Lengthened first-aid repair joint and method for 110kV crosslinked polyethylene cable

Abstract

The invention relates to a lengthened first-aid repair joint and method for a 110kV crosslinked polyethylene cable, the lengthened first-aid repair joint is used for connecting cables at the two ends respectively, the lengthened 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, the epoxy resin part wraps the outer side of the center conductor and is combined with the center conductor to form an epoxy assembly, and the shell assembly is connected with the insulation side connecting assembly. 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 insulating side connecting assembly and the non-insulating side connecting assembly comprises a connector, a connecting contact, a brake ring, a stress cone, a compression device and a cable protection structure. Compared with the prior art, cable fault emergency repair within a certain distance can be solved, and traditional two-joint emergency repair is changed into one-joint emergency repair; and fault cables with different cross sections can be repaired at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of cable joints, in particular to an extended emergency repair joint and a method for a 110kV cross-linked polyethylene cable. Background Art

[0002] With the continuous development and progress of society, high-voltage cables and cable accessories are developing more and more rapidly. Although power cables have obvious advantages over traditional overhead transmission lines, the installation process of intermediate connectors is complicated and time-consuming, which makes it difficult to restore cable lines, especially high-voltage cable lines, in a short time once a failure occurs, which seriously endangers the safe operation of the power grid.

[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 provide an extended emergency repair joint and method for 110kV cross-linked polyethylene cable in order to overcome the defects of the above-mentioned prior art that the traditional fault repair method is to add a cable intermediate joint at both ends of a cable for repair, which takes a long time to repair and has a complicated installation process.

[0005] The purpose of the present invention can be achieved by the following technical solutions: An extended emergency repair joint for a 110kV cross-linked polyethylene cable, 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; The insulating side connection assembly and the non-insulating side connection assembly both include a connector, a connection contact, a brake ring, a stress cone, a compression device, and a cable protection structure. The connector is crimped on the end of the epoxy assembly and realizes current conduction with the center conductor through the connection contact; the brake ring is installed at one end of the connector close to the cable installation position to position the cable; the stress cone is installed on the inner side of the end of the epoxy assembly, and the compression device is installed on 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; The non-insulated side connection assembly further comprises a connection flange which is fixed to the end of the epoxy assembly.

[0006] Furthermore, the epoxy resin part and the central conductor are an integrally formed structure.

[0007] Furthermore, the conductive area where the epoxy assembly is connected to the cable is coated with conductive paint.

[0008] Furthermore, the epoxy resin part is a stepped cylindrical structure with stepped ends; 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.

[0009] Furthermore, insulating waterproof glue is filled between the shell component and the epoxy resin part, and the shell component is provided with a glue filling port for filling the insulating waterproof glue.

[0010] 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.

[0011] The present invention also provides a cable installation method using the above-mentioned extended emergency repair joint for a 110 kV cross-linked polyethylene cable, comprising the following steps: 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; Install the insulating side connection components and the non-insulating side connection components on the insulating side and the non-insulating side of the assembly respectively, and assemble the cables.

[0012] Furthermore, the process of installing the cable on the insulation side of the assembly specifically includes the following steps: Obtain a cable and an insulation side connection assembly, and perform end treatment on the cable; crimp a connector equipped with a connection contact at the end to the insulation side end of the epoxy assembly; install a stress cone at the insulation side end of the epoxy assembly; install a brake ring at the insulation side end of the epoxy assembly, and make the brake ring located between the connector and the stress cone; insert the end-treated cable into the insulation side end of the epoxy assembly, and abut the connector; install a compression device at the insulation side end of the epoxy assembly, position the stress cone, and fix the compression device by bolts; install a cable protection structure on the outside of the connection between the cable and the epoxy assembly.

[0013] Furthermore, the process of installing the cable on the non-insulated side of the assembly specifically includes the following steps: Obtain the cable and non-insulated side connection components, and perform end processing on the cable; crimp a connector equipped with a connection contact at the end to the non-insulated side end of the epoxy assembly; install a stress cone at the non-insulated side end of the epoxy assembly; install a brake ring at the non-insulated side end of the epoxy assembly, and make the brake ring located between the connector and the stress cone; insert the cable with the end processing into the non-insulated side end of the epoxy assembly, and abut the connector; install a connecting flange at the insulated side end of the epoxy assembly; install a compression device at the insulated side end of the epoxy assembly, position the stress cone, and fix the compression device by bolts; install a cable protection structure on the outside of the connection between the cable and the epoxy assembly.

[0014] 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.

[0015] Compared with the prior art, the present invention has the following advantages: (1) The extended repair joint provided by the present invention is provided with an epoxy assembly formed by a central conductor and an epoxy resin part in one piece. The length of the extended repair joint can be selected according to the length of the cable line to be repaired, thereby realizing the extension function, and can solve the cable fault repair at a certain distance, realizing the transformation from the traditional two-joint repair to the one-joint repair; the two ends of the extended repair joint can also correspond to cables with different cross-sections, and the cable cross-sections on both sides do not interfere with each other, thereby realizing the simultaneous repair of faulty cables with different cross-sections; The epoxy assembly can be coated with conductive paint in the conductive area to achieve conductivity, and the area not coated with conductive paint acts as an insulating tube, realizing an integrated design of the insulating and conductive areas, enhancing the electrical connection performance of the product and reducing the installation process.

[0016] (2) The present invention realizes current conduction by crimping connectors at both ends of the epoxy assembly, and the connectors are inserted into the epoxy resin part through connecting contacts, thereby avoiding heating of the product.

[0017] (3) After the epoxy assembly is installed in the factory, insulating waterproof glue can be poured into the glue filling port of the shell component to enhance the electrical and mechanical properties of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an extended emergency repair joint for a 110kV cross-linked polyethylene cable provided in an embodiment of the present invention; Figure 2 A schematic diagram of an in-factory assembly structure of an epoxy assembly and a housing assembly provided in an embodiment of the present invention; In the figure, 1, center conductor, 2, epoxy assembly, 3, second protective shell, 4, connecting contact, 5, connecting head, 6, cable, 7, cable, 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. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Example 1 like Figure 1 and Figure 2As shown, this embodiment provides an extended emergency repair joint for a 110kV cross-linked polyethylene cable, which is used to connect a cable 6 at both ends, including a central 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 central conductor 1 and combined with the central 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; The insulating side connection assembly and the non-insulating side connection assembly both include a connector 5, a connecting contact 4, a brake ring 7, a stress cone 8, a compression device 11, and a cable protection structure. The connector 5 is crimped on the end of the epoxy assembly 2 and realizes current conduction with the central conductor 1 through the connecting contact 4; the brake ring 7 is installed at one end of the connector 5 close to the installation location of the cable 6, and is used to position the cable 6; the stress cone 8 is installed on the inner side of the end of the epoxy assembly 2, and the compression device 11 is installed at 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 6, and is used to seal and protect the connection between the cable 6 and the epoxy assembly 2; The non-insulated side connection assembly further includes a connection flange 10 , which is fixed to the end of the epoxy assembly 2 .

[0024] The extended repair joint uses a stress cone and a compression device to position it.

[0025] Preferably, the epoxy resin part 9 and the central conductor 1 are an integrally formed structure, which can ensure the performance of the electrical product.

[0026] Preferably, the epoxy resin part 9 is a stepped cylindrical structure with stepped ends; 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 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 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.

[0027] The epoxy assembly 9, the first protective shell 14, the second protective shell 3 and the third protective shell 15 can be assembled in the factory before leaving the factory. The first protective shell 14, the second protective shell 3 and the third protective shell 15 are fixed with sealing rings and bolts, which reduces the on-site installation steps and improves the repair efficiency.

[0028] The epoxy resin part 9 is in a stepped cylindrical shape, which is convenient for installation and positioning of the first protective shell 14, the second protective shell 3 and the third protective shell 15, and is convenient for assembly in the factory.

[0029] After the inner center conductor 1 of the extended emergency repair joint is crimped with the connector 5, the connector 5 is inserted into the epoxy resin part through the connecting contact 4 to achieve current conduction and avoid product heating.

[0030] The length of the epoxy assembly 9 can be adjusted according to actual conditions, which can solve the problem of insufficient cable length and has a sufficient flow cross section to meet the requirements of large currents.

[0031] 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.

[0032] Preferably, the conductive area where the epoxy assembly 2 is connected to the cable 6 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.

[0033] Preferably, insulating waterproof glue is filled between the shell component and the epoxy resin part 9, and the shell component is provided with a glue filling port for filling the insulating waterproof glue.

[0034] That is, after the two epoxy assemblies are installed in the factory, insulating waterproof glue is poured into the glue-filling port of the second protective shell 3 in the factory to enhance the electrical and mechanical properties of the product.

[0035] 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 6, 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 6.

[0036] Example 2 This embodiment provides a cable installation method using the above-mentioned extended emergency repair joint for 110kV cross-linked polyethylene cable, comprising the following steps: 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 line to be repaired; The insulating side connection components and the non-insulating side connection components are installed on the insulating side and the non-insulating side of the assembly respectively, and the cable 6 is assembled.

[0037] The process of installing the cable 6 on the insulation side of the extended emergency repair joint specifically includes the following steps: Obtain the cable 6 and the insulating side connection assembly, and perform end processing on the cable 6; crimp the connector 5 equipped with the connecting contact 4 at the end to the insulating side end of the epoxy assembly 2; install the stress cone 8 at the insulating side end of the epoxy assembly 2; install the brake ring 7 at the insulating side end of the epoxy assembly 2, and make the brake ring 7 located between the connector 5 and the stress cone 8; insert the end-processed cable 6 into the insulating side end of the epoxy assembly 2, and abut the connector 5; install the compression device 11 at the insulating side end of the epoxy assembly 2, position the stress cone 8, and fix the compression device 11 by bolts; install the cable protection structure outside the connection between the cable 6 and the epoxy assembly 2.

