CN215377049U

CN215377049U - Water-blocking reinforced single-core direct-current power cable

Info

Publication number: CN215377049U
Application number: CN202121499062.3U
Authority: CN
Inventors: 黄桂领; 黄建卫; 张天成; 邱金波
Original assignee: Zhejiang Zetastone Special Cable Co ltd
Current assignee: Zhejiang Zetastone Special Cable Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2021-12-31
Anticipated expiration: 2031-07-02

Abstract

The utility model discloses a water-blocking reinforced single-core direct-current power cable which comprises an inner conductor, wherein an inner semi-conducting layer, an LDPE (low-density polyethylene) insulating layer, an outer semi-conducting layer, a copper-plastic composite tape wrapping layer, a fluororubber moisture-proof layer, a polypropylene moisture absorption layer, a polyester fiber non-woven fabric wrapping layer and a silane grafted crosslinked high-density polyethylene outer sheath are sequentially wrapped outside the inner conductor, the total thickness of the polypropylene moisture absorption layer and the polyester fiber non-woven fabric wrapping layer is 0.2mm to 0.45mm, and the thickness of the silane grafted crosslinked high-density polyethylene outer sheath is not less than 1.6 mm. The cable has the advantages that the water-blocking and moisture-absorbing characteristics are enhanced, the moisture is effectively prevented from permeating into the shielding layer and the insulating layer to be corroded and damaged, the moisture-absorbing layer can disperse absorbed moisture out of the cable in time, the service life of the cable is prolonged, and the durability is better.

Description

Water-blocking reinforced single-core direct-current power cable

Technical Field

The utility model relates to the technical field of cables, in particular to a water-blocking reinforced single-core direct-current power cable.

Background

High-voltage direct-current transmission has many advantages, such as low line cost, low loss, convenient power connection, easy control and the like, and is mainly applied to long-distance large-capacity transmission, power system networking, long-distance submarine cable or large-city underground cable transmission, direct-current transmission of a power distribution network and the like. The high-voltage direct-current power cable has the advantages of high insulating working electric field intensity, light weight, good flexibility, easy installation, small dielectric loss, low conductor loss, large current-carrying capacity, no alternating-current magnetic field and the like. The current direct current power cable tends to be miniaturized and reduced in diameter day by day, and the thickness of an insulating layer needs to be reduced in a key consideration, and meanwhile, the electrical insulation characteristic of the cable needs to be guaranteed. However, when the cable sheath is damaged, the damaged portion is affected with damp water, and the water penetrates into the cable to corrode the shielding layer and damage the insulating layer, so that even though the cable is provided with a general resin waterproof layer, the absorbed water is not easy to diffuse out of the cable, and the resin waterproof layer is degraded, thereby reducing the waterproof performance, shortening the service life of the cable, and having poor durability.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a water-blocking reinforced single-core direct-current power cable, which has the advantages that the water-blocking moisture absorption characteristic is reinforced, the moisture is effectively prevented from permeating into the shielding layer and the insulating layer to be corroded and damaged, the moisture absorption layer can timely disperse the absorbed moisture from the cable, the service life of the cable is prolonged, and the durability is better.

The utility model solves the technical problems through the following technical scheme.

The reinforced single-core direct-current power cable of the water blocking type comprises an inner conductor and is characterized in that an inner semi-conducting layer, an LDPE insulating layer, an outer semi-conducting layer, a copper-plastic composite tape, a fluorine rubber moisture-proof layer, a polypropylene moisture-absorption layer, a polyester fiber non-woven fabric, a winding layer and a silane grafted and crosslinked high-density polyethylene outer sheath are sequentially coated outside the inner conductor, the polypropylene moisture-absorption layer and the polyester fiber non-woven fabric are 0.2mm to 0.45mm in total thickness of the winding layer, and the silane grafted and crosslinked high-density polyethylene outer sheath is not less than 1.6mm in thickness.

Preferably, the inner conductor is formed by concentrically twisting a plurality of strands, and the strands are formed by bundling a plurality of tinned copper monofilaments with the diameter of 0.02mm to 0.1 mm.

Preferably, the LDPE insulating layer has a thickness of 5mm to 22 mm.

Preferably, the inner semiconductive layer and the outer semiconductive layer are each 1mm to 3mm thick.

Preferably, the inner semiconductive layer and the outer semiconductive layer are both polyolefin resin semiconductive layers.

Preferably, the inner semiconductive layer and the outer semiconductive layer are both LDPE, MDPE or HDPE resin semiconductive layers.

Preferably, the copper-plastic composite tape wrapping layer is of a copper-plastic composite tape one-way spiral lapping and covering wrapping structure, and the copper-plastic composite tape comprises a copper foil tape inner layer and a high-density polyethylene film outer layer.

Preferably, the thickness ratio of the outer layer of the high-density polyethylene film to the inner layer of the copper foil strip is 0.85:1 to 1.2: 1.

Preferably, the polypropylene moisture absorption layer is a multi-layer wrapping structure with polypropylene resin tapes.

Preferably, the polyester fiber non-woven fabric wrapping layer is formed by spirally wrapping the polyester fiber non-woven fabric on the polypropylene moisture absorption layer in a unidirectional overlapping manner.

The utility model has the beneficial effects that:

through set up the fluororubber dampproof course around between covering and the oversheath at the copper-plastic composite band, three-layer block water is counted around the covering to polypropylene hygroscopic layer and polyester fiber non-woven fabrics, the moisture absorption, pass through wet composite construction, when the cable oversheath suffers the damage and receives the tide, the aqueous vapor infiltration sees through the polyester fiber non-woven fabrics around the covering can be absorbed by the polypropylene hygroscopic layer, because the fluororubber dampproof course has excellent water blocking characteristic, effectively the separation moisture further to shielding layer and insulating layer diffusion, thereby effectually prevent that shielding layer corruption and insulating layer from taking place the water tree ageing, can see through the polyester fiber non-woven fabrics again around the covering and spill out from the cable oversheath damage, the self-contraction of oversheath damage is restoreed the back, still can continue to use, thereby, the electrical insulation characteristic of cable has been protected, prolong the cable life, durable use more.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram according to an embodiment of the present invention.

