KR20200069968A - Connecting Conductor For Connecting Different Conductor, Manufacturing Method Of Connecting Conductor And Conneting Structure Of Power Cable - Google Patents

Abstract

The present invention relates to a connection conductor for heterogeneous conductor bonding, which can increase mechanical bonding strength of the connection conductor of a bonding metal shape forming a bonding unit of a heterogeneous conductor, a connection conductor manufacturing method, and an intermediation connection structure of a power cable. The connection conductor for heterogeneous conductor bonding comprises: a first metal unit formed of the same material as a first conductor; and a second metal unit formed of the same material as a second conductor.

Description

Connecting conductors for connecting different conductors, manufacturing method of connecting conductors and power cable intermediate connection structure {Connecting Conductor For Connecting Different Conductor, Manufacturing Method Of Connecting Conductor And Conneting Structure Of Power Cable}

The present invention relates to a connecting conductor for connecting different conductors, a method for manufacturing the connecting conductor, and an intermediate structure of a power cable. More specifically, the present invention relates to a connecting conductor for connecting different conductors capable of improving the mechanical bonding strength of a connecting conductor in the form of a bonding metal constituting a junction of a different conductor, a manufacturing method of a connecting conductor and an intermediate connection structure of a power cable will be.

The power cable for supplying power may include a copper or aluminum-based conductor, an insulating layer, a semiconducting layer, and an outer jacket.

The cable for power transmission is composed of a conductor and an insulator, and the conductor requires high electrical conductivity characteristics to minimize electrical energy loss. Copper and aluminum are excellent conductors for electrical conductivity and are competitive in price, and copper is superior in electrical and mechanical properties excluding density, and copper is mainly applied to conductors for power transmission cables. Aluminum conductors have been limitedly applied only to overhead power transmission lines.

As copper raw material prices rise, copper prices are formed 4-6 times higher than aluminum of the same weight, and the demand to apply aluminum conductors to power transmission cables is also increasing. Since copper has been mainly applied to existing cable conductors, it is expected that the demand for intermediate connection between power cables with copper conductors and power cables with aluminum conductors will increase with the proliferation of aluminum applications.

Conventionally, in the Republic of Korea Patent No. 1128106, etc., in the case of intermediate connection between a power cable having a copper conductor and a power cable having an aluminum conductor, a method of connecting the conductor using a connecting sleeve in the form of a dedicated sleeve for connecting the conductor Was used. The connecting conductor may be composed of a joining metal having an insertion port for inserting a first conductor made of copper or the like, and a joining surface on which an aluminum-based second conductor is mig welded.

A first conductor made of copper or the like is inserted into and pressed into the insertion port of one side of the connecting conductor, and the aluminum conductor can be joined to the other bonding surface by welding or the like.

The connecting conductor is composed of heterogeneous materials of the first metal and the second metal, and friction welding may be considered as a bonding method of the first conductor and the second conductor, but both conductors are heterogeneous conductors and have different melting points, so that the physical joint reliability of the joint is not high. Therefore, there is a problem that it is difficult to secure sufficient mechanical strength at the first metal and the second metal bonding site.

As a problem to solve the problem of providing a connecting conductor for connecting different conductors, a manufacturing method for connecting conductors, and an intermediate connection structure of a power cable that can improve the mechanical bonding strength of a connecting metal-type connecting conductor constituting a junction of a different conductor. do.

In order to solve the above problems, the present invention relates to a connecting conductor for heterogeneous conductor bonding for bonding a first conductor constituting a first power cable and a second conductor constituting a second power cable, the first conductor and A first metal part made of the same material; And, the first metal portion is joined by friction welding, a second metal portion made of the same material as the second conductor; provided, to prevent separation of the first metal portion and the second metal portion of the joint , The junction portion of the first metal portion and the second metal portion may be provided as a connecting conductor for heterogeneous conductor bonding, characterized in that it is formed by being molded in a molten state during resistance welding.

In addition, the melting point of the first metal portion is higher than the melting point of the second conductor, a projection is provided on the bonding surface of the second metal portion, and the projection of the second metal portion is seated on the bonding surface of the first metal portion. It can be formed by the friction welding insert.

In this case, the insertion portion of the first metal portion and the protrusion portion of the second metal portion have a trapezoidal shape, and the thickness of the protrusion portion of the second metal portion may be greater than the depth of the insertion portion of the first metal portion.

