EP0141329B1 - Compressed-gas circuit breaker - Google Patents

Compressed-gas circuit breaker Download PDF

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Publication number
EP0141329B1
EP0141329B1 EP84112381A EP84112381A EP0141329B1 EP 0141329 B1 EP0141329 B1 EP 0141329B1 EP 84112381 A EP84112381 A EP 84112381A EP 84112381 A EP84112381 A EP 84112381A EP 0141329 B1 EP0141329 B1 EP 0141329B1
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EP
European Patent Office
Prior art keywords
contact
stationary contact
compressed
sleeve
circuit breaker
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Expired
Application number
EP84112381A
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German (de)
French (fr)
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EP0141329A1 (en
Inventor
Sten Dipl.-Ing. Berneryd
Ralf Dipl.-Ing. Hartings
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ABB Norden Holding AB
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ASEA AB
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Publication of EP0141329A1 publication Critical patent/EP0141329A1/en
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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
    • 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

Definitions

  • the present invention relates to a gas pressure switch according to the preamble of claim 1. It is a blow piston switch. SF 6 is preferably used as the gas.
  • the cylindrical sleeve which guides or controls the gas flow during the switch-off process, completely surrounds the fixed switching contact, both in the switched-on state and during the switch-off process.
  • Such a switch is primarily intended for the so-called medium voltage range, ie for the range from 6 to 36 kV. In principle, however, it can also be used for higher voltages.
  • Such a switch is already known from DE-B-1 207 473, in which the entire fixed switching contact is arranged exposed to the arc, so that there is a risk that the base of the arc will remain on the end face of the fixed switching contact if the blowing of the arc is insufficient.
  • the device provided for controlling the gas flow through the switching point during the switching-off process consists of a complicatedly shaped sleeve which is carried by the fixed or movable switching contact.
  • this switch is relatively complicated since, in addition to the nozzle-shaped movable wall mentioned above and the movable arrangement of the sleeve mentioned, a further wall moved with the movable contact is required which surrounds the fixed switching contact during the initial switching process and which is present on the fixed switching contact , supported under spring pressure sleeve.
  • the switch according to FIGS. 1 and 2 is provided with main contacts which carry the operating current but have no switching function, and with switching contacts with which the actual switching operation is carried out.
  • the invention relates essentially to the configuration of the switch contact arrangement, which can also be used for a switch without separate operating current contacts.
  • the switch according to FIGS. 1 and 2 has an essentially cylindrical housing 22 with an upper and a lower cover 24, 23.
  • the housing is filled with SF 6 gas, which is under an overpressure of, for example, 0.2 MPa.
  • a contact flange 3, 4 is connected to each connecting rail, the latter via an angle piece 5.
  • a fixed main contact 6 or 7 is attached to each flange, which consists of a conductive cylinder which is slit lengthways to form contact fingers.
  • These fixed main contacts are connected to a movable main contact in the form of a conductive cylinder 8, which is fastened to a contact rod 10 by means of a conductive flange 9.
  • the contact rod is axially movable and is mounted in a fixed sleeve 14.
  • the contact rod is connected to a connecting rod 11 made of insulating material, which is connected to a crank arm 12 on a shaft 13.
  • a connecting rod 11 made of insulating material, which is connected to a crank arm 12 on a shaft 13.
  • the switching point is arranged between the flanges 3 and 9.
  • This consists of a fixed switch contact 18 and a movable switch contact 17.
  • the fixed switch contact 18 consists of a conductive cylinder which is fixed to the flange 3, concentrically in front of a hole 21 in this flange.
  • the cylindrical switch contact 18 is slotted several times in the longitudinal direction, so that it forms contact fingers which encompass the movable switch contact 17, which is designed as a head on the contact rod.
  • a flange 15 which is dimensioned such that it fits as a piston into the cylinder 8, so that the cylinder and the piston together form a pump.
  • an insulating sleeve 19 is attached to the top of the flange 9 such that it surrounds the holes 16 and the fixed switching contact.
  • This sleeve has a cylindrical shape with straight walls.
  • a ring 20 is arranged, which produces a seal between the fixed switching contact 18 and the sleeve 19.
  • This ring covers the end face of the fixed switch contact 18 with an edge in order to prevent the arc from burning at this end face and to direct the base point of the arc into the interior of the fixed switch contact 18 instead. This ensures that the gas flow from the holes 16 flows upward around the switch contact 17 and into the switch contact 18.
  • this sleeve 30 can consist of a conductive material, for example copper.
  • the latter In order to prevent the gas flow from being reflected from the sides of the housing towards the switching point, the latter is surrounded by an upper insulating wall 26 which projects downward beyond the switching point.
  • a similar insulating wall 27 is arranged in the lower part of the housing in order to protect the main contact 7 against the hot gases.
  • the invention can also be applied to switches with extinguishing gas blowing through both the fixed and the movable switching contact.

