KR20180092067A - Central strength member for gap conductor with optical fiber and the gap conductor having the same - Google Patents

Abstract

The present invention relates to a central tensile line capable of diagnosing integrity. Specifically, according to the present invention, the central tensile line comprises: an inner core including a carbon fiber; an external core surrounding the inner core, and including at least any one of a glass fiber and a basalt fiber; and an optical fiber provided in the internal core, and having an optical fiber transmitting an optical signal. According to the present invention, a high capacity transmission cable has the optical cable functioning as a passage capable of transmitting the optical signal to the internal core, thereby analyzing the transmitted optical signal to diagnose integrity of the high capacity tranmission cable at a certain section, and adjusting the number of times of twisting per the unit length of a plurality of optical fibers provided in the internal core to adjsut sensitivity to diagnose an abnormality or a vulnerable point if they occur.

Description

Technical Field [0001] The present invention relates to a core wire for a high-capacity transmission cable having a diagnostic fiber, and a transmission cable including the core fiber.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a core that is capable of diagnosing a health condition, and more particularly, to a core having a configuration part that can be used for diagnosing the aging and the health of the power line itself.

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, the overall cable does not have a uniform lifetime under various circumstances, and there may be a problem with the soundness of the transmission cable in some cable transmission sections due to problems such as local harsh environment or formation of weak point of partial durability.

The present invention provides a high-capacity transmission cable having means for diagnosing the health of a certain section.

The present invention also provides a high capacity transmission cable capable of adjusting the sensitivity of the health diagnosis.

The central core according to the present invention comprises an inner core comprising carbon fibers; An outer core surrounding the inner core and comprising at least one of glass fiber and basalt fiber; And an optical cable provided on the inner core and including an optical fiber for transmitting an optical signal.

The optical fiber may further include: an optical fiber core for transmitting the optical signal; And an optical fiber clad layer surrounding the optical fiber core.

And may further include a coating layer surrounding the at least one optical fiber.

The coating layer may be formed by winding carbon fibers on the coating layer.

Also, the inner core may be formed in such a manner that the carbon fibers included in the inner core are wound along the longitudinal direction on the outer circumferential surface of the optical cable.

The optical fiber may be provided in plurality.

The plurality of optical fibers may be twisted in such a manner that they are wound three to seven times per meter.

Also, the plurality of optical fibers may form a twisted structure with respect to any one of the optical fibers.

Also, any one of the glass fiber and the basalt fiber included in the outer core may be wound along the longitudinal direction on the outer circumferential surface of the inner core.

On the other hand, the high-capacity transmission cable according to the present invention is a cable having a center line according to any one of claims 1 to 8; An aluminum conductor surrounding the center tension line; And a protective layer surrounding the outside of the aluminum conductor.

The high capacity transmission cable according to the present invention includes an optical cable that functions as a path through which an optical signal can be transmitted to an internal core, thereby analyzing the optical signal transmitted through the optical cable, thereby diagnosing the health of the high capacity transmission cable in a certain section.

Also, the high-capacity transmission cable according to the present invention can adjust the sensitivity for diagnosing an abnormality or a weak point when the number of twists per unit length of the plurality of optical fibers provided in the inner core is adjusted.

1 is an exploded perspective view schematically showing a high-capacity transmission cable according to an embodiment of the present invention.
FIG. 2 is a schematic view schematically showing the installation of a high-capacity transmission cable according to an embodiment of the present invention.
3 is a schematic cross-sectional view illustrating a view of a center tension line according to an embodiment.
Figs. 4 to 6 are schematic cross-sectional views showing a state of a center tension line according to another embodiment. Fig.

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.

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 protective layer (not shown) as a cover for protecting the outside from environmental corrosion. The 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 includes an outer core 100, an inner core 200, and an optical cable 300.

The center lines 10 will be described in detail below with reference to the respective drawings.

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.

Referring to Fig. 2, the high-capacity transmission cable 1 is installed between the electrical poles and the transmission towers 2 in such a manner that they transmit 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 Fig. 3, 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.

A core wire 10 according to the present embodiment includes an outer core 100, an inner core 200, and an optical cable 300.

The optical cable 300 includes an optical fiber 305 and a cover layer 330.

The optical fiber 305 is enclosed by the inner core 200 and functions as a path for transmitting the optical signal. Specifically, the optical fiber 305 includes an optical fiber core 310 and an optical fiber clad layer 320. The optical fiber clad layer 320 is provided so as to surround the optical fiber core 310.

The optical fiber core 310 is formed to have a relatively higher refractive index than the optical fiber clad layer 320 and the optical fiber clad layer 320 is formed to have a lower refractive index than the optical fiber core 310 to induce total internal reflection, Allowing progressive light to travel along a constant path, i.e., the optical fiber core 310, without being scattered.

It is possible to diagnose the integrity of the entire high capacity transmission cable by using the light transmitted through the optical fiber 305. For example, in the installation of the first high-capacity transmission cable, the optical signal is transmitted as a test signal prior to transmission of the actual power, and the signal is received at a remote place to compare the sensitivity of the transmission signal with the reception signal, And it is possible to diagnose whether or not the high capacity transmission cable is sound due to weather deterioration and unexpected accidents even when power is supplied using a high capacity transmission cable.

The coating layer 330 surrounds the optical fiber core 310 and the optical fiber clad layer 320 and protects the optical fiber 305 inside. The coating layer 330 can be formed as a layer for protecting the optical fiber 305 inside using an epoxy resin. The carbon fiber contained in the internal core 200 to be described later is immersed in the molten epoxy resin and is wound on the outer side of the optical fiber 305 and hardened, (200) may be formed so as to have the function of the coating layer (330) at the same time.

The inner core 200 is provided to surround the outside of the optical cable 300. The inner core 200 may be formed using carbon fiber and 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.

The inner core 200 is preferably formed using a carbon fiber and an epoxy resin, but it is also possible to form the inner core 200 in a plurality of layers in the manufacturing method. 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 inner 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.

The glass fiber or the basalt fiber may be provided in such a manner that the inner core 200 is wound in a helical shape.

An optical cable according to another embodiment will be described with reference to Figs. Figs. 4 to 6 are schematic cross-sectional views showing a state of a center tension line according to another embodiment. Fig.

4, a coating layer may be formed separately from an insulating material such as an epoxy resin. However, the coating layer 330b in this embodiment is formed of a carbon fiber and an epoxy resin As shown in FIG.

Specifically, the carbon fiber is immersed in an epoxy resin in a molten state and then wound on the outer side of the optical fiber 305 and cured to form the coating layer 330b. The surface of the coating layer 330b itself can be uniformly formed by forming the coating layer 330b using the carbon fibers before forming the internal core 200. This reduces the weight of the entire high capacity transmission cable and increases the tensile strength Effect can be obtained.

Referring to FIG. 5, the center line 10c according to the present embodiment may include a plurality of optical fibers 305. FIG. By providing a plurality of optical fibers 305, it is possible to perform an average comparison of signals, and a mismatch between excessive transmission and reception signals occurring in only one of the optical fibers 305 can be reliably diagnosed by removing it from the diagnostic process.

At this time, each of the optical fibers 305 can form a twisted structure by being wound three to seven times per meter.

As described above, each optical fiber 305 can be used for testing the integrity of the high-capacity transmission cable itself through the transmission of signals. At this time, the optical fiber 305 uses reflection of light according to the refractive index difference. When the optical fibers 305 are suddenly bent, signals transmitted along the optical fiber 305 may be lost. The plurality of optical fibers 305 according to the present embodiment may have a twisted structure in advance to increase the loss rate of the signal according to the change of the external environment, thereby increasing the sensitivity to predict the external environment change.

In the case of forming a twisted structure, if the twisted structure is less than three times per cycle (cycle), the sensitivity corresponding to such external environment can not be sufficiently obtained, and if the twisted structure has more than seven cycles per meter There is a problem in that the twist of the cable can not be properly transmitted and received, that is, the yield as a diagnosis cable is lowered.

Referring to FIG. 6, a plurality of optical fibers 305 forming a twisted structure may be provided with a separate optical fiber 305c that forms a center at the center.

The optical fiber 300 can be formed by winding the remaining optical fibers 305 in a helical shape on the center optical fiber 305 with any one of the plurality of optical fibers 305 as an axis.

In such a case, a reference reception signal is obtained from the central optical fiber 305c, and a signal obtained from the remaining optical fibers 305 is compared with the reception signal obtained from the transmission signal and the central optical fiber 305c, Can be determined.

For example, when a signal received from the optical fiber 305c at the center is compared with a transmission signal and the signal received from other optical fibers 305 is within a normal state as a result of diagnosis through comparison with the transmission signal, If the level is abnormal, it can be diagnosed that the high-capacity transmission cable is in a loose state.

In addition, various abnormal conditions can be diagnosed using signals received from the respective optical fibers 305c and 305c.

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.

10, 10b, 10c: high capacity transmission cable
100: outer core
200: internal core
300: Optical cable
310: optical fiber core
320: Optical fiber cladding
330, 330b. 330c:

Claims (10)

An inner core comprising carbon fibers;
An outer core surrounding the inner core and comprising at least one of glass fiber and basalt fiber; And
And an optical fiber provided in the inner core and having an optical fiber for transmitting an optical signal. The method according to claim 1,
The optical fiber includes:
An optical fiber core for transmitting the optical signal; And
And a central core including an optical fiber clad layer surrounding the optical fiber core. 3. The method of claim 2,
And a covering layer surrounding the optical fiber. The method of claim 3,
Wherein the coating layer is a center that is formed by winding carbon fiber on the coating layer. 3. The method of claim 2,
Wherein the inner core is a center that is formed in such a manner that the carbon fibers contained in the inner core are wound along the longitudinal direction on the outer circumferential surface of the optical cable. 3. The method of claim 2,
Wherein the optical fiber is a plurality of optical fibers. The method according to claim 6,
Wherein the plurality of optical fibers are centered to form a twist structure in a manner of being wound three to seven times per meter. The method according to claim 6,
Wherein the plurality of optical fibers are the centers of the remaining optical fibers centering on any one of the optical fibers to form a twisted structure. The method according to claim 1,
Wherein one of the glass fiber and the basalt fiber included in the outer core is a center that is wound along the longitudinal direction on the outer peripheral surface of the inner core. A center line according to any one of claims 1 to 9;
An aluminum conductor surrounding the center tension line; And
And a protective layer surrounding the outside of the aluminum conductor.

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