KR101916231B1

KR101916231B1 - Central strength member for gap conductor and the method for manufacturing thereof

Info

Publication number: KR101916231B1
Application number: KR1020170017385A
Authority: KR
Inventors: 허석봉; 박재성; 강준영; 박재우
Original assignee: 일진복합소재 주식회사
Priority date: 2017-02-08
Filing date: 2017-02-08
Publication date: 2018-11-07
Also published as: WO2018147652A1; KR20180092068A

Abstract

The present invention relates to a center tension line and a method of manufacturing the same, wherein a central tensile line according to the present invention is formed by forming a basalt fiber bundle or a twisted basalt fiber bundle into a twisted structure in a helical shape, A central core bound by a first resin; A center core protective layer formed of the first resin and formed on the outer side of the center core so that the basalt fiber included in the center core is not exposed; An intermediate core which is formed so as to surround the outside of the center core and in which the carbon fiber bundles formed with the carbon fiber or the twisted structure form a twisted structure and the carbon fibers are bound by the second resin; And bundles of the glass fiber and the basalt fiber, which are formed so as to surround the outer side of the intermediate core and in which the fibers or the twisted structure of the glass fiber and the basalt fiber are formed, form a twisted structure in a helical shape, The fibers include an outer core bound by a third resin, and the first resin of the center core protective layer is formed with the intermediate core in a state where at least a part of the outer circumferential surface is melted.

Description

Technical Field [0001] The present invention relates to a core wire for a high-capacity transmission cable and a method for manufacturing the same,

TECHNICAL FIELD The present invention relates to a joist core capable of diagnosing health, and more particularly, to a joist core having improved structural stability and a method for manufacturing the joist.

Demand for transmission and wiring cables increases as demand for electricity increases. As electric power demand increases, new electric cables with increased transmission capacity continue to be installed.

Such electrical cables include a center stranded steel core wound around a stranded aluminum conductor forming the core of the cable. These cables have been used for decades without major changes. However, these cables are vulnerable to bending under a specific load, and are susceptible to corrosion under certain circumstances.

To overcome these drawbacks and increase transmission capacity, other complex based solutions have been developed. Certain such solutions are described in U.S. Patent Nos. 7,060,326; U.S. Published Patent Application 2004-0131834; 2004-0131851; 2005-0227067; 2005-0129942; 2005-0186410; 2006-0051580. This solution has replaced stranded core steel cores with other core components, which are formed from external components formed from carbon fiber materials embedded within the matrix, and non-carbon fiber materials embedded within the resin. The core is formed by pultruding various fibers through pultrusion dies.

Various high-capacity power transmission cables have been developed, such as having a high tensile strength corresponding to the external environment. However, in the case of a center tensile wire such as the one disclosed in US Patent No. 7368162, since the surface of the center core is uneven in the process of forming the center core, the structural stability of the transmission cable including the center core is poor. There was a possibility that disconnection occurred in some sections.

The present invention provides a core wire having a structure capable of maximizing the outer surface of the center tensile wire and increasing the interlayer coupling force, and a transmission cable including the same.

The center tension line according to the present invention is characterized in that a basalt fiber bundle formed with a basalt fiber or a twisted structure forms a twisted structure in a helical shape, and the basalt fibers are bound by a first resin; A center core protective layer formed of the first resin and formed on the outer side of the center core so that the basalt fiber included in the center core is not exposed; An intermediate core which is formed so as to surround the outside of the center core and in which the carbon fiber bundles formed with the carbon fiber or the twisted structure form a twisted structure and the carbon fibers are bound by the second resin; And bundles of the glass fiber and the basalt fiber, which are formed so as to surround the outer side of the intermediate core and in which the fibers or the twisted structure of the glass fiber and the basalt fiber are formed, form a twisted structure in a helical shape, The fibers include an outer core bound by a third resin, and the first resin of the center core protective layer is formed with the intermediate core in a state where at least a part of the outer circumferential surface is melted.

The center core protective layer may be integrally formed with the first resin of the center core.

The first resin may be formed of a thermosetting resin.

The second resin and the third resin may be any one of vinyl ester, epoxy, epoxy / acrylate, phenolic, urethane, and thermosetting resin.

The intermediate core 200 may have a plurality of layer structures.

On the other hand, according to the present invention, there is provided a method for manufacturing a core wire, comprising the steps of: impregnating a first resin with any one of a basalt fiber and a basalt fiber bundle forming a twisted structure; Forming an impregnated basalt fiber or helical twist structure in a helical configuration and forming a twist structure to form a center core; Forming a core by winding a carbon fiber impregnated in a second resin in a helical shape on the outer side of the center core while heating a part of the outer layer of the cured core; And winding one of the glass fiber and the basalt fiber impregnated in the third resin in a helical shape on the outer side of the intermediate core to form an outer core.

