KR101157330B1 - Preparing method of Inner Strength Member of Fiber Reinforced Plastics for Overhead Transmission Line - Google Patents

Abstract

The present invention relates to a method for producing a fiber-reinforced plastic center tensile wire used in overhead transmission lines.

The method according to the present invention uses a composition for producing a fiber-reinforced plastic having a specific composition, and at the same time, when the fiber-reinforced plastic is molded, the semi-cured resin is coated with nylon or the like in a prepreg state after the first curing, and then the first twist is performed. By forming the center tensile line by performing the secondary curing, it is possible to provide a overhead transmission line that maintains high tensile characteristics at high temperatures and maintains stable thermal characteristics while being light in weight and improving the deflection phenomenon of the wires.

Overhead power line, center tension line, fiber reinforced plastic, prepreg

Description

Manufacturing method of fiber-reinforced plastic center tensile wire for overhead transmission line {Preparing method of Inner Strength Member of Fiber Reinforced Plastics for Overhead Transmission Line}

The present invention relates to a fiber-reinforced plastic center tensile wire and a method of manufacturing a overhead transmission line including the same by improving thermal properties and improving flexural strength.

Overhead transmission lines transmit electric power spaced from the ground to the air and are generally used to transmit power generated from power plants to substations.

1 is a perspective view of a general overhead transmission line. A typical overhead power transmission line, as shown in FIG. 1, consists of a central tension line 1 and a conductive wire 2 surrounding it. The center tension line (1) serves to maintain the strength of the wire while supporting the overhead transmission line to bear the tension of the overhead transmission line, conventionally used a cable made of steel wire or carbon steel in the center tension line. And the wire (2) surrounding it is made of aluminum and is responsible for the current transport.

Such overhead transmission line is exposed to the external environment, and during the transmission, its temperature rises to 90 ° C. or more to expand the center tensile line supporting the transmission line, thereby causing a sagging of the cable. In particular, the AC ultra-high voltage transmission transmission line is raised to its own temperature to 150 ℃ during transmission, the problem of sagging due to thermal expansion is more problematic. This problem is aggravated by the recent increase in the amount of power transmission. Accordingly, in consideration of the cable sagging phenomenon at high temperature, higher steel towers or shorter intervals between the steel towers have been raised, and economic problems have also emerged.

Therefore, the alternative movement to the composite material made of carbon fiber reinforced plastics or the like instead of the steel wire or carbon steel used in the existing center tensile wire is occurring. This is because the use of carbon fiber reinforced plastics can maintain high tensile properties at high temperatures and improve the deflection of existing metal wires at light weight. However, due to the difficulties and technical problems in molding such carbon fiber reinforced plastics, there has been a problem about a method for producing a central tensile line made of such a material. Such problems include bubble phenomena of the resin, irregular cross-sectional circularity of the cable, and irregular resin content, which are used as a matrix of conventional carbon fiber reinforced plastics. As a problem that occurs during hardening, it has been recognized as the biggest problem in the production of a central tensile line made of fiber-reinforced plastics. In addition, there is a need to mold fiber-reinforced plastics in order to produce fiber-reinforced plastic center tensile lines with improved flexural strength, but there have also been problems in the method of molding fiber-reinforced plastics.

Therefore, there is a need to develop a overhead transmission line including a fiber-reinforced plastic center tensile wire that is shaped to be stable at high temperature and minimize deflection.

One problem to be solved by the present invention is to provide a method for producing a central tensile line of the overhead transmission line that can be stable at high temperatures and minimize the deflection phenomenon.

Another object of the present invention is to provide a method for manufacturing a overhead transmission line including the center tension line.

One aspect of the present invention for achieving the above object is

(S1) preparing a fiber-reinforced plastic composition and fiber comprising a polyfunctional epoxy resin and an aromatic amine curing agent;

(S2) impregnating the fiber into the composition for producing a fiber reinforced plastic;

(S3) passing the fibers impregnated in the composition for producing fiber-reinforced plastic through one or more continuous rollers;

(S4) passing the fiber bundle including one or more fibers passed through the roller through a ceramic hole having a circular cross section;

(S5) first curing the fiber bundle passing through the ceramic hole to form a prepreg fiber reinforced plastic;

(S6) coating the prepreg fiber reinforced plastic;

(S7) disposing the coated one or more prepreg fiber reinforced plastics to twist each other through the first twist; And

(S8) relates to a method for manufacturing a overhead transmission line comprising the step of second curing the twist of prepreg fiber reinforced plastic to form a fiber-reinforced plastic center tensile line.

The multifunctional epoxy resin forming the composition for producing a fiber-reinforced plastic of the present invention is a trifunctional or higher functional epoxy resin, and the composition for producing a fiber-reinforced plastic contains 10 to 50% by weight of an aromatic amine-based curing agent compared to 100% by weight of a multifunctional epoxy resin. It may include.

Aromatic amine curing agents are meta phenylene diamine (MPD), 4,4-dimethylaniline (DDM), diamino diphenyl sulfone (DDS) or mixtures thereof .

The fibers impregnated in the composition for making the fiber reinforced plastics may be one or more carbon fibers, kevlar, polyacrylate fibers, alumina fibers or silicon carbide fibers.

The primary curing of the step (S5) may be performed for 10 seconds to 2 minutes in the temperature range of 80 to 130 ℃, the resin impregnated into the fiber by the primary curing due to the characteristics of the composition comprising an aromatic amine-based curing agent It can be prepregged in a semi-cured state to apply the desired molding to the prepreg fiber reinforced plastics, so that the forming of the center tensile line can be carried out as desired.

The step (S6) may be performed by coating the prepreg fiber reinforced plastic with reinforcing fibers such as nylon or polyester fibers.

The method may further comprise a cooling step at room temperature between the (S7) primary twist step and (S8) secondary curing step.

The secondary curing of the step (S8) may be performed for 1 minute to 10 minutes in the temperature range of 179 to 190 ℃, wherein the resin impregnated in the fiber not completely cured in the primary curing is completely cured.

Another aspect of the present invention for achieving the above object relates to a center tension line of the overhead transmission line with improved heat resistance produced by the manufacturing method, the center tension line of the overhead transmission line is made of fiber-reinforced plastic bundles, The fiber reinforced plastic bundles are arranged such that one or more fiber reinforced plastic wires are twisted with each other, and the fiber reinforced plastics are covered with a covering material.

Another aspect of the present invention for achieving the above object is a process for forming a processed transmission line further comprising the step of arranging a plurality of strands of aluminum conductor in the form of twist outside the center tension line of the processed transmission line manufactured by the manufacturing method It relates to a manufacturing method of a transmission line.

According to embodiments of the present invention, it is possible to provide a center tensile line made of multiple fiber-reinforced plastics that have been twisted to compensate for the conventional disadvantage of difficult twisting after complete curing, thereby providing flexural strength of the center tensile line. It can be improved, and due to the twisted structure compared to the cylindrical center tension line can be obtained the effect of improving the workability with the transmission line for power transmission. In addition, by improving the heat resistance characteristics of the resin used as a base material of the conventional carbon fiber reinforced plastic can improve the temperature at which the center tensile wire can be used to 150 ℃ level, surface bubbles and irregularities, which is a problem of the conventional fiber reinforced plastic It solves the problem of cross section and resin content and maintains stable thermal characteristics by maintaining high tensile characteristics even at high temperatures. As a result, the deflection of the transmission line is less likely to increase the transmission capacity of the transmission tower, and economics can be achieved in terms of the distance and height of the transmission tower.

Hereinafter, with reference to the accompanying drawings will be described in more detail with respect to the present invention.

The present invention provides a method for producing a center tension line of the overhead transmission line that is stable at high temperature and can minimize the phenomenon of phenomena, the center tension line of the overhead transmission line according to the present invention is shown in the flow chart of FIG. It is prepared according to the steps S1) to (S8). 3 is a schematic diagram of equipment used for manufacture of the center tension wire for overhead transmission lines of this invention.

2 and 3, one aspect according to one embodiment of the present invention is

(S1) preparing a fiber-reinforced plastic composition and fiber comprising a polyfunctional epoxy resin and an aromatic amine curing agent;

(S2) impregnating the fiber into the composition for producing a fiber reinforced plastic;

(S3) passing the fibers impregnated in the composition for producing fiber-reinforced plastic through one or more continuous rollers;

(S4) passing the fiber bundle including at least one fiber passed through the roller through a ceramic hole having a circular cross section;

(S5) first curing the fiber bundle passing through the ceramic hole to form a prepreg fiber reinforced plastic;

(S6) coating the prepreg fiber reinforced plastic;

(S7) disposing the coated one or more prepreg fiber reinforced plastics to twist each other through the first twist; And

(S8) relates to a method for producing a center tensile line of a overhead transmission line comprising the step of secondary curing the prepreg fiber reinforced plastic to form a fiber-reinforced plastic center tensile line.

example Embodiments of the present invention are wires used in AC ultra-high voltage transmission transmission line, using a fiber-reinforced plastic instead of Aluminum Conductor Steel Reinforced (ACSR) using conventional carbon steel as a center tensile wire provided inside the overhead transmission line. The present invention relates to a composite wire, and to solve the problems of the existing overhead transmission line by providing a overhead transmission line with improved flexural strength by improving the tensile force at a high temperature, and facilitates the forming of the center tensile line.

In particular, as mentioned above, the conventional AC ultra-high voltage transmission transmission wire has its own temperature rises to 150 ° C during transmission, so the problem of the deflection of the transmission line is more serious, and economical due to the height increase of the transmission tower and the reduction of the gap. There is a problem. The inventors have found that the cause of this problem is due to the thermal properties of the resin, which is the base material of the core core material, and the difficulty in the molding method. As a result of thermal analysis of a resin commonly used in conventional carbon fiber reinforced plastics by differential scanning calorimetry (DSC), the resin used in the prior art has a glass transition temperature (Tg) of about 150 ° C, which degrades physical properties. It was confirmed that is markedly. In addition, in a real situation in which tension is applied, deterioration of physical properties occurs even at a much lower temperature.

In the present invention, by using the composition for producing a fiber-reinforced plastic of a specific composition for the center tension line of the overhead transmission line and introducing a new manufacturing process to produce a center tension line Tg is 180 ℃ or more, the temperature usable to 150 ℃ By providing a center tensile wire made of improved fiber reinforced plastic, the heat resistance of the overhead transmission line is improved.

In addition, in order to be used as the center tensile line, the cross section of each of the fiber-reinforced plastics must be made circular and have a constant diameter, and the content of the fiber and the base resin inside the fiber-reinforced plastics must be kept constant. Conventional manufacturing method of the fiber-reinforced plastics is due to the problem of the choice of the solvent of the thermosetting resin, the curing agent used, and the molding method according to the difference between the bubbles generated on the surface of the fiber-reinforced plastics, irregular cross-section or diameter and difficulty in the molding method It has been a problem. Specifically, the production of the center tensile wire using the conventional carbon fiber reinforced plastics was performed by using an acid anhydride-based curing agent and once the curing was started, the curing could not be stopped before the exothermic reaction was completed. There were a lot of difficulties in twist molding.

In order to solve this problem, the present invention manufactures a fiber-reinforced plastic using a composition for producing a fiber-reinforced plastic having a specific composition, coating the prepregized fiber-reinforced plastic between the first and second curing, and then one or more Conventional acid anhydride-based curing agents by solving the difficult problems in forming after complete curing, including the step of performing a first twist to twist the strands of prepregized fiber-reinforced plastic to each other, and to form a central tensile line and Unlike the case where a composition containing a bifunctional epoxy resin is used and the general curing, twisting of the central tensile line is easy, and after curing, no unnecessary solvents or products remain and bubbles are not generated on the surface.

