EP0050187A2 - Disjoncteur de protection de courant de surintensité - Google Patents

Disjoncteur de protection de courant de surintensité Download PDF

Info

Publication number
EP0050187A2
EP0050187A2 EP81104965A EP81104965A EP0050187A2 EP 0050187 A2 EP0050187 A2 EP 0050187A2 EP 81104965 A EP81104965 A EP 81104965A EP 81104965 A EP81104965 A EP 81104965A EP 0050187 A2 EP0050187 A2 EP 0050187A2
Authority
EP
European Patent Office
Prior art keywords
contact piece
stop
movable contact
circuit breaker
bolt
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.)
Granted
Application number
EP81104965A
Other languages
German (de)
English (en)
Other versions
EP0050187B1 (fr
EP0050187A3 (en
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 with a fixed contact piece in the switched-on position and which is under the action of a force urging it into the switched-off position, and with an interlock that can be released by overcurrent, by means of which the movable switch piece in Switch-on position can be locked.
  • overcurrent circuit breakers are often installed in electrical switchgear of the medium and high voltage in order to protect them against, for example, short-circuit currents, instead of fuses, which are known to be used only once.
  • 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 attractive force of the electromagnet on the armature is sufficient to unlock the latch 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 the disadvantage that it is not insignificant for such switches that it has numerous, mechanically movable and also numerous pivot pins. This fact affects the functional safety of the circuit breaker when viewed over a long period of time. In addition, this fact stands in the way of trying 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 either be done by direct cooling measures or - as with the previously known switch, in that the elements of the switch are arranged in a comparatively large interior, which ensures sufficient circulation of the medium contained therein for cooling.
  • the locking device has a substantially U-shaped bar made of a soft magnetic material which encompasses the movable contact piece with play and is displaceably mounted transversely to the flow of current in the same, at least one having its free leg ends a stop is provided which cooperates in the switched-on position with a stop lug which is movable with the movable contact piece.
  • the overcurrent protection switch 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 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 which is open at the bottom and from which a second connecting conductor 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 one Bellows 19 sealingly attached, which in turn is sealed by an end plate 20.
  • a compression spring 24 supported at one end on the end plate 20 and at 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 overall by 26 in the left side in FIG. 1 turned on locked position.
  • a lock designated overall by 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 bridging the interior 22 and fastened to the inner wall of the insulating tube 12.
  • Both free leg ends 30, 31 of the latch 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 27 is located, i.e. 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 effect that the 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 circuit 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.
  • the response threshold of the overcurrent circuit breaker can be d-determined, for example, by a suitable choice of the inclination.
  • means can be provided in order to exert a restoring force on the bolt 27, ie a force acting to the right in the illustration in FIGS. 1, 2 and 5. These means can be formed by a compression spring 36 (only shown in FIG. 1) and / or by a permanent magnet 37 which is fastened 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 must 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 is extinguished, i.e. the overcurrent has stopped flowing. Then, by exerting force on the end plate 20, the bellows 19 is compressed 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.
  • the embodiment of Fig. 4 differs from that 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 ⁇ , 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 ⁇ of the stop surface 33 is decisive for the response threshold of the circuit breaker.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Breakers (AREA)
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
CH776680 1980-10-17
CH7766/80 1980-10-17

Publications (3)

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

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2616008A1 (fr) * 1987-05-25 1988-12-02 Matsushita Electric Works Ltd Appareil de coupure etanche a l'air comportant des moyens de soufflage d'arc
FR2756968A1 (fr) * 1996-12-09 1998-06-12 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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2616008A1 (fr) * 1987-05-25 1988-12-02 Matsushita Electric Works Ltd Appareil de coupure etanche a l'air comportant des moyens de soufflage d'arc
GB2206238A (en) * 1987-05-25 1988-12-29 Matsushita Electric Works Ltd Arc control and biasing of sealed contact device
GB2206238B (en) * 1987-05-25 1991-12-11 Matsushita Electric Works Ltd Sealed contact device
FR2756968A1 (fr) * 1996-12-09 1998-06-12 Gec Alsthom T & D Sa Disjoncteur a volume de sf6 reduit

Also Published As

Publication number Publication date
EP0050187B1 (fr) 1985-02-20
DE3169025D1 (en) 1985-03-28
US4388507A (en) 1983-06-14
EP0050187A3 (en) 1983-02-09

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