WO2021048975A1 - Dispositif de mesure de tension sans contact - Google Patents

Dispositif de mesure de tension sans contact Download PDF

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Publication number
WO2021048975A1
WO2021048975A1 PCT/JP2019/035908 JP2019035908W WO2021048975A1 WO 2021048975 A1 WO2021048975 A1 WO 2021048975A1 JP 2019035908 W JP2019035908 W JP 2019035908W WO 2021048975 A1 WO2021048975 A1 WO 2021048975A1
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Prior art keywords
electrode
voltage
pair
correction amount
conductor
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PCT/JP2019/035908
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English (en)
Japanese (ja)
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不二次 飯田
智巳 飯田
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イイダ電子株式会社
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Priority to PCT/JP2019/035908 priority Critical patent/WO2021048975A1/fr
Priority to JP2021545052A priority patent/JP7117804B2/ja
Publication of WO2021048975A1 publication Critical patent/WO2021048975A1/fr

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    • 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
    • G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive 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 non-contact type measurement technique for measuring a conductor voltage in a non-contact state with respect to the conductor.
  • Patent Document 1 Conventionally, various non-contact type measurement techniques have been proposed in which the voltage of an insulatingly coated conductor is measured in a non-contact state with respect to the conductor.
  • Patent Document 1 An example thereof is shown in Patent Document 1.
  • a plurality of electrodes for measuring the voltage of the conductor are arranged in a concentric state on the outer periphery of the conductor, so that between the electrodes and the conductor, respectively.
  • a capacitance is formed, and the voltage of the conductor is measured in a non-contact state through the capacitance.
  • the technique disclosed in Patent Document 1 is a very excellent technique, and the voltage of the conductor can be accurately measured, and the measured voltage value can be used for various purposes.
  • Patent Document 1 does not sufficiently cope with the positional deviation of the conductor to be measured by voltage, that is, the displacement of the conductor.
  • a problem of the prior art will be described by taking the case of measuring the voltage applied to the electric wire as an example.
  • the electric wire has a conductor and an insulator that covers the outer periphery of the conductor.
  • the shape of the outer peripheral surface of the electric wire and the positional relationship of the conductor with respect to the outer peripheral surface of the electric wire are not constant but change in a complicated manner.
  • the shape of the conductor itself in the electric wire cannot be said to be constant.
  • a stranded wire is often used as the conductor, and in this case, the relationship between the outer peripheral shape of the electric wire and the conductor changes in a complicated manner.
  • An object of the present invention is to provide a non-contact type voltage measuring device capable of measuring a conductor voltage in a non-contact state and with high accuracy.
  • the first invention for solving the above-mentioned problems is to provide a first pair electrode having a first electrode and a second electrode provided so as to sandwich the space outside the space for arranging the conductor, and the space.
  • a second pair electrode having a third electrode and a fourth electrode provided so as to sandwich the conductor, and the first electrode and the second electrode and the third electrode and the fourth electrode based on the voltage of the conductor.
  • the voltage measuring unit that measures the generated first electrode voltage, second electrode voltage, third electrode voltage, and fourth electrode voltage, and the first electrode voltage and the second electrode voltage, the first conductor of the conductor.
  • the first correction amount calculation means for calculating the first correction amount for correcting the displacement in the one-to-electrode direction, and the first correction amount based on the first electrode voltage, the second electrode voltage, and the first correction amount.
  • the second invention for solving the above problem uses the ratio of the first electrode voltage and the second electrode voltage as a parameter for calculating the first correction amount in the first invention, and uses the ratio of the first electrode voltage to the second electrode voltage to make the third correction. It is a non-contact type voltage measuring device characterized in that the ratio of the third electrode voltage and the fourth electrode voltage is used as a parameter for calculating the quantity.
  • a third invention for solving the above problems is a second invention for correcting the displacement of the conductor in the second pair electrode direction based on the first electrode voltage and the second electrode voltage in the first invention.
  • a second correction amount calculation means for calculating the correction amount is further provided, and the first pair electrode voltage calculation means includes the first electrode voltage, the second electrode voltage, the first correction amount, and the second correction amount.
  • the non-contact type voltage measuring device is characterized in that the corrected voltage of the first pair electrode is calculated based on the above.
  • the fourth invention for solving the above problem is the fourth invention for correcting the displacement of the conductor in the first pair electrode direction based on the third electrode voltage and the fourth electrode voltage in the first invention.
  • a fourth correction amount calculation means for calculating the correction amount is further provided, and the second pair electrode voltage calculation means includes the third electrode voltage, the fourth electrode voltage, the third correction amount, and the fourth correction amount.
  • the non-contact type voltage measuring device is characterized in that the corrected voltage of the second pair electrode is calculated based on the above.
