WO1987006399A1 - Dispositif pour proteger un coupe-circuit de surtension contre une surchage thermique - Google Patents

Dispositif pour proteger un coupe-circuit de surtension contre une surchage thermique Download PDF

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Publication number
WO1987006399A1
WO1987006399A1 PCT/EP1987/000194 EP8700194W WO8706399A1 WO 1987006399 A1 WO1987006399 A1 WO 1987006399A1 EP 8700194 W EP8700194 W EP 8700194W WO 8706399 A1 WO8706399 A1 WO 8706399A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact element
arrester
surge arrester
ground electrode
electrodes
Prior art date
Application number
PCT/EP1987/000194
Other languages
German (de)
English (en)
Inventor
Gerhard Keller
Original Assignee
Schaltbau Gesellschaft Mbh
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 Schaltbau Gesellschaft Mbh filed Critical Schaltbau Gesellschaft Mbh
Publication of WO1987006399A1 publication Critical patent/WO1987006399A1/fr
Priority to NO875120A priority Critical patent/NO875120D0/no

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Classifications

    • 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

Definitions

  • the present invention relates to a device for protecting a surge arrester against thermal overload according to the respective preamble of claims 1, 3 and 6.
  • Surge arresters which are used in the field of telecommunications are generally designed as so-called two-section surge arresters, which have an essentially ring-shaped, essentially ring-shaped ground electrode and a voltage electrode spaced from the ground electrode. Gas spark gaps between the voltage electrodes and the ground electrode are used to derive the overvoltage. In the event of an overvoltage, an arc arises in the gas spark gap in each case, which can lead to the overvoltage arrester heating up and ultimately to thermal destruction of the overvoltage arrester and the overvoltage arrester magazine receiving it.
  • the contact elements of the known device for protecting the surge arrester against thermal overload can indeed be used as retrofit protective elements in already existing magazines with surge arresters for their thermal protection, but have the disadvantage that the S- or L-shaped structure of the contact elements is relative is bulky to ensure the necessary contact pressure after melting the solder pill and passing through the contact path. Furthermore, the S- or L-shaped contact elements of the known device for the thermal protection of surge arresters are clamped between the surge arresters and their magazines, which results in a relatively complex assembly of the contact elements. In addition, the assembly of the contact elements in the magazines on the surge arresters is relatively complex because of the contact elements which are already strongly pre-stressed in the cold state.
  • the object of the present invention is to provide a Direction to protect a surge arrester of the type mentioned in such a way that with a compact design of the device for protecting the surge arrester, a simple assembly of the device is achieved.
  • the clip in a device of the type mentioned at the outset for protecting an overvoltage arrester against thermal overload, the clip consists of two layers of thermobimetal, one above the other and at least partially in contact with the overvoltage arrester, which are arranged with respect to the overvoltage arrester are that when the overvoltage arrester is heated, the inner layer tends to stand out from the latter and the outer layer tends to lie against the latter, the layers of the clamp at their free end being in engagement with one another with a monostable snap element which, when heated to a certain extent the layers come out of engagement and do not engage again even when the layers cool, the clip bridging the electrodes when the snap element is engaged.
  • This solution according to the invention offers the advantage that even after the device for thermal protection has responded, it is ready for operation again Can be brought into a state in which the monostable snap element is in turn engaged by hand or by means of a tool.
  • the surge arrester is a two-way arrester which consists of two surge arresters connected to one another with a common ground electrode and two spaced voltage electrodes, in which the device for thermal protection is designed in such a way that the clamp on the two-way arrester is arranged at the level of the ground electrode and only connected to it in an electrically conductive manner and consists of a thermal bimetallic strip bent up to 180 ° and placed around the surge arrester, so that the inner position adjacent to the surge arrester is at its location free end has a nose bent out against the outer layer, that the outer layer has at its free end both an elongated recess, which together with the nose forms the snap element, the edge of which is directed toward the free end and has a bulge outwards that are so dimensio niert is that with a certain heating of the layers, the free end of the inner layer can pass through this recess, as well as is provided on both sides with widening which in passing through the free end of the inner layer through
  • This configuration of the device according to the invention for the thermal protection of the double-line surge arrester can be achieved with little effort from a suitably punched and bent thermistor. Produce mobile metal strips and can be pushed onto the two-way surge arrester without further holding devices.
  • the contact element consists of a thermobimetal strip
  • the contact element is designed in such a way that it essentially follows a jacket surface surrounding the essentially cylindrical two-section surge arrester, that the contact element has two arms extending circumferentially around the ground electrode and one in the axial direction from one voltage electrode to the other Has voltage electrode extending longitudinal section, and that the longitudinal section of the contact element is spaced from the two-way surge arrester by the spacer which softens in the event of inadmissible heating of the two-way surge arrester.
  • the spacer consists of a thermoplastic or a metal alloy that melts at a relatively low temperature.
  • the ends of the arms are provided with beads which, after the spacer part has softened, come into contact with the voltage electrodes. In this way, contact is achieved even if the spacer cannot be flattened completely.
  • the contact element in a device for protecting an overvoltage arrester against thermal overloading of the type mentioned at the outset, consists of a thermobimetal that it also bears against a guide link which is designed in such a way that the Contact element during its deformation due to the heating of the contact element in response to the heating of the overvoltage arrester on the guide link moved from a first to a second position, from which the contact element cannot return to the first position even after cooling, whereby the contact element in the second layer connects the electrodes to one another.
  • the contact element forms, together with the guide link, a monostable switching element which, after responding to excessive heating of the surge arrester, can also be brought back into the operational position using a tool or by hand.
  • the guide link has a step, via which the contact element moves on its way from the first position to the second position.
  • the contact element has arms which extend in the circumferential direction and a longitudinal section which extends in the axial direction of the surge arrester and bears against the guide link, the latter in the first position of the Voltage electrodes is spaced and is in the second layer on these.
  • the arms encompass the ground electrode in each case by approximately 180 °, the ends of the arms facing away from the longitudinal section tapering.
  • This configuration of the ends of the arms achieves a particularly suitable spring characteristic of the arms, with which the arms of the contact element can also easily be placed over the surge arrester.
  • FIG. 2 shows a clip for thermal protection of the surge arrester according to FIG. 1;
  • 3 and FIG. 4 are side views of the overvoltage arrester with a clamp in a first or second
  • FIGS. 1 to 4 shows a perspective illustration of the surge arrester provided with the clamp according to FIGS. 1 to 4;
  • Fig. 6 is a perspective view of a
  • FIG. 7 shows a side view of the surge arrester shown in FIG. 6 with a cross-sectional view of the contact element in its unactuated position
  • FIG. 8 shows a representation corresponding to FIG. 7, in which the contact element has assumed its actuated position
  • Fig. 10 is a representation corresponding to FIG. 9, in which the further contact element has assumed its actuated position.
  • 1 shows a double-line arrester 1, which consists of two surge arresters 2, 3 connected to one another. Between the overvoltage arresters 2, 3 there is a common, substantially annular ground electrode for both overvoltage arresters
  • a voltage electrode 5, 6 is assigned to each surge arrester 2, 3.
  • a clip 7 consisting of a thermal bimetallic strip is bent at its apex 8 by 180 °.
  • the bimetallic strip has a bore 9 through which a connection of the ground electrode 4 extends. Due to the mechanical tension of the bimetallic strip, it is connected to the connection of the ground electrode 4 in the region of the bore 9.
  • the at least two-layer thermobimetal strip has an inner layer 10 and an outer layer 12.
  • the inner layer At its free end facing away from the apex .8, the inner layer has a nose 11 which is bent out against the outer layer 12.
  • the outer layer 12 strives to bear against the surge arresters 2, 3. It has at its free end facing away from the apex 8 a recess 13, the edge of which is directed towards the free end and shows a bulge 14 towards the outside. Furthermore, the free end of the outer layer 12 has widenings 15, 16 which are connected to the voltage electrodes
