TWI731316B - Connection conductor for connecting different conductors and connection structure of power cables - Google Patents

Abstract

The present invention relates to a connection conductor, for connection of different conductors, which is capable of simplifying a process of manufacturing a connection conductor in a metal bonding form serving as a bonded part between different conductors and a process of bonding a conductor of a power cable and the connection conductor, minimizing a length of a bonded part between conductors, and improving mechanical bonding strength of the connection conductor; and a connection structure of power cables.

Description

Connection structure for connecting conductors and power cables for connecting different conductors

The present invention relates to a connection conductor for connecting different conductors, a method of manufacturing the connection conductor, and a connection structure of a power cable. In particular, the present invention relates to a connecting conductor for connecting different conductors and a connecting structure of a power cable, wherein the connecting conductor can achieve the following effects: simplify the manufacturing process of connecting conductors in the form of metal joints as connecting parts between different conductors , And simplify the process of bonding the conductor and the connecting conductor of the power cable, minimize the length of the connecting part between the conductors, and improve the mechanical bonding strength of the connecting conductor.

A power cable for power supply can include a conductor, insulation layer, semiconducting layer, outer jacket, etc. made of copper or aluminum.

A cable used to transmit power contains conductors and insulators. The conductor needs to have high conductivity to minimize the loss of electrical energy. Copper and aluminum are conductive materials with high conductivity and high competitive prices. In addition to density, copper is superior to aluminum in terms of electrical and mechanical properties. Therefore, copper is generally suitable for conductors of power transmission cables, while aluminum conductors are only suitable for overhead transmission cables that must have a low weight.

Due to the increase in the price of copper raw materials, for the same weight of copper and aluminum, the price of copper is four to six times higher than the price of aluminum. Therefore, the demand for aluminum conductors for power transmission has increased. Because copper has been commonly used in existing cable conductors, as aluminum conductors are widely used, the demand for intermediate connectors for connecting power cables with copper conductors and power cables with aluminum conductors will increase.

Prior art such as Korean Patent Document No. 1128106 discloses a method of connecting conductors by a dedicated sleeve type connection conductor, and this connection conductor is used for power cables with copper conductors and those with aluminum conductors. The intermediate connector of the power cable. The connecting conductor may be formed of a joint metal with a socket and a joint surface, wherein a first conductor formed of copper and the like is inserted into the socket, and the joint surface is welded by inert gas (Mig welding) and aluminum The formed second conductor is welded together.

The connection conductor may be formed of a first metal and a second metal. Friction welding may be used to join the first conductor and the second conductor to each other. The first conductor formed of copper or the like is inserted and pressed into the hole formed on one side of the connecting conductor, and the second conductor formed of aluminum is joined to the other formed on the connecting conductor by welding or other similar methods. Joint surface on one side. Therefore, three methods such as pressing, resistance welding, and Mig welding are used to connect the first conductor and the second conductor, and the welding thus makes the work cumbersome and increases the manufacturing cost.

Alternatively, the connecting conductor may be formed of the first metal and the second metal. Friction welding can be regarded as a method of joining the first conductor and the second conductor to each other, but the first conductor and the second conductor are different types of conductors and have different melting points, so the physical bonding reliability of the joint between them (physical bonding reliability) is not high. Therefore, it is difficult to ensure that the interface between the first metal and the second metal has sufficient mechanical strength.

The present invention relates to a connecting conductor for connecting different conductors and a connection structure of a power cable, wherein the connecting conductor can achieve the following effects: simplify the manufacturing process of the connecting conductor in the form of metal bonding as the connecting part between the different conductors, and simplify The process of bonding the conductor and the connecting conductor of the power cable, minimizing the length of the connecting parts between the conductors, and improving the mechanical bonding strength of the connecting conductor.

In order to achieve these goals, the present invention provides a connecting conductor for connecting a plurality of different conductors. The connecting conductor connects the first conductor of the first power cable and the second conductor of the second power cable. The connecting conductor includes: The first metal part for joining the first conductor, the first metal part and the first conductor are formed of the same material; and the second metal part for joining with the second conductor, the second metal part and the second conductor are made of the same A material is formed in which the joint surface of the first metal part and the joint surface of the second metal part are joined to each other by friction welding.

And the joining surface of the first metal part and the first conductor may be a vertical surface to join the first metal part and the first conductor by resistance welding.

And the joining surface of the second metal part to the second conductor may be a vertical surface to connect the second metal part and the second conductor by resistance welding.

And the first conductor may be formed of copper or copper alloy, the second conductor may be formed of aluminum or aluminum alloy, and the outer diameter of the first conductor may be less than or equal to the outer diameter of the second conductor.

And the first metal part may include an inclined part, the inclined part has a tapered outer diameter, so that the area of the joint surface of the first conductor that is joined to the first metal part is smaller than the area of the joint that is joined to the second metal part in the first metal part The area of the face.

And the first metal part may be higher than the melting point of the second metal part, the convex part may be provided on the joint surface of the second metal part, and the socket may be formed on the joint surface of the first metal part, and the first metal part and the second metal part The metal part can be friction welded by inserting the convex part into the socket.

And the outer shapes of the insertion hole of the first metal part and the convex part of the second metal part are trapezoidal, and the thickness of the convex part of the second metal part may be greater than the depth of the insertion hole of the first metal part.

And the width of the inner end of the insertion hole of the first metal part may be greater than the width of the outer end of the convex part of the second metal part.

And the stop groove may be provided on the inner peripheral surface of the insertion hole of the first metal part, and when the second metal part melts and flows into the stop groove during the friction welding process, the stop protrusion may be formed in the stop groove. Block in the groove.

And the stop groove of the insertion hole of the first metal part may form a ring shape in the circumferential direction of the inner peripheral surface of the insertion hole.

And in order to achieve these goals, the present invention provides a connection structure for a power cable, including: the connecting conductors for connecting different conductors as described above; the first conductor of the first power cable, the first conductor is used for resistance welding To join with the first metal part of the connecting conductor; the second conductor of the second power cable, the second conductor is used to join with the second metal part of the connecting conductor by resistance welding; corona shield, used to connect the first power One end of the insulation layer of the cable and one end of the insulation layer of the second power cable, and the corona shield covers the connection structure for connecting different conductors; the sleeve member is installed on the outside of the corona shield and is pre-designed An elastic resin material in the form of a pre-molded joint (PMJ) is formed; and a shell member for mounting on the outside of the sleeve member.

And in order to achieve these goals, the present invention provides a connection structure of multiple power cables with different multiple conductors, including: the connecting conductors for connecting different conductors as described above; the first conductor of the first power cable, the first conductor To join with the first metal part of the connecting conductor by resistance welding; the second conductor of the second power cable, the second conductor for joining with the second metal part of the connecting conductor by resistance welding; and to strengthen the insulation layer , Formed by winding the insulating layer of the first power cable, the insulating layer of the second power cable and the connecting conductor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to this, and can be implemented in many different forms. On the contrary, the embodiments described here make this disclosure thorough and complete, and fully convey the scope of the present invention to those skilled in the art. Throughout the specification, the same reference numerals indicate the same elements.

According to the environment in which the power cable is installed (land or submarine), factors such as cost can be considered to change the suitability of the conductor of the power cable. When the power cable contains different types of conductors according to the characteristics of the power cable conductors required by the units of sections, intermediate connections can be performed.

Generally speaking, in order to achieve the flexibility of a power cable, a stranded conductor formed by winding multiple conductor wires is used instead of a whole conductor.

When there are different types of conductors, and these conductors are stranded wire conductors, these conductors may be joined to each other using connecting conductors 500 of a separate whole conductor type. The connecting conductor 500 may be a metal bonding form obtained by bonding different metals to each other.

FIGS. 1 to 5 illustrate the bonding process of connecting conductors 500 for connecting different conductors according to an embodiment of the present invention, and separately connecting the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B The process of bonding to the two outer bonding surfaces of the connecting conductor 500.

In detail, FIG. 1 illustrates the first metal portion 510 and the second metal portion 560 of the connecting conductor 500 according to an embodiment of the present invention.

Each of the first metal part 510 and the second metal part 560 may be formed of a bar type whole metal.

The first metal part 510 may be formed of the same material as the first conductor 10A of the first power cable 100A, and the first metal part 510 may be formed of copper or a copper alloy. The second metal part 560 may be formed of the same material as the second conductor 10B of the second power cable 100B, and the second metal part 560 may be formed of aluminum or aluminum alloy.

Since the conductivity of a copper conductor is better than that of an aluminum conductor, the cross-sectional area or outer diameter of the first conductor 10A connected to the first metal part 510 can be less than or equal to that of the second conductor 10B connected to the second metal part 560 Cross-sectional area or outer diameter. For the description that the cross-sectional area or outer diameter of the first conductor 10A connected to the first metal portion 510 in the connecting conductor 500 is equal to the cross-sectional area or outer diameter of the second conductor 10B connected to the second metal portion 560, reference will be made to FIG. 15 And Figure 16 are described below.

Therefore, as shown in FIG. 1, the first metal portion 510 may include an inclined portion 512, and the inclined portion 512 has a tapered outer diameter, so that the first metal portion 510 is connected to the first conductor 10A on the surface of the metal portion. The area is smaller than the area of the joint surface of the first metal part 510 and the second metal part 560.

The entire outer peripheral surface of the first metal part 510 may be regarded as an inclined plane, but the inclined part 512 may be provided only on a part of the first metal part 510 to ensure that the first metal part 510 is in the friction welding process. The place with a higher melting point can be fixed and supported.

FIG. 2 illustrates the operation process of joining the first metal part 510 and the second metal part 560 to each other by friction welding, thereby manufacturing the connecting conductor 500.

Friction welding is a welding method for fixing an object to be joined. In friction welding, another object is rotated at a high speed to press the other object onto the fixed object, and friction welding is also called friction pressure welding.

The present invention provides a connecting conductor 500 for connecting different conductors, and the connecting conductor 500 is used for joining the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B; the connecting conductor 500 includes the first conductor 10A and the second conductor 10B of the second power cable 100B. The first metal part 510 joined to the conductor 10A and the second metal part 560 joined to the second conductor 10B, wherein the first metal part 510 and the first conductor 10A are formed of the same material, and the second metal part 560 and the second conductor 10B is formed of the same material. The joining surface 514 of the first metal portion 510 and the joining surface 564 of the second metal portion 560 are friction-welded.

That is, by fixing the first metal part 510 and rotating the second metal part 560 at a high speed, the joint surface 514 of the first metal part 510 and the joint surface 564 of the second metal part 560 can face each other and be guided. Friction welding is carried out while in contact with each other.

During the friction welding process, a side surface 516 opposite to the joining surface 514 of the first metal part 510 and a side surface 566 opposite to the joining surface 564 of the second metal part 560 may be pressurized.

3 and 4, when the connecting conductor 500 is completed by friction welding the first metal part 510 and the second metal part 560, the first conductor 10A of the first power cable 100A and the second power cable 100B The two conductors 10B can be guided by the first conductor 10A and the second conductor 10B to contact a side surface 516 of the connecting conductor 500 opposite to the bonding surface 514 of the first metal portion 510 and a side surface 516 opposite to the bonding surface 564 of the second metal portion 560. On the side surface 566, the first conductor 10A and the second conductor 10B are joined to each other by resistance welding.

The first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B may each be a stranded conductor. Because resistance welding can be used to join the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B to the connecting conductor 500, the connecting conductor 500 is opposite to the joint surface 514 of the first metal part 510 Side surface 516, side surface 566 of the connecting conductor 500 opposite to the joint surface 564 of the second metal part 560, the end side of the first conductor 10A of the first power cable 100A, and the end of the second conductor 10B of the second power cable 100B The side joint is preferably arranged perpendicular to the joint direction.

After the resistance welding is completed, the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B may be partially melted and connected to each other, thereby increasing the space on the end side of the first conductor 10A and the second conductor 10B The first conductor 10A and the second conductor 10B are stranded conductors and are joined to opposite sides of the whole conductor type (whole conductor type) connecting conductor 500. .

When the first metal part 510 and the second metal part 560 are connected to the conductor 500 by friction welding as described above, the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B are brought into contact with each other. Connecting to the opposite side surfaces 516 and 566 of the first metal part 510 and the second metal part 560 of the connecting conductor 500, and resistance welding the first conductor 10A and the second conductor 10B, the conductor connection structure can be completed.

That is, according to the present invention, the pressing equipment used for pressing or the welding equipment used for inert gas welding (Mig welding) can be omitted, so that the manufacturing process can be simplified, and the joint surfaces can be arranged perpendicular to The conductor connection direction, while minimizing the length of the conductor connection structure.

6 to 9 illustrate the manufacturing process of connecting conductors for connecting different conductors according to another embodiment of the present invention.

The connecting conductor 500 shown in FIGS. 6 to 9 is the same as the connecting conductor 500 of the embodiment described above with reference to FIGS. 1 to 5, in which the first metal part 510 and the second metal part 560 are of integral conductor type and are joined to each other by friction welding And the first metal part 510 formed of copper has an inclined part on its outer peripheral surface.

In the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B that are joined via the connecting conductor 500 according to an embodiment of the present invention, the first conductor 10A may be a stranded wire made of copper The conductor and the second conductor 10B may be a stranded conductor having a relatively low melting point and made of aluminum.

In the above-mentioned connecting conductor 500 for connecting different metal conductors, the joint surfaces of the opposed flat metal parts are joined by friction welding, so the mechanical joint strength may be weak when the conductor shrinks or expands.

Therefore, according to the present invention, in order to minimize the number of equipment used for manufacturing and bonding, minimize the length of the conductor connection structure, and strengthen the mechanical bonding strength between the metal parts of the connection conductor, the melting point of the first metal part 510 is higher than The melting point of the second metal part 560, so friction welding can be performed, and the joint surface 564 of the second metal part 560 is provided with a convex part 561 and the joint surface 514 of the first metal part 510 is provided with a convex part for the second metal part 560 The structure in which the 561 is inserted into the socket 511 and is engaged between the convex portion 561 and the socket 511 can be used to strengthen the mechanical joint strength during the friction welding process.

As described below with reference to FIG. 8, in the process of manufacturing the connecting conductor 500 of the present invention, the structure to which the first metal portion 510 is fixed is rotated at high speed and joined to the first metal portion 510 and has a second metal having a lower melting point. The portion 560 and the stopper projection 563 formed in the stopper groove 513 during the joining process of the first metal portion 510 and the second metal portion 560 can be used to strengthen the first metal portion The mechanical rigidity and tensile strength of the interface between 510 and the second metal part 560.

In the embodiment of FIGS. 6-9, the convex portion 561 may be provided on the joint surface 564 of the second metal portion 560 formed of aluminum with a low melting point, and the insertion hole 511 into which the convex portion 561 is inserted may be provided with The bonding surface 514 of the first metal portion 510 formed by high melting point copper, and vice versa.

As shown in FIG. 6, the first metal part 510 and the second metal part 560 are pushed toward each other to contact each other, thereby being joined to each other through friction welding.

As shown in FIG. 6, the shape of the insertion hole 511 of the first metal part 510 and the convex part 561 of the second metal part 560 are trapezoidal, and the thickness t2 of the convex part 561 of the second metal part 560 is greater than that of the first metal part 510. The depth of the jack 511 is t1. Therefore, when the insertion hole 511 and the convex portion 561 are guided to contact each other for friction welding, the joining surface 514 of the first metal portion 510 and the joining surface 564 of the second metal portion 560 may not contact each other.

Furthermore, the thickness t2 of the convex portion 561 of the second metal portion 560 is greater than the depth t1 of the insertion hole 511 of the first metal portion 510, and the width d1 of the inner end 511e of the insertion hole 511 of the first metal portion 510 may be greater than that of the second metal portion 510. The width d2 of the outer end 561e of the convex portion 561 of the metal portion 560, so that when the convex portion 561 is inserted into the insertion hole 511, the inner end 511e of the insertion hole 511 of the first metal portion 510 can be guided to be in contact with the second metal portion The outer end 561e of the convex part 561 of 560 contacts.

Therefore, as shown in FIG. 7, when the friction welding starts in a state where the outer end 561e of the convex portion 561 of the second metal portion 560 is in contact with the inner end 511e of the insertion hole 511 of the first metal portion 510, the second metal portion The area of the outer end 561e of the convex portion 561 of the 560 that is in contact with the inner end 511e of the insertion hole 511 of the first metal portion 510 will start to melt.

Next, as shown in FIG. 8, the convex portion 561 of the second metal portion 560 is melted and filled into the insertion hole 511 of the first metal portion 510, thereby joining the joining surface 514 of the first metal portion 510 and the joining surface of the second metal portion 560 564 to form a joining part 530.

In addition, in the present invention, in order to form the joining member 530 by joining the first metal part 510 and the second metal part 560 in a molten state without separating them from each other, a stopper groove 513 may be provided in the first metal part 510 During the friction welding process on the inner peripheral surface of the insertion hole 511, the second metal portion 560 with a low melting point melts and flows into the stop groove 513 to form the stop protrusion 563.

That is, as shown in FIG. 7, when the friction welding starts when the stop groove 513 is provided on the inner peripheral surface of the insertion hole 511 of the first metal part 510, and the second metal part with a low melting point is provided during the friction welding process In the state where the 560 melts and flows into the stop groove 513 to form the stop protrusion 563, as shown in FIG. 8, the second metal part 560 melts and flows into the stop of the inner peripheral surface of the insertion hole 511 of the first metal part 510 A stop protrusion 563 may be formed in the groove 513.

The stop groove 513 forms an annular shape in the circumferential direction of the inner peripheral surface of the insertion hole 511. Therefore, when the convex part 561 of the second metal part 560 melts and flows into the stop groove 513, the stop groove 513 can be used as a The stop structure applies tensile strength in the direction in which the first metal part 510 and the second metal part 560 are separated.

Assuming that when tensile force is applied in the direction that separates the first metal part 510 and the second metal part 560 of the connecting conductor 500 from each other, the stop groove 513 and the stop protrusion 563 provide tensile strength, the stop groove 513 and the stop The protrusion 563 may have various shapes.

As shown in FIGS. 6-9, the stop groove 513 on the inner peripheral surface of the insertion hole 511 of the first metal part 510 may form a ring shape in the circumferential direction of the inner peripheral surface of the insertion hole 511, and may be provided with more One stop slot 513.

As shown in FIG. 8, it is possible to perform friction welding until the joint surface 514 of the first metal part 510 and the joint surface 564 of the second metal part 560 are in close contact with each other, and as shown in FIG. The burrs between the bonding surface 514 and the bonding surface 564 complete the connection of the conductor 500.

FIG. 10 is a cross-sectional perspective view of a power cable 100 having a conductor made of copper or aluminum and an XLPE insulation layer according to an embodiment of the present invention.

Please refer to FIG. 10, the power cable 100 includes a conductor 10 at the center thereof. The conductor 10 serves as a current path and may be formed of copper or aluminum (including aluminum alloy). In order to achieve flexibility, the conductor 10 may be formed of a twisted wire structure formed by winding multiple wires.

The conductor 10 has an uneven surface, which may cause an uneven electric field, so corona discharge may locally occur therein. When a gap is maintained between the conductor 10 and the insulating layer 14 which will be described in detail below, the insulating effect may be deteriorated. In order to solve this problem, an inner semiconductor layer 12 may be provided outside the conductor 10, wherein the inner semiconductor layer 12 is formed of a semiconductor material such as semiconductor carbon paper.

The inner semiconductor layer 12 can homogenize the charge distribution on the surface of the conductor 10 to obtain a uniform electric field, thereby increasing the dielectric strength of the insulating layer 14. In addition, the inner semiconductor layer 12 can prevent a gap between the conductor 10 and the insulating layer 14, thereby preventing corona discharge and ionization.

The insulating layer 14 is formed on the outer side of the inner semiconductor layer 12. Generally speaking, the insulating layer 14 should have a high breakdown voltage and long-term stable insulating effect. In addition, the insulating layer 14 should have low dielectric loss and resistance to heat, such as heat resistance.

The insulating layer of such a power cable is usually formed of paper insulating material or resin material (such as XLPE).

The insulating layer 14 formed of a resin material may be formed of polyolefin resin. The polyolefin resin is, for example, polyethylene or polypropylene, and is made of polyethylene resin. Better. The polyethylene resin can be a cross-linking resin, and silane or organic peroxide such as dicumyl peroxide (DCP) can be used as the cross-linking resin. Coupling reagents to prepare. FIG. 10 shows an example in which the insulating layer 14 of the power cable 100 is formed of XLPE material.

The outer semiconductor layer 16 is provided on the outside of the insulating layer 14. The outer semiconductor layer 16 is grounded so that the distribution of the electric force lines between the outer semiconductor layer 16 and the inner semiconductor layer 12 is equipotential, thereby increasing the dielectric strength of the insulating layer 14. In addition, the outer semiconductor layer 16 can flatten the surface of the insulating layer 14 of the power cable 100 to alleviate electric field concentration, thereby preventing corona discharge.

Depending on the type of power cable 100, a metal sheath 18 or the like is provided on the outside of the outer semiconductor layer 16. The metal sheath 18 can be used for electrical shielding and as a circuit for short circuit, and the metal sheath 18 can be replaced by a shielding layer in the form of a neutral line.

The outer jacket 20 is provided on the outermost side of the power cable 100. The outer jacket 20 may be provided on the outermost side of the power cable 100 to protect the internal structure of the power cable 100. Therefore, the outer jacket 20 can usually be formed of polyvinyl chloride (PVC), polyethylene (PE), or the like.

As described above, the conductor 10 of the power cable 100 may have a stranded wire structure and be formed of copper, aluminum, copper alloy, or aluminum alloy. Copper has good electrical conductivity, while aluminum has an advantage in price. When installing the power cable 100, intermediate connections can be made at intervals of several hundred or several kilometers.

Even when the first conductor 10A and the second conductor 10B have different diameters (the first conductor 10A and the second conductor 10B are different types of conductors with different diameters), the connecting conductor 500 of the present invention can make the first power cable The first conductor 10A of 100A and the second conductor 10B of the second power cable 100B are connected to each other. A connection structure of different types of conductors with different diameters and the connection structure of the power cable containing it will be described below with reference to FIG. 11.

Fig. 11 is a schematic cross-sectional view of a connection structure of a power cable according to an embodiment of the present invention.

In the embodiment in FIG. 11, an example in which the first conductor 10A is a copper stranded conductor and the second conductor 10B is an aluminum stranded conductor will be described below.

Please refer to FIG. 11, the connection structure 300 may include a pair of first and second conductors 10A and 10B of the first power cable 100A and the second power cable 100B, a connection conductor 500, a corona shield 320, and a sleeve member 360. The connecting conductor 500 is joined to the first conductor 10A and the second conductor 10B by resistance welding. The corona shield 320 covers the conductor joint structure formed by the connecting conductor 500, and is connected to the insulating layer 14A and the insulating layer 14B of the pair of the first power cable 100A and the second power cable 100B at the same time. The sleeve member 360 covers the outer sides of the pair of first power cables 100A and second power cables 100B. The sleeve member 360 is formed of an elastic resin material that shrinks or expands at room temperature, and is in the form of a pre-molded joint (PMJ). The sleeve member 360 may have a hollow outer shape.

The connecting conductor 500 of the present invention bidirectionally connects the first conductor 10A and the second conductor 10B of the first power cable 100A and the second power cable 100B. The first metal part 510 and the second metal part 560 can be joined to each other in the following manner: friction welding is performed on the flat joint surface of the first metal part 510 and the second metal part 560, or the joining is performed during the friction welding process. The part forms the structure of the stop groove and the stop convex part.

The corona shield 320 may be provided on the outside of the connecting conductor 500. The corona shield 320 extends from the insulating layer 14A of the first power cable 100A to the insulating layer 14B of the second power cable 100B. In this case, the corona shield 320 has a flat outer surface; the corona shield 320 surrounds the connecting conductor 500, and has a stepless continuous surface with respect to a pair of opposed insulating layers 14A and 14B facing each other. Prevent or slow down electric field concentration. The corona shield 320 can prevent the corona discharge occurring between the pair of first conductor 10A and the second conductor 10B, where the first conductor 10A and the second conductor 10B are connected via the connecting conductor 500 and the sleeve structure 360.

When the first power cable 100A and the second power cable 100B or the first conductor 10A and the second conductor 10B contract or expand, the corona shield 320 has an end for clamping the insulating layer 14A of the first power cable 100A and a second Second, the structure of the end of the insulating layer 14B of the power cable 100B is used to apply tensile strength or provide a position identification function, but the corona shield 320 is not used to support the first conductor 10A and the second conductor 10B. Therefore, when the first power cable 100A and the second power cable 100B or the first conductor 10A and the second conductor 10B contract or expand, the connecting conductor 500 in FIGS. 6 to 9 according to the present invention can be combined with the corona shield 320 Provide a structure for applying tension.

In an embodiment of the present invention, the pair of power cables 100A and 100B with different diameters are connected to each other, so that the opposite sides of the corona shield 320 have different diameters, and the outer side of the corona shield 320 is directed from the second power cable 100B. The first power cable 100A is inclined, wherein the second power cable 100B has a relatively large diameter and the first power cable 100A has a relatively small diameter.

The sleeve member 360 includes a first electrode 330, a second electrode 340 and a sleeve insulating layer 350. The first electrode 330 is arranged on the outside of the corona shield 320 and has a first end 330A formed of a copper material and a second end 330B formed of an aluminum material, and has a relatively small diameter of the conductor 10A. The end of the cable 100A is inserted into the first end 330A, and the end of the second power cable 100B with a relatively large diameter conductor 10B is inserted into the second end 330B; the second electrode 340 faces the first electrode 330 and is connected to the first One electrode 330 is spaced apart; the sleeve insulating layer 350 covers the first electrode 330, the second electrode 340 and the insulating layers 14A and 14B of the pair of the first power cable 100A and the second power cable 100B. The sleeve insulating layer 350 may be formed of ethylene propylene diene monomer (EPDM) or liquid silicon rubber (LSR).

