JP7113743B2 - Enclosed switchboard - Google Patents

Description

The present application relates to closed switchboards.

Due to the impact of the Fukushima Daiichi Nuclear Power Plant accident that occurred in 2011, new regulatory standards for nuclear power plants were enforced in 2013. This new regulatory standard requires multiplexing and decentralization of on-site power sources and power panels as a countermeasure against severe accidents (SA). The new regulatory standards also require countermeasures against aircraft collisions as terrorism. As a result, as backup measures to improve reliability against intentional aircraft crashes into the reactor building, etc., nuclear power plants are equipped with emergency control rooms, cooling pumps, and alternative power sources to cope with specific serious accidents. The introduction of facilities (hereinafter referred to as special facilities) was compulsory.

Since the building of the special heavy facility is buried in the ground, it is stronger than the existing building on the ground and has a higher natural frequency. For this reason, a closed switchboard installed in a special heavy facility must have higher rigidity and a higher natural frequency than before in order to prevent resonance with the building of the special heavy facility.

As a method for increasing the rigidity of a closed switchboard, a method of providing a reinforcing frame to the housing of the closed switchboard has been disclosed (see Patent Documents 1 and 2, for example).

JP-A-2-269406 JP-A-3-74116

In closed-type switchboards in which mounted equipment is fixed using a face plate or the like as a fastening member (hereafter referred to as a fastening part), the conventional method can increase the rigidity of the chassis. However, if the mounted device is simply fixed to the housing using the fastening portion with low rigidity, the fastening portion may amplify the vibration due to the vibration of an earthquake or the like. There is a problem that if the fastening portion vibrates significantly, the on-board equipment does not operate normally.

The present application was made to solve the above-mentioned problems, and in a closed type switchboard in which mounted equipment is fixed to the housing using a fastening part, even if an external force due to vibration such as an earthquake is applied, the fastening part will not vibrate. To provide a closed-type switchboard capable of suppressing the on-board equipment to operate normally.

A closed type switchboard according to the present application includes a housing, a mounted device mounted in the housing, a fastening portion that fastens the housing and the mounted device, and a reinforcing member that reinforces the fixing between the fastening portion and the housing. The fastening part is a faceplate, the reinforcing member is installed on a surface of the faceplate opposite to the surface facing the mounted device, the faceplate has a display part and an operation part, and is reinforced The member is provided at a portion of the faceplate where there is no display section or operation section .

The closed type switchboard of the present application includes a reinforcing member that reinforces the fixation between the fastening portion and the housing , the fastening portion is the faceplate, and the reinforcing member is the surface of the faceplate opposite to the surface facing the mounted device. The faceplate has a display portion and an operation portion, and the reinforcing member is provided at a portion of the faceplate that does not have the display portion and the operation portion, so that the rigidity of the fastening portion can be increased, It is possible to suppress the vibration of the fastening portion due to vibration such as an earthquake, and to allow the mounted equipment to operate normally.

1 is a perspective view showing a closed switchboard according to Embodiment 1; FIG. FIG. 11 is a front view showing a face plate of a closed switchboard according to Embodiment 2; FIG. FIG. 11 is a perspective view showing a closed switchboard according to Embodiment 3; FIG. 12 is a perspective view showing a closed switchboard according to Embodiment 4; FIG. 12 is a perspective view showing a closed switchboard according to Embodiment 5;

Hereinafter, a closed switchboard according to an embodiment for carrying out the present application will be described in detail with reference to the drawings. In each figure, the same reference numerals denote the same or corresponding parts. A closed switchboard is often provided with a plurality of on-board devices, but for the sake of simplicity, only one on-board device is shown and other parts are omitted.

Embodiment 1.
FIG. 1 is a perspective view showing a closed switchboard according to Embodiment 1. FIG. In FIG. 1, a closed switchboard 1 has a box-shaped housing 2, and a circuit breaker, which is a mounted device 4, is inserted through an opening 3 provided in the housing 2. As shown in FIG. A face plate 5 as a fastening portion is fastened to the mounted device 4 . Mounted equipment 4 is fixed to housing 2 using faceplate 5 . A reinforcing frame (not shown) or the like may be provided inside the housing 2 . The housing 2, faceplate 5, reinforcing frame, etc. are generally made of iron. Note that the circuit breaker, which is the on-board equipment 4, has an internal breaking mechanism for breaking the current path. The faceplate 5 does not have a display section, an operation section, or the like.

A flat reinforcement member 6 is provided on the outside of the faceplate 5 , that is, on the surface opposite to the surface of the faceplate facing the mounted device 4 so as to cover substantially the entire surface of the faceplate 5 . The reinforcing member 6 is made of metal such as iron, and preferably has rigidity equal to or higher than that of the face plate 5 . For example, if the faceplate 5 and the reinforcement member 6 are made of the same iron, the thickness of the reinforcement member 6 is preferably greater than or equal to the thickness of the faceplate 5 . Further, the reinforcing member 6 is fastened to the housing 2 using bolts at the positions of the bolt fixing points 7 so as to firmly fix the faceplate 5 to the housing 2 .

In the enclosed type switchboard configured in this manner, the faceplate 5, which is the fastening portion, is reinforced by the reinforcing member 6 and firmly fixed to the housing 2. Therefore, even if an external force due to vibration such as an earthquake is applied to the faceplate, the faceplate will still remain intact. vibration can be suppressed. As a result, the on-board equipment 4 can be operated normally.

On the other hand, if the faceplate is not reinforced, when an external force due to vibration such as an earthquake is applied, the vibration is amplified by the faceplate with low rigidity, and the amplified vibration propagates to the onboard equipment. As a result, malfunctions occur in electronic components, electrical joints, mechanical joints, etc. inside the on-board equipment. For example, vibrations of mounted equipment cause operation stoppages and malfunctions in the case of electronic components, disconnection in the case of electrical joints, and loosening of fastenings and the falling off of parts in the case of mechanical joints. As a result, the on-board equipment may not operate normally.

In this embodiment, the reinforcing member 6 has a flat plate shape, but may have any shape as long as it can increase the rigidity of the face plate.

Further, in the case of a conventional closed type switchboard, the faceplate 5 may have a handle or the like attached to the entire surface thereof for attaching and detaching mounted equipment. In the present embodiment, it is preferable that the protruding distance of the reinforcing member 6 from the face plate is approximately equal to or less than the protruding distance of the conventional handle. If the protruding distance of the reinforcing member 6 from the face plate is about the same as or less than the protruding distance of the conventional handle, the existing closed switchboard without the reinforcing member 6 can be used when replacing equipment in existing equipment. can be replaced by a closed switchboard in the form of

In this embodiment, metal such as iron is used as the material of the reinforcing member, but another material may be used.

Embodiment 2.
In the closed type switchboard of Embodiment 1, an example of a circuit breaker is shown as a mounted device. This circuit breaker does not have a display section and an operation section on the faceplate, and uses a flat reinforcing member covering almost the entire faceplate. The closed type switchboard of Embodiment 2 includes a switch as a mounted device. This switch has an opening/closing mechanism inside, and a face plate is provided with a display section, an operation section for the opening/closing mechanism, and the like.

FIG. 2 is a front view showing a faceplate attached to the closed switchboard according to this embodiment. 2, the face plate 5 is provided with a rating nameplate 10, a caution nameplate 11, a manual opening/closing portion 12, and an operation display portion 13 as a display portion or operation portion. The reinforcing member 6 of the present embodiment has a lattice shape and is provided at a location where the rating nameplate 10, the caution nameplate 11, the manual opening/closing portion 12, and the operation display portion 13 are absent. In other words, the reinforcing member 6 of this embodiment is provided at a position avoiding the display section and the operation section. In other words, the reinforcing member 6 has an opening, and this opening is provided at a position corresponding to the display section and the operation section. The reinforcing member 6 preferably has a stiffness equal to or higher than that of the faceplate 5 . As in the first embodiment, the reinforcing member 6 is connected to the housing 2 using bolts at the bolt fixing points 7 so as to firmly fix the faceplate 5 to the housing 2 . Furthermore, this reinforcing member 6 is also fixed to the faceplate 5 at another bolt fixing point 14 which is fixed only to the faceplate 5 .

In the closed type switchboard configured in this manner, the faceplate 5 is reinforced by the reinforcing member 6 and firmly fixed to the housing 2, as in the first embodiment, so that an external force due to vibration such as an earthquake is applied. Vibration of the faceplate can be suppressed even if As a result, the on-board equipment 4 can be operated normally.

In addition, since the reinforcing member 6 in the present embodiment is provided at a place where there is no rating nameplate 10, caution nameplate 11, manual opening/closing unit 12 and operation display unit 13, it is possible to check the model number of the installed equipment 4 and check the operation status. In addition to being able to confirm, the operation of the manual opening/closing unit 12 is also possible. Furthermore, since the reinforcing member 6 is also fixed to the face plate 5 at the position of another bolt fixing point 14 that is fixed to the face plate 5, it can be attached to and detached from the housing integrally with the face plate 5. At the same time, it can be expanded after installation of a closed switchboard without reinforcement members.

Embodiment 3.
FIG. 3 is a perspective view showing a closed switchboard according to Embodiment 3. FIG. The closed switchboard in this embodiment is fastened to a structural member of the building in which the closed switchboard is installed. In general, the building in which the closed switchboard is installed has a higher rigidity than the enclosure of the closed switchboard.

In FIG. 3, in the closed switchboard 1 of the present embodiment, a mounting device 4 is fixed to a box-shaped housing 2 using a face plate 5 . A flat reinforcing member 6 is provided outside the face plate 5 . As in the first embodiment, the reinforcing member 6 is fastened to the housing 2 using bolts at the bolt fixing points 7 so as to firmly fix the faceplate 5 to the housing 2 . Further, this reinforcing member 6 has extensions 17 for fastening to the floor 15 and walls 16 of the building outside the housing 2, using the extensions 17 to bolt the floor 15 and the walls 16 respectively. It is fixed at the position of the fixed point 18 . The extension 17 protrudes from the housing 2 of the enclosed switchboard 1 and is configured to contact the floor 15 and walls 16 of the building.

In the closed type switchboard configured in this manner, the faceplate 5 is reinforced by the reinforcing member 6 and firmly fixed to the housing 2, as in the first embodiment, so that an external force due to vibration such as an earthquake is applied. Vibration of the faceplate can be suppressed even if As a result, the on-board equipment 4 can be operated normally.

In addition, since the reinforcing member 6 in the present embodiment is also fastened to the structural member of the building in which the closed switchboard is installed, it is possible to enjoy not only the rigidity of the housing but also the high rigidity of the building. .

In addition, in the present embodiment, an example in which the reinforcing member 6 is fastened to both the floor and the wall of the building is shown, but it may be fastened to either one. Moreover, it does not necessarily have to be fastened to the structural member of the building, and other structural members may be used as long as they are structural members having higher rigidity than the enclosure of the closed type switchboard.

Embodiment 4.
FIG. 4 is a perspective view showing a closed switchboard according to Embodiment 4. FIG. In the closed type switchboard according to the present embodiment, the face plate, which is the fastening portion, is fixed to the housing inside the box-shaped housing.

In FIG. 4, in the closed switchboard 1 of the present embodiment, a mounted device 4 is fixed inside a box-shaped housing 2 using a face plate 5 as a fastening portion. One surface of the box-shaped housing 2 is an opening 3 , and the mounted device 4 is inserted into the housing 2 through this opening 3 . The mounted device 4 is fastened to the faceplate 5 and arranged on the back side of the faceplate 5 when viewed from the opening 3 . A door 20 is fastened to the opening 3 via a hinge 21 . The closed switchboard 1 is used with the door 20 closed.

A flat reinforcing member 6 is provided on the opening 3 side of the face plate 5 . The reinforcing member 6 is fixed to the faceplate 5 using bolts at bolt fixing points 22 , and is bolted at bolt fixing points 7 so as to firmly fix the faceplate 5 to the housing 2 . It is also fastened to the housing 2 using

In the enclosed type switchboard constructed in this manner, the faceplate 5 is reinforced by the reinforcing member 6 and firmly fixed to the housing 2, so that even if an external force due to vibration such as an earthquake is applied, the vibration of the faceplate is suppressed. can do. As a result, the on-board equipment 4 can be operated normally.

Embodiment 5.
FIG. 5 is a perspective view showing a closed switchboard according to the fifth embodiment. In the closed type switchboard according to the present embodiment, the fastening portion is configured by a door. The closed-type switchboard of this embodiment includes on-board equipment installed on the door.

