EP2319143B1 - Surge arrestor comprising at least one arrestor element - Google Patents

Surge arrestor comprising at least one arrestor element Download PDF

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Publication number
EP2319143B1
EP2319143B1 EP09782137A EP09782137A EP2319143B1 EP 2319143 B1 EP2319143 B1 EP 2319143B1 EP 09782137 A EP09782137 A EP 09782137A EP 09782137 A EP09782137 A EP 09782137A EP 2319143 B1 EP2319143 B1 EP 2319143B1
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EP
European Patent Office
Prior art keywords
bridge
movable
short
surge arrester
path
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EP09782137A
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German (de)
French (fr)
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EP2319143A1 (en
Inventor
Arnd Ehrhardt
Stefanie Schreiter
Christian Burger
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Dehn SE and Co KG
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Dehn and Soehne GmbH and Co KG
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Priority to SI200930586T priority Critical patent/SI2319143T1/en
Priority to PL09782137T priority patent/PL2319143T3/en
Publication of EP2319143A1 publication Critical patent/EP2319143A1/en
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Publication of EP2319143B1 publication Critical patent/EP2319143B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
    • 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
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure

Definitions

  • the invention relates to a surge arrester having at least one varistor diverter element, as well as a separating device to separate the diverter elements or the grid, wherein the separating device comprises a thermal separation point, which is integrated into the electrical connection path within the arrester, wherein via the separation point a movable Conductor portion or a movable conductive bridge with the diverter on the one hand and the conductor portion or the bridge on the other hand connected to a first electrical outer terminal of the arrester, and comprising a biasing force generating means, such as a spring, wherein the relevant force vector directly or indirectly via a movable divider on the conductor portion or the bridge acts in the separation direction, further in or at the end of the path of movement of the conductor portion or the bridge, a conductive element is arranged, the mi in tripped separation device t comes into contact with the conductor section or bridge and which is in communication with a second external electrical connection in order to form a short-circuiting device, according to the preamble of patent claim 1.
  • the low-resistance short-circuit path connected in this way can be used, for example, to actuate an upstream switching element, which is set to the short-circuit current of the relevant network, or to generate a defined continuous short-circuit, which is defined as a so-called fail-safe state in certain applications.
  • the switching element is a changeover contact.
  • the changeover contact closes the varistor circuit in a known manner via a soldering point. If the switching element is triggered, another contact is closed, which can be connected either as an internal or external defect indicator or just via a corresponding external connection as a short circuit.
  • the switching element is triggered, another contact is closed, which can be connected either as an internal or external defect indicator or just via a corresponding external connection as a short circuit.
  • a classic separation when heating a varistor and its separator is not effective in such DC applications, since the system voltage of photovoltaic systems is up to 1000 V and the interruption of 1000 V DC circuits can be realized only with a considerable constructive or equipment expense.
  • From the DE 10 2006 052 955 A1 is a developed surge arrester with a housing and at least one varistor discharge element, known, according to the preamble of claim 1 wherein there is a separation device and the possibility exists, retrofittable to design the arrester so that it can safely conduct a short-circuit current.
  • known separation devices for surge arresters are equipped with an additional connection, which extends the existing separation function by a short-circuit function.
  • the additional connection can be configured in various ways, so that an activation from the outside of the correspondingly realized surge arrester is also possible as needed.
  • At least one conductive element is arranged in the path of movement of a spring-biased conductor or a spring-biased bridge, the first end of which comes into contact with the conductor section or the bridge when the disconnecting device is triggered.
  • the second end of the conductive element is in communication with a second external electrical connection.
  • means for protecting the contact point between the conductor section or bridge and the conductive element are provided in front of erasing Lotresten or solder material or melting materials.
  • this route still does not have sufficient dielectric strength due to the previous arc load, it will ignite again as a result of the voltage load and an arc will again be created in the arrester. In this case, the separation device has failed.
  • a surge arrester having at least one diverting element, in particular a varistor, as well as a separating device according to the feature combination according to claim 1, wherein the dependent claims comprise at least expedient refinements and developments.
  • a surge arrester with at least one diverting element, for example a varistor, and a separating device, wherein the separating device serves to separate the at least one diverting element from the network.
  • the separating device comprises a per se known thermal separation point, which is integrated into the electrical connection path within the arrester.
  • a per se known thermal separation point is integrated into the electrical connection path within the arrester.
  • a movable conductor portion or a movable conductive bridge with the diverter on the one hand and the conductor portion or the bridge on the other hand connected to a first electrical external terminal of the arrester.
  • biasing force generating means for example, at least one spring present, wherein the force vector of the spring acts directly or indirectly via a movable separating block on the conductor section or the bridge in the separation direction.
  • a conductive element is arranged, which comes into contact with the conductor portion or the bridge when triggered disconnecting device and which is in communication with a second external electrical connection to form a short-circuiter. Furthermore, to break the short circuit in Kurzschtusszweig a backup exists.
  • a movable insulating part is provided, which immediately before or with the achievement of the short-circuit state in thehuiswegverlauf the conductor portion or the bridge dips to counteract a re-ignition of the arc between the conductive element and the separation point or to prevent or suppress this.
  • the movable insulating part may be formed as a plate whose longitudinal extent extends into the path of movement in the rest position.
  • the plate In the actual separation process, the plate is taken from the movable bridge from its rest position. Upon reaching the short-circuit position of the movable bridge, the plate jumps back to its rest position, whereby the separation distance is extended accordingly. The separation distance is securely blocked in this case by the isolation part.
  • the aforementioned wafer according to the first embodiment of the invention may be fixedly mounted at one end and have bending elastic properties.
  • the plate can be rigid, but rotatably mounted at one end.
  • the storage is preferably carried out so that the plate is held spring-assisted in its rest position.
  • the moving out of the plate from the rest position is effected by the kinetic energy of the movable bridge in the separation process, which this energy is supplied by a corresponding spring bias.
  • the movable separating block acts on the bridge in the separation case, wherein the separating block comprises the insulating part or comprises such a part.
  • the isolation trestle with insulating part may have a boomerang-like shape with two legs, wherein the biasing force generating means acts on a first leg, the second leg forms the insulating part and an axis of rotation is located between the two legs.
  • the movable separating block cooperates with a rotary valve as an insulating part, wherein the rotary valve is taken in the separation process by the separation block and penetrates with reaching the short-circuit state in theeekswegverlauf.
  • the rotary valve is mounted on an axis of rotation, which differs from the pivot point of the Abtrennbocks.
  • the movable insulating member is e.g. tubular mounted on or on the bridge displaceable, wherein the insulating part is taken from the separating block, in order to dive or penetrate at the latest in the short-circuited state in the movement path.
  • the above-described surge arrester is particularly characterized by its use in DC voltage systems with high system voltages and operating currents at short-circuit current level, in particular for photovoltaic systems.
  • the embodiments are common, for the purpose of increasing the dielectric strength of the separation distance before switching off an external switching device in the short circuit path to use an insulating part or a slider.
  • This insulating part or the slider is preferably introduced only when the movable tongue 3 has reached the short-circuit contact b. This ensures that the slider is not damaged by the arc and the arc provides a possible alternative way of reignition by burning or bridging the slider sideways. For this purpose, a timely coordinated introduction of the insulating part or the slider in conjunction with the movement of the switching tongue 3 is essential.
  • the slider is not or only slightly with the arc between the parts 3 and c comes into contact, so as not to damage these parts and to avoid unnecessary extension and increase the energy input before the short circuit.
  • the slide or the insulating part should block the separation path as safely as possible and significantly lengthen the path between part 3 and c. This should take place in time safely before switching off the short-circuit current in the short-circuit path, ie before the distance between part 3 and c is applied to the switching voltage of the switching element.
  • a Varistorableiter 2 which has two connection points or connection paths A and B.
  • a movable conductor portion or a movable conductive bridge 3 is pivotally movable about the contact point a.
  • a fixed varistor terminal c is connected to a corresponding end of the tongue 3 e.g. connected by a low-melting solder, so that here the desired thermal separation point results.
  • this separation point melts and it moves the tongue 3 and the movable conductive bridge 3 (as indicated by the arrow representation) in the position 3 '. Then, when the free end of the tongue 3 reaches the conductive member b, which is connected to the connection path B, the desired short circuit is achieved.
  • Fig. 1 is located in the path of movement of the movable conductive bridge 3, for example, an elastic insulating plate 100, which is fastened, for example, at the position 101.
  • a fixed insulating plate 100 which is fixed in a spring-biased or resettable manner at the position 101.
  • the plate 100 is displaced or slightly bent. Just before or when the switching tongue releases the short-circuiter, i. reaches the conductive element b, the plate 100 moves at high speed back to its rest position or initial position, between the parts b and c, so that there is no direct path between these two contacts for a possible arc.
  • a Abtrennbock 13 is present, which is pivotable about a fixed point (arrow display within the part 13).
  • This separation block 13 has a boomerang-like shape.
  • a first end of the Abtrennbocks 13 is biased with a spring 1.
  • the second end of the Abtrennbocks 13 forms the actual insulating part 102nd
  • the bridge 3 moves towards the conductive element b (position 3 '), so that the desired short-circuiting occurs.
  • the insulating part 102 dips into the path between c and b with the result of the desired blocking of the present separation line.
  • the insulating part 102 of the separation block 13 may be guided by grooves, so that no continuous sliding surfaces between the parts c and b remain.
  • the parts c and b or the bridge 3 can also be raised relative to the surface of insulating material which serves to cover the varistor 2 (not shown).
  • the disconnecting block 13 is biased by a spring, not shown there, wherein the biasing force, shown in the direction of the arrow within the part 13 results.
  • a rotary valve 103 is between the Abtrennbock 13 and the bridge 3 as an insulating part.
  • This rotary valve is rotatably supported on a rotation axis whose axis position is different from the rotation axis of the Abtrennbocks 13.
  • the bridge 3 moves from position c to position b, i. to the conductive element b with the result that the desired short-circuit state occurs (positional representation according to 3 ').
  • the short circuit condition and the then changed position of the rotary valve 103 is in the Fig. 3b shown.
  • the rotary valve dips here again in the distance between the parts c and b and increases the separation distance.
  • the position relative to the parts 13 and 103 can also be made resettable.
  • the movement of the rotary valve 103 is coordinated to the movement of the Abtrennbocks 13 and its action on the bridge. 3
  • the rotary valve can also be designed scoop-like or U-shaped to allow lateral sealing off of the contact area.
  • Fig. 4a and 4b show an embodiment in which the insulating part is attached as a slider 104 directly on or on the bridge 3.
  • the movable part 104 is connected in a form-fitting manner to the disconnecting block 13 so that its rotational movement (arrow depiction within the part 13) is transmitted and converted into a longitudinal sliding movement.
  • the insulating member 104 When the shorting position of the bridge 3 is reached, the insulating member 104 has moved down in the figure representation, with a projecting end penetrates into the separation distance between the parts b and c and increases the separation distance.
  • the insulating member 104 may be formed as a pipe or tube with a recess which is pushed completely or only partially over the bridge 3 after the contact separation immediately or delayed in time.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Fuses (AREA)
  • Thermally Actuated Switches (AREA)

Description

Die Erfindung betrifft einen Überspannungsableiter mit mindestens einem Varistor Ableitelement, sowie eine Abtrennvorrichtung, um das oder die Ableitelemente vom Netz zu trennen, wobei die Abtrennvorrichtung eine thermische Trennstelle umfasst, welche in den elektrischen Anschlusspfad innerhalb des Ableiters eingebunden ist, wobei über die Trennstelle ein beweglicher Leiterabschnitt oder eine bewegliche leitende Brücke mit dem Ableitelement einerseits und der Leiterabschnitt oder die Brücke andererseits mit einem ersten elektrischen Außenanschluss des Ableiters verbunden ist, sowie umfassend ein Vorspannkraft erzeugendes Mittel, beispielsweise eine Feder, wobei der diesbezügliche Kraftvektor unmittelbar oder mittelbar über einen beweglichen Trennbock auf den Leiterabschnitt oder die Brücke in Abtrennrichtung wirkt, weiterhin im oder am Ende des Bewegungswegs des Leiterabschnitts oder der Brücke ein leitfähiges Element angeordnet ist, das bei ausgelöster Abtrennvorrichtung mit dem Leiterabschnitt oder der Brücke in Kontakt gelangt und welches mit einem zweiten elektrischen Außenanschluss in Verbindung steht, um einen Kurzschließer zu bilden, gemäß Oberbegriff des Patentanspruchs 1.The invention relates to a surge arrester having at least one varistor diverter element, as well as a separating device to separate the diverter elements or the grid, wherein the separating device comprises a thermal separation point, which is integrated into the electrical connection path within the arrester, wherein via the separation point a movable Conductor portion or a movable conductive bridge with the diverter on the one hand and the conductor portion or the bridge on the other hand connected to a first electrical outer terminal of the arrester, and comprising a biasing force generating means, such as a spring, wherein the relevant force vector directly or indirectly via a movable divider on the conductor portion or the bridge acts in the separation direction, further in or at the end of the path of movement of the conductor portion or the bridge, a conductive element is arranged, the mi in tripped separation device t comes into contact with the conductor section or bridge and which is in communication with a second external electrical connection in order to form a short-circuiting device, according to the preamble of patent claim 1.

