EP2238658A1 - Electric protective component with a short-circuit device - Google Patents

Electric protective component with a short-circuit device

Info

Publication number
EP2238658A1
EP2238658A1 EP09706372A EP09706372A EP2238658A1 EP 2238658 A1 EP2238658 A1 EP 2238658A1 EP 09706372 A EP09706372 A EP 09706372A EP 09706372 A EP09706372 A EP 09706372A EP 2238658 A1 EP2238658 A1 EP 2238658A1
Authority
EP
European Patent Office
Prior art keywords
fusible element
electrical protection
protection component
component according
shorting bar
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.)
Granted
Application number
EP09706372A
Other languages
German (de)
French (fr)
Other versions
EP2238658B1 (en
Inventor
Peter Bobert
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.)
TDK Electronics AG
Original Assignee
Epcos 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 Epcos AG filed Critical Epcos AG
Publication of EP2238658A1 publication Critical patent/EP2238658A1/en
Application granted granted Critical
Publication of EP2238658B1 publication Critical patent/EP2238658B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure

Definitions

  • the surge arrester has a hollow body on which at least two electrodes are arranged.
  • a 2-electrode arrester has a one-piece ceramic hollow body.
  • the ceramic hollow body is divided by means of a central electrode into two separate parts. The two parts are arranged with a first side on a central electrode. On a second side of the two parts, an end electrode is arranged in each case.
  • the electrical protection component has at least one melting element.
  • the electrical protection component has a short-circuiting device, which on the Surge Arrester is arranged.
  • the short-circuit device is used, in excessively high heating of the arrester, to short-circuit the electrodes of the arrester, so that the current no longer flows through the arrester, but via the short-circuit device.
  • the short-circuiting device comprises a shorting bar which is pretensioned and presses on the fusible element by its spring force. By the fusible element of the shorting bar is spaced from the electrodes of the surge arrester.
  • the fusible element has a geometric shape, wherein the geometric shape comprises at least one cavity.
  • the cavity is a space to understand, which is formed by parts or portions of the fusible element. It may be both a closed space, as well as a space having an opening at least one side. The space is bounded at least by two faces or portions of the fusible element.
  • the melting element is tubular.
  • the melting element has the shape of a slotted tube.
  • the slot may extend partially or entirely longitudinally through the lateral surface of the tubular fusible element.
  • the melting element has the shape of a hollow cuboid.
  • the hollow cuboid may have an opening on at least one side.
  • the melting element may consist of a sheet material which has kinks or folded. It is also possible that the fusible element comprises a folded foil which is folded or formed into a polygonal body.
  • the melting element is at least one
  • the fusible element is arranged at other locations of the surge arrester, it being ensured that the shorting bar is normally spaced apart from the electrodes of the surge arrester by the fusible element.
  • the melting element melts.
  • the short-circuiting bar presses against the at least two electrodes of the surge arrester and electrically connects them to one another via the short-circuiting bar.
  • Surge arrester has a center electrode.
  • the shorting bar in such a variant has a connection to the center electrode. If the surge arrester is excessively heated, the shorting bar connects the two electrodes to the center electrode via the shorting bar.
  • the melting element consists of an insulating plastic.
  • an insulating plastic for this purpose, for example polypropylene or other plastics are suitable which have electrically insulating properties.
  • the melting element has the shape of an injection molded part. By means of an injection molding process can be produced any geometric shapes.
  • the fusible element is arranged such that the greatest rigidity of the fusible element is directed in the direction of the pressure force exerted by the shorting bar.
  • the fuser has little material, the
  • Melting element however, has a high static strength with respect to the small amount of material. By using the least possible material to be melted, a fast switching operation of the short-circuiting device can be achieved.
