EP0719363B1 - Transformer station - Google Patents

Transformer station Download PDF

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Publication number
EP0719363B1
EP0719363B1 EP94926944A EP94926944A EP0719363B1 EP 0719363 B1 EP0719363 B1 EP 0719363B1 EP 94926944 A EP94926944 A EP 94926944A EP 94926944 A EP94926944 A EP 94926944A EP 0719363 B1 EP0719363 B1 EP 0719363B1
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EP
European Patent Office
Prior art keywords
transformer station
station according
closing
closure member
magnet
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
EP94926944A
Other languages
German (de)
French (fr)
Other versions
EP0719363A1 (en
Inventor
Hermann-Josef Malm
Ulrich Bachon
Hans Georg Loseries
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.)
Aqseptence Group GmbH
Original Assignee
Passavant Werke AG and Co KG
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 Passavant Werke AG and Co KG filed Critical Passavant Werke AG and Co KG
Publication of EP0719363A1 publication Critical patent/EP0719363A1/en
Application granted granted Critical
Publication of EP0719363B1 publication Critical patent/EP0719363B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
    • E03F5/16—Devices for separating oil, water or grease from sewage in drains leading to the main sewer
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
    • E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
    • E04H5/04—Transformer houses; Substations or switchgear houses

Definitions

  • the invention relates to transformers of any type installed outdoors. It is a requirement to place transformers installed outdoors, which are cooled and insulated with a special oil (transformer oil), with their foundations in a drip pan, the usable volume of which must correspond to the amount of transformer oil. In the event of a malfunction, the entire coolant can be collected in the basin.
  • transformer oil transformer oil
  • the catch basin Since the catch basin is under the open sky, it must be drained into the sewage system. The drainage must be carried out via a separator so that the drip losses of the transformer washed away with the rainwater are retained.
  • the separator which can also be equipped with a coalescence insert, is fitted with a conventional float lock, which closes the pure water drain if the separator's storage capacity is exceeded.
  • a sensor located in the area of the separated light material layer gives an alarm when the separator has to be disposed of.
  • the catch basin also serves to retain extinguishing agents that are used in the event of a fire on the transformer. So that the extinguishing agent does not get into the separator, where it would be very difficult to dispose, it has already been proposed, as in DE-U-86 00 827, at the outlet of the collecting basin provide a quick-closing slide that can be closed by hand in the event of a fire.
  • the sensing probe present in the separator is connected to the closing drive of the quick-closing slide in such a way that the inlet to the separator is closed when the sensing probe responds.
  • the closing drive of the quick-closing slide is preferably designed as a magnet for this purpose, so that it drops the slide into the closed position by demagnetization. If it is designed as an electromagnet, it is also ensured that the quick-closing slide closes immediately in the event of a power failure, which may be caused by a fire in the transformer.
  • Another possibility for closing the quick-closing slide is to adjust the slide plate in the closed position by means of a tension spring which is secured by an electromagnetically held catch. In the event of a power failure, the detent disengages automatically and the tension spring brings the slide plate into the closed position.
  • the quick-closing slide can also be used to regulate the inlet to the separator, specifically by providing the frame of the slide plate with a perforated diaphragm, which acts as a throttle. In heavy rain, the water stored in the catch basin is fed into the separator in a metered flow. It also makes sense to provide the quick-closing slide with a manual release that can be actuated faster in the event of a fire than the automatic one.
  • the figure shows a system designed according to the invention for dewatering the collecting basin 1 of transformer foundations 2.
  • the collecting basin 1 has in front of the outlet opening 3 a flanged quick-closing slide 4 and in front of it a small sump 5 for better assembly of the slide.
  • the drain line 6 opens into an oil separator in accordance with DIN 1999, parts 4 to 6, that is, a coalescence separator 7 with integrated sludge trap 8.
  • a float closure 10 is arranged upstream of the pure water drain 9, the float of which is tared to the density of the cooling oil.
  • a sensing probe 11 is installed, which is connected to the alarm and monitoring device 12 according to the circuit.
  • Another switching connection 13 goes from the device to the closing drive of the quick-action slide 4.
  • a sampling shaft 14 is connected downstream of the coalescence separator.
  • the closure member 4 In normal operation, the closure member 4 is held in the open position by its closing device (not shown), for example by holding a quick-closing slide in the raised position by a magnet. In this position, rainwater can flow from the catch basin 1 via the outlet 4 and the line 6 into the oil separator 7, where entrained oil contaminants are separated and form a floating oil layer.
  • the float closure 10 which is adjusted to the weight difference between oil and water, closes the drain line 9 of the separator 7.
  • the liquid level in the separator 7 rises as a result, which is detected by a sensor probe 11, which is triggered by an alarm. and monitoring device 11 is connected. This indicates that the separator must be disposed of.
  • the closing device (not shown) of the closure member 4 is triggered via the monitoring device 12 and the line 13 and the closure member 4 is closed, so that excessive amounts of oil cannot get into the separator 7. This is done, for example, by switching off a magnetic force that holds a slide serving as a closure member in the open position, so that the slide is no longer held and falls into its closed position due to gravity.
  • the closing of the slide can be effected by a tension spring which is locked in the open position of the slide by an electromagnetically releasable catch.
  • the power supply required to keep the closure member open and / or close can be connected to the power supply and additionally to a battery.
  • An AC / DC converter inserted into the power supply means that e.g. short AC failures caused by lightning are switched to battery operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Power Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Discharge Heating (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

