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EP2702597B1 - Surge arrestor - Google Patents

Surge arrestor Download PDF

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Publication number
EP2702597B1
EP2702597B1 EP12729020.3A EP12729020A EP2702597B1 EP 2702597 B1 EP2702597 B1 EP 2702597B1 EP 12729020 A EP12729020 A EP 12729020A EP 2702597 B1 EP2702597 B1 EP 2702597B1
Authority
EP
European Patent Office
Prior art keywords
surge arrester
housing
control cover
dissipation element
contacts
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.)
Active
Application number
EP12729020.3A
Other languages
German (de)
French (fr)
Other versions
EP2702597A1 (en
Inventor
Dirk Springborn
Erhard Pippert
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.)
Siemens AG
Original Assignee
Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP2702597A1 publication Critical patent/EP2702597A1/en
Application granted granted Critical
Publication of EP2702597B1 publication Critical patent/EP2702597B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/40—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing
    • H01H2003/405—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing using a walking nut
    • 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
    • H01T1/16—Series resistor structurally associated with spark gap
    • 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
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/06—Adjustment of spark gaps
    • 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
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/04—Housings

Definitions

  • the invention relates to a surge arrester according to the preamble of patent claim 1.
  • Surge arresters are protective systems, for example, for switchgear, which in the event of overvoltages caused by lightning strikes or malfunctions of other subsystems dissipate these overvoltages to ground and thus protect other components of the switchgear.
  • Such a surge arrester comprises one or more cylindrical diverting elements, which have a varistor column made up of individual, likewise cylindrical varistor elements.
  • Varistor elements are characterized by a voltage-dependent resistance. At low voltages these act as insulators. From a certain threshold voltage, which is material-dependent, they show a good conductivity.
  • varistor elements are made of metal oxides such as zinc oxide.
  • the diverter is limited at both ends by end fittings that make electrical contact with the switchgear and ground. To ensure a good electrical contact even under mechanical stress, the varistor column must be held together under pressure. This can be done by tension members, for example, ropes or rods are preferably clamped in glass fiber reinforced plastic in the end fittings under train. The tension elements surround the varistor column and thus form a cage around them.
  • surge arresters For use in gas-insulated switchgear surge arresters have a fluid-tight housing, which surrounds the discharge element.
  • the housing is to increase the dielectric strength with a fluid, usually sulfur hexafluoride, filled.
  • the housing is usually made of metal and is electrically grounded.
  • An end fitting of the delivery column is grounded via a contact made through the housing.
  • the other end fitting is electrically connected via a passage with a contact located on the outside of the housing, which serves to connect to the switchgear.
  • larger surge arresters often have at their high voltage end of a control hood, which is slipped over the end of the Ableit yarn as unilaterally closed cylinder.
  • the individual varistor elements have a high capacitance with respect to ground potential, but their series connection leads to a very small longitudinal capacitance, which leads to an inhomogeneous voltage distribution as of a certain length of the varistor column.
  • the varistor elements are therefore subject to higher voltages, which together with their resistive effect can lead to undesired heating.
  • the control hood now serves to homogenize the stress distribution along the length of the varistor column.
  • the surge arrester must be disconnected from the switchgear because of the high voltages which then occur. Otherwise, the surge arrester would divert the voltage to ground and the measurement result would be corrupted.
  • the invention has for its object to provide a surge arrester of the type mentioned, a structurally easier manufacture or interrupting the electrical connection.
  • the invention provides a surge arrester, with a discharge element, a control hood electrically connected to the discharge element and a fluid-tight housing in which the discharge element and the control hood are arranged and which has two in each case the interior with the outside of the housing electrically connecting contacts.
  • the diverting element and the control hood are designed to be movable relative to one another, wherein an electrical connection of one of the contacts via the diverting element to the other of the contacts can be produced or interrupted by the relative movement. Due to the relative movement of the control hood and the diverter element, an electrical connection to the switchgear can be established or interrupted in a particularly simple manner. For example, control hood and diverting element can be moved together in approximately different directions. Alternatively, the control hood can sit firmly and only the diverting be moved. In any case, the moving mass is lower than in the prior art, so that the mechanical elements required for the movement can be made structurally simpler.
  • the discharge element is arranged along a longitudinal axis of the housing and the control hood in Slidably disposed in the direction of this longitudinal axis. This results in a particularly compact arrangement.
  • the displaceability of the control hood along the longitudinal axis allows the best possible use of space and compliance with the required isolation distances producing and closing an electrical connection to the switchgear.
  • control hood is displaceable by means of a displaceable from outside the fluid-tight housing displacement device.
  • the surge arrester according to the invention can be configured in that the displacement device has a shaft which can be actuated by rotational movement, a push rod connected to the control hood and a transmission which translates the rotational movement of the shaft into a translational movement of the push rod.
  • the displacement device has a shaft which can be actuated by rotational movement, a push rod connected to the control hood and a transmission which translates the rotational movement of the shaft into a translational movement of the push rod.
  • the push rod is at least partially made of electrically insulating material.
  • This can be for example a glass fiber reinforced plastic. This advantageously ensures the insulation resistance, since voltage flashovers between the push rod and the housing are avoided.
  • a further embodiment of the surge arrester according to the invention provides that the shaft fluid-tight from the Inner is guided to the outside of the housing. This advantageously prevents the escape of fluid from the housing. Harmful environmental influences by the fluid are thus avoided. In addition, the dielectric strength is retained and the surge arrester thus requires little maintenance.
