JPH07159461A - Method and instrument for measuring electrical resistance - Google Patents
Method and instrument for measuring electrical resistanceInfo
- Publication number
- JPH07159461A JPH07159461A JP5339493A JP33949393A JPH07159461A JP H07159461 A JPH07159461 A JP H07159461A JP 5339493 A JP5339493 A JP 5339493A JP 33949393 A JP33949393 A JP 33949393A JP H07159461 A JPH07159461 A JP H07159461A
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- JP
- Japan
- Prior art keywords
- conductor
- resistance
- measured
- voltage
- resistor
- 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)
- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、接続部等の導体の抵抗
を、交流電流が流れる活線状態で測定できるようにした
電気抵抗測定方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric resistance measuring method capable of measuring the resistance of a conductor such as a connecting portion in a live state where an alternating current flows.
【０００２】また、上記電気抵抗測定方法を用いて導体
の抵抗を測定するための電気抵抗測定装置に関するもの
である。The present invention also relates to an electric resistance measuring device for measuring the resistance of a conductor by using the above electric resistance measuring method.
【０００３】[0003]
【従来の技術】導体の抵抗を測定する従来の方法の１つ
として、導体を停電状態として、抵抗測定すべき箇所の
両端に電流印加用端子と電圧測定用端子をそれぞれ設
け、測定箇所に所定直流電流を外部から印加し、この直
流電流による降下電圧を測定し、電流と電圧から抵抗値
を算出するものが知られている。2. Description of the Related Art As one of the conventional methods for measuring the resistance of a conductor, a conductor is put into a power failure state, and a current application terminal and a voltage measurement terminal are provided at both ends of a location where resistance is to be measured, and a predetermined measurement location is provided. It is known that a direct current is applied from the outside, the voltage drop due to this direct current is measured, and the resistance value is calculated from the current and the voltage.
【０００４】また、活線状態のまま導体の抵抗を測定す
る方法としては、測定すべき箇所の両端に電圧測定用端
子を設け、導体に流れる交流電流をクランプメータ等で
測定し、導体に流れる交流電流による降下電圧を測定し
て抵抗値を算出するものがある。Further, as a method of measuring the resistance of a conductor in a live state, voltage measuring terminals are provided at both ends of a portion to be measured, an alternating current flowing through the conductor is measured by a clamp meter or the like, and the current is passed through the conductor. There is a method in which a resistance value is calculated by measuring a voltage drop caused by an alternating current.
【０００５】[0005]
【発明が解決しようとする課題】上記した従来の停電状
態として導体の抵抗を測定する方法にあっては、測定用
端子を導体に接続する部分の抵抗が測定結果に大きな影
響を与え、誤差が大きい。また、送電線路や変電所設備
等の高圧の裸導体を停電状態とすれば、電力供給等に対
する影響が極めて大きく、実際問題として容易には測定
することができない。そこで、送電線路の新規な装架や
交換等の際に用いることができるにすぎない。In the conventional method of measuring the resistance of the conductor in the power failure state as described above, the resistance of the portion connecting the measuring terminal to the conductor has a great influence on the measurement result, and the error is large. Further, if a high-voltage bare conductor such as a power transmission line or a substation facility is put into a power failure state, it has a great influence on power supply and the like, and cannot be easily measured as a practical problem. Therefore, it can only be used for new mounting or replacement of the transmission line.
【０００６】また、上記した活線状態のまま導体の抵抗
を測定する方法にあっては、測定すべき抵抗による降下
電圧を正確に測定することができず、測定誤差が大き
い。これは、導体と降下電圧を測定するための回路によ
り１つの閉回路が形成され、この閉回路に導体を流れる
交流電流により導体の回りに生じる磁束によって誘導起
電力が生じ、この誘導起電力に降下電圧が加わった電圧
が測定されるためである。特に、導体の抵抗が小さけれ
ば誘導起電力に対して相対的に抵抗による降下電圧が小
さく、誤差も大きなものとなる。Further, in the method of measuring the resistance of the conductor in the above-described live state, the voltage drop due to the resistance to be measured cannot be accurately measured, and the measurement error is large. This is because one closed circuit is formed by a conductor and a circuit for measuring a voltage drop, and an induced electromotive force is generated by a magnetic flux generated around the conductor by an alternating current flowing through the conductor in the closed circuit. This is because the voltage to which the voltage drop is applied is measured. In particular, if the resistance of the conductor is small, the voltage drop due to the resistance is small relative to the induced electromotive force, and the error is large.
【０００７】したがって、活線状態のままで、導体の抵
抗を正確に測定できる電気抵抗測定方法およびそのため
の装置が要望されていた。Therefore, there has been a demand for an electric resistance measuring method and an apparatus therefor capable of accurately measuring the resistance of a conductor in a live state.
【０００８】本発明は、上記のごとき従来方法の事情に
鑑みてなされたもので、活線状態のままで導体の抵抗を
正確に測定し得る電気抵抗測定方法および電気抵抗測定
装置を提供することを目的とする。The present invention has been made in view of the circumstances of the conventional method as described above, and provides an electric resistance measuring method and an electric resistance measuring apparatus capable of accurately measuring the resistance of a conductor in a live state. With the goal.
【０００９】[0009]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明の電気抵抗測定方法は、矩形の閉回路を、
抵抗測定の対象となる導体と同一平面上で一辺を前記導
体と平行にして接近させ、前記閉回路の前記導体と平行
で近い側の第１の辺に第１抵抗と第１開閉スイッチを直
列に介装し、前記閉回路の前記導体と平行で遠い側の第
２の辺に前記第１抵抗と同じ値の第２抵抗と第２開閉ス
イッチを直列に介装し、前記第１の辺の両端を前記導体
の抵抗を測定すべき箇所の両端にそれぞれ接続線で接続
し、これらの接続線のすくなくとも一方に第３開閉スイ
ッチを直列に介装し、前記第１と第２開閉スイッチを閉
じて、前記第３開閉スイッチを開いて前記第１または第
２抵抗の降下電圧を測定して第１測定電圧となし、前記
第１と第３開閉スイッチを閉じて、前記第２開閉スイッ
チを開いて前記第１抵抗の降下電圧を測定して第２測定
電圧となし、前記第２と第３開閉スイッチを閉じて、前
記第１開閉スイッチを開いて前記第２抵抗の降下電圧を
測定して第３測定電圧となし、前記第２と第３測定電圧
の差電圧と、前記第１測定電圧とから、前記導体の抵抗
が演算される。In order to achieve the above object, the electric resistance measuring method of the present invention comprises a rectangular closed circuit,
On the same plane as the conductor whose resistance is to be measured, one side is made parallel to and close to the conductor, and the first resistance and the first opening / closing switch are connected in series to the first side of the closed circuit that is close to and parallel to the conductor. A second resistor having the same value as the first resistor and a second open / close switch in series on a second side of the closed circuit that is parallel to the conductor and is on the far side. Both ends of the conductor are respectively connected to both ends of the portion where the resistance of the conductor is to be measured, and a third open / close switch is connected in series to at least one of these connection lines to connect the first and second open / close switches. Closed, the third open / close switch is opened to measure the voltage drop of the first or second resistor to obtain the first measured voltage, and the first and third open / close switches are closed to open the second open / close switch. Open to measure the voltage drop of the first resistor to obtain the second measured voltage, 2 and a third open / close switch are closed, the first open / close switch is opened, and the voltage drop of the second resistor is measured to be a third measured voltage, and the difference voltage between the second and third measured voltages, and The resistance of the conductor is calculated from the first measured voltage.
【００１０】そして、前記第１の辺と前記導体の抵抗を
測定すべき箇所とこれらを接続する前記接続線で矩形閉
回路を形成し、前記第２と第３測定電圧の差電圧に代え
て、前記第２と第３測定電圧の比から前記導体と前記第
１の辺の間の距離を演算し、この距離と前記第１測定電
圧から前記導体の抵抗を演算しても良い。Then, a rectangular closed circuit is formed by the first side, the portion where the resistance of the conductor is to be measured, and the connecting line connecting these, and instead of the differential voltage between the second and third measured voltages. The distance between the conductor and the first side may be calculated from the ratio of the second and third measurement voltages, and the resistance of the conductor may be calculated from this distance and the first measurement voltage.
【００１１】また、本発明の電気抵抗測定装置は、抵抗
測定の対象となる導体に、同一平面上で一辺を前記導体
と平行にして接近させる矩形の閉回路と、前記閉回路の
前記導体と平行で近い側の第１の辺に直列に介装された
第１抵抗と第１開閉スイッチと、前記閉回路の前記導体
と平行で遠い側の第２の辺に直列に介装された前記第１
抵抗と同じ値の第２抵抗と第２開閉スイッチと、先端に
接触子を有し前記第１の辺の両端を前記導体の抵抗を測
定すべき箇所の両端にそれぞれ接続する接続線と、前記
第１と第２と第３開閉スイッチを開閉制御するスイッチ
制御部と、前記第１と第２と第３開閉スイッチの所定の
制御状態で前記第１または第２抵抗の降下電圧を測定す
る電圧測定部と、この電圧測定部による測定電圧から前
記導体の抵抗を演算する演算処理部と、を備えて構成さ
れている。Further, the electric resistance measuring apparatus of the present invention comprises: a rectangular closed circuit for approaching a conductor whose resistance is to be measured with one side parallel to the conductor on the same plane; and the conductor of the closed circuit. The first resistor and the first opening / closing switch which are inserted in series on the first side on the parallel and near side, and the first resistor and the first opening / closing switch which are inserted on the second side on the far side in parallel with the conductor of the closed circuit in series. First
A second resistance having the same value as the resistance, a second opening / closing switch, a connecting wire having a contactor at its tip and connecting both ends of the first side to both ends of a portion where the resistance of the conductor is to be measured, respectively. A switch control unit that controls opening / closing of the first, second, and third opening / closing switches, and a voltage that measures a drop voltage of the first or second resistor in a predetermined control state of the first, second, and third opening / closing switches. It comprises a measuring section and an arithmetic processing section for calculating the resistance of the conductor from the voltage measured by the voltage measuring section.
【００１２】そしてまた、装置を検出部とこれと離れた
中央処理部とに分け、前記演算処理部を前記中央処理部
に設け、前記検出部と中央処理部にそれぞれ信号変換部
を設け、双方の信号変換部の間を光ファイバーケーブル
で接続して光により信号を伝達するように構成すること
もできる。Further, the apparatus is divided into a detection unit and a central processing unit separated from the detection unit, the arithmetic processing unit is provided in the central processing unit, and a signal conversion unit is provided in each of the detection unit and the central processing unit. It is also possible to connect the signal converters of the above with an optical fiber cable to transmit the signal by light.
