EP2188876A1 - Schadensbegrenzende schalteinrichtung für überspannungsableiter wie varistoren, funkenstrecken oder dergleichen mittel - Google Patents
Schadensbegrenzende schalteinrichtung für überspannungsableiter wie varistoren, funkenstrecken oder dergleichen mittelInfo
- Publication number
- EP2188876A1 EP2188876A1 EP08803906A EP08803906A EP2188876A1 EP 2188876 A1 EP2188876 A1 EP 2188876A1 EP 08803906 A EP08803906 A EP 08803906A EP 08803906 A EP08803906 A EP 08803906A EP 2188876 A1 EP2188876 A1 EP 2188876A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switching device
- varistor
- surge arrester
- switching
- fixing device
- 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.)
- Granted
Links
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
-
- 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
- Damage limiting switching device for surge arresters such as varistors, spark gaps or the like means
- the invention relates to a damage-limiting switching device for surge arresters such as varistors, spark gaps or the like means comprising a movable, conductive or conductive portions having switching element which is held under mechanical bias standing by a fixing device, wherein the fixing device releases the switching element when heated, so in that this bridges the surge arrester connection contacts, connects or disconnects at least one of the connection contacts, according to the preamble of patent claim 1.
- Overvoltage arresters based on varistors generally have an internal disconnecting device in the low-voltage range.
- This internal separating device usually consists of a combination of a thermal separating device and a predetermined breaking point or predetermined breaking point for high currents.
- a predetermined breaking point can be formed as a defined constriction of the connection cross section of the varistor and has a certain melting integral value (I 2 t value). With high pulse currents to be derived, this bottleneck melts. The movable connector is then disconnected and removed from the varistor as a result of bias and thereby isolated from the mains.
- Such separation devices are shown for example in DE 42 41 311 Al or in DE 38 05 889 Al.
- the thermal separation function is often realized in these prior art documents by a solder connection between the varistor and a movable, spring-loaded connector.
- DE 36 06 287 A1 shows a surge arrester with varistors, which is encapsulated with its associated overcurrent or over-temperature protection devices in a common block of a thermally insulating material.
- a gradual heating of a varistor usually speaks the thermal separation device after several seconds.
- the core element of such a thermal separation device is usually a solder, which melts, whereby the spring force separating device opens.
- the varistor has in this case of error still a very high resistance, whereby the current through the varistor is severely limited.
- the disconnect device is generally capable of easily interrupting these currents, thereby disconnecting the overloaded arrester from the mains without the need for or requiring further overcurrent protection.
- the power supply to the consumer is not interrupted or disturbed. All that needs to be done is to replace the defective surge arrester during maintenance.
- the thermal disconnecting device can lead to a delayed disconnection or the melt integral value of the bottleneck is reached, causing it to melt and safely separate the trap from the grid.
- the object of the invention is achieved by a damage-limiting switching device for Studentsnapssabieiter as varistors, Fu nkenumblen or the like means according to the combination of features according to claim 1 and a method to m operate such a switching device according to the teaching of claim 15, wherein the dependent claims at least expedient embodiments and represent further education.
- the operating principle is in the tripped state a short-circuit path in a parallel path to the defective To switch arrester, so that the original current commutated as a short-circuit current in the parallel path.
- the Kurzsch conductedeinrichtu ng has the least possible delay time, so that an unwanted destruction of the surge arrester can be avoided or the damage due to arcing can be limited.
- surge arrester z. B. particular varistors
- the material structure, the geometry and the contacting of the pads and the power distribution areas have different heating.
- the point or the region of the strongest heating is to be selected for the positioning of a thermally sensitive part, in particular the fixing device according to the invention.
- the fixing device, d. H. the thermally sensitive part will also have the lowest possible heat capacity and have a low heat dissipation.
- a thermally sensitive part is attached as a fixing device on the area of the most intense heating varistor.
- the fixing device itself has a low heat capacity.
- Waxes, adhesives, solders or suitable materials having a melting point or a softening temperature just above the usual operating temperature of the surge arrester are suitable for connection to the surge arrester. These materials then either directly or in connection with spacers hold the actually movable part of the short-circuiting device or the separating device.
- the switching device according to the invention which is designed, for example, as a short-circuiting device, in a region of an additional housing of the surge arrester, this enclosure collecting or bundling temperature and / or gas effects of the arc in the event of an arcing , That is, the resulting Hot gas, which is present in the event of damage, is conducted predominantly and directly to the fixing device and to the thermally sensitive area provided there.
- this can be realized by completely enclosing the surge arrester with the exception of the region of contact of the temperature-sensitive material.
- the hot gas or plasma can be guided to a chimney-like channel, in which z. B. a wire or a thread of the fixing is located or receives a part of a surge arrester.
- the pressure development for the short circuit can additionally be used.
- the pressure acts, z. B. in the form of a piston system, d irect on the short-circuit contact.
- the mechanical strength of the holding system (contact point and strength of the wire) is already overloaded at relatively low pressures.
- the surge arrester connection extending into the channel or located there has a low erosion resistance. Furthermore, the surge arrester connection that reaches into the channel or is located there may be a bottleneck, for B. formed as a geometric bottleneck own.
- the further surge arrester connection is designed so that it burns off and is predominantly located inside the erosion-resistant and pressure-resistant housing.
- the overvoltage arrester is provided with a separate, erosion-resistant encapsulation for operating the switching device, in order to collect waste heat resulting from the resulting arc in the event of damage, the collected thermal energy ie concentrated being supplied to a switching element in the form of the abovementioned disconnecting device or a short-circuiting device for actuating same ,
- the surge arrester in particular the varistor, is encapsulated separately in such a way that the resulting waste heat of the arc and / or burnup due to the arc for the operation of the separating device or the short-circuiter is available.
- an arc arises in the immediate vicinity of the varistor, which is known to be connected to a hot plasma.
- This arc causes a burn on the connection elements, eg. B. metallic contact plates or the leads to the varistor.
- a varistor is almost completely surrounded by an erosion-resistant and pressure-resistant housing or partition.
- the varistor connections are developed differently.
- a first varistor connection is predominantly provided with additional insulation, as a result of which a foot point or an extension of the arc into this area can be largely prevented.
- the related Varistoran gleichblech can be reinforced or deposited with a separate, additional, contacted or not contacted, preferably erosion-resistant material. As a result, it is avoided, as stated, that the arc can spread uncontrollably into this connection region.
- the other, usually opposite port, however, is minimal or not isolated at all and leads directly to the separation device.
- the enclosure has immediately around this further connection a recess or a channel that is designed like a fireplace. This causes the arc to find a footing in this area unhindered. The resulting hot gas does not become that isolated connection and thus directed to the separation device.
- the arrangement is designed so that the current forces drive the arc in the direction of this connection.
- This second switching element may consist of two at least one side conductive plates, wherein the conductive plate sides are opposite.
- the conductive plates are arranged so that they are fixed while maintaining a separation distance, wherein the desired switching function, in particular a short circuit can be triggered by pressure on at least one of the plates while overcoming the separation distance.
- a disc-shaped, encapsulated varistor is used, in particular, as the surge arrester, the plate arrangement being arranged adjacent to the varistor in such a way that an overload-related expansion targeted by the encapsulation acts on the plate arrangement in order to effect the switching operation.
- the aim is to provide an additional protection device in addition to the conventional thermal separation device, which ensures at high overloads, in which the thermal separation device can not protect the varistor from destruction, for defined and uncritical conditions.
- the thermal separation device can not protect the varistor from destruction, for defined and uncritical conditions.
- FIG. 1 shows an exemplary embodiment in which a surge arrester in the form of a varistor is provided with an additional housing and wherein the fixing device is located in an area in which, in the event of an emerging arc, temperature and / or gas effects of the arc are collected or concentrated,
- FIG. 2 shows an embodiment of a chambered varistor with a chimney-type channel, wherein the separating device is located in the region of the outflow of the chimney-like channel,
- Fig. 3 is a schematic diagram of the second embodiment of the invention with a pressure-operated switching device
- Fig. 4 is an exploded view of a practical Realisieru ng the pressure-operated switching device
- Fig. 5 is a plug-in module which contains an encapsulated varistor as Studentsnapssabieiter, and (left side shown) a plate assembly as a second, pressure-actuated switching element and
- Fig. 6 the inserted in the plug-in module plate assembly in a representation with not yet deferred cap.
- the switching element is designed as a short-circuiting.
- the short-circuiting device comprises a movable contact piece 1 and two separate opposing contact pieces 2.
- the short-circuit release movement is symbolized by the arrow representations with regard to the movable contact piece 1.
- the movable contact piece 1 can be formed as a lid, wherein a bellows 3 can be provided, which closes the space below the lid designed as a movable contact piece 1 almost tight.
- the lid is then, as it were, slipped over a chimney 4 with lateral overhangs and a piston is created which reacts to the pressure effect of the arc 5.
- the wire 6 does not have to be formed as an electrode. However, it is of advantage that the wire 6 is subject to a potential if necessary, so as to represent a lucrative way for the arc, so that the wire can be burned by the action of arcing and thus releases the actual short-circuiter.
- the wire is not necessarily to be regarded as a power supply to the varistor and is also not in the main current path.
- a first varistor connection 7 is connected to a wear-resistant contact plate 8.
- a second varistor terminal 9 leads to the opposite pole contact piece 2.
- the reference numeral 10 symbolizes the arrangement of the temperature-sensitive material for fastening the wire 6.
- a flameproof and Abbrandfeste housing 12 is formed, which leads to the aforementioned fireplace 4.
- the waste heat collected in the chimney 4 is not used for actuating a short-circuiting device but for triggering a disconnecting device 13. Also in this embodiment, a housing 12 is provided which surrounds the varistor 11 erosion and pressure-tight.
- the first varistor terminal 7 is also there with a erosion-resistant contact plate 8 in connection.
- the second varistor terminal 9 is not or only slightly insulated and leads directly to the separation device 13.
- the housing 12 of the varistor 11 leads to the recess or the chimney 4, so that the arc 5 can find a foot in this area unhindered.
- the entire hot gas 14, which arises within the enclosure 12, is conducted to the second varistor connection 9 and thus to the separation device 13.
- the arrangement is designed so that the current forces the arc 5 in the direction of the connec 9 drive.
- the first varistor terminal 7 is provided with additional insulation, so that a foot point or an extension of the arc into this area can be largely prevented. This prevents that the housing 12 of the varistor 11 is destroyed in this area. For this reason, the Varistoran gleichblech can be reinforced by the abbrandfeste contact plate mentioned. It is also possible to make a deposit here with a erosion-resistant material. This also ensures that the arc 5 can not spread uncontrollably in this area.
- the varistor can be provided with a defined weak point or substrate defect, which leads to a preferred point of breakdown or flashover.
- the Varistoran gleichblech but can also provide preferred attachment points for the arc, which are due to the current forces, the insulation or the electric field strength used.
- the design of the connection section makes it possible to form the heat distribution and / or the current distribution of the varistor be that a preferred way for the breakdown of the varistor is formed.
- the energy that arises in the event of damage in the area around the varistor 11 thus specifically supports the function of the separation device 13.
- the heat is thus the bottleneck 15 of the separation device, but also not shown Lotstelle the separation device 13 available, whereby their melting is accelerated ,
- Both the movable part of the separating device and the fixed Varistoran gleich 9 can be made of bimetal or materials with similar effects, whereby when heated an additional force for separation is available.
- the constriction 15 of the separation strip was integrated directly into the varistor connection 9 and moved into the chimney 4 of the housing.
- the direct arc erosion for the separation of the bottleneck can be used in a very effective manner.
- This measure can also be supported by making the bottleneck area attractive for the choice of material, the geometry or a passivation of other areas for the arc filling point.
- the housing also causes a limitation of the damage within the arrester 11th
- the varistor is encapsulated so pressure and erosion resistant that the resulting heat in case of failure can act directly on the separation device, a short-circuit device and / or a telecommunications contact.
- the encapsulation has a chimney-like recess into which parts of the separating device or the fixing device extend.
- the varistor has a connection which is designed erosion-resistant, wherein on the opposite side relative to this connection, the separating device or the fixing device is located.
- the varistor has a terminal, which has an extremely low erosion resistance to the arc. This connection is made at or near the separator or is part of it.
- the erosion-resistant and pressure-resistant casing of the arrester is capable of directing the arc root point to the bottleneck and / or to the thermal separation point of the separating device.
- the aforementioned constriction is located either in the movable conductor piece of the separation device or directly in the connected via a Lotstelle with the separating device connecting part of the arrester.
- a second, the Matternapsabieiter parallel lying switching element is additionally provided, which is activated by pressure actuation.
- FIG. 3 a series connection of a varistor 11 is shown with a thermally coupled separation device.
- the varistor 11 is located in a special encapsulation 16.
- This encapsulation 16 can extend in a preferred direction under pressure P.
- the terminals of the varistor 11 lead to a second switching element 17, in such a way that upon actuation of the second switching element 17 of the varistor 11 bridges, d. H. shorted.
- the realized with the second switching element 17 short-circuiter is actuated via the pressure P.
- the encapsulation 16 of the varistor 11 is, as already indicated, designed so that at a pressure build-up primarily an actuation of the switch or the second switching element 17 can be carried out.
- a conventional disc-shaped varistor 11 has two terminals I Ia and I Ib. These terminals I Ia and I Ib are preferably designed as terminal lugs.
- the varistor 11 is installed in a base body 18 of a male part in a conventional manner.
- FIG. 4 is formed on the back of the varistor 11, the already described thermal separation device.
- the disc-shaped varistor 11 is laterally enclosed by a sealing frame 19 and closed by a flexible or flexible sealing plate 20 on the front side.
- the second switching element 17 is in the embodiment of FIGS. 4 to 6 formed by a pressure-controlled switch.
- This pressure-controlled switch comprises a first conductive plate 21 and a second conductive plate 22.
- an insulating frame 24 is located, which keeps the opposite plate surfaces at a distance corresponding to the gewü desired separation distance.
- the sealing plate 20 expands, d. H. There is a bulge here. Result of this bulge or deflection is then a reduction in the distance between the conductive plates 21 and 22, until they finally come into contact, where by the desired switching operation (short circuit) is triggered.
- the distance between the conductive plates 21 and 22 is chosen so large that at the maximum allowable load (permissible operating voltage or maximum permissible pulse current load of the varistor) no automatic discharge between the plates.
- the plate 21 is designed as a thin, flexible plate. Due to the short-circuit, which is generated in the event of overload with the aid of the two plates 21 and 22, an arc produced in the enclosure is extinguished and a possible external damage is prevented. The resulting short-circuit current is interrupted either by an upstream overcurrent protection device of the varistor or the network or else by the mentioned thermal separation device of the varistor.
- the plates 21 and 22 can also be embodied as a conductive foil or a foil coated on one side. It is also possible to combine the flexible pressure plate 20 with the conductive plate 21 as a conductive foil. With sufficient protective insulation of the varistor 11, the flexible sealing plate 20, which acts as an insulating part, may also be dispensed with. Likewise, a compact design of the modules 19, 20 and 21 in the sense of a one-piece part is possible if it is ensured sufficient insulation.
- FIG. 5 illustrates how the varistor with encapsulation comprising the parts 19 and 20 was mounted in the base body 18.
- the parts 21, 22 and 24 form a likewise prefabricatable assembly, namely the second switching element 17.
- This prefabricated assembly is then inserted into the base body 18.
- the result is the assembly as shown in FIG. 6, which is subsequently completed with a protective cap 25, so that a finished plug-in module is formed.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuses (AREA)
- Emergency Protection Circuit Devices (AREA)
- Thermally Actuated Switches (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Transmitters (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL08803906T PL2188876T3 (pl) | 2007-09-10 | 2008-09-09 | Urządzenie przełączające ograniczające uszkodzenia |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007042989A DE102007042989A1 (de) | 2007-05-29 | 2007-09-10 | Kurzschließeinrichtung für Überspannungsableiter |
DE102008038963A DE102008038963A1 (de) | 2008-08-13 | 2008-08-13 | Schadensbegrenzende Schalteinrichtung für Überspannungsableiter wie Varistoren, Funkenstrecken oder dergleichen Mittel |
PCT/EP2008/061938 WO2009034081A1 (de) | 2007-09-10 | 2008-09-09 | Schadensbegrenzende schalteinrichtung für überspannungsableiter wie varistoren, funkenstrecken oder dergleichen mittel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2188876A1 true EP2188876A1 (de) | 2010-05-26 |
EP2188876B1 EP2188876B1 (de) | 2012-03-07 |
Family
ID=40085666
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08803906A Not-in-force EP2188876B1 (de) | 2007-09-10 | 2008-09-09 | Schadensbegrenzende schalteinrichtung |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2188876B1 (de) |
CN (1) | CN101836340B (de) |
AT (1) | ATE548786T1 (de) |
DE (1) | DE102008038963A1 (de) |
PL (1) | PL2188876T3 (de) |
RU (1) | RU2010110463A (de) |
WO (1) | WO2009034081A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009048045B4 (de) * | 2009-10-02 | 2011-06-01 | Phoenix Contact Gmbh & Co. Kg | Überspannungsschutzelement |
DE102011001977C5 (de) | 2011-04-12 | 2015-12-03 | Phoenix Contact Gmbh & Co. Kg | Zweistufige Abschaltvorrichtung für einen Varistor |
DE102012002962A1 (de) * | 2012-02-16 | 2013-08-22 | Phoenix Contact Gmbh & Co. Kg | Kurzschließeinrichtung zum Sach- und Personenschutz in elektrischen Systemen |
DE202014002496U1 (de) * | 2014-03-20 | 2014-04-17 | Dehn + Söhne Gmbh + Co. Kg | Überspannungsschutzeinrichtung, umfassend mindestens einen Überspannungsableiter und eine dem Überspannungsableiter parallel geschaltete, thermisch auslösbare, federvorgespannte Kurzschliessschalteinrichtung |
CN107078467B (zh) * | 2014-09-05 | 2019-03-01 | 德恩及索恩两合股份有限公司 | 用于在存在暂态过压时使电涌放电器电网分离的布置系统 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2634479A1 (de) * | 1976-07-31 | 1978-02-02 | Schiederwerk Schieder Kg K | Varistor mit schutzvorrichtung gegen thermische ueberlastung |
DE3318588A1 (de) * | 1983-05-21 | 1984-11-22 | Brown, Boveri & Cie Ag, 6800 Mannheim | Varistorsicherungselement |
DE3606287A1 (de) | 1986-02-27 | 1987-09-03 | Dehn & Soehne | Ueberspannungsschutzanordnung |
DE3632224A1 (de) | 1986-09-23 | 1988-04-07 | Bettermann Obo Ohg | Vorrichtung zur ueberwachung von in einen stromkreis integrierten varistoren |
DE3734214A1 (de) | 1987-10-09 | 1989-04-20 | Dehn & Soehne | Anordnung zur abschaltung eines varistors |
DE3805890C2 (de) | 1987-10-24 | 1995-11-23 | Bettermann Obo Ohg | Vorrichtung zur Funktionsüberwachung von Überspannungsableitern |
JPH03252074A (ja) * | 1990-03-01 | 1991-11-11 | Mitsubishi Electric Corp | 電気機器の切り離し装置 |
DE4241311C2 (de) | 1992-12-08 | 1995-06-08 | Phoenix Contact Gmbh & Co | Temperaturschalter mit einem Bausteingehäuse |
FR2756673B1 (fr) * | 1996-11-29 | 2003-05-30 | Soule Materiel Electr | Dispositif de protection pour lignes telephoniques |
US6304166B1 (en) * | 1999-09-22 | 2001-10-16 | Harris Ireland Development Company, Ltd. | Low profile mount for metal oxide varistor package and method |
-
2008
- 2008-08-13 DE DE102008038963A patent/DE102008038963A1/de not_active Withdrawn
- 2008-09-09 PL PL08803906T patent/PL2188876T3/pl unknown
- 2008-09-09 EP EP08803906A patent/EP2188876B1/de not_active Not-in-force
- 2008-09-09 CN CN200880112569.XA patent/CN101836340B/zh not_active Expired - Fee Related
- 2008-09-09 AT AT08803906T patent/ATE548786T1/de active
- 2008-09-09 WO PCT/EP2008/061938 patent/WO2009034081A1/de active Application Filing
- 2008-09-09 RU RU2010110463/07A patent/RU2010110463A/ru not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2009034081A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102008038963A1 (de) | 2010-02-18 |
WO2009034081A1 (de) | 2009-03-19 |
PL2188876T3 (pl) | 2012-08-31 |
CN101836340A (zh) | 2010-09-15 |
RU2010110463A (ru) | 2011-10-20 |
ATE548786T1 (de) | 2012-03-15 |
CN101836340B (zh) | 2014-04-02 |
EP2188876B1 (de) | 2012-03-07 |
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