EP0763249B1 - Power switch module - Google Patents

Power switch module Download PDF

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Publication number
EP0763249B1
EP0763249B1 EP95920741A EP95920741A EP0763249B1 EP 0763249 B1 EP0763249 B1 EP 0763249B1 EP 95920741 A EP95920741 A EP 95920741A EP 95920741 A EP95920741 A EP 95920741A EP 0763249 B1 EP0763249 B1 EP 0763249B1
Authority
EP
European Patent Office
Prior art keywords
gas
insulating carrier
carrier devices
pole
circuit breaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95920741A
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German (de)
French (fr)
Other versions
EP0763249A1 (en
Inventor
Christoph RÖHLING
Claudia Sigusch
Norbert Steinemer
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Siemens AG
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Siemens AG
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Publication date
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Publication of EP0763249A1 publication Critical patent/EP0763249A1/en
Application granted granted Critical
Publication of EP0763249B1 publication Critical patent/EP0763249B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H2033/6665—Details concerning the mounting or supporting of the individual vacuum bottles
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H2033/6667—Details concerning lever type driving rod arrangements
    • 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
    • H01H33/022—Details particular to three-phase circuit breakers

Definitions

  • the invention relates to a circuit breaker module for installation in gas-filled containers of gas-insulated switchgear, whereby each vacuum interrupter is a rectilinearly movable one Actuating rod is assigned by means of a bellows sealed into the gas-filled container.
  • a gas-insulated switchgear of the type defined at the outset is known from DE 42 11 154.
  • the as vacuum interrupters Circuit breakers implemented here are by means of two Carrier attached to an insulating plate, which in turn by holding elements designed as elbows with the front and the rear wall of the container is connected. Additionally serves another located below the vacuum interrupter Insulating plate, which is equally on the inner walls of the Container is attached as a further attachment of the vacuum interrupter inside the container.
  • the insulation panels are dimensioned so that the vacuum interrupters on the one hand assembly at the necessary points are accessible and that on the other hand, the insulating gas around the Vacuum interrupters can circulate sufficiently.
  • DE 34 36 173 discloses a circuit breaker in an insulating housing on the inside of the front wall to arrange a metal enclosure filled with insulating gas. However, the implementation is not a sealed one Bellows provided.
  • DE 42 10 716 discloses a multi-pole vacuum switch, the poles of each of shell-like insulating pieces are surrounded. This vacuum switch however, are not in gas-filled containers arranged.
  • the vacuum interrupters are largely independent of the geometrical shapes of the containers in which they are accommodated. Only the bulkhead plate, which is part of the gas-filled container, serves as an assembly basis for the insulator support devices.
  • the modular structure of the circuit breakers considerably facilitates the pre-assembly, which can therefore be carried out in considerably smaller volume units, so that the final assembly, which takes place locally and / or at different times, can be achieved much more cost-effectively.
  • the pole support and pole head device arranged between the two insulating support devices, the respective vacuum interrupter is practically securely stored in the container with fastening elements of a uniform design.
  • the respective screw bearings allow flexible and flexible assembly of the vacuum interrupters within the container at any time.
  • Insulating support devices With the trapezoidal profile structure on both sides Insulating support devices is a great stability of the Carrier and an exact storage of the vacuum tubes with the im Given bellows movable actuating rods, with the stop pieces half-enclosing the screw shafts by correcting the position of the vacuum interrupters There is dimensional tolerance compensation within the container.
  • FIG. 2 shows a top view of three circuit breaker modules, where in particular the mirror-symmetrical arrangement the insulating support devices 1, 1 'on the bulkhead 4 emerge. It can also be seen that the first and second screw bearings 5, 5 'and 6, 6' also face each other mirror-symmetrically, however, the first Screw bearings 5, 5 'to the second screw bearings 6, 6' in Longitudinal direction are inclined at a right angle. By this staggered arrangement of the screw bearings 5, 5 'and 6, 6' the vacuum interrupters 7 (FIG. 1) are between one another the insulating support devices 1, 1 'stored safely.

Abstract

The invention concerns a power switch module designed to be fitted in the gas-fiiled units of gas-insulated switchgear and having a vacuum switch tube (7) connected to an actuator rod which can be moved in a straight line and which leads through a gas-tight bellow into the gas-fiiled unit. The power switch module includes, mounted symmetrically opposite each other on a partition plate (4), two insulating supports (1, 1') between which the corresponding vacuum switch tube (7) is mounted by means of a pole support (2) and a pole head unit (3). Power switch modules of this kind are suitable for use in gas-insulated switchgear (8DC).

