CN110350451A - Manufacturing method of high-voltage crosslinked polyethylene insulated cable molding type insulated joint - Google Patents
Manufacturing method of high-voltage crosslinked polyethylene insulated cable molding type insulated joint Download PDFInfo
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- CN110350451A CN110350451A CN201910532532.2A CN201910532532A CN110350451A CN 110350451 A CN110350451 A CN 110350451A CN 201910532532 A CN201910532532 A CN 201910532532A CN 110350451 A CN110350451 A CN 110350451A
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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
- H02G1/14—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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Abstract
The invention discloses a method for manufacturing a molded insulating joint of a high-voltage cross-linked polyethylene insulated cable, which comprises the following specific steps: 1) stripping and pretreating a cable; 2) welding a conductor; 3) molding the conductor shield; 4) molding the I section of the joint insulation main body by a template method; 5) molding the I section of the insulation shield of the joint by a template method; 6) molding a section II of the joint insulation main body by a template method; 7) molding a joint insulation shielding section II by a template method; 8) vulcanizing; 9) degassing; 10) wrapping the strip; 11) and (5) installing an insulating copper shell. Through the mode, the manufacturing method of the high-voltage cross-linked polyethylene insulated cable molding type insulated joint abandons the original integral prefabricated joint, adopts the same material as a cable body to mold and recover the conductor shielding layer, the insulating layer and the insulated shielding layer, does not have a physical interface, realizes the integration of the joint main insulation and the cable main insulation, ensures that the joint main insulation and the cable main insulation are not influenced by thermal expansion and contraction, has good waterproof performance and uniform and stable distribution of an electric field and a thermal field.
Description
Technical field
The invention belongs to a kind of cable intermediate joints, and in particular to a kind of high-voltage cross-linked polyethylene sheathed moulded is exhausted
The manufacturing method of edge connector.
Background technique
The high-tension cable of 66kV or more is mostly single-core cable system, and protective metal shell is there are induced voltage and as cable is long
The increase of degree and increase, personal safety can be jeopardized by stacking up, and short trouble, lightning impulse or operation especially occurs in route
When overvoltage, oversheath may be punctured, in addition, if cable shield both ends are directly grounded, then can generate very big circulation loss,
It reduces electric cable heating by current-carrying capacity, cable heat ageing is accelerated therefore when single-core high-voltage cable route is very long, to need by setting
Set insulating joint (protective metal shell and insulation shield of two end cable of connector electrically disconnect), cooperate cross interconnected case into
Row transposition connection, realizes cross interconnected earthing mode, to reduce the induced voltage of protective metal shell, effectively avoids cable
When short trouble, damage caused by induced overvoltage reduces the circulation loss of sheath, guarantees line security stable operation.
Nowadays the domestic HV cable accessories generally used are Integral prefabricated type connectors, but prefab cable accessory is not of the same race
The assembly of material composition, and accumulation space charge is easy at different material interfaces, so that local field strength distorts, or even cause electricity
Branch and puncture, on the other hand, due to being influenced by running temperature, the performance of expanding with heat and contract with cold of different materials is variant, can lead
It causes active interface occur at material interface, is invaded vulnerable to moisture and accelerate connector cracking, moreover, rubber insulators are in long-term operation
It is acted on, can be relaxed so that interfacial pressure reduces and rubber-covered since elasticity modulus declines by electric field and thermal field in the process
The precipitation of part additive, eventually leads to decreasing insulating, and there are security risks, in addition, Integral prefabricated type connector completes
After must be fixed from and the operation such as moved, shifted, otherwise will lead to internal component sliding or dislocation, it is hidden to there is safety
Suffer from, from the point of view of construction budget angle, Integral prefabricated type connector it is oversized, need in cable duct or cable tunnel special
Setting widened section considerably increases the capital construction cost of cable run for disposing connector.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of insulation of high-voltage cross-linked polyethylene sheathed moulded to connect
The manufacturing method of head, can be improved the reliability and service life of product.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of high-voltage cross-linking polythene insulation
The manufacturing method of cable moulded insulating joint, specific steps include:
1) cable stripping and pretreatment: layer-by-layer stripping is carried out to cable end according to drawing requirement, is inserted in insulated copper shell in advance, so
Cable is pre-processed afterwards；
2) conductor welds: after cable conductor uses the centering of conductors dedicated weld holder, layering carries out silver brazing and connects, after every layer has been welded
Conductor pad require to carry out polishing with 800 mesh sand paper and be cleaned with cable cleaning paper, and each layer described is led
Body weld locations all mutually stagger, until isometrical recovery cable conductor；
3) conductor shielding molds: one layer of the wrapped semiconductive nylon tape of half lap first on the outside of the cable conductor restored, so
Prefabricated cross-linking two layers of EVA semi-conductive tape of half-lap packet afterwards, is subsequently mounted the metal with heating function and presses mold, pass through program
140 DEG C ~ 180 DEG C are warming up to, and keeps 30min, makes cable body conductor shielding and connector conductor shield is cross-linked with each other combination
It is integrated, after room temperature, removes the metal and press mold, the surface after crosslinking is carried out with 1200 mesh sand paper
Fine polishing；
4) I sections of template splice insulation main body moldings: successively installation template A, template B, template C and gold on the surface after polishing
Belong to mold, wherein the template A is equipped with template injecting hole, heating device built in the metal die is simultaneously equipped with the first mold note
