JPS649802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed switchboard device, and more particularly to a closed switchboard device that houses a drawer type or a disconnector, and has an improved bushing structure.

FIG. 1 is a partially sectional plan view showing a conventional closed switchboard device, and FIG. 2 is a partially sectional side view of FIG. 1. In Figures 1 and 2, closed switchboard 1
The drawer shape and cutter 2 with built-in chopsticks and cutting parts 2a are stored in a drawable manner. The bushing 3 for the cutter is attached to the drawer-shaped cutter 2 and connects the first and second terminal conductors 4a and 4b of the drawer-shaped cutter 2.
These first and second terminal conductors 4a and 4b constitute a breakout side terminal device, and the breakage portion 2a supports these terminal conductors 4.
It is connected between a and 4b. The switchboard bushing 5 is attached to the closed switchboard 1 and the terminal conductor 4
The first terminal conductor 6 on the power supply side connected to a, 4b
a and a second terminal conductor 6b on the load side, and these first and second terminal conductors 6
a and 6b constitute a switchboard side terminal device. The main bus conductor 7, which is the primary power source, is inserted laterally through the closed switchboard 1 and housed therein, and is connected to the first terminal conductor 6a on the power source side. The power cable 8 is housed at its end in the closed switchboard 1,
It is connected to the second terminal conductor 6b on the load side. The through-type current transformer 9 is configured to detect a circuit current by inserting the second terminal conductor 6b or the power cable 8 through the hollow portion thereof.

Next, the operation will be explained. If the drawer type or disconnector 2 is currently turned on, the current flows from the main bus conductor 7 to the first terminal conductor 6a of the terminal device on the switchboard side to the terminal device on the disconnector side for each of the three phases. → the first terminal conductor 4a of the drawer type disconnector 2 → the second terminal conductor 4b of the disconnector side terminal device → the second terminal conductor 6b of the switchboard side terminal device → the closed circuit of the power cable 8 As a result, the main bus conductor 7 and the power cable 8 are connected. On the other hand, when the drawer type or disconnector 2 is cut, the cutter part 2a opens and the main bus conductor 7 and the power cable 8 are cut off.

The conventional switchboard device is constructed as described above, and requires a total of six bushings, including the bushings 3 for the circuit breakers for three phases and the bushings 5 for the switchboard for three phases, and requires an insulating distance between them. do. This has resulted in the disadvantage that the closed switchboard 1 becomes large. In addition, since the sheath section 2a is installed inside the drawer-shaped cutter 2, depending on the external environment, the sheath section 2a may
There was also the disadvantage that the insulating material surface of the shingle cut portion 2a was deteriorated due to contamination (e.g., adhesion of dust, dew condensation, chemical corrosion).

This invention has been made to eliminate the drawbacks of the conventional ones as described above, and includes the first and second terminal conductors 4a and 4b of the terminal device on the side of the disconnector and the first and second terminal conductors of the terminal device on the switchboard side. second terminal conductor 6a,
6b are concentrically insulated and supported by the same bushings, and these bushings
The first and second terminal conductors of the breaker-side terminal device are insulated and supported by utilizing the fact that the diameter is large enough to withstand the high open circuit voltage between the terminal conductor and the second terminal conductor. Drawer type or disconnector 2 inside the bushing
In the case of a three-phase circuit, it is configured with three bushings by storing the bushing and the disconnection part 2a,
It is an object of the present invention to provide a closed switchboard device which can be miniaturized, and which is free from the risk of contamination of the shingle cut portion 2a and which is free from deterioration of the insulation performance of the insulating material surface due to contamination. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a partially sectional plan view showing an embodiment of the closed switchboard device according to the present invention, and FIG. 4 is a partially sectional side view of FIG. 3. In the figure, the same or equivalent parts as in FIGS. 1 and 2 are designated by the same reference numerals. In FIGS. 3 and 4, the bushing breaker bushing 3 has a convex shape, with a rod-shaped second terminal conductor 4b in the center and an annular first terminal conductor 4a.
are insulated and supported on concentric circles centered on the second terminal conductor 4b. Bushing for switchboard 5
A rod-shaped second terminal conductor 4b is formed in the center and has a concave shape so that a chopstick or disconnection bushing 3 can be fitted and inserted therein.
A rod-shaped second terminal conductor 6b is connected to the second terminal conductor 6b, and a ring-shaped first terminal conductor 6a connected to the annular first terminal conductor 4a is concentric with the second terminal conductor 6b on the inner peripheral surface. Supports insulation. Further, the sheath cut portion 2a is housed within the sheath cutter bushing 3. The insulating rod 10 connects the sheath section 2a to an opening/closing mechanism (not shown) that opens and closes the sheath section 2a.

