EP0177714B1 - Pressurized-gas circuit breaker - Google Patents

Pressurized-gas circuit breaker Download PDF

Info

Publication number
EP0177714B1
EP0177714B1 EP85110187A EP85110187A EP0177714B1 EP 0177714 B1 EP0177714 B1 EP 0177714B1 EP 85110187 A EP85110187 A EP 85110187A EP 85110187 A EP85110187 A EP 85110187A EP 0177714 B1 EP0177714 B1 EP 0177714B1
Authority
EP
European Patent Office
Prior art keywords
gas
channels
hollow space
switch according
switch
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
EP85110187A
Other languages
German (de)
French (fr)
Other versions
EP0177714A3 (en
EP0177714A2 (en
Inventor
Lutz Dr. Niemeyer
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0177714A2 publication Critical patent/EP0177714A2/en
Publication of EP0177714A3 publication Critical patent/EP0177714A3/en
Application granted granted Critical
Publication of EP0177714B1 publication Critical patent/EP0177714B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01H33/76—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
    • 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
    • H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow

Definitions

  • the invention is based on a gas pressure switch according to the preamble of patent claim 1.
  • the invention relates to a prior art, as described for example in DE-PS 28 11 508.
  • the quenching gas heated by the switching arc is guided into a pressure chamber in which it is blown under high pressure after the release of an outflow opening into the expansion space.
  • a device consisting essentially of a tubular extension and interacting with the movable contact piece, which allows the extinguishing gas in the pressure chamber to escape into the expansion space with a delay. and that the outer part of the pressure chamber is also protected from excessive pressures by a valve.
  • a further pressure gas switch designed according to the preamble of claim 1 is known.
  • This switch has a fixed contact with a channel-shaped channel open towards the expansion space. Fluid of high temperature and high pressure generated by the switching arc is led through this channel into the expansion space in order to avoid an excessive increase in the pressure in the pressure chamber.
  • the invention solves the problem of creating a pressure gas switch of the generic type, in which a pressure build-up that is too small for small and a pressure build-up that is too high is avoided with simple means.
  • the switching arc is greatly restricted in the high current phase by suitable guiding of the quenching gas flow, in order then to widen more or less strongly in its downstream arc part depending on the current.
  • a pressure is built up in the pressure accumulator by the arc gas flowing in the axial direction. This ensures that when switching small currents, a large proportion of the arc gas is available to build up pressure. Additional measures to delay the flow of extinguishing gas are therefore unnecessary.
  • part of the arc gas is discharged into the expansion space. As a result, it is no longer necessary to take precautions to ensure that the pressure accumulator is not subjected to excessive pressure when switching short-circuit currents.
  • Fig. 1 denotes an essentially hollow cylindrical housing made of insulating material.
  • This housing is in an atmosphere of insulating gas, such as sulfur hexafluoride at a few bar pressure. It contains two contact pieces 2 and 3 which are movable relative to one another along an axis.
  • the contact piece 2 is supported on a power connection 4 and contains a ring of contact fingers 5 and 6 which delimit a cavity 7 in the contact piece 2.
  • the switching piece 3 is fully cylindrical and movable along the cylinder axis. In the switched-on position of the switch, it is retracted into the cavity 7 and contacts the inner surfaces of the contact fingers 5 and 6 with its outer surface.
  • the contact fingers 6 are somewhat longer at their ends facing away from the free end of the switching element 2 than the contact fingers 5 and thereby save in the switching element 2 channels 8, which extend in the radial direction through an insulating nozzle 9, preferably made of polytetrafluoroethylene (PTFE), into a ring-shaped pressure accumulator 10, which coaxially surrounds the switching elements 2, 3.
  • a ring-shaped pressure accumulator 10 which coaxially surrounds the switching elements 2, 3.
  • check valves 11 At the mouths of the channels 8 in the pressure accumulator 10 there are check valves 11 which close the pressure accumulator 10 with respect to the cavity 7 when the pressure in the cavity 7 drops.
  • the pressure accumulator 10 is essentially delimited by the housing 1 and the outer lateral surface of the insulating nozzle 9 and divided by a flow labyrinth 12.
  • This can consist, for example, of radial annular deflection plates 13 which are offset from one another in the axial direction and are alternately fastened to the inner wall of the housing 1 and the outer lateral surface of the insulating nozzle 9.
  • the deflection plates 13 have free ends and thus delimit a meandering flow channel for heated extinguishing gas, which is guided from the cavity 7 via the channels 8 and an annular partial space 14 of the pressure accumulator 10 into a further annular partial space 15 of the pressure accumulator 10 during the heating process.
  • the sub-space 15 is essentially delimited by the housing 1, the insulating nozzle 9, an essentially radially extending housing extension 16 which is penetrated by the switching element 3 in an opening (not designated) in a gas-tight manner and the switching element 3.
  • the sub-space 15 is connected when switched off to an arc chamber 18 located between the free ends of the separating switching elements 2 and 3, adjoining the cavity 7 and receiving the switching arc 17, as soon as the switching piece 19 penetrating the constriction 19 of the insulating nozzle 9 essentially in a gas-tight manner 3 has released this bottleneck.
  • annular space 20 which, when switched off, is connected to the arc chamber 18 before the partial space 15.
  • the annular space 20 is part of a connecting path from the arc chamber 18 to an expansion space 21.
  • this connecting path also contains channels 22 which run in the axial direction and which - as can be seen from FIG. 1 - cross the channels 8. From Fig. 2 it can be seen that the channels 8 and 22 are arranged in radially or axially extending material recesses of the insulating nozzle 9.
  • the channels 8 and 22 are arranged in radially or axially extending material recesses of the insulating nozzle 9.
  • seen in the circumferential direction of the insulating nozzle 9 alternate radially and axially extending material recesses on each other. This has the effect that, when the insulating gas is switched off, flows through the arc chamber 18 in a particularly uniform manner.
  • the cavity 7 and the partial space 14 of the pressure accumulator 10 are at least partially provided with a material lining 23 which, compared to the material of the contact fingers 5 and 6 of the contact piece 2, has a comparatively low thermal conductivity, a low evaporation enthalpy and a low boiling point and, when exposed to arcing, forms a arc-quenching gas evaporates very easily.
  • These material linings 23 are arranged in such a way that the change in geometry caused by the occurrence of the switching arc 17 as a result of material evaporation does not have any significant influence on the flow behavior of the arc plasma from the cavity 7 into the pressure accumulator 10.
  • the material linings 23 preferably contain low-hydrogen or hydrogen-free polymers based on halogen-carbon with a fine-grained filler, such as carbon or metal sulfides. It is particularly recommended to produce the material linings 23 from polytetrafluoroethylene with fine-grained powder fillings of preferably 1-15 percent by weight zinc, 3-30 percent by weight molybdenum disulfide or 7-15 percent by weight graphite or coal.
  • the material lining located on the upper end face of the cavity 7 can - as can be seen in FIG. 1 - be designed as a pin 24.
  • the movable contact piece 3 is then hollow so that the pin 24 can penetrate into the contact piece 3 in the switched-on position.
  • the mode of operation of the compressed gas switch according to the invention is now as follows: when the switch 3 is switched off, it is moved downwards. As soon as the two switching pieces 2 and 3 separate, the switching arc 17 is drawn between their free ends (left half of FIG. 1). The heating power of this switching arc passes through the cavity 7, the channels 8 and through the open check valves 11 into the pressure accumulator 10 and there leads to a pressure build-up. At the same time, part of the heating power flows through the channels 22 into the expansion space 21.
  • the check valves 11 prevent a backflow of the gas in the pressure accumulator 10 through the channels 8 when the flow drops and the associated pressure drop in the cavity 7 occurs.
  • the material lining 23 additionally ensures that as little arc heat and thus heat output as possible is lost through heat dissipation to the inside of the contact fingers 5, and that material evaporates to a considerable extent from these linings under the influence of the hot plasma and the radiation from the switching arc 17. This is particularly advantageous when switching small currents, since it also increases the pressure of the extinguishing gas in the pressure accumulator 10.
  • a further effect of the material linings 23 can also be that an optionally desired one Commutation of the switching arc 17 from the contact fingers 5 and 6 of the contact piece 2 to a further contact, not shown in FIG. 1, is facilitated.
  • Such a contact can be connected in an electrically conductive manner to the power connection 4 and can be designed, for example, as a ring arranged in the region of the constriction 19 of the insulating nozzle 9. It is advantageous here if a material lining is provided in the form of the pin 24 and the movable contact piece 3 is hollow and in the switched-on position comprises the free end of the pin 24. In such a configuration of the gas pressure switch, a steam flow is generated when switching off shortly after the two switching pieces 2 and 3 are separated by the switching arc 17, which is directed from the contact fingers 5 and 6 to the further contact located in the constriction 19 of the insulating nozzle and thereby the Commutation of the switching arc 17 much easier.
  • the gas in the subspace 15 of the pressure accumulator 10 flows under pressure through the constriction 19 of the insulating nozzle 9 and constricts the switching arc 17 at the constriction 19 (right half of FIG. 1).
  • the switching arc 17 is inevitably widened considerably by the switching element 2 behind the constriction 19. This leads to a magnetic pressure gradient in the direction of the cavity 7.
  • the switching arc 17 therefore acts like a pump, which sucks cold gas out of the subspace 15 and conveys it as an arc plasma into the cavity 7 and thus via the channels 8 into the pressure accumulator 10 with increased pressure .
  • the flow labyrinth 12 prevents the hot gas fed from the arc zone via the cavity 7 and the channels 8 into the partial space 14 of the pressure accumulator 10 from mixing with the cold extinguishing gas displaced into the partial space 15. It is thereby achieved that the arc in the area of the constriction 19 is only blown out of the subspace 15 with cold quenching gas.

Landscapes

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

Description

Bei der Erfindung wird ausgegangen von einem Druckgasschalter nach dem Oberbegriff von Patentanspruch 1.The invention is based on a gas pressure switch according to the preamble of patent claim 1.

Mit diesem Oberbegriff nimmt die Erfindung auf einen Stand der Technik Bezug, wie er etwa in der DE-PS 28 11 508 beschrieben ist. Beim bekannten Schalter wird vom Schaltlichtbogen aufgeheiztes Löschgas in eine Druckkammer geführt, in der es unter hohem Druck stehend nach Freigabe einer Abströmöffnung in den Expansionsraum den Schaltlichtbogen bebläst. Damit ein solcher Schalter innerhalb eines weiten Bereichs von Stromstärken befriedigend arbeitet, ist es erforderlich, dass eine im wesentlichen aus einer rohrförmigen Verlängerung bestehende und mit dem beweglichen Schaltstück zusammenwirkende Einrichtung vorgesehen ist, welche das in der Druckkammer befindliche Löschgas verzögert in den Expansionsraum entweichen lässt, und dass ferner der äussere Teil der Druckkammer durch ein Ventil vor zu hohen Drücken geschützt wird.With this preamble, the invention relates to a prior art, as described for example in DE-PS 28 11 508. In the known switch, the quenching gas heated by the switching arc is guided into a pressure chamber in which it is blown under high pressure after the release of an outflow opening into the expansion space. In order for such a switch to work satisfactorily within a wide range of current intensities, it is necessary to provide a device consisting essentially of a tubular extension and interacting with the movable contact piece, which allows the extinguishing gas in the pressure chamber to escape into the expansion space with a delay. and that the outer part of the pressure chamber is also protected from excessive pressures by a valve.

Aus FR-A-2 385 214, insbesondere Fig. 10 und S. 8, Zeilen 10 - 30, ist ein weiterer gemäss dem Oberbegriff von Patentanspruch 1 ausgebildeter Druckgasschalter bekannt. Dieser Schalter weist einen feststehenden Kontakt mit einem zum Expansionsraum hin geöffneten, düsenförmig ausgebildeten Kanal auf. Durch diesen Kanal wird vom Schaltlichtbogen erzeugtes Fluid hoher Temperatur und hohen Druckes in den Expansionsraum geführt, um so ein übermässiges Ansteigen des Druckes in der Druckkammer zu vermeiden.From FR-A-2 385 214, in particular FIGS. 10 and 8, lines 10-30, a further pressure gas switch designed according to the preamble of claim 1 is known. This switch has a fixed contact with a channel-shaped channel open towards the expansion space. Fluid of high temperature and high pressure generated by the switching arc is led through this channel into the expansion space in order to avoid an excessive increase in the pressure in the pressure chamber.

