CN110148496A - A kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type - Google Patents
A kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type Download PDFInfo
- Publication number
- CN110148496A CN110148496A CN201910288063.4A CN201910288063A CN110148496A CN 110148496 A CN110148496 A CN 110148496A CN 201910288063 A CN201910288063 A CN 201910288063A CN 110148496 A CN110148496 A CN 110148496A
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- China
- Prior art keywords
- conducting wire
- conducting
- wire
- layer
- multiply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 25
- 229910001374 Invar Inorganic materials 0.000 title claims abstract description 24
- 239000004411 aluminium Substances 0.000 title claims abstract description 24
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 13
- 239000004020 conductor Substances 0.000 claims abstract description 26
- 238000005728 strengthening Methods 0.000 claims abstract description 11
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- DNXNYEBMOSARMM-UHFFFAOYSA-N alumane;zirconium Chemical compound [AlH3].[Zr] DNXNYEBMOSARMM-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- H01B7/0045—Cable-harnesses
-
- 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
- H01B7/1805—Protections not provided for in groups H01B7/182 - H01B7/26
- H01B7/1815—Protections not provided for in groups H01B7/182 - H01B7/26 composed of longitudinal inserts
-
- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
-
- 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
-
- 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 present invention relates to a kind of low wind pressure conducting wires of aluminium packet invar steel core superalloy type；Belting layer is coated on outside strengthening core；Inner conducting layer is formed by the first wire stranding of multiply, and the first conducting wire is circumferentially distributed in outside belting layer, tangent to each other between the first conducting wire of multiply；Conductive layer includes the second conducting wire of multiply in master, second conducting wire is circumferentially distributed in outside inner conducting layer, second conducting wire and the first wire crossbar are distributed, and per share second conducting wire is tangent simultaneously with two strand of first adjacent conducting wire, wherein spaced between two strand of second conducting wire of arbitrary neighborhood；Conductive layer includes multiply privates in pair, and per share privates is arranged among the interval, and tangent with two strand of second adjacent conducting wire and the first conducting wire simultaneously；Outer conducting layer is coated on outside middle conductive layer, and outer conducting layer is twisted by multiply abnormity conductor wire, and the special-shaped conductor wire of arbitrary neighborhood is formed with V-shaped groove on the outer surface of outer conducting layer, and V-shaped groove is towards inner recess.
Description
Technical field
The present invention relates to leader cable fields, and in particular to a kind of low wind pressure of aluminium packet invar steel core superalloy type is led
Line.
Background technique
With the progress of science and technology, the voltage class of route is higher and higher, and the distribution of china natural resources and east economy
Fast development, determine China's transmission line of electricity present extra-high voltage, the transportation characteristics of long range.
The main problem encountered in extra-high voltage, long distance delivery route is: one, building " a galvanic electricity according to Utilities Electric Co.
The requirement of net ", overhead power line should have the characteristics that resource-conserving and environmentally friendly.With the increase of voltage class,
The corona loss of conducting wire on the line causes the extensive attention of scientific research personnel, really, by increasing the area of conducting wire to increase
Big wire diameter can reduce corona phenomenon, and still, the increasing of entire route one-time construction cost can be caused by increasing conductor cross-section
Add；Two, Ultra-high Voltage Wire can pass through different climatic provinces during long distance delivery, and the conducting wire by wind pressure accounts for whole route
60% or so or even some transmission lines of electricity can pass through strong wind area, and in strong wind area in addition to conducting wire intensity itself need to be amenable to wind
Load test is outer, and tower bar needs to bear the power that conducting wire is passed over by wind load and tower bar itself and made by the resultant force of wind load
With.Wind load how is reduced, conducting wire and steel tower safety in operation are improved, how under the premise of guaranteeing transmission capacity, reduces line
Road overall cost reduces corona loss, prevents Electromagnetic Interference, be current urgent problem to be solved.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of low wind pressure of aluminium packet invar steel core superalloy type to lead
Line, to solve the problems, such as proposed in background technique.
