EP1977434B1 - Cage-type surge arrester and method for producing the same - Google Patents

Cage-type surge arrester and method for producing the same Download PDF

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Publication number
EP1977434B1
EP1977434B1 EP06830827A EP06830827A EP1977434B1 EP 1977434 B1 EP1977434 B1 EP 1977434B1 EP 06830827 A EP06830827 A EP 06830827A EP 06830827 A EP06830827 A EP 06830827A EP 1977434 B1 EP1977434 B1 EP 1977434B1
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EP
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Prior art keywords
surge arrester
varistor
hole
end fitting
end fittings
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EP06830827A
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German (de)
French (fr)
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EP1977434A1 (en
Inventor
Hartmut Klaube
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Tridelta Ueberspannungsableiter GmbH
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Tridelta Ueberspannungsableiter GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H01C7/123—Arrangements for improving potential distribution
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Fuses (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a surge arrester having a cage design, and to a method for its production. According to the invention, during extrusion-coating or encapsulation of a module comprising two end fittings (3) and a plurality of varistor blocks (1) and at least one reinforcing element (9) in order to form the outer housing (5), first through-holes (11) for the reinforcing element (9) thereof are sealed with silicone. For this purpose, second through-holes (15) are provided in the end fittings (3), through which the silicone runs during casting or spraying, and enters the through-holes (11) from the outside, in order in this way to seal them against water and moisture.

Description

Die Erfindung betrifft einen Überspannungsableiter mit Käfig-Design wie er beispielsweise aus der JP 62-149511 (Anmeldenummer) bekannt ist, und ein Verfahren zur Herstellung eines derartigen Überspannungsableiters.The invention relates to a surge arrester with cage design as he, for example, from JP 62-149511 (Application number), and a method for manufacturing such a surge arrester.

Überspannungsableiter werden bei Stromversorgungssystemen zwischen stromführenden Leitungen und Masse geschaltet um im Fall einer Überspannung in der Leitung diese zur Masse abzuleiten und so andere Bauteile des Stromnetzes zu schützen. Ein derartiger Überspannungsableiter enthält einen Stapel Varistorblöcke, der zwischen zwei Anschlusselementen bzw. Endarmaturen gehalten ist. Diese Anordnung wird in einem Gehäuse aufgenommen.Surge arresters are connected in power supply systems between live lines and ground in order to derive in the case of an overvoltage in the line this to ground and to protect other components of the power grid. Such a surge arrester contains a stack of varistor blocks, which is held between two connection elements or end fittings. This arrangement is accommodated in a housing.

Um sicherzustellen, dass auch bei mechanischen Belastungen die Varistorblöcke gut miteinander kontaktieren ist es erforderlich, den Stapel unter Druck zusammenzuhalten. Bei Überspannungsableitern mit Käfig-Design erfolgt dies über Verstärkungselemente, in der Regel Stäbe oder Seile, vorzugsweise glasfaserverstärkte Kunststoffstäbe (GFK-Stäbe), die an den beiden Endarmaturen unter Zug gehalten sind.To ensure that the varistor blocks contact each other well even under mechanical loads, it is necessary to hold the stack together under pressure. In surge arresters with cage design, this is done via reinforcing elements, usually rods or ropes, preferably glass fiber reinforced plastic rods (GRP rods), which are held on the two end fittings under train.

Ein Problem bei derartigen Überspannungsableitern besteht darin, die Verstärkungselemente sicher an den Endarmaturen zu befestigen, so dass auch bei mechanischen Beanspruchungen, wie sie bei im Freien montierten Überspannungsableitern auftreten, die nötige Festigkeit erhalten wird.A problem with such surge arresters is to securely fasten the reinforcing elements to the end fittings, so that the necessary strength is obtained even in the case of mechanical stresses which occur in the case of surge arresters mounted outdoors.

Bei der genannten japanischen Patentanmeldung wird dieses Problem dadurch gelöst, dass in den Endarmaturen Nuten in Stapelrichtung der Varistorblöcke vorgesehen sind, in die die Verstärkungselemente eingelegt werden und wobei das Ende der Verstärkungselemente mit einem Gewinde ausgestattet ist, auf das eine Mutter aufgeschraubt wird, die im Durchmesser größer als die Nut in der Endarmatur ist, und so das Verstärkungselement im wesentlichen durch Formschluss hält.In the said Japanese patent application, this problem is solved in that in the end fittings grooves in the stacking direction of the varistor blocks are provided, in which the reinforcing elements are inserted and wherein the end of the reinforcing elements is provided with a thread, on which a nut is screwed, which is larger in diameter than the groove in the end fitting, and thus holds the reinforcing element substantially by positive engagement.

Gemäß einer weiteren bekannten Technik, wie sie in dem europäischen Patent EP 0646276 (Anmeldenummer 93 915 343.3 ) offenbart ist, können die glasfaserverstärkten Kunststoffstäbe auch durch Stifte oder Schrauben, senkrecht zur Längsrichtung der Stäbe an den Endarmaturen gehalten werden.According to another known technique, as described in the European patent EP 0646276 (Application No. 93 915 343.3 ), the glass fiber reinforced plastic rods can also be held by pins or screws, perpendicular to the longitudinal direction of the rods to the end fittings.

Bei den beiden genannten Techniken besteht ein Problem darin, dass die vorspringenden Ecken der Muttern und Schrauben zu einer Konzentration des elektrischen Feldes und der Gefahr von Teilentladungen führt.One problem with the two mentioned techniques is that the projecting corners of the nuts and bolts lead to a concentration of the electric field and the risk of partial discharges.

Die deutsche Patentanmeldung DE 199 40 939 zeigt eine weitere Möglichkeit, die Verstärkungselemente in den Endarmaturen zu halten. Hierzu wird in einer konischen Bohrung der Endarmatur eine in Richtung der Stapelmitte der Varistorblöcke konisch zulaufende Hülse mit beweglichen Seitenwänden eingesetzt, die als Klemmhülse, ähnlich einem Keil, das zugehörige Verstärkungselement unter Zug fest durch reib- bzw. kraftschlüssige Verbindung hält.The German patent application DE 199 40 939 shows another way to hold the reinforcing elements in the end fittings. For this purpose, in a conical bore of the end fitting in the direction of the stack center of the varistor blocks tapered sleeve is used with movable side walls, which holds as a clamping sleeve, similar to a wedge, the associated reinforcing element under train firmly by frictional or non-positive connection.

Mit dieser Technik können vorspringende Kanten von Schrauben oder Muttern vermieden werden, jedoch besteht ein Problem darin, dass durch die Durchgangslöcher in der Endarmatur, durch die die glasfaserverstärkten Stäbe laufen und in denen die Klemmhülsen eingesetzt sind, Feuchtigkeit bzw. Wasser in das Innere des Überspannungsableiters gelangt, und diesen auf Dauer schädigt.With this technique, projecting edges of screws or nuts can be avoided, but there is a problem that through the through holes in the end fitting through which run the glass fiber reinforced rods and in which the ferrules are inserted, moisture or water into the interior of the surge arrester and damages it permanently.

Daher war es bei dieser Technik erforderlich, entweder die Endarmatur komplett bei der Ausbildung eines Außengehäuses mit in dieses zu integrieren, beispielsweise indem die Endarmatur mit umspritzt wurde, oder es mussten zusätzliche Maßnahmen ergriffen werden, um die Endarmatur auf ihrer oberen Seite gegen das Eindringen von Feuchtigkeit zu schützen. Diese bekannten Techniken haben entweder den Nachteil, dass eine große Menge des relativ teuren Materials für das Außengehäuse, meistens niederviskoses Silikon, benötigt wird, um die gesamte Endarmatur zu umspritzen, oder ein zusätzlicher Arbeitsschritt erforderlich war, um die zusätzliche Abdichtung anzubringen.Therefore, it was necessary in this technique, either to integrate the end fitting completely in the formation of an outer housing in this, for example by the end fitting was overmolded, or additional measures had to be taken to the end fitting on its upper side against the ingress of To protect moisture. These known techniques either have the disadvantage that a large amount of the relatively expensive material for the outer housing, usually low viscosity silicone, is needed to overmold the entire end fitting, or An additional operation was required to attach the additional seal.

Die Erfindung hat die Aufgabe, einen Überspannungsableiter mit Käfig-Design bereitzustellen, der weder das Problem der Teilentladung aufgrund von vorspringenden Kanten von Schrauben oder Muttern hat, noch bei dem Probleme durch das Eindringen von Feuchtigkeit durch Durchgangslöcher der Endarmatur auftreten.The invention has for its object to provide a surge arrester with cage design, which has neither the problem of partial discharge due to protruding edges of screws or nuts, nor occur in the problems of penetration of moisture through through holes of the end fitting.

