110kV high-voltage cable joint and manufacturing process thereof

Abstract

The invention discloses a 110kV high-voltage cable joint and a manufacturing process thereof, relates to the technical field of high-voltage cables, and aims to solve the technical problems of high manufacturing cost and low construction efficiency of a current autonomously produced high-voltage cable joint, and the 110kV high-voltage cable joint comprises a joint and a cable connected with the joint, the cable comprises conductor wire cores, a semi-conductive nylon tape, a conductor shielding layer, an insulating layer, an insulating shielding layer, a semi-conductive buffer waterproof layer, a metal sleeve, an anti-corrosion isolation layer, a polyethylene outer sheath and a graphite coating. The conductor wire cores are arranged in the semi-conductive nylon tape, the semi-conductive nylon tape is arranged in the conductor shielding layer, and the conductor shielding layer is arranged in the insulating layer. By improving the manufacturing process of the high-voltage cable head, the high-voltage cable head is manufactured by a construction enterprise on site instead of being manufactured by a manufacturer, so that the manufacturing cost of the high-voltage cable head is reduced, the efficiency is higher when the high-voltage cable head is manufactured by the optimized method, the time for waiting for the manufacturer to convey the cable head is saved, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage cables, and more specifically to a 110kV high-voltage cable joint and a manufacturing process thereof. Background Art

[0002] The high-voltage cable products currently used in power projects have the characteristics of large transmission capacity, low operating temperature, no restrictions on drop, and convenient installation and laying, and are widely used in industrial and mining enterprises and urban power grids. High-voltage cross-linked cables are mainly used in power, construction, metallurgy and other industries.

[0003] In view of the advantages of 110KV high-voltage cables, high-voltage cables are gradually being used for laying in power projects. It is different from the production of ordinary 10kV and 35kV cable heads. In the production and installation process of 110kV high-voltage cables, the most important thing is the production of high-voltage cable heads. In the past, the relevant work of this work was often completed by the manufacturer. The production cost of self-produced high-voltage cable heads was high and the construction efficiency was low. In view of this, we propose a 110kV high-voltage cable joint and its production process. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, meet the actual needs, and provide a 110kV high-voltage cable connector and its manufacturing process to solve the technical problems of high manufacturing cost and low construction efficiency of the current independently produced high-voltage cable connector.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a 110kV high-voltage cable joint, comprising a joint, and a cable connected to the joint, wherein the cable comprises a conductor core, a semi-conductive nylon tape, a conductor shielding layer, an insulating layer, an insulating shielding layer, a semi-conductive buffer water-blocking layer, a metal sheath, an anti-corrosion isolation layer, a polyethylene outer sheath, and a graphite coating;

[0006] The conductor core is arranged in a semi-conductive nylon belt, the semi-conductive nylon belt is arranged in a conductor shielding layer, the conductor shielding layer is arranged in an insulating layer, the insulating layer is arranged in an insulating shielding layer, the insulating shielding layer is arranged in a semi-conductive buffer water-blocking layer, the semi-conductive buffer water-blocking layer is arranged in a metal sheath, the metal sheath is arranged in an anti-corrosion isolation layer, the anti-corrosion isolation layer is arranged in a polyethylene outer sheath, and the polyethylene outer sheath is arranged in a graphite coating.

[0007] A 110kV high voltage cable joint manufacturing process comprises the following steps:

[0008] S1: Install the epoxy casing: Connect the epoxy casing to the GIS combination electrical appliance;

[0009] S2: Cable processing: Process the outside of the cable to adapt to the assembly of the stress cone;

[0010] S3: Assembling the stress cone: Assembling the stress cone onto the cable;

[0011] S4: Assemble the terminal: Put the cable into the epoxy sleeve to complete the assembly of the cable structure.

[0012] Preferably, in step S1, firstly, the outer surface of the epoxy sleeve is cleaned and dried, the full-length screw is screwed into the GIS combination electrical appliance, the epoxy sleeve, paper gasket and flange are sequentially inserted into the GIS combination electrical appliance using a lifting device, and the fasteners are symmetrically tightened.

