Offshore wind farm 35kV collection line power transmission cable and cable lapping apparatus

Abstract

The application relates to the technical field of cables, in particular to a power transmission cable for a 35kV power collection line of an offshore wind farm and a cable lapping device, the power transmission cable comprising a transmission conductor, an insulating layer, a shielding layer, a waterproof layer, an anti-aging layer and a corrosion-resistant layer which are sequentially covered outside the transmission conductor; a spiral groove is arranged on the outer layer of the corrosion-resistant layer and is distributed along the axial direction of the cable body; a sealing lapping ring is adaptively installed on the spiral groove; and the sealing lapping rings on two groups of the power transmission cables are fixed by lapping connection pieces. The sealing lapping ring provided with a ring-shaped sealing baffle, a lapping ring-shaped step and a waterproof ring-shaped step and the lapping connection piece provided with a waterproof clamping groove can realize quick lapping of the cable and guarantee the sealing property; compared with the prior art, the application is fast and convenient to operate, has no safety hazards, is low in manufacturing cost and simple to maintain.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to power transmission cables and cable splicing equipment for 35kV collector lines in offshore wind farms. Background Technology

[0002] Power transmission cables are mainly used in power supply lines for the transmission of high-voltage electrical energy. They carry large currents, and when laying the lines, individual cables need to be connected to form a complete power grid. The outer sheath of the cable is a highly insulating protective layer, and usually a section needs to be cut off to allow the inner conductors to make contact in order for electricity to pass through.

[0003] Existing cable splicing techniques generally use PVC electrical tape to splice power transmission cables. The specific process involves first wrapping the cable with insulating black cloth, then wrapping it with plastic tape, followed by insulating self-adhesive tape, and finally wrapping it with plastic tape again. However, this technique has several drawbacks: the plastic tape is prone to misalignment and separation over time; under heavy electrical loads, the joint heats up, causing the plastic electrical tape to melt and shrink; it is also prone to aging, which can easily lead to short circuits or abnormalities, potentially causing fires. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a power transmission cable and cable splicing equipment for 35kV collector lines in offshore wind farms.

[0005] The technical problem to be solved by this invention is achieved by the following technical solution:

[0006] The power transmission cable for the 35kV collector line of the offshore wind farm includes a transmission conductor, an insulation layer, a shielding layer, a waterproof layer, an anti-aging layer, and a corrosion-resistant layer that are sequentially wrapped around the transmission conductor.

[0007] The outer surface of the corrosion-resistant layer is provided with spiral grooves distributed along the axial direction of the cable body. Sealing overlap rings are adapted to be installed on the spiral grooves. The sealing overlap rings on two identical sets of power transmission cables are sealed and fixed by overlap connecting pieces.

[0008] Preferably, an annular sealing retaining ring is provided on the inner ring wall of the sealing overlap ring.

[0009] Preferably, the sealing overlap ring has a rotating annular step on its surface.

[0010] Preferably, the sealing overlap ring has an overlap annular step on its surface.

[0011] Preferably, a first overlapping threaded hole is provided at a symmetrical position on the overlapping annular step.

[0012] Preferably, the lap joint piece is provided with a second lap joint threaded hole that matches the position and size of the first lap joint threaded hole.

[0013] Preferably, the end ring surface of the sealing overlap ring is provided with a waterproof annular step with a funnel-shaped structure.

[0014] Preferably, the inner wall of the overlapping connecting piece is provided with a waterproof groove that matches the outer dimensions of the waterproof annular step.

[0015] Preferably, the overlapping connecting piece has an arc-shaped plate structure.

[0016] A splicing device for 35kV power transmission cables for offshore wind farms is used to splice the aforementioned 35kV power transmission cables for offshore wind farms. It includes a splicing platform, two symmetrically arranged grooves on the splicing platform, a bidirectional threaded rod arranged horizontally at the bottom of the splicing platform, and two sliding blocks correspondingly slidable within the two grooves and connected at their bottoms to the bidirectional threaded rod. One end of the bidirectional threaded rod is connected to a rotating handwheel. Each of the two sliding blocks is equipped with a positioning pin and two supporting inclined blocks symmetrically distributed longitudinally along the positioning pin. A protective railing is provided on the rear side of the splicing platform.

[0017] The beneficial effects of this invention are:

[0018] This invention, by setting a sealing overlap ring with an annular sealing retainer, an overlapping annular step, and a waterproof annular step, and an overlap connecting piece with a waterproof groove, can achieve rapid cable overlap while ensuring sealing. Compared with the prior art, this invention is quick and convenient to operate, has no safety hazards, and has low manufacturing cost and simple maintenance. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the overall structure of the cable in this invention;

[0021] Figure 2 This is a schematic diagram of the cable body structure in this invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the sealing overlap ring from the front view in this invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the sealing overlap ring from the front view in this invention;

[0024] Figure 5 This is a schematic cross-sectional view of the sealing overlap ring in this invention;

[0025] Figure 6 This is a schematic diagram of the overlapping connecting piece in this invention;

[0026] Figure 7 This is a top-down view of the structure of the overlapping device in this invention;

[0027] Figure 8 This is a schematic diagram of the overlapping device in this invention from an overhead view.

[0028] Figure 9 This is a structural diagram of the cable after splicing in this invention.

[0029] In the diagram: 1. Transmission conductor; 2. Insulation layer; 3. Shielding layer; 4. Waterproof layer; 5. Anti-aging layer; 6. Corrosion-resistant layer; 7. Spiral groove; 8. Sealing overlap ring; 81. Annular sealing retaining ring; 82. Rotating annular step; 83. Overlapping annular step; 84. Waterproof annular step; 9. First overlap threaded hole; 10. Overlap connecting piece; 101. Second overlap threaded hole; 102. Waterproof slot; 11. Overlap platform; 12. Slide groove; 13. Bidirectional lead screw; 14. Slide seat; 15. Rotating handwheel; 16. Positioning pin; 17. Supporting inclined block; 18. Guardrail. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] like Figures 1 to 6 As shown, the power transmission cable for a 35kV collector line in an offshore wind farm includes a transmission conductor 1, an insulation layer 2, a shielding layer 3, a waterproof layer 4, an anti-aging layer 5, and a corrosion-resistant layer 6 sequentially wrapped around the transmission conductor 1. The outer surface of the corrosion-resistant layer 6 has spiral grooves 7 distributed along the axial direction of the cable body. Sealing overlap rings 8 are fitted onto the spiral grooves 7. Sealing overlap rings 8 on two identical sets of power transmission cables are sealed and fixed together by overlap connecting pieces 10.

[0032] Specifically, the inner ring wall of the sealing overlap ring 8 is provided with a threaded groove that matches the spiral groove 7, so that the sealing overlap ring 8 can be screwed into and installed on the cable body; an annular sealing retainer ring 81 is provided on the inner ring wall of the sealing overlap ring 8, the inner diameter of the annular sealing retainer ring 81 is smaller than the outer diameter of the corrosion-resistant layer 6. The annular sealing retainer ring 81 serves two purposes: firstly, it provides a positioning function, that is, when the annular sealing retainer ring 81 is in contact with the corrosion-resistant layer 6 during the screwing into the cable body, it indicates that the sealing overlap ring 8 is screwed into place; secondly, after the annular sealing retainer ring 81 is in contact with the corrosion-resistant layer 6, it also provides a sealing and waterproof function.

[0033] As a further improvement of this embodiment, a rotating annular step 82 is provided on the annular surface of the sealing overlap ring 8. The rotating annular step 82 is used by the operator to rotate the sealing overlap ring 8. Therefore, the surface roughness of the rotating annular step 82 is greater than that of other locations on the sealing overlap ring 8.

[0034] As a further improvement to this embodiment, the sealing overlap ring 8 is provided with an overlap annular step 83 on its annular surface. The outer diameter of the overlap annular step 83 is the same as the inner diameter of the overlap connecting piece 10.

[0035] The overlapping annular step 83 has a first overlapping threaded hole 9 at a symmetrical position, and the overlapping connecting piece 10 has a second overlapping threaded hole 101 that matches the position and size of the first overlapping threaded hole 9. During overlapping, it is fixed by bolts, which has the characteristics of convenient and quick overlapping.

[0036] As a further improvement to this embodiment, a waterproof annular step 84 with a trumpet-shaped structure is provided on the end ring surface of the sealing overlap ring 8. The waterproof annular step 84 is connected to the overlap annular step 83, and a waterproof groove 102 adapted to the outer dimensions of the waterproof annular step 84 is provided on the inner wall of the overlap connecting piece 10. Through the waterproof annular step 84 and the waterproof groove 102, it can be ensured that external rainwater or seawater cannot enter the cable from the overlap end face of the sealing overlap ring 8.

[0037] As a further improvement to this embodiment, the overlapping connecting piece 10 has an arc-shaped plate structure.

[0038] like Figures 7 to 8 As shown, the power transmission cable splicing equipment for 35kV collector lines in offshore wind farms is used to splice the aforementioned power transmission cables for 35kV collector lines in offshore wind farms. It includes a splicing platform 11, two sliding grooves 12 symmetrically arranged laterally on the splicing platform 11, a bidirectional screw rod 13 arranged laterally at the bottom of the splicing platform 11, and two sliding seats 14 correspondingly slidably mounted in the two sliding grooves 12 and connected at their bottoms to the bidirectional screw rod 13. One end of the bidirectional screw rod 13 is connected to a rotating handwheel 15. Each of the two sliding seats 14 is provided with a positioning pin 16 and two supporting inclined blocks 17 symmetrically distributed longitudinally along the positioning pin 16. A guardrail 18 is provided on the rear side of the splicing platform 11.

[0039] In use, first screw the sealing overlap ring 8 onto the cable body, ensuring it is fully screwed in. Prepare two sets of cables with sealing overlap rings 8. Next, fix any one of the first overlap threaded holes 9 on the overlap ring step 83 onto the positioning pin 16. At this time, the other first overlap threaded hole 9 on the overlap ring step 83 is located directly above. Simultaneously, make the rotating ring step 82 fit against the supporting inclined block 17. Then, rotate the double-acting screw 13 by turning the handwheel 15, causing the two slides 14 to move towards the center, thereby making the end faces of the two sealing overlap rings 8 fit together. Next, install the overlap connecting piece 10 onto the two sealing overlap rings 8, ensuring the overlap connecting piece 10 fits properly. The waterproof slot 102 on the 0 engages with the two waterproof annular steps 84 on the two sealing overlap rings 8. The inner wall of the overlap connecting piece 10 fits against the overlap annular steps 83 on the two sealing overlap rings 8. The two second overlap threaded holes 101 on the overlap connecting piece 10 correspond vertically to the first overlap threaded holes 9 on the two sealing overlap rings 8. Then, screw in the bolts to fix it. After the first overlap connecting piece 10 is fixed, remove the two sets of cables from the positioning pin 16 and the support inclined block 17, and then install the other overlap connecting piece 10. When installing the other overlap connecting piece 10, it is not necessary to place it on the slide block 14 again. The cable after the overlap is finally completed is as follows: Figure 9 As shown.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A 35kV power transmission cable for offshore wind farm collector lines, comprising a transmission conductor (1), an insulation layer (2), a shielding layer (3), a waterproof layer (4), an anti-aging layer (5), and a corrosion-resistant layer (6) sequentially wrapped around the transmission conductor (1); characterized in that: The outer surface of the corrosion-resistant layer (6) is provided with spiral grooves (7) distributed along the axial direction of the cable body. A sealing overlap ring (8) is adapted to be installed on the spiral groove (7). The sealing overlap rings (8) on the same two sets of power transmission cables are sealed and fixed by the overlap connecting piece (10). The inner ring wall of the sealing overlap ring (8) is provided with an annular sealing retainer ring (81). The inner diameter of the annular sealing retainer ring (81) is smaller than the outer diameter of the corrosion-resistant layer (6). When the sealing overlap ring (8) is screwed into the cable body, when the annular sealing retainer ring (81) is in contact with the corrosion-resistant layer (6), it indicates that the sealing overlap ring (8) has been screwed into place and a seal has been achieved. The sealing overlap ring (8) has a rotating annular step (82) on its ring surface. The sealing lap ring (8) has an lap ring step (83) on its ring surface. A first lap threaded hole (9) is provided at a symmetrical position on the lap ring step (83). A second lap threaded hole (101) is provided on the lap connecting piece (10) that matches the position and size of the first lap threaded hole (9). The sealing overlap ring (8) has a waterproof annular step (84) with a trumpet-shaped structure on its end ring surface, and the inner wall of the overlap connecting piece (10) has a waterproof groove (102) that matches the outer dimensions of the waterproof annular step (84).

2. The power transmission cable for a 35kV collector line in an offshore wind farm according to claim 1, characterized in that: The overlapping connecting piece (10) has an arc-shaped plate structure.

3. A power transmission cable splicing device for 35kV collector lines in offshore wind farms, characterized in that: The cable for splicing the 35kV collector line of the offshore wind farm as described in any one of claims 1 to 2 includes a splicing platform (11), two grooves (12) symmetrically arranged in the transverse direction on the splicing platform (11), a bidirectional screw rod (13) arranged in the transverse direction at the bottom of the splicing platform (11), and two slide seats (14) correspondingly slidably mounted in the two grooves (12) and correspondingly connected to the bottom of the bidirectional screw rod (13). One end of the bidirectional screw rod (13) is connected to a rotating handwheel (15). Each of the two slide seats (14) is provided with a positioning pin (16) and two supporting inclined blocks (17) symmetrically distributed in the longitudinal direction along the positioning pin (16). A guardrail (18) is provided on the rear side of the splicing platform (11).

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