CN102611067B - High-voltage cable flexible joint with non-linear shielding layers - Google Patents
High-voltage cable flexible joint with non-linear shielding layers Download PDFInfo
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- CN102611067B CN102611067B CN201210076093.7A CN201210076093A CN102611067B CN 102611067 B CN102611067 B CN 102611067B CN 201210076093 A CN201210076093 A CN 201210076093A CN 102611067 B CN102611067 B CN 102611067B
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Abstract
A high-voltage cable flexible joint with non-linear shielding layers relates to a high-voltage cable flexible joint and solves the problem that surface smoothness and roundness of inner and outer semiconductive shielding layers and insulating layers of high-voltage cable flexible joints in the existing structure are poor so that local electric field intensity is increased, electric branches are caused, the service life of the joint is shortened and the joint is even damaged. The high-voltage cable flexible joint with the non-linear shielding layers comprises an inner semiconductive shielding layer, a crosslinked polyethylene insulating layer, an outer semiconductive shielding layer, a semiconductive resistance water layer, a metal sheath and two cables. An integrally connected cable core is sequentially wrapped by the inner semiconductive shielding layer, the crosslinked polyethylene insulating layer, the outer semiconductive shielding layer, the semiconductive resistance water layer and the metal sheath from inside to outside. The flexible joint further comprises an inner non-linear shielding layer and an outer non-linear shielding layer, and the inner non-linear shielding layer is wrapped between the inner semiconductive shielding layer and the crosslinked polyethylene insulating layer. The high-voltage cable flexible joint with non-linear shielding layers is used for cable connection in the high voltage field.
Description
Technical field
The present invention relates to a kind of high-tension cable connecting hose.
Background technology
Dielectric property are good because having for cross-linked polyethylene insulated cable, transmission capacity is large, laying installation and the advantage such as operation maintenance is convenient, in high pressure, superhigh pressure field consumption cumulative year after year.Cable joint is the important component part of Voltage Cable Lines Construction, and its performance directly affects cable line reliability of operation and stability.High-voltage cross-linked polyethylene sheathed joint mainly contains two kinds of patterns: prefabricated joint and connecting hose, wherein connecting hose outside dimension and cable approach, and are mainly used in submarine cable and connect.
In the time that the insulation system of High Voltage XLPE Power Cable does not have defect, its inner maximum field intensity is always positioned at the surface that cable insulation contacts with inside and outside semiconductive shielding layer, and also this position is the weak part of high-voltage cable insulating.Obviously, the harm that the defect on cable insulation surface is brought may be more serious, and it can make local electric field strength further increase, and causes occurring partial discharge, causes electric branch, until cable XLPE insulation breakdown is destroyed.For avoiding occurring the defects such as projection, depression, impurity at High Voltage XLPE Power Cable insulating barrier and semi-conductive screen bed boundary, semi-conductive screen, XLPE insulation, the three-layer co-extruded technology of semi-conductive shield outside in all adopting in High Voltage XLPE Power Cable is produced at present, the XLPE insulating material using is ultra-clean high-voltage cable insulating material, and semi-conductive shielding material is the smooth high-tension cable semi-conductive shielding material of extruding.
In existing high-tension cable connecting hose manufacturing technology, interior semi-conductive screen, insulation and semi-conductive shield outside material in joint are identical with cable body material, can extrude by the wrapped post moulding of layering, crosslinking process or layering injection moulding, crosslinking process makes, each layer is connected with the respective layer of cable body respectively.High-tension cable connecting hose is field fabrication, first utilizes cutter to exploit " pencil stub " shape structure at two cable ends.As everyone knows, no matter take which kind of manual exploitation measure, all cannot ensure that the semiconductive shielding layer of exploiting out and surface of insulating layer reach the smooth degree of cable the first shielding and the first insulating surface.And then, be difficult to ensure that connecting hose inner semiconductor layer is connected smooth, rounding with insulating barrier with cable body corresponding construction, reach the smooth degree of each body structure surface in cable body.Thereby the defect that in existing structure high pressure XLPE insulated cable connecting hose, insulating surface exists, is the latency that causes high-voltage cable joint to destroy.Normal conditions, high-tension cable connecting hose is weakness in cable line, is the main generating region of line fault.
Summary of the invention
The object of the invention is inside and outside semiconductive shielding layer in order to solve existing structure high-tension cable connecting hose and surface of insulating layer smoothness and roundness poor, local electric field strength is increased, cause electric branch, cause the problem that the joint life-span reduces even to destroy.And then provide a kind of high-tension cable connecting hose with non-linear shielding layer.
The present invention addresses the above problem the technical scheme of taking to be: a kind of high-tension cable connecting hose with non-linear shielding layer of the present invention comprises inner semiconductor layer, crosslinked polyetylene insulated layer, out semiconductor layer, semiconductive water blocking layer, metallic sheath and two cables, every cable is by core, the first inner semiconductor layer, the first crosslinked polyetylene insulated layer, the first out semiconductor layer, the first semiconductive water blocking layer and the first metallic sheath form, the end of two cables is pencil capitiform structure, the core of exploitation place of two cables links into an integrated entity, the outside of the core linking into an integrated entity is coated with inner semiconductor layer successively by order from inside to outside, crosslinked polyetylene insulated layer, out semiconductor layer, semiconductive water blocking layer and metallic sheath, the two ends of inner semiconductor layer are respectively connected with corresponding the first inner semiconductor layer, the two ends of crosslinked polyetylene insulated layer are respectively connected with corresponding the first crosslinked polyetylene insulated layer, described connecting hose also comprises interior non-linear shielding layer and outer non-linear shielding layer, described interior non-linear shielding layer is coated between inner semiconductor layer and crosslinked polyetylene insulated layer, and the two ends of interior non-linear shielding layer are respectively connected with corresponding the first crosslinked polyetylene insulated layer, described outer non-linear shielding layer is coated between crosslinked polyetylene insulated layer and out semiconductor layer, and the two ends of outer non-linear shielding layer are respectively connected with corresponding the first out semiconductor layer, the two ends of out semiconductor layer are coated respectively the junction of outer non-linear shielding layer and the first out semiconductor layer, semiconductive water blocking layer is coated on the outside of out semiconductor layer and the outside of the first out semiconductor layer, and the two ends of semiconductive water blocking layer are respectively connected with corresponding the first semiconductive water blocking layer, the outside of semiconductive water blocking layer is coated with metallic sheath, the two ends of metallic sheath are respectively connected with corresponding the first metallic sheath.
The invention has the beneficial effects as follows: the material (conductivity is or/and the insulating material that relative dielectric constant changes with the change of electric field strength) of non-linear shielding layer of the present invention have stronger in non-uniform electric field the ability of homogenizing Electric Field Distribution voluntarily, the non linear coefficient of this non-linear insulating material is 0.5～10, connecting hose of the present invention is coated non-linear shielding layer in one deck between inner semiconductor layer and crosslinked polyetylene insulated layer, the outer non-linear shielding layer of coated one deck between crosslinked polyetylene insulated layer and outer half charged screen, can there is projection by the insulating surface in joint in non-linear shielding layer, when the rough defects such as depression, the Electric Field Distribution of homogenizing fault location, reduce maximum field intensity.Finite Element Method Simulation simulation result shows, there is semi-conductive screen projection or insulation projection in the semiconductive shielding layer of traditional structure high-tension cable connecting hose and XLPE interfacial dielectric layer place, there is semi-conductive screen projection in the non-linear shielding layer of high-tension cable connecting hose of the present invention and semiconductive shielding layer interface or non-linear shielding layer and XLPE interfacial dielectric layer place, when non-linear shielding projection or insulation projection, work as shape for lugs, when measure-alike, near maximum field intensity near the high-tension cable connecting hose inner process of the maximum field strength ratio structure of the present invention traditional structure high-tension cable connecting hose inner process is large more than 30%.Explanation thus, in connecting hose of the present invention, between inside and outside semiconductive shielding layer and insulating barrier, extruding respectively non-linear shielding layer contributes to the electric field suppressing because insulating surface defect (smooth poor with rounding degree) produces to concentrate, effectively reduce electric field strength, can effectively suppress the initiation of electric branch, the performance that has improved high-tension cable connecting hose, has extended useful life.