The first electrode 330 is formed of a semiconductor material, and is electrically connected to the first conductor 10A and the second conductor 10B of the power cables 100A and 100B as a so-called high-voltage electrode. Likewise, the second electrode 340 is formed of a semiconductor material, and is connected to the outer semiconductor layers 16A and 16B of the power cables 100A and 100B to serve as a so-called deflector. Therefore, in the connection structure 300, the electric field is distributed between the first electrode 330 and the second electrode 340, and the first electrode 330 and the second electrode 340 uniformly distribute the electric field without local concentration.

In this case, in the first electrode 330, the distance D1 from the center of the first power cable 100A to the outer surface at the position of the first end 330A and the distance D1 from the second power cable 100B at the position of the second end 330B The distance D2 from the center to the outer surface may be the same; the distance L1 from the center of the first power cable 100A to the inner surface at the position of the first end 330A and the distance L1 from the center of the second power cable 100B at the position of the second end 330B The distance L2 to the inner surface can be different, and the distance P1 from the surface of the insulating layer 14A of the first power cable 100A to the outer surface and the distance P2 from the surface of the insulating layer 14B of the second power cable 100B to the outer surface can be different.

The first conductor 10A and the second conductor 10B have different materials and diameters. Therefore, the distance from the center of the first power cable 100A to the outer circumference of the insulating layer 14A of the first power cable 100A is different from the distance from the center of the second power cable 100B to the outer circumference of the insulating layer 14B of the second power cable 100B . Therefore, the distances L1 and L2 from the center of the first power cable 100A and the second power cable 100B to the inner surface of the first electrode 330 at the positions of the first end 330A and the second end 330B, respectively, may be different. And the distances P1 and P2 from the surface of the insulating layers 14A and 14B of the first power cable 100A and the second power cable 100B to the outer surface of the first electrode 330 can be different, so that the distance D1 and the distance D2 are the same , Where the distance D1 is measured from the outer surface of the first electrode 330 to the center of the first power cable 100A according to the position of the first end 330A, and the distance D2 is measured from the first electrode 330 according to the position of the first end 330B. Measured from the outer surface to the center of the second power cable 100B.

The connection structure 300 includes a housing 200, and the housing 200 is a so-called coffin box or a metal shell for covering the sleeve member 360. In this case, the space between the housing 200 and the sleeve member 360 may be filled with waterproof material (not shown) or the like.

For example, in FIG. 11, the connection structure for connecting multiple power cables with XLPE insulation layers is described above, where these power cables are used as one of a pair of power cables with different types of conductors with different diameters. For example, the power cables may be paper insulated cables, in which the conductors of these power cables are connected through the conductor connection structure according to the present invention.

The structure and method for connecting different conductors by the connecting conductor 500 of the present invention is suitable for connecting the above-mentioned different conductors and the connection structure with a reinforced insulation layer, wherein the reinforced insulation layer is formed by wrapping insulating paper or XLPE tape on the outside of the connection structure. Formed, and this connection structure will be connected to the paper insulation layer or XLPE insulation layer of an electrically insulated power cable or an XLPE insulated power cable. This kind of electrical insulation or XLPE insulation connection structure is also suitable for rigid joints with shell elements or flexible joints with shell elements omitted and each cable layer is restored to the outside of the reinforced insulation layer.

Fig. 12 shows a connection structure for connecting a pair of XLPE insulated power cables with conductors having the same diameter but different types according to another embodiment of the present invention.

The elastic joint is suitable for mass-manufacturing power cables and connecting the power cables in the factory. Because the cables are connected in the factory during the process of manufacturing the cables, the elastic joint is also called a factory joint. Therefore, the connecting conductor 500 and the conductor connecting structure of the present invention are suitable for the situation when power cables with different conductors are mass-produced in a factory and connected to each other.

Similarly, as shown in FIG. 12, when the first power cable 100A and the second power cable 100B are connected to each other, and the first power cable 100A and the second power cable 100B have different types of conductors with different diameters and are formed of different materials , The connecting conductor 500 of the present invention can be used to set the connecting structure 300.

In other words, the diameter of the elastic joint is substantially the same as the diameter of the first conductor 10A of the first power cable 100A and the second conductor 10B of the second power cable 100B, and can be formed by the following method: through resistance welding The connecting conductor 500 connects the first conductor 10A and the second conductor 10B to each other. The reinforced insulating layer 314 is formed by wrapping the XLPE tape around the interface between the first conductor 10A and the second conductor 10B, and by putting it back into the insulating layer 14, And in the form of tape and heat shrinkable tube, the semiconductor recovery layer 316, the metal sheath recovery layer 318 and the corona shield 320 located outside the reinforced insulating layer 314 are replaced.

In the embodiment in FIG. 12, the diameters of the first conductor 10A and the second conductor 10B are the same as the diameter of the connecting conductor 500. An embodiment where the diameter of the connecting conductor 500 is the same as the diameter of the first conductor 10A and the second conductor 10B will be described below with reference to FIGS. 15 and 16.

13 and FIG. 14 illustrate the manufacturing process of connecting conductors for connecting different conductors according to another embodiment of the present invention. Part of the manufacturing process that is the same as the manufacturing process of the connecting conductor 500 described above with reference to FIGS. 1, 2 and FIGS. 6-9 will not be repeated here.

The connecting conductor 500 in Figs. 13 and 14 is the same as the connecting conductor 500 in Figs. 1 and 2. It is used to connect the first conductor of the first power cable with different diameters and the second conductor of the second power cable. The joining surface of the first metal portion 510 of the conductor 500 and the joining surface of the second metal portion 560 are flat surfaces. In order to change the diameter of the conductors 10A, 10B of the power cables 100A, 100B, the inclined portion 512 is an inclined surface and is provided on the connecting surface. The outer peripheral surface of the conductor 500. The connecting conductor 500 in FIGS. 13 and 14 is different from the connecting conductor 500 in FIGS. 1, 2, and FIGS. 6-9 in that the inclined portion 512 of the first metal portion 510 is located behind the joint surface 514.

In addition, unlike the connecting conductor 500 in FIGS. 1 and 2, in the connecting conductor 500 in FIGS. 13 and 14, the position of the inclined portion 512 of the first metal portion 510 is changed to prevent bonding failure, for example, when the Failure of the edge of the joint surface 514 of a metal part 510 caused by pressure bending during the friction welding process, and this change is to set a point before or after the first metal part 510, which has a high melting point The first metal part 510 will be fixed or supported at this point for friction welding.

15 and FIG. 16 show a manufacturing process of a connecting conductor 500 for connecting different conductors according to another embodiment of the present invention. Part of the manufacturing process that is the same as the manufacturing process of the connecting conductor 500 described above with reference to FIG. 1, FIG. 2, FIG. 6-9, FIG. 13 and FIG. 14 will not be repeated here.

The previous embodiment relates to the connecting conductor 500 used to connect the first conductor of the first power cable and the second conductor of the second power cable, where the first conductor and the second conductor have different diameters, and in FIGS. 15 and 16 The embodiment of is related to a connecting conductor 500 for connecting a first conductor of a first power cable and a second conductor of a second power cable, wherein the first conductor and the second conductor have the same diameter.

According to the environment in which the power cable is installed, in many cases, power cables formed of different materials and having the same diameter are connected by intermediate connectors. For example, when the installation part of the power cable is located in a submarine or underwater, heat does not cause a problem. Therefore, power cables with conductors made of aluminum can be installed on submarines or underwater parts, and power cables with conductors made of copper can be installed on land. In other words, when power cables with different conductors are installed on the land, the diameter of the conductor depends on whether it generates heat and conducts electricity, but the diameter of the conductor made of aluminum may be reduced in this special environment.

In this case, the conductors of the power cable may be set to have the same diameter, the first metal part 510 and the second metal part 560 of the connecting conductor 500 may be set to have the same diameter, and the inclined part that is an inclined surface may not be provided in the connection. Conductor 500.

Similarly, in the embodiment in FIGS. 15 and 16, a joining member 530 can be provided by the following steps to complete the connection conductor 500: fixing the first metal part 510, rotating and pressing the second metal part 560 , And perform friction welding; or fix the second metal portion 560, rotate and press the first metal portion 510, and perform friction welding, and the foregoing steps are performed in a state where the joint surface 514 and the joint surface 564 are in contact with each other.

As described above, the connection structure for connecting the connecting conductors of different conductors and the power cable according to the present invention can: when the different conductors of the power cable are connected through the connecting conductor in the form of metal bonding, the workability of the connection of the power cable is improved. ); Minimize the length of the conductor connection structure by making the joint surface of the conductor or metal part perpendicular to the direction in which the conductor or metal part is connected, thereby minimizing the length of the power cable connection structure, thereby making the connection structure tight; Different conductors are provided with a structure for engaging with the joining parts to prevent separation of the metal parts of the connecting conductors when the friction welding is performed on the metal parts of the connecting conductors, thereby improving the mechanical joint strength of the joining parts of different conductors.

According to the connection structure of the connecting conductor for connecting different conductors and the power cable according to the present invention, the workability of the power cable connection can be improved when the different conductors of the power cable are connected through the connecting conductor in the form of metal bonding.

In the connection structure for connecting conductors and power cables of different conductors according to the present invention, the length of the conductor connection structure is minimized by making the joint surface of the conductor or metal part perpendicular to the direction in which the conductor or metal part is connected.

The connection structure for connecting conductors and power cables for connecting different conductors according to the present invention can improve the mechanical bonding strength of the bonding parts between different conductors.

Although the exemplary embodiments according to the present invention have been described above, it should be understood that those skilled in the art can make various changes and modifications without departing from the scope and technical concept of the present invention. Therefore, as long as the elements are included in the scope of the present invention, all modifications are included in the technical scope of the present invention.

10: Conductor 12: Inner semiconducting layer 14: Insulating layer 16: Outer semiconductor layer 18: metal sheath 20: outer jacket 100: Power cable 100A: First power cable 100B: second power cable 10A: first conductor 10B: second conductor 500: connecting conductor 510: first metal part 511: jack 511e: inner end of jack 512: inclined part 513: Stop groove 514: Joint surface 516: One side of the joint surface of the first metal part 530: Joining member 560: Second metal part 561: convex part 561e: outer end of the convex part 563: Stop protrusion 564: Joint surface 566: One side of the joint surface of the second metal part 200: shell 300: connection structure 314: Reinforced insulating layer 316: Semiconductor recovery layer 318: metal sheath recovery layer 320: corona shielding 330: first electrode 330A: first end 330B: second end 340: second electrode 350: Sleeve insulation layer 360: Sleeve member t1: the depth of the hole t2: the thickness of the convex part d1: the width of the inner end d2: the width of the outer end P1, P2: the distance from the surface of the insulating layer to the outer surface D1, D2: the distance from the center of the power cable to the outer surface L1, L2: the distance from the center of the power cable to the inner surface

FIGS. 1 to 5 illustrate a bonding process for connecting connecting conductors of different conductors according to an embodiment of the present invention, and bonding the first conductor of the first power cable and the second conductor of the second power cable to the connecting conductor, respectively The manufacturing process of the first metal part and the second metal part. 6 to 9 illustrate the manufacturing process of connecting conductors for connecting different conductors according to another embodiment of the present invention. 10 is a cross-sectional perspective view of a power cable with a conductor made of copper or aluminum and an XLPE insulation layer according to an embodiment of the present invention. Fig. 11 is a schematic cross-sectional view of a connection structure of a power cable according to an embodiment of the present invention. Fig. 12 shows a connection structure for connecting a pair of XLPE insulated power cables with conductors having the same diameter but different types according to another embodiment of the present invention. 13 and FIG. 14 show a process of connecting conductors for connecting different conductors according to another embodiment of the present invention. 15 and FIG. 16 show a process of connecting conductors for connecting different conductors according to another embodiment of the present invention.

500: connecting conductor

510: First Metal Division

512: Inclined part

513: Stop Groove

516: One side of the joint surface of the first metal part

530: Joining Parts

560: The second metal part

561: Convex

563: stop convex

566: One side of the joint surface of the second metal part

Claims (8)

A connecting conductor is used to connect a plurality of different conductors. The connecting conductor connects a first conductor of a first power cable and a second conductor of a second power cable. The connecting conductor includes: a first metal part, For joining with the first conductor and formed of the same material as the first conductor; and a second metal part for joining with the second conductor and formed of the same material as the second conductor, wherein , A joint surface of the first metal part and a joint surface of the second metal part are joined to each other by friction welding, wherein the first conductor is formed of copper or a copper alloy, and the second conductor is formed of aluminum or a copper alloy. Is formed of aluminum alloy, an outer diameter of the first conductor is less than or equal to an outer diameter of the second conductor, and the first metal portion includes an inclined portion having a tapered outer diameter so that the second conductor The area of a joint surface of a conductor that is joined to the first metal portion is smaller than the area of the joint surface of the first metal portion that is joined to the second metal portion, and one of the protrusions is provided on the second metal portion The joining surface, an insertion hole is formed on the joining surface of the first metal part, wherein the first metal part and the second metal part are friction welded by inserting the convex part into the insertion hole, wherein the second metal A thickness of the convex portion of the portion is greater than a depth of the insertion hole of the first metal portion, A width of an inner end of the insertion hole of the first metal part is greater than a width of an outer end of the convex part of the second metal part, and one of the stop grooves is provided in the insertion hole of the first metal part. An inner peripheral surface of the hole, wherein during the friction welding process, when the second metal part melts and flows into the stop groove, a stop protrusion is formed in the stop groove. The connecting conductor according to claim 1, wherein a joining surface of the first metal part to be joined to the first conductor is regarded as a vertical surface to join the first metal part and the first conductor by resistance welding . The connecting conductor according to claim 1, wherein a joint surface of the second metal part to be joined to the second conductor is regarded as a vertical surface to join the second metal part and the second conductor by resistance welding. The connecting conductor according to claim 1, wherein the insertion hole of the first metal part and the convex part of the second metal part have a trapezoidal cross section. The connecting conductor according to claim 1, wherein the stop groove of the insertion hole of the first metal part forms a ring shape in a circumferential direction of the inner peripheral surface of the insertion hole. A connecting conductor is used to connect a plurality of different conductors. The connecting conductor connects a first conductor of a first power cable and a second conductor of a second power cable. The connecting conductor includes: a first metal part, For joining with the first conductor, and formed of the same material as the first conductor; and A second metal part for joining with the second conductor and formed of the same material as the second conductor, wherein a joining surface of the first metal part and a joining surface of the second metal part are formed by They are joined by friction welding, wherein the first conductor is formed of copper or a copper alloy, the second conductor is formed of aluminum or an aluminum alloy, and an outer diameter of the first conductor is less than or equal to that of the second conductor. Outer diameter, wherein the first metal portion includes an inclined portion, the inclined portion has a tapered outer diameter and is located behind the joint surface, so that the first conductor and the first metal portion of a joint surface The area is smaller than the area of the joint surface of the first metal part and the second metal part. A connection structure of a power cable, comprising: the connecting conductor as described in any one of claims 1 to 6 for connecting a plurality of different conductors; a first conductor of a first power cable, the first conductor Used for joining with the first metal part of the connecting conductor by resistance welding; a second conductor of a second power cable, the second conductor used for joining with the second metal of the connecting conductor by resistance welding Part joint; a corona shield for connecting an end of an insulating layer of the first power cable and an end of an insulating layer of the second power cable, and the corona shielding covering is used to connect the different ones The connection structure of the conductor; A sleeve member installed on an outer side of the corona shield and formed of an elastic resin material in the form of a pre-molded joint (PMJ); and a shell member for installing on the sleeve One outside of the component. A connection structure for a plurality of power cables with different conductors, comprising: the connecting conductor as described in any one of claims 1 to 6 for connecting the different conductors; a first power cable A first conductor used for joining with the first metal part of the connecting conductor by resistance welding; a second conductor of a second power cable used by resistance welding Joined with the second metal portion of the connecting conductor; and a reinforced insulating layer formed by wrapping an insulating layer of the first power cable, an insulating layer of the second power cable, and the connecting conductor.

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