KR101658049B1 - Overhead electric cable and method of fabricating the same - Google Patents

Abstract

The present invention provides a method of manufacturing a composite casting apparatus, comprising: preparing a composite casting apparatus provided with a molten aluminum or molten aluminum alloy; Forming a preliminary aluminum composite material in which the aluminum fiber or the aluminum alloy is coated on the outer circumferential surface of the carbon fiber core in the course of transporting the carbon fiber core through the aluminum melt or the aluminum alloy melt; Wherein the preliminary aluminum composite material is pressed through a die formed at an outlet of the composite casting apparatus to form an aluminum composite material; And a plurality of the aluminum composite members are twisted in a wire shape to form an aluminum composite core. A method of manufacturing a transmission power transmission line and a method of manufacturing the transmission power transmission line, And a conductor portion surrounding the center tension line.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead electric cable,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line and a method of manufacturing the same. More particularly, the present invention relates to a transmission line with high strength, low rigidity and low loss, and a method of manufacturing the same.

Transmission line is a working line used to send electricity generated from water / thermal power or nuclear power plant to a substation in suburban suburbs. It is made by reinforcing tensile strength with aluminum wire as conductor and steel wire or carbon composite as center. (ACSR / AW) with high corrosion resistance, aluminum coated stranded aluminum stranded wire (ACSR / AW), heat resistant superalloy aluminum alloy strand (TACSR) with increased current capacity and INVAR steel wire with small linear expansion coefficient. (STACIR), which is an ultra-heat-resistant base aluminum alloy wire (STACIR), which can prevent the increase of electric power consumption and paper stock.

Galvanically coated steel is the most representative core material of ACSR transmission line as the center core material of machined wire. Invar steel, high strength and low conductivity aluminum alloy due to high tensile strength and low thermal expansion coefficient increase strength Is used as the core material for the aluminum-coated carbon fiber core aluminum conductor (AAAC, Aluminum Carbon Fiber Composite Covered Al Alloys).

Recently, in 3M, aluminum core composite core reinforcing cable (ACCR, Aluminum Conductor Composite Core Reinforced cable) is used as a core material of a transmission line. However, due to heat generated during AC transmission, a difference in thermal expansion coefficient CTC of the United States reports the advantages of 63% IACS high conductivity, high strength, low thermal expansion coefficient and low ductility using carbon fiber composite material as the core of ACCC transmission line. However, The price is more than five times higher than that, and the flexibility is difficult to install, and there is a problem that a special fixture is necessary for connection between the wires.

Korean Patent No. 10-0699221 (Mar. 19, 2007)

It is an object of the present invention to provide a machined transmission line and a method of manufacturing the same, in which the cost is low and the flexibility is excellent, so that a separate jig is not required. However, these problems are illustrative and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a method of manufacturing a machined transmission line, comprising: preparing a composite casting apparatus provided with an aluminum melt or an aluminum alloy melt; Forming a preliminary aluminum composite material in which the aluminum fiber or the aluminum alloy is coated on the outer circumferential surface of the carbon fiber core in the course of transporting the carbon fiber core through the aluminum melt or the aluminum alloy melt; Wherein the preliminary aluminum composite material is pressed through a die formed at an outlet of the composite casting apparatus to form an aluminum composite material; And a plurality of the aluminum composite materials are stranded in a wire shape to form an aluminum composite core.

The casting space of the composite casting apparatus may be preheated by the heater unit before the molten aluminum or aluminum alloy is injected into the composite casting apparatus.

The heater unit is divided into multi-sectors, so that the regions divided by the multi-sectors can be controlled independently at a predetermined temperature.

And surrounding the outer circumferential surface of the formed aluminum composite material core with the conductor portion.

The aluminum composite material is squeezed according to the shape of the die formed at the outlet of the composite casting apparatus and the shape of the cross section or the thickness of the transverse section of the aluminum composite material is deformed so that the interface of the aluminum composite material or the outer aluminum layer is densely Packed, and may be free of porosity.

