EP0252808B1 - Steuer- und Kontrollvorrichtung für Schütze und entsprechendes Kontrollverfahren - Google Patents

Steuer- und Kontrollvorrichtung für Schütze und entsprechendes Kontrollverfahren Download PDF

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Publication number
EP0252808B1
EP0252808B1 EP87401521A EP87401521A EP0252808B1 EP 0252808 B1 EP0252808 B1 EP 0252808B1 EP 87401521 A EP87401521 A EP 87401521A EP 87401521 A EP87401521 A EP 87401521A EP 0252808 B1 EP0252808 B1 EP 0252808B1
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EP
European Patent Office
Prior art keywords
current
contactor
coil
armature
chopper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87401521A
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English (en)
French (fr)
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EP0252808A1 (de
Inventor
Mihail Macovschi
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ABB Control SA
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ABB Control SA
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Application filed by ABB Control SA filed Critical ABB Control SA
Priority to AT87401521T priority Critical patent/ATE93649T1/de
Publication of EP0252808A1 publication Critical patent/EP0252808A1/de
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Classifications

    • 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
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"
    • H01H9/167—Circuits for remote indication
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device
    • H01H47/325—Energising current supplied by semiconductor device by switching regulator

Definitions

  • the invention relates to a device for controlling and verifying a contactor, and more particularly to a device for controlling an electromechanical contactor designed to be supplied with alternating current, and for controlling (in the sense of a verification) the position of the movable armature of this contactor, as well as the corresponding control method.
  • AC contactors are generally smaller, at equal power, than DC contactors. They are therefore more practical, they consume less and they heat less. But they have a drawback: they tend to open during the zero crossing of the current value, and they make noise.
  • Document DE-A-2 513 043 describes a device for controlling a contactor operating in direct current, having the characteristics of the preamble of claim 1.
  • This document also describes a method for controlling the position of the armature of a contactor operating in direct current, consisting in making an indirect measurement of the inductance of the contactor coil.
  • One of the aims of the invention is to propose a control circuit enabling a contactor constructed to be supplied with alternating current to be used under a direct current supply, the control circuit-contactor assembly having the advantages of the contactor in alternative without having the disadvantages.
  • Another object of the invention is to propose a circuit and a method for controlling (in the sense of a verification) a contactor proceeding by measuring the intensity in the coil to verify whether the armature is glued or not .
  • the subject of the invention is a device for controlling an electromechanical contactor with armature, as defined in claim 1.
  • a contactor symbolized by its coil 1, carrying in parallel a freewheeling diode 2.
  • This contactor is constructed to be supplied with alternating current, but it is supplied with direct current by a power source 3,4.
  • This feeds in series the coil 1 of the contactor, a transistor 5 with its control circuit 6 and a resistor 7 which is disposed between the transistor 5 and the negative supply terminal 4.
  • the point common to the transistor 5 and to the resistance 7 is the measurement point 8 of the intensity of the current in the coil 1 during the conduction periods of the transistor 5.
  • This measurement point is connected to an input of a comparator 9 whose other input, corresponding to l reference intensity Ir1, Ir2 or Ir3 is supplied by a logic circuit 10 ⁇ via a digital-analog converter 12.
  • a clock 11 supplies the logic circuit 10 ⁇ with pulses of determined frequency.
  • the logic circuit 10 ⁇ is connected to the control circuit 6 of the transistor 5 by two wires: one 13, transmits the opening orders of the transistor 5, the other 14, the closing orders.
  • wires are not imperative, it is simply an electrical connection, the circuits being able to be integrated.
  • the logic circuit 10 ⁇ is capable of transmitting at its output 15 a signal corresponding to the state of the movable armature of the contactor: stuck or distant.
  • the logic circuit 10 ⁇ is capable of receiving remote-controlled commands to operate the contactor.
  • the power supply of the control circuit 6 is not shown in the drawing. It can be permanent, and then the device works by remote control; or it can be taken in parallel on the contactor, and in this case, when the contactor is energized, there is a general reset.
  • the transistor 5 operates as a chopper with a fixed frequency and a variable duty cycle.
  • Resistor 7, of low value which transforms current information into voltage information, is crossed by the current in the coil only during the conduction periods of transistor 5; when transistor 5 is blocked, diode 2 fulfills its role of freewheeling diode. In this way, a substantially constant mean current is maintained in the coil 1, which always flows in the same direction.
  • the thief of this average current is high during the duration of call of the movable armature of the contactor, and low during the duration of maintenance of the bonded armature.
  • the call duration is defined a priori depending on the contactor, with a certain safety margin. It is the value of the reference intensity Ir1 which defines the value of the average current in the coil 1 during the call duration.
  • the chopper begins to operate at a fixed frequency imposed by the logic circuit 10 ⁇ , and which, for the duration t1 of the call, is for example 1.875 kHz.
  • the current Ib in the coil therefore tends to rise and settle just below the value Ir1 imposed during the duration t1 of call.
  • the logic circuit 10 ⁇ imposes the low reference value Ir2, and the current in the coil is established just below this new reference value.
  • the frequency of the chopper is fixed, by the logic circuit 10, at a higher value, for example 15 kHz.
  • the control circuit 6 is for example a flip-flop which receives from the logic circuit 10 ⁇ the switching orders by the wire 13 and the re-switching orders by the wire 14.
  • duration t2 At the end of duration t2 there is a pause period of duration t3. During this pause, transistor 5 is blocked. At the same time, the reference value for the intensity is brought to the value necessary for the time period t4; this Ir3 value is approximately half of the Ir2 reference value.
  • the current in the coil depends only on the position of the movable armature, and on the reference value Ir2 imposed before the pause.
  • the inductance of the contactor is low and the current decreases rapidly and cancels. This is the case corresponding to the upper part of FIG. 3.
  • the logic circuit 10 ⁇ triggers the opening of the transistor 5.
  • the logic circuit 1O examines the output state of comparator 9.
  • the third line of FIG. 3 presents a pulse, in duration t4 , corresponding to the instant of this examination of the output state of the comparator 9.
  • the reference value being always Ir3, if the current in the coil has become practically zero, it has not yet had time to take a value greater than Ir3.
  • the logic circuit 10 ⁇ finds that the current in the coil is below the reference value Ir3, it deduces therefrom that the movable armature is not stuck, and it triggers a reset pulse (line 4, Figure 3) to general zero which re-triggers the initial process with reference value Ir1. Simultaneously, it sends by its output 15 a signal indicating that the reinforcement is not glued.
  • the logic circuit 10 ⁇ controls the transition to a maintenance phase of a duration (t1 + t2), with the reference value Ir2, and there is no general reset pulse on line 4, but the logic circuit 10 ⁇ sends on its output 15 a signal indicating that the armature is stuck.
  • the durations are not shown on the same scale for clarity of the drawing.
  • the durations t1 and t2 are each a few tens of milliseconds (68 for example)
  • the duration t3 is a few milliseconds (8.53 for example)
  • the duration t4 is a few microseconds (16.8 for example). In other words, on the scale of FIG. 3, the duration t4 is practically not visible.
  • FIG. 2 shows a second embodiment of the device for controlling and controlling a contactor.
  • the same references designate the same elements as in FIG. 1.
  • the main difference comes from the fact that instead of varying the reference according to the stage of operation, three comparators 9, 21, 22 are used, each receiving permanently , a reference, respectively Ir1, Ir2 and Ir3.
  • the output of the first two comparators 9, 21 is applied to an AND gate, 20 ⁇ , 18, respectively, which receives from the logic circuit 10 ⁇ a validation pulse during the corresponding duration, respectively t1 and t2.
  • the wire 13 always transmits the opening orders of the transistor 5, and the wire 14 transmits the general closing order during the pause time t3.
  • the third comparator 22 transmits its output state to a buffer memory 23.
  • This memory is read by the logic circuit 10 ⁇ during the pulse, transmitted by the wire 24, which intervenes during the duration t4 and which is shown diagrammatically on the third line of figure 3.
  • the advantages of the monitoring and control device according to the invention are, in particular, the following. Of the fact that a contactor built to be supplied with alternating current is used, this saves space, weight and consumption. Due to the fact that this contactor is supplied continuously via a chopper, the current in the coil is always in the same direction and the problems associated with the zero current crossing, that is to say the detachment of the armature.
  • the coils are calculated for a given supply voltage, and the coil must be changed if the supply voltage varies by around 10 ⁇ %. According to the invention, it is possible to accept, for the same coil, voltage ranges varying in the ratio from 1 to 10 ⁇ .
  • the measurement resistor 7 is placed in the immediate vicinity of the negative supply terminal 4, it is traversed by the current only during the opening periods of the chopper, which prevents it from heating.
  • a chopper with fixed frequency and variable duty cycle is used, which makes it possible to control the impression of noise associated with the operation of the chopper.
  • a lower chopper frequency (approximately 1.8 kHz) is used to transmit more power to the coil to ensure bonding of the armature.
  • a higher chopper frequency (approximately 15 kHz) is used, beyond the audible range to eliminate the impression of noise linked to the operation of the chopper. Switching between call and hold frequencies for the chopper has at the same time as the switching between call and hold reference values, for the intensity.
  • the contactor is supplied with a high power and low frequency supply for calling and bonding the movable armature, and a low power and high frequency supply for maintaining it.
  • each contactor operating cycle (duration: t1 + t2) is followed by a pause (duration t3) at the end of which the position of the movable armature is checked by comparison of the current in the coil with a reference value.
  • the result of this operation is used by the control system and / or transmitted remotely, and it allows the restarting process to be restarted if the movable armature is not glued.
  • the pause allows the current in the coil to evolve according to the position of the movable armature. Therefore, after the pause, the comparative measurement of the current with respect to the reference value corresponds to an indirect measurement of the inductance of the contactor coil, which is defined by the position of the movable armature.
  • the duration t1 has not been defined. This duration can be fixed and determined by the construction characteristics of the contactor. It then corresponds to the duration necessary to attract the movable frame, increased by a safety duration. It can also be variable and end when the movable frame is glued. This supposes that one can determine the moment of bonding of the reinforcement.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)
  • Selective Calling Equipment (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Control Of Direct Current Motors (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (8)

  1. Vorrichtung zum Steuern eines elektromechanischen Schütz mit Anker, das zur Speisung mit Wechselstrom gebaut ist, und zur Kontrolle der angezogenen oder entfernten Lage seines Ankers, mit einer Gleichstromquelle (3, 4) für Serienspeisung der Spule (1) des Schützes, eines mit seinem Steuerkreis als Zerhacker dienenden Transistors (5), und eines mit der negativen Klemme (4) verbundenen Widerstands (7); mit einem den Stromwert (Ib) in der Spule (1) mit einem der Bezugswerte (Iri, Ir2, Ir3) vergleichenden Komparator (9), und mit einer für das Schütz einen Arbeitszyklus definierenden Logik (10), dadurch gekennzeichnet, :
    - daß der den Strom in der Spule (1) kontrollierenden Transistor (5), während der Speisungsperioden der Spule (1) als Zerhacker, mit fester Frequenz und variablem Zyklusverhältnis, arbeitet,
    - daß während der leitenden Perioden des Transistors (5) der dem Widerstand (7) und dem Transistor (5) gemeinsame Punkt als Meßpunkt (8) für den Strom (Ib) in der Spule (1) verwendet ist , und
    - daß der Arbeitszyklus eine Speisungsperiode (t1 + t2) während dessen die Logik (10) den Zerhacker steuert, und eine Pause (t3) während dessen der Zerhacker blockiert ist, aufweist, nach der der Strom (Ib) in der Spule mit des kleinsten der Bezugswerte (Ir3) vergleicht wird, um die Lage, angezogene oder entfernte, des Ankers des Schützes zu kontrollieren.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß zum Steuern des Schützes die Logik (10) in der Speisungperiode (t1 + t2) des Schutzes eine erste Periode (t1) für das Anziehen des Ankers und eine zweite Periode (t2) für die Haltung des Ankers definiert.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Logik (10) außer des kleinsten der Bezugswerte (Ir3) die für die Kontrolle der Ankerlage bestimmt sind, noch zwei andere Strombezugswerte (Ir1, Ir2) definiert, wobei der erste (Ir1) diesen Werte der Bezugswert für die Ankeranziehung und der zweite (Ir2) der Bezugswert für die Ankerhaltung ist.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Logik (10) mehrere feste Arbeitsfrequenze für den Zerhacker definiert, von denen eine erste für die Ankeranziehungsperiode und eine zweite für eine Ankerhaltungsperiode.
  5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß zwei zusätzliche Komparatoren (21, 22) vorgesehen sind, wobei jeder der drei Komparatoren (9, 21, 22) einen von den durch die Logik gebildeten Bezugswerten (Ir1, Ir2, Ir3) verwendet, und der zweite zusätzliche Komparator (22) seinen Ausgangssignal an einen durch die Logik (10) gelesenen Pufferspeicher (23) überträgt.
  6. Verfahren zur Kontrolle der Lage des Ankers in einem elektromechanischen Schütz das zur Speisung mit Wechselstrom gebaut ist, wobei die Speisung durch einen Gleichstromszerhacker stattfindet, wobei die Kontrolle der angezogenen oder entfernten Lage des Schützankers mittels einer indirekten Messung der Induktanz in der Spule (1) des Schützes durchgeführt wird, dadurch gekennzeichnet:
    - daß die indirekte Messung der Induktanz in der Spule (1) des Schützes bei gleichmässigen Zeitintervallen durchgeführt wird,
    - daß die indirekte Messung am Ende einer Pausenperiode (t3) stattfindet, während dessen der Zerhacker ausgeschaltet ist, und
    - daß die indirekte Messung aus einer Messung der Stromstärke in der Spule und einem Vergleich mit einer Bezugsstromstärke (Ir3) besteht.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß am Ende der Pause den Vergleich des Stromwertes in der Spule (1) mit der Bezugsstromstärke (Ir3) nach einer kleinen Verzögerung durchgeführt ist, um den Einschwingzustand des Komparators bei der Einstellung zu verdecken.
  8. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Referenzstärke (Ir3) des Stroms etwa der Hälfte der durchschnittlichen Stromstärke (Ir2), die die Spule (1) durchströmt und die die Haltung des Ankers unterstützt, entspricht.
EP87401521A 1986-07-04 1987-07-01 Steuer- und Kontrollvorrichtung für Schütze und entsprechendes Kontrollverfahren Expired - Lifetime EP0252808B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87401521T ATE93649T1 (de) 1986-07-04 1987-07-01 Steuer- und kontrollvorrichtung fuer schuetze und entsprechendes kontrollverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8609741A FR2601191B1 (fr) 1986-07-04 1986-07-04 Dispositif de commande et de controle d'un contacteur et procede de controle correspondant
FR8609741 1986-07-04

Publications (2)

Publication Number Publication Date
EP0252808A1 EP0252808A1 (de) 1988-01-13
EP0252808B1 true EP0252808B1 (de) 1993-08-25

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ID=9337085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401521A Expired - Lifetime EP0252808B1 (de) 1986-07-04 1987-07-01 Steuer- und Kontrollvorrichtung für Schütze und entsprechendes Kontrollverfahren

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EP (1) EP0252808B1 (de)
AT (1) ATE93649T1 (de)
DE (1) DE3787132T2 (de)
ES (1) ES2042592T3 (de)
FR (1) FR2601191B1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0386300A1 (de) * 1989-03-10 1990-09-12 Siemens Aktiengesellschaft Integrierbare Schaltungsanordung zur Ansteuerung eines mit Gleichstrom betriebenen Relais
US5204633A (en) * 1992-02-25 1993-04-20 International Business Machines Corporation Electromagnetic contactor with closure fault indicator
FR2696599B1 (fr) * 1992-10-07 1994-12-09 Alsthom Gec Contacts auxiliaires pour appareil électrique.
DE9406446U1 (de) * 1993-06-25 1994-11-03 Siemens Ag Ansteuerbaustein zur Ansteuerung eines Schützes
DE9409759U1 (de) * 1993-06-25 1994-10-27 Siemens Ag Schaltungsanordnung zur Realisierung eines konstanten Schütz-Haltestroms
DE4321252C2 (de) * 1993-06-25 1996-09-12 Siemens Ag Schaltungsanordnung zur Ansteuerung eines Schützes
SE515261C2 (sv) * 1995-06-12 2001-07-09 Abb Research Ltd Kontaktorutrustning
SE505747C2 (sv) * 1996-02-07 1997-10-06 Asea Brown Boveri Kontaktorutrustning
FR2846783B1 (fr) * 2002-11-06 2005-01-28 Schneider Electric Ind Sas Methode et dispositif de pilotage d'un appareil interrupteur
CN101510485B (zh) * 2009-03-20 2011-04-06 厦门理工学院 全宽电压接触器控制器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678344A (en) * 1971-02-25 1972-07-18 Gte Automatic Electric Lab Inc Electromagnetic relay operation monitor
DE2513043A1 (de) * 1975-03-25 1976-10-07 Baum Elektrophysik Gmbh Schaltung zum gleichstrombetrieb fuer schuetze oder relais

Also Published As

Publication number Publication date
ATE93649T1 (de) 1993-09-15
EP0252808A1 (de) 1988-01-13
FR2601191A1 (fr) 1988-01-08
FR2601191B1 (fr) 1988-10-21
DE3787132D1 (de) 1993-09-30
DE3787132T2 (de) 1994-03-31
ES2042592T3 (es) 1993-12-16

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