EP0646938A1 - Schutzschalter mit verbesserte Lichtbogenkammer - Google Patents

Schutzschalter mit verbesserte Lichtbogenkammer Download PDF

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Publication number
EP0646938A1
EP0646938A1 EP94410082A EP94410082A EP0646938A1 EP 0646938 A1 EP0646938 A1 EP 0646938A1 EP 94410082 A EP94410082 A EP 94410082A EP 94410082 A EP94410082 A EP 94410082A EP 0646938 A1 EP0646938 A1 EP 0646938A1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
arc
separators
breaker according
contact
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.)
Ceased
Application number
EP94410082A
Other languages
English (en)
French (fr)
Inventor
Isabelle Leclercq
Pierre Leclercq
Pascale Petit
Jean Turc
Georges Bernard
Christian Fievet
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
Original Assignee
Schneider Electric SE
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
Application filed by Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0646938A1 publication Critical patent/EP0646938A1/de
Ceased legal-status Critical Current

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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
    • H01H9/36—Metal parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker

Definitions

  • Electric circuit breaker having a fixed contact, a movable contact actuated by a control mechanism between a closed position in which the movable contact is in engagement with the fixed contact, and an open position after separation of said contacts for interrupting the current passing through the circuit breaker , a pair of current supply conductors, and at least one arc extinguishing chamber arranged in the vicinity of the contacts to cool and interrupt the arc during the phase of separation of said contacts, said chamber comprising a stack of separators of deionization fitted with inverted U-shaped slots, the fixed contact being housed inside the arc extinguishing chamber, and cooperating with the contact part of the movable contact movable in the arc-forming volume formed by the narrow slits of successive separators.
  • the arc only fits correctly between the separators for relatively low currents. Above a certain intensity, it remains in the arc-forming chamber, or only partially enters the extinguishing chamber because of the plugging effect due to the high pressure.
  • the arc nevertheless manages to cool by a combined effect of convection, conduction in contact with the edge of the separators, and also of radiation.
  • the insertion of the arc becomes possible when the diameter of the arc decreases, which occurs when the current begins to decrease after limitation. Such a device delays the moment of extinction of the arc.
  • the object of the invention is to limit the pressure generated in an arc extinguishing chamber of a circuit breaker and to improve breaking independently of the value of the short-circuit current.
  • the circuit breaker according to the invention is characterized in that the lateral walls for confining the slots surround the movable contact, which is arranged on edge, with little play, that the end of the movable contact piece travels a path close to the bottom of the slots, always remaining inside the chamber, and that the volume V2 occupied by the chamber is greater than the volume V1 remaining free inside the pole.
  • the arrangement of the arc formation zone in the confinement volume of the slits of the sheets of the extinguishing chamber reduces the development of the arc to a minimum trajectory which contributes to an early cooling of the arc. This results in a significant reduction in the volume of gas which maintains the internal pressure at a moderate value, even in the presence of a high short-circuit current.
  • the arc quickly penetrates into the interstices of the different sheets, splitting into several short arcs. The rapid increase in the arc voltage is then favorable for rapid extinction of the arc, whatever the value of the current to be interrupted.
  • Figure 1 is a schematic sectional view of a circuit breaker pole equipped with arc extinguishing chambers according to the invention.
  • Figure 2 is a sectional view along line 2-2 of Figure 1.
  • Figure 3 shows a variant of Figure 2.
  • FIG. 4 is a side view of FIG. 3.
  • a pole 10 of an electrical circuit breaker with molded insulating housing 12 comprises a movable contact 14 in the form of a bridge carried by a switching bar 16 of insulating material.
  • the movable contact bridge 14 is provided with two contact parts 14a, 14b cooperating on one side with a first fixed contact 18, and on the opposite side with a second fixed contact 20.
  • the contact bridge 14 is mounted floating on the bar 16 by means of two springs 22, 24 of contact pressure.
  • the first fixed contact 18 is connected to a range 26 of current supply
  • the second fixed contact 20 is connected to another range 28 of current supply, which is diametrically opposite with respect to the axis 30 of rotation of the bar 16.
  • each pair of contacts 14a, 18; 14b, 20 of the pole 10 is associated with an arc extinguishing chamber 32 formed by a stack of separators or deionization plates 34, extending substantially parallel to one another, being separated by regular intervals.
  • Each sheet 34 is made of ferromagnetic steel, in particular based on iron-tungsten, and is shaped into a quadrangular plate, equipped with a central slot 36 in a U shape (FIG. 2), adapted to the passage of the movable contact 14.
  • the presence of the parallel sheets 14 in the chamber 32 increases the exchange surface between the hot gases and the metal, followed by the splitting of the arc into a plurality of partial arcs hung between the successive sheets 34. n results in an increase in the arc voltage, and a rapid extinction of the arc.
  • volume V1 formed between each chamber 32 and the switching bar 16 is less than the volume V2 occupied by said chamber 32.
  • Such an architecture of the pole 10 with a minimum of free volumes, is suitable for the permanent maintenance of the arc in chamber 32. This results in effective cooling of the arc, combined with moderate internal pressure.
  • FIG. 2 it can be seen that the fixed contact 18 is housed inside the extinguishing chamber 32, and that the movement of the contact piece 14a of the movable contact 14 in the slots 36 of the sheets 34 takes place with a small clearance.
  • the end of the contact piece 14a moves opposite the bottom 38 of the slot 36 of each sheet 34, and the side walls 40, 42 of the narrow slot 36 substantially match the shape of the movable contact 14
  • Such penetration of the movable contact 14 into the slots 36 of the sheets 34 makes it possible to obtain the birth of the arc directly inside the chamber 32.
  • the initial arc develops in the volume of the slots 36, and s 'hooks quickly on the sheets 34 by splitting into several short arcs.
  • the early cooling of the arc restricts the volume occupied by the latter in the extinguishing chamber 32, and thereby maintains the pressure at a moderate value, even in the presence of a short-circuit current.
  • the movable contact 14 is arranged on the edge, and during its movement, it always remains inside the chamber 32 without leaving the slots 36.
  • the current supply range 26, 28 serving as a support for the associated fixed contact 18, 20 is advantageously shaped as a half-loop promoting the rapid development of the arc towards the sheets 34.
  • the sheets 134 of the arc extinguishing chamber 132 also have narrow slots 136 in the shape of a U with side walls 140, 142, but the thickness of the two side branches 140a, 142a disposed on either side of the slots 136 is greater than that of the common posterior portion 143.
  • the arc is quickly inserted by magnetic attraction into the interstices 145, 146, 147 formed between the posterior parts 143 of the successive sheets 134.
  • Each interval between the sheets 134 at the level of the front part of the branches 140a, 142a has a thickness substantially equal to half the thickness of the interstices 145, 146, 147.
  • Such an extinction chamber 132 makes it possible to obtain a cutoff arc fast.
  • the sheets can also be replaced by separators made of porous refractory material, or by blocks of agglomerated metal balls.
EP94410082A 1993-10-05 1994-09-26 Schutzschalter mit verbesserte Lichtbogenkammer Ceased EP0646938A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9311939 1993-10-05
FR9311939A FR2711012B1 (fr) 1993-10-05 1993-10-05 Disjoncteur à chambre d'extinction d'arc perfectionnée.

Publications (1)

Publication Number Publication Date
EP0646938A1 true EP0646938A1 (de) 1995-04-05

Family

ID=9451612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94410082A Ceased EP0646938A1 (de) 1993-10-05 1994-09-26 Schutzschalter mit verbesserte Lichtbogenkammer

Country Status (2)

Country Link
EP (1) EP0646938A1 (de)
FR (1) FR2711012B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002041439A1 (de) * 2000-11-16 2002-05-23 Moeller Gmbh Kontaktanordnung für strombegrenzende schutzschalter
WO2008071320A2 (de) 2006-12-14 2008-06-19 Ids-Technology Gmbh Elektrischer schalter mit verdrehbar gelagertem kontaktelement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1446692A (fr) * 1964-11-23 1966-07-22 Stotzkontakt G M B H Chambre d'extinction des arcs, en particulier avec tôles de désionisation
FR2133596A1 (de) * 1971-04-01 1972-12-01 Westinghouse Electric Corp
US3801760A (en) * 1972-08-23 1974-04-02 Gen Electric Electric circuit breaker or the magnetic blowout type
EP0018454A1 (de) * 1977-10-04 1980-11-12 Dorman Smith Switchgear Limited Elektrischer Schalter
EP0174904A1 (de) * 1984-08-23 1986-03-19 Siemens Aktiengesellschaft Kontaktanordnung für Niederspannungs-Leistungsschalter mit einem zweiarmigen Kontakthebel
DE8807222U1 (de) * 1988-06-03 1989-10-05 Kloeckner-Moeller Elektrizitaetsgesellschaft Mbh, 5300 Bonn, De

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1446692A (fr) * 1964-11-23 1966-07-22 Stotzkontakt G M B H Chambre d'extinction des arcs, en particulier avec tôles de désionisation
FR2133596A1 (de) * 1971-04-01 1972-12-01 Westinghouse Electric Corp
US3801760A (en) * 1972-08-23 1974-04-02 Gen Electric Electric circuit breaker or the magnetic blowout type
EP0018454A1 (de) * 1977-10-04 1980-11-12 Dorman Smith Switchgear Limited Elektrischer Schalter
EP0174904A1 (de) * 1984-08-23 1986-03-19 Siemens Aktiengesellschaft Kontaktanordnung für Niederspannungs-Leistungsschalter mit einem zweiarmigen Kontakthebel
DE8807222U1 (de) * 1988-06-03 1989-10-05 Kloeckner-Moeller Elektrizitaetsgesellschaft Mbh, 5300 Bonn, De

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002041439A1 (de) * 2000-11-16 2002-05-23 Moeller Gmbh Kontaktanordnung für strombegrenzende schutzschalter
WO2008071320A2 (de) 2006-12-14 2008-06-19 Ids-Technology Gmbh Elektrischer schalter mit verdrehbar gelagertem kontaktelement
WO2008071320A3 (de) * 2006-12-14 2008-09-25 Viktor Kruetten Elektrischer schalter mit verdrehbar gelagertem kontaktelement
RU2444080C2 (ru) * 2006-12-14 2012-02-27 АйДиЭс-ТЕКНОЛОДЖИ ГМБХ Электрический выключатель с установленным с возможностью вращения контактным элементом
CN101595544B (zh) * 2006-12-14 2013-07-24 Ids技术有限公司 具有可旋转地支承的触点部件的电气开关
US8592707B2 (en) 2006-12-14 2013-11-26 Ids-Technology Gmbh Electrical switch with a contact element mounted such that it can rotate

Also Published As

Publication number Publication date
FR2711012B1 (fr) 1995-11-24
FR2711012A1 (fr) 1995-04-14

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