Switch

Abstract

This invention provides a concept applicable to storage containers in general, and using the concept, provides a small-sized switch at a low cost. This switch has a pressure container provided with an electric contact inside, and has a storage container for storing the pressure container, the storage container being formed so as to cover the pressure container.

Description

Switchgear

[0001] The present invention relates to a switching device.

[0002] Switchgears are widely used to turn on and off electric power in the process of transmitting electric power from an electric power company to various devices that use the electric power. Patent Document 1 discloses an example of a switchgear.

[0003] Japanese Patent Application Laid-Open No. 2006-352972

[0004] The switchgear described in Patent Document 1 has an exposed switchgear body and an outer shape with many irregularities. For the sake of improving the appearance and for safety reasons of preventing inadvertent access by people, it has been required to provide a containment vessel corresponding to a part or a portion of the exposed switchgear body.

[0005] Therefore, an object of the present application is to provide a general-purpose concept for a containment vessel and, by using the concept, to provide a low-cost, small-sized switchgear.

[0006] An example of the safety work device of the present invention for solving the above problems is as follows.

[0007] A switchgear having a pressure vessel with an electrical contact provided therein and a containment vessel for containing the pressure vessel, wherein the containment vessel is formed to cover the pressure vessel.

[0008] According to the present invention, a versatile concept for a containment vessel can be provided, and by using the containment vessel, a low-cost, small-sized switchgear can be realized.

[0009] Further configurations and effects of the present invention will become apparent from the entire specification below.

[0010] FIG. 1 is a schematic side perspective view of an example of a switchgear of the present invention. FIG. 2 is a schematic side view of a switchgear of the present invention. FIG. 3 is a schematic back view of a switchgear of the present invention. FIG. 4 is a schematic front view of a switchgear of the present invention. FIG. 5 is a schematic top perspective view of a switchgear of the present invention. FIG. 6 is a schematic top view of a switchgear of the present invention. FIG. 7 is a schematic bottom view of a switchgear of the present invention. FIG. 8 is a schematic side perspective view of an example of a switchgear of the present invention. FIG. 9 is a schematic side perspective view of an example of a switchgear of the present invention. FIG. 10 is a schematic side perspective view of an example of a switchgear of the present invention. FIG. 11 is a schematic side perspective view of an example of a switchgear of the present invention. FIG. 12 is a schematic diagram explaining the configuration of a containment vessel of an example of a switchgear of the present invention. FIG. 13 is a schematic side view of an example of a switchgear of the present invention. FIG. 14 is a schematic side perspective view of an example of a switchgear of the present invention. FIG. 15 is a schematic top perspective view of an example of a switchgear of the present invention. FIG. 16 is a schematic explanatory view relating to 108 in FIGS. 17 and 18. FIG. 17 is a schematic explanatory view relating to 108 in FIGS. 17 and 18. FIG. 18 is a schematic cross-sectional structural view of an example of a switchgear of the present invention. FIG. 1 is a top view of an example of an opening and closing device of the present invention. FIG. 2 is a side view of an example of an opening and closing device of the present invention. FIG. 3 is a rear view of an example of an opening and closing device of the present invention. FIG. 4 is a front view of an example of an opening and closing device of the present invention. FIG. 5 is an explanatory view of a bottom plate of an example of an opening and closing device of the present invention. FIG. 6 is an explanatory view of a bottom plate of an example of an opening and closing device of the present invention.

[0011] 1 is a schematic side perspective view of an example of a switchgear of the present invention. Reference numeral 110 denotes a tank of the switchgear, 120 denotes a drive device of the switchgear, and 121 denotes a control device of the switchgear. The present invention is characterized in that the tank 110 of the switchgear, the drive device 120 of the switchgear, and the control device 121 of the switchgear are all housed in a single containment vessel 100 to realize the switchgear.

[0012] 2 is a schematic side view of the switchgear of the present invention, showing that the entire device is housed in a containment vessel 100. Reference numeral 130 denotes a connection part to other devices, but whether or not it is provided depends on the switchgear and the external connected devices.

