JP3421453B2 - T-branch connection structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field 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 in S). 2. Description of the Related Art A cubicle-type gas insulated switch (C-GIS) has a structure in which devices such as a circuit breaker for each unit circuit are housed in a cubicle and an insulating gas (SF ₆ ) is filled at a low pressure. are doing. The cubicles are electrically connected by a T-branch connection structure including a T-branch bushing and an inter-panel communication bus. A conventional T-branch connection structure includes, as shown in FIG. 2A, T-branch bushings 3 and 4 mounted on outer walls of cubicles 1 and 2 constituting a gas-insulated switch. An inter-board communication bus 5 is provided. The T-branch bushings 3 and 4 accommodate T-branch fittings 3A and 4A. The connection conductors 3B and 4B formed integrally with the T-branch fittings 3A and 4A penetrate the outer walls of the cubicles 1 and 2 and extend therein. The inter-panel communication bus 5 is composed of a short CV cable 6 and compression plugs 7A and 7B that are 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. [0004] Next, referring to FIG.
The connection procedure between them will be described. First, as shown in FIG. 1A, one stress cone 8A of the inter-board communication bus 5 is connected to a CV.
Move to the center side on the cable 6. Next, as shown in FIG.
The terminal 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 as shown in FIG.
The compression plug 7B is inserted into the branch bushing 4 and fitted into the T-branch 4A. As a result, both compression plugs 7A, 7B can be electrically connected to both T-branches 3A, 4A without bending the highly rigid CV cable 6.
Thereafter, the stress cones 8A and 8B are pressed and fixed to the openings of the T-branch bushings 3 and 4 via pressing fittings (not shown), and the connection operation is completed. [0006] In the above-mentioned conventional inter-panel communication bus mounting method as described above, the inter-panel communication bus is always inclined, and the terminal is slowly inserted into the T-branch bushing while inserting the terminal into the T-branch bushing. An operation of arranging between the T-branch bushings is required. However, if the compression flag is hit against the opening of the T-branch bushing and damaged during such work, there is a problem in electrical characteristics. Therefore, very careful work is required. Also, the work of moving the stress cone on the CV cable requires extremely large force,
This also puts a heavy burden on workers. The present invention has been made in view of the above points, and has as its object to facilitate the work of mounting the inter-panel communication bus and to reduce the burden on the operator. [0007] A T-branch connection structure of the present invention accommodates a T-branch fitting electrically connected to an internal circuit of a device, and has a T-branch bushing fixed on an outer wall of the device. Along the outer walls of the plurality of devices, the device is laid so as to connect between T-branch bushings of these devices, and has inter-panel communication buses formed at both ends with connection portions electrically connected to T-branches.
The branch bushing is slidably supported on the outer wall of the device so that the terminal hole portion for receiving the connection portion of the inter-panel communication bus can be in two different states, one in which the terminal hole is separated from the outer wall of the device and the other in which the terminal hole is brought close. It is characterized by the following. Before the inter-panel communication bus is attached to the T-branch bushing, one of the T-branch bushings is raised on the outer wall of the equipment in advance. After attaching the inter-panel communication bus to 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 bus can be mounted while viewing the terminal hole of the T-branch bushing, mounting is facilitated, and the T-branch bushing is not always damaged. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is an explanatory view of an assembling procedure showing an embodiment of a T-branch connection structure of the present invention. (A)-(D) of the figure are assembly procedure explanatory views showing a T-branch connection structure of the present invention. As shown in FIG. 1B, in the present invention, at least one T-branch bushing 3 is supported on the outer wall of the device so as to be slidable up and down. That is, the terminal hole portion of the T-branch bushing 3 that receives the connection portion of the inter-panel communication bus 5 is moved up and down so as to be able to take a state away from the outer wall of the device and a state close to it. FIG. 3 is a longitudinal sectional view showing a specific embodiment of such a T-branch bushing. The T-branch bushing 30 is surrounded by an insulating block 31 made of epoxy resin or the like as shown in the figure, and a T-branch fitting 3A is arranged in the middle. The T-branch 3A has a connection conductor 3B for electrical connection with an internal circuit of a device (not shown) fixedly connected to the center thereof. On the left and right sides of the insulating block 31, there are arranged terminal holes 33 for receiving the connection portions of the inter-panel communication buses.
At the lower center of the insulating block 31, a neck portion 31A that extends slightly long in a columnar shape is provided. This neck 31A
Has a substantially circular cross section penetrating the outer wall 1A of the device. Then, a gasket 3 is placed between the outer wall 1A of the device.
