CN115133467A - Manufacturing process of extra-high voltage direct current 800kV cable wrapping fusion type soft joint - Google Patents
Manufacturing process of extra-high voltage direct current 800kV cable wrapping fusion type soft joint Download PDFInfo
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- CN115133467A CN115133467A CN202210747904.5A CN202210747904A CN115133467A CN 115133467 A CN115133467 A CN 115133467A CN 202210747904 A CN202210747904 A CN 202210747904A CN 115133467 A CN115133467 A CN 115133467A
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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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- 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
- H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
- H02G1/1285—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by friction, e.g. abrading, grinding, brushing
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Abstract
The invention discloses a manufacturing process of an extra-high voltage direct current 800kV cable lapping fused type soft joint, which comprises the following steps: a. cable pretreatment; b. recovering the conductor, and welding conductor wire cores of the two sections of high-voltage cables together by welding; c. heating and straightening the cable; d. manufacturing a reaction force cone; e. recovering the inner shielding layer; f. recovering the insulating layer; g. recovering the outer shielding layer; h. degassing the cable, and after the outer shielding layer is recovered, coating and sealing the joint of the cable to perform degassing operation; i. and recovering the metal shielding layer, uniformly wrapping the semi-conductive water-blocking tape on the outer layer of the outer shielding layer after the degassing work is finished, and then covering the metal shielding sleeve on the cable body for welding recovery. The invention provides a manufacturing process of a lapped and fused soft joint of an extra-high voltage direct current 800kV cable, which is simple in structure, perfect, convenient and high in recovery degree.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a manufacturing process of a lapped and fused soft joint of an extra-high voltage direct current 800kV cable.
Background
The cable is a bridge between the power supply equipment and the electric equipment, plays a role in power transmission and is widely applied. Modern life and production cannot be isolated from electric power, and therefore, cables cannot be isolated. With the widespread use of cables, the number of required cable accessories is increased and the quality is also increased. With the rapid development of the wind power industry, power transmission is more and more frequent, correspondingly, in order to reduce unnecessary loss during power transmission, the cable grade is more and more developed, the advantage of an ultrahigh-voltage grade direct-current cable in transmission is very obvious, the transmission distance is long, the loss is low, direct current can be converted into alternating current through a transformer station to be used by household users, but when the cable breaks down or is laid, two or more sections of cables are required to be connected, and conductor wire cores of the cables are communicated to form a continuous cable. However, the extra-high voltage cable has a large current-carrying capacity, so that the requirement on the quality of the joint is high, the joint is difficult to recover, and the joint cannot bear high voltage easily.
Disclosure of Invention
Aiming at the defects of the prior art, the manufacturing process of the extra-high voltage direct current 800kV cable lapping fusion type soft joint is provided, and is simple in structure, perfect, convenient and high in recovery degree.
In order to achieve the above object, the present invention provides the following technical solutions.
A manufacturing process of an extra-high voltage direct current 800kV cable lapping fused soft joint comprises the following steps:
a. cable pretreatment, wherein the end parts of two sections of cables are stripped, so that conductor cores are exposed;
b. recovering the conductor, and welding conductor wire cores of the two sections of high-voltage cables together by welding;
c. heating and straightening the cable, namely heating the end parts of the two sections of the cable, removing the stress in the cable, and straightening the end part of the cable to ensure that the end part of the cable is not bent after being naturally cooled;
d. manufacturing a reaction force cone, namely manufacturing the end parts of the insulating layers of the two sections of cables into the reaction force cone, then processing the surface of the reaction force cone to be smooth, and then polishing the surface of the reaction force cone;
e. recovering the inner shielding layer, namely manufacturing an inner shielding sleeve, uniformly wrapping semi-conductive nylon cloth outside a conductor wire core at a joint, longitudinally wrapping the inner shielding sleeve outside the semi-conductive nylon cloth, wherein the material of the inner shielding sleeve is the same as that of the inner shielding layer in the cable, and then heating, melting and molding the inner shielding sleeve;
f. after the insulation layer recovers, the conductor shield recovers, the insulation tape is uniformly wrapped outside the inner shielding layer, and the insulation tape is heated, melted and molded;
g. recovering the outer shielding layer, firstly manufacturing an outer shielding sleeve, longitudinally wrapping the outer shielding sleeve outside the insulating layer, wherein the material of the outer shielding sleeve is the same as that of the outer shielding layer in the cable, and then heating, melting and molding the outer shielding sleeve;
h. degassing the cable, and after the outer shielding layer is recovered, coating and sealing the joint of the cable to perform degassing operation;
i. and recovering the metal shielding layer, uniformly wrapping the semi-conductive water-blocking tape on the outer layer of the outer shielding layer after the degassing work is finished, and then covering the metal shielding sleeve on the cable body for welding recovery.
The invention has the beneficial effects that: the manufacturing process of the invention comprises the steps of manufacturing the same material of an inner shielding layer in a cable body to form an inner shielding sleeve, heating, melting and forming an inner shielding strip to recover the inner shielding layer, reducing gaps and air holes of the inner shielding layer, heating, melting and forming an insulating tape to recover an insulating layer, manufacturing the same material of an outer shielding layer in the cable body to form an outer shielding sleeve, longitudinally coating the outer shielding sleeve, heating, melting and forming to recover the outer shielding layer, reducing gaps and air holes of the outer shielding layer, manufacturing the same material of the metal shielding layer in the cable body to form a metal shielding sleeve, and manually longitudinally wrapping the metal shielding sleeve outside a conductor, so that the characteristics of the body are closest to each other, the metal shielding sleeve can meet the emergency repair recovery of an 800kv direct current cable, and finally, the degassing effect is added, compared with the recovery mode of a mold in the prior art, this application directly twines heating element and heats, has cancelled the mould structure, and processing is simple, can directly carry out the operation in the open air.
As an improvement of the invention, in the step b, after the conductor is recovered, the conductor is firstly polished by sand paper, and then the conductor is polished by a polishing machine; in the step e, after the inner shielding layer is recovered, firstly, the inner shielding layer is polished by sand paper, and then the inner shielding layer is polished by a polishing machine; in the step f, after the insulating layer is recovered, firstly, the insulating layer is polished by abrasive paper, and then the insulating layer is polished by a polishing machine; in the step g, after the outer shielding layer is recovered, firstly, polishing the outer shielding layer by using sand paper, and then, polishing the outer shielding layer by using a polishing machine; in step g, after the outer shielding layer is recovered, the outer shielding layer is polished by sand paper and then polished by a polishing machine.
As an improvement of the invention, in the steps b, e, f and g, the grinding process is firstly carried out by 320-mesh sand paper, then is carried out by 600-mesh sand paper and finally is carried out by 2000-mesh sand paper.
In the step b, the conductors are welded by using a turnover V-shaped port welding mode, each layer of the two conductors is turned outwards, the two conductors are recovered after the internal water-blocking mesh belt is removed, the end parts of the two conductors are respectively beveled, the end parts of the two conductors are aligned to form a V-shaped port, and then the port is welded.
As a refinement of the invention, in step c the ratio between the length of the reaction force cone and the thickness of the insulation layer at the cable end is between 10 and 15.
As an improvement of the invention, in the step c, the cable body water-blocking tape is firstly wound on the metal sheath edge at the end part of the cable again, the tightness is uniform, then the heating blanket is uniformly wound on the cable, and when the environmental temperature is lower than the threshold value, a layer of tinfoil needs to be uniformly wound on the outer part of the heating blanket for heat preservation.
In step g, the outer shielding sleeve is longitudinally wrapped outside the insulating layer, two ends of the outer shielding sleeve are overlapped with the outer shielding layer of the cable, then the tetrafluoro belt and the high-temperature belt are wound, and the asbestos heating belt and the tinfoil are used for uniformly wrapping and heating.
In the step f, the insulating tape is wound in a mode of firstly winding the middle and then winding the two sides, the insulating tape gradually climbs upwards along the slope of the reaction force cone, the gap of the insulating tape which is heated and retracted is reduced, the winding thickness is larger than that of the body, and then rubber pads with the same thickness are arranged on the two ends of the winding insulation.
