Cutout gear

Abstract

To provide a cutout gear having sufficient breakdown voltage performance even in the case of using a vacuum circuit breaker.SOLUTION: In a cutout gear of an embodiment, a first cutout contact is connected to a power conduction contact in parallel, and a second cutout contact is connected to a power conduction contact in parallel, and is connected in serial to the first cutout contact. The first cutout contact is constructed by a vacuum circuit breaker, and the second cutout contact and the power conduction contact are constructed by a gas breaker. When executing a cable way injection operation so as to make a cable way to a power conduction state from a cutout state, a first cutout contact injection operation, a second cutout contact injection operation, and a power conduction contact injection operation are executed. The completion point of the first cutout contact injection operation is before the completion point of the second cutout contact injection operation, and the completion point of the second cutout contact injection operation is before the completion point of the power conduction contact injection operation.SELECTED DRAWING: Figure 2A

Description

Technical Field

[0001] Embodiments of the present invention relate to a circuit breaker.

Background Art

[0002] In the event of an accident in the power system, a circuit breaker such as a vacuum circuit breaker or a gas circuit breaker is used to switch the circuit through which current flows from the energized state to the interrupted state.

[0003] A vacuum circuit breaker is configured to perform an opening and closing operation on a pair of contacts (electrodes) inside a vacuum vessel in a vacuum state. Specifically, when the circuit is energized, the pair of contacts approach each other in a vacuum atmosphere in the vacuum circuit breaker, and the closed state is achieved to establish an electrical connection state. When the circuit is interrupted, the pair of contacts in the vacuum circuit breaker separate from each other in a vacuum atmosphere to enter the open state and establish an electrical insulation state.

[0004] A gas circuit breaker is configured to perform an opening and closing operation on a pair of contacts inside a grounded vessel filled with an insulating gas. Specifically, when the circuit is energized, the pair of contacts approach each other in an atmosphere filled with an insulating gas in the gas circuit breaker, and the closed state is achieved to establish an electrical connection state. When the circuit is interrupted, the pair of contacts in the gas circuit breaker separate from each other in an atmosphere filled with an insulating gas to enter the open state and establish an electrical insulation state. In the gas circuit breaker, when the interruption operation of switching from the closed state to the open state is performed, for example, the insulating gas is blown onto the arc discharge generated during the interruption operation to extinguish the arc discharge.

[0005] In a gas circuit breaker, mainly SF6 gas (sulfur hexafluoride gas) is used as the insulating gas in order to sufficiently obtain performance such as insulation performance and arc extinction performance. Since the gas circuit breaker has excellent performance such as insulation performance and arc extinction performance, it can be preferably used for a circuit (such as a transmission class circuit) to which a higher voltage than the circuit interrupted by the vacuum circuit breaker is applied.

Prior Art Documents

Patent Document

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] SF6 gas, which is mainly used as an insulating gas in gas circuit breakers, has a high global warming potential. For this reason, technologies using insulating gases other than SF6 gas have been proposed, but it is not easy to obtain sufficient performance. Specifically, when a natural gas such as dry air is used as an insulating gas instead of SF6 gas in a gas circuit breaker, the arc extinguishing ability to extinguish arc discharge is low, so the interruption performance may decrease.

[0008] For this reason, it has been considered to configure a switching device by combining a gas circuit breaker and a vacuum circuit breaker. However, in a switching device configured by combining a gas circuit breaker and a vacuum circuit breaker, the following problems may occur.

[0009] Specifically, when a pre-arcing discharge occurs between a pair of contacts constituting a vacuum circuit breaker in order to execute an energizing operation of changing the vacuum circuit breaker from an open state to a closed state, the metal material constituting the pair of contacts is melted by the pre-arcing discharge. As a result, in the vacuum circuit breaker, the space between the pair of contacts may be in a state where they are partially welded. For this reason, when an interruption operation of changing the vacuum circuit breaker from a closed state to an open state is then executed, the welded portion of the pair of contacts constituting the vacuum circuit breaker is peeled off, so the surfaces of the pair of contacts are roughened. When the surface of the contacts in a vacuum circuit breaker is roughened, the electron multiplication factor increases and electron avalanche is likely to occur, so the withstand voltage performance of the vacuum circuit breaker may decrease.

[0010] Due to the above circumstances, in a circuit breaker configured by combining a gas circuit breaker and a vacuum circuit breaker, it is not easy to improve the withstand voltage performance of the entire circuit breaker due to the deterioration of the withstand voltage performance of the vacuum circuit breaker.

[0011] Therefore, the problem to be solved by the present invention is to provide a circuit breaker that has sufficient withstand voltage performance even when a vacuum circuit breaker is used.

Means for Solving the Problem

[0012] The circuit breaker of the embodiment has a power conduction contact, a first interruption contact, and a second interruption contact. The first interruption contact is connected in parallel with the power conduction contact. The second interruption contact is connected in parallel with the power conduction contact and is also connected in series with the first interruption contact. The first interruption contact is constituted by a vacuum circuit breaker that switches between a closed state and an open state inside a vacuum container. The second interruption contact and the power conduction contact are constituted by a gas circuit breaker that switches between a closed state and an open state inside an insulating gas container filled with an insulating gas. When the circuit breaker of the embodiment executes a circuit closing operation to change the circuit from an interrupted state to a power-conducting state, it executes a first interruption contact closing operation to change the first interruption contact from an open state to a closed state, a second interruption contact closing operation to change the second interruption contact from an open state to a closed state, and a power conduction contact closing operation to change the power conduction contact from an open state to a closed state. The completion time of the first interruption contact closing operation is before the completion time of the second interruption contact closing operation, and the completion time of the second interruption contact closing operation is before the completion time of the power conduction contact closing operation. When the first interruption contact closing operation and the second interruption contact closing operation are completed, current flows through the first interruption contact and the second interruption contact, and when the power conduction contact closing operation is completed, a larger current flows through the power conduction contact than through the first interruption contact and the second interruption contact.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2A

Figure 2B

Figure 3A

Figure 3B

Figure 3C

Figure 4A

Figure 4B

Figure 5

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 9

Embodiments for Carrying Out the Invention

[0014] <First Embodiment> [A] Circuit of the Interrupting Device 100 FIG. 1 is a circuit diagram of the interrupting device 100 according to the first embodiment.

[0015] As shown in FIG. 1, the interrupting device 100 of the present embodiment is a device having a power supply contact 101, a first interrupting contact 111, and a second interrupting contact 112, and is installed in the electric circuit EC, and is configured to switch the electric circuit EC from an energized state to an interrupted state. Here, the interrupting device 100 includes a power supply electric circuit EC1 and an interrupting electric circuit EC2 as the electric circuit EC, and the interrupting electric circuit EC2 is connected in parallel to the power supply electric circuit EC1 so as to bypass the power supply contact 101.

[0016] Hereinafter, each part constituting the interrupting device 100 will be sequentially described. Note that FIG. 1 shows a state in which the interrupting device 100 has switched the electric circuit EC to the interrupted state.

[0017] [A-1] Power Supply Contact 101 The power supply contact 101 is installed in the power supply electric circuit EC1. The power supply contact 101 is configured to have a smaller resistance than the first interrupting contact 111 and the second interrupting contact 112. For example, the power supply contact 101 is configured to have a larger current-carrying cross-sectional area than the first interrupting contact 111 and the second interrupting contact 112, and to use a conductive material having a higher conductivity than the first interrupting contact 111 and the second interrupting contact 112.

[0018] [A-2] First Interrupting Contact 111 The first interrupting contact 111 is installed in the interrupting electric circuit EC2 so as to be connected in parallel with the power supply contact 101.

[0019] [A-3] Second Interrupting Contact 112 The second cutoff contact 112 is installed in the cutoff circuit EC2 so as to be connected in series with the first cutoff contact 111 while being connected in parallel with the energized contact 101.

[0020] [B] Detailed Configuration of the Cutoff Device 100 FIG. 2A is a cross-sectional view schematically showing the configuration of the cutoff device 100 according to the first embodiment. In FIG. 2A, the state where the cutoff device 100 is in the cutoff state is shown.

[0021] As shown in FIG. 2A, the cutoff device 100 of the present embodiment houses a vacuum circuit breaker 211 and a gas circuit breaker 251 inside a grounding tank 200. Each part constituting the cutoff device 100 will be described sequentially.

[0022] [B-1] Grounding Tank 200 The grounding tank 200 is formed of a metal material and is electrically connected to a reference electric potential point (such as the ground). The inside of the grounding tank 200 is filled with an insulating gas.

[0023] Here, the insulating gas is, for example, a gas having a lower greenhouse effect coefficient than SF6 gas, but it may also be SF6 gas. The insulating gas having a smaller greenhouse effect coefficient than SF6 gas is, for example, a gas such as carbon dioxide, oxygen, nitrogen, or a mixed gas in which the above-mentioned gases are mixed.

[0024] [B-2] Vacuum Circuit Breaker 211 (First Cutoff Contact 111) The vacuum circuit breaker 211 is a vacuum valve, and houses a movable electrode 111A and a fixed electrode 111B as the first cutoff contact 111 inside a vacuum container 212. The vacuum circuit breaker 211 is configured such that the first cutoff contact 111 switches between a closed state and an open state inside the vacuum container 212.

[0025] Here, the vacuum vessel 212 includes a choke tube 212a and a pair of flanges 212b. For example, each of the pair of flanges 212b is installed at both ends of the cylindrical choke tube 212a. The choke tube 212a is formed of an insulating material (such as ceramic), and the pair of flanges 212b are formed of a metal material, for example. The inside of the vacuum vessel 212 is in a vacuum state, and the pressure inside the vacuum vessel 212 is lower than the pressure inside the grounding tank 200.

[0026] The movable electrode 111A and the fixed electrode 111B are, for example, disc-shaped and formed of a metal material, and are installed inside the vacuum vessel 212 such that their ends face each other. Here, the movable electrode 111A is installed at the end of the vacuum circuit breaker movable current-carrying shaft 214. And the fixed electrode 111B is installed at the end of the vacuum circuit breaker fixed current-carrying shaft 213. The vacuum circuit breaker fixed current-carrying shaft 213 is installed so as to be coaxial with the vacuum circuit breaker movable current-carrying shaft 214. The vacuum circuit breaker fixed current-carrying shaft 213 is supported by a support portion SP formed of an insulating material.

[0027] Also, the vacuum circuit breaker movable current-carrying shaft 214 is connected to the operating mechanism 217 via an insulating rod 216. The operating mechanism 217 is configured to operate the vacuum circuit breaker movable current-carrying shaft 214 using, for example, an electric spring or an electromagnetic repulsion mechanism. The vacuum circuit breaker 211 is in a closed state when the movable electrode 111A and the fixed electrode 111B are in contact with each other due to the operation of the operating mechanism 217, and is in an open state when the movable electrode 111A and the fixed electrode 111B are separated from each other.

[0028] The vacuum circuit breaker movable current-carrying shaft 214 is slidably supported by a sliding portion SL214. The sliding portion SL214 is formed of a metal material and is electrically connected to the electric wire EC1a via the electric wire EC2a interposed therebetween. The electric wire EC2a constitutes a cutoff circuit EC2 (see FIG. 1).

[0029] Inside the vacuum vessel 212, a bellows 215 and an arc shield 218 are further accommodated.

[0030] The bellows 215 is cylindrical and penetrated by the vacuum circuit breaker movable energization shaft 214. The internal space of the bellows 215 communicates with the internal space of the grounding tank 200. The bellows 215 is configured to expand and contract in the moving direction when the movable electrode 111A moves along with the sliding of the vacuum circuit breaker movable energization shaft 214.

[0031] The arc shield 218 is installed so as to surround the movable electrode 111A and the fixed electrode 111B in the circumferential direction.

[0032] [B-3] Gas circuit breaker 251 (energization contact 101, second interruption contact 112) As shown in Fig. 2A, the gas circuit breaker 251 includes a gas circuit breaker movable energization shaft 401 and a gas circuit breaker fixed energization shaft 253. A driving-side arc contact 451 and a driving-side energization contact 455 are provided on the gas circuit breaker movable energization shaft 401. The gas circuit breaker fixed energization shaft 253 is arranged coaxially with the gas circuit breaker movable energization shaft 401, and an opposing-side arc contact 331 and an opposing-side energization contact 335 are provided. The gas circuit breaker fixed energization shaft 253 is integrally formed with the vacuum circuit breaker fixed energization shaft 213 and is supported by the support portion SP.

[0033] In the gas circuit breaker 251, the driving-side energization contact 455 and the opposing-side energization contact 335 function as the energization contact 101. And in the gas circuit breaker 251, the driving-side arc contact 451 and the opposing-side arc contact 331 function as the second interruption contact 112.

[0034] Fig. 2B is a cross-sectional view showing the detailed configuration of the gas circuit breaker 251 in the interruption device 100 according to the first embodiment. Hereinafter, in addition to Fig. 2A, the detailed configuration of the gas circuit breaker 251 will be described with reference to Fig. 2B.

[0035] The gas circuit breaker 251 is of the buffer type and includes an opposing-side unit 3 and a driving-side unit 4 as shown in Fig. 2B.

[0036] [B-3-1] Opposite-side Unit 3 In the gas circuit breaker 251, the opposite-side unit 3 includes a cooling cylinder 301, a support portion 302, and an opposite-side contact portion 303. Each of the cooling cylinder 301, the support portion 302, and the opposite-side contact portion 303 is formed of, for example, a metal material, and each is electrically connected to the electric wire EC1a (see FIG. 2A).

[0037] [B-3-1-1] Cooling Cylinder 301 The cooling cylinder 301 is, for example, a cylindrical tubular body and is connected to the electric wire EC1a. The cooling cylinder 301 is supported by the grounding tank 200 by the support portion SP (see FIG. 2A).

[0038] [B-3-1-2] Support Portion 302 The support portion 302 includes a support ring portion 321 and a support protrusion 322.

[0039] The support ring portion 321 is, for example, an annular ring-shaped body and is coaxially installed on the end surface located on the driving side DS in the cooling cylinder 301. Here, the outer diameter of the support ring portion 321 is, for example, the same as the outer diameter of the cooling cylinder 301, and the inner diameter of the support ring portion 321 is, for example, the same as the inner diameter of the cooling cylinder 301.

[0040] The support protrusion 322 is, for example, a rod-shaped body and is provided so as to protrude radially inward on the inner peripheral surface of the support ring portion 321. In the support portion 302, the support ring portion 321 is formed using a conductive material such as metal. On the other hand, the support protrusion 322 is formed using an insulating material in order to electrically insulate between the opposite-side arc contact 331 and the opposite-side energizing contact 335 by the support protrusion 322. However, a part of the support protrusion 322 is formed using a conductive material so as to electrically connect between the gas circuit breaker fixed energizing shaft 253 and the opposite-side arc contact 331 (see FIG. 1).

[0041] [B-3-1-3] Opposite-side contact part 303 The opposite-side contact part 303 includes an opposite-side arc contact 331 and an opposite-side energizing contact 335, and is provided inside the grounding tank 200.

[0042] [B-3-1-3-1] Opposite-side arc contact 331 The opposite-side arc contact 331 is, for example, a columnar rod-shaped body that extends in the axial direction. The opposite-side arc contact 331 is coaxially installed on the surface of the support protrusion 322 that is located on the driving side DS, together with the cooling cylinder 301 and the like. The end 331a of the opposite-side arc contact 331 that is located on the driving side DS is a curved surface.

[0043] [B-3-1-3-2] Opposite-side energizing contact 335 The opposite-side energizing contact 335 is, for example, a cylindrical tubular body that is coaxially installed on the end face of the cooling cylinder 301 that is located on the driving side DS, via the support part 302, together with the opposite-side arc contact 331 and the like. The opposite-side energizing contact 335 includes a part that houses the opposite-side arc contact 331 inside.