In addition, the width of the inner end of the insertion portion of the first metal portion may be greater than the width of the outer end of the protrusion of the second metal portion.

Here, on the inner circumferential surface of the insertion portion of the first metal portion, the second metal portion may be melted and introduced by friction welding to provide a locking groove through which a locking protrusion can be formed.

In addition, the locking groove formed in the insertion portion of the first metal portion may be configured in a ring shape in the circumferential direction of the inner peripheral surface of the insertion portion.

In addition, the first conductor of the first power cable may be inserted into and compressed by the first metal portion of the connecting conductor.

In this case, the second metal part of the connection conductor may be joined to the second conductor of the second power cable by Mig welding.

In addition, the first metal part of the first conductor of the first power cable and the connecting conductor is made of copper or copper alloy, and the second metal part of the second conductor of the second power cable and the connecting conductor is made of aluminum or aluminum alloy. It can be composed of.

here,

In addition, in order to solve the above problems, the present invention is a connecting conductor for the heterogeneous conductor bonding described above; A first conductor of a first power cable joined to a first metal portion of the connecting conductor; A second conductor of a second power cable joined to a second metal portion of the connecting conductor; A corona shield connecting the ends of the insulating layer of the first power cable and the second power cable and surrounding the heterogeneous conductor connection structure; A sleeve member mounted on the outer side of the corona shield and made of a pre-molded joint (PMJ) elastic resin material; And an enclosure member mounted outside the sleeve member, to provide an intermediate connection structure of a heterogeneous conductor power cable.

In addition, in order to solve the above problems, the present invention is a connecting conductor for the heterogeneous conductor bonding described above; A first conductor of a first power cable joined to a first metal portion of the connecting conductor; A second conductor of a second power cable joined to a second metal portion of the connecting conductor; It is possible to provide an intermediate connection structure of a heterogeneous conductor power cable including; a ground insulating layer of the first power cable, an insulating layer of the second power cable, and a reinforcing insulating layer formed around the connecting conductor.

In addition, in order to solve the above problems, the present invention provides a method for manufacturing a connecting conductor for heterogeneous conductor bonding for bonding a first conductor constituting a first power cable and a second conductor constituting a second power cable. The first metal part in the form of a bar with an insertion part is fixed on the surface, and a protrusion is provided on the bonding surface and rotated in a state in which the second metal part in the form of a metal made of a metal material having a lower melting point than the first metal part is brought into contact. , Friction welding step of joining the joint surface of the first metal part and the second metal part by friction welding; An insertion hole forming step of forming an insertion hole into which a first conductor of the first power cable is inserted on a side opposite to a bonding surface of the first metal portion; And a welding surface forming step of forming a welding surface for bonding the second conductor of the second power cable to the side opposite to the bonding surface of the second metal part by the Mig welding method. It is possible to provide a method for manufacturing a conductor.

Here, the friction welding step may be performed so that the second metal portion is melted and introduced in the friction welding process in the locking groove formed in the inner peripheral surface of the insertion portion of the first metal portion to form a locking protrusion.

According to the connection conductor for connecting different conductors according to the present invention, the manufacturing method of the connection conductor and the intermediate connection structure of the power cable, the mechanical bonding strength of the joint of the different conductors can be improved.

1 to 4 illustrate a process for manufacturing a connecting conductor according to one embodiment for bonding a heterogeneous conductor of the present invention.
5 to 7 illustrate a process in which the first conductor of the first power cable is joined to the first joint of the connecting conductor.
8 to 10 illustrate a process in which the second conductor of the second power cable is joined to the second joint of the connecting conductor.
11 illustrates a state in which the first conductor of the first power cable and the second conductor of the second power cable are joined to the first joint and the second joint of the connection conductor, respectively.
12 shows the construction of another embodiment of the connecting conductor.
13 shows a multi-stage stripped perspective view of a power cable having a copper or aluminum-based conductor of the present invention and an XLPE insulating layer.
14 is a sectional view showing an intermediate connection structure of a power cable according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed contents are thorough and complete, and that the spirit of the present invention is sufficiently conveyed to those skilled in the art. Throughout the specification, the same reference numbers refer to the same components.

Depending on the environment (land or seabed, etc.) to be installed in the power cable, the suitability of the conductor may be changed in consideration of costs. Intermediate connection may be performed even when the types of conductors constituting the power cable are different according to the conductor characteristics of the power cable required for each section.

In general, in order to secure flexibility of a power cable, a twisted conductor in which a plurality of conductor wires are twisted instead of a conductor is used.

The stranded conductor has good flexibility, but the conductor bonding method for intermediate connection is distinguished according to the type of conductor. Specifically, crimping is mainly used between copper-based metals due to problems such as an oxide film, and a bonding method such as Mig welding may be used between aluminum-based metals.

However, as described above, when the types of conductors are different and the conductors are formed of stranded wires, the conductors may be bonded by applying a separate sleeve-type connecting conductor 500.

The connecting conductor 500 may have a form of a bonding metal in which different metals are bonded.

1 to 4 show a process of manufacturing a connecting conductor 500 according to one embodiment for bonding a different conductor of the present invention.

The first conductor 10A of the first power cable 100A connected via the connecting conductor 500 of the present invention may be a copper-based stranded conductor, and the second conductor 10B of the second power cable 100B May be an aluminum-based stranded conductor with a relatively low melting point.

The conventionally introduced connecting conductors for connecting different types of metal conductors have very weak mechanical bond strength against the expansion and contraction of conductors by joining both joint surfaces composed of planes by a method such as friction welding.

Therefore, the present invention, in order to solve this, heterogeneous conductor bonding for bonding the first conductor (10A) constituting the first power cable (100A) and the second conductor (10B) constituting the second power cable (100B) In the connecting conductor 500 for, The first conductor (10A) The first metal portion 510 consisting of the same material; And, a second metal part 560 made of the same material as the second conductor 10B, wherein the first metal part 510 and the second metal part 560 are molded in a molten state. It is possible to provide a connecting conductor 500 for joining heterogeneous conductors, characterized in that the joining portion 530 having a shape to prevent separation is formed.

The first metal portion 510 and the second metal portion 560 of the bonding portion 530 is joined by a method such as friction welding, but the present invention furthermore, the first metal portion 510 and the second metal portion ( In the joining portion 530 of 560, a structure that is mutually molded in the friction welding process can be formed to reinforce the mechanical bond strength.

Friction welding is a welding method in which one of the objects to be joined is fixed and the other is rotated at high speed on the other side and pushed to join, and is also called friction pressure welding. When manufacturing the connecting conductor 500 of the present invention, the first metal portion 510 is fixed, and the second metal portion 560 having a low melting point is rotated at high speed to be joined, but a locking protrusion is formed in the engaging groove in the junction during the bonding process. The structure can be adopted to reinforce mechanical stiffness or tensile strength at the junction of the first metal portion and the second metal portion.

Accordingly, in the present invention, in order to form a structure that is mutually molded in a friction welding process at the joint portion 530 of the first metal portion 510 and the second metal portion 560, the first metal portion 510 ) And one of the second metal parts 560 may be provided with a protrusion on the bonding surface and the other with an insertion part.

In the embodiment shown in Figures 1 to 4, the protrusion 561 is provided on the bonding surface 560s of the second metal part 560 composed of an aluminum series having a low melting point, and the protrusion 561 is inserted. The insertion portion 511 may be provided on the bonding surface of the first metal portion 510 of the copper-based high melting point, but is not limited thereto.

And, as shown in Figure 2, in order to join the first metal portion 510 and the second metal portion 560 by a friction welding method, the first metal portion 510 and the second metal portion The 560 is pushed in contact.

2, the insertion portion 511 of the first metal portion 510 and the protrusion 561 of the second metal portion 560 are configured in a trapezoidal shape, and the second metal portion 560 ), the thickness t2 of the protrusion 561 is larger than the depth t1 of the insertion portion 511 of the first metal portion 510, so that the contact surface 510s of each metal portion in contact with friction welding , 560s) may be disposed in a non-contact state.

In addition, the protrusion 561 is inserted into the insertion portion 511, the protrusion portion 561 of the second metal portion 560 to the inner end 511e of the insertion portion 511 of the first metal portion 510 ) In order for the outer end 561e to contact, the thickness t2 of the protrusion 561 of the second metal part 560 is the depth t1 of the insertion part 511 of the first metal part 510. Although configured larger, the width d1 of the inner end 511e of the insertion part 511 of the first metal part 510 has an outer end 561e of the protrusion 561 of the second metal part 560. It may be configured to be larger than the width (d2).

Accordingly, as shown in FIG. 2, friction welding is performed in a state where the outer end 561s of the protruding portion of the second metal portion 560 contacts the inner end portion 511e of the insertion portion of the first metal portion 510. When initiated, melting of the region of the outer end 561e of the protrusion of the second metal portion 560 in contact with the inner end 511e of the insertion portion of the first metal portion 510 may begin.

Then, as shown in FIG. 3, the protrusion 561 of the second metal part 560 is melted to fill the insertion part 511 of the first metal part 510 and the first metal part 510. A joining portion 530 may be formed by joining a periphery of a joining surface of the second metal portion 560.

In addition, in the present invention, the first metal part 510 and the second metal part 560 are molded in a molten state to form a junction 530 having a shape in which separation is prevented. ) On the inner circumferential surface of the insertion portion 511 may be provided with a locking groove 513 in which the second metal portion 560 having a low melting point is melted and introduced through friction welding to form a locking protrusion 563. .

That is, as shown in FIG. 2, the second metal portion 560 having a low melting point is melted and introduced by friction welding on the inner circumferential surface of the insertion portion 511 of the first metal portion 510 to inject the locking protrusion 563 ) When friction welding is started in a state in which a locking groove 513 that can be formed is provided, as illustrated in FIG. 3, the second metal part 560 is melted and the first metal part 510 is inserted. It may flow into the locking groove 513 formed on the inner circumferential surface of the portion 511 to form a locking protrusion 563.

The locking groove 513 is configured to have a ring shape in the circumferential direction of the inner circumferential surface of the insertion portion 511, when the protrusion 561 of the second metal portion 560 is melted and flows in, in the separation direction of each metal portion It can act as a locking structure that provides anti-tension.

In addition, the shape of the engaging groove and the engaging projection may have various shapes as long as the structure can provide the tensile strength when tension is applied in a direction in which the metal portion of the connecting conductor is separated.

1 and 2, the locking groove 513 formed on the inner circumferential surface of the insertion portion 511 of the first metal portion 510 has a ring shape in a circumferential direction of the inner circumferential surface of the insertion portion 511. It may be configured, but the number may also be composed of a plurality.

As shown in FIG. 3, friction welding may be performed until the bonding surfaces 510s and 560s of the first metal part 510 and the second metal part 560 are in close contact, and friction welding is completed. When the burrs and the like discharged between the respective joining surfaces are removed, as illustrated in FIG. 4, an insertion hole 513 or a welding surface 563 for Mig welding may be formed in each metal part.

That is, since the copper-based metal may be more suitable for a compression bonding method due to problems such as an oxide film when welding, an insertion hole through which the conductor of the first power cable 100A can be inserted into the first metal part 510. 513 may be formed, and the second conductor 10B of the aluminum-based second metal part 560 and the second power cable 100B may form an inclined welding surface 563 for mig welding. have.

In addition, the first metal portion 510 and the second metal portion 560 have a bar shape provided with an insertion portion 511 and a protrusion 561, respectively, before forming the insertion portion 511 and the welding surface 563. Although it may be a conductor, the diameter of the conductor of the first power cable 100A may be smaller than the diameter of the conductor of the second power cable 100B due to the difference in the conductivity between copper and aluminum. Therefore, the inner diameter of the insertion hole of the first metal portion 510 may be smaller than the outer diameter of the second metal portion 560 corresponding to the outer diameter of the second conductor 10B.

5 to 7 illustrate a process in which the first conductor 10A of the first power cable 100A is joined to the first joint 530 of the connecting conductor 500.

As shown in FIG. 5, after inserting the first conductor 10A of the first power cable 100A into the insertion hole 513 of the first metal part 510 of the connecting conductor 500 of the present invention, By pressing the outer circumferential surface of the insertion hole 513, the crimping connection of the first metal part 510 and the first power cable 100A conductor may be completed as shown in FIG. 7.

The outer circumferential surface of the insertion hole of the first metal portion 510 may be processed to form a raised portion 515 to be flat after pressing in consideration of a pressing process.

The raised portion 515 can be pressed in the pressing process to minimize the gap between the first conductor 10A and strengthen the fastening force between the conductor and the metal portion. In addition, as shown in FIG. 7, the raised portion 515 is flattened in the process of crimping and bonding, so that changes in the outer diameter of the entire connecting conductor 500 are minimized, thereby alleviating electric field concentration and the like.

