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
- 230000006866 deterioration Effects 0.000 description 1
- 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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