EP0177437B1 - Assemblage de contact pour un interrupteur de puissance avec rupture dépendant du courant - Google Patents

Assemblage de contact pour un interrupteur de puissance avec rupture dépendant du courant Download PDF

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Publication number
EP0177437B1
EP0177437B1 EP85730126A EP85730126A EP0177437B1 EP 0177437 B1 EP0177437 B1 EP 0177437B1 EP 85730126 A EP85730126 A EP 85730126A EP 85730126 A EP85730126 A EP 85730126A EP 0177437 B1 EP0177437 B1 EP 0177437B1
Authority
EP
European Patent Office
Prior art keywords
contact
contact arm
carrier
current
arm
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
Application number
EP85730126A
Other languages
German (de)
English (en)
Other versions
EP0177437A2 (fr
EP0177437A3 (en
Inventor
Bernard Dimarco
Charles W. Stanford
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 EP0177437A2 publication Critical patent/EP0177437A2/fr
Publication of EP0177437A3 publication Critical patent/EP0177437A3/de
Application granted granted Critical
Publication of EP0177437B1 publication Critical patent/EP0177437B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position

Definitions

  • the invention relates to a contact arrangement for a circuit breaker with a current-dependent opening, having the following features: a first electrically conductive contact arm with a contact piece attached to its end; a second electrically conductive contact arm with a contact piece attached to its end; a U-shaped ferromagnetic yoke encompassing the current-carrying part of the second contact arm for generating a force acting in the sense of the separation of the contact arms; a pivotally mounted carrier for pivotally receiving the second contact arm.
  • a contact arrangement of this type is known from US-A-4219790.
  • the ferromagnetic yoke is arranged in a fixed position, the pivot axis of the carrier of the second contact arm and the pivot axis of the contact arm on the carrier being assigned to the yoke such that both the desired current-dependent opening of the second contact arm is independent of the carrier and the pivoting of the Carrier can take place together with the second contact arm.
  • dimensions result that make it difficult to achieve the smallest possible dimensions with high performance of a switching device.
  • the object of the invention is to simplify a contact arrangement with a current-dependent opening of the type mentioned at the outset while maintaining the known mode of operation in such a way that the desired small dimensions can be achieved.
  • the ferromagnetic yoke is designed as a carrier of the second contact arm and that for this purpose the side parts of the carrier are dimensioned according to a swivel angle of the second contact arm provided for the current-dependent separation of the contact arms.
  • the carrier performs a dual function, since it effects the normal movement of the second contact arm for switching on and off and additionally exerts an opening force on the second contact arm when high fault currents occur, the second contact arm carrying out an opening movement relative to the carrier can.
  • At least one of the side parts of the carrier of the second contact arm can have a cam track for a roller which is attached to the second contact arm and is displaceably arranged in the longitudinal direction and acted upon by the force of a spring.
  • This cam track can ensure a desired movement behavior of the second contact arm relative to its carrier during the switching operations.
  • the cam track can have a recess for engaging the roller in the normal position of the contact arm and, following the recess, an area with a decreasing radius with respect to the abutment of the spring on the carrier and an area with an increasing radius. If the roller is in the recess, the spring acts as a contact force spring and enables the desired pressure of the carrier when it is switched on.
  • the roller If a high fault current occurs, the roller is pressed out of the recess due to the forces acting on the second contact arm and now reaches the area with a decreasing radius. Since a movement of the roller along the cam track corresponds to a reduction in the spring tension, the second contact arm executes a strongly accelerated opening movement. The adjoining area with increasing radius brakes the movement of the contact arm, whereby damage to parts when approaching the end position of the contact arm is avoided.
  • the middle part of the U-shaped support of the second contact arm can be designed as an abutment of a clamp which is to be fastened to the middle part for connecting a cross member with two or more contact arrangements.
  • the carrier can thus be used in the same way in the switching mechanism of a circuit breaker as is the case with conventional carriers which do not exert an opening force on a contact arm.
  • a contact arrangement according to the invention can be brought to a particularly high efficiency in that the first contact arm forms a loop-shaped current path with the second contact arm in the closed position of the contact arrangements, as is known per se.
  • FIG. 1 shows a schematic view of a pole of a circuit breaker with the cover removed to expose a current-dependent opening contact arrangement.
  • FIG. 2 is a somewhat enlarged view of a carrier with a contact arm contained in the circuit breaker according to FIG. 1.
  • FIG. 3 the carrier of the arrangement according to FIG. 2 is shown enlarged in a side view.
  • Figure 4 is a view of the carrier along line IV-IV in Figure 3, while Figure 5 is a view along line V-V in Figure 3.
  • the pole 10 of a low-voltage circuit breaker shown in FIG. 1 has a contact arrangement 12 with a first, fixed contact arm 14 and a second, movable contact arm 16. Both contact arms are assigned to one another in such a way that current flows through them in opposite directions in the closed position. This causes repulsive forces which push the contact arms 14 and 16 apart and separate contact pieces 15 and 17 located at the ends of the contact arms 14 and 16 when strong overcurrents occur, such as occur in the event of a fault.
  • the contact arrangement 12 contains a carrier 18, on which the movable contact arm 16 is attached.
  • the carrier 18 encompasses the movable contact arm 16 and exerts a magnetic opening force thereon, which supports the repulsive force acting between the contact arms when strong overcurrents occur.
  • the carrier 18 has an essentially U-shaped shape with parallel side parts 20 and 22 which are formed in one piece with a rectangular central part 24.
  • the middle part 24 has openings 26 for the passage of bending tabs of a bracket 28.
  • the side parts 20 and 22 are completely the same, so that only the side part 20 is described in detail below.
  • the side part 20 contains a bearing opening 29 through which a bearing pin 30 extends as a pivot bearing for the carrier 18 and the contact arm 16. Near the bearing pin, a flexible current band 19 is connected to the contact arm 16, so that a part of the contact arm 16 through which the current flows almost completely is overlapped by the carrier 18.
  • the side part 20 Approximately in a concentric position to the bearing opening 29, the side part 20 has a curved track 31 which has differently shaped sections. One of these areas is a recess 32 located near one edge 21 of the side part 20 with an approximately circular arc 33 and a subsequent bevel 34. Following the bevel 34, the cam track 31 has an area 35 which decreases in radius with respect to the bearing pin 30 runs. Following a border area designated by 36, the cam track 31 has a further area 37 with increasing radius with respect to the bearing bolt 30. At its end facing the central part 24, the cam track 31 has a sloping shoulder 38. The cam track 31 controls with its previously mentioned areas in one still to be described, the movement of the movable contact arm 16 under the influence of a high fault current.
  • the contact arm 16 is provided with a cross pin 39 projecting on both sides as a pivot bearing for two symmetrically arranged rollers 40.
  • Two helical tension springs are supported on the bearing pin 30 and the transverse pin 39, the springs lying on both sides of the contact arm 16 within the rollers 40. The springs bias the rollers 40 in the direction of the curved path 31 of the carrier 18.
  • the rollers 40 are located in the cutouts 32, so that the movable contact arm 16 is, as it were, coupled to the carrier 18 and can be moved between an open and a closed position of the contact arrangement by means of its pivoting by means of a suitable drive device, the contact arms 14 and 16 are brought into contact or separated accordingly.
  • This process corresponds to a normal switching on and off by hand or an automatic tripping of the circuit breaker if a fault current that is not too high occurs. If such a high fault current occurs, for. B. due to a short circuit, so electrodynamic and electromagnetic forces cause a separation of the contact arms 14 and 16 regardless of the tripping device of the circuit breaker in initially unchanged position of the carrier 18.
  • the rollers 40 during the initial movement of the contact arm 16 in the direction 2 and 3 moves upwards along the slope 34 until they leave the recess 32 and reach the area 35 of the curved track 31. Since the area 35 with respect to the bearing pin 30, on which the helical tension springs engage, reduces its radius in the direction of arrow A, the springs endeavor to relax, with the contact arm 16 carrying out an accelerated movement in the direction of arrow A. After the limit area 36 has been exceeded, however, the movement of the contact arm is braked, since the rollers now reach the area 37 of the cam track 31, the radius of which increases with respect to the bearing pin 30 in the direction of arrow A. At the end of the movement, the rollers 40 come to the shoulder 38 and hold the movable contact arm 16 in the open position. The contact arm 16 can thus not be thrown back into the closed position after it has been driven into the open position by the electrodynamic forces.
  • the trip device of the circuit breaker is constructed such that the initial opening movement of the contact arm 16 actuates the trip device of the pole 10 of the circuit breaker.
  • the movement of the carrier 18 thereby brought about into the open position causes a relative movement between the carrier 18 and the contact arm 16 in order to return it to the starting position and thereby bring the rollers 40 back into the recess 32.
  • the roller 40 is usually located in the curve 33 of the recess 32. This state exists during the closing movement of the contact arm 16 to the point where the movable contact arm 16 and the fixed contact arm 14 or their contact pieces 15 and 17 touch. However, the carrier 18 continues its movement in the closing direction (counterclockwise in FIGS. 1 and 2), as a result of which the roller 40 reaches the bevel 34, which leads to an increase in the tension of the coil tension springs, since the cross pin 39 in a recess 41 in the longitudinal direction of the contact arm 16 is displaceable relative to this.
  • the recess 41 is delimited by a recess of the contact arm 16 and a guide bracket covering the recess.
  • the selected angular position of the bevel 34 in relation to the direction of engagement of the helical tension spring leads to a relatively strong force component in the closing direction.
  • the circuit breaker described uses current-dependent forces in two ways.
  • the movable contact arm 16 and the fixed contact arm 14 are very close to each other in the switched-on position and are arranged such that a loop-shaped current path is formed as a result of the current transfer on the switching elements 15 and 17.
  • Such an arrangement is e.g. As described in US-A-4409573.
  • the contact arms repelling forces are generated.
  • Another opening force is obtained in that the U-shaped carrier 18 of the movable contact arm 16 is made of a magnetic material, for. B.
  • the contact arm 16 is attracted in the direction of the closed end of the U-shape, ie in the direction of the central part 24.
  • the side parts 20 and 22 of the carrier 18 so dimensioned that the contact arm 16 in the closed position runs approximately parallel to the edge 21 of the side part 20 and the side part 22 and that the central part 24 is so far away from this edge 21 that the desired pivoting angle of the contact arm 16 results .
  • the carrier 18 reinforces the intrinsic magnetic field of the contact arm 16, the current-carrying part of which lies between the side parts 20 and 22 of the carrier 18, and pulls it towards the central part 24.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Claims (5)

1. Système de contacts (12) pour un interrupteur de puissance à ouverture en fonction du courant, comportant les éléments suivants:
- un premier bras de contact (14) électriquement conducteur avec une pièce de contact (15) disposée à l'une de ses extrémités;
- un second bras de contact (16) électriquement conducteur avec une pièce de contact (17) disposée à l'une de ses extrémités;
- une culasse ferromagnétique de forme en U, entourant la partie parcourue par le courant du second bras de contact (16) et servant à produire une force agissant dans le sens de la séparation des bras de contact; et
- un support (18) monté basculant et servant à recevoir et permettre le basculement du second bras de contact (16), caractérisé en ce que la culasse ferromagnétique est réalisée comme support (18) du second bras de contact (16) et que, dans ce but, les parties latérales (20, 22) du support (18) sont dimensionnées pour permettre un angle de basculement du second bras de contact (16), angle qui est prévu pour la séparation en fonction du courant des bras de contact (14,16).
2. Système selon la revendication 1, caractérisé en ce que l'une au moins des parties latérales (20) du support (18) présente une surface de came (31) pour un galet (40) disposé sur le second bras de contact (16), où il est déplaçable dans le sens de la longueur de ce bras, et qui est sollicité par la force d'un ressort.
3. Système selon la revendication 2, caractérisé en ce que la surface de came (31) présente un cran (32) dans lequel est situé le galet (40) à la position normale du bras de contact (16) et, à la suite de ce cran (32), un tronçon (35) dont le rayon diminue par rapport à l'appui du ressort (axe de montage 30) sur le support (18), ainsi qu'un tronçon (37) dont le rayon croît.
4. Système selon la revendication 1, caractérisé en ce que la partie médiane (24) du support (18) est réalisée comme élément d'appui pour une pince (28) qui doit être fixée sur la partie médiane (24) en vue de la liaison d'une traverse à deux ou davantage de systèmes de contacts (12).
5. Système selon la revendication 1, caractérisé en ce que le premier bras de contact (14) forme avec le second bras de contact 16), à la position fermée du système de contacts (12), un trajet de courant en forme de boucle en vue de l'obtention d'une force de répulsion électrodynamique.
EP85730126A 1984-09-28 1985-09-17 Assemblage de contact pour un interrupteur de puissance avec rupture dépendant du courant Expired EP0177437B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/656,150 US4594567A (en) 1984-09-28 1984-09-28 Circuit breaker contact arm assembly having a magnetic carrier
US656150 1984-09-28

Publications (3)

Publication Number Publication Date
EP0177437A2 EP0177437A2 (fr) 1986-04-09
EP0177437A3 EP0177437A3 (en) 1987-08-19
EP0177437B1 true EP0177437B1 (fr) 1989-12-06

Family

ID=24631854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85730126A Expired EP0177437B1 (fr) 1984-09-28 1985-09-17 Assemblage de contact pour un interrupteur de puissance avec rupture dépendant du courant

Country Status (5)

Country Link
US (1) US4594567A (fr)
EP (1) EP0177437B1 (fr)
JP (1) JPS6185742A (fr)
CA (1) CA1241684A (fr)
DE (1) DE3574649D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3637913A1 (de) * 1986-11-06 1988-05-19 Licentia Gmbh Strombegrenzendes elektrisches schaltgeraet
US5361051A (en) * 1988-12-16 1994-11-01 Siemens Energy & Automation, Inc. Pivoting circuit breaker contact arm assembly
US5585609A (en) * 1994-09-28 1996-12-17 Siemens Energy & Automation, Inc. Circuit breaker with movable main contact multi-force-level biasing element
US5926081A (en) * 1997-09-23 1999-07-20 Siemens Energy & Automation, Inc. Circuit breaker having a cam structure which aids blow open operation
US5994988A (en) * 1997-09-23 1999-11-30 Siemens Energy & Automation, Inc. Movable contact structure for a circuit breaker, including crossbar and spring biased cam mechanism
US6252480B1 (en) * 2000-02-18 2001-06-26 Siemens Energy & Automation, Inc. Moving contact and crossbar assembly for a molded case circuit breaker
US6563407B2 (en) 2001-08-21 2003-05-13 Siemens Energy & Automation, Inc. Pivot joint for a movable contact arm in a molded case circuit breaker
ITBG20060053A1 (it) 2006-10-13 2008-04-14 Abb Service Srl Dispositivo di bassa tensione con equipaggio mobile ad alta tenuta elettrodinamica

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2128633A1 (de) * 1971-06-09 1973-01-04 Bbc Brown Boveri & Cie Selbstschalter mit magnetischer und elektrodynamischer kurzschlussausloesung
FR2185853B1 (fr) * 1972-05-26 1977-12-30 Merlin Gerin
US3887888A (en) * 1973-04-04 1975-06-03 Arrow Hart Inc High current switch
FR2421458A1 (fr) * 1978-03-31 1979-10-26 Merlin Gerin Disjoncteur multipolaire a dispositif electromagnetique d'ouverture rapide du contact mobile
US4409573A (en) * 1981-04-23 1983-10-11 Siemens-Allis, Inc. Electromagnetically actuated anti-rebound latch
US4488133A (en) * 1983-03-28 1984-12-11 Siemens-Allis, Inc. Contact assembly including spring loaded cam follower overcenter means

Also Published As

Publication number Publication date
US4594567A (en) 1986-06-10
EP0177437A2 (fr) 1986-04-09
CA1241684A (fr) 1988-09-06
JPS6185742A (ja) 1986-05-01
EP0177437A3 (en) 1987-08-19
DE3574649D1 (de) 1990-01-11

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