  • FIG. 1a shows an electrical protection component in a side view with tubular fusible elements on the end faces
  • FIG. 1b shows the electrical protection component according to FIG. 1b
  • FIG. 2a shows an electrical protection component in one
  • FIG. 2b shows the electrical protection component according to FIG.
  • Protective device shown comprising a surge arrester 1 with two hollow bodies 9 and three electrodes 2, 6.
  • the surge arrester 1 has at the end faces in each case an electrode 2.
  • the surge arrester 1 in the illustrated embodiment has a central electrode 6.
  • the electrodes 2 and the middle electrode 6 are provided with connecting wires 7.
  • a shorting bar 5 is arranged, which has an electrical contact to the central electrode 6.
  • a fusible element 3 is arranged in each case.
  • the melting element 3 has a cavity 4.
  • Melting element 3 is preferably arranged between the electrode 2 and the shorting bar 5, so that the greatest rigidity of the melting element 3 is directed in the direction of the pressing force of the shorting bar 5 directed towards the melting element 3.
  • the fusible element 3 has a tubular shape, wherein the fusible element 3 is aligned with the openings of the tube in the direction of electrode 2 and in the direction of shorting bar 5.
  • a tubular body in such an arrangement has its greatest rigidity with respect to a force acting perpendicularly on the tube in the direction of the longitudinal axis.
  • Such an arrangement makes it possible to use a fusible element 3 which has only a small amount of material compared to its dimensions.
  • the tubular body of the fusible element 3 has a slot 8, through which the connecting wire 7 of the electrode 2 is guided.
  • the slot 8 is shown in FIG. In a further embodiment, it may also be a 2-electrode arrester, wherein the short-circuit bar is mechanically connected in this case, for example by means of a ring or a clamp in the region of the hollow body with the surge arrester.
  • FIG. 1 b shows a view of the electrical protection component from FIG. 1 a, with a view of the end face of the surge arrester 1.
  • the tubular fusible element 3 has a slot 8, through which the connection wire 7 of the electrode 2 is guided.
  • the illustrated electrical protection device is a 3-electrode arrester.
  • a third, middle electrode 6 has an electrical contact to the shorting bar 5. In case of excessive heating of the
  • Surge arrester 1 connects the shorting bar 5, the electrodes 2 of the surge arrester 1 with the central electrode 6.
  • the central electrode 6 has a larger diameter than the body of the surge arrester 1.
  • FIGS. 2 a and 2 b show a further exemplary embodiment of an electrical protection component.
  • the surge arrester 1 of the electrical protection component has two hollow bodies 9 and at least two electrodes 2. In the illustrated embodiment, it is a 3-electrode arrester having a third, central electrode 6. The electrodes 2 and the middle electrode 6 are provided with lead wires 7 for mounting purposes.
  • the surge arrester 1 is provided with a
  • Short-circuit device provided which includes a shorting bar 5.
  • the shorting bar 5 is by means of fusible elements 3 of the electrodes 2 of the surge arrester. 1 spaced.
  • the shorting bar 5 is biased and presses on the fusible elements 3. In the case of excessive heating of the Studentsnapssabieiters 1 melt the fusible elements 3, whereby the shorting bar 5 generates an electrical contact between the electrodes 2.
  • the fusible element 3 preferably has a cavity 4.
  • the melting element 3 has a small quantity of material compared to the volume of the melting element 3. Due to the reduced amount of material of the fusible element 3, the fusible element 3 melts faster than a solid fusible element 3 if the surge arrester 1 is excessively heated.
  • the cavity 4 of the fusible element 3 is preferably arranged such that the fusible element 3 acts in the direction of the compressive force acting on the fusible element 3 has its greatest rigidity by the shorting bar 5.
  • FIG. 2b shows a view of the electrical protection component from FIG. 2a from its front side.
  • the short-circuiting device comprises a shorting bar 5, which is spaced apart from the electrodes 2 of the surge arrester 1 by means of two fusible elements 3.
  • the shorting bar 5 has an electrical contact with a - S -
  • fusible element wherein geometric shapes, which have one or more cavities and thereby have a compared to a solid fusible element, a smaller amount of material, are particularly suitable.
  • the invention is not limited to the number of elements shown.

Landscapes

  • Fuses (AREA)

Abstract

The invention relates to an electric protective component with a short-circuit device, comprising an overvoltage arrester (1) with at least two electrodes (2). Said electric protective component comprises at least one fusible element (3) that has a geometric form and that has at least one cavity (4). A short-circuit bar (5) is arranged on the overvoltage arrester (1), presses against the fusible element (3) and is arranged at a distance from the electrodes (2) by means of the fusible element (3).

Description

Beschreibungdescription
Elektrisches Schutzbauelement mit KurzschlusseinrichtungElectrical protection component with short-circuit device
Aus der Druckschrift EP 0962037 Bl ist ein gasgefüllter Überspannungsableiter mit äußerer Kurzschlusseinrichtung bekannt .From the publication EP 0962037 Bl a gas-filled surge arrester with external short-circuiting device is known.
Es ist Aufgabe der vorliegenden Erfindung ein elektrisches Schutzbauelement anzugeben das eine Kurzschlusseinrichtung aufweist, die schnell anspricht.It is an object of the present invention to provide an electrical protection device having a short-circuit device that responds quickly.
Die Aufgabe wird durch ein elektrisches Schutzbauelement nach Patentanspruch 1 gelöst. Vorteilhafte Ausgestaltungen des elektrischen Schutzbauelements sind Gegenstand von Unteransprüchen.The object is achieved by an electrical protection device according to claim 1. Advantageous embodiments of the electrical protection component are the subject of dependent claims.
Es wird ein elektrisches Schutzbauelement mit Kurzschlusseinrichtung angegeben das einen Überspannungsableiter mit wenigstens zwei Elektroden aufweist. Der Überspannungsableiter weist einen Hohlkörper auf, an dem wenigstens zwei Elektroden angeordnet sind. Ein 2 -Elektroden-Ableiter weist einen einstückigen keramischen Hohlkörper auf. Bei einem 3 -Elektroden-Ableiter ist der keramische Hohlkörper mittels einer mittleren Elektrode in zwei separate Teile unterteilt. Die beiden Teile sind mit einer ersten Seite an einer mittleren Elektrode angeordnet. An einer zweiten Seite der beiden Teile ist jeweils eine Endelektrode angeordnet.It is an electrical protection device with short-circuiting indicated that has a surge arrester with at least two electrodes. The surge arrester has a hollow body on which at least two electrodes are arranged. A 2-electrode arrester has a one-piece ceramic hollow body. In a 3-electrode arrester, the ceramic hollow body is divided by means of a central electrode into two separate parts. The two parts are arranged with a first side on a central electrode. On a second side of the two parts, an end electrode is arranged in each case.
Das elektrische Schutzbauelement weist wenigstens ein Schmelzelement auf. Das elektrische Schutzbauelement weist eine Kurzschlusseinrichtung auf, die an dem Überspannungsabieiter angeordnet ist. Die Kurzschlusseinrichtung dient dazu, bei übermäßig starker Erwärmung des Ableiters, die Elektroden des Ableiters kurz zu schließen, so dass der Strom nicht mehr durch den Ableiter hindurch, sondern über die Kurzschlusseinrichtung fließt. Die Kurzschlusseinrichtung umfasst in einer bevorzugten Ausführungsform einen Kurzschlussbügel, der vorgespannt ist und durch seine Federkraft auf das Schmelzelement drückt. Durch das Schmelzelement ist der Kurzschlussbügel von den Elektroden des Überspannungsabieiters beabstandet .The electrical protection component has at least one melting element. The electrical protection component has a short-circuiting device, which on the Surge Arrester is arranged. The short-circuit device is used, in excessively high heating of the arrester, to short-circuit the electrodes of the arrester, so that the current no longer flows through the arrester, but via the short-circuit device. In a preferred embodiment, the short-circuiting device comprises a shorting bar which is pretensioned and presses on the fusible element by its spring force. By the fusible element of the shorting bar is spaced from the electrodes of the surge arrester.
Das Schmelzelement weist eine geometrische Form auf, wobei die geometrische Form wenigstens einen Hohlraum umfasst. Unter dem Hohlraum ist ein Raum zu verstehen, der durch Teile beziehungsweise Abschnitte des Schmelzelements gebildet wird. Dabei kann es sich sowohl um einen geschlossenen Raum handeln, als auch um einen Raum der nach wenigstens einer Seite hin eine Öffnung aufweist. Der Raum wird wenigstens durch zwei Flächen oder Abschnitte des Schmelzelements begrenzt.The fusible element has a geometric shape, wherein the geometric shape comprises at least one cavity. Under the cavity is a space to understand, which is formed by parts or portions of the fusible element. It may be both a closed space, as well as a space having an opening at least one side. The space is bounded at least by two faces or portions of the fusible element.