Erfindungsgemäß wird dieses Problem durch einen Überspannungsableiter nach Anspruch 1 und ein Verfahren zum Herstellen eines derartigen Überspannungsableiters nach Anspruch 7 gelöst. Die abhängigen Ansprüche betreffen weitere Vorteilhafte Aspekte der Erfindung.According to the invention this problem is solved by a surge arrester according to claim 1 and a method for producing such a surge arrester according to claim 7. The dependent claims relate to further advantageous aspects of the invention.

Im folgenden werden bevorzugte Ausführungsformen des Überspannungsableiters unter Bezugnahme auf die Zeichnungen beschrieben, in denen zeigt:

Fig. 1
eine Gesamtansicht eines Überspannungsableiters mit teilweise weggeschnittenem Außengehäuse;
Fig. 2
eine Aufsicht auf die Endarmatur des erfindungsgemäßen Überspannungsableiters;
Fig. 3
eine Schnittansicht durch eine Endarmatur nach Fig. 2.
In the following, preferred embodiments of the surge arrester will be described with reference to the drawings, in which:
Fig. 1
an overall view of a surge arrester with partially cutaway outer housing;
Fig. 2
a plan view of the end fitting of the surge arrester according to the invention;
Fig. 3
a sectional view through an end fitting after Fig. 2 ,

Der in Fig. 1 gezeigte Überspannungsableiter mit Käfig-Design enthält mindestens einen Varistorblock 1. Als Varistorblöcke 1 können bekannte Keramikscheiben mit einem spannungsabhängigen Widerstand (variable resistor) verwendet werden. Bei niedrigen Spannungen arbeiten sie als nahezu perfekte Isolatoren, während sie bei hoher Spannung eine gute Leitfähigkeit haben. Handelsübliche Varistorblöcke werden auf Grundlage von Zinkoxid (ZnO) hergestellt. Die Erfindung ist jedoch nicht auf derartige Zinkoxidüberspannungsableiter beschränkt, und auch andere Metalloxide und auch Siliziumkarbid können beispielsweise für den Varistorblock verwendet werden. Außerdem können zusätzlich zu Varistorblöcken 1 noch weitere Blöcke, etwa Metallblöcke, oder Funkenstreckenblöcke, in dem Stapel enthalten sein, um so die Länge des Überspannungsableiters an die Erfordernisse des jeweiligen Einsatzes anzupassen.The in Fig. 1 Cage design surge arresters shown include at least one varistor block 1. As the varistor blocks 1, known ceramic disks having a variable resistor can be used. At low voltages they work as near-perfect insulators, while at high voltages they have good conductivity. Commercially available varistor blocks are manufactured on the basis of zinc oxide (ZnO). However, the invention is not limited to such zinc oxide surge arresters, and other metal oxides as well as silicon carbide may be used for the varistor block, for example. In addition, in addition to varistor blocks 1, further blocks, such as metal blocks, or spark gaps, may be included in the stack to adapt the length of the surge arrester to the requirements of the particular application.

Gängige Varistorblöcke 1 sind als Kreiszylinder mit einem Durchmesser von beispielsweise 5 cm und einer Höhe von etwa 4 cm ausgebildet. An beiden Seiten der Varistorblöcke 1 sind nicht detailliert gezeigte Aluminiumelektroden aufgebracht, um eine bessere Kontaktierung sicherzustellen. Auch ist es üblich, zwischen den Varistorblöcken 1 zur weiteren Verbesserung der Kontaktierung ebenfalls nicht gezeigte dünne Aluminiumscheiben oder Federelemente zu legen.Common varistor blocks 1 are formed as circular cylinders with a diameter of for example 5 cm and a height of about 4 cm. On both sides of the varistor blocks 1 aluminum electrodes not shown in detail are applied to ensure a better contact. It is also customary to lay between the Varistorblöcken 1 to further improve the contact also not shown thin aluminum discs or spring elements.

In dem Stapel der Varistorblöcke kann außerdem eine Tellerfeder oder ähnliches vorhanden sein, um im Fall von Temperaturschwankungen die Kontaktierung sicher beizubehalten.In addition, a plate spring or the like may be provided in the stack of the varistor blocks to securely maintain contact in the event of temperature variations.

Ein durch Aufeinanderstapeln derartiger Varistorblöcke 1 und eventueller Metallblöcke gebildeter Stapel ist bei dem in Fig. 1 gezeigten Überspannungsableiter zwischen zwei Endarmaturen 3 gehalten. Die Endarmaturen 3 sind üblicherweise aus Aluminium oder Edelstahl gebildet und derart ausgestaltet, dass sie leicht in bestehende elektrische Installationen bzw. Stromversorgungsnetze eingebunden werden können, beispielsweise durch eine aus dem Überspannungsableiter herausragende zentrale Schraube 4, die elektrisch mit den Varistorblöcken 1 gut kontaktiert.A stack formed by stacking such varistor blocks 1 and any metal blocks is shown in FIG Fig. 1 shown surge arrester between two end fittings 3 held. The end fittings 3 are usually formed of aluminum or stainless steel and designed so that they can be easily integrated into existing electrical installations or power grids, for example by a projecting from the surge arrester central screw 4, which makes good contact with the Varistorblöcken 1 well.

Zum Schutz gegenüber der Umwelt werden diese Überspannungsableiter mit einem äußeren Gehäuse 5 aus Silikon umgeben. Das Gehäuse wird durch Spritzen oder Gießen gebildet.To protect against the environment, these surge arresters are surrounded by an outer housing 5 made of silicone. The housing is formed by spraying or pouring.

Zur Vergrößerung des Kriechweges des Stroms sind an der Außenseite des Gehäuses 5 Schirme 7 ausgebildet.To increase the creepage path of the current 5 screens 7 are formed on the outside of the housing.

Überspannungsableiter sind erheblichen Biegemomenten ausgesetzt, wenn sie in der freien Umgebung verwendet werden. Es ist daher erforderlich, sicherzustellen, dass auch bei größeren mechanischen Beanspruchungen die Kontaktierung der Varistorblöcke 1 untereinander und zu den Endarmaturen beibehalten und ein Kantenbruch der Varistorblöcke durch ein inneres Verkannter zweier benachbarter Varistorblöcke vermieden wird. Um dies zu erreichen, werden regelmäßig glasfaserverstärkte Kunststoffstäbe oder Seile 9 als Verstärkungselemente zwischen den beiden Endarmaturen 3 eingespannt. Diese halten die Varistorblöcke 1 zwischen den beiden Endarmaturen 3 unter Zugbeanspruchung zusammen.Surge arresters are exposed to significant bending moments when used in the open environment. It is therefore necessary to ensure that the contacting of the varistor blocks 1 with each other and to the end fittings is maintained even with greater mechanical stresses and an edge fracture of the varistor blocks by an inner Verkannte two adjacent Varistorblöcke is avoided. To achieve this, glass fiber reinforced plastic rods or ropes 9 are clamped as reinforcing elements between the two end fittings 3 regularly. These hold the Varistorblöcke 1 between the two end fittings 3 together under tensile stress.

Im folgenden werden die Verankerungselemente als Stäbe 9 bezeichnet, ohne dass hierin eine Beschränkung der Erfindung zu sehen wäre.Hereinafter, the anchoring elements will be referred to as rods 9, without any limitation of the invention.

Fig. 2 zeigt eine Aufsicht auf eine Endarmatur eines erfindungsgemäßen Überspannungsableiters. Die Endarmatur 3 ist im wesentlichen als kreis-zylindrischer Block ausgebildet, dessen Durchmesser größer als der der Varistorblöcke ist: In dem radialen Bereich der Endarmatur, der über die Varistorblöcke hinausragt sind entlang des Umfangs der Endarmatur in Staplerichtung verlaufende Durchgangslöcher 11 ausgebildet. In der Mitte der Endarmatur in ein weiteres Durchgangsloch 25 für die zentrale Schraube 4, vorzugweise mit einem Innengewinde, ausgebildet. Fig. 2 shows a plan view of an end fitting of a surge arrester according to the invention. The end fitting 3 is formed substantially as a circular-cylindrical block whose diameter is greater than that of the varistor blocks: In the radial region of the end fitting, which projects beyond the Varistorblöcke along the circumference of the end fitting in the stacking direction extending through holes 11 are formed. In the middle of the end fitting in a further through hole 25 for the central screw 4, preferably with an internal thread formed.

Bei dem erfindungsgemäßen Überspannungsableiter sind die glasfaserverstärkten Kunststoffstäbe 9 in Durchgangslöchern 11 durch die Endarmaturen 3 aufgenommen. In diesen Durchgangslöchern sind die glasfaserverstärkten Kunststoffstäbe durch geeignete Mittel, etwa Keile, Keilhülsen, Klebung, Krimphülsen oder ähnliches festgehalten.In the surge arrester according to the invention, the glass fiber reinforced plastic rods 9 are received in through holes 11 through the end fittings 3. In these through holes, the glass fiber reinforced plastic rods are held by suitable means, such as wedges, wedge sleeves, gluing, Crimpers or the like.

Die Endarmatur weist zusätzlich zumindest ein zweites Durchgangsloch 15 auf. Dieses Durchgangsloch 15, in dem kein Verstärkungselement aufgenommen wird, dient als Durchflussverbindung zwischen den beiden Seiten der Endarmatur während des Ausbildens des Außenghäuses durch Spritzne oder Gießen.The end fitting additionally has at least one second through-hole 15. This through-hole 15, in which no reinforcing element is received, serves as a flow connection between the two sides of the end fitting during the formation of the outer casing by splashing or casting.

Außerdem ist bei der gezeigten Endarmatur die dem Stapel der Varistorblöcke abgewandte Seite der Endarmatur mit einer unlaufenden Nut oder Rille 17 versehen, in der die ersten und zweiten Durchgangslöcher 11 und 15 münden. Die Nut wird von einem vorspringenden äußeren Rand 19 und einem inneren Rand 21 begrenzt.Moreover, in the illustrated end fitting, the side of the end fitting facing away from the stack of varistor blocks is provided with a running groove or groove 17 in which the first and second through holes 11 and 15 open. The groove is bounded by a projecting outer edge 19 and an inner edge 21.

Um zu verhindern, dass von außen durch diese Durchgangsbohrung Feuchtigkeit in das Innere des Überspannungsableiters eindringt, ist es erforderlich Maßnahmen zu ergreifen, um die Durchgangslöcher 11 gegen Wasser zu versiegeln.In order to prevent moisture from entering the interior of the surge arrester from outside through this through-hole, it is necessary to take measures to seal the through-holes 11 against water.

Bei dem erfindungsgemäßen Überspannungsableiter wird zunächst der Käfig aus zwei Endarmaturen 3, den Varistorblöcken 1 und den glasfaserverstärkten Stäben 9, in fester Verbindung mit den Endarmaturen 3 gebildet. Dieser Käfig wird dann in ein Formwerkzeug gelegt, das an jeweiligen Schultern 23 der Endarmatur, wie sie in Fig. 3 gezeigt sind, dicht abschließt. Das Formwerkzeug kann so ausgebildet sein, dass gleichzeitig mit dem Außengehäuse 5 auch die Schirme 7 durch Spritzen bzw. Gießen von Silikon gebildet werden.In the surge arrester according to the invention, the cage is first formed from two end fittings 3, the varistor blocks 1 and the glass fiber reinforced rods 9, in fixed connection with the end fittings 3. This cage is then placed in a mold attached to respective shoulders 23 of the end fitting as shown in Figs Fig. 3 are shown, tightly closes. The mold can be designed so that simultaneously with the outer housing 5 and the screens 7 are formed by spraying or molding of silicone.

Niederviskoses Silikon, wie es für diese Anwendung bevorzugt ist, ist relativ teuer. Daher ist, wie es in Fig. 1 zu sehen ist, das Gehäuse im Bereich der Varistorblöcke 1 eingezogen, d.h. weist einen geringeren Querschnitt auf, als im Bereich der Überlappung mit der Endarmatur 3.Low viscosity silicone, as preferred for this application, is relatively expensive. Therefore, as it is in Fig. 1 can be seen, the housing in the area of the Varistorblöcke 1 retracted, ie has a smaller cross-section than in the region of the overlap with the end fitting. 3

Erfindungsgemäß sind in den Endarmaturen 3 zusätzlich zu den ersten Durchgangslöchern 11, in denen die glasfaserverstärkten Stäbe 9 aufgenommen sind, noch die zweiten Durchgangslöcher 15 ausgebildet. Das der Außenseite des Überspannungsableiters zugewandte Ende dieser Löcher ist, wie ausgeführt wurde, in der Nut 17 angebracht. Vorzugsweise sind mehrere zweite Durchgangslöcher vorgesehen. Auch ist es möglich, anstelle der durchgehenden Umfangsnut 17 mehrere Teilsegmentnuten vorzusehen, die sich jeweils nur über ein Segment des Umfangs erstrecken, wobei jedes erste Durchgangsloch 11 zusammen mit zumindest einem zweiten Durchgangsloch 15 in einer der Teilsegmentnuten 17 mündet.According to the invention, in addition to the first through-holes 11, in which the glass-fiber-reinforced rods 9 are accommodated, the second through-holes 15 are also formed in the end fittings 3. The outside of the surge arrester facing the end of these holes is, as stated, mounted in the groove 17. Preferably, a plurality of second through holes are provided. It is also possible, instead of the continuous circumferential groove 17, to provide a plurality of sub-segment grooves each extending over only one segment of the circumference, each first through-hole 11 opening into one of the sub-segment grooves 17 together with at least one second through-hole 15.

Bei der Herstellung des Überspannungsableiters wird eine Platte 27 mittels einer zentralen Schraube 4 in die mittlere Bohrung mit Innengewinde 23 der Endarmatur 3 gehalten. in Fig. 1 gezeigte Platte 27 schließt am Rand der Endarmatur 3 flächig mit dem Rand 19 dicht ab, wobei ein Hohlraum im Bereich der Nut 17 verbleibt. Nach Bedarf können in der Platte einzelne Entlüftungslöcher vorgesehen werden.In the manufacture of the surge arrester a plate 27 is held by means of a central screw 4 in the central bore with internal thread 23 of the end fitting 3. in Fig. 1 shown plate 27 closes at the edge of the end fitting 3 areally with the edge 19 from tight, with a cavity in the Area of the groove 17 remains. If required, individual vent holes can be provided in the plate.

Beim Gießen des Außengehäuses sind üblicherweise eine oder mehrere Einlassöffnungen für das niederviskose Silikon im Bereich der Schirme 7 und korrespondierende Belüftungslöcher, ebenfalls im Bereich der Schirme 7, vorgesehen. Das Silikon dringt in die Form ein, bildet das Außengehäuse 5 mit den Schirmen 7, läuft dabei durch die Durchgangslöcher 15 und die Nuten 17 und von weiter in die Durchgangslöcher 11 mit den glasfaserverstärkten Stäben. Auf diese Art werden die Durchgangslöcher 11 mit den glasfaserverstärkten Kunststoffstäben 9 von außen hermetisch verschlossen und gegen Feuchtigkeit in einem Arbeitsgang mit der Ausbildung des Außengehäuses geschützt.When casting the outer housing, one or more inlet openings for the low-viscosity silicone in the region of the screens 7 and corresponding ventilation holes, also in the area of the screens 7, are usually provided. The silicone penetrates into the mold, forms the outer casing 5 with the sheds 7, passes through the through-holes 15 and the grooves 17 and further into the through-holes 11 with the glass fiber reinforced rods. In this way, the through holes 11 are hermetically sealed with the glass fiber reinforced plastic rods 9 from the outside and protected against moisture in one operation with the formation of the outer casing.

Wie in Fig. 2 zu sehen ist, ist es bevorzugt ein zweites Durchgangsloch 15 für zwei erste Durchgangslöcher 11 vorzusehen. Dies ist nicht zwingend erforderlich und es kann für jedes erste Durchgangsloch 11 ein zweite Durchgangsloch 15 vorgesehen sein, oder es kann ein einziges zweites Durchgangsloch 15 für alle ersten Durchgangslöcher 11 ausgebildet sein.As in Fig. 2 As can be seen, it is preferable to provide a second through hole 15 for two first through holes 11. This is not absolutely necessary and a second through-hole 15 may be provided for each first through-hole 11, or a single second through-hole 15 may be formed for all the first through-holes 11.

Der Innendurchmesser der zweiten Durchgangslöcher 15 ist derart zu wählen, dass das niederviskose Silikon bei dem Gießvorgang gut hindurchströmen kann.The inner diameter of the second through-holes 15 should be chosen such that the low-viscosity silicone can flow well through the casting process.

Fig. 3 zeigt einen Schnitt durch eine Endarmatur entlang der Linie A-A in Fig. 2. Wie zu sehen ist, sind die zweiten Durchgangslöcher 15 im Querschnitt deutlich kleiner ausgebildet als die ersten Durchgangslöcher 11. Fig. 3 shows a section through an end fitting along the line AA in Fig. 2 , As can be seen, the second through holes 15 are formed in cross section significantly smaller than the first through holes 11th

Obwohl die Erfindung anhand einer bevorzugten Ausführungsform beschrieben wurde, ist die Erfindung nicht auf diese Ausführungsform beschränkt, sondern durch die unabhängigen Ansprüche 1 und 7 definiert.Although the invention has been described in terms of a preferred embodiment, the invention is not limited to this embodiment, but defined by the independent claims 1 and 7.

Claims (7)

  1. Surge arrester comprising:
    at least one varistor block (1);
    two end fittings (3) which are arranged on opposite sides of the varistor block (1);
    at least one reinforcing element (9), which holds the varistor block (1) and the end fittings (3) together and runs through a first hole (11) through at least one of the end fittings (3);
    an outer housing (5) composed of silicone which is formed by casting or spraying around the varistor block (1), the reinforcing element (9) and parts of the end fittings (3);
    characterised in that
    second through-holes (15) are formed in at least one end fitting (3) and open in a groove (17) on that side of the end fitting (3) which faces away from the varistor block (1), with the groove (17) extending from a second through-hole (15) to a first through-hole (11), and with the second through-hole (15), the groove (17) and the first through-hole (11) being sealed with silicone on that side of the end fitting (3) which faces away from the varistor block (1).
  2. Surge arrester according to claim 1, characterised in that the varistor block or blocks (1) is or are formed from a metal oxide, preferably zinc oxide.
  3. Surge arrester according to either claim 1 or claim 2, characterised in that the end fittings (3) are formed from metal, preferably aluminium.
  4. Surge arrester according to any one of the preceding claims, characterised in that the housing (5) of the surge arrester is equipped with screens (7).
  5. Surge arrester according to any one of the preceding claims, characterised in that the reinforcing element (9) is a glass-fibre-reinforced plastics material rod or cable, which holds the end fitting (3) and the varistor block (1) together with a tensile load.
  6. Surge arrester according to claim 5, characterised in that an anchoring element in the form of a wedge or a wedge sleeve holds the glass-fibre-reinforced plastics material rod (9) in the through-hole (11).
  7. Method for producing a surge arrester according to claim 1, comprising the following steps:
    mounting of at least one reinforcing element (9) in a first through-hole (11) in a first end fitting (3);
    arrangement of a stack of varistor blocks (1) on the end fitting (3) and alongside the reinforcing element (9);
    fitting of a second end fitting on the stack of varistor blocks and the reinforcing elements (9) in such a manner that the varistor blocks (1) are located between the two end fittings (3);
    mounting of the reinforcing element (9) in a first through-hole (11) in the second end fitting (3);
    extrusion-coating or encapsulation of parts of the two end fittings (3), of the varistor blocks (1) and of the reinforcing element (9) in order to form an outer housing (5) composed of plastics material, with the plastics material flowing through the second through-holes (15) and the groove (17) in the end fittings (3), and with the first through-holes (11) being sealed on that side of the end fittings (3) which faces away from the varistor blocks (1).
EP06830827A 2006-01-25 2006-12-22 Cage-type surge arrester and method for producing the same Not-in-force EP1977434B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006003579A DE102006003579B4 (en) 2006-01-25 2006-01-25 Surge arrester with cage design and manufacturing process for this
PCT/EP2006/070196 WO2007085338A1 (en) 2006-01-25 2006-12-22 Cage-type surge arrester and method for producing the same

Publications (2)

Publication Number Publication Date
EP1977434A1 EP1977434A1 (en) 2008-10-08
EP1977434B1 true EP1977434B1 (en) 2009-07-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06830827A Not-in-force EP1977434B1 (en) 2006-01-25 2006-12-22 Cage-type surge arrester and method for producing the same

Country Status (15)

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US (1) US8009402B2 (en)
EP (1) EP1977434B1 (en)
JP (1) JP4865816B2 (en)
KR (1) KR101008134B1 (en)
CN (1) CN101336459B (en)
AR (1) AR059152A1 (en)
AT (1) ATE438186T1 (en)
AU (1) AU2006336899B2 (en)
BR (1) BRPI0621242A2 (en)
DE (3) DE102006003579B4 (en)
HK (1) HK1126310A1 (en)
MX (1) MX2008009191A (en)
RU (1) RU2378727C1 (en)
WO (1) WO2007085338A1 (en)
ZA (1) ZA200805315B (en)

