Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
  • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
  • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
  • H02B13/035—Gas-insulated switchgear

Definitions

• This disclosure relates to gas-insulated switchgear.
• Gas-insulated switchgear is a type of 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)).
• a highly insulating gas e.g., sulfur hexafluoride (SF6)
• Gas-insulated switchgear contributes to reducing the space required for installation by making the devices more compact thanks 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.
• the GWP value and insulating performance are generally inversely proportional, so the insulating distance of the internal equipment and main circuit conductors must be increased, which increases the volume of the pressure tank.
• the external dimensions of the gas-insulated switchgear also increase, restricting the locations where it can be installed.
• measures such as increasing the thickness of the steel plates that make up the pressure tank or adding reinforcement are necessary to prevent deformation of the pressure tank due to an increase in internal pressure, which poses the problem of increasing the manufacturing costs of the gas-insulated switchgear.
• This disclosure discloses technology to solve the above-mentioned problems, and aims to provide an inexpensive gas-insulated switchgear that can reduce the installation area even if the insulating medium filling pressure increases.
• the gas insulated switchgear shown in the present disclosure is A gas-insulated switchgear comprising a plurality of disconnector modules and circuit breaker modules
• the disconnector module includes a cylindrical first pressure tank having a first opening at one end in a central axis direction, the first opening being closed by a lid, and a disconnector disposed in the first pressure tank and configured to open and close a main circuit in the central axis direction of the first pressure tank
• the circuit breaker module includes a cylindrical second pressure tank having a third opening at least at one end in a central axis direction, the third opening being closed by a lid, and a circuit breaker disposed in the second pressure tank and interrupting a main circuit in the central axis direction of the second pressure tank
• the plurality of disconnector 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 in a side surface; adjacent disconnector modules and adjacent disconnector modules and circuit breaker modules connect the second opening
• the gas-insulated switchgear disclosed herein makes it possible to provide a small, inexpensive gas-insulated switchgear that can reduce the installation area even when the insulating medium filling pressure is increased.
• FIG. 1 is a front view of a gas-insulated switchgear according to a first embodiment.
• FIG. 1 is a perspective schematic diagram showing a configuration of a disconnector module according to a first embodiment.
• FIG. 1 is a perspective schematic diagram showing the configuration of a disconnector module according to a first embodiment.
• FIG. 1 is a top perspective view of a gas-insulated switchgear according to a first embodiment;
• 5 is a perspective schematic view of the circuit breaker module according to the first embodiment as viewed in the direction of arrow B in FIG. 4.
• 1 is a single-line diagram of a gas-insulated switchgear according to a first embodiment.
• FIG. FIG. 10 is a schematic perspective view showing the configuration of a disconnector module according to a second embodiment.
• FIG. 10 is a perspective schematic diagram showing the configuration of a disconnector module according to a third embodiment.
• FIG. 10 is a perspective schematic diagram showing the configuration of a disconnector module according to a fourth embodiment.
• FIG. 1 is a front view of a gas-insulated switchgear 100 according to a first embodiment.
• Fig. 2 is a schematic perspective view showing the configuration of the disconnector module 10 (10A).
• Fig. 2 is a schematic perspective view of the disconnector module 10 in 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 in 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. As shown in FIG.
• the gas-insulated switchgear 100 comprises three disconnector modules 10 and one circuit breaker module 30 .
• the disconnector modules 10A, 10B, and 10C have the same configuration.
• the power supply is connected to the disconnector module 10C, and therefore the direction of electrical energy flowing through the disconnector module 10C is opposite to that of the disconnector modules 10A and 10B.
• components with the letter A appended to their reference numerals refer to components of the disconnector module 10A.
• components with the letter B appended to their reference numerals refer to components of the disconnector module 10B
• components with the letter C appended to their reference numerals refer to components of the disconnector module 10C.
• Each disconnector module 10 is composed of 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 connected in series.
• Pressure tanks 11A, 11B, 11C are arranged so that their respective central axes PA, PB, PC are parallel and horizontal to one another, and have an opening 11K (first opening) shown in Figure 2 at one end in the direction of the central axes PA, PB, PC (the front side, towards the front of the paper in Figure 1).
• one disconnector 20A, 20B, 20C is installed inside each of pressure tanks 11A, 11B, 11C. Note that, although an example has been shown in which the respective central axes PA, PB, PC of pressure tanks 11A, 11B, 11C are horizontal to one another, this does not necessarily have to be horizontal.
• Pressure tank 11D (second pressure tank) is positioned 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 positioned 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 while 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.
• a circuit breaker 40 is installed inside the pressure tank 11D.
• 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. Note that there may be only one opening.
• the opening 11DK is closed by a lid 82.
• 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.
• the disconnector 20 comprises 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, input/output conductors 18, and an insulating support portion 15.
• 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.
• the disconnector operating mechanism 9, located outside the pressure tank 11, and a conductor blade 14, which serves as the 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.
• the space between the drive shaft 91 and the lid 8 is kept airtight at the lid penetration portion 81.
• 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 the conductor blade 14 that connects the main circuits via the disconnector operating mechanism 9.
• a bushing 16 for connecting the cable terminal 4 is attached to the bottom of the lid 8, hermetically sealed 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 on the pressure tank 11.
• FIG. 2 and 3 only show 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, three sets, i.e., three phases, are arranged from the front to the back of the paper in Figures 2 and 3, and one disconnector operating mechanism 9 drives the three drive shafts 91, disconnecting (opening and closing) the main circuits for three phases in the direction of the central axis P of the pressure tank 11.
• the three bus conductors 5 are each supported from below by an insulator 19 and are arranged side by side vertically and horizontally in the direction of the central axis of the pressure tank 11. That is, each bus conductor 5 extends horizontally from the front of the paper to the back of the paper in Figure 2, and is arranged parallel to one another as shown in Figure 4. As shown in Figures 2 and 3, the three bus conductors 5 and the three bus-side conductors 13 are each connected by a main circuit conductor 17.
• both sides of the pressure tank 11 are provided with fastening flange portions 11F (11AF, 11BF, 11CF, 11DF) having flange openings 11K2 (11AK2, 11BK2, 11CK2, 11DK2).
• a lid 82 is fastened to one flange portion 11AF of the pressure tank 11A, sealing the pressure tank 11 and ensuring airtightness inside.
• the other flange portion 11AF is fastened with bolts to one flange portion 11BF of the adjacent pressure tank 11B, joining the disconnector modules 10A and 10B together.
• FIG. 5 is a perspective schematic view of the circuit breaker module 30 as seen in the direction of arrow B in FIG.
• 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.
• 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.
• the other flange portion 11DF is fastened with bolts to the flange portion 11CF having one of the flange openings 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, sealing the pressure tank 11 and ensuring airtightness. Note that for 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.
• the gas-insulated switchgear 100 has a structure that allows any number of disconnector modules 10 and circuit breaker modules 30 to be selected and connected in series.
• the reason for arranging the circuit breaker modules vertically to the ground is to make efficient use of 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.
• one busbar connection conductor 31 is connected to the busbar conductor 5 that passes through the disconnector module 10B and the disconnector module 10A, passing through the flange opening 11DK2 of the pressure tank 11D and the flange opening 11BK2 of the pressure tank 11B.
• the other busbar connection conductor 31 is connected to the busbar conductor 5 of the disconnector module 10C, passing through the flange opening 11DK2 of the pressure tank 11D.
• the left and right busbar connection conductors 31 appear to be one each, but in reality, there are three busbar connection conductors 31 on each side lined up toward the back of the page.
• 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 each module connected by a bus conductor 5.
• Cable terminal 4A and cable terminal 4B correspond to a two-pole pull-in.
• cable terminal 4C is the side connected to the power source.
• each disconnector module 10 and circuit breaker module 30 of the gas-insulated switchgear 100 shown in Figure 1 are airtight by connecting the lid 8 or adjacent flange portions 11F. Therefore, the interior of the gas-insulated switchgear 100 forms a single enclosed space 100R that is airtight from the outside. Furthermore, the disconnectors 20, circuit breakers 40, and all conductors that make up the main circuits installed inside 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 pressure tank 11A to 11D.
• SF6 sulfur hexafluoride
• 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-11DF with a plate thickness equal to or greater than that of the pressure tank 11. This firmly secures the pressure tank 11 against the internal pressure of the insulating medium pressurized and sealed inside, ensuring airtightness inside the gas-insulated switchgear 100.
• the pressure tank 11 of this embodiment compared to the box-shaped pressure tank of Patent Document 1, which is manufactured from stainless steel with a plate thickness of approximately 6 mm, by casting the pressure tank 11 of this embodiment from aluminum with a thickness of approximately 20 mm, it is possible to expect 10 times the pressure resistance. In other words, it becomes possible to increase the charged pressure of the insulating medium 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 the required insulation performance. Furthermore, because the plate thickness of the pressure tank 11 can be made thinner, the manufacturing costs of the gas-insulated switchgear 100 can be reduced.
• a gas-insulated switchgear comprising a plurality of disconnector modules and circuit breaker modules
• the disconnector module includes a cylindrical first pressure tank having a first opening at one end in a central axis direction, the first opening being closed by a lid, and a disconnector disposed in the first pressure tank and configured to open and close a main circuit in the central axis direction of the first pressure tank
• the circuit breaker module includes a cylindrical second pressure tank having a third opening at least at one end in a central axis direction, the third opening being closed by a lid, and a circuit breaker disposed in the second pressure tank and interrupting a main circuit in the central axis direction of the second pressure tank
• the plurality of disconnector 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 in a side surface; adjacent disconnector modules and adjacent disconnector modules and circuit breaker modules connect the second openings to each
• the plurality of disconnector modules include a plurality of bus conductors extending perpendicular to the central axis of the first pressure tank through the second opening, A gas-insulated switchgear with excellent expandability can be provided.
