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EP1701370A1 - Déclencheur de surintensité pour un disjoncteur de protection - Google Patents

Déclencheur de surintensité pour un disjoncteur de protection Download PDF

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Publication number
EP1701370A1
EP1701370A1 EP05405241A EP05405241A EP1701370A1 EP 1701370 A1 EP1701370 A1 EP 1701370A1 EP 05405241 A EP05405241 A EP 05405241A EP 05405241 A EP05405241 A EP 05405241A EP 1701370 A1 EP1701370 A1 EP 1701370A1
Authority
EP
European Patent Office
Prior art keywords
bimetallic strip
bend
overcurrent release
strip
release according
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Withdrawn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
EP05405241A
Other languages
German (de)
English (en)
Inventor
Siegfried Mayer
Manfred Forster
David Haller
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 Schweiz AG
Original Assignee
ABB Schweiz 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 ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP05405241A priority Critical patent/EP1701370A1/fr
Publication of EP1701370A1 publication Critical patent/EP1701370A1/fr
Withdrawn legal-status Critical Current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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H2037/523—Thermally-sensitive members actuated due to deflection of bimetallic element using a corrugated bimetal

Definitions

  • the present invention relates to the field of circuit breakers for low voltage distribution networks. It relates to an overcurrent release for a circuit breaker with a single-sided mounted bimetallic strip and provided with this overcurrent release circuit breaker.
  • protective circuit breakers designed as installation circuit-breakers serve the rapid and reliable protection of low-voltage lines, motors, equipment and systems from the consequences of overload and short-circuit currents. They each have a mostly thermally acting overcurrent release, which on a contact arrangement. the switch acts. When a thermal overcurrent occurs, this contact arrangement is generally opened by the thermal release causing the unlatching of a switching mechanism acting on the contact arrangement at a certain point in time.
  • a release mechanism unlatching the switching mechanism is generally acted upon by the free end of the bimetallic strip and is placed during operation of the switch a limited by two power connections active portion of the bimetallic strip in the current path of the switch.
  • FIG EP 0 616 350 A1 A circuit breaker with an overcurrent release based on a bimetallic strip is shown in FIG EP 0 616 350 A1 described.
  • the circuit breaker described contains an at least partially traversed by the switch current bimetallic spring.
  • This spring is designed as a rectilinearly extended strip and has an active section delimited by two current connections.
  • a long-duration overcurrent passed in this section heats the bimetallic strip.
  • the bimetallic strip is bent out and displaces a release pin, which in turn unlatches a switching lock of a current-switching contact arrangement in the on state of the switch and thus causes the switch of the overcurrent.
  • the invention has for its object to provide an overcurrent release for a circuit breaker based on a bimetallic strip, which has a high tripping accuracy and softer allows using the same bimetallic strip to set a variety of rated currents.
  • the bend is located near the bearing point of the bimetallic strip. Is a groove forming and limited by the metal of the bimetallic strip with the lower coefficient of thermal expansion recess of the bend on the trigger member facing side of the bimetallic strip, so an additional increase in the deflection is achieved.
  • two predominantly rectilinearly extending end portions of different lengths of the bimetallic strip connect to the bend.
  • the shorter of the two end sections is then held in a particularly simple embodiment on a depending on the rated current of the switch adjustable bracket and connected to a first of the two power connections.
  • the longer of the two end sections can then be connected in production-technically simple manner with the second power connection and have sufficient to set different rated currents length.
  • FIG. 1 From the part of the circuit breaker shown in Figure 1 is a made of a polymeric insulating material and mounting loops and webs containing housing half 10 can be seen.
  • the reference numeral 20 is a mounted in the switch housing 10, U-shaped downwardly bent bracket made of spring steel.
  • the right leg of the U is held on the housing and has at its end facing away from the base of the U a threaded opening in which a calibration screw 21 is rotatably mounted.
  • the left leg of the U is movably held in the housing and has a in the direction of movement of the calibration screw 21 displaceable, wide leg end 22.
  • the lower end 31 of a predominantly vertically aligned bimetallic strip 30 is secured, such as by welding or soldering.
  • This bimetal strip 30 is arranged so that its metal containing the larger coefficient of thermal expansion active side forms its left half.
  • the lower end 31 of the bimetallic strip is electrically conductively connected to a stranded wire 41, which in turn is fixed to a contact carrier 42 for a fixed switching contact 40 electrically conductive.
  • a strand 51 which is electrically conductively attached to a current connection 50 of the switch, is connected in an electrically conductive manner to the bimetal strip 30 at a point indicated by the reference numeral 32.
  • the upper freely movable end 33 of the bimetallic strip 30 acts on its metal from the bimetallic strip 30 lower coefficient of thermal expansion formed side with a pivotable release member 60 together, which unlatched in a known manner to open the switch with a biasing force and cooperating with the contact 40 movable contact carrier.
  • a bend 34 is formed in the manner of a groove in the bimetallic strip 30.
  • a groove forming this groove of this bend 34 is formed in the bimetallic strip on the side facing the trigger member.
  • the bend 34 is compared to the length of the bimetallic strip close to the bearing point at the leg end 22, that is not far from its lower end 31, respectively.
  • the bend 34 is formed in an active portion 35 of the bimetallic strip. During operation of the switch, the active section 35 is in the path of the current conducted by the switch and is limited by the two acting as a power connection points where the strands 41 and 51 are electrically connected to the bimetallic strip 30.
  • the bimetal strip is formed in the manner of an omega and has at the bend 34 subsequent, mainly rectilinearly extending end portions of different lengths.
  • the shorter of both end portions is formed by the end 31 of the bimetallic strip 30 and is thus held on the bracket 20 and connected to the strand 41, whereas the longer of both end portions 36 marked with reference numeral 36 is connected to the strand 51 and the free end of the bimetallic strip 33 wearing.
  • the tripping point of the current release is set by adjusting the calibration screw 21 and by pivoting the bimetallic strip 30 connected thereto.
  • the switch carries current flowing in a current path containing the active portion 35 of the bimetallic strip 30. If, over a predetermined, longer period of time, which can be in the range of seconds or minutes depending on the application, an overcurrent current is conducted, then the bimetal strip 30 bends so strongly that it strikes against the tripping member 60 with its free end 33 whereby the not shown latching of the contact carrier, also not shown, canceled and the switch is opened.
  • the active portion 35 is determined by suitable positioning of the strand 51 at the end portion 36 so that at a preset rated current, for example, 50 A, a defined heating resp. An associated bending of the bimetallic strip 30 results, which is below the trigger point.
  • the strand 51 can be fixed at a different position at the end section 36.
  • the rated current is changed, the same heating and, accordingly, the same bending of the bimetallic strip 30 result.
  • the strand 51 is positioned closer to the free end 33 of the bimetallic strip 30 than with larger rated currents.
  • the distance of the open end 33 of the bimetallic strip 30 from the trigger member 60 can be changed via the calibration screw 21, increased at high rated currents and reduced at low rated currents.
  • the bend 34 is now achieved on the one hand, that the bimetallic strip 30 has a higher rigidity. This is advantageous when the free end 33 of the bimetal strip strikes the tripping member 60, since the higher rigidity reduces a return spring that can not be avoided as a result of restoring forces. The tripping accuracy is therefore increased.
  • a greater deflection of the bimetallic strip is achieved with the same space requirement by the bend 34 but also. This is due to the fact that the bend 34 acts like an additional lever arm, which pivots the rectilinearly executed end section 36 virtually around an axis lying at the location of the bend 34. The curvature of the end portion 36 only plays a minor role.
  • the movement of acting as a trigger element free end of the bimetal strip 30 is quasi-linear, whereby a very precise triggering is made possible.
  • the large pivoting angle of the end section 36 caused by the bend 34 opens up the possibility of using the same bimetal strip 30 for a wide range of rated currents.
  • the individual rated currents can be as described above by means of the calibration screw 21 and / or by attaching the strand 51 at different positions of the end portion 36 of the bimetallic strip.
  • a particularly large deflection is achieved when compared to the length of the bimetallic strip 30, the bend 34 is disposed near the bearing point of the bimetallic strip at the leg end 22 of the bracket 20.
  • a further enlargement of the deflection results if the depression formed by the channel and bounded by the metal of the bimetallic strip with the lower coefficient of thermal expansion is arranged on the side of the bimetallic strip 30 facing the triggering element 60.
  • the bend 34 is generally semicircular and then encloses an angle of 180 °. But it can also extend over a smaller or larger angle range. For reasons of space, it is generally advantageous if the two rectilinearly guided end sections are arranged in line (omega shape). But there are also overcurrent release, in which the two end portions 31, 36 include a deviating from 180 ° angle with each other.
  • a bend 34 'curved in the opposite direction to the bend 34 can also be formed in the active section 35. Due to this bending as well as possibly subsequent bending, a meandering of the active section 35 is achieved. This also increases both the mechanical stability and the Ausbiege Scheme the bimetallic strip 30th

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  • Breakers (AREA)
EP05405241A 2005-03-11 2005-03-11 Déclencheur de surintensité pour un disjoncteur de protection Withdrawn EP1701370A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05405241A EP1701370A1 (fr) 2005-03-11 2005-03-11 Déclencheur de surintensité pour un disjoncteur de protection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05405241A EP1701370A1 (fr) 2005-03-11 2005-03-11 Déclencheur de surintensité pour un disjoncteur de protection

Publications (1)

Publication Number Publication Date
EP1701370A1 true EP1701370A1 (fr) 2006-09-13

Family

ID=34942939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05405241A Withdrawn EP1701370A1 (fr) 2005-03-11 2005-03-11 Déclencheur de surintensité pour un disjoncteur de protection

Country Status (1)

Country Link
EP (1) EP1701370A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122693A (en) * 1935-10-10 1938-07-05 Square D Co Bimetal and circuit breaker employing the same
US3291938A (en) * 1965-02-16 1966-12-13 Mechanical Products Inc Circuit breaker
DE8802281U1 (de) * 1988-02-22 1988-05-19 Siemens AG, 1000 Berlin und 8000 München Direkt beheizter Bimetallstreifen
EP0616350A1 (fr) 1993-03-19 1994-09-21 CMC Carl Maier + Cie AG Disjoncteur de protection de ligne
EP0887830A2 (fr) * 1997-06-26 1998-12-30 ABBPATENT GmbH Disjoncteur à courant de défaut

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122693A (en) * 1935-10-10 1938-07-05 Square D Co Bimetal and circuit breaker employing the same
US3291938A (en) * 1965-02-16 1966-12-13 Mechanical Products Inc Circuit breaker
DE8802281U1 (de) * 1988-02-22 1988-05-19 Siemens AG, 1000 Berlin und 8000 München Direkt beheizter Bimetallstreifen
EP0616350A1 (fr) 1993-03-19 1994-09-21 CMC Carl Maier + Cie AG Disjoncteur de protection de ligne
EP0887830A2 (fr) * 1997-06-26 1998-12-30 ABBPATENT GmbH Disjoncteur à courant de défaut

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