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EP0025918B1 - Current limiter - Google Patents

Current limiter Download PDF

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Publication number
EP0025918B1
EP0025918B1 EP80105295A EP80105295A EP0025918B1 EP 0025918 B1 EP0025918 B1 EP 0025918B1 EP 80105295 A EP80105295 A EP 80105295A EP 80105295 A EP80105295 A EP 80105295A EP 0025918 B1 EP0025918 B1 EP 0025918B1
Authority
EP
European Patent Office
Prior art keywords
contacts
current
spring
arc
current limiting
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
EP80105295A
Other languages
German (de)
French (fr)
Other versions
EP0025918A1 (en
Inventor
Wilfried Dipl.-Phys. Haas
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0025918A1 publication Critical patent/EP0025918A1/en
Application granted granted Critical
Publication of EP0025918B1 publication Critical patent/EP0025918B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/76—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor
    • H01H33/77—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor wherein the break is in air at atmospheric pressure

Definitions

  • the invention relates to a current limiter with contacts which are movable relative to one another in the axial direction, one of which is provided with a compression spring, the spring force of which acts against the axial opening force of the contact, and with an arc chamber, the walls of which are made of gas-emitting material.
  • Such current limiters can be arranged in series with a circuit breaker in the circuit.
  • a known embodiment of a device for current limitation contains switching contacts which are arranged axially to one another and are movable relative to one another.
  • the contact ends are surrounded by a hollow cylindrical insulating material body, the walls of which consist of gas-emitting material at elevated temperature.
  • a compression spring arranged coaxially to one of the contacts provides the pressing force when the contacts are closed and is also provided as an electrodynamic drive for the contact opening. If the current exceeds a predetermined value, the pressure spring through which the current flows contracts under the action of its magnetic forces and the contacts open. The resulting arc releases gases from the chamber walls, which increase the pressure in the chamber. After a predetermined opening path of the contacts, the gas can flow out into an enlarged chamber volume which is provided with outlet openings for the gas. The increase in pressure and the increasing contact distance cause the increase in the arc voltage required to limit the current.
  • the manufacture and dimensioning of the compression spring, which must carry the nominal current is complex (CH-A5-566 640).
  • the invention has for its object to improve this known device for current limitation, in particular the effort for the device and the mechanical stress at the contact opening should be reduced.
  • the compression spring has a non-linear spring characteristic, the spring constant of which increases with increasing opening travel of the contacts.
  • the compression spring can preferably consist of annular disc springs, but conical spiral springs are also suitable, for example.
  • the inner wall of the arc channel consists of an electrically insulating material which releases gas at elevated temperature, for example of a gas-releasing plastic, in particular a fluoroplastic (Teflon) derived from polytetrafluoroethylene.
  • a gas-releasing plastic in particular a fluoroplastic (Teflon) derived from polytetrafluoroethylene.
  • Teflon fluoroplastic
  • the build-up of pressure and the cooling due to evaporation of the wall material result in arcing field strengths of at least a few 100 V / cm, in particular considerably more than 500 V / cm.
  • the spring force which acts as a braking force against the opening force of the contacts, is also increased accordingly.
  • the impact stress on the housing of the device when the contacts are opened is accordingly correspondingly low.
  • the arc duct can be provided with blow-out openings for the gas released from the duct wall.
  • two current-carrying contacts are designated 2 and 4, which are arranged axially to one another and are each provided with a contact pad 3 and 5 at their opposite ends.
  • the contact 4 is provided with a flange, not shown in the figure, on which a hollow cylindrical housing 6 is placed, which consists of a pressure-resistant material, for example steel, and is electrically insulated from at least one of the contacts 2 and 4.
  • the contact 2 is passed through the cover of the housing 6, which is not designated in any more detail.
  • the contact 2 is also provided with a flange, which serves as a stop for a compression spring 8, which may preferably consist of several, for example about 20 to 30 disc springs with a spring constant increasing in the opening direction, and only a small pressing force when the contacts 2 and 4 are closed supplies for the two contacts.
  • the contacts 2 and 4 are surrounded within the housing by a hollow cylindrical lining 10, which forms an arc channel, which consists of a gas-emitting material at a higher temperature and whose inner diameter does not change at least not significantly over the entire stroke of the movable contact 2.
  • the pressure force of the compression spring 8 can be, for example 15 N can be selected. If the current increases to 30 times the nominal current, contacts 2 and 4 open due to the current forces that occur. With increasing opening travel of the contacts, the spring force also increases accordingly, so that with an opening travel of 10 mm, for example, the spring force is 200 N.
  • the inner diameter of the lining 10 can be selected a few tenths of a millimeter, for example approximately 0.2 to 0.4 mm larger than the diameter of the ends of the contacts 2 and 4.
  • the arc chamber can be provided with openings 12 which act as blow-out openings for the gases released by the arc and limit the pressure in the chamber accordingly.
  • a current limiting resistor (14) can expediently be connected in parallel with the current limiter, the resistance value of which can be, for example, 30 mOhm. As soon as the voltage requirement at the arc becomes higher than the voltage drop at the current limiting resistor, the arc commutates to this resistor. The arc between contacts 2 and 4 in the chamber of the current limiter is extinguished and the short-circuit current limited in current limiting resistor 14 to, for example, 14 kA is extinguished by a main switch, not shown in the figure, arranged in series with the current limiter.
  • the contact 2 is designed to be movable and provided with the compression spring 8.
  • the contact 4 is also movable in the axial direction and is provided with a further spring.
  • the double contact opening path and thus a corresponding increase in the arc rise and the arc voltage reached are obtained.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Breakers (AREA)

Description

Die Erfindung bezieht sich auf einen Strombegrenzer mit in axialer Richtung relativ zueinander beweglichen Kontakten, von denen einer mit einer Druckfeder versehen ist, deren Federkraft gegen die axiale Öffnungskraft des Kontaktes wirkt, und mit einer Lichtbogenkammer, deren Wände aus gasabgebendem Material bestehen. Solche Strombegrenzer können in Reihe mit einem Leistungsschalter im Stromkreis angeordnet werden.The invention relates to a current limiter with contacts which are movable relative to one another in the axial direction, one of which is provided with a compression spring, the spring force of which acts against the axial opening force of the contact, and with an arc chamber, the walls of which are made of gas-emitting material. Such current limiters can be arranged in series with a circuit breaker in the circuit.

Eine bekannte Ausführungsform einer Vorrichtung zur Strombegrenzung enthält axial zueinander angeordnete und relativ zueinander bewegliche Schaltkontakte. Die Kontaktenden sind von einem hohlzylindrischen Isolierstoffkörper umgeben, dessen Wände aus bei erhöhter Temperatur gasabgebendem Material bestehen. Eine koaxial zu einem der Kontakte angeordnete Druckfeder liefert die Andruckkraft bei geschlossenen Kontakten und ist zugleich als elektrodynamischer Antrieb für die Kontaktöffnung vorgesehen. Überschreitet die Stromstärke einen vorgegebenen Wert, so zieht sich die vom Strom durchflossene Druckfeder unter der Wirkung ihrer magnetischen Kräfte zusammen und die Kontakte öffnen. Durch den entstehenden Lichtbogen werden aus den Kammerwänden Gase ausgelöst, die den Druck in der Kammer erhöhen. Nach einem vorbestimmten Öffnungsweg der Kontakte kann das Gas in ein erweitertes Kammervolumen abströmen, das mit Austrittsöffnungen für das Gas versehen ist. Der Druckanstieg und der zunehmende Kontaktabstand bewirkt die zur Strombegrenzung erforderliche Erhöhung der Lichtbogenspannung. Die Herstellung und Dimensionierung der Druckfeder, die den Nennstrom führen muß, ist jedoch aufwendig (CH-A5-566 640).A known embodiment of a device for current limitation contains switching contacts which are arranged axially to one another and are movable relative to one another. The contact ends are surrounded by a hollow cylindrical insulating material body, the walls of which consist of gas-emitting material at elevated temperature. A compression spring arranged coaxially to one of the contacts provides the pressing force when the contacts are closed and is also provided as an electrodynamic drive for the contact opening. If the current exceeds a predetermined value, the pressure spring through which the current flows contracts under the action of its magnetic forces and the contacts open. The resulting arc releases gases from the chamber walls, which increase the pressure in the chamber. After a predetermined opening path of the contacts, the gas can flow out into an enlarged chamber volume which is provided with outlet openings for the gas. The increase in pressure and the increasing contact distance cause the increase in the arc voltage required to limit the current. However, the manufacture and dimensioning of the compression spring, which must carry the nominal current, is complex (CH-A5-566 640).

Der Erfindung liegt die Aufgabe zugrunde, diese bekannte Vorrichtung zur Strombegrenzung zu verbessern, insbesondere soll der Aufwand für die Vorrichtung und die mechanische Beanspruchung bei der Kontaktöffnung vermindert werden.The invention has for its object to improve this known device for current limitation, in particular the effort for the device and the mechanical stress at the contact opening should be reduced.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Druckfeder eine nichtlineare Federcharakteristik besitzt, deren Federkonstante mit zunehmendem Öffnungsweg der Kontakte ansteigt. Die Druckfeder kann vorzugsweise aus ringförmigen Tellerfedern bestehen, es sind jedoch beispielsweise auch konische Spiralfedern geeignet. Bei geschlossenen Kontakten ist die Andruckkraft der Feder gering, so daß bei einer Stromerhöhung auf einem mehrfachen Betrag des Nennstromes, beispielsweise im Kurzschlußfall bei etwa 30fachem Nennstrom, die Kontakte schon durch die auftretenden Stromengekräfte geöffnet werden. Der entstehende Lichtbogen brennt in einem Kanal, dessen Durchmesser nicht wesentlich größer ist als der Durchmesser des beweglichen Kontaktes und über den Öffnungsweg dieses Kontaktes wenigstens annähernd gleich bleibt. Die Innenwand des Lichtbogenkanals besteht aus elektrisch isolierendem Material, das bei erhöhter Temperatur Gas abgibt, beispielsweise aus einem gasabgebenden Kunststoff, insbesondere einem aus Polytetrafluoräthylen abgeleiteten Fluorkunststoff (Teflon). Infolge der Verdampfung von Kanalwandmaterial treten hohe Druckkräfte auf, die eine weitere schnelle Kontaktöffnung bewirken. Durch den Druckaufbau und die Kühlung infolge Wandmaterialverdampfung erhält man Lichtbogenfeldstärken von wenigstens einigen 100 V/cm, insbesondere wesentlich mehr als 500 V/cm. Mit zunehmendem Öffnungsweg der Kontakte wird auch die Federkraft entsprechend erhöht, die als Bremskraft gegen die Öffnungskraft der Kontakte wirkt. Die Stoßbeanspruchung des Gehäuses der Vorrichtung beim Öffnen der Kontakte ist somit entsprechend gering.This object is achieved in that the compression spring has a non-linear spring characteristic, the spring constant of which increases with increasing opening travel of the contacts. The compression spring can preferably consist of annular disc springs, but conical spiral springs are also suitable, for example. When the contacts are closed, the contact pressure of the spring is low, so that when the current increases to a multiple of the nominal current, for example in the event of a short circuit at approximately 30 times the nominal current, the contacts are opened by the current forces that occur. The resulting arc burns in a channel, the diameter of which is not substantially larger than the diameter of the movable contact and remains at least approximately the same over the opening path of this contact. The inner wall of the arc channel consists of an electrically insulating material which releases gas at elevated temperature, for example of a gas-releasing plastic, in particular a fluoroplastic (Teflon) derived from polytetrafluoroethylene. As a result of the evaporation of duct wall material, high pressure forces occur, which cause a further rapid contact opening. The build-up of pressure and the cooling due to evaporation of the wall material result in arcing field strengths of at least a few 100 V / cm, in particular considerably more than 500 V / cm. As the opening distance of the contacts increases, the spring force, which acts as a braking force against the opening force of the contacts, is also increased accordingly. The impact stress on the housing of the device when the contacts are opened is accordingly correspondingly low.

Um den Strombegrenzer vor unzulässiger Druckbeanspruchung zu schützen, kann der Lichtbogenkanal mit Ausblasöffnungen für das aus der Kanalwand ausgelöste Gas versehen werden.In order to protect the current limiter from impermissible pressure loads, the arc duct can be provided with blow-out openings for the gas released from the duct wall.

Zur weiteren Erläuterung der Erfindung wird auf die Zeichnung Bezug genommen, in der ein Ausführungsbeispiel eines Strombegrenzers nach der Erfindung schematisch veranschaulicht ist.To further explain the invention, reference is made to the drawing, in which an embodiment of a current limiter according to the invention is schematically illustrated.

In der Figur sind zwei stromführende Kontakte mit 2 und 4 bezeichnet, die axial zueinander angeordnet und an ihren einander gegenüberstehenden Enden jeweils mit einer Kontaktauflage 3 bzw. 5 versehen sind. Der Kontakt 4 ist mit einem in der Figur nicht näher bezeichneten Flansch versehen, auf den ein hohlzylindrisches Gehäuse 6 aufgesetzt ist, das aus einem druckfesten Material, beispielsweise Stahl, besteht und gegen mindestens einen der Kontakte 2 und 4 elektrisch isoliert ist. Durch den nicht näher bezeichneten Deckel des Gehäuses 6 ist der Kontakt 2 hindurchgeführt. Der Kontakt 2 ist ebenfalls mit einem Flansch versehen, der als Anschlag für eine Druckfeder 8 dient, die vorzugsweise aus mehreren, beispielsweise etwa 20 bis 30 Tellerfedern mit in Öffnungsrichtung steigender Federkonstante bestehen kann und im geschlossenen Zustand der Kontakte 2 und 4 nur eine geringe Andruckkraft für die beiden Kontakte liefert. Die Kontakte 2 und 4 sind innerhalb des Gehäuses von einer hohlzylindrischen Auskleidung 10 umgeben, die einen Lichtbogenkanal bildet, der aus einem bei höherer Temperatur gasabgebendem Material besteht und dessen innerer Durchmesser sich über den gesamten Hub des beweglichen Kontaktes 2 sich wenigstens nicht wesentlich ändert.In the figure, two current-carrying contacts are designated 2 and 4, which are arranged axially to one another and are each provided with a contact pad 3 and 5 at their opposite ends. The contact 4 is provided with a flange, not shown in the figure, on which a hollow cylindrical housing 6 is placed, which consists of a pressure-resistant material, for example steel, and is electrically insulated from at least one of the contacts 2 and 4. The contact 2 is passed through the cover of the housing 6, which is not designated in any more detail. The contact 2 is also provided with a flange, which serves as a stop for a compression spring 8, which may preferably consist of several, for example about 20 to 30 disc springs with a spring constant increasing in the opening direction, and only a small pressing force when the contacts 2 and 4 are closed supplies for the two contacts. The contacts 2 and 4 are surrounded within the housing by a hollow cylindrical lining 10, which forms an arc channel, which consists of a gas-emitting material at a higher temperature and whose inner diameter does not change at least not significantly over the entire stroke of the movable contact 2.

Bei einem Strombegrenzer für einen Nennstrom von beispielsweise 0,2 kA kann die Andruckkraft der Druckfeder 8 beispielsweise 15 N gewählt werden. Bei einer Stromerhöhung auf beispielsweise den 30fachen Nennstrom öffnen die Kontakte 2 und 4 schon durch die auftretenden Stromengekräfte. Mit zunehmendem Öffnungsweg der Kontakte nimmt auch die Federkraft entsprechend zu, so daß bei einem Öffnungsweg von beispielsweise 10 mm die Federkraft 200 N beträgt. Der Innendurchmesser der Auskleidung 10 kann einige Zehntelmillimeter, beispielsweise etwa 0,2 bis 0,4 mm größer als der Durchmesser der Enden der Kontakte 2 und 4 gewählt werden. Da der Lichtbogen in einem Kanal brennt, aus dessen Wand der Lichtbogen Gas auslöst, treten infolge der Verdampfung Überdrücke auf, die beispielsweise etwa 100 bis 500 bar betragen können. Die entsprechenden Kräfte öffnen den beweglichen Kontakt 2 weiter auf beispielsweise etwa 2 bis 3 cm, wobei die Federkraft weiter ansteigt, beispielsweise bei einem Öffnungsweg von 2 cm auf eine Kraft von 800 N. Diese hohe Federkraft wirkt als Bremskraft gegen die Öffnungskraft der Kontakte, so daß nur eine verhältnismäßig geringe Stoßwirkung des Kontaktes 2 auf den Deckel des Gehäuses 6 auftritt.With a current limiter for a nominal current of, for example, 0.2 kA, the pressure force of the compression spring 8 can be, for example 15 N can be selected. If the current increases to 30 times the nominal current, contacts 2 and 4 open due to the current forces that occur. With increasing opening travel of the contacts, the spring force also increases accordingly, so that with an opening travel of 10 mm, for example, the spring force is 200 N. The inner diameter of the lining 10 can be selected a few tenths of a millimeter, for example approximately 0.2 to 0.4 mm larger than the diameter of the ends of the contacts 2 and 4. Since the arc burns in a channel from the wall of which the arc releases gas, overpressures occur as a result of the evaporation, which can be, for example, about 100 to 500 bar. The corresponding forces further open the movable contact 2 to, for example, approximately 2 to 3 cm, the spring force increasing further, for example with an opening travel of 2 cm to a force of 800 N. This high spring force acts as a braking force against the opening force of the contacts, see above that only a relatively small impact effect of the contact 2 on the cover of the housing 6 occurs.

In einer besonderen Ausführungsform des Strombegrenzers kann die Lichtbogenkammer mit Öffnungen 12 versehen sein, die als Ausblasöffnungen für die durch den Lichtbogen ausgelösten Gase wirken und den Druck in der Kammer entsprechend begrenzen.In a special embodiment of the current limiter, the arc chamber can be provided with openings 12 which act as blow-out openings for the gases released by the arc and limit the pressure in the chamber accordingly.

Dem Strombegrenzer kann zweckmäßig noch ein Strombegrenzungswiderstand (14) parallel geschaltet sein, dessen Widerstandswert beispielsweise 30 mOhm betragen kann. Sobald der Spannungsbedarf am Lichtbogen höher wird als der Spannungsabfall am Strombegrenzungswiderstand, kommutiert der Lichtbogen auf diesen Widerstand. Der Lichtbogen zwischen den Kontakten 2 und 4 in der Kammer des Strombegrenzers erlischt und der im Strombegrenzungswiderstand 14 auf beispielsweise 14 kA begrenzte Kurzschlußstrom wird von einem in der Figur nicht dargestellten in Reihe mit dem Strombegrenzer angeordneten Hauptschalter gelöscht.A current limiting resistor (14) can expediently be connected in parallel with the current limiter, the resistance value of which can be, for example, 30 mOhm. As soon as the voltage requirement at the arc becomes higher than the voltage drop at the current limiting resistor, the arc commutates to this resistor. The arc between contacts 2 and 4 in the chamber of the current limiter is extinguished and the short-circuit current limited in current limiting resistor 14 to, for example, 14 kA is extinguished by a main switch, not shown in the figure, arranged in series with the current limiter.

Einige Millisekunden, beispielsweise 15 Millisekunden, nach dem Erlöschen des Lichtbogens werden die Kontakte 2 und 4 unter der Wirkung der Druckfeder 8 wieder geschlossen und der Strombegrenzer ist erneut verwendungsfähig.A few milliseconds, for example 15 milliseconds, after the arc has been extinguished, the contacts 2 and 4 are closed again under the action of the compression spring 8 and the current limiter can be used again.

Im Ausführungsbeispiel ist nur der Kontakt 2 beweglich ausgeführt und mit der Druckfeder 8 versehen. Unter Umständen kann es zweckmäßig sein, beide Kontakte 2 und 4 in beweglicher Ausführungsform zu wählen, bei der auch der Kontakt 4 in Achsrichtung beweglich und mit einer weiteren Feder versehen ist. In dieser Ausführungsform erhält man den doppelten Kontaktöffnungsweg und damit eine entsprechende Erhöhung des Lichtbogenanstiegs und der erreichten Lichtbogenspannung.In the exemplary embodiment, only the contact 2 is designed to be movable and provided with the compression spring 8. Under certain circumstances, it may be appropriate to select both contacts 2 and 4 in a movable embodiment, in which the contact 4 is also movable in the axial direction and is provided with a further spring. In this embodiment, the double contact opening path and thus a corresponding increase in the arc rise and the arc voltage reached are obtained.

Claims (4)

1. A current limiting device having contacts (2, 4) which are movable relative to one another in the axial direction and one of which is provided with a compression spring (8), the spring force of which opposes the axial opening force of the contacts (2, 4), and an arc chamber, the walls of which are made of gas-emitting material, characterised in that the compression spring (8) has a non-linear spring characteristic, the spring constant of which increases with increasing opening displacement of the contacts (2, 4).
2. A current limiting device according to Claim 1, characterised in that annular disc springs are provided as compression springs (8).
3. A current limiting device according to Claim 1 or Claim 2, characterised in that the arc chamber is in the form of an arc channel, the diameter of which remains at least approximately constant over the opening path of the contacts (2,4).
4. A current limiting device according to one of Claims 1 to 3, characterised in that a current-limiting resistor (14) is connected in parallel to the current limiting device.
EP80105295A 1979-09-17 1980-09-04 Current limiter Expired EP0025918B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792937490 DE2937490A1 (en) 1979-09-17 1979-09-17 CURRENT LIMITERS
DE2937490 1979-09-17

Publications (2)

Publication Number Publication Date
EP0025918A1 EP0025918A1 (en) 1981-04-01
EP0025918B1 true EP0025918B1 (en) 1983-05-25

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ID=6081044

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Application Number Title Priority Date Filing Date
EP80105295A Expired EP0025918B1 (en) 1979-09-17 1980-09-04 Current limiter

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Country Link
US (1) US4367508A (en)
EP (1) EP0025918B1 (en)
JP (1) JPS5652825A (en)
DE (1) DE2937490A1 (en)
DK (1) DK393280A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3179349B2 (en) * 1996-04-03 2001-06-25 三菱電機株式会社 Switchgear
DE10118746B4 (en) * 2001-04-17 2004-06-24 Siemens Ag Method for operating a switching device with a switchable current limiter and associated arrangement
NL1020224C2 (en) * 2002-03-21 2003-09-23 Holec Holland Nv Arc-resistant cupboard for switching system.
EP2814049A1 (en) * 2013-06-11 2014-12-17 ABB Technology AG Drive mechanism for a switching device

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162719A (en) * 1938-06-14 1939-06-20 Matilda K Hay Combination spring bellows control device
CH318307A (en) * 1952-10-23 1956-12-31 Voigt & Haeffner Ag Liquid switch with a pump device for the extinguishing liquid actuated by the switch pin
DE1954979B2 (en) * 1969-10-31 1971-10-28 CURRENT LIMITING DEVICE
JPS5024013B1 (en) * 1970-12-16 1975-08-12
CH564842A5 (en) * 1973-11-05 1975-07-31 Bbc Brown Boveri & Cie
CH566640A5 (en) * 1973-11-12 1975-09-15 Bbc Brown Boveri & Cie
US3909676A (en) * 1974-04-22 1975-09-30 Ite Imperial Corp Self-operating fault current limiter switch
JPS5818730B2 (en) * 1975-01-24 1983-04-14 テラサキデンキサンギヨウ カブシキガイシヤ Genri Yuusouchi
JPS5185450A (en) * 1975-01-24 1976-07-27 Terasaki Denki Sangyo Kk GENRYUSOCHI
JPS5185448A (en) * 1975-01-24 1976-07-27 Terasaki Denki Sangyo Kk GENRYUSOCHI
JPS54299B2 (en) * 1975-02-26 1979-01-09

Also Published As

Publication number Publication date
EP0025918A1 (en) 1981-04-01
US4367508A (en) 1983-01-04
JPS5652825A (en) 1981-05-12
DK393280A (en) 1981-03-18
DE2937490A1 (en) 1981-04-02

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