  • the second pair electrode is on the Y axis of the Cartesian coordinate system. It is a non-contact type voltage measuring device characterized in that it is arranged in.
  • the first pair electrode is provided at an angle centered on the intersection of the X-axis and the Y-axis and starting from the X-axis. It is a non-contact type voltage measuring device characterized in that the angle and the angle at which the second pair electrode is provided are different angles and are arranged so as not to overlap each other at the above angles.
  • the seventh invention for solving the above problem is the second pair electrode at a position further away from the intersection than the distance from the intersection of the X-axis and the Y-axis to the first pair electrode. It is a non-contact type voltage measuring device characterized by being provided with.
  • a ground electrode covering the first pair electrode and the second pair electrode is provided on the outer side of the first pair electrode and the second pair electrode. This is a non-contact type voltage measuring device.
  • a non-contact type voltage measuring device capable of measuring a conductor voltage with higher accuracy in a non-contact state.
  • the term “measurement” is used in a broad concept including the concept of the term “measurement”.
  • the term “calculation” or the term “calculation processing”, the term “calculation”, and the term “calculation” are used not only for algebraic calculations such as four-rule calculation but also for a wide range of concepts including various calculations, and are used for predetermined conditions and predetermined conditions. It is used in a broad concept including processing to obtain the desired value and data based on the parameters. For example, a target value or data is obtained in advance by calculation or experiment based on predetermined conditions or parameters, stored in a storage means, and the stored content is searched by the above parameters or the like to search for the target value.
  • connection is used in a broad concept including not only a direct connection but also an indirect connection via a part, a device, or the like.
  • the Voltage Measuring Device 100 can measure a wide range of voltages from low voltage to high voltage in a non-contact state and with high accuracy. In particular, high voltage measurement is dangerous, so it is preferable to measure in a non-contact state. However, when measuring in a non-contact state, various problems arise with respect to measurement accuracy.
  • the voltage measuring device 100 solves the problem associated with the displacement of the conductor described below, and enables measurement with high accuracy.
  • FIG. 1 is an example in which the voltage measuring device 100 according to the embodiment of the present invention is applied to the measurement of the AC voltage of the electric wire 16.
  • the invention applied to the voltage measuring device 100 that is, the technical idea underlying this embodiment, is not limited to a specific frequency. As in this embodiment, it can be applied to voltage measurement in AC power in a wide range of frequencies up to high frequencies as well as in low frequency regions such as commercial AC power.
  • the invention that is, the new technical idea applied to the voltage measuring device 100 can be applied to the measurement of a wide range of voltage from a low voltage of about several V to a high voltage of several hundred kiloV or the like. As described above, the present invention does not limit the measurement target to a specific voltage or frequency. There is a need in the world to measure AC voltage with high accuracy. The technical ideas applied to the following embodiments can fully meet such needs.
  • FIG. 1 shows the basic configuration of the voltage measuring device 100 that can be applied to various power transmission and distribution methods.
  • the electric wire 16 that transmits AC power includes a core wire 12 that is a conductor and an insulating coating 14 that covers the core wire 12.
  • the AC voltage to be measured is, for example, a voltage generated in the core wire 12 when power is supplied from the AC power supply 4 to the core wire 12 of the electric wire 16.
  • One terminal 6 of the AC power supply 4 is connected to the core wire 12, and the other terminal 8 is connected to the reference potential point 20.
  • the voltage measuring device 100 can measure the AC voltage of the core wire 12 in a state where the core wire 12 is covered with the insulating coating 14 and is not in contact with the core wire 12.
  • the core wire 12 and the insulating coating 14 are shown as a simple cylindrical shape.
  • the voltage measuring device 100 can measure the voltage with high measurement accuracy even if the shape of the core wire 12 or the insulating coating 14 is other than the shape of the concentric circles.
  • the core wire 12 may be a stranded wire, or the insulating coating 14 may have a shape other than a cylindrical shape. Further, even if the core wire 12 exists at a position deviated from the center of the insulating coating 14, the voltage measuring device 100 can measure the AC voltage with high accuracy.
  • the voltage measuring device 100 includes an electrode 32 provided on the outside of the insulating coating 14 so as to face the core wire 12, a first pair electrode having the electrode 34, and an electrode 36 provided so as to face the core wire 12. It is provided with a second pair electrode having an electrode 38. Further, the voltage measuring device 100 includes a computing device 50 that measures the voltages of the electrodes 32 and 34 and the electrodes 36 and 38 and calculates the voltage of the core wire 12 with high accuracy based on the measured voltages. doing. Specifically, the arithmetic unit 50 is composed of a computer that calculates the voltage of the core wire 12 by executing a program.
