AU2020334655A1

AU2020334655A1 - Cable

Info

Publication number: AU2020334655A1
Application number: AU2020334655A
Authority: AU
Inventors: Hongxiang CAI; Siwei CONG; Changqi FU; Hongjian HOU; Hao Qian; Yunhai XIA; Shuhong XIE; Jianmin Zhang; Yujun ZHOU
Original assignee: Zhongtian Technology Submarine Cable Co Ltd
Current assignee: Zhongtian Technology Submarine Cable Co Ltd
Priority date: 2019-08-21
Filing date: 2020-06-22
Publication date: 2022-03-31
Anticipated expiration: 2040-06-22
Also published as: AU2020334655B2; WO2021031684A1; CN112420267A

Abstract

A power cable comprises at least three cable cores, and a filler layer, a waterproof layer, a composite layer, and an outer sheath sequentially wrapped around the outside of the at least three cable cores. Each of the cable cores comprises a waterproof conductor, a conductor shield layer, an insulation layer, an insulation shield layer, a first waterproof tape, a shield layer, a second waterproof tape, a first composite tape, and a first protection sheath that are sequentially disposed and wrapped from an inner side to an outer side. The first protection sheath is tangential to the filler layer, outer sides of the at least three cable cores are arranged in a tangential manner to form an accommodation space, and a waterproof filler strand is filled in the accommodation space. The power cable provided by the present invention is waterproofed in each layer from the outer protection sheath to the inner waterproof conductor, thereby providing improved waterproof performance, preventing water ingress to the power cable in a longitudinal or radial direction in a comprehensive and effective manner, and ensuring operational safety of the power cable.

Description

POWER CABLE TECHNICAL FIELD

[0001] The present invention relates to the manufacturing field of wires and cables, and

more particularly to, a cable.

BACKGROUND

[0002] Due to construction needs, some cables need to be laid in water for a long time. Thus, if the waterproof effect of the cable is not good, the water vapor is easy to produce

water tree on the insulation during the long-term operation of the cable, and then cause

breakdown of the insulation. The existence of moisture greatly reduces the service life of the

cable. Therefore, for this laying environment, the cable must have extremely high waterproof

performance. Common three-core waterproof cable can only longitudinally block water for

the conductor and each layer but cannot radially block water. At the same time, due to a large

lap when cabling, the filler used cannot effectively prevent longitudinal intrusion of water,

and the sheath material used cannot effectively prevent radial intrusion of water.

SUMMARY

[0003] In view of this, it is necessary to provide a cable that can effectively prevent

intrusion of water.

[0004] A cable includes at least three cable cores, and a filling layer, a waterproof layer, a

composite layer and an outer sheath that are sequentially wrapped around outsides of the at

least three cable cores, where each cable core includes a waterproof conductor, a conductor

shield layer, an insulation layer, an insulation shield layer, a first waterproof tape, a shield

layer, a second waterproof tape, a first composite tape, and a first sheath that are sequentially

disposed and wrapped from an inner side to an outer side, the first sheath is tangential to the filling layer, the outsides of the at least three cable cores are arranged in a tangential manner to form an accommodation space, and the accommodation space is filled with a waterproof filling strand.

[0005] Further, the waterproof conductor includes a central conductor and a plurality of

outer conductor layers that are sequentially twisted with the central conductor as an axis, and

each outer conductor layer is composed by twisting a plurality of conductors with the central

conductor as the axis.

[0006] Further, a semiconducting waterproof tape is arranged between the central

conductor and each outer conductor layer to prevent water from longitudinally intruding into

the waterproof conductor.

[0007] Further, the conductor shield layer uses a semiconducting material to extrude and wrap the waterproof conductor.

[0008] Further, the insulation layer uses a cross-linked polyethylene material to evenly extrude and wrap the conductor shield layer.

[0009] Further, the insulation shield layer includes an insulation wire core and a

semiconducting layer, the semiconducting layer directly extrudes and wraps an outer surface

of each insulation wire core and is closely combined with or peelable from the insulation wire

core.

[0010] Further, the first sheath, the filling layer, and the outer sheath are made of a polyethylene material.

[0011] Further, the shield layer is a copper wire shield layer.

[0012] Further, the composite layer is an aluminum-plastic composite tape or a lead

sheath.

[0013] Further, both the first waterproof tape and the second waterproof tape are a

double-sided semiconducting waterproof tape.

[0014] Compared with the prior art, the above cable includes at least three cable cores,

and a filing layer, a waterproof layer, a composite layer, and an outer sheath that are

sequentially wrapped around the outsides of the at least three cable cores, where each layer,

from the external outer sheath to the internal waterproof conductor, is waterproof, has a better

waterproof performance, prevents water from intruding into the cable longitudinally and radially in a multiple-layer and efficient manner, and ensures an operation safety of the cable.

BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a structural diagram of a cable in an embodiment of the present invention.

[0016] Description of reference signs of main members

[0017] Cable 100 Cable core 10 Waterproof conductor 11 Conductor shield layer 12 Insulation layer 13 Insulation shield layer 14 First waterproof tape 15 Shield layer 16 Second waterproof tape 17 First composite tape 18 First sheath 19 Waterproof filling strand 101 Filling layer 20 Filler 21 Waterproof layer 30 Composite layer 40 Outer sheath 50

[0018] The following specific embodiments will further explain the present invention in

combination with the above drawing.

DESCRIPTION OF EMBODIMENTS

[0019] The technical solutions in the embodiments of the present invention will be clearly

and completely described below in combination with the attached drawing in the

a embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all embodiments.

[0020] It should be noted that when a component is described as "fixed to" another component, the component can be directly on another component or there exists an intermediate component. When a component is considered to "connect to" another component, the component can be directly connected to another component or there be existed an intermediate component at the same time. When a component is considered to be "fixed to" another component, the component can be directly fixed to the another component or there is existed an intermediate component therebetween.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art of the present invention. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the preset invention. The term "or/and" as used herein includes any and all combinations of one or more related listed items.

[0022] Referring to FIG. 1, the cable 100 shown in FIG. 1 is used for power transmission. The cable 100 includes at least three cable cores 10, and a filling layer 20, a waterproof layer 30, a composite layer 40, and an outer sheath 50 that are sequentially wrapped around the outsides of the at least three cable cores 10.

[0023] Each cable core 10 includes a waterproof conductor 11 and a conductor shield layer 12 sleeved on the outside of the waterproof conductor 11. The waterproof conductor 11 includes a central conductor (not shown) and a plurality of outer conductor layers (not shown) that are sequentially twisted with the central conductor as the axis. Each outer conductor layer is formed by twisting a plurality of conductors with the central conductor as the axis, and a semiconducting waterproof tape is arranged between the central conductor and each outer conductor layer, so as to effectively prevent longitudinal intrusion of water into the waterproof conductor 11. The conductor shield layer 12 uses a semiconducting material to extrude and wrap the waterproof conductor so as to prevent partial discharge of the waterproof conductor 11. The outside of the conductor shield layer 12 is sleeved with an insulation layer 13, the insulation layer 13 has an insulation effect. In one embodiment, the

A insulation layer 13 uses a cross-linked polyethylene material to evenly extrude and wrap the conductor shield layer 12. The outside of the insulation layer 13 is sleeved with an insulation shield layer 14. In one embodiment, the insulation shield layer 14 includes an insulation wire core and a semiconducting layer, the semiconducting layer directly extrudes and wraps the outer surface of each insulation wire core and is closely combined with or peelable from the insulation wire core. The outside of the insulation shield layer 14 is wrapped with a first waterproof tape 15, the outside of the first waterproof tape 15 is wrapped with a shield layer

16, and the outside of the shield layer 16 is wrapped with a second waterproof tape 17. In one

embodiment, the shield layer 16 is a copper wire shield layer, and the first waterproof tape 15

and the second waterproof tape 17 are double-sided semiconducting waterproof tapes. The

first waterproof tape 15 and the second waterproof tape 17 expand when encountering water,

so as to effectively prevent water from longitudinally intruding into the interior of the cable

100 along a gap that is between the copper wires. The outside of the second waterproof tape

17 is wrapped with a first composite tape 18. The first composite tape 18 can assist the shield

layer 16 to carry a part of short-circuit current, and can effectively prevent intrusion of water

in a radial direction of the cable 100. In one embodiment, the first composite tape 18 may be

an aluminum-plastic composite tape or a lead sheath. The outside of the first composite tape

18 is sleeved with a first sheath 19, the first sheath 19 is tangential to the filling layer 20 to

block water. In one embodiment, the first sheath 19 is made of a polyethylene material, the

polyethylene material has strong waterproof performance and can effectively prevent radial

intrusion of water.

[0024] The cable cores 10 further include a waterproof filling strand 101, the outsides of

the at least three cable cores are arranged in a tangential manner to form an accommodation

space (not labeled), and the waterproof filling strand 101 is filled in the accommodation

space. The waterproof filling strand 101 expands rapidly when encountering water, so as to

prevent longitudinal intrusion of water into the cable cores 10. In one embodiment, the

number of the cable cores 10 is three, and the cross sections of the three cable cores 10 are

arranged in a tangential manner, and the gap formed by the tangency of the three cable cores

10 is filled with the waterproof filling strand 101.

[0025] The filling layer 20 is sleeved on the outsides of the cable cores 10. In one

I: embodiment, the filling layer 20 is produced by die extrusion using a polyethylene material.

The gaps formed by the filling layer 20 and the cable cores 10 are provided with a filler 21. In

one embodiment, the filler 21 is integrated with the filling layer 20 and is made of a

polyethylene material. The polyethylene material itself has high compactness and has strong

waterproof performance, and can prevent longitudinal and radial intrusion of water.

[0026] The waterproof layer 30 is sleeved on the outside of the filling layer 20. In one

embodiment, the waterproof layer 30 is wrapped around the outer layer of the filling layer 20

using a double-sided insulation waterproof tape. The waterproof layer 30 expands when

encountering water, thereby effectively preventing water from longitudinally intruding into

the cable 100.

[0027] The composite layer 40 is sleeved on the outside of the waterproof layer 30. When the cable 100 is damaged by an external force, the composite layer 40 can prevent external

moisture from radially intruding into the cable. In one embodiment, the composite layer 40 is

a lead sheath, the lead sheath has high compactness, can effectively prevent radial intrusion of

water, and can also carry a part of the short-circuit current. In other embodiments, the

composite layer 40 may also be an aluminum-plastic composite tape.

[0028] The outer sheath 50 is sleeved on the outside of the composite layer 40. In one

embodiment, the outer sheath 50 is made of a polyethylene material. The polyethylene

material is hard and is not easy to be broken during construction. At the same time, the

polyethylene itself has good waterproof effect, and can effectively preventing water from

radially intruding into the cable 100.

[0029] When the cable 100 is in use, the waterproof conductor 11, the first waterproof

tape 15, the second waterproof tape 17, the first composite tape 18, the first sheath 19, the

filling layer 20, the waterproof filling strand 101, the waterproof layer 30, the composite layer

40, and the outer sheath 50 all have waterproof performance, that is, from the external outer

sheath 50 to the inner waterproof conductor 11, there are multiple-layer waterproof

performance, so as to provide multiple-layer protection for the cable 100. At the same time,

the gaps of the plurality of cable cores 10 are filled with the waterproof filling strand 101 by

extrusion process, which solves the problems of large gaps when cabling and poor waterproof

effect.

[0030] Each layer of the above cable 100, from the external outer sheath 50 to the internal waterproof conductor 11, can block water, has a better water blocking performance, can

prevent water from intruding into the cable longitudinally and radially in a multiple-layer and

efficient manner, and ensures the operation safety of the cable.

[0031] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, not to limit the present invention. Any appropriate

modifications and changes to the above embodiments made within the substantive spirit of the

present invention fall within the scope protected by the present invention.

Claims

1. A cable, comprising at least three cable cores, and a filling layer, a waterproof layer,

a composite layer, and an outer sheath that are sequentially wrapped around outsides of the at

least three cable cores, wherein each cable core comprises a waterproof conductor, a

conductor shield layer, an insulation layer, an insulation shield layer, a first waterproof tape, a

shield layer, a second waterproof tape, a first composite tape, and a first sheath that are

sequentially disposed and wrapped from an inner side to an outer side, the first sheath is

tangential to the filling layer, the outsides of the at least three cable cores are arranged in a

tangential manner to form an accommodation space, and the accommodation space is filled

with a waterproof filling strand.

2. The cable according to claim 1, wherein the waterproof conductor comprises a central

conductor and a plurality of outer conductor layers that are sequentially twisted with the

central conductor as an axis, and each outer conductor layer is composed by twisting a

plurality of conductors with the central conductor as the axis.

3. The cable according to claim 2, wherein a semiconducting waterproof tape is arranged

between the central conductor and each outer conductor layer to prevent water from

longitudinally intruding into the waterproof conductor.

4. The cable according to claim 1, wherein the conductor shield layer uses a

semiconducting material to extrude and wrap the waterproof conductor.

5. The cable according to claim 1, wherein the insulation layer uses a cross-linked

polyethylene material to evenly extrude and wrap the conductor shield layer.

6. The cable according to claim 1, wherein the insulation shield layer comprises an

insulation wire core and a semiconducting layer, the semiconducting layer directly extrudes

and wraps an outer surface of each insulation wire core and is closely combined with or

peelable from the insulation wire core.

7. The cable according to claim 1, wherein the first sheath, the filling layer, and the outer

sheath are made of a polyethylene material.

8. The cable according to claim 1, wherein the shield layer is a copper wire shield layer.

Q

9. The cable according to claim 1, wherein the composite layer is an aluminum-plastic

composite tape or a lead sheath.

10. The cable according to claim 1, wherein both the first waterproof tape and the second

waterproof tape are a double-sided semiconducting waterproof tape.