WO2018147652A1

WO2018147652A1 - Central tension line for high-capacity power transmission cable and method for manufacturing same

Info

Publication number: WO2018147652A1
Application number: PCT/KR2018/001687
Authority: WO
Inventors: 허석봉; 박재성; 강부민; 박재우
Original assignee: 일진복합소재 주식회사
Priority date: 2017-02-08
Filing date: 2018-02-08
Publication date: 2018-08-16
Also published as: KR101916231B1; KR20180092068A

Abstract

The present invention relates to a central tension line and a method for manufacturing same. The central tension line, according to the present invention, comprises: a central core in which basalt fiber bundles having a twisted structure form the twisted structure in a helical shape, wherein the basalt fibers are bonded using a first resin; a central core protective layer formed using the first resin and formed on the outside of the central core so that the basalt fiber included in the central core is not exposed; a middle core in which carbon fiber or carbon fiber bundles have a twisted structure, wherein the carbon fibers are bonded using a second resin; and an external core formed to surround the outside of the middle core and in which glass fiber and/or the basalt fiber bundles or the glass fiber and the basalt fiber bundles having a twisted structure form the twisted structure in a helical shape, wherein the glass fibers and the basalt fibers are bonded using a third resin.

Description

Center Tensile Line for High Capacity Transmission Cable and Method of Manufacturing the Same

The present invention relates to a central tensile line that can be diagnosed soundness, and more particularly to a central tensile line with improved structural integrity and a method of manufacturing the same.

The demand for power transmission and wiring cables increases as the demand for electricity increases. As electric power demands increase, new electrical cables with increased transmission capacity continue to be installed.

Such electrical cables include a central stranded steel core wound around a stranded aluminum conductor forming the core of the cable. These cables have been in use for decades without major changes. However, these cables have been vulnerable to bending under certain loads and to corrosion under certain circumstances.

To overcome these shortcomings and increase transmission capacity, other complex based solutions have been developed. Certain such solutions are described in US Pat. No. 7,060,326; US Patent Publication 2004-0131834; 2004-0131851; 2005-0227067; 2005-0129942; 2005-0186410; 2006-0051580 and the like. This solution has replaced the stranded core steel core with another core component, which is formed from carbon fiber material embedded within the matrix and external components formed from non-carbon fiber materials embedded within the resin. This core is formed by pultruding various fibers through pultrusion dies.

As such, various high capacity power transmission cables have been developed such as having high tensile strength in response to external environments. However, in the case of the center tension line, such as US Patent Publication 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 such a center tension line is not good, There was a fear of disconnection in some sections.

The present invention provides a center tension line having a structure capable of making the outer surface of the center tension line as uniform as possible and increasing the interlayer bonding force, and a power transmission cable including the same.

The center tensile line according to the present invention is a basalt fiber (basalt fiber) or twisted basalt fiber bundles are formed twisted structure in a helical shape, the basalt fibers are a core core bound by the first resin; A center core protective layer formed of the first resin and formed outside the center core such that the basalt fibers included in the center core are not exposed; An intermediate core formed to surround the outside of the center core, wherein the carbon fiber bundles in which carbon fibers or twist structures are formed form a twist structure, and the carbon fibers bound by a second resin; And bundles of the glass fibers and the basalt fibers formed to surround the outer side of the intermediate core, wherein the bundles of the glass fibers and the basalt fibers are formed of any one of the glass fibers and the basalt fibers, and the twisted structure is formed in a helical shape. The fibers include an outer core bound by a third resin, wherein the first resin of the central core protective layer is formed with the intermediate core in a state in which at least a portion of the outer circumferential surface is molten.

In addition, the center core protective layer may be integrally formed with the first resin of the center core.

In addition, the first resin may be formed of a thermosetting resin.

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

In addition, the intermediate core 200 may be formed in a plurality of layer structures.

On the other hand, the method of producing a central tensile line according to the present invention comprises the steps of: impregnating any one of the basalt fibers and the basalt fiber bundle forming the twist structure in the first resin; Forming a twisted structure of the impregnated basalt fiber or helical shape into a helical shape and hardening to form a central core; Forming an intermediate core by winding a carbon fiber impregnated in the second resin in a helical shape while heating a portion of the outer layer of the cured central core in a helical shape; And winding one of the glass fibers and the basalt fibers impregnated into the third resin in a helical shape to form an outer core.

In addition, the first resin may be a thermosetting resin.

In addition, the forming of the central core may include a step of compressing the diameter within a predetermined standard through a drawing die in a state where the twist structure is formed in the helical shape.

In addition, in the step of removing a predetermined amount of the first resin through the drawing die may be such that the basalt fibers contained in the central core is not exposed.

The center tensile line according to the present invention forms a center core using basalt fibers, and forms a middle core and an outer core in a state in which the surface thereof is partially melted, thereby making the surface of the center tensile line uniform and interlaminar structural stability. Can be improved.

1 is a partial cutaway perspective view showing a state of a power transmission cable according to an embodiment of the present invention.

2 is a schematic diagram showing a state of a overhead transmission line as an example of a transmission cable.

3 is a cross-sectional view illustrating a state of a center tensile line according to an exemplary embodiment.

4 is a perspective view showing the appearance of basalt fibers according to one embodiment forming a central core.

5 is a schematic diagram illustrating a process of forming a central core according to an embodiment of the present invention.

6 is a schematic view showing a step of forming a center tensile line of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Unless otherwise defined or mentioned, terms indicating directions used in the present description are based on the states shown in the drawings. In addition, the same reference numerals throughout the embodiments indicate the same member. On the other hand, each of the components shown in the drawings may be exaggerated in thickness or dimensions for the convenience of description, and does not mean that actually should be configured by the ratio between the dimensions or configurations.

A high capacity power transmission cable (enhanced power transmission cable) according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is a cutaway perspective view schematically illustrating a high capacity power transmission cable according to an embodiment of the present invention, and FIG. 2 is a schematic view schematically showing a state in which a high capacity power transmission cable according to an embodiment of the present invention is installed.

The high capacity power transmission cable 1 according to an embodiment of the present invention includes

aluminum conductors

1a and 1b and a center tension line 10 forming a core inside.

Generally, this type of high capacity power transmission cable is known as an aluminum conductor composite core (ACCC), a reinforcement cable, a stranded overhead transmission and a wiring conductor. Typically, such conductors are used to transmit and wire high power and form, for example, the backbone of a national grid.

The high-capacity power transmission cable 1 according to the present embodiment includes aluminum strands having a trapezoidal shape in a plurality of cross-sections spirally surrounding the central tensile line. The aluminum conductor first layer 1b is further surrounded by the aluminum conductor second layer 1a having a trapezoidal cross section. The

aluminum conductors

1a and 1b function as passages for transmitting power.

The outer side of the

aluminum conductors

1a and 1b may further include an insulating first protective layer (not shown) as a coating for protecting against corrosion or the like caused by an external environment. The first protective layer may be formed using an epoxy resin or the like.

The center tensile line 10 included in the high capacity power transmission cable 1 according to the present embodiment is known as a synthetic core, etc., and serves to reinforce the tensile force of the high capacity power transmission cable 1. The center tensile line 10 according to the present embodiment includes an outer core 100, an intermediate core 200, and a central core 300. The center core protective layer 390 is formed outside the center core 200.

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

Referring to FIG. 2, the high capacity power transmission cable 1 may be installed in the form of overhead transmission lines connected between electric poles and power transmission towers 2, and transmits high voltage and high capacity power. The transmission voltage of this high capacity power transmission cable 1 is typically in the range of 2,400 V to 765,000 V, but is not limited thereto.

The high-capacity power transmission cable 1 is formed to be flexible and flexible, and is transported in a wound state using a drum for transport and installation, and installation work is performed.

A center tensile line according to an embodiment will be described with reference to FIGS. 3 and 4. 3 is a schematic cross-sectional view showing a state of a central tensile line according to an embodiment.

As described above, the center tensile line 10 according to the present embodiment includes an outer core 100, an intermediate core 200, and a central core 300.

The central core 300 according to the present embodiment is formed using basalt fibers and a resin. Basalt fibers are gray-brown fibers made of basalt and melt at about 1400 ° C. Limestone may be added as needed. The molten basalt is made of fibers by centrifugal processes and can be produced by blowing through a fine nozzle. Basalt fiber is 50% silicon dioxide, 12% aluminum oxide, 11% calcium oxide, 10% magnesium oxide, 7% iron (II) oxide, 5% alkali metal oxides Na2O and K2O, 3% titanium oxide (IV) and 2% different It has an average chemical composition of oxide. The resin forming the core core 300 is preferably formed of a thermosetting material.

The center core 300 may be manufactured by forming a twist structure in a helical shape from a basalt fiber 301 impregnated in resin or a bundle of basalt fibers 301 in which a twist structure is formed.

The central core protective layer 390 is formed on the outside of the central core 300 so that the basalt fibers included in the central core 300 are not exposed to the outside. The central core protective layer 390 may be at least one of resins provided to bind the basalt fibers included in the central core 300, and may be excessively included in the die after forming the twisted structure of the impregnated basalt fibers. In the process of removing the resin, it is preferable to form a predetermined amount to remain on the surface of the central core (300). That is, through the above method, the central core protective layer 390 and the resin layer in the central core 300 may be integrally formed.

In addition, the center core protective layer 390 is formed in a state in which at least a portion of the resin layer forming the intermediate core 200 is molten. The resin for forming the core core protective layer 390 uses a thermosetting material. The process for forming such a structure will be described later.

The fibrous process of basalt and glass is very similar, but basalt is one of the next generation fiber materials in terms of production technology and quality compared to glass. The melting point of basalt reaches about 1450, but depends on chemical composition and is higher than 300 compared to E-glass fiber. The characteristics of basalt fibers are difficult to generalize, and there are many areas that have not yet been identified because they cannot be specified / objectived. Basalt is a natural rock. The composition of the rock depends on the raw stone, and the chemical composition of the rock varies greatly.

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 due to the high iron oxide component. However, in general, the higher the content of the metal oxide, the better the acid resistance, and the higher the content of the silicon dioxide, the poor the alkali resistance.

Because it is naturally produced, it is difficult to compare characteristics with special glass fibers with a constant chemical composition, but most of them are superior to E-glass. In addition, basalt fiber is cheaper in raw materials and basalt fiber can be used as an alternative material for E-glass in terms of product quality.

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

The intermediate core 200 is preferably formed using a carbon fiber and an epoxy resin, but may be formed in a plurality of layer structures according to a manufacturing method. Each of the plurality of layers can be mixed with different materials, ie with 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 may use an epoxy resin as a binding material. In addition to the intermediate core 200, a vinyl ester, an epoxy / acrylate, a phenolic, urethane, or a thermosetting resin may be used in place of or together with the epoxy resin.

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

It may also include an outer core protective layer (not shown) surrounding the outer core 100. The protective layer, ie the protective coating, surrounds the outer core 100 and has a radial thickness. The protective coating provides not only UV protection but also potential for surface resin corrosion protection and surface electrical tracking. Among other materials, surface coatings may include fiber, paint, and polymer coatings of Reemay based (polyethylene terephthalate) such as HETROLAC, such as organic surfacing veils such as NEXUS or surface acrylic based coatings. .

An example of a process of forming a central core will be described with reference to FIG. 5. 5 is a schematic view illustrating a method of forming a center core according to an embodiment.

In order to manufacture the central tensile line 10 according to an embodiment, a central core is first formed. First, the basalt fiber 301 is unwound from the bobbin, and the unwinded basalt fiber 301 is impregnated in the resin 302 in a molten state, and a twisted structure is formed and then hardened to form a central core 300.

Specifically, the core core 300 may be formed by a drawing process. For example, as illustrated in FIG. 5, the basalt fiber 301 unrolled from the bobbin may form an individual stranded structure, followed by a resin impregnation bath. It is impregnated to resin 302 of the molten state. Subsequently, the impregnated basalt fibers 301 are drawn together through a first die to compact together to form a predetermined specification. The first die also functions to remove resin that is excessively contained in the basalt fibers 301 in which the individual twist structures are formed. At this time, in the process of removing a predetermined amount of the first resin through the drawing die, the basalt fibers included in the core core 300 are surrounded by the resin, thereby preventing the basalt fibers from being exposed to the outside. ).