Die Erfindung, wie sie in Anspruch 1 gekennzeichnet ist, löst die Aufgabe, einen Druckgasschalter der gattungsgemässen Art zu schaffen, bei dem mit einfachen Mitteln ein zu kleiner Druckaufbau bei kleinen und ein zu grosser Druckaufbau bei grossen Strömen vermieden wird.The invention, as characterized in claim 1, solves the problem of creating a pressure gas switch of the generic type, in which a pressure build-up that is too small for small and a pressure build-up that is too high is avoided with simple means.

Die Aufgabe wird in Verbindung mit den Merkmalen des Oberbegriffs gemäss dem kennzeichnenden Teil des Anspruchs 1 gelöst.The object is achieved in connection with the features of the preamble according to the characterizing part of claim 1.

Beim erfindungsgemässen Druckgasschalter wird der Schaltlichtbogen in der Hochstromphase durch geeignete Führung der Löschgasströmung stark eingeengt, um sodann in seinem stromabwärts gelegenen Bogenteil je nach Strom mehr oder weniger stark aufzuweiten. Hierbei wird durch das in Achsenrichtung strömende Bogengas im Druckspeicher ein Druck aufgebaut. Dadurch wird sichergestellt, dass beim Schalten kleiner Ströme ein grosser Anteil des Bogengases zum Druckaufbau zur Verfügung steht. Zusätzliche Massnahmen zur Verzögerung der Löschgasströmung sind daher entbehrlich. Bei grossen Strömen wird dagegen ein Teil des Bogengases in den Expansionsraum abgeführt. Dadurch ist es nicht mehr erforderlich, Vorkehrungen zu treffen, durch welche sichergestellt ist, dass der Druckspeicher beim Schalten von Kurzschlussströmen nicht mit einem zu hohen Druck beaufschlagt wird.In the compressed gas switch according to the invention, the switching arc is greatly restricted in the high current phase by suitable guiding of the quenching gas flow, in order then to widen more or less strongly in its downstream arc part depending on the current. A pressure is built up in the pressure accumulator by the arc gas flowing in the axial direction. This ensures that when switching small currents, a large proportion of the arc gas is available to build up pressure. Additional measures to delay the flow of extinguishing gas are therefore unnecessary. In the case of large flows, on the other hand, part of the arc gas is discharged into the expansion space. As a result, it is no longer necessary to take precautions to ensure that the pressure accumulator is not subjected to excessive pressure when switching short-circuit currents.

Weitere Eigenschaften und Vorteile der Erfindung werden nachfolgend anhand eines in der Zeichnung dargestellten und die Erfindung nicht beschränkenden Ausführungsbeispiels näher erläutert.Further properties and advantages of the invention are explained in more detail below with reference to an exemplary embodiment shown in the drawing and not restricting the invention.

Hierbei zeigt:

Fig. 1
eine Aufsicht auf eine axial geschnittene Ausführungsform des erfindungsgemässen Druckgasschalters, wobei in der linken Hälfte der Zustand kurz nach der Trennung der Schaltstücke und in der rechten Hälfte der Zustand bei der Beblasung des Schaltlichtbogens dargestellt sind, und
Fig. 2
eine Aufsicht auf einen Schnitt längs II-II durch den Druckgasschalter gemäss Fig. 1.
Here shows:
Fig. 1
2 shows a top view of an axially cut embodiment of the compressed gas switch according to the invention, the state shortly after the switching pieces have been separated and the state when the switching arc is blown in the left half, and
Fig. 2
a plan view of a section along II-II through the pressure gas switch according to FIG. 1.

In Fig. 1 bezeichnet 1 ein im wesentlichen hohlzylindrisch ausgebildetes Gehäuse aus Isolierstoff. Dieses Gehäuse befindet sich in einer Atmosphäre von Isoliergas, wie etwa Schwefelhexafluorid von einigen bar Druck. Es enthält zwei längs einer Achse relativ zueinander bewegliche Schaltstücke 2 und 3. Das Schaltstück 2 ist auf einem Stromanschluss 4 abgestützt und enthält einen Kranz von Kontaktfingern 5 und 6, welche im Schaltstück 2 einen Hohlraum 7 begrenzen. Das Schaltstück 3 ist vollzylindrisch und längs der Zylinderachse beweglich ausgebildet. In der Einschaltstellung des Schalters ist es in den Hohlraum 7 eingefahren und kontaktiert mit seiner Aussenfläche die Innenflächen der Kontaktfinger 5 und 6. Die Kontaktfinger 6 sind an ihren vom freien Ende des Schaltstückes 2 abgewandten Enden etwas länger als die Kontaktfinger 5 und sparen hierdurch im Schaltstück 2 Kanäle 8 aus, die sich in radialer Richtung durch eine vorzugsweise aus Polytetrafluoräthylen (PTFE) bestehende Isolierdüse 9 in einen die Schaltstücke 2, 3 koaxial umgebenden, ringförmig ausgebildeten Druckspeicher 10 erstrecken. An den Mündungen der Kanäle 8 in den Druckspeicher 10 befinden sich Rückschlagventile 11, welche bei einer Druckabsenkung im Hohlraum 7 den Druckspeicher 10 gegenüber dem Hohlraum 7 verschliessen.In Fig. 1, 1 denotes an essentially hollow cylindrical housing made of insulating material. This housing is in an atmosphere of insulating gas, such as sulfur hexafluoride at a few bar pressure. It contains two contact pieces 2 and 3 which are movable relative to one another along an axis. The contact piece 2 is supported on a power connection 4 and contains a ring of contact fingers 5 and 6 which delimit a cavity 7 in the contact piece 2. The switching piece 3 is fully cylindrical and movable along the cylinder axis. In the switched-on position of the switch, it is retracted into the cavity 7 and contacts the inner surfaces of the contact fingers 5 and 6 with its outer surface. The contact fingers 6 are somewhat longer at their ends facing away from the free end of the switching element 2 than the contact fingers 5 and thereby save in the switching element 2 channels 8, which extend in the radial direction through an insulating nozzle 9, preferably made of polytetrafluoroethylene (PTFE), into a ring-shaped pressure accumulator 10, which coaxially surrounds the switching elements 2, 3. At the mouths of the channels 8 in the pressure accumulator 10 there are check valves 11 which close the pressure accumulator 10 with respect to the cavity 7 when the pressure in the cavity 7 drops.

Der Druckspeicher 10 ist im wesentlichen vom Gehäuse 1 und der äusseren Mantelfläche der Isolierduse 9 begrenzt und durch ein Strömungslabyrinth 12 unterteilt. Dieses kann z.B. aus radialen ringförmigen Umlenkplatten 13 bestehen, die in axialer Richtung gegeneinander mit Abstand versetzt und abwechselnd an der Innenwand des Gehäuses 1 und der äusseren Mantelfläche der Isolierdüse 9 befestigt sind. Die Umlenkplatten 13 weisen freie Enden auf und begrenzen so einen mäanderförmig verlaufenden Strömungskanal für aufgeheiztes Löschgas, das während des Aufheizvorgangs vom Hohlraum 7 über die Kanäle 8 und einen ringförmigen Teilraum 14 des Druckspeichers 10 in einen weiteren ringförmigen Teilraum 15 des Druckspeichers 10 geführt wird. Der Teilraum 15 ist im wesentlichen vom Gehäuse 1, der Isolierdüse 9, einem vom Schaltstück 3 in einer nicht bezeichneten Oeffnung in gasdichter Weise durchsetzten und im wesentlichen radial erstreckten Gehäuseansatz 16 sowie dem Schaltstück 3 begrenzt. Der Teilraum 15 wird beim Ausschalten mit einer zwischen den freien Enden der sich trennenden Schaltstücke 2 und 3 befindlichen, an den Hohlraum 7 anschliessenden und den Schaltlichtbogen 17 aufnehmenden Lichtbogenkammer 18 verbunden, sobald das die Engstelle 19 der Isolierdüse 9 im wesentlichen in gasdichter Weise durchdringende Schaltstück 3 diese Engstelle freigegeben hat.The pressure accumulator 10 is essentially delimited by the housing 1 and the outer lateral surface of the insulating nozzle 9 and divided by a flow labyrinth 12. This can consist, for example, of radial annular deflection plates 13 which are offset from one another in the axial direction and are alternately fastened to the inner wall of the housing 1 and the outer lateral surface of the insulating nozzle 9. The deflection plates 13 have free ends and thus delimit a meandering flow channel for heated extinguishing gas, which is guided from the cavity 7 via the channels 8 and an annular partial space 14 of the pressure accumulator 10 into a further annular partial space 15 of the pressure accumulator 10 during the heating process. The sub-space 15 is essentially delimited by the housing 1, the insulating nozzle 9, an essentially radially extending housing extension 16 which is penetrated by the switching element 3 in an opening (not designated) in a gas-tight manner and the switching element 3. The sub-space 15 is connected when switched off to an arc chamber 18 located between the free ends of the separating switching elements 2 and 3, adjoining the cavity 7 and receiving the switching arc 17, as soon as the switching piece 19 penetrating the constriction 19 of the insulating nozzle 9 essentially in a gas-tight manner 3 has released this bottleneck.

Zwischen Engstelle 19 der Isolierdüse 9 und freiem Ende des feststehenden Schaltstücks 3 befindet sich ein Ringraum 20, welcher beim Ausschalten schon vor dem Teilraum 15 mit der Lichtbogenkammer 18 verbunden ist. Der Ringraum 20 ist Teil eines Verbindungsweges von der Lichtbogenkammer 18 zu einem Expansionsraum 21. Dieser Verbindungsweg enthält neben dem Ringraum 20 auch in axialer Richtung geführte Kanäle 22, welche - wie aus Fig. 1 ersichtlich ist - die Kanäle 8 überkreuzen. Aus Fig. 2 kann entnommen werden, dass die Kanäle 8 bzw. 22 in radial bzw. axial verlaufenden Materialausnehmungen der Isolierdüse 9 angeordnet sind. Hierbei folgen in Umfangsrichtung der Isolierdüse 9 gesehen abwechselnd radial und axial erstreckte Materialausnehmungen aufeinander. Dies bewirkt, dass beim Ausschalten aufgeheiztes Isoliergas in besonders gleichmässiger Weise durch die Lichtbogenkammer 18 strömt.Between the constriction 19 of the insulating nozzle 9 and the free end of the fixed contact piece 3 there is an annular space 20 which, when switched off, is connected to the arc chamber 18 before the partial space 15. The annular space 20 is part of a connecting path from the arc chamber 18 to an expansion space 21. In addition to the annular space 20, this connecting path also contains channels 22 which run in the axial direction and which - as can be seen from FIG. 1 - cross the channels 8. From Fig. 2 it can be seen that the channels 8 and 22 are arranged in radially or axially extending material recesses of the insulating nozzle 9. Here, seen in the circumferential direction of the insulating nozzle 9 alternate radially and axially extending material recesses on each other. This has the effect that, when the insulating gas is switched off, flows through the arc chamber 18 in a particularly uniform manner.

Der Hohlraum 7 und der Teilraum 14 des Druckspeichers 10 sind zumindest teilweise mit einer Materialauskleidung 23 versehen, welche gegenüber dem Material der Kontaktfinger 5 und 6 des Schaltstückes 2 eine vergleichsweise geringe Wärmeleitfähigkeit, eine geringe Verdampfungsenthalpie sowie einen niedrigen Siedepunkt aufweist und bei Lichtbogeneinwirkung unter Bildung eines lichtbogenlöschenden Gases sehr leicht abdampft. Diese Materialauskleidungen 23 sind hierbei derart angeordnet, dass die durch das Auftreten des Schaltlichtbogens 17 infolge von Materialabdampfung bedingte Geometrieänderung keinen wesentlichen Einfluss auf das Strömungsverhalten des Lichtbogenplasmas vom Hohlraum 7 in den Druckspeicher 10 ausübt.The cavity 7 and the partial space 14 of the pressure accumulator 10 are at least partially provided with a material lining 23 which, compared to the material of the contact fingers 5 and 6 of the contact piece 2, has a comparatively low thermal conductivity, a low evaporation enthalpy and a low boiling point and, when exposed to arcing, forms a arc-quenching gas evaporates very easily. These material linings 23 are arranged in such a way that the change in geometry caused by the occurrence of the switching arc 17 as a result of material evaporation does not have any significant influence on the flow behavior of the arc plasma from the cavity 7 into the pressure accumulator 10.

Die Materialauskleidungen 23 enthalten bevorzugt wasserstoffarme bzw. -freie Polymere auf der Basis Halogen-Kohlenstoff mit einem feinkörnigen Füllstoff, wie etwa Kohlenstoff oder Metallsulfide. Besonders zu empfehlen ist es, die Materialauskleidungen 23 aus Polytetrafluoräthylen mit feinkörnigen Pulverfüllungen von vorzugsweise 1 - 15 Gewichtsprozent Zink, 3 - 30 Gewichtsprozent Molybdändisulfid oder 7 - 15 Gewichtsprozent Graphit bzw. Kohle herzustellen.The material linings 23 preferably contain low-hydrogen or hydrogen-free polymers based on halogen-carbon with a fine-grained filler, such as carbon or metal sulfides. It is particularly recommended to produce the material linings 23 from polytetrafluoroethylene with fine-grained powder fillings of preferably 1-15 percent by weight zinc, 3-30 percent by weight molybdenum disulfide or 7-15 percent by weight graphite or coal.

Die an der oberen Stirnfläche des Hohlraumes 7 befindliche Materialauskleidung kann - wie Fig. 1 zu entnehmen ist - als Zapfen 24 ausgebildet sein. Das bewegliche Schaltstück 3 ist dann hohl auszubilden, damit in der Einschaltstellung der Zapfen 24 in das Schaltstück 3 eindringen kann.The material lining located on the upper end face of the cavity 7 can - as can be seen in FIG. 1 - be designed as a pin 24. The movable contact piece 3 is then hollow so that the pin 24 can penetrate into the contact piece 3 in the switched-on position.

Die Wirkungsweise des erfindungsgemässen Druckgasschalters ist nun wie folgt: Beim Ausschalten wird das Schaltstück 3 nach unten bewegt. Sobald sich die beiden Schaltstücke 2 und 3 trennen, wird zwischen ihren freien Enden der Schaltlichtbogen 17 gezogen (linke Hälfte von Fig. 1). Die Heizleistung dieses Schaltlichtbogens gelangt über den Hohlraum 7, die Kanäle 8 und durch die offenen Rückschlagventile 11 in den Druckspeicher 10 und führt dort zu einem Druckaufbau. Zugleich strömt ein Teil der Heizleistung durch die Kanäle 22 in den Expansionsraum 21 ab.The mode of operation of the compressed gas switch according to the invention is now as follows: when the switch 3 is switched off, it is moved downwards. As soon as the two switching pieces 2 and 3 separate, the switching arc 17 is drawn between their free ends (left half of FIG. 1). The heating power of this switching arc passes through the cavity 7, the channels 8 and through the open check valves 11 into the pressure accumulator 10 and there leads to a pressure build-up. At the same time, part of the heating power flows through the channels 22 into the expansion space 21.

Mit zunehmendem Hub wird die Heizleistung des Schaltlichtbogens 7 vergrössert. Es gelangt daher trotz zunehmender Abströmung von Lichtbogenplasma in den Expansionsraum 21 nach wie vor ein erheblicher Teil des Lichtbogenplasmas in den Druckspeicher 10. Dieser Anteil ist umso grösser, je kleiner der Strom ist.With increasing stroke, the heating power of the switching arc 7 is increased. Despite the increasing outflow of arc plasma into the expansion space 21, a considerable part of the arc plasma still reaches the pressure accumulator 10. This proportion is greater the smaller the current.

Durch die Rückschlagventile 11 wird vermieden, dass bei Abfall des Stromes und dem damit verbundenen Druckabfall im Hohlraum 7 eine Rückströmung des im Druckspeicher 10 befindlichen Gases durch die Kanäle 8 eintritt.The check valves 11 prevent a backflow of the gas in the pressure accumulator 10 through the channels 8 when the flow drops and the associated pressure drop in the cavity 7 occurs.

Durch die Materialauskleidung 23 wird zusätzlich erreicht, dass möglichst wenig Bogenwärme und damit Heizleistung durch Wärmeableitung auf die Innenseite der Kontaktfinger 5 verloren geht, und dass unter dem Einfluss des heissen Plasmas und der Strahlung des Schaltlichtbogens 17 aus diesen Auskleidungen in erheblichem Masse Material abdampft. Dies ist vor allem beim Schalten kleiner Ströme von Vorteil, da hierdurch zusätzlich der Druck des im Druckspeicher 10 befindlichen Löschgases erhöht wird. Eine weitere Wirkung der Materialauskleidungen 23 kann aber auch darin bestehen, dass eine gegebenenfalls erwünschte Kommutierung des Schaltlichtbogens 17 von den Kontaktfingern 5 bzw. 6 des Schaltstückes 2 auf einen in der Figur 1 nicht dargestellten weiteren Kontakt erleichtert wird. Ein solcher Kontakt kann in elektrisch leitender Weise mit dem Stromanschluss 4 verbunden und beispielsweise als im Bereich der Engstelle 19 der Isolierdüse 9 angeordneter Ring ausgebildet sein. Hierbei ist es von Vorteil, wenn eine Materialauskleidung in Form des Zapfens 24 vorgesehen und das bewegliche Schaltstück 3 hohl ausgebildet ist und in der Einschaltposition das freie Ende des Zapfens 24 umfasst. Bei einer solchen Ausbildung des Druckgasschalters wird beim Ausschalten kurz nach dem Trennen der beiden Schaltstücke 2 und 3 durch den Schaltlichtbogen 17 ein Dampfstrom erzeugt, welcher von den Kontaktfingern 5 und 6 zu dem in der Engstelle 19 der Isolierdüse befindlichen weiteren Kontakt gerichtet ist und dadurch die Kommutierung des Schaltlichtbogens 17 wesentlich erleichtert.The material lining 23 additionally ensures that as little arc heat and thus heat output as possible is lost through heat dissipation to the inside of the contact fingers 5, and that material evaporates to a considerable extent from these linings under the influence of the hot plasma and the radiation from the switching arc 17. This is particularly advantageous when switching small currents, since it also increases the pressure of the extinguishing gas in the pressure accumulator 10. A further effect of the material linings 23 can also be that an optionally desired one Commutation of the switching arc 17 from the contact fingers 5 and 6 of the contact piece 2 to a further contact, not shown in FIG. 1, is facilitated. Such a contact can be connected in an electrically conductive manner to the power connection 4 and can be designed, for example, as a ring arranged in the region of the constriction 19 of the insulating nozzle 9. It is advantageous here if a material lining is provided in the form of the pin 24 and the movable contact piece 3 is hollow and in the switched-on position comprises the free end of the pin 24. In such a configuration of the gas pressure switch, a steam flow is generated when switching off shortly after the two switching pieces 2 and 3 are separated by the switching arc 17, which is directed from the contact fingers 5 and 6 to the further contact located in the constriction 19 of the insulating nozzle and thereby the Commutation of the switching arc 17 much easier.

Sobald das Schaltstück 3 die Engstelle 19 der Isolierdüse 9 freigibt, strömt das im Teilraum 15 des Druckspeichers 10 unter Ueberdruck stehende Gas durch die Engstelle 19 der Isolierdüse 9 und schnürt den Schaltlichtbogen 17 an der Engstelle 19 ein (rechte Hälfte der Fig. 1). Hierdurch wird nicht nur der Abbrand der Isolierdüse 9 reduziert, sondern zugleich erreicht, dass der Schaltlichtbogen 17 hinter der Engstelle 19 durch das Schaltstück 2 zwangsläufig beträchtlich aufgeweitet wird. Dies führt zu einem magnetischen Druckgradienten in Richtung des Hohlraumes 7. Der Schaltlichtbogen 17 wirkt daher wie eine Pumpe, welche Kaltgas aus dem Teilraum 15 absaugt und es als Lichtbogenplasma in den Hohlraum 7 und damit über die Kanäle 8 in den Druckspeicher 10 mit erhöhtem Druck zurückbefördert.As soon as the switching piece 3 releases the constriction 19 of the insulating nozzle 9, the gas in the subspace 15 of the pressure accumulator 10 flows under pressure through the constriction 19 of the insulating nozzle 9 and constricts the switching arc 17 at the constriction 19 (right half of FIG. 1). As a result, not only is the burn-off of the insulating nozzle 9 reduced, but at the same time it is achieved that the switching arc 17 is inevitably widened considerably by the switching element 2 behind the constriction 19. This leads to a magnetic pressure gradient in the direction of the cavity 7. The switching arc 17 therefore acts like a pump, which sucks cold gas out of the subspace 15 and conveys it as an arc plasma into the cavity 7 and thus via the channels 8 into the pressure accumulator 10 with increased pressure .

Das Strömungslabyrinth 12 verhindert, dass sich das aus der Bogenzone über den Hohlraum 7 und die Kanäle 8 in den Teilraum 14 des Druckspeichers 10 eingespeiste Heissgas mit dem in den Teilraum 15 verdrängten kalten Löschgas durchmischt. Dadurch wird erreicht, dass der Lichtbogen im Bereich der Engstelle 19 nur mit kaltem Löschgas aus dem Teilraum 15 beblasen wird.The flow labyrinth 12 prevents the hot gas fed from the arc zone via the cavity 7 and the channels 8 into the partial space 14 of the pressure accumulator 10 from mixing with the cold extinguishing gas displaced into the partial space 15. It is thereby achieved that the arc in the area of the constriction 19 is only blown out of the subspace 15 with cold quenching gas.

Durch den vor stehend beschriebenen Mechanismus wird somit erreicht, dass im Druckspeicher 10 auch beim Schalten kleiner Ströme Ueberdruck aufrechterhalten wird, dass der Lichtbogenkammer 18 kühles und unverschmutztes Löschgas zugeführt wird, und dass beim Abschalten grosser Ströme der Druckaufbau im Druckspeicher 10 durch Abblasen des in der Lichtbogenkammer 18 befindlichen überschüssigen Bogengases über den Ringraum 20 und die Kanäle 22 in den Expansionsraum 21 begrenzt wird.By the mechanism described above, it is thus achieved that overpressure is maintained in the pressure accumulator 10 even when switching small currents, that cool and unpolluted extinguishing gas is supplied to the arc chamber 18, and that when large currents are switched off, the pressure build-up in the pressure accumulator 10 by blowing off the pressure in the Arc chamber 18 located excess arc gas is limited via the annular space 20 and the channels 22 in the expansion space 21.

