JP6800705B2 - Metal closure type switch gear - Google Patents

Description

Embodiments of the present invention relate to metal closed switch gears.

As a metal closed type switch gear, for example, a gear that releases gas to the outside through an opening of a ceiling portion is known in order to reduce the pressure inside the box body that has risen due to the generation of an arc. During normal operation, the opening is closed by a flapper, and the flapper is opened by, for example, an increase in pressure inside the box body.

Japanese Unexamined Patent Publication No. 2014-96882

For example, if the metal closed switch gear can more reliably release the internal gas upward, the metal closed switch gear can be used with more peace of mind.

The metal closure type switch gear according to one embodiment includes a box body, a door, a rear wall, an upper wall, and a partition wall. The box body has an upper electric system having an upper circuit breaker room, an upper cable room, and an upper bus room, and a lower circuit breaker room, a lower cable room, and a lower bus room located below the upper electric system. A lower electrical system is provided. The door is provided in the box body and can open and close the upper circuit breaker room and the lower circuit breaker room. The rear wall is provided on the box body, is located on the opposite side of the door, and is provided with a first vent that communicates with the upper cable chamber. The upper wall is provided in the box body and is located above the upper electric system, closes the first opening communicating with the upper cable chamber, and opens the first opening when the pressure of the upper cable chamber rises. A first flapper configured to be open and a second vent that communicates with the upper cable chamber are provided. The partition wall is provided in the box body, and partitions the upper circuit breaker room, the upper cable room, the upper bus room, the lower circuit breaker room, the lower cable room, and the lower bus room, and divides the upper cable. a second flapper configured to open the second opening when the pressure increase in the lower breaker compartment with closing a second opening which communicates with the chamber and the lower breaker compartment, said upper cable chamber A third flapper configured to close the third opening that communicates with the lower cable chamber and open the third opening when the pressure of the lower cable chamber rises, and the upper cable chamber and the lower bus chamber. A fourth flapper is provided, which is configured to close the fourth opening for communicating with and to open the fourth opening when the pressure of the lower bus chamber rises .

FIG. 1 is a cross-sectional view schematically showing a metal closed type switch gear according to one embodiment. FIG. 2 is a cross-sectional view showing a metal closed type switch gear in a normal state of one embodiment. FIG. 3 is a cross-sectional view showing a metal closed type switch when a pressure rise occurs in the upper cable chamber of one embodiment. FIG. 4 is a cross-sectional view showing a metal closed type switch when a pressure rise occurs in the lower cable chamber of one embodiment.

Hereinafter, one embodiment will be described with reference to FIGS. 1 to 4. In this specification, the vertically upper direction is basically defined as the upward direction, and the vertically lower direction is defined as the downward direction. Further, in the present specification, a plurality of expressions may be described with respect to the components according to the embodiment and the description of the elements. The components and descriptions in which a plurality of expressions are expressed may be expressed in other expressions not described. Further, components and explanations that are not expressed in a plurality of expressions may be expressed in other expressions that are not described.

FIG. 1 is a cross-sectional view schematically showing a metal closed type switch gear 10 according to one embodiment. The metal closing type switch gear 10 of the present embodiment is, for example, a two-stage metal closing type switch gear having a two-line power receiving configuration. The metal closed type switch gear 10 is not limited to this example.

As shown in each drawing, the X-axis and the Z-axis are defined herein. The X-axis and the Z-axis are orthogonal to each other. The X-axis is along the depth of the metal closed switch gear 10. The Z-axis is along the height of the metal closed switch gear 10.

As shown in FIG. 1, the metal closing type switch gear 10 has a box body 11 and a housing device 12. The box body 11 may also be referred to as a housing, for example. The box body 11 has a housing portion 21 and a front door 22. The front door 22 is an example of a door.

The accommodating portion 21 is formed in a substantially box shape that is open in the positive direction along the X-axis (the direction indicated by the arrow on the X-axis, the forward direction). In other words, the opening end 21a is provided at the front end of the accommodating portion 21. The opening end 21a is a portion where the inside of the concave accommodating portion 21 is opened. The accommodating portion 21 may have another shape.

The front door 22 can be opened and closed inside the accommodating portion 21, and is attached to the accommodating portion 21 by, for example, a hinge. The front door 22 closes the opening end 21a of the accommodating portion 21 and is located at the front end of the box body 11. In other words, the front door 22 is provided on the box body 11.

The accommodating portion 21 has a ceiling plate 25, a back plate 26, and a floor plate 27. In other words, the ceiling plate 25, the back plate 26, and the floor plate 27 are provided on the box body 11. The ceiling plate 25 is an example of an upper wall. The back plate 26 is an example of a rear wall.

The ceiling plate 25 is located at the end of the accommodating portion 21 in the positive direction (direction indicated by the arrow on the Z axis, upward direction) along the Z axis. The back plate 26 is located at the end of the accommodating portion 21 in the negative direction (opposite direction of the arrow on the X axis, backward direction) along the X axis. The floor plate 27 is located at the end of the accommodating portion 21 in the negative direction (opposite direction of the arrow on the Z axis, downward direction) along the Z axis.

The front door 22 is separated from the back plate 26 in the front direction. The back plate 26 is located on the opposite side of the front door 22. The ceiling plate 25 is separated from the floor plate 27 in the upward direction. The floor plate 27 is located on the opposite side of the ceiling plate 25.

When the metal closed switch gear 10 is installed, for example, the floor plate 27 is in contact with the ground and supported. For example, the rubber legs attached to the floor plate 27 may come into contact with the ground, and the floor plate 27 may be separated from the ground. In this way, the floorboard 27 faces the ground. Further, the ceiling plate 25 faces, for example, the ceiling of a building. The metal closing type switch gear 10 is installed so as to be separated from the ceiling plate 25 and the ceiling of the building.

Further, the front door 22 faces a space (for example, a passage) through which maintenance personnel and the like can pass. On the other hand, the back plate 26 faces the wall of the building. The metal closing type switch gear 10 is installed so as to be separated from the back plate 26 and the wall of the building. The installation mode of the metal closed type switch gear 10 is not limited to the example described here.

An upper electric system 31 and a lower electric system 32 are provided inside the box 11. In the present embodiment, two electric systems 31 and 32 are provided in the box body 11, but more electric systems may be provided in the box body 11. Further, a part of the parts forming the upper electric system 31 and the lower electric system 32 such as a cable may be outside the box body 11.

A partition plate 35 is provided on the box body 11. The partition plate 35 is an example of a partition wall. The partition plate 35 is provided inside the accommodating portion 21, and also partitions the upper electric system 31 and the lower electric system 32.

The upper electric system 31 has an upper circuit breaker chamber 41, an upper cable chamber 42, and an upper bus chamber 43. The upper electric system 31 may have another configuration. The upper circuit breaker chamber 41, the upper cable chamber 42, and the upper bus chamber 43 are partitioned by a partition plate 35. The upper circuit breaker chamber 41, the upper cable chamber 42, and the upper bus chamber 43 may communicate with each other through holes or gaps, for example.

The upper circuit breaker chamber 41 is provided at a position closer to the front door 22 than the upper cable chamber 42 and the upper bus chamber 43. In other words, the upper circuit breaker chamber 41 is provided on the front side of the box body 11.

The upper cable chamber 42 and the upper bus chamber 43 are provided at positions closer to the back plate 26 than the upper circuit breaker chamber 41. In other words, the upper cable chamber 42 and the upper bus chamber 43 are provided on the back side of the box body 11.

The partition plate 35 has a first upper partition wall 45 and a second upper partition wall 46. The first upper partition wall 45 is provided substantially in the center of the box body 11 in the direction along the X axis, and partitions the upper circuit breaker chamber 41, the upper cable chamber 42, and the upper bus chamber 43. In other words, the first upper partition wall 45 partitions the inside of the box body 11 into a front side and a back side.

The second upper partition wall 46 is formed in an L shape and is connected to the intermediate portion of the first upper partition wall 45 and the ceiling plate 25. The second upper partition wall 46 separates the upper cable chamber 42 and the upper bus chamber 43.

The lower electric system 32 has a lower circuit breaker chamber 51, a lower cable chamber 52, and a lower bus chamber 53. The lower electric system 32 may have another configuration. The lower circuit breaker chamber 51, the lower cable chamber 52, and the lower bus chamber 53 are partitioned by a partition plate 35.

The lower circuit breaker chamber 51, the lower cable chamber 52, and the lower bus chamber 53 are located below the upper electrical system 31. In other words, the upper electric system 31 is stacked on the lower electric system 32 having the lower circuit breaker chamber 51, the lower cable chamber 52, and the lower bus chamber 53.

The lower circuit breaker chamber 51, the lower cable chamber 52, and the lower bus chamber 53 are each located below at least a part of the upper electric system 31. A part of the upper electric system 31 may be at the same height as the lower electric system 32, or may be lower than the lower electric system 32.

The lower circuit breaker chamber 51 is provided at a position closer to the front door 22 than the lower cable chamber 52 and the lower bus chamber 53. In other words, the lower circuit breaker chamber 51 is provided on the front side of the box body 11.

The lower cable chamber 52 and the lower bus chamber 53 are provided at positions closer to the back plate 26 than the lower circuit breaker chamber 51. In other words, the lower cable chamber 52 and the lower bus chamber 53 are provided on the back side of the box body 11.

The partition plate 35 further includes a first lower partition wall 55, a second lower partition wall 56, and a third lower partition wall 57. The first lower partition wall 55 is provided substantially in the center of the box body 11 in the direction along the X axis, and partitions the lower circuit breaker chamber 51, the lower cable chamber 52, and the lower bus chamber 53. In other words, the first lower partition wall 55 partitions the inside of the box body 11 into a front side and a back side. The first lower partition wall 55 is continuous with the first upper partition wall 45.

The second lower partition wall 56 is formed in an L shape and is connected to the intermediate portion of the first lower partition wall 55 and the floor plate 27. The third lower partition wall 57 is formed in an L shape and is connected to the upper surface 56a of the second lower partition wall 56 and the first lower partition wall 55. The upper surface 56a faces upward.

The second lower partition wall 56 and the third lower partition wall 57 partition the lower cable chamber 52 and the lower bus chamber 53. Further, the second lower partition wall 56 and the third lower partition wall 57 partition the lower cable chamber 52 and the lower bus chamber 53 from the upper cable chamber 42. The upper cable chamber 42 is formed from the floor surface 27a of the floor plate 27 to the ceiling surface 25a of the ceiling plate 25.

