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EP0580515B1 - Lastschalter mit zwei konzentrischen Löschkammern - Google Patents

Lastschalter mit zwei konzentrischen Löschkammern Download PDF

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Publication number
EP0580515B1
EP0580515B1 EP93401903A EP93401903A EP0580515B1 EP 0580515 B1 EP0580515 B1 EP 0580515B1 EP 93401903 A EP93401903 A EP 93401903A EP 93401903 A EP93401903 A EP 93401903A EP 0580515 B1 EP0580515 B1 EP 0580515B1
Authority
EP
European Patent Office
Prior art keywords
closure member
arcing contact
blast nozzle
thermal expansion
circuit
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
EP93401903A
Other languages
English (en)
French (fr)
Other versions
EP0580515A1 (de
Inventor
Michel Perret
Denis Dufournet
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 EP0580515A1 publication Critical patent/EP0580515A1/de
Application granted granted Critical
Publication of EP0580515B1 publication Critical patent/EP0580515B1/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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow

Definitions

  • the invention relates to a self-blowing circuit breaker comprising a casing intended to be filled with a fluid for extinguishing an electric arc, a first closing element disposed inside the casing and defining a first chamber d thermal expansion, a second closure element disposed inside the first closure element and defining a second thermal expansion chamber, a first contact mounted sliding inside the envelope in an axial sliding direction to penetrate inside said first and second thermal expansion chambers in order to cooperate electrically with a second arcing contact which extends axially inside the second thermal expansion chamber, said blowing nozzles being superimposed concentric in this sliding direction to obtain their closure by the first movable arcing contact.
  • circuit breakers having a casing filled with a gas with good dielectric properties, in particular SF6 and which do not include either a blowing piston or a magnet.
  • Such a self-blowing circuit breaker comprising two thermal expansion chambers having different volumes to allow cutting of currents located in a large range of currents, for example electric currents going from 0 to 25000 amps, is known from document EP- A-150 079.
  • the object of the invention is to improve the performance of such a thermal expansion gas circuit breaker with two expansion chambers to more effectively cut small and large currents in a large range of electric currents.
  • the invention relates to a self-blowing circuit breaker according to one of claims 1 and 2.
  • the advantages obtained by the invention are as follows.
  • the cutting element has a simple shape.
  • the number of parts of the circuit breaker is reduced compared to conventional self-blowing circuit breakers having two expansion chambers.
  • the circuit breaker according to the invention operates with a much lower control energy than devices having two movable contacts per pole.
  • the circuit breaker operates for the entire current range from 0 to 25,000 amperes and beyond in certain cases.
  • FIG. 5 represents another variant of the circuit breaker according to the invention.
  • the medium or high voltage circuit breaker comprises a sealed casing 1 filled with a dielectric gas, such as SF6, inside which is placed an electric arc breaking assembly.
  • a dielectric gas such as SF6
  • the cut-off assembly comprises a first cylinder 2 delimiting a thermal expansion chamber having a volume V1 and having a blowing nozzle 3 for blowing the electric arc generated by large currents to be cut, a second cylinder 4 incorporated in the cylinder 2 and carrying a nozzle 5 for blowing the electric arc generated by small currents to be cut.
  • the second cylinder 4 delimits a thermal expansion chamber having a volume V2 smaller than the volume V1.
  • the two cylinders have concentric sections (coaxial cylinders) to compact the cut-off assembly.
  • This first contact can be of the tulip type and has contact fingers 20.
  • Each cylinder 2.4 has a closed end connected to the casing and carrying the fixed arcing contact 6 and an open end carrying a blowing nozzle 3.5.
  • the blowing nozzles 3,5 are superimposed and spaced from each other as visible in FIG. 1. They have substantially concentric gas passage sections (axially aligned). They are crossed by a single movable arcing contact 7 electrically connected to a second socket and mechanically to an operating member which causes it to slide inside the nozzles perpendicularly to their section to engage it between the fingers 20 of the fixed contact 6 or release it. Contacts 6 and 7 are aligned.
  • the movable contact 7 has an end portion 8 with a section complementary to that of the nozzle 5 for closing the latter and a middle portion 9 with a section complementary to that of the nozzle 3 for closing the latter.
  • the nozzle 5 has a smaller gas passage section than that of the nozzle 3, the size of the nozzle sections being a function of the respective volumes of the expansion chambers.
  • the movable contact 7 further carries fingers 10 for the passage of the permanent current by establishing electrical contact with the exterior surface of the first cylinder 2.
  • the movable contact 7 is engaged in the fixed contact 6. In the closed position, the current flows through the permanent contact fingers 10.
  • the circuit breaker works as follows. In the case where a small current passing through the breaking assembly must be cut, the circuit breaker operating member is actuated to move the movable contact 7. The passage of permanent current by the fingers 10 is interrupted at first then it there is switching of the arcing contacts 6 and 7 and an electric arc appears between them. The energy emitted by the electric arc causes a rise in pressure of the gas in the volume V2 by increasing the temperature and a gas circulation takes place between this volume and the volume V1 which plays the role of an expansion volume due to the pressure difference between these two volumes and the clearance of the nozzle 5 by the arcing contact 7 moving. The circulation of gas cuts off the electric arc when the current crosses zero.
  • the small cylinder 4 is slidably mounted inside the large cylinder and carries a part 11 of the first contact 6, the other part 12 of the contact 6 connected to the first electrical outlet being fixed.
  • This part 12 enters a cavity 17 arranged in the small cylinder and is electrically connected to the latter by accordion contacts 13.
  • the large cylinder is connected by its closed end to the casing 1 by means of a third cylinder 15 having orifices 14 opening into the expansion volume V3 and into which the small cylinder 4 also slides.
  • the nozzle 5 When the movable arcing contact 7 is in the engaged position, the nozzle 5 remains in abutment on the nozzle 3 under the effect of a spring 16 in abutment on the wall of the envelope and exerting a pushing force on the small cylinder.
  • the small cylinder 4 remains in place and the gas flow shown schematically by an arrow takes place directly from the volume V2 to the expansion volume V3 subjected to a lower gas pressure than the volume V2 which improves the efficiency of the blowing of the electric arc.
  • the small cylinder 4 slides, under the effect of the pressure increase in the gas in volumes V1 and V2, inside the large cylinder 2 and the third cylinder 15 in the same direction as the sliding of the movable contact 7 and in the opposite direction as visible in FIG. 4 until it comes into abutment against the fixed part 12 of the arcing contact 6.
  • the displacement of the small cylinder is caused by the rise in pressure of the gas due to the bow electric in volume V2.
  • the first contact 6 is in a single fixed part and the small cylinder 4 slides inside the large cylinder 2 and along the first fixed contact 6.
  • the first contact 6 has a shoulder 18 serving as a stop to stop the stroke of the small cylinder.
  • the nozzle 5 always rests on the nozzle 3 under the effect of the spring 16.
  • the blowing of the electric arc generated by small currents to be cut is identical to the case of FIG. 3.
  • the small cylinder slides inside the large cylinder 2 and of the third cylinder 15 under the effect of the pressure increase of the gas in the volumes V1 and V2 but the electric arc to be blown is not lengthened by the displacement of the small cylinder, the arcing contact 6 remaining fixed, which increases the efficiency of the electric arc blowing.

Landscapes

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

Claims (6)

  1. Leistungsschalter mit Selbstblaseffekt, der in einer Hülle (1), die mit einem Fluid zum Auslöschen eines elektrischen Lichtbogens gefüllt werden soll, ein erstes Verschlußelement (2) mit einer ersten Blasdüse (3), das eine erste Wärmeexpansionskammer definiert, ein zweites Verschlußelement (4) mit einer zweiten Blasdüse (5), das eine zweite Wärmeexpansionskammer definiert, einen ersten Lichtbogenkontakt (7), der im Inneren der Hülle in axialer Richtung gleitet und in die beiden Wärmeexpansionskammern eindringt sowie elektrisch mit einem zweiten Lichtbogenkontakt (6) zusammenwirkt, der sich axial im Inneren der zweiten Wärmeexpansionskammer erstreckt, wobei die Blasdüsen (3, 5) konzentrisch in Gleitrichtung fluchtend übereinanderliegen und durch den ersten beweglichen Lichtbogenkontakt (7) verschlossen werden können, dadurch gekennzeichnet, daß
    - das zweite Verschlußelement (4) im Inneren des ersten Verschlußelements (2) gemäß der axialen Gleitrichtung des ersten Lichtbogenkontakts (7) translatorisch beweglich montiert ist,
    - der zweite Lichtbogenkontakt (6) beweglich in der Hülle und ortsfest innerhalb des zweiten beweglichen Verschlußelements (4) montiert ist,
    - und ein elastisches Element (16) vorgesehen ist, um das zweite Verschlußelement (4) so zu beaufschlagen, daß die zweite Blasdüse (5) auf die erste Blasdüse (3) gedrückt wird.
  2. Leistungsschalter mit Selbstblaseffekt, der in einer Hülle (1), die mit einem Fluid zum Auslöschen eines elektrischen Lichtbogens gefüllt werden soll, ein erstes Verschlußelement (2) mit einer ersten Blasdüse (3), das eine erste Wärmeexpansionskammer definiert, ein zweites Verschlußelement (4) mit einer zweiten Blasdüse (5), das eine zweite Wärmeexpansionskammer definiert, einen ersten Lichtbogenkontakt (7), der im Inneren der Hülle in axialer Richtung gleitet und in die beiden Wärmeexpansionskammern eindringt sowie elektrisch mit einem zweiten Lichtbogenkontakt (6) zusammenwirkt, der sich axial im Inneren der zweiten Wärmeexpansionskammer erstreckt, wobei die Blasdüsen (3, 5) konzentrisch in Gleitrichtung fluchtend übereinanderliegen und durch den ersten beweglichen Lichtbogenkontakt (7) verschlossen werden können, dadurch gekennzeichnet, daß
    - das zweite Verschlußelement (4) im Inneren des ersten Verschlußelements (2) gemäß der axialen Gleitrichtung des ersten Lichtbogenkontakts (7) translatorisch beweglich montiert ist,
    - das zweite bewegliche Verschlußelement (4) entlang des zweiten Lichtbogenkontakts (6) gleitet, der ortsfest innerhalb der Hülle montiert ist,
    - und ein elastisches Element (16) vorgesehen ist, um das zweite Verschlußelement (4) so zu beaufschlagen, daß die zweite Blasdüse (5) auf die erste Blasdüse (3) gedrückt wird.
  3. Leistungsschalter nach einem der Ansprüche 1 oder 2, bei dem die erste Blasdüse (3) einen größeren Durchlaßquerschnitt als die zweite Blasdüse (5) besitzt.
  4. Leistungsschalter nach Anspruch 3, bei dem der erste bewegliche Lichtbogenkontakt (7) einen ersten Bereich (8) mit einem zum Durchlaßquerschnitt der zweiten Blasdüse (5) komplementären Querschnitt, um diese Düse zu verschließen, und einen zweiten Bereich (9) mit einem zum Durchlaßquerschnitt der ersten Blasdüse (3) komplementären Querschnitt besitzt, um diese Düse zu verschließen.
  5. Leistungsschalter nach Anspruch 2, bei dem der zweite Lichtbogenkontakt (6) eine Schulter (18) aufweist, um den Hub des zweiten Verschlußelements (4) bezüglich des ersten Verschlußelements (2) zu begrenzen.
  6. Leistungsschalter nach einem der vorhergehende Ansprüche, bei dem die beiden Verschlußelemente (2, 4) Zylinder mit konzentrischen Querschnitten sind.
EP93401903A 1992-07-24 1993-07-22 Lastschalter mit zwei konzentrischen Löschkammern Expired - Lifetime EP0580515B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9209169 1992-07-24
FR9209169A FR2694127B1 (fr) 1992-07-24 1992-07-24 Disjoncteur à deux chambres de coupure concentriques.

Publications (2)

Publication Number Publication Date
EP0580515A1 EP0580515A1 (de) 1994-01-26
EP0580515B1 true EP0580515B1 (de) 1997-03-26

Family

ID=9432240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93401903A Expired - Lifetime EP0580515B1 (de) 1992-07-24 1993-07-22 Lastschalter mit zwei konzentrischen Löschkammern

Country Status (6)

Country Link
US (1) US5373131A (de)
EP (1) EP0580515B1 (de)
CA (1) CA2101214C (de)
DE (1) DE69309174T2 (de)
ES (1) ES2099394T3 (de)
FR (1) FR2694127B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711269B1 (fr) * 1993-10-12 1995-12-29 Gec Alsthom T & D Sa Disjoncteur à haute tension capable de couper des courants de défaut à passage par zéro retardé.
US9305726B2 (en) * 2014-08-27 2016-04-05 Eaton Corporation Arc extinguishing contact assembly for a circuit breaker assembly
US9343252B2 (en) 2014-08-27 2016-05-17 Eaton Corporation Arc extinguishing contact assembly for a circuit breaker assembly

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH632609A5 (de) * 1977-03-24 1982-10-15 Mitsubishi Electric Corp Stromunterbrecher mit lichtbogenloeschendem gas.
CA1096914A (en) * 1977-03-24 1981-03-03 Masami Kii Circuit interrupter comprising plural arc-quenching fluid pressure chambers
IT8420599V0 (it) * 1984-01-20 1984-01-20 Sace Spa Interruttore elettrico a fluido di estinzione dell'arco con autogenerazione di pressione per decomposizione del fluido.
IT1196105B (it) * 1984-05-10 1988-11-10 Sace Spa Interruttore elettrico ad alta tensione con dispositivo di estinzione dell'arco mediante autogenerazione di pressione di un fluido di estinzione
FR2651065B1 (fr) * 1989-08-18 1996-07-05 Alsthom Gec Disjoncteur a moyenne tension a autosoufflage

Also Published As

Publication number Publication date
DE69309174T2 (de) 1997-07-10
DE69309174D1 (de) 1997-04-30
US5373131A (en) 1994-12-13
ES2099394T3 (es) 1997-05-16
EP0580515A1 (de) 1994-01-26
CA2101214A1 (fr) 1994-01-25
FR2694127B1 (fr) 1994-08-19
FR2694127A1 (fr) 1994-01-28
CA2101214C (fr) 2003-03-18

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