EP0515268B1 - Varistor Einführvorrichtung, eingebaut in einem Hochspannungslastschalter - Google Patents

Varistor Einführvorrichtung, eingebaut in einem Hochspannungslastschalter Download PDF

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Publication number
EP0515268B1
EP0515268B1 EP92401369A EP92401369A EP0515268B1 EP 0515268 B1 EP0515268 B1 EP 0515268B1 EP 92401369 A EP92401369 A EP 92401369A EP 92401369 A EP92401369 A EP 92401369A EP 0515268 B1 EP0515268 B1 EP 0515268B1
Authority
EP
European Patent Office
Prior art keywords
contact
tube
circuit
rod
breaker
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
EP92401369A
Other languages
English (en)
French (fr)
Other versions
EP0515268A1 (de
Inventor
Van Doan Pham
Michel Perret
Joseph Martin
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.)
Alstom Holdings SA
Original Assignee
GEC Alsthom 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 SA filed Critical GEC Alsthom SA
Publication of EP0515268A1 publication Critical patent/EP0515268A1/de
Application granted granted Critical
Publication of EP0515268B1 publication Critical patent/EP0515268B1/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
    • 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
    • H01H33/76—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor
    • H01H33/765—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor the gas-evolving material being incorporated in the contact material

Definitions

  • the present invention relates to a circuit breaker with means for the momentary insertion, in parallel on the contacts, of an electrical component.
  • circuit breaker with means for momentary insertion, in parallel on the contacts of the circuit breaker, at the start of opening and at the start of the closing of the circuit breaker, of an electrical component chosen from resistors, varistors, capacitors or a combination of these elements
  • said circuit breaker comprising, for each phase, at least one breaking chamber comprising a sealed insulating envelope filled of gas with good dielectric properties and comprising inside a fixed arcing contact connected to a first socket, and a movable assembly comprising a movable arcing contact connected to a second socket and an operating rod
  • said circuit breaker further comprising inside said chamber said electrical component connected on the one hand to said first socket and on the other hand to at least one contact arm act carrying a contact ring
  • circuit breaker which also comprises a metallic guide element mechanically and electrically connected to said moving element, a rod which can slide inside said guide element, said rod comprising at a first end
  • Such a circuit breaker has a drawback: the rapid movement of moving parts, in the absence of any damping means, can cause operating shocks.
  • An object of the present invention is to define a circuit breaker of the aforementioned type which, despite rapid movement of its constituent elements, has damping means making it possible to avoid suddenly and any possible rebound which could cause a reboot.
  • the subject of the invention is a circuit breaker with means for the momentary insertion, in parallel on the contacts of the circuit breakers, at the start of the opening and at the start of the closing of the circuit breaker, of an electrical component chosen from the resistors, varistors, capacitors or a combination of these elements, said circuit breaker comprising, for each phase, at least one breaking chamber comprising a sealed insulating envelope filled with gases with good dielectric properties and comprising inside a fixed main contact connected to a first electrical outlet and a fixed arcing contact, and a movable assembly comprising a movable main contact connected to a second electrical outlet, a movable arcing contact and an operating rod, said electrical component being placed inside of said chamber and being connected on the one hand to said first socket and on the other hand to at least one contact arm carrying a crown contact, the circuit breaker further comprising a metal tube mechanically and electrically connected to said movable main contact, a rod which can slide inside said tube, said rod comprising at a first end a
  • the end of the contact sleeve is made of a metallic material impregnated with a product which releases, under the effect of the electric arc, a dielectric gas.
  • the contact arm is produced in the form of a tube provided at one end with contact fingers and with a partition to delimit a blowing volume, an insulating nozzle surrounding the contact fingers.
  • the insulating nozzle with the tube forms a blowing volume, the partition being removed.
  • the distance corresponding to the length of the displacement of the tube before driving the rod is determined to obtain an insertion time of the varistor at the opening of the order of 8 milliseconds.
  • the reference 1 designates an insulating envelope, preferably made of porcelain, delimiting a volume 2 containing the breaking elements of the circuit breaker.
  • the insulating envelope is closed at one end by a metal plate 3, fixed to a metal crown 4 constituting a first and prolonged socket, inside the envelope by arms 5 to which are fixed a first metal tube 6 constituting the main fixed contact, and a second tube 7, coaxial with the first, constituting the fixed arcing contact.
  • Volume 2 is filled with a gas with good dielectric properties, such as sulfur hexafluoride, under a pressure of a few bars.
  • the mobile assembly of the circuit breaker comprises a metal tube 9, extended by a corona hood 10, and provided with a transverse metal partition 11 carrying contact fingers 12 constituting the movable main contact, and a blowing tube 13 extended by contact fingers 14 constituting the movable arcing contact.
  • the partition 11, pierced with holes 15 for the passage of the blowing gas, carries a blowing nozzle 17 made of insulating material.
  • the blowing is provided by a fixed piston placed inside the tube 9, and not shown in FIG. 1.
  • the tube 9 is connected, by sliding contacts, not shown, to a second outlet of the circuit breaker.
  • a varistor is placed inside the volume 2. This consists of a stack of discs 18 placed in an insulating tube 19, fixed at one end to the plate 3 and closed at the other end by a metal block 20 .
  • the varistor can be associated with several ohmic elements (resistance); the invention also applies to circuit breakers in which there are only ohmic elements.
  • the invention applies to any circuit breaker in which an electrical component ( varistor, resistor, capacitor, or any combination of these) must be inserted either when the circuit breaker opens, when it closes, or during these two operations.
  • the insertion device of the invention is generally represented at 30 in FIG. 1. It cooperates with a contact consisting of arms 31, fixed to the metal block 20 and carrying a metal crown 31A ..
  • FIGS. 2A and 2B A detailed example of an embodiment of the insertion device is shown in FIGS. 2A and 2B.
  • the insertion device comprises a metal tube 32, having a projection 32A by which the tube is mechanically fixed and electrically connected to the tube 9, for example by brazing.
  • a sleeve 33 for example made of Teflon.
  • the sleeve 33 and the tube 32 define a housing in which is housed a first end of a spring 34 which bears against a shoulder 32B formed inside the tube 32.
  • the sleeve 33 is screwed onto the shoulder 32B.
  • An insulating washer 35 is glued to the upper end of the tube 32.
  • the lower end of the tube 32 has an internal profile of conical shape, the role of which will be explained below.
  • a rod 37 for example of high resistance brass, terminated by a portion 37 A of larger diameter pierced with a threaded bore 37B.
  • a shoulder 37C serves as a support for the second end of the spring 34.
  • a stop or ring 38 On the lower end of the portion 37A is engaged a stop or ring 38, with conical external profile, preferably made made of polytetrafluoroethylene, and provided with an O-ring 39.
  • the ring 38 is held in place by the head of a bolt 40, screwed into the bore 37B with interposition of rings 41 and 42.
  • a contact sleeve 43 advantageously made of copper.
  • the device also allows the varistor to be inserted when the circuit breaker closes. It is enough for this that the end of the sleeve 43 comes into contact with the crown 31A before the arcing contacts 7 and 14 come into contact.
  • the distance a determines the insertion time at closing, the duration of which is usually of the order of 8 ms. If, at rest, the end of the movable arcing contact 14 and the end 43A of the contact sleeve 43 are at the same level, and if the distance a is zero, there can be no insertion of the varistor when closing of the circuit breaker.
  • FIG. 3 represents an alternative embodiment of the device, which can advantageously be used for circuit-breakers with a metal grounded enclosure, in which there is a relatively large space around the breaking elements.
  • the contact arms 31 are replaced by a tube 50 terminated by contact fingers 51.
  • the tube has a bottom 53, so that its internal volume 56 constitutes a blowing volume of the arc which is established at the separation of the fingers 51 and of the contact 43A.
  • a nozzle 54 made of an insulating material such as polytetrafluoroethylene, promotes this blowing.
  • the tube 32 of the device is fixed to the mobile tube by an arm 55.
  • distance a is equal to zero, there is no insertion of a varistor when the circuit breaker closes.
  • the invention applies to high-voltage circuit breakers of the conventional type with a ceramic shell or of the type with a metal shell on the ground.

Landscapes

  • Circuit Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Thermistors And Varistors (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Claims (5)

  1. Leistungsschalter mit Mitteln zur vorübergehenden Parallelschaltung eines elektrischen Bauteils (18) zu den Kontakten des Schalters zu Beginn der Öffnungs- und Schließphase des Schalters, wobei dieses Bauteil aus Widerständen, Varistoren, Kondensatoren oder einer Kombination dieser Elemente ausgewählt wird und der Schalter für jede Phase mindestens eine Trennkammer mit einer dichten Isolierhülle (1) aufweist, die mit einem Gas guter dielektrischer Eigenschaften gefüllt ist und einen an einen ersten Stromanschluß (4) angeschlossenen ersten Hauptkontakt (6) und einen ortsfesten Lichtbogenkontakt (7) sowie eine bewegliche Einheit mit einem an einen zweiten Stromanschluß angeschlossenen beweglichen Hauptkontakt (9), einem beweglichen Lichtbogenkontakt (14) sowie ein Betätigungsgestänge enthält, wobei das elektrische Bauteil (18) in der Kammer angeordnet und einerseits an den ersten Stromanschluß (4) und andererseits an mindestens einen Kontaktarm (31) angeschlossen ist, der einen Kontaktkranz (31A) trägt, wobei der Schalter weiter ein mechanisch und elektrisch mit dem beweglichen Hauptkontakt (9) verbundenes Metallrohr (32) und eine Stange (37) enthält, die im Inneren des Rohrs gleiten kann und an einem ersten Ende eine metallische Kontakthülse (43) besitzt, die mit dem Kranz (31A) in elektrischen Kontakt kommen kann und an einem ersten Ende des Rohrs anliegt, wobei eine Feder (34) aus leitendem Material im Inneren des Rohrs (32) und um die Stange (37) herum zwischen dem ersten Ende des Rohrs (32) und dem zweiten Ende der Stange (37) angeordnet ist und entspannt ist, wenn sich der Schalter in der geschlossenen oder offenen Ruhestellung befindet, dadurch gekennzeichnet, daß das zweite Ende der Stange einen konischen Anschlag (38) besitzt, der einen Ring (39) aus Polytetrafluoräthylen besitzt, und daß das zweite Ende des Rohrs (32) innen eine komplementäre konische Form zu der des Anschlags (38) besitzt.
  2. Schalter nach Anspruch 1, dadurch gekennzeichnet, daß das Ende (43A) der Kontakthülse aus einem Metall besteht, das mit einem unter der Wirkung des elektrischen Lichtbogens ein dielektrisches Gas freigebenden Produkt imprägniert ist.
  3. Schalter nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der Kontaktarm als Rohr (50) ausgebildet ist, das an einem Ende Kontaktfinger (51) und eine Wand (53) besitzt, mit der das Blasvolumen begrenzt wird, wobei eine isolierende Düse (54) die Kontaktfinger umgibt.
  4. Schalter nach Anspruch 3, dadurch gekennzeichnet, daß die isolierende Düse (54) mit dem Rohr (50) ein Blasvolumen (57) bildet, wobei die Wand (53) entfällt.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Abstand (dl) entsprechend der Länge der Hubbewegung des Rohrs (32) vor dem Antrieb der Stange (37) so bestimmt ist, daß sich eine Einfügungszeit des Varistors beim Öffnen des Schalters in der Größenordnung von 8 ms ergibt.
EP92401369A 1991-05-22 1992-05-20 Varistor Einführvorrichtung, eingebaut in einem Hochspannungslastschalter Expired - Lifetime EP0515268B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106159 1991-05-22
FR9106159A FR2676857B1 (fr) 1991-05-22 1991-05-22 Dispositif d'insertion d'une varistance, incorpore dans un disjoncteur a haute tension.

Publications (2)

Publication Number Publication Date
EP0515268A1 EP0515268A1 (de) 1992-11-25
EP0515268B1 true EP0515268B1 (de) 1996-01-03

Family

ID=9413003

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401369A Expired - Lifetime EP0515268B1 (de) 1991-05-22 1992-05-20 Varistor Einführvorrichtung, eingebaut in einem Hochspannungslastschalter

Country Status (7)

Country Link
US (1) US5264671A (de)
EP (1) EP0515268B1 (de)
AT (1) ATE132655T1 (de)
CA (1) CA2069185C (de)
DE (1) DE69207265T2 (de)
ES (1) ES2081584T3 (de)
FR (1) FR2676857B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2712118B1 (fr) * 1993-11-02 1995-12-29 Gec Alsthom T & D Sa Disjoncteur avec dispositif d'insertion d'un composant électrique.
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
CA2851850C (en) * 2013-06-05 2015-10-20 Mersen Usa Newburyport-Ma, Llc Circuit protection device
KR101797021B1 (ko) * 2014-10-23 2017-11-13 엘에스산전 주식회사 초고압 차단기의 투입 저항 지지 구조

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB936545A (en) * 1960-12-15 1963-09-11 Asea Ab Air blast electric circuit breaker
CH579819A5 (de) * 1974-11-22 1976-09-15 Bbc Brown Boveri & Cie
GB2032180B (en) * 1978-09-12 1983-06-29 Westinghouse Electric Corp Circuit-interrupters
JPS5769633A (en) * 1980-10-20 1982-04-28 Hitachi Ltd Resistance breakdown gas breaker
DE3412824A1 (de) * 1984-04-05 1985-10-17 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Elektrischer lastschalter, insbesondere zur verwendung in mittelspannungsschaltgeraeten
FR2663456B1 (fr) * 1990-06-14 1996-04-26 Alsthom Gec Disjoncteur a varistance incorporee.

Also Published As

Publication number Publication date
FR2676857A1 (fr) 1992-11-27
US5264671A (en) 1993-11-23
ES2081584T3 (es) 1996-03-16
DE69207265D1 (de) 1996-02-15
CA2069185A1 (fr) 1992-11-23
ATE132655T1 (de) 1996-01-15
FR2676857B1 (fr) 1994-04-08
CA2069185C (fr) 1996-07-23
EP0515268A1 (de) 1992-11-25
DE69207265T2 (de) 1996-05-15

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