EP0350828A2 - Appareil d'installation électrique avec écran de séparation de contact - Google Patents

Appareil d'installation électrique avec écran de séparation de contact Download PDF

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Publication number
EP0350828A2
EP0350828A2 EP89112563A EP89112563A EP0350828A2 EP 0350828 A2 EP0350828 A2 EP 0350828A2 EP 89112563 A EP89112563 A EP 89112563A EP 89112563 A EP89112563 A EP 89112563A EP 0350828 A2 EP0350828 A2 EP 0350828A2
Authority
EP
European Patent Office
Prior art keywords
contact
arc
electrical installation
installation device
partition
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Withdrawn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
EP89112563A
Other languages
German (de)
English (en)
Other versions
EP0350828A3 (fr
Inventor
Hermann Schmitt
Dietmar Dymke
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 AG Germany
ABB AB
Original Assignee
Asea Brown Boveri AG Germany
Asea Brown Boveri 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 Brown Boveri AG Germany, Asea Brown Boveri AB filed Critical Asea Brown Boveri AG Germany
Publication of EP0350828A2 publication Critical patent/EP0350828A2/fr
Publication of EP0350828A3 publication Critical patent/EP0350828A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • 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
    • H01H9/32—Insulating body insertable between contacts

Definitions

  • the invention relates to an electrical installation device, in particular a self-switch, such as. B. Miniature circuit breakers, motor protection switches, residual current circuit breakers, with a contact point that has a fixed contact piece, which interacts with a movable contact piece that also belongs to the contact point, and with a contact partition made of insulating material that pivots between the contacts when the contact point is opened, isolating them from one another and such an elongation of an arc ignited between the contacts when they opened.
  • a self-switch such as. B. Miniature circuit breakers, motor protection switches, residual current circuit breakers
  • an electrical interrupter which has a protective wall which is arranged displaceably on a circular path and is designed as a segment of a cylinder wall. There is an opening in the middle of the protective wall, through which a movable contact piece engages in the switched-on position in order to interact with a fixed contact piece.
  • a movable flap is used to center this protective wall, which can be pivoted about a pivot point and is connected to the protective wall with its side opposite the pivot axis. With the aid of this arrangement, the space which accommodates the arrangement is divided into two volumes which are separated from one another by the flap.
  • the gases generated when the contact point is opened as a result of the arc ignited thereby are to be used and used to act on the protective wall.
  • the protective wall pivots through a certain angle, so that the opening for the contact point is displaced and the contacts are insulated from one another.
  • a very high arc voltage can be achieved with this contact arrangement, but it also has a falling characteristic as the current decreases. This can impair the ability to switch off the contact arrangement in the event of a short circuit.
  • the solution to the problem is characterized in that the contact partition has a front cutting edge which is adjacent to a contact arm carrying the movable contact piece, and is pushed between the contacts when the contact point is opened, that two insulating shields are formed on the cutting edge of the contact partition protrude beyond the contact arm on both sides and adjoin the contact point, that an arc extinguishing device is provided opposite the contact point and that the contact partition forces the entry of the switching arc thus elongated into the extinguishing device due to its swivel path.
  • the cutting edge of the contact partition thus cuts, as it were, the contact path between the contacts and lengthens the arc burning between them until it enters the quenching device.
  • an electromagnetic quick release which is composed of a coil body with a coil winding and a magnetic core and a movable armature and responds when a short-circuit current occurs.
  • the contact partition is connected to the movable armature, which acts on it and sets it in motion and at the same time ensures that the contact arm lifts the movable contact piece from the fixed contact piece and swivels it into the switched-off position.
  • the contact partition is connected to a rotary lever, one lever arm of which connects to the contact partition and the other lever arm is connected to the movable armature.
  • the additional arc extinguishing device is designed as a quenching chamber with a stack of quenching plates. It is expedient to adapt the width of the quenching chamber to the opening width of the contacts, so that a switching arc ignited when the contact point is opened safely reaches the quenching chamber.
