WO2021210940A1 - Conductor for cable, method for manufacturing same, and cable comprising conductor manufactured thereby - Google Patents

Abstract

The present invention relates to a conductor for a cable, a method for manufacturing the same, and a cable including the conductor manufactured thereby, in which reliability of conduction is enhanced by minimizing disconnection of wires caused by twisting. The conductor for a cable according to the present invention can greatly reduce the disconnection rate of the conductor by improving resistance to twisting, and thus can be suitably utilized for a conductor, for example, a wind power cable, which can be used in a severe environment such as a case in which twisting is severe, and can satisfy a resistance criterion required for the conductor even when the use of the conductor is reduced.

Description

Conductor for cable, method for manufacturing same, and cable comprising conductor manufactured therefrom

The present invention relates to a conductor for a cable, a method for manufacturing the same, and a cable comprising the conductor manufactured therefrom. More specifically, the present invention relates to a conductor for a cable having improved energization reliability by minimizing disconnection of a strand due to torsion, a method for manufacturing the same, and a cable including the conductor manufactured therefrom.

Recently, as the depletion of existing energy resources such as oil and coal is predicted, interest in alternative energy to replace them is increasing. Among them, wind power generation, which converts the kinetic energy of wind into electrical energy, does not have problems with resource depletion or environmental pollution, and is particularly attracting attention due to its good economic feasibility compared to other renewable energies. Wind power accounts for 67.2% of global renewable energy generation (as of 2006). Accordingly, the generation capacity of the wind power generator is also increasing in size from 1,000KW to 2,000KW.

In the wind power generator, a power generation unit including a windmill, a rotational force transmitting mechanism, a generator, and the like, is rotatably installed around the tower at the top of the tower. A cable for power transmission is installed in the power generation unit, and as the power generation unit rotates left and right, the cable is also twisted at a large angle. In general, the torsion angle reaches a maximum of ±540 degrees.

In addition, in the case of high-voltage cables for wind power generation, they are applied to wind power generators of 1MW class or higher. High voltages of 15 kV or more are added to the transmission and distribution wires to prevent high-voltage discharge and breakdown of the withstand voltage of the cable insulation layer. A metal shielding layer is used.

A typical power cable or wind power cable has a configuration in which a conductor, a binding tape, an insulating layer, and a sheath are sequentially stacked on the conductor at the center. The conductor is made of a metal material such as copper or aluminum and an aluminum alloy. Binding tapes, insulation and sheaths are also made of plastic materials such as XLPE or PVC. In general, permanent deformation of a material due to torsion in a room temperature atmosphere occurs more frequently in metal than in plastic. In fact, the most vulnerable part of a cable to torsion is the conductor part.

In order to solve this problem, an aggregate wire or a composite wire obtained by twisting the aggregate wire once more was used to be more advantageous for flexibility and torsion characteristics. It is known that when a conductor with a diameter of 0.51 mm or less is assembled/composited and manufactured, the flexibility and torsional characteristics are superior to that of a distribution conductor, which is a general aggregated wire known as a circular stranded conductor.

The conventional assembly wire is manufactured by braiding an arbitrary number of wires in one direction to satisfy the resistance of the final product in a form having an appropriate pitch to satisfy the resistance, flexibility, and torsion characteristics of the final product.

The composite wire may be manufactured by twisting the aggregate wire in a predetermined direction according to a predetermined pitch. Unlike aggregation lines, a composite line forms a layer-by-layer structure like a stranded line structure. This laminated structure is designed so that the cross section of the conductor is formed close to a circular shape. In general, a 7-stranded composite wire is manufactured by twisting 6 aggregate wires around one central conductor. For example, when manufacturing a 3-layer composite conductor, it should consist of 1 center conductor, +6 1-layer conductors, +12 2-layer conductors, and +18 3-layer conductors.

Such a composite conductor structure has a higher torsional resistance than a conductor having a circular stranded wire or a circular compressed stranded wire structure, but as the usage time increases, the central conductor becomes weak from torsional stress, and the conductor breaks around the center line and the first-layer conductor. And, as a result, there arises a problem that the resistance of the conductor is not satisfied.

In addition, as a method of further improving the torsional characteristics, a method of designing a short jib/composite pitch was considered. However, these measures also have structural limitations in remarkably improving the disconnection rate of the central conductor, and the shorter the collection/composite pitch of the conductor, the longer the current flows, the greater the resistance per unit length. There is a problem that must be used.

[Prior art literature]

[Patent Literature]

Patent Document 1: Korean Patent Publication No. 10-2011-0061205

The technical problem to be solved by the present invention is a conductor for a cable, a method for manufacturing the same, and a method for manufacturing the same, which suppress torsional disconnection to ensure the reliability of a product in an environment where a torsional load is applied continuously and periodically, such as a wind power generation facility An object of the present invention is to provide a cable including a manufactured conductor.

As a means for solving the above technical problem,

The present invention provides a conductor for a cable including a conductor, the conductor comprising: a central conductor including an aggregated wire provided by twisting a plurality of strands; and at least one outer conductor layer provided to surround the outer periphery of the central conductor, wherein the conductor satisfies all of Equations 1 to 3 below.

[Formula 1]

[Formula 2]

[Equation 3]

In Equations 1 to 3, D _f is the relative outer diameter ratio (%) of the conductor, D2 is the conductor outer diameter (mm) after compression of the conductor, D1 is the minimum conductor outer diameter (mm) of the conductor, d _w is the wire diameter (mm), which is the diameter of one wire included in the conductor, and n _total means the total number of wires included in the conductor.

In addition, the present invention provides a conductor for cables, wherein the center conductor includes a composite wire in which two or more of the aggregated wires are twisted to form a single layer.

In addition, the present invention provides a conductor for a cable, characterized in that the composite wire is provided in one layer by twisting three or four of the aggregate wire.

In addition, the present invention provides a conductor for cables, characterized in that the aggregated wire is provided by twisting 7 or more to 72 or less strands.

In addition, the present invention is characterized in that the outer conductor layer includes an aggregated wire provided by twisting 7 or more to 72 or less stranded wires and a composite wire provided as a single layer by twisting two or more of the aggregated wires. To provide a conductor for cables.

In addition, the present invention provides a conductor for cables, characterized in that the pitch ratio of the assembly line is 8 to 18 times, and the pitch ratio of the composite wire of the outermost outer conductor layer is 16 to 36 times.

Moreover, this invention provides the conductor for cables, The pitch value of the said assembly line is 4 mm or more - 90 mm or less, characterized by the above-mentioned.

Moreover, this invention provides the conductor for cables, The pitch value of the said composite wire is 16 mm or more - 540 mm or less, It characterized by the above-mentioned.

In addition, the present invention provides a conductor for a cable, characterized in that the element wire is at least one selected from the group consisting of copper, tin-plated copper, aluminum, copper alloy and aluminum alloy.

Moreover, this invention provides the conductor for cables, characterized in that the wire diameter (mm) which is the diameter of the said wire is less than 0.6 mm.

In addition, the present invention, the above-mentioned conductor for cable; an insulating layer insulating the conductor; And it provides a cable including a sheath layer for protecting the internal configuration on the outside of the insulating layer.

In addition, the present invention provides a first step of manufacturing a center conductor by twisting 7 or more to 72 or less strands to form an aggregated wire; a second step of forming one or more outer conductor layers provided to surround the outer periphery of the central conductor; and a third step of manufacturing a conductor by passing the center conductor and the outer conductor layer through a die and compressing the conductor, wherein the conductor satisfies the following Equations 1 to 3 A method for manufacturing a conductor is provided.

[Formula 1]

[Formula 2]

[Equation 3]

In Equations 1 to 3, D _f is the relative outer diameter ratio (%) of the conductor, D2 is the conductor outer diameter (mm) after compression of the conductor, D1 is the minimum conductor outer diameter (mm) of the conductor, d _w is the wire diameter (mm), which is one diameter of the wire twisted in the aggregated wire included in the conductor, and n _{total means the total number} of wires included in the conductor.

In addition, the present invention provides a method for manufacturing a conductor for a cable, characterized in that the central conductor formed in the first step includes a composite wire in which two or more of the aggregate wires are twisted to form a single layer. .

In addition, the present invention provides a method for manufacturing a conductor for a cable, characterized in that, in the case of the composite wire, three or four of the aggregate wire are twisted and provided as one layer.

In addition, the present invention is characterized in that the outer conductor layer includes an aggregated wire provided by twisting 7 or more to 72 or less stranded wires and a composite wire provided as a single layer by twisting two or more of the aggregated wires. It provides a method for manufacturing a conductor for cables.

In addition, the present invention provides a method for manufacturing a conductor for a cable, characterized in that the pitch ratio of the assembly line is 8 to 18 times, and the pitch ratio of the composite wire of the outermost outer conductor layer is 16 to 36 times.

Since the conductor for cable according to the present invention can greatly improve the disconnection rate of the conductor through improvement in resistance to torsion, it can be suitably used for a conductor that can be used in harsh environments such as when twisting is severe, for example, a wind power cable. can

In addition, the conductor for cables according to the present invention can satisfy the resistance standard required as a conductor even if the amount of the conductor is reduced.

The accompanying drawings are intended to explain the contents of the present invention in more detail to those skilled in the art, but the technical spirit of the present invention is not limited thereto.

1 is a diagram for explaining the concept of "pitch ratio" used in the present invention.

2 is a diagram showing a schematic diagram of an exemplary conductor in connection with the present invention.

3 is a flowchart of a method of manufacturing a conductor for a cable according to an embodiment of the present invention.

4 to 6 are views showing observation photographs of a conductor for cables according to a comparative example of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The description below is only for specifying the embodiments, and is not intended to limit or limit the scope of rights according to the present invention. What a person of ordinary skill in the art related to the present invention can easily infer from the detailed description and embodiments of the invention should be construed as belonging to the scope of the present invention.

Although the terms used in the present invention have been described as general terms widely used in the technical field related to the present invention, the meaning of the terms used in the present invention is the intention of a technician in the relevant field, the emergence of new technology, examination standards or precedents. It may vary depending on Some terms may be arbitrarily selected by the applicant, and in this case, the meaning of the arbitrarily selected terms will be described in detail. Terms used in the present invention should be interpreted as meanings reflecting the overall context of the specification, not just dictionary meanings.