[0013] Preferably, the step S2 includes the following steps:

[0014] S1: After the cable appearance inspection is passed, saw the cable end to make the cable extend into the bottom flange plane of the GIS combination electrical appliance, thereby determining the cable end, removing the excess cable, and then temporarily fixing the cable on the cable bracket;

[0015] S2: Take a certain length downward from the end of the cable as the outer sheath end face, peel off 300mm of the outer sheath upward, clean the exposed 300mm metal sheath, and tin the 180-220mm metal sheath on the outer sheath end face;

[0016] S3: Keep 235-245mm metal sleeve upward from the end of the outer sheath, and remove the rest of the metal sleeve. The cross section is used as the end of the metal sleeve. Peel off the graphite layer on the surface of the outer sheath 150-250mm downward from the end of the outer sheath. Clean the remaining 235-245mm metal sleeve and remove 4-6 cross-sections of 35mm. 2 One end of the steel braided belt is tied with copper wire 40mm below the end of the metal sheath and welded. A heating belt is wrapped upward from 300mm above the end of the outer sheath. The cable is heated at 75-80℃ for 3 hours. Then a layer of black flame-retardant adhesive tape is wrapped 40mm above the end of the metal sheath. The semi-conductive buffer water-blocking layer above is removed.

[0017] S4: Saw off the reserved length, strip off the cable insulation layer from the end of the cable to the depth of the terminal hole plus 9-11mm, and round R5;

[0018] S5: 350-360mm downward from the end of the cable is used as the end of the semi-conductive buffer water-blocking layer, and a PVC adhesive tape is used as a temporary mark. The semi-conductive buffer water-blocking layer above the temporary mark is peeled off, and the end of the semi-conductive buffer water-blocking layer is grinded into a slope 20-30mm to make a smooth transition with the insulation layer. Then, the surface of the cable insulation layer is grinded off the scratches with a special belt grinder, and then finely polished with 600-mesh sandpaper;

[0019] S6: Measure and record the outer diameter of the insulation layer in two orthogonal directions at four locations. The difference between the values ​​measured in the two directions is within 0.5 mm, and the difference between the values ​​of two adjacent locations is within 0.5 mm. The outer diameter of the insulation layer is 2-5 mm larger than the inner diameter of the stress cone.

[0020] S7: Use a cleaning towel to clean the surface of the outer semi-conductive buffer water-blocking layer, and then wrap a layer of semi-conductive nylon tape half-overlappingly around the semi-conductive buffer water-blocking layer, wrap to 90 mm from the end of the semi-conductive buffer water-blocking layer, and then return to finish wrapping;

[0021] S8: From 90mm below the end of the semi-conductive buffer water-blocking layer to the end face of the metal sleeve, first wrap a layer of tinned copper mesh tape from top to bottom in a semi-overlapping manner, with the copper mesh tape overlapping the metal sleeve by 50mm. Tie the copper mesh tape tightly with tinned copper wire and weld it firmly. Then, from the top of the copper mesh tape, wrap a layer of black flame-retardant tape from top to bottom in a semi-overlapping manner, covering the lower end of the copper mesh tape. Use electrical tape to make a stress cone calibration mark 200mm below the fracture of the semi-conductive buffer water-blocking layer of the cable.

[0022] Preferably, the step S3 includes the following steps:

[0023] S1: Put the heat shrink tube, tail tube, sealing ring and cone support on the cable in sequence and place them below the terminal installation position. Use a cleaning towel soaked in detergent to clean the inner and outer surfaces of the stress cone, the cable insulation surface and the semi-conductive buffer water-blocking layer respectively;

[0024] S2: After the cleaning agent has completely evaporated, remove the temporary tape on the wire core and clean it. Put the stopper sleeve and terminal into the conductor and crimp them with an appropriate die. Remove the sharp corners and burrs at the crimping point and clean the metal dust with a cleaning towel.

[0025] Preferably, in the step S1 of assembling the stress cone, 3-5 layers of tape are used to wrap the cable conductor core before inserting the stress cone. The tape is removed after inserting it, and the stress cone position is marked with adhesive tape 55-57 mm downward from the end of the semi-conductive buffer water-blocking layer, and 486 mm downward from the end of the cable is marked with electrical tape as an epoxy sleeve entry mark, and then silicone oil is evenly applied to the surface of the cable insulation layer and the inner hole of the stress cone, the stress cone is inserted into the cable, and the bottom of the stress cone is covered with the stress material film to temporarily wrap the cable insulation layer and the stress cone.

[0026] Preferably, the step S4 includes the following steps:

[0027] S1: Remove the cable insulation layer and the temporary tape on the stress cone, apply a layer of silicone oil evenly on the upper cone surface of the stress cone and the inner cone surface of the epoxy sleeve, and insert the cable into the epoxy sleeve that has been cleaned until it is inserted. The cable terminal is completely inserted into the plug-in slot of the insert on the epoxy sleeve, and the lower end of the cable is fixed;

[0028] S2: Install the tightening screw at the bottom of the epoxy sleeve, install the cone support, install the nut on the tightening screw and tighten the cone support symmetrically and evenly to tighten the stress cone, and use the nut to tighten a 400mm long and 10mm cross-section 2 The tinned copper braid is fixed on the screw, and the other end of the braid is soldered to the metal sleeve;

[0029] S3: Check the position of the stress cone, measure the size between the check mark and the bottom of the stress cone, use waterproof tape to fill and wrap the metal sleeve end face and the range of 40mm below, and stop wrapping until the outer diameter is close to the inner hole size of the lower end of the tail pipe, put the sealing ring in the groove of the tail pipe and apply RTV silicone rubber, then assemble the tail pipe, tighten the bolts evenly, measure and control the temperature when sealing the lead, and the temperature at the lead sealing point is below 150C. After the lead sealing is completed, use stearic acid to cool down, and wrap the waterproof tape after the temperature drops. The waterproof tape covers the lead sealing point and the metal sleeve by at least 30mm;

[0030] S4: Move the heat shrink tube to the tail tube and heat it to shrink it. Overlap the upper part with the tail tube and the lower part with the outer sheath. Ground each grounding part. Finally, conduct the test according to the test items and standards to ensure that it passes in one go.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention improves the manufacturing process of high-voltage cable heads so that the high-voltage cable heads are manufactured on-site by construction companies instead of being manufactured by manufacturers, thereby reducing the manufacturing cost of the high-voltage cable heads. The optimized method is more efficient in manufacturing high-voltage cable heads, saving time waiting for manufacturers to deliver cable heads and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic cross-sectional view of the high voltage cable of the present invention.

[0034] Explanation of the numbers in the figure: 1. Conductor core; 2. Semi-conductive nylon tape; 3. Conductor shielding layer; 4. Insulation layer; 5. Insulation shielding layer; 6. Semi-conductive buffer water-blocking layer; 7. Metal sheath; 8. Anti-corrosion isolation layer; 9. Polyethylene outer sheath; 10. Graphite coating. DETAILED DESCRIPTION

[0035] Embodiment 1, as Figure 1 As shown, the present invention relates to a 110kV high-voltage cable joint, including a joint and a cable connected to the joint, wherein the cable includes a conductor core 1, a semi-conductive nylon tape 2, a conductor shielding layer 3, an insulating layer 4, an insulating shielding layer 5, a semi-conductive buffer water-blocking layer 6, a metal sheath 7, an anti-corrosion isolation layer 8, a polyethylene outer sheath 9, and a graphite coating 10;

[0036] The conductor core 1 is arranged in a semi-conductive nylon tape 2, the semi-conductive nylon tape 2 is arranged in a conductor shielding layer 3, the conductor shielding layer 3 is arranged in an insulating layer 4, the insulating layer 4 is arranged in an insulating shielding layer 5, the insulating shielding layer 5 is arranged in a semi-conductive buffer water-blocking layer 6, the semi-conductive buffer water-blocking layer 6 is arranged in a metal sheath 7, the metal sheath 7 is arranged in an anti-corrosion isolation layer 8, the anti-corrosion isolation layer 8 is arranged in a polyethylene outer sheath 9, and the polyethylene outer sheath 9 is arranged in a graphite coating 10.