A transformer station has a collecting basin (1) surrounding the foundation (2) of the transformer and has an oil separator connected to the outlet (3) of said basin. An occlusion element (4) in the outlet of the collecting basin (1) is automatically closed by a sensor in the oil separator (7) when the layer of separated oil reaches a predetermined level. This ensures that the separator (7) does not receive an inordinate inflow of the transformer oil that runs into the collecting basin (1) in the event of a failure or along with the water used to extinguish a fire.

Description

Die Erfindung bezieht sich auf im Freien aufgestellte Transformatoren beliebiger Bauart. Es ist Vorschrift, im Freien aufgestellte Transformatoren, die mit einem Spezialöl (Transformatorenöl) gekühlt und isoliert werden, mit ihren Fundamenten in eine Auffangwanne zu setzen, deren nutzbares Volumen der Menge des Transformatorenöls entsprechen muß. Im Störfall kann in den Becken die ganze Kühlflüssigkeit aufgefangen werden.The invention relates to transformers of any type installed outdoors. It is a requirement to place transformers installed outdoors, which are cooled and insulated with a special oil (transformer oil), with their foundations in a drip pan, the usable volume of which must correspond to the amount of transformer oil. In the event of a malfunction, the entire coolant can be collected in the basin.

Da das Auffangbecken unter freiem Himmel steht, muß es in die Kanalisation entwässert werden. Die Entwässerung muß über einen Abscheider geführt werden, damit die mit dem Regenwasser fortgeschwemmten Tropfverluste des Transformators zurückgehalten werden. Der Abscheider, der zusätzlich mit einem Koaleszenzeinsatz ausgerüstet sein kann, erhält einen üblichen Schwimmerverschluß, der den Reinwaserablauf verschließt, wenn die Speicherfähigkeit des Abscheiders überschritten ist. Eine im Bereich der abgetrennten Leichtstoffschicht angeordnete Fühlsonde gibt Alarm, wenn der Abscheider entsorgt werden muß.Since the catch basin is under the open sky, it must be drained into the sewage system. The drainage must be carried out via a separator so that the drip losses of the transformer washed away with the rainwater are retained. The separator, which can also be equipped with a coalescence insert, is fitted with a conventional float lock, which closes the pure water drain if the separator's storage capacity is exceeded. A sensor located in the area of the separated light material layer gives an alarm when the separator has to be disposed of.

Im Störfall, d.h. bei Austreten einer größeren Menge Kühlöl, wird dieses vom Auffangbecken in den Abscheider geleitet und dort durch Aufschwimmen zurückgehalten. Die Fühlsonde gibt ordnungsgemäß Alarm und weist dadurch auf den Störfall hin. Das Kühlöl ist nach Behebung des Störfalls aus dem Abscheider zu entsorgen.In the event of a fault, i.e. if a large amount of cooling oil escapes, it is led from the catch basin into the separator and retained there by floating. The sensor probe issues an alarm and indicates the malfunction. The cooling oil must be disposed of from the separator after the malfunction has been remedied.

Das Auffangbecken dient auch noch zum Zurückhalten von Löschmitteln, das im Falle eines Brandes am Transformator eingesetzt wird. Damit das Löschmittel nicht in den Abscheider gelangt, wo es sehr schwer zu entsorgen wäre, ist bereits vorgeschlagen worden wie beim DE-U-86 00 827, am Auslauf des Auffangbeckens einen Schnellschlußschieber vorzusehen, der im Brandfall von Hand geschlossen werden kann.The catch basin also serves to retain extinguishing agents that are used in the event of a fire on the transformer. So that the extinguishing agent does not get into the separator, where it would be very difficult to dispose, it has already been proposed, as in DE-U-86 00 827, at the outlet of the collecting basin provide a quick-closing slide that can be closed by hand in the event of a fire.

Es ist wünschenswert, zu verhindern, daß Kühlöl in größerer Menge in den Abscheider gelangt. Diese Aufgabe wird nunmehr erfindungsgemäß dadurch gelöst, daß die im Abscheider vorhandene Fühlsonde derart auf den Schließantrieb des Schnellschlußschiebers geschaltet ist, daß der Zulauf zum Abscheider bei Ansprechen der Fühlsonde geschlossen wird. Der Schließantrieb des Schnellschlußschiebers ist dafür vorzugsweise als Magnet ausgebildet, so daß er durch Entmagnetisierung den Schieber in Schließstellung fallen läßt. Wenn er als Elektromagnet ausgebildet ist, ist ferner sichergestellt, daß der Schnellschlußschieber bei Stromausfall, der durch einen Brand im Transformator verursacht sein kann, sofort schließt.It is desirable to prevent large amounts of cooling oil from entering the separator. This object is now achieved according to the invention in that the sensing probe present in the separator is connected to the closing drive of the quick-closing slide in such a way that the inlet to the separator is closed when the sensing probe responds. The closing drive of the quick-closing slide is preferably designed as a magnet for this purpose, so that it drops the slide into the closed position by demagnetization. If it is designed as an electromagnet, it is also ensured that the quick-closing slide closes immediately in the event of a power failure, which may be caused by a fire in the transformer.

Eine andere Möglichkeit zum Schließen des Schnellschlußschiebers ist, die Schieberplatte durch eine Zugfeder in Schließstellung zu verstellen, die durch eine elektromagnetisch eingerückt gehaltene Raste gesichert ist. Bei Stromausfall rückt die Raste selbsttätig aus, und die Zugfeder holt die Schieberplatte in die Schließstellung.Another possibility for closing the quick-closing slide is to adjust the slide plate in the closed position by means of a tension spring which is secured by an electromagnetically held catch. In the event of a power failure, the detent disengages automatically and the tension spring brings the slide plate into the closed position.

Der Schnellschlußschieber kann des weiteren zur Regulierung des Zulaufs zum Abscheider herangezogen werden, und zwar indem der Rahmen der Schieberplatte eine Lochblende erhält, die als Drossel wirkt. Bei Starkregen wird das im Auffangbecken gespeicherte Wasser in dosiertem Strom in den Abscheider geleitet. Es ist ferner sinnvoll, den Schnellschlußschieber zusätzlich mit einer Handauslösung zu versehen, die im Brandfall schneller betätigt werden kann als die selbsttätige.The quick-closing slide can also be used to regulate the inlet to the separator, specifically by providing the frame of the slide plate with a perforated diaphragm, which acts as a throttle. In heavy rain, the water stored in the catch basin is fed into the separator in a metered flow. It also makes sense to provide the quick-closing slide with a manual release that can be actuated faster in the event of a fire than the automatic one.

Die Abbildung zeigt eine erfindungsgemäß ausgeführte Anlage zur Entwässerung des Auffangbeckens 1 von Transformatorenfundamenten 2. Das Auffangbecken 1 besitzt vor der Auslauföffnung 3 einen angeflanschten Schnellschlußschieber 4 und davor einen kleinen Sumpf 5 zur besseren Montage des Schiebers. Die Ablaufleitung 6 mündet in einen Ölabscheider nach DIN 1999 Teil 4 bis 6, also einen Koaleszenzabscheider 7 mit integriertem Schlammfang 8. Dem Reinwasser-Ablauf 9 ist ein Schwimmer-Verschluß 10 vorgeordnet, dessen Schwimmer auf die Dichte des Kühlöls tariert ist. Neben dem Einlauf in den Koaleszenz-Abscheider ist eine Fühlsonde 11 installiert, die schaltungsgemäß mit dem Alarm- und Überwachungsgerät 12 verbunden ist. Eine weitere Schaltverbindung 13 geht vom Gerät zum Schließantrieb des Schnellschußschiebers 4.The figure shows a system designed according to the invention for dewatering the collecting basin 1 of transformer foundations 2. The collecting basin 1 has in front of the outlet opening 3 a flanged quick-closing slide 4 and in front of it a small sump 5 for better assembly of the slide. The drain line 6 opens into an oil separator in accordance with DIN 1999, parts 4 to 6, that is, a coalescence separator 7 with integrated sludge trap 8. A float closure 10 is arranged upstream of the pure water drain 9, the float of which is tared to the density of the cooling oil. In addition to the inlet into the coalescence separator, a sensing probe 11 is installed, which is connected to the alarm and monitoring device 12 according to the circuit. Another switching connection 13 goes from the device to the closing drive of the quick-action slide 4.

Dem Koaleszenz-Abscheider ist ablaufseitig ein Probenahme-Schacht 14 nachgeschaltet.A sampling shaft 14 is connected downstream of the coalescence separator.

Die beschriebene Ausführungsform der Erfindung arbeitet wie folgt:The described embodiment of the invention works as follows:

Im Normalbetrieb wird das Verschlußorgan 4 durch seine (nicht dargestellte) Schließvorrichtung in der Offenstellung gehalten, z.B. indem ein Schnellschlußschieber durch einen Magneten in der hochgezogenen Stellung festgehalten wird. In dieser Stellung kann Regenwasser aus dem Auffangbecken 1 über den Ablauf 4 und die Leitung 6 in den Ölabscheider 7 fließen, wo mitgeführte Ölverunreinigungen abgeschieden werden und eine schwimmende Ölschicht bilden. Wenn die Ölschicht eine vorgegebene Dicke erreicht hat, schließt der auf den Gewichtsunterschied zwischen Öl und Wasser eingestellte Schwimmerverschluß 10 die Ablaufleitung 9 des Abscheiders 7. Das Flüssigkeitsniveau im Abscheider 7 steigt dadurch an, was durch eine Fühlsonde 11 detektiert wird, die mit einem Alarm- und Überwachungsgerät 11 verbunden ist. Dieses zeigt an, daß der Abscheider entsorgt werden muß.In normal operation, the closure member 4 is held in the open position by its closing device (not shown), for example by holding a quick-closing slide in the raised position by a magnet. In this position, rainwater can flow from the catch basin 1 via the outlet 4 and the line 6 into the oil separator 7, where entrained oil contaminants are separated and form a floating oil layer. When the oil layer has reached a predetermined thickness, the float closure 10, which is adjusted to the weight difference between oil and water, closes the drain line 9 of the separator 7. The liquid level in the separator 7 rises as a result, which is detected by a sensor probe 11, which is triggered by an alarm. and monitoring device 11 is connected. This indicates that the separator must be disposed of.

Wenn sich durch einen Schadensfall am Transformator, daß Auffangbecken 1 mit Öl füllt, steigt das Niveau der abgeschiedenen Ölschicht im Füllabscheider ebenfalls an. Wenn die Sonde 11 den Anstieg auf ein vorgegebenes Niveau feststellt, wird über das Überwachungsgerät 12 und die Leitung 13 die (nicht dargestellte) Schließvorrichtung des Verschlußorgans 4 ausgelöst und das Verschlußorgan 4 geschlossen, so daß keine übermäßig großen Ölmengen in den Abscheider 7 gelangen können. Dies geschieht beispielsweise durch Abschalten einer Magnetkraft, die einen als Verschlußorgan dienenden Schieber in der Offenstellung hält, so daß der Schieber nicht mehr gehalten ist und durch die Schwerkraft in seine Verschlußstellung fällt. Alternativ kann das Schließen des Schiebers durch eine Zugfeder berwirkt werden, die in der Offenstellung des Schiebers durch eine elektromagnetisch lösbare Raste arretiert ist.If, due to a damage to the transformer, the catch basin 1 fills with oil, the level of the separated oil layer in the filling separator also rises. When the probe 11 detects the rise to a predetermined level, the closing device (not shown) of the closure member 4 is triggered via the monitoring device 12 and the line 13 and the closure member 4 is closed, so that excessive amounts of oil cannot get into the separator 7. This is done, for example, by switching off a magnetic force that holds a slide serving as a closure member in the open position, so that the slide is no longer held and falls into its closed position due to gravity. Alternatively, the closing of the slide can be effected by a tension spring which is locked in the open position of the slide by an electromagnetically releasable catch.

Die zum Offenhalten und/oder Schließen des Verschlußorgans erforderliche Stromversorgung kann an das Stromnetz und zusätzlich an eine Batterie angeschlossen sein. Ein in die Stromzufuhr eingefügter AC/DC-Wandler bewirkt, daß bei z.B. durch Blitzschlag verursachten kurzen Wechselstromausfällen auf Batteriebetrieb umgeschaltet wird.The power supply required to keep the closure member open and / or close can be connected to the power supply and additionally to a battery. An AC / DC converter inserted into the power supply means that e.g. short AC failures caused by lightning are switched to battery operation.

Claims (10)

  1. A transformer station with a collecting basin (1) surrounding a foundation (2) for a transformer and an oil separator (7) which is connected to the outlet (3) of the collecting basin and has a sensor (11) for the level of the separated oil layer, and a closure member (4) which is provided at the outlet (3) of the collecting basin and which is open during normal operation, characterised in that the closure member (4) has an automatically actuatable closing means which is controlled by the sensor (11) in such a way that when a preset level of the separated oil layer is reached in the oil separator (7) the closing of the closure member (4) is actuated.
  2. A transformer station according to Claim 1, characterised in that the closure member (4) is in the form of a rapid-closing slide valve.
  3. A transformer station according to Claim 1, characterised in that a flow-restricting member is associated with the outlet (3), which restricts the outflow from the collecting basin to the hydraulic rated throughflow (rated capacity) for which the oil separator (7) is designed.
  4. A transformer station according to Claim 2 or 3, characterised in that the flow-restricting member is a perforated shutter which is disposed in the frame plate of the rapid-closing slide valve.
  5. A transformer station according to Claim 2, characterised in that the closing means has a magnet for keeping the rapid-closing slide valve open and a device for releasing the retaining force exerted by the magnet.
  6. A transformer station according to Claim 5, characterised in that the magnet is an electromagnet.
  7. A transformer station according to Claim 5, characterised in that the magnet is a permanent holding magnet and the device for releasing the retaining force creates an electromagnetic opposing field.
  8. A transformer station according to Claim 2, characterised in that the closing means has a tension spring which is arrested in the open position of the slide valve by a detent held engaged electromagnetically, and which draws the rapid-closing slide valve into the closed position when the detent is released.
  9. A transformer station according to Claim 5 or 8, characterised in that the electromagnet has a power supply from the mains, which can be automatically switched over to a connected battery in the event of failure of the mains supply.
  10. A transformer station according to any one of Claims 1 to 9, characterised in that the closing means of the closure member (4) can additionally be manually actuated.
EP94926944A 1993-09-15 1994-09-15 Transformer station Expired - Lifetime EP0719363B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9313924U 1993-09-15
DE9313924U DE9313924U1 (en) 1993-09-15 1993-09-15 Transformer station
PCT/EP1994/003100 WO1995008031A1 (en) 1993-09-15 1994-09-15 Transformer station

Publications (2)

Publication Number Publication Date
EP0719363A1 EP0719363A1 (en) 1996-07-03
EP0719363B1 true EP0719363B1 (en) 1997-03-05

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Application Number Title Priority Date Filing Date
EP94926944A Expired - Lifetime EP0719363B1 (en) 1993-09-15 1994-09-15 Transformer station

Country Status (6)

Country Link
EP (1) EP0719363B1 (en)
AT (1) ATE149605T1 (en)
DE (2) DE9313924U1 (en)
ES (1) ES2098978T3 (en)
GR (1) GR3022905T3 (en)
WO (1) WO1995008031A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29908811U1 (en) * 1999-05-19 1999-07-29 Rubba, Uwe, 34355 Staufenberg Device for collecting light liquids and suitable separators for their retention
ES2306631B1 (en) * 2005-12-05 2009-09-16 Knock Telecom, S.A. UNDERGROUND CONTAINER FOR TELECOMMUNICATIONS EQUIPMENT.
WO2007065958A1 (en) * 2005-12-05 2007-06-14 Knock Telecom, S.A. Underground container for telecommunication devices
DE102016106500B3 (en) * 2016-04-08 2017-05-24 Gerhard Sell Device for collecting light liquid leaking from a technical equipment or a device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8600827U1 (en) * 1986-01-15 1986-03-27 Passavant-Werke AG & Co KG, 6209 Aarbergen Collecting container
DE8811277U1 (en) * 1988-09-07 1988-12-08 Passavant-Werke Ag, 65326 Aarbergen Device for securing filling, emptying and transfer points for environmentally hazardous liquids against entering the sewer system
FR2642745B1 (en) * 1989-02-08 1991-05-10 Saint Dizier Ste Cale Financie HYDROCARBON SEPARATORS WITH BY-PASS DEVICES
DE9305559U1 (en) * 1993-04-14 1993-07-01 Passavant-Werke AG, 6209 Aarbergen Coalescing separator

Also Published As

Publication number Publication date
EP0719363A1 (en) 1996-07-03
GR3022905T3 (en) 1997-06-30
DE9313924U1 (en) 1993-12-23
ES2098978T3 (en) 1997-05-01
DE59401982D1 (en) 1997-04-10
WO1995008031A1 (en) 1995-03-23
ATE149605T1 (en) 1997-03-15

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