In the figure: 1-inner conductor, 2-inner semi-conducting layer, 3-LDPE insulating layer, 4-outer semi-conducting layer, 5-copper-plastic composite tape wrapping layer, 6-fluororubber damp-proof layer, 7-polypropylene moisture absorption layer, 8-polyester fiber non-woven fabric wrapping layer and 9-silane grafted cross-linked high-density polyethylene outer sheath.

Detailed Description

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1, the water-blocking reinforced single-core dc power cable according to the embodiment of the present invention includes an inner conductor 1, and specifically, the inner conductor 1 is formed by concentrically twisting a plurality of strands, and the strands are formed by twisting a plurality of tinned copper monofilament bundles having a diameter of 0.02mm to 0.1 mm.

The outside cladding in proper order of inner conductor 1 has inner semi-conductive layer 2, LDPE insulating layer 3, outer semi-conductive layer 4, copper-plastic composite band around covering 5, fluororubber dampproof course 6, polypropylene hygroscopic layer 7, polyester fiber non-woven fabrics around covering 8 and silane grafting crosslinking high density polyethylene oversheath 9, and specifically speaking, inner semi-conductive layer 2 with outer semi-conductive layer 4 is polyolefin resin semi-conductive layer, is LDPE, MDPE or HDPE resin semi-conductive layer for example, and further, the thickness is 1mm to 3 mm. The LDPE insulating layer 3 preferably has a thickness of 5mm to 22 mm. In one embodiment, the copper-plastic composite tape wrapping layer 5 is a copper-plastic composite tape one-way spiral lapping and wrapping structure, the copper-plastic composite tape comprises a copper foil tape inner layer and a high-density polyethylene film outer layer, and further, the thickness ratio of the high-density polyethylene film outer layer to the copper foil tape inner layer is 0.85:1 to 1.2: 1. In one embodiment, the polypropylene moisture absorption layer 7 is a multi-layer wrapping structure with polypropylene resin tapes. In one embodiment, the polyester fiber non-woven fabric wrapping layer 8 is formed by spirally wrapping a polyester fiber non-woven fabric on the polypropylene moisture absorption layer 7 in a unidirectional manner. The total thickness of the polypropylene moisture absorption layer 7 and the polyester fiber non-woven fabric wrapping layer 8 is 0.2mm to 0.45 mm. The thickness of the silane grafted cross-linked high-density polyethylene outer sheath 9 is not less than 1.6 mm.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The single core direct current power cable of the enhanced type that blocks water, characterized by: including inner conductor (1) and inner conductor (1) outside cladding in proper order has inner semi-conductive layer (2), LDPE insulating layer (3), outer semi-conductive layer (4), copper plastic composite band around covering (5), fluororubber dampproof course (6), polypropylene hygroscopic layer (7), polyester fiber non-woven fabrics around covering (8) and silane grafting crosslinking high density polyethylene oversheath (9), polypropylene hygroscopic layer (7) with polyester fiber non-woven fabrics is 0.2mm to 0.45mm around the totality thickness of covering (8), silane grafting crosslinking high density polyethylene oversheath (9) thickness is not less than 1.6 mm.

2. The water-blocking reinforced single-core direct-current power cable according to claim 1, which is characterized in that: the inner conductor (1) is formed by concentrically twisting a plurality of folded yarns, and the folded yarns are formed by twisting a plurality of tinned copper monofilament bundles with the diameter of 0.02mm to 0.1 mm.

3. The water-blocking reinforced single-core direct-current power cable according to claim 1, which is characterized in that: the thickness of the LDPE insulating layer (3) is 5mm to 22 mm.

4. The water-blocking reinforced single-core direct-current power cable according to claim 1, which is characterized in that: the inner (2) and outer (4) semiconducting layers are each 1 to 3mm thick.

5. The water-blocking reinforced single-core direct-current power cable according to claim 1, which is characterized in that: the inner semiconductive layer (2) and the outer semiconductive layer (4) are both polyolefin resin semiconductive layers.

6. A water-blocking reinforced single core DC power cable according to claim 5, characterized in that: the inner semi-conducting layer (2) and the outer semi-conducting layer (4) are both LDPE, MDPE or HDPE resin semi-conducting layers.

7. The water-blocking reinforced single-core direct-current power cable according to claim 1, which is characterized in that: the copper-plastic composite tape wrapping layer (5) is of a copper-plastic composite tape one-way spiral lapping and covering wrapping structure, and the copper-plastic composite tape comprises a copper foil tape inner layer and a high-density polyethylene film outer layer.

8. A water-blocking reinforced single core DC power cable according to claim 7, characterized in that: the thickness ratio of the outer layer of the high-density polyethylene film to the inner layer of the copper foil strip is 0.85:1 to 1.2: 1.

9. The water-blocking reinforced single-core direct-current power cable according to claim 1, which is characterized in that: the polypropylene moisture absorption layer (7) is of a multi-layer wrapping structure with polypropylene resin tapes.

10. The water-blocking reinforced single-core direct-current power cable according to claim 1, which is characterized in that: the polyester fiber non-woven fabric wrapping layer (8) is formed by lapping and wrapping the polyester fiber non-woven fabric on the polypropylene moisture absorption layer (7) in a unidirectional spiral manner.