EP0782758B1 - Multi-pole contactor - Google Patents

Multi-pole contactor Download PDF

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Publication number
EP0782758B1
EP0782758B1 EP95930387A EP95930387A EP0782758B1 EP 0782758 B1 EP0782758 B1 EP 0782758B1 EP 95930387 A EP95930387 A EP 95930387A EP 95930387 A EP95930387 A EP 95930387A EP 0782758 B1 EP0782758 B1 EP 0782758B1
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EP
European Patent Office
Prior art keywords
phase
contactor according
armature
changeover device
multipole
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Expired - Lifetime
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EP95930387A
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German (de)
French (fr)
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EP0782758A1 (en
Inventor
Felix Pohl
Fritz Pohl
Norbert Elsner
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Siemens AG
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Siemens AG
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    • 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
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H9/563—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle for multipolar switches, e.g. different timing for different phases, selecting phase with first zero-crossing

Definitions

  • the invention relates to a multi-pole contactor AC drive, with a magnetic coil, a magnetic yoke with eddy current rings and a movable magnet armature, at which a phase changeover device for switching on Tax phase is available according to predetermined criteria (DE-A-10 40 105).
  • AC operated Magnetic drives from shooters consist of the magnetic coil, the fixed magnetic yoke with eddy current rings and the movable one Magnetic anchor, which is a bridge girder for the recording the switch bridges.
  • the maintenance interval for the exchange is determined the main contact pieces of a protection after contact erosion in the most stressed phase.
  • From DE-A-10 40 105 is a phase switching device for three-phase switching devices that switch off almost synchronously in the zero current crossing, e.g. Sagittarius, known, with the hand-operated or automatically that phase conductor of the three-phase network is selected as the control phase of the magnetic drive in which the so-called switching fire of the main contactors is the lowest is.
  • the object of the invention is in a multipole Protection to even out the erosion on the contact pieces.
  • the task is according to the invention with a multi-pole protection of the type mentioned in that solved with the phase switching device the control phase for the magnetic drive alternately connected to one of the phases of the main circuit and that the phase changeover at Switching off the magnetic drive is actuated.
  • the phase switching device can alternatively be electromechanical or work electronically.
  • FIG. 1 shows the AC1 test and FIG. 2 shows the AC3 test a well-known three-pole protection with AC drive.
  • the loss of material is shown in each case on the three main phases L1, L2 and L3.
  • the abscissa marks the number of operations and the ordinate the respective loss of material of the contacts to the individual Phases.
  • FIGS 3 to 5 show an electromechanical phase changeover device: there is a cam drive, which during the opening movement the armature by a defined angle of rotation becomes. By changing the phase during the Opening movement of the magnet armature when the magnet coil is switched off takes place, it is ensured that the changeover of the Tax phase is largely without current.
  • a safety circuit 30 is shown in detail in FIG. 3, in which a contactor coil 31 is connected in parallel with a relay coil 32.
  • a normally closed auxiliary contact ⁇ 1 is controlled by the contactor coil 31, and a normally open relay contact S1 by the relay coil 32.
  • the NC auxiliary contact ⁇ 1 is followed by a button S2 and another button ⁇ 2 for switching the contactor on and off.
  • a switching device 40 which contains three switching cams 41, 42 and 43, in which the Offset angle each 120 °, the distance angle 60 ° and the Cam angle is also 60 °.
  • a Switching corresponds to a 120 ° rotation angle of the camshaft 56.
  • the closed cam switch begins at a rotation angle of 30 ° to open.
  • the neighboring close the open cam switch.
  • the auxiliary contact opener ⁇ 1 of Figure 3 closes at the angle of rotation> 60 ° or closes with a delay when the armature is in its open position has reached.
  • the three switching cams 41, 42 and 43 drive associated changeover contacts 44, 45 and 46 on which on a connection side to one of the three phases L1, L2, L3 electrically are connected and their other connection sides to the in Figure 3 shown free connection of the button ⁇ 2 with the Labeling L1 / L2 / L3 are electrically connected.
  • a contactor drive 50 from armature 51, yoke 52, associated coil 53, shift rod 54, shift shaft 55 and Camshaft 56 shown.
  • the anchor opening path to it takes something to open the active cam switch more than 1/4 of the anchor stroke h, the factor "1/4" of Is the quotient of the degrees 30 ° / 120 ° in FIG. 4 but less than 1/2 of the anchor stroke according to the design specification H.
  • the auxiliary contact ⁇ 1 driven by the magnet armature 51 Figure 3 is designed so that the contact closure with an anchor opening travel> 1/2 x anchor stroke h. This is a somewhat overlapping switching of the active Cam switch and auxiliary contact excluded and the cam switch switches off when de-energized.
  • the three phases L1, L2 and L3 are not in the individual designated fuses on three triacs 61, 62 and 63 connected, whose control inputs via optocouplers 64, 65 and 66 are connected to RC elements 67, 68 and 69.
  • the associated triac 61, 62 or 63 is switched on and the connected outer conductor to the on / off switch 70 for the subsequent solenoid 75 of the contactor drive, the functionally corresponds to the contactor coil 31 in Figure 3, as Tax phase switched on.
  • Tax phase To switch the control phase the switching state of the auxiliary contact opener operated by the contactor drive ⁇ 1 queried.
  • pulse shaping becomes such carried out that the switch-on edge of outputs A1 to A3 delayed by approximately 50 ms and the switch-off edge immediately at the time of switching, i.e. with the change of contact position from "OPEN” to "CLOSED", the auxiliary contact opener ⁇ 1 takes place.
  • the outputs A1 to A3 of the shift register 71 or the associated one Pulse formers 72 in FIG. 7 are, for example, by Zener diodes locked so that when the supply voltage drops the electronics below a specified limit Control of the triac switch 61 to 64 of Figure 6 takes place. This rules out the possibility of irregular supply voltage a phase short circuit due to multiple control occurs.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)
  • Keying Circuit Devices (AREA)

