KR20130008878A - Electric power cable for wind turbine - Google Patents
Electric power cable for wind turbine Download PDFInfo
- Publication number
- KR20130008878A KR20130008878A KR1020110069541A KR20110069541A KR20130008878A KR 20130008878 A KR20130008878 A KR 20130008878A KR 1020110069541 A KR1020110069541 A KR 1020110069541A KR 20110069541 A KR20110069541 A KR 20110069541A KR 20130008878 A KR20130008878 A KR 20130008878A
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- layer
- power
- metal shielding
- shielding layer
- power cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/303—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/307—Other macromolecular compounds
-
- 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
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0225—Three or more layers
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- 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
- H01B7/02—Disposition of insulation
- H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
- H01B7/025—Disposition of insulation comprising one or more helical wrapped layers of insulation comprising in addition one or more other layers of non-helical wrapped insulation
-
- 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
- H01B7/20—Metal tubes, e.g. lead sheaths
- H01B7/207—Metal tubes, e.g. lead sheaths composed of iron or steel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Insulated Conductors (AREA)
Abstract
The present invention discloses a power cable for a wind generator. The power cable according to the present invention comprises: an inner semiconducting layer that surrounds a center conductor and an outer circumference of the center conductor in order, at least one power line consisting of an insulating layer and an outer semiconducting layer and extending in a longitudinal direction; A metal shielding layer surrounding an outer circumference of each power line to shield or ground unstable power generated from the power lines; And an inner and outer sheath layer surrounding the at least one power line, wherein the metal shielding layer is made of element wires of element wire diameters, and the element wires are formed by wiping in a single direction.
Description
The present invention relates to a power cable, and more particularly to a power cable for a wind generator for transmitting power generated from the wind generator.
Recently, as the depletion of fossil energy resources such as oil and coal is accelerated, interest in alternative energy that can replace them is increasing. Among them, wind power generation converts the kinetic energy of the wind into electrical energy, and has no problems with resource depletion or environmental pollution. Accordingly, the power generation capacity of the wind generator is also increasing in size from 1,000KW to 2,000KW.
The wind power generator is provided with a windmill, a power generation unit equipped with a rotational force transmission mechanism, a generator, and the like on the top of the tower to be rotatable about the tower. In this power generation unit, a power cable for power transmission is installed. As the power generation unit rotates left and right, the cable is twisted at a large angle. Generally the torsion angle reaches up to ± 540 degrees.
In addition, in the case of power cables applied to wind power generators of 1MW or more, a high voltage of 15 kV or more is added, so that a semi-conductive or conductive metal shielding layer is inevitably applied inside and outside of the insulator to prevent high voltage discharge and breakdown voltage of the cable insulator. Will be.
Figure 1 shows a cross-sectional structure of such a power cable for a wind generator. Referring to FIG. 1, a conventional wind generator power cable includes one or
The
The conventional wind generator power cable is subjected to repeated torsional behavior inside the cable due to the continuous rotational movement of the nacelle portion in which the tower upper generator is positioned according to the wind generator operating environment after installation in the tower of the wind generator. Such torsional behavior may cause mechanical breakage due to friction, bending, torsion, etc. between power lines in the cable.
For this reason, power cables for wind generators should be manufactured with sufficient flexibility and durability to meet the external tension load and torsion environment, and the
However, in the case of the
The present invention has been made to solve the problems of the prior art as described above, by improving the structure of the metal shielding layer of the outer portion of the power line included in the power cable, satisfies the mechanical and electrical properties and improve the flexibility for high pressure It is an object of the present invention to provide a power cable for a wind generator with improved long-term durability by shielding or grounding power and maintaining excellent torsional and bending durability.
According to an aspect of the present invention, there is provided a power cable, including at least one of an inner semiconducting layer surrounding an outer circumference of a center conductor and the center conductor, an insulating layer, and an outer semiconducting layer and extending in a longitudinal direction. More power lines; A metal shielding layer surrounding an outer circumference of each power line to shield or ground unstable power generated from the power lines; And an inner and outer sheath layer surrounding the at least one power line, wherein the metal shielding layer is made of element wires of element wire diameters, and the element wires are formed by wiping in a single direction.
Preferably, the metal shielding layer is formed by wiping a ray angle, which is an angle of the element wire to the longitudinal direction of the power line, to satisfy 60 ° to 70 °.
Preferably, the metal shielding layer has a diameter of 0.1 mm to 0.7 mm.
Preferably, the metal shielding layer has an elongation of at least 15% of the element wire.
Preferably, the metal shielding layer has a tensile strength of 20 kgf / mm 2 or more.
According to the present invention, by improving the structure of the metal shielding layer on the outer portion of the power line included in the power cable, it satisfies the mechanical and electrical properties and improves the flexibility to allow the shielding or grounding of the high-voltage power, while providing excellent torsional and bending durability It is possible to provide a power cable with improved long-term durability. In addition, when installing a power cable with a metal shielding layer with improved torsional and bending durability in a tower of a wind generator, it can act as a return of fault current due to a ground fault or a short circuit accident in the environment of use. It is effective to prevent accidents by preventing them.
BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, And shall not be interpreted.
1 is a cross-sectional view showing the configuration of a power cable for a conventional wind generator.
2 is a cross-sectional view showing the configuration of a power cable for a wind generator according to the present invention.
3 is a diagram illustrating a configuration of the power line of FIG. 2.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.
2 is a cross-sectional view showing the configuration of a power cable for a wind generator according to the present invention, Figure 3 is a view showing the configuration of the power line of FIG.
Referring to FIG. 2, the power cable for a wind generator according to the present invention includes at least one
The
The
The
The
The
The
Meanwhile, the inner
The
In the present invention, the conventional metal shielding layer is a braided braided form or a metal tape form is made of the element wire of the wire diameter and is formed by wiping in a single direction to improve the
As shown in FIG. 3, the
The
The
In the
The power cable employing the
The inner and outer sheath layers 200 and 400 are layers that surround and protect the
Hereinafter, the present invention will be described in more detail with reference to preferred embodiments of the present invention and comparative examples in order to help the understanding of the present invention. However, the embodiments are only illustrative of the present invention, and the scope of the present invention is not limited thereto.
Torsional Strength Test According to Metal Shield Layer Structure Example 1 , Comparative Example 1 )
A power cable specimen (Example 1) according to the present invention and a conventional power cable siphon (Comparative Example 1) were prepared.
Example 1 according to a preferred embodiment of the present invention by twisting the tin-plated copper with a diameter of 0.4mm to produce a center conductor of 35SQ standard, the inner semiconducting layer of EVA series, the insulating layer of EPR material on the outer circumference of the center conductor , The outer semiconducting layer of the same material as the inner semiconducting layer was sequentially extruded, and the outer circumference of the copper with 0.45 mm in diameter, 20% elongation and 20 kgf / mm in tensile strength so that the ray angle is 60 ° To form a metal shielding layer to prepare a power line. The three power lines were fabricated and extruded EVA inner and outer sheath layers to produce power cable specimens.
In Comparative Example 1, a 35SQ standard center conductor was manufactured by twisting tin-plated copper having a diameter of 0.4 mm, and the outer periphery of the center conductor was the same as that of the EVA-based inner semiconducting layer, the EPR insulating layer, and the inner semiconducting layer. The outer semiconducting layer of the material was sequentially extruded, and a power shield was manufactured by forming a metal shielding layer made of a copper material having a diameter of 0.18 mm and a braiding type on the outer circumference thereof. The three power lines were fabricated and extruded EVA inner and outer sheath layers to produce power cable specimens.
Each specimen was installed in an MTS axial torsional tester, and repeated 5000 times at 108 degrees / m and then observed whether or not the specimen was broken.
As a result, in Example 1, there were no cracks or breakages in the inner semiconducting layer, the insulating layer, and the outer semiconducting layer in the power line, and no damage was caused to the metal shielding layer and the center conductor so that the breakage rate was 0%. On the other hand, in Comparative Example 1, there were no cracks or breakages in the inner semiconducting layer, the insulating layer, and the outer semiconducting layer inside the power line, and no damage occurred in the center conductor, but overall breakage occurred in the metal shielding layer. Therefore, it can be seen that the power cable of Example 1 exhibits high durability against repeated torsional deformation compared to Comparative Example 1.
Metal shielding layer Lay Torsional strength test according to angle Example 2 , Comparative Example 2 4)
A power cable specimen (Example 2) and a power cable specimen (Comparative Examples 1 to 4) according to the present invention were prepared.
Example 2 according to a preferred embodiment of the present invention by twisting the tin-plated copper with a diameter of 0.4mm to produce a center conductor of 35SQ standard, the inner semiconducting layer of EVA series, the insulating layer of EPR material on the outer circumference of the center conductor , The outer semiconducting layer of the same material as the inner semiconducting layer was sequentially extruded, and the outer circumference of the copper was 0.45 mm in diameter, 20% elongation, and 20 kgf / mm2 tensile strength of copper so that the ray angle was 69.5 °. To form a metal shielding layer to prepare a power line. The three power lines were fabricated and extruded EVA inner and outer sheath layers to produce power cable specimens. Also, in Comparative Examples 2 to 4, the ray angle of the metal shielding layer was changed and the remaining elements except for the same were manufactured in the same manner.
Each specimen was installed in an MTS axial torsional tester, repeated 5000 times at 180 degree / m, and the number of break strands of each wire forming the metal shield layer of the specimen was measured, and the results are shown in Table 1 below. . At this time, the breakage result was expressed as the breakage rate (%) obtained by dividing the number of break strands by the total number of bases.
As can be seen from Table 1, in Comparative Examples 2 to 4 having a ray angle of 60 ° or less, breakage occurred in the element wires forming the metal shielding layer. In particular, the breakage rate increased as the ray angle became smaller and then 40 °. It showed the maximum breakage rate in the vicinity and tended to decrease again. However, it was confirmed experimentally that breakage still occurred. In addition, when larger than 70 °, the wires burned to each other, resulting in uneven shielding. On the other hand, in Example 2, when the ray angle was 69.5 °, no breakage occurred in the element wire forming the metal shielding layer. Accordingly, it can be seen that the power cable of Example 2, which has a lay angle of 69.5 degrees, exhibits high durability against repeated torsional deformation, as compared to Comparative Examples 2 to 4 having a lay angle of 60 degrees or less.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.
100: power line 110: center conductor
120: inner semiconducting layer 130: insulating layer
140: outer semiconducting layer 150: metal shielding layer
200: inner sheath layer 300: binding tape
400: outer sheath layer
Claims (5)
A metal shielding layer surrounding an outer circumference of each power line to shield or ground unstable power generated from the power lines; And
An inner and outer sheath layer surrounding the at least one power line,
The metal shielding layer is made of a wire of the element diameter, the power cable, characterized in that the wire is formed by wiping in a single direction.
The metal shielding layer is a power cable, characterized in that formed by wiping so that the lay angle (Lay Angle) that is the angle that the element wires and the longitudinal direction of the power line satisfies 60 ° ~ 70 °.
The metal shielding layer is a power cable, characterized in that the diameter of the element wire is 0.1mm to 0.7mm.
The metal shielding layer, the power cable is characterized in that the elongation of the wire is 15% or more.
The metal shielding layer has a tensile strength of 20 kgf / mm 2 or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020110069541A KR20130008878A (en) | 2011-07-13 | 2011-07-13 | Electric power cable for wind turbine |
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KR1020110069541A KR20130008878A (en) | 2011-07-13 | 2011-07-13 | Electric power cable for wind turbine |
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KR1020110069541A KR20130008878A (en) | 2011-07-13 | 2011-07-13 | Electric power cable for wind turbine |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103915208A (en) * | 2014-03-14 | 2014-07-09 | 安徽华海特种电缆集团有限公司 | Cable for wind power generation |
CN103971846A (en) * | 2014-05-26 | 2014-08-06 | 龚永祥 | High-voltage cable |
CN103985471A (en) * | 2014-04-11 | 2014-08-13 | 西北工业大学 | Cable connecting airplane electric brake controller and electromechanical actuator |
CN105895221A (en) * | 2016-05-18 | 2016-08-24 | 安徽国华电缆集团有限公司 | Silvered steel tape shielded power cable |
-
2011
- 2011-07-13 KR KR1020110069541A patent/KR20130008878A/en active Search and Examination
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103915208A (en) * | 2014-03-14 | 2014-07-09 | 安徽华海特种电缆集团有限公司 | Cable for wind power generation |
CN103985471A (en) * | 2014-04-11 | 2014-08-13 | 西北工业大学 | Cable connecting airplane electric brake controller and electromechanical actuator |
CN103985471B (en) * | 2014-04-11 | 2016-04-20 | 西北工业大学 | A kind of Electric Brake System of Aircraft controller and electromechanical actuator stube cable |
CN103971846A (en) * | 2014-05-26 | 2014-08-06 | 龚永祥 | High-voltage cable |
CN103971846B (en) * | 2014-05-26 | 2016-04-13 | 国网山东省电力公司菏泽供电公司 | A kind of high-tension cable |
CN105895221A (en) * | 2016-05-18 | 2016-08-24 | 安徽国华电缆集团有限公司 | Silvered steel tape shielded power cable |
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