KR102625957B1 - Connecting Conductor For Connecting Different Conductor, Manufacturing Method Of Connecting Conductor And Conneting Device Of Power Cable - Google Patents

Abstract

It relates to a connecting conductor for joining dissimilar conductors that can improve the mechanical bonding strength of the connecting conductor in the form of bonding metal constituting the joint of dissimilar conductors, a method of manufacturing the connecting conductor, and an intermediate connection device for power cables.

Description

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

The present invention relates to a connecting conductor for joining dissimilar conductors, a method of manufacturing the connecting conductor, and a power cable intermediate connection device. More specifically, the present invention relates to a connecting conductor for joining dissimilar conductors that can improve the mechanical bonding strength of the connecting conductor in the form of bonding metal constituting the joint of dissimilar conductors, a method of manufacturing the connecting conductor, and an intermediate connecting device for a power cable. will be.

A power cable for power supply may be composed of a copper or aluminum-based conductor, an insulating layer, a semiconducting layer, and an external jacket.

Cables for power transmission are composed of conductors and insulators, and the conductors require high electrical conductivity characteristics to minimize electrical energy loss. Copper and aluminum have excellent electrical conductivity and are cost-competitive conductor materials. Copper is superior in electrical and mechanical properties except density, so copper is mainly applied to conductors for power transmission cables, and its lightweight properties are important. Aluminum conductors have been applied only to overhead power transmission lines where they are required.

As the price of copper raw materials rises, the price of copper is 4 to 6 times higher than that of aluminum of the same weight, and the demand to apply aluminum conductors to cables for power transmission is increasing. Since copper has been mainly applied to conductors for existing cables, the demand for intermediate connections between power cables with copper conductors and power cables with aluminum conductors is expected to increase as the application of aluminum spreads.

Conventionally, in Korea Patent No. 1128106, etc., when intermediately connecting a power cable with a copper conductor and a power cable with an aluminum conductor, a method of connecting the conductors using a connecting conductor in the form of a dedicated sleeve for connecting the conductors This was used. The connecting conductor may be made of a joint metal having an insertion hole for inserting a first conductor made of copper or the like and a joint surface on which an aluminum-based second conductor is Mig welded.

A first conductor made of copper or the like can be inserted into the insertion hole on one side of the connecting conductor and pressed, and an aluminum conductor can be bonded to the other side joint surface by a method such as welding.

The connecting conductor is made of dissimilar materials of a first metal and a second metal, and friction welding can be considered as a joining method for the first and second conductors. However, both conductors are dissimilar conductors and have different melting points, so 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 joint area between the first metal and the second metal.

The problem sought to be solved is to provide a connecting conductor for joining dissimilar conductors, a method of manufacturing the connecting conductor, and an intermediate connection device for power cables that can improve the mechanical bonding strength of the connecting conductor in the form of bonding metal constituting the joint of dissimilar conductors. do.

In order to solve the above problem, the present invention provides a connecting conductor for joining dissimilar conductors for joining a first conductor constituting a first power cable and a second conductor constituting a second power cable, the first conductor and a first metal portion made of the same material; and a second metal part joined to the first metal part by friction welding and made of the same material as the second conductor, to prevent separation of the joint between the first metal part and the second metal part. , it is possible to provide a connecting conductor for joining dissimilar conductors, wherein the joint portion of the first metal portion and the second metal portion is formed by being joined 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 protrusion is provided on the bonding surface of the second metal portion, and the protrusion of the second metal portion is seated on the bonding surface of the first metal portion. An insertion portion that is friction welded may be formed.

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

Also, the width of the inner end of the insertion part of the first metal part may be larger than the width of the outer end of the protruding part of the second metal part.

Here, a locking groove in which a locking protrusion can be formed by melting and flowing in the second metal part during friction welding may be provided on the inner peripheral surface of the insertion part of the first metal part.

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

Additionally, the first conductor of the first power cable may be inserted and compressed to join the first metal part of the connecting conductor.

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

In addition, the first conductor of the first power cable and the first metal part of the connecting conductor are made of copper or a 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 an aluminum alloy. It can be composed of:

here,

In addition, in order to solve the above problem, the present invention includes a connecting conductor for joining the above-described heterogeneous conductors; a first conductor of the first power cable joined to the first metal portion of the connecting conductor; a second conductor of the second power cable joined to the second metal portion of the connecting conductor; a corona shield connecting ends of the insulating layers of the first power cable and the second power cable and surrounding the heterogeneous conductor connection structure; A sleeve member mounted on the outside of the corona shield and made of an elastic resin material in the form of a PMJ (Pre molded joint); And, an enclosure member mounted on the outside of the sleeve member. It is possible to provide an intermediate connection device for a heterogeneous conductor power cable including a.

In addition, in order to solve the above problem, the present invention includes a connecting conductor for joining the above-described heterogeneous conductors; a first conductor of the first power cable joined to the first metal portion of the connecting conductor; a second conductor of the second power cable joined to the second metal portion of the connecting conductor; An intermediate connection device for a heterogeneous conductor power cable including a ground insulation layer of the first power cable, an insulation layer of the second power cable, and a reinforcing insulation layer formed by winding around the connection conductor can be provided.

In addition, in order to solve the above problem, the present invention relates to a method of manufacturing a connecting conductor for joining dissimilar conductors for joining a first conductor constituting a first power cable and a second conductor constituting a second power cable, comprising: A first metal part in the form of a bar having an insertion part on the surface is fixed, and a second metal part in the form of a bar having a protrusion on the joint surface and made of a metal material with a lower melting point than the first metal part is rotated while in contact with the second metal part. , 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 joint surface of the first metal part; A welding surface forming step of forming a welding surface for joining the second conductor of the second power cable by a Mig welding method on a side opposite to the joining surface of the second metal part. A connection for joining dissimilar conductors, comprising a. A conductor manufacturing method can be provided.

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

According to the connecting conductor for joining dissimilar conductors, the connecting conductor manufacturing method, and the intermediate connecting device for power cables according to the present invention, the mechanical bonding strength of the joint of dissimilar conductors can be improved.

1 to 4 show a process for manufacturing a connecting conductor according to an embodiment for joining dissimilar conductors of the present invention.
5 to 7 show 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 show a process in which the second conductor of the second power cable is joined to the second joint of the connecting conductor.
Figure 11 shows a state in which the first conductor of the first power cable and the second conductor of the second power cable are respectively joined to the first junction and the second junction of the connecting conductor.
Figure 12 shows the configuration of another embodiment of the connecting conductor.
Figure 13 shows a multi-stage stripped perspective view of a power cable having a copper or aluminum-based conductor and an XLPE insulation layer of the present invention.
Figure 14 shows a cross-sectional view of an intermediate connection device for 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 attached 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 so that the disclosure will be thorough and complete, and so that the spirit of the invention can be sufficiently conveyed to those skilled in the art. Like reference numerals refer to like elements throughout the specification.

Depending on the environment in which a power cable is laid (on land or under the sea, etc.), the suitability of the conductor may change in consideration of cost, etc. Intermediate connection can be performed even when the types of conductors constituting the power cable are different depending on the conductor characteristics of the power cable required for each section.

In general, in order to secure flexibility in power cables, stranded conductors are used instead of solid conductors, with multiple conductor wires twisted together.

Stranded conductors have good flexibility, but conductor joining methods for intermediate connections are differentiated depending on the type of conductor. Specifically, compression bonding is mainly used between copper-based metals due to problems such as oxide films, and joining methods such as Mig welding can be used between aluminum-based metals.

However, as described above, when the types of conductors are different and the conductors are composed of stranded wires, the conductors can be joined by applying a separate sleeve-shaped connecting conductor 500.

The connecting conductor 500 may have a bonded metal form in which dissimilar metals are joined.

1 to 4 show a process for manufacturing a connecting conductor 500 according to an embodiment for joining dissimilar conductors of the present invention.

The first conductor 10A of the first power cable 100A connected through 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.

Conventionally introduced connecting conductors for connecting dissimilar metal conductors join both flat joint surfaces using friction welding, etc., so the mechanical bonding strength in preparation for conductor expansion and contraction is very weak.

