EP3879555A1 - Déclencheur à surintensité thermique à base de cnt pour commutateurs électromécaniques - Google Patents

Déclencheur à surintensité thermique à base de cnt pour commutateurs électromécaniques Download PDF

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Publication number
EP3879555A1
EP3879555A1 EP20162398.0A EP20162398A EP3879555A1 EP 3879555 A1 EP3879555 A1 EP 3879555A1 EP 20162398 A EP20162398 A EP 20162398A EP 3879555 A1 EP3879555 A1 EP 3879555A1
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EP
European Patent Office
Prior art keywords
cnt
thermal overcurrent
release
heating element
overcurrent release
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Withdrawn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
EP20162398.0A
Other languages
German (de)
English (en)
Inventor
Anne Bauer
Wolfgang Feil
Stefan Gebert
Joachim Seidl
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
Priority to EP20162398.0A priority Critical patent/EP3879555A1/fr
Publication of EP3879555A1 publication Critical patent/EP3879555A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/164—Heating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/036—Application nanoparticles, e.g. nanotubes, integrated in switch components, e.g. contacts, the switch itself being clearly of a different scale, e.g. greater than nanoscale

Definitions

  • the invention relates to a composite material for a tripping element of a thermal overcurrent release, a thermal overcurrent release for an electromechanical switch with a tripping element having an expansion element and a heating element, as well as application examples of this thermal overcurrent release in an electromechanical switch, circuit breaker, circuit breaker and thermal overload relay.
  • strips made of bimetal are usually used, whereby FeNi36 is used as the material with a smaller expansion and FeNi20Mn6 with a larger expansion.
  • the bimetal heats up, expands in a defined manner and finally actuates a mechanical release device, provided that the shutdown takes place within a defined time window, i.e. that the bimetal is exactly is set to the desired switching characteristic.
  • a common embodiment for the bimetal strip is to wrap this with a metallic heating wire in order to obtain the desired properties.
  • the object of the present invention is to create a thermal overcurrent release with improved properties and to specify application examples of this thermal overcurrent release.
  • this object is achieved by a composite material composed of a first component selected from the group: metal or a plurality of metals and / or alloys and / or composites and / or plastics and / or a ceramic material and / or a plurality of ceramic materials; and from a second component selected from the group that contains CNT for a release element comprising an expansion element and a heating element of a thermal overcurrent release.
  • the second component is selected from a group which comprises materials or compounds with CNT or pure CNT.
  • Carbon nanotubes also called CNT, are microscopic, tubular structures, molecular nanotubes, made of carbon. Its walls consist exclusively of carbon, with the carbon atoms occupying a honeycomb-like structure with hexagons and three bonding partners each.
  • the diameter of the tubes is usually in the range from 1 to 50 nm. However, tubes with a diameter of 0.4 nm are also possible. Lengths of up to half a meter for individual tubes and up to 20 cm for tube bundles can be achieved. A distinction is made between single-walled and multi-walled designs and between open and closed tubes and between empty and filled tubes, for example with silver, liquid lead or noble gases.
  • the concept according to the invention for a thermal overcurrent release made from this composite material is based on only local, area-limited heating of the release element with at the same time only a slightly reduced deflection capacity due to the heating conductor.
  • carbon nanotubes, or CNTs for short are used as materials for the thermal overcurrent release, for example as a composite material with a metal or a plurality of metals or plastics.
  • the invention is based on different embodiments.
  • the first group is based on an expansion element containing CNT.
  • a first embodiment according to the invention consists in the form of a composite material made of CNT material, preferably CNT powder and / or individual or isolated CNT structures and a metal or a plurality of metals. These CNT components can possibly also be distributed with locally different concentrations, that is to say as a graduated material within the composite material, in order to set the exact deformation or expansion.
  • a second embodiment according to the invention is a composite material based on CNT material, preferably as CNT powder and / or individual or isolated CNT structures, with plastics, possibly with locally different CNT concentrations, in order to set the exact deformation or expansion.
  • connection techniques such as gluing, application in corresponding layers on metal or CNT material.
  • the most favorable connection technology in the application depends, among other things, on the specific geometry, e.g. the required thickness of the layers.
  • a partial coating of a metal with the CNT material is possible in order to set the exact deformation, e.g. also in the form of torsion, in particular bending torsion.
  • the second group is based on heating elements containing CNT.
  • a first exemplary embodiment here is a heating conductor made from pure CNT material.
  • a second embodiment of the invention exists in the form of a metal-CNT alloy, with copper, for example, being used as the metal.
  • the associated advantage is the smaller conductor cross-sections with a high current-carrying capacity and a high specific resistance with a low temperature coefficient, so that the expansion capacity of the release element is almost retained and the heat is kept locally and over a limited area.
  • the copper heating conductor is to be replaced with high currents, a smaller heating conductor cross-section is required. This leads to a lower stiffness, so that the expansion capacity of the release element is less influenced. There is also a better utilization of heat due to a locally more limited temperature distribution.
