EP0729637B1 - Electrical gas-blast switch - Google Patents

Electrical gas-blast switch Download PDF

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Publication number
EP0729637B1
EP0729637B1 EP94931508A EP94931508A EP0729637B1 EP 0729637 B1 EP0729637 B1 EP 0729637B1 EP 94931508 A EP94931508 A EP 94931508A EP 94931508 A EP94931508 A EP 94931508A EP 0729637 B1 EP0729637 B1 EP 0729637B1
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EP
European Patent Office
Prior art keywords
compression
piston
armature
gas
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
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EP94931508A
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German (de)
French (fr)
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EP0729637A1 (en
Inventor
Klaus-Peter Rolff
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Siemens AG
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Siemens AG
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Publication date
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Publication of EP0729637A1 publication Critical patent/EP0729637A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/882—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts the movement being assisted by accelerating coils

Definitions

  • the invention relates to an electric pressure gas switch with at least one fixed contact piece and a switching element that can be moved by a drive, with a compression device with a compression piston and a compression cylinder, of which at least one is displaceable by the drive from an on position while reducing a compression space that is limited by the drive , and with an armature which is axially movable by the magnetic field of a stator which can be excited by a shutdown current, the armature being mechanically connected to a drive piston which delimits a compression chamber, and the armature and stator are arranged in such a way that the magnetic field has an armature movement already in the switched-on position of the compression device causes.
  • At least one fixed contact piece can be connected to a connecting piece, if necessary, via a switching piece that can be moved by a drive.
  • a compression device with a compression piston and a compression cylinder surrounds the existing arc space between the contact piece and connector.
  • the compression piston is displaced relative to the compression cylinder, the compression space delimited by them being reduced in order to generate an extinguishing gas flow.
  • an armature is attached via a rod connected to the compression piston.
  • the armature which is formed as part of the piston rod and is made of ferromagnetic material, reaches the effective range of the magnetic field of a stator that is excited by a breaking current. At this moment the compression piston is accelerated in the opposite direction to the movement of the compression cylinder and causes an extinguishing gas pressure increase during the switch-off process.
  • a known (DE-A1-40 10 006) variant of a drive support by the magnetic effect of the switch-off current contains at least one armature attached to the compression cylinder, which plunges into a slot of a yoke during the switch-off process after a partial movement distance of the compression cylinder and supports the compression cylinder movement from this point in time.
  • the object of the invention is to provide a gas pressure switch which, with a comparatively small required stroke of the compression cylinder, enables the arc to be blown with a relatively high initial quenching gas pressure.
  • An important advantage of the invention is that a short-circuit or shutdown current that occurs generates the axial movement of the armature even before the switch is triggered, in the switched-on position of the compression device.
  • a considerable pressure builds up in the compression chamber, which acts on the side of the compression piston which is remote from the compression space.
  • the compression piston thereby moves towards the compression cylinder, so that the compression space delimited by them is reduced in advance.
  • a considerably increased initial pressure builds up in the compression space before the drive starts the actual switch-off process.
  • the increased initial pressure of the quenching gas has an advantageous effect on the blowing of the arc igniting during the shutdown process.
  • the stroke of the compression cylinder can be made shorter accordingly. Depending on the design of the compression chamber, such a high excess pressure can be generated in it that the subsequent switch-off movement of the compression cylinder is supported.
  • the stator is a coil.
  • the coil consists of a section of a connector, the wall of which is traversed by a helically wound radial slot.
  • the gas pressure switch has a fixed contact piece 1 and a connector piece 2 coaxially opposite it at a fixed distance.
  • the contact piece and the connector piece can be electrically connected via a movable contact piece 3.
  • the switching piece is connected via a switching rod 5 and a drive fork 6 to a mechanical drive 7, not shown in detail.
  • the contact piece 3 is firmly connected to a compression cylinder 8.
  • the latter delimits a compression space 12 of the compression device 14 with an axially displaceable compression piston 9 with a packing 10 arranged thereon.
  • the compression cylinder 8 is also connected to the drive 7 via the shift rod 5.
  • Figure 1 shows the compression cylinder 8 in the switched-on position 16, in which the switching piece 3 is in a position connecting the contact piece 1 with the connecting piece 2.
  • an armature 20 which is arranged in the interior 21 of the rear extension 22 of the connecting piece 2 so as to be axially slidably insulated.
  • the armature 20 is made of ferromagnetic material and is connected to a drive piston 24 via a connecting rod 23.
  • a positioning spring 25 ensures - provided there are no further forces acting on the armature 20 - that the armature is shown above the center line in FIG. 1.
  • the continuation 22 of the connecting piece 2 is designed as a stator 26 in the form of a coil 27, in that a section 28 of the connecting piece 22 is traversed in its wall by a continuous, helically wound radial slot 29. The turns are well insulated from each other.
  • the drive piston 24 delimits a compression chamber 30, which communicates via an overflow pipe 31 with a volume V1 between a guide part 32 and the side 33 of the compression piston 9 facing away from the compression space 12.
  • a tension spring 34 which is fixed at one end to the open end of the overflow pipe 31 facing the compression chamber 30 and is fixed at its other end to a stop guide 35 (FIG. 6).
  • the tension spring 34 serves as a positioning spring in order to bring the compression piston into the rest position shown in the upper half of FIG. 1.
  • the stator 26 When the load current (short-circuit current or cut-off current) rises significantly above the rated current, the stator 26 generates a magnetic field, the strength of which is sufficient to pull the armature 20 arranged next to it into the coil 27 against the force of the spring 25 (lower half of FIG. 1, the cutting plane of which 90 ° with respect to the upper half as shown in Figure 1). Due to the associated movement of the drive piston 24, the compression chamber 30 is significantly reduced, so that the compression chamber pressure p k increases significantly. The pressure increase in the compression chamber acts on the side 33 of the compression piston 9 via the overflow pipe 31. The compression piston moves towards the compression cylinder 8, whereby the volume V1 increases and at the same time the compression space 12 is reduced to the volume V2.
  • the pressure in the compression space 12 increases considerably. If a maximum permissible rated current (cut-off current or short-circuit current) is exceeded, the switch then opens and the drive moves the compression cylinder 8 in the direction of arrow A.
  • the contact piece 3 runs off the fixed contact piece 1, it ignites Arc between contact piece 1 and switching piece 3. Due to the increased initial pressure of the extinguishing gas in volume V2, the arc is particularly strongly blown at the beginning, which has an advantageous effect on the extinguishing process. Due to the extinguishing gas initial pressure, which is increased in advance by utilizing the overcurrent energy, and the compression piston 9, which is moved in advance, that of Compression cylinder stroke to be performed drive be reduced accordingly. As illustrated in FIG.
  • the advance movement of the compression cylinder can be limited by a longitudinal groove 40 as a stop guide.
  • the compression piston can also be locked in the advanced position.
  • the pressure in the volume V1 can still be so high that the subsequent compression cylinder movement is supported by the pressure acting on the further cover plate 42 (FIG. 2) of the guide part 32.
  • the bottom of the guide part 32 contains an end plate 42 with at least one valve 43 (FIGS. 2, 4).
  • the valve includes spring-loaded guide pins 45.
  • the filler body 10 and the compression piston 9 form a unit which can slide in a gas-tight manner in the axial direction on the guide part 32 (FIG. 1) and with respect to the compression cylinder 8 and contain at least one valve 50 (FIGS. 3 and 5) (representations enlarged in each case).
  • the covers 52, 53 of the valves 43, 50 are closed before the movement begins.
  • the guide pins 45 of the valve 43 press against the cover 53 of the valve 50.
  • the valve 50 locks the volume V2 by means of a built-in spring 54 against overflow of extinguishing gas from the volume V2 into the volume V1. Accordingly, extinguishing gas is compressed in the volume V2, while the volume V1 to be enlarged is filled via the valve 43.
  • the compression device 14 is, as explained above, before the movement begins the compression chamber 30 has already been reduced and a corresponding pressure in the volume V1 has been built up via the overflow pipe 31. Because of the pressure in the volume V1, both valves 43, 50 remain closed on their covers 52, 53 (the cover 53 rests on the surface 55) and the compression piston 9 is advanced against the restoring force of the spring 34 as described above while reducing the volume V2 .
  • the armature 20 is pushed back into a rest position by the spring 25 and latched there if necessary.
  • the latch is released by the fork 6 again only when the switch-on position 16 is reached, in order to prevent a pressure build-up which makes the switch-on movement more difficult when the switch is made to a short circuit via the compression chamber 24.
  • valve 43 When the compressed gas switch is switched on, the valve 43 is closed.
  • the pressure built up in the volume V1 opens the valve 50 against the closing force of its springs, so that extinguishing gas can flow from the decreasing volume V1 into the volume V2 which increases during switching on.
  • the valve 50 is only brought into its closed position against the force of the spring 54 by the guide pins 45 of the valve 43 when the switch-on position 16 is reached.

Abstract

The invention concerns a gas-blast switch with a gas-compression device (14) comprising a piston (9) and a cylinder (8), at least one of which is moved, during the current cut-off process, by a drive unit (7) out of its current cut-in position (16), reducing the space (12) delimited by the piston and cylinder, the initial quencher-gas pressure being increased by virtue of the fact that the piston (9) is first moved towards the cylinder. In order to use the magnetic effect of the break current for this motion, an armature (20) is fitted which is moved by the magnetic field of a stator (26) that is excited by the cut-off current, the armature causing, by means of a compression chamber (30), pressure to act on the piston (8), thus producing an initial movement.

Description

Die Erfindung betrifft einen elektrischen Druckgasschalter mit mindestens einem feststehenden Kontaktstück und einem von einem Antrieb bewegbaren Schaltstück, mit einer Kompressionseinrichtung mit einem Kompressionskolben und einem Kompressionszylinder, von denen wenigstens einer beim Ausschaltvorgang von dem Antrieb aus einer Einschaltstellung unter Verminderung eines von ihnen begrenzten Kompressionsraumes verschiebbar ist, und mit einem Anker, der vom Magnetfeld eines abschaltstromerregbaren Stators axialbewegbar ist, wobei mit dem Anker ein Antriebskolben mechanisch verbunden ist, der eine Kompressionskammer begrenzt, und wobei Anker und Stator derart angeordnet sind, daß das Magnetfeld bereits in der Einschaltstellung der Kompressionseinrichtung eine Ankerbewegung bewirkt.The invention relates to an electric pressure gas switch with at least one fixed contact piece and a switching element that can be moved by a drive, with a compression device with a compression piston and a compression cylinder, of which at least one is displaceable by the drive from an on position while reducing a compression space that is limited by the drive , and with an armature which is axially movable by the magnetic field of a stator which can be excited by a shutdown current, the armature being mechanically connected to a drive piston which delimits a compression chamber, and the armature and stator are arranged in such a way that the magnetic field has an armature movement already in the switched-on position of the compression device causes.

Aus der DE-A 32 31 169 ist ein elektrischer Druckgasschalter der eingangs genannten Art bekannt, bei dem die magnetische Wirkung des Abschaltstromes für eine Löschgaskompression ausgenutzt wird. Jedoch wird das so komprimierte Löschgas zu einem ungünstigen Zeitpunkt freigegeben.From DE-A 32 31 169 an electrical pressure gas switch of the type mentioned is known, in which the magnetic effect of the cut-off current is used for an extinguishing gas compression. However, the extinguishing gas compressed in this way is released at an unfavorable time.

Bei einem weiteren bekannten (DE-A1-40 10 007) elektrischen Druckgasschalter ist mindestens ein feststehendes Kontaktstück mit einem Anschlußstück bedarfsweise über ein von einem Antrieb bewegbares Schaltstück verbindbar. Eine Kompressionseinrichtung mit einem Kompressionskolben und einem Kompressionszylinder umgibt den zwischen Kontaktstück und Anschlußstück bestehenden Lichtbogenraum. Beim Ausschaltvorgang wird der Kompressionskolben relativ zu dem Kompressionszylinder verschoben, wobei der von ihnen begrenzte Kompressionsraum zum Erzeugen einer Löschgasströmung vermindert wird. Um die magnetische Wirkung des Abschaltstroms zur Antriebsunterstützung zu nutzen, ist ein Anker über eine Stange mit dem Kompressionskolben verbunden. Nachdem der Kompressionszylinder während des Ausschaltvorgangs um eine bestimmte Wegstrecke im Sinne einer Kontakttrennung bewegt ist, gelangt der als Teil der Kolbenstange ausgebildete, aus ferromagnetischem Material bestehende Anker in den Wirkbereich des Magnetfeldes eines abschaltstromerregten Stators. In diesem Moment wird der Kompressionskolben gegenläufig zur Bewegung des Kompressionszylinders beschleunigt und verursacht eine Löschgasdruckerhöhung während des Ausschaltvorgangs.In another known (DE-A1-40 10 007) electrical pressure gas switch, at least one fixed contact piece can be connected to a connecting piece, if necessary, via a switching piece that can be moved by a drive. A compression device with a compression piston and a compression cylinder surrounds the existing arc space between the contact piece and connector. During the switch-off process, the compression piston is displaced relative to the compression cylinder, the compression space delimited by them being reduced in order to generate an extinguishing gas flow. In order to use the magnetic effect of the cut-off current to support the drive, an armature is attached via a rod connected to the compression piston. After the compression cylinder has been moved a certain distance in the sense of a contact separation during the switching-off process, the armature, which is formed as part of the piston rod and is made of ferromagnetic material, reaches the effective range of the magnetic field of a stator that is excited by a breaking current. At this moment the compression piston is accelerated in the opposite direction to the movement of the compression cylinder and causes an extinguishing gas pressure increase during the switch-off process.

Eine bekannte (DE-A1-40 10 006) Variante einer Antriebsunterstützung durch die magnetische Wirkung des Abschaltstroms enthält mindestens einen am Kompressionszylinder befestigten Anker, der beim Ausschaltvorgang nach einer Teilbewegungsstrecke des Kompressionszylinders in einen Schlitz eines Jochs eintaucht und ab diesem Zeitpunkt die Kompressionszylinderbewegung unterstützt.A known (DE-A1-40 10 006) variant of a drive support by the magnetic effect of the switch-off current contains at least one armature attached to the compression cylinder, which plunges into a slot of a yoke during the switch-off process after a partial movement distance of the compression cylinder and supports the compression cylinder movement from this point in time.

Bei einem weiteren bekannten Druckgasschalter (DE-C2-31 41 324) fließt der Nennstrom über den Kompressionszylinder. Erst nach einer Teilbewegung des Kompressionszylinders beim Ausschaltvorgang kommutiert der Abschaltstrom auf eine Gradientenspule, die eine Ringkolbenbewegung zur direkten Unterstützung der Lichtbogenbeblasung erzeugt.In another known compressed gas switch (DE-C2-31 41 324), the nominal current flows through the compression cylinder. Only after a partial movement of the compression cylinder during the switch-off process does the switch-off current commutate to a gradient coil, which generates an annular piston movement to directly support the arc blowing.

Die Aufgabe der Erfindung besteht in der Schaffung eines Druckgasschalters, der bei vergleichsweise geringem erforderlichen Hub des Kompressionszylinders eine Beblasung des Lichtbogens mit einem relativ hohen Anfangslöschgasdruck ermöglicht.The object of the invention is to provide a gas pressure switch which, with a comparatively small required stroke of the compression cylinder, enables the arc to be blown with a relatively high initial quenching gas pressure.

Diese Aufgabe wird erfindungsgemäß bei einem elektrischen Druckgasschalter der eingangs genannten Art dadurch gelost, daß die dem Kompressionsraum abgewandte Seite des Kompressionskolbens mit dem Kompressionskammerdruck beaufschlagt ist, so daß eine Kompressionskammerdruckerhöhung eine Bewegung des Kompressionskolbens in Richtung auf den Kompressionszylinder bewirkt.This object is achieved according to the invention in an electrical pressure gas switch of the type mentioned in the introduction that the compression chamber pressure is applied to the side of the compression piston facing away from the compression chamber, so that an increase in the compression chamber pressure causes a movement of the compression piston in the direction of the compression cylinder.

Ein wesentlicher Vorteil der Erfindung besteht darin, daß ein auftretender Kurzschluß- oder Abschaltstrom bereits vor dem Auslösen des Schalters noch in der Einschaltstellung der Kompressionseinrichtung die Axialbewegung des Ankers erzeugt. Dadurch baut sich in der Kompressionskammer ein erheblicher Druck auf, der die kompressionsraumferne Seite des Kompressionskolbens beaufschlagt. Der Kompressionskolben bewegt sich dadurch dem Kompressionszylinder entgegen, so daß der von ihnen begrenzte Kompressionsraum vorab vermindert wird. Dadurch baut sich in dem Kompressionsraum ein erheblich erhöhter Anfangsdruck auf, bevor der Antrieb den eigentlichen Ausschaltvorgang beginnt. Der erhöhte Anfangsdruck des Löschgases wirkt sich vorteilhaft auf die Beblasung des beim Abschaltvorgang zündenden Lichtbogens aus. Der Hub des Kompressionszylinders kann entsprechend kürzer ausgelegt sein. Je nach Auslegung der Kompressionskammer kann in dieser ein derart hoher Überdruck erzeugt sein, daß die anschließende Ausschaltbewegung des Kompressionszylinders unterstützt wird.An important advantage of the invention is that a short-circuit or shutdown current that occurs generates the axial movement of the armature even before the switch is triggered, in the switched-on position of the compression device. As a result, a considerable pressure builds up in the compression chamber, which acts on the side of the compression piston which is remote from the compression space. The compression piston thereby moves towards the compression cylinder, so that the compression space delimited by them is reduced in advance. As a result, a considerably increased initial pressure builds up in the compression space before the drive starts the actual switch-off process. The increased initial pressure of the quenching gas has an advantageous effect on the blowing of the arc igniting during the shutdown process. The stroke of the compression cylinder can be made shorter accordingly. Depending on the design of the compression chamber, such a high excess pressure can be generated in it that the subsequent switch-off movement of the compression cylinder is supported.

Zur Erhöhung der Durchflutung und einer guten Ausnutzung der magnetischen Wirkung des Abschaltstroms sieht eine bevorzugte Weiterbildung der Erfindung vor, daß der Stator eine Spule ist. Eine diesbezüglich konstruktiv bevorzugte Ausgestaltung besteht darin, daß die Spule aus einem Abschnitt eines Anschlußstücks besteht, dessen Wandung von einem schraubenartig gewundenen Radialschlitz durchzogen ist.In order to increase the flow and to make good use of the magnetic effect of the cut-off current, a preferred development of the invention provides that the stator is a coil. A preferred design in this regard is that the coil consists of a section of a connector, the wall of which is traversed by a helically wound radial slot.

Die Erfindung wird nachfolgend anhand eines zeichnerisch dargestellten Ausführungsbeispiels weiter erläutert; es zeigen:

  • Figur 1 einen erfindungsgemäßen Druckgasschalter in Schnittdarstellung,
  • Figur 2 den Schnitt entlang II-II gemäß Figur 1,
  • Figur 3 den Schnitt entlang III-III gemäß Figur 1,
  • Figur 4 den Schnitt entlang IV-IV gemäß Figur 2,
  • Figur 5 den Schnitt entlang V-V gemäß Figur 3 und
  • Figur 6 den Schnitt entlang VI-VI gemäß Figur 3.
The invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawing; show it:
  • FIG. 1 shows a pressure gas switch according to the invention in a sectional view,
  • FIG. 2 shows the section along II-II according to FIG. 1,
  • FIG. 3 shows the section along III-III according to FIG. 1,
  • FIG. 4 shows the section along IV-IV according to FIG. 2,
  • 5 shows the section along VV according to Figure 3 and
  • 6 shows the section along VI-VI according to FIG. 3.

Der Druckgasschalter hat ein feststehendes Kontaktstück 1 und ein diesem im festen Abstand koaxial gegenüberstehendes Anschlußstück 2. Das Kontaktstück und das Anschlußstück sind über ein bewegbares Schaltstück 3 elektrisch verbindbar. Das Schaltstück ist über eine Schaltstange 5 und eine Antriebsgabel 6 mit einem nicht näher dargestellten mechanischen Antrieb 7 verbunden. Das Schaltstück 3 ist mit einem Kompressionszylinder 8 fest verbunden. Dieser begrenzt mit einem axial verschiebbaren Kompressionskolben 9 mit darauf angeordnetem Füllkörper 10 einen Kompressionsraum 12 der Kompressionseinrichtung 14. Der Kompressionszylinder 8 ist über die Schaltstange 5 ebenfalls mit dem Antrieb 7 verbunden. Figur 1 zeigt den Kompressionszylinder 8 in Einschaltstellung 16, in der das Schaltstück 3 in einer das Kontaktstück 1 mit dem Anschlußstück 2 verbindenden Position ist.The gas pressure switch has a fixed contact piece 1 and a connector piece 2 coaxially opposite it at a fixed distance. The contact piece and the connector piece can be electrically connected via a movable contact piece 3. The switching piece is connected via a switching rod 5 and a drive fork 6 to a mechanical drive 7, not shown in detail. The contact piece 3 is firmly connected to a compression cylinder 8. The latter delimits a compression space 12 of the compression device 14 with an axially displaceable compression piston 9 with a packing 10 arranged thereon. The compression cylinder 8 is also connected to the drive 7 via the shift rod 5. Figure 1 shows the compression cylinder 8 in the switched-on position 16, in which the switching piece 3 is in a position connecting the contact piece 1 with the connecting piece 2.

Im rückwärtigen Bereich des Druckgasschalters befindet sich ein Anker 20, der im Inneren 21 der rückwärtigen Fortsetzung 22 des Anschlußstücks 2 axial gleitbeweglich isoliert angeordnet ist. Der Anker 20 besteht aus ferromagnetischem Material und ist über eine Verbindungsstange 23 mit einem Antriebskolben 24 verbunden. Eine Positionierfeder 25 sorgt - soweit keine weiteren Krafteinwirkungen auf den Anker 20 bestehen - für die oberhalb der Mittellinie in Figur 1 gezeigte Ruhestellung des Ankers. Die Fortsetzung 22 des Anschlußstückes 2 ist als Stator 26 in Form einer Spule 27 ausgebildet, indem ein Abschnitt 28 des Anschlußstücks 22 in seiner Wandung von einem durchgehenden, schraubenartig gewundenen Radialschlitz 29 durchzogen ist. Die Windungen sind gegeneinander elektrisch gut isoliert.In the rear area of the pressure gas switch there is an armature 20 which is arranged in the interior 21 of the rear extension 22 of the connecting piece 2 so as to be axially slidably insulated. The armature 20 is made of ferromagnetic material and is connected to a drive piston 24 via a connecting rod 23. A positioning spring 25 ensures - provided there are no further forces acting on the armature 20 - that the armature is shown above the center line in FIG. 1. The continuation 22 of the connecting piece 2 is designed as a stator 26 in the form of a coil 27, in that a section 28 of the connecting piece 22 is traversed in its wall by a continuous, helically wound radial slot 29. The turns are well insulated from each other.

Der Antriebskolben 24 begrenzt eine Kompressionskammer 30, die über ein Überströmrohr 31 in kommunizierender Verbindung mit einem Volumen V1 zwischen einem Führungsteil 32 und der dem Kompressionsraum 12 abgewandten Seite 33 des Kompressionskolbens 9 steht. Im Überströmrohr 31 ist eine Zugfeder 34 angeordnet, die mit einem Ende an dem der Kompressionskammer 30 zugewandten offenen Ende des Überströmrohrs 31 befestigt ist und mit ihrem anderen Ende an einer Anschlagführung 35 (Figur 6) fixiert ist. Die Zugfeder 34 dient als Positionierfeder, um den Kompressionskolben in die in der oberen Hälfte der Figur 1 gezeigte Ruhestellung zu bringen.The drive piston 24 delimits a compression chamber 30, which communicates via an overflow pipe 31 with a volume V1 between a guide part 32 and the side 33 of the compression piston 9 facing away from the compression space 12. Arranged in the overflow pipe 31 is a tension spring 34 which is fixed at one end to the open end of the overflow pipe 31 facing the compression chamber 30 and is fixed at its other end to a stop guide 35 (FIG. 6). The tension spring 34 serves as a positioning spring in order to bring the compression piston into the rest position shown in the upper half of FIG. 1.

Bei einem erheblich über den Nennstrom ansteigenden Laststrom (Kurzschlußstrom oder Abschaltstrom) erzeugt der Stator 26 ein Magnetfeld, dessen Stärke ausreicht, den benachbart angeordneten Anker 20 in die Spule 27 entgegen der Kraft der Feder 25 hineinzuziehen (untere Hälfte der Figur 1, deren Schnittebene um 90° bezüglich der oberen Hälfte gemaß Figur 1 versetzt ist). Durch die damit verbundene Bewegung des Antriebskolbens 24 wird die Kompressionskammer 30 erheblich verkleinert, so daß der Kompressionskammerdruck pk erheblich ansteigt. Die Druckerhöhung in der Kompressionskammer beaufschlagt über das Überströmrohr 31 die Seite 33 des Kompressionskolbens 9. Der Kompressionskolben bewegt sich auf den Kompressionszylinder 8 zu, wodurch sich das Volumen V1 vergrößert und gleichzeitig der Kompressionsraum 12 auf das Volumen V2 verringert wird. Dadurch erfolgt eine erhebliche Druckerhöhung in dem Kompressionsraum 12. Bei Überschreiten eines höchstzulässigen Nennstroms (Abschaltstrom oder Kurzschlußstrom) öffnet anschließend der Schalter, und der Antrieb bewegt den Kompressionszylinder 8 in Richtung des Pfeils A. Beim Ablaufen des Schaltstücks 3 von dem festen Kontaktstück 1 zündet ein Lichtbogen zwischen dem Kontaktstück 1 und dem Schaltstück 3. Der Lichtbogen wird aufgrund des erhöhten Anfangsdrucks des Löschgases in dem Volumen V2 bereits zu Beginn besonders stark beblasen, was sich auf den Löschvorgang vorteilhaft auswirkt. Durch den vorab durch Ausnutzung der Überstromenergie erhöhten Löschgasanfangsdruck und den vorab bewegten Kompressionskolben 9 kann der von dem Antrieb zu leistende Kompressionszylinderhub entsprechend vermindert werden. Wie Figur 6 verdeutlicht, kann die Vorabbewegung des Kompressionszylinders durch eine Längsnut 40 als Anschlagführung begrenzt werden. Der Kompressionskolben kann in der vorgeschobenen Stellung zusätzlich verriegelt sein. Der Druck im Volumen V1 kann bei entsprechender Gestaltung der Kompressionskammer 30 auch bei vorgeschobenem Kompressionskolben 9 noch so hoch sein, daß die anschließende Kompressionszylinderbewegung durch den auf die weitere Abschlußscheibe 42 (Figur 2) des Führungsteils 32 wirkenden Druck unterstützt wird.When the load current (short-circuit current or cut-off current) rises significantly above the rated current, the stator 26 generates a magnetic field, the strength of which is sufficient to pull the armature 20 arranged next to it into the coil 27 against the force of the spring 25 (lower half of FIG. 1, the cutting plane of which 90 ° with respect to the upper half as shown in Figure 1). Due to the associated movement of the drive piston 24, the compression chamber 30 is significantly reduced, so that the compression chamber pressure p k increases significantly. The pressure increase in the compression chamber acts on the side 33 of the compression piston 9 via the overflow pipe 31. The compression piston moves towards the compression cylinder 8, whereby the volume V1 increases and at the same time the compression space 12 is reduced to the volume V2. As a result, the pressure in the compression space 12 increases considerably. If a maximum permissible rated current (cut-off current or short-circuit current) is exceeded, the switch then opens and the drive moves the compression cylinder 8 in the direction of arrow A. When the contact piece 3 runs off the fixed contact piece 1, it ignites Arc between contact piece 1 and switching piece 3. Due to the increased initial pressure of the extinguishing gas in volume V2, the arc is particularly strongly blown at the beginning, which has an advantageous effect on the extinguishing process. Due to the extinguishing gas initial pressure, which is increased in advance by utilizing the overcurrent energy, and the compression piston 9, which is moved in advance, that of Compression cylinder stroke to be performed drive be reduced accordingly. As illustrated in FIG. 6, the advance movement of the compression cylinder can be limited by a longitudinal groove 40 as a stop guide. The compression piston can also be locked in the advanced position. With a corresponding design of the compression chamber 30, even with the compression piston 9 advanced, the pressure in the volume V1 can still be so high that the subsequent compression cylinder movement is supported by the pressure acting on the further cover plate 42 (FIG. 2) of the guide part 32.

Nachfolgend werden anhand der Figuren 2 bis 5 die bei verschiedenen Schalterbetriebsfällen auftretenden Strömungsverhältnisse für das Löschgas erläutert. Der Boden des Führungsteils 32 enthält eine Abschlußscheibe 42 mit zumindest einem Ventil 43 (Figuren 2, 4). Das Ventil umfaßt federbeaufschlagte Führungsstifte 45.The flow conditions for the extinguishing gas which occur in various switch operating cases are explained below with reference to FIGS. 2 to 5. The bottom of the guide part 32 contains an end plate 42 with at least one valve 43 (FIGS. 2, 4). The valve includes spring-loaded guide pins 45.

Der Füllkörper 10 und der Kompressionskolben 9 bilden eine Einheit, die auf dem Führungsteil 32 (Figur 1) und bezüglich des Kompressionszylinders 8 gasdicht in axiale Richtung gleiten können und zumindest ein Ventil 50 (Figuren 3 und 5) enthalten (Darstellungen jeweils vergrößert).The filler body 10 and the compression piston 9 form a unit which can slide in a gas-tight manner in the axial direction on the guide part 32 (FIG. 1) and with respect to the compression cylinder 8 and contain at least one valve 50 (FIGS. 3 and 5) (representations enlarged in each case).

Bei einem Ausschaltvorgang eines Laststroms ohne zur Ankerbewegung ausreichende Erregung des Stators 26 sind vor Bewegungsbeginn die Deckel 52, 53 der Ventile 43, 50 geschlossen. Die Führungsstifte 45 des Ventils 43 drücken gegen die Deckel 53 des Ventils 50. Nach Bewegungsbeginn sperrt das Ventil 50 mittels eingebauter Feder 54 das Volumen V2 gegen ein Überströmen von Löschgas von dem Volumen V2 in das Volumen V1. Demgemäß wird im Volumen V2 Löschgas komprimiert, während sich das zu vergrößernde Volumen V1 über das Ventil 43 füllt.When a load current is switched off without sufficient excitation of the stator 26 to move the armature, the covers 52, 53 of the valves 43, 50 are closed before the movement begins. The guide pins 45 of the valve 43 press against the cover 53 of the valve 50. After the start of the movement, the valve 50 locks the volume V2 by means of a built-in spring 54 against overflow of extinguishing gas from the volume V2 into the volume V1. Accordingly, extinguishing gas is compressed in the volume V2, while the volume V1 to be enlarged is filled via the valve 43.

Bei einem Abschalt- oder Kurzschlußstrom ist wie vorstehend erläutert vor Bewegungsbeginn der Kompressionseinrichtung 14 bereits die Kompressionskammer 30 verkleinert und über das Überströmrohr 31 ein entsprechender Druck im Volumen V1 aufgebaut. Beide Ventile 43, 50 bleiben wegen des Drucks im Volumen V1 auf ihre Deckel 52, 53 (der Deckel 53 liegt auf der Fläche 55 auf) geschlossen und der Kompressionskolben 9 wird gegen die Rückstellkraft der Feder 34 wie vorstehend beschrieben unter Verminderung des Volumens V2 vorgeschoben. Nach Unterbrechung des Abschalt- bzw. Kurzschlußstroms wird der Anker 20 durch die Feder 25 in eine Ruhestellung zurückgeschoben und dort bedarfsweise verklinkt. Die Verklinkung wird durch die Gabel 6 erst wieder bei Erreichen der Einschaltstellung 16 gelöst, um zu verhindern, daß bei einer Einschaltung auf einen Kurzschluß über die Kompressionskammer 24 ein Druckaufbau erfolgt, der die Einschaltbewegung erschwert.In the case of a cut-off or short-circuit current, the compression device 14 is, as explained above, before the movement begins the compression chamber 30 has already been reduced and a corresponding pressure in the volume V1 has been built up via the overflow pipe 31. Because of the pressure in the volume V1, both valves 43, 50 remain closed on their covers 52, 53 (the cover 53 rests on the surface 55) and the compression piston 9 is advanced against the restoring force of the spring 34 as described above while reducing the volume V2 . After interruption of the cut-off or short-circuit current, the armature 20 is pushed back into a rest position by the spring 25 and latched there if necessary. The latch is released by the fork 6 again only when the switch-on position 16 is reached, in order to prevent a pressure build-up which makes the switch-on movement more difficult when the switch is made to a short circuit via the compression chamber 24.

Beim Einschalten des Druckgasschalters ist das Ventil 43 geschlossen. Der im Volumen V1 aufgebaute Druck öffnet das Ventil 50 gegen die Schließkraft seiner Federn, so daß Löschgas vom sich verkleinernden Volumen V1 in das sich während des Einschaltens vergrößernde Volumen V2 überströmen kann. Das Ventil 50 wird erst bei Erreichen der Einschaltstellung 16 beispielsweise durch die Führungsstifte 45 des Ventils 43 in seine Schließposition entgegen der Kraft der Feder 54 gebracht.When the compressed gas switch is switched on, the valve 43 is closed. The pressure built up in the volume V1 opens the valve 50 against the closing force of its springs, so that extinguishing gas can flow from the decreasing volume V1 into the volume V2 which increases during switching on. The valve 50 is only brought into its closed position against the force of the spring 54 by the guide pins 45 of the valve 43 when the switch-on position 16 is reached.

Claims (3)

  1. Electrical gas-blast switch
    - having at least one fixed contact part (1) and a switching part (3) which can be moved by a drive (7)
    - having a compression device (14) having a compression piston (9) and a compression cylinder (8), of which at least one can be displaced during the opening procedure by the drive (7) from a closed position (16) with the reduction of a compression area (12) limited by them, and
    - having an armature (20) which can be axially moved by the magnetic field of a stator (26) which can be excited by interrupting current, whereby
    there is mechanically connected to the armature (20) a drive piston (24) which limits a compression chamber (30), and whereby the armature (20) and the stator (26) are arranged in such a way that the magnetic field effects an armature movement already in the closed position (16) of the compression device (14),
    characterized in that the side (33) of the compression piston (9) directed away from the compression area (12) is loaded with the compression-chamber pressure (pk) so that an increase in the compression-chamber pressure effects a movement of the compression piston (9) in the direction of the compression cylinder (8).
  2. Gas-blast switch according to claim 1,
    characterized in that the stator (26) is a coil (27).
  3. Gas-blast switch according to claim 2,
    characterized in that the coil (27) comprises a section (28) of a connector (22), through the wall of which a radial slot (29) wound in screw-like manner passes.
EP94931508A 1993-11-19 1994-10-27 Electrical gas-blast switch Expired - Lifetime EP0729637B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4339923 1993-11-19
DE4339923A DE4339923A1 (en) 1993-11-19 1993-11-19 Electric gas pressure switch
PCT/DE1994/001298 WO1995014303A1 (en) 1993-11-19 1994-10-27 Electrical gas-blast switch

Publications (2)

Publication Number Publication Date
EP0729637A1 EP0729637A1 (en) 1996-09-04
EP0729637B1 true EP0729637B1 (en) 1997-07-09

Family

ID=6503248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94931508A Expired - Lifetime EP0729637B1 (en) 1993-11-19 1994-10-27 Electrical gas-blast switch

Country Status (6)

Country Link
US (1) US5742016A (en)
EP (1) EP0729637B1 (en)
JP (1) JPH09505180A (en)
CA (1) CA2176954A1 (en)
DE (2) DE4339923A1 (en)
WO (1) WO1995014303A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629475A1 (en) * 1996-07-10 1998-01-15 Siemens Ag Pressurized gas circuit breaker
DE19745550A1 (en) * 1997-10-10 1999-04-15 Siemens Ag Gas-blast circuit-breaker arrangement
DE10355535B4 (en) * 2003-11-27 2009-08-27 A. Raymond Et Cie Device for the sealed connection of two end pieces

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549842A (en) * 1966-11-21 1970-12-22 Westinghouse Electric Corp Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means
US3745281A (en) * 1970-02-20 1973-07-10 Hitachi Ltd Gas-blast circuit breaker having a floating puffer piston driven by electromagnetic force
DE2319836C3 (en) * 1973-04-17 1981-12-24 Hitachi, Ltd., Tokyo Circuit breaker
US4041263A (en) * 1975-08-22 1977-08-09 General Electric Company Electric circuit interrupter of the puffer type comprising a magnetically actuated piston
CH594977A5 (en) * 1976-03-29 1978-01-31 Bbc Brown Boveri & Cie
CH594281A5 (en) * 1976-05-24 1978-01-13 Bbc Brown Boveri & Cie
DE3141324C2 (en) * 1981-10-17 1986-02-06 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Circuit breaker
DE3231169A1 (en) * 1982-08-21 1984-02-23 BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau Puffer circuit breaker
DE4010007A1 (en) * 1990-03-26 1991-10-02 Siemens Ag Pressure gas circuit breaker with driven compression cylinder
DE4010006A1 (en) * 1990-03-26 1991-10-02 Siemens Ag Electrical pressure gas circuit breaker with mechanical compression - quenches gas and has conductor through which current flows in longitudinal direction surrounded by at least one ferromagnetic body

Also Published As

Publication number Publication date
DE59403330D1 (en) 1997-08-14
EP0729637A1 (en) 1996-09-04
JPH09505180A (en) 1997-05-20
CA2176954A1 (en) 1995-03-26
US5742016A (en) 1998-04-21
WO1995014303A1 (en) 1995-05-26
DE4339923A1 (en) 1995-05-24

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