Switchgear

Abstract

In the switchgear (100), a main circuit chamber (1) and a cable chamber (2) are provided in a housing (9) while being partitioned from each other. A first pressure relief plate (1D) is provided to cover a first opening (1H) provided in a first wall surface (1W) that separates the main circuit chamber (1) and the duct (6), and a second pressure relief plate (2D) is provided to cover a second opening (2H) provided in a second wall surface (2W) that separates the cable chamber (2) and the duct (6). The first pressure relief plate (1D) is configured to communicate the main circuit chamber (1) and the duct (6) with each other due to a pressure increase in the main circuit chamber. The first opening (1H) is provided between the discharge port (6H) in the duct (6) and the second opening (2H), and the first pressure relief plate (1D) constitutes a blocking portion (50) that blocks the passage of the duct (6) in response to a pressure increase in the main circuit chamber (1).

Description

[Technical field]

[0001] The present application relates to a switchgear. [Background technology]

[0002] Switchgear, which serves as a switching device that distributes high-voltage electricity received from electric power companies to each load using circuit breakers, generally contains the main circuit section that cuts off the high-voltage current, the cable connection section connected to the terminals of this main circuit section, the control section that performs control, the drive section that drives the circuit breakers in the main circuit, and the busbar section connected to the main circuit section, all in separate compartments separated by partitions. Among these, gas-insulated switchgear houses the main circuit section to which high voltage is applied in an airtight container, and seals SF6 gas, which has excellent insulating properties, in this container, thereby making the layout of the main circuit equipment such as circuit breakers more compact. In recent years, environmentally friendly gases such as dry air may be used instead of SF6 gas.

[0003] In such gas-insulated switchgear, when a malfunction such as a short circuit occurs in the sealed container in which the main circuit section is housed, or in the cable room in which the cable connection section is housed, the energy generated by the malfunction causes a large pressure rise in the main circuit room and the cable room. For this reason, a gas-insulated switchgear as a conventional switchgear having the following configuration has been disclosed, which is provided with a pressure relief duct that controls the gas release direction and path to release the increased pressure of the gas to the outside. That is, in a conventional gas-insulated switchgear, a flapper is provided at the top of the pressure relief duct in the cable room to release the pressure rise caused by the internal arc to the pressure relief duct side. Also, a flapper is provided in the main circuit room to release the pressure rise caused by the internal arc to the pressure relief duct side. Each of the pressure rises is structured to be released to the outside through the pressure relief duct (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. WO2020 / 100183 Summary of the Invention [Problem to be solved by the invention]

[0005] In the gas-insulated switchgear as the conventional switchgear, the main circuit room and the cable room share a pressure relief duct. In this case, when a short circuit or the like occurs in the main circuit, if the first arc energy released to the pressure relief duct through the pressure relief plate of the main circuit room becomes larger than the second arc energy released through the pressure relief plate of the cable room when a short circuit or the like occurs in the main circuit, the effect of pressure relief from the main circuit room will extend to the cable room unless the pressure relief plate on the cable room side is designed to withstand the first arc energy. Therefore, if the strength (rigidity) of the pressure relief plate on the cable room side is increased in consideration of the first arc energy, there is a problem that the pressure relief plate on the cable room side does not operate to release pressure when the relatively small second arc energy is released. In such a case, the cable room has a sealed structure, and the pressure rise inside the cable room due to the second arc energy becomes larger than the pressure rise when the pressure relief plate operates, so it is necessary to design the strength of the cable room to be high. However, increasing the strength of the cable room causes problems such as increased cost and weight.

[0006] The present application discloses technology for solving the above-mentioned problems, and aims to provide a low-cost, light-weight switchgear that can reduce the impact on the cable room side of pressure relief from the main circuit room while ensuring pressure relief operation on the cable room side. [Means for solving the problem]

[0007] The switchgear disclosed in the present application comprises: A switchgear in which a main circuit chamber for accommodating a main circuit device and a cable chamber for accommodating a cable for supplying power to the main circuit device are provided in a housing and partitioned from each other, and a duct is provided for releasing pressure in the main circuit chamber and the cable chamber to the outside of the housing via a release port, a first pressure relief plate covering a first opening provided in a first wall surface separating the main circuit chamber and the duct; and a second pressure relief plate covering a second opening provided in a second wall surface separating the cable chamber and the duct. the first pressure relief plate is configured to open the first opening due to a pressure increase in the main circuit chamber to communicate between the main circuit chamber and the duct, and the second pressure relief plate is configured to open the second opening due to a pressure increase in the cable chamber to communicate between the cable chamber and the duct, The first opening is provided between the outlet and the second opening in the duct, The first pressure relief plate constitutes a blocking portion that blocks the passage of the duct between the first opening and the second opening in the duct when the first opening is open. death, a partition plate having a through hole formed therein is provided between the first opening and the second opening in the duct; When the first opening of the first pressure release plate is opened, the first pressure release plate with the first opening open overlaps the partition plate to close the through hole and form the blocking portion. It is something. Further, the switchgear disclosed in the present application is A switchgear in which a main circuit chamber for accommodating a main circuit device and a cable chamber for accommodating a cable for supplying power to the main circuit device are provided in a housing and partitioned from each other, and a duct is provided for releasing pressure in the main circuit chamber and the cable chamber to the outside of the housing via a release port, a first pressure relief plate covering a first opening provided in a first wall surface separating the main circuit chamber and the duct; and a second pressure relief plate covering a second opening provided in a second wall surface separating the cable chamber and the duct. the first pressure relief plate is configured to open the first opening due to a pressure increase in the main circuit chamber to communicate between the main circuit chamber and the duct, and the second pressure relief plate is configured to open the second opening due to a pressure increase in the cable chamber to communicate between the cable chamber and the duct, The first opening is provided between the outlet and the second opening in the duct, the first pressure relief plate constitutes a blocking portion that blocks a passage of the duct between the first opening and the second opening in the duct when the first opening is open, The first pressure relief plate has a creeping portion extending along the inner wall surface of the duct at an edge portion of the first pressure relief plate to constitute the blocking portion. It is something. Further, the switchgear disclosed in the present application is A switchgear in which a main circuit chamber for accommodating a main circuit device and a cable chamber for accommodating a cable for supplying power to the main circuit device are provided in a housing and partitioned from each other, and a duct is provided for releasing pressure in the main circuit chamber and the cable chamber to the outside of the housing via a release port, a first pressure relief plate covering a first opening provided in a first wall surface separating the main circuit chamber and the duct; and a second pressure relief plate covering a second opening provided in a second wall surface separating the cable chamber and the duct. the first pressure relief plate is configured to open the first opening due to a pressure increase in the main circuit chamber to communicate between the main circuit chamber and the duct, and the second pressure relief plate is configured to open the second opening due to a pressure increase in the cable chamber to communicate between the cable chamber and the duct, The first opening is provided between the outlet and the second opening in the duct, the first pressure relief plate constitutes a blocking portion that blocks a passage of the duct between the first opening and the second opening in the duct when the first opening is open, The first pressure relief plate has a claw portion bent from the inner wall surface of the duct at an edge portion of the first pressure relief plate to form the blocking portion. It is something. Effect of the Invention

