CN115149469B - Manufacturing process of ultrahigh-voltage direct-current 525kV lapped fusion type soft joint - Google Patents
Manufacturing process of ultrahigh-voltage direct-current 525kV lapped fusion type soft joint Download PDFInfo
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- CN115149469B CN115149469B CN202210748244.2A CN202210748244A CN115149469B CN 115149469 B CN115149469 B CN 115149469B CN 202210748244 A CN202210748244 A CN 202210748244A CN 115149469 B CN115149469 B CN 115149469B
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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
- H02G1/145—Moulds
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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
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
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Abstract
The invention discloses a manufacturing process of an ultrahigh-voltage direct-current 525kV lapped fusion type soft joint, which comprises the following steps of: a. pretreating a cable; b. recovering the conductor; c. heating and straightening a cable, manufacturing a reaction force cone, recovering an inner shielding layer, uniformly wrapping semiconductive nylon cloth outside a conductor core at a joint, longitudinally wrapping an inner shielding sleeve outside the semiconductive nylon cloth, and heating, melting and forming the inner shielding sleeve; f. after the insulation layer is restored, the inner shielding layer is restored, and the insulation belt is uniformly wrapped outside the inner shielding layer; g. recovering the outer shielding layer, longitudinally coating the outer shielding sleeve outside the insulating band, and heating to enable the insulating band and the outer shielding sleeve to be simultaneously formed in a melting mode; h. and recovering the metal shielding layer, and then covering the metal shielding sleeve on the cable body for welding recovery. The invention provides a manufacturing process of an ultrahigh-voltage direct-current 525kV lapped fusion type soft joint, which can ensure the performance of the joint, can bear 525kV current and can shorten recovery time.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a manufacturing process of an ultrahigh-voltage direct-current 525kV lapped fusion type soft joint.
Background
The cable is a bridge between the power supply equipment and the electric equipment, plays a role in transmitting power and has wide application. Modern life and production are not separated from power, and therefore, from cables. With the widespread use of cables, the number of cable accessories required is also increasing, as is the quality.
With the rapid development of the wind power industry, the power transmission is more and more frequent, the cable grade is more and more developed correspondingly to reduce unnecessary loss in the power transmission, the advantage of the ultra-high voltage grade direct current cable in transmission is very obvious, the transmission distance is long, the loss is low, and the direct current can be converted into alternating current through a transformer station for the use of household users, but when the cable fails or in the laying process, two or more sections of cables are needed, and the conductor cores of the cables are communicated through connection to form a continuous cable. However, the ultrahigh voltage cable has high current carrying capacity, so that the quality requirement on the joint is high, the recovery difficulty of the joint is high, and the recovery time is long, so that a manufacturing process is urgently needed, the performance of the joint can be ensured, the cable rush-repair time can be shortened, and the loss caused by power failure can be reduced as much as possible.
Disclosure of Invention
Aiming at the defects and defects of the prior art, the manufacturing process of the ultrahigh-voltage direct-current 525kV lapped fusion type soft joint is provided, so that the performance of the joint can be ensured, the 525kV current can be borne, and the recovery time can be shortened.
In order to achieve the above object, the present invention provides the following technical solutions.
