EP0229918B1 - Drive for high-tension power circuit breaker - Google Patents

Drive for high-tension power circuit breaker Download PDF

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Publication number
EP0229918B1
EP0229918B1 EP86116001A EP86116001A EP0229918B1 EP 0229918 B1 EP0229918 B1 EP 0229918B1 EP 86116001 A EP86116001 A EP 86116001A EP 86116001 A EP86116001 A EP 86116001A EP 0229918 B1 EP0229918 B1 EP 0229918B1
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EP
European Patent Office
Prior art keywords
pressure
drive
compressed air
boiler
drive cylinder
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
EP86116001A
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German (de)
French (fr)
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EP0229918A1 (en
Inventor
Herbert Dr. Karrenbauer
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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication of EP0229918A1 publication Critical patent/EP0229918A1/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator

Definitions

  • the invention relates to a pneumatic or hydraulic drive for high-voltage circuit breakers with at least one drive cylinder for actuating one or more switching paths, a compressed air boiler or hydraulic accumulator being connected to the drive cylinder in a valve-controlled manner.
  • circuit breakers In order for a circuit breaker to achieve the required breaking capacity, a certain minimum pressure in the drive boiler is required to operate the drive, which pressure must not be fallen below. Circuit breakers are therefore electrically blocked when the pressure falls below this minimum. On the other hand, circuit breakers are required to be able to perform a sequence of opening and closing operations within a short time that is insufficient for refilling the fluid (e.g. compressed air or oil). In order to make this possible, the compressor or the hydraulic pump or the re-sluicing device for the compressed air boiler or the hydraulic accumulator is controlled in such a way that a substantially higher pressure than the aforementioned minimum pressure is maintained in the boiler for switching off.
  • the fluid e.g. compressed air or oil
  • This control pressure must be at least so high that the boiler pressure at the end of the required switching sequence does not fall below the minimum pressure required for switching off.
  • a certain amount of fluid is required for switching on and off. The removal of such an amount of fluid for a switch-on or switch-off causes a pressure drop in the boiler, which is greater the smaller the boiler volume is dimensioned. The difference between the boiler control pressure and the minimum pressure for switching off is therefore greater, the smaller the boiler is dimensioned.
  • the aim is to keep the boiler volume as low as possible.
  • this requires a correspondingly large difference between the control pressure of the boiler as the output pressure for the required switching sequence of the switch and the minimum pressure for switching off.
  • An SF ⁇ circuit breaker is known from the company brochure "AUTOPNEUMATIC high-performance switch” from AEG Aktiengesellschaft, page 14, figure 23, which is actuated by a compressed air drive, as described above.
  • the known compressed air drive has the disadvantage that a corresponding spreading of the drive pressure scale occurs with the reduction in the boiler volume, so that the damping of the on and off movement cannot be optimized for a specific on or off speed. With increasing spreading of the drive pressure scale, the speed range in which the damping of the switching movement has to work increases.
  • the object of the invention is to apply a drive pressure to the drive cylinder even in the case of a small boiler volume, which, despite switching operations in quick succession, does not have too great a difference.
  • the object is achieved in that one or more throttles controlled in dependence on the pressure of the compressed air boiler or hydraulic accumulator is arranged between the compressed air boiler or hydraulic accumulator and the drive cylinder such that the throttle cross section is fully open at minimum pressure in the compressed air boiler or hydraulic accumulator and that the throttle cross-section is reduced with increasing boiler pressure.
  • the invention has the advantage that the switching speeds remain approximately constant practically independent of the boiler pressure. As a result, the damping of the switching movements can be better optimized. In addition, a reduction in the boiler volume is possible despite the consequent widening of the boiler pressure scale. With the same performance, smaller and thus more economical systems can be built.
  • the optimal goal of pressure control is achieved if the pressure available for a drive unit remains constant as a difference between the boiler pressure and the pressure drop across the throttle, regardless of the boiler pressure.
  • the throttle cross section is fully opened at the minimum pressure in the compressed air boiler or hydraulic accumulator and it is reduced accordingly as the boiler pressure increases.
  • FIG. 1 shows an embodiment in which a throttle 7 is arranged immediately after the compressed air boiler 5.
  • a drive cylinder 1 is actuated by opening a switch-off valve 2 or a switch-on valve 3, so that the corresponding side of a drive piston 4 is pressurized.
  • the respective other valve must actuate a vent 12 assigned to it, so that the pressure difference driving the drive piston 4 occurs
  • the pressure in the compressed air boiler 5 is regulated by optionally re-sluicing depending on the pressure til 6 opens a supply line under higher pressure (P) or the pressure is supplemented by a compressor 9.
  • An adjustable throttle 7 is provided between the compressed air boiler 5 and the valves 2, 3. The throttle cross section is adjusted via an actuator 8 controlled by the pressure in the compressed air boiler 5 so that the pressure with which the drive cylinder 4 is acted remains approximately constant above the minimum pressure of the compressed air boiler 5.
  • the controllable throttle 7 can, as shown in FIG. 2, be arranged between the shut-off valve 2 and the drive cylinder 1.
  • the throttle 7 is arranged in a pressure-free space under normal operating conditions.
  • the throttle 7 as a component only has to have a short-term tightness to the outside, since the stress is limited to a pressure pulse during the switch-off process.
  • Another embodiment not shown, provides two throttles controlled by the boiler pressure, which are arranged between the shut-off valve 2 and the drive cylinder 1 and between the turn-on valve 3 and the drive cylinder 1.
  • Figure 3 shows an embodiment in which the pneumatic drive works on the differential piston principle. Switching on takes place by the 3/2-way valve 11 pressurizing the line 13. The differential piston 10 moves because of the different sized areas in the position drawn with solid lines of the switch-on position.
  • the adjustable throttle 7 is located as in FIG. 1 between the compressed air boiler 5 and the branching of the line, which then leads to the upper and lower ends of the drive cylinder 1.

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  • Fluid-Pressure Circuits (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Description

Die Erfindung betrifft einen pneumatischen bzw. hydraulischen Antrieb für Hochspannungs-Leistungsschalter mit mindestens einem Antriebszylinder zur Betätigung von einer oder mehreren Schaltstrecken, wobei ein Druckluftkessel bzw. Hydrospeicher ventilgesteuert mit dem Antriebszylinder verbunden ist.The invention relates to a pneumatic or hydraulic drive for high-voltage circuit breakers with at least one drive cylinder for actuating one or more switching paths, a compressed air boiler or hydraulic accumulator being connected to the drive cylinder in a valve-controlled manner.

Damit ein Leistungsschalter die erforderliche Ausschaltleistung erreicht, ist für die Betätigung des Antriebs ein bestimmter Mindestdruck im Antriebskessel erforderlich, der nicht unterschritten werden darf. Deshalb werden Leistungsschalter bei Unterschreitung dieses Mindestdruckes elektrisch gesperrt. Andererseits wird von Leistungsschaltern verlangt, daß sie eine Folge von Aus- und Einschaltungen innerhalb einer kurzen Zeit, die für ein Nachfüllen des Fluids (z. B. Druckluft oder ÖI) nicht ausreicht, ausführen können. Um dies zu ermöglichen, wird der Kompressor bzw. die Hydropumpe oder die Nachschleuseinrichtung für den Druckluftkessel bzw. den Hydrospeicher so gesteuert, daß ein wesentlich höherer Druck als der erwähnte Mindestdruck für eine Ausschaltung im Kessel aufrechterhalten wird. Dieser Regeldruck muß mindestens so hoch sein, daß der Kesseldruck am Ende der erforderlichen Schaltfolge den für eine Ausschaltung erforderlichen Mindestdruck nicht unterschreitet. Für eine Aus- bzw. Einschaltung wird eine bestimmte Menge Fluid benötigt. Die Entnahme einer solchen Fluidmenge für eine Ein- od. Ausschaltung bedingt einen Druckabfall im Kessel, der um so höher ist, je kleiner das Kesselvolumen bemessen ist. Der Unterschied zwischen dem Kesselregeldruck und dem Mindestdruck für eine Ausschaltung ist demzufolge um so größer, je kleiner der Kessel bemessen ist.In order for a circuit breaker to achieve the required breaking capacity, a certain minimum pressure in the drive boiler is required to operate the drive, which pressure must not be fallen below. Circuit breakers are therefore electrically blocked when the pressure falls below this minimum. On the other hand, circuit breakers are required to be able to perform a sequence of opening and closing operations within a short time that is insufficient for refilling the fluid (e.g. compressed air or oil). In order to make this possible, the compressor or the hydraulic pump or the re-sluicing device for the compressed air boiler or the hydraulic accumulator is controlled in such a way that a substantially higher pressure than the aforementioned minimum pressure is maintained in the boiler for switching off. This control pressure must be at least so high that the boiler pressure at the end of the required switching sequence does not fall below the minimum pressure required for switching off. A certain amount of fluid is required for switching on and off. The removal of such an amount of fluid for a switch-on or switch-off causes a pressure drop in the boiler, which is greater the smaller the boiler volume is dimensioned. The difference between the boiler control pressure and the minimum pressure for switching off is therefore greater, the smaller the boiler is dimensioned.

Aus wirtschaftlichen Gründen, wie auch aus Gründen der Schalterabmessungen wird angestrebt, das Kesselvolumen möglichst gering zu halten. Dies bedingt jedoch einen entsprechend großen Unterschied zwischen dem Regeldruck des Kessels als Ausgangsdruck für die erforderliche Schaltfolge des Schalters und dem Mindestdruck für eine Ausschaltung.For economic reasons, as well as for reasons of switch dimensions, the aim is to keep the boiler volume as low as possible. However, this requires a correspondingly large difference between the control pressure of the boiler as the output pressure for the required switching sequence of the switch and the minimum pressure for switching off.

Aus dem Firmen-Prospekt "Hochleistungsschalter AUTOPNEUMATIC" der Firma AEG Aktiengesellschaft, Seite 14, Bild 23, ist ein SFε-Leistungsschalter bekannt, der durch einen Druckluftantrieb, wie oben beschrieben, betätigt wird.An SFε circuit breaker is known from the company brochure "AUTOPNEUMATIC high-performance switch" from AEG Aktiengesellschaft, page 14, figure 23, which is actuated by a compressed air drive, as described above.

Aus der DE-B 1 665 981 ist ein Druckluftantrieb für einen elektrischen Schalter bekannt, bei dem der am Arbeitszylinder wirksame Druck über eine Drossel einstellbar ist.From DE-B 1 665 981 a compressed air drive for an electrical switch is known, in which the pressure acting on the working cylinder can be adjusted via a throttle.

Der bekannte Druckluftantrieb hat den Nachteil, daß mit der Verkleinerung des Kesselvolumens eine entsprechende Spreizung der Antriebsdruckskala auftritt, so daß die Dämpfung der Ein- und Ausschaltbewegung nicht für eine bestimmte Ein- bzw. Ausschaltgeschwindigkeit optimiert werden kann. Mit zunehmender Spreizung der Antriebsdruckskala nimmt der Geschwindigkeitsbereich zu, in dem die Dämpfung der Schaltbewegung arbeiten muß.The known compressed air drive has the disadvantage that a corresponding spreading of the drive pressure scale occurs with the reduction in the boiler volume, so that the damping of the on and off movement cannot be optimized for a specific on or off speed. With increasing spreading of the drive pressure scale, the speed range in which the damping of the switching movement has to work increases.

Der Erfindung liegt die Aufgabe zugrunde, auch bei kleinem Kesselvolumen den Antriebszylinder mit einem Antriebsdruck zu beaufschlagen, der trotz kurz aufeinanderfolgender Schaltvorgänge keine zu große Differenz aufweist.The object of the invention is to apply a drive pressure to the drive cylinder even in the case of a small boiler volume, which, despite switching operations in quick succession, does not have too great a difference.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß zwischen dem Druckluftkessel bzw. Hydrospeicher und dem Antriebszylinder eine oder mehrere in Abhängigkeit zu dem Druck des Druckluftkessels bzw. Hydrospeichers derart gesteuerte Drossel angeordnet ist, daß bei Mindestdruck im Druckluftkessel bzw. Hydrospeicher der Drosselquerschnitt voll geöffnet ist und daß der Drosselquerschnitt mit zunehmendem Kesseldruck verringert wird.The object is achieved in that one or more throttles controlled in dependence on the pressure of the compressed air boiler or hydraulic accumulator is arranged between the compressed air boiler or hydraulic accumulator and the drive cylinder such that the throttle cross section is fully open at minimum pressure in the compressed air boiler or hydraulic accumulator and that the throttle cross-section is reduced with increasing boiler pressure.

Durch die Erfindung ergibt sich der Vorteil, daß praktisch unabhängig vom Kesseldruck die Schaltgeschwindigkeiten näherungsweise konstant bleiben. Dadurch kann die Dämpfung der Schaltbewegungen besser optimiert werden. Außerdem ist eine Verkleinerung des Kesselvolumens trotz der daraus folgenden größeren Spreizung der Kesseldruckskala möglich. Bei gleicher Leistung können kleinere und damit wirtschaftlichere Anlagen gebaut werden.The invention has the advantage that the switching speeds remain approximately constant practically independent of the boiler pressure. As a result, the damping of the switching movements can be better optimized. In addition, a reduction in the boiler volume is possible despite the consequent widening of the boiler pressure scale. With the same performance, smaller and thus more economical systems can be built.

Weiterbildungen der Erfindung, die den Unteransprüchen zu entnehmen sind, ergeben günstige konstruktive Ausgestaltungen des Antriebs.Further developments of the invention, which can be found in the subclaims, result in favorable structural designs of the drive.

Das optimale Ziel der Druckregelung wird erreicht, wenn der für eine Antriebseinheit verfügbare Druck als Differenz von Kesseldruck und Druckabfall an der Drossel unabhängig vom Kesseldruck konstant bleibt.The optimal goal of pressure control is achieved if the pressure available for a drive unit remains constant as a difference between the boiler pressure and the pressure drop across the throttle, regardless of the boiler pressure.

Dazu wird bei Mindestdruck im Druckluftkessel bzw. Hydrospeicher der Drosselquerschnitt voll geöffnet und mit zunehmendem Kesseldruck wird er entsprechend verringert.For this purpose, the throttle cross section is fully opened at the minimum pressure in the compressed air boiler or hydraulic accumulator and it is reduced accordingly as the boiler pressure increases.

Aus Gründen wirtschaftlicher Ausgestaltung kann jedoch auch eine begrenzte Spreizung der Antriebsdruckskala zugelassen werden.For reasons of economic design, however, a limited spread of the drive pressure scale can also be permitted.

Die Erfindung wird nachstehend anhand von Ausführungsbeispielen für einen pneumatischen Antrieb erläutert, die zum Teil in den Zeichnungen dargestellt sind, wobei auf weitere Vorteile verwiesen wird. Es zeigen

  • Fig. 1 ein Ausführungsbeispiel,
  • Fig. 2 ein weiteres Ausführungsbeispiel mit anderer Anordnung der Drossel und
  • Fig. 3 ein Ausführungsbeispiel mit Differentialkolben.
The invention is explained below using exemplary embodiments for a pneumatic drive, some of which are illustrated in the drawings, reference being made to further advantages. Show it
  • 1 shows an embodiment,
  • Fig. 2 shows another embodiment with a different arrangement of the throttle and
  • Fig. 3 shows an embodiment with differential pistons.

Figur 1 zeigt ein Ausführungsbeispiel, bei dem eine Drossel 7 unmittelbar nach dem Druckluftkessel 5 angeordnet ist.Figure 1 shows an embodiment in which a throttle 7 is arranged immediately after the compressed air boiler 5.

Ein Antriebszylinder 1 wird betätigt, indem ein Ausschaltventil 2 bzw. ein Einschaltventil 3 geöffnet werden, so daß die entsprechende Seite eines Antriebskolbens 4 mit Druck beaufschlagt wird. Gleichzeitig muß das jeweils andere Ventil eine ihm zugeordnete Entlüftung 12 betätigen, damit die den Antriebskolben 4 antreibende Druckdifferenz zustande kommtA drive cylinder 1 is actuated by opening a switch-off valve 2 or a switch-on valve 3, so that the corresponding side of a drive piston 4 is pressurized. At the same time, the respective other valve must actuate a vent 12 assigned to it, so that the pressure difference driving the drive piston 4 occurs

Der Druck im Druckluftkessel 5 wird geregelt, indem wahlweise druckabhängig ein Nachschleusventil 6 eine unter höherem Druck (P) stehende Zufuhrleitung öffnet oder der Druck durch einen Kompressor 9 ergänzt wird. Zwischen dem Druckluftkessel 5 und den Ventilen 2, 3 ist eine regelbare Drossel 7 vorgesehen. Über ein vom Druck im Druckluftkessel 5 gesteuertes Stellglied 8 wird der Drosselquerschnitt so verstellt, daß der Druck, mit dem der Antriebszylinder 4 beaufschlagt wird, oberhalb des Mindestdrucks des Druckluftkessels 5 näherungsweise konstant bleibt.The pressure in the compressed air boiler 5 is regulated by optionally re-sluicing depending on the pressure til 6 opens a supply line under higher pressure (P) or the pressure is supplemented by a compressor 9. An adjustable throttle 7 is provided between the compressed air boiler 5 and the valves 2, 3. The throttle cross section is adjusted via an actuator 8 controlled by the pressure in the compressed air boiler 5 so that the pressure with which the drive cylinder 4 is acted remains approximately constant above the minimum pressure of the compressed air boiler 5.

Die regelbare Drossel 7 kann auch, wie in Fig. 2 dargestellt, zwischen dem Ausschaltventil 2 und dem Antriebszylinder 1 angeordnet werden. Bei dieser Ausgestaltung wird zwar nur der Antriebsdruck, der der Ausschaltung dient, geregelt; dafür wird die Drossel 7 in einem unter normalen Betriebsbedingungen drucklosen Raum angeordnet. Die Drossel 7 als Bauelement muß lediglich eine kurzzeitige Dichtigkeit nach außen aufweisen, da sich die Beanspruching auf einen Druckimpuls während des Ausschaltvorganges beschränkt.The controllable throttle 7 can, as shown in FIG. 2, be arranged between the shut-off valve 2 and the drive cylinder 1. In this embodiment, only the drive pressure that serves to switch it off is regulated; for this purpose, the throttle 7 is arranged in a pressure-free space under normal operating conditions. The throttle 7 as a component only has to have a short-term tightness to the outside, since the stress is limited to a pressure pulse during the switch-off process.

Eine weitere, nicht dargestellte Ausführung sieht zwei durch den Kesseldruck gesteuerte Drosseln vor, die zwischen dem Ausschaltventil 2 und dem Antriebszylinder 1 und zwischen dem Einschaltventil 3 und dem Antriebszylinder 1 angeordnet sind.Another embodiment, not shown, provides two throttles controlled by the boiler pressure, which are arranged between the shut-off valve 2 and the drive cylinder 1 and between the turn-on valve 3 and the drive cylinder 1.

Figur 3 zeigt eine Ausführung, bei der der pneumatische Antrieb nach dem Differentialkolbenprinzip arbeitet. Die Einschaltung erfolgt, indem das 3/2-Wege-Ventil 11 die Leitung 13 mit Druck beaufschlagt. Der Differentialkolben 10 bewegt sich wegen der verschieden großen Flächen in die mit durchgezogenen Linien gezeichnete Position der Einschaltstellung.Figure 3 shows an embodiment in which the pneumatic drive works on the differential piston principle. Switching on takes place by the 3/2-way valve 11 pressurizing the line 13. The differential piston 10 moves because of the different sized areas in the position drawn with solid lines of the switch-on position.

Die Ausschaltung erfolgt, indem das 3/2-WegeVentil 11 die Druckleitung sperrt und die Leitung 13 mit der Entlüftung 12 verbindet. Durch die Druckdifferenz bewegt sich der Differentialkolben 10 in die gestrichelt gezeichnete Position der Ausschaltstellung.It is switched off by the 3/2-way valve 11 blocking the pressure line and connecting the line 13 to the vent 12. Due to the pressure difference, the differential piston 10 moves into the dashed position of the switch-off position.

Bei dieser Ausführung befindet sich die regelbare Drossel 7 wie bei Fig. 1 zwischen dem Druckluftkessel 5 und der Verzweigung der Leitung, die dann an das obere und das untere Ende des Antriebszylinders 1 führt.In this embodiment, the adjustable throttle 7 is located as in FIG. 1 between the compressed air boiler 5 and the branching of the line, which then leads to the upper and lower ends of the drive cylinder 1.

Der Vorteil dieser Ausführung besteht darin, daß nur ein Ventil erforderlich ist.The advantage of this design is that only one valve is required.

Claims (4)

1. Pneumatic or hydraulic drive for high-voltage circuit breakers with at least one drive cylinder for actuation of one or more switching paths, wherein a compressed air tank or an hydraulic store is connected under valve control with the drive cylinder, characterised thereby, that one or more throttles (7) are arranged between either the compressed air tank or the hydraulic store (5) and the drive cylinder (1) and is or are controlled in such a manner in dependence on the pressure of either the compressed air tank or the hydraulic store (5) that the throttle cross-section is opened fully , at minimum pressure in either the compressed air tank or the hydraulic store (5) and that the throttle cross-section is reduced with increasing tank pressure.
2. Drive according to claim 1, characterised thereby, that a switch-on valve (3) and a switch-off valve (2) are provided for actuation of a drive cylinder (1).
3. Drive according to claim 1, characterised thereby, that the drive cylinder (1) operates on the differential piston principle and is controlled by a 3/2-way valve (11).
4. Drive according to claim 2, characterised thereby, that the throttle (7) is arranged between the switch-off valve (2) and the drive cylinder (1).
EP86116001A 1986-01-23 1986-11-18 Drive for high-tension power circuit breaker Expired - Lifetime EP0229918B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3601877 1986-01-23
DE3601877A DE3601877C1 (en) 1986-01-23 1986-01-23 Drive for high-voltage circuit breakers

Publications (2)

Publication Number Publication Date
EP0229918A1 EP0229918A1 (en) 1987-07-29
EP0229918B1 true EP0229918B1 (en) 1990-06-13

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Application Number Title Priority Date Filing Date
EP86116001A Expired - Lifetime EP0229918B1 (en) 1986-01-23 1986-11-18 Drive for high-tension power circuit breaker

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DE (2) DE3601877C1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3833484A1 (en) * 1988-10-01 1990-04-05 Asea Brown Boveri Drive device for an electrical switching apparatus
DE4205139C2 (en) * 1992-02-20 1997-10-23 Abb Patent Gmbh Process for controlling switch drives
DE102009015881A1 (en) * 2009-04-01 2010-10-07 Abb Technology Ag Hydromechanical drive for electrical line switches

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE646847C (en) * 1934-02-08 1937-06-23 Elektrowerke Akt Ges Electric switch with arc extinguishing by flowing pressurized gas
DE658698C (en) * 1934-09-02 1938-04-07 Siemens Schuckertwerke Akt Ges Pressurized gas valve for switch with arc extinguishing by flowing pressurized gas
FR1098565A (en) * 1954-01-15 1955-08-08 Hydraulic control device for circuit breaker, or the like
DE1665981B2 (en) * 1967-06-30 1971-10-21 COMPRESSED AIR DRIVE
DE1765677B1 (en) * 1968-06-28 1971-11-11 Licentia Gmbh PRESSURE GAS SWITCH FOR HIGH AND HIGHEST VOLTAGES
DE2047838C3 (en) * 1970-09-22 1979-01-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electric switch with hydraulic actuation
EP0074419B1 (en) * 1981-09-11 1986-01-08 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG High-power electric circuit breaker with a hydraulically operated actuating device
DE3216311A1 (en) * 1982-04-28 1983-11-03 Siemens AG, 1000 Berlin und 8000 München Hydraulic operating device for electrical high-voltage power circuit breakers

Also Published As

Publication number Publication date
DE3672018D1 (en) 1990-07-19
DE3601877C1 (en) 1987-06-04
EP0229918A1 (en) 1987-07-29

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