In order to achieve the above object, the present invention is achieved by the following technical programs: a kind of aluminium packet invar steel core ultra heat resisting aluminum
The low wind pressure conducting wire of alloy-type, it is characterised in that: including outer conducting layer, middle conductive layer, inner conducting layer, belting layer and strengthening core；
Belting layer is coated on outside strengthening core；Inner conducting layer is formed by the first wire stranding of multiply, and the first conducting wire circumferentially divides
Cloth is tangent to each other between the first conducting wire of multiply outside belting layer；
Middle conductive layer includes conductive layer and conductive layer in pair in main；Conductive layer includes the second conducting wire of multiply in master, and second leads
Line is circumferentially distributed in outside inner conducting layer, and the second conducting wire and the first wire crossbar are distributed, and per share second conducting wire with it is adjacent
Two strand of first conducting wire simultaneously it is tangent, it is wherein spaced between two strand of second conducting wire of arbitrary neighborhood；Conductive layer includes in pair
Multiply privates, per share privates are arranged among the interval, and simultaneously with two strand of second adjacent conducting wire and
One conducting wire is tangent；
Outer conducting layer is coated on outside middle conductive layer, and outer conducting layer is twisted by multiply abnormity conductor wire, arbitrary neighborhood
Special-shaped conductor wire be formed with V-shaped groove on the outer surface of outer conducting layer, V-shaped groove is towards inner recess.
Preferably, the periphery of the second conducting wire and the periphery of privates and the same circumference inscribe.
Preferably, middle conductive layer is twisted by the second conducting wire with privates, the strand of direction of lay and inner conducting layer
It closes contrary.
Preferably, strengthening core is aluminium packet invar steel core, is formed by more aluminium packet invar silk concentric strandings.
Preferably, the first conducting wire, the second conducting wire and privates are heat resistant aluminum alloy wire.
Preferably, the outer surface of special-shaped conductor wire is plane, and the peripheral shape of outer conducting layer is conductive by multiply abnormity
The regular polygon that line medial plane is constituted.
Preferably, it is recessed inwardly to form arc-shaped concave at the outer surface center of special-shaped conductor wire.
Compared to the prior art, the beneficial effects of the present invention are the second conducting wires and the first conducting wire of conductive layer in (1) main
Be interspersed, the privates in pair in conductive layer is arranged between two strand of second conducting wire, and simultaneously with adjacent two strand second
Conducting wire and the first conducting wire are tangent, so that cable overall structure becomes more compact, in the case where same outer diameter, can have
Bigger conductive section improves section utilization rate, effectively increases transmission line capability, and reduce the corona of cable surface；(2)
The peripheral shape of outer conducting layer is regular polygon, and has multiple V-shaped grooves, thus constitute a kind of non-cylinder, have wheel
The fairing shape of Guo, and the outer surface roughness of outer conducting layer is increased, high speed can be made to blow to the layer of cable conductor windward side
It flows wind and generates directional separation, collision, recirculating zone cannot be formed at the cable conductor back side, so that cable conductor entirety wind pressure reduces,
Cable conductor wind shake is dynamic to be reduced.
Detailed description of the invention
Fig. 1 is cross-sectional view of the invention；
Each appended drawing reference is as follows:
1, outer conducting layer；2, conductive layer in pair；3, conductive layer in master；4, inner conducting layer；5, belting layer；6, strengthening core；7,
Arc-shaped concave；8, V-shaped groove.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.Term "inner",
The orientation or state relation of the instructions such as "upper", "lower" are orientation based on the figure or state relation, are merely for convenience of retouching
It states the present invention and simplifies description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific
Orientation construction and operation, therefore be not considered as limiting the invention；Description and claims of this specification and on
Stating the term " first " in attached drawing, " second " etc. is to be used to distinguish similar objects, without for describe specific sequence or
Precedence.It should be understood that the data used in this way are interchangeable under appropriate circumstances, so as to reality of the invention described herein
Apply example.
The low wind pressure conducting wire of a kind of aluminium packet invar steel core superalloy type as shown in Figure 1, including outer conducting layer 1, in lead
Electric layer, inner conducting layer 4, belting layer 5 and strengthening core 6；
Belting layer 5 is coated on outside strengthening core 6；Inner conducting layer 4 is formed by the first wire stranding of multiply, and the first conducting wire is circumferential
It is distributed in outside belting layer 5, it is tangent to each other between the first conducting wire of multiply；
Middle conductive layer includes conductive layer 3 and conductive layer 2 in pair in main；In master conductive layer 3 include the second conducting wire of multiply, second
Conducting wire is circumferentially distributed in outside inner conducting layer 4, and the second conducting wire and the first wire crossbar are distributed, and per share second conducting wire with phase
Two strand of first adjacent conducting wire is tangent simultaneously, wherein spaced between two strand of second conducting wire of arbitrary neighborhood；Conductive layer 2 wraps in pair
Include multiply privates, per share privates is arranged among the interval, and simultaneously with adjacent two strand of second conducting wire and
First conducting wire is tangent；
Outer conducting layer 1 is coated on outside middle conductive layer, and outer conducting layer 1 is twisted by multiply abnormity conductor wire, any phase
Adjacent special-shaped conductor wire is formed with V-shaped groove 8 on the outer surface of outer conducting layer 1, and V-shaped groove 8 is towards inner recess.
In the present embodiment, strengthening core 6 is aluminium packet invar steel core, is formed by more aluminium packet invar silk concentric strandings.Aluminium packet Yin
Steel wire is to have aluminium layer composition in invar silk external sheath.Invar is a kind of iron-nickel alloy material of low thermal coefficient of expansion, and heat is swollen
Swollen coefficient is 2.8 × 10-6/ DEG C, so the linear expansion coefficient of aluminium packet invar steel core is extremely low, when conducting wire is when higher temperature works, is led
The arc sag of line not will increase very much, and line energizing flow amount is improved, so that the temperature limit of conducting wire be made to greatly improve.
Belting layer 5 is specially PTFE tape in the present embodiment, and belting layer 5 prevents from turning round in bending for the strengthening core 6 that is fastened
Turn to cause to misplace between aluminium packet invar silk when cable, while the existing higher heat resistance of PTFE material, and has preferable
Flame retardant property can preferably protect cable.
In the present embodiment, the first conducting wire, the second conducting wire and privates are heat resistant aluminum alloy wire, and heat resistant aluminum alloy wire is
A kind of aluminium Zirconium alloy material line of resistance to 210 DEG C~230 DEG C high temperature, conductivity 60%IACS, the transmission that cable can be improved are held
Amount.
In the present embodiment, less than the outer diameter of the second conducting wire, the outer diameter of the second conducting wire leads less than first for the outer diameter of privates
The outer diameter of line, after being arranged in this way, convenient for the second conducting wire with the first conducting wire is tangent is interspersed, but also the periphery of the second conducting wire and
It the periphery of privates can be with the same circumference inscribe, so that cable overall structure becomes more compact, in same outer diameter
In the case where, there can be bigger conductive section, improve section utilization rate, effectively increase transmission line capability, and reduce electricity
The corona on cable surface.
In the present embodiment, middle conductive layer is twisted by the second conducting wire with privates, direction of lay and inner conducting layer 4
Direction of lay it is opposite.
In the present embodiment, the inner side plane of special-shaped conductor wire is arc surface, and both side surface is plane, and outer surface is also flat
Face, the peripheral shape of outer conducting layer 1 are the regular polygon that is made of multiply abnormity conductor wire medial plane, are positive 12 here
Side shape；In the present embodiment, the periphery edge of special-shaped conductor wire is handled by fillet, thus in adjacent special-shaped conductor wire contact
V-shaped groove is formd at position, thus constitute a kind of non-cylinder, have the fairing shape of wheel Guo, furthermore special-shaped conductive
It is also recessed inwardly to form arc-shaped concave 7 at the outer surface center of line, the outer surface for further increasing outer conducting layer 1 is coarse
Degree, the laminar winds that high speed can be made to blow to cable conductor windward side generate directional separation, collision, cannot be formed at the cable conductor back side
Recirculating zone, so that cable conductor entirety wind pressure reduces, cable conductor wind shake is dynamic to be reduced.
More than, it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any
Those familiar with the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its invents
Design is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type, it is characterised in that: including outer conducting layer (1), in lead
Electric layer, inner conducting layer (4), belting layer (5) and strengthening core (6)；
It is external that belting layer (5) is coated on strengthening core (6)；Inner conducting layer (4) is formed by the first wire stranding of multiply, the first conducting wire week
It is external to belting layer (5) is distributed in, it is tangent to each other between the first conducting wire of multiply；
Middle conductive layer includes conductive layer (2) in conductive layer (3) in master and pair；Conductive layer (3) includes the second conducting wire of multiply in master, the
Two conducting wires are circumferentially distributed in inner conducting layer (4) outside, and the second conducting wire and the first wire crossbar are distributed, and per share second conducting wire is equal
It is tangent simultaneously with two strand of first adjacent conducting wire, it is wherein spaced between two strand of second conducting wire of arbitrary neighborhood；It is conductive in pair
Layer (2) include multiply privates, per share privates is arranged among the interval, and simultaneously with adjacent two strand second
Conducting wire and the first conducting wire are tangent；
Outer conducting layer (1) is coated on outside middle conductive layer, and outer conducting layer (1) is twisted by multiply abnormity conductor wire, any phase
Adjacent special-shaped conductor wire is formed with V-shaped groove (8) on the outer surface of outer conducting layer (1), and V-shaped groove (8) is towards inner recess.
2. a kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type according to claim 1, it is characterised in that:
The periphery of two conducting wires and the periphery of privates and the same circumference inscribe.
3. a kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type according to claim 1, it is characterised in that: in
Conductive layer is twisted by the second conducting wire with privates, and direction of lay is opposite with the direction of lay of inner conducting layer (4).
4. a kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type according to claim 1, it is characterised in that: add
Qiang Xin (6) is aluminium packet invar steel core, is formed by more aluminium packet invar silk concentric strandings.
5. a kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type according to claim 1, it is characterised in that:
One conducting wire, the second conducting wire and privates are heat resistant aluminum alloy wire.
6. a kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type according to claim 1, it is characterised in that: different
The outer surface of shape conductor wire is plane, and the peripheral shape of outer conducting layer (1) is by multiply abnormity conductor wire medial plane institute structure
At regular polygon.
7. a kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type according to claim 1, it is characterised in that: different
It is recessed inwardly to form arc-shaped concave (7) at the outer surface center of shape conductor wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910288063.4A CN110148496A (en) | 2019-04-11 | 2019-04-11 | A kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910288063.4A CN110148496A (en) | 2019-04-11 | 2019-04-11 | A kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110148496A true CN110148496A (en) | 2019-08-20 |
Family
ID=67588523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910288063.4A Pending CN110148496A (en) | 2019-04-11 | 2019-04-11 | A kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110148496A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582096A (en) * | 2020-12-03 | 2021-03-30 | 国网辽宁省电力有限公司丹东供电公司 | High-conductivity heat-resistant aluminum alloy stranded wire |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5711143A (en) * | 1995-04-15 | 1998-01-27 | The Kansai Electric Power Co., Inc. | Overhead cable and low sag, low wind load cable |
| JP2000243143A (en) * | 1999-02-22 | 2000-09-08 | Furukawa Electric Co Ltd:The | Overhead electric wire |
| US20010017219A1 (en) * | 1998-05-13 | 2001-08-30 | Naoshi Kikuchi | Overhead cable |
| CN205943561U (en) * | 2016-06-21 | 2017-02-08 | 江苏亨通电力特种导线有限公司 | Low -wind -pressure conducting wire |
| JP2017063006A (en) * | 2015-09-25 | 2017-03-30 | 古河電気工業株式会社 | Conductor and coated cable |
| CN209625893U (en) * | 2019-04-11 | 2019-11-12 | 安徽电气集团股份有限公司 | A kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type |
-
2019
- 2019-04-11 CN CN201910288063.4A patent/CN110148496A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5711143A (en) * | 1995-04-15 | 1998-01-27 | The Kansai Electric Power Co., Inc. | Overhead cable and low sag, low wind load cable |
| US20010017219A1 (en) * | 1998-05-13 | 2001-08-30 | Naoshi Kikuchi | Overhead cable |
| JP2000243143A (en) * | 1999-02-22 | 2000-09-08 | Furukawa Electric Co Ltd:The | Overhead electric wire |
| JP2017063006A (en) * | 2015-09-25 | 2017-03-30 | 古河電気工業株式会社 | Conductor and coated cable |
| CN205943561U (en) * | 2016-06-21 | 2017-02-08 | 江苏亨通电力特种导线有限公司 | Low -wind -pressure conducting wire |
| CN209625893U (en) * | 2019-04-11 | 2019-11-12 | 安徽电气集团股份有限公司 | A kind of low wind pressure conducting wire of aluminium packet invar steel core superalloy type |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112582096A (en) * | 2020-12-03 | 2021-03-30 | 国网辽宁省电力有限公司丹东供电公司 | High-conductivity heat-resistant aluminum alloy stranded wire |
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