JPWO2004107520A1 - Switchgear - Google Patents

Abstract

The switchgear is connected between the main bus and the cable for connecting to the external circuit in order to obtain a switchgear that can be easily assembled in a short time with a small number of workers, and is inexpensive and has high rigidity of the housing. A plurality of electrical devices constituting the main circuit and a housing for housing these electrical devices, the housing having an outer panel that defines the outer shape of the housing and a compartment for housing the electrical devices inside the housing. A partition wall for partitioning is provided, the electric device is attached to and supported by the partition wall, and the outer panel includes a plurality of panel portions having coupling edges at positions corresponding to the positions of the partition walls.

Description

  The present invention relates to a switchgear.

In the switchgear, the main switchgear is partitioned by a partition plate made of a ground metal or an insulator, and a plurality of compartments called closed compartments are formed inside the casing. The purpose of partitioning in this way is to protect the operator / maintenance inspector from approaching the high-voltage charging unit, from intruding foreign matter, and to limit the range of influence of a failure occurring inside the switchgear. Such compartments are commonly referred to as busbar compartments, circuit breaker compartments, load-side cable compartments, etc., depending on the equipment they house. On the other hand, in order to obtain the necessary structural strength and for the convenience of manufacturing and assembly, the casing itself has been configured such that the casing portions divided into a plurality of parts are joined together to form an outer box as the casing.
In conventional switchgear, main circuit electrical equipment such as circuit breakers, main busbars, current transformers, wiring conductors between them, and insulators that support and insulate the conductors are placed in a case closed with a grounded metal. Assembled. For this reason, the assembly work of the switchgear is difficult and time-consuming, and a large transport assist device such as an overhead crane is necessary to move heavy objects such as main circuit electrical equipment and conductors. A staff member was needed. Further, depending on the type of main circuit electrical equipment, the frame of the ceiling part of the housing may become an obstacle and the crane cannot be used. (See, for example, JP-A-9-46829).
Accordingly, an object of the present invention is to obtain a switch gear that can be easily assembled in a short time by a small number of workers, is inexpensive, and has a high rigidity of the casing.

  Therefore, according to the present invention, the switchgear includes a plurality of electrical devices constituting the main circuit connected between the main bus and a cable for connecting to an external circuit, and a housing for housing these electrical devices. The housing includes an outer surface panel that partitions the outer shape of the housing, and a partition wall that partitions the interior of the housing into a compartment that houses the electrical device. A device is directly or indirectly attached to and supported by the partition wall or the coupling portion, and the outer panel includes a plurality of panel portions having coupling edges at positions corresponding to the positions of the partition walls.

FIG. 1 is a schematic sectional side view showing a switchgear according to the present invention.
FIG. 2 is an exploded perspective view showing the casing of the switchgear according to the present invention.
FIG. 3 is a perspective view showing a circuit breaker chamber portion of the switchgear housing of the present invention.
FIG. 4 is a perspective view showing a state in which the main bus chamber is coupled to the circuit breaker chamber of FIG.
FIG. 5 is a perspective view showing a state in which a partition wall and a branch conductor are coupled to the main bus chamber of FIG.
FIG. 6 is a perspective view showing a state in which a cable room is coupled to the main bus room of FIG.

FIG. 1 is a schematic sectional side view of a switchgear according to the present invention, and FIG. 2 is a schematic perspective view of a casing 1 of the switchgear. The switch gear includes a substantially rectangular parallelepiped housing 1, and a plurality of electrical components constituting a switch gear such as a circuit breaker 2, a control device 3, a main bus 4, a current transformer 56, and a cable 5 are provided inside the housing 1. Equipment is stored. The housing 1 is provided with an outer panel 6 that constitutes an outer box that forms a substantially rectangular parallelepiped outer shape of the housing 1. The outer panel 6 includes a front panel 7, a rear panel 8, a top panel 9, and a bottom panel. It consists of 10 and two side panels 11. The housing 1 is also provided with various partition walls 12, and the interior of the housing 1 is divided into a plurality of compartments such as a circuit breaker chamber 13, a controller chamber 14, a main bus chamber 15, and a cable chamber 16. A plurality of electric devices such as the circuit breaker 2, the control device 3, the main bus 4, the cable 5 and the like are separately housed.
In the housing 1 shown in FIGS. 1 to 6, the circuit breaker chamber 13 includes a rectangular bottom wall panel portion 18 and two rectangular side wall panel portions 19 rising from the side edges of the bottom wall panel portion 18. The top wall panel portion 20 that connects the top portions of the front portion of the side wall panel portion 19 to each other and the rear wall panel portion 21 are defined. The front surface of the circuit breaker chamber 13 is closed by a front wall panel portion 22 which is a front opening / closing door. Each of these various panel portions described later has a bent portion in which at least one edge of the steel plate is bent at a substantially right angle with respect to the main surface of the panel portion. The portion is a connecting edge 17 between the panel portion and the partition wall, which will be described in detail later.
On the top wall panel portion 20 of the circuit breaker chamber 13, there is a bottom wall panel portion 23, a side wall panel portion 24, a top wall panel portion 25 and a rear wall panel portion 26. A controller room 14 is provided which is closed by a panel portion 26a.
In this description, the controller room 14 is described as being provided on the circuit breaker room 13 at this stage. However, the controller room 14 may be used at other timings, for example, after the main bus room 15 is coupled to the circuit breaker room 13 or at the same time. Further, the cable chamber 16 may be coupled at a stage after the cable chamber 16 is coupled.
A main bus room 15 is arranged and coupled behind the circuit breaker room 13 and the controller room 14 combined in this way. The main bus chamber 15 includes two key-shaped side wall panel portions 27 parallel to each other, and a front wall panel portion 28 provided between the side wall panel portions 27 so as to recede from the front edge of the side wall panel portion 27, A rear wall panel portion 29, a top wall panel portion 31 having two flappers 30, and a bottom wall panel portion 32 are arranged and joined. The bottom wall panel portion 32 is provided so as to recede upward from the lower edge 34 of the side wall panel portion 27, and the rear wall panel portion 29 closes between the top wall panel portion 31 and the bottom wall panel portion 32. . The side wall panel portion 27 is provided with an opening 33 for allowing the main bus bar 4 to pass therethrough.
The side wall panel portion 27 of the main bus chamber 15 is joined to the side edge 35 of the bottom wall panel portion 18 of the circuit breaker chamber 13 at the lower edge 34 of the rear portion thereof by a suitable coupling means 40 such as rivets, screws, welding, adhesives and the like. The lower edge 37 and the lower edge 37 of the lower part are connected to the rear edge 38 and the upper edge 39 of the side wall panel portion 19 of the circuit breaker chamber 13, respectively.
A cable chamber 16 is disposed behind the main bus chamber 15 and coupled thereto. The cable chamber 16 is formed by two parallel side wall panel portions 42, a top wall panel portion 44 having a flapper 43 and a bottom wall panel portion 46 having an opening 45. The front surface of the cable chamber 16 is open. A front edge 47 of the side wall panel portion 42 is coupled to a rear edge 48 of the side wall panel portion 27 of the main bus bar chamber 15.
In such a configuration, the circuit breaker room 13, the controller room 14, the main bus room 15 and the cable room 16 which are a plurality of compartments are respectively a front wall panel part, a rear wall panel part, a top wall panel part, It can be said that it is divided by the bottom wall panel part and the both-side wall panel part.
In addition, the front wall panel portion, the rear wall panel portion, the top wall panel portion, the bottom wall panel portion, and the both side wall panel portions of the plurality of compartments are combined in combination with each other as appropriate. It can be said that the rear panel 8, the top panel 9, the bottom panel 10, and the two side panels 11 are configured.
Further, in a portion where the wall panel portions of the circuit breaker chamber 13, the controller chamber 14, the main bus chamber 15 and the cable chamber 16, which are a plurality of compartments, are adjacent to each other, one of the wall panel portions is overlapped. It can also be said that the other wall panel portion remaining is a common single partition wall 12 between the compartments. For example, in the relationship between the circuit breaker chamber 13 and the main bus chamber 15 disposed behind the circuit breaker chamber 13, when they are assembled, the rear wall panel portion 21 of the circuit breaker chamber 13 is the same as the front wall panel portion of the main bus chamber 15. It is a common single partition wall 12 that also functions as a part.
Further, the outer surface panel 6 forming the outer shape of the housing 1 is connected to the coupling edge 17 (for example, the lower edge 34, the front edge 36, and the side edge panel portion 27 of the main busbar chamber 15) at a position corresponding to the position of the partition wall 12. The partition wall 12 is divided into a plurality of panel parts having a lower edge 37 and a side edge 35, a rear edge 38 and an upper edge 39) of the bottom wall panel part 18 of the circuit breaker chamber 13, and the partition wall 12 is connected to the edge 17 of the panel part. Is bound to.
In the housing 1 configured in this way, as shown in FIG. 1, branch conductors 51 are connected to three parallel main buses 4 introduced into the housing 1. The branch conductor 51 is supported by an insulator 53 on a mounting frame 52 supported by a rear wall panel portion 29 that is a partition wall 12 between the main bus chamber 15 and the cable chamber 16, and extends downward. The attachment frame 52 can also be attached to the joint 48 of the side wall panel portion 27. The lower end of the branch conductor 51 is connected between the main bus chamber 15 and the circuit breaker chamber 13 to the end on the main bus chamber 15 side of the first bushing 54 attached to the rear wall panel portion 21. The rear wall panel portion 21 is also provided with a second bushing 55 between the main bus chamber 15 and the cable chamber 16. The breaker 2 disposed in the breaker chamber 13 is connected to the first and second bushings 54 and 55 so as to be able to be pulled out. A branch conductor 57 connected to the current transformer 56 is connected to the end of the second bushing 55 on the cable chamber 16 side, and the other end of the branch conductor 57 is a cable 5 for connecting to an external circuit. Is connected. The current transformer 56 is provided on the rear wall panel portion 29 of the main bus chamber 15 and supported by a mounting plate 56 a that increases the rigidity of the rear wall panel portion 29.
The switchgear housing thus configured is configured by combining a plurality of panel portions into which the housing is divided, and a partition wall for forming a compartment is provided at the connection portion. is there. The partition wall can be attached together with a partition plate, for example, with a common screw or the like, to the joint portion of the housing, or one of the joint portions of the housing extends toward the inside of the housing and serves as an extension portion. The partition plate can be attached and supported, or the coupling portion of the housing can be extended in the width direction and closed to form the partition plate.
According to this invention, the housing of the switchgear is divided into a plurality of parts, and the partition wall of the compartment is connected to the connection part between the compartment that houses the circuit breaker, the main busbar, etc., and the compartment that divides the load-side cable chamber. In addition, equipment mounting plates such as main buses, current transformers, and insulator mounting frames for insulating and supporting the branch conductors are attached. For this reason, the rigidity of the housing is increased, and the strength is high against an increase in internal pressure at the time of an internal failure, so that the thickness of the panel can be reduced.
As well shown in FIG. 1 and FIGS. 3 to 5, most of the electric devices constituting the main circuit of the switchgear of the present invention are attached to and supported by the partition wall 12 that defines the main busbar chamber 15. Has been. That is, the branch conductor 51 connected to the main bus 4 is supported by the rear wall 29 of the main bus chamber 15 via the insulator 53 and the mounting frame 52, and the first and second bushings 54 and 55 are connected to the circuit breaker chamber 13. The branch conductor 57 and the current transformer 56 are supported on the rear wall 29 of the main bus bar 15 by a mounting plate 56a.
