JP2002131349A - Method and device for measuring grounding resistance - Google Patents
Method and device for measuring grounding resistanceInfo
- Publication number
- JP2002131349A JP2002131349A JP2000325805A JP2000325805A JP2002131349A JP 2002131349 A JP2002131349 A JP 2002131349A JP 2000325805 A JP2000325805 A JP 2000325805A JP 2000325805 A JP2000325805 A JP 2000325805A JP 2002131349 A JP2002131349 A JP 2002131349A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- individual
- grounding
- resistance
- lead wire
- 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.)
- Granted
Links
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は個別接地極の接地抵
抗を、接地としての機能を損なうことなく接地抵抗を測
定する接地抵抗測定方法及び接地抵抗測定装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground resistance measuring method and a ground resistance measuring device for measuring the ground resistance of an individual ground electrode without impairing the function as a ground.
【0002】[0002]
【従来の技術】補助電極を用いることなく接地極の接地
抵抗を測定する従来の接地抵抗測定装置の構成を図5に
示す。同図において、1は大地に埋設された接地極、2
は接地極が測定器4に接続されたリード線、3は一端が
開放され大地との間で容量接続されるように配設され、
他端が測定器4に接続されたリターン導線、4は接地極
1の接地抵抗を測定する測定器である。接地抵抗測定装
置は、リード線2、リターン導線3及び測定器4から構
成されている。2. Description of the Related Art FIG. 5 shows a configuration of a conventional ground resistance measuring apparatus for measuring the ground resistance of a ground electrode without using an auxiliary electrode. In the figure, 1 is a ground electrode buried in the ground, 2
Is a lead wire whose grounding pole is connected to the measuring instrument 4, and 3 is arranged so that one end is open and is capacitively connected to the ground,
The return conductor 4 whose other end is connected to the measuring device 4 is a measuring device for measuring the ground resistance of the ground electrode 1. The ground resistance measuring device includes a lead wire 2, a return conductor 3, and a measuring device 4.
【0003】上記構成からなる従来の接地抵抗測定装置
では、測定器4から数100kHz〜2MHz程度の周
波数の正弦波信号を発生させ、リード線2とリターン導
線3を介して接地極1に信号を印加し、その際、測定系
で構成される接地抵抗と、リード線2、リターン導線3
等のインダクタンス、リターン導線3と大地間で形成さ
れる静電容量からなる直列共振回路の共振点における周
波数のインピーダンスから接地抵抗を求めるものであっ
た。In the conventional grounding resistance measuring device having the above-described configuration, a sine wave signal having a frequency of about several hundred kHz to 2 MHz is generated from the measuring device 4 and the signal is transmitted to the grounding pole 1 via the lead wire 2 and the return conductor 3. At this time, the ground resistance constituted by the measuring system, the lead wire 2 and the return conductor 3
The ground resistance is determined from the impedance of the series and the impedance at the resonance point of the series resonance circuit including the capacitance formed between the return conductor 3 and the ground.
【0004】[0004]
【発明が解決しようとする課題】従来の接地抵抗測定装
置では、補助電極を用いずに独立した接地極の接地抵抗
を測定することが可能である。しかしながら、その他の
接地体に接続されている既設設備における個別の接地極
の接地抵抗を測定する場合、印加信号が個別の接地極以
外の接地体に流出するため、個別の接地抵抗を測定する
ことが困難であった。In the conventional earth resistance measuring device, it is possible to measure the earth resistance of an independent earth electrode without using an auxiliary electrode. However, when measuring the grounding resistance of individual grounding poles of existing equipment connected to other grounding bodies, the individual grounding resistance must be measured because the applied signal flows to grounding bodies other than the individual grounding poles. Was difficult.
