CN202221672U - DC 110 kV cross-linked polyethylene insulation single-core overland cable - Google Patents
DC 110 kV cross-linked polyethylene insulation single-core overland cable Download PDFInfo
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- CN202221672U CN202221672U CN2011202802418U CN201120280241U CN202221672U CN 202221672 U CN202221672 U CN 202221672U CN 2011202802418 U CN2011202802418 U CN 2011202802418U CN 201120280241 U CN201120280241 U CN 201120280241U CN 202221672 U CN202221672 U CN 202221672U
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- 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
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- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The utility model provides a DC 110 kV cross-linked polyethylene insulation single-core overland cable including a conductor. A conductor gird wraps the conductor. A three-layer co-extruding production technique is adopted for an outer layer of the conductor gird. A conductor shielding layer, a cross-linked polyethylene insulation layer, an insulation shielding layer, a waterproof buffer layer wrapping the insulation shielding layer, a metal sheath outside the waterproof buffer layer and an outer sheath outside the metal sheath are extruded for wrapping from the inside to the outside in a single process. The DC 110 kV cross-linked polyethylene insulation single-core overland cable in the utility model can bear 110 kV DC working voltage, 160 kV polarity inversion voltage and 310 kV DC voltage superposition transient over voltage. Thus, the DC 110 kV cross-linked polyethylene insulation single-core overland cable in the utility model can be applied to a 110 kV DC power transmission line and work reliably in a long term. The DC 110 kV cross-linked polyethylene insulation single-core overland cable in the utility model keeps a normal insulation state under different conditions of normal working, current inversion, switch operation, and lightening impact, thereby realize safe power supply. And a MW level transmission capacity is provided. At the same time, the DC 110 kV cross-linked polyethylene insulation single-core overland cable in the utility model can bear mechanical forces in transporting, laying and operating and actions of a surrounding environment, thereby meeting requirements of overland laying and long term running.
Description
Technical field
The utility model relates to the high voltage direct current cable technical field, is specifically related to the crosslinked polyetylene insulated single core overland cable of a kind of direct current 110kV.
Background technology
Along with related key technical problem in the direct current transportation is able to solve in recent years gradually, direct current transportation begins constantly to display with respect to the advantage of ac transmission.Direct current transportation has following advantage than ac transmission.
1) transfer efficiency is high, and line loss is little.
2) regulate electric current and change the power direction of transfer conveniently.
3) though converter is higher than transformer cost, DC line lacks than exchanging with line, and investment cost is few, and the long distance line direct current is saved money than exchanging.
4) length of direct current cables does not receive the restriction of capacitance current, and this is for crossing straits, transmitting electricity comparatively favourable to the island.
5) DC power transmission line can be used as the tie of two kinds of electrical networks, even two kinds of mains frequencies can not use simultaneously yet, and it can also reduce the short circuit current between backbone and electrical network.
6) the corona radio interference of DC line is little.
Direct current transportation obtains to greatly develop in global electric power system, and up to now, oil-filled cable is still high pressure and the most reliable pattern of superhigh voltage DC cable.The domestic extreme high voltage grade direct current overhead transmission line that built up and put into operation does not still have the operating experience of direct current cables circuit.But some long apart from electric energy transmitting, cross river, application scenario such as over strait, the actual demand of existing direct current cables circuit is put on agenda.
Successful Application along with thousands of kilometers polyethylene insulation seabed transmission cables; In the fifties in 19th century; The potentiality of polyethylene insulated cable in the high-voltage applications of direct current seabed begin to be familiar with and to study; But polyethylene and crosslinked polyethylene direct current cables are breakdown easily in the polarity inversion test, and this has hindered its commercial application.It has been generally acknowledged that this is owing to have captive space charge in the cable insulation.
In the nineties in 19th century, it is to use the interest that has all caused commercial aspect again as seabed or land that the development of new insulation material and new current conversion station makes polyethylene and crosslinked polyethylene extrude the insulated type direct current cables.There are the documents and materials published to show,, can effectively improve its problems with space charge, thereby make cross-linked polyethylene insulated cable can be applicable to high direct voltage/superhigh pressure field through polyethylene raw material doped nanoparticle etc. is carried out modification.At present, pressure and high-voltage cross-linking polythene direct current cables were used the polyethylene material during the large-scale material supplier of existing several families can provide in a large number in the world.
Say that from production equipment and technological requirement crosslinked polyetylene insulated direct current cables and ac cable do not have essential distinction.But; Because the voltage form and the amplitude of when operation, bearing are different, insulation characterisitic difference is very remarkable, and the physical dimension of crosslinked polyetylene insulated direct current cables and ac cable are diverse; Can not the physical dimension of ac cable be indiscriminately imitated and be used for direct current cables; Need on the basis of carrying out corresponding reliability test exploration, accomplish the work of insulation system design, confirm the structure and the size of XLPE direct current cables.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists; The purpose of the utility model is to provide a kind of direct current 110kV crosslinked polyetylene insulated single core overland cable; Can bear the 110kV direct-current working volts, 160kV polarity inversion voltage and 310kV direct voltage stack temporary overvoltage move thereby can be applied to the 110kV DC power transmission line reliably and with long-term; The normal condition that under operate as normal, electric current switching-over, operation and the various situation of lightning impulse, keeps insulation is to realize safe power supply.
To achieve these goals, the utility model adopts following technical scheme:
The crosslinked polyetylene insulated single core overland cable of a kind of direct current 110kV; Comprise conductor 1; At conductor 1 outerwrap conductor band 2, adopt three-layer co-extruded production technology at the skin of said conductor band 2, the disposable from inside to outside conductor screen 3, crosslinked polyetylene insulated 4 and insulation shielding 5 that extrudes; Be wrapped in the water-blocking buffer layer 6 outside the insulation shielding 5, be extruded in the metallic sheath 7 outside the water-blocking buffer layer 6 and be extruded in the oversheath 8 outside the metallic sheath 7.
Said conductor 1 adopts and forms copper stranded pressing of single line, and cross section is a circular configuration, and sectional area is 400mm
2, 630mm
2Or 800mm
2, corresponding copper wire diameter and quantity are respectively 3.0mm * 60,3.75mm * 60 or 3.52mm * 89, and corresponding core external diameter is respectively 23.8mm, 30.0mm or 34.0mm.
Said conductor band 2 materials are the semiconductive nylon tape, and thickness is 0.14～0.16mm.
The material of said conductor screen 3 and insulation shielding 5 is semiconductive ultra-smooth direct current shielding material, and thickness is 1.0mm.
Said crosslinked polyetylene insulated 4 adopt 110kV level direct current cables with ultra-clean cross-linked polyethylene insulating material continuous extrusion, thickness 10.0mm.
Said water-blocking buffer layer 6 is by wrapped the forming of imbibition band with semiconductive characteristic, and the thickness of water-blocking buffer layer is 2.0mm.
Said metallic sheath 7 materials are aluminium, and metallic sheath adopts the form of aluminum extruded back corrugating to process, and metallic sheath 7 thickness are 2.0mm, and the ripple height is 4.0～4.5mm.
Said oversheath 8 adopts the polythene material continuous extrusion, and thickness is 3.5mm.
