A cold-resistant 35kV power cable

Abstract

The present invention discloses a cold-resistant 35kV power cable, which relates to the field of cable technology. A thermal insulation support component is provided on the outside of an inner conductor, an inner insulating layer is coated on the outside of the inner conductor, a thermal wire is embedded in the heat conduction groove, an isolation tube is sleeved on the outside of the inner insulating layer between adjacent corrugated support tubes, support springs are evenly distributed on both sides of the isolation bracket, the other ends of two arc-shaped spring plates are respectively welded to the two ends of an air supply box, and a conductive switching component is installed between the two outer insulating layers. The inner conductor of the present invention will emit heat during the power-on process, and the heat is transferred to the spiral mica tape and the thermal conductive strip through the air. The air inlet pipe is connected to the air outlet position of the air pump. During the forced flow of air, heat is exchanged between the low-temperature area and the high-temperature area between the inner insulating layer and the outer insulating layer of the cable, so that the temperature distribution inside the cable is more uniform, and the situation of local damage to the cable caused by uneven cold and heat is prevented, so that the cable has a wider range of applications and a longer service life.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, in particular to a cold-resistant 35kV power cable. Background Art

[0002] Cables are made of one or more mutually insulated conductors and an outer insulating protective layer. They are wires that transmit electricity or information from one place to another. In order to ensure that the cable can work normally in various environments, its structure will also be changed accordingly. For example, the low-temperature and cold-resistant cable, its main feature is that it can maintain stable electrical and mechanical properties in extremely low-temperature environments, thereby ensuring the reliability and safety of power transmission or signal transmission.

[0003] However, the cold-resistant power cables currently on the market mainly rely on the particularity of the material itself to ensure cold resistance. However, due to the complex outdoor environment of the cables and the uneven temperature distribution of the cable laying sections, the locations that are more severely affected by the cold will accelerate the low-temperature damage of the insulation layer due to the lower temperature, and the locations with higher temperatures will cause overheating damage due to excessive temperature accumulation, which will cause the cable to fail to function normally. In order to maintain its cold resistance, its compression and bending resistance are difficult to meet at the same time, and the cable has a small scope of application. Summary of the Invention

[0004] The present invention provides a cold-resistant 35kV power cable, which can effectively solve the problem proposed in the above-mentioned background technology that the cold-resistant power cable mainly relies on the particularity of the material itself to ensure its cold resistance. However, due to the complex outdoor environment of the cable and the uneven temperature distribution of the cable-laid section, the low-temperature damage of the insulation layer will be accelerated due to the lower temperature in the position that is more severely affected by the cold, and the overheating damage will be caused by excessive temperature accumulation in the position with higher temperature, thereby causing the cable to fail to function normally. In addition, in order to maintain its cold resistance, its compression and bending resistance are difficult to meet the requirements at the same time, and the cable has a small scope of application.

[0005] To achieve the above object, the present invention provides the following technical solution: a cold-resistant 35kV power cable, comprising an inner conductor, an outer side of the inner conductor is provided with a thermal insulation support assembly, the thermal insulation support assembly comprising an inner insulation layer, a corrugated support tube and a porous support tube;

[0006] The outer side of the inner conductor is covered with an inner insulating layer, the outer side of the inner insulating layer is evenly provided with heat conduction grooves, and the inside of the heat conduction grooves is embedded with heat conducting wires;

[0007] The outer sides of the porous support tube and the corrugated support tube are wrapped with mica tape, the edges of the mica tape are bonded with heat-conducting strips, the outer sides of the mica tape are wrapped with an outer insulation layer, and the middle of the outer insulation layer is symmetrically installed with an arc spring plate;

[0008] One end of the two arc-shaped spring plates is connected by a fastening screw, and the other ends of the two arc-shaped spring plates are respectively welded to the two ends of the air supply box. An air inlet pipe is welded through the bottom end of the air supply box, and a valve is embedded in the air inlet pipe. An air inlet hole is opened in the outer insulation layer corresponding to the air supply box.

[0009] According to the above technical solution, the heat conducting wire is spiral-shaped, and a heat conducting sheet is connected to the outside of the heat conducting wire, and the heat conducting sheet is a flat strip.

[0010] According to the above technical solution, a corrugated support tube is evenly sleeved on the outside of the inner insulation layer, ventilation holes are evenly opened at both ends of the corrugated support tube, support rings are evenly embedded inside the corrugated support tube, an isolation tube is sleeved on the outside of the inner insulation layer between adjacent corrugated support tubes, an isolation bracket is sleeved in the middle of the isolation tube, anti-blocking holes are evenly opened on the edge of the isolation bracket, support springs are evenly distributed on both sides of the isolation bracket, and a porous support tube is sleeved on the outside of the isolation bracket.

[0011] According to the above technical solution, the two ends of the porous support tube respectively contact the top of the adjacent corrugated support tube, the outer diameter of the porous support tube is equal to the maximum outer diameter of the corrugated support tube, and the support spring squeezes the end of the corrugated support tube away from the isolation bracket;

[0012] The mica tape and the heat-conducting strip are both spiral-shaped, and the mica tape and the heat-conducting strip are staggered and spliced ​​into a cylindrical shape.

[0013] According to the above technical solution, the arc-shaped spring plate and the inner edge of the air supply box are both bonded with sealing gaskets, the end face of the air supply box is semicircular, and the air supply box is connected to the interior of the outer insulation layer through the air inlet hole.

[0014] According to the above technical solution, a conductive switching component is installed between the two outer insulating layers, and the conductive switching component includes a heat-conducting end cover;

[0015] The end of the outer insulating layer is fixedly sleeved with a heat-conducting end cover, and a conductive sheet is installed through the middle of the heat-conducting end cover corresponding to the inner conductor, and connecting holes are evenly opened near the edge of the heat-conducting end cover. Two opposite heat-conducting end covers are respectively fixedly connected to the two ends of the insulating ring, and a storage box is symmetrically installed through the middle of the insulating ring. An adjusting screw is installed at one end of one of the storage boxes through a screw hole, and the adjusting screw is located inside the insulating ring and rotatably connects to the two ends of the movable heat-conducting plate. One end of the movable heat-conducting plate is inlaid with a copper block, and the other end of the movable heat-conducting plate is inlaid with an aluminum alloy block. The top and bottom surfaces of the movable heat-conducting plate inside the insulating ring are fixedly clamped with heat-conducting limit frames, and heat-conducting metal wires are evenly distributed inside the outer insulating layer.

[0016] According to the above technical solution, a limiting mounting tube is welded to one end of the other storage box, an external threaded tube is threadedly installed inside the limiting mounting tube, and a positioning pin is slidably installed inside the external threaded tube.

[0017] According to the above technical solution, the external threaded tube and the positioning pin are connected in a transition fit manner, and a rotating ring is welded to the end of the external threaded tube away from the limiting mounting tube. The rotating ring is a regular hexagonal plate with a circular hole in the middle.

[0018] According to the above technical solution, conductive thorns are evenly distributed on the side of the conductive sheet close to the inner conductor, the copper block, aluminum alloy block and inner conductor have equal diameters, and the end faces of the copper block and aluminum alloy block are flush with the side of the movable heat conducting plate.

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

[0020] 1. It is equipped with a thermal insulation support component. There is a large gap between the inner and outer insulation layers of the cable. The cable is supported by a support ring in the corrugated support tube, an isolation tube, an isolation bracket, and a porous support tube. This improves the cable's impact resistance. When the cable is bent, the corrugated support tube and the support spring will deform and provide support to prevent excessive bending of the cable, which may cause excessive deformation of the inner conductor and change in cross-sectional shape. The cable has better impact resistance and bending resistance, higher strength, and is not easily damaged by external factors.

[0021] During the use of the cable, the inner conductor will emit heat when it is energized. The heat is transferred through the inner insulation layer to the thermal wire, then enters the gap between the corrugated support tube and the porous support tube, and is transferred through the air to the spiral mica tape and thermal strips, heating the outer insulation layer to prevent the outer insulation layer from being too cold, which will cause the insulation layer to deteriorate and cause cable loss.

[0022] An air inlet is opened in the middle of the cable at a location where the temperature is higher when the cable is laid, the air supply box is aligned with the air inlet, the fastening screw is turned, the spring plate is clamped on the outside of the cable, the sealing gasket fits tightly at the connection position, the valve is opened, and the air inlet pipe is connected to the air outlet position of the air pump. During the forced flow of air, heat is exchanged between the low-temperature area and the high-temperature area between the inner insulation layer and the outer insulation layer of the cable, making the internal temperature distribution of the cable more uniform and preventing local damage to the cable caused by uneven cold and heat. Different methods are used to protect the cable in different environments, making the cable more applicable and extending the service life of the cable.

[0023] 2. A conductive switching component is provided. During the cable laying process, if the two cable ends need to be connected, the opposite ends of the cables are sleeved with heat-conducting end caps, and the screw is adjusted to pull the movable heat-conducting plate. The movable heat-conducting plate slides along the two limit mounting tubes. The heat-conducting end caps, movable heat-conducting plate and limit mounting tubes are all made of alumina, which has good thermal conductivity and is non-conductive, ensuring safety. The copper block is placed between the two conductive sheets, and the cables are connected to ensure smooth conduction. Then the cable docking operation can be completed.

[0024] The operator turns the adjustment screw, which pulls the movable heat-conducting plate to slide again, so that the copper block between the two conductive plates at the cable connection is replaced by an aluminum alloy block. When the cable is energized, the aluminum alloy block emits more heat. The heat is sequentially transferred through the movable heat-conducting plate, the limit installation tube, the heat-conducting end cap, and finally to the outer insulation layer of the cable through the heat-conducting metal wire. The insulated heat-conducting end cap is directly exposed to the outside and will also be cooled by the external environment, preventing local overheating and damage to the cable. The cable is heated by increasing the power loss of the cable, thereby protecting the cable in a lower temperature environment.

[0025] In summary, the cable's thermal insulation support assembly provides good cold resistance while ensuring its good compression and bending resistance. The cable has a wider range of applications. The conductive switching assembly can facilitate cable docking while also cooperating with the thermal insulation support assembly. It can play a corresponding role in protecting the cable in different laying environments and at different temperatures, further expanding the application range of the cable and making the cable more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0027] In the attached figure:

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the thermal insulation support assembly of the present invention;

[0030] Figure 3 Schematic diagram of the installation structure of the thermal wire of the present invention;

[0031] Figure 4 This invention Figure 3 Schematic diagram of the A region structure;

[0032] Figure 5 Schematic diagram of the installation structure of the isolation bracket of the present invention;

[0033] Figure 6This is a schematic diagram of the installation structure of the air supply box of the present invention;

[0034] Figure 7 It is a structural schematic diagram of the conductive switching component of the present invention;

[0035] Figure 8 Schematic diagram of the installation structure of the adjusting screw of the present invention;

[0036] Figure 9 This is a schematic diagram of the installation structure of the copper block of the present invention;

[0037] Numbers in the figure: 1, inner conductor;

[0038] 2. Insulation support assembly; 201. Inner insulation layer; 202. Heat-conducting groove; 203. Thermal wire; 204. Corrugated support tube; 205. Vent; 206. Support ring; 207. Isolation tube; 208. Isolation bracket; 209. Anti-blocking hole; 210. Support spring; 211. Porous support tube; 212. Mica tape; 213. Thermal strip; 214. Outer insulation layer; 215. Arc spring plate; 216. Fastening screw; 217. Air supply box; 218. Air inlet pipe; 219. Valve; 220. Air inlet; 221. Sealing gasket;

[0039] 3. Conductive switching assembly; 301. Thermal end cap; 302. Conductive sheet; 303. Connecting hole; 304. Insulating ring; 305. Storage box; 306. Adjusting screw; 307. Movable thermal plate; 308. Copper block; 309. Aluminum alloy block; 310. Thermal limiter; 311. Thermal wire; 312. Limiting mounting tube; 313. Externally threaded tube; 314. Positioning pin. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0041] Example: Figure 1-9 As shown, the present invention provides a technical solution for a cold-resistant 35kV power cable, comprising an inner conductor 1, an outer side of the inner conductor 1 is provided with a thermal insulation support assembly 2, the thermal insulation support assembly 2 comprising an inner insulating layer 201, a heat-conducting groove 202, a heat-conducting wire 203, a corrugated support tube 204, a vent 205, a support ring 206, an isolation tube 207, an isolation bracket 208, an anti-blocking hole 209, a support spring 210, a porous support tube 211, a mica tape 212, a heat-conducting strip 213, an outer insulating layer 214, an arc-shaped spring plate 215, a fastening screw 216, an air supply box 217, an air inlet pipe 218, a valve 219, an air inlet hole 220 and a sealing gasket 221;

