EP0545038B1 - Surge arrester - Google Patents

Surge arrester Download PDF

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Publication number
EP0545038B1
EP0545038B1 EP92117361A EP92117361A EP0545038B1 EP 0545038 B1 EP0545038 B1 EP 0545038B1 EP 92117361 A EP92117361 A EP 92117361A EP 92117361 A EP92117361 A EP 92117361A EP 0545038 B1 EP0545038 B1 EP 0545038B1
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EP
European Patent Office
Prior art keywords
connecting fittings
surge voltage
voltage arrester
pellet
arrester according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92117361A
Other languages
German (de)
French (fr)
Other versions
EP0545038A1 (en
Inventor
Klaus Giese
Walter Nydegger
Walter Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Asea Brown Boveri Ltd
ABB AB
Original Assignee
ABB Asea Brown Boveri Ltd
Asea Brown Boveri AB
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Application filed by ABB Asea Brown Boveri Ltd, Asea Brown Boveri AB filed Critical ABB Asea Brown Boveri Ltd
Publication of EP0545038A1 publication Critical patent/EP0545038A1/en
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Publication of EP0545038B1 publication Critical patent/EP0545038B1/en
Anticipated expiration legal-status Critical
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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

Definitions

  • the invention is based on a surge arrester according to the preamble of claim 1.
  • a surge arrester is known with two fittings braced against one another by an insulating rod.
  • the insulating rod penetrates cylindrical varistor elements which are layered into a stack in the center thereof.
  • the fittings limit the stack of varistor elements.
  • the arrangement described is encapsulated with insulating material, insulating material also being introduced into the area around the insulating rod in the interior of the stack.
  • a surge arrester is known from WO-A-9117554, in which the two fittings are braced by three isolating rods, the isolating rods being arranged symmetrically to the longitudinal axis of the surge arrester.
  • the invention seeks to remedy this.
  • the invention as characterized in the independent claim, solves the problem of creating a surge arrester that can be created with simple means and that is also easy to cast.
  • the grooved washers ensure that a large number of contact points are formed for a perfect current transfer. The more clearly defined contact points arise, the better the current carrying capacity of a current transition. In addition, these soft washers advantageously compensate for any unevenness in the pill surface, so that these unevenness cannot reduce the current carrying capacity. It proves to be particularly advantageous that the grooved washers also seal the current transition zones of the surge arrester against the penetration of insulating material during the casting process.
  • the surge arrester has two metal connection fittings 1, 2.
  • the connection fitting 1 is provided with a fastening option (not shown) for an electrical conductor.
  • a threaded bore 3 is provided in the center, in which a pressure screw 4 is arranged.
  • the two connection fittings 1, 2 are connected to one another by two rigid, but somewhat stretchable in the axial direction, glass fiber reinforced plastic strips 5. These plastic strips 5 are fastened to the connection fittings 1, 2 by means of screws 6.
  • the plastic strips 5 have a rectangular cross section and are arranged symmetrically to the longitudinal axis of the surge arrester. As can be seen from FIGS.
  • connection fittings 1, 2 here have rectangular cross sections, but it is also possible to provide other cross sections, such as cylindrical ones.
  • the rectangular cross section of the connection fittings 1, 2 was chosen to save material and weight.
  • the frame formed by the connection fittings 1, 2 and the plastic strips 5 encloses pills 7 made of varistor material, such as ZnO.
  • the pills 7 are cylindrical.
  • a suitable plate 8 made of metal is inserted into a recess in the connection fitting 1. Between the plate 8 and the next pill 7, a cylindrically shaped grooved disk 9 is inserted, which has a central bore 10, as well as between adjacent pills 7.
  • the pressure screw 4 acts on the pressure plate 11 and guides the current from the pressure plate 11 to the connection fitting 2.
  • the arrangement thus finished is placed in a mold and cast without a gap or voids with a jacket 13 made of electrically insulating plastic.
  • a suitable plastic here is, for example, silicone rubber.
  • insulating screens 14 are formed at the same time. The entire arrangement is surrounded by the jacket 13, only the parts of the connection fittings 1, 2 that are required for electrical connections remain shiny metallic.
  • Fig. 1 three section lines are entered, section A-A in Fig. 2, section B-B in Fig. 3 and section C-C in Fig. 4 being shown.
  • 5 shows the pulley 9, which has a central bore 10.
  • a plurality of grooves 15 concentrically surround this bore 10.
  • the pulley 9 is made of soft annealed aluminum.
  • 10 shows an enlarged section through this grooved disk 9.
  • the outermost edges 16, 17 of the outermost grooves 15 also serve as a sealing edge against plastic that penetrates during potting.
  • a large number of groove shapes is conceivable, however, a sufficient sealing edge must always be formed, and it must also be ensured that a sufficient number of contact points can be formed when installing the groove washers 9.
  • plastic tapes or bundles of plastic fibers are used, if no high demands are placed on the resistance to breakage of the surge arrester. It is also possible to provide cross sections of the plastic strips 5 other than rectangular.
  • the contact force that is exerted on the arrangement by the pressure screw 4 ensures that the edges 16, 17 of the grooved disks 9 deform locally, as a result of which defined point-like contacts are created which allow particularly good current transfer.
  • the best current transfer is achieved when there are a large number of such point contacts, which are evenly distributed over an area.
  • the grooved washers 9 ensure this multitude of point contacts. This ensures that the comparatively very high current flowing when the surge arrester responds is always safely discharged through the active part of the surge arrester without a partial overloading of current transitions and the associated braising, which causes defects, can occur.
  • the operational safety of the arrester is significantly increased in this way.
  • the monolithic block to which the finished surge arrester is designed has high mechanical stability, in particular also with regard to the high resistance to breakage, and it is also insensitive to climatic influences, so that it can be used advantageously in all climatic zones.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Gas-Insulated Switchgears (AREA)

Abstract

This surge voltage arrester has two connecting fittings (1, 2) which are braced with respect to one another. At least one pellet (7) consisting of varistor material is clamped in between the connecting fittings (1, 2). It is intended to create a surge voltage arrester which can be produced using simple means and which, in addition, can be cast around in a simple manner. This is achieved in that at least two insulating clamping elements, which are arranged symmetrically, are provided for bracing the connecting fittings (1, 2). The clamping elements, the at least one pellet (7) and, partially, the connecting fittings (1, 2) have insulating plastic material cast around them to form a monolithic block.

Description

Die Erfindung geht aus von einem Ueberspannungsableiter gemäss dem Oberbegriff des Anspruchs 1.The invention is based on a surge arrester according to the preamble of claim 1.

STAND DER TECHNIKSTATE OF THE ART

Aus der EP-A1-0281 945 ist ein Ueberspannungsableiter bekannt mit zwei durch eine Isolierstange gegeneinander verspannten Armaturen. Die Isolierstange durchdringt zylinderförmig ausgebildete, zu einem Stapel geschichtete Varistorelemente in deren Zentrum. Die Armaturen begrenzen den Stapel von Varistorelementen. Die beschriebene Anordung wird mit Isoliermaterial umgossen, wobei auch in den Bereich um die Isolierstange im Innern des Stappels Isoliermaterial eingebracht wird.From EP-A1-0281 945 a surge arrester is known with two fittings braced against one another by an insulating rod. The insulating rod penetrates cylindrical varistor elements which are layered into a stack in the center thereof. The fittings limit the stack of varistor elements. The arrangement described is encapsulated with insulating material, insulating material also being introduced into the area around the insulating rod in the interior of the stack.

Aus der WO-A-9117554 ist ein Überspannungsableiter bekannt, bei dem die zwei Armaturen durch drei Isolierstangen verspannt sind, wobei die Isolierstangensymmetrisch zur längsachse des Überspannungsableiters angeordnet sind.A surge arrester is known from WO-A-9117554, in which the two fittings are braced by three isolating rods, the isolating rods being arranged symmetrically to the longitudinal axis of the surge arrester.

Die Herstellung eines derartigen Ueberspannungsableiters bedingt eine Anzahl Arbeitsschritte. Insbesondere dürfte das Umgiessen der Isolierstange ein besonderes Wissen erfordern.The production of such a surge arrester requires a number of work steps. In particular, casting the insulating rod around requires special knowledge.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie im unabhängigen Anspruch gekennzeichnet ist, löst die Aufgabe, einen Ueberspannungsableiter zu schaffen, der mit einfachen Mitteln zu erstellen ist und der zudem einfach zu umgiessen ist.The invention seeks to remedy this. The invention, as characterized in the independent claim, solves the problem of creating a surge arrester that can be created with simple means and that is also easy to cast.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass die Montage des Ueberspannungsableiters wesentlich vereinfacht wird. Beim Zusammensetzen der Aktivteile des Ueberspannungsableiters ist nur eine einfache Schablone nötig, da die axiale Führung der beiden Anschlussarmaturen durch die formschlüssig verbundenen Kunststoffleisten bereits gewährleistet ist. Diese formschlüssige Verbindung stellt zudem sicher, dass der fertige Ableiter eine grosse Widerstandsfähigkeit gegen ein Umknicken aufweist. Ferner ist es vorteilhaft, dass die ausserhalb der Pillen liegenden Kunststoffleisten beim Giessvorgang problemlos mit eingegossen werden können.The advantages achieved by the invention are essentially to be seen in the fact that the installation of the surge arrester is considerably simplified. When assembling the active parts of the surge arrester, only a simple template is necessary, since the axial guidance of the two connection fittings is already guaranteed by the positively connected plastic strips. This form-fitting connection also ensures that the finished arrester is extremely resistant to bending. Furthermore, it is advantageous that the plastic strips lying outside the pills can be easily cast in during the casting process.

Die Rillenscheiben stellen sicher, dass eine Vielzahl von Kontaktpunkten für einen einwandfreien Stromübergang gebildet wird. Je mehr eindeutig definierte Kontaktpunkte entstehen, desto besser ist die Stromtragfähigkeit eines Stromüberganges. Zudem gleichen diese weichen Rillenscheiben etwaige Unebenheiten der Pillenoberfläche vorteilhaft aus, sodass diese Unebenheiten die Stromtragfähigkeit nicht reduzieren können. Als besonders vorteilhaft erweist es sich, dass die Rillenscheiben gleichzeitig auch die Stromübergangzonen des Ueberspannungsableiters gegen das Eindringen von Isolierstoff beim Giessvorgang abdichten.The grooved washers ensure that a large number of contact points are formed for a perfect current transfer. The more clearly defined contact points arise, the better the current carrying capacity of a current transition. In addition, these soft washers advantageously compensate for any unevenness in the pill surface, so that these unevenness cannot reduce the current carrying capacity. It proves to be particularly advantageous that the grooved washers also seal the current transition zones of the surge arrester against the penetration of insulating material during the casting process.

Die weiteren Ausgestaltungen der Erfindung sind Gegenstände der abhängigen Ansprüche.The further developments of the invention are the subject of the dependent claims.

Die Erfindung, ihre Weiterbildung und die damit erzielbaren Vorteile werden nachstehend anhand der Zeichnung, welche lediglich einen möglichen Ausführungsweg darstellt, näher erläutert.The invention, its further development and the advantages which can be achieved therewith are explained in more detail below with reference to the drawing, which represents only one possible embodiment.

KURZE BESCHREIBUNG DER ZEICHNUNGBRIEF DESCRIPTION OF THE DRAWING

Es zeigen:

Fig. 1
einen Schnitt durch eine erste Ausführungsform der Erfindung
Fig. 2 bis 4
zeigen weitere Schnitte durch diese erste Ausführungsform der Erfindung,
Fig. 5
zeigt eine Ansicht einer Rillenscheibe, und
Fig. 6
zeigt einen vergrösserten Schritt durch eine Rillenscheibe gemäss Fig. 5.
Show it:
Fig. 1
a section through a first embodiment of the invention
2 to 4
show further sections through this first embodiment of the invention,
Fig. 5
shows a view of a pulley, and
Fig. 6
shows an enlarged step through a pulley according to FIG. 5.

Bei allen Figuren sind gleich wirkende Elemente mit gleichen Bezugszeichen versehen.Elements with the same effect are provided with the same reference symbols in all the figures.

WEGE ZUR AUSFÜHRUNG DER ERFINDUNGWAYS OF CARRYING OUT THE INVENTION

Die Fig. 1 zeigt in schematischer Darstellung einen Längsschnitt durch einen erfindungsgemässen Ueberspannungsableiter. Der Ueberspannungsableiter weist zwei Anschlussarmaturen 1, 2 aus Metall auf. Die Anschlussarmatur 1 ist mit einer nicht dargestellten Befestigungsmöglichkeit für einen elektrischen Leiter versehen. In der Anschlussarmatur 2 ist im Zentrum eine Gewindebohrung 3 vorgesehen, in welcher eine Druckschraube 4 angeordnet ist. Die beiden Anschlussarmaturen 1, 2 sind durch zwei starre, jedoch in axialer Richtung etwas dehnbare, glasfaserverstärkte Kunststoffleisten 5 miteinander verbunden. Diese Kunststoffleisten 5 sind mittels Schrauben 6 an den Anschlussarmaturen 1, 2 befestigt. Die Kunststoffleisten 5 weisen einen rechteckigen Querschnitt auf und sind symmetrisch zur Längsachse des Ueberspannungsableiters angeordnet. Wie aus Fig. 2 und Fig. 4 ersichtlich, sind die rechteckigen Kunststoffleisten 5 formschlüssig in die Oberfläche der jeweilige Anschlussarmatur 1 oder 2 eingebettet. Durch dieses Einbetten wird eine besonders grosse Knickfestigkeit der Anordnung erreicht und ferner eine Montageerleichterung, da durch diese gute Führung ein Ausrichten dieser Anordnung bei der Montage unnötig ist. Die Anschlussarmaturen 1, 2 weisen hier rechteckige Querschnitte auf, es ist jedoch auch möglich, andere Querschnitte vorzusehen, wie z.B. zylindrische. Der rechteckige Querschnitt der Anschlussarmaturen 1, 2 wurde aus Gründen der Material- und Gewichteinsparung gewählt.1 shows a schematic representation of a longitudinal section through a surge arrester according to the invention. The surge arrester has two metal connection fittings 1, 2. The connection fitting 1 is provided with a fastening option (not shown) for an electrical conductor. In the connection fitting 2, a threaded bore 3 is provided in the center, in which a pressure screw 4 is arranged. The two connection fittings 1, 2 are connected to one another by two rigid, but somewhat stretchable in the axial direction, glass fiber reinforced plastic strips 5. These plastic strips 5 are fastened to the connection fittings 1, 2 by means of screws 6. The plastic strips 5 have a rectangular cross section and are arranged symmetrically to the longitudinal axis of the surge arrester. As can be seen from FIGS. 2 and 4, the rectangular plastic strips 5 are embedded in a form-fitting manner in the surface of the respective connection fitting 1 or 2. This embedding creates a particularly high resistance to buckling reached the arrangement and also facilitates assembly, since this good guidance aligning this arrangement is unnecessary during assembly. The connection fittings 1, 2 here have rectangular cross sections, but it is also possible to provide other cross sections, such as cylindrical ones. The rectangular cross section of the connection fittings 1, 2 was chosen to save material and weight.

