110kV cable connector

Abstract

The utility model relates to a 110kV cable connector, which belongs to the technical field of cable connection and comprises a conductor connecting pipe for connecting main core bodies of a cable A and a cable B, the cable connector further comprises a silicon rubber connector body, waterproof cement, a semi-conductive self-adhesive tape, an insulating self-adhesive tape, a copper net, a first PVC adhesive tape, a first heat shrinkage protective sleeve, a first insulating connector copper shell, a second insulating connector copper shell, a lead seal and a second waterproof adhesive tape, a second heat shrinkage protective sleeve is arranged on the outer side of the second waterproof adhesive tape, and the outer end of the second heat shrinkage protective sleeve is shrunk on insulating layers of the cables at the two ends. Two grounding electrodes are arranged on the first insulation joint copper shell and connected with grounding wires respectively, and the first insulation joint copper shell and the second insulation joint copper shell are filled with cable sealant. According to the utility model, other adjacent-phase cables are not influenced after a cable joint has a fault, and the metal sheath has good conductivity, is safer to ground, is convenient for switching operation modes, and can balance capacitance and current.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable connection, and more specifically relates to an 110 kV cable connector. Background Technique

[0002] In recent years, with the continuous development of the construction of China's power system, the demand for power cables has been increasing continuously. The cable connector is one of the weakest links in the cable line, and it is easily affected by factors such as manufacturing process, transportation environment, installation process, and construction environment.

[0003] A power cable connection structure with the patent number CN202422700426.X applied by our company before includes a conductor connection pipe connecting the main cores of cable A and cable B. A silicone rubber joint body is sleeved outside the conductor connection pipe. Anti-cement is provided at the cut-off points of the metal shielding layers of cable A and cable B. The outside of the anti-cement is wrapped with a semi-conductive self-adhesive tape. The inner ends of the semi-conductive self-adhesive tapes on both sides are wound around the silicone rubber joint body. A copper braid is provided outside the silicone rubber joint body. An epoxy resin fiberglass tape is provided outside the copper braid. The two ends of the epoxy resin fiberglass tape are respectively wrapped on the outer surfaces of cable A and cable B. The two ends of the copper braid are wrapped on the metal shielding layers of cable A and cable B. The good performance of the epoxy resin fiberglass tape is used to achieve the functions of waterproofing, earthquake resistance, and heat resistance; better waterproofing and explosion protection can be achieved.

[0004] However, for this kind of connection structure, after a fault, it will affect the operation of other adjacent-phase cables, and it cannot balance capacitance and current, and the electrical conductivity of the metal sheath is not good. Summary of the Utility Model

[0005] The utility model provides an 110 kV cable connector to solve the problems in the above background technique.

[0006] The utility model provides the following technical solutions:

[0007] An 110 kV cable connector includes a conductor connection pipe for connecting the main cores of cable A and cable B, and also includes a silicone rubber joint body, anti-cement, semi-conductive self-adhesive tape, insulating self-adhesive tape, copper mesh, PVC tape one, and heat shrinkable protective sleeve one. At both outer ends of the heat shrinkable protective sleeve one, there are insulating joint copper shells one and two. The inner copper pipe at the outer end of the insulating joint copper shell one is shrink-fixed on the metal sheath of cable A, and the inner copper pipe at the outer end of the insulating joint copper shell two is shrink-fixed on the metal sheath of cable B. There is a lead seal on the outer side of the inner copper pipes at the outer ends of the insulating joint copper shell one and the insulating joint copper shell two. There is a waterproof tape two on the outer side of the lead seal. There is a heat shrinkable protective sleeve two on the outer side of the waterproof tape two. The outer end of the heat shrinkable protective sleeve two shrinks on the insulation layers of the two ends of the cable. The inner ends of the two heat shrinkable protective sleeves two at both ends respectively shrink on the outer side walls of the outer ends of the insulating joint copper shell one and the insulating joint copper shell two. There are two non-connected grounding electrodes on the insulating joint copper shell one, which are respectively connected to the inner copper pipe of the insulating joint copper shell one and the inner copper pipe of the insulating joint copper shell two. The two grounding electrodes are respectively connected with ground wires. The insulating joint copper shell one and the insulating joint copper shell two are filled with cable sealant.

[0008] There is a waterproof tape three at the outer ends of the two heat shrinkable protective sleeves two at both ends. The outer end of the waterproof tape three is wound around the insulation layers of the two ends of the cable. There is a PVC tape two on the outer side of the waterproof tape three. The outer end of the PVC tape two is wound around the insulation layers of the two ends of the cable. The inner end of the PVC tape two overlaps on the two heat shrinkable protective sleeves two at both ends, which can better fix and seal the outer ends of the two heat shrinkable protective sleeves two at both ends, preventing loosening and water ingress.

[0009] The insulating joint copper shell one and the insulating joint copper shell two include an insulating outer shell cylinder. The inner copper pipe is fixed in the inner hole of the insulating outer shell cylinder. Conductive connection flanges one and two are respectively fixed at the inner ends of the insulating joint copper shell one and the insulating joint copper shell two, which is convenient for fixed connection. There is a connecting copper pipe in the inner wall of the insulating outer shell cylinder of the insulating joint copper shell one. The connecting copper pipe is fixed to the conductive connection flange one. The two grounding electrodes are respectively connected to the inner copper pipe of the insulating joint copper shell one and the connecting copper pipe. The inner copper pipe of the insulating joint copper shell two is fixed to the conductive connection flange two. This enables the two grounding electrodes to be respectively connected to the inner copper pipes of the insulating joint copper shell one and the insulating joint copper shell two and be grounded respectively, realizing cross-interconnection, so that the induced voltages in each section of the metal sheath cancel each other out or decrease, effectively reducing the induced voltage of the metal sheath, facilitating the conversion of the operation mode, and balancing capacitance and current.

[0010] A sealing ring is provided between the first conductive connection flange and the second conductive connection flange to better prevent glue leakage. A positioning concave hole is provided on the outer side of the inner end of the first conductive connection flange, and a positioning convex post is provided on the outer side of the inner end of the second conductive connection flange. The first conductive connection flange and the second conductive connection flange are fixedly connected by screws. The setting of the positioning concave hole and the positioning convex post can quickly position and align the screw holes on the first conductive connection flange and the second conductive connection flange, facilitating quick connection and fixation.

[0011] The outer ends of the two grounding electrodes respectively pass through the insulating outer shell cylinder, and a grounding connection pipe is sleeved on the outer side of the connection part with the grounding wire. A fourth waterproof tape is provided on the outer side of the grounding connection pipe, and a third heat shrinkable protective sleeve is provided on the outer side of the fourth waterproof tape. The grounding connection pipe can ensure the stability of the connection part, and the setting of the fourth waterproof tape and the third heat shrinkable protective sleeve can enhance the sealing and waterproof effect.

[0012] An injection hole is provided on the second copper shell of the insulating joint, and a sealing cover is provided at the injection hole for convenient injection. A fifth waterproof tape is provided on the outer side of the sealing cover, on the outer sides of the first conductive connection flange and the second conductive connection flange. A fourth heat shrinkable protective sleeve is sleeved on the outer side of the connection part between the first conductive connection flange and the second conductive connection flange. The fourth heat shrinkable protective sleeve wraps the fifth waterproof tape inside. The setting of the fifth waterproof tape and the fourth heat shrinkable protective sleeve can enhance the sealing and waterproof effect.

[0013] Connection ribs are provided on the end walls of the inner copper pipes at the outer ends of the first copper shell and the second copper shell of the insulating joint. Connection grooves matching the connection ribs are provided on the lead seal. The setting of the connection ribs makes it easier to fix the lead seal on the inner copper pipe and prevents it from falling off.

[0014] Connection rough surfaces are provided at the connection parts between the fourth heat shrinkable protective sleeve, the third heat shrinkable protective sleeve, the second heat shrinkable protective sleeve and the insulating outer shell cylinder of the first copper shell and the second copper shell of the insulating joint, so that after the fourth heat shrinkable protective sleeve, the third heat shrinkable protective sleeve and the second heat shrinkable protective sleeve shrink, it is better to prevent loosening.

[0015] The technical effects and advantages of the present utility model:

[0016] The first copper shell and the second copper shell of the insulating joint are sleeved at both ends of the outer side of the first heat shrinkable protective sleeve. The first copper shell and the second copper shell of the insulating joint are filled with cable sealing glue. The first copper shell and the second copper shell of the insulating joint are connected with grounding wires respectively connecting the metal sheaths at both ends of the cable. After a cable joint failure, it will not affect other adjacent-phase cables, and the metal sheath has good electrical conductivity, and grounding is safer, facilitating the conversion of the operation mode, and can balance capacitance and current. Brief Description of the Drawings

[0017] Figure 1 It is the front view structural schematic diagram of the present utility model;

[0018] Figure 2For Figure 1 Partial structural schematic diagram of Figure 1 ;

[0019] Figure 3 For Figure 1 Partial structural schematic diagram of Figure 2 ;

[0020] Figure 4 For Figure 3 Enlarged structural schematic diagram at position A in

[0021] Figure 5 Partial structural schematic diagram of the connection between the first copper shell of the insulating joint and the second copper shell of the insulating joint;

[0022] Reference numerals in the drawings are: 1, silicone rubber joint body; 2, conductor connecting pipe; 3, cable B; 4, cable A; 5, insulating self-adhesive tape; 6, first heat shrinkable protective sleeve; 7, first waterproof tape; 8, first PVC tape; 9, copper mesh; 10, semi-conductive self-adhesive tape; 11, anti-cement; 12, copper tie wire; 13, cable sealant; 14, second copper shell of the insulating joint; 15, second conductive connection flange; 16, first conductive connection flange; 17, third heat shrinkable protective sleeve; 18, grounding wire; 19, lead seal; 20, second waterproof tape; 21, third waterproof tape; 22, second PVC tape; 23, second heat shrinkable protective sleeve; 24, fourth waterproof tape; 25, grounding connection pipe; 26, first copper shell of the insulating joint; 27, fifth waterproof tape; 28, sealing cover; 29, positioning stud; 30, connecting copper pipe; 31, fourth heat shrinkable protective sleeve; 32, connecting rib. Specific embodiments

[0023] The following further describes the present utility model with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the drawings is for better explanation. The structure of the present utility model necessarily goes beyond these limited embodiments, and for some equivalent replacement schemes or common means, no detailed description will be given herein, but they still fall within the protection scope of the present application.

[0024] Embodiment 1, as shown in Figures 1 to 5As shown in the figure, the utility model provides a 110 kV cable connector, which includes a conductor connection pipe 2 for connecting the main cores of cable A 4 and cable B 3, and also includes a silicone rubber joint body 1, a waterproof cement 11, a semi-conductive self-adhesive tape 10, an insulating self-adhesive tape 5, a copper mesh 9, a PVC tape one 8, and a heat shrinkable protective sleeve one 6. At both outer ends of the heat shrinkable protective sleeve one 6, an insulating joint copper shell one 26 and an insulating joint copper shell two 14 are sleeved. The outer end inner copper pipe of the insulating joint copper shell one 26 is shrink-fixed on the metal sheath of cable A 4, and the outer end inner copper pipe of the insulating joint copper shell two 14 is shrink-fixed on the metal sheath of cable B 3. On the outer side of the outer end inner copper pipes of the insulating joint copper shell one 26 and the insulating joint copper shell two 14, a lead seal 19 is provided. On the outer side of the lead seal 19, a waterproof tape two 20 is provided. On the outer side of the waterproof tape two 20, a heat shrinkable protective sleeve two 23 is provided. The outer end of the heat shrinkable protective sleeve two 23 shrinks on the insulation layers of the two ends of the cable. The inner ends of the two heat shrinkable protective sleeves two 23 at both ends respectively shrink on the outer side walls of the outer ends of the insulating joint copper shell one 26 and the insulating joint copper shell two 14. On the insulating joint copper shell one 26, there are two non-connected grounding electrodes respectively connecting the inner copper pipe of the insulating joint copper shell one 26 and the inner copper pipe of the insulating joint copper shell two 14, and the two grounding electrodes are respectively connected with a grounding wire 18. The insulating joint copper shell one 26 and the insulating joint copper shell two 14 are filled with a cable sealing gel 13.

[0025] When connecting the cables, cut the cables A4 and B3 to be connected. The main cores are exposed at the heads, and the metal shielding layers are exposed outside the heads. The cut length of cable B3 is longer than that of cable A4. Heat shrinkable sleeves II 23, copper insulating joint shells I 26, copper insulating joint shells II 14, and heat shrinkable sleeves I 6 are sleeved on both ends of cables A4 and B3. Then, sleeve the silicone rubber joint body 1 on cable B3, move the silicone rubber joint body 1 to expose the main core of cable B3, and then connect the main cores of cables A4 and B3 using the conductor connecting pipe 2. Then, move the silicone rubber joint body 1 so that the silicone rubber joint body 1 is sleeved outside the conductor connecting pipe 2. Then, wind the anti-cement 11 around the cut-off parts of the metal sheaths of cables A4 and B3, wind the semi-conductive self-adhesive tape 10 outside the anti-cement 11, and the outside of the semi-conductive self-adhesive tape 10 is wound and pressed on the exposed metal sheaths of cables A4 and B3, and the inside of the semi-conductive self-adhesive tape 10 is wound on the silicone rubber joint body 1. After winding the semi-conductive self-adhesive tape 10, wind the copper mesh 9 and PVC tape I 8 in sequence on the outside. Then, wind the insulating self-adhesive tape 5 on the upper end of the silicone rubber joint body 1, and the two ends of the insulating self-adhesive tape 5 are pressed on the outer sides of the ends of the semi-conductive self-adhesive tape 10, copper mesh 9, and PVC tape I 8. Then, wind the waterproof tape I 7. Then, move the position of the heat shrinkable sleeve I 6 so that the heat shrinkable sleeve I 6 is sleeved outside the waterproof tape I 7. Then, move the copper insulating joint shells I 26 and copper insulating joint shells II 14 on both sides to complete docking, fixing, and sealing, and shrink and fix the outer inner copper pipes of the copper insulating joint shells I 26 and copper insulating joint shells II 14 on the metal sheaths of cables A4 and B3. Then, seal the outer ends of the inner copper pipes with lead seals 19, and then wind the waterproof tape II 20 outside the lead seals 19. Then, move the heat shrinkable sleeve II 23 to shrink the heat shrinkable sleeve II 23, and then inject cable sealant 13 into the copper insulating joint shells I 26 and copper insulating joint shells II 14.

[0026] Example 2: On the basis of Example 1, waterproof tapes III 21 are provided at the outer ends of the heat shrinkable sleeves II 23 at both ends. The outer ends of the waterproof tapes III 21 are wound on the insulating layers of the cables at both ends. PVC tapes II 22 are provided outside the waterproof tapes III 21. The outer ends of the PVC tapes II 22 are wound on the insulating layers of the cables at both ends. The inner ends of the PVC tapes II 22 are lapped on the heat shrinkable sleeves II 23 at both ends. After the heat shrinkable sleeves II 23 are shrunk, wind the waterproof tapes III 21 at the outer ends of the shrunk heat shrinkable sleeves II 23, and then wind the PVC tapes II 22.

[0027] The copper shell one 26 of the insulating joint and the copper shell two 14 of the insulating joint include an insulating outer shell cylinder. The inner copper tube is fixed in the inner hole of the insulating outer shell cylinder. A conductive connection flange one 16 and a conductive connection flange two 15 are respectively fixed at the inner ends of the copper shell one 26 of the insulating joint and the copper shell two 14 of the insulating joint. A connecting copper tube 30 is arranged in the inner wall of the insulating outer shell cylinder of the copper shell one 26 of the insulating joint. The connecting copper tube 30 is fixed to the conductive connection flange one 16. Two grounding electrodes are respectively connected to the inner copper tube and the connecting copper tube 30 of the copper shell one 26 of the insulating joint. The inner copper tube of the copper shell two 14 of the insulating joint is fixed to the conductive connection flange two 15.

[0028] A sealing ring is arranged between the conductive connection flange one 16 and the conductive connection flange two 15. A positioning concave hole is arranged on the outer side of the inner end of the conductive connection flange one 16. A positioning convex column 29 is arranged on the outer side of the inner end of the conductive connection flange two 15. The conductive connection flange one 16 and the conductive connection flange two 15 are fixedly connected by screws. When docking the conductive connection flange one 16 and the conductive connection flange two 15, align the positioning convex column 29 with the positioning concave hole to quickly align the screw holes, and then screw in the screws along the axial direction to fix and seal the copper shell one 26 of the insulating joint and the copper shell two 14 of the insulating joint.