A manufacturing process of an ultrahigh-voltage direct-current 525kV lapped fusion type soft joint comprises the following steps:
a. the cable pretreatment, namely stripping the end parts of the two sections of cables to expose the conductor cores;
b. restoring the conductor, and welding conductor cores of the two sections of high-voltage cables together by welding;
c. heating and straightening the cable, heating the end parts of the two sections of cables, removing the stress in the cables, straightening the end parts of the cables, and ensuring that the end parts of the cables are not bent after being cooled;
d. the manufacturing of a reaction force cone, namely, the end parts of insulating layers of the cables at two ends are made into the reaction force cone;
e. the inner shielding layer is restored, an inner shielding sleeve is manufactured firstly, semiconductive nylon cloth is uniformly wrapped outside a conductor core at a joint, then the inner shielding sleeve is longitudinally wrapped outside the semiconductive nylon cloth, the material of the inner shielding sleeve is the same as that of the inner shielding layer in the cable, and then the inner shielding sleeve is heated, melted and molded;
f. after the insulation layer is restored, the inner shielding layer is restored, and the insulation belt is uniformly wrapped outside the inner shielding layer;
g. the outer shielding layer is recovered, an outer shielding sleeve is firstly manufactured, then the outer shielding sleeve is longitudinally coated outside the insulating band, the material of the outer shielding sleeve is the same as that of the outer shielding layer in the cable, and then heating is carried out, so that the insulating band and the outer shielding sleeve are formed in a melting mode at the same time, an insulating layer is formed after the insulating band is formed in a melting mode, and the outer shielding layer is formed after the outer shielding sleeve is formed in a melting mode;
h. and recovering the metal shielding layer, uniformly wrapping the semiconductive water blocking tape on the outer layer of the outer shielding layer, and then covering the metal shielding sleeve on the cable body for welding recovery.
The beneficial effects of the invention are as follows: the manufacturing process of the invention comprises the steps of manufacturing the same material of the inner shielding layer in the cable body to form an inner shielding sleeve, heating and melting and forming the inner shielding strip to recover the inner shielding layer, reducing the gap and air holes of the inner shielding layer, heating and melting and forming the insulating belt by heating the insulating belt to recover the insulating layer, manufacturing the same material of the outer shielding layer in the cable body to form an outer shielding sleeve, longitudinally cladding the outer shielding sleeve, heating and melting and forming the outer shielding sleeve to recover the outer shielding layer, reducing the gap and air holes of the outer shielding layer, finally manufacturing the same material of the metal shielding layer in the cable body to form the metal shielding sleeve, manually longitudinally cladding the metal shielding sleeve outside the conductor, and ensuring that the characteristics of the body are closest, so that the cable can meet the urgent repair recovery of the ultra-high voltage direct current 525kV direct current cable, and simultaneously heating and melting and forming the insulating belt and the outer shielding sleeve, thereby shortening recovery time and reducing loss caused by power failure as much as possible.
In the step b, each layer of conductors of the two-section cable is turned outwards, the inner water-blocking net belt is removed, the ends of the two conductors are subjected to flat cutting treatment and then beveling treatment respectively, the ends of the two conductors are butted, the flat cutting positions of the ends of the two conductors are attached, the cutting positions are welded, and the beveling position of one conductor and the flat cutting position of the other conductor are filled with solder.
In the step b, after the conductors of the two sections of cables are removed from the inner water-blocking net belt, the conductors are turned over by the crimping die and then restored, the crimping die comprises a mounting seat provided with a mounting groove, a lower pressing block and an upper pressing block are arranged in the mounting groove, a lower notch is arranged on the lower pressing block, an upper notch is arranged on the upper pressing block, the lower notch and the upper notch are matched and formed with mounting holes matched with the conductors, a limiting pin for limiting the upper pressing block and a pushing element for pushing the lower pressing block to move towards the upper pressing block are also arranged on the mounting seat, during restoration, the conductors after being turned over are placed in the mounting holes, the lower pressing block is pushed to move towards the upper pressing block by the pushing element, so that the conductors are compressed by the lower pressing block until the conductors are restored, the lower pressing block is reset after 30 seconds, the lower pressing block is pressurized for multiple times, and the conductors are uniformly restored.
As an improvement of the invention, in the step c, after the end part of the cable is straightened, the insulation layer at the end part of the cable is mechanically retracted through the retraction mold, and the insulation layer is advanced to a natural retraction size by external acting force.