[0042] The outer side of the inner conductor 1 is covered with an inner insulating layer 201. The outer side of the inner insulating layer 201 is evenly provided with heat-conducting grooves 202. The inner side of the heat-conducting grooves 202 is embedded with heat-conducting wires 203. The heat-conducting wires 203 are spiral-shaped. The outer side of the heat-conducting wires 203 is connected to a heat-conducting sheet. The heat-conducting sheet is a flat strip to improve the heat conduction effect of the heat-conducting wires 203.

[0043] The outer side of the inner insulating layer 201 is evenly sleeved with a corrugated support tube 204, and ventilation holes 205 are evenly opened at both ends of the corrugated support tube 204. A support ring 206 is evenly embedded in the corrugated support tube 204. The outer side of the inner insulating layer 201 is sleeved with an isolation tube 207 between adjacent corrugated support tubes 204. An isolation bracket 208 is sleeved in the middle of the isolation tube 207. Anti-blocking holes 209 are evenly opened on the edge of the isolation bracket 208. Support springs 210 are evenly distributed on both sides of the isolation bracket 208. A porous support tube 211 is sleeved on the outer side of the isolation bracket 208. The two ends of the porous support tube 211 respectively contact the top of the adjacent corrugated support tube 204. The outer diameter of the porous support tube 211 is equal to the maximum outer diameter of the corrugated support tube 204. The support spring 210 squeezes the end of the corrugated support tube 204 away from the isolation bracket 208 to facilitate support inside the cable. The outer sides of the porous support tube 211 and the corrugated support tube 204 are wrapped with mica tape 212. The edge of the mica tape 212 is bonded with a thermal conductive strip 213. The outer side of the mica tape 212 is wrapped with an outer insulating layer 214. The mica tape 212 and the thermal conductive strip 213 are both spiral-shaped, and the mica tape 212 and the thermal conductive strip 213 are staggered and spliced ​​into a cylindrical shape, which facilitates the mica tape 212 and the thermal conductive strip 213 to be coated on the outer sides of the corrugated support tube 204 and the porous support tube 211.

[0044] An arc-shaped spring plate 215 is symmetrically installed in the middle of the outer insulating layer 214. One end of the two arc-shaped spring plates 215 is connected by a fastening screw 216. The other ends of the two arc-shaped spring plates 215 are respectively welded to the two ends of the air supply box 217. An air inlet pipe 218 is welded through the bottom end of the air supply box 217. A valve 219 is embedded inside the air inlet pipe 218. An air inlet hole 220 is opened in the outer insulating layer 214 corresponding to the air supply box 217. The inner edges of the arc-shaped spring plate 215 and the air supply box 217 are bonded with a sealing gasket 221. The end face of the air supply box 217 is semicircular. The air supply box 217 is connected to the inside of the outer insulating layer 214 through the air inlet hole 220 to ensure smooth air flow when air is forced in.

[0045] A conductive switching assembly 3 is installed between the two outer insulating layers 214. The conductive switching assembly 3 includes a heat-conducting end cap 301, a conductive sheet 302, a connecting hole 303, an insulating ring 304, a storage box 305, an adjusting screw 306, a movable heat-conducting plate 307, a copper block 308, an aluminum alloy block 309, a heat-conducting limit frame 310, a heat-conducting metal wire 311, a limit mounting tube 312, an externally threaded tube 313, and a positioning pin 314.

[0046] The end of the outer insulating layer 214 is fixedly sleeved with a heat-conducting end cover 301, and a conductive sheet 302 is installed through the middle of the heat-conducting end cover 301 corresponding to the inner conductor 1. Connecting holes 303 are evenly opened near the edge of the heat-conducting end cover 301, and two opposite heat-conducting end covers 301 are fixedly connected to the two ends of the insulating ring 304 respectively. A storage box 305 is symmetrically installed through the middle of the insulating ring 304. An adjusting screw 306 is installed at one end of the storage box 305 through a screw hole. The adjusting screw 306 is inside the insulating ring 304 and is rotatably connected to the two ends of the movable heat-conducting plate 307. One end of the movable heat-conducting plate 307 is inlaid with a copper block 308, and the other end of the movable heat-conducting plate 307 is inlaid with an aluminum alloy block 309. Conductive thorns are evenly distributed on the side of the conductive sheet 302 near the inner conductor 1. The diameters of the copper block 308, the aluminum alloy block 309 and the inner conductor 1 are equal, and the end faces of the copper block 308 and the aluminum alloy block 309 are The top and bottom surfaces of the movable heat conducting plate 307 are fixed with heat conducting limit frames 310 inside the insulating ring 304, and heat conducting wires 311 are evenly distributed inside the outer insulating layer 214. A limiting mounting tube 312 is welded at one end of the other storage box 305, and an externally threaded tube 313 is threadedly mounted inside the limiting mounting tube 312. A positioning pin 314 is slidably mounted inside the externally threaded tube 313 for temporary fixing of the cable when laying the cable. The externally threaded tube 313 and the positioning pin 314 are connected in a transitional manner. A rotating ring is welded at one end of the externally threaded tube 313 away from the limiting mounting tube 312. The rotating ring is a regular hexagonal plate with a circular hole in the middle, which is convenient for rotating the externally threaded tube 313 and adjusting the total length of the combination of the externally threaded tube 313 and the positioning pin 314.

[0047] The working principle and use process of the present invention are as follows: the inner insulating layer 201 is wrapped around the outer side of the inner conductor 1 by an injection molding machine, and a spiral heat-conducting wire 203 is wound around the inner insulating layer 201 before the inner insulating layer 201 hardens. The heat-conducting wire 203 is made of aluminum alloy, and the heat-conducting wire 203 does not exceed the outer surface of the inner insulating layer 201 when it is wound, so as to ensure the flatness of the outer side of the inner insulating layer 201, and facilitate the alternating sleeve of the corrugated support tube 204 and the isolation tube 207 outside the inner insulating layer 201. The corrugated support tube 204 and the porous support tube 211 are in a connected state. Figure 3 As shown, mica tape 212 and heat-conducting strip 213 are then wrapped around the outside of the corrugated support tube 204 and the porous support tube 211, and a number of heat-conducting metal wires 311 are placed on the outside. After that, the outer insulation layer 214 is wrapped by an injection molding machine to complete the production of the cable.

[0048] The gap between the inner insulation layer 201 and the outer insulation layer 214 of the cable is relatively large, and the cable is supported by the support ring 206 in the corrugated support tube 204 and the combination of the isolation tube 207, the isolation bracket 208 and the porous support tube 211, thereby improving the impact resistance of the cable. When the cable bends, the corrugated support tube 204 and the support spring 210 will deform and provide support to resist bending, thereby preventing excessive bending of the cable from causing excessive deformation of the inner conductor 1 and irreversible changes in the cross-sectional shape. The cable has better impact resistance and bending resistance, higher cable strength, and is not easily damaged by external factors.

[0049] When the cable is laid, if two cable ends need to be connected, the opposite ends of the cables are sleeved with the heat-conducting end caps 301. It should be noted that one end of the conductive sheet 302 is close to the exposed end of the inner conductor 1, and the adjusting screw 306 is rotated. The adjusting screw 306 pulls the movable heat-conducting plate 307, and the movable heat-conducting plate 307 slides along the two limiting mounting tubes 312. The heat-conducting end cap 301, the movable heat-conducting plate 307 and the limiting mounting tube 312 are all made of aluminum oxide, which has good thermal conductivity and is non-conductive, ensuring safety. The copper block 308 is located between the two conductive sheets 302, and the cable is connected to ensure smooth conduction. Then the cable docking operation is completed. When laying the cable, the external threaded tube 313 in the limiting mounting tube 312 is rotated so that one end of the external threaded tube 313 contacts the mounting surface, and then the positioning nail 314 is nailed into the external threaded tube 313 for temporary fixation, thereby reducing the deviation of the cable and facilitating the subsequent fixing of the laid cable.

[0050] During the use of the cable, the inner conductor 1 will emit heat when it is energized. The heat is transferred through the inner insulating layer 201 to the heat-conducting wire 203, then enters the gap between the corrugated support tube 204 and the porous support tube 211, and is transferred through the air to the spiral mica tape 212 and the heat-conducting strip 213, thereby heating the outer insulating layer 214. This prevents the outer insulating layer 214 from being overheated, which may cause the insulation layer to deteriorate and cause cable loss.

[0051] If the external environment temperature is lower and the above operation alone cannot protect the cable, the operator rotates the adjusting screw 306, and the adjusting screw 306 pulls the movable heat conducting plate 307 to slide again, so that the copper block 308 between the two conductive plates 302 at the cable connection is replaced by the aluminum alloy block 309. Since the resistance of the aluminum alloy block 309 is greater than the resistance of the copper block 308, when the cable is energized, the aluminum alloy block 309 dissipates more heat. The heat passes through the movable heat conducting plate 307, the limiting installation tube 312, and the heat conducting end cover 301 in sequence, and is finally transferred to the outer insulation layer 214 of the cable through the heat conducting metal wire 311. The insulated heat conducting end cover 301 is directly exposed to the outside and will also be cooled by the external environment, thereby preventing the cable from being damaged by local overheating. The cable is heated by increasing the power loss of the cable, thereby protecting the cable in a lower temperature environment.

[0052] If the ambient temperature for laying the cable is low and the temperature distribution at the location where the cable is laid is uneven, it is easy for the cable to be lost due to local overheating or local underheating. Then, an air inlet 220 is opened in the middle of the cable at the location where the cable is laid with a higher temperature, and the annular structure composed of the arc spring plate 215 and the air supply box 217 is clamped on the outside of the cable, and the air supply box 217 is aligned with the air inlet 220. The fastening screw 216 is rotated so that the arc spring plate 215 is clamped on the outside of the cable, and the sealing gasket 221 is tightly fitted at the connection position. The valve 219 is opened, and the air inlet pipe 218 is connected to the air outlet position of the air pump to force the air inlet 220 to be forced out. Air is fed into the gap between the inner insulating layer 201 and the outer insulating layer 214, and the air flows continuously through the anti-blocking holes 209 of the isolation bracket 208 and the vent holes 205 of the corrugated support tube 204, and is discharged from the next air inlet pipe 218. During the forced flow of air, heat is exchanged between the low-temperature area and the high-temperature area between the inner insulating layer 201 and the outer insulating layer 214 of the cable, making the temperature distribution inside the cable more uniform, preventing local damage to the cable caused by uneven temperature. Using different methods to protect the cable in different environments makes the cable more applicable and extends the service life of the cable.

[0053] In summary, the thermal insulation support component 2 of the cable provides good cold resistance while ensuring its good compression and bending resistance. The cable has a wider range of applications. The conductive switching component 3 can facilitate cable docking and can also cooperate with the thermal insulation support component 2. It can play a corresponding role in protecting the cable in different laying environments and at different temperatures, further expanding the scope of application of the cable and making the cable more convenient to use.

