EP2212976A1 - Surge arrester having thermal overload protection - Google Patents
Surge arrester having thermal overload protectionInfo
- Publication number
- EP2212976A1 EP2212976A1 EP08852430A EP08852430A EP2212976A1 EP 2212976 A1 EP2212976 A1 EP 2212976A1 EP 08852430 A EP08852430 A EP 08852430A EP 08852430 A EP08852430 A EP 08852430A EP 2212976 A1 EP2212976 A1 EP 2212976A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- surge arrester
- electrode
- electrodes
- extinguishing device
- surge
- 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
- 238000002844 melting Methods 0.000 claims description 32
- 230000008018 melting Effects 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 16
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 230000001960 triggered effect Effects 0.000 claims description 8
- 239000006096 absorbing agent Substances 0.000 claims description 5
- 238000010891 electric arc Methods 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 10
- 229910000679 solder Inorganic materials 0.000 description 7
- 239000012212 insulator Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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
- 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
- H01T1/02—Means for extinguishing arc
Definitions
- the invention relates to a Studentsnapssabieiter with thermal overload protection and its use and a method for protecting a surge arrester before thermal overload.
- An object to be solved is to provide a thermal overload protection for a surge arrester and a method that safely and easily protect the surge arrester from thermal overload. Furthermore, a use must be specified.
- the surge arrester has at least two electrodes; it can be a two-electrode as well as a three-electrode surge arrester.
- the surge arrester forms an interior space by means of a tubular insulator, preferably a ceramic cylinder, and external electrodes or external connections arranged at its front ends.
- the at least two electrodes are soldered or welded to the external terminals and are typically opposite to each other as pin electrodes or as a tube electrode and Pen electrode, which projects into the tube electrode is formed.
- the interior of the surge arrester is gas-tight against the environment and contains a gas.
- Surge arresters serve in particular to short-circuit high pulse-shaped voltages of a few kV and currents of a few kA in a very short time or to discharge them to ground.
- a load that lasts longer in the event of a fault for example if a mains current is short-circuited via a power supply network or via a telecommunication network or a voltage distributor (power cross), may result in an excessively high heating of the surge arrester, which possibly leads to a fire.
- a surge arrester is thermally stressed under a load with DC or AC voltages or with DC or AC currents. This case can sometimes also occur in lightning protection applications.
- Surge arresters in the field of network protection serve to protect the network against lightning impulse currents and against overvoltages.
- arcing occurs when a certain threshold voltage is exceeded.
- the arc is maintained by the feeding current as long as the electrical conditions for the arc are met.
- the arc creates a thermal load on the surge arrester that must not exceed specified values for the surge arrester and for its installation environment. Unacceptably high temperatures may cause the surge arrester to catch fire.
- Surge arrester is normally connected to the associated external terminal of the surge arrester with the aid of a fusible element under normal operating conditions.
- the fusible element establishes an electrical contact and mechanically connects the electrode to the external connection.
- the surge arrester further includes an extinguishing device configured to extinguish an arc.
- the arc either burns when the surge arrester responds between the two electrodes, or develops between the one electrode and the outer terminal when the fuse contacts and melts.
- the extinguishing device is triggered by the melting of the fusible element at too high a thermal load.
- the extinction of the arc is accomplished by extending the distance that the arc can travel or travel from one electrode to the other electrode or to the outer electrode of the surge arrester.
- the electrical circuit that is closed during the arcing between the electrodes of the surge arrester and the voltage or current source connected to the external electrodes is disconnected. As a result, a circuit is interrupted, so that no further thermal load occurs.
- the surge arrester with extinguishing device is set up so that the external integrity of the surge arrester is maintained even when the extinguishing device is triggered.
- External integrity means that the housing assembly of the surge arrester remains intact and no Parts that could cause damage outside the surge arrester may be detached or blown off.
- the extinguishing device is preferably arranged completely in the interior of the housing of the surge arrester.
- the extinguishing of the arc prevents thermal overloading from causing excessive overheating of the surge arrester and ignites the surge arrester. At the same time, it is possible that an arc-extinguishing gas or medium from the outside of the surge absorber flows into the interior of the surge absorber or into the vicinity of the extinguishing device and an arc generated by the separation process is extinguished.
- the melting element has the properties of a low-melting solder.
- a soft solder or a braze can be used. This ensures that, in the event of thermal stress on the surge arrester, first the solder of the melting element is melted before the remaining elements of the surge arrester can be damaged. The melting solder triggers the extinguishing device and an existing or resulting from the melting arc is deleted.
- the fusible element is configured to melt upon inadmissible heating and to cause the erasing device to move the one electrode to a position farther from the other electrode of the surge absorber, or to increase the distance formed therebetween.
- This embodiment makes it possible, by the movement of the one electrode not only to provide an extension of the distance between these two elements with respect to the other electrode, but also to move the one electrode out of the interior of the surge arrester so that it becomes safely inoperative. This achieves a particularly efficient protection against thermal overloading of the surge arrester and the device protected by it.
- the one electrode is formed in several parts and contains, in addition to the main electrode of the actual surge arrester, an auxiliary electrode with which the electrode is fixed in the surge arrester. Furthermore, the electrode has a pin pointing away from the interior of the surge arrester, which pin is electrically connected to the outer electrode by means of the fuse element.
- the fusible element is formed so that a gap is formed between the outer electrode and the one electrode connected thereto. In this gap is inadmissible heating of the surge arrester and a melting of the
- Melting element moves an insulating element, so that the connection between the outer terminal and the one electrode is separated and interrupted.
- the extinguishing device has a spring with which the movements required for the insulation are implemented.
- the spring has the advantage that on the one hand the melting element mechanically biased and upon release of the fusible element by a relaxation of the spring an efficient movement of the leading electrode or the insulating element is performed to perform the insulation.
- the spring is provided as a compression spring or as a tension spring.
- a compression spring has the particular advantage that the spring support can be easily performed.
- the extinguishing device is in one of the not connected to the melting electrode of the
- the separated space accommodating the extinguishing device can be optimally designed for the function to be performed by the extinguishing device.
- the separated space may contain a gas or a medium, which helps in triggering the melting element or the use of the extinguishing device to extinguish the resulting arc as efficiently as possible.
- the spring is particularly preferably designed as a compression spring, which is biased in the normal state, ie without response of the fusible element between the outer terminal and the one electrode. This makes it possible that when melting the
- Melting element relaxes the spring and this movement pulls the electrode from the interior of the surge arrester and separates from the outer terminal.
- the shape of the insulating element is adapted to the shape of the electrode.
- the insulating member preferably has the shape of a pot whose walls are between the
- an embodiment of the spring is provided as a tension spring.
- molten melting element With molten melting element, it is possible to actuate a contact element upon reaching the end position after the movement of the one electrode. By the spring and the contact element, an electrical contact is closed and generates an electrical signal. This electrical signal can be used for further processing, be used for example to display the functional state of the surge arrester.
- the surge arrester can be used in a device which places high demands both on faultless operation and on thermal and other loads.
- These include, for example, a power supply network, e.g. in a building, or a telecommunication facility or a telecommunications network, which can be efficiently protected against lightning and other surges with the surge arrester.
- the surge arrester is not limited in its use and can also be used in any other electrical circuit in which high voltages must be dissipated by means of a surge arrester.
- Overvoltage arrester on the fusible element designed to melt in the event of excessive thermal stress before other parts of the surge arrester can catch fire.
- an extinguishing device is triggered which extends a path extending from one electrode of the surge arrester to the other electrode of the surge arrester or to the outer electrode.
- the extension of the route is effected in that in a preferred method step, the electrode is moved away from the other electrode and is further away in its end position. there the external integrity of the surge arrester is maintained.
- an insulating element is moved into a space between the one electrode and the outer electrode with the aid of the extinguishing device.