[0008] The switchgear disclosed in the present application provides a low-cost, light-weight switchgear that can reduce the impact on the cable chamber side of pressure relief from the main circuit chamber while ensuring pressure relief operation on the cable chamber side. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic configuration of a switchgear according to a first embodiment. [Diagram 2] FIG. 2 is a partial enlarged view of the switchgear according to the first embodiment. [Diagram 3] 4 is a conceptual diagram showing a route along which hot air caused by a pressure rise in a main circuit chamber is released in accordance with the first embodiment. FIG. [Figure 4] 4 is a perspective view showing an example of the shape of a pressure relief plate on the main circuit chamber side in the first embodiment. FIG. [Diagram 5] 4 is a perspective view showing an example of the shape of a pressure relief plate on the main circuit chamber side in the first embodiment. FIG. [Figure 6] 5 is a cross-sectional view showing an example of the shape of a pressure relief plate on the main circuit chamber side in the first embodiment. FIG. [Figure 7] FIG. 11 is a cross-sectional view showing a schematic configuration of a switchgear according to a second embodiment. [Figure 8] FIG. 11 is a partially enlarged cross-sectional view of a switchgear according to a second embodiment. [Figure 9] 11 is a conceptual diagram showing a route along which hot air caused by a pressure rise in a main circuit chamber is released in accordance with the second embodiment. FIG. [Figure 10] 11 is a conceptual diagram showing a path along which hot air caused by a pressure rise in a cable room according to the second embodiment is released. FIG. [Figure 11] FIG. 11 is a cross-sectional view showing an example of the shape of a pressure relief plate on the main circuit chamber side in the second embodiment. [Figure 12] 11 is a cross-sectional view showing an example of the shape of a partition plate in the second embodiment. FIG. [Figure 13]FIG. 11 is a cross-sectional view showing an example of the shape of a pressure relief plate on the main circuit chamber side in the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Embodiment 1 Hereinafter, the switchgear 100 of this embodiment will be described with reference to the drawings. In addition, the same reference numerals in each drawing indicate the same or corresponding parts. FIG. 1 is a cross-sectional view showing a schematic configuration of a switchgear 100 according to a first embodiment. FIG. 2 is an enlarged view of a portion A of the switchgear 100 shown in FIG. In the drawings, the width direction, depth direction, and height direction of the switchgear 100 are indicated by arrows X, Z, and Y, respectively. Since the left side in Fig. 1 and Fig. 2 is the front side of the switchgear 100 and the right side is the rear side, the left-right direction in Fig. 1 and Fig. 2 is the depth direction Z of the switchgear 100.

[0011] The switchgear 100 as a switching device in this embodiment mainly transmits, receives, distributes, and cuts off electric power, and in particular has a duct structure for venting to the outside hot air generated by a sudden increase in pressure and temperature due to arc energy when a malfunction such as a short circuit occurs inside the device. As shown in FIG. 1, the switchgear 100 has a housing 9 inside which is divided into multiple compartments, with a main circuit room 1, a cable room 2, a busbar room 3, a low voltage control room 4, a mechanism room 5, and a pressure relief duct 6 housed in each compartment.

[0012] The main circuit room 1 is an airtight container filled with insulating gas, and houses circuit breakers and disconnectors (not shown) which serve as main circuit equipment that constitutes the main circuit and interrupt and disconnect high currents. Below the main circuit chamber 1 in the height direction Y, there is disposed a cable chamber 2 which houses a cable 2K which is connected via a bushing 2B to one end of a conductor portion constituting the main circuit. A busbar chamber 3 housing a busbar 3M is disposed above the main circuit chamber 1 in the height direction Y. The other end of the conductor portion (not shown) constituting the main circuit is connected to the busbar 3M via a bushing 3B in the busbar chamber 3.

[0013] In the compartments on the rear side in the depth direction Z of the main circuit room 1, the cable room 2, and the bus bar room 3, a pressure relief duct 6 is disposed as a duct. A pressure release port 1H serving as a first opening is formed in a first wall surface 1W that separates the main circuit chamber 1 from the pressure release duct 6. A pressure release plate 1D serving as a first pressure release plate that covers the pressure release port 1H is provided.

[0014] 2, the pressure release plate 1D is supported by a support portion 1R at its lower part in the height direction Y. When the pressure inside the main circuit chamber 1 rises, the pressure release plate 1D rotates around the support portion 1R in response to the pressure rise from the position of the pressure release plate 1D shown by the dotted line in the direction of the dotted arrow P, i.e., toward the rear side of the switchgear 100, to the position of the pressure release plate 1D shown by the solid line, and moves away from the pressure release port 1H, opening the pressure release port 1H. This brings the main circuit chamber 1 and the pressure release duct 6 into communication with each other. The pressure relief plate 1D is configured to have a length such that its edge portion reaches an inner wall surface 6in inside the pressure relief duct 6. In addition, the support portion 1R is configured to be rotatable by fastening with bolts or the like.

[0015] 1, a pressure relief port 2H serving as a second opening is formed in a second wall surface 2W separating the cable room 2 from the pressure relief duct 6. A pressure relief plate 2D serving as a second pressure relief plate is provided to cover the pressure relief port 2H. Although not shown, like the pressure relief plate 1D, this pressure relief plate 2D also moves away from the pressure relief port 2H in response to a pressure increase in the cable chamber 2, thereby opening the pressure relief port 2H. This allows the cable chamber 2 and the pressure relief duct 6 to communicate with each other.

[0016] Provided at the upper part of the pressure relief duct 6 in the height direction Y are a discharge port 6H that opens to the outside and a discharge plate 6D that closes this discharge port 6H, and the discharge plate 6D operates to open the discharge port 6H in response to an increase in pressure inside the pressure relief duct 6. Note that during normal times when no fault such as a ground fault occurs, the inside of the pressure relief duct 6 is made into a closed space by this discharge plate 6D.

[0017] As shown in Figure 1, the position of the pressure relief port 1H that connects the main circuit room 1 to the pressure relief duct 6 is between the discharge port 6H and the pressure relief port 2H of the cable room 2, and the pressure relief port 1H is located above the pressure relief port 2H in the height direction Y.

[0018] Although the pressure relief duct 6 shown in Figure 1 extends to the ground surface E, if the pressure relief plate 1D of the main circuit room 1 and the pressure relief plate 2D of the cable room 2 are contained inside the pressure relief duct 6, the pressure relief duct 6 does not need to extend to the ground surface E.

[0019] A case where a malfunction such as a ground fault occurs in the switchgear 100 configured as above will be described. FIG. 3 is a conceptual diagram showing the route along which hot air caused by a pressure increase inside the main circuit chamber 1 is discharged. For example, when a ground fault or the like occurs in the main circuit and pressure rises in the main circuit chamber 1, the pressure relief plate 1D moves away from the pressure relief port 1H to open the pressure relief port 1H, thereby connecting the main circuit chamber 1 and the pressure relief duct 6. As described above, the pressure release plate 1D is configured to have a length such that its edge portion reaches the inner wall surface 6in of the pressure release duct 6, so the pressure release plate 1D blocks the passage between the pressure release port 1H and the discharge port 2H in the pressure release duct 6. The portion of the pressure release duct 6 between the pressure release port 1H and the discharge port 2H that uses the pressure release plate 1D to block the passage in this manner is referred to as a blocking portion 50.

[0020] In this way, the pressure increase in the main circuit chamber 1 flows into the pressure relief duct 6. Then, in response to the pressure increase in the pressure relief duct 6, the discharge plate 6D opens the discharge port 6H, and hot air is discharged to the outside of the housing 9 through the discharge port 6H. At this time, since a blocking portion 50 is configured to block the space between the pressure release port 1H and the discharge port 2H in the pressure release duct 6, hot air does not flow into the cable room 2 below through the pressure release duct 6.

[0021] Hereinafter, a description will be given of the configuration of the pressure relief plate 1D1 covering the pressure relief port 1H of the main circuit chamber 1, which is different from the configuration shown in FIG. The shape of the pressure relief duct 6 will be described assuming that the cross section perpendicular to the height direction Y has a rectangular shape. FIG. 4 is a perspective view showing an example of the shape of the pressure release plate 1D1 in the first embodiment. FIG. 5 is a perspective view showing an example of the shape of the pressure release plate 1D2 in the first embodiment. FIG. 6 is a cross-sectional view showing an example of the shape of the pressure release plate 1D3 in the first embodiment.

[0022] 4 has a creeping surface portion 1S at its end portion, which extends in the height direction Y along the inner wall surface 6in of the pressure relief duct 6. In this embodiment, the creeping surface portion 1S is configured to have the same width as the width X1 of the pressure relief duct 6 in the width direction X. With this configuration, it is possible to prevent the occurrence of a gap between the inner wall surface 6in of the pressure relief duct 6 and the pressure relief plate 1D1, thereby preventing the influence of the pressure relief from the main circuit chamber 1 from extending to the cable chamber 2. Furthermore, it is possible to prevent the pressure relief plate 1D1 from being pushed downward by the pressure relief from the main circuit chamber 1, thereby forming a blocking section 50 with high sealing functionality.

[0023] Moreover, the pressure relief plate 1D2 shown in FIG. This allows the blocking portion 50 to have even higher sealing performance.

[0024] In addition, the pressure relief plate 1D3 shown in Figure 6 has a claw portion 1N at its edge that is configured to be bent from the inner wall surface 6in of the pressure relief duct 6 to a position that meets the inner wall surface 6in of the pressure relief duct 6 when the pressure relief port 1H is opened. When the pressure relief plate 1D3 rotates to open the pressure relief port 1H, the claw portion 1N comes into contact with the inner wall surface 6in of the pressure relief duct 6, thereby restricting the movement of the pressure relief plate 1D3 and forming a blocking portion 50 that blocks the inside of the pressure relief duct 6. 5 may be provided on both sides in the width direction X. In this case, it is also possible to cover the entire cross section of the pressure relief duct 6 over a wider range, thereby forming a blocking portion 50 with high sealing performance.

[0025] The switchgear of the present embodiment configured as described above has: A switchgear in which a main circuit chamber for accommodating a main circuit device and a cable chamber for accommodating a cable for supplying power to the main circuit device are provided in a housing and partitioned from each other, and a duct is provided for releasing pressure in the main circuit chamber and the cable chamber to the outside of the housing via a release port, a first pressure relief plate covering a first opening provided in a first wall surface separating the main circuit chamber and the duct; and a second pressure relief plate covering a second opening provided in a second wall surface separating the cable chamber and the duct. the first pressure relief plate is configured to open the first opening due to a pressure increase in the main circuit chamber to communicate between the main circuit chamber and the duct, and the second pressure relief plate is configured to open the second opening due to a pressure increase in the cable chamber to communicate between the cable chamber and the duct, The first opening is provided between the outlet and the second opening in the duct, The first pressure relief plate constitutes a blocking portion that blocks a passage of the duct between the first opening and the second opening in the duct when the first opening is opened. It is something.

[0026] In this manner, the first pressure release plate constitutes a blocking portion that blocks the passage between the first opening and the second opening in the duct when the first wall surface is open. By configuring the blocking section in this manner, when the pressure in the main circuit room is relieved, the main circuit room side and the cable room side of the pressure relief duct become independent compartments, so that the effect of the pressure relief in the main circuit room does not reach the cable room. In addition, even if the arc energy released from the main circuit room 1 when a malfunction such as a short circuit occurs in the main circuit room 1 is greater than the arc energy released from the cable room 2 when a malfunction such as a short circuit occurs in the main circuit room 1, the strength of the pressure relief plate 2D of the cable room 2 can be reduced so that it can be operated with a relatively small arc energy on the cable room 2 side. Therefore, even if a relatively small arc energy occurs in the cable room, the pressure relief plate on the cable room side operates to release the pressure, so that the pressure rise when the cable room is sealed can be suppressed. This makes it possible to realize a design with a reduced strength of the cable room itself, which is expected to reduce costs and weight. In this way, it is possible to provide a low-cost, light-weight switchgear that can reduce the effect on the cable chamber side of pressure relief from the main circuit chamber while ensuring pressure relief operation on the cable chamber side.

[0027] Furthermore, if the pressure relief plate 1D in the main circuit chamber 1 is installed so as to limit the opening angle thereof, i.e. so that the angle θ from the first wall surface 1W shown in Fig. 2 is within 90 degrees, the hot air released from the main circuit chamber 1 can be guided to the upper part of the pressure relief duct 6. The opening angle of the pressure relief plate 1D may be adjusted, for example, by adjusting the rotation angle of the support portion 1R, or by adjusting the length of the pressure relief plate 1D in the depth direction Z.

[0028] In the above, the discharge port 6H is provided above the pressure relief duct 6, and the pressure relief port 2H of the cable room 2 is provided below the pressure relief duct 6, and an example is shown in which the positional relationship between the discharge port 6H of the pressure relief duct 6 and the pressure relief port 2H of the cable room 2 is vertical, but this is not limited to this. Even if the positional relationship between the discharge port 6H of the pressure relief duct 6 and the pressure relief port 2H of the cable room 2 is approximately the same in the horizontal direction, if the blocking portion 50 formed by the pressure relief plate 1D of the main circuit room 1 is provided between the discharge port 6H of the pressure relief duct 6 and the pressure relief port 2H of the cable room 2, and further between the pressure relief port 1H and the pressure relief port 2H of the main circuit room 1, the impact on the cable room side due to the release of pressure from the main circuit room can be reduced.

[0029] Embodiment 2 Hereinafter, the second embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment. The same parts as those in the first embodiment will be given the same reference numerals and the description thereof will be omitted. FIG. 7 is a cross-sectional view showing a schematic configuration of a switchgear 200 according to the second embodiment. FIG. 8 is a partially enlarged cross-sectional view of the switchgear 200 shown in FIG. FIG. 9 is a conceptual diagram showing the route along which hot air caused by a pressure rise in the main circuit chamber 1 is discharged. In the switch gear 200 of the present embodiment, a half partition plate 30 serving as a partition plate is provided between the discharge port 6H of the pressure relief duct 6 and the pressure relief port 2H of the cable room 2 and below the pressure relief port 1H of the main circuit room 1.

[0030] The half partition plate 30 is fixed to the inner wall surface 6in of the pressure relief duct 6 by bolting, welding, or the like. As shown in Fig. 8, the half partition plate 30 has at least one through hole 3H formed therein. As a result, the inside of the pressure relief duct 6 is not divided into a main circuit chamber 1 side and a cable chamber 2 side by the half partition plate 30 alone.

[0031] When a pressure rise occurs in the main circuit chamber 1 and the pressure release plate 1D opens the pressure release port 1H in response to this pressure rise, the pressure release plate 1D overlaps with the half partition plate 30. As a result, the through hole 3H of the half partition plate 30 is blocked by the pressure release plate 1D, and a blocking portion 50 that blocks the passage of the pressure release duct 6 is formed. Therefore, as shown in Figure 9, even if a malfunction such as a ground fault occurs in the main circuit room 1, the flow of hot air from the main circuit room 1 is limited to flowing upward from the semi-partition plate 30, and does not affect the cable room 2 side. The diameter of the through hole 3H is not particularly limited as long as it can be closed by the pressure relief plate 1D.

[0032] On the other hand, when a pressure rise occurs in the cable room 2 and the pressure relief plate 2D opens the pressure relief port 2H in response to this pressure rise, hot air flows to the upper side of the pressure relief duct 6 via the through hole 3H of the half partition plate 30 as shown in Fig. 10. In this way, the flow of hot air from the cable room 2 is not obstructed. In this way, the same effect as in the first embodiment is achieved, and the impact on the cable room 2 side of the pressure relief from the main circuit room 1 can be reduced while ensuring the pressure relief operation on the cable room 2 side. In addition, since the blocking portion 50 is composed of the pressure relief plate 1D and the half partition plate 30, the strength of the pressure relief plate 1D can be reduced. Therefore, even if a relatively small amount of arc energy occurs in the main circuit chamber, the pressure relief plate 1D operates to release pressure. Therefore, a pressure rise in the main circuit chamber due to a relatively small amount of arc energy can be suppressed.

[0033] Other shapes of the pressure relief plate 1D will be described below. FIG. 11 is a cross-sectional view showing an example of the shape of a pressure release plate 1D4 in the second embodiment. The pressure relief plate 1D is provided with a protrusion 1DT on the surface side facing the half partition plate 30. This protrusion 1DT is provided at a position where it fits into the through hole 3H of the half partition plate 30 when the pressure relief plate 1D rotates around the support portion 1R. In this way, the protrusion 1DT fits into the through hole 3H to close the through hole 3H, thereby forming a metal seal structure, and further, a blocking portion 50 with high sealing functionality can be formed. If the diameter of the through hole 3H of the half partition plate 30 is made smaller than the diameter of the protruding portion 1DT by a set dimension, higher airtightness can be ensured.

[0034] An example of another shape of the half partition plate 30 will be described below. FIG. 12 is a perspective view showing an example of the shape of the half partition plate 30A in the second embodiment. A cylindrical portion 1DC made of a member capable of being deformed by an external force is provided along the peripheral edge of the through hole 3H of the half partition plate 30A and stands from the half partition plate 30A. This cylindrical portion 1DC is deformed by an external force caused by contact of the pressure release plate 1D that moves away from the pressure release port 1H to open the pressure release port 1H, thereby blocking the through hole 3H and forming the blocking portion 50. If the strength of the cylindrical portion 1DC is adjusted so that it deforms reliably in consideration of the weight of the pressure release plate 1D, etc., a blocking portion 50 with higher sealing performance can be formed. If the cylindrical portion 1DC is made of a ductile material such as a metal member, the cylindrical portion 1DC will plastically deform due to an external force caused by contact with the pressure relief plate 1D and close the through hole 3H, improving the sealing performance. After the cylindrical portion 1DC is plastically deformed, the switchgear is temporarily taken out of service and each component part is replaced. 4, a creeping portion extending in the height direction Y along the inner wall surface 6in of the pressure relief duct 6 may be formed at the end of the half partition plate 30. In this case as well, it is possible to cover the entire cross section of the pressure relief duct 6 over a wider range, thereby forming a blocking portion 50 with high sealing performance.

[0035] An example of another shape of the pressure relief plate 1D will be described below. FIG. 13 is a perspective view showing an example of the shape of the pressure release plate 1D5 in the second embodiment. The pressure relief plate 1D is configured such that its lower portion in the height direction Y is not supported by the support portion 1R. As a result, when pressure is relieved in the main circuit chamber 1, the pressure relief plate 1D separates from the main circuit chamber 1 toward the half partition plate 30 due to the load caused by the pressure. The separated pressure relief plate 1D overlaps with the half partition plate 30, and the through hole 3H of the half partition plate 30 is blocked by the pressure relief plate 1D. In this way, a blocking portion 50 that blocks the passage of the pressure relief duct 6 is formed. In this way, the same effects as in the first embodiment can be achieved, and the effect on the cable room 2 side caused by the release of pressure from the main circuit room 1 can be reduced while ensuring the pressure release operation on the cable room 2 side.

[0036] In the above, a gas-insulated switchgear in which the main circuit section is housed in a sealed container filled with SF6 gas, which has excellent insulating properties, has been used as an example. However, the present invention is not limited to this and can also be applied to an air-insulated switchgear in which the main circuit section is housed in a partitioned area in the atmosphere. Also, a configuration may be adopted in which any one of the pressure relief plates 1D, 1D1, 1D2, and 1D3 shown in the first embodiment is provided together with the half partition plate 30 of the second embodiment.

[0037] Although the present application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in this application, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment. [Explanation of symbols]

[0038] 1 main circuit room, 2 cable room, 1H pressure relief port (first opening), 2H pressure relief port (second opening), 3H hole (through hole), 1W first wall, 2W second wall, 1D, 1D1, 1D2, 1D3, 1D4, 1D5 pressure relief plate (first pressure relief plate), 2D pressure relief plate (second pressure relief plate), 6 pressure relief duct, 6H discharge port, 9 housing, 30, 30A partition plate, 1S creeping portion, 1N claw portion, 1DT protrusion, 100, 200 switchgear.

Claims

1. A switchgear in which a main circuit chamber for accommodating a main circuit device and a cable chamber for accommodating a cable for supplying power to the main circuit device are provided in a housing and partitioned from each other, and a duct is provided for releasing pressure in the main circuit chamber and the cable chamber to the outside of the housing via a release port, a first pressure relief plate covering a first opening provided in a first wall surface separating the main circuit chamber and the duct; and a second pressure relief plate covering a second opening provided in a second wall surface separating the cable chamber and the duct. the first pressure relief plate is configured to open the first opening due to a pressure increase in the main circuit chamber to communicate between the main circuit chamber and the duct, and the second pressure relief plate is configured to open the second opening due to a pressure increase in the cable chamber to communicate between the cable chamber and the duct, The first opening is provided between the outlet and the second opening in the duct, The first pressure relief plate constitutes a blocking portion that blocks a passage of the duct between the first opening and the second opening in the duct when the first opening is opened, a partition plate having a through hole formed therein is provided between the first opening and the second opening in the duct; When the first opening of the first pressure release plate is opened, the first pressure release plate with the first opening open overlaps the partition plate to close the through hole and form the blocking portion. Switchgear.

2. The first pressure relief plate is a protrusion that fits into the through hole of the partition plate when the first opening is open to close the through hole, the protrusion constituting the closing portion; The switchgear according to claim 1.

3. The through hole is configured so that the diameter of the through hole is smaller than the diameter of the protrusion by a set dimension. The switchgear according to claim 2.

4. a cylindrical portion that is deformable by stress and that rises from the partition plate along a peripheral portion of the through hole of the partition plate is provided in the through hole of the partition plate, the cylindrical portion is deformed by stress caused by contact of the first plate when the first opening is opened, and closes the through hole to form the closing portion. The switchgear according to claim 1.

5. The first pressure relief plate has an end portion rotatably supported by a support portion at an edge portion of the first opening, The partition plate is the first pressure release plate is provided at a position between the first opening and the second opening, and at a position where the first pressure release plate can overlap the partition plate to close the through hole when the first opening is opened and the first pressure release plate rotates about the support portion as a fulcrum. The switchgear according to claim 1.

6. The first pressure relief plate has an end portion rotatably supported by a support portion at an edge portion of the first opening, The partition plate is the first pressure release plate is provided at a position between the first opening and the second opening, and at a position where the first pressure release plate can overlap the partition plate to close the through hole when the first opening is opened and the first pressure release plate rotates about the support portion as a fulcrum. The switchgear according to claim 2.

7. The first pressure relief plate has an end portion rotatably supported by a support portion at an edge portion of the first opening, The partition plate is the first pressure release plate is provided at a position between the first opening and the second opening, and at a position where the first pressure release plate can overlap the partition plate to close the through hole when the first opening is opened and the first pressure release plate rotates about the support portion as a fulcrum. The switchgear according to claim 3.

8. The first pressure relief plate has an end portion rotatably supported by a support portion at an edge portion of the first opening, The partition plate is the first pressure release plate is provided at a position between the first opening and the second opening, and at a position where the first pressure release plate can overlap the partition plate to close the through hole when the first opening is opened and the first pressure release plate rotates about the support portion as a fulcrum. The switchgear according to claim 4.

9. The first pressure relief plate has a creeping portion extending along the inner wall surface of the duct at an edge portion of the first pressure relief plate, and constitutes the blocking portion. The switchgear according to any one of claims 1 to 8.

10. The first pressure relief plate has a claw portion bent from the inner wall surface of the duct at an edge portion of the first pressure relief plate to form the blocking portion. The switchgear according to any one of claims 1 to 8.

11. The first pressure relief plate has a length such that an edge portion of the first pressure relief plate reaches an inner wall surface of the duct, and constitutes the blocking portion. The switchgear according to any one of claims 1 to 8.

12. A switchgear in which a main circuit chamber for accommodating a main circuit device and a cable chamber for accommodating a cable for supplying power to the main circuit device are provided in a housing and partitioned from each other, and a duct is provided for releasing pressure in the main circuit chamber and the cable chamber to the outside of the housing via a release port, a first pressure relief plate covering a first opening provided in a first wall surface separating the main circuit chamber and the duct; and a second pressure relief plate covering a second opening provided in a second wall surface separating the cable chamber and the duct. the first pressure relief plate is configured to open the first opening due to a pressure increase in the main circuit chamber to communicate between the main circuit chamber and the duct, and the second pressure relief plate is configured to open the second opening due to a pressure increase in the cable chamber to communicate between the cable chamber and the duct, The first opening is provided between the outlet and the second opening in the duct, The first pressure relief plate constitutes a blocking portion that blocks a passage of the duct between the first opening and the second opening in the duct when the first opening is opened, The first pressure relief plate has a creeping portion extending along the inner wall surface of the duct at an edge portion of the first pressure relief plate, and constitutes the blocking portion. Switchgear.

13. A switchgear in which a main circuit chamber for accommodating a main circuit device and a cable chamber for accommodating a cable for supplying power to the main circuit device are provided in a housing and partitioned from each other, and a duct is provided for releasing pressure in the main circuit chamber and the cable chamber to the outside of the housing via a release port, a first pressure relief plate covering a first opening provided in a first wall surface separating the main circuit chamber and the duct; and a second pressure relief plate covering a second opening provided in a second wall surface separating the cable chamber and the duct. the first pressure relief plate is configured to open the first opening due to a pressure increase in the main circuit chamber to communicate between the main circuit chamber and the duct, and the second pressure relief plate is configured to open the second opening due to a pressure increase in the cable chamber to communicate between the cable chamber and the duct, The first opening is provided between the outlet and the second opening in the duct, The first pressure relief plate constitutes a blocking portion that blocks a passage of the duct between the first opening and the second opening in the duct when the first opening is opened, The first pressure relief plate has a claw portion bent from the inner wall surface of the duct at an edge portion of the first pressure relief plate to form the blocking portion. Switchgear.

14. The first pressure relief plate has a length such that an edge portion of the first pressure relief plate reaches an inner wall surface of the duct, and constitutes the blocking portion. The switchgear according to claim 12 or 13.

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