[0029] The outer ends of the two grounding electrodes respectively pass through the insulating outer shell cylinder, and the outer side of the connection part with the grounding wire 18 is sleeved with a grounding connection tube 25. A waterproof tape four 24 is arranged on the outer side of the grounding connection tube 25. A heat shrinkable protective sleeve three 17 is arranged on the outer side of the waterproof tape four 24. When connecting the grounding wire 18, first put the heat shrinkable protective sleeve three 17 on the grounding wire 18, use the grounding connection tube 25 to crimp and fix the grounding electrode and the grounding wire 18, then wind the waterproof tape four 24 on the outside and both ends of the grounding connection tube 25, and then move the heat shrinkable protective sleeve three 17 to make the heat shrinkable protective sleeve three 17 shrink on the outer side of the waterproof tape four 24.

[0030] The copper shell two 14 of the insulating joint is provided with a glue injection hole. A sealing cover 28 is arranged at the glue injection hole. A waterproof tape five 27 is arranged on the outer side of the sealing cover 28, and on the outer sides of the conductive connection flange one 16 and the conductive connection flange two 15. A heat shrinkable protective sleeve four 31 is sleeved on the outer side of the connection part between the conductive connection flange one 16 and the conductive connection flange two 15. The heat shrinkable protective sleeve four 31 wraps the waterproof tape five 27 inside. Before installing the copper shell two 14 of the insulating joint, first put the heat shrinkable protective sleeve four 31 on the outer side of the copper shell two 14 of the insulating joint. After the cable sealant 13 is poured, close the glue injection hole with the sealing cover 28, then wind the waterproof tape five 27 on the outer side of the sealing cover 28, and on the outer sides of the conductive connection flange one 16 and the conductive connection flange two 15, and then move the heat shrinkable protective sleeve four 31 to make the heat shrinkable protective sleeve four 31 shrink.

[0031] A connecting rib 32 is provided on the inner copper tube end wall of the outer end of the insulating joint copper shell 1 26 and the insulating joint copper shell 2 14 , and a connecting groove matching the connecting rib 32 is provided on the lead seal 19 .

[0032] The heat shrinkable sheath tube 4 31, the heat shrinkable sheath tube 3 17, the heat shrinkable sheath tube 2 23 and the insulating outer shell tubes of the insulating joint copper shell 1 26 and the insulating joint copper shell 2 14 are all provided with a connection rough surface. The connection rough surface can be a cross grain processed during the production of the insulating joint copper shell 1 26 and the insulating joint copper shell 2 14 or a connection surface with a high roughness. Copper wires 12 are provided at both ends of the PVC tape 1 8.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0034] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

Claims

1. A 110 kV cable connector, comprising a conductor connection tube (2) for connecting the main core of a cable A (4) and a cable B (3), and also comprising a silicone rubber joint body (1), waterproof cement (11), a semi-conductive self-adhesive tape (10), an insulating self-adhesive tape (5), a copper mesh (9), a PVC tape (8), and a heat shrinkable sheath (6), characterized in that: The outer ends of the heat shrinkable sheath tube 1 (6) are covered with insulating joint copper shell 1 (26) and insulating joint copper shell 2 (14). The inner copper tube at the outer end of the insulating joint copper shell 1 (26) is shrunk and fixed on the metal sheath of the cable A (4). The inner copper tube at the outer end of the insulating joint copper shell 2 (14) is shrunk and fixed on the metal sheath of the cable B (3). The outer sides of the inner copper tubes at the outer ends of the insulating joint copper shell 1 (26) and the insulating joint copper shell 2 (14) are provided with lead seals (19). The outer sides of the lead seals (19) are provided with waterproof tape 2 (20). The outer sides of the waterproof tape 2 (20) are provided with heat shrinkable sheath tube 2 (23). ), the outer ends of the heat shrinkable sheath tube 2 (23) are shrunk onto the insulation layers of the cables at both ends, the inner ends of the heat shrinkable sheath tube 2 (23) at both ends are shrunk onto the outer side walls of the outer ends of the insulating joint copper shell 1 (26) and the insulating joint copper shell 2 (14), respectively, the insulating joint copper shell 1 (26) is provided with two grounding electrodes which are not connected and are respectively connected to the copper tube inside the insulating joint copper shell 1 (26) and the copper tube inside the insulating joint copper shell 2 (14), the two grounding electrodes are respectively connected to the grounding wires (18), and the insulating joint copper shell 1 (26) and the insulating joint copper shell 2 (14) are filled with cable sealant (13).

2. A 110kV cable connector according to claim 1, characterized in that: The outer ends of the heat shrinkable sheath tubes (23) at both ends are provided with waterproof tapes (21), the outer ends of the waterproof tapes (21) are wound around the insulation layers of the cables at both ends, the outer sides of the waterproof tapes (21) are provided with PVC tapes (22), the outer ends of the PVC tapes (22) are wound around the insulation layers of the cables at both ends, and the inner ends of the PVC tapes (22) are overlapped on the heat shrinkable sheath tubes (23) at both ends.

3. A 110kV cable connector according to claim 1, characterized in that: The insulating joint copper shell 1 (26) and the insulating joint copper shell 2 (14) comprise an insulating outer shell cylinder, an inner copper tube is fixed in the inner hole of the insulating outer shell cylinder, the inner ends of the insulating joint copper shell 1 (26) and the insulating joint copper shell 2 (14) are respectively fixed with a conductive connecting flange 1 (16) and a conductive connecting flange 2 (15), a connecting copper tube (30) is provided in the inner wall of the insulating outer shell cylinder of the insulating joint copper shell 1 (26), the connecting copper tube (30) is fixed to the conductive connecting flange 1 (16), two grounding electrodes are respectively connected to the inner copper tube of the insulating joint copper shell 1 (26) and the connecting copper tube (30), and the inner copper tube of the insulating joint copper shell 2 (14) is fixed to the conductive connecting flange 2 (15).

4. A 110kV cable connector according to claim 3, characterized in that: A sealing ring is provided between the conductive connection flange 1 (16) and the conductive connection flange 2 (15); a positioning recess is provided on the outer side of the inner end of the conductive connection flange 1 (16); a positioning protrusion (29) is provided on the outer side of the inner end of the conductive connection flange 2 (15); and the conductive connection flange 1 (16) and the conductive connection flange 2 (15) are fixedly connected by screws.

5. A 110kV cable connector according to claim 3, characterized in that: The outer ends of the two grounding electrodes respectively pass through the insulating outer shell tube and are sheathed with a grounding connection tube (25) at the outer side of the connection with the grounding wire (18). The outer side of the grounding connection tube (25) is provided with a waterproof tape four (24), and the outer side of the waterproof tape four (24) is provided with a heat shrinkable sheath tube three (17).

6. A 110kV cable connector according to claim 4, characterized in that: The insulating joint copper shell 2 (14) is provided with a glue injection hole, and a sealing cover (28) is provided at the glue injection hole. The outer side of the sealing cover (28), the outer side of the conductive connection flange 1 (16) and the outer side of the conductive connection flange 2 (15) are all provided with a waterproof tape 5 (27). The outer side of the connection between the conductive connection flange 1 (16) and the conductive connection flange 2 (15) is covered with a heat shrinkable sheath tube 4 (31), and the heat shrinkable sheath tube 4 (31) covers the waterproof tape 5 (27) therein.

7. A 110kV cable connector according to claim 1, characterized in that: A connecting convex rib (32) is provided on the inner copper tube end wall of the outer end of the insulating joint copper shell 1 (26) and the insulating joint copper shell 2 (14), and a connecting groove matching the connecting convex rib (32) is provided on the lead seal (19).

8. A 110kV cable connector according to claim 6, characterized in that: The heat shrinkable sheath tube 4 (31), the heat shrinkable sheath tube 3 (17), the heat shrinkable sheath tube 2 (23) and the insulating outer shell tubes of the insulating joint copper shell 1 (26) and the insulating joint copper shell 2 (14) are all provided with a connection rough surface at the connection points.

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