A profiled conductor cross-linked polyethylene insulated medium voltage power cable

Abstract

The application relates to the technical field of power cables, and discloses a type line conductor cross-linked polyethylene insulated medium-voltage power cable, which comprises a cable main body, the cable main body comprises a plurality of twistedly arranged conductors, each conductor is externally coated with a cross-linked polyethylene insulation layer, a fire-resistant mica layer is arranged between the outer part of each conductor and the cross-linked polyethylene insulation layer, and the cable main body further comprises a wrapping layer, a sheath structure, an air guide hose and an air guide assembly; the outer part of the plurality of conductors is provided with the wrapping layer, a filling layer is arranged between the inner part of the wrapping layer and the plurality of conductors, the sheath structure is arranged on the outer part of the wrapping layer, the inner part of the filling layer is provided with the plurality of air guide hoses, the air guide assembly is provided with two air guide assemblies, and the plurality of air guide hoses are located between the two air guide assemblies. Through the technical scheme, the problem that, in the prior art, due to dense arrangement of cables in a cable trench, heat dissipation of the cables is limited, thereby causing cable current-carrying capacity to decrease and affecting insulation life is solved.

Description

Technical Field

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

[0002] Shaped cables are a type of medium-voltage cable (referring to power cables with rated voltage between 6 kV and 35 kV). They are commonly used in many fields such as urban power distribution, rural power grids, mining power systems, and rail transit systems. Unlike common round monofilament conductors, which have round copper wires inside, shaped cables generally use round conductors to make the cable more compact.

[0003] The shaped wires in shaped cables are conductors with different geometric shapes made to meet different needs. In the production process, multiple copper or aluminum single wires are generally drawn into different combined shapes such as trapezoids or rectangles, and then twisted into conductors. In this way, the conductor twisting structure is more compact, so the gap between the single wires is extremely small, which makes the cable structure more compact. Compared with cables with round conductors, shaped cables have a smaller conductor outer diameter for the same cross-sectional area, which saves more pipe space.

[0004] When laying cables in areas such as residential communities and industrial parks, for example, when power needs to be transmitted from the power supply end to the power consumption end, cable trenches are used. During cable laying, both ends of the cable are brought up from the starting and ending points of the cable trench to form terminations, which are then connected to the electrical equipment at both ends. When laying cables in the cable trench, the cables are generally laid on the cable trays of the cable trench. In general, multiple cables are laid together in the cable trench. Because the cables in the cable trench are very dense, they are usually arranged in layers on the supports. During operation, a large number of cables generate heat simultaneously, resulting in high power. In addition, the ventilation in the enclosed tunnel is poor, and the temperature difference for heat dissipation is small. At the same time, due to the relatively limited space, the natural airflow is also affected, which leads to the accumulation of heat. This not only reduces the current carrying capacity but also affects the insulation life. External heat dissipation measures are often inefficient and difficult to effectively dissipate heat from the heat-generating areas of the internal conductors of the cable. Summary of the Invention

[0005] This invention proposes a cross-linked polyethylene insulated medium-voltage power cable with a shaped conductor, which solves the problem in the prior art where the dense arrangement of cables in the cable trench leads to limited heat dissipation, resulting in reduced current carrying capacity and affecting insulation life.

[0006] The technical solution of the present invention is as follows:

[0007] A cross-linked polyethylene insulated medium-voltage power cable with a cross-linked polyethylene conductor includes a cable body comprising multiple stranded conductors, each conductor being covered with a cross-linked polyethylene insulation layer, and a fire-resistant mica layer being disposed between the outside of each conductor and the cross-linked polyethylene insulation layer. The cable also includes:

[0008] The wrapping layer is provided on the outside of the multiple conductors, and a filling layer is provided between the wrapping layer and the multiple conductors;

[0009] A sheath structure, wherein the sheath structure is disposed outside the wrapping layer, for protecting the power cable;

[0010] The filling layer contains multiple air-conducting hoses, each corresponding to a different conductor and arranged in a staggered manner.

[0011] An air guiding assembly is provided in two, with multiple air guiding hoses located between the two air guiding assemblies for allowing air to flow within the multiple air guiding hoses;

[0012] A heat dissipation component is disposed on the sheath structure and is used to dissipate heat from the sheath structure.

