KR20120084930A - Structure of stranded conductor for electrical power cable - Google Patents

Abstract

PURPOSE: A strained conductor structure for a power cable is provided to prevent an insulation coating layer from being damaged due to a stray voltage by regularly arranging an insulation coating strand and a bare conductor strand. CONSTITUTION: A central stranded conductor(211) comprises a plurality of strands. An outer stranded conductor(212) has a fan shape and a circular cross section. The central stranded conductor includes a central strand and a central outer strand(222) comprising six strands which are circularly arranged. The outer stranded conductor has 6(n+1) strands which are spirally arranged on the outer side of the central outer strand. The central strand comprises an insulation coating strand.

Description

Stranded wire structure of conductor for power cable {STRUCTURE OF STRANDED CONDUCTOR FOR ELECTRICAL POWER CABLE}

The present invention relates to underground power cables, and more particularly, to a stranded wire structure of a wire that forms a conductor of a power cable having a multi-segment conductor.

With the development of technology, the power demand inevitably increases, and the outer diameter of the conductor of the power cable is increasing to cope with the increase in power demand.

Increasing the outer diameter of the conductor of the power cable results in a problem of AC loss due to the skin effect. The skin effect increases the AC resistance, which in turn limits the increase in transmission capacity. To reduce this AC loss, multisegmental conductors have been developed.

In the center of the power cable is formed a central conductor consisting of a combination of small wires in the form of a fan-shaped outer stranded portion consisting of three to six segments and a circular central stranded portion at the center thereof.

An inner semiconducting layer is disposed on the outer circumferential surface of the center conductor, an insulating layer is applied to the outer circumferential surface of the inner semiconducting layer, and the insulating layer is applied to the outer semiconducting layer again.

This outer semiconducting layer is again surrounded by a shielding layer made of lead or aluminum, and an outer sheath layer is formed outside the shielding layer.

However, in order to compensate for the loss due to the skin effect, such a multi-segment conductor must be insulated from each other in order to maximize the effect.

If all the wires forming the multi-segment conductor are insulated, organic voltage may be generated between the conductor and the inner semiconducting layer surrounding the conductor, and the insulation coating layer may be damaged during the stranding process. Since the coating is coated with an insulating film, there is a problem that an increase in cost due to the insulating film coating coating per wire conductor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and by appropriately disposing an insulation coating element wire and a conductor element wire in a plurality of element wires forming a multi-segment, the insulation coating layer due to an organic voltage prevents damage, and furthermore, The purpose is to drastically reduce the cost savings due to insulation coating per element coating.

A twisted pair structure of a conductor for a power cable according to the present invention for solving the above problems, the center stranded portion is composed of a plurality of wires in a circular shape, radially disposed in contact with the outer periphery of the center stranded wire portion, the plurality of wires are formed in a fan shape A plurality of outer twisted pairs having a circular cross section in contact with each other, wherein the center twisted pair includes one center element wire in the center and a center outer element wire in which six element wires are arranged in a circular shape outside the center element wire; The outer twisted pair has a structure in which 6 (n + 1) (n is a positive integer) strands are spirally arranged on the outer circumferential surface of the central outer strand, the center strand is made of an insulation coating strand, and the center outer strand is The insulation coating element wire and the conductor element wire are alternately arranged.

Here, the center element is set as one layer layer, and the layer layers positioned outwardly around the center element line are sequentially 2, 3,... In the case of m (m is a positive integer) layer, the wires of the odd layer layer are made of insulation coated insulation wire, and the wires of the even layer layer are arranged with alternating insulation coating wire and conductor wire. It is characterized by being.

Here, the insulating coating element wire is made by applying an insulating film having a predetermined thickness to the bare conductor wire, the insulating film may be made of at least one layer.

Here, the materials constituting the insulating film may be polyvinyl formal, polyester, polyurethane, silicone, epoxy, nylon, phenoxy, polyesterimide, polyamideimide, polyimide, polyhydantoin, polyhydantoin esterimide, and It may be any one selected from the group consisting of enamels.

Here, the insulating film is preferably selected to be coated with enamel.

Here, the outer twisted pair is preferably three or more.

Herein, an insulating film is interposed between the center stranded part, the outer stranded part, and the outer stranded part, respectively, and an insulating film is interposed between each layer layer from the first layer layer to the m layer layer. Do.

According to the above-described configuration of the present invention, by arranging a plurality of element wires constituting the multi-segment insulated coating element wires and bare conductor wires appropriately and regularly, the insulation coating layer due to organic voltage prevents damage and the insulation coating per conductor wire coating It is possible to drastically reduce the cost savings.

1 shows a longitudinal cross-sectional view of a power cable according to the invention.
2 is a perspective view showing the structure of a power cable according to the present invention.
Figure 3 shows the conductor cross-sectional structure of the power cable according to the present invention.
Figure 4 illustrates a central twisted pair of conductors of the power cable according to the present invention.
Figure 5 shows a segment of one of the outer stranded portion of the conductor of the power cable according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described the stranded structure of the conductor for a power cable according to the present invention and its effects.

1 shows a longitudinal cross-sectional view of a power cable according to the invention.

As shown in FIG. 1, the power cable according to the present invention includes a center conductor 11, an inner semi-conductive layer 12 wound around an outer circumference of the center conductor 11, and an inner semiconducting layer 12. Cross-linking-polyethylene (XLPE) formed on the outer circumference of the layer) is press-molded an insulation layer (13), an outer semi-conductive layer (14) wound around the outer circumference of the insulating layer 13, the outside It consists of the metal sheath 15 formed in the outer periphery of the semiconductive layer 14, and the anticorrosive layer 16 coat | covered on the metal sheath 15. As shown in FIG.

The center conductor 11 guides the electric current supplied from the substation to be supplied to the electric power equipment or the like.

The center conductor 11 has a multi-segment structure of the Milliken Type of the split conductor in order to minimize the power loss due to the skin effect.

The inner and outer semiconducting layers 12 and 14 block insulation of heat generated in the process of supplying electric current to the center conductor 11 and have an insulating function. Its role is to suppress partial discharge at the interface through the adhesion effect and to reduce local electric stress concentration.It is composed of semiconducting compound such as semiconducting polyethylene and etc. It is formed by extrusion.

The insulating layer 13 prevents insulation breakdown caused by overcurrent and blocks heat passing through the internal semiconducting layer 12 to the outside.

The metal sheath 15 is made of aluminum and may be formed to have a wave shape (Sine wave, Corrugated Aluminum), that is, a certain waveform to improve bending characteristics (Bending).

The anticorrosive layer 16 is formed by extruding a synthetic resin material such as polyethylene to the outer circumference of the metal sheath 15.

Figure 2 is a perspective view showing the structure of the power cable according to the invention, Figure 3 is a cross-sectional structure of the conductor of the power cable according to the invention, Figure 4 shows a central twisted pair of the conductor of the power cable according to the invention, Figure 5 shows a segment of one of the outer stranded portion of the conductor of the power cable according to the present invention.

The center conductor 11 has a multi-segment structure of the Milliken Type of the split conductor in order to minimize the power loss due to the skin effect.

The center conductor 11 is composed of a central twisted pair part 211 and a plurality of outer twisted pairs 212, and the center twisted pair part 211 and the outer twisted pair part 212 are arranged in accordance with a predetermined rule. .

The central twisted pair part 211 has a circular cross-sectional structure having a shape in which six central outer tiny wires 222 are coupled to the outer circumference of the center element 221 in a 1 + 6 structure.

The outer periphery of the central twisted pair part 211 is provided with six outer twisted pairs 212, and the outer twisted pairs 212 are formed to be adjacent to the outer twisted pairs 212 by having a flat cross section. By the coupling structure of the part 211 and the outer twisted-line part 212, the center conductor 11 is made to have a circular cross section.

The six outer twisted pairs 212 are shown as a preferred embodiment, and having three or more outer twisted pairs can satisfy the problem to be solved of the present invention.

The center conductor 11 formed as described above has the center element line 221 as the center point, that is, the first layer layer 231, and six center outline lines 222 form the two layer layer 232 on the outer circumference thereof.

As an outer periphery of the two layer layer 232, 6 * (n + 1) (n is a positive integer) element wires are arrange | positioned at the outer periphery of a previous layer layer.

Referring to FIG. 3, in the present invention, a three layer layer 233 of twelve element wires, a four layer layer 234 of eighteen element wires, a five layer layer 235 of 24 element wires, and thirty elements 6 layer layer 236 made of element wires, 7 layer layer 237 made of 36 element wires, 8 layer layer 238 made of 42 element wires, 9 layer layer 239 made of 48 element wires, and A center conductor 11 having a ten layer layer 240 of 54 element wires is shown as an example.

In addition, an insulating film is interposed between the center stranded part 211 and the outer stranded part 212 and the outer stranded part 212, respectively, from the first layer layer to the m (m is a positive integer) layer layer. Insulation film may also be interposed between each layer.