  • the heating conductor can be made of CNT material in the form of a fabric, since CNT materials can be transformed by means of textile processing methods.
  • the CNT material can also be processed with insulation materials either together or in a subsequent process step, corresponding to a glass fiber tube.
  • CNT has the advantage that it is also electrically conductive, i.e. the basic features of the current construction of the conventional bimetal can be adopted for the release element according to the invention.
  • the object is also achieved by a thermal overcurrent release for an electromechanical switch with a release element having an expansion element and a heating element, the expansion element and / or the heating element being / are designed to contain CNT.
  • An advantageous embodiment of the thermal overcurrent release according to the invention can consist in that the expansion element is designed as a composite material from a CNT component and a metal or a plurality of metals and / or alloys and / or composites and / or plastics.
  • Composites can be homogeneous or inhomogeneous or graduated material compositions also in the form of melts made of different materials, which are formed in this way are that they have the required temperature stability.
  • a special embodiment of the thermal overcurrent release according to the invention consists in that the expansion element is designed as a composite material with evenly and / or unevenly and / or graduated CNT components.
  • a continuation of the concept for the thermal overcurrent release according to the invention can consist in that the expansion element is designed as a composite material made of a metal or a plurality of metals and / or alloys and / or composites and a CNT foil.
  • thermo overcurrent release An extension of a special embodiment of the concept according to the invention for the thermal overcurrent release can provide that the heating element has a pure CNT component.
  • thermo overcurrent release according to the invention can consist in that the heating element is designed as a composite material from a CNT component and a metal or a plurality of metals and / or alloys and / or composites and / or a ceramic material or a plurality of ceramic materials is.
  • the heating element is designed as a composite material made of a metal or a plurality of metals and / or alloys and / or composites and / or a ceramic material or a plurality of ceramic materials and made of a coil-like wound Heating element or is formed from a woven, insulated or uninsulated heating element made of CNT.
  • the object of the present invention is also achieved by an electromechanical switch with a thermal overcurrent release, which has an expansion element and a heating element, the expansion element and / or the heating element being / are made to contain CNT.
  • the object of the present invention is also achieved by a circuit breaker with a thermal overcurrent release, which has an expansion element and a heating element, characterized in that the expansion element and / or the heating element is / are made to contain CNT.
  • Another application example that achieves the object of the present invention is a line circuit breaker with a thermal overcurrent release, which has an expansion element and a heating element, characterized in that the expansion element and / or the heating element is / are made to contain CNT.
  • the object of the present invention is also achieved by a thermal overload relay with a thermal overcurrent release, which has an expansion element and a heating element, characterized in that the expansion element and / or the heating element is / are made to contain CNT.
  • Fig. 1 shows a switching device, in particular a circuit breaker with a thermal overcurrent release in the form of a conventional bimetal.
  • the switching device has a housing 1 in which an extinguishing chamber 3 with extinguishing packets 4 is positioned in the lower region 2.
  • the thermal overcurrent release 6 is between the short-circuit release 7 and a Switching lock 8 placed.
  • a contact slide unit 9 is positioned between the extinguishing packets 4 of the extinguishing chamber 3, in which a movable contact arm with contact pieces is guided, which is arranged opposite a fixedly positioned contact arm with contact pieces.
  • a first exemplary embodiment of a material composition according to the invention of a thermal overcurrent release made of at least one metal 10 and a CNT film 11 is shown.
  • This composite material can be obtained in a manufacturing process, for example, by an adhesive process.
  • Fig. 3 shows a second embodiment for a material composition according to the invention of a thermal overcurrent release made of at least one metal 10 and a CNT additive 12 in the form of a graduated material.
  • the CNT material is present here in a graduated distribution in the composite material, ie, if you consider the thickness of this material excerpt, then in the present exemplary embodiment the CNT concentration on the underside 13 is lower than on the upper side 14.
  • the CNT concentration or the CNT- Portions can become larger and larger from the lower side 13 to the upper side 14 by continuously reducing the distance.
  • Fig. 4 a first embodiment of a material arrangement according to the invention of a trigger element 15 with a coil-like wound heating winding 16 made of CNT is shown.
  • Fig. 5 shows a second exemplary embodiment for a material arrangement according to the invention of a trigger element 15 with a heating coil 17 made of CNT and wrapped in a fabric-like manner.
  • Fig. 6 is a third embodiment of a material arrangement according to the invention of a trigger element 15 with a heating coil 17 made of CNT and wrapped in a fabric-like manner, including insulation 18 for the CNT.
  • the thermal overcurrent release according to the invention is characterized in that the heating conductor and / or the expansion element contain CNT.
  • the great advantage of the CNT material is its low coefficient of thermal expansion, so that only a small amount of heat input is required with constant deflection and greater deflection is achieved with constant heat input.

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EP20162398.0A 2020-03-11 2020-03-11 Déclencheur à surintensité thermique à base de cnt pour commutateurs électromécaniques Withdrawn EP3879555A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20162398.0A EP3879555A1 (fr) 2020-03-11 2020-03-11 Déclencheur à surintensité thermique à base de cnt pour commutateurs électromécaniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20162398.0A EP3879555A1 (fr) 2020-03-11 2020-03-11 Déclencheur à surintensité thermique à base de cnt pour commutateurs électromécaniques

Publications (1)

Publication Number Publication Date
EP3879555A1 true EP3879555A1 (fr) 2021-09-15

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EP20162398.0A Withdrawn EP3879555A1 (fr) 2020-03-11 2020-03-11 Déclencheur à surintensité thermique à base de cnt pour commutateurs électromécaniques

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EP (1) EP3879555A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061338A1 (de) * 2007-12-17 2009-04-23 Siemens Aktiengesellschaft Schalt- und/oder Schutzeinrichtung, insbesondere Niederspannungsleistungsschalter, Leistungsschutzschalter, Schütz, Überlastrelais und Lasttrennschalter
DE102008030988A1 (de) * 2008-06-27 2009-12-31 Siemens Aktiengesellschaft Bauteil mit einer Schicht, in die CNT (Carbon Nanotubes) eingebaut sind und Verfahren zu dessen Herstellung
DE102011078636A1 (de) * 2011-07-05 2013-01-10 Siemens Aktiengesellschaft Überlastauslöser, insbesondere für einen Leistungsschalter
WO2018206109A1 (fr) * 2017-05-11 2018-11-15 Siemens Aktiengesellschaft Procédé de fabrication de composants électrotechniques à l'aide de matériaux conducteurs à base de nanotubes de carbone (ntc)
US20190006127A1 (en) * 2017-06-28 2019-01-03 Siemens Industry, Inc. Light-weight, low-resistivity transfer materials and methods of making and products containing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061338A1 (de) * 2007-12-17 2009-04-23 Siemens Aktiengesellschaft Schalt- und/oder Schutzeinrichtung, insbesondere Niederspannungsleistungsschalter, Leistungsschutzschalter, Schütz, Überlastrelais und Lasttrennschalter
DE102008030988A1 (de) * 2008-06-27 2009-12-31 Siemens Aktiengesellschaft Bauteil mit einer Schicht, in die CNT (Carbon Nanotubes) eingebaut sind und Verfahren zu dessen Herstellung
DE102011078636A1 (de) * 2011-07-05 2013-01-10 Siemens Aktiengesellschaft Überlastauslöser, insbesondere für einen Leistungsschalter
WO2018206109A1 (fr) * 2017-05-11 2018-11-15 Siemens Aktiengesellschaft Procédé de fabrication de composants électrotechniques à l'aide de matériaux conducteurs à base de nanotubes de carbone (ntc)
US20190006127A1 (en) * 2017-06-28 2019-01-03 Siemens Industry, Inc. Light-weight, low-resistivity transfer materials and methods of making and products containing the same

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