In einer bevorzugten Ausführungsform ist das Schmelzelement rohrförmig ausgebildet. Es ist jedoch auch möglich, dass das Schmelzelement die Form eines geschlitzten Rohrs aufweist. Der Schlitz kann teilweise oder ganz in Längsrichtung durch die Mantelfläche des rohrförmigen Schmelzelements reichen.In a preferred embodiment, the melting element is tubular. However, it is also possible that the melting element has the shape of a slotted tube. The slot may extend partially or entirely longitudinally through the lateral surface of the tubular fusible element.
In einer weiteren Ausführungsform weist das Schmelzelement die Form eines Hohlquaders auf . Der Hohlquader kann zu wenigstens einer Seite eine Öffnung aufweisen.In a further embodiment, the melting element has the shape of a hollow cuboid. The hollow cuboid may have an opening on at least one side.
Das Schmelzelement kann in einer weiteren Ausführungsform aus einem flächigen Material bestehen, das Knicke aufweist beziehungsweise gefaltet ist. Es ist auch möglich, dass das Schmelzelement eine gefaltete Folie umfasst, die zu einem mehreckigen Körper gefaltet beziehungsweise geformt ist.In a further embodiment, the melting element may consist of a sheet material which has kinks or folded. It is also possible that the fusible element comprises a folded foil which is folded or formed into a polygonal body.
Vorzugsweise ist das Schmelzelement an wenigstens einerPreferably, the melting element is at least one
Stirnseite des elektrischen Schutzbauelements angeordnet. Es ist jedoch auch möglich, dass das Schmelzelement an weiteren Stellen des Überspannungsabieiters angeordnet ist, wobei gewährleistet ist, dass der Kurzschlussbügel im Normalfall durch das Schmelzelement von den Elektroden des Überspannungsabieiters beabstandet Ist.Front side of the electrical protection component arranged. However, it is also possible that the fusible element is arranged at other locations of the surge arrester, it being ensured that the shorting bar is normally spaced apart from the electrodes of the surge arrester by the fusible element.
Bei unzulässig starker Erwärmung des Überspannungsabieiters schmilzt das Schmelzelement. Beim Schmelzen des Schmelzelements drückt der Kurzschlussbügel auf die wenigstens zwei Elektroden des Überspannungsabieiters und verbindet diese über den Kurzschlussbügel elektrisch miteinander.If the surge arrester heats up excessively, the melting element melts. When the melting element melts, the short-circuiting bar presses against the at least two electrodes of the surge arrester and electrically connects them to one another via the short-circuiting bar.
In einer weiteren Ausführungsform weist derIn a further embodiment, the
Überspannungsabieiter eine Mittelelektrode auf . Der Kurzschlussbügel weist in einer derartigen Variante eine Verbindung zu der Mittelelektrode auf . Bei unzulässig starker Erwärmung des Überspannungsabieiters wird durch den Kurzschlussbügel eine Verbindung der beiden Elektroden zur Mittelelektrode über den Kurzschlussbügel hergestellt.Surge arrester has a center electrode. The shorting bar in such a variant has a connection to the center electrode. If the surge arrester is excessively heated, the shorting bar connects the two electrodes to the center electrode via the shorting bar.
Vorzugsweise besteht das Schmelzelement aus einem isolierenden Kunststoff . Hierzu eignen sich beispielsweise Polypropylen oder andere Kunststoffe die elektrisch isolierende Eigenschaften aufweisen. In einer bevorzugten Ausführungsform weist das Schmelzelement die Form eines Spritzgussformteils auf. Mittels eines Spritzgussverfahrens lassen sich beliebige geometrische Formen herstellen.Preferably, the melting element consists of an insulating plastic. For this purpose, for example polypropylene or other plastics are suitable which have electrically insulating properties. In a preferred embodiment, the melting element has the shape of an injection molded part. By means of an injection molding process can be produced any geometric shapes.
Bevorzugt ist das Schmelzelement derart angeordnet, dass die größte Steifigkeit des Schmelzelements in Richtung der vom Kurzschlussbügel ausgeübten Druckkraft gerichtet ist.Preferably, the fusible element is arranged such that the greatest rigidity of the fusible element is directed in the direction of the pressure force exerted by the shorting bar.
Das Schmelzelement weist wenig Material auf, wobei dasThe fuser has little material, the
Schmelzelement in Bezug auf die geringe Materialmenge jedoch eine hohe statische Festigkeit aufweist. Durch den Einsatz von möglichst wenig zu schmelzendem Material lässt sich ein schneller Schaltvorgang der Kurzschlussvorrichtung erreichen.Melting element, however, has a high static strength with respect to the small amount of material. By using the least possible material to be melted, a fast switching operation of the short-circuiting device can be achieved.
Im Vergleich zu einem elektrischen Schutzbauelement, bei dem eine Folie als isolierendes Element zwischen Kurzschlussbügel und Elektroden des Überspannungsabieiters verwendet wird, kann bei einem elektrischen Schutzbauelement mit wie oben beschriebenem Schmelzelement ein größerer Abstand zwischen Kurzschlussbügel und Elektroden erzeugt werden. Dadurch verringert sich die Gefahr eines Funkenüberschlags, auch wenn sich das Schmelzelement nicht unmittelbar zwischen der Kontaktfläche des Kurzschlussbügels und dem Überspannungsableiter befindet.In comparison with an electrical protection component in which a film is used as an insulating element between the shorting bar and electrodes of the surge arrester, a greater distance between shorting bar and electrodes can be produced in an electrical protection component with the above-described fuse element. This reduces the risk of sparkover, even if the fuse is not directly between the contact surface of the shorting bar and the surge arrester.
Im Fall, dass die Elektroden des Überspannungsabieiters mittels des Kurzschlussbügels kurz geschlossen sind, beziehungsweise bei unzulässig starker Erwärmung des Überspannungsabieiters befindet sich vorzugsweise möglichst kein Kunststoffmaterial des Schmelzelements mehr zwischen den Kontaktflächen des Kurzschlussbügels und der Elektroden, so _ _In the event that the electrodes of the surge arrester are short-circuited by means of the short-circuiting bar, or if the surge arrester is heated excessively, preferably no plastic material of the melting element is located between the contact surfaces of the shorting bar and the electrodes _ _
dass ein sicherer elektrischer Kontakt zwischen dem Kurzschlussbügel und den Elektroden gewährleistet ist.that a secure electrical contact between the shorting bar and the electrodes is ensured.
Durch die Wahl entsprechender Kunststoffe und Geometrien lässt sich somit ein entsprechend großer Temperaturbereich abdecken, wodurch auch das Ansprechverhalten der Kurzschlusseinrichtung beeinflusst werden kann.By choosing appropriate plastics and geometries can thus cover a correspondingly large temperature range, whereby the response of the short-circuiting device can be influenced.
Die oben beschriebenen Gegenstände werden anhand der folgenden Figuren und Ausführungsbeispiele näher erläutert.The objects described above will be explained in more detail with reference to the following figures and embodiments.
Die nachfolgend beschriebenen Zeichnungen sind nicht als maßstabsgetreu aufzufassen. Vielmehr können zur besseren Darstellung einzelne Dimensionen vergrößert, verkleinert oder auch verzerrt dargestellt sein. Elemente die einander gleichen oder die die gleiche Funktion übernehmen sind mit den gleichen Bezugszeichen bezeichnet.The drawings described below are not to be considered as true to scale. Rather, for better representation, individual dimensions can be enlarged, reduced or distorted. Elements which are identical or which assume the same function are designated by the same reference numerals.
Figur Ia zeigt ein elektrisches Schutzbauelement in einer Seitenansicht mit rohrförmigen Schmelzelementen an den Stirnseiten,FIG. 1a shows an electrical protection component in a side view with tubular fusible elements on the end faces;
Figur Ib zeigt das elektrische Schutzbauelement gemäß FigurFIG. 1b shows the electrical protection component according to FIG
Ia von der Stirnseite,Yes, from the front,
Figur 2a zeigt ein elektrisches Schutzbauelement in einerFIG. 2a shows an electrical protection component in one
Seitenansicht mit quaderförmigen Schmelzelementen zwischen dem Überspannungsabieiter und demSide view with cuboid melting elements between the surge arrester and the
Kurzschlussbügel ,Shorting bar,
Figur 2b zeigt das elektrische Schutzbauelement gemäß FigurFIG. 2b shows the electrical protection component according to FIG
2a von der Stirnseite. In den Figuren Ia und Ib ist ein elektrisches2a from the front. In the figures Ia and Ib is an electrical
Schutzbauelement dargestellt, das einen Überspannungsabieiter 1 mit zwei Hohlkörpern 9 und drei Elektroden 2, 6 umfasst. Der Überspannungsableiter 1 weist an den Stirnseiten jeweils eine Elektrode 2 auf. Zwischen den stirnseitig angeordneten Elektroden 2 weist der Überspannungsableiter 1 in der dargestellten Ausführungsform eine mittlere Elektrode 6 auf. Die Elektroden 2 und die mittlere Elektrode 6 sind mit Anschlussdrähten 7 versehen. An dem Überspannungsableiter 1 ist ein Kurzschlussbügel 5 angeordnet, der einen elektrischen Kontakt zu der mittleren Elektrode 6 aufweist.Protective device shown comprising a surge arrester 1 with two hollow bodies 9 and three electrodes 2, 6. The surge arrester 1 has at the end faces in each case an electrode 2. Between the frontally arranged electrodes 2, the surge arrester 1 in the illustrated embodiment has a central electrode 6. The electrodes 2 and the middle electrode 6 are provided with connecting wires 7. At the surge arrester 1, a shorting bar 5 is arranged, which has an electrical contact to the central electrode 6.
An den stirnseitigen Elektroden 2 des Überspannungsabieiters 1 ist jeweils ein Schmelzelement 3 angeordnet. Das Schmelzelement 3 weist einen Hohlraum 4 auf . DasAt the front-side electrodes 2 of the surge arrester 1, a fusible element 3 is arranged in each case. The melting element 3 has a cavity 4. The
Schmelzelement 3 ist vorzugsweise derart zwischen der Elektrode 2 und dem Kurzschlussbügel 5 angeordnet, so dass die größte Steifigkeit des Schmelzelements 3 in Richtung der auf das Schmelzelement 3 gerichteten Druckkraft des Kurzschlussbügels 5 gerichtet ist. In dem dargestellten Ausführungsbeispiel weist das Schmelzelement 3 eine rohrförmige Gestalt auf, wobei das Schmelzelement 3 mit den Öffnungen des Rohres in Richtung Elektrode 2 beziehungsweise in Richtung Kurzschlussbügel 5 ausgerichtet ist. Ein rohrförmiger Körper weist in einer derartigen Anordnung seine größte Steifigkeit bezüglich einer senkrecht in Richtung der Längsachse auf das Rohr wirkenden Kraft auf . Durch eine derartige Anordnung ist es möglich, ein Schmelzelement 3 zu verwenden, das im Vergleich zu seinen Abmessungen nur wenig Material aufweist. Der rohrförmige Körper des Schmelzelements 3 weist einen Schlitz 8 auf, durch den der Anschlussdraht 7 der Elektrode 2 geführt ist. Der Schlitz 8 ist in der Figur Ib dargestellt. In einer weiteren Ausführungsform kann es sich auch um einen 2 -Elektroden-Ableiter handeln, wobei der Kurzschlussbügel in diesem Falle beispielsweise mittels eines Rings oder eine Klammer im Bereich des Hohlkörpers mit dem Überspannungsabieiter mechanisch verbunden ist.Melting element 3 is preferably arranged between the electrode 2 and the shorting bar 5, so that the greatest rigidity of the melting element 3 is directed in the direction of the pressing force of the shorting bar 5 directed towards the melting element 3. In the illustrated embodiment, the fusible element 3 has a tubular shape, wherein the fusible element 3 is aligned with the openings of the tube in the direction of electrode 2 and in the direction of shorting bar 5. A tubular body in such an arrangement has its greatest rigidity with respect to a force acting perpendicularly on the tube in the direction of the longitudinal axis. Such an arrangement makes it possible to use a fusible element 3 which has only a small amount of material compared to its dimensions. The tubular body of the fusible element 3 has a slot 8, through which the connecting wire 7 of the electrode 2 is guided. The slot 8 is shown in FIG. In a further embodiment, it may also be a 2-electrode arrester, wherein the short-circuit bar is mechanically connected in this case, for example by means of a ring or a clamp in the region of the hollow body with the surge arrester.
Die Figur Ib zeigt eine Ansicht des elektrischen Schutzbauelements aus Figur Ia mit Blick auf die Stirnseite des Überspannungsabieiters 1. Das rohrförmige Schmelzelement 3 weist einen Schlitz 8 auf, durch den der Anschlussdraht 7 der Elektrode 2 geführt ist. Bei dem dargestellten elektrischen Schutzbauelement handelt es sich um einen 3- Elektroden-Ableiter. Eine dritte, mittlere Elektrode 6 weist einen elektrischen Kontakt zu dem Kurzschlussbügel 5 auf. Im Falle einer unzulässig hohen Erwärmung desFIG. 1 b shows a view of the electrical protection component from FIG. 1 a, with a view of the end face of the surge arrester 1. The tubular fusible element 3 has a slot 8, through which the connection wire 7 of the electrode 2 is guided. The illustrated electrical protection device is a 3-electrode arrester. A third, middle electrode 6 has an electrical contact to the shorting bar 5. In case of excessive heating of the
Überspannungsableiters 1 verbindet der Kurzschlussbügel 5 die Elektroden 2 des Überspannungsableiters 1 mit der mittleren Elektrode 6. In dem dargestellten Ausführungsbeispiel weist die mittlere Elektrode 6 einen größeren Durchmesser als der Körper des Überspannungsableiters 1 auf.Surge arrester 1 connects the shorting bar 5, the electrodes 2 of the surge arrester 1 with the central electrode 6. In the illustrated embodiment, the central electrode 6 has a larger diameter than the body of the surge arrester 1.
In den Figuren 2a und 2b ist ein weiteres Ausführungsbeispiel eines elektrischen Schutzbauelements dargestellt. Der Überspannungsabieiter 1 des elektrischen Schutzbauelements weist zwei Hohlkörper 9 und wenigstens zwei Elektroden 2 auf. In dem dargestellten Ausführungsbeispiel handelt es sich um einen 3 -Elektroden-Ableiter, der eine dritte, mittlere Elektrode 6 aufweist. Die Elektroden 2 und die mittlere Elektrode 6 sind zu Montagezwecken mit Anschlussdrähten 7 versehen. Der Überspannungsabieiter 1 ist mit einerFIGS. 2 a and 2 b show a further exemplary embodiment of an electrical protection component. The surge arrester 1 of the electrical protection component has two hollow bodies 9 and at least two electrodes 2. In the illustrated embodiment, it is a 3-electrode arrester having a third, central electrode 6. The electrodes 2 and the middle electrode 6 are provided with lead wires 7 for mounting purposes. The surge arrester 1 is provided with a
Kurzschlusseinrichtung versehen, die einen Kurzschlussbügel 5 umfasst . Der Kurzschlussbügel 5 ist mittels Schmelzelementen 3 von den Elektroden 2 des Überspannungsableiters 1 beabstandet. Der Kurzschlussbügel 5 ist vorgespannt und drückt auf die Schmelzelemente 3. Im Falle einer unzulässig starken Erwärmung des Überspannungsabieiters 1 schmelzen die Schmelzelemente 3, wodurch der Kurzschlussbügel 5 einen elektrischen Kontakt zwischen den Elektroden 2 erzeugt.Short-circuit device provided which includes a shorting bar 5. The shorting bar 5 is by means of fusible elements 3 of the electrodes 2 of the surge arrester. 1 spaced. The shorting bar 5 is biased and presses on the fusible elements 3. In the case of excessive heating of the Überspannungsabieiters 1 melt the fusible elements 3, whereby the shorting bar 5 generates an electrical contact between the electrodes 2.