Description

Die Erfindung bezieht sich auf ein mehrpoliges Schütz mit Wechselstromantrieb, mit einer Magnetspule, einem Magnetjoch mit Wirbelstromringen und einem beweglichen Magnetanker, bei welcher eine Phasenumschalteinrichtung zur Anschaltung der Steuerphase nach vorgebbaren Kriterien vorhanden ist (DE-A-10 40 105).The invention relates to a multi-pole contactor AC drive, with a magnetic coil, a magnetic yoke with eddy current rings and a movable magnet armature, at which a phase changeover device for switching on Tax phase is available according to predetermined criteria (DE-A-10 40 105).

Bei dreipoligen Schützen mit Wechselstromantrieb wird üblicherweise eine der drei Phasen der Hauptstromkreise als Steuerphase des Magnetantriebes benutzt. Wechselstrombetätigte Magnetantriebe von Schützen bestehen aus der Magnetspule, dem feststehenden Magnetjoch mit Wirbelstromringen und dem beweglichen Magnetanker, welcher einen Brückenträger für die Aufnahme der Schaltbrücken trägt.With three-pole contactors with AC drive is usually one of the three phases of the main circuits as the control phase of the magnetic drive used. AC operated Magnetic drives from shooters consist of the magnetic coil, the fixed magnetic yoke with eddy current rings and the movable one Magnetic anchor, which is a bridge girder for the recording the switch bridges.

Bei der statistischen Betätigung des Wechselstromantriebes erhält man bekannterweise keine Gleichverteilung der Ein- und Ausschaltzeitpunkte, sondern eine Selbstsynchronisation der Schaltzeitpunkte hinsichtlich der Steuerphase. Diese entsteht beim Einschalten durch die Abhängigkeit der magnetischen Ankerkraft bzw. beim Ausschalten durch die Abhängigkeit des Abklingens der Ankerkraft vom Phasenwinkel der Steuerphase. Als Folge ist die Häufigkeitsverteilung der Ein- und Ausschaltzeitpunkte bezogen auf den Phasenwinkel zwischen den drei Phasen der Hauptstromkreise um jeweils 120° elektrisch verschoben. Dadurch entsteht in den drei Hauptstromkreisen eine unterschiedliche Kontaktbelastung beim Einschalten, d.h. eine unterschiedliche Stromhöhe der Prellichtbögen, und beim Ausschalten, d.h. eine unterschiedliche Stromhöhe und Dauer der Ausschaltlichtbögen.With the statistical actuation of the AC drive it is known that no uniform distribution of the input and Switch-off times, but a self-synchronization of the Switching times regarding the control phase. This arises when switching on due to the dependence of the magnetic armature force or when switching off due to the dependence of decay the anchor force from the phase angle of the control phase. As The consequence is the frequency distribution of the switch-on and switch-off times based on the phase angle between the three Phases of the main circuits are electrically shifted by 120 °. This creates one in the three main circuits different contact loads when switching on, i.e. a different current levels of the arcing, and when switching off, i.e. a different current level and duration of the Switch-off arcs.

