Medium voltage aluminium alloy cross-linked polyethylene insulated cable

Abstract

This invention relates to the field of power cable technology and proposes a medium-voltage aluminum alloy cross-linked polyethylene insulated cable, comprising several stranded aluminum alloy conductors, each covered with a cross-linked polyethylene insulation layer, and a filler layer between the aluminum alloy conductors. The filler layer consists of a central tensile strip and several filler strips. A wrapping layer is provided outside the filler layer, and it also includes a protective layer, a liquid cooling heat dissipation component, and a tensile positioning component. The protective layer is provided outside the wrapping layer, and an outer sheath is provided outside the protective layer. The liquid cooling heat dissipation component is located inside the filler layer, and several tensile positioning components are installed on the outside of the cable. Through the above technical solution, the problem that the existing technology is difficult to meet the needs of complex laying scenarios such as tunnels, shafts, and cable trenches, resulting in weak structural stress stability and short service life of the protective structure is solved.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, specifically to a medium-voltage aluminum alloy cross-linked polyethylene insulated cable. Background Technology

[0002] Aluminum alloy power cables are power cables with aluminum alloy as the conductor. Alloy power cables make up for the shortcomings of the previous pure aluminum cables. Their bending performance, creep resistance and corrosion resistance are greatly improved. They can ensure that the cable maintains good stability under long-term overload and overheating. They are mainly used in indoor, tunnel, cable trench, shaft and other places that can withstand mechanical external force and a certain amount of tension and pressure. They are suitable for power, petrochemical, construction and other systems.

[0003] Because most current cable filling structures use a dense filling method, their axial tensile and radial compressive strength is poor in practical engineering applications. Especially in vertical laying scenarios with high drops in shafts, the cable also needs to withstand the continuous axial tensile force from its own weight. The tensile performance of the existing dense filling structure is relatively limited, and long-term use can easily lead to problems such as filling layer deformation and conductor loosening, and even affect the integrity of the insulation layer. Its stability under axial tensile force is significantly weak. Furthermore, if the cable is laid densely, the compression between cables and the impact generated during construction will also lead to more severe local stress concentration in the outer sheath layer, making it difficult to adapt to the bending laying requirements of cables in tunnels and shafts. Moreover, stress accumulation is easily generated when the cable is bent, thus affecting the service life of the protective structure. Summary of the Invention

[0004] This invention proposes a medium-voltage aluminum alloy cross-linked polyethylene insulated cable to solve the problem that existing technologies cannot meet the needs of complex laying scenarios such as tunnels, shafts, and cable trenches, resulting in weak structural stress stability and short service life of the protective structure.

[0005] The technical solution of the present invention is as follows: A medium-voltage aluminum alloy cross-linked polyethylene insulated cable includes several stranded aluminum alloy conductors, each of which is covered with a cross-linked polyethylene insulation layer, a filler layer between the several aluminum alloy conductors, and a wrapping tape layer outside the filler layer, and further includes: A protective layer is provided outside the wrapping layer to resist external impacts and pressures during cable laying; an outer sheath layer is provided outside the protective layer. A liquid cooling heat dissipation component is disposed inside the filling layer to transfer the heat generated during the operation of the power cable. Tensile positioning components are provided, with several of them installed on the outside of the cable to fix the position of the cable and resist the tensile and compressive forces acting on the cable along its length.

[0006] To improve the axial tensile strength of the cable, the filling layer consists of a central tensile strip and several filling strips. Each pair of aluminum alloy conductors is provided with a filling strip, and each filling strip has a conveying pipe inside. Each filling strip also has a pressure-resistant groove symmetrically arranged around the conveying pipe.

[0007] In order to improve the cable's tensile strength and radial compressive strength, the protective layer consists of an inner sheath layer, a protective interlayer, and an armor layer. The inner sheath layer, the protective interlayer, and the armor layer are sequentially wrapped around the outer sheath layer. The protective interlayer can resist impact or compression when the outer sheath layer is subjected to impact or compression.

[0008] The protective interlayer includes an inner interlayer and an outer interlayer. The outer side of the inner interlayer has several protruding ridges arranged at equal angles in a circumferential shape. The protruding ridges are spirally arranged along the axial direction of the cable. The outer interlayer is located outside the inner interlayer.

[0009] To facilitate heat dissipation from the cable, the liquid cooling heat dissipation assembly includes: Water distribution rings are coaxially arranged at both ends of the cable. The water distribution rings have a hollow internal structure, and water distribution pipes are connected to both water distribution rings. A water pipe, the input end of which is connected to one of the water distribution pipes, and the input end of the other water distribution pipe and the output end of the water pipe are respectively used for the input and output of coolant; The two water distribution rings are both circumferentially and equidistantly connected to a number of connectors, and each connector corresponds to and is connected to a corresponding delivery pipe. The binding sleeve is provided on the side of each of the two water distribution rings near the cable. The binding sleeve is located outside the several aluminum alloy conductors and several delivery pipes, and the binding sleeve is in contact with the cross-linked polyethylene insulation layer.

[0010] Furthermore, it also includes heat-shrinkable finger sleeves. Both of the two water distribution rings are covered with heat-shrinkable finger sleeves. The heat-shrinkable finger sleeves are provided with a plurality of conductor finger sleeves and water distribution finger sleeves. The two heat-shrinkable finger sleeves are located at both ends of the cable and are in contact with the outer sheath layer at the corresponding positions. Among them, several wire finger sleeves are respectively wrapped around several aluminum alloy conductors, the wire finger sleeves are in contact with the cross-linked polyethylene insulation layer, and the water distribution finger sleeves are wrapped around the outside of the water distribution pipe.

[0011] To secure the cable at the laying location, the tensile positioning assembly includes: A positioning frame, wherein a plurality of positioning frames are provided along the length direction of the cable; The positioning ring is installed inside each of the positioning frames and is disposed on the outer sheath layer. The positioning ring is composed of two arc-shaped positioning rings. Two sets of arc-shaped support bars are symmetrically installed inside each arc-shaped positioning ring and the arc-shaped support bars abut against the outer sheath layer.

[0012] Furthermore, the two sets of arc-shaped support bars within each arc-shaped positioning ring are arranged symmetrically, and each set of arc-shaped support bars has several bars at equal intervals, and the cross-section of each arc-shaped support bar is set to be inclined.

[0013] Furthermore, it also includes mounting brackets, with each positioning bracket having a mounting bracket fixedly mounted on its top, and a pull rope installed between every two adjacent mounting brackets, the pull rope being spirally wound around the outer sheath layer.

[0014] The working principle and beneficial effects of this invention are as follows: 1. In this invention, the axial tensile strength of the cable is improved by the central tensile strip, and the anti-compression groove set in the filler strip enhances the radial compressive strength. Combined with the tensile positioning component on the outside of the cable, the tensile and compressive strength of the cable is improved. Especially in the scenario of vertical laying in a shaft, it can effectively resist the continuous axial tensile force brought by the cable's own weight and reduce the structural deformation of the cable caused by excessive force.

[0015] 2. In this invention, the inclined arc-shaped support bar increases the contact area and friction with the outer sheath layer. With the help of the spiral pull rope, the positioning stability of the cable is further improved, avoiding slippage and twisting problems during the laying process, while not affecting the heat dissipation of the cable.

[0016] 3. In this invention, by setting up a protective interlayer, the spiral protrusions on the outside of the inner interlayer can evenly disperse external impact and extrusion forces, avoiding local stress concentration, thereby adapting to the bending laying requirements of tunnels, shafts and other scenarios, reducing stress accumulation when the cable is bent, and extending the service life of the protective structure. With the cooperation of the inner sheath, armor layer and outer sheath, the impact and extrusion resistance of the cable is further improved, effectively reducing the impact of external mechanical damage on the internal structure of the cable.

[0017] 4. In this invention, the delivery pipe is integrated inside the filler strip. Through the connection between the water distribution ring, the connector and the delivery pipe, the coolant is circulated and dissipated. Compared with the existing passive heat dissipation method, the heat dissipation efficiency is significantly improved. It can quickly remove the heat generated during the operation of the cable and avoid local heat accumulation affecting the stability of the cable operation. At the same time, the setting of the binding sleeve and heat shrink finger sleeve not only fixes the cable end structure, but also enhances the sealing performance of the cable end, further ensuring the insulation performance and operational reliability of the cable. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure from another angle in this invention; Figure 3 This is a cross-sectional view of the liquid cooling heat dissipation component in this invention; Figure 4 This is a cross-sectional structural diagram showing the combination of the aluminum alloy conductor, cross-linked polyethylene insulation layer, filling layer, wrapping layer, outer sheath layer, conveying pipe, pressure-resistant groove, inner sheath layer, protective interlayer, and armor layer in this invention. Figure 5 This is a cross-sectional view of the inner sandwich layer, outer sandwich layer, and protruding ridge in this invention. Figure 6 This is a cross-sectional view of the tensile positioning component and the outer sheath in this invention. Figure 7 This is a schematic diagram of the structure of the arc-shaped positioning ring and the arc-shaped support strip in this invention; Figure 8 This is a cross-sectional view of the arc-shaped positioning ring and the arc-shaped support strip in this invention.

[0020] In the diagram: 1. Aluminum alloy conductor; 2. Cross-linked polyethylene insulation layer; 3. Filler layer; 301. Central tensile strip; 302. Filler strip; 4. Wrapping tape layer; 5. Outer sheath layer; 6. Delivery pipe; 7. Pressure-resistant groove; 8. Inner sheath layer; 9. Protective interlayer; 901. Inner interlayer; 902. Outer interlayer; 903. Raised ridge; 10. Armor layer; 11. Water distribution ring; 12. Water distribution pipe; 13. Water passage pipe; 14. Connector; 15. Binding sleeve; 16. Heat-shrink finger sleeve; 1601. Wire finger sleeve; 1602. Water distribution finger sleeve; 17. Positioning frame; 18. Arc-shaped positioning ring; 19. Arc-shaped support strip; 20. Mounting frame; 21. Pull rope. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1 to 3 As shown, this embodiment proposes a medium-voltage aluminum alloy cross-linked polyethylene insulated cable, comprising several stranded aluminum alloy conductors 1, each of which is covered with a cross-linked polyethylene insulation layer 2. The cross-linked polyethylene insulation layer 2 is made of cross-linked polyethylene (XLPE) material with an insulation strength ≥10kV / mm. This material possesses excellent insulation performance, aging resistance, and mechanical strength, effectively isolating the aluminum alloy conductors 1 from the external structure to prevent leakage. It is also suitable for long-term overload and overheating operation, ensuring stable electrical performance of the cable. Figure 4 As shown, a filling layer 3 is provided between several aluminum alloy conductors 1. The filling layer 3 is composed of a central tensile strip 301 and several filling strips 302. A filling strip 302 is provided between every two aluminum alloy conductors 1. A conveying pipe 6 is provided inside each filling strip 302. A pressure-resistant groove 7 is symmetrically arranged inside each filling strip 302 with the conveying pipe 6 as the center. A wrapping layer 4 is provided outside the filling layer 3. It also includes a protective layer, a liquid cooling heat dissipation component and a tensile positioning component. A protective layer is provided outside the wrapping layer 4 to resist external impact and pressure when laying the cable. An outer sheath layer 5 is provided outside the protective layer. The protective layer is composed of an inner sheath layer 8, a protective interlayer 9 and an armor layer 10. The inner sheath layer 8, the protective interlayer 9 and the armor layer 10 are sequentially wrapped outside the wrapping layer 4. The protective interlayer 9 can resist impact or compression when the outer sheath layer 5 is impacted or squeezed.

[0023] Among them, such as Figure 4 , Figure 5 As shown, the protective interlayer 9 includes an inner interlayer 901 and an outer interlayer 902. The outer side of the inner interlayer 901 is provided with several protruding ribs 903 at equal angles in a circumferential shape. The protruding ribs 903 are spirally arranged along the axial direction of the cable. The outer interlayer 902 is provided outside the inner interlayer 901.

[0024] Specifically, during installation or use, the inner layer 901 and the outer layer 902 work together. The inner layer 901, with its spirally arranged protruding ribs 903, can evenly distribute the radial impact and compressive force from the outside in the circumferential direction, avoiding local stress concentration that could damage the inner sheath layer 8 and the wrapping layer 4. At the same time, the structure of the spiral protruding ribs 903 is adapted to the bending installation of the cable in tunnels, cable trenches, and shafts. When the cable bends, the spiral protruding ribs 903 can deform synchronously with the cable, avoiding stress accumulation and thus protecting the protective layer 9. The outer layer 902 tightly wraps around the inner layer 901, further enhancing the overall structural strength of the protective layer 9 and improving the cable's impact and compression resistance. Together with the armor layer 10, it can effectively resist mechanical damage during installation and long-term operation.

[0025] The liquid cooling heat dissipation component is located inside the filling layer 3 to transfer the heat generated during the operation of the power cable, such as... Figure 3 As shown, the liquid cooling heat dissipation assembly includes a water distribution ring 11, a water pipe 13, a connector 14, and a binding sleeve 15. Both ends of the cable are coaxially equipped with water distribution rings 11. The water distribution rings 11 have a hollow internal structure. Water distribution pipes 12 are connected to both water distribution rings 11. The input end of the water pipe 13 is connected to one of the water distribution pipes 12, and the input end of the other water distribution pipe 12 and the output end of the water pipe 13 are used for coolant input and output, respectively. Several connectors 14 are fixedly connected in a circular shape at equal angles inside each of the two water distribution rings 11. Each connector 14 corresponds to and is connected to a corresponding delivery pipe 6. A binding sleeve is provided on the side of each water distribution ring 11 near the cable. 15. The binding sleeve 15 is located outside several aluminum alloy conductors 1 and several conveying pipes 6. The binding sleeve 15 is in contact with the cross-linked polyethylene insulation layer 2. It also includes heat-shrinkable finger sleeves 16. Heat-shrinkable finger sleeves 16 are fitted on the outside of the two water distribution rings 11. Several conductor finger sleeves 1601 and water distribution finger sleeves 1602 are provided on the heat-shrinkable finger sleeves 16. The two heat-shrinkable finger sleeves 16 are located at both ends of the cable and are in contact with the outer sheath layer 5 at the corresponding positions. Among them, several conductor finger sleeves 1601 are respectively wrapped on several aluminum alloy conductors 1 and are in contact with the cross-linked polyethylene insulation layer 2. The water distribution finger sleeves 1602 are wrapped on the outside of the water distribution pipe 12.

[0026] Specifically, during the laying process, the water distribution ring 11 is installed at the cable end and connected to the corresponding delivery pipe 6 through the connector 14. Then, a binding sleeve 15 is installed for protection, and finally, the cable end is wrapped and protected by the heat-shrink finger sleeve 16. At this time, several aluminum alloy conductors 1 are located inside the conductor finger sleeve 1601, and the water distribution pipe 12 is located inside the water distribution finger sleeve 1602. The input end of the cooling equipment is connected to the output end of the water pipe 13, and the output end of the cooling equipment is connected to the corresponding water distribution pipe 12. Figure 1 , Figure 2 , Figure 3 As shown, arrow A indicates the coolant input direction, and arrow B indicates the coolant output direction.

[0027] When the cable is laid and heat is dissipated, the coolant is introduced through the inlet of the water pipe 13 by the cooling equipment. The coolant enters the water distribution ring 11 through the corresponding water distribution pipe 12. The water distribution ring 11 distributes the coolant evenly to each joint 14 and injects it into the corresponding delivery pipe 6 through the joint 14. Since the delivery pipe 6 is close to the aluminum alloy conductor 1, it can quickly absorb the heat generated by the aluminum alloy conductor 1 during operation. The coolant carrying the heat flows along the delivery pipe 6 to the water distribution ring 11 at the other end of the cable. After being collected by the water distribution ring 11, it is discharged through the corresponding water distribution pipe 12 to the outlet of the water pipe 13, completing the heat dissipation cycle.

[0028] The binding sleeve 15 is used to fix the aluminum alloy conductor 1 and the delivery pipe 6 at the end of the cable to prevent them from shifting or loosening, ensure the sealing of the connection between the connector 14 and the delivery pipe 6, and also prevent coolant leakage.

[0029] It should be noted that after being heated and shrunk, the heat-shrinkable finger sleeve 16 can tightly wrap around the water distribution ring 11, the aluminum alloy conductor 1, and the water distribution pipe 12. The conductor finger sleeve 1601 wraps around the end of the aluminum alloy conductor 1, further enhancing the insulation performance. The water distribution finger sleeve 1602 wraps around the water distribution pipe 12, improving the sealing at the connection between the water distribution pipe 12 and the water distribution ring 11. At the same time, the heat-shrinkable finger sleeve 16 fits tightly with the outer sheath layer 5, preventing moisture and dust from entering the cable and ensuring the long-term stable operation of the cable.

[0030] Several tensile positioning components are installed on the outside of the cable to fix its position and resist tensile and compressive forces along its length, such as... Figures 6 to 8 As shown, the tensile positioning assembly includes a positioning frame 17 and positioning rings. Several positioning frames 17 are arranged along the length of the cable. Each positioning frame 17 has a positioning ring installed inside. Each positioning ring is set on the outer sheath layer 5. The positioning ring is composed of two arc-shaped positioning rings 18. Two sets of arc-shaped support bars 19 are symmetrically installed inside each arc-shaped positioning ring 18. The arc-shaped support bars 19 abut against the outer sheath layer 5. The two sets of arc-shaped support bars 19 in each arc-shaped positioning ring 18 are symmetrically arranged. Several arc-shaped support bars 19 are arranged at equal intervals in each set. The cross-section of each arc-shaped support bar 19 is set to be inclined.

[0031] Specifically, when it is necessary to fix the cable laying position, first connect the two arc-shaped positioning rings 18 onto the outer sheath layer 5, so that the arc-shaped support strip 19 is in close contact with the outer sheath layer 5. The arc-shaped support strip 19 with inclined cross section can increase the contact area and friction with the outer sheath layer 5, enhance the clamping stability, and at the same time disperse the clamping pressure of the positioning ring on the cable, so as to avoid damaging the outer sheath layer 5.

[0032] After docking, the positioning ring is fixed inside the positioning frame 17. The positioning frame 17 is fixed to the laying support of the cable trench, tunnel, and shaft by expansion bolts and other connectors to achieve fixed positioning of the cable. Under the action of two sets of arc-shaped support bars 19 with opposite inclination directions, and in conjunction with the positioning frames 17 spaced apart along the cable length, the axial slippage of the cable can be effectively restricted. It is especially suitable for vertical laying scenarios in shafts to resist the axial tension generated by the cable's own weight.

[0033] Furthermore, it also includes mounting brackets 20, with each positioning bracket 17 having a mounting bracket 20 fixedly mounted on its top. A pull rope 21 is installed between every two adjacent mounting brackets 20, and the pull rope 21 is spirally wound around the outer sheath layer 5.

[0034] Specifically, after the cable is laid, in order to improve the cable's tensile strength, the two ends of the pull rope 21 can be fixed to two adjacent mounting brackets 20 respectively. The pull rope 21 is spirally and tightly wound around the surface of the outer sheath layer 5 to form additional tensile constraints. It works in conjunction with the central tensile strip 301 of the filling layer 3 to further improve the overall axial tensile strength of the cable and prevent the cable from breaking due to excessive tension during long-term operation or laying. At the same time, the spirally wound pull rope 21 can also help fix the cable, enhance the cable's anti-torsion ability, reduce the cable's torsional movement when laying in tunnels or shafts, but does not hinder the airflow on the cable surface and does not affect the cable's heat dissipation.

[0035] The medium-voltage aluminum alloy cross-linked polyethylene insulated cable is used as follows: When it is necessary to fix the cable laying position during the cable laying process, first, connect the two arc-shaped positioning rings 18 to the outer sheath layer 5, so that the arc-shaped support strip 19 is in close contact with the outer sheath layer 5. Then, fix the connected positioning rings inside the positioning frame 17. The positioning frame 17 is fixed to the laying support of the cable trench, tunnel, or shaft by expansion bolts and other connectors to achieve the fixed positioning of the cable. Under the action of the two sets of arc-shaped support strips 19 with opposite inclination directions, the axial slippage of the cable can be effectively restricted. It is especially suitable for vertical laying scenarios in shafts to resist the axial tension generated by the cable's own weight.

[0036] During the laying process, the water distribution ring 11 is installed at the end of the cable and connected to the corresponding delivery pipe 6 through the connector 14. Then, the binding sleeve 15 is set for protection. Finally, the end of the cable is wrapped and protected by the heat shrink finger sleeve 16. At this time, several aluminum alloy conductors 1 are located inside the conductor finger sleeve 1601, and the water distribution pipe 12 is located inside the water distribution finger sleeve 1602. The input end of the cooling equipment is connected to the output end of the water pipe 13, and the output end of the cooling equipment is connected to the corresponding water distribution pipe 12.

[0037] After the cable laying is completed, the two ends of the pull rope 21 are fixed to two adjacent mounting brackets 20 respectively. The pull rope 21 is spirally and tightly wound around the surface of the outer sheath layer 5 to form additional tensile constraints. It works in conjunction with the central tensile strip 301 of the filling layer 3 to further enhance the overall axial tensile strength of the cable and prevent the cable from breaking due to excessive tension during long-term operation or laying. At the same time, the spirally wound pull rope 21 can also help fix the cable, enhance the cable's anti-torsion ability, reduce the torsional movement of the cable when laying in tunnels or shafts, but does not hinder the air circulation on the cable surface and does not affect the cable's heat dissipation.

[0038] The inner layer 901 and the outer layer 902 work together. The inner layer 901, with its spirally arranged protruding ribs 903, can evenly distribute the radial impact and extrusion forces from the outside in the circumferential direction, avoiding local stress concentration that could damage the inner sheath layer 8 and the wrapping layer 4. At the same time, the structure of the spiral protruding ribs 903 is adapted to the bending of the cable in tunnels, cable trenches, and shafts. When the cable bends, the spiral protruding ribs 903 can deform synchronously with the cable, avoiding stress accumulation and thus protecting the protective layer 9. The outer layer 902 tightly wraps around the inner layer 901, further enhancing the overall structural strength of the protective layer 9 and improving the cable's impact and extrusion resistance. Together with the armor layer 10, it can effectively resist mechanical damage during laying and long-term operation.

[0039] When heat dissipation of the cable is required, coolant is introduced through the inlet of water pipe 13 via a cooling device. The coolant then enters the water distribution ring 11 through the corresponding water distribution pipe 12. The water distribution ring 11 distributes the coolant evenly to each connector 14, and then injects it into the corresponding delivery pipe 6 through the connector 14. Since the delivery pipe 6 is close to the aluminum alloy conductor 1, it can quickly absorb the heat generated by the aluminum alloy conductor 1 during operation. The coolant carrying the heat flows along the delivery pipe 6 to the water distribution ring 11 at the other end of the cable. After being collected by the water distribution ring 11, it is discharged through the corresponding water distribution pipe 12 to the outlet of water pipe 13, completing the heat dissipation cycle.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A medium-voltage aluminum alloy cross-linked polyethylene insulated cable, comprising a plurality of stranded aluminum alloy conductors (1), each of the aluminum alloy conductors (1) being covered with a cross-linked polyethylene insulation layer (2), a filler layer (3) being disposed between the plurality of aluminum alloy conductors (1), and a wrapping layer (4) being disposed outside the filler layer (3), characterized in that, Also includes: The filling layer (3) is composed of a central tensile strip (301) and several filling strips (302). The filling strip (302) is provided between every two aluminum alloy conductors (1). Each filling strip (302) is provided with a conveying pipe (6) inside. Each filling strip (302) is provided with a pressure-resistant groove (7) symmetrically arranged with the conveying pipe (6) as the center. The protective layer is provided outside the wrapping layer (4). The protective layer consists of an inner sheath layer (8), a protective interlayer (9), and an armor layer (10). It is used to resist external impact and pressure when laying cables. The outer sheath layer (5) is provided outside the protective layer. The protective interlayer (9) includes an inner interlayer (901) and an outer interlayer (902). The outer side of the inner interlayer (901) is provided with a number of protruding ribs (903) in a circular shape at equal angles. The protruding ribs (903) are spirally arranged along the axial direction of the cable. The outer interlayer (902) is provided outside the inner interlayer (901). Liquid cooling heat dissipation component, which is disposed inside the filling layer (3) to transfer the heat generated during the operation of the power cable; Tensile positioning components are provided, with several of them installed on the outside of the cable to fix the position of the cable and resist the tensile and compressive forces acting on the cable along its length.

2. The medium-voltage aluminum alloy cross-linked polyethylene insulated cable according to claim 1, characterized in that, The outer sheath layer (4) is sequentially covered with the inner sheath layer (8), the protective interlayer (9) and the armor layer (10). The protective interlayer (9) can resist impact or compression when the outer sheath layer (5) is impacted or squeezed.

3. A medium-voltage aluminum alloy cross-linked polyethylene insulated cable according to claim 2, characterized in that, The liquid cooling heat dissipation component includes: Water distribution ring (11), both ends of the cable are coaxially provided with the water distribution ring (11), the inside of the water distribution ring (11) is set as a hollow structure, and the two water distribution rings (11) are connected to the water distribution pipe (12). Water pipe (13), the input end of the water pipe (13) is connected to one of the water distribution pipes (12), and the input end of the other water distribution pipe (12) and the output end of the water pipe (13) are respectively used for the input and output of coolant; The connector (14) has several connectors (14) fixedly connected in a circular shape at equal angles inside the two water distribution rings (11). The several connectors (14) correspond one-to-one with the corresponding delivery pipes (6) and are connected. The binding sleeve (15) is provided on the side of each of the two water distribution rings (11) near the cable. The binding sleeve (15) is located outside of several aluminum alloy conductors (1) and several delivery pipes (6). The binding sleeve (15) is in contact with the cross-linked polyethylene insulation layer (2).

4. A medium-voltage aluminum alloy cross-linked polyethylene insulated cable according to claim 3, characterized in that, It also includes heat shrink finger sleeves (16), and the heat shrink finger sleeves (16) are fitted on the outside of the two water distribution rings (11). The heat shrink finger sleeves (16) are provided with a number of conductor finger sleeves (1601) and water distribution finger sleeves (1602). The two heat shrink finger sleeves (16) are located at both ends of the cable and are in contact with the outer sheath layer (5) at the corresponding positions. Among them, several wire finger sleeves (1601) are respectively covered and disposed on several aluminum alloy conductors (1), the wire finger sleeves (1601) are in contact with the cross-linked polyethylene insulation layer (2), and the water distribution finger sleeves (1602) are covered and disposed on the outside of the water distribution pipe (12).

5. A medium-voltage aluminum alloy cross-linked polyethylene insulated cable according to claim 1, characterized in that, The tensile positioning component includes: Positioning frame (17), wherein a plurality of positioning frames (17) are provided along the length direction of the cable. The positioning ring is installed inside each of the positioning frames (17). Each positioning ring is set on the outer sheath layer (5). The positioning ring is composed of two arc-shaped positioning rings (18). Each arc-shaped positioning ring (18) has two sets of arc-shaped support bars (19) symmetrically installed inside. The arc-shaped support bars (19) abut against the outer sheath layer (5).

6. A medium-voltage aluminum alloy cross-linked polyethylene insulated cable according to claim 5, characterized in that, Two sets of arc-shaped support bars (19) are symmetrically arranged in each arc-shaped positioning ring (18). Each set of arc-shaped support bars (19) is provided with several bars at equal intervals. The cross-section of each arc-shaped support bar (19) is set to be inclined.

7. A medium-voltage aluminum alloy cross-linked polyethylene insulated cable according to claim 6, characterized in that, It also includes mounting brackets (20), each of the positioning brackets (17) is fixedly mounted with the mounting bracket (20) on top, and a pull rope (21) is installed between every two adjacent mounting brackets (20), the pull rope (21) being spirally wound around the outer sheath layer (5).

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