WO2024252578A1 - Appareillage de commutation - Google Patents

Appareillage de commutation Download PDF

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Publication number
WO2024252578A1
WO2024252578A1 PCT/JP2023/021224 JP2023021224W WO2024252578A1 WO 2024252578 A1 WO2024252578 A1 WO 2024252578A1 JP 2023021224 W JP2023021224 W JP 2023021224W WO 2024252578 A1 WO2024252578 A1 WO 2024252578A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
electrodes
magnet
ferromagnetic body
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2023/021224
Other languages
English (en)
Japanese (ja)
Inventor
淳一 安部
敏宏 松永
耕一 香川
貴広 江戸
基宗 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2025525542A priority Critical patent/JPWO2024252578A1/ja
Priority to CN202380098671.3A priority patent/CN121285870A/zh
Priority to PCT/JP2023/021224 priority patent/WO2024252578A1/fr
Priority to TW112132558A priority patent/TWI860067B/zh
Publication of WO2024252578A1 publication Critical patent/WO2024252578A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/18—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • This application relates to an opening and closing device.
  • Switchgear a type of high-voltage distribution equipment, is used to interrupt current when high-voltage distribution equipment breaks down or becomes abnormal.
  • gas-insulated switchgear contains switching devices such as circuit breakers, disconnectors, and earthing switches that interrupt current by contacting and separating a pair of electrodes arranged opposite each other, housed in a container filled with insulating gas such as SF6 gas (sulfur hexafluoride gas) or dry air.
  • SF6 gas sulfur hexafluoride gas
  • dry air dry air.
  • the normal breaking method is a method of breaking the current by extending the path of the arc current generated when the contacts are opened using a driving device.
  • Known technologies for improving current interruption performance include the early-break method and the magnetic drive method.
  • the early-break method is a method in which a quick-acting mechanism is provided on one side of the electrodes, and the opening speed of the electrodes is increased to extend the arc to the length required for extinguishing within a time period in which the electrode contacts are not damaged, thereby obtaining interruption performance.
  • the magnetic drive method is a method in which a magnet is installed inside the switchgear to magnetically drive the arc, thereby obtaining interruption performance.
  • a second electrode that can be driven to move toward and away from a first electrode, and electrical continuity between the electrodes is maintained by the attractive force of magnets arranged inside each electrode.
  • the first terminal and the second terminal are opened by separating the first electrode from the second electrode, and the first electrode is connected to the first terminal by a spring.
  • This opening of the circuit between the first terminal and the second terminal utilizes the attractive force of the magnet between the first electrode and the second electrode that is driven in the opening direction while maintaining electrical continuity, and the restoring force of the spring that connects the first electrode.
  • An arc generated by the separation of the first electrode from the second electrode rotates in the circumferential direction of the electrodes due to the magnetic field created by the magnet, and is interrupted by being stretched and cooled (see, for example, Patent Document 1).
  • the arc generated when the current is interrupted is rotated in the circumferential direction of the electrodes by the magnetic field created by the magnet, and the opening speed of the electrodes is increased by the restoring force of the spring that holds the first electrode, and the arc is extinguished by instantly extending the path.
  • the magnetic attraction force of the magnets arranged inside the first electrode and the second electrode is weak, the contact between the first electrode and the second electrode may be released before the restoring force of the spring that holds the first electrode is charged, and sufficient opening speed may not be obtained, resulting in a deterioration in the interruption performance of the arc.
  • the present application discloses a technique for solving the above-mentioned problems, and has an object to provide a low-cost switching device while ensuring arc interruption performance.
  • the opening and closing device disclosed in the present application is A switching device including a pair of electrodes arranged with their electrode surfaces facing each other in a first direction and movable toward and away from each other in the first direction, Each of the electrodes has a receiving hole recessed from the electrode surface, A magnet is accommodated in the accommodation hole of each of the electrodes so that the electrodes have opposing polarities that attract each other due to magnetic force; A ferromagnetic body is disposed on each of the magnets housed in each of the electrodes on a surface of the magnet that faces the electrodes, the magnet surface being covered with the ferromagnetic body, and a first substance having a relative permeability lower than that of the ferromagnetic body is disposed adjacent to a magnet side surface of each of the magnets along the first direction. It is something.
  • the switching device disclosed in this application provides a low-cost switching device while ensuring arc interruption performance.
  • FIG. 1 is a cross-sectional view showing a schematic configuration of a switching device according to a first embodiment.
  • 4 is a conceptual diagram for explaining magnetic characteristics in the switching device according to the first embodiment.
  • FIG. FIG. 4 is a cross-sectional view showing another configuration of the switching device according to the first embodiment.
  • FIG. 11 is a cross-sectional view showing a schematic configuration of a switching device according to a second embodiment.
  • FIG. 11 is a cross-sectional view showing a schematic configuration of a switching device according to a third embodiment.
  • FIG. 11 is a conceptual diagram showing a current path in a switching device according to a third embodiment.
  • FIG. 1 is a cross-sectional view showing a schematic configuration of a switching device 100 according to a first embodiment.
  • the switching device 100 includes a pair of electrodes, a first electrode 1A and a second electrode 1B, which are movable toward and away from each other.
  • the first electrode 1A and the second electrode 1B are cylindrical and are housed inside hollow cylindrical first terminals 2A and second terminals 2B, respectively.
  • FIG. 1 shows a state in which the first electrode 1A and the second electrode 1B are separated from each other.
  • first electrode 1A and second electrode 1B are indicated as X and Y, respectively.
  • electrode 1A and Y are indicated as electrode 1A and Y, respectively.
  • the first electrode 1A and the second electrode 1B have respective electrode surfaces SA and SB facing each other in the axial direction X as a first direction, on which accommodating holes HA and HB are formed, which are recessed in the axial direction X.
  • Cylindrical magnets 10 are accommodated in the accommodating holes HA and HB, respectively.
  • the magnet 10 has a side cover 21 attached to its side along the axial direction X, and is fixed to the inner circumferential surfaces of the receiving holes HA, HB by this side cover 21.
  • a facing cover 20 is disposed on each of the magnet surfaces 10S of the magnet 10 of the first electrode 1A and the magnet surface 10S of the magnet 10 of the second electrode 1B, which face each other in the axial direction X, to cover these magnet surfaces 10S.
  • the magnets 10 provided on the first electrode 1A and the second electrode 1B are arranged so that when the first electrode 1A and the second electrode 1B are brought close to each other, the magnetic poles that attract each other due to magnetic force face each other.
  • the S pole is arranged on the electrode surface SA side of the first electrode 1A
  • the N pole is arranged on the electrode surface SB side of the second electrode 1B.
  • the material of the facing cover 20 is a ferromagnetic material such as iron or nickel.
  • the material of the side cover 21 is a first material that has a lower relative permeability than ferromagnetic materials such as iron or nickel.
  • the first material that constitutes the side cover 21 is a non-magnetic material such as aluminum or stainless steel that has a relative permeability of 10 or less.
  • the first electrode 1A and the second electrode 1B are supported by guide parts (not shown) inside the hollow cylindrical first terminal 2A and second terminal 2B so that they can move in the axial direction X. Furthermore, the second electrode 1B is connected to a drive device (not shown) that drives the second electrode 1B in the axial direction X so that it can come into contact with and separate from the first electrode 1A.
  • a contact 5A is provided on the outer circumferential surface of the first electrode 1A, and a contact 5B is provided on the outer circumferential surface of the second electrode 1B.
  • the first electrode 1A and the second electrode 1B are electrically connected to a first terminal 2A and a second terminal 2B that are provided on the outer side in the radial direction Y.
  • a movement stopper 7 is attached to the outer circumferential surface of the first electrode 1A.
  • an outer end face 7OUT of the movement stopper 7 in the radial direction Y comes into sliding contact with the inner circumferential surface of the first terminal 2A.
  • a fixed stopper 6 is attached to the inner peripheral surface of the first terminal 2A.
  • a spring 8 is provided between the moving stopper 7 and the fixed stopper 6, and the spring 8 expands and contracts in response to the movement of the first electrode 1A in the axial direction X.
  • the driving device moves the second electrode 1B in the axial direction X1, which is the direction of the arrow D, so that the second electrode 1B comes into contact with the first electrode 1A and is conductive.
  • the contact between the first electrode 1A and the second electrode 1B is maintained by the magnetic attraction force between the magnets 10 provided on the first electrode 1A and the second electrode 1B, respectively.
  • the drive device moves the second electrode 1B toward the other axial direction X2, which is the opposite direction of the arrow D.
  • the first electrode 1A is kept in contact with the second electrode 1B by the magnetic attraction force of the magnet 10, so it moves toward the other axial direction X2 together with the second electrode 1B while maintaining its contact with the second electrode 1B.
  • the movement stopper 7 fixed to the first electrode 1A also moves toward the other axial direction X2, so the spring 8 is compressed and its restoring force is stored.
  • the magnetic attraction between the first electrode 1A and the second electrode 1B is released when the restoring force of the spring 8 and the magnetic force between the magnets 10 are balanced, and the first electrode 1A moves vigorously in the one axial direction X1 as the spring 8 returns to its original position, opening the electrodes.
  • the opening speed between the first electrode 1A and the second electrode 1B increases, so that the current path can be extended to the length required for arc extinguishing within a time period in which the electrode 1 is not damaged, and high arc current interruption performance can be obtained.
  • FIG. 2 is a conceptual diagram for explaining the magnetic characteristics of the electrode 1 in the switching device 100 according to the first embodiment when the electrodes are closed.
  • the switching device 100 of this embodiment has a facing cover 20 made of a ferromagnetic material disposed on each of the magnet surfaces 10S that face each other between the electrodes 1.
  • a side cover 21 made of aluminum, stainless steel, or the like as a first material having a lower relative magnetic permeability than the facing cover 20 is disposed adjacent to the magnet side surface of the magnet 10.
  • the inventors of the present application have repeatedly analyzed the magnetic properties of the opening and closing device 100 configured in this way, and have discovered that the magnetic attraction force of the magnet 10 between the electrodes 1 is large. This is thought to be because in the opening and closing device 100 of this embodiment, a magnetic circuit is not formed by the magnetic flux M2 passing through the inside of the side cover 21 of the magnet 10 as shown in Figure 2, and as a result, the magnetic flux density of the magnetic flux M1 having a component parallel to the axial direction X between the electrodes 1 is large.
  • the arc current flowing between the electrodes 1 bulges outward in the radial direction Y. That is, the arc current flows at an angle of a certain angle or more with respect to the magnetic flux M1 having an axial component X. Therefore, when the magnetic flux density of the magnetic flux M1 having the axial component X between the electrodes 1 is increased in this way, the radial and circumferential Lorentz forces acting on the arc current also increase.
  • the inventors of the present application have discovered that this makes it possible to quickly rotate the arc generated between the electrodes 1 on the outer periphery of the electrodes 1 in the radial direction Y, thereby extinguishing the arc.
  • the opening and closing device 100 of this embodiment has a configuration that can supply the strong magnetic field required for extinguishing the arc to the arc as soon as the pair of electrodes 1 are separated.
  • the inventors discovered that the adhesion of magnetic foreign matter generated by the arc to the facing cover 20 is suppressed. This is thought to be because, as described above, the Lorentz force in the radial outward direction Y increases, causing the arc current to move quickly from above the facing cover 20 to the outer periphery of the electrode 1 on the outside in the radial direction Y. In this way, unevenness caused by foreign matter is prevented from adhering to the surface of the electrode 1, ensuring a reliable state of contact between the electrodes 1 and suppressing demagnetization and damage to the magnet 10 caused by the arc.
  • FIG. 3 is a partially enlarged cross-sectional view showing another configuration example of the switching device 100 according to the first embodiment.
  • the length W1 in the radial direction Y which is a direction perpendicular to the axial direction X of the facing cover 20, is configured to be smaller by a set dimension than the length W2 in the radial direction Y of the magnet 10.
  • the length W1 in the radial direction Y of the facing cover 20 is configured to be approximately 5% to 12% smaller than the length W2 in the radial direction Y of the magnet 10.
  • the first material constituting the side cover 21 arranged on the side of the magnet 10 may be any material that has a lower relative magnetic permeability than the facing cover 20 made of a ferromagnetic material, and may be, for example, a gas or an insulator.
  • a gas is disposed on the side surface of magnet 10 as the first substance, a gap may be provided between magnet 10 and the inner peripheral surfaces of accommodation holes HA and HB.
  • a configuration in which magnet 10 is fixed to the bottom surfaces of accommodation holes HA and HB with an adhesive or the like may be considered.
  • the side cover 21 does not need to be provided. In this case, the electrode 1 itself becomes the first material that is arranged on the side of the magnet 10.
  • the length of the side cover 21 in the axial direction X is shown to be a length that covers the entire side surface of the magnet 10, but is not limited to this. Even if the side cover 21 is shorter than the length of the axial direction X of the magnet 10, as long as it covers at least a part of the electrode surfaces SA and SB of the side surface of the magnet 10, the above-mentioned effect is achieved. Furthermore, the side cover 21 does not need to be attached around the entire circumference of the side of the magnet 10, and the same effect can be achieved by attaching it to only a portion of the circumference of the side of the magnet 10.
  • a switching device including a pair of electrodes arranged with their electrode surfaces facing each other in a first direction and movable toward and away from each other in the first direction, Each of the electrodes has a receiving hole recessed from the electrode surface, A magnet is accommodated in the accommodation hole of each of the electrodes so that the electrodes have opposing polarities that attract each other due to magnetic force; A ferromagnetic body is disposed on each of the magnets housed in each of the electrodes on a surface of the magnet that faces the electrodes, the magnet surface being covered with the ferromagnetic body, and a first substance having a relative permeability lower than that of the ferromagnetic body is disposed adjacent to a magnet side surface of each of the magnets along the first direction. It is something.
  • a ferromagnetic material is disposed on the surface of the magnets provided on each electrode, and a first material with a lower relative magnetic permeability than the ferromagnetic material is disposed on the side of the magnet.
  • the magnetic flux density with the axial component X between the electrodes is increased, so that the arc can be quickly extinguished. This prevents the magnetic force of the magnet from decreasing due to the arc, ensures a stable magnetic attraction force, and stabilizes the current interruption performance. It also has the effect of mitigating the electric field and protecting the electrodes from damage caused by the arc.
  • the length of the ferromagnetic body in the direction perpendicular to the first direction is configured to be smaller by a set dimension than the length of the magnet in the direction perpendicular to the first direction.
  • the length of the ferromagnetic material in a direction perpendicular to the first direction is configured to be greater than the length of the ferromagnetic material in the first direction.
  • the magnetic flux density between the electrodes with a component parallel to the X-axis can be increased.
  • FIG. 4 is a cross-sectional view showing a schematic configuration of a switching device 200 according to the second embodiment.
  • the facing covers 20 provided on each electrode 1 are each formed with a recess 20G recessed in the axial direction X.
  • the contact area between the facing covers 20 is reduced when the electrode 1 is closed, so that the magnetic flux density passing through the facing covers 20 can be increased, and the magnetic attraction force of the magnet 10 between the electrodes 1 can be increased. This makes it possible to miniaturize the magnet.
  • the contact area between the facing covers 20 can be reduced.
  • the contact area between the facing covers 20 is adjusted taking magnetic saturation into consideration.
  • the inventors of the present application discovered that by configuring the opening and closing device 200 as follows, the magnetic adhesion force, which is the force by which the magnets 10 attract each other between the electrodes 1, can be increased. That is, the depth W4 in the axial direction X of the recess 20G of the facing cover 20 is configured to be smaller than the length W1 in the radial direction Y, which is a direction perpendicular to the X-axis of the facing cover 20.
  • At least one of the ferromagnetic bodies disposed on each of the electrodes has a recess formed therein that is recessed from a surface facing the electrodes. It is something.
  • the depth of the recess in the ferromagnetic body in the first direction is configured to be smaller than the length of the ferromagnetic body in a direction perpendicular to the first direction. It is something. This makes it possible to further increase the magnetic attraction force of the magnet, thereby enabling the magnet to be made smaller, lighter, and less expensive.
  • FIG. 5 is a cross-sectional view showing a schematic configuration of a switching device 300 according to the third embodiment.
  • FIG. 6 is a conceptual diagram showing a current path in a switching device 300 according to the third embodiment.
  • an insulating tape 22 is disposed as an insulator between the side surface of the magnet 10 and the inner walls of the accommodation holes HA and HB.
  • the electrode 1 When the electrode 1 is opened, if the arc is ignited not between the electrode surfaces SA and SB of the electrode 1 but between the side cover 21, the current may flow from the magnet 10 to the facing cover 20 to the electrode 1. In this case, the magnet 10 is demagnetized by the current, and the magnetic attraction force decreases.
  • the current i flows in a path that avoids the magnet 10, as shown in FIG.
  • the insulating tape 22 may be provided between the magnet 10 and the side cover 21, or may be provided between the outside of the side cover 21 and the inner walls of the receiving holes HA, HB. Even when insulating tape 22 is provided between the outside of side cover 21 and the inner walls of accommodating holes HA and HB, current can be prevented from flowing from the electrode 1 side to the magnet 10 side, thereby preventing demagnetization of the magnet.
  • An insulator is disposed between the magnet and the inner wall of the receiving hole. It is something. This makes it possible to prevent the magnet from being demagnetized by the current and the magnetic attraction force from decreasing, thereby ensuring a stable magnetic attraction force between the electrodes.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

L'invention concerne un appareillage de commutation (100) qui est pourvu d'une paire d'électrodes (1A, 1B) qui sont disposées de telle sorte que des surfaces d'électrode (SA, SB) sont opposées dans une première direction et qui peuvent être rapprochées l'une de l'autre et écartées l'une de l'autre dans la première direction. Des trous de logement (HA, HB) indentés à partir des surfaces d'électrode (SA, SB) sont formés dans chacune des électrodes (1A, 1B). Des aimants (10) sont respectivement logés dans les trous de logement (HA, HB) des électrodes (1A, 1B) de manière à avoir des polarités opposées attirées magnétiquement l'une à l'autre entre les électrodes (1A, 1B). Des ferro-aimants (20) destinés à couvrir des surfaces d'aimant (10S) sont respectivement disposés sur les surfaces d'aimant (10S) qui font partie des aimants (10) logés respectivement dans les électrodes (1A, 1B) et qui sont opposés entre les électrodes (1A, 1B). Des premières substances (21) ayant une perméabilité magnétique relative inférieure à celle des ferro-aimants (20) sont disposées à proximité d'une surface latérale d'aimant des aimants (10) qui s'étend le long de la première direction.
PCT/JP2023/021224 2023-06-07 2023-06-07 Appareillage de commutation Pending WO2024252578A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2025525542A JPWO2024252578A1 (fr) 2023-06-07 2023-06-07
CN202380098671.3A CN121285870A (zh) 2023-06-07 2023-06-07 开关装置
PCT/JP2023/021224 WO2024252578A1 (fr) 2023-06-07 2023-06-07 Appareillage de commutation
TW112132558A TWI860067B (zh) 2023-06-07 2023-08-29 開閉裝置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/021224 WO2024252578A1 (fr) 2023-06-07 2023-06-07 Appareillage de commutation

Publications (1)

Publication Number Publication Date
WO2024252578A1 true WO2024252578A1 (fr) 2024-12-12

Family

ID=93795344

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/021224 Pending WO2024252578A1 (fr) 2023-06-07 2023-06-07 Appareillage de commutation

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JP (1) JPWO2024252578A1 (fr)
CN (1) CN121285870A (fr)
TW (1) TWI860067B (fr)
WO (1) WO2024252578A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57197144U (fr) * 1981-06-11 1982-12-14
WO1994014177A1 (fr) * 1992-12-16 1994-06-23 Nu-Lec Pty. Ltd. Appareil interrupteur et procede pour interrompre un arc
JP2010251056A (ja) * 2009-04-14 2010-11-04 Mitsubishi Electric Corp 開閉器
JP2012069300A (ja) * 2010-09-21 2012-04-05 Toshiba Corp 開閉装置
JP2020042985A (ja) * 2018-09-11 2020-03-19 日新電機株式会社 ガス遮断器
JP7162782B1 (ja) * 2022-03-31 2022-10-28 三菱電機株式会社 開閉装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5948176B2 (ja) * 2012-07-24 2016-07-06 株式会社日立製作所 開閉器
KR101992736B1 (ko) * 2015-04-22 2019-06-26 엘에스산전 주식회사 진공 인터럽터의 접점부
TWI669740B (zh) * 2018-06-08 2019-08-21 宏碁股份有限公司 旋鈕裝置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57197144U (fr) * 1981-06-11 1982-12-14
WO1994014177A1 (fr) * 1992-12-16 1994-06-23 Nu-Lec Pty. Ltd. Appareil interrupteur et procede pour interrompre un arc
JP2010251056A (ja) * 2009-04-14 2010-11-04 Mitsubishi Electric Corp 開閉器
JP2012069300A (ja) * 2010-09-21 2012-04-05 Toshiba Corp 開閉装置
JP2020042985A (ja) * 2018-09-11 2020-03-19 日新電機株式会社 ガス遮断器
JP7162782B1 (ja) * 2022-03-31 2022-10-28 三菱電機株式会社 開閉装置

Also Published As

Publication number Publication date
CN121285870A (zh) 2026-01-06
TW202449820A (zh) 2024-12-16
JPWO2024252578A1 (fr) 2024-12-12
TWI860067B (zh) 2024-10-21

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