KR20220098828A - Different Type Power Cable Core Connecting Device And Different Type Power Cable Connecting System - Google Patents

Abstract

The present invention relates to a heterogeneous power cable core connection device and a heterogeneous power cable connection system having the same, wherein the volume of a connection device for connection of a heterogeneous power cable core is minimized, a metal shielding layer is easily formed on the outer circumferential surface of an epoxy molding part constituting an epoxy connection sleeve in which a connection conductor is embedded, and the metal shielding layer is not easily removed.

Description

A heterogeneous power cable core connecting device and a heterogeneous power cable connecting system having the same {Different Type Power Cable Core Connecting Device And Different Type Power Cable Connecting System}

The present invention relates to a heterogeneous power cable core connection device and a heterogeneous power cable connection system having the same. More specifically, the present invention minimizes the volume of a connection device for connection of heterogeneous power cable cores, and easily forms a metal shielding layer on the outer circumferential surface of the epoxy molding part constituting the epoxy connection sleeve in which the connection conductor is embedded, and the metal shielding layer It relates to a heterogeneous power cable core connection device that is not easily removed and a heterogeneous power cable connection system having the same.

The power cable has an insulating layer on the outside of the conductor, and may be classified into a ground-insulated (OF, POF, MI, etc.) power cable and an XLPE insulated power cable having a ground-insulating insulating layer according to the type of the insulating layer.

In addition, the power cables should be connected through the intermediate junction box at predetermined intervals. In the case of cables with the same type of insulation layer, intermediate connection of power cables is performed by applying each dedicated intermediate junction box.

The conductor connection part of earth insulated power cable and XLPE insulated power cable is composed of a reinforced insulating layer composed of winding insulating paper based on the boundary area, and epoxy molding or PMJ (PRE-MOLDED JOINT) rubber, which surrounds the connecting conductor. The sleeve member is mounted to have a structure to reinforce the insulation performance at the conductor connection portion.

However, in the case of intermediately connecting the earth insulated power cable and the XLPE insulated power cable, one side of the sleeve conductor for connecting the conductors of both power cables is configured as a high-pressure oil filling environment.

Therefore, in the intermediate connection device for intermediately connecting the earth insulated power cable and the XLPE insulated power cable, the earth insulated power cable area and the XLPE insulated power cable area should be spatially separated.

1 is an intermediate insulated power cable 100A having a three-phase core 100a of a high-pressure, fluid-filled (HPFF) pipe type and an XLPE power cable 100B having a three-phase core 100b. It shows a heterogeneous power cable connection device 1000' for connection.

In the case of intermediate connection between the HPFF (high-pressure, fluid-filled) pipe type 3-phase earth-insulated power cable (100A) and the pipe type 3-phase XLPE insulated power cable (100B), the earth-insulated power cable area ( A), unlike the XLPE insulated power cable region (B), has a structure in which a high-pressure fluid is accommodated, a housing having an enlarged diameter than a pipe, and a flange member 500 provided with a connecting conductor is interposed in the boundary region.

In addition, it may be configured in such a way that a plurality of reinforcing insulating layers 140a and pre-mold joints 140b are provided for each phase in the housings 200a and 200b constituting each cable area.

The heterogeneous power cable connection device 1000 ′ having this type of housings 200a and 200b has a larger diameter than the high-pressure pipe constituting the cable and the inside is filled with high-pressure insulating oil, so the volume of the connection system is large and heavy, and the inside of the manhole There is a problem in that it is not easy to connect and install in pipelines, etc.

In order to solve this problem, a method of separating the different power cable core connection devices by phase can be considered. It is difficult to connect and install in underground pipelines, etc. because the size of the PMJ for insulation with PMJ (PRE-MOLDED JOINT) for insulation increases.

Therefore, an epoxy connection sleeve in which a connection conductor is embedded can be considered as an insulating means for separating the heterogeneous power cable core connection device by phase but insulating the XLPE power cable connection part.

Such a heterogeneous power cable core connection device may be provided with an epoxy connection sleeve consisting of a reinforced insulating layer and an epoxy molding part configured by transversely winding insulating paper in each cable connection part, respectively, an insulating layer may be provided, and a reinforced insulating layer through the insulating paper and The boundary region of the epoxy molding part of the epoxy connection sleeve may be disposed inside the insulating oil.

The external semiconducting restoring layer restored outside the reinforcing insulating layer accommodated in the insulating oil restores the outer semiconducting layer by winding carbon paper of paper material, but the epoxy molding part has a large change in the inclination angle of the outer circumferential surface and its shape is complicated, so it is difficult to wind the carbon paper, etc., and insulating oil Since there is a problem that a semiconducting tape cannot be used because it is inside, it is not easy to form an external semiconducting layer or a metal shielding layer on the outer peripheral surface of the epoxy molding part.

The present invention minimizes the volume of a connection device for connection of heterogeneous power cable cores, and easily forms a metal shielding layer on the outer peripheral surface of the epoxy molding part constituting the epoxy connection sleeve in which the connection conductor is embedded, and the metal shielding layer is not easily removed. An object to be solved is to provide a heterogeneous power cable core connection device and a heterogeneous power cable connection system having the same.

In order to solve the above problems, the present invention provides a heterogeneous power cable core connection device for connecting a ground insulation power cable core and an XLPE power cable core, a conductor and one end of the ground insulation power cable core are connected, and an XLPE power cable core an epoxy connection sleeve including a connection conductor to which the conductor and the other end are connected, and an epoxy molding part surrounding the connection conductor; A part of the insulating layer constituting the earth-insulated power cable core, the outside of the conductor connection part to which the conductor of the earth-insulated power cable core and one end of the connection conductor are connected, and at least a part of the epoxy molding sleeve are wrapped with insulating paper. floor; a stress relief cone mounted between the rear inner side of the epoxy connection sleeve and the outer peripheral surface of the XLPE power cable core; an elastic support unit mounted on the rear of the stress relief cone to elastically support the stress relief cone in the direction of the epoxy connection sleeve; It is possible to provide a heterogeneous power cable core connecting device, characterized in that the outer peripheral surface of the area is not provided with a metal shielding layer.

In addition, the metal shielding layer may be a silver powder coating film formed by applying silver powder to the outer peripheral surface of the epoxy molding part.

In this case, an epoxy coating film formed by coating an epoxy on the outer surface of the silver powder coating film may be added.

And, the connection conductor constituting the epoxy connection sleeve may include a copper conductor part connected to the conductor of the ground-insulated power cable core and an aluminum conductor part bonded to the copper conductor part and buried inside the epoxy molding part. can

In addition, in order to solve the above problems, the present invention is a plurality of earth insulated power cable core is accommodated, the main pipe is filled with insulating oil at a high pressure; a plurality of branch pipes branched from the main pipe into a plurality of branch pipes each accommodating a ground-insulated power cable core; And, one end is connected to the plurality of branch pipes, and a plurality of heterogeneous power cable core connecting device for connecting each of the plurality of earth-insulated power cable cores to the plurality of XLPE power cable cores branched from the XLPE power cable at the other end, respectively. It is possible to provide a heterogeneous cable connection system including;

According to the heterogeneous power cable core connection device and the heterogeneous power cable connection system having the same according to the present invention, the core connection device for connecting the heterogeneous power cables having a plurality of phase cores for each phase is applied and installed in a narrow space such as a manhole This is possible and workability can be improved.

In addition, according to the heterogeneous power cable core connection device and the heterogeneous power cable connection system having the same according to the present invention, the volume of the core connection device for each phase can be minimized by omitting the pre-mold joint in the core connection device for connecting the cores for each phase. .

In addition, according to the heterogeneous power cable core connection device and the heterogeneous power cable connection system having the same according to the present invention, a metal shielding layer is easily formed on the outer circumferential surface of the epoxy molding part constituting the epoxy connection sleeve in which the connection conductor is embedded, and the metal shielding It can prevent the layer from being easily removed.

1 is a high-pressure, fluid-filled (HPFF) pipe type 3-phase earth-insulated power cable (hereinafter, referred to as 'interrupted-insulated power cable') and a pipe type 3-phase XLPE insulated power cable (XLPE power cable) It shows a heterogeneous power cable core connecting device for intermediate connection.
2 shows a heterogeneous cable connection system according to the present invention.
Figure 3 shows a cross-sectional view of the heterogeneous power cable core connecting device constituting the heterogeneous cable connecting system according to the present invention shown in Fig. 2 .
Figure 4 shows a cross-sectional view of the epoxy connection sleeve constituting one embodiment of the heterogeneous power cable core connection device according to the present invention.
5 is a cross-sectional view of an epoxy connection sleeve constituting another embodiment of the heterogeneous power cable core connection device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed subject matter may be thorough and complete, and the spirit of the invention may be sufficiently conveyed to those skilled in the art. Like reference numbers refer to like elements throughout.

2 shows a heterogeneous cable connection system 1000 according to the present invention, and FIG. 3 is a heterogeneous power cable core connection device 300a, 300b constituting the heterogeneous cable connection system 1000 according to the present invention shown in FIG. , 300c) shows a cross-sectional view.

The heterogeneous cable connection system 1000 according to the present invention is a high-pressure, fluid-filled (HPFF) pipe type 3-phase earth-insulated power cable (100x, hereinafter, referred to as 'interrupted-insulated power cable') and 3-phase XLPE insulation In order to intermediately connect the power cables (100y, XLPE power cables), as many as the number of connection parts of the cable cores (110x, 110y) to be connected instead of a single device, the different power cable core connection devices (300a, 300b, 300c) are used. It can perform heterogeneous cable connection.

As shown in FIG. 2 , the HPFF (high-pressure, fluid-filled) pipe type 3-phase earth-insulated power cable 100x has a 3-phase earth-insulated cable core in a state in which high-pressure insulating oil is filled in the high-pressure pipe 180 . (110xa, 110xb, 110xc) is accommodated, the connected XLPE insulated power cable is a three-phase XLPE cable core (110ya, 110yb, 110yc) is accommodated in the cable jacket 170, the heterogeneous cable connection system 1000 according to the present invention ), the core of each phase can be connected to each phase.

Accordingly, the high-pressure, fluid-filled (HPFF) pipe type three-phase earth-insulated power cable 100x divides the high-pressure pipe 180 into the three branch pipes 118a, 118b, and 118c. branching through, and in each branch pipe 118a, 118b, 118c, a ground-insulated cable core may be accommodated.

Each branch pipe (118a, 118b, 118c) accommodated in each branch pipe (118a, 118b, 118c) is a three-phase XLPE cable core ( 110ya, 110yb, 110yc) and may be connected to each other. The three-phase XLPE cable may be in a form in which the three-phase XLPE cable core (110ya, 110yb, 110yc) is accommodated in the cable jacket 170, so each core (110ya, 110yb, 110yc) is a heterogeneous power cable core connection device (300a, 300b) , 300c), the cable jacket 170 may be removed and each core may be branched to connect to the heterogeneous power cable core connecting devices 300a, 300b, and 300c.

In the conventional three-phase heterogeneous power cable core connection device described with reference to FIG. 1, the connection part of each core becomes one connection device, and one side of the boundary area is filled with high-voltage insulating oil, so the volume and weight are large. It was very difficult to work and install space inside an underground pipe or manhole, but as shown in FIG. 2, even in a heterogeneous three-phase power cable, a heterogeneous power cable core connection device 300 for each core 110 was applied. Since the connection device 300 for each phase is divided and installed inside the conduit, it can be installed in a narrow space inside the underground conduit.

The heterogeneous power cable core connecting devices 300a, 300b, and 300c shown in FIG. 3 have one end connected to the conductor of the ground insulated power cable, and the connecting conductor 321 to which the conductor and the other end of the XLPE power cable are connected, and the connecting conductor (321) an epoxy connection sleeve 320 including an epoxy molding part 326 surrounding the outer periphery; A part of the insulating layer for insulating the conductor, the conductor 101x of the ground-insulated power cable core, the outside of the conductor connection part to which one end of the connection conductor 321 is connected, and at least a part of the epoxy connection sleeve 320 are insulated paper a reinforcing insulating layer 310 wrapped around; a stress relief cone 350 mounted between the rear inner side of the epoxy connection sleeve 320 and the outer circumferential surface of the XLPE power cable; The stress relief cone 350 is mounted to the rear of the elastic support unit 360 for elastically supporting the stress relief cone 350 in the direction of the epoxy connection sleeve 320; may be configured to include.

