CN222051409U - Large-section ultrahigh-voltage direct-current water-blocking cable - Google Patents
Large-section ultrahigh-voltage direct-current water-blocking cable Download PDFInfo
- Publication number
- CN222051409U CN222051409U CN202420739546.8U CN202420739546U CN222051409U CN 222051409 U CN222051409 U CN 222051409U CN 202420739546 U CN202420739546 U CN 202420739546U CN 222051409 U CN222051409 U CN 222051409U
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- CN
- China
- Prior art keywords
- water
- blocking
- conductor
- insulation
- section
- Prior art date
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Links
- 239000004020 conductor Substances 0.000 claims abstract description 43
- 238000009413 insulation Methods 0.000 claims abstract description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000004831 Hot glue Substances 0.000 claims abstract description 5
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 5
- 239000010439 graphite Substances 0.000 claims abstract description 5
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 5
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 5
- 230000001681 protective effect Effects 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 25
- 239000012535 impurity Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 4
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 238000011049 filling Methods 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 description 9
- 238000002679 ablation Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000002500 effect on skin Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 240000005572 Syzygium cordatum Species 0.000 description 2
- 235000006650 Syzygium cordatum Nutrition 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000002224 dissection Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Insulated Conductors (AREA)
Abstract
The utility model discloses a large-section ultrahigh-voltage direct-current water-blocking cable, which comprises a water-blocking conductor, a water-blocking binding belt, a conductor shield, insulation, an insulation shield, a buffer water-blocking belt, a metal water-blocking layer, hot melt adhesive, a high-density polyethylene protective sleeve and an external graphite coating which are sequentially arranged from inside to outside; the conductor comprises a single copper wire with a circular cross section arranged in the center and at least two layers of trapezoidal copper wires stranded on the outer layer of the single copper wire; the metal water-resistant layer is an extrusion smooth aluminum sleeve. According to the utility model, the circular copper single wires and the trapezoid copper single wires are layered and stranded, so that gaps among the single wires can be effectively reduced, the section filling rate of a cable is improved, the current carrying capacity of the cable is increased, and the metal sheath adopts the extrusion smooth aluminum sheath.
Description
Technical Field
The utility model relates to a large-section ultrahigh-voltage direct-current water-blocking cable, and belongs to the technical field of cable preparation.
Background
Engineering such as power grid transformation, large-scale hydropower project and pumped storage often need to operate in high-moisture environments such as underground, underwater, and the like, and the problems such as cable damage and aging often occur under long-term operation, and finally the cable is broken down and equipment is damaged. Because these projects are often very large in scale, the construction cost is high and the maintenance is very difficult. In order to reduce maintenance workload and improve project operation stability, it is necessary to prepare cable products with better water blocking performance. In order to avoid the skin effect of the cable with the cross section, the current ultra-high voltage cable is generally a cable with a large cross section of a segmented conductor, the surface of the cable is often uneven, and the cable cannot be longitudinally blocked by adopting a longitudinally-wrapped water blocking tape and a water blocking yarn like a round conductor after being stranded, so that a metal sheath is often arranged outside the conductor for longitudinal protection. The existing high-current cable metal sheath is generally made of corrugated aluminum sleeves, which are generally made by a method of welding aluminum gaps, and the fault case dissection of the high-voltage cable body in recent ten years discovers that a large number of insulation shielding surface burns or discharge traces and buffer layer ablations occur, even a breakdown phenomenon is caused, and the transmission safety is seriously affected.
Disclosure of utility model
The utility model aims to provide a large-section ultrahigh-voltage direct-current water-blocking cable which solves the technical problems in the background technology.
The technical scheme for realizing the aim of the utility model is as follows: a large-section ultra-high voltage direct current water-blocking cable comprises a water-blocking conductor, a water-blocking binding belt, a conductor shield, insulation, an insulation shield, a buffer water-blocking belt, a metal water-blocking layer, hot melt adhesive, a high-density polyethylene protective sleeve and an external coating which are sequentially arranged from inside to outside; the water-blocking conductor comprises a single copper wire with a circular section arranged in the center and at least two layers of trapezoidal copper wires stranded on the outer layer of the single copper wire; the metal water-resistant layer is an extrusion smooth aluminum sleeve.
According to the utility model, the circular single copper wire and the ladder-shaped copper single wire are layered and stranded, so that gaps among the single wires can be effectively reduced, the section filling rate of a cable is improved, the current carrying capacity of the cable is increased, and compared with the welding of the corrugated aluminum sleeve, the cable breakdown phenomenon caused by ablation of an outer screen and a buffer layer is avoided, and the safety is greatly improved.
Further or alternatively, the water-blocking glue is filled between the conductor single wires of the water-blocking conductor, so that separation between the conductor single wires can be effectively realized, current only flows in the conductor single wires, the skin-effect resistance of the cable is improved, and meanwhile, the water-blocking glue is arranged
The water blocking capacity of the cable core is effectively improved.
Further or alternatively, the water-blocking binding belt is a two-sided semiconductor water-blocking belt, and the water-blocking surface of the water-blocking binding belt is arranged towards the water-blocking conductor so as to further improve the water-blocking capacity of the cable.
Further or alternatively, the conductor shielding, insulating and insulating shielding layers are arranged in a layered manner, and are produced by adopting a co-extrusion process, so that the production process flow is saved, the possibility of generating an interlayer gap is reduced, and the water tree phenomenon is prevented.
Further or alternatively, the conductor shield is an ultra-smooth shielding material, and the insulation is made of an ultra-clean crosslinked polyethylene insulating material with the impurity smaller than 50 mu m, so that gaps caused by the impurity are reduced, and the water blocking effect is improved.
Further or alternatively, the outer coating is a semiconductive graphite coating for testing the pressure resistance of the jacket. By adopting the technical scheme, the utility model has the following beneficial effects:
(1) According to the utility model, the circular single copper wire and the ladder-shaped copper single wire are layered and stranded, so that gaps among the single wires can be effectively reduced, the section filling rate of a cable is improved, the current carrying capacity of the cable is increased, the metal sheath of the cable is an extruded smooth aluminum sleeve, compared with a welding corrugated aluminum sleeve, the cable breakdown phenomenon caused by ablation of an outer screen and a buffer layer is avoided, and the safety is greatly improved.
(2) According to the utility model, the water blocking glue is filled between the conductor single lines of the water blocking conductor, so that separation between the conductor single lines can be effectively realized, current only flows in the conductor single lines, the skin effect resistance of the cable is improved, and the water blocking capacity of the cable core of the cable is effectively improved.
(3) The water-blocking binding belt is a two-sided semiconductor water-blocking belt, and the water-blocking surface of the water-blocking binding belt faces to the water-blocking conductor so as to further improve the water-blocking capacity of the cable.
(4) The conductor shielding, insulating and insulating shielding layers are arranged in layers and produced by adopting a coextrusion process, so that the production process flow can be saved, the possibility of generating interlayer gaps can be reduced, and the water tree phenomenon can be prevented.
(5) The conductor shielding layer is an ultra-smooth shielding material, and the insulation is made of an ultra-clean crosslinked polyethylene insulating material with the impurity smaller than 50 mu m, so that gaps caused by the impurity are reduced, and the water blocking effect is improved.
(6) The external coating is a semiconductive graphite coating layer and is used for sheath pressure resistance test.
Drawings
In order that the contents of the present utility model may be more clearly understood, reference will now be made to the following description of specific embodiments thereof taken in conjunction with the accompanying drawings,
The utility model will be described in further detail, wherein
Fig. 1 is a schematic structural view of the present utility model.
The reference numerals in the drawings are: the waterproof conductor 1, the waterproof binding belt 2, the conductor shield 3, the insulation 4, the insulation shield 5, the buffer water-blocking belt 6, the metal waterproof layer 7, the hot melt adhesive 8, the high-density polyethylene protective sleeve 9 and the external coating 10.
Detailed Description
For a better understanding of the above technical scheme, the following description will be taken in conjunction with the accompanying drawings and specific embodiments
The technical scheme is described in detail.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Accordingly, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the inventive product is used, or those conventionally understood by those skilled in the art, merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.
Example 1
Referring to fig. 1, the large-section ultrahigh-voltage direct-current water-blocking cable of the embodiment is characterized in that: the waterproof conductor 1 comprises a single copper wire with a circular section arranged in the center and at least two layers of ladder-shaped copper wires stranded on the outer layer of the single copper wire, wherein the waterproof conductor 1, the waterproof binding belt 2, the conductor shield 3, the insulation 4, the insulation shield 5, the buffer water-blocking belt 6, the metal water-blocking layer 7, the hot melt adhesive 8, the high-density polyethylene protective sleeve 9 and the external coating 10 are sequentially arranged from inside to outside; the metal water-resistant layer 7 is an extrusion smooth aluminum sleeve.
And water-blocking glue is filled between the conductor single wires of the water-blocking conductor 1.
The conductor with the large section in the figure is 2500m2 in large section, the conductor structure is formed by stranding 115 single wires of 8 layers of 1+6+8+12+16+20+24+28, and each layer is filled with the semiconductor resistor water gel.
The water-blocking binding belt 2 is a two-sided semiconductor water-blocking belt, and the water-blocking surface of the water-blocking binding belt is arranged towards the water-blocking conductor 1.
The conductor shield 3, the insulation 4 and the insulation shield 5 are arranged in layers and are produced by adopting a coextrusion process. The three layers are co-extruded through a VCV vertical cross-linking production line, and material selection is needed to be paid attention to in the co-extrusion process, wherein the conductor shield 3 is an ultra-smooth shielding material, and the insulation 4 is an ultra-clean cross-linked polyethylene insulation material with impurities smaller than 50 mu m.
The outer coating 10 is a semiconductive graphite coating.
While the foregoing is directed to embodiments of the present utility model, other and further details of the utility model may be had by the present utility model, it should be understood that the foregoing description is merely illustrative of the present utility model and that no changes, substitutions, or alterations herein may be made without departing from the spirit and principles of the utility model.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420739546.8U CN222051409U (en) | 2024-04-11 | 2024-04-11 | Large-section ultrahigh-voltage direct-current water-blocking cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420739546.8U CN222051409U (en) | 2024-04-11 | 2024-04-11 | Large-section ultrahigh-voltage direct-current water-blocking cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222051409U true CN222051409U (en) | 2024-11-22 |
Family
ID=93509790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420739546.8U Active CN222051409U (en) | 2024-04-11 | 2024-04-11 | Large-section ultrahigh-voltage direct-current water-blocking cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222051409U (en) |
-
2024
- 2024-04-11 CN CN202420739546.8U patent/CN222051409U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |