Medium-voltage trailing cable and design method thereof

Abstract

The invention belongs to the technical field of medium-voltage power cables, and provides a medium-voltage trailing cable and a design method thereof.The medium-voltage trailing cable comprises a plurality of main wire cores, a plurality of ground wire cores and a cable core wrapping tape layer arranged outside the main wire cores and the ground wire cores; the main wire braided reinforcing layer is arranged between the wrapping tape layer of the main wire core and the main wire conductor shielding layer, and the ground wire braided reinforcing layer is arranged between the ground wire wrapping tape layer of the ground wire core and the ground wire extruded layer, so that the tensile capacity of the main wire core and the ground wire core can be improved; the problem that shielding layers, insulating layers and the like on the main wire cores and the ground wire cores are damaged is avoided; moreover, the main wire braided reinforcing layer is embedded into the main wire conductor shielding layer, and the ground wire braided reinforcing layer is embedded into the ground wire extruded layer, so that the braided reinforcing layers are integrated with the main wire conductor shielding layer and the ground wire extruded layer respectively, and the overall tensile strength of the main wire conductor shielding layer and the ground wire extruded layer is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of medium-voltage power cables, and in particular relates to a medium-voltage trailing cable and a design method thereof. Background Art

[0002] In specific industrial environments such as mines, ports, and construction sites, equipment needs to be moved frequently, which requires cables to have good drag performance. Currently, medium-voltage cables on the market have deficiencies in drag performance, such as easy wear, insufficient tensile strength, and poor flexibility, which not only shortens the service life of the cables, but may also lead to safety hazards.

[0003] The current medium-voltage towing cable improves its tensile and wear-resistant properties by arranging a wrapping layer, an inner sheath layer, a fiber braided reinforcement layer and an outer sheath layer outside the cable core; however, although the fiber braided reinforcement layer, which mainly resists tensile and torsional forces, avoids the overall damage of the cable, the shielding layer and the insulation layer on the main line core and the ground wire core inside are prone to damage during the continuous dragging process, causing short circuits and leakage. Moreover, blindly adding fiber braided reinforcement layers and outer sheath layers will inevitably increase the diameter of the cable, affecting the transportation and use of the cable. Summary of the invention

[0004] In order to solve the above-mentioned problems, the present invention proposes a medium-voltage trailing cable and a design method thereof, wherein a main line braided reinforcement layer is arranged between the tape layer of the main line core and the main line conductor shielding layer, and a ground wire braided reinforcement layer is arranged between the ground wire tape layer and the ground wire extruded layer of the ground wire core, thereby improving the tensile strength of the main line core and the ground wire core, and avoiding the problem of damage to the shielding layer and the insulating layer on the main line core and the ground wire core; in addition, the main line braided reinforcement layer is embedded in the main line conductor shielding layer, and the ground wire braided reinforcement layer is embedded in the ground wire extruded layer, so that the braided reinforcement layer is respectively integrated with the main line conductor shielding layer and the ground wire extruded layer, thereby improving the overall tensile strength of the main line conductor shielding layer and the ground wire extruded layer.

[0005] In order to achieve the above objectives, in a first aspect, the present invention provides a medium voltage trailing cable, which adopts the following technical solution:

[0006] A medium voltage trailing cable comprises a plurality of main line cores and a plurality of ground line cores, and a cable core wrapping tape layer arranged outside the plurality of main line cores and the plurality of ground line cores;

[0007] The main line core includes a main line conductor, and a main line tape layer, a main line braided reinforcement layer and a main line conductor shielding layer sequentially arranged outside the main line conductor; the ground line core includes a ground line conductor, and a ground line tape layer, a ground line braided reinforcement layer and a ground line extruded layer sequentially arranged outside the ground line conductor;

[0008] The main line braided reinforcement layer is embedded in the main line conductor shielding layer, and the ground line braided reinforcement layer is embedded in the ground line extruded layer.

[0009] Furthermore, a cable core braided reinforcement layer and a sheath layer are sequentially arranged outside the cable core tape layer.

[0010] Furthermore, the cable core braided reinforcement layer is embedded in the sheath layer.

[0011] Furthermore, the main line braided reinforcement layer, the ground line braided reinforcement layer and the cable core braided reinforcement layer all include a mesh structure and a plurality of radial embedded columns vertically arranged on the mesh structure; the radial embedded columns are in an inverted cone shape.

[0012] Furthermore, the thicknesses of the main line conductor shielding layer, the ground wire extruded layer and the sheath layer are adjusted according to the number of radially embedded columns.

[0013] Furthermore, the sheath layer is made of chlorinated polyethylene rubber material.

[0014] Furthermore, a main line insulation layer and a main line insulation ring shielding layer are sequentially arranged outside the main line conductor shielding layer.

[0015] Furthermore, the main line braided reinforcement layer is a semi-conductive fiber braided structure; the main line conductor shielding layer is a semi-conductive rubber extruded structure; the main line insulation layer is an EPDM insulation extruded structure; and the main line insulation ring shielding layer is a semi-conductive rubber extruded structure.

[0016] Furthermore, a plurality of main line cores and a plurality of ground line cores are twisted together.

[0017] In order to achieve the above object, in a second aspect, the present invention further provides a method for designing a medium voltage trailing cable, which adopts the following technical solution:

[0018] A method for designing a medium-voltage trailing cable is used to design a medium-voltage trailing cable as described in the second aspect, comprising: arranging the main line braided reinforcement layer between the main line tape layer and the main line conductor shielding layer, and arranging the ground wire braided reinforcement layer between the ground wire tape layer and the ground wire extruded layer.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, a main line braided reinforcement layer is arranged between the tape layer of the main line core and the main line conductor shielding layer, and a ground wire braided reinforcement layer is arranged between the ground wire tape layer and the ground wire extruded layer of the ground wire core, which can improve the tensile strength of the main line core and the ground wire core, and avoid the problem of damage to the shielding layer and the insulation layer on the main line core and the ground wire core; and the main line braided reinforcement layer is embedded in the main line conductor shielding layer, and the ground wire braided reinforcement layer is embedded in the ground wire extruded layer, so that the braided reinforcement layer is respectively integrated with the main line conductor shielding layer and the ground wire extruded layer, thereby improving the overall tensile strength of the main line conductor shielding layer and the ground wire extruded layer.

[0021] 2. In the present invention, the cable core braided reinforcement layer is embedded in the sheath layer, so that the cable core braided reinforcement layer and the sheath layer are integrated, which not only maintains the softness and elasticity of the rubber sheath, but also improves the overall tensile strength of the cable sheath layer.

[0022] 3. In the present invention, a plurality of radial embedded columns are vertically arranged on the braided reinforcement layer, and the radial embedded columns are in an inverted cone shape. Through the arrangement of the inverted cone-shaped radial embedded columns, the connection strength between the braided reinforcement layer and the main line conductor shielding layer, the ground wire extruded layer and the sheath layer is enhanced, and the tensile strength is further improved; and the connection strength between the main line conductor shielding layer, the ground wire extruded layer and the sheath layer is enhanced, and is adjusted according to the number of radial embedded columns. On the basis of meeting the tensile strength, the increase in cable diameter is avoided, and the transportation and use of the cable will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0024] Figure 1 This is a schematic diagram of the cable structure of Example 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of a braided reinforcement layer according to Embodiment 1 of the present invention;

[0026] Figure 3 This is a schematic diagram of a radial embedded column according to Example 1 of the present invention;

[0027] Among them, 1. Main line core; 11. Main line conductor; 12. Main line tape layer; 13. Main line braided reinforcement layer; 1301. Mesh structure; 1302. Radial embedded column; 14. Main line conductor shielding layer; 15. Main line insulation layer; 16. Main line insulation ring shielding layer; 2. Multiple ground wire cores; 21. Ground wire conductor; 22. Ground wire tape layer; 23. Ground wire braided reinforcement layer; 24. Ground wire extruded layer; 3. Cable core tape layer; 4. Cable core braided reinforcement layer; 5. Sheath layer. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0030] Embodiment 1:

[0031] With the development of technology and time, in addition to power supply, medium-voltage towing cables have put forward higher and more reliable requirements for the tensile and wear resistance of power supply cables for electric shovels and other power supply cables, requiring products with better cost performance. The current medium-voltage towing cables have improved tensile and wear resistance properties by setting a wrapping layer, an inner sheath layer, a fiber braided reinforcement layer and an outer sheath layer outside the cable core; however, during the continuous towing process, the shielding layer and insulation layer on the main line core and the ground wire core inside are still prone to damage, causing short circuits and leakage. In addition, blindly adding fiber braided reinforcement layers and outer sheath layers will inevitably increase the diameter of the cable, affecting the transportation and use of the cable.

