JPS6013364B2 - closed switchboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a closed power distribution board, and more particularly to a cable connection arrangement for a multi-tiered closed power distribution board.

In recent years, electrical equipment such as circuit breakers that are housed in closed switchboards have become smaller, and it has become possible to store multiple units in multiple stages within a closed switchboard of the same height as before.

However, even though electrical equipment can be stacked in three or four tiers, the layout of the cables and busbars that are connected to them becomes complicated, so in reality, stacking them in multiple tiers like this results in a large closed switchboard. become This goes against the intended purpose of accommodating more electrical equipment within a closed 5 switchboard in a limited space, so it cannot be put to practical use. To explain the reason for this in more detail, the power supply busbars are generally drawn horizontally into a closed switchboard, and each stacked disconnector is connected to the power supply busbars via a branch conductor. Ru.

In this case, the power supply busbar is generally drawn into the middle or upper part of the panel frame. However, if the board is stacked in two levels and there is relatively enough space within the board, the above-mentioned retracted position may be used, but if the board is stacked in more than two levels, a problem will occur. Immediately,
When the cable is drawn from the floor, the connection part with the conductor inside the panel must be located approximately 1 meter or more from the floor in order to accommodate the cable end processing dimensions. However, in the case of multi-tier stacking, the cable connection terminal of the lowest electrical equipment cannot maintain the above height as it is, and it is necessary to bend the internal conductor upward to ensure the height of the cable connection part.
If you place the connection part of the bottom row above in this way,
Due to the insulation distance, etc., those in higher stages must also be placed upwards in sequence. For this reason, as mentioned above, it is difficult in terms of space to draw the power supply bus into the middle or upper part of the frame, and it is unavoidable to increase the external size of the panel. Further, the connection portions with the cables were arranged sequentially toward the back from the lower tier to the upper tier so that the cables in each tier would not overlap with each other.

However, in this method, as the number of stacks increases, the depth also increases, so the size has to be increased. Z [Object of the invention]
An object of the present invention is to provide a closed power distribution board that allows electrical equipment to be stacked in multiple stages without increasing the external size of the board by rationally arranging conductors provided inside.

2 [Embodiment of the Invention] The present invention will be described below with reference to an embodiment shown in the drawings.

In FIG. 1, reference numeral 11 denotes a box-shaped panel frame, and on the inside front side, that is, on the left side of the figure, a plurality of electrical devices (four in this embodiment), such as a disconnector 212, are installed. The equipment chambers 13 are arranged in multiple stages, each of which is accommodated in a drawable manner. Further, a conductor chamber 14 is formed on the back side of the panel frame 11, that is, on the right side in the figure. Main circuit disconnecting sections 15 and 16 are provided between each of the equipment rooms 13. Above main circuit disconnection 3 part 15
, 16 are connected to the main circuit terminals 12a, 12b provided on the back surface of the sheath breaker 12, and the main circuit terminals 12a, 12b are connected to each other as they move in the direction of entry and exit. The disconnecting section 15 that is separated is for the subsequent cable, and is connected to the lower terminal 12.
The disconnection 35 section 16 that is separated from b is for busbar connection. 18
is a conductor for cable connection, one end of which is connected to the cable connection disconnection section 15.

In addition, the height of the cable end should be secured in the middle part.
It is bent upward, and its tip becomes a connection part 21 with a cable 20 pulled in from the floor of the panel frame 11. The cable connection conductor 18 connected to the cable connection disconnection part 15 at the top level can use the space because the bus bar is not drawn upwards in the panel frame 11. Therefore, as shown in the figure, by only slightly moving it upward via the vertical portion 18'a, it can be installed almost horizontally. However, the connection part 21 with the cable 20 is arranged at a position on the back side P, that is, on the right side in the figure, with respect to the other connection parts 21. Further, in the figure, reference numeral 23 is a support insulator for the conductor 18 or 18', and 24 is a current transformer. Reference numeral 28 denotes a power supply busbar, which is drawn horizontally from the side into a lower space created by bending the busbar connection conductor 18 at the lowest stage upward.

A vertical busbar 29 is drawn out from the power supply busbar 28 and connected to the busbar-side disconnection section 16 corresponding to each step or disconnector 12, respectively. If the power supply bus bar 28 is drawn into the space below the lowest bus bar saddle twill conductor 18 in this way, the panel frame 11 can be enlarged especially in the height direction, as in the case of drawing it into the upper part or middle part of the conventional panel frame. It can be configured without any need.

Further, the two cables are drawn into substantially the same depth position when viewed from the cable cutter 12.

This retracted position corresponds to the cable connection 2 of the uppermost conductor 18'.
It should be set almost directly below 1. However, since the cables 21 will overlap with each other in this state, the cables 20 and cable supports 25 are sequentially arranged alternately in the board width direction, and the cables 20 are arranged side by side at the same depth position, as shown in FIG. In the figure, numeral 26 denotes an open-phase current transformer, which is provided for each cable 20. With this configuration, there is no need to shift the cable connection part 21 in the depth direction for each stage as in the conventional case, so the panel frame! 1 can be shortened, and each cable 20 can be arranged in an orderly manner without overlapping each other.

〔Effect of the invention〕

As described above, according to the present invention, when configuring a multi-tiered closed power distribution board, the space within the panel frame is utilized to rationally arrange the power bus bars, cables, etc., which is difficult to do in the conventional conductor arrangement. It is possible to adopt the multi-tiered structure without increasing the size of the box frame.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of a closed switchboard according to the present invention, and FIG. 2 is a view taken along arrow 0-0 in FIG. 11...Panel frame, 12...Electrical equipment, 12a...
Cable connection terminal, 12b...Bus bar connection terminal, 1
8, 18'...Cable connection conductor, 20...Cable, 21...Cable connection portion, 28...Power bus bar, 2
9... Vertical generatrix. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. In a case where a plurality of electrical devices are housed in multiple stages within a panel frame, each of the electrical devices except for the one at the top tier has a cable connection terminal connected to the panel frame. Connect the cable connection conductor that is bent in the upper case to maintain the cable terminal height with respect to the floor surface, and draw the power bus bar into the space formed below the cable connection conductor on the back of the lowest electrical equipment. , the power supply side terminals of each stage of electrical equipment are connected to the vertical busbar branched from this power supply busbar, and the cable connection conductor extending almost horizontally is connected to the cable connection side terminal of the topmost electrical equipment, and these cable connections are made. A closed switchboard in which each drop-in cable is connected to its corresponding electrical equipment via a conductor. 2. In a case where a plurality of electrical devices are housed in multiple stages within a panel frame, each of the electrical devices except for the one on the top tier has a cable terminal connected to the floor surface of the panel frame. Connect the cable connection conductor that is bent upward to maintain the processing height, draw the power bus into the space formed below the cable connection conductor on the back of the lowest electrical equipment, and branch out from this power bus. Connect the power supply side terminals of each stage of electrical equipment to the vertical busbar, and connect cable connection conductors that extend almost horizontally to the cable connection terminals of the top stage electrical equipment, and connect each lead-in through these cable connection conductors. A closed power distribution board that connects cables to corresponding electrical equipment, and in which these cables are arranged side by side at positions with approximately the same depth dimension when viewed from the electrical equipment side.