EP0334181B1 - High-tension switch with a reduced driving energy - Google Patents

High-tension switch with a reduced driving energy Download PDF

Info

Publication number
EP0334181B1
EP0334181B1 EP89104558A EP89104558A EP0334181B1 EP 0334181 B1 EP0334181 B1 EP 0334181B1 EP 89104558 A EP89104558 A EP 89104558A EP 89104558 A EP89104558 A EP 89104558A EP 0334181 B1 EP0334181 B1 EP 0334181B1
Authority
EP
European Patent Office
Prior art keywords
tube
contact
circuit breaker
fixed
piston
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
EP89104558A
Other languages
German (de)
French (fr)
Other versions
EP0334181A1 (en
Inventor
Edmond Thuries
Denis Dufournet
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.)
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
Priority to AT89104558T priority Critical patent/ATE99829T1/en
Publication of EP0334181A1 publication Critical patent/EP0334181A1/en
Application granted granted Critical
Publication of EP0334181B1 publication Critical patent/EP0334181B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01H33/7007—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein the flow is a function of the current being interrupted
    • 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
    • H01H33/901—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 making use of the energy of the arc or an auxiliary arc
    • H01H33/903—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 making use of the energy of the arc or an auxiliary arc and assisting the operating mechanism

Definitions

  • the present invention relates to a circuit breaker according to the preamble of claim 1.
  • Such a circuit breaker is known for example from document FR-A-2 610 763.
  • This document shows secondary contacts of a circuit breaker; one of these contacts is integral with the fixed assembly and the other is mounted on a pivot also integral with the fixed assembly.
  • the length of the arc cannot exceed a given length.
  • the object of the invention is to define a circuit breaker in which the length of the secondary arc is limited to a given length less than the maximum separation length of the arcing contacts, although one of the secondary contacts is integral with the fixed assembly and the other of the mobile assembly of the circuit breaker.
  • no arc between the secondary contacts begins to engage.
  • the structure of the circuit breaker of the invention is similar to that described in document FR-A-2 576 142; in particular the fixed and movable arcing contacts are coaxial tubes defining a blowing cylinder closed by a fixed piston at the end of which is a blowing nozzle.
  • the subject of the present invention is a high-voltage circuit breaker with pressurized dielectric gas, of the type comprising at least one breaking chamber comprising an insulating envelope filled with said gas inside which are placed a fixed assembly comprising a fixed main contact and a fixed arcing contact, a movable assembly comprising in particular a movable main contact and a movable arcing contact, the breaking chamber further comprising a blowing cylinder opening into a blowing nozzle, a fixed blowing piston and a pair of secondary contacts, characterized in that that said blowing cylinder is delimited by a first tube constituting the movable arcing contact, by a second tube constituting the movable main contact and by said fixed blowing piston, that said first tube and a third tube connected to the fixed assembly and concentric with said first tube define, on the other side of the fixed blow piston, a variable volume containing the secondary contacts, f closed on one side by a closing piston and on the other side by an annular end piston linked to said first tube and sliding
  • the second secondary contact is provided with a latching means cooperating with grooves made in said first tube to block said second secondary contact in said fixed positions, said movable assembly comprising a contact cooperating with a contact integral with the fixed assembly to put said second secondary contact to the potential of said first secondary contact during the phase of circuit breaker reset.
  • FIG. 1 shows a breaking chamber comprising an envelope 1, made of an insulating material such as ceramic, filled with a dielectric gas such as sulfur hexafluoride under a pressure of a few bars.
  • an assembly comprising a fixed main contact formed by contact fingers 2 protected by a corona hood 3 and an arcing contact formed by a metal tube 4 terminated by one end 4A alloy resistant to the effects of the arc.
  • the moving element comprises a metal tube 5 serving as a moving arcing contact, terminated by a tip 5A made of an alloy resistant to the effects of the arcing.
  • the tube 5 is driven by a metal tube 6, for example of aluminum, fixed to an operating rod, not shown. Tubes 5 and 6 are not attached to each other; on the contrary, a certain clearance between them is possible; the drive is done by two steps 5B and 6B of the tubes 5 and 6. The travel is limited by a stop 6C.
  • a metal tube 7, concentric with the tube 5, serves as a movable main contact.
  • blowing nozzle 8 made of insulating material. It is in electrical contact with a metal block 9, made of aluminum for example, secured to the fixed assembly, by contact fingers 10.
  • the tube 5 and the tube 7 are joined by an insulating ring 12, pierced with holes 12A.
  • the volume 20 delimited by the tubes 5 and 7 is closed by a fixed piston 14, made of an insulating material such as polytetrafluoroethylene, held in place by a metal tube 15 fixed to the block 9.
  • the volume delimited by the tubes 5 and 7, the ring 12 and the piston 14 is designated by 20. This volume constitutes the blow-out cylinder of the circuit breaker.
  • the piston 14 is pierced with orifices 16 and includes a valve 17 authorizing the passage of gas only from the outside to the inside of the volume 20.
  • the piston 14 comprises a seal 18 and a guide 19.
  • the orifices 16 of the piston 14 can be obstructed by an annular piston 22, which can slide in the annular space formed by the tube 5 and a cylindrical extension 23, pierced with holes 23A, of the piston 14.
  • the annular piston 22 is pushed against the orifices 16 by a spring 24 pressing against an integral part of the fixed tube 15.
  • the piston is sealed by seals 26 and 27.
  • the insulating block is guided in the annular space between the tubes 5 and 15 thanks to a portion 32A coming to bear against the tube 15.
  • This portion is provided with orifices 33 to allow the free passage of gas in the volume 35 comprised between the tube 15 and the parts 31, 32 and 42.
  • the insulating part 32 is provided with a latching system, for example with balls 36 and springs 37, cooperating with grooves 38 and 39 formed in the tube 5.
  • a stop 40 of the tube 15 limits the stroke of the insulating part 32 .
  • the volume 35 is closed by an annular insulating end piston 42, fixed to the tube 5 and having a guide segment 43 and a valve 44 allowing the passage of gas only from the outside to the inside of the volume 35.
  • the tube 5 has holes 46 at its end.
  • the tube 6 has holes 47.
  • the part 9 carries a contact 48 cooperating with one end 49 of the tube 5 to place the tube 5 at the same potential as the rest of the moving assembly at the end of the opening stroke.
  • the circuit breaker works as follows.
  • the vacuum generated in the volume 35 causes the valve 44 to open and the pressure in the volume 35 to be maintained. There is therefore no loss by suction.
  • the arc 60 which is established between the contacts 30 and 31 either at the same time as the arc 50, either slightly before or slightly after, creates a sufficiently low overpressure so as not to disturb this operation.
  • the current passes through contact 4, arc 50, tube 5, contacts 31B, contact 31, arc 60, contact 30 , the tube 15 and the part 9.
  • the part 32A After a certain stroke, determined as a function of the short-circuit current, the part 32A abuts on the stop 40.
  • the tube 5 continuing its stroke, the balls 36 leave the groove 39 and come to be positioned on the groove 38 (FIG. 3 ) at the end of the opening maneuver and the slight overpressure of the volume 20 disappears thanks to the holes 23A; the piston 22 abuts against the fixed piston 14.
  • the contact 48 puts the end 49 of the tube 5, and therefore the contact 31, at the potential of the part 9, of the tube 15 and therefore of the contact 30.
  • the maximum separation distance of the secondary contacts remains less to that of the arcing contacts, so that there is no risk of ignition due to excessive stretching of the secondary arcing.
  • the tube 6 is actuated to the left of the figure ( Figure 4).
  • the stop 6C drives the tube 5 and the contacts 30 and 31 come into contact, without creating an arc since they are at the same potential thanks to the contact of the parts 48 and 49.
  • the slight overpressure in the volume 35 is evacuated, by the holes 46 and 47 which coincide, towards the volume 70 inside the tube 5.
  • Figure 5 shows the circuit breaker being opened by moving the tube 6 to the right of the figure.
  • the very high intensity arc 60 causes rapid heating of the volume 35 and of the volume 35B surrounded by the contacts 30, 31, the piston 22 and the cylinder 5.
  • the hot gas of volume 35 passes through the orifices 33 of the part 32A.
  • the circuit breaker of the invention requires only a low operating energy for all the current values to be cut.
  • the number of elements is low and they are all of revolution which ensures an economical construction and an easy and fast assembly.

