EP1998349B1 - Leistungsschalter mit hoher Ausschaltleistung - Google Patents

Leistungsschalter mit hoher Ausschaltleistung Download PDF

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Publication number
EP1998349B1
EP1998349B1 EP07425330A EP07425330A EP1998349B1 EP 1998349 B1 EP1998349 B1 EP 1998349B1 EP 07425330 A EP07425330 A EP 07425330A EP 07425330 A EP07425330 A EP 07425330A EP 1998349 B1 EP1998349 B1 EP 1998349B1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
contact
plate
fixed
base
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.)
Active
Application number
EP07425330A
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English (en)
French (fr)
Other versions
EP1998349A1 (de
Inventor
Fabrizio Fabrizi
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.)
BTicino SpA
Original Assignee
BTicino SpA
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.)
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Publication date
Application filed by BTicino SpA filed Critical BTicino SpA
Priority to ES07425330T priority Critical patent/ES2391200T3/es
Priority to EP07425330A priority patent/EP1998349B1/de
Priority to PL07425330T priority patent/PL1998349T3/pl
Publication of EP1998349A1 publication Critical patent/EP1998349A1/de
Application granted granted Critical
Publication of EP1998349B1 publication Critical patent/EP1998349B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/346—Details concerning the arc formation chamber
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/36—Metal parts

