EP0194489B1 - Gas blast circuit breaker - Google Patents

Gas blast circuit breaker Download PDF

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Publication number
EP0194489B1
EP0194489B1 EP86102307A EP86102307A EP0194489B1 EP 0194489 B1 EP0194489 B1 EP 0194489B1 EP 86102307 A EP86102307 A EP 86102307A EP 86102307 A EP86102307 A EP 86102307A EP 0194489 B1 EP0194489 B1 EP 0194489B1
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EP
European Patent Office
Prior art keywords
contact
moving
crank
rated
driving
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
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EP86102307A
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German (de)
French (fr)
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EP0194489A3 (en
EP0194489A2 (en
Inventor
Jürg Ischi
Andreas Dr. Plessl
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Application filed by BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0194489A2 publication Critical patent/EP0194489A2/en
Publication of EP0194489A3 publication Critical patent/EP0194489A3/en
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Publication of EP0194489B1 publication Critical patent/EP0194489B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
    • 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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts

Definitions

  • the invention is based on a gas pressure switch according to the first part of patent claim 1.
  • Such a switch has been proposed in EP-A-0 173 804.
  • This switch has an insulating gas-filled housing, in which two switching elements which are movable along an axis relative to one another and each have an erosion contact and a rated current contact are arranged.
  • the overall length which extends in the direction of movement of the switching pieces, is kept small by providing power connections which run into the housing transversely to this direction of movement and form loops in the interior of the housing.
  • this switch requires a comparatively large drive energy when it is switched off, since the rated current and the erosion contacts are moved simultaneously.
  • the invention solves the problem of specifying a gas pressure switch of the generic type, in which a comparatively weak drive can be used despite a high switching capacity and a compact design.
  • the pressure gas switch according to the invention is characterized essentially by the fact that the suitable arrangement and design of its contacts and its drive, when it is switched off, actuates its rated current contacts and its erosion contacts in a staggered manner, thus reducing the drive energy.
  • FIG. 1 denotes a housing made of insulating material, which is filled with an insulating gas, such as sulfur hexafluoride at a pressure of 4 to 6 bar, and is sealed off by a grounded metal cover 2.
  • an insulating gas such as sulfur hexafluoride at a pressure of 4 to 6 bar
  • bushings 3 and 4 are provided, through which a common power connection 5 or 6 for a movable nominal current contact 7 and a movable erosion contact 8 or a fixed nominal current contact 9 and a fixed erosion contact 10 into the interior of the housing 1 are performed.
  • the power connection 5 is via a rotary contact 11 formed, for example, from lamellae with the movable nominal current contact 7, which is rotatably mounted in the power connection 5, and via a likewise, for example, from lamellae formed sliding contact 12 connected to the burnable along an axis 13 burn contact 8 in an electrically conductive manner.
  • the fixed nominal current contact 9 is attached to the power connection 6.
  • the power connection 6 is also guided into a switching chamber 14 and connected in an electrically conductive manner to the fixed erosion contact 10 located in this switching chamber.
  • the power connection 5 is manufactured together with the bearing points for the rotary contact 11 and the movable erosion contact 8 from a single copper compact.
  • the power connection 6 is also made from a single copper compact.
  • a drive lever 16 is fastened to which two insulating rods 17 and 18 of approximately the same size are articulated.
  • the insulating rod 17 is articulated on the end of the movable erosion contact 8 facing away from the fixed erosion contact 10, whereas the insulating material rod 18 is articulated in the part of the movable nominal current contact 7 facing the fixed nominal current contact 9.
  • the movable nominal current contact 7 is formed by a double knife, which consists of two parallel and curved knife contacts.
