CN214336354U - Water-blocking aluminum split conductor - Google Patents
Water-blocking aluminum split conductor Download PDFInfo
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- CN214336354U CN214336354U CN202022603799.7U CN202022603799U CN214336354U CN 214336354 U CN214336354 U CN 214336354U CN 202022603799 U CN202022603799 U CN 202022603799U CN 214336354 U CN214336354 U CN 214336354U
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Abstract
A water-blocking type aluminum segmented conductor is formed by sequentially wrapping a semi-conductive water-blocking tape layer and a semi-conductive nylon tape layer after twisting n same fan-shaped strand blocks (2), a central water-blocking yarn (4) and n edge water-blocking yarns (3); an insulating water-blocking tape (5) is arranged between every two adjacent fan-shaped strand blocks; on the radial section of the water-blocking type aluminum segmented conductor, the section of the fan-shaped strand block (2) is fan-shaped, the central water-blocking yarn is at the position of the center of a fan, and the edge water-blocking yarns are at the positions of the arc angles of the fan; the fan-shaped strand block is formed by stranding a plurality of aluminum monofilaments (1) and then performing die pressing. The conductor structure is low in forming difficulty, overcomes the defects of low elongation, looseness and difficulty in shaping of aluminum single lines, and adds a stable water blocking material between every two adjacent strand blocks, so that the requirement of conductor water blocking is met.
Description
Technical Field
The technical scheme particularly relates to a water-blocking type aluminum-core split conductor, belongs to the technical field of manufacturing of ultrahigh-voltage power cable conductors, and is suitable for large-section aluminum-core power cable conductors in the field of ultrahigh-voltage power cables. The nominal section of the conductor is 800mm2~2500mm2The method is used for reducing the loss of the large-section high-voltage cable line and improving the transmission capacity of the cable line.
Background
The ultrahigh-voltage large-section power cable is the highest-end product in the ultrahigh-voltage power cables in China and even in the world at present, represents the highest level of the cable industry in the world at present, has the advantages of large capacity, low loss, high reliability and the like, can greatly improve the transmission capacity of a power transmission and distribution line, reduces the loss, and is increasingly applied in China. In order to reduce the loss of a large-section high-voltage cable line and to increase the transmission capacity of the cable line, it is necessary to reduce the ac resistance of the conductor. The alternating current resistance of the conductor increases along with the increase of the skin effect and the proximity effect, and the skin effect and the proximity effect are more obvious when the sectional area of the conductor is larger. Therefore, the national standard for power cables specifies a nominal section of 800mm2The above conductors must adopt a split conductor structure.
The conductor of the product mainly comprises a copper core and an aluminum core, and the plastic deformation capability of copper metal is much better than that of aluminum, so that the copper split conductor is widely popularized and applied. However, the aluminum split conductor is difficult to produce due to the large processing difficulty, and the technical indexes are more difficult to achieve due to the addition of the water-blocking series materials. At present, the water-blocking type aluminum split conductor used on the ultra-high voltage cable still belongs to the technical blank.
Disclosure of Invention
The invention provides a water-blocking type aluminum segmented conductor which is formed by sequentially wrapping a semi-conductive water-blocking belt layer and a semi-conductive nylon belt layer after twisting n same fan-shaped strand blocks 2, a central water-blocking yarn 4 and n edge water-blocking yarns 3; an insulating water-blocking tape 5 is arranged between every two adjacent fan-shaped strand blocks; on the radial section of the water-blocking type aluminum segmented conductor, the section of the fan-shaped strand block 2 is fan-shaped, the central water-blocking yarn is at the position of the center of a fan, and the edge water-blocking yarns are at the positions of the arc angles of the fan; the fan-shaped strand block is formed by stranding a plurality of aluminum monofilaments 1 and then performing die pressing.
Preferably:
n=5；
the central angle of the fan-shaped strand block corresponding to the fan shape is 72oThe height of the fan is 24.3 plus or minus 0.2mm, and the width of the fan is 27.0 plus or minus 0.2 mm; the pre-twisting pitch of the fan-shaped strand block is not more than 1581 mm; the outer diameter of the five fan-shaped strand blocks after being twisted is phi 50.0 +/-0.3 mm;
the insulating and water-blocking tape has a nominal thickness of 0.35mm and a width of 50.0 mm. The width of the insulating water-blocking tape is slightly smaller than the sum of the widths of the two side edges of the dividing blocks, and the five-divided conductor is filled with three insulating water-blocking tapes, so that at least one layer of insulating water-blocking tape is kept between any two adjacent strand blocks.
The diameter of the central water-blocking yarn is phi 6 mm;
the diameter of the edge water-blocking yarn is phi 3 mm;
the semiconductive water-blocking tape layer is formed by wrapping a layer of semiconductive water-blocking tape in a right-hand overlapping mode, the nominal thickness of the semiconductive water-blocking tape is 0.50mm, and the width of the semiconductive water-blocking tape is 50 mm; the lapping overlapping rate is 48% -52%;
the semiconductive nylon belt layer is formed by lapping a layer of semiconductive nylon belt in a left-hand overlapping mode, the nominal thickness of the semiconductive nylon belt is 0.14mm, and the width of the semiconductive nylon belt is 50 mm; the lapping overlapping rate is 48% -52%;
the whole outer diameter of the wrapped water-blocking type aluminum split conductor is phi 51.5 +/-0.3 mm.
The aluminum monofilament 1 is a hardened aluminum monofilament with phi of 2.74 +/-0.01 mm formed by drawing a round aluminum rod with phi of 9.5 mm; the elongation of the aluminum monofilament is 5 percent, and the volume resistivity of the aluminum monofilament at 20 ℃ is not more than0.02864Ω.mm2/m。
The fan-shaped strand block is formed by layering and stranding 61 aluminum monofilaments; the 1st to 5 th layers of aluminum monofilaments from the inside to the outside are regularly arranged according to 1, 6, 12, 18 and 24; the monofilament twisting direction of the 2 nd to 5 th layers is S, Z, S and S directions in sequence, and the pre-twisting direction is leftward.
The stranding pitch is respectively 259mm, 257mm, 201mm and 140mm from the 5 th layer to the 1st layer, and the tolerance range of the stranding pitch is +/-10 mm;
the fan-shaped height is respectively 24.3mm, 18.4mm, 13.0mm and 8.4mm from the 5 th layer to the 1st layer, and the tolerance range is +/-0.02 mm;
the widths of the fan-shaped parts from the 5 th layer to the 1st layer are respectively 27.0mm, 20.8mm, 15.0mm and 9.0mm, and the tolerance range is +/-0.02 mm.
During manufacturing, the use and distribution of the pressing wheel are as follows: after the layers 1 and 2 are twisted, a group of positive pressure wheels are adopted to press a primary cambered surface and a primary side surface;
after the 3 rd layer is twisted, a group of positive pressure wheels and a group of side pressure wheels are adopted for pressing, the positive pressure wheels press the cambered surface and the side surface, and the side pressure wheels press the camber angle;
after the 4 th layer and the 5 th layer are twisted, three groups of pressing wheels are adopted respectively, the first group of positive pressure wheels press the cambered surface and the side surface, the second group of side pressing wheels press two cambered angles, and the third group of positive pressure wheels press the cambered surface and the side surface.
In the prior art, the water-blocking yarn is composed of industrial polyester filament, high-molecular expansion water-absorbing resin and an adhesive.
