EP3230990B1 - Dispositif de démagnétisation et procédé de démagnétisation d'un noyau de transformateur - Google Patents

Dispositif de démagnétisation et procédé de démagnétisation d'un noyau de transformateur Download PDF

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Publication number
EP3230990B1
EP3230990B1 EP15807664.6A EP15807664A EP3230990B1 EP 3230990 B1 EP3230990 B1 EP 3230990B1 EP 15807664 A EP15807664 A EP 15807664A EP 3230990 B1 EP3230990 B1 EP 3230990B1
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EP
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Prior art keywords
alternating signal
demagnetization
converter
time
transformer
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German (de)
English (en)
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EP3230990A1 (fr
Inventor
Ulrich Klapper
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Omicron Electronics GmbH
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Omicron Electronics GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase AC
    • H01F38/28—Current transformers
    • H01F38/32—Circuit arrangements

Definitions

  • the invention relates to a demagnetizing device and a method for demagnetizing converter cores.
  • the invention relates in particular to devices and methods for demagnetizing converter cores, which can be used when a DC current is impressed during a test of a switch, converter or other element of energy technology, which can lead to magnetization of the converter cores.
  • Converters are installed in many power engineering systems. Examples of such converters are current transformers.
  • the current transformers can be protective transformers, which can also be used to forward information about current in a primary system to secondary technology systems, for example to protective relays, even in the event of a fault.
  • the current transformers can also be measuring transformers that transmit information about currents in the primary system in normal operation. Examples of such secondary technology systems include measuring devices or displays of a control system.
  • the current transformers can be designed as transformers in which a primary conductor, for example a busbar, is passed through a current transformer.
  • a primary conductor for example a busbar
  • Several turns of a secondary side can be wound on one converter core.
  • a plurality of converter cores and a plurality of secondary windings wound thereon are frequently also used, the plurality of converters having a common primary conductor.
  • the transformer cores of the current transformers are only partially magnetized in normal operation. This applies in particular to protective transformers. If a converter core is premagnetized, the converter can be saturated by a fault current. Such a situation can occur, for example, when a current in the primary conductor is used to test a switch or another energy technology device embossed and the core is thereby premagnetized. This bears the risk that fault currents can no longer be reliably identified.
  • Protective devices for example protective relays, which are connected to the secondary side of the converter, can be triggered late or not at all in the event of a fault, which can result in major damage.
  • Documents JP H09 223628 and US 3,859,573 disclose a demagnetizing device according to the preamble of claim 1.
  • devices, systems and methods which demagnetize a converter core of a converter.
  • an alternating signal is fed in on a primary side of the converter.
  • a frequency and / or an amplitude of the alternating signal can be changed as a function of time.
  • the converter cores of all converters connected in series can be demagnetized at the same time. It is not necessary to make the secondary connections of all transducers connected in series accessible in order to demagnetize the transducer cores of the multiple transducers.
  • the alternating signal can be, for example, a sinusoidal signal, a square-wave signal, a triangular signal or another signal with a change of sign.
  • the alternating signal can be an alternating voltage or an alternating current.
  • the devices and methods can be set up such that only an alternating signal is applied to the primary side of the converter for demagnetization.
  • Demagnetization of the transducer core is understood here to mean a process with which the magnetization of the transducer core in the currentless state, which is also referred to as remanence, is reduced. It is possible, but not necessary, for the converter core to be completely demagnetized.
  • a demagnetizing device comprises the features of claim 1.
  • the demagnetization device can be configured as a device with a housing in which the source is arranged.
  • the demagnetization device can be designed as a mobile device.
  • the demagnetization device can be designed as a portable device.
  • the demagnetizing device can be set up to change an amplitude and / or a frequency of the alternating signal in a time-dependent manner to demagnetize the converter core.
  • the demagnetizing device can be set up to reduce the amplitude of the alternating signal in a time-dependent manner and / or to increase the frequency of the alternating signal in a time-dependent manner in order to demagnetize the converter core.
  • the demagnetizing device can be set up to generate the alternating signal for demagnetizing the converter core in such a way that a time integral of an amount of the alternating signal determined between two times at which two successive sign changes of the alternating signal take place changes as a function of time.
  • the alternating signal can have sign changes immediately following one another at a first time and a second time. At a third time and a fourth time, the alternating signal can have further immediately consecutive sign changes, the third time being later than the first time.
  • the demagnetizing device can be set up to change the alternating signal as a function of time so that the time integral of the amount of the alternating signal between the first time and the second time is greater than the time integral of the amount of the alternating signal between the third time and the fourth time.
  • the demagnetizing device can be set up to generate the alternating signal for demagnetizing the converter core so that the time integral decreases.
  • the demagnetization device comprises a measuring device for detecting a response of the converter to the alternating signal.
  • the demagnetization device is set up to change the alternating signal as a function of the response detected by the measuring device.
  • the converter and at least one further converter can have the same primary conductor.
  • the demagnetizing device can comprise a measuring device for detecting a response of the converter and the at least one further converter to the alternating signal.
  • the alternating signal can be an alternating voltage.
  • the answer can be a current flowing through the primary side.
  • the alternating signal can be an alternating current.
  • the answer can be a voltage drop across the primary.
  • the demagnetization device can be set up to change the alternating signal as a function of the response detected by the measuring device.
  • the demagnetization device can be set up to determine a change in amplitude and / or a change in frequency of the alternating signal as a function of the response detected by the measuring device.
  • the demagnetization device can be set up to detect the demagnetization of the transducer core depending on the response detected by the measuring device.
  • the measuring device can be coupled to the primary side of the converter.
  • the demagnetization device can be set up to carry out the demagnetization without being conductively connected to a secondary side of the converter. If the demagnetizing device demagnetizes a plurality of transducers at the same time, the demagnetizing device can be configured to carry out the demagnetization without being conductively connected to a secondary side of any of the plurality of transducers.
  • the demagnetizing device can be set up to carry out a resistance measurement on the primary side of the converter and to feed the alternating signal on the primary side of the converter to demagnetize the converter core after an end of the resistance measurement.
  • the demagnetization device can be set up to automatically perform the demagnetization after the resistance measurement.
  • the resistance measurement can be a micro-ohm measurement.
  • the resistance measurement can be carried out as a four-point measurement.
  • a system according to the invention comprises a converter which has a primary side, a secondary side and a converter core.
  • the system comprises a demagnetizing device according to claim 1.
  • the demagnetization device can only be connected to the primary side of the converter.
  • the converter can be a protective converter.
  • the converter can be a protective converter which is designed as a current converter.
  • the system can comprise a protective device of an energy system, which is connected to the secondary side of the converter.
  • the protective device can be a protective relay.
  • the converter can be arranged in a bushing.
  • the converter can be a bushing current transformer of a boiler switch.
  • the converter can be arranged in a gas-insulated switchgear (GIS).
  • GIS gas-insulated switchgear
  • a method according to the invention comprises the features of claim 14.
  • an amplitude and / or a frequency of the alternating signal can be changed as a function of time.
  • the amplitude of the alternating signal can be reduced as a function of time.
  • the frequency of the alternating signal can be increased as a function of time for demagnetizing the converter core.
  • the alternating signal can be generated in such a way that a time integral of an amount of the alternating signal determined between two times at which two successive sign changes of the alternating signal take place changes in a time-dependent manner.
  • the alternating signal can have sign changes immediately following one another at a first time and a second time. At a third time and a fourth time, the alternating signal can have further immediately consecutive sign changes, the third time being later than the first time.
  • the alternating signal can be changed as a function of time so that the time integral of the amount of the alternating signal between the first time and the second time is greater than the time integral of the amount of the alternating signal between the third time and the fourth time.
  • the method comprises detecting a response to the alternating signal.
  • the response can be a response from the converter to the alternating signal.
  • the response can be a response of the converter and at least one further converter, which have the same primary conductor, to the alternating signal.
  • the method comprises a time-dependent change of the alternating signal depending on the answer.
  • the alternating signal can be an alternating current and the response can include a voltage.
  • the AC signal may be an AC voltage and the response may include a current.
  • a change in amplitude and / or a change in frequency of the alternating signal can be determined depending on the detected response.
  • the demagnetization device can only be connected to the primary side of the transducer.
  • the converter can be arranged in a bushing.
  • the converter can be a bushing current transformer of a boiler switch.
  • the converter can be a protective converter.
  • the converter can be a current transformer which is designed as a protective transformer.
  • a protective device of an energy system can be connected to the secondary side of the converter.
  • the protective device can be a protective relay.
  • the method can be carried out with the demagnetization device or the system according to one exemplary embodiment.
  • a converter core of a converter can be demagnetized without the secondary side of the converter having to be made accessible.
  • Several converters that have the same primary conductor can be demagnetized in a simple manner. Changes in the alternating signal can be matched to a response of the converter to the alternating signal or a response of several converters to the alternating signal in order to carry out the demagnetization efficiently.
  • Devices, methods and systems according to exemplary embodiments reduce the risk that converters have strongly magnetized converter cores after a test procedure.
  • the risk of fault currents not being reliably recognized can be reduced.
  • Connections and couplings between functional units and elements shown in the figures can also be implemented as an indirect connection or coupling.
  • a connection or coupling can be implemented wired or wireless.
  • a converter core can be demagnetized.
  • an alternating signal is fed in on the primary side by a device that can be detachably connected to the primary side of the transformer.
  • the alternating signal is changed as a function of time in order to demagnetize the converter core.
  • several converter cores can also be demagnetized at the same time by impressing the alternating signal into a primary conductor which is common to several converters.
  • a frequency and / or an amplitude of the alternating signal can be changed as a function of time in order to demagnetize the converter core.
  • the frequency of the alternating signal can be increased.
  • the amplitude of the alternating signal can be reduced.
  • Frequency changes and / or amplitude changes of the alternating signal can be generated as a function of a response to the alternating signal, the response being able to be detected on the primary side of the converter. In this way, the magnetization of the transducer core can be reduced in an efficient and reliable manner.
  • the converter can be a protective converter.
  • a primary side can be a conductor of a primary system of an energy network, a power plant or a substation.
  • the secondary side of the converter or, if there are several converters, the secondary sides of the several converters can be coupled to a protective device of a secondary system.
  • the converter cores can be demagnetized, for example after a component of the primary system of the energy network has been tested, in such a way that fault currents are reliably detected without the need for electrically conductive connections to the secondary side of the converter or the converters for the demagnetization.
  • Figure 1 shows a system 1 with a device 40 according to an embodiment.
  • the device 40 is a demagnetizing device.
  • the device 40 can be a mobile device, in particular a portable device.
  • the device 40 can be designed to be releasably connected to a conductor of a primary side of a converter.
  • the device 40 can be designed to carry out both a procedure for testing a component of an energy system and a procedure for demagnetizing a converter core, which will be described in more detail below.
  • the system 1 comprises a component 2 of an energy system.
  • Component 2 can be a switch.
  • Component 2 can be a switch for high or medium voltage networks.
  • the switch can be a switch installed in a power plant or substation.
  • a boiler switch which has bushings 3 is shown as an example.
  • the device 40 can also be used in combination with other switches or other devices of a power plant, a substation or a supply network which have one or more converters.
  • Boiler switches can have bushings 3 in which one or more current transformers 10 are installed.
  • a current transformer 10 can have a transformer core 13. If the switch is tested by the device 40 or a testing device different from the device 40 by means of a micro-ohm measurement, a direct current can be impressed until the converter or the converters in the bushings 3 are completely saturated, so that the result of the micro-ohm measurement is not is more influenced by the converter or converters 10.
  • the converter core or the converter cores can be demagnetized in a simple manner, by impressing an alternating signal on the primary side. Access to the secondary side can be avoided during demagnetization. This reduces the amount of work involved, since no access to the secondary sides of the transformers is created and the current transformers do not have to be picked again in order to demagnetize the transformer core or the transformer cores.
  • the device 40 comprises a plurality of connections 31, 32 and a source 41 for an alternating signal.
  • the alternating signal can be applied to or impressed on a primary conductor of the converter 10 or more converters.
  • the source 41 can be a current source that is controllable to generate a direct current and / or an alternating current.
  • the source 41 can be controllable in order to generate alternating currents with several different frequencies.
  • Source 41 may be a voltage source that is controllable to generate a DC voltage and / or an AC voltage as a signal.
  • the source 41 can be controllable in order to generate AC voltages with several different frequencies.
  • the device 40 comprises further devices, for example one or more measuring devices 42 for detecting a response in response to the alternating signal.
  • the device 40 can comprise a control device 44 for automatic electrical control of the source 41.
  • the device 40 can comprise an evaluation device 45 for evaluating a response of the converter 10, which is recorded with the measuring devices 42.
  • the control device 44 and the evaluation device 45 can be implemented by an integrated semiconductor circuit 43 or a plurality of integrated semiconductor circuits 43.
  • the integrated semiconductor circuit 43 can comprise a controller, a microcontroller, a processor, a microprocessor, an application-specific special circuit or a combination of the components mentioned.
  • the control device 44 can be set up to control the source 41 in such a way that the alternating signal is changed as a function of time.
  • a frequency of the alternating signal can be increased and / or an amplitude of the alternating signal can be reduced.
  • the times and / or magnitude of frequency changes and / or amplitude changes can be determined as a function of a response that the measuring device 42 detects.
  • an alternating signal which can be an alternating current or an alternating voltage, with a variable frequency and / or variable amplitude is fed in on the primary side of the current transformer 10.
  • the primary side of the converter 10, which is the high current side, can be a solid conductor or a busbar which is guided once or several times through a converter core on which the secondary winding is wound. Demagnetization from this primary side is possible. Either the frequency or the amplitude of the alternating signal is varied.
  • the source 41 can be controlled so that the voltage-time area at the core is gradually reduced, for example by increasing the frequency and / or decreasing the amplitude, as will be described in more detail.
  • the several converter cores can be demagnetized simultaneously.
  • the several current transformers on a busbar or in a converter housing which are connected in series on the primary side, but can be connected completely independently on the secondary side.
  • the source 41 can have various configurations.
  • the source 41 can be set up to generate an alternating signal with a sinusoidal waveform.
  • the source 41 can be set up to generate an alternating signal with a triangular waveform, for example a sawtooth signal.
  • the source 41 can be configured to generate an alternating direct current or an alternating direct voltage.
  • the alternating signal can be a current that is impressed on the primary side.
  • the alternating signal can be a voltage that is applied to the primary side.
  • the measuring device 42 can be set up to detect the voltage caused on the converter or on the series arrangement of converters by the impressed alternating current. On the basis of the detected voltage, the evaluation device 45 can determine at which frequency which converter saturates. Dependent the frequency and / or the amplitude of the alternating signal can be changed therefrom. Good demagnetization can thus be achieved in a short time.
  • the measuring device 42 can be set up to detect the current caused on the converter or on the series arrangement of converters by the applied AC voltage. On the basis of the detected current, the evaluation device 45 can determine at which frequency which converter saturates. Depending on this, the frequency and / or the amplitude of the alternating signal can be changed. Good demagnetization can thus be achieved in a short time.
  • the secondary winding of the converter or the secondary windings of the several converters and the devices connected to them, such as protective relays, measuring devices or counting devices, as well as the control system need not be touched when the converter is demagnetized.
  • devices and methods can be used according to exemplary embodiments for demagnetizing transducers which are installed in a bushing 3 of a switch.
  • the devices and methods can be used to demagnetize multiple protection transducers at the same time without requiring access to the secondary sides of the protection transducers.
  • the devices and methods are not limited to this application.
  • Figure 2 is an illustration of a system 1 with a device 40 according to a further embodiment.
  • the device 40 is set up to demagnetize a plurality of converter cores simultaneously.
  • the system 1 comprises a converter 10 and at least one further converter 20.
  • the plurality of converters 10, 20 can be a plurality of protective converters which are installed in the same bushing or in different bushings of a boiler switch or another energy technology device.
  • a secondary winding 12 of the converter 10 is inductively coupled to the primary conductor 11.
  • the secondary winding 12 can be wound on a converter core 13 of the converter 10.
  • the converter core 13 can be an iron core.
  • Another secondary winding 22 of the further converter 20 is inductive with the primary conductor 11 coupled.
  • the further secondary winding 22 can be wound on a further converter core 23 of the further converter 20.
  • the further converter core 23 can be an iron core.
  • the primary conductor 11 can be designed for larger currents than the secondary windings 12, 22.
  • the primary conductor 11 can form the high current side, in which higher currents flow than in the secondary windings 12, 22.
  • the row arrangement as in Figure 2 can also comprise more than two transducers 10, 20.
  • device 40 may be used to simultaneously demagnetize the transducer cores of the plurality of transducers for a series arrangement of two, three or more than three transducers.
  • the device 40 can generate an AC voltage and apply it to the primary conductor, which is common to the plurality of transducers and which can be guided through the transducer cores of the plurality of transducers.
  • the device 40 can change the amplitude and / or frequency of the AC voltage as a function of time in order to demagnetize a plurality of converter cores at the same time.
  • the device 40 can generate an alternating current and feed it into the primary conductor, which is common to the plurality of transducers and which can be guided through the transducer cores of the plurality of transducers.
  • the device 40 can change the amplitude and / or frequency of the alternating current as a function of time in order to demagnetize a plurality of converter cores simultaneously.
  • the system can include a protective device 5, for example a protective relay, and / or a display of the line technology.
  • a protective device 5 for example a protective relay, and / or a display of the line technology.
  • One or more of the secondary windings 12, 22 can be connected to a protective device 5 of the energy system.
  • One or more of the secondary windings 12, 22 can be connected to the display of the line technology.
  • the system can include a switch 6 of the primary system.
  • the switch 6 can, for example, be a switch with an extinguishing gas, e.g. a auto blow switch, or another switch.
  • the protective device 5 can trigger the switch 6 as a function of a fault current which is detected by one of the converters 10, 20 or more of the converters 10, 20.
  • Figure 3 shows a hysteresis curve 50 of a converter core that can be demagnetized using devices and methods according to exemplary embodiments.
  • the magnetic flux density is shown as a function of the magnetic field strength.
  • the converter core is magnetized. Due to the high currents that can flow in such tests, the converter can go into saturation and have a high remanence when the test is completed.
  • the converter core can be located in an area 52 of the diagram 50, for example.
  • the magnetization of the converter core can lead to fault currents not always being recognized or not being detected sufficiently quickly.
  • the converter core can be demagnetized by feeding in an alternating signal, the frequency and / or amplitude of which can be controlled or regulated by the device 40.
  • the converter core can run through a path 51 in the hysteresis diagram in which the magnetization is reduced.
  • the converter core can be demagnetized to reliably detect fault currents.
  • the plurality of transducer cores can be demagnetized at the same time.
  • Figure 4 10 is a flow diagram of a method 60 that may be performed by an apparatus according to an embodiment.
  • a check of a device of a power supply system for example a switch
  • a current can be fed into a primary conductor.
  • the test can be carried out by the device 40 or a test device different therefrom.
  • the test may include a micro ohm measurement that measures a switch resistance when closed. At least one secondary side of a converter is inductively coupled to the primary conductor to form a converter.
  • a transducer core of the transducer is demagnetized.
  • an alternating signal is generated by the device 40 and fed in on the primary side of the converter.
  • the alternating signal is changed depending on the time around the converter core to demagnetize as referring to Figure 5 to Figure 13 is described in more detail.
  • the device 40 can be set up in such a way that the test in step 61 and the demagnetization in step 62 can be carried out sequentially without the need to change electrically conductive connections between the device 40 and the primary side of the converter.
  • a tester other than device 40 may be used to perform the test at step 61.
  • the alternating signal generated by the device 40 for demagnetizing the converter core can be an alternating current or an alternating voltage.
  • the alternating signal can have different signal forms, for example sinusoidal, sawtooth signal, square wave signal, etc.
  • the alternating signal can be changed as a function of time in such a way that a time integral of an amount of the alternating signal, determined in each case between times that correspond to successive changes in sign of the alternating signal, decreases as a function of time.
  • the alternating signal can be changed as a function of time in such a way that a time integral of an amount of the alternating signal, determined in each case between times which correspond to successive sign changes of the alternating signal, decreases monotonically as a function of time.
  • Figure 5 shows an alternating signal 70 that can be generated by the device 40 for demagnetizing the converter core.
  • the alternating signal can for example be sinusoidal or essentially sinusoidal.
  • a frequency of the alternating signal is increased as a function of time.
  • a time period 71 between times t 1 , t 2 , at which successive sign changes of the alternating signal 70 take place, can be longer than a time period 72 between further times t 3 , t 4 , at which further successive sign changes of the alternating signal 70 take place, at least one of the other times t 3 , t 4 is later than time t 2 .
  • the period between successive sign changes does not have to be reduced between each period.
  • Several periods of the same duration 71 can also be provided.
  • the device 40 can be set up in such a way that the time period between successive sign changes of the alternating signal 70 decreases monotonically as a function of time.
  • the length of time can, but need not, strictly decrease monotonically with time.
  • a time integral 74 of the amount of the alternating signal between the further times t 3 , t 4 is smaller than a time integral 73 of the amount of the alternating signal between the times t 1 , t 2 due to the frequency increase, with at least one of the further times t 3 , t 4 later is than the time t 2 .
  • the device 40 can be set up in such a way that the time integral of the amount of the alternating signal, determined between successive sign changes of the alternating signal 70, decreases monotonically as a function of time.
  • the time integral may, but need not, decrease monotonically with time.
  • Figure 6 shows an alternating signal 75 that can be generated by the device 40 for demagnetizing the converter core.
  • the alternating signal can for example be sinusoidal or essentially sinusoidal.
  • An amplitude of the alternating signal is reduced as a function of time.
  • An amplitude 76 of a period of the alternating signal 75 between times t 1 , t 2 can be greater than an amplitude 77 between further times t 3 , t4, at least one of the further times t 3 , t 4 being later than the time t 2 .
  • the amplitude does not have to be reduced between each period.
  • the alternating signal 75 can also have several periods of the same amplitude 76.
  • the device 40 can be set up in such a way that the amplitude of the alternating signal 75 decreases monotonically as a function of time.
  • the amplitude can, but need not, decrease monotonically over time.
  • a time integral 74 of the amount of the alternating signal between the further times t 3 , t 4 is smaller than a time integral 73 of the amount of the alternating signal between the times t 1 , t 2 , with at least one of the further times t 3 , t 4 later is than the time t 2 .
  • the device 40 can be set up in such a way that the time integral of the magnitude of the alternating signal, determined between successive changes in the sign of the alternating signal 75, decreases monotonically as a function of time due to the reduction in amplitude.
  • the time integral may, but need not, decrease monotonically with time.
  • Figure 7 shows an alternating signal 78 that can be generated by the device 40 for demagnetizing the converter core.
  • the alternating signal can for example be sinusoidal or essentially sinusoidal. Both a time-dependent frequency increase and a time-dependent amplitude decrease take place, as is done with reference to FIG Figure 5 and Figure 6 has been described.
  • the device 40 can be set up in such a way that the amplitude of the alternating signal 78 decreases monotonically as a function of time and that the frequency of the alternating signal 78 increases monotonically as a function of time.
  • the frequency can, but need not, increase monotonically over time.
  • the amplitude can, but need not, decrease monotonically over time.
  • a time integral 74 of the amount of the alternating signal between the further times t 3 , t 4 is smaller than a time integral 73 of the amount of the alternating signal between the times t 1 , t 2 due to the amplitude reduction and the frequency increase, wherein at least one of the further times t 3 , t 4 is later than time t 2 .
  • the device 40 can be set up in such a way that the time integral of the amount of the alternating signal, determined between successive changes in the sign of the alternating signal 78, decreases monotonically as a function of time due to the reduction in amplitude and the increase in frequency.
  • the time integral may, but need not, decrease monotonically with time.
  • Figure 8 shows an alternating signal 80 that can be generated by the device 40 for demagnetizing the converter core.
  • the alternating signal can be an alternating direct signal, for example, which has the form of a square-wave signal with an alternating sign. A frequency of the alternating signal is increased as a function of time.
  • a time period 81 between times t 1 , t 2 at which successive signs of the alternating signal 80 occur can be longer than a time period 82 between further times t 3 , t 4 , at which further successive sign changes of the alternating signal 80 take place, at least one of the further times t 3 , t 4 being later than the time t 2 .
  • the period between successive sign changes does not have to be reduced between each period.
  • Several periods of the same duration 81 can also be provided.
  • the device 40 can be set up in such a way that the time period between successive sign changes of the alternating signal 80 decreases monotonically as a function of time.
  • the length of time can, but need not, strictly decrease monotonically with time.
  • a time integral 84 of the amount of the alternating signal between the further times t 3 , t 4 is smaller than a time integral 83 of the amount of the alternating signal between the times t 1 , t 2 due to the frequency increase, with at least one of the further times t 3 , t 4 later is than the time t 2 .
  • the device 40 can be set up in such a way that the time integral of the amount of the alternating signal, determined between successive sign changes of the alternating signal 80, decreases monotonically as a function of time.
  • the time integral may, but need not, decrease monotonically with time.
  • Figure 9 shows an alternating signal 85 which can be generated by the device 40 for demagnetizing the converter core.
  • the alternating signal can be an alternating direct signal, for example, which has the form of a square-wave signal with an alternating sign. An amplitude of the alternating signal is reduced as a function of time.
  • An amplitude 86 of a period of the alternating signal 85 between times t 1 , t 2 can be greater than an amplitude 87 between further times t 3 , t 4 , at least one of the further times t 3 , t 4 being later than the time t 2 .
  • the amplitude does not have to be reduced between each period.
  • the alternating signal 85 can also have several periods of the same amplitude 86.
  • the device 40 can be set up in such a way that the amplitude of the alternating signal 85 decreases monotonically as a function of time.
  • the amplitude can, but need not, decrease monotonically over time.
  • a time integral 84 of the amount of the alternating signal between the further times t 3 , t 4 is smaller than a time integral 83 of the amount of the alternating signal between the times t 1 , t 2 , with at least one of the further times t 3 , t 4 later due to the amplitude reduction is than the time t 2 .
  • the device 40 can be set up in such a way that the time integral of the magnitude of the alternating signal, determined between successive changes in the sign of the alternating signal 85, decreases monotonically as a function of time due to the reduction in amplitude.
  • the time integral can, but does not have to decrease strictly monotonically with time.
  • Figure 10 shows an alternating signal 88 that can be generated by the device 40 for demagnetizing the converter core.
  • the alternating signal can be an alternating direct signal, for example, which has the form of a square-wave signal with an alternating sign. Both a time-dependent frequency increase and a time-dependent amplitude decrease take place, as is done with reference to FIG Figure 8 and Figure 9 has been described.
  • the device 40 can be set up in such a way that the amplitude of the alternating signal 88 decreases monotonically as a function of time and that the frequency of the alternating signal 88 increases monotonically as a function of time.
  • the frequency can, but need not, increase monotonically over time.
  • the amplitude can, but need not, decrease monotonically over time.
  • a time integral 84 of the amount of the alternating signal between the further times t 3 , t 4 is smaller than a time integral 83 of the amount of the alternating signal between the times t 1 , t 2 due to the reduction in amplitude and the frequency, at least one of the further times t 3 , t 4 is later than time t 2 .
  • the device 40 can be set up in such a way that the time integral of the magnitude of the alternating signal, determined between successive changes in the sign of the alternating signal 88, due to the reduction in amplitude and the increase in frequency decreases monotonically as a function of time.
  • the time integral may, but need not, decrease monotonically with time.
  • device 40 may be configured to determine times at which the alternating signal is changed and / or the manner in which the alternating signal is changed, depending on a response of the converter to the alternating signal.
  • the evaluation device 45 can record the response of the converter. The answer can be recorded on the primary conductor 11. If the secondary sides of a plurality of transducers are connected to the primary conductor 11, the response of the plurality of transducers to the alternating signal can be recorded on the primary conductor 11.
  • the demagnetization can be carried out in a particularly efficient manner.
  • Figure 11 shows how the time integral over the magnitude of the alternating signal, determined in each case between two successive sign changes in the alternating signal, can be changed by the device 40 as a function of time.
  • Times 91, 92, 93 at which the alternating signal is changed can be automatically determined by the device 40 depending on the response of the converter or the plurality of converters to the alternating signal.
  • Periods 94, 95, for which the amplitude and / or frequency of the alternating signal remains unchanged, can be automatically determined by the device 40 depending on the response of the transducer or the plurality of transducers to the alternating signal.
  • Changes 96, 97 of the time integral, the frequency and / or the amplitude of the alternating signal can be automatically determined by the device 40 depending on the response of the transducer or the plurality of transducers to the alternating signal.
  • the device 40 can also be set up to recognize, depending on the response of the transducer or the plurality of transducers to the alternating signal, that the transducer core or the transducer cores no longer demagnetize Need to become.
  • the feeding of the alternating signal for demagnetization can be terminated depending on the response of the transducer or the multiple transducers to the alternating signal.
  • Figure 12 10 is a flow diagram of a method 100 according to an embodiment.
  • the method 100 can be carried out automatically by the device 40.
  • a device 40 is releasably connected to a component of an energy supply system or energy generation system.
  • the component can be a switch, for example a boiler switch, or another unit of the primary system of the energy supply system or energy generation system.
  • the component is checked.
  • the test may include measuring a switch's resistance when closed.
  • the test can be carried out as a micro-ohm measurement.
  • a current in particular a direct current, flows through a primary conductor of a converter.
  • the current can be provided by the device 40 and fed into the primary conductor.
  • the converter has a converter core through which the primary conductor can be guided.
  • the converter has a secondary winding that can be wound on the converter core.
  • the test at step 102 can be carried out with a test device that is different from the device 40.
  • step 103 it is checked whether a converter core should be demagnetized.
  • the check at step 103 can include that the device 40 monitors whether demagnetization is triggered by a user input on a user interface of the device 40.
  • the check at step 103 may include that a type of the component under test is detected. Depending on the type of component being tested, demagnetization may or may not be performed automatically. For example, the demagnetization can be carried out automatically for a type of the component under test, for example a TPX core.
  • Information about the relevant configuration of the component can be stored in a non-volatile manner in the device 40. The user can use a user interface to enter the component to which the device 40 is connected.
  • the demagnetization can be carried out automatically or not. If the converter core is not to be demagnetized, this could be the case for a TPZ core, for example, the method can end in step 109.
  • step 104 an alternating signal is generated by the device 40 to demagnetize the converter core.
  • the alternating signal is fed in on the primary side of the converter.
  • the alternating signal can be fed in without having to change connections between the device 40 and the component of the energy supply system or energy generation system between the test at step 103 and the demagnetization at steps 104 to 108.
  • a response of the converter to the alternating signal can be detected.
  • the answer can be recorded on the primary side of the converter. If there are several converters whose secondary windings are inductively coupled to the same primary conductor, the response of the several converters to the alternating signal can be recorded. The answer can be recorded on the primary side. The response can be recorded without a connection to the secondary winding of one of the converters having to be established in order to record the response.
  • the check at step 106 may include a threshold comparison of the detected response or a parameter derived therefrom with one or more threshold values.
  • the check can include that a magnetization of the transducer core or the transducer cores is determined depending on the detected response. For this purpose, for example, a phase shift between the alternating signal and the response can be determined. Depending on the magnetization, it can be determined whether the alternating signal should be changed. If the alternate signal is not to be changed, the method continues at step 108.
  • step 107 the alternating signal is changed if it is determined in step 106 that the alternating signal is to be changed.
  • a point in time at which the alternating signal is changed can be determined depending on the answer detected in step 105.
  • it can be determined, depending on the response recorded in step 105, by how much an amplitude of the alternating signal is to be changed.
  • detected response can be determined by how much a frequency of the alternating signal is to be changed.
  • step 108 it is checked whether the transducer core is sufficiently demagnetized.
  • the converter core does not have to be completely demagnetized.
  • a termination criterion can be checked, which ensures that, for example, fault currents from protective transformers are reliably detected.
  • the termination criterion can include an evaluation of the answer recorded in step 105.
  • the termination criterion can be selected in such a way that a threshold value for the integral of the signal is reached or undershot. If the transducer core is not yet sufficiently demagnetized, the method returns to step 104. If the termination criterion is met, the method can end at step 109.
  • the device can then be uncoupled from the component of the energy supply system or energy generation system.
  • FIG 10 is a block diagram of a device 40 according to an embodiment.
  • the device 40 may include a DC power source 111.
  • the DC power source 111 can be controlled such that a resistance measurement or another test is carried out on a component of a power supply system or power generation system.
  • a voltage can be detected with a voltmeter 42.
  • An ammeter 112 can be connected in series with the direct current source 111 or integrated in the direct current source 111.
  • An output signal of the ammeter 112 can be used for current regulation of the output current of the direct current source 111.
  • a first controllable switch 113 and a second controllable switch 114 can be provided to generate the alternating signal.
  • the first controllable switch 113 and the second controllable switch 114 can be operated under the control of the control device 44 in such a way that a sign of the current at the outputs 32 alternates. In this way, the alternating signal can be generated as an alternating direct signal.
  • a current or voltage source can be used which can be controlled in such a way that it works either as a DC signal source or as an AC signal source.
  • the source for the alternating signal can be integrated in a housing 49 of the device 40.
  • the device 40 may have a user interface 46. Via the user interface 46, a user can determine whether demagnetization of one or more converter cores is carried out. Via the user interface 46, a user can make inputs that are automatically evaluated by the device 40 in order to determine whether demagnetization of one or more converter cores should be carried out.
  • a procedure for demagnetization which comprises the supply of an alternating signal on the primary side, can be carried out automatically
  • the device and the method according to exemplary embodiments can also be used if the demagnetization is carried out separately from a test of the component of the power plant or energy supply system.
  • a response of the converter to the alternating signal can be recorded on the primary side, it is also possible to record the response on the secondary side.
  • Apparatus, methods and systems according to exemplary embodiments reduce the risk that fault currents are not reliably identified after a test has been carried out on a component of a power plant or energy supply system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Testing Relating To Insulation (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measurement Of Current Or Voltage (AREA)

Claims (15)

  1. Dispositif de démagnétisation, comprenant
    des raccordements (31, 32) destinés à relier de manière amovible le dispositif de démagnétisation (40) à un côté primaire (11) d'un transformateur (10, 20),
    une source (41 ; 111, 113, 114) qui est conçue pour, dans le but de démagnétiser un noyau de transformateur (13, 23) du transformateur (10, 20), introduire un signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) sur le côté primaire (11) du transformateur (10, 20) par l'intermédiaire des raccordements (31, 32),
    caractérisé par
    un dispositif de mesure (42) destiné à détecter une réponse du transformateur (10, 20) au signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88),
    lequel dispositif de démagnétisation (40) est conçu pour modifier le signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) en fonction de la réponse détectée avec le dispositif de mesure (42).
  2. Dispositif de démagnétisation selon la revendication 1,
    dans lequel le signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) est un courant alternatif et la réponse comprend une tension.
  3. Dispositif de démagnétisation selon la revendication 1,
    dans lequel le signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) est une tension alternative et la réponse comprend un courant.
  4. Dispositif de démagnétisation selon l'une quelconque des revendications précédentes,
    dans lequel le dispositif de démagnétisation (40) est conçu pour, dans le but de démagnétiser le noyau de transformateur (13, 23), modifier une amplitude et/ou une fréquence du signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) en fonction du temps.
  5. Dispositif de démagnétisation selon la revendication 4,
    dans lequel le dispositif de démagnétisation (40) est conçu pour, dans le but de démagnétiser le noyau de transformateur (13, 23), réduire l'amplitude du signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) en fonction du temps et/ou augmenter la fréquence du signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) en fonction du temps.
  6. Dispositif de démagnétisation selon l'une quelconque des revendications précédentes,
    dans lequel le dispositif de démagnétisation (40) est conçu pour, dans le but de démagnétiser le noyau de transformateur (13, 23), produire le signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) de telle sorte qu'une intégrale dans le temps (73, 74 ; 83, 84) d'une valeur du signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88), déterminée entre deux instants auxquels ont lieu deux changements de signe successifs du signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88), varie en fonction du temps.
