Gas-insulated switchgear

Abstract

To solve a problem in which, when the shape of the sides connecting a main pipe and a branch pipe is entirely curved, the planar area of a reinforcing member is small, which tends to reduce the strength of the reinforcing member.SOLUTION: A gas-insulated switchgear includes a pressure vessel (1) including a main pipe (11) and a branch pipe (12), and a plate-shaped reinforcing member (10), the reinforcing member having a first side portion (13), a second side portion (14), and a third side portion (15), the third side portion including a straight portion (151) and a curved portion (152).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a gas-insulated switchgear.

Background Art

[0002] Patent Document 1 discloses a gas-insulated switchgear in which a reinforcing rib is provided on the side surface of a branch pipe as a structure for suppressing stress generated in a container composed of a main pipe and a branch pipe branching from the main pipe. The reinforcing rib described in Patent Document 1 has a curved portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the prior art as described above, when the shape of the side connecting the main pipe and the branch pipe is only a curve, the planar area of the reinforcing member becomes small, so the strength of the reinforcing member tends to be low.

Means for Solving the Problems

[0005] In order to solve the above problems, a gas-insulated switchgear according to an aspect of the present disclosure includes a pressure vessel including a main pipe and a branch pipe branching from the main pipe, and a plate-shaped reinforcing member connected to the main pipe and the branch pipe. The reinforcing member has a first side portion connected to the main pipe, a second side portion connected to the branch pipe, and a third side portion connecting the first side portion and the second side portion. The third side portion includes a straight portion and a curved portion recessed toward the connection portion between the main pipe and the branch pipe.

Effects of the Invention

[0006] According to an aspect of the present disclosure, the strength of the reinforcing member can be improved.

Brief Description of the Drawings

[0007] [Figure 1] This is a perspective view showing the external configuration of a gas-insulated switchgear according to an embodiment of the present disclosure. [Figure 2] This is a partially enlarged view of a gas-insulated switchgear according to an embodiment of the present disclosure. [Figure 3] This figure shows the results of stress analysis using reinforcing members within the scope of this disclosure and reinforcing members outside the scope of this disclosure. [Figure 4] This is a partially enlarged view of a gas-insulated switchgear according to another embodiment of the present disclosure. [Figure 5] This is a partially enlarged view of a gas-insulated switchgear according to yet another embodiment of the present disclosure. [Modes for carrying out the invention]

[0008] [Embodiment 1] Figure 1 is a perspective view showing the external configuration of the gas-insulated switchgear 101 according to Embodiment 1.

[0009] The gas-insulated switchgear 101 mainly comprises a current transformer (CT), a cable head (CHD), a power receiving unit (RU), a second circuit breaker unit (3), a connection unit (4), and a busbar chamber (5). The power receiving unit (RU) has a pressure vessel (1) and a first circuit breaker unit (2). The current transformer (CT) measures the current flowing through the circuit. The cable ends of the circuits are connected to the cable head (CHD).

[0010] The first circuit breaker unit 2, the busbar room 5, and the second circuit breaker unit 3 are arranged so as to be stacked vertically. Specifically, the second circuit breaker unit 3 is located below (directly below) the busbar room 5, and the first circuit breaker unit 2 is located above (directly above) the busbar room 5. The connection unit 4 is located to the side of the second circuit breaker unit 3. The pressure vessel 1 is located above the connection unit 4. The pressure vessel 1 has a main pipe 11 and branch pipes 12 that branch off from the main pipe 11. The branch pipe 12 shown in Figure 1 is a branch pipe connected to the cable head CHD and has an electrical circuit inside, but it can be any pipe branched off from the pressure vessel 1, and is not limited to this.

[0011] Figure 2 is a partially enlarged view of the gas-insulated switchgear 101 shown in Figure 1, and is a schematic diagram showing how the reinforcing member 10 according to Embodiment 1 is attached to the pressure vessel 1. In other words, the gas-insulated switchgear 101 comprises a main pipe 11, a branch pipe 12, and a reinforcing member 10.

[0012] The main pipe 11 is a pipe equipped with a power receiving device inside, and has a main pipe flange 111 at its end.