【００１３】[0013]
【作 用】請求項１および２記載の電気抵抗測定方法に
あっては、導体に流れる交流電流により生ずる誘導起電
力を用いて測定するものであり、活線状態のままで導体
の抵抗測定ができ、しかも従来方法のごとく誘導起電力
により測定誤差が生ずることがない。[Operation] In the electric resistance measuring method according to claims 1 and 2, the measurement is performed using an induced electromotive force generated by an alternating current flowing through the conductor, and the resistance of the conductor can be measured in a live state. Moreover, unlike the conventional method, the measurement error does not occur due to the induced electromotive force.
【００１４】また、請求項３記載の電気抵抗測定装置に
あっては、装置を検出部と中央処理部に分けて離してい
るので、中央処理部を導体から離して設けることによ
り、演算処理部が導体近くの磁界等による悪影響を受け
にくい。Further, in the electric resistance measuring apparatus according to the third aspect, since the apparatus is separated into the detecting section and the central processing section, the central processing section is provided separately from the conductor, so that the arithmetic processing section is provided. Is less likely to be adversely affected by the magnetic field near the conductor.
【００１５】そしてまた、請求項４記載の電気抵抗測定
装置にあっては、検出部と中央処理部との間を光信号で
伝達するので、信号経路において信号に電気的雑音が重
畳することがない。しかも、高圧充電部の電流測定にお
いて、検出部と中央処理部を充分に離し得るとともに電
気的に絶縁でき、安全に抵抗測定をなし得る。Further, in the electrical resistance measuring apparatus according to the fourth aspect, since the optical signal is transmitted between the detecting section and the central processing section, electrical noise may be superimposed on the signal in the signal path. Absent. Moreover, in the current measurement of the high-voltage charging section, the detection section and the central processing section can be sufficiently separated and electrically insulated, and the resistance measurement can be safely performed.
【００１６】[0016]
【実施例】以下、本発明の電気抵抗測定方法の一実施例
を図１および図２を参照して説明する。図１は、本発明
の電気抵抗測定方法の原理を説明する図であり、図２
は、測定方法の手順を示すフローチャートである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electric resistance measuring method of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram for explaining the principle of the electric resistance measuring method of the present invention.
3 is a flowchart showing a procedure of a measuring method.
【００１７】まず、図１により原理を説明する。抵抗測
定の対象となる導体１０と同一平面上に、矩形の閉回路
１２を一辺を導体１０に平行として接近配設される。閉
回路１２の導体１０に近い側の第１の辺には、第１抵抗
Ｒ1と第１開閉スイッチｓｗ1が直列に介装される。ま
た、閉回路１２の導体１０に遠い側の第２の辺には、第
２抵抗Ｒ2と第２開閉スイッチｓｗ2が直列に介装され
る。さらに、第１の辺の両端が、導体１０の抵抗を測定
すべき箇所の両端に接続線１４，１４によりそれぞれ接
続される。接続線１４，１４の一方に第３開閉スイッチ
ｓｗ3が直列に介装される。なお、導体１０と閉回路１
２の第１の辺および接続線１４，１４で矩形の閉回路が
構成されることが望ましい。ここで、閉回路１２の第１
と第２抵抗Ｒ1，Ｒ2の抵抗値は同じで既知数である。ま
た、導体１０の測定すべき箇所の抵抗Ｒ0とそこを流れ
る交流電流Ｉおよび導体１０と閉回路１２の間の距離ｒ
は未知数である。First, the principle will be described with reference to FIG. On the same plane as the conductor 10 whose resistance is to be measured, a rectangular closed circuit 12 is arranged close to the conductor 10 with one side parallel to the conductor 10. A first resistor R 1 and a first opening / closing switch sw 1 are provided in series on the first side of the closed circuit 12 near the conductor 10. A second resistor R 2 and a second open / close switch sw 2 are provided in series on the second side of the closed circuit 12 on the side far from the conductor 10. Further, both ends of the first side are connected by connecting wires 14 and 14 to both ends of the portion where the resistance of the conductor 10 is to be measured. A third open / close switch sw 3 is provided in series with one of the connection lines 14 and 14. The conductor 10 and the closed circuit 1
It is desirable that the first closed side of 2 and the connecting lines 14 and 14 form a rectangular closed circuit. Here, the first of the closed circuit 12
And the resistance values of the second resistors R 1 and R 2 are the same and are known numbers. In addition, the resistance R 0 of the portion to be measured of the conductor 10, the alternating current I flowing therethrough, and the distance r between the conductor 10 and the closed circuit 12
Is an unknown number.
【００１８】そこで、まず第１と第２開閉スイッチｓｗ
1，ｓｗ2を閉じて、第３開閉スイッチｓｗ3を開く。す
ると、導体１０に流れる交流電流Ｉにより生ずる磁束
が、閉回路１２に鎖交して、閉回路１２に誘導起電力を
生じさせる。Therefore, first, the first and second open / close switches sw
1 and sw 2 are closed, and the third open / close switch sw 3 is opened. Then, the magnetic flux generated by the alternating current I flowing through the conductor 10 links the closed circuit 12 and causes the closed circuit 12 to generate an induced electromotive force.
【００１９】この誘導起電力により第２抵抗Ｒ2に生ず
る降下電圧ｖ2は数１と示される。The voltage drop v 2 generated in the second resistor R 2 by this induced electromotive force is expressed by the equation 1.
【数１】 さらに、Ｒ1＝Ｒ2であるから、数１は数２と示される。[Equation 1] Furthermore, since R 1 = R 2 , Equation 1 is expressed as Equation 2.
【数２】 ここでＩは実効値であり、μ0は真空透磁率であり、ｆ
は交流電流Ｉの周波数である。[Equation 2] Where I is the effective value, μ 0 is the vacuum permeability, and f
Is the frequency of the alternating current I.
【００２０】次に、第１と第３開閉スイッチｓｗ1，ｓ
ｗ3を閉じて、第２開閉スイッチｓｗ2を開く。すると、
導体１０と閉回路１２の第１の辺および接続線１４，１
４で形成される閉回路に、導体１０に流れる交流電流Ｉ
による磁束が鎖交して誘導起電力が生ずる。Next, the first and third open / close switches sw 1 and s
w 3 is closed and the second open / close switch sw 2 is opened. Then,
First side of conductor 10 and closed circuit 12 and connecting lines 14, 1
AC current I flowing through the conductor 10 in the closed circuit formed by 4
The magnetic flux due to the interlinkage causes an induced electromotive force.
【００２１】この誘導起電力により、第１抵抗Ｒ1に生
ずる降下電圧ｖ1′は、導体１０の抵抗Ｒ0が第１抵抗Ｒ
1に比べて充分に小さいとすれば、数３と示される。Due to this induced electromotive force, the voltage drop v 1 ′ generated in the first resistance R 1 is the resistance R 0 of the conductor 10 being the first resistance R 1.
If it is sufficiently smaller than 1 , it is shown as Equation 3.
【数３】 ここでは、導体１０の抵抗Ｒ0が第１抵抗Ｒ1に比べて充
分に小さいので、導体１０を流れる交流電流Ｉが第１抵
抗Ｒ1に分流する電流値も充分に小さいものとする。[Equation 3] Here, since the resistance R 0 of the conductor 10 is sufficiently smaller than the first resistance R 1 , it is assumed that the value of the AC current I flowing through the conductor 10 is also sufficiently small to be shunted to the first resistance R 1 .
【００２２】さらに、第２と第３開閉スイッチｓｗ2，
ｓｗ3を閉じて、第１開閉スイッチｓｗ1を開く。同様に
して生ずる誘導起電力による第２抵抗Ｒ2の降下電圧
ｖ2′は、数４と示される。Further, the second and third open / close switches sw 2 ,
The sw 3 is closed and the first open / close switch sw 1 is opened. The voltage drop v 2 ′ of the second resistor R 2 due to the induced electromotive force generated in the same manner is expressed by the equation 4.
【数４】 [Equation 4]
【００２３】そこで、Ｒ1＝Ｒ2としてｖ2′とｖ1′の差
を演算すると、数５と示される。Then, when R 1 = R 2 is set and the difference between v 2 ′ and v 1 ′ is calculated, the result is shown in Equation 5.
【数５】 この数５と数２とから数６が求められ、これを変形して
数７となる。[Equation 5] Equation 6 is obtained from Equation 5 and Equation 2, and is transformed into Equation 7.
【数６】 [Equation 6]
【数７】 数７において、Ｒ1は既知数であり、ｖ2，ｖ2′，ｖ1′
を測定して代入することで導体１０の抵抗Ｒ0の値が演
算できる。[Equation 7] In Equation 7, R 1 is a known number, and v 2 , v 2 ′, v 1 ′
The value of the resistance R 0 of the conductor 10 can be calculated by measuring and substituting.
【００２４】上記原理に基づいて、図２のごとき手順で
電気抵抗測定がなされる。まず、マイクロコンピュータ
等の演算処理部に予め、各演算式および第１と第２抵抗
Ｒ1，Ｒ2の抵抗値が設定される（ステップ）。そし
て、第１と第２開閉スイッチｓｗ1，ｓｗ2を閉じて、第
３開閉スイッチｓｗ3を開いて第２抵抗Ｒ2の降下電圧ｖ
2を測定して第１測定電圧を記憶する（ステップ）。
また、第１と第３開閉スイッチｓｗ1，ｓｗ3を閉じて、
第２開閉スイッチｓｗ2を開いて第１抵抗Ｒ1の降下電圧
ｖ1′を測定して第２測定電圧を記憶する（ステップ
）。さらに、第２と第３開閉スイッチｓｗ2，ｓｗ3を
閉じて、第１開閉スイッチｓｗ1を開いて第２抵抗Ｒ2の
降下電圧ｖ2′を測定して第３測定電圧を記憶する（ス
テップ）。そして、第３と第２測定電圧ｖ2′，ｖ1′
の差を演算し（ステップ）、さらにこの差（ｖ2′−
ｖ1′）と第１測定電圧ｖ2および第１抵抗Ｒ1の抵抗値
から数７により導体１０の抵抗Ｒ0の抵抗値を演算する
（ステップ）。最後に演算された導体１０の抵抗値を
表示部で適宜に表示する（ステップ）。上記測定手順
において、ステップ，，は、いずれが先であって
も良い。Based on the above principle, the electric resistance is measured in the procedure as shown in FIG. First, each arithmetic expression and the resistance values of the first and second resistors R 1 and R 2 are set in advance in an arithmetic processing unit such as a microcomputer (step). Then, the first and second opening / closing switches sw 1 and sw 2 are closed, the third opening / closing switch sw 3 is opened, and the voltage drop v of the second resistor R 2 is reached.
