EP0136965B1 - Sectionneur pour appareillage de commutation haute tension logé dans une enceinte métallique à gaz comprimé - Google Patents

Sectionneur pour appareillage de commutation haute tension logé dans une enceinte métallique à gaz comprimé Download PDF

Info

Publication number
EP0136965B1
EP0136965B1 EP84730086A EP84730086A EP0136965B1 EP 0136965 B1 EP0136965 B1 EP 0136965B1 EP 84730086 A EP84730086 A EP 84730086A EP 84730086 A EP84730086 A EP 84730086A EP 0136965 B1 EP0136965 B1 EP 0136965B1
Authority
EP
European Patent Office
Prior art keywords
insulating tube
contact
resistors
disconnect switch
resistor
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
Application number
EP84730086A
Other languages
German (de)
English (en)
Other versions
EP0136965A1 (fr
Inventor
Winfried Dr.-Ing. Schulz
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0136965A1 publication Critical patent/EP0136965A1/fr
Application granted granted Critical
Publication of EP0136965B1 publication Critical patent/EP0136965B1/fr
Expired 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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/16—Impedances connected with contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/32—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with rectilinearly-movable contact

Definitions

  • the invention relates to a disconnector for metal-encapsulated, compressed gas-insulated high-voltage switchgear with two cylindrical contact pieces, which may be surrounded by field electrodes and touch each other in the closed position, for which purpose during switching at least one contact piece moves on a common longitudinal axis, in which within a contact piece or one Field electrode, a movable insulating tube is arranged, which bridges the separation distance between the switching elements for as long as the switching elements are moved during switching.
  • Such a circuit breaker is known from DE-A-27 04 389 (GB-A-15 44 398).
  • This insulating tube which conducts the switching element, bridges the isolating path in each case in an arc-impermeable manner before the switching element comes into galvanic contact with the counter switching element.
  • the movement of the insulating tube is triggered by the movement of the contact piece.
  • the insulating tube thus forms a flashover cage which bridges the separation distance before the flashover distance is reached by the switching element.
  • the invention is also based on the problem of high-frequency vibrations in compressed gas-insulated, encapsulated high-voltage switchgear. It was recognized that some frequencies of these broadband high-frequency vibrations could possibly resonate with the natural frequencies resulting from the dimensions of the encapsulated high-voltage switchgear. Then, due to their reflection, standing waves arise within the encapsulated high-voltage switchgear, in whose local current maxima the flashover resistance may be reduced to such an extent that a flashover to metal encapsulation can occur there.
  • the invention has for its object to avoid such a high-frequency resonance vibration.
  • the invention is based on a disconnector for metal-encapsulated, compressed gas-insulated high-voltage switchgear with two cylindrical contact pieces, which may be surrounded by field electrodes and touch each other in the closed position, for which purpose at least one contact piece moves on a common longitudinal axis during switching, in which a movable insulating tube is arranged within a contact piece or a field electrode, which essentially bridges the separation distance between the contact pieces during switching as long as the contact pieces are moved.
  • This isolating switch is designed according to the invention so that there are two movable resistors of approximately the same size, of low induction and low capacitance, on the longitudinal axis, each of which is electrically connected or connectable to one of the switching elements External dimensions are smaller than the inner diameter of the insulating tube and which are introduced into the isolating section at the start of the switching movement and which, after at least largely bridging the isolating section through the isolating tube, also bridge them before the opposing contact pieces are brought into contact with one another or with the field electrodes.
  • a flashover arc can only form between the two resistors having different potential. Due to the damping effect of the resistors, the generation of high-frequency vibrations is prevented. In addition, the flashover arc cannot migrate to the encapsulation and thus trigger an earth short-circuit because it is shielded from the insulating tube that covers the separation distance. As a result of the use of two resistors of approximately the same size, the flashover arc burns approximately in the middle of the separation distance between the field electrodes. This results in the lowest capacitive coupling to the two line ends and a symmetrical damping of the high-frequency vibrations that arise.
  • the resistors have a thermally highly conductive ceramic carrier with solid metal contact, since they are exposed to the effects of arcing and the associated heating. It is expedient to make the metal contacts resilient at least on one of the mutually facing end faces of the resistors, so that an impact load on the resistors during switching is avoided. Neither their effectiveness nor their lifespan should be affected by the arcs.
  • the level of the resistance value results from the intrinsic capacity of the line to be disconnected, the operating voltage and the mains frequency. It is expedient that the voltage drop across the resistors, caused by the reactive current, does not exceed 1 to 2% of the operating voltage, because otherwise voltage surges occur again when the damping resistors are bridged.
  • the occurrence of sliding sparks on the surface of the insulating tube is avoided because it does not come into contact with the field electrode opposite.
  • other means can also be provided or combined therewith in order to avoid sliding sparks, e.g. B. in which the insulating tube is formed very highly ohmic semiconducting or that ribs are provided on its surface.
  • FIGS. 1 to 7 show, schematically represented, longitudinal sections through a disconnector designed according to the invention. 4 to 4 show a first exemplary embodiment, and FIGS. 5 to 7 show a second, somewhat modified exemplary embodiment. Only the parts necessary for understanding the invention are shown without the metal encapsulation. The same reference numerals are used for the same parts.