The partition plate 35 further has an intermediate plate 59. The intermediate plate 59 is provided substantially in the center in the direction along the Z axis of the box body 11, and extends from the first upper partition wall 45 to the opening end 21a of the accommodating portion 21. The intermediate plate 59 partitions the upper circuit breaker chamber 41 and the lower circuit breaker chamber 51.

In the direction along the X-axis, the upper bus chamber 43 is located between the upper circuit breaker chamber 41 and the upper cable chamber 42. Further, the lower bus chamber 53 is located between the lower circuit breaker chamber 51 and the upper cable chamber 42, and the lower cable chamber 52 is located between the lower circuit breaker chamber 51 and the upper cable chamber 42.

The lower cable chamber 52 is adjacent to the upper cable chamber 42 via the second lower partition wall 56. The lower bus chamber 53 is adjacent to the upper cable chamber 42 via the third lower partition wall 57. Further, the lower circuit breaker chamber 51 is adjacent to the upper cable chamber 42 via the first lower partition wall 55.

The accommodating device 12 includes an upper disconnector 61, an upper upper disconnector 62, an upper lower disconnector 63, an upper main circuit conductor 64, an upper bus 65, a lower disconnector 71, and a lower upper disconnector 72. The lower lower disconnecting portion 73, the lower main circuit conductor 74, and the lower bus 75 are included. The accommodating device 12 may include other devices.

The upper circuit breaker 61 is, for example, a vacuum circuit breaker (VCB) and is housed in the upper circuit breaker chamber 41. The upper upper disconnecting portion 62 is fixed to the first upper partition wall 45 and is connected to the upper conductor 61a of the upper circuit breaker 61. The upper lower disconnecting portion 63 is fixed to the first upper partition wall 45 and is connected to the lower conductor 61b of the upper circuit breaker 61.

The upper main circuit conductor 64 is housed in the upper cable chamber 42 and is connected to the upper lower disconnecting portion 63. The upper main circuit conductor 64 is formed in an L shape, for example, and a power cable is connected to the upper main circuit conductor 64. The upper bus 65 is housed in the upper bus chamber 43 and is connected to the upper upper disconnector 62. The upper bus 65 is connected to, for example, an adjacent board.

The lower circuit breaker 71 is, for example, a VCB, and is housed in the lower circuit breaker chamber 51. The lower upper disconnecting portion 72 is fixed to the first lower partition wall 55 and is connected to the upper conductor 71a of the lower circuit breaker 71. The lower lower disconnecting portion 73 is fixed to the first lower partition wall 55 and is connected to the lower conductor 71b of the lower circuit breaker 71.

The lower main circuit conductor 74 is housed in the lower cable chamber 52 and is connected to the lower lower disconnecting portion 73. The lower main circuit conductor 74 is formed in an L shape, for example, and a power cable is connected to the lower main circuit conductor 74. The lower bus 75 is housed in the lower bus chamber 53 and is connected to the lower upper disconnector 72. The lower bus 75 is connected to, for example, an adjacent board.

The ends of the upper circuit breaker chamber 41 and the lower circuit breaker chamber 51 in the front direction form at least a part of the opening end 21a of the accommodating portion 21. Therefore, the front door 22 can open and close the upper circuit breaker chamber 41 and the lower circuit breaker chamber 51. That is, when the front door 22 is opened, the upper circuit breaker chamber 41 and the lower circuit breaker chamber 51 are opened to the outside of the box body 11, and the upper circuit breaker 61 and the lower circuit breaker 71 are exposed. Further, when the front door 22 is closed, the upper circuit breaker chamber 41 and the lower circuit breaker chamber 51 are closed. The front door 22 has a lock 22a. The lock 22a is, for example, a lever handle with a key, and can hold the front door 22 in a closed state.

The ceiling plate 25 is located above the upper electrical system 31 and faces the upper circuit breaker chamber 41, the upper cable chamber 42, and the upper bus chamber 43. The ceiling plate 25 is provided with a first ceiling opening 81, a second ceiling opening 82, and a third ceiling opening 83. The third ceiling opening 83 is an example of the first opening.

The first ceiling opening 81 communicates with the upper circuit breaker chamber 41. The second ceiling opening 82 communicates with the upper bus chamber 43. The third ceiling opening 83 communicates with the upper cable chamber 42. The first to third ceiling openings 81 to 83 are provided so as to be opened to the outside of the box body 11 in the upward direction. That is, the upper electric system 31 is communicated to the outside of the metal closed type switch gear 10 by the first to third ceiling openings 81 to 83.

Further, the ceiling plate 25 is provided with a first ceiling flapper 85, a second ceiling flapper 86, and a third ceiling flapper 87. The third ceiling flapper 87 is an example of the first flapper.

The first to third ceiling flappers 85 to 87 are a part of the ceiling plate 25, and are formed by, for example, providing a groove (slit) in the ceiling plate 25. The first to third ceiling flappers 85 to 87 may be separate parts attached to the ceiling plate 25.

FIG. 2 is a cross-sectional view showing a metal closed type switch gear 10 in a normal state of the present embodiment. The metal closure type switch gear 10 is in the state shown in FIG. 2, for example, before it is installed and when it is installed and used. Hereinafter, the metal closing type switch gear 10 shown in FIG. 2 will be referred to as a metal closing type switch gear 10 in a normal state.

As shown in FIG. 2, the first ceiling flapper 85 closes the first ceiling opening 81. The second ceiling flapper 86 closes the second ceiling opening 82. The third ceiling flapper 87 closes the third ceiling opening 83. The gas may pass through the gap between the first to third ceiling flappers 85 to 87 and the edges of the first to third ceiling openings 81 to 83.

As shown in FIG. 1, the first to third ceiling flappers 85 to 87 can open the first to third ceiling openings 81 to 83 by, for example, folding. For example, a plurality of perforated holes are provided in the folding portions of the first to third ceiling flappers 85 to 87, so that the first to third ceiling flappers 85 to 87 are easily broken.

As shown in FIG. 2, a plurality of exhaust ports 87a are provided in the third ceiling flapper 87. The exhaust port 87a is an example of the second vent. That is, the exhaust port 87a is provided in a part of the ceiling plate 25. The plurality of exhaust ports 87a are formed in the third ceiling flapper 87 by punching, for example. In addition, a plurality of exhaust ports may be further provided in the first ceiling flapper 85 and the second ceiling flapper 86.

In a normal state, the exhaust port 87a communicates with the upper cable chamber 42. The exhaust port 87a is provided so as to open upward to the outside of the box body 11. The total cross-sectional area of the plurality of exhaust ports 87a is smaller than the cross-sectional area of the opened third ceiling opening 83.

As shown in FIG. 1, the first lower partition wall 55 is provided with the first lower opening 91. A second lower opening 92 is provided on the upper surface 56a of the second lower partition wall 56. A third lower opening 93 is provided on the back surface 57a of the third lower partition 57. The second lower opening 92 is an example of the second opening. The back surface 57a faces the back plate 26.

The lower circuit breaker chamber 51 has a convex chamber 51a. The convex chamber 51a is a portion located above the lower cable chamber 52 and the lower bus chamber 53, and is adjacent to the upper cable chamber 42 via the first lower partition wall 55. The first lower opening 91 communicates the convex chamber 51a of the lower circuit breaker chamber 51 with the upper cable chamber 42.

The second lower opening 92 communicates the lower cable chamber 52 and the upper cable chamber 42 and opens toward the ceiling plate 25. The third lower opening 93 communicates the lower bus chamber 53 and the upper cable chamber 42. That is, the lower circuit breaker chamber 51, the lower cable chamber 52, and the lower bus chamber 53 of the lower electric system 32 are communicated with the upper cable chamber 42 by the first to third lower openings 91 to 93.

A first lower flapper 95 is provided on the first lower partition wall 55. A second lower flapper 96 is provided on the second lower partition wall 56. A third lower flapper 97 is provided on the third lower partition wall 57. The second lower flapper 96 is an example of the second flapper.

The first to third lower flappers 95 to 97 are a part of the partition plate 35, and are formed by, for example, providing a groove (slit) in the partition plate 35. The first to third lower flappers 95 to 97 may be separate parts attached to the partition plate 35.

As shown in FIG. 2, the first lower flapper 95 closes the first lower opening 91. The second lower flapper 96 closes the second lower opening 92. The third lower flapper 97 closes the third lower opening 93. The gas may pass through the gap between the first to third lower flappers 95 to 97 and the edges of the first to third lower openings 91 to 93.

As shown in FIG. 1, the first to third lower tier flappers 95 to 97 can open the first to third lower tier openings 91 to 93 by, for example, folding. For example, a plurality of perforated holes are provided in the folding portions of the first to third lower flappers 95 to 97, so that the first to third lower flappers 95 to 97 can be easily broken.

A plurality of vents 101 are provided on the back surface 56b of the second lower partition wall 56. The vent 101 is an example of a third vent. That is, the vent 101 is provided on the partition plate 35. The plurality of vents 101 are formed in the second lower partition wall 56 by punching, for example.

The vent 101 communicates the lower cable chamber 52 and the upper cable chamber 42. The back surface 56b of the second lower partition wall 56 faces the back plate 26. Therefore, the vent 101 opens toward the back plate 26. The orientation of the vent 101 is not limited to this example. The total cross-sectional area of the plurality of vents 101 is smaller than the cross-sectional area of the opened second lower opening 92.

As shown in FIG. 2, the closing flapper 102 is provided on the second lower partition wall 56. The closing flapper 102 is an example of a second closing member. The closing flapper 102 is arranged in the lower cable chamber 52, for example, and is attached to the second lower partition wall 56. The closing flapper 102 may be a part of the second lower partition wall 56.

In the normal state, the closing flapper 102 is folded and separated from the vent 101. Therefore, the vent 101 is open, and the lower cable chamber 52 and the upper cable chamber 42 communicate with each other. For example, a plurality of perforated holes are provided in the folded portion of the closing flapper 102, so that the closing flapper 102 can be easily broken.

A plurality of intake ports 105 are provided on the back plate 26. The intake port 105 is an example of the first ventilation port. The intake port 105 is located below the exhaust port 87a. The plurality of intake ports 105 are formed on the back plate 26 by punching, for example.

The intake port 105 communicates with the upper cable chamber 42. The intake port 105 is provided so as to be opened to the outside of the box body 11 in the rear direction. The intake port 105 is provided at substantially the same position as the ventilation port 101 in the direction along the Z axis.

A closing plate 106, a plurality of guides 107, and a plurality of urging members 108 are provided in the upper cable chamber 42. The closing plate 106 is an example of the first closing member.

The closing plate 106 faces a plurality of intake ports 105 and can be moved so as to approach and separate from the intake ports 105. When the closing plate 106 comes closest to the intake port 105, the closing plate 106 comes into contact with the back plate 26 and closes the plurality of intake ports 105. When the closing plate 106 is separated from the intake port 105, the intake port 105 is opened.

The plurality of guides 107 are bolts attached to, for example, the back plate 26, and extend forward from the back plate 26. The plurality of guides 107 are passed through holes provided in the closing plate 106 to guide the moving closing plate 106.

The plurality of urging members 108 are, for example, coil springs and are attached to the guide 107. The urging member 108 is interposed between the closing plate 106 and the back plate 26, and pushes the closing plate 106 in a direction away from the intake port 105. Therefore, in a state where no external force acts on the closing plate 106, the closing plate 106 is separated from the intake port 105 and the intake port 105 is opened.

As shown by the arrow in FIG. 2, outside air flows into the upper cable chamber 42 from the intake port 105 in the normal state. The air that has flowed into the upper cable chamber 42 flows into the lower cable chamber 52 through the vent 101, rises inside the upper cable chamber 42, and is discharged to the outside through the exhaust port 87a. The metal closed type switch gear 10 whose temperature has risen by the accommodating device 12 is cooled.

The intake port 105 is located below the exhaust port 87a. Therefore, relatively cold air flows into the upper cable chamber 42 from the intake port 105, and relatively hot air (gas) inside the metal closed type switch gear 10 is discharged from the exhaust port 87a. As a result, the metal closed switch gear 10 can be cooled more efficiently.

FIG. 3 is a cross-sectional view showing a metal closed type switch gear 10 when a pressure rise occurs in the upper cable chamber 42 of the present embodiment. For example, when an arc is generated in the upper cable chamber 42, the temperature of the air (gas) in the upper cable chamber 42 rises, and the pressure in the upper cable chamber 42 rises.

When the pressure in the upper cable chamber 42 rises, the pressure pushes the closing plate 106 toward the intake port 105. Since the force pushing the closing plate 106 is stronger than the force of the urging member 108, the closing plate 106 comes into contact with the back plate 26 and closes the intake port 105. In this way, the closing plate 106 closes the intake port 105 when the pressure of the upper cable chamber 42 rises. As a result, the air (gas) in the upper cable chamber 42 is suppressed from coming out of the metal closed type switch gear 10 through the intake port 105.

When the pressure in the upper cable chamber 42 rises, the pressure pushes the third ceiling flapper 87 upward and breaks. The third ceiling flapper 87 opens toward the outside of the box body 11. In this way, the third ceiling flapper 87 opens the third ceiling opening 83 when the pressure of the upper cable chamber 42 rises.

The cross-sectional area of the third ceiling opening 83 is larger than the cross-sectional area of the exhaust port 87a. Therefore, the air (gas) in the upper cable chamber 42 is discharged from the third ceiling opening 83 to the outside of the metal closing type switch gear 10 more quickly, and the pressure in the upper cable chamber 42 decreases. The air (gas) in the upper cable chamber 42 is discharged substantially upward to, for example, the space between the ceiling plate 25 and the ceiling of the building, which is a space where maintenance personnel and the like are not present.

The closing flapper 102 is arranged in the lower cable chamber 52 and is opened toward the lower cable chamber 52. Therefore, when the pressure in the upper cable chamber 42 rises, the closing flapper 102 opens the vent 101, and a part of the air (gas) in the upper cable chamber 42 flows into the lower cable chamber 52 from the vent 101.

The gas flowing into the lower cable chamber 52 raises the pressure in the lower cable chamber 52 and pushes the second lower flapper 96. The second lower flapper 96 is pushed upward and breaks. The second lower flapper 96 opens toward the upper cable chamber 42. As a result, the upper cable chamber 42 and the lower cable chamber 52 communicate with each other through the second lower opening 92 that is larger than the vent 101, and the pressure in the upper cable chamber 42 drops more quickly due to the volume expansion due to the communication. The air (gas) in the lower cable chamber 52 is discharged upward from the second lower opening 92 and heads toward the third ceiling opening 83.

The second lower flapper 96 may be pushed downward and broken due to an increase in pressure in the upper cable chamber 42. In other words, the second lower flapper 96 may be opened toward the lower cable chamber 52. As a result, the lower cable chamber 52 and the upper cable chamber 42 communicate with each other more quickly, and the pressure in the upper cable chamber 42 drops more quickly due to the volume expansion due to the communication.

Further, the first lower flapper 95 and the third lower flapper 97 may be pushed and broken by the pressure increase of the upper cable chamber 42. In this case, the first lower flapper 95 opens toward the lower circuit breaker chamber 51, and the third lower flapper 97 opens toward the lower bus chamber 53. As a result, the upper cable chamber 42 communicates with the lower circuit breaker chamber 51 and the lower bus chamber 53, and the pressure in the upper cable chamber 42 drops more quickly due to the volume expansion due to the communication.

FIG. 4 is a cross-sectional view showing a metal closed type switch gear 10 when a pressure rise occurs in the lower cable chamber 52 of the present embodiment. For example, when an arc is generated in the lower cable chamber 52, the pressure in the lower cable chamber 52 rises.

When the pressure in the lower cable chamber 52 rises, the pressure closes the flapper 102 and pushes it toward the vent 101. As a result, the closing flapper 102 is folded straight from the folded state as shown in FIG. 4, and comes into contact with the second lower partition wall 56 to close the vent 101. In this way, the closing flapper 102 closes the vent 101 when the pressure of the lower cable chamber 52 rises. As a result, the air (gas) in the lower cable chamber 52 is suppressed from being discharged backward through the ventilation port 101.

When the pressure in the lower cable chamber 52 rises, the pressure pushes the second lower flapper 96 upward and breaks. In this way, the second lower flapper 96 opens the second lower opening 92 when the pressure in the lower cable chamber 52 rises. The second lower flapper 96 opens toward the upper cable chamber 42. As a result, the upper cable chamber 42 and the lower cable chamber 52 communicate with each other through the second lower opening 92, and the pressure in the lower cable chamber 52 is rapidly reduced due to the volume expansion due to the communication.

By communicating the upper cable chamber 42 and the lower cable chamber 52, the pressure in the upper cable chamber 42 rises. As a result, as described above, the closing plate 106 closes the intake port 105, and the third ceiling flapper 87 breaks to open the third ceiling opening 83. The air (gas) in the upper cable chamber 42 is quickly discharged to the outside of the metal closing type switch gear 10 from the third ceiling opening 83, and the pressure in the upper cable chamber 42 and the lower cable chamber 52 decreases.

The air (gas) in the lower cable chamber 52 is discharged upward from the second lower opening 92 and heads toward the exhaust port 87a or the third ceiling opening 83. The air discharged upward from the second lower opening 92 easily pushes the third ceiling flapper 87 and is easily discharged from the third ceiling opening 83. As a result, the gas inside the metal closed type switch gear 10 is easily discharged from the third ceiling opening 83 in the substantially upward direction.

As shown in FIG. 1, for example, when an arc is generated in the upper circuit breaker chamber 41, the pressure in the upper circuit breaker chamber 41 rises. When the pressure in the upper circuit breaker chamber 41 rises, the pressure pushes the first ceiling flapper 85 upward and breaks. The first ceiling flapper 85 opens toward the outside of the metal closed switch gear 10. In this way, the first ceiling flapper 85 opens the first ceiling opening 81 when the pressure in the upper circuit breaker chamber 41 rises.

For example, when an arc is generated in the upper bus chamber 43, the pressure in the upper bus chamber 43 rises. When the pressure in the upper bus chamber 43 rises, the pressure pushes the second ceiling flapper 86 upward and breaks. The second ceiling flapper 86 opens toward the outside of the metal closed switch gear 10. In this way, the second ceiling flapper 86 opens the second ceiling opening 82 when the pressure of the upper bus chamber 43 rises.

When the first and second ceiling flappers 85 and 86 open the first and second ceiling openings 81 and 82, the air (gas) in the upper circuit breaker chamber 41 and the upper bus chamber 43 becomes the first and second. It is discharged to the outside of the metal closed type switch gear 10 from the ceiling openings 81 and 82 of the above. As a result, the pressure in the upper circuit breaker chamber 41 and the upper bus chamber 43 is reduced.

For example, when an arc is generated in the lower circuit breaker chamber 51, the pressure in the lower circuit breaker chamber 51 rises. When the pressure in the lower circuit breaker chamber 51 rises, the pressure pushes the first lower flapper 95 in the rear direction and breaks. The first lower flapper 95 opens toward the upper cable chamber 42. In this way, the first lower flapper 95 opens the first lower opening 91 when the pressure in the lower circuit breaker chamber 51 rises.

For example, when an arc is generated in the lower bus chamber 53, the pressure in the lower bus chamber 53 rises. When the pressure in the lower bus chamber 53 rises, the pressure pushes the third lower flapper 97 backward and breaks. The third lower flapper 97 opens toward the upper cable chamber 42. In this way, the third lower flapper 97 opens the third lower opening 93 when the pressure in the lower bus chamber 53 rises.

When the first and third lower flappers 95 and 97 open the first and third lower openings 91 and 93, the lower circuit breaker chamber 51 and the lower bus chamber 53 and the upper cable chamber 42 communicate with each other. As a result, the air (gas) in the lower circuit breaker chamber 51 and the lower bus chamber 53 is discharged from the first and third lower openings 91 and 93 to the upper cable chamber 42, and the lower circuit breaker chamber 51 and the lower bus chamber 53 are released. Pressure drops.

By communicating the lower circuit breaker chamber 51 and the lower bus chamber 53 with the upper cable chamber 42, the pressure in the upper cable chamber 42 rises. As a result, as described above, the closing plate 106 closes the intake port 105, and the third ceiling flapper 87 breaks to open the third ceiling opening 83. The air (gas) in the upper cable chamber 42 is quickly discharged to the outside of the metal closing type switch gear 10 from the third ceiling opening 83, and the pressure in the upper cable chamber 42, the lower circuit breaker chamber 51, and the lower bus chamber 53 Decreases.

As described above, when the pressure of the lower circuit breaker chamber 51, the lower cable chamber 52, and the lower bus chamber 53 of the lower electric system 32 rises, the lower circuit breaker chamber 51, the lower cable chamber 52, and the lower bus chamber 53 are in the upper stage. It communicates with the cable chamber 42. The lower electric system 32 discharges gas to the outside of the metal closed type switch gear 10 via the upper cable chamber 42. That is, the upper cable chamber 42 can be used as a common flow path for discharging the gas of the lower electric system 32 to the outside through the third ceiling opening 83 of the ceiling plate 25.

In the metal closing type switch gear 10 according to the one embodiment described above, the intake port 105 and the exhaust port 87a communicating with the upper cable chamber 42 are provided on the back plate 26 and the ceiling plate 25. Generally, the maintenance staff performs maintenance work on the metal closing type switch gear 10 in front of the front door 22 that can open and close the upper circuit breaker room 41 and the lower circuit breaker room 51. That is, the intake port 105 and the exhaust port 87a that are opened to the outside of the box body 11 generally open toward the direction away from the maintenance staff. Further, when the pressure of the upper electric system 31 rises due to the arc, the first to third ceiling flappers 85 to 87 provided on the ceiling plate 25 open the first to third ceiling openings 81 to 83, and the upper stage. The air (gas) of the electric system 31 is discharged upward. Further, when the pressure of the lower electric system 32 is increased by the arc, the first to third lower flappers 95 to 97 provided on the partition plate 35 open the first to third lower openings 91 to 93, and the lower ones are opened. The gas of the electric system 32 is discharged upward through the upper cable chamber 42 and the third ceiling opening 83 opened by the third ceiling flapper 87. Therefore, even if an arc occurs, it is possible to prevent the high-temperature and high-pressure gas inside the box 11 from being released in front of the front door 22 where a maintenance worker may be present, and the metal closed type switch. The gear 10 can be used with greater peace of mind.

The closing plate 106 closes the intake port 105 when the pressure of the upper cable chamber 42 rises. As a result, when the pressure in the upper cable chamber 42 rises due to the arc, the gas in the upper cable chamber 42 does not pass through the intake port 105 and is surely above the third ceiling opening 83 opened by the third ceiling flapper 87. Emitted in the direction. As a result, even if an arc occurs, the high-temperature and high-pressure gas inside the box 11 can be more reliably prevented from being released into the space where maintenance personnel may be present, and the metal closed type switch gear. 10 can be used with more peace of mind.

The first to third lower flappers 95 to 97 open toward the upper cable chamber 42. As a result, when the pressure in the lower circuit breaker chamber 51, the lower cable chamber 52, or the lower bus chamber 53 increases due to the arc, the first to third lower flappers 95 to 97 provided in the partition plate 35 are the first to the first to 97. The third lower openings 91 to 93 are opened, and the gas of the lower electric system 32 is discharged upward through the upper cable chamber 42 and the third ceiling opening 83 opened by the third ceiling flapper 87. Therefore, the pressure in the lower circuit breaker chamber 51, the lower cable chamber 52, or the lower bus chamber 53 can be reduced. Further, since the upper cable chamber 42 is used as a common flow path for discharging the gas of the lower electric system 32 to the outside from the third ceiling opening 83 of the ceiling plate 25, the ventilation path of the metal closed type switch gear 10 Is suppressed from becoming complicated.

The closing flapper 102 closes the vent 101 that communicates the lower cable chamber 52 and the upper cable chamber 42 when the pressure in the lower cable chamber 52 rises. Therefore, when the pressure in the lower cable chamber 52 rises, the second lower flapper 96 opens the second lower opening 92 that opens toward the ceiling plate 25, and the gas in the lower cable chamber 52 is directed upward. discharge. The gas is discharged upward from the third ceiling opening 83 located above the second lower opening 92. As a result, even if an arc occurs, the high-temperature and high-pressure gas inside the box 11 can be more reliably prevented from being released into the space where maintenance personnel may be present, and the metal closed type switch gear. 10 can be used with more peace of mind.

The closing flapper 102 opens the vent 101 when the pressure in the upper cable chamber 42 rises due to the arc. The gas in the upper cable chamber 42 flows into the lower cable chamber 52 from the vent 101, and is discharged upward from the second lower opening 92 by opening the second lower flapper 96. As a result, it is possible to prevent the volume of the upper cable chamber 42 and the space communicating with the upper cable chamber 42 from being reduced. Further, even if an arc is generated, the high-temperature and high-pressure gas inside the box 11 is more reliably prevented from being released into the space where the maintenance staff may be present, and the metal closed type switch gear 10 Can be used with greater peace of mind.

According to at least one embodiment described above, a first vent and a second vent that communicate with the upper cable chamber are provided on the rear wall and the upper wall. Therefore, the metal closed type switch gear 10 can be used with greater peace of mind.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.
The contents of the scope of claims at the time of filing are added below.
[1]
An upper electric system having an upper circuit breaker room, an upper cable room, and an upper bus room, and a lower electric system having a lower circuit breaker room, a lower cable room, and a lower bus room located below the upper electric system. With the box body provided with
A door provided on the box body that can open and close the upper circuit breaker room and the lower circuit breaker room.
A rear wall provided on the box body, located on the opposite side of the door, and provided with a first vent for communicating with the upper cable chamber.
It is provided in the box body and is located above the upper electric system, and is configured to close the first opening communicating with the upper cable chamber and open the first opening when the pressure of the upper cable chamber rises. An upper wall provided with a first flapper and a second vent that communicates with the upper cable chamber.
Provided in the box body, the upper circuit breaker room, the upper cable room, the upper bus room, the lower circuit breaker room, the lower cable room, and the lower bus room are partitioned, and the upper cable room and the lower bus bar are cut off. The lower circuit breaker chamber, the lower cable chamber, or the lower bus that closes the second opening that communicates with the instrument chamber, the lower cable chamber, and one of the lower bus chambers and communicates with the second opening. A partition wall provided with a second flapper configured to open the second opening when the pressure of the chamber rises, and
A metal closure type switch gear equipped with.
[2]
The metal closing type switch gear according to [1], further comprising a first closing member provided in the upper cable chamber and configured to close the first vent when the pressure in the upper cable chamber rises.
[3]
The second flapper is a metal closure type switch gear according to [1] or [2], which is configured to open toward the upper cable chamber.
[4]
Has a second closing member
The second opening communicates with the lower cable chamber and the upper cable chamber and opens toward the upper wall.
The partition wall is provided with a third vent for communicating the lower cable chamber and the upper cable chamber.
The second closing member is configured to close the third vent when the pressure in the lower cable chamber rises.
A metal closed type switch gear according to any one of [1] to [3].
[5]
The metal closing type switch gear according to [4], wherein the second closing member is configured to open the third vent when the pressure in the upper cable chamber rises.

10 ... Metal closure type switch gear, 11 ... Box body, 12 ... Containment equipment, 22 ... Front door, 25 ... Ceiling plate, 26 ... Back plate, 31 ... Upper electrical system, 32 ... Lower electrical system, 35 ... Partition plate, 41 ... Upper circuit breaker room, 42 ... Upper cable room, 43 ... Upper bus room, 51 ... Lower circuit breaker room, 52 ... Lower cable room, 53 ... Lower bus room, 81 ... First ceiling opening, 82 ... Second Ceiling opening, 83 ... 3rd ceiling opening, 85 ... 1st ceiling flapper, 86 ... 2nd ceiling flapper, 87 ... 3rd ceiling flapper, 87a ... exhaust port, 91 ... 1st lower opening, 92 ... 2nd lower opening, 93 ... 3rd lower opening, 95 ... 1st lower flapper, 96 ... 2nd lower flapper, 97 ... 3rd lower flapper, 101 ... vent, 102 ... blocking flapper, 105 ... intake port, 106 ... closing plate.

Claims (5)

An upper electric system having an upper circuit breaker room, an upper cable room, and an upper bus room, and a lower electric system having a lower circuit breaker room, a lower cable room, and a lower bus room located below the upper electric system. With the box body provided with
A door provided on the box body that can open and close the upper circuit breaker room and the lower circuit breaker room.
A rear wall provided on the box body, located on the opposite side of the door, and provided with a first vent for communicating with the upper cable chamber.
It is provided in the box body and is located above the upper electric system, and is configured to close the first opening communicating with the upper cable chamber and open the first opening when the pressure of the upper cable chamber rises. An upper wall provided with a first flapper and a second vent that communicates with the upper cable chamber.
Provided in the box body, the upper circuit breaker room, the upper cable room, the upper bus room, the lower circuit breaker room, the lower cable room, and the lower bus room are partitioned, and the upper cable room and the lower bus bar are cut off. A second flapper configured to close the second opening that communicates with the instrument chamber and open the second opening when the pressure of the lower circuit breaker chamber rises, and the upper cable chamber and the lower cable chamber. A third flapper configured to close the third opening for communicating with the lower cable chamber and open the third opening when the pressure of the lower cable chamber rises, and a third flapper for communicating the upper cable chamber and the lower bus chamber. A partition wall provided with a fourth flapper configured to close the opening of 4 and open the 4th opening when the pressure of the lower bus chamber rises .
A metal closure type switch gear equipped with. The metal closing type switch gear according to claim 1, further comprising a first closing member provided in the upper cable chamber and configured to close the first vent when the pressure in the upper cable chamber rises. The metal closing type switch gear according to claim 1 or 2, wherein the second flapper , the third flapper, and the fourth flapper are configured to open toward the upper cable chamber. Has a second closing member
The third opening opens toward the upper wall and
The partition wall is provided with a third vent for communicating the lower cable chamber and the upper cable chamber.
The second closing member is configured to close the third vent when the pressure in the lower cable chamber rises.
A metal closed type switch gear according to any one of claims 1 to 3. The metal closing type switch gear according to claim 4, wherein the second closing member is configured to open the third vent when the pressure in the upper cable chamber rises.

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