[0044] Here, the outer diameter of the opposite-side energizing contact 335 is, for example, the same as the outer diameter of the cooling cylinder 301, and the inner diameter of the opposite-side energizing contact 335 includes, for example, the same part as the inner diameter of the cooling cylinder 301. At the opposite-side energizing contact 335, the end 335a that is located on the driving side DS protrudes inward in the radial direction.

[0045] [B-3-2] Driving-side unit 4 The driving-side unit 4 includes a gas circuit breaker movable energizing shaft 401 (movable energizing shaft), a buffer cylinder 402, a buffer piston 403, a driving-side contact part 405, a cylinder support 406, a piston support 407, and an insulating nozzle 500. Each of the gas circuit breaker movable energizing shaft 401, the buffer cylinder 402, the buffer piston 403, the driving-side contact part 405, the cylinder support 406, and the piston support 407 is formed of, for example, a metal material, and each is electrically connected to the electric wire EC1b.

[0046] [B-3-2-1] Gas circuit breaker movable energized shaft 401 The gas circuit breaker movable energized shaft 401 is a rod-shaped body and is installed coaxially with the opposing side arc contact 331 and the like. The gas circuit breaker movable energized shaft 401 is connected to the operating mechanism 257 via the insulating rod 256. The operating mechanism 257 is configured to operate the gas circuit breaker movable energized shaft 401 using, for example, an electric spring or an electromagnetic repulsion mechanism, and the gas circuit breaker movable energized shaft 401 moves in the axial direction by the operating mechanism 257.

[0047] Here, the gas circuit breaker movable energized shaft 401 has a movable energized shaft solid part 411 and a movable energized shaft hollow part 412.

[0048] The movable energized shaft solid part 411 is, for example, cylindrical.

[0049] The movable energized shaft hollow part 412 is, for example, cylindrical, and the end located on the drive side DS is connected to the movable energized shaft solid part 411. The outer diameter of the movable energized shaft hollow part 412 is, for example, the same as the outer diameter of the movable energized shaft solid part 411. The inner diameter of the movable energized shaft hollow part 412 is larger than the outer diameter of the opposing side arc contact 331. A first ventilation hole H412 penetrating in the radial direction is formed at the end of the movable energized shaft hollow part 412 located on the drive side DS.

[0050] [B-3-2-2] Puffer cylinder 402 The puffer cylinder 402 is configured to slide in the axial direction together with the gas circuit breaker movable energized shaft 401 by the operating mechanism 257.

[0051] Here, the puffer cylinder 402 includes a cylinder cylindrical part 421 and a cylinder bottom plate part 422.

[0052] The cylinder cylindrical part 421 is, for example, a cylindrical tubular body, and is installed coaxially with the opposing side arc contact 331 or the like. The inner diameter of the cylinder cylindrical part 421 is larger than the outer diameter of the gas circuit breaker movable current-carrying shaft 401, and the gas circuit breaker movable current-carrying shaft 401 is accommodated inside the cylinder cylindrical part 421.

[0053] The cylinder bottom plate part 422 is, for example, a disk-shaped plate body, and is provided at the end portion located on the driving side DS in the cylinder cylindrical part 421.

[0054] A rod through-hole H422a through which the gas circuit breaker movable current-carrying shaft 401 penetrates is formed at the center of the cylinder bottom plate part 422. The inner diameter of the rod through-hole H422a is substantially the same as the outer diameter of the gas circuit breaker movable current-carrying shaft 401, and the gas circuit breaker movable current-carrying shaft 401 is fixed to the buffer cylinder 402 in a state of being penetrated through the rod through-hole H422a through which the gas circuit breaker movable current-carrying shaft 401 penetrates. The cylinder bottom plate part 422 and the gas circuit breaker movable current-carrying shaft 401 are electrically connected.

[0055] Further, an exhaust hole H422b is formed in the cylinder bottom plate part 422. The exhaust hole H422b is formed so as to penetrate in the axial direction around the rod through-hole H422a. Here, the exhaust hole H422b is configured to communicate with the rod through-hole H422a, for example.

[0056] [B-3-2-3] Buffer piston 403 The buffer piston 403 is accommodated inside the buffer cylinder 402. The buffer piston 403 is fixed to the grounding tank 200 via the cylinder support 406 and the piston support 407. The buffer piston 403 is, for example, an annular ring-shaped body, and is installed coaxially with the opposing side arc contact 331 or the like. The gas circuit breaker movable current-carrying shaft 401 penetrates through the inside of the buffer piston 403.

[0057] Here, the inner diameter of the buffer piston 403 is substantially the same as the outer diameter of the movable energization shaft 401 of the gas circuit breaker, and the movable energization shaft 401 of the gas circuit breaker is axially slidable with respect to the buffer piston 403. Further, the outer diameter of the buffer piston 403 is substantially the same as the inner diameter of the cylinder cylindrical portion 421 that constitutes the buffer cylinder 402, and the buffer cylinder 402 is axially slidable with respect to the buffer piston 403.

[0058] The buffer piston 403 divides the inside of the buffer cylinder 402 in the axial direction. Inside the buffer cylinder 402, the space located on the drive side DS with respect to the buffer piston 403 is the buffer chamber PR. The volume of the buffer chamber PR changes as the buffer cylinder 402 moves axially together with the movable energization shaft 401 of the gas circuit breaker. When the volume of the buffer chamber PR decreases, the pressure of the insulating gas rises inside the buffer chamber PR. Then, the insulating gas whose pressure has risen in the buffer chamber PR is discharged from the buffer chamber PR via the exhaust hole H422b of the buffer cylinder 402.

[0059] [B-3-2-4] Drive-side contact portion 405 The drive-side contact portion 405 is configured to slide axially together with the movable energization shaft 401 of the gas circuit breaker by the operating mechanism 257 so that the distance between the drive-side contact portion 405 and the opposing-side contact portion 303 varies.

[0060] Here, the drive-side contact portion 405 includes a drive-side arc contact 451 and a drive-side energization contact 455.

[0061] [B-3-2-4-1] Drive-side arc contact 451 The drive-side arc contact 451 is, for example, a cylindrical tubular body and is installed coaxially with the opposing-side arc contact 331 and the like.

[0062] Here, the driving-side arc contact 451 has substantially the same outer diameter and inner diameter as the hollow portion 412 of the movable current-carrying shaft that constitutes the gas circuit breaker movable current-carrying shaft 401. The driving-side arc contact 451 is connected to the end portion located on the opposite side OS in the hollow portion 412 of the movable current-carrying shaft and is electrically connected to the gas circuit breaker movable current-carrying shaft 401. The driving-side arc contact 451, together with the gas circuit breaker movable current-carrying shaft 401, is configured to slide in the axial direction by the operating mechanism 257.

[0063] The end portion 451a of the driving-side arc contact 451 located on the opposite side OS protrudes inward in the radial direction, and the inner diameter of the end portion 451a is the same as the outer diameter of the opposite-side arc contact 331.

[0064] The driving-side arc contact 451 is configured such that the opposite-side arc contact 331 is inserted therein in the energized state, and an arc discharge occurs between the driving-side arc contact 451 and the opposite-side arc contact 331 during the interruption process.

[0065] [B-3-2-4-2] Driving-side energized contact 455 The driving-side energized contact 455 is, for example, an annular ring-shaped body and is installed coaxially with the opposite-side arc contact 331 and the like. The driving-side energized contact 455 includes a portion that houses the driving-side arc contact 451 therein.

[0066] Here, the inner diameter of the driving-side energized contact 455 is larger than the outer diameter of the driving-side arc contact 451. The outer diameter of the driving-side energized contact 455 is the same as the inner diameter of the end portion 335a of the opposite-side energized contact 335. The driving-side energized contact 455 is fixed to the cylinder bottom plate portion 422 of the buffer cylinder 402 so as to surround the driving-side arc contact 451 and is electrically connected to the buffer cylinder 402. The driving-side energized contact 455, together with the gas circuit breaker movable current-carrying shaft 401, is configured to slide in the axial direction by the operating mechanism 257.

[0067] The end portion 455a of the driving-side energized contact 455 located on the opposite side OS is, for example, a curved surface.

[0068] The driving-side energization contact 455 is configured to be inserted into the opposing-side energization contact 335 in the energized state.

[0069] [B-3-2-5] Cylinder support 406 The cylinder support 406 is electrically connected to the buffer cylinder 402 and the electric wire EC1b. The cylinder support 406 is fixed to the grounding tank 200 and supports the buffer cylinder 402 so that the buffer cylinder 402 slides in the axial direction.

[0070] Here, the cylinder support 406 includes a cylinder support cylindrical portion 461 and a cylinder support annular portion 462.

[0071] The cylinder support cylindrical portion 461 is a cylindrical tubular body and is installed coaxially with the opposing-side arc contact 331 and the like. The inner diameter of the cylinder support cylindrical portion 461 is larger than the outer diameter of the cylinder cylindrical portion 421 that constitutes the buffer cylinder 402.

[0072] The cylinder support annular portion 462 is an annular ring-shaped body and is installed coaxially with the opposing-side arc contact 331 and the like. The cylinder support annular portion 462 is provided at the end portion of the cylinder support cylindrical portion 461 located on the opposing side OS, and is configured to protrude radially inward from the cylinder support cylindrical portion 461. Here, the cylinder support annular portion 462 is integrally formed with the cylinder support cylindrical portion 461. The inner diameter of the cylinder support annular portion 462 is the same as the outer diameter of the cylinder cylindrical portion 421 that constitutes the buffer cylinder 402.

[0073] A second ventilation hole H461 is formed in the cylinder support cylindrical portion 461. The second ventilation hole H461 is configured to penetrate the cylinder support cylindrical portion 461 in the radial direction.

[0074] [B-3-2-6] Piston support 407 The piston support 407 is fixed to the cylinder support 406 and supports the buffer piston 403. Inside the piston support 407, the gas breaker movable energization shaft 401 penetrates.

[0075] Here, the piston support 407 includes a piston support cylindrical portion 471 and a piston support annular portion 472.

[0076] The piston support cylindrical portion 471 is a cylindrical tubular body and is installed coaxially with the opposing side arc contact 331 and the like. The outer diameter of the piston support cylindrical portion 471 is smaller than the outer diameter of the buffer piston 403, and the inner diameter of the piston support cylindrical portion 471 is larger than the outer diameter of the gas breaker movable energization shaft 401. The end portion of the piston support cylindrical portion 471 located on the opposing side OS is connected to the buffer piston 403.

[0077] The piston support annular portion 472 is an annular ring-shaped body and is installed coaxially with the opposing side arc contact 331 and the like. The piston support annular portion 472 is provided at the end portion of the piston support cylindrical portion 471 located on the driving side DS. The outer diameter of the piston support annular portion 472 is smaller than the outer diameter of the piston support cylindrical portion 471, and the inner diameter of the piston support annular portion 472 is larger than the outer diameter of the gas breaker movable energization shaft 401. The outer diameter of the piston support annular portion 472 is the same as the inner diameter of the cylinder support cylindrical portion 461, and the piston support annular portion 472 is fixed to the cylinder support cylindrical portion 461. Here, the piston support annular portion 472 is integrally formed with the piston support cylindrical portion 471.

[0078] A third ventilation hole H471 is formed in the piston support cylindrical portion 471. The third ventilation hole H471 is configured to penetrate the piston support cylindrical portion 471 in the radial direction.

[0079] [B-3-2-7] Insulating nozzle 500 The insulating nozzle 500 is formed of an insulating material. The insulating nozzle 500 is a cylindrical tubular body and is installed coaxially with the counter-arc contact 331 etc. inside the grounding tank 200.

[0080] The insulating nozzle 500 is fixed to the buffer cylinder 402 and is configured to move together with the buffer cylinder 402, the driving-side contact portion 405 etc. in the breaking process from the energized state (closed state) to the open-pole state (open state).

[0081] The insulating nozzle 500 has an internal nozzle space S500 formed therein, and the counter-arc contact 331 and the driving-side arc contact 451 are accommodated in the nozzle internal space S500. Further, the insulating nozzle 500 is configured such that when an arc discharge occurs between the counter-contact portion 303 and the driving-side contact portion 405 in the breaking process, insulating gas is discharged from the buffer chamber PR into the nozzle internal space S500.

[0082] The insulating nozzle 500 has a nozzle large-diameter portion 510, a nozzle small-diameter portion 520, and a nozzle inclined portion 530.

[0083] The nozzle large-diameter portion 510 is a portion of the insulating nozzle 500 located on the driving side DS and is interposed between the driving-side arc contact 451 and the driving-side energizing contact 455. The outer peripheral surface of the nozzle large-diameter portion 510 includes a portion along the axial direction.

[0084] The nozzle small-diameter portion 520 is located on the opposite side OS of the insulating nozzle 500 with respect to the nozzle large-diameter portion 510. The outer peripheral surface of the nozzle small-diameter portion 520 includes a portion along the axial direction. The outer diameter of the portion of the outer peripheral surface along the axial direction in the nozzle small-diameter portion 520 is smaller than the outer diameter of the nozzle large-diameter portion 510.

[0085] The nozzle inclined portion 530 is located on the opposite side OS to the nozzle small-diameter portion 520 in the insulating nozzle 500. The nozzle inclined portion 530 includes a portion where the outer peripheral surface is inclined with respect to the axial direction so that the outer diameter increases as it goes from the nozzle small-diameter portion 520 toward the opposite side OS. The end portion 530a of the nozzle inclined portion 530 located on the opposite side OS protrudes outward in the radial direction, and the outer diameter of the end portion 530a is smaller than the inner diameter of the opposite-side energization contact 335.

[0086] [B-4] Control unit 800 As shown in FIG. 2A, the cutoff device 100 further includes a control unit 800 in addition to the above.

[0087] The control unit 800 includes an arithmetic unit (not shown) and a memory device (not shown), and is configured to control the operations of each part constituting the cutoff device 100, for example, by a high-speed sequence, by performing arithmetic processing by the arithmetic unit using a program stored in the memory device.

[0088] The control unit 800 outputs a control signal to the operating mechanism 217 and the operating mechanism 257 based on, for example, a command input from the outside, and controls the operations of the operating mechanism 217 and the operating mechanism 257. Thereby, the control unit 800 executes a circuit cutoff operation for changing the circuit EC from the energized state to the cutoff state and a circuit connection operation for changing the circuit EC from the cutoff state to the energized state.

[0089] When executing the circuit cutoff operation, the control unit 800 controls the operations of the operating mechanism 217 and the operating mechanism 257 so as to switch each of the energization contact 101, the first cutoff contact 111, and the second cutoff contact 112 from the closed state to the open state. When executing the circuit connection operation, the control unit 800 controls the operations of the operating mechanism 217 and the operating mechanism 257 so as to switch each of the energization contact 101, the first cutoff contact 111, and the second cutoff contact 112 from the open state to the closed state.

[0090] [C] Operation of the cutoff device 100 FIGS. 3A, 3B, and 3C are circuit diagrams showing the operation of the cutoff device 100 according to the first embodiment.

[0091] In FIGS. 3A, 3B, and 3C, together with FIG. 1, the state when the circuit closing operation is executed in the disconnector 100 is shown. In each figure, the state where each contact is in an electrically insulated state is shown as an open state ("Open" in the figure), and the state where each contact is in an electrically connected state is shown as a closed state ("Close" in the figure).

[0092] When the circuit closing operation is executed in the disconnector 100 of the present embodiment, the circuit EC changes from the disconnected state (fully open state) shown in FIG. 1 to the energized state through the closing process sequentially shown in FIGS. 3A, 3B, and 3C, and current flows through the circuit EC. That is, in the circuit closing operation, as shown in FIGS. 3A, 3B, and 3C, the first disconnection contact closing operation (ST1), the second disconnection contact closing operation (ST2), and the energizing contact closing operation (ST3) are sequentially executed.

[0093] Hereinafter, the details of the circuit closing operation will be described.

[0094] [C-1] Disconnected state In the disconnected state before the circuit closing operation is executed, as shown in FIG. 1, the first disconnection contact 111, the second disconnection contact 112, and the energizing contact 101 are in the open state.

[0095] Specifically, in the vacuum circuit breaker 211, the space between the movable electrode 111A and the fixed electrode 111B accommodated as the first disconnection contact 111 inside the vacuum vessel 212 is separated, and the first disconnection contact 111 is in the open state due to being in an electrically insulated state. Also, in the gas circuit breaker 251, the space between the driving-side energizing contact 455 and the opposing-side energizing contact 335 that constitute the energizing contact 101 is separated, and the energizing contact 101 is in the open state due to being in an electrically insulated state. Further, in the gas circuit breaker 251, the space between the driving-side arc contact 451 and the opposing-side arc contact 331 that constitute the second disconnection contact 112 is separated, and the second disconnection contact 112 is in the open state due to being in an electrically insulated state (see FIG. 2A).

[0096] As a result, in the cutoff state, in each of the power supply circuit EC and the cutoff circuit EC2, the current is cut off (see FIG. 1). In the gas circuit breaker 251, the power supply contact 101 and the second cutoff contact 112 have a withstand voltage performance capable of withstanding the operating voltage before the circuit energization operation is executed.

[0097] [C-2] Energization process [C-2-1] First cutoff contact closing operation (ST1) In the circuit energization operation, as shown in FIG. 3A, first, the first cutoff contact closing operation (ST1) is executed. In the first cutoff contact closing operation (ST1), the first cutoff contact 111 switches from the open state to the closed state.

[0098] Although not shown, in the first cutoff contact closing operation (ST1), in the vacuum circuit breaker 211, the movable electrode 111A and the fixed electrode 111B accommodated as the first cutoff contact 111 inside the vacuum vessel 212 approach each other to form an electrical connection state (see FIG. 2A). In the gas circuit breaker 251, the power supply contact 101 and the second cutoff contact 112 have a withstand voltage performance capable of withstanding the operating voltage even after the completion of the first cutoff contact closing operation (ST1).

[0099] [C-2-2] Second cutoff contact closing operation (ST2) Next, in the circuit energization operation, as shown in FIG. 3B, the second cutoff contact closing operation (ST2) is executed. In the second cutoff contact closing operation (ST2), the second cutoff contact 112 switches from the open state to the closed state.

[0100] FIG. 4A is a cross-sectional view showing the state when the second cutoff contact closing operation (ST2) is executed in the gas circuit breaker 251 constituting the cutoff device 100 according to the first embodiment.

[0101] As shown in FIG. 4A, in the second cutoff contact closing operation (ST2), in the gas circuit breaker 251, the driving-side arc contact 451 and the opposing-side arc contact 331 constituting the second cutoff contact 112 approach each other to form an electrical connection state.

[0102] Specifically, when the second disconnection contact closing operation (ST2) is executed, in the gas circuit breaker 251, as the movable energization shaft 401 of the gas circuit breaker moves from the drive side DS to the opposite side OS, the drive side arc contact 451 approaches the opposite side arc contact 331. At this time, inside the insulating nozzle 500, a pre-arc discharge AR occurs between the opposite side arc contact 331 and the drive side arc contact 451. Due to the pre-arc discharge AR, an electrical connection state is established between the opposite side arc contact 331 and the drive side arc contact 451.

[0103] Upon completion of the first disconnection contact closing operation (ST1) and the second disconnection contact closing operation (ST2), the first disconnection contact 111 becomes closed and the second disconnection contact 112 becomes closed, so that current flows through the disconnection circuit EC2 in which the first disconnection contact 111 and the second disconnection contact 112 are installed (see FIG. 3B).

[0104] [C-2-3] Energization contact closing operation (ST3) Next, in the circuit closing operation, as shown in FIG. 3C, the energization contact closing operation (ST3) is executed. In the energization contact closing operation (ST3), the energization contact 101 switches from the open state to the closed state.

[0105] FIG. 4B is a cross-sectional view showing the state when the energization contact closing operation (ST3) is executed in the gas circuit breaker 251 constituting the disconnection device 100 according to the first embodiment.

[0106] As shown in FIG. 4B, in the energization contact closing operation (ST3), in the gas circuit breaker 251, as the drive side energization contact 455 and the opposite side energization contact 335 constituting the energization contact 101 approach each other and an electrical connection state is established, the energization contact 101 switches to the closed state.

[0107] Specifically, when the energized contact closing operation (ST3) is executed, in the gas circuit breaker 251, the movable energized shaft 401 of the gas circuit breaker further moves from the drive side DS to the opposite side OS, so that after the drive-side arc contact 451 contacts the opposite-side arc contact 331, the opposite-side energized contact 335 and the drive-side energized contact 455 approach each other. Then, as the movable energized shaft 401 of the gas circuit breaker further moves from the drive side DS to the opposite side OS, the opposite-side energized contact 335 and the drive-side energized contact 455 come into contact with each other to establish an electrical connection state.

[0108] Thus, in the interrupting device 100 of the present embodiment, when the energized contact 101, the first interrupting contact 111, and the second interrupting contact 112 are switched to the closed state, the electric circuit EC is switched to the energized state. As described above, in the present embodiment, the energized contact 101 is configured to have a smaller resistance than the first interrupting contact 111 and the second interrupting contact 112. Therefore, after the energized contact closing operation (ST3) is completed, a larger current flows in the energizing electric circuit EC1 where the energized contact 101 is installed than in the interrupting electric circuit EC2 where the first interrupting contact 111 and the second interrupting contact 112 are installed. That is, current commutation occurs (see FIG. 3C).

[0109] [D] Details of the electric circuit closing operation The electric circuit closing operation executed in the present embodiment will be described in more detail.

[0110] FIG. 5 is a diagram showing the electric circuit closing operations (the first interrupting contact closing operation (ST1), the second interrupting contact closing operation (ST2), and the energized contact closing operation (ST3)) executed in the first embodiment.

[0111] In FIG. 5, the horizontal axis represents time, and the vertical axis represents the states of each contact (energizing contact 101, first interrupting contact 111, second interrupting contact 112). In FIG. 5, when each contact is in the open state (electrical insulation state), it is indicated as "Open", and when each contact is in the closed state (electrical connection state), it is indicated as "Close" (the broken line part indicates the transition from the open state to the closed state). Also, in FIG. 5, the time point when the closing operation starts at each contact (the time point when the approach between a pair of contactors (electrodes) starts) is indicated as "START", the time point when the closing operation is completed at each contact (the time point when the pair of contactors (electrodes) switches to the electrical connection state) is indicated as "END", and the period during which pre-arcing discharge occurs is indicated as "ARC".

[0112] As shown in FIG. 5, the first interrupting contact closing operation (ST1) starts at the start time point t111s and ends at the end time point t111e, and the first interrupting contact 111 switches from the open state to the closed state. The second interrupting contact closing operation (ST2) starts at the start time point t112s and ends at the end time point t112e, and the second interrupting contact 112 switches from the open state to the closed state. The energizing contact closing operation (ST3) starts at the start time point t101s and ends at the end time point t101e, and the energizing contact 101 switches from the open state to the closed state. Note that the end time point t112e of the second interrupting contact closing operation (ST2) is the time point when a pre-arcing discharge AR occurs between the opposing arc contactor 331 and the driving arc contactor 451 that constitute the second interrupting contact 112, and the two are in an electrical connection state. After the end time point t112e of the second interrupting contact closing operation (ST2), until the arc extinction time point t112a when the pre-arcing discharge AR disappears, the opposing arc contactor 331 and the driving arc contactor 451 that constitute the second interrupting contact 112 are physically connected, and the electrical connection state between the two is maintained (see FIG. 4A).

[0113] In this embodiment, the start time t111s of the first cutoff contact closing operation (ST1) is before the start time t112s of the second cutoff contact closing operation (ST2). Here, the start time t111s of the first cutoff contact closing operation (ST1) is earlier than the start time t112s of the second cutoff contact closing operation (ST2). Also, the completion time t111e of the first cutoff contact closing operation (ST1) is before the completion time t112e of the second cutoff contact closing operation (ST2). Here, the completion time t111e of the first cutoff contact closing operation (ST1) is after the start time t112s of the second cutoff contact closing operation (ST2) and before the completion time t112e of the second cutoff contact closing operation (ST2).

[0114] In this embodiment, the start time t112s of the second cutoff contact closing operation (ST2) is before the completion time t111e of the first cutoff contact closing operation (ST1). The completion time t112e of the second cutoff contact closing operation (ST2) is before the completion time t101e of the energizing contact closing operation (ST3).

[0115] In this embodiment, the start time t101s of the energizing contact closing operation (ST3) is the same as the start time t112s of the second cutoff contact closing operation (ST2). Here, the start time t101s of the energizing contact closing operation (ST3) is after the completion time t111e of the first cutoff contact closing operation (ST1) and before the completion time t112e of the second cutoff contact closing operation (ST2). The completion time t101e of the energizing contact closing operation (ST3) is after the arc extinction time t112a when the pre-arc discharge AR disappears at the second cutoff contact 112. Note that the start time t101s of the energizing contact closing operation (ST3) does not have to be the same as the start time t112s of the second cutoff contact closing operation (ST2). That is, the gas circuit breaker 251 may be configured such that the driving-side arc contact 451 and the driving-side energizing contact 455 move independently of each other.

[0116] [E]Summary As described above, the interrupting device 100 of the present embodiment has a power conduction contact 101, a first interrupting contact 111, and a second interrupting contact 112. The first interrupting contact 111 is connected in parallel with the power conduction contact 101, and the second interrupting contact 112 is connected in parallel with the power conduction contact 101 and is also connected in series with the first interrupting contact 111. The first interrupting contact 111 is constituted by a vacuum interrupter 211 that switches between a closed state and an open state inside the vacuum container 212. The second interrupting contact 112 and the power conduction contact 101 are constituted by a gas interrupter 251 that switches between a closed state and an open state inside an insulating gas container 202 filled with an insulating gas.

[0117] In the interrupting device 100 of the present embodiment, since the power conduction contact 101 is constituted by the gas interrupter 251, sufficient power conduction performance can be obtained in the energized state. Therefore, in the interrupting device 100 of the present embodiment, the vacuum interrupter 211 that constitutes the first interrupting contact 111 does not need to improve the power conduction performance, and thus can switch from the closed state to the open state at a higher speed and can obtain sufficient withstand voltage performance. Further, in the interrupting device 100 of the present embodiment, the first interrupting contact 111 constituted by the vacuum interrupter 211 is used to finally enter the interrupted state. Therefore, in the gas interrupter 251 that constitutes the power conduction contact 101 and the second interrupting contact 112, it is possible to reduce the usage amount of SF6 gas having high performance such as insulation performance and arc extinguishing performance, and a gas having a lower greenhouse effect coefficient than SF6 gas can be applied as the insulating gas.

[0118] As described above, in the present embodiment, when performing the circuit closing operation, a first interrupting contact closing operation (ST1) for closing the first interrupting contact 111 from the open state, a second interrupting contact closing operation (ST2) for closing the second interrupting contact 112 from the open state, and a power conduction contact closing operation (ST3) for closing the power conduction contact 101 from the open state are executed.

[0119] In this embodiment, the completion time t111e of the first disconnection contact closing operation (ST1) is earlier than the completion time t112e of the second disconnection contact closing operation (ST2). And the completion time t112e of the second disconnection contact closing operation (ST2) is earlier than the completion time t101e of the energizing contact closing operation (ST3) (see Fig. 5).

[0120] Thus, in the first disconnection contact closing operation (ST1) of this embodiment, when the second disconnection contact 112 is in the open state, the first disconnection contact 111 switches from the open state to the closed state. That is, when the distance between the movable electrode 111A and the fixed electrode 111B constituting the first disconnection contact 111 in the vacuum circuit breaker 211 approaches and transitions to an electrically connected state, the distance between the opposing arc contact 331 and the driving-side arc contact 451 constituting the second disconnection contact 112 maintains an electrically insulating state (see Figs. 2A and 3A). For this reason, in the first disconnection contact closing operation (ST1), no current flows through the interrupting circuit EC2. Therefore, even when the distance between the movable electrode 111A and the fixed electrode 111B in the vacuum circuit breaker 211 approaches, no pre-arcing discharge occurs between the movable electrode 111A and the fixed electrode 111B. Therefore, in this embodiment, even if the movable electrode 111A and the fixed electrode 111B constituting the vacuum circuit breaker 211 come into contact after the completion of the first disconnection contact closing operation (ST1), they do not become welded together due to pre-arcing discharge. As a result, an interrupting operation for opening the vacuum circuit breaker 211 from the closed state is executed. Even when the movable electrode 111A and the fixed electrode 111B are separated, the surfaces of the movable electrode 111A and the fixed electrode 111B do not become roughened, so the withstand voltage performance of the vacuum circuit breaker 211 does not deteriorate.

[0121] Therefore, even when the vacuum circuit breaker 211 is used in the interrupting device 100 of the present embodiment, sufficient withstand voltage performance can be provided. In addition, in the execution of the second interrupting contact closing operation (ST2), pre-arcing occurs between the opposing arc contact 331 and the driving-side arc contact 451 that constitute the second interrupting contact 112. However, unlike the case of the vacuum circuit breaker 211, a decrease in withstand voltage performance does not occur. Since the gas circuit breaker 251 is less affected by the contact surface roughness on the withstand voltage performance compared to the vacuum circuit breaker 211, there is no problem even if pre-arcing occurs on the gas circuit breaker 251 side.

[0122] Also, in the present embodiment, the start time t112s of the second interrupting contact closing operation (ST2) is earlier than the completion time t111e of the first interrupting contact closing operation (ST1). Therefore, in the interrupting device 100 of the present embodiment, the execution time of the circuit closing operation can be shortened.

[0123] [F]Modification Example A modification example of the present embodiment will be described.

[0124] [F-1]Modification Example 1-1 FIG. 6 is a diagram showing the circuit closing operation (the first interrupting contact closing operation (ST1), the second interrupting contact closing operation (ST2), the energizing contact closing operation (ST3)) executed in Modification Example 1-1 of the first embodiment. In FIG. 6, similar to FIG. 5, the horizontal axis represents time, and the vertical axis represents the states of the respective contacts (the energizing contact 101, the first interrupting contact 111, the second interrupting contact 112).

[0125] As shown in FIG. 6, in the circuit closing operation of this modification example, the completion time t111e of the first interrupting contact closing operation (ST1) is the same as the completion time t112e of the second interrupting contact closing operation (ST2). That is, in this modification example, the first interrupting contact 111 and the second interrupting contact 112 are simultaneously switched from the open state to the closed state, and at the completion time t111e of the first interrupting contact closing operation (ST1) and the completion time t112e of the second interrupting contact closing operation (ST2), current flows through the interrupting circuit EC2.

[0126] Therefore, as shown in FIG. 6, at the completion time t111e of the first disconnection contact closing operation (ST1), a pre-arcing discharge occurs between the movable electrode 111A and the fixed electrode 111B that form the first disconnection contact 111 in the vacuum circuit breaker 211, and an electrical connection state is established between the two. Therefore, when the movable electrode 111A and the fixed electrode 111B come into contact thereafter, the movable electrode 111A and the fixed electrode 111B may be welded together by the pre-arcing discharge.

[0127] However, as shown in FIG. 6, at the completion time t112e of the second disconnection contact closing operation (ST2), which is the same time as the completion time t111e of the first disconnection contact closing operation (ST1), a pre-arcing discharge also occurs between the driving-side arc contact 451 and the opposing-side arc contact 331 that form the second disconnection contact 112 in the gas circuit breaker 251, and an electrical connection state is established between the two.

[0128] Thus, in this modified example, pre-arcing discharges occur simultaneously at the first disconnection contact 111 and the second disconnection contact 112. For this reason, when a current flows through the interrupting circuit EC2 in this modified example, the voltage (shared voltage) applied to the first disconnection contact 111 is lower than when current flows only through the first disconnection contact 111 in the interrupting circuit EC2. Similarly, the time until the pre-arcing discharge occurs and disappears at the first disconnection contact 111 is shorter than when current flows only through the first disconnection contact 111 in the interrupting circuit EC2. As a result, the damage to the first disconnection contact 111 is reduced compared to the case where current flows only through the first disconnection contact 111 in the interrupting circuit EC2.

[0129] Therefore, the withstand voltage performance of the interrupting device 100 can be sufficiently maintained even in this modified example.

[0130] [F-2] Modified Example 1-2 In the closing operation (ST1) of the first cutoff contact, the closing speed of the first cutoff contact 111 from the open state to the closed state is preferably lower than the closing speed of the second cutoff contact 112 from the open state to the closed state in the closing operation (ST2) of the second cutoff contact and the closing speed of the energizing contact 101 from the open state to the closed state in the energizing contact closing operation (ST3).

[0131] When the closing speed of the first cutoff contact 111 is high, chattering (fine mechanical vibration) may occur in the vacuum circuit breaker 211 including the first cutoff contact 111. For this reason, when chattering occurs in the vacuum circuit breaker 211 including the first cutoff contact 111 during the execution of the closing operation (ST2) of the second cutoff contact, pre-arcing may occur at the first cutoff contact 111. However, by making the closing speed of the first cutoff contact 111 lower than the closing speeds of the second cutoff contact 112 and the energizing contact 101, it is possible to suppress the occurrence of chattering in the vacuum circuit breaker 211.

[0132] <Second Embodiment> [A] Details of the circuit closing operation FIG. 7 is a diagram showing the circuit closing operations (the closing operation (ST1) of the first cutoff contact, the closing operation (ST2) of the second cutoff contact, the energizing contact closing operation (ST3)) executed in the second embodiment. In FIG. 7, as in FIG. 5, the horizontal axis represents time, and the vertical axis represents the states of the respective contacts (the energizing contact 101, the first cutoff contact 111, the second cutoff contact 112).

[0133] In the present embodiment, as shown in FIG. 7, a part of the circuit closing operation is different from that in the case of the first embodiment (see FIG. 5). Except for this point and related matters, the cutoff device 100 of the present embodiment is the same as that in the case of the first embodiment. Therefore, descriptions of overlapping matters will be omitted as appropriate.

[0134] As shown in FIG. 7, in the circuit energization operation of the present embodiment, the start time t112s of the second cutoff contact energization operation (ST2) and the start time t101s of the energization contact energization operation (ST3) are different from those in the case of the first embodiment (see FIG. 5), and are after the completion time t111e of the first cutoff contact energization operation (ST1). That is, in the present embodiment, after the first cutoff contact 111 is switched from the open state to the closed state by the completion of the first cutoff contact energization operation (ST1), the second cutoff contact energization operation (ST2) and the energization contact energization operation (ST3) are started, and when the second cutoff contact 112 shifts from the open state to the closed state, the energization contact 101 also shifts from the open state to the closed state.

[0135] In the present embodiment, it includes a detection unit (not shown) such as a contact that outputs a signal when the first cutoff contact 111 is switched from the open state to the closed state, and the control unit 800 causes the second cutoff contact 112 etc. to shift from the open state to the closed state according to the signal output by the detection unit.

[0136] [B]Summary As described above, in the present embodiment, since the second cutoff contact energization operation (ST2) has not been started before the completion of the first cutoff contact energization operation (ST1), it is possible to surely prevent current from flowing through the cutoff circuit EC2 during the first cutoff contact energization operation (ST1). As a result, in the present embodiment, it is possible to surely prevent pre-breakdown discharge from occurring between the movable electrode 111A and the fixed electrode 111B that constitute the first cutoff contact 111 in the vacuum circuit breaker 211, so that the withstand voltage performance of the vacuum circuit breaker 211 does not deteriorate.

[0137] Therefore, even when the vacuum circuit breaker 211 is used in the cutoff device 100 of the present embodiment, it is possible to further sufficiently provide withstand voltage performance.

[0138] <Third Embodiment> [A]Detailed Configuration of the Cutoff Device 100 FIG. 8A is a cross-sectional view schematically showing the configuration of the cutoff device 100 according to the third embodiment. In FIG. 8A, as in FIG. 2A, the state where the cutoff device 100 is in the cutoff state is shown.

[0139] As shown in FIG. 8A, the cutoff device 100 of this embodiment is different from the case of the first embodiment (see FIG. 2A) in that the operating mechanism 217 is not provided. Except for this point and related matters, the cutoff device 100 of this embodiment is the same as that of the first embodiment. Therefore, regarding overlapping matters, the description will be omitted as appropriate.

[0140] As shown in FIG. 8A, in the cutoff device 100 of this embodiment, the operating mechanism 257 is configured such that the energization contact 101 and the second cutoff contact 112 are operated by the operating mechanism 257, similar to the case of the first embodiment (see FIG. 2A).

[0141] However, in the cutoff device 100 of this embodiment, the operating mechanism 257 is further configured to operate the first cutoff contact 111. Here, the operating mechanism 257 is connected to the insulating rod 216 via the operating link L216, and is configured to switch the first cutoff contact 111 between the closed state and the open state by operating the insulating rod 216.

[0142] [B] Details of the circuit energization operation FIG. 8B is a diagram showing the circuit energization operation (first cutoff contact energization operation (ST1), second cutoff contact energization operation (ST2), energization contact energization operation (ST3)) executed in the third embodiment. In FIG. 8B, similar to FIG. 5, the horizontal axis represents time, and the vertical axis represents the states of the respective contacts (energization contact 101, first cutoff contact 111, second cutoff contact 112).

[0143] As shown in FIG. 8B, in the circuit energization operation of this embodiment, similar to the case of the first embodiment (see FIG. 5), the completion time point t111e of the first cutoff contact energization operation (ST1) is before the completion time point t112e of the second cutoff contact energization operation (ST2). And the completion time point t112e of the second cutoff contact energization operation (ST2) is before the completion time point t101e of the energization contact energization operation (ST3).

[0144] However, as shown in FIG. 8B, in the circuit energization operation of the present embodiment, unlike the case of the first embodiment (see FIG. 5), the start time t111s of the first disconnection contact energization operation (ST1), the start time t112s of the second disconnection contact energization operation (ST2), and the start time t101s of the energization contact energization operation (ST3) are the same. That is, in the present embodiment, the first disconnection contact energization operation (ST1), the second disconnection contact energization operation (ST2), and the energization contact energization operation (ST3) are started simultaneously.

[0145] [C] Summary As described above, in the disconnector 100 of the present embodiment, the operating mechanism 257 operates the energization contact 101, the first disconnection contact 111, and the second disconnection contact 112, and is configured such that the first disconnection contact energization operation (ST1), the second disconnection contact energization operation (ST2), and the energization contact energization operation (ST3) are started simultaneously.

[0146] Therefore, in the present embodiment, it is possible to obtain the same effects as those of the first embodiment while simplifying the device.

[0147] [D] Modification Note that, in the above embodiment, the case where the first disconnection contact energization operation (ST1), the second disconnection contact energization operation (ST2), and the energization contact energization operation (ST3) are started simultaneously by the operation of the operating mechanism 257 has been described, but the present invention is not limited thereto. For example, the operating mechanism 257 may be configured such that the second disconnection contact energization operation (ST2) and the energization contact energization operation (ST3) are started after the start of the first disconnection contact energization operation (ST1).

[0148] <Fourth Embodiment> [A] Detailed Configuration of Disconnector 100 FIG. 9 is a cross-sectional view schematically showing the configuration of the vacuum circuit breaker 211 including the first disconnection contact 111 in the disconnector according to the fourth embodiment.

[0149] In this embodiment, as shown in FIG. 9, the vacuum circuit breaker 211 is partially different in configuration from the case of the first embodiment (see FIG. 2A). Except for this point and related matters, the interrupting device 100 of this embodiment is the same as in the case of the first embodiment. Therefore, descriptions of overlapping matters will be omitted as appropriate.

[0150] As shown in FIG. 9, in the vacuum circuit breaker 211 of this embodiment, a spring SP216 is installed on the vacuum circuit breaker fixed energization shaft 213. The vacuum circuit breaker 211 of this embodiment is configured such that when the first interrupting contact 111 is in the closed state, the movable electrode 111A is pushed by the spring force of the spring SP216 and adheres to the fixed electrode 111B.

[0151] [B] Summary As described above, after the first interrupting contact closing operation (ST1) is completed in this embodiment (the first interrupting contact 111 is in the closed state), in the vacuum circuit breaker 211, the movable electrode 111A is in close contact with the fixed electrode 111B by the spring force of the spring SP216, and the first interrupting contact 111 surely holds the closed state. Therefore, in this embodiment, when the second interrupting contact closing operation (ST2) is executed after the first interrupting contact closing operation (ST1), chattering does not occur in the vacuum circuit breaker 211, and it is possible to prevent pre-arcing discharge from occurring between the movable electrode 111A and the fixed electrode 111B. As a result, in the interrupting device 100 of this embodiment, it is possible to effectively prevent the withstand voltage performance of the vacuum circuit breaker 211 from deteriorating.

[0152] Therefore, in the interrupting device 100 of this embodiment, even when the vacuum circuit breaker 211 is used, it can be further sufficiently provided with withstand voltage performance.

[0153] <Others> Although some embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

Explanation of Reference Numerals

[0154] 3: Opposite-side unit, 4: Driving-side unit, 100: Disconnector, 101: Energizing contact, 111: First disconnection contact, 111A: Movable electrode, 111B: Fixed electrode, 112: Second disconnection contact, 200: Grounding tank, 202: Insulated gas container, 211: Vacuum circuit breaker, 212: Vacuum container, 212a: Bushing, 212b: Flange, 213: Vacuum circuit breaker fixed energizing shaft, 214: Vacuum circuit breaker movable energizing shaft, 215: Bellows, 216: Insulating rod, 217: Operating mechanism, 218: Arc shield, 251: Gas circuit breaker, 253: Gas circuit breaker fixed energizing shaft, 256: Insulating rod, 257: Operating mechanism, 301: Cooling cylinder, 302: Support part, 303: Opposite-side contact part, 321: Support ring part, 322: Support protrusion, 331: Opposite-side arc contact, 331a: End part, 335: Opposite-side energizing contact, 335a: End part, 401: Gas circuit breaker movable energizing shaft, 402: Puffer cylinder, 403: Puffer piston, 405: Driving-side contact part, 406: Cylinder support, 407: Piston support, 411: Solid part of movable energizing shaft, 412: Hollow part of movable energizing shaft, 421: Cylinder cylindrical part, 422: Cylinder bottom plate part, 451: Driving-side arc contact, 451a: End part, 455: Driving-side energizing contact, 455a: End part, 461: Cylinder support cylindrical part, 462: Cylinder support annular part, 471: Piston support cylindrical part, 472: Piston support annular part, 500: Insulating nozzle, 510: Large-diameter part of nozzle, 520: Small-diameter part of nozzle, 530: Inclined part of nozzle, 530a: End part, 800: Control part, DS: Driving side, EC: Electric circuit, EC1: Energizing electric circuit, EC2: Disconnection electric circuit, H412: First ventilation hole, H422a: Rod through-hole, H422b: Exhaust hole, H461: Second ventilation hole, H471: Third ventilation hole, L216: Operating link, OS: Opposite side, PR: Puffer chamber, R: Pre-arcing discharge AR, S500: Internal space of nozzle, SL214: Sliding part, SP: Support part, SP216: Spring, ST1: First disconnection contact closing operation, ST2: Second disconnection contact closing operation, ST3: Energizing contact closing operation

Claims

1. An energized contact, a first interrupting contact connected in parallel with the energized contact, and a second interrupting contact connected in parallel with the energized contact and in series with the first interrupting contact, comprising: the first interrupting contact is constituted by a vacuum circuit breaker that switches between a closed state and an open state inside a vacuum container; the second interrupting contact and the energized contact are constituted by gas circuit breakers that switch between a closed state and an open state inside an insulating gas container filled with an insulating gas; when performing a circuit closing operation to change the circuit from an interrupted state to an energized state, a first interrupting contact closing operation for changing the first interrupting contact from an open state to a closed state, a second interrupting contact closing operation for changing the second interrupting contact from an open state to a closed state, and an energized contact closing operation for changing the energized contact from an open state to a closed state are executed; a circuit breaker, the completion time of the first interrupting contact closing operation is before the completion time of the second interrupting contact closing operation, and the completion time of the second interrupting contact closing operation is before the completion time of the energized contact closing operation; when the first interrupting contact closing operation and the second interrupting contact closing operation are completed, current flows through the first interrupting contact and the second interrupting contact, and when the energized contact closing operation is completed, a larger current flows through the energized contact than through the first interrupting contact and the second interrupting contact; circuit breaker.

2. The start time of the second interrupting contact closing operation is before the completion time of the first interrupting contact closing operation, The circuit breaker according to claim 1.

3. The completion time of the first interrupting contact closing operation is the same as the completion time of the second interrupting contact closing operation, The circuit breaker according to claim 1.

4. The start time of the second interrupting contact closing operation is after the completion time of the first interrupting contact closing operation, The circuit breaker according to claim 1.

5. The start time of the first interrupting contact closing operation is the same as the start time of the second interrupting contact closing operation, The circuit breaker according to claim 1.

6. an operating mechanism for operating the energized contact, the first interrupting contact, and the second interrupting contact including, The circuit breaker according to claim 1.

7. In the closing operation of the first interrupting contact, the closing speed of changing the first interrupting contact from the open state to the closed state is lower than the closing speed of changing the second interrupting contact from the open state to the closed state in the second interrupting contact closing operation and the closing speed of changing the energizing contact from the open state to the closed state in the energizing contact closing operation. The interrupting device according to claim 1.

8. The vacuum circuit breaker is a movable electrode installed on a movable energizing shaft of the vacuum circuit breaker, and a fixed electrode installed on a fixed energizing shaft of the vacuum circuit breaker arranged coaxially with the movable energizing shaft of the vacuum circuit breaker and includes it is configured to be in the closed state when the space between the movable electrode and the fixed electrode is in an electrically connected state, and to be in the open state when the space between the movable electrode and the fixed electrode is in an electrically insulated state. A spring is installed on the fixed energizing shaft of the vacuum circuit breaker. When the first interrupting contact is in the closed state, the movable electrode is pushed by the spring force of the spring to be in close contact with the fixed electrode. The interrupting device according to claim 1.

9. The gas circuit breaker is a movable energizing shaft of the gas circuit breaker on which a driving-side arc contact and a driving-side energizing contact are installed, and a fixed energizing shaft of the gas circuit breaker arranged coaxially with the movable energizing shaft of the gas circuit breaker and on which a counter-side arc contact and a counter-side energizing contact are installed and includes The energizing contact is configured to be in the closed state when the connection between the driving-side energizing contact and the counter-side energizing contact is established, and to be in the open state when the connection between the driving-side energizing contact and the counter-side energizing contact is in an insulating state. The second interrupting contact is configured to be in the closed state when the connection between the driving-side arc contact and the counter-side arc contact is established, and to be in the open state when the connection between the driving-side arc contact and the counter-side arc contact is in an insulating state. The interrupting device according to any one of claims 1 to 8.

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