KR20150085447A - Power cable and manufacturing method of conductor of power cable - Google Patents
Power cable and manufacturing method of conductor of power cable Download PDFInfo
- Publication number
- KR20150085447A KR20150085447A KR1020140005325A KR20140005325A KR20150085447A KR 20150085447 A KR20150085447 A KR 20150085447A KR 1020140005325 A KR1020140005325 A KR 1020140005325A KR 20140005325 A KR20140005325 A KR 20140005325A KR 20150085447 A KR20150085447 A KR 20150085447A
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- KR
- South Korea
- Prior art keywords
- insulating film
- wire
- coated
- conductor
- stranded
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
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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
-
- 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
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
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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
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
Abstract
The present invention relates to a power cable and a method of making a conductor of the power cable. The power cable according to the present invention is a power cable comprising a flat conductor formed of a plurality of flat stranded stranded layers in which a flat stranded strand layer in which a center strand and a plurality of flat stranded strands are stranded in order on a central strand, an inner semi- conductor layer surrounding the outside of the flat- Wherein at least one of the rectangular parallelepiped strands constituting the rectangular conductor is formed by coating an insulating layer on the insulating layer, the insulating semiconducting layer surrounding the insulating semiconducting layer, and the outer semiconductive layer surrounding the insulating semiconducting layer, .
Description
The present invention relates to a method of manufacturing a conductor for a power cable and a power cable, and more particularly, to a method for manufacturing a conductor for a power cable and a power cable, And a method of manufacturing a conductor of a power cable.
The power cable has a tendency of increasing the diameter of a conductor provided inside the power cable so that a high voltage can be transmitted in response to an increase in power demand. In the past, in the case of a conductor in which a plurality of wires are connected together, a wire having a circular cross-sectional shape is mainly used as the conductor constituting the conductor. However, in the case of a conductor using such a circular wire, the spot rate is relatively low, and the area of the conductor for transmitting the actual power is lowered. In order to solve this problem, recently, a cable using a rectangular conductor having a square rectangular wire instead of a circular wire has been developed. The use of such a square wire allows the conductor to be increased to approximately 98% to 99% of the area, thereby increasing the area of the conductor that transmits power compared to the circular wire.
On the other hand, when AC (alternating current) is transmitted in the case of power transmission, a current flows along the surface of the conductor due to a skin effect, thereby limiting the transmission capacity. As the volume of the conductor increases, the power transmission amount does not increase and causes a loss. In order to reduce such AC loss, it has been attempted to use a so-called " stranded insulated conductor " in which insulated coated wires, which are round wires coated with an insulating film, are twisted (Korean Patent Laid-open Publication No. 10-2011-0024568). The use of such insulated coated wires reduces the AC resistance and reduces transmission losses, thereby increasing the transmission capacity relative to the same conductor cross-sectional area. As a method for coating an insulating film on such a circular wire, a method of coating a circular wire by passing it through an enamel solution is mainly used.
However, in the case of a quadrilateral rectangular parallelepipedal wire, when the insulating film is coated by passing the enamel solution, there is a problem that the angled corners are not coated properly. In the case where a part of the conductor wire is not coated, the insulating coating is not effective because it is electrically connected to the other wire through the uncoated portion. For this reason, a rectangular conductor made of an insulated coating wire is not currently used. Therefore, although the dot rate can be improved in the case of the rectangular conductor, in the case of AC transmission, the transmission capacity is limited by the surface effect.
Disclosure of Invention Technical Problem [8] In order to solve the above-described problems, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a power cable capable of improving the drop rate of a conductor of a power cable, And a manufacturing method thereof.
It is an object of the present invention to provide a semiconductor device comprising a flat conductor formed by a plurality of layers of flat stranded stranded layers each having a central strand and a plurality of flat stranded strands connected to each other on a central strand, An insulating layer surrounding the inner semiconductive layer, an outer semiconductive layer surrounding the insulating layer, And an outer sheath provided outside the outer semiconductive layer, wherein at least one of the square wire strands forming the flat conductor is coated with an insulating film.
Here, the flat rectangular wire coated with the insulating film is coated with an adhesive between the rectangular wire and the insulating film. The insulating film is coated by extrusion and may be made of nylon. On the other hand, the elementary wire coated with the insulating film and the elementary wire not coated with the insulating film can be twisted at a predetermined ratio.
In addition, any one elemental wire not coated with the insulating film is disposed so as not to be adjacent to another elementary wire not coated with the insulating film.
According to another aspect of the present invention, there is provided a method of manufacturing a conductor for a power cable, comprising the steps of: extruding a plurality of wires constituting the conductor into a rectangular shape; coating an insulating film on at least a part of the extruded wire; And a step of stranding the stranded wire coated with the insulating film and the stranded wire not coated with the insulating film.
The step of coating the insulating layer may include the steps of applying an adhesive to the surface of the elementary wire, heating the elementary wire to which the adhesive is applied to a predetermined temperature, passing the elementary wire coated with the adhesive through the insulating film extruder, And cooling the element wire to which the insulating film is adhered.
On the other hand, in the step of heating the wire coated with the adhesive, the wire is heated using a high frequency induction heater. The insulating layer may be formed of nylon.
Meanwhile, in the step of twisting the strands, the strands coated with the insulating layer and the strands not coated with the insulating layer may be stranded at a predetermined ratio. In this case, one of the elemental wires not coated with the insulating film is disposed so as not to be adjacent to another elementary wire not coated with the insulating film.
According to the present invention having the above-described configuration, it is possible to improve the drop rate of the power cable by producing a rectangular conductor by twisting a square wire element having a rectangular shape in comparison with a conventional circular wire element.
Further, in the case of fabricating the flat rectangular wire, the transmission loss due to the surface effect can be remarkably lowered when AC is transferred by coating at least a part of the rectangular wire with an insulating film. Particularly, a stranded wire coated with an insulating film and a stranded wire not coated with an insulating film are mixed and stranded at a predetermined ratio, thereby making it possible to prevent an increase in manufacturing cost and an increase in manufacturing time due to the coating cost of the stranded wire.
In addition, an insulating film composed of nylon is coated by extrusion after applying an adhesive to a square wire element, and the insulating film can be uniformly coated on the angled corners of the square wire.
1 is a perspective view illustrating an internal configuration of a power cable according to an embodiment,
Fig. 2 is a front view of Fig. 1,
3 is a front view showing a conductor according to another embodiment;
4 is a schematic view for explaining a surface effect,
5 is a flowchart illustrating a method of manufacturing a conductor of a power cable according to an embodiment of the present invention.
FIG. 6 is a schematic view schematically showing a process of extruding a rectangular wire,
7 is a cross-sectional view showing a state in which an adhesive is applied to the surface of a stranded wire,
8 is a schematic view schematically showing a step of adhering an insulating film to the surface of a wire wound with an adhesive,
9 is a front view showing a configuration of a conductor of a power cable according to an embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.
FIG. 1 is a perspective view showing an internal configuration of a
Referring to Figures 1 and 2, the
However, the surface of the
The inner
An
On the other hand, if not only the inside but also the outside of the insulating
A
A jacket (20) is provided on the outer side of the power cable (100). The
Meanwhile, the conductors of the
FIG. 3 shows a configuration of a
3, the
For example, as shown in Fig. 3, a circular
In the drawing, three rectangular parallelepiped stranded strands each formed by connecting a rectangular
On the other hand, in the case of transmitting power through an electric power cable, an AC (alternating current) transmission will reduce the area where electric power is actually transferred due to a skin effect. 4 is a schematic view for explaining the surface effect.
Referring to FIG. 4, when a current flows along the
For example, when a current is passed through one
In Equation (1), δ is the thickness of the skin through which a current can flow, f is frequency, μ is permeability in vacuum, and ρ is the resistivity of the conductor. This surface effect limits the amount of current flowing along the conductor, which significantly reduces its efficiency when transmitting and receiving power.
For example, when a conductor is constituted by a plurality of square-shaped
5 is a flowchart illustrating a method of manufacturing a conductor of a power cable according to an embodiment of the present invention.
Referring to FIG. 5, a method of manufacturing a conductor of a power cable includes the steps of (S100) extruding a plurality of wires constituting the conductor into a rectangular shape, a step (S130) of coating an insulating film on at least a part of the extruded wire, And a step (S150) of connecting the elementary wire coated with the insulating film and the elementary wire not coated with the insulating film.
That is, in this embodiment, when a rectangular wire is stranded to form a conductor, at least a part of the wire is coated with an insulating film. As described above, when a part of the strand is coated with an insulating film, the strand coated with the insulating layer may be electrically insulated from other strands to form a passage through which a current flows. Therefore, even if the surface effect is applied, the sectional area of the entire conductor is electrically divided by the elementary wire coated with the insulating film, and the surface effect is applied to each of the divided areas. The area where the current flows is relatively wider. Hereinafter, each step will be described in detail.
6 is a schematic view schematically showing a step of extruding a plurality of elemental wires into a rectangular shape.
Referring to FIG. 6, a
For example, in the 'C 1 ' region before passing through the plurality of extrusion rollers 320 and 340, the
After the
As shown in FIG. 5, the step of coating the insulating layer may include a step S132 of applying an adhesive to the surface of the
The
Referring to FIG. 7, since the insulating film is bonded to the surface of the
It is preferable to apply the adhesive 400 using a separate device capable of applying the adhesive rather than manually working the adhesive 400 along the surface of the
Subsequently, the wire to which the adhesive is applied is heated to a predetermined temperature (S134). This is to enable the insulating film to be more easily adhered in the step of activating the adhesive applied on the surface of the
After heating the element wire to a predetermined temperature, the
8, the insulating
After the insulating
As described above, since the insulating film is formed by extrusion after applying the adhesive to the stranded wire, there is an effect that the insulating film is well formed at the corner of the stranded wire.
After cooling the
For example, in order to reduce the loss due to the surface effect, all the wires constituting the conductor can be coated with an insulating film. However, if all the wires are coated with an insulating film, the coating cost and the coating time are increased, which increases the unit cost of the power cable. Therefore, in the present embodiment, not only all of the elemental wires are coated with the insulating film but also at least a part of the elemental wires constituting the conductor is coated with the insulating film.
However, when a part of the element wire is coated with an insulating film as described above, it is preferable to reduce the coating cost and the coating time, and to reduce the loss due to the surface effect. To this end, in this embodiment, as shown in FIG. 9, in the step of stranding the stranded wire, any one stranded wire not coated with the insulating film is disposed so as not to be adjacent to another stranded wire not coated with the insulated film.
Referring to FIG. 9, a
FIG. 9 shows a conductor in which a wire is stranded according to the above description. The conductor can of course be applied to the power cable according to Fig. That is, the
While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.
10, 600 .. Conductor
11, 210,
12. Internal semiconducting layer
14. Insulation layer
16 .. outer semiconductive layer
18. Neutral line
20. The sheath
400 .. Adhesive
500 .. Insulating Film Extruder
Claims (12)
An inner semiconductive layer surrounding the outside of the rectangular conductor;
An insulating layer surrounding the inner semiconductive layer;
An outer semiconductive layer surrounding the insulating layer; And an outer sheath provided outside the outer semiconductive layer,
Wherein at least one of the square wire strands forming the flat conductor is coated with an insulating film.
Wherein the flat rectangular wire coated with the insulating film has an adhesive applied between the rectangular wire and the insulating film.
Wherein the insulating film is coated by extrusion.
Wherein the insulating film is made of nylon.
And a stranded wire coated with the insulating film and a stranded wire not coated with an insulating film are stranded in a predetermined ratio.
Wherein one of the elemental wires not coated with the insulating film is disposed so as not to be adjacent to another elemental wire not coated with the insulating film.
Extruding a plurality of wires constituting the conductor into a rectangular shape;
Coating an insulating film on at least a part of the extruded wire; And
And stranding the stranded wire coated with the insulating film and the stranded wire not coated with the insulating film.
The step of coating the insulating film
Applying an adhesive to the surface of the stranded wire;
Heating the wire coated with the adhesive to a predetermined temperature;
Bonding the insulating film by passing the elementary wire coated with the adhesive through an insulating film extruder; And
And cooling the stranded wire to which the insulating film is adhered.
And heating the stranded wire using the high frequency induction heater in the step of heating the stranded wire to which the adhesive is applied.
Wherein the insulating film is made of nylon.
In the step of twisting the strands
And the stranded wire coated with the insulating film and the stranded wire not coated with the insulating film are stranded in a predetermined ratio.
Wherein one of the elemental wires not coated with the insulating film is disposed so as not to be adjacent to another elemental wire not coated with the insulating film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020140005325A KR20150085447A (en) | 2014-01-15 | 2014-01-15 | Power cable and manufacturing method of conductor of power cable |
Applications Claiming Priority (1)
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KR1020140005325A KR20150085447A (en) | 2014-01-15 | 2014-01-15 | Power cable and manufacturing method of conductor of power cable |
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KR20150085447A true KR20150085447A (en) | 2015-07-23 |
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KR1020140005325A KR20150085447A (en) | 2014-01-15 | 2014-01-15 | Power cable and manufacturing method of conductor of power cable |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105761808A (en) * | 2016-05-04 | 2016-07-13 | 上海斯麟特种设备工程有限公司 | Lightning protection cable |
CN110911035A (en) * | 2019-09-05 | 2020-03-24 | 广州岭南电缆股份有限公司 | Large-section special-shaped monofilament layer split conductor and manufacturing method thereof |
KR102625541B1 (en) * | 2023-08-24 | 2024-01-16 | 코앤전자산업 주식회사 | wire insulation process system |
-
2014
- 2014-01-15 KR KR1020140005325A patent/KR20150085447A/en not_active Application Discontinuation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105761808A (en) * | 2016-05-04 | 2016-07-13 | 上海斯麟特种设备工程有限公司 | Lightning protection cable |
CN105761808B (en) * | 2016-05-04 | 2017-04-19 | 上海斯麟特种设备工程有限公司 | Lightning protection cable |
CN110911035A (en) * | 2019-09-05 | 2020-03-24 | 广州岭南电缆股份有限公司 | Large-section special-shaped monofilament layer split conductor and manufacturing method thereof |
KR102625541B1 (en) * | 2023-08-24 | 2024-01-16 | 코앤전자산업 주식회사 | wire insulation process system |
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