A puncture-proof high voltage cable

Abstract

This invention relates to the field of cable technology and proposes a breakdown-resistant high-voltage cable, comprising multiple cable segments. Each cable segment includes a conductor, a cross-linked polyethylene insulation layer, an inner sheath, and an outer sheath. It also includes connectors and a circulation pump. The connectors are used to connect adjacent cable segments. Each cable segment further includes a metal flexible tube, a heat exchange layer, a protective layer, and a wear-resistant sleeve. The metal flexible tube is fitted over the inner sheath and has heat dissipation holes. The heat exchange layer is located outside the metal flexible tube, and the protective layer is wrapped around the heat exchange layer. The wear-resistant sleeve is detachably mounted on the outside of the outer sheath. Adjacent wear-resistant sleeves are connected, and the wear-resistant sleeve is connected to the heat exchange assembly. The circulation pump drives coolant to circulate within the heat exchange assembly and the wear-resistant sleeve. This technical solution addresses the problem in existing technologies where the outer sheath of cables is easily worn or heated during installation or use, leading to breakdown and affecting the normal use of the cable.

Description

Technical Field

[0001] This invention relates to the field of cable technology, particularly polyethylene cables, and specifically, to a breakdown-resistant high-voltage cable. Background Technology

[0002] High-voltage cables are a type of power cable, mainly used to transmit electricity at high voltages, typically ranging from 1kV to 1000kV. They play a crucial role in power transmission and distribution, effectively delivering electrical energy from power plants to users. The main components of high-voltage cables include conductors, insulation layers, inner sheaths and armor, and outer sheaths. Conductors are usually made of copper or aluminum, and the commonly used material for insulation layers is cross-linked polyethylene.

[0003] Currently, cables are generally protected by an outer sheath. The insulation material is the first and most critical line of defense against breakdown. During cable laying or use, the cable insulation layer may be worn by external forces, causing damage to the original insulation performance and making it prone to breakdown. In addition, cables will heat up after prolonged use, and the breakdown voltage will drop rapidly with the extension of temperature and voltage application time. Under the action of an electric field, the dielectric will generate heat due to leakage current, electrical loss, or local gas ionization discharge in the pores, and the material temperature will gradually rise. As time goes on, the heat accumulation increases. When a certain temperature is reached, the material will crack, vitrify, or melt, and the insulation performance will be destroyed, resulting in breakdown. Moreover, thermal breakdown is generally difficult to recover from, affecting the normal use of the cable. Summary of the Invention

[0004] This invention proposes a breakdown-resistant high-voltage cable to solve the problem in the prior art where the outer sheath of the cable is easily worn or heated during laying or use, leading to breakdown and affecting the normal use of the cable.

[0005] The technical solution of the present invention is as follows: A breakdown-resistant high-voltage cable includes multiple cable segments. Each cable segment includes a conductor, a cross-linked polyethylene insulation layer, an inner sheath, and an outer sheath. The cross-linked polyethylene insulation layer wraps around the outside of the conductor, and the inner sheath is located outside the cross-linked polyethylene insulation layer. A filler is provided between the inner sheath and the cross-linked polyethylene insulation layer. The cable segment also includes a connector for connecting two adjacent cable segments. The cable segment further includes:

[0006] A flexible metal hose, which is fitted over the outer layer of the inner protective layer, and has heat dissipation holes.

[0007] A heat exchange layer, disposed outside the metal hose, is used to exchange heat and cool the metal hose. The heat exchange layer includes:

[0008] Heat exchange components, wherein multiple heat exchange components are provided, and adjacent heat exchange components are detachably connected, wherein the heat exchange components include:

[0009] A liquid reservoir ring, wherein two liquid reservoir rings are provided, and the liquid reservoir rings are fitted onto the outside of the metal hose;

[0010] A capillary tube, which connects the two liquid storage rings;

[0011] A protective layer, which wraps around the outside of the heat exchange layer, and an outer sheath, which wraps around the outside of the protective layer;

[0012] Wear-resistant sleeves, wherein multiple wear-resistant sleeves are provided, the wear-resistant sleeves are detachably disposed outside the outer sheath, two adjacent wear-resistant sleeves are connected to each other, and the wear-resistant sleeves are connected to the heat exchange assembly;

[0013] The connector includes:

[0014] A connector, which is fixedly connected to one end of the outer sheath;

[0015] A connector is fixedly connected to the other end of the outer sheath, and the connector head and the connector are plugged into each other.

[0016] A plug, wherein one end of the plug is electrically connected to the conductor;

[0017] A socket, wherein the other end of the socket is electrically connected to the conductor, and the plug and the socket are mated together.

[0018] A connecting ring is fixedly connected to the connector head and the connector seat. The connecting ring is connected to the liquid storage ring and the wear-resistant sleeve, and two adjacent connecting rings are connected.

[0019] It also includes a circulation pump, which drives the coolant to circulate inside the heat exchange assembly and the wear-resistant sleeve. The circulation pump is connected to the connecting ring through a liquid delivery pipe. The connecting ring is connected to a cooling pipe, which is connected to the circulation pump. The cooling pipe is located below ground level.

[0020] To enable the detachable installation of the wear-resistant sleeve, the wear-resistant sleeve includes two wear-resistant semi-rings. One end of each wear-resistant semi-ring is fixedly connected to a connecting plate, and the other end of each wear-resistant semi-ring has a connecting groove that matches the connecting plate. A connecting bolt is threaded onto each wear-resistant semi-ring, and a connecting hole is provided on the connecting plate for the connecting bolt to pass through.

[0021] To achieve communication between the connecting ring, the wear-resistant sleeve, and the liquid storage ring, the wear-resistant sleeve is connected to two connecting pipes. The liquid storage ring on one side of the heat exchange component is connected to a connecting head via a telescopic hose. The liquid storage ring on the other side of the heat exchange component is rotatably connected to a connecting seat via a telescopic hose. The connecting seat and the connecting head are threaded together. The connecting ring is connected to the connecting seat or the connecting head via a telescopic hose. The connecting ring is connected to multiple connecting pipes, which are respectively connected to the connecting pipe, the liquid delivery pipe, and the cooling pipe.

[0022] To improve the heat exchange efficiency of the capillary and to support the protective layer, the capillary is fixedly connected to a heat exchange plate, which is in contact with the inner wall of the protective layer.

[0023] To reduce scratches and impacts on the outer sheath from the wear-resistant sleeve, multiple buffer pads are fixedly connected to the inner side of the wear-resistant sleeve, and the buffer pads are in contact with the outer side of the outer sheath.

[0024] The working principle and beneficial effects of this invention are as follows:

[0025] 1. In this invention, a flexible metal tube with good thermal conductivity can transfer the heat generated by the conductor to the external liquid storage ring and capillary tube. The coolant is circulated in the cooling tube, wear-resistant sleeve and capillary tube by a circulation pump. The coolant in the cooling tube is cooled by the low temperature underground, so that the wear-resistant sleeve and capillary tube are in a low temperature environment. As the coolant in the capillary tube flows, it carries away the heat generated by the conductor. The coolant in the wear-resistant sleeve keeps the outside of the cable in a low temperature environment, further reducing the breakdown and aging of the cable insulation layer and outer sheath and other insulation materials.

[0026] 2. In this invention, a metal flexible tube is used to protect the internal conductor and insulation layer of the high-voltage cable, while a wear-resistant sleeve and a buffer pad are used to protect the outside of the cable. This reduces the contact between the outer sheath and external objects during cable laying, thereby reducing wear and scratches on the outer sheath, reducing the occurrence of breakdown, and ensuring the normal use of the cable. At the same time, if the wear-resistant sleeve is damaged, the individual wear-resistant sleeve can be replaced, reducing replacement costs. Attached Figure Description

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 This is a first-view structural diagram of the entire invention;

[0029] Figure 2 This is a second-view structural schematic diagram of the entire invention;

[0030] Figure 3 This is a schematic diagram of the structure of the two sets of cable segments and connectors of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of a single cable segment and connector of the present invention;

[0032] Figure 5 This is an exploded structural diagram of the cable segment and connector of the present invention;

