Gas-insulated switchgear

Abstract

A gas-insulated switchgear (100) is provided with a plurality of disconnector modules (10) and a breaker module (30). The plurality of disconnector modules (10) are disposed such that the central axes of first pressure tanks (11A-11C) are parallel to each other. The first pressure tanks (11A-11C) and a second pressure tank (11D) each have at least one second opening (11K2) on the side surface thereof. The adjacent disconnector modules (10) and the disconnector module (10) and the breaker module (30) that are adjacent to each other have the second openings (11K2) thereof connected to each other to constitute a single closed space (100R), and an insulating gas is sealed in the closed space (100R).

Description

Gas-insulated switchgear

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

[0002] A gas-insulated switchgear is a switchgear in which devices such as circuit breakers and disconnectors are housed in a pressure tank filled with an insulating medium such as a highly insulating gas (e.g., sulfur hexafluoride (SF6)). The gas-insulated switchgear contributes to reducing the space required for installation by making the devices compact due to the excellent insulating performance of the insulating medium. For example, as shown in Patent Document 1, multiple devices are housed in a cubic pressure tank, thereby reducing the installation area.

[0003] International Publication No. WO2016 / 157495

[0004] However, when changing the insulating medium sealed inside the pressure tank to one with a lower GWP (Global Warming Potential), since the GWP value and insulating performance are generally inversely proportional, it is necessary to increase the insulating distance of the internal equipment and main circuit conductors, which increases the volume of the pressure tank.

[0005] This increases the external dimensions of the gas-insulated switchgear, restricting the locations where it can be installed. Although it is possible to maintain insulation performance without increasing the insulation distance by increasing the filling pressure of the insulating medium, in the case of a cubic pressure tank configuration such as that disclosed in Patent Document 1, measures such as increasing the thickness of the steel plates that make up the pressure tank or adding reinforcement are necessary to suppress deformation of the pressure tank due to an increase in internal pressure, which poses a problem of increasing the manufacturing costs of the gas-insulated switchgear.

[0006] The present disclosure discloses a technique for solving the above-described problems, and aims to provide an inexpensive gas-insulated switchgear that can reduce the installation area even if the filling pressure of the insulating medium increases.

[0007] The gas-insulated switchgear disclosed in the present disclosure is a gas-insulated switchgear comprising a plurality of disconnector modules and circuit breaker modules, wherein the disconnector module comprises a cylindrical first pressure tank having a first opening at one end in a central axis direction and the first opening being closed by a lid, and a disconnector disposed within the first pressure tank for opening and closing a main circuit in the central axis direction of the first pressure tank, the circuit breaker module comprises a cylindrical second pressure tank having a third opening at least at one end in a central axis direction and the third opening being closed by a lid, and a circuit breaker disposed within the second pressure tank for interrupting the main circuit in the central axis direction of the second pressure tank, the plurality of disconnector modules are disposed such that the central axes of the first pressure tanks are parallel to each other, the first pressure tank and the second pressure tank each have at least one second opening on a side surface, the second openings of adjacent disconnector modules and adjacent disconnector modules and circuit breaker modules are connected to each other, and all of the first pressure tanks and the second pressure tanks form a single enclosed space, An insulating gas is sealed in the closed space.

[0008] According to the gas-insulated switchgear of the present disclosure, it is possible to provide a small-sized, inexpensive gas-insulated switchgear that can reduce the installation area even when the filling pressure of the insulating medium is increased.

[0009] Fig. 4 is a front view of a gas-insulated switchgear according to embodiment 1. Fig. 5 is a schematic perspective view showing the configuration of a disconnector module according to embodiment 1. Fig. 6 is a schematic perspective view showing the configuration of a disconnector module according to embodiment 1. Fig. 7 is a top perspective view of a gas-insulated switchgear according to embodiment 1. Fig. 8 is a schematic perspective view of a circuit breaker module according to embodiment 1 as viewed in the direction of arrow B in Fig. 4. Fig. 9 is a single-line diagram of a gas-insulated switchgear according to embodiment 1. Fig. 10 is a schematic perspective view showing the configuration of a disconnector module according to embodiment 2. Fig. 11 is a schematic perspective view showing the configuration of a disconnector module according to embodiment 3. Fig. 12 is a schematic perspective view showing the configuration of a disconnector module according to embodiment 4.

