CN216849415U

CN216849415U - High-voltage cable

Info

Publication number: CN216849415U
Application number: CN202122801454.7U
Authority: CN
Inventors: 赵健康; 张振鹏; 李文杰; 赵鹏
Original assignee: China Electric Power Research Institute Co Ltd CEPRI
Current assignee: China Electric Power Research Institute Co Ltd CEPRI
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-06-28
Anticipated expiration: 2031-11-16

Abstract

The present invention provides a high voltage cable comprising: the cable comprises a conductor, a conductor shielding layer, an insulating shielding layer, a water-blocking buffer wrapping layer, a metal sleeve layer and an outer sheath layer which are arranged from inside to outside in sequence; and a conductive anticorrosive structure layer is arranged between the water-blocking buffer wrapping layer and the metal sleeve layer and is used for preventing water-blocking powder in the water-blocking buffer wrapping layer from generating electrochemical reaction on the metal sleeve layer. According to the high-voltage cable provided by the utility model, the conductive anticorrosive structure layer is arranged between the water-blocking buffer wrapping layer and the metal sleeve layer, so that on one hand, the resistance difference between the insulation shield and the metal sleeve layer is smoothed, and the influence caused by unqualified water-blocking slow charging resistivity is reduced; on the other hand, the electrochemical reaction of the water-blocking powder in the water-blocking slow-filling belt is effectively inhibited, and the conductive anticorrosive structure layer blocks the contact of the water-blocking powder and the metal sleeve.

Description

High-voltage cable

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a high-voltage cable.

Background

At present, statistics shows that in the running process of a high-voltage cable, the performance of a cable metal sleeve layer is reduced for many times due to a certain reason of a water blocking and slow filling layer of the high-voltage cable, and finally faults such as cable line breakdown and the like are caused. The situation that the wrinkle aluminum sleeve, the semi-conductive buffer layer, the insulation shield and the like near the fault positions are ablated is discovered through anatomy; white powder is separated out from the ablation part, is in a semi-ring shape and is mostly concentrated at the raised part (namely the wave trough position) at the inner side of the lower corrugated aluminum sleeve; the tighter the contact between the corrugated aluminum sleeve and the semiconductive buffer belt is, the more serious the burning loss is, and the less obvious burning points are on the circumferential surface which is not tightly attached to the corrugated aluminum sleeve.

Disclosure of Invention

In view of this, the utility model provides a high-voltage cable, which aims to solve the problem that ablation is easy to occur between a corrugated aluminum sleeve and a semi-conductive buffer strip in the conventional cable.

The utility model provides a high-voltage cable, comprising: the cable comprises a conductor, a conductor shielding layer, an insulating shielding layer, a water-blocking buffer wrapping layer, a metal sleeve layer and an outer sheath layer which are arranged from inside to outside in sequence; wherein the content of the first and second substances,

and a conductive anticorrosive structure layer is arranged between the water-blocking buffer wrapping layer and the metal sleeve layer and is used for preventing water-blocking powder in the water-blocking buffer wrapping layer from generating electrochemical reaction on the metal sleeve layer.

Further, in the high-voltage cable, the thickness of the conductive anti-corrosion structure layer is 0.1-0.3 mm.

Further, in the high-voltage cable, the volume resistivity of the conductive anti-corrosion structure layer is greater than or equal to the volume resistivity of the metal jacket layer and less than or equal to the volume resistivity of the insulating shielding layer, so that resistance transition between the insulating shielding layer and the metal jacket layer is realized.

Further, in the high-voltage cable, the volume resistivity of the conductive anticorrosion structure layer is 200-300 Ω.

Further, in the high-voltage cable, the conductor is divided into four parts of strand blocks insulated from each other, and the strand blocks are separated from each other by insulating paper.

Furthermore, in the high-voltage cable, a plurality of layers of semi-conductive butyl tapes are wound between the conductor water-blocking buffer layer and the conductive anticorrosive structure layer.

Further, in the high-voltage cable, a semi-conductive copper wire braid is wound between the conductive anti-corrosion structure and the metal sleeve layer.

Furthermore, in the high-voltage cable, the insulating layer is provided with a plurality of elastic blocks for improving the anti-seismic performance of the cable.

Further, in the high-voltage cable, the elastic blocks are uniformly distributed in the insulating layer at preset intervals.

Further, in the high-voltage cable, the surface of the outer sheath layer is coated with the microcapsule particle coating.

According to the utility model, the conductive anticorrosive structure layer is arranged between the water-blocking buffer wrapping layer and the metal sleeve layer, so that on one hand, the resistance difference between the insulation shield and the metal sleeve layer is smoothed, and the influence caused by unqualified water-blocking slow charging resistivity is reduced; on the other hand, the electrochemical reaction of the water-blocking powder in the water-blocking slow-filling belt is effectively inhibited, and the conductive anticorrosive structure layer blocks the contact of the water-blocking powder and the metal sleeve.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

Fig. 1 is a schematic structural diagram of a high-voltage cable according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1, a high voltage cable according to an embodiment of the present invention includes: the cable comprises a conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a water-blocking buffer wrapping layer 5, a metal sleeve layer 7 and an outer sheath layer 8 which are arranged from inside to outside in sequence; and a conductive anticorrosive structure layer 6 is arranged between the water blocking buffer wrapping layer 5 and the metal sleeve layer 7 to prevent water blocking powder in the water blocking buffer wrapping layer from generating electrochemical reaction on the metal sleeve layer.

Specifically, the conductor 1 is divided into four parts of strand blocks 11 insulated from each other, and the strand blocks 11 are separated from each other by insulating paper, and the insulating paper is distributed in a cross shape. Therefore, the increase of the alternating current resistance of the conductor 1 caused by the skin effect can be reduced to the maximum extent, the loss and the heat generation of the conductor 1 are effectively reduced, the current-carrying capacity of the conductor 1 is increased, and meanwhile, the processing difficulty is low, and the processing efficiency is favorably improved.

The main component of the conductive anticorrosive structure layer 6 is a mixture of graphene, polyaniline and epoxy resin, has corrosion inertia to water-blocking powder in the cable water-blocking buffer tape, and is not easy to generate electrochemical reaction with the water-blocking powder, wherein the weight ratio of the graphene, the polyaniline and the epoxy emulsion can be 10-15:2-8: 0.5-2.

In this embodiment, the thickness of the conductive anticorrosion structure layer 6 is 0.1mm-0.3mm, preferably 0.25 mm.

In this embodiment, the volume resistivity of the conductive anticorrosion structure layer 6 is greater than or equal to the volume resistivity of the metal jacket layer, and is less than or equal to the volume resistivity (500 Ω. m) of the insulating shielding layer, so as to realize resistance transition between the insulating shielding layer and the metal jacket layer.

Preferably, the volume resistivity of the conductive anti-corrosion structure layer 6 is 200-300 Ω. m, and the resistance transition between the insulating shielding layer and the metal jacket layer can be realized.

Further, a plurality of layers of semi-conductive butyl tapes (not shown in the figure) are wound between the conductor water-blocking buffer layer 5 and the conductive anticorrosive structure layer 6, so as to prevent a gap from being generated between the conductor water-blocking buffer layer 5 and the anticorrosive structure layer 6 due to thermal circulation when a high-voltage cable runs, and further prevent partial discharge. Preferably, the thickness of the semiconductive butyl tape is 0.1mm-0.25mm, and the overlapping rate of every two adjacent semiconductive butyl tapes is 20-30%.

A semi-conductive copper braid (not shown in the figure) is wound between the conductive anti-corrosion structure 5 and the metal jacket layer 7, and the semi-conductive copper braid has good conductivity and is in good electrical contact with the outer jacket layer, so that the electric field intensity can be homogenized, the electric field intensity can be kept equal, and the operation reliability of the high-voltage cable can be improved. Preferably, the thickness of the semi-conductive copper braid is 0.1mm-0.4mm, and the overlapping rate of every two adjacent layers of the semi-conductive copper braid is 5-10%.

In this embodiment, a plurality of elastic blocks 31 are disposed in the insulating layer 3 to increase the shock resistance of the cable. Preferably, the elastic blocks 31 are uniformly distributed in the insulating layer 3 at a predetermined interval. Further preferably, the predetermined distance may be 1/4-1/2 of the thickness of the insulating layer 3.

In this embodiment, the outer sheath layer 8 may be a corrugated aluminum sheath or a smooth aluminum sheath. The outer sheath is coated with a microcapsule particle coating to avoid cable damage caused by biting of small animals on the cable. The main component of the microcapsule particle coating layer is a mixture of an insect repellent and an epoxy resin. The microcapsule particle coating layer in this example is: the insect repellent is prepared into microcapsule particles by utilizing a high-molecular film forming technology, and then the microcapsule particles and epoxy resin are mixed and coated on the outer layer of the protective sleeve.

In conclusion, the high-voltage cable provided by the utility model has the advantages that the conductive anti-corrosion structure layer is arranged between the water-blocking buffer wrapping layer and the metal sleeve layer, so that on one hand, the resistance difference between the insulating shield and the metal sleeve layer is smoothed, and the influence caused by unqualified water-blocking slow charging resistivity is reduced; on the other hand, the electrochemical reaction of the water-blocking powder in the water-blocking slow-filling belt is effectively inhibited, and the conductive anticorrosive structure layer blocks the contact of the water-blocking powder and the metal sleeve.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A high voltage cable, comprising: the cable comprises a conductor, a conductor shielding layer, an insulating shielding layer, a water-blocking buffer wrapping layer, a metal sleeve layer and an outer sheath layer which are arranged from inside to outside in sequence; wherein the content of the first and second substances,

2. The high-voltage cable according to claim 1, wherein the thickness of the conductive corrosion protection structure layer is 0.1-0.3 mm.

3. The high-voltage cable as claimed in claim 1, wherein the volume resistivity of the conductive corrosion protection structure layer is equal to or greater than the volume resistivity of the metal jacket layer and equal to or less than the volume resistivity of the insulation shielding layer, so as to realize resistance transition between the insulation shielding layer and the metal jacket layer.

4. The high-voltage cable as claimed in claim 3, wherein the volume resistivity of the conductive corrosion protection structure layer is 200-300 Ω.

5. The high voltage cable of claim 1, wherein the conductor is divided into four sections of strands insulated from each other, the strands being separated by insulating paper.

6. The high-voltage cable according to claim 1, wherein a plurality of layers of semi-conductive butyl tapes are wound between the water-blocking buffer winding covering and the conductive anti-corrosion structure layer.

7. The high-voltage cable according to claim 1, wherein a semi-conductive copper braid is wound between the conductive corrosion prevention structure and the metal jacket layer.

8. The high voltage cable of claim 1, wherein the insulating layer has a plurality of resilient blocks disposed therein to increase the seismic performance of the cable.

9. The high voltage cable of claim 8, wherein each of the resilient blocks is uniformly distributed in the insulating layer at a predetermined pitch.

10. The high voltage cable of claim 1, wherein the outer jacket layer is surface coated with a coating of microcapsule particles.