The step of forming the aluminum composite material may include continuously supplying the carbon fiber shim to the composite casting apparatus by using a coil to coil method so that the aluminum composite material coated with the aluminum or aluminum alloy on the outer circumferential surface of the carbon fiber shim To form the second electrode.

According to another aspect of the present invention, the working transmission line may include a center tensile line having the aluminum composite core embodied in the method of manufacturing the above-mentioned working transmission line, and the conductor portion surrounding the center tensile line.

The center tensile line may be packed with the carbon fiber core aluminum composite material coated with a plurality of the aluminum or aluminum alloy, and the center tensile line may be disposed such that the carbon fiber core is spaced apart from the aluminum or aluminum alloy base And the cross-section of the aluminum composite core may be polygonal.

The conductor portion may be arranged such that a plurality of aluminum strands are packed, and the cross section of the aluminum strands may be polygonal.

According to one embodiment of the present invention as described above, since the carbon fiber core is coated with a metal that can be easily subjected to plastic working, the physical properties of the aluminum working transmission line are improved, so that the tensile strength is high and the flexibility of the aluminum working transmission line is improved. The installation of the transmission line is easy and the safety of the operator can be secured.

In addition, an inexpensive low-cost, low-loss aluminum machined transmission line and a manufacturing method thereof can be realized. Of course, the scope of the present invention is not limited by these effects.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process flow chart schematically showing a method of manufacturing a machined transmission line according to an embodiment of the present invention. FIG.
2 is a schematic view of a composite casting apparatus for manufacturing a processed transmission line according to an embodiment of the present invention.
3A to 3D are schematic views of a cross section of a transmission line according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size.

Fig. 1 is a process flow chart schematically showing a method of manufacturing a machined transmission line according to an embodiment of the present invention, and Figs. 2A and 2B schematically show an apparatus for manufacturing a machined transmission line according to an embodiment of the present invention FIG.

Referring to FIG. 1, a method of manufacturing a machined transmission line according to an embodiment of the present invention includes the steps of preparing a composite casting apparatus equipped with an aluminum melt or an aluminum alloy melt (S100) (S300) of forming a preliminary aluminum composite material in which aluminum or an aluminum alloy is solidified on the outer circumferential surface of the carbon fiber core in the process of transferring the carbon fiber core through the aluminum melt or the aluminum alloy melt (S300) A step S400 of forming an aluminum composite material by extrusion or drawing while passing through a die formed at an outlet of the casting apparatus, and a step S500 of forming an aluminum composite material core by stranding a plurality of aluminum composite materials in a wire shape.

A method of manufacturing the above-mentioned working transmission line will be described later with reference to Fig.

In order to improve the physical properties of the transmission line, polymer composite materials made of thermosetting resin and high strength fiber have been used as substitutes for steel wires or steel wires used as center tensile wires. However, the processed transmission line is connected to the steel tower by pressing the center tensile wire to the clamp. When pressed to the clamp of the center tensile wire made of conventional steel or steel wire, the mechanical transmission is accompanied by the mechanical connection, There is a problem that the deformation does not occur and the bonding force with the clamp is deteriorated. This problem is caused by the problem that the installed transmission line is pulled out of the clamp due to the external environment such as tension or wind, which may cause a serious problem on the structural stability of the transmission line.

In order to solve this problem, in the present invention, the center tension line of the processed transmission line is made of a high strength carbon fiber padding 22 having a light weight and excellent mechanical properties, and a metal covering layer is formed on the outer peripheral surface of the carbon fiber padding 22, The mechanical deformation can be increased, and thereby the bonding force can be improved when the clamp is engaged with the clamp.

2 is a schematic view of a composite casting apparatus according to an embodiment of the present invention.

For example, as shown in Fig. 2, the composite casting apparatus 1 may include a first opening portion 13a and a second opening portion 13b. The carbon fiber padding 22 constituting the main axis of the center tension line may be inserted into the first opening 13a. The carbon fiber padding 22 may be a single wire or a bundle of multiple strands of carbon fiber padding 22 may be used. The plurality of strands 22 may be composed of, for example, 1024 or 2048 fibers. The carbon fiber padding 22 may be heated and compressed, or the carbon fiber padding 22 may be weaving.

The molten metal can be injected into the second opening 13b. The molten metal may include, for example, aluminum or an aluminum alloy 24, and other metal materials such as copper having high electrical conductivity may be applicable.

On the other hand, the mold 10 constituting the composite casting apparatus 1 may include the heater unit 12. [ The heater unit 12 may include a heater capable of heating the molten metal to be injected into the casting space 16 in the mold 10. For example, a heater can use a sheath heater. The sheath heater is made by inserting a heating element into a metal protection tube in the shape of a coil, then filling it with insulating powder and electrically insulated. Both ends of the sheathed heater have power supply terminals. The sheath heater has a good thermal efficiency and can be very economical. In addition, it is excellent in mechanical strength such as vibration and impact, and can be easily processed in various forms depending on the place where it is to be installed, which is advantageous in that it is easy to install. Various devices capable of heating the casting space other than the sheath heater are applicable.

The casting space 16 of the composite casting apparatus 1 may be preheated by the heater unit 12 before the molten metal is injected into the casting apparatus 1. [ The carbon fiber core 22 and the melted aluminum or aluminum alloy 24 are introduced into the casting space 1 of the composite casting apparatus 1 through the first opening 13a and the second opening 13b of the preheated composite casting apparatus 1, (16). The heater unit 12 may be divided into multi-sectors. The multi-sector may be roughly divided into a region heated to a temperature higher than a melting point of the molten metal and a region heated to a temperature close to a melting point of the molten metal. Independently heating the regions divided by the multisect can be applied to preheat the composite casting apparatus 1 or to heat the molten metal injected into the casting space 16 of the composite casting apparatus 1 .

The order in which the materials are inserted and the distinction of the heater section 12 may vary depending on aspects of the efficient manufacturing process of the processing power transmission line. For example, T1, T2, and T3 can be distinguished as shown by dotted lines in FIG. The composite casting apparatus 1 may be designed to be controlled at a predetermined temperature for each of the divided regions. First, in the case of T1, it is possible to control the T1 region by about 50 ° C higher than the melting point of the aluminum or aluminum alloy 24 in the region where only the molten aluminum or aluminum alloy 24 is present.

In addition, the height of the molten metal injected into the casting space 16 through the second opening 13b of the multi-casting apparatus 1 is injected as high as h to prevent contamination by slag. This is because when the ore or metal is melted in a furnace or a cupola, solvents, non-metallic materials, and metal oxides are left on the surface of the molten metal as floating or scum. It is possible to control the T2 region such that the aluminum or aluminum alloy 24 reacting to the outer circumferential surface of the carbon fiber padding 22 is not affected by such impurities.

T2 is a region where the carbon fiber padding 22 and the melted aluminum or aluminum alloy 24 are reacted and can be controlled to be about 100 ° C to 150 ° C higher than the melting point of the aluminum or aluminum alloy 24 have. The carbon fiber padding 22 is heated to a temperature higher than the melting point so that the carbon fiber padding 22 is transferred onto the outer circumferential surface of the carbon fiber padding 22 through the aluminum melt or the aluminum alloy melt injected into the casting space 16, The preliminary aluminum composite material 20a coated with the preliminary aluminum composite material 24 may be formed.

Finally, in the case of T3, the region for controlling the T3 region at a temperature lower than T2 can be heated to a temperature range close to the melting point of the aluminum or aluminum alloy 24. The preliminary aluminum composite material 20a is pressed by the die 14 of the composite casting apparatus 1 so that the interface of the preliminary aluminum composite material or the outer aluminum layer is densely packed so that the pores- .

A predetermined pressure can be applied to the preliminary aluminum composite material 20a formed in the casting space 16. [ The preliminary aluminum composite material 20a subjected to the pressure is extruded or drawn out through the die 14 formed at the outlet of the composite casting apparatus 1 and is smaller in cross sectional area than the preliminary aluminum composite material 20a before passing through the die 14 , Aluminum or an aluminum alloy is pressed to the outside of the carbon fiber padding 22 at a high density to form an aluminum composite material 20 having no pores.

The composite casting apparatus 1 comprises an aluminum composite material 20 which is extruded or drawn out according to the shape of the die 14 formed at the outlet of the composite casting apparatus 1 which is produced by extruding or drawing the aluminum composite material 20 in the longitudinal direction The shape of the cross section or the thickness of the cross section can be deformed. The shape and the thickness of the aluminum composite material 20 can be designed and modified in accordance with the weight and current capacity of the processing power transmission line. When the aluminum composite material 20 is manufactured by using the composite casting apparatus 1, a separate preheating device is not required, and the deformation resistance of the aluminum composite material is lowered at a high temperature, so that productivity is improved due to cost reduction and simplification of the process .

The carbon fiber padding 22 is continuously supplied to the composite casting apparatus 1 by using a coil to coil method so that an aluminum or aluminum alloy 24 is formed on the outer peripheral surface of the carbon fiber padding 22. [ The coated aluminum composite material 20 may be formed in only one step. For example, at least two roll structures (not shown) may be formed outside the composite casting apparatus 1. At least one roll structure of the plurality of roll structures may be located on the first opening 13a of the composite casting apparatus 1. [ This roll structure is continuously loosened from the core roll 22 of the carbon fiber padding 22 as a thread is loosened by mounting a core of the carbon fiber padding 22 inserted through the first opening 13a, (16). The other roll structure may be positioned on the exit of the composite casting apparatus 1 and may wind the aluminum composite material 20 formed through the extrusion or drawing process of the composite casting apparatus 1.

The roll structure is disposed on both sides of the composite casting apparatus 1 so that the supply of the carbon fiber padding 22 and the supply and reception of the aluminum composite material 20 are performed in only one step in the aluminum composite material 20 The production can be carried out continuously. In addition, the roll structure can be arranged in an even number, and the supply of the carbon fiber padding 22 and the supply and the supply of the aluminum composite material 20 can be continuously and repeatedly performed by utilizing the extra rolls as a pile.

The aluminum composite material 20 may be used alone. However, in order to increase the durability and current capacity of the working transmission line, a plurality of aluminum composite materials 20 may be twisted in a wire shape to form an aluminum composite material core.

The twisted aluminum composite material core may further include a conductor portion surrounding the aluminum composite material core. The conductor portion serving as a power transmission can use a metal material having excellent electrical conductivity such as aluminum or copper. Here, the specific structure of the conductor portion and the technique of forming the conductor portion are already well known, and a detailed description thereof will be omitted.

The aluminum composite material 20 produced in the composite casting apparatus 1 of FIG. 2 is subjected to a step of twisting in the form of a twisted wire in order to serve as a center tension line of the transmission line in the next step. A plurality of the aluminum composite materials 20 can be prepared. A plurality of prepared aluminum composites 20 may be gathered together to form twisted wires. The plurality of aluminum composite materials 20 gathered may be twisted in a twisted line shape by rotating them in a predetermined direction to form the aluminum composite core. The aluminum composite core thus formed is strong in strength and can be easily processed because of its flexibility. At this time, the formed aluminum composite material core is subjected to an extrusion process to pressurize the aluminum composite material core, so that the aluminum or aluminum alloy surrounding the carbon fiber shim can be formed as a single aluminum or aluminum alloy (24) base. A plurality of carbon fiber padding 22 may be disposed apart from each other within the aluminum or aluminum alloy 24 matrix. A detailed description thereof will be described later with reference to Figs. 3A to 3D.

The conductor portion may be formed outside the center tensile line including the formed aluminum composite material core. The conductor portion may be packed with a plurality of aluminum strands. The conductor portion can be twisted in a twisted line like a center tension line. Depending on the current carrying capacity of the working transmission line to be used, the aluminum strands may be packed in multiple layers and formed thick.

3A to 3D are schematic views of a cross section of a transmission line according to an embodiment of the present invention.

3a and 3b show an embodiment in which the aluminum composite core 20b used as the center tensile line 21 and the conductor section 30 surrounding the center tensile line 21 are formed in a circular shape.

The manufacturing method of the aluminum composite material core 20b used as the center tension line 21 is the same as the method described above with reference to Figs. However, the shape of the die 14 formed at the outlet of the composite casting apparatus 1 shown in Fig. 2 is formed in a circular shape, so that the aluminum composite material (Fig. The aluminum composite material 20 may have a structure in which aluminum or an aluminum alloy 24 surrounds the outer circumferential surface of the carbon fiber shim 22.

The plurality of aluminum composite members 20 pass through the twisting device (not shown), so that the outside of the joist line 21, which is the center where the aluminum composite core 20b is formed, can be surrounded by the conductor 30. The conductor unit 30 serves as a power transmission function and can use aluminum strands, and its cross section can be formed in a polygonal shape. The polygon may include at least one of, for example, a trapezoid, a pentagon, a hexagon, or a circle.

3B shows that the transverse section of the center tension line 21 is formed in the same shape as the transverse section of the aluminum composite 20 shown in FIG. 3A, but a plurality of carbon fiber shims 22 are formed in the base of the aluminum or aluminum alloy 24 They may be arranged regularly or irregularly with one another. This is because when the aluminum composite material 20 produced by the composite casting apparatus 1 shown in FIG. 2 is passed through a twisting device (not shown) to form the aluminum composite material core 20b, the twisted aluminum composite material core 20b The aluminum or aluminum alloy 24 surrounded by the outer circumferential surface of the carbon fiber core may be changed to a single aluminum or aluminum alloy 24 base due to the pressure that is exerted by the extrusion process. At this time, a plurality of carbon fiber padding 22 constituting the aluminum composite material 20 may be moved in the base of the aluminum or aluminum alloy 24 so as to be regularly or irregularly spaced from one another.

Figures 3c and 3d show the aluminum composite core 20b used as the center tensile line 21 and the conductor section 30 surrounding the center tensile line 21 in a polygonal cross section, , A trapezoid, a pentagon, a hexagon, or a circle. The manufacturing method of the aluminum composite material core 20b used as the center tension line 21 is the same as the method described above with reference to Figs. However, as shown in FIGS. 3A and 3B, the die 14 is formed at the exit of the composite casting apparatus 1, so that the cross-sectional surface of the aluminum composite material 20 can have various shapes by the die.

When a plurality of trapezoidal aluminum composite materials 20 formed in this manner are used to form the aluminum composite core 20b using a twisting device (not shown), the carbon fiber core 20b coated with aluminum or aluminum alloy 24, (22) can be packed well.

3C, while the aluminum composite material 20 shown in Fig. 3C passes through a twisting device (not shown), as shown in Fig. 3B, the aluminum composite material 20 manufactured by the composite casting device 1 shown in Fig. The aluminum composite core 20b is subjected to the extrusion process while the aluminum composite core 20b is formed while passing through a twisting device (not shown) The aluminum or aluminum alloy 24 surrounded by the outer circumferential surface can be changed to a single aluminum or aluminum alloy 24 base. At this time, a plurality of carbon fiber padding 22 constituting the aluminum composite material 20 may be moved in the base of the aluminum or aluminum alloy 24 so as to be regularly or irregularly spaced from one another.

Assuming that the size of the machined transmission line 40 is the same, FIGS. 3A and 3B and FIGS. 3C and 3D are compared as follows. The packing can be made more favorably without voids than the working power transmission line 40 in the case where the cross section of each component is polygonal and the working power transmission line 40 is circular in cross section of each component, And it is possible to manufacture a high-strength, low-loss processed power transmission line 40. [

However, FIGS. 3A to 3D correspond to various embodiments of the method of manufacturing transmission line 40 according to the present invention, and can be designed and modified in different forms according to the required amount of power and manufacturing cost of the transmission line 40 .

As described above, in order to commercialize an aluminum processed transmission line including a high-strength, low-loss and low-loss aluminum-coated carbon fiber core of 345 kV class, which maintains a high conductivity of 63% IACS even at a high temperature of about 250 ° C as described above, It is possible to develop a new concept of aluminum-coated carbon fiber core composite core having a high strength and a low linear expansion coefficient even at a high temperature and a process technology for economically manufacturing a high-power aluminum processing transmission line.

Further, since the outer circumferential surface of the carbon fiber core is covered with aluminum or an aluminum alloy which is easy to be subjected to plastic working, it is possible to wind the machining power transmission line or transfer it easily, and to secure the safety of the worker installing the machining power transmission line.

Therefore, by combining these materials with core and processing transmission line materials and mass-producing them into high-strength and ultra-high-temperature aluminum composite stranded wires, it is possible to cope with the emerging domestic market of emerging large-capacity transmission lines and secure a bridgehead to advance into overseas markets .

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: Composite casting apparatus 10: Mold
12: heater part 13a: first opening
13b: second opening portion 14: dice
16: Casting space 20: Aluminum composite material
20a: Preliminary aluminum composite material 20b: Aluminum composite material core
21: center tensile line 22: carbon fiber core
24: aluminum or aluminum alloy 30: conductor
40: Transmission line

Claims (12)

Preparing a composite casting apparatus equipped with an aluminum melt or an aluminum alloy melt;
Forming a preliminary aluminum composite material in which the aluminum fiber or the aluminum alloy is coated on the outer circumferential surface of the carbon fiber core in the course of transporting the carbon fiber core through the aluminum melt or the aluminum alloy melt;
Wherein the preliminary aluminum composite material is pressed through a die formed at an outlet of the composite casting apparatus to form an aluminum composite material; And
Forming a plurality of aluminum composite materials in a wire shape to form an aluminum composite material core;
Lt; / RTI >
Wherein the casting space of the composite casting apparatus is preheated by the heater unit before the molten aluminum or aluminum alloy is injected into the composite casting apparatus,
The heater unit is divided into multi-sectors, so that the regions divided by the multi-sectors can be controlled independently at a predetermined temperature,
The multi-
A first region where only the molten aluminum or aluminum alloy is present, the first region being maintained at a first temperature higher than the melting point of the aluminum or aluminum alloy;
A second region where the carbon fiber core reacts with the molten aluminum or aluminum alloy to form the preliminary aluminum composite material, the second region being maintained at a second temperature higher than the first temperature; And
A third region in which the preliminary aluminum composite material is pressed by the die, the third region being maintained at a third temperature lower than the first temperature;
And a step of forming the processed transmission line. delete delete The method according to claim 1,
Further comprising the step of enclosing an outer circumferential surface of the aluminum composite core with a conductor. The method according to claim 1,
The aluminum composite material is squeezed according to the shape of the die formed at the outlet of the composite casting apparatus and the shape of the cross section or the thickness of the transverse section of the aluminum composite material is deformed so that the interface of the aluminum composite material or the outer aluminum layer is densely Packed, and free of pores. The method according to claim 1,
The step of forming the aluminum composite material may include continuously supplying the carbon fiber shim to the composite casting apparatus by using a coil to coil method so that the aluminum composite material coated with the aluminum or aluminum alloy on the outer circumferential surface of the carbon fiber shim The method comprising the steps of: delete delete delete delete delete delete

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