EP0050187B1 - Disjoncteur de protection de courant de surintensité - Google Patents

Disjoncteur de protection de courant de surintensité Download PDF

Info

Publication number
EP0050187B1
EP0050187B1 EP81104965A EP81104965A EP0050187B1 EP 0050187 B1 EP0050187 B1 EP 0050187B1 EP 81104965 A EP81104965 A EP 81104965A EP 81104965 A EP81104965 A EP 81104965A EP 0050187 B1 EP0050187 B1 EP 0050187B1
Authority
EP
European Patent Office
Prior art keywords
contact piece
movable contact
locking bar
switch according
protective switch
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
EP81104965A
Other languages
German (de)
English (en)
Other versions
EP0050187A3 (en
EP0050187A2 (fr
Inventor
Adrian W. Dr. Roth
Tibor Morva
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.)
Rockwell Automation Switzerland GmbH
Original Assignee
Sprecher und Schuh 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 Sprecher und Schuh AG filed Critical Sprecher und Schuh AG
Publication of EP0050187A2 publication Critical patent/EP0050187A2/fr
Publication of EP0050187A3 publication Critical patent/EP0050187A3/de
Application granted granted Critical
Publication of EP0050187B1 publication Critical patent/EP0050187B1/fr
Expired 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
    • H01H71/24—Electromagnetic mechanisms
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
    • 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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements

Definitions

  • the invention relates to an overcurrent circuit breaker with a movable contact piece, which engages in the switched-on position with a fixed contact piece, and which is under the action of the same urging force in the switched-off position, and with an overcurrent release lock, by means of which the movable contact piece in Switch-on position can be locked.
  • overcurrent circuit breakers are often installed instead of fuses, which are known to be used only once, in medium and high voltage electrical switchgear to protect them from, for example, short-circuit currents.
  • the spring-loaded, movable contact piece is coupled to the lock via a lever mechanism, which in turn has a latch mechanism.
  • the ratchet mechanism is associated with an electromagnet which has a movable armature which interacts with the ratchet mechanism, and the excitation winding of which consists of a few turns of a conductor which is connected in series with the movable contact piece. If an excess current, for example a short-circuit current, flows through this conductor, the attraction force of the electromagnet on the armature is sufficient to unlock the pawl mechanism. The movable contact piece is then free to move to the off position under the action of the spring.
  • the known circuit breaker has numerous mechanically movable parts and also numerous pivot pins. Over a long period of time, this affects the functional safety of the circuit breaker. In addition, this contradicts the attempt to manufacture such circuit breakers as simply and therefore cheaply, but without loss of functionality.
  • the excitation winding of the magnet which always carries current in the switched-on position, continuously generates waste heat which is to be dissipated.
  • This can be done either by direct cooling measures, or - as with the previously known switch - by arranging the elements of the switch in a comparatively large interior, which ensures a sufficient circulation of the medium contained therein for cooling.
  • the locking device has a substantially U-shaped bar, which encompasses the movable contact piece with play and is displaceably mounted transversely to the flow of current, made of a soft magnetic material, at least one of which the free leg ends of which are provided with a stop which, in the switched-on position, cooperates with a stop nose which is movable with the movable contact piece.
  • the overcurrent circuit breaker 10 shown has a switch housing 11 which has an insulating tube 12 which is sealed at the top by a cap 13.
  • a first connecting conductor 14 starts from the cap 13, which in turn carries a fixed contact piece 15, only schematically shown, on its inside.
  • At the lower end of the insulating tube 12 there is a sealing part 16 in the form of a pot or cup open at the bottom, from which a second connecting conductor 23 extends.
  • the end wall 17 of the end part 16 adjoining the insulating tube 12 has through bores 18, of which the middle one - as will be explained later - serves for the passage of a movable contact piece.
  • a metallic bellows 19 is fastened in a sealing manner, which is in turn sealed by an end plate 20.
  • a rod-shaped, movable contact piece 21 is fastened, which extends through the bellows 19 and through the central bore 18.
  • the interior 22 of the switch housing 11 is completely gas-tightly encapsulated from the outside.
  • This interior space 22 can be filled with an extinguishing gas which is under pressure, for example SF 6 , and which therefore endeavors to follow the bellows 19 to expand below, ie to bring the movable contact piece 21 into the switched-off position.
  • a compression spring 24 supported on one end on the end plate 20 and on the other end on the end wall 17 can be provided in the bellows 19.
  • sliding contacts 25 are provided on the outside of the movable contact piece 21, which ensure the electrical connection between this contact piece 21 via the end part 16 and the connecting conductor 23.
  • the movable contact piece 21 is normally and against the force emanating from the excess pressure in the interior 22 and / or from the spring 24 by means of a lock designated 26 in the switched-on position shown on the left in FIG. 1.
  • a lock designated 26 for a more detailed explanation of this lock 26, reference is now made to FIGS. 2 and 3.
  • the latch 26 has an essentially U-shaped or - more precisely - horseshoe-shaped latch 27 (FIG. 2) made of a soft magnetic material, which engages around the movable contact piece 21 with play.
  • This bolt 27 is displaceable in a direction transverse to the flow of current in the movable contact piece 21 and can be guided for this purpose by a protective bearing sleeve 28 (FIG. 3) which is interspersed with play by the movable contact piece 21.
  • This bearing sleeve 28 or the bolt 27 (if no bearing sleeve is provided) is supported on a cross member 29 which bridges the interior 22 and is fastened to the inner wall of the insulating tube 12.
  • Both free leg ends 30, 31 of the bolt 27 have stop surfaces (only the stop surface 32 of the leg end 30 is visible in FIG. 5), on which, in the switched-on position, the stop surface 33 of a molded or movable contact piece 21 attached stop nose 34 rests.
  • the yoke 35 of the bolt i. H. the section of the bolt connecting the two legs, at a greater distance from the movable contact piece 21 than the two free leg ends 30, 31.
  • This magnetic field is particularly pronounced in the magnetic circuit given by the bolt 27 and has the result that forces act on the bolt 27 which endeavor to displace it with respect to the movable contact piece 21 such that the magnetic resistance of the magnetic Circle is the lowest.
  • This magnetic resistance is lowest when the movable contact piece 21 is in the vicinity of the yoke 35. Forces (as long as the movable contact piece carries current) therefore always act on forces which endeavor to move the bolt to the left in FIGS. 1, 2 and 5 (position shown in broken lines in FIG. 2), so that the free ones Leg ends 30, 31 release the stop lug 34 and thus the movable contact piece 21 for executing the switch-off stroke.
  • means can be provided to apply a restoring force, ie. H. 1, 2 and 5 to exert a force acting to the right.
  • a restoring force ie. H. 1, 2 and 5 to exert a force acting to the right.
  • These means can be formed by a compression spring 36 (only shown in FIG. 1) and / or by a permanent magnet 37 which is attached to the outside of the insulating tube 12 at the level of the latch 27 or can be advanced to this point as required.
  • the bolt is to be pushed back into its starting position, which is done either by the spring 36 and / or the magnet 37 as soon as the switching arc has been extinguished, ie. H. the overcurrent has stopped flowing. Then, by exerting force on the end plate 20, the bellows 19 is pressed together and thus the movable contact piece 21 is displaced onto the fixed contact piece 15. In this case, a deflecting surface 40 formed on the side of the stop lug 34 opposite the stop surface 33 hits the bolt 27 in the starting position, displaces it temporarily until the stop lug has again reached a position between the fixed contact piece 15 and the locking device 26. The bolt 27 can now return to its initial position, and thus the movable contact piece 21 is locked in the switch-on position.
  • the side of the end plate 20 facing away from the bellows 19 can have a striking color or can be provided with other suitable markings.
  • FIG. 4 differs from that of FIGS. 1-3 in that the bolt 27 is purely U-shaped.
  • the free leg ends 30, 31 of the bolt 27 are connected to one another by a stop element 41 made of a non-magnetizable material, against which the stop lug 34 abuts in the switched-on position.
  • This stop element 34 can be formed by a rotatable roller or can also have a prismatic shape.
  • the stop surface 33 of the stop nose 34 can be given an inclination a, which leads to the effect on the movable contact piece 21 Force P a force acting on the bolt 27 of the force Q is generated. In this case too, the inclination a of the stop surface 33 is decisive for the response threshold of the circuit breaker.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Claims (13)

1. Disjoncteur de surintensité comportant un élément de contact mobile (21) qui, dans la position en circuit, est en prise avec un élément de contact fixe (15), et qui est soumis à l'action d'une force le poussant en position hors circuit, et un verrouillage (26) pouvant être dégagé par une surintensité, au moyen duquel l'élément de contact mobile (21) peut être bloqué en position en circuit, caractérisé en ce que le verrouillage (26) comporte un verrou (27) sensiblement en forme de U, entourant avec jeu l'élément de contact mobile (21), pouvant être déplacé sur le passage du courant transversalement à celui-ci et constitué par un matériau magnétique doux, au moins une des extrémités de ses branches libres (30, 31) étant munie d'une butée (32 ; 41), qui dans la position en circuit, coopère avec un bec de butée (34) qui se déplace en même temps que l'élément de contact mobile (21).
2. Disjoncteur de surintensité selon la revendication 1, caractérisé en ce que le verrou (27) est en forme de fer à cheval et que les deux extrémités de ses branches libres (30, 31) sont munies de surfaces de butée (32) (fig. 1, 2).
3. Disjoncteur de surintensité selon la revendication 1, caractérisé en ce que la butée du verrou (27) est constituée par un élément de butée (41) en un matériau non magnétisable reliant les extrémités libres des branches (30, 31) du verrou (fig. 4).
4. Disjoncteur de surintensité selon la revendication 3, caractérisé en ce que l'élément de butée est constitué par un cylindre de butée tournant librement.
5. Disjoncteur de surintensité selon la revendication 1, caractérisé en ce que le verrou (27) est monté de façon à pouvoir se déplacer contre l'action d'une force de rappel.
6. Disjoncteur de surintensité selon la revendication 5, caractérisé en ce que le bec de butée (34) comporte une surface de butée (33) et une surface inclinée (40) lui faisant face.
7. Disjoncteur de surintensité selon la revendication 5, caractérisé en ce qu'on prévoit un aimant (37) pour exercer la force de rappel sur le verrou (27).
8. Disjoncteur de surintensité selon la revendication 5, caractérisé en ce qu'on prévoit un ressort (36) pour exercer la force de rappel sur le verrou (27).
9. Disjoncteur de surintensité selon la revendication 4, caractérisé en ce que la surface de butée (33) du bec de butée (34) présente une inclinaison (a) s'opposant à la force (Q) produite dans l'élément de contact (21) par le passage du courant et agissant sur le verrou (27).
10. Disjoncteur de surintensité selon les revendications 2 et 9, caractérisé en ce que les surfaces de butée (32) aux extrémités libres des branches (30,31) du verrou (27) sont inclinées de la même façon que la surface de butée (33) du bec de butée (34).
11. Disjoncteur de surintensité selon la revendication 1, caractérisé en ce que le verrou (27) est guidé de façon à pouvoir se déplacer dans un manchon de positionnement (28) traversé avec jeu par l'élément de contact mobile (21).
12. Disjoncteur de surintensité selon l'une des revendications 1 à 11, caractérisé par un boîtier de disjoncteur (11) tubulaire, étanche, contenant un gaz d'extinction en surpression, lequel boïtier est fermé à une extrémité par un capuchon (13) portant l'élément de contact fixe (15) et à l'autre extrémité par un soufflet (19) extensible fermé par une plaque (20), sur laquelle est fixé l'élément de contact (21) qui pénètre dans le boîtier de disjoncteur (11) et est monté sur le verrou (27) sensiblement en forme de U de façon à pouvoir s'y déplacer longitudinalement, grâce à une plaque de guidage (29) se trouvant dans le boîtier de disjoncteur (11).
13. Disjoncteur de surintensité selon la revendication 12, caractérisé en ce qu'on prévoit entre la plaque de guidage (29) et l'élément de contact fixe (15) une buse soufflante (38) fixée dans le boîtier (11) et fermée, en position en circuit, par l'élément de contact mobile (21).
EP81104965A 1980-10-17 1981-06-26 Disjoncteur de protection de courant de surintensité Expired EP0050187B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7766/80 1980-10-17
CH776680 1980-10-17

Publications (3)

Publication Number Publication Date
EP0050187A2 EP0050187A2 (fr) 1982-04-28
EP0050187A3 EP0050187A3 (en) 1983-02-09
EP0050187B1 true EP0050187B1 (fr) 1985-02-20

Family

ID=4330158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81104965A Expired EP0050187B1 (fr) 1980-10-17 1981-06-26 Disjoncteur de protection de courant de surintensité

Country Status (3)

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US (1) US4388507A (fr)
EP (1) EP0050187B1 (fr)
DE (1) DE3169025D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0622087B2 (ja) * 1987-05-25 1994-03-23 松下電工株式会社 封止接点装置
FR2756968B1 (fr) * 1996-12-09 1999-01-08 Gec Alsthom T & D Sa Disjoncteur a volume de sf6 reduit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757261A (en) * 1951-07-19 1956-07-31 Westinghouse Electric Corp Circuit interrupters
US3002073A (en) * 1958-04-16 1961-09-26 Gen Electric Electric circuit interruption device and method
US3263042A (en) * 1963-02-18 1966-07-26 Westinghouse Electric Corp Electric control device with electromagnetic contact-biasing means
DE2503910C3 (de) * 1975-01-31 1980-11-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Autopneumatischer Druckgasschalter
US4220935A (en) * 1978-10-16 1980-09-02 Westinghouse Electric Corp. Current limiting circuit breaker with high speed magnetic trip device

Also Published As

Publication number Publication date
EP0050187A3 (en) 1983-02-09
US4388507A (en) 1983-06-14
EP0050187A2 (fr) 1982-04-28
DE3169025D1 (en) 1985-03-28

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