necessary to ensure the thin-walled insulation and good shielding effect of the cable, and to ensure the softness of the cable for mobile use. The current materials and processes used in the product are difficult to achieve.

[0008] 3. In the production process of metal wire braiding, the phenomenon of broken metal wires cannot be completely eliminated, so that the burrs at the broken wires of the metal wire weaving are easy to pierce the cable insulation, and the cable breaks down during the withstand voltage test or fails during use.

At present, the metal wire braided shielding is used to wrap the polyester tape outside the cable core before braiding. The polyester tape is also easily pierced by the metal wire, which affects the insulation performance and the effect is not ideal.

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