JP5123921B2 - Connection between insulation bushing and power cable and cable connection using this - Google Patents

Description

  The present invention relates to a connection portion between an insulating bushing and a power cable, and more particularly, an insulation bushing and a power cable useful when the insulating bushing is arranged vertically and the power cable is raised vertically toward the insulating bushing. Concerning the connection.

  Conventionally, in an inter-panel bus for a solid insulation switchgear of 36 kV class, an internal conductor of an insulation bushing and a cable conductor of a cable end are connected via a connecting conductor (for example, Non-Patent Document 1). ).

  FIG. 3 shows a partial cross-sectional view of the conductor connecting portion of the inter-board bus.

  In the figure, an insulating bushing 100 includes an epoxy insulator 200 and an inner conductor 300 embedded in the center of the epoxy insulator 200, and an end portion of the inner conductor 300 extends axially from an end portion of the epoxy insulator 200. It protrudes outward.

  The end portion of the CV cable 400 is stepped to expose the cable outer semiconductive layer 410, the cable insulating layer 420, and the cable conductor 430, and a conductor connection terminal 440 is provided at the exposed end portion of the cable conductor 430. It is attached by compression.

  The cable conductor 430 of the cable terminal 500 thus stripped and the inner conductor 300 of the insulating bushing 100 are electrically connected by a connecting conductor 600 having a split structure shown in FIG.

  In the figure, the connecting conductor 600 includes a pair of semi-cylindrical portions 610a and 610b combined in a cylindrical shape and a pair of semi-cylindrical portions 610a in a state where the pair of semi-cylindrical portions 610a and 610b are combined in a cylindrical shape. , And a bolt 620 for fastening 610b.

  In the figure, reference numeral 220 denotes an embedded metal fitting embedded in the flange portion 210 of the insulating bushing 100, 630 denotes a screw hole, 640 denotes a bolt insertion hole, and 650 denotes a counterbore.

  However, since the insulation bushing 100 and the cable terminal 500 are attached in the horizontal direction in the connection between the buses between the boards, the fixing operation of the connecting conductor 600 is not so difficult. As described above, when the insulating bushing 100 is arranged vertically and the CV cable 400 is also set up vertically, there is a problem in that workability is deteriorated because the attachment work is performed in the vertical direction. Specifically, in the installation work in the vertical direction, since one worker needs to support the cable terminal 500 and the other worker needs to perform the work of tightening the bolt 620 of the connecting conductor 600, at least. There is a drawback that two workers are required. In addition, when installing the cable connection part horizontally, it is necessary to attach the connecting conductor so that the core connection between the conductor connection terminal on the cable side and the inner conductor of the insulation bushing does not occur. Was desired.

2006 IEEJ National Convention 7-122

  The present invention has been made in order to solve the above-mentioned problems, and even when arranged vertically, the inner conductor of the insulating bushing and the cable conductor of the cable terminal that is raised vertically can be operated by one person. An object of the present invention is to provide a connection portion between an insulating bushing and a power cable that can be easily connected by a person.

  The connecting portion between the insulating bushing and the power cable according to the first aspect of the present invention is embedded in the center of the insulator and the insulator, and its own end is directed axially outward from the end of the insulator. An insulating bushing having a projecting inner conductor, a cable end where the end of the cable is stripped and the cable conductor is exposed, and a connecting conductor that connects the end of the inner conductor and the cable conductor; The connecting conductor is formed by integrating a pair of semi-cylindrical portions combined in a cylindrical shape, a holding member that holds the pair of semi-cylindrical portions combined in a cylindrical shape in a radially expandable manner, and a pair of semi-cylindrical portions. And a fastening member to be fastened.

  According to a second aspect of the present invention, in the insulating bushing and power cable according to the first aspect, a holding member is disposed in an annular groove formed on the outer periphery of the connecting conductor.

  According to a third aspect of the present invention, in the insulating bushing and the power cable according to the first aspect or the second aspect, the holding member is constituted by a wire spring, and the wire spring is a pair of semi-cylindrical shapes combined in a cylindrical shape. It is provided in the outer periphery of a part.

According to a fourth aspect of the present invention, in the insulating bushing and the power cable according to the first to third aspects, the fastening member is constituted by a bolt, and the bolt is a seat provided on one side of the semi-cylindrical portion. it is inserted into the boring and bolt insertion holes, in which the distal end portion of itself is screwed on the other side provided et been Taneji hole semicylindrical portion.

  According to a fifth aspect of the present invention, in the insulating bushing and power cable according to any one of the first to fourth aspects, the insulating bushing is disposed vertically, and the upper half of the connecting conductor is preliminarily formed as an internal conductor. The cable end is vertically raised toward the insulating bushing, and the cable end is plug-in connected to the lower half of the connecting conductor.

  A cable connecting portion according to a sixth aspect of the present invention includes an insulating bushing and a power cable connecting portion according to any one of the first to fifth aspects, a rubber block insulating cylinder, and a rubber The block insulating cylinder is provided on the outer periphery of the conductor connecting portion constituting the connecting portion between the insulating bushing and the power cable.

  According to the connecting portion between the insulating bushing and the power cable of the first to sixth aspects of the present invention and the cable connecting portion using the same, a pair of semi-cylindrical portions in which the connecting conductors are combined in a cylindrical shape, A wire spring as a holding member that holds a pair of semi-cylindrical parts combined in a cylindrical shape so as to be expandable and contractable in a radial direction, and a bolt as a fastening member that fastens the pair of semi-cylindrical parts together. Thus, the connecting conductor can be fixed to the end of the inner conductor. In this state, since the conductor connection terminal of the cable terminal can be plug-in connected toward the insulating bushing, the workability is improved as compared with the conventional case and the connection can be easily made.

The partial cross section figure which shows an example of the connection part of the insulation bushing and electric power cable of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the connection conductor in this invention, A part (a) is a front view of a connection conductor, A part (b) is the sectional view on the AO line of part (a). The partial cross section figure which shows an example of the connection part of the conventional insulation bushing and a power cable. It is explanatory drawing of the conventional connection conductor, A part (a) is a front view of a connection conductor, A part (b) is the sectional view on the AO line of part (a).

  Hereinafter, a preferred embodiment to which a connecting portion between an insulating bushing and a power cable according to the present invention is applied will be described with reference to the drawings.

  FIG. 1 is an explanatory view schematically showing a connection state between a vertically disposed insulating bushing and a vertically raised cable terminal.

  In the figure, an insulating bushing 1 includes an inner conductor 11 made of a rod such as copper or a copper alloy disposed in the center, and a hard and insulating insulator 12 provided on the outer periphery of the inner conductor 11. ing. Here, the insulator 12 is made of epoxy insulating resin or the like, and is integrally formed with the internal conductor 11 by molding.

  The insulating bushing 1 having such a configuration is arranged vertically, and the lower end portion of the internal conductor 11 is projected from the lower end portion of the insulator 12 outward in the axial direction.

  On the other hand, the end portion of the cable 2 is stepped to expose the cable outer semiconductive layer 21, the cable insulating layer 22, and the cable conductor 23, and the conductor connection terminal 24 is provided at the exposed end portion of the cable conductor 23. It is attached by compression. Here, the outer diameter of the conductor connection terminal 24 is substantially the same as the outer diameter of the inner conductor 11.

  FIG. 2 shows a connecting conductor 3 that connects the end of the inner conductor and the cable conductor.

  In the figure, the connecting conductor 3 holds a pair of semi-cylindrical portions 31a and 31b combined in a cylindrical shape and a pair of semi-cylindrical portions 31a and 31b combined in a cylindrical shape so as to be expandable and contractable in the radial direction. A wire spring 32 as a holding member and a bolt 33 as a fastening member for fastening the pair of semi-cylindrical portions 31a and 31b integrally are provided.

  The pair of semi-cylindrical portions 31a and 31b are provided in a semicircular shape so as to project inward at a portion that abuts against the outer half of the inner conductor 11 of the insulating bushing 1 and the conductor connection terminal 24 of the cable terminal 5. Abutting surfaces 32a and 32b, and half circumferential grooves 33a and 33b are provided on the outer periphery of the central portion in the axial direction along the circumferential direction.

  Of the pair of semi-cylindrical parts 31a and 31b, at least two screw holes 34a (35a) are provided at two positions at intervals of 180 degrees in the direction perpendicular to the dividing surface in the divided part of one semi-cylindrical part 31a. (A total of four screw holes in FIG. 2) are provided. In addition, bolt insertion holes 34b and 35b are provided at positions corresponding to the screw holes 34a and 35a of the split portion of the other semi-cylindrical portion 31b in a direction orthogonal to the split surface, and the other semi-cylindrical portion 31b. Countersunk holes 36, 36 are provided at positions corresponding to the bolt insertion holes 34b, 35b on the outer periphery of the outer periphery of the outer periphery of the bolt insertion holes 34b, 35b so as to communicate with the bolt insertion holes 34b, 35b. Yes. Here, the depth of the semicircular grooves 33a and 33b is set larger than the outer diameter of the wire spring 32 as a holding member.

  The pair of semi-cylindrical portions 31a and 31b having such a configuration are combined in a cylindrical shape, whereby an annular annular groove 37 is formed on the outer periphery of the central portion in the axial direction, and a wire spring 32 as a holding member is formed in the annular groove 37. By fitting, the pair of semi-cylindrical portions 31a and 31b expand and contract in the radial direction while being held in a cylindrical shape.

  Thus, the upper half of the connecting conductor 3 combined in a cylindrical shape is first attached to the lower end of the inner conductor 11 of the insulating bushing 1 arranged vertically, and the end of the inner conductor 11 is connected. Fixed to. Then, the cable terminal 5 is raised vertically toward the insulating bushing 1, and the conductor connection terminal 24 is inserted into the lower half of the connecting conductor 3 and pushed in. As a result, the cable terminal 5 is fixed to the lower half of the connecting conductor 3. That is, the cable terminal 5 is plug-in connected to the lower half of the connecting conductor 3.

  In this state, a bolt 33 made of a hexagon socket head bolt or the like as a fastening member is inserted into the counterbore 36 and the bolt insertion holes 34b and 35b, and the tip ends thereof are screwed into the screw holes 34a and 35a. By tightening with the bolt 33, the pair of semi-cylindrical portions 31a and 31b are integrated, and the contact surfaces 32a and 32b are brought into contact with the inner conductor 11 of the insulating bushing 1 and the cable conductor 23 of the cable terminal 5 to be electrically connected. Therefore, it is possible to cope with a large current such as 1250 A by surface contact with the contact surface. In addition, by firmly tightening the bolt 33 as a fastening member composed of a hexagon socket head cap screw or the like, the cable conductor 23 can be disconnected from the connecting conductor 3 even when a large pulling force is applied from the cable 2 side after assembly. Disappear.

  In the figure, reference numeral 12b denotes an embedded metal fitting embedded in the flange portion 12a of the insulator 12.

  Next, a well-known rubber block insulating cylinder (not shown) described in Non-Patent Document 1 is arranged on the outer periphery of the insulating bushing 1 and the connecting conductor 3 having such a configuration, and the embedded metal fitting 12b is attached by a metal bolt. The cable connection portion can be formed by fixing and waterproofing the cable. The rubber block insulating cylinder is, for example, a cylindrical insulating cylinder main body made of insulating rubber, and is provided integrally with the insulating cylinder main body on the inner periphery of the central portion of the insulating cylinder main body, and its inner peripheral surface is exposed. An internal shielding layer made of semiconductive rubber or the like, and an external shielding layer made of semiconductive rubber (or semiconductive paint) or the like provided integrally with the insulating tube main body on the outer periphery of the insulating tube main body. Yes.

  As described above, according to the connecting portion between the insulating bushing and the power cable using the connecting conductor 3 of the present invention and the cable connecting portion using the same, the pair of connecting conductors 3 are combined in a cylindrical shape. A wire spring 32 as a holding member for holding the portions 31a and 31b, a pair of semi-cylindrical portions 31a and 31b combined in a cylindrical shape in a radially expandable manner, and a pair of semi-cylindrical portions 31a and 31b. Since the bolts 33 as fastening members that are integrally fastened are provided, even when the insulating bushing 1 is arranged vertically, the connecting conductor 3 is attached to the lower end portion of the inner conductor 11 of the insulating bushing 1, and the connecting conductor 3 Can be fixed in advance before connecting the cable terminal 5 to the end of the inner conductor 11. Further, in this state, the conductor connector 24 of the cable terminal 5 raised vertically toward the insulating bushing 1 can be plugged in, so that even if there is only one worker, it can be easily connected. it can. Further, when the insulating bushing 1 is disposed horizontally, workability such as centering of the inner conductor 11 of the bushing 1 and the cable terminal 5 is improved as compared with the conventional case, and the connection work can be easily performed.

  In the above-described embodiments, the present invention is described with specific embodiments shown in the drawings. However, the present invention is not limited to these embodiments, and as long as the effects of the present invention are exhibited, You may comprise as follows.

  First, in the above-described embodiment, the connection between the insulating bushing 1 arranged vertically and the cable terminal 5 raised vertically is described. However, the insulating bushing 1 and the cable terminal 5 are arranged horizontally. The connection may be made in a state, and the direction of the insulating bushing is not particularly limited.

  Secondly, in the above-described embodiment, the lower end portion of the inner conductor 11 is described as having the same diameter over the entire length, but the ring-shaped protrusion for locking the connecting conductor 3 to the lower end portion of the inner conductor 11. A part may be formed. That is, the contact surface may be on the inner conductor side of the bushing instead of the connecting conductor side.

  Third, although the wire spring is used as the holding member in the above-described embodiment, a coil-shaped spring may be used instead of the wire spring.

  4thly, the connection part of the insulation bushing and electric power cable of this invention, and a cable connection part using the same are an air termination | terminus connection part, a gas termination | terminus connection part, an oil termination | terminus connection part, an intermediate | middle connection part, between boards Any type of insulation such as a bus bar using a rubber block insulating cylinder may be applied.

  Fifth, the inner conductor is not limited to one formed of copper or a copper alloy, and may be formed of aluminum or an aluminum alloy.

  Sixth, in the above-described embodiment, the rated voltage is 36 kV class, but the rated voltage may be lower or higher.

DESCRIPTION OF SYMBOLS 1 ... Insulation bushing 12 ... Insulator 11 ... Inner conductor 2 ... Cable 23 ... Cable conductor 3 ... Connection conductor 31a, 31b ... A pair of semi-cylindrical part 32 ...・ Holding member (wire spring)
33 ... Fastening member (bolt)
34a, 35a ... Screw hole 34b, 35b ... Bolt insertion hole 36 ... Counterbore 5 ... Cable end

Claims (6)

An insulating bushing having an insulator and an inner conductor embedded in the center of the insulator and having an end projecting outward from the end of the insulator in the axial direction;
A cable end where the end of the cable is stripped and the cable conductor is exposed;
A connecting conductor connecting the end of the inner conductor and the cable conductor;
The connecting conductor includes a pair of semi-cylindrical portions combined in a cylindrical shape, a holding member that holds the pair of semi-cylindrical portions combined in a cylindrical shape so as to be expandable and contractable in a radial direction, and the pair of semi-cylindrical shapes. A connecting portion between the insulating bushing and the power cable, comprising: a fastening member that fastens the portion integrally.   The connecting portion between the insulating bushing and the power cable according to claim 1, wherein the holding member is disposed in an annular groove formed on an outer periphery of the connecting conductor.   The insulating bushing and electric power according to claim 1, wherein the holding member is constituted by a wire spring, and the wire spring is provided on an outer periphery of the pair of semi-cylindrical portions combined in a cylindrical shape. Connection with cable. The fastening member is constituted by a bolt, and the bolt is inserted into a counterbore and a bolt insertion hole provided on one side of the semi-cylindrical portion, and a tip portion of itself is located on the other side of the semi-cylindrical portion. connecting portions between the insulating bushing and the power cable of claim 1 to claim 3 any one of claims, characterized in that it is screwed to the provided et been Taneji hole.   The insulating bushing is arranged vertically, and the upper half of the connecting conductor is attached in advance to the end of the inner conductor and fixed to the end of the inner conductor, and the cable end is perpendicular to the insulating bushing. 5. The connecting portion between the insulating bushing and the power cable according to claim 1, wherein the cable terminal is connected to the lower half of the connecting conductor by plug-in connection.   A connecting portion between the insulating bushing and the power cable according to any one of claims 1 to 5, and a rubber block insulating tube, wherein the rubber block insulating tube constitutes a connecting portion between the insulating bushing and the power cable. A cable connection portion provided on an outer periphery of a conductor connection portion.

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