EP0575899B1 - Test circuit device for a fault current protective circuit breaker - Google Patents

Test circuit device for a fault current protective circuit breaker Download PDF

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Publication number
EP0575899B1
EP0575899B1 EP93109744A EP93109744A EP0575899B1 EP 0575899 B1 EP0575899 B1 EP 0575899B1 EP 93109744 A EP93109744 A EP 93109744A EP 93109744 A EP93109744 A EP 93109744A EP 0575899 B1 EP0575899 B1 EP 0575899B1
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EP
European Patent Office
Prior art keywords
test
test key
pair
closed
switch
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
EP93109744A
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German (de)
French (fr)
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EP0575899A1 (en
Inventor
Rainer Berthold
Josef Robert Kalinski
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.)
ABB Patent GmbH
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ABB Patent GmbH
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Publication date
Application filed by ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP0575899A1 publication Critical patent/EP0575899A1/en
Application granted granted Critical
Publication of EP0575899B1 publication Critical patent/EP0575899B1/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
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly

Definitions

  • the invention relates to a test circuit arrangement according to the preamble of the claim.
  • Such a generally customary test circuit arrangement comprises a test circuit with a current limiting resistor, the tripping relay of the residual current circuit breaker and a switch which is actuated by means of a test button.
  • the test button closes the switch against the force of a spring, so that a current limited by the resistance flows through the trigger relay and actuates the trigger relay.
  • thermobimetal that is spatially close and electrically connected in series. If the test button is pressed for too long and current flows through the test resistor for too long, the thermobimetal heats up due to the test resistor and switches off the test circuit.
  • a certain problem is that the thermobimetal follows a certain heating characteristic, so that in unfavorable cases an arc can form on the thermobimetal for a relatively long time.
  • test device for a residual current circuit breaker has become known, in which the test device comprises a type of switch lock. This arrangement is relatively complex.
  • the object of the invention is to provide a test circuit arrangement of the type mentioned, in which a reliable test on the one hand and a safe shutdown on the other hand can be achieved with simple means.
  • Figure 1 shows a circuit arrangement of a test circuit as it can be used in residual current circuit breakers. A residual current circuit breaker is not shown, however.
  • a phase conductor L and a return conductor N are passed through the residual current circuit breaker and are connected to one another via a test circuit with the test current path 10.
  • a first switching element 11 which is formed from two parallel contact lugs 12 and 13, which are fixedly clamped at the left end (see drawing) and at the right end with a so-called movable contact piece 14 and a fixed contact piece 15 are provided.
  • the current path 10 is connected to the clamping point 16 of the contact tab 12.
  • a conductor piece 18 connects, in which a test resistor 19 is located.
  • the test resistor 19 is on the other hand connected to the clamping point 20 of a contact lug 21 of a second switch element 22, at the free end of which a fixed contact piece 23 is attached.
  • a movable contact piece 24 interacts with the fixed contact piece 23 and is attached to the free end of a contact lug 25, the clamping point 26 of which is connected to the return conductor N, the triggering relay 28 of the residual current circuit breaker being located in the line path 27.
  • the extension 32 of a test button 33 extends through openings 29, 30 and 31 in the contact tabs 12, 13 and 21, the extension 32 having a rim or edge strip or radial projection 34 which is so far from the free end 35 of the extension 32, that when the test button is depressed, the first switch element 11 is first closed and, after a brief closing phase, the contact tab 25 below is pressed into the dashed position 25 ', the movable contact piece 24 moving away from the fixed contact piece 23 into the position 24'.
  • the contact lug pairs 12, 13; 21, 25 are designed to be resiliently elastic, so that the two contact tabs 12, 13 can be bent resiliently at least via the strip 34, so that the contact tab 25 can be deflected.

