EP0665565A2 - Contact system for high power circuit breaker - Google Patents

Contact system for high power circuit breaker Download PDF

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Publication number
EP0665565A2
EP0665565A2 EP95101010A EP95101010A EP0665565A2 EP 0665565 A2 EP0665565 A2 EP 0665565A2 EP 95101010 A EP95101010 A EP 95101010A EP 95101010 A EP95101010 A EP 95101010A EP 0665565 A2 EP0665565 A2 EP 0665565A2
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EP
European Patent Office
Prior art keywords
contact
contact piece
piece
contact system
fixed
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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.)
Granted
Application number
EP95101010A
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German (de)
French (fr)
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EP0665565A3 (en
EP0665565B1 (en
Inventor
Prof. Dr. Ottmar Müller
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ABB Patent GmbH
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ABB Patent GmbH
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Publication of EP0665565A2 publication Critical patent/EP0665565A2/en
Publication of EP0665565A3 publication Critical patent/EP0665565A3/en
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Publication of EP0665565B1 publication Critical patent/EP0665565B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • H01H1/385—Contact arrangements for high voltage gas blast circuit breakers
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • 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
    • H01H33/90—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 this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—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 this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • the invention relates to a contact system for a high-voltage circuit breaker according to the preamble of claim 1.
  • Such high-voltage circuit breakers are SF6-gas-insulated switches which have a fixed contact piece, over which a movable contact piece can be pushed, with the movable contact piece being assigned a blower piston or blow cylinder system which compresses a gas volume during the switching-off process, so that after the blow cylinder has run off the fixed contact piece a gas flow for blowing the arc that arises between the movable contact piece and the fixed contact piece is generated.
  • the object of the invention is to provide a contact system of the type mentioned, in which the erosion behavior is improved.
  • the movable contact piece and, moreover, the contact fingers slide along the fixed contact piece until the contact fingers have detached from the fixed contact piece.
  • the erosion contact piece is still on the contact finger, and as soon as it has left the movable contact piece, the arc burns between the fixed contact piece and the erosion contact piece.
  • the erosion contact piece is made of graphite
  • the arc has a base point on the erosion contact piece or on the graphite ring, on which it can also rotate, so that experience has shown that no discrete base points, i. H. Hot spots occur and peaks are avoided after the arc is extinguished. This promotes the reconsolidation of the switching path and considerably reduces the proportion of metal fluorides.
  • Graphite only forms gaseous waste products, especially CF4; the solid waste products that arise when only metal contact pieces are provided are avoided.
  • the erosion contact piece made of graphite remains relatively flat even after frequent arcing, so that only a weakly inhomogeneous field can arise.
  • the arc base on the graphite is diffuse, which means that extreme hot spots that contribute to strong electrode erosion and can generate metal vapor are practically excluded.
  • a further advantageous embodiment of the invention can be found in claim 5. It is thereby achieved that the outer casing of the circuit breaker, that is to say the switch housing, can be produced from plastic.
  • the shielding pot has the advantage that a weakly inhomogeneous field is generated on the outside and all sharp-edged live parts are shielded. In addition, the shielding pot makes it easy to design such live parts.
  • the metal shielding through the shielding pot also absorbs the hot gases during a switching operation and thus protects the insulating housing of the switching chamber.
  • additional contact leaf springs can be provided which bear against the inner surface of the shielding pot and thus form the actual continuous current contacts. If the contact leaf springs extend in the direction of the shielding pot base, then these additionally form a shield, so that the entire shield wall formed by the shielding pot and the contact leaf springs is extended, so that the hot gases of the switching arcs from the insulating wall in one more larger area can be kept away. For the decay process, times of 10 ms already provide a considerable protective effect for the insulating housing.
  • the pot shape of the shield forms a mechanical reinforcement of the entire insulating housing, since the stress on the floor surface is absorbed by the rounded shield or the rounded shielding pot due to the increased pressure values during the switch-off process and is transmitted to the mechanically very stable housing cylinder wall. Furthermore, the reinforced floor surface allows the mechanical attachment of connecting parts, for. B. the fixed contact piece.
  • the sole figure shows a circuit breaker according to the invention in a sectional view and in the switched-on state.
  • an insulating housing 10 consisting of insulating material, which has a cylindrical section 11 and a roof section 12, there is a shielding housing 13 made of metal, which has a pot shape, the cylinder wall 14 abutting the inner surface of the cylinder section 11.
  • the bottom 15 of the shielding pot is thickened with respect to the cylinder wall 14.
  • the fixed contact piece 16 interacts with a tubular, movable contact piece 17 via the contact fingers 27, to which a piston crown 18 is attached, which is radial and perpendicular to the central longitudinal axis on the inner surface of the cylinder wall 11 of the insulating housing with the interposition of piston rings 38 - preferably made of PTFE - slides.
  • the movable switching tube 17 protrudes beyond the piston crown 18 to receive the contact fingers 27 on one side; at a distance from the free end 19 of the Scahlt tube 17 in the area of the contact fingers 27, an inner cylinder 20 and an outer cylinder 21 are fastened to the piston crown 18, the ends of which facing away from the piston crown 18 each have a flange 22 or 23 towards the inside.
  • the flanges 22 and 23 are arranged at a distance from one another and resiliently accommodate an erosion ring 24, which is preferably made of graphite.
  • This erosion ring can be closed or composed of several ring parts, which improves assembly.
  • the inner and outer cylinders are firmly connected to one another in the section adjacent to the piston crown 18, so that the two cylinders are separated from one another only in a flanged region 25, so that a relative stiff suspension of the two flanged edges 22 and 23 is generated.
  • a cage 26 is formed between the free switching tube end 19 and the two cylinders 20 and 21, which has contact fingers 27, which have a bearing section 28, which is located in the vicinity of the piston head 18, and a contact area 29.
  • the contact area 29 is located between the free end of the switching tube 19 and the flanged edge 22.
  • the contact fingers have a recess 30 in which a leaf spring 31 is provided which is supported on the inner surface of the cylinder 20 and thus the contact finger 27 press the support point at 29 inwards against the fixed contact piece 16, the movement inward being effected on the one hand by the free switching tube end 19 and on the other hand by an axially extending recess 31 on the flanged edge 22 and an axially extending projection 32 on the contact finger 27, the Projection 32 is provided at the end of the contact finger 27 on the contact surface side.
  • a blowing cylinder 33 is also attached, which surrounds the outer cylinder 21 at a distance and is bent towards the fixed contact piece 16; the blow cylinder 33 defines an opening 34 there, which serves as a nozzle for the extinguishing gases. Furthermore, contact leaf springs 35 are attached to the piston crown 18, which come to bear against the inner surface of the cylinder section 14 of the shielding pot 13 and extend from the piston crown 18 in the direction of the pot bottom of the shielding pot.
  • the movable contact piece 17 moves together with the piston or pot base 18, the contact arrangement and the blow cylinder 33 in the direction of arrow P, the gas in the space 37 being compressed until the contact finger part 29 or the Burn-off contact 24 leaves the fixed contact piece 16. Thereafter, the compressed gas flows in the direction of the arrow P 1 into the nozzle 34 and thereby blows the arc in which a partial flow of the gas is blown off through the movable switching tube 17 and another partial flow of the gas through the nozzle 34.
  • the contact between the shielding pot 13 and the contact leaf springs 35 is interrupted, so that the continuous current flowing there is commutated to the contact fingers 29 or the erosion contact pieces 24.

Landscapes

  • Circuit Breakers (AREA)
  • Contacts (AREA)

Abstract

The high voltage power switch has a cylindrical housing (11) with an internal metal screening (13). Projecting internally at the centre is a contact element (16). Located over this is a tubular contact carrier (17) that can move axially by displacement of a piston (18). Contact fingers (27) are positioned in the gap within a cage (26). Positioned in parallel is a burn off contact ring (24). When the main contacts open the burn-off contact remains in engagement to minimise main contact cover. The burn-off contact is of graphite and diffuses the arcing effect.

Description

Die Erfindung betrifft ein Kontaktsystem für einen Hochspannungsleistungsschalter nach dem Oberbegriff des Anspruches 1.The invention relates to a contact system for a high-voltage circuit breaker according to the preamble of claim 1.

Derartige Hochspannungsleistungsschalter sind SF₆-gasisolierte Schalter, die ein festes Kontaktstück aufweisen, über welches ein bewegliches Kontaktstück schiebbar ist, wobei dem beweglichen Kontaktstück ein Blaskolben- oder Blaszylindersystem zugeordnet ist, welches beim Ausschaltvorgang ein Gasvolumen zusammenpreßt, so daß nach Ablaufen des Blaszylinders vom festen Kontaktstück eine Gasströmung zur Beblasung des zwischen dem beweglichen Kontaktstück und dem festen Kontaktstück entstehenden Lichtbogens erzeugt wird.Such high-voltage circuit breakers are SF₆-gas-insulated switches which have a fixed contact piece, over which a movable contact piece can be pushed, with the movable contact piece being assigned a blower piston or blow cylinder system which compresses a gas volume during the switching-off process, so that after the blow cylinder has run off the fixed contact piece a gas flow for blowing the arc that arises between the movable contact piece and the fixed contact piece is generated.

Aufgabe der Erfindung ist es, ein Kontaktsystem der eingangs genannten Art zu schaffen, bei dem das Abbrandverhalten verbessert ist.The object of the invention is to provide a contact system of the type mentioned, in which the erosion behavior is improved.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.This object is achieved by the characterizing features of claim 1.

Wenn ein Ausschaltvorgang stattfindet, dann gleiten das bewegliche Kontaktstück und darüberhinaus die Kontaktfinger auf dem festen Kontaktstück entlang, so lange, bis sich die Kontaktfinger von dem festen Kontaktstück gelöst haben. Dabei liegt das Abbrandkontaktstück noch am Kontaktfinger an, und sobald dieses das bewegliche Kontaktstück verlassen hat, brennt der Lichtbogen zwischen dem festen Kontaktstück und dem Abbrandkontaktstück.When a switch-off process takes place, the movable contact piece and, moreover, the contact fingers slide along the fixed contact piece until the contact fingers have detached from the fixed contact piece. The erosion contact piece is still on the contact finger, and as soon as it has left the movable contact piece, the arc burns between the fixed contact piece and the erosion contact piece.

Wenn gemäß Anspruch 2 das Abbrandkontaktstück aus Graphit hergestellt ist, dann besitzt der Lichtbogen einen Fußpunkt auf dem Abbrandkontaktstück bzw. auf dem Graphitring, auf dem er auch rotieren kann, so daß erfahrungsgemäß keine diskreten Fußpunkte, d. h. Heißpunkte, entstehen und Spitzen nach dem Lichtbogenverlöschen vermieden werden. Dieses fördert die Wiederverfestigung der Schaltstrecke und reduziert den Anteil an Metallfluoriden erheblich. Graphit bildet nur gasförmige Abfallprodukte, insbesondere CF₄; die festen Abfallprodukte, die dann entstehen, wenn lediglich Metallkontaktstücke vorgesehen sind, werden vermieden. Das Abbrandkontaktstück aus Graphit bleibt auch nach häufiger Lichtbogenbeanspruchung relativ eben, so daß lediglich ein schwach inhomogenes Feld entstehen kann. Der Lichtbogenfußpunkt auf dem Graphit ist diffus, weswegen extreme Heißpunkte, die zu starken Elektrodenerosionen beitragen und Metalldampf erzeugen können, praktisch ausgeschlossen sind.If, according to claim 2, the erosion contact piece is made of graphite, then the arc has a base point on the erosion contact piece or on the graphite ring, on which it can also rotate, so that experience has shown that no discrete base points, i. H. Hot spots occur and peaks are avoided after the arc is extinguished. This promotes the reconsolidation of the switching path and considerably reduces the proportion of metal fluorides. Graphite only forms gaseous waste products, especially CF₄; the solid waste products that arise when only metal contact pieces are provided are avoided. The erosion contact piece made of graphite remains relatively flat even after frequent arcing, so that only a weakly inhomogeneous field can arise. The arc base on the graphite is diffuse, which means that extreme hot spots that contribute to strong electrode erosion and can generate metal vapor are practically excluded.

Eine weitere vorteilhafte Ausgestaltung der Erfindung ist dem Anspruch 5 zu entnehmen. Dadurch wird es erreicht, daß die Außenhülle des Leistungsschalters, also das Schaltgerhäuse, aus Kunststoff hergestellt werden kann. Der Abschirmtopf hat einerseits den Vorteil, daß dadurch nach außen ein schwach inhomogenes Feld erzeugt wird und alle scharfkantigen spannungsführenden Teile abgeschirmt werden. Darüberhinaus erlaubt es der Abschirmtopf, solche spannungsführenden Teile einfach zu gestalten. Die Metallschirmung durch den Abschirmtopf nimmt darüberhinaus bei einem Schaltvorgang die heißen Gase auf und schützt damit das Isoliergehäuse der Schaltkammer.A further advantageous embodiment of the invention can be found in claim 5. It is thereby achieved that the outer casing of the circuit breaker, that is to say the switch housing, can be produced from plastic. The shielding pot has the advantage that a weakly inhomogeneous field is generated on the outside and all sharp-edged live parts are shielded. In addition, the shielding pot makes it easy to design such live parts. The metal shielding through the shielding pot also absorbs the hot gases during a switching operation and thus protects the insulating housing of the switching chamber.

Mit dem Vorsehen des Abschirmtopfes können gemäß dem Anspruch 6 zusätzliche Kontaktblattfedern vorgesehen werden, die gegen die Innenfläche des Abschirmtopfes anliegen und damit die eigentlichen Dauerstromkontakte bilden. Wenn sich die Kontaktblattfedern gemäß Anspruch 7 in Richtung zum Abschirmtopfboden erstrecken, dann bilden diese zusätzlich noch eine Abschirmung, so daß die gesamte, durch den Abschirmtopf und die Kontaktblattfedern gebildete Schirmwand verlängert wird, so daß die heißen Gase der Schaltlichtbögen von der Isolierwand in einem noch größeren Bereich ferngehalten werden können. Für den Abklingvorgang bringen Zeiten von 10 ms bereits eine erhebliche Schutzwirkung für das Isolierstoffgehäuse.With the provision of the shielding pot, additional contact leaf springs can be provided which bear against the inner surface of the shielding pot and thus form the actual continuous current contacts. If the contact leaf springs extend in the direction of the shielding pot base, then these additionally form a shield, so that the entire shield wall formed by the shielding pot and the contact leaf springs is extended, so that the hot gases of the switching arcs from the insulating wall in one more larger area can be kept away. For the decay process, times of 10 ms already provide a considerable protective effect for the insulating housing.

Darüberhinaus bildet die Topfform der Abschirmung eine mechanische Verstärkung des gesamten Isoliergehäuses, da die Beanspruchung der Bodenfläche aufgrund der erhöhten Druckwerte beim Ausschaltvorgang von der abgerundeten Abschirmung bzw. von dem abgerundeten Abschirmtopf aufgenommen wird und auf die mechanisch sehr stabile Gehäusezylinderwand übertragen wird. Desweiteren gewährt die verstärkte Bodenfläche die mechanische Befestigung von Anschlußteilen, z. B. das feste Kontaktstück.In addition, the pot shape of the shield forms a mechanical reinforcement of the entire insulating housing, since the stress on the floor surface is absorbed by the rounded shield or the rounded shielding pot due to the increased pressure values during the switch-off process and is transmitted to the mechanically very stable housing cylinder wall. Furthermore, the reinforced floor surface allows the mechanical attachment of connecting parts, for. B. the fixed contact piece.

Weitere vorteilhafte Ausgestaltungen und Verbesserungen sowie weitere Vorteile der Erfindung sind den weiteren Unteransprüchen zu entnehmen.Further advantageous refinements and improvements and further advantages of the invention can be found in the further subclaims.

Es zeigt die einzige Figur einen Leistungsschalter gemäß der Erfindung in Schnittansicht und im Einschaltzustand.The sole figure shows a circuit breaker according to the invention in a sectional view and in the switched-on state.

Innerhalb eines aus Isolierstoff bestehenden Isoliergehäuses 10, das einen zylindrischen Abschnitt 11 und einen Dachabschnitt 12 aufweist, befindet sich ein Abschirmgehäuse 13 aus Metall, welches eine Topfform aufweist, wobei die Zylinderwand 14 an der Innenfläche des Zylinderabschnittes 11 anliegt. Der Boden 15 des Abschirmtopfes ist gegenüber der Zylinderwand 14 verdickt ausgebildet. An der Innenseite des Topfbodens 15 befindet sich ein festes Kontaktstück 16, welches am Topfboden in nicht näher dargestellter Weise befestigt ist. Das feste Kontaktstück 16 wirkt mit einem rohrförmigen, beweglichen Kontaktstück 17 über die Kontaktfinger 27 zusammen, an dem ein Kolbenboden 18 befestigt ist, der radial und senkrecht zur Mittellängsachse an der Innenfläche der Zylinderwand 11 des Isoliergehäuses unter Zwischenfügung von Kolbenringen 38 - vorzugsweise aus PTFE - gleitet. Das bewegliche Schaltrohr 17 ragt über den Kolbenboden 18 hinaus um die Kontaktfinger 27 einseitig aufzunehmen; in Abstand zu dem freien Ende 19 des Scahltrohres 17 im Bereich der Kontaktfinger 27 sind an dem Kolbenboden 18 ein Innenzylinder 20 und ein Außenzylinder 21 befestigt, deren dem Kolbenboden 18 abgewandte Enden je eine Umbördelung 22 bzw. 23 nach innen aufweisen. Die Umbördelungen 22 und 23 sind in Abstand zueinander angeordnet und nehmen zwischen sich federnd einen Abbrandring 24 auf, der vorzugsweise aus Graphit besteht. Dieser Abbrandring kann geschlossen oder aus mehreren Ringteilen zusammengesetzt sein, was die Montage verbessert. Der Innen- und Außenzylinder sind miteinander in dem dem Kolbenboden 18 benachbarten Abschnitt fest miteinander verbunden, so daß lediglich in einem bördelseitigen Bereich 25 die beiden Zylinder voneinander getrennt sind, so daß eine relativ steife Federung der beiden Bördelränder 22 und 23 erzeugt wird.Inside an insulating housing 10 consisting of insulating material, which has a cylindrical section 11 and a roof section 12, there is a shielding housing 13 made of metal, which has a pot shape, the cylinder wall 14 abutting the inner surface of the cylinder section 11. The bottom 15 of the shielding pot is thickened with respect to the cylinder wall 14. On the inside of the pot base 15 there is a fixed contact piece 16 which is attached to the pot base in a manner not shown. The fixed contact piece 16 interacts with a tubular, movable contact piece 17 via the contact fingers 27, to which a piston crown 18 is attached, which is radial and perpendicular to the central longitudinal axis on the inner surface of the cylinder wall 11 of the insulating housing with the interposition of piston rings 38 - preferably made of PTFE - slides. The movable switching tube 17 protrudes beyond the piston crown 18 to receive the contact fingers 27 on one side; at a distance from the free end 19 of the Scahlt tube 17 in the area of the contact fingers 27, an inner cylinder 20 and an outer cylinder 21 are fastened to the piston crown 18, the ends of which facing away from the piston crown 18 each have a flange 22 or 23 towards the inside. The flanges 22 and 23 are arranged at a distance from one another and resiliently accommodate an erosion ring 24, which is preferably made of graphite. This erosion ring can be closed or composed of several ring parts, which improves assembly. The inner and outer cylinders are firmly connected to one another in the section adjacent to the piston crown 18, so that the two cylinders are separated from one another only in a flanged region 25, so that a relative stiff suspension of the two flanged edges 22 and 23 is generated.

Zwischen dem freien Schaltrohrende 19 und den beiden Zylindern 20 und 21 ist ein Käfig 26 gebildet, der Kontaktfinger 27 aufweist, welche einen Lagerungsabschnitt 28, der sich in der Nähe des Kolbenbodens 18 befindet, und einen Kontaktbereich 29 besitzen. Der Kontaktbereich 29 befindet sich zwischen dem freien Ende des Schaltrohres 19 und dem Bördelrand 22. Radial außen besitzen die Kontaktfinger eine Ausnehmung 30, in der eine Blattfeder 31 vorgesehen sind, welche sich an der Innenfläche des Zylinders 20 abstützen und so den Kontaktfinger 27, um die Auflagestelle bei 29 drehbar nach innen gegen das feste Kontaktstück 16 drücken, wobei die Bewegung nach innen einerseits durch das freie Schaltrohrende 19 und andererseits durch einen axial verlaufenden Rücksprung 31 am Bördelrand 22 und einen axial verlaufenden Vorsprung 32 am Kontaktfinger 27 bewirkt wird, wobei der Vorsprung 32 an dem kontaktflächenseitigen Ende des Kontaktfingers 27 vorgesehen ist.A cage 26 is formed between the free switching tube end 19 and the two cylinders 20 and 21, which has contact fingers 27, which have a bearing section 28, which is located in the vicinity of the piston head 18, and a contact area 29. The contact area 29 is located between the free end of the switching tube 19 and the flanged edge 22. Radially on the outside, the contact fingers have a recess 30 in which a leaf spring 31 is provided which is supported on the inner surface of the cylinder 20 and thus the contact finger 27 press the support point at 29 inwards against the fixed contact piece 16, the movement inward being effected on the one hand by the free switching tube end 19 and on the other hand by an axially extending recess 31 on the flanged edge 22 and an axially extending projection 32 on the contact finger 27, the Projection 32 is provided at the end of the contact finger 27 on the contact surface side.

