EP0991093B1 - Verfahren und Vorrichtung zur elektrischen Stromabschaltung - Google Patents

Verfahren und Vorrichtung zur elektrischen Stromabschaltung Download PDF

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Publication number
EP0991093B1
EP0991093B1 EP19990402370 EP99402370A EP0991093B1 EP 0991093 B1 EP0991093 B1 EP 0991093B1 EP 19990402370 EP19990402370 EP 19990402370 EP 99402370 A EP99402370 A EP 99402370A EP 0991093 B1 EP0991093 B1 EP 0991093B1
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EP
European Patent Office
Prior art keywords
current
contacts
arc
contact
principal
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
EP19990402370
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English (en)
French (fr)
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EP0991093A1 (de
Inventor
Joel Devautour
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.)
Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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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

Definitions

  • the present invention relates to a method of blowing an electric arc of break occurring between separable contacts of an electrical appliance, these contacts being traversed in the closed state by a main current and giving birth, during an opening under tension, to an arc which extends between the parts of contact and / or adjacent conductive parts leading to an extinguishing chamber, the arc being directed at the start of opening in a main direction.
  • a cut-off device comprising at least one line current with conductive parts carrying separable contacts and connecting these contacts at connection terminals, and comprising an extinguishing chamber arc associated with separable contacts; the contacts are traversed in the closed state by a main current, while their opening under voltage gives rise to an arc which extends between the contacts and / or their supporting conductive parts and / or adjacent conductive rails leading to the extinguishing chamber.
  • conductive parts power supply of a particular shape for example in J
  • an additional magnetic field is created by means of a magnetic circuit with which a source of field such as a magnet.
  • Document GB-A-828,865 describes a method of blowing an electric arc according to the preamble of claim 1.
  • the object of the invention is to generate a high magnetic field for blowing the arc without requiring any complication of the conductive current supply parts
  • a transient current transverse to the main direction of the arc is injected into one of the contacts or one of the conductive parts, the injected transient current generating a field magnetic arc blowing device.
  • the current supply parts can be simplified, usually dimensioned to favor self-blowing of the arc, and therefore reduce their cost; that on the other hand we can improve the energy balance observed at the level contact electrodes.
  • the transverse transient current is injected in the form of a pulse. of high energy current from the birth of the arc, the start of the pulse being determined from the displacement of the mobile contact or from its cause, and the Magnetic blowing field created by the transverse transient current is added to the self-blowing magnetic field created by the main current.
  • the device of the invention is such that at least one of the conductive parts carrying the separable contacts is connected to a current source capable of injecting into the interruption of a transient current in the contact or in the conductive part which carries the contact or in an adjacent conductive part such as a guide rail of arc, the connections of the conductive part with the current source being suitable for establishing a direction for the transient current in the surface area flow transverse to the main direction.
  • FIG. 1 represents a cut-off device according to the invention at the start of opening with current injection at one of the contacts.
  • FIG. 2 shows a variant of the device with injection at the level of a rail provided for the displacement of a foot of arc.
  • the electrical device illustrated in FIG. 1 comprises separable contacts at 10.11 pads connected respectively to connection terminals 12.13 by conductive parts 14,15 which carry the pads and other conductive elements such as 16.17.
  • Contact pads 10,11 and conductive parts and elements define a current line traversed, when the contacts 10,11 are closed, by a main current of intensity I1. This current flows from a contact to the other in a direction X.
  • the contact 10 is fixed and the contact 11 is mobile and subject to an opening system 18 of all types.
  • An auxiliary current circuit 20, which includes a pulse current source 21, has conductive parts 22, 23 which are connected at 24 and 25 to the contact pad 10 or preferably to its carrier conductive part 14. More the points 22 and 23 are close to the surface 26 of the contact 10 cooperating with the surface 27 of contact 11, the greater the targeted effect.
  • the current source is shown subject to opening system 18, but can be ordered by any electrical, magnetic, mechanical device associated with the cause or effect of the opening phenomenon, so as to emit a transient current pulse I2 at the desired time to help extinguish the arc.
  • the target pulse is high frequency, i.e. it can be a single pulse with a steep edge or a train of high frequency pulses.
  • the opening system 18 When the opening system 18 causes the contact 11 to move, it separates from contact 10 and there appears between their surfaces an arc A.
  • the pulse of current 12 is emitted with a steep edge by the source 21 and passes into the skin of the contact 10 in a direction Y substantially transverse to the direction X.
  • the impulse transient current 12 generates a magnetic field B2 which exerts on the arc a force F2 causing a displacement of the arc A in the direction Y.
  • the arc is looped as indicated in A ', this which creates an additional magnetic field B1 helping to expel the arc in direction Y.
  • the current pulse I2 thus destabilizes the arc, which is therefore aware of the self-blowing produced by the main current I1.
  • the strong current densities produced have a thermal effect which helps drive out faster the arc.
  • the conductive parts 22, 23 may be rails provided to guide the foot corresponding from the arc to extinguishing chambers 28 for example provided fractionation fins.
  • FIG. 2 is shown an alternative embodiment of the device, implemented on rails 31, 32 for guiding the feet of the cutting arc A.
  • the circuit of auxiliary current 20 is connected at 24 and 25 to a rail 31 so that the current transient I2 can flow in direction Y which is that of rail 31, at less in the part of it on which it is desired to accentuate the effect of bow hunting.
  • the main current line is deflected when the contacts open 10.11 towards the rails, so that the main current I1 passes through the rail 32, the arc and rail 31.
  • the current pulse I2 is injected at a time chosen by a member trigger 33 and, in the direction Y, induces a magnetic field B2 which subjects the arc to an effort F2. This effort is added to the F1 effort due to the sulk main current I1 and the arc is driven more quickly towards the chamber extinction 28.
  • the electrical device described can be single or double cut and it is applicable in low, medium or high voltage.
  • High frequency current pulse is unique or can consist of a train of pulses.
  • the source of current is of any known type. Its energy can advantageously come from the main power line.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)

Claims (7)

  1. Verfahren zur Löschung eines Schaltlichtbogens, der zwischen trennbaren Kontakten eines elektrischen Gerätes erscheint, wobei diese Kontakte im geschlossenen Zustand von einem Hauptstrom (11) durchflossen werden und bei einer Öffnung unter Spannung die Entstehung eines Bogens bewirken, der sich zwischen den Kontaktteilen und/oder benachbarten Leiterteilen erstreckt, die zu einer Löschkammer führen, wobei der Bogen zu Beginn der Öffnung entsprechend einer Hauptrichtung geführt wird, dadurch gekennzeichnet, dass sofort bei der Öffnung der Kontakte ein Einschwingstrom (12), der transversal zur Hauptrichtung des Bogens ist, in einen der Kontakte oder in eines der Leiterteile injiziert wird, wobei der injizierte Einschwingstrom ein lokales magnetisches Feld zur Bogenlöschung erzeugt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der transversale Einschwingstrom (I2) in Form eines Stromimpulses mit hoher Energie injiziert wird, und dies sobald der Bogen entsteht, wobei der Beginn des Impulses anhand der Verschiebung des mobilen Kontaktes oder anhand seines Grunds bestimmt wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das magnetische Löschfeld, das vom transversalen Einschwingstrom (I2) erzeugt wird, zum magnetischen Feld der Selbstlöschung hinzukommt, das vom Hauptstrom (I1) erzeugt wird.
  4. Abschaltvorrichtung, die mindestens eine Stromleitung mit Leiterteilen aufweist, die trennbare Kontakte (10, 11) tragen und die diese Kontakte an Anschlussklemmen anschließen, und die eine Kammer zur Löschung des Bogens (28) aufweist, die den trennbaren Kontakten zugeordnet ist, wobei diese Kontakte im geschlossenen Zustand von einem Hauptstrom (11) durchflossen werden, während die Öffnung unter Spannung der Kontakte die Entstehung eines Bogens (A) bewirkt, der sich zwischen den Kontakten und/oder ihren tragenden Leiterteilen und/oder benachbarten Leiterteilen erstreckt, die zur Löschkammer führen, wobei der Bogen zu Beginn der Öffnung entsprechend einer Hauptrichtung (X) geführt wird, dadurch gekennzeichnet, dass mindestens eines von den Leiterteilen (10, 11, 14, 15) an eine Stromquelle (21) angeschlossen ist, die fähig ist, bei der Abschaltung einen Einschwingstrom (I2) zu injizieren, und dies in einem Bereich unweit von der Oberfläche des Kontaktes (10, 11) oder des Leiterteils (14, 15), der ihn trägt, oder des benachbarten Leiterteils, wobei die Verbindungen des Leiterteils mit der Stromquelle geeignet ist, für den Einschwingstrom im Bereich der Oberfläche eine Richtung (Y) zu erzeugen, die transversal zu der Hauptrichtung (X) ist.
  5. Abschaltvorrichtung, die mindestens eine Stromleitung mit Leiterteilen aufweist, die trennbare Kontakte (10, 11) tragen und die diese Kontakte an Anschlussklemmen anschließen, und die eine Kammer zur Löschung des Bogens (28) aufweist, die den trennbaren Kontakten zugeordnet ist, wobei diese Kontakte im geschlossenen Zustand von einem Hauptstrom (I1) durchflossen werden, während die Öffnung unter Spannung der Kontakte die Entstehung eines Bogens (A) bewirkt, der sich zwischen den Kontakten (10, 11) und/oder den benachbarten Leiterschienen (31, 32) erstreckt, die zur Löschkammer führen, um sich zwischen den Schienen entsprechend einer Hauptrichtung (X) zu erstrecken, dadurch gekennzeichnet, dass mindestens eine von den Schienen (31, 32) an eine Stromquelle (21) angeschlossen ist, die fähig ist, bei der Abschaltung einen Einschwingstrom (I2) herzustellen, wobei die Verbindungen der Schiene mit der Stromquelle derart sind, dass der Einschwingstrom der Schiene entlang geleitet wird, um ein magnetisches Feld zu erzeugen, das dazu tendiert, den Bogen zur Abschaltkammer zu vertreiben.
  6. Abschaltvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass der Einschwingstrom in der Schiene zum Hauptstrom hinzukommt.
  7. Abschaltvorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Stromquelle (21) impulsartig ist und dass die Vorrichtung ein Organ zur Auslösung des Impulses (18, 33) aufweist, das in Abhängigkeit von der Überschreitung eines mechanischen oder elektrischen Wertes gesteuert wird, der der Öffnung von den Kontakten (10, 11) zugeordnet ist.
EP19990402370 1998-10-01 1999-09-28 Verfahren und Vorrichtung zur elektrischen Stromabschaltung Expired - Lifetime EP0991093B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9812336 1998-10-01
FR9812336A FR2784223B1 (fr) 1998-10-01 1998-10-01 Procede et dispositif de coupure de courant electrique

Publications (2)

Publication Number Publication Date
EP0991093A1 EP0991093A1 (de) 2000-04-05
EP0991093B1 true EP0991093B1 (de) 2004-03-24

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Application Number Title Priority Date Filing Date
EP19990402370 Expired - Lifetime EP0991093B1 (de) 1998-10-01 1999-09-28 Verfahren und Vorrichtung zur elektrischen Stromabschaltung

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EP (1) EP0991093B1 (de)
DE (1) DE69915756T2 (de)
FR (1) FR2784223B1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB828865A (en) * 1957-04-09 1960-02-24 Alfred Vang Electric circuits for preventing or minimizing arcing at circuit-breaker or switch contacts
FR2438905A1 (fr) * 1978-10-12 1980-05-09 Alsthom Cgee Dispositif de coupure de courant a haute tension
US4924750A (en) * 1988-12-23 1990-05-15 General Electric Company Electromagnetic launcher with improved current commutating switch performance

Also Published As

Publication number Publication date
EP0991093A1 (de) 2000-04-05
FR2784223B1 (fr) 2000-12-01
DE69915756D1 (de) 2004-04-29
FR2784223A1 (fr) 2000-04-07
DE69915756T2 (de) 2004-08-12

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