EP1128412A2 - Drehantrieb für einen Leistungsschalter, geeignet zur Betätigung eines Unterspannungsauslösers im voraus - Google Patents

Drehantrieb für einen Leistungsschalter, geeignet zur Betätigung eines Unterspannungsauslösers im voraus Download PDF

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Publication number
EP1128412A2
EP1128412A2 EP01200447A EP01200447A EP1128412A2 EP 1128412 A2 EP1128412 A2 EP 1128412A2 EP 01200447 A EP01200447 A EP 01200447A EP 01200447 A EP01200447 A EP 01200447A EP 1128412 A2 EP1128412 A2 EP 1128412A2
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
contacts
unit
main contacts
open
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.)
Withdrawn
Application number
EP01200447A
Other languages
English (en)
French (fr)
Other versions
EP1128412A3 (de
Inventor
Patrick Letient
Francesco De Vizzi
Fiorino Falchi
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.)
GE Power Controls Italia SpA
Original Assignee
GE Power Controls Italia SpA
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 GE Power Controls Italia SpA filed Critical GE Power Controls Italia SpA
Publication of EP1128412A2 publication Critical patent/EP1128412A2/de
Publication of EP1128412A3 publication Critical patent/EP1128412A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection

Definitions

  • Present invention relates to a rotating actuator of an electric circuit breaker, of the molded case kind, allowing to actuate auxiliary contacts of the electric circuit breaker to feed an undervoltage tripping unit thereof before the beginning of the closure operation of the breaker in order to prevent an unwanted tripping of the circuit breaker due to lack of voltage on the same undervoltage tripping unit.
  • circuit breakers housed in cabinets of electric control boards provided with doors When molded case circuit breakers housed in cabinets of electric control boards provided with doors are used, it is necessary, for safety reasons, that said circuit breakers have their contacts open when it is intended to open the door of the electric control board housing them, in order not to have fed both the main circuits and the auxiliary circuits while the door is open.
  • the doors of the electric board are provided with rotating knobs connected to some mechanism able to transform the rotating movement of the knob into alternate linear movement suited to a control lever of the circuit breaker and the opening possibility of the door has been conditioned to a position of the rotating knob corresponding to the position of the control lever for opening the main contacts of the circuit breaker.
  • a molded case circuit breaker to be used behind doors of electric control boards is provided, besides the main contacts, with other fittings, such as tripping units and auxiliary contacts to assure various auxiliary functions and state signals of the circuit breaker.
  • a safety need of the control boards provided with doors is that the circuit breakers have to be without supply voltage when the door of the board is to be open.
  • the circuit breaker has to open the main contacts when the voltage of the electric system falls under a pre-set safety value or automatically open when is either removed some protection or actuated an emergency control.
  • the circuit breaker is provided with a so-called "undervoltage tripping unit" producing the opening of the main contacts when the supply voltage falls under the pre-set safety value, or when a safety contact is actuated.
  • a particularly simple approach would be to keep the undervoltage tripping unit always connected to the main supply network, in order to allow the closure of the main contacts of the circuit breaker any time the network voltage is high enough.
  • Such an approach while particularly simple, suffers the drawback to have to always maintain the voltage on the undervoltage tripping unit and the circuit of the safety contacts, even when it is to open the door of the control board housing the circuit breaker.
  • Such a drawback comes up against the safety requirement of having all the components of the control board housing the circuit breaker without power supply when it is provided to rotate the knob of the circuit breaker to the opening position and thus it would be better to have the undervoltage tripping unit and the safety circuits without power supply when it is intended to open the door of the control board.
  • an auxiliary contact unit whose contacts are open when the main contacts of the circuit breaker are open, but before the beginning of the closure operation of the main contacts by a rotating knob controlling them, are closed in advance with respect to the control lever of the main contacts, allowing to supply power to the undervoltage tripping unit in order to avoid an unwanted operation of the tripping unit before the compete feeding thereof.
  • the undervoltage tripping unit will provide to prevent the closure of the main contacts till the return of the proper mains voltage.
  • a cam shaped disk arranged on a shaft of the rotating control knob of the circuit breaker, provided with a slot which in the opening position of the circuit breaker houses an end of a lever having a fulcrum fastened to a frame of the circuit breaker and the other end engaged in a slot of a slider actuating the contacts of a unit of auxiliary contacts so that the auxiliary contacts of the unit are closed as soon as a rotating movement of the knob, from the position of open main contacts to closed main contacts, is begun so that the undervoltage tripping unit is fed before the control lever of the main contacts begins the closure operation.
  • an actuator 10 according to the present invention comprises a central shaft 12, connected to a rotating knob (not shown) inserted into a cam shaped disk 14 comprising a re-entering slot 16 followed by a protruding hook cam 18.
  • the hook cam 18 has the duty of stopping the rotation of the shaft 12 and the disk 14 when the main contacts of the circuit breaker have been open.
  • a pin 20 moving a first end of a connecting arm 22 which is engaged, with an opposed end thereof, in a pin 24 fastened substantially at the middle of a lever 26 rotatable around a fulcrum 28 and engaged at the resistance end, where it is provided with a pin 30, in a square window 32 of a slider 34, which by means of two fingers 36 and 38 engages a control lever 40 of the main contacts of a circuit breaker in a molded case e42, as visible in Figure 3, where the lever 40 is in the position of open main contacts (also known as OFF position).
  • the shaft 12 of the disk 14 begins to clockwise rotate, as indicated by an arrow 44 in the figure 2.
  • the slot 16 in the disk 14 begins to engage an end 46 of a lever 48 rotating around a fulcrum 50, fastened to the frame of the actuator 10, and engages with the other end 52 a slot 54 of a slide 56 which begins to move in a direction indicated by an arrow 58.
  • the lever 26, moved by the connecting arm 22 displaces its pin 30 from a first side to the opposed one of the square window 32 and then the control lever 40 of the main contacts of the circuit breaker is not moved before the end of the run of the pin 30 into the window 32.
  • an unit 60 for auxiliary contacts is provided with an actuating push-button 62 which, when the actuator 10 is in the state depicted in figure 1, rests against the slider 56 so that the push-button 62 is pressed, as shown in figure 4.
  • the knob of the circuit breaker begins to rotate in the direction of the arrow 44 of the figure 2
  • the slide 56 moves in the direction of the arrow 58
  • the push-button 62 of the unit 60 for auxiliary contacts falls in a slot 64 of the same slide 56, by depressing.
  • To the push-button 621 is connected a movable contact bridge 66 which connects the fixed contact members 68 and 70.
  • the shaft 12 of the actuator 10 has been turned by a 90° angle in the direction indicated by the arrow 44.
  • the end 46 of the lever 48 remains lifted by the circumference of the cam shaped disk 14, so that the slide 56 remains always rightwards pushed by the action of the end 52 of the lever 48 within the slot 54 of the same slide 56.
  • the complete rotation of the shaft 12 and the cam shaped disk 14 moved the pin 20 of the connecting arm which, in turn, by means of the pin 24 moved the lever 26 to complete the clockwise rotation around the fulcrum 28 in order to compel the pin 30 inserted into the square window 32 of the slider 34 to move the same slider 34, carrying the control lever 40 of the main contacts of the circuit breaker 42 in the closing position (also known as ON position).
  • connection 22 rotates the lever 26 into the there shown position, moving, by engagement of the pin 30 into the square window 32, the slider 34 which operates on the lever 40 controlling the main contacts of the molded case circuit breaker 42, by causing their opening, as visible in Figure 3.
  • the profile of the slot 64 could be inverted, with protruding areas replaced by re-entrant areas, just provided to use auxiliary contact units having inverted contacts, i. e. with the fixed contact members 68 and 70 arranged above the movable contact bridge 66.
EP01200447A 2000-02-23 2001-02-08 Drehantrieb für einen Leistungsschalter, geeignet zur Betätigung eines Unterspannungsauslösers im voraus Withdrawn EP1128412A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI000325 2000-02-23
IT2000MI000325A IT1316658B1 (it) 2000-02-23 2000-02-23 Attivatore rotante per interruttori in grado di attivare in anticipoun loro sganciatore di minima tensione

Publications (2)

Publication Number Publication Date
EP1128412A2 true EP1128412A2 (de) 2001-08-29
EP1128412A3 EP1128412A3 (de) 2004-01-02

Family

ID=11444145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01200447A Withdrawn EP1128412A3 (de) 2000-02-23 2001-02-08 Drehantrieb für einen Leistungsschalter, geeignet zur Betätigung eines Unterspannungsauslösers im voraus

Country Status (2)

Country Link
EP (1) EP1128412A3 (de)
IT (1) IT1316658B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101887826A (zh) * 2009-05-13 2010-11-17 西门子公司 用于断路器的辅助脱扣单元

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19703973C1 (de) * 1997-02-03 1998-05-20 Siemens Ag Schaltgerät mit Unterspannungs-Hilfsauslöser
DE19717236A1 (de) * 1997-04-24 1998-10-29 Elektra Tailfingen Elektrisches Schaltgerät

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19703973C1 (de) * 1997-02-03 1998-05-20 Siemens Ag Schaltgerät mit Unterspannungs-Hilfsauslöser
DE19717236A1 (de) * 1997-04-24 1998-10-29 Elektra Tailfingen Elektrisches Schaltgerät

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101887826A (zh) * 2009-05-13 2010-11-17 西门子公司 用于断路器的辅助脱扣单元
US8526153B2 (en) 2009-05-13 2013-09-03 Siemens Aktiengesellschaft Auxiliary tripping unit for a circuit breaker
ES2421279R1 (es) * 2009-05-13 2013-09-06 Siemens Ag Unidad de disparo auxiliar para un interruptor de potencia
CN101887826B (zh) * 2009-05-13 2014-05-28 西门子公司 用于断路器的辅助脱扣单元

Also Published As

Publication number Publication date
IT1316658B1 (it) 2003-04-24
ITMI20000325A1 (it) 2001-08-23
EP1128412A3 (de) 2004-01-02
ITMI20000325A0 (it) 2000-02-23

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