【0005】このため、個別の接地極の接地抵抗を測定
するためには、個別の接地極と既存設備もしくは既存設
備と接続される接地体相互を切り離す必要があった。本
発明はこのような事情に鑑みてなされたものであり、既
存設備から接地線を切離さずに、かつ、補助電極を用い
ず、簡易に個別接地極の接地抵抗を測定することができ
る接地抵抗測定方法及び接地抵抗測定装置を提供するこ
とを目的とする。[0005] Therefore, in order to measure the ground resistance of each ground electrode, it is necessary to separate each ground electrode from the existing equipment or the grounding body connected to the existing equipment. The present invention has been made in view of such circumstances, and a grounding device that can easily measure the grounding resistance of an individual grounding electrode without disconnecting a grounding line from existing equipment and without using an auxiliary electrode. It is an object to provide a resistance measuring method and a ground resistance measuring device.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
に、請求項1に記載の発明は、既存設備と、大地に埋設
された個別接地極とを接続する接地線に接続されたリー
ド線の一端と、大地との間に容量結合されるように一端
が開放された状態で配設されるリターン導線の他端との
間に交流信号を印加した際に、該交流信号印加前後の時
点において測定された電圧比から前記個別接地極の接地
抵抗を求める接地抵抗測定方法において、前記接地線に
おける前記リード線の他端との接続点と、前記既存設備
との間のインピーダンスを、前記個別接地極の接地抵抗
の測定に使用する交流信号の周波数近傍では高インピー
ダンスにし、商用周波数近傍では低インピーダンスにし
て接地抵抗の測定を行うことを特徴とする。In order to achieve the above object, according to the present invention, there is provided a lead wire connected to a ground wire for connecting existing equipment and an individual ground electrode buried in the ground. When an AC signal is applied between one end of the return conductor and the other end of the return lead wire disposed with one end open so as to be capacitively coupled to the ground, the time before and after the AC signal is applied In the grounding resistance measuring method for obtaining the grounding resistance of the individual grounding pole from the voltage ratio measured in the above, the impedance between the connection point of the grounding wire with the other end of the lead wire and the existing equipment, the impedance of the individual equipment It is characterized in that the impedance is set to be high near the frequency of the AC signal used for measuring the ground resistance of the ground pole, and to be low near the commercial frequency to measure the ground resistance.
【0007】また、請求項2に記載の発明は、既存設備
と、大地に埋設された個別接地極とを接続する接地線に
一端が接続されたリード線と、一端が開放され大地との
間に容量結合されるように配設されるリターン導線と、
前記リード線の他端と前記リターン導線の他端との間に
交流信号を印加した際に、該交流信号印加前後の時点に
おいて測定された電圧比から前記個別接地極の接地抵抗
を測定する計測手段とを有する接地抵抗測定装置におい
て、前記接地線における前記リード線の一端との接続点
と前記既存設備との間に前記個別接地極の接地抵抗の測
定に使用する交流信号の周波数近傍では高インピーダン
スとなり、商用周波数近傍では低インピーダンスとなる
回路を挿入したことを特徴とする。According to a second aspect of the present invention, a lead wire having one end connected to a ground wire connecting an existing facility and an individual ground electrode buried in the ground, and a ground wire having one end opened. A return conductor arranged to be capacitively coupled to the
When an AC signal is applied between the other end of the lead wire and the other end of the return conductor, a measurement is performed to measure the ground resistance of the individual ground electrode from a voltage ratio measured before and after the application of the AC signal. Means for measuring the grounding resistance of the individual grounding pole between the connection point of the grounding line and one end of the lead wire and the existing equipment, near the frequency of the AC signal used for measuring the grounding resistance of the individual grounding pole. It is characterized in that a circuit that becomes impedance and has low impedance near the commercial frequency is inserted.
【0008】また、請求項3に記載の発明は、請求項2
に記載の接地抵抗測定装置において、前記回路は、前記
接地線における前記リード線の一端との接続点と前記既
存設備との間に装着される強磁性体で形成された筒体で
あることを特徴とする。[0008] Further, the invention described in claim 3 is based on claim 2.
In the grounding resistance measuring device according to the above, the circuit is a cylindrical body formed of a ferromagnetic material attached between the connection point of the grounding wire and one end of the lead wire and the existing equipment. Features.
【0009】また、請求項4に記載の発明は、請求項2
に記載の接地抵抗測定装置において、前記回路は、イン
ダクタンスであることを特徴とする。The invention described in claim 4 is the same as the invention described in claim 2.
3. The grounding resistance measuring device according to item 1, wherein the circuit is an inductance.
【0010】また、請求項5に記載の発明は、請求項2
に記載の接地抵抗測定装置において、前記回路は、イン
ダクタンスと静電容量とが並列接続された並列回路であ
ることを特徴とする。The invention described in claim 5 is the same as the claim 2.
Wherein the circuit is a parallel circuit in which an inductance and a capacitance are connected in parallel.