[0010] Embodiment 1.

[0011] A gas-insulated switchgear according to a first embodiment will now be described with reference to the drawings. In each drawing, the same reference numerals indicate the same or corresponding parts. FIG. 1 is a front view of a gas-insulated switchgear 100 according to the first embodiment. FIG. 2 is a schematic perspective view showing the configuration of a disconnector module 10 (10A). FIG. 2 is a schematic perspective view of the disconnector module 10 of FIG. 1 as viewed in the direction of arrow A. FIG. 2 shows a state in which the main circuit is closed. FIG. 3 is a schematic perspective view showing the configuration of the disconnector module 10. FIG. 3 is a schematic perspective view of the disconnector module 10 of FIG. 1 as viewed in the direction of arrow A. FIG. 3 shows a state in which the main circuit is open. FIG. 4 is a top perspective view of the gas-insulated switchgear 100.

[0012] As shown in FIG. 1 , the gas-insulated switchgear 100 includes three disconnector modules 10 and one circuit breaker module 30. Hereinafter, the three disconnector modules 10 will be referred to individually as disconnector modules 10A, 10B, and 10C. The disconnector modules 10A, 10B, and 10C have the same configuration. However, although the disconnector modules 10A, 10B, and 10C have the same configuration, the power supply is connected to the disconnector module 10C, so the direction of electrical energy flowing through the disconnector module 10C is opposite to that of the disconnector modules 10A and 10B. Furthermore, components with the letter A appended to their reference numerals refer to components of the disconnector module 10A. Similarly, components with the letter B appended to their reference numerals refer to components of the disconnector module 10B, and components with the letter C appended to their reference numerals refer to components of the disconnector module 10C.

[0013] Each disconnector module 10 is configured with a pressure tank 11 and one disconnector 20 housed inside the pressure tank 11. The disconnector modules 10A, 10B, and 10C and the circuit breaker module 30 are configured to be connected in series.

[0014] The pressure tanks 11A, 11B, and 11C (first pressure tanks) are arranged so that their respective central axes PA, PB, and PC are parallel and horizontal to one another, and have an opening 11K (first opening) shown in Figure 2 at one end (the front side of the paper in Figure 1) in the direction of the central axes PA, PB, and PC. As described above, one disconnector 20A, 20B, and 20C is installed inside each of the pressure tanks 11A, 11B, and 11C. Note that, although an example has been shown in which the respective central axes PA, PB, and PC of the pressure tanks 11A, 11B, and 11C are horizontal to one another, they do not necessarily have to be horizontal.

[0015] Pressure tank 11D (second pressure tank) is disposed so that its central axis PD is vertical, and has openings 11DK (third openings) at its upper and lower ends. That is, pressure tank 11D is disposed so that its central axis PD is perpendicular to the central axes PA, PB, and PC of pressure tanks 11A, 11B, and 11C, respectively. Note that, although an example has been shown in which pressure tank 11D's central axis PD is perpendicular to the central axes PA, PB, and PC of pressure tanks 11A, 11B, and 11C, respectively, it does not necessarily have to be perpendicular.

[0016] The pressure tank 11D is fitted with a circuit breaker 40. The circuit breaker 40 interrupts the large current flowing through the main circuit in the direction of the central axis PD of the pressure tank 11D. The pressure tank 11D may have only one opening. The opening 11DK is closed by a lid 82.

[0017] As shown in Figure 2, the pressure tank 11 has a curved wall 11L at the end opposite the opening 11K in the direction of the central axis P. The lid 8 is attached to the opening 11K via an O-ring R1. The O-ring R1 is housed in a groove M formed along the outer edge of the lid 8. Therefore, the interior of the pressure tank 11 is kept airtight from the outside.

[0018] The disconnector 20 includes a disconnector operating mechanism 9 , a drive shaft 91 , a cable-side conductor 12 , a conductor blade 14 , a bus-side conductor 13 , a bushing 16 , an input / output conductor 18 , and an insulating support portion 15 .

[0019] A disconnector operating mechanism 9 for opening and closing the disconnector 20 is fastened to the surface of the lid 8 facing the outside of the pressure tank 11, and the disconnector operating mechanism 9 provided outside the pressure tank 11 and a conductor blade 14 serving as an ON-OFF drive unit for the main circuit of the disconnector 20 inside the pressure tank 11 are connected by a drive shaft 91 that penetrates the lid 8. Note that airtightness is maintained between the drive shaft 91 and the lid 8 at the lid penetration portion 81.