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  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

A test circuit arrangement for a residual current device has a test circuit which is arranged between a phase conductor (L) and the return conductor (N) of a mains power supply and in which a current limiting resistor (19), the tripping relay (28) of the residual current device and a switch arrangement (11, 22) which can be operated by means of a test button (32, 33) are located which are connected in series with one another. This configuration prevents the current limiting resistor (19) burning out. The switch arrangment (11, 22) is constructed such that test circuit is closed only briefly during the operating process of the test button. In this case, the contact spring pair (14, 15) is closed first, and the initially closed contact spring pair (23, 24) is opened if the test button is pressed in further. <IMAGE>

Description

Die Erfindung betrifft eine Prüfkreisanordnung nach dem Oberbegriff des Patentanspruches.The invention relates to a test circuit arrangement according to the preamble of the claim.

Eine solche allgemein übliche Prüfkreisanordnung umfaßt einen Prüfstromkreis mit einem Strombegrenzungswiderstand, dem Auslöserelais des Fehlerstromschutzschalters und einem Schalter, der mittels einer Prüftaste betätigt ist. Die Prüftaste schließt den Schalter entgegen der Kraft einer Feder, so daß über das Auslöserelais ein durch den Widerstand begrenzter Strom fließt, der das Auslöserelais betätigt.Such a generally customary test circuit arrangement comprises a test circuit with a current limiting resistor, the tripping relay of the residual current circuit breaker and a switch which is actuated by means of a test button. The test button closes the switch against the force of a spring, so that a current limited by the resistance flows through the trigger relay and actuates the trigger relay.

Es hat sich herausgestellt, daß dann, wenn die Prüftaste und damit auch das Auslöserelais längere Zeit nicht betätigt worden sind, in einigen Fällen das Auslöserelais beim Drücken der Prüftaste nicht anspricht. Da der Widerstand aus Kosten- und Platzgründen unterdimensioniert ist, besteht die Gefahr, daß dann, wenn die Prüftaste zu lange gedrückt bleibt, im Falle des Nichtansprechens des Auslöserelais der Widerstand durchbrennt.It has been found that if the test button and thus the trigger relay have not been operated for a long time, in some cases the trigger relay does not respond when the test button is pressed. Since the resistor is undersized for reasons of cost and space, there is a risk that if the test button is held down too long, the resistor will blow if the trigger relay fails to respond.

Aus der DE-AS 10 67 928 ist ein Prüfkreis für einen Fehlerstromschutzschalter bekannt geworden, der einen Prüfwiderstand und ein diesem Prüfwiderstand räumlich nahe und elektrisch in Reihe geschaltetes Thermobimetall zugeordnet ist. Wenn die Prüftaste zu lange gedrückt ist und der Prüfwiderstand zu lange vom Strom durchflossen ist, erwärmt sich das Thermobimetall durch den Prüfwiderstand und schaltet den Prüfkreis ab. Ein gewisses Problem besteht darin, daß das Thermobimetall einer bestimmten Erwärmungscharakteristik folgt, so daß in ungünstigen Fällen relativ lange ein Lichtbogen am Thermobimetall entstehen kann.From DE-AS 10 67 928, a test circuit for a residual current circuit breaker has become known, which is assigned a test resistor and a thermobimetal that is spatially close and electrically connected in series. If the test button is pressed for too long and current flows through the test resistor for too long, the thermobimetal heats up due to the test resistor and switches off the test circuit. A certain problem is that the thermobimetal follows a certain heating characteristic, so that in unfavorable cases an arc can form on the thermobimetal for a relatively long time.

Aus dem DE-GM 19 92 095 ist ein Fehlerstromschutzschalter mit einer von einer Prüftaste zu betätigenden Prüfeinrichtung bekannt geworden, bei dem eine U-förmige Kontaktfeder von einer Prüftaste gegen einen Festkontakt gedrückt wird, wodurch der Prüfstromkreis geschlossen wird. Bei weiterem Eindrücken der Prüftaste gleitet die Kontaktfeder von dem Festkontaktstück ab und unterbricht damit den Prüfstromkreis. Bei dieser Anordnung besteht die Gefahr, daß bei einer bestimmten Stellung der Kontaktfeder der Prüfstromkreis geschlossen bleibt, so daß der Prüfwiderstand beschädigt werden kann.From DE-GM 19 92 095 a residual current circuit breaker with a test device to be operated by a test button is known, in which a U-shaped contact spring is pressed by a test button against a fixed contact, whereby the test circuit is closed. If the test button is pressed in further, the contact spring slides off the fixed contact piece and thus interrupts the test circuit. With this arrangement there is a risk that the test circuit remains closed at a certain position of the contact spring, so that the test resistor can be damaged.

Aus der DE-AS 11 52 745 ist eine Prüfeinrichtung für einen Fehlerstromschutzschalter bekannt geworden, bei der die Prüfeinrichtung eine Art Schaltschloß umfaßt. Diese Anordnung ist verhältnismäßig aufwendig.From DE-AS 11 52 745 a test device for a residual current circuit breaker has become known, in which the test device comprises a type of switch lock. This arrangement is relatively complex.

Aufgabe der Erfindung ist es, eine Prüfkreisanordnung der eingangs genannten Art zu schaffen, bei der mit einfachen Mitteln eine sichere Prüfung einerseits und ein sicheres Abschalten andererseits erzielt werden können.The object of the invention is to provide a test circuit arrangement of the type mentioned, in which a reliable test on the one hand and a safe shutdown on the other hand can be achieved with simple means.

Diese Aufgabe wird erfindungsgemäß gelöst durch die Merkmale des Patentanspruches.According to the invention, this object is achieved by the features of the patent claim.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung dargestellt ist, sollen die Erfindung, weitere vorteilhafte Ausgestaltungen und Verbesserungen und weitere Vorteile der Erfindung näher erläutert und beschrieben werden.The invention, further advantageous refinements and improvements and further advantages of the invention are to be explained and described in more detail with reference to the drawing, in which an exemplary embodiment of the invention is shown.

Es zeigen:

Figur 1
eine schematische Darstellung eines Prüfstromkreises mit eingesetztem Schalter und Prüftaste und
Figur 2
eine Aufsicht auf die Anordnung gemäß Figur 1.
Show it:
Figure 1
is a schematic representation of a test circuit with a switch and test button and
Figure 2
a supervision of the arrangement according to FIG. 1.

Die Figur 1 zeigt eine Schaltungsanordnung eines Prüfstromkreises, wie er in Fehlerstromschutzschaltern Verwendung finden kann. Ein Fehlerstromschutzschalter ist allerdings nicht dargestellt.Figure 1 shows a circuit arrangement of a test circuit as it can be used in residual current circuit breakers. A residual current circuit breaker is not shown, however.

Durch den Fehlerstromschutzschalter wird ein Phasenleiter L und ein Rückleiter N hindurchgeführt, welche über einen Prüfstromkreis mit dem Prüfstrompfad 10 miteinander verbunden sind. In dem Strompfad 10 befindet sich ein erstes Schaltelement 11, das aus zwei parallel zueinander verlaufenden Kontaktfahnen 12 und 13 gebildet ist, die am linken Ende (siehe Zeichnung) ortsfest eingespannt und am rechten Ende mit einem sog. beweglichen Kontaktstück 14 und einem festen Kontaktstück 15 versehen sind. Der Strompfad 10 ist mit der Einspannstelle 16 der Kontaktfahne 12 verbunden. An der Einspannstelle 17 der Kontaktfahne 13 schließt ein Leiterstück 18 an, in dem sich ein Prüfwiderstand 19 befindet. Der Prüfwiderstand 19 ist andererseits mit der Einspannstelle 20 einer Kontaktfahne 21 eines zweiten Schalterelementes 22 verbunden, an dessen freiem Ende ein festes Kontaktstück 23 angebracht ist. Mit dem festen Kontaktstück 23 wirkt ein bewegliches Kontaktstück 24 zusammen, das am freien Ende einer Kontaktfahne 25 befestigt ist, deren Einspannstelle 26 mit dem Rückleiter N verbunden ist, wobei sich in dem Leitungspfad 27 das Auslöserelais 28 des Fehlerstromschutzschalters befindet.A phase conductor L and a return conductor N are passed through the residual current circuit breaker and are connected to one another via a test circuit with the test current path 10. In the current path 10 there is a first switching element 11, which is formed from two parallel contact lugs 12 and 13, which are fixedly clamped at the left end (see drawing) and at the right end with a so-called movable contact piece 14 and a fixed contact piece 15 are provided. The current path 10 is connected to the clamping point 16 of the contact tab 12. At the clamping point 17 of the contact lug 13, a conductor piece 18 connects, in which a test resistor 19 is located. The test resistor 19 is on the other hand connected to the clamping point 20 of a contact lug 21 of a second switch element 22, at the free end of which a fixed contact piece 23 is attached. A movable contact piece 24 interacts with the fixed contact piece 23 and is attached to the free end of a contact lug 25, the clamping point 26 of which is connected to the return conductor N, the triggering relay 28 of the residual current circuit breaker being located in the line path 27.

Durch Öffnungen 29, 30 und 31 in den Kontaktfahnen 12, 13 und 21 greift der Fortsatz 32 einer Prüftaste 33 hindurch, wobei der Fortsatz 32 einen Randbord oder Randleiste oder radialen Vorsprung 34 aufweist, welche vom freien Ende 35 des Fortsatzes 32 soweit entfernt ist, daß beim Niederdrücken der Prüftaste zuerst das erste Schalterelement 11 geschlossen wird und nach einer kurzzeitigen Schließphase die unten liegende Kontaktfahne 25 in die strichlierte Stellung 25' gedrückt wird, wobei sich das bewegliche Kontaktstück 24 vom festen Kontaktstück 23 in die Stellung 24' entfernt.The extension 32 of a test button 33 extends through openings 29, 30 and 31 in the contact tabs 12, 13 and 21, the extension 32 having a rim or edge strip or radial projection 34 which is so far from the free end 35 of the extension 32, that when the test button is depressed, the first switch element 11 is first closed and, after a brief closing phase, the contact tab 25 below is pressed into the dashed position 25 ', the movable contact piece 24 moving away from the fixed contact piece 23 into the position 24'.

Dadurch, daß relativ kurzzeitig nach dem Schließen des ersten Schalterelementes 11 das zweite Schalterelement 22 öffnet, fließt durch das Auslöserelais 28 ein zu dessen Betätigung ausreichender Strom, allerdings nur kurzzeitig, damit der durch den Widerstand 19 fließende Strom letzteren nicht zerstört.Due to the fact that the second switch element 22 opens relatively shortly after the first switch element 11 closes, a current sufficient to actuate it flows through the trigger relay 28, but only briefly so that the current flowing through the resistor 19 does not destroy the latter.

Die Kontaktfahnenpaare 12, 13; 21, 25 sind in sich federnd elastisch ausgebildet, so daß zumindest über die Leiste 34 die beiden Kontaktfahnen 12, 13 federnd gebogen werden können, damit die Kontaktfahne 25 ausgelenkt werden kann.The contact lug pairs 12, 13; 21, 25 are designed to be resiliently elastic, so that the two contact tabs 12, 13 can be bent resiliently at least via the strip 34, so that the contact tab 25 can be deflected.

Claims (1)

  1. Test circuit arrangement for a residual-current-operated circuit-breaker, having a test circuit arranged between a phase conductor and the return conductor of a network in which there are located in each case in series with one another a current-limiting resistor, the tripping relay of the residual-current-operated circuit-breaker and a switch arrangement which can be operated by means of a test key and has two switch elements (11, 22), it being the case that in the off state the first switch element (11) of the switch elements (11, 22) is open and the second switch element (22) thereof is closed, and both switch elements are arranged and assigned relative to one another and to the test key such that during the depression of the test key (33, 32) the first switch element (11) is closed and thereafter only the second switch element is opened, with the result that the test circuit is only briefly closed during the operating process of the test key, characterized in that the switch elements (11, 12 [sic]) each have a pair of contact springs (14, 15; 23, 24) which, seen in the direction of movement of the test key (32, 33), are situated one above the other, in that by means of an extension (32) the test key (32, 33) penetrates the contact springs (14, 15) of one pair, which is initially open and situated next to the test key (32, 33), and the contact spring (23), adjacent to the test key, of the other, initially closed pair (23, 24), in that the extension (32) has a radial projection (34), and in that the projection is attached to the extension (32) in such a way that the projection (34) closes one contact spring pair (14, 15), situated next to the test key (32, 33), and upon further depression of the test key (32, 33) the extension (32) opens the other contact spring (24) of the other pair (23, 24) shortly after the closure of the one contact spring pair (14, 15).
EP93109744A 1992-06-24 1993-06-18 Test circuit device for a fault current protective circuit breaker Expired - Lifetime EP0575899B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4220569 1992-06-24
DE4220569A DE4220569A1 (en) 1992-06-24 1992-06-24 Test circuit arrangement for a residual current circuit breaker

Publications (2)

Publication Number Publication Date
EP0575899A1 EP0575899A1 (en) 1993-12-29
EP0575899B1 true EP0575899B1 (en) 1996-04-03

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ID=6461650

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Application Number Title Priority Date Filing Date
EP93109743A Ceased EP0575898A1 (en) 1992-06-24 1993-06-18 Test circuit device for a fault current protective circuit breaker
EP93109744A Expired - Lifetime EP0575899B1 (en) 1992-06-24 1993-06-18 Test circuit device for a fault current protective circuit breaker

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP93109743A Ceased EP0575898A1 (en) 1992-06-24 1993-06-18 Test circuit device for a fault current protective circuit breaker

Country Status (4)

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EP (2) EP0575898A1 (en)
AT (1) ATE136397T1 (en)
DE (2) DE4220569A1 (en)
ES (1) ES2088192T3 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1067928B (en) * 1959-02-23 1959-10-29 Schiele Verwaltungsgesellschaft m.b.H., Hornberg Schwarzwaldbahn Test arrangement for residual current circuit breakers
DE1152745B (en) * 1961-11-15 1963-08-14 Emil Quermann Test device for circuit breaker
DE1902098U (en) * 1964-07-08 1964-10-15 Krone Kg CONTACT BUTTON.
NL6802096A (en) * 1967-02-22 1968-08-23
DE1992095U (en) * 1968-04-05 1968-08-22 Siemens Aktiengesellschaft, 1000 Berlin und 8000 München Residual current circuit breaker with a test device to be actuated by a test button
DE2428866B2 (en) * 1974-06-14 1976-07-08 FAULT CURRENT SWITCH WITH TEST BUTTON
DE2829407C2 (en) * 1978-07-05 1985-01-24 Gossen Gmbh, 8520 Erlangen Test method for residual current or residual voltage circuit breaker in an electrical system and circuit arrangement for carrying out the test method
DE2943725C2 (en) * 1979-10-30 1984-07-19 Brown, Boveri & Cie Ag, 6800 Mannheim Procedure for testing a residual current device with a summation current transformer and facilities for carrying out the procedure
DE3032826C2 (en) * 1980-08-30 1985-11-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Residual current circuit breaker with a test button for switching on a resistor in a test circuit

Also Published As

Publication number Publication date
ES2088192T3 (en) 1996-08-01
ATE136397T1 (en) 1996-04-15
DE59302090D1 (en) 1996-05-09
DE4220569A1 (en) 1994-01-05
EP0575898A1 (en) 1993-12-29
EP0575899A1 (en) 1993-12-29

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