Description

Die vorliegende Erfindung betrifft einen Druckgasschalter gemäß dem Oberbegriff des Anspruches 1. Es handelt sich hierbei um einen Blaskolbenschalter. Als Gas wird vorzugsweise SF6 verwendet. Die zylindrische Hülse, welche den Gasstrom während des Ausschaltvorganges führt bzw. steuert, umgibt den festen Schaltkontakt vollständig, und zwar sowohl im eingeschalteten Zustand als auch während des Ausschaltvorganges. Ein solcher Schalter ist in erster Linie für den sogenannten Mittelspannungsbereich bestimmt, d. h. für den Bereich von 6 bis 36 kV. Er kann grundsätzlich jedoch auch für höhere Spannungen eingesetzt werden.The present invention relates to a gas pressure switch according to the preamble of claim 1. It is a blow piston switch. SF 6 is preferably used as the gas. The cylindrical sleeve, which guides or controls the gas flow during the switch-off process, completely surrounds the fixed switching contact, both in the switched-on state and during the switch-off process. Such a switch is primarily intended for the so-called medium voltage range, ie for the range from 6 to 36 kV. In principle, however, it can also be used for higher voltages.

Aus der DE-B-1 207 473 ist bereits ein derartiger Schalter bekannt, bei welchem der gesamte feste Schaltkontakt gegenüber dem Lichtbogen exponiert angeordnet ist, so daß die Gefahr besteht, daß der eine Fußpunkt des Lichtbogens an der Endfläche des festen Schaltkontaktes stehenbleibt, wenn die Beblasung des Lichtbogens unzureichend ist. Bei einem anderen, aus der DE-A-1 815 723 bekannten Druckgasschalter mit Blaskolben besteht die zur Steuerung des Gasstromes durch die Schaltstelle beim Ausschaltvorgang vorgesehene Vorrichtung aus einer kompliziert geformten Hülse, die von dem festen oder beweglichen Schaltkontakt getragen wird.Such a switch is already known from DE-B-1 207 473, in which the entire fixed switching contact is arranged exposed to the arc, so that there is a risk that the base of the arc will remain on the end face of the fixed switching contact if the blowing of the arc is insufficient. In another, known from DE-A-1 815 723 pressure gas switch with a blowing piston, the device provided for controlling the gas flow through the switching point during the switching-off process consists of a complicatedly shaped sleeve which is carried by the fixed or movable switching contact.

Aus der US-A-4 112 276 ist ein Druckgasschalter bekannt, bei dem der feste Schaltkontakt eine unter Federspannung stehende, verschiebbare Hülse trägt, die mit einer den festen Schaltkontakt umgebenden Düsenwand den Raum umgibt, in dem Druckgas bei der Öffnungsbewegung des Schalters komprimiert wird. Sobald jedoch der Lichtbogen eine Länge erreicht hat, die ein Beblasen zum Zwecke der Löschung sinnvoll erscheinen läßt, wird der Verschluß dieses Raumes durch Blockierung der Gleitbewegung der verschiebbaren Hülse aufgehoben, so daß die Löschströmung einsetzt, die sich von der Seite des beweglichen Kontaktes kommend um den Lichtbogen herum erstreckt und an der Außenseite des hohlen feststehenden Kontaktes entlang abströmt. Der Lichtbogen steht dabei zwischen der Stirnseite des festen Kontaktes und dem beweglichen Kontakt. Der Aufbau dieses Schalters ist relativ kompliziert, da neben der genannten düsenförmig geformten beweglichen Wand und der beweglichen Anordnung der genannten Hülse eine weitere mit dem beweglichen Kontakt bewegte Wand erforderlich ist, die während des anfänglichen Schaltvorganges den festen Schaltkontakt umgibt und die auf dem festen Schaltkontakt vorhandenen, unter Federdruck stehenden Hülse abstützt.From US-A-4 112 276 a compressed gas switch is known in which the fixed switch contact carries a spring-loaded, displaceable sleeve which surrounds the space with a nozzle wall surrounding the fixed switch contact, in which compressed gas is compressed during the opening movement of the switch . However, as soon as the arc has reached a length which makes blowing for the purpose of extinguishing seem reasonable, the closure of this space is released by blocking the sliding movement of the displaceable sleeve, so that the extinguishing flow begins, which comes from the side of the moving contact extends the arc around and flows along the outside of the hollow fixed contact. The arc is between the face of the fixed contact and the movable contact. The construction of this switch is relatively complicated since, in addition to the nozzle-shaped movable wall mentioned above and the movable arrangement of the sleeve mentioned, a further wall moved with the movable contact is required which surrounds the fixed switching contact during the initial switching process and which is present on the fixed switching contact , supported under spring pressure sleeve.

Aus der US-A-3 852 551 ist ein Druckgasschalter bekannt, bei dem ebenfalls beim Ausschaltvorgang in einem Zylinder eine Komprimierung von Gas zwecks Kühlung des Lichtbogens stattfindet. Der Lichtbogen wird in einer in ihren Abmessungen unverändert bleibenden Kammer gezogen, die mit der Umgebung des festen Schaltkontakts in ständiger Verbindung steht. Das in diese Kammer einströmende komprimierende Kühlgas durchströmt den feststehenden und den beweglichen Kontakt. Am freien Ende des feststehenden Kontaktes ist ein scheibenförmiger Isolierring angebracht.From US-A-3 852 551 a gas pressure switch is known, in which a compression of gas also takes place in a cylinder during the switching-off process in order to cool the arc. The arc is drawn in a chamber which remains unchanged in its dimensions and which is in constant communication with the surroundings of the fixed switching contact. The compressing cooling gas flowing into this chamber flows through the fixed and the movable contact. A disc-shaped insulating ring is attached to the free end of the fixed contact.

Der Erfindung liegt die Aufgabe zugrunde, einen Druckgasschalter der eingangs genannten Art zu entwickeln, dessen Aufbau einfacher und billiger als der der bekannten Druckgasschalter ist und der bessere Schalteigenschaften als die bekannten Druckgasschalter hat.The invention has for its object to develop a gas pressure switch of the type mentioned, the structure of which is simpler and cheaper than that of the known gas pressure switch and which has better switching properties than the known gas pressure switch.

Zur Lösung dieser Aufgabe sin bei einem Druckgasschalter gemäß dem Oberbegriff des Anspruches 1 erfindungsgemäß die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale vorgesehen.To achieve this object, the features mentioned in the characterizing part of claim 1 are provided according to the invention in a compressed gas switch according to the preamble of claim 1.

Vorteilhafte Ausgestaltungen der Erfindung sind in den weiteren Ansprüchen genannt.Advantageous embodiments of the invention are mentioned in the further claims.

Dadurch, daß man das freie Ende des festen Schaltkontaktes mit einem Ring versieht, der zwischen dem festen Schaltkontakt und der Hülse auf dem beweglichen Schaltkontakt abdichtet, vermeidet man einen Leckstrom des Gases, so daß der gesamte Gasstrom in den festen Schaltkontakt hineingeleitet wird. Um zu vermeiden, daß der Lichtbogen an der Endfläche des festen Schaltkontaktes brennt und um zu erreichen, daß er stattdessen in die Öffnung des festen Kontaktes hineingeleitet wird, wo sein Fußpunkt effektiver gekühlt wird, reicht eine Kante des Ringes über die Endfläche des festen Schaltkontaktes. Ferner kann man in dem festen Schaltkontakt eine dichte Hülse anbringen, um ein Herausströmen von heißem Gas durch die Seiten des festen Schaltkontaktes, der normalerweise zur Bildung von Kontaktfingern mit Längsschlitzen versehen ist, zu verhindern.By providing the free end of the fixed switching contact with a ring which seals between the fixed switching contact and the sleeve on the movable switching contact, a leakage current of the gas is avoided, so that the entire gas flow is conducted into the fixed switching contact. To prevent the arc from burning on the end face of the fixed switch contact and to ensure that it is instead directed into the opening of the fixed contact where its base is cooled more effectively, one edge of the ring extends over the end face of the fixed switch contact. Furthermore, a tight sleeve can be fitted in the fixed switching contact in order to prevent hot gas from flowing out through the sides of the fixed switching contact, which is normally provided with longitudinal slots to form contact fingers.

Anhand des in den Figuren gezeigten Ausführungsbeispiels soll die Erfindung näher erläutert werden. Es zeigen

  • Figur 1 ein Ausführungsbeispiel eines Druckgasschalters gemäß der Erfindung im eingeschalteten Zustand,
  • Figur 2 den Schalter gemäß Figur 1 in Ausschaltstellung,
  • Figur 3 ein Detail des Druckgasschalters gemäß den Figuren 1 und 2 in vergrößertem Maßstab.
The invention will be explained in more detail with reference to the exemplary embodiment shown in the figures. Show it
  • 1 shows an exemplary embodiment of a compressed gas switch according to the invention in the switched-on state,
  • FIG. 2 shows the switch according to FIG. 1 in the off position,
  • Figure 3 shows a detail of the gas pressure switch according to Figures 1 and 2 on an enlarged scale.

Der Schalter nach den Figuren 1 und 2 ist mit Hauptkontakten, welche den Betriebsstrom führen, aber keine Schaltfunktion haben, und mit Schaltkontakten versehen, mit welchen der eigentliche Schaltvorgang ausgeführt wird. Die Erfindung betrifft im wesentlichen die Ausgestaltung der Schaltkontaktanordnung, welche auch för einen Schalter ohne separate Betriebsstromkontakte verwendet werden kann.The switch according to FIGS. 1 and 2 is provided with main contacts which carry the operating current but have no switching function, and with switching contacts with which the actual switching operation is carried out. The invention relates essentially to the configuration of the switch contact arrangement, which can also be used for a switch without separate operating current contacts.

Der Schalter nach den Figuren 1 und 2 hat ein im wesentlichen zylindrisches Gehäuse 22 mit einem oberen und einem unteren Deckel 24, 23. Das Gehäuse ist mit SF6-Gas gefüllt, welches unter einem Überdruck von beispielsweise 0,2 MPa steht. An jede Anschlußschiene ist ein Kontaktflansch 3, 4 angeschlossen, der letztgenannte über ein Winkelstück 5. An jedem Flansch ist ein fester Hauptkontakt 6 bzw. 7 befestigt, der aus einem leitenden Zylinder besteht, welcher der Länge nach zur Bildung von Kontaktfingern aufgeschlitzt ist. Diese festen Hauptkontakte werden mit einem beweglichen Hauptkontakt in Form eines leitenden Zylinders 8 verbunden, der mittels eines leitenden Flansches 9 an einem Kontaktstab 10 befestigt ist. Der Kontaktstab ist axial beweglich und in einer festen Hülse 14 gelagert. An seinem unteren Ende ist der Kontaktstab mit einer Pleuelstange 11 aus Isoliermaterial verbunden, die an einen Kurbelarm 12 auf einer Welle 13 angeschlossen ist. Durch Drehen der Welle 13 kann man somit den Kontaktstab 10 nach oben und unten führen und auf diese Weise den Schalter ein- und ausschalten.The switch according to FIGS. 1 and 2 has an essentially cylindrical housing 22 with an upper and a lower cover 24, 23. The housing is filled with SF 6 gas, which is under an overpressure of, for example, 0.2 MPa. A contact flange 3, 4 is connected to each connecting rail, the latter via an angle piece 5. A fixed main contact 6 or 7 is attached to each flange, which consists of a conductive cylinder which is slit lengthways to form contact fingers. These fixed main contacts are connected to a movable main contact in the form of a conductive cylinder 8, which is fastened to a contact rod 10 by means of a conductive flange 9. The contact rod is axially movable and is mounted in a fixed sleeve 14. At its lower end, the contact rod is connected to a connecting rod 11 made of insulating material, which is connected to a crank arm 12 on a shaft 13. By rotating the shaft 13, the contact rod 10 can thus be moved up and down and the switch can be switched on and off in this way.

Zwischen den Flanschen 3 und 9 ist die Schaltstelle angeordnet. Diese besteht aus einem festen Schaltkontakt 18 und einem beweglichen Schaltkontakt 17. Der feste Schaltkontakt 18 besteht aus einem leitfähigen Zylinder, der an dem Flansch 3 befestigt ist, und zwar konzentrisch vor einem Loch 21 in diesem Flansch. Der zylindrische Schaltkontakt 18 ist in Längsrichtung mehrfach geschlitzt, so daß er Kontaktfinger bildet, die den beweglichen Schaltkontakt 17 umgreifen, der als Kopf auf dem Kontaktstab ausgebildet ist.The switching point is arranged between the flanges 3 and 9. This consists of a fixed switch contact 18 and a movable switch contact 17. The fixed switch contact 18 consists of a conductive cylinder which is fixed to the flange 3, concentrically in front of a hole 21 in this flange. The cylindrical switch contact 18 is slotted several times in the longitudinal direction, so that it forms contact fingers which encompass the movable switch contact 17, which is designed as a head on the contact rod.

An dem oberen Ende der Hülse 14, welche den Kontaktstab 10 führt, ist ein Flansch 15 vorhanden, der so bemessen ist, daß er als Kolben in den Zylinder 8 hineinpaßt, so daß der Zylinder und der Kolben zusammen eine Pumpe bilden.At the upper end of the sleeve 14, which guides the contact rod 10, there is a flange 15 which is dimensioned such that it fits as a piston into the cylinder 8, so that the cylinder and the piston together form a pump.

Beim Ausschalten des Schalters werden die beweglichen Teile 8, 9,10,17 des Schalters von der Pleuelstange 11 nach unten gezogen, wobei zunächst die Hauptkontaktstelle geöffnet wird, da der Zylinder 8 und der Flansch 9 aus dem festen Hauptkontakt 6 herausgleiten. Dabei kommutiert der Strom zu den Schaltkontakten 17, 18, die erst im weiteren Verlauf der Bewegung geöffnet werden. Gleichzeitig wird das Gas im Zylinder 8 komprimmiert und strömt mit großer Geschwindigkeit nach oben durch die Löcher 16 im Flansch 9, am beweglichen Schaltkontakt 17 entlang, durch den festen Schaltkontakt 18 und durch das Loch 21 im Flansch 3.When the switch is switched off, the movable parts 8, 9, 10, 17 of the switch are pulled down by the connecting rod 11, the main contact point being opened first because the cylinder 8 and the flange 9 slide out of the fixed main contact 6. The current commutates to the switching contacts 17, 18, which are only opened in the further course of the movement. At the same time, the gas in the cylinder 8 is compressed and flows upwards at high speed through the holes 16 in the flange 9, along the movable switch contact 17, through the fixed switch contact 18 and through the hole 21 in the flange 3.

