JP4313881B2 - Insulated busbar connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulated bus connecting structure used for inter-board communication such as a cubicle type gas insulated switchgear (GIS) or an air insulated switchgear.
[0002]
[Prior art]
FIG. 3 shows a schematic configuration of a cubicle type gas insulated switchgear 100 using a rectangular container. The apparatus 100 includes a plurality of cubicles 101, and the cubicles 101 contain devices for each unit circuit, such as circuit breakers, disconnectors, instrument transformers, and the like. Power is supplied to the device 100 via a power receiving cable 102, and the cubicles 101 are electrically connected to each other via a T-shaped branch connection portion, that is, a T-type bushing 50, with an insulating bus 51 for inter-board communication. ing. In this example, the gas insulated switchgear 100 is further connected to the transformer 104 by the Tr communication cable 103.
[0003]
FIG. 4 shows an example of a T-shaped bushing 50 used in such a gas insulated switchgear 100. A conventional T-shaped bushing 50 has a T-shaped bushing mold 53 made of epoxy resin, in which a T-shaped connection conductor 52 is integrally molded. That is, the T-shaped bushing mold 53 includes a horizontal portion 53A formed integrally with a sleeve-like connection conductor 52A and a vertical portion formed integrally with a conducting conductor 52B extending vertically downward from the connection conductor 52A. 53B. This T-shaped bushing mold 53 is fixed to a gas insulated switchgear main body (not shown) by a support metal fitting 54.
[0004]
When the T-type bushing 50 is located at the end of the row board, the horizontal connection portion 53A of the T-type bushing mold 53 is attached with a current-carrying connection portion 55 for the insulation bus bar 51 of the device on the right side of the drawing in this example. In addition, an insulating plug 56 is mounted on the other side (left side in the drawing).
[0005]
In this example, the current-carrying connection portion of the insulated bus bar 51, that is, the cable connection material (male side) 55 has a prefabricated structure well known to those skilled in the art, and is a connection terminal formed at the distal end portion of the bus bar (cable) 51. (Plug and multi-ram band) 57, a stress cone 58, a compression device 59, a cable protection fitting 60, and other connecting parts are connected to the sleeve-like conductor 52A of the bushing internal connection portion. The insulating plug 56 has an insulating rod 61 and an end opposite to the busbar connecting end of the bushing by an insulating plug component such as a stress cone 62 formed around the insulating rod 61, a compression device 63, and a lid 64. Seal electrically.
[0006]
When the insulated bus 51 is connected to the conventional T-shaped bushing 50, the working method shown in FIG. 5 is used. In this example, as shown in FIG. 5A, each cubicle 101 (101A, 101B) is provided with a T-shaped branch connection portion, that is, a T-shaped bushing 50 (50A, 50B). In this example, it is assumed that T-type bushings 50A and 50B are connected by an insulation bus 51 for inter-board connection, and the current-carrying connection portion of the insulation bus 51 is already connected to one side of the T-type bushing 50B. .
[0007]
Insulation buses 51 for connecting between boards have cable connection materials 55 formed at both ends thereof. In this example, on the left side of the buses 51, the connection material 55 such as a stress cone is moved to the center of the buses. Thus, the length L of the terminal conductor portion of the insulating bus bar protruding outward from the cable connecting material of the left side portion is made longer. A connection terminal 57 is attached to the tip of each terminal conductor. As for such an insulated bus 51, for example, an insulated bus which is a 77 KVCV cable is substantially rigid and cannot be bent.
[0008]
Therefore, first, as shown in FIG. 5B, the longer end conductor portion of the insulated bus 51 that is in a straight state is inserted into the T-shaped bushing 50A. Next, as shown in FIG. 5C, after inserting the insulating bus 51 deeper than the center of the T-shaped bushing 50A, the insulating bus 51 is pulled back toward the T-shaped bushing 50B, and the other end conductor portion Is set in the T-shaped bushing 50B. As shown in FIG. 5D, after setting the insulating bus bar 51 to a fixed position, first, the metal fitting 55 including the stress cone of the T-shaped bushing 50B is set at a predetermined position, and then the metal fitting of the T-shaped bushing 50A. Class 55 is set at a predetermined position. In some cases, as shown in FIG. 4, an insulating plug 56 is attached to the other side of the T-shaped bushing 50A.
[0009]
The connection work of the row boards using the T-type bushing 50 and the insulating bus bar 51 can be done from two directions by using the T-type bushing 50, and the distance between the boards can be shortened as compared with the past. In addition, the conductor connection is a plug-in system, which eliminates the need for special tools and simplifies the work.
[0010]
[Problems to be solved by the invention]
However, in order to connect the rows using the conventional T-shaped bushing 50 and the insulating bus 51, it is first necessary to form a connecting material 55 having a complicated structure on the insulating bus 51, and its manufacturing and assembly. Requires a lot of time and effort. There is also a problem in price. Furthermore, since the insulated bus bar 51 is substantially rigid and cannot be bent easily, it is necessary to increase the distance between the rows 101 to some extent. Therefore, there is a limit to downsizing the device 100. Further, as described above, a complicated connection work procedure is still required for connection, and further improvement in workability is desired.
[0011]
Also, in the event of an accident or when it is necessary to replace the installed insulation bus due to capacity change, it is necessary to remove the insulation bus from the end in order, making it difficult to respond quickly. It also has.
[0012]
Accordingly, an object of the present invention is to provide an insulating busbar connection structure that is extremely simple in structure, can be further reduced in size, can be connected and disconnected efficiently and quickly, and is inexpensive. Is to provide.
[0013]
[Means for Solving the Problems]
The above object is achieved by the insulated bus connecting structure according to the present invention. In summary, the present invention is an insulated bus connection structure having a connector installed in each cubicle and an insulated bus for connecting between the cubicles,
The connector includes a connection conductor, an insulator provided on an outer periphery of the connection conductor, a mounting hole into which a connection terminal portion of the insulating bus can be inserted, and a mounting hole into which a panel bushing protruding from each cubicle can be inserted. A connecting hole is formed at the end of the connecting conductor that communicates with the mounting hole along the same axis as the mounting hole, and an outer semiconductive layer is provided on the outer periphery of the insulator. Formed and the outer jacket reaches the inner surface of the mounting hole at the end of the mounting hole of the connector,
The insulated bus comprises a center conductor and an insulator jacket provided on the outer periphery of the center conductor, and both connecting terminal portions of the insulated bus are exposed at the center conductor, and on the exposed outer periphery of the center conductor. An annular groove is formed, a conductor connector composed of a multi-ram band is disposed in the annular groove, and when the insulated bus terminal portion is connected to the connector, the conductor of the insulated bus in the connection hole of the connecting conductor of the connector A connector is electrically connected, and an outer semiconductive layer region is formed on the outer periphery of the central portion of the insulated bus, and the outer semiconductive layer region is formed when the insulated bus terminal portion is connected to the connector. So as to electrically overlap the outer semiconductive layer of the connector ,
In the board bushing, an annular groove is formed on the terminal outer periphery of the terminal conductor of the board bushing, and a conductor connector made of a multi-ram band is disposed in the annular groove.
Insulated busbar connection structure characterized by the above.
[0014]
According to an embodiment of the present invention, the connector is a T-branch connector in which the connection conductor is T-shaped, and the mounting holes are provided at both ends in the horizontal direction so that the connection terminals of the insulated bus can be inserted from both sides. It is formed.
[0015]
According to another embodiment of the present invention, the connector is an L-shaped connector in which the connection conductor is L-shaped, and the attachment terminal portion of the insulated bus can be inserted into the horizontal end of the connector. A hole is formed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the insulated bus connecting structure according to the present invention will be described in more detail with reference to the drawings.
[0017]
1 and 2 show an embodiment of the insulated bus connecting structure 1 of the present invention. The insulated bus connection structure 1 of the present invention includes an insulated bus 2 and a connector for connecting the insulated bus 2. The connector has a structure of a T-branch connector 10 or an L-shaped connector 20 and is attached to each cubicle 100.
[0018]
First, the insulating bus 2 will be described. The insulating bus 2 includes a central conductor 3 that is a copper rod and the like, and an internal semiconductive layer 4 that is formed of a semiconductive EP rubber or the like provided on the outer periphery of the central conductor 3. And an outer cover 5 formed of an insulator such as EP rubber provided on the outer periphery of the inner semiconductive layer 4. The inner semiconductive layer 4 and the insulator jacket 5 are not provided at both ends of the insulating bus 2, and the central conductor 3 is exposed. An annular groove is formed in the outer periphery of the exposed end of the center conductor 3, and a conductor connector (multilam band) 6 configured to be radially contractible is disposed therein. In addition, an outer semiconductive layer 7 is formed on the outer periphery of the central portion of the insulating bus 2 over a predetermined length.
[0019]
In the present embodiment, the inner semiconductive layer 4 is described as being disposed on the outer periphery of the center conductor 3, but when an epoxy resin is used as the outer cover 5, the inner semiconductive layer 4 can be omitted.
[0020]
The T-branch connector 10 is made of an insulating material such as EP rubber, in which a T-shaped metal connection conductor 12 having a semiconductive EP rubber layer (internal semiconductive layer) 11 formed on the outer periphery is integrally molded inside. T-shaped insulator 13 is provided. That is, the T-shaped insulator 13 has a horizontal portion 14 and a vertical portion 15, and is formed in the horizontal direction so that the connecting end portions of the inter-board connection insulating bus 2 can be inserted at both ends of the horizontal portion 14. A mounting hole 14A is provided. The vertical portion 15 has a mounting hole 15A in which the board bushing 110 protruding upward from the cubicle 101 is fitted. An outer cover 16 made of an external semiconductive layer made of semiconductive EP rubber or the like is formed on the outer periphery of the T-shaped insulator 13. In particular, a region corresponding to both end portions of the T-shaped insulator horizontal portion 14 and a lower end portion of the vertical portion 15 of the outer semiconductive layer jacket 16 forms an electric field relaxation layer (stress cone) 17.
[0021]
A connecting hole 12A is formed at both ends of the connecting conductor 12 located in the horizontal portion 14 of the T-branch connector 10 so as to communicate with the mounting hole 14A along the same axis as the mounting hole 14A. A recess 11A having a diameter equivalent to or slightly larger than the connection hole 12A is formed. Further, a connection hole 12B is formed in the central portion of the connection conductor 12 so as to communicate with the vertical hole 15A, and the inner semiconductive layer 11 has a recess 11B having a diameter equal to or somewhat larger than the connection hole 12B. It is formed.
[0022]
In the T-branch connector 10, the end surface portion of the vertical portion 15 is fixed to the cubicle 101 with a support fitting (not shown) or the like via an insulating spacer 120. At this time, the board bushing 110 protruding from the cubicle 101 is fitted in the mounting hole 15A of the T-shaped insulator 13. The end surface 111 of the board bushing 110 is in contact with the recess 11B of the internal semiconductive layer 11, and the terminal conductor 112 of the board bushing 110 is electrically connected to the connection hole 12B of the connection conductor 12 via a conductor connector 113 such as a multilam band. Connected.
[0023]
The L-shaped connector 20 is made of an insulating material such as EP rubber, in which an L-shaped connection conductor 22 having a semiconductive EP rubber layer (inner semiconductive layer) 21 formed on the outer periphery is integrally molded therein. It has a shape insulator 23. That is, the L-shaped insulator 23 has a horizontal portion 24 and a vertical portion 25, and is formed in a horizontal direction in which one end of the horizontal portion 24 can be inserted into the connecting end of the inter-board connection insulating bus 2. It has a mounting hole 24A. The vertical portion 25 has a mounting hole 25A in which a board bushing 110 protruding from the cubicle 101 similar to that described above is fitted. An outer cover 26 made of an external semiconductive layer made of semiconductive EP rubber or the like is formed on the outer peripheral portion of the L-shaped insulator 23. In particular, a region corresponding to the end portion of the L-shaped insulator horizontal portion 24 and the lower end portion of the vertical portion 25 of the outer semiconductive layer jacket 26 forms an electric field relaxation layer (stress cone) 27.
[0024]
A connection hole 22A is formed at the end of the connection conductor 22 located in the horizontal portion 24 of the L-shaped connector 20 in communication with the mounting hole 24A along the same axis as the mounting hole 24A. A recess 21A having a diameter equivalent to or somewhat larger than the connection hole 22A is formed. Further, the connection conductor 22 is formed with a connection hole 22B in communication with the vertical hole 25A, and the inner semiconductive layer 21 is formed with a recess 21B having a diameter equal to or slightly larger than the connection hole 22B. .
