CN113555840A - Manufacturing process of self-melting insulating tape wrapped intermediate joint - Google Patents
Manufacturing process of self-melting insulating tape wrapped intermediate joint Download PDFInfo
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- CN113555840A CN113555840A CN202110825391.0A CN202110825391A CN113555840A CN 113555840 A CN113555840 A CN 113555840A CN 202110825391 A CN202110825391 A CN 202110825391A CN 113555840 A CN113555840 A CN 113555840A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/1806—Heat shrinkable sleeves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
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Abstract
The invention relates to a manufacturing process of a self-melting insulating tape lapping intermediate joint, which comprises the following steps: s1, cable pretreatment and wire core connection: pull out oversheath, armor, inner sheath, copper shield layer, outer semi-conducting layer, main insulation layer, the interior semi-conducting layer of two sections cables that wait to connect, utilize the sinle silk of connecting pipe connection two sections cables, S2, interior semi-conducting layer resume: s3, performing plasma treatment on the outer surface of the front end of the main insulating layer and manufacturing a cable joint, and S4, performing waterproof and mechanical protection treatment on the cable. The main insulating layer is made of cross-linked polyethylene material. The invention utilizes the self-melting insulating tape layer wrapping, does not need special heating equipment, adopts the plasma treatment technology of the plasma corona machine on the main insulating lapping surface of the cable, has the functions of increasing the wettability and the adhesive capacity of the cross-linked polyethylene interface, can ensure that the joint part of the wrapping insulating tape and the main insulating layer is more self-melting bonded, has no interface gap, and has the stripping force which can reach the breaking and breaking force of the cross-linked polyethylene insulating tape.
Description
Technical Field
The invention belongs to the technical field of power cable connection, and particularly relates to a manufacturing process of a self-melting insulating tape lapping intermediate joint.
Background
The recovery mode of the power cable intermediate joint has multiple modes, wherein the winding type cable intermediate joint and the welding type intermediate joint have the characteristics of strong manufacturing and capacitive property, high waterproof sealing degree, high product insulation resistance performance, strong construction randomness, capability of corresponding to connection between cables of different models and the like, and are widely applied to the aspects of power construction, fault rush repair and the like.
However, the wrapping type cable intermediate joint and the welding type intermediate joint still have some factors which influence the service life of the cable intermediate joint or cause faults and the like in the practical application and operation process, and the method mainly comprises the following points:
1. the intermediate joint of the winding and wrapping type cable has good waterproofness and insulativity and strong field flexibility and operability. But the process flow is complex, is easily influenced by construction environment, and has the defects of long manufacturing and installation time and the like. Secondly, in order to improve the insulating interface pressure, the wrapping thickness and the main insulating lap joint length are increased forcibly, the consumption of insulating strip material fusion-connection type intermediate joints is increased by times, the requirement on the electrical performance of the used strip material is high, and the cost is increased.
2. The welding type intermediate joint can generate high temperature of nearly 2000 ℃ during welding of the wire core and conduct the high temperature to the inner semi-conductor and the main insulating layer of the cable along the wire core, if cooling measures are not in place, the main insulating layer of the cable and the materials of the inner semi-conductor shielding layer and the outer semi-conductor shielding layer are thermally decomposed, and therefore interface odor is generated to reduce the insulating property. And secondly, the insulation recovery construction process of the crosslinked polyethylene of the intermediate joint is easily influenced by the environmental temperature and heating equipment, the insulation hot melting temperature is difficult to keep the melting temperature constant at 120-150 ℃, so that the hot melting of a main insulation interface is unstable, interface air gaps are generated, and insulation breakdown is caused.
Disclosure of Invention
The invention aims to provide a manufacturing process of a wrapped intermediate joint of a self-melting insulating tape, and solves the problems that the process flow of the wrapped cable intermediate joint and the welded intermediate joint is complex, the wrapped cable intermediate joint and the welded intermediate joint are easily influenced by construction environment, the installation and manufacturing time is long, the hot melting temperature is difficult to keep constant, and the cost of an insulating tape is high.
The invention relates to a manufacturing process of a self-melting insulating tape lapping intermediate joint, which comprises the following steps: s1, cable pretreatment and wire core connection: pull out two sections oversheath, armor, inner sheath, copper shield layer, outer semi-conducting layer, main insulation layer, the interior semi-conducting layer of waiting to connect the cable, expose the sinle silk, utilize the sinle silk of connecting pipe connection two sections cables, S2, interior semi-conducting layer resume: connecting the inner semi-conductive layers of the two sections of cables outside the connecting pipe by utilizing the semi-conductive belts to form an inner semi-conductive belt layer, and performing plasma treatment on the outer surface of the front end of the main insulating layer and manufacturing a cable joint by using the following steps of S3: s3.1, polishing and cleaning the outer surface of the front end of a main insulating layer of the cable, wherein the surface is free of impurities, S3.2 then carrying out plasma treatment on the outer surface of the front end of the main insulating layer of the cable to form a plasma treatment interface layer, S3.3 wrapping a self-melting insulating tape layer in an interval consisting of the plasma treatment interface layers and an inner semi-conducting tape layer of the cable at two ends, S3.4 connecting an outer semi-conducting tape layer of two sections of cables to the outer side of the wrapping self-melting insulating tape layer by utilizing the semi-conducting tape to form an outer semi-conducting tape layer, S3.5 connecting copper shielding layers of the two sections of cables to the outer side of the outer semi-conducting tape layer by utilizing a copper mesh sleeve, S3.6 sleeving a cold-shrink sleeve to the outer side of a recovered copper mesh sleeve to complete single-phase cable connection, and then treating each phase cable by adopting the same method; and (5) manufacturing each cable joint, and performing waterproof and mechanical protection treatment on the cable S4. The main insulating layer is made of cross-linked polyethylene material.
The specific steps of step S3.2 are: starting a plasma corona machine, opening a corona machine operation machine head switch, testing a machine head, adjusting a corona machine voltage rotary switch, after the output voltage of a standby head is stable, carrying out plasma treatment on the outer surface of the front end of a main insulating layer, keeping the distance between the flame of the plasma corona machine head and the outer surface of the front end of the processed main insulating layer at 3-5 mm during treatment, moving along the surface of one side of the main insulating layer of a cable at the moving speed of 10-15mm/s for 2-3 s every time, completely changing the outer surface of the front end of the main insulating layer of the cable to be treated into transparent cyan, and finishing the plasma treatment on an insulating interface.
The specific steps of step S3.3 are: and (3) stretching a self-melting ethylene propylene rubber insulating strip material by 2-3 times of the tape width, overlapping the tape width by half overlapping with 1/2 tape width, and lapping the tape back and forth along the surface of the recovered inner semi-conducting layer of the cable until the main insulating layer exposed out of the cable and the outer surface of the front end of the main insulating layer are lapped flatly.
The specific steps of step S3.4 are: starting from the copper shielding fracture of the cable on one side, a copper shielding layer of the outer semi-conductive belt is lapped, the copper shielding fracture of the cable on the other side is lapped along the recovered intermediate connector from the outer surface of the melting insulating belt, and the copper shielding fracture is lapped tightly with the recovered insulating layer and the copper shielding of the cable to form a joint outer semi-conductive layer.
And S3.5, moving the pre-sleeved copper mesh sleeve to a cable joint, fixing two ends of the copper mesh sleeve on cable copper shielding layers at two sides by using two constant force springs, tightly wrapping the copper mesh sleeve on the surface of the cable joint by using an adhesive tape, and completely wrapping the constant force springs and burrs of the copper mesh sleeve.
And S3.6, sleeving the cold-shrink tube to the outer side of the recovered copper mesh sleeve, keeping the two ends symmetrical, and drawing out the support bar of the cold-shrink tube. The cold shrink tube can better improve the holding capacity between the layers of the wrapping insulating strips, increase the fusion capacity between the layers of the wrapping insulating strips, improve the partial discharge voltage and improve the waterproof sealing performance of the cable intermediate joint.
The specific step of step S1: s1.1, for two sections of cables to be connected, treating the two ends of the cables according to the length of 400-700mm of the cables required by convenient lapping construction operation; stripping the outer sheath of the cable and the armor layer to expose the inner sheath, and stripping and cutting the outer sheath of 20-30mm at the fracture of the outer sheath of the cable to expose the armor layer of the cable; reserving a 10-20mm inner sheath at the fracture of the cable armor layer, cutting off the inner sheath and the filler, and exposing the copper shielding layers of the phase cables; s1.2, processing each cable: stripping the copper shielding layer according to the length of a 20mm + 10-primary insulation thickness +1/2 connecting pipe; reserving an outer semi-conducting layer of 10-25mm, and stripping the outer semi-conducting layer to expose the main insulating layer; stripping 1/2 the main insulating layer of the cable with the length of the connecting pipe to expose the inner semi-conducting layer and the core of the cable; s1.3, cutting the main insulation end part of the cable into a pencil-head-shaped reaction force cone, wherein the length of the reaction force cone is 10 × the main insulation thickness, and polishing the pencil-head-shaped reaction force cone at the main insulation end part of the cable by using 240-mesh 600-mesh abrasive paper to be smooth without edges, fins and burrs; s1.4, before the core of each phase of cable of the cable is connected, sleeving a copper mesh sleeve and a cold-shrink tube; s1.5, exposing two wire cores of a pair of cables to be butted to a conductor part for oxidation layer treatment, polishing and cleaning, sleeving a cleaned connecting pipe into the end parts of the two wire core conductors to be butted, then carrying out symmetrical crimping, and polishing the crimping surface to smooth and burr-free.
