EP1523792B1 - Element de protection pour deriver des surtensions et utilisation correspondante - Google Patents

Element de protection pour deriver des surtensions et utilisation correspondante Download PDF

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Publication number
EP1523792B1
EP1523792B1 EP03787688A EP03787688A EP1523792B1 EP 1523792 B1 EP1523792 B1 EP 1523792B1 EP 03787688 A EP03787688 A EP 03787688A EP 03787688 A EP03787688 A EP 03787688A EP 1523792 B1 EP1523792 B1 EP 1523792B1
Authority
EP
European Patent Office
Prior art keywords
varistor
cup
contact pin
surge arrester
intermediate piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP03787688A
Other languages
German (de)
English (en)
Other versions
EP1523792A1 (fr
Inventor
Jürgen Boy
Norbert Krost
Frank Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Electronics AG
Original Assignee
Epcos AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Epcos AG filed Critical Epcos AG
Publication of EP1523792A1 publication Critical patent/EP1523792A1/fr
Application granted granted Critical
Publication of EP1523792B1 publication Critical patent/EP1523792B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • 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
    • 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
    • H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
    • H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed

Definitions

  • a protective element for dissipating electrical surges for example, the DE 43 31 215 A1 known. It consists of a parallel connection of a surge arrester, an air spark gap and a varistor, which are arranged in a cup-shaped metallic sleeve.
  • the varistor is ring-shaped and sits directly on the surge arrester. Through the opening of the annular varistor, a contact pin is guided, which is contacted with the upper electrode of the surge arrester. Lower electrode of the surge arrester and upper electrode of the varistor are connected to the cup-shaped sleeve.
  • Such a protective element of parallel-connected varistor and surge arrester has the advantage that with steeply increasing overvoltages, the ignition delay of the surge arrester is bridged with the aid of the prematurely responding varistor. In this way, the protective effect of the protective element is improved during the response time of the surge arrester.
  • a disadvantage of the known protective element is that the annular varistor has a high intrinsic capacity. This determines the damping behavior of the protective element when it is used in high-frequency circuits. A higher capacity leads to higher attenuation, which in turn reduces the line length that can be realized with such a protective element.
  • the object of the invention is therefore to provide such a protective element which avoids the mentioned disadvantages of known protective elements.
  • a varistor and a surge arrester are arranged one above the other in an electrically conductive cup and electrically connected in parallel between the cup and a contact pin.
  • the varistor is disk-shaped and sits directly on a first electrode of the surge arrester.
  • the second electrode of the surge arrester sits on the bottom of the cup and contacts it electrically.
  • the upper electrode of the varistor is electrically connected to the cup.
  • the contact pin is electrically conductively connected to the first electrode of the surge arrester and is at least partially guided in the space between the varistor and the cup. Between varistor and contact pin an insulating intermediate piece is arranged.
  • varistor and surge arrester are rotationally symmetrical and arranged concentrically or coaxially with each other in the cup.
  • the diameter of the cup is determined by the diameter of the surge arrester.
  • the upper electrode of the varistor is mechanically and electrically connected to a spreader, which has at least two arms which are spread against the inner wall of the cup and electrically connect the upper electrode of the varistor with the cup.
  • a spreader which has at least two arms which are spread against the inner wall of the cup and electrically connect the upper electrode of the varistor with the cup.
  • the contact pin has at least two feet, which are guided laterally between the varistor and the inner wall of the cup to the first electrode of the surge arrester. These feet are then offset against the arms of the expansion element, or are passed between them.
  • the electrically insulating intermediate piece is preferably formed elastically and has such a shape that it can firmly abut the inner wall of the cup in the manner of a rubber stopper.
  • the intermediate piece has openings through which the feet of the contact pin are guided.
  • the arms of the expansion element are preferably bent upwards on the cup wall, whereby openings in the intermediate piece are advantageously also provided for the upwardly bent ends of the arms of the expansion element.
  • Number of feet and arms of the expansion element preferably correspond to each other and are then arranged in pairs or alternately.
  • the spreader element has three arms and the contact pin has three feet.
  • the intermediate piece on a disk-shaped base body having in the middle on at least one side of a recess which is adapted to the diameter of the contact pin and / or the varistor, wherein the contact pin and / or varistor are at least partially sunk in the recess of the intermediate piece.
  • the intermediate piece forms the upper end of the cup, wherein the contact pin projects beyond the cup wall and the intermediate piece.
  • the arms of the expansion element terminate below the upper cup rim and can be completely covered in an advantageous embodiment of the upper portion of the intermediate piece.
  • Cup and contact pin are advantageously formed of brass.
  • the varistor is advantageously designed as a known metal oxide varistor.
  • the surge arrester can be chosen arbitrarily and is known in its exact configuration per se.
  • gas-filled surge arresters are used, which have a priming line and can form a gas discharge to a discharge electrode in the event of overvoltage.
  • FIG. 1 shows on the basis of a schematic cross section through a protective element according to the invention the basic structure of such.
  • the protective element is arranged in a cup B, which consists of a substantially cylindrical cup wall BW and a cup bottom BB.
  • a surge arrester UA Within the cup B, a surge arrester UA, a varistor V, an intermediate piece ZS and above a contact pin KS are arranged one above the other.
  • the surge arrester UA is seated on the cup bottom BB and is electrically connected thereto via its second electrode E2.
  • the varistor V is seated on the surge arrester UA and is connected via its lower electrode to the first electrode E1 of the surge arrester.
  • the intermediate piece is arranged in a form-fitting manner between the contact pin and the varistor and electrically insulates them from each other.
  • the upper electrode of the varistor is connected to the cup wall BW via an electrical connection EV.
  • the contact pin KS is connected via a foot to the first electrode E1 of the surge arrester. In this way, an electrical parallel connection of the two protective components of the protective element results between the contact pin KS and the cup B.
  • the protective element In a preferred use of the protective element, this is held by a spring tension between two contacts which are in communication with the contact pin KS and the cup bottom BB. In this way, an additional mechanical fixation of the individual parts of the protective element is not required. But it is possible that individual parts of the protective element are positively inserted in the cup B and are fixed in this way mechanically with this. there It makes sense to fit the surge arrester as the volume-largest component of the protective element form fit into the cup.
  • the intermediate piece may be positive, in particular since this is preferably made of an elastic material, such as rubber or silicone rubber. Another fixation can take place via the electrical connection EV, which is formed in one embodiment as a spreading element, which has at least two arms that can be braced against the inner cup wall BW.
  • the foot F of the contact pin KS is performed as shown by the intermediate piece ZS. However, it is also possible to design the electrically insulating intermediate piece with a smaller diameter, the foot then being guided past the intermediate piece to the surge arrester UA
  • FIG. 2a shows a specific embodiment of the invention, which the in FIG. 1 obeyed principle. More detailed here is the structure of the surge arrester UA. This consists essentially of a ceramic sleeve KH and two electrodes E1, E2, which form a spark gap in the interior of the gas-filled cavity of the ceramic sleeve KH.
  • the varistor V sits on the first electrode E1 and is arranged here in a depression of the first electrode E1. As a result, the height of the entire protection element can be reduced. Within the recess, the varistor is arranged on a mesa-like flattened elevation, so that only a central region of the lower electrode of the varistor contacts the first electrode E1 of the surge arrester UA. This ensures that only the metallization of the varistor is contacted and unwanted current paths are avoided over the lateral surfaces of the disc-shaped varistor.
  • the upper electrode of the varistor V is connected to a metallic expansion element SE, of which in the figure one of the present in particular in triplicate arms is shown in section. These consist for example of metallic strips which are bent upwards at the end and can be fitted in a form-fitting manner in the cup as a whole.
  • a metallic expansion element SE of which in the figure one of the present in particular in triplicate arms is shown in section. These consist for example of metallic strips which are bent upwards at the end and can be fitted in a form-fitting manner in the cup as a whole.
  • an electrically insulating intermediate piece is arranged. This has in the region of the cup wall on a continuous or blind hole-like opening, through which the bent end of the expansion element SE is guided and abuts there against the cup wall BW.
  • On the intermediate piece ZS sits on the contact pin, which has at least one foot F, which is passed through a further opening of the intermediate piece down and electrically connected to the first electrode E1 of the surge arrester UA.
  • the electrical connection
  • the electrical connection between the contact pin KS and its foot F is preferably designed as a solder joint, as well as the connection between the upper electrode of the varistor and the expansion element SE.
  • the electrical connection between the lower electrode of the varistor and the upper electrode E1 of the surge arrester is likewise electrically conductive, for example a soldered connection or else designed as an electrically conductive adhesive connection. However, it is also possible to carry out this electrical connection as a press contact.
  • FIG. 2a illustrated protective element is a step-like extension ST of the cross section of the cup, which leads above the step-like extension ST to a larger inner diameter.
  • This has the consequence that forms an air gap between the outer edge region of the first electrode E1 of the surge arrester UA and the cup wall, on the one hand this electrode E1 of the cup wall BW electrically insulated and on the other hand provides an additional air spark gap.
  • This allows a second current path, which leads in the unlikely event of a total failure of the surge arrester (eg in case of leakage) to safely dissipate this overvoltage by means of sparkover to the cup wall.
  • FIG. 2b shows the device of FIG. 2a in the plan view.
  • the protective element is preferably formed rotationally symmetrical with a central axis of symmetry A, which here has a threefold symmetry.
  • This symmetry relates in particular to the number and arrangement of the arms of the expansion element SE or the feet F of the contact pin KS.
  • the arms of the expansion element and the feet are alternately offset from each other and are guided by spaced openings of the intermediate piece ZS- Between the openings, the intermediate piece ZS preferably concludes positively with the inner cup wall BW.
  • the contact pin KS is preferably fitted in a recess of the intermediate piece, which thus has a smaller thickness in the interior than between the openings.
  • FIG. 3 shows an exploded perspective view of a contact pin KS with feet F, an intermediate piece ZS and connected to a spreader SE varistor V. From the figure it is clear that varistor and spreader form a preferably connected by a solder joint LV unit, as well as contact pin KS and the with this connected via a solder joint LV feet.
  • the plate shape of the basic shape formed intermediate piece has openings in the edge region through which the feet F and the arms of the expansion element SE can be pushed through from different sides.
  • FIG. 4 shows in a perspective view the three in FIG. 3 shown components in assembled form, as they are arranged in the finished protective element. From this representation, it is clear that the intermediate piece ZS is used for electrical insulation between the contact pin and the varistor, or for electrical insulation of the feet F against the arms of the expansion element SE. The feet F are also spaced from the varistor, as are the arms of the expansion element SE from the contact pin.
  • FIG. 5 shows in a perspective plan view, as the in FIG. 4 represented part in the cup B is fitted form-fitting. From the figure it is clear that the intermediate piece ZS concludes positively with the cup B. It is also clear that the arms of the expansion element SE are braced against the cup wall and thus establish an electrical contact to this.
  • the invention has been explained by way of example only, it is not limited to this. Since it essentially represents the arrangement and interconnection of varistor and contact pin by means of electrically insulating intermediate piece, feet and spreading element, the exact design of the surge arrester UA and the varistor V for the invention without meaning. It is only important that the varistor is disc-shaped, wherein the upper and lower major surface are metallized and thus represent upper and lower electrode. Such a varistor has a low capacitance and allows the use of the protective element in high-frequency systems, in particular for high-frequency communication systems such as ADSL, VDSL, etc. The invention is characterized by the low space requirements, the simple structure and secure cohesion on the specific geometric design out. Further possible variations of the invention result from the selection of different types of surge arresters, different materials for the individual components as well as a deviating from the illustrated spatial configuration geometric design.

