WO2020049883A1 - Appareil de mesure de courant électrique et procédé de mesure de courant électrique - Google Patents

Appareil de mesure de courant électrique et procédé de mesure de courant électrique Download PDF

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Publication number
WO2020049883A1
WO2020049883A1 PCT/JP2019/028910 JP2019028910W WO2020049883A1 WO 2020049883 A1 WO2020049883 A1 WO 2020049883A1 JP 2019028910 W JP2019028910 W JP 2019028910W WO 2020049883 A1 WO2020049883 A1 WO 2020049883A1
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WO
WIPO (PCT)
Prior art keywords
measured
sensor
conductor
current
electric wire
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Application number
PCT/JP2019/028910
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English (en)
Japanese (ja)
Inventor
哲也 吉池
池田　正和
謙太郎 中島
Original Assignee
日置電機株式会社
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Application filed by 日置電機株式会社 filed Critical 日置電機株式会社
Publication of WO2020049883A1 publication Critical patent/WO2020049883A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • 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
    • 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
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Definitions

  • the present invention relates to a current measuring device and a current measuring method.
  • a clamp meter is used to measure the current of an electric wire to be measured in a live state.
  • a clamp sensor which is a current sensor, is attached to an electric wire to be measured, and the current of the electric wire to be measured is measured.
  • Some clamp sensors include a magnetic core that forms a closed magnetic path arranged in a ring around the electric wire to be measured, and a magnetic sensor including a Hall element and a detection coil that detect the magnetism of the magnetic core.
  • a cable type flexible current sensor There is also a cable type flexible current sensor.
  • the first proposal is a measuring device provided with a terminal capable of contacting a coating of a wire to be measured, the terminal having a magnetic sensor for detecting a magnetic field generated by a current flowing through the wire to be measured, and a magnetic field detected by the magnetic sensor. And, provided an operating unit that can input or select the standard information of the measurement target wire, based on the information of the thickness of the coating of the measurement target wire and the thickness of the conductor determined by the standard of the measurement target wire, the distance to the conductor and And the magnetic field detected by the magnetic sensor to calculate the current of the electric wire to be measured.
  • Another proposal is a current measuring device described in Patent Literature 1, in which a magnetic detection coil having the same shape is parallel to the electric wire to be measured, and the relative distance to the electric wire to be measured is shifted by a predetermined dimension.
  • a magnetic sensor is provided to calculate the distance to the conductor of the measurement target wire from the difference between the magnetic fields detected by the two magnetic detection coils, and to calculate the current flowing through the measurement target wire from the obtained distance and the detected magnetic field. is there.
  • the present invention proposes a current measuring device and a current measuring method which can measure a current without clamping a sensor to an electric wire to be measured, and which is compact, does not require a complicated measuring operation, and can perform accurate measurement.
  • the purpose is to:
  • a first aspect of the present invention is a current measuring device, a proximity sensor that obtains information on the distance to a conductor of a measurement target wire, and a magnetic sensor that obtains information on a magnetic field generated by a current flowing through the measurement target wire. And a calculation processing unit that calculates a current value flowing through the measurement target wire from information on the magnetic field obtained by the magnetic sensor and information on a distance to the conductor of the measurement target wire obtained by the proximity sensor.
  • the proximity sensor is an eddy current sensor, and the planar shape of the coil of the eddy current sensor is a shape in which the longitudinal direction of the coil extends in the extension direction of the electric wire to be measured, and a plurality of coils are stacked. Preferably, it is configured.
  • Another aspect of the present invention is a current measuring method, in which a magnetic sensor acquires information on a magnetic field generated by a current flowing through a measurement target wire, and an eddy current sensor acquires information on a distance to a conductor of the measurement target wire.
  • the arithmetic processing unit calculates the value of the current flowing through the electric wire to be measured from the acquired information on the magnetic field and the information on the distance of the electric wire to be measured to the conductor.
