EP0588709B1 - Circuit breaker with heat shrunk fixed elements - Google Patents

Circuit breaker with heat shrunk fixed elements Download PDF

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Publication number
EP0588709B1
EP0588709B1 EP93402231A EP93402231A EP0588709B1 EP 0588709 B1 EP0588709 B1 EP 0588709B1 EP 93402231 A EP93402231 A EP 93402231A EP 93402231 A EP93402231 A EP 93402231A EP 0588709 B1 EP0588709 B1 EP 0588709B1
Authority
EP
European Patent Office
Prior art keywords
contact
circuit
cylindrical surface
breaker according
support
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
EP93402231A
Other languages
German (de)
French (fr)
Other versions
EP0588709A1 (en
Inventor
André Neveu
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.)
Grid Solutions SAS
Original Assignee
GEC Alsthom T&D SA
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 GEC Alsthom T&D SA filed Critical GEC Alsthom T&D SA
Publication of EP0588709A1 publication Critical patent/EP0588709A1/en
Application granted granted Critical
Publication of EP0588709B1 publication Critical patent/EP0588709B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H33/70—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
    • H01H33/7061—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by use of special mounting means
    • 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 present invention relates to a circuit breaker comprising metallic tubular parts joined to support parts by means of cylindrical surfaces.
  • circuit breaker comprising the constituent elements that are a first and a second permanent contact and a movable arc contact-carrying tube.
  • the object of the invention is to reduce the assembly costs and to increase the reliability of the constituent elements of said circuit breaker.
  • At least one of its tubular constituent elements is fixed by hooping on the cylindrical surface of the corresponding support part, this element being compressed on said surface by a hoop member.
  • This hooping is preferably mechanical, that is to say by cold pressing of the hoop on the part, but can also be thermal, that is to say by fitting after hot expansion.
  • blowing nozzle it is preferably in abutment against one end of a tubular support piece with an annular end flange and in abutment against an endpiece of first permanent contact itself fixed by a ring hoop on the annular flange of the support piece.
  • one end of the contact-carrying tube is fixed by a hoop ring to a support part.
  • the second permanent contact preferably consists of a strip wound on one end of a tubular contact holder and fixed thereon by shrinking a cover also supporting the free edge of the strip .
  • the tip of first permanent contact comprises, at its end fixed to the support part, a radial rib embedded in a radial groove formed thereon.
  • said end of the contact-carrying tube comprises a radial rib embedded in a radial groove formed on the support part.
  • Figure 1 is a longitudinal sectional view of a circuit breaker according to the invention.
  • Figure 2 is a longitudinal sectional view of the attachment of the blowing nozzle according to the invention.
  • Figure 3 is a longitudinal sectional view of the fixing of the movable arcing contact according to the invention.
  • Figure 4 is a longitudinal sectional view of the permanent contact attachment according to the invention.
  • the circuit breaker comprises, in a sealed envelope 15 filled with dielectric gas, a fixed permanent contact 2 said second permanent contact, a fixed arcing contact 16 and a movable element.
  • the latter consists of a first tube 17 carrying at its end a movable arcing contact 18 and integral with a second coaxial tube 5 carrying at its end a blowing nozzle 4 and a movable permanent contact 1 said first permanent contact.
  • a fixed piston 19 is arranged between the first 17 and second 5 tubes and is integral with a contact-carrying tube 3 integral with a fixed support part 9 and on which the tube 5 slides.
  • the blowing nozzle 4 is in abutment against one end of a tubular support piece 5 with an annular end flange 6 made up of the second tube 5 and in abutment against an end piece first permanent contact 1 himself fixed by a hoop ring 7 on the annular flange 6 of the support part 5.
  • the blowing nozzle 4 is therefore mounted centered on an internal shoulder of the support part 5.
  • the contact end piece 1 is also mounted centered on an external shoulder of the annular flange 6 of the support part 5 and comes into abutment on the nozzle 4, in order to keep it in position.
  • the contact end piece 1 has at least one longitudinal slot on its centering diameter, in order to make its part coming into contact with the flange 6 elastic.
  • the hoop ring 7 compresses this assembly and keeps it in place by simple effect of compression.
  • the first permanent contact end piece 1 comprises, at its end fixed on the support part 5, a radial rib 12 embedded in a radial groove formed thereon.
  • the increase in pressure of the internal volume of the nozzle 4 causes a force to tear off the hooped elements.
  • the rib 12 of width slightly less than the corresponding groove of the support part 5 and of thickness for example of about 0.2 mm makes it possible to reinforce the resistance to tearing.
  • one end of the contact-carrying tube 3 is fixed by a hoop ring 8 to the support part 9.
  • said end of the contact-carrying tube 3 comprises a radial rib 13 embedded in a radial groove formed on the support part 9.
  • the assembly is completely identical to that of the first permanent contact 1, with an arrangement of longitudinal slots.
  • the second permanent contact 2 consists of a strip wound on one end of a tubular contact holder 10 and fixed thereon by shrinking a cover 11 also supporting the free edge of the strip .
  • the metal strip forming contact 2 is, near its free edge, deformed inwardly to form a contact protruding part by flexibility and its free edge is retained by the end of the cover 11 which has for this purpose a flange 14 curved inward.
  • This contact 2 does not work in tearing, it is not essential to provide an arrangement of groove and rib, although the latter is obviously easily achievable.

