EP0640242B1 - Agencement de lames de contact de relais de transmission et de commutation de courants eleves - Google Patents

Agencement de lames de contact de relais de transmission et de commutation de courants eleves Download PDF

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Publication number
EP0640242B1
EP0640242B1 EP93909764A EP93909764A EP0640242B1 EP 0640242 B1 EP0640242 B1 EP 0640242B1 EP 93909764 A EP93909764 A EP 93909764A EP 93909764 A EP93909764 A EP 93909764A EP 0640242 B1 EP0640242 B1 EP 0640242B1
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EP
European Patent Office
Prior art keywords
contact
spring
contact spring
gap
current
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.)
Expired - Lifetime
Application number
EP93909764A
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German (de)
English (en)
Other versions
EP0640242A1 (fr
Inventor
Josef Weiser
Robert Esterl
Gerhard Furtwaengler
Horst Tamm
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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
Priority claimed from DE19924216080 external-priority patent/DE4216080A1/de
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0640242A1 publication Critical patent/EP0640242A1/fr
Application granted granted Critical
Publication of EP0640242B1 publication Critical patent/EP0640242B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2272—Polarised relays comprising rockable armature, rocking movement around central axis parallel to the main plane of the armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/38—Auxiliary contacts on to which the arc is transferred from the main contacts

Definitions

  • the invention relates to a contact spring arrangement for a relay for guiding and switching high currents with at least one elongated contact spring carrying a contact piece, which cooperates with a fixed, also carrying a contact piece counter-contact element, and with at least one rigid connecting leg for the contact spring, which is approximately parallel to this runs with the formation of a spring gap on the side opposite the contact piece and which leads the switching current in a direction opposite to the contact spring.
  • So-called miniature switching relays are used to connect devices to the mains voltage in the home and in industry. In a relatively small design with spring contacts, they handle the current loads in these applications down to the 50 A range. For higher currents, contactors are generally used, which are equipped with differently designed contact elements and correspondingly stronger drive systems for their application areas, but are accordingly also significantly larger in size than the relays mentioned.
  • the aim of the invention is to provide a dimensioning for such a contact spring arrangement of the type mentioned at the outset, with which the welding of the contact pieces can be reliably prevented even when the highest short-circuit currents occur.
  • the spring gap formed between the contact spring and its connecting element is so dimensioned that the repulsive forces generated by the current loop, which tend to close the contact on the opposite side of the spring, are greater than the counteracting forces even at the highest short-circuit currents who are looking to open the contact.
  • limit heating strength or current carrying capacity which in turn is defined as the quotient of the welding limit current strength [kA 2 ] and the contact force [N] and is a constant for a specific material.
  • FIG. 1 and 2 a relay for heavy current use is shown, the contact arrangement is designed according to the invention.
  • a magnet system with a coil, a core 3, two yokes 4, a permanent magnet 5 and a rocker armature 6 is arranged in a base body 1 from above.
  • An actuating finger 7 of the armature actuates a contact spring 9 via a slide 8, which in this example is split into a main spring leg 10 and a forward spring leg 11.
  • a spring support 12 extends from its connecting pin 12a to the fastening point 12b for the contact spring 9 approximately parallel to the latter, whereby a spring gap 13 is formed.
  • the contact pieces 14 and 15 of the contact spring 9 are located above the connecting pin 12a on the side opposite the spring support 12. They cooperate with corresponding contact pieces 16 and 17 of a counter-contact element 18 which, like the spring support 12, is anchored by inserting it into slots in the base body and has a connecting pin 18a.
  • the spring support 12 is so close to the contact spring 9 in the area between the contact piece 14 and the fastening point 12b that the length of the spring gap 13 is more than 30 times, but at least 20 times, as large as the average distance between the spring support 12 and the contact spring 9 As a result, the repulsive force between the spring support 12 and the contact spring 9 becomes so strong at high short-circuit currents that a brief lifting of the contact piece 14 from the contact piece 16 is avoided and welding of the contact is prevented.
  • the mating contact element 18 is arranged transversely to the spring support 12. As a result, the moving contact spring is not opposed by large metal parts that could lead to eddy current forces. Such eddy current forces could otherwise affect the desired repulsion of the current loop.
  • FIG. 5 shows a conventional set of contact springs with a switching contact spring 21 and a counter-contact spring 22, each of which closes a circuit via contact pieces 23 and 24, respectively.
  • the forces F s of such constructions according to FIG. 5 move at most in the region of less than 50 cN, since the distance D is in the order of twice the contact piece height.
  • the decisive geometry factor is the ratio of L / D with numerical values of less than 10.
  • DE 40 26 425 CI describes a measure to utilize the current loop with mutually encompassing contact springs to increase the contact force and thereby prevent the contacts from opening in the event of short circuits.
  • the current loop is formed by two contact elements which, when the contacts are open, have different potentials and thus create the risk of an arc in normal switching operation.
  • a current loop is formed between the spring support 12 and the contact spring 9 in the back of the switching contact piece 14, a good electrical conductor as the spring support 12 made of copper and a spring which is sufficiently dimensioned for the current strength i K to be used, also made of a copper alloy .
  • this spring carries the contact piece 14, which is preferably made of silver or a silver alloy, such as AgCdO or AgSn0 2 .
  • the contact is closed, the current flows in the spring support 12 in the opposite direction to the current in the contact spring 9.
  • the spring and the metal part (spring support 12) are electrically conductively connected at point 12a.
  • the dimensioning was not chosen so that the generated repulsive force would have been sufficient to prevent welding in the event of a short circuit.
  • D is the spring distance averaged over the entire length L of the spring gap.
  • the current loop In normal switching operation with alternating current, the current loop produces micro-oscillating effects in the closed contacts, which advantageously affect the current transmission, i. H. on the contact resistance.
  • the contact spring is folded like an accordion, as is shown schematically in FIG.
  • the folded contact spring 30 has five alternating sections 31, 32, 33, 34 and 35, so that together with the spring support 12 five spring gaps are formed with the corresponding average distances D1, D2, D3, D4 and D5.
  • the sum of all loop lengths L must then meet the above-mentioned conditions in relation to the mean value of all distances D1 to D5, that is to say must have at least 20 times the value of the mean column distance in the case of silver contacts.
  • the distances D1 to D5 could be the same and ensured, for example, by thin insulating foils.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Relay Circuits (AREA)
  • Contacts (AREA)

Claims (4)

1. Agencement de lames de contact de relais de transmission et de commutation de courants élevés, comportant au moins une lame de contact (9) allongée portant un élément de contact (14, 15), laquelle coopère avec un contre-élément de contact (18) fixe portant lui aussi un élément de contact (16, 17), et comportant au moins une branche de raccordement (12) rigide pour la lame de contact, qui s'étend de manière approximativement parallèle par rapport à ladite lame de contact en formant sur le côté opposé à l'élément de contact une fente de lame (13), et qui transmet le courant de commutation dans un sens opposé à la lame de contact (9), caractérisé en ce que la fente de lame (13) s'étend au moins approximativement sur toute la longueur de la lame de contact, à partir du point de fixation (12b) de celle-ci jusqu'à l'élément de contact (14, 15), et en ce que le rapport longueur (L)/distance (D) dans la fente de lame remplit sensiblement la condition suivante lorsque le contact est fermé:
Figure imgb0025
où
L = Longueur de la fente de lame
D = Distance moyenne dans la fente de lame
µo = Constante magnétique de champ =
Figure imgb0026
Hs = Puissance limite de chauffage ou capacité de charge de courant du matériel de contact
Figure imgb0027
2. Agencement de lames de contact selon la revendication 1, caractérisé en ce que le rapport longueur de la lame de contact/distance dans la fente de lame remplit la condition suivante:
Figure imgb0028
3. Agencement de lames de contact selon la revendication 1 ou 2, caractérisé en ce qu'un pliage de la lame de ressort (30) à la manière d'un accordéon met plusieurs fentes de lames (36, 37, 38, 39, 40) à la file, la somme des longueurs de fente rapportée à la largeur moyenne de fente remplissant la condition suivante:
Figure imgb0029
4. Agencement de lames de contact selon l'une des revendications 1 à 3, caractérisé en ce que la lame de contact est divisée en une branche de lame principale (10) comportant un élément de contact principal (14) en un alliage d'argent et une avant-branche de lame (11) comportant un avant- élément de contact (15) en tungstène.
EP93909764A 1992-05-15 1993-05-13 Agencement de lames de contact de relais de transmission et de commutation de courants eleves Expired - Lifetime EP0640242B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19924216080 DE4216080A1 (de) 1992-05-15 1992-05-15 Kontaktfedersatz zum Schalten hoher elektrischer Ströme
DE4216080 1992-05-15
DE4305034 1993-02-18
DE4305034 1993-02-18
PCT/DE1993/000419 WO1993023863A1 (fr) 1992-05-15 1993-05-13 Agencement de lames de contact de relais de transmission et de commutation de courants eleves

Publications (2)

Publication Number Publication Date
EP0640242A1 EP0640242A1 (fr) 1995-03-01
EP0640242B1 true EP0640242B1 (fr) 1995-10-25

Family

ID=25914832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93909764A Expired - Lifetime EP0640242B1 (fr) 1992-05-15 1993-05-13 Agencement de lames de contact de relais de transmission et de commutation de courants eleves

Country Status (7)

Country Link
US (1) US5583471A (fr)
EP (1) EP0640242B1 (fr)
JP (1) JPH07506697A (fr)
AT (1) ATE129594T1 (fr)
CZ (1) CZ271794A3 (fr)
SI (1) SI9300215A (fr)
WO (1) WO1993023863A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9317260D0 (en) * 1993-08-19 1993-10-06 Blp Components Ltd Solenoid operated switching devices
WO1998031036A1 (fr) * 1997-01-06 1998-07-16 Siemens Electromechanical Components, Inc. Dispositif de retenue d'un aimant de relais
GB2353598B (en) * 1999-08-24 2003-09-10 Siemens Metering Ltd Improvements in or relating to current measurement
GB2382467B (en) * 2001-11-22 2004-04-14 Blp Components Ltd Electrical contactor apparatus and method
US8395464B2 (en) * 2008-05-30 2013-03-12 Itron, Inc. Actuator/wedge improvements to embedded meter switch
US8890711B2 (en) 2009-09-30 2014-11-18 Itron, Inc. Safety utility reconnect
BR112012007323A2 (pt) * 2009-09-30 2019-09-24 Itron Inc desconexão remota de utilitário de um sistema de leitura de medidor.
CA2716046C (fr) 2009-09-30 2016-11-08 Itron, Inc. Soupape d'arret du gaz avec retroaction
DE102012006433B4 (de) 2012-03-30 2014-01-02 Phoenix Contact Gmbh & Co. Kg Relais mit verbesserten Isolationseigenschaften
DE102012006438A1 (de) 2012-03-30 2013-10-02 Phoenix Contact Gmbh & Co. Kg Relais mit zwei gegensinnig betätigbaren Schaltern
US9005423B2 (en) 2012-12-04 2015-04-14 Itron, Inc. Pipeline communications
JP2014203783A (ja) * 2013-04-09 2014-10-27 パナソニック株式会社 接点装置およびそれを用いた電磁リレー
EP2806441B1 (fr) * 2013-05-24 2017-07-12 Tyco Electronics Austria GmbH Dispositif de commutation électrique avec une force de Lorentz améliorée
GB2520572A (en) 2013-11-26 2015-05-27 Johnson Electric Sa Electrical Contactor
GB2520575A (en) 2013-11-26 2015-05-27 Johnson Electric Sa Electrical contactor
CN104362044B (zh) * 2014-10-28 2017-01-18 浙江正泰电器股份有限公司 防止大电流触点分离的继电器
DE202019103631U1 (de) * 2019-07-02 2019-07-10 Johnson Electric Germany GmbH & Co. KG Federbasiertes Kontaktsystem für die Schaltfunktion einer durch elektrischen Strom betriebenen Schalteinrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3419828A (en) * 1966-12-13 1968-12-31 Arrow Hart Inc Means proportional to magnetic flux to bias electric switch contacts closed
CH677162A5 (fr) * 1989-10-30 1991-04-15 Carlo Cavazzi Electromatic Ag
DE4026425C1 (fr) * 1990-08-21 1992-02-27 Siemens Ag, 8000 Muenchen, De

Also Published As

Publication number Publication date
WO1993023863A1 (fr) 1993-11-25
JPH07506697A (ja) 1995-07-20
EP0640242A1 (fr) 1995-03-01
US5583471A (en) 1996-12-10
SI9300215A (sl) 1993-12-31
ATE129594T1 (de) 1995-11-15
CZ271794A3 (en) 1995-02-15

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