[0013] The branch pipe 12 is a pipe that branches off from the main pipe 11, and is equipped with a branch pipe flange 121 at the end opposite to the end connected to the main pipe 11. In this disclosure, the branch pipe 12 is connected perpendicularly to the main pipe 11, but is not necessarily limited to perpendicular, and may be connected at an angle. The inside of the pressure vessel 1 is filled with insulating gas, and the pressure inside is maintained higher than the pressure outside the pressure vessel 1.

[0014] When internal pressure is applied to the pressure vessel 1, the main pipe 11 and branch pipes 12 attempt to deform so as to expand outward. This places a load on the pressure vessel 1. For example, a large localized load is placed at the connection point between the main pipe 11 and the branch pipes 12 due to the deformation of the main pipe 11 and branch pipes 12, so a reinforcing member 10 is provided to suppress this deformation.

[0015] The reinforcing member 10 is a reinforcing member that connects to the main pipe 11 and the branch pipes 12 and reinforces the pressure vessel 1. As shown in the perspective view of Figure 1, the reinforcing member 10 is plate-shaped. The reinforcing member 10 is made of a rigid material, such as soft iron, aluminum, or stainless steel. The planar shape of the reinforcing member 10, as shown in Figure 2, includes a first side portion 13, a second side portion 14, and a third side portion 15 connecting the first side portion 13 and the second side portion 14. Here, "plane" means a plane that includes the direction in which the first side portion 13 extends and the direction in which the second side portion 14 extends. Hereafter, the plane that includes the direction in which the first side portion 13 extends and the direction in which the second side portion 14 extends will be simply referred to as a plane. Also, the area of ​​the reinforcing member 10 when this plane is viewed from above will be simply referred to as the planar area.

[0016] The reinforcing member 10 may be positioned such that the first side portion 13 is located on the side surface of the main pipe 11 and the second side portion is located along the side surface of the branch pipe. In Embodiment 1, since the angle between the main pipe 11 and the branch pipe 12 is substantially perpendicular, the angle between the first side portion 13 and the second side portion 14 is also substantially perpendicular. However, the angle between the first side portion 13 and the second side portion 14 is not limited to substantially perpendicular. The angle between the first side portion 13 and the second side portion 14 can be appropriately changed depending on the angle between the main pipe 11 and the branch pipe 12.

[0017] The first side 13 and the second side 14 are connected to the side of the main pipe 11 and the side of the branch pipe 12, respectively, by welding or other means. The third side 15 refers to the entire line segment connecting the first side 13 and the second side 14. The third side 15 includes a straight section 151 and a curved section 152.

[0018] The straight section 151 is the straight part of the third side section 15. The curved section 152 is the curved part of the third side section 15. The curve of the curved section 152 has a shape that is concave towards the connection point between the main pipe 11 and the branch pipe 12.

[0019] Furthermore, the straight portion 151 includes a first straight portion 151A that extends from the first side portion 13 substantially perpendicular to the main pipe 11, and a second straight portion 151B that extends from the second side portion 14 substantially perpendicular to the branch pipe 12. The curved portion 152 is located between the first straight portion 151A and the second straight portion 151B.

[0020] Since the third side portion 15 includes the first straight portion 151A and the second straight portion 151B, the planar area of the reinforcing member 10 increases, so that the strength of the reinforcing member 10 can be improved.

[0021] Furthermore, at least a part of the second straight portion 151B is connected to the branch pipe flange 121. The second straight portion 151B and the branch pipe flange 121 may be connected by welding or the like. Also, in the example shown in FIG. 2, the length of the second straight portion 151B is longer than the radial length of the flange surface of the branch pipe flange 121, but it may be shorter than the radial length of the flange surface.

[0022] Since the second straight portion 151B is connected to the branch pipe flange 121, the fixing of the reinforcing member 10 to the pressure vessel 1 becomes even stronger, and the reinforcement strength of the pressure vessel 1 can be further improved.

[0023] Furthermore, as shown in FIG. 1, the reinforcing member 10 is attached to a branch pipe 12 having an oval cross section including a straight portion and an arc portion. The reinforcing member 10 is located on the straight portion of the oval shape of the branch pipe 12.

[0024] When internal pressure is applied to the pressure vessel 1, the side surface of the branch pipe 12 corresponding to the straight portion in the cross section tends to deform outward. Due to this deformation, the side surface of the branch pipe 12 corresponding to the arc portion in the cross section tends to deform inward, so a large load is applied to the connection portion between the main pipe 11 and the branch pipe 12. Therefore, in the branch pipe 12 having an oval cross-sectional shape, by reducing the possibility that the side surface corresponding to the straight portion of the branch pipe 12 deforms, it is possible to also reduce the possibility that the side surface corresponding to the arc portion of the branch pipe 12 deforms. As a result, the load applied to the connection portion between the main pipe 11 and the branch pipe 12 can be significantly reduced.

[0025] Furthermore, the reinforcing member 10 may also be attached to, for example, the arc-shaped section. Also, the cross-sectional shape of the branch pipe 12 to which the reinforcing member 10 is attached does not necessarily have to be oval. For example, the reinforcing member 10 may be attached to a branch pipe 12 whose cross-sectional shape is elliptical or circular.

[0026] Multiple reinforcing members 10 are arranged for each branch pipe 12. By arranging multiple reinforcing members 10, the load on the connection between the main pipe 11 and the branch pipe 12 can be further reduced.

[0027] Furthermore, as shown in Figure 2, the third side portion 15 includes a third straight section 151C between the curved portion 152 and the second straight section 151B. The third straight section 151C extends from the end of the curved portion 152 and forms a straight line. The curved portion 152 and the third straight section 151C are connected smoothly enough to be visually apparent. By including the third straight section 151C, the surface area of ​​the reinforcing member 10 can be further increased, thereby improving the strength of the reinforcing member 10 itself. The third straight section 151C may be located between the curved portion 152 and the first straight section 151A. Alternatively, the third side portion 15 may have the third straight section 151C both between the curved portion 152 and the second straight section 151B, and between the curved portion 152 and the first straight section 151A.

[0028] Furthermore, the third side portion 15 may include a chamfered portion 20, as shown in Figure 2. The chamfered portion 20 is the part of the third side portion 15 where the corner has been chamfered. The chamfered portion 20 may be provided at the corner between the first straight portion 151A and the curved portion 152, for example, as shown in Figure 2. When the third side portion 15 includes a corner, there is a possibility of injury to the worker depending on the location of the corner. By chamfering the corner, the possibility of injury to the worker can be reduced.

[0029] [Stress Analysis] The effects of having a curved portion 152 in the reinforcing member 10 are described below based on verification results obtained using stress analysis. Figure 3 shows the results of stress analysis when the reinforcing member 10, which is within the scope of this disclosure, and the reinforcing member E, which is outside the scope of this disclosure, are attached to the pressure vessel 1 of Embodiment 1. Hereinafter, the verification example when the reinforcing member 10 is attached to the pressure vessel 1 will be referred to as the Example, and the verification example when the reinforcing member E is attached to the pressure vessel 1 will be referred to as the Comparative Example.

[0030] The reinforcing member 10 has the configuration described above in Embodiment 1, and its third side includes a curved portion 152. On the other hand, the reinforcing member E does not include a curved portion 152 in its third side; in other words, its third side is composed only of a straight line. The stress distribution diagram 301 shown in Figure 3 is the stress distribution diagram when the reinforcing member 10 is attached to the pressure vessel 1, and the stress distribution diagram 302 is the stress distribution diagram when the reinforcing member E is attached to the pressure vessel 1. In these two stress distribution diagrams, the darker areas indicate low stress on the material, and the brighter areas indicate high stress.

[0031] To verify the generated stress, a pressure vessel 1 without reinforcing members was first sealed with insulating gas at a gauge pressure of 0.7 MPa and a stress analysis was performed (not shown). In the pressure vessel 1 without reinforcing members, the maximum stress occurred at the connection point between the main pipe 11 and the arc portion of the branch pipe 12, and the maximum stress at this point was 132 MPa.

[0032] Next, for both the example and the comparative example, an insulating gas was sealed into the pressure vessel 1 at a gauge pressure of 0.7 MPa, and stress analysis was performed. At this time, the stress at the connection between the main pipe 11 and the arc portion of the branch pipe 12 was 71 MPa in the example and 73 MPa in the comparative example. This confirmed that both the reinforcing member 10 and the reinforcing member E have the effect of reducing the stress at the location where the maximum stress occurs in the pressure vessel 1 compared to the case without the reinforcing member.

[0033] Furthermore, the stress generated at the connection point between the reinforcing member (10, E) and the main pipe 11 was 132 MPa in the example, compared to 155 MPa in the comparative example. This confirmed that the reinforcing member 10 has the effect of reducing the stress generated at the connection point between the reinforcing member (10, E) and the main pipe 11 compared to the reinforcing member E.

[0034] In Figure 3, the stress distribution diagram 301, which is an example, shows that particularly high stress is applied to the curved portion 152 of the reinforcing member 10, compared to the stress distribution diagram 302, which is a comparative example.

[0035] These results demonstrate that by including a curved portion 152, the reinforcing member 10 can alleviate the concentration of stress exerted from the reinforcing member 10 to the main pipe 11. Furthermore, by including a straight portion 151, the reinforcing member 10 can increase the surface area of ​​its plane compared to one with only a curved third side, thereby improving the strength of the reinforcing member 10 itself.

[0036] [Embodiment 2] Other embodiments of this disclosure are described below. For convenience of explanation, components having the same function as those described in Embodiment 1 are denoted by the same reference numerals, and their descriptions are not repeated.

[0037] Figure 4 is a schematic diagram showing how the reinforcing member 10A according to Embodiment 2 is attached to the pressure vessel 1A.

[0038] As shown in Figure 4, the pressure vessel 1A comprises a main pipe 11A, a branch pipe 12A, and a reinforcing member 10A. The reinforcing member 10A differs from the reinforcing member 10 of Embodiment 1 in that it further comprises a notch 16 and a notch 17. The other configurations are the same as those of the reinforcing member 10.

[0039] The notch 16 is a notch provided at the corner where the first side 13 and the second side 14 intersect. When the main pipe 11A and the branch pipe 12A are connected by welding, a fillet weld portion W3 of the branch pipe may be formed at the connection point, as shown in Figure 4. The notch 16 is cut out to avoid the fillet weld portion W3 of the branch pipe, thereby preventing the reinforcing member 10A from being connected near the fillet weld portion W3. For example, if another welding point is provided near the fillet weld portion W3 of the branch pipe formed by welding, there is a concern that the strength will decrease due to the heat effect. Therefore, when the main pipe 11A and the branch pipe 12A are connected by welding, and the reinforcing member 10A and the pressure vessel 1A are connected by welding, the notch 16 allows the reinforcing member 10A to be connected without interfering with the fillet weld portion W3 of the branch pipe.

[0040] The notch 17 is a notch provided at the corner where the second side portion 14 and the second straight portion 151B intersect. When the branch pipe 12A and the branch pipe flange 121 are connected by welding, a fillet weld portion W2 of the branch pipe flange may be formed at the connection point, as shown in Figure 4 for the branch pipe 12A. The notch 17 is cut out to avoid the fillet weld portion W2 of the branch pipe flange, thereby preventing the reinforcing member 10A from being connected near the fillet weld portion W2. As mentioned above, if another welding point is provided near a welded point, there is a concern that the strength will decrease due to the effects of heat. Therefore, when the branch pipe flange 121 and the branch pipe 12A are connected by welding, and the reinforcing member 10A and the pressure vessel 1A are connected by welding, the notch 17 allows the reinforcing member 10A to be connected without interfering with the fillet weld portion W2 of the branch pipe flange.

[0041] [Embodiment 3] Further embodiments of this disclosure are described below. For convenience of explanation, components having the same function as those described in Embodiments 1 and 2 are denoted by the same reference numerals, and their descriptions are not repeated.

[0042] Figure 5 is a schematic diagram showing how the reinforcing member 10B according to Embodiment 3 is attached to the pressure vessel 1B.

[0043] As shown in Figure 5, the pressure vessel 1B comprises a main pipe 11A, a branch pipe 12A, and a reinforcing member 10B. The reinforcing member 10B has a third side portion 15A instead of the third side portion 15 of the reinforcing member 10A according to Embodiment 2. Furthermore, the reinforcing member 10B further comprises a notch portion 18 and a notch portion 19, but does not have a notch portion 17, which is different from the reinforcing member 10A according to Embodiment 2. However, the notch portion 17 has been omitted for the sake of explanation, and in reality, a notch portion 17 may be provided as needed. The other configurations are the same as those of the reinforcing member 10A.

