EP3872829B1 - Gasschutzschalter - Google Patents

Gasschutzschalter Download PDF

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Publication number
EP3872829B1
EP3872829B1 EP19877047.1A EP19877047A EP3872829B1 EP 3872829 B1 EP3872829 B1 EP 3872829B1 EP 19877047 A EP19877047 A EP 19877047A EP 3872829 B1 EP3872829 B1 EP 3872829B1
Authority
EP
European Patent Office
Prior art keywords
puffer chamber
circuit breaker
gas circuit
axis line
gas
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.)
Active
Application number
EP19877047.1A
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English (en)
French (fr)
Other versions
EP3872829A4 (de
EP3872829A1 (de
Inventor
Motohiro Sato
Daisaku Yamada
Yasunori Nakamura
Shimpei NAKA
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
Publication of EP3872829A1 publication Critical patent/EP3872829A1/de
Publication of EP3872829A4 publication Critical patent/EP3872829A4/de
Application granted granted Critical
Publication of EP3872829B1 publication Critical patent/EP3872829B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • H01H33/703—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle having special gas flow directing elements, e.g. grooves, extensions
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H2033/888—Deflection of hot gasses and arcing products
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H2033/908—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism using valves for regulating communication between, e.g. arc space, hot volume, compression volume, surrounding volume
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7076—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by the use of special materials
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/76—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism

Definitions

  • the present invention relates to a gas circuit breaker that performs an opening operation for power interruption and a closing operation for power supply.
  • a conventional gas circuit breaker includes a mechanical compression chamber (mechanical puffer chamber) and a thermally pressurizing chamber (thermal puffer chamber).
  • the mechanical puffer chamber includes a mechanism that mechanically compresses an insulating gas in the mechanical puffer chamber and blows, in current interruption, the compressed insulating gas onto an arc discharge generated between contacts.
  • arc discharge an area where the arc discharge is occurring is also referred to simply as "arc discharge”.
  • the thermal puffer chamber plays a role of pressurizing the insulating gas by means of thermal energy of the arc discharge and blowing the pressurized insulating gas onto the arc discharge .
  • the thermal puffer chamber is disposed in a passage for the insulating gas that comes from the mechanical puffer chamber and thus can inhibit, in the low -current interruption duty, the pressure rise of the insulating gas in the mechanical puffer chamber. Moreover, the gas flows from the mechanical puffer chamber at a reduced speed toward the arc discharge. This may contribute to a decline in the interruption performance of the gas circuit breaker.
  • the present invention has been made to solve these problems, and an object of the present invention is to provide a gas circuit breaker that is capable of suppressing a decline in current interruption performance even in a low-current interruption duty.
  • the gas circuit breaker according to the present invention is capable of suppressing a decline in current interruption performance even in a low-current interruption duty and thus has higher current interruption performance.
  • the stationary electrode 1 is electrically connected to one terminal (not illustrated) external to the tank 10.
  • the movable electrode 2 is electrically connected to another terminal (not illustrated) external to the tank 10.
  • a space between the movable housing 3 and the movable electrode 2 serves as a first suck-out port Mnu through which the insulating gas is taken into the mechanical puffer chamber Mp and is ejected out of the mechanical puffer chamber Mp.
  • a cooling cylinder 5 is connected to the stationary electrode 1 and radiates generated heat of the stationary electrode 1 into the interior 10n of the tank 10.
  • a stationary housing 6 is attached to the cooling cylinder 5 and fits over the movable housing 3 so that the connection between the stationary electrode 1 and the movable electrode 2 is supported.
  • the stationary electrode 1, the cooling cylinder 5, and the stationary housing 6 compose a stationary part 11.
  • the movable housing 3 is a first movable housing described in the claims
  • the cylinder 8 is a second movable housing described in the claims.
  • the intake ports 7n of the nozzle 7 are four in number and each intake port 7n opens in a direction parallel to the axis line A.
  • the first suck-out port Mnu opens in a direction parallel to the axis line A.
  • the intake ports 7n illustrated in FIG. 1 face the first suck-out port Mnu.
  • FIG. 5 illustrates time dependence of parameters during the operation of the gas circuit breaker 100;
  • FIG. 5 (a) illustrates the time dependence of alternating current flowing between the stationary electrode 1 and the movable electrode 2; and
  • FIG. 5 (b) illustrates varying distance between a leading end of the stationary electrode 1 and a leading end of the movable electrode 2 (interelectrode distance D).
  • FIG. 6 is a sectional view illustrating a state of a main part of the gas circuit breaker 100 before a time T0 shown in FIG. 5 .
  • FIG. 7 is a sectional view illustrating a state of the main part of the gas circuit breaker 100 from after a time T1 through a time T2 shown in FIG. 5 .
  • FIG. 8 is a sectional view illustrating a state of the main part of the gas circuit breaker 100 from after the time T2 through the time T3 shown in FIG. 5 .
  • FIG. 9 is a cross section taken at the position along dotted-and-dashed line C2 as with FIG. 3 , illustrating the state of the gas circuit breaker 100 from after the time T2 through the time T3.
  • FIG. 10 illustrates temperature distribution of the insulating gas along the axis line A at a fixed time that comes after the time T2 and before the time T3 with a vertical axis representing temperature of the insulating gas and with a horizontal axis representing positions along the axis line A.
  • FIG. 11 is a sectional view illustrating a state of the main part of the gas circuit breaker 100 after a time T4 shown in FIG. 5 .
  • the alternating current flows steadily between the stationary electrode 1 and the movable electrode 2.
  • the interelectrode distance D illustrated in FIG. 6 is shown as a distance between the leading end of the stationary electrode 1 and the leading end of the movable electrode 2. With the stationary electrode 1 and the movable electrode 2 fitted together and touching each other at their respective leading ends, the interelectrode distance D is defined as a negative value.
  • the interelectrode distance D approximates a value of zero.
  • the interelectrode distance D is defined as a positive value.
  • a distance Dt is a length component along the axis line A between the leading end of the movable electrode 2 and center of the squirt holes 7u of the nozzle 7.
  • the interelectrode distance D is a negative value, and the stationary electrode 1 and the movable electrode 2 touch each other, the alternating current directly flows between the stationary electrode 1 and the movable electrode 2 without via an arc discharge E.
  • the interelectrode distance D becomes a positive value, and the stationary electrode 1 and the movable electrode 2 become separated. Therefore, the current flows between the stationary electrode 1 and the movable electrode 2 through the arc discharge E.
  • the insulating gas near the arc discharge E is heated, and pressure of the insulating gas increases. Accordingly, an insulating gas flow Se having a direction toward the movable housing 3 is generated in the vicinity of the arc discharge E.
  • Amount of heat generated by the arc discharge E increases with an increasing absolute value of the current.
  • the alternating current reaches maximum absolute values (a minimum current value and a maximum current value), so that the amount of heat generated by the arc discharge E increases sharply. Accordingly, the pressure of the insulating gas increases sharply, and the gas flow Se also increases sharply.
  • the gas flow Smn and the gas flow Stn similarly increase sharply. With the gas flow Smn entering the mechanical puffer chamber Mp through the first suck-out port Mnu, internal pressure of the mechanical puffer chamber Mp increases sharply. With the gas flowStn entering the first thermal puffer chamber Tp through the intake ports 7n, internal pressure of the first thermal puffer chamber Tp also increases sharply.
  • FIGS. 5 and 8 As the gas circuit breaker 100 progresses with the current interruption operation, the interelectrode distance D increases further. In other words, the volume of the mechanical puffer chamber Mp is compressed in proportion as the interelectrode distance D increases.
  • the gas flow Smu is ejected through the first suck-out port Mnu toward the intake ports 7n. For this reason, a leakage of the insulating gas through each of the intake ports 7n toward the first suck-out port Mnu is suppressed. Accordingly, volume of the gas flow Stu that squirts out through the squirt holes 7u of the nozzle 7 advantageously increases.
  • the interelectrode distance D increases further and becomes greater than the distance Dt.
  • the squirt holes 7u of the nozzle 7 pass the leading end of the stationary electrode 1. Therefore, during the movement of the movable part 21, the gas flow Stu strike the arc discharge E so that the arc discharge E is struck from sideways relative to the discharge direction.
  • the four squirt holes 7v1 to 7v4 open from the lateral side of the axis line A.
  • the opening direction v1 of the squirt hole 7v1 is not arranged in the same plane as the axis line A and is not arranged to intersect the axis line A. In other words, the opening direction v1 of the squirt hole 7v1 and the axis line A are arranged in twisted positions from each other.
  • the opening direction v2 of the squirt hole 7v2 and the axis line A are arranged in twisted positions from each other; the opening direction v3 of the squirt hole 7v3 and the axis line A are arranged in twisted positions from each other; and the opening direction v4 of the squirt hole 7v4and the axis line A are arranged in twisted positions from each other.
  • a partition 12 is formed on an inner wall surface of the movable housing 3, dividing an internal space of the movable housing 3 into the mechanical puffer chamber Mp and the second thermal puffer chamber Tp2.
  • the mechanical puffer chamber Mp is a space enclosed by the partition 12, the movable housing 3, the piston 4, and the movable electrode 2.
  • the second thermal puffer chamber Tp2 is a space enclosed with the partition 12, the movable housing 3, and the movable electrode 2.
  • the mechanical puffer chamber Mp, the second thermal puffer chamber Tp2, and the first thermal puffer chamber Tp are disposed in series along the axis line A.
  • a second suck-out port Mnv is formed on an opposite side of the partition 12 sandwiching the second thermal puffer chamber Tp2 in-between.
  • the second suck-out port Mnv serves as a passage for the insulating gas.
  • the insulating gas flows into the second thermal puffer chamber Tp2 through the second suck-out port Mnv.
  • the insulating gas also flows out of the second thermal puffer chamber Tp2 through the second suck-out port Mnv.
  • the second suck-out port Mnv is formed between the movable electrode 2 and a part of the nozzle 7 that touches the inner wall surface of the movable housing 3.

Landscapes

  • Circuit Breakers (AREA)

Claims (11)

  1. Gasschutzschalter (100, 101), der einen Tank (10) beinhaltet, der mit einem Isoliergas gefüllt ist, wobei der Tank (10) Folgendes umfasst:
    eine stationäre Elektrode (1), die leitfähig ist,
    eine bewegliche Elektrode (2), die dazu ausgelegt ist, entlang einer Achsenlinie (A) der stationären Elektrode (1) beweglich zu sein und mit der stationären Elektrode (1) verbindbar und von dieser trennbar zu sein;
    ein erstes bewegliches Gehäuse (3), das dazu ausgelegt ist, mit der beweglichen Elektrode (2) ineinanderzugreifen und die Achsenlinie (A) zu umgeben;
    einen Kolben (4), der dazu ausgelegt ist, eine mechanische Pufferkammer (Mp) mit dem ersten beweglichen Gehäuse (3) auszubilden,
    ein zweites bewegliches Gehäuse (8), das dazu ausgelegt ist, mit der beweglichen Elektrode (2) ineinanderzugreifen und mit dem ersten beweglichen Gehäuse (3) entlang der Achsenlinie (A) in Reihe positioniert zu sein; und
    eine Düse (7), die dazu ausgelegt ist, eine erste Wärmepufferkammer (Tp) mit dem zweiten beweglichen Gehäuse (8) auszubilden, wobei
    das erste bewegliche Gehäuse (3) eine erste Absaugöffnung (Mnu) beinhaltet, die dazu ausgelegt ist, zu ermöglichen, dass das Isoliergas in die mechanische Pufferkammer (Mp) aufgenommen wird, und zu ermöglichen, dass das Isoliergas aus der mechanischen Pufferkammer (Mp) ausgestoßen wird, und
    die Düse (7) eine Einlassöffnung (7n) beinhaltet, die dazu ausgelegt ist, zu ermöglichen, dass das Isoliergas in die erste Wärmepufferkammer (Tp) aufgenommen wird, und durch eine Spritzöffnung (7u) gekennzeichnet ist, die dazu ausgelegt ist, zu ermöglichen, dass das Isoliergas aus der ersten Wärmepufferkammer (Tp) in Richtung einer Position zwischen der stationären Elektrode (1) und der beweglichen Elektrode (2) gespritzt wird.
  2. Gasschutzschalter (100, 101, 102) nach Anspruch 1, wobei
    eine Trennwand (12) dazu ausgelegt ist, sich an einer Innenwandfläche des ersten beweglichen Gehäuses (3) auszubilden, und dazu ausgelegt ist, einen Innenraum des ersten beweglichen Gehäuses (3) in die mechanische Pufferkammer (Mp) und eine zweite Wärmepufferkammer (Tp2) zu unterteilen,
    die Trennwand (12) die erste Absaugöffnung (Mnu) beinhaltet, die als eine Verbindung zwischen der mechanischen Pufferkammer (Mp) und der zweiten Wärmepufferkammer (Tp2) dient,
    die mechanische Pufferkammer (Mp) auf einer gegenüberliegenden Seite der ersten Wärmepufferkammer (Tp) angeordnet ist, sodass die zweite Wärmepufferkammer (Tp2) dazwischen entlang der Achsenlinie (A) eingefügt ist, und
    das erste bewegliche Gehäuse (3) eine zweite Absaugöffnung (Mnw) auf einer gegenüberliegenden Seite der Trennwand (12) beinhaltet, sodass die zweite Wärmepufferkammer (Tp2) dazwischen eingefügt ist, wobei die zweite Absaugöffnung (Mnv) dazu ausgelegt ist, zu ermöglichen, dass das Isoliergas in die zweite Wärmepufferkammer (Tp2) aufgenommen wird, und zu ermöglichen, dass das Isoliergas aus der zweiten Wärmepufferkammer (Tp2) in Richtung einer Position zwischen der stationären Elektrode (1) und der beweglichen Elektrode (2) ausgestoßen wird.
  3. Gasschutzschalter (100, 101, 102) nach Anspruch 1 oder 2, wobei in einem Querschnitt bei von der Seite betrachteter Achsenlinie (A) die mechanische Pufferkammer (Mp) und die erste Wärmepufferkammer (Tp) entlang der Achsenlinie (A) in Reihe angeordnet sind.
  4. Gasschutzschalter (100, 101) nach Anspruch 1, wobei die erste Absaugöffnung (Mnu) und die Einlassöffnung (7n) einander zugewandt sind.
  5. Gasschutzschalter (100, 101, 102) nach einem der Ansprüche 1 bis 4, wobei bei einem Bewegungsvorgang der beweglichen Elektrode (2) aus einem Zustand, in dem die bewegliche Elektrode (2) und die stationäre Elektrode (1) verbunden sind, eine Öffnungsposition der Spritzöffnung (7u, 7v, 7v1 bis 7v4) ein vorderes Ende der stationären Elektrode (1) passiert.
  6. Gasschutzschalter (100, 101, 102) nach einem der Ansprüche 1 bis 5, wobei die Spritzöffnung (7u) dazu ausgelegt ist, sich von einer seitlichen Seite der Achsenlinie (A) zu öffnen, und derart ausgelegt ist, dass sie die Achsenlinie (A) in einer Ebene schneidet, welche die Öffnungsrichtung jeder Spritzöffnung (7u) und die Achsenlinie (A) beinhaltet.
  7. Gasschutzschalter (100, 101, 102) nach einem der Ansprüche 1 bis 5, wobei die Spritzöffnung (7v, 7v1 bis 7v4) dazu ausgelegt ist, sich von einer seitlichen Seite der Achsenlinie (A) zu öffnen, und eine Öffnungsrichtung der Spritzöffnung (7v, 7v1 bis 7v4) so angeordnet ist, dass sie die Achsenlinie (A) nicht schneidet.
  8. Gasschutzschalter (100, 101, 102) nach einem der Ansprüche 1 bis 7, wobei die erste Wärmepufferkammer (Tp) unter Verwendung eines ablativen Materials ausgebildet ist.
  9. Gasschutzschalter (100, 101, 102) nach einem der Ansprüche 1 bis 7, wobei ein ablatives Material im Inneren der ersten Wärmepufferkammer (Tp) angeordnet ist.
  10. Gasschutzschalter (100, 101, 102) nach Anspruch 8 oder 9, wobei das ablative Material Polytetrafluorethylen oder ein Perfluoralkylvinylethercopolymer ist.
  11. Gasschutzschalter (100, 101, 102) nach Anspruch 8 oder 9, wobei das ablative Material mindestens eine Verbindung ist, die ausgewählt ist aus der Gruppe bestehend aus einem Perfluoretherpolymer, einem Fluorelastomer und einem cyclisierten 4-Vinyloxy-1-buten-Polymer.
EP19877047.1A 2018-10-24 2019-09-24 Gasschutzschalter Active EP3872829B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018200097 2018-10-24
PCT/JP2019/037360 WO2020084984A1 (ja) 2018-10-24 2019-09-24 ガス遮断器

Publications (3)

Publication Number Publication Date
EP3872829A1 EP3872829A1 (de) 2021-09-01
EP3872829A4 EP3872829A4 (de) 2021-12-22
EP3872829B1 true EP3872829B1 (de) 2024-07-10

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EP19877047.1A Active EP3872829B1 (de) 2018-10-24 2019-09-24 Gasschutzschalter

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EP (1) EP3872829B1 (de)
JP (1) JP6961105B2 (de)
WO (1) WO2020084984A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024124633A (ja) * 2023-03-03 2024-09-13 株式会社東芝 ガス遮断器

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946180A (en) * 1974-04-22 1976-03-23 I-T-E Imperial Corporation Downstream injection nozzle for puffer circuit interrupter
DE2710868A1 (de) * 1977-03-12 1978-09-14 Licentia Gmbh Autopneumatischer leistungsschalter mit isolierstoffduese
JPS5916234A (ja) * 1982-07-19 1984-01-27 株式会社富士電機総合研究所 ガスしや断器のしや断室
JPS61118919A (ja) * 1984-11-14 1986-06-06 株式会社東芝 ガス絶縁遮断器
JPH04284319A (ja) * 1991-03-13 1992-10-08 Hitachi Ltd ガス遮断器
JP3132573B2 (ja) * 1991-03-18 2001-02-05 富士電機株式会社 パッファ形ガス遮断器
JP2003297200A (ja) 2002-04-01 2003-10-17 Toshiba Corp ガス遮断器
JP2012054097A (ja) * 2010-09-01 2012-03-15 Mitsubishi Electric Corp ガス遮断器
JP5328991B2 (ja) * 2010-12-07 2013-10-30 三菱電機株式会社 ガス遮断器

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WO2020084984A1 (ja) 2020-04-30
EP3872829A4 (de) 2021-12-22
JPWO2020084984A1 (ja) 2021-04-30
EP3872829A1 (de) 2021-09-01
JP6961105B2 (ja) 2021-11-05

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