JP2002345131A - Bus-bar connection device for gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus-bar connection device for a gas-insulated switchgear which can change the length of an epoxy bushing, according to a distance between a bus-bar connector and an apparatus placed in a gas. SOLUTION: This bus-bar connection device for a gas-insulated switchgear has a rubber-insulated bus-bar 20, having a center conductor 20A whose one end is attached to a bus-bar connector 5 and whose other end has a screw 20B formed in its end surface; a circumferential surface insulation 20C comprising a rubber insulation covering the outer circumference of the center conductor 20A, and a conical rubber insulation 20D, which is formed continuously with the circumferential surface insulation 20C so as to open in a conical shape from the other end of the center conductor; and an epoxy bushing 21, having a bushing conductor 21A in which a screw 21B coupled with the screw 20B of the center conductor by screwing and an epoxy resin unit 21D covering the outer circumference of the bushing conductor 21A and formed into a conical shape 21C, corresponding to the conical rubber insulation 20D of the rubber- insulated bus-bar in the neighborhood of the screw of the bushing conductor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus connecting device for a gas insulated switchgear, and more particularly to a bus connecting device for a gas insulated switchgear and a device disposed in the air.

[0002]

2. Description of the Related Art FIG. 3 is an exploded view showing the structure of a conventional bus connection device for a gas insulated switchgear. In this figure,
Reference numeral 1 denotes a tank containing a gas insulated switchgear, and 2 denotes a bushing mounted on the outer wall surface of the tank and having a conductor 2A penetrating the outer wall of the tank and connected to an internal gas insulated switchgear. A female screw 2B for screwing a stud is formed at the outer end of the conductor 2A. A stud 3 is formed at one end (the lower end in FIG. 3) with a screw portion 3A to be screwed into the screw portion 2B of the conductor portion 2A, and at the other end with a screw portion 3B. Reference numeral 4 denotes a connection piece having a hole 4A for inserting into the stud. Reference numeral 5 denotes a cross-shaped busbar connector, and a hole 5B whose diameter is gradually increased from the upper side to the lower side corresponding to the outer diameter of the bushing 2 is formed in the lower column 5A. Also, the upper fixed part 5C
Is provided with a hole portion 5D whose diameter gradually increases upward, and a through-hole 5G having a uniform diameter is formed in the horizontal busbar coupling portions 5E and 5F.

The bus connector 5 is mounted on the bushing 2 by inserting the hole 5B of the support 5A into the bushing 2. When the lower end 5H of the support 5A comes into contact with the outer wall surface of the tank 1, the stud 3 Screw portion 3B extends into hole 5D, and upper end 2C of conductor portion 2A of bushing 2 has through hole 5G.
The dimension relation is such that it is located on the lower surface of. Also,
The connection piece 4 inserted into the stud 3 is supported on the upper end 2C of the conductor 2A of the bushing 2. Reference numeral 6 denotes a rubber insulated busbar for connecting to an opening / closing device (not shown) arranged in a row board, and is provided in a through hole 5G of a busbar joint portion 5E of the busbar connector 5;
In FIG. 3, the tip 6 of the center conductor 6A is inserted from the left side.
B is inserted and fixed to a position where it contacts the connection piece 4, that is, a position indicated by a vertical line 6B at the center of the bus connector 5 in FIG.

An epoxy bushing 7 is used to connect to a device (not shown) disposed in the air.
A, and an epoxy resin portion 7C covering the outer periphery thereof. One end (the left end in FIG. 3) is inserted into the through hole 5G of the busbar joint portion 5F of the busbar connector 5 from the right side in FIG. At the position where the tip 7B contacts the connection piece 4, that is, in the center of the busbar connector 5 in FIG.
It is inserted and fixed to the position shown by B. Reference numeral 8 denotes a connection piece, and a hole 8A in a hole 5D of the fixing portion 5C of the bus connector 5.
Is inserted through the stud 3 and the center conductor 6 of the rubber insulated busbar 6
A and the bushing conductor 7A of the epoxy bushing 7 are in contact with each other. Reference numerals 9 and 10 denote washers and nuts, which are attached and screwed to the threaded portions 3B of the studs 3 after the connection pieces 8 are inserted, and fix the busbar connector 5 to the bushing 2. Reference numeral 11 denotes an insulating plug having a screw hole 11A,
Screw hole 1 in the hole 5D after the bus connector 5 is fixed by
1A is screwed into the threaded portion 3B of the stud, and the hole 5D is closed. At this time, the upper end 11B of the insulating plug 11 is fixed to the fixing portion 5C.
And the upper end 5J. 12 is attached to the fixing part 5C after the insulating plug 11 is attached,
An insulating cap that covers