  • the proximity sensor allows the distance to the conductor of the electric wire to be measured to be known more accurately, so that accurate current measurement is possible.
  • the sensor unit is provided with the magnetic sensor and the proximity sensor, a portable and portable device can be provided.
  • FIG. 4 is a diagram illustrating a configuration in which an eddy current sensor and a Hall element sensor of a current sensor are mounted.
  • FIG. 1 is a diagram illustrating a configuration of a current measuring device according to a first embodiment of the present invention.
  • An eddy current sensor 11 detects a distance of a wire to be measured to a conductor 2, and detects the detected distance and a magnetic field.
  • a configuration is shown in which a current flowing through the conductor 2 of the electric wire to be measured is detected from a magnetic field detected by the Hall element sensor 12 as a sensor.
  • the current measuring device includes a sensor unit 10 and a measuring device main body 20.
  • the sensor unit 10 includes an eddy current sensor 11 that is a proximity sensor that detects a distance of the electric wire to be measured to the conductor 2 and a Hall element sensor 12 that is a magnetic sensor that detects a magnetic field generated by a current flowing through the conductor 2 of the electric conductor to be measured.
  • the measuring device main body 20 includes an analog / digital converter 23 to which a signal from the eddy current sensor 11 is input, an analog / digital converter 24 to which a signal from the Hall element sensor 12 is input, and the analog / digital converters 23 and 24.
  • (Central Processing Unit) 26 as an arithmetic processing circuit to which digital signals are input, a memory 27 for storing programs or data, operation results, and the like, and connected to the CPU 26 via an interface (I / O) 28.
  • An operation unit 31, a communication unit 32, and a display unit 33 are provided.
  • the operation of the current measuring device shown in FIG. 1 will be described.
  • the signal output from the eddy current sensor 11 is converted into a digital signal by the analog / digital converter 23 and input to the CPU 26.
  • a signal output from the Hall element sensor 12 is converted into a digital signal by an analog / digital converter 24 and input to the CPU 26.
  • the CPU 26 calculates the distance between the eddy current sensor and the conductor 2 of the electric wire to be measured based on the signal from the eddy current sensor 11 based on the program stored in the memory 27, and measures the distance and the measurement from the Hall element sensor 12. Based on information on the magnetic field generated by the current flowing through the conductor 2 of the target electric wire, the value of the current flowing through the conductor 2 of the target electric wire is calculated and output and displayed on the display unit 33.
  • FIG. 2 is a schematic diagram illustrating the principle of current detection according to the present invention.
  • the eddy current sensor 11 and the Hall element sensor 12 are provided on a substrate 13 of the current sensor 10.
  • the eddy current sensor 11 and the Hall element sensor 12 are provided on the substrate 13 in the axial direction of the conductor 2 of the electric wire to be measured. It is provided in close proximity.
  • an alternating current I flows through the conductor 2 of the electric wire to be measured. Due to the current I, a circumferential induction magnetic field is generated around the axis of the conductor 2. This induction magnetic field is a magnetic field clockwise with respect to the direction of the current flowing through the conductor 2. This induction magnetic field can be detected by the Hall element sensor 12 having a magnetic flux sensing surface orthogonal to the magnetic flux.
  • the eddy current sensor 11 changes the impedance of the detection coil due to the eddy current generated on the surface of the opposing conductor 2.
  • This is a proximity sensor that detects a distance.
  • the magnetic field generated by the eddy current sensor 11 is formed in a cross-sectional direction orthogonal to the axis of the conductor 2, and the direction is also orthogonal to the induced magnetic field generated by the current flowing through the conductor 2. I do.
  • the frequency of the magnetic field generated by the eddy current sensor 11 is higher than several kHz, the frequency of the induced magnetic field generated by the current flowing through the conductor 2 detected by the Hall element sensor 12, that is, the commercial frequency of 50 Hz or 60 Hz
  • the detection band is different from the frequency. Therefore, the magnetic field generated by the current in the conductor 2 and the magnetic field of the eddy current sensor 11 do not affect each other, and have different frequencies. Therefore, it is possible to separate the detection signal through a filter.
  • information on the distance to the conductor 2 is obtained from the signal of the eddy current sensor 11, and information on the induced magnetic field of the current flowing through the conductor 2 is obtained from the signal of the Hall element sensor 12.
  • the current I flowing through the conductor 2 is expressed by the following equation (1) according to Ampere's law.
  • I 2 ⁇ rH (1)
  • H the strength of the magnetic field (magnetic field around the conductor)
  • r the distance between the measurement point of H and the conductor H is the definition of magnetic flux density and magnetic permeability expressed by the following equation (2) Is done.
  • H B / ⁇ 0 (2)
  • the magnetic permeability ⁇ 0 is the magnetic permeability in the air.
  • the magnetic permeability of the air is different from the magnetic permeability of the vacuum, but may be treated as the same. the ⁇ 0 is used.
  • the above calculation is a method of theoretically obtaining a current value
  • the following correction may be performed to reduce variations due to characteristics such as insulation coating of the electric wire, thickness of the electric wire, and location.
  • a plurality of types of wires having different insulation coating thicknesses are prepared, and the distance detected by the proximity sensor 11 is corrected.
  • a known current is caused to flow through this electric wire, and a correction formula is created so as to be equal to the actually flowing current, and is stored in the memory 27.
  • the displayed current value is corrected using the correction formula stored in the memory 27.
  • the eddy current sensor 11 detects that the inductance of the detection coil of the sensor changes due to the eddy current generated in the conductor 2, and the magnetic field generated by the detection coil of the eddy current sensor 11 leaks out of the conductor 2. Therefore, it is necessary to take measures to prevent the sensitivity from decreasing.
  • the shape of the detection coil of the eddy current sensor 11 is such that a 10-turn conductor is formed on the substrate, the longitudinal direction is the axial direction of the conductor 2, and the short direction is the width direction of the conductor 2. This detection coil was formed into a rectangular shape and laminated in ten layers. The respective layers were connected to each other by through holes.
  • the length and width of this detection coil was 6 ⁇ 3 mm. Since the magnetic field leakage is small in the width direction of the conductor 2 of the electric wire to be measured and the magnetic coupling is long in the axial direction of the conductor 2, the sensitivity as the eddy current sensor 11 can be improved.
  • FIG. 4 is a schematic diagram for explaining a structure for mounting the eddy current sensor 11 and the Hall element sensor 12 further.
  • the eddy current sensor 11 has detection coils stacked in multiple layers, and the magnetic flux sensing direction of the detection coils is orthogonal to the axial direction of the conductor 2 of the electric wire to be measured.
  • the stacked body of the stacked detection coils is attached to the substrate 13 of the sensor unit 10.
  • the magnetic flux sensing direction of the Hall element sensor is parallel to the axial direction of the conductor 2 and orthogonal to the magnetic flux sensing direction of the detection coil, so that the magnetic flux sensitivity sensing direction of the Hall element sensor is orthogonal to the substrate 13.
  • a substrate on which the Hall element sensor 12 is mounted is provided in a direction perpendicular to the substrate 13 so that the Hall element sensor 12 is mounted thereon.
  • the shape of the detection coil of the eddy current sensor is a rectangle of 6 ⁇ 3 mm, but may be an ellipse or a rhombus whose shape is flat in the axial direction of the conductor 2.
  • the number of layers is set to 10, the number of layers can be selected as needed.
  • the sensitivity of the eddy current sensor 11 depends on the strength of the magnetic coupling between the detection coil and the conductor 2 of the electric wire to be measured. The highest sensitivity is obtained when the detection coil is parallel to the conductor, that is, when the magnetic field generated by the detection coil is perpendicular to the conductor. On the other hand, when the detection coil is inclined with respect to the conductor, the magnetic coupling is weakened, and the sensitivity is reduced. For this reason, by providing a plurality of eddy current sensors 11, even if the conductor is inclined with respect to the conductor 2 of the electric wire to be measured, the uncertainty due to the inclination can be compensated.
  • the contact surface of the current sensor 10 with the electric wire to be measured may be formed so that the eddy current sensor 11 and the electric wire to be measured can be in contact with each other without tilting.
  • the surface to be contacted with the electric wire to be measured may have a shape having grooves in the axial direction.
  • a Hall element sensor is used as the magnetic sensor, but a magnetic sensor using an inductance may be used.

