EP0091082B1 - Elektromagnetisch betätigbares Schaltgerät - Google Patents

Elektromagnetisch betätigbares Schaltgerät Download PDF

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Publication number
EP0091082B1
EP0091082B1 EP83103136A EP83103136A EP0091082B1 EP 0091082 B1 EP0091082 B1 EP 0091082B1 EP 83103136 A EP83103136 A EP 83103136A EP 83103136 A EP83103136 A EP 83103136A EP 0091082 B1 EP0091082 B1 EP 0091082B1
Authority
EP
European Patent Office
Prior art keywords
contact bridge
contact
switching device
springs
contacts
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
Application number
EP83103136A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0091082A1 (de
Inventor
Karl-Erik Ing. Jönsson
Gösta Ing. Lindgren
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Publication of EP0091082A1 publication Critical patent/EP0091082A1/de
Application granted granted Critical
Publication of EP0091082B1 publication Critical patent/EP0091082B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/546—Contact arrangements for contactors having bridging contacts
    • 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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts

Definitions

  • the invention relates to an electromagnetically actuated switching device according to the first part of claim 1.
  • a switching device is known, for example, from DE-B-2 350 914.
  • the switching device can in particular be a contactor.
  • the contactors of larger contactors consist of a moving main contact and one or two fixed main contacts for each phase.
  • the contacts are usually covered with contact coatings made of a silver alloy, such as. B. silver cadmium oxide provided.
  • Silver alloys are expensive material and the cost of the contact pads is a significant part of the total cost of a contactor. It is therefore desirable to reduce the amount of silver required.
  • the springs are arranged so that they act on a contact bridge carrier attached to the magnet armature with a restoring force directed directly against the tensile force of the magnet.
  • the switch-off springs are compressed, so that the counterforce of the spring becomes larger as the magnetic air gap becomes smaller. Since the actuating magnet must additionally overcome the counterforce of the contact pressure springs during the final phase of the switch-on process, a relatively strong actuating magnet is required in the known construction. As a result, the dimensions, the price and the power requirement of the contactor are relatively large.
  • a contact arrangement is known from FIGS. 2 and 3 of DE-A-2 730 726, in which concentric contact pressure springs are used. There are no separate main contacts and arcing contacts. Rather, each contact of the contact bridge is both the main contact and the arcing contact. This ensures that, depending on the current direction just present, an arc occurs at only one of these working contacts and that this contact is simultaneously connected in series with a rectifier via another contact bridge when the switch is actuated. None is disclosed in this document about the drive of the contact arrangement.
  • the invention has for its object to develop an electromagnetically actuated switching device of the type mentioned, in which the amount of silver required for the contact system can be significantly reduced with small dimensions of the switching device.
  • an electromagnetically actuated switching device according to the preamble of claim 1 is proposed, which according to the invention has the features mentioned in the characterizing part of claim 1.
  • the arcing contact bridge closing and interrupting the main circuit and the main contact bridge carrying the predominant current, for example approx. 95%, in the stationary switched-on state, it is possible to cover the contact area of the arcing contact bridge to produce silver-free material.
  • This material can be, for example, copper cadmium oxide or copper tungsten.
  • Only the main contact bridge has a contact coating made of silver-containing material. Since the main contact bridge works almost arc-free (closes and opens), the burn-off on these contacts is very low, so that the contact pads can be relatively small. The total amount of silver for such a contactor can therefore be reduced considerably.
  • the contactor shown in the figures has three poles and is designed for a nominal voltage of 660 V, for example.
  • the rated current of the contactor can range from 40 to 800 A, for example.
  • the contactor is built on a base 1 made of die-cast light metal.
  • the base carries a holder 2 made of plastic with connecting rails 3, 4, with which it is inserted into an external main circuit.
  • the contactor of the contactor which is shown in the figures in the switched-off position, is surrounded by an arc shield 5 (FIG. 2) made of plastic, which is provided with extinguishing plates 6.
  • the contact device comprises two switching points electrically connected in series per phase, each of which is arranged in a switching chamber 7, 8 assigned to it and formed in the arc shield.
  • Each switching point has a fixed contact 9 or 10, which is attached to the connecting rail 3 or 4.
  • the fixed contacts are connected to one another in the closed contact position by a contact bridge which consists of a movable main contact bridge 11 and a movable arcing contact bridge 12.
  • the contact bridge is arranged in an opening 13 of a contact bridge carrier 14 which is connected to the armature 15 of the actuating magnet of the contactor, the magnetic core and coil of which are designated 16 and 17, respectively.
  • the armature 15 is acted upon by four return springs 18 (FIGS. 2-4). When the coil 17 is de-energized, these springs 18 press the armature 15 into the position shown in FIG. 2.
  • the contact bridges 11, 12 run between the legs 19 of a U-shaped bracket 20 which is axially movable in the contact bridge carrier 14.
  • the free ends of the bracket legs 19 are connected by a pin 21.
  • a leaf spring 22 is arranged between this pin and the movable arcing contact bridge 12.
  • two helical contact pressure springs 23, 24 with different diameters are arranged coaxially one inside the other.
  • the spring 23 with the smaller diameter is connected to the movable main contact bridge 11 via a centrally arranged pin 25, while the larger spring 24 acts on the movable arcing contact bridge 12 via the bracket 20, the pin 21 and the leaf spring 22.
  • the movable main contact bridge 11 is preferably made of copper and is provided at each end with a contact coating 26 made of a silver alloy, e.g. B. silver cadmium oxide provided.
  • a silver alloy e.g. B. silver cadmium oxide provided.
  • the movable arcing contact bridge 12 is preferably made of steel and is provided with a contact coating 27 made of silver-free contact material, e.g. B. copper cadmium oxide or copper-tungsten provided.
  • a contact coating 27 made of silver-free contact material, e.g. B. copper cadmium oxide or copper-tungsten provided.
  • the fixed contacts 9, 10 are preferably made of copper and are provided with contact pads 28, 29, which are arranged in pairs on different levels.
  • the contact pads 28 cooperate with the contact pads 26 of the movable main contact bridge 11 and consist of the same silver alloy as this.
  • the other contact pads 29 of the fixed contacts work together with the contact pads 27 of the arcing contact bridge 12 and consist of the same silver-free material as this.
  • the fixed contacts 9, 10 are also provided with arcing horns 30.
  • the return springs 18 are coil springs, each of which is arranged on a support pin 31 which is inclined in relation to the direction of movement of the contact bridge carrier 14.
  • One end of the pin 31 protrudes into a hole 32 in a bearing housing 33 and is rotatably connected at its other end to a return pin 34 via a bearing point 35.
  • the support pin 31 is pressed against the bearing point 35 by a spring 18 which is supported on the bearing housing 33 and acts on the contact bridge carrier in the contact-opening direction via the pins 31 and 34.
  • the contactor has two return pins 34, each of which is located on one side of the actuating magnet 16, 17.
  • Each of these return pins has two return springs 18 (FIG. 4) which are arranged in a V-shape in relation to one another and which are arranged on opposite sides of the return pin.
  • the tensile force of the magnet increases continuously as the magnetic air gap becomes smaller.
  • the angular position of which in relation to the return pin 34 changes with the displacement of this return pin in such a way that the component of the spring force which counteracts the magnetic force becomes smaller.
  • the movable contact device is greatly accelerated.
  • the total counterforce increases in two steps, namely that first the arcing contact bridge 12 and then the main contact bridge 11 closes.
  • the magnet must then also overcome the counterforce of the contact pressure springs 24 and 23 in addition to the counterforce of the opening springs 18.
  • the counterforce of the return springs 18 in this phase is smaller than in the fully open position of the contactor is a lower magnetic tensile force and thus a smaller contactor magnet is required than with spring arrangements known contactors.
  • the contact pads 26, 28 can therefore be small, for example less than a third of the volume of the arcing contact pads 27, 29. As a result, the amount of silver required is relatively small, which leads to a considerable reduction in the costs for the contactor.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Contacts (AREA)
EP83103136A 1982-04-06 1983-03-30 Elektromagnetisch betätigbares Schaltgerät Expired EP0091082B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE8202209 1982-04-06
SE8202210 1982-04-06
SE8202210 1982-04-06
SE8202209 1982-04-06