8 to 10 illustrate a process in which the second conductor 10B of the second power cable 100B is joined to the second joint 530 of the connecting conductor 500.

The second metal part 560 is formed with an inclined welding surface 563 for Mig welding as shown in FIG. 4, and the ends of the second conductor 10B are also processed in an inclined surface in a symmetrical direction to perform Mig welding. Bonding can be completed.

Mig welding is a kind of arc welding in which an inert gas is shielded from a welding wire, and the welding part is prevented from being oxidized by an inert gas, so it is widely used for aluminum-based welding.

In addition, when welding is completed, a process of removing burrs or protruding weld metals wm may be performed to minimize variations in outer diameters of the second metal part 560 and the second conductor 10B.

11 shows the first conductor 10A and the second power cable 100B of the first power cable 100A to the first joint 530 and the second joint 530 of the connecting conductor 500, respectively. The state where the 2nd conductor 10B is joined is shown.

In the case of the conventionally introduced connecting conductor, the connecting conductor was constructed by friction welding a metal part having a flat flat joint surface, but it was known that the problem of easily detaching the joint by friction welding in subsequent Mig welding or the like occurred. As shown in FIG. 11, the first metal part 510 and the second metal part 560 of the connecting conductor 500 are joined by friction welding, and at the same time, the joint 530 is locked in the process of melting the joint. The mechanical bonding force between the metal parts is strengthened by forming the 513 and the locking projections 563, the first conductor 10A is joined by a pressing method, and the second conductor 10B is joined by a Mig welding method. As a result, it is possible to obtain an effect of improving the mechanical fastening force while minimizing the deviation in the overall diameter of the entire conductor connection section.

12 shows the configuration of another embodiment of the connecting conductor 500.

In the above-described embodiments, the insertion portion is formed on the bonding surface of the first metal portion of the copper series constituting the connection conductor 500, and the protrusion is formed on the bonding surface of the second metal portion of the aluminum series.

However, the positions of the protrusions and the inserts may be changed. That is, as shown in FIG. 12, the protrusion 511 ′ is formed on the bonding surface of the first metal part 510 ′ of the copper series, and the insertion part is attached to the bonding surface of the second metal part 560 ′ of the aluminum series. (561').

Further, in order to strengthen the mechanical fastening force, at least one locking groove 513' is formed on the outer circumferential surface of the protruding portion 511' of the first metal portion 510', so that the molten liquid of the second metal portion 560' is A method of constructing a locking protrusion by allowing the first metal portion 510' to flow into the locking groove 513 is also possible.

Figure 13 shows a multi-stage stripped perspective view of a power cable having a copper or aluminum-based conductor of the present invention and an XLPE insulating layer.

13 shows a multi-stage stripped perspective view of a power cable having a copper or aluminum-based conductor of the present invention and an XLPE insulating layer.

Referring to FIG. 13, the power cable 100 is provided with a conductor 10 at the center. The conductor 10 serves as a passage through which current flows, and may be formed of, for example, a material of copper or aluminum (including aluminum alloy). The conductor 10 may be configured in a twisted pair structure by twisting a plurality of conductor wires for flexibility.

The conductor 10 may have a non-uniform surface, and the electric field may be uneven, and corona discharge is likely to occur in part. In addition, if voids are formed between the surface of the conductor 10 and the insulating layer 14 to be described later, insulation performance may be deteriorated. In order to solve the above problems, an inner semiconducting layer 12 made of a semiconductive material such as semiconductive carbon paper may be provided outside the conductor 10.

The inner semiconducting layer 12 improves the dielectric strength of the insulating layer 14, which will be described later, by making the electric charge evenly distributed on the conductor surface uniform. Furthermore, it is possible to prevent the formation of a gap between the conductor 10 and the insulating layer 14 to prevent corona discharge and ionization.

An insulating layer 14 is provided outside the inner semiconducting layer 12. In general, the insulating layer 14 must have a high breakdown voltage, and the insulating performance must be stably maintained for a long time. Furthermore, it must have low dielectric loss and have resistance to heat such as heat resistance.

The insulation layer of the power cable is mainly applied with paper insulation or a resin material (such as XLPE).

