CN117153464A - Winding fracture-preventing high-voltage cable - Google Patents

Abstract

The invention discloses a winding fracture-resistant high-voltage cable, which comprises an outer sheath and a plurality of conductors sleeved in the outer sheath, wherein a nylon net wrapping layer is arranged in a gap formed by the conductors and the outer sheath, the nylon net wrapping layer comprises a nylon net wrapping framework, and a nylon wire layer is wound on the outer surface of the nylon net wrapping framework; the outer sheath comprises an insulating shielding layer which is adhered to and coated outside a nylon wire layer, a second braiding layer is coated on the outer layer of the insulating shielding layer, a steel wire layer is coated on the outer side of the second braiding layer, a nylon belt layer is coated on the outer side of the steel wire layer, a conductor shielding layer is coated on the outer side of the nylon belt layer, a first braiding layer is coated on the outer side of the conductor shielding layer, and a wrapping layer is spirally wound on the outer side of the first braiding layer; the conductor comprises a wire core and a conductor protective sleeve sleeved on the outer surface of the wire core, and an insulating reset filling block attached to the surface of the conductor is filled in a gap formed between adjacent conductors, so that the strength of the cable is improved, and the cable is not easy to break when being bent.

Description

Winding fracture-preventing high-voltage cable

Technical Field

The invention belongs to the field of electric power, and particularly relates to a winding fracture-preventing high-voltage cable.

Background

A high voltage cable is one of the power cables, and is used for transmitting power between 1kv and 1000kv, and is mostly used for power transmission and distribution, and during use, cable breakage may occur due to the following reasons: (1) mechanical damage: during installation, maintenance and use, the cable may be subjected to external forces such as bending, extrusion, stretching, etc., which may cause damage to the insulation or conductors of the cable, and in addition, the underground cable may be affected by road, building or other underground facilities construction, which may cause damage or breakage. (2) Electrical problems: underground cables may be subject to electrical faults, such as overvoltages, short circuits, etc. These faults may cause damage to the insulation of the cable, which in turn causes breakage of the cable. (3) Environmental factors: underground cables may be subject to environmental factors such as moisture, chemical corrosion, and subsurface microbial attack. These factors may accelerate degradation and damage to the cable, resulting in cable breakage. (4) Manufacturing defects: certain underground cables may have manufacturing defects such as unreasonable cable design, poor material quality, improper production process, etc.

The situation that the cable is bent and broken due to extrusion or stretching by external force is particularly common, the high-voltage cable has high manufacturing cost and is buried below the ground, and the maintenance cost is very high, so that the structure of the cable needs to be optimized to have high strength and high bending resistance.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide the winding fracture-preventing high-voltage cable, which has the advantages that the strength of the cable is improved, and the cable is not easy to fracture during bending.

In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:

the winding fracture-resistant high-voltage cable comprises an outer sheath and a plurality of conductors sleeved in the outer sheath, wherein a nylon mesh wrapping layer is arranged in a gap formed by the conductors and the outer sheath, the nylon mesh wrapping layer comprises a nylon mesh wrapping skeleton, and a nylon wire layer is wound on the outer surface of the nylon mesh wrapping skeleton;

the outer sheath comprises an insulating shielding layer which is adhered to and coated outside a nylon wire layer, a second braiding layer is coated on the outer layer of the insulating shielding layer, a steel wire layer is coated on the outer side of the second braiding layer, a nylon belt layer is coated on the outer side of the steel wire layer, a conductor shielding layer is coated on the outer side of the nylon belt layer, a first braiding layer is coated on the outer side of the conductor shielding layer, and a wrapping layer is spirally wound on the outer side of the first braiding layer;

the conductor comprises a wire core and a conductor protective sleeve sleeved on the outer surface of the wire core, and an insulating reset filling block attached to the surface of the conductor is filled in a gap formed between adjacent conductors.

Further, the conductors comprise a first conductor positioned at the center of the outer sheath and a plurality of second conductors surrounding the periphery of the first conductor;

the insulating reset filling block is filled in the gap between two adjacent second conductors.

Further, the insulating reset filling block comprises a nickel alloy filling framework and an insulating layer wrapping the nickel alloy filling framework.

Further, three surfaces of the insulating reset filling block, which are clung to the first conductor and the second conductor, are of concave arc structures, and one surface of the insulating reset filling block, which is clung to the nylon net wrapping framework, is of an outer concave arc structure.

Further, a non-woven fabric layer is spirally wound outside the conductor protective sleeve.

