EP3127131B1 - Multipolar power contactor - Google Patents

Multipolar power contactor Download PDF

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Publication number
EP3127131B1
EP3127131B1 EP15701099.2A EP15701099A EP3127131B1 EP 3127131 B1 EP3127131 B1 EP 3127131B1 EP 15701099 A EP15701099 A EP 15701099A EP 3127131 B1 EP3127131 B1 EP 3127131B1
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EP
European Patent Office
Prior art keywords
power contactor
barrier
contact
armature
movable
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EP15701099.2A
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German (de)
French (fr)
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EP3127131A1 (en
Inventor
Robert Kralik
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Schaltbau GmbH
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Schaltbau GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/08—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/38—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
    • 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
    • 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
    • H01H2009/305—Means for extinguishing or preventing arc between current-carrying parts including means for screening for arc gases as protection of mechanism against hot arc gases or for keeping arc gases in the arc chamber

Definitions

  • a generic power contactor comprises an electromagnetic drive, a movable armature of the drive, and at least two movable contacts arranged side by side and connected to the armature.
  • the movable contacts are assigned corresponding fixed contacts of the power contactor.
  • the armature is from an open position in which the movable contacts and the fixed contacts do not touch each other, transferred to a closed position in which the movable contacts come into contact with the fixed contacts, also in the generic contactor each contact point, consisting of movable Contact and corresponding fixed contact, assigned to an arc quenching device.
  • a plasma barrier is disposed, wherein the plasma barrier has a first barrier and a second barrier, wherein one of the two barriers with the armature and the other of the two barriers with a fixed stationary part of the power contactor, and wherein the first barrier and second barrier in each position of the armature at least partially overlap between the open position and the closed position.
  • Generic power contactors are used in particular as motor contactors in railcars. Power contactors used in railcars must be able to reliably switch particularly high outputs. Due to increasingly powerful engines, the power requirements of the motor contactors used are also growing. In particular, incidents must also be taken into account. For example, it may happen that a thyristor breaks down in the converter and thus generates a short circuit. In case of failure, the electric motor of the rail car acts as a generator, generating several 100 KW of power. The power must be switched off safely and reliably with the contactor. The same applies if the fault does not occur in the inverter but in the contactor itself. The frequencies to be switched are in the range between 50 Hz and 400 Hz.
  • a multi-pole power contactor according to the preamble of independent claim 1 is made US Pat. No. 6,417,749 B1 known. Related art is also out US 6,013,889 A known.
  • Object of the present invention is to improve the contactor of the generic type and to increase the switching capability.
  • the armature is connected to an actuating axis of metal, wherein the actuating axis is at least partially surrounded by a fixed insulating sleeve, wherein the actuating axis is at least partially surrounded by a relative to the fixed insulating sleeve moving insulating sleeve, wherein the moving insulating sleeve fixed to the actuating axis is connected, and wherein stationary insulating sleeve and moving insulating sleeve cooperate telescopically.
  • the fixed insulating sleeve and the moving insulating sleeve act together in the manner of a labyrinth seal.
  • the fixed insulating sleeve thus forms a fixed component of the power contactor and is preferably attached to a resting on the yoke plate of the contactor insulating. In order to achieve an optimum sealing effect, the fixed insulating sleeve preferably terminates flush with the yoke plate. If the actuating axis is cylindrical, it makes sense to form the fixed insulating sleeve in a hollow cylinder. In principle, however, any other cross section can be selected which ensures a sufficient sealing effect.
  • the invention prevents plasma, which is generated when opening the contacts due to a switching arc, from a contact point or a chamber enclosing the contact point to an adjacent contact point or the associated chamber. This also prevents the switching arc from striking the adjacent contact point.
  • one of the two barriers is attached to a resting on the yoke plate of the contactor insulating or indirectly connected to the Jochplate. In order to achieve an optimum sealing effect, this barrier preferably ends flush with the yoke plate.
  • the barrier connected to the anchor may be connected either directly or indirectly to the anchor. It is preferably connected via a contact carrier with the armature.
  • the distance between the first and second barrier in the covering area is less than 5 mm, more preferably less than 2 mm, and particularly preferably less than 1 mm.
  • the first barrier and the second barrier interact in the manner of a labyrinth seal. In this way, the plasma is particularly effectively prevented from getting from one contact point to an adjacent contact point.
  • the barriers are particularly simple and inexpensive to implement, if they are each formed by at least one plate.
  • the first barrier has at least two parallel plates, wherein at least one plate of the second barrier is arranged between the two parallel plates of the first barrier.
  • This will be a particularly effective labyrinth seal causes.
  • This embodiment is particularly easy to implement when the two parallel plates are fastened to a contact carrier connected to the armature or are part of the contact carrier.
  • the barriers are made of plastic or ceramic. These two materials are electrically non-conductive, which ensures that no electrical conductivity is produced between two adjacent contact points.
  • the power contactor comprises a yoke plate, wherein at least one component of the power contactor, which is mounted in close proximity to one of the contact points on the yoke plate, is secured by means of one or more plastic screws on the yoke plate.
  • the plastic screws are designed as high-strength plastic screws.
  • This embodiment is also suitable for screws that are not screwed into the yoke plate of the power contactor, but in any grounded component of the contactor.
  • the components to be fastened are, for example, housing parts or arc extinguishing chambers.
  • plastic screws is not only in the power contactor according to the invention but generally suitable for contactors.
  • the use of plastic screws for the above purposes is therefore a separate invention, although it leads to a further improvement in the switching capability in the power contactor according to the invention.
  • the yoke plate of the power contactor on the side facing the contact points at least partially provided with an insulating film. This prevents exposure to plasma and further reduces the risk of short circuits.
  • both the fixed insulating sleeve and the moving are Insulating sleeve made of plastic or ceramic. Further preferably, there is a very small distance between the two sleeves in order to optimize the sealing effect. A distance of less than 1 mm is preferred.
  • the movable contacts and / or the fixed contacts are each carried out with an arcing stirrer, wherein the arcs are at least partially tapered.
  • contacts with tapered arc guide are not only suitable for the power contactor according to the invention but generally for use in power contactors.
  • An embodiment with tapered Lichtbogenleithorn and the advantageous embodiments described below therefore represent a separate invention, however, equally contributes to the further optimization of the switching capability of the contactor according to the invention.
  • An arc guide is an extension of the contact which protrudes at an angle from the respective contact and via which the switching arc is conducted after its formation into the corresponding arc quenching device.
  • the arc guide grains are kept as narrow as the lifetime requirements permit.
  • the arc guide grains are preferably at least 25%, preferably at least 50%, narrower than the actual contact surface of the respective contact.
  • the arc guide is designed as a separate component and attached to the respective fixed contact or movable contact.
  • the attachment is done by riveting.
  • the arc guide grains are made of bronze. In this embodiment, there is a significantly higher lifetime of the arcing grains as compared to arcs of conventional design, which form together with the relevant contact a copper full part. It has been shown that conventional arc guide grains can break off early due to vibration load.
  • This embodiment lends itself, for example, when the yoke plate has an opening for a permanently connected to the armature or contact carrier connecting part, via which an arranged below the yoke plate auxiliary switch is actuated.
  • the sponge rubber mat is preferably designed such that it encloses the connecting part in a sealing manner.
  • This embodiment has the advantage that the plasma generated by the arc does not come into contact with the yoke plate or earthed components of the power contactor arranged thereunder via the opening, and thereby creates the risk of a short circuit.
  • FIG. 1 shows a partially sectioned oblique view of a power contactor according to the invention 1.
  • the power contactor is designed in three poles and comprises three juxtaposed switching points.
  • the armature 2 of the electromagnetic drive is over an actuating shaft 14 connected to a contact carrier 3.
  • the contact carrier 3 of the power contactor has three in FIG. 2 contact bridges shown in more detail 23, wherein each of the three contact bridge supports one of the three juxtaposed contact bridges 4 carries.
  • the three contact bridges form the moving contacts of the contactor.
  • One of the three contact bridge holders is arranged at the upper end of the actuating axis 14, which is actuated by the electromagnetic drive 2.
  • the contact carrier 3 is by means of the armature 2 of an open position in which the movable contacts 4 and the respective associated fixed contacts 5 do not touch each other, can be transferred to a closed position in which the movable contacts 4 come into contact with the fixed contacts 5 and thereby to make an electrical connection.
  • Opening the contacts creates a switching arc, which must be brought to extinction as quickly as possible, especially at high loads to be switched to prevent damage to the contacts or other components of the power contactor.
  • Each contact point consisting of movable contact 4 and corresponding fixed contact 5, is therefore associated with an arc quenching device.
  • the extinguishing chambers 6 of the arc quenching devices are for 4 of the total of 6 contact points in FIG. 1 shown.
  • a plasma barrier is provided between two adjacent contact points.
  • the plasma barrier consists essentially of partitions, which interact in the manner of a labyrinth seal and separate the corresponding contact points from each other.
  • each plasma barrier has two mutually parallel plates 7.1 and 7.2, which are firmly connected to the contact carrier 3.
  • Contact carrier 3 and plates preferably form a single component.
  • the two parallel aligned plates 7.1 and 7.2 include between them another plate 8, which is connected to a fixed component of the power contactor.
  • a corresponding plastic plate 22 is applied to the yoke plate 9 of the power contactor, of which the middle Plate 8 protrudes substantially perpendicular.
  • the plates 7.1 and 7.2 cover the middle plate 8 at least partially, in each position of the armature between the open and the closed position.
  • the plates 7.1 and 7.2 thus cooperate with the plate 8 in the manner of a labyrinth seal and thus effectively prevent plasma, which is generated at one of the contact points by a switching arc, moves to the adjacent switching point.
  • a plasma barrier is also provided in relation to the actuating axis 14 consisting of metal. It consists of a fixed insulating sleeve 12 which protrudes from the plastic plate 22, and a moving insulating sleeve 13, which is part of the contact carrier 3.
  • the fixed insulating sleeve 12 and the moving insulating sleeve 13 act telescopically and in the manner of a labyrinth seal together. There is a very short distance between the two sleeves, as well as between the plates 8 and 7.1 or 7.2.
  • an auxiliary switch is provided in the power contactor, which is actuated via the armature.
  • a connecting part 20 is connected to the contact carrier 3 for this purpose.
  • the connecting part 20 actuates a arranged below the yoke plate 9 auxiliary contact, and is therefore passed through an opening 19 in the yoke plate 9.
  • the opening 19 is sealed by means of a sponge rubber mat 21.
  • the foam rubber mat has a significantly smaller breakthrough compared to the opening 19 of the yoke plate 9, through which the connecting part 20 is passed.
  • FIG. 3 shows one of the three contact bridges 4 in detail.
  • the Lichtbogenleit technologicalner 15 are made of bronze and riveted to the contact bridge 4.
  • the rivet connections 17 are arranged in the middle region of the contact bridge.
  • the vertically projecting region 16 of the arc horns 15 is strongly tapered in order to achieve a narrowing of the magnetic field lines and thus an amplification of the electromagnetic blowing effect.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Description

Die vorliegende Erfindung betrifft ein mehrpoliges Leistungsschütz nach dem Oberbegriff des unabhängigen Anspruchs 1. Ein gattungsgemäßes Leistungsschütz umfasst einen elektromagnetischen Antrieb, einen bewegbaren Anker des Antriebs, und zumindest zwei bewegliche Kontakte, die nebeneinander angeordnet und mit dem Anker verbunden sind. Den beweglichen Kontakten sind entsprechende Festkontakte des Leistungsschützes zugeordnet. Der Anker ist von einer geöffneten Stellung, in der die beweglichen Kontakte und die Festkontakte einander nicht berühren, in eine geschlossene Stellung überführbar, in der die beweglichen Kontakte mit den Festkontakten in Berührung kommen, ferner ist bei dem gattungsgemäßen Leistungsschütz jeder Kontaktstelle, bestehend aus beweglichem Kontakt und entsprechendem Festkontakt, eine Lichtbogenlöscheinrichtung zugeordnet. Ferner ist bei dem gattungsgemäßen Leistungsschütz vorgesehen, dass zwischen zwei nebeneinander angeordneten beweglichen Kontakten benachbarter Pole eine Plasmasperre angeordnet ist, wobei die Plasmasperre eine erste Barriere sowie eine zweite Barriere aufweist, wobei eine der beiden Barrieren mit dem Anker und die andere der beiden Barrieren mit einem feststehenden Teil des Leistungsschützes verbunden ist, und wobei sich erste Barriere und zweite Barriere in jeder Stellung des Ankers zwischen geöffneter Stellung und geschlossener Stellung zumindest teilweise überdecken.The present invention relates to a multi-pole power contactor according to the preamble of independent claim 1. A generic power contactor comprises an electromagnetic drive, a movable armature of the drive, and at least two movable contacts arranged side by side and connected to the armature. The movable contacts are assigned corresponding fixed contacts of the power contactor. The armature is from an open position in which the movable contacts and the fixed contacts do not touch each other, transferred to a closed position in which the movable contacts come into contact with the fixed contacts, also in the generic contactor each contact point, consisting of movable Contact and corresponding fixed contact, assigned to an arc quenching device. Furthermore, it is provided in the generic power contactor that between two adjacent juxtaposed movable contacts of adjacent poles a plasma barrier is disposed, wherein the plasma barrier has a first barrier and a second barrier, wherein one of the two barriers with the armature and the other of the two barriers with a fixed stationary part of the power contactor, and wherein the first barrier and second barrier in each position of the armature at least partially overlap between the open position and the closed position.