Compared with the prior art, the invention has the following beneficial effects:
the structure is convenient for process realization, and the existing equipment can be utilized to conveniently realize that each layer of aluminum single wire is changed into multi-time compression molding from one-time compression molding, so that the one-time deformation rate of the aluminum single wire is reduced, and the molding difficulty is greatly reduced. The defects of low elongation, looseness and difficult shaping of the aluminum monofilament are overcome, the structure of the fan-shaped strand block completely meets the theoretical design requirement, the uniform appearance and the consistent pre-twisting pitch of the aluminum core fan-shaped strand block are ensured, and the outer diameter of the conductor is round and uniform after cabling. In the stable fan-shaped strand block twisting structure, a stable water-blocking material is added between adjacent strand blocks, so that the requirement of longitudinal water blocking of the conductor is met.
Drawings
FIG. 1 is a schematic radial cross-sectional view of the cable of the present embodiment;
FIG. 2 is a schematic interface diagram of a fan-shaped strand block;
in the figure: 1. the cable comprises aluminum single wires, 2 fan-shaped strand blocks, 3 edge water-blocking yarns, 4 center water-blocking yarns, 5 insulating water-blocking tapes, 6 semiconductive water-blocking tape layers, 7 semiconductive nylon tape layers; 8. camber angle, 9, camber, 10, edge, 11, central angle, 12, layer 2 aluminum monofilament, 13, layer 3 aluminum monofilament, 14, layer 4 aluminum monofilament, 15, layer 5 aluminum monofilament.
Detailed Description
The technical solution is further described below with reference to specific examples as follows:
referring to fig. 1, a water-blocking aluminum segmented conductor is composed of n identical fan-shaped strand blocks 2, a central water-blocking yarn 4, and n edge water-blocking yarns 3, which are twisted and then sequentially wrapped with a semi-conductive water-blocking tape layer and a semi-conductive nylon tape layer; an insulating water-blocking tape 5 is arranged between every two adjacent fan-shaped strand blocks; on the radial section of the water-blocking type aluminum segmented conductor, the section of the fan-shaped strand block 2 is fan-shaped, the central water-blocking yarn is at the position of the center of a fan, and the edge water-blocking yarns are at the positions of the arc angles of the fan; the fan-shaped strand block is formed by stranding a plurality of aluminum monofilaments 1 and then performing die pressing.
The water-blocking aluminum split conductor can reduce the alternating current resistance of the conductor, further reduce the loss of a large-section high-voltage cable line and improve the transmission capacity of the cable line.
The principle is that the alternating current resistance of a conductor increases with the increase of the skin effect and the proximity effect, the larger the cross-sectional area of the conductor, the more obvious the skin effect and the proximity effect, and the split conductor structure can overcome the defect.
The aluminum split conductor structure is formed by layering and stranding aluminum single wires according to specifications. When the split type aluminum conductor is realized, the split type aluminum conductor can be respectively formed and pre-twisted into five fan-shaped strand blocks under the action of the V-shaped pressing wheel, and the fan-shaped strand blocks are stranded into the aluminum split conductor in a cabling mode.
For single line elongation of aluminumUnder the condition that the molding compaction degree is low and small, the structure can be suitable for a rolling process in production, the fan-shaped strand blocks are layered compacted and are changed into two or three V-shaped press wheels by one press wheel design, the fan-shaped cambered surfaces, the fan-shaped side surfaces, the central angles and the camber angles are rolled from different angles, the fan-shaped central angles are ensured to be uniform and consistent, and the fan-shaped central angles are all 72 degreesoThe method has the advantages that the aluminum single wire layer is changed from one-time compression molding to multiple-time compression molding, the one-time deformation rate of the aluminum single wire is reduced, the production molding difficulty is greatly reduced, the defects of low elongation rate, looseness and difficult molding of the aluminum single wire are overcome, and the fan-shaped strand block structure completely meets the theoretical design requirement. Under the stable structure, a stable water-blocking material is added between every two adjacent strand blocks, so that the requirement of conductor water blocking is met.
With a cross-sectional area of 1600mm2The water-blocking aluminum split conductor is an integral round conductor and is formed by twisting five fan-shaped strand blocks; the fan-shaped strand block consists of 61 round aluminum monofilaments; the central angles of the five fan-shaped strand blocks are all 72oThe central gap is filled with phi 6mm water-blocking yarns, and the arc angles of adjacent strand blocks are filled with five phi 3mm water-blocking yarns; five 72oThe fan-shaped strand blocks are longitudinally wrapped and filled with three insulating water-blocking tapes with the same width, and the peripheries of the fan-shaped strand blocks are wrapped with the semi-conductive water-blocking tapes and the semi-conductive nylon tapes and are tightly tied after the fan-shaped strand blocks are stranded in a cabled mode. When the method is realized:
firstly: drawing a phi 9.5mm aluminum rod into a standard hard round aluminum single wire with the diameter phi 2.74 +/-0.01 mm, wherein the elongation of the aluminum single wire is 5 percent, and the volume resistivity at 20 ℃ is not more than 0.02864 omega2And/m. The surface of the aluminum single line should be smooth and clean without scratches, oil stains and the like.
Then: the method comprises the steps of stranding 61 aluminum single lines in layers, arranging the aluminum single lines according to the 1+6+12+18+24 (layer) regular mode, and compressing the aluminum single lines into central angles 72 by four times in five layers under the action of a V-shaped pressing wheeloThe fan-shaped strand block is pre-twisted and molded.
Use and dispensing of the puck: after the 1+6 twisting, a group of positive pressure wheels are adopted to press a primary cambered surface and a primary side surface. After being twisted by 1+6+12, a group of positive pressure wheels and a group of side pressure wheels are adopted, the positive pressure wheels press a primary cambered surface and a side surface, and the side pressure wheels press a camber angle. After being twisted by 1+6+12+18 and 1+6+12+18+24, three groups of pressing wheels are adopted, the first group of positive pressure wheels press the cambered surface and the side surface, the second group of side pressing wheels press the camber angle, and the third group of positive pressure wheels press the cambered surface and the side surface, so that the final forming is realized. Each layer of pressing adopts pressing wheels with different sizes and different angles for pressing, and synchronously rotates to pre-twist and form the fan-shaped strand block. The directions of the single strands are set from inside to outside according to S, Z, S, S, the direction of the single strand on the second outer layer is the S direction, and the direction of the single strand on the outermost layer is the S direction.
The pre-twisting direction is leftward, and the pre-twisting pitch is not more than 1581 mm. 72oThe fan-shaped strand block has a fan-shaped height of 24.3 +/-0.2 mm and a fan-shaped width of 27.0 +/-0.2 mm.
The stranding pitches are 259mm, 257mm, 201mm and 140mm from outside to inside respectively, and the tolerance range of the stranding pitches is +/-10 mm;
the fan-shaped heights are respectively 24.3mm, 18.4mm, 13.0mm and 8.4mm from outside to inside, and the tolerance range is +/-0.02 mm;
the widths of the sectors are respectively 27.0mm, 20.8mm, 15.0mm and 9.0mm from outside to inside, and the tolerance range is +/-0.02 mm;
the third step: five central angles 72oThe fan-shaped strand blocks are stranded in a cabling mode, a layer of insulating water-blocking tape with the nominal thickness of 0.35mm and the width of 50.0mm is filled between every two adjacent strand blocks in the cabling mode (the width of the insulating water-blocking tape is slightly smaller than the sum of the widths of the two sides of the dividing blocks, three insulating water-blocking tapes are used for filling five dividing conductors, at least one layer of insulating water-blocking tape is used for isolating any adjacent strand blocks, a phi 6mm water-blocking yarn is filled in the cabling center, and a phi 3mm water-blocking yarn is filled at the radian angle of each adjacent fan-shaped strand block. After cabling, a layer of semiconductive water-blocking tape with nominal thickness of 0.50mm and width of 50mm is lapped and wound in a right-hand overlapping mode, a layer of semiconductive nylon tape with nominal thickness of 0.14mm and width of 50mm is lapped and wound in a left-hand overlapping mode, and the lapping overlapping rate is 48% -52%. The cable roundness after lapping reaches more than 99.5%, and the wrapping tape has no phenomena of protrusion, wrinkle, bag leakage and the like. Outer diameter of the conductor: phi 51.5 +/-0.3 mm (including wrapping tape).
The diameter of the water-blocking yarn is phi 3mm, the tensile strength is more than or equal to 60N, the elongation is more than or equal to 10 percent, the water absorption expansion rate is more than or equal to 50ml/g/1st min, the water content is less than 5 percent, and the long-term stability is 150 ℃.
The diameter of the water-blocking yarn is 6mm, the tensile strength is more than or equal to 25N, the elongation is more than or equal to 10 percent, the water absorption expansion rate is more than or equal to 40ml/g/1st min, the water content is less than 5 percent, and the long-term stability is 150 ℃.
The nominal thickness of the insulating water-blocking tape is 0.35mm, the thickness deviation range is 0.03mm, the tensile strength is more than or equal to 50N, the elongation is more than or equal to 12%, the water absorption expansion speed is more than or equal to 9mm/1st min, the expansion height is more than or equal to 18mm/3min, the water content is less than 5%, and the long-term stability is 120 ℃.
The nominal thickness of the semiconductive water-blocking tape is 0.50mm, the thickness deviation range is 0.03mm, the tensile strength is more than or equal to 50N, the elongation is more than or equal to 12%, the water absorption expansion speed is more than or equal to 9mm/1st min, the expansion height is more than or equal to 15mm/3min, the water content is less than 5%, and the long-term stability is 120 ℃.
Result detection, this 1600mm2The technical characteristics of the water-blocking type aluminum split conductor include:
(1) the outer diameter difference of the same section is not more than 0.4 mm;
(2) the height difference of the fan angles of the adjacent fan-shaped blocks is not more than 0.3 mm;
(3) the roundness of the same section is more than or equal to 99.5 percent;
(4) the direct current resistance of the conductor at 20 ℃ is less than or equal to 0.0186 omega/km (1600 mm)2）；
(5) According to the national standard test method, a section of 3m long cable is cut from the cable after bending test and placed horizontally, a section of ring with the width of about 30mm is cut at the middle part of the cable, a water column with the height of 1m is adopted, heating cycles are applied for 10 times, and no moisture seeps out from the two ends of the cable sample.
Claims (4)
1. A water-blocking aluminum split conductor is characterized in that: the semi-conductive nylon band is formed by sequentially wrapping a semi-conductive water-blocking band layer and a semi-conductive nylon band layer after twisting n same fan-shaped strand blocks (2), a central water-blocking yarn (4) and n edge water-blocking yarns (3); an insulating water-blocking tape (5) is arranged between every two adjacent fan-shaped strand blocks;
on the radial section of the water-blocking type aluminum split conductor, the section of the fan-shaped strand block (2) is fan-shaped, the central water-blocking yarn is at the position of a fan-shaped central angle (11), and the edge water-blocking yarns are at the position of a fan-shaped arc angle (8);
the fan-shaped strand block is formed by stranding a plurality of aluminum monofilaments (1) and then performing die pressing.
2. A water-blocking aluminum segmented conductor as set forth in claim 1 wherein n = 5;
the central angle of the fan-shaped strand block corresponding to the fan shape is 72oThe height of the fan is 24.3 plus or minus 0.2mm, and the width of the fan is 27.0 plus or minus 0.2 mm; the pre-twisting direction of the fan-shaped strand block is left, and the pre-twisting pitch is not more than 1581 mm; the outer diameter of the five fan-shaped strand blocks after being twisted is phi 50.0 +/-0.3 mm;
the nominal thickness of the insulating water-blocking tape is 0.35mm, the width is 50.0mm, the thickness deviation range is 0.03mm, the tensile strength is more than or equal to 50N, the elongation is more than or equal to 12%, the water absorption expansion speed is more than or equal to 9mm/1st min, the expansion height is more than or equal to 18mm/3min, the water content is less than 5%, and the long-term stability is 120 ℃;
the diameter of the central water-blocking yarn is phi 6 mm; the tensile strength is more than or equal to 25N, the elongation is more than or equal to 10 percent, the water absorption expansion rate is more than or equal to 40ml/g/1st min, the water content is less than 5 percent, and the long-term stability is 150 ℃;
the diameter of the edge water-blocking yarn is phi 3mm, the tensile strength is more than or equal to 60N, the elongation is more than or equal to 10 percent, the water absorption expansion rate is more than or equal to 50ml/g/1st min, the water content is less than 5 percent, and the long-term stability is 150 ℃;
the semiconductive water-blocking tape layer is formed by wrapping a layer of semiconductive water-blocking tape in a right-hand overlapping mode, the nominal thickness of the semiconductive water-blocking tape is 0.50mm, and the width of the semiconductive water-blocking tape is 50 mm; the lapping overlapping rate is 48-52%, the thickness deviation range is 0.03mm, the tensile strength is more than or equal to 50N, the elongation is more than or equal to 12%, the water absorption expansion speed is more than or equal to 9mm/1st min, the expansion height is more than or equal to 15mm/3min, the water content is less than 5%, and the long-term stability is 120 ℃;
the semiconductive nylon belt layer is formed by lapping a layer of semiconductive nylon belt in a left-hand overlapping mode, the nominal thickness of the semiconductive nylon belt is 0.14mm, and the width of the semiconductive nylon belt is 50 mm; the lapping overlapping rate is 48% -52%;
the whole outer diameter of the wrapped water-blocking type aluminum split conductor is phi 51.5 +/-0.3 mm.
3. A water-blocking type aluminum divided conductor according to claim 1, wherein said aluminum monofilament (1) is composed ofDrawing a phi 9.5mm round aluminum rod to form a phi 2.74 +/-0.01 mm duralumin monofilament; the elongation of the aluminum monofilament is 5 percent, and the volume resistivity of the aluminum monofilament at 20 ℃ is not more than 0.02864 omega mm2/m。
4. The water-blocking aluminum segmented conductor as set forth in claim 1, wherein said fan-shaped strand block is formed by layering and stranding 61 aluminum monofilaments; the 1st to 5 th layers of aluminum monofilaments from the inside to the outside are regularly arranged according to 1, 6, 12, 18 and 24; the monofilament twisting directions of the 2 nd to 5 th layers are S, Z, S and S directions in sequence;
the stranding pitch is respectively 259mm, 257mm, 201mm and 140mm from the 5 th layer to the 1st layer, and the tolerance range of the stranding pitch is +/-10 mm;
the fan-shaped strand block corresponds to a fan shape:
the fan-shaped height is respectively 24.3mm, 18.4mm, 13.0mm and 8.4mm from the 5 th layer to the 1st layer, and the tolerance range is +/-0.02 mm;
the widths of the fan-shaped parts from the 5 th layer to the 1st layer are respectively 27.0mm, 20.8mm, 15.0mm and 9.0mm, and the tolerance range is +/-0.02 mm.
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| CN202022603799.7U CN214336354U (en) | 2020-11-12 | 2020-11-12 | Water-blocking aluminum split conductor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114822996A (en) * | 2022-04-15 | 2022-07-29 | 江苏上上电缆集团有限公司 | Composite special-shaped stranded conductor manufacturing method and conductor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114822996A (en) * | 2022-04-15 | 2022-07-29 | 江苏上上电缆集团有限公司 | Composite special-shaped stranded conductor manufacturing method and conductor |
| CN114822996B (en) * | 2022-04-15 | 2023-08-22 | 江苏上上电缆集团有限公司 | Manufacturing method of composite special-shaped stranded conductor and conductor |
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