[0044] The third side 15A comprises a straight section 1511 and a curved section 1522. The straight section 1511 includes a first straight section 151A, a second straight section 151B, a third straight section 151C, and a fourth straight section 151D. The third straight section 151C and the fourth straight section 151D are straight sections located between the first straight section 151A and the second straight section 151B.

[0045] The curved section 1522 includes the first curved section 152A and the second curved section 152B. The first curved section 152A is located between the third straight section 151C and the fourth straight section 151D. The second curved section 152B is located between the fourth straight section 151D and the second straight section 151B. In other words, the third side section 15A is connected to the first straight section 151A, the third straight section 151C, the first curved section 152A, the fourth straight section 151D, the second curved section 152B, and the second straight section 151B in this order.

[0046] With the above configuration, two curved sections 1522 are provided, and a straight section 151 is interposed between the two curved sections 1522, which makes it possible to further increase the planar area of ​​the reinforcing member 10B and further improve the strength of the reinforcing member 10B itself.

[0047] The positions of each straight section 1511 and each curved section 1522 may be arbitrarily arranged, and the number of straight sections 1511 and the number of curved sections 1522 may also be arbitrarily set.

[0048] Furthermore, the third side portion 15A may have only one or more curved sections. For example, the third side portion 15A may have only the second curved section 152B, and the portion corresponding to the first curved section 152A may not have a curve. In other words, the third straight section 151C and the fourth straight section 151D may be continuous.

[0049] As shown in Figure 5, at least a portion of the first straight section 151A of the reinforcing member 10B is connected to the main pipe flange 111. By connecting the first straight section 151A to the main pipe flange 111, the reinforcing member 10B is further fixed, and the reinforcement of the pressure vessel 1B becomes stronger.

[0050] The notch 18 is provided at the corner where the first side portion 13 and the first straight portion 151A intersect. When the main pipe 11A and the main pipe flange 111 are connected by welding, a fillet weld portion W1 of the main pipe flange may be formed at the connection point, as shown in Figure 5. The notch 18 is cut out to avoid the fillet weld portion W1 of the main pipe flange, thereby preventing the reinforcing member 10B from being connected near the fillet weld portion W1. As mentioned above, if another welding point is provided near a welded point, there is a concern that the strength will decrease due to the effects of heat. Therefore, when the main pipe flange 111 and the main pipe 11 are connected by welding, and the reinforcing member 10B and the pressure vessel 1B are connected by welding, the notch 18 allows the reinforcing member 10B to be connected without interfering with the fillet weld portion W1 of the main pipe flange.

[0051] Furthermore, the notch 19 is provided on the first side portion 13 at locations other than the corners near the connection point between the main pipe flange 111 and the main pipe 11. By providing the notch 19 on the first side portion 13, it becomes unnecessary to weld the entire first side portion 13, thus reducing the number of welds and improving work efficiency.

[0052] 〔summary〕 Embodiment 1 of a gas-insulated switchgear according to the present disclosure comprises a pressure vessel including a main pipe and branch pipes branching from the main pipe, and a plate-shaped reinforcing member connected to the main pipe and the branch pipe, wherein the reinforcing member has a first side connected to the main pipe, a second side connected to the branch pipe, and a third side connecting the first side and the second side, and the third side includes a straight portion and a curved portion that is recessed toward the connection portion between the main pipe and the branch pipe.

[0053] Embodiment 2 of the gas-insulated switchgear according to the present disclosure is, in Embodiment 1, the straight section includes a first straight section extending substantially perpendicular to the main pipe from the first side and a second straight section extending substantially perpendicular to the branch pipe from the second side, and the curved section is located between the first straight section and the second straight section.

[0054] Embodiment 3 of the gas-insulated switchgear according to the present disclosure is embodiment 1 or 2 wherein the third side portion includes a third straight portion between the curved portion and the first straight portion, or between the curved portion and the second straight portion.

[0055] Embodiment 4 of the gas-insulated switchgear according to the present disclosure is one of embodiments 1 to 3, wherein the branch pipe is provided with a branch pipe flange at the end opposite to the connection portion with the main pipe, and at least a portion of the second straight section is connected to the branch pipe flange.

[0056] Embodiment 5 of the gas-insulated switchgear according to the present disclosure is one of embodiments 1 to 4, wherein the end of the main pipe is provided with a main pipe flange, and at least a portion of the first straight section is connected to the main pipe flange.