Landscapes

  • Circuit Breakers (AREA)
  • Lasers (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Electronic Switches (AREA)
  • Organic Insulating Materials (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

High-tension pressurised dielectric gas switch of the type including at least one cut-off chamber comprising an insulating surround filled with the said gas and inside which are placed an assembly comprising a stationary main contact (2) and a stationary arc contact (4), a movable assembly comprising in particular a movable main contact (7) and a movable arc contact (5), the cut-off chamber further comprising a snuffing cylinder opening into a snuffing nozzle and a pair of secondary contacts, characterised in that it includes first means (37, 38, 104) for limiting the maximum distance of separation of the secondary contacts to a value less than the maximum distance of separation of the arc contacts and second means (6C, 101) for preventing any sparking on triggering. <IMAGE>

Description

La présente invention concerne un disjoncteur selon le préambule de la revendication 1.The present invention relates to a circuit breaker according to the preamble of claim 1.

Un tel disjoncteur est connu par example du document FR-A-2 610 763.Such a circuit breaker is known for example from document FR-A-2 610 763.

Ce document montre des contacts secondaires d'un disjoncteur; l'un de ces contacts est solidaire de l'ensemble fixe et l'autre est monté sur un pivot également solidaire de l'ensemble fixe. Par construction, la longueur de l'arc ne peut dépasser une longueur donnée.This document shows secondary contacts of a circuit breaker; one of these contacts is integral with the fixed assembly and the other is mounted on a pivot also integral with the fixed assembly. By construction, the length of the arc cannot exceed a given length.

Cette solution n'est pas applicable aux contacts secondaires dont l'un est solidaire de l'ensemble fixe et l'autre de l'ensemble mobile du disjoncteur.This solution is not applicable to secondary contacts, one of which is integral with the fixed assembly and the other with the mobile assembly of the circuit breaker.

Le but de l'invention est de définir un disjoncteur dans lequel la longueur de l'arc secondaire est limitée à une longueur donnée inférieure à la longueur maximale de séparation des contacts d'arc, bien que l'un des contacts secondaire soit solidaire de l'ensemble fixe et l'autre de l'ensemble mobile du disjoncteur.The object of the invention is to define a circuit breaker in which the length of the secondary arc is limited to a given length less than the maximum separation length of the arcing contacts, although one of the secondary contacts is integral with the fixed assembly and the other of the mobile assembly of the circuit breaker.

Dans le disjoncteur de l'art antérieur, aucune mesure n'est prévue pour empêcher l'apparition d'un arc entre les contacts secondaires à l'enclenchement du disjoncteur. Or, cet arc est responsable de l'accroîssement de l'énergie de manoeuvre de fermeture et entraîne une usure supplémentaire du disjoncteur.In the circuit breaker of the prior art, no measure is provided to prevent the appearance of an arc between the secondary contacts when the circuit breaker is closed. However, this arc is responsible for increasing the closing operation energy and causes additional wear of the circuit breaker.

Selon une réalisation préférée aucun arc entre les contacts secondaires ne s'amorce à l'enclenchement.According to a preferred embodiment, no arc between the secondary contacts begins to engage.

La structure du disjoncteur de l'invention est analogue à celle décrite dans le document FR-A-2 576 142; en particulier les contacts d'arc fixe et mobile sont des tubes coaxiaux définissant un cylindre de soufflage fermé par un piston fixe à l'extrémité duquel est disposée une buse de soufflage.The structure of the circuit breaker of the invention is similar to that described in document FR-A-2 576 142; in particular the fixed and movable arcing contacts are coaxial tubes defining a blowing cylinder closed by a fixed piston at the end of which is a blowing nozzle.

La présente invention a pour objet un disjoncteur à haute tension à gaz diélectrique sous pression, du type comprenant au moins une chambre de coupure comportant une enveloppe isolante remplie dudit gaz à l'intérieur de laquelle sont placés un ensemble fixe comportant un contact principal fixe et un contact d'arc fixe, un ensemble mobile comportant notamment un contact principal mobile et un contact d'arc mobile, la chambre de coupure comportant en outre un cylindre de soufflage débouchant dans une buse de soufflage, un piston de soufflage fixe et une paire de contacts secondaires, caractérisé en ce que ledit cylindre de soufflage est délimité par un premier tube constituant le contact d'arc mobile, par un second tube constituant le contact principal mobile et par ledit piston de soufflage fixe, que ledit premier tube et un troisième tube lié à l'ensemble fixe et concentrique audit premier tube délimitent, de l'autre côté du piston de soufflage fixe, un volume variable contenant les contacts secondaires, fermé d'un côté par un piston de fermeture et de l'autre côté par un piston annulaire d'extrémité lié audit premier tube et glissant le long dudit troisième tube, un premier contact secondaire étant solidaire dudit troisième tube, le second contact secondaire étant entraîné par ledit premier tube et étant assujetti à se déplacer entre une première et une seconde position fixes le long dudit premier tube, les contacts secondaires venant, dans la première position correspondant à l'état enclenché du disjoncteur, en butée l'un contre l'autre, le second contact secondaire venant, dans la seconde position, en butée sur une butée dudit troisième tube de manière à limiter la longueur maximale de séparation des contacts secondaires à une valeur inférieure à la longueur maximale de séparation des contacts d'arc.The subject of the present invention is a high-voltage circuit breaker with pressurized dielectric gas, of the type comprising at least one breaking chamber comprising an insulating envelope filled with said gas inside which are placed a fixed assembly comprising a fixed main contact and a fixed arcing contact, a movable assembly comprising in particular a movable main contact and a movable arcing contact, the breaking chamber further comprising a blowing cylinder opening into a blowing nozzle, a fixed blowing piston and a pair of secondary contacts, characterized in that that said blowing cylinder is delimited by a first tube constituting the movable arcing contact, by a second tube constituting the movable main contact and by said fixed blowing piston, that said first tube and a third tube connected to the fixed assembly and concentric with said first tube define, on the other side of the fixed blow piston, a variable volume containing the secondary contacts, f closed on one side by a closing piston and on the other side by an annular end piston linked to said first tube and sliding along said third tube, a first secondary contact being integral with said third tube, the second secondary contact being driven by said first tube and being subject to move between a first and a second fixed position along said first tube, the secondary contacts coming, in the first position corresponding to the engaged state of the circuit breaker, to abut one against the other, the second secondary contact coming, in the second position, into abutment on an abutment of said third tube so as to limit the maximum length of separation of the secondary contacts to a value less than the maximum length of separation of the arcing contacts.

Dans un mode particulier de réalisation, le second contact secondaire est muni d'un moyen d'encliquetage coopérant avec des gorges pratiquées dans ledit premier tube pour bloquer ledit second contact secondaire dans lesdites positions fixes, ledit ensemble mobile comprenant un contact coopérant avec un contact solidaire de l'ensemble fixe pour mettre ledit second contact secondaire au potentiel dudit premier contact secondaire pendant la phase de réenclenchement du disjoncteur.In a particular embodiment, the second secondary contact is provided with a latching means cooperating with grooves made in said first tube to block said second secondary contact in said fixed positions, said movable assembly comprising a contact cooperating with a contact integral with the fixed assembly to put said second secondary contact to the potential of said first secondary contact during the phase of circuit breaker reset.

En ce qui concerne d'autres modes de réalisation préférés, référence est faite aux revendications 3 à 5.With respect to other preferred embodiments, reference is made to claims 3 to 5.

