CN116895403A - Low-sag capacity-increasing type low-wind-pressure overhead conductor and preparation method thereof - Google Patents
Low-sag capacity-increasing type low-wind-pressure overhead conductor and preparation method thereof Download PDFInfo
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- CN116895403A CN116895403A CN202310821302.4A CN202310821302A CN116895403A CN 116895403 A CN116895403 A CN 116895403A CN 202310821302 A CN202310821302 A CN 202310821302A CN 116895403 A CN116895403 A CN 116895403A
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- 239000004020 conductor Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 229910001374 Invar Inorganic materials 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 230000007774 longterm Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 230000009466 transformation Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/008—Power cables for overhead application
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/02—Stranding-up
- H01B13/0207—Details; Auxiliary devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/006—Constructional features relating to the conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
-
- 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
Abstract
The application relates to a low sag capacity-increasing type low wind pressure overhead conductor and a preparation method thereof, wherein the conductor consists of a bearing core and a conductive layer, and the conductor comprises the following components: the bearing core is an aluminum-clad steel stranded wire core or an invar steel stranded wire core or a carbon fiber core rod, the conducting layer comprises an inner conducting layer and an outer conducting layer, the inner conducting layer and the outer conducting layer are formed by stranding a plurality of S-shaped, Z-shaped or T-shaped heat-resistant aluminum alloy wires, and the surface of each heat-resistant aluminum alloy wire on the outer conducting layer is provided with a single or a plurality of grooves. The lead is particularly suitable for capacity-increasing transformation of the electric old line of the coastal urban power grid, and can realize line capacity-increasing by more than 60% by utilizing the original pole tower and the transmission channel. Meanwhile, due to the fact that the wind pressure on the surface of the wire is reduced, wind pressure waving of the wire under typhoon conditions can be reduced, and therefore stability and safety of line operation are effectively improved.
Description
Technical Field
The application relates to the technical field of overhead conductors, in particular to a low-sag capacity-increasing type low-wind pressure overhead conductor and a preparation method thereof.
Background
In recent years, the construction of novel electric power systems is quickened, energy structures are continuously adjusted, electric energy substitution is deeply promoted, and the power generation capacity of the electric power systems is continuously increased. In addition, with the increase of industrial production and life demands of people, the electric load demands are also increasing continuously. The power grid is used as a channel for electric energy transmission and distribution, and is also continuously developed towards a large capacity.
For newly built grids, the transmission capacity is increased, and the transmission capacity is easily increased by increasing the capacity of related components. But for existing grids, it is relatively difficult to increase transmission capacity. In particular, the old line is removed and rebuilt due to the influence of the line path, the removal cost, the construction period and other factors.
For coastal cities, old lines of the power grid are reformed, and besides factors such as line paths, removal cost, construction period and the like, the influence of typhoons is considered. The typhoons are statistically mostly above 25 m/s in wind speed. According to the simulated wind tunnel test, the surface wind pressure of the common overhead conductor is continuously increased along with the increase of wind speed, and under the typhoon condition, the conductor is collided due to wind pressure, so that accidents such as wire burn-off, strand breakage and wire breakage, hardware wear, line tripping, even tower dumping and the like are caused, and a lot of potential safety hazards exist.
Disclosure of Invention
The embodiment of the application aims to provide a low-sag capacity-increasing type low-wind-pressure overhead conductor and a preparation method thereof, and the wind pressure fluctuation of the conductor under typhoon conditions can be reduced due to the reduction of the wind pressure on the surface of the conductor, so that the stability and the safety of line operation are effectively improved.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, embodiments of the present application provide a low sag, capacity-increasing low wind pressure overhead conductor, the conductor comprising a load-bearing core and a conductive layer, wherein: the bearing core is an aluminum-clad steel stranded wire core or an invar steel stranded wire core or a carbon fiber core rod, the conducting layer comprises an inner conducting layer and an outer conducting layer, the inner conducting layer and the outer conducting layer are formed by stranding a plurality of S-shaped, Z-shaped or T-shaped heat-resistant aluminum alloy wires, and the surface of each heat-resistant aluminum alloy wire on the outer conducting layer is provided with a single or a plurality of grooves.
The inner layer and the outer layer of the conductive layer adopt 8+12 structures, namely 8 heat-resistant aluminum alloy wires are stranded to form the inner layer of the conductive layer, and 12 heat-resistant aluminum alloy wires are stranded to form the outer layer of the conductive layer.
And a single groove is formed in the surface of each heat-resistant aluminum alloy wire on the outer layer of the conductive layer, the single groove is designed along the axial direction of the wire, and the cambered surface radius of the groove is 0.6mm.
