JPH11248767A - Apparatus for measuring grounding resistance and method for measuring grounding resistance using the apparatus - Google Patents
Apparatus for measuring grounding resistance and method for measuring grounding resistance using the apparatusInfo
- Publication number
- JPH11248767A JPH11248767A JP10051995A JP5199598A JPH11248767A JP H11248767 A JPH11248767 A JP H11248767A JP 10051995 A JP10051995 A JP 10051995A JP 5199598 A JP5199598 A JP 5199598A JP H11248767 A JPH11248767 A JP H11248767A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- measuring
- impedance
- electrode
- metal plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、接地抵抗測定装置
及びこれを用いた接地抵抗測定方法の改良に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground resistance measuring device and an improved ground resistance measuring method using the same.
【０００２】[0002]
【従来の技術】図１は従来の接地抵抗の測定のようすを
示すもので、図中、１は周波数固定の発振器２を備えた
接地抵抗計、３はリード線４を介して接地抵抗計１の被
測定接地端子Ｅに接続された接地電極、５はリード線６
を介して接地抵抗計１の電位端子Ｐに接続された補助電
極、７はリード線８を介して接地抵抗計１の電流端子Ｃ
に接続された補助電極である。2. Description of the Related Art FIG. 1 shows a conventional method for measuring a ground resistance. In FIG. 1, reference numeral 1 denotes a ground resistance meter having a fixed frequency oscillator 2; A ground electrode connected to the ground terminal E to be measured, and a lead wire 6
, An auxiliary electrode 7 connected to the potential terminal P of the earth resistance meter 1 via a lead wire 8 and a current terminal C
The auxiliary electrode is connected to
【０００３】接地抵抗の測定は、接地電極３から５０ｍ
〜１００ｍ程度離れた地点の大地に補助電極５，７を打
ち込み、端子Ｅ−Ｃ間（電極３−７間）に発振器２より
電流Ｉを印加し、この時の接地電極３及び補助電極５間
の電圧ＶEPと電流Ｉとの比から接地抵抗を求めるもので
あった。[0003] The measurement of the ground resistance is performed 50 m from the ground electrode 3.
The auxiliary electrodes 5 and 7 are driven into the ground at a distance of about 100 m, and a current I is applied from the oscillator 2 between the terminals E and C (between the electrodes 3 and 7), and between the ground electrode 3 and the auxiliary electrode 5 at this time. From the ratio of the voltage V EP to the current I.
【０００４】[0004]
【発明が解決しようとする課題】しかし、前述した従来
の方法では、接地電極以外に２つの補助電極を遠方に打
ち込まなければならず、広い場所が必要となり、都市部
や高層ビル内では補助電極の打ち込み場所を確保するこ
とが困難であるという問題があった。また、接地抵抗は
補助電極の接地抵抗や設置位置に影響されるという問題
があった。However, in the above-mentioned conventional method, two auxiliary electrodes other than the ground electrode must be driven far away, requiring a large space, and in a city or a high-rise building, the auxiliary electrode is required. However, there is a problem that it is difficult to secure a place for driving. Further, there is a problem that the ground resistance is affected by the ground resistance and the installation position of the auxiliary electrode.
【０００５】本発明の目的は、補助電極を用いることな
く、容易に接地抵抗を測定できる接地抵抗測定装置及び
これを用いた接地抵抗測定方法を提供することにある。It is an object of the present invention to provide a ground resistance measuring device and a ground resistance measuring method using the same, which can easily measure the ground resistance without using an auxiliary electrode.
【０００６】[0006]
【課題を解決するための手段】前記課題を解決するた
め、本発明では、一対の測定端子間のインピーダンスを
周波数を変えて測定可能なインピーダンス測定器と、接
地電極を前記測定器の一方の測定端子に接続する第１の
リード線と、大地から絶縁された金属板と、該金属板を
前記測定器の他方の測定端子に接続する第２のリード線
とからなる接地抵抗測定装置を用いて、この接地抵抗測
定装置の第１のリード線を大地に埋設された接地電極に
接続するとともに金属板を大地の上に絶縁して配置し、
接地電極と金属板とを含むループのインピーダンスを周
波数を変化させながら測定し、周波数共振点でのインピ
ーダンスから接地抵抗を求めることにより、補助電極を
用いることなく、容易に接地抵抗を測定することができ
る。In order to solve the above-mentioned problems, according to the present invention, there is provided an impedance measuring instrument capable of measuring the impedance between a pair of measuring terminals by changing the frequency, and a ground electrode connected to one of the measuring instruments. Using a ground resistance measuring device including a first lead wire connected to a terminal, a metal plate insulated from the ground, and a second lead wire connecting the metal plate to the other measurement terminal of the measuring device. Connecting a first lead wire of the ground resistance measuring device to a ground electrode buried in the ground, and disposing a metal plate insulated on the ground,
By measuring the impedance of the loop including the ground electrode and the metal plate while changing the frequency, and determining the ground resistance from the impedance at the frequency resonance point, the ground resistance can be easily measured without using an auxiliary electrode. it can.
【０００７】[0007]
【発明の実施の形態】図２は本発明の接地抵抗測定装置
の実施の形態の一例を示すもので、図中、１０はインピ
ーダンス測定器、２１は接地電極、２２は金属板、２３
は絶縁体、２４，２５は第１，第２のリード線である。FIG. 2 shows an embodiment of a ground resistance measuring apparatus according to the present invention. In FIG. 2, reference numeral 10 denotes an impedance measuring instrument, 21 denotes a ground electrode, 22 denotes a metal plate, and 23 denotes a ground electrode.
Is an insulator, and 24 and 25 are first and second lead wires.
【０００８】インピーダンス測定器１０は一対の測定端
子１１，１２を備え、該端子１１，１２間のインピーダ
ンスを周波数を変えて測定可能となっている。接地電極
２１はリード線２４を介して測定器１０の測定端子１１
に接続され、金属板２２はリード線２５を介して測定器
１０の測定端子１２に接続されている。また、接地電極
２１は大地に埋設され、金属板２２は絶縁体２３を介し
て大地の上に配置される。The impedance measuring device 10 has a pair of measuring terminals 11 and 12, and can measure the impedance between the terminals 11 and 12 by changing the frequency. The ground electrode 21 is connected to the measuring terminal 11 of the measuring instrument 10 via a lead wire 24.
, And the metal plate 22 is connected to the measuring terminal 12 of the measuring instrument 10 via the lead wire 25. The ground electrode 21 is buried in the ground, and the metal plate 22 is disposed on the ground via an insulator 23.
【０００９】図３は図２の接地抵抗測定装置の電気的な
等価回路を示すものである。同図において、Ｒｇは接地
電極２１の接地抵抗、Ｌ及びｒはリード線２４，２５の
インダクタンス成分及び抵抗成分、Ｒ及びＣは大地から
絶縁された金属板２２の接地抵抗及び静電容量である。FIG. 3 shows an electrical equivalent circuit of the ground resistance measuring device of FIG. In the figure, Rg is the ground resistance of the ground electrode 21, L and r are the inductance and resistance components of the lead wires 24 and 25, and R and C are the ground resistance and capacitance of the metal plate 22 insulated from the ground. .
【００１０】この時、等価回路におけるループのインピ
ーダンスＺｍは Ｚｍ＝Ｒｍ＋Ｉｍ ……（１） と表される。但し、Ｒｍは実数部、Ｉｍは虚数部であ
り、それぞれ Ｒｍ＝Ｒｇ＋Ｒ／｛１＋（ωＣＲ）2 ｝ ……（２） Ｉｍ＝ｊωＬ−ｊωＣＲ2 ／｛１＋（ωＣＲ）2 ｝ ……（３） と表される。At this time, the impedance Zm of the loop in the equivalent circuit is expressed as follows: Zm = Rm + Im (1) However, Rm is the real part, Im is the imaginary part, respectively Rm = Rg + R / {1+ (ωCR) 2} ...... (2) Im = jωL-jωCR 2 / {1+ (ωCR) 2} ...... (3) It is expressed as
【００１１】周波数共振点ではＩｍ＝０となるため、
（３）式は、 Ｌ＝ＣＲ2 ／｛１＋（ωＣＲ）2 ｝ ……（４） となる。Since Im = 0 at the frequency resonance point,
The expression (3) is as follows: L = CR 2 / {1+ (ωCR) 2 } (4)
【００１２】ここで、得られた式を変形すると、 Ｒ／｛１＋（ωＣＲ）2 ｝＝Ｌ／ＣＲ ……（５） を得る。Here, by transforming the obtained equation, the following equation is obtained: R / {1+ (ωCR) 2 } = L / CR (5)
【００１３】（５）式は、（２）式の右辺第二項と同一
である。この時、ＣＲ≫Ｌとすることにより、 Ｒｍ≒Ｒｇ ……（６） となる。Equation (5) is the same as the second term on the right side of equation (2). At this time, by setting CR≫L, Rm ≒ Rg (6).
【００１４】この結果、ＣＲ≫Ｌの条件はあるが、周波
数共振点（Ｉｍ＝０）における実数部Ｒｍの測定値よ
り、接地抵抗値Ｒｇを求めることができる。As a result, the ground resistance value Rg can be obtained from the measured value of the real part Rm at the frequency resonance point (Im = 0) under the condition of CR 条件 L.
【００１５】図４は図２の装置における測定例を示すも
のである。同図において、Ｉｍ＝０の部分の周波数にお
いて、本装置による接地抵抗値と従来の接地抵抗計によ
る接地抵抗値との偏差は小さく、良好な測定結果が得ら
れていることが分かる。FIG. 4 shows a measurement example in the apparatus of FIG. In the figure, at the frequency of the portion where Im = 0, the deviation between the ground resistance value by the present apparatus and the ground resistance value by the conventional ground resistance meter is small, and it can be seen that good measurement results are obtained.
【００１６】[0016]
【発明の効果】以上述べたように、本発明によれば、補
助電極を用いる必要がないため、容易に接地抵抗を測定
することができる。As described above, according to the present invention, since it is not necessary to use an auxiliary electrode, the ground resistance can be easily measured.
【図１】従来の接地抵抗の測定のようすを示す構成図FIG. 1 is a configuration diagram showing a state of measurement of a conventional ground resistance.
【図２】本発明の接地抵抗測定装置の実施の形態の一例
を示す構成図FIG. 2 is a configuration diagram showing an example of an embodiment of a grounding resistance measuring device according to the present invention.
【図３】図２の装置の電気的な等価回路を示す図3 shows an electrical equivalent circuit of the device of FIG.
【図４】図２の装置における測定例を示す図FIG. 4 is a diagram showing a measurement example in the apparatus of FIG. 2;
１０：インピーダンス測定器、１１，１２：測定端子、
２１：接地電極、２２：金属板、２３：絶縁体、２４，
２５：リード線。10: impedance measuring instrument, 11, 12: measuring terminal,
21: ground electrode, 22: metal plate, 23: insulator, 24,
25: Lead wire.
Claims (2)
波数を変えて測定可能なインピーダンス測定器と、 接地電極を前記測定器の一方の測定端子に接続する第１
のリード線と、 大地から絶縁された金属板と、 該金属板を前記測定器の他方の測定端子に接続する第２
のリード線とからなることを特徴とする接地抵抗測定装
置。An impedance measuring device capable of measuring the impedance between a pair of measuring terminals by changing the frequency, and a first electrode for connecting a ground electrode to one measuring terminal of the measuring device.
A metal plate insulated from the ground, and a second connecting the metal plate to the other measuring terminal of the measuring instrument.
And a ground wire measuring device.
のリード線を大地に埋設された接地電極に接続するとと
もに金属板を大地の上に絶縁して配置し、 接地電極と金属板とを含むループのインピーダンスを周
波数を変化させながら測定し、 周波数共振点でのインピーダンスから接地抵抗を求める
ことを特徴とする接地抵抗測定方法。2. The first of the ground resistance measuring apparatus according to claim 1,
Is connected to the ground electrode buried in the ground, and the metal plate is insulated on the ground.The impedance of the loop including the ground electrode and the metal plate is measured while changing the frequency, and the frequency resonance is measured. A ground resistance measuring method, wherein a ground resistance is obtained from an impedance at a point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10051995A JP2935229B1 (en) | 1998-03-04 | 1998-03-04 | Earth resistance measuring apparatus and earth resistance measuring method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10051995A JP2935229B1 (en) | 1998-03-04 | 1998-03-04 | Earth resistance measuring apparatus and earth resistance measuring method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2935229B1 JP2935229B1 (en) | 1999-08-16 |
| JPH11248767A true JPH11248767A (en) | 1999-09-17 |
Family
ID=12902445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10051995A Expired - Fee Related JP2935229B1 (en) | 1998-03-04 | 1998-03-04 | Earth resistance measuring apparatus and earth resistance measuring method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2935229B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100385072B1 (en) * | 2000-12-21 | 2003-05-22 | 삼성전기주식회사 | Resonant frequency check system for multifunction actuator |
| KR100627975B1 (en) | 2004-11-19 | 2006-09-26 | 학교법인 성균관대학 | Resonanat Frequency Checking System For Magnetic Actuator And Method Thereof |
| GB2449285A (en) * | 2007-05-17 | 2008-11-19 | Newson Gale Ltd | Testing an earth connection |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005015262A1 (en) | 2003-07-16 | 2005-02-17 | Canon Kabushiki Kaisha | Ground survey device, system, and method |
-
1998
- 1998-03-04 JP JP10051995A patent/JP2935229B1/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100385072B1 (en) * | 2000-12-21 | 2003-05-22 | 삼성전기주식회사 | Resonant frequency check system for multifunction actuator |
| KR100627975B1 (en) | 2004-11-19 | 2006-09-26 | 학교법인 성균관대학 | Resonanat Frequency Checking System For Magnetic Actuator And Method Thereof |
| GB2449285A (en) * | 2007-05-17 | 2008-11-19 | Newson Gale Ltd | Testing an earth connection |
| GB2449285B (en) * | 2007-05-17 | 2010-08-11 | Newson Gale Ltd | Improvements relating to the testing of an earth connection |
| US8476913B2 (en) | 2007-05-17 | 2013-07-02 | Newson Gale Limited | Improvements relating to the testing of an earth connection |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2935229B1 (en) | 1999-08-16 |
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