WO2019206992A1 - Système de mesure de courants alternatifs avec une bobine sans fer - Google Patents

Système de mesure de courants alternatifs avec une bobine sans fer Download PDF

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Publication number
WO2019206992A1
WO2019206992A1 PCT/EP2019/060505 EP2019060505W WO2019206992A1 WO 2019206992 A1 WO2019206992 A1 WO 2019206992A1 EP 2019060505 W EP2019060505 W EP 2019060505W WO 2019206992 A1 WO2019206992 A1 WO 2019206992A1
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WO
WIPO (PCT)
Prior art keywords
signal
measuring
processor
alternating currents
transmission device
Prior art date
Application number
PCT/EP2019/060505
Other languages
German (de)
English (en)
Inventor
Bernd Wittig
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 WO2019206992A1 publication Critical patent/WO2019206992A1/fr

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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

Definitions

  • the invention relates to a measuring arrangement for measuring time-varying electrical currents (hereinafter alternating currents) with a first unit, wherein the first unit comprises an air coil, with a second unit, wherein the second unit has a transmission device with a memory.
  • the second module is also suitable to receive a measurement signal of the first unit using the processed data stored in the memory and to produce a modified output signal.
  • Various methods are used in industry and the household to measure currents of AC-carrying conductors.
  • 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, especially at low currents of the conductor through which the AC flows are so small that they have to 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 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 measuring arrangement according to the invention for measuring alternating currents has a first structural unit and a second structural unit.
  • the first unit has an air coil.
  • the second unit is adapted to receive a voltage signal of the first unit.
  • the second unit has a transmission device and a memory.
  • the second module is suitable for generating a processed signal and / or an output signal in the form of an impressed current using data stored in the memory.
  • the second unit can be mounted spatially separated from the first unit. Particularly dirt-intensive or damp Environments which can affect the function of the electronics of the second unit can thus be avoided.
  • the current flow through the conductor to be measured induces in the air coil a voltage which is proportional to the rate of change of the current.
  • a voltage which is proportional to the rate of change of the current.
  • proportional phase correct and amplitude proportional This induced voltage is so low (a few pV up to a few hundred mV) that it usually has to be boosted.
  • the output measured value is usually given with reference to the nominal current and the nominal frequency, e.g. 100 mV per 1000 A at 50Hz.
  • the processing is carried out according to the invention digitally by a built-in the transmission device programmable processor, as well as the calibration to different currents to be measured.
  • any small current of the current-carrying conductor to be measured can be normalized.
  • 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 calibration is essentially independent of the length of the air coil, which allows optimization or minimization of the coil diameter, based on the current-carrying conductor and a resulting reduction in the position error.
  • digital signal processing is particularly stable in terms of aging and offset drift.
  • the measuring arrangement according to the invention can advantageously have different measuring devices.
  • the transmission device according to the invention is also suitable for a shunt, a transformer voltage transformer or to be connected to a Hall converter.
  • the term air coil is therefore used in the context of this patent as a synonym for these measuring devices.
  • the air coil has high linearity in a wide dynamic range and thus achieves high accuracy.
  • the air coil may be a closed coil or have an opening mechanism to install the air coil later to a current-carrying conductor.
  • the first assembly is arranged in a first enclosure.
  • the components of the first unit are protected by the housing against contamination, as they may occur during operation of the measuring arrangement.
  • the first unit can thus also be installed in environments that require increased protection for electrical installations.
  • the second structural unit is arranged in a second enclosure.
  • the components of the second unit are protected by the housing against contamination, as they can occur during operation of the measuring arrangement.
  • the second assembly can thus also be installed in environments that require increased protection for electrical installations.
  • the transmission device is designed such that it can receive a measurement signal of the air coil.
  • the transmission device has a processor.
  • the transmission device is suitable for generating a signal conditioned by the processor.
  • the transmission device has a filter device which is suitable for changing the measurement signal of the coil. In particular, the filter device minimizes interference and noise.
  • the filter device is arranged between the air-core coil and the processor. In this way it is prevented that noise or interferences adulterate the measured current intensity of the conductor through which current flows.
  • 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 processed signal may e.g. into a programmable logic controller (PLC), where the digitally-processed signal is available to the user for other applications, e.g. for power or / and energy measurement.
  • PLC programmable logic controller
  • the device for generating a digitally processable signal from the measurement signal between the air coil and the processor is arranged and / or the device for generating a digitally processable signal from the measurement signal is part of the processor itself.