Publications (2)

Publication Number Publication Date
EP0091082A1 EP0091082A1 (de) 1983-10-12
EP0091082B1 true EP0091082B1 (de) 1988-08-17

Family

ID=26658136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83103136A Expired EP0091082B1 (de) 1982-04-06 1983-03-30 Elektromagnetisch betätigbares Schaltgerät

Country Status (4)

Country Link
US (1) US4496920A (fi)
EP (1) EP0091082B1 (fi)
DE (1) DE3377758D1 (fi)
FI (1) FI77746C (fi)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3819935C2 (de) * 1988-06-11 1996-06-20 Kloeckner Moeller Gmbh Hilfsschalter für ein elektromagnetisches Schaltgerät
US5454004A (en) * 1994-05-06 1995-09-26 Regents Of The University Of Minnesota Phase grating and mode-selecting mirror for a laser
US8330122B2 (en) 2007-11-30 2012-12-11 Honeywell International Inc Authenticatable mark, systems for preparing and authenticating the mark
FR3003392B1 (fr) * 2013-03-15 2016-07-22 Schneider Electric Ind Sas Bloc unitaire de commutation et dispositif de commutation comportant au moins un tel bloc

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH247323A (de) * 1945-04-14 1947-02-28 Maier & Cie C Wälzkontaktvorrichtung für elektrische Schalter.
DE1140263B (de) * 1960-12-23 1962-11-29 Bbc Brown Boveri & Cie Elektromagnetisches Schaltgeraet, insbesondere Schuetz
DE1237667B (de) * 1961-07-06 1967-03-30 Calor Emag Elek Zitaets Ag Elektromagnetisch betaetigtes Schaltgeraet, insbesondere Schuetz, bei dem die Zugkraft des Magneten ueber eine Kurvenbahn uebertagen wird
DE1894372U (de) * 1964-03-26 1964-06-11 Stotz Kontakt Gmbh Schaltgeraet, insbesondere luftschuetz fuer hohe einschaltstromspitzen.
JPS553781B2 (fi) * 1973-04-14 1980-01-26
DE2730726A1 (de) * 1977-07-07 1979-01-25 Degussa Kontaktgliedpaar und kontaktbruecke fuer wechselstromschuetze mit doppelunterbrechung
US4421959A (en) * 1982-04-19 1983-12-20 Eaton Corporation Bridging contactor with main and arcing contacts

Also Published As

Publication number Publication date
US4496920A (en) 1985-01-29
FI77746C (fi) 1989-04-10
FI831141L (fi) 1983-10-07
EP0091082A1 (de) 1983-10-12
DE3377758D1 (en) 1988-09-22
FI831141A0 (fi) 1983-04-05
FI77746B (fi) 1988-12-30

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