Terms such as 'consisting of' or 'comprising' used in the present invention should not be construed as necessarily including all of the components or steps described in the specification, and if some components or steps are not included, And when additional components or steps are further included, it should also be construed as intended from the term.

Terms including an ordinal number such as 'first' or 'second' used in the present invention may be used to describe various components or steps, but the components or steps should not be limited by the ordinal number. . Terms containing an ordinal number should only be construed for the purpose of distinguishing one element or step from other elements or steps.

Hereinafter, the present invention will be described in detail.

The present invention relates to conductors. Specifically, the present invention relates to a conductor for a cable comprising a conductor, and more particularly the present invention relates to a conductor for a cable comprising a center conductor.

In one example, the conductor may include a central conductor including an aggregate wire provided by twisting 7 or more to 72 or less strands and a composite wire provided as one layer by twisting two or more of the aggregated wire. have.

At least one selected from the group consisting of copper, tin-plated copper, aluminum, a copper alloy, and an aluminum alloy may be used as the element wire, but is not particularly limited thereto.

The diameter of the wire, that is, the wire diameter, may be appropriately selected and applied within the range of less than 0.6 mm, preferably 0.51 mm or less. A small wire diameter can be selected within an appropriate range in consideration of factors such as the bow. However, when the wire diameter exceeds 0.51 mm, the difference in torsional resistance between the outside and the inside is large, so that cracks are easy to occur, and there is a problem that disconnection can easily occur.

In the case of the assembly line, as described above, the strands may be twisted, and in this case, the strands may be 7 or more to 72 or less strands. Thus, resistance to torsion can be improved. However, when the number of the wires is less than 7 or more than 72, the resistance to torsion is not improved, and thus a problem in that the disconnection rate of the conductor is increased may occur.

In the case of the assembly line, the twisting direction of the strand may be, for example, the S direction or the Z direction.

The pitch value of the aggregation line may be 4 mm or more and 90 mm or less.

As used herein, the term "pitch value" means that when an element included in the aggregate or composite wire is twisted along the center of a conductor, it is placed on the same angular line in an arbitrary section according to the twisting direction of the wire. Means the distance interval from the first position.

When the pitch value of the aggregation line is within the above-mentioned range, the disconnection rate of the cable including it can be reduced due to improved resistance to torsion of the conductor. If it is less than 4 mm or more than 90 mm, it is difficult to improve the torsion resistance of the conductor, and consequently, the disconnection rate of the cable including the same may be increased.

In the case of the composite wire, as described above, two or more aggregate wires may be twisted to form a single layer.

In the case of a composite wire in which two or more of the aggregated wires are twisted to form a single layer, the twisting direction of the aggregated wire may be, for example, the S direction or the Z direction, and the twisting direction of the strands constituting the aggregated wire is may be the same, but is not particularly limited thereto.

When two or more of the aggregate wires are twisted and a composite wire provided in the form of one layer is applied as a center conductor, the twist angle can be lowered, and thus the overall disconnection rate of the cable can be lowered by improving resistance to twisting.

In one example, the composite wire may have a form in which three or four aggregate wires are twisted to form a single layer.

The conductor according to the present invention may include a composite wire in which three or four aggregated wires are twisted as described above, instead of using a conventional one centerline or one aggregated wire as a center conductor, in this case, one centerline Alternatively, the twist angle may be lowered by including the composite wire in the center conductor instead of one aggregate wire, thereby improving resistance to torsion and further improving the disconnection rate of the entire cable.

The pitch value of the composite wire may be 16 mm or more and 540 mm or less.

The definition of the "pitch value" is, when the assembly line included in the composite wire is twisted along the center of the conductor, the distance from the first position lying on the same angular line in an arbitrary section according to the twisting direction of the assembly line means the interval.

When the pitch value of the composite wire is in the above-mentioned range, due to improved resistance to torsion of the conductor, the disconnection rate of the cable including the same can be reduced, and if the pitch value of the composite wire is out of the aforementioned range, for example If it is less than 16 mm or more than 540 mm, it is difficult to improve the torsion resistance of the conductor, and consequently, the disconnection rate of the cable including the same may be increased.

The conductor according to the present invention may include one or more external conductor layers provided to surround the outer periphery of the central conductor.

In one example, the outer conductor layer is provided as a single layer by twisting at least 7 to 72 strands and twisting two or more of the conductors independently of the conductor and the center conductor, respectively. It may contain compound lines.

The conductor according to the present invention includes one or more external conductor layers provided to surround the outer periphery of the central conductor, thereby minimizing the disconnection rate of the entire cable.

Here, the outer conductor layer may be one or more layers, and may include, for example, a first outer conductor layer and a second outer conductor layer.

The first outer conductor layer may include 6, 9, or 11 assembly lines forming a circular shape on the outer periphery of the central conductor.

In addition, the second outer conductor layer may be provided with 12 or 15 aggregated lines forming a circular shape on the outer periphery of the first outer conductor layer.