[0038] The process of installing the cable 6 on the non-insulated side of the extended repair joint specifically includes the following steps: Obtain the cable 6 and the non-insulated side connection assembly, and perform end processing on the cable 6; crimp the connector 5 equipped with the connection contact 4 at the end to the non-insulated side end of the epoxy assembly 2; install the stress cone 8 at the non-insulated side end of the epoxy assembly 2; install the brake ring 7 at the non-insulated side end of the epoxy assembly 2, and make the brake ring 7 located between the connector 5 and the stress cone 8; insert the end-processed cable 6 into the non-insulated side end of the epoxy assembly 2, and abut the connector 5; install the connecting flange 10 at the insulated side end of the epoxy assembly 2; install the compression device 11 at the insulated side end of the epoxy assembly 2, position the stress cone 8, and fix the compression device 11 by bolts; install the cable protection structure outside the connection between the cable 6 and the epoxy assembly 2.

[0039] 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. An extended repair joint for a 110 kV cross-linked polyethylene cable, used to connect cables (6) 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 two ends of the epoxy assembly (2); The insulating side connection assembly and the non-insulating side connection assembly both comprise a connector (5), a connecting contact (4), a brake ring (7), a stress cone (8), a compression device (11), and a cable protection structure. The connector (5) is crimped onto the end of the epoxy assembly (2) and conducts current with the center conductor (1) through the connecting contact (4); the brake ring (7) is installed at one end of the connector (5) close to the installation location of the cable (6) and is used to position the cable (6); the stress cone (8) is installed 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) 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 (6) and is used to seal and protect the connection between the cable (6) and the epoxy assembly (2); The non-insulated side connection assembly further comprises a connection flange (10), wherein the connection flange (10) is fixed to the end of the epoxy assembly (2).

2. The extended repair joint for 110kV cross-linked polyethylene cable according to claim 1, characterized in that: The epoxy resin part (9) and the central conductor (1) are an integrally formed structure.

3. The extended repair joint for 110kV cross-linked polyethylene cable according to claim 1, characterized in that: The conductive area where the epoxy assembly (2) is connected to the cable (6) is coated with conductive paint.

4. The extended repair joint for 110kV cross-linked polyethylene cable according to claim 1, characterized in that: The epoxy resin part (9) is a stepped cylindrical structure, and the two ends are stepped; the housing 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).

5. The extended repair joint for 110kV cross-linked polyethylene cable according to claim 1, characterized in that: Insulating waterproof glue is filled between the shell component and the epoxy resin part (9), and the shell component is provided with a glue injection port for injecting the insulating waterproof glue.

6. The extended repair joint for 110kV cross-linked polyethylene cable 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 (6); and the anti-corrosion layer (13) covers the end of the protective fitting (12) and the end of the exposed area of ​​the electric core of the cable (6).

7. A cable installation method using an extended emergency repair joint for a 110 kV cross-linked polyethylene cable 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 the processed epoxy assembly (2) and the housing assembly, and select an assembly of corresponding length according to the length of the cable line to be repaired; An insulating side connection component is installed on the insulating side and a non-insulating side connection component are installed on the non-insulating side of the assembly, and a cable (6) is assembled.

8. The method according to claim 7, characterized in that The process of installing the cable (6) on the insulation side of the assembly specifically comprises the following steps: Obtain a cable (6) and an insulation side connection assembly, and perform end processing on the cable (6); crimp a connector (5) equipped with a connection contact (4) at the end to the insulation side end of the epoxy assembly (2); install a stress cone (8) at the insulation side end of the epoxy assembly (2); install a brake ring (7) at the insulation side end of the epoxy assembly (2), and make the brake ring (7) located between the connector (5) and the stress cone (8); insert the cable (6) after the end processing into the insulation side end of the epoxy assembly (2) and abut the connector (5); install a compression device (11) at the insulation side end of the epoxy assembly (2), position the stress cone (8), and fix the compression device (11) by bolts; and install a cable protection structure outside the connection between the cable (6) and the epoxy assembly (2).

9. The method according to claim 7, characterized in that: The process of installing the non-insulated side cable (6) of the assembly specifically comprises the following steps: Obtain a cable (6) and a non-insulated side connection assembly, and perform end processing on the cable (6); crimp a connector (5) equipped with a connection contact (4) at the end to the non-insulated side end of the epoxy assembly (2); install a stress cone (8) at the non-insulated side end of the epoxy assembly (2); install a brake ring (7) at the non-insulated side end of the epoxy assembly (2), and make the brake ring (7) located between the connector (5) and the stress cone (8); insert the cable (6) after the end processing into the non-insulated side end of the epoxy assembly (2) and abut the connector (5); install a connection flange (10) at the insulated side end of the epoxy assembly (2); install a compression device (11) at the insulated side end of the epoxy assembly (2), position the stress cone (8), and fix the compression device (11) by bolts; and install a cable protection structure outside the connection between the cable (6) and the epoxy assembly (2).

10. The method according to claim 7, characterized in that The cross-sectional dimensions of the cables (6) assembled on the insulated side and the non-insulated side of the assembly are the same or different.

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