  • the voltage measuring device 100 includes a measuring unit 102 and an arithmetic unit 50.
  • the arithmetic unit 50 has an operation unit 52, a measurement unit 54, an arithmetic unit 58, a storage unit 62, and an output unit 64 that outputs information by a method such as display. Further, the arithmetic unit 50 is connected to the electrode 32 and the electrode 34, and the electrode 36 and the electrode 38, and is also connected to the reference potential point 20.
  • the operation unit 52 is used for starting and ending the operation of the arithmetic unit 50 itself, selecting various other functions of the arithmetic unit 50, and executing the functions thereof.
  • the measuring unit 54 has a function of measuring the voltages of the electrode 32 and the electrode 34 and the voltage of the electrode 36 and the electrode 38, respectively.
  • the calculation unit 58 has a function of performing a correction calculation based on the measured voltage and calculating the voltage of the core wire 12 with high accuracy.
  • the storage unit 62 holds various correction data necessary for obtaining the voltage of the core wire 12, and also stores a program necessary for the arithmetic unit 50 to operate.
  • the output unit 64 outputs information necessary for the operation of the operation unit 52, for example, in a display format. Further, the measured value measured by the measuring unit 54, the data processed by the calculation unit 58, and the voltage information of the core wire 12 which is the measurement result calculated by the calculation unit 58 can be displayed by the display function or the communication function.
  • the voltage of the core wire 12 to be measured is obtained by calculation by the calculation unit 58, and the result can be output from the output unit 64 in the form of a waveform that changes continuously, for example. ..
  • the waveform of the measurement result can be output in the display format, but can also be output in the printed matter format via a printer (not shown). It is also possible to send it to a specific device in the form of digital information via a communication line.
  • FIGS. 2 and 3 show a cross section perpendicular to the Z axis when the longitudinal direction of the core line 12 is the Z axis, as a Cartesian coordinate system having an orthogonal X axis and a Y axis.
  • the electrode 32 and the electrode 34 form the first pair electrode, and these electrodes are arranged so as to sandwich the core wire 12. Further, the electrode 36 and the electrode 38 form a second pair electrode, and these electrodes are arranged so as to sandwich the core wire 12.
  • the centers of the Z-axis 10 and the core wire 12 are aligned, but in an actual measurement state, it is unlikely that the centers of the Z-axis 10 and the core wire 12 are aligned. The state in which these do not match will be described below.
  • the distances from the Z axis 10 to the electrodes 32 and 34 are the same as the distances Xa, but even if these distances are different, the measurement can be performed with high accuracy in the present invention. This also applies to the electrode 36 and the electrode 38. In the figure, the distances from the Z axis 10 to the electrode 36 and the electrode 38 are equal to the distance Yb, but there is no problem even if the distances are different.
  • the arithmetic unit 50, the core wire 12, and the ground electrode 40 are not shown in order to avoid complication.
  • the positional relationship of each electrode is set with reference to the X-axis. Further, it is represented by an angle ⁇ with the Z-axis 10 as the origin.
  • the electrode 32 is provided between the angle ⁇ 8 and the angle ⁇ 1
  • the electrode 34 is provided between the angle ⁇ 4 and the angle ⁇ 5.
  • the electrode 36 is provided between the angle ⁇ 6 and the angle ⁇ 7
  • the electrode 38 is provided between the angle ⁇ 2 and the angle ⁇ 3.
  • the electrodes 32 and 34 forming the first pair electrode and the electrodes 36 and 38 forming the second pair electrode are arranged so as not to overlap each other. There is. If these electrodes overlap, the voltage induced in each electrode based on the voltage of the core wire 12 is affected by the overlap, which adversely affects the measurement accuracy.
  • the center of the core wire 12 of the electric wire 16 exists at a position corresponding to the Z axis, but the voltage is applied with high accuracy regardless of the position where the core wire 12 exists. It is desirable to be able to measure. Therefore, in the present embodiment, as long as the core wire 12 is in the range inside the first counter electrode, it is possible to measure the voltage with high measurement accuracy by performing the correction process regardless of the position of the core wire 12. It is said. In other words, if it is inside the first counter electrode, the region can be treated as a free space in which the core wire 12 can exist, which can measure the voltage with high measurement accuracy, in this embodiment. This will be described in detail below with reference to the drawings.
  • the electrodes 32 and 34 are arranged equidistant from the Z-axis 10 and further form an arc along a circle centered on the Z-axis. doing.
  • This shape and arrangement relationship is an example, and for example, the electrode 32 and the electrode 34 do not have to be in the shape of an arc. This also applies to the electrodes 36 and 38 forming the second pair electrode.