In one example, the pitch ratio of the composite wire of the outermost outer conductive layer among the external conductive layers may be greater than or equal to the pitch ratio of the assembly line.

1 is a diagram for explaining the concept of "pitch ratio" used in the present invention.

As used herein, the term “pitch ratio” may be calculated by the following relational expression.

[Relational Expression]

Referring to the above relational expression, the "pitch ratio" may mean a pitch value (mm) with respect to a floor core diameter (mm). Here, in the case of an aggregation line, the term "center diameter" means the diameter of an imaginary circle connecting the centers of the element wires disposed on the outermost layer of the assembly line, and in the case of a composite line, a virtual circle connecting the centers of the assembly lines disposed on the outermost layer of the composite line is the diameter of the circle of Therefore, the "composite line pitch ratio" to be described later can be calculated as the aggregate pitch value (mm) with respect to the aggregate line core diameter (mm), and the "composite line pitch ratio" is the composite pitch with respect to the composite wire layer core diameter (mm). It can be calculated as a value (mm). In addition, when the conductor forms a plurality of layers, the "composite pitch ratio" of the corresponding layer can be calculated as a composite pitch value (mm) with respect to the core diameter (mm) of the composite wire of the first layer in the case of one layer, , in the case of two layers, it can be calculated as a composite pitch value (mm) for the layer core diameter (mm) of the composite wire of the second layer.

In this regard, since the prior art adopts a design method to increase the flexibility of the conductor in order to increase the torsion characteristics, a conductor with a short pitch ratio has high flexibility. However, this application has a problem in that it is inevitable to increase the manufacturing cost due to an increase in the weight of the conductor and, accordingly, an increase in the outer diameter of the conductor, since it is necessary to make a product with a structure with a weight structure that is more than necessary in order to satisfy the required resistance, and additionally, a short pitch There was a problem in that the critical level was not clear, so it was difficult to adequately respond to the design requirements for the product.

Therefore, the present inventors appropriately designed and applied the pitch ratio of the aggregated wire and the composite wire included in the conductor, that is, the aggregated pitch ratio and the composite pitch ratio, rather than the flexibility of the conductor, as a way to secure the torsion resistance, preferably confirms that, when the pitch ratio of the composite wire of the outermost conductive layer among the external conductor layers is greater than or equal to the pitch ratio of the aggregate wire, the amount of conductor that satisfies the required resistance can be reduced and a more compact conductor structure design is possible. did.

In addition, when used in an environment where a lot of torsion occurs, such as a wind power cable, the pitch ratio of the composite wire of the outermost outer conductor layer is preferably the pitch ratio of the composite wire of the outermost outer conductor layer when the conductor is tightened and loosened in the clockwise or counterclockwise direction by the torsion action. It was confirmed that conductors longer than or equal to the pitch ratio showed less interference by layer.

In the conductor according to the present invention, it is preferable that the pitch ratio of the composite wire of the outermost outer conductive layer among the outer conductive layers is greater than or equal to the pitch ratio of the aggregated wire, and in one example, it is included in the outermost outer conductive layer among the outer conductive layers. The pitch ratio of the aggregated wire may be 8 to 18 times, and the pitch ratio of the composite wire included in the outermost outer conductor layer may be 16 to 36 times.

If the pitch ratio of the aggregation line included in the outermost outer conductor layer among the outer conductor layers is out of the aforementioned range, that is, from 8 times to 18 times, for example, less than 8 times and more than 18 times, and When the pitch ratio of the composite wire included in the outer outer conductor layer is out of the range of 16 to 36 times, for example, less than 16 times and more than 36 times, it is not possible to reduce the amount of conductor that satisfies the required resistance. Since there is no conductor structure, it is difficult to improve torsion resistance, so there is a problem in that the disconnection rate is also increased.

2 is a diagram showing a schematic diagram of an exemplary conductor in connection with the present invention.

Referring to FIG. 2 , in one example, when the conductor includes a plurality of layers, the required resistance value due to the interference of the conductors for each layer may vary.

Therefore, the conductor according to the present invention is designed in consideration of the relative ratio of the outer diameter of the conductor in addition to the factors that can affect the interference of the layer-by-layer conductor, that is, the above-mentioned aggregate line pitch ratio and composite line pitch ratio.

As used herein, the term "relative outer diameter ratio" means the ratio of the "outer diameter after compression" of the conductor to the "minimum conductor outer diameter" of the conductor. Here, "minimum conductor outer diameter" means an ideal minimum outer diameter of a conductor that can be formed by _{n total} wires having a diameter of _{d w .} That is, the conductor in the state of the minimum outer diameter has the maximum space factor as in the case _{where n total strands form one aggregate line.}

In one example, the conductor according to the present invention may satisfy all of Equations 1 to 3 below.

[Formula 1]

[Formula 2]

[Equation 3]

In Equations 1 to 3, D _f is the relative outer diameter ratio (%) of the conductor, D2 is the conductor outer diameter (mm) after compression of the conductor, D1 is the minimum conductor outer diameter (mm) of the conductor, d _w is the wire diameter (mm), which is the diameter of one wire included in the conductor, and n _total means the total number of wires included in the conductor.

In this regard, when a cable (especially a wind cable) is placed in an environment with severe torsion, the force received by the conductor may be various stressful external forces on the wire rod in the form of shear stress and tensile/compressive stress, for example, When twisted in the clockwise direction, the aggregated wire twisted in the S direction is twisted in the direction in which the pitch of the wire is shortened, and at this time, it receives compressive stress in the longitudinal direction of the wire, and the aggregated wire forming the single-layer composite conductor included It is tightened toward the center of the cable and presses the center conductor.

At this time, when the outer diameter relative ratio, which is the ratio of the actual conductor outer diameter after compression to the minimum conductor outer diameter, is formed in the range of 104% to 117%, the torsion resistance is strengthened throughout the conductor, thereby suppressing the occurrence of disconnection of the wire. .

Specifically, _{when the outer diameter of the conductor is large after compression due to insufficient compression of the conductor, such as when D f} exceeds 117%, that is, when an outer diameter exceeding a specific relative value compared to the minimum conductor outer diameter is secured (with less compression) As the interlayer space becomes relatively free, as described above, when the conductors are tightened in the center direction, friction between conductors occurs. This becomes poor, and it reacts with oxygen inside the cable to promote oxidation. As a result of these phenomena, the cross-sectional area of the top part is reduced and the stress is concentrated. During the torsion test, the upper end of the cable receives more stress due to the cable's own weight. lead to results In addition, this phenomenon occurs especially in the center conductor damaged by the relationship between the center conductor and the first-layer conductor.

In addition, _{when the conductor outer diameter is small after compression because the compression of the conductor is larger than necessary, such as when D f} is less than 104%, that is, when the outer diameter relative ratio is less than a specific relative value, the compression is excessive, so that the difference from the minimum conductor outer diameter is In a few cases, there is a possibility that some of the wire rods may be locally compressed while passing through the straightening dies in the production process. In this case, the load on the conductor during the torsion operation is concentrated on the boundary between the portion where the compressive deformation occurs and the top, and the breakage rate due to breakage may increase. Moreover, if the compressibility of the conductor is large, the flexibility of the conductor is lowered, so the torsion resistance throughout the conductor tends to be lowered, so that a disconnection occurs in a part other than the center conductor at the top of the cable that receives its own weight, such as when the compressibility is not sufficient. Occasionally it may happen.

Therefore, in the case of the conductor according to the present invention, as described above, by satisfying all of the above Equations 1 to 3, the disconnection rate of the conductor can be greatly improved through the improvement of resistance to torsion, so the severe environment such as severe torsion Conductors that can be used, for example, can be suitably utilized for wind power cables.

The invention also relates to a cable.

More particularly, the present invention relates to a cable comprising a conductor for a cable as described above.

In the case of the conductor for a cable, the same configuration and description as the conductor for a cable according to the present invention described above may be applied and the same may be applied as long as they do not contradict each other, and thus overlapping description will be omitted. In addition, with the exception of the cable conductor according to the present invention, the description of a general cable may be applied to the cable.

In one example, the cable comprises: a conductor for the aforementioned cable; an insulating layer insulating the conductor; and a sheath layer on the outside of the insulating layer to protect an internal configuration.

The insulating layer is not particularly limited, but may be made of, for example, a polymer resin layer, polyethylene (PE), polyurethane (PU), polystyrene (PS), polyolefin (PO), polyvinyl chloride (PVC), It may include at least one resin selected from the group consisting of polycarbonate (PC) and ethylene propylene rubber (EPR).

The insulating layer can be applied to the composition, physical properties and thickness of the insulating layer that can be included in a general cable as long as it does not affect the composition, structure, or physical properties of the conductor for cables in the present invention, as described above, and the like, It is not particularly limited.

The sheath layer may be included in the outermost shell to minimize the transmission of external impact to the above-mentioned central conductor, and in this case, it may be prescribed and applied as a composition capable of increasing the mechanical strength of the sheath layer, or of the sheath layer. It can be included in a way that is applied by adjusting the thickness.

As described above, the sheath layer can also be applied to the composition, physical properties and thickness of the sheath layer that can be included in a general cable as long as it does not affect and deform the composition, structure or physical properties of the conductor for cables in the present invention, It is not particularly limited.

The cable may further include a binding tape between the conductor for the cable and an insulating layer that insulates the conductor.

When the binding tape is included, the adhesion between the central conductor and the insulating layer can be improved, and since the tensile strength and elastic modulus inside the cable can be affected, the torsion resistance can be further improved, thereby increasing the disconnection rate.

In addition, if necessary, the cable according to the present invention includes an inner semiconducting layer provided to surround the outer periphery of the conductor, an outer semiconducting layer provided to surround the outer periphery of the insulating layer, and a metal shielding layer provided to surround the outer periphery of the outer semiconducting layer It may include, but is not limited to the above configuration, and the conductor included in the cable includes a center conductor including an aggregated wire provided by twisting 7 or more to 72 or less of the strands according to an embodiment of the present invention. and one or more external conductor layers provided to surround the outer periphery of the central conductor, and as long as all of the following Equations 1 to 3 are satisfied, the configuration of other cables may be included as it is or by modifying it.

