Wear-resistant insulated medium voltage power cable

Abstract

This invention discloses a wear-resistant insulated medium-voltage power cable for use in the cable industry. This cable incorporates a follow-up anti-wear cable sleeve on top of an existing cable. This sleeve restricts the cable's extension and retraction within a certain range. Compared to the fixed-point fixing method in existing technologies, this effectively prevents cable wear caused by the movement of electrical equipment. The follow-up anti-wear cable sleeves, through an interlocking structure, allow the cable to extend and retract with the movement of the electrical equipment, avoiding direct contact between the cable and fixed points, thus effectively preventing wear at those points. Furthermore, in vibrating working environments, the cable's extension and retraction effectively improves environmental adaptability and extends its service life. The follow-up anti-wear cable sleeves can also automatically release after the cable is subjected to significant drag force, effectively preventing mechanical damage. Additionally, the follow-up anti-wear cable sleeves provide early warning and buffer against cable torsion, effectively improving cable safety.

Description

Technical Field

[0001] This invention relates to the field of cables, and in particular to a wear-resistant insulated medium-voltage power cable. Background Technology

[0002] Medium-voltage cables refer to power cables with rated voltages between 6kV and 35kV, mainly used for power transmission at medium voltage levels in urban power grids, industrial power distribution, mines, tunnels, etc.

[0003] The conductors inside a cable are live. If the insulation of multiple core wires is worn through, the live, neutral, and ground wires inside will come into contact with each other, causing a short circuit and posing a safety hazard to electrical equipment and people. Therefore, most existing cables adopt abrasion-resistant designs. For example, an abrasion-resistant cable with publication number CN118739123A prevents the cable from being worn at bends by avoiding deformation. Another example is an environmentally friendly abrasion-resistant cable with publication number CN110164613B, which uses a barrier ring to push away sharp rocks and has a glue storage chamber to release glue to form a protective layer after the abrasion-resistant layer is scratched.

[0004] From the perspective of existing publicly available technologies, existing wear-resistant cables are designed to prevent wear during cable laying. However, the direct connection of the cable is to electrical equipment, and the cable must ultimately connect to the electrical equipment. Industrial electrical equipment, such as CNC machine tools, robots, and automated production lines, is in motion during operation. Therefore, the cables installed on them must be fixed with cable clamps. If the cable clamps are not securely fixed, the cable will shake, and the outer sheath will be easily worn and cracked. If the clamps are too tight, they will compress the cable sheath. During dynamic movement and in vibrating working environments, the fixing point will become a wear point. Moreover, when the cable is subjected to huge drag forces, the cable will also suffer mechanical damage at the fixing point. Therefore, existing cables cannot effectively solve the problem of cable wear at the fixing point. Summary of the Invention

[0005] The core of this invention lies in solving the problem of cable wear at fixed points in existing technologies by fixing the cable in a moving manner. It also effectively buffers the drag force on the cable and provides timely warnings after the cable twists.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A wear-resistant insulated medium-voltage power cable includes a wear-resistant cable, which includes a cable body and a follower anti-wear cable sleeve connected to the cable body. The follower anti-wear cable sleeve includes an inner cylinder, a middle cylinder, and an outer cylinder that are sequentially sleeved from the inside to the outside. The outer walls of the inner cylinder and the middle cylinder are provided with multiple equally spaced grooves that are distributed around each other. Each groove has a slider that is slidably connected inside it. The slider on the inner cylinder is fixedly connected to the inner wall of the middle cylinder, and the slider on the middle cylinder is fixedly connected to the inner wall of the outer cylinder. Pressure sensors are fixedly embedded in the inner walls of both sides of the groove, and buffer elastic bands are fixedly connected between the two pressure sensors and the sliders.

[0008] Both ends of the inner cylinder are fixedly connected to the outer cylinder, and the outer end of the outer cylinder is fixedly connected to the cable fixing cylinder. The inner wall of the cable fixing cylinder is provided with multiple equally spaced arc-shaped grooves, and each arc-shaped groove is movably embedded with an electro-deformable cable fixing component. The side wall of the electro-deformable cable fixing component facing the center of the cable fixing cylinder is fixedly connected to a cable fixing pad, and the cable fixing pad is tightly fitted to the outer wall of the cable body.

[0009] The follow-up anti-abrasion cable sleeve also includes a control processor connected to a pressure sensor, and the control processor is connected to a power control unit for controlling the power supply and disconnection of the electro-deformable cable fixing component.

