EP1037242B1 - Dispositif de déclenchement thermique - Google Patents

Dispositif de déclenchement thermique Download PDF

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Publication number
EP1037242B1
EP1037242B1 EP00104871A EP00104871A EP1037242B1 EP 1037242 B1 EP1037242 B1 EP 1037242B1 EP 00104871 A EP00104871 A EP 00104871A EP 00104871 A EP00104871 A EP 00104871A EP 1037242 B1 EP1037242 B1 EP 1037242B1
Authority
EP
European Patent Office
Prior art keywords
fixed
bimetallic strip
contact
wire filament
release device
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
EP00104871A
Other languages
German (de)
English (en)
Other versions
EP1037242A2 (fr
EP1037242A3 (fr
Inventor
Erwin Dipl.-Ing. Muders
Werner Dipl.-Ing. Bruckner
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.)
ABB AG Germany
Original Assignee
ABB AG Germany
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 ABB AG Germany filed Critical ABB AG Germany
Publication of EP1037242A2 publication Critical patent/EP1037242A2/fr
Publication of EP1037242A3 publication Critical patent/EP1037242A3/fr
Application granted granted Critical
Publication of EP1037242B1 publication Critical patent/EP1037242B1/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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/164—Heating elements

Definitions

  • the invention relates to a thermal tripping device for an electrical switching device according to the preamble of claim 1.
  • Electrical line connections between a stationary, stationary terminal contact and the movable contact piece or the bimetallic inside a circuit breaker can only be made by stranded cables, so that the movement of the movable contact piece or, the bimetallic strip is not hindered.
  • a stranded wire connects, for example, to a terminal and is welded there; another welding point is located on the bimetallic strip, so that the current flows from the terminal to the bimetallic strip via two welded joints,
  • another stranded wire is required so that the movable contact piece, as mentioned, is not hindered in its movement.
  • there are four current-carrying welds within this circuit breaker which is why at high currents, the power loss is also high.
  • the U.S. 3,708,771 shows an overload protection device for electric motors with three current-carrying thermobimetals, each phase is associated with a bimetallic, and a bypass current path for each bimetal, in which the current path of each phase is divided into a first Operastrompfad by the bimetallic strip and a second Operastrompfad by a parallel to the thermobimetal, but with this unconnected, stranded wire.
  • the object of the invention is to provide a thermal trip device for an electrical switching device, in which the power loss is significantly reduced.
  • the number of current-carrying welded joints so the number of welded joints in which the current flows from a component in a stranded wire and from there into another component, reduced, insofar as provided only a welded joint between the stationary terminal contact and the movable contact piece are, which are traversed by the stream.
  • a welded connection of the stranded wire to the thermo-mechanical converter is not traversed by the current in this way, since a transfer of the current from the stranded conductor is not provided in the thermo-mechanical converter.
  • thermo-mechanical converter which may be, for example, a bimetallic strip, is heated by the fact that the current flows in the region of the connection point on the bimetallic strip and the heat that is present in the stranded conductor passes into the bimetallic strip, so that it is bent.
  • the bimetallic strip as well as the connection points and attachment points of the bimetallic strip are not Maschinenfilossen from the stream.
  • the thermal trip device which may be incorporated, for example, in a circuit breaker, has a terminal contact 20 which is housed fixed in the circuit breaker and, for example, belongs to a terminal. Also housed within the line switch is a support member 10 for a bimetallic strip 11, which support member 10 is L-shaped with a leg 12 and another leg 13. On the leg 13, a bimetallic support 15 is attached, which is also L-shaped and the leg 13 on both sides, which is of little importance to the invention. On the other leg 16 of the bimetal 15, the bimetallic strip 11 is fixed so that the bimetallic strip 11 together with the other leg 16 is approximately parallel to the leg 12 of the L-shaped support member 10 of the bimetallic strip 11. In the leg 12, an adjusting screw 14 is screwed, which rests against the bimetallic strip 11 and with the distance of the free end of the bimetallic strip to a latching in a switching mechanism of the circuit breaker belonging lever 45 is set.
  • a contact lever 25 to which a movable contact piece 30 is attached, which cooperates with a fixed contact piece.
  • the contact lever 25 is pivotable about an axis of rotation D, for example.
  • a line connection between the stationary terminal contact 20 and a starting point 26 on the contact lever 25 is achieved by means of a stranded wire 35, on the one hand at the terminal contact 20 via a first welded joint 27, the bimetallic strip 11 via a weld 28 and at the starting point 26 via a weld 29 with the contact lever 25 is connected.
  • the current thus flows through the weld 27 of the fixed terminal contact 20 in the stranded conductor 35 and continues to flow through the junction between the stranded conductor 35 and the contact lever 25 at the weld 29, so that in this arrangement two welds are traversed by the current.
  • the welded joint 28 between the stranded conductor 35 and the bimetallic strip 11 is not traversed by the current in this sense; the current flows quasi parallel to the bimetallic strip 11 through the stranded conductor 35 fixed there, so that both the bimetal holder 10, the carrier 15 and the bimetallic strip 11 are themselves de-energized.
  • the Fig. 2 shows the fixation of the bimetal mounting part 10 in a recess 41 of the housing 40 of the circuit breaker.
  • the Fig. 3 now shows a first embodiment of the weld between the stranded conductor 35 and the bimetallic strip 11;
  • the stranded conductor 35 is welded over a length L to the bimetallic strip 11, wherein the length L is chosen so that a sufficient heat transfer from the stranded conductor 35 to the bimetallic strip 11 is achieved.
  • the stranded conductor 35 is attached to the bimetallic strip 11 via two welding points 28a and 28b, the direct contact length being composed of two sections with the partial lengths L1 and L2.
  • the direct contact length being composed of two sections with the partial lengths L1 and L2.
  • the two attachment points 28a and 28b portion 35a of the stranded conductor 35 contribute to the heat transfer and heating of the bimetallic strip 11; however, the contribution of the direct points of contact 28a and 28b is significantly greater.
  • the invention is chosen based on an exemplary representation; There are also variants of the arrangement in this respect, for example, as the movable contact piece may be a double contact piece, with the two spaced-apart stationary contact piece are bridged.
  • the Litzentechnisch 35 also in more places than in Fig. 4 be fixed on the bimetallic strip 11.
  • the stranded conductor 35 is fixed with its weld 29 on a stationary contact piece or on a corresponding support for the stationary contact piece. It is essential - in any case - that sufficient mobility of the bimetallic strip is ensured.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicinal Preparation (AREA)
  • Protection Of Generators And Motors (AREA)
  • Vending Machines For Individual Products (AREA)

Claims (4)

  1. Dispositif de déclenchement thermique avec un convertisseur thermomécanique (11), par exemple un bilame thermique, pour un appareil de commutation électrique avec un élément de contact fixe et un autre mobile (30) et un point de fixation (16) pour le convertisseur thermomécanique (11), dans lequel est prévu entre un contact de raccordement stationnaire (20), par exemple sur une borne de raccordement, et l'élément de contact fixe ou mobile (30) un conducteur tressé (35) qui est fixé d'un côté au contact de raccordement stationnaire (20) et de l'autre côté à l'élément de contact fixe ou mobile (30) et fixé entre eux au convertisseur thermomécanique (11), caractérisé en ce qu'il n'y a pas de passage du courant du conducteur tressé (35) vers le convertisseur thermomécanique (11).
  2. Dispositif de déclenchement thermique selon la revendication 1, caractérisé en ce que le conducteur tressé (35) est fixé au moyen de soudures au contact de raccordement stationnaire (20), au convertisseur thermomécanique (11) et à l'élément de contact fixe ou mobile (30).
  3. Dispositif de déclenchement thermique pour un appareil de commutation, dont l'élément de contact mobile est fixé sur un levier de contact mobile ou pivotant, caractérisé en ce que le conducteur tressé (35) est fixé sur le levier de contact mobile (25).
  4. Convertisseur thermomécanique selon l'une des revendications précédentes, caractérisé en ce que le conducteur tressé (35) est fixé au convertisseur thermomécanique (11) au moyen d'au moins deux points de soudure.
EP00104871A 1999-03-18 2000-03-07 Dispositif de déclenchement thermique Expired - Lifetime EP1037242B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19912124A DE19912124B4 (de) 1999-03-18 1999-03-18 Thermische Auslöseeinrichtung
DE19912124 1999-03-18

Publications (3)

Publication Number Publication Date
EP1037242A2 EP1037242A2 (fr) 2000-09-20
EP1037242A3 EP1037242A3 (fr) 2002-04-10
EP1037242B1 true EP1037242B1 (fr) 2009-01-07

Family

ID=7901450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00104871A Expired - Lifetime EP1037242B1 (fr) 1999-03-18 2000-03-07 Dispositif de déclenchement thermique

Country Status (4)

Country Link
EP (1) EP1037242B1 (fr)
AT (1) ATE420450T1 (fr)
DE (2) DE19912124B4 (fr)
PL (1) PL339050A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006016648A1 (de) * 2006-04-08 2007-10-11 Hella Kgaa Hueck & Co. Fernbedienbarer Hochstromschalter

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2043306A (en) * 1932-10-29 1936-06-09 Westinghouse Electric & Mfg Co Circuit interrupter
US2884501A (en) * 1956-05-31 1959-04-28 Tung Sol Electric Inc Circuit protective device
ZA698654B (en) * 1969-12-12 1971-05-27 Fuchs Electrical Ind Ltd Improvements in or relating to overload protection for electric motors
DE7828060U1 (de) * 1978-09-21 1979-11-29 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Bimetallauslöser
DE3734396A1 (de) * 1987-10-10 1989-04-27 Asea Brown Boveri Elektrisches schaltgeraet
FR2722331B1 (fr) * 1994-07-08 1996-09-27 Legrand Sa Sous-ensemble thermique pour disjoncteur
DE4445170C2 (de) * 1994-12-17 1997-02-13 Abb Patent Gmbh Thermischer Auslöser
DE19838417B4 (de) * 1998-08-24 2004-04-29 Aeg Niederspannungstechnik Gmbh & Co Kg Thermische Auslösevorrichtung

Also Published As

Publication number Publication date
ATE420450T1 (de) 2009-01-15
PL339050A1 (en) 2000-09-25
DE50015508D1 (de) 2009-02-26
EP1037242A2 (fr) 2000-09-20
DE19912124B4 (de) 2007-10-11
EP1037242A3 (fr) 2002-04-10
DE19912124A1 (de) 2000-09-21

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