EP0046174B1 - Compressed-gas puffer-type circuit interrupter - Google Patents

Compressed-gas puffer-type circuit interrupter Download PDF

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Publication number
EP0046174B1
EP0046174B1 EP19810104754 EP81104754A EP0046174B1 EP 0046174 B1 EP0046174 B1 EP 0046174B1 EP 19810104754 EP19810104754 EP 19810104754 EP 81104754 A EP81104754 A EP 81104754A EP 0046174 B1 EP0046174 B1 EP 0046174B1
Authority
EP
European Patent Office
Prior art keywords
arc
metal tube
nozzle
insulating
layer
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
Application number
EP19810104754
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German (de)
French (fr)
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EP0046174A1 (en
Inventor
Werner Heiss
Johann Wagner
Günter Horstmann
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.)
Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication of EP0046174A1 publication Critical patent/EP0046174A1/en
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Publication of EP0046174B1 publication Critical patent/EP0046174B1/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
    • H01H33/7015—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
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber

Definitions

  • the invention relates to an autopneumatic gas pressure switch with an insulating nozzle, from which the insulating gas compressed in a switching section pump during the switch-off for blowing a switching arc that burns between power contacts emerges, the space into which the arc gases flow is surrounded by a cylindrical metal tube in which the Insulating nozzle, which has a correspondingly configured screen, is slidably guided, the insulating nozzle having a cylindrical extension which is arranged coaxially to the metal tube, so that the space is formed by the metal tube, the extension and the screen of the insulating nozzle.
  • the known insulating nozzles for high-voltage circuit breakers consist entirely of an insulating material such as polytetrafluoroethylene. Such insulating materials with good dielectric properties and good resistance to arcing usually have a lack of mechanical strength. This mechanical strength is often not sufficient in the case of insulating nozzles of the type mentioned at the beginning. This also applies to the insulating nozzle of the above-mentioned autopneumatic gas pressure switch, which is described in EP-A-0 016 983 (Art. 54 (3), (4) EPC). This insulating nozzle has the highest possible insulating capacity with the lowest possible weight.
  • the invention is therefore based on the object of providing an autopneumatic gas pressure switch of the type mentioned at the outset with good dielectric properties and good arc resistance of the insulating nozzle, the insulating nozzle having improved mechanical strength.
  • the insulating nozzle is constructed from layered material in such a way that the layer facing the metallic tube consists of a pressure-resistant plastic of high electrical strength and low resistance to arcing and that the layer facing the power contacts is resistant to arcing.
  • the solution according to the invention enables the functions of the insulating nozzle, in particular the mechanical strength and the resistance to arcing, to be optimized in a very advantageous manner.
  • the plastic is fiber-reinforced.
  • the arc-resistant layer facing the power contacts is opaque to radiation.
  • the arc-resistant layer is made radiation-opaque by coloring.
  • the drawing shows a switch pole of an autopneumatic high-voltage gas circuit breaker.
  • a contact system is arranged within an insulator 1 in a closed switching chamber.
  • the switch has an upper plate-shaped electrical connection 2 and a lower plate-shaped electrical connection 3.
  • the power path of the switching path is formed by a fixed power contact 4, which is conductively connected to the upper plate-shaped electrical connection 2, in connection with a movable power contact 5, the arcing contact.
  • This movable power contact 5 is conductively connected to a movable cylinder 6, which cooperates with a fixed piston 7, which is attached to the lower plate-shaped electrical connection 3, as a switching path pump for generating the required blowing pressure in the event of a switch.
  • the movable cylinder 6 is connected to a fork 8, which in turn is connected to a drive rod (not shown).
  • the drive rod is actuated in the usual way by a hydraulic, pneumatic spring drive or the like.
  • An insulating nozzle 12 is fixedly connected to the movable cylinder 6 in the area of the movable power contact 5, from which the gas compressed in the switching section pump emerges when it is switched off and blows on the switching arc which is between the power contacts 4 and 5.
  • This insulating nozzle 12 has a screen 13, which is slidably guided in a fixed metal tube 16 connected to the upper plate-shaped electrical connection 2.
  • a cylindrical extension 14 made of insulating material and directed toward the fixed power contact 4 is attached to the screen 13 and is aligned coaxially with the metal tube 16.
  • This cylindrical extension 14, the length of which is matched to the length of the switching path, has at its open end a circumferential projection 15 which bears against the inner wall of the metal tube 16.
  • the transition between the metal tube 16 and the cylindrical extension 14 is expediently gas-tight.
  • a seal 15a is provided in the projection 15 for gas-tight sealing or for the gas-tight partitioning of the space 20 in which the arc cloud is located.
  • the nominal current contact path is matched to the power current path in such a way that it opens shortly before the power current path is opened, so that the arc is only in the power current path.
  • the space 20 is formed by the metal tube 16, the cylindrical extension 14 and the screen 13 of the insulating nozzle 12.
  • the metal tube 16 also has the function of the nominal current guide and is consequently provided as a nominal current contact piece with corresponding nominal current contact surfaces 16a. These nominal current contact surfaces 16a cooperate with contact surfaces 17, which have a circumferential projection on that of the iso Lierdüse 12 facing end of the movable cylinder 6 are formed and which, when switched on, bear against the nominal current contact surfaces 16a provided on the metal tube 16.
  • the insulating nozzle 12 consists of layered material.
  • the layer 13a of the screen 13 facing the fixed power contact 4 consists of an arc-resistant material which is made opaque to radiation by coloring.
  • the layer 13b facing the metal tube 16, which according to the invention can form a contact piece of a nominal current path, consists of a pressure-resistant plastic of high electrical strength.
  • the pressure-resistant plastic can be fiber-reinforced.

Landscapes

  • Circuit Breakers (AREA)

Description

Die Erfindung betrifft einen autopneumatischen Druckgasschalter mit einer Isolierdüse, aus der das in einer Schaltstreckenpumpe während der Ausschaltung komprimierte Isoliergas zur Beblasung eines zwischen Leistungskontakten brennenden Schaltlichtbogens austritt, wobei der Raum, in den die Lichtbogengase einströmen, von einem zylindrischen Metallrohr umgeben ist, in dem die Isolierdüse, die einen entsprechend ausgestalteten Schirm aufweist, gleitend geführt ist, wobei die Isolierdüse einen zylinderförmigen Fortsatz aufweist, der koaxial zu dem Metallrohr angeordnet ist, so dass der Raum von dem Metallrohr, dem Fortsatz und dem Schirm der Isolierdüse gebildet wird.The invention relates to an autopneumatic gas pressure switch with an insulating nozzle, from which the insulating gas compressed in a switching section pump during the switch-off for blowing a switching arc that burns between power contacts emerges, the space into which the arc gases flow is surrounded by a cylindrical metal tube in which the Insulating nozzle, which has a correspondingly configured screen, is slidably guided, the insulating nozzle having a cylindrical extension which is arranged coaxially to the metal tube, so that the space is formed by the metal tube, the extension and the screen of the insulating nozzle.

Die bekannten Isolierdüsen für Hochspannungs-Leistungsschalter bestehen durchgehend aus einem Isoliermaterial, wie zum Beispiel Polytetrafluoraethylen. Derartige Isoliermaterialien mit guten dielektrischen Eigenschaften und guter Lichtbogenbeständigkeit weisen meist mangelnde mechanische Festigkeit auf. Diese mechanische Festigkeit ist bei Isolierdüsen der eingangs genannten Art vielfach nicht ausreichend. Dieses trifft auch auf die Isolierdüse des oben erwähnten autopneumatischen Druckgasschalters zu, der in der EP-A-0 016 983 (Art. 54 (3), (4) EPÜ) beschrieben ist. Diese Isolierdüse weist bei einem möglichst geringen Gewicht eine möglichst hohe Isolationsfähigkeit auf.The known insulating nozzles for high-voltage circuit breakers consist entirely of an insulating material such as polytetrafluoroethylene. Such insulating materials with good dielectric properties and good resistance to arcing usually have a lack of mechanical strength. This mechanical strength is often not sufficient in the case of insulating nozzles of the type mentioned at the beginning. This also applies to the insulating nozzle of the above-mentioned autopneumatic gas pressure switch, which is described in EP-A-0 016 983 (Art. 54 (3), (4) EPC). This insulating nozzle has the highest possible insulating capacity with the lowest possible weight.

Der Erfindung liegt daher die Aufgabe zugrunde, einen autopneumatischen Druckgasschalter der eingangs genannten Art mit guten dielektrischen Eigenschaften und guter Lichtbogenbeständigkeit der Isolierdüse zu schaffen, wobei die Isolierdüse eine verbesserte mechanische Festigkeit aufweist.The invention is therefore based on the object of providing an autopneumatic gas pressure switch of the type mentioned at the outset with good dielectric properties and good arc resistance of the insulating nozzle, the insulating nozzle having improved mechanical strength.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Isolierdüse aus geschichtetem Material derart aufgebaut ist, dass die dem metallischen Rohr zugewandte Schicht aus einem druckfesten Kunststoff hoher elektrischer Festigkeit und geringer Lichtbogenbeständigkeit besteht und dass die den Leistungskontakten zugewandte Schicht lichtbogenbeständig ist.This object is achieved according to the invention in that the insulating nozzle is constructed from layered material in such a way that the layer facing the metallic tube consists of a pressure-resistant plastic of high electrical strength and low resistance to arcing and that the layer facing the power contacts is resistant to arcing.

Durch die erfindungsgemässe Lösung können die Funktionen der lsolierdüse, insbesondere die mechanische Festigkeit und die Lichtbogenbeständigkeit, in sehr vorteilhafter Weise optimiert werden.The solution according to the invention enables the functions of the insulating nozzle, in particular the mechanical strength and the resistance to arcing, to be optimized in a very advantageous manner.

Gemäss einer Ausgestaltung der Erfindung ist vorgesehen, dass der Kunststoff faserverstärkt ist.According to one embodiment of the invention, it is provided that the plastic is fiber-reinforced.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass die den Leistungskontakten zugewandte lichtbogenbeständige Schicht strahlungsundurchlässig ist. In einer Weiterbildung der Erfindung ist vorgesehen, dass die lichtbogenbeständige Schicht durch Einfärbung strahlungsundurchlässig gemacht ist.Another embodiment of the invention provides that the arc-resistant layer facing the power contacts is opaque to radiation. In a further development of the invention, it is provided that the arc-resistant layer is made radiation-opaque by coloring.

Die Erfindung und ihre Ausgestaltungen sind nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispieles beschrieben.The invention and its embodiments are described below with reference to an embodiment shown in the drawing.

Die Zeichnung zeigt einen Schalterpol eines autopneumatischen Hochspannungs-Druckgas-Leistungsschalters.The drawing shows a switch pole of an autopneumatic high-voltage gas circuit breaker.

Innerhalb eines Isolators 1 ist in einer geschlossenen Schaltkammer ein Kontaktsystem angeordnet. Der Schalter weist einen oberen plattenförmigen elektrischen Anschluss 2 und einen unteren plattenförmigen elektrischen Anschluss 3 auf. Der Leistungspfad der Schaltstrecke wird durch einen feststehenden Leistungskontakt 4, der mit dem oberen plattenförmigen elektrischen Anschluss 2 leitend verbunden ist, in Verbindung mit einem beweglichen Leistungskontakt 5, dem Lichtbogenkontakt, gebildet. Dieser bewegliche Leistungskontakt 5 ist mit einem beweglichen Zylinder 6 leitend verbunden, der mit einem feststehenden Kolben 7, der auf dem unteren plattenförmigen elektrischen Anschluss 3 angebracht ist, als Schaltstreckenpumpe zur Erzeugung des erforderlichen Blasdruckes im Schaltfall zusammenwirkt.A contact system is arranged within an insulator 1 in a closed switching chamber. The switch has an upper plate-shaped electrical connection 2 and a lower plate-shaped electrical connection 3. The power path of the switching path is formed by a fixed power contact 4, which is conductively connected to the upper plate-shaped electrical connection 2, in connection with a movable power contact 5, the arcing contact. This movable power contact 5 is conductively connected to a movable cylinder 6, which cooperates with a fixed piston 7, which is attached to the lower plate-shaped electrical connection 3, as a switching path pump for generating the required blowing pressure in the event of a switch.

Der bewegliche Zylinder 6 ist mit einer Gabel 8 verbunden, die ihrerseits mit einer (nicht dargestellten) Antriebsstange in Verbindung steht. Die Antriebsstange wird in üblicher Weise durch einen hydraulischen, pneumatischen Federantrieb oder dergleichen betätigt. Mit dem beweglichen Zylinder 6 ist im Bereich des beweglichen Leistungskontaktes 5 eine Isolierdüse 12 fest verbunden, aus der das in der Schaltstreckenpumpe beim Ausschalten komprimierte Gas austritt und den Schaltlichtbogen bebläst, der zwischen den Leistungskontakten 4 und 5 steht. Diese Isolierdüse 12 weist einen Schirm 13 auf, der in einem feststehenden, mit dem oberen plattenförmigen elektrischen Anschluss 2 verbundenen Metallrohr 16 gleitend geführt ist.The movable cylinder 6 is connected to a fork 8, which in turn is connected to a drive rod (not shown). The drive rod is actuated in the usual way by a hydraulic, pneumatic spring drive or the like. An insulating nozzle 12 is fixedly connected to the movable cylinder 6 in the area of the movable power contact 5, from which the gas compressed in the switching section pump emerges when it is switched off and blows on the switching arc which is between the power contacts 4 and 5. This insulating nozzle 12 has a screen 13, which is slidably guided in a fixed metal tube 16 connected to the upper plate-shaped electrical connection 2.

Am Schirm 13 ist ein zum feststehenden Leistungskontakt 4 hin gerichteter zylindrischer Fortsatz 14 aus Isolierstoff angebracht, der koaxial zu dem Metallrohr 16 ausgerichtet ist. Dieser zylindrische Fortsatz 14, dessen Länge auf die Länge des Schaltweges abgestimmt ist, weist an seinem offenen Ende einen umlaufenden Vorsprung 15 auf, der an der Innenwand des Metallrohres 16 anliegt. Zweckmässig ist der Übergang zwischen dem Metallrohr 16 und dem zylindrischen Fortsatz 14 gasdicht ausgeführt. Zur gasdichten Abdichtung bzw. zur gasdichten Abschottung des Raumes 20, in dem sich die Lichtbogenwolke befindet, ist im Vorsprung 15 eine Dichtung 15a vorgesehen. Die Nennstromkontaktstrecke ist so mit dem Leistungsstrompfad abgestimmt, dass sie beim Ausschalten kurz vor dem Öffnen des Leistungsstrompfades öffnet, so dass der Lichtbogen allein im Leistungsstrompfad steht.A cylindrical extension 14 made of insulating material and directed toward the fixed power contact 4 is attached to the screen 13 and is aligned coaxially with the metal tube 16. This cylindrical extension 14, the length of which is matched to the length of the switching path, has at its open end a circumferential projection 15 which bears against the inner wall of the metal tube 16. The transition between the metal tube 16 and the cylindrical extension 14 is expediently gas-tight. A seal 15a is provided in the projection 15 for gas-tight sealing or for the gas-tight partitioning of the space 20 in which the arc cloud is located. The nominal current contact path is matched to the power current path in such a way that it opens shortly before the power current path is opened, so that the arc is only in the power current path.

Der Raum 20 wird von dem Metallrohr 16, dem zylindrischen Fortsatz 14 und dem Schirm 13 der Isolierdüse 12 gebildet. Das Metallrohr 16 hat daneben die Funktion der Nennstrom-Führung und ist infolgedessen als Nennstrom-Kontaktstück mit entsprechenden Nennstrom-Kontaktflächen 16a versehen. Diese Nennstrom-Kontaktflächen 16a wirken mit Kontaktflächen 17 zusammen, die an einem umlaufenden Vorsprung an dem der lsolierdüse 12 zugewandten Ende des beweglichen Zylinders 6 ausgebildet sind und die im eingeschalteten Zustand an den am Metallrohr 16 vorgesehenen Nennstrom-Kontaktflächen 16a anliegen.The space 20 is formed by the metal tube 16, the cylindrical extension 14 and the screen 13 of the insulating nozzle 12. The metal tube 16 also has the function of the nominal current guide and is consequently provided as a nominal current contact piece with corresponding nominal current contact surfaces 16a. These nominal current contact surfaces 16a cooperate with contact surfaces 17, which have a circumferential projection on that of the iso Lierdüse 12 facing end of the movable cylinder 6 are formed and which, when switched on, bear against the nominal current contact surfaces 16a provided on the metal tube 16.

Die Isolierdüse 12 besteht aus geschichtetem Material. Die dem feststehenden Leistungskontakt 4 zugewandte Schicht 13a des Schirmes 13 besteht aus einem lichtbogenbeständigen Material, das durch Einfärbung strahlungsundurchlässig gemacht ist. Die dem Metallrohr 16, das erfindungsgemäss ein Kontaktstück eines Nennstrompfades bilden kann, zugewandte Schicht 13b besteht aus einem druckfesten Kunststoff hoher elektrischer Festigkeit. Der druckfeste Kunststoff kann faserverstärkt sein.The insulating nozzle 12 consists of layered material. The layer 13a of the screen 13 facing the fixed power contact 4 consists of an arc-resistant material which is made opaque to radiation by coloring. The layer 13b facing the metal tube 16, which according to the invention can form a contact piece of a nominal current path, consists of a pressure-resistant plastic of high electrical strength. The pressure-resistant plastic can be fiber-reinforced.

Claims (4)

1. Automatic pneumatic pressure-gas switch with an insulating nozzle (12) from which emerges the insulating gas, compressed during switch-off by a pump (6, 7) operated by the switching movement, for blowing on an arc burning between load contacts (4, 5), wherein the space (20) into which the arc gases flow is surrounded by a cylindrical metal tube (16) and the insulating nozzle (12) with a correspondingly shaped guard (13) slides in this, the nozzle (12) having a cylindrical extension (14) arranged coaxial to the metal tube (16) so that the space (20) is bounded by the tube (16), the extension (14) and the guard (13) of the nozzle (12) characterised in that the insulating nozzle (12) is constructed of layered material, that its layer (13b) facing the metal tube (16) is of a pressure resistant plastics material of high electrical strength and limited arc resistance, and that the layer (13a) facing the load contacts (4, 5) is arc resistant.
2. Automatic pneumatic pressure-gas switch according to claim 1 characterised in that the pressure resistant plastics material is reinforced with fibres.
3. Automatic pneumatic pressure-gas switch according to claim 1 characterised in that the layer (13a) which is arc resistant and faces the load contacts (4, 5) is opaque to radiation.
4. Automatic pneumatic pressure-gas switch according to claim 3 characterised in that the layer (13a) which is arc resistant is rendered opaque to radiation by colouring.
EP19810104754 1980-08-14 1981-06-20 Compressed-gas puffer-type circuit interrupter Expired EP0046174B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803030749 DE3030749A1 (en) 1980-08-14 1980-08-14 AUTOPNEUMATIC PRESSURE GAS SWITCH
DE3030749 1980-08-14

Publications (2)

Publication Number Publication Date
EP0046174A1 EP0046174A1 (en) 1982-02-24
EP0046174B1 true EP0046174B1 (en) 1984-09-12

Family

ID=6109609

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810104754 Expired EP0046174B1 (en) 1980-08-14 1981-06-20 Compressed-gas puffer-type circuit interrupter

Country Status (3)

Country Link
EP (1) EP0046174B1 (en)
JP (1) JPS57132623A (en)
DE (1) DE3030749A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57185146U (en) * 1981-05-19 1982-11-24
DE3233004A1 (en) * 1982-09-04 1984-03-08 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Nozzle for an auto-pneumatic compressed-gas circuit breaker

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE918213C (en) * 1942-03-04 1954-09-20 Allg Elekticitaets Ges Insulating body for switching chambers of high-voltage switches, especially nozzle bodies for free-jet compressed gas switches
DE1126473B (en) * 1959-07-09 1962-03-29 Licentia Gmbh Circuit breaker with a flowing extinguishing agent
FR1319991A (en) * 1962-04-20 1963-03-01 Continental Elektro Ind Ag Isolated electric appliance
NL6501780A (en) * 1965-02-12 1966-08-15
DE7906561U1 (en) * 1979-03-09 1983-05-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Auto-pneumatic pressure gas switch
DE2924994A1 (en) * 1979-06-21 1981-01-22 Bbc Brown Boveri & Cie CIRCUIT BREAKER

Also Published As

Publication number Publication date
EP0046174A1 (en) 1982-02-24
DE3030749A1 (en) 1982-02-25
JPS57132623A (en) 1982-08-17

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