The invention relates to an improvement, which comprises a base, a fixed supporting plate fixedly arranged on the base, a sliding supporting plate slidably arranged on the base and a hydraulic device for driving the sliding supporting plate to move, wherein the fixed supporting plate and the sliding supporting plate are respectively provided with an opening matched with a cable conductor, the fixed supporting plate and the sliding supporting plate are respectively sleeved on the periphery of the cable conductor through the openings, and then are respectively matched with an insulating layer at the end part of the cable through the peripheries of the fixed supporting plate and the sliding supporting plate, when the cable conductor is retracted, the hydraulic device is used for pressurizing to drive the sliding supporting plate to move and offset with the insulating layer at the end part of the cable, so that the insulating layer is stressed to retract towards two sides, and the size of natural retraction is reached in advance.
In the step c, the water blocking tape of the cable body is rewound on the edge of the metal sheath to be even in tightness, then the heating blanket is evenly wound on the cable, and when the ambient temperature is lower than a threshold value, a layer of tinfoil is evenly wrapped outside the heating blanket for heat preservation.
In the step e, the shielding tape is made of crosslinked polyethylene, the tetrafluoro tape and a layer of copper tape are wound on the outer layer of the shielding tape after the wrapping is finished, and the shielding tape is uniformly wrapped and heated by using an asbestos heating tape and tinfoil.
In the step f, the thickness of the insulating wrapping is larger than that of the body, two silica gel pads with the same thickness are arranged at the insulating shielding positions at the two ends of the insulating wrapping, the silica gel pads are aligned and attached to the insulating wrapping, and then a layer of tetrafluoro tape is wrapped.
As an improvement of the invention, in the step g, during heating, a tetrafluoro belt and a high-temperature belt are uniformly wound on the outer layer of the outer shielding sleeve, then an asbestos heating belt is coated, a layer of tinfoil is respectively coated on the inner and outer sides of the heating belt, so that the outer shielding sleeve can be uniformly heated, meanwhile, high-frequency heating is adopted, corresponding high-frequency heating data are set, the temperature sensing effect of an inner conductor core is driven by utilizing the working principle of high frequency, induced current is generated to increase the temperature of the conductor, and heat is generated from the inner side to the outer side, so that the insulating belt and the outer shielding sleeve can be simultaneously formed in a melting mode.
As an improvement of the invention, in the step g, when heating is performed, two sections of cables are cooled through the cooling die, the cooling die comprises an upper cooling die and a lower cooling die, a through hole matched with the diameter of the cables is formed between the upper cooling die and the lower cooling die, an upper water cooling channel is arranged on the upper cooling die, a lower water cooling channel is arranged on the lower cooling die, a first fan is arranged on the upper cooling die, and a second fan is also arranged on the lower cooling die.
As an improvement of the invention, during cooling, a water cooling mode and an air cooling mode are simultaneously started, and cooling water is injected into the upper water cooling channel and the lower water cooling channel in the water cooling mode, so that the upper cooling die and the lower cooling die are cooled, and then the cable in the through hole can be cooled, and in the air cooling mode, the first fan and the second fan are started, so that the upper cooling die and the lower cooling die are cooled.
In the step h, a layer of semi-conductive water-resistant tape is uniformly wrapped outside the insulating shielding layer, then the metal shielding sleeve sleeved in the cable in advance is moved to the metal shielding layer of the cable body and overlapped, 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 with a waterproof tape after the welding point is completed.
Drawings
Fig. 1 is a schematic view of the structure of the cable of the present invention.
Fig. 2 is a schematic view of a weld of the present invention.
Fig. 3 is a schematic view of the retracting mold structure of the present invention.
Fig. 4 is a schematic diagram of the structure of the crimping die of the present invention.
Fig. 5 is a schematic view of the cooling die structure of the invention.
In the figure, 1, a cable; 11. a conductor; 12. an inner shielding layer; 13. an insulating layer; 14. an outer shielding layer; 15. A metal shielding layer; 2. crimping a die; 21. a mounting base; 22. pressing into blocks; 23. pressing the block; 24. a mounting port; 25. a pushing element; 3. retracting the mold; 31. a base; 32. sliding support plates; 33. an opening; 34. a hydraulic device; 4. cooling the mold; 41. a cooling die is arranged; 42. a lower cooling die; 43. a through hole; 44. a first fan; 45. and a second fan.
Detailed Description
The invention is further explained in connection with the drawings.
Referring to the manufacturing process of the ultrahigh voltage direct current 525kV lapped fusion type soft joint shown in fig. 1 to 5, the manufacturing process comprises the following steps:
a. pretreating the cable 1, namely stripping the end parts of the two sections of the cable 1 to expose the core of the conductor 11;
b. the conductor 11 is restored, the conductor 11 core of the two sections of high-voltage cables 1 is welded together, specifically, each layer of the conductor 11 of the two sections of cables 1 is turned outwards, after the internal water-blocking net belt is removed, the conductor 11 of the two sections of cables 1 is restored after being turned over by the crimping die 2, the conductor 11 is restored after being removed, the crimping die 2 comprises a mounting seat 21 provided with a mounting groove, a lower pressing block 23 and an upper pressing block 22 are arranged in the mounting groove, a lower notch is arranged on the lower pressing block 23, an upper notch is arranged on the upper pressing block 22, a mounting opening 24 matched with the conductor 11 is formed by the lower notch and the upper notch, a limiting pin for limiting the upper pressing block 22 and a pushing element 25 for pushing the lower pressing block 23 to move upwards at the pressing block 22 are further arranged on the mounting seat 21, the conductor 11 after being turned over is placed in the mounting opening 24, the lower pressing block 23 is pushed upwards by the pushing element 25, and accordingly the conductor 11 is pressed by the lower pressing block 23 until the conductor 11 is restored until the conductor 11 is maintained to be restored, the conductor 11 is restored to be reset, the conductor 11 can be pressed for a plurality of times, and the conductor 11 can be restored to be pressed for a plurality of times conveniently.
And then the ends of the two recovered conductors 11 are subjected to flush cutting treatment and then beveling treatment respectively, and then the ends of the two conductors 11 are butted, so that the flush cutting positions of the ends of the two conductors 11 are attached, and then the cut positions are welded, so that the beveling position of one conductor 11 and the flush cutting position of the other conductor 11 are filled with solder, and the two conductors 11 can be welded together quickly, and the performance of the welded position can be ensured. And then polishing the welding point of the conductor 11 by using a belt sander, and polishing the welding point and the peripheral conductor 11 by using a special polishing machine for the conductor 11 after polishing, so that the welding point of the conductor 11 is smooth and burr-free.
c. The cable 1 is heated and straightened, the ends of the two sections of the cable 1 are heated, the stress in the cable 1 is removed, the water-blocking tape of the cable 1 body is rewound on the metal sheath edge, the tightness is even, then the heating blanket is evenly wound on the cable 1, when the ambient temperature is lower than a threshold value, a layer of tinfoil is evenly wound outside the heating blanket for heat preservation, and the ends of the cable 1 are straightened, so that the ends of the cable 1 are not bent after being cooled.
After straightening the end of the cable 1, mechanically retracting the insulating layer 13 at the end of the cable 1 through the retracting mold 3, enabling the insulating layer 13 to reach a natural retracting size in advance through external acting force, wherein the retracting mold 3 comprises a base 31, a fixed supporting plate fixedly arranged on the base 31, a sliding supporting plate 32 slidingly arranged on the base 31 and a hydraulic device 34 for driving the sliding supporting plate 32 to move, the fixed supporting plate and the sliding supporting plate 32 are respectively provided with an opening 33 matched with the conductor 11 of the cable 1, the fixed supporting plate and the sliding supporting plate 32 are respectively sheathed on the periphery of the conductor 11 of the cable 1 through the openings 33, and then the periphery of the fixed supporting plate and the sliding supporting plate 32 are respectively matched with the insulating layer 13 at the end of the cable 1, and when retracting, the insulating layer 13 is stressed to retract to two sides, the size of the insulating layer 13 is reached in advance through the hydraulic device 34, so that the retracting time of the insulating layer 13 can be shortened.
d. The manufacturing of the reaction force cone, namely manufacturing the insulation into a pencil stub-shaped reaction force cone according to the process size by using a special wire stripping knife for the cable 1, then performing rough machining on the insulation surface by using a glass knife to smooth, and performing polishing treatment on the insulation surface and the shielding surface by using a special polishing machine, wherein the ratio between the length of the reaction force cone and the insulation thickness is between 10 and 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 restored, an inner shielding sleeve with the matched size is firstly manufactured, semiconductive nylon cloth is uniformly wrapped outside a conductor 11 wire core by manpower, then the inner shielding sleeve is longitudinally wrapped outside the semiconductive nylon cloth, 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 tetrafluoro belt and a copper belt are uniformly wrapped on the outer layer, two heating couples are arranged outside the copper belt and used for sensing the heating temperature, the heating is stopped after the heating couple temperature reaches the set temperature, then asbestos heating belts are wrapped, a layer of tinfoil is wrapped inside and outside the heating belts, so that the conductor 11 shielding can be heated uniformly, the inner shielding sleeve is heated, melted and molded by heating equipment, a switch is disconnected after the heating belts are heated for a period of time, cooling is started after the conductor 11 shielding is cooled, and polishing treatment is performed; and the inner shielding sleeve is manufactured, and the inner shielding layer 12 is restored by adopting a longitudinal cladding mode, so that gaps and air holes can be reduced.
f. After the insulation layer 13 is restored and the inner shielding layer 12 is restored, uniformly wrapping the insulation tape outside the inner shielding layer 12; the insulating tape is made of crosslinked polyethylene, the thickness of the insulating tape is larger than that of the body after wrapping, two silica gel pads with the same thickness are arranged at the insulating shielding positions at two ends of the insulating tape, the silica gel pads are aligned and attached to the insulation of wrapping, and then a layer of tetrafluoro tape is wrapped. The silica gel pad prevents the wrap insulation from spreading to both sides due to excessive tension. The flow direction after the insulation heating can be effectively fixed, the insulation is prevented from flowing out to two ends after the insulation is heated, meanwhile, the internal tension of the insulation is kept, and the gap in the insulation molecule is reduced. Meanwhile, the silica gel pad improves the convenience degree of wrapping the tetrafluoro belt and the high-temperature belt, overcomes the defect of too low insulation shielding, and is more convenient and uniform to wrap.
g. The outer shielding layer 14 is restored, an outer shielding sleeve is firstly manufactured, then the outer shielding sleeve is longitudinally coated outside the insulating band, the material of the outer shielding sleeve is the same as that of the outer shielding layer 14 in the cable 1, heating is carried out, the insulating band and the outer shielding sleeve are formed in a melting mode at the same time, the insulating layer 13 is formed after the insulating band is formed in a melting mode, and the outer shielding layer 14 is formed after the outer shielding sleeve is formed in a melting mode. During heating, the outer layer of the outer shielding sleeve is uniformly wound with the tetrafluoro belt and the high-temperature belt, then the asbestos heating belt is coated, and the inner and outer surfaces of the heating belt are respectively coated with a layer of tinfoil paper, so that the outer shielding sleeve can be heated uniformly, high-frequency heating is adopted, corresponding high-frequency heating data are set, the temperature sensing effect of the 11 wire cores of the conductors inside is driven by utilizing the working principle of high frequency, the temperature of the conductors 11 is improved by generating induction current, and heat is generated from inside to outside, so that the insulating belt and the outer shielding sleeve can be formed in a fusion mode simultaneously.
When heating, cool off two sections of cable 1 through cooling die 4, cooling die 4 includes cooling die 41 and lower cooling die 42, be formed with the through-hole 43 with cable 1 diameter looks adaptation between last cooling die 41 and the lower cooling die 42, be equipped with the water-cooling passageway on going up the cooling die 41, be equipped with the lower water-cooling passageway on the lower cooling die 42, be equipped with first fan 44 on going up the cooling die 41, still be equipped with second fan 45 on the lower cooling die 42. During the use, open water-cooling mode and forced air cooling mode simultaneously, under the water-cooling mode, through upwards water-cooling passageway and lower water-cooling passageway in injection cooling water, thereby make last cooling die 41 and lower cooling die 42 cooling, and then make cable 1 in the through-hole 43 can cool down, under the forced air cooling mode, open through first fan 44 and second fan 45, make last cooling die 41 and lower cooling die 42 cooling, and then make cable 1 in the through-hole 43 can cool down, and a structure is simple, and convenient operation, thereby avoid cable 1 to receive the influence of joint department heating.
h. The metal shielding layer 15 is restored, 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 wrapping evenly and flatly, 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 slopes to be connected with the metal shielding layer 15 of the cable 1, then the metal shielding sleeve is welded with the metal shielding layer 15 of the cable 1 by using a welding gun, two ends are all in this operation, the welding point is filled up by using a waterproof tape after the welding is completed, the outer sheath prepared in advance is moved to the middle of a joint, and the outer sheath is heated and quickly contracted by using a thermal spray gun to complete the repair.
According to the manufacturing process, the inner shielding layer 12 in the cable 1 body is made of the same material to form an inner shielding sleeve, then the inner shielding strip is heated and melted to form, the inner shielding layer 12 is recovered, gaps and air holes of the inner shielding layer 12 are reduced, the insulating tape is heated and melted to form, the insulating layer 13 is recovered, the outer shielding layer 14 in the cable 1 body is made of the same material to form an outer shielding sleeve, the outer shielding sleeve is longitudinally coated and then heated and melted to form, the outer shielding layer 14 is recovered, the gaps and the air holes of the outer shielding layer 14 can be reduced, finally the metal shielding layer 15 in the cable 1 body is made of the same material to form a metal shielding sleeve, then the metal shielding sleeve is longitudinally coated outside the conductor 11 manually, the characteristics of the body are closest, the ultra-high voltage direct current 525 direct current cable 1 can be met, the insulating tape and the outer shielding sleeve are simultaneously heated and melted to form simultaneously, recovery time is shortened, loss brought by kV power failure is reduced as much as possible, and the insulating tape and the outer shielding sleeve are simultaneously coated by the asbestos heating tape and high frequency heating, therefore the cable is cooled by adopting a special die, and the special die for cooling 1 is not influenced by the high-temperature compression joint 1, and the cooling time is shortened by adopting a special die for cooling die 2, and the cooling time is shortened by adopting the die 1.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the structures, features and principles of the invention are therefore intended to be embraced therein.
Claims (8)
1. A manufacturing process of an ultrahigh-voltage direct-current 525kV lapped fusion type soft joint is characterized by comprising the following steps of: the method comprises the following steps:
a. the cable pretreatment, namely stripping the end parts of the two sections of cables to expose the conductor cores;
b. restoring the conductor, and welding conductor cores of the two sections of high-voltage cables together by welding;
c. heating and straightening the cable, heating the end parts of the two sections of cables, removing the stress in the cables, straightening the end parts of the cables, and ensuring that the end parts of the cables are not bent after being cooled; after straightening the end part of the cable, mechanically retracting the insulating layer at the end part of the cable through a retracting die, and enabling the insulating layer to reach the natural retracting size in advance through external acting force; the retraction mould comprises a base, a fixed supporting plate fixedly arranged on the base, a sliding supporting plate slidingly arranged on the base and a hydraulic device for driving the sliding supporting plate to move, wherein the fixed supporting plate and the sliding supporting plate are respectively provided with an opening matched with a cable conductor, the fixed supporting plate and the sliding supporting plate are respectively sleeved on the periphery of the cable conductor through the openings, and then are respectively matched with an insulating layer at the end part of the cable through the peripheries of the fixed supporting plate and the sliding supporting plate, when the retraction is performed, the hydraulic device is used for pressurizing to drive the sliding supporting plate to move and offset the insulating layer at the end part of the cable, so that the insulating layer is stressed to retract towards two sides, and the size of natural retraction is reached in advance;
d. the manufacturing of a reaction force cone, namely, the end parts of insulating layers of the cables at two ends are made into the reaction force cone;
e. the inner shielding layer is restored, an inner shielding sleeve is manufactured firstly, semiconductive nylon cloth is uniformly wrapped outside a conductor core at a joint, then the inner shielding sleeve is longitudinally wrapped outside the semiconductive nylon cloth, the material of the inner shielding sleeve is the same as that of the inner shielding layer in the cable, and then the inner shielding sleeve is heated, melted and molded;
f. after the insulation layer is restored, the inner shielding layer is restored, and the insulation belt is uniformly wrapped outside the inner shielding layer;
g. the outer shielding layer is recovered, an outer shielding sleeve is firstly manufactured, then the outer shielding sleeve is longitudinally coated outside the insulating band, the material of the outer shielding sleeve is the same as that of the outer shielding layer in the cable, and then heating is carried out, so that the insulating band and the outer shielding sleeve are formed in a melting mode at the same time, an insulating layer is formed after the insulating band is formed in a melting mode, and the outer shielding layer is formed after the outer shielding sleeve is formed in a melting mode;
h. and recovering the metal shielding layer, uniformly wrapping the semiconductive water blocking tape on the outer layer of the outer shielding layer, and then covering the metal shielding sleeve on the cable body for welding recovery.
2. The process for manufacturing the ultrahigh-voltage direct-current 525kV lapped fusion type soft joint as claimed in claim 1, which is characterized in that: in the step b, each layer of conductors of the two sections of cables is turned outwards, the inner water-blocking net belt is removed, then the ends of the two conductors are subjected to flush cutting treatment and then beveling treatment respectively, then the ends of the two conductors are butted, so that the flush cutting positions of the ends of the two conductors are attached, and then the incision is welded, so that the beveling position of one conductor and the flush cutting position of the other conductor are filled with solder.
3. The process for manufacturing the ultrahigh-voltage direct-current 525kV lapped fusion type soft joint as claimed in claim 1, which is characterized in that: in step b, after removing inside water blocking guipure, resume through the crimping mould to conductor turn over the layer after, the crimping mould is including the mount pad that is equipped with the mounting groove, be equipped with down briquetting and last briquetting in the mounting groove, be equipped with down the notch on the briquetting down, be equipped with the notch on the last briquetting, lower notch and last notch cooperation are formed with the erection joint with the conductor, still install on the mount pad and be used for carrying out spacing limiting pin and the promotion down briquetting the promotion component that the briquetting upwards moved the briquetting department, during the recovery, place the conductor after turning over in the erection joint, the rethread promotes the briquetting and upwards removes the briquetting department down to compress tightly the conductor through the briquetting down, and the briquetting resets down after keeping 30 seconds, the briquetting is pressurized many times, and the conductor evenly resumes and accomplish.
4. The process for manufacturing the ultrahigh-voltage direct-current 525kV lapped fusion type soft joint as claimed in claim 1, which is characterized in that: in the step f, the thickness of the insulating tape is larger than that of the body after wrapping, two silica gel pads with the same thickness are arranged on the insulating shielding positions at two ends of the insulating tape, and the silica gel pads are aligned and attached in the wrapping insulation.
5. The process for manufacturing the ultrahigh-voltage direct-current 525kV lapped fusion type soft joint as claimed in claim 1, which is characterized in that: in step g, during heating, evenly twine tetrafluoro area and high temperature area in the skin of outer shielding cover, then cladding asbestos heating band, respectively cladding one deck tinfoil in the heating band is inside and outside, make outer shielding cover can be heated evenly, adopt high frequency heating simultaneously, set up corresponding high frequency heating data, utilize the theory of operation of high frequency, through the temperature sensing effect that drives inside conductor core, produce induced current and improve the temperature of conductor, from inside to outside produces heat thereby make insulating tape and outer shielding cover can fusion forming simultaneously.
6. The process for manufacturing the ultrahigh-voltage direct-current 525kV lapped fusion type soft joint as claimed in claim 1, which is characterized in that: in step g, when heating, cool off two sections cables through cooling mould, cooling mould includes cooling mould and lower cooling mould, go up and be formed with the through-hole with cable diameter looks adaptation between cooling mould and the lower cooling mould, upward be equipped with water cooling passageway on the cooling mould, be equipped with down water cooling passageway on the lower cooling mould, upward be equipped with first fan on the cooling mould, still be equipped with the second fan on the lower cooling mould.
7. The process for manufacturing the ultrahigh-voltage direct-current 525kV lapped fusion type soft joint as claimed in claim 6, which is characterized in that: during cooling, the water cooling mode and the air cooling mode are started simultaneously, and cooling water is injected into the upper water cooling channel and the lower water cooling channel in the water cooling mode, so that the upper cooling die and the lower cooling die are cooled, a cable in the through hole can be cooled, and the first fan and the second fan are started in the air cooling mode, so that the upper cooling die and the lower cooling die are cooled.
8. The process for manufacturing the ultrahigh-voltage direct-current 525kV lapped fusion type soft joint as claimed in claim 1, which is characterized in that: in the step h, a layer of semiconductor water-resistant tape is uniformly wrapped outside the insulating shielding layer, then the metal shielding sleeve sleeved in the cable in advance is moved to the metal shielding layer of the cable body and is overlapped, the edge of the metal shielding sleeve is welded with the metal shielding layer of the cable by utilizing a high-temperature spray gun, and after the welding is completed, the welding point is filled with a waterproof tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210748244.2A CN115149469B (en) | 2022-06-29 | 2022-06-29 | Manufacturing process of ultrahigh-voltage direct-current 525kV lapped fusion type soft joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210748244.2A CN115149469B (en) | 2022-06-29 | 2022-06-29 | Manufacturing process of ultrahigh-voltage direct-current 525kV lapped fusion type soft joint |
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| Publication Number | Publication Date |
|---|---|
| CN115149469A CN115149469A (en) | 2022-10-04 |
| CN115149469B true CN115149469B (en) | 2023-07-25 |
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| CN202210748244.2A Active CN115149469B (en) | 2022-06-29 | 2022-06-29 | Manufacturing process of ultrahigh-voltage direct-current 525kV lapped fusion type soft joint |
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| CN103986098B (en) * | 2014-05-16 | 2016-09-21 | 国家电网公司 | The manufacture method of medium-pressure power cable transition joint longitudinal water-blocking device |
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| CN209045978U (en) * | 2018-11-27 | 2019-06-28 | 珠海信濠精密组件有限公司 | A kind of cable connection structure |
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| CN209401347U (en) * | 2019-01-19 | 2019-09-17 | 浙江昌泰电力电缆有限公司 | A kind of dedicated middle pressure branch cable of urban electric power transmission |
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| CN110993154A (en) * | 2019-12-26 | 2020-04-10 | 中天科技海缆有限公司 | Ultrahigh-pressure submarine cable soft joint and manufacturing method thereof |
| CN214280731U (en) * | 2021-02-02 | 2021-09-24 | 国网河北省电力有限公司邯郸市永年区供电分公司 | Cable joint insulation melting device |
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