- the one space is formed by melting of the fusible element and released for the movement of the insulating element.
- a contact element upon melting of the fusible element with the aid of the extinguishing device, a contact element is activated which generates an electrical signal and forwards it to a display or control device.
- FIG. 1 shows a surge arrester according to a first
- Embodiment in the normal state and after triggering of the extinguishing device 2 shows a surge arrester according to a second embodiment in the normal state and after a release of the extinguishing device.
- FIG. 1 schematically shows a first embodiment of a surge arrester.
- FIG. 1a shows the normal state and
- FIG. 1b shows the state after triggering of the extinguishing device.
- the surge arrester has an interior 10 as a discharge space, which is defined by a tubular insulator 11 and two on the outside of the housing
- Insulator molded outer electrodes 12 and 13 is formed.
- the outer electrode 12 is formed cup-shaped and protrudes with its cup into the interior 10 of the surge arrester.
- the cup bottom contains a hole 16 through which the inner electrode 15 is guided. Outside the inner space 10, the electrode 15 has a head 17 whose outer diameter is greater than the inner diameter of the hole 16.
- the electrode 15 with head 17 is connected to the outer terminal 12 by means of a fusible element 18.
- the melting element 18 is preferably designed as a soft solder or brazing alloy, so that in the normal state shown there is a good electrically conductive connection between the electrode 15 and the outer electrode 12.
- the fusible element is designed such that it covers the bottom of the cup and optionally enters into the hole 16 of the outer electrode 12.
- the the Interior 10 facing side of the head 17 of the electrode 15 is full on the cup bottom, so that the electrode 15 is guided exactly in the interior.
- the head 17 has on the side facing away from the interior 10 of the electrode 15, a pin 19, on which a receptacle 20 is screwed. Between the receptacle 20 and the outer electrode 12, a compression spring 21 is arranged, which is supported against both the electrode 12 and the receptacle 20.
- the receptacle 20 is guided in a tube 24 which is closed on the one hand by the electrode 12 and on the other hand by a connection 22.
- the terminal 22 is also cup-shaped and protrudes with its cup bottom in the interior 23 inside.
- Compression spring 21 in conjunction with the fusible element form the extinguishing device.
- the surge arrester is shown after the fuse has been triggered. It can be seen that the melting element 18 has been melted and the electrode 15 has been moved out of the interior 10 of the surge arrester by the force of the spring 21. As a result of the melting of the melting element 18, the compression spring 21 has moved from the pretensioned position according to FIG. 1 a into a relaxed position according to FIG. The movement of the electrode 15 is caught from the interior 10 of the
- a surge arrester is formed by means of an insulating tube 11, preferably made of ceramic or plastic, and an outer electrode 13.
- the outer electrode carries in the interior 10 of the surge arrester an electrode 14, which is tubular in the embodiment, but may also be pin-shaped.
- the counter electrode 30 to the electrode 14 is constructed in several parts. It contains in the interior of the
- the interior 10 of the surge arrester is closed by an auxiliary electrode 32, which is cup-shaped and whose cup bottom protrudes into the interior 10 and the pin electrode 31 carries.
- the pin electrode 31 is soldered or welded to the center electrode 32, for example.
- the electrode 30 On the side facing away from the interior 10, the electrode 30 has a pin 33 with a head 34.
- the head 34 is adapted to fit into the bowl of the
- Center electrode 32 fits and is soldered or welded to this.
- the pin 33 or the electrode member 33 formed as a pin electrode is surrounded by an insulating tube 35 which is arranged between the center electrode 32 and an outer electrode 36 of the surge arrester.
- the outer electrode 36 is shaped so that on the one hand enables a tight connection with the insulating tube 35 and on the other hand has a central hole 37 whose diameter is greater than the diameter of the pin 33 of the electrode 30.
- the insulating tube 35 preferably has the same outer and inner diameter as the insulating tube 11 of the actual discharge path of the surge arrester. However, it is not necessary that the insulating tube 35 must be made of the same material as the insulating tube 11. However, the insulation tube 35 is preferably also a ceramic tube.
- Outer electrode 36 has an edge 38, are formed by the two paragraphs of the outer electrode 36.
- the outer shoulder allows the attachment of a housing part 39, which is provided as a holding device for the spring of the extinguishing device. In a tension spring, the housing part 39 may also be omitted.
- the interior of the facing paragraph of the outer electrode 36 receives a solder pad 40.
- the Surface of this paragraph is aligned with the bottom of the pin 33, which is opposite to the head 34.
- the solder disk 40 is designed so that it connects the shoulder of the outer electrode 36 with the pin 33 of the one electrode 30 electrically good.
- a Isoliertopf 41 On the space or gap 37, which is formed between the outer electrode 36 and the pin 33 of the one electrode, externally presses a Isoliertopf 41.
- the pot 41 has an edge thickness which is at most equal to the difference of the outer diameter of the pin 33 to the inner diameter of the outer electrode 36 may be.
- a compression spring 42 is tensioned, which biases the insulating element 41 against the fusible element 40 in the normal state shown.
- the insulation pot 41 has an extension 43, which does not extend over the entire edge of the pot, and which extends through the melting element 40 into the space 37 between the outer electrode and the inner electrode 30. This extension makes it possible in the case of melting the
- the insulating element 41 is pushed by means of the relaxing spring 42 over the journal 33 of the one electrode of the surge arrester or into the hole of the outer electrode.
Landscapes
- Fuses (AREA)
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007056165A DE102007056165A1 (en) | 2007-11-21 | 2007-11-21 | Surge arrester with thermal overload protection |
PCT/EP2008/066015 WO2009065939A1 (en) | 2007-11-21 | 2008-11-21 | Surge arrester having thermal overload protection |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2212976A1 true EP2212976A1 (en) | 2010-08-04 |
EP2212976B1 EP2212976B1 (en) | 2012-04-04 |
Family
ID=40351989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08852430A Active EP2212976B1 (en) | 2007-11-21 | 2008-11-21 | Surge arrester having thermal overload protection |
Country Status (8)
Country | Link |
---|---|
US (1) | US8129648B2 (en) |
EP (1) | EP2212976B1 (en) |
JP (1) | JP2011504282A (en) |
KR (1) | KR20100090288A (en) |
CN (1) | CN101889375B (en) |
AT (1) | ATE552634T1 (en) |
DE (1) | DE102007056165A1 (en) |
WO (1) | WO2009065939A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2471869B (en) * | 2009-07-15 | 2012-04-25 | Vishay Resistors Belgium Bvba | Thermal switch |
CN101741081A (en) * | 2010-01-12 | 2010-06-16 | 佛山市浦斯电子有限公司 | Surge suppressor with thermal protective function |
JP5327916B2 (en) * | 2012-02-07 | 2013-10-30 | 東芝エレベータ株式会社 | Elevator equipment |
CN102856021B (en) * | 2012-09-27 | 2014-11-05 | 王巨丰 | Follow current-free arc lightening-protection gap protection device |
CN109416987B (en) * | 2016-07-06 | 2020-06-16 | Abb瑞士股份有限公司 | Fast grounding switch device for HV applications |
US10749333B2 (en) * | 2018-01-09 | 2020-08-18 | Eaton Intelligent Power Limited | Thermal limiter fuse system for electric motor protection |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2295320A (en) * | 1940-06-25 | 1942-09-08 | Gen Electric | Electric discharge device |
US2504438A (en) * | 1944-07-19 | 1950-04-18 | Electric Service Mfg Company | Circuit interrupter |
DE1006946B (en) * | 1955-03-05 | 1957-04-25 | Krone Kg | Protection device for electrical systems |
GB1066011A (en) | 1963-02-22 | 1967-04-19 | Ass Elect Ind | Improvements in voltage overload protection devices |
US4015228A (en) * | 1974-06-10 | 1977-03-29 | Matsushita Electric Industrial Co., Ltd. | Surge absorber |
US4004263A (en) * | 1975-06-09 | 1977-01-18 | Porta Systems Corporation | Protector module for telephone systems |
US4158869A (en) * | 1977-08-19 | 1979-06-19 | Reliable Electric Company | Line protector |
US4191987A (en) * | 1978-02-24 | 1980-03-04 | Gerald Coren | Clip-on protector |
US4493003A (en) * | 1983-01-28 | 1985-01-08 | Gte Products Corporation | Surge arrester assembly |
FR2574589B1 (en) * | 1984-12-12 | 1989-06-02 | Tubes Lampes Electriq Cie Indl | LOW-DIMENSIONAL OUTDOOR SHORT-CIRCUIT DEVICE |
US4866562A (en) * | 1988-01-26 | 1989-09-12 | Tii Industries, Inc. | Self-contained air gap assembly |
JP2820703B2 (en) * | 1989-01-25 | 1998-11-05 | 株式会社オリエント | Temperature current sensor |
JP2794346B2 (en) * | 1991-02-05 | 1998-09-03 | 三菱マテリアル 株式会社 | Surge absorber |
WO1995009468A1 (en) * | 1993-09-29 | 1995-04-06 | Russell William Adam | Open circuit protection device |
DE19619334A1 (en) | 1996-05-14 | 1997-11-20 | Dehn & Soehne | Method for extinguishing the arc of the line follow current in a spark gap and spark gap arrangement for carrying out the method |
SE518812C2 (en) * | 1998-03-17 | 2002-11-26 | Bjoern Heed | Catalytic regenerative device for purification of gases |
US6430019B1 (en) * | 1998-06-08 | 2002-08-06 | Ferraz S.A. | Circuit protection device |
US5959517A (en) * | 1998-07-21 | 1999-09-28 | Eaton Corporation | Fault current tolerable contactor |
JP3798194B2 (en) * | 1999-08-03 | 2006-07-19 | 矢崎総業株式会社 | Circuit breaker |
DE10025685A1 (en) | 2000-05-19 | 2001-11-29 | Siemens Ag | Isolating switch device for high voltage surge absorber has least one ring electrode with electric field concentrating protrusion near ring electrode overlap that acts as spark ignition aid |
DE102005036265A1 (en) * | 2005-08-02 | 2007-02-08 | Epcos Ag | radio link |
CN200956352Y (en) * | 2006-09-04 | 2007-10-03 | 高钰 | Surge protector with thermal release device |
DE102007024622B4 (en) * | 2007-04-24 | 2017-02-23 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection device |
-
2007
- 2007-11-21 DE DE102007056165A patent/DE102007056165A1/en not_active Withdrawn
-
2008
- 2008-11-21 EP EP08852430A patent/EP2212976B1/en active Active
- 2008-11-21 AT AT08852430T patent/ATE552634T1/en active
- 2008-11-21 CN CN200880117210.1A patent/CN101889375B/en not_active Expired - Fee Related
- 2008-11-21 WO PCT/EP2008/066015 patent/WO2009065939A1/en active Application Filing
- 2008-11-21 KR KR1020107013738A patent/KR20100090288A/en not_active Application Discontinuation
- 2008-11-21 JP JP2010534494A patent/JP2011504282A/en not_active Withdrawn
-
2010
- 2010-05-19 US US12/783,346 patent/US8129648B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2009065939A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2212976B1 (en) | 2012-04-04 |
US20100314358A1 (en) | 2010-12-16 |
DE102007056165A1 (en) | 2009-05-28 |
ATE552634T1 (en) | 2012-04-15 |
CN101889375A (en) | 2010-11-17 |
KR20100090288A (en) | 2010-08-13 |
WO2009065939A1 (en) | 2009-05-28 |
JP2011504282A (en) | 2011-02-03 |
US8129648B2 (en) | 2012-03-06 |
CN101889375B (en) | 2013-05-15 |
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