[0033] Figure 6 This is a schematic diagram showing the disassembled structure of the cable segment of the present invention;

[0034] Figure 7 This is a schematic diagram of the connecting pipe and wear-resistant sleeve of the present invention;

[0035] Figure 8 This is a first-view structural schematic diagram of the connector of the present invention;

[0036] Figure 9 This is a second-view structural schematic diagram of the connector of the present invention;

[0037] Figure 10 This is a schematic diagram of the structure of the connecting head, connecting seat, and heat exchange assembly of the present invention;

[0038] Figure 11 For the present invention Figure 1 A magnified schematic diagram of the local structure at point A;

[0039] Figure 12 For the present invention Figure 6 A magnified schematic diagram of the structure at point B in the middle.

[0040] In the picture:

[0041] 1. Circulating pump; 2. Liquid delivery pipe; 3. Cooling pipe; 4. Connecting pipe; 5. Connecting head; 6. Connecting seat; 7. Connecting pipe;

[0042] 101. Conductor; 102. Cross-linked polyethylene insulation layer; 103. Inner sheath; 104. Outer sheath; 105. Metal flexible hose; 106. Protective layer;

[0043] 201. Liquid storage ring; 202. Capillary tube; 203. Heat exchanger plate;

[0044] 301. Wear-resistant semi-ring; 302. Connecting plate; 303. Connecting bolt; 304. Buffer pad;

[0045] 401. Connector; 402. Connector base; 403. Plug; 404. Socket; 405. Connecting ring. Detailed Implementation

[0046] 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.

[0047] like Figures 1 to 12 As shown, this embodiment proposes a breakdown-resistant high-voltage cable, comprising multiple cable segments. Each cable segment includes a conductor 101, a cross-linked polyethylene insulation layer 102, an inner sheath 103, and an outer sheath 104. Multiple conductors 101 and cross-linked polyethylene insulation layers 102 are provided, with each conductor 101 and cross-linked polyethylene insulation layer 102 corresponding to the previous one. The cross-linked polyethylene insulation layer 102 wraps around the outside of the conductor 101. The inner sheath 103 is located outside the cross-linked polyethylene insulation layer 102. A filler is provided between the inner sheath 103 and the cross-linked polyethylene insulation layer 102. The filler material can improve the cable's tensile and sway resistance. The filler material may include polypropylene rope and fiberglass yarn, which can enhance the cable's flame retardant properties and ensure the cable's safety during use. The cable segment also includes a metal flexible hose 105, a heat exchange layer, a protective layer 106, and a wear-resistant sleeve.

[0048] like Figures 1 to 12 As shown, the metal flexible hose 105 is fitted over the inner sheath 103. The metal flexible hose 105 has heat dissipation holes. The metal flexible hose 105 can be a ring-shaped corrugated metal flexible hose or a wire-threading corrugated tube, which can adapt to the bending of the cable. At the same time, it protects the inner sheath 103 and conductor 101 inside the cable, improves its bending strength, and has a certain flame-retardant effect, reducing the bending damage and breakage of the inner sheath 103 and insulation layer. The heat generated by the conductor 101 through the heat dissipation holes on the metal flexible hose 105 is transferred to the outside. In addition, the metal flexible hose 105 itself is a material with good thermal conductivity, which can accelerate the transfer of heat from the conductor 101 to the outside and exchange heat with the coolant, thereby improving the cooling effect on the cable.

[0049] like Figures 1 to 12As shown, the heat exchange layer is disposed outside the metal hose 105 for heat exchange and cooling of the metal hose 105. The heat exchange layer includes multiple heat exchange components, and adjacent heat exchange components are detachably connected. Each heat exchange component includes a liquid storage ring 201 and a capillary tube 202. Two liquid storage rings 201 are disposed and are fitted onto the outside of the metal hose 105. The capillary tube 202 connects between two liquid storage rings 201 and is fixedly connected to a heat exchange plate 203. The heat exchange plate 203 is in contact with the inner wall of the protective layer 106. Coolant flows in the capillary tube 202. Heat exchange is carried out between the coolant and the conductor 101, which is transferred by the metal hose 105, thereby achieving heat dissipation and cooling of the conductor 101. The heat exchange plate 203 facilitates heat exchange between the coolant in the capillary tube 202, the protective layer 106, and the outer sheath 104, thereby cooling the outer sheath 104 and reducing heat damage to the outer sheath 104. At the same time, the heat exchange plate 203 supports the protective layer 106 to ensure the uniformity and roundness of the cable.