Mole, the second mold injection hole and third mold injection hole, first mold injection hole are aligned with the template injecting hole, institute
It states the second mold injection hole and third mold injection hole to be connected with the template B and the template C respectively, process control
It is required after reaching 130 DEG C ~ 140 DEG C according to heating curve, by small-sized extruder by the crosslinkable polyethylene material of molten condition
The template A is squeezed into, in the cavity that the template B and the cable body are surrounded by first mold injection hole,
When pressure reaches 1.5 ~ 3.0MPa, stop heating after keeping 15 ~ 30min of pressure；
5) template splice insulation shields I sections of moldings: when after naturally cool to 50 DEG C ~ 60 DEG C, opening the metal die, removes
The template A installs the metal mold to I sections of the molding splice insulation main body surface treatments such as cut and polished again
Tool, process control requires after reaching 115 DEG C ~ 125 DEG C according to heating curve, by small-sized extruder by cross-linking EVA semiconductive
Material squeezes into I sections of the splice insulation main body, the template B and metal die institute by first mold injection hole
In the cavity surrounded, when pressure reaches 1.0 ~ 2.5MPa, stop heating after keeping 15 ~ 30min of pressure；
6) II sections of template splice insulation main body moldings: when after naturally cool to 50 DEG C ~ 60 DEG C, the metal die is opened, is torn open
Except the template B；It I section are shielded to molding splice insulation is cut and is polished etc. and be surface-treated, the metal is installed again
Mold, process control requires after reaching 115 DEG C ~ 125 DEG C according to heating curve, by small-sized extruder by crosslinkable polyethylene material
Material squeezes into I sections of the splice insulation main body by second mold injection hole, the splice insulation shields I sections, the mould
In the cavity that plate C and the metal die are surrounded, when pressure reaches 1.0 ~ 2.5MPa, stop after keeping 15 ~ 30min of pressure
Heating；
7) template splice insulation shields II sections of moldings: when after naturally cool to 50 DEG C ~ 60 DEG C, opening the metal die, tears open
Except the template C, to II sections of the molding splice insulation main body surface treatments such as cut and polished, the metal is installed again
Mold, process control require after reaching 115 DEG C ~ 125 DEG C according to heating curve, are partly led cross-linking EVA by small-sized extruder
Electric material by third mold injection hole squeezes into II sections of the splice insulation main body and the metal die is surrounded
In cavity, when pressure reaches 1.0 ~ 2.5MPa, stop heating after keeping 15 ~ 30min of pressure；
8) vulcanize: when after naturally cool to 50 DEG C ~ 60 DEG C, opening the metal die, II sections are shielded to molding splice insulation
It the surface treatment such as is cut and is polished, the metal die is installed again, passes through pressure-resistant rubber in first mold injection hole
Sebific duct connects dry high purity nitrogen bottle pressure reducing valve, gas gauge is installed in second mold injection hole, in the third mould
Having injecting hole and exhaust valve is installed, nitrogen is filled with by first mold injection hole, heated for controlling temperature is maintained at 220 DEG C ~ 240 DEG C,
Pressure is maintained at 2 ~ 4MPa, stops heating after carrying out vulcanization crosslinking 4 ~ 12 hours, so that the cable body, the splice insulation
I sections of main body, the splice insulation shield I section, II sections of each layers of II sections of the splice insulation main body and splice insulation shielding it
Between be cross-linked with each other and be combined into one；
9) degasification: when being cooled to 70 DEG C ~ 80 DEG C, opening the exhaust valve, is persistently filled with from first mold injection hole dry
Dry high pure nitrogen, and temperature is kept to stablize at 70 DEG C ~ 80 DEG C, degasification process is carried out, stops heating after continuing 12 ~ 48 hours, holds
Continuous be passed through after dry high purity nitrogen is cooled to room temperature to adapter body opens the metal die；
10) strip lap: I sections are shielded in the splice insulation and the splice insulation shields the wrapped semiconductive of half lap on the outside of II sections
Buffer water-blocking band, the two semi-conductive buffer water-blocking band middle wares away from for 10 ~ 30cm, and with the cable body semi-conductive buffer
Waterstop is overlapped 15cm, then the wrapped thin sheet lead band of half lap and 20cm Chong Die with the corrugated aluminum sheath of the cable body, institute
It states thin sheet lead band and corrugated aluminum sheath and tightens fixation with thin copper wire, it is then non-thread at wrapped six layers of adapter body middle position half lap
Property stress control belt, the non-linear stress controls band 15cm Chong Die with semi-conductive buffer water-blocking band described in two sides, finally whole
A wrapped six layer of first waterproof insulation self-adhesive tape of connector exterior half lap；
11) insulated copper shell is installed: the insulated copper shell is made of the first plastic copper shell and the second plastic copper shell, and described first is plastic
Copper shell and the second plastic copper shell are separately mounted to the two sides of the adapter body, the first plastic copper shell and second packet
It is fixed by screw between modeling copper shell and dead ring is installed, the first plastic copper shell and the second plastic copper shell are led with cable
The wrinkle lead sheath at body both ends is connected by lead sealing, installs the first heat-shrinkable T bush on the outside of the lead sealing, and the two of the dead ring
Side is connected tightly around sealing joint strip, the sealing joint strip is wrapped with the described first plastic copper shell and second plastic copper shell surface
It connects, the second waterproof insulation self-adhesive tape, second waterproof insulation is also closely surrounded on the dead ring and the sealing joint strip
The second heat-shrinkable T bush is installed on the outside of self-adhesive tape, to complete the assembling of the insulated copper shell.
In a preferred embodiment of the present invention, the pretreatment includes but is not limited to the corrugated aluminum sheath surface to cable
The corrugated aluminum sheath port is pulled back horn-like and removes flash removed, coats the corrugated aluminum sheath transition leads by cleaning
One layer " bottom lead ", to the heating of cable connection end alignment, cable insulation is cut and is polished cable insulation layer surface.
In a preferred embodiment of the present invention, the material of the template A, the template B and the template C are high temperature resistant
High molecular material.
In a preferred embodiment of the present invention, the material of the template A, the template B and the template C are silicon rubber
Glue, polyurethane or nitrile rubber.
In a preferred embodiment of the present invention, it is equipped with and connects on the described first plastic copper shell and the second plastic copper shell
Ground wire copper pipe.
In a preferred embodiment of the present invention, described on the described first plastic copper shell and the second plastic copper shell connects
The nozzle direction of ground wire copper pipe is identical.
In a preferred embodiment of the present invention, between the described first plastic copper shell and the second plastic copper shell with it is described
Sealing ring is installed in the contact surface of dead ring.
In a preferred embodiment of the present invention, the template A is equipped with template extended segment, the template extended segment and institute
It is parallel to state template C.
In a preferred embodiment of the present invention, the first link slot and the second link slot are respectively equipped on the template B.
In a preferred embodiment of the present invention, first link slot and second link slot respectively with the template
A and the template C are matched.
The beneficial effects of the present invention are: a kind of system of high-voltage cross-linked polyethylene sheathed moulded insulating joint of the present invention
Method is made, which abandons original Integral prefabricated type connector, molds using material identical as cable body and restores conductor
Shielded layer, insulating layer and insulation screen are not present physical interface, realize the one of connector major insulation Yu cable major insulation
Change, so that it is not affected by thermal expansion and contraction, waterproof performance is good, and electric field and heterogeneity phantom are uniform and stable, and excellent electric properties use the longevity
Persistently, connector can be moved life after completing, carry and normal cable drum, the joint structure after completing are tight
It gathers, size is small, occupies little space, and can satisfy the arrangement in narrow work well, to reduce capital construction cost.
Detailed description of the invention
Fig. 1 is a kind of scheme of installation of template when high-voltage cross-linked polyethylene sheathed moulded insulating joint makes.
Fig. 2 is a kind of structural schematic diagram of high-voltage cross-linked polyethylene sheathed moulded insulating joint.
Fig. 3 is the partial enlarged view at a kind of high-voltage cross-linked polyethylene sheathed moulded insulating joint A.
Fig. 4 is the partial enlarged view at a kind of high-voltage cross-linked polyethylene sheathed moulded insulating joint B.
The components in the drawings are labeled as follows: 1, wrinkle lead sheath；2, nylon tape；3, connector conductor shield；4, connector
I sections of insulating body；5, splice insulation main body II sections；6, splice insulation shields I sections；7, splice insulation shields II sections；8, extended segment；
9, semi-conductive buffer water-blocking band；10, thin sheet lead band；11, non-linear stress controls band；12, the first waterproof insulation self-adhesive tape；13,
First plastic copper shell；14, the second plastic copper shell；15, it is grounded copper pipe；16, dead ring；17, sealing ring；18, lead sealing；19,
One heat-shrinkable T bush；20, template A；21, template B；22, template C；23, metal die；24, the first link slot；25, the second connection
Slot；26, template extended segment；27, template injecting hole；28, the first mold injection hole；29, the second mold injection hole；30, third mould
Has injecting hole；31, sealing joint strip；32, the second waterproof insulation self-adhesive tape；33, the second heat-shrinkable T bush.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Referring to FIG. 1 to FIG. 4,
Embodiment 1
Make YJLW03-Z-64/110KV 1*800mm2The method of cross-linked polyethylene insulated cable moulded insulating joint first exists
Purification room and workbench are built in scene, then carry out according to standard operation guiding book, and specific steps include:
1) cable stripping and pretreatment: layer-by-layer stripping is carried out to cable end according to drawing requirement, is inserted in insulated copper shell in advance, so
Cable is pre-processed afterwards, the pretreatment includes but is not limited to the corrugated aluminum sheath surface clean of cable, by the wrinkle
Line aluminum sheath end port is pulled back horn-like and removes flash removed, the corrugated aluminum sheath transition leads is coated to one layer " bottom lead ", is right
The heating alignment of cable connection end cuts cable insulation and polishes cable insulation layer surface.
2) conductor welds: after cable conductor uses the centering of conductors dedicated weld holder, layering carries out silver brazing and connects, every layer of welding
Conductor pad after complete is required to carry out polishing with 800 mesh sand paper and be cleaned with cable cleaning paper, and each layer of institute
It states conductor weld locations all to mutually stagger, until isometrical recovery cable conductor.
3) conductor shielding molds: the wrapped semiconductive nylon tape 2 one of half lap first on the outside of the cable conductor restored
Layer, then wrapped prefabricated cross-linking two layers of EVA semi-conductive tape of half lap, is subsequently mounted the metal with heating function and presses mold, leads to
It crosses program and is warming up to 180 DEG C, and keep 30min, make cable body conductor shielding and connector conductor shield 3 is cross-linked with each other combination
It is integrated, after room temperature, removes the metal and press mold, the surface after crosslinking is carried out with 1200 mesh sand paper
Fine polishing, the nylon tape 22 prevent in the insertion of connector conductor shield 3 cable conductor in the production process.
4) template splice insulation main body I section 4 molds: successively installation template A20 on the surface after polishing, template B21,
Template C22 and metal die 23, wherein the template A20 is equipped with template injecting hole 27, the built-in heating of the metal die 23
Device is simultaneously equipped with the first mold injection hole 28, the second mold injection hole 29 and third mold injection hole 30, the first mold note
Mole 28 is aligned with the template injecting hole 27, second mold injection hole 29 and third mold injection hole 30 respectively with
The template B21 is connected with the template C22, and described program control requires after reaching 130 DEG C according to heating curve, by small
The crosslinkable polyethylene material of molten condition is squeezed into the template by first mold injection hole 28 by type extruder
In the cavity that A20, the template B21 and the cable body are surrounded, when pressure reaches 2.0MPa, pressure 30min is kept
Stop heating afterwards.
5) template splice insulation shielding I section 6 molds: when after naturally cool to 50 DEG C, opening the metal die 23, tears open
Except the template A20, molding splice insulation main body I section 4 such as is cut and polished at the surface treatment, the gold is installed again
Belong to mold 23, process control requires after reaching 120 DEG C according to heating curve, by small-sized extruder by cross-linking EVA semiconductive
Material squeezes into the splice insulation main body I section 4, the template B21 and the metal by first mold injection hole 28
In the cavity that mold 23 is surrounded, when pressure reaches 1.5MPa, stop heating after keeping pressure 15min.
6) template splice insulation main body II section 5 molds: when after naturally cool to 50 DEG C, the metal die 23 is opened,
Remove the template B21；Molding splice insulation shielding I section 6 such as is cut and is polished at the surface treatment, install again described in
Metal die 23, process control requires after reaching 125 DEG C according to heating curve, by small-sized extruder by crosslinkable polyethylene material
Material squeezes into the splice insulation main body I section 4 by second mold injection hole 29, the splice insulation shields I section 6, institute
It states in the cavity that template C22 and the metal die 23 are surrounded, when pressure reaches 2MPa, stops after keeping pressure 15min
Heating.
7) template splice insulation shielding II section 7 molds: when after naturally cool to 50 DEG C, the metal die 23 is opened,
The template C22 is removed, molding splice insulation main body II section 5 such as is cut and polished at the surface treatment, institute is installed again
State metal die 23, process control requires after reaching 120 DEG C according to heating curve, by small-sized extruder by cross-linking EVA half
Conductive material squeezes into 23 institute of the splice insulation main body II section 5 and the metal die by third mold injection hole 30
In the cavity surrounded, when pressure reaches 1.5MPa, stop heating after keeping pressure 15min.
8) vulcanize: when after naturally cool to 60 DEG C, opening the metal die 23, II sections are shielded to molding splice insulation
7 the surface treatment such as are cut and are polished, and are installed the metal die 23 again, are passed through in first mold injection hole 28 resistance to
It presses rubber tube to connect dry high purity nitrogen bottle pressure reducing valve, gas gauge is installed in second mold injection hole 29, described
Exhaust valve is installed in third mold injection hole 30, is filled with nitrogen by first mold injection hole 28, heated for controlling temperature is maintained at 225
DEG C, pressure is maintained at 3MPa, stops heating after carrying out vulcanization crosslinking 6 hours, so that the cable body, the splice insulation master
Body I section 4, splice insulation shielding I section 6, the splice insulation main body II section 5 and the splice insulation shield each layer of II section 7
Between be cross-linked with each other and be combined into one.
9) degasification: when being cooled to 70 DEG C, opening the exhaust valve, is persistently filled with from first mold injection hole 28 dry
Dry high pure nitrogen, and temperature is kept to stablize at 70 DEG C, degasification process is carried out, stops heating after continuing 24 hours, is continually fed into dry
Dry high pure nitrogen opens the metal die 23 after being cooled to room temperature to adapter body.
10) strip lap: I section 6 is shielded in the splice insulation and splice insulation shielding 7 outside half lap of II section is wrapped
Semi-conductive buffer water-blocking band 9, two 9 middle wares of semi-conductive buffer water-blocking band are partly led with the cable body away from for 20cm
Electric buffer water-blocking band 9 is overlapped 15cm, then the wrapped thin sheet lead band 10 of half lap and the corrugated aluminum sheath weight with the cable body
Folded 20cm, the thin sheet lead band 10 and corrugated aluminum sheath tighten fixation with thin copper wire, then in adapter body middle position half lap
Wrapped six layers of non-linear stress controls band 11, semi-conductive buffer water-blocking band 9 described in the non-linear stress control band 11 and two sides
It is overlapped 15cm, finally in the wrapped six layer of first waterproof insulation self-adhesive tape 12 of entire connector exterior half lap, the semi-conductive buffer resistance
There are gauffers for preventing thin 10 inner surface of sheet lead band to damage the splice insulation shielded layer, the thin lead for water band 9
Belt 10 is soft, can reduce the damage to the splice insulation shielded layer, the thin sheet lead band compared to other metals
10 match with the semi-conductive buffer water-blocking band 9, play dual protective effect.
11) insulated copper shell is installed: the insulated copper shell is made of the first plastic copper shell 13 and the second plastic copper shell 14, described
First plastic copper shell 13 and the second plastic copper shell 14 are separately mounted to the two sides of the adapter body, the first plastic copper shell
It is fixed by screw between 13 and the second plastic copper shell 14 and dead ring 16 is installed, the first plastic copper shell 13 and described
Second plastic copper shell 14 is connect with the wrinkle lead sheath 1 at cable conductor both ends by lead sealing 18, is installed on the outside of the lead sealing 18
First heat-shrinkable T bush 19, institute of the lead sealing 18 for the described first plastic copper shell 13 and second plastic the copper shell 14 and both ends
Sealing and fixing between wrinkle lead sheath 1 is stated, first heat-shrinkable T bush 19 not only plays protection to the lead sealing 18 and makees
With, while being fixedly connected for the described first plastic copper shell 13 and the second plastic copper shell 14 and cable surface.
The two sides of the dead ring 16 are tightly around wrapping sealing joint strip 31, the sealing joint strip 31 and the described first plastic copper
Shell 13 is connected with the described second plastic 14 surface of copper shell, is also closely surrounded on the dead ring 16 and the sealing joint strip 31
Second waterproof insulation self-adhesive tape 32 installs the second heat-shrinkable T bush 33 on the outside of the second waterproof insulation self-adhesive tape 32, thus complete
At the assembling of the insulated copper shell, second heat-shrinkable T bush 33 has not only acted as protective effect, while providing and uniformly pressing
Power realizes waterproof sealing.
After tested, 110kV moulded insulating joint does not puncture under each 10 lightning impulses of 605kV positive-negative polarity, in work
15min does not puncture under frequency pressure resistance 176kV, and the shelf depreciation more than background (1.6pC), electric property are not detected at 106kV
Better than related request in standard GB/T 11017.3-2014 and IEC60840:2004.
Embodiment 2
Make YJLW03-Z-127/220KV 1*800mm2The method of cross-linked polyethylene insulated cable moulded insulating joint, first
Purification room and workbench are built at the scene, is then carried out according to standard operation guiding book, and specific steps include:
1) cable stripping and pretreatment: layer-by-layer stripping is carried out to cable end according to drawing requirement, is inserted in insulated copper shell in advance, so
Cable is pre-processed afterwards, the pretreatment includes but is not limited to the corrugated aluminum sheath surface clean of cable, by the wrinkle
Line aluminum sheath end port is pulled back horn-like and removes flash removed, the corrugated aluminum sheath transition leads is coated to one layer " bottom lead ", is right
The heating alignment of cable connection end cuts cable insulation and polishes cable insulation layer surface.
2) conductor welds: after cable conductor uses the centering of conductors dedicated weld holder, layering carries out silver brazing and connects, every layer of welding
Conductor pad after complete is required to carry out polishing with 800 mesh sand paper and be cleaned with cable cleaning paper, and each layer of institute
It states conductor weld locations all to mutually stagger, until isometrical recovery cable conductor.
3) conductor shielding molds: the wrapped semiconductive nylon tape 2 one of half lap first on the outside of the cable conductor restored
Layer, then wrapped prefabricated cross-linking two layers of EVA semi-conductive tape of half lap, is subsequently mounted the metal with heating function and presses mold, leads to
It crosses program and is warming up to 150 DEG C, and keep 30min, make cable body conductor shielding and connector conductor shield 3 is cross-linked with each other combination
It is integrated, after room temperature, removes the metal and press mold, the surface after crosslinking is carried out with 1200 mesh sand paper
Fine polishing, the nylon tape 22 prevent in the insertion of connector conductor shield 3 cable conductor in the production process.
4) template splice insulation main body I section 4 molds: successively installation template A20 on the surface after polishing, template B21,
Template C22 and metal die 23, wherein the template A20 is equipped with template injecting hole 27, the built-in heating of the metal die 23
Device is simultaneously equipped with the first mold injection hole 28, the second mold injection hole 29 and third mold injection hole 30, the first mold note
Mole 28 is aligned with the template injecting hole 27, second mold injection hole 29 and third mold injection hole 30 respectively with
The template B21 is connected with the template C22, and process control requires after reaching 140 DEG C according to heating curve, is squeezed by small-sized
The crosslinkable polyethylene material of molten condition is squeezed into the template A20, institute by first mold injection hole 28 by machine out
It states in the cavity that template B21 and the cable body are surrounded, when pressure reaches 3.0MPa, stops after keeping pressure 30min
Heating.
5) template splice insulation shielding I section 6 molds: when after naturally cool to 60 DEG C, opening the metal die 23, tears open
Except the template A20, molding splice insulation main body I section 4 such as is cut and polished at the surface treatment, the gold is installed again
Belong to mold 23, process control requires after reaching 125 DEG C according to heating curve, by small-sized extruder by cross-linking EVA semiconductive
Material squeezes into the splice insulation main body I section 4, the template B21 and the metal by first mold injection hole 28
In the cavity that mold 23 is surrounded, when pressure reaches 2.5MPa, stop heating after keeping pressure 30min.
6) template splice insulation main body II section 5 molds: when after naturally cool to 60 DEG C, the metal die 23 is opened,
Remove the template B21；Molding splice insulation shielding I section 6 such as is cut and is polished at the surface treatment, install again described in
Metal die 23, process control requires after reaching 125 DEG C according to heating curve, by small-sized extruder by crosslinkable polyethylene material
Material squeezes into the splice insulation main body I section 4 by second mold injection hole 29, the splice insulation shields I section 6, institute
It states in the cavity that template C22 and the metal die 23 are surrounded, when pressure reaches 2.0MPa, stops after keeping pressure 20min
Only heat.
7) template splice insulation shielding II section 7 molds: when after naturally cool to 60 DEG C, the metal die 23 is opened,
The template C22 is removed, molding splice insulation main body II section 5 such as is cut and polished at the surface treatment, institute is installed again
State metal die 23, process control requires after reaching 125 DEG C according to heating curve, by small-sized extruder by cross-linking EVA half
Conductive material squeezes into 23 institute of the splice insulation main body II section 5 and the metal die by third mold injection hole 30
In the cavity surrounded, when pressure reaches 2.0MPa, stop heating after keeping pressure 30min.
8) vulcanize: when after naturally cool to 60 DEG C, opening the metal die 23, II sections are shielded to molding splice insulation
7 the surface treatment such as are cut and are polished, and are installed the metal die 23 again, are passed through in first mold injection hole 28 resistance to
It presses rubber tube to connect dry high purity nitrogen bottle pressure reducing valve, gas gauge is installed in second mold injection hole 29, described
Exhaust valve is installed in third mold injection hole 30, is filled with nitrogen by first mold injection hole 28, heated for controlling temperature is maintained at 240
DEG C, pressure is maintained at 4MPa, stops heating after carrying out vulcanization crosslinking 12 hours, so that the cable body, the splice insulation
Main body I section 4, splice insulation shielding I section 6, the splice insulation main body II section 5 and splice insulation shielding II section 7 are each
It is cross-linked with each other and is combined into one between layer.
9) degasification: when being cooled to 80 DEG C, opening the exhaust valve, is persistently filled with from first mold injection hole 28 dry
Dry high pure nitrogen, and temperature is kept to stablize at 80 DEG C, degasification process is carried out, stops heating after continuing 48 hours, is continually fed into dry
Dry high pure nitrogen opens the metal die 23 after being cooled to room temperature to adapter body.
10) strip lap: I section 6 is shielded in the splice insulation and splice insulation shielding 7 outside half lap of II section is wrapped
Semi-conductive buffer water-blocking band 9, two 9 middle wares of semi-conductive buffer water-blocking band are partly led with the cable body away from for 30cm
Electric buffer water-blocking band 9 is overlapped 15cm, then the wrapped thin sheet lead band 10 of half lap and the corrugated aluminum sheath weight with the cable body
Folded 20cm, the thin sheet lead band 10 and corrugated aluminum sheath tighten fixation with thin copper wire, then in adapter body middle position half lap
Wrapped six layers of non-linear stress controls band 11, semi-conductive buffer water-blocking band 9 described in the non-linear stress control band 11 and two sides
It is overlapped 15cm, finally in the wrapped six layer of first waterproof insulation self-adhesive tape 12 of entire connector exterior half lap, the semi-conductive buffer resistance
There are gauffers for preventing thin 10 inner surface of sheet lead band to damage the splice insulation shielded layer, the thin lead for water band 9
Belt 10 is soft, can reduce the damage to the splice insulation shielded layer, the thin sheet lead band compared to other metals
10 match with the semi-conductive buffer water-blocking band 9, play dual protective effect.
11) insulated copper shell is installed: the insulated copper shell is made of the first plastic copper shell 13 and the second plastic copper shell 14, described
First plastic copper shell 13 and the second plastic copper shell 14 are separately mounted to the two sides of the adapter body, the first plastic copper shell
It is fixed by screw between 13 and the second plastic copper shell 14 and dead ring 16 is installed, the first plastic copper shell 13 and described
Second plastic copper shell 14 is connect with the wrinkle lead sheath 1 at cable conductor both ends by lead sealing 18, is installed on the outside of the lead sealing 18
First heat-shrinkable T bush 19, institute of the lead sealing 18 for the described first plastic copper shell 13 and second plastic the copper shell 14 and both ends
Sealing and fixing between wrinkle lead sheath 1 is stated, first heat-shrinkable T bush 19 not only plays protection to the lead sealing 18 and makees
With, while being fixedly connected for the described first plastic copper shell 13 and the second plastic copper shell 14 and cable surface.
The two sides of the dead ring 16 are tightly around wrapping sealing joint strip 31, the sealing joint strip 31 and the described first plastic copper
Shell 13 is connected with the described second plastic 14 surface of copper shell, is also closely surrounded on the dead ring 16 and the sealing joint strip 31
Second waterproof insulation self-adhesive tape 32 installs the second heat-shrinkable T bush 33 on the outside of the second waterproof insulation self-adhesive tape 32, thus complete
At the assembling of the insulated copper shell, second heat-shrinkable T bush 33 has not only acted as protective effect, while providing and uniformly pressing
Power realizes waterproof sealing.
After tested, 220kV moulded insulating joint does not puncture under each 10 lightning impulses of 1155kV positive-negative polarity, in work
15min does not puncture under frequency pressure resistance 280kV, and the shelf depreciation more than background (2.0pC), electric property are not detected at 209kV
Better than related request in standard GB/Z 18890.3-2002 and IEC62067:2011.
The material of the template A20, the template B21 and the template C22 are high temperature polymeric materials, the present embodiment
In, the material of the template A20, the template B21 and the template C22 are silicon rubber, polyurethane or nitrile rubber.
Ground line copper pipe 15, first packet are equipped on the first plastic copper shell 13 and the second plastic copper shell 14
It is identical with the nozzle direction of the ground line copper pipe 15 on the described second plastic copper shell 14 to mould copper shell 13, the first plastic copper
Between shell 13 and the second plastic copper shell 14 with sealing ring 17, the sealing ring are installed in the contact surface of the dead ring 16
17 for the sealing between the described first plastic copper shell 13, the second plastic copper shell 14 and the dead ring 16.
The template A20 is equipped with template extended segment 26, and the template extended segment 26 is parallel with the template C22, institute
It states and is respectively equipped with the first link slot 24 and the second link slot 25 on template B21, first link slot 24 is connect with described second
Slot 25 is matched with the template A20 and the template C22 respectively, since splice insulation shielded layer cannot connect in the fabrication process
It is continuous, so using the template A20, the template B21 and the template C22 of special shape, so that the splice insulation master
Body I section 4, the splice insulation main body II section 5, the splice insulation shielding I section 6 and the splice insulation shield II section 7 with
Every mode be configured.
Compared with prior art, a kind of manufacturer of high-voltage cross-linked polyethylene sheathed moulded insulating joint of the present invention
Method, the manufacturing method abandon original Integral prefabricated type connector, are molded using material identical as cable body and restore conductor shielding
Physical interface is not present in layer, insulating layer and insulation screen, and it is integrated with cable major insulation to realize connector major insulation, makes
It is not affected by thermal expansion and contraction, and waterproof performance is good, and electric field and heterogeneity phantom are uniform and stable, and excellent electric properties, service life is held
Long, it can be moved, be carried and normal cable drum after connector completes, the joint structure after completing is compact, ruler
It is very little small, it occupies little space, can satisfy the arrangement in narrow work well, to reduce capital construction cost.
The splice insulation shielded layer uses geometry method (by the splice insulation screen after electrically disconnecting
The extended segment is arranged in the cut-off part for covering layer, forms zero potential horn-like, improves the electric field of the splice insulation shielded layer
Distribution) and parameters control method (using non-linear stress control band made of non-linear resistance material, around the connector
On insulation screen cut-off part, improve the problems in stress collection at this) carry out shielding port at electric stress improve so that electric field
Distribution and electric field strength are in optimum state, to improve product reliability of operation and service life.
In the description of the present invention, it should be noted that the instruction such as term " on ", "lower", "left", "right", "inner", "outside"
Orientation or positional relationship be based on orientation or positional relationship described in attached drawing or the invention product using when usually put
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint, which is characterized in that specific steps
Include:
1) cable stripping and pretreatment: layer-by-layer stripping is carried out to cable end according to drawing requirement, is inserted in insulated copper shell in advance, so
Cable is pre-processed afterwards；
2) conductor welds: after cable conductor uses the centering of conductors dedicated weld holder, layering carries out silver brazing and connects, after every layer has been welded
Conductor pad require to carry out polishing with 800 mesh sand paper and be cleaned with cable cleaning paper, and each layer described is led
Body weld locations all mutually stagger, until isometrical recovery cable conductor；
3) conductor shielding molds: one layer of the wrapped semiconductive nylon tape of half lap first on the outside of the cable conductor restored, so
Prefabricated cross-linking two layers of EVA semi-conductive tape of half-lap packet afterwards, is subsequently mounted the metal with heating function and presses mold, pass through program
140 DEG C ~ 180 DEG C are warming up to, and keeps 30min, makes cable body conductor shielding and connector conductor shield is cross-linked with each other combination
It is integrated, after room temperature, removes the metal and press mold, the surface after crosslinking is carried out with 1200 mesh sand paper
Fine polishing；
4) I sections of template splice insulation main body moldings: successively installation template A, template B, template C and gold on the surface after polishing
Belong to mold, wherein the template A is equipped with template injecting hole, heating device built in the metal die is simultaneously equipped with the first mold note
Mole, the second mold injection hole and third mold injection hole, first mold injection hole are aligned with the template injecting hole, institute
It states the second mold injection hole and third mold injection hole to be connected with the template B and the template C respectively, process control
It is required after reaching 130 DEG C ~ 140 DEG C according to heating curve, by small-sized extruder by the crosslinkable polyethylene material of molten condition
The template A is squeezed into, in the cavity that the template B and the cable body are surrounded by first mold injection hole,
When pressure reaches 1.5 ~ 3.0MPa, stop heating after keeping 15 ~ 30min of pressure；
5) template splice insulation shields I sections of moldings: when after naturally cool to 50 DEG C ~ 60 DEG C, opening the metal die, removes
The template A installs the metal mold to I sections of the molding splice insulation main body surface treatments such as cut and polished again
Tool, process control requires after reaching 115 DEG C ~ 125 DEG C according to heating curve, by small-sized extruder by cross-linking EVA semiconductive
Material squeezes into I sections of the splice insulation main body, the template B and metal die institute by first mold injection hole
In the cavity surrounded, when pressure reaches 1.0 ~ 2.5MPa, stop heating after keeping 15 ~ 30min of pressure；
6) II sections of template splice insulation main body moldings: when after naturally cool to 50 DEG C ~ 60 DEG C, the metal die is opened, is torn open
Except the template B；It I section are shielded to molding splice insulation is cut and is polished etc. and be surface-treated, the metal is installed again
Mold, process control requires after reaching 115 DEG C ~ 125 DEG C according to heating curve, by small-sized extruder by crosslinkable polyethylene material
Material squeezes into I sections of the splice insulation main body by second mold injection hole, the splice insulation shields I sections, the mould
In the cavity that plate C and the metal die are surrounded, when pressure reaches 1.0 ~ 2.5MPa, stop after keeping 15 ~ 30min of pressure
Heating；
7) template splice insulation shields II sections of moldings: when after naturally cool to 50 DEG C ~ 60 DEG C, opening the metal die, tears open
Except the template C, to II sections of the molding splice insulation main body surface treatments such as cut and polished, the metal is installed again
Mold, process control require after reaching 115 DEG C ~ 125 DEG C according to heating curve, are partly led cross-linking EVA by small-sized extruder
Electric material by third mold injection hole squeezes into II sections of the splice insulation main body and the metal die is surrounded
In cavity, when pressure reaches 1.0 ~ 2.5MPa, stop heating after keeping 15 ~ 30min of pressure；
8) vulcanize: when after naturally cool to 50 DEG C ~ 60 DEG C, opening the metal die, II sections are shielded to molding splice insulation
It the surface treatment such as is cut and is polished, the metal die is installed again, passes through pressure-resistant rubber in first mold injection hole
Sebific duct connects dry high purity nitrogen bottle pressure reducing valve, gas gauge is installed in second mold injection hole, in the third mould
Having injecting hole and exhaust valve is installed, nitrogen is filled with by first mold injection hole, heated for controlling temperature is maintained at 220 DEG C ~ 240 DEG C,
Pressure is maintained at 2 ~ 4MPa, stops heating after carrying out vulcanization crosslinking 4 ~ 12 hours, so that the cable body, the splice insulation
I sections of main body, the splice insulation shield I section, II sections of each layers of II sections of the splice insulation main body and splice insulation shielding it
Between be cross-linked with each other and be combined into one；
9) degasification: when being cooled to 70 DEG C ~ 80 DEG C, opening the exhaust valve, is persistently filled with from first mold injection hole dry
Dry high pure nitrogen, and temperature is kept to stablize at 70 DEG C ~ 80 DEG C, degasification process is carried out, stops heating after continuing 12 ~ 48 hours, holds
Continuous be passed through after dry high purity nitrogen is cooled to room temperature to adapter body opens the metal die；
10) strip lap: I sections are shielded in the splice insulation and the splice insulation shields the wrapped semiconductive of half lap on the outside of II sections
Buffer water-blocking band, the two semi-conductive buffer water-blocking band middle wares away from for 10 ~ 30cm, and with the cable body semi-conductive buffer
Waterstop is overlapped 15cm, then the wrapped thin sheet lead band of half lap and 20cm Chong Die with the corrugated aluminum sheath of the cable body, institute
It states thin sheet lead band and corrugated aluminum sheath and tightens fixation with thin copper wire, it is then non-thread at wrapped six layers of adapter body middle position half lap
Property stress control belt, the non-linear stress controls band 15cm Chong Die with semi-conductive buffer water-blocking band described in two sides, finally whole
A wrapped six layer of first waterproof insulation self-adhesive tape of connector exterior half lap；
11) insulated copper shell is installed: the insulated copper shell is made of the first plastic copper shell and the second plastic copper shell, and described first is plastic
Copper shell and the second plastic copper shell are separately mounted to the two sides of the adapter body, the first plastic copper shell and second packet
It is fixed by screw between modeling copper shell and dead ring is installed, the first plastic copper shell and the second plastic copper shell are led with cable
The wrinkle lead sheath at body both ends is connected by lead sealing, installs the first heat-shrinkable T bush on the outside of the lead sealing, and the two of the dead ring
Side is connected tightly around sealing joint strip, the sealing joint strip is wrapped with the described first plastic copper shell and second plastic copper shell surface
It connects, the second waterproof insulation self-adhesive tape, second waterproof insulation is also closely surrounded on the dead ring and the sealing joint strip
The second heat-shrinkable T bush is installed on the outside of self-adhesive tape, to complete the assembling of the insulated copper shell.
2. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 1,
It is characterized by: the pretreatment includes but is not limited to the corrugated aluminum sheath surface clean of cable, by the corrugated aluminum sheath
It pulls back horn-like and removes flash removed, the corrugated aluminum sheath transition leads coated to one layer " bottom lead ", to cable connection in port
The heating alignment at end cuts cable insulation and polishes cable insulation layer surface.
3. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 1,
It is characterized by: the material of the template A, the template B and the template C are high temperature polymeric materials.
4. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 3,
It is characterized by: the material of the template A, the template B and the template C are silicon rubber, polyurethane or nitrile rubber.
5. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 1,
It is characterized by: being equipped with ground line copper pipe on the first plastic copper shell and the second plastic copper shell.
6. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 5:
The first plastic copper shell is identical with the nozzle direction of the ground line copper pipe on the described second plastic copper shell.
7. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 1,
It is characterized by: between the first plastic copper shell and the second plastic copper shell be equipped in the contact surface of the dead ring
Sealing ring.
8. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 1,
It is characterized by: the template A is equipped with template extended segment, the template extended segment is parallel with the template C.
9. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 1,
It is characterized by: being respectively equipped with the first link slot and the second link slot on the template B.
10. a kind of manufacturing method of high-voltage cross-linked polyethylene sheathed moulded insulating joint according to claim 9,
It is characterized by: first link slot is matched with the template A and the template C respectively with second link slot.
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| CN115133467A (en) * | 2022-06-29 | 2022-09-30 | 宁波东方电缆股份有限公司 | Manufacturing process of extra-high voltage direct current 800kV cable wrapping fusion type soft joint |
| CN115160536A (en) * | 2022-07-12 | 2022-10-11 | 国网上海市电力公司 | High-voltage cable terminal sealing method |
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| CN115133467A (en) * | 2022-06-29 | 2022-09-30 | 宁波东方电缆股份有限公司 | Manufacturing process of extra-high voltage direct current 800kV cable wrapping fusion type soft joint |
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| CN115160536B (en) * | 2022-07-12 | 2023-09-12 | 国网上海市电力公司 | High-voltage cable terminal sealing method |
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Effective date of registration: 20220117 Address after: 215500 No.8, Tongda Road, Changshu Economic Development Zone, Suzhou City, Jiangsu Province Patentee after: Hengtong Submarine Power Cable Co.,Ltd. Patentee after: JIANGSU HENGTONG WIRE&CABLE TECHNOLOGY Co.,Ltd. Address before: 215500 No.8, Tongda Road, Changshu Economic Development Zone, Suzhou City, Jiangsu Province Patentee before: Hengtong Submarine Power Cable Co.,Ltd. |
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