[0013] An air supply assembly for supplying air to the air guide assembly and the heat dissipation assembly.

[0014] Based on the aforementioned solution, the sheath structure includes:

[0015] An inner lining layer is provided covering the outside of the wrapping layer, and an armor layer is provided covering the outside of the inner lining layer;

[0016] The outer sheath layer is provided to cover the outside of the armor layer.

[0017] Based on the aforementioned solution, the air guiding assembly includes:

[0018] Air guide cylinders are provided at both ends of the cable body, and the two air guide cylinders are connected at equal angles in a circular shape on the side near the power cable.

[0019] Among them, several air guide hoses correspond one-to-one with several air guide connectors, one end of several air guide hoses is connected to several air guide connectors on one of the air guide cylinders, and the other end of several air guide hoses is connected to several air guide connectors on another air guide cylinder.

[0020] The two air cylinders are connected to the connecting pipe on the side away from the cable body;

[0021] The connector is installed at both ends of the cable body for connecting electrical equipment.

[0022] Based on the aforementioned solution, the connector includes:

[0023] Heat shrinkable finger sleeves are provided on the outside of both air ducts. Each heat shrinkable finger sleeve includes a main body, a first finger sleeve, and a second finger sleeve. The two heat shrinkable finger sleeves are located at both ends of the cable body, and the main body of the two heat shrinkable finger sleeves covers both ends of the outer sheath layer.

[0024] Each heat-shrinkable finger sleeve is provided with a plurality of first finger sleeves, and the plurality of first finger sleeves correspond one-to-one with a plurality of conductors. The first finger sleeves are covered and disposed on the cross-linked polyethylene insulation layer.

[0025] Each of the heat-shrinkable finger sleeves is provided with a second finger sleeve, and the second finger sleeve covers the connecting tube;

[0026] Terminal blocks, wherein both ends of several conductors are fixedly installed with terminal blocks;

[0027] Each of the terminals is covered with a heat-shrinkable sheath between itself and the corresponding cross-linked polyethylene insulation layer.

[0028] In addition to the aforementioned solutions, the following are also included:

[0029] The binding layer is provided on the side of each of the two air ducts near the cable body. The binding layer is located outside the several conductors and is in contact with the cross-linked polyethylene insulation layer.

[0030] Support sleeves are installed on the outside of both strap layers, and the outer side of the support sleeves contacts the inside of the main body of the heat-shrink finger sleeve.

[0031] Based on the aforementioned solution, the heat dissipation component includes:

[0032] The heat dissipation ring frame is provided with a plurality of heat dissipation ring frames at equal intervals on the outside of the outer sheath layer, and the heat dissipation ring frame is composed of an upper positioning ring and a lower positioning ring;

[0033] Each of the upper positioning rings and each of the lower positioning rings is configured with a hollow structure inside;

[0034] The mating protrusions and mating grooves are provided at both ends of the bottom of each upper positioning ring, and the mating grooves are provided at the corresponding positions of the two mating protrusions at the bottom of each upper positioning ring and the lower positioning ring.

[0035] The hollow structure of the upper positioning ring is connected to the hollow structure of the lower positioning ring;

[0036] Each of the upper positioning rings and each of the lower positioning rings is provided with an exhaust section for discharging air.

[0037] An air inlet is provided between several of the lower positioning rings to deliver air into the heat dissipation ring frame.

[0038] Based on the aforementioned scheme, the exhaust section includes ventilation slots, and each upper positioning ring has several ventilation slots formed at equal angles on both sides in an arc shape, and each lower positioning ring has several ventilation slots formed at equal angles on both sides in an arc shape.

[0039] Based on the aforementioned solution, the air inlet includes:

[0040] Each of the lower positioning rings is connected to a three-way connector;

[0041] An air supply pipe is connected between every two adjacent T-joints.

[0042] Based on the aforementioned solution, the gas supply assembly includes:

[0043] A blower, the output end of which is connected to an air supply duct, and a plurality of conveying joints are connected to the side of the air supply duct away from the blower;

[0044] The blower is located at the end near the main body of the cable;

[0045] A conveying pipe is connected to the tee joint near the blower, and the conveying pipe is connected to one of the conveying joints;

[0046] Of the two connecting pipes, the connecting pipe closer to the blower is connected to one of the conveying joints, and the other connecting pipe is connected to the tee joint farther from the blower.