  • an advantageous embodiment of the invention provides that one end of the discharge element with one of the contacts and the other end of the discharge element are electrically connected to the control hood and that by the displacement of the control hood the electrical connection to the other of the contacts can be produced or interrupted. This allows to make and break the connection only to move the control hood. This is relative to the diverter relatively easy. A movement of the control hood therefore requires less mechanical effort.
  • control hood and the other of the contacts engage in a form-fitting manner with the electrical connection produced in such a way that they are radially fixed with respect to the longitudinal axis.
  • This has the effect that the control hood and contact center against each other at the contact closure and can not tilt.
  • This can lead to the largest possible contact area between the control hood and contact. This ensures a secure connection of the control hood to the high voltage potential of the contact.
  • control hood is connected to the deflecting element for displaceability in the direction of the longitudinal axis via slide bearings.
  • the sliding bearings are mounted laterally on end electrodes and guide and fix the control hood in the radial direction with respect to the longitudinal axis.
  • the control hood is also fixed radially over the contact. If, in addition, the earth-side end of the diverting element is, for example radially fixed by a fixed connection of a ground-side end electrode with the housing cover, so discharge element and control cover are fixed to each other with respect to the housing and so insensitive to vibrations, for example, during transport or earthquake.
  • FIGS. 1 and 2 show a surge arrester 1 in a sectional view.
  • a discharge element 20 is arranged in a fluid-tight housing 2, a discharge element 20 is arranged.
  • This discharge element 20 has a cylindrical varistor column 25, an upper end fitting 22, a lower end fitting 21 and a plurality of tension elements 23.
  • the varistor column 25 is composed of individual, also cylindrical Varistorblöcken.
  • end fittings 21 and 22 At the two ends of the varistor column 25 sit end fittings 21 and 22, of which in the Fig. 1 and 2 only the lower end fitting 21 is visible.
  • the end fittings 21, 22 are usually made of electrically conductive material.
  • Tension elements 23 are pressed in the end fittings 21, 22 under train and so hold the varistor column 25 together.
  • retaining disks 24 are inserted, which have holes through which the tension elements 23 are guided and thus stabilize the discharge element 20 additionally.
  • the housing 2 is substantially cylindrical.
  • the longitudinal axis 50 extends along the cylinder axis.
  • the discharge element 20 is aligned along this longitudinal axis 50.
  • the housing 2 is closed fluid-tight.
  • the top surface of the housing 2 is closed with a simple housing cover 4.
  • a contact 8 is electrically isolated through this housing cover 4 from the inside to the outside of the housing 2 and serves the ground terminal.
  • this contact 8 is electrically conductively connected to the diverting element 20, for example with a cable 15.
  • the connection is made here via a conductive connection plate 13.
  • Between this and the lower end fitting 21 is still an insulating spacer 14.
  • the connection of the cable 15 could alternatively be made directly to the lower end fitting 21, the insulating spacer 14 then deleted.
  • the end fitting 21 of the discharge element 20 is fastened to the housing cover 4.
  • the housing cover 4 is electrically insulated against the varistor column 25. The insulation takes place here through the intermediate piece 14.
  • the housing cover 4 has a connection, not illustrated here, via which fluid, for example sulfur hexafluoride, can be introduced into the housing 2 or drained off.
  • the top surface of the housing 2 is provided with a high-voltage feedthrough 5 in order to lead the electrical high-voltage potential into the housing 2 from the outside without danger of a flashover between high voltage and earthed housing 2.
  • the implementation 5 comprises a retaining ring 12, an insulator 6 and a contact 7, which is designed here as a plug contact.
  • the surge arrester 1 can be connected to a gas-insulated switchgear, not shown here.
  • the contact 7 is provided with an electrically conductive fitting 9.
  • the implementation is provided with sealing rings (10).
  • a substantially cylindrical, closed at one end control hood 40 is slipped over the high voltage end of the discharge element 20.
  • the control hood 20 is connected to a displacement device 30 which has a push rod 33, a transmission 32, which can be embodied, for example, as a trapezoidal thread drive, a shaft 31 guided fluid-tightly through the housing cover 4, and a control element 34 connected to this shaft 31 outside the housing 2 having.
  • a display device 35 can be attached to the operating element 34, which indicates whether the electrical connection is established or interrupted.
  • the shaft 31 can be set in a rotating movement. Via the gear 32, this rotational movement is converted into a linear movement of the push rod 33 in the direction of the longitudinal axis 50.
  • the push rod 33 in turn transmits this linear movement to the control hood 40.
  • the control hood 40 can thus be moved in the direction of the longitudinal axis 50 toward the contact 7 and away therefrom, thus establishing or interrupting an electrical connection. In the illustration in Fig. 1 the electrical connection is interrupted.
  • Fig. 3 shows a section of the high-voltage side end of the surge arrester 1 in a Schittdargna.
  • the electrical connection is made here.
  • the control hood 40 abuts the fitting 9 of the contact 7.
  • Control hood 40 and fitting 9 are shaped so that a bulge of the fitting 9 engages in a corresponding indentation of the closed end of the control hood 40.
  • the control hood 40 is thus fixed in the radial direction with respect to the longitudinal axis 50.
  • the end fitting 22 has plain bearings 41, which fix the control hood 40 radially with respect to the longitudinal axis 50 and thus guide the control hood 40 upon a displacement in the direction of the longitudinal axis 50.
  • the plain bearings 41 may be electrically conductive and thus simultaneously serve the electrical connection of the control hood 40 with the end fitting 22, but they can also be made of a non-conductive material, such as a plastic.
  • the electrical connection of the end fitting 22 with the control hood 40 can then be done for example via a flexible conductor strip.

Landscapes

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

Description

Die Erfindung betrifft einen Überspannungsableiter gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a surge arrester according to the preamble of patent claim 1.

Überspannungsableiter sind Schutzsysteme beispielsweise für Schaltanlagen, die bei auftretenden Überspannungen durch Blitzeinschlag oder Fehlfunktionen anderer Teilsysteme diese Überspannungen zur Masse hin ableiten und so andere Bauteile der Schaltanlage schützen.Surge arresters are protective systems, for example, for switchgear, which in the event of overvoltages caused by lightning strikes or malfunctions of other subsystems dissipate these overvoltages to ground and thus protect other components of the switchgear.

Ein derartiger Überspannungsableiter umfasst ein oder mehrere zylindrische Ableitelemente, die eine aus einzelnen ebenfalls zylindrischen Varistorelementen aufgebaute Varistorsäule aufweisen. Varistorelemente zeichnen sich durch einen spannungsabhängigen Widerstand aus. Bei niedrigen Spannungen wirken diese als Isolatoren. Ab einer bestimmten Schwellenspannung, die materialabhängig ist, zeigen sie eine gute Leitfähigkeit. Häufig werden Varistorelemente aus Metalloxiden wie Zinkoxid hergestellt. Das Ableitelement wird an beiden Enden von Endarmaturen begrenzt, die den elektrischen Kontakt zur Schaltanlage und zur Masse herstellen. Um einen guten elektrischen Kontakt auch unter mechanischer Belastung zu gewährleisten, muss die Varistorsäule unter Druck zusammengehalten werden. Dies kann erfolgen, indem Zugelemente beispielweise Seile oder Stäbe vorzugsweise aus glasfaserverstärktem Kunststoff in den Endarmaturen unter Zug eingespannt werden. Die Zugelemente umgeben dabei die Varistorsäule und bilden so einen Käfig um diese.Such a surge arrester comprises one or more cylindrical diverting elements, which have a varistor column made up of individual, likewise cylindrical varistor elements. Varistor elements are characterized by a voltage-dependent resistance. At low voltages these act as insulators. From a certain threshold voltage, which is material-dependent, they show a good conductivity. Frequently, varistor elements are made of metal oxides such as zinc oxide. The diverter is limited at both ends by end fittings that make electrical contact with the switchgear and ground. To ensure a good electrical contact even under mechanical stress, the varistor column must be held together under pressure. This can be done by tension members, for example, ropes or rods are preferably clamped in glass fiber reinforced plastic in the end fittings under train. The tension elements surround the varistor column and thus form a cage around them.

Für den Einsatz in gasisolierten Schaltanlagen weisen Überspannungsableiter ein fluiddichtes Gehäuse auf, das das Ableitelement umgibt. Das Gehäuse ist dabei zur Erhöhung der Durchschlagfestigkeit mit einem Fluid, meist Schwefelhexafluorid, gefüllt. Das Gehäuse besteht meist aus Metall und ist elektrisch geerdet. Eine Endarmatur der Ableitsäule ist über einen durch das Gehäuse geführten Kontakt geerdet. Die andere Endarmatur ist über eine Durchführung mit einem an der Außenseite des Gehäuses befindlichen Kontakt elektrisch verbunden, der dem Anschluss an die Schaltanlage dient. Insbesondere größere Überspannungsableiter besitzen häufig an ihrem hochspannungsseitigen Ende eine Steuerhaube, die als einseitig verschlossener Zylinder über das Ende der Ableitsäule gestülpt ist. Die einzelnen Varistorelemente haben gegenüber Erdpotential eine hohe Kapazität, ihre Reihenschaltung führt jedoch zu einer sehr kleinen Längskapazität, was ab einer bestimmten Baulänge der Varistorsäule zu einer inhomogenen Spannungsverteilung führt. Im weiter vom Erdpotential entfernten Teil der Varistorsäule werden die Varistorelemente daher spannungsmäßig höher beansprucht, was zusammen mit ihrer resistiven Wirkung zu einer unerwünschten Erwärmung führen kann. Die Steuerhaube dient nun dazu, die Spannungsverteilung entlang der Länge der Varistorsäule zu homogenisieren.For use in gas-insulated switchgear surge arresters have a fluid-tight housing, which surrounds the discharge element. The housing is to increase the dielectric strength with a fluid, usually sulfur hexafluoride, filled. The housing is usually made of metal and is electrically grounded. An end fitting of the delivery column is grounded via a contact made through the housing. The other end fitting is electrically connected via a passage with a contact located on the outside of the housing, which serves to connect to the switchgear. In particular, larger surge arresters often have at their high voltage end of a control hood, which is slipped over the end of the Ableitsäule as unilaterally closed cylinder. The individual varistor elements have a high capacitance with respect to ground potential, but their series connection leads to a very small longitudinal capacitance, which leads to an inhomogeneous voltage distribution as of a certain length of the varistor column. In part of the varistor column, which is further away from the ground potential, the varistor elements are therefore subject to higher voltages, which together with their resistive effect can lead to undesired heating. The control hood now serves to homogenize the stress distribution along the length of the varistor column.

Soll die Schaltanlage elektrisch getestet werden, so muss wegen der dann auftretenden hohen Spannungen der Überspannungsableiter von der Schaltanlage getrennt werden. Andernfalls würde der Überspannungsableiter die Spannung zur Erde ableiten und das Messergebnis würde verfälscht.If the switchgear is to be electrically tested, then the surge arrester must be disconnected from the switchgear because of the high voltages which then occur. Otherwise, the surge arrester would divert the voltage to ground and the measurement result would be corrupted.

Bislang sind Überspannungsableiter bekannt, die eine Trennstelle aufweisen, womit der Überspannungsableiter von der Schaltanlage getrennt werden kann. Zum Betätigen dieser Trennstelle muss das Gehäuse geöffnet werden, wodurch Schwefelhexafluorid austreten kann. Da Schwefelhexafluorid ein schädliches Treibhausgas ist, ist dies höchst unerwünscht und somit nachteilig.So far surge arresters are known which have a separation point, whereby the surge arrester can be separated from the switchgear. To actuate this separation point, the housing must be opened, whereby sulfur hexafluoride can escape. Since sulfur hexafluoride is a harmful greenhouse gas, this is highly undesirable and thus detrimental.

Aus der JP10322822-A ist ein gattungsgemäßer Überspannungsableiter bekannt, bei dem die Ableitsäule von der Schaltanlage getrennt wird, indem die Anordnung aus Ableitsäule und Steuerhaube gemeinsam bewegt wird und so eine elektrische Verbindung hergestellt oder unterbrochen wird. Zur Betätigung wird hierbei eine lineare Bewegung gasdicht durch die Gehäusewand ausgeführt.From the JP10322822-A a generic surge arrester is known in which the Ableitsäule is separated from the switchgear by the arrangement of Ableitsäule and control hood is moved together and so an electrical connection produced or interrupted. For actuation, a linear movement is carried out gas-tight through the housing wall.

Der Erfindung liegt die Aufgabe zugrunde, einen Überspannungsableiter der eingangs genannten Art bereitzustellen, der ein konstruktiv einfacheres Herstellen beziehungsweise Unterbrechen der elektrischen Verbindung.The invention has for its object to provide a surge arrester of the type mentioned, a structurally easier manufacture or interrupting the electrical connection.

Diese Aufgabe wird durch einen gattungsgemäßen Überspannungsableiter mit den im kennzeichnenden Teil des Patentanspruch 1 angegebenen Merkmalen gelöst.This object is achieved by a generic surge arrester with the features specified in the characterizing part of claim 1.

Dabei sieht die Erfindung eine Überspannungsableiter vor, mit einem Ableitelement, einer elektrisch mit dem Ableitelement verbundenen Steuerhaube und einem fluiddichten Gehäuse, in welchem das Ableitelement und die Steuerhaube angeordnet sind und welches zwei jeweils das Innere mit dem Äußeren des Gehäuses elektrisch verbindende Kontakte aufweist. Es ist dabei vorgesehen, dass das Ableitelement und die Steuerhaube relativ zueinander bewegbar ausgebildet sind, wobei durch die Relativbewegung eine elektrische Verbindung von einem der Kontakte über das Ableitelement zum anderen der Kontakte herstellbar beziehungsweise unterbrechbar ist. Durch die Relativbewegung von Steuerhaube und Ableitelement kann auf besonders einfache Weise eine elektrische Verbindung zur Schaltanlage hergestellt oder unterbrochen werden. Beispielsweise können Steuerhaube und Ableitelement gemeinsam etwa in unterschiedliche Richtungen bewegt werden. Alternativ kann auch die Steuerhaube fest sitzen und nur das Ableitelement bewegt werden. In jedem Fall ist die bewegte Masse geringer als im Stand der Technik, so dass die für die Bewegung erforderlichen mechanischen Elemente konstruktiv einfacher ausgeführt werden können.In this case, the invention provides a surge arrester, with a discharge element, a control hood electrically connected to the discharge element and a fluid-tight housing in which the discharge element and the control hood are arranged and which has two in each case the interior with the outside of the housing electrically connecting contacts. It is provided that the diverting element and the control hood are designed to be movable relative to one another, wherein an electrical connection of one of the contacts via the diverting element to the other of the contacts can be produced or interrupted by the relative movement. Due to the relative movement of the control hood and the diverter element, an electrical connection to the switchgear can be established or interrupted in a particularly simple manner. For example, control hood and diverting element can be moved together in approximately different directions. Alternatively, the control hood can sit firmly and only the diverting be moved. In any case, the moving mass is lower than in the prior art, so that the mechanical elements required for the movement can be made structurally simpler.

In einer vorteilhaften Ausgestaltung des erfindungsgemäßen Überspannungsableiters ist das Ableitelement entlang einer Längsachse des Gehäuses angeordnet und die Steuerhaube in Richtung dieser Längsachse verschiebbar angeordnet. Hierdurch ergibt sich eine besonders kompakte Anordnung. Die Verschiebbarkeit der Steuerhaube entlang der Längsachse erlaubt bei bestmöglicher Raumausnutzung und Einhaltung der erforderlichen Isolationsabstände das Herstellen und Schließen einer elektrischen Verbindung zur Schaltanlage.In an advantageous embodiment of the surge arrester according to the invention, the discharge element is arranged along a longitudinal axis of the housing and the control hood in Slidably disposed in the direction of this longitudinal axis. This results in a particularly compact arrangement. The displaceability of the control hood along the longitudinal axis allows the best possible use of space and compliance with the required isolation distances producing and closing an electrical connection to the switchgear.

In einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Überspannungsableiters ist vorgesehen, dass die Steuerhaube mittels einer von außerhalb des fluiddichten Gehäuses betätigbaren Verschiebungseinrichtung verschiebbar ist. Vorteilhaft daran ist, dass hierdurch die elektrische Verbindung des Ableitelementes zur Schaltanlage bei geschlossenem Gehäuse hergestellt und unterbrochen werden kann. Ein Öffnen des Gehäuses und ein damit verbundener Gasverlust kann so vermieden werden.In a further advantageous embodiment of the surge arrester according to the invention it is provided that the control hood is displaceable by means of a displaceable from outside the fluid-tight housing displacement device. The advantage of this is that in this way the electrical connection of the diverter element to the switchgear can be made and interrupted when the housing is closed. An opening of the housing and an associated gas loss can be avoided.

Besonders vorteilhaft kann der erfindungsgemäße Überspannungsableiter dadurch ausgestaltet werden, dass die Verschiebungseinrichtung eine durch Rotationsbewegung betätigbare Welle, eine mit der Steuerhaube verbundene Schubstange und ein die Rotationsbewegung der Welle in eine Translationsbewegung der Schubstange übersetzendes Getriebe aufweist. Eine solche Verschiebungseinrichtung lässt sich besonders kompakt bauen und erlaubt eine einfache Bedienung. Die rotierende Bewegung der in das Gehäuse hinein geführten Welle lässt sich durch einschlägige Maßnahmen leicht abdichten.Particularly advantageously, the surge arrester according to the invention can be configured in that the displacement device has a shaft which can be actuated by rotational movement, a push rod connected to the control hood and a transmission which translates the rotational movement of the shaft into a translational movement of the push rod. Such a displacement device can be built very compact and allows easy operation. The rotating movement of the guided into the housing shaft can be easily sealed by pertinent measures.

In einer anderen vorteilhaften Ausgestaltung des erfindungsgemäßen Überspannungsableiters besteht die Schubstange zumindest teilweise aus elektrisch isolierendem Material. Dies kann beispielsweise ein glasfaserverstärkter Kunststoff sein. Dadurch wird vorteilhaft die Isolationsfestigkeit gewährleistet, da Spannungsüberschläge zwischen Schubstange und Gehäuse vermieden werden.In another advantageous embodiment of the surge arrester according to the invention, the push rod is at least partially made of electrically insulating material. This can be for example a glass fiber reinforced plastic. This advantageously ensures the insulation resistance, since voltage flashovers between the push rod and the housing are avoided.

Eine weitere Ausgestaltung des erfindungsgemäßen Überspannungsableiters sieht vor, dass die Welle fluiddicht vom der Inneren zum Äußeren des Gehäuses geführt ist. Hierdurch wird vorteilhaft der Austritt von Fluid aus dem Gehäuse verhindert. Schädliche Umwelteinflüsse durch das Fluid werden so vermieden. Außerdem beleibt so die Spannungsfestigkeit erhalten und der Überspannungsableiter wird damit wartungsarm.A further embodiment of the surge arrester according to the invention provides that the shaft fluid-tight from the Inner is guided to the outside of the housing. This advantageously prevents the escape of fluid from the housing. Harmful environmental influences by the fluid are thus avoided. In addition, the dielectric strength is retained and the surge arrester thus requires little maintenance.

Des Weiteren sieht eine vorteilhafte Ausgestaltung der Erfindung vor, dass ein Ende des Ableitelementes mit einem der Kontakte und das andere Ende des Ableitelementes mit der Steuerhaube elektrisch verbunden sind und dass durch die Verschiebung der Steuerhaube die elektrische Verbindung zum anderen der Kontakte herstellbar beziehungsweise unterbrechbar ist. Dies erlaubt zum Herstellen und Unterbrechen der Verbindung nur die Steuerhaube zu bewegen. Diese ist gegenüber dem Ableitelement relativ leicht. Eine Bewegung der Steuerhaube erfordert daher einen geringeren mechanischen Aufwand.Furthermore, an advantageous embodiment of the invention provides that one end of the discharge element with one of the contacts and the other end of the discharge element are electrically connected to the control hood and that by the displacement of the control hood the electrical connection to the other of the contacts can be produced or interrupted. This allows to make and break the connection only to move the control hood. This is relative to the diverter relatively easy. A movement of the control hood therefore requires less mechanical effort.

In einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Überspannungsableiters ist vorgesehen, dass die Steuerhaube und der andere der Kontakte bei hergestellter elektrischer Verbindung derart formschlüssig ineinander greifen, dass sie bezüglich der Längsachse radial fixiert sind. Hierdurch wird bewirkt, dass sich Steuerhaube und Kontakt beim Kontaktschluss gegeneinander zentrieren und nicht verkanten können. Durch gegengleiche Formgebung von Steuerhaube und Kontakt kann hierdurch eine möglichst große Kontaktfläche zwischen Steuerhaube und Kontakt entsteht. Dadurch ist ein sicherer Anschluss der Steuerhaube an das Hochspannungspotential des Kontaktes gewährleistet.In a further advantageous embodiment of the surge arrester according to the invention, it is provided that the control hood and the other of the contacts engage in a form-fitting manner with the electrical connection produced in such a way that they are radially fixed with respect to the longitudinal axis. This has the effect that the control hood and contact center against each other at the contact closure and can not tilt. By the same shape of the control hood and contact this can lead to the largest possible contact area between the control hood and contact. This ensures a secure connection of the control hood to the high voltage potential of the contact.

Vorteilhaft kann zudem vorgesehen sein, dass die Steuerhaube zur Verschiebbarkeit in Richtung der Längsachse über Gleitlager mit dem Ableitelement verbunden ist. Vorzugsweise sind die Gleitlager seitlich an Endelektroden angebracht und führen und fixieren die Steuerhaube in radialer Richtung in Bezug auf die Längsachse. Bei hergestellter elektrischer Verbindung ist die Steuerhaube zudem über den Kontakt radial fixiert. Ist zudem das erdseitige Ende des Ableitelementes beispielsweise durch eine feste Verbindung einer erdseitigen Endelektrode mit dem Gehäusedeckel radial fixiert, so sind Ableitelement und Steuerhaube miteinander gegenüber dem Gehäuse fixiert und so unempfindlich gegen Erschütterungen, beispielsweise beim Transport oder bei Erdbeben.Advantageously, it can also be provided that the control hood is connected to the deflecting element for displaceability in the direction of the longitudinal axis via slide bearings. Preferably, the sliding bearings are mounted laterally on end electrodes and guide and fix the control hood in the radial direction with respect to the longitudinal axis. When manufactured electrical connection, the control hood is also fixed radially over the contact. If, in addition, the earth-side end of the diverting element is, for example radially fixed by a fixed connection of a ground-side end electrode with the housing cover, so discharge element and control cover are fixed to each other with respect to the housing and so insensitive to vibrations, for example, during transport or earthquake.

Im Folgenden wird die Erfindung anhand von Zeichnungen näher erläutert. Dabei zeigen:

FIG 1
ein Überspannungsableiter mit unterbrochener elektrischer Verbindung in einer Schnittdarstellung,
FIG 2
ein Überspannungsableiter mit hergestellter elektrischer Verbindung in einer Schnittdarstellung,
FIG 3
einen Ausschnitt aus Fig. 2 in einer perspektivischen Schnittdarstellung,
In the following the invention will be explained in more detail with reference to drawings. Showing:
FIG. 1
a surge arrester with interrupted electrical connection in a sectional view,
FIG. 2
a surge arrester with produced electrical connection in a sectional view,
FIG. 3
a section from Fig. 2 in a perspective sectional view,

Einander entsprechende Teile sind in allen Zeichnungen mit den gleichen Bezugszeichen versehen.Corresponding parts are provided in all drawings with the same reference numerals.