  • FIG. 3 shows a side view of the overvoltage arrester with clip 7 attached, in its rest position, which is maintained, for example, up to a temperature of 140.degree.
  • the clip 7 plugged onto the double-track conductor 1 is only conductively connected to the ground electrode.
  • the inner layer 10 strives to stand out from the surge arresters 2, 3, while the outer layer 12 strives to contact the surge arresters 2, 3.
  • the nose 11 therefore moves under the bulge 14 in the direction of the recess 13.
  • the nose 11 with the free end of the inner layer 10 passes through the recess 13.
  • the outer layer 12 can therefore contact the surge arresters 2, 3 by the widenings 15, 16 making electrical contact with the voltage electrodes 5, 6 and thus short-circuiting the surge arresters 2, 3. This switching position results from FIGS. 4 and 5.
  • the clamp 7 can be returned with a tool guided between the bulge 14 and the nose 11 from the position shown in FIG. 4 to the position shown in FIG. 3 and brought into its operating state without this the clamp 7 must be removed from the two-section diverter 1.
  • identical reference symbols designate identical or similar parts.
  • Fig. 6 is a perspective view of the two-way arrester 1, which corresponds in structure to the two-way arrester shown in Fig. 1, with a perspective view of a contact element 17-
  • the contact element 17 is in its working position above the two-way arrester 1 and is only for reasons vividness separated from this. shown.
  • the contact element 17 consists of a bimetallic strip which essentially has the shape of a lateral surface enveloping the cylindrical double-line arrester 1.
  • the contact element 17 has two arms 18, 19 which extend around the ground electrode 4 in the circumferential direction and a longitudinal section 20 which extends in the axial direction from one voltage electrode 5 to the other voltage electrode 6.
  • the longitudinal section narrows starting from the arms 18, 19 to its bead-shaped ends 21, 22, which are provided for making contact with the voltage electrodes 5, 6.
  • the arms 18, 19 of the essentially jacket-shaped contact element 17 have tapering arm end sections 23, 24.
  • Each arm 18, 19 surrounds the two-section arrester 1 with a wrap angle of more than 180 ° in the region of the arm end sections 23, 24.
  • the contact element 17 is spaced in the middle of its longitudinal section 20 by a spacer part from the two-way arrester 1.
  • the spacer 25 consists of thermoplastic material or of a metal alloy that melts at a relatively low temperature. In this . Due to the spacing part 25 of the position of the contact element 17 spaced apart from the two-way arrester 1, its arm end sections 23, 24 are spaced apart from the voltage electrodes 5, 6.
  • the spacer softens and flattens out under the action of the force which the thermobimetal strip exerts on the spacer 25 when heated.
  • the layer sequence of the bimetallic strip of the contact element 17 is selected such that the contact element 17, when heated, pulls its arms 18, 19 towards the two-way arrester 1.
  • the flattened, softened spacer 25 ' enables contacting of the contact element 17 with the arm end sections 23, 24 on the voltage electrodes 5, 6 in order to connect them to the ground electrode 4 via the arms 18, 19.
  • the contact element 17 f likewise consists of thermal bimetal and, like the contact element 17 shown in FIGS. 7 and 8, has a longitudinal section 20 'and two arms 18', 19 '.
  • the contact element 17 ' also heats up via the heat conduction caused by the arms 18', 19 ', and deforms due to its thermobimetal structure in such a way that the support parts 27, 28 to move.
  • the arms 18 ', 19' increasingly pull the contact element 17 'against the two-way arrester 1.
  • the support parts 27, 28 snap over the step 29 in the link 26, whereupon the support parts 27, 28 or the longitudinal section 20' with the Contact voltage electrodes 5, 6. In this state, the voltage electrodes 5, 6 are conductively connected to the ground electrode 4.
  • the support parts 27, 28 strive to move apart again, but the support parts 27, 28 remain in position on the step 29 of the guide link 26.
  • the contact element 17 'thus remains in connection with the voltage electrodes 5, 6 and the ground electrode 4.
  • the support parts 27, 28 can be raised again to the step 29 of the guide link 26 by means of a tool, in order to make the two-way arrester 1 operational again to move.
  • the described embodiments of the device for protecting a surge arrester against thermal overload are designed symmetrically, since the shown embodiments of the surge arrester are designed as two-section surge arresters. However, asymmetrical configurations of the devices for protecting an overvoltage arrester can also be used above all if the overvoltage arrester is merely a one-way surge arrester.

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  • Fuses (AREA)

Abstract

Un dispositif (17) pour protéger un coupe-circuit de surtension (2, 3) contre une surcharge thermique comporte un bilame thermostatique et, après un échauffement inacceptable du coupe-circuit de surtension à protéger (2, 3), adopte une position de commutation monostable dans laquelle des électrodes (4, 5) du coupe-circuit de surtension sont reliées l'une à l'autre par l'élément de contact (17).
PCT/EP1987/000194 1986-04-09 1987-04-09 Dispositif pour proteger un coupe-circuit de surtension contre une surchage thermique WO1987006399A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NO875120A NO875120D0 (no) 1986-04-09 1987-12-08 Anordning for aa beskytte en overspenningsavleder mot termisk overbelastning.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3611889.3 1986-04-09
DE3611889 1986-04-09

Publications (1)

Publication Number Publication Date
WO1987006399A1 true WO1987006399A1 (fr) 1987-10-22

Family

ID=6298287

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1987/000194 WO1987006399A1 (fr) 1986-04-09 1987-04-09 Dispositif pour proteger un coupe-circuit de surtension contre une surchage thermique

Country Status (2)

Country Link
EP (1) EP0264409A1 (fr)
WO (1) WO1987006399A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998037605A1 (fr) * 1997-02-21 1998-08-27 Siemens Aktiengesellschaft Limiteur de surtension rempli de gaz et dote d'un court-circuiteur externe
WO2009095206A1 (fr) * 2008-01-31 2009-08-06 Epcos Ag Composant de protection électrique à dispositif de court-circuit
WO2015135731A1 (fr) * 2014-03-13 2015-09-17 Epcos Ag Parasurtenseur protégé contre l'échauffement
WO2016074909A1 (fr) * 2014-11-11 2016-05-19 Epcos Ag Parafoudre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE688881C (de) * 1938-06-29 1940-03-05 Siemens & Halske Akt Ges Schutzeinrichtung fuer UEberspannungsableiter
DE1018521B (de) * 1954-03-23 1957-10-31 Krone Kg Anordnung zum Schutz von Fernmeldeanlagen gegen direkte Starkstrombeeinflussung
DE2617463A1 (de) * 1976-04-21 1977-11-03 Ritz Messwandler Kg Stromwandler-kurzschliesser
EP0016242A1 (fr) * 1979-03-21 1980-10-01 Siemens Aktiengesellschaft Dérivateur de surtension à décharge dans un gaz à comportement sûr
EP0026861A1 (fr) * 1979-10-03 1981-04-15 Cerberus Ag Agencement de protection contre les surtensions
US4538201A (en) * 1983-05-02 1985-08-27 International Standard Electric Corporation Surge protector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE688881C (de) * 1938-06-29 1940-03-05 Siemens & Halske Akt Ges Schutzeinrichtung fuer UEberspannungsableiter
DE1018521B (de) * 1954-03-23 1957-10-31 Krone Kg Anordnung zum Schutz von Fernmeldeanlagen gegen direkte Starkstrombeeinflussung
DE2617463A1 (de) * 1976-04-21 1977-11-03 Ritz Messwandler Kg Stromwandler-kurzschliesser
EP0016242A1 (fr) * 1979-03-21 1980-10-01 Siemens Aktiengesellschaft Dérivateur de surtension à décharge dans un gaz à comportement sûr
EP0026861A1 (fr) * 1979-10-03 1981-04-15 Cerberus Ag Agencement de protection contre les surtensions
US4538201A (en) * 1983-05-02 1985-08-27 International Standard Electric Corporation Surge protector

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998037605A1 (fr) * 1997-02-21 1998-08-27 Siemens Aktiengesellschaft Limiteur de surtension rempli de gaz et dote d'un court-circuiteur externe
US6445560B1 (en) 1997-02-21 2002-09-03 Epcos Ag Gas-filled surge protector with external short-circuiting device
EP1821379A2 (fr) * 1997-02-21 2007-08-22 Epcos Ag Paratonnerre rempli de gaz doté d'un dispositif de court-circuit externe
EP1821379A3 (fr) * 1997-02-21 2007-11-07 Epcos Ag Paratonnerre rempli de gaz doté d'un dispositif de court-circuit externe
CN101983462A (zh) * 2008-01-31 2011-03-02 埃普科斯股份有限公司 具有短路装置的电保护构件
DE102008022794A1 (de) * 2008-01-31 2009-08-06 Epcos Ag Elektrisches Schutzbauelement mit Kurzschlusseinrichtung
WO2009095206A1 (fr) * 2008-01-31 2009-08-06 Epcos Ag Composant de protection électrique à dispositif de court-circuit
US8203819B2 (en) 2008-01-31 2012-06-19 Epcos Ag Electrical protection component with a short-circuiting device
WO2015135731A1 (fr) * 2014-03-13 2015-09-17 Epcos Ag Parasurtenseur protégé contre l'échauffement
DE102014103419B4 (de) 2014-03-13 2018-05-24 Epcos Ag Überspannungsableiter mit Schutz vor Erwärmung
US10148085B2 (en) 2014-03-13 2018-12-04 Epcos Ag Surge arrester having protection against heating
WO2016074909A1 (fr) * 2014-11-11 2016-05-19 Epcos Ag Parafoudre
CN107112724A (zh) * 2014-11-11 2017-08-29 埃普科斯股份有限公司 导体
US20170324221A1 (en) * 2014-11-11 2017-11-09 Epcos Ag Arrester
US10468855B2 (en) 2014-11-11 2019-11-05 Epcos Ag Arrester

Also Published As

Publication number Publication date
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