[0057] Embodiment 6 of the gas-insulated switchgear according to the present disclosure is one of embodiments 1 to 5, wherein the cross-sectional shape of the branch pipe is an elliptical shape including a straight section and an arc section, and the reinforcing member is located in the straight section.

[0058] Embodiment 7 of the gas-insulated switchgear according to the present disclosure is one of embodiments 1 to 6, wherein the reinforcing member has a notch at the corner where the first side and the second side intersect.

[0059] Embodiment 8 of the gas-insulated switchgear according to the present disclosure is one of embodiments 1 to 7, wherein the reinforcing member has a notch at the corner where the second side and the second straight section intersect.

[0060] Embodiment 9 of the gas-insulated switchgear according to the present disclosure is one of embodiments 1 to 8, wherein the reinforcing member has a notch at the corner where the first side and the first straight section intersect.

[0061] Embodiment 10 of the gas-insulated switchgear according to the present disclosure is one of embodiments 1 to 9, wherein the reinforcing member has further notches in the first side portion, in addition to the corner portion.

[0062] This disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of this disclosure. [Explanation of Symbols]

[0063] 101 Gas-insulated switchgear 1, 1A, 1B pressure vessels 10, 10A, 10B Reinforcement members 11 Master 111 Main pipe flange 12, 12A branch pipe 121 Branch pipe flange 13. First side 14. Second side 15, 15A Third side 151, 1511 Straight section 151A 1st straight section 151B 2nd straight section 151C 3rd straight section 152, 1522 curved section 16, 17, 18, 19 Notches

Claims

1. A pressure vessel including a main pipe and branch pipes branching from the main pipe, The main pipe and the branch pipe are connected to plate-shaped reinforcing members, The reinforcing member is The first side portion connected to the main pipe, The second side portion connected to the branch pipe, It has a third side portion connecting the first side portion and the second side portion, The third side portion includes a straight portion and a curved portion that is recessed toward the connection portion between the main pipe and the branch pipe, the straight portion includes a first straight portion extending substantially perpendicular to the main pipe from the first side portion and a second straight portion extending substantially perpendicular to the branch pipe from the second side portion, and the curved portion is located between the first straight portion and the second straight portion, a gas-insulated switchgear.

2. The gas-insulated switchgear according to claim 1, wherein the third side portion includes a third straight portion between the curved portion and the first straight portion, or between the curved portion and the second straight portion.

3. The branch pipe is equipped with a branch pipe flange at the end opposite to the connection point with the main pipe. The gas-insulated switchgear according to claim 1, wherein at least a portion of the second straight section is connected to the branch pipe flange.

4. The end of the main pipe is equipped with a main pipe flange. The gas-insulated switchgear according to claim 1, wherein at least a portion of the first straight section is connected to the main pipe flange.

5. A pressure vessel including a main pipe and branch pipes branching from the main pipe, The main pipe and the branch pipe are connected to plate-shaped reinforcing members, The reinforcing member is The first side portion connected to the main pipe, The second side portion connected to the branch pipe, It has a third side portion connecting the first side portion and the second side portion, The third side portion includes a straight portion and a curved portion that is recessed toward the connection point between the main pipe and the branch pipe. The cross-sectional shape of the branch pipe is an oval shape including a straight section and an arc section. The reinforcing member is a gas-insulated switchgear located in the straight section.

6. A pressure vessel including a main pipe and branch pipes branching from the main pipe, The main pipe and the branch pipe are connected to plate-shaped reinforcing members, The reinforcing member is The first side portion connected to the main pipe, The second side portion connected to the branch pipe, It has a third side portion connecting the first side portion and the second side portion, The third side portion includes a straight portion and a curved portion that is recessed toward the connection point between the main pipe and the branch pipe. The reinforcing member has a notch at the corner where the first side and the second side intersect, in a gas-insulated switchgear.

7. The gas-insulated switchgear according to claim 3, wherein the reinforcing member has a notch at the corner where the second side and the second straight section intersect.

8. The gas-insulated switchgear according to claim 4, wherein the reinforcing member has a notch at the corner where the first side and the first straight section intersect.

9. The gas-insulated switchgear according to claim 8, wherein the reinforcing member has further notches in the first side portion other than the corner portion.

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