EP3422382B1 - Verfahren und steuerungsvorrichtung zum schalten eines schützes - Google Patents

Verfahren und steuerungsvorrichtung zum schalten eines schützes Download PDF

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Publication number
EP3422382B1
EP3422382B1 EP17178249.3A EP17178249A EP3422382B1 EP 3422382 B1 EP3422382 B1 EP 3422382B1 EP 17178249 A EP17178249 A EP 17178249A EP 3422382 B1 EP3422382 B1 EP 3422382B1
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EP
European Patent Office
Prior art keywords
contactor
control voltage
time
control device
switching
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EP17178249.3A
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English (en)
French (fr)
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EP3422382A1 (de
Inventor
Gunnar Johansson
Aravindh VISHNU
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ABB Schweiz AG
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ABB Schweiz AG
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Priority to EP17178249.3A priority Critical patent/EP3422382B1/de
Priority to CN201880040452.9A priority patent/CN110914949B/zh
Priority to PCT/EP2018/062912 priority patent/WO2019001841A1/en
Publication of EP3422382A1 publication Critical patent/EP3422382A1/de
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Publication of EP3422382B1 publication Critical patent/EP3422382B1/de
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Classifications

    • 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
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/86—Means for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts
    • 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
    • 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
    • H01H2009/566—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 with self learning, e.g. measured delay is used in later actuations

Definitions

  • the technology disclosed herein relates generally to the field of contactors used in electrical networks, and in particular to a method for switching a contactor, a control device for controlling the contactor, computer program and computer program product.
  • a contactor is an electrically controlled switch device that is used for switching an electrical load connected to an electric circuit.
  • the electrical load may, for instance, be a three-phase load.
  • the contactor comprises a contact unit, in turn comprising a number of main contacts, for instance, three main contacts.
  • the main contacts are configured such as to connect or disconnect the electrical load to/from a main electric network.
  • the contactor further comprises an actuating unit comprising a coil for actuating the main contacts.
  • the electronic control circuit of the contactor is used for controlling the voltage supplied to the coil.
  • a control voltage of the electronic control circuit is supplied by an electric circuit drawn from, for instance, one or two of three phases.
  • each of the main contacts connected to a respective one of the three phases may switch, i.e. open or close, at almost the same phase angle in many of its switching operations.
  • the electrical load or burden on each of the main contacts will therefore differ substantially, which results in substantially different arc energies. Consequently, the main contact that is the most electrically affected one is subject to higher erosion than the other two main contacts. Therefore, the thickness of the contact material of the most affected main contact may decrease faster. This leads to different, i.e. uneven, erosion levels of different main contacts.
  • the service time of the contactor is therefore limited by the main contact that fails first.
  • US 6671157 B1 discloses a method for effecting an electronic drive control of a drive coil of a protection system using an electronic device which comprises a microcontroller.
  • the aim is to increase the serviceable life of a protection system.
  • EP 2 856 483 B1 discloses a low voltage contactor and is an example on the above described contactor.
  • the contactor is used for disconnecting a three phase load from an electric power source.
  • the electronic control circuit controlling the voltage that is supplied to the coil implements a pre-arranged time point selection scheme and is adapted to select a time point from the pre-arranged time point selection scheme as a time delay and initiate an instant opening command based on the selected time point.
  • An objective of the present invention is to provide improvements in switching of a contactor. It is a particular objective to ensure uniform wear of all contacts of the contactor, thereby prolonging the service time of the contactor.
  • the objective is according to an aspect achieved by a method for switching a contactor.
  • the method is performed by a control device controlling a control voltage supplied to a coil of the contactor.
  • the coil is energized and de-energized to control the switching of contacts of the contactor.
  • the method comprises the steps as claimed in claim 1.
  • the method provides a number of advantages. For instance, erosions and heat generated by electric arcs are distributed evenly on each of the contacts in a deterministic way, which increases the service life of the contactor.
  • the method also provides a reduced product cost by enabling a decrease of the amount of silver typically used in these contacts.
  • the method comprises obtaining the delay time ⁇ T from a predetermined set of N values, by selecting from the set a delay time ⁇ T that is different than the preceding selected delay time ⁇ T.
  • This gives non-random, i.e. deterministic, starting points, which in turn ensures switching at different points along the voltage forms, thereby ensuring to largest extent equal wear on the main contacts.
  • the starting point of the delay time ⁇ T may thus be related to, for instance, the start up-time and an off-set time, which, for instance, may comprise time for initiation of electronics etc.
  • the estimating the period Tp of the control voltage comprises one of:
  • the period Tp of the control voltage is determined independently of the reference point of time t1.
  • the obtaining measurements on the control voltage for the duration of the measuring interval Tm is de-synchronized with zero crossings of the period of the control voltage.
  • the obtaining measurements comprise accumulating root means square, RMS, values. In other embodiments, the obtaining measurements comprise accumulating mean values.
  • the criterion for switching the contactor is one of: the control voltage falling below a lower bound nominal voltage value for a predetermined time period, the control voltage falling below a lower bound nominal voltage value for more than 30 ms, a switch command having been stable for a predefined time period and a switch command having been stable for 4 ms.
  • the objective is according to an aspect achieved by a computer program for a control device for controlling a contactor.
  • the computer program comprises computer program code, which, when run on at processing circuitry of the control device causes control device to perform the method as above.
  • a computer program product comprises a computer program as above and a computer readable means on which the computer program is stored.
  • the objective is according to an aspect achieved by a control device for switching a contactor.
  • the control device controls a control voltage supplied to a coil of the contactor.
  • the control device is configured to energize and de-energize the coil to control the switching of contacts of the contactor, the control device being further configured to obtain a time point from a time point selection scheme comprising a plurality of time points distributed in a half period of the control voltage, initiate switching of the contactor using the obtained time point as a time delay, and upon determining that a criterion for switching the contactor is met, initiate an instant switching command at same time point on the half period of the control voltage as the obtained time point.
  • the method comprises: determining a reference point of time t1 based on a delay time ⁇ T wherein a starting point of the delay time ⁇ T is set in relation to a start-up of the method, estimating a period Tp of the control voltage, determining a duration of a measuring interval Tm based on the estimated period Tp of the control voltage, setting starting point of a first measuring interval Tm based on the reference point of time ti, and setting starting points of subsequent measuring intervals equal to end point of an immediately preceding measuring interval, obtaining measurements on the control voltage for the duration of the measuring interval Tm, and switching the contactor based on measurements made during the measuring interval Tm.
  • FIG. 1 illustrates a contactor 1 and a control device 20 for switching the contactor 1 according to embodiments of the invention.
  • the contactor 1 is a low-voltage contactor and is used for connecting and disconnecting an electric load 2.
  • the electric load 2 may, for instance, be a motor, but it is noted that the electric load 2 can be of any type.
  • the electric load 2 is connected to a main electric network having one or more phases. In the particular illustrated case the main electric network has three phases L1, L2, L3, but it may, in other embodiments, have one, two, four or more phases.
  • the contactor 1 is thus an electrically controlled switch used for switching an electrical circuit or electrical device with high current ratings.
  • the contactor 1 is controlled by an electronic control device 20 (in the following also denoted control circuit 20) having a much lower power level than the electric circuit or device (i.e. load 2) that is being switched by the contactor 1.
  • the control circuit 20 is configured to control a voltage, or more generally a power, that is supplied to a coil 10 of the contactor 1.
  • the contactor 1 comprises contacts, i.e. the current carrying part of the contactor 1, and a mechanism (for instance an electromagnet or coil) for closing and opening these contacts.
  • the contactor 1 illustrated in figure 1 comprises three main contacts 12 1 , 12 2 , 12 3 (although it is noted that there could be more or fewer main contacts as well) connected to a respective one of the three phases L1, L2, L3 of the main electric network.
  • the contactor 1 further comprises an actuating unit 3 comprising a coil 10 and a first magnet core 16 and a second magnet core 14.
  • the first magnet core 16 is a fixed magnet core 16 and the second magnet core 14 is a movable magnet core 14.
  • the coil 10 is typically wound around a part of the fixed magnet core 16.
  • Each of the main contacts 12 1 , 12 2 , 12 3 comprises a fixed contact and a movable contact, wherein each movable contact is connected to the movable core 14.
  • the coil 10, the fixed magnet core 16 and the movable magnet core 14 are arranged for actuating the main contacts 12 1 , 12 2 , 12 3 and thereby perform connection and disconnection operations.
  • the contactor 1 may also comprise a demagnetization circuit, which speeds up the opening of the contactor 1.
  • the contactor 1 When the contactor 1 is "open” it is in a non-conducting position, and when it is “closed” it is conducting, i.e. the main electric network (and hence the electric load) are in normal operation. It is noted that the contactor 1 may be "normally-open” or "normally-closed”; the “normal” state is when the coil 10 is de-energized. As long as current passes through the coil 10 a magnetic field is produced, which attracts the movable magnet core 14 to the fixed magnet core 16. When the contactor coil 10 is de-energized, gravity or a spring returns the movable magnet core 14 to its initial position and opens the main contacts 12.
  • the main electric network is used as supplier of a voltage to the control circuit 20, wherein the voltage supply is shown (in figure 1 ) to comprise a connection to a neutral and a connection to one of the phases Li.
  • the voltage to the electronic control circuit 20 can be provided in other ways as well, for example from two of the three phases or from a transformer (not shown) that is connected between the control circuit 20 and e.g. two of the phases of the main electric network.
  • the present invention provides a method and a control device for switching the contactor 1 as described above, for operating a load 2, for instance a three-phase load.
  • the contactor 1 comprises an actuating unit 3 comprising a coil 10, wherein main contacts 12 1 , 12 2 , 12 3 are operated by the coil 10 and the control circuit 1 for controlling a control voltage supplied to the coil 10.
  • the invention provides an improved way of initiating switching commands when controlling the coil 10 of the contactor 1.
  • Low voltage is commonly defined in a range of up to about 1000V AC.
  • FIG 2 illustrates a phase voltage U mains (along y-axis) of the main electric network as a function of time (x-axis).
  • This phase voltage is the voltage that the main contacts 12 1 , 12 2 , 12 3 are exposed to.
  • the voltage used for controlling the contactor 1 (denoted control voltage) is typically derived from the main voltage U mains (of the electric network).
  • the decision to switch the contactor 1, i.e. decision to close or open the contactor 1, is based on measurements on the control voltage. For instance, a mean value or a Root-Mean-Square (RMS) value of the main electric network instantaneous voltage or true RMS value or RMS value based on the amplitude of U mains or RMS value based on the mean value can be calculated based on the measurements, so the switching command (opening/closing command) can only be given when the RMS or mean value (or other suitable value). has been calculated.
  • the RMS or mean value is calculated at the end of a sliding window (shown in figure 3 ).
  • an initial variable delay ⁇ T is used. In figure 2 , this delay is illustrated as a time period ⁇ T.
  • the contactor switching command is given by the control circuit 20.
  • the duration of the delay ⁇ T should be evenly distributed within the control voltage half period.
  • the delay ⁇ T should have a different value than the delay ⁇ T used in the preceding switching.
  • FIG. 3 illustrate main aspects and different embodiments of the present invention.
  • the control circuit 20 In order to determine if the contactor 1 should be switching, the control circuit 20 is arranged to keep track of the supply voltage. Therefore, the control circuit 20 continuously measures the control voltage (which, as noted, is a fraction of the voltage U mains ) and determines the RMS value of the voltage amplitude. As has been noted earlier, an alternative to determining the RMS value is to instead determine the mean value or some other measure, but in the following the RMS value is used as an example for describing embodiments of the invention. A first process continuously measures and filters the half period of the control voltage waveform and a second process uses the filtered period as input for calculating an updated, i.e. a current, RMS value.
  • a demagnetization circuit is activated. For example, it may be decided to switch the contactor 1 when the voltage has been below 55% of the lower bound nominal voltage for more than 1, 2, 3 or more measurement intervals (each of which may, for instance, be about 30 ms) or when a programmable logic controller (PLC) switch command has been stable for a defined time period, e.g. stable for 4ms. It is however noted that other criteria may be used for deciding when the contactor 1 should open the electrical circuit, and such criteria may, for instance, depend on the application at hand.
  • PLC programmable logic controller
  • the control voltage values are accumulated during a measuring interval Tm.
  • the half period Tp of the control voltage is measured and filtered (denoted "first process" earlier). This may, for instance, be done by use of an infinite impulse response (IIR) filter.
  • the half period Tp is simply the time that passes between, for instance, two consecutive zero crossings (or between two consecutive maximum values) and this value is fed into the IIR filter.
  • halfPeriod filt 1 4 ⁇ halfPeriod new + 3 4 ⁇ halfPeriod prev wherein:
  • the half period Tp is continuously calculated and is used as input in order to know for how long time the control voltage values should be accumulated during the measuring interval Tm (denoted "second process" earlier). Since the voltage waveform is either alternating current (AC) or rectified AC or direct current (DC), the voltage values accumulated during the (sliding) measuring interval Tm would be equal to voltage values accumulated between two consecutive zero crossings (or, as noted earlier, between two consecutive maximum values).
  • the case with DC may be treated with a time-out period that is longer than an expected maximum period for possible AC voltages, and time-out value may then set equal to the period. As a particular example: the period for a 50 Hz AC voltage is 20 ms, i.e. the half period is 10 ms, and the time-out value may then be set e.g. to about 12 ms.
  • uppermost graph at time point t0, the process is started, and at the time point ti, voltage and threshold accumulators are reset.
  • a RMS value is calculated based on control voltage amplitude values that has been accumulated during a first measuring interval Tm (between t1 and t2), and using the filtered half period as input.
  • a new RMS value is again calculated based on voltage amplitude values accumulated during a second measuring interval Tm (between t2 and t3), and the filtered half period as input, and so on until a switching command is issued.
  • the lowermost graph of figure 3 illustrates that in a subsequent initiation of the method 30, a different delay value ⁇ T is obtained from the set of N such delay values.
  • the measuring interval Tm therefore starts at a different point on the voltage waveform (later point in the illustrated example).
  • the voltage is only positive because it is rectified in, for instance, a printed circuit board (PCB) and then input to control device 20.
  • PCB printed circuit board
  • An electronic control circuit for controlling voltages supplied to the coil is provided for (e.g. configured to perform the steps):
  • An advantage of the method is that as soon as the measuring result is obtained and a switching command (opening or closing command) should to be issued, the command can be issued immediately.
  • Figure 4 is a flow chart over steps of an embodiment of a method for switching a contactor according to an embodiment of the invention.
  • a method 30 for switching a contactor 1 is provided.
  • the method 30 is performed by a control device 20 arranged for controlling a control voltage supplied to a coil 10 of the contactor 1, wherein the coil 10 is energized and de-energized to control the switching of the contactor 1.
  • the method 30 comprises determining 31 a reference point of time t1 based on a delay time ⁇ T wherein a starting point of the delay time ⁇ T is set in relation to a starting point t0 of the method 30.
  • the reference point of time t1 (see e.g. figure 3 ) may, for instance, be set equal to the sum of the time point to at start-up of the method 30 (e.g. at initial start-up of the contactor 1 or when performing a switching operation) and the value of the delay time ⁇ T.
  • the reference point of time t1 will be at a different point along the half period graph over the control voltage.
  • the delay time ⁇ T may have a value within the interval of 0-10 ms.
  • the method 30 comprises estimating 32 a period Tp of the control voltage.
  • the half period and hence the period can be estimated by determining time period between two consecutive zero crossings or the time period between two consecutive maximum values of the control voltage waveform.
  • the estimation of the period Tp of the control voltage is made essentially independently of the reference point of time t1. That is, there is essentially no synchronization, which gives a more even wear of the main contacts.
  • the method 30 comprises determining 33 a duration of a measuring interval Tm based on the estimated period Tp of the control voltage.
  • the duration of the measuring interval Tm, during which measurements are to be made, may be set equal to the duration of the estimated period Tp of the control voltage.
  • the method 30 comprises setting 34 starting point of a first measuring interval Tm based on the reference point of time t1 and setting starting points of subsequent measuring intervals equal to the end point of an immediately preceding measuring interval.
  • the starting point of the first measuring interval Tm is equal to ti, which in turn is equal to t0 + delay ⁇ T.
  • the end point t2 of the first measuring interval is also the starting point of the second measuring interval, and so on.
  • the method 30 comprises obtaining 35 measurements on the control voltage for the duration of the measuring interval Tm.
  • the method 30 comprises switching 36 the contactor 1 based on measurements made during the measuring interval Tm.
  • a decision to switch (open or close) the contactor 1 is based on the measurements on the control voltage. This decision is taken at the end of the measuring interval Tm.
  • the delay time ⁇ T is obtained from a predetermined set of N values, from which set a delay time ⁇ T different than the preceding delay time ⁇ T is selected.
  • another value from the set of values is selected. This can be made by cyclically traversing all values, or by ensuring in some other deterministic way that the same delay time ⁇ T is not used for consecutive switching operations.
  • the obtaining of the delay time ⁇ T may, for instance, comprise retrieving a value from a predetermined table (stored in e.g. a database or data storage accessible to the control device), and then traversing all available values in any order until all values have been used before starting to re-use the delay time ⁇ T values.
  • a predetermined table stored in e.g. a database or data storage accessible to the control device
  • the method 30 initiates the switching of the contactor 1 and instant switching commands based on a pre-arranged time point selection scheme that comprises a plurality of time points distributed in a half period of the control voltage of the control circuit 1, the instant switching commands are distributed to each of the main contacts 12. Erosions and heat generated by arcs are thereby distributed evenly on each of the one or more main contacts 12 1 , 12 2 , 12 3 in a deterministic way, which increases the service life of the contactor 1.
  • the time point selection scheme for a half period of control voltage may comprise following time points corresponding to the sequence: ⁇ (0°, 60°, 120°), (10°, 70°, 130°), (20°, 80°, 140°), (30°, 90°, 150°), (40°, 100°, 160°), (50°, 110°, 170°) ⁇ .
  • the scheme comprises six groups.
  • the pre-determined interval in this sequence in each group is 60°, while the pre-defined offset for the corresponding time points of two successive groups is 10°.
  • the pre-defined offset is calculated based on a phase angle in a range of 5°-15° in order to have a complete coverage of the main contacts 12 1 , 12 2 , 12 3 so that opening commands are initiated and distributed on each of the main contacts 12 1 , 12 2 , 12 3 .
  • an offset calculated based on a phase angle 30° will result in only two different groups, which does not enable well-distributed opening commands on each of the main contacts 12 1 , 12 2 , 12 3 .
  • control device 20 is provided.
  • the control device 20 is configured to perform the embodiments of the described method 30.
  • the control device 20 comprises processing circuitry 21, which may be any combination of one or more of a suitable central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), etc., capable of executing software instructions stored in a computer program product 22, e.g. in the form of a storage medium 22.
  • the processing circuitry 21 may further be provided as at least one application specific integrated circuit (ASIC), or field programmable gate array (FPGA).
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the processing circuitry 21 is configured to cause the control device 20 to perform a set of operations, or steps, e.g. as described in relation to figure 4 .
  • the storage medium 22 may store the set of operations
  • the processing circuitry 21 may be configured to retrieve the set of operations from the storage medium 22 to cause the control device 20 to perform the set of operations.
  • the set of operations may be provided as a set of executable instructions.
  • the processing circuitry 21 is thereby arranged to execute the various embodiments of the method 30 as disclosed herein.
  • the storage medium 22 may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the control device 20 may also comprise an input/output means 24 for receiving data input and for outputting data, e.g. receiving information and/or sending commands/instructions.
  • the control device 20 may also comprise circuitry such as voltage and threshold accumulators.
  • a control device 20 is thus provided for switching a contactor 1.
  • the control device 20 is arranged for controlling a control voltage supplied to a coil 10 of the contactor 1.
  • the control device 20 is configured to energize and de-energize the coil 10 to control the switching of contacts 12 1 , 12 2 , 12 3 of the contactor 1.
  • the control device 20 is further configured to:
  • the control device 20 may be configured to perform the above steps, and implement any of the described embodiments of the method 30, e.g. by comprising one or more processors 20 (or processing circuitry) and memory 21, the memory 21 containing instructions executable by the processor 20, whereby the control device 20 is operative to perform the steps.

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

Claims (10)

  1. Verfahren (30) zum Schalten eines Schützes (1), wobei das Verfahren (30) durch eine Steuereinrichtung (20) durchgeführt wird, die eine Steuerspannung, die an eine Spule (10) des Schützes (1) angelegt wird, steuert, die Spule (10) eingeschaltet und ausgeschaltet wird, um das Schalten von Kontakten (121, 122, 123) des Schützes (1) zu steuern, und das Verfahren (30) Folgendes umfasst:
    - Erhalten einer Verzögerungszeit ΔT aus einem vorgegebenen Satz von N Werten, wobei die erhaltene Verzögerungszeit ΔT von der vorhergehenden gewählten Verzögerungszeit ΔT verschieden ist,
    Bestimmen (31) eines Bezugszeitpunkts, t1, auf der Grundlage der erhaltenen Verzögerungszeit ΔT, wobei ein Startpunkt, t0, der Verzögerungszeit ΔT in Bezug auf eine Inbetriebnahme des Verfahrens (30) gesetzt wird,
    - Schätzen (32) einer Halbperiode, Tp, der Steuerspannung,
    - Bestimmen (33) einer Dauer eines Messintervalls, Tm, das gleich der Dauer der geschätzten Halbperiode Tp der Steuerspannung gesetzt ist,
    - Setzen (34) eines Startpunkts eines ersten Messintervalls Tm auf der Grundlage des Bezugszeitpunkts t1 und Setzen von Startpunkten nachfolgender Messintervalle gleich dem Endpunkt eines unmittelbar vorhergehenden Messintervalls,
    - Erhalten (35) angesammelter Messwerte der Steuerspannung für die Dauer der Messintervalle Tm und
    - Schalten (36) des Schützes (1) auf der Grundlage der angesammelten Messwerte, die während der Messintervalle Tm erstellt wurden.
  2. Verfahren (30) nach Anspruch 1, wobei der Startpunkt der Verzögerungszeit ΔT gleich der Inbetriebnahme des Schützes oder gleich der Inbetriebnahme des Schützes (1) mit einem hinzugefügten Zeitversatz ist.
  3. Verfahren (30) nach einem der vorhergehenden Ansprüche, wobei die Schätzung (32) der Halbperiode, Tp, der Steuerspannung Folgendes umfasst:
    - Detektieren von zwei aufeinanderfolgenden Nulldurchgängen der Steuerspannung und Schätzen der Halbperiode Tp, derart, dass sie gleich der Dauer zwischen den detektierten Nulldurchgängen ist, und
    - Detektieren von zwei aufeinanderfolgenden Maximalwerten der Steuerspannung und Schätzen der Halbperiode Tp, derart, dass sie gleich der Dauer zwischen den detektierten Maximalwerten ist.