Die Figuren 1 und 2 zeigen einen Überspannungsableiter 1 in Schnittdarstellung. In einem fluiddichten Gehäuse 2 ist ein Ableitelement 20 angeordnet. Dieses Ableitelement 20 weist eine zylindrische Varistorsäule 25, eine obere Endarmatur 22, eine untere Endarmatur 21 und mehrere-Zugelemente 23 auf. Die Varistorsäule 25 ist aus einzelnen, ebenfalls zylindrischen Varistorblöcken zusammengesetzt ist. An den beiden Enden der Varistorsäule 25 sitzen Endarmaturen 21 und 22, von denen in den Fig. 1 und 2 nur die untere Endarmatur 21 sichtbar ist. Die Endarmaturen 21, 22 bestehen meist aus elektrisch leitendem Material. Zugelemente 23 sind in den Endarmaturen 21, 22 unter Zug verpresst und halten so die Varistorsäule 25 zusammen. In die Varistorsäule 25 sind Haltescheiben 24 eingefügt, die Löcher aufweisen, durch die die Zugelemente 23 geführt sind und so das Ableitelement 20 zusätzlich stabilisieren.The FIGS. 1 and 2 show a surge arrester 1 in a sectional view. In a fluid-tight housing 2, a discharge element 20 is arranged. This discharge element 20 has a cylindrical varistor column 25, an upper end fitting 22, a lower end fitting 21 and a plurality of tension elements 23. The varistor column 25 is composed of individual, also cylindrical Varistorblöcken. At the two ends of the varistor column 25 sit end fittings 21 and 22, of which in the Fig. 1 and 2 only the lower end fitting 21 is visible. The end fittings 21, 22 are usually made of electrically conductive material. Tension elements 23 are pressed in the end fittings 21, 22 under train and so hold the varistor column 25 together. In the varistor column 25 retaining disks 24 are inserted, which have holes through which the tension elements 23 are guided and thus stabilize the discharge element 20 additionally.

Das Gehäuse 2 ist im Wesentlichen zylinderförmig. Entlang der Zylinderachse erstreckt sich die Längsachse 50. Das Ableitelement 20 ist entlang dieser Längsachse 50 ausgerichtet. An den beiden Deckflächen ist das Gehäuse 2 fluiddicht verschlossen.The housing 2 is substantially cylindrical. The longitudinal axis 50 extends along the cylinder axis. The discharge element 20 is aligned along this longitudinal axis 50. At the two top surfaces, the housing 2 is closed fluid-tight.

Auf einer Erdanschlusseite des Ableitelementes 20 ist die Deckfläche des Gehäuses 2 mit einem einfachen Gehäusedeckel 4 verschlossen. Ein Kontakt 8 ist elektrisch isoliert durch diesen Gehäusedeckel 4 vom Inneren zum Äußeren des Gehäuses 2 geführt und dient dem Erdungsanschluss. Im Inneren des Gehäuses 2 ist dieser Kontakt 8 elektrisch leitend mit dem Ableitelement 20 beispielsweise mit einem Kabel 15 verbunden. Der Anschluss erfolgt hier über eine leitende Anschlussplatte 13. Zwischen dieser und der unteren Endarmatur 21 befindet sich noch ein isolierendes Zwischenstück 14. Der Anschluss des Kabels 15 könnte alternativ auch direkt an die untere Endarmatur 21 erfolgen, das isolierende Zwischenstück 14 entfällt dann. Die Endarmatur 21 des Ableitelementes 20 ist an dem Gehäusedeckel 4 befestigt. Der Gehäusedeckel 4 ist gegen die Varistorsäule 25 elektrisch isoliert. Die Isolation erfolgt hier durch das Zwischenstück 14. Alternativ kann eine Isolationslage zwischen der unteren Endarmatur 21 und dem Gehäusedeckel 4 eingefügt werden. Der Gehäusedeckel 4 weist in der Regel einen hier nicht dargestellten Anschluss auf, über den Fluid, beispielsweise Schwefelhexafluorid, in das Gehäuse 2 eingefüllt, beziehungsweise abgelassen werden kann.On a Erdanschlusseite the discharge element 20, the top surface of the housing 2 is closed with a simple housing cover 4. A contact 8 is electrically isolated through this housing cover 4 from the inside to the outside of the housing 2 and serves the ground terminal. Inside the housing 2, this contact 8 is electrically conductively connected to the diverting element 20, for example with a cable 15. The connection is made here via a conductive connection plate 13. Between this and the lower end fitting 21 is still an insulating spacer 14. The connection of the cable 15 could alternatively be made directly to the lower end fitting 21, the insulating spacer 14 then deleted. The end fitting 21 of the discharge element 20 is fastened to the housing cover 4. The housing cover 4 is electrically insulated against the varistor column 25. The insulation takes place here through the intermediate piece 14. Alternatively, an insulating layer between the lower end fitting 21 and the housing cover 4 are inserted. As a rule, the housing cover 4 has a connection, not illustrated here, via which fluid, for example sulfur hexafluoride, can be introduced into the housing 2 or drained off.

Auf einer Hochspannungsanschlussseite des Ableitelementes 20 ist die Deckfläche des Gehäuses 2 mit einer Hochspannungsdurchführung 5 versehen, um das elektrische Hochspannungspotential ohne Gefahr eines Überschlags zwischen Hochspannung und geerdetem Gehäuse 2 von außen in das Gehäuse 2 hinein zu führen. Die Durchführung 5 umfasst einen Haltering 12, einen Isolator 6 und einen Kontakt 7, der hier als Steckkontakt ausgeführt ist. Über den Kontakt 7 kann der Überspannungsableiter 1 an eine hier nicht dargestellte gasisolierte Schaltanlage angeschlossen werden. Im Inneren des Gehäuses 2 ist der Kontakt 7 mit einem elektrisch leitenden Formstück 9 versehen. An den Kontaktflächen zum Gehäuse 2 und zur Schaltanlage ist die Durchführung mit Dichtungsringen (10) versehen.On a high-voltage terminal side of the discharge element 20, the top surface of the housing 2 is provided with a high-voltage feedthrough 5 in order to lead the electrical high-voltage potential into the housing 2 from the outside without danger of a flashover between high voltage and earthed housing 2. The implementation 5 comprises a retaining ring 12, an insulator 6 and a contact 7, which is designed here as a plug contact. About the contact 7, the surge arrester 1 can be connected to a gas-insulated switchgear, not shown here. Inside the housing 2 is the contact 7 is provided with an electrically conductive fitting 9. At the contact surfaces to the housing 2 and the switchgear the implementation is provided with sealing rings (10).

Eine im Wesentlichen zylinderförmige, an einem Ende geschlossene Steuerhaube 40 ist über das hochspannungsseitige Ende des Ableitelementes 20 gestülpt. Die Steuerhaube 20 ist mit einer Verschiebungseinrichtung 30 verbunden, die eine Schubstange 33, ein Getriebe 32, das beispielsweise als Trapezgewindegetriebe ausgeführt sein kann, eine fluiddicht durch den Gehäusedeckel 4 geführte Welle 31, sowie ein außerhalb des Gehäuses 2 mit dieser Welle 31 verbundenes Bedienelement 34 aufweist. Zusätzlich kann an dem Bedienelement 34 eine Anzeigevorrichtung 35 angebracht sein, die anzeigt, ob die elektrische Verbindung hergestellt oder unterbrochen ist.A substantially cylindrical, closed at one end control hood 40 is slipped over the high voltage end of the discharge element 20. The control hood 20 is connected to a displacement device 30 which has a push rod 33, a transmission 32, which can be embodied, for example, as a trapezoidal thread drive, a shaft 31 guided fluid-tightly through the housing cover 4, and a control element 34 connected to this shaft 31 outside the housing 2 having. In addition, a display device 35 can be attached to the operating element 34, which indicates whether the electrical connection is established or interrupted.

Über das Bedienelement 34, das hier als Handkurbel dargestellt ist, kann die Welle 31 in eine rotierende Bewegung versetzt werden. Über das Getriebe 32 wird diese Rotationsbewegung in eine lineare Bewegung der Schubstange 33 in Richtung der Längsachse 50 umgesetzt. Die Schubstange 33 wiederum überträgt diese lineare Bewegung auf die Steuerhaube 40. Zur besseren Führung der Schubstange 33 ist diese durch Löcher in den Haltescheiben 24 geführt. Die Steuerhaube 40 kann somit in Richtung der Längsachse 50 zum Kontakt 7 hin und von diesem weg bewegt werden, und so eine elektrische Verbindung hergestellt beziehungsweise unterbrochen werden. In der Darstellung in Fig. 1 ist die elektrische Verbindung unterbrochen.About the control element 34, which is shown here as a hand crank, the shaft 31 can be set in a rotating movement. Via the gear 32, this rotational movement is converted into a linear movement of the push rod 33 in the direction of the longitudinal axis 50. The push rod 33 in turn transmits this linear movement to the control hood 40. For better guidance of the push rod 33, this is guided through holes in the retaining disks 24. The control hood 40 can thus be moved in the direction of the longitudinal axis 50 toward the contact 7 and away therefrom, thus establishing or interrupting an electrical connection. In the illustration in Fig. 1 the electrical connection is interrupted.

In Fig. 2 ist die Steuerhaube 40 soweit zum Kontakt 7 hinbewegt, dass beide sich berühren. Damit ist die elektrische Verbindung hergestellt. Es besteht eine durchgehende elektrische Verbindung von der hochspannungsseitigen Außenseite des Gehäuses 2 über den Kontakt 7, die Steuerhaube 40, dem mit der Steuerhaube 40 elektrisch verbundenen Ableitelement 20 und schließlich dem mit dem Ableitelement 20 elektrisch verbundenen Kontakt 8 auf die erdseitige Außenseite des Gehäuses 2.In Fig. 2 the control hood 40 is moved so far to the contact 7 that both touch. This is the electrical connection is made. There is a continuous electrical connection from the high-voltage side outside of the housing 2 via the contact 7, the control hood 40, the discharge hood 20 electrically connected to the control hood 40 and finally the electrically connected to the discharge element 20 Contact 8 on the earth-side outside of the housing 2.

Fig. 3 zeigt einen Ausschnitt des hochspannungsseitigen Endes des Überspannungsableiters 1 in einer Schittdarstellung. Die elektrische Verbindung ist hier hergestellt. Die Steuerhaube 40 liegt an dem Formstück 9 des Kontaktes 7 an. Steuerhaube 40 und Formstück 9 sind so geformt, dass eine Ausbuchtung des Formstücks 9 in eine entsprechende Einbuchtung des geschlossenen Endes der Steuerhaube 40 greift. Die Steuerhaube 40 wird so in radialer Richtung bezüglich der Längsachse 50 fixiert. Fig. 3 shows a section of the high-voltage side end of the surge arrester 1 in a Schittdarstellung. The electrical connection is made here. The control hood 40 abuts the fitting 9 of the contact 7. Control hood 40 and fitting 9 are shaped so that a bulge of the fitting 9 engages in a corresponding indentation of the closed end of the control hood 40. The control hood 40 is thus fixed in the radial direction with respect to the longitudinal axis 50.

Die Endarmatur 22 weist Gleitlager 41 auf, die die Steuerhaube 40 radial bezüglich der Längsachse 50 festlegen und so die Steuerhaube 40 bei einer Verschiebung in Richtung der Längsachse 50 führen. Die Gleitlager 41 können elektrisch leitend ausgeführt sein und somit gleichzeitig der elektrischen Verbindung der Steuerhaube 40 mit der Endarmatur 22 dienen, sie können aber auch aus einem nichtleitenden Material, wie einem Kunststoff, hergestellt werden. Die elektrische Verbindung der Endarmatur 22 mit der Steuerhaube 40 kann dann beispielsweise über ein flexibles Leiterband erfolgen.The end fitting 22 has plain bearings 41, which fix the control hood 40 radially with respect to the longitudinal axis 50 and thus guide the control hood 40 upon a displacement in the direction of the longitudinal axis 50. The plain bearings 41 may be electrically conductive and thus simultaneously serve the electrical connection of the control hood 40 with the end fitting 22, but they can also be made of a non-conductive material, such as a plastic. The electrical connection of the end fitting 22 with the control hood 40 can then be done for example via a flexible conductor strip.

Claims (9)

  1. Surge arrester (1) having a dissipation element (20), a control cover (40) which is electrically connected to the dissipation element (20), and a fluid-tight housing (2) in which the dissipation element (20) and the control cover (40) are arranged and which has two contacts (7, 8) which in each case electrically connect the interior to the exterior of the housing (2),
    characterized
    in that the dissipation element (20) and the control cover (40) are designed to be moveable with respect to one another, wherein, by virtue of the relative movement, an electrical connection of one of the contacts (7, 8) to the other of the contacts (8, 7) is producible or interruptible via the dissipation element (20).
  2. Surge arrester (1) according to Claim 1,
    characterized
    in that the dissipation element (20) is arranged along a longitudinal axis (50) of the housing and in that the control cover (40) is arranged so as to be displaceable in the direction of said longitudinal axis (50).
  3. Surge arrester (1) according to Claim 2,
    characterized
    in that the control cover (40) is displaceable by means of a displacement device (30) which is actuable from outside the fluid-tight housing (2).
  4. Surge arrester (1) according to Claim 3,
    characterized
    in that the displacement device (30) has a shaft (31) which is actuable by means of rotational movement, a push rod (33) which is connected to the control cover (40) and a transmission (32) which translates the rotational movement of the shaft (31) into a translational movement of the push rod (33).
  5. Surge arrester (1) according to Claim 4,
    characterized
    in that the push rod (33) consists at least partially of electrically insulating material.
  6. Surge arrester (1) according to Claim 4 or 5,
    characterized
    in that the shaft (31) is guided in a fluid-tight manner from the interior to the exterior of the housing (2).
  7. Surge arrester (1) according to any of Claims 2 to 6,
    characterized
    in that one end of the dissipation element (20) is electrically connected to one of the contacts (7, 8) and the other end of the dissipation element (20) is electrically connected to the control cover (40) and in that the electrical connection to the other of the contacts (8, 7) is producible or interruptible by virtue of the displacement of the control cover (40).
  8. Surge arrester (1) according to Claim 7,
    characterized
    in that, when an electrical connection has been produced, the control cover (40) and the other of the contacts (8, 7) engage in one another in a form-fitting manner such that they are radially fixed with respect to the longitudinal axis.
  9. Surge arrester (1) according to Claim 8,
    characterized
    in that the control cover (40) is connected to the dissipation element (20) via slide bearings (41) for displaceability in the direction of the longitudinal axis.
EP12729020.3A 2011-06-10 2012-05-29 Surge arrestor Active EP2702597B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011077394A DE102011077394A1 (en) 2011-06-10 2011-06-10 Surge arresters
PCT/EP2012/059973 WO2012168112A1 (en) 2011-06-10 2012-05-29 Surge arrestor

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EP2702597A1 EP2702597A1 (en) 2014-03-05
EP2702597B1 true EP2702597B1 (en) 2015-03-18

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JP (1) JP5702022B2 (en)
KR (1) KR101476580B1 (en)
CN (1) CN103608874A (en)
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WO (1) WO2012168112A1 (en)

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EP2669903B1 (en) 2012-05-30 2018-09-12 Siemens Aktiengesellschaft Enclosed surge absorber with central feedthrough
DE102012217310A1 (en) 2012-09-25 2014-03-27 Siemens Aktiengesellschaft Surge arresters
DE102012217503A1 (en) 2012-09-27 2014-03-27 Zf Friedrichshafen Ag Transmission for a motor vehicle
CN105122386A (en) 2013-04-26 2015-12-02 西门子公司 Encapsulated surge arrester
EP2846333A1 (en) 2013-09-09 2015-03-11 Siemens Aktiengesellschaft Gas-insulated surge arrestor
EP2854141B1 (en) 2013-09-30 2020-03-25 Siemens Aktiengesellschaft Surge arrester
EP3043024A1 (en) 2015-01-09 2016-07-13 Siemens Aktiengesellschaft Blade platform cooling and corresponding gas turbine
EP3048617B1 (en) * 2015-01-26 2020-08-12 Siemens Aktiengesellschaft Surge absorber
EP3131098B1 (en) 2015-08-12 2018-02-28 Siemens Aktiengesellschaft Enclosed surge voltage protector
DE102016202329A1 (en) * 2016-02-16 2017-08-17 Siemens Aktiengesellschaft arrester
DE102016202326A1 (en) * 2016-02-16 2017-08-17 Siemens Aktiengesellschaft Drive device for a surge arrester
DE102016202327A1 (en) * 2016-02-16 2017-08-17 Siemens Aktiengesellschaft Drive arrangement for forming a separation path for a surge arrester
DE102016206580A1 (en) * 2016-04-19 2017-11-02 Siemens Aktiengesellschaft Arrangement for overvoltage protection of an electrical system insulated with an insulating liquid
JP6595428B2 (en) * 2016-09-16 2019-10-23 株式会社東芝 Lightning arrestor
DE102018215754A1 (en) * 2018-09-17 2020-03-19 Siemens Aktiengesellschaft Surge arrester and method for changing a drive arrangement of a surge arrester

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DE102008034890A1 (en) * 2008-07-24 2010-02-04 Siemens Aktiengesellschaft Surge arrester arrangement with a Ableitstrompfad having several Ableitersäulen

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EP2702597A1 (en) 2014-03-05
KR101476580B1 (en) 2014-12-24
CN103608874A (en) 2014-02-26
DE102011077394A1 (en) 2012-12-13
JP2014523639A (en) 2014-09-11
WO2012168112A1 (en) 2012-12-13
JP5702022B2 (en) 2015-04-15
KR20140012164A (en) 2014-01-29

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