Cable joint

Abstract

The utility model relates to the technical field of power cable provides a cable joint, include: two cable bodies that connect each other, and the connecting end of two cable bodies is provided with the conductive core that stretches out setting, electric stress control layer includes first layer and second layer, first layer and second layer all are by electric stress control band reciprocatingly wrapped along the axial direction of cable body and are formed, and the extension length of first layer along the axial direction of cable body is greater than the extension length of second layer along the axial direction of cable body, the utility model discloses by the double -layer composite structure that electric stress control band reciprocatingly wrapped along the axial direction is used as electric stress control layer, utilizes reciprocatingly wrapped process effectively eliminated the interlayer air gap and interface defect that traditional one -way wrapping easily produces, has restrained the partial discharge risk that the inside cavity caused, through the gradient structure design of the difference axial length of inside and outside two layers, has constructed the electric field distribution profile of smooth transition at the fracture, has realized the step -by -step slow -release and uniform control of electric stress.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and in particular to a cable connector. Background Technology

[0002] In power cable systems, cable joints are the weakest link in the overall structure, and their operational stability directly determines the safety, reliability, and service life of the cable line. Currently, medium and low voltage cable joints are mainly classified into four types: wrapped joints, cold-shrink joints, heat-shrink joints, and fusion splicing joints. Compared to other joint types, wrapped joints offer significant advantages such as flexible installation, strong adaptability, and excellent waterproof performance. They can adapt to complex and special working conditions such as long-term immersion in water, irregularly shaped connections, and confined installation spaces. Furthermore, they can efficiently complete emergency line repairs, making them extremely valuable in engineering applications.

[0003] Traditional wrapped cable joints generally employ parametric stress control technology. This involves retaining the original reactive force cone of the cable and combining it with a stress control tape material with a high dielectric constant to optimize the electric field distribution at the cable break, thereby achieving insulation protection. However, existing wrapped cable joint technologies still suffer from poor electric field control stability, poor interlayer adhesion of the tape, and the potential for internal cavities, which can easily lead to partial discharge breakdown. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention proposes a cable connector that can effectively suppress partial discharge and significantly improve the electric field stability and long-term operational reliability of the cable connector.

[0005] This utility model provides a cable connector, comprising: Two interconnected cable sections, with conductive cores extending from the connecting ends of the two cable sections. An electrical stress control layer covers at least a portion of the connection end of the two sections of the cable body; The electrical stress control layer includes a first layer and a second layer that covers at least a portion of the first layer; Both the first layer and the second layer are formed by reciprocating wrapping of an electrically stressed control strip along the axial direction of the cable body, and the extension length of the first layer along the axial direction of the cable body is greater than the extension length of the second layer along the axial direction of the cable body.

[0006] According to the cable connector provided by this utility model, it further includes: A waterproof layer covers the outer periphery of the connection end of the cable body.

[0007] According to the cable connector provided by this utility model, it further includes: A heat shrink tubing is fitted around the outer periphery of the waterproof layer, and the two open ends of the heat shrink tubing extend to the outer peripheral surfaces of the outer sheaths of the two sections of the cable body, respectively, and are sealed and fitted to the outer peripheral surfaces of the outer sheaths.

[0008] According to the cable connector provided by this utility model, it further includes: A waterproof adhesive layer is applied to the contact surface between the heat shrink tubing and the outer sheath.

[0009] According to the present invention, a cable connector is provided, wherein the connecting end of the cable body includes: A first semiconductive layer covers at least a portion of the conductive core; An insulating layer that covers at least a portion of the first semiconductive layer; A second semiconductive layer covers at least a portion of the insulating layer; The electrical stress control layer is disposed at the junction of the second semiconductive layer and the insulating layer.

[0010] According to the cable connector provided by this utility model, it further includes: A metallic shielding layer, covering at least a portion of the second semiconducting layer; A metal mesh sleeve is fitted onto the outer peripheral surface of the conductive core, the first semiconductive layer, the insulating layer, the second semiconductive layer, and the electrical stress control layer. The two ends of the metal mesh sleeve are fixed to the metal shielding layer.

[0011] According to the cable connector provided by this utility model, it further includes: An elastic element is disposed on the metal shielding layer and presses the end of the metal mesh sleeve onto the metal shielding layer.

[0012] According to the cable connector provided by this utility model, the connecting end of the cable body further includes: A connecting tube, the two ends of which are respectively connected to the protruding ends of the two conductive cores.

[0013] According to the present invention, a cable connector is provided in which the outer periphery of the connecting pipe is covered with the first semiconductive layer.

[0014] According to the present invention, the first layer extends 95mm to 105mm along the axial direction of the cable body; the second layer extends 40mm to 50mm along the axial direction of the cable body.

[0015] The above-mentioned one or more technical solutions in the embodiments of this utility model have at least one of the following technical effects: This utility model uses a double-layer composite structure formed by reciprocating wrapping of an electric stress control strip along the axial direction as the electric stress control layer, and makes the axial extension length of the first layer greater than that of the second layer. On the one hand, the reciprocating wrapping process effectively eliminates the interlayer air gaps and interface defects that are easily generated by traditional unidirectional wrapping, significantly improving the bonding density between the strip layers and the electrical continuity of the insulation interface, thereby suppressing the risk of partial discharge caused by internal cavities. On the other hand, through the gradient structure design of the inner and outer layers with different axial lengths, a smooth transition electric field distribution profile is constructed at the break, avoiding the electric field concentration effect at the edge of a single equal-length multilayer structure, realizing the gradual release and uniform control of electric stress, and thus greatly improving the electric field stability and long-term operational reliability of the cable joint under complex working conditions.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model and are not considered as limitations on this application. Moreover, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the cable connector provided by this utility model.

[0019] Figure 2 This is a schematic diagram of the electrical stress control layer provided by this utility model.

[0020] Figure 3 This is a schematic diagram illustrating the installation of the waterproof layer and heat shrink tubing provided by this utility model.

[0021] Figure label: 1. Cable body; 2. Conductive core; 3. Electrical stress control layer; 31. First layer; 32. Second layer; 4. Waterproof layer; 5. Heat shrink tubing; 6. Waterproof adhesive layer; 7. First semiconductive layer; 8. Insulating layer; 9. Second semiconductive layer; 10. Metal shielding layer; 11. Metal mesh sleeve; 12. Elastic element; 13. Connecting tube. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, B1 and / or B2 can represent: B1 existing alone, B1 and B2 existing simultaneously, and B2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The following is combined with Figures 1 to 3 This invention describes a cable connector according to an embodiment of the present invention.

[0027] like Figure 1 and Figure 2As shown, this utility model embodiment provides a cable connector, including: two interconnected cable body segments 1, each with a conductive core 2 extending from its connecting end; an electrical stress control layer 3 covering at least a portion of the connecting end of the cable body 1; the connecting end of the cable body 1 includes: a first semiconductive layer 7 covering at least a portion of the conductive core 2; an insulation layer 8 covering at least a portion of the first semiconductive layer 7; and a second semiconductive layer 9 covering at least a portion of the insulation layer 8. In a specific embodiment, the electrical stress control layer 3 is disposed at the junction of the second semiconductive layer 9 and the insulation layer 8; the electrical stress control layer 3 includes a first layer 31 and a second layer 32 covering at least a portion of the first layer 31; wherein both the first layer 31 and the second layer 32 are formed by reciprocating electrical stress control strips along the axial direction of the cable body 1; the extension length of the first layer 31 along the axial direction of the cable body 1 is greater than the extension length of the second layer 32 along the axial direction of the cable body 1.

[0028] It should be understood that, in this embodiment, by using a double-layer composite structure formed by reciprocating wrapping of an electrical stress control strip along the axial direction as the electrical stress control layer 3, and making the axial extension length of the first layer 31 greater than that of the second layer 32, on the one hand, the reciprocating wrapping process effectively eliminates the interlayer air gaps and interface defects that are easily generated by traditional unidirectional wrapping, significantly improving the bonding density between the strip layers and the electrical continuity of the insulation interface, thereby suppressing the risk of partial discharge caused by internal cavities; on the other hand, through the gradient structure design of the inner and outer layers with different axial lengths, a smooth transition electric field distribution profile is constructed at the break, avoiding the electric field concentration effect at the edge of a single equal-length multilayer structure, realizing the gradual release and uniform control of electrical stress, thereby greatly improving the electric field stability and long-term operational reliability of the cable joint under complex working conditions.

[0029] It should be noted that the connection ends of both cable body sections 1 are stripped to expose the internal conductive core 2, providing a basis for subsequent electrical connection and insulation restoration. Outside the conductive core 2 of each cable body section 1, a first semiconducting layer 7, an insulating layer 8, and a second semiconducting layer 9 are coaxially arranged from the inside out. The first semiconducting layer 7 covers at least a portion of the conductive core 2, eliminating electric field concentration on the conductor surface and achieving a smooth transition between the conductor and the main insulation. The insulating layer 8 covers at least a portion of the first semiconducting layer 7, serving as the main insulation barrier for the cable joint, and withstanding system operating voltage and overvoltage. The second semiconducting layer 9 covers at least a portion of the insulating layer 8, uniformly distributing the potential on the outer surface of the insulating layer 8 and providing an equipotential interface for subsequent grounding or shielding connections.

[0030] Understandably, the electrical stress control layer 3 is the core functional structure for improving the electric field distribution in the cable break area. Specifically, both the first layer 31 and the second layer 32 of the electrical stress control layer 3 are made of electrical stress control tape with high dielectric constant or nonlinear resistance characteristics, formed by reciprocating wrapping along the axial direction of the cable body 1. Compared with the traditional unidirectional spiral wrapping process, reciprocating wrapping can effectively eliminate air gaps and interface slip defects caused by uneven tension or poor overlap between tape layers, significantly improving the interlayer bonding density and electrical continuity, thereby suppressing the risk of partial discharge caused by internal cavities and ensuring the structural integrity and functional stability of the electrical stress control layer 3 during long-term operation.

[0031] Furthermore, the first layer 31 extends along the axial direction of the cable body 1 longer than the second layer 32, causing both ends of the first layer 31 to extend beyond the corresponding ends of the second layer 32. This creates a stepped thickness gradient zone at the axial edge of the electrical stress control layer 3, where the structure transitions naturally from a double-layer to a single-layer structure. This gradient structure design avoids electric field distortion and stress concentration at the edges caused by abrupt changes in insulation thickness when multiple layers are wound at equal lengths. It allows the electric field in the fracture area to be gradually released and smoothly distributed, effectively improving the partial discharge initiation voltage and withstand level of the joint.

[0032] like Figure 2 As shown, according to an embodiment of the present invention, a cable connector has a first layer 31 extending 95mm to 105mm along the axial direction of the cable body 1, and a second layer 32 extending 40mm to 50mm along the axial direction of the cable body 1.

[0033] In a preferred embodiment of this invention, the extension length of the first layer 31 along the axial direction of the cable body 1 is preferably set to 100 mm, and the extension length of the second layer 32 along the axial direction of the cable body 1 is preferably set to 45 mm. This size combination is optimized based on multiple sets of electric field simulation calculations. To verify the actual electrical performance of this preferred size, a power frequency withstand voltage test was conducted on cable joint samples made using the above parameters. The test results show that under the harsh test conditions of applying a voltage twice the rated phase voltage (6U0) for 5 minutes, no breakdown or flashover occurred in the joint samples, and there was no significant increase in partial discharge before and after the test. This withstand voltage level is far higher than the 4.5 times rated phase voltage (4.5U0) withstand requirement for medium-voltage cable joints specified in current national and industry standards, fully demonstrating that the length combination of the first layer 31 and the second layer 32 not only has excellent electric field control capability in theory, but also provides sufficient safety margin and long-term operational reliability in practical engineering applications.

[0034] It should be noted that, in the actual manufacturing and assembly process, the specific length values ​​of the first layer 31 and the second layer 32 can be finely adjusted according to the outer diameter of the cable insulation, the cross-sectional area of ​​the conductor, and the nonlinear coefficient of the electrical stress control strip.

[0035] like Figure 1 As shown, a cable connector provided according to an embodiment of the present utility model further includes: a metal shielding layer 10 covering at least a portion of the second semiconductive layer 9; and a metal mesh sleeve 11 sleeved on the outer peripheral surface of the conductive core 2, the first semiconductive layer 7, the insulating layer 8, the second semiconductive layer 9, and the electrical stress control layer 3, with both ends of the metal mesh sleeve 11 fixed to the metal shielding layer 10.

[0036] It should be understood that the metal shielding layer 10 covers at least a portion of the outer periphery of the second semiconductive layer 9. Its material is typically a copper strip or copper wire braid, used to forcibly clamp the surface potential of the second semiconductive layer 9 to ground potential and provide a low-impedance return path for fault current or induced current, while preventing external electromagnetic interference from intruding into the internal insulation structure of the joint. The metal mesh sleeve 11 is typically made of high-conductivity copper wire or tin-plated copper wire, possessing excellent flexibility and tensile strength. On one hand, the metal mesh sleeve 11, as an extension and supplement to the metal shielding layer 10, ensures the continuity of shielding throughout the entire joint area, maintaining an equipotential grounded state on the outer surface of the joint body along its entire length, effectively suppressing surface discharge and electric field leakage. On the other hand, the metal mesh sleeve 11 provides uniform radial constraint force to the joint body, enhancing the interfacial pressure between functional layers, reducing the risk of interlayer separation caused by thermal expansion and contraction or mechanical vibration, while improving the overall bending and impact resistance of the joint, ensuring its structural integrity and electrical safety under laying, operation, and short-circuit conditions.

[0037] like Figure 1 As shown, a cable connector provided according to an embodiment of the present invention further includes: an elastic element 12 disposed on the metal shielding layer 10, which presses the end of the metal mesh sleeve 11 onto the metal shielding layer 10.

[0038] In some possible implementations, the elastic element 12 can take the form of a constant force spring, stainless steel clamp, or corrugated spring sheet. Its core function is to provide a continuous and stable radial clamping force to ensure that the end of the metal mesh sleeve 11 and the metal shielding layer 10 always remain tightly fitted. Compared with traditional welding or crimping methods, the connection of the elastic element 12 does not require high-temperature operation, avoiding the adverse effects of heat damage on the interface performance of the semiconductive layer and the insulation layer 8. At the same time, it can adapt to the thermal expansion and contraction deformation caused by load changes during cable operation, preventing poor contact or shielding interruption at the connection point due to stress relaxation.

[0039] like Figure 1 and Figure 3As shown, a cable connector provided according to an embodiment of the present invention further includes: a waterproof layer 4, which covers the outer periphery of the connecting end of the cable body 1.

[0040] It should be understood that the waterproof layer 4, as the core barrier of the joint sealing and protection system, mainly functions to block moisture, humidity and corrosive media from penetrating the internal insulation and shielding structure along the axial or radial direction of the joint, and to prevent the deterioration of the semiconductive layer interface, corrosion of metal parts or aggravation of partial discharge caused by water vapor penetration, thereby ensuring the long-term electrical stability and mechanical integrity of the joint in humid, water-immersed or high-humidity environments.

[0041] In some possible implementations, the waterproof layer 4 is typically made of materials with excellent hydrophobicity and interfacial adhesion, such as self-adhesive rubber insulating tape, hot melt adhesive composite tape, or cold-shrink elastomer sleeve. During construction, it is required to continuously wrap the layer in a semi-overlapping manner or to form a complete shrink-fit, ensuring that the coverage extends at least 30mm beyond both ends of the joint body and achieves a seamless transition with the original outer sheath of the cable body 1. Appropriate tension should be applied during the wrapping process to eliminate interlayer air, ensuring a tight fit between the waterproof layer 4 and the surfaces of each functional layer, preventing the formation of capillary seepage channels due to gaps. For direct burial or underwater installation scenarios, water-blocking yarn or water-absorbing expansion tape can be added to the outside of the waterproof layer 4 as an auxiliary defense line to further enhance longitudinal water-blocking capability.

[0042] like Figure 1 and Figure 3 As shown, a cable connector provided according to an embodiment of the present utility model further includes: a heat shrink tube 5, which is sleeved on the outer periphery of the waterproof layer 4, and the two open ends of the heat shrink tube 5 extend to the outer peripheral surface of the outer sheath of the two cable bodies 1 respectively, and are sealed and fitted to the outer peripheral surface of the outer sheath.

[0043] It should be understood that the two ends of the heat shrink tubing 5 form a tight and continuous sealed fit with the outer sheath surface through heat shrinking. As the final barrier of the external protection system of the joint, the heat shrink tubing 5 not only provides mechanical protection for the inner waterproof layer 4, preventing it from being scratched, squeezed or damaged by ultraviolet aging during laying, backfilling or operation, but also builds a complete radial and longitudinal moisture-proof sealing system through the overlap and sealing with the cable outer sheath, effectively blocking the path of moisture to seep in along the interface of the joint ends.

[0044] In some possible implementations, the heat shrink tubing 5 is typically made of materials with excellent weather resistance, chemical corrosion resistance, and high shrinkage rate, such as radiation-crosslinked polyolefin or fluororubber, with a pre-coated hot-melt sealant layer on the inner wall. During installation, the heat shrink tubing 5 should be centered and cover the joint body; during the heating and shrinking process, it should be pushed evenly from the center to both ends to ensure that the hot-melt adhesive fully melts and fills the microscopic gaps between the heat shrink tubing 5 and the outer sheath, forming a bubble-free and wrinkle-free adhesive seal. After shrinkage, the outer diameter of the heat shrink tubing 5 should smoothly transition with the cable outer sheath, avoiding steps or depressions to reduce the risk of electric field distortion and water accumulation.

[0045] like Figure 1 As shown, a cable connector provided according to an embodiment of the present invention further includes: a waterproof adhesive layer 6, disposed on the contact surface between the heat shrink tubing 5 and the outer sheath.

[0046] In some possible implementations, the waterproof adhesive layer 6 preferably uses waterproof putty as a filling and sealing material. Waterproof putty is a butyl rubber or polyisobutylene-based composite material with high plasticity, self-adhesion and excellent water-repellent properties. Its core function is to pre-fill the micro-unevenness, scratches and irregular gaps on the surface of the cable outer sheath before the heat shrink tubing 5 shrinks, eliminating the bonding blind spots that may exist if hot melt adhesive is used alone.

[0047] It should be noted that the waterproof sealant possesses excellent plasticity and adhesion at room temperature. During application, it can be manually kneaded into strips or sheets and tightly adhered to the overlapping area of ​​the outer sheath. When the heat shrink tubing 5 shrinks due to heat, the radial pressure causes the waterproof sealant to flow further and embed into the interface gaps, forming a dense, air-gap-free, and channel-free water-blocking barrier. Simultaneously, the chemical inertness and hydrolysis resistance of the waterproof sealant ensure its long-term stability in humid, acidic / alkaline soils, or salt spray environments, preventing hardening, cracking, or loss of adhesion due to erosion. Actual testing shows that it can withstand a 5m water depth at the intermediate joint without water ingress, far exceeding the tender requirements, ensuring the long-term normal operation of the product.

[0048] like Figure 1 As shown, a cable connector provided according to an embodiment of the present utility model further includes: the connecting end of the cable body 1 further includes: a connecting pipe 13, the two ends of which are respectively connected to the protruding ends of two conductive cores 2.

[0049] It should be understood that the connecting pipe 13 not only bears the current-carrying task during normal operation, but also needs to withstand short-circuit current impacts, thermal cycling stress, and laying traction. Therefore, its material, size, crimping process, and surface treatment directly determine the conductivity reliability, temperature rise performance, and long-term service life of the joint. In some possible embodiments, the connecting pipe 13 is usually made of high-purity electrolytic copper or aluminum alloy, and the inner wall is tin-plated or silver-plated to reduce contact resistance and prevent oxidation.

[0050] like Figure 1As shown, a cable connector provided according to an embodiment of the present invention has a first semiconductive layer 7 covering the outer periphery of the connecting pipe 13.

[0051] It should be understood that the first semiconductive layer 7, which is applied to the outer periphery of the connecting tube 13, is a key component of the cable joint insulation shielding system. Its function is to smooth the electric field distribution on the surface of the connecting tube 13 and eliminate local electric field concentration caused by geometrical abrupt changes in the metal connecting tube 13, thereby preventing partial discharge or insulation breakdown at the interface. From a material and process perspective, the first semiconductive layer 7 is usually applied to the outer surface of the connecting tube 13 by wrapping with a semiconductive tape of the same formulation as the cable body 1, integrally molding with a pre-fabricated rubber stress cone, or extruding a semiconductive elastomer on-site.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be covered within the scope of the claims of the present invention.

Claims

1. A cable connector, characterized in that, include: Two interconnected cable bodies (1), with conductive cores (2) extending from the connecting ends of the two cable bodies (1); An electrical stress control layer (3) covers at least a portion of the connection end of the two sections of the cable body (1); The electrical stress control layer (3) includes a first layer (31) and a second layer (32) covering at least a portion of the first layer (31). The first layer (31) and the second layer (32) are both formed by reciprocating wrapping of the electrical stress control strip along the axial direction of the cable body (1), and the extension length of the first layer (31) along the axial direction of the cable body (1) is greater than the extension length of the second layer (32) along the axial direction of the cable body (1).

2. The cable connector according to claim 1, characterized in that, Also includes: A waterproof layer (4) covers the outer periphery of the connection end of the cable body (1).

3. The cable connector according to claim 2, characterized in that, Also includes: Heat shrink tubing (5) is sleeved on the outer periphery of the waterproof layer (4), and the two open ends of the heat shrink tubing (5) extend to the outer periphery of the outer sheath of the two sections of the cable body (1) and are sealed and fitted to the outer periphery of the outer sheath.

4. The cable connector according to claim 3, characterized in that, Also includes: A waterproof adhesive layer (6) is provided on the contact surface between the heat shrink tube (5) and the outer sheath.

5. The cable connector according to any one of claims 1-4, characterized in that, The connection end of the cable body (1) includes: A first semiconducting layer (7) covers at least a portion of the conductive core (2); Insulating layer (8) covers at least a portion of the first semiconductive layer (7); The second semiconductive layer (9) covers at least a portion of the insulating layer (8); The electrical stress control layer (3) is disposed at the junction of the second semiconductive layer (9) and the insulating layer (8).

6. The cable connector according to claim 5, characterized in that, Also includes: A metal shielding layer (10) covers at least a portion of the second semiconducting layer (9). A metal mesh sleeve (11) is fitted onto the outer periphery of the conductive core (2), the first semiconductive layer (7), the insulating layer (8), the second semiconductive layer (9), and the electrical stress control layer (3); The two ends of the metal mesh sleeve (11) are fixed to the metal shielding layer (10).

7. The cable connector according to claim 6, characterized in that, Also includes: An elastic element (12) is disposed on the metal shielding layer (10) and presses the end of the metal mesh sleeve (11) onto the metal shielding layer (10).

8. The cable connector according to claim 5, characterized in that, The connection end of the cable body (1) also includes: Connecting tube (13), the two ends of which are respectively connected to the protruding ends of the two conductive cores (2).

9. The cable connector according to claim 8, characterized in that, The outer periphery of the connecting tube (13) is covered with the first semiconductive layer (7).

10. The cable connector according to any one of claims 1-4, characterized in that, The first layer (31) extends 95 mm to 105 mm along the axial direction of the cable body (1); the second layer (32) extends 40 mm to 50 mm along the axial direction of the cable body (1).

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