EP0560665B1 - Trägheitskontakt - Google Patents

Trägheitskontakt Download PDF

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Publication number
EP0560665B1
EP0560665B1 EP93400597A EP93400597A EP0560665B1 EP 0560665 B1 EP0560665 B1 EP 0560665B1 EP 93400597 A EP93400597 A EP 93400597A EP 93400597 A EP93400597 A EP 93400597A EP 0560665 B1 EP0560665 B1 EP 0560665B1
Authority
EP
European Patent Office
Prior art keywords
contact
inertia
tube
contact according
inertia contact
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
EP93400597A
Other languages
English (en)
French (fr)
Other versions
EP0560665A1 (de
Inventor
Michel Perret
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.)
Grid Solutions SAS
Original Assignee
GEC Alsthom T&D SA
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 GEC Alsthom T&D SA filed Critical GEC Alsthom T&D SA
Publication of EP0560665A1 publication Critical patent/EP0560665A1/de
Application granted granted Critical
Publication of EP0560665B1 publication Critical patent/EP0560665B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H33/16—Impedances connected with contacts
    • H01H33/168—Impedances connected with contacts the impedance being inserted both while closing and while opening the switch

Definitions

  • the present invention relates to an inertial contact according to the preamble of claim 1.
  • the invention finds a use in particular in high voltage circuit breakers of the type in which a resistor or a varistor is inserted, for a fairly short time, in parallel on the terminals of the arcing contacts, on opening or closing. of the circuit breaker.
  • FIG. 1 of this specification shows the device of the prior art.
  • a circuit breaker breaking chamber comprising a sealed ceramic envelope 1, defining a volume 2 filled with gases with good dielectric properties under pressure.
  • the envelope closed at its upper part by a metal flange 3, contains a fixed assembly comprising a first metal tube 6 constituting the fixed main contact, a second metal tube 7 constituting the fixed arcing contact and contact arms 31 connected at one end 20 of a varistor consisting of a stack of discs 18 disposed in an insulating cylinder 19.
  • the end 31A of the arms 31 is made of an alloy resistant to the effects of the electric arc.
  • the second end of the varistor, as well as the fixed permanent contacts and the fixed arcing contacts are electrically connected, by arms 5, to a first socket 4 of the circuit breaker.
  • the mobile assembly of the circuit breaker comprises a cylinder 9 mechanically connected to an operating rod not shown and electrically to a second socket not shown.
  • a part 11 serving to support fingers 12 constituting the movable permanent contact, fingers 14 constituting the movable arcing contact and arranged at the end of a tube 13, and a blowing nozzle 17.
  • a cover 10 protects the fingers 12 against the smell. Holes 15 in part 11 ensure the passage of blowing gas.
  • the varistor is inserted in parallel on the arcing contacts, at the opening of the circuit breaker, by a contact 43 in the form of a rod, which can slide in a guide block 30 fixed to the cylinder 9 and comprising a cavity 32 in which s supports the first end of a spring 34 surrounding the rod 43, and the other end of which abuts on a damping block 40 fixed to the end of the rod.
  • the rod 43 When the circuit breaker opens, by movement of the moving element, the rod 43, due to its inertia, remains stationary for a few moments, against the pressure of the spring which is compressed; this allows the varistor to be inserted after separation of the arcing contacts, for the time necessary for the varistor to attenuate any overvoltages.
  • the spring When the spring is fully compressed, the rod is driven by the movement of the cylinder 9 and leaves the contact 31.
  • the device which has just been described does not have a dielectric profile which is suitable for a very high voltage device.
  • An object of the present invention is to provide a set of contacts having a favorable dielectric profile.
  • Another object of the invention is to provide a set of contacts of reduced bulk, in particular in the axial direction, which can find a place in a breaking chamber without the need to increase its dimensions and in particular its diameter. .