Dadurch wird ein Kurzschluss zwischen den beiden Elektroden 2 erzeugt, wodurch sich der Überspannungsabieiter 1 nicht weiter aufheizt.As a result, a short circuit between the two electrodes 2 is generated, as a result of which the surge arrester 1 no longer heats up.
In dem dargestellten Ausführungsbeispiel verbindet derIn the illustrated embodiment, the connects
Kurzschlussbügel 5 die beiden Elektroden 2 mit der mittleren Elektrode 6. Das Schmelzelement 3 weist vorzugsweise einen Hohlraum 4 auf. Dadurch weist das Schmelzelement 3 eine im Vergleich zum Volumen des Schmelzelements 3 geringe Materialmenge auf . Durch die verringerte Materialmenge des Schmelzelements 3 schmilzt das Schmelzelement 3 bei unzulässig starker Erwärmung des Überspannungsabieiters 1 schneller, als ein massives Schmelzelement 3. Der Hohlraum 4 des Schmelzelements 3 ist vorzugsweise derart angeordnet, dass das Schmelzelement 3 in Richtung der auf das Schmelzelement 3 einwirkenden Druckkraft durch den Kurzschlussbügel 5 seine größte Steifigkeit aufweist.Shorting bar 5, the two electrodes 2 with the middle electrode 6. The fusible element 3 preferably has a cavity 4. As a result, the melting element 3 has a small quantity of material compared to the volume of the melting element 3. Due to the reduced amount of material of the fusible element 3, the fusible element 3 melts faster than a solid fusible element 3 if the surge arrester 1 is excessively heated. The cavity 4 of the fusible element 3 is preferably arranged such that the fusible element 3 acts in the direction of the compressive force acting on the fusible element 3 has its greatest rigidity by the shorting bar 5.
Die Figur 2b zeigt eine Ansicht des elektrischen Schutzbauelements aus Figur 2a von seiner Stirnseite. Zum Schutz vor unzulässig starker Erwärmung und der daraus resultierenden möglichen Zerstörung des Überspannungsabieiters 1, weist dieser eine Kurzschlusseinrichtung auf. Die Kurzschlusseinrichtung umfasst einen Kurzschlussbügel 5 der mittels zweier Schmelzelemente 3 von den Elektroden 2 des Überspannungsabieiters 1 beabstandet ist. Der Kurzschlussbügel 5 weist einen elektrischen Kontakt zu einer - S -FIG. 2b shows a view of the electrical protection component from FIG. 2a from its front side. To protect against excessive heating and the resulting possible destruction of the surge arrester 1, this has a short-circuit device. The short-circuiting device comprises a shorting bar 5, which is spaced apart from the electrodes 2 of the surge arrester 1 by means of two fusible elements 3. The shorting bar 5 has an electrical contact with a - S -
mittleren Elektrode 6 des Überspannungsabieiters 1 auf. Im Falle unzulässig starker Erwärmung des Überspannungsabieiters 1 schmelzen die Schmelzelemente 3 und der Kurzschlussbügel 5 erzeugt zwischen den beiden Elektroden 2 und der mittleren Elektrode 6 einen Kurzschluss.middle electrode 6 of the surge arrester 1. In the case of excessively high heating of the surge arrester 1, the fusible elements 3 melt and the short-circuit bar 5 generates a short circuit between the two electrodes 2 and the middle electrode 6.
Obwohl in den Ausführungsbeispielen nur eine beschränkte Anzahl möglicher Weiterbildung der Erfindung beschrieben werden konnte ist die Erfindung nicht auf diese beschränkt. Es ist prinzipiell möglich jede beliebige Form desAlthough only a limited number of possible developments of the invention could be described in the embodiments, the invention is not limited to these. It is possible in principle any form of the
Schmelzelements zu verwenden, wobei geometrische Formen, die einen oder mehrere Hohlräume aufweisen und dadurch eine im Vergleich zu einem massiven Schmelzelement eine geringere Materialmenge aufweisen, besonders geeignet sind.To use fusible element, wherein geometric shapes, which have one or more cavities and thereby have a compared to a solid fusible element, a smaller amount of material, are particularly suitable.
Die Erfindung ist nicht auf die Anzahl der dargestellten Elemente beschränkt.The invention is not limited to the number of elements shown.
Die Beschreibung der hier angegebenen Gegenstände ist nicht auf die einzelnen speziellen Ausführungsformen beschränkt vielmehr können die Merkmale der einzelnen Ausführungsformen soweit technisch sinnvoll beliebig miteinander kombiniert werden. The description of the objects specified here is not limited to the individual specific embodiments, but rather the features of the individual embodiments can be combined with one another as far as is technically feasible.
__
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Uberspannungsableiter1 surge arrester
2 Elektroden2 electrodes
3 Schmelzelement3 fusible element
4 Hohlraum4 cavity
5 Kurzschlussbügel5 shorting bars
6 Mittelelektrode6 center electrode
7 Anschlussdraht7 connecting wire
8 Schlitz8 slot
9 Hohlkörper 9 hollow body

Claims

Patentansprüche claims
1. Elektrisches Schutzbauelement mit Kurzschlusseinrichtung, aufweisend: - einen Überspannungsabieiter (1) , der wenigstens zwei Elektroden (2) aufweist,1. An electrical protection device with a short-circuit device, comprising: - an overvoltage arrester (1) having at least two electrodes (2),
- wenigstens ein Schmelzelement (3) , das eine geometrische Form aufweist, die wenigstens einen Hohlraum (4) umfasst , - einen Kurzschlussbügel (5) , der an dem- At least one fusible element (3) having a geometric shape, which comprises at least one cavity (4), - a shorting bar (5) on the
Überspannungsabieiter (1) angeordnet ist,Surge Arrester (1) is arranged,
- wobei der Kurzschlussbügel (5) auf das Schmelzelement- The shorting bar (5) on the fuse
( 3 ) drückt ,(3) presses,
- wobei der Kurzschlussbügel (5) mittels des Schmelzelements (3) von den Elektroden (2) beabstandet ist.- Wherein the shorting bar (5) by means of the fusible element (3) from the electrodes (2) is spaced.
2. Elektrisches Schutzbauelement nach Anspruch 1, wobei das Schmelzelement (3) rohrförmig ausgebildet ist.2. Electrical protection component according to claim 1, wherein the fusible element (3) is tubular.
3. Elektrisches Schutzbauelement nach Anspruch 1, wobei das Schmelzelement (3) die Form eines Hohlquaders aufweist.3. Electrical protection component according to claim 1, wherein the fusible element (3) has the shape of a hollow cuboid.
4. Elektrisches Schutzbauelement nach Anspruch 1, wobei das Schmelzelement (3) eine geometrische Form aufweist, die wenigstens einen Knick aufweist.4. Electrical protection component according to claim 1, wherein the fusible element (3) has a geometric shape having at least one kink.
5. Elektrisches Schutzbauelement nach Anspruch 1, wobei das Schmelzelement (3) eine gefaltete Folie umfasst.5. Electrical protection component according to claim 1, wherein the fusible element (3) comprises a folded film.
6. Elektrisches Schutzbauelement nach einem der vorhergehenden Ansprüche, wobei das Schmelzelement (3) an wenigstens einer Stirnseite des Überspannungsabieiters (1) angeordnet ist.6. Electrical protection component according to one of the preceding claims, wherein the fusible element (3) is arranged on at least one end face of the surge arrester (1).
7. Elektrisches Schutzbauelement nach einem der vorhergehenden Ansprüche, wobei das Schmelzelement (3) bei unzulässig starker Erwärmung des ϋberspannungsableiters (1) schmilzt.7. Electrical protection component according to one of the preceding claims, wherein the melting element (3) melts in excessively high heating of the surge arrester (1).
8. Elektrisches Schutzbauelement nach einem der vorhergehenden Ansprüche, wobei der Kurzschlussbügel (5) eine elektrische Verbindung zu einer Mittelelektrode (6) aufweist .8. Electrical protection component according to one of the preceding claims, wherein the shorting bar (5) has an electrical connection to a center electrode (6).
9. Elektrisches Schutzbauelement nach einem der vorhergehenden Ansprüche, wobei das Schmelzelement (3) einen isolierenden Kunststoff umfasst.9. Electrical protection component according to one of the preceding claims, wherein the fusible element (3) comprises an insulating plastic.
10. Elektrisches Schutzbauelement nach einem der vorhergehenden Ansprüche, wobei das Schmelzelement (3) ein Spritzgussformteil ist.10. Electrical protection component according to one of the preceding claims, wherein the fusible element (3) is an injection molded part.
11. Elektrisches Schutzbauelement nach einem der vorhergehenden Ansprüche, wobei die Steifigkeit des Schmelzelements (3) in Richtung der vom Kurzschlussbügel (5) ausgeübten Druckkraft am größten ist. 11. Electrical protection component according to one of the preceding claims, wherein the stiffness of the fusible element (3) in the direction of the shorting bar (5) exerted compressive force is greatest.
EP09706372A 2008-01-31 2009-01-27 Electric protective component with a short-circuit device Not-in-force EP2238658B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008006992 2008-01-31
DE102008022833A DE102008022833A1 (en) 2008-01-31 2008-05-08 Electrical protection component with short-circuit device
PCT/EP2009/000514 WO2009095205A1 (en) 2008-01-31 2009-01-27 Electric protective component with a short-circuit device

Publications (2)

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EP2238658A1 true EP2238658A1 (en) 2010-10-13
EP2238658B1 EP2238658B1 (en) 2013-03-13

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US (1) US8274775B2 (en)
EP (1) EP2238658B1 (en)
JP (1) JP5466178B2 (en)
KR (1) KR20100117623A (en)
CN (1) CN101933203B (en)
DE (1) DE102008022833A1 (en)
WO (1) WO2009095205A1 (en)

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KR20100117623A (en) 2010-11-03
US8274775B2 (en) 2012-09-25
JP2011511405A (en) 2011-04-07
CN101933203A (en) 2010-12-29
CN101933203B (en) 2015-02-25
WO2009095205A1 (en) 2009-08-06
EP2238658B1 (en) 2013-03-13
US20110013334A1 (en) 2011-01-20
DE102008022833A1 (en) 2009-08-06
JP5466178B2 (en) 2014-04-09

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