The present invention is constructed as described above, in which the first terminal conductor 4a and the second terminal conductor 4b are insulated and supported concentrically by the bushing 3 for a circuit breaker, and the bushing 5 for a switchboard , so that the first and second terminal conductors 6a and 6b are connected to corresponding ones of the first and second terminal conductors 4a and 4b of the breaker side terminal device, that is, the switchboard side terminal device The first terminal conductor 6a is connected to the first terminal conductor 4a of the breaker side terminal device, and the terminal conductor 6b is insulated and supported concentrically so as to be connected to the terminal conductor 4b. Therefore, by fitting and inserting the three-phase disconnector bushing 3 into the three-phase switchboard bushing 5, the main bus conductor 7, which is the primary power source, can be connected to the load side via the drawer or disconnector 2. It can be connected to the power cable 8 of 3, and it looks like three bushings are arranged in terms of appearance and dimensions. Therefore, the number of bushings required is reduced, and the closed switchboard 1 can be made smaller.

In addition, a bushing section 2a and a bushing 3
Since it is housed inside, there is no fear that it will be contaminated by the external environment and that the insulation performance of the insulating material surface of the cut portion 2a will deteriorate.

FIG. 5 is a partially sectional plan view showing another embodiment of the closed switchboard device according to the present invention, and FIG. 6 is a partially sectional side view of FIG. 5. In FIGS. 5 and 6, the breaker bushing 3 includes a first convex portion 3a that insulates and supports a rod-shaped second terminal conductor 4b;
The annular first convex portion 3a is formed concentrically with the first convex portion 3a.
and a second convex portion 3a that insulates and supports the terminal conductor 4a. The switchboard bushing 5 has a first concave portion 5a into which a first convex portion 3a is fitted and inserted and insulatingly supports a rod-shaped second terminal conductor 6b, and a second convex portion 3b which is fit and inserted into an annular concave portion 5a. and a second recess 5b that insulates and supports the first terminal conductor 6a. It is clear that the embodiments shown in FIGS. 5 and 6 also provide the same effects as the embodiments shown in FIGS. 3 and 4.

FIG. 7 is a partially sectional side view showing still another embodiment of the closed switchboard device according to the present invention. That is, the embodiments shown in FIGS. 3 to 6 are of a three-phase vertical arrangement, but the embodiment of FIG. 7 is a three-phase vertical arrangement, and there is no change in the effect.

Note that the first terminal conductor 6a on the power supply side is connected to the power cable 8 as a terminal conductor on the load side, and the second terminal conductor 6b on the load side is connected to the main bus conductor 7 as a terminal conductor on the power supply side. Good too.

As described above, according to the present invention, the first and second terminal conductors of the breaker-side terminal device and the switchboard-side terminal device are insulated and supported concentrically by the same bushing, thereby providing the required bushing. In addition, the number of closed switchboards can be reduced and the size of the closed switchboard can be reduced.
By housing the shingle cut portion in the bushing that insulates and supports the terminal conductor of the bushing, various effects can be obtained, such as preventing deterioration of the insulation performance of the insulation surface of the shingle cut portion due to contamination.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional plan view showing a conventional closed switchboard device, Figure 2 is a partial cross-sectional side view of Figure 1, and Figure 3 is a partial cross-sectional side view of Figure 1.
The figure is a partially sectional plan view showing one embodiment of the closed switchboard device according to the present invention, FIG. 4 is a partially cross-sectional plan view of FIG. 3, and FIG. FIG. 6 is a partially sectional side view of FIG. 5, and FIG. 7 is a partially sectional side view showing still another embodiment of the closed switchboard device according to the present invention. In the figure, 1 is a closed switchboard, 2 is a drawer type or disconnector, 2a is a cutter or disconnection part, 3 is a bushing for a cutter or a cutter, 4a and 4b are the first and second terminals of the cutter or disconnector side terminal device. Conductor, 5 is a bushing for the switchboard, 6a,
6b is the first and second terminal conductor of the terminal device on the switchboard side, 7 is the main bus conductor, and 8 is the power cable.
In addition, the same reference numerals are given to the same parts and corresponding parts in each figure.

Claims (1)

[Claims] 1. A closed switchboard device consisting of a closed switchboard and a drawer or disconnector housed within the closed switchboard, wherein the drawer or disconnector is connected to a first terminal conductor and a second terminal conductor. The closing switchboard includes a terminal device on the terminal device on the terminal device and a terminal conductor connected between the first and second terminal conductors, and the closing switchboard connects the first terminal conductor of the terminal device on the terminal device on the terminal device in the terminal device. In a closed switchboard device having a switchboard side terminal device comprising a first terminal conductor connected to a terminal conductor and a second terminal conductor connected to a second terminal conductor, the first terminal device of the shield breaker side terminal device The terminal conductor and the second terminal conductor are insulated and supported concentrically by the same bushing, and the sheath cut portion is housed within the bushing, and the terminal conductor and the second terminal conductor are further connected to the first terminal conductor of the switchboard side terminal device. The second terminal conductor is one that is insulated and supported concentrically by the same bushing so as to be connected to the corresponding first terminal conductor and second terminal of the above-mentioned breaker-side terminal device. A closed switchboard device featuring: