JP2889660B2 - Multi-stage closed switchboard - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a front-maintenance type multi-stage closed switchboard.

(Conventional technology) Conventionally, in order to reduce the installation area of a closed switchboard, a multi-tiered closed switchboard that houses the circuit breaker by dividing the inside into upper and lower sections has been adopted. Floor space is constantly shrinking. On the other hand, there is an increasing demand for a front-maintenance type in which the interior can be easily maintained and inspected from only the front, even if the interior is installed so that the rear is in contact with the wall in the building.

FIG. 14 shows an example of a front view of a front-maintenance type multi-stage closed switchboard using a conventional horizontal draw-out type circuit breaker with a front door opened, and FIG. The main body 2 is mounted on a drawer unit 3 provided with a main circuit disconnecting portion 1 at a rear portion. At the rear portion of the drawer unit 3, outlet terminals 4A and 4B for connection with a board-side conductor are provided. The lead end 4A on the power supply side is connected to the common bus bar 5 and the lead terminal 4B on the load side is connected to the cable 7 on the load side via a current transformer 6 arranged on the right side of the drawer unit 3 by an electric wire 8. . A vertical bus 9 connecting the common bus 5 and the lead-out terminal 4A of each drawer unit 3 is vertically arranged at the rear of the drawer unit 3.

Further, as shown in FIG. 16 showing an example of a conventional multi-stage closed switchboard different from FIG. 14 and FIG. 15, the drawer unit 3 and the auxiliary equipment unit 10 on which the instrument transformer and the like are mounted are stored vertically. Thus, even when the current transformer 6 is provided between the drawer unit 3 and the common bus 5, the connecting conductor 11 is three-dimensionally configured as described later.

(Problem to be Solved by the Invention) However, in the multi-stage closed switchboard configured as described above, the vertical bus 9 and the lead-out terminal 4B of the drawer unit 3 are provided.
Therefore, the required insulation distance 1 shown in FIG. 15 must be secured, so that the depth dimension cannot be reduced. Also, the outlet terminal 4B of the drawer unit 3 and the cable 7
The wire 8 and the connecting conductor 11 on the load side for connecting to the current transformer 6 are connected in a three-dimensionally bent manner while twisting while avoiding interference between different phases in order to maintain required insulation between different phases. Therefore, the shape of the connection conductor 11 is complicated, the number of parts is increased, and the assembling workability is deteriorated. Furthermore, at the time of connection work between each current transformer 6 and the cable 7, the current transformer 6 hindered the operation. In addition, every time the vertical bus 9 is inspected, the storage device such as the circuit breaker 2 has to be carried out of the box every time.

Furthermore, the vertical bus 9 on the power supply side and the lead terminal 4B on the load side
Are arranged in front and rear, so that even when checking the cable 7, the bus 5 must be disconnected from the power supply in order to prevent an electric shock due to the entry of a surge voltage and perform a safe check.

Furthermore, if the vertical bus 9 on the power supply side and the cable room of the circuit breaker 2 were separated from each other,
In order to obtain the “metal clad type” in section 3.102.1,
In the conventional configuration, the output terminals 4A and 4
Since the way of inserting the metal partition plate became very complicated for B, the outer dimensions of the box had to be increased with the depth of the board.

Accordingly, an object of the present invention is to provide a multi-stage closed switchboard that can be installed easily with a reduced installation floor area.

