CN103123826B - High pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable - Google Patents
High pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable Download PDFInfo
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- CN103123826B CN103123826B CN201310094300.6A CN201310094300A CN103123826B CN 103123826 B CN103123826 B CN 103123826B CN 201310094300 A CN201310094300 A CN 201310094300A CN 103123826 B CN103123826 B CN 103123826B
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Abstract
The invention discloses a kind of high pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable, the center of this cable is water-blocking conductor, and water-blocking conductor is coated with semiconductive twining package tape outward successively, extrudes internal shield, extrudes insulating barrier, extrudes outer shielding layer, the first buffering water blocking layer, the second buffering water blocking layer, metallic sheath, nonmetally extrude oversheath and extrude conductive layer; Optical fiber is placed with between buffering water blocking layer.Insulating barrier of the present invention uses the ultra-clean material that adds space charge inhibitor and maximum operation temperature allows 90 DEG C, overcomes the electric field distortion that traditional cable Insulation Material causes because space charge gathers and even punctures; Adopt copper sheathing thus avoid using pitch anticorrosion, solving the clean environment firendly problem in producing and installing, also overcome galvanic corrosion problems; And by extruding conductive layer as test electrode on oversheath, prevent the environmental pollution that traditional cable surface of outer sheath is caused as test electrode by coating graphite guide electric layer.
Description
Technical field
The present invention relates to a kind of direct current cables, especially a kind of flexible DC power transmission optical fiber compound extruded insulated power cable.
Background technology
1997, Article 1 flexible direct current cable put into operation in the world, and supplier is ABB AB.Along with the progress of technology, the electric pressure of operation improves constantly, and the electric pressure of external comercial operation flexible direct current cable is 200 kV at present, and ABB AB has completed the type approval test of 320 kV cables in laboratory.China's power transmission cable mostly is interchange and extrudes insulated cable, only run low pressure (30 kV and following) flexible direct current extrusion insulated cable in Shanghai, and the flexible direct current extrusion insulated cable of middle pressure (30 more than kV are to 150 kV), high pressure (150 more than kV are to 250 kV) and superhigh pressure (250 more than kV are to 500 kV) did not also use.
In China, middle pressure and the most frequently used material of above cable conductor are copper.Copper electric conductivity is excellent, reaches 100 IACS%.In addition, its stable chemical performance, oxidation resistent susceptibility, antiseptic property is excellent, and mechanical strength is large.But the price of copper costly, be generally 3 ~ 4 times of aluminium price.
Traditional direct current cables, its insulated part many employings paper oil insulation structure, i.e. wrapped rectangular cable paper outside the conducting paper of conductor, the air-gap between wrapped paper adopts insulating oil to fill.Filling forms has two kinds, and a kind of is viscosity insulating oil dipping, and be direct current oil-impregnated paper insulation cable, another kind passes into hollow conductor for low viscosity insulating oil, applies certain oil pressure, is direct current oil-filled cable.The direct current cables of paper oil insulation structure, its insulation resistance is not high especially, therefore in insulation not Existential Space electric charge.But after insulating oil leaks, be not easy to decompose, contaminated environment, and cable paper is that choice wood is made, needs to consume the forest reserves.
Because paper oil insulation cable exists not green, not environmentally shortcoming, therefore, develop and extrude cross-linked polyethylene insulated cable.Extrude insulated cable and overcome paper oil insulation cable Problems existing in green and environmental protection, be used in a large number in AC network.
The insulation resistance extruding insulated cable is high especially, and the space charge in insulator is not easily released, if directly used in direct current network, the Electric Field Distribution in space charge distortion cable insulation, causes electric field to concentrate, easily cause cable insulation to puncture.At present, the crosslinked material of the direct current of existing commercialized supply in the world, its working temperature is lower is 70 DEG C, extrudes insulated cable working temperature 90 DEG C lower than existing interchange.Therefore, in the situation of identical voltage same conductor cross section, its ampacity is that the cable of 90 DEG C is much smaller than working temperature, causes transmission line capability much little like this.
In direct current cables runs, the contact whether projection of semi-conductive shield and interfacial dielectric layer, greatly have impact on cable insulation level, and even the insulation life of whole cable.Existing knowledge shows, causes electric field to concentrate produce electrical tree aging process between insulating barrier and semi-conductive shield due to projection, and semiconductive projection also easily produces space charge and injects insulation.
Metallic sheath is the strong together barrier of cable guaranteed reliability; tradition crosslinked cable many employings aluminium cover, the reduction potential of aluminium is-1.66 V, is minimum in cable metal cover material; therefore be embedded in underground and easily cause electrochemical corrosion, this is not suitable for being used in strand or varieties in saline-alkali areas.The aluminium cover of existing cable, in order to anticorrosion, overlaps outer surface one deck pitch at aluminium.This just causes the pollution of workshop environment, in the future when installing terminal and joint, causes pitch be not easy to clean and pollute site environment.
In addition, the nonmetal oversheath of traditional cable, in order to utilize DC break down voltage to check its integrity, needs to arrange electrode at surface of outer sheath, existing usual at surface-coated graphite as test electrode, but the easy contaminated environment of graphite granule.
Summary of the invention
For the deficiency that cable in prior art exists, the object of this invention is to provide a kind of flexible DC power transmission optical fiber compound extruded insulated power cable for high pressure and superhigh pressure, cable cost can be reduced, breakdown strength and the working temperature of cable insulation can be improved, avoid electrochemical corrosion and the cleaned in situ problem of traditional cable metallic sheath, prevent the environmental pollution that traditional cable causes as test electrode due to coating graphite linings.
For achieving the above object, the present invention is by the following technical solutions:
High pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable, the center of this cable is water-blocking conductor, and described water-blocking conductor is coated with semiconductive twining package tape outward successively, extrudes internal shield, extrudes insulating barrier, extrudes outer shielding layer, the first buffering water blocking layer, the second buffering water blocking layer, metallic sheath, nonmetally extrude oversheath and extrude conductive layer; The optical fiber of stainless steel tube protection is also placed with between described first buffering water blocking layer and the second buffering water blocking layer.
The thickness of described semiconductive twining package tape is (0.10 ~ 0.36) mm; Described internal shield thickness of extruding is (1.0 ~ 2.0) mm; Described thickness of insulating layer of extruding is (10.6 ~ 30.0) mm; Described outer shielding layer thickness of extruding is (0.6 ~ 1.5) mm; The thickness of described first buffering water blocking layer, the second buffering water blocking layer is respectively (1 ~ 3) mm; Described metallic sheath thickness is (0.5 ~ 3.8) mm; Described nonmetal oversheath thickness of extruding is (4 ~ 6) mm; Described conductive layer thickness of extruding is (0.4 ~ 1.2) mm.
Further, water-blocking conductor is made up of multiple conducting wires, is arranged in cylindric, in the gap of wire, be filled with material water-proof material, and conductor material is fine aluminium or cable conductor dedicated aluminium alloy or copper; Metallic sheath adopts wrinkle copper sheathing or stainless steel sleeve or aluminium cover; Extrude insulating barrier and adopt mixture through the polyethylene base-material of ultra-clean process, crosslinking agent and space charge inhibitor, working temperature reaches 90 DEG C; Extrude internal shield and extrude outer shielding layer and all use the crosslinked material of ultra-smooth semiconductive; Nonmetal jacket material of extruding is PVC or PE or fire-retardant PE.Also be provided with lettering extruding conductive layer appearance.Optical fiber adopts multimode or single mode, or both combinations, for cable status monitoring, protection information transmission and communication.
Compared to prior art, the present invention has the following advantages: (1), by selecting fine aluminium or cable conductor dedicated aluminium alloy as conductor, is added material water-proof material, can be alleviated cable weight, reduce cable cost significantly; (2) insulating barrier uses the ultra-clean material adding space charge inhibitor, DC breakdown field intensity is greater than 45 kV/mm, and maximum operation temperature reaches 90 DEG C, overcome the electric field distortion that traditional cable Insulation Material causes because space charge gathers and even puncture, and ampacity is larger than 70 DEG C of direct current cables material; (3) by using ultra-smooth semiconductive material, effectively prevent insulating barrier and causing due to projection electric field to concentrate with shield semiconductors interlayer to produce electrical tree aging process, further suppress semiconductive projection and produce the situation that space charge injection insulate; (4) adopt copper sheathing thus avoid using pitch anticorrosion, solving the clean environment firendly problem in producing and installing, also overcoming aluminium cover galvanic corrosion problems; (5) by extruding conductive layer as test electrode on oversheath, carrying out DC break down voltage inspection, preventing the environmental pollution that traditional cable surface of outer sheath is caused as test electrode by coating graphite guide electric layer.
Accompanying drawing explanation
Fig. 1 is the structural representation of power cable of the present invention.
Embodiment
Below in conjunction with Fig. 1 and embodiment, the present invention is described in detail.
As shown in Figure 1, flexible DC power transmission with the structure of optical fiber compound extruded insulated power cable from inside to outside, be followed successively by: water-blocking conductor 1, the how imperial twining package tape of semiconductive spy 2, semiconductive inner shield 3, extrude insulating barrier 4, semiconductive external shield 5, first cushions water blocking layer 6, stainless steel tube optical fiber 7, second cushions water blocking layer 8, corrugated metal cover 9, nonmetal oversheath 10, extrude conductive layer 11, lettering 12.PE base-material is added space charge inhibitor etc. by insulating material of the present invention, PE base-material super-purifying treatment removing impurity, effectively can suppress gathering of electric charge between insulating hollow, improve the cable insulation life-span.Extrude inner shield and the external shield of flexible direct current cable all use the crosslinked material of ultra-smooth semiconductive, prevent the electric field caused due to projection to concentrate and space charge injects insulation.Metallic sheath selects reduction potential to be the copper sheathing that the torpescence metallic copper of 0.3402 V is made, and ensure that it is not particularly etched electrochemically in strand and varieties in saline-alkali areas under various environmental conditions.Copper sheathing outer surface does not need the anticorrosion of coating one deck pitch, and this just makes workshop environment not have the pollution of pitch, in the future when installing terminal and joint, pollutes site environment without pitch.In order to check the intact of flexible direct current cable jacket with DC break down voltage, the oversheath of cable extrudes conductive layer as test electrode, the environmental pollution preventing traditional cable to pass through to apply graphite linings to cause as test electrode.
embodiment 1
The present embodiment is rated voltage ± 320 kV flexible DC power transmission optical fiber compound extruded insulated power cables.
(1) water-blocking conductor 1, material is fine aluminium, and sectional area is 1400 mm
2, adopt stranded circular compact conductor structure or milliken conductor structure, material water-proof material is filled in conductor spacing;
(2) the how imperial twining package tape 2 of semiconductive spy, thickness 0.18 mm;
(3) semiconductive inner shield 3, thickness 1.5 mm;
(4) extruding insulating barrier 4 is the crosslinked material of ultra-clean PE adding space charge inhibitor, working temperature 90 DEG C, and dielectric constant is 2.3, and DC breakdown field intensity is greater than 45 kV/mm, thickness of insulating layer (22 ~ 24) mm; Ultra-clean PE is cross-linked material and is made by melting mixing method with the mixture of space charge inhibitor;
(5) semiconductive external shield 5, thickness 1.2 mm;
(6) first buffering water blocking layers 6, material is semi-conductive buffer water-blocking band, thickness (2 ~ 3) mm;
(7) stainless steel tube optical fiber 7, optical fiber radical is appropriate;
(8) second buffering water blocking layers 8, material is semi-conductive buffer water-blocking band, thickness (2 ~ 3) mm;
(9) corrugated metal cover 9, material is copper, and thickness is 0.8 mm;
(10) nonmetal oversheath 10, material is red PVC, thickness 5 mm;
(11) extrude conductive layer 11, thickness is about 0.6 mm;
(12) lettering 12, adopts white inkjet lettering or convex print.
embodiment 2
The present embodiment is rated voltage ± 200 kV flexible DC power transmission optical fiber compound extruded insulated power cables.
(1) water-blocking conductor 1, material is cable conductor dedicated aluminium alloy or copper, and sectional area is 1000 mm
2, adopt stranded circular compact conductor structure, material water-proof material is filled in conductor spacing;
(2) the how imperial twining package tape 2 of semiconductive spy, thickness 0.18 mm;
(3) semiconductive inner shield 3, thickness 1.5 mm;
(4) extruding insulating barrier 4 is the crosslinked material of ultra-clean PE adding space charge inhibitor, working temperature 90 DEG C, and dielectric constant is 2.3, and DC breakdown field intensity is greater than 45 kV/mm, thickness of insulating layer (12 ~ 14) mm; Ultra-clean PE is cross-linked material and is made by melting mixing method with the mixture of space charge inhibitor;
(5) semiconductive external shield 5, thickness 1 mm;
(6) first buffering water blocking layers 6, material is semi-conductive buffer water-blocking band, thickness (1.5 ~ 2.5) mm;
(7) stainless steel tube optical fiber 7, optical fiber radical is appropriate;
(8) second buffering water blocking layers 8, material is semi-conductive buffer water-blocking band, thickness (1.5 ~ 2.5) mm;
(9) corrugated metal cover 9, material is copper, and thickness is 0.7 mm;
(10) nonmetal oversheath 10, material is red PE, thickness 4.5 mm;
(11) extrude conductive layer 11, thickness is about 0.6 mm;
(12) lettering 12, adopts white inkjet lettering or convex print.
embodiment 3
The present embodiment is rated voltage ± 160 kV flexible DC power transmission optical fiber compound extruded insulated power cables.
(1) water-blocking conductor 1, material is copper, and sectional area is 500 mm
2, adopt stranded circular compact conductor structure, material water-proof material is filled in conductor spacing;
(2) semiconductive nylon twining package tape 2, thickness 0.1 mm;
(3) semiconductive inner shield 3, thickness (1.2 ~ 1.5) mm;
(4) extruding insulating barrier 4 is the crosslinked material of ultra-clean PE adding space charge inhibitor, working temperature 90 DEG C, and dielectric constant is 2.3, and DC breakdown field intensity is greater than 45 kV/mm, thickness of insulating layer (11 ~ 13) mm; Ultra-clean PE is cross-linked material and is made by melting mixing method with the mixture of space charge inhibitor;
(5) semiconductive external shield 5, thickness 1 mm;
(6) first buffering water blocking layers 6, material is semi-conductive buffer water-blocking band, thickness (1 ~ 2) mm;
(7) stainless steel tube optical fiber 7, optical fiber radical is appropriate;
(8) second buffering water blocking layers 8, material is semi-conductive buffer water-blocking band, thickness (1 ~ 2) mm;
(9) corrugated metal cover 9, material is copper, and thickness is 0.6 mm;
(10) nonmetal oversheath 10, material is fire-retardant PE, thickness 4 mm;
(11) extrude conductive layer 11, thickness is about 0.6 mm;
(12) lettering 12, adopts white inkjet lettering or convex print.
Claims (4)
1. high pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable, it is characterized in that, the center of this cable is water-blocking conductor, and described water-blocking conductor is coated with semiconductive twining package tape outward successively, extrudes internal shield, extrudes insulating barrier, extrudes outer shielding layer, the first buffering water blocking layer, the second buffering water blocking layer, metallic sheath, nonmetally extrude oversheath and extrude conductive layer; The optical fiber of stainless steel tube protection is also placed with between described first buffering water blocking layer and the second buffering water blocking layer; Described thickness of insulating layer of extruding is 10.6 ~ 30.0mm.
2. high pressure according to claim 1 and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable, is characterized in that, the thickness of described semiconductive twining package tape is 0.10 ~ 0.36mm; Described internal shield thickness of extruding is 1.0 ~ 2.0mm; Described outer shielding layer thickness of extruding is 0.6 ~ 1.5mm; The thickness of described first buffering water blocking layer, the second buffering water blocking layer is respectively 1 ~ 3mm; Described metallic sheath thickness is 0.5 ~ 3.8mm; Described nonmetal oversheath thickness of extruding is 4 ~ 6mm; Described conductive layer thickness of extruding is 0.4 ~ 1.2mm.
3. high pressure according to claim 1 and 2 and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable, it is characterized in that, described water-blocking conductor is made up of multiple conducting wires, be arranged in cylindric, in the gap of wire, be filled with material water-proof material, conductor material is fine aluminium or cable conductor dedicated aluminium alloy or copper; Described metallic sheath adopts wrinkle copper sheathing or stainless steel sleeve or aluminium cover; Described insulating barrier of extruding adopts through the mixture of ultra-clean the polyethylene base-material, crosslinking agent and the space charge inhibitor that processed, and working temperature reaches 90 DEG C; Described extrude internal shield and extrude outer shielding layer all use the crosslinked material of ultra-smooth semiconductive; Described nonmetal jacket material of extruding is PVC or PE.
4. high pressure according to claim 1 and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable, it is characterized in that, described optical fiber is multimode and/or single mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310094300.6A CN103123826B (en) | 2013-03-22 | 2013-03-22 | High pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable |
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| CN201310094300.6A CN103123826B (en) | 2013-03-22 | 2013-03-22 | High pressure and ultrahigh voltage flexible direct current transmission optical fiber compound extruded insulated power cable |
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| CN103123826A CN103123826A (en) | 2013-05-29 |
| CN103123826B true CN103123826B (en) | 2015-09-16 |
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| CA2999753C (en) * | 2015-09-28 | 2024-02-13 | Dow Global Technologies Llc | Peelable cable jacket having designed microstructures and methods for making peelable cable jackets having designed microstructures |
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| CN201975152U (en) * | 2011-03-22 | 2011-09-14 | 上海市电力公司 | High-voltage direct-current cable |
| CN102360615A (en) * | 2011-09-29 | 2012-02-22 | 宜昌联邦电缆有限公司 | High voltage and ultra-high voltage direct current (DC) cross-linked polyethylene insulated sea electric power cable |
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| CN203260362U (en) * | 2013-03-22 | 2013-10-30 | 国网电力科学研究院 | High-voltage and extra-high voltage flexible direct-current power transmission fiber composite extrusion insulation power cable |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH103823A (en) * | 1996-06-14 | 1998-01-06 | Fujikura Ltd | Direct current power cable insulated by cross-linked polyethylene |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2710113Y (en) * | 2004-04-14 | 2005-07-13 | 浙江晨光电缆有限公司 | 110KV and above cross-linked polyethylene insulated power cable with extruction conductive layer |
| CN201975152U (en) * | 2011-03-22 | 2011-09-14 | 上海市电力公司 | High-voltage direct-current cable |
| CN202221672U (en) * | 2011-08-03 | 2012-05-16 | 西安交通大学 | DC 110 kV cross-linked polyethylene insulation single-core overland cable |
| CN102360615A (en) * | 2011-09-29 | 2012-02-22 | 宜昌联邦电缆有限公司 | High voltage and ultra-high voltage direct current (DC) cross-linked polyethylene insulated sea electric power cable |
| CN202352382U (en) * | 2011-10-31 | 2012-07-25 | 无锡市沪安电线电缆有限公司 | High-voltage direct-current polymeric cable |
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Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Co-patentee after: NARI Group Corp. Patentee after: STATE GRID WUHAN HIGH VOLTAGE Research Institute Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Co-patentee before: NARI Group CORPORATION STATE GRID ELECTRIC POWER INSTITUTE Patentee before: STATE GRID WUHAN HIGH VOLTAGE Research Institute |
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