Switchgear
The switchgear's compartmentalized design with separate access doors for circuit breakers and cables addresses maintenance safety and structural complexity issues, ensuring safer operations and easier maintenance.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- NISSIN ELECTRIC CO LTD
- Filing Date
- 2024-11-29
- Publication Date
- 2026-06-10
AI Technical Summary
Existing switchgears face issues with mixed access directions during maintenance, leading to potential accidental access to charged circuits and a complex partition structure.
The switchgear is designed with a housing that separates circuit breakers and cables into distinct compartments, with the first circuit breaker on the front and second on the rear, and includes doors on both sides for safe maintenance, simplifying the partition structure.
This design allows for safer maintenance by preventing accidental access to energized circuits and simplifies the compartment layout, enhancing operational safety and convenience.
Smart Images
Figure 2026094936000001_ABST
Abstract
Description
Technical Field
[0004]
[0001] The present disclosure relates to a switchgear.
Background Art
[0002] There is known a switchgear that houses two circuit breakers and the circuits connected to the respective circuit breakers. The cable chamber and the busbar chamber of each circuit are partitioned by partition plates, and consideration is given to safety.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] However, when the access directions during maintenance are the same in the two circuits, the power-off locations of the circuit to be worked on and the charged locations of the other circuit without problems are mixed when viewed from the access direction. Therefore, there is a possibility that an operator may accidentally access the charged location of the other circuit without problems. In addition, since the access directions to the two circuits are the same, there is also a problem that the partition structure becomes complicated.
[0005] An object of the present disclosure is to realize a switchgear that can be maintained more safely and has a simple partition structure.
Means for Solving the Problems
[0006] To solve the above problems, the present invention provides a first circuit breaker, a second circuit breaker, a busbar connected to one end of the first and second circuit breakers via a conductor, a first cable connected to the other end of the first circuit breaker, a second cable connected to the other end of the second circuit breaker, and a housing, wherein the first circuit breaker is located on the front side inside the housing, and the second circuit breaker is located on the rear side inside the housing, and the inside of the housing is divided by a plurality of plates into a busbar room for housing the busbar, a first circuit breaker room for housing the first circuit breaker, a second circuit breaker room for housing the second circuit breaker, a first cable room for housing the first cable, and a second cable room for housing the second cable, wherein the first circuit breaker room and the first cable room are located on the front side of the housing, and the second circuit breaker room and the second cable room are located on the rear side of the housing, and the housing has doors on the front and rear sides. [Effects of the Invention]
[0007] According to one aspect of this disclosure, a switchgear can be realized that allows for safer maintenance and has a simpler compartment structure. [Brief explanation of the drawing]
[0008] [Figure 1] This is a transparent view of a switchgear as seen from the side, according to one embodiment of the present disclosure. [Figure 2] Figure 1 is a transparent side view of the switchgear, showing the section of the switchgear shown. [Figure 3] Figure 1 is an explanatory diagram showing the assembly of the switchgear. [Figure 4] This figure shows the arrangement of each part when the busbar arrangement in the switchgear shown in Figure 1 is the same on the front and rear sides. [Figure 5] This diagram shows the arrangement of each part when the busbar arrangement in the switchgear shown in Figure 1 is reversed on the front and rear sides. [Figure 6] This is a side view of a switchgear, showing a section of the switchgear in another embodiment of the present disclosure. [Modes for carrying out the invention]
[0009] [Embodiment 1] Hereinafter, one embodiment of this disclosure will be described in detail with reference to Figures 1 to 5.
[0010] <Outline of Switchgear 100 Configuration> Figure 1 is a side view of the switchgear 100 related to this disclosure. The switchgear 100 is also referred to as power receiving and distribution equipment or a cubicle.
[0011] As shown in Figure 1, the switchgear 100 has an external shape that is nearly square when viewed from the side, and a rectangle that is longer in the vertical direction than in the horizontal direction when viewed from the front-to-back direction (see Figures #401 and #402 in Figure 4). The switchgear 100 has a front door 511 on the front 101 and a rear door 521 on the rear 102. A roof 112 is positioned on the top surface of the switchgear 100. The width direction of the switchgear 100 is synonymous with the left-to-right direction. The left-to-right orientation is defined by the orientation when an operator stands on the front 101 or rear 102 of the switchgear 100 and faces the switchgear 100 directly.
[0012] The switchgear 100 comprises a first circuit breaker 11, a second circuit breaker 41, a first cable 12, a second cable 42, a busbar 30, a housing 50, and a plurality of partition plates (plate materials) 60 that divide the inside of the housing 50.
[0013] The housing 50 houses the various parts of the switchgear 100. In other words, the first circuit breaker 11, the second circuit breaker 41, the first cable 12, the second cable 42, the busbar 30, and the multiple partition plates 60 are housed inside the housing 50. The front door 511 and the rear door 521 are provided on the housing 50.
[0014] In this embodiment, the housing 50 is provided so as to be separable in the front-rear direction, and is divided into a front housing 51 located on the front side and a rear housing 52 located on the rear side 102.
[0015] The bus bar 30 is a three-phase three-wire type and is arranged across the width direction of the switchgear 100. When the switchgear 100 is arranged side by side such that its left and right side faces contact those of other switchgears, the bus bar 30 is connected to the bus bars of other switchgears at the left and right side faces of the switchgear 100. The bus bar 30 is connected to one end side of each of the first circuit breaker 11 and the second circuit breaker 41 via a conductor 31.
[0016] The first circuit breaker 11 is a circuit breaker that opens and closes the first circuit, and the second circuit breaker 41 is a circuit breaker that opens and closes the second circuit. The first circuit and the second circuit are each three-phase circuits. Examples of the first circuit breaker 11 and the second circuit breaker 41 include vacuum circuit breakers.
[0017] The first circuit breaker 11 is arranged on the front surface 101 side inside the housing 50, and the second circuit breaker 41 is arranged on the rear surface 102 side inside the housing 50. More specifically, the first circuit breaker 11 is arranged inside the front housing 51 and on the side of the front door 511 which is the door of the front housing 51. The second circuit breaker 41 is arranged inside the rear housing 52 and on the side of the rear door 521 which is the door of the rear housing 52.
[0018] The bus bar 30 and one end sides of the first circuit breaker 11 and the second circuit breaker 41 are connected using three-phase conductors 31. A first cable 12 is connected to the other end side of the first circuit breaker 11, and a second cable 42 is connected to the other end side of the second circuit breaker 41.
[0019] In this embodiment, the first cable 12 and the second cable 42 are located on the sides of the first circuit breaker 11 and the second circuit breaker 41. The first cable 12 and the second cable 42 are drawn out from the first circuit breaker 11 and the second circuit breaker 41 and are connected to three-phase conductors 32 on the sides of the first circuit breaker 11 and the second circuit breaker 41 (see the reference numerals #401 and #402 in FIG. 4). The first cable 12 and the second cable 42 are bundled together midway and drawn out from the bottom surface of the housing 50 and connected to external equipment.
[0020] The first circuit breaker 11, the first cable 12, and the bus bar 30 are housed in the front housing 51 and unitized to form the first unit 110. Similarly, the second circuit breaker 41 and the second cable 42 are housed in the rear housing 52 and unitized to form the second unit 111.
[0021] The plurality of partition plates 60 include a plate material 60-1 (indicated by a thick line) that partitions the interior of the housing 50 and a structural wall 60-2 (indicated by a thick dotted line) that is part of the first circuit breaker 11 and the second circuit breaker 41. The partition plate 60 is preferably removable.
[0022] <Compartment of the switch gear 100> FIG. 2 is a transparent view of the switch gear 100 showing the compartment of the switch gear 100 as seen from the side. Here, the compartment (compartment) of the switch gear 100 will be described using FIG. 2.