[0032] In order to solve the above problems, Figure 1 As shown, this embodiment provides a medium voltage trailing cable, comprising a plurality of main line cores 1 and a plurality of ground line cores 2, and a cable core tape layer 3 arranged outside the plurality of main line cores 1 and the plurality of ground line cores 2;

[0033] The main line core 1 includes a main line conductor 11, and a main line tape layer 12, a main line braided reinforcement layer 13 and a main line conductor shielding layer 14 which are sequentially arranged outside the main line conductor 11; the ground wire core 2 includes a ground wire conductor 21, and a ground wire tape layer 22, a ground wire braided reinforcement layer 23 and a ground wire extruded layer 24 which are sequentially arranged outside the ground wire conductor 21;

[0034] The main line braided reinforcement layer 13 is embedded in the main line conductor shielding layer 14 , and the ground line braided reinforcement layer 23 is embedded in the ground line extruded layer 24 .

[0035] Specifically, a main line braided reinforcement layer 13 is arranged between the main line tape layer 12 and the main line conductor shielding layer 14 of the main line core 1, and a ground wire braided reinforcement layer 23 is arranged between the ground wire tape layer 22 and the ground wire extruded layer 24 of the ground wire core 2, which can improve the tensile strength of the main line core 1 and the ground wire core 2 and avoid the problem of damage to the shielding layer and the insulation layer on the main line core 1 and the ground wire core 2; in addition, the main line braided reinforcement layer 13 is embedded in the main line conductor shielding layer 14, and the ground wire braided reinforcement layer 23 is embedded in the ground wire extruded layer 24, so that the braided reinforcement layer is respectively integrated with the main line conductor shielding layer 14 and the ground wire extruded layer 24, thereby improving the overall tensile strength of the main line conductor shielding layer 14 and the ground wire extruded layer 24.

[0036] The cable core braided reinforcement layer 4 and the sheath layer 5 are sequentially arranged outside the cable core tape layer 3. Specifically, the cable core braided reinforcement layer 4 and the sheath layer 5 are reasonably arranged outside the cable core. Through this structural arrangement, the cable core has multiple layers of reliable protection to improve the cable's resistance to extrusion, impact and wear. Optionally, the cable core braided reinforcement layer 4 is an aramid wire mesh structure, which can effectively disperse the tensile stress borne by the cable sheath, and under the pressure of the rubber extruder when the sheath is extruded, the mesh structure of the cable core braided reinforcement layer 4 can be completely embedded in the sheath layer 5, so that the cable core braided reinforcement layer 4 and the sheath layer 5 become one, which not only maintains the softness and elasticity of the rubber sheath, but also improves the overall tensile strength of the cable sheath layer; the sheath layer 5 is made of chlorinated polyethylene rubber material, and this technical measure has the characteristics of high tensile resistance, extrusion resistance, and drag resistance.

[0037] In this embodiment, the cable core braided reinforcement layer 4 is embedded in the sheath layer 5. Optionally, the main line braided reinforcement layer 13, the ground wire braided reinforcement layer 23 and the cable core braided reinforcement layer 4 all include a mesh structure 1301, and a plurality of radial embedded columns 1302 vertically arranged on the mesh structure 1301; the radial embedded columns 1302 are inverted cone shape; the thickness of the main line conductor shielding layer 14, the ground wire extruded layer 24 and the sheath layer 5 is adjusted according to the number of radial embedded columns 1302. The adjusted thickness amount H is:

[0038]

[0039] Among them, C is the adjustment parameter; P is the number of radial embedded columns increased based on the standard radial embedded columns; M is the number of radial embedded columns reduced based on the standard radial embedded columns; the standard radial embedded columns are the current data, or the preset number.

[0040] Specifically, a plurality of radial embedded columns 1302 are vertically arranged on the braided reinforcement layer, and the radial embedded columns 1302 are in an inverted cone shape. Through the arrangement of the inverted cone-shaped radial embedded columns, the connection strength between the braided reinforcement layer and the main line conductor shielding layer, the ground wire extruded layer and the sheath layer is enhanced, and the tensile strength is further improved; and the connection strength between the main line conductor shielding layer, the ground wire extruded layer and the sheath layer is enhanced, and is adjusted according to the number of radial embedded columns. On the basis of meeting the tensile strength, the increase in cable diameter is avoided, and the transportation and use of the cable will not be affected.

[0041] The main line conductor shielding layer 14 is provided with a main line insulation layer 15 and a main line insulation ring shielding layer 16 in sequence. Optionally, the main line braided reinforcement layer 13 is a semi-conductive fiber braided structure; the main line conductor shielding layer 14 is a semi-conductive rubber extruded structure; the main line insulation layer 15 is an EPDM insulation extruded structure; the main line insulation ring shielding layer 16 is a semi-conductive rubber extruded structure, and the conductor shielding layer 14 is a semi-conductive rubber extruded structure.

[0042] Optionally, multiple main line cores 1 and multiple ground wire cores 2 are twisted. Specifically, the cable core includes three main line cores 1 and three ground wire cores 2 twisted together. The main line conductor 11 is a soft tinned copper conductor, the main line braided reinforcement layer 13 is a semi-conductive fiber braided reinforcement layer, and the ground wire braided reinforcement layer 23 is a semi-conductive fiber braided reinforcement layer. The three ground wire cores 2 are in the twisted side gaps of the three main line cores 1. This technical measure together with the external gap wrapping tape forms a stable cable core structure.

[0043] Embodiment 2:

[0044] The present embodiment provides a medium-voltage trailing cable design method for designing a medium-voltage trailing cable as described in Example 1, including: arranging the main line braided reinforcement layer 13 between the main line tape layer 12 and the main line conductor shielding layer 14, and arranging the ground wire braided reinforcement layer 23 between the ground wire tape layer 22 and the ground wire extruded layer 24.

[0045] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A medium voltage trailing cable, characterized in that: The cable comprises a plurality of main line cores (1) and a plurality of ground line cores (2), and a cable core tape layer (3) arranged outside the plurality of main line cores (1) and the plurality of ground line cores (2); The main line core (1) comprises a main line conductor (11), and a main line tape layer (12), a main line braided reinforcement layer (13), and a main line conductor shielding layer (14) which are sequentially arranged outside the main line conductor (11); the ground line core (2) comprises a ground line conductor (21), and a ground line tape layer (22), a ground line braided reinforcement layer (23), and a ground line extruded layer (24) which are sequentially arranged outside the ground line conductor (21); The main line braided reinforcement layer (13) is embedded in the main line conductor shielding layer (14), and the ground line braided reinforcement layer (23) is embedded in the ground line extruded layer (24).

2. A medium voltage trailing cable according to claim 1, characterized in that: A cable core braided reinforcement layer (4) and a sheath layer (5) are sequentially arranged outside the cable core tape layer (3).

3. A medium voltage trailing cable according to claim 2, characterized in that: The cable core braided reinforcement layer (4) is embedded in the sheath layer (5).

4. A medium voltage trailing cable as claimed in claim 3, characterized in that: The main line braided reinforcement layer (13), the ground line braided reinforcement layer (23) and the cable core braided reinforcement layer (4) all comprise a mesh structure (1301) and a plurality of radial embedded columns (1302) vertically arranged on the mesh structure (1301); the radial embedded columns (1302) are in an inverted cone shape.

5. A medium voltage trailing cable according to claim 4, characterized in that: The thicknesses of the main line conductor shielding layer (14), the ground wire extruded layer (24) and the sheath layer (5) are adjusted according to the number of radially embedded columns (1302).

6. A medium voltage trailing cable as claimed in claim 2, characterized in that: The sheath layer (5) is made of chlorinated polyethylene rubber material.

7. A medium voltage trailing cable according to claim 1, characterized in that: A main line insulation layer (15) and a main line insulation ring shielding layer (16) are sequentially arranged outside the main line conductor shielding layer (14).

8. A medium voltage trailing cable according to claim 7, characterized in that: The main line braided reinforcement layer (13) is a semi-conductive fiber braided structure; the main line conductor shielding layer (14) is a semi-conductive rubber extruded structure; the main line insulation layer (15) is an EPDM insulation extruded structure; and the main line insulation ring shielding layer (16) is a semi-conductive rubber extruded structure.

9. A medium voltage trailing cable according to claim 1, characterized in that: A plurality of main line cores (1) and a plurality of ground line cores (2) are twisted together.

10. A method for designing a medium voltage trailing cable, characterized in that: A medium voltage trailing cable designed as described in any one of claims 1 to 9, comprising: arranging the main line braided reinforcement layer (13) between the main line tape layer (12) and the main line conductor shielding layer (14), and arranging the ground wire braided reinforcement layer (23) between the ground wire tape layer (22) and the ground wire extruded layer (24).

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