Further, the conductor protective sleeve comprises an inner bending-resistant layer coated outside the wire core, an insulating layer is coated outside the inner bending-resistant layer, anti-extrusion fibers are coated outside the insulating layer, anti-bending ribs are coated outside the anti-extrusion fibers, a copper strip shielding layer is coated outside the anti-bending ribs, an outer bending-resistant layer is coated outside the copper strip shielding layer, and a non-woven fabric layer is wound outside the outer bending-resistant layer.

Further, the inside carbon fiber silk parcel skeleton that is equipped with of conductor protective sheath cladding in the sinle silk outside, carbon fiber silk parcel skeleton is including first carbon fiber silk and the second carbon fiber silk of hugging closely mutually, and quartz fiber silk spiral winding is in first carbon fiber silk and the outside of second carbon fiber silk, and quartz fiber silk is laminated mutually with interior bending resistance layer and sinle silk.

Further, the nylon wires comprise a first nylon wire and a second nylon wire which are wound on the outer surface of the nylon net wrapping framework in a cross manner.

Further, the first conductor, the second conductor and the insulating reset filling block are all spirally distributed in the outer sheath.

Further, the wire core is stranded multi-strand copper wires.

Compared with the prior art, the invention has the following technical effects:

when the high-voltage cable is extruded or stretched by external force, the resilience speed of the cable is enhanced by the nylon belt layer in the outer sheath, and the strength of the cable is enhanced by the steel wire layer, so that the outer sheath can buffer and adsorb extrusion force and stretching force applied to a local area, when the extrusion force and the stretching force act on the inside of the outer sheath, the nylon mesh wrapping framework performs buffer and adsorption, and when the outer sheath is damaged, the nylon mesh wrapping framework can prevent a conductor from being leaked in an external environment, and the strength of the cable is further improved. Therefore, the nylon net wrapping layer is matched with the outer sheath, so that the probability of breakage of the cable due to overhigh bending strength is effectively reduced, the service life of the cable is prolonged, and the maintenance cost is reduced.

The conductor protective sleeve is used for wrapping the wire core, so that leakage in the current conveying process is reduced, and the outer bending-resistant layer and the inner bending-resistant layer are matched with each other, when the conductor protective sleeve receives bending acting force, force received by a bending area can be buffered, meanwhile, the bending opposite direction area is prolonged, extrusion force and stretching force received by the cable bending area are reduced, the inner bending-resistant layer, the insulating layer, the extrusion-resistant fiber, the bending-resistant rib, the copper strip shielding layer and the outer bending-resistant layer which are sequentially arranged in a stacking manner can buffer, absorb and release the received extrusion and stretching points at the same time, and in addition, the extrusion-resistant fiber can enhance the whole extrusion-resistant capability of the conductor protective sleeve, so that damage to the wire core caused by external impact is reduced, and further, the bending-resistant strength of the cable is improved; electromagnetic waves appearing outside can be isolated through the copper strip shielding layer, the electromagnetic waves are prevented from affecting the structure of the cable, and current leakage can be avoided through the insulating layer.

The non-woven fabrics layer of spiral winding in the conductor protective sheath outside can insulate against heat the conductor, has reduced the heat energy that external environment transmitted to the cable and has influenced its internal current's transport, and non-woven fabrics layer plays the filling effect in addition to the space between oversheath and the conductor, prevents to remove the in-process, and the damage that arouses because of the buffer force is not enough between conductor and the oversheath adopts spiral winding mode, can increase winding area, reduces the quantity of use of non-woven fabrics.

The carbon fiber wire wrapping framework can be used for improving the overall strength of the conductor protective sleeve, compared with the existing cable, the carbon fiber wire wrapping framework is light in weight of a protective layer made of materials such as metal, plastic or rubber, so that the weight of the cable is reduced, the cable can be prevented from being difficult to transport and install due to overhigh weight, in addition, the quartz fiber wire is used for reinforcing the first carbon fiber and the second carbon fiber, and the breaking strength of the carbon fiber wire in use is reduced.

Drawings

FIG. 1 is a schematic overall structure of the present invention;

FIG. 2 is a schematic cross-sectional elevation view of the present invention;

FIG. 3 is a schematic view of a left-hand partial cross-sectional structure of the present invention;

FIG. 4 is a schematic view of the nylon mesh wrapped skeleton of the present invention;

FIG. 5 is a schematic view of a partial cross-sectional structure of a carbon fiber filament-wrapped framework of the present invention;

fig. 6 is a schematic cross-sectional view of a conductor protective sleeve according to the present invention;

FIG. 7 is a schematic structural view of a carbon fiber filament-wrapped skeleton according to the present invention;

FIG. 8 is a schematic cross-sectional view of an insulation reset filling block according to the present invention;

FIG. 9 is a schematic cross-sectional elevation view of an outer sheath of the present invention;

in the figure: 1. a first conductor; 2. an outer sheath; 3. a second conductor; 4. an insulating reset filling block; 5. a conductor protective sleeve; 6. nylon net wrapping skeleton; 7. copper wire; 8. a first nylon yarn; 9. a second nylon yarn; 10. a non-woven fabric layer; 11. carbon fiber yarn wrapping the framework; 1101. a first carbon fiber filament; 1102. a second carbon fiber yarn; 1103. quartz fiber yarn; 12. an outer bending resistant layer; 13. a copper tape shielding layer; 14. bending-resistant ribs; 15. an anti-extrusion fiber; 16. an insulating layer; 17. an inner bending layer; 18. wrapping the layer; 19. a first braid; 20. a conductor shielding layer; 21. nylon belt layers; 22. a steel wire layer; 23. a second braid; 24. an insulating shielding layer; 25. a first insulating layer; 26. nickel alloy filling skeleton; 27. and a second insulating layer.

Detailed Description

The following examples illustrate the invention in further detail.

As shown in fig. 1, fig. 2 and fig. 8, a wound fracture-resistant high-voltage cable comprises an outer sheath 2, a first conductor 1 and a second conductor 3 sleeved in the outer sheath, wherein the first conductor 1 is positioned in the center of the outer sheath 2, four second conductors 3 surround the periphery of the first conductor 1, insulation reset filling blocks 4 are filled in gaps between two adjacent second conductors 3, three surfaces of the insulation reset filling blocks 4 close to the first conductor 1 and the second conductor 3 are of concave arc structures, so that the insulation reset filling blocks 4 can be attached to the outer surfaces of the first conductor 1 and the second conductor 3, the insulation reset filling blocks 4 comprise a nickel alloy filling framework 26 and an insulation layer wrapped outside the nickel alloy filling framework 26, the insulation layer is divided into a first insulation layer 25 and a second insulation layer 27, the nickel alloy filling framework 26 is fully wrapped through the first insulation layer 25 and the second insulation layer 27, so that current is prevented from extending outwards from the nickel alloy filling framework 26, and meanwhile, after the nickel alloy filling framework 26 is subjected to external force Wen Huidan, deformation of the first conductor 1 and the second conductor 3 and the original conductor 3 can be maintained;

preferably, the first conductor 1, the second conductor 3 and the insulating reset filling block 4 are all spirally distributed in the outer sheath 2;

as shown in fig. 3 and 9, the outer sheath 2 includes an insulating shielding layer 24 adhered to and coated on the outer surface of the nylon wire layer, the insulating shielding layer 24 prevents the electric current from generating partial discharge between the first conductor 1 and the second conductor 3 and the insulating layer 16, the outer surface of the insulating shielding layer 24 is coated with a second braiding layer 23, the outer surface of the second braiding layer 23 is coated with a steel wire layer 22, the steel wire layer 22 is used for increasing the integral strength of the outer sheath 2, the steel wire layer 22 includes a rubber sleeve and steel wires coated in the steel wire layer 22, the outer surface of the steel wire layer 22 is coated with a nylon belt layer 21, the nylon belt layer 21 is in a strip shape and surrounds the outer surface of the steel wire layer 22, so as to increase the tensile level of the integral outer sheath 2, and at the same time, the bending area bears the force to absorb the electric current, and at the same time, the rebound speed of the electric cable is increased, the outer surface of the insulating shielding layer 21 is coated with a conductor shielding layer 20, the conductor shielding layer 20 is used for isolating the electromagnetic wave released by the first conductor 1 and the second conductor 3, the outer surface of the shielding layer 20 is coated with a first braiding layer 19, the outer surface of the first braiding layer 19 is spirally wound on the outer surface of the first braiding layer 19, and the winding layer 18 is used for reducing the damage to the first layer 19 in the braiding process around the friction layer 18;

by matching the nylon belt layer 21 and the steel wire layer 22, the steel wire layer 22 is assisted to reset by the reaction force in the rebound process of the nylon belt layer 21 when the nylon belt layer is in bending contact, so that the problem that the steel wire layer 22 is not in time for rebound is reduced, when a cable is in the bending process, the bending and stretching area is effectively protected, and the problem of breakage caused by the fact that extrusion force and stretching force are not released in time after the outer sheath 2 is bent is effectively prevented;

