Switch gear

Abstract

To provide a switchgear capable of suppressing discharge of gas from a ventilation port at the occurrence of an internal arc accident in a housing.SOLUTION: A switchgear according to an embodiment comprises a housing, a main circuit part, a pressure release port, a ventilation port, a first partition plate, and a second partition plate. The main circuit part is accommodated in the housing. The pressure release port is provided in a ceiling part of the housing. The ventilation port is provided in the housing. The first partition plate is provided between the ventilation port and a part of the main circuit part. The second partition plate is provided between the first partition plate and the part of the main circuit part and in the vicinity of and above the part of the main circuit part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a switchgear. [Background technology]

[0002] BACKGROUND ART Conventionally, a switchgear in which a vacuum circuit breaker or the like is housed in a metal housing is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-213314 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional switchgear has ventilation holes on the front and back of the housing to prevent the temperature inside the switchgear panel from rising. Therefore, if an internal arc fault occurs inside the housing, there is a risk that high-temperature, high-pressure gas generated from the ventilation holes will be released.

[0005] One example of a problem to be solved by the present invention is to provide a switchgear that suppresses gas from being released from a ventilation opening when an internal arc accident occurs inside a housing. [Means for solving the problem]

[0006] The switchgear according to the embodiment includes a housing, a main circuit section, a pressure relief port, a ventilation port, a first partition plate, and a second partition plate. The housing is composed of a ceiling portion, a lower wall portion provided at a position facing the ceiling portion, and side wall portions connecting the ceiling portion and the lower wall portion. The main circuit unit is accommodated in the housing. The above-mentioned sky The ventilation opening is provided in the well. In the side wall portion, in the vicinity of the lower wall portion The first partition plate is provided between the ventilation opening and a portion of the main circuit section. The second partition plate is provided between the first partition plate and the portion of the main circuit section, near and above the portion of the main circuit section.And the second partition plate is formed of a member that is more thermally fusible than the members around the second partition plate. When an arc occurs inside the housing, it melts through the gas generated by the arc, and forms a flow path that increases the fluidity of the generated gas to the pressure release port.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0008] (Embodiment) Hereinafter, the switch gear according to the embodiment will be described with reference to the drawings. The configurations of the embodiments described below, as well as the actions and results (effects) brought about by such configurations, are merely examples and are not limited to the following description.

[0009] Also, modified examples of the embodiments disclosed below include similar components. Therefore, hereinafter, the same reference numerals will be given to those similar components, and overlapping descriptions will be omitted. Note that in this specification, ordinal numbers are used only for distinguishing parts and members and do not indicate order or priority.

[0010] Also, in the following figures, for convenience, three mutually orthogonal directions are defined. The X direction is a direction along the front-rear direction of the switch gear 1. The Y direction is a direction along the width direction of the switch gear 1 and can also be referred to as the left-right direction. The Z direction is a direction along the height direction of the switch gear 1 and can also be referred to as the up-down direction. Also, the X direction is an example of the first direction.

[0011] FIG. 1 is a perspective view of the switchgear 1 according to this embodiment. FIG. 2 is a cross-sectional view of the switchgear 1 according to this embodiment. As shown in FIGS. 1 and 2, the switchgear 1 of this embodiment includes a housing 11, a pressure relief port 12, a flapper 13, a ventilation port 14, a storage device 15, an upper busbar chamber 16, a lower busbar chamber 17, a breaking portion 18, a main circuit portion 19, a ventilation port barrier 20, and an induction barrier 21. In other words, the switchgear 1 is a so-called metal-enclosed switchgear in which the storage device 15 is housed in a metal housing 11. Note that the switchgear 1 is not limited to this example. The housing 11 may also be referred to as a panel, a closed box, or the like.

[0012] The housing 11 is made of metal, for example, and is configured in a rectangular parallelepiped box shape. The housing 11 has a lower wall portion 11a, side wall portions 11b, and an upper wall portion 11c. The lower wall portion 11a extends along a direction orthogonal to the Z direction (XY plane).

[0013] The side wall portions 11b project so as to surround from the end of the lower wall portion 11a and extend upward (+Z direction).

[0014] The upper wall portion 11c is located on the opposite side with a space from the lower wall portion 11a and extends along a direction orthogonal to the Z direction (XY plane). Note that the upper wall portion 11c is an example of a ceiling portion.