4 and 5, the center stranded wire part 211 and the outer stranded wire part 212 are provided with a plurality of element wires according to a predetermined rule, where the plurality of element wires are insulation coated element wires 311 coated with an insulating film. And uncoated insulating conductor wires 312.

Based on the above assumption, the center element wires 221 are one layer layer 231, and the layer layers positioned outwardly with respect to the center element wires 221 are sequentially 2, 3,... It can be said that m (m is a positive integer) layer layer.

Here, the element wires of the odd layer layers 1, 3, 5, ... are made of an insulation coated insulation coating element 311, and the element wires of the even layer layers 2, 4, 6, ... are alternately insulation coated. The insulation coating element 311 and the bare element element 312 are implemented to be disposed.

As a result, all the wires of the odd layer layer are formed of the insulation coating wires 311, and the wires of the even layer layer are formed by dividing the insulation coating wires 311 and the bare wires 312 by 1/2.

The insulation coating element wire 311 is formed by insulating film coating on the bare conductor wire 312, and the material constituting the insulation film is polyvinyl formal, polyester, polyurethane, silicone, epoxy, nylon, phenoxy, polyesterimide It may be any one selected from the group consisting of polyamideimide, polyimide, polyhydantoin, polyhydantoin esterimide and enamel, preferably selected as enamel.

As a result of measuring the skin effect according to the conventional stranded wire structure (when all the wires are insulation coating element wires) and the stranded wire structure of the present invention, the stranded wire structure of the present invention was 1.03 to 1.1 times higher than the conventional stranded wire structure. However, this degree of skin effect difference is a value that is reflected in the AC loss effect insignificantly, it can be seen that it is suitable as an arrangement method of the element wire that can realize the process efficiency and low cost of manufacturing while minimizing the skin effect coefficient.

The twisted-pair structure according to this regular rule arranges a plurality of wires constituting multiple segments by appropriately and regularly arranging the insulation coating wires and the conductor wires, thereby preventing damage to the insulation coating layer caused by organic voltage and applying the insulation coating per conductor wire. It is possible to drastically reduce the cost savings. In addition, the time and the process efficiency of the connection work can be improved.

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 embodiments, but, on the contrary, As will be understood by those skilled in the art. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

11: center conductor 12: inner semiconducting layer
13 insulation layer 14 outer semiconducting layer
15 metal sheath 16: anticorrosive layer
211: center twisted pair 212: outer twisted pair
221: center element wire 222: center outline element wire

Claims (7)

A central twisted line portion having a plurality of strands in a circular shape, a plurality of outer twisted pairs disposed radially in contact with the outer circumference of the center stranded portion, and a plurality of strands in a fan shape and having a circular cross section,
The central twisted pair includes one central element wire in the center and a central outer element wire in which six element wires are arranged in a circular shape to the outside of the central element wire.
The outer stranded portion has a structure in which 6 (n + 1) (n is a positive integer) element wire is spirally arranged on the outer circumferential surface of the central outer elementary wire,
The center element wire is made of an insulation coating element wire, the center outer element wire is made of alternating insulation element wire and a bare conductor element, twisted wire structure of the power cable conductor. The method of claim 1,
2, 3,... Layer layers sequentially positioned outside the center element line as the center layer. In the case of m (m is a positive integer) layer, the wires of the odd layer layer are made of insulation coated insulation wire, and the wires of the even layer layer are arranged with alternating insulation coating wire and conductor wire. Stranded wire structure of conductor for power cable. The method of claim 2,
The insulation coating element wire is made by applying an insulating film having a predetermined thickness to the bare conductor wire,
The stranded structure of a conductor for a power cable, wherein the insulating film includes at least one layer. The method of claim 3,
The material constituting the insulating film is polyvinyl formal, polyester, polyurethane, silicone, epoxy, nylon, phenoxy, polyesterimide, polyamideimide, polyimide, polyhydantoin, polyhydantoin esterimide and enamel The stranded structure of a conductor for a power cable, which is any one selected from the group consisting of. The method of claim 4, wherein
The insulating film is selected by enamel, stranded structure of a conductor for a power cable. The method of claim 1,
The outer twisted pair is three or more, the twisted pair structure of the power cable conductor. The method of claim 6,
An insulating film is interposed between the center stranded part, the outer stranded part, and the outer stranded part, respectively.
Stranded structure of a conductor for a power cable, the insulating film is interposed between each layer layer from the first layer layer to the m layer layer.

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