Measure 2 and store the first measured voltage (step).
Also, by closing the first and third open / close switches sw 1 and sw 3 ,
The second open / close switch sw 2 is opened, the voltage drop v 1 ′ of the first resistor R 1 is measured, and the second measured voltage is stored (step). Further, the second and third open / close switches sw 2 and sw 3 are closed, the first open / close switch sw 1 is opened, the voltage drop v 2 ′ of the second resistor R 2 is measured, and the third measured voltage is stored ( Step). Then, the third and second measurement voltages v 2 ′, v 1 ′
Is calculated (step), and this difference (v 2 ′ −
v 1 ′), the first measurement voltage v 2 and the resistance value of the first resistance R 1 are used to calculate the resistance value of the resistance R 0 of the conductor 10 (step). Finally, the calculated resistance value of the conductor 10 is appropriately displayed on the display unit (step). In the above measurement procedure, either step or may be first.
【００２５】次に、本発明の電気抵抗測定方法におい
て、別の演算方法について説明する。数３と数４とか
ら、ｖ2′，ｖ1′の比は、数８と示される。Next, another calculation method in the electric resistance measuring method of the present invention will be described. From Equations 3 and 4, the ratio of v 2 ′ and v 1 ′ is shown as Equation 8.
【数８】 ここで、閉回路１２の寸法ｌ1，ｌ2が既知数であれば、
ｖ2′，ｖ1′は第３と第２測定電圧から定まり、外挿法
等によって導体１０と閉回路１２の間の距離ｒが求ま
る。さらに、この距離ｒを、数２に代入すれば、ｖ2は
第１測定電圧から定まるので、導体１０に流れる交流電
流Ｉが求まる。そこで、この交流電流Ｉを数３または数
４に代入することで、導体１０の抵抗Ｒ0の抵抗値が演
算できる。[Equation 8] Here, if the dimensions l 1 and l 2 of the closed circuit 12 are known numbers,
v 2 ′ and v 1 ′ are determined from the third and second measured voltages, and the distance r between the conductor 10 and the closed circuit 12 is obtained by extrapolation or the like. Further, by substituting this distance r into the equation 2 , v 2 is determined from the first measured voltage, so that the AC current I flowing through the conductor 10 can be obtained. Therefore, the resistance value of the resistance R 0 of the conductor 10 can be calculated by substituting the alternating current I into the expression 3 or the expression 4.
【００２６】かかる本発明の電流測定方法にあっては、
送電線路や変電所設備の高圧の裸等の導体１０の接続部
等の測定すべき箇所の抵抗値を、活線状態で測定するこ
とができる。しかも、導体１０に流れる誘導起電力を用
いており、従来の測定方法のごとく誘導起電力による誤
差がなく、精度の良い測定が可能である。また、送電線
等にあっては、測定すべき１回線が停電状態であって
も、他回線が運転中であれば、かなりの大きな誘導電流
が一般的に流れており、この誘導電流を用いて測定が可
能である。さらに、閉回路１２の第１の辺が導体１０に
平行となるように接近させてこの第１の辺の両端を導体
１０の抵抗を測定すべき箇所の両端に接続すれば良く、
導体１０への接続操作が簡単であって作業性に優れ、遠
隔操作棒等を用いても容易に測定することができ実用上
その効果が著しい。また、電気抵抗の測定と同時に、導
体１０を流れる交流電流Ｉの測定も可能である。In the current measuring method of the present invention,
It is possible to measure the resistance value of a portion to be measured such as a connection portion of the conductor 10 such as a high-voltage bare wire of a transmission line or a substation facility in a live line state. Moreover, since the induced electromotive force flowing in the conductor 10 is used, there is no error due to the induced electromotive force as in the conventional measuring method, and accurate measurement is possible. In addition, in a power transmission line, even if one line to be measured is in a power failure state, if another line is in operation, a considerably large induced current generally flows. Can be measured. Furthermore, the first side of the closed circuit 12 may be brought close to the conductor 10 in parallel, and both ends of this first side may be connected to both ends of the portion where the resistance of the conductor 10 is to be measured.
The connection operation to the conductor 10 is simple and the workability is excellent, and the measurement can be easily performed even by using a remote control rod or the like, and the effect is remarkable in practical use. Further, it is possible to measure the AC current I flowing through the conductor 10 at the same time as measuring the electric resistance.
【００２７】さらに、上記電気抵抗測定方法の実施に用
いる電気抵抗測定装置につき、図３を参照して説明す
る。図３は、本発明の電気抵抗測定装置の一実施例のブ
ロック回路図である。Further, an electric resistance measuring device used for carrying out the electric resistance measuring method will be described with reference to FIG. FIG. 3 is a block circuit diagram of an embodiment of the electric resistance measuring apparatus of the present invention.
【００２８】図３において、矩形の閉回路１２が、導体
１０と同一平面上で、導体１０に近い側の第１の辺を平
行にして検出部２０に配設される。そして、この検出部
２０から導体１０の抵抗が測定される箇所の両端に接続
し得る接触子２２，２２が突設され、これらの接触子２
２，２２が閉回路１２の第１の辺の両端に接続線１４，
１４でそれぞれ接続される。接触子２２，２２の導体１
０への接続により、導体１０と閉回路１２の第１の辺と
接続線１４，１４により閉回路１２と同一平面上に矩形
の別の閉回路が形成される。そして、閉回路１２の第１
の辺と導体１０から遠い側の第２の辺および一方の接続
線１４は途中で切断され、ツイストペアまたは同軸ケー
ブル等を介して、それぞれスイッチ部２４に接続され
る。このスイッチ部２４の動作により、閉回路１２の第
１の辺の切断部の間は、開放または第１抵抗Ｒ1が介装
され、第２の辺の切断部の間は、開放または第１抵抗Ｒ
1と同じ抵抗値の第２抵抗Ｒ2が介装され、接続線１４の
切断部の間は、開放または短絡される。スイッチ部２４
は、スイッチ制御部２６により切り換え制御され、スイ
ッチ部２４の動作状態に応じて電圧測定部２８で第１ま
たは第２抵抗Ｒ1，Ｒ2の降下電圧が測定される。電圧測
定部２８から測定電圧に応じた電気信号が信号変換部３
０に与えられて光信号に変換され、光ファイバーケーブ
ル４０に出力される。また、光ファイバーケーブル４０
から信号変換部３０に与えられるスイッチ制御信号とし
ての光信号が、電気信号に変換されてスイッチ制御部２
６に与えられる。閉回路１２と接続線１４，１４と接触
子２２，２２とスイッチ部２４と第１と第２抵抗Ｒ1，
Ｒ2とスイッチ制御部２６と電圧測定部２８および信号
変換部３０を含んで、検出部２０が構成される。In FIG. 3, a rectangular closed circuit 12 is arranged in the detection unit 20 on the same plane as the conductor 10 with the first side closer to the conductor 10 parallel. Then, contacts 22 which can be connected to both ends of the location where the resistance of the conductor 10 is measured are projected from the detection unit 20, and these contacts 2 are provided.
2, 22 are connection lines 14 at both ends of the first side of the closed circuit 12,
14 are connected respectively. Conductor 1 of the contacts 22,22
By connecting to 0, the conductor 10 and the first side of the closed circuit 12 and the connecting lines 14 and 14 form another rectangular closed circuit on the same plane as the closed circuit 12. Then, the first of the closed circuit 12
And the second side on the side farther from the conductor 10 and one of the connecting wires 14 are cut in the middle and connected to the switch section 24 via a twisted pair or a coaxial cable or the like. By the operation of the switch unit 24, the open circuit or the first resistor R 1 is interposed between the first side cutting sections of the closed circuit 12, and the second circuit cutting section is opened or the first resistance R 1 is interposed. Resistance R
The second resistor R 2 having the same resistance value as that of 1 is interposed, and the cut portion of the connection line 14 is opened or short-circuited. Switch part 24
Is controlled to be switched by the switch control unit 26, and the voltage drop of the first or second resistor R 1 or R 2 is measured by the voltage measuring unit 28 according to the operating state of the switch unit 24. An electric signal corresponding to the measured voltage is output from the voltage measuring unit 28 to the signal converting unit 3
0 is converted to an optical signal and output to the optical fiber cable 40. Also, the optical fiber cable 40
The optical signal as the switch control signal provided from the signal converter 30 to the signal converter 30 is converted into an electrical signal and the switch controller 2
Given to 6. The closed circuit 12, the connecting wires 14 and 14, the contacts 22 and 22, the switch section 24, the first and second resistors R 1 ,
The detection unit 20 is configured by including the R 2 , the switch control unit 26, the voltage measurement unit 28, and the signal conversion unit 30.
【００２９】また、検出部２０から分けて離して設けら
れる中央処理部５０には、光ファイバーケーブル４０に
接続される信号変換部５２が設けられ、検出部２０から
の測定電圧に応じた光信号が電気信号に再変換されて演
算処理部５４に与えられる。また、制御部５６からスイ
ッチ制御信号としての電気信号が信号変換部５２に与え
られて、光信号に変換されて光ファイバーケーブル４０
に与えられて検出部２０に出力される。マイクロコンピ
ュータ等を用いた演算処理部５４には、上述の電気抵抗
測定方法を実施するのに必要な演算式およびデータが予
め設定されており、測定電圧が与えられると適宜に導体
１０の抵抗Ｒ0を演算し、これが適宜に表示部５８で表
示されるとともに記憶部６０に記憶される。信号変換部
５２と演算処理部５４と制御部５６と表示部５８および
記憶部６０を含んで、中央処理部５０が構成される。The central processing unit 50, which is provided separately from the detection unit 20, is provided with a signal conversion unit 52 connected to the optical fiber cable 40, and an optical signal corresponding to the measured voltage from the detection unit 20 is provided. It is converted back into an electric signal and given to the arithmetic processing unit 54. Further, an electric signal as a switch control signal is given from the control unit 56 to the signal conversion unit 52, converted into an optical signal, and then the optical fiber cable 40.
Is output to the detection unit 20. The arithmetic processing unit 54 using a microcomputer or the like is preset with arithmetic expressions and data required to carry out the above-described electric resistance measuring method, and the resistance R of the conductor 10 is appropriately set when a measurement voltage is applied. 0 is calculated, and this is appropriately displayed on the display unit 58 and stored in the storage unit 60. The central processing unit 50 includes the signal conversion unit 52, the arithmetic processing unit 54, the control unit 56, the display unit 58, and the storage unit 60.