Abstract

L'invention concerne un élément de protection, connu en soi, utilisé pour dériver de manière fiable des surtensions, qui comprend un montage en parallèle regroupant une varistance et un limiteur de tension. Afin de réduire la capacité de l'élément de protection, la varistance se présente sous forme de disque et est disposée entre une broche de contact (KS) et le limiteur de surtension. Une isolation électrique prévue entre la broche de contact et la varistance est assurée par une pièce intermédiaire à effet isolant électrique, dans laquelle sont pratiquées des ouvertures pour des éléments de contact électriques pour raccorder la varistance au boîtier, et la broche de contact au limiteur de surtension. Ledit limiteur de surtension et la pièce intermédiaire sont montés dans le boîtier, de préférence par liaison de forme.

Claims (13)

  1. Élément de protection pour dériver des surtensions, comprenant un godet (B) électriquement conducteur dans lequel une varistance (V) et un parasurtenseur (UA) sont disposés l'un au-dessus de l'autre et sont branchés électriquement en parallèle entre le godet et une broche de contact (KS),
    dans lequel la varistance repose directement avec son électrode inférieure sur une première électrode (E1) du parasurtenseur,
    dans lequel la broche de contact est en contact avec la première électrode du parasurtenseur,
    dans lequel la deuxième électrode (E2) du parasurtenseur repose sur le fond (BB) du godet, comprenant une liaison électrique (EV) de l'électrode supérieure de la varistance avec le godet, caractérisé en ce que
    un élément intermédiaire (ZS) électriquement isolant est disposé entre la varistance et la broche de contact,
    la varistance est réalisée sous la forme d'un disque et présente un diamètre plus petit que le parasurtenseur, et
    la broche de contact est disposée au moins partiellement dans l'espace entre le godet et la varistance.
  2. Élément selon la revendication 1, dans lequel l'électrode supérieure de la varistance (V) est reliée avec un élément extensible (SE) qui présente au moins deux bras, lesquels sont écartés dans le godet (B) et servent de liaison électrique avec le godet.
  3. Élément selon la revendication 1 ou 2, dans lequel la broche de contact (KS) présente au moins deux pieds (F) qui passent latéralement à côté de la varistance (V).
  4. Élément selon la revendication 2 ou 3, dans lequel l'élément intermédiaire (ZS) est adapté au diamètre intérieur du godet (B) et présente des ouvertures séparées les unes des autres pour les pieds (F) de la broche de contact (KS) ou pour les pieds de la broche de contact et les bras de l'élément extensible (SE).
  5. Élément selon l'une des revendications 1 à 4, dans lequel l'élément intermédiaire (ZS) présente au centre un enfoncement dans lequel la broche de contact (KS) est partiellement immergée.
  6. Élément selon l'une des revendications 1 à 4, dans lequel l'élément intermédiaire (ZS) présente au centre un enfoncement dans lequel la varistance (V) est partiellement immergée.
  7. Élément selon l'une des revendications 1 à 6, dans lequel la varistance (V), le parasurtenseur (UA) et le godet (B) sont configurés avec symétrie rotationnelle, dans lequel la broche de contact (KS), l'élément intermédiaire (ZS), la varistance (V) et le parasurtenseur (UA) sont disposés de manière coaxiale et concentrique par rapport à l'axe central (A) du godet.
  8. Élément selon l'une des revendications précédentes, dans lequel la section transversale du godet (B) présente dans la zone du parasurtenseur (UA) un élargissement (ST) à la manière d'une marche, de sorte que le godet est espacé du parasurtenseur dans la zone de la première électrode (E1) de celui-ci.
  9. Élément selon l'une des revendications précédentes, dans lequel le godet (B) et la broche de contact (KS) sont réalisés en laiton.
  10. Élément selon l'une des revendications précédentes, dans lequel l'élément intermédiaire (ZS) est réalisé en caoutchouc ou en silicone.
  11. Élément selon l'une des revendications précédentes, dans lequel la tension d'amorçage de la varistance (V) est choisie de telle sorte qu'elle est supérieure à la tension d'amorçage du parasurtenseur (UA).
  12. Utilisation de l'élément selon l'une des revendications précédentes pour protéger des équipements de télécommunication.
  13. Utilisation de l'élément selon l'une des revendications précédentes pour protéger des sous-ensembles dans des systèmes de télécommunication à haute fréquence.
EP03787688A 2002-07-19 2003-07-18 Element de protection pour deriver des surtensions et utilisation correspondante Expired - Fee Related EP1523792B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US39743802P 2002-07-19 2002-07-19
US397438P 2002-07-19
PCT/DE2003/002433 WO2004017479A1 (fr) 2002-07-19 2003-07-18 Element de protection pour deriver des surtensions et utilisation correspondante

Publications (2)

Publication Number Publication Date
EP1523792A1 EP1523792A1 (fr) 2005-04-20
EP1523792B1 true EP1523792B1 (fr) 2011-05-11

Family

ID=31888188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03787688A Expired - Fee Related EP1523792B1 (fr) 2002-07-19 2003-07-18 Element de protection pour deriver des surtensions et utilisation correspondante

Country Status (5)

Country Link
US (1) US6952336B2 (fr)
EP (1) EP1523792B1 (fr)
JP (1) JP4299244B2 (fr)
CN (1) CN100446363C (fr)
WO (1) WO2004017479A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005016848A1 (de) * 2005-04-12 2006-10-19 Epcos Ag Überspannungsableiter
DE102005036265A1 (de) * 2005-08-02 2007-02-08 Epcos Ag Funkenstrecke
DE102008029094A1 (de) * 2007-06-21 2009-01-02 Epcos Ag Vorrichtung und Modul zum Schutz vor Blitzen und Überspannungen
US8199450B2 (en) * 2009-05-05 2012-06-12 Samsung Electronics Co., Ltd. ESD protection utilizing radiated thermal relief
PL2287984T3 (pl) * 2009-07-20 2012-02-29 Bettermann Obo Gmbh & Co Kg Ochronnik przepięciowy
EP3703203A1 (fr) * 2013-02-22 2020-09-02 Bourns Incorporated Dispositif plan de tube à décharge dans un gaz et son procédé de fabrication
CN108701570B (zh) * 2016-02-15 2020-06-30 东莞令特电子有限公司 热金属氧化物变阻器电路保护装置
DE102017118181B4 (de) * 2017-07-07 2019-01-17 Dehn + Söhne Gmbh + Co. Kg Gekapselte Überspannungsschutzvorrichtung mit einem becherartigen Gehäuse

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
DE2355421B2 (de) 1973-11-06 1977-08-04 Ueberspannungsschutzeinrichtung
US4288833A (en) * 1979-12-17 1981-09-08 General Electric Company Lightning arrestor
US4396970A (en) * 1981-01-12 1983-08-02 Tii Industries Inc. Overvoltage surge arrester with predetermined creepage path
US4803588A (en) * 1986-04-14 1989-02-07 Cooper Industries, Inc. Surge arrester
JP2513105B2 (ja) * 1992-03-31 1996-07-03 三菱マテリアル株式会社 サ―ジアブソ―バ
DE4331215B4 (de) * 1992-09-28 2005-02-10 Epcos Ag Baugruppe zur Ableitung elektrischer Überspannungen
DE9321370U1 (de) * 1992-09-28 1997-09-18 Siemens Ag Baugruppe zur Ableitung elektrischer Überspannungen
DE19622140A1 (de) * 1996-06-01 1997-12-04 Asea Brown Boveri Überspannungsableiter
DE19856939A1 (de) 1998-12-10 2000-06-15 Bettermann Obo Gmbh & Co Kg Schaltungsanordnung zum Schutz von elektrischen Installationen gegen Überspannungsereignisse
CN2468137Y (zh) * 2000-06-16 2001-12-26 武汉博大科技集团随州避雷器有限公司 复合外套有串联间隙金属氧化物避雷器

Also Published As

Publication number Publication date
US20040066599A1 (en) 2004-04-08
JP2005533361A (ja) 2005-11-04
WO2004017479A1 (fr) 2004-02-26
CN100446363C (zh) 2008-12-24
JP4299244B2 (ja) 2009-07-22
US6952336B2 (en) 2005-10-04
EP1523792A1 (fr) 2005-04-20
CN1669195A (zh) 2005-09-14

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