EP1207544B1 - Contact area for a circuit breaker - Google Patents

Contact area for a circuit breaker Download PDF

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Publication number
EP1207544B1
EP1207544B1 EP00811091A EP00811091A EP1207544B1 EP 1207544 B1 EP1207544 B1 EP 1207544B1 EP 00811091 A EP00811091 A EP 00811091A EP 00811091 A EP00811091 A EP 00811091A EP 1207544 B1 EP1207544 B1 EP 1207544B1
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EP
European Patent Office
Prior art keywords
contact
cover
edge
contact zone
zone according
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
EP00811091A
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German (de)
French (fr)
Other versions
EP1207544A1 (en
Inventor
Lukas Dr. Zehnder
Michael Dr. Mendik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to DE50012993T priority Critical patent/DE50012993D1/en
Priority to EP00811091A priority patent/EP1207544B1/en
Priority to US09/986,878 priority patent/US6740837B2/en
Priority to JP2001350250A priority patent/JP3777116B2/en
Priority to RU2001130982/09A priority patent/RU2273071C2/en
Priority to CN01130373.5A priority patent/CN1205635C/en
Publication of EP1207544A1 publication Critical patent/EP1207544A1/en
Application granted granted Critical
Publication of EP1207544B1 publication Critical patent/EP1207544B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7069Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by special dielectric or insulating properties or by special electric or magnetic field control properties
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7038Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by a conducting tubular gas flow enhancing nozzle

Definitions

  • the invention is based on a contact zone for a circuit breaker according to the preamble of claim 1.
  • a filled with an insulating gas circuit breaker which can be used in an electrical high-voltage network.
  • This circuit breaker has a cylindrically formed quenching chamber with a lying in its power flow contact zone.
  • two fixed Abbrandcarde arranged on a central axis are provided, which are electrically connected in the on state of the circuit breaker by a bridging contact.
  • the bridging contact is arranged here in the interior of the rotationally symmetrical Abbrandcarde.
  • the mutually facing end faces of the Abbrandcarde are covered at least partially insulating.
  • the attachment of the insulating cover is relatively expensive, since this cover can distort under the influence of prevailing in the arc zone temperatures.
  • the invention solves the problem of providing a contact zone for a circuit breaker, in which insulating covers for the end faces of the Abbrand tokene are dielectrically low and easy to assemble.
  • This invention is based on the contact zone of a rotationally symmetrical about a central axis, filled with an insulating medium quenching chamber, with at least two fixed, designed as contact rings Abbrandcarden which are electrically connected in the closed state of the quenching chamber by a centrally located and axially movable bridging contact with the mutually facing end faces at least partially covering electrically insulating covers. Between a support surface and an insulating cover, a ring-shaped annular gap with a wedge-shaped cross-section is provided for the first time, which opens in the radial direction, the edge being dielectrically shielded by means of an annular bead projecting beyond the support surface.
  • a particular advantage is the fact that the edge is always pressed by spring force against the support surface, thereby ensuring that no burned particles can get into the annular gap, where they could have a detrimental effect on the dielectric.
  • the single FIGURE shows a greatly simplified partial section through the contact zone of a circuit breaker in the off state.
  • the figure shows a greatly simplified partial section through the contact zone 1 of a circuit breaker in the off state.
  • the contact zone 1 is part of the power circuit of the circuit breaker.
  • the circuit breaker is installed in a housing, not shown, which is filled with an insulating medium.
  • This contact zone 1 is arranged rotationally symmetrical about a central axis 2.
  • An upper metallic holder 3 carries an upper contact ring 4, which is made of a erosion-resistant metallic material.
  • the upper contact ring 4 on a bearing surface 7, which merges on the side facing away from the central axis 2 dielectrically favorable rounded into the cylindrical surface 5.
  • the bearing surface 7 is delimited by a patch bead 8 which is of a low dielectric design.
  • the bead 8 merges on the side facing the central axis 2 into a region of the upper contact ring 4 formed as a nozzle groove 9.
  • an edge 10 of a cover 11 On the support surface 7, immediately adjacent to the bead 8, an edge 10 of a cover 11, and indeed this edge 10 is covered by the bead 8 against influences from the direction of the central axis 2 ago, in particular, this heat radiation and by the flow of be hot gases entrained particles.
  • the cover 11 is annular, it has in the region of the overlap of the support surface 7 has a rectangular cross-section.
  • the support surface 7 facing side of the cover 11 is shaped so that only the edge 10 rests on this.
  • an annular gap 11 a Between the bearing surface 7 and its side facing the cover 11 remains an annular gap 11 a, which has a wedge-shaped cross-section.
  • the extension 12 forms a bowl-shaped edge which extends upwards.
  • this extension 12 is not slotted, a stiffer material is used, so axially directed slots are provided in the edge.
  • an undercut 13 is attached, which snaps behind the collar 6. The cover 11 is pressed by the spring force of the extension 12 against the support surface 7 and held in position.
  • the extension 12 is also covered against direct thermal effects from the direction of the central axis 2 ago, so that its spring force, despite the high temperatures occurring in its vicinity, always maintained.
  • this contact zone 1 Mirrored to a plane perpendicular to the central axis 2 of this contact zone 1 associated, almost identically formed counter contact is arranged. It consists of a lower metallic support 14, which carries a lower contact ring 15, which is made of a erosion-resistant metallic material. In the contact ring 15 is a groove 16 pierced, one of which is remote from the central axis 2 flank provided with an internal thread 17. Perpendicular to the central axis 2, the lower contact ring 15 has a bearing surface 18, which merges on the side remote from the central axis 2 in a dielectrically favorably rounded manner into the other flank of the groove 16. On the side facing the central axis 2, the support surface 18 is bounded by a patch, bulge 19 which is of low dielectric strength.
  • the bead 19 is generally the same design as the bead 8.
  • the bead 19 goes on the central axis 2 side facing in a nozzle groove 20 formed as the region of the lower contact ring 15 via.
  • the nozzle throat 20 generally has the same cross-section as the nozzle groove 9.
  • the cover 22 is, similar to the cover 11, of annular design, it has in the region of the overlap of the support surface 18 has a rectangular cross-section.
  • the support surface 18 facing side of the cover 11 is shaped so that only the edge 21 rests on this.
  • an annular gap 22a which has a wedge-shaped cross-section.
  • On the rectangular cross-section outside a slightly elastic extension 23 is formed.
  • the extension 23 forms a bell-shaped edge, which extends downwards. If the insulating material from which the cover 22 is made sufficiently elastic, so this extension 23 is not slotted, a stiffer material is used, so axially directed slots are provided.
  • an external thread is provided on the side remote from the central axis 2, which is screwed into the internal thread 17 of the contact ring 15.
  • the cover 22 is pressed by the spring force of the extension 23 against the support surface 18 and held in position.
  • the extension 23 is also covered against direct thermal effects from the direction of the central axis 2 ago, so that its spring force, despite the high temperatures occurring in its vicinity, always maintained.
  • the cover 11 may be provided with a threaded fastener as well as the cover 22 and also the cover 22 may be held with a snap-fastening like the cover 11.
  • the variants of the cover 11, or 22 shown here can also be designed differently.
  • an annular flow gap 24 is provided here, which allows a burning of the heated gas from the arc chamber 25 in the heating volume 26 when the arc is blown, the stored in the heating volume 26 pressurized gases flow in reverse direction through the flow gap 24 in the arc space 25 and from there into the exhaust volumes 27 and 28th
  • edges 10 and 21 represent a kind of triple points, which are very effectively dielectrically shielded by the metallic beads 8 and 19, respectively.
  • the material of the covers 11 and 22 disappear somewhat as a result of thermal overload, it is, because of the bias of the extensions 12 and 23 and because of the wedge-shaped annular gap 11a or 22a between the respective support surface 7 or 18 and the cover 11 or 22 ensures that the covers 11 and 22 still rest with an edge on the respective bearing surfaces 7 and 18 respectively. In the annular gap 11a or 22a can not reach a negative dielectric effect burning particles.

Landscapes

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

Description

TECHNISCHES GEBIETTECHNICAL AREA

Die Erfindung geht aus von einer Kontaktzone für einen Leistungsschalter gemäss dem Oberbegriff des Anspruchs 1.The invention is based on a contact zone for a circuit breaker according to the preamble of claim 1.

STAND DER TECHNIKSTATE OF THE ART

Aus der Offenlegungsschrift DE 196 13 568 A1 ist ein mit einem isolierenden Gas gefüllter Leistungsschalter bekannt, der in einem elektrischen Hochspannungsnetz eingesetzt werden kann. Dieser Leistungsschalter weist eine zylindrisch ausgebildete Löschkammer auf mit einer in seiner Leistungsstrombahn liegenden Kontaktzone. In der Kontaktzone sind zwei feststehende, auf einer zentralen Achse angeordnete Abbrandkontakte vorgesehen, die im eingeschalteten Zustand des Leistungsschalters durch einen Überbrückungskontakt elektrisch leitend verbunden sind. Der Überbrückungskontakt ist hier im Innern der rotationssymmetrisch ausgebildeten Abbrandkontakte angeordnet. Um ein zu grosses radiales Auswandern der Lichtbogenfusspunkte zu verhindern, sind die einander zugewandten Stirnflächen der Abbrandkontakte zumindest teilweise isolierend abgedeckt. Das Anbringen der isolierenden Abdeckung ist vergleichsweise aufwendig, da diese Abdeckung sich unter der Einwirkung der in der Lichtbogenzone herrschenden Temperaturen verziehen kann.From the published patent application DE 196 13 568 A1 a filled with an insulating gas circuit breaker is known, which can be used in an electrical high-voltage network. This circuit breaker has a cylindrically formed quenching chamber with a lying in its power flow contact zone. In the contact zone two fixed Abbrandkontakte arranged on a central axis are provided, which are electrically connected in the on state of the circuit breaker by a bridging contact. The bridging contact is arranged here in the interior of the rotationally symmetrical Abbrandkontakte. In order to prevent excessive radial emigration of the arc root points, the mutually facing end faces of the Abbrandkontakte are covered at least partially insulating. The attachment of the insulating cover is relatively expensive, since this cover can distort under the influence of prevailing in the arc zone temperatures.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Die Erfindung, wie sie im unabhängigen Anspruch gekennzeichnet ist, löst die Aufgabe, eine Kontaktzone für einen Leistungsschalter zu schaffen, bei der isolierende Abdeckungen für die Stirnflachen der Abbrandkontakte dielektrisch günstig ausgebildet und einfach zu montieren sind.The invention, as characterized in the independent claim, solves the problem of providing a contact zone for a circuit breaker, in which insulating covers for the end faces of the Abbrandkontakte are dielectrically low and easy to assemble.

Die durch die Erfindung erreichten Vorteile sind darin zu sehen, dass die Abdeckungen trotz wärmebedingter Verformungen stets den hohen dielektrischen Anforderungen in diesem Bereich genügen können, insbesondere auch während des Abschaltvorgangs und unmittelbar danach.The advantages achieved by the invention can be seen in the fact that the covers can always meet the high dielectric requirements in this area despite heat-induced deformations, especially during the shutdown and immediately thereafter.

Diese Erfindung geht aus von der Kontaktzone einer rotationssymmetrisch um eine zentrale Achse angeordneten, mit einem isolierenden Medium gefüllten Löschkammer, mit mindestens zwei feststehenden, als Kontaktringe ausgebildeten Abbrandkontakten, welche im geschlossenen Zustand der Löschkammer durch einen zentral angeordneten und axial beweglichen Überbrückungskontakt elektrisch leitend verbunden sind, mit die einander zugewandten Stirnflächen zumindest teilweise bedeckenden elektrisch isolierenden Abdeckungen. Zwischen einer Auflagefläche und einer isolierenden Abdeckung ist hier erstmals ein sich in radialer Richtung öffnender, von einer aufliegenden Kante der Abdeckung ausgehender Ringspalt mit keilförmigem Querschnitt vorgesehen, wobei die Kante mittels einer die Auflagefläche überragenden ringförmigen Wulst dielektrisch abgeschirmt ist.This invention is based on the contact zone of a rotationally symmetrical about a central axis, filled with an insulating medium quenching chamber, with at least two fixed, designed as contact rings Abbrandkontakten which are electrically connected in the closed state of the quenching chamber by a centrally located and axially movable bridging contact with the mutually facing end faces at least partially covering electrically insulating covers. Between a support surface and an insulating cover, a ring-shaped annular gap with a wedge-shaped cross-section is provided for the first time, which opens in the radial direction, the edge being dielectrically shielded by means of an annular bead projecting beyond the support surface.

Ein besonderer Vorteil ist darin zu sehen, dass die Kante stets mit Federkraft gegen die Auflagefläche gedrückt wird, wodurch sichergestellt wird, dass keine Abbrandpartikel in den Ringspalt gelangen konnen, wo sie sich dielektrisch ungünstig auswirken könnten.A particular advantage is the fact that the edge is always pressed by spring force against the support surface, thereby ensuring that no burned particles can get into the annular gap, where they could have a detrimental effect on the dielectric.

KURZE BESCHREIBUNG DER ZEICHNUNGBRIEF DESCRIPTION OF THE DRAWING

Die einzige Figur zeigt einen stark vereinfachten Teilschnitt durch die Kontaktzone eines Leistungsschalters im ausgeschalteten Zustand.The single FIGURE shows a greatly simplified partial section through the contact zone of a circuit breaker in the off state.

Alle für das unmittelbare Verständnis der Erfindung nicht erforderlichen Elemente sind nicht dargestellt bzw. nicht beschrieben.All elements not required for the immediate understanding of the invention are not shown or described.

WEGE ZUR AUSFÜHRUNG DER ERFINDUNGWAYS FOR CARRYING OUT THE INVENTION

Die Figur zeigt einen stark vereinfachten Teilschnitt durch die Kontaktzone 1 eines Leistungsschalters im ausgeschalteten Zustand. Die Kontaktzone 1 ist ein Teil der Leistungsstrombahn des Leistungsschalters. Der Leistungsschalter ist in ein nicht dargestelltes Gehäuse eingebaut, welches mit einem isolierenden Medium gefüllt ist. Diese Kontaktzone 1 ist rotationssymmetrisch um eine zentrale Achse 2 angeordnet. Eine obere metallische Halterung 3 trägt einen oberen Kontaktring 4, der aus einem abbrandfesten metallischen Material gefertigt ist. Auf einer der zentralen Achse 2 abgewandten Zylinderfläche 5 ist ein Bund 6 vorgesehen. Senkrecht zur zentralen Achse 2 weist der obere Kontaktring 4 eine Auflagefläche 7 auf, die auf der der zentralen Achse 2 abgewandten Seite dielektrisch günstig abgerundet in die Zylinderfläche 5 übergeht. Auf der der zentralen Achse 2 zugewandten Seite ist die Auflagefläche 7 durch eine aufgesetzte, dielektrisch günstig ausgebildete Wulst 8 begrenzt. Die Wulst 8 geht auf der der zentralen Achse 2 zugewandten Seite in einen als Düsenengnis 9 ausgebildeten Bereich des oberen Kontaktrings 4 über.The figure shows a greatly simplified partial section through the contact zone 1 of a circuit breaker in the off state. The contact zone 1 is part of the power circuit of the circuit breaker. The circuit breaker is installed in a housing, not shown, which is filled with an insulating medium. This contact zone 1 is arranged rotationally symmetrical about a central axis 2. An upper metallic holder 3 carries an upper contact ring 4, which is made of a erosion-resistant metallic material. On a cylinder axis 5 facing away from the central axis 2, a collar 6 is provided. Perpendicular to the central axis 2, the upper contact ring 4 on a bearing surface 7, which merges on the side facing away from the central axis 2 dielectrically favorable rounded into the cylindrical surface 5. On the side facing the central axis 2, the bearing surface 7 is delimited by a patch bead 8 which is of a low dielectric design. The bead 8 merges on the side facing the central axis 2 into a region of the upper contact ring 4 formed as a nozzle groove 9.

Auf der Auflagefläche 7 liegt, unmittelbar neben der Wulst 8 eine Kante 10 einer Abdeckung 11 auf, und zwar wird diese Kante 10 durch die Wulst 8 gegen Einwirkungen aus der Richtung der zentralen Achse 2 her abgedeckt, insbesondere können dies Wärmestrahlungen und durch die Strömung der heissen Gase mitgerissene Partikel sein. Die Abdeckung 11 ist ringförmig ausgebildet, sie weist im Bereich der Überdeckung der Auflagefläche 7 einen rechteckigen Querschnitt auf. Die der Auflagefläche 7 zugewandte Seite der Abdeckung 11 ist so geformt, dass nur die Kante 10 auf dieser aufliegt. Zwischen der Auflagefläche 7 und der ihr zugewandten Seite der Abdeckung 11 verbleibt ein Ringspalt 11a, der einen keilförmigen Querschnitt aufweist. An den rechteckigen Querschnitt ist aussen ein etwas elastischer Fortsatz 12 angeformt. Der Fortsatz 12 bildet einen schüsselförmig ausgebildeten Rand, der sich nach oben erstreckt. Wenn das Isoliermaterial aus dem die Abdeckung 11 gefertigt ist hinreichend elastisch ist, so wird dieser Fortsatz 12 nicht geschlitzt, wird ein steiferes Material verwendet, so werden in dem Rand axial gerichtete Schlitze vorgesehen. Am oberen Ende des Fortsatzes 12 ist eine Hinterschneidung 13 angebracht, die hinter den Bund 6 einschnappt. Die Abdeckung 11 wird durch die Federkraft des Fortsatzes 12 gegen die Auflagefläche 7 gedrückt und so in Position gehalten. Der Fortsatz 12 ist ebenfalls gegen direkte thermische Einwirkungen aus der Richtung der zentralen Achse 2 her abgedeckt, sodass seine Federkraft, trotz der in seiner Nähe auftretenden hohen Temperaturen, stets erhalten bleibt.On the support surface 7, immediately adjacent to the bead 8, an edge 10 of a cover 11, and indeed this edge 10 is covered by the bead 8 against influences from the direction of the central axis 2 ago, in particular, this heat radiation and by the flow of be hot gases entrained particles. The cover 11 is annular, it has in the region of the overlap of the support surface 7 has a rectangular cross-section. The support surface 7 facing side of the cover 11 is shaped so that only the edge 10 rests on this. Between the bearing surface 7 and its side facing the cover 11 remains an annular gap 11 a, which has a wedge-shaped cross-section. On the rectangular cross-section outside a slightly elastic extension 12 is formed. The extension 12 forms a bowl-shaped edge which extends upwards. If the insulating material from which the cover 11 is made sufficiently elastic, so this extension 12 is not slotted, a stiffer material is used, so axially directed slots are provided in the edge. At the upper end of the extension 12, an undercut 13 is attached, which snaps behind the collar 6. The cover 11 is pressed by the spring force of the extension 12 against the support surface 7 and held in position. The extension 12 is also covered against direct thermal effects from the direction of the central axis 2 ago, so that its spring force, despite the high temperatures occurring in its vicinity, always maintained.

Spiegelbildlich zu einer Ebene senkrecht zur zentralen Achse 2 ist der dieser Kontaktzone 1 zugeordnete, fast identisch ausgebildete Gegenkontakt angeordnet. Er besteht aus einer unteren metallischen Halterung 14, welche einen unteren Kontaktring 15 trägt, der aus einem abbrandfesten metallischen Material gefertigt ist. In den Kontaktring 15 ist eine Nut 16 eingestochen, deren eine von der zentralen Achse 2 abgewandte Flanke mit einem Innengewinde 17 versehen ist. Senkrecht zur zentralen Achse 2 weist der untere Kontaktring 15 eine Auflagefläche 18 auf, die auf der der zentralen Achse 2 abgewandten Seite dielektrisch günstig abgerundet in die andere Flanke der Nut 16 übergeht. Auf der der zentralen Achse 2 zugewandten Seite ist die Auflagefläche 18 durch eine aufgesetzte, dielektrisch günstig ausgebildete Wulst 19 begrenzt. Die Wulst 19 ist in der Regel gleich ausgebildet wie die Wulst 8. Die Wulst 19 geht auf der der zentralen Achse 2 zugewandten Seite in einen als Düsenengnis 20 ausgebildeten Bereich des unteren Kontaktrings 15 über. Das Düsenengnis 20 weist in der Regel den gleichen Querschnitt auf wie das Düsenengnis 9.Mirrored to a plane perpendicular to the central axis 2 of this contact zone 1 associated, almost identically formed counter contact is arranged. It consists of a lower metallic support 14, which carries a lower contact ring 15, which is made of a erosion-resistant metallic material. In the contact ring 15 is a groove 16 pierced, one of which is remote from the central axis 2 flank provided with an internal thread 17. Perpendicular to the central axis 2, the lower contact ring 15 has a bearing surface 18, which merges on the side remote from the central axis 2 in a dielectrically favorably rounded manner into the other flank of the groove 16. On the side facing the central axis 2, the support surface 18 is bounded by a patch, bulge 19 which is of low dielectric strength. The bead 19 is generally the same design as the bead 8. The bead 19 goes on the central axis 2 side facing in a nozzle groove 20 formed as the region of the lower contact ring 15 via. The nozzle throat 20 generally has the same cross-section as the nozzle groove 9.

Auf der Auflagefläche 18 liegt, unmittelbar neben der Wulst 19 eine Kante 21 einer Abdeckung 22 auf, und zwar wird diese Kante 21 durch die Wulst 19 gegen Einwirkungen aus der Richtung der zentralen Achse 2 her abgedeckt, insbesondere können dies Wärmestrahlungen und durch die Strömung der heissen Gase mitgerissene Partikel sein. Die Abdeckung 22 ist, ähnlich wie die Abdeckung 11, ringförmig ausgebildet, sie weist im Bereich der Überdeckung der Auflagefläche 18 einen rechteckigen Querschnitt auf. Die der Auflagefläche 18 zugewandte Seite der Abdeckung 11 ist so geformt, dass nur die Kante 21 auf dieser aufliegt. Zwischen der Auflagefläche 18 und der ihr zugewandten Seite der Abdeckung 22 verbleibt ein Ringspalt 22a, der einen keilförmigen Querschnitt aufweist. An den rechteckigen Querschnitt ist aussen ein etwas elastischer Fortsatz 23 angeformt. Der Fortsatz 23 bildet einen glockenförmig ausgebildeten Rand, der sich nach unten erstreckt. Wenn das Isoliermaterial aus dem die Abdeckung 22 gefertigt ist hinreichend elastisch ist, so wird dieser Fortsatz 23 nicht geschlitzt, wird ein steiferes Material verwendet, so werden axial gerichtete Schlitze vorgesehen.On the support surface 18, immediately adjacent to the bead 19, an edge 21 of a cover 22, and indeed this edge 21 is covered by the bead 19 against influences from the direction of the central axis 2 ago, in particular, this heat radiation and by the flow of be hot gases entrained particles. The cover 22 is, similar to the cover 11, of annular design, it has in the region of the overlap of the support surface 18 has a rectangular cross-section. The support surface 18 facing side of the cover 11 is shaped so that only the edge 21 rests on this. Between the support surface 18 and its side facing the cover 22 remains an annular gap 22a, which has a wedge-shaped cross-section. On the rectangular cross-section outside a slightly elastic extension 23 is formed. The extension 23 forms a bell-shaped edge, which extends downwards. If the insulating material from which the cover 22 is made sufficiently elastic, so this extension 23 is not slotted, a stiffer material is used, so axially directed slots are provided.

Am unteren Ende des Fortsatzes 23 ist auf der der zentralen Achse 2 abgewandten Seite ein Aussengewinde vorgesehen, welches in das Innengewinde 17 des Kontaktrings 15 eingeschraubt ist. Die Abdeckung 22 wird durch die Federkraft des Fortsatzes 23 gegen die Auflagefläche 18 gedrückt und so in Position gehalten. Der Fortsatz 23 ist ebenfalls gegen direkte thermische Einwirkungen aus der Richtung der zentralen Achse 2 her abgedeckt, sodass seine Federkraft, trotz der in seiner Nähe auftretenden hohen Temperaturen, stets erhalten bleibt.At the lower end of the extension 23, an external thread is provided on the side remote from the central axis 2, which is screwed into the internal thread 17 of the contact ring 15. The cover 22 is pressed by the spring force of the extension 23 against the support surface 18 and held in position. The extension 23 is also covered against direct thermal effects from the direction of the central axis 2 ago, so that its spring force, despite the high temperatures occurring in its vicinity, always maintained.

Die Abdeckung 11 kann ebenso wie die Abdeckung 22 mit einer Gewindebefestigung versehen sein und ebenso kann die Abdeckung 22 mit einer Schnappbefestigung wie die Abdeckung 11 gehalten sein. Die hier gezeigten Varianten der Abdeckung 11, bzw. 22 können auch konstruktiv anders gestaltet werden. Zwischen den beiden Abdeckungen 11 und 12 ist hier ein ringförmiger Strömungsspalt 24 vorgesehen, der bei brennendem Lichtbogen eine Strömung des aufgeheizten Gases aus dem Lichtbogenraum 25 in das Heizvolumen 26 ermöglicht, wenn der Lichtbogen beblasen wird, so strömen die im Heizvolumen 26 gespeicherten druckbeaufschlagten Gase in umgekehrter Richtung durch den Strömungsspalt 24 in den Lichtbogenraum 25 ein und von dort weiter in die Auspuffvolumina 27 und 28.The cover 11 may be provided with a threaded fastener as well as the cover 22 and also the cover 22 may be held with a snap-fastening like the cover 11. The variants of the cover 11, or 22 shown here can also be designed differently. Between the two covers 11 and 12, an annular flow gap 24 is provided here, which allows a burning of the heated gas from the arc chamber 25 in the heating volume 26 when the arc is blown, the stored in the heating volume 26 pressurized gases flow in reverse direction through the flow gap 24 in the arc space 25 and from there into the exhaust volumes 27 and 28th

Es ist auch möglich, die beiden Abdeckungen 11 und 22 aus einem Stück herzustellen und statt des Strömungsspalts 24 dann an den entsprechenden Stellen radiale Bohrungen in dieses monolithische Stück einzubringen. Die Befestigung dieses Stücks könnte dann mit Hilfe einer der vorab beschriebenen Halterungen eventuell nur an einem der Kontaktringe 4 oder 15 erfolgen.It is also possible to produce the two covers 11 and 22 in one piece and then introduce instead of the flow gap 24 at the appropriate locations radial holes in this monolithic piece. The attachment of this piece could then be done with the help of one of the previously described brackets possibly only on one of the contact rings 4 or 15.

Die Kanten 10 und 21 stellen eine Art Tripelpunkte dar, die durch die metallischen Wülste 8 bzw. 19 sehr wirkungsvoll dielektrisch abgeschirmt werden. Sollte das Material der Abdeckungen 11 und 22 infolge thermischer Überlastung etwas schwinden, so ist, wegen der Vorspannung der Fortsätze 12 bzw. 23 und wegen des keilförmig ausgebildeten Ringspalts 11a bzw. 22a zwischen der jeweiligen Auflagefläche 7 bzw. 18 und der Abdeckung 11 bzw. 22 sichergestellt, dass die Abdeckungen 11 bzw. 22 trotzdem mit einer Kante auf den jeweiligen Auflageflächen 7 bzw. 18 aufliegen. In den Ringspalt 11a bzw. 22a können keine sich dielektrisch negativ auswirkenden Abbrandpartikel gelangen.The edges 10 and 21 represent a kind of triple points, which are very effectively dielectrically shielded by the metallic beads 8 and 19, respectively. Should the material of the covers 11 and 22 disappear somewhat as a result of thermal overload, it is, because of the bias of the extensions 12 and 23 and because of the wedge-shaped annular gap 11a or 22a between the respective support surface 7 or 18 and the cover 11 or 22 ensures that the covers 11 and 22 still rest with an edge on the respective bearing surfaces 7 and 18 respectively. In the annular gap 11a or 22a can not reach a negative dielectric effect burning particles.

BEZEICHNUNGSLISTENAME LIST

11
Kontaktzonecontact zone
22
zentrale Achsecentral axis
33
obere Halterungupper bracket
44
oberer Kontaktringupper contact ring
55
Zylinderflächecylindrical surface
66
BundFederation
77
Auflageflächebearing surface
88th
Wulstbead
99
Düsenengnisnozzle constriction
1010
Kanteedge
11a11a
Ringspaltannular gap
1111
Abdeckungcover
1212
Fortsatzextension
1313
Hinterschneidungundercut
1414
untere Halterunglower bracket
1515
unterer Kontaktringlower contact ring
1616
Nutgroove
1717
Innengewindeinner thread
1818
Auflageflächebearing surface
1919
Wulstbead
2020
Düsenengnisnozzle constriction
2121
Kanteedge
2222
Abdeckungcover
22a22a
Ringspaltannular gap
2323
Fortsatzextension
2424
Strömungsspaltflow gap
2525
LichtbogenraumArcing area
2626
Heizvolumenheating volume
27, 2827, 28
Auspuffvolumenexhaust volume

Claims (6)

  1. Contact zone (1) of a quenching chamber which is arranged rotationally symmetrically about a central axis (2) and is filled with an insulating medium, having at least two stationary consumable contacts which are in the form of contact rings (4, 15) and which, when the quenching chamber is closed, are electrically conductively connected by means of a bridging contact which is arranged centrally and can move axially and having electrically insulating covers (11, 22), which at least partially cover mutually facing end surfaces of the contact rings (4, 15), characterized
    - in that a wedge-shaped annular gap (11a, 22a), which is open in the radial direction and originates from a contact-making edge (10, 21) of the cover (11, 22), is provided between a contact-making surface (7, 18) of a contact ring (4, 15) and an insulating cover (11, 22) and
    - in that the edge (10, 21) is dielectrically shielded by means of an annular bead (8, 19) which projects beyond the contact-making surface (7, 18).
  2. Contact zone according to Claim 1, characterized
    - in that the edge (10, 21) is arranged in the immediate vicinity of the annular bead (8, 19).
  3. Contact zone according to one of Claims 1 or 2,
    characterized
    - in that the cover (11, 22) has a rectangular cross section in the region where it covers the contact-making surface (7, 18) and
    - in that an elastic projection (12, 23) is integrally formed as a rim, which extends in the axial direction, externally on this rectangular cross section.
  4. Contact zone according to Claim 3, characterized
    - in that the rim is provided with means which allow the cover (11, 22) to be connected mechanically to the contact ring (4, 15), and
    - in that the mechanical connection is made Such that the edge (10, 21) is always pressed in a sprung manner against the contact-making surface (7, 18)
  5. Contact zone according to Claim 4, characterized
    - in that the mechanical connection is designed to be detachable.
  6. Contact zone according to Claim 5, characterized
    - in that a snap-action apparatus or a screw connection is provided as the mechanical connection.
EP00811091A 2000-11-17 2000-11-17 Contact area for a circuit breaker Expired - Lifetime EP1207544B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE50012993T DE50012993D1 (en) 2000-11-17 2000-11-17 Contact zone for a circuit breaker
EP00811091A EP1207544B1 (en) 2000-11-17 2000-11-17 Contact area for a circuit breaker
US09/986,878 US6740837B2 (en) 2000-11-17 2001-11-13 Contact zone for a power breaker
JP2001350250A JP3777116B2 (en) 2000-11-17 2001-11-15 Contact area for power breakers
RU2001130982/09A RU2273071C2 (en) 2000-11-17 2001-11-16 Contact region of power switch
CN01130373.5A CN1205635C (en) 2000-11-17 2001-11-19 Contact area for power switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00811091A EP1207544B1 (en) 2000-11-17 2000-11-17 Contact area for a circuit breaker

Publications (2)

Publication Number Publication Date
EP1207544A1 EP1207544A1 (en) 2002-05-22
EP1207544B1 true EP1207544B1 (en) 2006-06-14

Family

ID=8175036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00811091A Expired - Lifetime EP1207544B1 (en) 2000-11-17 2000-11-17 Contact area for a circuit breaker

Country Status (6)

Country Link
US (1) US6740837B2 (en)
EP (1) EP1207544B1 (en)
JP (1) JP3777116B2 (en)
CN (1) CN1205635C (en)
DE (1) DE50012993D1 (en)
RU (1) RU2273071C2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1392729B1 (en) * 2009-01-12 2012-03-16 Bticino Spa HIGH PERFORMANCE ELECTRICAL SWITCH
US9012800B2 (en) 2010-02-04 2015-04-21 Mitsubishi Electric Corporation Gas circuit breaker
US9552942B2 (en) * 2012-03-16 2017-01-24 Mitsubishi Electric Corporation Gas circuit breaker
WO2015008515A1 (en) * 2013-07-19 2015-01-22 株式会社日立製作所 Gas circuit breaker
JP6289856B2 (en) * 2013-10-16 2018-03-07 株式会社東芝 Gas circuit breaker
JP6382543B2 (en) * 2014-03-24 2018-08-29 株式会社東芝 Gas circuit breaker
JP6320106B2 (en) * 2014-03-25 2018-05-09 株式会社東芝 Gas circuit breaker

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8125499U1 (en) * 1981-08-28 1986-07-31 Siemens AG, 1000 Berlin und 8000 München Gas switch
DE3424966A1 (en) * 1984-07-06 1986-01-16 Siemens AG, 1000 Berlin und 8000 München Contact arrangement for gas-flow switches
DE3431288A1 (en) * 1984-08-23 1986-03-06 Siemens AG, 1000 Berlin und 8000 München CONTACT ARRANGEMENT FOR LOW VOLTAGE CIRCUIT BREAKERS WITH A TWO-ARM CONTACT LEVER
EP0270895A1 (en) * 1986-12-08 1988-06-15 BBC Brown Boveri AG Pressurized-gas switch
JPS63211532A (en) * 1987-02-26 1988-09-02 三菱電機株式会社 Gas switch
FR2688625B1 (en) * 1992-03-13 1997-05-09 Merlin Gerin CONTACT OF A MOLDED BOX CIRCUIT BREAKER
US5351024A (en) * 1993-03-08 1994-09-27 Eaton Corporation Electrical contactor and interrupter employing a rotary disc
DE19613568A1 (en) * 1996-04-04 1997-10-09 Asea Brown Boveri Circuit breaker

Also Published As

Publication number Publication date
CN1205635C (en) 2005-06-08
EP1207544A1 (en) 2002-05-22
CN1354488A (en) 2002-06-19
DE50012993D1 (en) 2006-07-27
JP3777116B2 (en) 2006-05-24
JP2002203463A (en) 2002-07-19
RU2273071C2 (en) 2006-03-27
US6740837B2 (en) 2004-05-25
US20020060203A1 (en) 2002-05-23

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