Therefore, when assembling the switchgear, as described above, the main bus chamber 15 is combined and coupled to the circuit breaker chamber 13 of FIG. 3, and the branch conductor 51 and the bushings 54 and 55 are surrounded by the panel portion. In addition, the rear wall 29 of the main bus chamber 15 is attached with screws or the like, and the current transformer 56 and the branch conductor 57 are attached to the rear wall 29 via the attachment plate 56a. Assume the state of the busbar assembly.
That is, according to this assembling operation, in FIG. 3, the bushings 54 and 55 are first attached to the rear wall 21 of the circuit breaker chamber 13 whose periphery is relatively open, and the branch conductor 51 is connected to these bushings to attach the mounting frame. 52 and insulator 53 are also assembled in the circuit breaker chamber 13. Next, the joint edge 17 of the panel portion of the main bus bar chamber 15 is joined to the joint edge of the side wall panel portion 27 of the circuit breaker chamber 13 with screws or the like, and the branch conductor 51 and the bushings 54 and 55 are covered. It becomes. The mounting frame 52 is supported by being coupled to the coupling edge 17 of the side wall panel portion 27 with screws or the like. Next, as shown in FIG. 5, the rear wall panel portion 29 is coupled to the coupling edge 17 of the side wall panel portion 27 with screws or the like, and the branch conductor 57 is formed on the rear surface (the front surface in FIG. 5) of the rear wall panel portion 29. The current transformer 56 fixedly connected is attached via the attachment plate 56 a to connect the branch conductor 57 to the second bushing 55.
The assembly work of the circuit breaker room / main bus room assembly up to this point is an operation that does not need to be performed in a narrow enclosed space. Conversely, after the electrical equipment is installed in a wide space, the electrical equipment is enclosed by a panel. As a result, it is easy to assemble the electric device, and the heavy electric device can effectively use the transport assisting device, and the working time can be shortened. In addition, since the electrical device such as the current transformer mounting frame is supported by the rear wall panel portion 29 that is the partition wall of the main bus chamber 15, the rigidity of the housing is increased.
As shown in FIG. 6, the cable chamber 16 is further coupled to the breaker chamber / main bus chamber assembly of FIG. 5 to cover the branch conductor 57 and the current transformer 56, and the controller chamber 14 (FIG. 2) is coupled. A switchgear as shown in FIG. 1 can be obtained by wiring between various electrical devices.
As described above, according to the present invention, in the switchgear, the electric device constituting the main circuit is supported by being attached to the partition wall that divides the interior of the housing into compartments, and the panel portion of the housing is supported by the partition wall. It is coupled at a position corresponding to the position, and can be easily assembled in a short time by a small number of workers, and a switch gear with high rigidity of the housing can be obtained at a low cost.

Claims (3)

In a switchgear comprising a plurality of electric devices constituting a main circuit connected between a main bus and a cable for connecting to an external circuit, and a housing for storing these electric devices,
The housing includes an outer surface panel that partitions the outer shape of the housing, and a partition wall that partitions the interior of the housing into a compartment that houses the electrical device,
The electrical device is attached to and supported by the partition wall,
The switchgear, wherein the outer panel includes a plurality of panel portions having coupling edges at positions corresponding to the positions of the partition walls. The electrical device includes a circuit breaker, first and second bushings that can contact and separate from the circuit breaker, and a first branch that can be connected to the first bushing at one end and to the main bus at the other end. A conductor, a second branch conductor that can be connected to the second bushing at one end and to the cable at the other end, and a current transformer provided in the second branch conductor,
2. The switchgear according to claim 1, wherein the first and second bushings, the first branch conductor, and the current transformer are directly attached to and supported by the partition wall. The housing is divided into a compartment for storing a circuit breaker, a main busbar, and the like, and a compartment for partitioning a cable chamber on the load side, and a partition wall of the compartment, a main busbar, a current transformer, etc. The switchgear according to claim 1, wherein the device mounting plate and an insulator mounting frame for insulatingly supporting the branch conductor are attached.

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