as shown in fig. 2, fig. 5 and fig. 6, the first conductor 1 and the second conductor 3 each include a wire core and a conductor protecting sleeve 5 sleeved on the outer surface of the wire core, the wire core is stranded multi-strand copper wire 7, a non-woven fabric layer 10 is spirally wound outside the conductor protecting sleeve 5, the non-woven fabric layer 10 can insulate the first conductor 1 and the second conductor 3, the transmission of internal current of the cable is reduced due to the heat energy transferred to the cable from the external environment, in addition, the non-woven fabric layer 10 plays a role in filling gaps between the outer protecting sleeve 2 and the first conductor 1 and the second conductor 3, damage caused by insufficient buffering force between the first conductor 1 and the second conductor 3 and the outer protecting sleeve 2 in the moving process is prevented, and the winding area can be increased and the use amount of non-woven fabrics is reduced by adopting a spiral winding mode;

the conductor protection sleeve 5 comprises an inner bending-resistant layer 17 coated outside a wire core, an insulating layer 16 is coated outside the inner bending-resistant layer 17, the insulating layer 16 is used for blocking the copper wire 7 so as to avoid the occurrence of current leakage, an anti-extrusion fiber 15 is coated outside the insulating layer 16, the anti-extrusion fiber 15 is used for enhancing the whole anti-extrusion capability of the conductor protection sleeve 5 so as to avoid the influence of external impact on the copper wire 7, an anti-bending rib 14 is coated outside the anti-extrusion fiber 15, a copper strip shielding layer 13 is coated outside the anti-bending rib 14, the copper strip shielding layer 13 is used for blocking electromagnetic waves appearing outside, so that the influence of the electromagnetic waves on the structure of a cable is avoided, an outer bending-resistant layer 12 is coated outside the copper strip shielding layer 13, when the cable is bent, the outer bending-resistant layer 12 buffers the force born by a bending area, the bending reverse direction area is prolonged, so that extrusion and stretching forces born by the cable bending area are reduced, meanwhile, the anti-bending rib 14, the outer bending-resistant layer 12 and the inner bending-resistant layer 17 buffer the extruded and stretched points, and the non-woven fabric 10 are released outside the bending-resistant layer 12 by laminating the conductor protection sleeve 5 in a short time between each other;

the bending-resistant rib 14 is made of steel wire or fiber material having excellent bending resistance and high strength, and is capable of providing sufficient support and protection when the cable is subjected to bending stress;

the outer bending-resistant layer 12 is made of a wear-resistant and corrosion-resistant material (such as a polymer material, a rubber material or plastic, etc.), plays a good role in protection and buffering, and reduces external damage to the cable in the use process;

the inner bending prevention layer 17 is made of a soft conductive material (e.g., copper or aluminum, etc.), and can ensure good stability and transmission efficiency of the cable when transmitting signals or power.

As shown in fig. 5 and 7, the carbon fiber yarn wrapping skeleton 11 wrapping the outside of the wire core is arranged inside the conductor protecting sleeve 5, the carbon fiber yarn wrapping skeleton 11 comprises a first carbon fiber yarn 1101 and a second carbon fiber yarn 1102 which are closely attached, the quartz fiber yarn 1103 is spirally wound outside the first carbon fiber yarn 1101 and the second carbon fiber yarn 1102, the quartz fiber yarn 1103 is attached to the inner bending resistance layer 17 and the wire core, the integral strength of the conductor protecting sleeve 5 is increased by the first carbon fiber yarn 1101 and the second carbon fiber yarn 1102, the weight of the cable is not greatly increased, the difficulty in transportation and assembly is avoided, the first carbon fiber yarn 1101 and the second carbon fiber yarn 1102 are reinforced by the quartz fiber yarn 1103, and the breaking strength of the carbon fiber yarn in use is reduced;

as shown in fig. 1, 2 and 4, a nylon mesh wrapping layer is arranged in a gap formed between the first conductor 1 and the second conductor 3 and the outer sheath 2, the nylon mesh wrapping layer comprises a nylon mesh wrapping skeleton 6, a first nylon wire 8 is wound on the outer surface of the nylon mesh wrapping skeleton 6, a second nylon wire 9 is wound outside the first nylon wire 8, the first nylon wire 8 and the second nylon wire 9 are wound in a crossed manner, and the second nylon wire 9 is adhered to the inner wall of the outer sheath 2 through resin, namely, the second nylon wire 9 is adhered to the insulating shielding layer 24; when the outer sheath 2 is broken and fractured, the nylon mesh wrapping layer can prevent the first conductor 1 and the second conductor 3 from being directly exposed in the external environment, so that the integral bending strength of the outer sheath 2 is improved.

