WO2021090479A1 - Dispositif d'assistance de mesure, dispositif d'observation de tension sans contact, et système d'observation de tension sans contact - Google Patents

Dispositif d'assistance de mesure, dispositif d'observation de tension sans contact, et système d'observation de tension sans contact Download PDF

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Publication number
WO2021090479A1
WO2021090479A1 PCT/JP2019/043895 JP2019043895W WO2021090479A1 WO 2021090479 A1 WO2021090479 A1 WO 2021090479A1 JP 2019043895 W JP2019043895 W JP 2019043895W WO 2021090479 A1 WO2021090479 A1 WO 2021090479A1
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WIPO (PCT)
Prior art keywords
voltage
coupling capacitance
probe electrode
capacitance
measurement
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Application number
PCT/JP2019/043895
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English (en)
Japanese (ja)
Inventor
慶洋 明星
雄三 玉木
勇樹 野邊
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2019/043895 priority Critical patent/WO2021090479A1/fr
Priority to JP2021554537A priority patent/JP7003339B2/ja
Publication of WO2021090479A1 publication Critical patent/WO2021090479A1/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 measurement auxiliary device that assists in measuring the coupling capacitance used for observing AC voltage, a non-contact voltage observation device and a non-contact voltage observation system that use the measurement auxiliary device.
  • the non-contact voltage observation device described in Patent Document 1 detects an AC voltage applied to a core wire of an electric wire through a coupling capacitance generated between the core wire of the electric wire and a probe electrode.
  • the AC voltage detected using the probe electrode is divided by the known capacitance that can be switched using the switch and the coupling capacitance generated between the core wire of the wire and the probe electrode, and is based on the divided voltage value.
  • the coupling capacitance is measured, and the AC voltage applied to the core wire of the electric wire is calculated based on the measured coupling capacitance.
  • the coupling capacitance generated between the probe electrode and the core wire of the electric wire is a minute capacitance estimated by regarding the insulating coating that covers the core wire of the electric wire as a dielectric. Therefore, the measurement of the binding capacitance is easily affected by the parasitic component existing inside the device.
  • the non-contact voltage observation device described in Patent Document 1 measures the coupling capacitance using a switch having a relatively large parasitic capacitance. Therefore, there is a possibility that the coupled capacitance cannot be measured accurately due to an error in the voltage value obtained by dividing the AC voltage by the parasitic capacitance of the switch.
  • the present invention solves the above problems, and an object of the present invention is to obtain a measurement auxiliary device capable of reducing parasitic components existing inside a non-contact voltage observation device, a non-contact voltage observation device using the measurement auxiliary device, and a non-contact voltage observation system. To do.
  • the measurement assisting device observes the AC voltage applied to the core wire of the electric wire through the first coupling capacitance generated between the first probe electrode and the core wire arranged in the coating film covering the core wire. It is a measurement auxiliary device that assists the measurement of the first coupling capacitance by the non-contact voltage observation device, and is a signal oscillator that oscillates a test voltage signal of a known AC voltage waveform, and a second probe electrode arranged on the coating film.
  • the test voltage signal is the second coupling generated between the first coupling capacitance, the known capacitance of the voltage dividing capacitor element, and the second probe electrode and the core wire in the non-contact voltage observation device.
  • the voltage is divided by the capacitance, the first coupling capacitance is calculated based on the divided voltage, and the second probe electrode has the first coupling capacitance and the second coupling capacitance within a certain tolerance. It is characterized in that it is configured with a structure and a size suitable for the first probe electrode so as to have similar values.
  • the test voltage signal of the known AC voltage waveform has the first coupling capacitance generated between the first probe electrode and the core wire provided in the non-contact voltage observation device, the known capacitance, and the measurement assistance.
  • the first coupling capacitance is calculated based on the voltage divided by the second coupling capacitance generated between the second probe electrode and the core wire provided in the device.
  • the second probe electrode has a structure and size adapted to the first probe electrode so that the first coupling capacitance and the second coupling capacitance have similar values within a certain margin of error. Since the first coupling capacitance is a value similar to that of the second coupling capacitance within a certain margin of error, it is possible to measure the first coupling capacitance without switching the known capacitance.
  • the measurement auxiliary device according to the present invention can remove the switch having the parasitic component from the non-contact voltage observation device, so that the parasitic component existing inside the non-contact voltage observation device can be reduced.
  • FIG. 5 is a waveform diagram showing a voltage waveform of an AC voltage to be observed and a voltage waveform of a test voltage signal in the first embodiment.
  • FIG. 1 is a block diagram showing a configuration of the non-contact voltage observation system 1 according to the first embodiment.
  • FIG. 2 is a circuit diagram showing an equivalent circuit of the non-contact voltage observation system 1 of FIG.
  • the non-contact voltage observation system 1 includes a non-contact voltage observation device 2 and a measurement auxiliary device 3.
  • Non-contact voltage observer 2 observes an AC voltage V in applied to the cable conductor 4a of the cable 4.
  • the cable 4 is a pair of two wires and transmits an AC voltage.
  • the cable conductor 4a is a core wire in the cable 4.
  • the cable coating 4b is an insulating coating that covers the cable conductor 4a.
  • the cable conductor 4a is connected AC power source 5, the AC voltage V in is applied to the cable conductor 4a by the AC power source 5.
  • the non-contact voltage observation device 2 includes a probe electrode 21, a probe cable 22, and a sensor circuit 23.
  • the probe electrode 21 and the sensor circuit 23 are connected by a probe cable 22.
  • the probe electrode 21 is the first probe electrode and is arranged on the cable coating 4b of the cable 4 which is not connected to the ground.
  • the cable conductor 4a and the probe electrode 21 are in non-contact state due to the cable coating 4b.
  • Non-contact voltage monitoring device 2 the AC voltage V in applied to the cable conductor 4a by an AC power source 5 is observed through the first coupling capacitor C 0 that occur between the cable conductors 4a and the probe electrode 21 .
  • the first coupling capacitance C 0 generated between the square probe electrode 21 having a length and width of 1 (cm) and the cable conductor 4a is a minute capacitance of about several (pF).
  • the observation of the AC voltage V in by the non-contact voltage observer 2 means that sequentially detects an AC voltage V in applied to the cable conductor 4a, the measurement of the coupling capacitance, the coupling capacitance It means to make a fixed decision.
  • the sensor circuit 23 includes a voltage dividing capacitor element 231, an operational amplifier 232, an AD converter 233, and a calculation unit 234.
  • Dividing capacitor element 231 is a capacitor element having a known capacitance C 1, one end connected to the positive input terminal of the input terminal and an operational amplifier 232 of the sensor circuit 23, the other end connected to ground ing.
  • AC voltage V in detected by the probe electrode 21 is divided by a first coupling capacitor C 0 capacitor C 1 and, the divided voltage is input to the positive input terminal of the operational amplifier 232.
  • the operational amplifier 232 is an operational amplifier that functions as a unity gain buffer amplifier, and the negative electrode input terminal is connected to the output terminal, and the positive electrode input terminal is connected to the probe electrode 21 via the probe cable 22.
  • the AC voltage divided by the first coupling capacitance C 0 and the capacitance C 1 is input to the positive electrode input terminal of the operational amplifier 232 and output as it is.
  • the AD converter 233 converts the AC voltage analog signal output from the operational amplifier 232 into a digital signal. For example, the output voltage V out in which the AC voltage Vin is divided by the first coupling capacitance C 0 and the capacitance C 1 is converted into a digital signal.
  • Calculation unit 234 based on the output voltage V out which is converted into a digital signal by the AD converter 233, and calculates the AC voltage V in to be observed.
  • the arithmetic unit 234, the AC voltage V in to be observed is calculated according to the following equation (1).
  • the first coupling capacitor C 0 and the capacitor C 1 is a known value.
  • the output voltage V out is an observed value.
  • V in ⁇ (C 0 + C 1 ) / C 0 ⁇ ⁇ V out ... (1)
  • the measurement assist device 3 is a device that assists the measurement of the coupling capacitance by the non-contact voltage observation device 2.
  • the measurement auxiliary device 3 includes a probe electrode 31, a probe cable 32, and a measurement auxiliary circuit 33.
  • the probe cable 32 connects the probe electrode 31 and the measurement auxiliary circuit 33.
  • the probe electrode 31 is a second probe electrode, and is arranged on the cable coating 4b of the cable on the side where the probe electrode 21 is arranged among the pair of two-wire cables included in the cable 4. Therefore, the cable conductor 4a and the probe electrode 31 are in a non-contact state due to the cable coating 4b. Further, as shown in FIG. 1, a second coupling capacitance C 0 is generated between the probe electrode 31 and the cable conductor 4a.
  • the probe electrode 31 has a structure and a size suitable for the probe electrode 21 so that the first coupling capacitance C 0 and the second coupling capacitance C 0 have similar values within a certain margin of error. ..
  • the structure of the probe electrode includes, for example, the shape of the electrode, the material of the electrode, the structure of attaching the electrode to the cable 4, and the state of attaching the electrode to the cable 4.
  • the size of the probe electrode includes the area of the electrode facing or contacting the cable coating 4b, the thickness of the electrode, and the size of the entire electrode.
  • a value in which the first coupling capacitance C 0 and the second coupling capacitance C 0 are similar within a certain margin of error means that the first coupling capacitance C 0 and the second coupling capacitance C 0 are completely the same. It includes cases of matching and also includes similar values within a certain margin of error.
  • the phrase "the probe electrode 31 is configured to have a structure and size suitable for the probe electrode 21" includes a case where the probe electrode 21 and the probe electrode 31 have a completely matching structure and size, and is more constant. It is also included that the structure and size of the probe electrode 21 and the probe electrode 31 are similar within the range in which a similar first coupling capacitance C 0 and a second coupling capacitance C 0 can be obtained within the tolerance of. ..
  • the measurement auxiliary circuit 33 includes a buffer circuit 331 and a high-frequency oscillator 332.
  • the buffer circuit 331 inputs the test voltage signal Vosc oscillated by the high-frequency oscillator 332 and outputs the waveform as it is to the probe cable 32.
  • the high frequency oscillator 332 is a signal oscillator that oscillates a test voltage signal Vosc having a known AC voltage waveform.
  • Test voltage signal V osc is, for example, a high frequency sinusoidal signal than the frequency of the AC voltage V in.
  • the probe electrode 21 included in the non-contact voltage observation device 2 is arranged on the cable coating 4b of the cable 4, and the probe electrode 31 included in the measurement auxiliary device 3 is provided by the probe electrode 21. It is arranged on the cable coating 4b of the same arranged cable 4. As a result, the equivalent circuit shown in FIG. 2 is configured.
  • the test voltage signal Vosc output from the high-frequency oscillator 332 transmits the buffer circuit 331, the probe cable 32, the probe electrode 31, the cable coating 4b, the probe electrode 21 and the probe cable 22 in this order, and is input to the sensor circuit 23.
  • the test voltage signal Vosc is used for the second coupling capacitance C 0 , the first coupling capacitance C 0, and the voltage division. It is divided by the capacitance C 1 of the capacitor element 231.
  • the divided voltage is input to the AD converter 233 and converted into a digital value by the AD converter 233.
  • the test voltage signal Vosc is divided by the second coupling capacitance C 0 , the first coupling capacitance C 0, and the capacitance C 1 of the voltage dividing capacitor element 231 according to the following equation (2).
  • the first coupling capacitance C 0 is calculated using the voltage (output voltage V out). However, the test voltage signal Vosc and the capacitance C 1 are known quantities.
  • the output voltage V out is an observed value.
  • the calculation unit 234 can calculate the first coupling capacitance C 0 , which is an unknown quantity, according to the following equation (2).
  • V out ⁇ C 0 / (2C 1 + C 0 ) ⁇ ⁇ Vosc ⁇ ⁇ ⁇ (2)
  • the measurement auxiliary device 3 can be a device having a housing different from that of the non-contact voltage observation device 2.
  • the auxiliary measurement of the first coupling capacitance C 0 by the measurement auxiliary device 3 is performed only once when the non-contact voltage observation device 2 is arranged on the cable 4. If the non-contact voltage observation device 2 and the measurement auxiliary device 3 are devices having separate housings, the measurement auxiliary device 3 can be removed from the cable 4 when the measurement assistance of the first coupling capacitance C 0 is completed. it can.
  • the non-contact voltage observation system 1 is provided with one measurement auxiliary device 3 for a plurality of non-contact voltage observation devices 2, only one measurement auxiliary device 3 is used to provide a plurality of non-contact voltages.
  • the measurement of the first coupling capacitance C 0 by each of the observation devices 2 is assisted.
  • the non-contact voltage observation device 2 does not require a switch for switching the known capacitance for voltage division described in Patent Document 1, a plurality of non-contact voltage observation devices are provided in a system having the above switches. In comparison, the circuit scale of the entire non-contact voltage observation system 1 is reduced. Further, since the switch having the parasitic capacitance is removed from each of the plurality of non-contact voltage observation devices 2, the first coupling capacitance C 0 can be accurately measured in each of the plurality of non-contact voltage observation devices 2.
  • the frequency of the test voltage signal V osc of the high-frequency oscillator 332 oscillates may be an integral multiple of the frequency of the AC voltage V in to be observed.
  • the AC voltage V in is possible to calculate the first coupling capacitor C 0 be output test voltage signal V osc while being applied to the cable conductor 2a.
  • Figure 3 is a waveform diagram showing a voltage waveform and a test voltage signal V osc of the voltage waveform of the AC voltage V in to be observed.
  • the frequency of the AC voltage V in is the 50 (Hz)
  • the period of the sinusoidal signal of the AC voltage V in is 20 (ms).
  • High-frequency oscillator 332 is twice the frequency of the AC voltage V in, that is, outputs a test voltage signal V osc of 100 (Hz).
  • the waveform of the output voltage V out of the operational amplifier 232 as shown in the following formula (3), the waveform of the AC voltage V in and the waveform of the test voltage signal V osc is one synthesized.
  • V out ⁇ C 0 / (C 0 + C 1 ) ⁇ V in + ⁇ C 0 / (2C 1 + C 0 ) ⁇ Vosc ... (3)
  • Calculation unit 234 corresponds to a Fourier transform on the output voltage V out at a period corresponding to (a time 20 (ms) between time T1 and time T2) AC voltage V in a sine wave signal of 1 cycle A of The process (time integration of the value obtained by multiplying V out and Vosc) is executed.
  • the frequency of the test voltage signal V osc is an integer multiple of the frequency of the AC voltage V in to be observed, an orthogonal relationship with one another waveform of the AC voltage V in and the test voltage signal V osc waveform .. Therefore, the output voltage V out by a process corresponding to the Fourier transform, the it is possible to separate the waveform of the AC voltage V in and the waveform of the test voltage signal V osc.
  • the calculation unit 234 calculates the first coupling capacitance C 0 according to the following equation (4) using the observed output voltage V out and the test voltage signal Vosc whose output waveform is known.
  • the sensor circuit 23 shown in FIG. 1 includes a calculation unit 234, but the calculation unit 234 may be provided with a device provided separately from the non-contact voltage observation device 2. Further, the function of the arithmetic unit 234 may be realized by dedicated hardware, or may be realized by a processor and a memory that execute software.
  • the test voltage signal of the known AC voltage waveform is generated between the probe electrode 21 included in the non-contact voltage observation device 2 and the cable conductor 4a.
  • the first based on the voltage divided by the second coupling capacitance C 0 generated between the coupling capacitance C 0 of 1 and the known capacitance C 1 and the probe electrode 31 and the cable conductor 4a provided in the measurement auxiliary device 3.
  • the coupling capacity C 0 of 1 is calculated.
  • the probe electrode 31 has a structure and a size adjusted to the probe electrode 21 so that the first coupling capacitance and the second coupling capacitance have similar values within a certain margin of error.
  • the measurement auxiliary device 3 can remove the switch having the parasitic component from the non-contact voltage observation device 2.
  • the parasitic component existing inside the non-contact voltage observation device 2 can be reduced.
  • the present invention is not limited to the above-described embodiment, and within the scope of the present invention, it is possible to modify any component of the embodiment or omit any component of the embodiment.
  • the measurement auxiliary device according to the present invention can be used, for example, as a non-contact voltage observation device for observing the AC voltage of a distribution system cable.
  • 1 non-contact voltage observation system 2 non-contact voltage observation device, 3 measurement auxiliary device, 4 cable, 4a cable conductor, 4b cable coating, 5 AC power supply, 21,31 probe electrode, 22, 32 probe cable, 23 sensor circuit, 33 Measurement auxiliary circuit, 231 voltage dividing capacitor element, 232 operational amplifier, 233 AD converter, 234 arithmetic unit, 331 buffer circuit, 332 high frequency oscillator.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Navigation (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un dispositif d'assistance de mesure (3) qui calcule une première capacité de couplage, qui est produite entre un conducteur de câble (4a) et une électrode de sonde (21) d'un dispositif d'observation de tension sans contact (2), sur la base de la tension obtenue en divisant la tension d'un signal de tension de test qui possède une forme d'onde de tension alternative connue par la première capacité de couplage, une capacité connue, et une deuxième capacité de couplage produite entre le conducteur de câble (4a) et une électrode de sonde (31) du dispositif d'assistance de mesure (3). La structure et la taille de l'électrode de sonde (31) sont adaptées à l'électrode de sonde (21) de sorte que la première capacité de couplage et la deuxième capacité de couplage sont des valeurs similaires dans une certaine marge d'erreur.
PCT/JP2019/043895 2019-11-08 2019-11-08 Dispositif d'assistance de mesure, dispositif d'observation de tension sans contact, et système d'observation de tension sans contact WO2021090479A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2019/043895 WO2021090479A1 (fr) 2019-11-08 2019-11-08 Dispositif d'assistance de mesure, dispositif d'observation de tension sans contact, et système d'observation de tension sans contact
JP2021554537A JP7003339B2 (ja) 2019-11-08 2019-11-08 測定補助装置、非接触電圧観測装置および非接触電圧観測システム

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PCT/JP2019/043895 WO2021090479A1 (fr) 2019-11-08 2019-11-08 Dispositif d'assistance de mesure, dispositif d'observation de tension sans contact, et système d'observation de tension sans contact

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113721071A (zh) * 2021-07-16 2021-11-30 中国电力科学研究院有限公司 一种测量非介入式对地电压的系统和方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05322958A (ja) * 1992-05-20 1993-12-07 Furukawa Electric Co Ltd:The ケーブルの識別方法
JP2015155801A (ja) * 2014-02-19 2015-08-27 オムロン株式会社 電圧計測装置および電圧計測方法
US20160187389A1 (en) * 2014-12-29 2016-06-30 Eaton Corporation Voltage sensor housing and assembly including the same
WO2016175123A1 (fr) * 2015-04-28 2016-11-03 アルプス・グリーンデバイス株式会社 Dispositif de mesure de tension sans contact

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5322958B2 (ja) 2010-01-07 2013-10-23 株式会社東芝 無線通信システム及び無線装置
US11193958B2 (en) * 2017-03-03 2021-12-07 Veris Industries, Llc Non-contact voltage sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05322958A (ja) * 1992-05-20 1993-12-07 Furukawa Electric Co Ltd:The ケーブルの識別方法
JP2015155801A (ja) * 2014-02-19 2015-08-27 オムロン株式会社 電圧計測装置および電圧計測方法
US20160187389A1 (en) * 2014-12-29 2016-06-30 Eaton Corporation Voltage sensor housing and assembly including the same
WO2016175123A1 (fr) * 2015-04-28 2016-11-03 アルプス・グリーンデバイス株式会社 Dispositif de mesure de tension sans contact

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113721071A (zh) * 2021-07-16 2021-11-30 中国电力科学研究院有限公司 一种测量非介入式对地电压的系统和方法

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