[0054] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cold-resistant 35kV power cable, comprising an inner conductor (1), characterized in that: A thermal insulation support assembly (2) is provided on the outside of the inner conductor (1), and the thermal insulation support assembly (2) comprises an inner insulating layer (201), a corrugated support tube (204), and a porous support tube (211); The outer side of the inner conductor (1) is covered with an inner insulating layer (201), the outer side of the inner insulating layer (201) is evenly provided with heat-conducting grooves (202), and the interior of the heat-conducting grooves (202) is embedded with heat-conducting wires (203); The outer sides of the porous support tube (211) and the corrugated support tube (204) are wrapped with a mica tape (212), the edges of the mica tape (212) are bonded with a heat-conducting strip (213), the outer sides of the mica tape (212) are wrapped with an outer insulating layer (214), and an arc-shaped spring plate (215) is symmetrically installed in the middle of the outer insulating layer (214); One end of the two arc-shaped spring plates (215) is connected by a fastening screw (216), and the other ends of the two arc-shaped spring plates (215) are respectively welded to two ends of an air supply box (217); an air inlet pipe (218) is welded through the bottom end of the air supply box (217), and a valve (219) is embedded in the air inlet pipe (218); and an air inlet hole (220) is opened in the outer insulating layer (214) corresponding to the air supply box (217); A conductive switching component (3) is installed between the two outer insulating layers (214), and the conductive switching component (3) includes a heat-conducting end cover (301); The end of the outer insulating layer (214) is fixedly sleeved with a heat-conducting end cover (301), and a conductive sheet (302) is installed through the middle of the heat-conducting end cover (301) corresponding to the inner conductor (1). The heat-conducting end cover (301) is evenly provided with connecting holes (303) near the edge. The two opposite heat-conducting end covers (301) are respectively fixedly connected to the two ends of the insulating ring (304), and a storage box (305) is symmetrically installed through the middle of the insulating ring (304). One end of the storage box (305) is installed with an adjusting screw hole. A screw (306) is provided, wherein one end of the adjusting screw (306) is located inside the insulating ring (304) and is rotatably connected to the two ends of the movable heat conducting plate (307); one end of the movable heat conducting plate (307) is inlaid with a copper block (308); the other end of the movable heat conducting plate (307) is inlaid with an aluminum alloy block (309); a heat conducting limit frame (310) is fixedly connected to the top and bottom surfaces of the movable heat conducting plate (307) inside the insulating ring (304); and heat conducting metal wires (311) are evenly distributed inside the outer insulating layer (214).

2. A cold-resistant 35kV power cable according to claim 1, characterized in that: The heat conducting wire (203) is spiral-shaped, and a heat conducting sheet is connected to the outside of the heat conducting wire (203), and the heat conducting sheet is in the shape of a flat strip.

3. A cold-resistant 35kV power cable according to claim 1, characterized in that: The outer side of the inner insulating layer (201) is evenly sleeved with a corrugated support tube (204), and ventilation holes (205) are evenly opened at both ends of the corrugated support tube (204). A support ring (206) is evenly embedded in the inner side of the corrugated support tube (204). An isolation tube (207) is sleeved between adjacent corrugated support tubes (204) on the outer side of the inner insulating layer (201). An isolation bracket (208) is sleeved in the middle of the isolation tube (207). Anti-blocking holes (209) are evenly opened on the edge of the isolation bracket (208). Support springs (210) are evenly distributed on both sides of the isolation bracket (208). The outer side of the isolation bracket (208) is sleeved with a porous support tube (211).

4. A cold-resistant 35kV power cable according to claim 3, characterized in that: Both ends of the porous support tube (211) respectively contact the top end of the adjacent corrugated support tube (204); the outer diameter of the porous support tube (211) is equal to the maximum outer diameter of the corrugated support tube (204); and the end of the support spring (210) away from the isolation bracket (208) squeezes the end of the corrugated support tube (204); The mica tape (212) and the heat-conducting strip (213) are both spiral-shaped, and the mica tape (212) and the heat-conducting strip (213) are staggered and spliced ​​into a cylindrical shape.

5. The cold-resistant 35kV power cable according to claim 1, characterized in that: The inner edges of the arc-shaped spring plate (215) and the air supply box (217) are both bonded with sealing gaskets (221). The end surface of the air supply box (217) is semicircular, and the air supply box (217) is connected to the interior of the outer insulation layer (214) through the air inlet hole (220).

6. The cold-resistant 35kV power cable according to claim 1, characterized in that: A limiting installation tube (312) is welded to one end of the other storage box (305), an external threaded tube (313) is threadedly installed inside the limiting installation tube (312), and a positioning pin (314) is slidably installed inside the external threaded tube (313).

7. A cold-resistant 35kV power cable according to claim 6, characterized in that: The externally threaded tube (313) and the positioning pin (314) are connected in a transition fit manner. A rotating ring is welded to one end of the externally threaded tube (313) away from the position limiting installation tube (312). The rotating ring is a regular hexagonal plate with a circular hole in the middle.

8. The cold-resistant 35kV power cable according to claim 6, characterized in that: Conductive thorns are evenly distributed on one side of the conductive sheet (302) close to the inner conductor (1); the copper block (308), the aluminum alloy block (309) and the inner conductor (1) have the same diameter; and the end faces of the copper block (308) and the aluminum alloy block (309) are flush with the side of the movable heat conducting plate (307).

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