In the step f, after the insulating tape is wrapped, the outer layer is wrapped with the tetrafluoro tape and the high-temperature tape, the insulating tape and the tinfoil are uniformly wrapped and heated by using the asbestos heating tape and the tinfoil, high-frequency heating is adopted while the heating tape is used for heating, and the high-frequency heating is utilized to generate induced current to improve the temperature of the copper conductor by driving the temperature sensing effect of the inner conductor, so that heat is generated from inside to outside, and the insulating tape is fully heated.
In step e, step f, and step g, temperature detection is performed by thermocouples during heating, and the number of thermocouples is two or more.
As an improvement of the invention, in the step h, the cable is degassed through a degassing box, the degassing box comprises a box body formed by buckling an upper shell and a lower shell, a wire inlet hole arranged at one side of the box body, a wire outlet hole arranged at the other side of the box body and a gas outlet hole arranged above the box body, the cable passes through the box body through the wire inlet hole and the wire outlet hole, the joint of the cable is positioned in the box body, a plurality of light-emitting heating pipes distributed on the periphery of the cable are arranged in the box body, the cable joint is heated through the light-emitting heating pipes, and the gas is exhausted through a gas outlet.
In step i, uniformly wrapping a layer of semi-conductive water-blocking tape outside the insulating shield, moving the metal shielding sleeve sleeved into the cable in advance to the metal shielding layer of the cable body, overlapping, welding the edge of the metal shielding sleeve with the metal shielding layer of the cable by using a high-temperature spray gun, and filling up the welding point by using a waterproof tape after the completion.
Drawings
Fig. 1 is a schematic structural view of the cable of the present invention.
FIG. 2 is a schematic view of the deaerator tank structure of the present invention.
FIG. 3 is another angle schematic of the degassing tank of the present invention.
In the figure, 1, a cable; 11. a conductor; 12. an inner shield layer; 13. an insulating layer; 14. an outer shield layer; 15. a metal shielding layer; 2. a degassing tank; 21. a box body; 21. a wire inlet hole; 22. a wire outlet hole; 23. and an air outlet.
Detailed Description
The invention is further explained with reference to the drawings.
Referring to fig. 1, a manufacturing process of a lapped fused soft joint of an extra-high voltage direct current 800kV cable 1 is characterized in that: the method comprises the following steps:
a. and (3) pretreating the cable 1, fixing the end parts of the two sections of cables 1, and stripping the nonmetal outer sheath and the metal sheath at the end parts of the two sections of cables 1 by using a rotary cutter so as to expose the wire core of the conductor 11.
b. The conductors 11 are recovered, the conductor 11 wire cores of the two sections of high-voltage cables 1 are welded together by welding, specifically, the conductors 11 are welded by using a turning V-shaped port welding mode, each layer of the two conductors 11 is turned outwards, after the internal water-blocking mesh belt is removed, restoring according to the original intercept of the conductors 11, respectively bevelling the ends of the two conductors 11, aligning the end parts of the two conductors 11 to form a V-shaped opening, welding the opening, connecting the wire cores of the two conductors 11 together in a butt joint manner by adopting an argon arc welding method, then polishing the welding point and the periphery of the conductor 11 by using sand paper, and in the polishing process, polishing through 320-mesh abrasive paper, then polishing through 600-mesh abrasive paper, finally polishing through 2000-mesh abrasive paper, and then polishing the welding point and the periphery of the conductor 11 through a polishing machine after polishing; so that the welding point of the conductor 11 is smooth and burr-free, and it is necessary to ensure that the polished part is enlarged by 40 times and has no mark after polishing.
c. Heating and straightening the cable 1, namely heating the end parts of two sections of the cable 1, removing the stress in the end part of the cable 1, and straightening the end part of the cable 1 to ensure that the end part of the cable 1 is not bent after being naturally cooled; specifically, the end water blocking tape of the cable 1 is firstly wound on the edge of the metal sheath again, the tightness is uniform, then the heating blanket is uniformly wound on the end of the cable 1 to be heated, the stress in the end of the cable 1 is removed, and then the end of the cable 1 is fixed by using a sizing iron, so that the end of the cable 1 is not bent after being naturally cooled. When the ambient temperature is too low, a layer of tinfoil needs to be uniformly wrapped outside the heating blanket for heat preservation.
d. And (2) manufacturing a reaction force cone, namely manufacturing insulation into a pencil-head-shaped reaction force cone by using a special wire stripping cutter for the cable 1 according to the process size, then performing rough machining on the insulation surface by using a glass cutter to smooth the insulation surface, and then performing polishing treatment on the insulation surface and the shielding surface by using a special polishing machine, wherein the ratio of the length of the reaction force cone to the insulation thickness is 10-15 so as to reduce the subsequent wrapping difficulty and avoid the generation of gaps and air holes.
e. The inner shielding layer 12 is recovered, an inner shielding sleeve with matched size is firstly manufactured, then the semi-conductive nylon cloth is evenly wrapped outside a conductor core of the conductor 11 manually, then the inner shielding sleeve is longitudinally wrapped outside the semi-conductive nylon cloth, wherein the material of the inner shielding sleeve is the same as that of the inner shielding layer 12 in the cable 1, after the inner shielding sleeve is wrapped, a polytetrafluoroethylene tape and a copper tape are evenly wound on the outer layer, two heating couples are arranged outside the copper tape for sensing the heating temperature, the heating is stopped when the temperature of the heating couples reaches a set temperature, then the heating tape is wrapped, a layer of tinfoil is respectively wrapped inside and outside the heating tape to enable the shielding of the conductor 11 to be evenly heated, the inner shielding sleeve is heated and melted and formed by heating equipment, a switch is disconnected after heating for a period of time, the heating tape is dismantled and begins to be cooled, polishing treatment is carried out after the shielding of the conductor 11 is cooled, then the welding point and the periphery of the conductor 11 are polished by abrasive paper, in the grinding process, grinding is carried out through 320-mesh abrasive paper, then grinding is carried out through 600-mesh abrasive paper, finally grinding is carried out through 2000-mesh abrasive paper, and after grinding is finished, super-smooth polishing treatment is carried out on the surface of the inner shielding layer 12 through a polishing machine; the surface of the inner shielding layer 12 is smooth and burr-free, and it is necessary to ensure that after polishing is completed, the polished part is enlarged by 40 times and has no mark. And through the preparation inner shield cover, adopt the mode of vertical cladding to carry out the recovery of inner shield layer 12, can reduce clearance and gas pocket.
f. Insulating layer 13 resumes, internal shield layer 12 resumes the back, and the manual work evenly winds the insulating tape around the package outside internal shield layer 12, and the insulating tape adopts the mode on both sides again in the centre earlier around the package, and progressively climbs up along reaction force awl slope, reduces the clearance that the insulating tape was heated and contracts back, is greater than the body around package thickness, then is stacking up the rubber pad of the same thickness around package insulation both ends, withstands the too high insulation of thickness, prevents to spread to both sides because of tension is too big around the package insulation. The flow direction after can effectively fixed insulating heating prevents that insulating from flowing to both ends because of the heating, keeps insulating internal tension simultaneously, reduces insulating intramolecular gap. Meanwhile, the convenience degree of the wrapping of the PTFE tape and the high-temperature tape is improved by the silica gel pad, the silica gel pad makes up the defect of too low insulation shielding, the wrapping is more convenient and more uniform, the insulation tape adopts a cross-linked polyethylene insulation tape, the PTFE tape and the high-temperature tape are uniformly wound on the outer layer, the PTFE tape can be prevented from overflowing during insulation melting, two heating couples are arranged outside the high-temperature tape for sensing the heating temperature, the heating is stopped when the temperature of the heating couples reaches a set temperature, then the heating tape is wrapped, the heating tape is wrapped with a layer of tinfoil respectively, so that the conductive insulation can be heated uniformly, the inner shielding sleeve is heated and melted and formed by heating equipment, a switch is disconnected after heating for a period of time, the heating tape is removed for cooling, high-frequency heating is adopted while the heating tape is used for heating, corresponding high-frequency heating data are set, and the working principle of high frequency is utilized, through the temperature sensing effect that drives inside conductor 11 sinle silk, produce induced-current and improve the temperature of conductor 11, from this from inside to outside production of heat for resume insulating time that reaches the assigned temperature, promoted the heating effect that resumes insulating simultaneously, make insulating obtain the intensive heating.