[0005]

The conventional bus connection device for a gas insulated switchgear is constructed as described above, and the epoxy bushing for connecting the gas insulated switchgear to a device arranged in the air is a cross-shaped. The problem is that the connection position of the epoxy bushing cannot be changed even when the distance between the epoxy bushing and the device placed in the air is increased because the mounting position of the epoxy bushing is fixed because it was directly connected to the bus connector of there were.

SUMMARY OF THE INVENTION The present invention has been made in order to address the above-described problems, and has a gas insulation in which the length of an epoxy bushing can be changed according to the distance between a bus connector and a device placed in the air. An object of the present invention is to provide a bus connection device for a switchgear.

[0007]

A bus connecting device for a gas insulated switchgear according to the present invention includes a bus connector mounted on an outer wall surface of a tank accommodating the gas insulated switchgear, and an epoxy provided on the bus connector. With a bushing,
In a bus connection device for a gas insulated switchgear configured to connect a gas insulated switchgear in a tank and a device disposed in the air via a bus connector and an epoxy bushing,
A central conductor having one end attached to the bus connector and having a threaded portion formed at the other end surface; a peripheral insulating portion covering an outer periphery of the central conductor with a rubber insulating member; and a central conductor provided continuously with the peripheral insulating portion. A bushing conductor having a rubber insulated bus bar having a conical rubber insulating portion that opens in a conical shape from the other end of the bushing, a bushing conductor having a threaded portion capable of being screw-coupled to a threaded portion of the center conductor, and an outer periphery of the bushing conductor And an epoxy resin portion formed in a conical shape corresponding to the conical rubber insulating portion of the rubber insulating bus around the threaded portion of the bushing conductor.

In the bus connecting apparatus for a gas insulated switchgear according to the present invention, the threaded portion of the center conductor of the rubber insulated bus and the threaded portion of the bushing conductor of the epoxy bushing are both female threads, and are screwed to both threaded portions. The connection is made via connection bolts that can be used.

In the bus connecting device for a gas insulated switchgear according to the present invention, the inner diameter of the conical rubber insulating portion of the rubber insulating bus is smaller than the outer diameter of the conical portion of the epoxy resin portion of the epoxy bushing. The bushing conductor of the epoxy bushing is screw-connected to the center conductor of the rubber insulating bus so as to spread the rubber insulating portion.

A bus connecting device for a gas insulated switchgear according to the present invention further comprises a center conductor having threaded portions formed at both end surfaces thereof, and covering the outer periphery of the center conductor and facing the tip at both ends of the center conductor. A coupling having a rubber insulating portion formed in a conical shape with a reduced diameter, a center conductor for a rubber insulating bus having threaded portions formed at both end surfaces, and an outer periphery of the center conductor for the rubber insulating bus is covered with a rubber insulating member. Peripheral insulation,
A rubber insulating bus for insertion having a conical rubber insulating portion that is provided continuously with the peripheral surface insulating portion and opens in a conical shape from both ends of the center conductor for the rubber insulating bus is provided, and the coupling and the rubber insulating bus for insertion are provided. Are screwed together, the coupling is connected to a bus connector via a rubber insulated bus, and the rubber insulated bus for insertion is connected to an epoxy bushing.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded view showing the configuration of the first embodiment. In this figure,
The same or corresponding parts as those in FIG. 3 are denoted by the same reference numerals and description thereof will be omitted. The difference from FIG. 3 is that a rubber insulated bus for extending the bushing length is provided between the bus connector and the epoxy bushing, and the tip structure of the epoxy bushing is configured to be easily coupled to the rubber insulated bus for extension. is there. That is, in FIG. 1, reference numeral 20 denotes a rubber insulated busbar provided to enable the length of the epoxy bushing to be extended.
One end (the left end in FIG. 1) is connected to the bus connector 5, and the center conductor 20 </ b> A has a threaded portion 20 </ b> B formed with a female screw on the other end surface, and a peripheral insulation covering the outer periphery of the center conductor 20 </ b> A with a rubber insulating member. A portion 20C and a conical rubber insulating portion 20D provided in continuation with the peripheral surface insulating portion 20C and opened in a conical shape from the other end of the central conductor 20A. One end of the center conductor 20A has a vertical line 7B at the center of the bus connector 5 as in the conventional device.
Inserted and fixed to the position indicated by.

Reference numeral 21 denotes an epoxy bushing connected to the bus connector 5 via the rubber insulated bus 20. The epoxy bushing 21 has a bushing conductor 21A having a threaded portion 21B formed of the same female thread as the threaded portion 20B of the rubber insulated bus 20. , While covering the outer periphery of the bushing conductor 21A,
The periphery of 1B is composed of an epoxy resin portion 21D formed in a conical shape corresponding to the conical rubber insulating portion 20D of the rubber insulating busbar 20, that is, a conical shape 21C that tapers toward the tip. Reference numeral 22 denotes a connection bolt, one end of which is screwed into the screw portion 20B of the rubber insulated busbar 20, and the other end of which is a screw portion 21B of the epoxy bushing 21.
And screwed together to join them together.

Since this embodiment is configured as described above, when it is necessary to extend the length of the epoxy bushing 21, the rubber insulating bus 20 and the epoxy bushing 21 are connected via the connection bolt 22. By combining the two, the length of the epoxy bushing can be substantially extended, so that even when the distance to the device placed in the air is long, it is possible to cope with the trouble. In addition, since the inner diameter of the conical rubber insulating portion 20D of the rubber insulating bus 20 is smaller than the outer diameter of the conical portion 21C of the epoxy bushing, when the rubber insulating bus 20 and the epoxy bushing 21 are connected, the epoxy bushing is not used. The cone-shaped portion 21C at the distal end of 21 is inserted into the cone-shaped rubber insulation portion 20D so as to spread out the cone-shaped rubber insulation portion 20D, and the elastic force of the cone-shaped rubber insulation portion 20D
Is in close contact with the conical portion 21C of the epoxy bushing, so that sufficient interfacial insulation can be ensured.

Embodiment 2 FIG. Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows Embodiment 2
1 is an exploded view showing the configuration of FIG. 1. In the case where the length of the rubber insulated bus bar 20 shown in FIG. It shows a countermeasure in a case where the length of the rubber insulated bus is restricted. In this figure,
The same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals and description thereof will be omitted. The difference from FIG. 1 is that the rubber insulated bus bar is divided into a plurality of pieces having a length that can be manufactured, and each is connected by a coupling.

That is, in FIG. 2, reference numeral 23 denotes a coupling, and threaded portions 23A, 23 constituting female threads on both end surfaces.
B, and a rubber insulating portion 23F that covers the outer periphery of the central conductor 23C and reduces the diameter at both ends of the central conductor toward the respective ends to form conical shapes 23D and 23E. Have been. Reference numeral 24 denotes a rubber insulated bus for insertion, and a center conductor 2 for a rubber insulated bus in which screw portions 24A and 24B constituting female threads are formed on both end surfaces.
4C, a peripheral insulating portion 24D for covering the outer periphery of the rubber-insulated bus center conductor 24C with a rubber insulating member, and a conical shape provided from the both ends of the rubber-insulated bus center conductor 24C provided continuously with the peripheral insulating portion. Conical rubber insulation part 2 that opens to
4E and 24F. Reference numeral 25 denotes a screw portion 23B of the coupling 23 and a rubber insulating busbar 24 for insertion.
Connection bolts which are screwed into the respective screw portions 24A to join them together. Also, the rubber insulated busbar 2 for insertion
It is needless to say that the epoxy bushing 7 is connected to the screw portion 24B of FIG. 4 via a connection bolt (not shown) in the same manner as in FIG.

