JPH08149628A - T-junction connecting structure - Google Patents

Abstract

PURPOSE: To make inter-board connecting bus wiring work easier so as to reduce the burden on a worker by respectively supporting terminal hole parts of T-junction bushings which accept the connecting sections of an inter-board connecting bus on the external surfaces of apparatuses in slidable states. CONSTITUTION: T-junction bushings 3 and 4 are respectively fixed to apparatuses, such as cubicles 1 and 2, etc. At the time of fitting an inter-board connecting bus 5 to the bushings 3 and 4, the bushing 3 is raised so that the bushing 3 can be positioned to the farthest position from the external surface of the cubicle 1. When the bushing 3 is positioned in such a way, a worker can carefully insert the compression plug 7A of the bus 5 into the T-junction fitting 3A of the bushing 3 without tilting the bus 5 by peeping into the terminal hole of the bushing 3. Then the bushing 3 is brought down and the electrical connection between the bus 5 and the bushings 3 and 4 is completed. Therefore, the burden on the worker can be reduced, because the bus 5 can be easily fitted to the bushings 3 and 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gas insulated switch (GI
The present invention relates to a T-branch connection structure for electrically connecting high-voltage electric devices such as cubicles of S).

[0002]

2. Description of the Related Art A cubicle type gas-insulated switch (C-GIS) has a structure in which a cubicle accommodates a device such as a circuit breaker for each unit circuit, and an insulating gas (SF ₆ ) is sealed at a low pressure. . The cubicles are electrically connected by a T-branch connecting structure composed of a T-branch bushing and a board-to-board connecting busbar.

As shown in FIG. 2 (A), the conventional T-branch connection structure has T-branch bushings 3 and 4 mounted on the outer walls of the cubicles 1 and 2 constituting a gas insulated switch. It is provided with an inter-board communication bus bar 5. The T-branch bushings 3 and 4 accommodate T-branch fittings 3A and 4A. The connecting conductors 3B and 4B integrally formed with the T-branch fittings 3A and 4A penetrate the outer walls of the cubicles 1 and 2 and extend therein. The board-to-board communication bus 5 is composed of a short CV cable 6 and compression plugs 7A and 7B compression-connected to conductors exposed at both ends of the CV cable 6. The stress cones 8A and 8B are movably arranged on the CV cable 6.

Next, referring to FIG. 2, the cubicles 1 and 2 will be described.
The connection procedure between them will be described. First, as shown in FIG. 3A, one of the stress cones 8A of the inter-board communication bus bar 5 is CV.
Move on cable 6 to the center side. Next, as shown in FIG. 3B, the compression plug 7A of the CV cable 6
The end on the side is inserted into the T-branch bushing 3, and the T-branch fitting 3A is penetrated as shown in FIG.

Then, the CV cable 6 is pulled back, and the other end of the CV cable 6 is connected to the other T as shown in FIG.
Insert into the branch bushing 4 and insert the compression plug 7B into the T branch fitting 4A. As a result, both compression plugs 7A, 7B can be electrically connected to both T branch fittings 3A, 4A without bending the CV cable 6 having high rigidity.
After that, the stress cones 8A and 8B are pressed and fixed to the openings of the T-branch bushings 3 and 4 via pressing metal fittings (not shown), and the connection work is completed.

[0006]

By the way, in the above-mentioned conventional board-to-board connecting busbar mounting method, the board-to-board connecting busbar must always be tilted and the two terminals are slowly inserted into the T-branch bushing while inserting the terminal portion thereof into the T-branch bushing. It requires work to place it between the branch bushings. However, if the compression flag is hit against the opening of the T-branch bushing to damage the opening during such a work, it causes a problem in terms of electrical characteristics. Therefore, it requires extremely careful work. Also, the work of moving the stress cone on the CV cable requires extremely large force,
This also puts a heavy burden on the worker. The present invention has been made in view of the above points, and an object thereof is to facilitate the work of mounting the inter-board communication busbar and reduce the burden on the operator.

[0007]

A T-branch connecting structure of the present invention accommodates a T-branch metal fitting electrically connected to an internal circuit of a device, and a T-branch bushing fixed on an outer wall of the device, and a plurality of devices. Along the outer wall of the T-branch bushing of these devices, the inter-board communication busbars at both ends of which connecting portions are formed for electrical connection to the T-branch fittings.
The branch bushing was slidably supported on the outer wall of the equipment so that the terminal hole portion that receives the connection part of the inter-board communication busbar could be in two kinds of states, that is, the state where the terminal hole was kept away from the outer wall of the equipment and the state where they were brought close to each other. It is characterized by.

[0008]

Operation: Before mounting the inter-board communication busbar on the T-branch bushing, one T-branch bushing is raised beforehand on the outer wall of the device. After mounting the inter-board communication busbar on the T-branch bushing, the T-branch bushing is lowered again to return it to the same height as the other T-branch bushings. By slidably supporting the T-branch bushing in this manner, the inter-board communication busbar can be mounted while looking at the terminal holes of the T-branch bushing, the mounting becomes easy, and the T-branch bushing is not always damaged.

[0009]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is an explanatory view of an assembly procedure showing an embodiment of a T-branch connection structure of the present invention. (A)-(D) of a figure is an assembly procedure explanatory drawing which shows the T branch connection structure of this invention. As shown in (B) of this figure, in the present invention, at least one T-branch bushing 3 is supported slidably up and down on the outer wall of the device. That is, the terminal hole portion of the T-branch bushing 3 that receives the connection portion of the inter-board communication bus bar 5 is moved up and down so that it can be placed in a state of being separated from the outer wall of the device or in a state of being brought close to it.

FIG. 3 is a vertical sectional view showing a concrete example of such a T-branch bushing. As shown in the figure, the T-branch bushing 30 is surrounded by an insulating block 31 made of epoxy resin or the like, and a T-branch fitting 3A is arranged in the middle. The T-branch fitting 3A has a connecting conductor 3B connected and fixed to the central portion thereof for electrically connecting to an internal circuit of a device (not shown).

On the left and right of the insulating block 31, there are arranged terminal holes 33 for receiving the connecting portions of the inter-board communication busbars.
At the lower center of the insulating block 31, there is provided a neck portion 31 </ b> A that extends a little longer in a cylindrical shape. This neck 31A
Has a substantially circular cross-section that penetrates the outer wall 1A of the device. Then, a gasket 3 is provided between the outer wall 1A of the device and
2 is arranged to provide a gas seal between the inside and outside of the device. That is, the T-branch bushing 30 is slidably supported in the direction of arrow A in the figure in the state where the gas sealing is performed in this manner. Therefore, the T-branch bushing 30 can be slid upward or downward by the height difference L shown in the figure as a whole. That is,
A height difference corresponding to the length L is obtained between the state in which the apparatus is farthest from the outer wall 1A and the state in which the apparatus is closest to the outer wall 1A. It is preferable that the height difference L is selected to be equal to or larger than the outer diameter of the inter-board communication bus bar shown in FIG. The outer diameter of the inter-board communication busbar refers to the largest diameter portion near the terminal portion. This is because the mounting workability described later is taken into consideration.

Referring back to FIG. 1, the procedure for assembling the T-branch connection structure of the present invention will be described. First, as shown in FIG. 1A, devices such as the cubicles 1 and 2 have T-branch bushings 3 and 4 fixed on the outer walls thereof. When the inter-board communication bus bar 5 is mounted here, first, as shown in (B), one T-branch bushing 3 is pulled upward to be in a state of being furthest from the outer wall of the device. In this way, the operator does not tilt the board-to-board connecting busbar 5 and the operator carefully looks at the terminal hole of the T-branch bushing 3 and carefully pushes the compression plug 7A of the board-to-board connecting busbar 5 into the T-branch fitting 3A of the T-branch bushing 3.
Can be attached to. Then, after that, as shown in (C), the position of the T-branch bushing 3 is lowered, and the inter-board communication bus bar 5 and the T-branch bushings 3, 4 are connected in exactly the same manner as described with reference to FIG. Complete the electrical connection of.

With the above arrangement, the inter-board communication bus bar 5 can be easily attached to the one T-branch bushing 3, and if only one stress cone 8A is displaced, the other stress cone 8B can be used when the connection is completed. It is possible to work as it is. That is, for example, in the conventional method shown in FIG. 2, when a sufficient working space cannot be obtained or mounting is difficult, the stress cone on the opposite side needs to be slightly slid. However, in the case of the present invention, there is no such concern, and the amount of sliding of the stress cone 8A on the left side shown in the drawing can be made smaller to reduce the work load even a little.

The present invention is not limited to the above embodiments. The T-branch bushing of the above-described embodiment is slidably attached to the outer wall of the device through the gasket, but the structure for the gas seal, the structure for properly positioning the T-branch bushing, etc. can be freely selected. It doesn't matter. Of course, the amount of sliding may be at least a level difference such that the inter-board busbar hits another T-branch bushing and the work is not disturbed. Further, it is not necessary that the T-branch bushings of all the devices can be slid up and down, and the part where the work is easy may have a fixed conventional structure.

[0015]

The T-branch connection structure of the present invention described above accommodates the T-branch fittings electrically connected to the internal circuit of the device and is fixed on the outer wall of the device, and the T-branch bushing of a plurality of devices. A T-branch bushing of these devices is laid along the outer wall so as to connect between the T-branch bushings, and a board-to-board communication bus bar is provided at both ends to form a connecting portion electrically connected to the T-branch fitting.
The branch bushing slidably supports the terminal hole portion that receives the connecting portion of the inter-board communication busbar to the outer wall of the device so that it can be in two kinds of states, that is, a state in which the terminal hole portion is away from the outer wall of the device and a state in which the terminal hole portion is close to the outer wall of the device. With the inter-board communication busbars almost horizontal, the terminal holes of the T-branch bushing can be mounted so that they are clearly visible, which facilitates the work and prevents accidents such as scratching the T-branch bushing.

[Brief description of drawings]

FIG. 1 is an explanatory view of an assembly procedure showing a T-branch connection structure of the present invention.

FIG. 2 is an explanatory view of an assembly procedure showing a conventional T-branch connection structure.

FIG. 3 is a vertical cross-sectional view of a T-branch bushing suitable for implementing the present invention.

[Explanation of symbols]

 1, 2 cubicle 10, 11 T branch bushing 10A, 11A T branch metal fitting 12 Insulation busbar 13 CV cable 14, 15 Connection part 16, 17 Stress cone 18 First plug 19, 23 Second plug

Claims (1)

[Claims] 1. A T-branch bushing that houses a T-branch fitting electrically connected to an internal circuit of the device and is fixed on the outer wall of the device, and a T-branch bushing of these devices along the outer walls of the plurality of devices. And a board-to-board communication bus bar that is provided so as to connect the board to each other and has a connection part electrically connected to the T-branch metal fitting at both ends thereof, wherein the T-branch bushing is a terminal hole for receiving the connection part of the board-to-board communication bus bar. The part is slidably supported on the outer wall of the device so that the part can be in two kinds of states, that is, a state in which the part is separated from the outer wall of the device and a state in which the part is approached.
Branch connection structure.