EP1668657A1 - Connecting bar arrangement for an electric switch and electric switch comprising a connecting bar arrangement - Google Patents

Connecting bar arrangement for an electric switch and electric switch comprising a connecting bar arrangement

Info

Publication number
EP1668657A1
EP1668657A1 EP04786836A EP04786836A EP1668657A1 EP 1668657 A1 EP1668657 A1 EP 1668657A1 EP 04786836 A EP04786836 A EP 04786836A EP 04786836 A EP04786836 A EP 04786836A EP 1668657 A1 EP1668657 A1 EP 1668657A1
Authority
EP
European Patent Office
Prior art keywords
rails
connection
escape
connecting bar
bar arrangement
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Withdrawn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
EP04786836A
Other languages
German (de)
French (fr)
Inventor
Michael Kruschke
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 EP1668657A1 publication Critical patent/EP1668657A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • 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
    • 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
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/40—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc

Definitions

  • the invention relates to a connecting rail arrangement for an electrical switch with aligned connecting rails.
  • the invention further relates to an electrical switch, in particular low-voltage circuit breakers with such a connecting bar arrangement.
  • connection rail arrangement and an electrical switch with such a generic connection rail arrangement are known for example from the document DE 100 54 497 AI.
  • this known electrical switch provides for moving switch contacts in the form of contact levers, which are assigned to outer contact areas of the switching elements of the connecting rails in the direction of escape, to be subjected to higher contact forces than contact levers which middle contact areas of the switching pieces of the connecting rails are assigned. This counteracts the stronger contact-lifting forces on the outside - due to the higher streamline concentration.
  • the invention is based on the object of counteracting these effects of current displacement in a different way.
  • this object is achieved in that a local reduction in the cross-sectional area of at least one of the connecting rails is provided for local streamline compression in the direction of escape.
  • connection rail arrangement In contrast to this, it is provided in the connection rail arrangement according to the invention that the at least one recess extends transversely to the escape direction through the entire at least one of the connection rails.
  • the phase positions of the aligned connection rails are offset such that in the outer sections of the connection rail in the direction of escape a higher streamline concentration, i.e. a higher current load occurs. It is therefore advantageous if the at least one recess is provided in an outer first region of the at least one of the connecting rails in the direction of escape, or if a second recess is additionally provided in an outer second region of the at least one of the connecting rails opposite the first region.
  • the at least one recesses extends near the end face. This ensures that the streamlines due to the current displacement (skin or skin effect as well as proximity or proximity effect) to To reach the end face, do not concentrate again in the two outer areas of the connecting rail in the direction of escape.
  • a particularly good compensation of the current distribution can be achieved if the at least one recess extends in the direction of escape essentially over a quarter of the at least one of the connecting rails.
  • connection rail arrangement is preferably provided in electrical switches, in particular low-voltage circuit breakers, in which the connection rails of individual poles are arranged closely adjacent to one another.
  • Figure 1 is a schematic representation of an electrical switch with a connection rail arrangement
  • Figure 2 shows a connection rail arrangement for a three-pole electrical switch.
  • FIG. 1 shows an electrical switch 1 in the form of a low-voltage circuit breaker with a switch contact system and an associated arc quenching chamber 2.
  • the switch contact system consists of a fixed switch contact arrangement 3 and a movable switch contact arrangement 4.
  • the movable switch contact arrangement 4 has a pivotable contact carrier 5 and several movable
  • Switch contacts 6 in the form of contact levers.
  • the movable switching contacts 6 can be pivoted parallel to one another and are spring-loaded under tension by means of contact force springs 7 supported the contact carrier 5.
  • the movable switching contact arrangement 4 is coupled in a known manner to a switching shaft 9 via a first lever arrangement 8, which is only indicated schematically in FIG.
  • the switching shaft 9 also serves to drive further switching contact systems, not shown, which are arranged parallel to the switching contact system shown. It is to be transferred from an OFF position, in which the switch contact system is open, to an ON position, in which the switch contact system is closed, by means of a drive device 10.
  • the drive device 10 has a drive 12 provided with a storage spring 11, a second lever arrangement 13 coupling the drive 12 to the control shaft 9 and a switch lock 14 for latching the movable switch contact arrangements when the switch contact systems are closed or for latching the tensioned spring 11 on.
  • connection rail arrangement which has three upper connection rails 20 arranged in alignment (cf. FIG. 1).
  • Each of the three connecting rails 20 is provided on its flat end face 21 facing its movable switching contact arrangement 4 with switching pieces 22 which, when the switching contact system is closed, bear against switching pieces 23 of the movable switching contacts 6 under the force of the contact force springs 7.
  • Each of the connecting rails 20 has two recesses 27, 28 in the form of slots in the outer regions 25, 26 in the direction of escape, which are parallel to the near the end faces 21 End faces 21 run and which are each transverse to
  • connection rail arrangement if the recesses 27, 28 of each of the connection rails 20 are approximately 8 mm apart from the respective end face 21 and in the form of slots with a width of approximately 2 mm are formed, the slots in the direction of escape 29 each extending about a quarter of the width of the connecting rails.
  • the remaining cross section 33 then corresponds approximately to the entire cross section of power cables 34 (cf. FIG. 1), which connect the movable switch contacts 6 of the associated movable switch contact arrangement to a lower connecting bar 35 (cf. FIG. 1).
  • the incisions can be made by sawing or electro-eroding.
  • heat-resistant fillers are also suitable for filling the recesses.
  • closely adjacent bores can also be provided for local streamline compression in the direction of escape, which extend in the outer areas of the connection rails in the direction of the escape near the end faces transverse to the direction of escape through the entire connection rail. In this case it is not necessary to add a filler.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Contacts (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)

Abstract

The invention relates to a connecting bar arrangement for an electric switch, comprising aligned connecting bars (20). The invention also relates to an electric switch (1), especially a low-voltage power switch comprising said type of connecting bar arrangement. A localised reduction of the cross-sectional area of at least one of the connecting bars (20) for localised compression of current lines in the direction of alignment (29) is provided in order act against the Kelvin effect, especially to prevent, more particularly, an increased use of contact pieces (22, 23) based on the removal of switching contacts. Recesses (27, 28) in the form of slots are arranged in external areas (25, 26, in the direction of alignment (29) of the connecting bars (20), close to the front surfaces (21). Said recesses are parallel to the front surfaces (21) and extend in a transversal manner in relation to the direction of alignment (29) over the surface of each respective connection bar (20).

Description

Beschreibungdescription
Anschlussschienen-Anordnung für einen elektrischen Schalter und elektrischer Schalter mit einer Anschlussschienen- AnordnungConnection rail arrangement for an electrical switch and electrical switch with a connection rail arrangement
Die Erfindung bezieht sich auf eine Anschlussschienen- Anordnung für einen elektrischen Schalter mit fluchtend angeordneten Anschlussschienen. Die Erfindung bezieht sich wei- terhin auf einen elektrischen Schalter, insbesondere Nie- derspannungs-Leistungsschalter mit einer derartigen An- schlussschienen-Anordnung .The invention relates to a connecting rail arrangement for an electrical switch with aligned connecting rails. The invention further relates to an electrical switch, in particular low-voltage circuit breakers with such a connecting bar arrangement.
In Niederspannungs-Leistungsschaltern insbesondere für hohe Nennströme (beispielsweise 6300 A) tritt in Schaltkontaktsystemen eng benachbarter Schaltpole durch gegenseitige Beeinflussung der Anschlussschienen eine erhebliche Stromverdrängung auf. Diese Stromverdrängung bewirkt eine ungleiche Verteilung des Stromes (und damit der Stromlinien) über die Querschnittsfläche der Anschlussschienen; und zwar insbesondere bei der Beanspruchung durch Stoßstrom. Dabei kommt es zum Abheben einander zugeordneter Schaltkontakte und entsprechend zu einem erheblichen Abrand an Schaltstücken der Schaltkontakte .In low-voltage circuit breakers, in particular for high nominal currents (for example 6300 A), a considerable current displacement occurs in switching contact systems of closely adjacent switching poles due to the mutual influence of the connection rails. This current displacement causes an uneven distribution of the current (and thus the streamlines) over the cross-sectional area of the connection rails; in particular when subjected to surge current. This results in the switching contacts assigned to one another being lifted off, and accordingly in a considerable amount of switching pieces of the switching contacts.
Eine gattungsgemäße Anschlussschienen-Anordnung sowie ein elektrischer Schalter mit einer derartigen gattungsgemäßen Anschlussschienen-Anordnung sind beispielsweise aus der Druckschrift DE 100 54 497 AI bekannt. - Dabei ist bekannt, dass es in Abhängigkeit von der örtlichen Lage der Anschlussschienen und ihrer Phasenlage in den Anschlussschienen zur Stromverdrängung (Skin- oder Hauteffekt sowie Nah- oder Pro- ximityeffekt) kommt. Um den Auswirkungen dieser Stromverdrän- gung insbesondere in fluchtend sehr eng nebeneinander liegenden Anschlussschienen entgegenzuwirken, ist bei diesem bekannten elektrischen Schalter vorgesehen, bewegbare Schaltkontakte in Form von Kontakthebeln, die in Fluchtrichtung äu- ßeren Kontaktbereichen der Schaltstücke der Anschlussschienen zugeordnet sind, mit höheren Kontaktkräften zu beaufschlagen als Kontakthebel, die den mittleren Kontaktbereichen der Schaltstücke der Anschlussschienen zugeordneten sind. Damit wird den außen - aufgrund der höheren Stromlinienkonzentrati- on - stärkeren kontaktabhebenden Kräften entgegengewirkt.A generic connection rail arrangement and an electrical switch with such a generic connection rail arrangement are known for example from the document DE 100 54 497 AI. - It is known that depending on the local position of the connection rails and their phase position in the connection rails, there is a current displacement (skin or skin effect as well as proximity or proximity effect). To avoid the effects of this To counteract supply particularly in aligned very closely adjacent connecting rails, this known electrical switch provides for moving switch contacts in the form of contact levers, which are assigned to outer contact areas of the switching elements of the connecting rails in the direction of escape, to be subjected to higher contact forces than contact levers which middle contact areas of the switching pieces of the connecting rails are assigned. This counteracts the stronger contact-lifting forces on the outside - due to the higher streamline concentration.
Ausgehend von einer Anschlussschienen-Anordnung mit den Merkmalen des Oberbegriffes des Patentanspruches 1 liegt der Erfindung die Aufgabe zu Grunde, diesen Auswirkungen der Strom- Verdrängung auf andere Weise entgegenzuwirken.Starting from a connecting bar arrangement with the features of the preamble of claim 1, the invention is based on the object of counteracting these effects of current displacement in a different way.
Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, dass eine örtliche Verminderung der Querschnittsfläche zumindest einer der Anschlussschienen zur örtlichen Stromlinienkomprimierung in Fluchtrichtung vorgesehen ist.According to the invention, this object is achieved in that a local reduction in the cross-sectional area of at least one of the connecting rails is provided for local streamline compression in the direction of escape.
Eine derartige Gestaltung gestattet es den Strom örtlich aus Bereichen der größten Stromkonzentration in Bereiche der größten Stromverdrängung umzulenken. Dieses Umlenken führt zu einer Verlängerung der Strompfade in den Bereichen der größ- ten Stromkonzentration und damit zu einer Abschwächung der Konzentration des Stromes in diesen Bereichen. Die örtliche Verminderung der Querschnittsfläche bewirkt daher einen Ausgleich der Stromverteilung über den Querschnitt der Anschlussschiene; und zwar in Stromrichtung gesehen insbesonde- re in einem Abschnitt der Anschlussschiene, der sich unmittelbar an den in der Querschnittsfläche verminderten Abschnitt anschließt. An sich ist eine Anschlussschienen-Anordnung bekannt, bei derSuch a design allows the current to be diverted locally from areas of greatest current concentration to areas of greatest current displacement. This deflection leads to a lengthening of the current paths in the areas of the greatest current concentration and thus to a weakening of the concentration of the current in these areas. The local reduction in the cross-sectional area therefore brings about a compensation of the current distribution over the cross-section of the connecting rail; specifically seen in the direction of the current, in particular in a section of the connecting bar which directly adjoins the section with a reduced cross-sectional area. A connecting rail arrangement is known per se in which
Stirnflächen der Anschlussschienen parallel zur Fluchtrichtung verlaufen und bei der die Anschlussschienen zum Umlenken des Stromes mit zumindest einer im wesentlichen parallel zu den Stirnflächen verlaufenden Ausnehmung versehen sind (DE 101 44 440 CI).- Bei dieser bekannten Anschlussschienen- Anordnung sind die Ausnehmungen jedoch zur Stromlinienkomprimierung quer zur Fluchtrichtung vorgesehen, um den Strom nahe der mit Schaltstücken versehenen Stirnflächen (feststehende Schaltkontakte) parallel zu den Stirnflächen und damit parallel zu dem Strom in zugeordneten bewegbaren Schaltkontakten zu führen, d.h. um eine anziehende Wirkung zwischen den Schaltkontakten zu erzielen. Im Gegensatz hierzu ist bei der Anschlussschienen-Anordnung gemäß der Erfindung vorgesehen, dass sich die zumindest eine Ausnehmung quer zur Fluchtrichtung durch die gesamte zumindest eine der Anschlussschienen erstreckt.End faces of the connecting rails run parallel to the direction of escape and in which the connecting rails for deflecting the flow are provided with at least one recess running essentially parallel to the end faces (DE 101 44 440 CI). However, in this known connecting rail arrangement, the recesses are for streamlined compression provided transversely to the direction of escape in order to conduct the current near the end faces provided with switching pieces (fixed switching contacts) parallel to the end faces and thus parallel to the current in assigned movable switching contacts, ie to achieve an attractive effect between the switch contacts. In contrast to this, it is provided in the connection rail arrangement according to the invention that the at least one recess extends transversely to the escape direction through the entire at least one of the connection rails.
Üblicherweise sind die Phasenlagen der fluchtend angeordneten Anschlussschienen derart versetzt, dass in den in Fluchtrichtung äußeren Abschnitten der Anschlussschiene eine höhere Stromlinienkonzentration, d.h. eine höhere Strombelastung auftritt. Daher ist es vorteilhaft, wenn die zumindest eine Ausnehmung in einem in Fluchtrichtung äußeren ersten Bereich der zumindest einen der Anschlussschienen vorgesehen ist bzw. wenn zusätzlich eine zweite Ausnehmung in einem dem ersten Bereich gegenüberliegenden, äußeren zweiten Bereich der zumindest einen der Anschlussschienen vorgesehen ist.Usually, the phase positions of the aligned connection rails are offset such that in the outer sections of the connection rail in the direction of escape a higher streamline concentration, i.e. a higher current load occurs. It is therefore advantageous if the at least one recess is provided in an outer first region of the at least one of the connecting rails in the direction of escape, or if a second recess is additionally provided in an outer second region of the at least one of the connecting rails opposite the first region.
Vorteilhaft ist es, wenn sich die zumindest eine Ausnehmungen nahe der Stirnfläche erstreckt. Dadurch wird sichergestellt, dass sich die Stromlinien aufgrund der Stromverdrängung (Skin- oder Hauteffekt sowie Nah- oder Proximityeffekt) bis zum Erreichen der Stirnfläche nicht wieder in den in Fluchtrichtung äußeren beiden Bereichen der Anschlussschiene konzentrieren.It is advantageous if the at least one recesses extends near the end face. This ensures that the streamlines due to the current displacement (skin or skin effect as well as proximity or proximity effect) to To reach the end face, do not concentrate again in the two outer areas of the connecting rail in the direction of escape.
Ein besonders guter Ausgleich der Stromverteilung lässt sich erzielen, wenn sich die zumindest eine Ausnehmung in Fluchtrichtung im Wesentlichen über ein Viertel der zumindest einen der Anschlussschiene erstreckt.A particularly good compensation of the current distribution can be achieved if the at least one recess extends in the direction of escape essentially over a quarter of the at least one of the connecting rails.
Die neue Anschlussschienen-Anordnung ist bevorzugt in Elektrischen Schaltern, insbesondere Niederspannungs-Leistungs- schaltern vorgesehen, bei denen die Anschlussschienen einzelner Pole eng benachbart angeordnet sind.The new connection rail arrangement is preferably provided in electrical switches, in particular low-voltage circuit breakers, in which the connection rails of individual poles are arranged closely adjacent to one another.
Ein Ausführungsbeispiel der Erfindung ist in den Figuren 1 und 2 dargestellt. Dabei zeigen:An embodiment of the invention is shown in Figures 1 and 2. Show:
Figur 1 eine schematische Darstellung eines elektrischen Schalters mit einer Anschlussschienen-Anordnung undFigure 1 is a schematic representation of an electrical switch with a connection rail arrangement and
Figur 2 eine Anschlussschienen-Anordnung für einen dreipoligen elektrischen Schalter.Figure 2 shows a connection rail arrangement for a three-pole electrical switch.
Die Figur 1 zeigt einen elektrischen Schalter 1 in Form eines Niederspannungs-Leistungsschalters mit einem Schaltkontaktsystem und einer zugeordneten Lichtbogen-Löschkammer 2. Das Schaltkontaktsystem besteht aus einer feststehenden Schaltkontaktanordnung 3 und einer beweglichen Schaltkontaktanordnung 4. Die bewegliche Schaltkontaktanordnung 4 weist dabei einen schwenkbaren Kontaktträger 5 und mehrere bewegbareFIG. 1 shows an electrical switch 1 in the form of a low-voltage circuit breaker with a switch contact system and an associated arc quenching chamber 2. The switch contact system consists of a fixed switch contact arrangement 3 and a movable switch contact arrangement 4. The movable switch contact arrangement 4 has a pivotable contact carrier 5 and several movable
Schaltkontakte 6 in Form von Kontakthebeln auf. Die bewegbaren Schaltkontakte 6 sind parallel zueinander schwenkbar und mittels Kontaktkraft-Federn 7 unter Vorspannung federnd an dem Kontaktträger 5 abgestützt. Die bewegliche Schaltkontaktanordnung 4 ist in bekannter Weise über eine in der Figur 1 nur schematisch angedeutete erste Hebelanordnung 8 mit einer Schaltwelle 9 gekoppelt. Die Schaltwelle 9 dient gleichzeitig zum Antrieb nicht weiter dargestellter, parallel zu dem gezeigten Schaltkontaktsystem angeordneter weiterer Schaltkontaktsysteme. Sie ist mittels einer Antriebsvorrichtung 10 aus einer AUS-Position, bei der das Schaltkontaktsystem offen ist, in eine EIN-Position, bei der das Schaltkontaktsystem geschlossen ist, zu überführen. Beim Überführen der Schaltwelle 9 in ihre EIN-Position werden die Kontaktkraft-Federn 7 weiter gespannt, so dass ihre Kraft in die zur AUS-Position weisende Schwenkrichtung der Schaltwelle 9 wirkt. Die Antriebsvorrichtung 10 weist einen mit einer Speicher-Feder 11 versehenen Antrieb 12, eine den Antrieb 12 mit der Schaltwelle 9 koppelnde zweite Hebelanordnung 13 und ein Schaltschloss 14 zum Verklinken der beweglichen Schaltkontaktanordnungen bei geschlossenen Schaltkontakt-Systemen bzw. zum Verklinken der gespannten Speicher-Feder 11 auf.Switch contacts 6 in the form of contact levers. The movable switching contacts 6 can be pivoted parallel to one another and are spring-loaded under tension by means of contact force springs 7 supported the contact carrier 5. The movable switching contact arrangement 4 is coupled in a known manner to a switching shaft 9 via a first lever arrangement 8, which is only indicated schematically in FIG. The switching shaft 9 also serves to drive further switching contact systems, not shown, which are arranged parallel to the switching contact system shown. It is to be transferred from an OFF position, in which the switch contact system is open, to an ON position, in which the switch contact system is closed, by means of a drive device 10. When the selector shaft 9 is moved into its ON position, the contact force springs 7 are tensioned further, so that their force acts in the pivoting direction of the selector shaft 9 pointing towards the OFF position. The drive device 10 has a drive 12 provided with a storage spring 11, a second lever arrangement 13 coupling the drive 12 to the control shaft 9 and a switch lock 14 for latching the movable switch contact arrangements when the switch contact systems are closed or for latching the tensioned spring 11 on.
Gemäß der Figur 2 bilden drei feststehende Schaltkontaktanordnungen 3 eine Anschlussschienen-Anordnung, die drei fluchtend angeordnete, obere Anschlussschienen 20 (vgl. Figur 1) aufweist. Dabei ist jede der drei Anschlussschienen 20 an ih- rer der beweglichen Schaltkontaktanordnung 4 zugewandten flachen Stirnfläche 21 mit Schaltstücken 22 versehen, die bei geschlossenem Schaltkontaktsystem unter der Kraft der Kontaktkraft-Federn 7 an Schaltstücken 23 der bewegbaren Schaltkontakte 6 anliegen.According to FIG. 2, three fixed switch contact arrangements 3 form a connection rail arrangement which has three upper connection rails 20 arranged in alignment (cf. FIG. 1). Each of the three connecting rails 20 is provided on its flat end face 21 facing its movable switching contact arrangement 4 with switching pieces 22 which, when the switching contact system is closed, bear against switching pieces 23 of the movable switching contacts 6 under the force of the contact force springs 7.
Jede der Anschlussschienen 20 weist in den in Fluchtrichtung äußeren Bereichen 25, 26 zwei Ausnehmungen 27, 28 in Form von Schlitzen auf, die nahe der Stirnflächen 21 parallel zu den Stirnflächen 21 verlaufen und die sich jeweils quer zurEach of the connecting rails 20 has two recesses 27, 28 in the form of slots in the outer regions 25, 26 in the direction of escape, which are parallel to the near the end faces 21 End faces 21 run and which are each transverse to
Fluchtrichtung 29 durch die gesamte Anschlussschiene 20 erstrecken. Das Einbringen dieser Ausnehmungen führt zu einer örtlichen Verminderung der Querschnittsfläche der Anschluss- schienen. Durch diese Ausnehmungen 27, 28 werden die Auswirkungen der Stromverdrängung im Wesentlichen behoben; und zwar dadurch, dass die Stromverteilung vergleichmäßigt wird. Der Querschnitt der Anschlussschienen wird derart eingeschnürt, dass der Weg des Stromes in der jeweiligen Anschlussschiene zu den in Fluchtrichtung äußeren Kontaktbereichen 30, 31 der Schaltstücke der feststehenden Schaltkontaktanordnungen länger ist als zu deren mittleren Kontaktbereich 32. Die Konzentration des Stromes auf die äußeren Kontaktbereiche 30, 31 wird somit abgeschwächt. In die Ausnehmungen wurde Flachmate- rial aus Glasfaser-Kunststoff eingebracht.Extend direction of escape 29 through the entire connecting rail 20. The introduction of these recesses leads to a local reduction in the cross-sectional area of the connecting rails. These recesses 27, 28 essentially eliminate the effects of current displacement; by making the current distribution even. The cross section of the connecting rails is constricted in such a way that the path of the current in the respective connecting rail to the outer contact regions 30, 31 of the switching pieces of the fixed switching contact arrangements in the direction of escape is longer than to their central contact region 32. The concentration of the current on the outer contact regions 30, 31 is thus weakened. Flat material made of glass fiber plastic was introduced into the recesses.
Gute Ergebnisse in Hinblick auf eine ausgeglichene Stromverteilung werden mit der neuen Anschlussschienen-Anordnung erzielt, wenn die Ausnehmungen 27, 28 jeder der Anschlussschie- nen 20 etwa einen Abstand von 8mm zur jeweiligen Stirnfläche 21 aufweisen und in Form von Schlitzen mit einer Breite von etwa 2mm ausgebildet sind, wobei sich die Schlitze in der Fluchtrichtung 29 jeweils etwa über ein Viertel der Breite der Anschlussschienen erstrecken. Der verbleibende Quer- schnitt 33 entspricht dann etwa dem gesamten Querschnitt von Stromseilen 34 (vgl. Figur 1), die die bewegbaren Schaltkontakte 6 der zugeordneten beweglichen Schaltkontaktanordnung mit einer unteren Anschlussschiene 35 (vgl. Figur 1) verbinden. Stoßstromversuche, die mit einer derartigen Anschluss- schienen-Anordnung durchgeführt wurden, haben gezeigt, dass im Vergleich zu herkömmlichen Anschlussschienen-Anordnungen, bei denen keine örtliche Verminderung der Querschnittsfläche der Anschlussschienen zur örtlichen Stromlinienkomprimierung in Fluchtrichtung vorgesehen ist, die mittleren Kontaktbereiche der Schaltstücke besser ausgenutzt und die in Fluchtrichtung äußeren Kontaktbereiche weniger belastet werden.Good results with regard to a balanced current distribution are achieved with the new connection rail arrangement if the recesses 27, 28 of each of the connection rails 20 are approximately 8 mm apart from the respective end face 21 and in the form of slots with a width of approximately 2 mm are formed, the slots in the direction of escape 29 each extending about a quarter of the width of the connecting rails. The remaining cross section 33 then corresponds approximately to the entire cross section of power cables 34 (cf. FIG. 1), which connect the movable switch contacts 6 of the associated movable switch contact arrangement to a lower connecting bar 35 (cf. FIG. 1). Surge current tests that have been carried out with such a connecting rail arrangement have shown that compared to conventional connecting rail arrangements in which there is no local reduction in the cross-sectional area of the connecting rails for local streamline compression is provided in the direction of escape, the middle contact areas of the switching pieces are better utilized and the outer contact areas in the direction of escape are less stressed.
Die Einschnitte können durch Sägen oder Elektro-Erodieren hergestellt werden. Zum Ausfüllen der Ausnehmungen eignen sich neben plattenförmigen Materialien auch wärmebeständige Füllmassen.The incisions can be made by sawing or electro-eroding. In addition to plate-shaped materials, heat-resistant fillers are also suitable for filling the recesses.
Anstelle der Schlitze können zur örtlichen Stromlinienkomprimierung in Fluchtrichtung auch dicht benachbarte Bohrungen vorgesehen sein, die sich in den in Fluchrichtung äußeren Bereichen der Anschlussschienen nahe der Stirnseiten quer zur Fluchtrichtung jeweils durch die gesamte Anschlussschiene erstrecken. In diesem Fall ist das Einbringen eines Füllmaterials entbehrlich. Instead of the slots, closely adjacent bores can also be provided for local streamline compression in the direction of escape, which extend in the outer areas of the connection rails in the direction of the escape near the end faces transverse to the direction of escape through the entire connection rail. In this case it is not necessary to add a filler.

Claims

Patentansprüche claims
1. Anschlussschienen-Anordnung für einen elektrischen Schalter mit fluchtend angeordneten Anschlussschienen (20) , d a d u r c h g e k e n n z e i c h n e t, d a s s eine örtliche Verminderung der Querschnittsfläche zumindest einer der Anschlussschienen (20) zur örtlichen Stromlinienkomprimierung in Fluchtrichtung (29) vorgese- hen ist.1. Connection rail arrangement for an electrical switch with aligned connection rails (20), so that a local reduction in the cross-sectional area of at least one of the connection rails (20) is provided for local streamline compression in the direction of escape (29).
2. Anschlussschienen-Anordnung nach Anspruch 1, bei der Stirnflächen (21) der Anschlussschienen (20) parallel zur Fluchtrichtung (29) verlaufen und - bei der die zumindest eine der Anschlussschienen (20) zum Umlenken des Stromes mit zumindest einer im Wesentlichen parallel zu den Stirnflächen (21) verlaufenden Ausnehmung (27) versehen ist, d a d u r c h g e k e n n z e i c h n e t, d a s s - sich die zumindest eine Ausnehmung (27) quer zur Fluchtrichtung (29) durch die gesamte zumindest eine der Anschlussschienen (20) erstreckt.2. Connection rail arrangement according to claim 1, in which the end faces (21) of the connection rails (20) run parallel to the escape direction (29) and - in which the at least one of the connection rails (20) for deflecting the current with at least one substantially parallel to the end faces (21) extending recess (27), characterized in that - the at least one recess (27) extends transversely to the direction of escape (29) through the entire at least one of the connecting rails (20).
3. Anschlussschienen-Anordnung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, d a s s die zumindest eine Ausnehmung (27) in einem in Fluchtrichtung (29) äußeren ersten Bereich (25) der zumindest einen der Anschlussschienen (20) vorgesehen ist.3. Connection rail arrangement according to claim 2, d a d u r c h g e k e n e e c e n c e n e t, that the at least one recess (27) in an escape direction (29) outer first area (25) of the at least one of the connection rails (20) is provided.
4. Anschlussschienen-Anordnung nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t, d a s s eine zweite Ausnehmung (28) in einem dem ersten Bereich (25) gegenüberliegenden, zweiten Bereich (26) der zumindest einen der Anschlussschienen vorgesehen ist.4. Connection rail arrangement according to claim 3, characterized in that a second recess (28) in a second region (26) opposite the first region (25) and at least one of the connecting rails is provided.
5. Anschlussschienen-Anordnung nach einem der Ansprüche 2 bis 4, d a d u r c h g e k e n n z e i c h n e t, d a s s sich die zumindest eine Ausnehmungen (27) nahe der Stirnfläche (21) erstreckt.5. Connection rail arrangement according to one of claims 2 to 4, d a d u r c h g e k e n n z e i c h n e t, that a s s extends the at least one recesses (27) near the end face (21).
6. Anschlussschienen-Anordnung nach einem der Ansprüche 2 bis 5, d a d u r c h g e k e n n z e i c h n e t, d a s s sich die zumindest eine Ausnehmung (27) in Fluchtrichtung (29) im Wesentlichen über ein Viertel der zumindest einen der Anschlussschienen (20) erstreckt.6. Connection rail arrangement according to one of claims 2 to 5, d a d u r c h g e k e n n z e i c h n e t, that the at least one recess (27) in the direction of escape (29) extends substantially over a quarter of the at least one of the connection rails (20).
7. Elektrischer Schalter (1), insbesondere Niederspannungs- Leistungsschalter mit einer Anschlussschienen-Anordnung, d a d u r c h g e k e n n z e i c h n e t, d a s s die Anschlussschienen-Anordnung nach einem der Ansprüche 1 bis 6 ausgebildet ist. 7. Electrical switch (1), in particular low-voltage circuit breaker with a connecting bar arrangement, that is, the connecting bar arrangement is designed according to one of claims 1 to 6, d a d u r c h g e k e n z e i c h n e t.
EP04786836A 2003-09-30 2004-09-17 Connecting bar arrangement for an electric switch and electric switch comprising a connecting bar arrangement Withdrawn EP1668657A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10346361A DE10346361B3 (en) 2003-09-30 2003-09-30 Terminal rail device for electrical LV switch, has at least one terminal rail provided with localized reduction in its cross-section for compression of current lines
PCT/DE2004/002120 WO2005034155A1 (en) 2003-09-30 2004-09-17 Connecting bar arrangement for an electric switch and electric switch comprising a connecting bar arrangement

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EP1668657A1 true EP1668657A1 (en) 2006-06-14

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EP04786836A Withdrawn EP1668657A1 (en) 2003-09-30 2004-09-17 Connecting bar arrangement for an electric switch and electric switch comprising a connecting bar arrangement

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US (1) US20070209827A1 (en)
EP (1) EP1668657A1 (en)
CN (1) CN100511521C (en)
DE (1) DE10346361B3 (en)
HK (1) HK1093817A1 (en)
WO (1) WO2005034155A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2485353A1 (en) * 2011-02-03 2012-08-08 ABB Technology AG Electrical connection assembly for an electricity distribution system of a high and/or medium voltage assembly
US20160240329A1 (en) * 2015-02-17 2016-08-18 General Electric Company Circuit breaker including current path geometries that increase contact popping level

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Publication number Priority date Publication date Assignee Title
DE588293C (en) 1931-05-30 1933-11-20 Aeg Electrical switch or circuit breaker with block contacts for alternating current
US5341191A (en) 1991-10-18 1994-08-23 Eaton Corporation Molded case current limiting circuit breaker
DE10054497A1 (en) * 2000-10-31 2002-05-02 Siemens Ag Switch contact arrangement for low-voltage circuit breakers
DE10144440C1 (en) * 2001-09-06 2002-08-29 Siemens Ag Switching contact arrangement with a device for amplifying a contact force acting between switching contacts

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005034155A1 *

Also Published As

Publication number Publication date
DE10346361B3 (en) 2005-02-03
CN1860571A (en) 2006-11-08
WO2005034155A1 (en) 2005-04-14
HK1093817A1 (en) 2007-03-09
CN100511521C (en) 2009-07-08
US20070209827A1 (en) 2007-09-13

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