Gattungsgemäße Leistungsschütze kommen insbesondere als Motorschütze in Bahntriebwagen zum Einsatz. Leistungsschütze, die in Bahntriebwagen eingesetzt werden, müssen besonders hohe Leistungen zuverlässig schalten können. Aufgrund immer leistungsfähiger werdender Motoren wachsen auch die Leistungsanforderungen der eingesetzten Motorschütze. Insbesondere müssen dabei auch Störfälle einkalkuliert werden. So kann es beispielsweise vorkommen, dass im Umrichter ein Thyristor durchschlägt und dadurch einen Kurzschluss erzeugt. Im Störfall wirkt der Elektromotor des Bahntriebwagens als Generator und erzeugt dabei mehrere 100 KW Leistung. Die Leistung muss mit dem Leistungsschütz sicher und zuverlässig abgeschaltet werden können. Das Gleiche gilt auch, falls die Störung nicht im Umrichter, sondern im Schütz selbst auftritt. Die zu schaltenden Frequenzen liegen dabei im Bereich zwischen 50 Hz und 400 Hz.Generic power contactors are used in particular as motor contactors in railcars. Power contactors used in railcars must be able to reliably switch particularly high outputs. Due to increasingly powerful engines, the power requirements of the motor contactors used are also growing. In particular, incidents must also be taken into account. For example, it may happen that a thyristor breaks down in the converter and thus generates a short circuit. In case of failure, the electric motor of the rail car acts as a generator, generating several 100 KW of power. The power must be switched off safely and reliably with the contactor. The same applies if the fault does not occur in the inverter but in the contactor itself. The frequencies to be switched are in the range between 50 Hz and 400 Hz.

Beim Öffnen der Kontakte entsteht ein Schaltlichtbogen. Bei den gattungsgemäßen Leistungsschützen sind deshalb Lichtbogenlöscheinrichtungen vorgesehen, in die der Schaltlichtbogen mittels eines Magnetfelds getrieben und dabei gelöscht wird. Je größer die zu schaltenden Leistungen sind, desto schwieriger ist es, den Schaltlichtbogen in kurzer Zeit zum Erlöschen zu bringen. Bei entsprechend hoher Leistung erzeugt der Schaltlichtbogen eine große Menge elektrisch leitfähigen Plasmas, das sich unter Druck im Geräteinneren verteilt. Aufgrund des Plasmas besteht die Gefahr, dass an verschiedenen Stellen im Leistungsschütz ein Kurzschluss erzeugt wird. Insbesondere kann das Plasma bewirken, dass der Schaltlichtbogen die Kontaktstellen benachbarter Pole kurzschließt oder auf Gerätemasse durchschlägt.When opening the contacts creates a switching arc. In the generic power contactors therefore arc quenching devices are provided in the switching arc driven by a magnetic field and thereby deleted. The greater the power to be switched, the more difficult it is to extinguish the switching arc in a short time. With correspondingly high power, the switching arc generates a large amount of electrically conductive plasma which distributes itself under pressure inside the device. Due to the plasma, there is a risk that a short circuit will be generated at various points in the contactor. In particular, the plasma can cause the switching arc short-circuits the contact points of adjacent poles or strikes device mass.

Ein mehrpoliges Leistungsschütz nach dem Oberbegriff des unabhängigen Anspruchs 1 ist aus US 6,417,749 B1 bekannt. Verwandter Stand der Technik ist ferner aus US 6,013,889 A bekannt.A multi-pole power contactor according to the preamble of independent claim 1 is made US Pat. No. 6,417,749 B1 known. Related art is also out US 6,013,889 A known.

Aufgabe der vorliegenden Erfindung ist es, das Leistungsschütz der gattungsgemäßen Art zu verbessern und die Schalttauglichkeit zu erhöhen.Object of the present invention is to improve the contactor of the generic type and to increase the switching capability.

Die Erfindung wird gelöst durch die Merkmale des unabhängigen Anspruchs 1.The invention is solved by the features of independent claim 1.

Gemäß der vorliegenden Erfindung ist der Anker mit einer Betätigungsachse aus Metall verbunden, wobei die Betätigungsachse zumindest teilweise von einer feststehenden Isolierhülse umgeben ist, wobei die Betätigungsachse zumindest teilweise von einer gegenüber der feststehenden Isolierhülse bewegten Isolierhülse umgeben ist, wobei die bewegte Isolierhülse fest mit der Betätigungsachse verbunden ist, und wobei feststehende Isolierhülse und bewegte Isolierhülse teleskopartig zusammenwirken. Die feststehende Isolierhülse und die bewegte Isolierhülse wirken nach Art einer Labyrinthdichtung zusammen. Dadurch wird verhindert, dass das Plasma, das durch den Lichtbogen erzeugt wird, mit der Betätigungsachse in Berührung kommt, und dadurch ein Kurzschluss auf die Betätigungsachse erzeugt wird. Dies empfiehlt sich besonders dann, wenn die Betätigungsachse in unmittelbarer Nähe zu einer der Kontaktstellen angeordnet ist. Bei einem dreipoligen Leistungsschütz, das als Motorschütz in Bahntriebwagen zum Einsatz kommt, verhält es sich in der Regel so, dass eine der Kontaktbrücken (beweglicher Kontakt) unmittelbar an einem Ende der Betätigungsachse angebracht ist. Die mittlere Kontaktbrücke liegt quasi in derselben Ebene, in der auch die Betätigungsachse liegt. Bei dieser Konstellation besteht eine erhebliche Gefahr, dass das vom Lichtbogen erzeugte Plasma mit der Betätigungsachse in Berührung kommt. Dies wird jedoch durch die fest-stehende Isolierhülse verhindert. Die feststehende Isolierhülse bildet somit ein feststehendes Bauteil des Leistungsschützes und ist vorzugsweise an einer auf der Jochplatte des Schützes aufliegenden Isolierplatte angebracht. Um eine optimale Dichtwirkung zu er-zielen, schließt die feststehende Isolierhülse vorzugsweise bündig mit der Jochplatte ab. Sofern die Betätigungsachse zylindrisch ausgeführt ist, bietet es sich an, die feststehende Isolierhülse hohlzylindrisch auszubilden. Prinzipiell kann jedoch ein beliebiger anderer Querschnitt gewählt werden, der eine ausreichende Dichtwirkung gewährleistet.According to the present invention, the armature is connected to an actuating axis of metal, wherein the actuating axis is at least partially surrounded by a fixed insulating sleeve, wherein the actuating axis is at least partially surrounded by a relative to the fixed insulating sleeve moving insulating sleeve, wherein the moving insulating sleeve fixed to the actuating axis is connected, and wherein stationary insulating sleeve and moving insulating sleeve cooperate telescopically. The fixed insulating sleeve and the moving insulating sleeve act together in the manner of a labyrinth seal. This prevents the plasma generated by the arc from coming into contact with the actuation axis, thereby creating a short circuit on the actuation axis. This is particularly recommended if the actuation axis is arranged in the immediate vicinity of one of the contact points. In the case of a three-pole power contactor, which is used as a motor contactor in railcar railcars, it is generally the case that one of the contact bridges (movable contact) is attached directly to one end of the actuation axis. The middle contact bridge is virtually in the same plane in which the actuating axis is located. In this constellation, there is a significant risk that the plasma generated by the arc comes into contact with the actuating axis. However, this is due to the fixed insulating sleeve prevented. The fixed insulating sleeve thus forms a fixed component of the power contactor and is preferably attached to a resting on the yoke plate of the contactor insulating. In order to achieve an optimum sealing effect, the fixed insulating sleeve preferably terminates flush with the yoke plate. If the actuating axis is cylindrical, it makes sense to form the fixed insulating sleeve in a hollow cylinder. In principle, however, any other cross section can be selected which ensures a sufficient sealing effect.

Durch die Erfindung wird verhindert, dass Plasma, welches beim Öffnen der Kontakte aufgrund eines Schaltlichtbogens erzeugt wird, von einer Kontaktstelle bzw. einer die Kontaktstelle umschließenden Kammer zu einer benachbarten Kontaktstelle bzw. der zugehörigen Kammer strömt. Dadurch wird auch verhindert, dass der Schaltlichtbogen auf die benachbarte Kontaktstelle überschlägt. Vorzugsweise ist eine der beiden Barrieren an einer auf der Jochplatte des Leistungsschützes aufliegenden Isolierplatte angebracht oder indirekt mit der Jochplate verbunden. Um eine optimale Dichtwirkung zu erzielen, schließt diese Barriere vorzugsweise bündig mit der Jochplatte ab. Diejenige Barriere, die mit dem Anker verbunden ist, kann entweder direkt oder indirekt mit dem Anker verbunden sein. Sie ist vorzugsweise über einen Kontaktträger mit dem Anker verbunden.The invention prevents plasma, which is generated when opening the contacts due to a switching arc, from a contact point or a chamber enclosing the contact point to an adjacent contact point or the associated chamber. This also prevents the switching arc from striking the adjacent contact point. Preferably, one of the two barriers is attached to a resting on the yoke plate of the contactor insulating or indirectly connected to the Jochplate. In order to achieve an optimum sealing effect, this barrier preferably ends flush with the yoke plate. The barrier connected to the anchor may be connected either directly or indirectly to the anchor. It is preferably connected via a contact carrier with the armature.

Weiter vorzugsweise beträgt der Abstand zwischen erster und zweiter Barriere im Überdeckungsbereich weniger als 5 mm, weiter vorzugsweise weniger als 2 mm, und besonders bevorzugt weniger als 1 mm.Further preferably, the distance between the first and second barrier in the covering area is less than 5 mm, more preferably less than 2 mm, and particularly preferably less than 1 mm.

Vorteilhafte Ausgestaltungen der vorliegenden Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the present invention are the subject of the dependent claims.

In einer besonders bevorzugten Ausführungsform der vorliegenden Erfindung wirken erste Barriere und zweite Barriere nach Art einer Labyrinthdichtung zusammen. Auf diese Weise wird das Plasma besonders effektiv daran gehindert, von einer Kontaktstelle zu einer benachbarten Kontaktstelle zu gelangen.In a particularly preferred embodiment of the present invention, the first barrier and the second barrier interact in the manner of a labyrinth seal. In this way, the plasma is particularly effectively prevented from getting from one contact point to an adjacent contact point.

Die Barrieren sind besonders einfach und kostengünstig umzusetzen, wenn sie jeweils durch zumindest eine Platte gebildet sind. Dabei ist es hinsichtlich der Dichtwirkung von besonderem Vorteil, wenn die erste Barriere zumindest zwei parallele Platten aufweist, wobei zumindest eine Platte der zweiten Barriere zwischen den zwei parallelen Platten der ersten Barriere angeordnet ist. Dadurch wird eine besonders effektive Labyrinthdichtung bewirkt. Besonders einfach umzusetzen ist diese Ausführungsform, wenn die zwei parallelen Platten an einem mit dem Anker verbundenen Kontaktträger befestigt oder Teil des Kontaktträgers sind.The barriers are particularly simple and inexpensive to implement, if they are each formed by at least one plate. In this case, it is of particular advantage with regard to the sealing effect if the first barrier has at least two parallel plates, wherein at least one plate of the second barrier is arranged between the two parallel plates of the first barrier. This will be a particularly effective labyrinth seal causes. This embodiment is particularly easy to implement when the two parallel plates are fastened to a contact carrier connected to the armature or are part of the contact carrier.

In einer weiteren besonders bevorzugten Ausführungsform der vorliegenden Erfindung bestehen die Barrieren aus Kunststoff oder Keramik. Diese beiden Materialien sind elektrisch nicht leitfähig, wodurch sichergestellt wird, dass keine elektrische Leitfähigkeit zwischen zwei benachbarten Kontaktstellen hergestellt wird.In a further particularly preferred embodiment of the present invention, the barriers are made of plastic or ceramic. These two materials are electrically non-conductive, which ensures that no electrical conductivity is produced between two adjacent contact points.

In einer weiteren besonders bevorzugten Ausführungsform der vorliegenden Erfindung weist das Leistungsschütz eine Jochplatte auf, wobei zumindest ein Bauteil des Leistungsschützes, das in unmittelbarer Nähe zu einer der Kontaktstellen an der Jochplatte angebracht ist, mittels einer oder mehrerer Kunststoffschrauben an der Jochplatte befestigt ist. Vorzugsweise sind die Kunststoffschrauben als hochfeste Kunststoffschrauben ausgeführt. Bei dieser Ausführungsform wird gegenüber herkömmlichen Leistungsschützen, bei welchen elektrisch leitfähige Metallschrauben zum Einsatz kommen, verhindert, dass durch Plasma und Schraube ein Kurzschluss auf die geerdete Jochplatte erzeugt werden kann. Diese Ausführungsform eignet sich auch für Schrauben, die nicht in die Jochplatte des Leistungsschützes, sondern in ein beliebiges geerdetes Bauteil des Leistungsschützes eingeschraubt sind. Bei den zu befestigenden Bauteilen handelt es sich beispielsweise um Gehäuseteile oder um Lichtbogenlöschkammern. Es wird darauf hingewiesen, dass sich die Verwendung von Kunststoffschrauben nicht nur bei dem erfindungsgemäßen Leistungsschütz sondern generell bei Leistungsschützen eignet. Die Verwendung von Kunststoffschrauben zu den oben genannten Zwecken stellt daher eine eigene Erfindung dar, wenngleich sie bei dem erfindungsgemäßen Leistungsschütz zu einer weiteren Verbesserung der Schalttauglichkeit führt.In a further particularly preferred embodiment of the present invention, the power contactor comprises a yoke plate, wherein at least one component of the power contactor, which is mounted in close proximity to one of the contact points on the yoke plate, is secured by means of one or more plastic screws on the yoke plate. Preferably, the plastic screws are designed as high-strength plastic screws. In this embodiment, compared to conventional power contactors, in which electrically conductive metal screws are used, prevented by plasma and screw, a short circuit to the grounded yoke plate can be generated. This embodiment is also suitable for screws that are not screwed into the yoke plate of the power contactor, but in any grounded component of the contactor. The components to be fastened are, for example, housing parts or arc extinguishing chambers. It should be noted that the use of plastic screws is not only in the power contactor according to the invention but generally suitable for contactors. The use of plastic screws for the above purposes is therefore a separate invention, although it leads to a further improvement in the switching capability in the power contactor according to the invention.

In einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung ist die Jochplatte des Leistungsschützes auf derjenigen Seite, die den Kontaktstellen zugewandt ist, zumindest teilweise mit einer Isolierfolie versehen. Dadurch wird die Beaufschlagung durch Plasma verhindert und die Kurzschlussgefahr weiter reduziert.In a further preferred embodiment of the present invention, the yoke plate of the power contactor on the side facing the contact points, at least partially provided with an insulating film. This prevents exposure to plasma and further reduces the risk of short circuits.

Vorzugsweise sind sowohl die feststehende Isolierhülse als auch die bewegte Isolierhülse aus Kunststoff oder Keramik gefertigt. Weiter vorzugsweise besteht zwischen den beiden Hülsen ein sehr geringer Abstand, um die Dichtwirkung zu optimieren. Bevorzugt ist ein Abstand kleiner 1 mm.Preferably, both the fixed insulating sleeve and the moving are Insulating sleeve made of plastic or ceramic. Further preferably, there is a very small distance between the two sleeves in order to optimize the sealing effect. A distance of less than 1 mm is preferred.

In einer weiteren besonders bevorzugten Ausführungsform der vorliegenden Erfindung sind die beweglichen Kontakte und/oder die Festkontakte jeweils mit einem Lichtbogenleithorn ausgeführt, wobei die Lichtbogenleithörner zumindest abschnittweise verjüngt sind. Es wird darauf hingewiesen, dass sich Kontakte mit verjüngtem Lichtbogenleithorn nicht nur für das erfindungsgemäße Leistungsschütz sondern generell für den Einsatz in Leistungsschützen eignen. Eine Ausführungsform mit verjüngtem Lichtbogenleithorn sowie die nachfolgend beschriebenen vorteilhaften Ausgestaltungen stellen daher eine eigene Erfindung dar, die jedoch gleichermaßen zur weiteren Optimierung der Schalttauglichkeit des erfindungsgemäßen Schaltschützes beiträgt. Bei einem Lichtbogenleithorn handelt es sich um eine winklig vom jeweiligen Kontakt abstehende Verlängerung des Kontaktes, über die der Schaltlichtbogen nach seiner Entstehung in die entsprechende Lichtbogenlöscheinrichtung geleitet wird. Hierzu bedient man sich magnetischer Felder, die durch Permanentmagneten oder Elektromagneten oder die elektromagnetische Blaswirkung speziell ausgebildeter Kontaktstücke erzeugt werden. Durch die Verjüngung der Lichtbogenleithörner resultiert eine Einengung der magnetischen Feldlinien, was wiederum eine Verstärkung der elektromagnetischen Blaswirkung bewirkt. Dadurch kann das Schalten von Lichtbögen im niedrigen Strombereich merklich verbessert werden. Vorzugsweise werden die Lichtbogenleithörner so schmal gehalten, wie es die Lebensdaueranforderungen erlauben. Vorzugsweise sind die Lichtbogenleithörner jedenfalls gegenüber der eigentlichen Kontaktfläche des jeweiligen Kontaktes um mindestens 25 %, vorzugsweise um mindestens 50 % verjüngt.In a further particularly preferred embodiment of the present invention, the movable contacts and / or the fixed contacts are each carried out with an arcing stirrer, wherein the arcs are at least partially tapered. It should be noted that contacts with tapered arc guide are not only suitable for the power contactor according to the invention but generally for use in power contactors. An embodiment with tapered Lichtbogenleithorn and the advantageous embodiments described below therefore represent a separate invention, however, equally contributes to the further optimization of the switching capability of the contactor according to the invention. An arc guide is an extension of the contact which protrudes at an angle from the respective contact and via which the switching arc is conducted after its formation into the corresponding arc quenching device. For this purpose, one uses magnetic fields, which are generated by permanent magnets or electromagnets or the electromagnetic blowing action of specially trained contacts. The tapering of the arcing grains results in a narrowing of the magnetic field lines, which in turn causes an amplification of the electromagnetic blowing effect. As a result, the switching of arcs in the low current range can be significantly improved. Preferably, the arc guide grains are kept as narrow as the lifetime requirements permit. In any case, the arc guide grains are preferably at least 25%, preferably at least 50%, narrower than the actual contact surface of the respective contact.

Ganz besonders bevorzugt ist das Lichtbogenleithorn als separates Bauteils ausgeführt und an dem betreffenden Festkontakt bzw. beweglichen Kontakt befestigt. Vorzugsweise erfolgt die Befestigung durch Vernieten. Weiter vorzugsweise bestehen die Lichtbogenleithörner aus Bronze. Bei dieser Ausführungsform ergibt sich eine deutlich höhere Lebensdauer der Lichtbogenleithörner im Vergleich zu Lichtbogenleithörnern herkömmlicher Bauart, die zusammen mit dem betreffenden Kontakt ein Kupfervollteil bilden. Es hat sich gezeigt, dass herkömmliche Lichtbogenleithörner durch Schwingungsbelastung frühzeitig abbrechen können.Most preferably, the arc guide is designed as a separate component and attached to the respective fixed contact or movable contact. Preferably, the attachment is done by riveting. More preferably, the arc guide grains are made of bronze. In this embodiment, there is a significantly higher lifetime of the arcing grains as compared to arcs of conventional design, which form together with the relevant contact a copper full part. It has been shown that conventional arc guide grains can break off early due to vibration load.

In einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung weist die Jochplatte des Leistungsschützes einen Durchbruch im Bereich einer der Kontaktstellen auf, wobei der Durchbruch mit einer Moosgummimatte abgedichtet ist. Diese Ausführungsform bietet sich beispielsweise dann an, wenn die Jochplatte einen Durchbruch für ein fest mit dem Anker bzw. Kontaktträger verbundenes Verbindungssteil aufweist, über welches ein unterhalb der Jochplatte angeordneter Hilfsschalter betätigt wird. Die Moosgummimatte ist vorzugsweise so ausgebildet, dass sie das Verbindungsteil dichtend umschließt. Diese Ausführungsform hat den Vorteil, dass das durch den Lichtbogen erzeugte Plasma nicht über den Durchbruch mit der Jochplatte bzw. mit darunter angeordneten geerdeten Bauteilen des Leistungsschützes in Kontakt kommt, und dadurch die Gefahr eines Kurzschlusses erzeugt. Es wird darauf hingewiesen, dass die Abdichtung eines Durchbruchs mittels einer Moosgummimatte nicht nur bei dem erfindungsgemäßen Leistungsschütz sondern generell bei Leistungsschützen vorgenommen werden kann. Diese Ausführung stellt demnach eine eigene Erfindung dar, die jedoch zur weiteren Optimierung der Schalttauglichkeit des erfindungsgemäßen Schaltschützes beiträgt.In a further preferred embodiment of the present invention, the yoke plate of the power contactor on a breakthrough in the region of one of the contact points, wherein the breakthrough is sealed with a sponge rubber mat. This embodiment lends itself, for example, when the yoke plate has an opening for a permanently connected to the armature or contact carrier connecting part, via which an arranged below the yoke plate auxiliary switch is actuated. The sponge rubber mat is preferably designed such that it encloses the connecting part in a sealing manner. This embodiment has the advantage that the plasma generated by the arc does not come into contact with the yoke plate or earthed components of the power contactor arranged thereunder via the opening, and thereby creates the risk of a short circuit. It should be noted that the sealing of a breakthrough by means of a sponge rubber mat can be made not only in the power contactor according to the invention but generally in power contactors. This embodiment therefore constitutes a separate invention, which, however, contributes to the further optimization of the switching capability of the contactor according to the invention.

Ein Ausführungsbeispiel der vorliegenden Erfindung wird im Folgenden anhand von Zeichnungen näher erläutert. Es zeigen:

Figur 1:
eine teilweise geschnittene Schrägansicht eines erfindungsgemäßen Leistungsschützes,
Figur 2:
einen schematischen Längsschnitt durch das erfindungsgemäße Leistungsschütz aus Figur 1, und
Figur 3:
eine Detailansicht einer der Kontaktbrücken des erfindungsgemäßen Leistungsschützes aus den Figuren 1 und 2.
An embodiment of the present invention will be explained in more detail below with reference to drawings. Show it:
FIG. 1:
a partially sectioned oblique view of a power contactor according to the invention,
FIG. 2:
a schematic longitudinal section through the contactor according to the invention FIG. 1 , and
FIG. 3:
a detailed view of the contact bridges of the power contactor according to the invention from the FIGS. 1 and 2 ,

Für die folgenden Ausführungen gilt, dass gleiche Teile durch gleiche Bezugszeichen bezeichnet werden. Sofern in einer Zeichnung Bezugszeichen enthalten sind, auf die in der zugehörigen Figurenbeschreibung nicht näher eingegangen wird, so wird auf vorangehende oder nachfolgende Figurenbeschreibungen Bezug genommen.For the following statements applies that the same parts are designated by the same reference numerals. If reference signs are contained in a drawing, which are not discussed in detail in the associated description of the figures, reference is made to preceding or subsequent description of the figures.

Figur 1 zeigt eine teilweise geschnittene Schrägansicht eines erfindungsgemäßen Leistungsschützes 1. Das Leistungsschütz ist dreipolig ausgeführt und umfasst drei nebeneinander angeordnete Schaltstellen. Der Anker 2 des elektromagnetischen Antriebs ist über eine Betätigungsachse 14 mit einem Kontaktträger 3 verbunden. Der Kontaktträger 3 des Leistungsschützes weist drei in Figur 2 näher dargestellte Kontaktbrückenhalterungen 23 auf, wobei jede der drei Kontaktbrückenhalterungen eine der drei nebeneinander angeordneten Kontaktbrücken 4 trägt. Die drei Kontaktbrücken bilden die beweglichen Kontakte des Leistungsschützes. Eine der drei Kontaktbrückenhalterungen ist am oberen Ende der Betätigungsachse 14 angeordnet, welche von dem elektromagnetischen Antrieb 2 betätigt wird. Der Kontaktträger 3 ist mittels des Ankers 2 von einer geöffneten Stellung, in der die beweglichen Kontakte 4 und die jeweils zugehörigen Festkontakte 5 einander nicht berühren, in eine geschlossene Stellung überführbar, in der die beweglichen Kontakte 4 mit den Festkontakten 5 in Berührung kommen und dadurch eine elektrische Verbindung herstellen. Beim Öffnen der Kontakte entsteht ein Schaltlichtbogen, der insbesondere bei hohen zu schaltenden Lasten möglichst schnell zum Erlöschen gebracht werden muss, um eine Beschädigung der Kontakte oder weiterer Bauteile des Leistungsschützes zu verhindern. Jeder Kontaktstelle, bestehend aus beweglichem Kontakt 4 und entsprechendem Festkontakt 5, ist daher eine Lichtbogenlöscheinrichtung zugeordnet. Die Löschkammern 6 der Lichtbogenlöscheinrichtungen sind für 4 der insgesamt 6 Kontaktstellen in Figur 1 gezeigt. FIG. 1 shows a partially sectioned oblique view of a power contactor according to the invention 1. The power contactor is designed in three poles and comprises three juxtaposed switching points. The armature 2 of the electromagnetic drive is over an actuating shaft 14 connected to a contact carrier 3. The contact carrier 3 of the power contactor has three in FIG. 2 contact bridges shown in more detail 23, wherein each of the three contact bridge supports one of the three juxtaposed contact bridges 4 carries. The three contact bridges form the moving contacts of the contactor. One of the three contact bridge holders is arranged at the upper end of the actuating axis 14, which is actuated by the electromagnetic drive 2. The contact carrier 3 is by means of the armature 2 of an open position in which the movable contacts 4 and the respective associated fixed contacts 5 do not touch each other, can be transferred to a closed position in which the movable contacts 4 come into contact with the fixed contacts 5 and thereby to make an electrical connection. When opening the contacts creates a switching arc, which must be brought to extinction as quickly as possible, especially at high loads to be switched to prevent damage to the contacts or other components of the power contactor. Each contact point, consisting of movable contact 4 and corresponding fixed contact 5, is therefore associated with an arc quenching device. The extinguishing chambers 6 of the arc quenching devices are for 4 of the total of 6 contact points in FIG. 1 shown.

Im Störungsfall müssen unter Umständen hunderte von Kilowatt elektrischer Leistung mittels des Leistungsschützes 1 zuverlässig abgeschaltet werden können. Der bei der Abschaltung entstehende Lichtbogen erzeugt ein Plasma, das für kurze Zeit nicht nur im unmittelbaren Bereich der Kontaktstellen verbleibt, sondern im schlechtesten Fall sogar zur benachbarten Schaltstelle wandert. In diesem Fall besteht die Gefahr, dass der Lichtbogen auf die benachbarte Schalt- bzw. Kontaktstelle überschlägt. Um dies zu verhindern, ist erfindungsgemäß eine Plasmasperre zwischen zwei benachbarten Kontaktstellen vorgesehen. Die Plasmasperre besteht im Wesentlichen aus Trennwänden, die nach Art einer Labyrinthdichtung zusammenwirken und die entsprechenden Kontaktstellen voneinander trennen. In Figur 2 ist zu erkennen, dass jede Plasmasperre über zwei parallel zueinander angeordnete Platten 7.1 und 7.2 verfügt, die fest mit dem Kontaktträger 3 verbunden sind. Kontaktträger 3 und Platten bilden bevorzugter Weise ein einziges Bauteil. Die beiden parallel zueinander ausgerichteten Platten 7.1 und 7.2 schließen zwischen sich eine weitere Platte 8 ein, die mit einem feststehenden Bauteil des Leistungsschützes verbunden ist. Beim dargestellten Ausführungsbeispiel ist auf die Jochplatte 9 des Leistungsschützes eine entsprechende Kunststoffplatte 22 aufgebracht, von der die mittlere Platte 8 im Wesentlichen senkrecht absteht. Die Platten 7.1 und 7.2 überdecken die mittlere Platte 8 zumindest teilweise, und zwar in jeder Stellung des Ankers zwischen der geöffneten und der geschlossenen Stellung. Die Platten 7.1 und 7.2 wirken somit mit der Platte 8 nach Art einer Labyrinthdichtung zusammen und verhindern somit wirksam, dass Plasma, welches an einer der Kontaktstellen durch einen Schaltlichtbogen erzeugt wird, zur benachbarten Schaltstelle wandert.In the event of a malfunction, hundreds of kilowatts of electrical power may have to be reliably switched off by means of the contactor 1. The arc produced during the shutdown generates a plasma which, for a short time, not only remains in the immediate area of the contact points, but in the worst case even migrates to the adjacent switching point. In this case, there is the danger that the arc will overturn on the adjacent switching or contact point. In order to prevent this, according to the invention a plasma barrier is provided between two adjacent contact points. The plasma barrier consists essentially of partitions, which interact in the manner of a labyrinth seal and separate the corresponding contact points from each other. In FIG. 2 It can be seen that each plasma barrier has two mutually parallel plates 7.1 and 7.2, which are firmly connected to the contact carrier 3. Contact carrier 3 and plates preferably form a single component. The two parallel aligned plates 7.1 and 7.2 include between them another plate 8, which is connected to a fixed component of the power contactor. In the illustrated embodiment, a corresponding plastic plate 22 is applied to the yoke plate 9 of the power contactor, of which the middle Plate 8 protrudes substantially perpendicular. The plates 7.1 and 7.2 cover the middle plate 8 at least partially, in each position of the armature between the open and the closed position. The plates 7.1 and 7.2 thus cooperate with the plate 8 in the manner of a labyrinth seal and thus effectively prevent plasma, which is generated at one of the contact points by a switching arc, moves to the adjacent switching point.

Um zu verhindern, dass das Plasma mit der Jochplatte 9 oder einem darunter angeordneten geerdeten Bauteil des Leistungsschützes in Berührung kommt und dadurch einen Kurzschluss erzeugt, wurden bei dem erfindungsgemäßen Leistungsschütz gemäß dem gezeigten Ausführungsbeispiel zusätzliche Maßnahmen ergriffen. Zum einen ist zwischen der Jochplatte 9 und der darauf liegenden Kunststoffplatte 22 eine Isolierfolie 11 vorgesehen. Außerdem hat sich gezeigt, dass es auch zu einem Kurzschluss kommen kann, falls das Plasma mit einer Metallschraube, in Berührung kommt, die zur Befestigung eines beliebigen Bauteils an der Jochplatte 9 dient. So sind beispielsweise die Lichtbogenlöschkammern 6 mittels entsprechender Schrauben an der Jochplatte 9 befestigt. Um die Schalttauglichkeit zu erhöhen, sind bei dem erfindungsgemäßen Leistungsschütz hochfeste Kunststoffschrauben 10 vorgesehen, um Bauteile in unmittelbarer Nähe zu den jeweiligen Kontaktstellen an der Jochplatte zu befestigen.In order to prevent the plasma from coming into contact with the yoke plate 9 or a grounded component of the power contactor arranged underneath, thereby generating a short circuit, additional measures have been taken in the power contactor according to the invention in the exemplary embodiment shown. On the one hand, an insulating film 11 is provided between the yoke plate 9 and the plastic plate 22 thereon. In addition, it has been found that it can also lead to a short circuit, if the plasma with a metal screw, comes into contact, which serves to attach any component to the yoke plate 9. For example, the arc extinguishing chambers 6 are fastened to the yoke plate 9 by means of appropriate screws. In order to increase the switching capability, in the power contactor according to the invention high-strength plastic screws 10 are provided to fasten components in close proximity to the respective contact points on the yoke plate.

Des Weiteren ist auch gegenüber der aus Metall bestehenden Betätigungsachse 14 eine Plasmasperre vorgesehen. Sie besteht aus einer feststehenden Isolierhülse 12, die von der Kunststoffplatte 22 absteht, und einer bewegten Isolierhülse 13, die Teil des Kontaktträgers 3 ist. Die feststehende Isolierhülse 12 und die bewegte Isolierhülse 13 wirken teleskopartig und nach Art einer Labyrinthdichtung zusammen. Zwischen den beiden Hülsen besteht ein sehr geringer Abstand, genauso wie zwischen den Platten 8 und 7.1 bzw. 7.2.Furthermore, a plasma barrier is also provided in relation to the actuating axis 14 consisting of metal. It consists of a fixed insulating sleeve 12 which protrudes from the plastic plate 22, and a moving insulating sleeve 13, which is part of the contact carrier 3. The fixed insulating sleeve 12 and the moving insulating sleeve 13 act telescopically and in the manner of a labyrinth seal together. There is a very short distance between the two sleeves, as well as between the plates 8 and 7.1 or 7.2.

Des Weiteren ist bei dem Leistungsschütz ein Hilfsschalter vorgesehen, der über den Anker betätig wird. Bei dem dargestellten erfindungsgemäßen Leistungsschütz ist hierzu ein Verbindungsteil 20 mit dem Kontaktträger 3 verbunden. Das Verbindungsteil 20 betätigt einen unterhalb der Jochplatte 9 angeordneten Hilfskontakt, und ist daher durch einen Durchbruch 19 in der Jochplatte 9 hindurchgeführt. Um zu verhindern, dass Plasma, welches beim Schaltvorgang entsteht, mit der Jochplatte 9 oder darunter angeordneten geerdeten Bauteilen des Leistungsschützes in Berührung kommt, ist der Durchbruch 19 mittels einer Moosgummimatte 21 abgedichtet. Selbstverständlich weist die Moosgummimatte einen im Vergleich zum Durchbruch 19 der Jochplatte 9 wesentlich kleineren Durchbruch auf, durch den das Verbindungsteil 20 hindurchgeführt ist.Furthermore, an auxiliary switch is provided in the power contactor, which is actuated via the armature. In the illustrated power contactor according to the invention, a connecting part 20 is connected to the contact carrier 3 for this purpose. The connecting part 20 actuates a arranged below the yoke plate 9 auxiliary contact, and is therefore passed through an opening 19 in the yoke plate 9. In order to prevent plasma, which is formed during the switching process, coming into contact with the yoke plate 9 or below grounded components of the power contactor, the opening 19 is sealed by means of a sponge rubber mat 21. Of course, the foam rubber mat has a significantly smaller breakthrough compared to the opening 19 of the yoke plate 9, through which the connecting part 20 is passed.

Eine weitere Maßnahme, die bei dem erfindungsgemäßen Leistungsschütz ergriffen wurde, um die Schalttauglichkeit zu erhöhen, ist in Figur 3 gezeigt. Fig. 3 zeigt eine der drei Kontaktbrücken 4 im Detail. Zu erkennen sind die beiden Kontaktflächen 18, die bei geschlossenem Leistungsschütz mit den entsprechenden Festkontakten 5 in Berührung kommen. An den beiden Enden der Kontaktbrücke 4 ist jeweils ein im Wesentlichen senkrecht abstehendes Lichtbogenleithorn 15 angeordnet. Die Lichtbogenleithörner 15 sind aus Bronze gefertigt und mit der Kontaktbrücke 4 vernietet. Die Nietverbindungen 17 sind im mittleren Bereich der Kontaktbrücke angeordnet. Der senkrecht abstehende Bereich 16 der Lichtbogenhörner 15 ist stark verjüngt, um eine Einengung der magnetischen Feldlinien und damit eine Verstärkung der elektromagnetischen Blaswirkung zu erzielen.Another measure that has been taken in the power contactor according to the invention in order to increase the switching capability, is in FIG. 3 shown. Fig. 3 shows one of the three contact bridges 4 in detail. Evident are the two contact surfaces 18, which come into contact with the corresponding fixed contacts 5 when the contactor is closed. At the two ends of the contact bridge 4, a substantially perpendicular projecting arc guide 15 is arranged in each case. The Lichtbogenleithörner 15 are made of bronze and riveted to the contact bridge 4. The rivet connections 17 are arranged in the middle region of the contact bridge. The vertically projecting region 16 of the arc horns 15 is strongly tapered in order to achieve a narrowing of the magnetic field lines and thus an amplification of the electromagnetic blowing effect.

Claims (10)

  1. Multipolar power contactor (1) with an electromagnetic drive, a movable armature (2) and with at least two movable contacts (4) that are arranged next to one another and connected to the armature (2), whereby corresponding fixed contacts (5) of the power contactor (1) are assigned to the movable contacts (4), whereby the armature (2) can be moved from an open position, in which the movable contacts (4) and the fixed contacts (5) do not come into contact with one another, to a closed position, in which the movable contacts (4) come into contact with the fixed contacts (5), and whereby each contact point, which consists of a movable contact (4) and a corresponding fixed contact (5), is assigned an arc quenching device (6), whereby a plasma barrier is disposed between two movable contacts (4) that are arranged next to one another, whereby the plasma barrier has a first barrier (7) as well as a second barrier (8), whereby one of the two barriers (7) is connected to the armature (2) and the other one of the two barriers (8) to a stationary part (22) of the power contactor (1), whereby the first barrier (7) and the second barrier (8) overlap at least partially with one another in each position of the armature (2) between the open and the closed position, and wherein the armature (2) is connected to an actuation axis (14), characterized in that the actuation axis (14) is made of metal and is enclosed at least partially by a stationary insulation sleeve (12), wherein the actuation axis (14) is enclosed at least partially by a moved insulation sleeve (13) that is movable relative to the stationary insulation sleeve (12), whereby the moved insulation sleeve (13) is connected firmly to the actuation axis (14), and whereby the stationary insulation sleeve (12) and the moved insulation sleeve (13) interact telescopically.
  2. Power contactor (1) according to Claim 1, characterized in that the first barrier (7) and the second barrier (8) interact in the way of a labyrinth seal.
  3. Power contactor (1) according to Claim 1 or 2, characterized in that the first barrier (7) and the second barrier (8) are each formed by at least one plate.
  4. Power contactor (1) according to Claim 3, characterized in that the first barrier (7) has at least two parallel plates (7.1, 7.2), whereby at least one plate of the second barrier (8) is arranged between the two parallel plates (7.1, 7.2) of the first barrier.
  5. Power contactor (1) according to one of the Claims 1 to 4, characterized in that the barriers (7, 8) are made of plastic or ceramic.
  6. Power contactor (1) according to one of the Claims 1 to 5, characterized in that the power contactor (1) has a yoke plate (9), whereby at least one component of the power contactor (1), which is installed in immediate proximity to one of the contact points on the yoke plate (9), is fixed on the yoke plate by means of one or multiple plastic screws (10).
  7. Power contactor (1) according to one of the Claims 1 to 6, characterized in that the yoke plate (9) of the power contactor (1) is equipped at least partially with an insulation film (11) on the side that faces the contact points.
  8. Power contactor (1) according to one of the Claims 1 to 7, characterized in that the movable contacts (4) and/or the fixed contacts (5) are respectively designed with an arc guide horn (15), whereby the arc guide horns (15) are tapered at least in a sectional way.
  9. Power contactor (1) according to Claim 8, characterized in that the arc guide horn (15) is designed as a separate component and fastened on the corresponding fixed contact (5) and/or movable contact (4).
  10. Power contactor (1) according to one of the Claims 1 to 9, characterized in that the yoke plate (9) of the power contactor (1) has a breakthrough (19) in the area of one of the contact points, whereby the breakthrough (19) is sealed with a foam rubber mat (21).
EP15701099.2A 2014-03-31 2015-01-22 Multipolar power contactor Active EP3127131B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014004665.6A DE102014004665B4 (en) 2014-03-31 2014-03-31 Multi-pole contactor
PCT/EP2015/000124 WO2015149895A1 (en) 2014-03-31 2015-01-22 Multipolar power contactor

Publications (2)

Publication Number Publication Date
EP3127131A1 EP3127131A1 (en) 2017-02-08
EP3127131B1 true EP3127131B1 (en) 2018-10-31

Family

ID=52396648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15701099.2A Active EP3127131B1 (en) 2014-03-31 2015-01-22 Multipolar power contactor

Country Status (10)

Country Link
US (1) US9799471B2 (en)
EP (1) EP3127131B1 (en)
JP (1) JP6512491B2 (en)
KR (1) KR101821920B1 (en)
CN (1) CN106537539B (en)
DE (1) DE102014004665B4 (en)
ES (1) ES2703554T3 (en)
RU (1) RU2646620C1 (en)
UA (1) UA118695C2 (en)
WO (1) WO2015149895A1 (en)

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DE102018216211B3 (en) 2018-09-24 2020-02-20 Siemens Aktiengesellschaft Short-circuiting device and converter

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Also Published As

Publication number Publication date
UA118695C2 (en) 2019-02-25
KR101821920B1 (en) 2018-01-25
US9799471B2 (en) 2017-10-24
WO2015149895A4 (en) 2016-09-01
EP3127131A1 (en) 2017-02-08
ES2703554T3 (en) 2019-03-11
WO2015149895A9 (en) 2016-07-14
JP6512491B2 (en) 2019-05-15
JP2017510040A (en) 2017-04-06
KR20160137637A (en) 2016-11-30
US20170062156A1 (en) 2017-03-02
CN106537539A (en) 2017-03-22
WO2015149895A1 (en) 2015-10-08
RU2646620C1 (en) 2018-03-06
DE102014004665B4 (en) 2019-12-05
DE102014004665A1 (en) 2015-10-01
CN106537539B (en) 2018-11-20

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