CN203444849U - Overhead insulated cable - Google Patents
Overhead insulated cable Download PDFInfo
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- CN203444849U CN203444849U CN201320452314.6U CN201320452314U CN203444849U CN 203444849 U CN203444849 U CN 203444849U CN 201320452314 U CN201320452314 U CN 201320452314U CN 203444849 U CN203444849 U CN 203444849U
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Abstract
An overhead insulated cable comprises a conductor, an insulating layer and a shielding layer; the conductor includes tensile cores and soft aluminum alloy wires which are adopted as a conductor portion, wherein the soft aluminum alloy wires are tightly stranded on the tensile cores; the insulating layer includes an cross-linked polyethylene insulating layer and an insulation shielding layer; the shielding layer comprises a conductor shielding layer; the insulation shielding layer has an insulating effect and a shielding effect simultaneously; the conductor shielding layer, the cross-linked polyethylene insulating layer and the insulation shielding layer are subjected to co-extrusion cross-linking processing so as to be tightly wrapped on the conductor in a one-step extrusion manner; and the tensile cores, the soft aluminum alloy wires, the conductor shielding layer, the cross-linked polyethylene insulating layer and the insulation shielding layer are distributed sequentially from inside to outside. The overhead insulated cable is advantageous in high conductivity, excellent thermal stability, low sag and excellent self-damping performance. With the insulating layer adopted, effective isolation between the conductor and air can be realized, and corrosion resistance and external force destruction-prevention performance of the conductor can be improved.
Description
Technical field
The utility model relates to power transmission and distribution field, be specifically related to a kind ofly be applicable to be subject to the nature factors such as many forests, many dusts, many salt fogs, many thunders and lightnings to affect serious regional aerial insulated cable, particularly a kind of middle pressure overhead insulating power transmission cable that is applicable to 35kV level.
Background technology
In power transmission and distribution field, the power transmission lines of China nearly 90% is comprised of aerial condutor, and these aerial condutors are plain conductor mostly, particularly in 110kV～500kV ultra-high-tension power transmission line, has accounted for especially the overwhelming majority.But the high speed development along with China's economy and urbanization; to the conveying of electric energy, require also more and more higher; particularly for some, be subject to nature factor to affect serious area; as the trees area of coverage, contamination by dust district, salt air corrosion district etc.; general overhead bare conductor is because being subject to the impact of surrounding environment; often can cause some electric power fire incidents, make reliability, the security facing problems of electrical network.For addressing this problem, the application of insulated cable in supply line is more and more, existing insulated cable mainly comprises buried insulated cable and aerial insulated cable, the buried insulated cable huge with respect to excavation project, aerial insulated cable has that cost is low, small investment, installation easily, safeguard and overhaul more convenient, the easy advantage of finding and fix a breakdown etc., therefore aerial insulated cable, in China, is particularly used widely in the power distribution networks such as urban street, inside plants, residential quarters.
35kV level aerial insulated cable is as a kind of Novel overhead insulated cable, mainly be used in and be subject to nature factor to affect serious area, one of its benefit is effectively to dwindle the radius of electricity supply of 35kV level bare wire electrical network, make 35kV and above distribution transformer (transformer station) away from down town, the electric power safety of the 35kV level of national grid is transported in user's power distribution network of population intensive community relative to Architectural Equipment, but compare with the 10kV level aerial cable using in city, because 35kV level aerial insulated cable need to increase insulation thickness pro rata, but also need to increase insulating barrier, the number of plies of screen, the Unit Weight (being the cable weight of the unit length under the long-pending the same terms of cross-sectional area of conductor) of 35kV level aerial insulated cable is increased substantially, therefore the specification requirement of its tensile strength is also high a lot of than 10kV level aerial cable, and modern transmission line requires more and more higher for the low arc drop that sets up cable, thereby more must increase the tensile strength of aerial insulated cable, the mechanical performance such as thermally-stabilised.In addition, the coefficient that presses of conductor is one of key factor determining insulated cable quality, the long-pending magnitude relationship of cross-sectional area of conductor arrives the ability to transmit electricity of cable, this requires to promote the tensile strength of cable simultaneously, the series of technical of the sectional area that presses coefficient, conductor of conductor, comprising the structure problem of cable.
Summary of the invention
The purpose of this utility model is to provide a kind of aerial insulated cable that has overcome above-mentioned prior art defect, its structure can not only meet conduction, the insulation of 35kV level aerial insulated cable, the designing requirement of shielding, but also have that tensile strength is high, thermal stability and the good feature of self-damping.In addition,, by the optimal design of the construction of cable, make 35kV level aerial insulated cable cross-sectional area of conductor can expand 630 square millimeters to, conductor compacting coefficient can bring up to 0.93, conductance can reach 61.5%IACS, and light unit weight and tensile strength are strong, can better meet the requirement of low arc drop.
The purpose of this utility model realizes by following technical proposals: aerial insulated cable comprises conductor, insulating barrier and screen, it is characterized in that described conductor comprises tensile core 1 and as the soft aluminium alloy molded line 2 of conductor part, described soft aluminium alloy molded line 2 presses and is stranded in tensile core 1.Described insulating barrier comprises crosslinked polyetylene insulated layer 4 and insulation screen 5, described screen comprises conductor shield 3 and insulation screen 5, described insulation screen 5 has insulation and shielding action simultaneously, and described conductor shield 3, crosslinked polyetylene insulated layer 4 and insulation screen 5 adopt three-layer co-extruded cross-linking the disposable manufacture of extruding tightly to wrap on described conductor; And described tensile core 1, soft aluminium alloy molded line 2, conductor shield 3, crosslinked polyetylene insulated layer 4, insulation screen 5 arrange successively from inside to outside.
Preferably, the thickness range of described crosslinked polyetylene insulated layer 4 is 9.3mm to 10.5mm.
Preferably, the sectional area of described conductor is one of 300 square millimeters, 400 square millimeters, 500 square millimeters or 630 square millimeters.
Preferably, the radical structure of described tensile core 1 is 1+6 root architecture or single structure.
Preferably, described tensile core 1 is the zinc-plated steel core of moulding.
Preferably, the cross sectional shape after described soft aluminium alloy molded line 2 employing annealing in process is trapezoidal or S shape or Z-shaped soft aluminium alloy molded line.
Accompanying drawing explanation
Fig. 1 is the cross-sectional structure schematic diagram of the aerial insulated cable of the first embodiment of the present utility model, and the cross sectional shape of the soft aluminium alloy molded line 2 in figure is trapezoidal.
Fig. 2 is the cross-sectional structure schematic diagram of the aerial insulated cable of the second embodiment of the present utility model, and the cross sectional shape of the soft aluminium alloy molded line 2 in figure is S shape or Z-shaped.
The parts that play same function in figure adopt identical numbering, and the name of these unit numbers is called:
1-tensile core;
2-soft aluminium alloy molded line;
3-conductor shield;
4-crosslinked polyetylene insulated layer;
5-insulation screen.
Embodiment
The embodiment providing below in conjunction with accompanying drawing 1 to 2, further illustrates the embodiment of aerial insulated cable of the present utility model.Aerial insulated cable of the present utility model is not limited to the description of following examples.
Fig. 1,2 is respectively the cross-sectional structure schematic diagram of the aerial insulated cable of first, second embodiment of the present utility model, and the cross sectional shape of the soft aluminium alloy molded line 2 in Fig. 1 is trapezoidal, and the cross sectional shape of the soft aluminium alloy molded line 2 in Fig. 2 is S shape or Z-shaped.Aerial insulated cable of the present utility model comprises conductor, insulating barrier and screen, and described conductor comprises tensile core 1 and as the soft aluminium alloy molded line 2 of conductor part, and described soft aluminium alloy molded line 2 presses and is stranded in tensile core 1.Described insulating barrier comprises the crosslinked polyetylene insulated layer 4 of XLPE and insulation screen 5, described screen comprises conductor shield 3 and insulation screen 5, described insulation screen 5 has insulation and shielding action simultaneously, and the crosslinked polyetylene insulated layer 4 of described conductor shield 3, XLPE and insulation screen 5 adopt three-layer co-extruded cross-linking the disposable manufacture of extruding tightly to wrap on described conductor; And described tensile core 1, soft aluminium alloy molded line 2, conductor shield 3, the crosslinked polyetylene insulated layer 4 of XLPE, insulation screen 5 arrange successively from inside to outside.
Referring to Fig. 1 or Fig. 2, conductor consists of tensile core 1 and trapezoidal or S shape or Z-shaped soft aluminium alloy molded line 2, and soft aluminium alloy molded line 2 presses and is stranded in tensile core 1.Soft aluminium alloy molded line 2 is comprised of many molded line, by routine stranded, to press apparatus for production line and operation stranded and be pressed in tensile core 1 by many molded line, forms the conductor structure as shown in Fig. 1 or 2.The radical structure of tensile core 1 is 1+6 root architecture, adopts 1, center heart yearn as shown in Figure 1, 2 to add the version of 6 heart yearns around.Certainly, 1+6 root architecture is a kind of preferred scheme of tensile core 1, the radical structure that another kind of preferred version is tensile core 1 is single structure (not shown), the version of only having 1 heart yearn in center, the radical structure of tensile core 1 can require and stranded, to press operation condition design according to the tensile strength of cable, considers and improves the requirement of pressing coefficient and reducing sag degree.The preferred extra-heavy tensile core of tensile core 1 of the present utility model, as adopt the zinc-plated steel core of moulding, because it not only has very high tensile strength, but also have good conductance, the physical property such as thermally-stabilised, the zinc-plated steel core of moulding also has desirable cost performance.It is trapezoidal or S shape or Z-shaped soft aluminium alloy molded line that soft aluminium alloy molded line 2 preferably adopts the cross sectional shape after annealing in process, because conductance and the elongation of the soft aluminium alloy molded line after annealed processing have obtained desirable improvement, in addition, soft aluminium alloy molded line deliquescing after processing, add its trapezoidal or S shape or Z-shaped cross sectional shape make each molded line between very compact, thereby be conducive to improve, press coefficient.By selecting zinc-plated steel core, made up the problem of soft aluminium alloy molded line pull-off force deficiency, and steel core outside is by adopting " trapezoidal " or " S shape or Z-shaped " soft aluminium alloy molded line to press stranded, greatly improved the coefficient that presses of conductor, improved the utilance of the equal external diameter situation of conductor lower section, and " trapezoidal " or " S shape or Z-shaped " soft aluminium alloy type line structure is very compact, more shatter-proof, there is very good self-damping performance, and soft aluminium alloy conductor has good thermal stability, its conductance can reach 61.5%IACS, compare with duralumin, hard alumin ium alloy, line loss can reduce 8%, improved the energy saving of cable.Soft aluminium alloy wire has higher elongation simultaneously, be 20%～30%, more much higher than the elongation of common duralumin, hard alumin ium alloy line (1%～3%), when working temperature is during higher than wire migration point, the mechanical stress of wire is all transferred on steel core, by steel core, born whole tension force of wire, because steel core has good softening properties, can at the temperature compared with high, work and not reduce its mechanical strength, when wire working temperature improves, the degree of speeding of same time wire changes little, is not subject to the impact of line thigh long-term creep, makes wire have very good self-damping performance.Therefore this cable is not only applicable to newly-built circuit, is also well suited for the transformation of old circuit.
The sectional area of described conductor is related to aerial insulated cable ability to transmit electricity, limited by the construction of cable, the sectional area expansion of conductor is restricted, the conductor structure of aerial insulated cable of the present utility model, the mode that particularly tensile core 1 and soft aluminium alloy molded line 2 combine, realized cable conductor cross section by the leap of 300 square millimeters to 630 square millimeters, the sectional area of conductor can select arbitrarily in 300 square millimeters, 400 square millimeters, 500 square millimeters or 630 square millimeters.Because the electric field strength of 35kV and following mesolow class F insulation cable is not high, so under the prerequisite that insulation thickness requires in the regulation that meets 35kV operating voltage, the thickness of insulating barrier increases without the increase of the sectional area with conductor, therefore, cable conductor cross section is not only to have promoted the ability to transmit electricity of cable by the meaning of the leap of 300 square millimeters to 630 square millimeters, but also the increase proportion that is insulating barrier weight is less, this reduces sag for aerial insulated cable is a factor favourable.
Described insulating barrier comprises crosslinked polyetylene insulated layer 4 and insulation screen 5, and the thickness range of described XLPE insulating barrier 4 is 9.3mm to 10.5mm.Certainly, thickness value within the scope of this of crosslinked polyetylene insulated layer 4 is a kind of preferred schemes, the thickness of crosslinked polyetylene insulated layer 4 is crossed the thin insulation property that may make can not be up to standard, and blocked up may the making troubles to setting up of thickness of crosslinked polyetylene insulated layer 4 also can be aggravated sag simultaneously.Described screen comprises conductor shield 3 and insulation screen 5, the insulation screen 5 here has shielding and insulation function simultaneously, by three-layer co-extruded cross-linking production line, complete conductor shield 3, crosslinked polyetylene insulated layer 4 and the disposable of insulation screen 5 and extrude, conductor shield 3, crosslinked polyetylene insulated layer 4 and insulation screen 5 tightly wrap on conductor.In this so-called three-layer co-extruded and disposable mode of extruding, it is conventional a kind of production line manufacturing process, the structure that tensile core 1 of the present utility model, soft aluminium alloy molded line 2, conductor shield 3, crosslinked polyetylene insulated layer 4, insulation screen 5 arrange successively from inside to outside, the fine manufacturing process that is adapted to this routine of energy, without increasing special process equipment and technique.
The following describes the manufacture process of power cable of the present utility model, first according to total pull-off force of conductor, choose a zinc-plated steel core meeting the demands, then adopt " trapezoidal " or " S shape or Z-shaped " soft aluminium alloy molded line to be stranded on zinc-plated steel core as conductor part, last outside conductor by three-layer co-extruded cross-linking production line complete conductor screen, crosslinked polyetylene insulated, the disposable of insulation shielding extruded.
The utility model improves by the structure of cable, not only improved cable insulation security performance, realized wire and air is effectively isolated, improved the corrosion resistance of cable conductor, but also when meeting the requirement of the tensile strength that safe and reliable low arc drop sets up, realize cross-sectional area of conductor and expanded 630 square millimeters to by 300 square millimeters, conductor compacting coefficient has brought up to 0.93 by 0.9, conductance can reach 61.5%IACS, soft aluminium alloy wire has higher elongation simultaneously, be 20%～30%, more much higher than the elongation of common duralumin, hard alumin ium alloy line (1%～3%), can bring into play better the low arc drop performance of wire, be specially adapted to rated voltage 35kV and the following nature factor that is subject to, as: many forests, many dusts, many salt fogs, the area that the impact such as many thunders and lightnings is serious.
Claims (6)
1. an aerial insulated cable, comprises conductor, insulating barrier and screen, it is characterized in that:
Described conductor comprises tensile core (1) and as the soft aluminium alloy molded line (2) of conductor part, and described soft aluminium alloy molded line (2) presses and is stranded in tensile core (1);
Described insulating barrier comprises crosslinked polyetylene insulated layer (4) and insulation screen (5), described screen comprises conductor shield (3) and insulation screen (5), described insulation screen (5) has insulation and shielding action simultaneously, and described conductor shield (3), crosslinked polyetylene insulated layer (4) and insulation screen (5) adopt three-layer co-extruded cross-linking the disposable manufacture of extruding tightly to wrap on described conductor; And
Described tensile core (1), soft aluminium alloy molded line (2), conductor shield (3), crosslinked polyetylene insulated layer (4), insulation screen (5) arrange successively from inside to outside.
2. aerial insulated cable according to claim 1, is characterized in that: the thickness range of described crosslinked polyetylene insulated layer (4) is 9.3mm to 10.5mm.
3. aerial insulated cable according to claim 1, is characterized in that: the sectional area of described conductor is one of 300 square millimeters, 400 square millimeters, 500 square millimeters or 630 square millimeters.
4. aerial insulated cable according to claim 1, is characterized in that: the radical structure of described tensile core (1) is 1+6 root architecture or single structure.
5. aerial insulated cable according to claim 1, is characterized in that: described tensile core (1) is the zinc-plated steel core of moulding.
6. aerial insulated cable according to claim 1, is characterized in that: it is trapezoidal or S shape or Z-shaped soft aluminium alloy molded line that described soft aluminium alloy molded line (2) adopts the cross sectional shape after annealing in process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320452314.6U CN203444849U (en) | 2013-07-27 | 2013-07-27 | Overhead insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320452314.6U CN203444849U (en) | 2013-07-27 | 2013-07-27 | Overhead insulated cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203444849U true CN203444849U (en) | 2014-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320452314.6U Expired - Fee Related CN203444849U (en) | 2013-07-27 | 2013-07-27 | Overhead insulated cable |
Country Status (1)
| Country | Link |
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| CN (1) | CN203444849U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108154964A (en) * | 2016-12-05 | 2018-06-12 | 苏永义 | Insulated conductor is pressed in a kind of anti-lightning strike broken string |
| CN108269654A (en) * | 2016-12-30 | 2018-07-10 | 杭州电缆股份有限公司 | A kind of middle jewelling alloy overhead insulated cable and preparation method thereof |
| CN109994279A (en) * | 2017-10-31 | 2019-07-09 | 矢崎总业株式会社 | Communication wire and harness |
-
2013
- 2013-07-27 CN CN201320452314.6U patent/CN203444849U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108154964A (en) * | 2016-12-05 | 2018-06-12 | 苏永义 | Insulated conductor is pressed in a kind of anti-lightning strike broken string |
| CN108269654A (en) * | 2016-12-30 | 2018-07-10 | 杭州电缆股份有限公司 | A kind of middle jewelling alloy overhead insulated cable and preparation method thereof |
| CN109994279A (en) * | 2017-10-31 | 2019-07-09 | 矢崎总业株式会社 | Communication wire and harness |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140219 Termination date: 20200727 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |