EP4374405A1 - Procédé de fabrication d'un élément de contact pour interrupteur à vide, élément de contact et interrupteur à vide - Google Patents

Procédé de fabrication d'un élément de contact pour interrupteur à vide, élément de contact et interrupteur à vide

Info

Publication number
EP4374405A1
EP4374405A1 EP22786330.5A EP22786330A EP4374405A1 EP 4374405 A1 EP4374405 A1 EP 4374405A1 EP 22786330 A EP22786330 A EP 22786330A EP 4374405 A1 EP4374405 A1 EP 4374405A1
Authority
EP
European Patent Office
Prior art keywords
contact
conductive material
contact element
powder
die
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.)
Pending
Application number
EP22786330.5A
Other languages
German (de)
English (en)
Inventor
Hermann BÖDINGER
Frank Graskowski
Eckehard Isenberg
Carsten Schuh
Kira Berdien WÜSTENBERG
Alexander Ziefle
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 EP4374405A1 publication Critical patent/EP4374405A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6646—Contacts; Arc-extinguishing means, e.g. arcing rings having non flat disc-like contact surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/0203—Contacts characterised by the material thereof specially adapted for vacuum switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6642—Contacts; Arc-extinguishing means, e.g. arcing rings having cup-shaped contacts, the cylindrical wall of which being provided with inclined slits to form a coil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6643—Contacts; Arc-extinguishing means, e.g. arcing rings having disc-shaped contacts subdivided in petal-like segments, e.g. by helical grooves

Definitions

  • the present invention relates to a novel production method for a contact element for vacuum switches, a contact element that is produced or can be produced according to the method, and a vacuum switch with such a contact element.
  • Vacuum interrupters for the low, medium and high voltage range are used in particular to switch off currents greater than a few kiloamperes, so-called radial or axial magnetic field contacts (RMF or AMF contacts).
  • RMF radial or axial magnetic field contacts
  • Structure, function and operating principles of such contact elements in conventional construction are, for example, in the dissertation published in 2003, "Modeling of the plasma in the vacuum circuit breaker taking into account axial magnetic fields" by K. Jenkes-Botterweck, available online at http://publications. rwth-aachen, de/ record/ 58842, comprehensively described.
  • spiral and pot contacts Widely used designs are the spiral and pot contacts.
  • the required magnetic field is generated by the geometric design of the contact disk itself; on which the contact disc is placed.
  • the bobbins are preferably made from copper bar stock or from preformed copper compacts.
  • the magnetic field generation by the often called hollow Cylinder running coil body is achieved by an appropriate Schitz zgabe.
  • the contact disks are often provided with slots to reduce eddy currents. The slots of both parts must be aligned with each other during assembly.
  • the contact disk and contact carrier of conventional contact elements are therefore manufactured in different work steps and from different materials in order to achieve the properties desired in each case.
  • this is in particular a high level of conductivity; in the case of the contact disk, an essential property is the resistance to erosion that occurs as a result of arcing events when switching.
  • the contact disk and contact carrier are connected to one another by means of a cohesive process, for example by brazing.
  • this production step breaks down into several individual steps and causes considerable effort and costs, since the quality of the connection between the contact disk and the contact carrier has a decisive influence on the switching performance of the vacuum interrupter. The assessment or In addition, quality control of the connection between contact disc and contact carrier is only possible with considerable effort.
  • DE 33 02 595 A1 discloses a contact carrier in which a coiled or body provided with helical recesses is cast from a first material of lower electrical conductivity with a second material of higher conductivity and lower melting and casting temperature, in particular the spaces between the screw turns or the recesses are cast.
  • the body made from the first material represents part of the casting mold for the second material.
  • On the contact carrier is then on a contact disk is soldered onto the contact-making end face, as already explained above.
  • DE 195 13 790 A1 discloses a contact element in which an arc electrode part, an arc electrode holding part, a coil electrode part and an electrode rod (current supply part) are designed in such a way that they form an integral structure. At this time, at least one of the connection portions between the arc electrode part and the arc electrode holding part 12, the coil electrode part 12 and the power supply part 12 is integrally manufactured according to hot isostatic pressing (HIP) processing.
  • HIP hot isostatic pressing
  • This object is achieved according to the invention by a production method in which a first powdery mixture comprising particles of the first conductive material and particles of the second conductive material or a first pre-pressed, disc-shaped green body consisting of a composite of at least the first and the second conductive material is placed in a press -Matri ze is introduced.
  • An inner ram is introduced into the die and a second powder of the first conductive material or a second powder-like mixture comprising particles of the first conductive material or a second pre-pressed green body comprising the first conductive material is introduced into a space between the die and the inner ram.
  • An outer ram is placed in the space between the die and the inner ram.
  • an electrical voltage is also applied to the press ram and the die.
  • the voltage feed-in points and the electrical power fed in are selected in such a way that the currents flowing through the powder or green body are approximately equally distributed.
  • the die and/or the press ram are provided with a release agent, in particular with a graphite coating or a boron nitride coating, before being brought into contact with one of the powders or green bodies.
  • the first powder is a mixture of copper particles and chromium particles, in particular in a ratio of CuCr25 or CuCrSO or CuCr35.
  • a plurality of oblique slots distributed over the circumference are introduced into the contact element or the area forming the contact body in such a way that a current flow can generate a magnetic field that Movement of an emerging arc on a predetermined path and / or causes a large-scale spread of the arc.
  • the present invention also relates to a contact element for a vacuum switch produced by or that can be produced by the aforementioned method, with a contact body consisting of a first conductive material or a composite material. material, which has a first conductive material, and a contact disk consisting of a composite material, in particular a particle composite material, which has at least one second conductive material in addition to the first conductive material.
  • the contact element is a uniform body with at least two areas with different material composition, the material composition of the two areas being based on the requirements explained above: the material of the area which is the contact carrier or. corresponds to the contact body of a conventional contact element is chosen to have high conductivity and the material of the area corresponding to the contact disc of a conventional contact element is chosen to resist the erosion caused by arcing events during switching is able .
  • the first conductive material is copper.
  • the second conductive material is chromium, in particular CuCr25 or CuCr30 or CuCr35 being used as the (particulate) composite material.
  • the present invention also relates to a vacuum switch with a vacuum chamber, within which two contact elements are arranged, with at least one of the contact elements being designed in accordance with the present invention.
  • One advantage of the present invention is that the production costs for a contact element according to the invention are reduced compared to the prior art. In particular, there is no need to solder the various parts used in the prior art for the contact body and contact disk, or to carry out the necessary pre- preparatory steps . Furthermore, the present invention ensures that the connection between the contact body and the contact disk is ideal at every point and is not caused by air inclusions, locally different soldering temperatures or mechanically or thermally caused enlarged soldering gaps or surface contamination, etc. Has flaws that negatively affect the magnetic field and can lead to an increase in the electrical resistance of the vacuum interrupter.
  • Fig. 1 shows an AMF contact according to an embodiment of the present invention in a schematic representation
  • Fig. 2 shows an RMF contact according to another embodiment of the present invention from a schematic representation
  • Fig. 3 shows a vacuum interrupter according to an embodiment of the present invention schematically in a partially sectional view
  • Fig. 4A-D illustrate an exemplary embodiment of the manufacturing method according to the invention.
  • Fig. 1 shows an AMF contact element 10 for a vacuum switch with a contact body 11 consisting of a first conductive material or a composite material which has a first conductive material.
  • the first conductive material is preferably copper.
  • a contact disk 12 or a contact disk portion is integrally formed on a surface of the contact body 11, more specifically on the surface of the contact body, which will later form the separable electrical connection of the vacuum switch.
  • Contact disk 12 consists of a composite material, in particular a particle composite material, which has at least one second conductive material in addition to the first conductive material.
  • the second conductive material is preferably chromium or another material that increases the resistance of the composite material to erosion.
  • the contact element 10 has a plurality of oblique slots 13 distributed over the circumference, which are introduced into the contact element in such a way that they (together with the geometry of the corresponding mating contact) the formation of an axial magnetic field and thus a large-area distribution of an emerging Cause arcing on the contact disk.
  • Fig. 2 shows an RMF contact element 20 for a vacuum switch with a contact body 21 again consisting of a first conductive material or a composite material, which has a first conductive material.
  • the first conductive material is preferably copper.
  • An annular contact disk 22 or. an annular contact disk area is in turn formed in one piece on a surface of the contact body 21 , more precisely on the surface of the contact body which is later to form the separable electrical connection of the vacuum switch.
  • the ring-shaped contact disk 22 consists of a composite material, in particular a particle composite material, which has at least one second conductive material in addition to the first conductive material.
  • the second conductive material is preferably chromium or another material Material that increases the resistance of the composite to charring.
  • the contact body 21 has a plurality of oblique slots 23 distributed over the circumference, which are introduced into the contact body in such a way that they (together with the geometry of the corresponding mating contact) reduce the thermal load on the contacts by rotation of the arc around the longitudinal axis of the arrangement on the contact discs.
  • Fig. 3 shows a vacuum interrupter 100 with two contacts 10, 20 according to the present invention.
  • two RMF contacts 20 according to FIG. 2 in detail, the different areas 21 , 22 of which are shown clearly differently for better differentiation.
  • AMF contacts shown in FIG. 1 or other forms of contact designed in accordance with the present invention are used.
  • the vacuum switch 100 has a fixed connecting disk or a fixed connection bolt zen 110 made of conductive material, preferably made of copper. This is connected to a fixed contact 10, 20 according to the present invention.
  • a moveable contact 10 , 20 according to the present invention is coplanar with the fixed contact and is carried by a moveable terminal stud 170 .
  • the vacuum switch is closed by an axial movement of the movable connection bolt 170 in the direction of the fixed connection bolt 110, and the vacuum switch is opened by a movement in the opposite direction.
  • the movable connecting bolt is guided in a guide 160 .
  • the two contacts 10 , 20 are arranged in a vacuum chamber 130 which is lined with a screen 140 and consists of a body 120 made of insulating material.
  • a metal bellows 150 is used to seal the vacuum chamber 130 to the environment in the area where the movable connecting bolt is carried out into the vacuum chamber.
  • Fig. 4 shows using the example of an AMF contact according to FIG. 1 shows a preferred exemplary embodiment of the manufacturing method according to the invention.
  • the preferred exemplary embodiment uses a field and pressure-assisted sintering process, particularly preferably the so-called spark plasma sintering process (SPS process).
  • SPS process spark plasma sintering process
  • a contact element 10 , 20 is produced by introducing a starting powder or a pre-pressed green body into a die and subjecting it to a uniaxially acting pressure via a press ram. At the same time, electric current flows through the sample to be sintered in a kind of series connection via the press ram and the ram of the matrix. The resulting Joule heating of the sample or of the die leads to a very rapid heating of the sample and thus enables the ef fi cient sintering of the material.
  • the starting point is , Fig . 4A, a mixture 32 of particles of a first and a second material, preferably copper and chromium, more preferably according to one of the already mentioned mixtures of copper and chromium with a chromium content of 25% or 30% or 35%.
  • This is placed in the press die consisting of a sleeve 210 and a lower punch 240 .
  • a disk-shaped, pre-pressed green body can also be placed in the die. This areally distributed material 32 or the disk-shaped green body later forms the contact disk area 12 , 22 of the contact element 10 , 20 .
  • An inner ram 220 in the form of a cylinder is then introduced, which has a smaller outside diameter compared to the inside diameter of the sleeve 210 of the press die.
  • powder 31 of the first material preferably copper powder.
  • a hollow, cylindrical, pre-pressed green body or a pre-machined cylinder blank can also be inserted here. This powder 31 or the hollow cylindrical green body later forms the contact body region 11 , 21 of the contact element 10 , 20 .