The specific step of S2: the semi-conducting layer in the cable that accomplishes connecting pipe one end by crimping processing plays, uses the semi-conducting band with 1/2 bandwidth half overlapping lap joint, winds along the connecting pipe surface and wraps to the semi-conducting layer in the cable of the other end to it is inseparable with semi-conducting layer lap joint in the cable, forms the circular interior semi-conducting band layer of connector.
The specific step of step S4: binding the phase cable joints together by using a waterproof adhesive tape, and recovering the inner sheath to form a cable joint; the cable armor layers exposed out of the cable outer sheath fracture positions on the two sides of the cable joint are communicated through copper braided wires, the two ends of each copper braided wire are fixed on the cable armor layers on the two sides through constant-force springs, and then the constant-force springs on the two sides are firmly wrapped through adhesive tapes to form a cable metal shielding tape; polishing the cable outer sheaths on the two sides of the cable joint, and overlapping and wrapping a waterproof belt from the cable outer sheath on one side of the cable joint to the cable outer sheath on the other side to form a cable waterproof layer; and the cable armor layer is formed by wrapping the armor belt outside the cable waterproof layer in a semi-lap joint manner.
Compared with the prior art, the invention has the advantages that:
1. the self-melting insulating tape layer is used for wrapping, the insulating tape material is self-melted at the normal temperature of 15-40 ℃, the heating tape can be used for heating in winter, and special heating equipment is not needed.
2. The plasma corona machine has the advantages that the plasma treatment technology for the main insulating lapping surface of the cable has the functions of increasing the wettability and the adhesion capacity of a crosslinked polyethylene interface, so that the joint part of a lapping insulating strip and a main insulating layer can be bonded in a self-melting mode without interface gaps, and the stripping force can reach the breaking and breaking force of the crosslinked polyethylene insulating strip;
3. the pressure resistance strength of the middle joint of the manufactured cable is equal to or higher than that of the insulation of a cable body, the partial discharge initial voltage is high, the breakdown is not easy to occur, and the breakdown voltage can reach 5U0/1 hour;
4. the conical stress evacuation structure is not required to be added at the joint of the outer semiconductor and the main insulation, only the outer semiconductor is required to be recovered, the process is simple, the recovered insulation thickness is basically consistent with that of the cable body, and compared with the conventional lapping type cable intermediate joint, the material can be saved by 80%, and the manufacturing time can be saved by 50%;
5. the waterproof sealing performance is high, long-term safe operation under the water immersion condition in a high water level area can be met, the service life of the manufactured cable intermediate joint can be 30 years longer than that of a cable body;
6. the cable can be used for connecting a 6kV-35kV two-section three-core cable and a single-core cable, and can be used for processing the cable without damaging the wire core and cutting off the cable;
7. the construction scheme can be adjusted according to the actual situation on site, and cables with different specifications and different wire diameters can be connected at will.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a schematic structural diagram of a single-phase cable joint;
in the figure: 1. a cable; 2, cold shrinking the pipe; 3. an inner semiconductive layer; 4. a connecting pipe; 5. a wire core; 6. self-melting the insulating tape layer; 7. plasma processing the interface layer; 8. a main insulating layer; 9. an outer semiconducting layer; 10. a copper shield layer; 11. constant force spring, 12, inner semi-conductive band layer, 13, outer semi-conductive band layer, 14, copper mesh.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Example 1, taking a ZR-YJV22-3 × 120-8.7/15 cable as an example, as shown in fig. 1 to 2, the present invention is a process for manufacturing a self-melting insulation tape wrapped intermediate joint, comprising the following steps: s1, cable pretreatment and wire core 5 connection: dial out two sections oversheath, armor, inner sheath, copper shield layer 10, the outer semi-conducting layer 9, the main insulation layer 8, the interior semi-conducting layer 3 of waiting the cable of connecting, expose sinle silk 5, utilize connecting pipe 4 to connect the sinle silk 5 of two sections cables 1, S2, the recovery of interior semi-conducting layer 3: connecting the inner semi-conducting layers 3 of two sections of cables 1 outside the connecting pipe 4 by utilizing the semi-conducting belts to form an inner semi-conducting belt layer 12, S3, plasma treatment of the outer surface of the front end of the main insulating layer 8 and cable joint manufacturing: s3.1, polishing and cleaning the outer surface of the front end of a main insulating layer 8 of a cable 1, wherein the surface is free of impurities, S3.2 then carrying out plasma treatment on the outer surface of the front end of the main insulating layer 8 of the cable 1 to form a plasma treatment interface layer 7, S3.3 winds a self-melting insulating tape layer 6 in an interval consisting of the plasma treatment interface layer 7 and an inner semi-conducting tape layer 12 of the cable 1 at two ends, S3.4 utilizes a semi-conducting tape to connect outer semi-conducting layers 9 of two sections of cables 1 outside the winding self-melting insulating tape layer 6 to form an outer semi-conducting tape layer 13, S3.5 utilizes a copper mesh sleeve 14 to connect copper shielding layers 10 of the two sections of cables 1 outside the outer semi-conducting tape layer 13, and S3.6 sleeves a cold-shrinkable tube 2 outside a recovered copper mesh sleeve 14 to complete the connection of the single-phase cable 1, as shown in figure 2, and then each phase cable 1 is treated by the same method; and (5) manufacturing each cable joint, and performing waterproof and mechanical protection treatment on the cable S4.
The specific steps of step S3.2 are: the plasma corona machine is connected with a 220V power supply or a generator power supply, a ZLD type plasma corona machine is started, a corona machine operation machine head switch is turned on, a machine head is tested, a corona machine voltage rotary switch is adjusted, plasma treatment can be carried out on the outer surface of the front end of the main insulation layer 8 of the cross-linked polyethylene after the output voltage indicated by a display screen pointer is stabilized at 10kV, the flame of the plasma corona machine head keeps a distance of 3-5 mm from the outer surface of the front end of the main insulation layer 8 of the processed cable 1 and moves along the surface of one side of the main insulation layer of the cable 1 at a moving speed of 10-15mm/s, the plasma treatment is carried out for 2-3 s every time of movement, the outer surface of the front end of the main insulation layer 8 of the cable 1 to be processed is completely changed into transparent cyan, and plasma treatment on an insulation interface is completed.
The specific steps of step S3.3 are: and (3) stretching a self-melting ethylene propylene rubber insulating strip by 2-3 times of the tape width, overlapping the tape width by half with 1/2 tape width, and lapping the tape back and forth along the surface of the inner semi-conductive layer 3 of the restored cable 1 until the main insulating layer 8 exposed out of the cable 1 and the outer surface of the front end of the main insulating layer 8 are lapped flatly.
The specific steps of step S3.4 are: starting from the copper shielding fracture of the cable 1 on one side, a copper shielding layer 10 of the semi-conductive belt is lapped, the outer surface of the insulation belt layer 6 is lapped to the copper shielding fracture of the cable 1 on the other side along the recovered intermediate connector, and the copper shielding layer and the insulation layer recovered by the cable 1 are lapped tightly to form a semi-conductive belt layer 13 outside the joint.
Moving the pre-sleeved copper net sleeve 14 to a cable joint, fixing two ends of the copper net sleeve 14 on the copper shielding layers 10 of the cables 1 at two sides by using two constant force springs 11, tightly wrapping the copper net sleeve 14 on the surface of the cable joint by using a PVC adhesive tape, and completely wrapping burrs of the constant force springs 11 and the copper net sleeve 14.
And sleeving the cold shrink tube 2 to the outer side of the recovered copper mesh sleeve 14, keeping two ends symmetrical, and drawing out the support bars of the cold shrink tube 2.
The specific step of step S1: s1.1, for two sections of cables to be connected, processing two ends of each cable according to the length of 450mm of the cable required by convenient wrapping construction operation; stripping the outer sheath of the cable and the armor layer to expose the inner sheath, and stripping and cutting the outer sheath of 30mm at the fracture of the outer sheath of the cable to expose the armor layer of the cable; reserving a 10mm inner sheath at the fracture of the cable armor layer, cutting off the inner sheath and fillers, and exposing the copper shielding layer 10 of each phase cable 1; s1.2, processing each cable 1: stripping the 110mm copper shielding layer 10 according to the length of the connecting pipe 4 with the main insulation thickness of 20mm +10 and the length of 1/2; reserving an outer semi-conducting layer 9 with the thickness of 10mm, stripping the outer semi-conducting layer 9 and exposing the main insulating layer 8; stripping a main insulating layer 8 of the 45mm cable 1 to expose the inner semi-conductive layer 3 and a cable core 5 of the cable 1; s1.3, cutting the main insulating end part of the cable 1 into a pencil-head-shaped reaction force cone, wherein the length of the reaction force cone is 45mm, and polishing the pencil-head-shaped reaction force cone at the main insulating end part of the cable 1 by 400-mesh abrasive paper to be smooth without edges, fins and burrs; s1.4, before the conductor of each phase of cable 1 of the cable is connected, sleeving a copper mesh sleeve 14 and a cold-shrink tube 2; s1.5, conducting oxide layer treatment on the exposed wire core 5 parts of the two wire cores 5 of the pair of cables 1 to be butted, polishing and cleaning, sleeving the cleaned connecting pipe 4 into the conductor end parts of the two wire cores 5 to be butted, symmetrically crimping from the middle to the two sides, and polishing the crimping surface to be smooth and burr-free.