5, the closed switchboard 1 of this embodiment has a box-shaped housing 2, and a door 20 is attached to an opening (not shown) provided in the housing 2. As shown in FIG. A protection relay 23, which is an on-board device, is fixed to the door 20, which is a fastening portion. This protective relay 23 monitors the state of the circuit and, in the event of an abnormality, transmits a control signal such as a circuit break.

The door 20 is fastened to the housing 2 via hinges 21 . The door 20 to which the protective relay 23 is fixed has a meter 24 for measuring and displaying current, voltage, etc., a test terminal 25 for testing, measuring and calibrating the protective relay 23, and a lamp indicating the open/close state of the circuit breaker. 26 and a switch 27 for switching the circuit. The reinforcing member 6 of the present embodiment is H-shaped, and is provided at a location where the meter 24, the test terminal 25, the lamp 26, the switch 27, and the like are not provided with a display section and an operation section. In other words, the reinforcing member 6 of this embodiment is provided at a position avoiding the display section and the operation section. In other words, the reinforcing member 6 has an opening, and this opening is provided at a position corresponding to the display section and the operation section. The reinforcing member 6 is fastened to the door 20 and the housing 2 using bolts at the positions of the bolt fixing points 7 so as to firmly fix the door 20 to the housing 2 . The reinforcing member 6 does not necessarily have to be H-shaped, and may be of any shape as long as it can fend off various devices attached to the door.

In the enclosed type switchboard constructed in this manner, the door 20, which is the fastening portion, is reinforced by the reinforcing member 6 and is firmly fixed to the housing 2. Therefore, even if an external force due to vibration such as an earthquake is applied, the door 20 cannot be secured. Vibration can be suppressed. As a result, the protective relay 23, which is a mounted device, can be operated normally.

Further, since the reinforcing member 6 in the present embodiment is provided at a location where there are no various devices, it is possible to confirm the operation status of the protective relay 23 and to operate the operating portion such as the switch.

In Embodiments 1 to 4, the fastening portion is a face plate, and in Embodiment 5, the fastening portion is a door. The fastening portion may be any other member as long as it is a member for doing so.

Although this application describes various exemplary embodiments, the various features, aspects, and functions described in one or more embodiments may be limited to the application of particular embodiments. can be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not illustrated are envisioned within the scope of the technology disclosed in the present application. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

1 Enclosed Switchboard 2 Enclosure 3 Opening 4 Mounted Equipment 5 Face Plate 6 Reinforcing Member 7 Bolt Fixing Point 10 Rating Nameplate 11 Caution Nameplate 12 Manual Opening/Closing Part 13 Operation Indicator 14 Volt Fixed points 15 Floor 16 Walls 17 Extensions 18 Bolt fixed points 20 Doors 21 Hinge 22 Bolt fixed points 23 Protective relays 24 Meters 25 Test terminals 26 Lamps 27 Switches.

Claims (4)

a housing;
On-board equipment installed in this housing,
a fastening portion that fastens the housing and the mounted device;
a reinforcing member that reinforces fixation between the fastening portion and the housing;
An enclosed switchboard comprising
The fastening portion is a faceplate,
The reinforcing member is installed on a surface of the faceplate opposite to the surface facing the mounted device,
The faceplate has a display unit and an operation unit,
The closed type switchboard, wherein the reinforcing member is provided at a portion of the face plate where the display portion and the operation portion are not provided. a housing;
On-board equipment installed in this housing,
a fastening portion that fastens the housing and the mounted device;
a reinforcing member that reinforces fixation between the fastening portion and the housing;
An enclosed switchboard comprising
The fastening part is a hinged door,
The closed type switchboard, wherein the reinforcing member is installed outside the door. The door has a display unit and an operation unit,
3. The closed type switchboard according to claim 2 , wherein the reinforcement member is provided at a portion of the door where the display portion and the operation portion are not provided. a housing;
On-board equipment installed in this housing,
a fastening portion that fastens the housing and the mounted device;
a reinforcing member that reinforces fixation between the fastening portion and the housing;
An enclosed switchboard comprising
The closed -type switchboard, wherein the reinforcing member has an extension portion that extends outside the housing and can be fastened to a structural member outside the housing.

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