The epoxy connection sleeve 320 may be provided by embedding a connection conductor 321 to which the conductors 101x and 101y of the heterogeneous cable cores 110 and 110y are respectively connected therein.

At one end of the connection conductor 321, a conductor 101x constituting the core 110x of the ground-insulated power cable is mounted and crimped, and the other end is connected to a conductor 101y constituting the core 110Y of the XLPE power cable. can be

The epoxy connection sleeve 320 is a space filled with insulating oil among the inner space of the housing constituting the heterogeneous cable connection device 300 at the same time that the conductors 101x and 101y of the heterogeneous cable core to be connected are connected, and an XLPE power cable core to be described later. It is possible to perform a function of partitioning an area in which the stress relief cone 350 for electric field relaxation is installed.

The left region in FIG. 3 is a region in which insulating oil is filled with high pressure in the housing, and may communicate with the branch pipe 118 branched from the high pressure pipe 180 shown in FIG. 2 .

A reinforcing insulating layer 310 is formed by winding insulating paper around one end of the connecting conductor 321 of the epoxy connecting sleeve 320 and the connecting portion of the conductor constituting the core 110x of the ground-insulated power cable to reinforce the insulation of the connecting portion. An external semi-conductive restoration layer (not shown) formed by winding carbon paper on the outside of the reinforcing insulating layer 310 may be provided.

The reinforcing insulating layer 310 includes an insulating layer 140x constituting the earth-insulated power cable core, a conductor 101x of the earth-insulated power cable core, and a conductor connecting portion to which one end of the connecting conductor 321 is connected, and the epoxy By wrapping at least a portion of the connection sleeve 320 with an insulating paper, the insulating layer constituting the earth-insulated power cable core can be expanded and reinforced in the same manner.

The epoxy connection sleeve 320 may include a connection conductor 321 and an epoxy molding part 326 , and the connection conductor 321 may be embedded inside the epoxy molding part 326 . As shown in FIG. 3 , one end of the connecting conductor 321 is exposed to the outside of the epoxy molding part 326 and the thickness of the connecting device is gradually increased in the direction of the housing fastening portion of the connecting device, that is, the other end. .

The reinforcing insulating layer 310 is configured to wrap at least a portion of the epoxy connection sleeve 320 in the direction of the other end of the connection conductor 321 with an insulating paper, and the epoxy molding part 326 of the epoxy connection sleeve 320 . As shown in FIG. 3 by reducing the thickness of the reinforcing insulating layer 310 in response to the increase in thickness, the outer peripheral surface of the boundary region between the epoxy molding part 326 and the reinforcing insulating layer 310 may be configured to be flat.

The other end of the connection conductor 321 of the epoxy connection sleeve 320 has an enlarged diameter, and the conductor 101x of the core 110y of the XLPE power cable can be connected therein.

As will be described later, the region embedded in the epoxy molding part 326 among the connection conductors 321 constituting the epoxy connection sleeve 320 may be made of an aluminum material having a small deviation in the coefficient of thermal expansion from the epoxy, and the connected cable The conductor of the core may be made of a copper material.

In addition, as a method of connecting the connecting conductor 321 and the conductor 101x of the core of the ground-insulated power cable, a crimping method is mainly used. The end of the connecting conductor 321 to which the conductor of the cable core is connected may be made of a copper material.

That is, in the embodiment shown in FIG. 3, one end of the connecting conductor 321 is composed of a copper conductor portion 321a having a connection hole so that the conductor 101x of the ground-insulated cable core 110x can be inserted and compressed. In addition, the aluminum conductor part 321b is joined to the rear of the copper conductor part 321a by welding or the like, and the region buried inside the epoxy may be all made of an aluminum material.