  • the ground electrode 40 is provided at a position rc from the Z axis on the outer peripheral side of the electrode so as to further cover the electrode 32, the electrode 34, the electrode 36, and the electrode 38. ..
  • the ground electrode 40 has a circular cross section in the present embodiment, but may have a polygonal shape or another shape.
  • the electrodes 38 and 36 and the electrodes 34 and 32 are arranged so as not to overlap each other with respect to the angle ⁇ .
  • a capacitance is formed between the core wire 12 and each of the above-mentioned electrodes, and further, each of the above-mentioned electrodes and the ground electrode 40 is also electrostatically charged. Capacitance is formed. Therefore, based on the voltage of the core wire 12, a voltage is generated in the electrode 32 and the electrode 34 forming the first pair electrode and the electrode 36 and the electrode 38 forming the second pair electrode, respectively.
  • the core wire 12 is finally measured by measuring these voltages with the arithmetic unit 50.
  • the voltage can be measured in a non-contact manner.
  • the center of the core wire 12 coincides with the Z axis 10 in the positional relationship between the core wire 12 and each electrode, and the surface of the core wire 12 and the electrode
  • the distance between the facing surface of 32 and the facing surface of the electrode 34 is the same.
  • the distances between the surface of the core wire 12 and the facing surface of the electrode 36 and the facing surface of the electrode 38 are also the same. In this case, the voltage can be measured with high accuracy.
  • the inventors first analyzed the cause of the measurement error and the magnitude of the measurement error.
  • Fig. 4 shows the distance X1 in the X-axis direction from the center 13 of the core line 12 with respect to the Z-axis 10 in the Cartesian coordinate system.
  • a state of being displaced by a distance Y1 in the Y-axis direction is shown.
  • the core wire 12 is often displaced in both the X-axis direction and the Y direction in this way, but first, the relationship between the displacement in the X-axis direction and the measurement error will be described.
  • FIG. 5 the change in the voltage V32 of the electrode 32 when the core wire 12 is displaced in the X-axis direction is shown in the graph G1, and the change in the voltage V34 of the electrode 34 is shown in the graph G2. Further, the sum of the voltage V32 and the voltage V34 is shown in the graph G3.
  • Each graph of FIG. 5 shows that as the displacement of the core wire 12 in the X-axis direction increases, the voltage of the electrode closer to the core wire 12 increases. Therefore, as shown in the graph G3, the sum of the voltages of the electrode 32 and the electrode 34 increases as the displacement in the X direction increases.
  • the position of zero displacement is a state in which the detection accuracy is high, and the measurement error tends to increase as the displacement increases.
  • FIG. 6 shows the parameter of the graph of the sum of the voltage V32 and the voltage V34 described as the graph G3 in FIG. 5 divided by V32, which is the ratio of the voltage V32 and the voltage V34, from the displacement amount X1 in the X direction of the core wire 12. It is a graph changed to.
  • V32 which is the ratio of the voltage V32 and the voltage V34
  • the sum of the voltage V32 and the voltage V34 has a relatively simple shape. It becomes a graph.
  • the shape of the graph is relatively simple, the number of data to be stored may be reduced, and the correction amount may be calculated by complementary calculation, for example, by a method of approximating to a linear function.
  • the state indicated by the displacement 0 described in FIG. 6 is a state in which the core wire 12 exists on the Z axis 10, and is a state in which the measurement error is the smallest.
  • the core wire 12 is displaced with respect to the Z axis 10, and a measurement error is caused by this displacement.
  • the measurement can be easily performed from the voltage V32 and the voltage V34 of the first pair electrode. It is possible to calculate the voltage of the first pair electrode in the state indicated by the displacement 0 with the smallest error.
  • FIG. 7 shows the voltage V32 of the electrode 32 when the core wire 12 is displaced in the Y-axis direction due to the displacement of the core wire 12 in FIG. It is a graph which shows the voltage change given to the voltage V34 of an electrode 34.
  • the change in the voltage V32 of the electrode 32 due to the displacement of the core wire 12 in the Y-axis direction is shown in the graph G5, and the change in the voltage V34 of the electrode 34 is also shown in the graph G6. Further, the change in the voltage of the sum of the electrode 32 and the voltage V34 is shown in the graph G7.
  • the effect of the displacement of the core wire 12 in the Y-axis direction on the voltage V32 and the voltage V34 is smaller than the effect of the displacement in the X direction shown in FIG. Further, in the displacement in the X-axis direction shown in FIG. 5, the measurement result in the direction in which the actual voltage becomes larger as the displacement increases is obtained, but in the displacement in the Y-axis direction shown in FIG. 7, the actual value is obtained. The measurement result tends to be smaller.
  • the displacement in the Y direction shown in FIG. 7 cannot be actually measured, the displacement in the Y direction is replaced with V32 divided by V34, which is the voltage ratio Ry.
  • V32 divided by V34 which is the voltage ratio Ry.
  • This graph is shown in FIG. It is often difficult to grasp how much the core wire 12 is actually displaced in the Y-axis direction. Therefore, if the voltage ratio Ry of the electrode 32 and the electrode 34 can be used as a parameter instead of the displacement in the Y-axis direction, the correction can be performed. Further, in this case, if the voltage ratio Ry is used as a parameter, the correction data has a relatively simple shape as shown in FIG. 8, which has the effect of facilitating correction and obtaining high accuracy. In reality, the graph in FIG. 8 is a little more complicated, but it is simplified to explain the idea.
  • the correction due to the displacement of the core wire 12 in the X direction and the displacement in the Y direction can be performed. This makes it possible to measure with high accuracy. Therefore, when the core wire 12 exists in the free space inside the electrodes 32 and 34 constituting the first pair electrode, the measurement results of the first pair electrode and the second pair electrode even if the displacement cannot be specified. It is possible to accurately calculate the voltage of the first pair electrode and the second pair electrode from. From these values, the voltage of the core wire 12 can be calculated accurately.
  • the electrode 36 with respect to the displacement of the core wire 12 in the Y axis direction The voltage V36 and the voltage V38 of the electrode 38 and the electrode 38 have the tendency described in FIGS. 5 and 6. Further, the voltage V36 and the voltage V38 of the electrode 36 and the electrode 38 with respect to the displacement of the core wire 12 in the X-axis direction tend to be described in FIGS. 7 and 8. Therefore, the voltage of the second pair electrode can be corrected accurately, and an accurate voltage can be obtained. As described above, the accurate voltage of the core wire 12 can be calculated from the accurate voltage of the first pair electrode and the accurate voltage of the second pair electrode.
  • FIG. 9 shows an example of a flowchart showing the calculation processing contents of the arithmetic unit 50 described in FIG.
  • a program for arithmetic processing for measuring the voltage of each electrode and calculating the voltage Vout of the conductor to be measured is stored in the storage unit 62.
  • the storage unit 62 also stores in what format the voltage of the core wire 12 obtained by calculation is output, and a processing program for that purpose. Since this program is repeatedly executed in an extremely short cycle in response to a change in the voltage to be measured, in the present embodiment, it is possible to output the voltage change of the conductor as a highly accurate and continuous voltage waveform. Become.
  • the waveform can be output from the output unit 64 of the arithmetic unit 50 by display, by printing, or in the form of digital data.
  • step S102 the voltage V32 of the electrode 32 and the voltage V34 of the electrode 34 constituting the first pair electrode are measured by the measurement unit 54. It is temporarily held in the storage unit 62. Further, in step S102, the voltage V36 of the electrode 36 constituting the second pair electrode and the voltage V38 of the electrode 38 are measured by the measuring unit 54 and temporarily held in the storage unit 62.
  • step S104 first, the parameters for correcting the displacement of the core wire 12, which is the conductor to be measured, are obtained from the measured voltages V32 and V34. Based on this parameter, the correction amount Rx1 for the displacement in the X-axis direction and the correction amount Ry1 for the displacement in the Y-axis direction are obtained.
  • Various data can be used as parameters for the amount of correction for displacement in the X-axis direction and the Y-axis direction, but as explained with reference to FIG. 6, processing can be performed by using the ratio C1 of the measured voltage V32 to the voltage V34. It is simple and excellent in terms of improving measurement accuracy.
  • the correction amount Rx1 accompanying the displacement in the X-axis direction is derived using the ratio C1 as a parameter.
  • the graph of the correction amount has a relatively simple shape, so the amount of correction is calculated by reducing the amount of data to be stored and complementing the data with a linear graph. You may.
  • step S106 the calculated ratio C1 of the voltage V32 and the voltage V34 is used as a parameter for obtaining the correction amount Ry1 due to the displacement of the core wire 12 which is the measurement target conductor in the Y-axis direction.
  • the correction amount Ry1 accompanying the displacement of the core wire 12 in the Y-axis direction can be derived by using the ratio C1 of the measured voltage V32 and the voltage V34 as a parameter.
  • the relationship between the ratio C1 of the voltage V32 and the voltage V34 and the correction amount Ry1 is measured in advance, and the data of the correction amount Ry1 is stored in advance in the storage unit 62 with the ratio C1 as a parameter, and the value of the correction amount Ry1. May be searched based on the ratio C1.
  • the correction amount Ry1 may be calculated by a method of storing the value of the correction amount Ry1 at rough intervals and approximating it to a linear graph for complementary calculation.
  • the accurate voltage VA of the first pair electrode having the electrode 32 and the electrode 34 is obtained. Calculate based on the calculation.
  • the accurate voltage VA represents an accurate total value of the voltage V32 and the voltage V34, and the voltage of each electrode is not calculated individually.
  • the voltage of the target core wire 12 it is sufficient to be able to accurately calculate the total value of the voltage V32 and the voltage V34.
  • the following first equation shows the calculation contents related to the above-mentioned processing.
  • Voltage VA (voltage V32 + voltage V34) x Rx1 x Ry1 ... (1)
  • the voltage VA can be calculated with extremely high accuracy.
  • the voltage of the core wire 12 can be measured with very high accuracy.
  • the displacement of the core wire 12 on the X-axis is a major factor in lowering the measurement accuracy.
  • the displacement of the core wire 12 on the Y-axis also causes a decrease in measurement accuracy, but its influence is very small as compared with the displacement of the core wire 12 on the X-axis. Therefore, if the displacement of the core wire 12 on the X-axis is corrected, the voltage VA related to the first pair electrode is measured with high measurement accuracy without correcting the displacement of the core wire 12 on the Y-axis. be able to. Therefore, if the displacement of the core wire 12 on the X-axis is corrected, the voltage of the core wire 12 can be measured with high accuracy.
  • Steps S110 to S114 show a calculation processing procedure for calculating the voltage of the second pair electrode, that is, a highly systematic measurement method for the voltage V36 and the voltage V38 of the electrode 36 and the electrode 38.
  • the basic idea is the same as in the case of the first pair electrode described above.
  • step S110 the ratio C2 of the voltage V36 of the electrode 36 and the voltage V38 of the electrode 38 is calculated as a parameter for obtaining the correction amount due to the displacement in the Y-axis direction. From this ratio C2, the correction amount Ry2 for calculating the voltage VB of the second pair electrode is obtained.
  • the relationship between the ratio C2 of the voltage V36 and the voltage V38 and the correction amount Ry2 is measured in advance, and the ratio C2 is stored in advance in the storage unit 62 as a parameter.
  • the correction amount Ry2 is searched and obtained by using the ratio C2 obtained based on the voltage V36 and the voltage V38 of the electrode 36 and the electrode 38 as a parameter.
  • the correction amount Ry2 may be calculated by storing the data in a state of being spaced apart and complementing the data by algebraic calculation.
  • the relationship between the ratio C2 of the voltage V36 and the voltage V38 as a parameter and the correction amount Ry2 is a condition that the displacement direction of the core wire 12 to be corrected and the axis on which the second pair electrode is arranged match.
  • the conditions are the same as those described in FIGS. 5 and 6 described above. Therefore, the correction amount can be calculated by the same idea.
  • the displacement of the core wire 12 in the Y-axis direction becomes a factor that increases the measurement error. This state is the same as the contents described in FIGS. 5 and 6 described above, and the measurement accuracy is greatly improved by correcting the displacement of the core wire 12 in the Y-axis direction.
  • the correction amount for the displacement of the core wire 12 in the X-axis direction is calculated in step S112.
  • the correction amount Rx2 is searched from the storage unit 62 using the ratio C2 of the voltage V36 and the voltage V38 calculated in step S110 as a parameter.
  • the relationship between the ratio C2 and the correction amount Rx2 is measured in advance, and the data of the correction amount Rx2 is stored in the storage unit 62 with the ratio C2 as a parameter.
  • the required correction amount Rx2 data can be calculated by searching the ratio C2 calculated in step S110 as a parameter.
  • the accurate voltage at the second pair electrode having the electrode 36 and the electrode 38 can be calculated. It will be described in detail below. From the voltage V36 of the electrode 36 and the voltage V38 of the electrode 38 obtained in the previous step, and the calculated correction amount Ry2 and the correction amount Rx2, the accurate voltage VB of the second pair electrode is calculated based on the equation 2. ..
  • the calculated voltage VB represents the exact total voltage of the voltages of the electrode 36 and the electrode 38 in consideration of the displacement of the core wire 12. The total voltage VB is corrected not only by the displacement of the core wire 12 but also by the difference in the distance between the Z-axis 10 and each electrode.
  • R is represented by VA / VB.
  • a is a constant.
  • Equation 3 is an example of calculating the voltage Vout and is not limited to Equation 3. That is, since the positional relationship between the first pair electrode and the second pair electrode is known, and the displacement of the core wire 12 in the X-axis direction and the displacement in the Y-axis direction are corrected, the core wire is derived from the voltage VA and the voltage VB. The exact voltage of 12 can be obtained.
  • step S116 the ratio R of the voltage VA and the voltage VB is calculated.
  • step S118 the accurate voltage of the core wire 12 is calculated.
  • a major factor that causes a measurement error of the voltage VA of the first pair electrode is the displacement of the core wire 12 in the same axial direction as the axis on which the first pair electrode is arranged. In this embodiment, it is the displacement in the X-axis direction. Therefore, by calculating and correcting the correction amount Rx1 regarding the displacement in the X-axis direction, the measurement accuracy is greatly improved.
  • a major factor that causes a measurement error of the voltage VB of the second pair electrode is the displacement of the core wire 12 in the same axial direction as the axis on which the second pair electrode is arranged.
  • the displacement is in the Y-axis direction. Therefore, by calculating and correcting the correction amount Ry1 regarding the displacement in the Y-axis direction, the measurement accuracy is greatly improved.
  • the core wire 12 is inside the first counter electrode. It is possible to accurately perform correction based on displacement regardless of the position of, and it is possible to measure the voltage of the core wire 12 with high accuracy.
  • the insulating coating 14 is present on the outer periphery thereof, but as a result of examination by the inventor and the like, the voltage ratio of the first pair electrode or the second pair electrode It was found that the displacement content can be easily grasped from the voltage ratio of.
  • paired electrodes such as the first pair electrode and the second pair electrode are used, and the first pair is further used.
  • the distance between the electrodes constituting the second pair electrode is increased with respect to the electrodes.
  • the voltage ratio of each counter electrode is used as a parameter related to the displacement of the core wire 12.
  • the measured voltage value will be affected due to the change in capacitance and the like.
  • the distance between the electrodes of the second pair electrode is increased with respect to the first pair electrode, and the voltage ratio of each electrode constituting the first pair electrode and the second pair electrode is used as a correction parameter.
  • the voltage of the core wire 12 is calculated based on the voltage ratio of the first pair electrode and the voltage ratio of the second pair electrode. The effect of is very small.
  • the electrode shape and number of electrodes of the first pair electrode and the second pair electrode can be freely changed.
  • the electrodes constituting the first pair electrode and the second pair electrode are formed into an arc shape.
  • the first pair electrode and the second pair electrode are set as one set, but a plurality of electrodes may be provided for each. Further, regarding the processing when a plurality of treatments are provided, for example, averaging may be performed, or other processing methods may be used.
  • the measurement is completed in an extremely short time with respect to the fluctuation cycle of the AC voltage of the measurement target. Therefore, the target voltage is continuously measured by repeating the measurement operation. can do. It is possible to output high-precision measurement results coaxially, for example, as a continuous waveform in response to usage requirements.
  • FIG. 10 shows other embodiments of the present invention.
  • the arithmetic processing of the arithmetic unit 50 is the same as that of the previous embodiment, and disclosure and description of the arithmetic unit 50 will be omitted.
  • the electric wire 16 includes a core wire 12 inside.
  • the voltage measuring device 100 has an electric wire holder 222 and an electric wire holder 224 for fixing the positional relationship between the first pair electrode or the second pair electrode and the electric wire 16 by fixing the electric wire 16 to the measuring unit 102.
  • the first pair electrode is not composed of one electrode 32 and one electrode 34, but the electrode 32 is composed of a plurality of electrodes 321 and 322 provided along the longitudinal direction of the electric wire 16. ing.
  • the electrode 36 is composed of a plurality of electrodes 341 and 342 provided along the longitudinal direction of the electrode 34 electric wire 16.
  • the electrodes 321 and 322 and the electrodes 341 and 342 are arranged so as to sandwich the electrodes 36, respectively.
  • the electrode 36 may also be composed of a plurality of electrodes.
  • the electrode 36, the electrode 321 and the electrode 322, the electrode 341, and the electrode 342 are respectively arranged in the electrode holding portion 234, and are fixed with a resin or the like so that their positional relationships do not change.
  • the electrode holding portion 234 is fixed to the electric wire holder 222 and the electric wire holder 224 by the fixing tool 230.
  • the measuring unit 102 of the voltage measuring device 100 has a structure that can be split in half along the longitudinal direction of the electric wire 16. In a state where the measuring unit 102 is divided in half, the electric wire holder 222 and the electric wire holding By arranging the electric wire 16 inside the tool 224 and returning the divided measurement unit 102 to an integrated state, the positional relationship between the electric wire 16 and the electrode holding unit 232 is determined.
  • a free space 210 which is a measurable region, is formed inside the electrode holding portion 232.
  • the electric wire 16 has a linear shape in the longitudinal direction, but the shape change such as warping inside the free space 210, that is, even if the electric wire 16 is bent, the voltage of the core wire 12 can be accurately measured. ..
  • FIG. 11 is still another embodiment.
  • the electrode 32, the electrode 34, the electrode 36, and the electrode 38 are provided, and the ground electrode 40 is provided on the outside of the electrode 32, the electrode 34, the electrode 36, and the electrode 38.
  • the electrodes 32 and 34 and the electrodes 36 and 38 have an arc shape, but the shape of these electrodes does not have to be an arc shape, as described above several times.
  • it has an octagonal shape. As described above, there is no problem even if the ground electrode 40 is polygonal. However, it is necessary to provide a free space 210 for arranging the electric wire 16 inside the electrode 32 and the electrode 34 forming the first pair electrode.
  • the cross section of the ground electrode 40 should be close to a circle. For this reason, hexagons, octagons, or more polygons are preferable.
  • the ground electrode 40 When the ground electrode 40 is octagonal, the electrodes 32 and 34, and the electrodes 36 and 38 correspond to the four octagonal surfaces, which is excellent for producing the measuring unit 102. Further, in order to arrange the electric wire 16 in the free space 210, it is necessary to divide the measuring unit 102. An example of the divided portion is shown as a divided surface 202. If the ground electrode 40 has an octagonal shape, it is also appropriate for dividing into two.

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

Abstract

La présente invention vise à fournir un dispositif de mesure de tension sans contact qui peut mesurer la tension d'un conducteur dans un état sans contact et avec une précision élevée.　Le dispositif de mesure de tension sans contact comporte les éléments suivants : un premier moyen de calcul de valeur de correction qui est constitué d'une première contre-électrode comportant une première électrode et une deuxième électrode, et d'une seconde contre-électrode comportant une troisième électrode et une quatrième électrode, et qui calcule une première valeur de correction pour corriger le déplacement du conducteur dans la direction de la première contre-électrode ; un premier moyen de calcul de tension de contre-électrode qui calcule la tension corrigée pour la première contre-électrode sur la base de la première valeur de correction ; un troisième moyen de calcul de valeur de correction qui calcule une troisième valeur de correction pour corriger le déplacement du conducteur dans la direction de la seconde contre-électrode ; et un second moyen de calcul de tension de contre-électrode qui calcule la tension corrigée pour la seconde contre-électrode, sur la base de la troisième valeur de correction. Le dispositif de mesure de tension sans contact calcule la tension du conducteur sur la base de la tension de la première contre-électrode et de la tension de la seconde contre-électrode.
PCT/JP2019/035908 2019-09-12 2019-09-12 Dispositif de mesure de tension sans contact WO2021048975A1 (fr)

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PCT/JP2019/035908 WO2021048975A1 (fr) 2019-09-12 2019-09-12 Dispositif de mesure de tension sans contact
JP2021545052A JP7117804B2 (ja) 2019-09-12 2019-09-12 非接触型電圧計測装置

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Publication number Priority date Publication date Assignee Title
WO2022172312A1 (fr) * 2021-02-09 2022-08-18 三菱電機株式会社 Dispositif de mesure de tension sans contact et procédé de mesure de tension sans contact
JP7359497B1 (ja) 2023-02-20 2023-10-11 イイダ電子株式会社 非接触型電圧計測装置

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US20110148393A1 (en) * 2009-12-18 2011-06-23 Kinects Solutions Inc. System and device for measuring voltage in a conductor
US20160124035A1 (en) * 2013-06-19 2016-05-05 3M Innovative Properties Company Conductor assembly
JP2016223818A (ja) * 2015-05-27 2016-12-28 パナソニックＩｐマネジメント株式会社 プローブ及びそれを用いた電圧測定装置
WO2017168608A1 (fr) * 2016-03-30 2017-10-05 株式会社日立システムズ Dispositif de mesure de tension sans contact et procédé de mesure de tension sans contact

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JPS5962622U (ja) * 1982-10-19 1984-04-24 三菱電機株式会社 ガス絶縁ブツシング
US20110148393A1 (en) * 2009-12-18 2011-06-23 Kinects Solutions Inc. System and device for measuring voltage in a conductor
US20160124035A1 (en) * 2013-06-19 2016-05-05 3M Innovative Properties Company Conductor assembly
JP2016223818A (ja) * 2015-05-27 2016-12-28 パナソニックＩｐマネジメント株式会社 プローブ及びそれを用いた電圧測定装置
WO2017168608A1 (fr) * 2016-03-30 2017-10-05 株式会社日立システムズ Dispositif de mesure de tension sans contact et procédé de mesure de tension sans contact

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022172312A1 (fr) * 2021-02-09 2022-08-18 三菱電機株式会社 Dispositif de mesure de tension sans contact et procédé de mesure de tension sans contact
JP7359497B1 (ja) 2023-02-20 2023-10-11 イイダ電子株式会社 非接触型電圧計測装置

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