[0020] The surface of the lid 8 facing the inside of the pressure tank 11 supports, via insulating support parts 15, the cable side conductor 12 of the disconnector 20, the bus side conductor 13 of the disconnector, and a conductor blade 14 that connects the main circuits by the disconnector operating mechanism 9.

[0021] 2 and 3 , a bushing 16 for connecting the cable terminal 4 is attached to the bottom of the lid 8 with airtightness maintained by an O-ring R2, and the bushing 16 is connected to the cable-side conductor 12 via the input / output conductor 18. The cable terminal 4 is connected to the outer portion of the bushing 16 outside the pressure tank 11. Although only one each of the cable-side conductor 12, bus-side conductor 13, drive shaft 91, conductor blade 14, bushing 16, and input / output conductor 18 is shown in FIGS. 2 and 3 , three sets, i.e., three phases, are arranged from the front to the back of the paper in FIGS. 2 and 3 , and one disconnector operating mechanism 9 drives the three drive shafts 91 to disconnect (open / close) the main circuits for three phases in the direction of the central axis P of the pressure tank 11.

[0022] 1 and 2, when the pressure tank 11 is viewed from the side indicated by the arrow A in Fig. 1, three insulators 19 are lined up in the direction of the central axis P (PA) at the bottom of the pressure tank 11 on the side of the rear wall 11L, facing the rear wall 11L of the pressure tank 11. In reality, the three insulators 19 are arranged side by side, each shifted horizontally.

[0023] The three bus conductors 5 are supported from below by insulators 19 and are arranged side by side vertically and horizontally in the direction of the central axis of the pressure tank 11. That is, the bus conductors 5 extend horizontally from the front of the paper to the back of the paper in Fig. 2 and are arranged parallel to one another as shown in Fig. 4. As shown in Figs. 2 and 3, the three bus conductors 5 and the three bus-side conductors 13 are connected by main circuit conductors 17, respectively.

[0024] As shown in Figure 4, fastening flange portions 11F (11AF, 11BF, 11CF, 11DF) having flange openings 11K2 (11AK2, 11BK2, 11CK2, 11DK2) are provided on both side surfaces of the pressure tank 11. A lid 82 is fastened to one flange portion 11AF of the pressure tank 11A, ensuring airtightness and closing the pressure tank 11. The other flange portion 11AF is fastened to one flange portion 11BF of the adjacent pressure tank 11B with bolts, joining the disconnector modules 10A and 10B together.

[0025] Fig. 5 is a perspective schematic diagram of the circuit breaker module 30 as viewed in the direction of arrow B in Fig. 4. As shown in Fig. 5, fastening flange portions 11DF having flange openings 11DK2 are provided on both side surfaces of the pressure tank 11D of the circuit breaker module 30. One flange portion 11DF is fastened with a bolt to the other flange portion 11BF having a flange opening 11BK2 of the adjacent pressure tank 11B, as shown in Fig. 1, thereby connecting the disconnector module 10B and the circuit breaker module 30 to each other. Note that although the operation unit 32 of the circuit breaker module 30 is provided at the top in Fig. 1, it may also be provided at the bottom.

[0026] 1, the other flange portion 11DF is fastened with bolts to a flange portion 11CF having one flange opening 11CK2 of the adjacent pressure tank 11C, connecting the disconnector module 10B and the circuit breaker module 30. A lid 82 is fastened to the flange portion 11CF having the other flange opening 11CK2 of the pressure tank 11C, closing the pressure tank 11 and ensuring airtightness inside the pressure tank 11. Note that with respect to the pressure tank 11D, the positions of the two flange portions 11DF are offset in the direction of the central axis PD due to the arrangement of the circuit breaker 40.

[0027] In this way, the gas-insulated switchgear 100 has a structure in which any number of disconnector modules 10 and circuit breaker modules 30 can be selected and connected in series. The reason for arranging the circuit breaker modules vertically to the ground is to make efficient use of the installation space. The actual length of the circuit breaker modules 30 is longer than that of the disconnector modules 10. Therefore, the circuit breaker modules 30 are erected to reduce the overall installation space.

[0028] As shown in Fig. 5, one busbar connecting conductor 31 is connected to the busbar conductor 5 passing through the disconnector module 10B and the disconnector module 10A via the flange opening 11DK2 of the pressure tank 11D and the flange opening 11BK2 of the pressure tank 11B. The other busbar connecting conductor 31 is connected to the busbar conductor 5 of the disconnector module 10C via the flange opening 11DK2 of the pressure tank 11D. Although each of the left and right busbar connecting conductors 31 appears to be a single busbar connecting conductor 31 in Fig. 5, in reality, three busbar connecting conductors 31 are lined up toward the back of the page.

[0029] Fig. 6 is a single-line diagram of the gas-insulated switchgear 100. The two circuits on the left side represent two disconnectors 20A and 20B, and the circuit on the right side represents a disconnector 20C and a circuit breaker 40, with the modules connected to each other by bus conductors 5. Cable terminals 4A and 4B correspond to a two-pole pull-in. In Fig. 6, cable terminal 4C is the side connected to the power source.

[0030] 1, the flange openings 11K2, 11DK2 of each disconnector module 10 and circuit breaker module 30 are connected to a cover 8 or adjacent flange portions 11F to ensure airtightness. Therefore, the interior of the gas-insulated switchgear 100 forms a single closed space 100R that is airtight from the outside. Furthermore, the disconnector 20, circuit breaker 40, and all conductors constituting the main circuit installed inside the pressure tanks 11A to 11D are insulated by pressurizing and sealing an insulating medium such as sulfur hexafluoride (SF6) gas or dry air inside each of the pressure tanks 11A to 11D.

[0031] As shown in FIG. 1 , each disconnecting switch 20 or circuit breaker 40 is housed in a cylindrical pressure tank 11, and each opening of the pressure tank 11 is connected to a lid 8 or flange portions 11AF to 11DF having a plate thickness equal to or greater than that of the pressure tank 11, thereby firmly fixing them to each other against the internal pressure of the insulating medium pressurized and sealed inside the pressure tank 11, thereby ensuring airtightness inside the gas-insulated switchgear 100.

[0032] For example, compared to the box-shaped pressure tank of Patent Document 1 manufactured from stainless steel with a plate thickness of approximately 6 mm, the pressure tank 11 of this embodiment, cast from aluminum with a plate thickness of approximately 20 mm, is expected to have 10 times the pressure resistance. In other words, the pressure tank 11 can be used with an increased insulating medium pressure without significantly increasing the external dimensions of the pressure tank 11 to ensure the insulation distance between each component. This makes it possible to use dry air as the insulating medium, which has a low global warming potential but requires a high charged pressure to achieve sufficient insulating performance. Furthermore, since the plate thickness of the pressure tank 11 can be reduced, the manufacturing cost of the gas-insulated switchgear 100 can be reduced.

[0033] According to the gas-insulated switchgear of embodiment 1, the gas-insulated switchgear comprises a plurality of disconnector modules and circuit breaker modules, wherein the disconnector module comprises a cylindrical first pressure tank having a first opening at one end in a central axis direction and the first opening being closed by a lid, and a disconnector disposed within the first pressure tank for opening and closing a main circuit in the central axis direction of the first pressure tank, the circuit breaker module comprises a cylindrical second pressure tank having a third opening at least at one end in a central axis direction and the third opening being closed by a lid, and a circuit breaker disposed within the second pressure tank for interrupting the main circuit in the central axis direction of the second pressure tank, the plurality of disconnector modules are disposed such that the central axes of the first pressure tanks are parallel to each other, the first pressure tank and the second pressure tank each have at least one second opening on a side surface, the second openings of adjacent disconnector modules and adjacent disconnector modules and circuit breaker modules are connected to each other, and all of the first pressure tanks and the second pressure tanks form a single enclosed space, Since the enclosed space is filled with insulating gas, it is possible to provide a small, inexpensive gas-insulated switchgear that can reduce the installation area even if the filling pressure of the insulating medium is increased.

[0034] Furthermore, since the plurality of disconnector modules include a plurality of bus conductors that extend perpendicularly to the central axis of the first pressure tank through the second opening, a gas-insulated switchgear with excellent expandability can be provided.

[0035] Furthermore, since the plurality of bus conductors are arranged parallel to and horizontally to one another, a gas-insulated switchgear that can accommodate a variety of equipment configurations can be provided simply by arranging and joining the disconnector modules.