Um diesen Gasstrom zu führen, ist auf der Oberseite des Flansches 9 eine isolierende Hülse 19 derart angebracht, daß sie die Löcher 16 und den festen Schaltkontakt umgibt. Diese Hülse hat eine zylindrische Form mit geraden Wänden. An dem unteren Ende des festen Schaltkontaktes 18 ist ein Ring 20 angeordnet, welcher eine Dichtung zwischen dem festen Schaltkontakt 18 und der Hülse 19 herstellt. Dieser Ring überdeckt mit einer Kante die Endfläche des festen Schaltkontaktes 18, um zu verhindern, daß der Lichtbogen an dieser Endfläche brennt, und um den Fußpunkt des Lichtbogens stattdessen in das Innere des festen Schaltkontaktes 18 hineinzulenken. Auf diese Weise wird sichergestellt, daß der Gasstrom von den Löchern 16 nach oben um den Schaltkontakt 17 herum und in den Schaltkontakt 18 hineinströmt. Um zu vermeiden, daß das heiße Gas durch die Schlitze des Schaltkontaktes 18 herausströmt, kann dieser auf der Innenseite mit einer Hülse 30 versehen werden, wie es in Figur 3 gezeigt ist. Diese Hülse kann aus einem leitenden Material, beispielsweise Kupfer, bestehen.In order to conduct this gas flow, an insulating sleeve 19 is attached to the top of the flange 9 such that it surrounds the holes 16 and the fixed switching contact. This sleeve has a cylindrical shape with straight walls. At the lower end of the fixed switching contact 18, a ring 20 is arranged, which produces a seal between the fixed switching contact 18 and the sleeve 19. This ring covers the end face of the fixed switch contact 18 with an edge in order to prevent the arc from burning at this end face and to direct the base point of the arc into the interior of the fixed switch contact 18 instead. This ensures that the gas flow from the holes 16 flows upward around the switch contact 17 and into the switch contact 18. In order to avoid that the hot gas flows out through the slots of the switching contact 18, this can be provided on the inside with a sleeve 30, as shown in FIG. This sleeve can consist of a conductive material, for example copper.

Beim Ausschalten strömen, wie bereits erwähnt, heiße Gase von der Schaltstelle nach oben durch den Schaltkontakt 18 und das Loch 21 gegen den oberen Deckel 24. Dies kann dazu führen, daß von dem Deckel 24 eine Druckwelle reflektiert wird, die durch das Loch 21 zur Schaltstelle wandert und den Ausschaltvorgang stört. Um dies zu verhindern, ist an der Innenseite des Deckels eine Erhöhung oder Warze 25 angebracht, welche den Gasstrom radial nach außen zur Wand des Gehäuses umlenkt, wo er nach unten in Längsrichtung des Gehäuses umgelenkt wird und allmählich abkühlt. Diese Wirkung kann dadurch verstärkt werden, daß der Deckel nahe seiner Peripherie auf der Innenseite einen Wulst 28 hat, so daß die Innenseite des Deckels eine ringförmige Mulde bildet, die den Gasstrom nach außen und dann nach unten umlenkt.When switching off, as already mentioned, hot gases flow upward from the switching point through the switching contact 18 and the hole 21 against the upper cover 24. This can result in a pressure wave being reflected by the cover 24 which passes through the hole 21 to Switching point moves and disrupts the switch-off process. To prevent this, an increase or wart 25 is attached to the inside of the cover, which deflects the gas flow radially outwards to the wall of the housing, where it is deflected downwards in the longitudinal direction of the housing and gradually cools down. This effect can be enhanced by the fact that the lid has a bead 28 on the inside near its periphery, so that the inside of the lid forms an annular depression which deflects the gas flow outwards and then downwards.

