CN112582096A - High-conductivity heat-resistant aluminum alloy stranded wire - Google Patents
High-conductivity heat-resistant aluminum alloy stranded wire Download PDFInfo
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- CN112582096A CN112582096A CN202011400055.3A CN202011400055A CN112582096A CN 112582096 A CN112582096 A CN 112582096A CN 202011400055 A CN202011400055 A CN 202011400055A CN 112582096 A CN112582096 A CN 112582096A
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- aluminum alloy
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- resistant aluminum
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/08—Several wires or the like stranded in the form of a rope
- H01B5/10—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material
- H01B5/102—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material stranded around a high tensile strength core
- H01B5/104—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material stranded around a high tensile strength core composed of metallic wires, e.g. steel wires
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Abstract
The invention discloses a high-conductivity heat-resistant aluminum alloy stranded wire which comprises an internal reinforcing core and a heat-resistant aluminum alloy conducting layer stranded outside the internal reinforcing core; the inner reinforcing core comprises a central reinforcing core wire, and one or two outer reinforcing core wires are concentrically stranded outside the central reinforcing core wire; the heat-resistant aluminum alloy conducting layer is formed by concentrically and tightly twisting one or more layers of heat-resistant aluminum alloy wires on the outer side of the inner reinforcing core; the linear expansion coefficient of the reinforced core wire is less than or equal to 3 x 10‑6The coefficient of linear expansion of the heat-resistant aluminum alloy wire is more than or equal to 23 x 10 DEG C‑6V. C. The high-conductivity heat-resistant aluminum alloy stranded wire has the characteristics of low sag and energy conservation.
Description
Technical Field
The invention relates to the technical field of overhead line power transmission, in particular to a high-conductivity heat-resistant aluminum alloy stranded wire.
Background
With the continuous and high-speed development of national economy, the demand of people for further improving the transmission capacity of the active power grid is more obvious. At present, 60% IACS heat-resistant aluminum alloy stranded wires are often selected for line engineering in narrow areas of transformer substation buses or line corridors, the long-term use temperature of the wires reaches 150 ℃, the purposes of realizing high-temperature safe operation of the lines and increasing the transmission capacity of the lines are achieved, but because the conductive units of the wires are made of 60% IACS heat-resistant aluminum alloy materials, the energy loss is high when the overhead transmission lines operate at high temperature; and the high-temperature sag of the lead is large, the capacity is increased, meanwhile, the strength or height of the existing tower needs to be optimized, the construction period is long, and the construction cost is high.
Disclosure of Invention
The invention aims to provide a high-conductivity heat-resistant aluminum alloy stranded wire which has the characteristics of low sag and energy conservation.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a high-conductivity heat-resistant aluminum alloy stranded wire which comprises an internal reinforced core and a heat-resistant aluminum alloy conducting layer stranded outside the internal reinforced core;
the inner reinforcing core comprises a central reinforcing core wire, and one or two outer reinforcing core wires are concentrically stranded outside the central reinforcing core wire;
the heat-resistant aluminum alloy conducting layer is formed by concentrically and tightly twisting one or more layers of heat-resistant aluminum alloy wires on the outer side of the inner reinforcing core;
linear expansion of the reinforcing coreCoefficient is not more than 3 x 10-6The coefficient of linear expansion of the heat-resistant aluminum alloy wire is more than or equal to 23 x 10 DEG C-6/℃。
Further, the central reinforcing core wire and the outer layer reinforcing core wire are both aluminum-coated invar steel wires with the electric conductivity of 10% IACS or 14% IACS.
Further, the heat-resistant aluminum alloy wire is a high-conductivity heat-resistant aluminum alloy wire having an electric conductivity of 61.8% IACS.
Further, when the inner reinforcing core is formed by twisting 7 reinforcing core wires, the twisting layer pitch ratio of the 6 outer reinforcing core wires is 16-26, and the twisting direction of the twisting layers in the adjacent aluminum alloy conducting layers is opposite.
Further, when the inner reinforcing core is formed by twisting 19 reinforcing core wires, the twisting layer pitch ratio of 6 reinforcing core wires in the inner layer is 16-26, the twisting layer pitch ratio of 12 reinforcing core wires in the outer layer is 14-22, and the twisting direction of the twisting layers in the adjacent aluminum alloy conducting layers is opposite.
Further, when the number of the aluminum alloy conducting layers is more than or equal to 2, the twisting direction of the outermost heat-resistant aluminum alloy conducting layer is the right direction, the twisting directions of any two adjacent heat-resistant aluminum alloy conducting layers are opposite, and the pitch diameter ratio of the outer heat-resistant aluminum alloy conducting layer is not more than that of the adjacent inner heat-resistant aluminum alloy conducting layer.
Furthermore, the hinge layer pitch diameter ratio of the heat-resistant aluminum alloy conducting layer on the outermost layer is 10-12, and the hinge layer pitch diameter ratio of the heat-resistant aluminum alloy conducting layer on the innermost layer is 10-16.
Further, the section of the heat-resistant aluminum alloy wire is in a trapezoid shape or an SZ shape.
The invention has the beneficial effects that:
1. the internal reinforcing core of the high-conductivity heat-resistant aluminum alloy wire has extremely low linear expansion coefficient (less than or equal to 3X 10)-6/° c) and a coefficient of linear expansion (23 x 10) with the heat-resistant aluminum alloy wire of the outer layer-6v./deg.C), and under the same temperature rise condition, the thermal expansion extension difference is larger, after reaching a certain temperature, the stress transfer is realized, the operation tension is completely transferred to the internal reinforced core, and at the moment, the high-temperature sag of the wire is formed byThe central reinforced core with low linear expansion coefficient determines, thereby realizing that the sag of the wire in high-temperature operation is not increased basically.
2. According to the high-conductivity heat-resistant aluminum alloy wire, the section of the heat-resistant aluminum alloy wire is in a trapezoid shape or an SZ shape, the aluminum filling coefficient of the wire is improved to over 90% from 75% under the condition that the section of the transmission aluminum is unchanged, the diameter of the wire can be reduced by about 10%, the wind acting force of the wire can be effectively reduced, and the wire has the wind pressure reducing function; meanwhile, as the 'ladder' or 'SZ' molded lines have smooth surfaces and compact structures, and supercooled water drops and ice and snow are not easy to gather on the surfaces of the wires, the galloping probability of the wires in ice and snow days is reduced, and the snow-covered ice-covered wire has better snow-covered and ice-covered characteristics.
3. According to the high-conductivity heat-resistant aluminum alloy conductor, the internal reinforcing core is made of the aluminum-coated invar steel wire with the conductivity of 10% IACS or 14% IACS, and the conductivity is higher than that of a galvanized steel wire with the same specification, so that the internal reinforcing core has a power transmission function, and the alternating current and direct current resistance of the conductor is effectively reduced; and because no potential difference exists between the inner reinforcing core and the adjacent heat-resistant aluminum alloy conducting layer, the inner reinforcing core has the characteristic of excellent electrochemical corrosion resistance and can be used for a long time.
4. According to the high-conductivity heat-resistant aluminum alloy conductor, the heat-resistant aluminum alloy wire is a high-conductivity heat-resistant aluminum alloy conductor with the conductivity of 61.8% IACS, the maximum temperature of the conductor can reach 150 ℃ after long-term use, the temperature is improved by 80 ℃ compared with that of the common aluminum material, the current transmission capacity of the conductor is greatly improved, and the energy loss of a power transmission line is reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of one embodiment of a high conductivity heat resistant aluminum alloy stranded wire of the present invention;
FIG. 2 is a schematic cross-sectional view of another embodiment of the high-conductivity heat-resistant aluminum alloy stranded wire of the present invention;
FIG. 3 is a route of a 60% IACS heat-resistant aluminum alloy wire;
FIG. 4 is a route of 61.8% IACS heat-resistant aluminum alloy wire;
wherein: 1. an aluminum-clad invar wire; 2. 61.8% IACS heat-resistant aluminum alloy wire.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As described in the background art, at present, the high-temperature sag of an overhead transmission line is large, and the strength or height of an existing tower needs to be optimized while capacity is increased, so that the construction period is long, and the construction cost is high.
In order to solve the technical problem, the invention provides a high-conductivity heat-resistant aluminum alloy stranded wire which comprises an internal reinforcing core and a heat-resistant aluminum alloy conducting layer stranded outside the internal reinforcing core; the inner reinforcing core comprises a central reinforcing core wire, and one or two outer reinforcing core wires are concentrically stranded outside the central reinforcing core wire. The heat-resistant aluminum alloy conducting layer is formed by concentrically and tightly twisting one or more layers of heat-resistant aluminum alloy wires on the outer side of the inner reinforcing core. And the linear expansion coefficient of the reinforced core wire is less than or equal to 3 x 10-6V. DEG C, the coefficient of linear expansion of the heat-resistant aluminum alloy wire is more than or equal to 23 x 10-6/℃。
In the invention, the inner reinforcing core is selected to have extremely low linear expansion coefficient (less than or equal to 3X 10)-6/° c) core wire having a linear expansion coefficient (23 x 10 or more) with the heat-resistant aluminum alloy wire of the outer layer-6/° c), so under the same temperature rise condition, the thermal expansion extension difference is larger, after reaching a certain temperature, the stress transfer is realized, the operation tension is completely transferred to the internal reinforced core, at the moment, the high-temperature sag of the wire is determined by the central reinforced core with low linear expansion coefficient, and the high-temperature operation sag base of the wire is realizedThe cost is not increased.
In the invention, when the inner reinforced core is formed by twisting 7 reinforced core wires (namely the outer layer reinforced core wire is 1 layer), the twisting layer pitch ratio of the 6 reinforced core wires on the outer layer is 16-26, and the twisting direction of the twisting layer in the adjacent aluminum alloy conducting layer is opposite. When the inner reinforcing core is formed by twisting 19 reinforcing core wires (the outer reinforcing core wires are 2 layers), the twisting layer pitch-diameter ratio of 6 reinforcing core wires in the inner layer is 16-26, the twisting layer pitch-diameter ratio of 12 reinforcing core wires in the outer layer is 14-22, and the twisting direction of the twisting layers in the adjacent aluminum alloy conducting layers is opposite.
In the invention, when the number of the aluminum alloy conducting layers is more than or equal to 2, the twisting direction of the outermost heat-resistant aluminum alloy conducting layer is the right direction, the twisting directions of any two adjacent heat-resistant aluminum alloy conducting layers are opposite, and the pitch diameter ratio of the outer heat-resistant aluminum alloy conducting layer is not more than that of the adjacent inner heat-resistant aluminum alloy conducting layer. Furthermore, the hinge layer pitch diameter ratio of the heat-resistant aluminum alloy conducting layer on the outermost layer is 10-12, and the hinge layer pitch diameter ratio of the heat-resistant aluminum alloy conducting layer on the innermost layer is 10-16.
Referring to fig. 1 and 2, in the present invention, the cross section of the heat-resistant aluminum alloy wire may be "trapezoid" or "SZ" shape, which aims to increase the aluminum filling coefficient from 75% to more than 90% and reduce the diameter of the wire by about 10% under the condition that the cross section of the transmission aluminum is not changed, and as known from the theory related to hydrodynamics, the acting force of the wire in unit length in the wind speed direction is directly proportional to the diameter of the wire, so that the acting force of the wire in wind can be effectively reduced, that is, the wire has the function of reducing wind pressure; meanwhile, as the 'ladder' or 'SZ' molded lines have smooth surfaces and compact structures, and supercooled water drops and ice and snow are not easy to gather on the surfaces of the wires, the galloping probability of the wires in ice and snow days is reduced, and the snow-covered ice-covered wire has better snow-covered and ice-covered characteristics.
In the invention, the central reinforcing core wire and the outer layer reinforcing core wire are preferably both aluminum-coated invar steel wires with the electric conductivity of 10% IACS or 14% IACS, and compared with galvanized steel wires with the same specification, the electric conductivity is higher, so that the inner reinforcing core wire has a power transmission function, and the alternating current and direct current resistance of the wire is effectively reduced; and because no potential difference exists between the inner reinforcing core and the adjacent heat-resistant aluminum alloy conducting layer, the inner reinforcing core has the characteristic of excellent electrochemical corrosion resistance and can be used for a long time.
In the invention, the heat-resistant aluminum alloy wire is preferably a high-conductivity heat-resistant aluminum alloy wire with the conductivity of 61.8% IACS, the maximum temperature of the heat-resistant aluminum alloy wire allowed to be used for a long time can reach 150 ℃, the maximum temperature is improved by 80 ℃ compared with the common aluminum material, and the heat-resistant aluminum alloy wire has the following advantages compared with the steel-cored aluminum stranded wire and the steel-cored heat-resistant aluminum alloy:
the specification of the high-conductivity heat-resistant aluminum alloy stranded wire is the same as that of the common steel-cored aluminum stranded wire, and the capacity of current transmission at the use temperature of 150 ℃ can reach 1.5 times and more than that of the steel-cored aluminum stranded wire at 70 ℃.
b, the high-conductivity heat-resistant aluminum alloy stranded wire has the same specification as the steel-cored heat-resistant aluminum alloy stranded wire, the capacity of the current transmitted at the use temperature of 150 ℃ can reach more than 1.02 times of that of the steel-cored heat-resistant aluminum alloy stranded wire, and the energy loss of the power transmission line per kilometer can be reduced to be less than 97.5 percent of that of the steel-cored heat-resistant aluminum alloy stranded wire.
The invention also provides a manufacturing method of the 61.8 percent IACS high-conductivity heat-resistant aluminum alloy wire, which comprises the following steps:
1. process route
FIGS. 3 and 4 are process routes of 60% IACS Al-alloy wire and 61.8% IACS Al-alloy wire, respectively.
2. Specific preparation process
1) Optimization of alloy element proportion
The conductivity and mechanical properties of the material matrix are improved by performing key management and control on the purity of the aluminum ingot and sensitive elements of impurities; the main alloying element ratios are shown in the following table.
2) Optimization of continuous casting and rolling process
Compared with 60% IACS heat-resistant aluminum alloy material, 61.8% IACS heat-resistant aluminum alloy material increases the online processing step of aluminum boron alloy wire feeding at the runner part of the continuous casting and rolling process, has the speed of (0.5-1) m/min, and can be adjusted according to actual conditions. The boron element and the zirconium element are used for reacting, the zirconium element is changed from a solid solution state to a free state, the conductivity of the rolled rod material is improved, and other process control methods are completely consistent.
3) Heat treatment of aluminum alloy rods
a. Process scheme
| Heat treatment temperature C | Heat treatment time h |
| 200±5 | 10±1 |
b. Purpose(s) to
The conductivity of the heat-resistant aluminum alloy rod manufactured by the alloy element proportion optimization and the continuous casting and rolling process optimization reaches 61.4-61.6% IACS, and the tensile strength reaches 124-135 MPa. By adopting a special process treatment method of aluminum alloy rod heat treatment, the conductivity of the heat-resistant aluminum alloy rod can be improved to 61.8% -62.1% IACS, the tensile strength is reduced to 118-128 MPa, and the 1-time conductivity is improved.
4) Heat treatment of aluminum alloy wire
After the heat-resistant aluminum alloy rod (the electric conductivity is 61.8% -62.1% IACS, the tensile strength is 118-128 MPa) is subjected to plastic processing of 8-13 die drawing wires, the electric conductivity of the heat-resistant aluminum alloy wire is reduced to 61.5% -61.8% IACS, and the tensile strength is improved to 180-188 MPa. At the moment, a special process treatment method for heat treatment of the aluminum alloy wire is added, so that the electric conductivity of the heat-resistant aluminum alloy wire can be effectively improved, but the heat-resistant aluminum alloy wire can also lose part of mechanical properties;
a. process scheme
| Heat treatment temperature C | Heat treatment time h |
| 190±10 | 12±1 |
b. Purpose(s) to
By adopting a special process treatment method of aluminum alloy wire heat treatment, the electric conductivity of the heat-resistant aluminum alloy wire after heat treatment is improved to 61.8-62.0% IACS, the tensile strength is reduced to 170-180 MPa, and the improvement of the 1-time electric conductivity is realized.
In conclusion, in the operation process of the high-conductivity heat-resistant aluminum alloy stranded wire, the stress borne by 61.8 percent of IACS heat-resistant aluminum alloy strands is gradually reduced along with the increase of the operation temperature, the tension of the wire is completely borne by the reinforcing core wire after the temperature of a transition point is reached, and the linear expansion coefficient of the aluminum-coated invar steel strands is the linear expansion coefficient of the wire, so that the wire has excellent high-temperature sag performance, a ladder-shaped or SZ-shaped structure is adopted by combining with an external conducting layer of a novel wire, the diameter of the wire is reduced, the horizontal load of the wire is effectively reduced, the transmission capacity of the wire can be increased by 50 percent or more without replacing a tower, and the construction cost and the construction period are saved.
The high-conductivity heat-resistant aluminum alloy stranded wire provided by the invention adds a wire type selection for the construction of power grids in substation buses, narrow circuit corridors and old circuit capacity increase, realizes large transmission capacity and low sag of a power transmission line, and can effectively reduce the energy loss of the line.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. The high-conductivity heat-resistant aluminum alloy stranded wire is characterized by comprising an internal reinforcing core and a heat-resistant aluminum alloy conducting layer stranded outside the internal reinforcing core;
the inner reinforcing core comprises a central reinforcing core wire, and one or two outer reinforcing core wires are concentrically stranded outside the central reinforcing core wire;
the heat-resistant aluminum alloy conducting layer is formed by concentrically and tightly twisting one or more layers of heat-resistant aluminum alloy wires on the outer side of the inner reinforcing core;
the linear expansion coefficient of the reinforced core wire is less than or equal to 3 x 10-6The coefficient of linear expansion of the heat-resistant aluminum alloy wire is more than or equal to 23 x 10 DEG C-6/℃。
2. The aluminum alloy stranded wire with high electric conductivity and heat resistance as claimed in claim 1, wherein the central reinforcing core wire and the outer reinforcing core wire are both aluminum-clad invar steel wires with electric conductivity of 10% IACS or 14% IACS.
3. The stranded wire of claim 1, wherein the heat-resistant aluminum alloy wire is a high-conductivity heat-resistant aluminum alloy wire with a conductivity of 61.8% IACS.
4. The high-conductivity heat-resistant aluminum alloy stranded wire according to claim 1, wherein when the inner reinforcing core is formed by stranding 7 reinforcing core wires, the stranding layer pitch ratio of 6 reinforcing core wires in the outer layer is 16-26, and the stranding direction of the stranding layers in the adjacent aluminum alloy conducting layers is opposite.
5. The high-conductivity heat-resistant aluminum alloy stranded wire according to claim 1, wherein when the inner reinforcing core is formed by stranding 19 reinforcing core wires, the stranding layer pitch ratio of 6 reinforcing core wires in the inner layer is 16-26, and the stranding layer pitch ratio of 12 reinforcing core wires in the outer layer is 14-22, and is opposite to the stranding direction of the stranding layers in the adjacent aluminum alloy conductive layers.
6. The high-conductivity heat-resistant aluminum alloy stranded wire according to claim 1, wherein when the number of the aluminum alloy conductive layers is 2 or more, the twisting direction of the outermost heat-resistant aluminum alloy conductive layer is the right direction, the twisting directions of any two adjacent heat-resistant aluminum alloy conductive layers are opposite, and the pitch-diameter ratio of the outer heat-resistant aluminum alloy conductive layer is not more than that of the adjacent inner heat-resistant aluminum alloy conductive layer.
7. The high-conductivity heat-resistant aluminum alloy stranded wire according to claim 6, wherein the stranding pitch ratio of the outermost heat-resistant aluminum alloy conducting layer is 10-12, and the stranding pitch ratio of the innermost heat-resistant aluminum alloy conducting layer is 10-16.
8. The high-conductivity heat-resistant aluminum alloy stranded wire as recited in claim 1, wherein the cross section of the heat-resistant aluminum alloy wire is in a shape of a trapezoid or an SZ.
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| CN202011400055.3A CN112582096A (en) | 2020-12-03 | 2020-12-03 | High-conductivity heat-resistant aluminum alloy stranded wire |
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| CN111564251A (en) * | 2020-06-10 | 2020-08-21 | 江苏亨通电力特种导线有限公司 | Aluminum alloy stranded wire and manufacturing method thereof |
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2020
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050279527A1 (en) * | 2004-06-17 | 2005-12-22 | Johnson Douglas E | Cable and method of making the same |
| JP2011146232A (en) * | 2010-01-14 | 2011-07-28 | Viscas Corp | Overhead transmission line |
| CN103952600A (en) * | 2014-04-30 | 2014-07-30 | 国家电网公司 | High-toughness high-conductivity heat resistant aluminium alloy material used for manufacturing overhead conductors of power transmission lines |
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