WO2017129807A1 - Procédé et système pour mesurer un courant primaire traversant une ligne de transmission - Google Patents

Procédé et système pour mesurer un courant primaire traversant une ligne de transmission Download PDF

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Publication number
WO2017129807A1
WO2017129807A1 PCT/EP2017/051880 EP2017051880W WO2017129807A1 WO 2017129807 A1 WO2017129807 A1 WO 2017129807A1 EP 2017051880 W EP2017051880 W EP 2017051880W WO 2017129807 A1 WO2017129807 A1 WO 2017129807A1
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WO
WIPO (PCT)
Prior art keywords
signal
reference current
fed
transmission line
ift
Prior art date
Application number
PCT/EP2017/051880
Other languages
English (en)
Inventor
Joris PASCAL
Martin ZLATANSKI
Original Assignee
Abb Schweiz Ag
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 Abb Schweiz Ag filed Critical Abb Schweiz Ag
Publication of WO2017129807A1 publication Critical patent/WO2017129807A1/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
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • 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
    • G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
    • 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
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/205—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using magneto-resistance devices, e.g. field plates

Definitions

  • the present invention relates to current measurement based on magnetic field sensors. Furthermore, the present invention relates to adapting a current measurement system including a magnetic field sensor to correct errors.
  • magnetic field sensors are used which are located close at a power transmission line through which the primary current to be measured flows so that a magnetic field caused by the primary current can be measured and evaluated.
  • Magnetoresistive sensors can be used. Magnetoresistive sensors may include a GMR (giant magnetoresistance) sensor or the like and allow measuring of both DC and AC currents. Magnetoresistive sensors can be provided without any hysteresis, since no iron core is required which is conventionally used in other type of current measurement systems. Due to this advantage, magnetoresistive sensors can provide a high sensitivity (i.e. good detection level also for small signals) and a very high dynamic range, which facilitates detecting residual current or earth fault currents. Particularly, at high-frequency currents, the high sensitivity enables detecting control signals transmitted over the transmission line. Furthermore, transient events and harmonics present in the transmission line can be measured due to the high bandwidth of magnetoresistive sensors.
  • GMR giant magnetoresistance
  • magnetoresistive sensors exhibit pure accuracy due to a high temperature dependency and high manufacturing tolerances. Gain error, aging error and temperature error can be significant. It is therefore an object of the present invention to provide a method for measuring currents flowing in a transmission line using a magnetoresistive sensor with an increased accuracy.
  • This object has been achieved by the method for measuring a primary current in a transmission line using a magnetic field sensor device according to claim 1 and by a current measurement system according to the further independent claim.
  • a method for measuring a primary current through a transmission line by means of a magnetic field sensor device comprising the steps of:
  • reference signal means reference current signal
  • fed-through reference signal means fed-through reference current signal
  • injected reference signal means injected reference current signal.
  • fed-through reference current signal signifies that portion of the injected reference current signal, which is flowing through the portion of the transmission line associated with the magnetic-field sensor device.
  • One idea of above method is to inject a reference signal into the transmission line, so that a corresponding reference current is caused to flow through the sensed portion of the transmission line which is magnetically coupled / associated with a magnetic field sensor device.
  • the reference signal has a known amplitude and frequency, wherein the frequency is substantially higher than the frequencies of the primary current on the transmission line.
  • the magnetic field sensor device provides a sensor signal (e.g. as a sensor voltage) related to the current flowing through the sensed portion of the transmission line.
  • a sensor signal e.g. as a sensor voltage
  • the reference current fed-through the sensed portion of the transmission line is received from the transmission line and compared with a corresponding reference current sensor signal portion.
  • the reference current sensor signal portion corresponds to the signal portion of the sensor signal caused by the fed-through reference current.
  • the reference current has a reference frequency which is not represented in the primary current.
  • a comparison between the fed-through reference current and the corresponding current reference sensor signal portion results in a correction signal which can be applied onto the sensor signal obtained by the magnetic field sensor device so that a current measurement signal is obtained.
  • the obtained correction signal may be applied for a correction of the sensor signal for the primary current.
  • the fed-through reference signal may be obtained by means of a coupling unit including a band-pass filter characteristic.
  • the fed-through reference signal may be amplified before applied to comparison. It can be provided that the fed-through reference signal is obtained by means of a coupling unit including a band-pass filter characteristic.
  • the correction signal may be obtained as a difference or relation between the fed-through reference signal and the extracted sensor signal portion.
  • the injected reference signal and/or the fed-through reference signal may be blocked from propagating into other portions of the transmission line.
  • the injected reference signal may be a sinusoidal AC signal having a frequency which is higher than frequencies in the primary current through the transmission line.
  • a current measurement system for measuring a primary current in a transmission line comprising:
  • a magnetic field sensor device to provide a sensor signal depending on a magnetic field caused by the primary current flowing through the transmission line
  • a reference signal source for providing a reference signal to be injected through a portion of the transmission line associated with the sensor device
  • the current measurement system further comprises:
  • the correction unit for obtaining a measurement signal depending on the sensor signal and on the correction signal.
  • the means for receiving a fed-through reference signal may include a band-pass filter.
  • At least one terminal of the sensor device may be coupled with a choke to block the injected reference signal to propagate to another portion of the transmission line.
  • an amplifier may be provided to amplify the fed-though signal before applying to the comparator.
  • the means for receiving the fed-through reference signal may comprise a coupling unit, particularly formed as a band-pass filter with a pass-through frequency corresponding to the frequency of the reference signal.
  • Figure 1 shows a schematic diagram of a current measurement system
  • Figure 2 shows a schematic diagram of a further current measurement system. Description of embodiments
  • Figure 1 shows a current measurement system 1 configured to measure a primary current l p in an electrical power transmission line 2 which may be a transmission line for carrying and conveying medium or high voltage electrical power.
  • an electrical power transmission line 2 which may be a transmission line for carrying and conveying medium or high voltage electrical power.
  • a sensor device 3 is applied on a sensing portion of the transmission line 2.
  • the sensor device 3 is galvanically isolated from the transmission line 2 and configured as a magnetic field detecting device.
  • the sensor device 3 can be formed with one or more magnetoresistive sensors placed close to the sensing portion of the transmission line 2 to detect a magnetic field caused by a primary current l p flowing through the transmission line 2 and providing a sensor signal (SS) related thereof.
  • SS sensor signal
  • Magnetic field sensor devices 3 may include a plurality of magnetoresistive sensors in a bridge circuit to improve the sensitivity of the sensor device 3. Configurations of the magnetic field sensor device 3 are well known in the art and therefore not described herein in more detail. Magnetic field sensor devices can be obtained as standard devices, such as Sensitec CMS3100 or the like.
  • the transmission line 2 provides a first and a second line impedance which is indicated as Zi for a first portion 2a of the transmission line 2 which is on one side of the sensing portion of the transmission line 2 and Z2 for a second portion 2b of the transmission line 2 which is on another side of the sensing portion of the transmission line 2, respectively.
  • a reference signal is provided. For instance a voltage signal can be generated as a reference which is coupled so that a reference signal ⁇ n ⁇ as a reference current is injected on a first terminal Ti of the sensor device 3.
  • the first terminal Ti is located between the first portion 2a and the sensing portion of the transmission line 2.
  • the injected reference signal flows through the sensed portion of the transmission line 2 and is tapped/received from a second terminal T2 of the sensor device 3 as the fed- through reference signal Ift.
  • the second terminal T2 is located between the second portion 2b and the sensing portion of the transmission line 2.
  • the reference signal may be provided by a reference signal source 4 which provides an AC voltage signal, preferably a sinusoidal AC voltage signal of a reference amplitude and a reference frequency which should be selected to be substantially higher than the frequency of the primary current l p to be measured.
  • the frequency of the voltage signal can be in a range of 1 to 10 MHz, particularly 2MHz.
  • the reference signal source 4 is may be coupled via a first coupling unit 5 with the first terminal Ti of the sensor device 3.
  • the first coupling unit 5 may be formed as a passive filter with a band-pass characteristic which allows only the reference signal to be forwarded to the first terminal Ti, while due to the band-pass characteristic it is prevented any other frequency portion of the primary current l p to flow through the reference signal source 4.
  • the reference frequency is selected as a frequency which is not present in the primary current l p so as to allow a clear separation of the reference signal form any AC portions included in the primary current l p .
  • the first coupling unit 5 may comprise a series L-C resonant circuit with a first inductance L1 and a first capacitance C1 and provides a very low impedance at the selected frequency of the reference signal.
  • Other configurations for the band-pass filter which provide a low impedance for the reference signal can be applied as well.
  • the fed-through reference signal Ift is tapped/received by means of a second coupling unit 6.
  • the second coupling unit 6 may comprise an L-C resonant circuit with a second inductance L2 and a second capacitance C2 and provides a very low impedance at the selected frequency of the reference signal.
  • the second coupling unit 6 may forward the filtered fed-through reference current signal to a current amplifier 7 to amplify the amplitude of the obtained fed-through reference signal which is a current signal.
  • the amplifier gain may be preselected and calibrated in an initial calibration process.
  • the coupling units 5, 6 shall present a very high impedance at the frequencies of the primary current to be measured.
  • the reference signal source 4 and the current amplifier 7 are completely decoupled from the primary current signal to be measured.
  • the sensor signal SS provided by the sensor device 3 is bandpass-filtered by a filtering means 8 with a pass-through frequency corresponding to the frequency of the reference signal.
  • the bandpass-filtering can be performed e.g. by means of a Fourier transformation to obtain a sensor signal portion at the frequency of the reference signal.
  • Other options for bandpass-filtering such as by means of a passive or active band-pass filter can also be applied.
  • the filtered sensor signal FSS at the output of the filtering means 8 and the amplified fed-through reference signal are applied to a comparator 1 1 which provides a correction signal SC as a difference or a relation between the filtered sensor signal FSS and the amplified fed-through reference signal FAS.
  • the correction signal SC is applied on the sensor signal SS in a correction unit 10 which can be configured as a multiplier, an adder or the like to obtain a measurement signal Smeas which corresponds to the corrected sensor signal.
  • the sensor signal SS applied to the correction unit 10 might be unfiltered or filtered so that only the sensor signal portion related to the primary current is applied to the correction unit 10. Directly applying the sensor signal SS to the correction unit 10 is possible as long as the sensor signal portion which results from the injected reference current is neglectable.
  • the sensor signal can be filtered in a low-pass filter 9, if the reference signal portion through the sensor device 3 is not neglectable with respect to the primary current portion.
  • This current measurement system 1 makes use of the high dynamic range and large bandwidth of the magnetoresistive current sensors, as the sensor device 3 is capable to catch up both the primary current l p and the fed-through reference signal lit.
  • the filtered signal portion FSS of the sensor signal SS measured by the sensor device and extracted by the filtering means 8 is compared to the amplified fed-through reference signal FAS provided by the amplifier 7.
  • the resulting correction signal SC may represent a drift of the sensor device 3 and can be used to correct the measured sensor signal SS related to the primary current l p .
  • a first choke 12 having a first choke inductance Uhokei is applied at or close the first terminal Ti of the sensor device 3, i.e. in the first portion 2a of the transmission line 2.
  • the first choke 12 is required, if the first impedance Zi of the first portion 2a of the transmission line 2 is low compared to the impedance seen when looking into the first terminal Ti, not known and/or not constant.
  • the first choke inductance Uhokei of the first choke 12 is selected to provide a high impedance at the frequency of the injected reference signal linj. This is to assure that a signal portion of the injected reference signal linj flows through the sensing portion of the transmission line 2.
  • a third capacitor C3 can be connected in parallel to the first choke to provide a parallel resonant circuit to improve the filtering effect for the frequency of the reference signal.
  • the second choke 13 may be connected at or close to the second terminal T2 of the sensor device 3, particularly if the second impedance Z2 is low compared to the impedance seen when looking into the second terminal T2, not known and/or not constant.
  • Second choke impedance L C hoke2 of the second choke 13 provides high impedance at the frequency of the reference signal. This is to avoid that a signal portion of the fed- through reference signal flows through the second portion 2b of the transmission line 2 and can therefore not be received by the second coupling unit 6.
  • the first and second chokes 12, 13 therefore serve to guide the injected reference signal ⁇ n ⁇ from the reference signal source 4 to the amplifier 7 without that any or significant signal portions of the reference signal might get lost through the first and second portions 2a, 2b of the transmission line 2, respectively.
  • the chokes 12, 13 it can be ensured that the ratio of injected reference current to the received fed-through reference signal Ift remains constant when the impedances on/in the transmission line 2 change.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un procédé et un système correspondant (1) pour mesurer un courant primaire (I p) traversant une ligne de transmission (2) au moyen d'un dispositif capteur de champ magnétique (3), comprenant les étapes consistant : - à injecter un signal de référence à travers une partie de la ligne de transmission (2) associée au dispositif capteur (3) ; - à recevoir un signal de référence d'alimentation traversant (In) ; - à extraire une partie de signal de capteur provenant d'un signal de capteur obtenu, la partie de signal de capteur résultant du signal de référence injecté (hn j ) traversant le dispositif capteur de champ magnétique (3) ; - à fournir un signal de mesure (S meas ) dépendant du signal de capteur (SS) et basé sur le signal de référence d'alimentation traversant (In) et sur la partie de signal de capteur extraite.
PCT/EP2017/051880 2016-01-29 2017-01-30 Procédé et système pour mesurer un courant primaire traversant une ligne de transmission WO2017129807A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16153405 2016-01-29
EP16153405.2 2016-01-29

Publications (1)

Publication Number Publication Date
WO2017129807A1 true WO2017129807A1 (fr) 2017-08-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3627159A1 (fr) * 2018-09-21 2020-03-25 Analog Devices Global Unlimited Company Appareil et procédé de suppression de signal de perturbation à partir d'un flux de données en série et appareil de mesure et/ou de protection comprenant un tel appareil de suppression de signal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120001617A1 (en) * 2010-07-02 2012-01-05 Reynolds Brett S Apparatus for calibrated non-invasive measurement of electrical current
US20150054500A1 (en) * 2012-04-06 2015-02-26 Commissariat à I'énergie atomique et aux énergies alternatives Method and device for measuring a magnetic field and the temperature of a magneto-resistive transducer
WO2015051983A1 (fr) * 2013-10-09 2015-04-16 Abb Research Ltd Dispositif de mesure de courant et procédé utilisant un transducteur de courant de type rogowski

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120001617A1 (en) * 2010-07-02 2012-01-05 Reynolds Brett S Apparatus for calibrated non-invasive measurement of electrical current
US20150054500A1 (en) * 2012-04-06 2015-02-26 Commissariat à I'énergie atomique et aux énergies alternatives Method and device for measuring a magnetic field and the temperature of a magneto-resistive transducer
WO2015051983A1 (fr) * 2013-10-09 2015-04-16 Abb Research Ltd Dispositif de mesure de courant et procédé utilisant un transducteur de courant de type rogowski

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3627159A1 (fr) * 2018-09-21 2020-03-25 Analog Devices Global Unlimited Company Appareil et procédé de suppression de signal de perturbation à partir d'un flux de données en série et appareil de mesure et/ou de protection comprenant un tel appareil de suppression de signal
US11474131B2 (en) 2018-09-21 2022-10-18 Analog Devices International Unlimited Company Removing perturbation signal from a serial data stream, and to measurement and/or protection apparatus including same

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