WO2021090478A1 - Dispositif d'observation de tension sans contact - Google Patents

Dispositif d'observation de tension sans contact Download PDF

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Publication number
WO2021090478A1
WO2021090478A1 PCT/JP2019/043894 JP2019043894W WO2021090478A1 WO 2021090478 A1 WO2021090478 A1 WO 2021090478A1 JP 2019043894 W JP2019043894 W JP 2019043894W WO 2021090478 A1 WO2021090478 A1 WO 2021090478A1
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WIPO (PCT)
Prior art keywords
voltage
operational amplifier
output
cable
impedance
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PCT/JP2019/043894
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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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Priority to PCT/JP2019/043894 priority Critical patent/WO2021090478A1/fr
Priority to JP2021554536A priority patent/JP7003338B2/ja
Publication of WO2021090478A1 publication Critical patent/WO2021090478A1/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 voltage observing device that observes an AC voltage applied to the core wire of an electric wire.
  • Patent Document 1 describes a non-contact voltage observing device that observes an AC voltage applied to a core wire of an electric wire through a coupling capacitance generated between a probe electrode and the core wire of the electric wire.
  • the AC voltage detected by using the probe electrode is divided and then input to the buffer amplifier, and the voltage value output from the buffer amplifier is used as an observation target. AC voltage is calculated.
  • the inside of the non-contact voltage observation device is in a high impedance state. In this impedance state, there is a problem that the phase shift of the AC voltage due to the parasitic component existing inside the non-contact voltage observation device occurs.
  • the input resistance of an operational amplifier that functions as a buffer amplifier is a parasitic component that is the real part of complex impedance, and the phase of the AC voltage is rotated by 90 ° in the operational amplifier.
  • the phase of the AC voltage may further shift from 90 ° due to the combined complex impedance of these parasitic components. is there.
  • the present invention solves the above problems, and an object of the present invention is to obtain a non-contact voltage observation device capable of suppressing a phase shift of an AC voltage to be observed.
  • the non-contact voltage observation device includes a probe electrode arranged on a coating film covering the core wire of an electric wire, an impedance circuit in which an input end is connected to the probe electrode and simulates a complex impedance from the core wire to the input end.
  • the positive electrode input terminal is connected to the ground
  • the negative electrode input terminal is connected to the input end of the impedance circuit
  • an operational capacitor that outputs an AC voltage having a phase opposite to the AC voltage applied to the core wire is provided.
  • the impedance circuit simulates the complex impedance from the core wire to the input end of the electric wire, the inside of the device is high even if the coupling capacitance generated between the probe electrode and the core wire is a minute capacitance. It does not enter the impedance state. As a result, the non-contact voltage observation device according to the present invention can suppress the phase shift of the AC voltage to be observed.
  • FIG. It is a block diagram which shows the structure of the non-contact voltage observation apparatus which concerns on Embodiment 1.
  • FIG. It is a circuit diagram which shows the equivalent circuit of the non-contact voltage observation apparatus of FIG.
  • It is a circuit diagram which shows the structure of the impedance circuit (example 1) in Embodiment 1.
  • FIG. It is a circuit diagram which shows the structure of the impedance circuit (example 2) in Embodiment 1.
  • FIG. It is a schematic diagram which shows the outline of the operation of the phase compensation circuit in Embodiment 1.
  • FIG. It is a circuit diagram which shows the equivalent circuit of the non-contact voltage observation apparatus which concerns on Embodiment 2.
  • It is a schematic diagram which shows the outline of the operation of the phase compensation circuit in Embodiment 2.
  • FIG. It is a block diagram which shows the structure of the non-contact voltage observation apparatus which concerns on Embodiment 3.
  • FIG. 1 is a block diagram showing a configuration of the non-contact voltage observation device 1 according to the first embodiment.
  • FIG. 2 is a circuit diagram showing an equivalent circuit of the non-contact voltage observation device of FIG.
  • Non-contact voltage observation apparatus 1 observes the AC voltage V in applied to the cable conductor 2a.
  • the cable 2A and the cable 2B are a pair of two wires and transmit an AC voltage.
  • the cable conductor 2a is a core wire in the cable 2A and the cable 2B.
  • the cable coating 2b is an insulating coating that covers the cable conductor 2a.
  • the cable conductor 2a is connected AC power source 3, the AC voltage V in to the cable conductor 2a is applied by the AC power source 3.
  • cable 2A and cable 2B are collectively referred to as cable 2.
  • the sensor circuit 12 includes a phase compensation circuit 13.
  • the phase compensation circuit 13 includes an impedance circuit 14 and a first operational amplifier 15.
  • the AC voltage output from the phase compensation circuit 13 is input to the second operational amplifier 16.
  • the second operational amplifier 16 is an output operational amplifier in which the negative electrode input terminal is connected to the output terminal and the positive electrode input terminal is connected to the output terminal of the first operational amplifier 15, and functions as a unity gain buffer amplifier. For example, when the AC voltage output from the first operational amplifier 15 is input to the positive electrode input terminal of the second operational amplifier 16, it is output from the second operational amplifier 16 as it is.
  • the AD converter 17 converts an AC voltage analog signal output from the second operational amplifier 16 into a digital signal.
  • the input end of the impedance circuit 14 is connected to the probe electrode 10 via the probe cable 11, and the output end of the impedance circuit 14 is connected to the output terminal of the first operational amplifier 15.
  • the positive electrode input terminal of the first operational amplifier 15 is connected to the ground, and the negative electrode input terminal of the second operational amplifier 16 is connected to the input terminal of the impedance circuit 14.
  • the input end of the impedance circuit 14 is in a virtual short-circuited state (VS) as shown in FIG.
  • the impedance circuit 14 includes, for example, a first inductor element having an inductance L 1 , a first capacitor element having a capacitance C 1, and a first resistance element having a resistor R 1.
  • the first inductor element and the first capacitor element are connected in series, and the first resistance element is connected in parallel with the first capacitor element.
  • the end of the first inductor element on the cable 2 side is the input end of the impedance circuit 14
  • the end of the first capacitor element on the first operational amplifier 15 side is the output end of the impedance circuit 14. is there.
  • the complex impedance Z int from the input end to the output end of the impedance circuit 14 is the complex impedance of the inductance L 1 of the first inductor element, the capacitance C 1 of the first capacitor element, and the resistance R 1 of the first resistance element. It is composed of.
  • the complex impedance Z int of the impedance circuit 14 simulates the complex impedance Z obs (hereinafter, referred to as the complex impedance Z obs of the observation system) from the cable conductor 2a to the input end of the impedance circuit 14.
  • the resistor R 0 is a pull-down resistor provided to prevent the node potential inside the sensor circuit 12 from becoming unstable in terms of direct current, and is not included in the impedance simulating the complex impedance Z obs.
  • the impedance circuit 14 can be configured according to the frequency of the AC voltage applied from the AC power supply 3 to the cable conductor 2a.
  • FIG. 3 is a circuit diagram showing a configuration of an impedance circuit (Example 1) according to the first embodiment.
  • Example 1 a is the impedance circuit 14A, if the AC power supply 3 frequency of the AC voltage V in applied to the cable conductor 2a is high (e.g., several GHz) is a circuit corresponding to.
  • the impedance circuit 14A includes a first capacitor element 141 and a first inductor element 142 connected in series with each other.
  • the first inductor element 142 is an element that simulates the inductance of the probe cable 11, and the inductance of the probe cable 11 and the inductance L 1 of the first inductor element 142 are equivalent.
  • the inductance of the probe cable 11 is estimated in advance based on the cable length of the probe cable 11 or measured from the probe cable 11.
  • the inductor element in which the inductance thus obtained is equivalent to the inductance is selected as the first inductor element 142.
  • Equation (1) V in is the amplitude of the AC voltage applied to the cable conductors 2a
  • V out is the amplitude of the observed AC voltage by the sensor circuit 12.
  • the gain G is the gain of the AC voltage observed by the sensor circuit 12, and is a real value.
  • V out -G x V in ...
  • G Z int / Z obs ... (2)
  • the complex impedance Z int simulated by the impedance circuit 14A is a real multiple (G times) of the complex impedance Z obs of the observation system.
  • V out depends on the value of the complex impedance Z int , and is inverting amplified or inverting attenuated by the gain G.
  • the gain G becomes a real number larger than 1, and the complex impedance Z int becomes larger than the complex impedance Z obs.
  • the gain G is set to a value in a range in which the phase rotation of V out due to the parasitic component existing in the sensor circuit 12 does not occur.
  • FIG. 4 is a circuit diagram showing a configuration of an impedance circuit (Example 2) according to the first embodiment.
  • Example 2 a is the impedance circuit 14B, when the AC power supply 3 frequency of the AC voltage V in applied to the cable conductor 2a is low (e.g., 50 Hz or 60Hz is applied from the commercial AC power supply) is a circuit corresponding to.
  • the impedance circuit 14B includes a first capacitor element 141 and a first resistance element 143 connected in parallel with each other.
  • the first capacitor element 141 simulates the coupling capacitance C 0 generated between the cable conductor 2a and the probe electrode 10 in the same manner as in the circuit shown in FIG.
  • the first resistance element 143 is an element that simulates the insulation resistance of the cable coating 2b, and the insulation resistance of the cable coating 2b and the resistance R1 of the first resistance element 143 are equivalent.
  • the insulation resistance of the cable coating 2b is estimated in advance based on the insulating material of the cable coating 2b and the size of the probe electrode 10.
  • a resistance element in which the insulation resistance and the resistance R 1 are equivalent is selected as the first resistance element 143.
  • the above equations (1) and (2) are satisfied with respect to the complex impedance Z obs of the observation system.
  • the impedance circuit 14 in the first embodiment is not limited to the configuration shown in FIGS. 3 and 4.
  • the impedance circuit 14 includes an element that simulates other parasitic components in addition to the coupling capacitance C 0 , the inductance of the probe cable 11, and the insulation resistance of the cable coating 2b.
  • the impedance circuit 14 may include a resistance element that simulates the conductor resistance of the probe cable 11, and may include a resistance element that simulates the parasitic capacitance of the connector portion that connects the probe cable 11 to the sensor circuit 12.
  • FIG. 5 is a schematic diagram showing an outline of the operation of the phase compensation circuit 13.
  • the positive electrode input terminal of the first operational amplifier 15 is electrically connected to the ground, and the negative electrode input terminal is connected to the input terminal of the impedance circuit 14.
  • the input end of the impedance circuit 14 is in a virtual short-circuited state (VS) with respect to the ground.
  • the first operational amplifier 15 outputs an AC voltage that cancels out the AC voltage detected by the probe electrode 10 and input to the impedance circuit 14 so that the positive electrode input terminal and the negative electrode input terminal have the same voltage. That is, the first operational amplifier 15, the output voltage V out to the AC voltage V in to be observed is operated so as to follow a state in which phase inversion (reverse phase) was.
  • the gain G is a real number determined by the ratio of the complex impedance Z int and the complex impedance Z obs as shown in the above equation (2).
  • the gain G is smaller than 1 real number.
  • Waveform of the output voltage V out as shown in FIG. 5, a waveform obtained by inverting attenuated AC voltage V in.
  • the cable conductor 2a it is assumed that the AC voltage V in of ⁇ 100 (V) by the AC power source 3 at 50 (Hz) is applied.
  • the output voltage V out of the first operational amplifier 15 becomes ⁇ 2 (V) according to the above equation (1).
  • the first capacitor element in the impedance circuit 14B The capacitance C 1 of 141 is 250 (pF), and the resistance R 1 of the first resistance element 143 is 500 (k ⁇ ).
  • the AC voltage V in is an AC voltage of opposite phase.
  • the second operational amplifier 16 outputs the AC voltage output from the first operational amplifier 15 as an output voltage V out with the same waveform.
  • the AD converter 17 converts the output voltage V out output from the second operational amplifier 16 into a digital signal. Although digital signal converted by the AD converter 17 is in a state of reverse phase to the AC voltage V in, simply by reversing the sign of the digital signal, a digital signal of the AC voltage V in to be observed is obtained.
  • the impedance circuit 14 simulates the complex impedance zobs of the observation system, so that the device even if the coupling capacitance C 0 is a minute capacitance. The inside of is not in a high impedance state.
  • non-contact voltage monitoring device 1 can suppress the phase shift of the AC voltage V in.
  • the first operational amplifier 15 the positive electrode input terminal is connected to the ground, and the negative electrode input terminal is connected to the input terminal of the impedance circuit 14.
  • the input end of the impedance circuit 14 is virtually short-circuited, and the first operational amplifier 15 operates so that the output voltage V out accurately follows the AC voltage Vin to be observed in the opposite phase. since the AC voltage of opposite phase is observed with high accuracy and an AC voltage V in. By reversing the sign of the AC voltage of the observed opposite phase, it is possible to calculate the AC voltage V in to be observed.
  • the non-contact voltage observation device described in Patent Document 1 corrects the phase rotation of the AC voltage caused by the resistance component of the cable coating 2b.
  • a non-contact voltage monitoring device described in Patent Document 1 due to the binding capacity C 0 is a small volume, inside the apparatus becomes high impedance state, due to the parasitic components existing in the apparatus A phase shift of the AC voltage occurs. Therefore, non-contact voltage monitoring device described in Patent Document 1, can not be observed accurately AC voltage V in and the phase of the observation target.
  • the non-contact voltage observation apparatus 1 according to the first embodiment it is possible to suppress the phase shift itself of the AC voltage V in, the AC voltage V in and the phase of the observation target to observe accurately It is possible.
  • FIG. 6 is a circuit diagram showing an equivalent circuit of the non-contact voltage observation device 1A according to the second embodiment.
  • Non-contact voltage observation apparatus 1A as well as non-contact voltage monitoring device 1, an AC power source 3 by an apparatus for observing the AC voltage V in applied to the cable conductors 2a, a phase compensation circuit in the configuration shown in FIG. 1 A phase compensation circuit 13A is provided instead of 13.
  • the phase compensation circuit 13A is a first circuit having an impedance circuit 14C and a first operational amplifier 15A.
  • the description of the AD converter 17 is omitted in FIG. 6, it is assumed that the non-contact voltage observation device 1A includes the AD converter 17 as in the non-contact voltage observation device 1.
  • Impedance circuit 14C is a circuit for simulating a complex impedance Z obs of the observation system, it comprises a second resistive element 144, a third resistor element 145 and the second capacitor element 146.
  • One end of the second resistance element 144 is connected to the input end (end on the cable 2 side) of the impedance circuit 14C, and the other end is connected to the output terminal of the first operational amplifier 15A.
  • the positive electrode input terminal of the first operational amplifier 15A is electrically connected to the ground, and the negative electrode input terminal is connected to the input terminal of the impedance circuit 14C.
  • the input end of the impedance circuit 14C and the end of the second resistance element 144 connected to the input end are in a virtual short-circuited state (VS).
  • the output voltage V 1 of the first operational amplifier 15A is divided by the resistance R 3 of the third resistance element 145 and the capacitance C 2 of the second capacitor element 146, and the divided voltage is divided.
  • FIG. 7 is a schematic diagram showing an outline of the operation of the phase compensation circuit 13A in the second embodiment.
  • the non-contact voltage monitoring device 1A, the complex impedance Z obs the observation system is a reactance Z C0 of the coupling capacitance C 0.
  • the end portion connected to the input terminal of the impedance circuit 14C in the second resistive element 144 is in a state of being virtually shorted, the output voltage V 1 of the AC voltage V in and the first operational amplifier 15A, the following formula It has the relationship of (3).
  • V 1 -(R 2 / Z obs ) x V in ... (3)
  • the output voltage V 1 of the first operational amplifier and the output voltage V out of the second operational amplifier 16 have the relationship of the following equation (4).
  • Z C2 is the reactance of the second capacitor element 146.
  • V out Z C2 / (R 3 + Z C2 ) ⁇ V 1 ... (4)
  • V out -Z C2 / (R 3 + Z C2 ) x (R 2 / Z C0 ) x V in ... (5)
  • the first operational amplifier 15A operates so that the output voltage V 1 follows the AC voltage Vin in opposite phase.
  • the output voltage V 1 is divided by the resistance R 3 of the third resistance element 145 and the capacitance C 2 of the second capacitor element 146, and the output voltage V out, which is the divided voltage, is transferred to the second operational amplifier 16. It is output.
  • the output voltage V out accurately follows the observation target AC voltage V in in opposite phase.
  • (R 2 / R 3 ) ⁇ (Z C2 / Z C0 ) in the above equation (6) is the gain G, which is a real value.
  • the impedance circuit 14C is, to simulate the complex impedance Z obs of the observation system, not inside the device is in a high impedance state, due to the parasitic components phase shift of the AC voltage V in that is suppressed. Further, in the first operational amplifier 15A, the positive electrode input terminal is connected to the ground and the negative electrode input terminal is connected to the input terminal of the impedance circuit 14C.
  • the input terminal of the impedance circuit 14C becomes a state of being virtually shorted
  • the first operational amplifier 15A is operated so that the output voltages V 1 to the AC voltage V in to be observed to follow exactly the reverse phase since the output voltage V 1 of the opposite phase is observed with high accuracy and an AC voltage V in.
  • the observed output voltage V 1 it is possible to calculate the AC voltage V in to be observed.
  • FIG. 8 is a block diagram showing a configuration of the non-contact voltage observation device 1B according to the third embodiment.
  • the non-contact voltage observation device 1B is a device for observing the difference between the AC voltage applied to each of the cable conductors 2a of the pair of two-wire cables 2A and the cable 2B.
  • the cable 2A and the cable 2B are electric wires that transmit an AC voltage.
  • the cable conductor 2a is a core wire of the cable 2A and the cable 2B.
  • the cable coating 2b is an insulating coating that covers the cable conductor 2a.
  • the cable conductors 2a of the cable 2A and cable 2B AC power source 3 is connected is different from the FIG. 1, the cable conductor 2a, the AC voltage V in is applied by the alternating-current power supply 3.
  • the non-contact voltage observation device 1B includes a probe electrode 10A, a probe electrode 10B, a probe cable 11A, a probe cable 11B, and a sensor circuit 12A.
  • the probe electrode 10A and the sensor circuit 12A are connected by a probe cable 11A, and the probe electrode 10B and the sensor circuit 12A are connected by a probe cable 11B.
  • the phase compensation circuit 13A and the phase compensation circuit 13B are first circuits having an impedance circuit 14 and a first operational amplifier 15, respectively.
  • the AC voltage output from the phase compensation circuit 13A is input to the second operational amplifier 16A, and the AC voltage output from the phase compensation circuit 13B is input to the second operational amplifier 16B.
  • the probe electrode 10A is arranged on the cable coating 2b of the cable 2A
  • the probe electrode 10B is arranged on the cable coating 2b of the cable 2B.
  • the first unit via coupling capacitor C 0 that occur between the cable conductors 2a and the probe electrode 10A via a cable coating 2b, observing the AC voltage V in applied to the cable conductor 2a.
  • the second unit via coupling capacitor C 0 that occur between the cable conductors 2a and the probe electrode 10B via a cable coating 2b, observing the AC voltage V in applied to the cable conductor 2a.
  • the second operational amplifier 16A and the second operational amplifier 16B are output operational amplifiers that function as unity gain buffer amplifiers, and the negative negative input terminal is connected to the output terminal and the positive positive input terminal is connected to the output terminal of the first operational amplifier 15. Has been done.
  • the AC voltage input from the first operational amplifier 15 to the positive input terminal of the second operational amplifier 16A is output as an output voltage V out from the second operational amplifier 16A with the same waveform.
  • the AC voltage input from the first operational amplifier 15 to the positive input terminal of the second operational amplifier 16B is output as an output voltage V out from the second operational amplifier 16B with the same waveform.
  • AD converter 17A is AD conversion of the differential input, converts the voltage difference between the output voltage V out of the output voltage V out and the second operational amplifier 16B of the second operational amplifier 16A into a digital signal.
  • 1,1A, 1B non-contact voltage observation device 2,2A, 2B cable, 2a cable conductor, 2b cable coating, 3 AC power supply, 10,10A, 10B probe electrode, 11,11A, 11B probe cable, 12,12A sensor Circuit, 13, 13A, 13B phase compensation circuit, 14, 14A, 14B, 14C impedance circuit, 15, 15A first operational amplifier, 16, 16A, 16B second operational amplifier, 17, 17A AD converter, 141 first Capacitor element, 142 first inductor element, 143 first resistance element, 144 second resistance element, 145 third resistance element, 146 second capacitor element, 161 first capacitor element.

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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 comprend une électrode de sonde (10), un circuit d'impédance (14) qui est connecté à l'électrode de sonde (10) au niveau d'une extrémité d'entrée et qui simule l'impédance complexe d'un conducteur de câble (2a) à l'extrémité d'entrée, et un premier amplificateur opérationnel (15) qui est connecté à la masse au niveau d'une borne d'entrée d'électrode positive, est connecté à l'extrémité d'entrée du circuit d'impédance (14) au niveau d'une borne d'entrée d'électrode négative, et délivre en sortie une tension alternative dont la phase opposée de la tension alternative a été appliquée au conducteur de câble (2a).
PCT/JP2019/043894 2019-11-08 2019-11-08 Dispositif d'observation de tension sans contact WO2021090478A1 (fr)

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PCT/JP2019/043894 WO2021090478A1 (fr) 2019-11-08 2019-11-08 Dispositif d'observation de tension sans contact
JP2021554536A JP7003338B2 (ja) 2019-11-08 2019-11-08 非接触電圧観測装置

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Cited By (2)

* 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
JP7205000B1 (ja) * 2021-12-27 2023-01-16 三菱電機株式会社 非接触電圧センサ装置

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Publication number Priority date Publication date Assignee Title
JPS6415669A (en) * 1987-07-10 1989-01-19 Nippon Telegraph & Telephone Noise terminal voltage probe circuit of communication apparatus
JP2018132346A (ja) * 2017-02-14 2018-08-23 日置電機株式会社 電圧検出装置
US20190081601A1 (en) * 2017-09-08 2019-03-14 Analog Devices Global Unlimited Company Method of and Apparatus for Reducing the Influence of a Common Mode Signal on a Differential Signal and to Systems including such an Apparatus
JP2019174129A (ja) * 2018-03-26 2019-10-10 株式会社関電工 絶縁型電圧測定装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5313033B2 (ja) * 2009-04-30 2013-10-09 日置電機株式会社 電圧検出装置および線間電圧検出装置
CN108020573B (zh) 2016-10-31 2019-12-17 清华大学 区分碳纳米管类型的方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6415669A (en) * 1987-07-10 1989-01-19 Nippon Telegraph & Telephone Noise terminal voltage probe circuit of communication apparatus
JP2018132346A (ja) * 2017-02-14 2018-08-23 日置電機株式会社 電圧検出装置
US20190081601A1 (en) * 2017-09-08 2019-03-14 Analog Devices Global Unlimited Company Method of and Apparatus for Reducing the Influence of a Common Mode Signal on a Differential Signal and to Systems including such an Apparatus
JP2019174129A (ja) * 2018-03-26 2019-10-10 株式会社関電工 絶縁型電圧測定装置

Cited By (3)

* 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
JP7205000B1 (ja) * 2021-12-27 2023-01-16 三菱電機株式会社 非接触電圧センサ装置
WO2023126991A1 (fr) * 2021-12-27 2023-07-06 三菱電機株式会社 Dispositif capteur de tension sans contact

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