(S1) Fiber reinforced plastics manufacturing composition and fiber preparation

example Compositions for making fiber reinforced plastics usable in embodiments of the invention include polyfunctional epoxy resins and aromatic amine based curing agents.

The polyfunctional epoxy resin included in the composition for producing a fiber-reinforced plastic is a trifunctional or higher epoxy resin, for example, trimethylol propane-N-triglycidyl, which is a trifunctional epoxy resin. N, N, N`, N`-tetraglycidyl-4,4`-methylene-bis-benzamine (N, N, N '), which is a glycerin trister such as ether) or a tetrafunctional epoxy resin Glycidyl amine, such as N'-tetraglycidyl-4,4'-methylene-bis-benzamine) and tetraglycidyl methylene dianiline (TGMDA), but is not limited thereto. A polyfunctional epoxy resin can be used.

An aromatic amine curing agent may be used as a curing agent of the polyfunctional epoxy resin, which corresponds to a potential curing agent that acts catalytically unlike an acid anhydride curing agent that reacts stoichiometrically with the functional group of an epoxy group. By hardening by dividing into 1st at low temperature and 2nd at high temperature without finishing at once, forming prepreg fiber-reinforced plastic in semi-cured state after the 1st hardening, it is easy to mold fiber-reinforced plastic unlike the fully hardened state By volatilizing the solvent in both curings, it is possible to reduce bubble generation at the surface due to residual solvents or products after completion of the curing reaction. That is, to improve the heat resistance of the fiber-reinforced plastic used as the center tensile line by utilizing the properties that are better than the aliphatic amine-based curing agent. In addition, this may solve the problem of bubble generation on the surface due to residual solvent or product as a complete curing occurs during the primary curing that occurs when using an acid anhydride-based curing agent.

Aromatic amine curing agents include meta phenylene diamine (MPD), 4,4-dimethyl aniline (4,4-dimethylaniline, DDM), diamino diphenyl sulfone (DDS), or mixtures thereof. It may be used, the curing agent may be included in an amount of 10 to 50% by weight relative to 100% by weight of the multifunctional epoxy resin, more preferably 30 to 35% by weight.

The composition for producing a fiber-reinforced plastic may further include a curing accelerator, and the curing accelerator may be an imidazole compound, and may be included in an amount of 0.1 to 4 wt% based on 100 wt% of the polyfunctional epoxy resin, but is not limited thereto. . If it is out of this content range, curing may not be completed completely, or curing may not be complete due to the remaining of the curing agent after curing.

The fibers impregnated in the composition for producing fiber-reinforced plastics may be one or more carbon fibers, kevlar, polyacrylate fibers, alumina fibers or silicon carbide fibers, more preferably using polyacrylonitrile (PAN) based carbon fibers. It is good.

(S2) Impregnated into a composition for manufacturing fiber reinforced plastics

This step is a step of impregnating the fiber prepared in the step (S1) to the fiber-reinforced plastic manufacturing composition. For example, as shown in FIG. 3, it can be performed by impregnating 12 fibers into a resin composition prepared in an impregnation bath.

(S3) roller passing

After impregnating the fibers in the composition for making fiber-reinforced plastics, the resin-impregnated fibers are passed through one or more rollers arranged in series. This is to make it possible to constantly control the resin content in the fiber-reinforced plastics produced by controlling the resin impregnated in the fiber by passing the fiber impregnated with the resin through one or more continuous rollers.

(S4) Pass through ceramic hole

A fiber bundle comprising at least one fiber passed through a roller is passed through a ceramic hole having a circular cross section, whereby the fiber-impregnated fiber bundle is passed through a ceramic hole having a circular cross section so that the fiber reinforced plastic You can have it. At this time, the ceramic hole has a constant cross section so as to form a cross section of the fiber-reinforced plastic in a constant shape. In addition, the use of a ceramic material as the material of the hole having a circular cross section is to prevent the fiber from being damaged by metal or the like.

(S5) Primary Curing (Prepreg)

A step of first curing the fiber bundle passing through the ceramic hole to form a prepreg fiber reinforced plastic. Prepreg refers to a fiber-reinforced plastic semi-hardened impregnated resin, it means a state that is not completely cured to enable a certain molding.

This primary curing may be performed for 10 seconds to 2 minutes in the temperature range of 80 to 130 ℃, it may be carried out by utilizing a facility of passing the oven at a specific temperature, but is not limited thereto. Due to the properties of the composition comprising an aromatic amine curing agent, the resin impregnated into the fiber by primary curing may be prepregized in a semi-cured state to apply a desired molding to the prepreg fiber-reinforced plastic, thereby forming a central tensile line as desired. Can be done.

(S6) sheath

The step of coating the prepreg fiber reinforced plastic, this step can be carried out by coating the prepreg fiber reinforced plastic with reinforcing fibers, such as nylon, polyester fibers. The purpose of performing this step is to facilitate the arrangement of prepreg fiber reinforced plastic wires twisted with each other in order to twist and use several strands of fiber reinforced plastic bundles with the central tension wire of the overhead transmission line. This is because when the primary twisting is performed by arranging the fiber reinforced plastic wires in the semi-cured state without covering and twisting each other, the semi-cured resins lose their boundaries and make it difficult to twist the center tension wire.

(S7) 1st twist

The coated one or more prepreg fiber reinforced plastics are arranged to pretwist with each other prior to complete curing through primary kinks. That is, to improve the flexural strength by including a plurality of strands of fiber-reinforced plastic in order to improve the flexural strength of the center tensile line of the overhead transmission line, such that the fiber-reinforced plastic is twisted with each other, the specific resin composition according to the present invention and This process becomes possible by using a manufacturing process.

For example, it may be performed by arranging one or more fiber-reinforced plastic wires including several strands of fibers to twist each other.

(S8) secondary curing

Twisting the prepreg fiber-reinforced plastics to form a fiber-reinforced plastic center tensile line. The secondary curing of this step can be carried out for 1 minute to 10 minutes in the temperature range of 179 to 190 ℃, wherein the resin impregnated in the fiber not completely cured in the primary curing is completely cured. Secondary curing may be performed by using a facility of passing the curing oven of a specific temperature, but is not limited thereto.

In addition, the manufacturing method of the overhead transmission line according to the present invention may further include a cooling step at room temperature between the (S7) primary twisting step (S8) secondary curing step.

Another aspect of the present invention relates to the center tension line of the overhead transmission line produced by the above manufacturing method. 4 is a perspective view of the center tension line of the overhead transmission line according to the present invention. Referring to Figure 4, the center tension line 30 of the overhead transmission line manufactured according to the manufacturing method of the present invention is made of a bundle of fiber-reinforced plastic (10), the bundle of the fiber-reinforced plastic (10) is one or more fibers The fiber-reinforced plastics single wire 10 which consists of 11 and the base material 12 thermoset | cured while surrounding the said fiber has the shape which twisted several strands mutually. In addition, the fiber reinforced plastic disconnection 10 is coat | covered with the coating material.

Yet another aspect of the present invention is to provide a method for manufacturing a overhead transmission line including a center tensile line of the overhead transmission line manufactured by the above manufacturing method. 5 is a flow chart showing a method of manufacturing a overhead transmission line of the present invention, Figure 6 is a schematic diagram of a method of manufacturing a overhead transmission line of the present invention.

5 and 6, the manufacturing method of the overhead transmission line according to the present invention further comprises a secondary twist step (S9) of disposing a plurality of strands of aluminum conductors in the form of twist outside the center tension wire prepared above Form a overhead transmission line.

The secondary twisting step is a step of finally forming the overhead transmission line by arranging several strands of aluminum conductors through the secondary twist outside the center tensile wire manufactured by secondary curing. 7 is a perspective view of a overhead transmission line according to the present invention. Referring to FIG. 7, the overhead transmission line may be manufactured by twisting the center tension line 30 with the aluminum conductor outside the center tension line 30 obtained in the step (S8). The direction may be the same as or opposite to the direction of the primary twist, and the angle of twist is not particularly limited.

8 is a cross-sectional view of a overhead transmission line and a partial enlarged view of a center tension line according to the present invention. Referring to FIGS. 7 and 8, the overhead transmission line includes a central tensile line 30 made of a bundle of fiber-reinforced plastics 10, wherein the bundle of fiber-reinforced plastics has one or more fiber-reinforced plastic wires 10 twisted together. It is arrange | positioned so that the aluminum conductor 20 may be enclosed by the center tension line 30 outside.

Each fiber-reinforced plastic 10 constituting the center tension line 30 is one or more fibers 11 are arranged in parallel with the center tension line, which is wrapped by the resin 12 thermoset by the resin composition.

In addition, the fiber-reinforced plastics 10 are coated with a covering material, and have a twisted shape, thereby making them more workable with the aluminum conductive wires 20 compared with the conventional cylindrical center tensile wires, which are difficult to form.

Hereinafter, the present invention will be described in more detail with reference to the following examples in order to help understand the present invention, but embodiments according to the present invention may be variously modified, and the scope of the present invention is limited to the following examples. It should not be interpreted.

Example 1

As shown in FIG. 3, a facility including a carbon fiber bobbin, a resin impregnation tank, a roller, and a curing oven was prepared. In addition, a resin composition consisting of 100 parts by weight of tetraglycidyl methylene dianiline (MY720, manufactured by HUNTSMAN), 35 parts by weight of diamino diphenyl sulfone (DDS, manufactured by HUNTSMAN) and 20 parts by weight of acetone was prepared and prepared in a resin impregnation bath. 12 strands of carbon fiber (Toray T-700, grade 12K) are installed in the bobbin with constant tension to pass through the roller after passing through the resin impregnation tank, and the roller is impregnated in the impregnation tank where the resin composition is prepared. Passed and finally passed the ceramic hole. Subsequently, the carbon fibers impregnated in the resin were first cured by passing through a 120 ° C. primary oven, followed by coating nylon 66 on the prepreg carbonized carbon fiber reinforced plastics, and seven coated carbon fiber reinforced plastics first. Twist and twist each other. The prepreg fiber reinforced plastic twist was then passed through a secondary curing oven at 180 ° C. to completely cure the resin impregnated in the fiber and wound in a bobbin to produce a central tensile line.

Comparative Example 1

Instead of the resin composition of the impregnation tank in Example 1, using a resin composition consisting of 100 parts by weight of bisphenol A epoxy resin (Epon 828, The Dow Chemical) and 30 parts by weight of tetrahydrophthalic silver hydride as an acid anhydride-based curing agent, A central tensile line was prepared in the same manner as in Example 1 except that the nylon coating step and the first kink were not performed between the primary and secondary cure.

Experimental Example 1 Experiment on Flexural Strength

In order to measure the bending strength of the center tensile line of the overhead transmission line manufactured in Example 1 and Comparative Example 1, after heating the overhead transmission line to 150 ℃, the bending strength is measured by a universal test machine (Universal Test Machine, Instron 5582) As a result, in the case of Example 1, it was confirmed that the flexural strength of about 25% was dropped, and in the case of Comparative Example 1, the flexural strength was about 70%.

As can be seen from the results of Experimental Example 1, when using a composition comprising a polyfunctional epoxy resin and an aromatic amine-based curing agent, according to the process according to the present invention when the central tensile line of the overhead transmission line is manufactured (Example In 1), the flexural strength was improved, but it was confirmed that the flexural strength was not improved when the existing acid anhydride-based curing agent was used and the conventional curing method was used (Comparative Example 1).

That is, from the results of the experimental examples for the above Examples and Comparative Examples, using a composition for producing a fiber-reinforced plastic comprising a specific composition component as the present invention, and accordingly the first twist to prepreg fiber-reinforced plastic after primary curing After the addition of the molding, it can be seen that when the complete curing in the secondary curing can provide a processed transmission line with improved heat resistance.

Although the present invention has been described in detail with reference to preferred embodiments of the present invention, these are merely exemplary, and those skilled in the art to which the present invention pertains have various modifications and equivalents therefrom. It will be appreciated that embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

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1 is a perspective view of a general overhead transmission line.

2 is a flowchart illustrating a method of manufacturing a center tensile line of a overhead transmission line of the present invention.

3 is a schematic diagram of a method for producing a center tensile wire of a overhead transmission line of the present invention.

Figure 4 is a perspective view of the center tension line of the overhead transmission line according to the present invention.

5 is a flowchart illustrating a method of manufacturing a overhead transmission line of the present invention.

6 is a schematic diagram of a method for manufacturing a overhead transmission line of the present invention.

7 is a perspective view of a overhead transmission line according to the present invention.

8 is a partially enlarged cross-sectional view of a overhead transmission line and a center tension line according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 10, 30: center tension line 2, 20: lead wire

11: carbon fiber 12: thermosetting matrix

Claims (12)

(S1) preparing a fiber-reinforced plastic composition and fiber comprising a polyfunctional epoxy resin and an aromatic amine curing agent; (S2) impregnating the fiber into the composition for producing a fiber reinforced plastic; (S3) passing the fibers impregnated in the composition for producing fiber-reinforced plastic through one or more continuous rollers; (S4) passing the fiber bundle including at least one fiber passed through the roller through a ceramic hole having a circular cross section; (S5) first curing the fiber bundle passing through the ceramic hole to form a prepreg fiber reinforced plastic; (S6) coating the prepreg fiber reinforced plastic; (S7) disposing the coated one or more prepreg fiber reinforced plastics to twist each other through the first twist; And (S8) comprising the step of secondary curing the prepreg fiber reinforced plastic twisted to form a fiber-reinforced plastic center tension line, the method of producing a center tension line of the overhead transmission line. delete The method according to claim 1, wherein the aromatic amine-based curing agent is contained in an amount of 10 to 50% by weight relative to 100% by weight of the polyfunctional epoxy resin. The process of claim 1, wherein the aromatic amine curing agent is meta phenylene diamine (MPD), 4,4-dimethylaniline (DDM), diamino diphenyl sulfone (DDS), or a mixture thereof. Method for producing a central tensile line. The method according to claim 1, wherein the composition for producing fiber-reinforced plastics further comprises a curing accelerator. The method of claim 1, wherein the fiber impregnated in the composition for producing a fiber-reinforced plastic is at least one carbon fiber, kevlar, polyacrylate fiber, alumina fiber, or silicon carbide fiber. The method of claim 1, wherein the primary curing of the step (S5) is characterized in that it is carried out for 10 seconds to 2 minutes in the temperature range of 80 to 130 ℃, the center tension line manufacturing method of the overhead transmission line. The method of claim 1, wherein the step (S6) is performed by coating the prepreg fiber reinforced plastic with nylon or polyester fiber. According to claim 1, characterized in that it further comprises a step of cooling at room temperature between the step (S7) and (S8), the center tension line manufacturing method of the overhead transmission line. The method of claim 1, wherein the secondary curing of the step (S8) is characterized in that it is carried out for 1 minute to 10 minutes in the temperature range of 179 to 190 ℃, the center tension line manufacturing method of the overhead transmission line. delete The processing for forming the overhead transmission line further comprises the step of disposing a plurality of strands of aluminum conductor in the form of twist outside the central tension line of the overhead transmission line manufactured according to any one of claims 1 and 3 to 10. Method of manufacturing transmission line.

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