JPH0587847A - Measurement of grounding resistance - Google Patents
Measurement of grounding resistanceInfo
- Publication number
- JPH0587847A JPH0587847A JP7010691A JP7010691A JPH0587847A JP H0587847 A JPH0587847 A JP H0587847A JP 7010691 A JP7010691 A JP 7010691A JP 7010691 A JP7010691 A JP 7010691A JP H0587847 A JPH0587847 A JP H0587847A
- Authority
- JP
- Japan
- Prior art keywords
- measured
- grounding
- equipment
- current
- grounding equipment
- 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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Links
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【０００１】〔発明の構成〕[Configuration of Invention]
【０００２】[0002]
【産業上の利用分野】本発明は発電所、変電所または開
閉所などの電気所の接地抵抗を測定する接地抵抗の測定
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground resistance measuring method for measuring the ground resistance of an electric station such as a power plant, a substation or a switchyard.
【０００３】[0003]
【従来の技術】従来のこの種の接地抵抗の測定方法とし
ては、図４に示すように、被測定接地設備１の適当箇所
に電圧極２と電流極３とを設置し、この電圧極２に電位
計４を接続するとともに電流極３に電流計５を接続した
測定装置６を備え、この測定装置６に被測定接地設備１
の系統電源と同一周波数の交流電源７の電流を流し、電
位計４にて電位値Ｖを測定するとともに電流計５にて電
流値ｉを測定し、電圧降下値を測定して設置抵抗計算す
る方法が知られている。2. Description of the Related Art As a conventional method of measuring the ground resistance of this type, as shown in FIG. 4, a voltage pole 2 and a current pole 3 are installed at appropriate places of a grounding equipment 1 to be measured, and the voltage pole 2 Is equipped with a measuring device 6 in which an electrometer 4 is connected to the current pole 3 and an ammeter 5 is connected to the current pole 3.
The current of the AC power supply 7 having the same frequency as that of the system power supply is passed, the potential value V is measured by the electrometer 4 and the current value i is measured by the ammeter 5, and the voltage drop value is measured to calculate the installation resistance. The method is known.
【０００４】この方法では、被測定設置設備１の系統か
らの誘導による影響を避けて測定誤差を小さくするため
には、測定電流を大きくすることが必要で、特に電力系
統の設置設備においては大きい測定電流を用いるため
に、電流極３は所定の低抵抗としなければならず、所要
の抵抗値が得られない場合には、試験電源を大きくし
て、所要の電流を流すこととなるため、試験電源は大容
量となり、仮設備費ね人件費が増大する問題がある。According to this method, it is necessary to increase the measurement current in order to avoid the influence of induction from the system of the installation equipment 1 to be measured and to reduce the measurement error, which is particularly large in the installation equipment of the power system. In order to use the measured current, the current pole 3 must have a predetermined low resistance, and if the required resistance value cannot be obtained, the test power supply is increased to pass the required current. The test power supply has a large capacity, and there is a problem that temporary equipment costs and personnel costs increase.
【０００５】そこで、系統の誘導対策および試験設備の
小形軽量化を図るために、被測定接地設備１の系統電源
と異なる周波数の試験電源を用いることが提案されてい
る。この方法は、商用周波数近接の２種類の周波数で測
定しその平均値を求めるようにしているが、被測定接地
設備に送電線または電力ケーブルなどが接続されるの
で、実質並列の接地抵抗を測定することになり、被測定
接地設備の固有の抵抗を測定することは困難であるとい
う問題を有している。また、例えば、特開昭６１ー１３
２８８０号公報に記載された送電線鉄塔の接地抵抗を測
定する方法が知られている。この方法は図５に示すよう
に、送電線10を流れる負荷電流によって各径間の架空地
線11に起電力が誘起され、電流はそれぞれの架空地線1
1、鉄塔13、大地14、鉄塔13、架空地線11のループを流
れることから、任意の還流電流はこの鉄塔を流れる各電
流を合成したものであり、この電流が鉄塔の電位を上昇
させている。この電圧と電流を変流器（ＣＴ）15にて測
定することにより鉄塔13の接地抵抗を測定するようにし
ている。Therefore, it has been proposed to use a test power source having a frequency different from that of the system power source of the grounding equipment under test 1 in order to take measures against system induction and to reduce the size and weight of the test facility. This method measures two types of frequencies close to the commercial frequency and obtains the average value. However, since the transmission line or power cable is connected to the grounding equipment to be measured, the ground resistance in parallel is measured. Therefore, there is a problem that it is difficult to measure the specific resistance of the grounding equipment to be measured. Further, for example, JP-A-61-113
A method for measuring the ground resistance of a power transmission line tower described in Japanese Patent No. 2880 is known. In this method, as shown in FIG. 5, an electromotive force is induced in the overhead ground wire 11 in each span by the load current flowing through the power transmission line 10, and the current is changed to the respective overhead ground wire 1
Since it flows through the loop of 1, tower 13, earth 14, tower 13, overhead ground wire 11, any return current is a combination of the currents flowing through this tower, and this current raises the potential of the tower. There is. The ground resistance of the tower 13 is measured by measuring this voltage and current with the current transformer (CT) 15.
【０００６】この方法では小規模の鉄塔の接地設備で問
題がないとしても、大形鉄塔となると、変流器などが大
形となり、測定も困難になる問題を有している。また、
この方法では発電所、変電所および開閉所の接地設備の
測定はきわめて困難である。In this method, even if there is no problem in the grounding equipment of a small-sized steel tower, a large-sized steel tower has a problem that the current transformer and the like become large and the measurement becomes difficult. Also,
This method makes it extremely difficult to measure grounding equipment at power plants, substations, and switchyards.
【０００７】[0007]
【発明が解決しようとする課題】上記従来の接地抵抗測
定方法では、被測定接地設備系統からの誘導の影響を受
け、発電所、変電所および開閉所のような接地設備にお
いて運転状態で随時測定することが困難である。また、
架空地線または電力ケーブルの金属シースが接地設備に
接続されて、他の接地設備と並列接続となっていると、
固有の接地抵抗値を測定することがきわめて困難とな
る。SUMMARY OF THE INVENTION In the above-mentioned conventional ground resistance measuring method, the grounding equipment such as a power plant, a substation, and a switchyard is subjected to the influence of induction from a grounding equipment system to be measured, and it is measured at any time in an operating state. Difficult to do. Also,
If the metal sheath of the overhead ground wire or power cable is connected to the grounding equipment and is connected in parallel with other grounding equipment,
It is extremely difficult to measure the intrinsic ground resistance value.
【０００８】本発明は上記問題点に鑑みなされたもの
で、被測定接地設備の固有の接地抵抗を容易に測定で
き、架空系、ケーブル系などの状態に関係なく測定が可
能で、さらに、試験電源を、特に必要としない接地抵抗
の測定方法を提供するものである。The present invention has been made in view of the above problems. It is possible to easily measure the ground resistance peculiar to the grounding equipment to be measured, and to perform the measurement regardless of the state of the aerial system, the cable system, etc. The present invention provides a method for measuring ground resistance that does not require a power supply.
【０００９】〔発明の構成〕[Constitution of Invention]
【００１０】[0010]
【課題を解決するための手段】本発明の接地抵抗の測定
方法は、被測定接地設備20の適当箇所に電圧極21と電流
極22とを設置し、この電圧極21に電位計23を接続し、前
記電流極22に電位計24とスイッチ25を介して電流計26と
をそれぞれ接続した接地抵抗測定装置を備え、前記接地
抵抗測定装置のスイッチ15を開放して前記電位計23，24
にて被測定接地設備20の電位値Ｖ１、Ｖ２を測定し、前
記スイッチ25を閉成して前記電圧極21に接続した電位計
23にて被測定接地設備20の電位値Ｖ11を測定するととも
に前記電流計26にて被測定接地設備20の電流値ｉを測定
し、被測定接地設備20の接地抵抗ＲｓをＲｓ＝（Ｖ１／
Ｖ２）×（Ｖ１−Ｖ11）／ｉの計算式で求めるものであ
る。According to the grounding resistance measuring method of the present invention, a voltage pole 21 and a current pole 22 are installed at appropriate points of a grounding equipment 20 to be measured, and an electrometer 23 is connected to the voltage pole 21. A ground resistance measuring device in which an electrometer 24 and an ammeter 26 are respectively connected to the current electrode 22 via a switch 25, and the switch 15 of the ground resistance measuring device is opened to open the electrometers 23, 24.
Measure the potential values V 1 and V 2 of the grounding equipment 20 to be measured, and close the switch 25 to connect the voltage electrode 21 to the electrometer.
At 23, the potential value V 11 of the grounded equipment 20 to be measured is measured, and at the same time, the current value i of the grounded equipment 20 to be measured is measured by the ammeter 26, and the ground resistance Rs of the grounded equipment 20 to be measured is Rs = (V 1 /
This is obtained by the calculation formula of V 2 ) × (V 1 −V 11 ) / i.
【００１１】[0011]
【作用】本発明の接地抵抗の測定方法は、被測定接地設
備に流れる残留電流による電位上昇を利用するもので、
図１の電流極22に接続したスイッチ25を開放して被測定
接地設備20の電位値Ｖ１、Ｖ２を測定し、次いで、この
スイッチ25を閉成して、被測定接地設備の電圧極21に接
続した電位計23にて電位値Ｖ11を測定し、さらに、被測
定接地設備20の電流値ｉを電流計26にて測定し、この測
定値に基づいて（Ｖ１／Ｖ２）×（Ｖ１−Ｖ11）／ｉの
計算式で被測定接地設備20の接地抵抗を求める。The grounding resistance measuring method of the present invention utilizes the potential rise due to the residual current flowing through the grounding equipment to be measured.
The switch 25 connected to the current pole 22 of FIG. 1 is opened to measure the potential values V 1 and V 2 of the grounding equipment 20 to be measured, and then this switch 25 is closed to make the voltage pole of the grounding equipment to be measured. The potential value V 11 is measured by the potentiometer 23 connected to 21, and the current value i of the grounding equipment 20 to be measured is further measured by the ammeter 26. Based on this measured value (V 1 / V 2 ). The ground resistance of the grounding equipment 20 to be measured is calculated by the formula of × (V 1 −V 11 ) / i.
【００１２】[0012]
【実施例】本発明の一実施例の方法を説明する。EXAMPLE A method of an example of the present invention will be described.
【００１３】図１に示すように、発電所、変電所または
開閉所などの電気所の接地設備20のメッシュ電極などに
て形成されている被測定接地設置設備20の適当箇所に電
圧極21と電流極22とを設置する。この電圧極21に高イン
ピーダンスの電位計23を接続するとともに前記電流極22
に高インピーダンス電位計24を接続し、この電位計24に
並列にスイッチ25を介して低インピーダンスの電流計26
を接続して接地抵抗測定装置27を構成する。As shown in FIG. 1, a voltage electrode 21 and a voltage electrode 21 are provided at appropriate points of the ground installation equipment 20 to be measured, which is formed by mesh electrodes of the ground equipment 20 of an electric station such as a power plant, a substation, or a switchyard. Install the current pole 22. A high-impedance electrometer 23 is connected to the voltage pole 21 and the current pole 22
High-impedance electrometer 24 is connected to the low-impedance ammeter 26 via switch 25 in parallel with this electrometer 24.
Are connected to form a ground resistance measuring device 27.
【００１４】そして、この接地抵抗測定装置27のスイッ
チ25を開放した状態で前記電位計23，24にて被測定接地
設備20の電位値Ｖ１、Ｖ２を測定する。次いで、この電
位計23による電位値Ｖ１の測定から間隔を極力短くして
前記スイッチ25を閉成して前記電位計23にて被測定接地
設備20の電位値Ｖ11を測定するとともに前記電流計26に
て被測定接地設備20の電流値ｉを測定する。Then, with the switch 25 of the earthing resistance measuring device 27 opened, the electric potentials V 1 and V 2 of the grounding equipment 20 to be measured are measured by the electrometers 23 and 24. Next, the interval from the measurement of the potential value V 1 by the electrometer 23 is shortened as much as possible, the switch 25 is closed, the potential value V 11 of the grounding equipment 20 to be measured is measured by the electrometer 23, and the current is measured. The current value i of the grounding equipment 20 to be measured is measured by the total 26.
【００１５】この各測定値に基づいて、被測定接地設備
20の接地抵抗Ｒｓを Ｒｓ＝（Ｖ１／Ｖ２）×（Ｖ１−Ｖ11）／ｉ の計算式で求める。Based on these measured values, the grounding equipment under test is measured.
The ground resistance Rs of 20 is obtained by the calculation formula of Rs = (V 1 / V 2 ) × (V 1 −V 11 ) / i.
【００１６】図２に示すように、発電所、変電所または
開閉所などの電気所には、架空電力線30の架空地線28は
接地設備20に接続されている。そして、これらの架空地
線28は電力線30からの誘導により誘導電流ｉが流れてい
る。この誘導電流のベクトル和は の計算式で求められる。As shown in FIG. 2, an overhead ground wire 28 of an overhead power line 30 is connected to a ground facility 20 at an electric station such as a power plant, a substation or a switchyard. Then, an induction current i flows through these overhead ground wires 28 due to induction from the power line 30. The vector sum of this induced current is It is calculated by the formula.
【００１７】この誘導電流のベクトル和Ｉo が残留電流
となり、電気所の接地設備20に流れて、Ｖ0 ＝Ｉo Ｒｓ
の電位上昇をさせている。この残留電流による電位を利
用して接地抵抗Ｒｓを測定することができる。The vector sum Io of this induced current becomes the residual current, which flows into the grounding equipment 20 at the electric power station, and V 0 = Io Rs
The potential of is increasing. The ground resistance Rs can be measured by utilizing the potential due to this residual current.
【００１８】例えば、図３について、被測定接地設備20
の接地抵抗Ｒｓを求める方法について説明する。For example, referring to FIG.
A method of obtaining the ground resistance Rs of will be described.
【００１９】被測定接地設備20に流れる残留電流Ｉo を
10Ａとし、電流極22の接地抵抗Ｒを100 Ωとすれば、 Ｖ１＝10Ａ×１Ω＝10Ｖ Ｖ２＝10Ａ×100 ×１／（100 ＋１）Ω＝9.901 Ｖ ｉ＝9.901 Ｖ／100 ＝0.099 Ａ Ｒｓ＝（10−9,901 ）Ｖ／0.099 Ａ＝１Ω の計算により被測定接地設備20の接地抵抗Ｒｓを残留電
流Ｉo に基いて測定できる。The residual current Io flowing through the measured grounding equipment 20 is
Assuming that the ground resistance R of the current pole 22 is 10 Ω and 10 A, V 1 = 10 A × 1 Ω = 10 V V 2 = 10 A × 100 × 1 / (100 +1) Ω = 9.901 V i = 9.901 V / 100 = 0.099 The ground resistance Rs of the grounding equipment 20 to be measured can be measured based on the residual current Io by the calculation of ARs = (10-9,901) V / 0.099 A = 1Ω.
【００２０】このように、電気所の運転中でも随時測定
が可能で、架空地線28または架空電力線30の金属シース
などが被測定接地設備20に接続され、他の電気所と並列
接続になっていても、被測定接地設備20の固有の接地抵
抗Ｒｓを測定することが可能で、他の設備の影響を受け
ることがなく、さらに、電流極22の電流容量も少なく
（0.5 Ａ以下）、また、測定のための電源を必要としな
い（電池内蔵式）ので、測定方法も簡易となり、経済的
に測定できる。As described above, the measurement can be performed at any time even while the electric station is operating, and the metal sheath of the overhead ground wire 28 or the overhead power line 30 is connected to the grounding equipment 20 to be measured and is connected in parallel with other electric stations. Even though the ground resistance Rs peculiar to the ground equipment under test 20 can be measured, it is not affected by other equipment, and the current capacity of the current pole 22 is small (0.5 A or less). Since a power source for measurement is not required (battery built-in type), the measurement method is simple and can be economically measured.
【００２１】さらに、スイッチ25の開閉によって電圧の
変化値と電流地が得られるので、電流極22を仮想無限遠
点として、電極の位置を選択する必要がない。Further, since the change value of the voltage and the current source are obtained by opening and closing the switch 25, it is not necessary to select the position of the electrode with the current pole 22 as the virtual infinity point.
【００２２】[0022]
【発明の効果】本発明によれば、被測定接地設備の残留
電流による電位値、および電流値を測定して被測定接地
設備の接地抵抗を測定するので、接地抵抗の測定値は被
測定接地設備固有の値が得られ、電気所の架空系、ケー
ブルなどの形態に関係なく測定でき、試験電源を必要と
せず、電流極は特に仮想無限遠点とする必要がない利点
を有している。According to the present invention, the ground resistance of the grounding equipment to be measured is measured by measuring the potential value and the current value due to the residual current of the grounding equipment to be measured. The value unique to the equipment can be obtained, it can be measured regardless of the form of the aerial system of the electric station, the form of the cable, etc., it does not require a test power source, and the current pole has the advantage that it does not need to be a virtual infinite point. ..
【図１】本発明の接地抵抗測定方法の原理説明図であ
る。FIG. 1 is an explanatory view of the principle of a ground resistance measuring method of the present invention.
【図２】本発明の接地抵抗測定方法の一実施例を示す説
明図である。FIG. 2 is an explanatory diagram showing an example of a ground resistance measuring method of the present invention.
【図３】本発明の接地抵抗測定方法の一実施例を示す回
路図である。FIG. 3 is a circuit diagram showing an embodiment of a ground resistance measuring method of the present invention.
【図４】従来の接地抵抗測定方法の説明図である。FIG. 4 is an explanatory diagram of a conventional ground resistance measuring method.
【図５】他の従来の接地抵抗測定方法の説明図である。FIG. 5 is an explanatory diagram of another conventional ground resistance measuring method.
20 被測定接地設備 21 電圧極 22 電流極 23，24 電位計 25 スイッチ 26 電流計 20 Grounding equipment to be measured 21 Voltage pole 22 Current pole 23, 24 Electrometer 25 Switch 26 Ammeter
Claims (1)
流極とを設置し、この電圧極に電位計を接続するととも
に前記電流極に電位計と、スイッチを介して電流計とを
それぞれ接続した接地抵抗測定装置を備え、 前記接地抵抗測定装置のスイッチを開放して前記電位計
にて被測定接地設備の電位値Ｖ１、Ｖ２を測定し、 前記スイッチを閉成して前記電圧極に接続した電位計に
て被測定接地設備の電位値Ｖ11を測定するとともに前記
電流計にて被測定接地設備の電流値ｉを測定し、 被測定接地設備の接地抵抗Ｒｓを Ｒｓ＝（Ｖ１／Ｖ２）×（Ｖ１−Ｖ11）／ｉ の計算式で求めることを特徴とした接地抵抗の測定方
法。1. A voltage pole and a current pole are installed at appropriate places of the grounding equipment to be measured, and an electrometer is connected to this voltage pole, and an electrometer is connected to the current pole and an ammeter via a switch. A ground resistance measuring device connected to the ground resistance measuring device is opened to open the switch of the ground resistance measuring device to measure the potential values V 1 and V 2 of the ground equipment to be measured with the electrometer, and the switch is closed to open the voltage. The potential value V 11 of the grounding equipment to be measured is measured by the electrometer connected to the pole, the current value i of the grounding equipment to be measured is measured by the ammeter, and the ground resistance Rs of the grounding equipment to be measured is Rs = ( A method for measuring ground resistance, characterized in that it is obtained by a calculation formula of V 1 / V 2 ) × (V 1 −V 11 ) / i.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7010691A JPH0769368B2 (en) | 1991-04-02 | 1991-04-02 | Ground resistance measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7010691A JPH0769368B2 (en) | 1991-04-02 | 1991-04-02 | Ground resistance measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0587847A true JPH0587847A (en) | 1993-04-06 |
| JPH0769368B2 JPH0769368B2 (en) | 1995-07-31 |
Family
ID=13421959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7010691A Expired - Fee Related JPH0769368B2 (en) | 1991-04-02 | 1991-04-02 | Ground resistance measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0769368B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100521635B1 (en) * | 2001-12-14 | 2005-10-12 | 주식회사 포스코 | Apparatus for searching the principal earth plate |
| KR100609713B1 (en) * | 2005-04-27 | 2006-08-08 | 한국전자통신연구원 | Grounding resistance measurement and soil structure detection using the slope degree of voltage differences |
| KR100821705B1 (en) * | 2006-09-13 | 2008-04-14 | 전명수 | Earth resistance measurement method by clamp-on type current comparison |
| CN101825662A (en) * | 2010-05-28 | 2010-09-08 | 贵州南源电力科技开发有限公司 | Short-distance measurement method and structure of grounding resistance of grounding network |
| WO2012015107A1 (en) * | 2010-07-28 | 2012-02-02 | 한국전력공사 | Method for apparatus for measuring composite ground resistance of neutral wire of distribution line in operation |
| CN106154047A (en) * | 2016-06-22 | 2016-11-23 | 云南电网有限责任公司电力科学研究院 | A kind of measuring method of Resistance of Grounding Grids |
-
1991
- 1991-04-02 JP JP7010691A patent/JPH0769368B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100521635B1 (en) * | 2001-12-14 | 2005-10-12 | 주식회사 포스코 | Apparatus for searching the principal earth plate |
| KR100609713B1 (en) * | 2005-04-27 | 2006-08-08 | 한국전자통신연구원 | Grounding resistance measurement and soil structure detection using the slope degree of voltage differences |
| WO2006115380A1 (en) * | 2005-04-27 | 2006-11-02 | Electronics And Telecommunications Research Institute | Method of detecting soil structure using voltage slope and measuring earth resistance |
| US7859266B2 (en) | 2005-04-27 | 2010-12-28 | Electronics And Telecommunications Research Institute | Method of detecting soil structure using voltage slope and measuring earth resistance |
| KR100821705B1 (en) * | 2006-09-13 | 2008-04-14 | 전명수 | Earth resistance measurement method by clamp-on type current comparison |
| CN101825662A (en) * | 2010-05-28 | 2010-09-08 | 贵州南源电力科技开发有限公司 | Short-distance measurement method and structure of grounding resistance of grounding network |
| WO2012015107A1 (en) * | 2010-07-28 | 2012-02-02 | 한국전력공사 | Method for apparatus for measuring composite ground resistance of neutral wire of distribution line in operation |
| CN106154047A (en) * | 2016-06-22 | 2016-11-23 | 云南电网有限责任公司电力科学研究院 | A kind of measuring method of Resistance of Grounding Grids |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0769368B2 (en) | 1995-07-31 |
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