Brief description of the drawings
Fig. 1 is main sectional structure schematic diagram of the present invention.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1, a kind of high-tension cable connecting hose with non-linear shielding layer of present embodiment comprises inner semiconductor layer 13, crosslinked polyetylene insulated layer 11, out semiconductor layer 9, semiconductive water blocking layer 8, metallic sheath 7 and two cable I, every cable I is by core 4, the first inner semiconductor layer 5, the first crosslinked polyetylene insulated layer 6, the first out semiconductor layer 1, the first semiconductive water blocking layer 2 and the first metallic sheath 3 form, the end of two cable I is pencil capitiform structure, the core 4 of exploitation place of two cable I links into an integrated entity, the outside of the core 4 linking into an integrated entity is coated with inner semiconductor layer 13 successively by order from inside to outside, crosslinked polyetylene insulated layer 11, out semiconductor layer 9, semiconductive water blocking layer 8 and metallic sheath 7, the two ends of inner semiconductor layer 13 are respectively connected with corresponding the first inner semiconductor layer 5, the two ends of crosslinked polyetylene insulated layer 11 are respectively connected with corresponding the first crosslinked polyetylene insulated layer 6, described connecting hose also comprises interior non-linear shielding layer 12 and outer non-linear shielding layer 10, described interior non-linear shielding layer 12 is coated between inner semiconductor layer 13 and crosslinked polyetylene insulated layer 11, and the two ends of interior non-linear shielding layer 12 are respectively connected with corresponding the first crosslinked polyetylene insulated layer 6, described outer non-linear shielding layer 10 is coated between crosslinked polyetylene insulated layer 11 and out semiconductor layer 9, and the two ends of outer non-linear shielding layer 10 are respectively connected with corresponding the first out semiconductor layer 1, the two ends of out semiconductor layer 9 are coated respectively the junction of outer non-linear shielding layer 10 and the first out semiconductor layer 1, semiconductive water blocking layer 8 is coated on the outside of out semiconductor layer 9 and the outside of the first out semiconductor layer 1, and the two ends of semiconductive water blocking layer 8 are respectively connected with corresponding the first semiconductive water blocking layer 2, the outside of semiconductive water blocking layer 8 is coated with metallic sheath 7, the two ends of metallic sheath 7 are respectively connected with corresponding the first metallic sheath 3.
Interior non-linear shielding layer 12 described in present embodiment and the material of outer non-linear shielding layer 10 are the cross-linked polyolefin that is mixed with two or more mixtures in carborundum, zinc oxide, aluminium oxide, barium titanate, strontium titanates, zirconia titanate, carbon black, graphite, carbon fiber, carbon nano-tube.
Embodiment two: present embodiment is described in conjunction with Fig. 1, the two ends of the outer non-linear shielding layer 10 of present embodiment are respectively equipped with the first slope linkage section 10-1, and the end of each the first slope linkage section 10-1 is connected with corresponding the first out semiconductor layer 1.So arrange, effectively improve the mechanical performance of connecting hose, meet the design requirements and the actual needs.Other is identical with embodiment one.
Embodiment three: present embodiment is described in conjunction with Fig. 1, the two ends of the out semiconductor layer 9 of present embodiment are respectively equipped with the second slope linkage section 9-1, and the end of each the second slope linkage section 9-1 is coated respectively the junction of corresponding outer non-linear shielding layer 10 and the first out semiconductor layer 1.So arrange, effectively improve the mechanical performance of connecting hose, meet the design requirements and the actual needs.Other is identical with embodiment one or two.
Embodiment four: in conjunction with Fig. 1, present embodiment is described, the two ends of the semiconductive water blocking layer 8 of present embodiment are respectively equipped with the 3rd slope linkage section 8-1, the end of each the 3rd slope linkage section 8-1 is connected with corresponding the first semiconductive water blocking layer 2.So arrange, effectively improve the mechanical performance of connecting hose, meet the design requirements and the actual needs.Other is identical with embodiment one or two.
Embodiment five: in conjunction with Fig. 1, present embodiment is described, the two ends of the metallic sheath 7 of present embodiment are respectively equipped with the 4th slope linkage section 7-1, the end of each the 4th slope linkage section 7-1 is connected with corresponding the first metallic sheath 3.So arrange, effectively improve the mechanical performance of connecting hose, meet the design requirements and the actual needs.Other is identical with embodiment one or two.
Embodiment six: in conjunction with Fig. 1, present embodiment is described, the material of the metallic sheath 7 of present embodiment is aluminium or lead.So arrange, effectively improve the mechanical performance of connecting hose, meet the design requirements and the actual needs.Other is identical with embodiment one or two.
High-tension cable connecting hose manufacturing process
(1), the end of two cables that wish is connected exploits into " pencil stub " shape structure, makes as far as possible each layer of smooth surface, the about 1m-1.5m of length.
(2), by layering solder technology, two cable cores are connected and repaired, make as far as possible its surperficial rounding.
(3), the utilization semi-conductive shielding material identical with cable body recover inner semiconductor layer 13 crosslinked, cooling by mould pressing method, makes as far as possible its smooth surface, smooth.Molding temperature is 120 DEG C, and crosslinking temperature is 180-200 DEG C, and crosslinking time is 30min, and cooling and demolding temperature is below 50 DEG C.
(4), utilize the non-linear insulating material of crosslinkable (non linear coefficient is not less than 0.5) by mould pressing method non-linear shielding layer 12 in inner semiconductor layer 13 outsides make, its two ends are connected with the first crosslinked polyetylene insulated layer 6 of two cables respectively, crosslinked, the cooling and demoulding, makes its surface and smooth, smooth with the first crosslinked polyetylene insulated layer 6 junction as far as possible.Molding temperature is 120 DEG C, and crosslinking temperature is 180-200 DEG C, and crosslinking time is 30min, and calcining temperature is below 50 DEG C.
(5), particular manufacturing craft is enclosed within to cable core junction, utilize the insulating material identical with cable body to make crosslinked polyetylene insulated layer 11 crosslinked by injection moulding process, then slowly cool to 50 DEG C with bottom knockout, make as far as possible its smooth surface, smooth.The large 2-10mm of Thickness Ratio the first insulation thickness of crosslinked polyetylene insulated layer 11, its two ends are connected with ramped shaped with the first crosslinked polyetylene insulated layer 6.Injection temperature is 120 DEG C, and crosslinking temperature is 180-200 DEG C, and crosslinking time is 2-6h, and be 1-3h cooling time.
(6), utilize the non-linear insulating material of crosslinkable by mould pressing method non-linear shielding layer 10 outside crosslinked polyetylene insulated layer 11 outside make, its two ends are connected with the first semi-conductive shield outside 1 of two cables respectively, crosslinked, the cooling and demoulding, makes its surface and smooth, smooth with the first out semiconductor layer 1 junction as far as possible.Molding temperature is 120 DEG C, and crosslinking temperature is 180-200 DEG C, and crosslinking time is 30min, and calcining temperature is below 50 DEG C.
(7), the utilization semi-conductive shielding material identical with cable body made out semiconductor layer 9 in non-linear shielding layer 10 outsides outside by mould pressing method, the junction of the coated outer non-linear shielding layer 10 in its two ends and the first out semiconductor layer 1, crosslinked, the cooling and demoulding, makes its smooth surface, smooth as far as possible.Molding temperature is 120 DEG C, and crosslinking temperature is 180-200 DEG C, and crosslinking time is 30min, and calcining temperature is below 50 DEG C.
(8), the utilization semiconductive material identical with cable body be at the wrapped semiconductive water blocking layer 2 in the outside of the first out semiconductor layer 1 and out semiconductor layer 9, recovers semiconductive water blocking layer.
(9), semiconductive water blocking layer 2 outsides add metallic sheaths 7, weld mutually by argon arc welding and the first metallic sheath 3 at its two ends.
Claims (6)
1. the high-tension cable connecting hose with non-linear shielding layer, described connecting hose comprises inner semiconductor layer (13), crosslinked polyetylene insulated layer (11), out semiconductor layer (9), semiconductive water blocking layer (8), metallic sheath (7) and two cables (I), every cable (I) is by core (4), the first inner semiconductor layer (5), the first crosslinked polyetylene insulated layer (6), the first out semiconductor layer (1), the first semiconductive water blocking layer (2) and the first metallic sheath (3) form, the end of two cables (I) is pencil capitiform structure, the core (4) of exploitation place of two cables (I) links into an integrated entity, the outside of the core (4) linking into an integrated entity is coated with inner semiconductor layer (13) successively by order from inside to outside, crosslinked polyetylene insulated layer (11), out semiconductor layer (9), semiconductive water blocking layer (8) and metallic sheath (7), the two ends of inner semiconductor layer (13) are respectively connected with corresponding the first inner semiconductor layer (5), the two ends of crosslinked polyetylene insulated layer (11) are respectively connected with corresponding the first crosslinked polyetylene insulated layer (6), it is characterized in that: described connecting hose also comprises interior non-linear shielding layer (12) and outer non-linear shielding layer (10), described interior non-linear shielding layer (12) is coated between inner semiconductor layer (13) and crosslinked polyetylene insulated layer (11), and the two ends of interior non-linear shielding layer (12) are respectively connected with corresponding the first crosslinked polyetylene insulated layer (6), described outer non-linear shielding layer (10) is coated between crosslinked polyetylene insulated layer (11) and out semiconductor layer (9), and the two ends of outer non-linear shielding layer (10) are respectively connected with corresponding the first out semiconductor layer (1), the two ends of out semiconductor layer (9) are coated respectively the junction of outer non-linear shielding layer (10) and the first out semiconductor layer (1), semiconductive water blocking layer (8) is coated on the outside of out semiconductor layer (9) and the outside of the first out semiconductor layer (1), and the two ends of semiconductive water blocking layer (8) are respectively connected with corresponding the first semiconductive water blocking layer (2), the outside of semiconductive water blocking layer (8) is coated with metallic sheath (7), the two ends of metallic sheath (7) are respectively connected with corresponding the first metallic sheath (3).
2. a kind of high-tension cable connecting hose with non-linear shielding layer according to claim 1, it is characterized in that: the two ends of outer non-linear shielding layer (10) are respectively equipped with the first slope linkage section (10-1), the end of each the first slope linkage section (10-1) is connected with corresponding the first out semiconductor layer (1).
3. a kind of high-tension cable connecting hose with non-linear shielding layer according to claim 1 and 2, it is characterized in that: the two ends of out semiconductor layer (9) are respectively equipped with the second slope linkage section (9-1), the end of each the second slope linkage section (9-1) is coated respectively the junction of corresponding outer non-linear shielding layer (10) and the first out semiconductor layer (1).
4. a kind of high-tension cable connecting hose with non-linear shielding layer according to claim 1 and 2, it is characterized in that: the two ends of semiconductive water blocking layer (8) are respectively equipped with the 3rd slope linkage section (8-1), the end of each the 3rd slope linkage section (8-1) is connected with corresponding the first semiconductive water blocking layer (2).
5. a kind of high-tension cable connecting hose with non-linear shielding layer according to claim 1 and 2, it is characterized in that: the two ends of metallic sheath (7) are respectively equipped with the 4th slope linkage section (7-1), the end of each the 4th slope linkage section (7-1) is connected with corresponding the first metallic sheath (3).
6. a kind of high-tension cable connecting hose with non-linear shielding layer according to claim 1 and 2, is characterized in that: the material of metallic sheath (7) is aluminium or lead.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210076093.7A CN102611067B (en) | 2012-03-21 | 2012-03-21 | High-voltage cable flexible joint with non-linear shielding layers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210076093.7A CN102611067B (en) | 2012-03-21 | 2012-03-21 | High-voltage cable flexible joint with non-linear shielding layers |
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| CN102611067A CN102611067A (en) | 2012-07-25 |
| CN102611067B true CN102611067B (en) | 2014-08-20 |
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| CN102904140B (en) * | 2012-09-28 | 2015-05-06 | 北京星航机电装备有限公司 | Cable shielding layer splicing method |
| CA2991339C (en) * | 2015-07-06 | 2022-03-01 | Nkt Hv Cables Gmbh | A method of building an insulation system around a naked conductor section of a power cable |
| CN107359425A (en) * | 2017-07-21 | 2017-11-17 | 国网辽宁省电力有限公司丹东供电公司 | Reducing cable core joint |
| CN107807258B (en) * | 2017-09-26 | 2023-04-28 | 杭州西湖电子研究所 | Cable connector with double shielding function |
| CN109347053A (en) * | 2018-11-27 | 2019-02-15 | 北京世普巨龙通信科技有限公司 | The construction of cable restores formula on-line monitoring transition joint and its construction technology |
| CN109935981A (en) * | 2019-03-29 | 2019-06-25 | 广东科启电力技术有限公司 | A kind of 35kV--220kV pouring type cable ontology fusion splice and preparation method thereof |
| CN110957589A (en) * | 2019-11-21 | 2020-04-03 | 深圳供电局有限公司 | Graphite grounding cable connecting device and graphite grounding cable connecting method |
| CN112038790B (en) * | 2020-08-05 | 2021-08-06 | 瑞邦电力科技有限公司 | Prefabricated fusion-spliced cable insulation joint and manufacturing method thereof |
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