JPH01143972A - Method for measuring insulation resistance - Google Patents
Method for measuring insulation resistanceInfo
- Publication number
- JPH01143972A JPH01143972A JP30298487A JP30298487A JPH01143972A JP H01143972 A JPH01143972 A JP H01143972A JP 30298487 A JP30298487 A JP 30298487A JP 30298487 A JP30298487 A JP 30298487A JP H01143972 A JPH01143972 A JP H01143972A
- Authority
- JP
- Japan
- Prior art keywords
- output
- current
- transformer
- insulation resistance
- resistance
- 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
- 238000009413 insulation Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 13
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 102100032814 ATP-dependent zinc metalloprotease YME1L1 Human genes 0.000 abstract description 7
- 101800000795 Proadrenomedullin N-20 terminal peptide Proteins 0.000 abstract description 7
- PIRWNASAJNPKHT-SHZATDIYSA-N pamp Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCNC(N)=N)C(N)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CO)NC(=O)[C@H](C)NC(=O)[C@@H](NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](C)N)C(C)C)C1=CC=CC=C1 PIRWNASAJNPKHT-SHZATDIYSA-N 0.000 abstract description 7
- 102000012677 DET1 Human genes 0.000 abstract description 3
- 101150113651 DET1 gene Proteins 0.000 abstract description 3
- 101150066284 DET2 gene Proteins 0.000 abstract 2
- 101000998140 Homo sapiens Interleukin-36 alpha Proteins 0.000 abstract 1
- 101000998126 Homo sapiens Interleukin-36 beta Proteins 0.000 abstract 1
- 101001040964 Homo sapiens Interleukin-36 receptor antagonist protein Proteins 0.000 abstract 1
- 101000998122 Homo sapiens Interleukin-37 Proteins 0.000 abstract 1
- 102100021150 Interleukin-36 receptor antagonist protein Human genes 0.000 abstract 1
- 101100375588 Oryza sativa subsp. japonica YAB2 gene Proteins 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 230000010363 phase shift Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 102100036464 Activated RNA polymerase II transcriptional coactivator p15 Human genes 0.000 description 1
- 101000713904 Homo sapiens Activated RNA polymerase II transcriptional coactivator p15 Proteins 0.000 description 1
- 229910004444 SUB1 Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は活線状態で電路の絶縁抵抗を測定する方法に関
する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for measuring the insulation resistance of an electrical circuit in a live line state.
（従来技術）
従来、１回路や負荷設備の絶縁劣化による漏電等の早期
発見の為には第４図忙示す如き絶縁抵抗測定方法を用い
るのが一般的であった。(Prior Art) Conventionally, it has been common to use an insulation resistance measuring method as shown in FIG. 4 for early detection of electrical leakage due to deterioration of insulation in a circuit or load equipment.
即ち、Ｚなる負荷を有する受電トランスＴの接地線ＬΣ
を周波数ｆｌなる測定用低周波電圧を発振する発擾器Ｏ
８Ｃに接続されたトランスＯＴのコアに貫通させるか、
又は電路Ｌｌ、Ｌ！を上記トランスＯＴのコアに貫通さ
せる等して電路Ｋ Ｖｓｉｏωｔｔ（ωｔ＝２に、ｆｌ
） の電圧を印加し。That is, the grounding line LΣ of the power receiving transformer T with the load Z
An oscillator O that oscillates a low frequency voltage for measurement with a frequency fl
Either pass it through the core of the transformer OT connected to 8C, or
Or electric line Ll, L! is passed through the core of the transformer OT to create an electric line K Vsioωtt (ωt=2, fl
) Apply voltage.
前記接地線もしくは前記電路Ｌｓ、Ｌｔｙａ−貫通せし
めた変流器ＺＣＴ Ｋより電路（ｊＬｖ１機器も含む）
と大地間に存在する絶縁抵抗ＲＯ及び対地靜［容量Ｃｏ
を介して前記接地線に帰還する漏洩電流を検出し、これ
を増幅器ＡＭＰで増幅した後、フィルタｆ” Ｉ Ｌに
加え１周波数す１の成分のみを選択してフィルタの出力
を整流器ＤＢ’Ｉ’に加えて得られろ出力を用いて電路
の絶縁抵抗を一括して測定するものであった。このよう
な被測定回路は第５図に示す如き等価回路で表示するこ
とができる。即ち第５図においてＲｅは被測定電路なら
び罠負荷機器と大地間の総合絶縁抵抗、Ｃｏは同じく対
地静電容量であって。The grounding wire or the electric line Ls, Ltya - the electric line from the current transformer ZCT K passed through (including jLv1 equipment)
Insulation resistance RO and ground resistance [capacitance Co
After detecting the leakage current that returns to the ground line through the filter and amplifying it with the amplifier AMP, in addition to the filter f''IL, only one frequency component is selected and the output of the filter is sent to the rectifier DB'I. The insulation resistance of the electrical circuit can be measured all at once by using the output obtained in addition to In Figure 5, Re is the total insulation resistance between the electrical circuit to be measured, the trap load equipment, and the ground, and Co is the ground capacitance.
ｒは接地線Ｌｘの接地抵抗である。r is the grounding resistance of the grounding line Lx.
同図忙おいて電路に印加した周波数ｆｌの低周波電圧を
Ｖ ｓｉａωｌｉとすれば、接地線ＬＥに帰還する周波
数ｆ１の漏洩電流Ｊ１は
Ｊ １ ＝ （Ａｓｉ！Ｉω１ ｔ ＋Ｂｃｏｓωｘ
ｔ） Ｖ −・−、、、、、■ここで
となる。一般に絶縁抵抗Ｒｏは接地措抗ｒよシ十分大で
あるからＲＯ＞ ｒ又
（ωｏｃｏｒ）”＜１ ・・・・・・・・・ ■
であるならば前記■、■式は
Ｂ主ωＩＣ＋１ ・・・・・・・・・■
となり、漏洩電流工１の整流値Ｖ’Ａ！＋Ｂ！ Ｖを実
測することによりて絶縁抵抗Ｒｏを推定していた。If the low frequency voltage of frequency fl applied to the electric circuit in the same figure is V siaωli, the leakage current J1 of frequency f1 that returns to the grounding line LE is J 1 = (Asi!Iω1 t +Bcosωx
t) V -・-,,,,,■Here it becomes. In general, the insulation resistance Ro is much larger than the grounding resistance r, so RO>r(ωocor)”<1 ・・・・・・・・・ ■
If so, the above formulas ■ and ■ are B main ωIC + 1 ・・・・・・・・・■
Then, the rectification value of leakage current regulator 1 is V'A! +B! Insulation resistance Ro was estimated by actually measuring V.
しかしながら■、■式から明らかなように対地静電容Ｊ
ｉＣｏが大きいとき、又周波数ｆ１が高くなると正確な
絶縁抵抗の推定が困難となり又、接地抵抗ｒが高い時も
同様に推定が困難であった。However, as is clear from equations ■ and ■, the ground capacitance J
When iCo is large or when the frequency f1 becomes high, it becomes difficult to accurately estimate the insulation resistance, and it is similarly difficult to estimate when the grounding resistance r is high.
（本発明の目的）
本発明は従来の問題を解決するものであって、測定用低
周波電圧の周波数が若干高くても、 ］又対地静電容量
が大きくても、又更に接地抵抗が高くても正しく絶縁抵
抗を測定することのできろ方法を枡供することを目的と
する。(Objective of the present invention) The present invention solves the conventional problems, and even if the frequency of the low-frequency voltage for measurement is slightly high, even if the ground capacitance is large, or even if the ground resistance is high. The purpose of this invention is to provide a method that allows accurate measurement of insulation resistance.
（発明の概要）
この目的を達成するために本発明に於いては被測定電路
又はその接地線忙信号注入トランスと変流器とを電磁誘
導或は直接ＶＣ，挿入接続する手段等によシ結合するこ
とによって該電路に。(Summary of the invention) In order to achieve this object, the present invention connects a signal injection transformer and a current transformer to the electrical circuit to be measured or its ground line by means of electromagnetic induction or direct VC, insertion connection, etc. to the electrical path by coupling.
前記注入トランスを介してｆｌ、ｆｔなる互いに異なる
周波数の低周波信号を印加すると共Ｋ。Low frequency signals of different frequencies, fl and ft, are applied through the injection transformer.
前記注入トランス九巻線した信号線より又は前記信号発
生源から直接に得た前記低周波信号を９０度移相したう
えでこれを前記変流器に前記電路とは逆相となる如く貫
通せしめた接続線に印加し、前記変流器中の前記低周波
信号成分が最小となる如く前記接続線に流れる電流を調
整したときの該電流値と前記変流器出力中の当該低周波
信号値とから絶縁抵抗を算出するよう構成する。The low frequency signal obtained directly from the signal line with nine windings of the injection transformer or directly from the signal generation source is phase shifted by 90 degrees, and then passed through the current transformer so as to be in opposite phase to the electric line. the current value and the low frequency signal value in the output of the current transformer when the current flowing through the connection wire is adjusted so that the low frequency signal component in the current transformer is minimized; The structure is configured to calculate the insulation resistance from .
（実施例）
以下１図示した実施例に基づいて本発明の詳細な説明す
るが、その前に本発明の原理について少しく詳細に説明
する。(Example) The present invention will be explained in detail below based on the illustrated embodiment, but before that, the principle of the present invention will be explained in some detail.
即ち、前記■、■式を得るため罠は■式の関係が必要で
あるが、■式は対地静電容量Ｃｏ 。That is, in order to obtain the above-mentioned equations (1) and (2), the relationship of the equation (2) is required for the trap, but the equation (2) is the ground capacitance Co.
接地抵抗ｒ、低周波電圧の周波数の関係に一定の条件な
設ているからこの条件からはずれる場合は■、■式は成
立しない。There are certain conditions in the relationship between the grounding resistance r and the frequency of the low-frequency voltage, so if these conditions are deviated from, equations (1) and (2) will not hold true.
そこで■式の制限をなくせば、■、■式のＡ、Ｂは となる。Therefore, if we remove the restriction on the ■ expression, A and B in the ■ and ■ expressions become becomes.
そこで第３図に示す如く、電路Ｌｌ、Ｌｘを周波数ｆｌ
、ｆｘを夫々発振する発振器０８Ｃ１，０８Ｃｚの出力
を印加し九トランスＯＴのコアに貫通せしめることによ
り電路にＶ３ｉ呻１ ｔ ｅ Ｖｓｉ呻１１の電圧（そ
れぞれ■とするが、必ずしも等しい必要はない）を印加
し、かつ変流器ｚＣＴを電路に貫通させる。トランスＯ
Ｔのコア罠巻線（１ターンであってもよい）することに
よシ得た電圧を９０度移相器に印加し２周波数ｆｌ、ｆ
黛の電圧の位相を９０度シフトし、９０度移相器の出力
電圧６ａｏｓωｔｔ＋ａｃｏｓω鵞を接続線を介して例
えば抵抗Ｒで終端すると共忙、接続線な変流器に逆相と
なる如く貫通きせる。変流器ＺＣＴの出力を増幅器ＡＭ
Ｐで増幅すれば、その出力に得られる周波数ｆ１の電流
成分Ｊｌ′は・・・・・・・・・ ■
となる。ここでｊ １ ’ ００５ω１ｔは抵抗Ｒに流
れる周波数ｆｔの電流である。電流１１′の整流値が最
小となるように抵抗Ｒもしくは電圧ｅの大きさ′ｌｋ調
整する。Therefore, as shown in Fig. 3, the electric lines Ll and Lx are connected to the frequency fl
By applying the outputs of oscillators 08C1 and 08Cz that oscillate , fx, respectively, and passing them through the core of nine transformers OT, the voltages of V3i, te, and Vsi, 11 are applied to the electric circuit (each is assumed to be ■, but they do not necessarily have to be equal) is applied and the current transformer zCT is passed through the electric circuit. Trans O
The voltage obtained by winding the T core trap winding (it may be one turn) is applied to a 90 degree phase shifter to obtain two frequencies fl and f.
By shifting the phase of the current voltage by 90 degrees and terminating the output voltage 6aosωtt+acosω of the 90-degree phase shifter at a resistor R, for example, through a connecting wire, the current transformer can be passed through so that it has an opposite phase. . The output of current transformer ZCT is transferred to amplifier AM
If it is amplified by P, the current component Jl' of frequency f1 obtained in the output will be . Here, j 1 '005ω1t is a current flowing through the resistor R with a frequency ft. The resistance R or the magnitude 'lk of the voltage e is adjusted so that the rectified value of the current 11' is minimized.
上記整流値が最小となる抵抗Ｒを流れる電流をｉｌとす
れば。Let il be the current flowing through the resistor R that minimizes the rectified value.
■式から
となり、このときの最小値工１は
となる。−万増幅器ＡＭＰ出力中に含まれる周波数ｆ！
の成分Ｊ雪′は
・・・・・・・・・ ■
となる。ζこでｉ ！ ’ ＣＯ８ω２ｔ は抵抗ＲＫ
流れる周波数ｆ！の電流である■！′の整流値が最小と
なるように抵抗Ｒもしくは電圧ｅの大きさを調整する。(2) From the formula, the minimum value 1 in this case is. - Frequency f contained in the output of the AMP!
The component J snow' is......■. ζ Here i! 'CO8ω2t is the resistance RK
Flowing frequency f! The current is ■! The resistance R or the magnitude of the voltage e is adjusted so that the rectified value of ' is minimized.
上記整流値が最小となる抵抗Ｒを流れる電流をｉ！とす
れば。The current flowing through the resistor R that minimizes the above rectified value is i! given that.
となり、このときの最小値ｌ！は となる。Then, the minimum value l! teeth becomes.
次に上記測定結果から絶縁抵抗を算出する。Next, insulation resistance is calculated from the above measurement results.
０式から
又０式から
！ ω＊ＣｏＶ
（ω雪Ｃａｒ） ＝−＝−一−１・・・明・・［相］
ｌ！
■、［相］式の比をとると
よりて対地静電容量Ｃｏは
となる。一方［相］、■式から
又＠、［相］式から
■、Φ式よシ
ー・・・・・・・・＠
■式のＣＯを０式に代入し、整理すればとなる。From 0 type to 0 type again! ω*CoV (ω Snow Car) =-=-1-1...light...[phase]
l! (2) Taking the ratio of the [phase] equation, the ground capacitance Co becomes as follows. On the other hand, [phase], from the formula ■, @, from the [phase] formula, ■, from the Φ formula, C... @ Substituting the CO of the ■ formula into the 0 formula, we get the following.
したがって接続線に流れる電流を調整するに当たりもし
、抵抗Ｒの値を調整する場合、０式となる。ここで、Ｒ
１，Ｒ１はそれぞれ０式のＪ□′、０式のＪ、Ｉの整流
値が最小となる抵抗Ｒの値である。Therefore, when adjusting the current flowing through the connection line and adjusting the value of the resistor R, the following equation is obtained. Here, R
1 and R1 are the values of the resistor R at which the rectification values of J□' of the 0 formula and J and I of the 0 formula are minimized, respectively.
一万、抵抗Ｒを固定値とし電圧ｅを調整する場合０式に
おいて。10,000, In the case where the resistance R is a fixed value and the voltage e is adjusted, in formula 0.
ｉｌ ｅｌ
＝＝−・・・・・・・・・ ［相］
凰！ｅ！
となる。ここでｅｌ、ｅ２はそれぞれ０式のＪｌｌの整
流値が最小となる電圧ｅの大きさである。il el ==-・・・・・・・・・ [phase] 凰! e! becomes. Here, el and e2 are the magnitudes of the voltage e at which the rectified value of Jll of equation 0 is the minimum.
上記の如く測定結果１１ｗ１ｌｓ”ｌ＋Ｉｇならひ、、
＝丑を用いてΦ弐にて絶縁抵抗値なω！
らびに印加した低周波電圧の周波数ｆｌ、ｆｔの彫物な
受けず忙正確に測定しうろことが分る。As above, if the measurement result is 11w1ls"l+Ig,...
= Insulation resistance value ω at Φ2 using ox! It can also be seen that the frequencies fl and ft of the applied low-frequency voltage can be measured accurately without any significant changes.
又上記説明では電路に印加した周波数ｆ１゜ｆｚの低周
波の電圧が共に等しくＶとしたが。Furthermore, in the above description, it is assumed that the low frequency voltages of frequency f1°fz applied to the electric circuits are both equal to V.
夫々がＶｌ、Ｖｌのときは［相］、０式のＶをＶｌ 。When each is Vl, Vl is [phase], and V of formula 0 is Vl.
０．０式の■を■２におきかえることにより大地静電容
量Ｃｏは
となシ、絶縁抵抗Ｒｅは
式で与えられろ。ここで１１．１ｇの関係は■もしくは
［相］式で与えられる。Ｖｌ、Ｖｌは一定であるから０
式の演算処理することによシ、絶縁抵抗ＲＯ’Ｙ測定し
うろこと忙なる。0.0 By replacing ■ in the formula with ■2, the ground capacitance Co can be obtained and the insulation resistance Re can be given by the formula. Here, the relationship 11.1g is given by ■ or [phase] equation. Since Vl and Vl are constant, 0
By calculating the equation, the measurement of the insulation resistance RO'Y becomes busy.
第１図は２本発明に於いて用いる装置の一実施例を示す
図である。第３図、第４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 diagram showing an embodiment of the apparatus used in the present invention. The same symbols as in FIGS. 3 and 4 have the same meaning.
同図に於いて、を路へ周波数ｆｌ、ｆｔの互いに等しい
大きさ■の低周波電圧を印加するために１周波数すｔ、
ｆｚを発振する発振器０８Ｃ１゜０８ＣｚをトランスＯ
Ｔのコアの巻線と接続する。In the same figure, in order to apply low frequency voltages of frequencies fl and ft of equal magnitude to the path, one frequency t,
Oscillator 08C1゜08Cz that oscillates fz is connected to transformer O
Connect to the core winding of T.
トランスＯＴには第４図では接ＶＣ線ＬＥが貫通してい
るが、電路Ｌｌ、Ｌｘを共に貫通させても同様Ｋｉ路に
低周波電圧の印加が可能である。Although the contact VC line LE passes through the transformer OT in FIG. 4, it is possible to similarly apply a low frequency voltage to the Ki path even if both the electric lines Ll and Lx pass through the transformer OT.
電路Ｌ！、Ｌ２を貫通する変流器ＺＣ’ｌ’の出力を増
幅器ＡＭＰで増幅し、その出力を周波数ｆ１１式のみを
選択するフィルタＦＩＬｔ 、周波数ｆ２２式のみを選
択するフィルタＦ” Ｉ Ｌ ｔとに入力し、各フィル
タの出力は夫々整流器ＤＥＴ ｔ 、 ＤＥＴｔとに入
力する。トランスＯＴのコアに貫通もしくは巻線して得
る出力導線Ｌｃを９０度移相器ＰＳに印加し１周波数ｆ
ｌ、ｆ＊の両成分の電圧の位相が電路への印加電圧よシ
タ０度移相するようにする。またトランスＯＴの印加電
圧と導線Ｌｃの電圧間の位相推移がない場合は、導線Ｌ
ｃをトランスＯＴの一次側１．即ち発娠器出カから得て
もよい。移相￥ＳＰＳの出力を増幅器ＰＡＭＰ に印加
し、その出力を例えば可変抵抗器Ｒで終端する。かくし
て抵抗Ｒと増幅器ＰＡＭＰの出力を接続する接続線Ｌｐ
には電路への印加電圧よ９９０度移相した電流が成れる
。Electric line L! , the output of the current transformer ZC'l' passing through L2 is amplified by the amplifier AMP, and the output is input to the filter FILt which selects only the frequency f11 equation, and the filter F'' I Lt which selects only the frequency f22 equation. The output of each filter is input to the rectifiers DETt and DETt, respectively.The output conductor Lc obtained by passing through or winding around the core of the transformer OT is applied to the 90 degree phase shifter PS, and one frequency f is applied.
The phases of the voltages of both l and f* components are shifted by 0 degrees from the voltage applied to the electric circuit. In addition, if there is no phase shift between the voltage applied to the transformer OT and the voltage of the conductor Lc,
c on the primary side of the transformer OT. That is, it may be obtained from the gestational organ output. The output of the phase shift \SPS is applied to the amplifier PAMP, and the output is terminated with a variable resistor R, for example. Thus, the connecting line Lp connecting the resistor R and the output of the amplifier PAMP
, a current with a phase shift of 990 degrees from the voltage applied to the circuit is created.
この接続線を変流器ＺＣＴ Ｋ貫通させ、変流器の一次
電流として印加する。このとき接続線に流れる電流が丁
度、ｉｔ！路の大地静電容ｉｔを介して流れる漏洩電流
と逆相となるごとく貫通させる。This connecting wire is passed through the current transformer ZCT K and applied as the primary current of the current transformer. At this time, the current flowing through the connecting wire is exactly it! The leakage current flowing through the path through the ground capacitance it is in reverse phase.
先ず整流器ＤＥＴ １の出力ＯｔＪ’ｌ’ １が最小値
を示すように抵抗Ｒを訴１整し、そのときの抵抗Ｒの値
をＲ１、またこのときの整流器の出力Ｉｌをコンデンサ
ＣＭに記憶させるため、スイッチＳＷをオンリオフする
とと忙よシコンデンサＣＭＫ出力Ｉｓが記憶される。次
に整流器ＤＥＴ ！の出力ＯＵＴ ｔが最小値を示すよ
うに抵抗Ｒを調整し、そのときの抵抗Ｒの値’ＹＲ１１
″！！たそのときの整流器ＤＥＴ ｔの出力なＩ−とす
る。First, adjust the resistor R so that the output OtJ'l'1 of the rectifier DET1 shows the minimum value, and store the value of the resistor R at that time in R1, and the output Il of the rectifier at this time in the capacitor CM. Therefore, when the switch SW is turned on and off, the capacitor CMK output Is is memorized. Next is the rectifier DET! Adjust the resistance R so that the output OUT t shows the minimum value, and the value of the resistance R at that time 'YR11
Let the output of the rectifier DET t at that time be I-.
上記測定値Ｒ１，Ｒ１の比罰な求めることにＣＦｌに設
定する。コンデンサＣＭの出力を引算器ＳＵＢ １の一
方の入力に加える。又係数回路ＣＦ’ｌの出力は具、立
ニーとなるから、これ１２ ω怠
を引算器５ＵＢｌの他の一方の入力に印加するとｉ！
ωｌ
引算器５ＵＢＩの出力はＩ ｔ −石会πＩ ｚとなる
。The above measured values R1 and R1 are set to CFl to obtain the specific values. Add the output of capacitor CM to one input of subtracter SUB1. In addition, since the output of the coefficient circuit CF'l is ``k'' and ``knee'', if this 12 ω is applied to the other input of the subtracter 5UBl, i!
The output of the ωl subtractor 5UBI becomes I t −Ishikai πI z.
これは０式の分子に相当する。又直流電圧Ｅを引算器５
ＬＡＢ ｚの一方の入力に印加する。次に直流電圧Ｅ−
ｙ係数回路ＣＦＩ と同一の値の設定された係数回路Ｃ
Ｆ！ＩＣ印加すると係数回路Ｃｒｔの出力は−１１（Ｉ
ＪＩＢ とな、。ユれヶ引算器ＳＵＢ凰１七ω３シ
２の他の一方の入力に印加すると、引算器５ＵＢｉ１
Ｏ１
！の出力１１ Ｂ （１−＝−）となる。This corresponds to the numerator of formula 0. Also, the DC voltage E is subtracted by the subtractor 5.
Applied to one input of LAB z. Next, the DC voltage E-
Coefficient circuit C set to the same value as y coefficient circuit CFI
F! When IC is applied, the output of coefficient circuit Crt is -11 (I
JIB Tona. When applied to the other input of the yurega subtractor SUB凰17ω3shi2, the subtracter 5UBi1
O1! The output becomes 11 B (1-=-).
１２ ω宏
引算器Ｓ［ＪＢｌの出力を割算器ＤＩＶの一方の入力へ
、又引算器８１ＪＢｘの出力を割算器ＤＩＶの他の入力
端に印加すると１割算器ＤＩＶの出力Ｅ （１−−、−
−）
Ｉ２ ω意
となる。直流電圧Ｅは一定値であるから、上記出力は０
式に相当し、絶縁抵抗ＲＯを測定しうろことＫなる。12 ω Hiroshi When the output of the subtracter S [JBl is applied to one input of the divider DIV and the output of the subtracter 81JBx is applied to the other input terminal of the divider DIV, the output of the divider DIV becomes 1 (1--,-
-) I2 ω meaning. Since the DC voltage E is a constant value, the above output is 0.
This corresponds to the formula, and the insulation resistance RO is measured as K.
第２図は本発明の他の実施例であり、接ＶＣＩｖ３！Ｌ
ｐＫ流れる電流を調整する別の方法を示している。即ち
、９０度移相器ＰＳの出力を利得可変回路Ａ’Ｉ”ｌ’
Ｋ印加し、その出力を増幅器ＰＡＭＰに加え、増幅器
ＰＡＭＰの出力を固定抵抗Ｒで終端する。接続線Ｌｐに
よる機能は第１図の場合と同様である。可変利得回路を
調整することによシ増幅器ＰＡＭＰの出力電圧ｅが変わ
るため［相］式の関係で接続線に電流ｊｌ、１１を流す
ことができる。FIG. 2 shows another embodiment of the present invention, in which VCIv3! L
Another method of adjusting the pK current flowing is shown. That is, the output of the 90 degree phase shifter PS is transferred to the variable gain circuit A'I"l'
K is applied, its output is applied to the amplifier PAMP, and the output of the amplifier PAMP is terminated with a fixed resistor R. The function of the connection line Lp is the same as in the case of FIG. By adjusting the variable gain circuit, the output voltage e of the amplifier PAMP is changed, so that a current jl, 11 can be caused to flow through the connection line in accordance with the [phase] equation.
岡本発明の実施例においては、説明を簡単忙するため、
単相２線式電路の場合を示したが。In the embodiments of Okamoto's invention, in order to simplify the explanation,
The case of a single-phase two-wire electric circuit is shown.
本発明は何らこれに限定されるものでなく、−端接地型
の単相３線式電路、３相３線式電路の場合においても有
効であることは説明を要しないであろう。It is unnecessary to explain that the present invention is not limited to this in any way, and is also effective in the case of a negative end grounded single-phase three-wire electric circuit and a three-phase three-wire electric circuit.
上記説明では周波数ｆｘ 、ｆ＊における■、■式のＡ
、Ｂを得ろために、印加電圧より９０度移相したＢＶｃ
ｏｓωＩｔ又はＢＶｃｏｓω！ｔの電流成分を先ず打消
すことにより得たが、■、＠式の電流Ｊ１’ ｒ Ｊｚ
”ｌ夫々周波数ｆ１．ｆ＊の印加低周波電圧ならびに印
加低周波電圧よ９９０度移相した電圧で夫々同期検波す
ることにより周波数ｆ！＋ ｆ ２ におけるＡ、Ｂ
を夫々測定可能であるから、これを用いて絶縁抵抗ＲＯ
を測定することも可能である。In the above explanation, A of formula ■ and ■ at frequency fx and f*
, B with a phase shift of 90 degrees from the applied voltage.
osωIt or BVcosω! It was obtained by first canceling the current component of t, but the current J1' r Jz of the formula
A, B at frequency f!
Since it is possible to measure each of the insulation resistance RO
It is also possible to measure
（発明の効果）
本発明の方法によれば、接地抵抗が大きくても、正確に
絶縁抵抗の測定が可能である。また印加電圧の周波数を
高くすることが可能なため印加トランスＯＴの小型化が
可能となシ可搬型の測定器を提供することができろ。(Effects of the Invention) According to the method of the present invention, it is possible to accurately measure insulation resistance even if the ground resistance is large. Furthermore, since it is possible to increase the frequency of the applied voltage, it is possible to provide a portable measuring instrument in which the application transformer OT can be made smaller.
第１図は本発明の一実施例を示す図、第２図は本発明の
他の実施例を示す図、第３図は本発明の説明に用いろ図
、第４図は従来の測定方法を示す図、第５図は被測定電
路の等価回路を示す図である。
Ｔ・・・・・・・・・受電トランス、 Ｏ８Ｃ＋
、ｚ・・・・・・・・・発掘器、 ＯＴ・・・・・
・・・・トランス。
ＺＣ’ｌ’・・・・・・・・・変流器、 ＡＭＰ
、ＰｋＭＰ・・・・・・・・・増幅器、 ＦＩＬ
ｌ ２・・・・・・・・・フィルタ１ＪＥＴｓ、ｔ・・
・・・・・・・整流器。
ＣＦｌ、ｚ・・・・・・・・・係数回路、 ５Ｌ
ＩＢ＋、ｇ・・・・・・・・・引算器、 ＤＩＶ
・・・・・・・・・割算器。
ＡＴＴ・・・・・・・・・可変利得回路。
特許出願人 東洋通信機株式会社
第 ｚｔＪ
第 ５ 口Fig. 1 is a diagram showing one embodiment of the present invention, Fig. 2 is a diagram showing another embodiment of the invention, Fig. 3 is a diagram used to explain the present invention, and Fig. 4 is a diagram showing a conventional measuring method. FIG. 5 is a diagram showing an equivalent circuit of the electric circuit to be measured. T・・・・・・Power receiving transformer, O8C+
,z・・・・・・Excavator, OT・・・・・・
····Trance. ZC'l'・・・・・・・・・Current transformer, AMP
, PkMP......Amplifier, FIL
l 2......Filter 1JETs, t...
·······rectifier. CFl, z・・・・・・Coefficient circuit, 5L
IB+, g・・・・・・Subtractor, DIV
・・・・・・・・・Divider. ATT......Variable gain circuit. Patent applicant: Toyo Tsushinki Co., Ltd. No. 5
Claims (4)
変流器とを結合し、該注入トランスを介して前記電路に
周波数ｆ＿１とｆ＿２の低周波電圧を印加すると共に前
記変流器出力中の前記低周波電圧成分を検出することに
よって電路の絶縁抵抗を測定する方法に於いて、前記変
流器には接続線を貫通せしめ、該接続線に前記低周波信
号電流を９０度移相しかつ前記電路とは逆相になる如く
電流値可変手段を介して通電すると共に、前記変流器出
力中の前記低周波信号成分が最小となる時の該各々の信
号成分値と前記接続線に流れる低周波信号電流値とから
当該電路の絶縁抵抗値を算出したことを特徴とする絶縁
抵抗測定方法。(1) An injection transformer and a current transformer are coupled to the electrical line to be measured or the ground line of the electrical line, and low frequency voltages of frequencies f_1 and f_2 are applied to the electrical line via the injection transformer, and the output of the current transformer is applied. In the method of measuring the insulation resistance of an electric circuit by detecting the low frequency voltage component in the current transformer, a connecting wire is passed through the current transformer, and the low frequency signal current is phase-shifted by 90 degrees through the connecting wire. In addition, current is supplied through the current value variable means so that the phase is opposite to that of the current transformer, and the respective signal component values and the connection line when the low frequency signal component in the output of the current transformer is minimized. An insulation resistance measuring method characterized in that an insulation resistance value of the electrical circuit is calculated from a low frequency signal current value flowing through the electrical circuit.
トランスに貫通せしめた信号線によって得ると共に、該
信号線に流れる電流を９０度移相器を介して導出したこ
とを特徴とする特許請求の範囲第１項記載の絶縁抵抗測
定方法。(2) A patent characterized in that the low frequency signal applied to the connection line is obtained by a signal line passing through the injection transformer, and the current flowing through the signal line is derived via a 90 degree phase shifter. An insulation resistance measuring method according to claim 1.
法に於いて上記接続線に流れる電流を調整するに当たり
上記９０°移相した電圧の大きさを調整したことを特徴
とする絶縁抵抗測定方法。(3) In the insulation resistance measuring method according to claim 1 or 2, the magnitude of the 90° phase-shifted voltage is adjusted in adjusting the current flowing through the connection wire. Measuring method.
法において、前記接続線に流れる電流を調整するに当た
り該接続線に直列に挿入した抵抗素子の値を調整したこ
とを特徴とする絶縁抵抗測定方法。(4) In the insulation resistance measuring method according to claims 1 to 3, the insulation resistance is characterized in that when adjusting the current flowing through the connection wire, the value of a resistance element inserted in series with the connection wire is adjusted. How to measure resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30298487A JP2617325B2 (en) | 1987-11-30 | 1987-11-30 | Insulation resistance measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30298487A JP2617325B2 (en) | 1987-11-30 | 1987-11-30 | Insulation resistance measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01143972A true JPH01143972A (en) | 1989-06-06 |
| JP2617325B2 JP2617325B2 (en) | 1997-06-04 |
Family
ID=17915532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30298487A Expired - Lifetime JP2617325B2 (en) | 1987-11-30 | 1987-11-30 | Insulation resistance measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2617325B2 (en) |
-
1987
- 1987-11-30 JP JP30298487A patent/JP2617325B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2617325B2 (en) | 1997-06-04 |
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