A high flame-retardant insulation medium-voltage power cable for substation maintenance

Abstract

The application provides a high-flame-retardant insulating medium-voltage power cable for power transformation and maintenance, which comprises a cable core body, an inner protective layer, a functional layer and an armor. The inner protective layer is provided with an insulation shielding layer and a cooling layer. The insulation shielding layer is a continuous extrusion-coated semiconductive crosslinked polyethylene layer, which is completely coated outside the cable core body without any breakpoint. The insulation shielding layer is provided with an isolation cabin, which is a segmented type and can be set at intervals along the axial direction of the cable. The insulation shielding layer and the cooling layer are clamped with an elastomer composite layer. The functional layer is provided with the armor. The armor is a stainless steel belt structure with spiral bidirectional concave-convex anchoring tooth grooves punched on the surface. Through the coupling structure design of the isolation cabin and the cooling layer, the efficient heat dissipation and the graded flame-retardant protection of the cable are simultaneously realized. The inherent contradiction between the flame-retardant and heat dissipation performance in the prior art is solved. When a fire occurs, the segmented airtight oxygen-blocking flame-retardant function can be realized to block the axial spread of the flame, which greatly improves the flame-retardant protection reliability and the operating thermal stability of the cable.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and in particular to a high flame-retardant insulated medium-voltage power cable for substation maintenance. Background Technology

[0002] In power system substation maintenance, medium-voltage power cables are core components for equipment connection, temporary power supply, and maintenance testing. Their operational safety and adaptability directly determine the efficiency of substation maintenance and the safety of personnel and equipment. Substation maintenance sites are complex, requiring cables to be frequently bent, dragged, and relocated. They also face risks such as open flames, electric arc burns, and high-temperature overloads, placing extremely high demands on the flame-retardant insulation performance, mechanical resistance, and ease of maintenance of the cables.

[0003] In existing technologies, optimizations for medium-voltage cables used in substation maintenance mainly focus on improving single flame-retardant properties or modifying insulation materials. However, in practical applications, the following prominent shortcomings still exist: First, there is an inherent contradiction between flame retardancy and heat dissipation performance. Conventional flame-retardant sheaths improve flame retardancy by adding flame-retardant fillers, but this leads to a decrease in the cable's thermal conductivity. During maintenance operations, the cable cannot quickly dissipate heat generated by short-term overload, which can easily cause insulation aging or even thermal breakdown. At the same time, existing flame-retardant structures are mostly integral designs. Once a fire occurs in a local area, the flame can easily spread along the cable axis, making it impossible to achieve segmented isolation of the fire and resulting in insufficient reliability of flame-retardant protection. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a high flame-retardant insulated medium-voltage power cable for substation maintenance, which can solve the technical problems of the contradiction between flame retardancy and heat dissipation performance of medium-voltage cables and the inability to achieve segmented fire isolation in the prior art.

[0005] The technical solution adopted by this invention to solve its technical problem is: a high flame-retardant insulated medium-voltage power cable for substation maintenance, comprising... Cable core body; The inner sheath has an insulating shield and a cooling layer installed. The insulating shield is a continuously extruded semi-conductive cross-linked polyethylene layer that completely covers the outside of the cable core without any breaks. The insulating shield has an isolation chamber. The isolation chamber is segmented and can be set at a distance along the cable axis to form multiple independent sealed sections. An elastomer composite material layer is sandwiched between the insulating shield and the cooling layer. The functional layer is equipped with armor, which is a stainless steel strip structure with spiral bidirectional concave and convex anchoring grooves stamped on the surface. The outer protective layer is fitted with an outer sleeve. Pre-cut grooves are provided at corresponding positions of the outer sleeve and armor. The spacing of the pre-cut grooves matches the segment spacing of the isolation chamber. A passive RFID tag is built into each pre-cut groove position on the outer sleeve. The cable core body, inner sheath, functional layer, and outer sheath are arranged coaxially from the inside to the outside.

[0006] Preferably, the isolation chamber is formed by wrapping a semi-conductive nano-synergistic flame-retardant polyimide base tape, which is equipotentially connected to the insulating shielding layer. The surface of the isolation chamber is coated with a fire-expanding carbonization coating. Each independent sealed section has heat-expanding rubber strips at both ends, and each independent sealed section is filled with inert gas.

[0007] Preferably, each independent section of the isolation chamber is independent of the others, and damage to a single section does not affect the airtight and flame-retardant performance of the remaining sections.

[0008] Preferably, the matrix of the elastomer composite material layer is methyl vinyl silicone rubber, and carbon nanotubes and barium titanate nanoparticles are added for composite doping. When the cable is bent or dragged, the elastomer composite material layer can adaptively increase the elastic modulus to disperse the compressive stress of the outer isolation chamber. When local electric field distortion occurs in the cable core body, it can adaptively increase the dielectric constant of the distorted region to uniform electric field and suppress partial discharge.

[0009] Preferably, the inner cavity of the cooling layer is provided with a spiral groove, the interior of the spiral groove is filled with a composite material, and the outer wall of the cooling layer is coated with a fire-expanding flame-retardant coating.

[0010] Preferably, the armor is made of 304 stainless steel strip, with spiral bidirectional concave-convex anchoring grooves stamped on its surface. The inner grooves engage and anchor with the cooling layer, and the outer grooves engage and anchor with the outer sheath, forming a bidirectional mechanical interlock.

[0011] Preferably, the spiral grooves on the armor can evenly distribute stress along the spiral direction when the cable is bent, without stress concentration points.

[0012] Preferably, the cable core body includes three copper conductors, each copper conductor has a main insulation layer on its outer surface, each main insulation layer is attached to a buffer strip, and the buffer strip is fixed to each heat-expanding rubber strip.

[0013] Preferably, the depth of the pre-etched groove is half the thickness of the corresponding layer and does not penetrate the corresponding layer to maintain the layer's airtightness. The passive RFID tag stores cable length information, production information, and insulation status reference data for the corresponding location.

[0014] Preferably, the pre-cut groove enables the cable end to be quickly stripped without special tools, and the stripping process will not scratch the insulation shielding layer.

[0015] The advantages of this invention are: 1. This invention achieves efficient heat dissipation and graded flame retardant protection of the cable simultaneously through the coupling structure design of the isolation chamber and the cooling layer, which solves the inherent contradiction between flame retardant and heat dissipation performance in the prior art. In case of fire, it can achieve segmented sealed oxygen isolation and flame retardant protection, block the axial spread of flames, and greatly improve the reliability of flame retardant protection and the thermal stability of operation of the cable. 2. This invention, through the design of an elastomer composite material layer doped with carbon nanotubes and barium titanate, simultaneously achieves adaptive stress absorption and adaptive homogenization of local electric field distortion during cable bending and dragging, solving the problem of the single function of existing buffer structures, effectively suppressing partial discharge, and significantly improving the insulation life and mechanical tolerance performance of cables under complex working conditions. 3. This invention, through the coaxial pre-grooved groove design that matches the segment spacing of the flame-retardant isolation chamber, and with the built-in passive RFID tag, simultaneously achieves rapid cable stripping without special tools and rapid passive fault location, solving the problems of difficult cable stripping and low fault location efficiency in existing cable maintenance, and greatly improving the work efficiency and operational safety of substation maintenance sites. Attached Figure Description

[0016] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a high flame-retardant insulated medium-voltage power cable for substation maintenance provided in an embodiment of the present invention.

[0018] Figure 2 This is an exploded view of the overall structure of a high flame-retardant insulated medium-voltage power cable for substation maintenance provided in an embodiment of the present invention.

[0019] Figure 3 This is a cross-sectional schematic diagram of the insulation shielding layer structure of a high flame-retardant insulated medium-voltage power cable for substation maintenance provided in an embodiment of the present invention.

[0020] Figure 4 This is a cross-sectional schematic diagram of the cooling layer structure of a high flame-retardant insulated medium-voltage power cable for substation maintenance provided in an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the armor structure of a high flame-retardant insulated medium-voltage power cable for substation maintenance provided in an embodiment of the present invention.

[0022] Figure 6This is a schematic diagram of the outer sheath structure of a high flame-retardant insulated medium-voltage power cable for substation maintenance provided in an embodiment of the present invention.

[0023] Figure 7 This is an exploded schematic diagram of the core structure of a high flame-retardant insulated medium-voltage power cable for substation maintenance, provided by an embodiment of the present invention.

[0024] Figure 8 This invention provides a high flame-retardant insulated medium-voltage power cable for substation maintenance. Figure 7 Enlarged schematic diagram of the structure at point A in the middle.

[0025] Explanation of reference numerals in the attached diagram: 100, cable core body; 110, copper conductor; 111, main insulation layer; 112, buffer strip; 200, inner sheath; 210, insulation shielding layer; 211, isolation chamber; 212, heat-expanding rubber strip; 213, elastomer composite material layer; 220, cooling layer; 221, fire-expanding flame-retardant coating; 222, spiral groove; 300, functional layer; 310, armor; 400, outer sheath; 410, outer sleeve; 411, passive RFID tag. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts disclosed in this invention.

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention.

[0029] Reference manual attached Figures 1 to 8 The present invention provides a structure for a high flame-retardant insulated medium-voltage power cable for substation maintenance, comprising: a cable core body 100; The inner sheath 200 is provided with an insulating shielding layer 210 and a cooling layer 220. The insulating shielding layer 210 is a continuously extruded semi-conductive cross-linked polyethylene layer that completely covers the outside of the cable core body 100 without any breaks. The insulating shielding layer 210 is provided with an isolation chamber 211. The isolation chamber 211 is segmented and can be set at a certain distance along the cable axis to form multiple independent sealed sections. An elastomeric composite material layer 213 is sandwiched between the insulating shielding layer 210 and the cooling layer 220. Functional layer 300, which is equipped with armor 310, wherein the armor 310 is a stainless steel strip structure with spiral bidirectional concave and convex anchoring grooves stamped on the surface. The outer protective layer 400 is fitted with an outer sheath 410. Pre-cut grooves are provided at corresponding positions of the outer sheath 410 and the armor 310. The spacing of the pre-cut grooves matches the segment spacing of the isolation chamber 211. A passive RFID tag 411 is built into each pre-cut groove position on the outer sheath 410. The cable core body 100, inner sheath 200, functional layer 300, and outer sheath 400 are arranged coaxially from the inside to the outside.

[0030] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: Through the four-layer coaxial design of the cable core body 100, inner sheath 200, functional layer 300, and outer sheath 400, the cable achieves functions such as high-reliability power transmission, high-grade flame-retardant insulation, adaptive mechanical and electrical dual protection, efficient armor anchoring 310, and suitability for all-scenario maintenance and repair. It adapts to the core working conditions of frequent bending and dragging, strong electromagnetic interference, high flame-retardant protection requirements, and efficient emergency maintenance operations in substation maintenance sites. Through the elastomeric composite material layer 213 between the insulation shielding layer 210 and the isolation chamber 211, dual adaptive mechanical and electrical protection is simultaneously achieved. The cooling layer 220 achieves synergistic optimization of heat dissipation and flame retardancy, resolving the inherent performance contradiction between the two. The outer sheath structure with pre-cut grooves and passive RFID tags 411 achieves a comprehensive improvement in maintenance convenience. The armor 310 achieves a comprehensive upgrade in cable structural stability.

[0031] In one possible implementation, the isolation chamber 211 is formed by wrapping a semi-conductive nano-synergistic flame-retardant polyimide base tape and is equipotentially connected to the insulating shielding layer 210. The surface of the isolation chamber 211 is coated with a fire-expanding carbonization coating. Each independent sealed section has heat-expanding rubber strips 212 at both ends, and the interior of each independent sealed section is filled with inert gas.

[0032] In this embodiment of the invention, a nano-synergistic flame-retardant polyimide base tape is wrapped around the cable axis to form the main body of the chamber, ensuring the basic sealing and structural strength of the chamber. The isolation chamber 211 is set as multiple independent sealed sections along the cable axis at a preset interval. The heat-expanding rubber strip 212 adopts a graphite-based heat-expanding sealing material. Through the chamber matrix design of the semi-conductive nano-synergistic flame-retardant polyimide base tape, the chamber is made resistant to high temperature, arc, and insulation protection. Combined with the fire-expanding carbonization coating on the surface, a dense heat-insulating carbon layer can be quickly formed when exposed to open flame, blocking the transfer of heat and flame. The design of the heat-expanding rubber strip 212 and the inert gas in the chamber is such that it interferes with the main insulation layer 111 when heated, preventing gaps from appearing between the heat-expanding rubber strip 212 and the main insulation layer 111 at high temperature, thus breaking the seal. The inert gas achieves fire suffocation and flame retardancy, fundamentally blocking the spread path of the flame along the cable axis.

[0033] In one possible implementation, the independent sections of the isolation chamber 211 are independent of each other, and damage to a single section does not affect the airtight and flame-retardant performance of the remaining sections.

[0034] In this embodiment of the invention, through the completely isolated design of each independent sealed compartment, even if the cable is partially damaged by external force or arc burning, resulting in damage to a single compartment, only the protective performance of that single compartment will be affected, while the remaining compartments can still maintain complete sealed flame-retardant capabilities.

[0035] In one possible implementation, the matrix of the elastomer composite material layer 213 is methyl vinyl silicone rubber, and carbon nanotubes and barium titanate nanoparticles are added for composite doping. When the cable is bent or dragged, the elastomer composite material layer 213 can adaptively increase the elastic modulus to disperse the compressive stress of the outer isolation chamber 211. When local electric field distortion occurs in the cable core body 100, it can adaptively increase the dielectric constant of the distorted region to uniform electric field and suppress partial discharge.

[0036] In this embodiment of the invention, methyl vinyl silicone rubber is used as the matrix to ensure the excellent high elasticity and high and low temperature resistance of the composite material, which is suitable for the working conditions of frequent bending and dragging of substation maintenance cables. By adding carbon nanotubes and barium titanate nanoparticles for composite doping, the material is endowed with dual adaptive characteristics without affecting the overall insulation performance of the cable. At the mechanical level, the elastic modulus can be adaptively adjusted according to the stress magnitude, uniformly dispersing the extrusion stress, avoiding stress microcracks in the main insulation layer 111, and extending the mechanical service life of the cable. At the electrical level, the dielectric constant can be adaptively increased according to the local electric field distortion, quickly and uniformly dispersing the distorted electric field, effectively suppressing the generation and development of partial discharge, and improving the insulation protection reliability of the cable.

[0037] In one possible implementation, the inner cavity of the cooling layer 220 is provided with a spiral groove 222, the interior of the spiral groove 222 is filled with a composite material, and the outer wall of the cooling layer 220 is coated with a fire-expanding flame-retardant coating 221.

[0038] In this embodiment of the invention, the heat exchange area of ​​the cable is increased through the structural design of the inner spiral groove 222. Combined with the shape-fixed phase change composite material with phase change temperature, the heat of the cable core body 100 can be quickly absorbed through solid and liquid phase change when the cable is running normally or overheating for a short time. This controls the cable operating temperature within a safe range, reduces the overall thermal resistance of the cable, increases the current carrying capacity, and delays the thermal aging of the main insulation layer 111. Through the design of the flame-retardant coating 221 that expands when exposed to fire on the outer wall, the heat dissipation channel is quickly converted into a flame-retardant isolation barrier, forming a dual flame-retardant synergistic system with the inner isolation chamber 211, thus achieving bidirectional coupling enhancement of heat dissipation and flame-retardant performance.

[0039] In one possible implementation, the armor 310 is made of 304 stainless steel strip, with spiral bidirectional concave-convex anchoring grooves stamped on its surface. The inner grooves engage and anchor with the cooling layer 220, and the outer grooves engage and anchor with the outer sheath 410, forming a bidirectional mechanical interlock.

[0040] In this embodiment of the invention, armor 310 is made of 304 stainless steel strip, which avoids the eddy current heat loss generated by conventional magnetic steel strip in the operation of medium voltage AC cable, and improves the thermal stability of cable operation. Through the spiral bidirectional concave-convex anchoring grooves stamped on the surface, armor 310 forms a bidirectional mechanical interlock with inner cooling layer 220 and outer outer sheath 410, which improves the interlayer peeling force and solves the problems of interlayer slippage, delamination and damage that occur in the cable during frequent bending and dragging.

[0041] In one possible implementation, the spiral grooves on the armor 310 can uniformly distribute stress along the spiral direction when the cable is bent, without stress concentration points.

[0042] In this embodiment of the invention, the spiral toothed groove structure design can evenly distribute the bending stress along the spiral direction to the entire armor 310 when the cable is bent. The stress concentration when bending conventional smooth steel strip is prevented by the spiral toothed groove from causing fatigue fracture of the armor 310 due to repeated bending.

[0043] In one possible implementation, the cable core body 100 includes three copper conductors 110, each copper conductor 110 having a main insulation layer 111 on its outer surface, each main insulation layer 111 being attached to a buffer strip 112, the buffer strip 112 being fixed to each heat-expanding rubber strip 212.

[0044] In this embodiment of the invention, the design of the buffer strip 112 not only achieves buffer isolation between the three-phase compacted copper conductors 110, avoiding squeezing and collision between conductors during laying and bending, and protecting the structural integrity of the main insulation layer 111, but also forms a stable positioning support for the heat-expanding adhesive strip 212, ensuring that the adhesive strip can expand and close accurately and completely when heated, ensuring the sealing effect of the isolation chamber 211, and improving the triggering reliability of the flame-retardant protective structure.

[0045] In one possible implementation, the depth of the pre-etched groove is half the thickness of the corresponding layer and does not penetrate the corresponding layer to maintain the layer's airtightness. The passive RFID tag 411 stores cable length information, production information, and insulation status reference data for the corresponding location.

[0046] In this embodiment of the invention, the semi-deep pre-groove design not only ensures the sealing and structural integrity of each layer during normal cable operation, preventing moisture and external impurities from entering the cable and affecting operational safety, but also provides precise positioning guidance for cable maintenance and stripping. Through the passive RFID tag 411 with built-in storage of full-dimensional information, there is no need for dedicated cable fault detection equipment or a complete power outage. The cable fault breakpoint can be quickly located using only a handheld reader, shortening the time for fault diagnosis and emergency repair.

[0047] In one possible implementation, the pre-cut groove enables the cable end to be quickly stripped without special tools, and the stripping process will not scratch the insulation shielding layer 210.

[0048] In this embodiment of the invention, pre-cut grooves coaxially arranged at corresponding positions of the outer sheath 410 and armor 310 form a layer-matched stripping guide path. Without the need for special cable stripping tools, the layer-by-layer stripping of each structure at the cable end can be completed quickly, significantly shortening the operation time for cable end processing and improving the work efficiency at the substation maintenance site. At the same time, the stripping path is precise and controllable, completely avoiding the problem of scratching the insulation shielding layer 210 and the main insulation layer 111 during the stripping process, ensuring the insulation performance and subsequent operational safety of the cable after stripping, and reducing the operational difficulty and technical threshold of on-site operations.

[0049] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A high flame-retardant insulated medium-voltage power cable for substation maintenance, characterized in that, include: Cable core body; The inner sheath has an insulating shield and a cooling layer installed. The insulating shield is a continuously extruded semi-conductive cross-linked polyethylene layer that completely covers the outside of the cable core without any breaks. The insulating shield has an isolation chamber. The isolation chamber is segmented and can be set at a distance along the cable axis to form multiple independent sealed sections. An elastomer composite material layer is sandwiched between the insulating shield and the cooling layer. The functional layer is equipped with armor, which is a stainless steel strip structure with spiral bidirectional concave and convex anchoring grooves stamped on the surface. The outer protective layer is fitted with an outer sleeve. Pre-cut grooves are provided at corresponding positions of the outer sleeve and armor. The spacing of the pre-cut grooves matches the segment spacing of the isolation chamber. A passive RFID tag is built into each pre-cut groove position on the outer sleeve. The cable core body, inner sheath, functional layer, and outer sheath are arranged coaxially from the inside to the outside.

2. The high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 1, characterized in that: The isolation chamber is formed by wrapping a semi-conductive nano-synergistic flame-retardant polyimide base tape, which is equipotentially connected to the insulating shielding layer. The surface of the isolation chamber is coated with a fire-expanding carbonization coating. Each independent sealed section has heat-expanding rubber strips at both ends, and the interior of each independent sealed section is filled with inert gas.

3. A high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 2, characterized in that: Each independent section of the isolation chamber is independent of the others, and damage to a single section does not affect the airtight and flame-retardant performance of the remaining sections.

4. A high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 1, characterized in that: The matrix of the elastomer composite material layer is methyl vinyl silicone rubber, with carbon nanotubes and barium titanate nanoparticles added as composite doping. When the cable is bent or dragged, the elastomer composite material layer can adaptively increase the elastic modulus to disperse the compressive stress of the outer isolation chamber. When local electric field distortion occurs in the cable core body, it can adaptively increase the dielectric constant of the distorted region to uniform electric field and suppress partial discharge.

5. A high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 1, characterized in that: The cooling layer has a spiral groove in its inner cavity, and the interior of the spiral groove is filled with a composite material. The outer wall of the cooling layer is coated with a flame-retardant coating that expands when exposed to fire.

6. A high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 1, characterized in that: The armor is made of 304 stainless steel strip, with spiral bidirectional concave-convex anchoring grooves stamped on its surface. The inner grooves engage with the cooling layer for anchoring, and the outer grooves engage with the outer sheath for anchoring, forming a bidirectional mechanical interlock.

7. A high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 6, characterized in that: The spiral grooves on the armor can evenly distribute stress along the spiral direction when the cable is bent, eliminating stress concentration points.

8. A high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 1, characterized in that: The cable core body includes three copper conductors, each copper conductor has a main insulation layer on its outer surface, each main insulation layer is attached to a buffer strip, and the buffer strip is fixed to each heat-expanding rubber strip.

9. A high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 1, characterized in that: The depth of the pre-etched groove is half the thickness of the corresponding layer and does not penetrate the corresponding layer to maintain the layer's airtightness. The passive RFID tag stores cable length information, production information, and insulation status reference data for the corresponding location.

10. A high flame-retardant insulated medium-voltage power cable for substation maintenance according to claim 9, characterized in that: The pre-cut grooves enable rapid stripping of cable ends without the need for special tools, and the stripping process will not damage the insulation shielding layer.

Images