[0036] Furthermore, since the plurality of bus conductors are supported from below by insulators arranged at the bottom of the first pressure tank, a highly stable gas-insulated switchgear can be provided.

[0037] Furthermore, the first pressure tank and the second pressure tank each have a flange portion at the second opening, and the flange portions are joined together, so that a plurality of disconnector modules and circuit breaker modules can be easily and firmly connected.

[0038] Furthermore, since the plurality of disconnector modules are arranged so that the central axes of the first pressure tanks are horizontal to one another, it is possible to provide a gas-insulated switchgear that is highly stable when installed.

[0039] Furthermore, since the circuit breaker module is arranged so that its central axis is perpendicular to the central axis of the disconnector module, a gas insulated switchgear requiring a small installation space can be provided.

[0040] Embodiment 2. A gas-insulated switchgear 200 according to embodiment 2 will now be described, focusing on the differences from embodiment 1. Fig. 7 is a schematic perspective view showing the configuration of a disconnector module 210. Fig. 7 is a schematic perspective view of the disconnector module 210 viewed in the same direction as Fig. 2. Fig. 7 shows a state in which the main circuit is closed.

[0041] In the first embodiment, the insulators 19 arranged inside the pressure tank 11A were aligned in the direction of the central axis PA of the pressure tank 11A in Fig. 2. The three bus conductors 5 were also structured to be supported horizontally from below by the insulators 19. In the second embodiment, the three insulators 19 are aligned parallel to each other and perpendicular to the ground inside the innermost curved wall 211L of the pressure tank 211.

[0042] The three bus conductors 5 are supported laterally by insulators 19 and are arranged perpendicular to the ground and parallel to one another. That is, the bus conductors 5 extend parallel to one another from the front of the paper to the back of the paper in Fig. 7. As shown in Fig. 7, the three bus conductors 5 are connected to the three bus-side conductors 13 by main circuit conductors 217, respectively.

[0043] The bus-side conductor 13 has connection locations for the main circuit conductors 217 connected to the bus conductors 5 on the bottom surface 13U in addition to the back surface. In Fig. 7, two main circuit conductors 217 are connected to the back surface of the bus-side conductor 13, and one main circuit conductor 217 is connected to the bottom surface 13U of the bus-side conductor 13.

[0044] As shown in Figure 7, by arranging the bus conductors 5 in a row perpendicular to the ground, it is possible to reduce the dimension of the pressure tank 211 in the central axis direction within a range that ensures the insulation distance between the bus conductors 5 and the insulators 19, which contributes to reducing the dimensions required to install the gas-insulated switchgear 200.

[0045] According to the gas-insulated switchgear of the second embodiment, the bus conductors are arranged parallel to each other and perpendicular to the ground, so that the dimension of the pressure tank in the central axis direction can be reduced.

[0046] Furthermore, according to the gas-insulated switchgear of embodiment 2, the bus conductors are supported from the sides by insulators arranged on the wall of the first pressure tank on the opposite side of the central axis from the first opening, so that the pressure tank can be made smaller while ensuring the insulation distance.

[0047] Furthermore, according to the gas-insulated switchgear of embodiment 2, the disconnector module includes three of the bus conductors, three bushings that connect the disconnector to external equipment, and three main circuit conductors that connect the three bus-side conductors of the disconnector to the bus conductors, respectively, and at least one of the three main circuit conductors is arranged on the bottom surface of the bus-side conductor of the disconnector, thereby enabling the size of the pressure tank to be further reduced.

[0048] Embodiment 3. A gas-insulated switchgear 300 according to embodiment 3 will be described below, focusing on the differences from embodiments 1 and 2. Fig. 8 is a schematic perspective view showing the configuration of a disconnector module 310. Fig. 8 is a schematic perspective view of the disconnector module 310 viewed in the same direction as Fig. 2. Fig. 8 shows a state in which the main circuit is closed.

[0049] As shown in Fig. 8, the pressure tank 311 differs from the pressure tanks 11 and 211 described in the first and second embodiments in that the bus conductors 5 are placed on insulators 19 placed directly below (or below) the bus conductors 13, and the bottom surfaces 13U of the bus conductors 13 and the bus conductors 5 are connected by main circuit conductors 17. The three bus conductors 5 are supported from below by the insulators 19 so as to be horizontal and parallel to each other.

[0050] 8, by accommodating the bus conductor 5 in the space directly below the bus-side conductor 13, which was not occupied by any component in the circuit configuration of embodiment 1, the depth dimension of the pressure tank 311 can be reduced to the extent that an insulation distance can be secured between the input / output conductor 18 and the bus conductor 5, thereby making it possible to further reduce the installation area compared to embodiment 2. The reduction in the volume of the pressure tank 211 can also contribute to a reduction in the amount of insulating medium used to seal it in.

[0051] According to the gas-insulated switchgear of embodiment 3, the disconnector module comprises three of the bus conductors, three bushings that connect the disconnector to external equipment, and three main circuit conductors that connect the three bus-side conductors of the disconnector to the bus conductors, respectively, and the three main circuit conductors are arranged below the bus-side conductors of the disconnector, and the three bus conductors are arranged parallel to and horizontally relative to each other, which makes it possible to make the pressure tank smaller and reduce the amount of insulating medium used to be sealed inside.

[0052] Embodiment 4. A gas-insulated switchgear 400 according to embodiment 4 will now be described, focusing on the differences from embodiment 3. Fig. 9 is a schematic perspective view showing the configuration of a disconnector module 410. Fig. 9 is a schematic perspective view of the disconnector module 410 as seen in the same direction as Fig. 2. Fig. 9 shows a state in which the main circuit is closed.

[0053] As shown in Fig. 9 , the pressure tank 411 is configured such that the bus conductors 5 are arranged directly below (or below) the bus-side conductors 13 in comparison with the pressure tank 311 described in the third embodiment, with the three conductors being arranged at the vertices of a triangle in the schematic perspective view of Fig. 9 . That is, of the three bus conductors 5, the two bus conductors 5 arranged on both sides are arranged horizontally relative to each other, and the central bus conductor 5 is arranged lower than the other two bus conductors 5. The bottom surface 13U of the bus-side conductor 13 and the bus conductor 5 are connected by the main circuit conductor 17.

[0054] In this structure, the diameter of the opening 411K2 on the side of the pressure tank 411 is reduced within a range that ensures the insulation distance between the three bus conductors 5 and the insulation distance between the bus conductors 5 and the pressure tank 411. In addition, although the triangular arrangement of the bus conductors 5 is illustrated as an example in which only the central bus conductor 5 in the direction of the central axis P is arranged vertically downward, a triangular arrangement in which only the central bus conductor 5 in the direction of the central axis P is arranged vertically upward may also be used.

[0055] 9, by arranging the bus conductors 5 in a triangle, the diameter of the opening 411K2 of the pressure tank 411 can be reduced compared to Embodiment 3, thereby reducing the stress applied to the flange portions, which are the connecting portions between the modules, due to the internal pressure of the disconnector module 410 and the circuit breaker module 30. This reduces the axial force required to connect the flange portions, thereby reducing the number and size of the fastening bolts between the modules.

[0056] According to the gas-insulated switchgear of embodiment 4, the disconnector module comprises the three bus conductors, three bushings that connect the disconnector to external equipment, and three main circuit conductors that connect the three bus-side conductors of the disconnector to the bus conductors, respectively; the three main circuit conductors are arranged below the bus-side conductors of the disconnector; the three bus conductors are parallel to each other, and the two bus conductors arranged on both outer sides are arranged horizontally to each other; and the one bus conductor arranged in the center is arranged higher or lower than the other two bus conductors. This makes it possible to reduce the diameter of the opening of the pressure tank, thereby reducing the number of components and lowering the manufacturing cost of the gas-insulated switchgear.

[0057] Although various exemplary embodiments and examples are described in this disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are anticipated within the scope of the technology disclosed in this specification. For example, this includes cases where at least one component is modified, added, or omitted, or where at least one component is extracted and combined with components of another embodiment.

[0058] 100, 200, 300, 400 Gas-insulated switchgear, 10, 10A, 10B, 10C, 210, 310, 410 Disconnector module, 11, 11A, 11B, 11C, 11D, 211, 311, 411 Pressure tank, 11F, 11AF, 11BF, 11CF, 11DF Flange portion, 11K2, 11AK2, 11BK2, 11CK2, 11DK2 Flange opening, 11K, 11DK, 411K2 Opening, 11L, 211L Wall, 12 Cable side conductor, 13 Bus side conductor, 14 Conductor blade, 15 Insulation support portion, 16 Bushing, 17, 217 Main circuit conductor, 18 Input / output conductor, 19 Insulator, 20, 20A, 20B, 20C Disconnector, 30 Circuit breaker module, 31 Busbar connection conductor, 32 Operation section, 4, 4A, 4B, 4C Cable terminal, 40 Circuit breaker, 5 Busbar conductor, 8, 82 Lid, 81 Lid penetration part, 9 Disconnector operation mechanism, 91 Drive shaft, M Groove, P, PA, PB, PC, PD Center shaft, R1, R2 O-ring.

Claims

1. A gas-insulated switchgear comprising a plurality of circuit breaker modules and a disconnector module, wherein each of the circuit breaker modules has a first opening at one end in the central axis direction, and includes a cylindrical first pressure tank with the first opening closed by a lid, and a circuit breaker disposed in the first pressure tank for opening and closing the main circuit in the central axis direction of the first pressure tank; the disconnector module has a third opening at least at one end in the central axis direction, and includes a cylindrical second pressure tank with the third opening closed by a lid, and a disconnector disposed in the second pressure tank for interrupting the main circuit in the central axis direction of the second pressure tank; the plurality of circuit breaker modules are arranged such that the central axes of the first pressure tanks are parallel to each other; the first pressure tank and the second pressure tank each have at least one second opening on the side surface; adjacent circuit breaker modules and adjacent circuit breaker modules and the disconnector module connect the second openings to form a closed space for all the first pressure tanks and the second pressure tanks, and an insulating gas is enclosed in the closed space.

2. The gas-insulated switchgear according to claim 1, wherein the plurality of circuit breaker modules include a plurality of bus conductors extending perpendicular to the central axis of the first pressure tank through the second opening.

3. The gas-insulated switchgear according to claim 2, wherein the plurality of bus conductors are arranged parallel to each other and horizontally.

4. The gas-insulated switchgear according to claim 2, wherein the plurality of bus conductors are arranged parallel to each other and perpendicular to the ground.

5. The gas-insulated switchgear according to claim 3, wherein the plurality of bus conductors are supported from below by insulators disposed at the bottom of the first pressure tank.

6. The gas-insulated switchgear according to claim 4, wherein the plurality of bus conductors are supported laterally by insulators disposed on the wall of the first pressure tank on the side opposite to the first opening in the central axis direction.

7. The circuit breaker module includes three of the bus conductors, three bushings for connecting the circuit breaker to external equipment, and three main circuit conductors for connecting the three bus-side conductors of the circuit breaker to the bus conductors respectively, and at least one of the three main circuit conductors is disposed on the bottom surface of the bus-side conductor of the circuit breaker.

8. The circuit breaker module includes three of the bus conductors, three bushings for connecting the circuit breaker to external devices, and three main circuit conductors for connecting the three bus-side conductors of the circuit breaker to the bus conductors respectively. The three main circuit conductors are arranged below the bus-side conductors of the circuit breaker. The three bus conductors are arranged parallel to each other and horizontally with respect to each other. The gas-insulated switchgear according to claim 2.

9. The circuit breaker module includes three of the bus conductors, three bushings for connecting the circuit breaker to external devices, and three main circuit conductors for connecting the three bus-side conductors of the circuit breaker to the bus conductors respectively. The three main circuit conductors are arranged below the bus-side conductors of the circuit breaker. The three bus conductors are arranged parallel to each other, and the two bus conductors arranged on both outer sides are arranged horizontally with respect to each other. The one bus conductor arranged in the center is arranged above or below the other two bus conductors. The gas-insulated switchgear according to claim 2.

10. The first pressure tank and the second pressure tank each include a flange portion at each of the second openings, and the flange portions are joined to each other. The gas-insulated switchgear according to any one of claims 1 to 9.

11. The plurality of circuit breaker modules are arranged such that the central axes of the first pressure tanks are horizontal with respect to each other. The gas-insulated switchgear according to any one of claims 1 to 10.

12. The disconnector module is arranged such that the central axis is perpendicular to the central axis of the circuit breaker module. The gas-insulated switchgear according to any one of claims 1 to 11.

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