Abtrennvorrichtungen auch mit Kurzschlussfunktion, wobei im aufgetrennten bzw. ausgelösten Schaltzustand der Abtrennvorrichtung der Strompfad über das defekte Ableiterelement sich im Kurzschluss derart befindet, dass der Strom vom Ableitelement auf einen geschalteten Bypass kommutiert, sind bekannt.Separating devices with short-circuit function, wherein in the separated or triggered switching state of the disconnecting device, the current path through the defective arrester element is in the short circuit such that the current commutes from the diverter to a switched bypass, are known.

Der so geschaltete niederohmige Kurzschlusspfad kann z.B. dazu genutzt werden, ein vorgeschaltetes Schaltelement, welches auf den Kurzschlussstrom des betreffenden Netzes eingestellt ist, zu betätigen, oder aber einen definierten Dauerkurzschluss zu erzeugen, der bei bestimmten Anwendungen als sogenannter Fail-Safe-Zustand definiert ist.The low-resistance short-circuit path connected in this way can be used, for example, to actuate an upstream switching element, which is set to the short-circuit current of the relevant network, or to generate a defined continuous short-circuit, which is defined as a so-called fail-safe state in certain applications.

Zu diesem Stand der Technik soll beispielsweise auf die EP 0 860 927 A1 hingewiesen werden. In diesem Dokument ist eine sehr aufwendige elektromechanische Einrichtung beschrieben, die den Strom über einen Varistor überwacht und welche nach Überschreiten eines vorgegebenen Grenzwerts den Kurzschluss im Bypass zum Varistorpfad über elektromechanische Kontakte schaltet.To this state of the art, for example, on the EP 0 860 927 A1 be pointed out. In this document, a very complicated electromechanical device is described, which monitors the current through a varistor and which switches after exceeding a predetermined limit, the short circuit in the bypass to the varistor via electromechanical contacts.

Gemäß der DE 37 34 214 C2 gehört eine thermisch auslösbare Abtrennvorrichtung zum Stand der Technik, deren schaltendes Element einen Wechselkontakt darstellt. Der Wechselkontakt schließt den Varistorkreis in bekannter Weise über eine Lotstelle. Wird das Schaltelement ausgelöst, wird ein weiterer Kontakt geschlossen, der entweder als interne oder externe Defektanzeige oder eben über eine entsprechende externe Verbindung als Kurzschluss verschaltet werden kann. Insbesondere bei Photovoltaik-Anlagen ist aufgrund der Charakteristik der speisenden Quelle der dortige Betriebsstrom annähernd gleich dem Kurzschlussstrom. Ein klassisches Abtrennen bei Erwärmung eines Varistors und seiner Abtrennvorrichtung ist bei derartigen Gleichspannungsapplikationen nicht zielführend, da die Systemspannung von Photovoltaik-Anlagen bis zu 1000 V beträgt und die Unterbrechung von 1000 V-Gleichstromkreisen nur mit einem erheblichen konstruktiven oder apparativen Aufwand überhaupt realisierbar ist.According to the DE 37 34 214 C2 includes a thermally triggered separation device of the prior art, the switching element is a changeover contact. The changeover contact closes the varistor circuit in a known manner via a soldering point. If the switching element is triggered, another contact is closed, which can be connected either as an internal or external defect indicator or just via a corresponding external connection as a short circuit. Especially in photovoltaic systems due to the characteristic of the feeding source of the local operating current is approximately equal to the short-circuit current. A classic separation when heating a varistor and its separator is not effective in such DC applications, since the system voltage of photovoltaic systems is up to 1000 V and the interruption of 1000 V DC circuits can be realized only with a considerable constructive or equipment expense.

Aus der DE 10 2006 052 955 A1 ist ein weiterentwickelter Überspannungsableiter mit einem Gehäuse und mindestens einem Varistor Ableitelement, bekannt, gemäß Oberbegriff des Anspruchs 1 wobei dort eine Abtrennvorrichtung vorhanden ist und die Möglichkeit besteht, auch nachrüstbar den Ableiter so auszugestalten, dass dieser einen Kurzschlussstrom sicher führen kann.From the DE 10 2006 052 955 A1 is a developed surge arrester with a housing and at least one varistor discharge element, known, according to the preamble of claim 1 wherein there is a separation device and the possibility exists, retrofittable to design the arrester so that it can safely conduct a short-circuit current.

Hierfür werden an sich bekannte Abtrennvorrichtungen für Überspannungsableiter mit einer zusätzlichen Verbindung ausgerüstet, die die vorhandene Abtrennfunktion um eine Kurzschlussfunktion erweitert. Konkret ist vorgeschlagen, dass die zusätzliche Verbindung verschiedenartig ausgestaltet werden kann, so dass auch nach Bedarf ein Aktivieren von außen am entsprechend realisierten Überspannungsableiter möglich ist.For this purpose, known separation devices for surge arresters are equipped with an additional connection, which extends the existing separation function by a short-circuit function. Specifically, it is proposed that the additional connection can be configured in various ways, so that an activation from the outside of the correspondingly realized surge arrester is also possible as needed.

Hierfür ist im Bewegungsweg eines federvorgespannten Leiters oder einer federvorgespannten Brücke mindestens ein leitfähiges Element angeordnet, dessen erstes Ende bei ausgelöster Abtrennvorrichtung mit dem Leiterabschnitt oder der Brücke in Kontakt gelangt.
Das zweite Ende des leitfähigen Elements ist mit einem zweiten elektrischen Außenanschluss in Verbindung stehend. Außerdem sind Mittel zum Schützen der Kontaktstelle zwischen Leiterabschnitt oder Brücke und dem leitfähigen Element vor wegspratzenden Lotresten oder Lotmaterial bzw. schmelzenden Materialien vorgesehen.For this purpose, at least one conductive element is arranged in the path of movement of a spring-biased conductor or a spring-biased bridge, the first end of which comes into contact with the conductor section or the bridge when the disconnecting device is triggered.
The second end of the conductive element is in communication with a second external electrical connection. In addition, means for protecting the contact point between the conductor section or bridge and the conductive element are provided in front of erasing Lotresten or solder material or melting materials.