Two grooves are formed in the surface of each heat-resistant aluminum alloy wire on the outer layer of the conductive layer, the two grooves are designed along the axial direction of the wire, and the cambered surface radius of each groove is 0.4mm.
When the bearing core is an aluminum-clad steel stranded wire core, 7 aluminum-clad steel wires with the diameter of 3.18mm are stranded into the bearing core, and the tensile strength of the aluminum-clad steel wires is not less than 1770MPa and the elongation at break is not less than 2%.
When the bearing core is a carbon fiber core rod, 1 carbon fiber core rod with the diameter of 8.0mm is used as the bearing core, the minimum tensile strength of the carbon fiber core rod is 2400MPa, and the long-term allowable use temperature is 160 ℃.
In a second aspect, an embodiment of the present application provides a method for manufacturing a low sag, capacity-increasing type low wind pressure overhead conductor, including the steps of:
twisting 7 aluminum-clad steel wires with the diameter of 3.18mm into a bearing core, wherein the tensile strength of the aluminum-clad steel wires is not less than 1770MPa, and the elongation at break is not less than 2%;
stranding 8Z-shaped heat-resistant aluminum alloy wires with the equivalent circle diameter of 4.72mm on a bearing core to form an inner layer of a conductive layer;
twisting 12S-shaped heat-resistant aluminum alloy wires with the equivalent circle diameter of 4.72mm on the inner layer of the conductive layer to form the outer layer of the conductive layer;
each S-shaped heat-resistant aluminum alloy wire is provided with two longitudinal grooves, and the cambered surface radius of each groove is 0.4mm.
Another embodiment of the present application provides a method for manufacturing a low sag capacity-increasing type low wind pressure overhead conductor, comprising the steps of:
carbon fiber core rods are used as bearing cores, the minimum tensile strength of the carbon fiber core rods is 2400MPa, and the long-term allowable use temperature is 160 ℃;
stranding 8Z-shaped heat-resistant aluminum alloy wires with the equivalent circle diameter of 4.83mm on a bearing core to form an inner layer of a conductive layer;
twisting 12S-shaped heat-resistant aluminum alloy wires with the equivalent circle diameter of 4.83mm on the inner layer of the conductive layer to form 1 longitudinal groove on each S-shaped heat-resistant aluminum alloy wire on the outer layer of the conductive layer, wherein the cambered surface radius of the groove is 0.6mm 。
Compared with the prior art, the application has the beneficial effects that:
the low-sag capacity-increasing type low-wind pressure overhead conductor is suitable for capacity-increasing reconstruction of old and old lines in coastal cities or large wind areas.
The low sag capacity-increasing type low wind pressure overhead conductor has the following advantages: compared with the steel-cored aluminum strand with the same diameter, the conductive section of the wire is increased by 5-10%, and the running temperature is increased from 70 degrees to more than 150 degrees. The transmission capacity is improved by more than 60 percent, and when the span of the overhead wire is 300-500 meters, the sag is reduced by more than 1.5 meters. When the wind speed is above 25 m/s, the wind pressure can be reduced by about 30 percent. The lead is particularly suitable for capacity increasing and changing of the electric old line of coastal city power gridThe original towers and transmission channels can be utilized to realize the line capacity increase of more than 60%. Meanwhile, due to the fact that the wind pressure on the surface of the wire is reduced, wind pressure waving of the wire under typhoon conditions can be reduced, and therefore stability and safety of line operation are effectively improved 。
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of an overhead conductor of a first embodiment;
fig. 2 is a schematic cross-sectional structure of an overhead conductor of the second embodiment.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. 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.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The terms "first," "second," and the like, are used merely to distinguish one entity or action from another entity or action, and are not to be construed as indicating or implying any actual such relationship or order between such entities or actions.
As shown in fig. 1, an embodiment of the present application provides a low sag capacity-increasing low wind pressure overhead conductor, which is composed of a carrier core 1 and a conductive layer, wherein: the bearing core 1 is an aluminum clad steel stranded wire core or an invar steel stranded wire core or a carbon fiber core rod, the conductive layer comprises a conductive layer inner layer 2 and a conductive layer outer layer 3, the conductive layer inner layer 2 and the conductive layer outer layer 3 are formed by stranding a plurality of S-shaped, Z-shaped or T-shaped heat-resistant aluminum alloy wires, and the surface of each heat-resistant aluminum alloy wire of the conductive layer outer layer is provided with a single or a plurality of grooves.
Example 1
As shown in fig. 1, the low sag capacity-increasing type low wind pressure overhead conductor of the present embodiment includes: 1. a load bearing core; 2. an inner layer of the conductive layer; 3. and an outer layer of the conductive layer.
The preparation method comprises the following steps:
7 aluminum-clad steel wires with the diameter of 3.18mm are twisted into the bearing core 1, and the tensile strength of the aluminum-clad steel wires is not less than 1770MPa and the elongation at break is not less than 2%. 8Z-shaped heat-resistant aluminum alloy wires with the equivalent circular diameter of 4.72mm are stranded on the bearing core 1 to form the conducting layer inner layer 2, the tensile strength of the heat-resistant aluminum alloy wires is not less than 225MPa, the conductivity is not less than 55% IACS, and the continuous operation temperature (40 years) is allowed to be 150 ℃. 12S-shaped heat-resistant aluminum alloy wires with the equivalent circular diameter of 4.72mm are stranded on the bearing core 1 to form the conducting layer outer layer 3, the tensile strength of the heat-resistant aluminum alloy wires is not less than 225MPa, the conductivity is not less than 55% IACS, the continuous operation temperature (40 years) is allowed to be 150 ℃, each S-shaped heat-resistant aluminum alloy wire is provided with two longitudinal grooves, and the cambered surface radius of each groove is 0.4mm.
The low sag capacity-increasing type low wind pressure overhead conductor 350/55 prepared by the inspection method has 65% higher transmission capacity than steel-cored aluminum stranded wires with the same diameter, and sag is reduced by 2 meters when the span of the overhead wire is 400 meters. In wind tunnel test, the wind speed is 25 m/s, and the wind resistance coefficient is 0.83.
Example 2
As shown in fig. 2, as shown in fig. 1, the low sag capacity-increasing type low wind pressure overhead conductor of the present embodiment includes: 1. a load bearing core; 2. an inner layer of the conductive layer; 3. and an outer layer of the conductive layer.
As shown in fig. 2, the low sag capacity-increasing type low wind pressure overhead conductor of the present embodiment includes: 1. a load bearing core; 2. an inner layer of the conductive layer; 3. and an outer layer of the conductive layer.
The preparation method comprises the following steps:
1 carbon fiber core rod with the diameter of 8.0mm is used as a bearing core 1, the minimum tensile strength of the carbon fiber core rod is 2400MPa, and the long-term allowable use temperature is 160 ℃. 8Z-shaped heat-resistant aluminum alloy wires with the equivalent circular diameter of 4.83mm are stranded on the bearing core 1 to form the conducting layer inner layer 2, the tensile strength of the heat-resistant aluminum alloy wires is not less than 155MPa, the conductivity is not less than 60% IACS, and the continuous operation temperature (40 years) is allowed to be 150 ℃. 12S-shaped heat-resistant aluminum alloy wires with the equivalent circular diameter of 4.83mm are stranded on the bearing core 1 to form the conducting layer outer layer 3, the tensile strength of the heat-resistant aluminum alloy wires is not less than 155MPa, the conductivity is not less than 60% IACS, the continuous operation temperature (40 years) is allowed to be 150 ℃, each S-shaped heat-resistant aluminum alloy wire is provided with 1 longitudinal groove, and the cambered surface radius of the groove is 0.6mm.
The low sag capacity-increasing type low wind pressure overhead conductor 370/40 prepared by the inspection of the embodiment has 68% higher transmission capacity compared with steel-cored aluminum stranded wires with the same diameter, and sag is reduced by 3 meters when the span of the overhead conductor is 400 meters. In wind tunnel test, the wind speed is 25 m/s, and the wind resistance coefficient is 0.84.
The low sag capacity-increasing type low wind pressure overhead conductor has the following advantages: compared with the steel-cored aluminum strand with the same diameter, the conductive section of the wire is increased by 5-10%, and the running temperature is increased from 70 degrees to more than 150 degrees. The transmission capacity is improved by more than 60 percent, and when the span of the overhead wire is 300-500 meters, the sag is reduced by more than 1.5 meters. When the wind speed is above 25 m/s, the wind pressure can be reduced by about 30 percent. The lead is particularly suitable for capacity-increasing transformation of the electric old line of the coastal city power grid, and can realize the capacity increase of the line by more than 60% by utilizing the original pole tower and the transmission channel. Meanwhile, due to the fact that the wind pressure on the surface of the wire is reduced, wind pressure waving of the wire under typhoon conditions can be reduced, and therefore stability and safety of line operation are effectively improved.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The utility model provides a low sag capacity-increasing type low wind pressure air wire which characterized in that, the wire comprises load-bearing core and conducting layer, wherein: the bearing core is an aluminum-clad steel stranded wire core or an invar steel stranded wire core or a carbon fiber core rod, the conducting layer comprises an inner conducting layer and an outer conducting layer, the inner conducting layer and the outer conducting layer are formed by stranding a plurality of S-shaped, Z-shaped or T-shaped heat-resistant aluminum alloy wires, and the surface of each heat-resistant aluminum alloy wire on the outer conducting layer is provided with a single or a plurality of grooves.
2. The low sag capacity-increasing type low-wind pressure overhead conductor according to claim 1, wherein the inner conductive layer and the outer conductive layer adopt a structure of 8+12, namely 8 heat-resistant aluminum alloy wires are stranded to form an inner conductive layer, and 12 heat-resistant aluminum alloy wires are stranded to form an outer conductive layer.
3. The low sag capacity-increasing type low wind pressure overhead conductor according to claim 1, wherein a single groove is formed in the surface of each heat-resistant aluminum alloy wire on the outer layer of the conductive layer, the single groove is designed along the axial direction of the conductor, and the cambered surface radius of the groove is 0.6mm.
4. The low sag capacity-increasing type low wind pressure overhead conductor according to claim 1, wherein two grooves are formed in the surface of each heat-resistant aluminum alloy wire on the outer layer of the conductive layer, the two grooves are designed along the axial direction of the conductor, and the cambered surface radius of each groove is 0.4mm.
5. The low sag capacity-increasing type low wind pressure overhead conductor according to claim 1, wherein when the bearing core is an aluminum clad steel stranded wire core, 7 aluminum clad steel wires with the diameter of 3.18mm are stranded into the bearing core, and the tensile strength of the aluminum clad steel wires is not less than 1770MPa and the elongation at break is not less than 2%.
6. The low sag and capacity increasing type low wind pressure overhead conductor according to claim 1, wherein when the bearing core is a carbon fiber core rod, 1 carbon fiber core rod with a diameter of 8.0mm is used as the bearing core, the minimum tensile strength of the carbon fiber core rod is 2400MPa, and the long-term allowable use temperature is 160 ℃.
7. The preparation method of the low-sag capacity-increasing type low-wind pressure overhead conductor is characterized by comprising the following steps of:
twisting 7 aluminum-clad steel wires with the diameter of 3.18mm into a bearing core, wherein the tensile strength of the aluminum-clad steel wires is not less than 1770MPa, and the elongation at break is not less than 2%;
stranding 8Z-shaped heat-resistant aluminum alloy wires with the equivalent circle diameter of 4.72mm on a bearing core to form an inner layer of a conductive layer;
twisting 12S-shaped heat-resistant aluminum alloy wires with the equivalent circle diameter of 4.72mm on the inner layer of the conductive layer to form the outer layer of the conductive layer;
each S-shaped heat-resistant aluminum alloy wire is provided with two longitudinal grooves, and the cambered surface radius of each groove is 0.4mm.
8. The preparation method of the low-sag capacity-increasing type low-wind pressure overhead conductor is characterized by comprising the following steps of:
carbon fiber core rods are used as bearing cores, the minimum tensile strength of the carbon fiber core rods is 2400MPa, and the long-term allowable use temperature is 160 ℃;
stranding 8Z-shaped heat-resistant aluminum alloy wires with the equivalent circle diameter of 4.83mm on a bearing core to form an inner layer of a conductive layer;
12S-shaped heat-resistant aluminum alloy wires with the equivalent circular diameter of 4.83mm are stranded on the inner layer of the conductive layer, so that 1 longitudinal groove is formed on each S-shaped heat-resistant aluminum alloy wire on the outer layer of the conductive layer, and the cambered surface radius of the groove is 0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310821302.4A CN116895403A (en) | 2023-07-06 | 2023-07-06 | Low-sag capacity-increasing type low-wind-pressure overhead conductor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310821302.4A CN116895403A (en) | 2023-07-06 | 2023-07-06 | Low-sag capacity-increasing type low-wind-pressure overhead conductor and preparation method thereof |
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| Publication Number | Publication Date |
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| CN116895403A true CN116895403A (en) | 2023-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310821302.4A Pending CN116895403A (en) | 2023-07-06 | 2023-07-06 | Low-sag capacity-increasing type low-wind-pressure overhead conductor and preparation method thereof |
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| Country | Link |
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| CN (1) | CN116895403A (en) |
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- 2023-07-06 CN CN202310821302.4A patent/CN116895403A/en active Pending
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