JP2883087B2 - Earth resistivity measuring device - Google Patents
Earth resistivity measuring deviceInfo
- Publication number
- JP2883087B2 JP2883087B2 JP21898388A JP21898388A JP2883087B2 JP 2883087 B2 JP2883087 B2 JP 2883087B2 JP 21898388 A JP21898388 A JP 21898388A JP 21898388 A JP21898388 A JP 21898388A JP 2883087 B2 JP2883087 B2 JP 2883087B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- electrodes
- ground
- resistivity
- measuring
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 （１） 発明の属する技術分野 本発明は、大地へ電流を注入するための棒状電極と接
地電位差を測定するための棒状電極を用いた大地抵抗率
測定装置に関するものである。Description: TECHNICAL FIELD The present invention relates to a ground resistivity measuring apparatus using a rod-shaped electrode for injecting a current to the ground and a rod-shaped electrode for measuring a ground potential difference. is there.
（２） 従来の技術とその問題点 大地抵抗率の測定には、通常第１図に示すWennerの電
極配置が用いられている。ここで、1,4は大地へ電流を
注入するための棒状電極で第２図に示す如き構成を有す
るもの、2,3は接地電位差Ｖを測定するための棒状電
極、５は大地抵抗率測定装置である。棒状電極1,2,3,4
を一直線上で等間隔ａで打ち込み、この電極間隔ａを順
次広げることによって、地表面からみた見掛け上の大地
抵抗ρを求めるものである。(2) Conventional technology and its problems In measuring the earth resistivity, the Wenner electrode arrangement shown in FIG. 1 is usually used. Here, reference numerals 1 and 4 denote rod electrodes for injecting a current into the ground, each having a configuration as shown in FIG. 2; Device. Rod electrodes 1, 2, 3, 4
Are implanted at equal intervals a on a straight line, and the apparent earth resistance ρ as viewed from the ground surface is obtained by sequentially increasing the electrode interval a.
第３図において、点電極から大地に電流Ｉを流したと
き、距離ｘにおける電位差Vxは以下で与えられる。In FIG. 3, when a current I flows from the point electrode to the ground, a potential difference Vx at a distance x is given as follows.
Vx＝ρI/2πｘ ……（１） 電極２および電極３間の電位差Ｖは、電極１及び電極
４が形成するものとして（１）式により与えられる電位
差 Ｖ＝ρI/2πａ ……（２） の重畳として求められ、大地抵抗率ρは ρ＝２πaR（Ｒ＝V/I） ……（３） で求めることができる。Vx = ρI / 2πx (1) The potential difference V between the electrode 2 and the electrode 3 is the potential difference V = ρI / 2πa (2) given by the equation (1) assuming that the electrode 1 and the electrode 4 form. It is obtained as a superposition, and the ground resistivity ρ can be obtained by ρ = 2πaR (R = V / I) (3)
しかし上述したように、Wennerの電極配置を用いて大
地抵抗率を測定する際、探針としては棒状電極を用いて
いるのにもかかわらず、接地抵抗の理論計算式（３）は
探針を点電極として求めている。従って、探針の棒状電
極を地表面下に深く打ち込んだ場合には測定誤差を生じ
るものと考えられるが、従来この測定誤差は知られてお
らず、補正の手段がないという欠点を有している。However, as described above, when measuring the ground resistivity using the Wenner electrode arrangement, the theoretical calculation formula (3) of the ground resistance is obtained by using the probe, although the rod-shaped electrode is used as the probe. It is required as a point electrode. Therefore, it is considered that a measurement error occurs when the rod-shaped electrode of the probe is deeply driven below the ground surface. However, this measurement error has not been known so far, and has a disadvantage that there is no correction means. I have.
（３） 発明の目的 本発明の目的は、この測定誤差の影響を自動的に補正
する機能を有する大地抵抗率測定装置を提供することに
ある。(3) Object of the Invention It is an object of the present invention to provide a ground resistivity measuring apparatus having a function of automatically correcting the influence of the measurement error.
（４） 発明の構成 （４−１）発明の特徴と従来の技術と差異 前記の目的を達成するために、本発明による大地抵抗
率測定装置は、大地の２点間に電流を流し込むための２
本の第１の電極と電流源と、該２点間に前記電流を流し
たときに該２点を通る直線に沿う他の２点間に生じる電
位差を測定するための２本の第２の電極と電圧計を有す
る大地抵抗率測定部と、前記２つの第１の電極と前記２
つの第２の電極の合計４本の電極の電極間隔を記憶する
第１の記憶部と、該４本の電極の相等しい電極間隔を変
化させた場合の前記大地抵抗率測定部による大地抵抗率
測定値を記憶する第２の記憶部と、前記４本の電極の電
極埋設深さによって生ずる前記大地抵抗率測定値の誤差
を除くために該電極埋設深さ及び前記電極間隔に基づい
て得られる補正係数に従って前記大地抵抗率測定値を補
正する機能を有した処理部とを備えた構成を有してい
る。(4) Configuration of the Invention (4-1) Features of the Invention and Differences from the Prior Art In order to achieve the above object, the earth resistivity measuring apparatus according to the present invention provides a device for flowing a current between two points on the earth. 2
A first electrode, a current source, and two second electrodes for measuring a potential difference generated between two other points along a straight line passing through the two points when the current flows between the two points; A ground resistivity measuring unit having an electrode and a voltmeter; the two first electrodes;
A first storage unit for storing the electrode spacing of a total of four electrodes of two second electrodes, and a ground resistivity by the ground resistivity measuring unit when the same electrode spacing of the four electrodes is changed A second storage unit for storing measured values, and a second storage unit for obtaining an error in the ground resistivity measurement value caused by the electrode burying depth of the four electrodes, based on the electrode burying depth and the electrode interval. A processing unit having a function of correcting the ground resistivity measurement value according to the correction coefficient.
本発明は、電極埋設深さによって生じる測定誤差を自
動的に補正する機能を有することを最も主要な特徴とす
る。The most important feature of the present invention is to have a function of automatically correcting a measurement error caused by an electrode burying depth.
（４−２）実施例 本発明の実施例を第４図に示す。1,2,3,4は棒状電
極、６は大地抵抗率計算部、７は相等しい電極間隔及び
大地抵抗率をそれぞれ記憶する第１の記憶部と第２の記
憶部とを備えた記憶部、８は処理部である。(4-2) Embodiment An embodiment of the present invention is shown in FIG. 1, 2, 3, and 4 are rod-shaped electrodes, 6 is a ground resistivity calculating unit, 7 is a storage unit including a first storage unit and a second storage unit that store the same electrode spacing and ground resistivity, respectively. , 8 are processing units.
1,2,3,4の棒状電極を、電極間隔ａによらず一定の埋
設長ｌで打ち込み、この時の電極間隔ａ及び大地抵抗率
測定値を記憶部７内の第１の記憶部と第２の記憶部にそ
れぞれ記録し、処理部８において、この記録した電極間
隔ａ及び大地抵抗率測定値を用いて以下の補正を行う。1, 2, 3, and 4 rod-shaped electrodes are driven at a constant buried length 1 irrespective of the electrode interval a, and the electrode interval a and the measured value of the ground resistivity at this time are stored in the first storage unit in the storage unit 7 The information is recorded in the second storage unit, and the processing unit 8 performs the following correction using the recorded electrode interval a and the measured ground resistivity.
この補正係数の算出方法について以下に述べる。 The method of calculating the correction coefficient will be described below.
（３）式の計算式は、電極が点電極であるとして求め
た式であるが、実際の大地抵抗率測定時には第２図に示
す棒状電極を用いているため、電極埋設長をｌであると
して、大地抵抗率ρの計算式を導く。The equation (3) is an equation obtained assuming that the electrode is a point electrode, but since the rod-shaped electrode shown in FIG. 2 is used at the time of actual earth resistivity measurement, the electrode burying length is l. Then, a calculation formula of the ground resistivity ρ is derived.
第２図において、棒電極から距離ｘにおける電位Vxは
次式で与えられる。In FIG. 2, the potential Vx at a distance x from the rod electrode is given by the following equation.
（４）式からP1〜P2間の電位差Ｖは、 となり、大地抵抗率ρは、 となる。従って、棒状電極を用いたにもかかわらず、
（３）式を用いて大地抵抗率の計算を行ったとすると、
下記に示す（６）式と（３）式の比δだけ大地抵抗率は
低く算出されることとなる。 From equation (4), the potential difference V between P 1 and P 2 is And the earth resistivity ρ is Becomes Therefore, despite the use of rod-shaped electrodes,
Assuming that the calculation of the ground resistivity is performed using the equation (3),
The ground resistivity is calculated to be lower by the ratio δ of the following equations (6) and (3).
（７）式の補正係数δを用いて、処理装置８において
大地抵抗率測定値を補正する。 The measured value of the ground resistivity is corrected in the processing device 8 using the correction coefficient δ in the equation (7).
本測定装置を用いて、均一な土壌を入れた土槽におい
て10分の１モデルによる実験を行った結果を第５図に示
す。第５図において、大地抵抗率測定値は、真の土壌の
抵抗率（平行平板間の電圧・電流測定結果から求めた測
定値）で規格化した値（百分率）を示している。従来技
術の測定方法において、実線で示すように電極打込み深
さが大きくなるに従ってまた電極間隔が小さくなるに従
って、測定値は真値に対して小さく測定されていること
が判る。これに対して、本発明による測定方法において
は、電極間隔と電極打ち込み深さに無関係に点線で示す
如く、真値と全く同じ値であることが判る。FIG. 5 shows the results of an experiment conducted with a 1/10 model in an earth tank containing uniform soil using the measurement apparatus. In FIG. 5, the measured value of the ground resistivity is a value (percentage) normalized by the resistivity of the true soil (measured value obtained from the voltage / current measurement results between parallel plates). In the measurement method of the prior art, as shown by the solid line, it can be seen that the measured value is smaller than the true value as the electrode implantation depth increases and the electrode interval decreases. On the other hand, in the measuring method according to the present invention, it is understood that the value is exactly the same as the true value as shown by the dotted line regardless of the electrode interval and the electrode implantation depth.
