EP2273524B1 - Earthing switch, in particular for a medium voltage switching assembly - Google Patents

Earthing switch, in particular for a medium voltage switching assembly Download PDF

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Publication number
EP2273524B1
EP2273524B1 EP10161962.5A EP10161962A EP2273524B1 EP 2273524 B1 EP2273524 B1 EP 2273524B1 EP 10161962 A EP10161962 A EP 10161962A EP 2273524 B1 EP2273524 B1 EP 2273524B1
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EP
European Patent Office
Prior art keywords
earthing switch
contact
closed position
fixed contact
arcing
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.)
Revoked
Application number
EP10161962.5A
Other languages
German (de)
French (fr)
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EP2273524A3 (en
EP2273524A2 (en
Inventor
Manfred Nafz
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Schneider Electric Sachsenwerk GmbH
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Schneider Electric Sachsenwerk GmbH
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Application filed by Schneider Electric Sachsenwerk GmbH filed Critical Schneider Electric Sachsenwerk GmbH
Publication of EP2273524A2 publication Critical patent/EP2273524A2/en
Publication of EP2273524A3 publication Critical patent/EP2273524A3/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/003—Earthing switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
    • 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
    • H01H1/42—Knife-and-clip contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/28—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact

Definitions

  • the invention relates to a grounding switch according to the preamble of claim 1.
  • a corresponding lever disconnector is from the DE 89 07 091 U1 known.
  • Known medium-voltage switchgear often contain earthing switches, which ensure the grounding of certain components of the switchgear in a closed position.
  • Known earthing switches have a fixed contact and a movable contact, wherein the movable contact can be mechanically moved from an open to the closed position and vice versa.
  • the object of the invention is to provide an electrical grounding switch, which reduces the possibility of welding the contacts.
  • the invention solves this problem by a grounding switch according to claim 1.
  • the electrical earthing switch according to the invention is provided with a fixed contact and a movable contact.
  • the movable contact is movable from an open to a closed position and vice versa.
  • the fixed contact and the movable contact burn-off contacts of an electrically conductive material having a high melting point.
  • an electrical connection is made via surfaces which differ locally from the areas of the consumable contacts in which the base points of the arc are located. This ensures that in the closed position of the earthing switch no welding between the fixed contact and the movable contact arise.
  • the Abbrandcarde are designed and / or arranged such that the bases of an event of movement of the movable contact optionally forming arc in determinable areas of Abbrandcarde, and that are those areas of Abbrandcarde in which the arc points are not touching in the closed position of the earthing switch.
  • the areas of the Abbrand tokene in which the foot points of the arc are formed substantially as crests of the Abbrandcarde. Such crests have been found to be particularly advantageous bases for arcing.
  • FIG. 1 shows a schematic side view of an embodiment of a grounding switch according to the invention in an open position
  • FIGS. 2a, 2b show a side view and a plan view of the earthing switch of FIG. 1 in an intermediate position
  • FIGS. 3a, 3b show a side view and a plan view of the earthing switch of FIG. 1 in a closed position.
  • grounding switch 10 is shown, with which an electrical connection to earth or ground can be made or interrupted by means of a mechanical operation.
  • the grounding switch 10 can be used in particular in a medium-voltage switchgear.
  • the earthing switch 10 has a fixed contact 11 and a movable contact 12. Are the two contacts 11, 12 arranged separately from each other, as shown in the FIG. 1 If this is the case, then there is no electrical connection. In the FIG. 1 Therefore, the open position of the earthing switch 10 is shown. In contrast, the two contacts 11, 12 are arranged so that they touch, as in the FIGS. 3a, 3b the case is, so there is an electrical connection. In the FIGS. 3a, 3b Therefore, the closed position of the earthing switch 10 is shown.
  • the fixed contact 11 is attached via an insulating holder 14 to a carrier 15.
  • the fixed contact 11 has an approximately U-shaped form and consists of metal, for example copper.
  • a first leg 17 of the fixed contact 11 is preferably mounted approximately perpendicular to the bracket 14.
  • a second leg 19 is present, which is aligned approximately parallel to the first leg 17.
  • the second shekel 19 is arranged on the holder 14 facing side of the first leg 17. Furthermore, the second leg 19 is shorter than the first leg, so that the free end of the second leg 19 has a distance from the holder 14.
  • a burn-off contact 21 is provided, which consists of an electrically conductive material with the highest possible melting point.
  • the erosion contact 21 is formed in the shape of a thimble, attached to the first leg 17 and aligned in the direction of the first leg 17.
  • An approximately hemispherical formed dome 22 of the AbbrandWallets 21 is above the first leg 17 via.
  • the movable contact 12 is held in a manner not shown pivotable about an axis 24 on the carrier 15.
  • the movable contact 12 can from the in the FIG. 1 shown position by about 90 degrees in the in FIG. 3a shown position and pivoted vice versa.
  • the movable contact 12 consists of two knife-like rods 26, 27. It is this particular to the top view of FIG. 2b directed.
  • the two rods 26, 27 are made of metal, in particular of copper.
  • the two rods 26, 27 are configured similarly and arranged parallel to each other and aligned.
  • the two rods 26, 27 preferably have a U-shaped cross section, wherein the Point legs in opposite directions. This is in the plan view of FIG. 3b indicated by dashed lines.
  • each rod 26 27 each have a Abbrandness 28, 29 is attached, which consist of an electrically conductive material with the highest possible melting point.
  • the Abbrandcarde 28, 29 are each formed in the shape of a thimble and preferably approximately perpendicular to the longitudinal direction of the rods 26, 27 aligned.
  • the approximately hemispherical formed peaks 30, 31 of the AbbrandWallete 28, 29 are about the rods 26, 27 and have approximately in the direction of the AbbrandWallet 21 of the fixed contact eleventh
  • the distance between the two rods 26, 27 of the movable contact 12 in the direction of the axis 24 corresponds to the width of the second leg 19 of the fixed contact 11 in the same direction. This is evident in particular from the plan views of FIGS. 2b . 3b , In the closed position of the earthing switch 10 according to the FIGS. 3a, 3b is thus the second leg 19 of the fixed contact 11 between the two rods 26, 27 of the movable contact 12. The second leg 19 is in such a way on the two rods 26, 27 that an electrical contact is present.
  • the movable contact 12 is pivoted about the axis 24 in the direction of the fixed contact 11 by a mechanical actuation, which may be caused by a drive. At some point, the movable contact 12 then reaches the in the FIGS. 2a, 2 B shown intermediate position. In this intermediate position between the open position of the FIG. 1 and the closed position of FIGS. 3a, 3b the distance between the movable contact 12 of the fixed contact 11 has become so low that a current-carrying arc is formed.
  • FIG. 2b two arcs 33, 34 are shown, of which the first arc 33 from the AbbrandWallet 28 of the first rod 26 to the AbbrandWallet 22 of the fixed contact 11 and the second arc 34 from the AbbrandWallet 29 of the second rod 27 to the Abbrandcard 22 of the fixed contact 11th extends.
  • the above-mentioned current-carrying arc is formed by at least one of these two arcs 33, 34. Subsequently, it is assumed that only the arc 33 is present. It is understood that the following explanations apply in a corresponding manner for the arc 34, if it is present.
  • the base of the arc 33 is due to the configuration of Abbrand tokene 21, 28 on the top 30 of Abbrand tokens 28 of the movable contact 12 and on the top 22 of the Abbrand tokens 21 of the fixed contact 11. This results in particular from the FIG. 2a , The explained areas of the Abbrand tokene 21, 28 are thus present on the knobs 22, 30 of the Abbrandcarde 21, 28th
  • FIGS. 3a, 3b can be taken that also the crests 30, 31 of the AbbrandWallete 28, 29 of the movable contact 12 locally in a completely different Area of the earthing switch 10 are located as the top 22 of the AbbrandWallets 21 of the fixed contact 11.
  • the tips 30, 31 of the AbbrandWallete 28, 29 of the movable contact 12 and the top 22 of the AbbrandWallets 21 of the fixed contact 11 in the closed position of the earthing switch 10 can not touch.
  • the fixed contact 11 and the movable contact 12 may be formed differently.
  • the movable contact 12 may also transition from an open position to a closed position of the earthing switch 10 by means of a different movement, for example by means of a linear movement.

Landscapes

  • Gas-Insulated Switchgears (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Description

Die Erfindung betrifft einen Erdungsschalter nach dem Oberbegriff des Anspruchs 1. Ein entsprechender Hebeltrennschalter ist aus der DE 89 07 091 U1 bekannt.The invention relates to a grounding switch according to the preamble of claim 1. A corresponding lever disconnector is from the DE 89 07 091 U1 known.

Bekannte Mittelspannungsschaltanlagen enthalten häufig Erdungsschalter, die in einer geschlossenen Stellung die Erdung von bestimmten Komponenten der Schaltanlage sicherstellen. Bekannte Erdungsschalter weisen einen Festkontakt und einen beweglichen Kontakt auf, wobei der bewegliche Kontakt mechanisch von einer geöffneten in die geschlossene Stellung und umgekehrt bewegt werden kann.Known medium-voltage switchgear often contain earthing switches, which ensure the grounding of certain components of the switchgear in a closed position. Known earthing switches have a fixed contact and a movable contact, wherein the movable contact can be mechanically moved from an open to the closed position and vice versa.

Beim Übergang in die geschlossene Stellung ist es möglich, dass - bevor der Erdungsschalter seine geschlossene Stellung erreicht - ein Lichtbogen zwischen dem Festkontakt und dem beweglichen Kontakt entsteht. Dies hat zur Folge, dass es zu Aufschmelzungen des beweglichen und des Festkontakts kommt. Dies kann dazu führen, dass im geschlossenen Zustand des Erdungsschalters die nunmehr aneinander anliegenden Kontakte zumindest in einem gewissen Umfang miteinander verschweißen. Soll danach der Erdungsschalter wieder geöffnet werden, so erfordert dies einen erhöhten mechanischen Aufwand, um die entstandenen Verschweißungen wieder aufzubrechen. Im Extremfall ist die Verschweißung so stark, dass der Erdungsschalter nicht mehr betätigt werden kann.When moving to the closed position, it is possible that - before the earthing switch reaches its closed position - an arc between the fixed contact and the moving contact arises. This has the consequence that it comes to melting of the movable and the fixed contact. This can lead to the fact that in the closed state of the earthing switch, the now adjacent contacts weld together at least to a certain extent. If the earthing switch is then to be opened again, this requires an increased mechanical outlay in order to break up the resulting welds again. In extreme cases, the welding is so strong that the earthing switch can no longer be operated.

Aufgabe der Erfindung ist es, einen elektrischen Erdungsschalter zu schaffen, der die Möglichkeit eines Verschweißens der Kontakte vermindert.The object of the invention is to provide an electrical grounding switch, which reduces the possibility of welding the contacts.

Die Erfindung löst diese Aufgabe durch einen Erdungsschalter nach dem Anspruch 1.The invention solves this problem by a grounding switch according to claim 1.

Der erfindungsgemäße elektrische Erdungsschalter ist mit einem Festkontakt und einem beweglichen Kontakt versehen. Der bewegliche Kontakt ist von einer geöffneten in eine geschlossene Stellung und umgekehrt bewegbar. Erfindungsgemäß weisen der Festkontakt und der bewegliche Kontakt Abbrandkontakte aus einem elektrisch leitfähigen Material mit einem hohen Schmelzpunkt auf. Bei der Erfindung ist in der geschlossenen Stellung des Erdungsschalters eine elektrische Verbindung über Flächen geführt, die sich von den Bereichen der Abbrandkontakte, in denen sich die Fußpunkte des Lichtbogens befinden, örtlich unterscheiden. Damit wird gewährleistet, dass in der geschlossenen Stellung des Erdungsschalters keine Verschweißungen zwischen dem Festkontakt und dem beweglichen Kontakt entstehen.The electrical earthing switch according to the invention is provided with a fixed contact and a movable contact. The movable contact is movable from an open to a closed position and vice versa. According to the invention, the fixed contact and the movable contact burn-off contacts of an electrically conductive material having a high melting point. In the invention, in the closed position of the earthing switch, an electrical connection is made via surfaces which differ locally from the areas of the consumable contacts in which the base points of the arc are located. This ensures that in the closed position of the earthing switch no welding between the fixed contact and the movable contact arise.

Bei einer besonders vorteilhaften Weiterbildung der Erfindung sind die Abbrandkontakte derart ausgebildet und/oder angeordnet, dass sich die Fußpunkte eines sich bei einer Bewegung des beweglichen Kontakts gegebenenfalls ausbildenden Lichtbogens in bestimmbaren Bereichen der Abbrandkontakte befinden, und dass sich diejenigen Bereiche der Abbrandkontakte, in denen sich die Fußpunkte des Lichtbogens befinden, in der geschlossenen Stellung des Erdungsschalters nicht berühren. Wenn somit beim Übergang in die geschlossene Stellung des Erdungsschalters durch den Lichtbogen irgendwelche Aufschmelzungen an den Abbrandkontakten entstehen, so hat dies bei dem erfindungsgemäßen Erdungsschalter keine Folgen. Dies ergibt sich daraus, dass sich die Bereiche der Aufschmelzungen in der geschlossenen Stellung des Erdungsschalters nicht berühren. Damit können sich die Aufschmelzungen der Abbrandkontakte in der geschlossenen Stellung auch nicht miteinander verschweißen. Bei dem erfindungsgemäßen Erdungsschalter können somit keine Verschweißungen des Festkontakts und des beweglichen Kontakts entstehen. Der erfindungsgemäße elektrische Erdungsschalter kann damit ohne einen größeren mechanischen Aufwand wieder geöffnet werden.In a particularly advantageous embodiment of the invention, the Abbrandkontakte are designed and / or arranged such that the bases of an event of movement of the movable contact optionally forming arc in determinable areas of Abbrandkontakte, and that are those areas of Abbrandkontakte in which the arc points are not touching in the closed position of the earthing switch. Thus, when transitioning into the Closed position of the earthing switch caused by the arc any melting at the Abbrandkontakten, so this has no consequences in the earthing switch according to the invention. This is because the areas of the fuses do not touch in the closed position of the earthing switch. Thus, the melting of the Abbrandkontakte in the closed position can not weld together. In the earthing switch according to the invention thus no welding of the fixed contact and the movable contact can arise. The inventive electrical grounding switch can thus be reopened without a major mechanical effort.

Die Vermeidung von Verschweißungen zwischen dem Festkontakt und dem beweglichen Kontakt bringt somit den wesentlichen Vorteil mit sich, dass beim Öffnen des Erdungsschalters kein mechanischer Aufwand zum Aufbrechen derartiger Verschweißungen erforderlich ist. Der für die Betätigung des Erdungsschalters erforderliche Antrieb muss damit noch geringere mechanische Bedingungen erfüllen als vergleichbare bekannte Erdungsschalter.The avoidance of welding between the fixed contact and the movable contact thus brings the significant advantage that when opening the earthing switch no mechanical effort to break such welds is required. The required for the operation of the earthing switch drive must thus meet even lower mechanical conditions than comparable known earthing switch.

Bei einer Ausgestaltung der Erfindung sind die Bereiche der Abbrandkontakte, in denen sich die Fußpunkte des Lichtbogens befinden, im wesentlichen als Kuppen der Abbrandkontakte ausgebildet. Derartige Kuppen haben sich als besonders vorteilhafte Fußpunkte für Lichtbögen herausgestellt.In one embodiment of the invention, the areas of the Abbrandkontakte in which the foot points of the arc are formed substantially as crests of the Abbrandkontakte. Such crests have been found to be particularly advantageous bases for arcing.

Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung, die in den Figuren der Zeichnung dargestellt sind. Dabei bilden alle beschriebenen oder dargestellten Merkmale für sich oder in beliebiger Kombination den Gegenstand der Erfindung, unabhängig von ihrer Zusammenfassung in den Patentansprüchen oder deren Rückbeziehung sowie unabhängig von ihrer Formulierung bzw. Darstellung in der Beschreibung bzw. in der Zeichnung.Other features, applications and advantages of the invention will become apparent from the following description of embodiments of the invention, which are illustrated in the figures of the drawing. All described or illustrated features, alone or in any combination form the subject matter of the invention, regardless of their summary in the claims or their dependency and regardless of their formulation or representation in the description or in the drawing.

Figur 1 zeigt eine schematische Seitenansicht eines Ausführungsbeispiels eines erfindungsgemäßen Erdungsschalters in einer geöffneten Stellung, Figuren 2a, 2b zeigen eine Seitenansicht und eine Draufsicht auf den Erdungsschalter der Figur 1 in einer Zwischenstellung, und Figuren 3a, 3b zeigen eine Seitenansicht und eine Draufsicht auf den Erdungsschalter der Figur 1 in einer geschlossenen Stellung. FIG. 1 shows a schematic side view of an embodiment of a grounding switch according to the invention in an open position, FIGS. 2a, 2b show a side view and a plan view of the earthing switch of FIG. 1 in an intermediate position, and FIGS. 3a, 3b show a side view and a plan view of the earthing switch of FIG. 1 in a closed position.

In der Figur 1 ist ein Erdungsschalter 10 dargestellt, mit dem eine elektrische Verbindung nach Erde bzw. Masse mittels einer mechanischen Betätigung hergestellt oder unterbrochen werden kann. Der Erdungsschalter 10 kann insbesondere bei einer Mittelspannungsschaltanlage zum Einsatz kommen.In the FIG. 1 a grounding switch 10 is shown, with which an electrical connection to earth or ground can be made or interrupted by means of a mechanical operation. The grounding switch 10 can be used in particular in a medium-voltage switchgear.

Der Erdungsschalter 10 weist einen Festkontakt 11 und einen beweglichen Kontakt 12 auf. Sind die beiden Kontakte 11, 12 getrennt voneinander angeordnet, wie dies in der Figur 1 der Fall ist, so liegt keine elektrische Verbindung vor. In der Figur 1 ist daher die geöffnete Stellung des Erdungsschalters 10 dargestellt. Sind die beiden Kontakte 11, 12 hingegen derart angeordnet, dass sie sich berühren, wie dies in den Figuren 3a, 3b der Fall ist, so ist eine elektrische Verbindung vorhanden. In den Figuren 3a, 3b ist daher die geschlossene Stellung des Erdungsschalters 10 dargestellt.The earthing switch 10 has a fixed contact 11 and a movable contact 12. Are the two contacts 11, 12 arranged separately from each other, as shown in the FIG. 1 If this is the case, then there is no electrical connection. In the FIG. 1 Therefore, the open position of the earthing switch 10 is shown. In contrast, the two contacts 11, 12 are arranged so that they touch, as in the FIGS. 3a, 3b the case is, so there is an electrical connection. In the FIGS. 3a, 3b Therefore, the closed position of the earthing switch 10 is shown.

Der Festkontakt 11 ist über eine isolierende Halterung 14 an einem Träger 15 befestigt. Gemäß der Seitenansicht der Figur 1 besitzt der Festkontakt 11 eine etwa U-förmige Gestalt und besteht aus Metall, beispielsweise aus Kupfer. Mit einem ersten Schenkel 17 ist der Festkontakt 11 vorzugsweise etwa lotrecht an der Halterung 14 angebracht. Über eine Querverbindung 18 ist ein zweiter Schenkel 19 vorhanden, der etwa parallel zum ersten Schenkel 17 ausgerichtet ist. Der zweite Schekel 19 ist auf der der Halterung 14 zugewandten Seite des ersten Schenkels 17 angeordnet. Weiterhin ist der zweite Schenkel 19 kürzer als der erste Schenkel, so dass das freie Ende des zweiten Schenkels 19 einen Abstand zu der Halterung 14 aufweist.The fixed contact 11 is attached via an insulating holder 14 to a carrier 15. According to the side view of FIG. 1 the fixed contact 11 has an approximately U-shaped form and consists of metal, for example copper. With a first leg 17 of the fixed contact 11 is preferably mounted approximately perpendicular to the bracket 14. Via a transverse connection 18, a second leg 19 is present, which is aligned approximately parallel to the first leg 17. The second shekel 19 is arranged on the holder 14 facing side of the first leg 17. Furthermore, the second leg 19 is shorter than the first leg, so that the free end of the second leg 19 has a distance from the holder 14.

Im Übergangsbereich von dem ersten Schenkel 17 zu der Querverbindung 18 ist ein Abbrandkontakt 21 vorgesehen, der aus einem elektrisch leitfähigen Material mit einem möglichst hohen Schmelzpunkt besteht. Der Abbrandkontakt 21 ist in der Form eines Fingerhuts ausgebildet, auf den ersten Schenkel 17 aufgesteckt und in Richtung des ersten Schenkels 17 ausgerichtet. Eine etwa halbkugelförmig ausgebildete Kuppe 22 des Abbrandkontakts 21 steht über den ersten Schenkel 17 über.In the transition region from the first leg 17 to the cross-connection 18, a burn-off contact 21 is provided, which consists of an electrically conductive material with the highest possible melting point. The erosion contact 21 is formed in the shape of a thimble, attached to the first leg 17 and aligned in the direction of the first leg 17. An approximately hemispherical formed dome 22 of the Abbrandkontakts 21 is above the first leg 17 via.

Der bewegliche Kontakt 12 ist in nicht-dargestellter Weise um eine Achse 24 schwenkbar an dem Träger 15 gehalten. Der bewegliche Kontakt 12 kann aus der in der Figur 1 gezeigten Stellung um etwa 90 Grad in die in der Figur 3a gezeigte Stellung und umgekehrt geschwenkt werden.The movable contact 12 is held in a manner not shown pivotable about an axis 24 on the carrier 15. The movable contact 12 can from the in the FIG. 1 shown position by about 90 degrees in the in FIG. 3a shown position and pivoted vice versa.

Der bewegliche Kontakt 12 besteht aus zwei messerartigen Stangen 26, 27. Es wird hierzu insbesondere auf die Draufsicht der Figur 2b verwiesen. Die beiden Stangen 26, 27 bestehen aus Metall, insbesondere aus Kupfer. Die beiden Stangen 26, 27 sind gleichartig ausgestaltet und parallel zueinander angeordnet und ausgerichtet. Die beiden Stangen 26, 27 besitzen vorzugsweise einen U-förmigen Querschnitt, wobei die Schenkel in entgegengesetzte Richtungen weisen. Dies ist in der Draufsicht der Figur 3b gestrichelt angedeutet.The movable contact 12 consists of two knife-like rods 26, 27. It is this particular to the top view of FIG. 2b directed. The two rods 26, 27 are made of metal, in particular of copper. The two rods 26, 27 are configured similarly and arranged parallel to each other and aligned. The two rods 26, 27 preferably have a U-shaped cross section, wherein the Point legs in opposite directions. This is in the plan view of FIG. 3b indicated by dashed lines.

An den freien Enden der beiden Stangen 26, 27 ist jeweils ein Abbrandkontakt 28, 29 angebracht, die aus einem elektrisch leitfähigen Material mit einem möglichst hohen Schmelzpunkt bestehen. Die Abbrandkontakte 28, 29 sind jeweils in der Form eines Fingerhuts ausgebildet und vorzugsweise etwa lotrecht zur Längsrichtung der Stangen 26, 27 ausgerichtet. Die etwa halbkugelförmig ausgebildeten Kuppen 30, 31 der Abbrandkontakte 28, 29 stehen über die Stangen 26, 27 über und weisen etwa in Richtung zu dem Abbrandkontakt 21 des Festkontakts 11.At the free ends of the two rods 26, 27 each have a Abbrandkontakt 28, 29 is attached, which consist of an electrically conductive material with the highest possible melting point. The Abbrandkontakte 28, 29 are each formed in the shape of a thimble and preferably approximately perpendicular to the longitudinal direction of the rods 26, 27 aligned. The approximately hemispherical formed peaks 30, 31 of the Abbrandkontakte 28, 29 are about the rods 26, 27 and have approximately in the direction of the Abbrandkontakt 21 of the fixed contact eleventh

Der Abstand der beiden Stangen 26, 27 des beweglichen Kontakts 12 in Richtung der Achse 24 entspricht der Breite des zweiten Schenkels 19 des Festkontakts 11 in derselben Richtung. Dies ergibt sich insbesondere aus den Draufsichten der Figuren 2b, 3b. In der geschlossenen Stellung des Erdungsschalters 10 gemäß den Figuren 3a, 3b befindet sich somit der zweite Schenkel 19 des Festkontakts 11 zwischen den beiden Stangen 26, 27 des beweglichen Kontakts 12. Der zweite Schenkel 19 liegt dabei derart an den beiden Stangen 26, 27 an, dass ein elektrischer Kontakt vorhanden ist.The distance between the two rods 26, 27 of the movable contact 12 in the direction of the axis 24 corresponds to the width of the second leg 19 of the fixed contact 11 in the same direction. This is evident in particular from the plan views of FIGS. 2b . 3b , In the closed position of the earthing switch 10 according to the FIGS. 3a, 3b is thus the second leg 19 of the fixed contact 11 between the two rods 26, 27 of the movable contact 12. The second leg 19 is in such a way on the two rods 26, 27 that an electrical contact is present.

Wie bereits erwähnt wurde, zeigt die Figur 1 die geöffnete Stellung des Erdungsschalters 10. Aufgrund des Abstands des beweglichen Kontakts 12 von dem Festkontakt 11 besteht keine elektrische Verbindung zwischen den Kontakten 11, 12 und es kann auch kein Lichtbogen insbesondere zwischen den Abbrandkontakten 21, 28, 29 entstehen.As already mentioned, the shows FIG. 1 Due to the distance of the movable contact 12 of the fixed contact 11 is no electrical connection between the contacts 11, 12 and there is no arc, in particular between the Abbrandkontakten 21, 28, 29 arise.

Es wird nunmehr davon ausgegangen, dass der bewegliche Kontakt 12 durch eine wie auch immer mittels eines Antriebs hervorgerufene mechanische Betätigung um die Achse 24 in Richtung zu dem Festkontakt 11 geschwenkt wird. Irgendwann erreicht der bewegliche Kontakt 12 dann die in den Figuren 2a, 2b gezeigte Zwischenstellung. In dieser Zwischenstellung zwischen der geöffneten Stellung der Figur 1 und der geschlossenen Stellung der Figuren 3a, 3b ist der Abstand des beweglichen Kontakts 12 von dem Festkontakt 11 so gering geworden, dass ein stromführender Lichtbogen entsteht.It will now be assumed that the movable contact 12 is pivoted about the axis 24 in the direction of the fixed contact 11 by a mechanical actuation, which may be caused by a drive. At some point, the movable contact 12 then reaches the in the FIGS. 2a, 2 B shown intermediate position. In this intermediate position between the open position of the FIG. 1 and the closed position of FIGS. 3a, 3b the distance between the movable contact 12 of the fixed contact 11 has become so low that a current-carrying arc is formed.

In der Figur 2b sind zwei Lichtbögen 33, 34 dargestellt, von denen sich der erste Lichtbogen 33 von dem Abbrandkontakt 28 der ersten Stange 26 zu dem Abbrandkontakt 22 des Festkontakts 11 und der zweite Lichtbogen 34 von dem Abbrandkontakt 29 der zweiten Stange 27 zu dem Abbrandkontakt 22 des Festkontakts 11 erstreckt. Der vorstehend genannte stromführende Lichtbogen wird zumindest von einem dieser beiden Lichtbögen 33 , 34 gebildet. Nachfolgend wird davon ausgegangen, dass nur der Lichtbogen 33 vorhanden ist. Es versteht sich, dass die nachfolgenden Erläuterungen in entsprechender Weise auch für den Lichtbogen 34 gelten, sofern er vorhanden ist.In the FIG. 2b two arcs 33, 34 are shown, of which the first arc 33 from the Abbrandkontakt 28 of the first rod 26 to the Abbrandkontakt 22 of the fixed contact 11 and the second arc 34 from the Abbrandkontakt 29 of the second rod 27 to the Abbrandkontakt 22 of the fixed contact 11th extends. The above-mentioned current-carrying arc is formed by at least one of these two arcs 33, 34. Subsequently, it is assumed that only the arc 33 is present. It is understood that the following explanations apply in a corresponding manner for the arc 34, if it is present.

Wenn sich ein Lichtbogen zwischen zwei Abbrandkontakten erstreckt, so hängt die Lage der Fußpunkte dieses Lichtbogens ganz allgemein von der Ausbildung der Abbrandkontakte sowie von deren Anordnung zueinander ab. Die Bereiche, in denen sich die Fußpunkte bewegen, können insbesondere aus dem elektrodynamischen Verhalten des Lichtbogens abgeleitet und/oder durch Versuche ermittelt werden.If an arc extends between two Abbrandkontakten so the location of the bases of this arc depends quite generally on the formation of the Abbrandkontakte and their arrangement from each other. The areas in which the foot points move can be derived in particular from the electrodynamic behavior of the arc and / or can be determined by experiments.

Bei dem vorliegenden Ausführungsbeispiel befindet sich der Fußpunkt des Lichtbogens 33 aufgrund der Ausgestaltung der Abbrandkontakte 21, 28 auf der Kuppe 30 des Abbrandkontakts 28 des beweglichen Kontakts 12 sowie auf der Kuppe 22 des Abbrandkontakts 21 des Festkontakts 11. Dies ergibt sich insbesondere aus der Figur 2a. Die erläuterten Bereiche der Abbrandkontakte 21, 28 befinden sich also vorliegend auf den Kuppen 22, 30 der Abbrandkontakte 21, 28.In the present embodiment, the base of the arc 33 is due to the configuration of Abbrandkontakte 21, 28 on the top 30 of Abbrandkontakts 28 of the movable contact 12 and on the top 22 of the Abbrandkontakts 21 of the fixed contact 11. This results in particular from the FIG. 2a , The explained areas of the Abbrandkontakte 21, 28 are thus present on the knobs 22, 30 of the Abbrandkontakte 21, 28th

In der Zwischenstellung der Figuren 2a, 2b ist es aufgrund der hohen Temperaturen des Lichtbogens 33 möglich, dass es in den Bereichen der Kuppen 22, 30 der Abbrandkontakte 21, 28 gegebenenfalls zu sogenannten Aufschmelzungen kommt. Dies bedeutet, dass das dort vorhandene Material der Abbrandkontakte 21, 28 in einem gewissen Umfang schmilzt und dadurch in einen weichen oder nahezu flüssigen Zustand übergeht.In the intermediate position of FIGS. 2a, 2b It is possible due to the high temperatures of the arc 33, that it in the Regions of the crests 22, 30 of the Abbrandkontakte 21, 28 optionally to so-called melting occurs. This means that the existing there material of the Abbrandkontakte 21, 28 melts to a certain extent and thereby passes into a soft or nearly liquid state.

Es wird nunmehr davon ausgegangen, dass der bewegliche Kontakt 12 durch die erwähnte mechanische Betätigung weiter um die Achse 24 in Richtung zu dem Festkontakt 11 geschwenkt wird. Irgendwann erreicht der bewegliche Kontakt 12 dann die in den Figuren 3a, 3b gezeigte geschlossene Stellung des Erdungsschalters 10.It is now assumed that the movable contact 12 is further pivoted by the aforementioned mechanical actuation about the axis 24 in the direction of the fixed contact 11. At some point, the movable contact 12 then reaches the in the FIGS. 3a, 3b shown closed position of the earthing switch 10th

Wie bereits erwähnt wurde, befindet sich nunmehr der zweite Schenkel 19 des Festkontakts 11 zwischen den beiden Stangen 26, 27 des beweglichen Kontakts 12, so dass eine elektrische Verbindung vorhanden ist. Diese elektrische Verbindung ist dabei nicht über die erläuterten Bereiche der Abbrandkontakte 28, 29, 21 der beweglichen und des Festkontakts 12, 11 geführt, sondern unabhängig von diesen Bereichen. So führt die elektrische Verbindung zwischen dem Festkontakt 11 und dem beweglichen Kontakt 12 von dem zweiten Schenkel 19 des Festkontakts 11 zu den beiden Stangen 26, 27 des beweglichen Kontakts 12. Wie sich insbesondere aus der Figur 3b ergibt, liegen diejenigen Flächen 36 des zweiten Schenkels 19, die in derselben Ebene liegen wie die U-Form des Festkontakts 11, an den einander zugewandten Flächen 37 der beiden Stangen 26, 27 an. Diese Flächen 36, 37 befinden sich somit in der geschlossenen Stellung des Erdungsschalters 10 der Figuren 3a, 3b örtlich in einem völlig anderen Bereich des Erdungsschalters 10 als die Kuppen 22, 30, 31 der Abbrandkontakte 21, 28, 29.As already mentioned, now is the second leg 19 of the fixed contact 11 between the two rods 26, 27 of the movable contact 12, so that an electrical connection is present. This electrical connection is not performed over the described areas of the Abbrandkontakte 28, 29, 21 of the movable and the fixed contact 12, 11, but independent of these areas. Thus, the electrical connection between the fixed contact 11 and the movable contact 12 leads from the second leg 19 of the fixed contact 11 to the two rods 26, 27 of the movable contact 12. As can be seen in particular from FIG. 3b results, are those surfaces 36 of the second leg 19, which lie in the same plane as the U-shape of the fixed contact 11, on the mutually facing surfaces 37 of the two rods 26, 27 at. These surfaces 36, 37 are thus in the closed position of the earthing switch 10 of FIGS. 3a, 3b locally in a completely different area of the earthing switch 10 than the studs 22, 30, 31 of the consumable contacts 21, 28, 29.

Weiterhin kann den Figuren 3a, 3b entnommen werden, dass sich auch die Kuppen 30, 31 der Abbrandkontakte 28, 29 des beweglichen Kontakts 12 örtlich in einem völlig anderen Bereich des Erdungsschalters 10 befinden als die Kuppe 22 des Abbrandkontakts 21 des Festkontakts 11. Insbesondere geht aus den Figuren 3a, 3b hervor, dass sich die die Kuppen 30, 31 der Abbrandkontakte 28, 29 des beweglichen Kontakts 12 und die Kuppe 22 des Abbrandkontakts 21 des Festkontakts 11 in der geschlossenen Stellung des Erdungsschalters 10 nicht berühren können.Furthermore, the FIGS. 3a, 3b can be taken that also the crests 30, 31 of the Abbrandkontakte 28, 29 of the movable contact 12 locally in a completely different Area of the earthing switch 10 are located as the top 22 of the Abbrandkontakts 21 of the fixed contact 11. In particular, goes from the FIGS. 3a, 3b that the tips 30, 31 of the Abbrandkontakte 28, 29 of the movable contact 12 and the top 22 of the Abbrandkontakts 21 of the fixed contact 11 in the closed position of the earthing switch 10 can not touch.

Beim Übergang in die in den Figuren 3a, 3b gezeigte geschlossene Stellung des Erdungsschalters 10 kommutiert der Strom von dem Lichtbogen 33 auf die vorstehend erläuterte elektrische Verbindung. Der Lichtbogen 33 erlöscht damit. Aufgrund der galvanischen Verbindung über die einander berührenden Flächen 36, 37 entsteht dort kein Lichtbogen.At the transition to the in the FIGS. 3a, 3b shown closed position of the earthing switch 10, the current commutes from the arc 33 to the above-described electrical connection. The arc 33 goes out with it. Due to the galvanic connection via the contacting surfaces 36, 37 there is no arc.

Wie erläutert wurde, kann es beim Übergang in die geschlossene Stellung des Erdungsschalters 10 im Bereich der Kuppen 22, 30, 31 der Abbrandkontakte 21, 28, 29 gegebenenfalls zu sogenannten Aufschmelzungen kommen. Wie ebenfalls erläutert wurde, können sich die Kuppen 30, 31 der Abbrandkontakte 28, 29 des beweglichen Kontakts 12 und die Kuppe 22 des Abbrandkontakts 21 des Festkontakts 11 in der geschlossenen Stellung des Erdungsschalters 10 jedoch nicht berühren. Dies bedeutet mit anderen Worten, dass diejenigen Bereiche, in denen sich die erläuterten Fußpunkte des Lichtbogens 33 befinden, in der geschlossenen Stellung des Erdungsschalters 10 nicht in Kontakt miteinander kommen können und sich damit nicht berühren. Damit ist es nicht möglich, dass sich die Abbrandkontakte 28, 29 des beweglichen Kontakts 12 und der Abbrandkontakt 21 des Festkontakts 11 aufgrund der durch den Lichtbogen 33 entstehenden Aufschmelzungen in der geschlossenen Stellung des Erdungsschalters 10 miteinander verschweißen.As has been explained, in the transition to the closed position of the earthing switch 10 in the region of the studs 22, 30, 31 of the burned-on contacts 21, 28, 29, so-called melting-up may possibly occur. As has also been explained, the tips 30, 31 of the Abbrandkontakte 28, 29 of the movable contact 12 and the tip 22 of the Abbrandkontakts 21 of the fixed contact 11 in the closed position of the earthing switch 10 can not touch. This means in other words that those areas in which the explained bases of the arc 33 are located can not come into contact with each other in the closed position of the earthing switch 10 and thus do not touch each other. Thus, it is not possible that the Abbrandkontakte 28, 29 of the movable contact 12 and the Abbrandkontakt 21 of the fixed contact 11 due to the arcs 33 resulting melting in the closed position of the earthing switch 10 welded together.

Weiterhin wurde erläutert, dass die elektrische Verbindung im geschlossenen Zustand des Erdungsschalters 10 über die Flächen 36, 37 führt, also über einen völlig anderen Bereich des Erdungsschalters 10 als die Kuppen 22, 30, 31 der Abbrandkontakte 21, 28, 29. Auch insoweit kann somit keine Verschweißung der Abbrandkontakte 28, 29 des beweglichen Kontakts 12 und des Abbrandkontakts 21 des Festkontakts 11 entstehen.Furthermore, it was explained that the electrical connection in the closed state of the earthing switch 10 over the surfaces 36, 37 leads, so over a completely different area of Earthing switch 10 as the studs 22, 30, 31 of the Abbrandkontakte 21, 28, 29. Also in this respect can thus no welding of the Abbrandkontakte 28, 29 of the movable contact 12 and the Abbrandkontakts 21 of the fixed contact 11 arise.

Es versteht sich, dass der Festkontakt 11 und der bewegliche Kontakt 12 auch andersartig ausgebildet sein können. Insbesondere versteht es sich, dass der bewegliche Kontakt 12 auch mittels einer andersartigen Bewegung, beispielsweise mittels einer linearen Bewegung, von einer geöffneten Stellung in eine geschlossene Stellung des Erdungsschalters 10 übergehen kann.It is understood that the fixed contact 11 and the movable contact 12 may be formed differently. In particular, it will be understood that the movable contact 12 may also transition from an open position to a closed position of the earthing switch 10 by means of a different movement, for example by means of a linear movement.

Claims (7)

  1. Earthing switch (10), in particular for a medium voltage switching assembly, having a fixed contact (11) and a moveable contact (12), wherein the moveable contact (12) can be moved from an opened position into a closed position and vice versa, and wherein the fixed contact (11) and the moveable contact (12) possess arcing contacts (21, 28, 29) made of an electrically conductive material with a high melting point, characterised in that in the closed position of the earthing switch (10) an electrical connection runs via surfaces (36, 37) which differ in position from the regions of the arcing contacts (21, 28, 29) in which the base points of an electric arc (33, 34) are located, and that on transition into the closed position a current commutates from the electric arc to the electrical connection.
  2. Earthing switch (10) according to claim 1, wherein the arcing contacts (21, 28, 29) are designed and/or arranged such that the base points of an electric arc (33, 34) which may be formed on a movement of the moveable contact (12) are located in definable regions of the arcing contacts (21, 28, 29), and wherein those regions of the arcing contacts (21, 28, 29) in which the base points of the electric arc (33, 34) are located do not make contact in the closed position of the earthing switch (10).
  3. Earthing switch (10) according to claim 2, wherein that region of the arcing contact (21) of the fixed contact (11) and that region of the arcing contact (28, 29) of the moveable contact (12) in which the base points of the electric arc (33, 34) are located are, in the closed position, located in different regions of the earthing switch (10).
  4. Earthing switch (10) according to one of the preceding claims, wherein the regions of the arcing contacts (21, 28, 29) in which the base points of the electric arc (33, 34) are located are substantially formed as tips (22, 30, 31) of the arcing contacts (21, 28, 29).
  5. Earthing switch (10) according to one of the preceding claims, wherein the fixed contact (11) has a first leg (17) which is assigned to the arcing contact (21), wherein the moveable contact (12) has two bars (26, 27), each of which is provided with an arcing contact (28, 29), and wherein the arcing contact (21) assigned to the first leg (17) and the arcing contacts (28, 29) belonging to the bars (26, 27) are, in the closed position of the earthing switch (10), located in different regions of the earthing switch (10).
  6. Earthing switch (10) according to claim 5, wherein the fixed contact (11) has a second leg (19), and wherein in the closed position of the earthing switch (10) an electrical connection exists between the second leg (19) of the fixed contact (11) and the bars (26, 27) of the moveable contact (12).
  7. Earthing switch (10) according to one of the preceding claims, wherein the moveable contact (12) can be moved from the opened position into the closed position by means of a swivelling movement.
EP10161962.5A 2009-07-10 2010-05-05 Earthing switch, in particular for a medium voltage switching assembly Revoked EP2273524B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910032540 DE102009032540A1 (en) 2009-07-10 2009-07-10 Earthing switch, in particular for a medium-voltage switchgear

Publications (3)

Publication Number Publication Date
EP2273524A2 EP2273524A2 (en) 2011-01-12
EP2273524A3 EP2273524A3 (en) 2012-02-29
EP2273524B1 true EP2273524B1 (en) 2016-03-02

Family

ID=42937738

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Application Number Title Priority Date Filing Date
EP10161962.5A Revoked EP2273524B1 (en) 2009-07-10 2010-05-05 Earthing switch, in particular for a medium voltage switching assembly

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EP (1) EP2273524B1 (en)
DE (1) DE102009032540A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI11882U1 (en) 2017-09-15 2017-12-05 Abb Oy Switches
CN112820562A (en) * 2020-11-16 2021-05-18 平高集团有限公司 Earthing switch device and switch cabinet

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8907091U1 (en) 1989-06-07 1989-09-14 Siemens AG, 1000 Berlin und 8000 München Contact device for lever disconnector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3235380A1 (en) * 1982-09-24 1984-03-29 Ruhrtal Elektrizitätsgesellschaft Hartig GmbH & Co, 4300 Essen Mating contact for isolating switches
DE3436173A1 (en) * 1984-08-22 1986-03-06 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Switching installation
DE59900721D1 (en) * 1998-04-03 2002-02-28 Siemens Ag ENCLOSURE MODULE WITH A THREE-POSITION SWITCH INTEGRATED INTO A CABINET FOR A GAS-INSULATED SWITCHGEAR

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8907091U1 (en) 1989-06-07 1989-09-14 Siemens AG, 1000 Berlin und 8000 München Contact device for lever disconnector

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EP2273524A3 (en) 2012-02-29
DE102009032540A1 (en) 2011-01-13
EP2273524A2 (en) 2011-01-12

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