• first pressure tank and the second pressure tank each include a flange portion at the second opening, Since the flange portions are joined together, a plurality of disconnector modules and circuit breaker modules can be easily and firmly connected.
• the plurality of disconnector modules are arranged such that the central axes of the first pressure tanks are horizontal to each other, It is possible to provide a gas-insulated switchgear that is highly stable when installed.
• circuit breaker module is arranged so that its central axis is perpendicular to the central axis of the disconnector module, It is possible to provide a gas-insulated switchgear that requires a small installation space.
• Fig. 7 is a schematic perspective view showing the configuration of the 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.
• the insulators 19 arranged inside the pressure tank 11A are aligned in the direction of the central axis PA of the pressure tank 11A in Fig. 2.
• the three bus conductors 5 are horizontally supported from below by the insulators 19.
• three insulators 19 are arranged inside the innermost curved wall 211L of the pressure tank 211, parallel to each other and perpendicular to the ground.
• the three bus conductors 5 are supported laterally by insulators 19 and are arranged perpendicular to the ground and parallel to one another. In other words, the bus conductors 5 extend parallel to one another from the front of the paper in Figure 7 to the back of the paper. As shown in Figure 7, the three bus conductors 5 are connected to the three bus-side conductors 13 by main circuit conductors 217, respectively.
• the bus conductor 13 has connection locations for the main circuit conductors 217 that connect to the bus conductor 5 on its back surface as well as its bottom surface 13U.
• two main circuit conductors 217 are connected to the back surface of the bus conductor 13, and one main circuit conductor 217 is connected to the bottom surface 13U of the bus conductor 13.
• the plurality of bus conductors are arranged parallel to each other and perpendicular to the ground, The dimension of the pressure tank in the direction of its central axis can be reduced.
• the plurality of bus conductors are supported from the sides by insulators arranged on a wall of the first pressure tank opposite to the first opening in the central axis direction.
• the pressure tank can be made smaller while maintaining the insulation distance.
• the disconnector module includes three bus conductors; three bushings for connecting the disconnector to external equipment; three main circuit conductors connecting the three bus-side conductors of the disconnector to the bus conductors, respectively; At least one of the three main circuit conductors is disposed on the bottom surface of the bus-side conductor of the disconnector, The size of the pressure tank can be further reduced.
• Fig. 8 is a schematic perspective view showing the configuration of the 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.
• the pressure tank 311 differs from the pressure tanks 11 and 211 described in embodiments 1 and 2 in that the bus conductors 5 are placed on insulators 19 placed directly below (or below) the bus conductors 13, and the bottom surface 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 that they are horizontal and parallel to each other.
• the depth dimension of the pressure tank 311 can be reduced to the extent that an insulation distance can be ensured between the input/output conductor 18 and the bus conductor 5, making it possible to further reduce the installation area compared to embodiment 2. Reducing the volume of the pressure tank 211 also contributes to reducing the amount of insulating medium used to seal it in.
• the disconnector module includes three bus conductors; three bushings for connecting the disconnector to external equipment; three main circuit conductors connecting the three bus-side conductors of the disconnector to the bus conductors, respectively; the three main circuit conductors are arranged below the bus-side conductor of the disconnector; The three bus conductors are arranged parallel to each other and horizontally to each other, The pressure tank can be made smaller, reducing the amount of insulating medium used.
• Fig. 9 is a schematic perspective view showing the configuration of the disconnector module 410.
• Fig. 9 is a schematic perspective view of the disconnector module 410 viewed in the same direction as Fig. 2.
• Fig. 9 shows a state in which the main circuit is closed.
• the pressure tank 411 compared to the pressure tank 311 described in embodiment 3, has bus conductors 5 placed directly below (or below) the bus conductors 13, with the three conductors being arranged at the vertices of a triangle in the perspective schematic diagram of Figure 9.
• the three bus conductors 5 the two bus conductors 5 located 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 conductors 13 and the bus conductors 5 are connected by the main circuit conductor 17.
• the diameter of the opening 411K2 on the side of the pressure tank 411 has been reduced to the extent that the insulation distance between the three bus conductors 5 and the insulation distance between the bus conductors 5 and the pressure tank 411 can be ensured. Furthermore, while 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 is also possible.
• 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 flanges, which are the connecting parts between the modules, due to the internal pressure of the disconnector module 410 and the circuit breaker module 30.
• the disconnector module includes three bus conductors; three bushings for connecting the disconnector to external equipment; three main circuit conductors connecting the three bus-side conductors of the disconnector to the bus conductors, respectively; the three main circuit conductors are arranged below the bus-side conductor of the disconnector; The three bus conductors are parallel to each other and the two outer bus conductors are arranged horizontally relative to each other; Since the one bus conductor arranged in the center is arranged higher or lower than the other two bus conductors, Since the diameter of the opening of the pressure tank can be reduced, the number of components can be reduced, thereby reducing the manufacturing cost of the gas-insulated switchgear.

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