[0047] The working principle and beneficial effects of this invention are as follows:

[0048] 1. In this invention, since multiple air-conducting hoses are provided in the filling layer inside the cable, and the multiple air-conducting hoses correspond one-to-one with multiple conductors and are staggered, when air is forcibly sent into the air-conducting hoses, the heat transferred from the conductors to the air-conducting hoses can be carried away by the air flow, thereby quickly reducing the working dimension of the conductors and facilitating the improvement of the cable's safe current carrying capacity.

[0049] 2. In this invention, the air entering the delivery pipe enters the T-joint closest to the blower and enters between the corresponding lower positioning ring and upper positioning ring. Then, through the air supply pipe connecting multiple T-joints, the air is sequentially delivered to the lower positioning ring and upper positioning ring of the next level, and then discharged through the ventilation slots on both sides of multiple upper and lower positioning rings, thereby forming an airflow on the cable surface, facilitating air circulation in the external environment of the cable, and thus facilitating heat dissipation of the cable.

[0050] 3. In this invention, by setting up an air supply component, air is simultaneously supplied to the air guiding component and heat dissipation component in the cable. Through the cooperation of the air guiding component and the air-wrapped hose, heat is dissipated inside the cable. At the same time, through the setting up of the heat dissipation component, heat is dissipated outside the cable, thereby reducing the occurrence of reduced current carrying capacity of the cable due to poor heat dissipation and improving the service life of the cable. Attached Figure Description

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0052] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0053] Figure 2 This is a schematic diagram of the structure of the cable body and sheath in this invention.

[0054] Figure 3 This is a schematic diagram of the overall structure from another angle in this invention;

[0055] Figure 4 This is a cross-sectional three-dimensional structural schematic diagram of the present invention;

[0056] Figure 5 This is a cross-sectional view of the air guiding assembly in this invention.

[0057] Figure 6 This is a schematic diagram of the structure of the heat-shrink finger sleeve in this invention;

[0058] Figure 7 This is a cross-sectional view of the air guiding component and the heat dissipation component in this invention.

[0059] Figure 8 This is a schematic diagram of the heat dissipation component in this invention;

[0060] Figure 9 This is a schematic diagram of the heat dissipation component from another angle in this invention;

[0061] Figure 10 This is a schematic diagram of the gas supply component in this invention.

[0062] In the diagram: 1. Conductor; 2. Cross-linked polyethylene insulation layer; 3. Fire-resistant mica layer; 4. Wrapping layer; 5. Filler layer; 6. Air duct; 7. Inner lining layer; 8. Armor layer; 9. Outer sheath layer; 10. Air duct; 11. Air duct connector; 12. Connecting pipe; 13. Heat-shrinkable finger sleeve; 1301. Main body; 1302. First finger sleeve; 1303. Second finger sleeve; 14. Terminal block; 15. Heat-shrinkable sheath; 16. Binding strap layer; 17. Support sleeve; 18. Upper positioning ring; 19. Lower positioning ring; 20. Butt joint protrusion; 21. Butt joint groove; 22. Ventilation slot; 23. T-connector; 24. Air supply pipe; 25. Blower; 26. Air supply duct; 27. Conveying connector; 28. Conveying pipe; 29. ​​Fixing frame. Detailed Implementation

[0063] 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.

[0064] like Figures 1 to 10 This embodiment presents a cross-linked polyethylene insulated medium-voltage power cable with a cross-linked polyethylene conductor, comprising a cable body, which includes multiple stranded conductors 1. Each conductor 1 is covered with a cross-linked polyethylene insulation layer 2, and a fire-resistant mica layer 3 is disposed between the outside of each conductor 1 and the cross-linked polyethylene insulation layer 2. The cable also includes a wrapping layer 4, a sheath structure, a venting hose 6, a venting assembly, a heat dissipation assembly, and a venting assembly. The multiple conductors 1 are covered with a wrapping layer 4, and a filling layer 5 is disposed between the inside of the wrapping layer 4 and several conductors 1. The sheath structure is disposed outside the wrapping layer 4 to protect the power cable. The sheath structure includes an inner lining layer 7 and an outer sheath layer 9. The inner lining layer 7 is disposed outside the wrapping layer 4, and an armor layer 8 is disposed outside the inner lining layer 7. The armor layer 8 is disposed outside the outer sheath layer 9.