The specific step of S2: the semi-conducting layer 3 in the cable 1 at one end of the connecting pipe 4 is completed by crimping treatment, the semi-conducting belt is used for half-overlapping and overlapping with the bandwidth of 1/2, the semi-conducting layer 3 in the cable 1 at the other end is wrapped along the surface of the connecting pipe 4, and the semi-conducting belt is tightly overlapped with the semi-conducting layer 3 in the cable 1 to form a circular inner semi-conducting belt layer 12 of the connector.
The specific step of step S4: binding the phase cable joints together by using a waterproof adhesive tape, and recovering the inner sheath to form a cable joint; the cable armor layers exposed out of the cable outer sheath fracture positions on the two sides of the cable joint are communicated through copper braided wires, the two ends of each copper braided wire are fixed on the cable armor layers on the two sides through constant-force springs 11, and then the constant-force springs 11 on the two sides are firmly wrapped through PVC adhesive tapes to form a cable metal shielding tape; polishing the cable outer sheaths on the two sides of the cable joint, and overlapping and wrapping a waterproof belt from the cable outer sheath on one side of the cable joint to the cable outer sheath on the other side to form a cable waterproof layer; and the cable armor layer is formed by wrapping the armor belt outside the cable waterproof layer in a semi-lap joint manner.
Example 2, the difference between the ZR-YJV22-3 × 400-8.7/15 cable as an example and example 1,
the specific step of step S1: s1.1, for two sections of cables to be connected, processing two ends of each cable according to the length of 650mm of the cable required by convenient wrapping construction operation; stripping the outer sheath of the cable and the armor layer to expose the inner sheath, and stripping and cutting the outer sheath of 30mm at the fracture of the outer sheath of the cable to expose the armor layer of the cable; reserving a 10mm inner sheath at the fracture of the cable armor layer, cutting off the inner sheath and fillers, and exposing the copper shielding layer 10 of each phase cable 1; s1.2, processing each cable 1: stripping the 130mm copper shielding layer 10 according to the length of the connecting pipe 4 with the main insulation thickness of 20mm +10 and the length of 1/2; reserving an outer semi-conducting layer 9 with the thickness of 10mm, stripping the outer semi-conducting layer 9 and exposing the main insulating layer 8; stripping a main insulating layer 8 of the 65mm cable 1 to expose the inner semi-conductive layer 3 and a cable core of the cable 1; s1.3, cutting the main insulating end part of the cable 1 into a pencil-head-shaped reaction force cone, wherein the length of the reaction force cone is 45mm, and polishing the pencil-head-shaped reaction force cone at the main insulating end part of the cable 1 by 400-mesh abrasive paper to be smooth without edges, fins and burrs; s1.4, before the conductor of each phase of cable 1 of the cable is connected, sleeving a copper mesh sleeve 14 and a cold-shrink tube 2; s1.5, exposing the core part of the two cores 5 of the cable 1 to be butted to carry out oxidation layer treatment, polishing and cleaning, sleeving the cleaned connecting pipe 4 into the end parts of the two cores 5 to be butted, symmetrically crimping from the middle to the two sides, and polishing the crimping surface to smooth and burr-free.
Steps S2 to S4 were performed in the same manner as in example 1.
Example 3, the difference between the ZR-YJV22-3 × 50-8.7/15 cable as an example and example 1,
the specific step of step S1: s1.1, for two sections of cables to be connected, processing two ends of each cable according to the length of 450mm of the cable required by convenient wrapping construction operation; stripping the outer sheath of the cable and the armor layer to expose the inner sheath, and stripping and cutting the outer sheath of 30mm at the fracture of the outer sheath of the cable to expose the armor layer of the cable; reserving a 10mm inner sheath at the fracture of the cable armor layer, cutting off the inner sheath and fillers, and exposing the copper shielding layer 10 of each phase cable 1; s1.2, processing each cable 1: stripping the 100mm copper shielding layer 10 according to the length of the connecting pipe 4 with the main insulation thickness of 20mm +10 and the length of 1/2; reserving an outer semi-conducting layer 9 with the thickness of 10mm, stripping the outer semi-conducting layer 9 and exposing the main insulating layer 8; stripping a main insulating layer 8 of the 35mm cable 1 to expose the inner semi-conductive layer 3 and a cable core of the cable 1; s1.3, cutting the main insulating end part of the cable 1 into a pencil-head-shaped reaction force cone, wherein the length of the reaction force cone is 45mm, and polishing the pencil-head-shaped reaction force cone at the main insulating end part of the cable 1 by 400-mesh abrasive paper to be smooth without edges, fins and burrs; s1.4, before the conductor of each phase of cable 1 of the cable is connected, sleeving a copper mesh sleeve 14 and a cold-shrink tube 2; s1.5, exposing the core part of the two cores 5 of the cable 1 to be butted to carry out oxidation layer treatment, polishing and cleaning, sleeving the cleaned connecting pipe 4 into the end parts of the two cores 5 to be butted, symmetrically crimping from the middle to the two sides, and polishing the crimping surface to smooth and burr-free.
Steps S2 to S4 were performed in the same manner as in example 1.
A plasma treatment technology for the main insulating lapping surface of a cable belongs to a plasma treatment technology for a cross-linked polyethylene interface, has the advantages of increasing the wettability and the adhesive capacity of the cross-linked polyethylene interface, improving the adhesive capacity by the plasma treatment technology for the lapping insulating strip and the main insulating lapping surface of the cable, enabling the joint part of the lapping insulating strip and the main insulating cross-linked polyethylene to be more self-melting and bonding without interface gaps, enabling the stripping force to reach the breaking force of the cross-linked polyethylene insulating strip, enabling the compressive strength to be equal to or higher than the insulation of the cable body, having higher waterproof sealing performance, being capable of meeting the long-term safe operation under the water immersion condition in a high water level area, enabling the service life of a manufactured cable intermediate joint to be longer than that of the cable body and being 30 years.
A conical stress evacuation structure is not required to be added at the joint of the outer semi-conductor and the main insulation, the outer semi-conductor is only required to be restored, the restored insulation thickness is basically consistent with that of the cable body, and compared with the conventional wrapping type cable middle joint, the material can be saved by 80%, and the manufacturing time can be saved by 50%. The cable can be used for connecting two sections of three-core cables and single-core cables of 6kV-35 kV. When the three-core cable is used, an insulating sheath for protecting the three-core copper strip shielding layer 10 is arranged on the outer side of the copper strip shielding layer 10.
The ion treatment interface layer 7 is treated by a corona treatment machine, the corona treatment machine supplies power for single-phase 220V/50Kz, the power is 2KW, the output frequency is 15KHz-25Kz, and the output voltage is 10 KV. The principle is that high-frequency high-voltage is utilized to carry out corona discharge on the cross-linked polyethylene insulating surface of a treated cable (the high-frequency alternating current voltage reaches 5000-.
The pressure resistance strength of the middle joint of the manufactured cable is equal to or higher than that of the insulation of the cable body, the partial discharge initial voltage is high, the breakdown is not easy to occur, and the breakdown voltage can reach 5U0/1 hour.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "up", "down", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (9)
1. The manufacturing process of the self-melting insulating tape lapping intermediate joint is characterized by comprising the following steps of: s1, cable pretreatment and wire core (5) connection: dial except that two sections oversheath, armor, inner sheath, copper shield layer (10), outer semi-conducting layer (9), main insulation layer (8), interior semi-conducting layer (3) of waiting to connect the cable, expose sinle silk (5), utilize sinle silk (5) that connecting pipe (4) connect two sections cables (1), S2, interior semi-conducting layer (3) resume: connecting the inner semi-conducting layer (3) of two sections of cables (1) outside the connecting pipe (4) by utilizing the semi-conducting belt to form an inner semi-conducting belt layer (12), and performing plasma treatment on the outer surface of the front end of S3 and the main insulating layer (8) and manufacturing a cable joint: s3.1, polishing the outer surface of the front end of the main insulating layer (8) of the cable (1), cleaning, wherein the surface is free of impurities, S3.2 then carrying out plasma treatment on the outer surface of the front end of a main insulating layer (8) of the cable (1) to form a plasma treatment interface layer (7), S3.3 wrapping a self-melting insulating tape layer (6) in an interval formed by the plasma treatment interface layer (7) and an inner semi-conducting tape layer (12) of the cable (1) at two ends, S3.4 connecting an outer semi-conducting layer (9) of two sections of cables (1) to the outer side of the wrapping self-melting insulating tape layer (6) by utilizing a semi-conducting tape to form an outer semi-conducting tape layer (13), S3.5 connecting copper shield layers (10) of the two sections of cables (1) to the outer side of the outer semi-conducting tape layer (13) by utilizing a copper mesh sleeve (14), S3.6 sleeving a cold-shrinkage pipe (2) to the outer side of a recovered copper mesh sleeve (14) to complete connection of a single-phase cable (1), and then treating each phase cable (1) by adopting the same method; and (5) manufacturing each cable joint, and performing waterproof and mechanical protection treatment on the cable S4.