Landscapes

  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Description

La présente invention se rapporte à un disjoncteur comprenant des pièces tubulaires métalliques aboutées à des pièces supports par l'intermédiaire de surfaces cylindriques.The present invention relates to a circuit breaker comprising metallic tubular parts joined to support parts by means of cylindrical surfaces.

Plus précisément il concerne un disjoncteur comprenant les éléments constitutifs que sont un premier et un second contact permanent et un tube porte-contact d'arc mobile.More specifically, it relates to a circuit breaker comprising the constituent elements that are a first and a second permanent contact and a movable arc contact-carrying tube.

Ces éléments constitutifs sont actuellement fixés sur leur pièce support respective par vissage.These components are currently fixed to their respective support piece by screwing.

Le document US-A-3 873 793 décrit un contact d'arc dont l'électrode est fixée sur une partie tubulaire de support par une bague de frette, intercalée entre l'électrode et la partie de support.Document US-A-3 873 793 describes an arcing contact, the electrode of which is fixed to a tubular support part by a hoop ring, interposed between the electrode and the support part.

Le but de l'invention est de réduire les coûts de montage et d'augmenter la fiabilité des éléments constitutifs dudit disjoncteur.The object of the invention is to reduce the assembly costs and to increase the reliability of the constituent elements of said circuit breaker.

Pour ce faire conformément à l'invention, au moins un de ses éléments constitutifs tubulaires est fixé par frettage sur la surface cylindrique de la pièce support correspondante, cet élément étant comprimé sur ladite surface par un organe de frette.To do this in accordance with the invention, at least one of its tubular constituent elements is fixed by hooping on the cylindrical surface of the corresponding support part, this element being compressed on said surface by a hoop member.

Ce frettage est de préférence mécanique, c'est à dire par enfoncement à froid de la frette sur la pièce, mais peut être également thermique, c'est à dire par emmanchement après dilatation à chaud.This hooping is preferably mechanical, that is to say by cold pressing of the hoop on the part, but can also be thermal, that is to say by fitting after hot expansion.

En ce qui concerne la buse de soufflage, elle est, de préférence, en butée contre une extrémité d'une pièce support tubulaire à bride annulaire d'extrémité et en contre butée contre un embout de premier contact permanent lui-même fixé par une bague de frette sur la bride annulaire de la pièce support.As regards the blowing nozzle, it is preferably in abutment against one end of a tubular support piece with an annular end flange and in abutment against an endpiece of first permanent contact itself fixed by a ring hoop on the annular flange of the support piece.

En ce qui concerne le tube porte-contact d'arc mobile, de préférence, une extrémité du tube porte-contact est fixée par une bague de frette à une pièce support.As regards the movable arc contact-carrying tube, preferably one end of the contact-carrying tube is fixed by a hoop ring to a support part.

En ce qui concerne le second contact permanent, il est, de préférence, constitué d'une bande enroulée sur une extrémité d'un porte contact tubulaire et fixée sur celui-ci par frettage d'un capot supportant également le bord libre de la bande.As regards the second permanent contact, it preferably consists of a strip wound on one end of a tubular contact holder and fixed thereon by shrinking a cover also supporting the free edge of the strip .

Avantageusement, l'embout de premier contact permanent comporte, à son extrémité fixée sur la pièce support, une nervure radiale encastrée dans une rainure radiale ménagée sur celle-ci.Advantageously, the tip of first permanent contact comprises, at its end fixed to the support part, a radial rib embedded in a radial groove formed thereon.

De préférence, ladite extrémité du tube porte-contact comporte une nervure radiale encastrée dans une rainure radiale ménagée sur la pièce support.Preferably, said end of the contact-carrying tube comprises a radial rib embedded in a radial groove formed on the support part.

L'invention est exposée ci-après plus en détail à l'aide de dessins ne représentant qu'un mode de réalisation préféré de l'invention.The invention is set out below in more detail with the aid of drawings representing only a preferred embodiment of the invention.

La figure 1 est une vue en coupe longitudinale d'un disjoncteur conforme à l'invention.Figure 1 is a longitudinal sectional view of a circuit breaker according to the invention.

La figure 2 est une vue en coupe longitudinale de la fixation de la buse de soufflage conformément à l'invention.Figure 2 is a longitudinal sectional view of the attachment of the blowing nozzle according to the invention.

La figure 3 est une vue en coupe longitudinale de la fixation du contact d'arc mobile conformément à l'invention.Figure 3 is a longitudinal sectional view of the fixing of the movable arcing contact according to the invention.

La figure 4 est une vue en coupe longitudinale de la fixation de contact permanent conformément à l'invention.Figure 4 is a longitudinal sectional view of the permanent contact attachment according to the invention.

Selon l'exemple représenté sur la figure 1, le disjoncteur comprend, dans une enveloppe étanche 15 rempli de gaz diélectrique, un contact permanent fixe 2 dit second contact permanent, un contact d'arc fixe 16 et un équipage mobile. Ce dernier se compose d'un premier tube 17 portant à son extrémité un contact d'arc mobile 18 et solidaire d'un second tube 5 coaxial portant à son extrémité une buse de soufflage 4 et un contact permanent mobile 1 dit premier contact permanent. Un piston fixe 19 est disposé entre les premier 17 et deuxième 5 tubes et est solidaire d'un tube porte contact 3 solidaire d'une pièce support 9 fixe et sur lequel coulisse le tube 5.According to the example shown in Figure 1, the circuit breaker comprises, in a sealed envelope 15 filled with dielectric gas, a fixed permanent contact 2 said second permanent contact, a fixed arcing contact 16 and a movable element. The latter consists of a first tube 17 carrying at its end a movable arcing contact 18 and integral with a second coaxial tube 5 carrying at its end a blowing nozzle 4 and a movable permanent contact 1 said first permanent contact. A fixed piston 19 is arranged between the first 17 and second 5 tubes and is integral with a contact-carrying tube 3 integral with a fixed support part 9 and on which the tube 5 slides.

Comme représenté sur la figure 2, à plus grande échelle, la buse de soufflage 4 est en butée contre une extrémité d'une pièce support 5 tubulaire à bride annulaire d'extrémité 6 constituée du second tube 5 et en contre butée contre un embout de premier contact permanent 1 lui-même fixé par une bague de frette 7 sur la bride annulaire 6 de la pièce support 5.As shown in FIG. 2, on a larger scale, the blowing nozzle 4 is in abutment against one end of a tubular support piece 5 with an annular end flange 6 made up of the second tube 5 and in abutment against an end piece first permanent contact 1 himself fixed by a hoop ring 7 on the annular flange 6 of the support part 5.

La buse de soufflage 4 est donc montée centrée sur un épaulement intérieur de la pièce support 5. L'embout de contact 1 est également monté centré sur un épaulement extérieur de la bride annulaire 6 de la pièce support 5 et vient en contre butée sur la buse 4, afin de la maintenir en position. L'embout de contact 1 comporte au moins une fente longitudinale sur son diamètre de centrage, afin de rendre élastique sa partie venant en contact avec la bride 6. La bague de frette 7 vient comprimer cet ensemble et le maintient en place par simple effet de compression.The blowing nozzle 4 is therefore mounted centered on an internal shoulder of the support part 5. The contact end piece 1 is also mounted centered on an external shoulder of the annular flange 6 of the support part 5 and comes into abutment on the nozzle 4, in order to keep it in position. The contact end piece 1 has at least one longitudinal slot on its centering diameter, in order to make its part coming into contact with the flange 6 elastic. The hoop ring 7 compresses this assembly and keeps it in place by simple effect of compression.

Afin d'améliorer cette fixation, l'embout de premier contact permanent 1 comporte, à son extrémité fixée sur la pièce support 5, une nervure radiale 12 encastrée dans une rainure radiale ménagée sur celle-ci.In order to improve this fixing, the first permanent contact end piece 1 comprises, at its end fixed on the support part 5, a radial rib 12 embedded in a radial groove formed thereon.

En effet, lors de la coupure, la montée en pression du volume intérieur de la buse 4 entraîne un effort à l'arrachement des éléments frettés. La nervure 12 de largeur légèrement inférieure à la rainure correspondante de la pièce support 5 et d'épaisseur par exemple d'environ 0,2 mm permet de renforcer la tenue à l'arrachement.In fact, during the cut-off, the increase in pressure of the internal volume of the nozzle 4 causes a force to tear off the hooped elements. The rib 12 of width slightly less than the corresponding groove of the support part 5 and of thickness for example of about 0.2 mm makes it possible to reinforce the resistance to tearing.

Afin de faciliter la mise en place de l'embout 1, il est réalisé par exemple huit fentes longitudinales réparties sur la collerette de centrage, afin de rendre celle-ci plus déformable et permettre à la fois l'encastrement des tronçons de nervures 12 dans la rainure correspondante et la compression de la bague de frette. Un tel agencement de rainure et nervure permet d'augmenter jusqu'à six fois la tenue à l'arrachement de l'assemblage.In order to facilitate the installation of the end piece 1, it is produced for example eight longitudinal slots distributed on the centering collar, in order to make the latter more deformable and allow both the embedding of the sections of ribs 12 in the corresponding groove and the compression of the hoop ring. Such an arrangement of groove and rib makes it possible to increase the pull-out strength of the assembly up to six times.

Comme représenté sur la figure 3, une extrémité du tube porte contact 3 est fixée par une bague de frette 8 à la pièce support 9.As shown in FIG. 3, one end of the contact-carrying tube 3 is fixed by a hoop ring 8 to the support part 9.

De préférence, ladite extrémité du tube porte contact 3 comporte une nervure radiale 13 encastrée dans une rainure radiale ménagée sur la pièce support 9.Preferably, said end of the contact-carrying tube 3 comprises a radial rib 13 embedded in a radial groove formed on the support part 9.

Le montage est totalement identique à celui du premier contact permanent 1, avec un agencement de fentes longitudinales.The assembly is completely identical to that of the first permanent contact 1, with an arrangement of longitudinal slots.

