EP0451480A1 - Fault-current protective switch in module construction - Google Patents

Fault-current protective switch in module construction Download PDF

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Publication number
EP0451480A1
EP0451480A1 EP91102913A EP91102913A EP0451480A1 EP 0451480 A1 EP0451480 A1 EP 0451480A1 EP 91102913 A EP91102913 A EP 91102913A EP 91102913 A EP91102913 A EP 91102913A EP 0451480 A1 EP0451480 A1 EP 0451480A1
Authority
EP
European Patent Office
Prior art keywords
switch
width
module
fault
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.)
Granted
Application number
EP91102913A
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German (de)
French (fr)
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EP0451480B1 (en
Inventor
Klaus-Dieter Dipl.-Ing. Kersten
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.)
Felten and Guilleaume Energietechnik AG
Original Assignee
Felten and Guilleaume Energietechnik AG
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Application filed by Felten and Guilleaume Energietechnik AG filed Critical Felten and Guilleaume Energietechnik AG
Publication of EP0451480A1 publication Critical patent/EP0451480A1/en
Application granted granted Critical
Publication of EP0451480B1 publication Critical patent/EP0451480B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H2011/0093—Standardization, e.g. limiting the factory stock by limiting the number of unique, i.e. different components

Definitions

  • the invention relates to a residual current circuit breaker according to the preamble of claim 1.
  • Such a residual current circuit breaker is already known (DE-PS 23 55 306).
  • the total current transformer and parts of the test device are arranged in a movable carrier part, which is also equipped with movable contact pieces of the contact set.
  • the summation current transformer and the carrier part with the contact pieces thus form a prefabricated unit which enables the residual current circuit breaker to be easily assembled.
  • the design of the movable support part only permits a limited number of switch variants, since the dimensions required for the switch housings would be difficult or impossible to maintain. In any case, this would involve considerable additional effort.
  • the invention is based on the object of developing a residual current circuit breaker for a switch family which, from two-pole residual current circuit breakers in the range from 16 to 40 A to four-pole residual current circuit breakers in the range from 40 to 125 A, covers the entire protection range with a back-up fuse of 100 A at rated currents up to 100 A. and a back-up fuse of 125 A with rated currents up to 125 A and a switching capacity of 10 kA.
  • a four-pole residual current circuit breaker is shown as a base switch for the switch family.
  • the associated switch housing consists of a lower part 1 with a base plate 2 and an upper part 3.
  • An intermediate plate 4 which is arranged parallel to the base plate 2 , leads to a division of the interior of the housing into two chambers.
  • one chamber is formed by the base plate 2 and the intermediate plate 4 and partitions 5 and 6 .
  • the other chamber is created in the space between the upper part 3 and the intermediate plate 4.
  • niches for access terminals 7 and outgoing terminals 8 are provided in the chamber in the lower part 1 in the housing.
  • an extinguishing device 9 In the chamber in the lower part 1 there is an extinguishing device 9, a contact set 10 and a switching drum 11.
  • a switching lock 12 is located in the upper part 3 of the housing and can only be seen in FIG. 3. Furthermore, a summation current transformer 13, a tripping device 14, a test device 15, consisting of a test button and test resistor arrangement, and a contact position display device 16 are also used in the upper part.
  • FIG. 4 shows the basic switch of the switch family, namely a four-pole residual current circuit breaker with a module width of 4M for 63 A.
  • the version for 40 A is a residual current circuit breaker with a module width of 3M according to FIG. 5.
  • the variant for 100 A is a residual current circuit breaker with a module width of 4M and according to FIG. 7 for 125 A is a residual current circuit breaker with a module width of 5M.
  • Figures 5 to 7 four-pole residual current circuit breakers are taken into account.
  • Two variants are shown for the two-pole residual current circuit breakers. According to FIG. 8, this is a residual current circuit breaker for 80 A with a module width of 3M and for 40 A a residual current circuit breaker with a module width of 2M, as shown in FIG. 9.
  • a uniform cap dimension A is provided for all switches in the switch family.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Fuses (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

2.1 Fault-current protection switches for different rated currents have been in use for a long time in different designs with considerably different dimensions. Because of a requirement for a switching performance of 10 kA with a back-up fuse of 100 A, it is unavoidable to search in new ways for fault-current protection switches which cover a range of rated currents from 16 to 125 A. 2.2 The invention exhibits a fault-current protection switch which, based on a four-way basic switch for 63 A (module width 4M), covers the complete protection range from a two-way design for 40 A (module width 2M) up to the four-way design for 125 A (module width 5M). An extinguishing device (9), a contact set (10) and a drum controller (11) for each switch pole are inserted, corresponding to the width of a module (1M), in all switches in a lower part (1) of the housing, and a switch locking mechanism (12), including a trip device (14) having a module width (1M), a summing current transformer (13), a test device (15) and a contact position indicating device (16) are arranged in the upper part (3) of the housing. The high content of common components and the assembly sequence which is always the same, that is to say the virtually identical internal construction of the switches for different rated current intensities, leads to a switch family which extends from two-way fault-current protection switches which are 2 modules wide up to four-way fault-current protection switches which are 5 modules wide. 2.3 Such fault-current protection switches are provided for high powers in low-voltage networks. <IMAGE>

Description

Die Erfindung betrifft einen Fehlerstromschutzschalter gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a residual current circuit breaker according to the preamble of claim 1.

Ein derartiger Fehlerstromschutzschalter ist bereits bekannt (DE-PS 23 55 306). Bei diesem Schalter sind der Summenstromwandler und Teile der Prüfeinrichtung in einem bewegbaren Trägerteil angeordnet, das außerdem mit beweglichen Kontaktstücken des Kontaktsatzes ausgestattet ist. Der Summenstromwandler und das Trägerteil mit den Kontaktstücken bilden somit eine vorgefertigte Einheit, die einen leichten Zusammenbau des Fehlerstromschutzschalters ermöglicht. Die Konzeption des bewegbaren Trägerteils läßt allerdings Schaltervarianten nur im geringen Umfang zu, da die erforderlichen Abmessungen für die Schaltergehäuse gar nicht oder nur schwer einzuhalten wären. In jedem Fall wäre dies mit einem erheblichen Mehraufwand verbunden.Such a residual current circuit breaker is already known (DE-PS 23 55 306). In this switch, the total current transformer and parts of the test device are arranged in a movable carrier part, which is also equipped with movable contact pieces of the contact set. The summation current transformer and the carrier part with the contact pieces thus form a prefabricated unit which enables the residual current circuit breaker to be easily assembled. The design of the movable support part, however, only permits a limited number of switch variants, since the dimensions required for the switch housings would be difficult or impossible to maintain. In any case, this would involve considerable additional effort.

Der Erfindung liegt nun die Aufgabe zugrunde, einen Fehlerstromschutzschalter für eine Schalterfamilie zu entwickeln, die von zweipoligen Fehlerstromschutzschaltern im Bereich 16 bis 40 A bis zu vierpoligen Fehlerstromschutzschaltern im Bereich 40 bis 125 A den gesamten Schutzbereich bei einer Vorsicherung von 100 A bei Nennströmen bis 100 A und einer Vorsicherung von 125 A bei Nennströmen bis 125 A und einer Schaltleistung von 10 kA abdeckt.The invention is based on the object of developing a residual current circuit breaker for a switch family which, from two-pole residual current circuit breakers in the range from 16 to 40 A to four-pole residual current circuit breakers in the range from 40 to 125 A, covers the entire protection range with a back-up fuse of 100 A at rated currents up to 100 A. and a back-up fuse of 125 A with rated currents up to 125 A and a switching capacity of 10 kA.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 angegebene Kombination von konstruktiven Merkmalen gelöst.This object is achieved according to the invention by the combination of design features specified in the characterizing part of claim 1.

Die mit der Erfindung erzielten Vorteile bestehen darin, daß die verschiedenen Schalter der Familie mit einem hohen Gleichteileanteil ausgestattet werden können und die Fügefolgen, das heißt der innere Aufbau, nahezu immer gleich bleibt.The advantages achieved by the invention are that the various switches in the family have a high proportion of common parts can be equipped and the joining sequences, i.e. the internal structure, almost always remain the same.

Vorteilhafte Weiter- und Ausbildungen des Gegenstandes nach Anspruch 1 sind in Unteransprüchen gekennzeichnet.Advantageous further developments and developments of the subject matter according to claim 1 are characterized in the subclaims.

Ein Ausführungsbeispiel ist in Zeichnungen dargestellt und wird im folgenden näher erläutert. Es zeigen

Fig. 1
einen Fehlerstromschutzschalter in Seitenansicht und im Schnitt
Fig. 2
das bestückte Unterteil dieses Fehlerstromschutzschalters bei abgenommener Zwischenplatte in Draufsicht
Fig. 3
diesen Fehlerstromschutzschalter bei abgenommenem Oberteil in Draufsicht
Fig. 4
bis Fig. 9 die vollständige Schalterfamilie in Draufsicht.
An embodiment is shown in drawings and is explained in more detail below. Show it
Fig. 1
a residual current circuit breaker in side view and in section
Fig. 2
the assembled lower part of this residual current circuit breaker with the intermediate plate removed in plan view
Fig. 3
this residual current circuit breaker with the upper part removed in plan view
Fig. 4
to Fig. 9 the complete switch family in plan view.

In den Figuren 1 bis 3 ist ein vierpoliger Fehlerstromschutzschalter als Basisschalter für die Schalterfamilie dargestellt. Das zugehörige Schaltergehäuse besteht aus einem Unterteil 1 mit einer Bodenplatte 2 und einem Oberteil 3. Eine Zwischenplatte 4, die parallel zur Bodenplatte 2 angeordnet ist, führt zu einer Teilung des Gehäuseinneren in zwei Kammern. Im Unterteil des Gehäuses wird die eine Kammer durch die Bodenplatte 2 und die Zwischenplatte 4 und Trennwänden 5 und 6 gebildet. Die andere Kammer entsteht in dem Raum zwischen dem Oberteil 3 und der Zwischenplatte 4. Im Gehäuse sind Nischen für Zugangsklemmen 7 und Abgangsklemmen 8 vorgesehen. In der Kammer im Unterteil 1 befindet sich eine Löscheinrichtung 9, ein Kontaktsatz 10 und eine Schaltwalze 11. Ein Schaltschloß 12 befindet sich im Oberteil 3 des Gehäuses und ist lediglich der Fig. 3 zu entnehmen. Ferner sind im Oberteil noch ein Summenstromwandler 13, eine Auslöseeinrichtung 14, eine Prüfeinrichtung 15, bestehend aus einer Prüftaste und Prüfwiderstandsanordnung, sowie eine Kontaktstellungsanzeigevorrichtung 16 eingesetzt.In Figures 1 to 3, a four-pole residual current circuit breaker is shown as a base switch for the switch family. The associated switch housing consists of a lower part 1 with a base plate 2 and an upper part 3. An intermediate plate 4, which is arranged parallel to the base plate 2 , leads to a division of the interior of the housing into two chambers. In the lower part of the housing, one chamber is formed by the base plate 2 and the intermediate plate 4 and partitions 5 and 6 . The other chamber is created in the space between the upper part 3 and the intermediate plate 4. In the housing, niches for access terminals 7 and outgoing terminals 8 are provided. In the chamber in the lower part 1 there is an extinguishing device 9, a contact set 10 and a switching drum 11. A switching lock 12 is located in the upper part 3 of the housing and can only be seen in FIG. 3. Furthermore, a summation current transformer 13, a tripping device 14, a test device 15, consisting of a test button and test resistor arrangement, and a contact position display device 16 are also used in the upper part.

In Fig. 4 ist der Basisschalter der Schalterfamilie, nämlich ein vierpoliger Fehlerstromschutzschalter mit einer Modulbreite von 4M für 63 A dargestellt. Die Variante für 40 A ist ein Fehlerstromschutzschalter mit einer Modulbreite von 3M nach Fig. 5.4 shows the basic switch of the switch family, namely a four-pole residual current circuit breaker with a module width of 4M for 63 A. The version for 40 A is a residual current circuit breaker with a module width of 3M according to FIG. 5.

Nach Fig. 6 ist die Variante für 100 A ein Fehlerstromschutzschalter mit einer Modulbreite von 4M und nach Fig. 7 für 125 A ein Fehlerstromschutzschalter mit einer Modulbreite von 5M. In den Figuren 5 bis 7 sind jeweils vierpolige Fehlerstromschutzschalter berücksichtigt. Bei den zweipoligen Fehlerstromschutzschaltern sind zwei Varianten dargestellt. Nach Fig. 8 ist dies ein Fehlerstromschutzschalter für 80 A mit einer Modulbreite von 3M und für 40 A ein Fehlerstromschutzschalter mit einer Modulbreite von 2M, wie in Fig. 9 dargestellt.According to FIG. 6, the variant for 100 A is a residual current circuit breaker with a module width of 4M and according to FIG. 7 for 125 A is a residual current circuit breaker with a module width of 5M. In Figures 5 to 7 four-pole residual current circuit breakers are taken into account. Two variants are shown for the two-pole residual current circuit breakers. According to FIG. 8, this is a residual current circuit breaker for 80 A with a module width of 3M and for 40 A a residual current circuit breaker with a module width of 2M, as shown in FIG. 9.

Für sämtliche Schalter der Schalterfamilie ist ein einheitliches Kappenmaß A vorgesehen.A uniform cap dimension A is provided for all switches in the switch family.

Claims (5)

Fehlerstrom-Schutzschalter, mit einem aus einem Unterteil und einem Oberteil gebildeten Gehäuse zur Aufnahme mehrerer Schalterpole, mit einem zu den Schalterpolen gehörenden Schaltmechanismus, mit einer Auslöseeinrichtung, mit einem Summenstromwandler und mit Zu- und Abgangsklemmen, dadurch gekennzeichnet, daß das Innere des Unterteils (1) vom Oberteil (3) durch eine zu einer Bodenplatte (2) des Unterteils (1) parallel angeordnete Zwischenplatte (4) abtrennbar ist, daß in einer durch die Boden- (2) und Zwischenplatte (4) und seitlichen Trennwänden (5, 6) zu den Zu- (7) und Abgangsklemmen (8) gebildeten Kammer für jeden Schalterpol entsprechend der Breite eines Moduls (1M) eine Löscheinrichtung (9) und ein Kontaktsatz (10) mit einer Schaltwalze (11) eingesetzt sind, daß im Oberteil (3) ein Schaltschloß (12) und die Auslöseeinrichtung (14) zusammen mit dem Summenstromwandler (13) derart angeordnet sind, daß das Schaltschloß (12) und die Auslöseeinrichtung (14) zusammen in einem Raum von der Breite eines Moduls (1M) untergebracht sind, und daß die Varianten für die Schalter verschiedener Nennstromstärken mit gleichen Teilen, wie Schaltschloß (12), Auslöseeinrichtung (14) Löscheinrichtung (9), Prüfeinrichtung (15) und Kontaktstellungsanzeigevorrichtung (16) bestückbar sind, wobei die Breite (Anzahl der Module) jeweils durch die Größe des Summenstromwandlers (13) und die Länge der Schaltwalze (11) und die Schalterhöhe allein durch die Größe der Zu- (7) und Abgangsklemmen (8) bei gleichem Kappenmaß (A) für alle Varianten bestimmt sind.Residual current circuit breaker, with a housing formed from a lower part and an upper part for receiving several switch poles, with a switching mechanism belonging to the switch poles, with a tripping device, with a summation current transformer and with input and output terminals, characterized in that the interior of the lower part ( 1) can be separated from the upper part (3) by an intermediate plate ( 4) arranged parallel to a base plate (2) of the lower part (1) , that in a through the base (2) and intermediate plate (4) and side partition walls (5, 6) to the inlet (7) and outlet terminals (8) formed chamber for each switch pole corresponding to the width of a module (1M) an extinguishing device (9) and a contact set (10) with a switching drum (11) are used that in the upper part (3) a switch lock (12) and the trigger device (14) together with the summation current transformer (13) are arranged such that the switch lock ( 12) and the trigger device (14) together in e are housed in a room the width of a module (1M) , and that the variants for the switches of different nominal current intensities with the same parts, such as switch lock ( 12), triggering device (14) , extinguishing device (9), test device (15) and contact position indicator (16) Can be equipped, the width (number of modules) each due to the size of the summation current transformer (13) and the length of the switching drum (11) and the switch height solely through the size of the inlet (7) and outlet terminals ( 8) with the same cap size ( A) are intended for all variants. Fehlerstromschutzschalter nach Anspruch 1, dadurch gekennzeichnet, daß die Auslöseeinrichtung (14) in dem von zwei Schloßplatten eingefaßten Schaltschloß (12) eingesetzt ist, und daß die Schloßplatten einen Abstand aufweisen, der der Breite eines Moduls (1M) entspricht.Residual current circuit breaker according to Claim 1, characterized in that the triggering device (14) is inserted in the switching lock ( 12) bordered by two lock plates , and in that the lock plates are at a distance which corresponds to the width of a module (1M) . Fehlerstromschutzschalter nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß als Basisschalter für die Schaltervarianten ein vierpoliger Schalter für 63 A mit einer vierfachen Modulbreite (4M) ausgeführt ist.Residual current circuit breaker according to one of claims 1 or 2, characterized in that a four-pole switch for 63 A with a four-fold module width (4M) is designed as the basic switch for the switch variants. Fehlerstromschutzschalter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die vierpoligen Schaltervarianten für 40 A mit einer dreifachen Modulbreite (3M), für 100 A mit einer vierfachen Modulbreite (4M) und für 125 A mit einer fünfachen Modulbreite (5M) ausgeführt sind.Residual current circuit breaker according to one of Claims 1 to 3, characterized in that the four-pole switch variants are designed for 40 A with three times the module width (3M), for 100 A with four times the module width (4M) and for 125 A with five times the module width (5M) . Fehlerstromschutzschalter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die zweipoligen Schaltervarianten für 80 A mit einer dreifachen Modulbreite (3M) und für 40 A mit einer zweifachen Modulbreite (2M) ausgeführt sind.Residual current circuit breaker according to one of Claims 1 to 3, characterized in that the two-pole switch variants are designed for 80 A with a triple module width (3M) and for 40 A with a double module width (2M) .
EP91102913A 1990-04-07 1991-02-28 Fault-current protective switch in module construction Expired - Lifetime EP0451480B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4011336A DE4011336A1 (en) 1990-04-07 1990-04-07 Fault current circuit breaker in modular design
DE4011336 1990-04-07

Publications (2)

Publication Number Publication Date
EP0451480A1 true EP0451480A1 (en) 1991-10-16
EP0451480B1 EP0451480B1 (en) 1994-09-21

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Family Applications (1)

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EP91102913A Expired - Lifetime EP0451480B1 (en) 1990-04-07 1991-02-28 Fault-current protective switch in module construction

Country Status (7)

Country Link
EP (1) EP0451480B1 (en)
JP (1) JPH04230928A (en)
CN (1) CN1032037C (en)
AT (1) ATE112094T1 (en)
AU (1) AU630025B2 (en)
DE (2) DE4011336A1 (en)
ES (1) ES2060219T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9004895U1 (en) * 1990-04-30 1990-06-28 Felten & Guilleaume Energietechnik AG, 5000 Köln Contact device for residual current circuit breaker
DE29620519U1 (en) * 1996-11-25 1997-02-06 Heinrich Kopp Ag, 63796 Kahl Contact arrangement for residual current circuit breakers
CN102568944A (en) * 2012-02-10 2012-07-11 上海巢安电气有限公司 Small-sized circuit breaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6753179U (en) * 1968-09-28 1969-04-17 Siemens Ag FAULT CIRCUIT BREAKER
DE2355306B1 (en) * 1973-11-06 1974-05-09 Felten & Guilleaume Schaltanl Residual current circuit breaker
DE2504007A1 (en) * 1974-02-08 1975-08-14 Schrack Elektrizitaets Ag E Overload protective cct. breaker - has socket with switching contacts as separate component module with integral support
DE2440048B2 (en) * 1974-08-21 1977-06-23 Condor-Werk Gebr. Frede Kg, Elektro- Und Maschinenfabrik, 4415 Westkirchen FAULT CURRENT CIRCUIT BREAKER

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604294B1 (en) * 1986-09-23 1994-05-20 Merlin Et Gerin MULTIPOLAR DIFFERENTIAL CIRCUIT BREAKER WITH MODULAR ASSEMBLY

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6753179U (en) * 1968-09-28 1969-04-17 Siemens Ag FAULT CIRCUIT BREAKER
DE2355306B1 (en) * 1973-11-06 1974-05-09 Felten & Guilleaume Schaltanl Residual current circuit breaker
DE2504007A1 (en) * 1974-02-08 1975-08-14 Schrack Elektrizitaets Ag E Overload protective cct. breaker - has socket with switching contacts as separate component module with integral support
DE2440048B2 (en) * 1974-08-21 1977-06-23 Condor-Werk Gebr. Frede Kg, Elektro- Und Maschinenfabrik, 4415 Westkirchen FAULT CURRENT CIRCUIT BREAKER

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELEKTROTECHNIK, vol. 61, no. 6, März 1979, WURZBURG, DE; Seiten 18 - 24; H.Eisler, H. Heindorf: "Mehr Schutz mit LS/FI-Schalter" *

Also Published As

Publication number Publication date
AU630025B2 (en) 1992-10-15
AU7398291A (en) 1991-12-12
JPH04230928A (en) 1992-08-19
EP0451480B1 (en) 1994-09-21
DE59102990D1 (en) 1994-10-27
ATE112094T1 (en) 1994-10-15
CN1032037C (en) 1996-06-12
ES2060219T3 (en) 1994-11-16
DE4011336A1 (en) 1991-10-10
CN1056185A (en) 1991-11-13

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