  • the transmission device has a memory in which the characteristic values relating to the properties of the coil can be stored.
  • the memory is part of the processor.
  • 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 can be routed, for example, to a measuring device, where it is available to the user for further applications.
  • the device for generating an output signal is arranged behind the output of the processor.
  • the signal prepared by the processor is a binary, modulated or analog signal.
  • 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.
  • the output signal generated by the device for generating an output signal is checked whether the output signal corresponds to the internally calculated instantaneous value and adjusted if necessary.
  • the transmission device has a device for adjusting the signal level which is suitable for changing the voltage signal of the air-core coil.
  • 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 housing of the second unit encloses the processor, the filter device, the device for generating a digitally processable signal from an analog measurement signal, the device for generating an output signal, the feedback, the device for adjusting the signal level and / or the control of the device for adjusting the signal level.
  • the housing of the second structural unit is suitable for preventing the penetration of foreign bodies having a diameter of> 1.0 mm into the second structural unit.
  • the second unit is thus also used in particularly dirt and dusty areas.
  • the housing of the second structural unit is suitable for preventing direct contact with the components located in the housing of the second structural unit and / or penetration with a wire.
  • both the operation of the second unit is given under adverse conditions, and eliminates the risk of injury to a user.
  • the enclosure of the second unit is suitable to prevent the ingress of water into the second unit when spraying on all sides.
  • the second structural unit can be installed by this advantageous embodiment of the invention in wet and / or wet environments. The function of the second unit is still ensured.
  • the housing of the second unit can be closed.
  • the housing is permanently closed.
  • permanent closure means that the housing can not be reopened without at least parts of the housing or the enclosure being destroyed altogether or at least plastically deformed.
  • the connection is cohesive. This connection is made for example by welding, gluing or dissolving the housing parts to be joined. This has the advantage that the components in the enclosure are also protected against manipulation.
  • 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 connecting means and the measuring device connecting a transmission means such as a cable acts ,
  • the transmission device is suitable for outputting an output signal as an impressed current.
  • the output signal is sent to the measuring device, which processes the output signal.
  • 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 cable connecting the transmission device and the measuring device, the output signal in the form of an impressed current is changed only slightly 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 measuring device is arranged at a distance from the transmission device. This has the advantage that, in particular 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 remains unaffected by the fields present in the vicinity of the air coil.
  • 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. This has the advantage that the measuring arrangement according to the invention for measuring currents and voltages can also be used retroactively in already installed and in operation electrical installations, without having to solve already existing conductor connections again.
  • Fig. 1 inventive measuring arrangement for the measurement of alternating currents
  • Fig. 2 inventive measuring arrangement for measuring alternating currents
  • Filter device device for generating a digitally processable signal from an analog measurement signal separate from the processor
  • Fig. 3 inventive measuring arrangement for the measurement of alternating currents
  • Filter device device for generating a digitally processable signal from an analog measurement signal as part of the processor
  • Fig. 4 inventive measuring arrangement for the measurement of alternating currents
  • Filter device device for generating a digitally processable signal from an analog measurement signal as part of the processor, with memory Fig. 5 Measuring device according to the invention for measuring alternating currents with
  • Filter device integrated memory and feedback in the processor.
  • Fig. 6 inventive measuring arrangement for measuring alternating currents
  • FIG. 7 shows a measuring arrangement according to the invention for measuring alternating currents with filter device and device controlled by the processor for adjusting the signal level
  • the measuring arrangement 1 shows the measuring arrangement according to the invention for measuring alternating currents 1 of a conductor 10 through which the current flows.
  • the measuring arrangement 1 has a first structural unit 13 and a second unit 14 on.
  • the first unit 13 has an air-core coil 2.
  • the second unit 14 has a transmission device 3.
  • the first unit 13 is directly connected to the second unit 14. On an interposed cable was omitted.
  • the transmission device 3 has a processor 4 with an integrated memory 7.
  • the transmission device 3 is suitable for generating a signal processed by the processor 4.
  • 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 part of the processor 4.
  • the transmission device 3 has a device for generating an output signal 8.
  • the output signal in the form of an impressed current is usually given in relation to the current in the current-carrying conductor 10 and is proportional to this, e.g. 100 mA at 1000 A measured current.
  • an input voltage is induced in the air coil 2 arranged around the current-carrying conductor 10. 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 digitally processable signal may then be e.g. fed to a PLC (Programmable Logic Controller) and e.g. stored, used for power or / and energy measurement.
  • PLC Programmable Logic Controller
  • FIG. 2 An inventive measuring arrangement 1 for measuring alternating currents with filter device 5 is shown in FIG. 2.
  • 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 are connected by a 3 cm long cable-shaped cable.
  • the second unit 14 has a transmission device 3 and is also enclosed by a housing 16.
  • the transmission device 3 has a processor 4.
  • An external memory 7 is connected to the processor.
  • the transmission device 3 is suitable for outputting a signal processed by the processor 4.
  • the transmission device 3 has a device for generating a digitally processable signal from an analog measurement signal 6.
  • a filter device 5 is arranged before the device for generating a digitally processable signal from an analog measurement signal 6, a filter device 5 minimizes interference and noise. In this way it is prevented that noise or interfering radiation falsify the measured current strengths of the current-carrying conductor 10.
  • the transmission device 3 has a device for generating an impressed output signal 8.
  • the output current is usually given in relation to the current in the current-carrying conductor 10 and is proportional to this, for example, 100 mA at 1000 A measured current.
  • 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 digitally processable signal can then be further processed.
  • the measuring arrangement 1 has a first structural unit 13 and a second structural unit 14.
  • the first unit 13 has an air-core coil 2 and is provided by an enclosure 15 enclosed.
  • the first unit 13 and the second unit 14 are connected to each other via a 6 cm long conductor in the form of a cable or a line.
  • the second unit 14 has a transmission device 3 and is also enclosed by an enclosure 16.
  • the transmission device 3 has a processor 4 with an integrated memory 7.
  • the transmission device 3 is suitable for outputting a signal processed by the processor 4.
  • 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 part 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 5 minimizes interference and noise. In this way it is prevented that noise or interfering radiation falsify the measured current strengths of the current-carrying conductor 10.
  • the transmission device 3 has a device for generating an output signal 8 in the form of an impressed current.
  • the impressed output current is usually given in relation to the current in the current-carrying conductor 10 and is proportional to this, for example, 100 mA at 1000 A measured current.
  • a measuring arrangement 1 for measuring alternating currents with filter device 5 and memory 7 integrated into the processor 4 is shown in FIG. 4.
  • the measuring arrangement 1 has a first structural unit 13 and a second structural unit 14 connected directly to the structural unit 13.
  • 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 housings 15, 16 of the first and second structural units 13, 14 directly adjoin one another.
  • the transmission device 3 has a processor 4.
  • the transmission device 3 is suitable for outputting a signal processed by the processor 4.
  • the transmission device 3 has a device for generating a digitally processable signal from an analog measurement signal 6.
  • a filter device 5 is arranged before the device for generating a digitally processable signal from an analog measurement signal 6, a filter device 5 is arranged.
  • the filter device 5 minimizes interference and noise.
  • the memory 7 is designed as external memory. For example, characteristic values of the air-core coil 2 and the transmission device 3 can be stored in the memory 7.
  • the analog measurement signal can be normalized to any measured current, eg, a measured current of 32 A can correspond to a measurement signal of 100 mA, which is output by the device for generating an output signal 8.
  • an input voltage is induced in the air coil 2 arranged around the current-carrying conductor 10.
  • the filter device 5 unwanted signal components of the input voltage, such as 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 having a digital value and / or a digital value Frequency value includes.
  • characteristic values of the air-core coil 2 and the transmission device 3 are stored in the memory 7. These characteristics 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. In this way, the output signal can be normalized to any measured current output by the device 8 for generating an output signal 8 in the form of an impressed current.
  • Measuring arrangement 1 has a first structural unit 13 and a second structural unit 14 arranged adjacent to first structural unit 13.
  • 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 a processor 4 with an integrated memory 7.
  • memory 7 e.g. Characteristics of the air coil 2 and the transmission device 3 may be stored. These characteristics are read out of the memory 7 by the processor 4, used by the processor 4 for conversion into an output signal in the form of an impressed current and processed by the processor 4.
  • the transmission device 3 is suitable for outputting a signal processed by the processor 4.
  • the transmission device 3 has a device for generating a digitally processable signal from an analog measurement signal 6.
  • a filter device 5 is arranged before the device for generating a digitally processable signal from an analog measurement signal 6.
  • the filter device 5 minimizes interference and noise.
  • the memory 7 is part of the processor 4. In the memory 7, for example, characteristic values of the air coil 2 and the transmission device 3 can be stored. These characteristics are read out of the memory 7 by the processor 4, by the processor 4 for conversion into Used output signal and processed by the processor 4.
  • the output signal is an output current. In this way, the impressed output current can be normalized to any measured current.
  • a signal is fed back to the processor 4 as the value of the output current.
  • the returned output current is evaluated and adjusted by the processor 4 output binary, modulated or analog signal.
  • the value of the 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 adjusted accordingly, eg 100 mA at 1000 A measured current.
  • an input voltage is induced in the air coil 2 arranged around the current-carrying conductor 10.
  • the filter device 5 unwanted signal components of the input voltage, such as 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.
  • characteristic values of the air-core coil 2 and the transmission device 3 are stored in the memory 7. These characteristics are read out of the memory 7 by the processor 4, used by the processor 4 for conversion into an output signal in the form of an impressed current and converted by the processor 4.
  • FIG. 6 shows a measuring arrangement 1 according to the invention for measuring alternating currents with filter device 5 and device for adjusting the signal level 11.
  • the measuring arrangement 1 has a first structural unit 13 and a second structural unit 14 arranged adjacent to the first structural unit 13.
  • 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 a processor 4 which is connected to an external memory 7. For example, characteristic values of the air-core coil 2 and the transmission device 3 can be stored in the memory 7. These characteristics are read out of the memory 7 by the processor 4, used by the processor 4 for conversion into an output signal in the form of an impressed current and processed by the processor 4.
  • the transmission device 3 is suitable for outputting a signal processed by the processor 4.
  • the transmission device 3 has a device for generating a digitally processable signal from an analog measurement signal 6.
  • a filter device 5 is arranged before the device for generating a digitally processable signal from an analog measurement signal 6.
  • the filter device 5 minimizes interference and noise.
  • a device for adjusting the signal level 11 is arranged, which adjusts the level of the input voltage generated by the air coil 2.
  • the amplitude of the input voltage generated by the air coil 2 is changed by the device for adjusting the signal level 1 1 such that it amplifies the low input voltage usually generated by the air coil 2.
  • an input voltage is induced in the air coil 2 arranged around the current-carrying conductor 10.
  • the filter device 5 unwanted signal components of the input voltage, such as noise and interference, attenuated or suppressed.
  • 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 amplitude of the input voltage generated by the air coil 2 is changed by the device for adjusting the signal level 1 1 such that it amplifies the input voltage usually generated by the air coil 2. 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 digitally processable signal can then be further processed.
  • a measuring arrangement 1 according to the invention for measuring alternating currents with filter device 5 and apparatus for adjusting the signal level 11 controlled by the processor 4 is shown in FIG. 7.
  • the measuring arrangement 1 has a first structural unit 13 and a second structural unit 14 directly adjacent to the first structural unit 13.
  • 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 a processor 4 which is connected to an external memory 7.
  • characteristic values of the air-core coil 2 and the transmission device 3 can be stored in the memory 7. These characteristics are read out of the memory 7 by the processor 4, by the Processor 4 is used for conversion into an output signal in the form of an impressed current and processed by the processor 4.
  • the transmission device 3 is suitable for outputting a signal processed by the processor 4.
  • the transmission device 3 has a device for generating a digitally processable signal from an analog measurement signal 6.
  • a filter device 5 is arranged before the device for generating a digitally processable signal from an analog measurement signal 6.
  • the filter device 5 minimizes interference and noise.
  • a device for adjusting the signal level 11 is arranged, which adjusts the level of the input voltage generated by the air coil 2.
  • the device for adjusting the signal level 1 1 is controlled by the control of the device for adjusting the signal level 12.
  • the amplitude of the input voltage generated by the air coil 2 is changed by the device for adjusting the signal level 1 1 such that it amplifies the input voltage usually generated by the air coil 2.
  • the transmission device 3 has a device for generating an output signal 8 in the form of an impressed current.
  • an input voltage is induced in the air coil 2 arranged around the current-carrying conductor 10.
  • the filter device 5 unwanted signal components of the input voltage, such as noise and interference, attenuated or suppressed.
  • a device for adjusting the signal level 11 is arranged, which adjusts the level of the input voltage generated by the air coil 2.
  • the device for adjusting the signal level 1 1 is controlled by the device for adjusting the signal level 12.
  • the amplitude of the input voltage generated by the air coil 2 is determined by the Device for adjusting the signal level 1 1 changed so that it amplifies the input voltage usually generated by the air coil 2.
  • 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 digitally processable signal can then be further processed.

Abstract

L'invention concerne des systèmes de mesure pour la mesure de courants alternatifs pourvus d'un premier élément, le premier élément comportant une bobine sans fer, d'un deuxième élément, le deuxième ensemble comportant un équipement de transmission pourvu d'une mémoire. Le deuxième élément sert en outre à recevoir un signal de mesure du premier élément et à produire un signal traité au moyen de données enregistrées dans la mémoire.
PCT/EP2019/060505 2018-04-24 2019-04-24 Système de mesure de courants alternatifs avec une bobine sans fer WO2019206992A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018109877.4 2018-04-24
DE102018109877.4A DE102018109877A1 (de) 2018-04-24 2018-04-24 Luftspule

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WO2019206992A1 true WO2019206992A1 (fr) 2019-10-31

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