【0011】本発明に係る接地抵抗測定方法によれば、
既存設備と、大地に埋設された個別接地極とを接続する
接地線に接続されたリード線の一端と、大地との間に容
量結合されるように一端が開放された状態で配設される
リターン導線の他端との間に交流信号を印加した際に、
該交流信号印加前後の時点において測定された電圧比か
ら前記個別接地極の接地抵抗を求める接地抵抗測定方法
において、前記接地線における前記リード線の他端との
接続点と、前記既存設備との間のインピーダンスを、前
記個別接地極の接地抵抗の測定に使用する交流信号の周
波数近傍では高インピーダンスとし、商用周波数近傍で
は低インピーダンスにとして接地抵抗の測定を行うの
で、接地抵抗測定時には既存設備側と個別接地極とが高
インピーダンスで電気的に分離される。このとき商用周
波数では低インピーダンスとなるので、保安用接地とし
ての機能には影響がない。したがって、既存設備から接
地線を切り離さずに、かつ、補助電極を用いることな
く、個別接地極の接地抵抗を測定することができる。According to the ground resistance measuring method of the present invention,
One end of a lead wire connected to a ground wire connecting an existing facility and an individual ground electrode buried in the ground is arranged with one end open so as to be capacitively coupled to the ground. When an AC signal is applied between the other end of the return conductor,
In the grounding resistance measuring method for obtaining the grounding resistance of the individual grounding pole from the voltage ratio measured before and after the application of the AC signal, a connection point between the ground wire and the other end of the lead wire, The impedance between the individual ground poles is set to a high impedance near the frequency of the AC signal used to measure the ground resistance of the individual ground pole, and the impedance is set to a low impedance near the commercial frequency. And the individual ground electrodes are electrically separated with high impedance. At this time, since the impedance is low at the commercial frequency, the function as the security ground is not affected. Therefore, the ground resistance of the individual ground electrode can be measured without disconnecting the ground line from the existing equipment and without using the auxiliary electrode.
【0012】本発明に係る接地抵抗測定装置によれば、
測定信号(交流信号)をリード線を介した接地極と、リ
ターン導線に印加し、測定信号印加前後の時点における
測定器の信号印加端子間の電圧比から個別接地極の接地
抵抗を求めることができる。このとき、接地線における
前記リード線との接続点と既存設備との間に前記個別接
地極の接地抵抗の測定に使用する交流信号の周波数近傍
では高インピーダンスとなり、商用周波数近傍では低イ
ンピーダンスとなる回路を挿入することにより、接地線
を介して既存設備側に信号が流れないため、印加した信
号が接地極に流れる。According to the grounding resistance measuring device according to the present invention,
A measurement signal (AC signal) is applied to the ground electrode via the lead wire and the return conductor, and the ground resistance of the individual ground electrode can be determined from the voltage ratio between the signal application terminals of the measuring instrument before and after the application of the measurement signal. it can. At this time, the impedance becomes high near the frequency of the AC signal used for measuring the ground resistance of the individual ground electrode between the connection point of the ground wire and the lead wire and the existing equipment, and becomes low impedance near the commercial frequency. By inserting the circuit, the signal does not flow to the existing equipment via the ground line, and thus the applied signal flows to the ground electrode.
【0013】ただし、商用電源周波数に対して当該回路
は低インピーダンスであるため、接地としての機能への
影響はない。したがって、既存設備から接地線を切離さ
ずに、かつ、補助電極を用いることなく個別接地極の接
地抵抗を測定することができる。However, since the circuit has a low impedance with respect to the frequency of the commercial power supply, there is no influence on the function as a ground. Therefore, the ground resistance of the individual ground electrode can be measured without disconnecting the ground line from the existing equipment and without using the auxiliary electrode.