Claims (10)

1. The winding fracture-resistant high-voltage cable is characterized by comprising an outer sheath (2) and a plurality of conductors sleeved in the outer sheath (2), wherein nylon mesh wrapping layers are arranged in gaps formed by the conductors and the outer sheath (2), each nylon mesh wrapping layer comprises a nylon mesh wrapping framework (6), and a nylon wire layer is wound on the outer surface of each nylon mesh wrapping framework (6);

the outer sheath (2) comprises an insulating shielding layer (24) adhered to and coated outside a nylon wire layer, a second braiding layer (23) is coated on the outer layer of the insulating shielding layer (24), a steel wire layer (22) is coated on the outer surface of the second braiding layer (23), a nylon belt layer (21) is coated on the outer surface of the steel wire layer (22), a conductor shielding layer (20) is coated on the outer surface of the nylon belt layer (21), a first braiding layer (19) is coated on the outer surface of the conductor shielding layer (20), and a wrapping layer (18) is spirally wound on the outer surface of the first braiding layer (19);

the conductor comprises a wire core and a conductor protection sleeve (5) sleeved on the outer surface of the wire core, and an insulating reset filling block (4) attached to the surface of the conductor is filled in a gap formed between adjacent conductors.

2. The wrapped anti-fracture high voltage cable according to claim 1, characterized in that the conductors comprise a first conductor (1) in a central position of the outer jacket (2) and a number of second conductors (3) around the periphery of the first conductor (1);

the insulation reset filling block (4) is filled in a gap between two adjacent second conductors (3).

3. The wound fracture-resistant high voltage cable according to claim 2, wherein the insulating reset filler (4) comprises a nickel alloy filler backbone (26) and an insulating layer wrapped around the outside thereof.

4. A winding fracture-resistant high-voltage cable according to claim 2 or 3, wherein three surfaces of the insulation reset filling block (4) which are clung to the first conductor (1) and the second conductor (3) are of concave arc structures, and one surface of the insulation reset filling block (4) which is clung to the nylon net wrapping framework (6) is of an outer concave arc structure.

5. A wound anti-breaking high voltage cable according to any of claims 1-3, characterized in that the outside of the conductor protective sheath (5) is spirally wound with a non-woven layer (10).

6. The winding fracture-resistant high-voltage cable according to claim 5, wherein the conductor protective sleeve (5) comprises an inner bending-resistant layer (17) coated outside a wire core, an insulating layer (16) is coated outside the inner bending-resistant layer (17), an anti-extrusion fiber (15) is coated outside the insulating layer (16), an anti-bending rib (14) is coated outside the anti-extrusion fiber (15), a copper strip shielding layer (13) is coated outside the anti-bending rib (14), an outer bending-resistant layer (12) is coated outside the copper strip shielding layer (13), and the non-woven fabric layer (10) is wound outside the outer bending-resistant layer (12).

7. The winding fracture-resistant high-voltage cable according to claim 6, wherein a carbon fiber yarn wrapping framework (11) wrapping the outside of the cable core is arranged inside the conductor protective sleeve (5), the carbon fiber yarn wrapping framework (11) comprises a first carbon fiber yarn (1101) and a second carbon fiber yarn (1102) which are clung to each other, the quartz fiber yarn (1103) is spirally wound outside the first carbon fiber yarn (1101) and the second carbon fiber yarn (1102), and the quartz fiber yarn (1103) is clung to the inner bending-resistant layer (17) and the cable core.

8. A wrapped fracture-resistant high voltage cable according to any of claims 1 to 3, wherein the nylon filaments comprise a first nylon filament (8) and a second nylon filament (9) wrapped crosswise around the outer surface of the nylon mesh wrapped skeleton (6).

9. A wound anti-breaking high voltage cable according to claim 2 or 3, characterized in that the first conductor (1), the second conductor (3) and the insulating reset filler (4) are all helically distributed inside the outer sheath (2).

10. A wound anti-breaking high voltage cable according to any of claims 1-3, characterized in that the core is stranded multi-strand copper wire (7).