  • the blade contacts are held at a distance from one another at the rotary contact 11 and at the pivot point 19 and are in the switched-on position, the insulating material wall of the switching chamber 14 engages behind the fixed nominal current contact 9. Between the two knife contacts there is sufficient space for the current connection 5 carrying the knife contacts and for an unimpeded movement of both insulating rods 17 and 18, which are also arranged between the two knife contacts.
  • a drive crank 20 formed from the drive shaft 15 and the drive lever 16 forms, together with the insulating rod 17 and the erosion contact 8 which can be displaced in the direction of the axis 13, a push crank which is located on a dash-dotted straight line in a dead center 21.
  • a crank rocker is formed from the drive crank 20, the insulating rod 18 and the rotatable nominal current contact 7, which is located on a further dash-dotted straight line in a dead center 22.
  • the drive crank 20 When the compressed gas switch according to the invention is switched off, the drive crank 20 is rotated counterclockwise by a drive (not shown). If the insulating rods 17 and 18 are now articulated on the drive crank 20 such that in the switched-on state the thrust crank acting on the movable erosion contact 8 is rotated by an angle of approximately 10 to 30 ° beyond the dead center 21, and that on the movable nominal current contact 7 Acting crank arm is essentially in the dead position 22, the movable erosion contact 8 moved into the fixed erosion contact 10 in the switched-on state will change its position only insignificantly as long as the drive crank 20 only reaches the position shown in FIG and the drive shaft 15 moreover at a comparatively small distance from the axis compared to the lengths of the insulating rods 17, 18 13 is mounted in the bulge of the metal cover 2.
  • crank arm which is in the dead center position 22 in the switched-on state, has already moved the movable nominal current contact 7 in the direction of the arrow by the time indicated in FIG. 2 so that the nominal current contacts 7 and 9 begin to separate and the one to be disconnected from the power connection 5 via the rotary contact 11, the movable nominal current contact 7, the fixed nominal current contact 9 to the current connection 6 commutates the current flowing from the current connection 5, the sliding contact 12, the movable erosion contact 8, the fixed erosion contact 10 and the current connection 6.
  • the erosion contacts 8, 10 When the drive crank 20 is turned further counterclockwise, the erosion contacts 8, 10 then open and an arc is drawn between the erosion contacts 8, 10, which is subsequently blown with insulating gas.
  • a major advantage of the pressure gas switch described above is that due to the suitable arrangement and design of its contacts and its drive when switched off, the actuation of its rated current and its erosion contacts is staggered over time, a reduction in the immersion depth of the movable erosion contact 8 in the fixed erosion contact 10 and thus a considerable saving in drive energy is achieved. At the same time, the stroke of the movable erosion contact 8 is considerably reduced, since a considerable movement of this contact in the switch-off direction can only take place after the nominal current contacts 7, 9 have been opened. For this reason and since the movable nominal current contact 7, which is designed as a curved double knife, engages behind the switching chamber 14, the pressure gas switch according to the invention is extremely compact and space-saving.
  • the curved shape of the movable nominal current contact 7 not only saves space because of the reduction in its predetermined distance from the grounded metal cover 2 in the switched-off state, but at the same time ensures that this contact can be reliably moved in and out of the fixed nominal current contact 9. Since the movable nominal current contact 7 is moved towards or away from the fixed nominal current contact 9 in the direction of flow of the current to be switched, disturbing transverse forces and tilting moments are eliminated on the movable nominal current contact 7. It is also advantageous that the Nominal current contacts 7, 9 are retracted deeply into one another in the switched-on state, as a result of which good contact is made possible. Since this retraction is also essentially in a dead position of the drive, tolerance problems are eliminated.

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  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Description

Bei der Erfindung wird ausgegangen von einem Druckgasschalter nach dem ersten Teil des Patentanspruchs 1.The invention is based on a gas pressure switch according to the first part of patent claim 1.

Ein derartiger Schalter ist in der EP-A-0 173 804 vorgeschlagen worden. Dieser Schalter weist ein isoliergasgefülltes Gehäuse auf, in welchem zwei längs einer Achse relativ zueinander bewegliche und jeweils einen Abbrand- und einen Nennstromkontakt aufweisende Schaltstücke angeordnet sind. Bei diesem Schalter wird die in Bewegungsrichtung der Schaltstücke erstreckte Baulänge dadurch gering gehalten, dass quer zu dieser Bewegungsrichtung ins Gehäuse geführte Stromanschlüsse vorgesehen sind, welche im Inneren des Gehäuses Schleifen bilden. Dieser Schalter benötigt beim Ausschalten jedoch eine vergleichsweise grosse Antriebsenergie, da Nennstrom- und Abbrandkontakte gleichzeitig bewegt werden.Such a switch has been proposed in EP-A-0 173 804. This switch has an insulating gas-filled housing, in which two switching elements which are movable along an axis relative to one another and each have an erosion contact and a rated current contact are arranged. With this switch, the overall length, which extends in the direction of movement of the switching pieces, is kept small by providing power connections which run into the housing transversely to this direction of movement and form loops in the interior of the housing. However, this switch requires a comparatively large drive energy when it is switched off, since the rated current and the erosion contacts are moved simultaneously.

Die Erfindung, wie sie im Anspruch 1 gekennzeichnet ist, löst die Aufgabe, einen Druckgasschalter der gattungsgemässen Art anzugeben, bei dem trotz einer hohen Schaltleistung und einer kompakten Bauweise ein vergleichsweise schwach dimensionierter Antrieb verwendet werden kann.The invention, as characterized in claim 1, solves the problem of specifying a gas pressure switch of the generic type, in which a comparatively weak drive can be used despite a high switching capacity and a compact design.

Der erfindungsgemässe Druckgasschalter zeichnet sich im wesentlichen dadurch aus, dass durch die geeignete Anordnung und Ausbildung seiner Kontakte und seines Antriebs beim Ausschalten seine Nennstrom- und seine Abbrandkontakte zeitlich gestaffelt betätigt werden und somit eine Verringerung der Antriebsenergie erreicht wird.The pressure gas switch according to the invention is characterized essentially by the fact that the suitable arrangement and design of its contacts and its drive, when it is switched off, actuates its rated current contacts and its erosion contacts in a staggered manner, thus reducing the drive energy.

Die Erfindung wird nachfolgende anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert.The invention is explained below with reference to an embodiment shown in the drawing.

Hierbei zeigt:

Fig. 1
eine Aufsicht auf einen erfindungsgemäss ausgeführten Druckgasschalter, dessen Gehäuse und dessen Schaltkammerwand in der Zeichenebene geschnitten dargestellt sind, in der Einschaltstellung und
Fig. 2
den in Fig. 1 dargestellten Druckgasschalter während des Ausschaltens.
Here shows:
Fig. 1
a top view of a pressure gas switch designed according to the invention, the housing and the switching chamber wall of which are shown cut in the plane of the drawing, in the switched-on position and
Fig. 2
the compressed gas switch shown in Fig. 1 during switching off.