  4. Verfahren (30) nach einem der vorhergehenden Ansprüche, wobei die Halbperiode, Tp, der Steuerspannung unabhängig vom Bezugszeitpunkt t1.
  5. Verfahren (30) nach einem der vorhergehenden Ansprüche, wobei das Erhalten (35) von Messwerten der Steuerspannung für die Dauer des Messintervalls Tm mit Nulldurchgängen der Periode der Steuerspannung desynchronisiert ist.
  6. Verfahren (30) nach einem der vorhergehenden Ansprüche, wobei das Erhalten (35) von Messwerten ein Ansammeln von Effektivwerten, RMS-Werten, umfasst.
  7. Verfahren (30) nach einem der vorhergehenden Ansprüche, wobei das Kriterium zum Öffnen des Schützes (1) eines der Folgenden ist: die Steuerspannung fällt für einen vorgegebenen Zeitraum unter einen unteren Nennspannungsbegrenzungswert, die Steuerspannung fällt für mehr als 30 ms unter einen unteren Nennspannungsbegrenzungswert, eine Öffnungsanweisung war für einen vorgegebenen Zeitraum stabil und eine Öffnungsanweisung war für 4 ms stabil.
  8. Computerprogramm (23) für eine Steuereinrichtung (20) zum Steuern eines Schützes (1), wobei das Computerprogramm (23) Computerprogrammcode umfasst, der, wenn er in einer Verarbeitungsschaltungsanordnung der Steuereinrichtung (20) ausgeführt wird, bewirkt, dass die Steuereinrichtung (20) das Verfahren (30) nach einem der Ansprüche 1-7 durchführt.
  9. Computerprogrammprodukt (22), das ein Computerprogramm (23) nach Anspruch 8 und ein computerlesbares Mittel, in dem das Computerprogramm (23) gespeichert ist, umfasst.
  10. Steuereinrichtung (20) Steuern eines Schützes (1), wobei die Steuereinrichtung (20) eine Steuerspannung, die an eine Spule (10) des Schützes (1) angelegt wird, steuert, die Steuereinrichtung (20) konfiguriert ist, die Spule (10) einzuschalten und auszuschalten, um das Schalten von Kontakten (121, 122, 123) des Schützes (1) zu steuern, und die Steuereinrichtung (20) ferner konfiguriert ist, das Verfahren nach einem der Ansprüche 1-7 durchzuführen.
EP17178249.3A 2017-06-28 2017-06-28 Verfahren und steuerungsvorrichtung zum schalten eines schützes Active EP3422382B1 (de)

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EP17178249.3A EP3422382B1 (de) 2017-06-28 2017-06-28 Verfahren und steuerungsvorrichtung zum schalten eines schützes
CN201880040452.9A CN110914949B (zh) 2017-06-28 2018-05-17 用于切换接触器的方法及控制装置
PCT/EP2018/062912 WO2019001841A1 (en) 2017-06-28 2018-05-17 METHOD AND DEVICE FOR CONTROLLING THE SWITCHING OF A CONTACTOR

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WO2001001431A1 (de) * 1999-06-25 2001-01-04 Siemens Aktiengesellschaft Ansteuerverfahren für ein schütz und hiermit korrespondierende schützschaltung
DE19935044A1 (de) * 1999-07-26 2001-02-01 Moeller Gmbh Verfahren zur elektronischen Antriebssteuerung
DE10029789C1 (de) * 2000-06-16 2001-10-11 Siemens Ag Verfahren zum Betrieb eines elektromagnetischen Schaltgeräts und elektromagnetisches Schaltgerät
CN104641438B (zh) * 2012-05-30 2017-06-30 Abb研究有限公司 用于切换接触器的方法和装置
US10141143B2 (en) * 2014-11-06 2018-11-27 Rockwell Automation Technologies, Inc. Wear-balanced electromagnetic motor control switching

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CN110914949A (zh) 2020-03-24
CN110914949B (zh) 2021-03-12
EP3422382A1 (de) 2019-01-02
WO2019001841A1 (en) 2019-01-03

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