The other end of the connecting conductor 321 is connected to a conductor of the XLPE cable core 110y. When the conductor 101y of the XLPE cable core 110y is connected to the connector at the other end of the connecting conductor 321, the connecting conductor 321 is embedded in the epoxy molding part 326, so a connection method such as crimping may be used. The conductor adapter 330 having a separate fixing flange is connected to the conductor 101y of the XLPE cable core 110y by a method such as crimping, and then the conductor adapter 330 is connected to the connecting conductor 321. Connection can be completed by press-fitting into an insertion groove provided with a locking protrusion formed inside the connector at the other end.

A stress relief cone 350 for electric field relaxation may be mounted outside the exposed XLPE insulating layer 140y behind the conductor of the XLPE cable core 110y. An elastic support unit for elastically supporting the stress relief cone 350 to the rear of the stress relief cone 350 in order to adhere the stress relief cone 350 to the inside of the epoxy molding part 326 of the epoxy connection sleeve 320 . 360 may be provided.

The elastic support unit 360 is provided with a pipe-type propulsion member 361 for propelling the rear of the stress relief cone 350, and a plurality of spring-shaped elastic members 366 behind the propulsion member 361 are provided. It may be configured to be provided.

Therefore, when the elastic support unit 360 is mounted in a housing (h) constituting the heterogeneous power cable connection device, the elastic member 366 is compressed to elastically support the propulsion member 361. The propulsion member 361 of the unit 360 maintains a state in which the stress relief cone 350 is elastically propelled, so that the inner peripheral surface of the epoxy molding part 326 of the epoxy connection sleeve 320 and the inner peripheral surface of the stress relief cone 350 are maintained. adhesion can be maintained.

Figure 4 shows a cross-sectional view of the epoxy connection sleeve 320 constituting one embodiment of the heterogeneous power cable core connection device (300a, 300b, 300c) according to the present invention, Figure 5 is a heterogeneous power cable according to the present invention It shows a cross-sectional view of an epoxy connection sleeve 320 constituting another embodiment of the core connection device.

In general, the structure of the cable intermediate connection device may be configured for each layer to perform the same function as the structure of the cable. That is, since it is an intermediate connection device for a power cable, a structure corresponding to a conductor, an insulating layer, a semiconducting layer, and a cable jacket may be restored and configured for each layer.

In the case of each cable core, an original external semiconducting layer is provided, and in the case of a reinforcing insulating layer in the connection region of the ground insulation power cable core, an external semiconducting restoration layer can be formed by winding carbon paper, and the epoxy molding part 326. It is also connected to the outer peripheral surface of the device, and an electric field mitigating layer or a shielding layer must be provided.

The earth-insulated power cable core constitutes an external semiconducting restoration layer by winding carbon paper on the outside of the reinforcing insulating layer 310, and an external semiconducting layer provided outside the insulating layer made of XLPE of the core 110Y of the XLPE power cable ( 160 of FIG. 3) may be partially peeled off so as to be grounded with the internal electrode of the stress relief cone 350, the connection of the external semiconducting layer may be completed, but in the case of the epoxy connection sleeve 320 shown in FIG. In the connection area of the cable core, the outer peripheral surface of the epoxy molding part 326 is exposed to the insulating oil, so a semiconducting tape made of a resin material cannot be wound around the outer peripheral surface of the epoxy molding part 326 as an insulating layer, and the outer peripheral surface is composed of an inclined surface or has a shape Because it is complicated, a method of forming an external semiconducting restoration layer by winding carbon paper on the outside of the reinforcing insulating layer 310 of the earth insulating cable cannot be applied.

Therefore, the heterogeneous power cable connection device according to the present invention does not use tape or carbon paper, etc., and is not wrapped by the reinforcing insulating layer 310 among the epoxy molding parts 326 constituting the epoxy connection sleeve 320 . A method in which a coating-type metal shielding layer is provided was applied to the outer peripheral surface of the region, that is, the region where the external semiconductive restoration layer is not formed.

The metal shielding layer may be a silver powder coating film cs formed by coating silver powder on the outer peripheral surface of the epoxy molding part 326 . That is, it is possible to form a thin metal shielding layer by applying silver powder in powder form to the outer peripheral surface of the epoxy molding part 326 irrespective of its shape.