[0010] Furthermore, the inner cylinder, middle cylinder, and outer cylinder are all made of rigid wear-resistant material, and the elastic coefficient of the buffer elastic band on the inner cylinder is greater than that of the buffer elastic band on the middle cylinder.

[0011] Furthermore, the electro-deformable cable fixing component includes an elastic insulating sleeve, and the interior of the elastic insulating sleeve is filled with an electro-tight mesh pad.

[0012] Optionally, both ends of the electro-deformable cable fixing component and the cable fixing pad are fixedly connected to the groove wall of the arc-shaped groove, and a pressure sensor is installed between the elastic buffer pad and the groove wall of the arc-shaped groove. The follow-up anti-wear cable sleeve also includes an alarm connected to the pressure sensor.

[0013] Optionally, an annular cavity is provided on the inner wall of the extension cylinder near the cable fixing cylinder, and an air storage bladder is placed in the annular cavity. The air storage bladder is filled with high-pressure insulating gas. A through hole is provided on the inner wall of the cable fixing cylinder facing the annular cavity, and a flexible air tube is placed in the through hole that is connected to both the electrodeformable cable fixing component and the air storage bladder.

[0014] Furthermore, the inner walls of the flexible air tubes are bonded and sealed together by a hot melt adhesive layer, and an electric heating wire is embedded in the inner wall of the flexible air tubes surrounding the hot melt adhesive layer. The pressure sensor is also connected to a power control unit for controlling the on and off of the electric heating wire.

[0015] Furthermore, the sum of the inner circumferences of the multiple cable fixing pads is 0.7-0.9 times the inner circumference of the cable fixing cylinder, and the cable fixing pads are made of elastic and wear-resistant material.

[0016] Furthermore, both the outer tube and the cable fixing tube are made of rigid materials, and the inner diameter of the cable fixing tube is larger than the outer diameter of the cable body. The inner walls of the outer tube and the inner tube are also fixedly connected with elastic support nets.

[0017] Compared with the prior art, the advantages of this invention are:

[0018] (1) This solution adds a follow-up anti-wear cable sleeve to the existing cable and uses the follow-up anti-wear cable sleeve to restrict the cable to move within a certain range. Compared with the fixed-point fixing method in the existing technology, it can effectively prevent the cable from being worn by the movement of the electrical equipment. The follow-up anti-wear cable sleeve allows the cable to move with the movement of the electrical equipment through the interlocking structure, avoiding direct contact between the cable and the fixed point, thus effectively preventing the cable from being worn at the fixed point. Moreover, in the vibrating working environment, the extension and retraction of the cable can also effectively improve the environmental adaptability and effectively improve the service life.

[0019] (2) The follow-up anti-abrasion cable sleeve can also be automatically released after the cable is subjected to huge drag force, effectively preventing the cable from being mechanically damaged. In addition, the follow-up anti-abrasion cable sleeve can also provide early warning and buffer the torsion of the cable, effectively improving the safety of the cable. Attached Figure Description

[0020] Figure 1 This is a three-dimensional exploded view of the follow-up anti-wear cable sleeve of the present invention;

[0021] Figure 2 This is a diagram showing the connection relationship between the follow-up anti-wear cable sleeve and the cable clamp of the present invention;

[0022] Figure 3 This is a diagram showing the dynamic changes of the follow-up anti-abrasion cable sleeve of the present invention after being subjected to dragging force;

[0023] Figure 4 This is a side cross-sectional view of the follow-up anti-wear cable sleeve of the present invention;

[0024] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 This is a side cross-sectional view of the electrodeformable cable fixing component and flexible air tube of the present invention;

[0026] Figure 7 This is a diagram showing the state of the flexible air tube of the present invention after the hot melt adhesive layer melts when energized;

[0027] Figure 8 This is a front cross-sectional view of the cable-fixing cylinder of the present invention before the cable is twisted;

[0028] Figure 9This is a front cross-sectional view of the cable fixing cylinder of the present invention after the cable has been twisted.

[0029] Explanation of the labels in the diagram:

[0030] 1. Follow-up anti-wear cable sleeve, 101. Inner cylinder, 1011. Slide groove, 102. Middle cylinder, 103. Outer cylinder, 104. Extended cylinder, 105. Cable fixing cylinder, 2. Slider, 3. Buffer elastic band, 4. Pressure sensor one, 5. Electro-deformable cable fixing component, 501. Elastic insulating sleeve, 502. Electro-tight mesh pad, 6. Cable fixing pad, 7. Elastic buffer pad, 8. Pressure sensor two, 9. Air storage bag, 10. Flexible air tube, 1001. Heating wire, 11. Elastic support net. Detailed Implementation

[0031] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0032] First implementation method:

[0033] Please see Figures 1-4A wear-resistant insulated medium-voltage power cable includes a wear-resistant cable, which comprises a cable body and a follower-type anti-wear cable sleeve 1 connected to the cable body. The follower-type anti-wear cable sleeve 1 includes an inner cylinder 101, a middle cylinder 102, and an outer cylinder 103 sequentially sleeved from the inside out. The outer walls of the inner cylinder 101 and the middle cylinder 102 are provided with multiple equally spaced, circumferentially distributed sliding grooves 1011, and each sliding groove 1011 has a slider 2 slidably connected inside. The slider 2 located on the inner cylinder 101 is fixedly connected to the inner wall of the middle cylinder 102. The slider 2 located on the middle cylinder 102 is fixedly connected to the inner wall of the outer cylinder 103. Pressure sensors 4 are fixedly embedded on both sides of the inner wall of the slide groove 1011 (the specific model is selected according to actual needs and will not be described in detail here). A buffer elastic band 3 (preferably made of elastic metal, but other materials can be selected according to actual needs) is fixedly connected between each pressure sensor 4 and the slider 2. The cable connected to the electrical equipment and the follow-up anti-wear cable sleeve 1 are integrated and fixed to a preset fixing point by cable clamps. The fixing point can be on the bracket or on the electrical equipment, and is not limited here. When the electrical equipment is in motion, if the cable is not fixed firmly or the fixing is loose, the movement of the equipment will cause the cable to shift. In the prior art, the cable will inevitably rub against the cable clamp in this case, especially when the equipment vibrates, the cable will rub against the cable clamp at high frequency, which will cause the cable to wear. In this embodiment, the cable can be extended and retracted by the connection of the inner cylinder 101, the middle cylinder 102 and the outer cylinder 103 through mutual sleeve sliding, so as to realize the follow-up fixing method of the cable. This can not only avoid the cable directly contacting the cable clamp to avoid wear, but also prevent the cable from being mechanically damaged after being dragged by the electrical equipment. In the vibrating working environment, the buffer elastic band 3 can buffer the relative sliding between the inner cylinder 101, the middle cylinder 102 and the outer cylinder 103, thereby absorbing the energy generated by vibration and playing a role in suppressing vibration, thus effectively preventing the cable from being worn by vibration and the follow-up anti-wear cable sleeve 1.

[0034] Please see Figure 3 The inner cylinder 101, middle cylinder 102, and outer cylinder 103 are all made of rigid, wear-resistant material. The elastic coefficient of the buffer elastic band 3 on the inner cylinder 101 is greater than that on the middle cylinder 102 (the specific elastic coefficient is set according to actual needs and will not be described in detail here). The inner cylinder 101 and middle cylinder 102 can slide relative to the outer cylinder 103 to achieve the follow-up movement of the cable. Moreover, during the sliding process, the elasticity of the buffer elastic band 3 can play a certain buffering role, such as... Figure 3 As shown, the elastic coefficients of the buffer elastic bands 3 on the inner cylinder 101 and the middle cylinder 102 are distinguished so that the expansion and contraction of the inner cylinder 101, the middle cylinder 102 and the outer cylinder 103 form a stepped resistance. In a vibration working environment, this setting can significantly improve the buffering effect.

[0035] Please see Figure 4 , Figure 5 Both ends of the inner cylinder 101 are fixedly connected to the outer extension cylinder 104, and the outer end of the outer extension cylinder 104 is fixedly connected to the cable fixing cylinder 105. The inner wall of the cable fixing cylinder 105 has multiple equally spaced arc-shaped grooves, and each arc-shaped groove is movably embedded with an electro-deformable cable fixing component 5. The electro-deformable cable fixing component 5 includes an elastic insulating sleeve 501, and the elastic insulating sleeve 501 is filled with an electro-tight mesh pad 502 (which is a mesh structure made of electro-tight material and exhibits a contracted state after being energized). The side wall of the electro-deformable cable fixing component 5 facing the center of the cable fixing cylinder 105 is fixedly connected to the cable fixing pad 6, and the cable fixing pad 6 is tightly fitted to the outer wall of the cable body. Regarding the connection method between the cable and the follower anti-wear cable sleeve 1, when the cable and the cable fixing pad 1 are connected to the cable fixing cylinder 105, the cable fixing pad 6 is fixedly connected to the cable fixing cylinder 105. Before connecting the electrical equipment, first put the follower anti-abrasion cable sleeve 1 on the cable end. At this time, first energize the electrostrictive mesh pad 502. After the electrostrictive mesh pad 502 is energized, it shrinks and deforms. At this time, the electrostrictive cable fixing part 5 and the cable fixing pad 6 provide space for the cable to pass through the cable fixing tube 105. Then push the follower anti-abrasion cable sleeve 1 to the preset fixing point. Then de-energize the electrostrictive mesh pad 502. After the power is de-energized, the electrostrictive mesh pad 502 returns to its initial expanded state. At this time, the electrostrictive mesh pad 502 makes the cable fixing pad 6 press tightly on the cable. The cable fixing pad 6 fixes the cable by the clamping force. This connection method makes it convenient to install the follower anti-abrasion cable sleeve 1 at any position of the cable, so as to flexibly adapt to different fixing points.

[0036] The sum of the inner circumferences of the multiple cable fixing pads 6 is 0.7-0.9 times the inner circumference of the cable fixing cylinder 105. The cable fixing pads 6 are made of elastic and wear-resistant material. In order to achieve the best fixing effect on the cable by the follower anti-wear cable sleeve 1, the coverage area of ​​the multiple cable fixing pads 6 on the cable cannot be too small, otherwise it will not play an effective fixing role. Moreover, in order to adapt to cables of different diameters, the cable fixing pads 6 are made of elastic and wear-resistant material. This can fix cables of different sizes and specifications, effectively improving the adaptability of the follower anti-wear cable sleeve 1.

[0037] Please see Figure 4 Both the outer extension cylinder 104 and the cable fixing cylinder 105 are made of rigid materials, and the inner diameter of the cable fixing cylinder 105 is larger than the outer diameter of the cable body. The inner walls of the outer extension cylinder 104 and the inner cylinder 101 are also fixedly connected with an elastic support net 11. When the cable passes through the outer extension cylinder 104 and the inner cylinder 101, there are gaps between the cable and the inner walls of the inner cylinder 101 and the outer extension cylinder 104, which is not conducive to the fixing of the cable. Therefore, the cable is supported by the elastic support net 11, and the elastic support net 11 can also play an effective buffering role when the cable is subjected to vibration.

[0038] The follow-up anti-abrasion cable sleeve 1 also includes a control processor connected to the pressure sensor 4, and the control processor is connected to a control unit for controlling the on / off power of the electro-deformable cable fixing component 5 (the control principle and specific structure of this part are well-known to those skilled in the art and will not be described in detail here). During normal cable operation, when the cable is subjected to the drag force of other equipment or vehicles, the huge drag force causes the cable to undergo a large displacement. This displacement exceeds the total extension and retraction length of the inner cylinder 101, middle cylinder 102, and outer cylinder 103. If the follow-up anti-abrasion cable sleeve 1 is still connected to the cable at this time, it will inevitably... This causes mechanical damage to the cable. Therefore, when the inner cylinder 101 and the middle cylinder 102 extend to their farthest positions, the pressure sensors 4 at both ends are squeezed and pulled respectively, and the pressure and tension values ​​detected by the two pressure sensors 4 are at their maximum. At this time, the pressure sensor 4 immediately triggers the control processor. The control processor energizes the electrostrictive mesh pad 502 through the control unit, causing the electrostrictive mesh pad 502 to contract and deform, thereby reducing the clamping force of the cable fixing pad 6 on the cable. In this way, when the cable is subjected to an unexpected huge drag force, it can break free from the restraint of the follow-up anti-abrasion cable sleeve 1, effectively protecting the cable from being dragged and pulled.

[0039] It should be noted that the pressure and tension values ​​when pressure sensor 4 triggers electrostrictive mesh pad 502 should be set according to the actual operation requirements, and will not be specifically set here;

[0040] This embodiment adds a follow-up anti-abrasion cable sleeve 1 to the existing cable. The follow-up anti-abrasion cable sleeve 1 restricts the cable's extension and retraction within a certain range. Compared with the fixed-point fixing method in the prior art, it can effectively prevent the cable from being worn by the movement of electrical equipment. The follow-up anti-abrasion cable sleeve 1 allows the cable to extend and retract with the movement of electrical equipment through interlocking fixing, avoiding direct contact between the cable and the fixed point, thereby effectively preventing the cable from being worn at the fixed point. Moreover, in the vibrating working environment, the extension and retraction of the cable can also effectively improve environmental adaptability and effectively improve service life.

[0041] Second implementation method:

[0042] During actual operation, cables are subjected to not only drag but also twisting, which affects cable safety. Therefore, this implementation method is optimized based on the first implementation method to achieve monitoring, early warning and buffering when cable twisting occurs, while the rest remains consistent with the first implementation method.

[0043] Please see Figure 8 , Figure 9Both ends of the electro-deformable cable fixing component 5 and the cable fixing pad 6 are fixedly connected to the wall of the arc-shaped groove with elastic buffer pads 7. Pressure sensor 2 8 (specific model is selected according to actual needs and will not be described in detail here) is installed between the elastic buffer pad 7 and the wall of the arc-shaped groove. The follow-up anti-wear cable sleeve 1 also includes an alarm connected to the pressure sensor 2 8 (specific model is selected according to actual needs and will not be described in detail here). When the cable twists, the cable drives the electro-deformable cable fixing component 5 and the cable fixing pad 6 to deflect at a certain angle. At this time, the elasticity of the elastic buffer pad 7 can effectively buffer the torsion and prevent the cable from being damaged due to excessive torsion angle. When the electro-deformable cable fixing component 5 and the cable fixing pad 6 squeeze the elastic buffer pad 7 to the limit, the pressure value detected by the pressure sensor 2 8 reaches the maximum. The pressure sensor 2 8 then triggers the alarm to send a warning signal to the staff. The staff can restore the torsion state of the cable in time, effectively preventing the cable from being mechanically damaged by long-term torsional force.

[0044] Please see Figure 4 , Figure 5 , Figure 6 and Figure 7 An annular cavity is formed on the inner wall of the outer extension cylinder 104 near the cable fixing cylinder 105, and an air storage bladder 9 is placed in the annular cavity. The air storage bladder 9 is filled with high-pressure insulating gas (the specific gas pressure value is set according to actual needs and will not be specified here). A through hole is formed on the inner wall of the cable fixing cylinder 105, facing the annular cavity, and a flexible air tube 10 is placed in the through hole, which is connected to both the electrodeformable cable fixing component 5 and the air storage bladder 9. The inner walls of the flexible air tube 10 are bonded and sealed by a hot melt adhesive layer, and an electric heating wire 1001 is embedded in the inner wall of the flexible air tube 10 around the hot melt adhesive layer. The pressure sensor 8 is also connected to a control unit for controlling the on and off of the electric heating wire 1001. After the cable undergoes a large-angle twist, the elastic buffer pad 7 alone is insufficient to prevent the cable from continuing to twist. While the pressure sensor 28 triggers the alarm, it also energizes the heating wire 1001 through the power control unit. When the heating wire 1001 is not energized, the inner wall of the flexible air tube 10 is sealed by the hot melt adhesive layer to prevent the high-pressure insulating gas inside the air reservoir 9 from entering the elastic insulating sleeve 501 through the flexible air tube 10. After the heating wire 1001 is energized, the heat it generates melts the hot melt adhesive layer, and the seal is opened under the pressure of the high-pressure gas. This allows the gas inside the air reservoir 9 to fill the elastic insulating sleeve 501, thereby causing the electro-deformable cable fixing component 5 to expand further. The further expansion of the electro-deformable cable fixing component 5 increases the clamping force of the cable fixing pad 6 on the cable, thereby increasing the frictional resistance to a certain extent and preventing further twisting of the cable.

[0045] It should be noted that the pressure values ​​of the pressure sensor 28 triggering the alarm and the heating wire 1001 are set according to the actual operating requirements, and will not be specifically set here;

[0046] This embodiment enables the follow-up anti-abrasion cable sleeve 1 to automatically release after the cable is subjected to a huge drag force, effectively preventing the cable from being mechanically damaged. In addition, the follow-up anti-abrasion cable sleeve 1 also provides early warning and buffer against cable torsion, effectively improving the safety of the cable.

[0047] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A wear-resistant insulated medium-voltage power cable, comprising a wear-resistant cable, said wear-resistant cable including a cable body and a follower-type anti-wear cable sleeve (1) connected to the cable body, characterized in that: The following anti-wear cable sleeve (1) includes an inner cylinder (101), a middle cylinder (102) and an outer cylinder (103) that are sequentially sleeved from the inside to the outside. The outer walls of the inner cylinder (101) and the middle cylinder (102) are provided with multiple equally spaced grooves (1011) that are distributed around each other. Each groove (1011) is slidably connected to a slider (2). The slider (2) on the inner cylinder (101) is fixedly connected to the inner wall of the middle cylinder (102). The slider (2) on the middle cylinder (102) is fixedly connected to the inner wall of the outer cylinder (103). Pressure sensors (4) are fixedly embedded on both sides of the inner walls of the groove (1011). Buffer elastic bands (3) are fixedly connected between the two pressure sensors (4) and the slider (2). Both ends of the inner cylinder (101) are fixedly connected to the outer cylinder (104), and the outer end of the outer cylinder (104) is fixedly connected to the cable fixing cylinder (105). The inner wall of the cable fixing cylinder (105) is provided with multiple equally spaced arc-shaped grooves, and each arc-shaped groove is movably embedded with an electro-deformable cable fixing component (5). The side wall of the electro-deformable cable fixing component (5) facing the center of the cable fixing cylinder (105) is fixedly connected to a cable fixing pad (6), and the cable fixing pad (6) is tightly fitted to the outer wall of the cable body. The follow-up anti-wear cable sleeve (1) also includes a control processor that is signal-connected to the pressure sensor (4), and the control processor is signal-connected to a power control unit for controlling the power on and off of the electro-deformable cable fixing component (5).

2. The wear-resistant insulated medium-voltage power cable according to claim 1, characterized in that: The inner cylinder (101), middle cylinder (102) and outer cylinder (103) are all made of rigid wear-resistant material. The elastic coefficient of the buffer elastic band (3) on the inner cylinder (101) is greater than that on the buffer elastic band (3) on the middle cylinder (102).

3. The wear-resistant insulated medium-voltage power cable according to claim 1, characterized in that: The electro-deformable cable fixing component (5) includes an elastic insulating sleeve (501), and the interior of the elastic insulating sleeve (501) is filled with an electro-tight mesh pad (502).

4. The wear-resistant insulated medium-voltage power cable according to claim 1, characterized in that: Both ends of the electro-deformable cable fixing component (5) and the cable fixing pad (6) are fixedly connected to the wall of the arc groove with elastic buffer pads (7), and pressure sensor 2 (8) is installed between the elastic buffer pad (7) and the wall of the arc groove. The follow-up anti-wear cable sleeve (1) also includes an alarm connected to the pressure sensor 2 (8).

5. The wear-resistant insulated medium-voltage power cable according to claim 4, characterized in that: The outer tube (104) has an annular cavity on the inner wall near the cable fixing tube (105), and an air storage bag (9) is placed in the annular cavity. The air storage bag (9) is filled with high-pressure insulating gas. The inner wall of the cable fixing tube (105) has a through hole facing the annular cavity, and a flexible air tube (10) is placed in the through hole, which is connected to both the electrodeformable cable fixing member (5) and the air storage bag (9).

6. The wear-resistant insulated medium-voltage power cable according to claim 5, characterized in that: The inner walls of the flexible air tube (10) are bonded and sealed by a hot melt adhesive layer, and the flexible air tube (10) is embedded with an electric heating wire (1001) around the inner wall of the hot melt adhesive layer. The pressure sensor (8) is also connected to a power control unit for controlling the power on and off of the electric heating wire (1001).

7. The wear-resistant insulated medium-voltage power cable according to claim 1, characterized in that: The sum of the inner circumferences of the plurality of cable fixing pads (6) is 0.7-0.9 times the inner circumference of the cable fixing cylinder (105), and the cable fixing pads (6) are made of elastic and wear-resistant material.

8. The wear-resistant insulated medium-voltage power cable according to claim 1, characterized in that: Both the outer tube (104) and the cable fixing tube (105) are made of rigid material, and the inner diameter of the cable fixing tube (105) is larger than the outer diameter of the cable body. The inner walls of the outer tube (104) and the inner tube (101) are also fixedly connected with an elastic support net (11).

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