  • the inlet opening of the arcing chamber is arranged at an angle with respect to the tangent in the common point of contact of the contact pieces.
  • a further embodiment of the invention provides that the coil of the magnetic quick release is arranged so that its external magnetic field generated when the current is flooded serves as a blowing field for blowing the arc, as a result of which the latter is acted upon in the quenching device.
  • the fixed contact piece is cylindrically curved and thus forms a defined quasi-point or line-shaped contact system for the nose-shaped movable contact piece.
  • the contact arm which is mounted in a pivot bearing, to a tension spring which acts on the movable contact piece in a bistable manner.
  • the contact spring designed as a tension spring serves both to provide the contact force and to act upon it in the off position.
  • the contact point is opened with the aid of the pivotable contact partition.
  • This strikes with its front cutting edge abruptly on the movable contact piece, so that it lifts off the fixed contact piece and the contact arm pivots towards the switch-off position.
  • the contact closing force decreases in accordance with the distance of the movable contact piece from the fixed contact piece.
  • the wall thickness of the contact partition can be dimensioned such that it approximately corresponds to the distance between the contact pieces in the dead center position of the contact arm. Due to the dynamics of the opening process described above, the contact arm then automatically swivels into the switch-off position, supported by the contact spring.
  • FIG. 1 shows a switching chamber 10 of an electrical installation device, the further details of which are not shown here, in which a contact point 12 is arranged.
  • the contact point 12 is formed from a fixed contact piece 14 and a movable contact piece 16, which is integrally formed on a pivotably mounted contact arm 18.
  • the fixed contact piece 14 is curved in a circular arc and merges into a conductor piece 15 which is connected to a coil 20 of an electromagnetic quick release device 22 arranged laterally in the switching chamber 10.
  • the electromagnetic quick release 22 has a coil body 24, which carries the coil 20 on the outside and accommodates a magnetic core 26 and a longitudinally displaceable magnet armature 28 in its interior.
  • a yoke 25 encompasses the coil body 24 on its two end faces.
  • a pin 30 is coaxially formed on the outward-facing end face of the magnet armature 28, and a plate 32 connects to its free end.
  • the pin 30 extends through a slot guide formed by two parallel holding surfaces 34, which is part of an adjusting disk 36, on the circular arc-shaped edge of which a contact partition 38 is formed orthogonally.
  • the adjusting disc 36 is pivotally mounted in a pivot point 37 and forms a pivot lever between the contact partition 38 on the one hand and the point of engagement of the plate 32 adjoining the pin 30 on the other hand via this pivot point.
  • the plate 32 lies flush against an edge of the holding wings 34 forming the pin guide.
  • the contact partition 38 has a front cutting edge 40 which is at a certain distance from the movable contact piece 16 when the contact point 12 is closed.
  • the cutting edge is surmounted on both sides by insulating shields 42, which are molded onto the contact partition 38. The distance between the insulating shields 42 is chosen so that the movable contact piece 16 can pass through the contact partition without friction.
  • the contact partition 38 has a cylindrical curvature which is adapted to the fixed contact piece 14 and connects with its one curved edge perpendicularly to the adjusting disk 36, so that the fixed contact piece 14 from two sides through the adjusting disk 36 as well as is covered by the contact partition 40.
  • the movable contact piece 16 is integrally formed on a contact arm 18, which is pivotably mounted in a bearing 19 arranged in the housing of the installation device, which is not shown here.
  • a contact spring 44 Approximately half the length of the contact arm 18 engages a contact spring 44, the abutment 46 on the tangent through the contact point 12 or above is arranged in the direction of the magnetic trigger 22.
  • the end of the movable contact piece 16 facing away from the contact point 12 is galvanically connected to a flexible conductor piece 48.
  • connection can be made by means of a plug contact or by means of a non-detachable connection, preferably spot welding.
  • a quenching chamber 50 Opposed to the movable contact piece 16, that is in FIG. 1 above the contact point 12, there is a quenching chamber 50 with a stack of quenching plates 52 which form a quenching device for the switching arc which arises when the contact point is opened.
  • the longitudinal axis of the extinguishing chamber 50 which has a rectangular cross section, is inclined against the tangent through the contact point 12.
  • One chamber wall of the extinguishing chamber 50 connects to the switching chamber 10 where it is cut by the tangent through the contact point 12.
  • the opposite parallel chamber wall of the arcing chamber 50 connects to the switching chamber 10 where the movable contact piece 16 is in its switched-off position.
  • the tangent already mentioned, which is placed through the contact point 12, can be referred to as the main axis of the switching chamber 10.
  • the inclination of the quenching chamber 50 with respect to the main axis of the switching chamber 10 can be between 10 and 20 degrees. It has proven to be advantageous to determine the inclination so that the longitudinal axis of the extinguishing chamber 50 forms a right angle with a straight line which intersects the open contact pieces 14, 16 in their contact points 15, 17. Accordingly, in the example shown in FIG. 2, the inclination of the arcing chamber 50 is approximately 15 degrees.
  • FIG. 2 the arrangement already known from FIG. 1 is also shown in longitudinal section, the contacts 14, 16 here being open, in contrast to the illustration shown in FIG. 1, and the movable contact piece 16 being in the switched-off position.
  • the movable contact piece 16 is in its switched-off position, the line of action of the contact spring 44 acting on the contact arm 18 also having undergone a pivoting movement in accordance with the pivoting of the movable contact piece 16 and now exerting a moment on the contact arm 18 in a clockwise direction.
  • the contact arm 18 with the movable contact piece 16 passes through a dead center, in which the longitudinal axis of the contact arm 18 and the line of action of the clock spring 44 coincide. Due to the dynamics of the opening process of the movable contact piece 16, however, the latter does not maintain this unstable position but swivels completely into the switch-off position, into which it is acted upon by the contact spring 44.
  • the actuation of the contact arrangement 14, 16 shown in FIG. 1 and FIG. 2 is initiated by the magnetic release 22, which immediately pulls the armature 28 when a short-circuit current occurs. This in turn acts on the adjusting disc 36 on its retaining wings 34 and pivots them counterclockwise, as a result of which the contact partition 38 connected to the adjusting disc 36 strikes the movable contact piece.
  • the front cutting edge 40 of the contact partition 38 is at a certain distance from the movable contact piece 16. This distance serves to enable the contact separation wall 38 connected to the adjusting disk 36 to start accelerating, on the basis of which the movable contact piece 16 counteracts the closing force of the Contact spring 44 can be opened and pivots in the direction of the switch-off position.
  • the cutting edge 40 of the contact partition 38 is chamfered in a wedge shape so that it lifts the movable contact piece 16 off the fixed contact piece 14 like a wedge. Furthermore, it is expedient if the thickness of the contact partition 38 is selected such that the movable contact piece 16 thereby at least reaches its previously described dead center position, from which it pivots into its switch-off position due to the opening dynamics.
  • the holding wings 34 of the adjusting disk 36 have two contact surfaces which are bevelled at an angle to one another for the plate 32, which transmits the actuating force of the magnet armature 28 to the adjusting disk 36.
  • the contact surfaces are arranged so that the contact partition 38 is flush both in the switched-on position and in the switched-off position.
  • a torsion spring can also be provided, which acts on the adjusting disk 36, which in turn via the holding wings 34, the plate 32 and the pin 30, the magnet armature 28 into its rest position shown in FIG. 1 acted upon.
  • the essential meaning of the arrangement described above is that when a short-circuit current occurs, which leads to the triggering of the electromagnetic quick release and thus to the opening of the contact point 12, a switching arc ignited between the contact pieces 14, 16 is lengthened on the one hand by the contact partition 38 which moves in between and on the other hand, due to the geometrical conditions with regard to the arrangement of the extinguishing chamber 50, it is passed into it, where it goes out.
  • the wedge-like configuration of the cutting edge 40 of the contact partition 38 also favors a constriction of the switching arc, as a result of which a further current limitation is achieved.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
EP19890112563 1988-07-14 1989-07-10 Appareil d'installation électrique avec écran de séparation de contact Withdrawn EP0350828A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883823790 DE3823790A1 (de) 1988-07-14 1988-07-14 Elektrisches installationsgeraet mit kontakttrennwand
DE3823790 1988-07-14

Publications (2)

Publication Number Publication Date
EP0350828A2 true EP0350828A2 (fr) 1990-01-17
EP0350828A3 EP0350828A3 (fr) 1991-01-02

Family

ID=6358611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890112563 Withdrawn EP0350828A3 (fr) 1988-07-14 1989-07-10 Appareil d'installation électrique avec écran de séparation de contact

Country Status (2)

Country Link
EP (1) EP0350828A3 (fr)
DE (1) DE3823790A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232888A1 (de) * 1991-09-30 1993-04-01 Elektroelement Izlake D D Kontakt-schaltlichtbogensystem eines leitungsschutzschalters
DE4234065C1 (de) * 1992-10-09 1993-12-02 Eti Elektroelement Dd Schaltgerät
DE19726402A1 (de) * 1997-06-21 1998-12-24 Marquardt Gmbh Elektrischer Schalter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19710880B4 (de) * 1997-03-15 2007-11-15 Moeller Gmbh Lichtbogenlöscheinrichtung
DE19735521A1 (de) * 1997-08-16 1999-02-18 Kloeckner Moeller Gmbh Lichtbogenlöscheinrichtung für einen kurzschlußstrombegrenzenden Niederspannungsschalter

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR849484A (fr) * 1939-11-24
US1833173A (en) * 1928-07-10 1931-11-24 Metropolitan Device Corp Circuit breaking apparatus
DE1104019B (de) * 1959-09-11 1961-04-06 Continental Elektro Ind Ag Lichtbogenloeschkammer fuer elektrische Leistungsschalter
US3978300A (en) * 1975-02-11 1976-08-31 Westinghouse Electric Corporation Low-voltage circuit-breaker having small contact separation and small gap between cooperating parallel-arranged arcing-rails
DE3247681A1 (de) * 1982-12-23 1984-06-28 Brown, Boveri & Cie Ag, 6800 Mannheim Lichtbogenloeschkammer
FR2540665B1 (fr) * 1983-02-04 1987-02-27 Telemecanique Electrique Dispositif interrupteur muni d'un ecran isolant s'interposant entre les contacts lors de la coupure et de moyen de cisaillement de l'arc entre cet ecran et une paroi isolante
FR2540667B1 (fr) * 1983-02-08 1986-06-13 Telemecanique Electrique Interrupteur de protection automatique a sectionnement visible et a rearmement manuel
FR2563939B1 (fr) * 1984-05-03 1988-03-18 Telemecanique Electrique Dispositif interrupteur a ecran de coupure d'arc
FR2573914B1 (fr) * 1984-11-26 1987-02-06 Telemecanique Electrique Interrupteur electrique a ecran
FR2573913B1 (fr) * 1984-11-26 1987-01-09 Telemecanique Electrique Interrupteur electrique a ecran
FR2575589B1 (fr) * 1984-12-28 1987-02-06 Telemecanique Electrique Interrupteur electrique a ecran
FR2596196B1 (fr) * 1986-03-21 1988-08-26 Telemecanique Electrique Appareil interrupteur de protection muni d'un ecran de coupure d'arc
DE3770516D1 (de) * 1986-04-04 1991-07-11 Telemecanique Electrique Elektrischer schalter fuer schutzgeraet, wie schutzschalter.
FR2596916B1 (fr) * 1986-04-04 1988-06-10 Telemecanique Electrique Disjoncteur bipolaire a ouverture automatique ou manuelle avec electro-aimant bistable et noyau percuteur magnetisable
DE3619241C2 (de) * 1986-06-07 1994-07-21 Kloeckner Moeller Gmbh Löscheinrichtung für einen Leitungsschutzschalter
DE3625425A1 (de) * 1986-07-28 1988-02-04 Bbc Brown Boveri & Cie Leitungsschutzschalter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232888A1 (de) * 1991-09-30 1993-04-01 Elektroelement Izlake D D Kontakt-schaltlichtbogensystem eines leitungsschutzschalters
DE4234065C1 (de) * 1992-10-09 1993-12-02 Eti Elektroelement Dd Schaltgerät
EP0592007A1 (fr) * 1992-10-09 1994-04-13 Eti Elektroelement D.D. Dispositif de commutation
DE19726402A1 (de) * 1997-06-21 1998-12-24 Marquardt Gmbh Elektrischer Schalter
US6025568A (en) * 1997-06-21 2000-02-15 Marquardt Gmbh Electric switch
DE19726402B4 (de) * 1997-06-21 2009-03-05 Marquardt Gmbh Elektrischer Schalter

Also Published As

Publication number Publication date
DE3823790A1 (de) 1990-01-18
EP0350828A3 (fr) 1991-01-02

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