In Fig. 1 bezeichnet 1 ein mit einem Isoliergas, wie etwa Schwefelhexafluorid von 4 bis 6 bar Druck, gefülltes und von einem geerdeten Metalldeckel 2 abgeschlossenes Gehäuse aus Isolierstoff. An einander gegenüberliegenden Seiten des Gehäuses 1 sind Durchführungen 3 bzw. 4 vorgesehen, durch welche jeweils ein gemeinsamer Stromanschluss 5 bzw. 6 für einen beweglichen Nennstromkontakt 7 und einen beweglichen Abbrandkontakt 8 bzw. einen feststehenden Nennstromkontakt 9 und einen feststehenden Abbrandkontakt 10 ins Innere des Gehäuses 1 geführt sind. Der Stromanschluss 5 ist über einen beispielsweise aus Lamellen gebildeten Drehkontakt 11 mit dem im Stromanschluss 5 drehbar gelagerten beweglichen Nennstromkontakt 7 und über einen beispielsweise ebenfalls aus Lamellen gebildeten Gleitkontakt 12 mit dem längs einer Achse 13 verschiebbaren Abbrandkontakt 8 in elektrisch leitender Weise verbunden. Am Stromanschluss 6 ist der feststehende Nennstromkontakt 9 angebracht. Der Stromanschluss 6 ist ferner in eine Schaltkammer 14 geführt und mit dem in dieser Schaltkammer befindlichen feststehenden Abbrandkontakt 10 in elektrisch leitender Weise verbunden.In FIG. 1, 1 denotes a housing made of insulating material, which is filled with an insulating gas, such as sulfur hexafluoride at a pressure of 4 to 6 bar, and is sealed off by a grounded metal cover 2. On opposite sides of the housing 1, bushings 3 and 4 are provided, through which a common power connection 5 or 6 for a movable nominal current contact 7 and a movable erosion contact 8 or a fixed nominal current contact 9 and a fixed erosion contact 10 into the interior of the housing 1 are performed. The power connection 5 is via a rotary contact 11 formed, for example, from lamellae with the movable nominal current contact 7, which is rotatably mounted in the power connection 5, and via a likewise, for example, from lamellae formed sliding contact 12 connected to the burnable along an axis 13 burn contact 8 in an electrically conductive manner. The fixed nominal current contact 9 is attached to the power connection 6. The power connection 6 is also guided into a switching chamber 14 and connected in an electrically conductive manner to the fixed erosion contact 10 located in this switching chamber.

Der Stromanschluss 5 ist zusammen mit den Lagerstellen für den Drehkontakt 11 und den beweglichen Abbrandkontakt 8 aus einem einzigen Kupfer-Pressling gefertigt. Entsprechend ist auch der Stromanschluss 6 aus einem einzigen Kupfer-Pressling gefertigt. Bei der Montage kann dann die aus zwei Isolierstoffschalen bestehende und im Isolierstoff Ausnehmungen zur Aufnahme der Schalterkontakte und einer vom Abbrandkontakt 8 durchsetzten Isolierstoffdüse aufweisende Schaltkammer 14 durch Verschrauben auf den beiden Stromanschlüssen 5 und 6 befestigt werden.The power connection 5 is manufactured together with the bearing points for the rotary contact 11 and the movable erosion contact 8 from a single copper compact. Correspondingly, the power connection 6 is also made from a single copper compact. During assembly, the two insulating shells and recesses in the insulating material for receiving the switch contacts and a switching chamber 14 with the insulating contact penetrated by the erosion contact 8 can then be fastened by screwing onto the two power connections 5 and 6.

An einer in einer Ausbuchtung des geerdeten Metalldeckels 2 drehbar gelagerten und senkrecht zur Achse 13 geführten Antriebswelle 15 ist ein Antriebshebel 16 befestigt, an welchem zwei etwa gleich grosse Isolierstoffstangen 17 bzw. 18 angelenkt sind. Die Isolierstoffstange 17 ist an dem vom feststehenden Abbrandkontakt 10 abgewandten Ende des beweglichen Abbrandkontaktes 8 angelenkt, wohingegen die Isolierstoffstange 18 in dem dem feststehenden Nennstromkontakt 9 zugewandten Teil des beweglichen Nennstromkontaktes 7 angelenkt ist.On a drive shaft 15 which is rotatably mounted in a bulge of the grounded metal cover 2 and is guided perpendicular to the axis 13, a drive lever 16 is fastened to which two insulating rods 17 and 18 of approximately the same size are articulated. The insulating rod 17 is articulated on the end of the movable erosion contact 8 facing away from the fixed erosion contact 10, whereas the insulating material rod 18 is articulated in the part of the movable nominal current contact 7 facing the fixed nominal current contact 9.

