WO2023112491A1 - Système de mesure de résistance de masse et procédé de mesure de résistance de masse - Google Patents

Système de mesure de résistance de masse et procédé de mesure de résistance de masse Download PDF

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Publication number
WO2023112491A1
WO2023112491A1 PCT/JP2022/039630 JP2022039630W WO2023112491A1 WO 2023112491 A1 WO2023112491 A1 WO 2023112491A1 JP 2022039630 W JP2022039630 W JP 2022039630W WO 2023112491 A1 WO2023112491 A1 WO 2023112491A1
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WIPO (PCT)
Prior art keywords
ground resistance
ground
current
measured
measuring device
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Application number
PCT/JP2022/039630
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English (en)
Japanese (ja)
Inventor
昭彦 三木
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日置電機株式会社
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Filing date
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Application filed by 日置電機株式会社 filed Critical 日置電機株式会社
Publication of WO2023112491A1 publication Critical patent/WO2023112491A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30—Assessment of water resources

Definitions

  • the present invention relates to a ground resistance measurement system and a ground resistance measurement method.
  • Grounding work for electrical equipment is essential for human safety and equipment maintenance.
  • a ground resistance measurement system is used to measure the ground resistance of a ground electrode to be measured buried in the ground (for example, Patent Document 1).
  • the earth electrode to be measured is grounded using the first auxiliary earth electrode and the second auxiliary earth electrode connected to the connection cable. Resistance is repeatedly measured by the three-electrode method.
  • connection cables 115, 117 and 119 are connected to the ground electrode 109 to be measured, the first auxiliary earth electrode 111 and the second auxiliary earth electrode 113 (ground resistance X5), respectively.
  • the other ends of cable 117 and connection cable 119 are connected to E terminal, P terminal, and C terminal of earth resistance measuring device 103 .
  • a clamp meter 105 having a current detection unit (clamp sensor functioning as a current sensor) 126 is attached to the ground electrode 109 under measurement, and data on the current of the ground electrode 109 under measurement is obtained.
  • the connection cable 116 is for connecting to another ground electrode to be measured (not shown). In the example of FIG. It is connected to the.
  • the ground resistance measuring device 103 has a signal generator 122 and a voltage detector 124 as shown in FIG.
  • the signal generator 122 generates an AC voltage (eg, a sine wave voltage) with a predetermined amplitude and outputs it toward the ground electrode 109 under test.
  • the current detector 126 measures the current value of the alternating current flowing through the current path (measurement loop) including the signal generator 122 , the ground electrode under test 109 and the second auxiliary ground electrode 113 .
  • Voltage detector 124 measures the voltage between measured ground electrode 109 and first auxiliary ground electrode 111 .
  • the ground resistance X1 of the ground electrode 109 to be measured is calculated based on the voltage obtained by the voltage detection section 124 and the current obtained by the current detection section 126 .
  • the complex components of the voltage and current are obtained, and the ground resistance of the complex number is calculated.
  • the ground resistance measurement device 103 and the clamp meter 105 are connected by a wire, and the current detection unit in the ground resistance measurement device 103 is used for current measurement. It must be a dedicated device that meets the specifications (measurement range, etc.).
  • An object of the present invention is to provide a ground resistance measurement system and a ground resistance measurement method that can use a general-purpose clamp sensor as the clamp sensor connected to the ground resistance measurement device.
  • one aspect of the earth resistance measuring system includes an earth resistance measuring device for measuring the earth resistance of the earth electrode to be measured, and a clamp sensor for measuring the current of the earth electrode to be measured.
  • the clamp sensor outputs current data to the ground resistance measuring device by wireless communication, and the ground resistance measuring device calculates the ground resistance of the ground electrode to be measured based on the current data.
  • the ground resistance measuring device is configured to measure the ground electrode under test and the ground electrode under test based on the first voltage applied from the signal generator to the ground electrode under test. a voltage detector that detects a second voltage between the auxiliary earth electrode adjacent to the earth electrode; and a current detector that detects a current flowing through a current path from the signal generator to the measured earth electrode, The ground resistance measuring device obtains the phase difference between the current measured by the current detection unit and the second voltage, and calculates the ground resistance based on the current value and the phase difference of the current output from the clamp sensor. characterized by
  • Another aspect of the ground resistance measurement system according to the present invention is characterized in that the clamp sensor is provided with a display section for displaying the calculated ground resistance.
  • ground resistance measuring system has a mobile terminal connected to the ground resistance measuring device and the clamp sensor by wireless communication via a network, and the mobile terminal is measured by the current detector. Based on the current and the second voltage, the phase difference between them is obtained, and the ground resistance is calculated and displayed based on the current value and the phase difference of the current output from the clamp sensor.
  • one aspect of the earth resistance measuring method includes the steps of measuring the earth resistance of the earth electrode to be measured by the earth resistance measuring device, and measuring the current of the earth electrode to be measured by the clamp sensor. a step of the clamp sensor outputting current data to a ground resistance measuring device by wireless communication; and a step of the ground resistance measuring device calculating the ground resistance of the ground electrode to be measured based on the current data. .
  • a general-purpose clamp sensor can be used as the clamp sensor connected to the ground resistance measuring device.
  • FIG. 1 is a diagram showing the configuration of a ground resistance measurement system according to one embodiment of the present invention
  • FIG. It is a figure for demonstrating the operation
  • 1 is a diagram showing a configuration of a conventional ground resistance measurement system
  • FIG. 10 is a diagram for explaining the operation of a conventional ground resistance measurement system;
  • FIG. 1 A ground resistance measuring system according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
  • FIG. 1 A ground resistance measuring system according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
  • FIG. 1 is a diagram showing the configuration of a ground resistance measurement system according to one embodiment of the present invention.
  • FIG. 2 is a diagram for explaining the operation of the ground resistance measuring system according to one embodiment of the present invention.
  • a ground resistance measuring system 1 includes a ground resistance measuring device 3 and a clamp meter 5 .
  • a clamp sensor provided with a display unit is called a clamp meter.
  • the effects of the ground resistance measurement system according to this embodiment, which will be described later, can be obtained.
  • the reason for this is that the display unit for displaying the ground resistance is also provided in the ground resistance measuring device 3 as described later, and the display unit of the mobile terminal separately displays the ground resistance as described in the modified example described later. Because you can.
  • Data transmission/reception between the ground resistance measuring device 3 and the clamp meter 5 is performed by wireless communication (eg, Wi-Fi (registered trademark), Bluetooth (registered trademark), etc.).
  • the portable terminal 7 has a function of wirelessly communicating various data (for example, Wi-Fi (registered trademark), Bluetooth (registered trademark), etc.) with the ground resistance measuring device 3 and the clamp meter 5.
  • various data for example, Wi-Fi (registered trademark), Bluetooth (registered trademark), etc.
  • a ground electrode 9 to be measured, a first auxiliary earth electrode 11 functioning as a potential electrode, and a second auxiliary earth electrode 13 functioning as a current electrode are driven into the ground 30 .
  • connection cables 15, 17 and 19 are connected to the ground electrode 9 to be measured, the first auxiliary earth electrode 11 and the second auxiliary earth electrode 13, respectively.
  • the other end of each connection cable 19 is connected to each of the E terminal, P terminal, and C terminal of the ground resistance measuring device 3 .
  • the ground resistance measuring device 3 has a signal generation section (voltage generation circuit) 20, a current detection section 22, a voltage detection section 24, a control section 10, a storage section 12 and a display section 14, as shown in FIG.
  • the signal generator 20 generates and outputs an AC voltage (sine wave voltage as an example) having a predetermined amplitude.
  • the current detection unit 22 has one end connected to the signal generation unit 20 and the other end connected to the ground electrode 9 to be measured. output to Here, the current It is a current flowing through a current path (current measurement loop) including the ground electrode 9 to be measured and the second auxiliary ground electrode 13 .
  • the voltage detection unit 24 receives a detection instruction from the control unit 10 and detects the voltage V (voltage drop) between the ground electrode 9 to be measured and the first auxiliary ground electrode 11 .
  • the control unit 10 includes, for example, a computing element such as a CPU and an internal memory. Based on the measured current value supplied from and the measured voltage value supplied from the voltage detection unit 24, ground resistance measurement processing, which will be described later, is executed.
  • the storage unit 12 is composed of, for example, a semiconductor memory or a hard disk, and stores in advance an operation program or the like executed by an arithmetic element of the control unit 10 such as a CPU.
  • the display unit 14 is composed of a display device such as an LCD (Liquid Crystal Display), for example, and displays the results of each process executed by the control unit 10 on the screen.
  • LCD Liquid Crystal Display
  • the clamp meter 5 has a current detection section 26, and the current detection section 26 detects the current value of the current Ic flowing through the measured ground electrode 9 by wireless connection (Ic in Equation (1), which will be described later, means this current value). is detected, and information on the detected current value Ic is output to the control unit 10 .
  • the controller 10 controls the signal generator 20 to apply a predetermined first voltage between the ground electrode 9 to be measured and the second auxiliary ground electrode 13 .
  • a calculation unit (not shown) constituting the control unit 10 detects the voltage between the measured ground electrode 9 and the first auxiliary ground electrode 11 calculated by the voltage detection unit 24 based on the applied predetermined first voltage. and the current It obtained by the current detector 26, the phase difference ⁇ between the voltage and the current is calculated.
  • the amplitude of the voltage can be expressed as V cos ⁇ based on the current phase.
  • the current detection unit 26 mounted on the clamp meter 5 detects the current value (Ic) of the current Ic flowing through the ground resistance X1 of the measured ground electrode 9, and controls the current value (Ic) of the detected current Ic. output to the unit 10; Since the ground resistance X1 of the ground electrode 9 to be measured is one of the multiple grounded ground electrode resistances (X1, X2, and X3 in the example of FIG. 2), It ⁇ Ic, but It and Ic are in phase.
  • the ground resistance Rx1 calculated by the computing section (not shown) constituting the ground resistance measuring device 3 is displayed on the display section 14 of the ground resistance measuring device 3.
  • the clamp meter 5 is a dedicated device that can be connected to the ground resistance measurement device 3. It doesn't have to be. In other words, conventionally, the selection of a clamp meter was limited to those that can be wired to the ground resistance measuring device 3, and the degree of freedom of selection was low.
  • the clamp meter 5 to be selected is not limited to a dedicated device that can be connected to the earth resistance measuring device 3, so the degree of freedom in selecting the clamp meter 5 is improved.
  • the ground resistance measuring device 3 side obtains the phase difference ⁇ between the detected voltage V and the detected current It, the ground resistance can be obtained regardless of the phase characteristics on the clamp meter side. In addition, even when a current based on noise (eddy current, etc.) caused by an external factor is flowing, the noise can be canceled by executing the zero adjustment function of the clamp meter 5, thereby improving the accuracy of ground resistance measurement. .
  • the calculation of the ground resistance Rx1 is performed by the calculation section constituting the control section 10 of the ground resistance measurement device 3, and the calculation result is displayed on the display section 14 of the ground resistance measurement device 3.
  • a calculation unit (not shown) may be provided in the clamp meter 5 to calculate the ground resistance Rx1, or a calculation unit (not shown) may be provided in the portable terminal 7 (see FIG. 1). may be provided and the ground resistance Rx1 may be calculated there.
  • the calculation result may also be displayed on the display section 6 of the clamp meter 5 or may be displayed on the display section 8 of the portable terminal 7 (see FIG. 1).
  • the calculation result can be confirmed in a place other than the display unit 14 of the ground resistance measuring device 3, so the calculation result can be quickly confirmed regardless of the confirmation place, and the measurement process can be performed efficiently. can be done.
  • a ground resistance measuring system 1 includes a ground resistance measuring device 3 that measures the ground resistance Rx1 of the ground electrode 9 to be measured, and a clamp sensor that measures the current of the ground electrode 9 to be measured.
  • the sensor outputs current data to the ground resistance measuring device 3 by wireless communication, and the ground resistance measuring device 3 calculates the ground resistance Rx1 of the ground electrode 9 to be measured based on the current data. Therefore, according to the above configuration, since the current value Ic detected by the current detection unit 26 of the clamp sensor (clamp meter 5 (clamp sensor with a display unit)) is used for calculation, the clamp sensor is the ground resistance measuring device 3 It does not have to be a dedicated device that can be connected to
  • the ground resistance measuring device 3 measures the ground electrode 9 to be measured and the ground electrode 9 to be measured based on the first voltage applied from the signal generator 20 to the ground electrode 9 to be measured.
  • a voltage detector 24 for detecting a second voltage V between the auxiliary earth electrode (first auxiliary earth electrode) 11 adjacent to the measurement earth electrode 9 and a current path from the signal generator 20 to the measured earth electrode 9 The ground resistance measuring device 3 obtains a phase difference ⁇ based on the current It measured by the current detection unit 22 and the second voltage V, A ground resistance Rx1 is calculated based on the current value Ic of the current output from the clamp sensor and the phase difference ⁇ .
  • the ground resistance Rx1 is calculated based on the current value Ic detected by the current detection unit 26 of the clamp sensor (clamp meter 5 (clamp sensor with display unit)) and the phase difference ⁇ . Therefore, the ground resistance Rx1 can be obtained without depending on the phase characteristics of the clamp sensor.
  • the clamp sensor is provided with the display unit 6 for displaying the calculated ground resistance. Since it can be displayed on the display section 6 provided in the (clamp meter 5 (clamp sensor with a display section)), it is possible to quickly confirm the calculation result.
  • the ground resistance measuring system 1 has a mobile terminal 7 connected to the ground resistance measuring device 3 and the clamp sensor by wireless communication via a network. Based on the current It and the second voltage V, the phase difference between them is calculated, and the ground resistance Rx1 is calculated and displayed based on the current value Ic and the phase difference ⁇ of the current output from the clamp sensor. According to this, since the calculation result can be confirmed at a place other than the display unit 14 of the ground resistance measuring device 3, the calculation result can be quickly confirmed regardless of the confirmation place, and the measurement process can be performed efficiently.
  • the ground resistance measuring method includes the steps of measuring the ground resistance Rx1 of the ground electrode to be measured by the ground resistance measuring device 3, and measuring the current of the ground electrode to be measured by the clamp sensor,
  • the clamp sensor has a step of outputting current data to the earth resistance measuring device 3 by wireless communication, and a step of the earth resistance measuring device 3 calculating the earth resistance Rx1 of the earth electrode to be measured based on the current data. Therefore, according to the above configuration, since the current value Ic detected by the current detection unit 26 of the clamp sensor (clamp meter 5 (clamp sensor with a display unit)) is used for calculation, the clamp sensor is the ground resistance measuring device 3 It does not have to be a dedicated device that can be connected to
  • Earth resistance measurement system 3 Earth resistance measurement device 4 Clamp meter (clamp sensor with display) 6 display unit 7 portable terminal 8 display unit 9 ground electrode to be measured 10 control unit 11 first auxiliary earth electrode 12 storage unit 13 second auxiliary earth electrode 14 display unit 15, 17, 19 connection cable 20 signal generation unit (voltage generation circuit ) 22 current detector 24 voltage detector 30 ground

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

La présente invention permet d'utiliser un capteur à pince générique en tant que capteur à pince connecté à un dispositif de mesure de résistance de masse.　Un système de mesure de résistance de masse (1) comprend : un dispositif de mesure de résistance de masse (3) qui mesure la résistance de masse d'un pôle de masse (9) mesuré ; et un capteur à pince qui mesure le courant au niveau du pôle de masse (9) mesuré. Le capteur à pince émet en sortie des données de courant au dispositif de mesure de résistance de masse (3) par l'intermédiaire d'une communication sans fil, et le dispositif de mesure de résistance de masse (3) calcule la résistance de masse du pôle de masse (9) mesuré en fonction des données de courant. Étant donné que la valeur de courant détectée par le capteur à pince est utilisée pour le calcul, le capteur à pince n'a pas besoin d'être un appareil dédié qui peut être connecté au dispositif de mesure de résistance de masse (3).
PCT/JP2022/039630 2021-12-16 2022-10-25 Système de mesure de résistance de masse et procédé de mesure de résistance de masse WO2023112491A1 (fr)

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JP2021204604A JP2023089848A (ja) 2021-12-16 2021-12-16 接地抵抗測定システムおよび接地抵抗測定方法
JP2021-204604 2021-12-16

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WO2023112491A1 true WO2023112491A1 (fr) 2023-06-22

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH112650A (ja) * 1997-06-13 1999-01-06 Nippon Telegr & Teleph Corp <Ntt> 接地抵抗測定装置およびその測定方法
JPH11118851A (ja) * 1997-10-08 1999-04-30 Hioki Ee Corp 接地抵抗計
JP2000304788A (ja) * 1999-04-21 2000-11-02 Nippon Telegraph & Telephone East Corp 信号電圧比を用いた接地抵抗測定装置及び接地抵抗測定方法
JP2011112652A (ja) * 2009-11-24 2011-06-09 Fluke Corp 単一のクランプを使用して鉄塔のアース接地抵抗を測定する方法
JP2011123059A (ja) * 2009-11-24 2011-06-23 Fluke Corp 遠隔操作を用いた接地抵抗測定装置
JP2012026896A (ja) * 2010-07-26 2012-02-09 Hioki Ee Corp 接地抵抗計および接地抵抗測定方法
JP2014119277A (ja) * 2012-12-13 2014-06-30 Hioki Ee Corp 接地抵抗計および接地抵抗測定方法、ならびにプログラム

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH112650A (ja) * 1997-06-13 1999-01-06 Nippon Telegr & Teleph Corp <Ntt> 接地抵抗測定装置およびその測定方法
JPH11118851A (ja) * 1997-10-08 1999-04-30 Hioki Ee Corp 接地抵抗計
JP2000304788A (ja) * 1999-04-21 2000-11-02 Nippon Telegraph & Telephone East Corp 信号電圧比を用いた接地抵抗測定装置及び接地抵抗測定方法
JP2011112652A (ja) * 2009-11-24 2011-06-09 Fluke Corp 単一のクランプを使用して鉄塔のアース接地抵抗を測定する方法
JP2011123059A (ja) * 2009-11-24 2011-06-23 Fluke Corp 遠隔操作を用いた接地抵抗測定装置
JP2012026896A (ja) * 2010-07-26 2012-02-09 Hioki Ee Corp 接地抵抗計および接地抵抗測定方法
JP2014119277A (ja) * 2012-12-13 2014-06-30 Hioki Ee Corp 接地抵抗計および接地抵抗測定方法、ならびにプログラム

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