【００３０】検出部２０と中央処理部５０に、それぞれ
駆動用の電源（図示せず）が内蔵されている。また、検
出部２０にあっては磁束と鎖交するようにコイルを設
け、このコイルに生ずる誘導起電力を駆動電源として利
用しても良い。A power supply (not shown) for driving is built in each of the detection unit 20 and the central processing unit 50. Further, in the detection unit 20, a coil may be provided so as to interlink with the magnetic flux, and the induced electromotive force generated in this coil may be used as a drive power source.
【００３１】かかる構成にあっては、導体１０に生じる
磁界に晒される検出部２０と、測定電圧を演算処理する
中央処理部５０を分けて離して設けることで、中央処理
部５０に対する磁界の影響が少なく、演算処理において
誤動作する虞がなく、測定精度の向上に寄与し得る。そ
して、検出部２０と中央処理部５０との間を、光ファイ
バーケーブル４０を介装して光信号で伝達するので、こ
の信号の伝達経路で電気的雑音が重畳されることがな
く、測定精度を向上させ得る。しかも、検出部２０と中
央処理部５０を分けることで、遠隔操作棒等を用いる場
合に、遠隔操作棒の先端に装置全体より軽量な検出部２
０を設ければ良く、それだけ操作性に優れたものとな
る。また、検出部２０と中央処理部５０を充分に離すと
ともに電気的に絶縁でき、安全に抵抗測定をなし得る。In such a structure, the influence of the magnetic field on the central processing unit 50 is provided by separately providing the detection unit 20 exposed to the magnetic field generated in the conductor 10 and the central processing unit 50 for calculating the measured voltage. Is small, there is no possibility of malfunction in arithmetic processing, and it can contribute to improvement of measurement accuracy. Then, since the optical signal is transmitted between the detection unit 20 and the central processing unit 50 via the optical fiber cable 40, electrical noise is not superimposed on the transmission path of this signal, and measurement accuracy is improved. Can improve. Moreover, by separating the detection unit 20 and the central processing unit 50, when a remote control rod or the like is used, the detection unit 2 that is lighter than the entire device at the tip of the remote control rod is used.
It is sufficient to provide 0, and the operability is excellent. Further, the detection unit 20 and the central processing unit 50 can be sufficiently separated from each other and can be electrically insulated, so that the resistance can be measured safely.
【００３２】なお、上記電気抵抗測定方法において、第
３と第２測定電圧ｖ2′，ｖ1′の差（ｖ2′−ｖ1′）を
用いる演算方法にあっては、導体１０と閉回路１２の第
１の辺および接続線１４，１４で形成する閉回路は、矩
形でなくても良い。また、実施例では、閉回路１２と導
体１０を接続する接続線１４，１４の一方に第３開閉ス
イッチｓｗ3を直列に介装したが、双方に連動する開閉
スイッチをそれぞれ直列に介装しても良いことは勿論で
ある。Incidentally, in the above-mentioned electric resistance measuring method, in the calculation method using the difference (v 2 ′ −v 1 ′) between the third and second measured voltages v 2 ′ and v 1 ′, the conductor 10 and the closed The closed circuit formed by the first side of the circuit 12 and the connecting lines 14, 14 does not have to be rectangular. Further, in the embodiment, the third open / close switch sw 3 is provided in series on one of the connection lines 14 and 14 connecting the closed circuit 12 and the conductor 10. However, open / close switches interlocking with both are provided in series. Of course, it is okay.
【００３３】[0033]
【発明の効果】以上説明したところから明らかなよう
に、請求項１および２記載の本発明の電気抵抗測定方法
にあっては、いずれも抵抗測定の対象となる導体を活線
状態のままで測定を行なうことができる。しかも、導線
に流れる交流電流による誘導起電力等のために測定に誤
りを生ずることがない。また、導体に対して一側方から
接続させれば良く、操作が簡単であって、遠隔操作棒等
による作業に好適である。As is apparent from the above description, in the electric resistance measuring method of the present invention as set forth in claims 1 and 2, the conductor to be measured for resistance is kept in a live state. The measurement can be performed. Moreover, there is no error in the measurement due to the induced electromotive force or the like due to the alternating current flowing through the conductor. Further, the conductor may be connected from one side, the operation is simple, and it is suitable for work by a remote control rod or the like.
【００３４】また、請求項３記載の本発明の電気抵抗測
定装置にあっては、検出部と中央処理部を分けること
で、中央処理部を導体に生ずる磁界の影響のない位置に
配設することができ、それだけ演算処理に雑音が混入し
て誤った演算がなされる虞がなく、測定結果の信頼性が
高いものとなる。また、装置全体に比べて検出部が軽量
となり、遠隔操作棒等による操作が容易となる。Further, in the electric resistance measuring apparatus of the present invention as defined in claim 3, the detecting section and the central processing section are separated so that the central processing section is arranged at a position where the magnetic field generated in the conductor is not affected. Therefore, there is no possibility that noise will be mixed in the calculation process and an incorrect calculation will be performed, and the reliability of the measurement result will be high. Further, the detection unit is lighter in weight than the entire apparatus, and the operation with a remote control rod or the like becomes easy.
【００３５】そしてまた、請求項４記載の電気抵抗測定
装置にあっては、検出部と中央処理部との間を光信号で
伝達するので、伝達経路で信号に電気的雑音が重畳され
ることがなく、測定結果の精度が高いものとなる。しか
も、中央処理部を検出部から充分に離すとともに電気的
に絶縁でき、安全に抵抗測定を行なうことができる。Further, in the electrical resistance measuring apparatus according to the present invention, since the optical signal is transmitted between the detecting section and the central processing section, electrical noise is superimposed on the signal in the transmission path. Therefore, the accuracy of the measurement result is high. Moreover, the central processing unit can be sufficiently separated from the detection unit and can be electrically insulated, so that the resistance can be measured safely.
【図１】本発明の電気抵抗測定方法の原理を説明する図
である。FIG. 1 is a diagram illustrating the principle of an electric resistance measuring method of the present invention.
【図２】測定方法の手順を示すフローチャートである。FIG. 2 is a flowchart showing a procedure of a measuring method.
【図３】本発明の電気抵抗測定装置の一実施例のブロッ
ク回路図である。FIG. 3 is a block circuit diagram of an embodiment of an electric resistance measuring apparatus of the present invention.
【符号の説明】 １０ 導体 １２ 閉回路 １４ 接続線 ２０ 検出部 ２２ 接触子 ２４ スイッチ部 ２６ スイッチ制御部 ２８ 電圧測定部 ３０，５２ 信号変換部 ４０ 光ファイバーケーブル ５０ 中央処理部 ５４ 演算処理部 ５６ 制御部 ５８ 表示部[Explanation of symbols] 10 conductor 12 closed circuit 14 connection wire 20 detection unit 22 contactor 24 switch unit 26 switch control unit 28 voltage measurement unit 30, 52 signal conversion unit 40 optical fiber cable 50 central processing unit 54 arithmetic processing unit 56 control unit 58 display
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年２月１６日[Submission date] February 16, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【書類名】 明細書[Document name] Statement
【発明の名称】 電気抵抗測定方法および電気抵抗測
定装置Title: Electric resistance measuring method and electric resistance measuring apparatus
【特許請求の範囲】[Claims]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、接続部等の導体の抵抗
を、交流電流が流れる活線状態で測定できるようにした
電気抵抗測定方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric resistance measuring method capable of measuring the resistance of a conductor such as a connecting portion in a live state where an alternating current flows.
【０００２】また、上記電気抵抗測定方法を用いて導体
の抵抗を測定するための電気抵抗測定装置に関するもの
である。The present invention also relates to an electric resistance measuring device for measuring the resistance of a conductor by using the above electric resistance measuring method.
【０００３】[0003]
【従来の技術】導体の抵抗を測定する従来の方法の１つ
として、導体を停電状態として、抵抗測定すべき箇所の
両端に電流印加用端子と電圧測定用端子をそれぞれ設
け、測定箇所に所定直流電流を外部から印加し、この直
流電流による電圧降下を測定し、電流と電圧から抵抗値
を算出するものが知られている。2. Description of the Related Art As one of the conventional methods for measuring the resistance of a conductor, a conductor is put into a power failure state, and a current application terminal and a voltage measurement terminal are provided at both ends of a location where resistance is to be measured, and a predetermined measurement location is provided. It is known that a direct current is applied from the outside, the voltage drop due to this direct current is measured, and the resistance value is calculated from the current and the voltage.
【０００４】また、活線状態のまま導体の抵抗を測定す
る方法としては、測定すべき箇所の両端に電圧測定用端
子を設け、導体に流れる交流電流をクランプメータ等で
測定し、導体に流れる交流電流による電圧降下を測定し
て抵抗値を算出するものがある。Further, as a method of measuring the resistance of a conductor in a live state, voltage measuring terminals are provided at both ends of a portion to be measured, an alternating current flowing through the conductor is measured by a clamp meter or the like, and the current is passed through the conductor. There is one that calculates a resistance value by measuring a voltage drop due to an alternating current.
【０００５】[0005]
【発明が解決しようとする課題】上記した従来の停電状
態として導体の抵抗を測定する方法にあっては、測定用
端子を導体に接続する部分の抵抗が測定結果に大きな影
響を与え、誤差が大きい。また、送電線路や変電所設備
等の高圧の裸導体を停電状態とすれば、電力供給等に対
する影響が極めて大きく、実際問題として容易には測定
することができない。そこで、送電線路の新規な装架や
交換等の際に用いることができるにすぎない。In the conventional method of measuring the resistance of the conductor in the power failure state as described above, the resistance of the portion connecting the measuring terminal to the conductor has a great influence on the measurement result, and the error is large. Further, if a high-voltage bare conductor such as a power transmission line or a substation facility is put into a power failure state, it has a great influence on power supply and the like, and cannot be easily measured as a practical problem. Therefore, it can only be used for new mounting or replacement of the transmission line.
【０００６】また、上記した活線状態のまま導体の抵抗
を測定する方法にあっては、測定すべき抵抗による電圧
降下を正確に測定することができず、測定誤差が大き
い。これは、導体と電圧降下を測定するための回路によ
り１つの閉回路が形成され、この閉回路に導体を流れる
交流電流により導体の回りに生じる磁束によって誘導起
電力が生じ、この誘導起電力に電圧降下が加わった電圧
が測定されるためである。特に、導体の抵抗が小さけれ
ば誘導起電力に対して相対的に抵抗による電圧降下が小
さく、誤差も大きなものとなる。Further, in the method of measuring the resistance of the conductor in the above-described live state, the voltage drop due to the resistance to be measured cannot be accurately measured, and the measurement error is large. This is because one closed circuit is formed by a conductor and a circuit for measuring a voltage drop, and an induced electromotive force is generated by a magnetic flux generated around the conductor by an alternating current flowing through the conductor in the closed circuit. This is because the voltage including the voltage drop is measured. In particular, if the resistance of the conductor is small, the voltage drop due to the resistance is small relative to the induced electromotive force, and the error is large.
【０００７】したがって、活線状態のままで、導体の抵
抗を正確に測定できる電気抵抗測定方法およびそのため
の装置が要望されていた。Therefore, there has been a demand for an electric resistance measuring method and an apparatus therefor capable of accurately measuring the resistance of a conductor in a live state.
【０００８】本発明は、上記のごとき従来方法の事情に
鑑みてなされたもので、活線状熊のままで導体の抵抗を
正確に測定し得る電気抵抗測定方法および電気抵抗測定
装置を提供することを目的とする。The present invention has been made in view of the circumstances of the conventional method as described above, and provides an electric resistance measuring method and an electric resistance measuring apparatus capable of accurately measuring the resistance of a conductor with a live wire bear. The purpose is to
【０００９】[0009]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明の電気抵抗測定方法は、矩形の閉回路を、
抵抗測定の対象となる導体と同一平面上で一辺を前記導
体と平行にして接近させ、前記閉回路の前記導体と平行
で近い側の第１の辺に第１抵抗と第１開閉スイッチを直
列に介装し、前記閉回路の前記導体と平行で遠い側の第
２の辺に前記第１抵抗と同じ値の第２抵抗と第２開閉ス
イッチを直列に介装し、前記第１の辺の両端を前記導体
の抵抗を測定すべき箇所の両端にそれぞれ接続線で接続
し、これらの接続線のすくなくとも一方に第３開閉スイ
ッチを直列に介装し、前記第１と第２開閉スイッチを閉
じて、前記第３開閉スイッチを開いて前記第１または第
２抵抗の電圧降下を測定して第１測定電圧となし、前記
第１と第３開閉スイッチを閉じて、前記第２開閉スイッ
チを開いて前記第１抵抗の電圧降下を測定して第２測定
電圧となし、前記第２と第３開閉スイッチを閉じて、前
記第１開閉スイッチを開いて前記第２抵抗の電圧降下を
測定して第３測定電圧となし、前記第２と第３測定電圧
の差電圧と、前記第１測定電圧とから、前記導体の抵抗
が演算される。In order to achieve the above object, the electric resistance measuring method of the present invention comprises a rectangular closed circuit,
On the same plane as the conductor whose resistance is to be measured, one side is made parallel to and close to the conductor, and the first resistance and the first opening / closing switch are connected in series to the first side of the closed circuit that is close to and parallel to the conductor. A second resistor having the same value as the first resistor and a second open / close switch in series on a second side of the closed circuit that is parallel to the conductor and is on the far side. Both ends of the conductor are respectively connected to both ends of the portion where the resistance of the conductor is to be measured, and a third open / close switch is connected in series to at least one of these connection lines to connect the first and second open / close switches. Closed, the third open / close switch is opened to measure the voltage drop of the first or second resistor to obtain the first measured voltage, and the first and third open / close switches are closed to open the second open / close switch. Open to measure the voltage drop across the first resistor to form the second measured voltage, 2 and the third opening / closing switch are closed, the first opening / closing switch is opened, and the voltage drop of the second resistor is measured to be a third measurement voltage, and the difference voltage between the second and third measurement voltages, The resistance of the conductor is calculated from the first measured voltage.
【００１０】そして、前記第１の辺と前記導体の抵抗を
測定すべき箇所とこれらを接続する前記接続線で矩形閉
回路を形成し、前記第２と第３測定電圧の差電圧に代え
て、前記第２と第３測定電圧の比から前記導体と前記第
１の辺の間の距離を演算し、この距離と前記第１測定電
圧から前記導体の抵抗を演算しても良い。Then, a rectangular closed circuit is formed by the first side, the portion where the resistance of the conductor is to be measured, and the connecting line connecting these, and instead of the differential voltage between the second and third measured voltages. The distance between the conductor and the first side may be calculated from the ratio of the second and third measurement voltages, and the resistance of the conductor may be calculated from this distance and the first measurement voltage.
【００１１】また、本発明の電気抵抗測定装置は、抵抗
測定の対象となる導体に、同一平面上で一辺を前記導体
と平行にして接近させる矩形の閉回路と、前記閉回路の
前記導体と平行で近い側の第１の辺に直列に介装された
第１抵抗と第１開閉スイッチと、前記閉回路の前記導体
と平行で遠い側の第２の辺に直列に介装された前記第１
抵抗と同じ値の第２抵抗と第２開閉スイッチと、先端に
接触子を有し前記第１の辺の両端を前記導体の抵抗を測
定すべき箇所の両端にそれぞれ接続する接続線と、前記
第１と第２と第３開閉スイッチを開閉制御するスイッチ
制御部と、前記第１と第２と第３開閉スイッチの所定の
制御状態で前記第１または第２抵抗の電圧降下を測定す
る電圧測定部と、この電圧測定部による測定電圧から前
記導体の抵抗を演算する演算処理部と、を備えて構成さ
れている。Further, the electric resistance measuring apparatus of the present invention comprises: a rectangular closed circuit for approaching a conductor whose resistance is to be measured with one side parallel to the conductor on the same plane; and the conductor of the closed circuit. The first resistor and the first opening / closing switch which are inserted in series on the first side on the parallel and near side, and the first resistor and the first opening / closing switch which are inserted on the second side on the far side in parallel with the conductor of the closed circuit in series. First
A second resistance having the same value as the resistance, a second opening / closing switch, a connecting wire having a contactor at its tip and connecting both ends of the first side to both ends of a portion where the resistance of the conductor is to be measured, respectively. A switch control unit for controlling opening / closing of the first, second and third opening / closing switches, and a voltage for measuring a voltage drop of the first or second resistor in a predetermined control state of the first, second and third opening / closing switches. It comprises a measuring section and an arithmetic processing section for calculating the resistance of the conductor from the voltage measured by the voltage measuring section.
【００１２】そしてまた、装置を検出部とこれと離れた
中央処理部とに分け、前記演算処理部を前記中央処理部
に設け、前記検出部と中央処理部にそれぞれ信号変換部
を設け、双方の信号変換部の間を光ファイバーケーブル
で接続して光により信号を伝達するように構成すること
もできる。Further, the apparatus is divided into a detection unit and a central processing unit separated from the detection unit, the arithmetic processing unit is provided in the central processing unit, and a signal conversion unit is provided in each of the detection unit and the central processing unit. It is also possible to connect the signal converters of the above with an optical fiber cable to transmit the signal by light.
【００１３】[0013]
【作 用】請求項１および２記載の電気抵抗測定方法に
あっては、導体に流れる交流電流により生ずる誘導起電
力を用いて測定するものであり、活線状態のままで導体
の抵抗測定ができ、しかも従来方法のごとく誘導起電力
により測定誤差が生ずることがない。[Operation] In the electric resistance measuring method according to claims 1 and 2, the measurement is performed using an induced electromotive force generated by an alternating current flowing through the conductor, and the resistance of the conductor can be measured in a live state. Moreover, unlike the conventional method, the measurement error does not occur due to the induced electromotive force.
【００１４】また、請求項３記載の電気抵抗測定装置に
あっては、装置を検出部と中央処理部に分けて離してい
るので、中央処理部を導体から離して設けることによ
り、演算処理部が導体近くの磁界等による悪影響を受け
にくい。Further, in the electric resistance measuring apparatus according to the third aspect, since the apparatus is separated into the detecting section and the central processing section, the central processing section is provided separately from the conductor, so that the arithmetic processing section is provided. Is less likely to be adversely affected by the magnetic field near the conductor.
【００１５】そしてまた、請求項４記載の電気抵抗測定
装置にあっては、検出部と中央処理部との間を光信号で
伝達するので、信号経路において信号に電気的雑音が重
畳することがない。しかも、高圧充電部の電流測定にお
いて、検出部と中央処理部を充分に離し得るとともに電
気的に絶縁でき、安全に抵抗測定をなし得る。Further, in the electrical resistance measuring apparatus according to the fourth aspect, since the optical signal is transmitted between the detecting section and the central processing section, electrical noise may be superimposed on the signal in the signal path. Absent. Moreover, in the current measurement of the high-voltage charging section, the detection section and the central processing section can be sufficiently separated and electrically insulated, and the resistance measurement can be safely performed.
【００１６】[0016]
【実施例】以下、本発明の電気抵抗測定方法の一実施例
を図１および図２を参照して説明する。図１は、本発明
の電気抵抗測定方法の原理を説明する図であり、図２
は、測定方法の手順を示すフローチャートである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electric resistance measuring method of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram for explaining the principle of the electric resistance measuring method of the present invention.
3 is a flowchart showing a procedure of a measuring method.
【００１７】まず、図１により原理を説明する。抵抗測
定の対象となる導体１０と同一平面上に、矩形の閉回路
１２を一辺を導体１０に平行として接近配設される。閉
回路１２の導体１０に近い側の第１の辺には、第１抵抗
Ｒ１と第１開閉スイッチｓｗ１が直列に介装される。ま
た、閉回路１２の導体１０に遠い側の第２の辺には、第
２抵抗Ｒ２と第２開閉スイッチｓｗ２が直列に介装され
る。さらに、第１の辺の両端が、導体１０の抵抗を測定
すべき箇所の両端に接続線１４，１４によりそれぞれ接
続される。接続線１４，１４の一方に第３開閉スイッチ
ｓｗ３が直列に介装される。なお、導体１０と閉回路１
２の第１の辺および接続線１４，１４で矩形の閉回路が
構成されることが望ましい。ここで、閉回路１２の第１
と第２抵抗Ｒ１，Ｒ２の抵抗値は同じで既知数である。
また、導体１０の測定すべき箇所の抵抗Ｒ０とそこを流
れる交流電流ｉおよび導体１０と閉回路１２の間の距離
ｒは未知数である。First, the principle will be described with reference to FIG. On the same plane as the conductor 10 whose resistance is to be measured, a rectangular closed circuit 12 is arranged close to the conductor 10 with one side parallel to the conductor 10. A first resistor R 1 and a first opening / closing switch sw 1 are provided in series on the first side of the closed circuit 12 near the conductor 10. Further, a second resistor R 2 and a second open / close switch sw 2 are provided in series on the second side of the closed circuit 12 on the side far from the conductor 10. Further, both ends of the first side are connected by connecting wires 14 and 14 to both ends of the portion where the resistance of the conductor 10 is to be measured. The third open / close switch sw 3 is provided in series with one of the connection lines 14 and 14. The conductor 10 and the closed circuit 1
It is desirable that the first closed side of 2 and the connecting lines 14 and 14 form a rectangular closed circuit. Here, the first of the closed circuit 12
And the resistance values of the second resistors R 1 and R 2 are the same and are known numbers.