Description

Die Erfindung betrifft ein Leistungsschaltermodul zum Einbau in gasgefüllte Behälter von gasisolierten Schaltanlagen, wobei einer jeden Vakuumschaltröhre eine geradlinig bewegbare Betätigungsstange zugeordnet ist, die mittels eines Faltenbalges abgedichtet in den gasgefüllten Behälter führt.The invention relates to a circuit breaker module for installation in gas-filled containers of gas-insulated switchgear, whereby each vacuum interrupter is a rectilinearly movable one Actuating rod is assigned by means of a bellows sealed into the gas-filled container.

Eine gasisolierte Schaltanlage der eingangs definierten Art ist durch die DE 42 11 154 bekannt. Die als Vakuumschaltröhren realisierten Leistungsschalter sind hier mittels zweier Träger an einer Isolierplatte befestigt, die ihrerseits durch als Winkelstücke ausgestaltete Halteglieder mit der Front- und Rückwand des Behälters verbunden ist. Zusätzlich dient eine unterhalb der Vakuumschaltröhre angeordnete weitere Isolierplatte, die gleichermaßen an den Innenwänden des Behälter befestigt ist, als weitere Befestigung der Vakuumschaltröhre innerhalb des Behälters. Die Isolierplatten sind dabei so bemessen, daß die Vakuumschaltröhren einerseits bei der Montage an den dafür notwendigen Stellen zugänglich sind und daß andererseits im Betriebszustand das Isoliergas um die Vakuumschaltröhren ausreichend zirkulieren kann.A gas-insulated switchgear of the type defined at the outset is known from DE 42 11 154. The as vacuum interrupters Circuit breakers implemented here are by means of two Carrier attached to an insulating plate, which in turn by holding elements designed as elbows with the front and the rear wall of the container is connected. Additionally serves another located below the vacuum interrupter Insulating plate, which is equally on the inner walls of the Container is attached as a further attachment of the vacuum interrupter inside the container. The insulation panels are dimensioned so that the vacuum interrupters on the one hand assembly at the necessary points are accessible and that on the other hand, the insulating gas around the Vacuum interrupters can circulate sufficiently.

Aus der DE 34 36 173 ist bekannt, einen Leistungsschalter in einem Isolierstoffgehäuse an der Innenseite der Frontwand einer mit Isoliergas gefüllten Metallkapselung anzuordnen. Allerdings ist hier als Durchführung kein abgedichteter Faltenbalg vorgesehen. Die DE 42 10 716 offenbart dagegen einen mehrpoligen Vakuumschalter, deren Pole jeweils von schalenartigen Isolierstücken umgeben sind. Diese Vakuumschalter sind jedoch nicht in gasgefüllten Behältern angeordnet.DE 34 36 173 discloses a circuit breaker in an insulating housing on the inside of the front wall to arrange a metal enclosure filled with insulating gas. However, the implementation is not a sealed one Bellows provided. DE 42 10 716, however, discloses a multi-pole vacuum switch, the poles of each of shell-like insulating pieces are surrounded. This vacuum switch however, are not in gas-filled containers arranged.

Die der Erfindung zugrundeliegende Aufgabe besteht darin, die Befestigung und Montage der Vakuumschaltröhren innerhalb der Behälter erheblich zu vereinfachen ohne jedoch die technisch bedingten Werte der Isolierungen der Vakuumschaltröhren untereinander und zu den sie umgebenden Teilen einschränkend zu verändern. Erfindungsgemäß wird dies durch die Merkmale

  • 1.1. das Leistungsschaltermodul enthält zwei der Aufnahme und Abschirmung einer Vakuumschaltröhre dienende Isolierträgereinrichtungen mit gleichartiger Profilstruktur,
  • 1.2. die Isolierträgereinrichtungen sind spiegelsymmetrisch auf einer einen Teil des gasgefüllten Behälters bilden
    den Schottplatte angeordnet und lösbar mit dieser verbindbar,
  • 1.3. die Isolierträgereinrichtungen weisen an den freien Enden jeweils zwei längsmittensymmetrisch angeordnete erste Schraubenlager zur Befestigung einer die Vakuumschaltröhre im außenliegenden Endbereich radial lagernden Polkopfeinrichtung auf,
  • 1.4. die Isolierträgereinrichtungen weisen im einander zugewandten Innenbereich längsmittig jeweils zwei nebeneinander angeordnete zweite Schraubenlager zur Befestigung einer die Vakuumschaltröhre im innenliegenden Endbereich lagernden Polträgereinrichtung auf, erreicht.
    • The object on which the invention is based is to considerably simplify the fastening and assembly of the vacuum interrupters within the containers without, however, changing the technical values of the insulation of the vacuum interrupters with respect to one another and to the parts surrounding them. According to the invention, this is due to the features
  • 1.1. the circuit breaker module contains two insulating support devices with the same profile structure that serve to receive and shield a vacuum interrupter,
  • 1.2. the insulating support devices are mirror-symmetrical and form part of the gas-filled container
    the bulkhead plate arranged and releasably connectable to it,
  • 1.3. the insulating support devices each have at the free ends two longitudinally symmetrically arranged first screw bearings for fastening a pole head device which radially supports the vacuum interrupter in the outer end region,
  • 1.4. in the mutually facing inner region, the insulating support devices each have two second screw bearings arranged next to one another for fastening a pole support device supporting the vacuum interrupter in the inner end region.

    • Mit den derartig strukturierten Isolierträgereinrichtungen sind die Vakuumschaltröhren von den geometrischen Formgebungen der Behälter, in denen sie untergebracht sind, weitestgehend unabhängig. Lediglich die Schottplatte, die ein Teil des gasgefüllten Behälters darstellt, dient als Montagegrundlage für die Isolerträgereinrichtungen. Die modulare Struktur der Leistungsschalter erleichtert in erheblicher Weise die Vormontage, die somit in erheblich kleineren Volumeneinheiten vorgenommen werden kann, so daß die örtlich und/oder zeitlich getrennt erfolgende Endmontage wesentlich kostengünstiger erreichbar ist.
    Mit der zwischen den beiden Isolierträgereinrichtungen angeordneten Polträger- und Polkopfeinrichtung ist die jeweilige Vakuumschaltröhre praktisch mit Befestigungselementen einheitlicher Bauart sicher in dem Behälter gelagert. Die jeweiligen Schraubenlager gestatten eine jederzeit lösbare und flexiblere Montage der Vakuumschaltröhren innerhalb des Behälters.    With the insulating support devices structured in this way, the vacuum interrupters are largely independent of the geometrical shapes of the containers in which they are accommodated. Only the bulkhead plate, which is part of the gas-filled container, serves as an assembly basis for the insulator support devices. The modular structure of the circuit breakers considerably facilitates the pre-assembly, which can therefore be carried out in considerably smaller volume units, so that the final assembly, which takes place locally and / or at different times, can be achieved much more cost-effectively.
    With the pole support and pole head device arranged between the two insulating support devices, the respective vacuum interrupter is practically securely stored in the container with fastening elements of a uniform design. The respective screw bearings allow flexible and flexible assembly of the vacuum interrupters within the container at any time.

    Eine vorteilhafte Ausgestaltung der Erfindung sieht die Merkmale

  • 2.1. die Isolierträgereinrichtungen weisen jeweils im der Schottplatte zugewandten Endbereich eine trapezförmige Pofilstruktur auf,
  • 2.2. die ersten und die zweiten Schraubenlager der Isolierträgereinrichtungen sind durch die Schraubenschafte halbumschließende Anschlagstücke realisiert, vor.
    • An advantageous embodiment of the invention sees the features
  • 2.1. the insulating support devices each have a trapezoidal profile structure in the end region facing the partition plate,
  • 2.2. the first and the second screw bearings of the insulating support devices are realized by the screw shafts semi-enclosing stop pieces before.

    • Mit der auf beiden Seiten trapezförmigen Profilstruktur der Isolierträgereinrichtungen ist eine große Stabilität der Träger und eine exakte Lagerungen der Vakuumröhren mit den im Faltenbalg bewegbaren Betätigungsstangen gegeben, wobei mit den die Schraubenschafte halbumschließenden Anschlagstücken durch entsprechende Lagekorrektur der Vakuumschaltröhren innerhalb der Behälter ein Maßtoleranzausgleich gegeben ist.With the trapezoidal profile structure on both sides Insulating support devices is a great stability of the Carrier and an exact storage of the vacuum tubes with the im Given bellows movable actuating rods, with the stop pieces half-enclosing the screw shafts by correcting the position of the vacuum interrupters There is dimensional tolerance compensation within the container.

    Eine weitere vorteilhafte Ausgestaltung der Erfindung sehen die Merkmale

  • 3.1. die Isolierträgereinrichtungen sind durch einen glasfaserverstärkten Polyesterformstoff realisiert,
  • 3.2. die Polträgereinrichtung und die Polkopfeinrichtung sind durch eine Aluminiumguß-Legierung realisiert, vor.
    • The features see a further advantageous embodiment of the invention
  • 3.1. the insulating support devices are realized with a glass fiber reinforced polyester molding material,
  • 3.2. the pole carrier device and the pole head device are realized by a cast aluminum alloy.