The first resin may be a thermosetting resin.

The step of forming the center core may include pressing the core so that the diameter of the center core is within a predetermined range through the drawing die in a state where the helical shape is formed in a twisted structure.

Also, in the step of removing a certain amount of the first resin through the drawing die, the basalt fiber included in the center core can be prevented from being exposed.

The central core according to the present invention forms a center core using basalt fibers and forms an intermediate core and an outer core in a state where the surface of the center core is partially melted, so that the surface of the central tensile line is uniform and the interlayer structural stability Can be improved.

1 is a partially cutaway perspective view showing a transmission cable according to an embodiment of the present invention.
2 is a schematic view showing a state of a transmission line as an example of a transmission cable.
3 is a cross-sectional view showing a state of a center tension line according to an embodiment.
4 is a perspective view showing a basalt fiber according to an embodiment of forming a center core.
5 is a schematic view showing a process of forming a center core according to an embodiment of the present invention.
Fig. 6 is a schematic view showing a process of forming a joist line which is the center of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the absence of special definitions or references, the terms used in this description are based on the conditions indicated in the drawings. The same reference numerals denote the same members throughout the embodiments. For the sake of convenience, the thicknesses and dimensions of the structures shown in the drawings may be exaggerated, and they do not mean that the dimensions and the proportions of the structures should be actually set.

A high capacity transmission cable (capacity expansion transmission cable) according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is an exploded perspective view schematically showing a high-capacity transmission cable according to an embodiment of the present invention, and FIG. 2 is a schematic view schematically showing the installation of a high-capacity transmission cable according to an embodiment of the present invention.

The high-capacity transmission cable 1 according to the embodiment of the present invention includes aluminum conductors 1a and 1b and a core 10 which is the center for forming an inner core.

Generally, such high capacity transmission cables of this type are known as aluminum conductor composite cores (ACCC), reinforced cables, overhead transmission and wiring conductors. Typically, such conductors are used to transmit and route high power and form, for example, the backbone of national power grids.

The high-capacity transmission cable 1 according to the present embodiment includes an aluminum strand having a plurality of cross-sections in a trapezoidal shape that spirally surrounds the central core. The aluminum conductor first layer (1b) is additionally surrounded by an aluminum conductor second layer (1a) having a trapezoidal cross-section. The aluminum conductors 1a and 1b function as passages for transmitting electric power.

The outside of the aluminum conductors 1a and 1b may further include an insulating first protective layer (not shown) as a cover for protecting the first and second aluminum conductors 1a and 1b from corrosion due to an external environment. The first protective layer may be formed using an epoxy resin or the like.

The core wire 10 included in the high capacity transmission cable 1 according to the present embodiment is known as a synthetic core or the like and functions to reinforce the tensile force of the high capacity transmission cable 1. [ The core wire 10 according to the present embodiment includes an outer core 100, an intermediate core 200, and a center core 300. A center core protection layer 390 is formed on the outer side of the center core 300.

The center line 10 will be described later in detail with reference to the drawings.

Referring to FIG. 2, the high-capacity transmission cable 1 can be installed in a process transmission line manner between the electrical poles and the transmission towers 2, and transmits high-voltage, high-capacity power. The transmission voltage of such a high-capacity transmission cable 1 is usually in the range of 2,400 V to 765,000 V, but is not limited thereto.

The high-capacity transmission cable 1 is formed so as to be flexible and warpable, and is conveyed in a wound state using the conveyance and installation drum, and the installation work is performed.

Referring to Figs. 3 and 4, a center line according to one embodiment will be described. 3 is a schematic cross-sectional view illustrating a view of a center tension line according to an embodiment.

As described above, the core wire 10 according to the present embodiment includes the outer core 100, the intermediate core 200, and the center core 300.

The center core 300 according to the present embodiment is formed using basalt fibers and a resin. Basalt fiber is a gray brown fiber made of basalt and melts at about 1400 ℃. Limestone can be added as needed. The molten basalt is made of fiber by a centrifugal process and can be made by ejection through fine nozzles. The basalt fiber is composed of 50% silicon dioxide, 12% aluminum oxide, 11% calcium oxide, 10% magnesium oxide, 7% iron oxide (II), 5% alkali metal oxide Na2O and K2O, 3% titanium oxide It has an average chemical composition of oxides. The resin forming the center core 300 is preferably made of a thermosetting material.

The center core 300 can be manufactured by forming a basalt fiber 301 impregnated with resin or a bundle of basalt fibers 301 formed with a twisted structure in a helical shape as shown in FIG.

The center core protection layer 390 is formed on the outside of the center core 300 so that the basalt fiber included in the center core 300 is not exposed to the outside. The central core protective layer 390 may be at least one of the resins provided to bind the basalt fibers included in the center core 300 and may be formed by forming a twisted structure of the impregnated basalt fiber, It is preferable that the resin is formed in such a manner that a certain amount remains on the surface of the core 300 during the process of removing the resin. That is, the center core protection layer 390 and the resin layer in the center core 300 can be integrally formed through such a method.

The center core protective layer 390 is formed in a molten state at least partially with the resin layer forming the intermediate core 200. The resin forming the center core protective layer 390 uses a thermosetting material. The process for forming such a structure will be described later.

The basalt and glass fiberization processes are very similar, but basalt is one of the next generation fiber materials in terms of production technology and quality compared with glass. The melting point of basalt is around 1450 but varies by chemical composition and is over 300 higher than E-glass fiber. The characteristics of basalt fiber are difficult to generalize, and it is not yet possible to specify / objectify it. Basalt is a natural rock, whose composition depends on the gemstone, and even in single rocks, there is a large difference in chemical composition.

For example, the high tensile strength and Young's modulus are due to the high content of aluminum oxide and silicon dioxide, and the excellent heat resistance and thermal conductivity are attributed to the high iron oxide content. However, in general, the higher the content of the metal oxide, the lower the acid resistance, and the higher the silicon dioxide content, the less alkali resistance.

Because it is produced naturally, it is difficult to compare the characteristics with special glass fiber with constant chemical composition, but most of the properties are superior to E-glass. In addition, basalt fiber is inexpensive, and basalt fiber can be used as a substitute for E-glass in terms of product quality.

The intermediate core 200 is provided so as to surround the outside of the center core 300. The intermediate core 200 may be formed using a carbon fiber and an epoxy resin. That is, a plurality of carbon fiber bundles are used as a reinforcing material for tensile force, and an epoxy resin is used to bind the carbon fiber bundles. The carbon fiber may be wound in a helical shape on the outer circumferential surface of the optical cable 305. In addition, vinyl ester, epoxy / acrylate, phenolic, urethane, and thermosetting resin can be used instead of epoxy resin.

The intermediate core 200 is preferably formed using a carbon fiber and an epoxy resin, but it is also possible to form the intermediate core 200 in a plurality of layered structures. Each of the plurality of layers can be mixed with different materials, i.e., different carbon fiber compositions or non-carbon fibers.

The outer core 100 is provided to surround the intermediate core 200. The outer core 100 is formed of an insulating material. For example, the outer core 100 may be formed of glass fiber or basalt fiber. The outer core 100 may be made of glass fiber or basalt fiber as described above, and an epoxy resin may be used as a binding material. As with the intermediate core 200, vinyl ester, epoxy / acrylate, phenolic, urethane, and thermosetting resin can be used instead of or in addition to epoxy resin.

The outer core 100 and the intermediate core 200 formed of glass fiber or basalt fiber may be provided in a manner of winding in a helical shape.

And an outer core protective layer (not shown) surrounding the outer core 100. The protective layer, i.e., the protective coating, surrounds the outer core 100 and has a radial thickness. The protective coating provides UV protection as well as potential for surface resin corrosion protection and surface electrical tracking. Among other materials, the surface coating may include Reemay-based (polyethylene terephthalate) fibers, paints, polymer coatings such as HETROLAC, such as organic surface-veils such as NEXUS or surface-acrylic based coatings .

An example of a process of forming a center core will be described with reference to Fig. 5 is a schematic diagram illustrating a method of forming a center core according to one embodiment.

A center core is first formed to produce the core 10, which is the center according to one embodiment. First, the basalt fiber 301 is unwound from the bobbin, the wound basalt fiber 301 is impregnated with the resin 302 in the molten state, the twisted structure is formed and then the center core 300 is formed by curing.

Specifically, the center core 300 may be formed by a drawing process. For example, as shown in FIG. 5, the basalt fiber 301 wound from a bobbin may be formed by forming individual stranded structures, And is impregnated in the resin 302 in the molten state. Subsequently, the impregnated basalt fibers 301 are squeezed together and drawn through a first die to form a pre-specified size. Also, the first die functions to remove the resin excessively contained in the basalt fiber 301 having the individual twisted structure impregnated therein. At this time, in the process of removing a certain amount of the first resin through the drawing die, the center core protective layer 390 is formed to prevent the basalt fiber from being exposed to the outside by allowing the basalt fiber contained in the center core 300 to be surrounded by the resin ).

Thereafter, the base core 300 is formed by heating in a primary oven or the like according to need, forming a twisted structure of individual basalt fiber strands 301 as described above, and curing the same through a first hardening unit. The formed center core 300 is wound on another drum and is then provided to a process for forming an intermediate core and an outer core.

An example of a process of forming an intermediate core and an outer core will be described with reference to FIG. FIG. 6 is a schematic view showing a long line manufacturing process which is a center according to an embodiment. FIG.

The center core 300 wound on the drum or the like with the resin in a cured state is unwound and provided for the production of the center tension line.

Specifically, the intermediate core is formed by impregnating the carbon fiber 101 having a twisted structure in an epoxy resin or the like in a resin impregnation tank and then applying it to the outside of the center core 300. At this time, the center core 300, which is wound around the drum, causes at least a portion of the surface to be melted through the heating portion. By applying the carbon fiber 101 or the twisted carbon fiber 102 impregnated into the epoxy resin or the like in a state where at least a part of the outer surface of the center core 300 is melted, Is not formed clearly. A boundary layer physically present between the center core 300 and the intermediate core 200 may be present or a physical / chemical interface may be formed depending on the material. By forming the layer structure on such an interface, the structural stability can be maintained even when the transmission cable is bent for an external force, and the stress can be prevented from being concentrated in any one layer.

The outer core can be formed in the same manner as the intermediate core. Glass fibers 202 having a twisted structure are impregnated in a resin in a resin impregnation tank and then applied to the outside of the intermediate core to form a central joining line.

Thereafter, the excessively applied resin or the like is removed through the second die, and at the same time, the center tension wire 10 is compressed to a predetermined standard. It is also possible to form the core 10 'which is the center where the coating layer is formed on the outside in the coating part after the curing process.

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. have.

1a, 1b: aluminum conductors
10, 10`: center line
100: outer core
101: Glass fiber
102: Glass fiber with a twist structure
200: intermediate core
201: Carbon fiber
202: twisted carbon fiber
300: center core
301: basalt fiber
302: Resin
390: central core protective layer

Claims

Basalt fiber bundles formed with a basalt fiber or a twisted structure form a twisted structure in a helical shape, the basalt fibers being bound by a first resin;
A center core protective layer formed of the first resin and formed on the outer side of the center core so that the basalt fiber included in the center core is not exposed;
The carbon fiber bundles formed to surround the outer side of the center core so as not to form a uniform boundary with the outer circumferential surface of the center core protective layer and formed with a carbon fiber or a twisted structure form a twisted structure, Bonded intermediate core;
Wherein bundles of the glass fiber and the basalt fiber, which are formed so as to surround the outer side of the intermediate core and in which the fibers or the twisted structure of the glass fiber and the basalt fiber are formed, form a twisted structure in a helical shape, And an outer core bound by a third resin,
Wherein the first resin of the center core protective layer is the center at which the intermediate core is formed in a state where at least a part of the outer circumferential surface is melted.

The method according to claim 1,
And the center core protective layer is a center that is formed integrally with the first resin of the center core.

The method according to claim 1,
Wherein the first resin is a center which is formed of a thermosetting resin.

The method according to claim 1,
Wherein the second resin and the third resin are centered on any one of vinyl ester, epoxy, epoxy / acrylate, phenolic, urethane, and thermosetting resin.

The method according to claim 1,
The intermediate core (200) is a center line formed by a plurality of layer structures.

Impregnating the first resin with any one of a basalt fiber bundle and a basalt fiber bundle forming a twisted structure;
Forming an impregnated basalt fiber or helical twist structure in a helical configuration and forming a twist structure to form a center core;
Forming a core by winding a carbon fiber impregnated in a second resin in a helical shape on the outer side of the center core while heating a part of the outer layer of the cured core;
And forming an outer core by winding any one of the glass fiber and the basalt fiber impregnated in the third resin in a helical shape on the outer side of the intermediate core.

The method according to claim 6,
Wherein the first resin is a thermosetting resin.

The method according to claim 6,
Wherein the step of forming the center core includes the step of compressing the center core so that the diameter is within a certain size through the drawing die in a state where the helical shape is formed in a twisted structure.

9. The method of claim 8,
Wherein the step of removing a predetermined amount of the first resin through the drawing die is such that the basalt fiber contained in the center core is not exposed.