Der bewegliche Nennstromkontakt 7 ist von einem Doppelmesser gebildet, welche aus zwei parallel geführten und gekrümmt ausgebildeten Messerkontakten besteht. Die Messerkontakte sind beim Drehkontakt 11 und am Anlenkpunkt 19 mit Abstand voneinander gehalten und sind in der Einschaltstellung die Isolierstoffwand der Schaltkammer 14 hintergreifend in Eingriff mit dem feststehenden Nennstromkontakt 9. Zwischen beiden Messerkontakten ist ausreichend Platz für den die Messerkontakte tragenden Stromanschluss 5 sowie für einen ungehinderten Bewegungsablauf beider Isolierstoffstangen 17 und 18, welche ebenfalls zwischen beiden Messerkontakten angeordnet sind.The movable nominal current contact 7 is formed by a double knife, which consists of two parallel and curved knife contacts. The blade contacts are held at a distance from one another at the rotary contact 11 and at the pivot point 19 and are in the switched-on position, the insulating material wall of the switching chamber 14 engages behind the fixed nominal current contact 9. Between the two knife contacts there is sufficient space for the current connection 5 carrying the knife contacts and for an unimpeded movement of both insulating rods 17 and 18, which are also arranged between the two knife contacts.

Eine aus der Antriebswelle 15 und dem Antriebshebel 16 gebildete Antriebskurbel 20 bildet zusammen mit der Isolierstoffstange 17 und dem in Richtung der Achse 13 verschiebbaren Abbrandkontakt 8 eine Schubkurbel, welche sich auf einer strichpunktierten Geraden in einer Totlage 21 befindet. Aus der Antriebskurbel 20, der Isolierstoffstange 18 und dem drehbaren Nennstromkontakt 7 ist eine Kurbelschwinge gebildet, welche sich auf einer weiteren strichpunktierten Geraden in einer Totlage 22 befindet.A drive crank 20 formed from the drive shaft 15 and the drive lever 16 forms, together with the insulating rod 17 and the erosion contact 8 which can be displaced in the direction of the axis 13, a push crank which is located on a dash-dotted straight line in a dead center 21. A crank rocker is formed from the drive crank 20, the insulating rod 18 and the rotatable nominal current contact 7, which is located on a further dash-dotted straight line in a dead center 22.

Beim Ausschalten des erfindungsgemässen Druckgasschalters wird die Antriebskurbel 20 durch einen nicht dargestellten Antrieb entgegen dem Uhrzeigersinn gedreht. Sind die Isolierstangen 17 und 18 nun so an die Antriebskurbel 20 angelenkt, dass im Einschaltzustand die auf den beweglichen Abbrandkonakt 8 wirkende Schubkurbel um einen Winkel von ca. 10 bis 30° über die Totlage 21 hinaus gedreht ist, und die auf den beweglichen Nennstromkontakt 7 wirkende Kurbelschwinge sich im wesentlichen in der Totlage 22 befindet, so wird der im Einschaltzustand in den feststehenden Abbrandkontakt 10 eingefahrene bewegliche Abbrandkontakt 8 seine Position nur unwesentlich ändern, so lange die Antriebskurbel 20 lediglich über die Totlage 21 hinweg die in Fig. 2 angegebene Position erreicht und die Antriebswelle 15 darüber hinaus in einer gegenüber den Längen der Isolierstoffstangen 17, 18 vergleichsweise geringen Entfernung von der Achse 13 in der Ausbuchtung des Metalldeckels 2 gelagert ist. Die im Einschaltzustand in der Totpunktlage 22 befindliche Kurbelschwinge hat den beweglichen Nennstromkontakt 7 bis zu dem in Fig. 2 angegebenen Zeitpunkt bereits so weit in Pfeilrichtung bewegt, dass die Nennstromkontakte 7 und 9 sich zu trennen beginnen und der abzuschaltende vom Stromanschluss 5, über den Drehkontakt 11, den beweglichen Nennstromkontakt 7, den feststehenden Nennstromkontakt 9 zum Stromanschluss 6 fliessende Strom auf den vom Stromanschluss 5, den Gleitkontakt 12, den beweglichen Abbrandkontakt 8, den feststehenden Abbrandkontakt 10 und den Stromanschluss 6 gebildeten Strompfad kommutiert.When the compressed gas switch according to the invention is switched off, the drive crank 20 is rotated counterclockwise by a drive (not shown). If the insulating rods 17 and 18 are now articulated on the drive crank 20 such that in the switched-on state the thrust crank acting on the movable erosion contact 8 is rotated by an angle of approximately 10 to 30 ° beyond the dead center 21, and that on the movable nominal current contact 7 Acting crank arm is essentially in the dead position 22, the movable erosion contact 8 moved into the fixed erosion contact 10 in the switched-on state will change its position only insignificantly as long as the drive crank 20 only reaches the position shown in FIG and the drive shaft 15 moreover at a comparatively small distance from the axis compared to the lengths of the insulating rods 17, 18 13 is mounted in the bulge of the metal cover 2. The crank arm, which is in the dead center position 22 in the switched-on state, has already moved the movable nominal current contact 7 in the direction of the arrow by the time indicated in FIG. 2 so that the nominal current contacts 7 and 9 begin to separate and the one to be disconnected from the power connection 5 via the rotary contact 11, the movable nominal current contact 7, the fixed nominal current contact 9 to the current connection 6 commutates the current flowing from the current connection 5, the sliding contact 12, the movable erosion contact 8, the fixed erosion contact 10 and the current connection 6.

Bei weiterer Drehung der Antriebskurbel 20 im Gegenuhrzeigersinn öffnen dann auch die Abbrandkontakte 8, 10 und wird zwischen den Abbrandkontakten 8, 10 ein Lichtbogen gezogen, welcher nachfolgend mit Isoliergas beblasen wird.When the drive crank 20 is turned further counterclockwise, the erosion contacts 8, 10 then open and an arc is drawn between the erosion contacts 8, 10, which is subsequently blown with insulating gas.

Ein wesentlicher Vorteil des vorstehend beschriebenen Druckgasschalters besteht darin, dass durch die geeignete Anordnung und Ausbildung seiner Kontakte und seines Antriebs beim Ausschalten eine zeitliche Staffelung der Betätigung seiner Nennstrom- und seiner Abbrandkontakte, eine Verringerung der Eintauchtiefe des beweglichen Abbrandkontaktes 8 in den feststehenden Abbrandkontakt 10 und somit eine erhebliche Ersparnis an Antriebsenergie erreicht wird. Zugleich wird der Hub des beweglichen Abbrandkontaktes 8 erheblich verringert, da eine beachtliche Bewegung dieses Kontaktes in Ausschaltrichtung erst nach dem Oeffnen der Nennstromkontakte 7, 9 erfolgen kann. Aus diesem Grund und da zudem der als gekrümmtes Doppelmesser ausgebildete bewegliche Nennstromkontakt 7 die Schaltkammer 14 hintergreift, ist der erfindungsgemässe Druckgasschalter äusserst kompakt und raumsparend ausgebildet. Durch die gekrümmte Form des beweglichen Nennstromkontaktes 7 wird wegen der dadurch ermöglichten Verringerung seines vorgegebenen Abstandes zum geerdeten Metalldeckel 2 im Ausschaltzustand nicht nur Raum eingespart, sondern zugleich ein sicheres Ein- und Ausfahren dieses Kontaktes in und aus dem feststehenden Nennstromkontakt 9 erreicht. Da der bewegliche Nennstromkontakt 7 beim Ein- oder Ausfahren im wesentlichen in Flussrichtung des zu schaltenden Stromes auf den feststehenden Nennstromkontakt 9 zu- oder von diesem wegbewegt wird, entfallen störende Querkräfte und Kippmomente auf den beweglichen Nennstromkontakt 7. Von Vorteil ist es ferner, dass die Nennstromkontakte 7, 9 im Einschaltzustand tief ineinander eingefahren sind, wodurch eine gut Kontaktgabe ermöglicht wird. Da dieses Einfahren zudem im wesentlichen in einer Totlage des Antriebes beendet ist, entfallen Toleranzprobleme.A major advantage of the pressure gas switch described above is that due to the suitable arrangement and design of its contacts and its drive when switched off, the actuation of its rated current and its erosion contacts is staggered over time, a reduction in the immersion depth of the movable erosion contact 8 in the fixed erosion contact 10 and thus a considerable saving in drive energy is achieved. At the same time, the stroke of the movable erosion contact 8 is considerably reduced, since a considerable movement of this contact in the switch-off direction can only take place after the nominal current contacts 7, 9 have been opened. For this reason and since the movable nominal current contact 7, which is designed as a curved double knife, engages behind the switching chamber 14, the pressure gas switch according to the invention is extremely compact and space-saving. The curved shape of the movable nominal current contact 7 not only saves space because of the reduction in its predetermined distance from the grounded metal cover 2 in the switched-off state, but at the same time ensures that this contact can be reliably moved in and out of the fixed nominal current contact 9. Since the movable nominal current contact 7 is moved towards or away from the fixed nominal current contact 9 in the direction of flow of the current to be switched, disturbing transverse forces and tilting moments are eliminated on the movable nominal current contact 7. It is also advantageous that the Nominal current contacts 7, 9 are retracted deeply into one another in the switched-on state, as a result of which good contact is made possible. Since this retraction is also essentially in a dead position of the drive, tolerance problems are eliminated.

In Abänderung des vorstehend beschriebenen Ausführungsbeispiels ist es denkbar, die Antriebskurbel 20 statt mit einem Antriebshebel 16 mit zwei Antriebshebeln auszurüsten. Jede der beiden Isolierstoffstangen 17 und 18 kann dann an einem der beiden Antriebshebel der Antriebskurbel 20 angelenkt werden. Hierdurch ist es möglich, den Bewegungsablauf von beweglichem Nennstrom- und beweglichem Abbrandkontakt noch weiter zu entkoppeln.In a modification of the exemplary embodiment described above, it is conceivable to equip the drive crank 20 with two drive levers instead of one drive lever 16. Each of the two insulating rods 17 and 18 can then be articulated on one of the two drive levers of the drive crank 20. This makes it possible to further decouple the movement sequence of the movable nominal current contact and the movable erosion contact.

Claims (4)

  1. Gas-blast circuit breaker comprising
    (a) a housing (1) which is filled with insulating gas and extends along an axis (13),
    (b) two electric connections (5, 6) which are carried into the housing (1) essentially transversely with respect to the axis (13),
    (c) a switching chamber (14) which is arranged in the housing (1),
    (d) two arcing contacts (8, 10) which are located in the switching chamber (14) and are in each case connected to one of the electric connections (5, 6), one moving contact (8) of which arcing contacts is displaceable along the axis (13),
    (e) two rated-current contacts (7, 9) which are located in the housing (1) and are in each case connected to one of the electric connections (5, 6), and comprising
    (f) a drive (17, 18, 20) acting on the moving arcing (8) and the moving rated-current contact (7),
    characterised in
    (g) that the moving rated-current contact (7) is rotatably supported,
    (h) that the drive has two rods (17, 18) of insulating material which are pivoted at a drive crank (20) and a first (17) of which rods is pivoted at the moving arcing contact (8) and a second (18) of which is pivoted at the moving rated-current contact (7), and
    (i) that the two rods (17, 18) of insulating material are pivoted at the driving crank (20) in such a manner that, during the disconnecting process, a thrust crank formed by the driving crank (20), the first rod (17) of insulating material and the moving arcing contact (8) passes through a first dead-centre position (21) before reaching the disconnected condition, and a crank-rocker linkage formed by the driving crank (20), the second rod (18) of insulating material and the moving rated-current contact (7) is essentially located in a second dead-centre position (22) in the switched-on condition.
  2. Gas-blast circuit breaker according to Claim 1, characterised in that
    (j) the driving crank (20) has a driving lever (16) which is attached to a driving shaft (15), at which driving lever both rods (17, 18) of insulating material are jointly pivoted.
  3. Gas-blast circuit breaker according to Claim 1, characterised in that
    (k) the driving crank (20) has two driving levers which are attached to a driving shaft (15), at which driving levers in each case one of the two rods (17, 18) of insulating material are pivoted.
  4. Gas-blast circuit breaker according to one of Claims 1 to 3, characterised in that
    (l) the pivot point of the moving rated-current contact (7) is attached to a first one (5) of the two electric connections (5, 6) and the fixed rated-current contact (9) is attached to a second one (6) of the two electric connections (5, 6), and
    (m) that the moving rated-current contact (7) is constructed as a curved double blade which reaches behind the switching chamber (14).
EP86102307A 1985-03-12 1986-02-22 Gas blast circuit breaker Expired - Lifetime EP0194489B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1107/85 1985-03-12
CH110785 1985-03-12

Publications (3)

Publication Number Publication Date
EP0194489A2 EP0194489A2 (en) 1986-09-17
EP0194489A3 EP0194489A3 (en) 1989-03-15
EP0194489B1 true EP0194489B1 (en) 1991-05-08

Family

ID=4202657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102307A Expired - Lifetime EP0194489B1 (en) 1985-03-12 1986-02-22 Gas blast circuit breaker

Country Status (6)

Country Link
US (1) US4675484A (en)
EP (1) EP0194489B1 (en)
JP (1) JP2573178B2 (en)
DE (2) DE3513264A1 (en)
ES (1) ES8707017A1 (en)
IN (1) IN167671B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3702195A1 (en) * 1987-01-26 1988-08-04 Bbc Brown Boveri & Cie Drive for an electrical switching apparatus
KR0167544B1 (en) * 1988-11-28 1999-01-15 미다 가쓰시게 Switch apparatus
SE467431B (en) * 1990-11-02 1992-07-13 Asea Brown Boveri HOEGSPAENNINGSBRYTARE
DE4427163A1 (en) * 1994-08-01 1996-02-08 Abb Management Ag Gas pressure switch
ES2630405T3 (en) * 2006-11-30 2017-08-21 Abb Schweiz Ag Gas insulated medium voltage disconnect switch

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480622A (en) * 1945-12-04 1949-08-30 Gen Electric Electric switch
US3671696A (en) * 1970-11-16 1972-06-20 Allis Chalmers Mfg Co Vacuum interrupter shunted with mechanical switch
JPS5531713Y2 (en) * 1974-06-11 1980-07-29
DE2811508C2 (en) * 1977-03-24 1983-06-16 Mitsubishi Denki K.K., Tokyo Electric pressure gas switch
FR2441916A1 (en) * 1978-11-14 1980-06-13 Merlin Gerin SELF-BLOWING ELECTRIC CIRCUIT BREAKER EQUIPPED WITH A DEVICE WITH IMPROVED MAIN CONTACTS
FR2469334A1 (en) * 1979-11-14 1981-05-22 Enfance Adolescence Ste Lyonna Heavy block handling trolley - has platform tilted for transport after gripping block between pads on platform and on gripping arm
GB2103018B (en) * 1981-07-02 1985-05-30 Int Standard Electric Corp Slide switch
JPS6191809A (en) * 1984-10-11 1986-05-09 三菱電機株式会社 Tank type switch

Also Published As

Publication number Publication date
JP2573178B2 (en) 1997-01-22
EP0194489A3 (en) 1989-03-15
DE3679089D1 (en) 1991-06-13
ES8707017A1 (en) 1987-07-01
IN167671B (en) 1990-12-08
JPS61208713A (en) 1986-09-17
EP0194489A2 (en) 1986-09-17
ES552893A0 (en) 1987-07-01
DE3513264A1 (en) 1986-09-18
US4675484A (en) 1987-06-23

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