Abstract

Appareil de mesure de courant électrique sans serrage avec lequel il est possible de mesurer un courant dans un fil électrique à mesurer sans serrer le fil électrique à mesurer. La présente invention comprend un capteur de proximité 11 qui acquiert des informations concernant la distance à partir d'un fil électrique à mesurer jusqu'à un conducteur, et un capteur de magnétisme 12 qui acquiert des informations concernant un champ magnétique produit en raison d'un courant circulant vers le fil électrique à mesurer. Un corps 20 d'appareil de mesure comprend une CPU 26 servant de circuit de traitement informatique qui calcule une valeur de courant circulant vers le fil électrique à mesurer à partir des informations concernant un champ magnétique tel qu'acquis par le capteur de magnétisme 12 et des informations concernant la distance du fil électrique à mesurer au conducteur tel qu'acquise par le capteur de proximité 11.
PCT/JP2019/028910 2018-09-04 2019-07-23 Appareil de mesure de courant électrique et procédé de mesure de courant électrique WO2020049883A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018165222A JP2020038113A (ja) 2018-09-04 2018-09-04 電流測定装置および電流測定方法
JP2018-165222 2018-09-04

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WO2020049883A1 true WO2020049883A1 (fr) 2020-03-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023043389A1 (fr) * 2021-09-17 2023-03-23 Smarte Teknoloji Ve Enerji Sanayi Ticaret Anonim Sirketi Analyseur de puissance pour appareillage de commutation au réseau

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04233470A (ja) * 1990-12-28 1992-08-21 Energy Support Corp 非接触式距離検出器を備えた電気的物理量測定センサ
WO1996027802A2 (fr) * 1995-03-08 1996-09-12 Powex Oy Dispositif de mesure pour la mesure d'un courant circulant dans les cables aeriens d'une ligne a moyenne tension
JPH1096756A (ja) * 1996-09-24 1998-04-14 Fujikura Ltd 絶縁電線の欠陥検出方法およびその装置
JP2002081902A (ja) * 2000-09-08 2002-03-22 Toshiba Corp 位置センサ
WO2015029514A1 (fr) * 2013-08-29 2015-03-05 三菱電機株式会社 Détecteur de champ magnétique comprenant un élément à effet de magnétorésistance, et détecteur de courant
JP2018119830A (ja) * 2017-01-24 2018-08-02 日立金属株式会社 渦電流式金属センサ及び渦電流検出方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04233470A (ja) * 1990-12-28 1992-08-21 Energy Support Corp 非接触式距離検出器を備えた電気的物理量測定センサ
WO1996027802A2 (fr) * 1995-03-08 1996-09-12 Powex Oy Dispositif de mesure pour la mesure d'un courant circulant dans les cables aeriens d'une ligne a moyenne tension
JPH1096756A (ja) * 1996-09-24 1998-04-14 Fujikura Ltd 絶縁電線の欠陥検出方法およびその装置
JP2002081902A (ja) * 2000-09-08 2002-03-22 Toshiba Corp 位置センサ
WO2015029514A1 (fr) * 2013-08-29 2015-03-05 三菱電機株式会社 Détecteur de champ magnétique comprenant un élément à effet de magnétorésistance, et détecteur de courant
JP2018119830A (ja) * 2017-01-24 2018-08-02 日立金属株式会社 渦電流式金属センサ及び渦電流検出方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023043389A1 (fr) * 2021-09-17 2023-03-23 Smarte Teknoloji Ve Enerji Sanayi Ticaret Anonim Sirketi Analyseur de puissance pour appareillage de commutation au réseau

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