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WO2019206993A1 - Procédé de fabrication d'un dispositif de mesure de courants alternatifs comprenant une bobine à air - Google Patents

Procédé de fabrication d'un dispositif de mesure de courants alternatifs comprenant une bobine à air Download PDF

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Publication number
WO2019206993A1
WO2019206993A1 PCT/EP2019/060506 EP2019060506W WO2019206993A1 WO 2019206993 A1 WO2019206993 A1 WO 2019206993A1 EP 2019060506 W EP2019060506 W EP 2019060506W WO 2019206993 A1 WO2019206993 A1 WO 2019206993A1
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WO
WIPO (PCT)
Prior art keywords
transmission device
air
signal
processor
coil
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.)
Ceased
Application number
PCT/EP2019/060506
Other languages
German (de)
English (en)
Inventor
Bernd Wittig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elpro GmbH
Original Assignee
Elpro GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Elpro GmbH filed Critical Elpro GmbH
Publication of WO2019206993A1 publication Critical patent/WO2019206993A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/08—Circuits for altering the measuring range
    • G01R15/09—Autoranging circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage

Definitions

  • the invention relates to a method for the production of a measuring arrangement with a 5 air coil comprising the steps of providing the air coil, the air coil having a terminal against which an output voltage generated in the air coil is applied, providing a transmission device, the transmission device having an input terminal is adapted to detect the output voltage of the air coil, and allows a direct connection of the output of the air coil to the 10 input terminal of the transmission device, as well as a measuring arrangement produced by the method.
  • Various methods are used in industry and the household to measure currents of AC-carrying conductors.
  • 15 arrangements with an air coil e.g. a Rogowski coil that achieves high accuracy in a wide dynamic range. They are manufactured in many different sizes, so that a wide range of applications is possible, from measurements directly on components on printed circuit boards to measurements on busbars or machine parts (bearing currents).
  • the voltages induced in the air-core coil are so small, in particular at low currents of the conductor through which the alternating current flows, that they must be subsequently converted and processed.
  • the measuring arrangement can usually be calibrated by a trimming device, usually by a potentiometer, which can be reached from outside the measuring arrangement.
  • the document DE 10 2010 012 834 A1 describes a measuring arrangement for measuring alternating currents of a conductor through which current flows.
  • the measuring arrangement can be connected to an air coil, in particular a Rogowski coil.
  • the measuring arrangement has an integrator circuit for generating a voltage signal proportional to the detected alternating current 30 and a voltage / current converter for generating of an output current.
  • the output current is proportional to the voltage signal generated by the integrator circuit.
  • This measuring arrangement has disadvantages.
  • the entire processing is consistently analog (temperature dependence, offset, aging). Due to the selected output currents in the ampere range, a high power loss occurs in the overall process.
  • the measuring arrangement is to be calibrated to the rated current by means of a usually manually adjustable trimming device (vibration sensitivity).
  • the method for producing a measuring arrangement with an air coil has five method steps.
  • the air coil is provided.
  • the air-core coil has a connection to which an output voltage generated in the air-core coil is applied.
  • a transmission device is provided.
  • the transmission device has an input connection which is suitable for detecting the output voltage of the air coil and for generating and / or outputting an impressed output current.
  • the transmission device has a memory.
  • the output of the air coil is galvanically connected to the input terminal of the transmission device.
  • the characteristic measured values of the measuring arrangement are detected.
  • the characteristic values and / or values of the air-core coil derived from the characteristic values are stored in the memory.
  • a processor is arranged in the transmission device.
  • the amplification takes place digitally by a programmable processor built into the transmission device, as well as the calibration to different nominal currents and the conversion of the digitally processable signal into a processed signal.
  • a function is stored in memory.
  • the function is chosen so that the output current of the transmission device is 100 mA.
  • the function also includes error correction of e.g. Offset, temperature.
  • the assembly of the air coil takes place.
  • the windings of the coil are usually made by hand.
  • the size of the air coil is adapted to the system to be measured.