Since this embodiment is constructed as described above, the rubber insulated busbar 20 is connected via the coupling 23.
By connecting the rubber insulated bus bar 24 to the rubber insulated bus bar 24 for insertion, a rubber insulated bus bar of a required length can be freely formed. Therefore, even when the length of the rubber insulated busbar that can be manufactured due to manufacturing facilities or the like is restricted, a rubber insulated busbar having a length exceeding the length can be formed, and the limitations of the manufacturing facilities and the like can be overcome. In addition, expandability at the time of rubber insulated bus connection can be improved.

[0017]

Since the bus connecting device for a gas insulated switchgear according to the present invention is constructed as described above, the substantial length of the epoxy bushing corresponds to the distance from the device placed in the air. Can be changed freely.

[Brief description of the drawings]

FIG. 1 is an exploded view showing a configuration of a first embodiment of the present invention.

FIG. 2 is an exploded view showing a configuration of a second embodiment of the present invention.

FIG. 3 is an exploded view showing a configuration of a conventional bus connection device for a gas insulated switchgear.

[Explanation of symbols]

1 tank, 2 bushings, 3 studs, 5 bus connector, 6,20 rubber insulated bus, 20A center conductor, 20B, 21B screw, 20C peripheral insulation, 2
0D Conical rubber insulating part, 21 epoxy bushing, 21A bushing conductor, 21C conical part, 2
1D epoxy resin part.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 5G016 DA24 DA28 5G017 BB21 FF12 5G365 CC09

Claims (4)

[Claims] 1. A bus connector mounted on an outer wall surface of a tank accommodating a gas insulated switchgear, and an epoxy bushing provided on the bus connector. A gas-insulated switchgear bus connecting device configured to connect a gas-insulated switchgear and a device disposed in the air, the center conductor having one end attached to the bus connector and having a threaded portion formed on the other end surface. A rubber insulating busbar having a peripheral insulating portion covering the outer periphery of the center conductor with a rubber insulating member, and a conical rubber insulating portion provided in connection with the peripheral insulating portion and opening in a conical shape from the other end of the center conductor. A bushing conductor formed with a threaded portion adapted to be screw-coupled to a threaded portion of the center conductor; and a bushing covering the outer periphery of the bushing conductor and the bushing. A bus connecting device for a gas insulated switchgear, comprising: an epoxy bushing having a conical shape of an epoxy resin portion corresponding to the conical rubber insulating portion of the rubber insulated bus around the threaded portion of the conductor. 2. The screw part of the center conductor of the rubber insulated busbar and the screw part of the bushing conductor of the epoxy bushing are both female threads, and are connected via connection bolts that can be screwed into the two screw parts. The bus connecting device for a gas insulated switchgear according to claim 1, wherein 3. The bushing of an epoxy bushing in which the inner diameter of the conical rubber insulating portion of the rubber insulating bus is made smaller than the outer diameter of the conical portion of the epoxy resin portion of the epoxy bushing, and the conical rubber insulating portion is spread out. 3. The bus connecting device for a gas insulated switchgear according to claim 1, wherein the conductor and the center conductor of the rubber insulated bus are screw-connected. 4. A central conductor having threaded portions formed at both end surfaces thereof, and a rubber insulating portion which covers the outer periphery of the central conductor and has a conical shape with a reduced diameter toward the tip at both ends of the central conductor. A center conductor for a rubber insulated bus having screw portions formed on both end surfaces thereof, a peripheral insulated portion covering an outer periphery of the center conductor for the rubber insulated bus with a rubber insulating member, and being connected to the peripheral insulated portion. A rubber insulated bus for insertion having a conical rubber insulating portion that opens in a conical shape from both ends of the center conductor for the rubber insulated bus,
The coupling and the rubber insulated bus for insertion are screwed together, the coupling is connected to a bus connector via a rubber insulated bus, and the rubber insulated bus for insertion is connected to an epoxy bushing. The bus connection device for a gas insulated switchgear according to claim 1 or 2, wherein