[0037] Embodiment 2, as Figure 1 As shown, the present invention relates to a 110kV high-voltage cable joint manufacturing process, which is characterized by comprising the following steps:

[0038] S1: Install the epoxy sleeve: Connect the epoxy sleeve to the GIS combination electrical appliance; first clean the outer surface of the epoxy sleeve and dry it, screw the full-length screw into the GIS combination electrical appliance, use the lifting equipment to insert the epoxy sleeve, paper gasket, and flange into the GIS combination electrical appliance in sequence, and tighten the fasteners symmetrically;

[0039] S2: Cable processing: Process the outside of the cable to adapt to the assembly of the stress cone;

[0040] The specific steps include:

[0041] (1) After the cable appearance inspection is passed, saw the cable end to make the cable extend into the flange plane at the bottom of the GIS combination electrical appliance, thereby determining the cable end, removing excess cable, and then temporarily fixing the cable on the cable bracket;

[0042] (2) Take a certain length downward from the end of the cable as the end face of the outer sheath, peel off 300 mm of the outer sheath upward, clean the exposed 300 mm metal sheath 7, and tin the 200 mm metal sheath 7 on the end face of the outer sheath;

[0043] (3) Keep 240mm of metal sleeve 7 upward from the end face of the outer sheath, and remove the rest of the metal sleeve 7. The cross section is used as the end face of the metal sleeve 7. Peel off the graphite layer on the surface of the outer sheath 200mm downward from the end face of the outer sheath. Clean the remaining 240mm metal sleeve 7 and remove 5 cross-sections of 35mm. 2 One end of the steel braided belt is fastened with copper wire at 40mm below the end of the metal sheath 7 and welded firmly. A heating belt is wrapped upward from 300mm above the end of the outer sheath, and the cable is heated at 75℃ for 3 hours continuously. Then a layer of black flame-retardant adhesive tape is wrapped 40mm above the end of the metal sheath 7, and the semi-conductive buffer water-blocking layer 6 above is removed.

[0044] (4) Saw off the reserved length, strip off the cable insulation layer 4 from the end of the cable to the depth of the terminal hole plus 10 mm, and round R5;

[0045] (5) 355 mm downward from the end of the cable is used as the end of the semi-conductive buffer water-blocking layer 6, and a temporary mark is made with PVC adhesive tape. The semi-conductive buffer water-blocking layer 6 above the temporary mark is peeled off, and the end 25 mm of the semi-conductive buffer water-blocking layer 6 is polished into a slope to make a smooth transition with the insulating layer 4. Then, the surface of the cable insulating layer 4 is polished away with a special belt grinder to remove scratches, and then finely polished with 600-mesh sandpaper;

[0046] (6) Measure and record the outer diameter of the insulating layer 4 in two orthogonal directions at four locations. The difference between the values ​​measured in the two directions is within 0.5 mm, and the difference between the values ​​at two adjacent locations is within 0.5 mm. The outer diameter of the insulating layer 4 is 3.5 mm larger than the inner diameter of the stress cone.

[0047] (7) Clean the surface of the outer semi-conductive buffer water-blocking layer 6 with a cleaning towel, and then wrap the semi-conductive nylon tape 2 half-overlappingly around the semi-conductive buffer water-blocking layer 6 to 90 mm from the end of the semi-conductive buffer water-blocking layer 6 and then return to complete the wrapping;

[0048] (8) From 90 mm below the end of the semi-conductive buffer water-blocking layer 6 to the end face of the metal sleeve 7, first wrap a layer of tinned copper mesh tape from top to bottom in a semi-overlapping manner. The copper mesh tape and the metal sleeve 7 overlap by 50 mm. The copper mesh tape is fastened with tinned copper binding wire and welded. Then, from the top of the copper mesh tape, wrap a layer of black flame-retardant tape from top to bottom in a semi-overlapping manner to cover the lower end of the copper mesh tape. Use electrical tape to make a stress cone calibration mark 200 mm below the fracture of the cable semi-conductive buffer water-blocking layer 6.

[0049] S3: Assembling the stress cone: Assembling the stress cone onto the cable;

[0050] The specific steps include:

[0051] (1) Insert the heat shrink tube, tail tube, sealing ring, cone support on the cable in sequence and place it below the terminal installation position. Use a cleaning towel soaked in detergent to clean the inner and outer surfaces of the stress cone, the cable insulation surface and the semi-conductive buffer water-blocking layer 6 respectively; before inserting the stress cone, wrap the cable conductor core with 14 layers of tape. After inserting, remove the tape. Use adhesive tape to mark the stress cone position 56mm downward from the end of the semi-conductive buffer water-blocking layer 6. Use electrical tape to mark 486mm downward from the end of the cable as the epoxy sleeve entry mark. Then, evenly apply silicone oil on the surface of the cable insulation layer 4 and the inner hole of the stress cone, insert the stress cone into the cable, and cover the bottom of the stress cone with the stress material film to temporarily wrap the cable insulation layer 4 and the stress cone;

[0052] (2) After the cleaning agent has completely evaporated, remove the temporary tape on the wire core and clean it. Put the stopper sleeve and terminal into the conductor and crimp it with an appropriate crimping die. Remove the sharp corners and burrs at the crimping point and clean the metal dust with a cleaning towel.

[0053] S4: Assemble the terminal: Put the cable into the epoxy sleeve to complete the assembly of the cable structure.

[0054] Specifically include the following steps:

[0055] (1) Remove the cable insulation layer 4 and the temporary tape on the stress cone, apply a layer of silicone oil evenly on the upper cone surface of the stress cone and the inner cone surface of the epoxy sleeve, and insert the cable into the epoxy sleeve that has been cleaned until it is inserted. The cable terminal is completely inserted into the plug-in slot of the insert on the epoxy sleeve, and the lower end of the cable is fixed;

[0056] (2) Install the tightening screw at the bottom of the epoxy sleeve, install the cone support, install the nut on the tightening screw and tighten the cone support symmetrically and evenly to tighten the stress cone, and use the nut to tighten a 400mm long and 10mm cross-section cone. 2 The tinned copper braid is fixed on the screw, and the other end of the braid is soldered to the metal sleeve 7;

[0057] (3) Stress cone position calibration, 800mm 2 The following should be within 140mm, and those 1000mm and above should be within 146mm. Measure the size between the calibration mark and the bottom of the stress cone, and use waterproof tape to fill and wrap the metal sleeve 7 end face and the range of 40mm below, until the outer diameter is close to the inner hole size of the lower end of the tail pipe, put the sealing ring in the groove of the tail pipe and apply RTV silicone rubber, then assemble the tail pipe, tighten the bolts evenly, measure and control the temperature when sealing the lead, and the temperature at the lead sealing point should be below 150C. After the lead sealing is completed, use stearic acid to cool it down, and wrap the waterproof tape after the temperature drops. The waterproof tape should cover the lead sealing point and the metal sleeve 7 by at least 30mm;

[0058] (4) Move the heat shrink tube to the tail tube and heat it to shrink it. The upper part is overlapped with the tail tube, and the lower part is overlapped with the outer sheath. All grounding parts are grounded. Finally, the test is carried out according to the test items and standards to ensure that it passes in one go.

[0059] Things to note during installation:

[0060] 1. During the installation process, all tools and parts should be kept clean. When assembling parts that require multiple bolts to fix, do not screw each bolt all the way to the bottom. It is better to tighten them evenly diagonally one by one.

[0061] 2. When installing the epoxy casing, you need to work together with the personnel of the GIS switch manufacturer to avoid installation errors.

[0062] 3. When the cable enters the warehouse, ensure that the cable is vertical and enters slowly. Do not collide with the insulation inside the casing. If there is great resistance when entering, stop immediately. Do not pull it hard. Then withdraw it slightly downward, readjust the position and enter again.

[0063] 4. After the cables are put into the warehouse, immediately hold and fix the cables and mark them to prevent the cables from sliding down and the stress cones from being misplaced.

[0064] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A 110kV high voltage cable joint, characterized in that: It comprises a joint and a cable connected to the joint, wherein the cable comprises a conductor core (1), a semi-conductive nylon tape (2), a conductor shielding layer (3), an insulating layer (4), an insulating shielding layer (5), a semi-conductive buffering water-blocking layer (6), a metal sheath (7), an anti-corrosion isolation layer (8), a polyethylene outer sheath (9), and a graphite coating (10); The conductor core (1) is arranged in a semi-conductive nylon tape (2), the semi-conductive nylon tape (2) is arranged in a conductor shielding layer (3), the conductor shielding layer (3) is arranged in an insulating layer (4), the insulating layer (4) is arranged in an insulating shielding layer (5), the insulating shielding layer (5) is arranged in a semi-conductive buffer water-blocking layer (6), the semi-conductive buffer water-blocking layer (6) is arranged in a metal sleeve (7), the metal sleeve (7) is arranged in an anti-corrosion isolation layer (8), the anti-corrosion isolation layer (8) is arranged in a polyethylene outer sheath (9), and the polyethylene outer sheath (9) is arranged in a graphite coating (10).

2. A 110kV high voltage cable joint manufacturing process, characterized in that: The following steps are included: S1: Install the epoxy casing: Connect the epoxy casing to the GIS combination electrical appliance; S2: Cable processing: Process the outside of the cable to adapt to the assembly of the stress cone; S3: Assembling the stress cone: Assembling the stress cone onto the cable; S4: Assemble the terminal: Put the cable into the epoxy sleeve to complete the assembly of the cable structure.

3. A 110kV high voltage cable joint manufacturing process according to claim 2, characterized in that: In step S1, firstly, the outer surface of the epoxy sleeve is cleaned and dried, the full-length screw is screwed into the GIS combination electrical appliance, the epoxy sleeve, paper gasket and flange are sequentially inserted into the GIS combination electrical appliance using a lifting device, and the fasteners are symmetrically tightened.

4. A 110kV high voltage cable joint manufacturing process according to claim 2, characterized in that: The step S2 includes the following steps: S1: After the cable appearance inspection is passed, saw the cable end to make the cable extend into the bottom flange plane of the GIS combination electrical appliance, thereby determining the cable end, removing the excess cable, and then temporarily fixing the cable on the cable bracket; S2: Take a certain length downward from the end of the cable as the outer sheath end face, peel off 300mm of the outer sheath upward, clean the exposed 300mm metal sheath (7), and perform tinning treatment on the 180-220mm metal sheath (7) on the outer sheath end face; S3: Retain 235-245 mm of the metal sleeve (7) upward from the end surface of the outer sheath, and remove the rest of the metal sleeve (7). The cross section is used as the end surface of the metal sleeve (7). Peel off the graphite layer on the surface of the outer sheath 150-250 mm downward from the end surface of the outer sheath, clean the remaining 235-245 mm of the metal sleeve (7), and remove 4-6 cross-sections of 35 mm. 2 One end of the steel braided belt is fastened with a copper wire at a position 40 mm below the end surface of the metal sheath (7) and welded securely. A heating tape is wrapped upward from a position 300 mm above the end surface of the outer sheath, and the cable is heated continuously at 75-80° C. for 3 hours. A layer of black flame retardant adhesive tape is then wrapped 40 mm above the end surface of the metal sheath (7), and the semi-conductive buffer water-blocking layer (6) above is removed. S4: Saw off the reserved length, strip off the cable insulation layer (4) from the end of the cable to the depth of the terminal hole plus 9-11mm, and round R5; S5: 350-360 mm below the end of the cable is used as the end of the semi-conductive buffer water-blocking layer (6), and a PVC adhesive tape is used as a temporary mark, the semi-conductive buffer water-blocking layer (6) above the temporary mark is peeled off, and the end of the semi-conductive buffer water-blocking layer (6) is grinded 20-30 mm into a slope to make a smooth transition with the insulating layer (4), and then the surface of the cable insulating layer (4) is grinded away scratches with a special belt grinder, and then finely polished with 600-mesh sandpaper; S6: Measure and record the outer diameters of the insulating layer (4) in two orthogonal directions at four locations, the difference between the values ​​measured in the two directions is within 0.5 mm, the difference between the values ​​at two adjacent locations is within 0.5 mm, and the outer diameter of the insulating layer (4) is 2-5 mm larger than the inner diameter of the stress cone; S7: Clean the surface of the outer semi-conductive buffer water-blocking layer (6) with a cleaning towel, and then wrap a layer of semi-conductive nylon tape (2) around the semi-conductive buffer water-blocking layer (6) in a semi-overlapping manner, wrap to 90 mm from the end of the semi-conductive buffer water-blocking layer (6), and then return to complete the wrapping; S8: From 90 mm below the end of the semi-conductive buffer water-blocking layer (6) to the end face of the metal sleeve (7), a layer of tinned copper mesh tape is firstly wrapped from top to bottom in a semi-overlapping manner, and the copper mesh tape and the metal sleeve (7) are overlapped by 50 mm. The copper mesh tape is fastened with tinned copper binding wire and welded securely. Then, from the top of the copper mesh tape, a layer of black flame retardant tape is wrapped from top to bottom in a semi-overlapping manner to cover the lower end of the copper mesh tape. A stress cone calibration mark is made with electrical tape 200 mm below the fracture of the cable semi-conductive buffer water-blocking layer (6).

5. A 110kV high voltage cable joint manufacturing process according to claim 2, characterized in that: The step S3 includes the following steps: S1: insert the heat shrink tube, tail tube, sealing ring and cone support onto the cable in sequence and place them below the terminal installation position, and clean the inner and outer surfaces of the stress cone, the cable insulation surface and the semi-conductive buffer water-blocking layer (6) with a cleaning towel soaked in detergent; S2: After the cleaning agent has completely evaporated, remove the temporary tape on the wire core and clean it. Put the stopper sleeve and terminal into the conductor and crimp them with an appropriate die. Remove the sharp corners and burrs at the crimping point and clean the metal dust with a cleaning towel.

6. A 110kV high voltage cable joint manufacturing process according to claim 5, characterized in that: In the step S1 of assembling the stress cone, 3-5 layers of adhesive tape are used to wrap the cable conductor core (1) before inserting the stress cone. After inserting the stress cone, the adhesive tape is removed, and the stress cone position is marked with adhesive tape 55-57 mm downward from the end of the semi-conductive buffer water-blocking layer (6). 486 mm downward from the end of the cable is marked with electrical tape as an epoxy bushing entry mark. Then, silicone oil is evenly applied to the surface of the cable insulation layer (4) and the inner hole of the stress cone, and the stress cone is inserted into the cable. The bottom of the stress cone is covered with the stress material film to temporarily wrap the cable insulation layer (4) and the stress cone.

7. A 110kV high voltage cable joint manufacturing process according to claim 2, characterized in that: The step S4 includes the following steps: S1: Remove the cable insulation layer (4) and the temporary tape on the stress cone, apply a layer of silicone oil evenly on the upper cone surface of the stress cone and the inner cone surface of the epoxy sleeve, insert the cable into the epoxy sleeve that has been cleaned, until it is inserted, the cable terminal is completely inserted into the plug-in slot of the insert on the epoxy sleeve, and the lower end of the cable is fixed; S2: Install the tightening screw at the bottom of the epoxy sleeve, install the cone support, install the nut on the tightening screw and tighten the cone support symmetrically and evenly to tighten the stress cone, and use the nut to tighten a 400mm long and 10mm cross-section 2 A tinned copper braid is fixed on the screw rod, and the other end of the braid is soldered to the metal sleeve (7). S3: Check the position of the stress cone. Measure the size between the check mark and the bottom of the stress cone. Use waterproof tape to fill and wrap the metal sleeve (7) end face and the range of 40mm below. Stop wrapping until the outer diameter is close to the inner hole size of the lower end of the tail pipe. Place the sealing ring in the groove of the tail pipe and apply RTV silicone rubber. Then assemble the tail pipe. Tighten the bolts evenly. When sealing the lead, measure and control the temperature. The temperature of the lead sealing is below 150C. After the lead sealing is completed, use stearic acid to cool down. After the temperature drops, wrap the waterproof tape. The waterproof tape covers the lead sealing and the metal sleeve (7) by at least 30mm. S4: Move the heat shrink tube to the tail tube and heat it to shrink it. Overlap the upper part with the tail tube and the lower part with the outer sheath. Ground each grounding part. Finally, conduct the test according to the test items and standards to ensure that it passes in one go.

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