[0015] The pressure relief port 12 discharges the gas generated when an internal arc accident occurs inside the housing 11 of the switchgear 1 to the outside. The pressure relief port 12 opens from the upper wall portion 11c of the housing 11. Note that the number and shape of the pressure relief port 12 may be appropriately changed.

[0016] The flapper 13 restricts the gas discharged from the pressure relief port 12 when an internal arc accident occurs inside the housing 11. The flapper 13 is provided on the upper wall portion 11c of the housing 11 so as to be openable and closable by a hinge or a score line and can cover the pressure relief port 12. Note that the number and shape of the flapper 13 may be appropriately changed in correspondence with the number and shape of the pressure relief port 12.

[0017] The ventilation opening 14 ventilates the air inside the housing 11. In the present embodiment, the ventilation opening 14 is provided on the side wall portion 11b facing the forward direction (+X direction). Note that the arrangement position of the ventilation opening 14 may be appropriately changed as long as it is on the side wall portion 11b. The ventilation opening 14 is provided with a plurality of perforated holes in a perforated pattern, and the air inside the housing 11 can be ventilated.

[0018] The storage device 15 includes, for example, devices such as a circuit breaker. The storage device 15 is stored in the housing 11 and is divided into an upper-stage storage device 151 and a lower-stage storage device 152 in the vertical direction (Z direction) of the housing 11. In the present embodiment, two storage devices 15 are stored in the housing 11, but a larger number of storage devices 15 may be stored in the housing 11.

[0019] An upper-stage bus bar chamber 16 is provided in the upper-stage storage device 151. The upper-stage bus bar chamber 16 is a space surrounded by the upper wall portion 11c and an upper-stage bus bar chamber partition plate 161 that partitions the upper-stage bus bar chamber 16.

[0020] The upper-stage bus bar chamber partition plate 161 extends along the X direction (YZ plane) and then extends along a direction orthogonal to the X direction (YZ plane). The upper-stage bus bar chamber partition plate 161 is provided with, for example, a plurality of perforated holes in a perforated pattern, and the gas generated in the internal arc accident can be ventilated.

[0021] A lower-stage bus bar chamber 17 is provided in the lower-stage storage device 152. The lower-stage bus bar chamber 17 is a space surrounded by a lower-stage bus bar chamber partition plate 171 that defines the lower-stage bus bar chamber 17 and a part of the induction barrier 21. Note that the lower-stage bus bar chamber 17 is an example of a bus bar chamber.

[0022] The lower-stage bus bar chamber partition plate 171 is composed of two partitions made of metal that extend along the X direction (YZ plane). The lower-stage bus bar chamber partition plate 171 is provided with, for example, a plurality of perforated holes in a perforated pattern, and the gas generated in the internal arc accident can be ventilated. Note that the lower-stage bus bar chamber partition plate 171 is an example of a third partition plate.

[0023] The disconnection part 18 is fixed to the upper storage device 151 and the lower storage device 152, and a plurality of them are arranged side by side in the left - right direction (Y direction). A part of the plurality of disconnection parts 18 is housed in the upper busbar chamber 16 and the lower busbar chamber 17.

[0024] The main circuit part 19 has an upper main circuit 191 and a lower main circuit 192. The main circuit part 19 is composed of a metal such as copper or aluminum.

[0025] The upper main circuit 191 is connected to a part of the disconnection part 18 fixed to the upper storage device 151. The upper main circuit 191 is formed in an L - shape, for example, and a power cable is connected thereto.

[0026] The lower main circuit 192 is connected to a part of the disconnection part 18 fixed to the lower storage device 152. The lower main circuit 192 extends in the forward direction (+X direction), for example, and is formed to be inclined downward (-Z direction) as it approaches the ventilation port 14, and a power cable is connected thereto.

[0027] The ventilation port barrier 20 blocks the gas released during an internal arc accident from being released from the ventilation port 14. In this embodiment, the ventilation port barrier 20 is located between the ventilation port 14 and the lower main circuit 192. The arrangement position of the ventilation port barrier 20 is closer to the ventilation port 14 side than the lower main circuit 192 side.

[0028] The ventilation port barrier 20 protrudes from the lower wall part 11a and extends along the direction orthogonal to the X direction (YZ plane). The size of the ventilation port barrier 20 is larger than the size of the ventilation port 14 so that gas does not leak from the ventilation port 14. Note that the ventilation port barrier 20 is an example of the first partition plate.

[0029] The induction barrier 21 is made of metal and guides the gas to the pressure - relief port 12 opened in the upper wall part 11c when an internal arc occurs in the lower main circuit 192. The induction barrier 21 is located above and in the vicinity of the lower main circuit 192 rather than the ventilation port barrier 20.

[0030] A part of the induction barrier 21 is integrated with the lower busbar chamber partition plate 171 to surround the lower busbar chamber 17 and extends along a direction perpendicular to the X direction (YZ plane). The lower end (-Z direction) of the induction barrier 21 is inclined forward (+X direction) as it approaches the ventilation opening 14. Note that the induction barrier 21 is an example of the second partition plate.

[0031] In this embodiment, as an example, there is one inclined portion of the induction barrier 21, but a plurality of inclined portions may be provided along the height direction (Z direction). Also, by processing the lower busbar chamber partition plate 171 into a shape like the induction barrier 21, the induction barrier 21 may not be provided.

[0032] The partition plate 22 prevents the ventilation opening barrier 20 from melting due to the lower main circuit 192 reaching a high temperature when an internal arc occurs in the lower main circuit 192. The partition plate 22 protrudes from the lower wall portion 11a and extends along a direction perpendicular to the X direction (YZ plane).

[0033] In this embodiment, the partition plate 22 is located between the ventilation opening barrier 20 and the lower main circuit 192. The arrangement position of the partition plate 22 is closer to the ventilation opening barrier 20 side than the lower main circuit 192 side. Note that the partition plate 22 is an example of the fourth partition plate.

[0034] In this embodiment, as an example, one partition plate 22 is arranged, but a plurality of partition plates 22 may be arranged along the front - rear direction (X direction).

[0035] As described above, the switchgear 1 of this embodiment includes a housing 11, a pressure - relief port 12 in the upper wall portion 11c of the housing 11, a ventilation opening 14 provided in the housing 11, a main circuit portion 19 accommodated in the housing 11, a ventilation opening barrier 20 provided between the ventilation opening 14 and a part of the main circuit portion 19, and an induction barrier 21 provided near and above a part of the main circuit portion 19 between the ventilation opening barrier 20 and a part of the main circuit portion 19.

[0036] When an internal arc accident occurs inside the housing 11 of the switchgear 1 of the present embodiment, an internal arc occurs in the lower main circuit 192 of the main circuit section 19 housed in the housing 11, becoming hot and melting to generate high-temperature and high-pressure gas. The generated gas diffuses isotropically around the source of generation.

[0037] The gas that reaches the upper wall portion 11c of the housing 11 lifts the flapper 13 provided on the upper wall portion 11c of the housing 11 by pressure and discharges it to the outside through the pressure release port 12.

[0038] The ventilation port 14 is blocked by the ventilation port barrier 20. The ventilation port barrier 20 prevents the gas from being discharged to the outside through the ventilation port 14 by stopping the gas heading towards the ventilation port 14.

[0039] Between the ventilation port barrier 20 and the lower main circuit 192 of the main circuit section 19, the guide barrier 21 provided in the vicinity and above the lower main circuit 192 is more likely to melt compared to other parts. By being melted by the high-temperature and high-pressure gas, a hole is opened in the guide barrier 21 and a flow path is formed upward. Thereby, the guide barrier 21 can guide the gas upward.

[0040] Thereby, the gas is more likely to be discharged through a position close to the upper wall portion 11c. Also, when the gas is discharged through the guide barrier 21, the ventilation port barrier 20 is less likely to be exposed to the gas. Therefore, the switchgear 1 of the present embodiment stops discharging gas from the ventilation port 14.

[0041] Also, in the present embodiment, the main circuit section 19 has an upper main circuit 191 and a lower main circuit 192, is located in the vicinity of the lower main circuit 192 above the lower main circuit 192, extends in the direction along the upper wall portion 11c, and further includes a lower busbar chamber partition plate 171 that defines the lower busbar chamber 17 inside the housing 11. And the guide barrier 21 extends in a direction intersecting the lower busbar chamber partition plate 171 and is integrally formed with the lower busbar chamber partition plate 171. Thereby, when an internal arc occurs in the lower main circuit 192, the lower busbar chamber partition plate 171 also becomes more likely to melt, similar to the guide barrier 21.

[0042] Therefore, similar to the induction barrier 21, holes are opened in the lower busbar chamber partition plate 171 by being melted by high-temperature and high-pressure gas, and flow paths are formed. Thereby, the induction barrier 21 can guide gas upward, and it becomes more difficult for the ventilation port barrier 20 to be exposed to the gas.

[0043] Also, in the present embodiment, the induction barrier 21 is inclined in the forward direction (+X direction) as the lower end in the downward direction (-Z direction) approaches the ventilation port 14. Thereby, the gas generated in the lower main circuit 192 can be guided to the upper wall portion 11c.

[0044] Also, in the present embodiment, the induction barrier 21 and the lower busbar chamber partition plate 171 are made of metal. Thereby, the induction barrier 21 and the lower busbar chamber partition plate 171 are more likely to melt than other parts not made of metal. Therefore, it is possible to prevent parts other than the induction barrier 21 and the lower busbar chamber partition plate 171 from melting and releasing gas.

[0045] Also, in the present embodiment, the ventilation port barrier 20 is larger than the size of the ventilation port 14. Thereby, the gas flowing toward the ventilation port 14 is further blocked.

[0046] Also, in the present embodiment, a partition plate 22 is further provided between the ventilation port barrier 20 and the lower main circuit 192 and facing the ventilation port barrier 20. The partition plate 22 is located closer to the ventilation port 14 than the induction barrier 21. Thereby, it is possible to prevent the ventilation port barrier 20 from melting due to the gas flowing toward the ventilation port 14. Therefore, the partition plate 22 suppresses the release of gas from the ventilation port 14 when an internal arc occurs in the lower main circuit 192.

[0047] Also, since the switchgear 1 of the present embodiment no longer releases gas from the ventilation port 14, the safety of the workers working around the housing 11 of the switchgear 1 is improved.

[0048] (Modification example) FIG. 3 is a cross-sectional view of the switch gear 1A according to a modification of the present embodiment. As shown in FIG. 3, in this modification, the lower end (-Z direction) of the guide barrier 21 is inclined in the forward direction (+X direction) toward the upper wall portion 11c. Further, the upper end (+Z direction) of the partition plate 22a is inclined in the forward direction (+X direction) toward the upper wall portion 11c. Even with such a configuration, the gas generated by the internal arc accident can be guided to the upper wall portion 11c. Note that the inclination angles of the guide barrier 21 and the partition plate 22a are not limited to those in the above-described embodiment and modifications.

[0049] Although some embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

Description of Reference Numerals

[0050] 1, 1A Switch gear 11 Housing 11c Upper wall portion (ceiling portion) 12 Pressure release port 13 Flapper 14 Ventilation port 17 Lower bus bar chamber (bus bar chamber) 171 Lower bus bar chamber partition plate (third partition plate) 19 Main circuit section 191 Upper main circuit 192 Lower main circuit 20 Ventilation port barrier (first partition plate) 21 Guide barrier (second partition plate) 22, 22a Partition plate (fourth partition plate) X direction First direction

Claims

Claim 1. A housing comprising a ceiling portion, a lower wall portion provided at a position facing the ceiling portion, and side wall portions connecting the ceiling portion and the lower wall portion, a main circuit portion housed in the housing, a pressure relief port provided in the ceiling portion, a ventilation port provided in the side wall portion in the vicinity of the lower wall portion, a first partition plate provided between the ventilation port and a part of the main circuit portion, a second partition plate provided in the vicinity of and above the part of the main circuit portion between the first partition plate and the part of the main circuit portion, and comprising the second partition plate is formed of a member that is more thermally fusible than the members around the second partition plate, and when an arc occurs inside the housing, it melts through the gas generated by the arc to form a flow path that increases the fluidity of the generated gas to the pressure relief port, a switch gear. Claim 2. The main circuit portion has an upper main circuit and a lower main circuit, further comprising a third partition plate that is formed of a member that is more thermally fusible than the surrounding members, melts through the gas, is located near the lower main circuit above the lower main circuit, extends in a direction along the ceiling portion, and defines a bus bar chamber inside the housing, the second partition plate is integrally formed with the third partition plate, The switch gear according to claim 1. Claim 3. One end of the second partition plate is inclined so as to face the lower wall portion or the ceiling portion with respect to the ventilation port, The switch gear according to claim 2. Claim 4. The second partition plate and the third partition plate are made of a metal that is more thermally fusible than the surrounding members, The switch gear according to claim 2. Claim 5. The first partition plate is larger than the size of the ventilation port, The switch gear according to claim 1. Claim 6. further comprising a fourth partition plate located between the first partition plate and the lower main circuit and facing the first partition plate, the fourth partition plate is located closer to the ventilation port than the second partition plate, The switch gear according to any one of claims 2 to 4.

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