Thereafter, after heating in a primary oven or the like as necessary, the twisted structures of the individual basalt fibers 301 stranded structures as described above are formed and then cured through the first curing unit to form the core core 300. The formed core core 300 is wound on another drum and then provided to the process for the formation of the intermediate core and the outer core.

An example of a process of forming the intermediate core and the outer core will be described with reference to FIG. 6. 6 is a schematic diagram illustrating a process of manufacturing a center tensile line according to an embodiment.

The center core 300 wound on a drum or the like in a state where the resin is cured is unwound and provided to manufacture a center tensile line.

Specifically, the intermediate core is formed by impregnating the carbon fiber 101 having the twisted structure with an epoxy resin or the like in a resin impregnation tank, and then applying it to the outside of the central core 300. At this time, the central core 300 unwound from the drum allows at least a part of the surface to be molten through the heating part. As described above, the interface between the center core 300 and the intermediate core is applied by applying the carbon fiber 101 or the twisted structure carbon fiber 102 impregnated with an epoxy resin or the like while at least a part of the outer surface of the center core 300 is molten. This should not be formed distinctly. A physically mixed boundary layer may exist between the central core 300 and the intermediate core 200, or a physical / chemical interface may be formed according to a material. By forming a layer structure on such an interface, structural stability can be maintained even when the transmission cable is bent for external force, and stress can be prevented from being concentrated on any one layer.

The outer core can be formed in the same manner as the intermediate core. The central tensile line is formed by impregnating the glass fiber 202 or the like having the twisted structure with the resin in the resin impregnation tank and then applying it to the outside of the intermediate core.

Thereafter, excessively applied resin or the like is removed through the second die, and at the same time, the central tensile line 10 is pressed to a certain standard. After the curing process, it is also possible to form a central tension line (10`) formed with a coating layer on the outside in the coating portion.

Although the preferred embodiment of the present invention has been described above, the technical idea of the present invention is not limited to the above-described preferred embodiment, and may be variously implemented in a range without departing from the technical idea of the present invention specified in the claims. have.

Claims

A basalt fiber or a basalt fiber bundle having a twisted structure formed therein with a helical shape, the basalt fibers comprising: a central core bound by a first resin;

A center core protective layer formed of the first resin and formed outside the center core such that the basalt fibers included in the center core are not exposed;

An intermediate core formed to surround the outside of the center core, wherein the carbon fiber bundles in which carbon fibers or twist structures are formed form a twist structure, and the carbon fibers bound by a second resin;

The bundles of the glass fiber and the basalt fiber formed to surround the outer side of the intermediate core, the fiber or the basalt fiber of any one of the glass fiber and the basalt fiber are formed in a helical shape, and the glass fiber and the basalt fiber Includes a third resin bound outer core; and

A center tension line in which the intermediate core is formed in a state in which at least a portion of an outer circumferential surface of the first resin of the central core protective layer is molten.
The method of claim 1,

The center core protective layer is a central tensile line formed integrally with the first resin of the center core.
The method of claim 1,

The first resin is a central tensile line formed of a thermosetting resin.
The method of claim 1,

The second resin and the third resin is a center tension line which is any one of vinyl ester, epoxy, epoxy / acrylate, phenolic, urethane, thermosetting resin.
The method of claim 1,

The intermediate core 200 is a center tension line is formed of a plurality of layer structure.
Impregnating either of the basalt fibers and the basalt fiber bundle forming the twisted structure to the first resin;

Forming a twisted structure of the impregnated basalt fiber or helical shape into a helical shape and hardening to form a central core;

Forming an intermediate core by winding a carbon fiber impregnated in the second resin in a helical shape while heating a portion of the outer layer of the cured central core in a helical shape;

And forming an outer core by winding one of the glass fibers and the basalt fibers impregnated in the third resin into a helical shape on the outside of the intermediate core.
The method of claim 6,

Wherein said first resin is a thermosetting resin.
The method of claim 6,

In the step of forming the center core, the method of manufacturing a center tension line comprising the step of pressing so that the diameter is within a predetermined standard through the drawing die in the form of the twist structure in the helical shape.
The method of claim 8,

The method of manufacturing a center tension liner so that the basalt fibers contained in the center core are not exposed in the step of removing a predetermined amount of the first resin through the drawing die.