[0065] The conductor 1 is made of multiple copper or aluminum monofilaments that have been drawn into trapezoidal or rectangular shapes and then twisted together.

[0066] Specifically, when laying the cable, first strip both ends of the cable, then place the air-conducting components at both ends of the cable, with multiple air-conducting hoses 6 positioned between two air-conducting components and connected between them. Then, install the air-supplying component near one end of the cable and connect the output end of the air-supplying component to the air-conducting component near it. This will fix the cable to the cable tray in the cable trench. When fixing the cable to the cable tray, use a fixing bracket 29 to fix the power cable to the cable tray. When fixing the fixing bracket 29 to the cable, install a heat dissipation component at this position, then install the corresponding fixing bracket 29 on the heat dissipation component, and then install the fixing bracket 29 on the cable tray. Repeat this step until the cable is fixed.

[0067] When cooling of the cable is required, the air supply component is turned on. The air supply component sends outside air into the air duct 6 inside the cable body through an air guide component connected to the air supply component. This removes the heat transferred from the cable body to the air duct 6 and exhausts it from the air guide component at the other end. At the same time, the air exhausted from the air guide component at the other end, as well as the air supplied by the air supply component, will be sent into the heat dissipation component, thereby facilitating air circulation in the external environment of the cable and facilitating heat dissipation of the cable.

[0068] like Figures 3 to 7 As shown, multiple air-conducting hoses 6 are arranged inside the filling layer 5. Each air-conducting hose 6 corresponds to one of the multiple conductors 1 and is staggered. There are two air-conducting assemblies, with the multiple air-conducting hoses 6 located between the two air-conducting assemblies to allow air to flow within the multiple air-conducting hoses 6. Each air-conducting assembly includes an air-conducting cylinder 10, a connecting pipe 12, and a connector. Both ends of the cable body are provided with air-conducting cylinders 10. On the side of each air-conducting cylinder 10 closest to the power cable, several air-conducting connectors 11 are connected in a circular shape at equal angles. Each air-conducting hose 6 corresponds to one of the air-conducting connectors 11. One end of each air-conducting hose 6 is connected to one of the air-conducting connectors 11 on one of the air-conducting cylinders 10, and the other end of each air-conducting hose 6 is connected to one of the air-conducting connectors 11 on the other air-conducting cylinder 10. The side of each air-conducting cylinder 10 away from the cable body is connected to a connecting pipe 12. Both ends of the cable body are equipped with connectors for connecting electrical equipment.

[0069] Specifically, during the installation of the air cylinder 10, the end of the cable is first stripped, and then the air cylinder 10 is placed at the end of multiple air hoses 6. At this time, the air cylinder 10 is located outside several conductors 1, and several air connectors 11 on the side of the air cylinder 10 correspond one-to-one with the ends of several air hoses 6. Then, the air connectors 11 are connected to the corresponding air hoses 6, and the connectors are installed. The air cylinder 10 can then be installed at the end of the cable. This step is repeated to process the other end of the cable.

[0070] The above, such as Figures 5 to 7 As shown, the connector includes heat-shrinkable finger sleeves 13, terminals 14, and heat-shrinkable sheaths 15. Heat-shrinkable finger sleeves 13 are provided on the outside of both air cylinders 10. Each heat-shrinkable finger sleeve 13 includes a main body 1301, first finger sleeves 1302, and second finger sleeves 1303. The two heat-shrinkable finger sleeves 13 are located at both ends of the cable body. The main body parts 1301 of the two heat-shrinkable finger sleeves 13 respectively cover both ends of the outer sheath layer 9. Each heat-shrinkable finger sleeve 13 has several first finger sleeves 1302, each corresponding to one of several conductors 1. The first finger sleeves 1302 cover the cross-linked polyethylene insulation layer 2. Each of the retractable finger sleeves 13 is provided with a second finger sleeve 1303, which covers the connecting pipe 12. Both ends of several conductors 1 are fixedly installed with terminals 14. Each terminal 14 and the corresponding cross-linked polyethylene insulation layer 2 are covered with a heat-shrinkable sheath 15. It also includes a binding layer 16 and a support sleeve 17. The two air cylinders 10 are provided with a binding layer 16 on the side near the cable body. The binding layer 16 is located outside several conductors 1 and is in contact with the cross-linked polyethylene insulation layer 2. The two binding layers 16 are both installed with a support sleeve 17 on the outside. The outer side of the support sleeve 17 is in contact with the inside of the main body 1301 of the heat-shrinkable finger sleeve 13.

[0071] Specifically, after connecting multiple air-conducting hoses 6 to multiple air-conducting connectors 11 on the air-conducting cylinder 10, a binding layer 16 is wrapped around the area between the air-conducting cylinder 10 and the end of the outer sheath layer 9 to secure the multiple air-conducting hoses 6 and multiple conductors 1 in this area. After setting the binding layer 16, a support sleeve 17 is placed on the binding layer 16 to support the heat-shrinkable finger sleeve 13. Then, the heat-shrinkable finger sleeve 13 is fitted onto the end of the cable. At this time, as... Figure 5As shown, the main body 1301 of the heat-shrinkable finger sleeve 13 is located outside the air duct 10, the support sleeve 17, and the outer sheath layer 9. The polyethylene insulation layer outside each conductor 1 is in contact with the inner wall of the corresponding first finger sleeve 1302. The connecting tube 12 is in contact with the inner wall of the finger sleeve. Then, the terminal 14 is crimped onto the end of the conductor 1, and the heat-shrinkable sheath 15 is fitted between the terminal 14 and the polyethylene insulation layer covering the conductor 1 at the corresponding position. When connecting the cable, it can be connected to the electrical equipment through the terminal 14 at the end of the corresponding conductor 1.

[0072] like Figures 7 to 9 As shown, a heat dissipation component is installed on the sheath structure to dissipate heat from the sheath structure. The heat dissipation component includes a heat dissipation ring frame, a docking protrusion 20, a docking groove 21, an exhaust section, and an air inlet section. Several heat dissipation ring frames are evenly spaced on the outside of the outer sheath layer 9. The heat dissipation ring frame is composed of an upper positioning ring 18 and a lower positioning ring 19. Each upper positioning ring 18 and each lower positioning ring 19 has a hollow structure inside. Each upper positioning ring 18 has a docking protrusion 20 at both ends of its bottom. The two docking protrusions 20 at the bottom of each upper positioning ring 18 have docking grooves 21 at positions corresponding to the lower positioning ring 19. The hollow structure of the upper positioning ring 18 is connected to the hollow structure of the lower positioning ring 19. Each upper positioning ring 18 and each lower positioning ring 19 has an exhaust section for discharging air. Air inlets are provided between several lower positioning rings 19 to deliver air into the heat dissipation ring frame.

[0073] Specifically, when installing the heat dissipation ring frame, the matching upper positioning ring 18 and lower positioning ring 19 are placed at the designated positions on the outer sheath layer 9. At this time, the upper positioning ring 18 and lower positioning ring 19 are connected by the corresponding mating protrusion 20 of the upper positioning ring 18 and the mating groove 21 of the lower positioning ring 19. This step is repeated until the installation of all heat dissipation ring frames is completed. Then, the air inlet is installed. Through the setting of the air inlet, air is sent into the interior of multiple lower positioning rings 19. The air entering the interior of the lower positioning ring 19 will enter the upper positioning ring 18 through the setting of the mating protrusion 20 and the mating groove 21. Then, through the setting of the exhaust section, the air is blown onto the outer sheath layer 9, thereby facilitating the air circulation of the external environment of the cable and thus facilitating heat dissipation of the cable.

[0074] The above, such as Figures 7 to 9 As shown, the exhaust section includes ventilation slots 22. Each upper positioning ring 18 has several ventilation slots 22 with arc-shaped equal angles on both sides, and each lower positioning ring 19 has several ventilation slots 22 with arc-shaped equal angles on both sides.

[0075] Specifically, the ventilation slot 22 is used to discharge the air entering the upper positioning ring 18 and the lower positioning ring 19 to both sides, and the direction of air discharge is as follows: Figure 7 The connector at point B is shown in the diagram.

[0076] The above, such as Figures 7 to 9 As shown, the air inlet includes a three-way connector 23 and an air supply pipe 24. Each lower positioning ring 19 is connected to a three-way connector 23, and an air supply pipe 24 is connected between every two adjacent three-way connectors 23.

[0077] Specifically, since each lower positioning ring 19 is equipped with a T-connector 23, after the installation of the upper positioning ring 18 and the lower positioning ring 19 is completed, in order to connect multiple lower positioning rings 19, an air supply pipe 24 is connected between every two T-connectors 23.

[0078] like Figure 1 , Figure 7 , Figure 10 As shown, the air supply assembly is used to supply air to the air guiding assembly and the heat dissipation assembly. The air supply assembly includes a blower 25 and a delivery pipe 28. The output end of the blower 25 is connected to an air supply duct 26. Several delivery joints 27 are connected to the side of the air supply duct 26 away from the blower 25.

[0079] The blower 25 is located at the end near the main body of the cable. A conveying pipe 28 is connected to the tee joint 23 near the blower 25. The conveying pipe 28 is connected to one of the conveying joints 27. Of the two connecting pipes 12, the connecting pipe 12 near the blower 25 is connected to one of the conveying joints 27, and the other connecting pipe 12 is connected to the tee joint 23 away from the blower 25.

[0080] Specifically, such as Figure 7 As shown, before supplying air, a filter device is first installed at the input end of the blower 25 to filter out impurities such as dust and moisture in the air. Then, the blower 25 is turned on to send air into the air supply duct 26. The air entering the air supply duct 26 is then sent to the delivery pipe 28 and the connecting pipe 12 through the delivery connector 27. At this time, the air flow direction is as follows: Figure 7 As indicated by arrow A, the air entering the delivery pipe 28 enters the T-joint 23 closest to the blower 25 and then enters the space between the corresponding lower positioning ring 19 and upper positioning ring 18. Through the air supply pipe 24 connecting multiple T-joints 23, the air is sequentially delivered to the space between the next lower positioning ring 19 and upper positioning ring 18, and then discharged through the ventilation slots 22 on both sides of the multiple upper positioning rings 18 and lower positioning rings 19. When the air enters the air guide tube 10 and then the air in the air guide hose 6, its direction is as follows: Figure 7 As indicated by the arrow in the middle C direction, the air will enter the tee joint 23 away from the blower 25 through the connecting pipe 12 on this air guide tube 10, thereby using the exhaust air to accelerate the air circulation of the external environment of the cable, and thus facilitate the heat dissipation of the cable.

[0081] Since there are several conveying joints 27, air can be supplied for heat dissipation of multiple cables at the same time.

[0082] The working principle or usage process of this application is as follows:

[0083] During the installation of the air cylinder 10, the cable end is first stripped. Then, the air cylinder 10 is placed at the ends of multiple air hoses 6. At this time, the air cylinder 10 is located outside several conductors 1, and several air connectors 11 on the side of the air cylinder 10 correspond one-to-one with the ends of several air hoses 6. Then, the air connectors 11 are connected to the corresponding air hoses 6. Then, a binding layer 16 is wrapped around the area between the air cylinder 10 and the end of the outer sheath layer 9 to fix the multiple air hoses 6 and multiple conductors 1 in this area. After the binding layer 16 is set, a support sleeve 17 is placed on the binding layer 16 to support the heat shrink finger sleeve 13. Then, the heat shrink finger sleeve 13 is fitted onto the end of the cable. At this time, as Figure 5 As shown, the main body 1301 of the heat-shrinkable finger sleeve 13 is located outside the air duct 10, the support sleeve 17, and the outer sheath layer 9. The polyethylene insulation layer outside each conductor 1 is in contact with the inner wall of the corresponding first finger sleeve 1302. The connecting tube 12 is in contact with the inner wall of the finger sleeve. Then, the terminal 14 is crimped onto the end of the conductor 1, and the heat-shrinkable sheath 15 is fitted between the terminal 14 and the polyethylene insulation layer covering the conductor 1 at the corresponding position. When connecting the cable, it can be connected to the electrical equipment through the terminal 14 at the end of the corresponding conductor 1.

[0084] When installing the heat dissipation ring frame, place the matching upper positioning ring 18 and lower positioning ring 19 at the designated positions on the outer sheath layer 9. At this time, the upper positioning ring 18 and lower positioning ring 19 can be connected by the mating protrusion 20 of the upper positioning ring 18 corresponding to the mating groove 21 of the lower positioning ring 19. Then, install the fixing bracket 29 between the corresponding upper positioning ring 18 and lower positioning ring 19, and then install the fixing bracket 29 on the cable tray. Repeat this step until the installation of all heat dissipation ring frames is completed, and the cable can be fixed. Then, connect an air supply pipe 24 between every two tee joints 23.

[0085] When cooling of the cable is required, blower 25 is turned on to send air into the air supply duct 26. The air entering the air supply duct 26 is then sent through the conveying connector 27 to the conveying pipe 28 and the connecting pipe 12 respectively. At this time, the air flow direction is as follows: Figure 7As indicated by arrow A, the air entering the delivery pipe 28 enters the T-joint 23 closest to the blower 25 and then enters the space between the corresponding lower positioning ring 19 and upper positioning ring 18. Through the air supply pipe 24 connecting multiple T-joints 23, the air is sequentially delivered to the space between the next lower positioning ring 19 and upper positioning ring 18, and then discharged through the ventilation slots 22 on both sides of the upper and lower positioning rings 18 and 19. When the air entering the air guide tube 10 and the air in the air guide hose 6 enters the air guide tube 10 at the other end, it passes through the connecting pipe 12 on this air guide tube 10 and enters the T-joint 23 furthest from the blower 25. This utilizes the discharged air to accelerate airflow in the external environment of the cable, thereby facilitating heat dissipation for the cable.

[0086] 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 cross-linked polyethylene insulated medium-voltage power cable with a cross-linked polyethylene conductor, comprising a cable body, the cable body comprising multiple stranded conductors (1), each conductor (1) being covered with a cross-linked polyethylene insulation layer (2), and a fire-resistant mica layer (3) being disposed between the outside of each conductor (1) and the cross-linked polyethylene insulation layer (2), characterized in that, Also includes: The wrapping layer (4) is provided on the outside of the multiple conductors (1), and a filling layer (5) is provided between the inside of the wrapping layer (4) and the multiple conductors (1). Sheath structure, which is disposed outside the wrapping layer (4) for protecting the power cable; The sheath structure includes an outer sheath layer (9); The gas guiding hose (6) is provided inside the filling layer (5), and the multiple gas guiding hoses (6) correspond one-to-one with the multiple conductors (1) and are arranged in a staggered manner. An air guiding assembly is provided in two, with multiple air guiding hoses (6) located between the two air guiding assemblies for allowing air to flow within the multiple air guiding hoses (6); The air guiding assembly includes: Air guide cylinder (10), both ends of the cable body are provided with the air guide cylinder (10), and the two air guide cylinders (10) are connected by several air guide joints (11) in a circular shape at equal angles on the side near the power cable. The connecting pipe (12) is connected to the side of each of the two air cylinders (10) away from the cable body. A heat dissipation component is disposed on the sheath structure and is used to dissipate heat from the sheath structure. The heat dissipation component includes: Heat dissipation ring frame, a plurality of heat dissipation ring frames are provided at equal intervals on the outside of the outer sheath layer (9), the heat dissipation ring frame is composed of an upper positioning ring (18) and a lower positioning ring (19); An air inlet is provided between several of the lower positioning rings (19) to deliver air into the heat dissipation ring frame; The air inlet includes: Three-way connector (23), each of the lower positioning rings (19) is connected to the three-way connector (23); An air supply assembly for supplying air to the air guide assembly and the heat dissipation assembly; The gas supply assembly includes: A blower (25) has an air supply duct (26) connected to its output end, and a plurality of conveying joints (27) are connected to the side of the air supply duct (26) away from the blower (25). The blower (25) is located near the end of the cable body; The conveying pipe (28) is connected to the tee joint (23) near the blower (25), and the conveying pipe (28) is connected to one of the conveying joints (27); Of the two connecting pipes (12), the connecting pipe (12) closer to the blower (25) is connected to one of the conveying joints (27), and the other connecting pipe (12) is connected to the tee joint (23) farther away from the blower (25).

2. The cross-linked polyethylene insulated medium-voltage power cable with a profiled conductor according to claim 1, characterized in that, The sheath structure includes an inner lining layer (7), which covers the outside of the wrapping layer (4), and an armor layer (8) is provided on the outside of the inner lining layer (7), and an outer sheath layer (9) is provided on the outside of the armor layer (8).

3. The cross-linked polyethylene insulated medium-voltage power cable with a profiled conductor according to claim 2, characterized in that, The air guiding assembly also includes: The connector is installed at both ends of the cable body for connecting electrical equipment; Among them, several air guide hoses (6) correspond one-to-one with several air guide connectors (11), one end of several air guide hoses (6) is connected to several air guide connectors (11) on one of the air guide cylinders (10), and the other end of several air guide hoses (6) is connected to several air guide connectors (11) on another air guide cylinder (10).

4. A cross-linked polyethylene insulated medium-voltage power cable with a profiled conductor according to claim 3, characterized in that, The connector portion includes: Heat shrinkable finger sleeves (13) are provided on the outside of the two air tubes (10). The heat shrinkable finger sleeves (13) include a main body (1301), a first finger sleeve (1302) and a second finger sleeve (1303). The two heat shrinkable finger sleeves (13) are located at both ends of the cable body. The main body (1301) of the two heat shrinkable finger sleeves (13) are respectively covered and provided at both ends of the outer sheath layer (9). Each heat-shrinkable finger sleeve (13) is provided with a plurality of first finger sleeves (1302), and the plurality of first finger sleeves (1302) correspond one-to-one with a plurality of conductors (1), and the first finger sleeves (1302) are covered on the cross-linked polyethylene insulation layer (2); Each of the heat-shrinkable finger sleeves (13) is provided with a second finger sleeve (1303), and the second finger sleeve (1303) covers the connecting tube (12); Terminal (14) is fixedly installed at both ends of several conductors (1). Heat shrinkable sheath (15) is provided between each of the terminals (14) and the corresponding cross-linked polyethylene insulation layer (2).

5. A cross-linked polyethylene insulated medium-voltage power cable with a profiled conductor according to claim 4, characterized in that, Also includes: The binding layer (16) is provided on the side of each of the two air cylinders (10) near the cable body. The binding layer (16) is located outside of several conductors (1) and is in contact with the cross-linked polyethylene insulation layer (2). Support sleeve (17) is installed on the outside of both strap layers (16), and the outer side of the support sleeve (17) is in contact with the inside of the main body part (1301) of the heat shrink finger sleeve (13).

6. A cross-linked polyethylene insulated medium-voltage power cable with a shaped conductor according to claim 5, characterized in that, The heat dissipation component also includes: The two ends of the bottom of each upper positioning ring (18) are provided with the docking protrusion (20) and the docking groove (21). The two docking protrusions (20) at the bottom of each upper positioning ring (18) are provided with the docking groove (21) at the corresponding positions of the two docking protrusions (20) and the lower positioning ring (19). Each of the upper positioning rings (18) and each of the lower positioning rings (19) is configured with a hollow structure inside; The exhaust section is provided on each of the upper positioning rings (18) and each of the lower positioning rings (19) for discharging air.

7. A cross-linked polyethylene insulated medium-voltage power cable with a profiled conductor according to claim 6, characterized in that, The exhaust section includes ventilation slots (22). Each upper positioning ring (18) has several ventilation slots (22) with arc-shaped equal angles on both sides. Each lower positioning ring (19) has several ventilation slots (22) with arc-shaped equal angles on both sides.

8. A cross-linked polyethylene insulated medium-voltage power cable with a shaped conductor according to claim 7, characterized in that, The air inlet also includes: Air supply pipe (24), and the air supply pipe (24) is connected between every two adjacent T-joints (23).

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