EP0243980A2 - Arrangement de contacts pour disjoncteurs de puissance à basse tension limitant le courant - Google Patents

Arrangement de contacts pour disjoncteurs de puissance à basse tension limitant le courant Download PDF

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Publication number
EP0243980A2
EP0243980A2 EP87106355A EP87106355A EP0243980A2 EP 0243980 A2 EP0243980 A2 EP 0243980A2 EP 87106355 A EP87106355 A EP 87106355A EP 87106355 A EP87106355 A EP 87106355A EP 0243980 A2 EP0243980 A2 EP 0243980A2
Authority
EP
European Patent Office
Prior art keywords
contact
arms
arrangement according
pieces
parts
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
EP87106355A
Other languages
German (de)
English (en)
Other versions
EP0243980B1 (fr
EP0243980A3 (en
Inventor
Josef Dipl.-Ing. Spindler
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to AT87106355T priority Critical patent/ATE78953T1/de
Publication of EP0243980A2 publication Critical patent/EP0243980A2/fr
Publication of EP0243980A3 publication Critical patent/EP0243980A3/de
Application granted granted Critical
Publication of EP0243980B1 publication Critical patent/EP0243980B1/fr
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
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement

Definitions

  • the invention relates to a contact arrangement according to the preamble of claim 1.
  • DE-AS 1 638 154 which describes a self-switch in which at least one movable contact arm is pivoted by the other contact arm under the influence of short-circuit currents and their electro-dynamic forces.
  • One end of a tension spring which can be moved via a dead center acts on the movable contact arm, while the other end is fastened to a pivotable auxiliary lever.
  • the contact arm also has a pin for driving the auxiliary lever, which engages in an L-shaped recess in the auxiliary lever.
  • the object of the invention is therefore to provide a contact arrangement in which the moments of inertia of the movable contact arms are reduced using technically simple means.
  • the contact arrangement according to the invention has a particular advantage of a faster rise in the arc voltage and a better current limitation. This results in a lower short-circuit stress on the system parts to be protected and the switch itself, which also leads to a smaller switch volume.
  • the above-mentioned proportional factor c contains the reciprocal of the mass m or the moment of inertia ⁇ .
  • the springs shown are compression springs, the function of which can optionally also be carried out by appropriately arranged leaf springs or torsion springs.
  • end sections 3, 4 of pivotable contact arms 5, which may also be contact arms of bridge contacts or of c-shaped fixed contacts 6, can thus be rotated close to contact piece 1, 2 to contact arm 5 , 6 attached that the mass moments of inertia of the end sections 3, 4 are as small as possible.
  • the end sections 3, 4 are supported at points 7, 8 in such a way that a rotary movement is only possible in the opening direction.
  • the end sections are held in their stretched normal position by springs 9, 10, the spring forces being matched so that their force is equal to or greater than the required contact force.
  • the smaller moments of inertia of the end sections 3, 4 are first accelerated and moved in the opening direction. Because of the small turning radius of the end sections 3, 4 compared to the larger radius of the pivotable contact arm 5, the end sections 3, 4 quickly form a relatively large angle to one another.
  • the perpendicular to the contact areas escaping plasma jets will facilitate the formation of the base in the direction of the desired arc movement when rotated prematurely on the counter contact piece and will finally be directed into the space which lies between the end sections and an arc quenching chamber (not shown).
  • the plasma rays contain almost no more neutral particles, but mainly electrons and ions, i.e. charge carriers, which prepare the arc column, as it were, the way from the contact space to the arc quenching chamber.
  • the contact arm 5 has also moved clearly upwards due to the repulsive current forces in the approximately parallel current paths of the contact arm 5 and the c-shaped fixed contact 6.
  • the further movement can, as with contact arrangements with rigid contact arms and rigid c-shaped fixed contacts expire.
  • the pivotable end sections 13, 14 with the contact pieces 1, 2 are designed as rockers, the pivot points 15 of which form the ends of the contact arm 5 and the c-shaped fixed contact 6.
  • the parts 18, 19 opposite the contact-carrying parts 16, 17 of the end sections 13, 14 are insulated from one another at least up to the pivot points 15 in such a way that arcing between them is made impossible because the parts 18, 19 are still relative even after the opening movement has started stay in touch for a long time or in closer proximity.
  • Springs 20, 21, which are supported on the one hand on the end sections 13, 14 and on the other hand on a spring bearing 22 of the movable contact arm 5 or on a spring bearing 23 fixed to the housing, are tuned so that the end sections 13, 14 are approximately also in the closed normal state the contact arm 5 or the upper part of the c-shaped fixed contact 6 are aligned.
  • the two described arrangements accelerate relatively small moments of inertia, particularly due to the current forces, and already in the initial phase of the contact opening a relatively large angle of the contact surfaces against one another, which favors the movement of the arc base points and the ionization of the space between contact pieces and arc quenching chambers by the plasma rays.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP87106355A 1986-05-02 1987-04-30 Arrangement de contacts pour disjoncteurs de puissance à basse tension limitant le courant Expired - Lifetime EP0243980B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87106355T ATE78953T1 (de) 1986-05-02 1987-04-30 Kontaktanordnung fuer strombegrenzende niederspannungs-leistungsschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614866 1986-05-02
DE19863614866 DE3614866A1 (de) 1986-05-02 1986-05-02 Kontaktanordnung fuer strombegrenzende niederspannungs-leistungsschalter

Publications (3)

Publication Number Publication Date
EP0243980A2 true EP0243980A2 (fr) 1987-11-04
EP0243980A3 EP0243980A3 (en) 1989-02-15
EP0243980B1 EP0243980B1 (fr) 1992-07-29

Family

ID=6300010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106355A Expired - Lifetime EP0243980B1 (fr) 1986-05-02 1987-04-30 Arrangement de contacts pour disjoncteurs de puissance à basse tension limitant le courant

Country Status (3)

Country Link
EP (1) EP0243980B1 (fr)
AT (1) ATE78953T1 (fr)
DE (2) DE3614866A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL142271B (nl) * 1967-01-27 1974-05-15 Terasaki Denki Sangyo Kk Automatische schakelinrichting met beweegbare contactstangen openend onder invloed van elektrodynamische krachten.
US3534305A (en) * 1968-11-21 1970-10-13 Ite Imperial Corp Current limiting circuit breaker
BE800292A (fr) * 1973-05-30 1973-11-30 Guschin Vladislav Y Disjoncteur.
DE2511948C3 (de) * 1975-03-19 1978-05-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Strombegrenzender Leistungsschalter
DD154561B1 (de) * 1980-11-17 1986-04-23 Wolfgang Pump Kontakteinrichtung für strombegrenzende Leitungsschutzschalter
IE56136B1 (en) * 1983-12-19 1991-04-24 Westinghouse Electric Corp Circuit breaker with improved cross-bar and contact assembly
DD225237A1 (de) * 1984-07-02 1985-07-24 Zeiss Jena Veb Carl Einrichtung zum abgleich des abbiildungsmassstabes

Also Published As

Publication number Publication date
ATE78953T1 (de) 1992-08-15
EP0243980B1 (fr) 1992-07-29
DE3780690D1 (de) 1992-09-03
DE3614866A1 (de) 1987-11-05
EP0243980A3 (en) 1989-02-15
DE3614866C2 (fr) 1989-04-06

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