JP2021170897A - DC switchboard - Google Patents

Abstract

To provide a DC switchboard allowing for adding an outside line cable while allowing for changing the route of the external cable inside the housing.SOLUTION: The DC switchboard includes within a housing: a circuit breaker and a disconnector; a wiring conductor connected to the circuit breaker and the disconnector; and a connecting conductor that is detachably attached to the wiring conductor and to which an external cable is connected. The connecting conductor has a bent portion in the horizontal direction to which multiple external cables may be connected.SELECTED DRAWING: Figure 1

Description

The present application relates to a DC switchboard.

Conventionally, when changing the arrangement of the internal equipment mounted on the switchboard or changing the specifications of the internal equipment, it is necessary to consider the pull-out direction of the external cable and secure a space for routing the external cable. It was also necessary to change the connecting conductor that connects the external cable terminals.

On the other hand, an uninterruptible power supply device equipped with a connecting device capable of connecting an electric device and an electric wire without bending the electric wire is disclosed (see Patent Document 1). A connecting conductor for connecting electric wires is attached to a support member that extends between the pillars of the frame of the housing, and the end of this conductor is placed at a position where the electric wires can be connected from the outside without bending, for L-shaped connection for each phase. Conductors are used to prevent the three-phase terminals from interfering with each other.

Japanese Unexamined Patent Publication No. 2016-20601

In the structure of Patent Document 1, if an electric wire is connected to one end of an L-shaped conductor, each phase can be taken out from the other end side. However, one end of the conductor is arranged according to the pull-out direction of the electric wire, and the cable routing is not considered inside the switchboard. In addition, it is not possible to cope with an increase in the number of external cable lines when installing the switchboard.

This application discloses a technique for solving the above-mentioned problems, and it is possible to change the route of the external cable inside the housing, and the external cable terminal can be used even when the number of external cable lines increases. It is an object of the present invention to provide a DC switchboard using a connecting conductor.

In the DC switchboard disclosed in the present application, a disconnector and a disconnector, a wiring conductor connected to the disconnector and the disconnector, and an external cable are detachably attached to the wiring conductor and connected to the outside line cable. A DC switchboard provided with a connecting conductor, the connecting conductor has a bent portion in the horizontal direction, and a plurality of external line cables can be connected.

According to the DC switchboard disclosed in the present application, the route of the external cable can be changed inside the housing, and the external cable can be added.

It is a side view which shows the schematic structure of the DC switchboard which concerns on Embodiment 1. FIG. FIG. 2A is an enlarged view of a part of the DC switchboard according to the first embodiment, FIG. 2A is an enlarged view of a region of a broken line A in FIG. 1, and FIG. 2B is an enlarged view seen from the back. It is a partial cross-sectional view of the DC switchboard which concerns on Embodiment 1, and is the cross-sectional view in the XX direction in FIG. FIG. 5 is a perspective view of a connecting conductor for connecting an external cable used in the DC switchboard according to the first embodiment. It is a perspective view which shows the state which attached the terminal of the external wire cable to the connecting conductor used for the DC switchboard which concerns on Embodiment 1. FIG. It is another partial enlarged view of the DC switchboard which concerns on Embodiment 1. FIG. It is a partial cross-sectional view of the DC switchboard which concerns on Embodiment 1, and is the cross-sectional view in the YY direction in FIG. FIG. 5 is a perspective view of another connecting conductor for connecting terminals of an external cable used in the DC switchboard according to the first embodiment.

Hereinafter, embodiments of the DC switchboard disclosed in the present application will be described with reference to the drawings. In each figure, the same reference numerals indicate the same or corresponding parts.

Embodiment 1.
Hereinafter, the DC switchboard according to the first embodiment will be described with reference to the drawings.
FIG. 1 is a side view showing a schematic configuration of the DC switchboard 100 according to the first embodiment. In the figure, the DC switchboard 100 includes a circuit breaker 2, a CT (current transformer) 4, and a disconnector 5 inside the housing 1 as an example. The current input from the outside is output from the bus 7 connected to the rear of the circuit breaker 2 to the wiring conductor 3a drawn from the rear of the circuit breaker 2 via the disconnector 2, and is output to the wiring conductor 3a drawn from the rear of the circuit breaker 2 via the CT4 on the lower side. Enter the disconnector 5. Normally, the circuit breaker 2 is closed and the disconnector 5 is also closed, so that current flows. The current that has passed through the disconnector 5 flows through the wiring conductor 3b to the connecting conductor 10 attached to the wiring conductor 3b, and flows from the external cable 6 connected to the connecting conductor 10 to the load outside the housing 1. In this embodiment, two disconnectors 5 are provided. The disconnector 5 arranged on the upper side serves as a detour and is used at the time of failure or maintenance. The bus 7 connected to the upper disconnector 5 is a detour bus, and the bus 7 connected to the circuit breaker 2 is the main bus.

FIG. 2 is an enlarged view of the region of the broken line A in FIG. 1, FIG. 2A is a partially enlarged view of a side surface of the DC switchboard 100, and FIG. 2B is an enlarged view of the same region as viewed from the back. FIG. 3 is a cross-sectional view taken along the line XX in FIG. In the figure, the wiring conductor 3b is arranged inside the housing 1 away from the panel, and the connecting conductor 10 is attached behind the circuit breaker 2 and below the disconnector 5. The connecting conductor 10 is an L-shaped bent conductor having two surfaces, a surface on the side surface side of the housing 1 and a surface bent from the surface and visible on the back surface side. The connecting conductor 10 is fastened to the wiring conductor 3b with four bolts on the surface visible on the back surface side of the housing 1. The external cable 6 has a terminal 6a attached to the connecting conductor 10 at the end. In FIGS. 2A and 2B, a part of the external cable 6 overlaps, but the terminal 6a of the external cable 6 of 1 is fastened to the connecting conductor 10 with four bolts, and the connecting conductor 10-2 It can be seen that the terminals 6a of the four external cable 6s are connected to each of the front and back surfaces. A total of eight external cable 6s are pulled out from the lower part of the housing 1 and connected to each load.

Further, as shown in FIG. 3, the connecting conductor 10 is composed of, for example, a plurality of conductors 11a and 11b in which a metal plate is bent, and a spacer 12 made of a conductive material is provided at a portion where the external cable 6 is connected. It has a sandwiching structure. With such a structure, the high voltage resistance is improved, and it is not necessary to thicken the individual conductors 11a and 11b, so that the bending process becomes easy.

Next, the structure of the connecting conductor 10 will be described.
FIG. 4 is a perspective view showing a state in which the connecting conductor 10 used in the DC switchboard 100 is attached to the wiring conductor 3b. FIG. 4A shows an example in which the connecting conductor 10 is L-shaped, FIG. 4B shows an example of a rectangular shape (rectangular U-shape), and FIG. 4C shows an example of a quadrangular shape. It is a structure having a bent portion.
FIG. 5 shows an example in which the terminal 6a of the external cable 6 is connected to each of the three types of connecting conductors 10 of FIG. 5A, 5B, and 5C are connection examples of the terminal 6a of the external cable 6 when the external cable 6 is pulled downward to the connecting conductor 10 having a shape corresponding to FIGS. 4A, 4B, and 4C, respectively. Further, FIGS. 5D, 5E, and 5F show connection examples of the terminal 6a of the external cable 6 when the external cable 6 is pulled out upward to the connecting conductor 10 having a shape corresponding to FIGS. 4A, 4B, and 4C, respectively. be.

As described above, the L-shaped connecting conductor 10 has the simplest structure having two surfaces 10a and 10b, and can connect up to eight external wire cables 6. Since the rectangular connecting conductor 10 has an additional surface 10c, the number of connectable external cable 6s increases, and similarly, the rectangular connecting conductor 10 has an additional surface 10d, so that the connectable external cable 6 can be further increased. To increase.

That is, the connecting conductor 10 can be selected according to the mounting condition of the member or device in the housing 1 and the required number of external wire cables 6, and the connecting conductor 10 can be replaced to connect the external cable. 6 can be increased.
Further, in preparation for the increase in the number of external cable 6, a connecting conductor 10 having a large number of connectable lines may be attached.

FIG. 5 shows an example in which the external cable 6 drawn out in either the downward direction or the upward direction is connected. However, as described above, the terminals of the external cable 6 are connected to all the connecting portions of the connecting conductor 10. It is not necessary to connect 6a, and it may be prepared for expansion. Further, depending on the load connected to the external line cable 6, the external line cables 6 in the upward direction and the external line cables 6 in the downward direction may be mixed.

Further, as shown in FIG. 1, when the external cable 6 is pulled out downward, the space behind the circuit breaker 2 can be utilized, but when it is pulled out upward, the disconnector 5 is mounted on the housing 1. It is difficult to pull it out behind. Therefore, it is desirable to attach the connecting conductor 10 to the inner side of the housing 1 with respect to the wiring conductor 3b.
FIG. 6 is a diagram for explaining an example in which the pull-out direction of the external cable 6 in FIG. 2A is changed from bottom to top. The solid wire connecting conductor 10A and the external cable 6A connected to the solid wire connecting conductor 10A are in the state before the change. By removing the connecting conductor 10A, attaching the connecting conductor 10B shown by the dotted line to the wiring conductor 3b, and connecting the external cable 6B to the connecting conductor 10B, the drawing direction of the external cable can be changed.

FIG. 7 is a partial cross-sectional view of the DC switchboard 100 showing the position of the connecting conductor 10B after the external cable 6 is changed to the upper drawer in FIG. 6, and is a cross-sectional view in the YY direction of FIG. As described above, the connection positions of the terminals 6a are symmetrical with respect to the connecting conductor 10 in the upper and lower drawers of the external cable 6. Therefore, by changing the direction of the L-shaped connecting conductor 10 and changing the attachment position to the wiring conductor 3b, the external cable 6 can be pulled out from the inner side of the housing 1 as compared with the case of the lower drawer. It will be possible.

Although the connecting conductor 10 having a different shape is shown in FIG. 8, when the outside wire cable 6 is expected to be pulled out in both the upper and lower directions, the surface 10e is formed with respect to the L-shape as shown in FIG. Further, a rectangular (rectangular Z-shaped) connecting conductor 10 such as a combination of two L-shaped conductors may be used.

As described above, according to the DC switchboard according to the first embodiment, at least the connecting conductor 10 attached to the wiring conductor 3b arranged inside from the housing 1 and to which the external cable 6 is connected is at least in the horizontal direction. Since the structure has one bent portion and is detachable from the wiring conductor 3b, that is, detachable, it is easy to add an external cable and change the drawing direction.

In the above embodiment, it has been stated that when the external cable 6 is pulled out upward, it is desirable to connect the cable 6 on the inner side of the housing 1 rather than in the case of the lower drawer. A bus 7 on the input side and a wiring conductor 3a on the output side are connected to the circuit breaker 2, and it is necessary to pull them out forward or backward for maintenance. In addition, considering maintenance of other devices, there are restrictions on the routing of the external cable 6 in the housing 1, such as arranging the disconnector 5 at the rear as in the example of FIG. Therefore, it is desirable that one of the upper and lower drawers be pulled out from the inside of the housing 1. If the connecting conductor 10 having at least one bent portion in the horizontal direction shown in the present embodiment is used, there are a plurality of taking-out directions and it is easy to attach and detach, so that there is a margin in the arrangement of the equipment inside the housing 1. Can have.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1: Housing, 2: Circuit breaker, 3a, 3b: Wiring conductor, 4: CT (current transformer), 5: Disconnector, 6, 6A, 6B: External cable, 6a: Terminal, 7: Bus, 10, 10A 10B: Conductor for connection, 10a, 10b, 10c, 10d, 10e: Surface, 11a, 11b: Conductor, 12: Spacer, 100: DC switchboard.

Claims (6)

The housing is provided with a circuit breaker and a disconnector, a wiring conductor connected to the circuit breaker and the disconnector, and a connecting conductor detachably attached to the wiring conductor and to which an external cable is connected. It is a DC switchboard,
A DC switchboard characterized in that the connecting conductor has a bent portion in the horizontal direction and a plurality of external cable can be connected. The DC switchboard according to claim 1, wherein the connecting conductor is any one of an L-shape, a rectangular U-shape, a quadrangular type, and a rectangular Z-shape. The DC switchboard according to claim 1 or 2, wherein the connecting conductor includes two conductors sandwiching a spacer. The wiring conductor to which the connecting conductor is attached is arranged so as to be separated from the housing.
The DC switchboard according to any one of claims 1 to 3, wherein the connecting conductor is attached to the wiring conductor behind the circuit breaker. The DC switchboard according to claim 4, wherein the connecting conductor is attached to the wiring conductor below the disconnector. When the external cable is pulled out upward of the housing, the connecting conductor is connected to the connecting conductor on the inner side of the housing rather than when it is pulled out downward of the housing. The DC switchboard according to any one of claims 1 to 5, wherein the DC switchboard is attached to.

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