EP0243980B1 - Kontaktanordnung für strombegrenzende Niederspannungs-Leistungsschalter - Google Patents

Kontaktanordnung für strombegrenzende Niederspannungs-Leistungsschalter Download PDF

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Publication number
EP0243980B1
EP0243980B1 EP87106355A EP87106355A EP0243980B1 EP 0243980 B1 EP0243980 B1 EP 0243980B1 EP 87106355 A EP87106355 A EP 87106355A EP 87106355 A EP87106355 A EP 87106355A EP 0243980 B1 EP0243980 B1 EP 0243980B1
Authority
EP
European Patent Office
Prior art keywords
contact
rockers
arms
opening
arrangement according
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
EP87106355A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0243980A3 (en
EP0243980A2 (de
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/de
Publication of EP0243980A3 publication Critical patent/EP0243980A3/de
Application granted granted Critical
Publication of EP0243980B1 publication Critical patent/EP0243980B1/de
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 circuit breaker 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 relatively slow start of contact opening has another consequence: Immediately after the contact separation, even with swiveling contacts, there is hardly any rotational movement; the contact surfaces move away, apparently parallel to each other and straight from each other.
  • the plasma jets emerging from the arc base have the tendency to be perpendicular to the contact surfaces from which they emerge.
  • the tips of the plasma rays, which generate new arc base points on the opposite contact surface and could thus initiate a base point movement strike the counter contact surface only in a relatively narrowly limited area around the respective opposite arc base point.
  • the base points therefore move in a very small space; a movement in the desired direction towards the drain edge or towards the drain horn cannot be achieved with small contact openings.
  • 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. As a result, there is less short-circuit stress on the system parts to be protected and achieved by the switch itself, which also leads to a smaller switching volume.
  • the above-mentioned proportional factor c contains the reciprocal of the moment of inertia ⁇ .
  • K is a new proportionality factor for the current square force conversion.
  • the rotational acceleration changes inversely proportional to the mass moments of inertia of the moving contact parts. The smaller these mass moments of inertia, the greater the acceleration at given current forces. The current forces that are still effective at the moment of the contact separation can accelerate the smaller moments of inertia of the contact rockers more strongly and thus cause a very quick opening.
  • the springs shown are compression springs, the function of which can optionally also be carried out by appropriately arranged leaf springs or torsion springs.
  • the contact arrangement consists of a movable contact arm with the main section 5 and the contact rocker 13 and a c-shaped fixed contact arm with the main section 6 and the contact rocker 14.
  • the contact rockers 13, 14 carry the contact pieces 1, 2 at their outer ends 16, 17 and an expansion bearing 24 at the inner ends 18, 19 Compression springs 20, 21 loaded, which are supported on a spring bearing 22 in the movable contact arm and on a spring bearing 23 in the fixed contact arm.
  • the inner ends 18, 19 of the contact rockers 13, 14 are electrically insulated from one another up to the respective pivot point 15 in such a way that arcing between them is prevented.
  • FIG. 1a shows the contact arrangement in the closed normal state.
  • the locking force acting on the main section 5 of the movable contact arm presses the contact rockers 13, 14 together on the contact pieces 1, 2 and on the expansion bearing 24, the required contact pressure being applied to the contact pieces 1, 2.
  • the springs 20, 21 are matched to one another in such a way that the contact rockers 13, 14 are aligned with the main sections 5, 6 of the contact arms in this operating state.
  • the contact rockers 13, 14 quickly form a relatively large angle to one another.
  • the plasma rays emerging perpendicular to the contact surfaces of the contact pieces 1, 2 will quickly migrate with their base points on the respective counter contact piece in the direction of the desired arc movement during the early rotation. From a certain opening angle, the plasma jets no longer have a base on the respective counter-contact piece and are directed into the space that lies between the contact pieces 1, 2 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 out of the contact space to the arc quenching chamber.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
EP87106355A 1986-05-02 1987-04-30 Kontaktanordnung für strombegrenzende Niederspannungs-Leistungsschalter Expired - Lifetime EP0243980B1 (de)

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
DE19863614866 DE3614866A1 (de) 1986-05-02 1986-05-02 Kontaktanordnung fuer strombegrenzende niederspannungs-leistungsschalter
DE3614866 1986-05-02

Publications (3)

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

Family

ID=6300010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106355A Expired - Lifetime EP0243980B1 (de) 1986-05-02 1987-04-30 Kontaktanordnung für strombegrenzende Niederspannungs-Leistungsschalter

Country Status (3)

Country Link
EP (1) EP0243980B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) ATE78953T1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE3614866A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534305A (en) * 1968-11-21 1970-10-13 Ite Imperial Corp Current limiting circuit breaker

Family Cites Families (6)

* 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.
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534305A (en) * 1968-11-21 1970-10-13 Ite Imperial Corp Current limiting circuit breaker

Also Published As

Publication number Publication date
EP0243980A3 (en) 1989-02-15
DE3780690D1 (de) 1992-09-03
DE3614866C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1989-04-06
ATE78953T1 (de) 1992-08-15
DE3614866A1 (de) 1987-11-05
EP0243980A2 (de) 1987-11-04

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