Comme représenté sur la figure 4, le second contact permanent 2 est constitué d'une bande enroulée sur une extrémité d'un porte contact tubulaire 10 et fixée sur celui-ci par frettage d'un capot 11 supportant également le bord libre de la bande.As shown in Figure 4, the second permanent contact 2 consists of a strip wound on one end of a tubular contact holder 10 and fixed thereon by shrinking a cover 11 also supporting the free edge of the strip .

La bande métallique formant contact 2 est, à proximité de son bord libre, déformée vers l'intérieur pour former une partie saillante de contact par flexibilité et son bord libre est retenu par l'extrémité du capot 11 qui présente pour ce faire un rebord 14 courbé vers l'intérieur. Ce contact 2 ne travaillant pas à l'arrachement, il n'est pas indispensable de prévoir un agencement de rainure et nervure, bien que ce dernier soit bien évidemment facilement réalisable.The metal strip forming contact 2 is, near its free edge, deformed inwardly to form a contact protruding part by flexibility and its free edge is retained by the end of the cover 11 which has for this purpose a flange 14 curved inward. This contact 2 does not work in tearing, it is not essential to provide an arrangement of groove and rib, although the latter is obviously easily achievable.

Claims (9)

  1. Circuit-breaker comprising a first permanent contact (1), a second permanent contact (2) and a mobile arc contact support tube (3) consisting of tubular metal components abutted to support members by means of cylindrical surfaces, characterised in that at least one of its components is a force-fit on the cylindrical surface of the respective support member, this component being compressed onto said surface by a clamping member.
  2. Circuit-breaker according to claim 1 comprising a permanent contact (1) and a blow-out nozzle (4) consisting of tubular members each abutted to a common support member (5) by means of cylindrical surfaces, characterised in that the blow-nozzle (4) is abutted at one end against one end of the tubular support member (5) with an annular end flange (6) and at the opposite end against a first permanent contact end-piece (1) compressed by a clamping ring (7) onto a cylindrical surface of the annular flange (6) of the support member (5).
  3. Circuit-breaker according to claim 2 characterised in that said cylindrical surface of the annular flange (6) incorporates a radial groove.
  4. Circuit-breaker according to claim 3 characterised in that the first permanent contact end-piece (1) has at the end fixed to the support member (5) a radial rib (12) engaged in said radial groove.
  5. Circuit-breaker according to claim 1 comprising a mobile arc contact support tube (3) consisting of a tubular metal member abutted to a support member (9) by means of a cylindrical surface, characterised in that one end of the mobile contact support tube (3) is compressed by a clamping ring (8) onto a cylindrical surface of the support member (9) and in that said cylindrical surface incorporates a radial groove.
  6. Circuit-breaker according to claim 5 characterised in that said end of the contact support tube (3) incorporates a radial rib (13) engaged in said radial groove.
  7. Circuit-breaker according to claim 1 comprising a permanent contact (2) consisting of a tubular metal member abutted to a contact support (10) by means of a cylindrical surface, characterised in that the permanent contact (2) comprises a strip wound onto a cylindrical surface at one end of the tubular contact support (10) and compressed onto the latter by a force-fitted cap (11) also supporting the free edge of the strip.
  8. Circuit-breaker according to claim 7 characterised in that said cylindrical surface of the contact support (10) incorporates a radial groove.
  9. Circuit-breaker according to claim 8 characterised in that the strip has at the end fixed to the contact support (10) a radial rib engaged in said radial groove.
EP93402231A 1992-09-18 1993-09-14 Circuit breaker with heat shrunk fixed elements Expired - Lifetime EP0588709B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9211157A FR2696041B1 (en) 1992-09-18 1992-09-18 Circuit breaker with elements fixed by hooping.
FR9211157 1992-09-18

Publications (2)

Publication Number Publication Date
EP0588709A1 EP0588709A1 (en) 1994-03-23
EP0588709B1 true EP0588709B1 (en) 1996-12-18

Family

ID=9433658

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402231A Expired - Lifetime EP0588709B1 (en) 1992-09-18 1993-09-14 Circuit breaker with heat shrunk fixed elements

Country Status (6)

Country Link
US (1) US5424503A (en)
EP (1) EP0588709B1 (en)
JP (1) JP2848767B2 (en)
DE (1) DE69306707T2 (en)
ES (1) ES2095602T3 (en)
FR (1) FR2696041B1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6128168A (en) 1998-01-14 2000-10-03 General Electric Company Circuit breaker with improved arc interruption function
US6144540A (en) * 1999-03-09 2000-11-07 General Electric Company Current suppressing circuit breaker unit for inductive motor protection
US6157286A (en) * 1999-04-05 2000-12-05 General Electric Company High voltage current limiting device
EP1686602B2 (en) * 2005-02-01 2021-04-07 ABB Power Grids Switzerland AG Blast nozzle mounting means for electrical circuit breaker
FR2960092B1 (en) 2010-05-11 2013-06-28 Areva T & D Ag ATTACHING A MEDIUM OR HIGH VOLTAGE ELECTRICAL APPARATUS TO A BASE BY FORCE-CONNECTION
FR3043266A1 (en) * 2015-11-02 2017-05-05 Ircamex DEVICE FOR CONTAINING A LEAKAGE OF A GAS CONTAINED IN A DUCT
KR101968228B1 (en) 2017-12-28 2019-04-11 효성중공업 주식회사 Circuit Breaker of moving conductor in a gas insulation switchgear
DE102020211514B4 (en) * 2020-09-14 2024-02-01 Siemens Energy Global GmbH & Co. KG High voltage circuit breaker with shrink connection and method of manufacturing the high voltage circuit breaker

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DE2232314C3 (en) * 1972-06-27 1979-05-10 Siemens Ag, 1000 Berlin Und 8000 Muenchen Contact system for electrical high-voltage devices with a gaseous insulating medium, in particular high-voltage circuit breakers
JPS54144986A (en) * 1978-05-04 1979-11-12 Hitachi Ltd Buffer type gas breaker
NO149046C (en) * 1981-09-21 1984-02-01 Hafstad Bjorn Enclosed luminaire luminaire with base and holder for lamps or light bulbs.
JPS5940424A (en) * 1982-08-27 1984-03-06 株式会社東芝 Buffer type gas breaker
JPS60211186A (en) * 1984-04-04 1985-10-23 動力炉・核燃料開発事業団 Pipe joint for remote control
FR2576144B1 (en) * 1985-01-16 1987-02-06 Alsthom Atlantique HIGH VOLTAGE, COMPRESSED GAS, LOW-ENERGY CIRCUIT BREAKER
JPS61171021A (en) * 1985-01-25 1986-08-01 株式会社日立製作所 Gas blowoff breaker
JPS6230087U (en) * 1985-08-08 1987-02-23
JPS62208367A (en) * 1986-03-03 1987-09-12 カルル、シエム Thermoplastic clamp ring
JP2506636Y2 (en) * 1987-01-17 1996-08-14 三菱電機株式会社 Switch arc extinguishing device
JPH01172241U (en) * 1988-05-26 1989-12-06
FR2647255B1 (en) * 1989-05-17 1993-04-23 Alsthom Gec HIGH VOLTAGE CIRCUIT BREAKER WITH BLOWING DIELECTRIC GAS
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JP2771305B2 (en) * 1990-03-13 1998-07-02 株式会社日立製作所 Gas circuit breaker
JPH04284319A (en) * 1991-03-13 1992-10-08 Hitachi Ltd Gas-blast circuit breaker

Also Published As

Publication number Publication date
DE69306707T2 (en) 1997-04-30
DE69306707D1 (en) 1997-01-30
JP2848767B2 (en) 1999-01-20
EP0588709A1 (en) 1994-03-23
FR2696041B1 (en) 1994-10-14
JPH06196052A (en) 1994-07-15
US5424503A (en) 1995-06-13
ES2095602T3 (en) 1997-02-16
FR2696041A1 (en) 1994-03-25

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