EP0450567B1 - High- or medium voltage circuit breaker with abutting arcing contacts - Google Patents

High- or medium voltage circuit breaker with abutting arcing contacts Download PDF

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Publication number
EP0450567B1
EP0450567B1 EP91105182A EP91105182A EP0450567B1 EP 0450567 B1 EP0450567 B1 EP 0450567B1 EP 91105182 A EP91105182 A EP 91105182A EP 91105182 A EP91105182 A EP 91105182A EP 0450567 B1 EP0450567 B1 EP 0450567B1
Authority
EP
European Patent Office
Prior art keywords
tube
circuit breaker
blast
contacts
spring
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.)
Expired - Lifetime
Application number
EP91105182A
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German (de)
French (fr)
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EP0450567A1 (en
Inventor
Denis Dufournet
Michel Perret
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.)
Alstom Holdings SA
Original Assignee
GEC Alsthom SA
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Filing date
Publication date
Application filed by GEC Alsthom SA filed Critical GEC Alsthom SA
Publication of EP0450567A1 publication Critical patent/EP0450567A1/en
Application granted granted Critical
Publication of EP0450567B1 publication Critical patent/EP0450567B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H33/91—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 the arc-extinguishing fluid being air or gas

Definitions

  • the invention relates to a circuit breaker with end contacts, usable in high or medium voltage electrical circuits.
  • circuit breakers with end contacts of the type comprising a blowing piston
  • a compression of the blowing gas can occur before the separation of the arcing contacts, so as to make the subsequent blowing of the arc more energetic and therefore, more efficient.
  • FIG. 1 is a partial view in axial half-section.
  • the reference 1 designates an operating rod, connected to a tube 2 carrying a blowing piston 3 provided with passages 3A, and a blowing nozzle 4.
  • a blowing volume 5 is defined by the tube 2 and a tube 6 which is attached to it. coaxial and which is integral with a block 7 connected to a first outlet of the circuit breaker, not shown. Sliding contacts 7A provide the electrical connection between the block 7 and the tube 2.
  • Reference 8 designates the fixed arcing contact, of tubular shape, connected to a second circuit breaker socket, not shown.
  • the second arcing contact is a semi-mobile contact pushed by a first end of a spring 10, the second end of which rests on a shoulder of the tube 2.
  • a part of the tubes 9 and 2 are opposite one another; the tube 2 begins its movement when the circuit breaker trips, without causing the contact 9; there is therefore a precompression of volume 5 before the separation of the end contacts which only occurs when the annular ends 2A and 9A of the tubes 2 and 9 come into contact.
  • Contacts 9B ensure the passage of current between the tube 9 and the tube 2.
  • An object of the present invention is to provide a circuit breaker with end arcing contacts having a reduced number of electrical contacts, so as to reduce the cost price and the maintenance cost.
  • the invention aims to propose a simple circuit breaker.
  • the reference 20 designates a porcelain envelope delimiting a sealed enclosure in which is placed a gas with good dielectric properties such as sulfur hexafluoride (SF6), pure or mixed with nitrogen, under a pressure of a few bars.
  • a gas with good dielectric properties such as sulfur hexafluoride (SF6), pure or mixed with nitrogen, under a pressure of a few bars.
  • the envelope 20 is closed at one end by a metal cover 22 carrying a first socket outlet 23.
  • the circuit breaker comprises an arcing contact 24, produced in a tubular form, integral with a fixed block 25 linked to the cover 22 and pierced with a transverse passage 26 to facilitate the circulation of gas in the enclosure 21.
  • the end 27 of the tube 24 is made of a material resistant to the effects of the electric arc, for example an alloy based on tungsten.
  • the mobile assembly of the circuit breaker comprises a metal tube milled so as to comprise a part 31 of small diameter, connected by an articulation 45 to an operating rod 46, and a portion 32 of larger diameter and carrying a blowing nozzle 37 of insulating material.
  • the parts 31 and 32 are connected by a substantially annular part 33 comprising a shoulder 33A, holes 34 and a bead 35 provided with a seal 36.
  • This annular part constitutes a blowing piston.
  • the tubular part 31 defines, with a tube 40 connected to a metal block 42, a blowing volume 41 in which the aforementioned piston can slide.
  • Block 42 is connected to a second socket, not shown, of the circuit breaker.
  • Sliding contacts 43 ensure the passage of current between the tube 31 and the block 42.
  • a layer 43A of an appropriate alloy, for example a silver-based alloy, allows better electrical contact between the tube 31 and the contacts 43.
  • a tube 50 constituting the second arcing contact. It comprises one end 51 of an alloy resistant to the effects of the arc and a bead 52 serving to support a first end of a spring 53, the other end of which rests on the shoulder 33A.
  • the tube 50 When the spring comes to the end of its relaxation, the tube 50 is driven with the movable assembly. An arc 60 springs up between the contacts 27 and 51 (FIG. 3); the current then passes through the socket 23, the cover 22, the block 25, the tube 24-27, the arc 60, the tube 51-50, the tube 31, the layer 43A, the contacts 43, the block 42 and the second take, not shown. The arc is blown by the compressed gas which escapes through the nozzle 37 and goes out at the first zero crossing of the current.
  • the passage 26 in the block 25, as well as a passage 55, in the block 42, allow good circulation of the gas inside the interrupting chamber, which promotes the restoration of the dielectric qualities of the gas after an operation of break.
  • the circuit breaker of the invention comprises only two electrical contacts instead of a minimum of three for circuit breakers of the prior art; consequently, its cost price and its maintenance cost are reduced.
  • the invention applies to the production of medium or high voltage circuit breakers, up to approximately 45 kV.

Landscapes

  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)
  • Push-Button Switches (AREA)
  • Electronic Switches (AREA)
  • Cable Accessories (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

Medium-voltage circuit-breaker with abutting arcing contacts, comprising, in an insulating envelope (20) filled with a gas having good dielectric properties, a first stationary arcing contact (24, 27), connected to a first current intake (23), and a moving rig comprising a first tube (32) which can be displaced by an operating rod (46), the said first tube being connected by gliding contacts to a second current intake, the said first tube defining, with a second stationary tube (40), a blast volume and being prolonged by a blast nozzle, the said circuit-breaker further comprising a second arcing contact (50, 51) characterised in that the first tube is milled so as to comprise a first part (31) of small diameter and cooperating with the said second tube (40) to constitute the said blast volume (41), and a second part (32), of larger diameter, carrying the said blast nozzle (37), the two parts being connected by a substantially annular portion (33) comprising through-holes (34) and a shoulder (33A) and constituting a blast piston, the said second contact consisting of a third tube (50) sliding inside the said first part (31) of the said first tube, the said third tube comprising a flange (52) on which is supported a first end of a spring (53), a second end of which is supported on the said shoulder (33A), the said spring being taut when the circuit-breaker is in the engaged position. <IMAGE>

Description

L'invention concerne un disjoncteur à contacts en bouts, utilisable dans les circuits électriques à haute ou moyenne tension.The invention relates to a circuit breaker with end contacts, usable in high or medium voltage electrical circuits.

Dans les disjoncteurs à contacts en bouts, du type comportant un piston de soufflage, on souhaite que, lors d'une opération de déclenchement, une compression du gaz de soufflage puisse intervenir avant la séparation des contacts d'arc, de manière à rendre le soufflage ultérieur de l'arc plus énergique et donc, plus efficace.In circuit breakers with end contacts, of the type comprising a blowing piston, it is desired that, during a tripping operation, a compression of the blowing gas can occur before the separation of the arcing contacts, so as to make the subsequent blowing of the arc more energetic and therefore, more efficient.

Un disjoncteur de ce type est représenté schématiquement dans la figure 1, qui est une vue partielle en demi-coupe axiale. La référence 1 désigne une tringle de manoeuvre, reliée à un tube 2 portant un piston de soufflage 3 munis de passages 3A, et une buse de soufflage 4. Un volume de soufflage 5 est défini par le tube 2 et un tube 6 qui lui est coaxial et qui est solidaire d'un bloc 7 relié à une première prise de courant du disjoncteur, non représentée. Des contacts glissants 7A assurent la liaison électrique entre le bloc 7 et le tube 2.A circuit breaker of this type is shown diagrammatically in FIG. 1, which is a partial view in axial half-section. The reference 1 designates an operating rod, connected to a tube 2 carrying a blowing piston 3 provided with passages 3A, and a blowing nozzle 4. A blowing volume 5 is defined by the tube 2 and a tube 6 which is attached to it. coaxial and which is integral with a block 7 connected to a first outlet of the circuit breaker, not shown. Sliding contacts 7A provide the electrical connection between the block 7 and the tube 2.

La référence 8 désigne le contact d'arc fixe, de forme tubulaire, relié à une seconde prise de courant du disjoncteur, non représentée.Reference 8 designates the fixed arcing contact, of tubular shape, connected to a second circuit breaker socket, not shown.

Le second contact d'arc, référencé 9, également tubulaire, est un contact semi-mobile poussé par une première extrémité d'un ressort 10 dont la seconde extrémité s'appuie sur un épaulement du tube 2. Lorsque le disjoncteur est en position enclenchée, comme montré dans la figure 1, une partie des tubes 9 et 2 sont en regard l'un de l'autre; le tube 2 commence son mouvement, au déclenchement du disjoncteur, sans entraîner le contact 9; il existe donc une précompression du volume 5 avant la séparation des contacts en bout qui n'intervient que lorsque les extrémités annulaires 2A et 9A des tubes 2 et 9 viennent en contact. Des contacts 9B assurent le passage du courant entre le tube 9 et le tube 2.The second arcing contact, referenced 9, also tubular, is a semi-mobile contact pushed by a first end of a spring 10, the second end of which rests on a shoulder of the tube 2. When the circuit breaker is in the engaged position , as shown in Figure 1, a part of the tubes 9 and 2 are opposite one another; the tube 2 begins its movement when the circuit breaker trips, without causing the contact 9; there is therefore a precompression of volume 5 before the separation of the end contacts which only occurs when the annular ends 2A and 9A of the tubes 2 and 9 come into contact. Contacts 9B ensure the passage of current between the tube 9 and the tube 2.

On voit que ce disjoncteur comporte un grand nombre de contacts électriques. Un but de la présente invention est de réaliser un disjoncteur à contacts d'arc en bout ayant un nombre réduit de contacts électriques, de manière à en réduire le prix de revient et le coût de maintenance.We see that this circuit breaker has a large number of electrical contacts. An object of the present invention is to provide a circuit breaker with end arcing contacts having a reduced number of electrical contacts, so as to reduce the cost price and the maintenance cost.

Un autre disjoncteur, connu par le document EP-A-0 011 542, se distingue du précédent par l'absence des contacts glissants.Another circuit breaker, known from document EP-A-0 011 542, differs from the previous one by the absence of sliding contacts.

Par rapport à cet état de la technique, l'invention a pour but de proposer un disjoncteur simple.Compared to this state of the art, the invention aims to propose a simple circuit breaker.

Selon l'invention, ce but est atteint par le disjoncteur tel que défini par la revendication unique ci-après.According to the invention, this object is achieved by the circuit breaker as defined by the single claim below.

L'invention sera bien comprise par la description donnée ci-après d'un exemple de réalisation de l'invention, en référence au dessin annexé dans lequel:

  • la figure 1 est une vue partielle en demi-coupe axiale d'un disjoncteur selon l'art antérieur,
  • la figure 2 est une vue partielle en demi-coupe axiale d'un disjoncteur selon l'invention, représenté en position enclenchée,
  • la figure 3 est une vue partielle en demi-coupe axiale d'un disjoncteur selon l'invention, représenté en position déclenchée.
The invention will be better understood from the description given below of an embodiment of the invention, with reference to the appended drawing in which:
  • FIG. 1 is a partial view in axial half-section of a circuit breaker according to the prior art,
  • FIG. 2 is a partial view in axial half-section of a circuit breaker according to the invention, shown in the latched position,
  • Figure 3 is a partial view in axial half-section of a circuit breaker according to the invention, shown in the tripped position.

La figure 1, qui concerne l'art antérieur, a déjà été commentée.Figure 1, which relates to the prior art, has already been commented on.

Dans la figure 2, la référence 20 désigne une enveloppe en porcelaine délimitant une enceinte étanche dans laquelle est placé un gaz à bonnes propriétés diélectriques tel que l'hexafluorure de soufre (SF6), pur ou mélangé d'azote, sous une pression de quelques bars.In FIG. 2, the reference 20 designates a porcelain envelope delimiting a sealed enclosure in which is placed a gas with good dielectric properties such as sulfur hexafluoride (SF6), pure or mixed with nitrogen, under a pressure of a few bars.

L'enveloppe 20 est fermée à une extrémité par un couvercle métallique 22 portant une première prise de courant 23.The envelope 20 is closed at one end by a metal cover 22 carrying a first socket outlet 23.

Le disjoncteur comprend un contact d'arc 24, réalisé sous une forme tubulaire, solidaire d'un bloc fixe 25 lié au couvercle 22 et percé d'un passage transversal 26 pour faciliter la circulation du gaz dans l'enceinte 21. L'extrémité 27 du tube 24 est réalisée en un matériau résistant aux effets de l'arc électrique, par exemple en alliage à base de tungstène.The circuit breaker comprises an arcing contact 24, produced in a tubular form, integral with a fixed block 25 linked to the cover 22 and pierced with a transverse passage 26 to facilitate the circulation of gas in the enclosure 21. The end 27 of the tube 24 is made of a material resistant to the effects of the electric arc, for example an alloy based on tungsten.

L'équipage mobile du disjoncteur comprend un tube métallique fraisé de manière à comporter une partie 31 de faible diamètre, relié par une articulation 45 à une tringle de manoeuvre 46, et une portion 32 de plus grand diamètre et portant une buse de soufflage 37 en matériau isolant.The mobile assembly of the circuit breaker comprises a metal tube milled so as to comprise a part 31 of small diameter, connected by an articulation 45 to an operating rod 46, and a portion 32 of larger diameter and carrying a blowing nozzle 37 of insulating material.

Les parties 31 et 32 sont reliées par une partie sensiblement annulaire 33 comprenant un épaulement 33A, des trous 34 et un bourrelet 35 muni d'un joint d'étanchéité 36. Cette partie annulaire constitue un piston de soufflage.The parts 31 and 32 are connected by a substantially annular part 33 comprising a shoulder 33A, holes 34 and a bead 35 provided with a seal 36. This annular part constitutes a blowing piston.

La partie tubulaire 31 définit, avec un tube 40 relié à un bloc métallique 42, un volume de soufflage 41 dans lequel peut coulisser le piston précité. Le bloc 42 est relié à une seconde prise, non représentée, du disjoncteur. Des contacts glissants 43 assurent le passage du courant entre le tube 31 et le bloc 42. Eventuellement, une couche 43A, en alliage approprié, par exemple en alliage à base d'argent, permet un meilleur contact électrique entre le tube 31 et les contacts 43.The tubular part 31 defines, with a tube 40 connected to a metal block 42, a blowing volume 41 in which the aforementioned piston can slide. Block 42 is connected to a second socket, not shown, of the circuit breaker. Sliding contacts 43 ensure the passage of current between the tube 31 and the block 42. Optionally, a layer 43A, of an appropriate alloy, for example a silver-based alloy, allows better electrical contact between the tube 31 and the contacts 43.

Dans le prolongement de la partie tubulaire 31, et à l'intérieur de celle-ci, coulisse un tube 50, constituant le second contact d'arc. Il comprend une extrémité 51 en alliage résistant aux effets de l'arc et un bourrelet 52 servant d'appui à une première extrémité d'un ressort 53 dont l'autre extrémité s'appuie sur l'épaulement 33A.In the extension of the tubular part 31, and inside thereof, slides a tube 50, constituting the second arcing contact. It comprises one end 51 of an alloy resistant to the effects of the arc and a bead 52 serving to support a first end of a spring 53, the other end of which rests on the shoulder 33A.

Le fonctionnement du disjoncteur est le suivant:

  • en position enclenchée, le disjoncteur est dans la configuration de la figure 2; le ressort 53 est comprimé; le courant circule dans la prise 23, le couvercle 22, le bloc 25, le tube 24-27, le tube 51-50, le tube 31, la couche 43A, les contacts 43 le bloc 42 et la seconde prise non représentée.
  • au déclenchement, la tringle de manoeuvre 46 se déplace vers le bas de la figure, entraînant le tube 31. Le tube 50, poussé par le ressort 53 qui se détend progressivement, reste immobile, de sorte que les contacts 27 et 51 restent en contact; pendant cette phase, le gaz du volume 41 est comprimé par le déplacement relatif du piston et du cylindre 40.
The circuit breaker works as follows:
  • in the engaged position, the circuit breaker is in the configuration of FIG. 2; the spring 53 is compressed; the current flows in the socket 23, the cover 22, the block 25, the tube 24-27, the tube 51-50, the tube 31, the layer 43A, the contacts 43 the block 42 and the second socket not shown.
  • when triggered, the operating rod 46 moves downward in the figure, driving the tube 31. The tube 50, pushed by the spring 53 which gradually relaxes, remains stationary, so that the contacts 27 and 51 remain in contact ; during this phase the gas of volume 41 is compressed by the relative displacement of the piston and of cylinder 40.

Lorsque le ressort vient au bout de sa détente, le tube 50 est entraîné avec l'équipage mobile. Un arc 60 jaillit entre les contacts 27 et 51 (figure 3); le courant passe alors par la prise 23, le couvercle 22, le bloc 25, le tube 24-27, l'arc 60, le tube 51-50, le tube 31, la couche 43A, les contacts 43, le bloc 42 et la seconde prise non représentée. L'arc est soufflé par le gaz comprimé qui s'échappe à travers la buse 37 et s'éteint au premier passage par zéro du courant.When the spring comes to the end of its relaxation, the tube 50 is driven with the movable assembly. An arc 60 springs up between the contacts 27 and 51 (FIG. 3); the current then passes through the socket 23, the cover 22, the block 25, the tube 24-27, the arc 60, the tube 51-50, the tube 31, the layer 43A, the contacts 43, the block 42 and the second take, not shown. The arc is blown by the compressed gas which escapes through the nozzle 37 and goes out at the first zero crossing of the current.

Le passage 26 dans le bloc 25, ainsi qu'un passage 55, dans le bloc 42, permettent une bonne circulation du gaz à l'intérieur de la chambre de coupure, ce qui favorise le rétablissement des qualités diélectriques du gaz après une manoeuvre de coupure.The passage 26 in the block 25, as well as a passage 55, in the block 42, allow good circulation of the gas inside the interrupting chamber, which promotes the restoration of the dielectric qualities of the gas after an operation of break.

Le disjoncteur de l'invention comprend seulement deux contacts électriques au lieu de trois au minimum pour les disjoncteurs de l'art antérieur; par suite, son prix de revient et son coût d'entretien sont réduits.The circuit breaker of the invention comprises only two electrical contacts instead of a minimum of three for circuit breakers of the prior art; consequently, its cost price and its maintenance cost are reduced.

L'invention s'applique à la réalisation de disjoncteurs à moyenne ou haute tension, jusqu'à 45 kV environ.The invention applies to the production of medium or high voltage circuit breakers, up to approximately 45 kV.

Claims (1)

  1. A medium tension circuit breaker having end-to-end arcing contacts, the circuit breaker comprising, inside an insulating case (20) filled with a gas having good dielectric properties: a first arcing contact (24) which is fixed and connected to a first circuit breaker terminal; and moving equipment comprising a first tube (31, 32) suitable for being displaced by a drive rod (46) and a second arcing contact, said first tube (31, 32) being connected by sliding contacts to a second circuit breaker terminal, being extended by a blast nozzle (37) and including a small diameter first portion (31) cooperating with a fixed second tube (40) to constitute a blast volume (41), said second contact being constituted by a third tube (50) sliding inside said first portion (31) of said first tube, said third tube (50) having a flange (52) having a first end of the spring (53) bearing thereagainst, said spring being compressed when the circuit breaker is in the engaged position, the circuit breaker also comprising a blast piston co-operating with the first and second tubes to constitute said blast volume (41) and including through holes (34), the blast piston and the first tube forming a unit,
       the circuit breaker being characterized in that the first tube is milled in such a manner as to also comprise a larger diameter second portion (32) carrying said blast nozzle (37), the two portions of the first tube (31, 32) being interconnected by a substantially annular portion (33) including a shoulder (33A) and constituting the blast piston, the second end of said spring (53) bearing against said shoulder (33A).
EP91105182A 1990-04-04 1991-04-02 High- or medium voltage circuit breaker with abutting arcing contacts Expired - Lifetime EP0450567B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9004316A FR2660792B1 (en) 1990-04-04 1990-04-04 HIGH OR MEDIUM VOLTAGE CIRCUIT BREAKER WITH ARC-TO-END CONTACTORS.
FR9004316 1990-04-04

Publications (2)

Publication Number Publication Date
EP0450567A1 EP0450567A1 (en) 1991-10-09
EP0450567B1 true EP0450567B1 (en) 1995-07-26

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ID=9395445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91105182A Expired - Lifetime EP0450567B1 (en) 1990-04-04 1991-04-02 High- or medium voltage circuit breaker with abutting arcing contacts

Country Status (12)

Country Link
US (1) US5155314A (en)
EP (1) EP0450567B1 (en)
JP (1) JP2562086B2 (en)
CN (1) CN1023736C (en)
AT (1) ATE125639T1 (en)
BR (1) BR9101328A (en)
CA (1) CA2039645C (en)
DE (1) DE69111498T2 (en)
DK (1) DK0450567T3 (en)
ES (1) ES2075245T3 (en)
FR (1) FR2660792B1 (en)
GR (1) GR3017630T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06310000A (en) * 1993-04-20 1994-11-04 Hitachi Ltd Grounding switch
CN100414655C (en) * 2006-09-25 2008-08-27 王光顺 Bidirectional energy-storage high-speed disjunction contact for extra-high voltage breaker
US9384924B2 (en) 2012-05-22 2016-07-05 Mitsubishi Electric Corporation Gas circuit breaker
EP3764382A1 (en) * 2016-06-03 2021-01-13 ABB Schweiz AG Gas-insulated low- or medium-voltage load break switch
DE102017222406A1 (en) * 2017-12-11 2019-06-13 Siemens Aktiengesellschaft Vacuum interrupter
CN113161193B (en) * 2020-11-27 2022-08-30 平高集团有限公司 Vacuum circuit breaker and vacuum arc extinguish chamber

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE212352C (en) *
FR2441916A1 (en) * 1978-11-14 1980-06-13 Merlin Gerin SELF-BLOWING ELECTRIC CIRCUIT BREAKER EQUIPPED WITH A DEVICE WITH IMPROVED MAIN CONTACTS
US4327263A (en) * 1980-06-17 1982-04-27 Mitsubishi Denke Kabushiki Kaisha Switching device
DD212352A1 (en) * 1982-12-21 1984-08-08 Liebknecht Transformat SELF-DELETING PRESSURE SWITCH
DE3322597A1 (en) * 1983-05-31 1984-12-06 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau EXHAUST GAS SWITCH
JPS61239529A (en) * 1985-04-15 1986-10-24 東光電気株式会社 Buffer type gas breaker
FR2596575B1 (en) * 1986-03-26 1988-05-20 Alsthom DIELECTRIC GAS CIRCUIT BREAKER UNDER PRESSURE

Also Published As

Publication number Publication date
GR3017630T3 (en) 1996-01-31
JP2562086B2 (en) 1996-12-11
ES2075245T3 (en) 1995-10-01
BR9101328A (en) 1991-11-26
US5155314A (en) 1992-10-13
FR2660792B1 (en) 1992-06-12
DE69111498T2 (en) 1996-01-11
DE69111498D1 (en) 1995-08-31
CN1023736C (en) 1994-02-09
FR2660792A1 (en) 1991-10-11
CA2039645C (en) 1994-11-22
EP0450567A1 (en) 1991-10-09
ATE125639T1 (en) 1995-08-15
DK0450567T3 (en) 1995-10-09
JPH04249821A (en) 1992-09-04
CN1056184A (en) 1991-11-13

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