[0013] Fig. 3 is a schematic rear view of the switchgear of the present invention, which corresponds to a view seen from the right side in Fig. 1 or 2. An external connection part 131 is provided in a part of the containment vessel 100, where input wiring and output wiring to the outside are provided, and power is supplied and cut off to the switchgear in the containment vessel 100.

[0014] Fig. 4 is a schematic front view of the opening / closing device of the present invention. It corresponds to the view seen from the left side in Fig. 1 or 2. An opening / closing door 132 is provided in a part of the containment vessel 100. 133 is a doorknob. The opening / closing door 132 is provided because of the need for periodic maintenance of the control equipment 121 and the driving equipment 120 of the opening / closing device.

[0015] 5 is a schematic top perspective view of the opening and closing device of the present invention. The control device 121 includes, for example, a communication device, a calculation device, a controller, etc. By being placed on the side surface of the containment vessel 100, maintenance can be easily performed when the opening and closing door 132 is opened. However, the control device 121 is not limited to being placed on the side surface.

[0016] 6 is a schematic top view of the switchgear of the present invention, showing that the switchgear is integrated by the containment vessel 100.

[0017] The above has described an outline of the switchgear having the containment vessel 100 of the present invention. In the present invention, the tank 110 of the switchgear, the drive equipment 120 of the switchgear, and the control equipment 121 of the switchgear are all housed in one containment vessel 100 to realize the switchgear, thereby improving the appearance and improving safety by preventing inadvertent access by people.

[0018] Furthermore, by incorporating the reactor into a single containment vessel in this manner, it becomes possible to simplify the manufacture of the openable / closable vessel and reduce the cost.

[0019] Here, an example of the configuration of the containment vessel 100 will be described with reference to Fig. 14. Fig. 14 is a schematic diagram illustrating an example of the configuration of a containment vessel in an example of a switchgear of the present invention. It is a schematic diagram of a cross section viewed from above. Reference numeral 105 denotes a first plate, 106 denotes a second plate, and 107 denotes a fastening member. In Fig. 14, a bent portion is provided in the first plate 105, and a part of the second plate 106 is positioned at the bent portion, where the first plate 105 and the second plate 106 are fastened together by the fastening member 107.

[0020] The fastening member 107 can be various types such as rivets, screws, bolts, etc. However, once the containment vessel 100 is made, it is intended to be used permanently, i.e., it is not intended to be disassembled. Therefore, in terms of productivity, it is preferable to use rivets and fasten them by riveting, in terms of assembly efficiency.

[0021] Of course, from the viewpoint of prioritizing ease of disassembly on the premise of recycling, assembly using screws, bolts, etc., or an assembly structure by fitting together by providing a hook portion on one side of the first plate material 105 and a hook portion on the other side of the second plate material 106 may be used. In such cases, the fastening member 107 in the present invention also includes substitution by a fitting structure.

[0022] FIG. 15 is a schematic side view of an example of an opening / closing device of the present invention, and also an example of a schematic side view of a containment vessel 100. For example, the entire containment vessel 100 is ultimately constructed by arranging multiple second plates 106 in a vertical direction. Here, the reason for dividing the containment vessel 100 into separate plates rather than constructing it from a single plate is to improve assembly by keeping the weight of the plates within a certain range. Furthermore, in the example of FIG. 15, multiple second plates 106 with different shapes are used. In this way, by constructing it from multiple plates, it is possible to create containment vessels 100 with appropriate shapes to suit various shapes of opening / closing devices. Reference numeral 108 denotes a plate with a slope for the roof portion. Using such a plate makes it easy to accommodate sloped roofs.

[0023] In FIG. 15, a plurality of second plate members 106 are arranged in parallel in the vertical direction, but a plurality of second plate members 106 may also be arranged in parallel in the horizontal direction, and this case is also within the scope of the disclosure of the present invention.

[0024] 16 is a schematic side perspective view of an example of an opening and closing device of the present invention. There are a plurality of frames 180. The role of these frames 180 will be explained with reference to FIGS. 17 to 19.

[0025] 17 is a schematic top perspective view of an example of a switchgear of the present invention. A support stay 600 is connected to the tank 110 of the switchgear. This support stay 600 serves to connect to and fix the frame 180. Then, by fixing the second plate member 106 to the frame 180, the containment vessel 100 can be easily constructed.

[0026] Here, the fixing of the support stay 600 to the tank 110 will be described. Figure 19 is a schematic explanatory diagram relating to the support stay 600 in Figure 17 or Figure 18. The support stay 600 is fixed to the tank 110 by welding. The reason for using welding here is that the tank 110 may be used with high-pressure gas sealed inside. This is the case when it is used as a so-called gas-insulated switchgear.

[0027] In such cases, machining such as scraping or drilling holes in the tank 110 must be avoided at all costs, as this could lead to the release of high-pressure gas or a decrease in pressure resistance. Therefore, in the present invention, the support stay 600 is fixed to the tank 110 by welding at the welded portion 500, thereby avoiding such concerns and achieving strong fixation.

[0028] The support stay 600 has a downward bent portion, part of which has a hole 109. This hole is used to fix the frame 180 with means such as rivets, screws, bolts, or the like.

[0029] The second plate 106 is fixed to the frame 180 by means of rivets, screws, bolts, or the like, or by means of fitting.

[0030] The advantages of this structure are as follows. First, by connecting the plates using a long frame that exceeds the tank body, the plates themselves do not need to support their own weight, allowing for thinner plates. This contributes to improving environmental performance by reducing the weight of the switchgear and the number of components used. Second, it improves heat dissipation performance. Typically, the tank 110 is made of metal. A metal frame 180 is connected to the tank 110 via a metal support stay 600, to which metal plates are connected, thereby connecting the tank to the plates with metal members. Naturally, the containment vessel 100, which is made of metal plates, has an area, size, and length that are significantly larger than the tank 110. Therefore, heat generated in the tank 110 is transferred to the metal plates through metal-to-metal heat transfer, allowing the heat to be dissipated from the metal plates. In other words, the metal plates function as a giant heat sink.

[0031] Conventionally, heat dissipation from the tank 110 was achieved only by air cooling. However, by adopting this structure, a huge heat sink using heat transfer can be obtained, which can significantly improve cooling performance. Note that when this objective is emphasized, the support stay 600 may be made even larger than the size required for strength. Furthermore, a separate heat transfer member other than the support stay 600 may be provided solely for the purpose of heat transfer.

[0032] Figure 18 is a modification of Figure 17. While the tank 110 in Figure 17 is rectangular, the tank 110 in Figure 18 is circular. Even with such a short rectangular shape, the above structure can be applied as is.

[0033] This embodiment follows the description of embodiment 1. The differences will be explained below.

[0034] FIG. 8 shows a diagram corresponding to FIG. 1 of the first embodiment.

[0035] In this embodiment, in order to improve the cooling performance of the switchgear, air holes are provided in a part of the containment vessel 100. In Fig. 8, air holes 150 are provided above and below on the left side of the drawing. The reason for providing them above and below is to allow natural heat dissipation by air convection.

[0036] 8 also discloses another feature: the ceiling panel 101 has an end that is bent as a hanging portion 102 toward the air hole 150. This prevents rain from entering through the upper air hole 150 during rainy weather, for example, when the unit is installed outdoors.

[0037] Note that the impact of rainwater entering through the lower air vent 150 on the internal equipment is relatively low due to its location. Of course, similar rainwater intrusion measures may be taken for the lower air vent 150. However, even in this case, measures to prevent rainwater intrusion for the upper air vent 150 are far more important.

[0038] This embodiment follows the description of embodiment 2. The differences will be explained below.

[0039] FIG. 9 shows a diagram corresponding to FIG. 8 of the second embodiment.

[0040] In this embodiment, three main features are disclosed.

[0041] First, the ceiling panel 101 is sloped, which allows the rainwater to be directed in a controlled manner and drip away from the air holes 150.

[0042] The second point is that the shape of the containment vessel 100 changes partially along the way. In Figure 9, on the right side, the containment vessel 100 is larger at the bottom than at the top. This is based on the concept of changing the size of the containment vessel 100 to match the shape of the components, such as the tank 110, that will be installed inside. If the containment vessel 100 were made to fit a larger space, the entire containment vessel would be large, resulting in an increase in the amount of components used. Therefore, by expanding the size of the containment vessel 100 only at the bottom of the tank 110, where dimension C is larger due to the presence of the hatch 122, it is possible to realize an integrated containment vessel while minimizing size expansion.

[0043] Such a structure in which the shape changes midway can be easily realized by combining multiple plate materials as described in Example 1. This is also one of the reasons why the inventors of the present invention claim that the structure of the containment vessel connected in this invention is a general-purpose concept.

[0044] The third point is that the second ceiling panel 104 is provided at the part where the shape of the containment vessel changes. This allows rainwater on the ceiling panel 101 to drip onto the second ceiling panel 104 at the bent part 103, and the inclined second ceiling panel 104 allows it to drip to an appropriate location.

[0045] This embodiment follows the description of embodiment 3. The differences are explained below.

[0046] 10 shows a diagram corresponding to FIG. 9 of the third embodiment. The present embodiment is characterized in that a partition wall 160 is provided between the tank 110 and the driving device 120 and between the tank 110 and the driving device 120 and the control device 121.

[0047] This airtightly separates the space into a tank chamber 170 in which the tank is present and a control chamber 171 in which the driving device 120 and the control device 121 are provided.

[0048] Fig. 11 is a schematic top perspective view of Fig. 10. The key point is that a tank chamber 170 and a control chamber 171 are separated by a partition wall 160.

[0049] The reasons and advantages of the separation are explained below.

[0050] The control room 171 is an area that generates a large amount of heat because it is equipped with the driving equipment 120 and the control equipment 121. Therefore, the containment vessel 100 is required to cool this area intensively.

[0051] If the containment vessel is not airtightly separated by the partition wall 160, the entire containment vessel must be cooled. For this reason, even if air cooling is performed using the air holes 150, the volume inside the containment vessel 100 that must be covered by the air holes 150 becomes large, resulting in low cooling efficiency. This means that a large number of air holes 150 are required, which causes other problems such as increased infiltration of rainwater.

[0052] On the other hand, by providing airtight separation using the partition wall 160, the volume inside the containment vessel 100 that should be covered by the air hole 150 can be reduced, improving cooling efficiency and reducing the intrusion of rainwater. Note that this partition wall may be provided by hooking onto or joining to the plate-like body described in detail above. This is because airtightness does not require absolute airtightness. Also, as explained in the first embodiment, a support stay may be joined to the tank 110 and the tank may be installed via this.

[0053] This embodiment follows the description of embodiment 4. The differences will be explained below.

[0054] 12 shows a diagram corresponding to FIG. 10 of the fourth embodiment. The feature of this embodiment is that a heater 190 is provided in the control room 171.

[0055] Because the driving device 120 and the control device 121 have moving parts, semiconductor elements, electrical elements, etc., excessive humidity can shorten their lifespan or cause breakdowns. Therefore, this embodiment is characterized by providing a heater 190 in the control room 171, enabling dehumidification and humidity reduction through heating. The heater 190 does not necessarily need to be operated all the time; a hygrometer may be provided and the heater may be activated according to the reading. Alternatively, a temperature sensor may be provided and the heater may be activated when the temperature is below a set value. This is because, at high temperatures, problems caused by humidity or moisture, such as condensation, are generally less likely to occur due to saturated water vapor pressure.

[0056] Furthermore, by separating the control chamber 171 and the tank chamber 170 with the partition wall 160, the volume of the space that the heater 190 acts on can be limited to only the control chamber 171, and the heater capacity can also be suppressed. This not only reduces costs but also reduces the electricity cost when the heater is operating, leading to an environmentally friendly opening and closing device.

[0057] Figure 13 is a modification of Figure 12. The difference from Figure 12 is that the heater 190 is located at a lower position than the control device 121. Because heat tends to flow upward, installing the heater 190 at a low position makes it possible to effectively heat the entire control room 171 and reduce humidity. In addition, by installing the heater 190 at a lower position than the control device 121, which particularly requires humidity control, it is possible to reliably take humidity control measures for the control device 121.

[0058] In addition, the technical idea of ​​this embodiment can also be expressed in a higher-level concept as making the level of moisture-proofing or humidity control for the control chamber 171 higher than the level of moisture-proofing or humidity control for the tank chamber 170.

[0059] Furthermore, the equipment in the control room 171 is more susceptible to the effects of not only humidity but also water than the equipment in the tank room 170. Therefore, if another technical idea is expressed as a higher-level concept, it can also be expressed as making the level of waterproofing measures for the control room 171 higher than the level of waterproofing measures for the tank room 170. This can be realized by using more or providing more caulking or packing in the control room 171 and less or not providing any in the tank room 170.

[0060] Figure 20 is a view corresponding to Figure 11 of Example 4. While the tank 110 in Figure 11 is rectangular, the tank 110 in Figure 20 is circular. In this case, circular generally means having a curved surface.

[0061] In such a case, the various technical ideas of the first to fifth embodiments can be applied, and the effects described in each embodiment can be achieved.

[0062] In the sixth embodiment, the tank 110 is described as being circular. In this embodiment, the advantages of a circular tank and the configuration and advantages of using the circular tank in a gas-insulated switchgear in particular will be described. Note that the gas-insulated switchgear will be used as an example.

[0063] FIG. 21 is a schematic cross-sectional structural view of an example of a gas-insulated switchgear according to the present invention.

[0064] Reference numeral 10 denotes a bus room and 12 denotes an equipment room. Together, these make up a tank 11. Pressurized dry air is sealed in both the bus room 10 and the equipment room 12. This is an example of an alternative gas to SF6 gas. The alternative gas used is not limited to pressurized dry air, but it is assumed that it does not exhibit ozone layer depletion properties.

[0065] Furthermore, the insulating performance per unit volume of dry air is inferior to that of SF6. To compensate for this, in this embodiment, dry air is pressurized and sealed at a gas pressure of 0.31 MPa. This gas pressure is higher than the gas pressure when SF6 is normally used. This effectively increases the amount of gas per unit volume, thereby compensating for the difference in insulating characteristics due to the change in insulating gas.

[0066] The problem here is that the gas pressure must be increased, or more specifically, it must be increased. This increases the gas pressure on the tank, and a thicker, heavier tank is required to withstand this pressure. Patent Document 1 also partially considers downsizing the equipment when using alternative gases, but does not fully consider the tank itself.

[0067] There are two easy solutions. One is to make the tanks larger, but this goes against another social demand for smaller tanks. The other is to make the tanks thicker. However, this would increase the number of materials used and the energy required for transportation and manufacturing, which would worsen the environmental impact in other ways.

[0068] Therefore, the greatest feature of the present invention is that the tank structure is changed from the conventional rectangular shape to a structure with curved surfaces.

[0069] The concept of the present invention will be explained first with reference to Figure 22. Although the details will be described later, a major feature is that the tank 11 has a curved structure. This allows for less gas pressure concentration compared to a rectangular structure, i.e., a structure with extensive corners, and therefore allows for improved pressure resistance per unit area compared to a rectangular structure. As a result, the tank can be made more compact or its wall thickness can be reduced. Although a curved surface is mentioned here, a circular shape would be ideal. Therefore, the following explanation will be given using an example of a circular shape.

[0070] Returning to Fig. 21, the internal structure of the gas-insulated switchgear will be described. In this embodiment, the built-in equipment itself does not require a specially designed design. This is also one of the advantages of the present invention.

[0071] The busbar chamber has a side input / output section 19. A first input / output terminal 41 is introduced into the tank 11 from the side input / output section 19. The opening of the side input / output section 19 is firmly fixed and sealed with an insulating resin member, for example, epoxy resin.

[0072] The current introduced from the first input / output terminal 41 is introduced into the disconnector 20 via the conductor 40. The disconnector 20 drives one of the pair of first electrodes 21 using a drive unit, and the current is turned on and off by the contact and separation between the electrodes.

[0073] The current introduced by the disconnector 20 is introduced into the vacuum circuit breaker 22 through the conductor 40. The current is turned on and off by contacting and separating a pair of electrodes within a space maintained in a vacuum state.

[0074] The conductor 40 runs from the busbar room 10 to the equipment room 12, with a spacer 14 between them to provide airtight separation between the busbar room 10 and the equipment room 12. The spacer 14 is insulated to prevent a problem such as a short circuit from spreading to the other room and expanding the scale of the problem if such a problem occurs in either the busbar room 10 or the equipment room 12.

[0075] The current passes through the vacuum circuit breaker 22 and enters the disconnector 23 via the conductor 40. The disconnector 23 drives one of a pair of second electrodes 24 using a drive unit, and the current is turned on and off depending on the contact and separation between the electrodes. The current turned on by the disconnector 23 flows through the conductor 40 to the second input / output terminal 42. In this way, the current in the gas-insulated switchgear is turned on and off.

[0076] The first input / output terminal 41 and the second input / output terminal 42 are input terminals and output terminals, respectively. Their names and roles vary depending on how they are used. Alternatively, one may be referred to as the power source side and the other as the power consumption device side.

[0077] 21 also shows a grounding switch 25. This is used when driving either of the pair of third electrodes 26 to set the entire device at ground potential.

[0078] Also disclosed is a lightning arrester 27. While it appears to be always connected in Figure 21, it is made of a unique material, a special insulator that only exhibits conductivity under high voltage. One example is zinc oxide. By using this material, a structure is realized in which, although it is technically connected, it is electrically insulated under normal conditions, but becomes conductive under extremely high voltages such as lightning strikes. This device prevents damage to equipment by dissipating unexpected high voltages, such as lightning strikes, to the ground potential connected to the lightning arrester.

[0079] The structure of the tank 11 will be further explained with reference to Figure 21. Reference numeral 15 denotes a first circular hatch, and 16 denotes a second circular hatch. The first circular hatch 15 is larger than the second circular hatch 16. This is because the first circular hatch 15 is required to provide electrical continuity for the second input / output terminals 42, and three terminals are required when the second input / output terminals 42 are three-phase, so the first circular hatch 15 is made larger than the second circular hatch 16 to ensure sufficient insulation distance between the terminals.

[0080] The second circular hatch 16 is mainly intended for inspection and for installing equipment during manufacturing. Therefore, if other methods can be used instead, the second circular hatch 16 is not essential. However, considering the actual work area and maintenance, it is desirable to provide it.

[0081] The tank 11 has a first rectangular hatch 17 and a second rectangular hatch 18 on the surface opposite to the first circular hatch 15 .

[0082] The second rectangular hatch 18 is a hatch for installing the disconnector 20 in the tank 11. The first rectangular hatch 17 is a hatch for installing the disconnector 23 and the drive unit of the vacuum circuit breaker 22 in the tank 11.

[0083] As is clear, when comparing the first rectangular hatch 17 with the second rectangular hatch 18, the first rectangular hatch 17 is larger. Therefore, from the viewpoint of pressure response to an increase in gas pressure, consideration of the first rectangular hatch 17 is more important.

[0084] Therefore, in the present invention, we have gone beyond giving the tank 11 a curved surface and have investigated the desirable configuration for the shape and size of the hatch to accommodate increased gas pressure.

[0085] As a result, the inventors of the present invention found that the greater the maximum width of the opening in the lateral direction, the greater the pressure applied by the hatch.

[0086] Therefore, in the present invention, a further configuration is employed in a gas-insulated switchgear having multiple hatches, in which the wider the hatch is in the lateral direction, the thicker the hatch wall is. As an example, the first circular hatch 15 is 830 mm in diameter, i.e., the width is 830 mm, but the wall thickness is 32 mm. Similarly, the first rectangular hatch 17 is 590 mm in width, but the wall thickness is 9 mm. This ensures safety even when hatches are provided in a gas-insulated switchgear that is pressurized using dry air, and also reduces wall thickness where possible, thereby achieving improved environmental performance through weight reduction and reduced component usage.

[0087] Furthermore, the evaluation results showed that the difference in maximum vertical width had a smaller effect on the tank's pressure resistance than the difference in maximum horizontal width. Although the exact reason is not clear, it is currently assumed that when using a circular tank, the horizontal cross section changes continuously, making it susceptible to the effects of differences in gas pressure and shape, whereas the vertical cross section remains the same and does not change, making it less susceptible to the effects of differences in gas pressure and shape.

[0088] The structure will be described further with reference to the top view of Fig. 22. Note that the same reference numerals as in Fig. 21 denote the same components, and therefore will not be described again.

[0089] Reference numeral 45 denotes a bottom plate, and in the top view, it is seen that the corners of the bottom plate protrude from the tank 11. In Fig. 22, the first input / output terminals 41 are a set of three wires corresponding to three phases. They are provided on both the top and bottom in the drawing. However, the present invention also includes the case where they are provided on only one side.

[0090] Also, in the figure, 18 has 17 hidden underneath it. Similarly, 20 in the figure has 22 and 23 hidden underneath it.

[0091] The first circular hatch 15 has an opening / closing door 55 shown on its front side. Although the drawings in this specification include drawings in which the opening / closing door is not separately shown for various hatches, in reality, the hatch has an opening / closing door.

[0092] Fig. 23 is a side view of an example of a gas-insulated switchgear of the present invention. Since the same reference numerals as in Fig. 21 denote the same components, repeated explanations will be omitted. Compared to the cross-sectional view of Fig. 21, the tank 11 is circular, and therefore each hatch is formed around the side of the tank 11.

[0093] Figure 24 is a rear view of an example of a gas-insulated switchgear according to the present invention. This corresponds to the external view of Figure 21 as seen from the right side. Note that the same reference numerals as in Figure 21 denote the same components, and therefore will not be described again. It can be seen that the first circular hatch 15 is larger than the second circular hatch 16.

[0094] Fig. 25 is a front view of an example of a gas-insulated switchgear according to the present invention. It corresponds to a view of the external configuration of Fig. 21 as seen from the left side. Note that the same reference numerals as in Fig. 21 denote the same members, and therefore will not be described again.

[0095] 26 is an explanatory diagram of the bottom plate of an example of a gas-insulated switchgear according to the present invention. Because the tank 11 is circular, a structural feature is that large spaces are created at the corners of the bottom plate 45. Therefore, these large spaces are utilized to provide mounting holes 59. This not only simplifies installation, but also eliminates the need to secure additional space for mounting holes, enabling further miniaturization.

[0096] Figure 27 is a modified example of Figure 26. As can be seen from Figure 26, there is still space in the mounting hole 59 in the direction toward the tank 11. Therefore, in Figure 27, the mounting hole 59 is made an elongated hole in the direction toward the tank 11. This makes it easier to align the position during assembly and installation work, improving work efficiency and reducing time.

[0097] The above-described embodiments may be used in combination, since the combined effects of each embodiment can be achieved.

[0098] The above-mentioned technical concepts can be used alone or in combination, and these cases are also included within the scope of the present invention.

[0099] Furthermore, as long as the technical concept detailed above is applied, any modifications or slight variations in the structure are also included within the scope of the present invention.

[0100] An example of the invention disclosed in this specification is as follows.

[0101] <No. 1> A switchgear having a pressure vessel with an electrical contact provided therein and a containment vessel for storing the pressure vessel, wherein the containment vessel is formed to cover the pressure vessel.

[0102] <Item 2> The switchgear according to item <Item 1>, wherein the containment vessel further contains a control device.

[0103] <Item 3> The opening and closing device according to item <Item 2>, wherein the containment vessel has a partition wall that separates a control room in which the control equipment is installed and a tank room in which the pressure vessel is installed.

[0104] <Item 4> The opening and closing device according to item <Item 3>, wherein the humidity control level of the control room is higher than the humidity control level of the tank room.

[0105] <Item 5> The opening and closing device according to item <Item 3>, wherein the level of waterproofing of the control room is higher than the level of waterproofing of the tank room.

[0106] <Item 6> The switchgear according to item <Item 4>, wherein the control chamber has a heater.

[0107] <No. 7> The switchgear according to <No. 2>, wherein the containment vessel is formed by combining a plurality of plates.

[0108] <No. 8> The opening and closing device according to <No. 7>, wherein the plurality of plates are fixed to a frame having a width greater than that of the pressure vessel.

[0109] <No. 9> The opening and closing device according to <No. 8>, further comprising a support stay integrated with the pressure vessel, and a frame having a width greater than that of the pressure vessel is fixed to the support stay.

[0110] <Item 10> The opening and closing device according to item <Item 9>, wherein the pressure vessel, the support stay, the frame, and the plate are all made of metal.

[0111] <No. 11> The switchgear according to <No. 7>, wherein some of the plurality of plates have inclined portions, and the roof of the containment vessel is disposed at the inclined portions.

[0112] <Item 12> The switchgear according to <Item 11>, wherein the containment vessel correlates with the shape of the pressure vessel and changes shape midway.

[0113] 10: Busbar room 11: Tank 12: Equipment room 14: Spacer 15: First circular hatch 16: Second circular hatch 17: First rectangular hatch 18: Second rectangular hatch 19: Side input / output section 20: Disconnector 21: Pair of first electrodes 22: Vacuum circuit breaker 23: Disconnector 24: Pair of second electrodes 25: Earthing switch 26: Pair of third electrodes 27: Lightning arrester 40: Conductor 41: First input / output terminal 42: Second input / output terminal 45: Bottom plate 55: Openable door 56: Openable door 59: Mounting hole 100: Containment vessel 101: Ceiling plate 103: Bending portion 104: Second ceiling plate 105: First plate member 106: Second plate member 107: Fastening member 108: Inclined member 109: Hole 110: Tank 120: Driving equipment 121: Control equipment 122: Hatch 130: Connection 131: External connection 132: Opening / closing door 133: Door knob 140: Frame 141: Bottom plate 142: Bottom plate opening 143: Opening when bottom plate is not formed 150: Air hole 160: Partition wall 170: Tank room 171: Control room 180: Frame 190: Heater 500: Welded part 600: Support stay

Claims

1. A switchgear having a pressure vessel with electrical contacts provided therein and a containment vessel for housing the pressure vessel, wherein the containment vessel is formed to cover the pressure vessel.

2. A switchgear according to claim 1, wherein the containment vessel further contains a control device.

3. An opening and closing device according to claim 2, wherein the containment vessel has a partition wall separating a control room in which the control equipment is installed from a tank room in which the pressure vessel is installed.

4. A switchgear according to claim 3, wherein the level of humidity control in the control room is higher than the level of humidity control in the tank room.

5. An opening and closing device according to claim 3, wherein the level of waterproofing for the control room is higher than the level of waterproofing for the tank room.

6. A switchgear according to claim 4, wherein the control room has a heater.

7. A switchgear according to claim 2, wherein the containment vessel is constructed by combining a plurality of plates.

8. A switchgear according to claim 7, wherein the plurality of plates are fixed to a frame having a width greater than that of the pressure vessel.

9. A switchgear according to claim 8, comprising a support stay integrated with the pressure vessel, the support stay being fixed to a frame having a width greater than that of the pressure vessel.

10. A switchgear according to claim 9, wherein the pressure vessel, the support stay, the frame and the plate are all made of metal.

11. A switchgear according to claim 7, wherein some of the plurality of plates have inclined portions, and the roof of the containment vessel is positioned on the inclined portions.

12. A switchgear according to claim 11, wherein the containment vessel is correlated with the shape of the pressure vessel and changes shape midway.

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