2. The manufacturing process of the self-melting insulating tape lapping intermediate joint as claimed in claim 1, characterized in that: the specific steps of step S3.2 are: starting a plasma corona machine, turning on a corona machine to operate a machine head switch, testing a machine head, adjusting a corona machine voltage rotary switch, and after the output voltage of a standby head is stable, carrying out plasma treatment on the outer surface of the front end of a main insulating layer (8), wherein the distance between the flame of the machine head of the plasma corona machine and the outer surface of the front end of the processed main insulating layer (8) is kept between 3mm and 5mm during treatment, the flame of the machine head of the plasma corona machine moves along the surface of one side of the main insulating layer of a cable (1), the moving speed is 10 to 15mm/s, the flame of the machine head of the plasma corona machine is kept for 2s to 3s each time, the outer surface of the front end of the main insulating layer (8) of the cable (1) to be treated is completely changed into transparent cyan, and the plasma treatment on an insulating interface is completed.
3. The manufacturing process of the self-melting insulating tape lapping intermediate joint as claimed in claim 1 or 2, wherein: the specific steps of step S3.3 are: and (2) stretching 2-3 times of the tape width of the self-melting ethylene propylene rubber insulating tape, overlapping the tape width by half overlapping with 1/2 tape width, and lapping the tape back and forth along the surface of the semi-conductive tape layer (12) in the restored cable (1) until the main insulating layer (8) exposed out of the cable (1) and the outer surface of the front end of the main insulating layer (8) are lapped flatly.
4. The manufacturing process of the self-melting insulating tape lapping intermediate joint as claimed in claim 3, characterized in that: the specific steps of step S3.4 are: starting from the copper shielding fracture of the cable (1) on one side, a semi-conductive belt lap joint section of copper shielding layer (10) is used, the outer surface of the insulating belt layer (6) is melted along the recovered intermediate connector, and the copper shielding fracture of the cable (1) on the other side is lapped and tightly lapped with the insulating layer and the copper shielding recovered by the cable (1), so that an outer semi-conductive belt layer (13) of the connector is formed.
5. The manufacturing process of the self-melting insulating tape lapping intermediate joint as claimed in claim 4, characterized in that: the specific steps of step S3.5 are: moving a pre-sheathed copper mesh sleeve (14) to a cable joint, fixing two ends of the copper mesh sleeve (14) on copper shielding layers (10) of cables (1) at two sides by using two constant force springs (11), tightly wrapping the copper mesh sleeve (14) on the surface of the cable joint by using an adhesive tape, and completely wrapping burrs of the constant force springs (11) and the copper mesh sleeve (14).
6. The manufacturing process of the self-melting insulating tape lapping intermediate joint as claimed in claim 5, characterized in that: the specific steps of step S3.6 are: and sleeving the cold shrink tube (2) to the outer side of the recovered copper mesh sleeve (14), keeping two ends symmetrical, and drawing out the support bars of the cold shrink tube (2).
7. The manufacturing process of the self-melting insulating tape lapping intermediate joint as claimed in claim 6, characterized in that: the specific steps of step S1 are: s1.1, for two sections of cables to be connected, treating the two ends of the cables according to the length of 400-700mm of the cables required by convenient lapping construction operation; stripping the outer sheath of the cable and the armor layer to expose the inner sheath, and stripping and cutting the outer sheath of 20-30mm at the fracture of the outer sheath of the cable to expose the armor layer of the cable; reserving a 10-20mm inner sheath at the fracture of the cable armor layer, cutting off the inner sheath and the filler, and exposing the copper shielding layer (10) of each phase cable (1); s1.2, processing each cable (1): stripping the copper shielding layer (10) according to the length of the connecting pipe (4) with the main insulation thickness of 20mm +10 and 1/2; reserving an outer semi-conducting layer (9) of 10-25mm, stripping the outer semi-conducting layer (9) and exposing the main insulating layer (8); stripping 1/2 to connect the main insulating layer (8) of the cable (1) with the length of the pipe (4) and expose the inner semi-conductive layer (3) and the core (5) of the cable (1); s1.3, cutting the main insulating end part of the cable (1) into a pencil-head-shaped reaction force cone, wherein the length of the reaction force cone is 10 × the main insulating thickness, and polishing the pencil-head-shaped reaction force cone at the main insulating end part of the cable (1) by 400-mesh 600-mesh abrasive paper to be smooth without edges, fins and burrs; s1.4, before the wire cores (5) of the cables (1) of each phase of the cable are connected, sleeving a copper mesh sleeve (14) and a cold-shrink tube (2); s1.5, exposing two wire cores (5) of a pair of cables (1) to be butted to a conductor part for oxidation layer treatment, polishing and cleaning, sleeving a cleaned connecting pipe (4) into the conductor end parts of the two wire cores (5) to be butted, symmetrically crimping from the middle to two sides, and polishing the crimping surface to smooth and burr-free.