[0023] As shown in FIG. 2, the interior of the housing 50 is partitioned by a plurality of partition plates 60 into a bus bar chamber CP1 that houses the bus bar 30, a first circuit breaker chamber CP2 that houses the first circuit breaker 11, a second circuit breaker chamber CP3 that houses the second circuit breaker 41, a first cable chamber CP4 that houses the first cable 12, and a second cable chamber CP5 that houses the second cable 42.
[0024] The first circuit breaker chamber CP2 and the first cable chamber CP4 are located on the front side of the housing 50, and the second circuit breaker chamber CP3 and the second cable chamber CP5 are located on the rear surface 102 side of the housing 50. In the present embodiment, the respective back plates 512 and 522 of the front housing 51 and the rear housing 52 have the function of partition plates 60 and partition the front-rear direction of the housing 50. That is, the first cable chamber CP4 and the second cable chamber CP5 are partitioned by the respective back plates 512 and 522 of the front housing 51 and the rear housing 52.
[0025] Furthermore, the back plates 512 and 522 divide the housing 50 in the front-to-rear direction, so that the busbar room CP1 is also divided into a front busbar room CP1a located on the front side and a rear busbar room CP1b located on the rear side 102. Note that if the housing 50 is not configured to be separable and the first cable room CP4 and the second cable room CP5 are separated by a partition plate 60, it is not necessary to divide the busbar room CP1 into front and rear sections. Alternatively, the busbar 30 may be housed in the rear housing 52.
[0026] <Assembly of Switchgear 100> Figure 3 is an explanatory diagram showing the assembly of the switchgear 100. As shown in Figure 3, in this embodiment, the switchgear 100 is divided into a first unit 110 in which the first circuit breaker 11, the first cable 12 and the busbar 30 are housed in the front housing 51, and a second unit 111 in which the second circuit breaker 41 and the second cable 42 are housed in the rear housing 52.
[0027] Therefore, when installing the switchgear 100, the first unit 110 and the second unit 111 can be transported separately, and the back plates 512 and 522 of the front housing 51 and the rear housing 52 can be butted together and assembled at the installation site.
[0028] In the back plates 512 and 522, in the portion that divides the busbar room CP1 into the front busbar room CP1a and the rear busbar room CP1b, insulators 61 (see figures #401 and #402 in Figure 4) are provided to fix the conductors 31 of the busbar 30 housed in the first unit 110 (front housing 51). After assembling the first unit 110 and the second unit 111, the roof 112 is attached.
[0029] In this way, by having a first unit 110 in which the components are housed in the front housing 51 and a second unit 111 in which the components are housed in the rear housing 52, it becomes possible to transport the switchgear 100 even when it would be difficult to transport it to the installation site due to its size in its undivided state, thus providing superior convenience.
[0030] <Arrangement of the busbars> Figure 4 shows the arrangement of each part when the arrangement of the busbars 30 in the switchgear 100 is the same on the front 101 side and the rear 102 side.
[0031] In Figure 4, the diagram labeled #401 shows the arrangement of the busbar 30, the first circuit breaker 11, and the first cable 12 as viewed from the front 101 side of the switchgear 100. The diagram labeled #402 shows the arrangement of the busbar 30, the second circuit breaker 41, and the second cable 42 as viewed from the rear 102 side of the switchgear 100. The diagram labeled #403 shows the positional relationship between each conductor 31 connected to the first circuit breaker 11 and the second circuit breaker 41, and the first cable 12 and the second cable 42. The diagram labeled #404 shows the positional relationship between each conductor 32 drawn out from the first circuit breaker 11 and the second circuit breaker 41, and the first cable 12 and the second cable 42. In the diagrams labeled #401 to #404, RST is added to the labels to distinguish between the R phase / S phase / T phase of the three-phase system.
[0032] As shown in Figure 4, when the arrangement of the busbars 30 in the switchgear 100 is the same for the first unit 110 on the front 101 side and the second unit 111 on the rear side, the positional relationships of the first circuit breaker 11 and the second circuit breaker 41, and the first cable 12 and the second cable 42 are the same for the first unit 110 and the second unit 111.
[0033] Figure 5 shows the arrangement of each part when the arrangement of the busbars 30 in the switchgear 100 is reversed on the front 101 side and the rear 102 side.
[0034] In Figure 5, the diagram labeled #501 shows the arrangement of the busbar 30, the first circuit breaker 11, and the first cable 12 as viewed from the front 101 side of the switchgear 100. The diagram labeled #502 shows the arrangement of the busbar 30, the second circuit breaker 41, and the second cable 42 as viewed from the rear 102 side of the switchgear 100. The diagram labeled #503 shows the positional relationship between each conductor 31 connected to the first circuit breaker 11 and the second circuit breaker 41, and the first cable 12 and the second cable 42. The diagram labeled #504 shows the positional relationship between each conductor 32 drawn out from the first circuit breaker 11 and the second circuit breaker 41, and the first cable 12 and the second cable 42. In the diagrams labeled #501 to #504, RST is added to the labels to distinguish between the R phase, S phase, and T phase of the three-phase system.
[0035] As shown in Figure 5, if the arrangement of the busbars 30 in the switchgear 100 is reversed between the first unit 110 on the front 101 side and the second unit 111 on the rear side, the relative positions of the first circuit breaker 11 and the second circuit breaker 41, and the first cable 12 and the second cable 42 will be reversed between the first unit 110 and the second unit 111.
[0036] <Maintenance procedure for Switchgear 100> When performing maintenance on the first cable 12, the worker sets the first circuit to ground potential. At this time, the second circuit may be energized or charged. Next, the worker opens the front door 511 and removes the plate covering the first cable chamber CP4 on the front surface 101. This exposes the first circuit, including the first cable 12, allowing the worker to perform maintenance on the first cable 12.
[0037] At this time, the second cable chamber CP5 is blocked by the back plates 512 and 522 of the front enclosure 51 and the rear enclosure 52, and the second circuit is not exposed. Therefore, it is physically impossible to accidentally access the second circuit while it is energized or charged, thus reliably preventing errors by the operator.
[0038] When performing maintenance on the second cable 42, the worker sets the second circuit to ground potential. At this time, the first circuit may be energized or charged. Next, the worker opens the rear door 521 and removes the plate covering the second cable chamber CP5 on the rear surface 102. This exposes the second circuit, including the second cable 42, allowing the worker to perform maintenance on the second cable 42.
[0039] At this time, the first cable chamber CP4 is blocked by the back plates 512 and 522 of the front enclosure 51 and the rear enclosure 52, and the first circuit is not exposed. Therefore, it is physically impossible to accidentally access the first circuit while it is energized or charged, thus reliably preventing errors by the operator.
[0040] [Embodiment 2] Another embodiment relating to this disclosure will be described with reference to Figure 6. Figure 6 is a transparent side view of the switchgear 100A, showing the compartment of the switchgear 100A in this embodiment. The switchgear 100A differs from the switchgear 100 in that the first cable 12 and the second cable 42 are located below the first circuit breaker 11 and the second circuit breaker 41.
[0041] In the switchgear 100, the first cable 12 and the second cable 42 are located to the sides of the first circuit breaker 11 and the second circuit breaker 41. Therefore, as shown in the diagrams labeled #401 and #402 in Figure 4, space is required to accommodate the first cable 12 and the second cable 42 to the sides of the first circuit breaker 11 and the second circuit breaker 41, which increases the width of the switchgear 100 accordingly.
[0042] In contrast, in the switchgear 100A, the first cable 12 and the second cable 42 are located below the first circuit breaker 11 and the second circuit breaker 41. Therefore, there is no need to secure space to place the first cable 12 and the second cable 42 to the sides of the first circuit breaker 11 and the second circuit breaker 41, and the width can be reduced compared to the switchgear 100. However, the height and front-to-back dimensions are slightly larger than those of the switchgear 100.
[0043] 〔summary〕 A switchgear according to Embodiment 1 of the present disclosure comprises a first circuit breaker, a second circuit breaker, a busbar connected via a conductor to one end of each of the first and second circuit breakers, a first cable connected to the other end of the first circuit breaker, a second cable connected to the other end of the second circuit breaker, and a housing, wherein the first circuit breaker is located on the front side inside the housing, and the second circuit breaker is located on the rear side inside the housing, and the inside of the housing is divided by a plurality of plates into a busbar room for housing the busbar, a first circuit breaker room for housing the first circuit breaker, a second circuit breaker room for housing the second circuit breaker, a first cable room for housing the first cable, and a second cable room for housing the second cable, wherein the first circuit breaker room and the first cable room are located on the front side of the housing, and the second circuit breaker room and the second cable room are located on the rear side of the housing, and the housing has doors on the front and rear sides.
[0044] In the switchgear according to Embodiment 2 of the present disclosure, in Embodiment 1, the housing is divisible into a front housing located on the front side and a rear housing located on the rear side, the first circuit breaker and the first cable are housed in the front housing and the second circuit breaker and the second cable are housed in the rear housing and are unitized, the busbar is housed in either the front housing or the rear housing, the first cable room and the second cable room are partitioned by back plates facing the doors of the front housing and the rear housing, and the busbar room is partitioned into a front side and a rear side.
[0045] In the switchgear according to embodiment 3 of the present disclosure, in embodiment 1 or 2, the busbar is a three-phase three-wire type, and the arrangement of each phase in the busbar is the same on the front side and the rear side.
[0046] In the switchgear according to Embodiment 4 of the present disclosure, in Embodiment 1 or 2, the busbar is a three-phase three-wire system, and the arrangement of each phase in the busbar is reversed on the front side and the rear side.
[0047] This disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of this disclosure. [Explanation of symbols]
[0048] 11. First circuit breaker 12. Cable No. 1 30 busbar 31, 32 Conductors 41. Second circuit breaker 42 Second Cable 50 cabinets 51 Front cabinet 52 Rear Enclosure 60 partition plates (board materials) 100, 100A switchgear 101 Front 102 Rear 511 Front Door 521 Rear door 512,522 backboard CP1 busbar room CP2 No. 1 Circuit Breaker Room CP3 Second Circuit Breaker Room CP4 Cable Room 1 CP5 Second Cable Room
Claims
1. The first circuit breaker, The second circuit breaker, A busbar connected via a conductor to one end of each of the first and second circuit breakers, A first cable connected to the other end of the first circuit breaker, The second cable connected to the other end of the second circuit breaker, Equipped with a casing, The first circuit breaker is located on the front side inside the housing. The second circuit breaker is located on the rear side inside the housing, The inside of the aforementioned enclosure is, A busbar room for housing the aforementioned busbar, The first circuit breaker room housing the first circuit breaker, The second circuit breaker room housing the second circuit breaker, A first cable room for housing the first cable, The second cable chamber, which houses the second cable, is partitioned by a plurality of plate materials. The first circuit breaker room and the first cable room are located on the front side of the housing. The second circuit breaker room and the second cable room are located on the rear side of the housing. The aforementioned enclosure is a switchgear having doors on the front and rear.
2. The aforementioned enclosure is divisible into a front enclosure located on the front side and a rear enclosure located on the rear side. The front housing houses the first circuit breaker and the first cable, and the rear housing houses the second circuit breaker and the second cable, forming a unit; the busbar is housed in either the front housing or the rear housing. The switchgear according to claim 1, wherein the first cable chamber and the second cable chamber are partitioned by the back plates facing the doors of the front and rear housings, and the busbar chamber is partitioned into a front side and a rear side.
3. The switchgear according to claim 1 or 2, wherein the busbar is a three-phase three-wire system, and the arrangement of each phase in the busbar is the same on the front side and the rear side.
4. The switchgear according to claim 1 or 2, wherein the busbar is a three-phase three-wire system, and the arrangement of each phase in the busbar is reversed on the front side and the rear side.