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EP0876675A1 - Electrical switching device - Google Patents

Electrical switching device

Info

Publication number
EP0876675A1
EP0876675A1 EP97901046A EP97901046A EP0876675A1 EP 0876675 A1 EP0876675 A1 EP 0876675A1 EP 97901046 A EP97901046 A EP 97901046A EP 97901046 A EP97901046 A EP 97901046A EP 0876675 A1 EP0876675 A1 EP 0876675A1
Authority
EP
European Patent Office
Prior art keywords
contact
state
switching device
contact bridge
bridge
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
EP97901046A
Other languages
German (de)
French (fr)
Other versions
EP0876675B1 (en
Inventor
Reinhard Herbst
Bardo Koppmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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
Priority claimed from DE19602118A external-priority patent/DE19602118C2/en
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP97901046A priority Critical patent/EP0876675B1/en
Publication of EP0876675A1 publication Critical patent/EP0876675A1/en
Application granted granted Critical
Publication of EP0876675B1 publication Critical patent/EP0876675B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/001—Means for preventing or breaking contact-welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/546—Contact arrangements for contactors having bridging contacts

Definitions

  • the invention relates to an electrical switching device with an electromagnetic system, with an arcing chamber, with fixed contacts, with a contact bridge with movable contacts, with a contact carrier with a window in which the contact bridge is held by a contact spring with the installation dimension C, with the OFF -State of the electromagnet system, the fixed contacts are at a distance ⁇ from the movable contacts and, when the electromagnet system is in the ON state, the contact spring experiences a pressure D, so that the contact carrier between the ON and OFF state and vice versa the path D + ⁇ covered.
  • a generic switching device can be found in DE 41 04 533 C2. If a short circuit occurs with this switching device in the ON state, then short-circuit current forces act on the contact bridge, which move the contact bridge in the open position. The contact spring is compressed to the block dimension and then the contact carrier is torn upwards. The forces that occur can have a destructive effect on the contact carrier.
  • the invention is therefore based on the object of providing an electrical switching device of the type mentioned above, in which destructive stresses on the contact carrier as a result of short-circuit current forces are avoided.
  • stops are provided on the arcing box which are at a distance A from the contact bridge in the OFF state such that in the event of a short circuit with the electromagnet system switched on, they were caused by the short-circuit current forces Opening movement of the Limit the contact bridge so that the contact spring is not compressed to its block dimension B.
  • FIG. 2 shows the contact system according to FIG. 1 in the ON state and
  • FIG. 3 shows the contact system according to FIG. 2 in the ON state when a short-circuit current occurs.
  • FIG. 1 shows a contact system of an electromagnetic switching device. It is accommodated in an arc chamber (not shown here in more detail) with extinguishing plates 1 and is composed essentially of fixed contacts 2, movable contacts 3 on a contact bridge 4, a contact carrier 5 with a window 6 and a contact spring 7.
  • the contact spring 7 presses the contact bridge 4 onto the lower edge of the window 6 and has an installation dimension of length C.
  • the movable contacts 3 are located at a distance ⁇ from the fixed contacts 2.
  • stops 8 are provided at a distance A from the latter, which are advantageously firmly connected to the arc chamber, e.g. are molded onto this.
  • the contact carrier 5 is moved by the magnet armature (not shown here) down the path D + O with respect to the ON state, with D being the pressure of the contact spring 7 in the ON state is designated.
  • the contact bridge 4 has the distance A + ⁇ from the stops 8.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

The invention concerns an electrical switching device where destructive loading of the contact support (5) on appearance of short circuit forces in the on position is avoided. This is achieved by stops (8) in the extinction chamber which stop the opening movement of the contact bridge (4) before the contact spring (7) is compressed up to its closed length.

Description

Beschreibungdescription

Elektrisches SchaltgeratElectrical switchgear

Die Erfindung bezieht sich auf ein elektrisches Schaltgerät mit einem Elektromagnetsystem, mit einer Lichtbogenkammer, mit Festkontakten, mit einer Kontaktbrücke mit beweglichen Kontakten, mit einem Kontaktträger mit einem Fenster, in dem die Kontaktbrücke über eine Kontaktfeder mit dem Einbaumaß C gehalten ist, wobei im AUS-Zustand des Elektromagnetsystems die Festkontakte einen Abstand Ö von den beweglichen Kontak¬ ten aufweisen und wobei im EIN-Zustand des Elektromagnetsy¬ stems die Kontaktfeder einen Durchdruck D erfährt, so daß der Kontaktträger zwischen EIN- und AUS-Zustand und umgekehrt den Weg D + Ö zurücklegt.The invention relates to an electrical switching device with an electromagnetic system, with an arcing chamber, with fixed contacts, with a contact bridge with movable contacts, with a contact carrier with a window in which the contact bridge is held by a contact spring with the installation dimension C, with the OFF -State of the electromagnet system, the fixed contacts are at a distance Ö from the movable contacts and, when the electromagnet system is in the ON state, the contact spring experiences a pressure D, so that the contact carrier between the ON and OFF state and vice versa the path D + Ö covered.

Ein gattungsgemäßes Schaltgerät ist der DE 41 04 533 C2 zu entnehmen. Tritt bei diesem Schaltgerät im EIN-Zustand ein Kurzschluß auf, so werden an der Kontaktbrücke Kurzschluß- stromkräfte wirksam, die die Kontaktbrücke in Öffnungsstel¬ lung bewegen. Dabei wird die Kontaktfeder bis auf Blockmaß zusammengedrückt und danach der Kontaktträger nach oben ge¬ rissen. Die dabei auftretenden Kräfte können auf den Kontakt- träger zerstörerisch einwirken.A generic switching device can be found in DE 41 04 533 C2. If a short circuit occurs with this switching device in the ON state, then short-circuit current forces act on the contact bridge, which move the contact bridge in the open position. The contact spring is compressed to the block dimension and then the contact carrier is torn upwards. The forces that occur can have a destructive effect on the contact carrier.

Daher liegt der Erfindung die Aufgabe zugrunde, ein elektri¬ sches Schaltgerät der oben genannten Art zu schaffen, bei dem zerstörerische Beanspruchungen des Kontaktträgers in Folge von Kurzschlußstromkräften vermieden werden.The invention is therefore based on the object of providing an electrical switching device of the type mentioned above, in which destructive stresses on the contact carrier as a result of short-circuit current forces are avoided.

Diese Aufgabe wird dadurch erreicht, daß an der den Festkon¬ takten der Kontaktbrücke abgewandten Seite Anschläge an der Lichtbogenkaitimer vorgesehen sind, die von der Kontaktbrücke im AUS-Zustand einen solchen Abstand A aufweisen, daß sie im Kurzschlußfall bei eingeschaltetem Elektromagnetsystem die durch die Kurzschlußstroπikräfte bedingte Öffnungεbewegung der Kontaktbrücke derart begrenzen, daß die Kontaktfeder dabei nicht auf ihr Blockmaß B zusammengedrückt wird.This object is achieved in that on the side facing away from the fixed contacts of the contact bridge, stops are provided on the arcing box which are at a distance A from the contact bridge in the OFF state such that in the event of a short circuit with the electromagnet system switched on, they were caused by the short-circuit current forces Opening movement of the Limit the contact bridge so that the contact spring is not compressed to its block dimension B.

Eine weiterhin vorteilhafte Ausgestaltung besteht, wenn folgende Bedingung erfüllt ist:A further advantageous embodiment exists if the following condition is met:

C - (D + Ö + A) > BC - (D + Ö + A)> B

Ein Ausführungsbeispiel der Erfindung wird im folgenden an- hand einer Zeichnung näher erläutert. Es zeigen:An embodiment of the invention is explained in more detail below with reference to a drawing. Show it:

FIG 1 ein Kontaktsystem eines elektromagnetischen Schaltge¬ räts im AUS-Zustand,1 shows a contact system of an electromagnetic switching device in the OFF state,

FIG 2 das Kontaktsystem gemäß FIG 1 im EIN-Zustand und FIG 3 das Kontaktsystem gemäß FIG 2 im EIN-Zustand bei Auftritt eines Kurzschlußstromes.2 shows the contact system according to FIG. 1 in the ON state and FIG. 3 shows the contact system according to FIG. 2 in the ON state when a short-circuit current occurs.

In FIG 1 ist ein Kontaktsystem eines elektromagnetischen Schaltgeräts dargestellt. Es ist in einer hier nicht näher dargestellten Lichtbogenkammer mit Löschblechen 1 unterge¬ bracht und im wesentlichen aus Festkontakten 2, beweglichen Kontakten 3 an einer Kontaktbrücke 4, einem Kontaktträger 5 mit einem Fenster 6 und einer Kontaktfeder 7 zusammengesetzt. Im vorliegenden AUS-Zustand des Elektromagnetsystems drückt die Kontaktfeder 7 die Kontaktbrücke 4 auf den unteren Rand des Fensters 6 und hat dabei ein Einbaumaß der Länge C. Die beweglichen Kontakte 3 sind im Abstand Ö von den Festkontak¬ ten 2 gelegen. Auf der den Festkontakten 2 abgewandten Seite der Kontaktbrücke 4 sind im Abstand A zu dieser Anschläge 8 vorgesehen, die mit der Lichtbogenkammer vorteilhafterweise fest verbunden, z.B. an dieser angeformt sind.1 shows a contact system of an electromagnetic switching device. It is accommodated in an arc chamber (not shown here in more detail) with extinguishing plates 1 and is composed essentially of fixed contacts 2, movable contacts 3 on a contact bridge 4, a contact carrier 5 with a window 6 and a contact spring 7. In the present OFF state of the electromagnetic system, the contact spring 7 presses the contact bridge 4 onto the lower edge of the window 6 and has an installation dimension of length C. The movable contacts 3 are located at a distance Ö from the fixed contacts 2. On the side of the contact bridge 4 facing away from the fixed contacts 2, stops 8 are provided at a distance A from the latter, which are advantageously firmly connected to the arc chamber, e.g. are molded onto this.

FIG 2 zeigt das Kontaktsystem im EIN-Zustand. Der Kontaktträ¬ ger 5 ist durch den hier nicht dargestellten Magnetanker um den Weg D + Ö gegenüber dem EIN-Zustand nach unten bewegt, wobei mit D der Durchdruck der Kontaktfeder 7 im EIN-Zustand bezeichnet ist. Die Kontaktbrücke 4 hat in dieser Position den Abstand A + Ö von den Anschlägen 8.2 shows the contact system in the ON state. The contact carrier 5 is moved by the magnet armature (not shown here) down the path D + O with respect to the ON state, with D being the pressure of the contact spring 7 in the ON state is designated. In this position, the contact bridge 4 has the distance A + Ö from the stops 8.

In FIG 3 ist die Stellung des Kontaktsystems dargestellt, wenn im EIN-Zustand ein Kurzschluß auftritt und damit verbun¬ dene Kurzschlußstromkräfte auf die Kontaktbrücke 4 wirksam werden. Die Kontaktbrücke 4 bewegt sich aufgrund der Kurz- schlußstromkraft unter Öffnung der Kontakte 2,3 bis zum Auf¬ setzen an den Anschlägen 8 nach oben. Aufgrund dessen wird auf die Kontaktfeder 7 ein zusätzlicher Durchdruck wirksam, so daß die Feder auf die Länge E = C - (D + Ö + A) zusammen¬ gedrückt wird. Würde aufgrund der Stromkräfte die Kontakt- feder 7 auf das Blockmaß B zusammengedrückt werden, bevor die Kontaktbrücke 4 an den Anschlägen 8 festgehalten wird, blie- ben die Anschläge 8 wirkungslos, denn die Kontaktbrücke 4 würde den Kontaktträger 5 mit nach oben reißen. Um demzufolge mit den Anschlägen 8 die gewünschte Wirkung zu erzielen, muß folgende Bedingung eingehalten werden:3 shows the position of the contact system when a short circuit occurs in the ON state and associated short-circuit current forces act on the contact bridge 4. The contact bridge 4 moves upward due to the short-circuit current force with the opening of the contacts 2, 3 until they are placed on the stops 8. Because of this, an additional pressure is applied to the contact spring 7, so that the spring is compressed to the length E = C - (D + Ö + A). If, due to the current forces, the contact spring 7 were compressed to the block dimension B before the contact bridge 4 is held on the stops 8, the stops 8 would have no effect, since the contact bridge 4 would tear the contact carrier 5 upward. In order to achieve the desired effect with the stops 8, the following condition must be met:

C - (D + Ö + A) < BC - (D + Ö + A) <B

Erst bei Einhaltung dieser Voraussetzung wird verhindert, daß Kurzschlußstromkräfte auf den Kontaktträger 5 zerstörerisch einwirken.Only when this requirement is met is it prevented that short-circuit current forces have a destructive effect on the contact carrier 5.

Obwohl die vorliegende Erfindung unter Bezugnahme auf die in der beigefügten Zeichnung dargestellte Ausführungsform erläu¬ tert ist, sollte berücksichtigt werden, daß damit nicht beab¬ sichtigt ist, die Erfindung nur auf die dargestellte Ausfüh- rungsform zu beschränken, sondern alle möglichen Änderungen, Modifizierungen und äquivalente Anordnungen, soweit sie vom Inhalt der Patentansprüche gedeckt sind, einzuschließen. Although the present invention is explained with reference to the embodiment shown in the accompanying drawing, it should be borne in mind that it is not intended to limit the invention to the embodiment shown, but rather all possible changes, modifications and equivalent arrangements insofar as they are covered by the content of the claims.

Claims

Patentansprüche claims 1. Elektrisches Schaltgerät mit einem Elektromagnetsystem, mit einer Lichtbogenkammer, mit Festkontakten (2), mit einer Kontaktbrücke (4) mit beweglichen Kontakten (3) , mit einen Kontaktträger (5) mit einem Fenster (6), in dem die Kontakt¬ brücke (4) über eine Kontaktfeder (7) mit dem Einbaumaß (C) gehalten ist, wobei im AUS-Zustand des Elektromagnetsystems die Festkontakte (2) einen Abstand (Ö) von den beweglichen Kontakten (3) aufweisen und wobei im EIN-Zustand des Elektro¬ magnetsystems die Kontaktfeder (7) einen Durchdruck (D) er¬ fährt, so daß der Kontaktträger (4) zwischen dem EIN- und AUS-Zustand und umkehrt den Weg D + Ö zurücklegt, d a d u r c h g e k e n n z e i c h n e t , daß an der den Festkontakten (2) der Kontaktbrücke (4) abgewandten Seite Anschläge (8) an der Lichtbogenkammer vorgesehen sind, die von der Kontaktbrücke (4) im AUS-Zustand einen solchen Ab¬ stand (A) aufweisen, daß sie im Kurzschlußfall bei einge¬ schaltetem Elektromagnetsystem die durch die Kurzschlußstrom- kräfte bedingte Öffnungsbewegung der Kontaktbrücken (4) der¬ art begrenzen, daß die Kontaktfeder (7) dabei nicht auf ihr Blockmaß (B) zusammengedrückt wird.1. Electrical switching device with an electromagnetic system, with an arcing chamber, with fixed contacts (2), with a contact bridge (4) with movable contacts (3), with a contact carrier (5) with a window (6) in which the contact bridge (4) is held by a contact spring (7) with the installation dimension (C), the fixed contacts (2) being at a distance (Ö) from the movable contacts (3) in the OFF state of the electromagnet system and being in the ON state of the Electro magnetic system, the contact spring (7) travels through (D) so that the contact carrier (4) travels between the ON and OFF state and reverses the distance D + Ö, characterized in that the fixed contacts (2 ) of the contact bridge (4) facing away from stops (8) are provided on the arc chamber, which have such a distance (A) from the contact bridge (4) in the OFF state that they are in the event of a short circuit when the electromagnetic system is switched on limit the opening movement of the contact bridges (4) caused by the short-circuit current forces such that the contact spring (7) is not compressed to its block dimension (B). 2. Elektrisches Schaltgerät nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß folgende Bedingung er¬ füllt ist: C - (D + Ö + A) < B. 2. Electrical switching device according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the following condition is met: C - (D + Ö + A) <B.
EP97901046A 1996-01-22 1997-01-16 Electrical switching device Expired - Lifetime EP0876675B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97901046A EP0876675B1 (en) 1996-01-22 1997-01-16 Electrical switching device

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE19602118 1996-01-22
DE19602118A DE19602118C2 (en) 1996-01-22 1996-01-22 Electrical switching device
EP96112126 1996-07-26
EP96112126 1996-07-26
PCT/EP1997/000182 WO1997027605A1 (en) 1996-01-22 1997-01-16 Electrical switching device
EP97901046A EP0876675B1 (en) 1996-01-22 1997-01-16 Electrical switching device

Publications (2)

Publication Number Publication Date
EP0876675A1 true EP0876675A1 (en) 1998-11-11
EP0876675B1 EP0876675B1 (en) 1999-07-28

Family

ID=26022235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97901046A Expired - Lifetime EP0876675B1 (en) 1996-01-22 1997-01-16 Electrical switching device

Country Status (5)

Country Link
US (1) US6054911A (en)
EP (1) EP0876675B1 (en)
CN (1) CN1068452C (en)
DE (1) DE59700289D1 (en)
WO (1) WO1997027605A1 (en)

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Publication number Priority date Publication date Assignee Title
JP4395023B2 (en) * 2003-11-04 2010-01-06 三菱電機株式会社 Circuit breaker
US7839642B2 (en) 2008-04-04 2010-11-23 Liebert Corporation Heat-sink brace for fault-force support
CN101789332B (en) * 2010-02-10 2012-10-31 湖北盛佳电器设备有限公司 AC contactor with mechanical short-circuit self-locking function
FR2974660B1 (en) * 2011-04-27 2018-05-25 Legrand France ELECTRIC CONTACT DEVICE WITH HIGH PERFORMANCE CUT
CN103177884B (en) * 2011-12-26 2016-09-14 上海电科电器科技有限公司 The structure of contact terminal of low-voltage electrical apparatus
JP6064223B2 (en) * 2012-12-28 2017-01-25 パナソニックＩｐマネジメント株式会社 Contact device and electromagnetic relay equipped with the contact device
CN105793985B (en) * 2013-12-17 2019-02-12 西门子公司 Electronic Protection Modules for HVDC Converters
CN111883384A (en) * 2020-08-31 2020-11-03 四川艾贝斯科技发展有限公司 Single control multi-function vacuum circuit breaker
CN111900030A (en) * 2020-08-31 2020-11-06 四川艾贝斯科技发展有限公司 Vacuum switch actuator for vacuum circuit breaker
CN111883383A (en) * 2020-08-31 2020-11-03 四川艾贝斯科技发展有限公司 Multifunctional vacuum circuit breaker with multi-channel synchronous control

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FR2454174A1 (en) * 1979-04-09 1980-11-07 Merlin Gerin CONTACTOR WITH FAST OPENING FAULT CONTROL
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Title
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Also Published As

Publication number Publication date
WO1997027605A1 (en) 1997-07-31
US6054911A (en) 2000-04-25
EP0876675B1 (en) 1999-07-28
DE59700289D1 (en) 1999-09-02
CN1205111A (en) 1999-01-13
CN1068452C (en) 2001-07-11

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