After the insulating layer 13 is cooled, polishing the insulating layer 13 by using 320-mesh abrasive paper, then polishing by using 600-mesh abrasive paper, and finally polishing by using 2000-mesh abrasive paper, and then performing ultra-smooth polishing on the surface of the insulating layer 13 by using a polishing machine; the surface of the insulating layer 13 is smooth and burr-free, and it is necessary to ensure that after polishing is completed, the polished part is enlarged by 40 times without mark.
In addition, insulating layer 13 is worked in the clean bench, be equipped with the dehumidifier that is used for adjusting humidity in the clean bench, an air conditioner for temperature regulation, a clarifier for air-purifying, resume through insulating layer 13 in the clean bench, and adjust humidity through the dehumidifier, adjust the temperature through the air conditioner, air-purifying through the clarifier, thereby effectively reduce the insulating tape when twining, impurity and steam in the air, thereby guarantee insulating layer 13 stability of operation after resumeing, reduce the fault rate of puncture, after insulating winding is accomplished, need to stack up the rubber pad of same thickness on insulating both sides, the rubber pad can make too thick insulating unable normal both ends outflow, can keep insulating inside tension simultaneously, the rubber pad is even the cladding at cable 1 insulation shielding outer, fix together with tetrafluoro area and recovery insulation.
g. The outer shielding layer 14 is recovered, firstly, an outer shielding sleeve with matched size is manufactured, then the outer shielding sleeve is arranged outside the insulating layer 13, wherein the material of the outer shielding sleeve is the same as that of the outer shielding layer 14 in the cable 1, the outer shielding sleeve is covered outside the insulating layer 13 in a longitudinal covering mode, two ends of the outer shielding sleeve are lapped with the outer shielding layer 14 of the cable 1, two ends of the outer shielding sleeve are aligned and uniformly covered in a longitudinal covering mode, a polytetrafluoroethylene tape and a high-temperature tape are uniformly wound on the outer layer, two heating couples are arranged outside the high-temperature tape for sensing heating temperature, when the temperature of the heating couples reaches a set temperature, the temperature is stopped to be raised, then asbestos heating tapes are covered, a layer of tinfoil is respectively covered inside and outside the heating tapes, so that the outer shielding sleeve can be uniformly heated, the outer shielding sleeve is heated and melted to be molded by using heating equipment, the outer shielding layer 14 is formed after the outer shielding sleeve is cooled, then polishing treatment is carried out, and in the polishing process, firstly, grinding through 320-mesh abrasive paper, then grinding through 600-mesh abrasive paper, and finally grinding through 2000-mesh abrasive paper, and then performing ultra-smooth polishing treatment on the surface of the outer shielding layer 14 through a polishing machine after the grinding treatment is finished; the surface of the outer shield layer 14 is smooth and burr-free, and it is necessary to ensure that no mark is formed after the polishing is finished and the polished part is enlarged by 40 times. And the outer shielding layer 14 is recovered by manufacturing the outer shielding sleeve and adopting a longitudinal coating mode, so that gaps and air holes can be reduced.
h. Degassing the cable 1, and after the insulation shielding is recovered, coating and sealing the joint to perform degassing operation; specifically, referring to fig. 2 to 3, the cable 1 is degassed by the degassing tank 2, the degassing tank 2 includes a tank 21 formed by fastening an upper shell and a lower shell, a wire inlet 21 disposed at one side of the tank 21, a wire outlet 22 disposed at the other side of the tank 21, and a gas outlet 23 disposed above the tank 21, the cable 1 passes through the tank 21 through the wire inlet 21 and the wire outlet 22, so that the connection point of the cable 1 is located in the tank 21, degassing treatment is carried out on the joint of the cable 1 through the air outlet hole 23, rubber pads are arranged at the wire inlet hole 21 and the wire outlet hole 22, thereby leading the sealing effect in the box body 21 to be better, a plurality of luminous heating pipes distributed on the periphery of the cable 1 are arranged in the box body 21, the cable 1 joint is heated through the luminous heating pipe, so that the heating is uniform, the degassing speed is high, and finally, the air is exhausted through the air outlet.
i. The metal shielding layer 15 is recovered, the semi-conductive water-blocking tape is uniformly wrapped on the outer layer of the outer shielding layer 14, the semi-overlapping mode is adopted for uniform and smooth wrapping, then the metal shielding sleeve sleeved in advance is moved to the metal shielding layer 15 of the cable 1, two ends of the metal shielding sleeve are processed into a slope to be connected with the metal shielding layer 15 of the cable 1, then the metal shielding sleeve and the metal shielding layer 15 of the cable 1 are welded together by using a welding gun, both ends of the metal shielding sleeve are all operated in the same way, after the welding is finished, the welding point is wrapped and filled by using a waterproof tape, then the outer sheath prepared in advance is moved to the middle of a joint, the outer sheath is heated by using a thermal spraying gun to be quickly shrunk, and the repairing is finished.
The manufacturing process of the invention comprises the steps of manufacturing an inner shielding sleeve by the same material of an inner shielding layer 12 in a cable 1 body, heating, melting and molding an inner shielding strip, recovering the inner shielding layer 12, reducing gaps and air holes of the inner shielding layer 12, heating, melting and molding an insulating tape by the heating of the insulating tape, recovering an insulating layer 13, manufacturing an outer shielding sleeve by the same material of an outer shielding layer 14 in the cable 1 body, longitudinally coating the outer shielding sleeve, heating, melting and molding, recovering the outer shielding layer 14, reducing gaps and air holes of the outer shielding layer 14, manufacturing a metal shielding sleeve by the same material of a metal shielding layer 15 in the cable 1 body, longitudinally coating the metal shielding sleeve outside a conductor 11 manually, and adding a degassing effect, compared with the mode of recovering by a mold in the prior art, the heating method of the invention directly winds a heating element for heating, the mould structure has been cancelled, the processing is simple, can directly carry out the operation in the open air, and manual mode around the package, make the laminating between insulating tape and the internal shield layer 12 inseparable, can eliminate the micropore, thereby can be the body characteristic closest, the performance is good, and conductor 11, internal shield layer 12, insulating layer 13, external shield layer 14 are after recovering, all through polishing and polishing treatment many times, can make the characteristic of joint department and cable 1 body more close, make the final joint department of cable 1 can satisfy special high voltage 800 kv's current-carrying.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (10)
1. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint is characterized by comprising the following steps of: the method comprises the following steps:
a. cable pretreatment, wherein the end parts of the two sections of cables are stripped, so that the conductor core is exposed;
b. the conductor is recovered, and conductor wire cores of the two sections of high-voltage cables are welded together through welding;
c. heating and straightening the cable, namely heating the end parts of the two sections of the cable, removing the stress in the cable, and straightening the end part of the cable to ensure that the end part of the cable is not bent after being naturally cooled;
d. manufacturing a reaction force cone, namely manufacturing the end parts of the insulating layers of the two sections of cables into the reaction force cone;
e. recovering the inner shielding layer, namely manufacturing an inner shielding sleeve, uniformly wrapping semi-conductive nylon cloth outside a conductor wire core at a joint, longitudinally wrapping the inner shielding sleeve outside the semi-conductive nylon cloth, wherein the material of the inner shielding sleeve is the same as that of the inner shielding layer in the cable, and then heating, melting and molding the inner shielding sleeve;
f. after the insulation layer is recovered, the conductor shielding is recovered, the insulation tape is uniformly wrapped outside the inner shielding layer, and the insulation tape is heated, melted and molded;
g. the outer shielding layer is recovered, firstly, an outer shielding sleeve is manufactured, then the outer shielding sleeve is longitudinally covered outside the insulating layer, wherein the material of the outer shielding sleeve is the same as that of the outer shielding layer in the cable, and then the outer shielding sleeve is heated, melted and molded;
h. degassing the cable, and after the outer shielding layer is recovered, coating and sealing the joint of the cable to perform degassing operation;
i. and recovering the metal shielding layer, uniformly wrapping the semi-conductive water-blocking tape on the outer layer of the outer shielding layer after the degassing work is finished, and then covering the metal shielding sleeve on the cable body for welding recovery.
2. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 1, characterized in that: in the step b, after the conductor is recovered, firstly, the conductor is polished by abrasive paper, and then the conductor is polished by a polishing machine; in the step e, after the inner shielding layer is recovered, firstly, the inner shielding layer is polished by abrasive paper, and then, the inner shielding layer is polished by a polishing machine; in the step f, after the insulating layer is recovered, firstly, the insulating layer is polished by abrasive paper, and then the insulating layer is polished by a polishing machine; in the step g, after the outer shielding layer is recovered, firstly polishing the outer shielding layer through sand paper, and then polishing the outer shielding layer through a polishing machine; in step g, after the outer shielding layer is recovered, the outer shielding layer is polished by sand paper and then polished by a polishing machine.
3. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 2, characterized in that: in the steps b, e, f and g, the polishing process is performed by 320-mesh abrasive paper, then 600-mesh abrasive paper and finally 2000-mesh abrasive paper.
4. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 1, characterized in that: in the step b, the conductors are welded in a mode of turning V-shaped openings, each layer of the two conductors is turned outwards, the two conductors are recovered after the internal water-blocking mesh belt is removed, the end parts of the two conductors are respectively subjected to beveling treatment, the end parts of the two conductors are aligned to form V-shaped openings, and then the openings are welded.
5. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 1, characterized in that: in step c, the ratio between the length of the reaction force cone and the thickness of the insulation layer at the end of the cable is between 10 and 15.
6. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 1, characterized in that: and step g, longitudinally wrapping an outer shielding sleeve outside the insulating layer, overlapping two ends of the outer shielding sleeve with the outer shielding layer of the cable, winding a tetrafluoro belt and a high-temperature belt, and uniformly wrapping and heating by using an asbestos heating belt and tinfoil.
7. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 1, characterized in that: in the step f, the insulating tape wrapping mode is that firstly the middle of the insulating tape is wrapped and then the insulating tape gradually climbs upwards along the reaction force cone slope, the gap of the insulating tape which retracts when heated is reduced, the wrapping thickness is larger than that of the body, and then rubber pads with the same thickness are arranged at the two ends of the wrapping insulation.
8. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 1, characterized in that: in the step f, after the insulating tape is wrapped, the outer layer is wrapped with the polytetrafluoroethylene tape and the high-temperature tape, the asbestos heating tape and the tinfoil paper are used for uniformly wrapping and heating, high-frequency heating is adopted while the heating tape is used for heating, and by utilizing the high-frequency heating, through the temperature sensing effect of the inner conductor, induced current is generated to increase the temperature of the copper conductor, and heat is generated from inside to outside, so that the insulating tape is fully heated.
9. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 1, characterized in that: in step h, the cable carries out the degasification through the degasification case, and the degasification case includes the box that is formed by epitheca and inferior valve lock, sets up in the entrance hole of box one side, sets up in the wire hole of box opposite side and sets up in the venthole of box top, and the cable passes the box through entrance hole and wire hole to make the junction of cable be located the box, be equipped with a plurality of in the box and distribute in the luminous heating pipe of cable periphery, heat cable joint through luminous heating pipe, and exhaust through the gas outlet.
10. The manufacturing process of the extra-high voltage direct current 800kV cable lapping fused soft joint according to claim 1, characterized in that: in the step i, a layer of semi-conductive water-blocking tape is uniformly wrapped outside the insulating shielding layer, then the metal shielding sleeve sleeved into the cable in advance is moved to the metal shielding layer of the cable body and is lapped, the edge of the metal shielding sleeve is welded with the metal shielding layer of the cable by using a high-temperature spray gun, and the welding point is filled and leveled by using a waterproof tape after the welding is finished.
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| CN202210747904.5A CN115133467A (en) | 2022-06-29 | 2022-06-29 | Manufacturing process of extra-high voltage direct current 800kV cable wrapping fusion type soft joint |
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| CN202210747904.5A CN115133467A (en) | 2022-06-29 | 2022-06-29 | Manufacturing process of extra-high voltage direct current 800kV cable wrapping fusion type soft joint |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116092745A (en) * | 2023-01-30 | 2023-05-09 | 江苏亨通高压海缆有限公司 | Recovery method for insulating shielding of power cable |
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| CN117595188A (en) * | 2024-01-19 | 2024-02-23 | 哈尔滨理工大学 | Directional heating high-voltage submarine cable soft joint crosslinking system and application method thereof |
| CN117595188B (en) * | 2024-01-19 | 2024-04-02 | 哈尔滨理工大学 | Directional heating high-voltage submarine cable soft joint crosslinking system and application method thereof |
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