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DE102011078210A1 (en) 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Surge arresters
DE102011078207A1 (en) 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Surge arresters
WO2013167440A1 (en) 2012-05-11 2013-11-14 Siemens Aktiengesellschaft Overvoltage arrester with cover and water drain gutter
DE102012207914A1 (en) 2012-05-11 2013-11-14 Siemens Aktiengesellschaft Surge arresters
EP3232448A1 (en) 2016-04-13 2017-10-18 Siemens Aktiengesellschaft Surge arrester
WO2018065034A1 (en) 2016-10-04 2018-04-12 Siemens Aktiengesellschaft Overvoltage arrester assembly and method for setting same

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DE102009035646A1 (en) 2009-07-29 2011-02-10 Siemens Aktiengesellschaft End fitting i.e. aluminum cast part, for surge arrester utilized in high voltage network, has screw thread for axially supporting hollow threaded bolt by axial hole, where threaded bolt comprises radial holes in radial direction
DE102010043655B4 (en) * 2010-11-09 2012-08-30 Siemens Aktiengesellschaft Surge arrester with elastic cuff
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DE102015007933B4 (en) 2015-06-19 2017-06-22 Tridelta Überspannungsableiter Gmbh Surge arrester, method for producing a surge arrester
US10304598B1 (en) * 2018-01-19 2019-05-28 Te Connectivity Corporation Surge arresters and related assemblies and methods
CN110211755A (en) * 2019-05-31 2019-09-06 国网湖南省电力有限公司 Cage lightning arrester insulating cylinder and explosion-proof lightning arrester
US11295879B2 (en) 2020-07-24 2022-04-05 TE Connectivity Services Gmbh Surge arresters and related assemblies and methods
CN115036087B (en) * 2022-06-23 2024-06-25 山东泰开电力电器有限公司 Mounting structure of lightning arrester core body and laser positioning-based assembly method thereof

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DE102011078210A1 (en) 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Surge arresters
DE102011078207A1 (en) 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Surge arresters
WO2013000781A1 (en) 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Surge arrester
US9318892B2 (en) 2011-06-28 2016-04-19 Siemens Aktiengesellschaft Surge arrester
WO2013167440A1 (en) 2012-05-11 2013-11-14 Siemens Aktiengesellschaft Overvoltage arrester with cover and water drain gutter
DE102012207928A1 (en) 2012-05-11 2013-11-14 Siemens Aktiengesellschaft Surge arresters
DE102012207914A1 (en) 2012-05-11 2013-11-14 Siemens Aktiengesellschaft Surge arresters
WO2013167445A1 (en) 2012-05-11 2013-11-14 Siemens Aktiengesellschaft Surge arrester
EP3232448A1 (en) 2016-04-13 2017-10-18 Siemens Aktiengesellschaft Surge arrester
DE102016206176A1 (en) 2016-04-13 2017-10-19 Siemens Aktiengesellschaft Surge arresters
US10043603B2 (en) 2016-04-13 2018-08-07 Siemens Aktiengesellschaft Surge arrester
WO2018065034A1 (en) 2016-10-04 2018-04-12 Siemens Aktiengesellschaft Overvoltage arrester assembly and method for setting same

Also Published As

Publication number Publication date
ZA200805315B (en) 2009-10-28
KR20080080204A (en) 2008-09-02
WO2007085338A1 (en) 2007-08-02
EP1977434A1 (en) 2008-10-08
RU2378727C1 (en) 2010-01-10
CN101336459B (en) 2011-08-03
BRPI0621242A2 (en) 2011-12-06
MX2008009191A (en) 2008-10-17
DE102006003579B4 (en) 2007-10-25
KR101008134B1 (en) 2011-01-13
AR059152A1 (en) 2008-03-12
US20090046408A1 (en) 2009-02-19
HK1126310A1 (en) 2009-08-28
DE202006020436U1 (en) 2008-07-10
CN101336459A (en) 2008-12-31
JP4865816B2 (en) 2012-02-01
DE102006003579A1 (en) 2007-09-06
DE502006004414D1 (en) 2009-09-10
JP2009524262A (en) 2009-06-25
ATE438186T1 (en) 2009-08-15
AU2006336899B2 (en) 2013-03-07
US8009402B2 (en) 2011-08-30
AU2006336899A1 (en) 2007-08-02

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