Cold-resistant 35kV power cable

Abstract

The invention discloses a cold-resistant 35kV power cable, and relates to the technical field of cables, the outer side of an inner conductor is provided with a heat insulation support assembly, the outer side of the inner conductor is coated with an inner insulation layer, a heat conduction wire is embedded in a heat conduction groove, the outer side of the inner insulation layer is sleeved with an isolation pipe between adjacent corrugated support pipes, and two sides of the isolation support are uniformly provided with support springs. The inner conductor can dissipate heat in the power-on process, the heat is transferred to the spiral mica tape and the heat conduction strip through air, the air inlet pipe is connected with the air outlet position of an air pump, in the forced flowing process of air, the heat conduction switch assembly is arranged between the two arc-shaped spring plates, and the heat conduction switch assembly is arranged between the two arc-shaped spring plates. Heat exchange is carried out in a low-temperature area and a high-temperature area between the inner insulating layer and the outer insulating layer of the cable, so that the temperature distribution in the cable is more uniform, the condition of local damage of the cable caused by uneven cold and heat is prevented, the application range of the cable is wider, and the service life of the cable is longer.

Description

Technical Field

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

[0002] A cable is made of one or more mutually insulated conductors and an outer insulating protective layer, and is a wire for transmitting electric power or information from one place to another. In order to ensure that the cable can work properly in various environments, its structure will also be correspondingly changed. For example, a low-temperature resistant and cold-resistant cable, whose main feature is that it can maintain stable electrical and mechanical properties in an extremely low-temperature environment, thus ensuring the reliability and safety of power transmission or signal transmission.

[0003] However, the current cold-resistant power cables 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 cable and uneven temperature distribution in the cable-laying section, the more severely cold-affected position will accelerate the low-temperature damage of the insulating layer due to lower temperature, and the position with higher temperature will cause overheating damage due to excessive temperature accumulation, thereby resulting in the cable being unable to function properly. Moreover, in order to maintain its cold resistance, it is difficult to simultaneously meet its compressive and bending resistance, and the applicable range of the cable is small. Summary of the Invention

[0004] The present invention provides a cold-resistant 35 kV power cable, which can effectively solve the problems raised in the above background technique, that is, the cold-resistant power cable mainly relies on the particularity of the material itself to ensure cold resistance. However, due to the complex outdoor environment of the cable and uneven temperature distribution in the cable-laying section, the more severely cold-affected position will accelerate the low-temperature damage of the insulating layer due to lower temperature, and the position with higher temperature will cause overheating damage due to excessive temperature accumulation, thereby resulting in the cable being unable to function properly. Moreover, in order to maintain its cold resistance, it is difficult to simultaneously meet its compressive and bending resistance, and the applicable range of the cable is small.

[0005] To achieve the above object, the present invention provides the following technical solution: A cold-resistant 35 kV power cable includes an inner conductor, and a heat-insulating support assembly is arranged outside the inner conductor. The heat-insulating support assembly includes an inner insulating layer, a corrugated support tube, and a porous support tube; The inner conductor is coated with an inner insulating layer on the outside, and heat-conducting grooves are evenly opened on the outside of the inner insulating layer, and heat-conducting wires are embedded in the heat-conducting grooves; Mica tapes are wound around the outside of the porous support tube and the corrugated support tube. Heat-conducting strips are bonded to the edges of the mica tapes. An outer insulating layer is wrapped outside the mica tapes, and arc-shaped spring plates are symmetrically installed in the middle of the outer insulating layer; One end of the two arc spring plates is connected by a fastening screw, and the other ends of the two arc 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, a valve is embedded in the air inlet pipe, and an air inlet hole is opened in the outer insulation layer corresponding to the air supply box.

[0006] According to the above technical solution, the heat conductive wire is spiral-shaped, and a heat conductive sheet is connected to the outside of the heat conductive wire, and the heat conductive sheet is flat and strip-shaped.

[0007] According to the above technical solution, a corrugated support tube is evenly sleeved on the outer side 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 outer side 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 outer side of the isolation bracket.

[0008] 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 end of the isolation bracket; 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.

[0009] 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 inside of the outer insulation layer through the air inlet hole.

[0010] 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; A heat-conducting end cap is fixedly sleeved on the end of the outer insulating layer, a conductive sheet is installed through the middle of the heat-conducting end cap corresponding to the inner conductor, and connecting holes are evenly opened near the edge of the heat-conducting end cap, and two opposite heat-conducting end caps 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, and 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. A copper block is inlaid at one end of the movable heat-conducting plate, and an aluminum alloy block is inlaid at the other end of the movable heat-conducting plate. Heat-conducting limit frames are fixedly clamped at the top and bottom surfaces of the movable heat-conducting plate inside the insulating ring, and heat-conducting metal wires are evenly distributed inside the outer insulating layer.

[0011] According to the above technical solution, a limiting installation tube is welded to one end of the other storage box, an external threaded tube is threadedly installed inside the limiting installation tube, and a positioning pin is slidably installed inside the external threaded tube.

[0012] According to the above technical solution, the external thread tube and the positioning pin are in a transition fit connection mode. A rotating ring is welded to one end of the external thread tube away from the limit installation tube. The rotating ring is a regular hexagonal plate with a circular hole in the middle.

[0013] According to the above technical solution, conductive spikes are evenly distributed on one side of the conductive sheet close to the inner conductor. The copper block, the aluminum alloy block, and the inner conductor have the same diameter. The end faces of the copper block and the aluminum alloy block are flush with the side face of the movable heat conducting plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. There is a heat preservation support assembly. The gap between the inner insulating layer and the outer insulating layer of the cable is relatively large, and it is supported by the support ring in the corrugated support tube and the combination of the isolation tube, the isolation bracket, and the porous support tube, improving the impact resistance of the cable. When the cable is bent, both the corrugated support tube and the support spring will deform and provide support to prevent the inner conductor from deforming excessively due to excessive bending of the cable, resulting in a change in the cross-sectional shape. The cable has better impact resistance and bending resistance, higher cable strength, and is not easily damaged by the outside world; During the use of the cable, the inner conductor will generate heat during power-on. The heat is transmitted through the inner insulating layer to the heat conducting wire, then enters the gap between the corrugated support tube and the porous support tube, and is transmitted to the spiral mica tape and the heat conducting strip through air heat transfer to heat the outer insulating layer, preventing the problem of cable loss caused by the decline of the insulating layer performance due to too low temperature of the outer insulating layer; An air inlet hole is opened in the middle of the cable at a position where the cable laying temperature is relatively high. The air supply box is aligned with the air inlet hole. The fastening screw is rotated, and the spring plate is clamped outside the cable. The sealing gasket is closely attached to 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 exchange occurs between the low-temperature area and the high-temperature area between the inner insulating layer and the outer insulating layer of the cable, making the temperature distribution inside the cable more uniform and preventing the situation of local damage to the cable caused by uneven heating and cooling. Different methods are used to protect the cable in a variety of different environments, making the cable have a wider application range and a longer service life.

[0015] 2. There is a conductive switching component. During the process of laying the cable, if it is necessary to connect the ends of two cables, then the opposite ends of the cables are sleeved with heat conducting end caps. The adjusting screw pulls the movable heat conducting plate, and the movable heat conducting plate slides along the two limit installation tubes. The heat conducting end caps, the movable heat conducting plate, and the limit installation tubes are all made of alumina, which has good heat conductivity and is non-conductive, ensuring safety, making the copper block located between the two conductive sheets, connecting the cable to ensure smooth conduction, and then the docking operation of the cable can be completed; The operator rotates the adjusting screw rod, and the adjusting screw rod pulls the movable heat conducting plate to slide again, so that the copper block between the two conductive sheets at the cable connection becomes an aluminum alloy block. During the energization of the cable, the aluminum alloy block emits more heat, and the heat passes through the movable heat conducting plate, the limit installation pipe, and the heat conducting end cover in sequence, and finally is transferred to the outer insulation layer of the cable through the heat conducting metal wire. And the insulated heat conducting end cover is directly exposed outside and will also be cooled by the external environment to prevent the cable from being damaged due to local overheating. The cable is heated by increasing the power loss of the cable, thereby protecting the cable in a lower temperature environment; In summary, the heat preservation and support component of the cable provides good cold resistance while ensuring its good compressive and anti-bending properties. The cable has a wider application range. The conductive switching component can facilitate the docking of the cable and cooperate with the heat preservation and support component to play the corresponding function of protecting the cable in different laying environments and different temperatures, further expanding the application range of the cable and making the cable more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0017] In the drawings: Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the heat preservation and support component of the present invention; Figure 3 is a schematic installation structure diagram of the heat conducting wire of the present invention; Figure 4 is the present invention Figure 3 structural schematic diagram of area A; Figure 5 is a schematic installation structure diagram of the isolation bracket of the present invention; Figure 6 is a schematic installation structure diagram of the air supply box of the present invention; Figure 7 is a schematic structural diagram of the conductive switching component of the present invention; Figure 8 is a schematic installation structure diagram of the adjusting screw rod of the present invention; Figure 9 is a schematic installation structure diagram of the copper block of the present invention; Reference numerals in the figure: 1, inner conductor; 2. Thermal insulation support assembly; 201. Inner insulation layer; 202. Heat conduction groove; 203. Heat conduction wire; 204. Corrugated support tube; 205. Vent hole; 206. Support ring; 207. Isolation tube; 208. Isolation bracket; 209. Anti-blocking hole; 210. Support spring; 211. Porous support tube; 212. Mica tape; 213. Heat conduction 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 hole; 221. Sealing gasket; 3. Conductive switching assembly; 301. Heat conduction end cover; 302. Conductive sheet; 303. Communication hole; 304. Insulating ring; 305. Storage box; 306. Adjusting screw; 307. Movable heat conduction plate; 308. Copper block; 309. Aluminum alloy block; 310. Heat conduction limiting frame; 311. Heat conduction metal wire; 312. Limiting installation tube; 313. External thread tube; 314. Positioning nail. Specific implementation mode

[0018] The preferred embodiments of the present invention will be 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.

[0019] Embodiment: As Figures 1-9 shown, the present invention provides a technical solution for a cold-resistant 35 kV power cable, including an inner conductor 1. A thermal insulation support assembly 2 is arranged outside the inner conductor 1. The thermal insulation support assembly 2 includes an inner insulation layer 201, a heat conduction groove 202, a heat conduction wire 203, a corrugated support tube 204, a vent hole 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 conduction strip 213, an outer insulation layer 214, an arc 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; The inner conductor 1 is coated with an inner insulation layer 201 on the outside. Heat conduction grooves 202 are evenly arranged on the outside of the inner insulation layer 201. Heat conduction wires 203 are embedded in the heat conduction grooves 202. The heat conduction wires 203 are spiral. Heat conduction sheets are connected to the outside of the heat conduction wires 203. The heat conduction sheets are flat strips to improve the heat conduction effect of the heat conduction wires 203; 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. 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. 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 are respectively in contact with 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, which is convenient for supporting the inside of the cable. The outer sides of the porous support tube 211 and the corrugated support tube 204 are wrapped with mica tape 212, and 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 is convenient for 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; An arc spring plate 215 is symmetrically installed in the middle of the outer insulating layer 214, one end of the two arc spring plates 215 is connected by a fastening screw 216, and the other ends of the two arc spring plates 215 are respectively welded to the two ends of the air supply box 217, and an air inlet pipe 218 is welded through the bottom of the air supply box 217, and a valve 219 is embedded in 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, and a sealing gasket 221 is bonded to the inner edge of the arc spring plate 215 and the air supply box 217. The end face of the air supply box 217 is a semicircular ring, and 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 the air is forced in.

[0020] A conductive switching assembly 3 is installed between the two outer insulating layers 214, and the conductive switching assembly 3 includes a heat-conducting end cover 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 installation tube 312, an external threaded tube 313 and a positioning nail 314; A heat-conducting end cap 301 is fixedly sleeved at the end of the outer insulating layer 214. A conductive sheet 302 is installed through the middle of the heat-conducting end cap 301 corresponding to the inner conductor 1. Communication holes 303 are evenly formed near the edge of the heat-conducting end cap 301. Two opposite heat-conducting end caps 301 are respectively fixedly connected to both ends of an insulating ring 304. A storage box 305 is symmetrically installed through the middle of the insulating ring 304. One end of a storage box 305 is installed with an adjusting screw rod 306 through a screw hole. The end of the adjusting screw rod 306 inside the insulating ring 304 is rotatably connected to both ends of a movable heat-conducting plate 307. A copper block 308 is embedded at one end of the movable heat-conducting plate 307, and an aluminum alloy block 309 is embedded at the other end of the movable heat-conducting plate 307. Conductive spines are evenly distributed on the 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. The end faces of the copper block 308 and the aluminum alloy block 309 are flush with the side face of the movable heat-conducting plate 307 to ensure the flatness of the side face of the movable heat-conducting plate 307 and prevent the pulling from being blocked. Heat-conducting limiting frames 310 are fixedly clamped at the top and bottom of the movable heat-conducting plate 307 inside the insulating ring 304. Heat-conducting metal wires 311 are evenly distributed inside the outer insulating layer 214. One end of the other storage box 305 is welded with a limiting installation pipe 312. An external threaded pipe 313 is installed inside the limiting installation pipe 312 through a thread. A positioning nail 314 is slidably installed inside the external threaded pipe 313, which is convenient for temporarily fixing the cable during cable laying. The external threaded pipe 313 and the positioning nail 314 are in a transition fit connection mode. A rotating ring is welded at the end of the external threaded pipe 313 away from the limiting installation pipe 312. The rotating ring is a regular hexagon plate with a circular hole in the middle, which is convenient for rotating the external threaded pipe 313 and adjusting the total length of the combination of the external threaded pipe 313 and the positioning nail 314.

[0021] The working principle and usage process of the present invention: An inner insulating layer 201 is wrapped outside the inner conductor 1 by an injection molding machine, and a spiral heat-conducting wire 203 is wound 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 winding, so as to ensure the flatness of the outside of the inner insulating layer 201 and facilitate alternately sleeving a corrugated support pipe 204 and an isolation pipe 207 outside the inner insulating layer 201. The corrugated support pipe 204 and the porous support pipe 211 are in a communicating state. As shown above Figure 3 Next, mica tape 212 and heat-conducting strips 213 are wound outside the corrugated support pipe 204 and the porous support pipe 211, and after placing a plurality of heat-conducting metal wires 311 outside, the outer insulating layer 214 is wrapped by an injection molding machine to complete the production of the cable. There is a relatively large gap between the inner insulating layer 201 and the outer insulating layer 214 of the cable, and it is supported by a combination of a support ring 206 inside the corrugated support tube 204, an isolation tube 207, an isolation bracket 208, and a porous support tube 211, which improves the impact resistance of the cable. When the cable is bent, both the corrugated support tube 204 and the support spring 210 will deform and provide support to resist bending, preventing the inner conductor 1 from deforming excessively due to excessive bending of the cable and causing an irreversible change in the cross-sectional shape. The cable has better impact and bending resistance, higher cable strength, and is not easily damaged by the outside; During the process of laying the cable, if it is necessary to connect the ends of two cables, then sleeves of heat-conducting end caps 301 are put on the opposite ends of the cables. It should be noted that one end of the conductive sheet 302 is closely attached 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 limit mounting tubes 312. The heat-conducting end cap 301, the movable heat-conducting plate 307, and the limit mounting tubes 312 are all made of alumina, which has good heat conductivity and is non-conductive, ensuring safety. The copper block 308 is located between the two conductive sheets 302 to connect the cables to ensure smooth conduction. Subsequently, the docking operation of the cables can be completed. When laying the cable, the external thread tube 313 inside the limit mounting tube 312 is rotated so that one end of the external thread tube 313 contacts the installation surface, and then a positioning nail 314 is driven into the external thread tube 313 for temporary fixation to reduce the offset of the cable and facilitate the subsequent fixation of the laid cable; During the use of the cable, the inner conductor 1 will generate heat during power-on. The heat is transmitted through the inner insulating layer 201 to the heat-conducting wire 203, and then enters the gap between the corrugated support tube 204 and the porous support tube 211, and is transmitted to the spiral mica tape 212 and the heat-conducting strip 213 through air heat transfer to heat the outer insulating layer 214, preventing problems of cable loss caused by a decrease in the performance of the insulating layer due to too low a temperature of the outer insulating layer 214; If the external environmental temperature is even lower and the cable cannot be protected only by the above operations, 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 sheets 302 at the cable connection becomes an aluminum alloy block 309. Since the resistance of the aluminum alloy block 309 is greater than that of the copper block 308, more heat is dissipated by the aluminum alloy block 309 during the power-on of the cable. The heat is sequentially passed through the movable heat-conducting plate 307, the limit mounting tube 312, and the heat-conducting end cap 301, and finally transmitted to the outer insulating layer 214 of the cable through the heat-conducting metal wire 311. The insulating heat-conducting end cap 301 is directly exposed outside and will also be cooled by the external environment to prevent the cable from being damaged due to local overheating. The cable is heated by increasing the power loss of the cable, thereby protecting the cable in a lower temperature environment; If the ambient temperature during cable laying is low and the temperature distribution at the cable laying position is uneven, it is easy to cause cable loss due to local overheating or local low temperature of the cable. Then, an air inlet hole 220 is opened in the middle of the cable at the position with a higher cable laying temperature, and the annular structure formed by combining the arc-shaped spring plate 215 and the air supply box 217 is clamped outside the cable. The air supply box 217 is aligned with the air inlet hole 220. Rotate the fastening screw 216 so that the arc-shaped spring plate 215 is clamped outside the cable, and the sealing gasket 221 closely fits the connection position. Open the valve 219, and the air inlet pipe 218 is connected to the air outlet position of the air pump to forcibly send air into the gap between the inner insulating layer 201 and the outer insulating layer 214. The air continuously flows through the anti-blocking holes 209 of the isolation bracket 208 and the ventilation holes 205 of the corrugated support pipe 204 and is discharged from the next air inlet pipe 218. During the forced flow of air, heat exchange occurs 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 and preventing the cable from being damaged locally due to uneven heating and cooling. Different methods are used to protect the cable in various different environments, making the cable applicable to a wider range and having a longer service life; In summary, the thermal insulation and support component 2 of the cable provides good cold resistance while ensuring good compressive and anti-bending properties. The cable is applicable to a wider range. The conductive switching component 3 can facilitate the docking of the cable and cooperate with the thermal insulation and support component 2 to perform the corresponding function of protecting the cable in different laying environments and at different temperatures, further expanding the applicable range of the cable and making the cable more convenient to use.

[0022] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cold-resistant 35 kV power cable, comprising an inner conductor (1), characterized in that: A thermal insulation support assembly (2) is arranged outside 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 coated 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 inside of the heat-conducting grooves (202) is inlaid 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 edge of the mica tape (212) is bonded with a heat-conducting strip (213), the outer side of the mica tape (212) is 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); a valve (219) is embedded inside the air inlet pipe (218); and an air inlet hole (220) is opened on the outer insulating layer (214) corresponding to the air supply box (217).

2. A cold-resistant 35kV power cable according to claim 1, characterized in that: The heat-conducting wire (203) is spiral-shaped, and the outer side of the heat-conducting wire (203) is connected to a heat-conducting sheet, which 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), both ends of the corrugated support tube (204) are evenly provided with ventilation holes (205), the inner side of the corrugated support tube (204) is evenly embedded with a support ring (206), the outer side of the inner insulating layer (201) is sleeved with an isolation tube (207) between adjacent corrugated support tubes (204), the middle of the isolation tube (207) is sleeved with an isolation bracket (208), the edge of the isolation bracket (208) is evenly provided with anti-blocking holes (209), support springs (210) are evenly distributed on both sides of the isolation bracket (208), and 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 an 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. A cold-resistant 35kV power cable according to claim 1, characterized in that: The arc-shaped spring plate (215) and the inner edges of 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. A cold-resistant 35kV power cable according to claim 1, characterized in that: A conductive switching component (3) is installed between the two outer insulating layers (214), and the conductive switching component (3) comprises a heat-conducting end cover (301); The end of the outer insulating layer (214) is fixedly sleeved with a heat-conducting end cover (301), a conductive sheet (302) is installed through the middle of the heat-conducting end cover (301) corresponding to the inner conductor (1), and 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 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), and one end of the storage box (305) is installed with an adjustment screw hole. A screw (306), wherein one end of the adjusting screw (306) is located inside the insulating ring (304) and is rotatably connected to two ends of a 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), a heat conducting limit frame (310) is fixedly clamped on 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).

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

8. A cold-resistant 35kV power cable according to claim 7, 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 limiting installation tube (312); the rotating ring is a regular hexagonal plate with a circular hole in the middle.

9. A 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 equal diameters; and the end surfaces of the copper block (308) and the aluminum alloy block (309) are flush with the side surface of the movable heat conducting plate (307).

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