[0025]
In this L-shaped connector 20, the end surface portion of the vertical portion 25 is fixed to the cubicle 101 with a support fitting (not shown) or the like via an insulating spacer 120. At this time, the board bushing 110 protruding from the cubicle 101 similar to the above is fitted in the mounting hole 25A of the L-shaped insulator 23. The end surface 111 of the board bushing 110 is in contact with the recess 21B of the internal semiconductive layer 21, and the terminal conductor 112 of the board bushing 110 is electrically connected to the connection hole 22B of the connection conductor 12 via a conductor connector 113 such as a multilam band. Connected.
[0026]
Next, an aspect in which the cubicles 101 are connected using the insulated bus connection structure of the present invention will be described. In this embodiment, it is assumed that the connectors 10 and 20 are installed in the cubicle 101 in a manner in which the L-shaped connectors 20 are arranged on both sides of the T-branch connector 10.
[0027]
As shown in FIG. 1, the end portions of the respective insulation buses 2 are inserted into the mounting holes 14 </ b> A of the horizontal portion 14 of the T-branch connector 10 from both sides. The insulating bus 2 has the end surface 8 of the inner semiconductive layer 4 and the insulating layer jacket 5 in contact with the connecting conductor 12 and the end surface recess 11A of the inner semiconductive layer, respectively. It is electrically connected to the connection hole 12A of the connection conductor 12 through a conductor connector 6 such as a ram band.
[0028]
Next, the other end portion of each insulating bus 2 is inserted into the mounting hole 24 </ b> A of the corresponding L-shaped connector 20. The insulating bus 2 has the end surface 8 of the inner semiconductive layer 4 and the insulating layer jacket 5 in contact with the connection conductor 22 and the end surface recess 21A of the inner semiconductive layer, respectively, and at the same time the terminal conductor 9 of the insulating bus 2 It is electrically connected to the connection hole 22A of the connection conductor 22 through a conductor connector 6 such as a ram band.
[0029]
As a result of the above connection work, the insulated bus bar connection structure 1 as shown in FIG. 2 is assembled. The T-branch connector 10 and the L-shaped connector 20 are installed in the switchgear body so that the vertical mounting holes 15A and 25A are fitted with the panel bushings 110 protruding from the cubicles 101 of the switchgear 100. The end surface 111 of the board bushing 101 is in contact with the recesses 11B and 21B of the inner semiconductive layers 11 and 21 in the vertical part of the connectors 10 and 20, and the terminal conductor 112 of the board bushing 110 is a conductor connector such as a multilam band. The connection conductors 12 and 22 are electrically connected to the connection holes 12B and 22B via the 113. Then, each connector 10 and 20 is fixed to the switchgear main body 100 with a support metal fitting (not shown).
[0030]
In this state, both end portions of the semiconductive layer 7 formed on the outer peripheral portion of the central portion of each insulating bus 2 are located in the external semiconductive layer electric field relaxation layers 17 and 27 of the connectors 10 and 20, thereby The external semiconductive layers 7 and 16 and 7 and 26 of the busbar connection structure are electrically connected to achieve electric field relaxation of the insulated busbar connection structure.
[0031]
According to the insulated bus connecting structure of the present invention, the connecting material of the prefabricated structure is not required for the insulated bus as in the prior art, the structure is very simple, and the cost is low. Insulated busbars can be assembled by simply inserting their ends into the mounting and connecting holes of the T-branch and L-shaped connectors 10 and 20, and the workability of the insulated busbar is extremely good. The distance can be further shortened.
[0032]
In the above description, the terminal of the insulated bus 2 is attached with the T-branch and L-shaped connectors 10 and 20 not fixed to each cubicle 101. It is also possible to perform the connection work in a state where 20 is fixed to the cubicle 101.
[0033]
It is preferable that a U-shaped metal case (not shown) is mounted on the outer periphery of the insulating bus bar connection structure having the above-described structure for protecting the device.
[0034]
【The invention's effect】
As described above, the insulated bus connection structure of the present invention is an insulated bus connection structure having a connector installed in each cubicle and an insulated bus for connecting between the cubicles. A conductor, an insulator provided on the outer periphery of the connection conductor, a mounting hole into which a connection terminal portion of the insulating bus can be inserted, and a mounting hole into which a board bushing protruding from each cubicle can be inserted. A connecting hole is formed at the end communicating with the mounting hole along the same axis as the mounting hole, and a jacket made of an external semiconductive layer is formed on the outer periphery of the insulator, and the jacket is formed of the connector. The inner end of the mounting hole reaches the inner surface of the mounting hole, and the insulated bus has a center conductor and an insulator jacket provided on the outer periphery of the center conductor, and the center conductor is exposed at both connection end portions of the insulated bus. to, the exposed center conductor An annular groove formed in the end periphery, conductor connectors made of multi-ram band is disposed in the annular groove, a conductor connector of insulated bus connection hole of the connector of the connection conductor when the insulated bus terminal portion is connected to the connector Are electrically connected, and an outer semiconductive layer region is formed on the outer peripheral portion of the central portion of the insulated bus, and when the insulated bus terminal portion is connected to the connector, the outer semiconductive layer region becomes the outer semiconductive layer of the connector. The board bushing is configured so that an annular groove is formed on the terminal outer periphery of the terminal conductor of the board bushing, and a conductor connector made of a multi-ram band is disposed in the annular groove . The structure is extremely simple, can be reduced in size, can be connected and disconnected efficiently and quickly, and is inexpensive in price.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of an insulated bus connecting structure according to the present invention.
FIG. 2 is a cross-sectional view showing one usage mode of the insulated bus bar connection structure of the present invention.
FIG. 3 is a schematic configuration diagram of a cubicle type gas insulated switchgear (GIS) that can use the insulated bus bar connection structure of the present invention.
FIG. 4 is a cross-sectional view of a conventional T-shaped bushing.
FIG. 5 is a diagram illustrating a procedure for connecting an insulated bus using a conventional T-shaped bushing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulated bus connection structure 2 Insulated bus 3 Center conductor 4 Inner semiconductive layer 5 Insulator sheath 6 Conductor connector 7 Semiconductive layer 10 T branch connector 11 Internal semiconductive layer 12 Connection conductors 12A and 12B Connection hole 13 T-shaped insulator 14A, 15A Mounting hole 16 External semiconductive layer jacket 17 Bell mouth part 20 L-shaped connector 21 Internal semiconductive layer 22 Connection conductor 22A, 22B Connection hole 23 L-shaped insulators 24A, 25A Mounting hole 26 External semiconductive layer jacket 27 Bellmouth

Claims (3)

An insulated bus connection structure having a connector installed in each cubicle and an insulated bus for connecting between the cubicles,
The connector includes a connection conductor, an insulator provided on an outer periphery of the connection conductor, a mounting hole into which a connection terminal portion of the insulating bus can be inserted, and a mounting hole into which a panel bushing protruding from each cubicle can be inserted. A connecting hole is formed at the end of the connecting conductor that communicates with the mounting hole along the same axis as the mounting hole, and an outer semiconductive layer is provided on the outer periphery of the insulator. Formed and the outer jacket reaches the inner surface of the mounting hole at the end of the mounting hole of the connector,
The insulated bus comprises a center conductor and an insulator jacket provided on the outer periphery of the center conductor, and both connecting terminal portions of the insulated bus are exposed at the center conductor, and on the exposed outer periphery of the center conductor. An annular groove is formed, a conductor connector composed of a multi-ram band is disposed in the annular groove, and when the insulated bus terminal portion is connected to the connector, the conductor of the insulated bus in the connection hole of the connecting conductor of the connector A connector is electrically connected, and an outer semiconductive layer region is formed on the outer periphery of the central portion of the insulated bus, and the outer semiconductive layer region is formed when the insulated bus terminal portion is connected to the connector. So as to electrically overlap the outer semiconductive layer of the connector ,
In the board bushing, an annular groove is formed on the outer periphery of the terminal conductor of the board bushing, and a conductor connector made of a multi-ram band is disposed in the annular groove.
Insulated bus bar connection structure.   2. The insulated bus according to claim 1, wherein the connector is a T-branch connector in which the connection conductor is T-shaped, and the mounting holes are formed at both ends in the horizontal direction so that connection terminals of the insulated bus can be inserted from both sides. Connection structure.   2. The insulated bus connection according to claim 1, wherein the connector is an L-shaped connector in which the connection conductor is L-shaped, and the mounting hole is formed at one horizontal end so that a connection terminal portion of the insulated bus can be inserted. Construction.

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