Further, the resistance R 0 of the portion of the conductor 10 to be measured, the alternating current i flowing therethrough, and the distance r between the conductor 10 and the closed circuit 12 are unknowns.
【００１８】そこで、まず第１と第２開閉スイッチｓｗ
１，ｓｗ２を閉じて、第３開閉スイッチｓｗ３を開く。
すると、導体１０に流れる交流電流ｉにより生ずる磁束
が、閉回路１２に鎖交して、閉回路１２に誘導起電力を
生じさせる。Therefore, first, the first and second open / close switches sw
1 and sw 2 are closed, and the third open / close switch sw 3 is opened.
Then, the magnetic flux generated by the alternating current i flowing through the conductor 10 links the closed circuit 12 to generate an induced electromotive force in the closed circuit 12.
【００１９】この誘導起電力により第２抵抗Ｒ２に生ず
る電圧降下Ｖ２は数１と示される。The voltage drop V 2 generated in the second resistor R 2 by this induced electromotive force is expressed by the equation 1.
【数１】 さらに、Ｒ１＝Ｒ２であるから、数１は数２と示され
る。[Equation 1] Furthermore, since R 1 = R 2 , Formula 1 is expressed as Formula 2.
【数２】 ここでＩは交流電流ｉの実効値であり、μ０は真空透磁
率であり、ｆは交流電流ｉの周波数である。[Equation 2] Here, I is the effective value of the alternating current i, μ 0 is the vacuum permeability, and f is the frequency of the alternating current i.
【００２０】次に、第１と第３開閉スイッチｓｗ１，ｓ
ｗ３を閉じて、第２開閉スイッチｓｗ２を開く。する
と、導体１０と閉回路１２の第１の辺および接続線１
４，１４で形成される閉回路に、導体１０に流れる交流
電流ｉによる磁束が鎖交して誘導起電力が生ずる。Next, the first and third open / close switches sw 1 , s
The second opening / closing switch sw 2 is opened by closing w 3 . Then, the conductor 10 and the first side of the closed circuit 12 and the connecting line 1
In the closed circuit formed by 4 and 14, the magnetic flux due to the alternating current i flowing through the conductor 10 is linked to generate an induced electromotive force.
【００２１】この誘導起電力により、第１抵抗Ｒ１に生
ずる電圧降下ｖ１′は、導体１０の抵抗Ｒ０が第１抵抗
Ｒ１に比べて充分に小さいとすれば、数３と示される。[0021] By this induced electromotive force, voltage drop v 1 generated in the first resistor R 1 ', if the resistance R 0 of the conductor 10 is sufficiently small as compared with the first resistor R 1, indicated as number 3 .
【数３】 ここでは、導体１０の抵抗Ｒ０が第１抵抗Ｒ１に比べて
充分に小さいので、導体１０を流れる交流電流ｉが第１
抵抗Ｒ１に分流する電流値も充分に小さいものとする。[Equation 3] Here, the resistance R 0 of the conductor 10 is sufficiently smaller than the first resistance R 1 , so that the alternating current i flowing through the conductor 10 is the first
The value of the current shunted to the resistor R 1 is also sufficiently small.
【００２２】さらに、第２と第３開閉スイッチｓｗ２，
ｓｗ３を閉じて、第１開閉スイッチｓｗ１を開く。同様
にして生ずる誘導起電力による第２抵抗Ｒ２の電圧降下
ｖ２′は、数４と示される。Further, the second and third open / close switches sw 2 ,
The sw 3 is closed and the first open / close switch sw 1 is opened. The voltage drop v 2 ′ of the second resistor R 2 due to the induced electromotive force generated in the same manner is represented by Formula 4.
【数４】 [Equation 4]
【００２３】そこで、Ｒ１＝Ｒ２としてｖ２′とｖ１′
の差を演算すると、数５と示される。Therefore, R 1 = R 2 and v 2 ′ and v 1 ′ are set.
When the difference between the two is calculated, it is shown as Equation 5.
【数５】 この数５と数２とから数６が求められ、これを変形して
数７となる。[Equation 5] Equation 6 is obtained from Equation 5 and Equation 2, and is transformed into Equation 7.
【数６】 [Equation 6]
【数７】 数７において、Ｒ１は既知数であり、ｖ２，ｖ２′，ｖ
１′を測定して代入することで導体１０の抵抗Ｒ０の値
が演算できる。[Equation 7] In Equation 7, R 1 is a known number, and v 2 , v 2 ′, v
The value of the resistance R 0 of the conductor 10 can be calculated by measuring and substituting 1 ′.
【００２４】上記原理に基づいて、図２のごとき手順で
電気抵抗測定がなされる。まず、マイクロコンピュータ
等の演算処理部に予め、各演算式および第１と第２抵抗
Ｒ１，Ｒ２の抵抗値が設定される（ステップ）。そし
て、第１と第２開閉スイッチｓｗ１，ｓｗ２を閉じて、
第３開閉スイッチｓｗ３を開いて第２抵抗Ｒ２の電圧降
下ｖ２を測定して第１測定電圧を記憶する（ステップ
）。また、第１と第３開閉スイッチｓｗ１，ｓｗ３を
閉じて、第２開閉スイッチｓｗ２を開いて第１抵抗Ｒ１
の電圧降下ｖ１′を測定して第２測定電圧を記憶する
（ステップ）。さらに、第２と第３開閉スイッチｓｗ
２，ｓｗ３を閉じて、第１開閉スイッチｓｗ１を開いて
第２抵抗Ｒ２の電圧降下ｖ２′を測定して第３測定電圧
を記憶する（ステップ）。そして、第３と第２測定電
圧ｖ２′，ｖ１′の差を演算し（ステップ）、さらに
この差（ｖ２′−ｖ１′）と第１測定電圧ｖ２および第
１抵抗Ｒ１の抵抗値から数７により導体１０の抵抗Ｒ０
の抵抗値を演算する（ステップ）。最後に演算された
導体１０の抵抗値を表示部で適宜に表示する（ステップ
）。上記測定手順において、ステップ，，は、
いずれが先であっても良い。Based on the above principle, the electric resistance is measured in the procedure as shown in FIG. First, each arithmetic expression and the resistance values of the first and second resistors R 1 and R 2 are set in advance in an arithmetic processing unit such as a microcomputer (step). Then, the first and second open / close switches sw 1 and sw 2 are closed,
The third voltage drop v 2 of open closing switch sw 3 second resistor R 2 for storing a first measurement voltage measured (step). In addition, the first and third open / close switches sw 1 and sw 3 are closed, and the second open / close switch sw 2 is opened to open the first resistor R 1
The voltage drop v 1 ′ of the second measurement voltage is measured and the second measurement voltage is stored (step). Further, the second and third open / close switches sw
2 and sw 3 are closed, the first open / close switch sw 1 is opened, the voltage drop v 2 ′ of the second resistor R 2 is measured, and the third measured voltage is stored (step). Then, the difference between the third and second measurement voltages v 2 ′ and v 1 ′ is calculated (step), and the difference (v 2 ′ −v 1 ′), the first measurement voltage v 2 and the first resistance R 1 are calculated. The resistance R 0 of the conductor 10 is calculated from the resistance value of
The resistance value of is calculated (step). Finally, the calculated resistance value of the conductor 10 is appropriately displayed on the display unit (step). In the above measurement procedure,
Whichever comes first.
【００２５】次に、本発明の電気抵抗測定方法におい
て、別の演算方法について説明する。数３と数４とか
ら、ｖ２′，ｖ１′の比は、数８と示される。Next, another calculation method in the electric resistance measuring method of the present invention will be described. From Equation 3 and Equation 4, the ratio of v 2 ′ and v 1 ′ is shown as Equation 8.
【数８】 ここで、閉回路１２の寸法ｌ１，ｌ２が既知数であれ
ば、ｖ２′，ｖ１′は第３と第２測定電圧から定まり、
外挿法等によって導体１０と閉回路１２の間の距離ｒが
求まる。さらに、この距離ｒを、数２に代入すれば、ｖ
２は第１測定電圧から定まるので、導体１０に流れる交
流電流ｉの実効値Ｉが求まる。そこで、この実効値Ｉを
数３または数４に代入することで、導体１０の抵抗Ｒ０
の抵抗値が演算できる。[Equation 8] Here, if the dimensions l 1 and l 2 of the closed circuit 12 are known numbers, v 2 ′ and v 1 ′ are determined from the third and second measurement voltages,
The distance r between the conductor 10 and the closed circuit 12 can be obtained by extrapolation or the like. Further, by substituting this distance r into Equation 2, v
Since 2 is determined from the first measurement voltage, the effective value I of the alternating current i flowing through the conductor 10 can be obtained. Therefore, by substituting this effective value I into Equation 3 or Equation 4, the resistance R 0 of the conductor 10 is reduced.
The resistance value of can be calculated.
【００２６】かかる本発明の電気抵抗測定方法にあって
は、送電線路や変電所設備の高圧の裸等の導体１０の接
続部等の測定すべき箇所の抵抗値を、活線状態で測定す
ることができる。しかも、導体１０に流れる誘導起電力
を用いており、従来の測定方法のごとく誘導起電力によ
る誤差がなく、精度の良い測定が可能である。また、送
電線等にあっては、測定すべき１回線が停電状熊であっ
ても、他回線が運転中であれば、かなりの大きな誘導電
流が一般的に流れており、この誘導電流を用いて測定が
可能である。さらに、閉回路１２の第１の辺が導体１０
に平行となるように接近させてこの第１の辺の両端を導
体１０の抵抗を測定すべき箇所の両端に接続すれば良
く、導体１０への接続操作が簡単であって作業性に優
れ、遠隔操作棒等を用いても容易に測定することができ
実用上その効果が著しい。また、電気抵抗の測定と同時
に、導体１０を流れる交流電流ｉの実効値Ｉの測定も可
能である。In the electric resistance measuring method of the present invention, the resistance value of a portion to be measured such as a connection portion of the conductor 10 such as a high voltage bare wire of a transmission line or a substation equipment is measured in a live state. be able to. Moreover, since the induced electromotive force flowing in the conductor 10 is used, there is no error due to the induced electromotive force as in the conventional measuring method, and accurate measurement is possible. In addition, in the case of power transmission lines, even if one line to be measured is a power failure bear, if the other line is operating, a fairly large induced current is generally flowing. Can be used for measurement. Further, the first side of the closed circuit 12 is connected to the conductor 10
It suffices that the both ends of the first side are connected to both ends of the portion where the resistance of the conductor 10 is to be measured by approaching them so as to be parallel to, and the connecting operation to the conductor 10 is easy and the workability is excellent. It can be easily measured even with a remote control rod, etc., and its effect is remarkable in practical use. Further, it is possible to measure the effective value I of the alternating current i flowing through the conductor 10 simultaneously with the measurement of the electric resistance.
【００２７】さらに、上記電気抵抗測定方法の実施に用
いる電気抵抗測定装置につき、図３を参照して説明す
る。図３は、本発明の電気抵抗測定装置の一実施例のブ
ロック回路図である。Further, an electric resistance measuring device used for carrying out the electric resistance measuring method will be described with reference to FIG. FIG. 3 is a block circuit diagram of an embodiment of the electric resistance measuring apparatus of the present invention.
【００２８】図３において、矩形の閉回路１２が、導体
１０と同一平面上で、導体１０に近い側の第１の辺を平
行にして検出部２０に配設される。そして、この検出部
２０から導体１０の抵抗が測定される箇所の両端に接続
し得る接触子２２，２２が突設され、これらの接触子２
２，２２が閉回路１２の第１の辺の両端に接続線１４，
１４でそれぞれ接続される。接触子２２，２２の導体１
０への接続により、導体１０と閉回路１２の第１の辺と
接続線１４，１４により閉回路１２と同一平面上に矩形
の別の閉回路が形成される。そして、閉回路１２の第１
の辺と導体１０から遠い側の第２の辺および一方の接続
線１４は途中で切断され、ツイストペアまたは同軸ケー
ブル等を介して、それぞれスイッチ部２４に接続され
る。このスイッチ部２４の動作により、閉回路１２の第
１の辺の切断部の間は、開放または第１抵抗Ｒ１が介装
され、第２の辺の切断部の間は、開放または第１抵抗Ｒ
１と同じ抵抗値の第２抵抗Ｒ２が介装され、接続線１４
の切断部の間は、開放または短絡される。スイッチ部２
４は、スイッチ制御部２６により切り換え制御され、ス
イッチ部２４の動作状態に応じて電圧測定部２８で第１
または第２抵抗Ｒ１，Ｒ２の電圧降下が測定される。電
圧測定部２８から測定電圧に応じた電気信号が信号変換
部３０に与えられて光信号に変換され、光ファイバーケ
ーブル４０に出力される。また、光ファイバーケーブル
４０から信号変換部３０に与えられるスイッチ制御信号
としての光信号が、電気信号に変換されてスイッチ制御
部２６に与えられる。閉回路１２と接続線１４，１４と
接触子２２，２２とスイッチ部２４と第１と第２抵抗Ｒ
１，Ｒ２とスイッチ制御部２６と電圧測定部２８および
信号変換部３０を含んで、検出部２０が構成される。In FIG. 3, a rectangular closed circuit 12 is arranged in the detection unit 20 on the same plane as the conductor 10 with the first side closer to the conductor 10 parallel. Then, contacts 22 which can be connected to both ends of the location where the resistance of the conductor 10 is measured are projected from the detection unit 20, and these contacts 2 are provided.
2, 22 are connection lines 14 at both ends of the first side of the closed circuit 12,
14 are connected respectively. Conductor 1 of the contacts 22,22
By connecting to 0, the conductor 10 and the first side of the closed circuit 12 and the connecting lines 14 and 14 form another rectangular closed circuit on the same plane as the closed circuit 12. Then, the first of the closed circuit 12
And the second side on the side farther from the conductor 10 and one of the connecting wires 14 are cut in the middle and connected to the switch section 24 via a twisted pair or a coaxial cable or the like. By the operation of the switch unit 24, the opening or the first resistor R 1 is interposed between the cut portions of the first side of the closed circuit 12, and the open or the first resistance R 1 is opened between the cut portions of the second side. Resistance R
The second resistor R 2 having the same resistance value as that of 1 is interposed, and the connection line 14
Between the cut portions, the open or short circuit is made. Switch part 2
4 is switched and controlled by the switch control unit 26, and the first voltage measuring unit 28 is controlled by the voltage measuring unit 28 according to the operating state of the switch unit 24.
Alternatively, the voltage drop across the second resistors R 1 and R 2 is measured. An electric signal corresponding to the measured voltage is applied from the voltage measuring unit 28 to the signal converting unit 30 to be converted into an optical signal and output to the optical fiber cable 40. Further, an optical signal as a switch control signal given from the optical fiber cable 40 to the signal conversion unit 30 is converted into an electric signal and given to the switch control unit 26. Closed circuit 12, connecting wires 14 and 14, contacts 22 and 22, switch section 24, first and second resistors R
1 , R 2 , the switch control unit 26, the voltage measurement unit 28, and the signal conversion unit 30 constitute the detection unit 20.
【００２９】また、検出部２０から分けて離して設けら
れる中央処理部５０には、光ファイバーケーブル４０に
接続される信号変換部５２が設けられ、検出部２０から
の測定電圧に応じた光信号が電気信号に再変換されて演
算処理部５４に与えられる。また、制御部５６からスイ
ッチ制御信号としての電気信号が信号変換部５２に与え
られて、光信号に変換されて光ファイバーケーブル４０
に与えられて検出部２０に出力される。マイクロコンピ
ュータ等を用いた演算処理部５４には、上述の電気抵抗
測定方法を実施するのに必要な演算式およびデータが予
め設定されており、測定電圧が与えられると適宜に導体
１０の抵抗Ｒ０を演算し、これが適宜に表示部５８で表
示されるとともに記憶部６０に記憶される。信号変換部
５２と演算処理部５４と制御部５６と表示部５８および
記憶部６０を含んで、中央処理部５０が構成される。The central processing unit 50, which is provided separately from the detection unit 20, is provided with a signal conversion unit 52 connected to the optical fiber cable 40, and an optical signal corresponding to the measured voltage from the detection unit 20 is provided. It is converted back into an electric signal and given to the arithmetic processing unit 54. Further, an electric signal as a switch control signal is given from the control unit 56 to the signal conversion unit 52, converted into an optical signal, and then the optical fiber cable 40.
Is output to the detection unit 20. The arithmetic processing unit 54 using a microcomputer or the like is preset with arithmetic expressions and data required to carry out the above-described electric resistance measuring method, and the resistance R of the conductor 10 is appropriately set when a measurement voltage is applied. 0 is calculated, and this is appropriately displayed on the display unit 58 and stored in the storage unit 60. The central processing unit 50 includes the signal conversion unit 52, the arithmetic processing unit 54, the control unit 56, the display unit 58, and the storage unit 60.
【００３０】検出部２０と中央処理部５０に、それぞれ
駆動用の電源（図示せず）が内蔵されている。また、検
出部２０にあっては磁束と鎖交するようにコイルを設
け、このコイルに生ずる誘導起電力を駆動電源として利
用しても良い。A power supply (not shown) for driving is built in each of the detection unit 20 and the central processing unit 50. Further, in the detection unit 20, a coil may be provided so as to interlink with the magnetic flux, and the induced electromotive force generated in this coil may be used as a drive power source.
【００３１】かかる構成にあっては、導体１０に生じる
磁界に晒される検出部２０と、測定電圧を演算処理する
中央処理部５０を分けて離して設けることで、中央処理
部５０に対する磁界の影響が少なく、演算処理において
誤動作する虞がなく、測定精度の向上に寄与し得る。そ
して、検出部２０と中央処理部５０との間を、光ファイ
バーケーブル４０を介装して光信号で伝達するので、こ
の信号の伝達経路で電気的雑音が重畳されることがな
く、測定精度を向上させ得る。しかも、検出部２０と中
央処理部５０を分けることで、遠隔操作棒等を用いる場
合に、遠隔操作棒の先端に装置全体より軽量な検出部２
０を設ければ良く、それだけ操作性に優れたものとな
る。また、検出部２０と中央処理部５０を充分に離すと
ともに電気的に絶縁でき、安全に抵抗測定をなし得る。In such a structure, the influence of the magnetic field on the central processing unit 50 is provided by separately providing the detection unit 20 exposed to the magnetic field generated in the conductor 10 and the central processing unit 50 for calculating the measured voltage. Is small, there is no possibility of malfunction in arithmetic processing, and it can contribute to improvement of measurement accuracy. Then, since the optical signal is transmitted between the detection unit 20 and the central processing unit 50 via the optical fiber cable 40, electrical noise is not superimposed on the transmission path of this signal, and measurement accuracy is improved. Can improve. Moreover, by separating the detection unit 20 and the central processing unit 50, when a remote control rod or the like is used, the detection unit 2 that is lighter than the entire device at the tip of the remote control rod is used.
It is sufficient to provide 0, and the operability is excellent. Further, the detection unit 20 and the central processing unit 50 can be sufficiently separated from each other and can be electrically insulated, so that the resistance can be measured safely.
【００３２】なお、上記電気抵抗測定方法において、第
３と第２測定電圧ｖ２′，ｖ１′の差（ｖ２′−
ｖ１′）を用いる演算方法にあっては、導体１０と閉回
路１２の第１の辺および接続線１４，１４で形成する閉
回路は、矩形でなくても良い。また、実施例では、閉回
路１２と導体１０を接続する接続線１４，１４の一方に
第３開閉スイッチｓｗ３を直列に介装したが、双方に連
動する開閉スイッチをそれぞれ直列に介装しても良いこ
とは勿論である。In the above electric resistance measuring method, the difference (v 2 ′ −) between the third and second measuring voltages v 2 ′ and v 1 ′.
In the calculation method using v 1 ′), the closed circuit formed by the conductor 10 and the first side of the closed circuit 12 and the connection lines 14 and 14 need not be rectangular. In the embodiment, the third on-off switch sw 3 was interposed in series, interposed closing a switch linking both in series to one connection line 14, 14 for connecting the closed circuit 12 and the conductor 10 Of course, it is okay.
【００３３】[0033]
【発明の効果】以上説明したところから明らかなよう
に、請求項１および２記載の本発明の電気抵抗測定方法
にあっては、いずれも抵抗測定の対象となる導体を活線
状態のままで測定を行なうことができる。しかも、導線
に流れる交流電流による誘導起電力等のために測定に誤
りを生ずることがない。また、導体に対して一側方から
接続させれば良く、操作が簡単であって、遠隔操作棒等
による作業に好適である。As is apparent from the above description, in the electric resistance measuring method of the present invention as set forth in claims 1 and 2, the conductor to be measured for resistance is kept in a live state. The measurement can be performed. Moreover, there is no error in the measurement due to the induced electromotive force or the like due to the alternating current flowing through the conductor. Further, the conductor may be connected from one side, the operation is simple, and it is suitable for work by a remote control rod or the like.
【００３４】また、請求項３記載の本発明の電気抵抗測
定装置にあっては、検出部と中央処理部を分けること
で、中央処理部を導体に生ずる磁界の影響のない位置に
配設することができ、それだけ演算処理に雑音が混入し
て誤った演算がなされる虞がなく、測定結果の信頼性が
高いものとなる。また、装置全体に比べて検出部が軽量
となり、遠隔操作棒等による操作が容易となる。Further, in the electric resistance measuring apparatus of the present invention as defined in claim 3, the detecting section and the central processing section are separated so that the central processing section is arranged at a position where the magnetic field generated in the conductor is not affected. Therefore, there is no possibility that noise will be mixed in the calculation process and an incorrect calculation will be performed, and the reliability of the measurement result will be high. Further, the detection unit is lighter in weight than the entire apparatus, and the operation with a remote control rod or the like becomes easy.
【００３５】そしてまた、請求項４記載の電気抵抗測定
装置にあっては、検出部と中央処理部との間を光信号で
伝達するので、伝達経路で信号に電気的雑音が重畳され
ることがなく、測定結果の精度が高いものとなる。しか
も、中央処理部を検出部から充分に離すとともに電気的
に絶縁でき、安全に抵抗測定を行なうことができる。Further, in the electrical resistance measuring apparatus according to the present invention, since the optical signal is transmitted between the detecting section and the central processing section, electrical noise is superimposed on the signal in the transmission path. Therefore, the accuracy of the measurement result is high. Moreover, the central processing unit can be sufficiently separated from the detection unit and can be electrically insulated, so that the resistance can be measured safely.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の電気抵抗測定方法の原理を説明する図
である。FIG. 1 is a diagram illustrating the principle of an electric resistance measuring method of the present invention.
【図２】測定方法の手順を示すフローチャートである。FIG. 2 is a flowchart showing a procedure of a measuring method.
【図３】本発明の電気抵抗測定装置の一実施例のブロッ
ク回路図である。FIG. 3 is a block circuit diagram of an embodiment of an electric resistance measuring apparatus of the present invention.
【符号の説明】 １０ 導体 １２ 閉回路 １４ 接続線 ２０ 検出部 ２２ 接触子 ２４ スイッチ部 ２６ スイッチ制御部 ２８ 電圧測定部 ３０，５２ 信号変換部 ４０ 光ファイバーケーブル ５０ 中央処理部 ５４ 演算処理部 ５６ 制御部 ５８ 表示部[Explanation of symbols] 10 conductor 12 closed circuit 14 connection wire 20 detection unit 22 contactor 24 switch unit 26 switch control unit 28 voltage measurement unit 30, 52 signal conversion unit 40 optical fiber cable 50 central processing unit 54 arithmetic processing unit 56 control unit 58 display
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図１[Name of item to be corrected] Figure 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
【手続補正３】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図３[Name of item to be corrected] Figure 3
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図３】 [Figure 3]
Claims (4)
導体と同一平面上で一辺を前記導体と平行にして接近さ
せ、前記閉回路の前記導体と平行で近い側の第１の辺に
第１抵抗と第１開閉スイッチを直列に介装し、前記閉回
路の前記導体と平行で遠い側の第２の辺に前記第１抵抗
と同じ値の第２抵抗と第２開閉スイッチを直列に介装
し、前記第１の辺の両端を前記導体の抵抗を測定すべき
箇所の両端にそれぞれ接続線で接続し、これらの接続線
のすくなくとも一方に第３開閉スイッチを直列に介装
し、 前記第１と第２開閉スイッチを閉じて、前記第３開閉ス
イッチを開いて前記第１または第２抵抗の降下電圧を測
定して第１測定電圧となし、前記第１と第３開閉スイッ
チを閉じて、前記第２開閉スイッチを開いて前記第１抵
抗の降下電圧を測定して第２測定電圧となし、前記第２
と第３開閉スイッチを閉じて、前記第１開閉スイッチを
開いて前記第２抵抗の降下電圧を測定して第３測定電圧
となし、 前記第２と第３測定電圧の差電圧と、前記第１測定電圧
とから、前記導体の抵抗を演算することを特徴とした電
気抵抗測定方法。1. A rectangular closed circuit is brought close to the conductor whose resistance is to be measured on the same plane with one side being parallel to the conductor, and the first side being parallel and close to the conductor of the closed circuit. And a first resistor and a first open / close switch are connected in series, and a second resistor and a second open / close switch having the same value as the first resistor are provided on a second side of the closed circuit that is parallel and far from the conductor. The first side is connected in series, and both ends of the first side are connected to both ends of the portion where the resistance of the conductor is to be measured by connecting lines, and the third open / close switch is connected in series to at least one of these connecting lines. Then, the first and second opening / closing switches are closed, the third opening / closing switch is opened, and the voltage drop of the first or second resistor is measured to obtain a first measured voltage, and the first and third opening / closing switches are provided. Close the switch and open the second open / close switch to measure the voltage drop of the first resistor. And a second measurement voltage and without, the second
And a third open / close switch is closed, the first open / close switch is opened, and the voltage drop of the second resistor is measured to form a third measured voltage. The difference voltage between the second and third measured voltages; 1. An electric resistance measuring method, characterized in that the resistance of the conductor is calculated from 1 measurement voltage.
て、前記第１の辺と前記導体の抵抗を測定すべき箇所と
これらを接続する前記接続線で矩形閉回路を形成し、前
記第２と第３測定電圧の差電圧に代えて、前記第２と第
３測定電圧の比から前記導体と前記第１の辺の間の距離
を演算し、この距離と前記第１測定電圧から前記導体の
抵抗を演算することを特徴とした電気抵抗測定方法。2. The electric resistance measuring method according to claim 1, wherein a rectangular closed circuit is formed by the first side, a portion where resistance of the conductor is to be measured, and the connecting line connecting the two, and the second side. Instead of the difference voltage between the third and third measurement voltages, the distance between the conductor and the first side is calculated from the ratio of the second and third measurement voltages, and the conductor is calculated from this distance and the first measurement voltage. A method for measuring electric resistance, which comprises calculating the resistance of
上で一辺を前記導体と平行にして接近させる矩形の閉回
路と、前記閉回路の前記導体と平行で近い側の第１の辺
に直列に介装された第１抵抗と第１開閉スイッチと、前
記閉回路の前記導体と平行で遠い側の第２の辺に直列に
介装された前記第１抵抗と同じ値の第２抵抗と第２開閉
スイッチと、先端に接触子を有し前記第１の辺の両端を
前記導体の抵抗を測定すべき箇所の両端にそれぞれ接続
する接続線と、前記第１と第２と第３開閉スイッチを開
閉制御するスイッチ制御部と、前記第１と第２と第３開
閉スイッチの所定の制御状態で前記第１または第２抵抗
の降下電圧を測定する電圧測定部と、この電圧測定部に
よる測定電圧から前記導体の抵抗を演算する演算処理部
と、を備えて構成することを特徴とした電気抵抗測定装
置。3. A rectangular closed circuit that approaches a conductor whose resistance is to be measured with one side parallel to the conductor on the same plane, and a first side of the closed circuit that is parallel and close to the conductor. A first resistor and a first open / close switch interposed in series, and a second resistor having the same value as the first resistor interposed in series on a second side of the closed circuit that is parallel to the conductor and is on the far side. A resistance and a second opening / closing switch; a connecting wire having a contact at its tip and connecting both ends of the first side to both ends of a portion where the resistance of the conductor is to be measured; A switch control unit for controlling the opening and closing of the three open / close switches, a voltage measuring unit for measuring the voltage drop of the first or second resistor in a predetermined control state of the first, second and third open / close switches, and this voltage measurement And a calculation processing unit that calculates the resistance of the conductor from the voltage measured by the unit. An electric resistance measuring device characterized in that
て、装置を検出部とこれと離れた中央処理部とに分け、
前記演算処理部を前記中央処理部に設け、前記検出部と
中央処理部にそれぞれ信号変換部を設け、双方の信号変
換部の間を光ファイバーケーブルで接続して光により信
号を伝達するように構成したことを特徴とした電気抵抗
測定装置。4. The electric resistance measuring device according to claim 3, wherein the device is divided into a detecting part and a central processing part separated from the detecting part.
The arithmetic processing unit is provided in the central processing unit, the detection unit and the central processing unit are respectively provided with signal conversion units, and both signal conversion units are connected by an optical fiber cable to transmit a signal by light. An electrical resistance measuring device characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33949393A JP3288836B2 (en) | 1993-12-03 | 1993-12-03 | Electric resistance measuring method and electric resistance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33949393A JP3288836B2 (en) | 1993-12-03 | 1993-12-03 | Electric resistance measuring method and electric resistance measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07159461A true JPH07159461A (en) | 1995-06-23 |
| JP3288836B2 JP3288836B2 (en) | 2002-06-04 |
Family
ID=18327992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33949393A Expired - Fee Related JP3288836B2 (en) | 1993-12-03 | 1993-12-03 | Electric resistance measuring method and electric resistance measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3288836B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4810648B2 (en) * | 2006-05-08 | 2011-11-09 | テクトロニクス・インコーポレイテッド | Input bypass circuit for current probe |
| WO2014046028A1 (en) * | 2012-09-18 | 2014-03-27 | 日産自動車株式会社 | Stacked-battery internal resistance measurement circuit |
-
1993
- 1993-12-03 JP JP33949393A patent/JP3288836B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4810648B2 (en) * | 2006-05-08 | 2011-11-09 | テクトロニクス・インコーポレイテッド | Input bypass circuit for current probe |
| WO2014046028A1 (en) * | 2012-09-18 | 2014-03-27 | 日産自動車株式会社 | Stacked-battery internal resistance measurement circuit |
| JPWO2014046028A1 (en) * | 2012-09-18 | 2016-08-18 | 日産自動車株式会社 | Multilayer battery internal resistance measurement circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3288836B2 (en) | 2002-06-04 |
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