JPS6226967Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a closed switchboard in which a bus bar passes through adjacent panels.

[Technical background of the invention and its problems]

The depth dimensions of the closed switchboard are as shown in Figure 1.
It is determined by the sizes of the circuit breaker room 2, busbar room 3, and cable room 4. The size of the circuit breaker chamber 2 is determined by the circuit breaker 5, and the size of the cable chamber 4 is determined by the current transformer 6 and the processing dimensions of the cable 7. To make these smaller, it is necessary to downsize circuit breakers, current transformers, cables, etc., but this is difficult. Further, the size of the busbar chamber 3 is determined by the dimensions of the busbar 8 determined by the current capacity and the insulation distance between the busbar 8 and the ground.

By the way, the insulation distance of a closed switchboard is based on a value determined by the impulse breakdown voltage in air of a rod-rod gap multiplied by a safety factor.

FIG. 2c shows the impulse breakdown characteristic 9A of the rod-to-bar gap L shown in FIG. 2b, and the impulse breakdown characteristic 10A of the gap L of the electrode 10 with rounded ends shown in FIG. In this way, the rod-rod electrode is
Requires a wider insulation gap than rounded electrodes.

FIG. 3 shows the structure of a conventional busbar chamber viewed from the AA cross section in FIG. 1. W is the board width and bus line 8 is the board body 1
It is connected to the adjacent board through a rectangular opening 11 provided on the side of the board. Reference numeral 12 denotes a side plate, and one side of shaped steel 13, 14 is welded to the side plate 12 on the four sides of the opening 11 so that one side thereof is flush with the other. Then, side plate 1
2 and the ends 15 of the shaped steels 13 and 14 (both are sharp), the electrical characteristics between the busbars 8 are close to the characteristics 9A of the bar electrode 9, and a gap is required, so the busbar chamber 3 is made smaller. Can not. Reference numeral 16 denotes an inter-board bush through which the bus bar 8 passes and partitions the opening, and 17 is its mounting base, which is bent on both sides. The installation is performed by inserting one's hand into the busbar chamber 3.

[Purpose of invention]

The object of the present invention is to provide a closed switchboard in which the bus bar room can be made smaller and the bushings between the panels can be easily installed.

[Example of idea]

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

Figure 4 shows the busbar chamber 3 of the present invention corresponding to Figure 3.
(However, in the case of the last board in a row of boards), reference numeral 8 denotes a bus bar, which connects adjacent boards by penetrating through the opening 11 as in the conventional case. 13' and 14' are J-shaped steels that face the upper and lower sides of the opening 11, and the bottom part 16 protrudes toward the generatrix 8 side than the cut surface of the side plate 12', and its outer surface touches the inner surface of the side plate 12'. and weld.

In other words, the J-beam has a bottom part 1 with curved parts on both sides.
6 toward the bus bar 8.

As a result, the electric field concentrated at the edge of the L-shaped blade and the sheared part of the side plate 12 is alleviated by the bent bottom 16 at both ends, and the electric field between the J-shaped steel 13', 14' and the bus bar 8 is reduced. The characteristics become close to 10A in FIG. (The cut surface of the side plate 12' is not affected by the J-shaped steels 13' and 14' that protrude inward.) Therefore, the distance between the busbar 8 and the J-shaped steels 13' and 14' can be shortened, and the busbar chamber 3 can be made smaller. Further, when installing the inter-panel bushing 16 for preventing the spread of an accident, the mounting base 17' can also be easily installed by drilling a hole in the steel plate and tightening it from the outside with a countersunk bolt or the like. Similarly, it is easy to block the busbar chamber at the final end with the blind plate 18 when the panels are stacked side by side, or to remove them when expanding.

In the above embodiment, the J-beams were provided on the four sides of the opening, but if there is sufficient space in the vertical direction of the opening, they may be provided only in the depth direction.

Furthermore, since the J-shaped steel only needs to have curved parts on both sides of the bottom, it may be U-shaped.

[Effect of idea]

As described above, according to the present invention, it is possible to obtain a closed power distribution board that has a small external size and allows for easy installation and removal of the bushings between the panels.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a conventional closed switchboard, Figures 2a and b are explanatory diagrams showing different types of gap shapes, Figure c is an explanatory diagram showing impulse breakdown characteristics due to different gap types, and Figure 3 is an explanatory diagram showing impulse breakdown characteristics due to different gap types. FIG. 4 is a horizontal sectional view showing an embodiment of the busbar chamber structure of a closed switchboard according to the present invention. 1...Panel body, 12'...Side plate, 13', 1
4'...shape steel, 16...button between plates, 17'...
mounting base.

Claims (1)

[Scope of claim for utility model registration] Circuit breaker chambers provided above and below in the front part of the box body,
A busbar chamber provided at the rear of the circuit breaker chamber, through which a high-voltage bus bar connected to the circuit breaker chamber passes through a rectangular opening made in the side plate of the box body between adjacent rows of panels, and a rear section of the busbar chamber. In a closed switchboard consisting of a cable room provided in the circuit breaker room and in which cables connected to the outside are arranged, a long cable is installed inside the side plate on at least two sides of the opening, with the bottom facing the bus bar. A closure characterized by comprising: a J-beam to which a side end is attached; and a mounting base for attaching an inter-panel bushing attached from the outside to the outer surface of the J-beam attached to the inside of the side plate. switchboard.