Definitions

  • the present invention relates to the field of circuit breakers and in particular to a high breaking capacity circuit breaker.
  • a circuit breaker as defined in the preamble of claim 1 is already known from US 5 548 258 .
  • a circuit breaker as a so called moulded case circuit breaker, comprises an electric circuit formed by a fixed electric contact and a movable electric contact.
  • the fixed electric contact is integral with the circuit breaker body whereas the movable contact is rotatably hinged to the circuit breaker body, in order to be moved from an open to a closed position.
  • the open position the movable electric contact is spaced apart from the fixed electric contact and the electric circuit of the circuit breaker is open.
  • the closed position the movable electric contact abuts against the fixed contact and the electric circuit is closed.
  • the circuit breaker In order to extinguish electric arcs formed during the opening/closing operations of the electric circuit, the circuit breaker is typically provided with a deionizing cell, which is positioned near the electric fixed and movable contacts.
  • the fixed contact, the end portion of the movable contact which interacts with the fixed contact and the deionizing cell are contained inside an internal chamber of the circuit breaker called deionizing chamber.
  • a characteristic parameter of a circuit breaker is the so-called breaking capacity, which may be defined as the maximum short-circuit current which may be interrupted by the circuit breaker.
  • the current corresponding to the maximum breaking capacity is much higher (some orders of magnitude) with respect to the maximum nominal current of the circuit breaker.
  • the latter is another characteristic property which may be defined as the maximum current the circuit breaker is able to withstand for an unlimited amount of time.
  • the breaking capacity of a circuit breaker is a parameter which depends on the constructive characteristics of the same circuit breaker, as for example the circuit breaker size and the dielectric properties of the medium interposed between the movable and the fixed contact.
  • the object of the present invention is to provide a circuit breaker having a breaking capacity higher than that of circuit breakers of the known art.
  • circuit breaker 1 With reference to fig. 1 , a particularly preferred illustrative and non limiting embodiment of the circuit breaker according to the invention, is generally indicated by numeral 1.
  • the circuit breaker 1 is for example a so called moulded case circuit breaker.
  • a moulded case circuit breaker as opposed to a so called air circuit breaker, has a cased body 2 formed by insulating material, for holding the internal circuit breaker mechanism.
  • Moulded case circuit breakers are generally used in automation industry as well as in the service and maintenance sector, for interrupting currents up to 1500 A.
  • the circuit breaker 1 is embodied in a non limiting way by a moulded case automatic three-pole circuit breaker.
  • the cased body 2 is formed by juxtaposing two shells, in particular a base shell, or base 3, and a lid shell, or lid 4.
  • Such shells 3, 4 are juxtaposed and mutually fixed by fixing means, not shown in the figures, such as rivets, screws or bolts.
  • a front overhanging portion is provided, commonly called “DIN front”, which is provided with a lever for operating circuit breaker 1, not shown.
  • the cased body 2 of the circuit breaker is provided on the upper side 6 with three screw clamps 7, or input terminals 7, for connecting the circuit breaker 1 to electric mains cables. Analogous clamps, or output terminals, not shown, are provided on the lower side of cased body 2.
  • the rear side 8 of cased body 2 is provided with suitable fixing means 9 for attaching the circuit breaker 1 to an electric panel.
  • suitable fixing means 9 allow to fix the circuit breaker 1 to a DIN rail by using a mounting device as the one described in Italian patent application nr. RM 2006 A 000145 .
  • openings 10 are provided for allowing the insertion, from the outside and from the rear side 8 of the circuit breaker 1, of the holding elements 20 for the fixed electric contacts of circuit breaker 1.
  • the circuit breaker 1 is a three-pole circuit breaker, its rear side 8 is provided with three openings 10, each allowing the insertion of a respective holding element, or contact-holder 20, provided with a fixed electric contact.
  • the contact holders 20 are comprised of copper or a copper alloy, for instance a copper and brass alloy.
  • fixing means as for instance holes for corresponding screws 22, rivets or analogous fixing means are provided on the rear side 8 of circuit breaker 1, and on holding element 20 at least a hole 21 is provided, which cooperates with such fixing means.
  • each of the contact holders 20 has a stepped end, provided with a hole 23 for receiving a corresponding screw, or a pin, of a connection screw terminal 7.
  • the circuit breaker 1 is of the three-pole type, it is provided with three separate electric circuits to be operated simultaneously by a single lever. Each of these circuits is provided in order to interrupt a respective phase and comprises a pair of contacts, i.e. a fixed and a movable electric contact.
  • a portion of the electric circuit of the circuit breaker 2 is illustrated in fig. 2 , which shows a fixed electric contact 25 and a movable electric contact 24. These contacts are preferably copper contacts.
  • the fixed electric contact 25 is connected, for instance by welding or riveting, to the respective contact holder 20, already described with reference to fig. 1 .
  • the movable electric contact 24 is fixed, for instance by welding or riveting, to a holding arm 26, which is rotatable about axis R-R. In this way, the movable electric contact 24 is rotatable in either direction along an arched trajectory T, defined between a first operating position, in which the movable contact 24 abuts against the fixed contact 25 and a second operating position, in which the movable contact 24 is positioned at a predetermined distance from the fixed electric contact 25.
  • the first operating position corresponds to a closed circuit condition
  • the second operating position illustrated in fig. 2
  • a circuit breaker 1 further comprises two generally plate-like parallel elements 27, 28, made of ferromagnetic material, preferably iron with a relative permeability of approximately 10.000. These elements are distanced from each other near the fixed and movable contacts 24, 25, and are opposed to each other with respect to a plane comprising the trajectory T of movable contact 24.
  • plate-like elements 28, 28 extend approximately starting from the fixed contact 25 to such an extent that at least a significant portion of trajectory T lies between these elements 27, 28.
  • the significant portion corresponds at least to 50% of the total length of trajectory T. More preferably, this significant portion corresponds to at least 70% of the total length of said trajectory T.
  • the two plate-like elements 27, 28 are portions of an integral ferromagnetic piece, further comprising a crossbar 29 connected to a respective end portion of each of plate-like elements 27, 28.
  • this integral element which from now on will be called ferromagnetic element, is generally "C” or "U” shaped.
  • the crossbar 29 of ferromagnetic element 27, 28, 29 is positioned underneath the fixed electric contact 25.
  • the contact holder 20 is provided with a hook-shaped end portion, comprising a plate 31, on which the fixed contact 25 is fixed, wherein the crossbar 29 is positioned under said plate 31, and is interposed between the plate 31 and the remaining portion of contact holder 20.
  • the ferromagnetic component 27, 28, 29 has also the task to fix the fixed contact 25 and its holder 20 to the base 3 of circuit breaker 1.
  • each of the two plate-like elements 27, 28 is provided, at its distal end, with respect to the fixed contact 25, with fixing means 32 in order to fix the ferromagnetic element 28, 29, 29 to the base 3 of circuit breaker 1.
  • these fixing means are formed by a pair of pins 32, wherein each pair has a plate-like element 27, 28 positioned on a respective end. The fixing procedure by means of pairs of pins 32 will be further explained in the following description.
  • Fig. 3 shows a portion of the circuit breaker of fig. 1 , in which the base 3 of circuit breaker 1 is shown in a cross section A-A of fig. 1 .
  • the movable electric contact 24 is in the closed position, i.e. it abuts against the fixed contact 25.
  • This figure also shows the rotating mechanism 36 which acts on arm 26 holding the movable contact 24, in order to move it between its two operating positions.
  • Fig. 4 shows an internal view of a portion of base 3, wherein the rotating mechanism 36, the holding arm 26 and the movable contact 24 have been omitted.
  • the fixed contact 25 and the movable contact 24 are housed inside a chamber 35, usually called interruption chamber or deionizing chamber.
  • a chamber 35 usually called interruption chamber or deionizing chamber.
  • two lateral opposed walls 36, 37 of chamber 35 are provided with a respective wall portion 38, 39 projecting towards the inside of the interruption chamber 35 and provided with an internal cavity, which is best seen in fig. 3 , which is substantially isolated from the deionizing chamber 35 and receives a corresponding plate-like element 27, 28 of ferromagnetic element 27, 28, 29.
  • each of the two cavities is closed on the upper side by a transverse wall 40, in which an opening is provided, through which a pair of pins 32 is to be inserted.
  • the fixing of the ferromagnetic component 27, 28, 29 may for example be accomplished by means of metallic washers 33, in particular by inserting each pair of pins 32, after passing them through the openings provided on the transverse walls 40, into a respective washer 32, and then by parting the pins 32 of a same pair.
  • circuit breaker 1 of the example shown is a three-pole circuit breaker, in fig. 4 three adjacent deionizing chambers 35 are at least partially shown. In one of these, a so called deionizing cell 50 is shown. Obviously, the other two chambers 35 are also normally provided with a respective deionizing cell 50, although in fig. 4 they are shown without such a cell.
  • a particularly preferred embodiment of a deionizing cell 50 is shown in fig. 5 .
  • the cell 50 comprises a group of densely packed parallel thin plates 51, which are joined together by opposite lateral bars 52.
  • the thin plates 51 have an arched notch 53 in the portion directed towards the movable contact, so that a slot is defined inside the cell 50, which is generally parallel to trajectory T, and forms an invitation for the arc to be extinguished.

Landscapes

  • Breakers (AREA)

Claims (13)

  1. Schaltungsunterbrecher (1), der folgende Merkmale aufweist:
    eine elektrische Schaltung mit zumindest einem festen elektrischen Kontakt (25) und zumindest einem bewegbaren elektrischen Kontakt (24), wobei der bewegbare Kontakt (24) drehbar ist entlang einer Trajektorie (T), die in einer Ebene liegt und definiert ist zwischen einer ersten Betriebsposition, in der der bewegbare Kontakt (24) gegen den festen Kontakt (25) anstößt, und einer zweiten Betriebsposition, in der der bewegbare Kontakt (24) an einem vorbestimmten Abstand von dem festen Kontakt (25) positioniert ist, wobei der Schaltungsunterbrecher (1) ferner ein Halteelement (20) für den festen Kontakt (25) aufweist,
    zwei allgemein plattenartige parallele Elemente (27, 28), die aus ferromagnetischem Material hergestellt sind, die an einem bestimmten gegenseitigen Abstand auf gegenüberliegenden Seiten bezüglich der Ebene positioniert sind, wobei die Elemente (27, 28) Abschnitte einer einzelnen Komponente (27, 28, 29) sind, die aus ferromagnetischem Material hergestellt ist, die eine Kreuzschiene (19) aufweist, die mit einem jeweiligen Endabschnitt der plattenartigen Elemente (27, 28) verbunden ist,
    einen umhüllten Körper (2) mit einer Basis (3) aus isolierendem Material und einem Abdeckungsteil (4), der über die Basis (2) platziert werden kann, wobei die Komponente aus ferromagnetischem Material (27, 28, 29) ferner ein Befestigungselement bildet, um den festen Kontakt (25) an der Basis (3) zu befestigen,
    dadurch gekennzeichnet, dass
    die Komponente (27, 28, 29) und das Halteelement (20) mit der Basis (3) verbunden sind durch Einfügen derselben in die Basis (3) von der gegenüberliegenden Seite (8) der Basis (3) bezüglich des Abdeckungsteils (5).
  2. Schaltungsunterbrecher (1) gemäß Anspruch 1, bei dem die Länge der Elemente (27, 28) beginnend von dem festen Kontakt (25) derart ist, dass ein wesentlicher Abschnitt der Trajektorie (T) zwischen den Elementen (27, 28) angeordnet ist.
  3. Schaltungsunterbrecher (1) gemäß Anspruch 2, bei dem der wesentliche Abschnitt zumindest gleich 50 % der Gesamtlänge der Trajektorie (T) ist.
  4. Schaltungsunterbrecher (1) gemäß Anspruch 2, bei dem der Abschnitt zumindest gleich 75 % der Gesamtlänge der Trajektorie (T) ist.
  5. Schaltungsunterbrecher (1) gemäß Anspruch 1, bei dem die Komponente (27, 28, 29) im Wesentlichen "C"- oder "U"-förmig ist.
  6. Schaltungsunterbrecher (1) gemäß Anspruch 1, wobei die Kreuzschiene (29) unter dem festen elektrischen Kontakt (25) angeordnet ist.
  7. Schaltungsunterbrecher (1) gemäß Anspruch 6, bei dem das Halteelement (20) mit einem Hakenendabschnitt versehen ist, der eine Halteplatte (31) aufweist, an der der feste Kontakt (25) befestigt ist, wobei die Kreuzschiene (29) zwischen der Halteplatte (31) und einem gegenüberliegenden Abschnitt des Hakenendes positioniert ist.
  8. Schaltungsunterbrecher (1) gemäß Anspruch 7, bei dem die Kreuzschiene (29) in Kontakt mit der Halteplatte (31) ist.
  9. Schaltungsunterbrecher (1) gemäß Anspruch 1, bei dem die Basis eine Deionisierungskammer (35) aufweist, in der der elektrische feste (25) und bewegbare (24) Kontakt untergebracht sind, wobei die Kammer (35) zwischen zwei lateralen gegenüberliegenden Wänden (35, 37) bezüglich der Ebene definiert ist, wobei jede der Wände einen Hohlraum (38, 39) aufweist zum Aufnehmen eines jeweiligen der plattenartigen Elemente (27, 28).
  10. Schaltungsunterbrecher (1) gemäß Anspruch 1, bei dem jedes der plattenartigen Elemente (27, 28) einen Endabschnitt aufweist, der distal positioniert ist bezüglich der Kreuzschiene (29), und mit einer Einrichtung (32) versehen ist zum Befestigen der Komponente an der Basis.
  11. Schaltungsunterbrecher (1) gemäß Anspruch 10, bei dem die Einrichtung für jedes plattenartige Element (27, 28) ein Paar von parallelen Anschlussstiften (32) aufweist, die nach dem Einfügen des plattenartigen Elements in den jeweiligen Hohlraum (38, 39) getrennt werden können.
  12. Schaltungsunterbrecher (1) gemäß einem der vorhergehenden Ansprüche, wobei der Schaltungsunterbrecher ein automatischer Formgehäuseschaltungsunterbrecher ist.
  13. Schaltungsunterbrecher (1) gemäß Anspruch 12, bei dem der Schaltungsunterbrecher ein dreipoliger oder ein vierpoliger Schaltungsunterbrecher ist.
EP07425330A 2007-05-30 2007-05-30 Leistungsschalter mit hoher Ausschaltleistung Active EP1998349B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES07425330T ES2391200T3 (es) 2007-05-30 2007-05-30 Disyuntor de circuitos de alta capacidad de desconexión
EP07425330A EP1998349B1 (de) 2007-05-30 2007-05-30 Leistungsschalter mit hoher Ausschaltleistung
PL07425330T PL1998349T3 (pl) 2007-05-30 2007-05-30 Wyłącznik o dużej zdolności wyłączania

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07425330A EP1998349B1 (de) 2007-05-30 2007-05-30 Leistungsschalter mit hoher Ausschaltleistung

Publications (2)

Publication Number Publication Date
EP1998349A1 EP1998349A1 (de) 2008-12-03
EP1998349B1 true EP1998349B1 (de) 2012-07-11

Family

ID=38481399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07425330A Active EP1998349B1 (de) 2007-05-30 2007-05-30 Leistungsschalter mit hoher Ausschaltleistung

Country Status (3)

Country Link
EP (1) EP1998349B1 (de)
ES (1) ES2391200T3 (de)
PL (1) PL1998349T3 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7551050B2 (en) 2006-09-22 2009-06-23 Rockwell Automation Technologies, Inc. Contactor assembly with arc steering system
US7716816B2 (en) * 2006-09-22 2010-05-18 Rockwell Automation Technologies, Inc. Method of manufacturing a switch assembly
JP2011014246A (ja) * 2009-06-30 2011-01-20 Fuji Electric Fa Components & Systems Co Ltd 回路遮断器
WO2015090383A1 (de) * 2013-12-18 2015-06-25 Siemens Aktiengesellschaft Schaltgerät mit einem elektromagnetischen lichtbogenantrieb
CN105097333B (zh) * 2014-04-21 2018-01-16 西门子公司 切换装置的灭弧组件及其切换装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1104019B (de) * 1959-09-11 1961-04-06 Continental Elektro Ind Ag Lichtbogenloeschkammer fuer elektrische Leistungsschalter
JPH07296707A (ja) * 1994-04-26 1995-11-10 Fuji Electric Co Ltd 回路遮断器の磁気駆動鉄心絶縁装置
US5589672A (en) * 1994-06-14 1996-12-31 Fuji Electric Co., Ltd. Circuit breaker with arc quenching device and vent
DE202006005418U1 (de) * 2006-04-04 2006-06-08 Moeller Gmbh Elektrische Schaltkammer

Also Published As

Publication number Publication date
PL1998349T3 (pl) 2012-11-30
ES2391200T3 (es) 2012-11-22
EP1998349A1 (de) 2008-12-03

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