KR20230072941A - Tension core and overhead electric powerline comprising the same - Google Patents

Abstract

The present invention provides a tensile core and an overhead transmission line including the same. One aspect of the tensile core according to an embodiment of the present invention is a tensile core constituting an overhead power transmission line and disposed inside a conductor portion that transmits power: the tensile core includes a plurality of first fibers and the first fibers an inner core layer that includes a first resin that is impregnated and then cured, and that bears tensile force; a corrosion prevention layer disposed to surround the inner core layer and to prevent galvanic corrosion of the inner core layer due to contact with the conductor; and a heat insulating layer disposed inside the anti-corrosion layer to block heat transfer to the inner core layer. includes

Description

Tensile core and overhead transmission line including the same {TENSION CORE AND OVERHEAD ELECTRIC POWERLINE COMPRISING THE SAME}

The present invention relates to a tensile core and an overhead transmission line including the same.

An overhead transmission line is installed in a transmission tower to transmit power, and includes a tensile core that bears a tensile force and a conductor that substantially transmits power. In general, an aluminum conductor steel reinforced (ACSR) cable is used in which a tensile core made of steel is disposed so that a conductor made of aluminum surrounds it. However, in recent years, as the distance between transmission towers increases and the diameter of an overhead transmission line increases for high voltage transmission, the tensile force acting on the actual overhead transmission line increases. To solve this problem, a reinforcing fiber and resin containing An aluminum conductor composite core (ACCC) cable in which the composite core bears the tensile force is used.

Carbon fiber is mainly used in the composite core of such an aluminum conductor composite core (ACCC) cable. Carbon fiber has an advantage of having higher tensile strength than a conventional steel core, but has a relatively low heat resistance. In particular, when an overhead transmission line is disconnected due to a fire such as a forest fire, not only is the overhead transmission line damaged, but also if only one side of the overhead transmission line connected to both sides is disconnected, there is a concern that the transmission tower may be overturned due to the imbalance of the acting external force. .

Therefore, it is necessary to secure heat resistance for the tensile core in order to prevent disconnection of the overhead power transmission line apart from damage to the overhead power transmission line. Prior Patent 1 (Japanese Patent Laid-open Publication No. 2018-129291, name: heat-resistant core for electric wire) and Prior Patent 2 (Korean Patent Publication No. 2012-0018473, name: overhead wire) include various technologies for increasing the heat resistance of a tensile core. this is proposed. In the case of Prior Patent 1, the supply of oxygen to the tensile core is blocked by the core wire 11, that is, the barrier layer 15 surrounding the tensile core, thereby preventing the tensile strength of the tensile core from being lowered at a high temperature. And in Prior Patent 2, the surface of the aramid fibers constituting the core portion 110 is provided with a coating layer 111 formed by securing hydrophobicity by plasma or fluorine treatment to prevent the aramid fibers from being damaged at high temperatures.

However, the conventional tensile core and the overhead transmission line including the same have the following problems.

First, conventionally, heat transfer to the tensile core 110 is blocked by a structure such as the barrier layer 15 or the coating layer 111 . However, since the heat shielding efficiency is substantially proportional to the thickness of the barrier layer 15 or the coating layer 111, conventionally, in order to improve the heat shielding efficiency, that is, heat resistance, the barrier layer 15 or the coating layer 111 ) increases, and eventually, the diameter of the overhead transmission line may increase.

In addition, in the prior art, since components for improving heat resistance, such as the barrier layer 15 or the coating layer 111, must be added, additional work hours for forming them must be added. Therefore, in the prior art, the manufacturing process of the tensile core and the overhead transmission line becomes complicated.

Japanese Unexamined Patent Publication No. 2018-129291 (name: heat-resistant core for electric wire) Republic of Korea Patent Publication No. 2012-0018473 (Name: overhead line)

The present invention is to solve the problems caused by the prior art as described above, and an object of the present invention is to provide a tensile core configured to minimize an increase in diameter for securing heat resistance and an overhead transmission line including the same.

Another object of the present invention is to provide a tensile core configured to be manufactured more simply and an overhead transmission line including the same.

One aspect of the tensile core according to an embodiment of the present invention for achieving the above object is a tensile core disposed inside a conductor unit constituting an overhead transmission line and transmitting power: the tensile core comprises a plurality of an inner core layer that includes one fiber and a first resin that is impregnated into the first fiber and then cured, and bears a tensile force; a corrosion prevention layer disposed to surround the inner core layer and to prevent galvanic corrosion of the inner core layer due to contact with the conductor; and a heat insulating layer disposed inside the anti-corrosion layer to block heat transfer to the inner core layer. includes

In one aspect of this embodiment, the heat insulating layer includes an expandable powder mixed with the first resin and expanded at a preset temperature.

In one aspect of this embodiment, the heat insulating layer is interposed between the inner core layer and the anti-corrosion layer and is formed in the form of a veil containing expanded powder.

In one aspect of this embodiment, the expanded powder expands at a temperature of 220°C or higher.

In one aspect of this embodiment, the anti-corrosion layer includes a plurality of second fibers.

In one aspect of this embodiment, the sum of the cross-sectional areas of the second fibers is 60 to 80% of the cross-sectional area of the anti-corrosion layer.

In one aspect of this embodiment, the first fiber is a carbon fiber, and the second fiber is a glass fiber.

In one aspect of this embodiment, the anti-corrosion layer includes an anti-corrosion mat disposed to surround the inner core layer.

In one aspect of this embodiment, the anti-corrosion mat is made of a glass material or a basalt material, and is formed in a lattice shape in which a plurality of buffer openings are defined.

An aspect of an overhead power transmission line according to an embodiment of the present invention includes a tensile core according to any one of claims 1 to 3; and a conductor part that is disposed to surround the tensile core and transmits electric power. includes

According to the tensile core and the overhead transmission line including the same according to the embodiment of the present invention, the following effects can be expected.

First, in the embodiment of the present invention, only when the external temperature of the overhead power transmission line increases to a predetermined temperature due to an actual fire or the like, the expandable powder constituting the heat insulating layer expands to block heat transfer from the outside to the tensile core. Therefore, according to an embodiment of the present invention, it is possible to secure the heat resistance of the tensile core while minimizing the increase in the diameter of the tensile core and eventually the diameter of the overhead transmission line.

In addition, in the embodiment of the present invention, the expanded powder is mixed with the resin forming the tensile core layer or mixed with the resin impregnated into a separate substrate. In particular, when the expanded powder is mixed with the resin forming the tensile core layer In this case, the heat insulating layer can be formed only by adding a simple process of mixing the expanded powder with the resin. Therefore, according to the embodiments of the present invention, it is possible to more simply manufacture a tensile core and an overhead power transmission line ensuring heat resistance.

1 is a perspective view showing an overhead power transmission line according to a first embodiment of the present invention;
2 is a perspective view showing an overhead transmission line according to a second embodiment of the present invention;
3 is a perspective view showing an overhead transmission line according to a third embodiment of the present invention;

Hereinafter, an overhead power transmission line according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an overhead power transmission line according to a first embodiment of the present invention.

Referring to FIG. 1 , an overhead power transmission line 1 according to this embodiment includes a tensile core 101 and a conductor portion 200 . The tensile core 101 bears tensile force, and the conductor portion 200 transmits electric power.

More specifically, the tensile core 101 includes an inner core layer 110 , an anti-corrosion layer 121 and a heat insulating layer 131 . The inner core layer 110 substantially bears the tensile force acting on the overhead power transmission line 1, and the corrosion prevention layer 121 prevents corrosion of the inner core layer 110. In addition, the heat insulating layer 131 blocks heat transfer to the inner core layer 110 .

The inner core layer 110 includes a plurality of first fibers 110F and a first resin that is impregnated into the first fibers 110F and then cured. A carbon fiber may be used as the first fiber 110F, and a thermosetting resin such as an epoxy resin may be used as the first resin. When the first resin is cured in a state in which the first fibers 110F impregnated with the first resin are bundled, the inner core layer 110 may be formed.