    • Mit einer derartigen Werkstoffauswahl sind die erforderlichen mechanischen und elektrischen Eigenschaften zur Lagerung der Vakuumschaltröhren in den gasisolierten Behältern ohne Schwierigkeiten zu erfüllen.With such a choice of materials, the required ones mechanical and electrical properties for storing the Vacuum interrupters in the gas-insulated containers without Difficulties to meet.

    Die Erfindung wird durch ein in zwei Figuren dargestelltes Ausführungsbeispiel näher erläutert, wobei die

    Figur 1
    die Frontansicht des Leistungsschaltermoduls zeigt und die
    Figur 2
    drei nebeneinander angeordnete Vakuumschaltröhren in ihrer üblichen Einbauweise erkennen läßt.
    The invention is illustrated by an embodiment shown in two figures, the
    Figure 1
    shows the front view of the circuit breaker module and the
    Figure 2
    shows three adjacent vacuum interrupters in their usual installation.

    In der Figur 1 ist lediglich ein Teil des Behälters als Schottplatte 4 dargestellt. An der Schottplatte 4 sind durch nicht bezeichnete Schraubverbindungen zwei spiegelbildlich montierte Isolierträgereinrichtungen 1, 1' (Figur 2) angeschraubt. Zwischen den Isolierträgereinrichtungen 1, 1' ist die Polträgereinrichtung 2 und die Polkopfeinrichtung 3 so angeordnet, daß die Vakuumschaltröhre 7 durch die Polkopfeinrichtung 3 im außenliegenden Endbereich radial gelagert ist, während die Vakuumschaltröhre 7 mit der Polträgereinrichtung 2 im innenliegenden Endbereich stützgelagert ist. Weiterhin ist erkennbar, daß das Stromband 8 durch nicht näher bezeichnete Befestigungsteile mit der Polträgereinrichtung 2 verbunden ist, wobei mit dem Stromband 8 nicht dargestellte Stromschienen elektrisch leitend verbunden sind. Des weiteren ist an der Polkopfeinrichtung 3 die Anschlußeinrichtung 9 vorgesehen, an die die ebenfalls nicht dargestellte Stromschiene elektrisch leitend angeschlossen ist.In Figure 1, only part of the container is as Schottplatte 4 shown. On the bulkhead plate 4 are through unspecified screw connections two mirror images mounted insulating support devices 1, 1 '(Figure 2) screwed. Is between the insulating support devices 1, 1 ' the pole carrier device 2 and the pole head device 3 so arranged that the vacuum interrupter 7 through the pole head device 3 is mounted radially in the outer end area, while the vacuum interrupter 7 with the pole support device 2 is supported in the inner end area. Farther it can be seen that the current band 8 by unspecified Fastening parts connected to the pole support device 2 is, with the current band 8 busbars, not shown are electrically connected. Furthermore is the connection device 9 is provided on the pole head device 3, to which the busbar, also not shown is electrically connected.

    Die Figur 2 zeigt in der Draufsicht drei Leistungsschaltermodule, bei denen insbesondere die spiegelsymmetrische Anordnung der Isolierträgereinrichtungen 1, 1' auf der Schottplatte 4 hervorgehen. Weiterhin ist erkennbar, daß sich die ersten und zweiten Schraubenlager 5, 5' und 6, 6' ebenfalls spiegelsymmetrisch gegenüberstehen, wobei jedoch die ersten Schraubenlager 5, 5' zu den zweiten Schraubenlagern 6, 6' in Längsrichtung um einen rechten Winkel geneigt sind. Durch diese versetzte Anordnung der Schraubenlager 5, 5' und 6, 6' zueinander sind die Vakuumschaltröhren 7 (Figur 1) zwischen den Isolierträgereinrichtungen 1, 1' sicher gelagert. Zur Vervollständigung der Leistungsschaltermodule ist der Antrieb 10 nur angedeutet, mit deren Hilfe die nichtbezeichneten gradlinig bewegbaren Betätigungsstangen innerhalb des ebenfalls nicht bezeichneten gasgefüllten Behälters bewegt werden können. Die Betätigungsstangen sind bekanntermaßen durch die Faltenbalge zu ihrer Behälterumgebung abgedichtet. Über die Anschlußeinrichtung 9 sind die stromeinspeisenden Stromschienen elektrisch leitend mit der jeweiligen Vakuumschaltröhre verbunden, während über das Stromband 8 (Figur 1) der Strom über die nicht dargestellten Stromschienen zur ebenfalls nicht dargestellten Lasttrennschaltereinrichtung gelangt, um von dort aus bekannterweise den Stromkabelabgängen zugeführt werden zu können.FIG. 2 shows a top view of three circuit breaker modules, where in particular the mirror-symmetrical arrangement the insulating support devices 1, 1 'on the bulkhead 4 emerge. It can also be seen that the first and second screw bearings 5, 5 'and 6, 6' also face each other mirror-symmetrically, however, the first Screw bearings 5, 5 'to the second screw bearings 6, 6' in Longitudinal direction are inclined at a right angle. By this staggered arrangement of the screw bearings 5, 5 'and 6, 6' the vacuum interrupters 7 (FIG. 1) are between one another the insulating support devices 1, 1 'stored safely. For Completion of the circuit breaker modules is the drive 10 only hinted with the help of the unidentified straight actuating rods within the likewise not designated gas-filled container are moved can. The operating rods are known for Bellows sealed to their container environment. About the Connection device 9 are the current-feeding busbars electrically conductive with the respective vacuum interrupter connected, while the current over the current band 8 (Figure 1) via the busbars, not shown, also for Switch disconnector device, not shown, arrives to from there known to be fed to the power cable outlets to be able to.

    Claims (3)

    1. Circuit breaker module for installation in gas-filled containers of gas-insulated switching systems, whereby an actuating rod which can be moved in a straight line is allocated to a vacuum interrupter, which actuating rod leads in a sealed manner into the gas-filled container by means of bellows,
      characterized by the following features:
      the circuit breaker module contains two insulating carrier devices (1, 1') with a profile structure of the same kind, the devices being used to receive and shield a vacuum interrupter,
      the insulating carrier devices (1, 1') are arranged mirror-symmetrically on a partition plate (4) forming a part of the gas-filled container and can be connected in a releasable manner to the partition plate,
      the insulating carrier devices (1, 1') have at the free ends in each case two first screw bearings (5, 5'), arranged symmetrically in terms of the longitudinal centre, for fastening a pole end device (3), which radially supports the vacuum interrupter (7) in the outer end region,
      in the inner regions which face each other the insulating carrier devices (1, 1') have in the longitudinal centre in each case two second screw bearings (6, 6') arranged next to each other, for fastening a pole carrier device (2) which supports the vacuum interrupter (7) in the inner end region.
    2. Circuit breaker module according to claim 1,
      characterized by the following features:
      the insulating carrier devices (1, 1') in each case have a trapezoidal profile structure in the end region facing the partition plate (4),
      the first and the second screw bearings (5, 5') and (6, 6') of the insulating carrier devices (1, 1') are realized by stop parts which half-enclose the screw shafts.
    3. Circuit breaker module according to claim 1,
      characterized by the following features:
      the insulating carrier devices (1, 1') are realized by a fibreglass-reinforced polyester moulding material,
      the pole carrier device (2) and the pole end device (3) are realized by a cast aluminium alloy.
    EP95920741A 1994-05-30 1995-05-29 Power switch module Expired - Lifetime EP0763249B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE4419380 1994-05-30
    DE4419380A DE4419380C1 (en) 1994-05-30 1994-05-30 Circuit breaker module
    PCT/DE1995/000710 WO1995033273A1 (en) 1994-05-30 1995-05-29 Power switch module

    Publications (2)

    Publication Number Publication Date
    EP0763249A1 EP0763249A1 (en) 1997-03-19
    EP0763249B1 true EP0763249B1 (en) 1998-04-08

    Family

    ID=6519678

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95920741A Expired - Lifetime EP0763249B1 (en) 1994-05-30 1995-05-29 Power switch module

    Country Status (9)

    Country Link
    US (1) US5864108A (en)
    EP (1) EP0763249B1 (en)
    JP (1) JP3046074B2 (en)
    KR (1) KR100342343B1 (en)
    CN (1) CN1148903A (en)
    DE (2) DE4419380C1 (en)
    ES (1) ES2116087T3 (en)
    RU (1) RU2117352C1 (en)
    WO (1) WO1995033273A1 (en)

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    CN1148903A (en) 1997-04-30
    KR100342343B1 (en) 2002-11-07
    WO1995033273A1 (en) 1995-12-07
    KR970703606A (en) 1997-07-03
    US5864108A (en) 1999-01-26
    RU2117352C1 (en) 1998-08-10
    JP3046074B2 (en) 2000-05-29
    DE59501856D1 (en) 1998-05-14
    JPH09506737A (en) 1997-06-30
    ES2116087T3 (en) 1998-07-01
    DE4419380C1 (en) 1995-10-19
    EP0763249A1 (en) 1997-03-19

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