Therefore, in order to solve this problem, the present invention provides a dissimilar conductor bonding method for joining the first conductor 10A constituting the first power cable 100A and the second conductor 10B constituting the second power cable 100B. A connecting conductor (500) for: a first metal portion (510) made of the same material as the first conductor (10A); 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 joined in a molten state. It is possible to provide a connecting conductor 500 for joining dissimilar conductors, which is characterized by forming a joint 530 in a shape that prevents separation.

The joint portion 530 of the first metal portion 510 and the second metal portion 560 is joined by a method such as friction welding, but the present invention goes further to form the first metal portion 510 and the second metal portion ( The mechanical bonding strength can be strengthened by forming a structure that is joined to each other during the friction welding process at the joint 530 of 560).

Friction welding is a welding method in which one of the joining objects is fixed and the other is rotated at high speed on the opposite side and pressed to join, and is also called friction pressure welding. When manufacturing the connecting conductor 500 of the present invention, the first metal part 510 is fixed and the second metal part 560, which has a low melting point, is rotated at high speed to join it. However, during the joining process, a locking protrusion is formed in the locking groove inside the joint. The structure can be adopted to reinforce mechanical rigidity or tensile strength at the joint of the first metal part and the second metal part.

Therefore, the present invention is to form a structure in which the first metal part 510 and the second metal part 560 are joined to each other during a friction welding process at the joint 530 of the first metal part 510 and the second metal part 560. ) and one of the second metal parts 560 may be provided with a protrusion on the joint surface, and the other may be provided with an insertion part.

1 to 4, the protrusion 561 is provided on the joining surface 560s of the second metal part 560 made of aluminum with a low melting point, and the protrusion 561 is inserted. The insertion portion 511 may be provided on a joint surface of the first metal portion 510 of a copper-based metal having a high melting point, but is not limited thereto.

And, as shown in FIG. 2, in order to join the first metal part 510 and the second metal part 560 by a friction welding method, the first metal part 510 and the second metal part 560 are (560) is pushed into contact state.

As shown in FIG. 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 part 511 of the first metal part 510, so that when contacting for friction welding, the joining surface 510s of each metal part , 560 s) can be arranged in a non-contact state.

In addition, the protrusion 561 is inserted into the insertion portion 511, and the protrusion 561 of the second metal portion 560 is positioned at 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 equal to the depth t1 of the insertion part 511 of the first metal part 510. It is configured to be larger, and the width d1 of the inner end 511e of the insertion part 511 of the first metal part 510 is greater than the outer end 561e of the protrusion 561 of the second metal part 560. It can be configured to be larger than the width (d2) of .

Therefore, as shown in FIG. 2, friction welding is performed with the outer end 561s of the protrusion of the second metal part 560 in contact with the inner end 511e of the insertion part of the first metal part 510. Once initiated, melting of the area of the protruding outer end 561e of the second metal part 560 that is in contact with the inner end 511e of the insertion part of the first metal part 510 may begin.

Then, as shown in FIG. 3, the protrusion 561 of the second metal part 560 is melted and fills the insertion part 511 of the first metal part 510 to form the first metal part 510 and the The joint portion 530 may be formed by bonding the periphery of the joint 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 joined in a molten state to form a joint part 530 of a shape that prevents separation. ) on the inner peripheral surface of the insertion portion 511, a locking groove 513 through which the second metal portion 560 with a low melting point can be melted and introduced in friction welding to form a locking protrusion 563 can be provided. .

That is, as shown in FIG. 2, the second metal part 560 with a low melting point is melted and introduced into the inner peripheral surface of the insertion part 511 of the first metal part 510 during friction welding, thereby forming a blocking protrusion 563. ), when the friction welding starts in a state where the locking groove 513 can be formed, as shown 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 peripheral 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 part 511, so that when the protrusion 561 of the second metal part 560 is melted and introduced, it moves in the separation direction of each metal part. It can act as a locking structure that provides tensile strength.

In addition, the shapes of the locking groove and the locking protrusion can have various shapes as long as they have a structure that can provide tensile force when tension is applied in the direction in which the metal part of the connecting conductor is separated.

As shown in Figures 1 and 2, the locking groove 513 formed on the inner peripheral surface of the insertion portion 511 of the first metal portion 510 has a ring shape in the circumferential direction of the inner peripheral surface of the insertion portion 511. However, the number may also be comprised of multiple pieces.

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

That is, since the compression joining method may be more suitable for copper-based metals due to problems such as oxidation film during welding and joining, the first metal part 510 has an insertion hole into which the conductor of the first power cable 100A can be inserted. (513) can be formed, and the aluminum-based second metal part 560 and the second conductor 10B of the second power cable 100B can form an inclined welding surface 563 for Mig welding. there is.

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

5 to 7 show 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 portion 510 of the connecting conductor 500 of the present invention, By compressing the outer peripheral surface of the insertion hole 513, the compression connection between the first metal part 510 and the conductor of the first power cable 100A can be completed as shown in FIG. 7.

The outer circumferential surface of the insertion hole of the first metal part 510 may be processed to form a raised portion 515 so as to be in a flat state after compression, considering the compression process.

The raised portion 515 can be pressed during the compression process to minimize the gap between the first conductors 10A and strengthen the fastening force between the conductor and the metal part. In addition, as shown in FIG. 7, the protruding portion 515 is flattened during the compression bonding process, thereby minimizing the change in the overall outer diameter of the connecting conductor 500, thereby alleviating electric field concentration.

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

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

Mig welding is a type of arc welding that shields the welding wire with an inert gas. The inert gas prevents oxidation of the welded area, so it is widely used in aluminum-based welding.

Then, when welding is completed, a process of removing burrs or protruding weld metal (wm) can be performed to minimize the deviation in the outer diameters of the second metal portion 560 and the second conductor 10B.

11 shows the first conductor 10A and the second power cable 100B of the first power cable 100A at the first junction 530 and the second junction 530 of the connecting conductor 500, respectively. The second conductor 10B is shown in a joined state.

In the case of the conventionally introduced connecting conductor, the connecting conductor was constructed by friction welding a metal part having a flat plane joint surface. However, it was known that the problem of the joint due to friction welding being easily separated in subsequent Mig welding, etc. occurred, but the present invention As shown in FIG. 11, the first metal portion 510 and the second metal portion 560 of the connecting conductor 500 are joined by friction welding, and at the same time, a locking groove is formed in the joint portion 530 during the melting process. By forming (513) and the locking protrusion 563, the mechanical bonding force between the metal parts is strengthened, the first conductor (10A) is joined by a pressing method, and the second conductor (10B) is joined by a Mig welding method. This has the effect of minimizing the overall outer diameter deviation of the conductor connection section and improving the mechanical fastening force.

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

In the above-described embodiments, an insertion portion was formed on the joint surface of the first copper-based metal part constituting the connecting conductor 500, and a protrusion was formed on the joint surface of the second aluminum-based metal part.

However, the positions of the protruding portion and the insertion portion may be changed. That is, as shown in FIG. 12, a protrusion 511' is formed on the joining surface of the copper-based first metal part 510', and an insertion part is formed on the joining surface of the aluminum-based second metal part 560'. (561') can be configured.

In addition, in order to strengthen the mechanical fastening force, at least one locking groove 513' is formed on the outer peripheral surface of the protrusion 511' of the first metal part 510', so that the melt of the second metal part 560' It is also possible to construct a locking protrusion by allowing it to flow into the locking groove 513 of the first metal portion 510'.

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

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

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

The surface of the conductor 10 is not smooth, so the electric field may be non-uniform, and corona discharge is likely to occur locally. Additionally, if a gap is created between the surface of the conductor 10 and the insulating layer 14, which will be described later, the insulating performance may deteriorate. In order to solve the above problems, an internal semiconducting layer 12 made of a semiconducting material such as semiconducting carbon paper may be provided on the outside of the conductor 10.

The internal semiconducting layer 12 improves the dielectric strength of the insulating layer 14, which will be described later, by equalizing the electric field by evenizing the charge distribution on the conductor surface. Furthermore, it can perform the function of preventing corona discharge and ionization by preventing the formation of a gap between the conductor 10 and the insulating layer 14.

An insulating layer 14 is provided outside the internal semiconducting layer 12. In general, the insulating layer 14 must have a high breakdown voltage and maintain its insulating performance stably for a long period of time. Furthermore, it must have low dielectric loss and have heat resistance properties such as heat resistance.

The insulation layer of these power cables is mainly made of ground insulation or resin materials (XLPE, etc.).

The insulating layer 14 made of resin is made of polyolefin resin such as polyethylene and polypropylene, and polyethylene resin is preferred. The polyethylene resin may be a crosslinking resin and may be prepared using silane or an organic peroxide, such as dicumyl peroxide (DCP), as a crosslinking agent. The insulating layer 14 of the power cable shown in FIG. 13 shows an example made of XLPE material.

And, an external semiconducting layer 16 is provided outside the insulating layer 14. The outer semiconducting layer 16 is grounded and serves to improve the dielectric strength of the insulating layer 14 by creating an equipotential distribution of electric field lines between the inner semiconducting layer 12 and the aforementioned inner semiconducting layer 12. Additionally, the outer semiconducting layer 16 can prevent corona discharge by smoothing the surface of the insulating layer 14 in the cable and alleviating electric field concentration.

On the outside of the outer semiconducting layer 16, a metal sheath 18 or the like is provided depending on the type of cable. The metal sheath 18 can be used as an electrical shield and a return path for short-circuit current, and the metal sheath 18 can also be replaced with a shielding layer composed of a neutral wire.

An 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 structure of the power cable 100. Therefore, the outer jacket 20 may generally be made of PVC (Polyvinyl chloride) or PE (Polyethylene).

The conductor of the power cable 100 may have a stranded wire structure as described above and may be made of copper or aluminum or their respective alloy materials. Copper has the advantage of good conductivity and aluminum has the advantage of being inexpensive. . And when laying power cables, intermediate connections may be performed at intervals of hundreds of meters or several kilometers.

According to the connecting conductor 500 of the present invention, when the diameters of the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B are different (different diameters and heterogeneous conductors) Bonding of conductors is also possible. With reference to FIG. 14, the connection structure of different diameters and different conductors and the intermediate connection device of the power cable including the same will be described.

Figure 14 shows a cross-sectional view of an intermediate connection device for 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 strand and the second conductor 10B is an aluminum strand.

Referring to FIG. 14, the intermediate connection device 300 includes a first conductor 10A and a second conductor 10B of a pair of the first power cable 100A and the second power cable 100B, the first A connecting conductor 500 joined to the conductor 10A and the second conductor 10B by pressing and welding, respectively, and an insulating layer ( 14A, 14B) and a corona shield 320 configured to surround the conductor joint structure by the connecting conductor 500 and the outside of the pair of first power cables 100A and second power cables 100B. It is made of an elastic resin material that surrounds and can be contracted at room temperature, and may include a sleeve member 360 in the form of a PMJ (Pre-molded Joint). The sleeve member 360 may have a hollow shape.

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

A corona shield 320 may be installed outside the connecting conductor 500. The corona shield 320 extends 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 has a continuous surface without a step with the surfaces of the pair of insulating layers 14A and 14B facing each other. forms to prevent or alleviate electric field concentration. Additionally, it is possible to prevent corona discharge that may occur between the pair of first conductors 10A and second conductors 10B connected by the connecting conductor 500 and the sleeve member 360.

The corona shield 320 also adopts a structure that clamps the ends of the insulating layers 14a and 14b of both power cables, respectively, and provides a tensile force or positioning function when expanding and contracting both power cables or conductors, but does not support the conductors themselves. Since it is not a structure that does this, the connecting conductor of the present invention can provide a structure that supports tension due to expansion and contraction of the power cable or conductor together with the corona shield.

In one embodiment of the present invention, since a pair of cables (100A, 100B) with different diameters are connected, the corona shield 320 is also composed of a structure with different diameters on both sides, and the outer side is a second power cable with a relatively large diameter. The cable 100B may have a structure inclined toward the first power cable 100A, which has a relatively small diameter.

The sleeve member 360 is provided on the outside of the corona shield 320 and has a first end 330A into which the end of the first power cable 100A, which is made of copper and has a relatively small conductor diameter, is inserted. A first electrode 330 made of aluminum and having a second end 330B into which the end of the second power cable 100B with a relatively large diameter is inserted, spaced apart from and facing the first electrode 330. A pair of second electrodes 340 and an insulating layer of the first electrode 330, the second electrode 340, and the pair of first power cables 100A and 100B are provided ( It may include a sleeve insulating layer 350 surrounding (14A, 14B). 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 semiconducting material and is electrically connected to the first conductor 10A and the second conductor 10B of the power cable, thereby serving as a so-called high-voltage electrode. The second electrode 340 is also made of a semiconducting material and is connected to the outer semiconducting layers 16A and 16B of the power cable to serve as a so-called shielding electrode (Deflector). Therefore, the electric field distribution inside the intermediate connection box 300 is distributed between the first electrode 330 and the second electrode 340, and the first electrode 330 and the second electrode 340 are In between, it plays a role in ensuring that the electric field is spread evenly rather than concentrated locally.

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, thereby serving as a so-called high-voltage electrode. The second electrode 340 is also made of a semiconducting material and is connected to the outer semiconducting layers 16A and 16B of the power cable to serve as a so-called shielding electrode (Deflector). Accordingly, the electric field distribution inside the intermediate connection box 300 is distributed between the first electrode 330 and the second electrode 340.

At this time, the first electrode 330 has a distance (D1) from the center of the cable at the position of the first end (330A) to the outer surface and a distance (D2) from the center of the second end (330B) to the outer surface. Equal to each other, the angular distances 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, P2) from the surface of the insulating layers (14A, 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 insulation layers 14A and 14B of the first power cable 100A and the second power cable 100B are separated from the center of the cable. Although the distances to the outer circumferential surfaces are different, the respective distances L1 and L2 from the respective centers to the inner surfaces of the first end 330A and the second end 330B and the respective first power cable 100A and the second power cable By varying the distance (P1, P2) from the surface of the insulating layer (14A, 14B) of (100B) to the outer surface, the first electrode 330 extends from the center of the cable at the first end 330A to the outer surface. The distance D1 and the distance D2 from the center of the second end 330B to the outer surface may be matched.

Furthermore, the intermediate connection device 300 is provided with an enclosure member 200 made of a so-called 'coffin box' or 'metal casing' that surrounds the sleeve member 360. At this time, the space between the housing 200 and the sleeve member 360 may be filled with a waterproofing material (not shown).

Figure 14 is an example of a pair of power cables having conductors of different types and diameters, and is explained by taking an intermediate connection device for connecting power cables having an insulating layer of XLPE material as an example. However, with the conductor connection structure according to the present invention, the conductors The connected power cable may be a geo-insulated cable.

In other words, the heterogeneous conductor connection structure and 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 above-described heterogeneous and heterogeneous conductors, and to the insulation of intermediately connected power cables. In addition to the intermediate connection device in which a corona shield and a sleeve member are mounted on the outside of the conductor connection structure depending on the type of layer, an intermediate device is provided with a reinforcing insulation layer configured to be connected to the ground insulation layer of the double-insulated power cable by wrapping insulation around the outside of the conductor connection structure. It can also be applied to connection devices, and in the case of this ground-insulated intermediate connection device, a rigid intermediate connection device (Rigid Joint) is provided with an enclosure member, or a method in which the enclosure member is omitted and each cable layer is restored outside the reinforcing insulation layer. It should be noted that it can also be applied to flexible joints.

Although this specification has been described with reference to preferred embodiments of the present invention, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims described below. It will be possible to implement it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, it should be considered to be included in the technical scope of the present invention.

10A: 1st conductor
100A: 1st power cable
10B: second conductor
100B: 2nd power cable
300: Intermediate connection device
500: Connecting conductor
510: first metal part
560: second metal part

Claims (13)

In the connecting conductor for joining dissimilar conductors for joining the first conductor constituting the first power cable and the second conductor constituting the second power cable,
a first metal portion made of the same material as the first conductor; and,
A second metal part is joined to the first metal part by friction welding and is made of the same material as the second conductor,
In order to prevent separation of the joint portion of the first metal portion and the second metal portion, the joint portion of the first metal portion and the second metal portion is formed by being joined in a molten state during resistance welding ,
The melting point of the first metal part is higher than the melting point of the second metal part, a protrusion is provided on the joining surface of the second metal part, and the protrusion of the second metal part is seated on the joining surface of the first metal part to cause friction. A connecting conductor for joining dissimilar conductors, characterized in that a locking groove is formed on the insertion portion to be welded and the inner peripheral surface of the insertion portion of the first metal portion through which the second metal portion can be melted and introduced in friction welding to form a locking protrusion. delete According to paragraph 1,
A connection for joining dissimilar conductors, wherein the insertion portion of the first metal portion and the protrusion of the second metal portion are configured in a trapezoidal shape, and the thickness of the protrusion of the second metal portion is greater than the depth of the insertion portion of the first metal portion. conductor. According to paragraph 3,
A connecting conductor for joining dissimilar conductors, wherein the width of the inner end of the insertion part of the first metal part is larger than the width of the outer end of the protruding part of the second metal part. delete According to paragraph 1,
A connecting conductor for joining dissimilar conductors, characterized in that the locking groove formed in the insertion part of the first metal part is formed in a ring shape in the circumferential direction of the inner peripheral surface of the insertion part. According to paragraph 1,
A connecting conductor for joining dissimilar conductors, characterized in that the first conductor of the first power cable is inserted and pressed into the first metal part of the connecting conductor and joined. According to paragraph 1,
A connecting conductor for joining dissimilar conductors, characterized in that the second metal portion of the connecting conductor is joined to the second conductor of the second power cable by Mig welding. According to paragraph 1,
The first conductor of the first power cable and the first metal part of the connecting conductor are made of copper or a copper alloy material, 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. A connecting conductor for joining heterogeneous conductors. A connecting conductor for joining dissimilar conductors according to any one of claims 1, 3, 4, and 6 to 9 ;
a first conductor of the first power cable joined to the first metal portion of the connecting conductor;
a second conductor of the second power cable joined to the second metal portion of the connecting conductor;
a corona shield connecting ends of the insulating layers of the first power cable and the second power cable and surrounding the heterogeneous conductor connection structure;
A sleeve member mounted on the outside of the corona shield and made of an elastic resin material in the form of a PMJ (Pre molded joint); and,
An intermediate connection device for a heterogeneous conductor power cable including an enclosure member mounted on the outside of the sleeve member. A connecting conductor for joining dissimilar conductors according to any one of claims 1, 3, 4, and 6 to 9 ;
a first conductor of the first power cable joined to the first metal portion of the connecting conductor;
a second conductor of the second power cable joined to the second metal portion of the connecting conductor;
An intermediate connection device for 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 by wrapping around the connecting conductor. In the method of manufacturing a connecting conductor for joining dissimilar conductors for joining a first conductor constituting a first power cable and a second conductor constituting a second power cable,
A first metal part in the form of a bar having an insertion part is fixed on the joint surface, and a second metal part in the form of a bar is provided with a protrusion on the joint surface and is made of a metal material with a lower melting point than the first metal part and rotated while in contact with the second metal part. 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 joint surface of the first metal part;
A welding surface forming step of forming a welding surface for joining the second conductor of the second power cable by a Mig welding method on a side opposite to the joining surface of the second metal part,
The melting point of the first metal part is higher than the melting point of the second metal part, and in the friction welding step, the second metal part is melted and introduced into the locking groove formed on the inner peripheral surface of the insertion part of the first metal part to form a locking protrusion during the friction welding process. A method of manufacturing a connecting conductor for joining heterogeneous conductors, characterized in that it is performed to form . delete

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