EP0266762B1 - Strombegrenzendes elektrisches Schaltgerät - Google Patents

Strombegrenzendes elektrisches Schaltgerät Download PDF

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Publication number
EP0266762B1
EP0266762B1 EP87116282A EP87116282A EP0266762B1 EP 0266762 B1 EP0266762 B1 EP 0266762B1 EP 87116282 A EP87116282 A EP 87116282A EP 87116282 A EP87116282 A EP 87116282A EP 0266762 B1 EP0266762 B1 EP 0266762B1
Authority
EP
European Patent Office
Prior art keywords
contact arm
contact
locking
fulcrum
switch
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
EP87116282A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0266762A2 (de
EP0266762A3 (en
Inventor
Hermann Dr. Hochhaus
Helmut Dipl.-Ing. Drewes
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 AT87116282T priority Critical patent/ATE84914T1/de
Publication of EP0266762A2 publication Critical patent/EP0266762A2/de
Publication of EP0266762A3 publication Critical patent/EP0266762A3/de
Application granted granted Critical
Publication of EP0266762B1 publication Critical patent/EP0266762B1/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
    • 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
    • H01H77/104—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 with a stable blow-off position

Definitions

  • the invention relates to an electrical switching device according to the preamble of claim 1.
  • the shortest possible switch-off delay times (e.g. 2 ms or less) are required. These times cannot be achieved with the usual lock constructions (on / off mechanism, quick release device by means of a magnetic release) due to the masses to be accelerated and the lever paths to be traveled.
  • the short-circuit current itself must therefore contribute to the accelerated opening of the switching elements (dynamic opening).
  • the electrodynamic effect on the contact arms is generally relatively small in the nominal current and overload range, but in the event of a short circuit, usable forces result from the quadratic current dependence. Currents are problematic, the amplitude of which causes lifting and a slight opening of the contact pieces, but is too small for further acceleration of the contact arm masses are. This can lead to the contacts being closed again or to undesired bouncing processes.
  • a construction is known from DE-A-1463 320, in which a releasable toothed rack coupling is present between the movable contact piece of the contact system and a rotary or swiveling lever causing the release of a switching lock, which frictional connection between the movable contact piece and then produces the rotary or pivoting lever when the movable contact piece strives to perform a closing movement opposite to the opening movement during the opening process, e.g. B. when rebounding from a stop or with an imperfect opening.
  • the object of the invention is to improve a switching device of the type mentioned above in such a way that after an electrodynamic opening of the contact system with simple means an operationally reliable locking of the movable switching contact arm is ensured in any position-dependent positions, which can be released again.
  • the additional switching function can be integrated with relatively few construction parts, and the arc extinguishing is improved with increased security for the switching system and the subordinate and elements to be protected.
  • the lock release mechanism can be made simpler, since its mechanical delay time is no longer critical for the switch-off behavior.
  • a minimum contact distance can be set, at which earliest it is kept open after dynamic lifting.
  • skilful shaping of the locking lugs a progressive inhibition can be achieved on the opening switch contact arm, which prevents strong opening and / or bouncing back at very high currents.
  • the switch is in the switch position "on".
  • the contact piece 1 on the movable contact arm 2 lies on the fixed contact piece 3, which is arranged on a loop-shaped power supply 4.
  • the key switch 5 is in the locked position.
  • a certain contact force is predetermined by the lever mechanism and a spring 6.
  • a toothing 7 is attached, which interacts with a spring 8 arranged in the housing bottom.
  • the lower knee joint lever 9 of the switching lock 5 and the switching shaft 10 are articulated on the contact arm 2 via a lever 11 by means of a bolt 12.
  • the movable contact arm 2 is repelled against the force of the spring 6 by the forces which arise from the loop-shaped design of the power supply and rotates about an axis A (bolt 12) on a circular path a (FIG. 1b switch dynamically opened ). If the repulsive force overall is so strong that the spring 8 engages at least in the first toothing 7, it is no longer possible to close or rebound the contacts. The arc between the contact pieces must commute as quickly as possible from these on tracks or directly into an extinguishing system.
  • the now unlocked switching lock 5 acts a short time later on the contact arm 2 and lifts it in another way b around the pivot point B, the latching being released. The arm is guided on path b to the end position (Fig. 1c switch open).
  • a stepless inhibition is achieved in that the contact arm 2, instead of a toothing as in the example according to FIG. 1, has a part 13 rounded off with a radius r, which cooperates with a spring-loaded friction roller 14, 15 in the housing base.
  • the contact arm 2 can be moved along the roller 15.
  • the roller 15 wedges in the opposite direction (closing of the contacts) the contact arm 2 with the housing bottom.
  • the escapement is released again when the mechanical switching lock 5 lifts the contact arm 2 from path a with the pivot point A to path b with the pivot point B in the direction of the switch-off position
  • FIG. 2c. 2b shows the dynamic open position in which the contact arm 2 is prevented from returning by the friction roller 15.
  • the variant according to FIG. 3 differs from the embodiment according to FIG. 1 in principle in that the cams 17 for latching or latching are part of a housing or bulkhead wall 18 or can be inserted into this as a special component.
  • the counterpart for the cams 17 can be a bolt 19 in the contact arm 2.
  • FIG. 4 Another solution to the problem is shown in FIG. 4. Thereafter, cams 21 are mounted in opposite housing walls 20. A limitation to certain radii is not necessary.
  • the locking takes place by means of an elastic cam 22 on the movable contact arm 2.
  • the force in the opening direction causes the cams to "ratchet” until the contact arm 2 stops.
  • the movement of the arm back or even in the fully open position of the switching device requires at least one force F to overcome it another cam.
  • This force must be applied from the unlocked switch lock to the opening, or from the mechanical or electrical actuation unit (spring-loaded mechanism, coil, armature, motor drive, manual control device).

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Fuses (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP87116282A 1986-11-06 1987-11-05 Strombegrenzendes elektrisches Schaltgerät Expired - Lifetime EP0266762B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87116282T ATE84914T1 (de) 1986-11-06 1987-11-05 Strombegrenzendes elektrisches schaltgeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863637913 DE3637913A1 (de) 1986-11-06 1986-11-06 Strombegrenzendes elektrisches schaltgeraet
DE3637913 1986-11-06

Publications (3)

Publication Number Publication Date
EP0266762A2 EP0266762A2 (de) 1988-05-11
EP0266762A3 EP0266762A3 (en) 1989-02-22
EP0266762B1 true EP0266762B1 (de) 1993-01-20

Family

ID=6313357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116282A Expired - Lifetime EP0266762B1 (de) 1986-11-06 1987-11-05 Strombegrenzendes elektrisches Schaltgerät

Country Status (3)

Country Link
EP (1) EP0266762B1 (enrdf_load_stackoverflow)
AT (1) ATE84914T1 (enrdf_load_stackoverflow)
DE (2) DE3637913A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5793270A (en) * 1996-09-03 1998-08-11 Eaton Corporation Circuit breaker with latch preventing rebound of blow open contact arm
DE102005046640B4 (de) * 2005-09-29 2007-10-18 Abb Patent Gmbh Elektrisches Installationsgerät

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1986601U (de) * 1963-04-11 1968-06-06 Licentia Gmbh Selbstschalter.
GB1052519A (enrdf_load_stackoverflow) * 1963-04-11 1900-01-01
DE1463320A1 (de) * 1963-06-28 1969-03-27 Licentia Gmbh Selbstschalter
US4409573A (en) * 1981-04-23 1983-10-11 Siemens-Allis, Inc. Electromagnetically actuated anti-rebound latch
US4528531A (en) * 1983-12-19 1985-07-09 Westinghouse Electric Corp. Molded case circuit breaker with improved operating mechanism
US4594567A (en) * 1984-09-28 1986-06-10 Siemens-Allis, Inc. Circuit breaker contact arm assembly having a magnetic carrier
US4608545A (en) * 1985-09-24 1986-08-26 Siemens-Allis, Inc. Movable contact arm assembly for a current limiting circuit breaker

Also Published As

Publication number Publication date
ATE84914T1 (de) 1993-02-15
EP0266762A2 (de) 1988-05-11
DE3783719D1 (de) 1993-03-04
DE3637913C2 (enrdf_load_stackoverflow) 1989-10-19
EP0266762A3 (en) 1989-02-22
DE3637913A1 (de) 1988-05-19

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