The silver powder coating film cs should be applied only to a portion of the outer peripheral surface of the epoxy molding part 326 other than the area where the reinforcing insulating layer 310 is formed in FIG. 2 . Since the outer peripheral surface of the reinforcing insulating layer 310 will be restored with an external semiconductive restoration layer using carbon paper, the range may be limited so that the external semiconductive restoration layer and the silver powder coating film cs are connected. This is because, if the silver powder coating film is provided up to the lower portion of the area covered by the reinforcing insulating layer 310 , the silver powder coating film is close to the connecting conductor 321 and there is a possibility of a short circuit.

And, since the silver powder coating film (cs) as the metal shielding layer can be easily swept away in the connection process, the silver powder coating film can be added with an epoxy coating film (ce).

Since the epoxy coating film (ce) is used to protect the silver powder coating film (cs), the thickness may not be large.

The epoxy connection sleeve 320 shown in FIG. 4 has a shape in which the outer diameter of the epoxy molding part 326 is gradually increased, but in the case of the epoxy connection sleeve 320 shown in FIG. 5, the diameter of the epoxy molding part 326 is It may have a step structure of this rapidly increasing shape. Such a step structure is a structure in which the housing or enclosure of the heterogeneous power cable core connection device and the epoxy connection sleeve 320 are fastened or assembled, and in this shape of the structure, forming the metal shielding layer by means of taping or carbon paper cross winding is more difficult.

Therefore, silver powder is applied to the outer peripheral surface of the epoxy molding part 326 that does not overlap with the reinforcing insulation layer 310 in the connection region of the ground insulation power cable core to form a silver powder coating film (cs), and then the epoxy coating film (ce) is applied. In addition, it is possible to prevent the loss of the silver powder coating film (cs) is the same as in the above-described embodiment.

Although the present specification has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims described below. will be able to carry out Therefore, if the modified implementation basically includes the elements of the claims of the present invention, all of them should be considered to be included in the technical scope of the present invention.

100: power cable
110: power cable core
300: heterogeneous power cable core connection device
1000: heterogeneous power cable connection system

Claims (5)

In the heterogeneous power cable core connecting device for connecting the earth insulated power cable core and the XLPE power cable core,
an epoxy connection sleeve having one end connected to the conductor of the earth insulated power cable core, a connecting conductor connected to the conductor and the other end of the XLPE power cable core, and an epoxy molding surrounding the connecting conductor;
A part of the insulating layer constituting the earth-insulated power cable core, the outside of the conductor connection part to which the conductor of the earth-insulated power cable core and one end of the connection conductor are connected, and at least a part of the epoxy molding sleeve are wrapped with insulating paper. floor;
a stress relief cone mounted between the rear inner side of the epoxy connection sleeve and the outer peripheral surface of the XLPE power cable core;
Including; and an elastic support unit mounted on the rear of the stress relief cone to elastically support the stress relief cone in the direction of the epoxy connection sleeve.
A heterogeneous power cable core connection device, characterized in that a metal shielding layer is provided on an outer circumferential surface of an area not covered by the reinforcing insulating layer among the epoxy molding parts constituting the epoxy connection sleeve. The method of claim 1,
The metal shielding layer is a heterogeneous power cable core connecting device, characterized in that the silver powder coating film formed by coating silver powder on the outer peripheral surface of the epoxy molding part. 3. The method of claim 2,
A heterogeneous power cable core connecting device, characterized in that an epoxy coating film formed by coating an epoxy on the outer surface of the silver powder coating film is added. The method of claim 1,
The connection conductor constituting the epoxy connection sleeve comprises a copper conductor part connected to the conductor of the ground-insulated power cable core, and an aluminum conductor part joined to the copper conductor part and buried inside the epoxy molding part. A heterogeneous power cable core connection device with a main pipe in which a plurality of earth-insulated power cable cores are accommodated, and the insulating oil is filled with high pressure;
a plurality of branch pipes branched from the main pipe into a plurality of branch pipes each accommodating a ground-insulated power cable core; and,
Any one of claims 1 to 4, wherein one end is connected to the plurality of branch pipes, and each of the plurality of earth insulated power cable cores is respectively connected to a plurality of XLPE power cable cores branched from the XLPE power cable at the other end A heterogeneous cable connection system comprising; a plurality of heterogeneous power cable core connection devices according to the present invention.

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