The anti-corrosion layer 121 is disposed to surround the inner core layer 110 and prevents galvanic corrosion of the inner core layer 110 due to contact with the conductor part 200 . In this embodiment, the anti-corrosion layer 121 includes a plurality of second fibers 121F. Glass fiber may be used as the second fiber 121F, and the second fiber 121F is formed by curing the first resin impregnated in the first fiber 110F to form the first fiber 110F. As a result, the anti-corrosion layer 121 may be formed at the same time as the inner core layer 110 is formed. In another example, the second resin is separately impregnated into the second fiber 121F, and the second resin is cured simultaneously with or after the first resin is cured to form the anti-corrosion layer 121. can be formed. As the second resin, in the same way as the first resin, an epoxy resin or the like may be used.

In particular, in this embodiment, the sum of the cross-sectional areas of the second fibers 121F is set to 60 to 80% of the cross-sectional area of the anti-corrosion layer 121. This, as will be described later, prevents corrosion of the inner core layer 110 by the corrosion prevention layer 121 and at the same time, the corrosion prevention layer 121 partially absorbs the increase in volume when the heat insulation layer 131 expands. is to do That is, since the inner core layer 110 substantially bears the tensile force of the overhead power transmission line 1, even if the corrosion protection layer 121 is damaged and the second fiber 121F is substantially disconnected, the overhead power transmission line Although the tensile force of (1) can be secured, this is to prevent additional damage that may occur when the anti-corrosion layer 121 is damaged and detached from the tensile core 101.

Next, the heat insulating layer 131 is disposed inside the anti-corrosion layer 121 and expands at a predetermined temperature to block heat transfer to the inner core layer 110 . In this embodiment, the heat insulating layer 131 includes an expanding powder 131P that expands at a preset temperature. Substantially, the expanded powder 131P is mixed with the first resin before being impregnated into the first fiber 110F. For example, as the expanded powder 131P, expanded graphite powder that expands at a temperature of 220° C. or higher may be used.

Meanwhile, the conductor portion 200 is disposed to surround the tensile core 101 and substantially transmits power. The conductor part 200 may be formed of aluminum or an aluminum alloy material, and the conductor part 200, which is a plurality of aluminum or aluminum alloy strands having a rectangular or trapezoidal cross section, for example, may be one layer or two One or more layers may surround the tensile core 101 .

In the present embodiment configured as described above, the heat insulating layer 131 expands at a predetermined temperature to block heat transfer to the inner core layer 110 . Therefore, according to the present embodiment, the increase in the cross-sectional size of the inner core layer 110, substantially the overhead power transmission line 1, is minimized while the heat resistance of the inner core layer 110, that is, the overhead power transmission line 1 is improved. be able to secure

Further, in this embodiment, the first fibers 110F are impregnated into the first resin in a state where the expanded powder 131P forming the heat insulating layer 131 is mixed with the first resin. Therefore, according to this embodiment, it is possible to more simply secure the heat resistance of the tensile core 101 .

Hereinafter, an overhead power transmission line according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view showing an overhead power transmission line according to a second embodiment of the present invention. Among the components of the present embodiment, reference numerals in FIG. 1 are used for components identical to those of the first embodiment of the present invention described above, and detailed description thereof will be omitted.

Referring to FIG. 2 , in the overhead power transmission line 2 according to this embodiment, the heat insulation layer 132 includes an expandable member 132M. The expandable member 132M is interposed between the inner core layer 110 and the anti-corrosion layer 121, and is formed in the form of a veil containing expandable powder to define the expandable member 132M. there is. Here, as the expanded powder, as in the first embodiment of the present invention, expanded graphite powder may be used.

In the heat insulating layer 131, in a state where the expandable member 132M surrounds the first fibers 110F forming the inner core layer 110, the first resin impregnated into the first fibers 110F is cured. By doing so, it can be formed. Alternatively, the heat insulating layer 131 is formed by curing the third resin simultaneously with or after curing of the first resin in a state in which the expandable member 132M is separately impregnated with the third resin, can be formed As the third resin, like the first resin and/or the second resin, a thermosetting resin such as an epoxy resin may be used.

Hereinafter, an overhead power transmission line according to a third embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing an overhead power transmission line according to a third embodiment of the present invention. Among the components of the present embodiment, reference numerals in FIG. 1 are used for components identical to those of the first embodiment of the present invention described above, and detailed description thereof will be omitted.

Referring to FIG. 3 , in the overhead power transmission line 3 according to the present embodiment, the anti-corrosion layer 122 includes an anti-corrosion mat 122M. The anti-corrosion mat 122M is disposed to surround the inner core layer 110 , substantially, the first fibers 110F forming the inner core layer 110 . The anti-corrosion layer 121 is formed by curing the first resin impregnated into the first fibers 110F in a state where the anti-corrosion mat 122M surrounds the first fibers 110F, or the anti-corrosion layer 121 The anti-mat 122M may be formed by curing the second resin at the same time as or after curing of the first resin in a state in which the second resin is impregnated separately.

In this embodiment, the anti-corrosion mat 122M is made of glass or basalt. In particular, the anti-corrosion mat 122M is formed in a grid shape in which a plurality of buffer openings 122M' are defined. As such, the buffer opening 122M' performs a buffer function when the heat insulating layer 131 expands.

Also, in this embodiment, the heat insulating layer 131 may be configured the same as that of the first embodiment of the present invention described above. Of course, the heat insulating layer 131 of this embodiment may be configured identically to the heat insulating layer 132 of the second embodiment of the present invention.

Within the scope of the basic technical idea of the present invention, many other modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. will be.

1, 2, 3: overhead transmission line 101, 102, 103: tensile core
110: inner core layer 121, 122: corrosion protection layer
131, 132: heat insulation layer 200: conductor layer

Claims (10)

In the tensile core 101, 102, 103 constituting the overhead power transmission line 1 and 2 and disposed inside the conductor portion 200 that transmits power:
The tensile cores 101, 102, and 103,
an inner core layer 110 including a plurality of first fibers 110F and a first resin impregnated into the first fibers 110F and then cured, and bearing a tensile force;
Corrosion prevention layers 121 and 122 disposed to surround the inner core layer 110 and prevent galvanic corrosion of the inner core layer 110 due to contact with the conductor part 200; and
heat insulating layers 131 and 132 disposed inside the anti-corrosion layers 121 and 122 and blocking heat transfer to the inner core layer 110; Tensile core comprising a.
According to claim 1,
The heat insulating layer 131 includes an expandable powder 131P mixed with the first resin and expanded at a preset temperature.
According to claim 1,
The heat insulating layer 132 is interposed between the inner core layer 110 and the anti-corrosion layers 121 and 122, and includes an expandable member 132M formed in the form of a veil containing expandable powder. core.
According to claim 2 or 3,
The expanded powder 131P is an expanded graphite powder that expands at a temperature of 220° C. or higher.
According to claim 2 or 3,
The anti-corrosion layer 121 includes a plurality of second fibers 121F.
According to claim 5,
The tensile core, wherein the sum of the cross-sectional areas of the second fibers (121F) is 60 to 80% of the cross-sectional area of the anti-corrosion layer (121).
According to claim 6,
The first fiber 110F is a carbon fiber,
The second fibers 121F are glass fibers.
According to claim 2 or 3,
The anti-corrosion layer 122,
A tensile core including a corrosion-resistant mat (122M) disposed to surround the inner core layer (110).
According to claim 8,
The anti-corrosion mat 122M is made of glass or basalt, and is formed in a lattice shape in which a plurality of buffer openings 122M' are defined.
The tensile core (101) (102) (103) according to any one of claims 1 to 3; and
a conductor part 200 disposed to surround the tensile cores 101, 102, and 103 and transmitting electric power; An overhead transmission line containing an.

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