For under the 110kV direct voltage, land lays the medium-term and long-term reliability service of environment; The technical scheme that the utility model adopted is; Using copper is that main insulation, wrinkle aluminium are metallic sheath as conductor, crosslinked polyethylene; Polyethylene is the overall structure that oversheath constitutes the major function layer, has following advantage:
(1) selecting copper is conductor material, and discharge capacity is big;
(2) the outer wrapped semiconductive nylon tape of conductor prevents to infiltrate the single line slit when conductor screen from extruding, and with economical with materials, reduces cost;
(3) use conductor screen and insulation shielding and effectively improve electric field, prevent partial discharge, improve electric property; Produce the main insulation of cable with crosslinked polyethylene D.C. isolation material; Thickness is 10.0mm; The needs of long-term direct-current working volts both can have been satisfied; Can bear simultaneously the requirement of polarity inversion and DC stacked temporary overvoltage to insulation, and problems such as the blocked up waste of raw materials that causes that prevents to insulate, the outside diameter of cable are big, transportation and laying installation difficulty; Crosslinked polyethylene main insulation and conductor screen, insulation shielding are extruded for three layers jointly, to improve the performance of insulated cable; Conductor screen and insulation shielding adopt ultra-smooth direct current shielding material, and the interface of the ultra-smooth between insulating material and the shielding material can be provided, and this is a key factor of guaranteeing cable long-term behaviour reliability; And crosslinked polyetylene insulated employing ultra-clean material can farthest reduce gathering of space charge, improves the electrical property of direct current cables greatly;
(4) water-blocking buffer layer of employing 2.0mm thickness; Have the imbibition characteristic, can prevent moisture, protect cable insulation to avoid that high temperature in the metallic sheath extrusion is scalded and the mechanical force damage during corrugating simultaneously along the cable axial dispersion; In addition; This layer has the semiconductive characteristic, can realize effectively electrically contacting of metallic sheath and insulation shielding through it, prevents by internal field and concentrates the partial discharge that causes;
(5) adopt the metal sheath of corrugated aluminum sheath as cable; And adopt the whole technology of extruding the back corrugating, and thickness is 2.0mm, wave height is 4.0～4.5mm; Can bear the mechanical force of installing when laying and moving; Also can play the radially function of waterproof simultaneously, and less bending radius and Corrosion Protection preferably can be provided, adapt to the needs that land is laid;
(6) adopt the outer jacket of pe sheath as cable, thickness is 3.5mm, effectively waterproof and protect metallic sheath to avoid the environment electrochemical corrosion.
Exchanging twisted polyethylene cable with the 110kV of identical electric pressure compares; The insulation of the utility model direct current 110kV crosslinked polyethylene single-core cable is thinner; The outside diameter of cable reduces, and has not only practiced thrift raw material, and for the production of cable, transport, lay all highly beneficial; And the transmission capacity of DC line has remarkable increase than the alternating current circuit under the same case, and transfer efficiency is high, and line loss is little; In addition, the long-term operation performance of DC line has a distinct increment than the alternating current circuit usually.
Description of drawings
Fig. 1 is the utility model cable radial structure sketch map.
Fig. 2 is the utility model cable axial arrangement sketch map.
Fig. 3 is the sketch map of the utility model cable directly buried installation in soil.
The sketch map that Fig. 4 lays in the tunnel for the utility model cable.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done more detailed explanation.
Like Fig. 1, shown in Figure 2; The utility model is the crosslinked polyetylene insulated single core overland cable of a kind of direct current 110kV, comprises conductor 1, at conductor 1 outerwrap conductor band 2; Skin at said conductor band 2 adopts three-layer co-extruded production technology; The disposable from inside to outside conductor screen 3, crosslinked polyetylene insulated 4 and insulation shielding 5 that extrudes is wrapped in the outer water-blocking buffer layer 6 of insulation shielding 5, is extruded in the outer metallic sheath 7 of water-blocking buffer layer 6 and is extruded in the outer oversheath 8 of metallic sheath 7.
Said conductor 1 adopts and forms copper stranded pressing of single line, and cross section is a circular configuration, and sectional area is 400mm
2, 630mm
2Or 800mm
2, corresponding copper wire diameter and quantity are respectively 3.0mm * 60,3.75mm * 60 or 3.52mm * 89, and corresponding core external diameter is respectively 23.8mm, 30.0mm or 34.0mm.
Said conductor band 2 materials are the semiconductive nylon tape, and thickness is 0.14～0.16mm.
The material of said conductor screen 3 and insulation shielding 5 is semiconductive ultra-smooth direct current shielding material, and thickness is 1.0mm.
Said crosslinked polyetylene insulated 4 adopt 110kV level direct current cables to form with ultra-clean cross-linked polyethylene insulating material continuous extrusion, and thickness is 10.0mm.
Said water-blocking buffer layer 6 is by wrapped the forming of imbibition band with semiconductive characteristic, and the thickness of water-blocking buffer layer is 2.0mm.
Said metallic sheath 7 materials are aluminium, and metallic sheath adopts the form of aluminum extruded back corrugating to process, and metallic sheath 7 thickness are 2.0mm, and the ripple height is 4.0～4.5mm.
Said oversheath 8 adopts the polythene material continuous extrusion, and thickness is 3.5mm.
As shown in Figure 3, cable directly is embedded in underground mode of laying, not only simply but also economical, used very extensive.The general step of cable directly buried installation is: at first at design attitude excavation cable trough; Require the bending radius of its degree of depth, width and corner to satisfy the requirement of laying of cable line; Cable trough is spread the thick sandy soil of 100mm at bottom of trench after digging also acceptance(check), and cabling 9.Various cable layings are when same ditch, and high-tension cable is positioned at the bottom, and low-voltage cable separates with the thick fine sand 10 of 50～100mm between the various cables in the superiors.All cable layings are covered thick fine sand or weak soil layer with 100mm after accomplishing and in ditch, put neatly on the superiors' cable, cover prefabricated concrete protective cover plate 11 then, cable is provided certain mechanical protection, prevent the external force damage; But replace cover plate in the location that is not vulnerable to mechanical damage also tile work, afterwards, begin cable trough is carried out backfill, during backfill soil; Should note removing ratchel and other foreign material, and every backfill 200～300mm compacting once, piles high 100～200mm at last on the ground, in case the formation zanjon that sinks that loosens the soil; Having under the situation of requirement, ground grading, last; Stake is buried in place in regulation underground, and so far, the cable directly buried installation finishes.
As shown in Figure 4, the mode that cable is laid in the tunnel is applicable to cable line highly dense location or the bigger section of path difficulty, at present in large-and-medium size cities and stride the river, the applications in sea is more excessively.It is circular or square that the cable tunnel is generally; Tunnel wall adopts steel bar concrete reinforcement, and support is installed angle steel 14 and is fixed on the tunnel wall, and angle bar frame 13 is fixed on support and installs on the angle steel 14; Cable laying on angle bar frame 13, every at a distance from a segment distance adopt anchor clamps or tie up restrict carry out effectively fixing.In the tunnel, usually according to being disposed in order from top to bottom: cross-linked polyethylene insulated cable 12, oil-filled cable 16, communication, power, mains lighting supply cable 17 install the groove box 15 of preventing fires additional to improve its fire protecting performance oil-filled cable 16 outside.The operation maintenance personnel carry out work such as laying installation, walkaround inspection in the tunnel for ease, at tunnel top configuration illuminating lamp distribution pipe 18, and damp-proof fluorescent lamp 19 are installed, so that effective lighting to be provided.
The operation principle of the utility model is: after cable laying is accomplished; Head end links to each other with rectifying device, and end links to each other with the inversion device, and direct current passes through from the copper core conductor of cable; And direct voltage is applied on cable crosslinked polyetylene insulated, and electric energy is sent to end from cable head.
Claims (8)
1. crosslinked polyetylene insulated single core overland cable of direct current 110kV; Comprise conductor (1); It is characterized in that: at conductor (1) outerwrap conductor band (2); Skin at said conductor band (2) adopts three-layer co-extruded production technology; Disposable from inside to outside conductor screen (3), crosslinked polyetylene insulated (4) and the insulation shielding (5) of extruding is wrapped in the outer water-blocking buffer layer (6) of insulation shielding (5), is extruded in the outer metallic sheath (7) of water-blocking buffer layer (6) and is extruded in the outer oversheath (8) of metallic sheath (7).
2. cable according to claim 1 is characterized in that: said conductor (1) adopts and forms copper stranded pressing of single line, and cross section is a circular configuration, and sectional area is 400mm
2, 630mm
2Or 800mm
2, corresponding copper wire diameter and quantity are respectively 3.0mm * 60,3.75mm * 60 or 3.52mm * 89, and corresponding core external diameter is respectively 23.8mm, 30.0mm or 34.0mm.
3. cable according to claim 1 is characterized in that: said conductor band (2) material is the semiconductive nylon tape, and thickness is 0.14～0.16mm.
4. cable according to claim 1 is characterized in that: the material of said conductor screen (3) and insulation shielding (5) is semiconductive ultra-smooth direct current shielding material, and thickness is 1.0mm.
5. cable according to claim 1 is characterized in that: said crosslinked polyetylene insulated (4) adopt 110kV level direct current cables to form with ultra-clean cross-linked polyethylene insulating material continuous extrusion, and thickness is 10.0mm.
6. cable according to claim 1 is characterized in that: said water-blocking buffer layer (6) is by wrapped the forming of imbibition band with semiconductive characteristic, and the thickness of water-blocking buffer layer (6) is 2.0mm.
7. cable according to claim 1 is characterized in that: said metallic sheath (7) material is an aluminium, and metallic sheath adopts the form of aluminum extruded back corrugating to process, and metallic sheath (7) thickness is 2.0mm, and the ripple height is 4.0～4.5mm.
8. cable according to claim 1 is characterized in that: said oversheath (8) adopts the polythene material continuous extrusion, and thickness is 3.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202802418U CN202221672U (en) | 2011-08-03 | 2011-08-03 | DC 110 kV cross-linked polyethylene insulation single-core overland cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202802418U CN202221672U (en) | 2011-08-03 | 2011-08-03 | DC 110 kV cross-linked polyethylene insulation single-core overland cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202221672U true CN202221672U (en) | 2012-05-16 |
Family
ID=46043695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202802418U Expired - Lifetime CN202221672U (en) | 2011-08-03 | 2011-08-03 | DC 110 kV cross-linked polyethylene insulation single-core overland cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202221672U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103021546A (en) * | 2012-12-21 | 2013-04-03 | 无锡江南电缆有限公司 | 110 kV cross linked polyethylene insulating single-core submarine cable |
| CN103123826A (en) * | 2013-03-22 | 2013-05-29 | 国网电力科学研究院 | High voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation power cable |
| CN103123825A (en) * | 2013-03-22 | 2013-05-29 | 国网电力科学研究院 | High voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation submarine cable |
| CN105336391A (en) * | 2015-11-26 | 2016-02-17 | 中天科技海缆有限公司 | Flame-retardant water-blocking flexible direct-current high-voltage cable applied to tunnel |
| CN105788733A (en) * | 2015-12-24 | 2016-07-20 | 上海胜华电气股份有限公司 | Large-section mineral-insulated multi-core branched fireproof cable |
| CN105895187A (en) * | 2016-04-20 | 2016-08-24 | 苏州寅泽缕弦电子技术有限公司 | Novel power cable structure |
| CN112563989A (en) * | 2020-11-11 | 2021-03-26 | 宁波东方电缆股份有限公司 | Heat dissipation protection system of land cable and construction method thereof |
-
2011
- 2011-08-03 CN CN2011202802418U patent/CN202221672U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103021546A (en) * | 2012-12-21 | 2013-04-03 | 无锡江南电缆有限公司 | 110 kV cross linked polyethylene insulating single-core submarine cable |
| CN103123826A (en) * | 2013-03-22 | 2013-05-29 | 国网电力科学研究院 | High voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation power cable |
| CN103123825A (en) * | 2013-03-22 | 2013-05-29 | 国网电力科学研究院 | High voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation submarine cable |
| CN103123826B (en) * | 2013-03-22 | 2015-09-16 | 国网电力科学研究院 | High pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable |
| CN103123825B (en) * | 2013-03-22 | 2016-02-03 | 国网电力科学研究院 | High pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulation submarine cable |
| CN105336391A (en) * | 2015-11-26 | 2016-02-17 | 中天科技海缆有限公司 | Flame-retardant water-blocking flexible direct-current high-voltage cable applied to tunnel |
| CN105788733A (en) * | 2015-12-24 | 2016-07-20 | 上海胜华电气股份有限公司 | Large-section mineral-insulated multi-core branched fireproof cable |
| CN105895187A (en) * | 2016-04-20 | 2016-08-24 | 苏州寅泽缕弦电子技术有限公司 | Novel power cable structure |
| CN112563989A (en) * | 2020-11-11 | 2021-03-26 | 宁波东方电缆股份有限公司 | Heat dissipation protection system of land cable and construction method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120516 |
|
| CX01 | Expiry of patent term |