[Formula 1]

[Formula 2]

[Equation 3]

In Equations 1 to 3, D _f is the relative outer diameter ratio (%) of the conductor, D2 is the conductor outer diameter (mm) after compression of the conductor, D1 is the minimum conductor outer diameter (mm) of the conductor, d _w is the diameter (mm) of one element included in the conductor, and n _{total is the total number} of elements included in the central conductor. Here, D2 means a value obtained by measuring the outer diameter of the conductor at an angle of 45 degrees four times after compression and averaging the measured results. On the other hand, d _w means a value obtained by taking five non-deformed wires, measuring them at an angle of 45 degrees for each wire four times, and averaging the measured results. However, since there may be errors in the measurement, the weight of 1 m of undeformed wire can be measured and the outer diameter of one wire can be calculated using the specific gravity of the wire.

The present invention also relates to a method for producing a conductor.

More specifically, the present invention relates to a method for producing the conductor for a cable described above.

The method for manufacturing the conductor for a cable according to the present invention relates to a method for manufacturing the conductor for a cable according to the present invention described above. is omitted below.

3 is a flowchart of a method of manufacturing a conductor for a cable according to an embodiment of the present invention.

Referring to FIG. 3 , the method 10 for manufacturing a conductor for a cable according to the present invention comprises: a first step (S100) of manufacturing a center conductor by twisting 7 or more to 72 or less strands to form an aggregated line; a second step (S200) of forming one or more outer conductor layers provided to surround the outer periphery of the central conductor; and a third step (S300) of manufacturing the conductor by passing the center conductor and the outer conductor layer through a die and compressing it.

The aggregation line, the composite line and the center conductor may be equally applied as long as they do not contradict each other with the descriptions mentioned in the above-mentioned conductors for cables.

The central conductor formed in the first step may include a composite wire in which two or more of the aggregated wires are twisted to form a single layer, and the composite wire, more preferably, includes three or four aggregated wires. Twisted may be provided as one layer.

In addition, the outer conductor layer formed in the second step may include an aggregate wire in which 7 or more and 72 or less strands are twisted and a composite wire in which two or more of the aggregated wires are twisted to form a single layer. .

In addition, the pitch ratio of the composite wire of the outermost outer conductive layer among the external conductive layers may be greater than or equal to the pitch ratio of the aggregate wire.

In the method for manufacturing a conductor for a cable according to the present invention, the pitch ratio of the composite wire of the outermost conductor layer among the external conductor layers is formed to be longer than or equal to the pitch ratio of the assembly line, so that the aggregate line included in the conductor is more flexible than the conductor. And by relatively controlling the pitch ratio of the composite wire, it is possible to reduce the amount of conductor that satisfies the required resistance, so that a more compact conductor structure design can be realized, and by minimizing the layer-by-layer interference of the conductor, the disconnection rate of the entire cable can be minimized. have.

In addition, since the conductor for cable manufactured by the method for manufacturing a conductor for cable according to the present invention satisfies the above-mentioned Equations 1 to 3, the disconnection rate of the conductor can be greatly improved through improvement of resistance to torsion. It can be suitably used for conductors that can be used in harsh environments such as severe cases, for example, wind power cables.

Hereinafter, examples will be given to describe the present invention in detail. However, the embodiments according to the present invention may be modified in various other forms, and the scope of the present invention is not to be construed as being limited to the embodiments described below. The embodiments of the present specification are provided to more completely explain the present invention to those of ordinary skill in the art.

Experimental example

In order to confirm the disconnection rate of the conductor according to the present invention, the conductor was designed with the structure and pitch ratio shown in Table 1 below.

(1) Manufacture of conductors

- Working conditions: 5mpm, Tetron tape 1/4 Lapping sample Each 30m for each condition, 30m for each gear change section between conditions, women's clothing was managed, and MC dies were used.

(2) Insulation

- Working condition: 1 sheet of A/C black laminated A/C on the conductor + 1 sheet of non-woven 0.075T 1/4 LAP (ZS opposite to the conductor twist direction) Insulation compound (EPR POX-5371 BK), outer diameter of conductor 9.7 ㎜ → Insulation outer diameter 14.0㎜

