KR102560551B1 - Core for electrical power transmission cable and method for manufacturing the same - Google Patents

Abstract

Transmission cable core according to the present invention,
A primary core formed by binding unidirectional carbon fiber bundles gathered in a circle with a primary resin; a secondary core formed by binding unidirectional carbon fiber bundles surrounding an outer surface of the primary core with a secondary resin; a tertiary core formed by spirally winding unidirectional carbon fiber bundles impregnated with a secondary resin remaining after forming the secondary core on an outer surface of the secondary core; and a cover layer formed by covering an outer surface of the tertiary core with an anti-corrosion mat impregnated with the secondary resin remaining after forming the secondary core.
If the present invention is used, the tensile strength can be increased from 2.2 GPa to 3.4 GPa and the operating temperature can be increased from 180 ° C to 220 ° C compared to the conventional steel core aluminum stranded core. In addition, the distance between transmission towers can be increased from 300 meters to 500 meters in the prior art, and transmission efficiency can be increased up to 220% compared to the prior art.

Description

Transmission cable core and method for manufacturing the same {CORE FOR ELECTRICAL POWER TRANSMISSION CABLE AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a transmission cable core and a method for manufacturing the same.

In general, aluminum conductor steel reinforced (ACSR) is used as a transmission cable. However, steel-core aluminum strands are prone to sagging and corrosion due to a temperature rise caused by an increase in power transmission.

Recently, in order to solve these problems and increase the amount of transmission, an aluminum conductor composite core (ACCC), in which the steel core is replaced with a composite material core, has been used.

As shown in FIG. 1, this composite core aluminum stranded wire is composed of a composite core and an aluminum conductor 2 surrounding it. The composite core is composed of an inner core 1a made of carbon fiber and epoxy resin, and an outer core 1b made of glass fiber and epoxy resin surrounding the outside of the inner core 1a.

The composite core 1 is manufactured by a pultruding method. However, the inner core 1a has a fairly large diameter and takes a long time to harden. In addition, the outer core (1b) formed of glass fiber is responsible for corrosion protection and bending performance, but has weak tensile strength due to low rigidity.

Korean registered patent (10-1046215)

An object of the present invention is to provide a transmission cable core capable of solving the above problems and a method for manufacturing the same.

The transmission cable core for achieving the above object,

A primary core formed by binding unidirectional carbon fiber bundles gathered in a circle with a primary resin;

a secondary core formed by binding unidirectional carbon fiber bundles surrounding an outer surface of the primary core with a secondary resin;

a tertiary core formed by spirally winding unidirectional carbon fiber bundles impregnated with a secondary resin remaining after forming the secondary core on an outer surface of the secondary core; and

It is characterized in that the anti-corrosion mat impregnated with the secondary resin remaining after forming the secondary core includes a cover layer formed to cover the outer surface of the tertiary core.

In addition, the above purpose,

A first step of forming a primary core by primary pultrusion and curing of a unidirectional carbon fiber bundle impregnated with primary resin;

a second step of forming a secondary core by attaching a unidirectional carbon fiber bundle impregnated with a secondary resin to an outer surface of the primary core;

a third step of forming a tertiary core by spirally winding unidirectional carbon fiber bundles impregnated with a secondary resin remaining after forming the secondary core on an outer surface of the secondary core;

a fourth step of forming a cover layer by covering the outer surface of the tertiary core with the corrosion-resistant mat impregnated with the secondary resin remaining after forming the secondary core; and

and a fifth step of secondary drawing and hardening a preliminary core composed of the primary core, the secondary core, the tertiary core, and the cover layer into a set shape.

According to the present invention, a conventional core having a large diameter is continuously divided into primary and secondary cores. As a result, it is possible to shorten the manufacturing time of the power transmission cable core. In addition, if the resin included in the primary core is cured first, even if the resin contained in the secondary core is less cured, since the primary core is not deformed and holds the center, the tertiary core can be quickly wound around the secondary core that is moving in the direction of the second drawing die (process progress direction) for secondary pultrusion. When the tertiary core is quickly wound around the secondary core in this way, the pitch interval of the tertiary core is reduced (less than 50 pitches), so that the bending performance of the transmission cable core can be improved.

In the present invention, a resin for improving the resin impregnation rate is applied as a primary resin, and a resin for preventing deterioration of the resin is applied as a secondary resin, and different resins can be applied according to functions. Due to this, the physical properties of the power transmission cable core can be adjusted in various ways.

The present invention covers the outer surface of the tertiary core with an anti-corrosion mat impregnated with the secondary resin remaining after forming the secondary core to form a cover layer, thereby preventing galvanic corrosion caused by contact between the tertiary core and the aluminum conductor surrounding the tertiary core. In addition, it protects the tertiary core and improves the tensile strength of the transmission cable core.

If the present invention is used, the tensile strength can be increased from 2.2 GPa to 3.4 GPa and the operating temperature can be increased from 180 ° C to 220 ° C compared to the conventional steel core aluminum stranded core. In addition, the distance between transmission towers can be increased from 300 meters to 500 meters in the prior art, and transmission efficiency can be increased up to 220% compared to the prior art.

1 is a view showing a power transmission cable according to the prior art.
2 is a diagram showing a transmission cable to which a transmission cable core according to an embodiment of the present invention is applied.
FIG. 3 is a view showing the transmission cable core shown in FIG. 2;
4 is a flowchart illustrating a method for manufacturing a transmission cable core according to an embodiment of the present invention.
5 is a view showing an apparatus for manufacturing a transmission cable core according to an embodiment of the present invention.

Hereinafter, a transmission cable core according to an embodiment of the present invention will be described in detail.

As shown in FIGS. 2 and 3, the transmission cable core 10 according to an embodiment of the present invention is composed of a primary core 11, a secondary core 12, a tertiary core 13, and a cover layer 14.

[Primary Core]

The primary core 11 forms the center of the transmission cable core 10. The primary core 11 has a circular cross section and extends in the longitudinal direction. In the primary core 11, the carbon fiber bundles CF of the valve 16 gathered in a circle are bound by primary resin.

The unidirectional carbon fiber bundle (CF) is formed of a plurality of carbon fiber filament bundles extending in one direction without twisting.

The primary resin is impregnated between the unidirectional carbon fiber bundles (CFs) gathered in a circle to bind the unidirectional carbon fiber bundles (CFs).

As the primary resin, a high-strength, high-temperature-resistant resin is used to improve the resin impregnation rate. The primary resin is cured in the range of approximately 180°C to 200°C.

[Second Core]

The secondary core 12 is formed on the outer surface of the primary core 11 . The secondary core 12 is formed by unidirectional carbon fiber bundles (CFs) disposed on the outer surface of the primary core 11 in the longitudinal direction and bound by a secondary resin.

The secondary resin is impregnated between the unidirectional carbon fiber bundles (CFs) to bind the unidirectional carbon fiber bundles (CFs).

As the secondary resin, a high-strength, high-temperature-resistant resin is used to prevent deterioration of the resin. The secondary resin is cured in the range of approximately 180°C to 200°C.

As the secondary resin, the same resin as the primary resin may be used, but different resins may be used. The primary resin and the secondary resin bind the primary core 11 and the secondary core 12 .

[3rd Core]

The tertiary core 13 is formed on the outer surface of the secondary core 12 . The tertiary core 13 is formed by spirally winding unidirectional carbon fiber bundles (CFs) bound by the secondary resin remaining after forming the secondary core 12 on the outer surface of the secondary core 12 . The pitch interval of the tertiary core 13 is 50 pitches or less. The reason for the small pitch interval (the reason for the high pitch) is as follows.

According to the present invention, a conventional core having a large diameter is continuously divided into primary and secondary cores. Because of this, if the resin included in the primary core 11 is cured first, even if the resin contained in the secondary core 12 is less cured, the primary core 11 is not deformed and holds the center, so that the tertiary core 13 can be quickly wound around the secondary core 12 advancing in the direction of the second drawing die 125 (process progress direction, see FIG. 5). Due to this, the pitch interval of the tertiary core 13 may be reduced. The secondary resin binds the secondary core 12 and the tertiary core 13 together.

[Cover layer]

The cover layer 14 is formed on the outer surface of the tertiary core 13 . The cover layer 14 is formed by covering the outer surface of the tertiary core 13 with the anti-corrosion mat M impregnated with the secondary resin remaining after forming the secondary core 12 . The cover layer 14 prevents galvanic corrosion caused by contact between the tertiary core 13 and the aluminum conductor 20 .

The anti-corrosion mat M is formed of fabric usable for anti-corrosion. The fabric may be formed of any one or a mixture of Basalt fibers, Innegra fibers, Dyneema fibers, and Aramid fibers.

Basalt fiber is a basalt-based fiber, has good fiber insulation, and has improved physical properties of 110 to 120% of glass fiber. Innegra fiber is a PP (Polypropylene) based fiber, has good insulation and elongation, and has a low heat resistance of 150℃. Dyneema fiber is a fiber based on UHMWPE (Ultra High Molecular Weight Polyethylene), and has light weight, high strength, good fiber insulation, and heat resistance as low as 100 ℃. Aramid fibers are nylon-based fibers, and have good strength, wear resistance, high heat resistance, and fiber insulation. The secondary resin binds the tertiary core 13 and the cover layer 14 .

Hereinafter, a method for manufacturing a transmission cable core according to an embodiment of the present invention will be described in detail. Reference is made primarily to FIGS. 2 , 3 , and 5 .

As shown in FIG. 4, a method for manufacturing a power transmission cable core according to an embodiment of the present invention,

A first step (S11) of forming a primary core by primary pultrusion and curing of a unidirectional carbon fiber bundle impregnated with primary resin;

A second step (S12) of forming a secondary core by attaching a unidirectional carbon fiber bundle impregnated with a secondary resin to the outer surface of the primary core;

a third step (S13) of forming a tertiary core by spirally winding unidirectional carbon fiber bundles impregnated with a secondary resin remaining after forming the secondary core on an outer surface of the secondary core;

a fourth step (S14) of forming a cover layer by covering the outer surface of the tertiary core with the anti-corrosion mat impregnated with the secondary resin remaining after forming the secondary core; and

It consists of a fifth step (S15) of secondary drawing and hardening of a preliminary core composed of the primary core, the secondary core, the tertiary core, and the cover layer into a set shape.

Hereinafter, the first step (S10) will be described.

The first step (S10) is a pultruding method, and the second step (S20) to the fifth step (S50) are performed by a pull-winding method. Full winding molding is a method in which pultrusion and winding molding are performed together. Therefore, during each step, the preliminary core being molded is continuously pulled by a traction device (not shown).

A primary core 11 made of unidirectional carbon fiber bundles (CFs) bound by a primary resin is formed. The primary core 11 is formed by first drawing and curing unidirectional carbon fiber bundles (CFs) impregnated with primary resin into a set shape.

The unidirectional carbon fiber bundle (CF) is formed of a plurality of carbon fiber filament bundles extending in one direction, and is prepared by being wound on a bobbin.

The first step includes a 1-1 step (S11) of supplying a plurality of unidirectional carbon fiber bundles impregnated with the primary resin; A first-second step (S12) of converging the supplied plurality of unidirectional carbon fiber bundles in a circular shape; and first to third steps (S13) of compressing and hardening the bundles of the unidirectional carbon fibers to a set diameter through a first drawing die.

[Step 1-1]

A plurality of unidirectional carbon fiber bundles (CFs) impregnated with the primary resin are supplied while being separated through the first supply unit 111 . Impregnating the unidirectional carbon fiber bundles (CFs) into the resin may be performed in a known manner.

[Step 1-2]

The supplied plurality of unidirectional carbon fiber bundles (CFs) are pulled through the first guide 112 and collected into circular unidirectional carbon fiber bundles (CFs). A circular hole is formed in the center of the first guide 112 to gather a plurality of unidirectional carbon fiber bundles (CFs) in a circular shape, and to remove excess primary resin from the unidirectional carbon fiber bundles (CFs).

[Steps 1-3]

The concentrated unidirectional carbon fiber bundles (CF) are compressed into a circular shape with a set diameter through the first drawing die 113. The first drawing die 113 is heated to a curing temperature, and the primary resin impregnated into the unidirectional carbon fiber bundles CF is cured while passing through the first drawing die 113 .

Hereinafter, the second step (S20) will be described.

A secondary core 12 is formed on the outer surface of the cured primary core 11 . The secondary core 12 is formed by attaching unidirectional carbon fiber bundles (CF) impregnated with a secondary resin to the outer surface of the cured primary core 11 .

The second step includes a 2-1 step (S21) of supplying a plurality of unidirectional carbon fiber bundles impregnated with the secondary resin; and a 2-2 step (S22) of converging and attaching the supplied plurality of unidirectional carbon fiber bundles to the outer surface of the hardened primary core.

[Step 2-1]

A plurality of unidirectional carbon fiber bundles (CFs) impregnated with secondary resin are supplied while being separated through the second supply unit 121 . Impregnating the unidirectional carbon fiber bundles (CF) into the secondary resin is performed in the same manner as in step 1-1 (S11).

[Step 2-2]

While the cured primary core 11 and the supplied plurality of unidirectional carbon fiber bundles CF are pulled through the second guide 122, the unidirectional carbon fiber bundles CF impregnated with the secondary resin are collected and attached to the outer surface of the primary core 11. A circular hole is formed in the center of the second guide 122, the primary core 11 is positioned at the center of the circular shape, and the secondary core 12 is positioned on the outer surface of the primary core 11 and pulled. The second guide 122 gathers the secondary core 12 formed on the outer surface of the primary core 11 in a circular shape and arranges excess secondary resin on the unidirectional carbon fiber bundle CF.

Hereinafter, the third step (S30) will be described.

A tertiary core 13 is formed on the outer surface of the secondary core 12 . The tertiary core 13 is formed by spirally winding unidirectional carbon fiber bundles (CF) impregnated with a secondary resin on the outer surface of the secondary core 12 with a pull winding unit 123 . Since the unidirectional carbon fiber bundles CF are wound on the outer surface of the secondary core 12 after the primary core 11 is cured, the unidirectional carbon fiber bundles CF can be wound around the secondary core 12 at a high pitch. The reason is as described above.

Hereinafter, the fourth step (S40) will be described.

The anti-corrosion mat M impregnated with the secondary resin is guided through the third guide 124 and surrounded by the outer surface of the tertiary core 13 in a circular shape. Due to this, the cover layer 14 is formed on the outer surface of the tertiary core 13 .

Hereinafter, the fifth step (S50) will be described.

The preliminary core on which the primary core 11, the secondary core 12, the tertiary core 13, and the cover layer 14 are formed is subjected to secondary pultrusion and hardening. The preliminary core is compressed and hardened to a set diameter while passing through the second drawing die 125 .

Through the first step (S10) to the fifth step (S50) as described above, the transmission cable core 10 is manufactured.

1, 10: transmission cable core 2, 20: aluminum conductor
11: primary core 12: secondary core
13: tertiary core 14: cover layer
111: first supply unit 112: first guide
113: first drawing die 121: second supply unit
122: second guide 123: full winding unit
124: third guide 125: second drawing die
M: anti-corrosion mat

Claims (5)

A primary core formed by circularly gathering unidirectional carbon fiber bundles; a secondary core in which unidirectional carbon fiber bundles are formed surrounding an outer surface of the primary core; a tertiary core formed by spirally winding unidirectional carbon fiber bundles around an outer surface of the secondary core; And to manufacture a transmission cable core composed of a cover layer formed by covering the outer surface of the tertiary core with an anti-corrosion mat,
A first step of forming a primary core in which the primary resin is completely cured;
a second step of forming the secondary core by surrounding an outer surface of the primary core with a unidirectional carbon fiber bundle impregnated with a secondary resin;
A third step of forming a tertiary core impregnated with the spirally wound unidirectional carbon fiber bundles with secondary resin remaining after forming the secondary core by spirally winding unidirectional carbon fiber bundles on the outer surface of the secondary core;
a fourth step of covering the outer surface of the tertiary core with the anti-corrosion mat and attaching the anti-corrosion mat to the outer surface of the tertiary core with a secondary resin remaining after forming the secondary core to form a cover layer; and
and a fifth step of compressing and hardening the preliminary core composed of the primary core, the secondary core, the tertiary core, and the cover layer through a second drawing die to a set diameter. According to claim 1,
The transmission cable core manufacturing method, characterized in that the primary resin or the secondary resin is the same or different. delete The method of claim 1, wherein the anti-corrosion mat,
A transmission cable core manufacturing method characterized in that it is formed by any one or a mixture of basal fiber, Innegra fiber, Dyneema fiber, and Aramid fiber. delete