EP2387060A2 - Déclencheur thermique - Google Patents

Déclencheur thermique Download PDF

Info

Publication number
EP2387060A2
EP2387060A2 EP11002664A EP11002664A EP2387060A2 EP 2387060 A2 EP2387060 A2 EP 2387060A2 EP 11002664 A EP11002664 A EP 11002664A EP 11002664 A EP11002664 A EP 11002664A EP 2387060 A2 EP2387060 A2 EP 2387060A2
Authority
EP
European Patent Office
Prior art keywords
point
current
bimetallic strip
movable
contact piece
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
EP11002664A
Other languages
German (de)
English (en)
Other versions
EP2387060B1 (fr
EP2387060A3 (fr
Inventor
Manfred Hofmann
Rainer Dipl.-Ing. Ludovici
Heiko Dipl.-Ing. Stolz
Joachim Majewski
Wolfgang Dipl.-Ing. Pump
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 EP2387060A2 publication Critical patent/EP2387060A2/fr
Publication of EP2387060A3 publication Critical patent/EP2387060A3/fr
Application granted granted Critical
Publication of EP2387060B1 publication Critical patent/EP2387060B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H71/164—Heating elements
    • 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
    • H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
    • 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
    • H01H2071/167—Multiple bimetals working in parallel together, e.g. laminated together
    • 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
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms

Definitions

  • the invention relates to a thermal release for an electrical service switching device, in particular a circuit breaker, with a clamped on one side clamping preferably bimetallic strip with a power supply point, which bend at a current lying above rated current due to heating and can operate with its free end a switch lock, so in that a contact point formed by a fixed and a movable contact piece can be opened, according to the preamble of claim 1.
  • the invention further relates to an electrical service switching device with a contact point formed by a fixed and a movable contact, with a thermal release with a clamped on one side clamped preferably thermobimetal strip, which bend at a current lying above rated current due to heating and with its free end Can actuate switch lock, so that the contact point can be opened, according to the preamble of claim 3.
  • Indirect heating causes the current to flow through a conductor located near the bimetallic strip. Its heat is transferred by radiation, heat conduction or convection on the bimetallic strip and heats this indirectly. Indirect heating is often used at high rated currents. Because with increasing nominal current strength bimetals with smaller specific resistances and thermal deflections must be used in direct heating, the heating lengths are reduced and the cross-sectional areas of the bimetals are increased in order to guarantee the function of the thermal release while maintaining a certain switching power dissipation or - warming. The tolerance influences on the heating and deflection of the bimetallic releases thereby increase.
  • the indirect heating is suitable for large nominal current intensities, in which the heat input to the bimetallic strip can be adapted to an optimally adapted bimetal by designing the heat coupling between the current-carrying conductor and the bimetallic strip.
  • an indirect heating is mechanically complex, since it must be ensured that the heat transfer to the bimetallic strip does not change during operation.
  • the DE 10 2008 017 472 A1 shows a main circuit breaker with a main flow path arranged in the main bimetal direct heating.
  • the power supply to the bimetallic strip is carried out at the clamping point.
  • the strand leads to the movable contact piece, where it is again welded.
  • another strand leads to the arc guide rail, which is associated with the movable contact piece and leads the arc root of a switching arc in an arc quenching device.
  • the Indian DE 10 2008 017 472 A1 shown main circuit breaker is not suitable for applications with very high rated currents of, for example, 100A or more.
  • Regarding the function and the general interaction of the thermal release with the derailleur and the arc quenching device should the revelation of DE 10 2008 017 472 A1 be included in the disclosure of the present invention.
  • the object of the invention is to provide a thermal release of the type mentioned for large current ratings, preferably of 100A or more, with high tripping accuracy, low power dissipation and simple, inexpensive construction.
  • Another object of the invention is to provide an electrical service switching device of the type mentioned, in particular a main line circuit breaker, which can be used for very high rated currents, preferably 100A and more.
  • a first current removal point is arranged between the clamping point and the free end of the bimetallic strip on the bimetallic strip.
  • a conductor plate which extends from the first current removal point in the direction of the free end of the bimetallic strip and is spaced from the bimetallic strip, is connected to the first current removal point is.
  • a second current dissipation point is disposed at the end of the conductor plate opposite to the first current dissipation point, and a movable conductor is connected to the second current dissipation point connecting the second current dissipation point to a movable or fixed contact piece.
  • the advantage of the invention is that a partial direct and a partial indirect heating of the bimetallic strip is achieved.
  • the thermal release according to the invention combines the advantages of direct heating with respect to the simple mechanical structure with the advantages of indirect heating in terms of usability at very high rated currents, preferably 100A and more.
  • the area of direct heating extends from the power supply point to the first power take-off point.
  • this area may be about one half or one third of the total length of the bimetallic strip.
  • the entire length and the cross section of the bimetallic strip is unchanged from the version at low rated currents. It is therefore possible to use one and the same type of bimetallic strip for the directly heated version with low nominal currents and the mixed heated version for very high rated currents of 100 A and more.
  • the zone of direct heating is still reduced compared to a completely directly heated variant.
  • the mechanical structure is simpler than in a over the entire length indirectly heated bimetallic strip.
  • There is no greater space requirement for the bimetallic strip compared to a completely directly heated variant, as in the DE 10 2008 017 472 A1 is shown, and also the production, ie the insertion of the bimetallic assembly in the device, does not differ and is the same as in the directly heated variant.
  • the optimum location for attaching the first current removal point may be different, closer or further away from the clamping point. Through experiments or simulation, however, it can be determined easily.
  • two mutually parallel movable conductors are connected to the second current removal point, which connect the second current removal point with a movable or fixed contact piece.
  • the connection between the second Stromab Industriesstelle and the movable or fixed contact piece has a high current carrying capacity at the same time good mobility.
  • An inventive installation switching device is characterized in that a first Stromab arrangementsstelle between the clamping and the free end of the bimetallic strip is arranged on the bimetallic strip, that at the first Stromab operationsstelle a conductor plate is connected, extending from the first current removal point in the direction of the free end of the bimetallic strip extends and is spaced from the bimetallic strip, that a second current removal point on the the first current removal point opposite end of the conductor plate is arranged, and that at the second current removal point, a movable conductor is connected, which connects the second current removal point with the movable or fixed contact piece.
  • An installation switching device has an arc extinguishing device and a guide rail, which leads a switching arc to the arc extinguishing device, wherein on the movable contact piece, a movable conductor is connected, which connects the movable contact piece with the guide rail.
  • the advantageous effect of this embodiment is that an additional Blasschleife arises, which drives the arc for deletion at the opening of the contact point.
  • the commutating voltage drop that the arc must overcome in commutating from the moving contact to the counterguide rail is reduced, causing it to commutate faster on the guardrail and thereby accelerate arc quenching.
  • FIG. 1 shows a schematic representation of a service switching device 1 with a housing 2. There are in the FIG. 1 However, not all components, components and components of a service switching device shown, but only those required to explain the present invention relating to a thermal actuator assembly.
  • a main current path passes through a thermal release with a main bimetallic strip 5, a contact point formed between a fixed and a movable contact piece 6, 7, and a magnetic release 8.
  • the movable contact piece is located at a Contact lever 9 which is pivotally mounted on a rotation axis 10.
  • the main thermostatic bimetal strip 5 can act on a derailleur 12 in the event of heat-induced bending, represented by a first line of action 13, so that the rear derailleur 12 then acts on the contact lever 9 along a second line of action 14 and in the opening direction, here in the counterclockwise direction, pivoted.
  • the main bimetallic strip 5 is clamped on one side at a clamping point 19. It is there connected to a bus bar 20, for example, welded, which establishes the connection to the first terminal 3.
  • a conductor plate 21 is welded to the main bimetallic strip 5.
  • the welding point is also referred to as the first current removal point 27.
  • the conductor plate 21 has a short attachment leg 22, with which it rests flat against the main bimetallic strip 5, to provide a low contact resistance. This is followed by a short spacer leg 23, then followed by a longer heat transfer leg 24 connects.
  • the heat transfer leg 24 runs at a small distance parallel to the main bimetallic strip until just before the end. This is on the one hand a galvanic decoupling of the heat transfer strip 24 of the main bimetallic strip 5 given at the same time good heat coupling of the two strips.
  • the conductor plate 21 can be produced in a particularly simple manner as a stamped and bent part.
  • a movable conductor in the form of a stranded wire 25 is fixed by means of a welding point, whose second end is welded to the movable contact piece 7 or the contact carrier of the movable contact piece on the contact lever 9.
  • the weld point is also referred to as second current removal point 28.
  • a second strand 26 connects the contact lever 9 with the second arc guide rail.
  • the main bimetallic strip 5 is heated directly in its first third, between the clamping point 19 and the first current removal point 27, and then then indirectly via the conductor plate 21.
  • the position of the first current removal point 27, depending on the design of the main bimetallic strip and at a different location on the Main bimetallic strip 5 are located.
  • the Fig. 2 shows a thermal release assembly as described above, the compact structure as a prefabricated assembly and small footprint with full functionality in a circuit breaker, for example, in a selective main circuit breaker as in DE 10 2008 017 472 A1 shown, can be used.
  • a further strand 25 ' is provided parallel to the strand 25 between the second Stromab Operationssstelle 28 and the contact carrier 29 of the movable contact piece 7 in order to further increase the current carrying capacity while maintaining flexibility of the compound, so that unimpeded movement of the movable contact piece and the Main bimetallic strip is ensured.
  • the main current path shown in the figure with the thermal release, the contact point, the magnetic release corresponds to a main current path, as in the DE 10 2008 0172 472 A1 is shown.
  • a secondary current path with a selective resistor, a selective bimetallic strip and a secondary contact point and its interaction with the main current path for selective shutdown of the connected external circuit is described.
  • the present invention also encompasses any combinations of preferred embodiments as well as individual design features or developments, provided that they are not mutually exclusive.

Landscapes

  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
EP11002664.8A 2010-05-11 2011-03-31 Déclencheur thermique Active EP2387060B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010020245 DE102010020245A1 (de) 2010-05-11 2010-05-11 Thermischer Auslöser

Publications (3)

Publication Number Publication Date
EP2387060A2 true EP2387060A2 (fr) 2011-11-16
EP2387060A3 EP2387060A3 (fr) 2012-06-27
EP2387060B1 EP2387060B1 (fr) 2017-05-17

Family

ID=44222770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11002664.8A Active EP2387060B1 (fr) 2010-05-11 2011-03-31 Déclencheur thermique

Country Status (3)

Country Link
EP (1) EP2387060B1 (fr)
CN (2) CN201893300U (fr)
DE (1) DE102010020245A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012003169A1 (de) * 2012-02-17 2013-08-22 Abb Ag Thermische Auslöserbaugruppe und Installationsschaltgerät mit einer thermischen Auslöserbaugruppe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008017472A1 (de) 2007-04-28 2008-11-06 Abb Ag Installationsschaltgerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2657292A (en) * 1952-12-29 1953-10-27 Gen Electric Thermal element for switch mechanisms
FR2553928B1 (fr) * 1983-10-21 1986-08-08 Merlin Gerin Bilame a chauffage mixte pour declencheur thermique d'un appareil de coupure
DE4300909C2 (de) * 1993-01-15 1997-02-06 Abb Patent Gmbh Thermischer Auslöser, insbesondere für einen Leitungsschutzschalter
DE102008007520B4 (de) 2008-02-01 2013-03-28 Rolf Kammerer Oberflächenbearbeitungsgerät

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008017472A1 (de) 2007-04-28 2008-11-06 Abb Ag Installationsschaltgerät

Also Published As

Publication number Publication date
EP2387060B1 (fr) 2017-05-17
EP2387060A3 (fr) 2012-06-27
DE102010020245A1 (de) 2011-11-17
CN102243950A (zh) 2011-11-16
CN201893300U (zh) 2011-07-06

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