  • an outer ram 230 in the form of a pipe section or Hollow cylinder introduced, which fits exactly into the gap or Clearance between the inner ram 220 and the sleeve 210 fits, and a pressing pressure A is applied.
  • a voltage is preferably applied to the pressing tools in order to bring about the targeted heating described above.
  • the shape of the outer ram 230 is preferably chosen so that when a pressure A is exerted, the powder 31 with a higher layer is first pressed before the pressure A possibly increases. is increased and also acts as pressure B on the inner ram, Fig. 4D, so that the pressing pressure and the electric current are distributed as evenly as possible over the entire surface of both press rams 220, 230.
  • Fig. 4D shows a special embodiment with a lower punch 240 that is movable relative to the sleeve 210 and pressing action A on the outer punch 230 , pressing action B on the inner punch 220 , and pressing action C on the lower punch 240 .
  • the pressing action A and B and C is brought about by a press, the pressures associated with FIG.
  • the shape of the inner and outer press ram described in FIG. 4B means that initially a press pressure A acts only on the outer press press ram 230 and only after a certain compaction of the powder 31 is a press pressure B also exerted on the inner press press ram 220 and the powder 32 is pressed, which is optionally supported by a movement C of the lower punch 240 relative to the sleeve 210 .
  • sintering takes place with at least di f fusion processes and usually also chemical reactions or Alloy formations in the interface area between the two materials.
  • the method described above produces a dense, monolithic contact having a contact disk area 12, 22 and a coil body area 11, 21 in-situ.
  • Metal surfaces that are in contact with one another and/or those surfaces of the individual parts 210, 220, 230, 240 of the press die that are in contact with the powder to be sintered or Green bodies are provided with a release agent, for example with a graphite coating or with a boron nitride coating. Such a release agent makes it easier to disassemble the press die and remove the composite body produced after the pressing process.
  • a contact element is available whose surfaces depend on the to be achieved Quality still have to be processed, for example by polishing, for example to achieve a contact surface that is as flat as possible and free of grooves. It is also usually necessary to slit either the coil body or the entire contact, as in connection with FIG. 1 and fig. 2 discussed .
  • the advantage here is that the slits in the contact disk areas 12 , 22 and the contact body areas 11 , 21 can be made in one work step and the laborious alignment of pre-slit individual elements, as is required in the prior art, can be omitted.
  • Another advantage is that the sintered contact element is very close to the final shape, d. H . there is very little waste material in the final processing.
  • the contact body from a composite material by adding a suitable powder mixture of copper and another material that exceeds the strength of copper in the sintered state instead of pure copper powder 31, 31A. This can also be done locally, i . H . for example in areas of the contact body 11 , 21 which are exposed to particular mechanical and/or electrical loads, such as the joints between the contact 10 , 20 and the connecting bolts 110 , 170 .
  • annular contact disk area in a first sintering process and to design this annular contact disk area into a full-surface contact disk in a second sintering process (not shown).
  • a different material composition can be selected for the annular contact disk area than for the inner contact disk area, for example the proportion of chromium in the inner contact disk area can be increased compared to the surrounding annular contact disk area. be increased, or other materials can be added.
  • a full-surface contact disk 12 can be produced whose conductivity and magnetic properties vary over the radius of the contact disk in order to advantageously influence the current distribution and/or heat dissipation in the contacted state and/or the arc conduction during the opening process.
  • material compositions that vary over the radius of the contact disk can be achieved by filling the press die with radially different powder compositions instead of a uniformly mixed powder 32 .
  • This configuration has the advantage that smooth transitions are formed between the individual areas and the electrical and/or magnetic properties thus change less abruptly than in the exemplary embodiment described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un élément de contact (10, 20) pour un interrupteur à vide (100). Selon l'invention, un premier mélange pulvérulent (32) comprenant des particules du premier matériau conducteur et des particules du deuxième matériau conducteur ou un premier corps vert en forme de disque pré-comprimé constitué d'un composite comprenant au moins le premier et le deuxième matériau conducteur est introduit dans une matrice de pressage (210, 240). Un poinçon de presse intérieur (220) est introduit dans la matrice et une deuxième poudre (31, 31A) du premier matériau conducteur ou un deuxième mélange pulvérulent comprenant des particules du premier matériau conducteur ou un deuxième corps vert pré-comprimé présentant le premier matériau conducteur est introduite dans un espace intermédiaire situé entre la matrice et le poinçon de presse intérieur. Un poinçon de presse extérieur (230) est introduit dans l'espace intermédiaire entre la matrice et le poinçon de presse intérieur. Une pression de compression (A, B) est exercée sur les poinçons de presse extérieur et intérieur, de telle sorte qu'une zone en forme de disque formant un disque de contact (12, 22) de l'élément de contact (10) est formée à partir du premier mélange pulvérulent (32) ou du premier corps vert, et une zone formant un corps de contact (11, 21) ou un support de contact de l'élément de contact est formée à partir de la deuxième poudre (31, 31A) ou du deuxième mélange pulvérulent ou du deuxième corps vert.
EP22786330.5A 2021-09-23 2022-09-15 Procédé de fabrication d'un élément de contact pour interrupteur à vide, élément de contact et interrupteur à vide Pending EP4374405A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021210641.2A DE102021210641B4 (de) 2021-09-23 2021-09-23 Herstellungsverfahren für ein Kontaktelement für Vakuumschalter, Kontaktelement sowie Vakuumschalter
PCT/EP2022/075611 WO2023046562A1 (fr) 2021-09-23 2022-09-15 Procédé de fabrication d'un élément de contact pour interrupteur à vide, élément de contact et interrupteur à vide

Publications (1)

Publication Number Publication Date
EP4374405A1 true EP4374405A1 (fr) 2024-05-29

Family

ID=83688848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22786330.5A Pending EP4374405A1 (fr) 2021-09-23 2022-09-15 Procédé de fabrication d'un élément de contact pour interrupteur à vide, élément de contact et interrupteur à vide

Country Status (5)

Country Link
US (1) US20240331960A1 (fr)
EP (1) EP4374405A1 (fr)
CN (1) CN117999625A (fr)
DE (1) DE102021210641B4 (fr)
WO (1) WO2023046562A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4325734A (en) * 1980-03-27 1982-04-20 Mcgraw-Edison Company Method and apparatus for forming compact bodies from conductive and non-conductive powders
DE3302595A1 (de) 1983-01-27 1984-08-02 Calor-Emag Elektrizitäts-Aktiengesellschaft, 4030 Ratingen Kontaktanordnung fuer vakuumschalter
TW265452B (fr) 1994-04-11 1995-12-11 Hitachi Seisakusyo Kk
DE19612143B4 (de) * 1996-03-27 2005-05-04 Abb Patent Gmbh Verfahren zur Herstellung eines Spiralkontaktstückes für eine Vakuumkammer und Vorrichtung zur Durchführung des Verfahrens
WO2014202390A1 (fr) * 2013-06-20 2014-12-24 Siemens Aktiengesellschaft Procédé et dispositif de fabrication d'éléments de contacts de commutation électrique
DE102017214805A1 (de) 2017-08-24 2019-02-28 Siemens Aktiengesellschaft Strombegrenzung mit einem Vakuumschalter
DE102019216869B4 (de) 2019-10-31 2023-02-16 Siemens Aktiengesellschaft Kontaktbolzen zum Abschirmen und Halten einer Kontaktscheibe, Vakuum-Schaltelement aufweisend eine Kontaktscheibe und Verfahren zum Herstellen eines Kontaktbolzens

Also Published As

Publication number Publication date
CN117999625A (zh) 2024-05-07
WO2023046562A1 (fr) 2023-03-30
DE102021210641B4 (de) 2024-10-02
US20240331960A1 (en) 2024-10-03
DE102021210641A1 (de) 2023-03-23

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