  • the first exemplary embodiment shown in FIGS. 1 to 4 is a disconnector for a metal-encapsulated high-voltage switchgear which is insulated with pressurized gas, in particular SF 6 , and which has two coaxial, opposing cylindrical contact pieces 1 and 2, which have the form of field electrodes . Between these, in the switched-off position, there is the isolating section 3, which is indicated by arrows. Inside the hollow cylindrical switching piece 2 on the right is a contact tube 4, which is galvanically connected to the switching piece 2 via a sliding contact 5 and thus has the same potential as this. This contact tube 4 has the function of a movable contact. On the front side, the contact tube 4 is provided with a bead 6 which, in the switched-on position, bears against the inwardly drawn edge 7 of the opposite contact piece 1.
  • this contact piece 1 there is also an insulating tube 8, which is provided with ribs 9 on its outer surface to avoid sliding sparks.
  • the outer diameter of the ribs 9 is smaller than the diameter of the edge 7 of the opening of the switching element 1.
  • two rod-shaped resistors 10 are also provided, which lie on the longitudinal axis of the switching elements 1 and 2.
  • the resistors 10 are constructed with low induction and capacitance and have a thermally highly conductive ceramic carrier, for example made of AL 2 0 3 . The resistance mass is burned in a suitable form on this.
  • the end faces 11 of the resistors are each provided with solid metal contacts.
  • the outside diameter of the resistors 10 is smaller than the inside diameter of the insulating tube 8.
  • Fig. 1 shows the switch-off position of the disconnector.
  • both the insulating tube 8 and the one resistor 10 are arranged in the interior of the left switching element 1 such that they do not protrude beyond the end face of the switching element 1.
  • the same applies to the switching piece 2 inside the other Resistor 10 and the contact tube 4 are.
  • the electrical field within the isolating section 3 is thus dependent on the shape of the contact pieces 1, 2 and is not disturbed by the internal parts.
  • Fig. 2 The start of the switch-on movement is shown in Fig. 2.
  • the insulating tube 8 is first moved out of the left switching piece 1 into the isolating section 3 until it reaches an end position which is at a distance 12 from the opposite switching piece 2, as indicated by arrows. This distance 12 is chosen so large that no sliding sparks can arise on the surface of the insulating tube.
  • the two resistors 10 are introduced symmetrically into the isolating section 3 from both sides by their own drive.
  • the residual separation path 13 remaining between its end faces 11 lies in the middle of the separation path 3.
  • a pre-flashover arc 14 occurs between the two resistors 10. Since this flashover arc 14 burns within the insulating tube 8 and protrudes sufficiently far, migration of the flashover arc 14 to the encapsulation is not possible because the insulating tube shields it.
  • no high-frequency oscillations can occur when the pre-flashover arc 14 is re-ignited.
  • the disconnector When the disconnector is opened, the movements of the individual parts run in reverse order. First, the contact tube 4 is drawn back into the interior of the contact piece 2 and the insulating tube 8 accordingly enters the isolating section 3 and bridges it to the distance 12. The two resistors 10 are withdrawn symmetrically from the isolating section 3 by means of their own drives and finally runs when the resistors 10 are in the rest position, the insulating tube 8 again out of the isolating section 3 until it is in its rest position inside the contact piece 1.
  • FIGS. 5 to 7 there is a standing cylindrical switching element 16 surrounded by a field electrode 15, which carries on its end face 17 a projection 18 which protrudes up to the end face of the field electrode 15.
  • This movable contact piece 19 is tubular and is in galvanic contact with the opposite field electrode 15 in its switched-on position.
  • the insulating tube 8 is arranged in the interior of the tubular contact piece 19, which has its own drive.
  • the high-resistance, semiconducting insulating tube 8 is provided with a metal contact 20 with a central opening 21, which in the closed position establishes the connection to the standing contact piece 16 with its extension 18.
  • This metal contact 20 is connected to one end of a resistor 22, which has a further metal contact 23 on its other end face.
  • This resistor 22 is fixed in the insulating tube 8 and moves together with it.
  • a second resistor 24 of the same size is arranged in the interior of the insulating tube 8, which is provided on its end face facing the isolating section with a resilient metal contact 25, while its other end is connected to its own drive, not shown.
  • the outer diameters of the resistors 22, 24 are each smaller than the inner diameter of the insulating tube 8.
  • Fig. 5 shows the off position of the circuit breaker, i. H. the movable tubular contact piece 19, like the insulating tube 8 with the two resistors 22 and 24, is located inside the field electrode 15.
  • the insulating tube 8 is first inserted into the isolating section 3 by means of its own drive and takes the first resistor 22 firmly connected to it until the electrical contact between the metal contact 20 and the stationary switching element 16 takes place. In this way, the resistor 22 is electrically connected to the standing contact piece 16 and maintains its potential. In this position, the entire isolating section 3 is bridged by the insulating tube 8. Then the second resistor 24 is guided inside the insulating tube 8 into the isolating section 3 by means of its own drive. This state is shown in Fig. 6.
  • the movement of the insulating tube 8 together with the resistor 22 can be relatively slow.
  • the resistor 24, on the other hand, should move faster so that a capacitive bridging between the resistor 24 and the movable contact piece 19 is avoided.
  • Fig. 7 shows the end position of the closed disconnector.
  • the individual parts move in reverse order. First, the movable contact piece 19 is retracted into its starting position inside the field electrode 15. Then the resistor 24 inside the insulating tube 8 is also brought back into its starting position. Finally, the insulating tube 8 is then removed from the isolating section 3 together with the resistor 22.

Landscapes

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

Claims (11)

1. Sectionneur pour des installations haute tension à blindage métallique et à isolation par un gaz sous pression, du type comportant deux pièces de contact cylindriques (1, 2, 4, 16, 19) qui sont éventuellement entourées d'électrodes de champ et qui se touchent dans la position de fermeture, ce pourquoi, pendant la fermeture, au moins une pièce de contact se déplace sur un axe longitudinal qui leur est commun, sectionneur dans lequel on prévoit à l'intérieur d'une pièces de contact ou d'une électrode de champ, un tube isolant mobile (8) qui, pendant la fermeture du sectionneur, comble de façon notable l'intervalle de coupure entre les pièces de contact tant que celles-ci sont déplacées, caractérisé par le fait que sur l'axe longitudinal sont situées deux résistances mobiles (10, 22, 24) sensiblement égales, conçues pour ne présenter qu'une faible induction et une faible capacité, et électriquement reliées ou susceptibles d'être reliées respectivement à l'une des pièces de contact (1, 2, 4, 16, 19), lesdites résistances ayant des dimensions extérieures qui sont inférieures au diamètre intérieur du tube isolant (6) et étant introduites au début de la fermeture du sectionneur, dans l'intervalle de coupure (3) qu'elles comblent après que le tube isolant (8) comble aussi, au moins largement, ledit intervalle de coupure, avant que les pièces de contact (1,4, 16, 19) situées l'une en face de l'autre se touchent ou soient amenées en contact avec les électrodes de champ (15).
2. Sectionneur selon la revendication 1, caractérisé par le fait que les résistances (10, 22, 24) comportent un support céramique thermiquement bon conducteur.
3. Sectionneur selon la revendication 1 ou 2, caractérisé par le fait que les résistances (24) portent, au moins sur l'une des faces frontales qui se situent en vis à vis, des contacts métalliques (25) réalisés de façon élastique.
4. Sectionneur selon la revendication 1, 2 ou 3, caractérisé par le fait que la chute de tension au niveau des résistances (10, 22, 24) est à peu près égale à 1 à 2 % de la tension de fonctionnement.
5. Sectionneur selon la revendication 1, 2, 3 ou 4, caractérisé par le fait que chaque résistance (10, 22, 24) est guidée symétriquement dans l'intervalle de coupure (3) par un mécanisme d'entraînement qui lui est propre, lorsque le tube isolant (8) a atteint sa position d'extrémité dans l'intervalle de coupure, qui laisse subsister une distance (12) par rapport à la pièce de contact opposée (2) ou de l'électrode de champ.
6. Sectionneur selon la revendication 6, caractérisé par le fait que la pièce de contact mobile (4) retire de l'intervalle de coupure (3), le tube isolant (8) lors du déplacement de fermeture.
7. Sectionneur selon la revendication 6, caractérisé par le fait que lors du mouvement de retour de la pièce de contact mobile (4), le tube isolant (8) est amené à nouveau dans sa position d'extrémité dans l'intervalle de coupure (3), avant que ne débute le mouvement de retour des résistances (10).
8. Sectionneur comportant une pièce de contact fixe et une pièce de contact commandée, selon la revendication 1, 2, 3 ou 4, caractérisé par le fait que la première résistance (22) est disposée de façon fixe dans l'extrémité antérieure du tube isolant (8), et se trouve en contact avec la pièce de contact fixe (16) située en face, lorsque le tube isolant (8) comble l'intervalle de coupure (3), et que la seconde résistance (24) est agencée de façon à être déplaçable à l'intérieur du tube isolant (8).
9. Sectionneur selon la revendication 8, caractérisé par le fait que le tube isolant (8), avec la première résistance (21), est déplacé dans l'intervalle de coupure (3), plus lentement que ne l'est la seconde résistance (24).
10. Sectionneur selon la revendication 1, caractérisé par le fait que le tube isolant (8) présente une semi-conductibilité très fortement ohmique.
EP84730086A 1983-09-01 1984-08-15 Sectionneur pour appareillage de commutation haute tension logé dans une enceinte métallique à gaz comprimé Expired EP0136965B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833331819 DE3331819A1 (de) 1983-09-01 1983-09-01 Trennschalter fuer metallgekapselte, druckgasisolierte hochspannungsschaltanlagen
DE3331819 1983-09-01

Publications (2)

Publication Number Publication Date
EP0136965A1 EP0136965A1 (fr) 1985-04-10
EP0136965B1 true EP0136965B1 (fr) 1987-03-18

Family

ID=6208154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84730086A Expired EP0136965B1 (fr) 1983-09-01 1984-08-15 Sectionneur pour appareillage de commutation haute tension logé dans une enceinte métallique à gaz comprimé

Country Status (8)

Country Link
US (1) US4539448A (fr)
EP (1) EP0136965B1 (fr)
JP (1) JPS6072119A (fr)
BR (1) BR8404326A (fr)
CA (1) CA1230629A (fr)
DE (2) DE3331819A1 (fr)
SU (1) SU1269754A3 (fr)
ZA (1) ZA846830B (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405850A1 (de) * 1984-02-16 1985-08-29 Siemens AG, 1000 Berlin und 8000 München Trennschalter fuer metallgekapselte, druckgasisolierte hochspannungsschaltanlagen
DE3832171A1 (de) * 1988-07-01 1990-01-04 Licentia Gmbh Einrichtung zur raschen ein- und ausschaltung von kleinen stroemen fuer trennschalter von v.i.s.
JP3437633B2 (ja) * 1994-03-31 2003-08-18 株式会社日立製作所 並列抵抗付き遮断器
US6313641B1 (en) 1995-03-13 2001-11-06 Square D Company Method and system for detecting arcing faults and testing such system
DE19543815A1 (de) * 1995-11-24 1997-05-28 Asea Brown Boveri Elektrisches Schaltgerät
US5933308A (en) * 1997-11-19 1999-08-03 Square D Company Arcing fault protection system for a switchgear enclosure
JP5188176B2 (ja) * 2007-12-28 2013-04-24 三菱電機株式会社 接地開閉器
DE102013210136A1 (de) * 2013-05-30 2014-12-04 Siemens Aktiengesellschaft Elektrisches Schaltgerät
WO2018036904A1 (fr) * 2016-08-26 2018-03-01 Abb Schweiz Ag Interrupteur et procédé de séparation des contacts d'un interrupteur

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1080200A (fr) * 1953-06-17 1954-12-07 Merlin Gerin Dispositif de protection de contacts de disjoncteurs
CA678008A (en) * 1960-02-05 1964-01-14 Westinghouse Electric Corporation Circuit interrupters
FR1514265A (fr) * 1967-01-09 1968-02-23 Merlin Gerin Interrupteur à auto-soufflage à résistance
FR2057344A5 (fr) * 1969-08-12 1971-05-21 Merlin Gerin
US3829707A (en) * 1973-02-09 1974-08-13 Allis Chalmers Gas insulated high voltage electrical transmission line with means for damping transients
IT1047627B (it) * 1974-10-01 1980-10-20 Reyrolle Parsons Ltd Perfezionamento negli interrutto ri per alte tensioni
DE2704389C3 (de) * 1977-01-31 1980-06-26 Siemens Ag, 1000 Berlin Und 8000 Muenchen Trennschalter für metallgekapselte Hochspannungsschaltanlagen
JPS5559613A (en) * 1978-10-30 1980-05-06 Tokyo Shibaura Electric Co Gas breaker
FR2450501A1 (fr) * 1979-03-02 1980-09-26 Alsthom Cgee Dispositif d'insertion de resistance a la fermeture d'un appareil d'interruption
GB2081976A (en) * 1980-08-08 1982-02-24 Ass Elect Ind Arc preventing in switches
DE3122442A1 (de) * 1981-06-02 1982-12-23 Siemens AG, 1000 Berlin und 8000 München Trennschalter fuer hochspannungsanlagen
DE3126744A1 (de) * 1981-07-02 1983-01-20 Siemens AG, 1000 Berlin und 8000 München Kontaktsystem fuer druckgas-leistungsschalter

