CN106329268B - The wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint - Google Patents
The wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint Download PDFInfo
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- CN106329268B CN106329268B CN201610681847.XA CN201610681847A CN106329268B CN 106329268 B CN106329268 B CN 106329268B CN 201610681847 A CN201610681847 A CN 201610681847A CN 106329268 B CN106329268 B CN 106329268B
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- Prior art keywords
- cable
- transition joint
- insulating barrier
- layer
- wrapped
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/005—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for making dustproof, splashproof, drip-proof, waterproof, or flameproof connection, coupling, or casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
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- Manufacturing & Machinery (AREA)
- Processing Of Terminals (AREA)
Abstract
The invention provides a kind of wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint, comprise the following steps：Step a. removes oversheath, the metallic sheath of the end cable of transition joint two, retains the buffer strip that blocks water；Step b. cables pre-process；Step c. welding conductors cores；Semi-conductive layer in step d. recoveries:Semi-conductive layer port in cleaning, the then wrapped semiconductive band on conductor；Step e. recovers insulating barrier；Step f. recovers outer semiconducting layer.The preparation method of the present invention is easy to operate, and made transition joint forms integrative-structure with cable body；Electric field stress is evenly distributed, electric performance stablity, solves between cable and transition joint, because material is different and caused by active interface, avoid space stored charge cause insulating barrier internal field distort caused by cable intermediate joint breakdown problem.
Description
Technical field
The present invention relates to the technology set by cross-linked polyethylene insulated cable transition joint, suitable for 500V to 48kV
The live wrapped molding preparation method of twisted polyethylene cable transition joint.
Background technology
Traditional 500V to the cable connector of 48kV power cable with cross-linked polyethylene insulations middle part be transition joint, it is middle
Joint conductor continues using conductor crimping, and the mode of further insulating medium carries out the connection of cable and continued, and electric field can produce
Raw distortion, in order to overcome influence caused by electric field distortion, stress need to be carried out at cable intermediate joint main body cable conductor crimping
Pipe designs, and cable inner semiconducting layer cut-off part needs to carry out stress cone design.
So far, it is whole international in the cable between joint this technical field have sizable achievement, respective design
Annex has also put goods on the market, the Stress Control in these annexes, is that production is completed in advance in factory by specialized factory, i.e., prefabricated
Formula cable accessory, then on live combined complete at the scene to cable main.This prefabricated type cable accessory, because of the knot of itself
Structure problem, the distortion field strength that uniform cable is concentrated can only be weakened and be unable to reach the Electric Field Distribution state naturally equivalent with former cable
The distortion of cable field strength is eliminated, and can not solve the problems, such as coordinates interface air gap between a variety of dielectrics, active interface includes
There are the complicated factors such as Wei air gap, Wei Shui, impurity and insulation lubricating grease, easily cause air gap creeping discharge and spatial summation electric charge
And internal field's distortion is produced, insulation breakdown is ultimately resulted in, governs the safe operation of cable system.
In view of the above-mentioned problems, to provide a kind of construction is simple, cost cheap, safe and reliable crosslinked polyetylene insulated by the present invention
The wrapped molding preparation method of cable intermediate joint.
The content of the invention
In order to solve problem in the prior art, the invention provides a kind of power cable with cross-linked polyethylene insulation transition joint
Wrapped molding preparation method, comprises the following steps：
Step a. removes oversheath, the metallic sheath of the end cable of transition joint two, retains the buffer strip that blocks water；
Step b. cables pre-process：
Handle outer semiconducting layer：Outer semiconducting layer fracture is vertical with cable axis, smooth, outer semiconducting layer incision position knife
Groove is cut out, pvc adhesive tapes are wound on the insulating barrier of adjacent outer semiconducting layer fracture, groove is polishing to smoothly with sand paper, made
Its even transition is the rounding conical surface, releases pvc adhesive tapes；
Handle insulating barrier：First insulating barrier fracture is exploited into pencil head shapes according to process, with the sand of different size
Paper polishes flat cable insulation layer surface smooth, must not carry cut and conductive particle；
Semi-conductive layer in processing：Semi-conductive layer position in exploitation sizing, retains semiconductive band position dimension, protects and beats
After the cable surface processing position of milled, conductor thread core bundle side paper is buckled with blade of carving knife and pulled out, does not have exposed copper core section
With the presence of side paper is pricked, with pvc adhesive tape reverse side bag good port in fact, part is inserted in:Heat-shrink tube, connector portions are inserted in successively in two sections of cables
Part；
Step c. welding conductors cores；
Semi-conductive layer in step d. recoveries:Semi-conductive layer port and conductor in cleaning, then wrapped semiconductive band；
Step e. recovers insulating barrier；
Step f. recovers outer semiconducting layer.