  • the subject of the invention is an inertia contact, intended to cooperate with a contact in series with a component, such as a resistor or a varistor, placed in the breaking chamber of a circuit breaker to be inserted during a limited time in parallel on the contacts of the circuit breaker, the latter comprising a tube supporting movable contacts and connected to an operating rod, characterized in that it comprises a metallic envelope of revolution, coaxial with said tube and surrounding the latter, in shape substantially tubular with a protrusion framed by two soft friction supports on said tube, a first end of said insertion contact being made of an alloy resistant to the effects of an arc, a second end of said insertion contact serving to fix a first end of at least one spring, a second end of which is fixed to said tube, a ring with conical inner section being arranged at one end of the cavity formed by said protuberance and cooperating with a convex collar fixed to said tube for damping the movement relative between said inertial contact and said tube.
  • a component such as
  • the inertial contact comprises three springs arranged parallel to each other at 120 degrees from each other.
  • the domed collar carries two O-rings arranged in planes perpendicular to the axis of the insertion contact.
  • the O-rings are made of elastomer.
  • Said ring is preferably made of synthetic material such as polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the metal envelope constituting the inertia contact is advantageously made in two parts which can be screwed to each other.
  • said ring is clamped between a step formed by one of said parts and an O-ring bearing on the bottom of the cavity delimited by the protuberance.
  • Said O-ring is advantageously made of elastomer.
  • FIGS. 2 to 4 and to FIG. 1 have been given the same reference numbers.
  • the reference 13 designates the tube which carries the fingers 14 constituting the movable main contact protected by the corona hood 10.
  • the insertion contact is a metal part of revolution having a substantially tubular shape with a protuberance 51.
  • the metal part is supported by gentle friction in two places 52 and 53 framing the protuberance against the tube 13 supporting the main contact consisting of the fingers 14. It carries at one end 54 lugs to allow the first end of springs such as 55 to be fixed, the second end of which is fixed to lugs such as 56 secured to the tube 13.
  • springs parallel to each other and at 120 degrees the each other, each spring having a low force of the order of 10 daN for example.
  • a ring 57 coaxial with the tube 13 and whose inner surface is conical; this ring, made of synthetic material such as polytetrafluoroethylene (PTFE), is contiguous with an O-ring 58 made of elastomer resting on the end 51A of the protuberance of the insertion contact 50.
  • the contact is made in two parts 50A and 50B carrying end threads enabling them to be screwed together.
  • the ring 57 is clamped between the seal 58 and the shoulder formed by the end of the part 50A.
  • the other end 50A 'of the part 50A is made of an alloy resistant to the effects of the arc.
  • the ring 57 cooperates with a collar 60 integral with the tube 13, of convex shape and carrying notches in which are placed O-rings 61 and 62 emerging slightly from the collar and arranged in planes perpendicular to the axis of the inertia contact.
  • These O-rings are preferably made of elastomer.
  • the component When the insertion contact is closed, the component is inserted as soon as the contacts 50A ′ and 31A touch each other, until these contacts are short-circuited by bringing the arcing contacts into contact.
  • the O-ring 61 serves to absorb the shock between the collar 60 and the part 50A of the contact 50, at the end of the triggering operation, when the tube 13 is stopped.
  • the insertion contact of the invention is of simple and economical construction. It has a profile perfectly adapted to the dielectric requirements inside the breaking chamber. It has a very small radial size, so that it can be installed in already existing switching chambers.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)

Claims (8)

  1. Trägheitskontakt, der mit einem Kontakt in Reihe mit einem Bauelement, wie z.B. einem Widerstand oder einem Varistor zusammenwirken soll, der in der Trennkammer eines Schalters angeordnet ist, um während einer begrenzten Zeit parallel zu den Kontakten (6, 12; 7, 14) des Schalters eingefügt zu werden, wobei dieser Schalter ein Rohr (13) aufweist, das bewegliche Kontakte trägt und mit einem Betätigungsstab verbunden ist, dadurch gekennzeichnet, daß er eine drehsymmetrische metallische Hülle (50) aufweist, die zum Rohr (13) koaxial liegt und dieses umgibt, wobei die Hülle im wesentlichen rohrförmig ist und einen erweiterten Bereich (51) zwischen zwei Auflagen (52, 53) besitzt, die mit leichter Reibung auf dem Rohr aufliegen, wobei ein erstes Ende (50A') dieser Hülle aus einer Legierung ist, die den Lichtbogenwirkungen widersteht, während ein zweites Ende (54) der Befestigung an einem ersten Ende mindestens einer Feder (55) dient, deren zweites Ende am Rohr (13) befestigt ist, daß ein Ring (57) mit konischem Innenquerschnitt an einem Ende eines Raums angeordnet ist, der von diesem erweiterten Bereich gebildet wird, und zur Dämpfung der Relativbewegung zwischen dem Trägheitskontakt und dem Rohr mit einem gewölbten Kragen (60) zusammenwirkt, der am Rohr befestigt ist.
  2. Trägheitskontakt nach Anspruch 1, dadurch gekennzeichnet, daß der Trägheitskontakt drei Federn (55) besitzt, die parallel zueinander und mit einem gegenseitigen Abstand von 120° angeordnet sind.
  3. Trägheitskontakt nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der gewölbte Kragen (60) zwei Torusringe (61, 62) trägt, die in Ebenen senkrecht zur Achse des Einfügekontakts angeordnet sind.
  4. Trägheitskontakt nach Anspruch 3, dadurch gekennzeichnet, daß die Torusringe aus Elastomermaterial bestehen.
  5. Trägheitskontakt nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Konusring (57) aus Kunststoffmaterial wie z.B. Polytetrafluoräthylen (PTFE) besteht.
  6. Trägheitskontakt nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die den Trägheitskontakt bildende metallische Hülle (50) aus zwei Teilen (50A, 50B) besteht, die aneinandergeschraubt werden können.
  7. Trägheitskontakt nach Anspruch 6, dadurch gekennzeichnet, daß der Konusring (57) zwischen eine an einem der beiden Teile (50A) gebildete Schulter und eine Ringdichtung (58) eingeklemmt ist, die sich auf dem Boden des Raums abstützt, der vom erweiterten Bereich (51) begrenzt wird.
  8. Trägheitskontakt nach Anspruch 7, dadurch gekennzeichnet, daß die Ringdichtung (58) aus Elastomermaterial besteht.
EP93400597A 1992-03-10 1993-03-08 Trägheitskontakt Expired - Lifetime EP0560665B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9202837A FR2688624A1 (fr) 1992-03-10 1992-03-10 Contact a inertie pour disjoncteur permettant l'insertion temporaire d'une impedance.
FR9202837 1992-03-10

Publications (2)

Publication Number Publication Date
EP0560665A1 EP0560665A1 (de) 1993-09-15
EP0560665B1 true EP0560665B1 (de) 1997-04-16

Family

ID=9427530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93400597A Expired - Lifetime EP0560665B1 (de) 1992-03-10 1993-03-08 Trägheitskontakt

Country Status (6)

Country Link
US (1) US5302784A (de)
EP (1) EP0560665B1 (de)
CA (1) CA2091321C (de)
DE (1) DE69309759T2 (de)
ES (1) ES2099920T3 (de)
FR (1) FR2688624A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6316742B1 (en) 1999-07-14 2001-11-13 Southern States, Inc. Limited restrike circuit interrupter used as a line capacitor and load switch
US6236010B1 (en) 1999-07-14 2001-05-22 Southern States, Inc. Circuit interrupter including a penetrating electrical contact with grip and release structure
FR2957451A1 (fr) * 2010-03-09 2011-09-16 Areva T & D Sas Interrupteur electrique haute tension avec retour sur fermeture et dispositif d'insertion d'une resistance

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2450501A1 (fr) * 1979-03-02 1980-09-26 Alsthom Cgee Dispositif d'insertion de resistance a la fermeture d'un appareil d'interruption
DE3411445A1 (de) * 1984-02-06 1985-08-08 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Hochspannungsschalter
FR2663456B1 (fr) * 1990-06-14 1996-04-26 Alsthom Gec Disjoncteur a varistance incorporee.

Also Published As

Publication number Publication date
DE69309759D1 (de) 1997-05-22
ES2099920T3 (es) 1997-06-01
CA2091321A1 (fr) 1993-09-11
FR2688624A1 (fr) 1993-09-17
US5302784A (en) 1994-04-12
EP0560665A1 (de) 1993-09-15
CA2091321C (fr) 1996-07-23
DE69309759T2 (de) 1997-07-31
FR2688624B1 (de) 1994-04-22

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