L'invention sera bien comprise par la description donnée ci-après d'un mode préféré de réalisation d'un disjoncteur selon l'invention dans lequel :

  • la figure 1 est une vue partielle en demi-coupe axiale de la chambre de coupure d'un disjoncteur selon l'invention, en position enclenchée,
  • la figure 2 est une vue similaire au cours d'une ouverture sur coupure de courant de faible intensité,
  • la figure 3 est une vue similaire montrant la fin de la manoeuvre d'ouverture,
  • la figure 4 est une vue similaire illustrant la fermeture du disjoncteur,
  • la figure 5 est une vue similaire illustrant l'ouverture sur courant de forte intensité.
The invention will be better understood from the description given below of a preferred embodiment of a circuit breaker according to the invention in which:
  • FIG. 1 is a partial view in axial half-section of the breaking chamber of a circuit breaker according to the invention, in the engaged position,
  • FIG. 2 is a similar view during an opening on a low current cut,
  • FIG. 3 is a similar view showing the end of the opening maneuver,
  • FIG. 4 is a similar view illustrating the closing of the circuit breaker,
  • Figure 5 is a similar view illustrating the opening on high intensity current.

La figure 1 montre une chambre de coupure comprenant une enveloppe 1, en matériau isolant tel que la céramique, remplie d'un gaz diélectrique tel que l'héxafluorure de soufre sous une pression de quelques bars. A l'intérieur de l'enveloppe, on trouve un ensemble comprenant un contact principal fixe formé de doigts de contacts 2 protégés par un capot pare-effluves 3 et un contact d'arc formé d'un tube métallique 4 terminé par une extrémité 4A en alliage résistant aux effets de l'arc.FIG. 1 shows a breaking chamber comprising an envelope 1, made of an insulating material such as ceramic, filled with a dielectric gas such as sulfur hexafluoride under a pressure of a few bars. Inside the envelope, there is an assembly comprising a fixed main contact formed by contact fingers 2 protected by a corona hood 3 and an arcing contact formed by a metal tube 4 terminated by one end 4A alloy resistant to the effects of the arc.

L'équipage mobile comprend un tube 5, métallique, servant de contact d'arc mobile, terminé par un embout 5A en alliage résistant aux effets de l'arc.The moving element comprises a metal tube 5 serving as a moving arcing contact, terminated by a tip 5A made of an alloy resistant to the effects of the arcing.

Le tube 5 est entraîné par un tube métallique 6, par exemple en aluminium, fixé à une tige de manoeuvre non représentée. Les tubes 5 et 6 ne sont pas fixés l'un à l'autre ; au contraire, un certain débattement entre eux est possible ; l'entraînement se fait grâce à deux redans 5B et 6B des tubes 5 et 6. Le débattement est limité par une butée 6C.The tube 5 is driven by a metal tube 6, for example of aluminum, fixed to an operating rod, not shown. Tubes 5 and 6 are not attached to each other; on the contrary, a certain clearance between them is possible; the drive is done by two steps 5B and 6B of the tubes 5 and 6. The travel is limited by a stop 6C.

Un tube métallique 7, concentrique au tube 5, sert de contact principal mobile.A metal tube 7, concentric with the tube 5, serves as a movable main contact.

Il porte une buse de soufflage 8 en matériau isolant. Il est en contact électrique avec un bloc métallique 9, en aluminium par exemple, solidaire de l'équipage fixe, par des doigts de contact 10.It carries a blowing nozzle 8 made of insulating material. It is in electrical contact with a metal block 9, made of aluminum for example, secured to the fixed assembly, by contact fingers 10.

Le tube 5 et le tube 7 sont solidarisés par une couronne isolante 12, percée de trous 12A.The tube 5 and the tube 7 are joined by an insulating ring 12, pierced with holes 12A.

Le volume 20 délimité par les tubes 5 et 7 est fermé par un piston fixe 14, en matériau isolant tel que le polytétrafluoroéthylène, maintenu en place par un tube métallique 15 fixé au bloc 9.The volume 20 delimited by the tubes 5 and 7 is closed by a fixed piston 14, made of an insulating material such as polytetrafluoroethylene, held in place by a metal tube 15 fixed to the block 9.

On désigne par 20 le volume délimité par les tubes 5 et 7, la couronne 12 et le piston 14. Ce volume constitue le cylindre de soufflage du disjoncteur.The volume delimited by the tubes 5 and 7, the ring 12 and the piston 14 is designated by 20. This volume constitutes the blow-out cylinder of the circuit breaker.

Le piston 14 est percé d'orifices 16 et comprend un clapet 17 n'autorisant le passage du gaz que de l'extérieur vers l'intérieur du volume 20. Le piston 14 comprend un joint d'étanchéité 18 et un guidage 19.The piston 14 is pierced with orifices 16 and includes a valve 17 authorizing the passage of gas only from the outside to the inside of the volume 20. The piston 14 comprises a seal 18 and a guide 19.

Les orifices 16 du piston 14 peuvent être obstrués par un piston annulaire 22, pouvant glisser dans l'espace annulaire constitué par le tube 5 et un prolongement cylindrique 23, percé de trous 23A, du piston 14. Le piston annulaire 22 est poussé contre les orifices 16 par un ressort 24 s'appuyant contre une partie solidaire du tube fixe 15. L'étanchéité du piston est assurée par des joints 26 et 27.The orifices 16 of the piston 14 can be obstructed by an annular piston 22, which can slide in the annular space formed by the tube 5 and a cylindrical extension 23, pierced with holes 23A, of the piston 14. The annular piston 22 is pushed against the orifices 16 by a spring 24 pressing against an integral part of the fixed tube 15. The piston is sealed by seals 26 and 27.