Bei dieser bekannten Lehre besteht zwar grundsätzlich die Möglichkeit, den Kurzschlussstrom sicher zu führen. Beim Ansprechen und Öffnen der Abtrennvorrichtung kommt es zur Bildung eines Funkens bzw. Lichtbogens zwischen den Elementen der Trennstelle. Dieser Lichtbogen verlischt erst mit dem Erreichen des Kurzschlusskontakts durch die entsprechende Schaltzunge. Die Strecke zwischen einem festen Varistorkontakt und der Schaltzunge bzw. dem Kurzschlusskontakt besitzt aufgrund der thermischen Wirkung des Lichtbogens unmittelbar nach dem Verlöschen des Lichtbogens nur eine sehr geringe Spannungsfestigkeit, welche zeitlich betrachtet sich auch nur langsam erhöht. Wenn der Kurzschlussstrom im Kurzschlusspfad sehr schnell durch eine entsprechende Schalteinrichtung, z.B. eine Sicherung, unterbrochen werden soll, so baut diese Schalteinrichtung zügig eine hohe Spannung auf, welche die elektrische parallele Strecke zwischen Varistorkontakt und Schaltzunge bzw. Kurzschlusskontakt belastet.In principle, with this known teaching it is possible to safely conduct the short-circuit current. Upon activation and opening of the separating device, a spark or arc is formed between the elements of the separating point. This arc extinguishes only with the achievement of the short-circuit contact by the appropriate switching tongue. The distance between a fixed varistor contact and the switching tongue or the short-circuit contact has due to the thermal effect of the arc immediately after the extinction of the arc only a very low dielectric strength, which increases in terms of time only slowly. If the short circuit current in the short circuit path very quickly by a corresponding switching device, e.g. a fuse is to be interrupted, this switching device quickly builds up a high voltage, which loads the electrical parallel path between the varistor contact and switching tongue or short-circuit contact.

Wenn diese Strecke aufgrund der vorangegangenen Lichtbogenbelastung noch keine ausreichende Spannungsfestigkeit besitzt, zündet diese infolge der Spannungsbelastung erneut und es entsteht wieder ein Lichtbogen im Ableiter. In diesem Falle hat die Abtrennvorrichtung versagt.If this route still does not have sufficient dielectric strength due to the previous arc load, it will ignite again as a result of the voltage load and an arc will again be created in the arrester. In this case, the separation device has failed.

Aus dem Vorgenannten ist es daher Aufgabe der Erfindung, einen weiterentwickelten Überspannungsableiter mit mindestens einem Ableitelement und Kurzschlussfunktion anzugeben, wobei die Spannungsfestigkeit der Trennstrecke vor dem Abschalten einer Schalteinrichtung im Kurzschlusspfad erhöht ist, um einen Ausfall bzw. eine Überlastung des Ableitelements wirksam zu verhindern. Die Lösung der Aufgabe der Erfindung erfolgt durch einen Überspannungsableiter mit mindestens einem Ableitelement, insbesondere einem Varistor, sowie einer Abtrennvorrichtung gemäß der Merkmalskombination nach Patentanspruch 1, wobei die Unteransprüche mindestens zweckmäßige Ausgestaltungen und Weiterbildungen umfassen.From the foregoing, it is therefore an object of the invention to provide a further developed surge arrester with at least one dissipation element and short circuit function, wherein the dielectric strength of the separation path is increased before switching off a switching device in the short circuit path to effectively prevent failure or overloading of the discharge. The object of the invention is achieved by a surge arrester having at least one diverting element, in particular a varistor, as well as a separating device according to the feature combination according to claim 1, wherein the dependent claims comprise at least expedient refinements and developments.

Es wird demnach von einem Überspannungsableiter mit mindestens einem Ableitelement, beispielsweise einem Varistor, sowie einer Abtrennvorrichtung ausgegangen, wobei die Abtrennvorrichtung dazu dient, das mindestens eine Ableitelement vom Netz zu trennen.It is therefore assumed that a surge arrester with at least one diverting element, for example a varistor, and a separating device, wherein the separating device serves to separate the at least one diverting element from the network.

Die Abtrennvorrichtung umfasst eine an sich bekannte thermische Trennstelle, welche in den elektrischen Anschlusspfad innerhalb des Ableiters eingebunden ist. Über die Trennstelle ist ein beweglicher Leiterabschnitt oder eine bewegliche leitende Brücke mit dem Ableitelement einerseits und der Leiterabschnitt oder die Brücke andererseits mit einem ersten elektrischen Außenanschluss des Ableiters verbunden. Es sind weiterhin Vorspannkraft erzeugende Mittel, beispielsweise mindestens eine Feder, vorhanden, wobei der Kraftvektor der Feder unmittelbar oder mittelbar über einen beweglichen Trennbock auf den Leiterabschnitt oder die Brücke in Abtrennrichtung wirkt.
Weiterhin ist im oder am Ende des Bewegungswegs des Leiterabschnitts oder der Brücke ein leitfähiges Element angeordnet, das bei ausgelöster Abtrennvorrichtung mit dem Leiterabschnitt oder der Brücke in Kontakt gelangt und welches mit einem zweiten elektrischen Außenanschluss in Verbindung steht, um einen Kurzschließer zu bilden. Weiterhin ist, zur Unterbrechung des Kurzschlusses im Kurzschtusszweig eine Sicherung, vorhanden.The separating device comprises a per se known thermal separation point, which is integrated into the electrical connection path within the arrester. About the separation point is a movable conductor portion or a movable conductive bridge with the diverter on the one hand and the conductor portion or the bridge on the other hand connected to a first electrical external terminal of the arrester. There are further biasing force generating means, for example, at least one spring present, wherein the force vector of the spring acts directly or indirectly via a movable separating block on the conductor section or the bridge in the separation direction.
Furthermore, at or at the end of the path of movement of the conductor portion or the bridge, a conductive element is arranged, which comes into contact with the conductor portion or the bridge when triggered disconnecting device and which is in communication with a second external electrical connection to form a short-circuiter. Furthermore, to break the short circuit in Kurzschtusszweig a backup exists.

Erfindungsgemäß ist ein bewegliches Isolationsteil vorgesehen, welches unmittelbar vor oder mit dem Erreichen des Kurzschlusszustands in den Bewegungswegverlauf des Leiterabschnitts oder der Brücke eintaucht, um einem Wiederzünden des Lichtbogens zwischen dem leitfähigen Element und der Trennstelle entgegenzuwirken bzw. dieses zu verhindern oder zu unterdrücken.According to the invention, a movable insulating part is provided, which immediately before or with the achievement of the short-circuit state in the Bewegungswegverlauf the conductor portion or the bridge dips to counteract a re-ignition of the arc between the conductive element and the separation point or to prevent or suppress this.

Mit der erfindungsgemäßen Lösung gelingt es, nach dem Verlöschen des Lichtbogens die Festigkeit der Trennstrecke deutlich zu erhöhen, und zwar bevor die vorgeschaltete Abschaltvorrichtung in Form z.B. einer Sicherung eine Spannung erzeugt, die ansonsten eine Wiederzündung der Trennstrecke bewirkt.With the solution according to the invention, it is possible to increase the extinction of the arc significantly the strength of the separation distance, and before the upstream shutdown device in the form of eg a fuse generates a voltage which otherwise causes a re-ignition of the separation distance.

Bei einer ersten Ausführungsform kann das bewegliche Isolationsteil als Plättchen ausgebildet sein, dessen Längsausdehnung in Ruhelage in den Bewegungswegverlauf hineinreicht.In a first embodiment, the movable insulating part may be formed as a plate whose longitudinal extent extends into the path of movement in the rest position.

Beim eigentlichen Abtrennvorgang wird das Plättchen von der beweglichen Brücke aus seiner Ruhelage mitgenommen. Mit Erreichen der Kurzschlussposition der beweglichen Brücke springt das Plättchen in seine Ruhelage zurück, wodurch die Trennstrecke entsprechend verlängert ist. Die Trennstrecke ist in diesem Fall durch das Isolationsteil sicher blockiert.In the actual separation process, the plate is taken from the movable bridge from its rest position. Upon reaching the short-circuit position of the movable bridge, the plate jumps back to its rest position, whereby the separation distance is extended accordingly. The separation distance is securely blocked in this case by the isolation part.

Das vorerwähnte Plättchen gemäß der ersten Ausführungsform der Erfindung kann an einem Ende fest gelagert sein und biegeelastische Eigenschaften aufweisen.The aforementioned wafer according to the first embodiment of the invention may be fixedly mounted at one end and have bending elastic properties.

Alternativ kann das Plättchen starr ausgeführt, jedoch an einem Ende drehbeweglich gelagert werden. Hierbei ist die Lagerung bevorzugt so ausgeführt, dass das Plättchen federkraftunterstützt in seiner Ruhelage gehalten ist. Das Herausbewegen des Plättchens aus der Ruhelage erfolgt durch die Bewegungsenergie der beweglichen Brücke im Abtrennvorgang, welcher diese Energie durch eine entsprechende Federvorspannung zugeführt ist.Alternatively, the plate can be rigid, but rotatably mounted at one end. Here, the storage is preferably carried out so that the plate is held spring-assisted in its rest position. The moving out of the plate from the rest position is effected by the kinetic energy of the movable bridge in the separation process, which this energy is supplied by a corresponding spring bias.

Bei einer zweiten Ausführungsform wirkt der bewegliche Trennbock auf die Brücke im Abtrennfall ein, wobei der Trennbock das Isolationsteil aufweist oder ein solches Teil umfasst.In a second embodiment, the movable separating block acts on the bridge in the separation case, wherein the separating block comprises the insulating part or comprises such a part.

Dabei kann der Trennbock mit Isolationsteil eine einem Bumerang ähnliche Form mit zwei Schenkeln aufweisen, wobei an einem ersten Schenkel das Vorspannkraft erzeugende Mittel angreift, der zweite Schenkel das Isolationsteil bildet und zwischen beiden Schenkeln eine Drehachse befindlich ist.In this case, the isolation trestle with insulating part may have a boomerang-like shape with two legs, wherein the biasing force generating means acts on a first leg, the second leg forms the insulating part and an axis of rotation is located between the two legs.

Bei einer dritten Ausführungsform der Erfindung wirkt der bewegliche Abtrennbock mit einem Drehschieber als Isolationsteil zusammen, wobei der Drehschieber im Abtrennvorgang vom Abtrennbock mitgenommen wird und mit Erreichen des Kurzschlusszustands in den Bewegungswegverlauf eindringt.In a third embodiment of the invention, the movable separating block cooperates with a rotary valve as an insulating part, wherein the rotary valve is taken in the separation process by the separation block and penetrates with reaching the short-circuit state in the Bewegungswegverlauf.

Der Drehschieber ist an einer Drehachse gelagert, die sich vom Drehpunkt des Abtrennbocks unterscheidet.The rotary valve is mounted on an axis of rotation, which differs from the pivot point of the Abtrennbocks.

Bei einer vierten Ausführungsform der Erfindung ist das bewegliche Isolationsteil z.B. rohrförmig an oder auf der Brücke verschieblich gelagert, wobei das Isolationsteil vom Trennbock mitgenommen wird, um spätestens im Kurzschlusszustand in den Bewegungswegverlauf einzutauchen bzw. einzudringen.In a fourth embodiment of the invention, the movable insulating member is e.g. tubular mounted on or on the bridge displaceable, wherein the insulating part is taken from the separating block, in order to dive or penetrate at the latest in the short-circuited state in the movement path.

Der vorstehend geschilderte Überspannungsableiter ist insbesondere gekennzeichnet durch dessen Verwendung in Gleichspannungsanlagen mit hohen Systemspannungen und Betriebsströmen auf Kurzschlussstromniveau, insbesondere für Photovoltaik-Anlagen.The above-described surge arrester is particularly characterized by its use in DC voltage systems with high system voltages and operating currents at short-circuit current level, in particular for photovoltaic systems.

Die Erfindung soll nachstehend anhand eines Ausführungsbeispiels sowie unter Zuhilfenahme von Figuren näher erläutert werden.The invention will be explained below with reference to an embodiment and with the aid of figures.

Hierbei zeigen:

Fig. 1
eine prinzipielle Darstellung der ersten Ausführungsform mit einem Isolationsplättchen;
Fig. 2a
eine Darstellung der zweiten Ausführungsform der Erfindung mit einem speziell geformten Abtrennbock, der ein integriertes Isolationsteil aufweist, im Zustand vor dem Abtrennvorgang;
Fig. 2b
eine Darstellung ähnlich derjenigen nach Fig. 2a, jedoch im Zustand nach der Abtrennung und Realisierung des Kurzschlusses;
Fig. 3a
eine weitere Ausführungsform der Erfindung mit einem Drehschieber, der von einem drehbeweglichen Abtrennbock mindestens teilweise mitgenommen wird, im Zustand vor der Abtrennung;
Fig. 3b
eine Darstellung ähnlich derjenigen nach Fig. 3a, jedoch im Zustand der Abtrennung und des erreichten Kurzschlusses;
Fig. 4a
eine vierte Ausführungsform der Erfindung mit einem als Schieber ausgebildeten Isolationsteil im Zustand vor der Abtrennung und
Fig. 4b
eine Darstellung ähnlich derjenigen nach Fig 4a, jedoch im abgetrennten und Kurzschlusszustand.
Hereby show:
Fig. 1
a schematic representation of the first embodiment with an insulation wafer;
Fig. 2a
a representation of the second embodiment of the invention with a specially shaped Abtrennbock having an integrated insulation member, in the state before the separation process;
Fig. 2b
a representation similar to that after Fig. 2a , but in the state after the separation and realization of the short circuit;
Fig. 3a
a further embodiment of the invention with a rotary valve, which is at least partially entrained by a rotatable Abtrennbock, in the state before the separation;
Fig. 3b
a representation similar to that after Fig. 3a but in the state of separation and reached short circuit;
Fig. 4a
a fourth embodiment of the invention with a trained as a slide insulating part in the state before the separation and
Fig. 4b
a representation similar to that after Fig. 4a , but in the isolated and short circuit state.

Den Ausführungsbeispielen ist gemeinsam, zum Zweck der Erhöhung der Spannungsfestigkeit der Trennstrecke vor dem Abschalten einer externen Schalteinrichtung im Kurzschlusspfad ein Isolationsteil oder einen Schieber einzusetzen.The embodiments are common, for the purpose of increasing the dielectric strength of the separation distance before switching off an external switching device in the short circuit path to use an insulating part or a slider.

Dieser Schieber aus Isolationsmaterial wird zwischen die Trennstelle c bzw. das feste Varistoranschlussbein und den Kurzschlusskontakt b geschoben, so dass die Strecke zwischen den Kontakten c und b verlängert ist und ein Wiederzünden erschwert wird.This slide of insulating material is pushed between the separation point c or the fixed Varistoranschlussbein and the short-circuit contact b, so that the distance between the contacts c and b is extended and re-ignition is difficult.

Dieses Isolationsteil oder der Schieber wird bevorzugt erst dann eingebracht, wenn die bewegliche Schaltzunge 3 den Kurzschlusskontakt b erreicht hat. Dies stellt sicher, dass der Schieber nicht durch den Lichtbogen geschädigt wird und der Lichtbogen durch Abbrand oder seitliches Brücken des Schiebers einen möglichen alternativen Weg für das Wiederzünden ermöglicht. Hierfür ist ein zeitlich koordiniertes Einbringen des Isolationsteils bzw. des Schiebers in Verbindung mit der Bewegung der Schaltzunge 3 wesentlich.This insulating part or the slider is preferably introduced only when the movable tongue 3 has reached the short-circuit contact b. This ensures that the slider is not damaged by the arc and the arc provides a possible alternative way of reignition by burning or bridging the slider sideways. For this purpose, a timely coordinated introduction of the insulating part or the slider in conjunction with the movement of the switching tongue 3 is essential.

Vorstehender Sachverhalt unterscheidet sich von Schiebern, die unmittelbar bei der Öffnung einer Abtrennvorrichtung zwischen die Kontakte einfahren, um einen dort entstehenden Lichtbogen zu löschen. Bei derartigen Lösungen wird das Schaltvermögen von Ableitern ohne Kurzschlusspfad durch den Schieber unmittelbar erhöht. Eine solche Maßnahme ist bei geringen Überlasten und beim Einsatz in Wechselstromnetzen durchaus angebracht. Bei hohen Überlasten oder aber auch beim Einsatz im Gleichspannungsbereich ist die direkte Lichtbogenlöschung mittels Schieber problematisch.The above situation differs from sliders, which enter directly at the opening of a separating device between the contacts to extinguish an arc there. In such solutions, the switching capacity of arresters without short circuit path through the slider is increased immediately. Such a measure is quite appropriate for low overloads and when used in AC networks. At high overloads or even when used in the DC voltage range, the direct arc quenching by means of slide is problematic.

Bei der vorliegenden Erfindung ist entscheidend, dass der Schieber möglichst nicht bzw. nur gering mit dem Lichtbogen zwischen den Teilen 3 und c in Berührung kommt, um diese Teile nicht zu schädigen sowie eine unnötige Verlängerung sowie Erhöhung des Energieeintrags vor dem Kurzschluss zu vermeiden.In the present invention, it is crucial that the slider is not or only slightly with the arc between the parts 3 and c comes into contact, so as not to damage these parts and to avoid unnecessary extension and increase the energy input before the short circuit.

Nach dem Herstellen des Kurzschlusses zwischen den Teilen 3 und b soll der Schieber oder das Isolationsteil die Trennstrecke möglichst sicher blockieren und den Weg zwischen Teil 3 und c deutlich verlängern.
Dies soll zeitlich gesehen sicher vor der Abschaltung des Kurzschlussstroms im Kurzschlusspfad erfolgen, also bevor die Strecke zwischen Teil 3 und c mit der Schaltspannung des Schaltelements beaufschlagt wird.After establishing the short circuit between the parts 3 and b, the slide or the insulating part should block the separation path as safely as possible and significantly lengthen the path between part 3 and c.
This should take place in time safely before switching off the short-circuit current in the short-circuit path, ie before the distance between part 3 and c is applied to the switching voltage of the switching element.

Bei der ersten Ausführungsform gemäß Fig. 1 wird von einem Varistorableiter 2 ausgegangen, der zwei Anschlussstellen oder Anschlusspfade A und B aufweist.In the first embodiment according to Fig. 1 is assumed by a Varistorableiter 2, which has two connection points or connection paths A and B.

Ein beweglicher Leiterabschnitt oder eine bewegliche leitende Brücke 3 ist um den Kontaktpunkt a verschwenkbeweglich. Ein fester Varistoranschluss c ist mit einem entsprechenden Ende der Zunge 3 z.B. durch ein niedrigschmelzendes Lot verbunden, so dass sich hier die gewünschte thermische Trennstelle ergibt.A movable conductor portion or a movable conductive bridge 3 is pivotally movable about the contact point a. A fixed varistor terminal c is connected to a corresponding end of the tongue 3 e.g. connected by a low-melting solder, so that here the desired thermal separation point results.

Im Überlastfall schmilzt diese Trennstelle und es bewegt sich die Zunge 3 bzw. die bewegliche leitende Brücke 3 (wie mit der Pfeildarstellung angedeutet) in die Position 3'. Dann, wenn das freie Ende der Zunge 3 das leitfähige Element b erreicht, welches mit dem Anschlusspfad B verbunden ist, wird der gewünschte Kurzschluss erreicht.In case of overload, this separation point melts and it moves the tongue 3 and the movable conductive bridge 3 (as indicated by the arrow representation) in the position 3 '. Then, when the free end of the tongue 3 reaches the conductive member b, which is connected to the connection path B, the desired short circuit is achieved.

Gemäß Fig. 1 befindet sich im Bewegungsweg der beweglichen leitenden Brücke 3 ein z.B. elastisches Isolationsplättchen 100, das z.B. an der Position 101 befestigbar ist.According to Fig. 1 is located in the path of movement of the movable conductive bridge 3, for example, an elastic insulating plate 100, which is fastened, for example, at the position 101.

Alternativ kann auch ein festes Isolationsplättchen 100 eingesetzt werden, das federvorgespannt drehbeweglich bzw. rücksetzbar an der Position 101 fixiert ist.Alternatively, it is also possible to use a fixed insulating plate 100, which is fixed in a spring-biased or resettable manner at the position 101.

Bei der Bewegung der Brücke 3 wird das Plättchen 100 verschoben bzw. leicht verbogen. Kurz bevor oder wenn die Schaltzunge den Kurzschließer, d.h. das leitfähige Element b erreicht, bewegt sich das Plättchen 100 mit hoher Geschwindigkeit wieder in seine Ruhelage oder Ausgangslage zurück, und zwar zwischen die Teile b und c, so dass hier kein direkter Weg mehr zwischen diesen beiden Kontakten für einen eventuellen Lichtbogen vorhanden ist.During the movement of the bridge 3, the plate 100 is displaced or slightly bent. Just before or when the switching tongue releases the short-circuiter, i. reaches the conductive element b, the plate 100 moves at high speed back to its rest position or initial position, between the parts b and c, so that there is no direct path between these two contacts for a possible arc.

Bei der Ausführungsform nach den Fig. 2a und 2b ist ein Abtrennbock 13 vorhanden, der um einen Fixpunkt verschwenkbeweglich ist (Pfeildarstellung innerhalb des Teils 13). Dieser Abtrennbock 13 weist eine Bumerang-ähnliche Form auf. Ein erstes Ende des Abtrennbocks 13 ist mit einer Feder 1 unter Vorspannung stehend.In the embodiment of the Fig. 2a and 2 B is a Abtrennbock 13 is present, which is pivotable about a fixed point (arrow display within the part 13). This separation block 13 has a boomerang-like shape. A first end of the Abtrennbocks 13 is biased with a spring 1.

Das zweite Ende des Abtrennbocks 13 bildet das eigentliche Isolationsteil 102.The second end of the Abtrennbocks 13 forms the actual insulating part 102nd

Wenn im Überlastfall sich die thermische Trennstelle löst, dann bewegt sich die Brücke 3 (Pfeildarstellung) hin zum leitfähigen Element b (Position 3'), so dass der gewünschte Kurzschlussfall eintritt. In diesem Moment taucht das Isolationsteil 102 in die Strecke zwischen c und b ein mit der Folge der gewünschten Blockierung der hier vorhandenen Trennstrecke.If, in the event of an overload, the thermal separation point is released, then the bridge 3 (arrow illustration) moves towards the conductive element b (position 3 '), so that the desired short-circuiting occurs. At this moment, the insulating part 102 dips into the path between c and b with the result of the desired blocking of the present separation line.

Das Isolationsteil 102 des Abtrennbocks 13 kann durch Nuten geführt sein, so dass keine durchgängigen Gleitflächen zwischen den Teilen c und b bestehen bleiben. Alternativ bzw. zusätzlich können die Teile c und b bzw. die Brücke 3 auch erhöht gegenüber der Fläche aus Isolationsmaterial, welches zur Abdeckung des Varistors 2 dient (nicht gezeigt), ausgeführt sein.The insulating part 102 of the separation block 13 may be guided by grooves, so that no continuous sliding surfaces between the parts c and b remain. Alternatively or additionally, the parts c and b or the bridge 3 can also be raised relative to the surface of insulating material which serves to cover the varistor 2 (not shown).

Die erreichte Position des Isolationsteils 102 im Kurzschluss- und Abtrennfall zeigt die Darstellung nach Fig. 2b.The achieved position of the insulating part 102 in the case of short circuiting and disconnection is shown by the illustration Fig. 2b ,

Bei dem Ausführungsbeispiel gemäß den Fig. 3a und 3b ist der Abtrennbock 13 durch eine dort nicht gezeigte Feder vorgespannt, wobei sich die Vorspannkraft, in Richtung des Pfeils innerhalb des Teils 13 gezeigt, ergibt.In the embodiment according to the Fig. 3a and 3b the disconnecting block 13 is biased by a spring, not shown there, wherein the biasing force, shown in the direction of the arrow within the part 13 results.

Zwischen dem Abtrennbock 13 und der Brücke 3 befindet sich ein Drehschieber 103 als Isolationsteil.Between the Abtrennbock 13 and the bridge 3 is a rotary valve 103 as an insulating part.

Dieser Drehschieber ist an einer Drehachse drehbeweglich gehalten, deren Achsenposition sich von der Drehachse des Abtrennbocks 13 unterscheidet.This rotary valve is rotatably supported on a rotation axis whose axis position is different from the rotation axis of the Abtrennbocks 13.

Im thermischen Überlastfall bewegt sich die Brücke 3 von der Position c zur Position b, d.h. zum leitfähigen Element b hin mit der Folge, dass der gewünschte Kurzschlusszustand eintritt (Positionsdarstellung gemäß 3').In thermal overload, the bridge 3 moves from position c to position b, i. to the conductive element b with the result that the desired short-circuit state occurs (positional representation according to 3 ').

Der Kurzschlusszustand und die dann veränderte Lage des Drehschiebers 103 ist in der Fig. 3b gezeigt. Der Drehschieber taucht hier wiederum in die Strecke zwischen den Teilen c und b ein und vergrößert den Trennabstand.The short circuit condition and the then changed position of the rotary valve 103 is in the Fig. 3b shown. The rotary valve dips here again in the distance between the parts c and b and increases the separation distance.

Wenn gewünscht, kann die Position bezogen auf die Teile 13 und 103 auch rücksetzbar ausgeführt sein.If desired, the position relative to the parts 13 and 103 can also be made resettable.

Die Bewegung des Drehschiebers 103 erfolgt koordiniert zur Bewegung des Abtrennbocks 13 und dessen Einwirkung auf die Brücke 3.The movement of the rotary valve 103 is coordinated to the movement of the Abtrennbocks 13 and its action on the bridge. 3

Der Drehschieber kann auch schaufelartig oder U-förmig gestaltet werden, um eine seitliche Abschottung des Kontaktbereichs zu ermöglichen.The rotary valve can also be designed scoop-like or U-shaped to allow lateral sealing off of the contact area.

Die Fig. 4a und 4b zeigen eine Ausführungsform, bei welcher das Isolationsteil als Schieber 104 unmittelbar an oder auf der Brücke 3 befestigt ist.The Fig. 4a and 4b show an embodiment in which the insulating part is attached as a slider 104 directly on or on the bridge 3.

Das bewegliche Teil 104 ist dabei formschlüssig mit dem Abtrennbock 13 in Verbindung stehend, so dass sich dessen Drehbewegung (Pfeildarstellung innerhalb des Teils 13) überträgt und in eine Längsverschiebebewegung umwandelt.In this case, the movable part 104 is connected in a form-fitting manner to the disconnecting block 13 so that its rotational movement (arrow depiction within the part 13) is transmitted and converted into a longitudinal sliding movement.

Wenn die Kurzschlussposition der Brücke 3 erreicht ist, hat sich das Isolationsteil 104 in der Figurendarstellung nach unten bewegt, wobei ein vorspringendes Ende in die Trennstrecke zwischen den Teilen b und c eindringt und den Trennungsabstand erhöht.When the shorting position of the bridge 3 is reached, the insulating member 104 has moved down in the figure representation, with a projecting end penetrates into the separation distance between the parts b and c and increases the separation distance.

Das Isolationsteil 104 kann als Rohr oder Rohr mit Ausnehmung ausgebildet sein, welches nach der Kontakttrennung sofort oder zeitlich verzögert vollständig bzw. nur partiell über die Brücke 3 geschoben wird.The insulating member 104 may be formed as a pipe or tube with a recess which is pushed completely or only partially over the bridge 3 after the contact separation immediately or delayed in time.

Durch die Verschiebung und die Gestaltung des Teils 104 lässt sich beeinflussen, ob eine lichtbogenlöschende Funktion bzw. eine Eindringung erst nach der Realisierung des Kurzschlusses gewünscht ist.By the displacement and the design of the part 104 can be influenced whether an arc-extinguishing function or a penetration is desired only after the realization of the short circuit.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Federfeather
22
Varistorvaristor
33
bewegliche Brückemovable bridge
3'3 '
Kurzschlussposition der beweglichen BrückeShort circuit position of the movable bridge
aa
fester Anschlusspunkt der beweglichen Brücke 3fixed connection point of the movable bridge 3
bb
leitfähiges Elementconductive element
cc
thermische Trennstelle bzw. fester Varistoranschlussthermal separation point or fixed varistor connection
A; BA; B
Anschlusspfadconnection path
1313
Abtrennbockdisconnecting
100, 102, 103, 104100, 102, 103, 104
bewegliches Isolationsteilmovable isolation part
101101
Festpunkt für bewegliches Isolationsteil 100 oder Drehpunkt desselbenFixed point for movable isolation part 100 or fulcrum thereof

Claims (11)

  1. Surge arrester comprising at least one varistor-arrester element (2) as well as a disconnection device for disconnecting the arrester element(s) (2) from the mains, wherein the disconnection device comprises a thermal point of separation (c) which is incorporated in the electrical connection path within the arrester, wherein a movable conductor section or a movable conductive bridge (3) is connected by means of the point of separation (c) to the arrester element (2) on the one hand, and the conductor section or the bridge (3) is connected to a first external electrical connection (A) of the arrester on the other hand, and comprising a means for generating a preload force, such as a spring (1), wherein the force vector associated therewith acts directly or indirectly on the conductor section or the bridge (3) in the disconnecting direction by means of a movable disconnecting component (13), wherein further a conductive element (b) is disposed in or at the end of the path of the movement of the conductor section or the bridge (3), which comes into contact with the conductor section or the bridge (3) when the disconnection device is released and which is connected to a second external electrical connection (B) for forming a short-circuiting device,
    characterized in that
    a movable insulating part (100; 102; 103; 104) is provided which penetrates into the path of movement of the conductor section or the bridge (3) immediately prior to or upon reaching the short-circuit state in order to prevent or suppress a re-ignition of the arc between the conductive element (b) and the point of separation (c), wherein further a fuse for breaking the short circuit is provided in the short-circuit branch.
  2. Surge arrester according to claim 1,
    characterized in that
    the movable insulating part is realized in the form of a plate (100) the longitudinal expansion of which extends into the path of movement in a rest position, wherein, during the disconnection process, the plate (100) is carried along from its rest position by the movable bridge (3) and returns into its rest position upon reaching the short-circuit position of the movable bridge (3).
  3. Surge arrester according to claim 2,
    characterized in that
    the plate (100) is mounted in a fixed manner on one end and has resiliently flexible properties.
  4. Surge arrester according to claim 2,
    characterized in that
    the plate (100) is rigid and mounted to be rotationally movable on one end.
  5. Surge arrester according to claim 4,
    characterized in that
    the plate (100) is held in its rest position with the aid of a spring force.
  6. Surge arrester according to claim 1,
    characterized in that
    the movable disconnecting component (13) acts on the bridge (3) in the event of a disconnection, wherein the insulation part (102) is integrated in the disconnecting component (13) or the disconnecting component (13) comprises such a part.
  7. Surge arrester according to claim 6,
    characterized in that
    the disconnecting component with the insulating part (102) has a shape similar to a boomerang including two legs, wherein the means generating the preload force acts on a first leg, the second leg forms the insulating part (102), and a rotational axis is located between both legs.
  8. Surge arrester according to claim 1,
    characterized in that
    the movable disconnecting component (13) interacts with a rotary slide (103) as insulating part, wherein the rotary slide (103) is carried along by the disconnecting component (13) during the disconnection process and penetrates into the path of movement when the short-circuit state is reached.
  9. Surge arrester according to claim 8,
    characterized in that
    the rotary slide (103) is mounted on a rotational axis that differs from the pivot point of the disconnecting component (13).
  10. Surge arrester according to claim 1,
    characterized in that
    the movable insulating part (104) is displaceably mounted at or on the bridge (3), wherein the insulating part (104) is carried along by the disconnecting component (13) so as to penetrate into the path of movement at the latest in the short-circuit state.
  11. Surge arrester according to one of the preceding claims,
    characterized by
    the use thereof in direct voltage systems with high system voltages and operating currents on a short-circuit current level, specifically for photovoltaic installations.
EP09782137A 2008-08-25 2009-08-25 Surge arrestor comprising at least one arrestor element Active EP2319143B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200930586T SI2319143T1 (en) 2008-08-25 2009-08-25 Surge arrestor comprising at least one arrestor element
PL09782137T PL2319143T3 (en) 2008-08-25 2009-08-25 Surge arrestor comprising at least one arrestor element

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008039626 2008-08-25
DE102009004703.4A DE102009004703B4 (en) 2008-08-25 2009-01-15 Surge arrester with at least one diverting element
PCT/EP2009/060900 WO2010023193A1 (en) 2008-08-25 2009-08-25 Surge arrestor comprising at least one arrestor element

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EP2319143A1 EP2319143A1 (en) 2011-05-11
EP2319143B1 true EP2319143B1 (en) 2013-03-06

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EP (1) EP2319143B1 (en)
CN (1) CN102132467B (en)
DE (2) DE202009018118U1 (en)
PL (1) PL2319143T3 (en)
SI (1) SI2319143T1 (en)
WO (1) WO2010023193A1 (en)

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DE102012014595A1 (en) * 2012-07-24 2014-01-30 Phoenix Contact Gmbh & Co. Kg Device for protection against thermal overload of a component to be protected
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CN102132467A (en) 2011-07-20
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DE102009004703A1 (en) 2010-04-08
DE202009018118U1 (en) 2011-02-10
DE102009004703B4 (en) 2014-05-28
SI2319143T1 (en) 2013-07-31
US20110211287A1 (en) 2011-09-01
US8861157B2 (en) 2014-10-14
EP2319143A1 (en) 2011-05-11

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