Also Published As

Publication number Publication date
EP0136965A1 (fr) 1985-04-10
DE3462729D1 (en) 1987-04-23
US4539448A (en) 1985-09-03
DE3331819A1 (de) 1985-03-21
CA1230629A (fr) 1987-12-22
BR8404326A (pt) 1985-07-30
JPH027128B2 (fr) 1990-02-15
ZA846830B (en) 1985-04-24
JPS6072119A (ja) 1985-04-24
SU1269754A3 (ru) 1986-11-07

Similar Documents

Publication Publication Date Title
DE3311022C2 (fr)
DE69602200T2 (de) Hybrid-hochspannungsschalter
DE3611270C2 (de) Elektrische Schalteinrichtung für hohe Schaltspannungen
DE69110499T2 (de) Lastschalter unterstützt durch Varistor.
DE69115635T2 (de) SF6-Lastschalter mit eingebautem Kondensator
DE2460628C3 (de) Elektrisches Schaltgerät
DE69013300T2 (de) Überspannungsbegrenzender Schalter.
DE69109749T2 (de) Leistungsschalter mit eingebautem Varistor.
EP0136965B1 (fr) Sectionneur pour appareillage de commutation haute tension logé dans une enceinte métallique à gaz comprimé
EP1260823A1 (fr) Circuit d'essais synthétiques du pouvoir de coupure pour disjoncteurs à courant alternatif à haute tension
DE3242014C2 (fr)
DE3318873C2 (fr)
EP0793318A1 (fr) Dispositif dérivateur de surtensions
DE3319010C2 (fr)
DE69213082T2 (de) Gasisolierter Trennschalter und Schaltvorrichtung
EP2309526B1 (fr) Commutateur de puissance avec des branches de courant nominal parallèles
DE10016950A1 (de) Verfahren zum Abschalten eines Kurzschlussstroms im generatornahen Bereich
DE2508299A1 (de) Elektrisches schaltgeraet
DE68927533T2 (de) Trenner für gasisolierte Schaltanlage
DE3513908C2 (de) Freiluftschaltgerät für Hochspannungsschaltanlagen
EP0152718B1 (fr) Sectionneur pour appareillage de commutation haute tension, logé dans une enceinte métallique à gaz comprimé
DD241810A1 (de) Schalterpol fuer leistungsschalter
DE3143279C2 (de) Erdungsvorrichtung an einer isolierstoffgekapselten Mittelspannungs-Schaltanlage
DE4210545A1 (de) Trennschalter für eine metallgekapselte gasisolierte Hochspannungsanlage
EP0342321B1 (fr) Circuit pour le test synthétique d'interrupteurs de puisance à haute tension

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

Designated state(s): CH DE FR GB LI SE

17P Request for examination filed

Effective date: 19850627

17Q First examination report despatched

Effective date: 19860509

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB LI SE

REF Corresponds to:

Ref document number: 3462729

Country of ref document: DE

Date of ref document: 19870423

ET Fr: translation filed
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
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930714

Year of fee payment: 10

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

Ref country code: SE

Payment date: 19930813

Year of fee payment: 10

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

Ref country code: FR

Payment date: 19930819

Year of fee payment: 10

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

Ref country code: DE

Payment date: 19931020

Year of fee payment: 10

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

Ref country code: CH

Payment date: 19931116

Year of fee payment: 10

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

Ref country code: GB

Effective date: 19940815

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

Ref country code: SE

Effective date: 19940816

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

Ref country code: LI

Effective date: 19940831

Ref country code: CH

Effective date: 19940831

EAL Se: european patent in force in sweden

Ref document number: 84730086.0

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

Effective date: 19940815

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

Ref country code: FR

Effective date: 19950428

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

Effective date: 19950503

EUG Se: european patent has lapsed

Ref document number: 84730086.0

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST