JP3388440B2 - How to measure ground resistance - Google Patents
How to measure ground resistanceInfo
- Publication number
- JP3388440B2 JP3388440B2 JP2000102804A JP2000102804A JP3388440B2 JP 3388440 B2 JP3388440 B2 JP 3388440B2 JP 2000102804 A JP2000102804 A JP 2000102804A JP 2000102804 A JP2000102804 A JP 2000102804A JP 3388440 B2 JP3388440 B2 JP 3388440B2
- Authority
- JP
- Japan
- Prior art keywords
- value
- current
- current transformer
- voltage
- ground
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measurement Of Resistance Or Impedance (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電力供給を止めるこ
となく接地抵抗値を計測する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a ground resistance value without stopping power supply.
【０００２】[0002]
【従来の技術】従来の代表的な接地抵抗の測定原理を、
図１、図２に示す。このように接地極Ｅをトランス端子
から取り外し試験電流用補助極Ｃ、電圧用補助極Ｐを大
地に埋め込み、図２の電位分布図で理解されるように電
位差がフラットな点となるように電極Ｅ、Ｃ間を１０ｍ
以上離し、電極Ｅ、Ｐ間の電圧ｅｘを測定し、Ｃ点に流
れ込む電流ｉを測定し、ｅｘ／ｉ＝Ｒ により接地抵抗
値を求めている。2. Description of the Related Art A typical conventional ground resistance measuring principle is
This is shown in FIGS. In this way, the ground electrode E is removed from the transformer terminal, the test current auxiliary electrode C and the voltage auxiliary electrode P are embedded in the ground, and the electrodes are formed so that the potential difference becomes a flat point as understood from the potential distribution diagram of FIG. 10m between E and C
The voltage e x between the electrodes E and P is measured, the current i flowing into the point C is measured, and the ground resistance value is obtained by e x / i = R.
【０００３】[0003]
【発明が解決しようとする課題】このような従来の方法
では接地線を接地極から取り外し、しかも測定時には二
つの補助電極を大地に埋め込まなければならない。その
ために測定時に電力供給をストップする必要がある。し
かし、近年のように供給がストップされると不都合を生
じる機器が特に多くなっている状況では、測定実施に時
間的な制約を受けることが多く、作業に支障があり、補
助電極埋め込み作業の手間も無視できない大きなもので
あった。In such a conventional method, the ground wire must be removed from the ground electrode, and two auxiliary electrodes must be buried in the ground during measurement. Therefore, it is necessary to stop the power supply during measurement. However, in recent years, when the number of devices that cause inconvenience when the supply is stopped is particularly large, the measurement is often restricted in time, which hinders the work and makes the work of embedding the auxiliary electrode difficult. Was too big to ignore.
【０００４】また、二つの機器のフレーム間を電気的に
接続して等電位とするための等電位ボンディング導体に
関しては、確実に二つの機器フレームが接続されている
かどうかを計測する方法がなかった。Further, regarding the equipotential bonding conductor for electrically connecting the frames of the two devices to each other so as to have the same potential, there is no method for surely measuring whether or not the two device frames are connected. .
【０００５】[0005]
【課題を解決するための手段】上記の課題は本発明によ
れば、電気機器の測定対象接地線に、交流電圧を重畳す
る重畳用変流器と電流値検出用変流器とを挟み込んで配
置し、重畳用変流器により接地線に周波数可変の交流電
圧を重畳し、約１ｋＨｚ乃至３００ｋＨｚ程度の所定範
囲で重畳電圧の周波数を変化させ、前記電気機器の電路
のインダクタンス及び該電路と大地間との静電容量を用
いて共振回路を構成させ、前記検出用変流器により検出
された電流中の重畳された周波数成分を取り出し、該電
流値で前記重畳交流電圧値を割った商を求めて、その最
小値を接地抵抗値とすることにより解決される。According to the present invention, the above object is achieved by inserting a current transformer for superimposing an AC voltage and a current transformer for detecting a current value in a ground wire to be measured of an electric device. arrangement and, by superimposing an AC voltage of variable frequency to the ground line by superimposing the current transformer, changing the frequency of the superposed voltage at a predetermined range <br/> circumference of about 1 k Hz to 300 k Hz, the electric device Electric circuit
Use the inductance of and the capacitance between the circuit and ground
A resonant circuit is formed , the superimposed frequency component in the current detected by the current transformer for detection is taken out, the quotient obtained by dividing the superimposed AC voltage value by the current value is obtained, and the minimum value is grounded. This is solved by setting the resistance value.
【０００６】[0006]
【０００７】また、上記の課題は本発明によれば、３相
電路において３線一括で交流電圧を重畳する重畳用変流
器と電流値検出用変流器とを挟み込んで配置し、重畳用
変流器により周波数可変の交流電圧を重畳し、約１ｋＨ
ｚ乃至３００ｋＨｚ程度の所定範囲で周波数を変化さ
せ、３相電路のインダクタンス及び該電路と大地間との
静電容量を用いて共振回路を構成させ、前記検出用変流
器により検出された電流中の重畳された周波数成分を取
り出し、該電流値で前記重畳交流電圧値を割った商を求
めて、その最小値を接地抵抗値とすることにより解決さ
れる。[0007] According to the aforementioned problems the present invention, arranged by sandwiching a superimposing current transformer and the current value detecting current transformer for superimposing an AC voltage in three-line batch on 3-phase cable smell, superimposed use by superimposing an AC voltage RiAmane wavenumber variable by the current transformer, about 1 k H
the frequency is changed in a predetermined range of approximately z to 300 k Hz, the 3-phase cable and between the inductance and the electric path and the earth
Is a resonance circuit with a capacitance, removed superimposed frequency components in the detected current by the detecting current transformer, seeking quotient obtained by dividing the superimposed AC voltage at said current value, This can be solved by setting the minimum value as the ground resistance value.
【０００８】また、上記の課題は本発明によれば、前項
までの解決手段において、周波数の変化は、変化速度を
一定とし、電流値で重畳交流電圧値を割った商の最小値
をホールドする保持回路に時定数を設け、電路の絶縁状
態に影響されずにトランスのＢ種接地抵抗値を測定する
ことで解決することができる。Further, according to the present invention, in the means for solving the above problems, the frequency change holds the minimum value of the quotient obtained by dividing the superimposed AC voltage value by the current value while keeping the changing speed constant. This can be solved by providing a time constant in the holding circuit and measuring the type B ground resistance value of the transformer without being affected by the insulation state of the electric path.
【０００９】また、上記の課題は本発明によれば、避雷
針用接地線やＡ、Ｃ、Ｄ接地線において、各接地線とＢ
接地線ないし電路の接地相とをリード線付きクリップで
接続させ、該リード線に交流電圧を重畳する重畳用変流
器と電流値検出用変流器とを挟み込んで配置し、重畳用
変流器により周波数可変の交流電圧を重畳し、約１ｋＨ
ｚ乃至３００ｋＨｚ程度の所定範囲で周波数を変化さ
せ、電路のインダクタンス及び該電路と大地間との静電
容量を用いて共振回路を構成させ、前記検出用変流器に
より検出された検出電流値で前記重畳交流電圧値を割っ
た商を求めて、その最小値を接地抵抗値とすることによ
り解決される。Further, according to the present invention, the above-mentioned problem is that in the grounding wire for the lightning rod and the A, C and D grounding wires, each grounding wire and B
A grounding wire or a grounding phase of an electric circuit is connected by a clip with a lead wire, and a current transformer for superimposing an AC voltage on the lead wire and a current transformer for detecting a current value are arranged so as to be sandwiched, and a current transformer for superimposing by the vessel by superimposing an AC voltage of RiAmane wavenumber variable, about 1 k H
the frequency is changed in a predetermined range of approximately z to 300 k Hz, electrostatic and between electrical path inductance and electric path and the earth
A resonance circuit is configured by using a capacitor, a quotient obtained by dividing the superimposed AC voltage value by a detected current value detected by the detection current transformer is obtained, and the minimum value is set as a ground resistance value .
Will be resolved.
【００１０】また、上記の課題は本発明によれば、２台
の機器のフレーム間を接続する等電位ボンディング導体
に重畳用変流器と電流値検出用変流器とを挟み込んで配
置し、重畳用変流器により、周波数可変の交流電圧を重
畳し、約１ｋＨｚ乃至３００ｋＨｚ程度の所定範囲で周
波数を変化させ、機器のフレームと活線間の静電容量、
電路のインダクタンスと静電容量とで構成される共振回
路に流れる電流を前記検出用変流器により検出し、検出
電流値で前記重畳交流電圧値を割った商を求めて、その
最小値を等電位ボンディング抵抗値とすることで解決さ
れる。Further, according to the present invention, the above-mentioned problems are arranged by sandwiching the superimposing current transformer and the current value detecting current transformer in an equipotential bonding conductor that connects the frames of two devices. by superimposing the current transformer, an AC voltage superimposed variable frequency, the frequency is changed in a predetermined range of about 1 k Hz to 300 k Hz, the capacitance between the frame and the hot equipment,
Resonance times that are composed of the inductance and capacitance of the path
The current through the road detected by current transformer for said detecting, seeking quotient obtained by dividing the superimposed AC voltage with the detected current value, is solved by the equipotential bonding resistance The minimum value.
【００１１】[0011]
【発明の実施の形態】交流電路は大地と電路間が分布定
数回路で成り立っている。この分布定数回路は共振周波
数を持っており、この共振周波数に対して電路のインピ
ーダンスは非常に小さな値となる。また、電路は通常第
２種接地線（Ｂ種接地）とトランスと電路と負荷機器と
によって成り立っている。負荷機器はそのフレームを第
３種接地（Ｄ接地）をとり、複数の機器が並列に接続さ
れている。機器フレームは等価的に見て電路に対し静電
容量と絶縁抵抗とが並列に接続されたかたちとなってお
り、電路、負荷機器に対しインダクタンスと大地に対し
ては電路長に応じ、静電容量の大きさが変化した値を持
っている。BEST MODE FOR CARRYING OUT THE INVENTION The AC electric circuit is composed of a distributed constant circuit between the earth and the electric circuit. This distributed constant circuit has a resonance frequency, and the impedance of the electric path has a very small value with respect to this resonance frequency. In addition, the electric line is usually composed of a second type ground wire (type B ground), a transformer, an electric line, and a load device. The load device has its frame connected to the third type ground (D ground), and a plurality of devices are connected in parallel. Equivalently, the equipment frame is such that the capacitance and the insulation resistance are connected in parallel to the electric path, and the electrostatic capacitance and the insulation resistance are connected to the electric path and the load equipment according to the length of the electric path depending on the inductance. It has a changed value of the capacity.
【００１２】ここで、零相電路である接地線に電圧一定
の交流電圧を重畳させ、その周波数を変化させると、特
定周波数で電路全体は共振し、この共振により流れる電
流ｉは重畳電圧ｖを接地抵抗値で割った値に近い値とな
る。Here, when an AC voltage having a constant voltage is superposed on the ground line which is a zero-phase electric path and the frequency is changed, the entire electric path resonates at a specific frequency, and the current i flowing due to this resonance has a superposed voltage v. The value is close to the value divided by the ground resistance value.
【００１３】本発明は前記の理論を用いたものであり、
本発明による接地抵抗の測定方法の要点は、接地線に対
し、重畳用変流器により周波数が自動的に約１ｋＨｚか
ら３００ｋＨｚ程度まで変化する信号を乗せ、電流値検
出用変流器によって接地線に流れる電流値を検出しこの
値で電圧値を割り算し、その商を接地抵抗値とするもの
である。また、電圧が一定で周波数を変化させ、接地線
に流れる電流値を検出し、そのピーク値をホールドさ
せ、この最大値で電圧値を割り算し、その商を接地抵抗
値としてもよい。The present invention is based on the above theory,
The main point of the method for measuring ground resistance according to the present invention is that a signal for automatically changing the frequency from about 1 kHz to about 300 kHz is applied to the ground wire by the current transformer for superposition, and the ground wire is used by the current transformer for current value detection. The value of the current flowing through is detected, the voltage value is divided by this value, and the quotient is used as the ground resistance value. It is also possible to change the frequency while the voltage is constant, detect the value of the current flowing through the ground line, hold the peak value, divide the voltage value by this maximum value, and use the quotient as the ground resistance value.
【００１４】電圧を重畳させるには公知のクランプ型の
変流器を用い、電流を検出するにも同様に、クランプ型
の変流器を用いるようにして、これを測定対象の接地線
等に挟み込んでクランプさせればよい。A known clamp type current transformer is used to superimpose the voltage, and similarly, a clamp type current transformer is also used to detect the current, and this is connected to the ground wire or the like to be measured. Just clamp it by sandwiching it.
【００１５】変流器は、電圧重畳用と電流検出用に別体
としてもよいし、あるいは一体に二つの変流器を内蔵さ
せるようにしてもよい。また、測定結果は各種の表示器
で表示するようにすることができる。The current transformer may be provided separately for voltage superimposition and current detection, or two current transformers may be integrally incorporated. Further, the measurement result can be displayed on various displays.
【００１６】また、電圧を重畳させずに、接地線をター
ミナルから取り外し、ターミナルと接地線間に電圧を印
加してここを流れる電流を検出するようにしてもよい。
この場合には従来の方法に比較し、補助電極を接地する
手間を省くことができるものとなる。Alternatively, the ground wire may be removed from the terminal without superimposing the voltage, and a voltage may be applied between the terminal and the ground wire to detect the current flowing therethrough.
In this case, it is possible to save the labor of grounding the auxiliary electrode as compared with the conventional method.
【００１７】また、電路において零相電流を測定する方
法と同じように、クランプ型の変流器を用い３相電路の
３線一括で電圧を重畳させ、電流を検出することによっ
て接地抵抗を測定することもできる。Further, as in the method of measuring zero-phase current in an electric circuit, a clamp type current transformer is used to superimpose a voltage on all three wires of a three-phase electric circuit, and the current is detected to measure the ground resistance. You can also do it.
【００１８】また、周波数の変化は、変化速度を一定と
し、電流値で重畳交流電圧値を割った商の最小値をホー
ルドする保持回路に時定数を設け、電路の絶縁状態に影
響されずにトランスのＢ種接地抵抗値を測定するように
すればよい。Further, the frequency change has a constant rate of change and is provided with a time constant in the holding circuit for holding the minimum value of the quotient obtained by dividing the superimposed AC voltage value by the current value, without being affected by the insulation state of the electric circuit. It suffices to measure the class B ground resistance value of the transformer.
【００１９】避雷針用接地線やＡ、Ｃ、Ｄ接地線におい
て、各接地線とＢ接地線ないし電路の接地相とをリード
線付きクリップで接続させ、該リード線に交流電圧を重
畳する重畳用変流器と電流値検出用変流器とを挟み込ん
で配置し、重畳用変流器により周波数可変の交流電圧を
重畳し、所定範囲で周波数を変化させ、前記検出用変流
器により検出された検出電流値で前記重畳交流電圧値を
割った商を求めてこの最小値を接地抵抗値とすること
で、Ｂ種接地抵抗値に影響される電路のインダクタンス
と分布静電容量による共振周波数より避雷針用接地線や
Ａ、Ｃ、Ｄ接地線の単独抵抗値を計測することができ
る。In the grounding wire for the lightning rod and the A, C, D grounding wires, each grounding wire and the B grounding wire or the ground phase of the electric path are connected by a clip with a lead wire, and an AC voltage is superimposed on the lead wire. A current transformer and a current transformer for current value detection are arranged so as to be sandwiched, a frequency-variable AC voltage is superimposed by a current transformer for superposition, the frequency is changed within a predetermined range, and the current is detected by the current transformer for detection. By dividing the superimposed AC voltage value by the detected current value and setting this minimum value as the ground resistance value, the resonance frequency due to the inductance of the circuit and the distributed capacitance affected by the class B ground resistance value is calculated. It is possible to measure the individual resistance values of the grounding wire for the lightning rod and the A, C, D grounding wires.
【００２０】前記の接地抵抗を計測する方法を利用し
て、２台の機器のフレーム間を接続する等電位ボンディ
ング導体に重畳用変流器と電流値検出用変流器とを挟み
込んで配置し、重畳用変流器により電圧一定、周波数可
変の交流電圧を重畳し、所定範囲で周波数を変化させ、
機器のフレームと活線間の静電容量、電路のインダクタ
ンスと静電容量とで形成される共振周波数により流れる
電流を前記検出用変流器により検出し、検出電流値で前
記重畳交流電圧値を割った商を求めてこの最小値を等電
位ボンディング抵抗値として利用することもできる。Utilizing the above-mentioned method for measuring the ground resistance, the superimposing current transformer and the current value detecting current transformer are arranged by being sandwiched by equipotential bonding conductors that connect the frames of two devices. , Superimposing the alternating current voltage of constant voltage and variable frequency by the current transformer for superposition, and changing the frequency in the predetermined range,
The current flowing at the resonance frequency formed by the capacitance between the equipment frame and the live line, the inductance of the electric path and the capacitance is detected by the current transformer for detection, and the superimposed AC voltage value is detected by the detected current value. It is also possible to obtain the divided quotient and use this minimum value as the equipotential bonding resistance value.
【００２１】[0021]
【実施例】以下、図面に従って本発明のうち、電圧を一
定で計測する実施例を説明する。図３は第１の実施例に
対応する実施例のブロック図であり、１はフリップフロ
ップ回路、２は単安定マルチバイブレータ回路、３は積
分回路、４はＶ／Ｆコンバータ、５はフィルタ、６はア
ンプ、７は電流検出用変流器、８はフィルタ、９は同期
検出回路、１０はピークホールド回路、１１は演算回
路、１２は表示部、１３はスイッチ、１４は電圧重畳用
変流器である。また、Ａは交流電路、Ｂは電源トランス
２次側、Ｃは機器、ＲＢ は測定すべき電源トランス２
次側の接地抵抗、ＲＤ は機器側の接地抵抗であり、本
図においては、トランス２次側の接地抵抗ＲＢ を測定
すべく、接地線２０に対して電流検出用変流器７、電圧
重畳用変流器１４をクランプさせている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention for measuring a constant voltage will be described below with reference to the drawings. FIG. 3 is a block diagram of an embodiment corresponding to the first embodiment , where 1 is a flip-flop circuit, 2 is a monostable multivibrator circuit, 3 is an integrating circuit, 4 is a V / F converter, 5 is a filter, and 6 Is an amplifier, 7 is a current detection current transformer, 8 is a filter, 9 is a synchronization detection circuit, 10 is a peak hold circuit, 11 is an arithmetic circuit, 12 is a display unit, 13 is a switch, and 14 is a voltage superposition current transformer. Is. Further, A is an AC circuit, B is a power transformer secondary side, C is a device, and R B is a power transformer 2 to be measured.
The secondary side ground resistance, R D, is the equipment side ground resistance. In this figure, in order to measure the transformer secondary side ground resistance R B , the current detecting current transformer 7, relative to the ground line 20, The current transformer 14 for voltage superposition is clamped.
【００２２】このような構成の本実施例の回路におい
て、スイッチ１３をオンすると、フリップフロップ回路
１が動作し、ピークホールド回路１０のゲートが開く。
単安定マルチバイブレータ回路で１回方形波を発生さ
せ、積分回路３で時間軸に対し電圧がゼロから上昇する
波形を作り出し、この電圧を用いてＶ／Ｆコンバータは
入力電圧に応じて周波数を変化させる。アンプ６でこの
周波数が変化する電流を増幅し接地線２０に重畳用変流
器１４を用いて電圧ｖを乗せる。In the circuit of this embodiment having such a configuration, when the switch 13 is turned on, the flip-flop circuit 1 operates and the gate of the peak hold circuit 10 opens.
The monostable multivibrator circuit generates a square wave once, and the integrating circuit 3 creates a waveform in which the voltage rises from zero with respect to the time axis. Using this voltage, the V / F converter changes the frequency according to the input voltage. Let The amplifier 6 amplifies the current of which the frequency changes, and the voltage v is applied to the ground line 20 by using the superimposing current transformer 14.
【００２３】電流検出用変流器７によって接地線に流れ
る電流ｉを検出し、フィルタ８で商用周波数成分をカッ
トし、同期検出回路９により重畳周波数成分であってし
かも同相分を検出する。ピークホールド回路１０により
このピーク値を保持する。演算回路１１によって、ｖ／
ｉを求めてこれを接地抵抗値として表示部１２によって
表示させる。The current detecting current transformer 7 detects the current i flowing through the ground line, the filter 8 cuts off the commercial frequency component, and the sync detection circuit 9 detects the superimposed frequency component and the in-phase component. The peak hold circuit 10 holds this peak value. By the arithmetic circuit 11, v /
i is obtained and displayed as the ground resistance value on the display unit 12.
【００２４】図４は前記回路の要部の等価回路であり、
Ｌは電路のインダクタンス、ｒは電路の直流抵抗、
Ｃ０、Ｃ１、Ｃはそれぞれ電路の静電容量の分布定数で
ある。FIG. 4 is an equivalent circuit of the main part of the above circuit,
L is the inductance of the circuit, r is the DC resistance of the circuit,
C 0 , C 1 and C are distribution constants of the capacitance of the electric path, respectively.
【００２５】重畳電圧の周波数をｆとし、共振周波数、
ｆ＝１／２π（ＬＣ）１／２の周波数の場合、通常ＲＢ
≫ｒよりｖ／ｉは ≒ＲＢとなる。When the frequency of the superimposed voltage is f, the resonance frequency is
f = 1 / 2π (LC) 1/2 frequency is usually R B
V / i than »r becomes ≒ R B.
【００２６】なお、前記の実施例では、接地抵抗ＲＢを
測定すべく接地線２０に対して電流検出用変流器７、電
圧重畳用変流器１４をクランプさせて測定しているが、
接地抵抗ＲＤを測定するには接地線３０に対して電流検
出用変流器７、電圧重畳用変流器１４をクランプさせて
測定すればよい。In the above embodiment, the current detection current transformer 7 and the voltage superposition current transformer 14 are clamped with respect to the ground wire 20 in order to measure the ground resistance R B.
In order to measure the ground resistance R D , the current detecting current transformer 7 and the voltage superimposing current transformer 14 may be clamped with respect to the ground line 30.
【００２７】以上のような本発明の方法を用いて実測し
た例を次に示す。図５が実測例の回路であり、設備が古
く絶縁不良箇所のある電路を選び３相電路及び単相電路
においてそれぞれ測定した。接地抵抗値ＲＢは従来の測
定方法によれば２．５Ωであるが、３相電路でのクラン
プ式の本発明の方法によれば、２．７Ω、また、単相電
路におけるクランプ式の本発明の方法によれば、２．９
Ωとなり、若干従来の方法より大きい値となるが、電路
抵抗が加算された値程度の上昇値となり真値に近い。な
お、３相電路では重畳交流電圧の周波数は４０ｋＨｚ
で、また、単相電路においては５０ｋＨｚで電流値は最
大を示した。An example of actual measurement using the method of the present invention as described above will be shown below. FIG. 5 is a circuit of an actual measurement example, and an electric circuit with old equipment and a defective insulation portion was selected and measured in each of the three-phase electric circuit and the single-phase electric circuit. The ground resistance value R B is 2.5Ω according to the conventional measuring method, but 2.7Ω according to the method of the present invention of the clamp type in the three-phase electric circuit, and the clamp type book in the single-phase electric circuit. According to the method of the invention, 2.9
Ω, which is slightly higher than the value obtained by the conventional method, but is an increased value of the value obtained by adding the circuit resistance, which is close to the true value. The frequency of the superimposed AC voltage is 40 kHz in the three-phase circuit.
In the single-phase electric circuit, the current value showed a maximum at 50 kHz.
【００２８】図８は本発明の第２の実施例に対応する要
部のブロック図例である。本発明においては、図８
（Ａ）のような電源トランス２次側の接地抵抗ＲＢ を
測定するにあたり、電源トランス２次側Ｂの接地ターミ
ナルＴを取り外し、図８（Ｂ）のように取り外した両端
に電圧一定、周波数可変の交流電圧を印加し、所定範囲
で周波数を変化させた場合の接地線を流れる電流の最大
値を検出するとともにこれをホールドし、該ホールドさ
れた最大電流値で前記一定の重畳交流電圧値を割った商
を求めて接地抵抗値とするものである。電圧を一定とし
ない場合は、検出電流値で前記重畳交流電圧値を割った
商を求めて、この最小値を求めると、これが接地抵抗値
となる。これらの方法によれば、従来の方法よりも補助
電極を設置する手間を省くことができる。FIG. 8 is an example of a block diagram of a main part corresponding to the second embodiment of the present invention. In the present invention, FIG.
In measuring the ground resistance R B on the secondary side of the power transformer as shown in (A), the ground terminal T on the secondary side B of the power transformer is removed, and a constant voltage and frequency are applied across the removed terminals as shown in FIG. 8 (B). Detecting the maximum value of the current flowing through the ground line when a variable AC voltage is applied and changing the frequency within a predetermined range, and holding this value, and the constant superimposed AC voltage value at the held maximum current value. The quotient divided by is used as the ground resistance value. If the voltage is not constant, the quotient obtained by dividing the superimposed AC voltage value by the detected current value and the minimum value are obtained, and this is the ground resistance value. According to these methods, it is possible to save the labor of installing the auxiliary electrode as compared with the conventional method.
【００２９】図９は本発明の第３の実施例に対応する要
部のブロック図例である。本発明においては、３相電路
Ａに対し３線一括して電流検出用変流器７及び電圧重畳
用変流器１４をクランプして配置し、電圧重畳用変流器
１４により電圧一定、周波数可変の交流電圧を印加し、
接地線を流れる電流を電流検出用変流器７によって検出
し、電圧重畳用変流器１４の重畳周波数を所定範囲で周
波数を変化させた場合の接地線を流れる電流の最大値を
検出しこれをホールドし、該ホールドされた最大電流値
で前記一定の重畳交流電圧値を割った商を求めて接地抵
抗値とするものである。FIG. 9 is an example of a block diagram of an essential part corresponding to the third embodiment of the present invention. In the present invention, the current detecting current transformer 7 and the voltage superimposing current transformer 14 are clamped and arranged for the three-phase electric circuit A in three lines at a time, and the voltage superimposing current transformer 14 is used to maintain a constant voltage and frequency. Apply a variable AC voltage,
The current flowing through the ground wire is detected by the current detecting current transformer 7, and the maximum value of the current flowing through the ground wire is detected when the frequency of the superimposed frequency of the voltage superimposing current transformer 14 is changed within a predetermined range. Is held, and the constant superimposed AC voltage value is divided by the held maximum current value to obtain a quotient, which is used as the ground resistance value.
【００３０】本発明の第４の実施例に対応する回路のブ
ロック図等は省略したが、本発明によれば、避雷針用接
地線やＡ、Ｃ、Ｄ接地線において、各接地線とＢ接地線
ないし電路の接地相とをリード線付きクリップで接続さ
せ、該リード線に交流電圧を重畳する重畳用変流器と電
流値検出用変流器とを挟み込んで配置し、重畳用変流器
により、周波数可変の交流電圧を重畳し、所定範囲で周
波数を変化させ、前記検出用変流器により検出された検
出電流値で前記重畳交流電圧値を割った商を求めてその
最小値を求めて接地抵抗値とすることによって、Ｂ種接
地抵抗値に影響される電路のインダクタンスと分布静電
容量による共振周波数より避雷針接地線や、Ａ、Ｃ、Ｄ
種接地線の単独抵抗値を計測することができる。Although the block diagram of the circuit corresponding to the fourth embodiment of the present invention is omitted, according to the present invention, in the grounding wire for the lightning rod and the A, C, D grounding wires, each grounding wire and B grounding are provided. A wire or a ground phase of an electric path is connected by a clip with a lead wire, and a current transformer for superimposing an AC voltage and a current transformer for detecting a current value are arranged so as to be sandwiched between the lead wire and a current transformer for superimposing. By superposing the variable frequency alternating voltage, the frequency is changed within a predetermined range, and the quotient obtained by dividing the superimposed alternating voltage value by the detected current value detected by the detecting current transformer is obtained to obtain the minimum value. By setting the ground resistance value as a grounding resistance value, the lightning conductor ground wire, A, C, D
The single resistance value of the seed ground wire can be measured.
【００３１】図６は本発明の第５の実施例であり、非接
地局部的等電位ボンディングの抵抗値を測定するもので
ある。図のように第１の機器４１と第２の機器４２との
両者のフレーム間を接続する等電位ボンディング導体４
０に重畳、検出変流器内蔵の装置４３を挟み込み計測す
るが、図７の回路の等価回路のように周波数ｆを変化さ
せると共振点があり、そのときの電流ｉは電路の抵抗値
ｒとボンディング導体の抵抗値Ｒの和から決まり、等電
位状態が計測できる。ピーク電流値が得られる周波数よ
り絶縁状態、等電位ボンディング導体と機器との接触状
態も確認できる。FIG. 6 shows a fifth embodiment of the present invention, in which the resistance value of ungrounded local equipotential bonding is measured. As shown in the figure, an equipotential bonding conductor 4 for connecting the frames of both the first device 41 and the second device 42.
The measurement is performed by sandwiching the device 43 with a built-in detection current transformer by superimposing it on 0, but when the frequency f is changed like the equivalent circuit of the circuit of FIG. 7, there is a resonance point, and the current i at that time is the resistance value r of the electric path. The equipotential state can be measured by the sum of the resistance value R of the bonding conductor and the resistance value R of the bonding conductor. The insulation state and the contact state between the equipotential bonding conductor and the device can also be confirmed from the frequency at which the peak current value is obtained.
【００３２】[0032]
【発明の効果】以上のように本発明によれば、測定対象
接地線に、交流電圧を重畳する重畳用変流器と電流値検
出用変流器とを挟み込んで配置し、重畳用変流器により
接地線に、周波数可変の交流電圧を重畳し、所定範囲で
重畳電圧の周波数を変化させ、前記検出用変流器により
検出された電流中の重畳された周波数成分を取り出し、
該電流値で前記重畳交流電圧値を割った商を求めてその
最小値を接地抵抗値とするようにしたので、従来のよう
に接地抵抗を測定するために電力供給を停止する必要が
なく、実施時間の制約もなくなり、効率的な作業ができ
る。As described above, according to the present invention, the superimposing current transformer for superimposing an AC voltage and the current value detecting current transformer are arranged so as to be sandwiched on the ground wire to be measured, and the superimposing current transformer is arranged. The variable voltage AC voltage is superimposed on the ground line by the transformer, the frequency of the superimposed voltage is changed within a predetermined range, and the superimposed frequency component in the current detected by the current transformer for detection is taken out.
Since the quotient obtained by dividing the superimposed AC voltage value by the current value is obtained and the minimum value is set as the ground resistance value, it is not necessary to stop the power supply to measure the ground resistance as in the conventional case, Efficient work can be performed without the restriction of implementation time.
【００３３】また、補助電極の設置も不要であるので、
作業工数も低減させることができるものとなった。Since it is not necessary to install an auxiliary electrode,
The work man-hour can be reduced.
【００３４】[0034]
【００３５】また、本発明は、３相電路に対し３線一括
でクランプする方法を用いることができ、あるいは、避
雷針用接地線やＡ、Ｃ、Ｄ接地線において、各接地線と
Ｂ接地線ないし電路の接地相とをリード線付きクリップ
で接続させ、該リード線に交流電圧を重畳する重畳用変
流器と電流値検出用変流器とを挟み込んで配置し、Ｂ種
接地抵抗値に影響される電路のインダクタンスと分布静
電容量による共振周波数より避雷針用接地線やＡ、Ｃ、
Ｄ接地線の単独抵抗値を計測することに利用することが
でき、ともに効率的な作業を行うことができる。Further, the present invention can use a method of collectively clamping three wires to a three-phase electric circuit, or, in a grounding wire for a lightning rod or A, C, D grounding wires, each grounding wire and B grounding wire. Or the ground phase of the electric circuit is connected by a clip with a lead wire, and a current transformer for superimposing an AC voltage on the lead wire and a current transformer for detecting a current value are arranged so as to be sandwiched, and a class B ground resistance value is obtained. The grounding wire for the lightning rod, A, C,
It can be used to measure the single resistance value of the D grounding wire, and can perform efficient work together.
【００３６】また、接地抵抗を測定する本発明の方法を
利用して、等電位ボンディング導体の抵抗値を計測する
ことも可能であり、絶縁状態、ボンディング導体と機器
との接触状態も確認できる効果もある。Further, the resistance value of the equipotential bonding conductor can be measured by utilizing the method of the present invention for measuring the ground resistance, and the insulation state and the contact state between the bonding conductor and the device can be confirmed. There is also.
【図１】一般的な接地抵抗値測定方法の原理図である。FIG. 1 is a principle diagram of a general ground resistance value measuring method.
【図２】同上の電位分布図である。FIG. 2 is a potential distribution diagram of the above.
【図３】本発明の実施例のブロック図である。FIG. 3 is a block diagram of an embodiment of the present invention.
【図４】同上の等価回路図である。FIG. 4 is an equivalent circuit diagram of the above.
【図５】本発明の実測例のブロック図である。FIG. 5 is a block diagram of an actual measurement example of the present invention.
【図６】本発明のブロック図である。FIG. 6 is a block diagram of the present invention.
【図７】同上の等価回路図である。FIG. 7 is an equivalent circuit diagram of the above.
【図８】（Ａ）、（Ｂ）は本発明の実測例のブロック図
である。8A and 8B are block diagrams of an actual measurement example of the present invention.
【図９】本発明の実施例のブロック図である。FIG. 9 is a block diagram of an embodiment of the present invention.
１ フリップフロップ回路 ２ 単安定マルチバイブレータ回路 ３ 積分回路 ４ Ｖ／Ｆコンバータ ５ フィルタ ６ アンプ ７ 電流値検出用変流器 ８ フィルタ ９ 同期検波回路 １０ ピークホルド回路 １１ 演算回路 １２ 表示部 １３ スイッチ １４ 重畳用変流器 ２０ 接地線 ３０ 接地線 ＲＢ 電源トランス２次側の接地抵抗（Ｂ種接地抵抗） ＲＤ 機器側の接地抵抗（Ｄ種接地抵抗） Ａ 交流電路 Ｂ 電源トランス２次側 Ｃ 機器1 Flip-Flop Circuit 2 Monostable Multivibrator Circuit 3 Integrating Circuit 4 V / F Converter 5 Filter 6 Amplifier 7 Current Detecting Current Transformer 8 Filter 9 Synchronous Detection Circuit 10 Peak Hold Circuit 11 Arithmetic Circuit 12 Display 13 Switch 14 Superimposition Current transformer 20 Ground wire 30 Ground wire R B Power transformer secondary side ground resistance (class B ground resistance) RD Equipment side ground resistance (class D ground resistance) A AC circuit B Power transformer secondary side C equipment
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01R 27/20 G01R 27/02 G01R 31/02 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G01R 27/20 G01R 27/02 G01R 31/02
Claims (5)
を重畳する重畳用変流器と電流値検出用変流器とを挟み
込んで配置し、重畳用変流器により接地線に周波数可変
の交流電圧を重畳し、約１ｋＨｚ乃至３００ｋＨｚ程度
の所定範囲で重畳電圧の周波数を変化させ、前記電気機
器の電路のインダクタンス及び該電路と大地間との静電
容量を用いて共振回路を構成させ、前記検出用変流器に
より検出された電流中の重畳された周波数成分を取り出
し、該電流値で前記重畳交流電圧値を割った商を求め
て、その最小値を接地抵抗値とすることを特徴とする接
地抵抗の測定方法。1. A grounding wire to be measured of an electric device is arranged with a current transformer for superimposing an AC voltage and a current transformer for detecting a current value sandwiched therebetween, and the frequency is varied by the current transformer for superimposing on the grounding wire. of the AC voltage superimposed to, changing the frequency of the superposed voltage at a predetermined range of about 1 k Hz to 300 k Hz, the electric motor
Inductance of the electric circuit of the container and the static electricity between the electric circuit and the earth
A resonance circuit is configured by using a capacitance, the superimposed frequency component in the current detected by the current transformer for detection is taken out, the quotient obtained by dividing the superimposed AC voltage value by the current value is obtained, and the minimum A method for measuring ground resistance, wherein the value is the ground resistance value.
重畳する重畳用変流器と電流値検出用変流器とを挟み込
んで配置し、重畳用変流器により周波数可変の交流電圧
を重畳し、約１ｋＨｚ乃至３００ｋＨｚ程度の所定範囲
で周波数を変化させ、３相電路のインダクタンス及び該
電路と大地間との静電容量を用いて共振回路を構成さ
せ、前記検出用変流器により検出された電流中の重畳さ
れた周波数成分を取り出し、該電流値で前記重畳交流電
圧値を割った商を求めて、その最小値を接地抵抗値とす
ることを特徴とする接地抵抗の測定方法。2. In a three-phase electric circuit, a superposition current transformer that superimposes an AC voltage in a bundle of three wires and a current value detection current transformer are arranged so as to be sandwiched, and a frequency variable AC voltage is generated by the superposition current transformer. superimposed, the frequency is changed in a predetermined range of about 1 k Hz to 300 k Hz, the 3-phase cable inductance and the
A resonant circuit is constructed using the capacitance between the circuit and ground.
Then, the superimposed frequency component in the current detected by the current transformer for detection is taken out, the quotient obtained by dividing the superimposed AC voltage value by the current value is obtained, and the minimum value is taken as the ground resistance value. A method for measuring earth resistance, characterized by.
電流値検出用変流器の出力の最大電流値をホールドする
保持回路に時定数を設け、電路の絶縁状態に影響されず
にトランスのＢ種接地抵抗値を測定することを特徴とす
る請求項１又は２に記載の接地抵抗の測定方法。3. The change in frequency makes the changing speed constant,
A holding circuit for holding the maximum current value of the output of the current value detecting current transformer is provided with a time constant, and the class B ground resistance value of the transformer is measured without being affected by the insulation state of the electric path. 1. The method for measuring the ground resistance according to 1 or 2 .
いて、各接地線とＢ接地線ないし電路の接地相とをリー
ド線付きクリップで接続させ、該リード線に交流電圧を
重畳する重畳用変流器と電流値検出用変流器とを挟み込
んで配置し、重畳用変流器により周波数可変の交流電圧
を重畳し、約１ｋＨｚ乃至３００ｋＨｚ程度の所定範囲
で周波数を変化させ、電路のインダクタンス及び該電路
と大地間との静電容量を用いて共振回路を構成させ、前
記検出用変流器により検出された検出電流値で前記重畳
交流電圧値を割った商を求めて、その最小値を接地抵抗
値とすることを特徴とする接地抵抗の測定方法。4. In a lightning rod ground wire or A, C, D ground wires, each ground wire is connected to a B ground wire or a ground phase of an electric circuit by a clip with a lead wire, and an AC voltage is superimposed on the lead wire. place sandwiches the superimposing current transformer and the current value detecting current transformer, by superimposing an AC voltage of a frequency variable by superimposing the current transformer, a frequency in a predetermined range of about 1 k Hz to 300 k Hz Changing the inductance of the circuit and the circuit
The resonance circuit is configured by using the electrostatic capacitance between the ground and the ground, and the quotient obtained by dividing the superimposed AC voltage value by the detected current value detected by the detecting current transformer is obtained, and the minimum value is the ground resistance. A method of measuring the ground resistance, which is characterized by a value.
電位ボンディング導体に重畳用変流器と電流値検出用変
流器とを挟み込んで配置し、重畳用変流器により周波数
可変の交流電圧を重畳し、約１ｋＨｚ乃至３００ｋＨｚ
程度の所定範囲で周波数を変化させ、機器のフレームと
活線間の静電容量、電路のインダクタンスと静電容量と
で構成される共振回路に流れる電流を前記検出用変流器
により検出し、検出電流値で前記重畳交流電圧値を割っ
た商を求めて、その最小値を等電位ボンディング抵抗値
とすることを特徴とする抵抗値の測定方法。5. An alternating current whose frequency is variable by the superimposing current transformer, wherein the superimposing current transformer and the current value detecting current transformer are sandwiched by equipotential bonding conductors connecting the frames of a plurality of devices. superimposed voltage, about 1 k Hz to 300 k Hz
The frequency is changed in a predetermined range of degrees, it detects the electrostatic capacitance between the frame and the hot equipment, the current through the resonant circuit composed of the inductance and capacitance of paths by the detecting current transformer A method for measuring a resistance value, wherein a quotient obtained by dividing the superimposed AC voltage value by a detected current value is obtained, and the minimum value is set as an equipotential bonding resistance value.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000102804A JP3388440B2 (en) | 2000-02-29 | 2000-02-29 | How to measure ground resistance |
| CNB001369717A CN1163758C (en) | 2000-02-29 | 2000-12-29 | Method for testing earthing resistance |
| HK02100367.3A HK1038796B (en) | 2000-02-29 | 2002-01-17 | Method of earth-resistance measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000102804A JP3388440B2 (en) | 2000-02-29 | 2000-02-29 | How to measure ground resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001242206A JP2001242206A (en) | 2001-09-07 |
| JP3388440B2 true JP3388440B2 (en) | 2003-03-24 |
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ID=18616613
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|---|---|---|---|
| JP2000102804A Expired - Fee Related JP3388440B2 (en) | 2000-02-29 | 2000-02-29 | How to measure ground resistance |
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| Country | Link |
|---|---|
| JP (1) | JP3388440B2 (en) |
| CN (1) | CN1163758C (en) |
| HK (1) | HK1038796B (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5475316B2 (en) * | 2009-04-28 | 2014-04-16 | 光商工株式会社 | Ground resistance measurement method |
| CN101833041B (en) * | 2010-02-10 | 2012-09-05 | 上海奥波电子有限公司 | Method for detecting resistance of DC permanent magnet brush motor |
| US9020685B2 (en) | 2010-02-23 | 2015-04-28 | Honda Motor Co., Ltd. | Method of measuring contact failure and contact failure measuring device |
| KR101123539B1 (en) | 2010-07-09 | 2012-03-16 | 한국해양대학교 산학협력단 | A High Precision Ground Impedance Measurement Device |
| KR101479436B1 (en) * | 2011-03-24 | 2015-01-05 | 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 | Ground fault detection circuit |
| FR2975498B1 (en) * | 2011-05-19 | 2014-02-14 | Renault Sa | DEVICE AND METHOD FOR ESTIMATING THE RESISTANCE OF EARTH CONNECTION OF AN ELECTRICAL APPARATUS |
| JP5662251B2 (en) * | 2011-06-02 | 2015-01-28 | 鹿島建設株式会社 | Grounding method in tunnel construction |
| CN102636722B (en) * | 2012-04-27 | 2014-12-10 | 广东电网公司肇庆供电局 | Detection device for preventing switching-on of grounding wires |
| CN103123375B (en) * | 2012-09-15 | 2015-07-08 | 华北电力大学（保定） | Temporary ground wire detection device for substation |
| CN102944750A (en) * | 2012-11-21 | 2013-02-27 | 昆山北极光电子科技有限公司 | On-line measuring method for insulation resistance of generator |
| CN103472352B (en) * | 2013-09-16 | 2016-11-23 | 国家电网公司 | A kind of ground wire testing method |
| CN104749476A (en) * | 2013-12-25 | 2015-07-01 | 国家电网公司 | Grounding detection device and grounding detection method |
| JP6433305B2 (en) * | 2014-04-09 | 2018-12-05 | 矢崎総業株式会社 | Insulation detection device and insulation detection method for non-grounded power supply |
| CN103941097B (en) * | 2014-04-30 | 2016-08-31 | 国家电网公司 | Large ground network earth resistance real-time monitor |
| CN105092981A (en) * | 2014-05-15 | 2015-11-25 | 常州帕斯菲克自动化技术股份有限公司 | Grounding resistor on-line monitor |
| CN105699784A (en) * | 2016-03-16 | 2016-06-22 | 国家电网公司 | Device for measuring grounding grid resistance by using voltage superposition method |
| CN105785135A (en) * | 2016-04-11 | 2016-07-20 | 国网安徽省电力公司电力科学研究院 | Frequency conversion ground impedometer |
| CN107102207A (en) * | 2016-12-02 | 2017-08-29 | 国家电网公司 | A kind of earth loop impedance test instrument controlled based on microcomputer with signal transacting |
| JP7108919B2 (en) * | 2018-03-28 | 2022-07-29 | パナソニックＩｐマネジメント株式会社 | Circuit monitoring system and distribution system |
| DE102018125004B3 (en) | 2018-10-10 | 2019-12-12 | Bender Gmbh & Co. Kg | Electrical circuit arrangement and method for coupling an insulation monitoring device to an unearthed power supply system |
-
2000
- 2000-02-29 JP JP2000102804A patent/JP3388440B2/en not_active Expired - Fee Related
- 2000-12-29 CN CNB001369717A patent/CN1163758C/en not_active Expired - Fee Related
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2002
- 2002-01-17 HK HK02100367.3A patent/HK1038796B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1163758C (en) | 2004-08-25 |
| JP2001242206A (en) | 2001-09-07 |
| HK1038796B (en) | 2005-05-06 |
| CN1311441A (en) | 2001-09-05 |
| HK1038796A1 (en) | 2002-03-28 |
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