Um zu vermeiden, daß der Gasstrom von den Seiten des Gehäuses zur Schaltstelle hin reflektiert wird, wird diese mit einer oberen isolierenden Wand 26 umgeben, die die Schaltstelle nach unten hin überragt. Eine ähnliche isolierende Wand 27 ist im unteren Teil des Gehäuses angeordnet, um den Hauptkontakt 7 gegen die heißen Gase zu schützen.In order to prevent the gas flow from being reflected from the sides of the housing towards the switching point, the latter is surrounded by an upper insulating wall 26 which projects downward beyond the switching point. A similar insulating wall 27 is arranged in the lower part of the housing in order to protect the main contact 7 against the hot gases.

Die Erfindung kann auch bei Schaltern mit Löschgasbeblasung sowohl durch den festen wie durch den beweglichen Schaltkontakt angewendet werden.The invention can also be applied to switches with extinguishing gas blowing through both the fixed and the movable switching contact.

Claims (6)

1. Compressed-gas circuit breaker with a sleeve-shaped stationary contact (18) and a corresponding rod- or tubeshaped, axially movable contact (17) and a pump assembly comprising a piston (15) a cylinder (8, 9) which pump assembly (8, 9, 15, 16) is arranged to blast, during the circuit interruption process, pressurized gas around the movable contact and through the stationary contact, the movable contact, for guiding the gas stream, being provided with an insulating cylindrical sleeve (19) encircling the stationary contact in the closed- circuit position and during the interruption process, characterized in that the insulation sleeve (19) extends beyond the free end of the movable contact (17), that its inner diameter is only slightly larger than the outer diameter of the stationary contact (18), and that a ring (20) is fixedly attached to the free end of the stationary contact (18) facing towards the movable contact (17), said ring (20) sealing between the insulating sleeve (19) and the stationary contact (18) during the interrupting process and covering the end face of the contact (18) in an arc-diverting manner.
2. Compressed-gas circuit breaker according to Claim 1, characterized in that a sleeve (30) is arranged on the inner side of the stationary contact (18).
3. Compressed-gas circuit breaker according to claim 1 or 2, characterized in that in the case of using an insulating casing (22) with an upper and a lower lid (24, 23), the lid (24) is provided, on its inner side above the sleeve-shaped stationary contact, with a projection or a nipple (25) which is formed in such a way that the gas stream is diverted away from the stationary contact during the interrupting process.
4. Compressed-gas circuit breaker according to Claim 3, characterized in that the stationary contact (18) is surrounded by a stationary insulating wall (26).
5. Compressed-gas circuit breaker according to any of the preceding claims, characterized in that a stationary insulating wall (27) surrounds that end of the movable contact (17) which faces away from the stationary contact (18).
6. Compressed-gas circuit breaker according to any of claims 3 to 5, characterized in that the upper lid (24) is provided on its inner side with an inwardly directed bulge (28), shaped in such a way that the inner side of the lid takes the form of an annular trough.
EP84112381A 1983-10-17 1984-10-13 Compressed-gas circuit breaker Expired EP0141329B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8305684 1983-10-17
SE8305684A SE448793B (en) 1983-10-17 1983-10-17 gas blast

Publications (2)

Publication Number Publication Date
EP0141329A1 EP0141329A1 (en) 1985-05-15
EP0141329B1 true EP0141329B1 (en) 1989-01-25

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DE (1) DE3476490D1 (en)
SE (1) SE448793B (en)

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US10002733B2 (en) * 2016-03-02 2018-06-19 General Electric Technology Gmbh Internal tulip sleeve of the female arcing contact of a high voltage electric circuit breaker

Citations (1)

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Also Published As

Publication number Publication date
SE448793B (en) 1987-03-16
SE8305684L (en) 1985-04-18
DE3476490D1 (en) 1989-03-02
SE8305684D0 (en) 1983-10-17
EP0141329A1 (en) 1985-05-15

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