【0014】[0014]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して詳細に説明する。尚、本発明の第1実施形態
乃至第4実施形態に係る接地抵抗測定装置は、既存設備
と、大地に埋設された個別接地極とを接続する接地線に
接続されたリード線の一端と、大地との間に容量結合さ
れるように一端が開放された状態で配設されるリターン
導線の他端との間に交流信号を印加した際に、該交流信
号印加前後の時点において測定された電圧比から前記個
別接地極の接地抵抗を求める接地抵抗測定方法におい
て、前記接地線における前記リード線の他端との接続点
と、前記既存設備との間のインピーダンスを、前記個別
接地極の接地抵抗の測定に使用する交流信号の周波数近
傍では高インピーダンスとし、商用周波数近傍では低イ
ンピーダンスにとして接地抵抗の測定を行うことを特徴
とする接地抵抗測定方法を実施するための装置である。Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, the ground resistance measuring apparatus according to the first to fourth embodiments of the present invention includes an existing facility and one end of a lead wire connected to a ground wire connecting an individual ground electrode buried in the ground, When an AC signal was applied between the other end of the return conductor disposed with one end open so as to be capacitively coupled to the ground, the measurement was performed before and after the AC signal was applied. In the grounding resistance measuring method for obtaining the grounding resistance of the individual grounding pole from a voltage ratio, an impedance between a connection point of the grounding line with the other end of the lead wire and the existing equipment is set to the grounding of the individual grounding pole. A device for implementing a ground resistance measuring method, characterized in that the impedance is measured at a high impedance near the frequency of the AC signal used for measuring the resistance and at a low impedance near the commercial frequency, and the ground resistance is measured. That.
【0015】<第1実施形態>本発明の第1実施形態に係
る接地抵抗測定装置の構成を図1に示す。同図におい
て、本実施の形態に係る接地抵抗測定装置は、既存設備
6と、大地に埋設された個別接地極1とを接続する接地
線5に一端が接続されたリード線2と、一端が開放され
大地との間に容量結合されるように配設されるリターン
導線3と、リード線2の他端とリターン導線3の他端と
の間に交流信号を印加した際に、該交流信号印加前後の
時点において測定された電圧比から個別接地極1の接地
抵抗を測定する計測手段としての測定器4とを有してい
る。<First Embodiment> FIG. 1 shows a configuration of a ground resistance measuring apparatus according to a first embodiment of the present invention. In the figure, a ground resistance measuring device according to the present embodiment includes a lead wire 2 having one end connected to a ground wire 5 connecting an existing facility 6 and an individual ground electrode 1 buried in the ground, When an AC signal is applied between an open end of the return lead wire 3 disposed so as to be capacitively coupled to the ground and the other end of the lead wire 2 and the other end of the return lead wire 3, the AC signal And a measuring device 4 for measuring the ground resistance of the individual ground electrode 1 from the voltage ratio measured before and after the application.
【0016】さらに、本実施の形態に係る接地抵抗測定
装置は、接地線5におけるリード線2の一端との接続点
と既存設備6との間に個別接地極1の接地抵抗の測定に
使用する上記交流信号の周波数近傍では高インピーダン
スとなり、商用周波数近傍では低インピーダンスとなる
回路8が挿入されている。7は既存設備に接続されてい
るその他の接地体である。Further, the earth resistance measuring apparatus according to the present embodiment is used for measuring the earth resistance of the individual earth pole 1 between the connection point between the ground wire 5 and one end of the lead wire 2 and the existing equipment 6. A circuit 8 having a high impedance near the frequency of the AC signal and a low impedance near the commercial frequency is inserted. 7 is another grounding body connected to the existing equipment.
【0017】上記構成において、回路8は、個別接地極
1の接地抵抗を測定する交流信号の周波数帯域、すなわ
ち、測定周波数帯域において、高インピーダンスとなる
ため、個別接地極1と既存設備が高インピーダンスで分
離される(ただし、商用周波数においては低インピーダ
ンスとなるため、保安用接地としての機能には影響を与
えない)。このため、個別接地極1の接地抵抗測定にお
いて個別接地極1の接地抵抗値のみを評価することがで
きる。このように本実施の形態によれば、既存設備から
接地線を切離さずに、かつ、補助電極を用いることなく
個別接地極の接地抵抗を測定することができる。In the above configuration, since the circuit 8 has a high impedance in the frequency band of the AC signal for measuring the ground resistance of the individual ground pole 1, that is, in the measurement frequency band, the individual ground pole 1 and the existing equipment have a high impedance. (However, since the impedance is low at the commercial frequency, it does not affect the function as the safety ground). Therefore, only the ground resistance value of the individual ground electrode 1 can be evaluated in the measurement of the ground resistance of the individual ground electrode 1. As described above, according to the present embodiment, the ground resistance of the individual ground electrode can be measured without disconnecting the ground line from the existing equipment and without using the auxiliary electrode.
【0018】<第2実施の形態>本発明の第2実施形態に
係る接地抵抗測定装置の構成を図2に示す。本実施の形
態に係る接地抵抗測定装置が第1実施形態に係る接地抵
抗測定装置と、構成上、異なるのは、図1における回路
8の代わりに、接地線5におけるリード線2の一端との
接続点と前記既存設備との間に強磁性体で形成された筒
体9を装着した点であり、他の構成は第1実施形態と同
様であるので、重複する説明は省略する。<Second Embodiment> FIG. 2 shows a configuration of a ground resistance measuring apparatus according to a second embodiment of the present invention. The ground resistance measuring apparatus according to the present embodiment differs from the ground resistance measuring apparatus according to the first embodiment in configuration in that the ground resistance measuring apparatus is connected to one end of the lead wire 2 in the ground line 5 instead of the circuit 8 in FIG. This is the point that a cylindrical body 9 made of a ferromagnetic material is mounted between the connection point and the existing equipment, and the other configuration is the same as that of the first embodiment, and thus the duplicated description will be omitted.
【0019】上記構成からなる本実施の形態に係る接地
抵抗測定装置では、接地線5に挿入する強磁性体で形成
された筒体9は、回路8と同様の特性を有し、個別接地
極1の接地抵抗の測定周波数において高インピーダンス
となり、商用周波数では低インピーダンスとなる特性を
有している。In the grounding resistance measuring apparatus according to the present embodiment having the above-described configuration, the cylindrical body 9 formed of a ferromagnetic material inserted into the grounding line 5 has the same characteristics as the circuit 8 and has the individual grounding pole. 1 has a characteristic that the impedance becomes high at the measurement frequency of the ground resistance and becomes low at the commercial frequency.
【0020】したがって、測定周波数帯域において、強
磁性体で形成された筒体9は高インピーダンスとなるた
め、個別接地極1と既存設備6とが電気的に分離される
(ただし、商用周波数において、強磁性体で形成された
筒体9は低インピーダンスとなるため、保安用接地とし
ての機能には影響を与えない)。このため、接地抵抗測
定において接地極の接地抵抗値のみを評価することがで
きる。このように本実施の形態によれば、第1実の形態
と同様に、既存設備から接地線を切離さずに、かつ、補
助電極を用いることなく個別接地極の接地抵抗を測定す
ることができる。Therefore, in the measurement frequency band, the cylindrical body 9 made of a ferromagnetic material has a high impedance, so that the individual grounding pole 1 and the existing equipment 6 are electrically separated (however, at the commercial frequency, Since the cylindrical body 9 formed of a ferromagnetic material has low impedance, it does not affect the function as a security ground.) Therefore, only the ground resistance value of the ground electrode can be evaluated in the ground resistance measurement. As described above, according to the present embodiment, similarly to the first embodiment, it is possible to measure the ground resistance of the individual ground electrode without disconnecting the ground line from the existing equipment and without using the auxiliary electrode. it can.
【0021】<第3実施形態>本発明の第3実施形態に係
る接地抵抗測定装置の構成を図3に示す。本実施の形態
に係る接地抵抗測定装置が第1実施形態に係る接地抵抗
測定装置と、構成上、異なるのは、図1における回路8
の代わりに、接地線5に測定周波数において高インピー
ダンス特性を示す回路8と同様の特性を有するインダク
タンス10を挿入するようにした点であり、他の構成は
第1実施形態と同様であるので、重複する説明は省略す
る。このとき、インダクタンス10を挿入した区間にお
ける接地線5は一旦、切り離すが、保安用接地としての
機能に問題は生じない。<Third Embodiment> FIG. 3 shows a configuration of a ground resistance measuring apparatus according to a third embodiment of the present invention. The ground resistance measuring apparatus according to the present embodiment differs from the ground resistance measuring apparatus according to the first embodiment in configuration in the circuit 8 in FIG.
Instead of this, an inductance 10 having the same characteristics as the circuit 8 exhibiting high impedance characteristics at the measurement frequency is inserted into the ground line 5, and the other configuration is the same as that of the first embodiment. Duplicate description will be omitted. At this time, the ground line 5 in the section where the inductance 10 is inserted is once disconnected, but there is no problem in the function as the security ground.
【0022】上記構成からなる本実施の形態に係る接地
抵抗測定装置では、測定周波数帯域において、インダク
タンス10は高インピーダンスとなるため、個別接地極
1と既存設備6とが電気的に分離される(ただし、商用
周波数において、インダクタンス10は低インピーダン
スとなるため、保安用接地としての機能には影響を与え
ない)。このため、接地抵抗測定において個別接地極1
の接地抵抗値のみを評価することができる。このように
本実施の形態によれば、第1実の形態と同様に、既存設
備から接地線を切離さずに、かつ、補助電極を用いるこ
となく個別接地極の接地抵抗を測定することができる。In the ground resistance measuring apparatus according to the present embodiment having the above-described configuration, since the inductance 10 has a high impedance in the measurement frequency band, the individual ground electrode 1 and the existing equipment 6 are electrically separated ( However, since the inductance 10 has a low impedance at a commercial frequency, the inductance 10 does not affect the function as a security ground.) For this reason, the individual ground electrode 1
Can be evaluated only. As described above, according to the present embodiment, similarly to the first embodiment, it is possible to measure the ground resistance of the individual ground electrode without disconnecting the ground line from the existing equipment and without using the auxiliary electrode. it can.
【0023】<第4実施形態>本発明の第4実施形態に係
る接地抵抗測定装置の構成を図4に示す。本実施の形態
に係る接地抵抗測定装置が第1実施形態に係る接地抵抗
測定装置と、構成上、異なるのは、図1における回路8
の代わりに、接地線5に測定周波数において高インピー
ダンス特性を示す回路8と同様の特性を有するインダク
タンスと静電容量が並列接続された並列回路11を挿入
するようにした点であり、他の構成は第1実施形態と同
様であるので、重複する説明は省略する。このとき、並
列回路11を挿入した区間における接地線5は一旦、切
り離すが、保安用接地としての機能に問題は生じない。<Fourth Embodiment> FIG. 4 shows the configuration of a ground resistance measuring apparatus according to a fourth embodiment of the present invention. The ground resistance measuring apparatus according to the present embodiment differs from the ground resistance measuring apparatus according to the first embodiment in configuration in the circuit 8 in FIG.
Instead of this, a parallel circuit 11 in which an inductance and a capacitance having characteristics similar to those of the circuit 8 showing high impedance characteristics at the measurement frequency are connected in parallel to the ground line 5 is inserted. Are the same as in the first embodiment, and a duplicate description will be omitted. At this time, the ground line 5 in the section where the parallel circuit 11 is inserted is once disconnected, but there is no problem in the function as the security ground.
【0024】上記構成からなる本実施の形態に係る接地
抵抗測定装置では、測定周波数帯域において、インダク
タンスと静電容量が並列接続された並列回路11は高イ
ンピーダンスとなるため、個別接地極1と既存設備6と
が電気的に分離される(ただし、商用周波数において、
並列回路11は低インピーダンスとなるため、保安用接
地としての機能には影響を与えない)。このため、接地
抵抗測定において個別接地極1の接地抵抗値のみを評価
することができる。このように本実施の形態によれば、
第1実の形態と同様に、既存設備から接地線を切離さず
に、かつ、補助電極を用いることなく個別接地極の接地
抵抗を測定することができる。In the ground resistance measuring apparatus according to the present embodiment having the above configuration, the parallel circuit 11 in which the inductance and the capacitance are connected in parallel has a high impedance in the measurement frequency band. The equipment 6 is electrically isolated (however, at commercial frequency,
Since the parallel circuit 11 has a low impedance, it does not affect the function as a security ground). Therefore, only the ground resistance value of the individual ground electrode 1 can be evaluated in the ground resistance measurement. Thus, according to the present embodiment,
As in the first embodiment, the ground resistance of the individual ground electrode can be measured without disconnecting the ground line from the existing equipment and without using an auxiliary electrode.
【0025】[0025]
【発明の効果】以上に説明したように、本発明に係る接
地抵抗測定方法によれば、既存設備と、大地に埋設され
た個別接地極とを接続する接地線に接続されたリード線
の一端と、大地との間に容量結合されるように一端が開
放された状態で配設されるリターン導線の他端との間に
交流信号を印加した際に、該交流信号印加前後の時点に
おいて測定された電圧比から前記個別接地極の接地抵抗
を求める接地抵抗測定方法において、前記接地線におけ
る前記リード線の他端との接続点と、前記既存設備との
間のインピーダンスを、前記個別接地極の接地抵抗の測
定に使用する交流信号の周波数近傍では高インピーダン
スとし、商用周波数近傍では低インピーダンスにとして
接地抵抗の測定を行うので、接地抵抗測定時には既存設
備側と個別接地極とが高インピーダンスで電気的に分離
される。このとき商用周波数では低インピーダンスとな
るので、保安用接地としての機能には影響がない。した
がって、既存設備から接地線を切り離さずに、かつ、補
助電極を用いることなく、個別接地極の接地抵抗を測定
することができる。As described above, according to the ground resistance measuring method of the present invention, one end of a lead wire connected to a ground wire connecting existing equipment and an individual ground electrode buried in the ground. When an AC signal is applied between the other end of the return lead wire disposed with one end open so as to be capacitively coupled to the ground, measurement is performed before and after the AC signal is applied. The ground resistance of the individual ground pole from the voltage ratio obtained, the impedance between the connection point of the ground wire and the other end of the lead wire and the existing equipment, the individual ground pole The ground resistance is measured at a high impedance near the frequency of the AC signal used to measure the ground resistance of the AC signal, and at a low impedance near the commercial frequency. There are electrically isolated by high impedance. At this time, since the impedance is low at the commercial frequency, the function as the security ground is not affected. Therefore, the ground resistance of the individual ground electrode can be measured without disconnecting the ground line from the existing equipment and without using the auxiliary electrode.
【0026】また、本発明の接地抵抗測定装置によれ
ば、既存設備と、大地に埋設された個別接地極とを接続
する接地線に一端が接続されたリード線と、一端が開放
され大地との間に容量結合されるように配設されるリタ
ーン導線と、前記リード線の他端と前記リターン導線の
他端との間に交流信号を印加した際に、該交流信号印加
前後の時点において測定された電圧比から前記個別接地
極の接地抵抗を測定する計測手段とを有する接地抵抗測
定装置において、前記接地線における前記リード線の一
端との接続点と前記既存設備との間に前記個別接地極の
接地抵抗の測定に使用する交流信号の周波数近傍では高
インピーダンスとなり、商用周波数近傍では低インピー
ダンスとなる回路を挿入したので、既存設備から接地線
を切り離さずに、かつ、補助電極を用いることなく、個
別接地極の接地抵抗を測定することができる。Further, according to the ground resistance measuring apparatus of the present invention, a lead wire having one end connected to a ground wire connecting an existing facility and an individual ground electrode buried in the ground, When an AC signal is applied between the other end of the lead wire and the other end of the return lead wire, the return lead wire is disposed so as to be capacitively coupled therebetween. A measuring means for measuring a ground resistance of the individual ground electrode from the measured voltage ratio, wherein the individual equipment is provided between a connection point of the ground wire with one end of the lead wire and the existing equipment. Since a circuit with high impedance near the frequency of the AC signal used for measuring the grounding resistance of the grounding pole and low impedance near the commercial frequency was inserted, do not disconnect the grounding line from the existing equipment. , Without using the auxiliary electrode, it is possible to measure the ground resistance of individual earth electrode.
【図1】 本発明の第1実施形態に係る接地抵抗測定装
置の構成を示すブロック図。FIG. 1 is a block diagram showing a configuration of a grounding resistance measuring device according to a first embodiment of the present invention.
【図2】 本発明の第2実施形態に係る接地抵抗測定装
置の構成を示すブロック図。FIG. 2 is a block diagram showing a configuration of a grounding resistance measuring device according to a second embodiment of the present invention.
【図3】 本発明の第3実施形態に係る接地抵抗測定装
置の構成を示すブロック図。FIG. 3 is a block diagram showing a configuration of a grounding resistance measuring device according to a third embodiment of the present invention.
【図4】 本発明の第4実施形態に係る接地抵抗測定装
置の構成を示すブロック図。FIG. 4 is a block diagram showing a configuration of a grounding resistance measuring device according to a fourth embodiment of the present invention.
【図5】 従来の接地抵抗測定装置の構成を示すブロッ
ク図。FIG. 5 is a block diagram showing a configuration of a conventional ground resistance measuring device.
【符号の説明】 1 個別接地極 2 リード線 3 リターン導線 4 測定器 5 接地線 6 既存設備 7 その他の接地体 8 高インピーダンス回路 9 強磁性体で形成された筒体 10 インダクタンス 11 インダクタンスと静電容量の並列回路[Description of Signs] 1 Individual grounding pole 2 Lead wire 3 Return wire 4 Measuring instrument 5 Ground wire 6 Existing equipment 7 Other grounding body 8 High impedance circuit 9 Cylindrical body formed of ferromagnetic material 10 Inductance 11 Inductance and electrostatic Capacity parallel circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 服部 光男 東京都新宿区西新宿三丁目19番2号 東日 本電信電話株式会社内 Fターム(参考) 2G028 AA01 BC06 CG02 DH05 FK09 HN02 MS01 ────────────────────────────────────────────────── ─── Continued on the front page (72) Mitsuo Hattori Inventor F-term (reference) 2G028 AA01 BC06 CG02 DH05 FK09 HN02 MS01 in Nippon Telegraph and Telephone Corporation 3-9-1-2 Nishishinjuku, Shinjuku-ku, Tokyo
Claims (5)
極とを接続する接地線に接続されたリード線の一端と、
大地との間に容量結合されるように一端が開放された状
態で配設されるリターン導線の他端との間に交流信号を
印加した際に、該交流信号印加前後の時点において測定
された電圧比から前記個別接地極の接地抵抗を求める接
地抵抗測定方法において、 前記接地線における前記リード線の他端との接続点と、
前記既存設備との間のインピーダンスを、前記個別接地
極の接地抵抗の測定に使用する交流信号の周波数近傍で
は高インピーダンスにし、商用周波数近傍では低インピ
ーダンスにして接地抵抗の測定を行うことを特徴とする
接地抵抗測定方法。1. One end of a lead wire connected to a ground wire connecting an existing facility and an individual ground electrode buried in the ground,
When an AC signal was applied between the other end of the return conductor disposed with one end open so as to be capacitively coupled to the ground, the measurement was performed before and after the AC signal was applied. In a ground resistance measuring method for obtaining a ground resistance of the individual ground pole from a voltage ratio, a connection point of the ground wire with the other end of the lead wire;
Impedance between the existing equipment, high impedance near the frequency of the AC signal used to measure the ground resistance of the individual grounding pole, high impedance near the commercial frequency, to measure the ground resistance by low impedance. Ground resistance measurement method.
極とを接続する接地線に一端が接続されたリード線と、
一端が開放され大地との間に容量結合されるように配設
されるリターン導線と、前記リード線の他端と前記リタ
ーン導線の他端との間に交流信号を印加した際に、該交
流信号印加前後の時点において測定された電圧比から前
記個別接地極の接地抵抗を測定する計測手段とを有する
接地抵抗測定装置において、 前記接地線における前記リード線の一端との接続点と前
記既存設備との間に前記個別接地極の接地抵抗の測定に
使用する交流信号の周波数近傍では高インピーダンスと
なり、商用周波数近傍では低インピーダンスとなる回路
を挿入したことを特徴とする接地抵抗測定装置。2. A lead wire having one end connected to a ground wire connecting an existing facility and an individual ground electrode buried in the ground,
A return conductor, one end of which is open and disposed so as to be capacitively coupled to the ground, and an AC signal applied between the other end of the lead wire and the other end of the return conductor. A ground resistance measuring device having measuring means for measuring a ground resistance of the individual ground electrode from a voltage ratio measured before and after signal application, wherein a connection point of the ground wire with one end of the lead wire and the existing equipment A circuit having a high impedance near the frequency of the AC signal used for measuring the ground resistance of the individual ground electrode and a low impedance near the commercial frequency.
ード線の一端との接続点と前記既存設備との間に装着さ
れる強磁性体で形成された筒体であることを特徴とする
請求項2に記載の接地抵抗測定装置。3. The circuit according to claim 2, wherein the circuit is a ferromagnetic cylinder formed between the connection point of the ground wire and one end of the lead wire and the existing equipment. Item 3. The earth resistance measuring device according to Item 2.
を特徴とする請求項2に記載の接地抵抗測定装置。4. The ground resistance measuring apparatus according to claim 2, wherein the circuit is an inductance.
とが並列接続された並列回路であることを特徴とする請
求項2に記載の接地抵抗測定装置。5. The ground resistance measuring device according to claim 2, wherein the circuit is a parallel circuit in which an inductance and a capacitance are connected in parallel.
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JP2000325805A JP4028167B2 (en) | 2000-10-25 | 2000-10-25 | Method and apparatus for measuring ground resistance |
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