Der durch die Anschlussarmaturen 1, 2 und die Kunststoffleisten 5 gebildete Rahmen umschliesst Pillen 7 aus Varistormaterial, wie beispielsweise ZnO. Die Pillen 7 sind zylindrisch ausgebilet. In einer Aussparung der Anschlussarmatur 1 ist eine passende Platte 8 aus Metall eingelegt. Zwischen der Platte 8 und der nächsten Pille 7 ist eine zylindrisch ausgebildete Rillenscheibe 9 eingelegt, die eine zentrale Bohrung 10 aufweist, ebenso zwischen benachbarten Pillen 7. Nach der untersten Pille 7 ist ebenfalls eine Rillenscheibe 9 vorgesehen, die auf einer Druckplatte 11 aufliegt. Die Druckschraube 4 wirkt auf die Druckplatte 11 ein und führt den Strom von der Druckplatte 11 zur Anschlussarmatur 2. Beim Einbringen der beschriebenen Teile in den Rahmen ist darauf zu achten, dass keine Spalten zwischen den Teilen offenbleiben, in welche beim Vergiessen Isolierstoff eindringen könnte. Die eigentliche Kontaktkraft zwischen den Aktivteilen wird durch die Druckschraube 4 erzeugt, die mit einem vorgegebenen Drehmoment angezogen und anschliessend auf eine der bekannten Arten gesichert wird. Die so fertiggestellte Anordnung wird in eine Form eingelegt und spalt- und lunkerfrei mit einem Mantel 13 aus elektrisch isolierendem Kunststoff umgossen. Als geeigneter Kunststoff bietet sich hier beispielsweise Silikonkautschuk an. Beim Umgiessen werden gleichzeitig isolierende Schirme 14 angeformt. Die gesamte Anordnung wird mit dem Mantel 13 umgeben, lediglich die Teile der Anschlussarmaturen 1,2, die für elektrische Anschlüsse benötigt werden bleiben metallisch blank.The frame formed by the connection fittings 1, 2 and the plastic strips 5 encloses pills 7 made of varistor material, such as ZnO. The pills 7 are cylindrical. A suitable plate 8 made of metal is inserted into a recess in the connection fitting 1. Between the plate 8 and the next pill 7, a cylindrically shaped grooved disk 9 is inserted, which has a central bore 10, as well as between adjacent pills 7. The pressure screw 4 acts on the pressure plate 11 and guides the current from the pressure plate 11 to the connection fitting 2. When introducing the described parts into the frame, it must be ensured that no gaps remain between the parts, into which insulating material could penetrate during casting. The actual contact force between the active parts is generated by the pressure screw 4, which is tightened with a predetermined torque and then secured in one of the known ways. The arrangement thus finished is placed in a mold and cast without a gap or voids with a jacket 13 made of electrically insulating plastic. A suitable plastic here is, for example, silicone rubber. When casting, insulating screens 14 are formed at the same time. The entire arrangement is surrounded by the jacket 13, only the parts of the connection fittings 1, 2 that are required for electrical connections remain shiny metallic.

In Fig. 1 sind drei Schnittlinien eingetragen, wobei der Schnitt A-A in Fig. 2, der Schnitt B-B in Fig. 3 und der Schnitt C-C in Fig. 4 dargestellt ist. Fig. 5 zeigt die Rillenscheibe 9, die eine zentrale Bohrung 10 aufweist. Eine Vielzahl von Rillen 15 umgibt diese Bohrung 10 konzentrisch. Die Rillenscheibe 9 ist aus weichgeglühtem Aluminium hergestellt. Fig. 10 zeigt einen vergrösserten Schnitt durch diese Rillenscheibe 9. Jeweils die äusserste Kante 16, 17 der äussersten Rillen 15 dient zudem als Dichtkante gegen beim Vergiessen eindringenden Kunststoff. Eine Vielzahl von Rillenformen ist vorstellbar, jedoch muss stets eine hinreichende Dichtkante gebildet werden, und zudem muss sichergestellt sein, dass sich eine genügende Anzahl von Kontaktpunkten ausbilden kann bei der Montage der Rillenscheiben 9.In Fig. 1 three section lines are entered, section A-A in Fig. 2, section B-B in Fig. 3 and section C-C in Fig. 4 being shown. 5 shows the pulley 9, which has a central bore 10. A plurality of grooves 15 concentrically surround this bore 10. The pulley 9 is made of soft annealed aluminum. 10 shows an enlarged section through this grooved disk 9. The outermost edges 16, 17 of the outermost grooves 15 also serve as a sealing edge against plastic that penetrates during potting. A large number of groove shapes is conceivable, however, a sufficient sealing edge must always be formed, and it must also be ensured that a sufficient number of contact points can be formed when installing the groove washers 9.

Es ist auch vorstellbar, dass statt der starren Kunststoffleisten 5 etwa Kunststoffbänder oder Bündel von Kunststofffasern eingesetzt werden, wenn an die Umbruchfestigkeit des Ueberspannungsableiters keine hohen Anforderungen gestellt werden. Es ist auch möglich, andere als rechteckige Querschnitte der Kunststoffleisten 5 vorzusehen.It is also conceivable that, instead of the rigid plastic strips 5, plastic tapes or bundles of plastic fibers are used, if no high demands are placed on the resistance to breakage of the surge arrester. It is also possible to provide cross sections of the plastic strips 5 other than rectangular.

Zur Erläuterung der Wirkungsweise werden die beschriebenen Figuren etwas näher betrachtet. Die Kontaktkraft, die durch die Druckschraube 4 auf die Anordnung aufgebracht wird, stellt sicher, dass sich die Kanten 16, 17 der Rillenscheiben 9 örtlich deformieren, wodurch definierte punktförmige Kontakte entstehen, die einen besonders guten Stromübergang erlauben. Der beste Stromübergang wird erreicht, wenn eine Vielzahl derartiger punktförmiger Kontakte, die gleichmässig über eine Fläche verteilt sind, vorliegt. Die Rillenscheiben 9 stellen diese Vielzahl von punktförmigen Kontakten sicher. Auf diese Art und Weise ist sichergestellt, dass der bei einem Ansprechen des Ueberspannungsableiters fliessende, vergleichsweise sehr hohe Strom, stets sicher durch den Aktivteil des Ueberspannungsableiters abgeführt wird, ohne dass eine stellenweise Ueberlastung von Stromübergängen und ein damit verbundenes Schmoren, welches Defekte verursacht, auftreten kann. Die Betriebssicherheit des Ableiters wird auf diese Weise deutlich erhöht.To explain the mode of operation, the figures described are considered in more detail. The contact force that is exerted on the arrangement by the pressure screw 4 ensures that the edges 16, 17 of the grooved disks 9 deform locally, as a result of which defined point-like contacts are created which allow particularly good current transfer. The best current transfer is achieved when there are a large number of such point contacts, which are evenly distributed over an area. The grooved washers 9 ensure this multitude of point contacts. This ensures that the comparatively very high current flowing when the surge arrester responds is always safely discharged through the active part of the surge arrester without a partial overloading of current transitions and the associated braising, which causes defects, can occur. The operational safety of the arrester is significantly increased in this way.

Ferner dient es der Betriebssicherheit, dass die erwähnte Kontaktkraft über die gesamte Lebensdauer des Ueberspannungsableiters aufrecht erhalten wird, da die Kunststoffleisten 5 auch als Federelemente wirken, die sich beim Anziehen der Druckschraube 4 etwas dehnen und die diese Vorspannung aufrecht erhalten. Diese Vorspannung wird so gewählt, dass auch ein etwaiges Schwinden der Rillenscheiben 9 stets und sicher ausgeglichen werden kann.Furthermore, it serves the operational safety that the mentioned contact force is maintained over the entire life span of the surge arrester, since the plastic strips 5 also act as spring elements which stretch somewhat when the pressure screw 4 is tightened and which maintain this pretension. This preload is selected so that any shrinkage of the pulleys 9 can always and reliably be compensated for.

Durch das Eingiessen der gesamten Anordnung in den Mantel 13 wird vorteilhaft sichergestellt, dass sowohl die Pillen 7 als auch die Kunststoffleisten 5 keine Feuchtigkeit aus der Umgebungsluft aufnehmen können, sodass deren Spannungsfestigkeit nicht reduziert wird. Der monolithische Block zu dem der fertige Ueberspannungsableiter ausgebildet ist, weist eine hohe mechanische Stabilität auf, insbesondere auch im Hinblick auf die hohe Umbruchfestigkeit, und zudem ist er unempfindlich gegen Klimaeinflüsse, sodass er vorteilhaft in allen Klimazonen eingesetzt werden kann.Pouring the entire arrangement into the jacket 13 advantageously ensures that both the pills 7 and the plastic strips 5 cannot absorb moisture from the ambient air, so that their dielectric strength is not reduced. The monolithic block to which the finished surge arrester is designed has high mechanical stability, in particular also with regard to the high resistance to breakage, and it is also insensitive to climatic influences, so that it can be used advantageously in all climatic zones.

Claims (7)

  1. Surge voltage arrester having two connecting fittings (1, 2) which are braced with respect to one another, and having at least one pellet (7) which is clamped in between the connecting fittings (1, 2) and consists of varistor material, in which at least two insulating clamping elements, which are arranged symmetrically adjacent to the at least one pellet (7), are provided for bracing the connecting fittings (1, 2), and in which the at least two clamping elements, the at least one pellet (7) and, partially, the connecting fittings (1, 2) have insulating plastic material cast around them to form a monolithic block, characterized in that
    - rigid plastic strips (5) which can expand somewhat in the axial direction are provided as clamping elements, and
    - these rigid plastic strips (5) are embedded in a positively locking manner at their end in each of the connecting fittings (1, 2), and are connected thereto.
  2. Surge voltage arrester according to Claim 1, characterized in that
    - strips of glass fibre reinforced epoxy resin are provided as the rigid plastic strips (5).
  3. Surge voltage arrester according to one of Claims 1 or 2, characterized in that
    - a pressure screw (4) is provided in order to produce faultless current transfer points between the connecting fittings (1, 2) and the at least one pellet (7).
  4. Surge voltage arrester according to one of Claims 1 to 3, characterized in that
    - in each case one metallic grooved disc (9) ensures current transfer at every current transfer point between the at least one pellet (7) and the connecting fittings (1, 2), and
    - in each case one metallic grooved disc (9) ensures current -transfer between adjacent pellets (7).
  5. Surge voltage arrester according to Claim 4, characterized in that
    - the metallic grooved disc (9) has an external contour matched to the pellets (7), and
    - the metal of the grooved disc (9) is annealed.
  6. Surge voltage arrester according to Claim 5, characterized in that
    - both the pellets (7) and the grooved discs (9) are of cylindrical construction.
  7. Surge voltage arrester according to one of Claims 4 to 6, characterized in that
    - the grooved disc (9) is manufactured from aluminium.
EP92117361A 1991-12-04 1992-10-10 Surge arrester Expired - Lifetime EP0545038B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3558/91 1991-12-04
CH3558/91A CH682858A5 (en) 1991-12-04 1991-12-04 Surge arresters.

Publications (2)

Publication Number Publication Date
EP0545038A1 EP0545038A1 (en) 1993-06-09
EP0545038B1 true EP0545038B1 (en) 1995-05-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92117361A Expired - Lifetime EP0545038B1 (en) 1991-12-04 1992-10-10 Surge arrester

Country Status (11)

Country Link
US (1) US5291366A (en)
EP (1) EP0545038B1 (en)
AT (1) ATE122496T1 (en)
AU (1) AU655083B2 (en)
CA (1) CA2081442C (en)
CH (1) CH682858A5 (en)
CZ (1) CZ280827B6 (en)
DE (1) DE59202147D1 (en)
ES (1) ES2074319T3 (en)
HU (1) HU215656B (en)
PL (1) PL171837B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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HU215656B (en) 1999-02-01
AU655083B2 (en) 1994-12-01
AU2811692A (en) 1993-06-10
PL296750A1 (en) 1993-06-14
DE59202147D1 (en) 1995-06-14
CZ355592A3 (en) 1993-06-16
ATE122496T1 (en) 1995-05-15
ES2074319T3 (en) 1995-09-01
PL171837B1 (en) 1997-06-30
CH682858A5 (en) 1993-11-30
CZ280827B6 (en) 1996-04-17
HUT63013A (en) 1993-06-28
HU9203825D0 (en) 1993-03-29
EP0545038A1 (en) 1993-06-09
CA2081442C (en) 2001-12-11
US5291366A (en) 1994-03-01
CA2081442A1 (en) 1993-06-05

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