Claims (10)

  1. Gas-blast switch having two interacting switch pieces (2, 3), of which a first (2) has a hollow space (7) which is filled in the switched-on position at least partially by a second (3) of the two switch pieces, having a pressure reservoir (10) which encircles the switch pieces (2, 3) and is connected to the hollow space (7), and having an arc chamber (18) which adjoins the hollow space (7), is at least partially limited on its outer side by an insulating body which is constructed as an insulating nozzle (9), and, during switching-off, can be connected by a second (3) of the two switch pieces (2, 3) via a gas inlet to the pressure reservoir (10) and via a gas outlet to an expansion chamber (21), characterised in that the gas outlet is located between the narrow point (19) of the insulating nozzle (9) and the free end of the first switch piece (2) and, during switching-off, can be cleared by the second switch piece (3) before the gas entry.
  2. Gas-blast switch according to Claim 1, having first channels (8) connecting the hollow space (7) and the pressure reservoir (10) and having second channels (22) connecting the arc chamber (18) and the expansion chamber (21), characterised in that the first and second channels (8, 22) run crosswise.
  3. Gas-blast switch according to Claim 2, characterised in that non-return valves (11) are provided in the first channels (8), which non-return valves (11) are connected in such a way that, when there is a pressure drop in the hollow space (7), a return flow of quenching gas out of the pressure reservoir (10) is prevented.
  4. Gas-blast switch according to one of Claims 1 to 3, characterised in that a flow labyrinth (12) is provided in the pressure reservoir (10), which flow labyrinth (12) subdivides the pressure reservoir (10) into two subspaces (14, 15).
  5. Gas-blast switch according to Claim 4, characterised in that the flow labyrinth (12) is made of a material which is a good thermal conductor.
  6. Gas-blast switch according to one of Claims 1 to 5, characterised in that material linings (23) containing polymers based on halogenocarbon with a powdered filler material are provided in the hollow space (7) and/or in channels (8) from the hollow space (7) to a subspace (15) of the pressure reservoir (10).
  7. Gas-blast switch according to Claim 6, characterised in that the material linings (23) contain polytetrafluoroethylene with fine-grained powder fillings of preferably 1-15 per cent by weight of zinc, 3-30 per cent by weight of molybdenum disulphide or 7-15 per cent by weight of graphite or carbon.
  8. Gas-blast switch according to one of Claims 6 or 7, characterised in that the lining (23) is at least partially constructed as a pin (24) which extends in the axial direction into the hollow space (7) and, in the switch-on position of the gas-blast switch, is moved into the free end of the second switch piece (3).
  9. Gas-blast switch according to one of Claims 2 to 8, characterised in that the insulating nozzle (9) has material cutouts for accommodating the first and second channels (8, 22), of which the material cutouts accommodating the first channels (8) run essentially radially and the material cutouts accommodating the second channels (22) run essentially axially.
  10. Gas-blast switch according to Claim 9, characterised in that, as viewed in the peripheral direction of the insulating nozzle (9), a radially and an axially extending material cutout follow each other alternately.
EP85110187A 1984-10-10 1985-08-14 Pressurized-gas circuit breaker Expired - Lifetime EP0177714B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4864/84 1984-10-10
CH486484 1984-10-10

Publications (3)

Publication Number Publication Date
EP0177714A2 EP0177714A2 (en) 1986-04-16
EP0177714A3 EP0177714A3 (en) 1987-11-11
EP0177714B1 true EP0177714B1 (en) 1991-10-23

Family

ID=4283889

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110187A Expired - Lifetime EP0177714B1 (en) 1984-10-10 1985-08-14 Pressurized-gas circuit breaker

Country Status (8)

Country Link
US (1) US4684773A (en)
EP (1) EP0177714B1 (en)
JP (1) JPH081774B2 (en)
CN (1) CN85107522B (en)
DE (2) DE3440212A1 (en)
ES (1) ES8700495A1 (en)
IN (1) IN165779B (en)
ZA (1) ZA856654B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19645524A1 (en) * 1996-11-05 1998-05-07 Abb Research Ltd Circuit breaker
US6100492A (en) * 1998-04-14 2000-08-08 Asea Brown Boveri Ag Consumable switching arrangement
US6100489A (en) * 1998-04-14 2000-08-08 Asea Brown Boveri Ag Consumable switching arrangement
US6163001A (en) * 1998-04-14 2000-12-19 Abb Research Ltd. Puffer type circuit breaker with arcing chamber, auxiliary shunting contacts and exhaust structure with pressure relief valves
EP1796119A1 (en) 2005-12-06 2007-06-13 ABB Research Ltd Interrupting chamber for high-voltage switch with a heating chamber for extinguishing gas reception

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646960B1 (en) * 1989-05-11 1993-12-10 Gec Alsthom Sa SELF-BLOWING MEDIUM VOLTAGE CIRCUIT BREAKER
DE3915700C3 (en) * 1989-05-13 1997-06-19 Aeg Energietechnik Gmbh Compressed gas switch with evaporative cooling
DE9115905U1 (en) * 1991-12-21 1993-04-22 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De
DE9314779U1 (en) * 1993-09-24 1993-11-25 Siemens Ag High-voltage circuit breaker with a cooling device for cooling the extinguishing gas
US6111212A (en) * 1998-04-21 2000-08-29 Cooper Industries, Inc. Interrupt assembly for a primary circuit breaker
DE19928080C5 (en) * 1999-06-11 2006-11-16 Siemens Ag High voltage circuit breaker with a discharge channel
FR2869449B1 (en) * 2004-04-21 2008-02-29 Areva T & D Sa ELECTRIC CUTTING EQUIPMENT IN MEDIUM OR HIGH VOLTAGE.
DE502004004571D1 (en) * 2004-06-07 2007-09-20 Abb Technology Ag breakers
DE102004047260B4 (en) * 2004-09-24 2006-08-03 Siemens Ag Insulating housing with ventilation shaft
EP1675145A1 (en) * 2004-12-23 2006-06-28 ABB Technology AG High power circuit breaker with sealing against hot arcing gasses
EP2120244A1 (en) * 2008-05-15 2009-11-18 ABB Technology AG High voltage output switch
DE102009009451A1 (en) * 2009-02-13 2010-08-19 Siemens Aktiengesellschaft Switchgear assembly with a switching path
US9012800B2 (en) * 2010-02-04 2015-04-21 Mitsubishi Electric Corporation Gas circuit breaker
EP2455957B1 (en) * 2010-11-22 2014-03-26 ABB Research Ltd. Gas insulated circuit breaker
CN103730275A (en) * 2013-12-20 2014-04-16 吴江市东泰电力特种开关有限公司 Rotating contact arc extinguishing chamber
KR101763451B1 (en) 2014-04-09 2017-08-01 현대일렉트릭앤에너지시스템(주) Circuit breaker of gas insulation switchgear
CN104064418A (en) * 2014-04-25 2014-09-24 博耳(宜兴)电力成套有限公司 Circulating air arc-control device for small breaker
US10115548B2 (en) * 2015-01-07 2018-10-30 Mitsubishi Electric Corporation Gas circuit breaker
CN109559933A (en) * 2018-11-16 2019-04-02 吴长兰 High-voltage switch device
DE102019206807A1 (en) * 2019-05-10 2020-11-12 Siemens Aktiengesellschaft Medium voltage switch-disconnectors
DE102019213344A1 (en) * 2019-09-03 2021-03-04 Siemens Energy Global GmbH & Co. KG Subdivide a heating volume of a circuit breaker

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE647726C (en) * 1932-11-18 1937-07-10 Siemens Schuckertwerke Akt Ges Device for extinguishing alternating current arcs
JPS53117787A (en) * 1977-03-24 1978-10-14 Mitsubishi Electric Corp Switch
CA1098571A (en) * 1977-03-24 1981-03-31 Masami Kii Fluid-blast type circuit breaker comprising valve controlled pressure chamber
CH641592A5 (en) * 1977-03-24 1984-02-29 Mitsubishi Electric Corp ELECTRIC CIRCUIT BREAKER WITH ARM EXTINGUISHING CHAMBER.
CA1096914A (en) * 1977-03-24 1981-03-03 Masami Kii Circuit interrupter comprising plural arc-quenching fluid pressure chambers
JPS53117761A (en) * 1977-03-24 1978-10-14 Mitsubishi Electric Corp Switch
DE2811510C2 (en) * 1977-03-24 1983-03-24 Mitsubishi Denki K.K., Tokyo Electric pressure gas switch
JPS5856932B2 (en) * 1977-03-24 1983-12-17 三菱電機株式会社 switch
CH629332A5 (en) * 1977-03-24 1982-04-15 Mitsubishi Electric Corp ELECTRIC CIRCUIT BREAKER WITH ARC CHAMBER
GB1593994A (en) * 1978-05-18 1981-07-22 Aei Electric circuit breakers
CH649416A5 (en) * 1980-01-25 1985-05-15 Sprecher & Schuh Ag EXHAUST GAS SWITCH.
ATE8440T1 (en) * 1980-09-01 1984-07-15 Sprecher + Schuh Ag GAS SWITCH.
JPS5944738A (en) * 1982-09-07 1984-03-13 株式会社東芝 Switch
JPS59144726U (en) * 1983-03-15 1984-09-27 日新電機株式会社 Gas cutter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19645524A1 (en) * 1996-11-05 1998-05-07 Abb Research Ltd Circuit breaker
US6100492A (en) * 1998-04-14 2000-08-08 Asea Brown Boveri Ag Consumable switching arrangement
US6100489A (en) * 1998-04-14 2000-08-08 Asea Brown Boveri Ag Consumable switching arrangement
US6163001A (en) * 1998-04-14 2000-12-19 Abb Research Ltd. Puffer type circuit breaker with arcing chamber, auxiliary shunting contacts and exhaust structure with pressure relief valves
DE19816509B4 (en) * 1998-04-14 2006-08-10 Abb Schweiz Ag consumable
EP1796119A1 (en) 2005-12-06 2007-06-13 ABB Research Ltd Interrupting chamber for high-voltage switch with a heating chamber for extinguishing gas reception

Also Published As

Publication number Publication date
EP0177714A3 (en) 1987-11-11
US4684773A (en) 1987-08-04
CN85107522B (en) 1987-11-11
EP0177714A2 (en) 1986-04-16
JPS6191811A (en) 1986-05-09
JPH081774B2 (en) 1996-01-10
ES8700495A1 (en) 1986-10-16
CN85107522A (en) 1986-08-20
IN165779B (en) 1990-01-06
DE3440212A1 (en) 1986-04-17
ZA856654B (en) 1986-04-30
DE3584494D1 (en) 1991-11-28
ES547715A0 (en) 1986-10-16

Similar Documents

Publication Publication Date Title
EP0177714B1 (en) Pressurized-gas circuit breaker
EP0175954B1 (en) Compressed gas circuit breaker
DE2039240C3 (en) Compressed gas switch with a device for generating a flow of extinguishing gas
EP0951039B1 (en) Power switch
EP2126947B1 (en) Gas blast circuit breaker with a radial flow opening
WO2009049669A1 (en) Gas-insulated high-voltage circuit breaker with a relief duct which is controlled by an overflow valve
EP3469618B1 (en) Interrupter unit for a circuit breaker
DE19837945A1 (en) Circuit arrangement and method for its manufacture
EP1403891A1 (en) Circuit breaker
EP0126929B2 (en) Pressurised-gas switch
DE2812945C2 (en) Gas switch
DE3107525C2 (en) Pressurized gas circuit breaker
EP0766278A2 (en) Circuit breaker
EP2316122B1 (en) High-voltage power switch with a switch gap
DE2811508C2 (en) Electric pressure gas switch
EP0743665B1 (en) Circuit breaker
DE1298598B (en) Vacuum switch
EP0290950B1 (en) Pressurized-gas circuit breaker
DE3341930A1 (en) EXHAUST GAS SWITCH
CH618287A5 (en) Gas-blast circuit breaker
EP0817228B1 (en) Power switch
EP0069819B1 (en) Gas blast circuit breaker
EP0042456A1 (en) High voltage power circuit breaker
EP0456139B1 (en) Compression switch
DE3315622A1 (en) EXHAUST GAS SWITCH

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): CH DE FR GB IT LI SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BBC BROWN BOVERI AG

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE FR GB IT LI SE

17P Request for examination filed

Effective date: 19880418

17Q First examination report despatched

Effective date: 19900618

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI SE

ITF It: translation for a ep patent filed

Owner name: DE DOMINICIS & MAYER S.R.L.

REF Corresponds to:

Ref document number: 3584494

Country of ref document: DE

Date of ref document: 19911128

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
EAL Se: european patent in force in sweden

Ref document number: 85110187.3

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19980713

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19980720

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19980722

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19980727

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19980803

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990814

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19990815

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990831

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19990814

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000428

EUG Se: european patent has lapsed

Ref document number: 85110187.3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000601

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST