A high-altitude protective power cable

Abstract

The present invention discloses a high-altitude protective power cable, which relates to the field of cable technology. A comprehensive protective component is provided on the outside of an inner insulating layer, and a spacer card box is evenly and symmetrically installed on the outside of the inner insulating layer. The inside of the spacer card box and the inside of the guide tube are filled with fire extinguishing gel blocks. Bending grooves are evenly provided on the outside of the vacuum half-tube, a first hot melt sheet is bonded to the inside of the extrusion hole, a second hot melt sheet is bonded to the inside of the true suction hole, and a lightweight card is bonded to the top of the semi-ring counterweight box. If the inside of the cable is overheated, the fire extinguishing gel block will deform and flow into the vacuum half-tube, cooling it down while flame-retarding it, reducing the chance of continued fire, and having a good flame retardant effect. If the temperature continues to rise, the aluminum hydroxide filled in the strip-shaped flame retardant bag in the flame retardant braided tube will decompose and absorb heat to extinguish the fire, further improving the fire extinguishing ability inside the cable, and the internal structure of the cable is less damaged, so it can continue to be used when a fire occurs initially, so as to facilitate maintenance personnel in later maintenance and repair.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, in particular to a high-altitude protective power cable. Background Art

[0002] High-altitude cables usually refer to overhead cables, which are overhead conductors equipped with an insulation layer and a protective sheath. Their structure combines insulation and the convenience of overhead laying. They are widely used in power transmission and urban power grid construction. Through structural optimization and technological innovation, high-altitude cables have outstanding performance in power transmission efficiency, safety and adaptability, and are an indispensable part of modern power grid construction.

[0003] However, the current in the high-altitude cables on the market is relatively large. When overloaded or heat dissipation is not smooth, they are prone to overheating and catching fire, causing damage to the cables and making them unable to be used normally. They are easily damaged by squeezing during laying, and the cables are affected by wind at high altitudes, with large swing amplitudes, causing greater wear and tear at the fixed points, reducing the service life of the cables. Summary of the Invention

[0004] The present invention provides a high-altitude protective power cable, which can effectively solve the problems raised in the above-mentioned background technology, such as the large current in the high-altitude cable, which is prone to catch fire due to overheating when overloaded or when heat dissipation is not smooth, causing the cable to be damaged and unable to be used normally, and being easily damaged by squeezing during laying. In addition, the cable is affected by wind at high altitudes, with a large swing amplitude, which causes greater wear at the fixing parts and reduces the service life of the cable.

[0005] To achieve the above object, the present invention provides the following technical solution: a high-altitude protective power cable, comprising an inner conductor, the outer side of the inner conductor is wrapped with an inner insulating layer, the outer side of the inner insulating layer is provided with a comprehensive protective component, the comprehensive protective component includes a spacer card box;

[0006] A spacer card box is evenly and symmetrically mounted on the outer side of the inner insulating layer, a guide tube is symmetrically welded through one side of the spacer card box, a guide rod is slidably mounted inside the guide tube, and an arc-shaped support sheet is welded to one end of the guide rod, and the interior of the spacer card box and the guide tube are both filled with fire extinguishing gel blocks;

[0007] The inner conductor is symmetrically sleeved with a vacuum half-tube on one side of the spacer card box, and bending grooves are evenly opened on the outside of the vacuum half-tube. The spacer card box is opened on the side close to the vacuum half-tube, and a first hot melt sheet is bonded inside the extrusion hole. The vacuum half-tube is opened at a position corresponding to the extrusion hole, and a second hot melt sheet is bonded inside the suction hole.

[0008] One end of the two vacuum half tubes is sleeved in the C-type card, and a semi-ring counterweight box is rotatably sleeved on one side of the C-type card. A counterweight roller is placed inside the semi-ring counterweight box, and a lightweight card is clamped on the top of the semi-ring counterweight box.

[0009] According to the above technical solution, the end face of the vacuum half-tube is semi-circular, and flame-retardant braided tubes are evenly distributed on the outside of the vacuum half-tube. An isolation belt is provided in the middle of the flame-retardant braided tube. One side of the isolation belt inside the flame-retardant braided tube is filled with a strip flame-retardant bag, and the inside of the strip flame-retardant bag is filled with aluminum hydroxide powder. The other side of the isolation belt inside the flame-retardant braided tube is filled with a plastic vacuum tube, and the spacer card box, semi-ring counterweight box, lightweight card and flame-retardant braided tube are all wrapped inside the middle insulating layer.

[0010] According to the above technical solution, the end face of the spacer card box is semicircular, the adjacent spacer card boxes are spliced ​​into a circular ring, the end of the guide tube is bonded with a sealing rubber ring, the inner side of the sealing rubber ring is tightly fitted to the outer side of the guide rod, and flame-retardant polyurethane blocks are filled between adjacent guide tubes.

[0011] According to the above technical solution, the end faces of the semi-ring counterweight box and the lightweight card are both semicircular, both ends of the semi-ring counterweight box are curved, and docking grooves are provided at the ends of the semi-ring counterweight box corresponding to the ends of the light card. The outer diameter of the circular ring of the combination of the semi-ring counterweight box and the lightweight card is smaller than the diameter of the outer curved surface of the arc-shaped support plate.

[0012] According to the above technical solution, the outer sides of the arc-shaped support pieces are in contact with the inner side surfaces of the middle insulating layer, and the inner side surfaces of the arc-shaped support pieces are in contact with the end surfaces of the flame-retardant polyurethane blocks.

[0013] According to the above technical solution, an outer protective component is provided outside the middle insulating layer, and the outer protective component includes a shielding layer;

[0014] The outside of the middle insulating layer is wrapped with a shielding layer, the outside of the shielding layer is evenly distributed with heat-conducting support strips, the outside of the middle insulating layer is evenly sleeved with a flame-retardant annular bag, the heat-conducting support strips and the flame-retardant annular bag are both wrapped in a metal braided layer, the outside of the metal braided layer is wrapped with an outer insulating layer, the outside of the outer insulating layer is provided with a raised edging corresponding to the flame-retardant annular bag, the outside of the raised edging is evenly provided with rupture grooves, and a reflective layer is bonded between adjacent raised edgings corresponding to the outer insulating layer.

[0015] According to the above technical solution, the interior of the flame-retardant annular bag is filled with expanded graphite, and the metal braided layer is also raised at a position corresponding to the flame-retardant annular bag.

[0016] According to the above technical solution, the heat-conducting support strip passes through the inner side of the flame-retardant annular bag, and the edges of the raised edging are rounded.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Equipped with a comprehensive protection component, when the arc-shaped support sheet is under pressure, the guide rod will squeeze the fire extinguishing gel block in the interval card box and the guide tube. The fire extinguishing gel block will deform and provide buffering, thereby improving the overall pressure resistance of the cable to prevent internal damage caused by excessive pressure;

[0019] After the cable is laid, under the action of gravity, the half-ring counterweight box faces downward, the lightweight card faces upward, and the center of the cable moves downward. When blown by the wind, due to inertia, the cable moves more than the counterweight roller, and the counterweight roller rolls in the opposite direction of the cable swing, thereby suppressing the cable swing, reducing the cable swing amplitude, reducing the wear of the cable fixing position, and extending the service life of the cable;

[0020] During the use of the cable, if the inside of the cable is overheated, the first thermal melt sheet and the second thermal melt sheet will melt due to overheating, the extrusion hole and the suction hole will be connected, and the fire extinguishing gel block will deform and flow into the vacuum half-tube, cooling it down while flame retardant, reducing the chance of continued fire, and having a good flame retardant effect. If the temperature continues to rise, the aluminum hydroxide filled in the strip flame retardant bag in the flame retardant braided tube will decompose and absorb heat to extinguish the fire, further improving the fire extinguishing ability inside the cable, and the internal structure of the cable is less damaged, so it can continue to be used when a fire occurs initially, so that maintenance personnel can perform maintenance and repairs later.

[0021] 2. An external protective component is provided. During the cable laying process, if the outer side of the cable is damaged due to scratching and friction, the flame-retardant annular bag will rupture when the metal braided layer is squeezed, and the expanded graphite powder inside the flame-retardant annular bag will be released. As the cable is continuously pulled, it will spread to the outside of the outer insulation layer. The expanded graphite powder acts as a lubricant, reducing friction damage to the outer insulation layer. The damaged location is easier to be discovered by the operator due to the presence of the expanded graphite powder, which is conducive to timely repair and avoidance of the dragging area causing the damage, thereby reducing damage caused by laying operation errors or environmental factors.

[0022] When the cable is on fire due to lightning strike or other high-temperature reasons, the raised edge will quickly break and come into contact with the external high temperature. The expanded graphite inside will expand rapidly due to the high temperature, expand and flow between the shielding layer and the metal braid, blocking the external high temperature from contacting the inside of the cable, protecting the cable interior with good protection effect. In addition, the expansion of the expanded graphite will make the high-temperature damaged area more obvious, making it easier for inspectors to find and repair it in time, ensuring the normal transmission of electricity.

[0023] In summary, the comprehensive protection component protects the inside of the cable, while the external protection component protects the outside of the cable. In the event of a high-temperature fire, the inside and outside protect the cable in different ways, so that the cable can better adapt to the environment in different environments, the cable has a better flame retardant effect, and the normal use of the cable is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] In the attached figure:

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic structural diagram of the comprehensive protection assembly of the present invention;

[0028] Figure 3 Schematic diagram of the installation structure of the arc-shaped support piece of the present invention;

[0029] Figure 4 This invention Figure 3 Schematic diagram of the A region structure;

[0030] Figure 5 This is a schematic diagram of the installation structure of the lightweight card of the present invention;

[0031] Figure 6 This is a schematic diagram of the installation structure of the counterweight roller of the present invention;

[0032] Figure 7 It is a schematic structural diagram of the outer protection assembly of the present invention;

[0033] Figure 8 This invention Figure 7 Schematic diagram of the structure of region B;

[0034] Numbers in the figure: 1, inner conductor; 2, inner insulation layer;

[0035] 3. Integrated protection assembly; 301. Spacer card box; 302. Guide tube; 303. Guide rod; 304. Arc-shaped support sheet; 305. Fire extinguishing gel block; 306. Vacuum half tube; 307. Bending groove; 308. Extrusion hole; 309. First hot melt sheet; 310. Suction hole; 311. Second hot melt sheet; 312. C-type card; 313. Half-ring counterweight box; 314. Counterweight roller; 315. Lightweight card; 316. Flame-retardant braided tube; 317. Isolation tape; 318. Flame-retardant strip bag; 319. Plastic vacuum tube; 320. Middle insulation layer; 321. Sealing rubber ring; 322. Flame-retardant polyurethane block; 323. Docking groove;

[0036] 4. External protective assembly; 401. Shielding layer; 402. Thermal conductive support strip; 403. Flame-retardant annular bag; 404. Metal braided layer; 405. External insulating layer; 406. Raised edging; 407. Rupture groove; 408. Reflective layer. DETAILED DESCRIPTION

[0037] 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.

[0038] Example: Figure 1-8 As shown, the present invention provides a technical solution for a high-altitude protective power cable, comprising an inner conductor 1, the outer side of the inner conductor 1 is wrapped with an inner insulating layer 2, the outer side of the inner insulating layer 2 is provided with a comprehensive protective assembly 3, the comprehensive protective assembly 3 includes a spacer card box 301, a guide tube 302, a guide rod 303, an arc-shaped support sheet 304, a fire extinguishing gel block 305, a vacuum half pipe 306, a bending groove 307, an extrusion hole 308, a first hot melt sheet 309, a suction hole 310, a second hot melt sheet 311, a C-shaped card 312, a semi-ring counterweight box 313, a counterweight roller 314, a lightweight card 315, a flame-retardant braided tube 316, an isolation tape 317, a strip-shaped flame-retardant bag 318, a plastic vacuum tube 319, a middle insulating layer 320, a sealing rubber ring 321, a flame-retardant polyurethane block 322 and a docking groove 323;

[0039] A spacer card box 301 is evenly and symmetrically mounted on the outside of the inner insulating layer 2. A guide tube 302 is symmetrically welded through one side of the spacer card box 301. A guide rod 303 is slidably mounted inside the guide tube 302. An arc-shaped support piece 304 is welded to one end of the guide rod 303. The interior of the spacer card box 301 and the guide tube 302 are both filled with fire extinguishing gel blocks 305.

[0040] The inner conductor 1 is symmetrically sleeved with a vacuum half-tube 306 on one side of the spacer card box 301. The outer side of the vacuum half-tube 306 is evenly provided with bending grooves 307. The spacer card box 301 has an extrusion hole 308 on the side close to the vacuum half-tube 306. A first hot melt sheet 309 is bonded inside the extrusion hole 308. The vacuum half-tube 306 has a suction hole 310 corresponding to the extrusion hole 308. A second hot melt sheet 311 is bonded inside the suction hole 310.

[0041] One end of the two vacuum half-tubes 306 are both sleeved in the C-shaped card 312, and a semi-ring counterweight box 313 is rotatably sleeved on one side of the C-shaped card 312. A counterweight roller 314 is placed inside the semi-ring counterweight box 313, and a lightweight card 315 is clamped on the top of the semi-ring counterweight box 313. The end faces of the semi-ring counterweight box 313 and the lightweight card 315 are both semicircular, and both ends of the semi-ring counterweight box 313 are curved surfaces. The two ends of the lightweight card 315 corresponding to the end of the semi-ring counterweight box 313 are provided with docking grooves 323. The outer diameter of the circular ring of the combination of the semi-ring counterweight box 313 and the lightweight card 315 is smaller than the diameter of the outer curved surface of the arc-shaped support piece 304, which is convenient for assembling the semi-ring counterweight box 313 and the lightweight card 315.

[0042] The end face of the vacuum half-tube 306 is semi-circular, and flame-retardant braided tubes 316 are evenly distributed on the outside of the vacuum half-tube 306. An isolation belt 317 is set in the middle of the flame-retardant braided tube 316. One side of the isolation belt 317 inside the flame-retardant braided tube 316 is filled with a strip flame-retardant bag 318. The strip flame-retardant bag 318 is filled with aluminum hydroxide powder. The other side of the isolation belt 317 inside the flame-retardant braided tube 316 is filled with a plastic vacuum tube 319. The spacer card box 301, the semi-ring counterweight box 313, the lightweight card 315 and the flame-retardant braided tube 316 are all wrapped Inside the middle insulating layer 320, the outer sides of the arc-shaped support pieces 304 are in contact with the inner side surfaces of the middle insulating layer 320, and the inner side surfaces of the arc-shaped support pieces 304 are in contact with the end surfaces of the flame-retardant polyurethane blocks 322, so that the arc-shaped support pieces 304 can support the middle insulating layer 320. The end surfaces of the spacer card boxes 301 are semicircular, and the adjacent spacer card boxes 301 are spliced ​​into a circular ring. The end surfaces of the guide tubes 302 are bonded with sealing rubber rings 321, and the inner sides of the sealing rubber rings 321 are tightly fitted to the outer sides of the guide rods 303. The flame-retardant polyurethane blocks 322 are filled between the adjacent guide tubes 302.

[0043] An outer protective assembly 4 is provided outside the middle insulating layer 320, and the outer protective assembly 4 includes a shielding layer 401, a heat-conducting support bar 402, a flame-retardant annular bag 403, a metal braided layer 404, an outer insulating layer 405, a raised edge 406, a rupture groove 407 and a reflective layer 408;

[0044] The outer side of the middle insulating layer 320 is wrapped with a shielding layer 401, and the outer side of the shielding layer 401 is evenly distributed with heat-conducting support strips 402. The outer side of the middle insulating layer 320 is evenly sleeved with a flame-retardant annular bag 403. The heat-conducting support strips 402 and the flame-retardant annular bag 403 are both wrapped in a metal braided layer 404. The flame-retardant annular bag 403 is filled with expanded graphite. The metal braided layer 404 is also raised at the position corresponding to the flame-retardant annular bag 403, so that the expanded graphite inside the flame-retardant annular bag 403 expands in the metal braided layer 404 when heated. The outer side of the metal braided layer 404 is wrapped with an outer insulating layer 405, and a raised edge 406 is provided on the outer side of the outer insulating layer 405 corresponding to the flame retardant annular bag 403. The heat conductive support bar 402 passes through the inner side of the flame retardant annular bag 403. The edges of the raised edge 406 are rounded to facilitate the breakage of the raised edge 406 when impacted and the outflow of expanded graphite. Rupture grooves 407 are evenly opened on the outer side of the raised edge 406. A reflective layer 408 is bonded between adjacent raised edges 406 of the outer insulating layer 405.

[0045] The working principle and usage process of the present invention are as follows: the outer side of the inner conductor 1 is wrapped with the inner insulating layer 2 through an extruder, the inside of the interval card box 301 is filled with a fire extinguishing gel block 305 through a guide tube 302, and a guide rod 303 is installed in the guide tube 302, and a sealing rubber ring 321 closes the gap at the connection between the guide tube 302 and the guide rod 303, two interval card boxes 301 are spliced ​​and clamped to the outer side of the inner insulating layer 2 at equal intervals, one side of the interval card box 301 is clamped with a vacuum half-tube 306 spliced ​​into a circular tube, and the end of the vacuum half-tube 306 away from the side of the interval card box 301 is clamped with a C-type card 312, the vacuum half-tube 306 is fixed, and the outer side of the C-type card 312 is rotated and sleeved with a semi-ring counterweight box 313 and a lightweight card 315 spliced ​​into a circular ring, filled with flame-retardant polyurethane blocks 322, and between the interval card box 301 and The flame-retardant braided tube 316 is filled between the lightweight cards 315, and then the middle insulating layer 320 is wrapped by an extruder. The shielding layer 401 is wrapped around the outside of the middle insulating layer 320. The heat-conducting support bar 402 is bonded and fixed to the outside of the shielding layer 401. The flame-retardant annular bag 403 is sleeved at equal intervals on the outside of the shielding layer 401, and the metal braided layer 404 is wrapped. Due to the support of the heat-conducting support bar 402 and the flame-retardant annular bag 403, there is a gap between the metal braided layer 404 and the shielding layer 401. Finally, the outer insulating layer 405 is wrapped by an extruder. After the outer insulating layer 405 solidifies, the outer insulating layer 405 near the flame-retardant annular bag 403 is thinner and shrinks less, while the other positions shrink more, forming a raised edge 406, opening a rupture groove 407 and bonding a reflective layer 408 to complete the cable manufacturing.

[0046] During the cable laying process, when the cable is pulled, if the outer side of the cable is damaged due to scraping and friction, and the raised edge 406 protrudes, the raised edge 406 will be broken first, and the flame-retardant annular bag 403 will be broken when the metal braided layer 404 is squeezed, and the expanded graphite powder inside the flame-retardant annular bag 403 will be scattered. As the pulling continues, it will be spread on the outside of the outer insulating layer 405. The expanded graphite powder acts as a lubricant, reducing friction damage to the outer insulating layer 405. The damaged location is easier to be discovered by the operator due to the presence of the expanded graphite powder, which is conducive to timely repair and avoidance of the dragging area causing the damage, thereby reducing damage caused by laying operation errors or environmental factors.

[0047] During cable laying, the support structure consisting of the spacer card box 301, guide tube 302, guide rod 303, arc-shaped support sheet 304 and fire extinguishing gel block 305, as well as the support structure consisting of the semi-ring counterweight box 313 and lightweight card 315, all provide internal support. When the arc-shaped support sheet 304 is under pressure, the guide rod 303 squeezes the fire extinguishing gel block 305 in the spacer card box 301 and guide tube 302. The fire extinguishing gel block 305 deforms and acts as a buffer, thereby improving the overall pressure resistance of the cable to prevent internal damage caused by excessive pressure.

[0048] After the cable is laid, under the action of gravity, the annular structure composed of the semi-ring counterweight box 313 and the light card 315 will slowly rotate outside the C-shaped card 312, so that the semi-ring counterweight box 313 faces downward, the light card 315 faces upward, and the center of the cable moves downward. When blown by the wind, due to inertia, the cable moves more than the counterweight roller 314, and the counterweight roller 314 rolls in the opposite direction of the cable swing, thereby suppressing the cable swing, reducing the cable swing amplitude, reducing the wear of the cable fixing position, and extending the service life of the cable.

[0049] During the use of the cable, if the cable is overheated and causes a fire, the first thermal fuse 309 and the second thermal fuse 311 melt due to overheating, the extrusion hole 308 and the suction hole 310 are connected, the spacer card box 301 and the vacuum half-tube 306 flow due to the internal air pressure imbalance, and the fire extinguishing gel block 305 is deformed and flows into the vacuum half-tube 306. The fire extinguishing gel block 305 is wrapped around the outside of the inner conductor 1, cooling it down while retardant, reducing the chance of further fire, and having a good flame retardant effect. If the temperature continues to rise, the aluminum hydroxide filled in the strip-shaped flame retardant bag 318 in the flame retardant braided tube 316 will decompose and absorb heat to extinguish the fire, and the plastic vacuum tube 319 will be damaged to balance the problem of excessive cable air pressure caused by the decomposition of aluminum oxide, further improving the fire extinguishing ability inside the cable, and the internal structure of the cable is less damaged. It can continue to be used when a fire occurs initially, so as to facilitate maintenance personnel to perform maintenance and repairs later.

[0050] When the cable is on fire due to lightning strike or other high-temperature reasons, the raised edge 406 will quickly rupture and come into contact with the external high temperature. The flame-retardant annular bag 403 will also rupture, and the expanded graphite inside will expand rapidly due to the high temperature. Due to the restriction of the metal braided layer 404, most of the expanded graphite will expand and flow between the shielding layer 401 and the metal braided layer 404, blocking the external high temperature from contacting the inside of the cable, protecting the inside of the cable, and achieving good protection effect. In addition, the expansion of the expanded graphite will make the high-temperature damaged area more obvious, making it easier for inspectors to discover and repair it in time, thereby ensuring the normal transmission of electricity.

[0051] The integrated protection component 3 protects the inside of the cable, while the external protection component 4 protects the outside of the cable. In the event of a high-temperature fire, the inside and outside protect the cable in different ways, so that the cable can better adapt to the environment in different environments, the cable has a better flame retardant effect, and the normal use of the cable is guaranteed.

[0052] 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 high-altitude protective power cable, comprising an inner conductor (1), characterized in that: The outer side of the inner conductor (1) is wrapped with an inner insulating layer (2), and the outer side of the inner insulating layer (2) is provided with a comprehensive protection component (3), and the comprehensive protection component (3) includes a spacer card box (301); A spacing card box (301) is evenly and symmetrically mounted on the outer side of the inner insulating layer (2); a guide tube (302) is symmetrically welded through one side of the spacing card box (301); a guide rod (303) is slidably mounted inside the guide tube (302); an arc-shaped support sheet (304) is welded to one end of the guide rod (303); and the interior of the spacing card box (301) and the interior of the guide tube (302) are both filled with a fire extinguishing gel block (305); The inner conductor (1) is symmetrically sleeved with a vacuum half-tube (306) at one side of the spacing card box (301), and bending grooves (307) are evenly opened on the outside of the vacuum half-tube (306). The spacing card box (301) is provided with an extrusion hole (308) on one side close to the vacuum half-tube (306), and a first hot melt sheet (309) is bonded inside the extrusion hole (308). The vacuum half-tube (306) is provided with a suction hole (310) corresponding to the extrusion hole (308), and a second hot melt sheet (311) is bonded inside the suction hole (310); One end of the two vacuum half tubes (306) is sleeved in a C-shaped card (312); a semi-ring counterweight box (313) is rotatably sleeved on one side of the C-shaped card (312); a counterweight roller (314) is placed inside the semi-ring counterweight box (313); and a light card (315) is clamped on the top of the semi-ring counterweight box (313).

2. A high-altitude protective power cable according to claim 1, characterized in that: The end face of the vacuum half-tube (306) is semi-annular, and a flame-retardant braided tube (316) is evenly distributed on the outside of the vacuum half-tube (306). An isolation belt (317) is provided in the middle of the flame-retardant braided tube (316). One side of the isolation belt (317) inside the flame-retardant braided tube (316) is filled with a strip-shaped flame-retardant bag (318), and the interior of the strip-shaped flame-retardant bag (318) is filled with aluminum hydroxide powder. The other side of the isolation belt (317) inside the flame-retardant braided tube (316) is filled with a plastic vacuum tube (319). The spacer card box (301), the semi-annular counterweight box (313), the lightweight card (315) and the flame-retardant braided tube (316) are all wrapped inside the middle insulating layer (320).

3. A high-altitude protective power cable according to claim 2, characterized in that: The end face of the spacer card box (301) is semicircular, and adjacent spacer card boxes (301) are spliced ​​into a circular ring. The end of the guide tube (302) is bonded with a sealing rubber ring (321), and the inner side of the sealing rubber ring (321) is tightly fitted to the outer side of the guide rod (303). The space between adjacent guide tubes (302) is filled with a flame-retardant polyurethane block (322).

4. A high-altitude protective power cable according to claim 1, characterized in that: The end faces of the semi-ring counterweight box (313) and the light card (315) are both semi-circular, both ends of the semi-ring counterweight box (313) are curved, and both ends of the light card (315) corresponding to the ends of the semi-ring counterweight box (313) are provided with docking grooves (323), and the outer diameter of the circular ring formed by the combination of the semi-ring counterweight box (313) and the light card (315) is smaller than the diameter of the outer curved surface of the arc-shaped support piece (304).

5. A high-altitude protective power cable according to claim 3, characterized in that: The outer sides of the arc-shaped support pieces (304) are in contact with the inner side surfaces of the middle insulating layer (320), and the inner side surfaces of the arc-shaped support pieces (304) are in contact with the end surfaces of the flame-retardant polyurethane blocks (322).

6. A high-altitude protective power cable according to claim 2, characterized in that: An outer protective component (4) is provided outside the middle insulating layer (320), and the outer protective component (4) includes a shielding layer (401); The outer side of the middle insulating layer (320) is wrapped with a shielding layer (401), and the outer side of the shielding layer (401) is evenly distributed with heat-conducting support strips (402). The outer side of the middle insulating layer (320) is evenly sleeved with a flame-retardant annular bag (403), and the heat-conducting support strips (402) and the flame-retardant annular bag (403) are both wrapped in a metal braided layer (404). The outer side of the metal braided layer (404) is wrapped with an outer insulating layer (405), and a raised edge (406) is provided on the outer side of the outer insulating layer (405) corresponding to the flame-retardant annular bag (403), and a rupture groove (407) is evenly provided on the outer side of the raised edge (406), and a reflective layer (408) is bonded between adjacent raised edges (406) of the outer insulating layer (405).

7. A high-altitude protective power cable according to claim 6, characterized in that: The flame retardant annular bag (403) is filled with expanded graphite, and the metal braided layer (404) is also raised at a position corresponding to the flame retardant annular bag (403).

8. The high-altitude protective power cable according to claim 6, characterized in that: The heat-conducting support strip (402) passes through the inner side of the flame-retardant annular bag (403), and the edges of the raised edging (406) are rounded.

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