Une paire de contact auxiliaire comprend :

  • un contact tubulaire fixe 30, muni d'une extrémité 30A en matériau résistant à l'arc, et fixé au tube fixe 15,
  • un contact tubulaire 31, muni d'une extrémité d'usure 31A, fixé à un bloc de guidage en matériau isolant 32, et muni de contacts glissants 31B coopérant avec le tube 5.
A pair of auxiliary contacts includes:
  • a fixed tubular contact 30, provided with an end 30A of arc-resistant material, and fixed to the fixed tube 15,
  • a tubular contact 31, provided with a wear end 31A, fixed to a guide block made of insulating material 32, and provided with sliding contacts 31B cooperating with the tube 5.

Le bloc isolant est guidé dans l'espace annulaire compris entre les tubes 5 et 15 grâce à une portion 32A venant en appui contre le tube 15.The insulating block is guided in the annular space between the tubes 5 and 15 thanks to a portion 32A coming to bear against the tube 15.

Cette portion est munie d'orifices 33 pour permettre le libre passage du gaz dans le volume 35 compris entre le tube 15 et les pièces 31, 32 et 42.This portion is provided with orifices 33 to allow the free passage of gas in the volume 35 comprised between the tube 15 and the parts 31, 32 and 42.

La pièce isolante 32 est munie d'un système d'encliquetage, par exemple à billes 36 et ressorts 37, coopérant avec des gorges 38 et 39 pratiquées dans le tube 5. Une butée 40 du tube 15 limite la course de la pièce isolante 32.The insulating part 32 is provided with a latching system, for example with balls 36 and springs 37, cooperating with grooves 38 and 39 formed in the tube 5. A stop 40 of the tube 15 limits the stroke of the insulating part 32 .

Le volume 35 est fermé par un piston annulaire d'extrémité 42 isolant, fixé au tube 5 et possédant un segment de guidage 43 et un clapet 44 n'autorisant le passage du gaz que de l'extérieur vers l'intérieur du volume 35.The volume 35 is closed by an annular insulating end piston 42, fixed to the tube 5 and having a guide segment 43 and a valve 44 allowing the passage of gas only from the outside to the inside of the volume 35.

Le tube 5 porte a son extrémité des trous 46. De même le tube 6 possède des trous 47.The tube 5 has holes 46 at its end. Similarly, the tube 6 has holes 47.

La pièce 9 porte un contact 48 coopérant avec une extrémité 49 du tube 5 pour placer le tube 5 au même potentiel que le reste de l'équipage mobile en fin de course d'ouverture.The part 9 carries a contact 48 cooperating with one end 49 of the tube 5 to place the tube 5 at the same potential as the rest of the moving assembly at the end of the opening stroke.

Le fonctionnement du disjoncteur est le suivant.The circuit breaker works as follows.

Lorsque le disjoncteur est fermé (position de la figure 1), le courant passe par les doigts 2, le tube 7, les doigts 10 et la pièce 9.When the circuit breaker is closed (position in FIG. 1), the current flows through the fingers 2, the tube 7, the fingers 10 and the part 9.

Coupure des faibles courantsCutting of weak currents

Il s'agit des courants inférieurs ou égaux au courant nominal de l'installation. A l'ouverture du disjoncteur (figure 2), l'équipage mobile est entraîné par le tube 6. A la séparation des contacts un arc 50 jaillit entre les contacts d'arc 4B et 5A. L'augmentation de pression dans la chambre 20 repousse le piston 22, contre l'action du ressort 24, de sorte que la pression dans la chambre reste constante et faible, le gaz trouvant une expansion facile par les trous 16 et 23A.These are currents less than or equal to the nominal current of the installation. At the opening of the circuit breaker (Figure 2), the movable assembly is driven by the tube 6. When the contacts are separated, an arc 50 erupts between the arcing contacts 4B and 5A. The increase in pressure in the chamber 20 pushes the piston 22 against the action of the spring 24, so that the pressure in the chamber remains constant and low, the gas finding an easy expansion through the holes 16 and 23A.

La dépression engendrée dans le volume 35 provoque l'ouverture du clapet 44 et le maintien de la pression dans le volume 35. Il n'y a donc pas de perte par succion.The vacuum generated in the volume 35 causes the valve 44 to open and the pressure in the volume 35 to be maintained. There is therefore no loss by suction.

L'arc 60, qui s'établit entre les contacts 30 et 31 soit en même temps que l'arc 50, soit légèrement avant, soit légèrement après, crée une surpression suffisamment faible pour ne pas perturber ce fonctionnement.The arc 60, which is established between the contacts 30 and 31 either at the same time as the arc 50, either slightly before or slightly after, creates a sufficiently low overpressure so as not to disturb this operation.

Avant que le courant ne soit coupé par l'action de la séparation des contacts, le courant passe par le contact 4, l'arc 50, le tube 5, les contacts 31B, le contact 31, l'arc 60, le contact 30, le tube 15 et la pièce 9.Before the current is cut by the action of the separation of the contacts, the current passes through contact 4, arc 50, tube 5, contacts 31B, contact 31, arc 60, contact 30 , the tube 15 and the part 9.

Après une certaine course, déterminée en fonction du courant de court-circuit la pièce 32A vient en butée sur la butée 40. Le tube 5 poursuivant sa course, les billes 36 quittent la gorge 39 et viennent se positionner sur la gorge 38 (figure 3) en fin de manoeuvre d'ouverture et la légère surpression du volume 20 disparait grâce aux trous 23A ; le piston 22 revient en butée contre le piston fixe 14. Le contact 48 met l'extrémité 49 du tube 5, et donc le contact 31, au potentiel de la pièce 9, du tube 15 et donc du contact 30.After a certain stroke, determined as a function of the short-circuit current, the part 32A abuts on the stop 40. The tube 5 continuing its stroke, the balls 36 leave the groove 39 and come to be positioned on the groove 38 (FIG. 3 ) at the end of the opening maneuver and the slight overpressure of the volume 20 disappears thanks to the holes 23A; the piston 22 abuts against the fixed piston 14. The contact 48 puts the end 49 of the tube 5, and therefore the contact 31, at the potential of the part 9, of the tube 15 and therefore of the contact 30.

On voit que grâce aux dispositions de l'invention, la distance maximale de séparation des contacts secondaires reste inférieure à celle des contacts d'arc, de sorte qu'aucun risque d'amorçage dû à un trop grand étirement de l'arc secondaire n'est à craindre.We see that thanks to the provisions of the invention, the maximum separation distance of the secondary contacts remains less to that of the arcing contacts, so that there is no risk of ignition due to excessive stretching of the secondary arcing.

Fermeture du disjoncteurCircuit breaker closing

Le tube 6 est actionné vers la gauche de la figure (figure 4). La butée 6C entraîne le tube 5 et les contacts 30 et 31 viennent en contact, sans création d'arc puisqu'il sont au même potentiel grâce au contact des pièces 48 et 49. La légère surpression dans le volume 35 s'évacue, par les trous 46 et 47 qui viennent en coïncidence, vers le volume 70 intérieur au tube 5. Lorsque le contact 30A vient en butée contre le bloc portant le contact 31, les billes 36 quittent la gorge 38 pour revenir se placer sur la gorge 39 en fin de manoeuvre d'enclenchement.The tube 6 is actuated to the left of the figure (Figure 4). The stop 6C drives the tube 5 and the contacts 30 and 31 come into contact, without creating an arc since they are at the same potential thanks to the contact of the parts 48 and 49. The slight overpressure in the volume 35 is evacuated, by the holes 46 and 47 which coincide, towards the volume 70 inside the tube 5. When the contact 30A abuts against the block carrying the contact 31, the balls 36 leave the groove 38 to return to be placed on the groove 39 in end of switching operation.

En fin de manoeuvre de fermeture on retrouve la configuration de la figure 1.At the end of the closing operation, we find the configuration of FIG. 1.

On voit que grâce à la disposition de l'invention tout amorçage à la fermeture du disjoncteur est exclus au niveau des contacts secondaires.It can be seen that, thanks to the arrangement of the invention, any ignition on closing of the circuit breaker is excluded at the level of the secondary contacts.

Toute résistance due à une éventuelle dépression dans la chambre 20 est évitée par l'ouverture du clapet 17.Any resistance due to a possible depression in the chamber 20 is avoided by the opening of the valve 17.

Coupure des courant de grande intensitéHigh current cutoff

Il s'agit des courants de court-circuit.These are short-circuit currents.

La figure 5 montre le disjoncteur en cours d'ouverture par déplacement du tube 6 vers la droite de la figure.Figure 5 shows the circuit breaker being opened by moving the tube 6 to the right of the figure.

L'arc 60, de très forte intensité, provoque un échauffement rapide du volume 35 et du volume 35B entouré par les contacts 30, 31, le piston 22 et le cylindre 5.The very high intensity arc 60 causes rapid heating of the volume 35 and of the volume 35B surrounded by the contacts 30, 31, the piston 22 and the cylinder 5.

L'augmentation de pression a deux effets :

  • le premier effet est de plaquer le piston 22 contre le piston 14 et de fermer ainsi toute communication entre le volume 35B et le volume 20. La pression croissant dans le volume 20 favorise l'extinction de l'arc primaire 50 par un autosoufflage favorisé par la réduction de grandeur du volume 20 en raison du déplacement de l'équipage mobile 5, 7, par rapport au piston fixe 14.
  • le deuxième effet est d'exercer une pression sur le piston isolant 42 et d'apporter ainsi une contribution à l'énergie de manoeuvre.
The increase in pressure has two effects:
  • the first effect is to press the piston 22 against the piston 14 and thus close any communication between the volume 35B and the volume 20. The increasing pressure in the volume 20 promotes the extinction of the primary arc 50 by a self-blowing favored by the reduction in size of the volume 20 due to the displacement of the movable assembly 5, 7, relative to the fixed piston 14.
  • the second effect is to exert pressure on the insulating piston 42 and thus make a contribution to the energy of maneuver.

Pour cela le gaz chaud du volume 35 passe à travers les orifices 33 de la pièce 32A.For this, the hot gas of volume 35 passes through the orifices 33 of the part 32A.

La refermeture du disjoncteur après une telle manoeuvre d'ouverture sur courant de forte intensité s'effectue comme il a été décrit précédemment sous le chapitre : fermeture du disjoncteur. Les trous 46 et 47 revenant en face l'un de l'autre, la surpression du volume 35 est évacuée dans le volume 70.The reclosing of the circuit breaker after such an opening operation on high current is carried out as described previously in the chapter: closing of the circuit breaker. The holes 46 and 47 returning opposite one another, the overpressure of volume 35 is evacuated in volume 70.

Le disjoncteur de l'invention ne nécessite qu'une faible énergie de manoeuvre pour toutes les valeurs de courant à couper. Le nombre d'éléments est faible et ils sont tous de révolution ce qui assure une construction économique et un montage facile et rapide.The circuit breaker of the invention requires only a low operating energy for all the current values to be cut. The number of elements is low and they are all of revolution which ensures an economical construction and an easy and fast assembly.

Claims (5)

  1. High tension circuit breaker containing a dielectric gas under pressure, the circuit breaker being of the type comprising at least one interrupting chamber comprising an insulating envelope filled with said gas and containing a fixed assembly including a fixed main contact (2) and a fixed arcing contact (4), and a moving assembly including a moving main contact (7) and a moving arcing contact (5), the interrupting chamber also containing a blast cylinder (20) opening out into a blast nozzle (8), a fixed blast piston (14), and a pair of secondary contacts (30, 31), the circuit breaker being characterized in that the said blast cylinder (20) is delimited by a first tube (5) constituting the moving arcing contact, by a second tube (7) constituting the moving main contact and by the said fixed blast piston (14), the said first tube (5) and a third tube (15) being connected to the fixed assembly and concentric with the first tube (5) delimiting a variable volume (35, 35B) containing secondary contacts (30, 31) on the other side the fixed blast piston (14), said first tube being closed on one side by a closing piston (22) and closed at the other side by an annular end piston (42), connected to said first tube (5) and sliding along said third tube (15), a first secondary contact (30) being secured to said third tube (15), the second secondary contact (31) being driven by said first tube (5), and being constrained to move between first and second fixed positions along said first tube (5), the secondary contacts coming into abutment against one another in the first position corresponding to the circuit breaker's closed state, the second secondary contact (31) is stopped in the second position by an abutment (40) of the said third tube (15) in such a way as to limit the maximum separation length between the secondary contacts to a value which is less than the maximum separation length between the arcing contacts.
  2. A circuit breaker according to claim 1, characterized in that the second secondary contact (31) is equipped with catch means (36, 37) co-operating with grooves (38, 39) formed in said first tube (5) in order to hold the said second secondary contacts (31) in said fixed positions, said moving assembly comprising a contact (49) co-operating with a contact (48) secured to the fixed assembly in order to put said second secondary contact (31) at the potential of said first secondary contact (30) during circuit breaker reclosing.
  3. A circuit according to any one of claims 1 to 2, characterized in that the piston (14) closing the blast cylinder (20) includes a non-return valve (17) allowing gas to pass only from the outside towards the inside of said cylinder.
  4. A circuit breaker according to any one of claims 1 to 3, characterized in that said annular end piston (42) includes a non-return valve (44) allowing gas to pass only from the outside towards the inside of the volume (35, 35B) containing the secondary contacts (30, 31).
  5. A circuit breaker according to any one of claims 1 to 4, characterized in that the said first tube (5) is connected to a drive tube (6) with a degree of lost motion being allowed therebetween so as to enable holes (47) through the said first tube (5) to be put into coincidence with holes (47) provided through said drive tube (6) when the circuit breaker is reclosed in order to evacuate excess pressure in the volume (35) containing the secondary contacts (30, 31).
EP89104558A 1988-03-23 1989-03-15 High-tension switch with a reduced driving energy Expired - Lifetime EP0334181B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89104558T ATE99829T1 (en) 1988-03-23 1989-03-15 HIGH VOLTAGE, LOW DRIVING ENERGY SWITCH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8803803A FR2629260B1 (en) 1988-03-23 1988-03-23 HIGH-VOLTAGE LOW-ENERGY CIRCUIT BREAKER
FR8803803 1988-03-23

Publications (2)

Publication Number Publication Date
EP0334181A1 EP0334181A1 (en) 1989-09-27
EP0334181B1 true EP0334181B1 (en) 1994-01-05

Family

ID=9364564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104558A Expired - Lifetime EP0334181B1 (en) 1988-03-23 1989-03-15 High-tension switch with a reduced driving energy

Country Status (9)

Country Link
US (1) US4945198A (en)
EP (1) EP0334181B1 (en)
JP (1) JP2577080B2 (en)
CN (1) CN1017578B (en)
AT (1) ATE99829T1 (en)
BR (1) BR8901362A (en)
CA (1) CA1309443C (en)
DE (1) DE68911962T2 (en)
FR (1) FR2629260B1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647255B1 (en) * 1989-05-17 1993-04-23 Alsthom Gec HIGH VOLTAGE CIRCUIT BREAKER WITH BLOWING DIELECTRIC GAS
FR2661550B1 (en) * 1990-04-26 1992-06-12 Alsthom Gec HIGH VOLTAGE CIRCUIT BREAKER WITH SERIES ARC.
ES2089590T3 (en) * 1992-02-06 1996-10-01 Gec Alsthom T & D Ag PRESSURE GAS SWITCH.
FR2691575B1 (en) * 1992-05-25 1994-07-01 Alsthom Gec HIGH VOLTAGE CIRCUIT BREAKER WITH NON ZERO CURRENT PASSAGES.
FR2742576B1 (en) * 1995-12-14 1998-01-09 Gec Alsthom T & D Sa HIGH VOLTAGE CIRCUIT BREAKER WITH REDUCED POWER
DE19629475A1 (en) 1996-07-10 1998-01-15 Siemens Ag Pressurized gas circuit breaker
FR2764728B1 (en) * 1997-06-12 1999-09-24 Gec Alsthom T & D Sa CLOSING RESISTANCE CIRCUIT BREAKER
FR2947377B1 (en) * 2009-06-29 2011-07-22 Areva T & D Sa DISCHARGE VALVE VALVE FOR DISCHARGING A DIELECTRIC GAS BETWEEN TWO VOLUMES OF A HIGH OR MEDIUM VOLTAGE BREAKER BREAK CHAMBER
CN101930871B (en) * 2010-08-25 2012-11-21 中国西电电气股份有限公司 Arc extinguish chamber with high current-carrying capability for high-voltage switch equipment
EP3155627B1 (en) * 2014-06-13 2019-08-28 ABB Schweiz AG Interrupter driven resistor switch assembly

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2610763A1 (en) * 1987-02-09 1988-08-12 Alsthom Circuit breaker with low actuating energy

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE21848E (en) * 1936-02-27 1941-07-01 Electric circuit breaker
DE2349263C2 (en) * 1973-10-01 1982-08-26 Brown, Boveri & Cie Ag, 6800 Mannheim Electric pressure gas switch
GB1596867A (en) * 1978-05-30 1981-09-03 Aei Gas blast switches and circuit interrupters
DE3224778C2 (en) * 1981-03-30 1986-06-05 Ernst Prof. Dr.techn.habil. 1000 Berlin Slamecka Electrical switching chamber with auxiliary arc for an autopneumatic pressure gas switch
FR2535518B1 (en) * 1982-10-28 1985-10-25 Alsthom Atlantique CUTTING CHAMBER FOR GAS CIRCUIT BREAKER
DE8334983U1 (en) * 1983-12-02 1988-02-11 Siemens AG, 1000 Berlin und 8000 München Electric pressure gas switch
FR2576142B1 (en) * 1985-01-16 1987-12-24 Alsthom Atlantique HIGH VOLTAGE CIRCUIT BREAKER, COMPRESSED GAS, HANDLING ENERGY ASSISTED BY THE ARC THERMAL EFFECT
JP2521262B2 (en) * 1986-07-07 1996-08-07 株式会社日立製作所 Puffer type gas circuit breaker
FR2619246B1 (en) * 1987-08-03 1989-11-17 Alsthom HIGH OR MEDIUM VOLTAGE CIRCUIT BREAKER UNDER PRESSURE WITH CURING ENERGY TAKEN FROM THE ARC

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2610763A1 (en) * 1987-02-09 1988-08-12 Alsthom Circuit breaker with low actuating energy

Also Published As

Publication number Publication date
DE68911962T2 (en) 1994-04-28
FR2629260A1 (en) 1989-09-29
JPH02148526A (en) 1990-06-07
US4945198A (en) 1990-07-31
EP0334181A1 (en) 1989-09-27
FR2629260B1 (en) 1994-07-08
CA1309443C (en) 1992-10-27
BR8901362A (en) 1989-11-07
DE68911962D1 (en) 1994-02-17
JP2577080B2 (en) 1997-01-29
ATE99829T1 (en) 1994-01-15
CN1036659A (en) 1989-10-25
CN1017578B (en) 1992-07-22

Similar Documents

Publication Publication Date Title
EP0239068A1 (en) Gas blast switch
EP0334181B1 (en) High-tension switch with a reduced driving energy
EP0367072B1 (en) Gas-blast circuit interrupter for highpotential
EP0359224B1 (en) High-tension circuit breaker using a dielectric gas for blasting
EP0239932B1 (en) High-tension gas blast circuit breaker
EP0302390B1 (en) High or medium voltage gas blast circuit breaker with opening energy taken from the arc energy
FR2696274A1 (en) Self-blowing high voltage circuit breaker having a reduced gas compression interrupting chamber.
EP0380907B1 (en) High and medium voltage gas blast circuit breaker
FR2576144A1 (en) HIGH VOLTAGE, COMPRESSED GAS, LOW-ENERGY CIRCUIT BREAKER
EP0406794B1 (en) High or middle tension circuit breaker
EP0759629B1 (en) Circuit breaker with closing resistor and insertion device
EP0400523B1 (en) High tension gas blast circuit-breaker
EP0398213B1 (en) Middle high-voltage circuit breaker for high nominal current
FR2610763A1 (en) Circuit breaker with low actuating energy
EP0458236B1 (en) Medium high voltage circuit breaker
FR2535518A1 (en) CUTTING CHAMBER FOR GAS CIRCUIT BREAKER
CH688702A5 (en) High-voltage switch having an arc extinguishing chamber variable blast volume.
FR2640420A2 (en) High-voltage circuit breaker with low operating energy
FR2705494A1 (en) Circuit breaker with operation assisted by electrodynamic means
CH681751A5 (en) High voltage circuit breaker
FR2586136A1 (en) High-density sulphur hexafluoride circuit breaker

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: GEC ALSTHOM SA

17P Request for examination filed

Effective date: 19900319

17Q First examination report despatched

Effective date: 19921117

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940105

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19940105

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19940105

Ref country code: AT

Effective date: 19940105

REF Corresponds to:

Ref document number: 99829

Country of ref document: AT

Date of ref document: 19940115

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940114

REF Corresponds to:

Ref document number: 68911962

Country of ref document: DE

Date of ref document: 19940217

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940331

Ref country code: BE

Effective date: 19940331

ITF It: translation for a ep patent filed

Owner name: JACOBACCI CASETTA & PERANI S.P.A.

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
BERE Be: lapsed

Owner name: S.A. GEC ALSTHOM

Effective date: 19940331

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
EAL Se: european patent in force in sweden

Ref document number: 89104558.5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970213

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19970214

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19970220

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19970221

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19970226

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980315

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980316

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980331

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19980331

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980331

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980315

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19981201

EUG Se: european patent has lapsed

Ref document number: 89104558.5

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050315