（５） 発明の効果 以上説明したように、本発明による大地抵抗率測定装
置及び測定方法を用いることにより、電極埋設長さによ
る測定誤差がないので、この測定値に基づき接地抵抗の
予測を行うことにより、予測値と接地施工後の抵抗値を
一致させることが可能となる。(5) Effect of the Invention As described above, since the earth resistivity measuring apparatus and the measuring method according to the present invention do not cause a measurement error due to the electrode burying length, the ground resistance is predicted based on the measured value. This makes it possible to match the predicted value with the resistance value after grounding.
第１図はWennerの電極配置を用いた大地抵抗率測定方法
を説明するための接続配置図、第２図は棒状電極と大地
抵抗率との関係を説明するための略図、第３図は点電極
と大地抵抗率との関係を説明するための略図、第４図は
本発明の実施例を示すブロック図、第５図は本発明装置
の測定例を示す特性図である。 1,4……電流注入用の棒状電極（第１の電極）、2,3……
接地電位差測定用の棒状電極（第２の電極）、５……大
地抵抗率測定装置、６……大地抵抗率測定部、７……記
憶部（第１の記憶部と第２の記憶部）、８……処理部。FIG. 1 is a connection arrangement diagram for explaining a ground resistivity measurement method using Wenner's electrode arrangement, FIG. 2 is a schematic diagram for explaining the relationship between a rod-shaped electrode and the ground resistivity, and FIG. FIG. 4 is a schematic diagram for explaining the relationship between the electrode and the ground resistivity, FIG. 4 is a block diagram showing an embodiment of the present invention, and FIG. 5 is a characteristic diagram showing a measurement example of the device of the present invention. 1,4 ... rod-shaped electrode (first electrode) for current injection, 2,3 ...
A rod-shaped electrode (second electrode) for measuring a ground potential difference, 5 ... ground resistivity measuring device, 6 ... ground resistivity measuring unit, 7 ... memory unit (first storage unit and second storage unit) , 8 ... Processing unit.
Claims (1)
の第１の電極と電流源と、 該２点間に前記電流を流したときに該２点を通る直線に
沿う他の２点間に生じる電位差を測定するための２本の
第２の電極と電圧計を有する大地抵抗率測定部と、 前記２つの第１の電極と前記２つの第２の電極の合計４
本の電極の相等しい電極間隔を記憶する第１の記憶部
と、 該４本の電極の電極間隔を変化させた場合の前記大地抵
抗率測定部による大地抵抗率測定値を記憶する第２の記
憶部と、 前記４本の電極の電極埋設深さによって生ずる前記大地
抵抗率測定値の誤差を除くために該電極埋設深さ及び前
記電極間隔に基づいて得られる補正係数に従って前記大
地抵抗率測定値を補正する機能を有した処理部と を備えた大地抵抗率測定装置。1. Two first electrodes and a current source for flowing a current between two points on the ground, and another current source along a straight line passing through the two points when the current flows between the two points. A ground resistivity measuring unit having two second electrodes and a voltmeter for measuring a potential difference generated between two points; a total of four of the two first electrodes and the two second electrodes;
A first storage unit for storing equal electrode intervals of the four electrodes; and a second storage unit for storing a ground resistivity measurement value by the ground resistivity measurement unit when the electrode spacing of the four electrodes is changed. A storage unit for measuring the earth resistivity according to a correction coefficient obtained based on the electrode embedding depth and the electrode interval to eliminate an error of the earth resistivity measurement value caused by the electrode embedding depth of the four electrodes; And a processing unit having a function of correcting a value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21898388A JP2883087B2 (en) | 1988-09-01 | 1988-09-01 | Earth resistivity measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21898388A JP2883087B2 (en) | 1988-09-01 | 1988-09-01 | Earth resistivity measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0266466A JPH0266466A (en) | 1990-03-06 |
| JP2883087B2 true JP2883087B2 (en) | 1999-04-19 |
Family
ID=16728430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21898388A Expired - Fee Related JP2883087B2 (en) | 1988-09-01 | 1988-09-01 | Earth resistivity measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2883087B2 (en) |
Cited By (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 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008056332A (en) * | 2006-09-04 | 2008-03-13 | Hitachi Ltd | Electronic component carrier tape |
| CN104375007B (en) * | 2014-11-21 | 2017-05-31 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of soil resistivity measuring method and device based on phase identification |
-
1988
- 1988-09-01 JP JP21898388A patent/JP2883087B2/en not_active Expired - Fee Related
Cited By (2)
| 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 |
| US7034539B2 (en) | 2003-07-16 | 2006-04-25 | Canon Kabushiki Kaisha | Underground exploration apparatus, system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0266466A (en) | 1990-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |