Lengthened first-aid repair joint and method for contact connection type crosslinked polyethylene cable

Abstract

The invention relates to a contact connection type cross-linked polyethylene cable lengthened first-aid repair joint and method, the contact connection type cross-linked polyethylene cable lengthened first-aid repair joint is used for connecting cables at the two ends respectively, the first-aid repair joint comprises a center conductor, an epoxy resin part, a shell assembly, an insulation side connecting assembly and a non-insulation side connecting assembly, and the epoxy resin part wraps the outer side of the center conductor; the central conductor and the central conductor are combined into an epoxy assembly, and the shell assembly is fixed on the outer side of the epoxy assembly; the insulating side connecting assembly and the non-insulating side connecting assembly are connected to the two ends of the epoxy assembly respectively. Each of the insulated side connecting assembly and the non-insulated side connecting assembly comprises a conductor connecting pipe, an interface slot bolt, an internal electrode contact, a brake ring, a stress cone, a compression device and a cable protection structure. Compared with the prior art, the cable fault repair device can solve the problem of cable fault repair at a certain distance, can repair fault cables with different cross sections at the same time, realizes stable guiding and positioning of the cables, and improves the stability of the joint of the cables on the two sides.

Description

Technical Field

[0001] The invention relates to the field of cable emergency repair joints, in particular to an extended emergency repair joint for a contactor-connected cross-linked polyethylene cable and a method. Background Art

[0002] With the continuous development and progress of society, 110kV cable lines are more and more widely used. Line faults may occur during long-term operation. Circuit faults have a great impact, and how to quickly, efficiently and conveniently repair cable faults is the most important thing.

[0003] At present, when a 110kV cable line fails, the faulty cable is generally found and two intermediate joints are used to repair the faulty line. Specifically, after the cable intermediate joint and the cable body fail, the cable redundancy is usually insufficient. The traditional fault repair method is to add a cable intermediate joint at both ends of one cable for repair. This solution takes a long time to repair and the installation process is complicated. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide an extended emergency repair connector and method for cross-linked polyethylene cables with contact sub-connection, which can solve the emergency repair of cable faults at a certain distance, achieve stable guidance and positioning of the cable, and improve the stability of the cable connections on both sides.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A contact-connected extended repair connector for cross-linked polyethylene cables, used to connect cables at both ends, comprising a central conductor, an epoxy resin part, a shell component, an insulating side connection component and a non-insulating side connection component, wherein the epoxy resin part is coated on the outside of the central conductor and combined with the central conductor to form an epoxy assembly, and the shell component is fixed on the outside of the epoxy assembly; the insulating side connection component and the non-insulating side connection component are respectively connected to both ends of the epoxy assembly;

[0007] The insulating side connection assembly and the non-insulating side connection assembly both include a conductor connection tube, an interface slot bolt, an internal electrode contact, a brake ring, a stress cone, a compression device and a cable protection structure. The inner side of the central conductor is a hollow structure. One end of the conductor connection tube is crimped to the end of the cable, and the other end is connected to the internal electrode contact through the interface slot bolt. The conductor connection tube is electrically connected to the inner wall of the central conductor through the internal electrode contact; the brake ring and the stress cone are both used to be installed on the outside of the end of the cable and are located on the inside of the end of the epoxy assembly. The compression device is installed at the end of the epoxy assembly to position the stress cone; the cable protection structure is respectively connected to the end of the epoxy assembly and the cable, and is used to seal and protect the connection between the cable and the epoxy assembly;

[0008] The non-insulated side connection assembly further comprises a connection flange which is fixed to the end of the epoxy assembly.

[0009] Furthermore, the lengths of the epoxy assembly and the conductor connecting tube are adjusted according to the connection length requirements of the two cables.

[0010] Furthermore, a through hole is provided on the inner side of the central conductor, and the conductor connecting tube, interface slot bolt and internal electrode contact are all located in the through hole; one end of the conductor connecting tube is provided with a mounting groove for crimping the wire core at the end of the connecting cable.

[0011] Furthermore, the epoxy resin part and the central conductor are an integrally formed structure.

[0012] Furthermore, the epoxy resin part is a stepped cylindrical structure, and the outer sides of both ends are stepped; the outer shell assembly includes a first protective shell, a second protective shell and a third protective shell, the first protective shell and the third protective shell are respectively located at the two ends of the epoxy resin part and match the shapes of the two ends of the epoxy resin part, the second protective shell is located on the annular outer side of the epoxy resin part, the first protective shell, the second protective shell and the third protective shell are connected in sequence and fixed on the outside of the epoxy assembly; the first protective shell, the second protective shell and the third protective shell are fixed at the connection between each other by bolts and sealing rings.

[0013] Furthermore, the cable protection structure includes a protective fitting and an anti-corrosion layer, one end of the protective fitting is connected to the end of the epoxy assembly, and the other end is shielded outside the end of the cable, and the anti-corrosion layer covers the end of the protective fitting and the end of the exposed area of ​​the cable core.

[0014] The present invention also provides a cable installation method using the above-mentioned contact-connected extended repair connector for cross-linked polyethylene cables, comprising the following steps:

[0015] Obtain an assembly that is pre-assembled by assembling a processed epoxy assembly and a housing assembly, and select an assembly of corresponding length according to the length of the cable line to be repaired;

[0016] Install the insulating side connecting components and the non-insulating side connecting components on the insulating side and the non-insulating side of the assembly respectively, and assemble the cables so that the cables on both sides extend into the through hole of the center conductor until the conductor connecting tubes connecting the cables on both sides abut against each other. At this time, the ends of the cables on both sides are also limited by the through hole of the center conductor.

[0017] Furthermore, the process of installing the cable on the insulation side of the assembly specifically includes the following steps:

[0018] Obtain the cable and insulation side connection components, process the cable ends, and expose the wire core; install the stress cone and brake ring on the outside of the processed cable end, crimp one end of the conductor connecting tube on the outside of the wire core of the cable end, install the internal electrode contact on the other end of the conductor connecting tube, and fix it with the interface groove bolts; insert the cable into the insulation side end of the epoxy assembly; install the compression device on the insulation side end of the epoxy assembly, position the stress cone, and fix the compression device with bolts; install the cable protection structure on the outside of the connection between the cable and the epoxy assembly.

[0019] Furthermore, the process of installing the cable on the non-insulated side of the assembly specifically includes the following steps:

[0020] Obtain the cable and non-insulated side connection components, process the cable ends, and expose the wire cores; install stress cones and brake rings on the outside of the processed cable ends, crimp one end of the conductor connecting tube on the outside of the wire core of the cable end, install an internal electrode contact on the other end of the conductor connecting tube, and fix it with interface groove bolts; insert the cable into the non-insulated side end of the epoxy assembly; install a connecting flange on the non-insulated side end of the epoxy assembly; install a compression device on the non-insulated side end of the epoxy assembly, position the stress cone, and fix the compression device with bolts; install a cable protection structure on the outside of the connection between the cable and the epoxy assembly.

[0021] Furthermore, the cross-sectional sizes of the cables assembled on the insulating side and the non-insulating side of the assembly are the same or different.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) The present invention provides an epoxy assembly formed by combining an epoxy resin part and a central conductor, and a conductor connection tube, an interface slot bolt and an internal electrode contact are arranged in the internal through hole of the central conductor. After the wire core at the end of the cable is crimped with the conductor connection tube, an electrical connection is achieved with the central conductor through the internal electrode contact and the interface slot bolt, thereby achieving current conduction and preventing the product from heating up.

[0024] The length of the epoxy assembly and the conductor connecting tube can be adjusted according to actual conditions to solve the problem of insufficient cable length and have sufficient current-carrying cross-section to meet the requirements of large currents. It can solve the emergency repair of cable faults at a certain distance and realize the transformation from traditional emergency repair with two joints to emergency repair with one joint, which can save emergency repair time and products for emergency repair. At the same time, since the two sides of this emergency repair joint product can correspond to cables with different cross-sections, it can realize the simultaneous repair of faulty cables with different cross-sections, thereby improving the application range of the product.

[0025] (2) The present invention provides a through hole that passes through both ends on the inner side of the center conductor and a conductor connecting tube at the end of the cable. When in use, the cables on both sides are inserted into the through hole of the center conductor until the conductor connecting tubes connecting the cables on both sides abut against each other. This installation method can achieve stable guidance and positioning of the cables and improve the stability of the cable connections on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the use state of an extended emergency repair connector for a cross-linked polyethylene cable of a contactor connection type provided in an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of the factory assembly state of an extended emergency repair connector for a cross-linked polyethylene cable of a contactor connection type provided in an embodiment of the present invention;

[0028] In the figure, 1, center conductor, 2, epoxy assembly, 3, second protective shell, 4, conductor connecting tube, 5, interface slot bolt, 6, internal electrode contact, 7, brake ring, 8, stress cone, 9, epoxy resin part, 10, connecting flange, 11, compression device, 12, protective hardware, 13, anti-corrosion layer, 14, first protective shell, 15, third protective shell, 16, sealing ring, 17, cable. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0033] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] Example 1

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a contact-connected extended repair connector for cross-linked polyethylene cables, which is used to connect cables 17 at both ends, including a center conductor 1, an epoxy resin part 9, a shell component, an insulating side connection component and a non-insulating side connection component. The epoxy resin part 9 is coated on the outside of the center conductor 1 and combined with the center conductor 1 to form an epoxy assembly 2. The shell component is fixed on the outside of the epoxy assembly 2; the insulating side connection component and the non-insulating side connection component are respectively connected to both ends of the epoxy assembly 2;

[0037] The insulating side connection assembly and the non-insulating side connection assembly both include a conductor connection tube 4, an interface groove bolt 5, an internal electrode contact 6, a brake ring 7, a stress cone 8, a compression device 11 and a cable protection structure. The inner side of the central conductor 1 is a hollow structure. One end of the conductor connection tube 4 is crimped to the end of the cable 17, and the other end is connected to the internal electrode contact 6 through the interface groove bolt 5. The conductor connection tube 4 is electrically connected to the inner wall of the central conductor 1 through the internal electrode contact 6; the brake ring 7 and the stress cone 8 are both used to be installed on the outer side of the end of the cable 17 and are located on the inner side of the end of the epoxy assembly 2. The compression device 11 is installed at the end of the epoxy assembly 2 for positioning the stress cone 8; the cable protection structure is respectively connected to the end of the epoxy assembly 2 and the cable 17, and is used to seal and protect the connection between the cable 17 and the epoxy assembly 2;

[0038] The non-insulated side connection assembly further includes a connection flange 10 , which is fixed to the end of the epoxy assembly 2 .

[0039] The lengths of the epoxy assembly 2 and the conductor connecting tube 4 can be adjusted according to the connection length requirements of the two cables 17, which can solve the problem of insufficient cable length and have sufficient current-carrying cross-sections to meet the requirements of large currents.

[0040] like Figure 2 As shown, the inner side of the center conductor 1 is provided with a through hole passing through both ends, and the conductor connecting tube 4, the interface slot bolt 5 and the internal electrode contact 6 are all located in the through hole; one end of the conductor connecting tube 4 is provided with a mounting groove for crimping the wire core at the end of the connecting cable 17.

[0041] Preferably, the epoxy resin part 9 and the central conductor 1 are an integrally formed structure, which improves product stability, reduces on-site installation time, and ensures electrical product performance.

[0042] Preferably, the epoxy resin part 9 is a stepped cylindrical structure, and the outer sides of both ends are stepped; the outer shell assembly includes a first protective shell 14, a second protective shell 3 and a third protective shell 15, the first protective shell 14 and the third protective shell 15 are respectively located at the two ends of the epoxy resin part 9, and are matched with the shapes of the two ends of the epoxy resin part 9, the second protective shell 3 is located on the annular outer side of the epoxy resin part 9, the first protective shell 14, the second protective shell 3 and the third protective shell 15 are connected in sequence and fixed on the outside of the epoxy assembly 2; the first protective shell 14, the second protective shell 3 and the third protective shell 15 are fixed at the two connections by bolts and sealing rings 16.

[0043] The epoxy resin part 9 of the stepped cylindrical structure can facilitate the installation and positioning of the first protective shell 14, the second protective shell 3 and the third protective shell 15, and is convenient for in-factory assembly.

[0044] The cable cross-sections on both sides of the extended repair joint do not interfere with each other, so faulty cables with different cross-sections can be repaired.

[0045] Preferably, the cable protection structure includes a protective fitting 12 and an anti-corrosion layer 13, one end of the protective fitting 12 is connected to the end of the epoxy assembly 2, and the other end is shielded outside the end of the cable 17, and the anti-corrosion layer 13 covers the end of the protective fitting 12 and the end of the exposed area of ​​the battery core of the cable 17.

[0046] Preferably, the conductive area where the epoxy assembly 2 is connected to the cable 17 is coated with conductive paint, that is, the area of ​​the extended emergency repair joint that acts as an insulating tube is the area of ​​the epoxy assembly that is not coated with conductive paint, realizing an integrated design of the insulating and conductive areas, enhancing the electrical connection performance of the product, and reducing the installation process.

[0047] In this embodiment, the stress cone 8 is made of EPDM rubber.

[0048] Example 2

[0049] This embodiment provides a cable installation method using an extended emergency repair connector for a cross-linked polyethylene cable of a contactor connection type as in Embodiment 1, comprising the following steps:

[0050] Obtain an assembly that is pre-assembled by assembling the processed epoxy assembly 2 and the housing assembly, and select an assembly of corresponding length according to the length of the cable 17 to be repaired;

[0051] The insulating side connecting components are installed on the insulating side and the non-insulating side connecting components of the assembly respectively, and the cables 17 are assembled so that the cables 17 on both sides extend into the through holes of the center conductor 1 until the conductor connecting tubes 4 connected to the cables 17 on both sides abut against each other. At this time, the ends of the cables 17 on both sides are also limited by the through holes of the center conductor 1.

[0052] The process of assembling the cable 17 on the insulation side includes the following steps:

[0053] Obtain the cable 17 and the insulation side connection assembly, perform end processing on the cable 17, and expose the wire core; install the stress cone 8 and the brake ring 7 on the outside of the processed end of the cable 17, crimp one end of the conductor connecting tube 4 on the outside of the wire core of the end of the cable 17, install the internal electrode contact 6 on the other end of the conductor connecting tube 4, and fix it with the interface groove bolt 5; insert the cable 17 into the insulation side end of the epoxy assembly 2; install the compression device 11 on the insulation side end of the epoxy assembly 2, position the stress cone 8, and fix the compression device 11 with bolts; install the cable protection structure on the outside of the connection between the cable 17 and the epoxy assembly 2.

[0054] The process of assembling the cable 17 on the non-insulated side includes the following steps:

[0055] Obtain the cable 17 and the non-insulated side connection assembly, process the end of the cable 17, and expose the wire core; install the stress cone 8 and the brake ring 7 on the outside of the processed end of the cable 17, crimp one end of the conductor connecting tube 4 on the outside of the wire core of the end of the cable 17, install the internal electrode contact 6 on the other end of the conductor connecting tube 4, and fix it with the interface groove bolt 5; insert the cable 17 into the non-insulated side end of the epoxy assembly 2; install the connecting flange 10 on the non-insulated side end of the epoxy assembly 2; install the compression device 11 on the non-insulated side end of the epoxy assembly 2, position the stress cone 8, and fix the compression device 11 with bolts; install the cable protection structure on the outside of the connection between the cable 17 and the epoxy assembly 2.

[0056] The cross-sectional dimensions of the cables 17 assembled on the insulated side and the non-insulated side of the assembly are the same or different, that is, the two sides of the product can correspond to cables with different cross-sections, thereby achieving simultaneous repair of faulty cables with different cross-sections and improving the application range of the product.

[0057] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A contact-connected extended repair connector for cross-linked polyethylene cables, used to connect cables (17) at both ends, characterized in that: The invention comprises a central conductor (1), an epoxy resin component (9), a shell component, an insulating side connection component and a non-insulating side connection component, wherein the epoxy resin component (9) is coated on the outside of the central conductor (1) and is combined with the central conductor (1) to form an epoxy assembly (2), and the shell component is fixed on the outside of the epoxy assembly (2); the insulating side connection component and the non-insulating side connection component are respectively connected to both ends of the epoxy assembly (2); The insulating side connection assembly and the non-insulating side connection assembly both comprise a conductor connection tube (4), an interface slot bolt (5), an internal electrode contact (6), a brake ring (7), a stress cone (8), a compression device (11) and a cable protection structure. The inner side of the central conductor (1) is a hollow structure. One end of the conductor connection tube (4) is crimped onto the end of the cable (17), and the other end is connected to the internal electrode contact (6) via the interface slot bolt (5). The conductor connection tube (4) is electrically connected to the inner wall of the central conductor (1) via the internal electrode contact (6). The brake ring (7) and the stress cone (8) are both used to be installed on the outer side of the end of the cable (17) and are located on the inner side of the end of the epoxy assembly (2). The compression device (11) is installed on the end of the epoxy assembly (2) and is used to position the stress cone (8). The cable protection structure is respectively connected to the end of the epoxy assembly (2) and the cable (17) and is used to seal and protect the connection between the cable (17) and the epoxy assembly (2). The non-insulated side connection assembly further comprises a connection flange (10), which is fixed to the end of the epoxy assembly (2).

2. The extended repair connector for cross-linked polyethylene cables of contactor connection type according to claim 1, characterized in that: The lengths of the epoxy assembly (2) and the conductor connection tube (4) are adjusted according to the connection length requirements of the two cables (17).

3. The extended repair connector for cross-linked polyethylene cables of contactor connection type according to claim 1, characterized in that: The inner side of the central conductor (1) is provided with a through hole that passes through both ends, and the conductor connecting tube (4), the interface slot bolt (5) and the internal electrode contact (6) are all located in the through hole; one end of the conductor connecting tube (4) is provided with a mounting groove for crimping the wire core at the end of the connecting cable (17).

4. The extended repair connector for cross-linked polyethylene cables of contactor connection type according to claim 1, characterized in that: The epoxy resin part (9) and the central conductor (1) are an integrally formed structure.

5. The extended repair connector for cross-linked polyethylene cables of contactor connection type according to claim 1, characterized in that: The epoxy resin part (9) is a stepped cylindrical structure, and the outer sides of both ends are stepped; the outer shell assembly comprises a first protective shell (14), a second protective shell (3) and a third protective shell (15); the first protective shell (14) and the third protective shell (15) are respectively located at the two ends of the epoxy resin part (9) and match the shapes of the two ends of the epoxy resin part (9); the second protective shell (3) is located on the annular outer side of the epoxy resin part (9); the first protective shell (14), the second protective shell (3) and the third protective shell (15) are connected in sequence and fixed on the outer side of the epoxy assembly (2); the first protective shell (14), the second protective shell (3) and the third protective shell (15) are fixed at the connection points between each other by bolts and sealing rings (16).

6. The extended repair connector for cross-linked polyethylene cables of contactor connection type according to claim 1, characterized in that: The cable protection structure comprises a protective fitting (12) and an anti-corrosion layer (13); one end of the protective fitting (12) is connected to the end of the epoxy assembly (2), and the other end is shielded outside the end of the cable (17); and the anti-corrosion layer (13) covers the end of the protective fitting (12) and the end of the exposed area of ​​the battery core of the cable (17).

7. A cable installation method using an extended emergency repair joint for a cross-linked polyethylene cable of the contactor connection type as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Obtain an assembly that is pre-assembled by assembling a processed epoxy assembly (2) and a housing assembly, and select an assembly of corresponding length according to the length of the cable (17) to be repaired; An insulating side connection component is installed on the insulating side and the non-insulating side connection component of the assembly respectively, and the cables (17) are assembled so that the cables (17) on both sides extend into the through hole of the central conductor (1) until the conductor connection tubes (4) connected to the cables (17) on both sides abut against each other. At this time, the ends of the cables (17) on both sides are also limited by the through hole of the central conductor (1).

8. The method according to claim 7, characterized in that The process of installing the cable (17) on the insulation side of the assembly specifically comprises the following steps: Obtain a cable (17) and an insulation side connection assembly, perform end processing on the cable (17) and expose the wire core; install a stress cone (8) and a brake ring (7) on the outside of the processed end of the cable (17), crimp one end of a conductor connection tube (4) on the outside of the wire core at the end of the cable (17), install an internal electrode contact (6) on the other end of the conductor connection tube (4), and fix it with an interface groove bolt (5); insert the cable (17) into the insulation side end of the epoxy assembly (2); install a compression device (11) on the insulation side end of the epoxy assembly (2), position the stress cone (8), and fix the compression device (11) with bolts; install a cable protection structure on the outside of the connection between the cable (17) and the epoxy assembly (2).

9. The method according to claim 7, characterized in that: The process of installing the non-insulated side cable (17) of the assembly specifically comprises the following steps: Obtain a cable (17) and a non-insulated side connection assembly, perform end processing on the cable (17) and expose the wire core; install a stress cone (8) and a brake ring (7) on the outside of the processed cable (17) end, crimp one end of a conductor connection tube (4) on the outside of the wire core at the end of the cable (17), install an internal electrode contact (6) on the other end of the conductor connection tube (4), and fix it with an interface slot bolt (5); insert the cable (17) into the non-insulated side end of the epoxy assembly (2); install a connection flange (10) on the non-insulated side end of the epoxy assembly (2); install a compression device (11) on the non-insulated side end of the epoxy assembly (2), position the stress cone (8), and fix the compression device (11) with bolts; install a cable protection structure on the outside of the connection between the cable (17) and the epoxy assembly (2).

10. The method according to claim 7, characterized in that The cross-sectional dimensions of the cables (17) assembled on the insulated side and the non-insulated side of the assembly are the same or different.

Images