  7. Dispositif de démagnétisation selon la revendication 6,
    dans lequel le dispositif de démagnétisation (40) est conçu pour, dans le but de démagnétiser le noyau de transformateur (13, 23), produire le signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) de telle sorte que l'intégrale dans le temps (73, 74 ; 83, 84) diminue.
  8. Dispositif de démagnétisation selon l'une quelconque des revendications précédentes,
    comprenant un dispositif de mesure (42) destiné à la détection de la réponse du transformateur (10) et au moins d'un autre transformateur (20), qui présentent le même conducteur primaire (11), au signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88).
  9. Dispositif de démagnétisation selon l'une quelconque des revendications précédentes,
    dans lequel le dispositif de démagnétisation (40) est conçu pour spécifier une variation d'amplitude et/ou une variation de fréquence du signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) en fonction de la réponse détectée avec le dispositif de mesure (42).
  10. Dispositif de démagnétisation selon l'une quelconque des revendications précédentes,
    dans lequel le dispositif de démagnétisation (40) est conçu pour reconnaître la démagnétisation du noyau de transformateur (13, 23) en fonction de la réponse détectée avec le dispositif de mesure (42).
  11. Dispositif de démagnétisation selon l'une quelconque des revendications précédentes,
    dans lequel le dispositif de mesure peut être couplé au côté primaire (11) du transformateur (10, 20) dans le but de détecter la réponse.
  12. Dispositif de démagnétisation selon l'une quelconque des revendications précédentes,
    dans lequel le dispositif de démagnétisation (40) est conçu pour effectuer une mesure de résistance au niveau du côté primaire (11) du transformateur (10, 20) et pour, après la fin de la mesure de résistance, introduire le signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) sur le côté primaire (11) du transformateur (10, 20) dans le but de démagnétiser le transformateur (13, 23).
  13. Système, comprenant
    un transformateur (10, 20), qui présente un côté primaire (11), un côté secondaire (12, 22) et un noyau de transformateur (13, 23), et
    un dispositif de démagnétisation (40) selon l'une quelconque des revendications précédentes.
  14. Procédé de démagnétisation d'un noyau de transformateur (13, 23) d'un transformateur (10, 20), comprenant les étapes de
    liaison d'un dispositif de démagnétisation (40) à un côté primaire (11) du transformateur (10, 20), et
    démagnétisation du noyau de transformateur (13, 23) du transformateur (10, 20),
    dans lequel la démagnétisation du noyau de transformateur (13, 23) comprend :
    la production d'un signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) par le dispositif de démagnétisation (40) et l'introduction du signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) sur le côté primaire (11) du transformateur (10, 20),
    caractérisé en ce
    qu'une réponse au signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) est détectée, et
    que le signal alternatif (70 ; 75 ; 78 ; 80 ; 85 ; 88) est modifié en fonction de la réponse détectée.
  15. Procédé selon la revendication 14,
    dans lequel le procédé est mis en œuvre avec le dispositif de démagnétisation (40) selon l'une quelconque des revendications 1 à 12.
EP15807664.6A 2014-12-09 2015-12-09 Dispositif de démagnétisation et procédé de démagnétisation d'un noyau de transformateur Active EP3230990B1 (fr)

Priority Applications (1)

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PL15807664T PL3230990T3 (pl) 2014-12-09 2015-12-09 Urządzenie do odmagnesowania i sposób odmagnesowania rdzenia przetwornika

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ATA50892/2014A AT516564A1 (de) 2014-12-09 2014-12-09 Entmagnetisierungsvorrichtung und Verfahren zum Entmagnetisieren eines Wandlerkerns
PCT/EP2015/079087 WO2016091932A1 (fr) 2014-12-09 2015-12-09 Dispositif de démagnétisation et procédé de démagnétisation d'un noyau de transformateur

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KR (1) KR101939791B1 (fr)
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BR (1) BR112017011970B1 (fr)
CA (1) CA2969893C (fr)
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CN113241232B (zh) * 2021-06-03 2024-08-16 中车资阳机车有限公司 一种直流磁化退磁装置
CN116313379B (zh) * 2023-04-13 2024-05-07 东莞市宇丰磁电制品有限公司 一种用于磁片加工的充磁机及充磁方法
CN119694713B (zh) * 2024-12-31 2025-07-11 珅斯电子(上海)有限公司 霍尔电流传感器的消磁装置和消磁方法、控制装置

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BR112017011970A2 (pt) 2017-12-26
CA2969893C (fr) 2022-05-10
MX378832B (es) 2025-03-10
CA2969893A1 (fr) 2016-06-16
CN107548510A (zh) 2018-01-05
AU2015359448B2 (en) 2018-05-17
RU2676270C1 (ru) 2018-12-27
KR20170129683A (ko) 2017-11-27
CN107548510B (zh) 2019-10-15
ES2808854T3 (es) 2021-03-02
PL3230990T3 (pl) 2020-11-30
US10804020B2 (en) 2020-10-13
AT516564A1 (de) 2016-06-15
BR112017011970B1 (pt) 2022-08-09
WO2016091932A1 (fr) 2016-06-16
ZA201703935B (en) 2018-04-25
MX2017007419A (es) 2018-04-20
US20180261368A1 (en) 2018-09-13
AU2015359448A1 (en) 2017-06-29
EP3230990A1 (fr) 2017-10-18
KR101939791B1 (ko) 2019-01-18

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