As a further improvement on the present invention, the step a also includes the metallic sheath surface of cable removing removing oxide layer.
As a further improvement on the present invention, the step b, when handling outer semiconducting layer：Outer semiconducting layer fracture knife
Groove is cut out, edge of a knife direction is towards outer semiconducting layer, 3 layers of pvc adhesive tapes of winding on the insulating barrier of adjacent outer semiconducting layer fracture,
With 600# sand paper polishing groove to flat smooth.
As a further improvement on the present invention, the step b, when handling insulating barrier：First by size exploitation sizing, then use
240# sand paper polishing cable insulation layer surface makes its essentially smooth, then is polished insulating barrier with 600# sand paper, should not in bruting process
Break and quickly move sand paper in axial direction and peripheral direction, it is first with sheet glass or wider sand paper when surface of insulating layer has larger concavo-convex
Polished again after doing partial trim.
As a further improvement on the present invention, the step b, semi-conductive layer in processing：First with 240# sand paper polishing cable
Insulating barrier, may be seen indistinctly interior semi-conductive layer when again with 600# sand paper polish, make its essentially smooth, without obvious cut and conduction
Particle.
As a further improvement on the present invention, the step c. welding conductors cores:Make end cable of transition joint two or so,
Parallel in same level up and down, firm supporting is not walked, not rocked, the concentricity phase of the end cable concentric shafts of transition joint two
Difference can not be more than 0.2mm, be then ready for all soldering appliances, mould, welding powder, cooler, smog cap, adjust transition joint two
After the distance of end line core section mouth, erecting and welding mould, make weld mold perpendicular to the end cable of transition joint two, cable incision position
In weld mold center position, weld mold is locked, configures the welding powder of respective cable specification, in weldering mould pod apertures upper ends gold
Category piece, igniting welding, cooling form removal, polishing cable conductor recovery core are isometrical.
As a further improvement on the present invention, the step e. recovers insulating barrier:To the cable inner semiconducting layer handled
And at the former cable insulation layer surface after exploitation processing, using the crosslinked polyetylene insulated vulcanization of material identical with cable insulation
Band, after carrying out wrapped recovery, insulating barrier former and controller unit are installed, preheating, which reaches, can make crosslinked polyetylene insulated vulcanization band
During 170 DEG C of melting temperature, maintain 45 minutes stipulated times to be crosslinked, make factory's insulating barrier, interior semi-conductive layer with being crosslinked poly- second
Alkene insulating sulfuration band is melted into an insulating barrier entirety, is removed after the cooling of insulating barrier former temperature, then cuts type polishing,
The type of cutting will cut type polishing, surface of insulating layer and outer semiconductive according to the principle that insulating barrier external diameter Φ is 6mm ＜ Φ ＜ 8mm
Layer segment will finely polish, and insulating barrier and outer semiconducting layer transition will smooth out, the trade mark of Sand paper for polishing must it is ascending successively
Use, if there is depression on surface of insulating layer, it is necessary to recess is expanded into polishing up and down, seamlessly transits the depression.
As a further improvement on the present invention, the step f. recovers outer semiconducting layer：Outer partly the leading of cable wherein one end
Semiconductive varnish is uniformly smeared at electric layer port, then is smeared to the joint other end, after natural air drying, then uniformly smears semiconductive varnish,
Uniformly smear totally 3 times, natural air drying waits subsequent processing to make.
The beneficial effects of the invention are as follows：The preparation method of the present invention is easy to operate, made transition joint and cable sheet
The bodily form is into a single integrated structure；The electric performance stablity of electric field stress distribution, is solved between cable and transition joint, because of material difference
Caused active interface, space stored charge is avoided to cause hitting for cable intermediate joint caused by the distortion of insulating barrier internal field
Wear problem.The present invention breaks through 500V to the international technical bottleneck in the industry of 48kV twisted polyethylene cable transition joints, is applied to
500V is made to 48kV twisted polyethylene cable transition joints engineering site, the demand of breakdown repair.
Conductor uses exothermic weld, and the pull-off force of wire weld and the ratio of body are 91.2 ﹪, its current capacity with
Wire is equal, and mechanical performance is similar to cable conductor, pad never aging, can bear repeated fault current impact；
Copper core welding, insulating body melt binding is integral, and molding joint cable is flexible, is dragged without having to worry about cable
It is dynamic to cause stress cone to shift；
Insulation recovers using with cable insulation identical XLPE, makes molding insulation with cable insulation without interface melt binding,
The entirety consistent with cable is formed in structure and consistent with former cable without obvious joint characteristic, dielectric strength, with higher
Electric insulation and stable endurance quality；
Insulating body is good without interface, water resistance；
Construction environment requires unlimited to temperature humidity；
Appearance and size and outside diameter of cable approximately equal, and the specific position of cable bend can be produced on, it is not take up too many sky
Between.
Brief description of the drawings
Fig. 1 is construction of cable schematic diagram of the present invention.
Each component names are as follows in figure：
Outer semiconductive layer 1, insulating barrier 2, interior semi-conductive layer 3, conductor 4.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
500V makes method to the wrapped molding of 48kV twisted polyethylene cable transition joints, comprises the following steps：
Step a. requires according to manufacture craft, removes oversheath, the metallic sheath of the end cable of transition joint two, and reservation blocks water slow
Rush band；The metallic sheath surface clean of cable is clean, and file file in metallic sheath port removes corner burr.
Step b. cables pre-process：
Outer semiconductive layer surface treatment：Outer semiconductive layer fracture should be vertical with cable axis, smooth, outer semiconductive layer incision position 30mm
In the range of with knife cut out groove (edge of a knife direction towards outer semiconductive layer, in order to avoid incised wound insulating barrier), adjacent outer semiconductive layer fracture is exhausted
3 layers of pvc adhesive tapes are wound in edge layer, groove is polished to smooth with 600# sand paper, it be the rounding conical surface to make its even transition, releasing pvc
Adhesive tape.
Surface of insulating layer processing：First shaped by size exploitation, then make its base with 240# sand paper polishing cable insulation layer surface
This is smooth, then is polished insulating barrier with 600# sand paper, makes surface of insulating layer without obvious cut and conductive particle.(bruting process
In constantly should quickly move sand paper in axial direction and peripheral direction, avoid that to form insulating surface recessed in local location polishing for a long time
Fall into, such as when surface of insulating layer has larger concavo-convex, polished again after can first doing partial trim with sheet glass or wider sand paper).Finally
Insulating barrier polish to flat smooth.
Interior semi-conductive layer surface treatment：Semi-conductive layer position in exploitation sizing, retains semiconductive band position dimension.(note
3：First with 240# sand paper polishing cable insulation, may be seen indistinctly interior semi-conductive layer when again with 600# sand paper polishing make its light substantially
Sliding, without obvious cut and conductive particle) protect the cable surface processing position polished after, with blade of carving knife conductor
Core pricks side paper and buckles and pulls out, and exposed copper core section is not pricked side paper and exists, with PVC tape reverse side bag good port in fact.It is inserted in
Part:The joint component such as heat-shrink tube, dust-proof barrier part for the specification of works that is consistent is inserted in successively in two sections of cables.
Step c. conductor thread cores weld:Make two end cables or so, upper and lower parallel in same level, firm supporting is not walked
Position, do not rock, two end cable concentric shafts difference can not be more than 0.2mm.It is then ready for all soldering appliances, mould, welding powder, drop
Warm device, cooling device, smog cap.After the distance for adjusting both ends core section mouth, weld mold is installed in time perpendicular to level
Two end cable fractures on, be evenly distributed fixed installation weld mold, make weld mold perpendicular to the end cable of transition joint two, electricity
Cable fracture is in weld mold center position, locks weld mold.The welding powder of respective cable specification is configured, in weldering mould pod apertures
Place sheet metal in end.Igniting welding, cooling form removal, polishing cable conductor recovery core are isometrical.(note 5：Weld metal answers fine and closely woven nothing
The defects of crackle, slag inclusion and surface pores)
Step d. is partly led in recovering:Semiconductive port and conductor are cleaned, then wrapped semiconductive band.
Step e. recovers insulating barrier:At factory's insulating surface of external screen at former cable inner shield and stripping, use and cable
Insulate the crosslinked polyetylene insulated vulcanization band of identical material, after carrying out wrapped recovery, by dress insulation former and controller unit, in advance
Heat reaches when can make crosslinked polyetylene insulated 190 DEG C of melting temperature of vulcanization band, maintains 1 hour of stipulated time to be crosslinked, makes
Factory's insulation, inner shield and crosslinked polyetylene insulated vulcanization band are melted into an insulation entirety, and former temperature to be insulated is cold
But remove afterwards, then cut type polishing.The type of cutting will cut type polishing according to the principle that outer insulation diameter Φ is 6mm ＜ Φ ＜ 8mm,
Insulating surface and external shield partial cables will finely polish, and insulation and external shield transition will smooth out.The trade mark of Sand paper for polishing is necessary
It is ascending to use successively.If there is depression in insulating surfaces, it is necessary to recess is expanded into polishing up and down, makes the depression smoothed
Cross.
Step f., which recovers outer, partly to be led (external screen)：Semiconductive varnish is uniformly smeared at the semiconductive port of cable wherein one end, then
Semiconductive varnish is uniformly smeared after smearing natural air drying to the joint other end again uniformly to smear totally 3 times, natural air drying waits next work
Sequence makes.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (8)
- A kind of 1. wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint, it is characterised in that：Comprise the following steps：Step a. removes oversheath, the metallic sheath of the end cable of transition joint two, retains the buffer strip that blocks water；Step b. cables pre-process：Handle outer semiconducting layer：Outer semiconducting layer fracture is vertical with cable axis, smooth, and outer semiconducting layer incision position is cut out with knife Groove, pvc adhesive tapes are wound on the insulating barrier of adjacent outer semiconducting layer fracture, groove is polishing to smoothly with sand paper, makes its equal Even transition is the rounding conical surface, releases pvc adhesive tapes；Handle insulating barrier：First insulating barrier fracture is exploited into pencil head shapes according to process, will with the sand paper of different size Cable insulation layer surface polishes flat smooth, must not carry cut and conductive particle；Semi-conductive layer in processing：Semi-conductive layer position in exploitation sizing, retains semiconductive band position dimension, protects and polish Cable surface processing position after, conductor thread core is pricked side paper with blade of carving knife and buckles and pulls out, exposed copper core section is not pricked Side paper is present, and with pvc adhesive tape reverse side bag good port in fact, is inserted in part:Heat-shrink tube, joint component are inserted in successively in two sections of cables；Step c. welding conductors cores；Semi-conductive layer in step d. recoveries:Semi-conductive layer port and conductor in cleaning, then wrapped semiconductive band；Step e. recovers insulating barrier；Step f. recovers outer semiconducting layer.
- 2. the wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint according to claim 1, it is special Sign is：The step a also includes the metallic sheath surface of cable removing removing oxide layer.
- 3. the wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint according to claim 1, it is special Sign is：The step b, when handling outer semiconducting layer：Outer semiconducting layer fracture cuts out groove, edge of a knife direction direction outer half with knife Conductive layer, 3 layers of pvc adhesive tapes are wound on the insulating barrier of adjacent outer semiconducting layer fracture, groove is polished to smooth with 600# sand paper It is smooth.
- 4. the wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint according to claim 1, it is special Sign is：The step b, when handling insulating barrier：First by size exploitation sizing, then with 240# sand paper polish cable insulation layer surface Make its essentially smooth, then polished insulating barrier with 600# sand paper, constantly should quickly be moved in axial direction and peripheral direction in bruting process Sand paper, when surface of insulating layer has larger concavo-convex, polished again after first doing partial trim with sheet glass or wider sand paper.
- 5. the wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint according to claim 1, it is special Sign is：The step b, semi-conductive layer in processing：First with 240# sand paper polishing cable insulation, it is seen that during interior semi-conductive layer again Polished with 600# sand paper, make its essentially smooth, without cut and conductive particle.
- 6. the wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint according to claim 1, it is special Sign is：The step c. welding conductors cores:Make end cable of transition joint two or so, upper and lower parallel in same level, Firm supporting is not walked, not rocked, and the concentricity difference of the end cable concentric shafts of transition joint two can not be more than 0.2mm, Ran Houzhun Get all soldering appliances, mould, welding powder, cooler, smog cap ready, after the distance for adjusting transition joint both ends core section mouth, Erecting and welding mould, making weld mold, cable fracture is in weld mold center position perpendicular to the end cable of transition joint two, lock Tight weld mold, the welding powder of respective cable specification is configured, in weldering mould pod apertures upper ends sheet metal, igniting welding, cooling is torn open Mould, polishing cable conductor recovery core are isometrical.
- 7. the wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint according to claim 1, it is special Sign is：The step e. recovers insulating barrier:To the former cable insulation after the cable inner semiconducting layer handled and exploitation processing At layer surface, using the crosslinked polyetylene insulated vulcanization band of material identical with cable insulation, after carrying out wrapped recovery, installation is exhausted Edge layer former and controller unit, preheating reach when can make crosslinked polyetylene insulated 170 DEG C of melting temperature of vulcanization band, maintain regulation 45 minutes time was crosslinked, and factory's insulating barrier, interior semi-conductive layer and crosslinked polyetylene insulated vulcanization band is melted into one Insulating barrier is overall, is removed after the cooling of insulating barrier former temperature, then cuts type polishing, and the type of cutting will be according to insulating barrier external diameter Φ 6mm ＜ Φ ＜ 8mm principle is polished cut type, and surface of insulating layer and outer semiconducting layer part will finely polish, insulating barrier To be smoothed out with outer semiconducting layer transition, the trade mark of Sand paper for polishing ascending must use successively, if had on surface of insulating layer Depression, it is necessary to recess is expanded into polishing up and down, seamlessly transits the depression.
- 8. the wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint according to claim 1, it is special Sign is：The step f. recovers outer semiconducting layer：Semiconductive is uniformly smeared at the outer semiconducting layer port of cable wherein one end Paint, then smeared to the joint other end, after natural air drying, then semiconductive varnish is uniformly smeared, uniformly smeared totally 3 times, natural air drying etc. Treat that subsequent processing makes.
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| CN201610681847.XA CN106329268B (en) | 2016-08-17 | 2016-08-17 | The wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint |
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| CN201610681847.XA CN106329268B (en) | 2016-08-17 | 2016-08-17 | The wrapped molding preparation method of power cable with cross-linked polyethylene insulation transition joint |
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| CN106329268B true CN106329268B (en) | 2017-11-28 |
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| CN106848990B (en) * | 2017-01-13 | 2018-01-12 | 刘国晓 | A kind of docking calculation of 10kV twisted polyethylene cables |
| CN107123956A (en) * | 2017-05-15 | 2017-09-01 | 深圳科创新源新材料股份有限公司 | A kind of intermediate joint of electric cable welding and renovation technique |
| CN107465154B (en) * | 2017-08-24 | 2023-01-24 | 长园电力技术有限公司 | Insulation shielding isolation joint of crosslinked polyethylene cable and injection molding manufacturing process thereof |
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| CN108988230A (en) * | 2018-07-31 | 2018-12-11 | 国网福建省电力有限公司 | Cable semi-conductive fracture chamfered method |
| CN109286083A (en) * | 2018-09-28 | 2019-01-29 | 乐清市华仪电缆附件有限公司 | A kind of three-core cable welded joint and its mounting process |
| CN109616962A (en) * | 2018-12-21 | 2019-04-12 | 吴江市华鼎热缩制品有限公司 | A kind of hot melten type cable centre connection mounting process |
| CN109818161A (en) * | 2019-01-14 | 2019-05-28 | 和瑞达(广州)电力服务有限公司 | A kind of recovery 10kV and 27.5kV cable body melt connection method |
| CN110350376B (en) * | 2019-07-16 | 2020-04-21 | 长园电力技术有限公司 | Cross-linked polyethylene power cable intermediate connection joint and manufacturing method thereof |
| CN112234532A (en) * | 2020-11-04 | 2021-01-15 | 广东电网有限责任公司广州供电局 | Polypropylene 220kV molded cable connector and manufacturing method thereof |
| CN112952516A (en) * | 2021-01-29 | 2021-06-11 | 开封市欧迪电力设备工程有限公司 | High-voltage crosslinked polyethylene insulated cable joint modularization recovery method |
| CN113744932A (en) * | 2021-09-08 | 2021-12-03 | 黄石市深博电气有限公司 | Process method for recovering welding type cable outer semi-conductive layer |
| CN113937589B (en) * | 2021-11-05 | 2024-03-19 | 华能安阳能源有限责任公司 | Cable connection construction process |
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| US4056680A (en) * | 1975-04-11 | 1977-11-01 | Showa Electric Wire & Cable Co., Ltd. | Termination of d.c. high tension electric cables and method of manufacturing same |
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