2 is provided to perform gas sealing between the inside and the outside of the device. In other words, the T-branch bushing 30 is supported so as to be slidable in the direction of arrow A in FIG. 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 two types of states that are farthest from the outer wall 1A of the device and closest to the outer wall 1A. It is preferable that the height difference L be selected so as to be equal to or larger than the outer diameter of the inter-panel connecting bus shown in FIG. Note that the outer diameter of the inter-panel communication bus refers to the portion having the largest diameter near the terminal portion. This is because the mounting workability described later is considered. Returning to FIG. 1, the procedure for assembling the T-branch connection structure of the present invention will be described. First, as shown in FIG. 1 (A), T-branch bushings 3 and 4 are fixed on outer walls of devices such as cubicles 1 and 2. When the inter-panel communication bus 5 is to be mounted here, first, as shown in (B), one T-branch bushing 3 is pulled upward to make the bushing 3 farthest from the outer wall of the device. In this case, the compression plug 7A of the inter-panel communication bus 5 is carefully connected to the T-branch 3A of the T-branch bushing 3 without tilting the inter-panel communication bus 5 and looking at the terminal hole of the T-branch bushing 3.
Can be attached to Then, as shown in (C), the position of the T-branch bushing 3 is lowered, and the inter-panel communication bus 5 and the T-branch bushings 3 and 4 are connected in exactly the same manner as described below with reference to FIG. To complete the electrical connection. In this way, it is easy to mount the inter-board communication bus 5 to one of the T-branch bushings 3, and if only one of the stress cones 8A is displaced, the other stress cone 8B is connected to the one when the connection is completed. Work can be performed in the state. That is, for example, in the conventional method shown in FIG. 2, when a sufficient working space cannot be obtained or when mounting is difficult, it is necessary to slightly slide the stress cone on the opposite side. However, in the case of the present invention, there is no such a concern at all, and the sliding amount of the left-side stress cone 8A shown in the figure can be made small, and the work load can be reduced even a little. The present invention is not limited to the above embodiment. Although the T-branch bushing of the above embodiment is slidably mounted on the outer wall of the device via a gasket, the structure for the gas seal and the structure for appropriately positioning the T-branch bushing can be freely selected. No problem. Of course, the slide amount only needs to be such a level difference that at least the inter-board bus does not impede the work by abutting the other T-branch bushing. In addition, the T-branch bushings of all the devices do not need to be slidable up and down, and the easy-to-work portion may be of a fixed conventional structure. The T-branch connection structure of the present invention described above accommodates a T-branch fitting electrically connected to the internal circuit of the device, and includes a T-branch bushing fixed on the outer wall of the device, Along the outer wall of the device, the T-branch bushing of these devices is laid so as to connect them, and at both ends there are inter-panel communication buses having connection portions electrically connected to the T-branch fittings.
The branch bushing slidably supports the terminal hole portion for receiving the connection portion of the inter-panel communication bus so that the terminal hole portion can be slid on the outer wall of the device so that the terminal hole portion can be in a state of being separated from the outer wall of the device or in a state of approaching the terminal hole portion. The T-branch bushing can be mounted with the terminal hole portion of the T-branch bushing visible, with the inter-panel communication bus being substantially horizontal, thereby facilitating the operation and preventing the T-branch bushing from being damaged.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an assembling procedure showing a T-branch connection structure of the present invention. FIG. 2 is an explanatory view of an assembling procedure showing a conventional T-branch connection structure. FIG. 3 is a longitudinal sectional view of a T-branch bushing suitable for carrying out the present invention. DESCRIPTION OF SYMBOLS 1, 2 cubicle 10, 11 T-branch bushing 10A, 11A T-branch fitting 12 Insulated busbar 13 CV cable 14, 15 Connection part 16, 17 Stress cone 18 First plug 19, 23 Second plug

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02B 1 / 20,1 / 30 H02B 13/00-13/08

Claims (1)

(57) Claims 1. A T-branch bushing, which accommodates a T-branch fitting electrically connected to an internal circuit of a device, is fixed on an outer wall of the device, and extends along an outer wall of the plurality of devices. And an inter-panel communication bus bar which is laid so as to connect between the T-branch bushings of these devices, and has a connection portion formed at both ends to be electrically connected to the T-branch fitting. The terminal hole portion for receiving the connection portion of the communication bus is slidably supported on the outer wall of the device so that the terminal hole portion is separated from the outer wall of the device and the terminal hole portion can be brought into two states.
Branch connection structure.