EP2503584A1 - Cartouche fusible et dispositif de protection contre les surtensions - Google Patents

Cartouche fusible et dispositif de protection contre les surtensions Download PDF

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Publication number
EP2503584A1
EP2503584A1 EP20120155736 EP12155736A EP2503584A1 EP 2503584 A1 EP2503584 A1 EP 2503584A1 EP 20120155736 EP20120155736 EP 20120155736 EP 12155736 A EP12155736 A EP 12155736A EP 2503584 A1 EP2503584 A1 EP 2503584A1
Authority
EP
European Patent Office
Prior art keywords
ceramic body
fuse
sand
volume
insert
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.)
Withdrawn
Application number
EP20120155736
Other languages
German (de)
English (en)
Inventor
Markus Faltermeier
Thomas Lohr
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP2503584A1 publication Critical patent/EP2503584A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/0078—Security-related arrangements
    • H01H85/0082—Security-related arrangements preventing explosion of the cartridge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/43—Means for exhausting or absorbing gases liberated by fusing arc, or for ventilating excess pressure generated by heating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H01H85/175—Casings characterised by the casing shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/18—Casing fillings, e.g. powder

Definitions

  • the invention relates to a fuse insert - especially for semiconductor protection fuses - which has a filled with solidified sand ceramic body. Furthermore, the invention relates to an overcurrent protection device with such a fuse link.
  • a fuse is an overcurrent protection device that interrupts the circuit by melting one or more fusible links when the current exceeds a certain level over a certain period of time. It consists of an insulating body, which has two electrical connections, which are interconnected in the interior of the insulating body by a fusible link. The fusible conductor is heated by the current flowing through it and melts when the relevant nominal current of the fuse is clearly exceeded for a certain period of time. Due to its good insulating effect is used as the material for the insulating body mostly ceramic.
  • the melt conductor is surrounded by quartz sand.
  • a ceramic body forms the housing of the fuse link, in which the solidified sand, the electrical connections and the fusible conductor are accommodated or held.
  • the quartz sand acts as an arc extinguishing agent: the rated current of the fuse is clearly exceeded - for example, due to a short circuit - so this leads to a response of the fuse, in the course of which the fusible element melts first and then evaporated due to the high temperature development. This creates an electrically conductive plasma, via which the current flow between the electrical connections is initially maintained - it arises an arc.
  • the fuse protection insert according to the invention in particular for semiconductor protection fuses, has a ceramic body filled with solidified sand.
  • the ceramic body in turn has a volume reservoir, which is designed such that upon an increase in internal pressure in the ceramic body due to a temperature expansion of the solidified sand through the volume reservoir, an additional volume is released in the ceramic body to expand the solidified sand.
  • the ceramic body and the solidified sand generally have different coefficients of thermal expansion, ie, the solidified sand expands at a temperature increase more than the ceramic body surrounding the solidified sand, which at a temperature increase to an increase of the internal pressure in the ceramic body and thus to stresses in the ceramic body leads.
  • the internal pressure arising in the ceramic body can be limited to a tolerable value become. In this way, damage to the ceramic body by stress cracks, caused by the different degrees of thermal expansion solidified sand and ceramic body, avoided. The robustness of the fuse insert is thereby significantly improved.
  • the ceramic body can be used for the production of the ceramic body to a ceramic with a lower alumina content.
  • a ceramic is cheaper to produce and, on the other hand, simpler to process, so that the manufacturing costs of the fuse-linkage insert can be significantly reduced as a result.
  • a simpler ceramic can thus be used for the same power; special designs for problematic operating conditions, which even high-quality ceramics are not sufficient for, can be realized by introducing an additional body into the solidified sand.
  • the volume reservoir is formed on an inner wall of the ceramic body.
  • the ceramic body is a housing of the fuse insert, the interior of which is designed to receive the solidified sand.
  • the arrangement of the volume reservoir on an inner wall of the ceramic body - and thus in the immediate vicinity of the solidified sand - ensures that the additional volume released by the volume reservoir is directly available for the expansion of the solidified sand.
  • the volume reservoir is separated from the solidified sand by a web of the ceramic body.
  • the web is designed such that it breaks upon reaching a predefined internal pressure, whereby the additional volume for the expansion of the solidified sand in the ceramic body is released.
  • the web has a comparatively thin wall thickness, which acts as a "predetermined breaking point" in the event of a pressure increase inside the ceramic body - i. breaks down - so that the previously sealed off from the solidified sand volume reservoir is released and is available for further expansion of the consolidated sand.
  • the ceramic body may also have a plurality of volume reservoirs divided by webs.
  • the webs may have different wall thicknesses, so that they do not break at the same time, but one after another at a swelling of the internal pressure. In this way, the additional volume for further expansion of the solidified sand may be cascaded, i. in several portions, to be released.
  • the volume reservoir is filled with an air or gas mixture.
  • air represents a simple and cost-effective way to improve the fuse link.
  • a gas mixture - for example, inert that is, inert gases such as nitrogen or noble gases - can be used.
  • the volume reservoir is filled with unconsolidated sand.
  • the additional volume provided by the volume reservoir can be limited to a low value without adversely affecting the accuracy of the triggering of the fuse link insert.
  • a certain manufacturing accuracy of the ceramic body in terms of its geometry and its wall thickness is required.
  • the conditional by the manufacturing process minimum wall thickness in turn requires a minimum size of the volume reservoir, which difficult with only a small additional volume realize is.
  • volume reservoir with unconsolidated sand, however, makes it possible to provide only a small additional volume for further expansion of the solidified sand, even in the case of the geometrically determined minimum size of the volume reservoir described above, wherein the threshold value of the internal pressure, from which the additional volume is to be available, can be predetermined with relatively good accuracy.
  • the volume reservoir is filled with an elastic material.
  • filling the volume reservoir with an elastic material is a convenient way to provide only a small additional volume for further expansion of the consolidated sand.
  • the filling with elastic material has the further advantage that no voids are formed in the solidified sand in the provision of the additional volume. Instead, the further expansion of the solidified sand is achieved at almost constant internal pressure by compressing the elastic body.
  • the fuse insert of the ceramic body can be produced by extrusion.
  • An extrusion process is a simple and extremely cost-effective way of producing the ceramic body, which is particularly suitable for the processing of simple ceramic materials.
  • High quality ceramics, especially those with a high alumina content, are only partially suitable or even completely unsuitable for processing by means of an extrusion process.
  • the overcurrent protection device according to the invention has at least one fuse link according to the above statements. With regard to the advantages of such an overcurrent protection device Reference is made to the preceding remarks on the advantages of the fuse protection insert according to the invention.
  • FIG. 1A shows a plan view
  • FIG. 1B the fuse element 10 is shown in a perspective view.
  • the fuse link 10 has a ceramic body 11 in the form of a tubular hollow body, at both ends of which is in each case an opening 15.
  • the inner region of the ceramic body 11 surrounded by the tubular hollow body essentially serves as a receiving space 12 for receiving solidified sand (not shown), which serves as extinguishing agent for extinguishing a fire fuse insert 10 that is triggered Arc serves.
  • a contact element (not shown) can be arranged in each case, via which the fuse link 10 can be contacted with an electrical line to be protected.
  • a respective cover plate (not shown, which can be fastened to the ceramic body via a plurality of bores 19 formed in the ceramic body 11, the respective contact element is centered and held relative to the ceramic body 11.
  • the two cover plates serve the two openings 15 A so-called fusible conductor (not shown), which connects the two contact elements in the interior of the fusible link insert in an electrically conductive manner, is generally arranged in the receiving space 12.
  • the fusible conductor is solidified in the fully assembled state Sand, for example quartz sand, surrounded, but not shown for reasons of clarity in the figures.
  • the ceramic body 11 has a volume reservoir in the form of a plurality of chambers 14, which are formed in the wall of the ceramic body 11 and each separated by a web 13 of the solidified sand.
  • the trapped by the chambers 14 volume - which may be filled, for example, with an air or gas mixture, with unconsolidated sand or with an elastic material - released. Since the solidified sand can now expand into this volume, the internal pressure drops back to a value below the threshold value. With a correct choice of the threshold value, damage to the ceramic body can thus be avoided.
  • FIGS. 2A and 2B a second embodiment of the fuse fuse according to the invention is shown in two perspective views.
  • the fuse link 10 in turn has a ceramic body 11, which is formed in this case as a hollow cylinder.
  • the ceramic body 11 of the second embodiment corresponds to the ceramic body 11 of the in terms of the technical structure and its function Figures 1A and 1B illustrated first embodiment.
  • FIG. 2B shows the ceramic body in a semi-transparent representation. It is clear that the chambers 14 and the webs 13 extend continuously over the entire length of the hollow cylindrical ceramic body 11. Since the ceramic body 11 otherwise has no undercuts, it can - if the ceramic material is suitable for this purpose - be prepared as an extruded part or by extrusion. Both original molding process is common that the material to be molded for the purpose of molding by means of a stamp or the like is pressed through a die. Both manufacturing methods are characterized by extremely low marginal costs and are particularly suitable for high volumes.
  • hollow cylinder and other hollow shapes for the design of the ceramic body 11, for example, hollow cuboid or hollow prisms are used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fuses (AREA)
EP20120155736 2011-03-22 2012-02-16 Cartouche fusible et dispositif de protection contre les surtensions Withdrawn EP2503584A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011005884A DE102011005884A1 (de) 2011-03-22 2011-03-22 Schmelzsicherungseinsatz und Überstrom-Schutzeinrichtung

Publications (1)

Publication Number Publication Date
EP2503584A1 true EP2503584A1 (fr) 2012-09-26

Family

ID=45655929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120155736 Withdrawn EP2503584A1 (fr) 2011-03-22 2012-02-16 Cartouche fusible et dispositif de protection contre les surtensions

Country Status (3)

Country Link
US (1) US20120242449A1 (fr)
EP (1) EP2503584A1 (fr)
DE (1) DE102011005884A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9689771B2 (en) 2013-06-13 2017-06-27 Progressive Products, Inc. Pipe and conduit wear detection system
US11923163B2 (en) 2019-01-16 2024-03-05 Siemens Aktiengesellschaft Fuse element and fuse

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2266291A1 (en) * 1974-03-29 1975-10-24 Faeam Cylindrical cartridge fuse - has inner compartments that shatter to permit gas expansion
GB2293929A (en) * 1994-10-03 1996-04-10 Soc Corp Microchip fuse

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1679971A (en) * 1921-11-28 1928-08-07 Hope Vernon Electric fuse or cut-out
DE414746C (de) * 1924-04-08 1925-06-11 Electrotherm G M B H Schmelzsicherung
US1905236A (en) * 1931-09-15 1933-04-25 Westinghouse Electric & Mfg Co Expulsion fuse
DE681391C (de) * 1936-09-20 1939-09-21 Siemens Schuckertwerke Akt Ges Sicherung mit festem, koernigem oder fluessigem Loeschmittel und keramischem aeusserem Sicherungsrohr
US2156058A (en) * 1937-04-10 1939-04-25 Gen Electric Electric protective device
US2636956A (en) * 1950-10-31 1953-04-28 Deltron Electric Products Inc Fused electrical connector
CH528816A (de) * 1971-03-15 1972-09-30 Bbc Brown Boveri & Cie Schmelzsicherung
GB2212993B (en) * 1987-11-30 1992-05-27 Yazaki Corp Fuse
JP3194429B2 (ja) * 1998-06-02 2001-07-30 オムロン株式会社 過電流遮断構造
US6762670B1 (en) * 2003-04-10 2004-07-13 Chun-Chang Yen Fuse apparatus with explosion-proof structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2266291A1 (en) * 1974-03-29 1975-10-24 Faeam Cylindrical cartridge fuse - has inner compartments that shatter to permit gas expansion
GB2293929A (en) * 1994-10-03 1996-04-10 Soc Corp Microchip fuse

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Publication number Publication date
DE102011005884A1 (de) 2012-09-27
US20120242449A1 (en) 2012-09-27

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