division	structure									pitchby				set outside diameter	Ieast conductor outside diameter	after compression conductor outside diameter	outside diameter opponent ratio
	So Seon-kyung	assembly line	composite structure			pitch				set	center complex	First floor complex	Second floor complex
	mm	glandule Count	center	First floor	Second floor	set	center complex	First floor complex	Second floor complex	ship	ship	ship	ship	mm	mm	mm	%
Example 1	0.4	36	One	6	-	38.7	-	165.7	-	14	-	20	-	2.76	7.3	8.1	111
Example 2	0.2	30	3	9	-	17.6	72.4	99.7	-	14	30	20	-	1.26	4.4	4.7	107
Example 3	0.4	30	3	9	-	35.3	144.7	199.4	-	14	30	20	-	2.52	8.8	9.2	105
Example 4	0.5	30	3	9	-	44.1	180.9	249.3	-	14	30	20	-	3.15	11.0	11.5	105
Example 5	0.5	30	4	11	-	44.1	211.2	279.3	-	14	30	20	-	3.15	12.2	12.7	104
Example 6	0.5	30	One	6	12	44.1	-	283.4	314.9	14	-	30	20	3.15	13.8	14.6	106
Example 7	0.18	7	3	9	-	4.3	16.5	34.2	-	8	16	16	-	0.54	1.9	2.0	107
Example 8	0.51	72	One	6	12	89.8	-	538.7	897.8	18	-	36	36	4.99	21.8	23.2	106
Example 9	0.5	40	3	9	15	51.0	209.1	389.0	434.8	14	30	27	20	3.64	19.0	22.2	117
Comparative Example 1	0.5	30	3	9	-	44.1	180.9	249.3	-	14	30	20	-	3.15	11.0	12.9	118
Comparative Example 2	0.5	30	3	9	-	44.1	180.9	249.3	-	14	30	20	-	3.15	11.0	11.3	103
Comparative Example 3	0.2	6	3	9	-	7.8	31.8	43.9	-	14	30	20	-	0.55	2.0	2.2	113
Comparative Example 4	0.17	7	3	9	-	3.6	17.6	36.3	-	7	18	18	-	0.51	1.8	2.0	113
Comparative Example 5	0.51	72	One	6	12	99.8	-	538.7	897.8	20	-	36	36	4.99	21.8	23.4	108
Comparative Example 6	0.4	30	3	9	-	17.6	144.7	199.4	-	7	30	20	-	2.52	8.8	9.4	107
Comparative Example 7	0.4	30	3	9	-	47.9	144.7	199.4	-	19	30	20	-	2.52	8.8	9.4	107
Comparative Example 8	0.4	30	3	9	-	35.3	144.7	149.6	-	14	30	15	-	2.52	8.8	9.4	107
Comparative Example 9	0.4	30	3	9	-	35.3	144.7	368.9	-	14	30	37	-	2.52	8.8	9.4	107

For each of the conductors prepared in Table 1, a torsional acceleration test was performed under the conditions shown in Table 2 below.

The torsional acceleration test was performed under the accelerated test conditions shown in Table 2 below, but slightly different from the general torsion test conditions, and specifically proceeded as follows.

In order to evaluate various characteristics other than breakage of the conductor of the cable, the test is carried out at the stage of the finished product, but for the purpose of long-term reliability evaluation, one test was conducted for a long time of several tens of days. The accelerated test conditions in Table 2 were set as the acceleration conditions. Acceleration conditions were twist angle and speed, and other external conditions were set similar to or equivalent to those of a normal long-term reliability test. The state of each conductor was conducted in an insulating state to accurately simulate the torsional behavior of the conductor, and a constant load was additionally applied to each test conductor sample to secure an environmental condition equivalent to receiving gravity corresponding to a 12m sample during the test. .

division	Specimen length (m)	torsion angle (degrees/m)	Applied load ratio (%, additional applied weight during test/total sample weight)	speed (Cycles/min)	number of twists (Cycles)
Acceleration Exam conditions	0.5	240	1150	100	20,000
general torsion Exam conditions	12	120	-	3	20,000
note	-	-	Equivalent load with 12m cable	-	-

In addition, in the torsional acceleration test, after fixing each of the conductor samples prepared in each Example and Comparative Example to a jig, twisting at angles of +240 degrees, -480 degrees and +240 degrees with the longitudinal direction of the specimen as an axis is 1 It was set as the condition to be performed twice, and the number of times was continuously performed 20,000 times. After the twisting was completed, the disconnection rate was calculated by counting the number of disconnected wires after stripping the insulation and tape. based on what could be.

Table 3 shows the disconnection rate by observing whether the conductor is disconnected. In particular, Table 3 shows the total number of elements and the number of disconnections included in the conductor for specifically calculating the measured disconnection rate.

division	minor player	single player	monophonic rate
	dog	dog	%
Example 1	252	2	0.8
Example 2	360	0	0.0
Example 3	360	0	0.0
Example 4	360	One	0.3
Example 5	450	2	0.4
Example 6	570	5	0.9
Example 7	84	0	0.0
Example 8	1368	12	0.9
Example 9	1080	4	0.4
Comparative Example 1	360	17	4.7
Comparative Example 2	360	5	1.4
Comparative Example 3	72	4	5.6
Comparative Example 4	84	2	2.4
Comparative Example 5	1368	172	12.6
Comparative Example 6	360	5	1.4
Comparative Example 7	360	41	11.4
Comparative Example 8	360	6	1.7
Comparative Example 9	360	4	1.1

Among the Examples and Comparative Examples, observation photos for representative comparative examples (Comparative Example 1, Comparative Example 2, and Comparative Example 7) in which disconnection was confirmed and whether disconnection was clearly confirmed during the observation process are shown in FIGS. 4 to 6 indicated.

4 to 6 are views showing observation photos for checking whether the conductor for cables according to the above-mentioned comparative examples of the present invention is disconnected.

Referring to FIGS. 4 to 6 , in the appearance after twisting, in Comparative Example 1, the conductor was not sufficiently compressed, so many wires with scratches and oxidation damage on the outside of the conductor were confirmed, and in Comparative Example 2, the compression of the conductor was There were wires with excessive local pressurization of the conductors, and in Comparative Example 7, since the set pitch ratio was long and the interlayer interference between the conductors increased, a large number of broken wires were confirmed.

As can be seen in Tables 1 and 3 above, when the conductor is manufactured in consideration of the relative ratio of the outer diameter in a specific range, the disconnection rate becomes less than 1%, and the disconnection rate of the conductor is greatly improved through improved resistance to torsion. can

The foregoing description of the present application is for illustration, and those of ordinary skill in the art to which the present application pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present application is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present application.

[Explanation of code]

10: Manufacturing method of conductor for cable

S100: First step of manufacturing a center conductor by twisting 7 or more to 72 or less strands to form an aggregated wire

S200: A second step of forming one or more outer conductor layers provided to surround the outer periphery of the central conductor

S300: A third step of manufacturing the conductor by compressing the center conductor and the outer conductor layer through a die

Claims (16)

1. A conductor for a cable comprising a conductor,

   The conductor may include: a central conductor including an aggregation line provided by twisting a plurality of strands; and one or more outer conductor layers provided to surround the outer periphery of the central conductor.

   The conductor, characterized in that all of the following Equations 1 to 3 are satisfied, a conductor for a cable:

   [Formula 1]

   

   [Formula 2]

   

   [Equation 3]

   

   In Equations 1 to 3, D _f is the relative outer diameter ratio (%) of the conductor, D2 is the conductor outer diameter (mm) after compression of the conductor, D1 is the minimum conductor outer diameter (mm) of the conductor, d _w is the wire diameter (mm), which is the diameter of one wire included in the conductor, and n _total means the total number of wires included in the conductor.
2. The method of claim 1,

   The center conductor is a conductor for a cable, characterized in that it includes a composite wire provided as one layer by twisting two or more of the aggregate wires.
3. 3. The method of claim 2,

   The composite wire is a conductor for a cable, characterized in that the three or four aggregate wires are twisted and provided as one layer.
4. 3. The method of claim 2,

   The aggregated wire is a conductor for a cable, characterized in that 7 or more to 72 or less strands are twisted.
5. The method of claim 1,

   The outer conductor layer, characterized in that it comprises an aggregated wire provided by twisting 7 or more to 72 or less stranded wires and a composite wire in which two or more of the aggregated wires are twisted to form a single layer.
6. 6. The method of claim 5,

   The pitch ratio of the assembly line is 8 to 18 times, and the pitch ratio of the composite wire of the outermost outer conductor layer is 16 to 36 times, the cable conductor.
7. 6. The method of claim 5,

   The pitch value of the said assembly line is 4 mm or more - 90 mm or less, The conductor for cables characterized by the above-mentioned.
8. 6. The method of claim 5,

   The pitch value of the said composite wire is 16 mm or more - 540 mm or less, The conductor for cables characterized by the above-mentioned.
9. The method of claim 1,

   The wire is copper, tin-plated copper, aluminum, copper alloy and aluminum alloy, characterized in that at least one selected from the group consisting of, a conductor for a cable.
10. The method of claim 1,

    The wire diameter (mm) which is the diameter of the said wire is less than 0.6 mm, The conductor for cables characterized by the above-mentioned.
11. A conductor for a cable according to any one of claims 1 to 10;

    an insulating layer insulating the conductor; and

    A cable comprising a sheath layer outside the insulating layer for protecting an internal configuration.
12. A first step of manufacturing a center conductor by twisting 7 or more to 72 or less strands to form an aggregated wire;

    a second step of forming one or more outer conductor layers provided to surround the outer periphery of the central conductor; and

    In the method of manufacturing a conductor for a cable comprising a; a third step of manufacturing the conductor by compressing the center conductor and the outer conductor layer through a die,

    The conductor is a method for manufacturing a conductor, characterized in that it satisfies the following Equations 1 to 3:

    [Formula 1]

    

    [Formula 2]

    

    [Equation 3]

    

    In Equations 1 to 3, D _f is the relative outer diameter ratio (%) of the conductor, D2 is the conductor outer diameter (mm) after compression of the conductor, D1 is the minimum conductor outer diameter (mm) of the conductor, d _w is the wire diameter (mm), which is one diameter of the wire twisted in the aggregated wire included in the conductor, and n _{total means the total number} of wires included in the conductor.
13. 13. The method of claim 12,

    The method of manufacturing a conductor for a cable, characterized in that the central conductor formed in the first step includes a composite wire in which two or more of the aggregate wires are twisted to form a single layer.
14. 14. The method of claim 13,

    The composite wire is a method of manufacturing a conductor for a cable, characterized in that provided as one layer by twisting three or four of the aggregate wire.
15. 13. The method of claim 12,

    The outer conductor layer, characterized in that it includes an aggregated wire provided by twisting 7 or more to 72 or less stranded wires and a composite wire provided as a single layer by twisting two or more of the aggregated wires. manufacturing method.
16. 16. The method of claim 15,

    The method of manufacturing a conductor for a cable, characterized in that the pitch ratio of the assembly line is 8 to 18 times, and the pitch ratio of the composite wire of the outermost outer conductor layer is 16 to 36 times.

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