Polyolefin resins such as polyethylene and polypropylene are used as the insulating layer 14 made of a resin material, and polyethylene resins are preferred. The polyethylene resin may be a crosslinked resin and may be prepared by a silane or an organic peroxide as a crosslinking agent, for example, dicumyl peroxide (DCP). The insulating layer 14 of the power cable shown in Figure 13 shows an example made of XLPE material.

Further, an outer semiconducting layer 16 is provided outside the insulating layer 14. The outer semiconducting layer 16 is grounded to serve to improve the dielectric strength of the insulating layer 14 by making the distribution of electric force lines between the above-described inner semiconductive layer 12 an equipotential. In addition, the outer semiconducting layer 16 can smooth the surface of the insulating layer 14 in the cable to alleviate electric field concentration to prevent corona discharge.

A metal sheath 18 or the like is provided outside the outer semiconducting layer 16 according to the type of cable. The metal sheath 18 may be used as a return for electrical shielding and short-circuit current, and the metal sheath 18 may be replaced by a shielding layer composed of a neutral wire shape.

The outer jacket 20 is provided on the outermost side of the power cable 100. The outer jacket 20 is provided on the outermost side of the cable 100 to protect the internal configuration of the power cable 100. Accordingly, the outer jacket 20 may be generally made of PVC (Polyvinyl chloride) or PE (Polyethylene: polyethylene).

The conductor of the power cable 100 may have a twisted pair structure as described above, may be made of copper or aluminum or each alloy material, and has the advantage of good conduction in the case of copper and low price in the case of aluminum. . And when laying power cables, intermediate connections can be performed at intervals of hundreds of meters or kilometers.

According to the connecting conductor 500 of the present invention, the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B have different diameters (two-way and different conductors) Edo conductors can be joined. Referring to FIG. 14, the connection structure of the different diameter and different conductors and the intermediate connection structure of the power cable including the same will be described.

14 is a sectional view showing an intermediate connection structure of a power cable according to an embodiment of the present invention.

In the embodiment shown in FIG. 14, the first conductor 10A is composed of a copper stranded wire, and the second conductor 10B is composed of an aluminum stranded wire.

Referring to FIG. 14, the intermediate connection structure 300 includes a first conductor 10A and a second conductor 10B of the pair of first power cables 100A and a second power cable 100B, and the first Connecting conductors 500 that are joined to the conductors 10A and the second conductor 10B by compression and welding, respectively, and the insulating layer of the pair of first power cables 100A and second power cables 100B ( 14A, 14B) connected to the corona shield 320 configured to surround the conductor bonding structure by the connecting conductor 500 and the pair of first power cables 100A and second power cables 100B outside. It is made of an elastic resin material wrapped and shrinkable at room temperature, and may include a pre-molded joint (PMJ) sleeve member 360. The sleeve member 360 may have a hollow shape.

The connecting conductor 500 of the present invention adopts a structure in which the conductors 10A and 10B of both power cables are connected in both directions, and a locking groove and a locking protrusion are formed in the connection part in the process of joining the first metal part and the second metal part. It may be a structure that improves the tensile strength.

A corona shield 320 may be mounted outside the connection conductor 500. The corona shield 320 is formed to extend from the insulating layer 14A of the first power cable 100A toward the insulating layer 14B of the second power cable 100B. In this case, the corona shield 320 has a flat outer surface, is configured to surround the connecting conductor 500, and is a continuous surface without a step with the surface of the pair of insulating layers 14A, 14B facing each side. To prevent or mitigate electric field concentration. In addition, corona discharge that may occur between the pair of first conductors 10A and second conductors 10B and the sleeve member 360 connected by the connecting conductor 500 can be prevented.

The corona shield 320 also adopts a structure that clamps the ends of the insulating layers 14a and 14b of both power cables, respectively, to provide a tensile or positioning function when both power cables or conductors are stretched, but supports the conductor itself. Since the connection conductor of the present invention is not a structure to be provided, it is possible to provide a structure for supporting tension according to the extension of a power cable or a conductor together with the corona shield.

In an embodiment of the present invention, since a pair of cables 100A and 100B having different diameters are connected to each other, the corona shield 320 also has a structure in which both sides have different diameters, and the outer side is a second electric power having a relatively large diameter. The cable 100B may have a structure inclined toward the first power cable 100A having a relatively small diameter.

The sleeve member 360 is provided on the outer side of the corona shield 320, and is made of copper, and has a first end 330A, into which an end of the first power cable 100A having a relatively small conductor diameter is inserted. The first electrode 330, which is made of aluminum and has a second end 330B into which the end of the relatively large diameter second power cable 100B is inserted, faces away from the first electrode 330. A pair of second electrodes 340 and the first electrode 330, the second electrode 340, and the pair of first power cables 100A and the second power cables 100B having insulating layers ( 14A, 14B) may include a sleeve insulating layer 350. The sleeve insulating layer 350 may be formed of Ethylene Propylene Diene Monomer (EPDM) or Liquid Silicon Rubber (LSR).

The first electrode 330 is made of a semi-conductive material and is electrically connected to the first conductor 10A and the second conductor 10B of the power cable, and serves as a so-called high-voltage electrode. The second electrode 340 is also made of a semiconducting material, and is connected to the external semiconducting layers 16A and 16B of the power cable to serve as a so-called shield electrode. Accordingly, the electric field distribution in the intermediate junction box 300 is distributed along the first electrode 330 and the second electrode 340, and the first electrode 330 and the second electrode 340 are In the meantime, it plays a role of spreading the electric field evenly without being localized.

Specifically, the first electrode 330 is made of a semiconducting material and is electrically connected to the first conductor 10A and the second conductor 10B of the power cable, and serves as a so-called high-voltage electrode. The second electrode 340 is also made of a semiconducting material, and is connected to the external semiconducting layers 16A and 16B of the power cable to serve as a so-called shield electrode. Therefore, the electric field distribution in the intermediate junction box 300 is distributed along the first electrode 330 and the second electrode 340.

In this case, the first electrode 330 has a distance D1 from the center of the cable at the first end 330A to the outer surface and a distance D2 from the center of the second end 330B to the outer surface. Same as each other, each distance (L1, L2) from each center to the inner surface at the first end (330A) and the second end (330B), and each of the first power cable (100A) and the second power cable (100B) ) The distances P1 and P2 from the surfaces of the insulating layers 14A and 14B to the outer surface may be determined differently.

The first conductor 10A and the second conductor 10B have different materials and diameters, and accordingly, the insulating layers 14A, 14B of the first power cable 100A and the second power cable 100B from the center of the cable. Although the distance to the outer circumferential surface is different, the distances L1 and L2 from each center to the inner surface at the first end 330A and the second end 330B and the respective first power cables 100A and second power cables By varying the distances P1 and P2 from the surfaces of the insulating layers 14A and 14B of (100B) to the outer surface, the first electrode 330 is connected from the cable center at the location of the first end 330A to the outer surface. The distance D1 of and the distance D2 from the center of the second end 330B to the outer surface may be matched.

Further, the intermediate connection structure 300 includes an enclosure member 200 made of a so-called'coffin box' or'metal casing' surrounding the sleeve member 360. At this time, a space between the housing 200 and the sleeve member 360 may be filled with a waterproof material (not shown).

14 is an example of an intermediate connection structure for connecting a power cable having an insulation layer made of XLPE material as an example of a pair of power cables having heterogeneous and different diameter conductors, but the conductor is a conductor connection structure according to the present invention. The power cable to be connected may be a ground insulation cable.

That is, the heterogeneous conductor connection structure and the heterogeneous conductor connection method using the connecting conductor 500 of the present invention with reference to FIGS. 1 to 12 can be applied to the connection of the heterogeneous and different diameter conductors described above, and the insulation of the power cable to be intermediately connected. Depending on the type of layer, in addition to the intermediate connection structure in which the corona shield and the sleeve member are mounted outside the conductor connection structure, the intermediate layer is provided with a reinforced insulating layer that is configured to be connected to the insulation layer of both insulated power cables by winding an insulating paper outside the conductor connection structure It is also applicable to the connection structure, and in the case of such an intermediate insulating structure, a rigid joint having an enclosure member or a structure of restoring each cable layer outside the reinforced insulating layer is omitted. It should be noted that it can also be applied to flexible flexible joints.

Although this specification has been described with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can do it. Therefore, if the modified implementation basically includes the components of the claims of the present invention, it should be considered that all are included in the technical scope of the present invention.

10A: first conductor
100A: 1st power cable
10B: second conductor
100B: Second power cable
300: intermediate connection structure
500: connecting conductor
510: first metal part
560: second metal part

Claims (13)

In the connection conductor for heterogeneous conductor bonding for bonding the first conductor constituting the first power cable and the second conductor constituting the second power cable,
A first metal part made of the same material as the first conductor; And,
It is joined by friction welding with the first metal portion, and a second metal portion made of the same material as the second conductor.
In order to prevent separation of the first metal part and the second metal part from the bonding part, the first metal part and the second metal part are joined by being formed in a molten state during resistance welding. Connecting conductor for conductor bonding. According to claim 1,
The melting point of the first metal part is higher than the melting point of the second conductor, a protrusion is provided on the bonding surface of the second metal part, and the protrusion of the second metal part is seated on the bonding surface of the first metal part to rub Connection conductor for heterogeneous conductor bonding, characterized in that the welded insert is formed. According to claim 2,
The insertion portion of the first metal portion and the protrusion portion of the second metal portion are formed in a trapezoidal shape, and the thickness of the protrusion portion of the second metal portion is greater than the depth of the insertion portion of the first metal portion. Conductor. According to claim 3,
A connecting conductor for heterogeneous conductor bonding, wherein the width of the inner end of the insertion portion of the first metal portion is larger than the width of the outer end of the protrusion of the second metal portion. According to claim 2,
Connection conductors for joining heterogeneous conductors, characterized in that a locking groove is provided in which a second metal portion is melted and introduced by friction welding on an inner circumferential surface of the insertion portion of the first metal portion to form a locking projection. The method of claim 5,
The engaging groove formed in the insertion portion of the first metal portion is formed in a ring shape in the circumferential direction of the inner circumferential surface of the insertion portion. According to claim 2,
A connecting conductor for heterogeneous conductor bonding, characterized in that the first conductor of the first power cable is inserted and compressed by a first metal portion of the connecting conductor. According to claim 2,
The second metal part of the connection conductor is a connection conductor for heterogeneous conductor bonding, characterized in that the second conductor of the second power cable is joined by Mig welding. According to claim 1,
The first conductor of the first power cable and the first metal part of the connecting conductor are made of copper or copper alloy, and the second conductor of the second power cable and the second metal part of the connecting conductor are made of aluminum or aluminum alloy material. Characterized in that the connecting conductor for heterogeneous conductor bonding. A connecting conductor for heterogeneous conductor bonding according to any one of claims 1 to 9;
A first conductor of a first power cable joined to a first metal portion of the connecting conductor;
A second conductor of a second power cable joined to a second metal portion of the connecting conductor;
A corona shield connecting the ends of the insulating layer of the first power cable and the second power cable and surrounding the heterogeneous conductor connection structure;
A sleeve member mounted on the outer side of the corona shield and made of a pre-molded joint (PMJ) elastic resin material; And,
Intermediate connection structure of a heterogeneous conductor power cable comprising; an enclosure member mounted on the outer side of the sleeve member. A connecting conductor for heterogeneous conductor bonding according to any one of claims 1 to 9;
A first conductor of a first power cable joined to a first metal portion of the connecting conductor;
A second conductor of a second power cable joined to a second metal portion of the connecting conductor;
Intermediate connection structure of a heterogeneous conductor power cable comprising;; a ground insulating layer of the first power cable, an insulating layer of the second power cable, and a reinforcing insulating layer formed around the connecting conductor. In the first conductor constituting the first power cable and the second conductor constituting the second power cable, a method for manufacturing a connecting conductor for heterogeneous conductor bonding,
The first metal part in the form of a bar with an insertion part is fixed to the bonding surface, and a protrusion is provided on the bonding surface, and the second metal part in the form of a metal made of a metal material having a lower melting point than the first metal part is rotated in contact. A friction welding step of joining the joint surfaces of the first metal part and the second metal part by friction welding;
An insertion hole forming step of forming an insertion hole into which the first conductor of the first power cable is inserted on a side opposite to the bonding surface of the first metal portion;
And a welding surface forming step of forming a welding surface for joining the second conductor of the second power cable to the side opposite to the bonding surface of the second metal part by the Mig welding method. Conductor manufacturing method. The method of claim 12,
The friction welding step is a method of manufacturing a connecting conductor for heterogeneous conductor bonding, characterized in that the second metal portion is melted and introduced in a friction welding process to a locking groove formed in the inner peripheral surface of the insertion portion of the first metal portion to form a locking protrusion. .

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