(Means and Actions for Solving the Problems) One of the present inventions is a bus partition that is provided vertically on one side on the left and right sides of a box body and forms a bus chamber for accommodating a vertical bus bar on the outside of one side, and another bus partition. A cable partition that is vertically installed on the side and separates the inner equipment room and the outer cable room, and is stored in the upper and lower tiers in the equipment room and individually driven up and down by the lifting mechanism, and the movable main circuit terminal on one side and the other side on the upper side Is connected to the movable main circuit terminal of the main circuit device, which is erected and connected to the bus partition and the cable partition, one side is connected to the cable of the cable room and the vertical bus, and the lower end is raised by the lifting mechanism. The present invention is a multi-stage closed switchboard which is easy to assemble and has a reduced installation floor area by providing a lead conductor, and another aspect of the present invention is a vertical busbar installed vertically in the center of the box body and inside. To house the bus room to form one A bus partition, a cable partition vertically provided on both left and right sides of the bus partition to separate an inner device room and an outer cable room, and stored in the device room in upper and lower tiers and individually driven up and down by a lifting mechanism and one side of the upper portion And main circuit equipment with movable main circuit terminals standing on the other side and main circuit equipment that penetrates the bus partition and cable partition, one side is connected to the cable in the cable room and the vertical bus, and the lower end is raised by the lifting mechanism With a lead-out conductor connected to the movable side main circuit terminal of the multi-stage closed switchboard which is easy to assemble and has a reduced installation floor area. And an L-shaped busbar partition provided on the upper side and forming a busbar chamber for storing one outer vertical busbar and the upper horizontal busbar, and an inner equipment room and an outer cable chamber vertically provided on the other side of the busbar partition. Partitioning And main circuit equipment, which is housed in the equipment room in upper and lower tiers and is individually driven up and down by the elevating mechanism and movable main circuit terminals are set up on one side and the other on the upper side, and through the busbar partition and cable partition And a lead conductor connected to the movable main circuit terminal of the main circuit device, one end of which is connected to the cable in the cable room and the vertical bus, and the lower end of which is raised by the elevating mechanism. It is a multi-stage closed switchboard that has been reduced.

(Embodiment) Hereinafter, one embodiment of the multi-stage closed switchboard of the first, second, and third inventions will be described with reference to the drawings. However, parts overlapping with FIGS. 14 to 16 are omitted.

FIG. 1 is a front view of a multi-stage closed switchboard of the first invention, and FIG. 2 is a side view taken along the line AA of FIG.

1 and 2, in a closed box provided with a door (not shown) for inspection on the front side, a busbar room 21 bent into an L shape from the upper end to the left side, a circuit breaker room 20 on the lower right side thereof, and A common bus bar 5 in which conductors of each phase are arranged in the depth direction is connected to the upper end of the bus bar room 21 at the upper end of the bus bar room 21 so as to be connected to an adjacent board. Has been established.

On the other hand, the circuit breaker 12 of the circuit breaker room 20 is housed in a drawer unit 13 so as to be able to be pulled out, and the movable side main circuit disconnecting terminal 11 on the upper side of the circuit breaker 12 projects upward and one row each in the left and right direction in the depth direction. The first to third phases are provided respectively, and the fixed-side main circuit disconnecting portion terminal 14 of the drawer unit 13 is a handle at the center of the front of the lifting / lowering operation device 15 which is provided in the drawer unit 13 below the circuit breaker 12 and whose details are omitted. The circuit breaker 12 is moved up and down via a base (not shown) provided at the lower end of the circuit breaker 12 by the insertion and rotation of a handle (not shown) into the insertion hole, so that the circuit breaker 12 is vertically connected / disconnected. In FIG. 1, when the circuit breaker 12 is raised, it is in the connection position, and when it is lowered, it is in the disconnection position.

Further, the drawer unit 13 is provided with lead terminals 22A and 22B on the left and right sides for connection to the board-side conductor.
In FIG. 1, the left lead terminal 22A is on the power supply side, and the right lead terminal 22B is on the load side. The respective phases of these lead terminals 22A and 22B are arranged as the first to third phases in the depth direction similarly to the common bus 5. In addition, this outlet terminal 22A,
22B may be configured integrally with the fixed-side main circuit disconnecting section terminal 14.

Further, a through-type current transformer 30 is mounted on the outlet terminal 22B. Note that, depending on the protection method, the through-type current transformer 30 may be mounted on the power supply side outlet terminal 22A. The power supply side lead terminal 22A is connected to the same phase of the common bus 5 by a substantially linear vertical bus 25A.

On the other hand, the outlet terminal 22B is configured to extend almost linearly as it is to the cable connection terminal 32 of the cable room 23B on the right side.

In the multi-stage closed switchboard according to the first aspect of the present invention, the outlet terminals 22A and 22B of the drawer unit 13 are arranged on both left and right sides, and the vertical bus 25A connecting between the drawer units 13 and the load Since the potential is the same as that of the lead terminal portion 22B on the side, an insulating distance when connecting to the cable 7 is unnecessary, and the depth dimension of the box can be reduced. In addition, the cable connection terminal 32 for connecting the cable 7 to the load terminal 22B on the load side only needs to be disposed almost laterally from the terminal 22B, and does not bend three-dimensionally as in the conventional case. It is possible to provide a multi-stage closed switchboard which is easy to assemble. In addition, since the current transformer 30 on the side surface is not protruded from the cable room 23B, the cable connection work becomes easy, and the width of the cable room 23B can be reduced.

In the above embodiment, the power supply side is described as the left side and the load side is described as the right side.
The number of storages may be four or five. Further, the current transformer 30 may be cast-molded integrally with the outlet terminal 22B.

3 to 5 are front views each showing another embodiment of the multistage closed switchboard of the first invention. 3 shows the drawer unit 13 in the middle stage of the unit panel, and the main circuit auxiliary equipment 35 such as an instrument transformer and lightning arrester above and below it.
In which auxiliary equipment units 36 and 38 equipped with are mounted. Thus, in the case of the auxiliary device units 36 and 38, the outlet terminals 22A and 22B need only be on the power supply side. The outlet terminals 22A and 22B on the power supply side have a structure that can be selectively attached to either the right or the left. For example, the uppermost auxiliary device unit 36 has the outlet terminal 22B on the right side, and the lowermost auxiliary device unit 38 has the outlet terminal 22A on the left side. The auxiliary circuit units 36 and 38, the drawer unit 13 and the common bus 5 are connected by vertical buses 25A and 25B to form a main circuit.

When only the auxiliary device 35 is stored in the unit panel, as shown in FIG. 4, outlet terminals 22A and 22B are provided on both left and right sides of the auxiliary device unit 42, and the auxiliary device unit 4
The connection conductor 45 is connected inside 2. In the example of FIG. 4, the connection conductor 45 is provided inside the auxiliary device unit 42 at the middle stage, but the same configuration can be made at any stage. As a result, the connection between the other equipment units or the bus can be made on the left or right, and the side having the connection space and the side having good workability can be selected.

FIG. 5 shows a case where only the circuit breaker 12 is of a horizontal draw-out type. Since the auxiliary device 50 on the power supply side must always be connected during operation, there is almost no case where the auxiliary device 50 is placed in the disconnection position. The auxiliary device 50 at the upper and lower ends is provided with main circuit disconnecting terminals 54 and 55 on the back side. However, the positions of the outlet terminals 56 and 57 of the auxiliary device units 52 and 53 are arranged so as to be the same as those of the drawer unit 13. Then, the connection terminals 56 and 57 and the main circuit disconnecting terminals 54 and 55 are connected inside the auxiliary device units 52 and 53. As a result, the busbars and conductors on the panel side remain unchanged, and
Can be omitted.

FIG. 6 is a layout view of the multi-stage closed switchboard according to the second invention as viewed from the front with a front door opened, and FIG. 7 is a sectional view taken along the line BB of FIG.

In FIGS. 6 and 7, a horizontal bus 55 in which conductors of each phase are arranged in the depth direction for connection to an adjacent board is provided in the bus bar chamber 51 at the upper end in the left-right direction as viewed from the front. Circuit breaker 12 in which movable side main circuit disconnecting section terminal 11 is arranged in the upper direction,
It is stored in drawer units 13, 53 provided on the left, right, up and down. Fixed side main circuit disconnecting section terminal 1 of these drawer units 13 and 53
Reference numeral 4 denotes a lift of the circuit breaker main body by the same lifting / lowering operation device 15 as in the first invention, which is connected / disconnected in the vertical direction to the movable main circuit disconnecting section terminal 11 of the circuit breaker main body.

On the right side of the drawer unit 53, lead terminals 22A, 22B for connection to the board conductor are provided, and on the side surface of the drawer unit 13, the lead terminals 22A, 22B are also provided so as to be different from the drawer unit 53 from side to side. Provide. The drawer unit 53 and the drawer unit 13 are stacked in a plurality of stages. A vertical bus bar 25A is provided between the stacked drawer unit groups 24A and 24B with a predetermined gap between the drawer units 24A and 24B, and the drawer unit groups 24A and 24B are arranged at a base 26 disposed at the center of the lower end in the width direction of the board. On top. The base 26 may be provided separately for the drawer unit groups 24A and 24B, but the number of parts can be reduced and the level can be easily set.Also, all equipment units can be placed on the base 26 and loaded from the ceiling of the panel. Considering what is possible, it is better to make them common. Outside the two rows of drawer units 24A and 24B,
The cable rooms 23A and 23B are arranged. Left drawer unit group 2
The right lead terminal 22A of 4A and the left lead terminal 22A of the equipment unit group 24B in the right row are connected to the same phase of the common bus 55 by a substantially straight vertical bus 25A.

On the other hand, the lead terminal 2 on the left side of the drawer unit group 24A in the left row
2B is the cable connection terminal 32 of the cable room 23A on the left.
The right outlet terminal 22B of the drawer unit group 24B in the right row
Is configured to extend almost linearly as it is to the cable connection terminal 32 of the cable room 23 on the right side.

In the multi-stage closed switchboard according to the second aspect of the present invention configured as described above, the draw-out units 13 having the outlet terminals 22A and 22B arranged on the side face are stacked in multiple stages, and the draw-out units 13 are arranged in two rows. Since there is no need to provide only one vertical bus bar common to the equipment unit group, it is possible to provide a multi-stage closed switchboard with a reduced number of parts, easy assembly, and a good use of the installation area. In addition, the common vertical bus 25A can be inspected from the front without removing the circuit breaker 12.

FIG. 8 shows another embodiment of the closed switchboard of the second invention. In the figure, the drawer unit 1 is
3, 53 and auxiliary equipment units 41, 42 equipped with main circuit auxiliary equipment 40 such as an instrument transformer and a lightning arrester. In the case of auxiliary equipment units 41 and 42, outlet terminal 22A
Since only one side is required, the structure is such that it can be selectively attached to either the left or right of the fixed-side main circuit disconnecting terminal 14 and the outlet terminal 22B. For example, the lead terminal 22A of the auxiliary device unit 41 of the left device unit group 46A is only on the right side, and the lead terminal 22A of the auxiliary device unit 42 of the right device unit group 46B.
Is provided only on the left side. Then, these device unit groups are connected to a horizontal bus 55 by a common vertical bus 25A to form a main circuit.

9 is a front view of the multi-stage closed switchboard of the third invention, FIG. 10 is a sectional view taken along line CC of FIG. 9, and FIG. 11 is a sectional view taken along line DD of FIG.

9 to 11, both side surfaces and the ceiling side of the drawer unit 13 are closed by metal plates 16A, 16B and 18. However, lead terminals 22A and 22B for connection with the board-side conductor are provided at the upper part of the side surface via an insulating bushing 19 attached to the metal plates 16A and 16B. The insulating bushing 19 is of a three-phase integral type, but may be of a single-phase type. A plurality of the drawer units 13 are stacked on the base 31. At the upper end of the cable room 23B, a metal plate 29 is mounted horizontally at a position substantially at the same height as the ceiling surface of the uppermost drawer unit 13. On the other hand, the left lead terminal 22A is connected to the horizontal bus 5 by the vertical bus 24. The horizontal bus 5 is supported by an insulator 28 attached to a metal plate 18 that closes the ceiling of the drawer unit 13. Lead terminal 22A and vertical bus 2
As shown in Fig. 11, the connection of 4
The work hole 26 is provided in a part of 6A. This part is closed after the work with another closing plate 27 from the inside.

As a result, the cable room 23B on the right side of the drawer unit 13
Will be a cable compartment of 3.102.1 metal clad switchgear of Japan Electrical Manufacturers' Association Standard JEM1425.
The right outlet terminal 22B is configured to extend almost straight to the cable connection terminal 32 as in the first and second inventions.

With the above configuration, the metal plate on the left side of the drawer unit 13
Bus room surrounded by 16A, ceiling metal 18 and horizontal metal plate 29
21 becomes the busbar compartment of 3.102.1 of JEM1425 and is completely separated from the cable compartment on the right side.

In the multi-stage closed switchboard configured as described above, the boundary surface between the drawer unit 13 and the busbar room 21 and the cable room 23B is formed by a metal plate.
16A and 16B, bushings 19 are provided at the side of the lead-out terminal, and the horizontal bus 5 and the cable 7 are separated by a horizontal metal plate 29 at the ceiling of the drawer unit. Compartments separated
JEM1425 3.102.1 “Metal clad type” can be a highly safe multi-stage closed switchboard. Further, since the support of the horizontal bus 5 can be attached using the metal plate 18 on the ceiling of the equipment unit, the number of parts can be reduced.
If an insulating plate is used instead of a metal plate, JEM1425
Section 3.102.2, “Compartment-type” multi-stage closed switchboard can also be used. Further, the fixed-side main circuit disconnecting portion terminal and the lead terminal may be integrally formed.

Further, the insulating bushing 19 is not limited to a cylindrical shape, and may be a plate shape. In the case of a main circuit auxiliary device such as a transformer for an instrument or a lightning arrester, a lead-out terminal may be provided only on the power supply side, and a blocking plate may be separately attached to a bushing penetrating portion on the opposite side.

FIG. 12 and FIG. 13 show another embodiment of the multistage closed switchboard according to the third invention.

Among them, FIG. 12 shows that a horizontal metal partition plate 13a is provided inside the drawer unit 13, and a bushing 19 is attached thereto.
A vertical metal partition 43 is inserted between the bushings 19 to separate the power supply side and the load side into a “metal clad type” structure. FIG. 13 shows a "metal clad type" structure in which an L-shaped bushing 44 is used and arranged in a right and left manner.

[Effects of the Invention] As described above, according to the first invention, a bus partition that is vertically provided on one of the left and right sides of the box body and forms a bus chamber for storing a vertical bus outside one side, and a vertical bus bar on the other side of the bus partition A cable partition that separates the inner equipment room from the outer cable room, and is stored in the equipment room in multiple stages and is individually driven up and down by the lifting mechanism, and movable main circuit terminals are set up at one end on the upper side and the other side. A lead conductor that is connected to the movable main circuit terminal of the main circuit device that is penetrated by the bus partition and the cable partition, one end of which is connected to the cable of the cable room and the vertical bus, and the lower end of which is raised by the lifting mechanism. According to the second aspect of the present invention, a pair of busbar partitions is provided vertically in the center of the box body to form a busbar chamber for storing a vertical busbar therein, and the left and right sides of the busbar partition Equipment room inside and outside A cable partition that divides the cable room, a main circuit device that is housed in multiple stages in the equipment room, is individually driven up and down by a lifting mechanism, and has movable main circuit terminals on one side and the other side on the upper side, and a busbar partition And a lead conductor connected to the movable main circuit terminal of the main circuit device, one end of which is connected to the cable in the cable room and the vertical bus bar, and the lower end of which is connected to the movable main circuit terminal. According to the third aspect of the present invention, an L-shaped busbar partition is provided on the left and right and upper part of the inside of the box body and forms a bus chamber for storing a vertical busbar and an upper horizontal busbar on one side outside, and a vertical busbar partition on the other side of the busbar partition. A cable partition that separates the inner equipment room and the outer cable room from each other, and is housed in multiple stages in the equipment room and individually driven up and down by the lifting mechanism, and movable main circuit terminals are set up on one side and the other side on the upper side Main circuit machine And a lead-out conductor penetrating through the bus partition and the cable partition, one end of which is connected to the cable in the cable room and the vertical bus, and the lower end of which is connected to the movable main circuit terminal of the main circuit device which rises by the lifting mechanism. Thus, it is possible to obtain a multi-stage closed switchboard which is easy to assemble and can reduce the installation floor area.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a multistage closed switchboard according to the first invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIGS. FIG. 6 is a front view showing another embodiment of the multi-stage closed switchboard of the second invention, FIG. 6 is a front view showing one embodiment of the multi-stage closed switchboard of the second invention, and FIG. 7 is BB of FIG.
FIG. 8 is a front view showing another embodiment of the multistage closed switchboard of the second invention, FIG. 9 is a front view showing one embodiment of the multistage closed switchboard of the third invention, FIG. The figure shows C- in FIG.
FIG. 11 is a sectional view taken along line DD of FIG. 9, FIG.
FIG. 13 is a partial side view showing another embodiment of the multistage closed switchboard according to the third invention, FIG. 14 is a front view of the conventional multistage closed switchboard, and FIG. FIG. 16 is a front view of a conventional multistage closed switchboard different from FIG. 5, 55 common bus, 7 cable, 11 movable main circuit disconnecting terminal, 12 breaker, 13 drawer unit, 14
…… Fixed side main circuit disconnecting terminal, 15 …… Elevating device, 20 ……
Circuit breaker room, 21 Bus line room, 22A, 22B ... Exit terminal, 23
A, 23B …… Cable room, 24A, 24B …… Drawer unit group, 25
A, 25B …… Vertical bus.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02B 11/18 H02B 1/20

Claims (3)

(57) [Claims] 1. A busbar partition vertically provided on one of the left and right sides of a box body and forming a busbar chamber for storing a vertical busbar on one side outside, an inner equipment room vertically provided on the other side of the busbar partition, and an outer cable. A cable partition for partitioning a room, a main circuit device which is housed in the device room in upper and lower tiers and is individually driven up and down by a lifting mechanism, and a movable main circuit terminal is erected on one side and the other side on the upper side, and the bus bar A partition and a lead-out conductor connected to a movable main circuit terminal of the main circuit device, one end of which is connected to the cable of the cable chamber and the vertical bus bar, and the lower end of which is connected to the movable main circuit terminal which rises by the elevating mechanism. Multi-stage closed switchboard. 2. A pair of busbar partitions vertically formed in a central portion of the inside of the box and forming a bus chamber for storing a vertical bus therein, and an inner equipment room and an outer cable vertically provided on both left and right sides of the bus partition. A cable partition for partitioning a room, a main circuit device which is housed in the device room in upper and lower tiers and is individually driven up and down by a lifting mechanism, and a movable main circuit terminal is erected on one side and the other side on the upper side, and the bus bar A partition and a lead-out conductor connected to a movable main circuit terminal of the main circuit device, one end of which is connected to the cable of the cable chamber and the vertical bus bar, and the lower end of which is connected to the movable main circuit terminal which rises by the elevating mechanism. Multi-stage closed switchboard. 3. An L-shaped busbar partition, which is provided on the left, right and upper part of the inside of the box and forms a bus chamber for accommodating an outer vertical busbar on one side and an upper horizontal busbar, and is vertically provided on the other side of the busbar partition. A cable partition for partitioning the inner device room and the outer cable room, and a movable main circuit terminal is erected on one side and the other side on the upper side on one side and on the other side, which are stored in the upper and lower tiers and individually driven up and down by a lifting mechanism. Connected to the movable main circuit terminal of the main circuit device, which is penetrated through the bus partition and the cable partition, one side is connected to the cable in the cable room and the vertical bus, and the lower end is raised by the lifting mechanism. Multi-stage closed switchboard with lead conductors.