In der Praxis richtet sich das Wartungsintervall für den Austausch der Hauptkontaktstücke eines Schutzes nach dem Kontaktabbrand in der am stärksten belasteten Phase. Durch eine Vergleichmäßigung des Abstandes der Kontaktstücke bei den einzelnen Phasen könnte also die Lebensdauer eines Schutzes erhöht werden.In practice, the maintenance interval for the exchange is determined the main contact pieces of a protection after contact erosion in the most stressed phase. By a Uniformization of the distance between the contact pieces in the individual phases could therefore extend the lifespan of a protection increase.

Aus der DE-A-10 40 105 ist eine Phasenumschalteinrichtung für nahezu synchron im Stromnulldurchgang abschaltende Drehstromschaltgeräte, z.B. Schütze, bekannt, mit der handbetätigt oder selbsttätig derjenige Außenleiter des Drehstromnetzes als Steuerphase des Magnetantriebes ausgewählt wird, bei dem das sogenannte Schaltfeuer der Schützhauptkontakte am geringsten ist.From DE-A-10 40 105 is a phase switching device for three-phase switching devices that switch off almost synchronously in the zero current crossing, e.g. Sagittarius, known, with the hand-operated or automatically that phase conductor of the three-phase network is selected as the control phase of the magnetic drive in which the so-called switching fire of the main contactors is the lowest is.

Aufgabe der Erfindung ist es demgegenüber, bei einem mehrpoligen Schutz den Abbrand an den Kontaktstücken zu vergleichmäßigen.In contrast, the object of the invention is in a multipole Protection to even out the erosion on the contact pieces.

Die Aufgabe ist erfindungsgemäß bei einem mehrpoligen Schutz der eingangs genannten Art dadurch gelöst, daß mit der Phasenumschalteinrichtung die Steuerphase für den Magnetantrieb abwechselnd an eine der Phasen des Hauptstromkreises angeschlossen wird und daß die Phasenumschalteinrichtung beim Abschalten des Magnetantriebes betätigt wird. Vorzugsweise kann die Phasenumschalteinrichtung alternativ elektromechanisch oder aber elektronisch arbeiten.The task is according to the invention with a multi-pole protection of the type mentioned in that solved with the phase switching device the control phase for the magnetic drive alternately connected to one of the phases of the main circuit and that the phase changeover at Switching off the magnetic drive is actuated. Preferably the phase switching device can alternatively be electromechanical or work electronically.

Mit der Erfindung ist die Möglichkeit gegeben, die Selbstsynchronisation beim Schalten von Schützen zu vermeiden. Dadurch ist nunmehr eine weitgehend gleiche Materialausnutzung bei den Kontaktstücken gegeben.With the invention there is the possibility of self-synchronization to avoid when switching contactors. Thereby is now largely the same material utilization given the contact pieces.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Figurenbeschreibung von Ausführungsbeispielen anhand der Zeichnung in Verbindung mit den Patentansprüchen. Es zeigen

Figur 1 und Figur 2
zwei verschiedene Diagramme, die den Materialverlust der Hauptkontakte in Abhängigkeit von der Schaltzahl verdeutlichen,
Figur 3
einen elektronischen Steuerkreis für eine mechanische Phasenumschalteinrichtung,
Figur 4
einen dreiphasigen über Schaltnocken betätigten Umschalter,
Figur 5
einen bei Figur 4 verwendeten Nockenwellenantrieb,
Figur 6
eine elektronische Phasenumschalteinrichtung und
Figur 7
ein zu Figur 6 gehöriges Signallaufdiagramm mit einem Schieberegister.
Further details and advantages of the invention emerge from the following description of the figures of exemplary embodiments with reference to the drawing in conjunction with the patent claims. Show it
Figure 1 and Figure 2
two different diagrams that illustrate the material loss of the main contacts depending on the number of operations,
Figure 3
an electronic control circuit for a mechanical phase changeover device,
Figure 4
a three-phase change-over switch operated by switching cams,
Figure 5
a camshaft drive used in Figure 4,
Figure 6
an electronic phase switch and
Figure 7
a signal run diagram associated with Figure 6 with a shift register.

In den Figuren haben funktionsgleiche Teile gleiche Bezugszeichen. Die Figuren werden gruppenweise gemeinsam beschrieben. Parts with the same function have the same reference symbols in the figures. The figures are described together in groups.

Die Figur 1 zeigt die AC1-Prüfung und die Figur 2 die AC3-Prüfung eines bekannten dreipoligen Schutzes mit Wechselstromantrieb. Aufgetragen ist jeweils der Materialverlust der an den drei Phasen L1, L2 und L3 liegenden Hauptkontakten. Dabei kennzeichnet die Abszisse die Schaltzahl und die Ordinate den jeweiligen Materialverlust der Kontakte an den einzelnen Phasen.FIG. 1 shows the AC1 test and FIG. 2 shows the AC3 test a well-known three-pole protection with AC drive. The loss of material is shown in each case on the three main phases L1, L2 and L3. The abscissa marks the number of operations and the ordinate the respective loss of material of the contacts to the individual Phases.

Aus Figur 1 ergibt sich, daß als Folge der Selbstsynchronisation bei AC1-Betrieb (Einschaltstrom = Ausschaltstrom = 1 x Ie) der Materialabbrand in den einzelnen Phasen etwa im Verhältnis 1:1,6:2,9 entsteht. Figur 2 zeigt dagegen, daß bei annäherndem AC3-Betrieb (z.B. Einschaltstrom = 4 x Ie, Ausschaltstrom = 1 x Ie) das Verhältnis der Materialabbrandraten bei etwa 1:2:3 liegt.From Figure 1 it follows that as a result of the self-synchronization in AC1 operation (inrush current = inrush current = 1 x I e ), the material burn-up in the individual phases occurs approximately in the ratio 1: 1.6: 2.9. FIG. 2, on the other hand, shows that with approximately AC3 operation (for example inrush current = 4 x I e , inrush current = 1 x I e ) the ratio of the material burn-up rates is approximately 1: 2: 3.

Eine genaue Analyse der Figuren 1 und 2 führt zu dem Ergebnis, daß durch gleichmäßige Ausnutzung des Kontaktmaterials bei AC1-Betrieb ein relativer Materialabbrand von 1+1,6+2,9 / 3 = 1,85 und bei AC3-Betrieb ein relativer Materialabbrand von 1+2+3 / 3 = 2 erreicht werden könnte. Damit wäre eine Erhöhung der Schützlebensdauer um etwa 50 % gegeben.A precise analysis of Figures 1 and 2 leads to the result that by evenly using the contact material with AC1 operation a relative material burn-off of 1 + 1.6 + 2.9 / 3 = 1.85 and with AC3 operation a relative material burn-off of  1 + 2 + 3/3 = 2 could be achieved. That would be an increase given the contactor life by about 50%.

Um letzteres Ziel zu erreichen, kann zur Vermeidung der Selbstsynchronisation eine Phasenumschalteinrichtung entweder als elektromechanische oder als elektronische Schalteinrichtung aufgebaut und eingesetzt sein. Die Figuren 3 bis 5 zeigen eine elektromechanische Phasenumschalteinrichtung: Dabei ist ein Nockenantrieb vorhanden, welcher bei der Öffnungsbewegung des Magnetankers um einen definierten Drehwinkel weitergeschaltet wird. Indem die Phasenumschaltung während der Öffnungsbewegung des Magnetankers bei ausgeschalteter Magnetspule erfolgt, wird sichergestellt, daß das Umstellen der Steuerphase weitgehend stromlos erfolgt. To achieve the latter goal, you can avoid the Self synchronization a phase switching device either as electromechanical or as electronic switching device be built and used. Figures 3 to 5 show an electromechanical phase changeover device: there is a cam drive, which during the opening movement the armature by a defined angle of rotation becomes. By changing the phase during the Opening movement of the magnet armature when the magnet coil is switched off takes place, it is ensured that the changeover of the Tax phase is largely without current.

Im einzelnen ist in Figur 3 eine Sicherheitsschaltung 30 dargestellt, bei der eine Schützspule 31 einer Relaisspule 32 parallelgeschaltet ist. Von der Schützspule 31 wird ein Öffner-Hilfskontakt Ö1, von der Relaisspule 32 ein SchließerRelaiskontakt S1 angesteuert. Dem Öffner-Hilfskontakt Ö1 ist ein Taster S2 und ein weiterer Taster Ö2 zum Ein- und Ausschalten des Schützes nachgeschaltet. Durch eine solche Sicherheitsschaltung mit einem Relaiskontakt-Schließer wird das Schutz derart verriegelt, daß die Umschaltung von einer Phase zur nächsten Phase mit einer Strompause erfolgt. Durch letztere Maßnahme wird der Abbrand an den Umschaltkontakten vermieden und ein Phasenkurzschluß während des Umschaltens ausgeschlossen.A safety circuit 30 is shown in detail in FIG. 3, in which a contactor coil 31 is connected in parallel with a relay coil 32. A normally closed auxiliary contact Ö 1 is controlled by the contactor coil 31, and a normally open relay contact S1 by the relay coil 32. The NC auxiliary contact Ö1 is followed by a button S2 and another button Ö2 for switching the contactor on and off. With such a safety circuit with a relay contact closer, the protection is locked in such a way that the switchover from one phase to the next phase takes place with a power break. The latter measure avoids the erosion of the changeover contacts and precludes a phase short circuit during the changeover.

In Figur 4 ist eine Umschalteinrichtung 40 dargestellt, welche drei Schaltnocken 41, 42 und 43 enthält, bei denen der Versatzwinkel jeweils 120°, der Abstandswinkel 60° und der Nockenwinkel ebenfalls 60° betragen. Dies bedeutet, daß eine Umschaltung einen 120°-Drehwinkel der Nockenwelle 56 entspricht. Bei 30°-Drehwinkel beginnt der geschlossene Nockenschalter zu öffnen. Bei 90°-Drehwinkel beginnt der benachbarte, geöffnete Nockenschalter zu schließen. Der Hilfskontakt-Öffner Ö1 der Figur 3 schließt bei dem Drehwinkel > 60° bzw. schließt verzögert, wenn der Magnetanker seine Offen-Position erreicht hat.In Figure 4, a switching device 40 is shown, which contains three switching cams 41, 42 and 43, in which the Offset angle each 120 °, the distance angle 60 ° and the Cam angle is also 60 °. This means that a Switching corresponds to a 120 ° rotation angle of the camshaft 56. The closed cam switch begins at a rotation angle of 30 ° to open. At a 90 ° angle of rotation, the neighboring close the open cam switch. The auxiliary contact opener Ö1 of Figure 3 closes at the angle of rotation> 60 ° or closes with a delay when the armature is in its open position has reached.

Die drei Schaltnocken 41, 42 und 43 treiben zugehörige Umschaltkontakte 44, 45 und 46 an, welche an einer Anschlußseite an jeweils eine der drei Phasen L1, L2, L3 elektrisch angeschlossen sind und deren andere Anschlußseiten an den in Figur 3 dargestellten freien Anschluß des Tasters Ö2 mit der Kennzeichnung L1/L2/L3 elektrisch angeschlossen sind. Im Beispiel der Figur 4 ist der Taster Ö2 über den Umschaltkontakt 46 gerade an die Phase L3 angeschlossen.The three switching cams 41, 42 and 43 drive associated changeover contacts 44, 45 and 46 on which on a connection side to one of the three phases L1, L2, L3 electrically are connected and their other connection sides to the in Figure 3 shown free connection of the button Ö2 with the Labeling L1 / L2 / L3 are electrically connected. in the Example of Figure 4 is the button Ö2 on the changeover contact 46 just connected to phase L3.

In Figur 5 ist ein Schützantrieb 50 aus Anker 51, Joch 52, zugehöriger Spule 53, Schaltstange 54, Schaltwelle 55 und Nockenwelle 56 dargestellt. Zur sicheren Weiterschaltung der Schaltwelle 55 mit Drehwinkel 60° hat der Hub h des Ankers 51 gegenüber dem Schaltweg ein Übermaß. Der Ankeröffnungsweg bis zum Öffnen des aktiven Nockenschalters beträgt daher etwas mehr als 1/4 vom Ankerhub h, wobei sich der Faktor "1/4" vom Quotienten der Gradzahlen 30°/120° in Figur 4 herleitet, ist aber nach konstruktiver Vorgabe weniger als 1/2 vom Ankerhub h. Der vom Magnetanker 51 angetriebene Hilfskontakt Ö1 der Figur 3 ist konstruktiv so ausgelegt, daß das Kontaktschließen bei einem Ankeröffnungsweg > 1/2 x Ankerhub h erfolgt. Damit ist ein gewissermaßen überlappendes Schalten des aktiven Nockenschalters und des Hilfskontaktes ausgeschlossen und der Nockenschalter schaltet stromlos aus.In Figure 5, a contactor drive 50 from armature 51, yoke 52, associated coil 53, shift rod 54, shift shaft 55 and Camshaft 56 shown. For safe forwarding of the The shift shaft 55 with the angle of rotation 60 ° has the stroke h of the armature 51 an excess compared to the switching path. The anchor opening path to it takes something to open the active cam switch more than 1/4 of the anchor stroke h, the factor "1/4" of Is the quotient of the degrees 30 ° / 120 ° in FIG. 4 but less than 1/2 of the anchor stroke according to the design specification H. The auxiliary contact Ö1 driven by the magnet armature 51 Figure 3 is designed so that the contact closure with an anchor opening travel> 1/2 x anchor stroke h. This is a somewhat overlapping switching of the active Cam switch and auxiliary contact excluded and the cam switch switches off when de-energized.

In Figur 6 sind die drei Phasen L1, L2 und L3 über nicht im einzelnen bezeichnete Sicherungen an drei Triacs 61, 62 und 63 angeschlossen, deren Steuereingänge über Optokoppler 64, 65 und 66 an RC-Glieder 67, 68 und 69 angeschlossen sind. Durch die Ansteuerung eines einzigen Optokopplers 64, 65 oder 66 wird das zugehörige Triac 61, 62 oder 63 eingeschaltet und der angeschlossene Außenleiter dem Ein-/Ausschalter 70 für die nachfolgende Magnetspule 75 des Schützantriebes, die funktionsmäßig der Schützspule 31 in Figur 3 entspricht, als Steuerphase zugeschaltet. Zum Umschalten der Steuerphase wird der Schaltzustand des vom Schützantrieb betätigten Hilfskontakt-Öffners Ö1 abgefragt.In Figure 6, the three phases L1, L2 and L3 are not in the individual designated fuses on three triacs 61, 62 and 63 connected, whose control inputs via optocouplers 64, 65 and 66 are connected to RC elements 67, 68 and 69. By controlling a single optocoupler 64, 65 or 66 the associated triac 61, 62 or 63 is switched on and the connected outer conductor to the on / off switch 70 for the subsequent solenoid 75 of the contactor drive, the functionally corresponds to the contactor coil 31 in Figure 3, as Tax phase switched on. To switch the control phase the switching state of the auxiliary contact opener operated by the contactor drive Ö1 queried.

Figur 7 zeigt, daß beim Wechsel vom geöffneten in den geschlossenen Zustand des Hilfskontaktes der eingeschaltete Ausgang Ai (i = 1,2,3) eines 3-stufigen Schieberegisters 71 ausgeschaltet und der nächstfolgende Ausgang in der Schaltfolge A1-A2-A3-A1-A2... eingeschaltet wird. Zwischen den Ausgängen des Schieberegisters 71 und den Eingängen der Optokoppler 64 bis 66 der Figur 6 wird eine Impulsformung derart durchgeführt, daß die Einschaltflanke der Ausgänge A1 bis A3 um etwa 50 ms verzögert und die Ausschaltflanke unverzögert zum Umschaltzeitpunkt, d.h. mit dem Wechsel der Kontaktstellung von "OFFEN" auf "GESCHLOSSEN", des Hilfskontakt-Öffners Ö1 erfolgt. Damit wird ein Phasenkurzschluß zwischen den Triacs 61 bis 63 der Figur 6 vermieden. Der Zeitabstand zwischen dem Ausschaltkommando der Schützspule bzw. während des Abfalls des Ankers und dem nächsten Einschaltkommando der Schützspule von 50 ms gewährleisten einen sicheren Ausschaltzustand des Schutzes vor dem nächsten Einschaltkommando.Figure 7 shows that when changing from the open to the closed State of the auxiliary contact when switched on Output Ai (i = 1,2,3) of a 3-stage shift register 71 switched off and the next output in the switching sequence A1-A2-A3-A1-A2 ... is switched on. Between the exits of the shift register 71 and the inputs of the optocouplers 64 to 66 of FIG. 6, pulse shaping becomes such carried out that the switch-on edge of outputs A1 to A3 delayed by approximately 50 ms and the switch-off edge immediately at the time of switching, i.e. with the change of contact position from "OPEN" to "CLOSED", the auxiliary contact opener Ö1 takes place. This will cause a phase short between the Triacs 61 to 63 of Figure 6 avoided. The time interval between the switch-off command of the contactor coil or during the fall of the anchor and the next switch-on command of the Contactor coils of 50 ms ensure a safe switch-off state protection against the next switch-on command.

Die Ausgänge A1 bis A3 des Schieberegisters 71 bzw. des zugehörigen Impulsformers 72 in Figur 7 sind beispielsweise durch Zenerdioden verriegelt, so daß bei Absinken der Versorgungsspannung der Elektronik unter eine vorgegebene Grenze keine Ansteuerung der Triac-Umschalter 61 bis 64 der Figur 6 erfolgt. Damit ist ausgeschlossen, daß bei irregulärer Versorgungsspannung durch Mehrfachansteuerung ein Phasenkurzschluß auftritt.The outputs A1 to A3 of the shift register 71 or the associated one Pulse formers 72 in FIG. 7 are, for example, by Zener diodes locked so that when the supply voltage drops the electronics below a specified limit Control of the triac switch 61 to 64 of Figure 6 takes place. This rules out the possibility of irregular supply voltage a phase short circuit due to multiple control occurs.

Claims (13)

  1. Multipole contactor (50) with alternating-current drive, having a magnet coil (53), a magnet yoke (52) with eddy-current rings and a movable magnet armature (51), in which there is a phase-changeover device (40, 60) for connecting the control phase for the magnetic drive according to preselectable criteria, characterised in that by means of the phase-changeover device (40, 60) the control phase for the magnetic drive is connected by turns to one of the phases (L1, L2, L3) of the main circuit, and in that the phase-changeover device (40, 60) is actuated when the magnetic drive (50) is turned off.
  2. Multipole contactor according to claim 1, characterised in that the phase changeover device (40) operates electromechanically.
  3. Multipole contactor according to claim 1, characterised in that the phase-changeover device (60) operates electronically.
  4. Multipole contactor according to claim 2, characterised in that the multiphase connection of the phase-changeover device (40, 60) is effected on the infeed side of the main contactor circuits.
  5. Multipole contactor according to claim 2, characterised in that the phase-changeover device (40) contains a cam drive (41, 42, 43) which in the case of the opening movement of the magnet armature (51) is stepped on by a defined angle of rotation.
  6. Multipole contactor according to claim 5, characterised in that the phase-changeover device (40) is actuated by means of an operating shaft (55) with a given angle of rotation and in that the armature stroke (h) has an overmeasure in relation to the actuator travel of the operating shaft (55).
  7. Multipole contactor according to claim 6, characterised in that in the case of the opening movement of the magnet armature (51) the armature travel until the active cam controller (41, 44; 42, 45; 43, 46) opens is > 1/4 x armature stroke (h) and < 1/2 x armature stroke (h).
  8. Multipole contactor according to one of the claims 5 to 7, characterised in that a normally closed auxiliary contact (Ö1) is provided that is designed in such a way that in the case of the opening movement of the magnet armature (51) contact closure is effected in the case of armature travel > 1/2 x armature stroke (h).
  9. Multipole contactor according to claim 3, characterised in that the electronic phase-changeover device (60) contains three triacs (61, 62, 63), the control inputs of which are connected by way of optocouplers (64, 65, 66) to RC elements (67, 68, 69) at which a phase-displaced control voltage is tapped.
  10. Multipole contactor according to claim 9, characterised in that by means of activation of a respective optocoupler (64 to 66) the associated triac (61 to 63) is turned on and the connected outer conductor is connected to the on-off switch of the magnet coil as the control phase.
  11. Multipole contactor according to one of the claims 8, 9 and 10, characterised in that a multi-stage shift register (71) having a plurality of outputs (A1, A2, A3) is provided, with a respective output (A1, A2, A3) being switched over during the opening movement of the magnet armature (51) as a function of the change from the opened to the closed state of the auxiliary contact (Ö1).
  12. Multipole contactor according to claim 11, characterised in that the output pulses of the shift register (71) are fed to a pulse shaper (72).
  13. Multipole contactor according to claim 11 or 12, characterised in that the outputs (A1, A2, A3) of the shift register (71) and/or the pulse shaper (72) are locked by means of Zener diodes when the supply voltage is too small.
EP95930387A 1994-09-23 1995-09-11 Multi-pole contactor Expired - Lifetime EP0782758B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4434074A DE4434074A1 (en) 1994-09-23 1994-09-23 Multipole contactor
DE4434074 1994-09-23
PCT/DE1995/001241 WO1996009635A1 (en) 1994-09-23 1995-09-11 Multi-pole contactor

Publications (2)

Publication Number Publication Date
EP0782758A1 EP0782758A1 (en) 1997-07-09
EP0782758B1 true EP0782758B1 (en) 1998-07-29

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Application Number Title Priority Date Filing Date
EP95930387A Expired - Lifetime EP0782758B1 (en) 1994-09-23 1995-09-11 Multi-pole contactor

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EP (1) EP0782758B1 (en)
DE (2) DE4434074A1 (en)
WO (1) WO1996009635A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948551C1 (en) * 1999-10-08 2001-07-05 Siemens Ag Method for equalizing total erosions of an electromagnetic switching device and the corresponding electromagnetic switching device
DE10051161C1 (en) * 2000-10-16 2002-03-07 Siemens Ag Switching device contact wear reduction method uses delay of switching command used for electromagnetic operation of main contacts
US6956728B2 (en) * 2003-02-28 2005-10-18 Eaton Corporation Method and apparatus to control modular asynchronous contactors
DE102006014914B3 (en) * 2006-03-30 2007-10-04 Siemens Ag Electromechanically operated switchgear operating method, involves supplying supply voltage to electromechanical drive and controlling drive by control device, where supply voltage is alternating voltage or rectified alternating voltage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE522649A (en) * 1952-09-08
FR2536904B1 (en) * 1982-11-29 1985-11-08 Merlin Gerin ELECTRONIC CONTROL CIRCUIT FOR A MULTI-OPERATION APPARATUS EQUIPPED WITH AN ELECTROMAGNET MECHANISM
EP0558868A1 (en) * 1992-03-06 1993-09-08 ABUS Kransysteme GmbH &amp; Co. KG. Arrangement for a contact winding
US5440180A (en) * 1992-09-28 1995-08-08 Eaton Corporation Microprocessor based electrical contactor with distributed contactor opening

Also Published As

Publication number Publication date
DE59503009D1 (en) 1998-09-03
WO1996009635A1 (en) 1996-03-28
DE4434074A1 (en) 1996-03-28
EP0782758A1 (en) 1997-07-09

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