[0050] The protective layer 106 is wrapped around the outside of the heat exchange layer, and the outer sheath 104 is wrapped around the outside of the protective layer 106. The protective layer 106 can be wrapped around the outside of the heat exchange layer by means of winding or other methods. The protective layer 106 can further improve the protection effect on the cable, limit the liquid storage ring 201 and capillary 202, and facilitate the subsequent extrusion production of the outer sheath 104.

[0051] like Figures 1 to 7As shown, multiple wear-resistant sleeves are provided. Each wear-resistant sleeve is detachably mounted outside the outer sheath 104, with adjacent wear-resistant sleeves connected to each other. The wear-resistant sleeves are also connected to the heat exchange assembly. To enable detachable installation of the wear-resistant sleeves, each wear-resistant sleeve includes two wear-resistant semi-rings 301. One end of each wear-resistant semi-ring 301 is fixedly connected to a connecting plate 302, and the other end of each wear-resistant semi-ring 301 has a connecting groove that matches the connecting plate 302. A connecting bolt 303 is threaded onto each wear-resistant semi-ring 301. The connecting plate 302 has a connecting hole through which the connecting bolt 303 passes. Multiple buffer pads 304 are fixedly connected to the inner side of the wear-resistant sleeve. The buffer pads 304 contact the outer side of the outer sheath 104. The connecting plate 302 is fixed inside the connecting groove by the connecting bolt 303. The two wear-resistant semi-rings 301 are connected to form a complete ring that fits over the outer sheath 104. There is a certain gap between the wear-resistant sleeve and the outer sheath 104. The buffer pad 304 is located in this gap to stabilize the wear-resistant sleeve. At the same time, the buffer pad 304 provides cushioning protection for the outer sheath 104, reducing scratches on the outer sheath 104. The buffer pad 304 also absorbs and releases external impact energy, reducing damage to the outer sheath 104 caused by external impacts. When the wear-resistant sleeve is damaged, loosening the connecting bolt 303 can release the limiting position on the connecting plate 302, allowing the wear-resistant sleeve to be disassembled and replaced, saving replacement costs. Furthermore, the wear-resistant sleeve protects the outer sheath 104 from external contact, reducing wear and collisions on the outer sheath 104 during installation.

[0052] like Figures 1 to 9As shown, the system also includes a connector for connecting two adjacent cable segments. The connector includes a connector 401, a connector 402, a plug 403, a socket 404, and a connecting ring 405. The connector 401 is fixedly connected to one end of the outer sheath 104, and the connector 402 is fixedly connected to the other end of the outer sheath 104. The connector 401 and the connector 402 are plugged into each other. The plug 403 is electrically connected to one end of the conductor 101, and the socket 404 is electrically connected to the other end of the conductor 101. The plug 403 and the socket 404 are plugged into each other. Both the plug 403 and the socket 404 are made of metal and can be connected to the conductor 101. Electrical connection is achieved by plugging in plug 403 and socket 404 to connect adjacent conductors 101, enabling power transmission. A suitable number of cable segments are selected and connected according to power transmission needs, splicing the cable segments to different lengths. Connector 401 and connector 402 are plugged in, and both connector 401 and connector 402 are made of insulating material to insulate plug 403 and socket 404, preventing circuit leakage. Connector 401 and connector 402 are detachably connected by fixing bolts. Connecting ring 405 is fixedly connected to connector 401 and connector 402, and is connected to the liquid storage ring 201 and the wear-resistant sleeve. Adjacent connecting rings 405 are connected.

[0053] like Figures 1 to 12As shown, it also includes a circulation pump 1, which drives the coolant to circulate inside the heat exchange assembly and the wear-resistant sleeve. The circulation pump 1 is connected to the connecting ring 405 via a liquid delivery pipe 2. The connecting ring 405 is connected to a cooling pipe 3, which is connected to the circulation pump 1. The cooling pipe 3 is located below ground level. To achieve communication between the connecting ring 405, the wear-resistant sleeve, and the liquid storage ring 201, the wear-resistant sleeve is connected to two connecting pipes 4. The two connecting pipes 4 on adjacent wear-resistant sleeves are connected via hoses and quick connectors, allowing communication between adjacent wear-resistant sleeves. The liquid storage ring 201 on one side of the heat exchange assembly is connected to a connecting head 5 via a telescopic hose. The liquid storage ring 201 on the other side of the heat exchange assembly is rotatably connected to a connecting seat 6 via a telescopic hose. The connecting seat 6 and the connecting head 5 are threadedly connected. This threaded connection allows the liquid storage rings 201 in adjacent heat exchange assemblies to communicate with each other. The connecting ring 405 is connected to either the connecting seat 6 or the connecting head 5 via a telescopic hose. The connecting ring 405 mounted on the connecting seat 402 is connected to the connecting seat 6 via a telescopic hose. A connecting ring 405 mounted on a connector 401 is connected to a connecting head 5 via a telescopic hose. The connecting ring 405 is connected to multiple connecting pipes 7. Two connecting pipes 7 on adjacent connecting rings 405 are connected via a hose and a quick connector. The multiple connecting pipes 7 are respectively connected to the connecting pipe 4, the liquid delivery pipe 2, and the cooling pipe 3. Two liquid storage rings 201 located at both ends are respectively connected to a connecting seat 6 and a connecting head 5. The liquid storage rings 201 are sequentially connected along a specific direction, communicating with the liquid storage rings 201 through the connecting head 5 or the connecting seat 6 on the connecting ring 405. The tube and quick-connector connect the connecting ring and the connecting tube 4 on the wear-resistant sleeve. The connecting tube 7 at one end of the high-voltage cable and the liquid delivery tube 2 or cooling tube 3 are connected through the hose and quick-connector. The quick-connectors on the two connecting tubes 7 at the other end are sealed. The coolant in the cooling tube 3 is delivered to the inside of the connecting ring 405 by the circulating pump 1, and then enters the inside of the wear-resistant sleeve, the liquid storage ring 201 and the capillary tube 202 to cool the inside and outside of the high-voltage cable and reduce the thermal shock phenomenon of the high-voltage cable. After circulating once in the wear-resistant sleeve, the liquid storage ring 201 and the capillary tube 202, the coolant flows back to the cooling tube 3 for recycling.

[0054] The working principle or usage process of this breakdown-resistant high-voltage cable is as follows:

[0055] Select an appropriate number of cable segments according to the usage requirements, insert the plug 403 into the inside of the socket 404, insert the connector 401 into the inside of the connector 402, connect multiple cable segments, and put the wear-resistant half ring 301 on the outside of the outer sheath 104. The distance between adjacent wear-resistant sleeves can be adjusted. Connect the connecting pipe 4 on the wear-resistant sleeve through the hose and quick connector to realize the connection between multiple wear-resistant sleeves. Then connect the connector 401 and the connecting pipe 7 at the end through the hose and quick connector to realize the connection between the wear-resistant sleeve and the connecting ring 405. Connect the connecting pipe 7 on the two adjacent connecting rings 405 through the hose and quick connector. The wear-resistant sleeve provides wear-resistant protection to the outside of the outer sheath 104.

[0056] The circulating pump 1 delivers the coolant in the cooling pipe 3 to the inside of the connecting ring 405, and then to the inside of the wear-resistant sleeve, the liquid storage ring 201 and the capillary tube 202 before flowing back to the inside of the cooling pipe 3. The cooling pipe 3 is located underground, and the coolant in the cooling pipe 3 is cooled by the low temperature environment underground, so as to ensure the cooling effect of the coolant on the cable and reduce the thermal breakdown of the high-voltage cable.

[0057] 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 breakdown-resistant high-voltage cable, comprising multiple cable segments, each cable segment including a conductor (101), a cross-linked polyethylene insulation layer (102), an inner sheath (103), and an outer sheath (104), wherein the cross-linked polyethylene insulation layer (102) wraps around the conductor (101), the inner sheath (103) is located outside the cross-linked polyethylene insulation layer (102), and a filler is disposed between the inner sheath (103) and the cross-linked polyethylene insulation layer (102), characterized in that, It also includes a connector and a circulation pump (1), the connector being used to connect two adjacent cable segments; The cable segment also includes a metal flexible tube (105), a heat exchange layer, a protective layer (106), and a wear-resistant sleeve; The metal flexible hose (105) is fitted over the outer side of the inner protective layer (103), and the metal flexible hose (105) has heat dissipation holes. The heat exchange layer is disposed on the outside of the metal hose (105) for heat exchange and cooling of the metal hose (105). The heat exchange layer includes heat exchange components, and multiple heat exchange components are provided. Adjacent heat exchange components are detachably connected. Each heat exchange component includes: A liquid storage ring (201), two of which are provided, are fitted onto the outside of the metal hose (105); A capillary tube (202) is connected between the two liquid storage rings (201); The protective layer (106) wraps around the outside of the heat exchange layer, and the outer sheath (104) wraps around the outside of the protective layer (106); Multiple wear-resistant sleeves are provided. The wear-resistant sleeves are detachably disposed outside the outer sheath (104). Two adjacent wear-resistant sleeves are connected to each other. The wear-resistant sleeves are connected to the heat exchange assembly. The circulating pump (1) is used to drive the coolant to circulate inside the heat exchange assembly and the wear-resistant sleeve; The connector includes: Connector (401), the connector (401) is fixedly connected to one end of the outer sheath (104); Connecting seat (402), the connecting seat (402) is fixedly connected to the other end of the outer sheath (104), the connector (401) and the connecting seat (402) are in a plug-in fit; A plug (403) is electrically connected to one end of the conductor (101); A socket (404) is electrically connected to the other end of the conductor (101), and the plug (403) is plugged into the socket (404). A connecting ring (405) is fixedly connected to the connector (401) and the connector (402). The connecting ring (405) is connected to the liquid storage ring (201) and the wear-resistant sleeve. Two adjacent connecting rings (405) are connected. The circulating pump (1) is connected to the connecting ring (405) through the liquid delivery pipe (2), and the connecting ring (405) is connected to the cooling pipe (3). The cooling pipe (3) is connected to the circulating pump (1), and the cooling pipe (3) is installed below the ground. The wear-resistant sleeve is connected to two connecting pipes (4). The liquid storage ring (201) on one side of the heat exchange component is connected to a connecting head (5) through a telescopic hose. The liquid storage ring (201) on the other side of the heat exchange component is rotatably connected to a connecting seat (6) through a telescopic hose. The connecting seat (6) and the connecting head (5) are threaded together. The connecting ring (405) is connected to the connecting seat (6) or the connecting head (5) through a telescopic hose. The connecting ring (405) is connected to multiple connecting pipes (7). The multiple connecting pipes (7) are respectively connected to the connecting pipe (4), the liquid delivery pipe (2), and the cooling pipe (3). The capillary tube (202) is fixedly connected to a heat exchange plate (203), and the heat exchange plate (203) is in contact with the inner wall of the protective layer (106).

2. The high-voltage cable with breakdown protection according to claim 1, characterized in that, The wear-resistant sleeve includes two wear-resistant semi-rings (301). One end of the wear-resistant semi-ring (301) is fixedly connected to a connecting plate (302). The other end of the wear-resistant semi-ring (301) is provided with a connecting groove that matches the connecting plate (302). A connecting bolt (303) is threaded onto the wear-resistant semi-ring (301). A connecting hole is provided on the connecting plate (302) for the connecting bolt (303) to pass through.

3. A breakdown-resistant high-voltage cable according to claim 2, characterized in that, Multiple buffer pads (304) are fixedly connected to the inner side of the wear-resistant sleeve, and the buffer pads (304) are in contact with the outer side of the outer sleeve (104).

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