JPH1197087A - Auxiliary electrode for measuring earth resistance - Google Patents
Auxiliary electrode for measuring earth resistanceInfo
- Publication number
- JPH1197087A JPH1197087A JP27813997A JP27813997A JPH1197087A JP H1197087 A JPH1197087 A JP H1197087A JP 27813997 A JP27813997 A JP 27813997A JP 27813997 A JP27813997 A JP 27813997A JP H1197087 A JPH1197087 A JP H1197087A
- Authority
- JP
- Japan
- Prior art keywords
- plated
- silver
- net
- auxiliary electrode
- ground
- 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.)
- Pending
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、変圧器、避雷器、
高圧機器等を取り付けた鉄塔、電柱等に付設されている
接地極の接地抵抗を測定する場合に使用するに適した補
助電極に関するものである。TECHNICAL FIELD The present invention relates to a transformer, a lightning arrester,
The present invention relates to an auxiliary electrode suitable for use in measuring the ground resistance of a ground electrode provided on a steel tower, a power pole, or the like on which a high-voltage device or the like is mounted.
【0002】[0002]
【従来の技術】変圧器、避雷器、高圧機器等を取り付け
た電柱には、漏電による事故を防ぐため、接地工事が法
律で義務付けられている。この接地工事は、電柱位置の
周辺に所定深さで接地部材を埋め込んで接地極とし、該
接地極に接地線を接続することにより行われる。2. Description of the Related Art Grounding work is required by law to prevent accidents due to earth leakage on power poles equipped with transformers, lightning arresters, high-voltage equipment, and the like. This grounding work is performed by embedding a grounding member at a predetermined depth around the pole position to form a grounding electrode, and connecting a grounding wire to the grounding pole.
【0003】従来、この接地部材の埋め込み工事は、金
属棒等の接地部材をハンマ−で地中に打ち込み、埋め込
んだ接地部材の接地抵抗を測定し、その抵抗値が規定値
以下である場合は合格としている。Conventionally, this grounding member is buried in a grounding member, such as a metal rod, into the ground with a hammer, and the grounding resistance of the embedded grounding member is measured. Has passed.
【0004】上記接地抵抗の測定は、図4に示すような
方法で行われるのが一般的である。すなわち、被測定接
地極1及び補助電極(接地棒)2,3をリード線5で測
定器Mと接続し、被測定接地極1と補助電極3との間に
電流(一般に交流が用いられる)を流して抵抗を測定す
る。この場合の被測定接地極1、補助電極2及び3間の
距離Lは、5〜10m程度とする。図5はこの測定原理
を表すもので、被測定接地極1と補助電極3とを同図
(a)に示すように電源7に接続すると、両極1,3間
の電位降下は同図(b)に示すようになる。この場合、
両者の距離が十分長ければ、中央部分の電位は平らにな
るので、被測定接地極1の抵抗R1 による電位降下E1
と補助電極3の抵抗R2 による電位降下E2 が中央部分
で明瞭に分離されることになる。したがって、この中央
部分に別の補助電極2を設けて、被測定接地極1と該中
央部分の補助電極2間の電位差E1 を測定すれば、E1
=IR1 の関係からR1 =E1 /Iとなり、被測定接地
極1の接地抵抗R1 が求められるのである。The measurement of the ground resistance is generally performed by a method as shown in FIG. That is, the ground electrode 1 to be measured and the auxiliary electrodes (grounding rods) 2 and 3 are connected to the measuring instrument M via the lead wire 5, and a current (generally, alternating current is used) between the ground electrode 1 to be measured and the auxiliary electrode 3. And measure the resistance. In this case, the distance L between the measured ground electrode 1 and the auxiliary electrodes 2 and 3 is about 5 to 10 m. FIG. 5 illustrates this measurement principle. When the ground electrode 1 to be measured and the auxiliary electrode 3 are connected to a power supply 7 as shown in FIG. ). in this case,
If the distance between them is sufficiently long, the potential at the central portion becomes flat, so that the potential drop E 1 due to the resistance R 1 of the measured ground electrode 1 is obtained.
Potential drop E 2 is to be clearly separated in the central portion and by the resistance R 2 of the auxiliary electrode 3. Therefore, if another auxiliary electrode 2 is provided in this central portion and the potential difference E 1 between the ground electrode 1 to be measured and the auxiliary electrode 2 in the central portion is measured, E 1
= IR 1 , R 1 = E 1 / I, and the ground resistance R 1 of the measured ground electrode 1 is obtained.
【0005】[0005]
【発明が解決しようとする課題】ところで、上記接地抵
抗測定用の補助電極としては、導電性に富んだ金属棒が
用いられ、これを土中に打ち込んで測定するが、測定場
所の地盤が乾燥した砂れき、コンクリート、岩盤等の場
合は、金属棒からなる接地極(接地棒)を打ち込むこと
ができないためうまく測定できないという問題があっ
た。このため、金属製の網を地盤表面に被せて接地棒を
載せ、その上から水をかけて測定する等の方法が採用さ
れることもあった。As an auxiliary electrode for measuring the ground resistance, a metal rod having high conductivity is used. The metal rod is driven into the ground for measurement. In the case of debris, concrete, bedrock, etc., there is a problem that the measurement cannot be performed well because a grounding pole (grounding rod) made of a metal rod cannot be driven. For this reason, a method of placing a metal net on the ground surface, placing a grounding rod on the ground surface, and applying water on the ground rod to measure the ground rod is sometimes used.
【0006】しかしながら、金属網は面積が広いうえ、
硬くて変形しにくいので、運搬、保管等の取扱に不便で
あるほか、地盤に密着させるのが難しく、補助電極の接
地抵抗が大きくなり過ぎて、正確な測定値が得られない
という問題があった。そこで本発明は、接地棒を打ち込
むことができない硬い地盤であってもうまく接地させる
ことのできる補助電極を提供することを課題としてい
る。However, the metal net has a large area,
Since it is hard and hard to deform, it is inconvenient for handling such as transportation and storage.In addition, it is difficult to make close contact with the ground, and the ground resistance of the auxiliary electrode becomes too large, so that accurate measurement values cannot be obtained. Was. Therefore, an object of the present invention is to provide an auxiliary electrode that can be properly grounded even on hard ground where a ground rod cannot be driven.
【0007】[0007]
【課題を解決するための手段】上記課題を解決するた
め、本発明は次のような構成を採用した。すなわち、本
発明にかかる接地抵抗測定用補助電極は、銀メッキを施
した化学繊維を素材として編んだ柔軟なネットで構成さ
れることを特徴としている。銀メッキを施した化学繊維
は高価であるから、実際には、銀メッキを施した化学繊
維と、銀メッキを施していない化学繊維とを組み合わせ
て編んだ柔軟なネットとするのが経済的で好ましい。さ
らに、このネットにおける繊維と繊維が接触する交点
は、互いの密着性を高くして、電気抵抗をできるだけ小
さくする必要があるので、ネットの編み方としては、レ
ース編み、魚網編み等が好ましく、特に、縦横の糸の交
点が複雑に絡み合うラッシェル編みを採用するのが好ま
しい。この編み方によれば、交点がずれにくく、強度的
にも優れている。また、ネットは、編み目が適度に開い
ている方が柔軟であり、地盤との密着性が良くなるので
好ましい。In order to solve the above problems, the present invention employs the following configuration. That is, the auxiliary electrode for measuring ground resistance according to the present invention is characterized in that it is constituted by a flexible net woven from silver-plated chemical fiber as a material. Because silver-plated chemical fibers are expensive, it is actually economical to combine them with silver-plated chemical fibers and non-silver-plated chemical fibers to form a flexible net. preferable. Furthermore, the intersections where the fibers and the fibers in the net come into contact with each other are required to increase the adhesion between each other and reduce the electrical resistance as much as possible. In particular, it is preferable to adopt Raschel knitting in which the intersections of the vertical and horizontal yarns are complicatedly entangled. According to this knitting method, the intersection point is hard to shift and the strength is excellent. In addition, the net preferably has a moderately open stitch because it is flexible and has good adhesion to the ground.
【0008】[0008]
【発明の実施の形態】以下、本発明の実施の形態につい
て具体的に説明する。この接地抵抗測定用補助電極P
は、自重で極めて容易にたわむほど柔軟なネットからな
る。ネットは、縦横の糸(本発明では化学繊維で構成さ
れる)f,…を例えばレース編み、魚網編み、ラッシェ
ル編み等の公知の編み方で編んだもので、縦横の糸の交
点がしっかりと絡み合い、網目dの大きさは、一辺の長
さが数mm程度である。なお、網目dの形状は、多角形
(三角形、四角形、…)でもよく、その他の形状でもよ
い。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. This auxiliary electrode P for measuring ground resistance
Consists of a net that is very flexible under its own weight. The net is formed by knitting vertical and horizontal yarns (made of chemical fibers in the present invention) f,... By a known knitting method such as lace knitting, fish net knitting, Raschel knitting, etc. The size of the entanglement and the mesh d is such that the length of one side is about several mm. Note that the shape of the mesh d may be a polygon (triangle, quadrangle,...) Or another shape.
【0009】上記縦横の糸は、導電性に富んだものであ
るのが好ましく、柔軟で強度の高い化学繊維(例えばナ
イロン)に銀メッキを施したものが最も好ましい。銀メ
ッキした化学繊維としては、ナイロン繊維に銀メッキを
施したものが市販されており、これを利用するのが効果
的である。しかしながら、経済的には、銀メッキした化
学繊維と銀メッキしない化学繊維(ナイロン、ポリプロ
ピレン、ポリエステル、ポリエチレン等)とを適当な割
合で組み合わせて使用するのが好ましい。例えば、銀メ
ッキしたナイロン(以下「メッキ糸」と呼ぶ)とメッキ
しない化学繊維(以下「非メッキ糸」と呼ぶ)の割合を
1:1〜1:2程度に混合したものを好適に使用するこ
とができる。なお、銀メッキの代わりに銅メッキ、ニッ
ケルメッキ等他の金属のメッキを採用することも可能で
はあるが、実用上不安定であるので、好ましくない。The vertical and horizontal yarns are preferably highly conductive, and most preferably flexible and high-strength chemical fibers (eg, nylon) plated with silver. As the silver-plated chemical fiber, nylon fiber coated with silver is commercially available, and it is effective to use this. However, economically, it is preferable to use silver-plated chemical fibers and non-silver-plated chemical fibers (nylon, polypropylene, polyester, polyethylene, etc.) in an appropriate ratio. For example, a mixture of silver-plated nylon (hereinafter referred to as “plated yarn”) and non-plated chemical fiber (hereinafter referred to as “non-plated yarn”) in a ratio of about 1: 1 to 1: 2 is preferably used. be able to. Although it is possible to employ plating of another metal such as copper plating or nickel plating instead of silver plating, it is not preferable since it is practically unstable.
【0010】ネットを構成する縦横の糸fの太さは10
〜100デニール程度とするのが好ましいが、これに限
定されるものではない。また、ネットからなる接地抵抗
測定用補助電極の形状・寸法は、使用条件等に応じて適
当なものとすればよい。通常は、一辺の長さ50〜10
0cmの方形とするのが適当であろう。The thickness of the vertical and horizontal yarns f constituting the net is 10
It is preferably about 100 denier, but is not limited to this. Also, the shape and dimensions of the auxiliary electrode for measuring ground resistance made of a net may be appropriately determined according to the use conditions and the like. Usually, the length of one side is 50 to 10
A square of 0 cm would be appropriate.
【0011】この接地抵抗測定用補助電極Pは、図3に
示すように、地盤G上に被せて使用する。この場合、こ
の補助電極自体が柔軟なネットからなるので、地盤に対
する密着性がよい。接地抵抗測定に際しては、ネットを
構成するメッキ糸に接地端子(E)を設け、リード線5
を接続してもよく、図3に示すように、ネット上に従来
公知の接地棒Bを載せて該接地棒にリード線5を接続し
てもよい。なお、接地抵抗を低減するために、ネットの
上から水をかけておくのが好ましい。測定が終わった
ら、柔軟なネットを適当な大きさに折りたたんで、体積
を小さくすることができる。The auxiliary electrode P for measuring the ground resistance is used by covering it on the ground G as shown in FIG. In this case, since the auxiliary electrode itself is made of a flexible net, it has good adhesion to the ground. When measuring the grounding resistance, a grounding terminal (E) is provided on the plating yarn constituting the net, and the lead wire 5
Alternatively, as shown in FIG. 3, a conventionally known grounding rod B may be placed on a net, and the lead wire 5 may be connected to the grounding rod. In addition, it is preferable to spray water on the net in order to reduce the grounding resistance. After the measurement is completed, the volume can be reduced by folding the flexible net into an appropriate size.
【0012】[0012]
【実施例】メッキ糸として、米国Sauquoit社製
銀メッキナイロン繊維(商品名「X−static 3
0XS10」)を使用し、メッキしないナイロン繊維か
らなる非メッキ糸と1:1の割合で組み合わせてラッシ
ェル編みで図1に示すようなネットを製作した。このネ
ットは、電気抵抗が100Ω以下であり、これを70c
m角に切り出して補助電極とし、横河電気(株)社製接
地抵抗計3235型を用いて被測定接地極の接地抵抗を
測定したところ、岩盤上においてもうまく接地抵抗を測
定することができた。EXAMPLE A silver-plated nylon fiber (trade name "X-static 3") manufactured by Sauquoit Co., USA was used as a plating thread.
0XS10 ") was combined with a non-plated yarn made of non-plated nylon fiber at a ratio of 1: 1 to produce a net as shown in FIG. 1 by Raschel knitting. This net has an electric resistance of 100Ω or less,
When an earth electrode was cut out into an m-square and used as an auxiliary electrode, and the earth resistance of the earth electrode to be measured was measured using a ground resistance meter 3235 manufactured by Yokogawa Electric Corporation, the earth resistance was successfully measured even on the rock. Was.
【0013】[0013]
【発明の効果】以上に説明したように、本発明にかかる
接地抵抗測定用補助電極は、銀メッキを施した化学繊維
を用いて編んだ柔軟なネットで構成されるので、導電性
に富んでいるばかりでなく、地盤に対する密着性が良好
であり、従来の接地棒からなる補助電極を打ち込むこと
ができない地盤においても接地抵抗を簡単かつ正確に測
定することが可能となった。また、このネットからなる
補助電極は柔軟であり、不使用時には小さく折り畳んで
おくことができるので、取扱に便利なものとなった。As described above, the auxiliary electrode for measuring ground resistance according to the present invention is formed of a flexible net woven from silver-plated chemical fiber, and thus has high conductivity. In addition to this, it is possible to easily and accurately measure the ground resistance even in the ground where the adhesion to the ground is good and the auxiliary electrode composed of the conventional ground rod cannot be driven. Further, the auxiliary electrode made of the net is flexible and can be folded small when not in use, so that it is convenient for handling.
【図1】本発明の実施形態を例示する外観図である。FIG. 1 is an external view illustrating an embodiment of the present invention.
【図2】その要部の拡大図である。FIG. 2 is an enlarged view of a main part thereof.
【図3】使用法の説明図である。FIG. 3 is an explanatory diagram of a method of use.
【図4】接地抵抗測定法の説明図である。FIG. 4 is an explanatory diagram of a ground resistance measuring method.
【図5】その原理を表す説明図である。FIG. 5 is an explanatory diagram showing the principle.
1 被測定接地極 2,3 補助電極 5 リード線 P 補助電極 f 糸(化学繊維) d 網目 E 接地端子 1 ground electrode to be measured 2, 3 auxiliary electrode 5 lead wire P auxiliary electrode f thread (chemical fiber) d mesh E ground terminal
───────────────────────────────────────────────────── フロントページの続き (72)発明者 福嶋 茂雄 山口県美祢市伊佐町伊佐5078番地の1 テ クニカルアースシステム株式会社内 (72)発明者 市川 善浩 岡山市福浜西町2番16号 株式会社アイワ ンズ内 (72)発明者 滝沢 誠 東京都中央区日本橋人形町3丁目7番2号 明弘トレーディング株式会社内 (72)発明者 黒澤 昇 群馬県新田郡薮塚本町大字大原1141番地 株式会社黒沢レース内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeo Fukushima 507-1 Isa-machi, Isa-cho, Mine-shi, Yamaguchi Pref. (72) Inventor Makoto Takizawa 3-7-2 Nihonbashi Ningyocho, Chuo-ku, Tokyo Akihiro Trading Co., Ltd. (72) Inventor Noboru Kurosawa 1141 Ohara, Yabutsukahonmachi, Nitta-gun, Gunma Prefecture Kurosawa Race Co., Ltd.
Claims (3)
編んだ柔軟なネットからなる接地抵抗測定用補助電極。1. An auxiliary electrode for measuring ground resistance, comprising a flexible net woven from silver-plated chemical fibers.
を施していない化学繊維とを組み合わせて編んだ柔軟な
ネットからなる接地抵抗測定用補助電極。2. An auxiliary electrode for measuring ground resistance, comprising a flexible net woven from a combination of silver-plated chemical fibers and non-silver-plated chemical fibers.
請求項1又は請求項2に記載の接地抵抗測定用補助電
極。3. The auxiliary electrode for measuring ground resistance according to claim 1, wherein the net is woven by Raschel knitting.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27813997A JPH1197087A (en) | 1997-09-24 | 1997-09-24 | Auxiliary electrode for measuring earth resistance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27813997A JPH1197087A (en) | 1997-09-24 | 1997-09-24 | Auxiliary electrode for measuring earth resistance |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1197087A true JPH1197087A (en) | 1999-04-09 |
Family
ID=17593140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27813997A Pending JPH1197087A (en) | 1997-09-24 | 1997-09-24 | Auxiliary electrode for measuring earth resistance |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1197087A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012134073A (en) * | 2010-12-23 | 2012-07-12 | Ftes Kk | Auxiliary electrode for measuring grounding resistance |
JP2014175298A (en) * | 2013-03-13 | 2014-09-22 | Railway Technical Research Institute | Grounding device |
WO2023243235A1 (en) * | 2022-06-13 | 2023-12-21 | 日置電機株式会社 | Portable ground electrode, ground resistance measuring device, and ground resistance measuring method |
-
1997
- 1997-09-24 JP JP27813997A patent/JPH1197087A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012134073A (en) * | 2010-12-23 | 2012-07-12 | Ftes Kk | Auxiliary electrode for measuring grounding resistance |
JP2014175298A (en) * | 2013-03-13 | 2014-09-22 | Railway Technical Research Institute | Grounding device |
WO2023243235A1 (en) * | 2022-06-13 | 2023-12-21 | 日置電機株式会社 | Portable ground electrode, ground resistance measuring device, and ground resistance measuring method |
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