EP0992046A2 - Interrupteur de puissance basse tension comportant un arbre de commutation - Google Patents

Interrupteur de puissance basse tension comportant un arbre de commutation

Info

Publication number
EP0992046A2
EP0992046A2 EP98934772A EP98934772A EP0992046A2 EP 0992046 A2 EP0992046 A2 EP 0992046A2 EP 98934772 A EP98934772 A EP 98934772A EP 98934772 A EP98934772 A EP 98934772A EP 0992046 A2 EP0992046 A2 EP 0992046A2
Authority
EP
European Patent Office
Prior art keywords
shaft
low
switching
circuit breaker
voltage circuit
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
EP98934772A
Other languages
German (de)
English (en)
Other versions
EP0992046B1 (fr
Inventor
Ludvik Godesa
Peter Petznik
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0992046A2 publication Critical patent/EP0992046A2/fr
Application granted granted Critical
Publication of EP0992046B1 publication Critical patent/EP0992046B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/022—Details particular to three-phase circuit breakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
    • 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
    • H01H2009/0088—Details of rotatable shafts common to more than one pole or switch unit
    • 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
    • H01H2009/0094—Details of rotatable shafts which are subdivided; details of the coupling means thereof

Definitions

  • the invention relates to a multi-pole low-voltage circuit breaker with fixed and movable switch contacts, a drive device that actuates the movable switch contacts for switching on and off, and with a switch shaft for transmitting a driving force from the drive device to the movable switch contacts, the switch shaft being a central shaft and radially thereof protruding levers, which are connected to the drive device or to the switch contacts.
  • a circuit breaker with these features is described, inter alia, in DE 40 22 078 AI or DE 44 16 088 Cl.
  • the switching shaft is a core element of the switching mechanism of the circuit breaker, since it takes over the mechanical switching forces from the drive device common to all poles and forwards them to every movable switching contact of the circuit breaker.
  • the selector shaft interacts with latching devices to maintain the switch-on and switch-off positions.
  • Switching shafts are a special case in two respects.
  • the stress on a selector shaft is atypical in that it does not have a rotating, uniformly loaded load Represent part, but only perform a fraction of a revolution with changing direction of rotation and extremely jerky movement.
  • Circuit breakers at important points in electrical systems such as power distribution and supply of entire production lines.
  • the demand for a far above-average reliability of the control shafts is also based on the fact that the position of the control shaft in the switching mechanism of a circuit breaker means that it is completely beyond the observation of a user and therefore there is no possibility of timely detection of any damage that may occur.
  • circuit breakers With a service life of far more than the number of operating cycles of 10,000 required in the relevant regulations. As the worldwide demand for circuit breakers increases and so does it other areas of application are opened up, it is in the interest of the user to provide circuit breakers of high quality as inexpensively as possible.
  • the invention is intended to make a significant contribution to this.
  • this is done in that at least a section of the central shaft and an associated part of the protruding levers are designed as a one-piece switching shaft unit produced in a metal casting process.
  • the present invention overcomes the previous conviction of experts that the unusual stresses described at the outset can only be mastered by means of control shafts made of steel parts.
  • casting processes have long been used in mechanical engineering to produce shafts, casting shifters has not been considered.
  • the use of a casting process in switch construction enables a not inconsiderable cost reduction, which is all the more significant the larger and more complicated the switching shaft is.
  • Die-casting processes are particularly suitable in the context of the invention, because they are known to lead to particularly dimensionally accurate castings with a good surface finish.
  • Two zinc and aluminum based material compositions commonly used in die casting are suitable for the purposes of the invention.
  • a switching shaft for a three-pole low-voltage circuit breaker with a nominal current of 1000 A and a switching capacity of 50 kA was manufactured as a one-piece die-cast aluminum part and tested in an endurance test. All life requirements have been met. It was possible to measure the dimensions of the previous used steel selector shaft approximately and thus also the dimensions of the previous circuit breaker.
  • At least one conical recess is arranged centrally in the central shaft of the selector shaft unit.
  • FIG. 1 shows a selector shaft designed as a die-cast part in a partial longitudinal section.
  • FIG. 2 shows an end view of the selector shaft according to FIG. 1.
  • FIG. 3 shows a selector shaft composed of two sections.
  • the one-piece shift shaft unit 1 in FIG. 1 is made of die-cast aluminum. This manufacturing process and the aluminum alloys suitable for it are known. All the necessary information can be found in the specialist literature for metallurgical processes. It is not a special embodiment of such a manufacturing method for the invention, but rather its application for manufacturing of shift shafts essential.
  • the switching shaft unit 1 includes a central shaft 2, three levers 3 for actuating the movable switching contacts of a circuit breaker, as z. B. is described in the patent documents mentioned.
  • the middle lever 3 can at the same time
  • Coupling a drive device of the circuit breaker serve.
  • rounded curves 4 at the foot of the lever 3 ensure a good flow of force.
  • Levers have a region surrounding the central shaft in an eyelet-like manner, the lever 3 protrudes from the central shaft 2 on one side. This saves space in the switching mechanism of the circuit breaker.
  • FIGS. 3 and 4 illustrate a split version of a selector shaft, the selector shaft units 6 and 7 of which are approximately half the length of the selector shaft unit 1 shown in FIG. 1.
  • Both shift shaft units have a central shaft 8 or 9, each with two conical recesses 5.
  • the distribution in the example shown is asymmetrical such that the selector shaft unit 6 has two of the levers 3, while the selector shaft unit 7 has a clutch arm 10 and the remaining lever 3.
  • the switching shaft unit 7 engages with the coupling arm 10 the selector shaft unit 6.
  • a central shoulder 11 of the selector shaft unit 7 engages in a central recess 12 of the selector shaft unit 6.
  • switching shafts for four-pole circuit breakers or circuit breakers which have several movable switching contacts per pole can also be produced with a corresponding design.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Circuit Breakers (AREA)

Abstract

L'invention concerne un interrupteur de puissance basse tension multipolaire comportant un arbre de commutation servant à actionner des contacts de commutation. Cet arbre de commutation présente une tige centrale et des leviers faisant saillie par rapport à ce dernier pratiquement dans le sens radial, pour le raccordement à un dispositif d'entraînement ou aux contacts de commutation. Au moins une partie de la tige centrale (2) et une partie associée des leviers (3) sont produites sous forme d'unité d'arbre de commutation (1) d'une seule pièce, selon un procédé de coulage de métaux. De préférence, on met en oeuvre un procédé de coulée sous pression avec des alliages d'aluminium ou de zinc.
EP98934772A 1997-06-26 1998-05-19 Interrupteur de puissance basse tension comportant un arbre de commutation Expired - Lifetime EP0992046B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19727853 1997-06-26
DE19727853A DE19727853C1 (de) 1997-06-26 1997-06-26 Niederspannungs-Leistungsschalter mit einer Schaltwelle
PCT/DE1998/001406 WO1999000809A2 (fr) 1997-06-26 1998-05-19 Interrupteur de puissance basse tension comportant un arbre de commutation

Publications (2)

Publication Number Publication Date
EP0992046A2 true EP0992046A2 (fr) 2000-04-12
EP0992046B1 EP0992046B1 (fr) 2001-12-19

Family

ID=7834159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98934772A Expired - Lifetime EP0992046B1 (fr) 1997-06-26 1998-05-19 Interrupteur de puissance basse tension comportant un arbre de commutation

Country Status (4)

Country Link
EP (1) EP0992046B1 (fr)
JP (1) JP2002506558A (fr)
DE (2) DE19727853C1 (fr)
WO (1) WO1999000809A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19860717A1 (de) 1998-12-23 2000-06-29 Siemens Ag Schaltwelle für einen mehrpoligen elektrischen Leistungsschalter und Verfahren zu ihrer Herstellung
DE10010727C2 (de) * 2000-02-29 2002-03-07 Siemens Ag Schaltschloss für einen Niederspannungs-Leistungsschalter
KR100868512B1 (ko) * 2002-05-24 2008-11-12 마쓰모토유시세이야쿠 가부시키가이샤 열팽창성 마이크로 캡슐 및 그 이용
DE10340226A1 (de) * 2003-08-28 2005-03-31 Siemens Ag Gegossene Schaltwelle für Leistungsschalter und entsprechendes Herstellungsverfahren

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4931602A (en) * 1987-05-28 1990-06-05 Mitsubishi Denki Kabushiki Kaisha Multipole circuit breaker
DE4022078A1 (de) * 1990-07-10 1992-01-16 Siemens Ag Leistungsschalter mit unabhaengiger verklinkungseinrichtung des bewegbaren schaltkontaktes
DE4227352A1 (de) * 1992-04-01 1993-10-07 Siemens Ag Mehrpoliger Niederspannungs-Leistungsschalter mit einer Schaltwelle
DE4416088C1 (de) * 1994-04-20 1995-06-14 Siemens Ag Hebelanordnung zur Übertragung einer Antriebskraft

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9900809A3 *

Also Published As

Publication number Publication date
DE19727853C1 (de) 1998-11-26
WO1999000809A2 (fr) 1999-01-07
WO1999000809A3 (fr) 1999-04-15
JP2002506558A (ja) 2002-02-26
DE59802552D1 (de) 2002-01-31
EP0992046B1 (fr) 2001-12-19

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