JPH01127969A - Measuring method for insulation resistance of hot line circuit - Google Patents
Measuring method for insulation resistance of hot line circuitInfo
- Publication number
- JPH01127969A JPH01127969A JP28587287A JP28587287A JPH01127969A JP H01127969 A JPH01127969 A JP H01127969A JP 28587287 A JP28587287 A JP 28587287A JP 28587287 A JP28587287 A JP 28587287A JP H01127969 A JPH01127969 A JP H01127969A
- Authority
- JP
- Japan
- Prior art keywords
- output
- circuit
- insulation resistance
- signal
- current transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title description 10
- 238000002347 injection Methods 0.000 abstract description 15
- 239000007924 injection Substances 0.000 abstract description 15
- 238000004804 winding Methods 0.000 abstract description 13
- 101710170230 Antimicrobial peptide 1 Proteins 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- HODRFAVLXIFVTR-RKDXNWHRSA-N tevenel Chemical compound NS(=O)(=O)C1=CC=C([C@@H](O)[C@@H](CO)NC(=O)C(Cl)Cl)C=C1 HODRFAVLXIFVTR-RKDXNWHRSA-N 0.000 description 4
- AVKUERGKIZMTKX-NJBDSQKTSA-N ampicillin Chemical compound C1([C@@H](N)C(=O)N[C@H]2[C@H]3SC([C@@H](N3C2=O)C(O)=O)(C)C)=CC=CC=C1 AVKUERGKIZMTKX-NJBDSQKTSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は電路の絶縁抵抗を測定する方法に関する。[Detailed description of the invention] The present invention relates to a method of measuring insulation resistance of an electrical circuit.
（従来技術）
従来活線状態で電路上の絶縁抵抗（電路上に接続された
電子機器等の負荷も含む）を測定する方法として第２図
に示す如き方法がある。(Prior Art) As a conventional method for measuring insulation resistance on a power line (including loads such as electronic devices connected to the power line) in a live line state, there is a method as shown in FIG.
同図に於てｌは一端接地電路であって該電路に注入トラ
ンスＯＴ及び変流器ＺＣＴが接続される。In the figure, l denotes a grounding line at one end, and an injection transformer OT and a current transformer ZCT are connected to this line.
前記注入トランスには巻線Ｎｌ及びＮ！が設けられ、該
巻線ＮＩＫは発振器Ｏ８Ｃが、該巻線Ｎ！には同期検波
器ＭＩＪＬＴの一人カ端が接続される。The injection transformer has windings Nl and N! is provided, the winding NIK is connected to an oscillator O8C, and the winding N! One end of the synchronous detector MIJLT is connected to the terminal.
前記変流器ＺＣＴには巻ｌ１ｌｊＮ ｓが設けられ増幅
器ＡＭＰ ３と接続し、該ＡＭＰ３はフィルタＦと接続
される。更に該フィルタＦは前記同期検波器ＭＬＩＬＴ
の他入力端と接続し、該ＭＵＬＴの出力端はメーターＭ
ｏと接続する。Said current transformer ZCT is provided with a winding l1ljN s and is connected to an amplifier AMP 3, which is connected to a filter F. Furthermore, the filter F is connected to the synchronous detector MLILT.
Connect to the other input terminal, and the output terminal of the MULT is connected to the meter M.
Connect with o.
このように構成した回路に於て発振器Ｏ８Ｃから周波数
ｆ！の低周波電圧を注入トランスＯＴの巻線ＮｓＫ印加
することＫよシ前記注入トランスＯＴを貫通する電路１
と大地間には電圧Ｖｓｉｎ６ｊｌ ｔ （ω１＝２ｔｆ
ｔ ） 力印加すれる。変流Ｂ ＺＣＴの巻線Ｎｓに
検出される出力を増幅器ＡＭＰ３で増幅することＫよシ
その出力には
、 ■ 。In the circuit configured in this way, the frequency f! is output from the oscillator O8C. By applying a low frequency voltage of NsK to the winding NsK of the injection transformer OT, the electric path 1 passing through the injection transformer OT
There is a voltage Vsin6jl t (ω1=2tf
t) Force is applied. The output detected by the winding Ns of the current transformation B ZCT is amplified by the amplifier AMP3.
ｔ ”’ 丁ｓｘｎωｘｔ＋ωｘｃＶｃｏｓωｔｔ
＝ （１１の電流が商用周波数の漏洩電流と共に出力さ
れる。ここでＣは電路１の対地間静電容量である。t ”' dingsxnωxt+ωxcVcosωtt
= (The current of 11 is output together with the leakage current of the commercial frequency. Here, C is the ground capacitance of the electric line 1.
従って該ＡＭＰ３出力を周波数ｆｌ成分を選択するフィ
ルタＦに印加すれば商用周波成分が除去され、前記（１
）式に相当するｉがフィルタの出力として得られる。更
に該フィルタ出力と前記注入トランスＯＴに設けられた
巻線Ｎ！の出力とを同期検波器ＭＵＬＴＫ入力ずれが該
ＭＬＩＬＴ出力は
Ｖ
となシ、前記（２）式に於いて直流分は７「となるから
これをメーターＭｏで表示し絶縁抵抗を測定することが
できる。Therefore, if the AMP3 output is applied to the filter F that selects the frequency fl component, the commercial frequency component is removed, and the (1
) is obtained as the output of the filter. Furthermore, the filter output and the winding N! provided at the injection transformer OT! If the output of the synchronous detector MULTK input deviation is V, the DC component in the above equation (2) will be 7', so this can be displayed with the meter Mo and the insulation resistance can be measured. can.
しかしながら上記方法ではフィルタＦ等に於て周波数ｆ
１の漏洩電流成分の位相が温度等で変化するため、上記
同相成分を安定に取り出すことは困難であり、更に注入
トランスＯＴ 、変流器ＺＣＴは可搬型で操作性のよい
小型のものが要求され、必然的に注入電圧の周波数ｆｌ
を高くする必要があり、フィルタＦの位相特性等を安定
化するために高価なフィルタを準備する必要があった。However, in the above method, the frequency f in filter F etc.
Since the phase of the leakage current component in step 1 changes with temperature, etc., it is difficult to stably extract the in-phase component.Furthermore, the injection transformer OT and current transformer ZCT are required to be small, portable and easy to operate. and necessarily the frequency fl of the injection voltage
Therefore, it was necessary to prepare an expensive filter in order to stabilize the phase characteristics of the filter F.
（発明の目的）
本発明は上述の如き従来の欠点を除去した簡易な絶縁抵
抗測定方法を提案するものである。(Objective of the Invention) The present invention proposes a simple insulation resistance measuring method that eliminates the conventional drawbacks as described above.
（発明の概要）
この目的を達成する為に本発明の絶縁抵抗測定方法は、
一端接地電路を貫通せしめるように設置された注入トラ
ンスを介して電路に低周波の交流電圧を印加するととも
に上記交流電圧を９０°移相させたキャンセル信号を発
生し、前記変流器出力と前記キャンセル信号との差の信
号の整流値が最小となるように前記キャンセル信号の大
きさを詞整し、最小になったときの整流値を用いて絶縁
抵抗を測定するものである。(Summary of the invention) In order to achieve this object, the insulation resistance measuring method of the present invention
A low-frequency AC voltage is applied to the line through an injection transformer installed so as to pass through the grounded line at one end, and a cancellation signal is generated by shifting the phase of the AC voltage by 90°, and the current transformer output and the The magnitude of the cancellation signal is adjusted so that the rectified value of the difference signal from the cancellation signal is minimized, and the insulation resistance is measured using the rectified value when the signal becomes the minimum.
（実施例）
以下本発明を図面に示した実施例に基づいて詳細に説明
する。(Example) The present invention will be described in detail below based on an example shown in the drawings.
第１図は本発明の実施にあたって用いる装置の一実施例
を示すブロック図であって第２図と同一の記号は同一の
意味をもつものとする。FIG. 1 is a block diagram showing an embodiment of the apparatus used in carrying out the present invention, and the same symbols as in FIG. 2 have the same meanings.
同図に於て１は一端接地電路であって該電路１には注入
トランスＯＴ及び変流器ＺＣＴが接続される。In the figure, reference numeral 1 denotes a grounding line at one end, and an injection transformer OT and a current transformer ZCT are connected to the line 1.
前記注入トランス０１°には巻ＩＩＭＮ ｓ及びＮ２が
設置され該巻線Ｎ１は発掘器Ｏ８Ｃが接続する。前記巻
線Ｎｚには移相器ＰＳが接続し、該移相器ＰＳｒｃは可
変利得回路ＧＡが接続し、該可変利得回路ＧＡの出力端
は引算回路５ｔＪＢの一入力端忙接続する。該引算回路
ＳＵＢの他の入力端は前記変流器ＺＣＴと接続した増幅
器ＡＭＰ１ の出力端と接続する。前記引算回路ＳＵＢ
の出力端はフィルタＦと接続し、該フィルタＦの出力端
は整流回路ＤＥＴと接続し、その出力はメーターＭと接
続する。The injection transformer 01° is equipped with windings IIMNs and N2, and the winding N1 is connected to the excavator O8C. A phase shifter PS is connected to the winding Nz, a variable gain circuit GA is connected to the phase shifter PSrc, and an output terminal of the variable gain circuit GA is connected to one input terminal of a subtraction circuit 5tJB. The other input terminal of the subtraction circuit SUB is connected to the output terminal of an amplifier AMP1 connected to the current transformer ZCT. The subtraction circuit SUB
The output end of the filter F is connected to the rectifier circuit DET, and the output end of the filter F is connected to the rectifier circuit DET.
上述の如く構成した回路に於て発掘器Ｏ８Ｃよシ注入ト
ランスＯＴを介して電路にＶ ｓｉｎω！ｔなる信号を
印加すると共に前記変流器ＺＣＴにて検出した出力を増
幅器ＡＭＰＩで増幅し、その出力を引算器ＳυＢの一入
力端に入力する。In the circuit configured as described above, V sinω! A signal t is applied, and the output detected by the current transformer ZCT is amplified by the amplifier AMPI, and the output is input to one input terminal of the subtracter SυB.
一方、前記引算器Ｓ［ＪＢの他の入力端には前記注入ト
ランスに設置され九巻線Ｎ２出力を移相器ＰＳにて９０
’位相を推移させ更に可変利得回路ＧＡ１に介して得た
１ｏｃｏｓω１なるキャンセル信号を入力する。On the other hand, at the other input terminal of the subtractor S[JB, the output of the nine winding N2 installed in the injection transformer is connected to the phase shifter PS at a 90°
'The phase is shifted and the cancellation signal 1ocosω1 obtained through the variable gain circuit GA1 is input.
前記引算器５ＬＡＢ出力を周波数ｆｌを選択するフィル
タＰＫ印加すれば、その出力は・・・・・・・・・（３
）
となシ該出力を整流回路ＤＥＴに印加し・・・・・・・
・・（４）
Ｋ相当する出力を得る。If the filter PK for selecting the frequency fl is applied to the output of the subtracter 5LAB, the output becomes... (3
) Apply the output to the rectifier circuit DET...
...(4) Obtain an output equivalent to K.
従って、整流回路ＤＥＴの出力が最小となるようにキャ
ンセル信号の大きさを前記可変利得回路ＧＡで調整し、
前記第３式右辺第２項が最小となる値
ωｌｃＶ ＝ｉｏ ・・・・・・・・・（５）とな
るようにすれば、この時の前記調整回路ＤＥＴの出力は
Ｖ／Ｒとなり絶縁抵抗を測定できることがわかる。Therefore, the magnitude of the cancellation signal is adjusted by the variable gain circuit GA so that the output of the rectifier circuit DET is minimized,
If the second term on the right side of the third equation is set to the minimum value ωlcV = io (5), the output of the adjustment circuit DET at this time becomes V/R and is isolated. It turns out that resistance can be measured.
即ち、整流回路出力ＤＥＴをメーター等で表示し、この
表示が最小となるように上記調整を行ない、調整後のメ
ータ値を読めばよい。That is, it is sufficient to display the rectifier circuit output DET with a meter or the like, perform the above adjustment so that this display becomes the minimum value, and read the adjusted meter value.
第３図は本発明の実施にあたって用いる装置の他の実施
例を示すものであって前記第１図と同一の記号は同一の
意味をもつものとする。FIG. 3 shows another embodiment of the apparatus used in carrying out the present invention, and the same symbols as in FIG. 1 have the same meanings.
同図に於て前記第１図で示した実施例と異なる点は９０
度移相器ＰＳの出力６ｃｏｓω１ｔを増幅器ＰＡＫ印加
し、該ＰＡ出力を可変抵抗器ｒを接続し、変流器ＺＣＴ
を貫通せしめた導線２に印加することにより引算回路を
用いずに回路を構成した点である。The difference in this figure from the embodiment shown in FIG. 1 is 90.
The output 6cosω1t of the phase shifter PS is applied to the amplifier PAK, the PA output is connected to the variable resistor r, and the current transformer ZCT
The point is that the circuit is constructed without using a subtraction circuit by applying the voltage to the conducting wire 2 passed through it.
このように構成した回路に於て導線２にはアｃｏｓω１
ｔなる電流が流れ該導線２と電路１とを電気的に逆相に
なるように前記導線２を変流器ＺＣＴＫ貫通せしめ、該
変流器ＺＣＴに設けられた巻線Ｎｓからの出力を増幅器
ＡＭＰＩに印加し、該増幅器ＡＭＰＩの出力を周波数ｆ
ｘのみを選択するフィルタＦに印加することによって得
られる該フィルタＦの出力は
・・・・・・・・・（６）
となる。即ち９周波数ｆｘの漏れ電流と抵抗ｒＫ流れる
電流の差が得られる。該フィルタＦ出力を整流回路ＤＥ
Ｔに印加し、ａ抗ｒを調整して前記整流回路１）ＥＴの
出力が最小となるようにすればこの時の整流回路ＤＢＴ
出力は第６式からも明らかなようにＶ／Ｒとなシ絶縁抵
抗を測定できる。In the circuit configured in this way, the conductor 2 has acosω1
The conductor wire 2 is passed through the current transformer ZCTK so that a current t flows through the conductor wire 2 and the electric line 1 so that they are electrically in reverse phase, and the output from the winding Ns provided in the current transformer ZCT is input to an amplifier. AMPI and the output of the amplifier AMPI at a frequency f
The output of the filter F obtained by applying the voltage to the filter F that selects only x is as follows (6). That is, the difference between the leakage current of 9 frequencies fx and the current flowing through resistor rK is obtained. The filter F output is rectified by a rectifier circuit DE.
If the output of the rectifier circuit 1) ET is minimized by applying a voltage to T and adjusting the a resistance r, the rectifier circuit DBT at this time
As is clear from Equation 6, the output can measure the insulation resistance as V/R.
伺、前記変形実施例に於て抵抗器ｒの値を固定し、増幅
器ＰＡの出力電圧ｅｃｏｓωＩｔ の条幅を可変しても
同様の効果を得ることができる。However, in the modified embodiment described above, the same effect can be obtained even if the value of the resistor r is fixed and the width of the output voltage ecosωIt of the amplifier PA is varied.
上述した如く本発明の方法によれば、フィルタＦの位相
特性の影響を受けない為極めて安定した絶縁抵抗の測定
が可能であシ、更にキャンセル信号の可変範囲を大きく
すれば対地静電容量の範囲が著しく大きくても或は注入
周波数ｆｌが若干高くても精度の高い測定が可能となる
。As mentioned above, according to the method of the present invention, it is possible to measure the insulation resistance extremely stably because it is not affected by the phase characteristics of the filter F, and furthermore, by widening the variable range of the cancellation signal, the ground capacitance can be measured. Even if the range is extremely large or the injection frequency fl is slightly high, highly accurate measurement is possible.
（発明の効果）
本発明の絶縁抵抗測定方法は上述した如く機能する為、
簡易な方法で正確且つ測定することが可能である。(Effects of the Invention) Since the insulation resistance measuring method of the present invention functions as described above,
It is possible to measure accurately and with a simple method.
第１図は本発明の実施にあたって用いる装置の構成を示
すブロック図、第２図は従来よシ用いられている方法を
示すブロック図、第３図は本発明の変形実施例を示すブ
ロック図である。
ＯＴ・・・・・・・・・注入トランス、 ＺＣ’
ｌ・・・・・・・・・変流器、 Ｏ８Ｃ・・・・
・・・・・発振器。
ＡＭＰｌ、ＡＭＰ３．）’Ａ・・・・・・・・・増幅器
。
Ｆ・・・・・・・・・フィルタ、 ＭｔＪＬＴ・
・・・・・・・・同期検波器、 ＳＵＢ・・・・
・団・引算回路。
Ｄ Ｅ ’ｒ・・・・・・・・・整流回路、ＰＳ・・・
・・・・・・９０度移相器、 ｒ・・・・・・・・
・抵抗、 Ｎｌ、Ｎｌ、Ｎｓ・・・・・・・・・
巻線、 Ｍ、ＭＱ・−・・・・・・・メーターＧ
Ａ・・・・・・・・・可変利得回路。
１・・・・・・・・・電路、 ２・・・・・・・・
・導線。FIG. 1 is a block diagram showing the configuration of an apparatus used in carrying out the present invention, FIG. 2 is a block diagram showing a method conventionally used, and FIG. 3 is a block diagram showing a modified embodiment of the present invention. be. OT・・・・・・Injection transformer, ZC'
l...Current transformer, O8C...
...oscillator. AMPl, AMP3. )'A......Amplifier. F・・・・・・Filter, MtJLT・
......Synchronous detector, SUB...
- Group/subtraction circuit. D E 'r・・・・・・ Rectifier circuit, PS...
・・・・・・90 degree phase shifter, r・・・・・・・・・
・Resistance, Nl, Nl, Ns...
Winding, M, MQ...Meter G
A......Variable gain circuit. １・・・・・・・・・Electric circuit, ２・・・・・・・・・
・Conducting wire.
Claims (1)
共に、該印加する交流電圧を９０度移相されたキャンセ
ル信号を発生させ、前記電路に結合した変流器の出力と
前記キャンセル信号との差の信号の整流値が最小となる
ように前記キャンセル信号の大きさを調整し、該調整後
に得た前記整流値を用いて絶縁抵抗を測定することを特
徴とする活線回路の簡易絶縁抵抗測定方法。A low-frequency alternating current voltage is applied to an electrical line whose one end is grounded, and a canceling signal is generated by shifting the applied alternating voltage by 90 degrees, and the output of the current transformer coupled to the electrical line and the canceling signal are Simple insulation of a live circuit, characterized in that the magnitude of the cancellation signal is adjusted so that a rectified value of the difference signal is minimized, and the insulation resistance is measured using the rectified value obtained after the adjustment. How to measure resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28587287A JPH01127969A (en) | 1987-11-13 | 1987-11-13 | Measuring method for insulation resistance of hot line circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28587287A JPH01127969A (en) | 1987-11-13 | 1987-11-13 | Measuring method for insulation resistance of hot line circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01127969A true JPH01127969A (en) | 1989-05-19 |
Family
ID=17697127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28587287A Pending JPH01127969A (en) | 1987-11-13 | 1987-11-13 | Measuring method for insulation resistance of hot line circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01127969A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58127172A (en) * | 1982-01-26 | 1983-07-28 | Toyo Commun Equip Co Ltd | Insulation resistance measuring apparatus for electric line with suppressed stray capacity |
-
1987
- 1987-11-13 JP JP28587287A patent/JPH01127969A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58127172A (en) * | 1982-01-26 | 1983-07-28 | Toyo Commun Equip Co Ltd | Insulation resistance measuring apparatus for electric line with suppressed stray capacity |
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