8. The process for manufacturing the self-melting insulating tape lapping intermediate joint as claimed in claim 7, wherein: the specific step of S2: the inner semi-conducting layer (3) of the cable (1) at one end of the connecting pipe (4) is completed through crimping treatment, the semi-conducting belt is used for half-overlapping and overlapping with 1/2 belt width, the cable (1) at the other end is wrapped to the inner semi-conducting layer (3) of the cable (1) along the surface of the connecting pipe (4), and the cable is tightly overlapped with the inner semi-conducting layer (3) of the cable (1) to form a connector round inner semi-conducting belt layer (12).
9. The manufacturing process of the self-melting insulating tape lapping intermediate joint as claimed in claim 1, characterized in that: the specific step of step S4: binding the phase cable joints together by using a waterproof adhesive tape, and recovering the inner sheath to form a cable joint; the cable armor layers exposed out of the cable outer sheath fracture positions on the two sides of the cable joint are communicated through copper braided wires, the two ends of each copper braided wire are fixed on the cable armor layers on the two sides through constant-force springs (11), and then the constant-force springs (11) on the two sides are firmly wrapped through adhesive tapes to form a cable metal shielding tape; polishing the cable outer sheaths on the two sides of the cable joint, and overlapping and wrapping a waterproof belt from the cable outer sheath on one side of the cable joint to the cable outer sheath on the other side to form a cable waterproof layer; and the cable armor layer is formed by wrapping the armor belt outside the cable waterproof layer in a semi-lap joint manner.
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| CN202110825391.0A CN113555840B (en) | 2021-07-21 | 2021-07-21 | Manufacturing process of self-melting insulating tape wrapping intermediate joint |
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| CN202110825391.0A CN113555840B (en) | 2021-07-21 | 2021-07-21 | Manufacturing process of self-melting insulating tape wrapping intermediate joint |
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| CN113555840B CN113555840B (en) | 2023-01-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114347453A (en) * | 2021-12-08 | 2022-04-15 | 江苏亨通高压海缆有限公司 | High-voltage cable molding type joint interface processing method |
| CN115165734A (en) * | 2022-08-12 | 2022-10-11 | 山东七星电气科技发展有限公司 | Simulation test method and device for adhesion degree of insulating strip interface |
| CN117240018A (en) * | 2023-11-14 | 2023-12-15 | 天津普友机电设备股份有限公司 | Joint process of stator winding wire and power cable of submersible motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4450318A (en) * | 1981-09-29 | 1984-05-22 | Siemens-Allis, Inc. | Means and method for providing insulation splice |
| CN101752938A (en) * | 2010-02-02 | 2010-06-23 | 山西天波制泵有限公司 | Joint protective structure of deep diving electric pump cable and making method thereof |
| CN109616962A (en) * | 2018-12-21 | 2019-04-12 | 吴江市华鼎热缩制品有限公司 | A kind of hot melten type cable centre connection mounting process |
| CN111092395A (en) * | 2019-12-26 | 2020-05-01 | 杭州矽能新材料有限公司 | Fusion type cold-shrink intermediate joint and installation method of cold-shrink terminal |
-
2021
- 2021-07-21 CN CN202110825391.0A patent/CN113555840B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4450318A (en) * | 1981-09-29 | 1984-05-22 | Siemens-Allis, Inc. | Means and method for providing insulation splice |
| CN101752938A (en) * | 2010-02-02 | 2010-06-23 | 山西天波制泵有限公司 | Joint protective structure of deep diving electric pump cable and making method thereof |
| CN109616962A (en) * | 2018-12-21 | 2019-04-12 | 吴江市华鼎热缩制品有限公司 | A kind of hot melten type cable centre connection mounting process |
| CN111092395A (en) * | 2019-12-26 | 2020-05-01 | 杭州矽能新材料有限公司 | Fusion type cold-shrink intermediate joint and installation method of cold-shrink terminal |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114347453A (en) * | 2021-12-08 | 2022-04-15 | 江苏亨通高压海缆有限公司 | High-voltage cable molding type joint interface processing method |
| CN115165734A (en) * | 2022-08-12 | 2022-10-11 | 山东七星电气科技发展有限公司 | Simulation test method and device for adhesion degree of insulating strip interface |
| CN117240018A (en) * | 2023-11-14 | 2023-12-15 | 天津普友机电设备股份有限公司 | Joint process of stator winding wire and power cable of submersible motor |
| CN117240018B (en) * | 2023-11-14 | 2024-03-08 | 天津普友机电设备股份有限公司 | Joint process of stator winding wire and power cable of submersible motor |
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| CN113555840B (en) | 2023-01-13 |
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