  • the housing is closed.
  • the housing is sealed in such a way that it is watertight and dustproof so that the air coil can also be used in wet and dusty environments.
  • a filter device and / or a device for adjusting the signal level are arranged in the transmission device.
  • the filter device minimizes interference and noise.
  • the amplitude of the input voltage generated by the air coil is changed by the signal level adjustment device so as to amplify the small input voltage usually generated by the air coil.
  • the filter device and / or the device for adjusting the signal level are arranged in the transmission device in such a way that the filter device and / or the device for adjusting the signal level are connected between the input connection of the transmission device and the input connection of the processor.
  • a control of the device for adjusting the signal level in the transmission device is arranged, which connects the processor with the device for adjusting the signal level.
  • the device for adjusting the signal level is thus controlled by the processor.
  • a device for generating a digitally processable signal from an analog measurement signal in the transmission device is arranged.
  • a digitally processable signal may e.g. into a programmable logic controller (PLC), where the digitally processable signal is available to the user for further applications, e.g. for power or / and energy measurement.
  • PLC programmable logic controller
  • the device for generating a digitally processable signal from an analog measurement signal in the transmission device is arranged such that the device for generating a digitally processable signal from an analog measurement signal between the input terminal of the transmission device and the processor input is connected.
  • a device for generating an output signal in the transmission device is arranged.
  • the device for generating an output signal is suitable for generating an output signal from the processed signal.
  • the output signal can be an impressed output current, which can be passed, for example, into a measuring device, where it is available to the user for further use.
  • the device for generating an output signal is connected to the processor output.
  • a feedback in the transmission device is arranged, which connects the output of the device for generating an output signal to the processor.
  • the air coil forms a first structural unit and / or the transmission device forms a second structural unit.
  • the second unit can be mounted spatially separated from the first unit. Particularly dirt-intensive or humid environments, which may affect the function of the electronics of the second unit, can thus be avoided. But it is also possible a direct connection of the output of the air coil to the input terminal of the transmission device.
  • first structural unit and / or the second structural unit are arranged in an enclosure.
  • the components of the first unit and / or the second unit are protected by the housing against contamination, as they may occur during operation of the measuring arrangement.
  • the first assembly and / or the second assembly can thus also be installed in environments that require increased protection for electrical installations. Both units are also protected by the enclosures against manipulation.
  • the characteristic values of the measuring arrangement are detected.
  • the characteristics of the measuring arrangement include, among other things, the plant-specific rated current.
  • a ratio factor is determined from the characteristic values.
  • the transmission factor is chosen so that the output current of the transmission device is 100 mA.
  • the translation factor may also be set such that the output current of the transmitter has any other value.
  • the measuring arrangement according to the invention for measuring currents that vary over time has an air coil and a transmission device.
  • the air-core coil has a connection to which an output voltage generated in the air-core coil is applied.
  • the transmission device has an input terminal which is suitable for detecting the output voltage of the air coil.
  • the input terminal of the transmission device is directly connected galvanically to the connection of the air coil. Data can be stored in the transmission device.
  • the measuring arrangement according to the invention can be normalized to any nominal current.
  • the current-carrying conductor to be measured induces in the air-core coil a voltage which is proportional to the rate of change of the current.
  • This induced voltage is usually so low (several pV up to a few hundred mV) that it must be amplified.
  • the output measured value is usually given with reference to the rated current and a nominal frequency, e.g. 100 mV per 1000 A at 50Hz.
  • a very low current of the current-carrying conductor to be measured can also be normalized.
  • the very low induced voltage is amplified and processed directly at the site of induction. As a result, the interference immunity to the prior art is significantly increased. Also, there is no opening for calibration to different rated currents, which increases the degree of protection of the measuring arrangement according to the invention.
  • the measuring arrangement according to the invention can advantageously be operated by different sensors. Possible, for example, current measurements through a shunt, Transformer voltage converter or Hall converter.
  • the air coil is a Rogowski coil, which allows high accuracy and linearity in a wide measuring range. If the air coil is a non-closed Rogowski coil, the air coil can be opened and closed again to install the air coil later to a current-carrying conductor.
  • the transmission device has a processor and / or a memory.
  • the processing of the digitally processable signal is carried out according to the invention digitally by a built-in the transmission device programmable processor, as well as the calibration to different rated currents.
  • the processor generates a conditioned signal.
  • the transmission device has a memory in which characteristic values relating to the properties of the coil and / or a function for normalizing the measuring arrangement can be stored.
  • the characteristics also include an error correction, e.g. Offset and temperature.
  • a characteristic field is also possible to account for non-linear influences.
  • This calibration of the measuring arrangement can be normalized to any nominal current of the system to be measured.
  • the memory is part of the processor.
  • the transmission device to a filter device and / or a device for adjusting the signal level, which is adapted to change the output signal of the air coil.
  • the filter device minimizes interference and noise.
  • the amplitude of the input voltage generated by the air coil is determined by the device for adjusting the Signal level changed so that it amplifies the usually generated by the air coil small input voltage.
  • the filter device and / or the device for adjusting the signal level between the air coil and the processor is connected.
  • the transmission device has a device for generating a digitally processable signal from the recorded voltage signal, which is suitable for generating a digitally processable signal from the recorded voltage signal.
  • a digitally processable signal may e.g. into a programmable logic controller (PLC), where the digitally processable signal is available to the user for further applications, e.g. for power or / and energy measurement.
  • PLC programmable logic controller
  • the device for generating a digitally processable signal from the voltage signal between the air coil and the processor is arranged and / or the device for generating a digitally processable signal from the voltage signal is part of the processor itself.
  • the transmission device has a device for generating an output signal which is suitable for generating an output signal from an intermediate value of the transmission device.
  • the output signal can be an impressed output current.
  • the output current may e.g. be directed to a measuring device, where it is available to the user for further use.
  • An impressed current is immune to interference from electrical and magnetic fields. Even with electric fields of 5 kV / m and / or magnetic fields of 200 mT in the immediate vicinity of a transmission device and the Measuring device connecting cable, the output signal in the form of an impressed current only slightly changed so that measurement information can be used without restriction. Unlike a low power voltage, an impressed current is not significantly disturbed even by large magnetic or electric fields. In contrast, an output signal in the form of a voltage can be subjected to massive changes in comparable fields.
  • the device for generating an output signal is arranged behind the output of the processor.
  • the output signal is a binary, modulated or analog signal.
  • the input voltage is converted into a digitally processable signal.
  • a digitally processable signal may e.g. into a programmable logic controller (PLC), where the digitally processable signal is available to the user for further applications, e.g. for power or / and energy measurement.
  • PLC programmable logic controller
  • a return to the processor is mounted behind the output of the device for generating an output signal.
  • the feedback returns the value of the output signal to the processor.
  • the processor is adapted to change the output signal based on the value returned by the feedback to the processor.
  • the feedback to the processor detects the output signal and adjusts the binary, modulated or analog signal output by the processor. By the return is that of the device for generating a Output signal generated output signal checked whether the output signal corresponds to the internally calculated instantaneous value and readjusted if necessary.
  • the transmission device has a device for adjusting the signal level, which is suitable for changing the voltage signal of the air coil.
  • the amplitude of the input voltage generated by the air coil is changed by the device for adjusting the signal level such that it usually amplified by the air coil generated small input voltage.
  • the device for adjusting the signal level between the air coil and the processor is arranged.
  • the transmission device has a control of the device for adjusting the signal level.
  • the control is carried out by the processor.
  • the output signal is susceptible to interference with an electric field with 5 kV / m and / or a magnetic field with 200 mT in the immediate vicinity.
  • Not susceptible to interference in the sense of this patent specification means that the output signal remains substantially unchanged when an electric field of 5 kV / m and / or a magnetic field of 200 mT in the immediate vicinity to a transfer means and the measuring device connecting a transmission means such as a cable acts ,
  • the measuring device is arranged at a distance from the transmission device. This has the advantage that, especially in the presence of large currents and / or voltages or electrical and / or magnetic fields in the vicinity of the air coil, the evaluation unit in the Measuring device unaffected by the existing in the vicinity of the air coil fields remains.