Am Kolbenboden 18 ist darüberhinaus ein Blaszylinder 33 befestigt, der den äußeren Zylinder 21 in Abstand umgibt und hin zum festen Kontaktstück 16 abgebogen ist; der Blaszylinder 33 umgrenzt dort eine Öffnung 34, die als Düse für die Löschgase dient. Desweiteren sind an dem Kolbenboden 18 Kontaktblattfedern 35 befestigt, die gegen die Innenfläche des Zylinderabschnittes 14 des Abschirmtopfes 13 zum Anliegen kommen und sich vom Kolbenboden 18 in Richtung zum Topfboden des Abschirmtopfes erstrecken.On the piston head 18, a blowing cylinder 33 is also attached, which surrounds the outer cylinder 21 at a distance and is bent towards the fixed contact piece 16; the blow cylinder 33 defines an opening 34 there, which serves as a nozzle for the extinguishing gases. Furthermore, contact leaf springs 35 are attached to the piston crown 18, which come to bear against the inner surface of the cylinder section 14 of the shielding pot 13 and extend from the piston crown 18 in the direction of the pot bottom of the shielding pot.

Im Bereich zwischen dem Blaszylinder 33 und dem äußeren Zylinder 21 befinden sich im Kolbenboden 18 Öffnungen 36.In the area between the blow cylinder 33 and the outer cylinder 21 there are openings 36 in the piston crown 18.

Wenn nun eine Ausschaltung durchgeführt wird, bewegt sich das bewegliche Kontaktstück 17 zusammen mit dem Kolben- oder Topfboden 18, der Kontaktanordnung sowie dem Blaszylinder 33 in Pfeilrichtung P, wobei das Gas im Raum 37 so lange komprimiert wird, bis das Kontaktfingerteil 29 bzw. der Abbrandkontakt 24 das feste Kontaktstück 16 verläßt. Danach strömt das komprimierte Gas gemäß Pfeilrichtung P₁ in die Düse 34 und bebläst dadurch den Lichtbogen, in dem ein Teilstrom des Gases durch das bewegliche Schaltrohr 17 und ein anderer Teilstrom des Gases durch die Düse 34 abgeblasen wird.If a switch-off is now carried out, the movable contact piece 17 moves together with the piston or pot base 18, the contact arrangement and the blow cylinder 33 in the direction of arrow P, the gas in the space 37 being compressed until the contact finger part 29 or the Burn-off contact 24 leaves the fixed contact piece 16. Thereafter, the compressed gas flows in the direction of the arrow P 1 into the nozzle 34 and thereby blows the arc in which a partial flow of the gas is blown off through the movable switching tube 17 and another partial flow of the gas through the nozzle 34.

Bevor die Kontaktfinger 29 bzw. die Abbrandkontaktstücke 24 das feste Kontaktstück 16 verlassen, ist die Berührung zwischen dem Abschirmtopf 13 und den Kontaktblattfedern 35 unterbrochen, so daß der dort fließende Dauerstrom auf die Kontaktfinger 29 bzw. die Abbrandkontaktstücke 24 kommutiert wird.Before the contact fingers 29 or the erosion contact pieces 24 leave the fixed contact piece 16, the contact between the shielding pot 13 and the contact leaf springs 35 is interrupted, so that the continuous current flowing there is commutated to the contact fingers 29 or the erosion contact pieces 24.

Claims (11)

Kontaktsystem für einen Hochspannungsleistungsschalter, mit einem festen und einem beweglichen Kontaktstück und mit einem mit dem vorzugsweise als Schaltrohr ausgebildeten beweglichen Kontaktstück verbundenen Blaszylindersystem, wobei das Kontaktstück federbelastete Kontaktfinger aufweist, dadurch gekennzeichnet, daß die Kontaktfinger (27 bis 29) in einen Käfig (26) eingesetzt sind, an dessen kontaktberührungsstellenseitigen Ende wenigstens ein Abbrandkontaktstück (24) aus einem hochabbrandfesten Material befestigt ist.Contact system for a high-voltage circuit breaker, with a fixed and a movable contact piece and with a blowing cylinder system connected to the movable contact piece, which is preferably designed as a switching tube, the contact piece having spring-loaded contact fingers, characterized in that the contact fingers (27 to 29) are in a cage (26) are inserted, at the contact-contact point end of which at least one erosion contact piece (24) made of a highly erosion-resistant material is attached. Kontaktsystem nach Anspruch 1, dadurch gekennzeichnet, daß das Material Graphit ist.Contact system according to claim 1, characterized in that the material is graphite. Kontaktsystem nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der Käfig (26) radial außen durch zwei ineinandergepaßte zylindrische metallische Hüllkörpern (20, 21) begrenzt ist, deren Enden radial nach innen abgebördelt sind und zwischen sich federnd das Abbrandkontaktstück (24) festhalten.Contact system according to one of claims 1 and 2, characterized in that the cage (26) is delimited radially on the outside by two cylindrical metallic enveloping bodies (20, 21) fitted into one another, the ends of which are flanged radially inward and the erosion contact piece (24) resiliently between them. hold tight. Kontaktsystem nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Kontaktfinger (27 bis 29) fliegend in dem radial nach innen durch das freie Schaltrohrende (19) begrenzten Käfig (26) gelagert sind, wobei die Kontaktfinger (27 bis 29) mittels je einer Blattfeder (31), die sich an dem inneren Hüllkörper (20) abstützt, soweit radial nach innen gedrückt sind, daß ihre Kontaktberührungsflächen (29) im Ausschaltzustand sich innerhalb des durch den Außenumfang des festen Kontaktstückes (16) gebildeten Zylinders befinden und im Einschaltzustand gegen das feste Kontaktstück (16) gedrückt sind.Contact system according to one of the preceding claims, characterized in that the contact fingers (27 to 29) are mounted in a floating manner in the cage (26) delimited radially inward by the free switching tube end (19), the contact fingers (27 to 29) each having a Leaf spring (31), which is supported on the inner envelope body (20), so far that it is pressed radially inward that its contact contact surfaces (29) in the switched-off state are within the through the outer circumference of the fixed contact piece (16) formed cylinder and are pressed in the switched-on state against the fixed contact piece (16). Kontaktsystem, insbesondere nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Kontaktanordnung innerhalb eines geschlossenen Kunststoffgehäuses (10) untergebracht ist, an dessen Innenfläche ein Abschirmtopf (13, 14, 15) befestigt ist, dessen Topfboden (15) zur Halterung des festen Kontaktstückes (16) dient und der die Kontaktanordnung übergreift.Contact system, in particular according to one of the preceding claims, characterized in that the contact arrangement is housed within a closed plastic housing (10), on the inner surface of which a shielding pot (13, 14, 15) is attached, the pot base (15) for holding the fixed contact piece (16) and which engages over the contact arrangement. Kontaktsystem nach Anspruch 5, dadurch gekennzeichnet, daß mit dem beweglichen Schaltrohr (17) am Außenumfang des Kolbens (18) Kontaktblattfedern (35) fest verbunden sind, die im Einschaltzustand gegen die Innenfläche des Abschirmtopfes (13 bis 15) anliegen, wobei die Länge des Abschirmtopfes (13 bis 15) so bemessen ist, daß beim Ausschaltvorgang die Kontaktblattfedern (35) vom Abschirmtopf (13 bis 15) freikommen, bevor sich das bewegliche Schaltrohr (17) über die Kontaktfinger 27 und das feste Kontaktstück (16) getrennt haben.Contact system according to claim 5, characterized in that with the movable switching tube (17) on the outer circumference of the piston (18) contact leaf springs (35) are fixed, which in the switched-on state bear against the inner surface of the shielding pot (13 to 15), the length of the Shielding pot (13 to 15) is dimensioned so that the contact leaf springs (35) are released from the shielding pot (13 to 15) during the switching-off process before the movable switching tube (17) has separated via the contact fingers 27 and the fixed contact piece (16). Kontaktsystem nach Anspruch 6, dadurch gekennzeichnet, daß die Kontaktblattfedern (35) etwa auf einem Zylinder liegen und sich von der Befestigungsstelle in Richtung zum Abschirmtopfboden (15) erstrecken.Contact system according to claim 6, characterized in that the contact leaf springs (35) lie approximately on a cylinder and extend from the fastening point in the direction of the shielding pot base (15). Kontaktsystem nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß am freien Ende des Abschirmtopfes (13 bis 15) an seiner Innenfläche Fixkontaktstücke vorgesehen sind, die mit den Kontaktblattfedern (35) zusammenwirken.Contact system according to one of the preceding claims, characterized in that fixed contact pieces are provided on the inner surface of the free end of the shielding pot (13 to 15) which cooperate with the contact leaf springs (35). Kontaktsystem nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Hüllkörper (20, 21) aus unmagnetischem Stahl bestehen.Contact system according to one of the preceding claims, characterized in that the enveloping bodies (20, 21) consist of non-magnetic steel. Kontaktsystem nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Hüllkörper (20, 21) in dem dem Bördelrand entgegengesetzt liegenden Bereich miteinander verbunden, vorzugsweise verschweißt sind, so daß die freien Bördelrandenden (22, 23) geringfügig auffedern können, um das Abbrandkontaktstück (24) zu fixieren.Contact system according to one of the preceding claims, characterized in that the enveloping bodies (20, 21) are connected to one another, preferably welded, in the region opposite the flanged edge, so that the free flanged edge ends (22, 23) can spring open slightly in order to hold the erosion contact piece ( 24) to fix. Kontaktsystem nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß jeder Kontaktfinger (27) einen axialen Vorsprung (32) aufweist, der hintern einen axialen Rücksprung (31) am Bördelrand (22) des inneren Hüllkörpers (20) greift.Contact system according to one of the preceding claims, characterized in that each contact finger (27) has an axial projection (32) which, at the rear, engages in an axial recess (31) on the flanged edge (22) of the inner envelope body (20).
EP95101010A 1994-02-01 1995-01-26 Contact system for high power circuit breaker Expired - Lifetime EP0665565B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4402935A DE4402935A1 (en) 1994-02-01 1994-02-01 Contact system for a high-voltage circuit breaker
DE4402935 1994-02-01

Publications (3)

Publication Number Publication Date
EP0665565A2 true EP0665565A2 (en) 1995-08-02
EP0665565A3 EP0665565A3 (en) 1997-09-17
EP0665565B1 EP0665565B1 (en) 2000-06-28

Family

ID=6509148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101010A Expired - Lifetime EP0665565B1 (en) 1994-02-01 1995-01-26 Contact system for high power circuit breaker

Country Status (4)

Country Link
EP (1) EP0665565B1 (en)
JP (1) JPH07262890A (en)
KR (1) KR950034337A (en)
DE (2) DE4402935A1 (en)

Cited By (3)

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DE19757403A1 (en) * 1997-12-16 1999-07-01 Siemens Ag High-voltage (HV) switch contact tip lamination e.g. for HV engineering
EP0951038A1 (en) * 1998-04-14 1999-10-20 Asea Brown Boveri AG Arcing contact arrangement
EP2465125A1 (en) * 2009-08-12 2012-06-20 ABB Technology Ltd Tulip contact and electrical contact system for switching device

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JP5908268B2 (en) * 2011-12-06 2016-04-26 株式会社東芝 Gas circuit breaker

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DE19757403A1 (en) * 1997-12-16 1999-07-01 Siemens Ag High-voltage (HV) switch contact tip lamination e.g. for HV engineering
EP0951038A1 (en) * 1998-04-14 1999-10-20 Asea Brown Boveri AG Arcing contact arrangement
EP2465125A1 (en) * 2009-08-12 2012-06-20 ABB Technology Ltd Tulip contact and electrical contact system for switching device
EP2465125A4 (en) * 2009-08-12 2013-10-09 Abb Technology Ltd Tulip contact and electrical contact system for switching device

Also Published As

Publication number Publication date
DE59508500D1 (en) 2000-08-03
DE4402935A1 (en) 1995-08-03
JPH07262890A (en) 1995-10-13
EP0665565A3 (en) 1997-09-17
KR950034337A (en) 1995-12-28
EP0665565B1 (en) 2000-06-28

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