  • the transmission device is connected via a current-conducting cable with the measuring device.
  • the cable can be made flexibly flexible, so that it can be laid during installation in a simple manner.
  • the cable length is in this case to be chosen so large that the measuring device can be arranged with such a large distance from the transmission device that the present in the vicinity of the air coil electrical and / or magnetic field strengths are already significantly attenuated at the position of the measuring device.
  • a cable length or a distance between the measuring device and transmission device of at least 10 cm, preferably at least 20 cm and particularly preferably at least 50 cm is provided.
  • the transmission device is arranged at a small distance from the air-core coil.
  • the distance between the transmission device and the air coil or the length of a conductor arranged between the air coil and the transmission device is less than 10 cm, preferably less than 5 cm and particularly preferably less than 1 cm.
  • the air coil is connected directly to the transmission device without any additional conductor arranged between the air coil and the transmission device. The transmission device is then connected directly to the air coil.
  • the air-core coil has a closure mechanism.
  • Fig. 1 measuring arrangement
  • FIG. 1 shows a measuring arrangement 1 according to the invention for measuring alternating currents with filter device 5, memory 7 integrated in processor 4, feedback 9 and device for adjusting signal level 11 controlled by processor 4.
  • the measuring arrangement 1 has a first structural unit 13 and a second structural unit 14.
  • the first unit 13 has an air coil 2 and is enclosed by an enclosure 15.
  • the second unit 14 has a transmission device 3 and is also enclosed by an enclosure 16.
  • the transmission device 3 has an input connection 18, which is directly galvanically connected to the connection 17 of the air coil 2.
  • the transmission device 3 also has a processor 4.
  • the processor 4 has an input terminal 19 and an output terminal 20.
  • the transmission device 3 is suitable for outputting a signal processed by the processor 4 in the form of an impressed current.
  • the transmission device 3 has a device for generating a digitally processable signal from an analog measurement signal 6.
  • the device for generating a digitally processable signal from an analog measurement signal 6 is connected between the input terminal of the transmission device 18 and the input terminal 19 of the processor 4
  • a filter device 5 is arranged before the device for generating a digitally processable signal from an analog measurement signal 6.
  • the filter device is connected between the input terminal of the transmission device 18 and the input terminal 19 of the processor 4
  • the filter device 5 minimizes interference and noise.
  • the memory 7 is part of the processor 4. In the memory 7 are e.g. Characteristics of the air coil 2 and stored a function for normalization of the measuring device. Furthermore, correction factors are stored in the memory.
  • a device for adjusting the signal level 1 1 is arranged, which adjusts the level of the input voltage generated by the air coil 2.
  • the device for adjusting the signal level 11 is connected between the input terminal of the transmission device 18 and the input terminal 19 of the processor 4.
  • the amplitude of the input voltage generated by the air coil 2 is changed by the device for adjusting the signal level 11 such that it is usually from the air coil 2 amplified small input voltage amplified. From the processed signal, an output signal is generated in the device for generating an output signal 8.
  • the output signal is an impressed output current.
  • the analog measurement signal can be normalized to any measured current and the change in the measurement signal can be corrected by disturbing influences.
  • the impressed output current is fed back through the feedback 9 to the processor 4.
  • the returned impressed output current is measured and adjusted by the processor 4 output binary or analog signal.
  • the impressed output current generated by the device for generating an output signal 8 is checked as to whether the impressed output current is proportional to the current measured in the current-carrying conductor 10 and correspondingly customized.
  • the transmission device 3 has a device for generating an output signal 8, which is connected to the processor output 20.
  • the method for producing a measuring arrangement 1 with an air-core coil 2 has five method steps.
  • the air-core coil 2 is provided.
  • the air coil 2 is assembled and mounted in a housing 15 which is sealed watertight.
  • the air-core coil 2 thus forms a first structural unit 13.
  • the air-core coil 2 has a connection 17, against which an output voltage generated in the air-core coil is applied.
  • the air-core coil 2 is a Rogowski coil which has high accuracy and linearity in a wide measuring range.
  • the air coil 2 can be opened and closed again in order to subsequently install the air coil 2 around a current-carrying conductor 10.
  • a transmission device 3 is provided.
  • the transmission device 3 has an input connection 18 which is suitable for detecting the output voltage of the air coil 2.
  • a processor 4 is arranged, which has a memory 7.
  • a filter device 5 and a device for adjusting the signal level 11 are arranged in the transmission device in such a way that the filter device 5 and the device for adjusting the signal level 11 are connected between the input connection of the transmission device 18 and the input connection 19 of the processor 4.
  • a control of the device for adjusting the signal level 12 is arranged in the transmission device 3, which connects the processor 4 with the device for adjusting the signal level 11.
  • a device for generating a digitally processable signal from an analog measurement signal 6 is arranged in the transmission device such that the device for generating a digitally processable signal from an analog measurement signal 6 between the input terminal of the transmission device 18 and the processor input 19 is connected.
  • the processor output 20 is a device for generating an output signal 8 connected in the form of an impressed current.
  • the output of the device for generating an output signal 8 is connected by the feedback 9 to the processor 4.
  • the transmission device 3 is positioned in an enclosure 15 and thus forms the second structural unit 14.
  • the output 17 of the air coil 2 is electrically connected directly to the input terminal 18 of the transmission device 3.
  • the first unit 13 is thus connected to the second unit 14.
  • the characteristic measured values of the measuring arrangement 1 are detected.
  • the characteristics also include an error correction, e.g. Offset and temperature.
  • a characteristic field is also possible to account for non-linear influences.
  • the measurement tolerance of the measuring arrangement is chosen so that it is particularly preferably less than 0.6% of the rated current.
  • the characteristic values and / or values of the air-core coil 2 derived from the characteristic values are stored in the memory 7.
  • the characteristic values contain the system-specific rated current. From the characteristic values a translation factor is determined.
  • This calibration of the measuring arrangement 1 can in principle be normalized to any nominal current of the system to be measured.
  • the transmission factor is selected so that the impressed output current of the transmission device 3 is 100 mA. If, for example, the rated current of the current-carrying conductor 10 to be measured is at most 37 A, then the ratio factor has a value of 1/370. But it is also possible to measure very low rated currents. For example, if the rated current is 11A, the ratio factor is 1/110.
  • the transmission factor can also be set such that the output current of the transmission device has any other value than 100 mA, eg 1 A. Then the eg. Translation factor has a value of 1/37 at a rated current of the measured current-carrying conductor 10 of 37 A, 1/1 1 at a rated current of the current-carrying conductor 10 to be measured of 1 1 A.
  • an input voltage is induced in the air coil 2 arranged around the current-carrying conductor 10.
  • the filter means 5 unwanted signal components of the input voltage, e.g. Noise and interference, attenuated or suppressed.
  • an impressed output current is generated at the output of a transmission device 3.
  • the input voltage is converted into a digitally processable signal that includes a digital value and / or a frequency value.
  • the characteristics of the air-core coil 2, the translation factor and the error correction are stored. These values are read out of the memory 7 by the processor 4, used by the processor 4 for conversion into an output signal and converted by the processor 4. Usually that is
  • Transmission device 3 is 100 mA. If the rated current of the current-carrying conductor 10 to be measured is at most 37 A, the impressed output current of the measuring arrangement 1 is a maximum of 100 mA, with a lower current intensity of the current-carrying conductor proportionally less, and proportionally more with a higher current intensity of the current-carrying conductor within technical limits.
  • the translation factor here is 1/370.
  • the impressed output current is fed back to the processor 4.
  • the returned impressed output current is measured and adjusted by the processor 4 output binary or analog signal.
  • the impressed output current generated by the device for generating an output signal 8 is checked whether the impressed output current is proportional to the current measured in the current-carrying conductor 10 and adapted accordingly.
  • the impressed output current is passed through the device for generating an output signal 8 output. The output signal can then be processed further.
  • the AC-carrying conductor 10 induces an input voltage into the air coil 2 disposed around the current-carrying conductor 10.
  • the filter means 5 rejects unwanted signal components of the input voltage, e.g. Noise and interference, attenuated or suppressed. Thereafter, an impressed output current is generated at the output of a transmission device 3.
  • the input voltage is converted into a digitally processable signal that includes a digital value and / or a frequency value.
  • the characteristics of the air-core coil 2, the translation factor and the error correction are stored. These values are read out of the memory 7 by the processor 4, used by the processor 4 for conversion into an output signal and processed by the processor 4.
  • the transmission factor is chosen so that the impressed output current of the transmission device 3 is 100 mA. If the rated current of the current-carrying conductor 10 to be measured is at most 87.34 A, and the impressed output current of the measuring arrangement 1 is at most 100 mA, then a ratio factor of 1 / 873.4 is stored in the memory.
  • the value of the output current is fed back to the processor 4.
  • the returned value of the output current is measured and regulated by the processor 4 output binary, modulated or analog signal.
  • the impressed output current generated by the device for generating an output signal 8 is checked as to whether the value of the output current is proportional to the current measured in the current-carrying conductor 10 and adapted accordingly.
  • the impressed output current is output by the device for generating an output signal 8. The digitally processable signal can then be further processed.
  • the AC-carrying conductor 10 induces an input voltage in order to Through the filter device 5 unwanted signal components of the input voltage, such as noise and interference are attenuated or suppressed. Thereafter, an impressed output current is generated at the output of a transmission device 3.
  • the input voltage is converted into a digitally processable signal that includes a digital value and / or a frequency value.
  • the characteristics of the air-core coil 2, the translation factor and the error correction are stored. These values are read out of the memory 7 by the processor 4, used by the processor 4 for conversion into an output signal and converted by the processor 4.
  • the transmission factor is selected so that the impressed output current of the transmission device 3 1 A.
  • the rated current of the current-carrying conductor 10 to be measured is at most 105 A, then a ratio factor of 1/105 is stored in the memory 7 of the transmission device 3. Through the feedback 9, the impressed output current is fed back to the processor 4. In processor 4, the feedback is impressed
  • Measured output current and adjusted by the processor 4 output binary or analog signal.
  • the impressed output current generated by the device for generating an output signal 8 is checked whether the impressed output current is proportional to the current measured in the current-carrying conductor 10 and adapted accordingly.
  • the impressed output current is output by the device for generating an output signal 8.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un ensemble de mesure comprenant une bobine à air, comprenant les étapes consistant à : fournir la bobine à air, la bobine à air ayant une borne à laquelle une tension de sortie générée dans la bobine à air est appliquée ; détecter des valeurs caractéristiques d'une bobine à air ; fournir un dispositif de transmission, le dispositif de transmission ayant une borne d'entrée qui est appropriée à detecter la tension de sortie de la bobine à air; agencer une mémoire dans le moyen de transfert; mémoriser des valeurs caractéristiques et/ou des valeurs dérivées des valeurs caractéristiques dans la mémoire; mémoriser une fonction dans la mémoire, agencer un processeur dans le moyen de transfert et raccorder de manière directe la sortie de la bobine à air à la borne d'entrée du moyen de transfert. L'invention concerne également un dispositif de mesure produit par ce procédé.
PCT/EP2019/060506 2018-04-24 2019-04-24 Procédé de fabrication d'un dispositif de mesure de courants alternatifs comprenant une bobine à air Ceased WO2019206993A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018109878.2 2018-04-24
DE102018109878.2A DE102018109878A1 (de) 2018-04-24 2018-04-24 Verfahren zur Herstellung einer Luftspule

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WO2019206993A1 true WO2019206993A1 (fr) 2019-10-31

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