JPH0314144B2 - - Google Patents
Info
- Publication number
- JPH0314144B2 JPH0314144B2 JP56049003A JP4900381A JPH0314144B2 JP H0314144 B2 JPH0314144 B2 JP H0314144B2 JP 56049003 A JP56049003 A JP 56049003A JP 4900381 A JP4900381 A JP 4900381A JP H0314144 B2 JPH0314144 B2 JP H0314144B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- insulation
- current
- side electric
- value
- 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 - Lifetime
Links
- 238000009413 insulation Methods 0.000 claims description 89
- 238000001514 detection method Methods 0.000 claims description 49
- 238000010586 diagram Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 6
- 230000002950 deficient Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Description
【発明の詳細な説明】
本発明は直流電気系統の各部位の絶縁抵抗の値
を、通電状態の下に、測定する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the value of insulation resistance of each part of a DC electrical system under a energized state.
従来、直流電気系統の各部位の絶縁不良を検知
するには、該直流電気系統への通電を停止した上
で、各部位の絶縁抵抗値（以下単に絶縁値とい
う）を一括して測定していた。そのため、通電中
には絶縁不良を検査することが出来ず、発見が遅
れがちであつた。またそのため、絶縁不良の点検
作業は通電停止中に行わざるを得ず、通電停止中
に行われる電気系統の点検作業の手間が増すとい
う欠点があつた。 Conventionally, in order to detect poor insulation in each part of a DC electrical system, the power to the DC electrical system is stopped and the insulation resistance value (hereinafter simply referred to as insulation value) of each part is measured all at once. Ta. Therefore, insulation defects cannot be inspected while electricity is being applied, and detection tends to be delayed. Furthermore, inspection work for insulation defects must be carried out while the power supply is stopped, which has the disadvantage of increasing the effort required to inspect the electrical system while the power supply is stopped.
本発明は、上記の如き従来測定器の欠点に鑑
み、電気系統が通電状態（以後活線状態という）
にある時に、電気系統の各部位、例えばＰ側電路
（高電位側電路）、Ｎ側電路（低電位側電路）ある
いは直流電動機の電機子等の部位の絶縁値を、同
時に区別しつつ測定出来る直流電気系統絶縁抵抗
値測定装置を提供するこを目的とするものであ
る。 In view of the above-mentioned drawbacks of conventional measuring instruments, the present invention has been developed so that the electrical system is in a energized state (hereinafter referred to as a live-line state).
It is possible to simultaneously distinguish and measure the insulation value of each part of the electrical system, such as the P-side circuit (high-potential circuit), N-side circuit (low-potential circuit), or the armature of a DC motor. The object of the present invention is to provide a DC electrical system insulation resistance value measuring device.
以下に本発明に係る直流電気系統絶縁抵抗値測
定装置（以下本発明装置という）を、その実施例
を示す図面に基いて説明する。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A DC electrical system insulation resistance value measuring device according to the present invention (hereinafter referred to as the device of the present invention) will be described below with reference to drawings showing embodiments thereof.
第１図は本発明装置の一実施例を示すブロツク
線図であつた、１は直流電気系統のＰ側電路、２
は同電気系統のＮ側電路、３は該直流電気系統の
直流電源、４は該直流電源３から供給される電力
によつて動作する直流電動機である。５は抵抗
R1と抵抗R2とが直列に接続された抵抗回路であ
つて、Ｐ側電路１とＮ側電路２間に接続されてい
る。なお、該抵抗回路５は３個以上の抵抗が直列
に接続されていてもよい。Ｐは該抵抗回路５の中
間接続点である。Ｑは接地点である。６は２個の
ダイオード等の整流素子６１，６２が逆並列接続
された極性判断回路であつて、前記抵抗回路５の
中間接続点Ｐと接地点Ｑとの間に接続されてい
る。整流素子６１は接地点Ｑから中間接続点Ｐ方
向に流れる電流のみを通し、整流素子６２は中間
接続点Ｐから接地点Ｑ方向に流れる電流のみを通
すものである。７は前記整流素子６１を流れる電
流I1の値を検出するＰ側接地電流検出回路であつ
て、図示実施例においては、整流素子６１に直列
に接続された電流検出用抵抗R3と、該電流検出
用抵抗R3の両端電圧v1を検出する電圧検出回路
７１と、該電圧検出回路７１から出力された電圧
信号v1に基き、前記整流素子６１、電流検出用抵
抗R3を流れる電流I1（＝v1／R3）を演算する電流演
算回路７２とからなるものである。８は前記整流
素子６２を流れる電流I2の値を検出するＮ側接点
電流検出回路であつて、図示実施例においは、整
流素子６２に直列接続された電流検出用抵抗R4
と、該電流検出用抵抗R4の両端電圧v2を検出す
る電圧検出回路８１と、該電圧検出回路８１から
出力された電圧信号v2に基き、前記整流素子６
２、電流検出用抵抗R4を流れる電流I2（＝v2／R4）
を演算する電流演算回路８２とからなるものであ
る。９は前記Ｐ側電路１とＮ側電路２との間の線
間電圧Ｖを検出する線間電圧検出回路である。１
０は該線間電圧検出回路９から出力される線間電
圧信号Ｖと、前記Ｐ側接地電流検出回路７から出
力された電流信号I1と、前記Ｎ側接地電流検出回
路８から出力された電流信号I2を入力し、直流電
気系統のどの部位、例えばＰ側電路１やＮ側電路
２あるいは直流電動機の電機子１２（第７図参
照）等の部位に絶縁不良が有るか無いかを判断
し、且つ該各部位の絶縁値Reを演算する絶縁値
抵抗値演算回路である。該絶縁値抵抗値演算回路
１０は、図示実施例においては次に述べる回路か
ら構成されている。１０１は前記Ｐ側接地検出回
路７から出力された電流信号I1と前記線間電圧検
出回路９から出力された線間電圧信号Ｖを入力
し、それらの信号I1、Ｖに基き、後述する如くし
て、Ｐ側電路１の絶縁値Repを演算するＰ側絶縁
値演算回路である。１０２は、前記Ｎ側接地電流
検出回路８から出力された電流信号I2と前記線間
電圧検出回路９から出力された線間電圧信号Ｖを
入力し、それらの信号I2、Ｖに基き、後述する如
くしてＮ側電路２の絶縁値Reoを演算するＮ側絶
縁値演算回路である。１０４は前記Ｎ側電流検出
回路８から出力された電流信号I2を入力し、電機
子１２の絶縁不良のため生じる電流I2の後述する
如き変動の幅Ｌを演算する変動幅検出回路であつ
て、図示実施例においては直流分をカツトするフ
イルタ１０４′と該フイルタ１０４′から出力され
た信号を整流し平滑化するピーク演算回路１０
４″からなる。１０３は該変動増幅検出回路１０
４から出力された変動幅信号Ｌと、前記線間電圧
信号Ｖを入力し、直流電動機４の電機子１２の絶
縁値Reaを後述する如くして演算する電機子絶縁
値演算回路である。１０５は該電機子絶縁値演算
回路１０３から出力された電機子１２の絶縁値信
号Reaと前記Ｐ側絶縁値演算回路１０１から出力
されるＰ側電路１の絶縁値信号Repと前記Ｎ側絶
縁値演算回路１０２から出力されるＮ側電路２の
絶縁値信号Reoとを入力し、それらの絶縁値Rea、
Rep及びReoの並列和を演算し、直流電気系統の
総合絶縁値Retを出力する総合絶縁値演算回路で
ある。１１は前記絶縁抵抗値演算回路１０から出
力された、直流電気系統の各部位の絶縁値信号
Re（図示実施例においては絶縁値信号Rea、Rep、
Reo、Retである）を入力し、夫々表示警告する絶
縁値表示警告器である。なお、前記Ｐ側接地電流
検出回路７、Ｎ側接地電流検出回路８は公知の電
流検出回路であつても勿論よい。また、線間電圧
検出回路９の入力部と電圧検出回路７１，８１の
入力部を、夫々他の直流電気系統のＰ側、Ｎ側電
路の線間や、該系統に設けておいた電流検出用抵
抗の両端に切換え得るようにすることにより、一
組の線間電圧検出回路９、電圧検出回路７１，８
１、絶縁抵抗値演算回路１０、表示警告器等で、
多くの直流電気系統の絶縁値を容易に測定するこ
とが出来る。 FIG. 1 is a block diagram showing one embodiment of the device of the present invention. 1 is a P-side electrical circuit of a DC electrical system;
3 is a DC power supply of the DC power supply 3, and 4 is a DC motor operated by power supplied from the DC power supply 3. 5 is resistance
It is a resistance circuit in which R 1 and a resistor R 2 are connected in series, and is connected between a P-side electric path 1 and an N-side electric path 2. Note that the resistance circuit 5 may include three or more resistors connected in series. P is an intermediate connection point of the resistance circuit 5. Q is the grounding point. Reference numeral 6 denotes a polarity determination circuit in which two rectifying elements 61 and 62 such as diodes are connected in antiparallel, and is connected between the intermediate connection point P of the resistor circuit 5 and the ground point Q. The rectifying element 61 passes only the current flowing from the grounding point Q in the direction of the intermediate connection point P, and the rectifying element 62 passes only the current flowing from the intermediate connection point P in the direction of the grounding point Q. 7 is a P-side ground current detection circuit that detects the value of the current I 1 flowing through the rectifier 61, and in the illustrated embodiment, it includes a current detection resistor R 3 connected in series to the rectifier 61; A voltage detection circuit 71 detects the voltage v 1 across the current detection resistor R 3 , and a current flows through the rectifying element 61 and the current detection resistor R 3 based on the voltage signal v 1 output from the voltage detection circuit 71. It consists of a current calculation circuit 72 that calculates I 1 (=v 1 /R 3 ). Reference numeral 8 denotes an N-side contact current detection circuit for detecting the value of the current I 2 flowing through the rectifier 62, and in the illustrated embodiment, a current detection resistor R 4 connected in series with the rectifier 62 is used.
, a voltage detection circuit 81 that detects the voltage v 2 across the current detection resistor R 4 , and a voltage detection circuit 81 that detects the voltage v 2 across the current detection resistor R 4 ;
2. The current calculation circuit 82 calculates the current I 2 (=v 2 /R 4 ) flowing through the current detection resistor R 4 . Reference numeral 9 denotes a line voltage detection circuit for detecting the line voltage V between the P side electric line 1 and the N side electric line 2. 1
0 is the line voltage signal V output from the line voltage detection circuit 9, the current signal I1 output from the P-side ground current detection circuit 7, and the current signal I1 output from the N-side ground current detection circuit 8. Input the current signal I 2 and check whether there is an insulation defect in which part of the DC electrical system, for example, the P-side electric line 1, the N-side electric line 2, or the armature 12 of the DC motor (see Figure 7). This is an insulation value resistance value calculation circuit that makes a judgment and calculates the insulation value R e of each part. In the illustrated embodiment, the insulation value resistance value calculation circuit 10 is composed of the following circuits. Reference numeral 101 inputs the current signal I 1 outputted from the P-side grounding detection circuit 7 and the line voltage signal V outputted from the line voltage detection circuit 9, and based on these signals I 1 and V, as will be described later. In this way, the P-side insulation value calculation circuit calculates the insulation value R ep of the P-side electric circuit 1. 102 inputs the current signal I 2 output from the N-side ground current detection circuit 8 and the line voltage signal V output from the line voltage detection circuit 9, and based on these signals I 2 and V, This is an N-side insulation value calculation circuit that calculates the insulation value Reo of the N-side electric circuit 2 as described later. Reference numeral 104 denotes a variation width detection circuit which inputs the current signal I 2 outputted from the N-side current detection circuit 8 and calculates the variation width L of the current I 2 generated due to poor insulation of the armature 12, as described below. In the illustrated embodiment, a filter 104' that cuts a DC component and a peak calculation circuit 10 that rectifies and smoothes the signal output from the filter 104' are used.
4". 103 is the fluctuation amplification detection circuit 10
This is an armature insulation value calculation circuit which inputs the fluctuation width signal L outputted from the DC motor 4 and the line voltage signal V and calculates the insulation value Rea of the armature 12 of the DC motor 4 as described later. Reference numeral 105 indicates the insulation value signal R ea of the armature 12 outputted from the armature insulation value calculation circuit 103, the insulation value signal R ep of the P side electric circuit 1 outputted from the P side insulation value calculation circuit 101, and the N side The insulation value signal R eo of the N-side electric circuit 2 outputted from the insulation value calculation circuit 102 is input, and the insulation values R ea ,
This is a total insulation value calculation circuit that calculates the parallel sum of R ep and Reo and outputs the total insulation value R et of a DC electrical system. 11 is an insulation value signal of each part of the DC electrical system outputted from the insulation resistance value calculation circuit 10;
R e (in the illustrated embodiment, the insulation value signals R ea , R ep ,
This is an insulation value display/warning device that inputs R eo and R et and displays a warning respectively. Note that the P-side ground current detection circuit 7 and the N-side ground current detection circuit 8 may of course be known current detection circuits. In addition, the input part of the line voltage detection circuit 9 and the input part of the voltage detection circuits 71 and 81 can be connected between the lines of the P-side and N-side electric circuits of other DC electrical systems, respectively, or the current detection circuits provided in the system. A pair of line voltage detection circuits 9, voltage detection circuits 71, 8
1. Insulation resistance value calculation circuit 10, display warning device, etc.
The insulation values of many DC electrical systems can be easily measured.
本発明装置は以下に示す如くして直流電気系統
の各部位の絶縁不良を検知し、その値を演算す
る。 The device of the present invention detects insulation defects in various parts of a DC electrical system and calculates the value as described below.
第２図に示す如く、Ｐ側電路１にのみ絶縁不
が生じると（接地）電流I1が図の点線Ａに示す
如く流れ、その場合には図から明らかな如く、
線間電圧Ｖ、絶縁値Rep、電流検出用抵抗R3、
抵抗R2、（接地）電流I1間には、次の各式が成
立する。 As shown in FIG. 2, if insulation failure occurs only in the P-side electrical circuit 1, the (ground) current I1 flows as shown by the dotted line A in the diagram, and in that case, as is clear from the diagram,
Line voltage V, insulation value R ep , current detection resistance R 3 ,
The following equations hold true between the resistance R 2 and the (ground) current I 1 .
Ｖ＝I1（Rep＋R3＋R2） (1)
Rep＝Ｖ／I1−R3−R2 (2)
但しＮ側電路の絶縁値≫R2＋R3とする。そこ
で、Ｐ側接地電流検出回路７から出力された電
流信号I1と線間電圧検出回路９から出力された
線間電圧信号Ｖとを入力している絶縁抵抗値演
算回路１０は、前記式(2)に基き、Ｐ側電路１の
絶縁値Repを演算する。 V=I 1 (R ep + R 3 + R 2 ) (1) R ep = V/I 1 −R 3 −R 2 (2) However, the insulation value of the N-side electrical circuit≫R 2 +R 3 . Therefore, the insulation resistance value calculation circuit 10 inputting the current signal I 1 outputted from the P-side ground current detection circuit 7 and the line voltage signal V outputted from the line voltage detection circuit 9 uses the above formula ( 2), calculate the insulation value R ep of the P-side electric circuit 1.
次にＰ側とＮ側の極性が反転し、第３図に示
す如く、Ｐ側電路１に絶縁不良がある場合は、
（接地）電流I1が図の点線Ａに示す如く流れ、
その場合はは次の各式が成立する。但しＮ側電
路の絶縁値≫R1＋R3とする。 Next, the polarity of the P side and N side is reversed, and as shown in Fig. 3, if there is an insulation failure in the P side electric circuit 1,
(ground) current I1 flows as shown by dotted line A in the figure,
In that case, the following formulas hold true. However, the insulation value of the N-side circuit should be R 1 + R 3 .
Ｖ＝I1（Rep＋R3＋R1） (3)
Rep＝Ｖ／I1−R3−R1 (4)
従つて、絶縁抵抗値演算回路１０は式(4)に基き
該絶縁値Repを演算する。 V=I 1 (R ep + R 3 + R 1 ) (3) R ep = V/I 1 −R 3 −R 1 (4) Therefore, the insulation resistance value calculation circuit 10 calculates the insulation value based on equation (4). Calculate R ep .
第４図に示す如く、Ｎ側電路２にのみ絶縁不
良が生じると（接地）電流I2が点線Ｂに示す如
く流れ、その場合には、次の各式が成立する。
但しＰ側絶縁値≫R1＋R4とする。 As shown in FIG. 4, if an insulation failure occurs only in the N-side electric path 2, a (ground) current I2 flows as shown by the dotted line B, and in that case, the following equations hold true.
However, P side insulation value≫R 1 + R 4 .
Ｖ＝I2（Reo＋R4＋R1） (5)
Reo＝Ｖ／I2−R4−R1 (6)
絶縁抵抗値演算回路１０は該式(6)に基いて絶縁
値Reoを演算する。 V=I 2 (R eo + R 4 + R 1 ) (5) R eo = V/I 2 −R 4 −R 1 (6) The insulation resistance value calculation circuit 10 calculates the insulation value R eo based on the formula (6). Calculate.
次にＰ側電路１とＮ側電路２の極性が反転
し、Ｎ側電路２に絶縁不良がある第５図の如き
場合は、（接地）電流I2が図の点線Ｂにて示す
如く流れ、その場合、次の各式が成立する。但
しＰ側電路絶縁値≫R2＋R4とする。 Next, if the polarity of the P-side electric circuit 1 and the N-side electric circuit 2 is reversed and there is an insulation defect in the N-side electric circuit 2 as shown in Figure 5, the (ground) current I2 flows as shown by the dotted line B in the figure. , in that case, the following equations hold true. However, P side electric circuit insulation value≫R 2 + R 4 .
Ｖ＝I2（Reo＋R4＋R2） (7)
Reo＝Ｖ／I2−R4−R2 (8)
従つて、絶縁抵抗値演算回路１０は、式(8)に基
きＮ側電路２の絶縁値Reoを演算する。 V=I 2 (R eo + R 4 + R 2 ) (7) R eo = V/I 2 −R 4 −R 2 (8) Therefore, the insulation resistance value calculation circuit 10 is Calculate the insulation value R eo of the electric circuit 2.
第６図に示す如く、Ｐ側電路１とＮ側電路２
とに絶縁不良が生じると、Ｐ側絶縁値≫R1＋
R4、Ｎ側絶縁値≫R2＋R3の条件の下では、（接
地）電流I1及び（接地）電流I2が点線Ｃ，Ｄに
示す如く流れる。その場合には、次の各式が成
立する。 As shown in FIG. 6, P-side electric circuit 1 and N-side electric circuit 2
If an insulation failure occurs on both sides, the P side insulation value≫R 1 +
Under the conditions of R 4 , N-side insulation value≫R 2 +R 3 , (ground) current I 1 and (ground) current I 2 flow as shown by dotted lines C and D. In that case, the following equations hold true.
Ｖ＝I1（Rep＋R3＋R2） (9)
Ｖ＝I2（Reo＋R4＋R1） (10)
Rep＝Ｖ／I1−R3−R2 (11)
Reo＝Ｖ／I2−R4−R1 (12)
絶縁抵抗値演算回路１０は該式(11)、(12)に基きＰ側
電路１の絶縁値RepとＮ側電路２の絶縁値Reoを
演算する。極性が反転した場合も同様にして求め
られる。V=I 1 (R ep +R 3 +R 2 ) (9) V=I 2 (R eo +R 4 +R 1 ) (10) R ep =V/I 1 −R 3 −R 2 (11) R eo =V /I 2 −R 4 −R 1 (12) The insulation resistance value calculation circuit 10 calculates the insulation value R ep of the P-side electric circuit 1 and the insulation value R eo of the N-side electric circuit 2 based on the equations (11) and (12). calculate. It can be found in the same way even when the polarity is reversed.
第７図に示す如く、直流電動機４の電機子１
２に絶縁不良（白抜矢符Ｗに示す箇所）が起つ
た場合、例えば、コイルやライザー等に付着し
ているダストが湿り、電流が漏洩する場合、電
機子１２は回転しているので、以下に述べる如
く変動する（接地）電流が流れる。 As shown in FIG. 7, the armature 1 of the DC motor 4
If an insulation failure occurs in 2 (point indicated by the white arrow W), for example, if dust attached to the coil or riser becomes wet and current leaks, the armature 12 is rotating, so A varying (ground) current flows as described below.
(i) 第８図は、絶縁不良箇所ＷがＰ側ブラシ１
３直下にある時であつて、図示点線Ｆに示す
如く（接地）電流I1が流れる。その場合に
は、線間電圧Ｖ、絶縁値Rea等の間に次の各
式が成立する。 (i) In Figure 8, the defective insulation location W is on the P side brush 1.
3, a (ground) current I 1 flows as shown by the dotted line F in the figure. In that case, the following equations hold true between the line voltage V, the insulation value Rea, etc.
Ｖ＝I1（Rea＋R3＋R2） (13)
I1＝Ｖ／（Rea＋R3＋R2） (14)
なお、この場合は、電機子１２の抵抗及び
コイル逆起電力により、Ｎ側ブラシ１４には
（接地）電流が流れないものとしてよい。 V=I 1 (R ea + R 3 + R 2 ) (13) I 1 = V/(R ea + R 3 + R 2 ) (14) In this case, due to the resistance of the armature 12 and the coil back electromotive force, N It may be assumed that no (ground) current flows through the side brush 14.
(ii) 第９図は、絶縁不良箇所ＷがＰ側ブラシ１
３とＮ側ブラシ１４との中間位置にある時で
あつて、図の点線Ｆ，Ｇに示す如く（接地）
電流I1，I2が流れる。その場合には、線間電
圧Ｖ、絶縁値Rea等の間に次の各式が成立す
る。 (ii) In Figure 9, the defective insulation location W is on the P side brush 1.
3 and the N-side brush 14, as shown by dotted lines F and G in the figure (grounding).
Currents I 1 and I 2 flow. In that case, the following equations hold true between the line voltage V, the insulation value Rea, etc.
Ｖ＝I1（Rea＋r1＋R3＋R2） (15)
Ｖ＝I2（Rea＋r2＋R4＋R1） (16)
I1＝Ｖ／（Rea＋r1＋R3＋R2） (17)
I2＝Ｖ／（Rea＋r2＋R4＋R1） (18)
r1は電機子１２のＰ側ブラシ１３と絶縁不良
箇所Ｗ間の抵抗、r2はＮ側ブラシ１４と絶縁
不良箇所Ｗ間の抵抗である。r1，r2は電機子
１２の回転に伴い順次変化する。 V=I 1 (R ea +r 1 +R 3 +R 2 ) (15) V=I 2 (R ea +r 2 +R 4 +R 1 ) (16) I 1 =V/(R ea +r 1 +R 3 +R 2 ) ( 17) I 2 = V/(R ea + r 2 + R 4 + R 1 ) (18) r 1 is the resistance between the P side brush 13 of the armature 12 and the poor insulation point W, r 2 is the resistance between the N side brush 14 and the poor insulation point This is the resistance between points W. r 1 and r 2 change sequentially as the armature 12 rotates.
(iii) 第１０図は、絶縁不良箇所ＷがＮ側ブラシ
１４の直下にある時であつて、図の点線Ｇに
示す如く（接地）電流I2が流れる。その場合
には、線間電圧Ｖ、絶縁値Rea等の間には次
の各式が成立する。 (iii) FIG. 10 shows a case where the insulation failure point W is directly under the N-side brush 14, and a (ground) current I 2 flows as shown by the dotted line G in the figure. In that case, the following equations hold true between the line voltage V, the insulation value Rea, etc.
Ｖ＝I2（Rea＋R1＋R1） (19)
I2＝Ｖ／（Rea＋R4＋R1） (20)
従つて、電機子１２が回転数Ｎ（rpm）で回
転すると、（接地）電流I1及び（接地）電流I2
は第１１図ａ，ｂに示す如く、周波数ｆ（ｆ＝
Ｎ／60・P0／２但しP0は極数）、変動幅Ｌ（I1の場合）
、
L′（I2の場合）で変動する。前記式（14）、式
（17）、式（18）及び式（20）から容易に分るよ
うに、変動幅Ｌ，L′、線間電圧Ｖ、絶縁値Rea、
抵抗R1，R2，R3，R4間には、次の各式が成立
する。 V=I 2 (R ea +R 1 +R 1 ) (19) I 2 =V/(R ea +R 4 +R 1 ) (20) Therefore, when the armature 12 rotates at the rotation speed N (rpm), (ground ) current I 1 and (ground) current I 2
is the frequency f (f=
N/60・P 0 /2 (where P 0 is the number of poles), fluctuation width L (in case of I 1 )
, L′ (for I 2 ). As can be easily seen from the above formulas (14), (17), (18), and (20), the fluctuation widths L, L', the line voltage V, the insulation value R ea ,
The following equations hold true between the resistors R 1 , R 2 , R 3 , and R 4 .
Ｌ＝Ｖ／Rea＋R2＋R3 (21)
L′＝Ｖ／Rea＋R1＋R4 (22)
Rea＝Ｖ／Ｌ−R2−R3 (23)
Rea＝Ｖ／L′−R1−R4 (24)
変動幅検出回路１０４は、電流I2の変動幅L′を
検知し、電機子絶縁値演算回路１０３は該変動
幅検出回路１０４から出力された変動幅信号
L′と線間電圧検出回路９から出力された線間電
圧信号Ｖを入力し、前記式（24）に基いてRea
を演算する。電流I1の変動幅Ｌに基いてReaを
求めることも勿論可能である。なお、Ｐ側とＮ
側の極性が反転していても同様にしてReaは求
められる。更に、直流発電機において、その電
機子に絶縁不良が生じても同様にして電機子の
絶縁値が求められる。総合絶縁値演算回路１０
５は前記各絶縁値Rep、Reo、Reaの並列和を演
算する。表示警報器１１は前記絶縁値Rep、
Reo、Rea及びRetを表示・警告する。 L=V/R ea +R 2 +R 3 (21) L'=V/R ea +R 1 +R 4 (22) R ea =V/L-R 2 -R 3 (23) R ea =V/L'- R 1 −R 4 (24) The fluctuation width detection circuit 104 detects the fluctuation width L′ of the current I 2 , and the armature insulation value calculation circuit 103 detects the fluctuation width signal output from the fluctuation width detection circuit 104.
L' and the line voltage signal V output from the line voltage detection circuit 9 are input, and R ea is calculated based on the equation (24) above.
Calculate. Of course, it is also possible to obtain R ea based on the fluctuation range L of the current I 1 . In addition, P side and N
Even if the polarity of the sides is reversed, R ea can be found in the same way. Furthermore, in a DC generator, even if an insulation failure occurs in the armature, the insulation value of the armature can be determined in the same manner. Comprehensive insulation value calculation circuit 10
5 calculates the parallel sum of the respective insulation values R ep , R eo , and R ea . The display alarm 11 displays the insulation value R ep ,
Display/warn R eo , R ea and R et .
Ｐ側電路１又はＮ側電路２と電機子１２とに
同時に絶縁不良が生じた場合でも、前記Ｐ側又
はＮ側の接地電流検出回路７，８に、電機子１
２の回転による電流の変動を除去さす機能を付
加することにより、Ｐ側又はＮ側電路１，２の
絶縁値を演算することが出来、また変動幅検出
回路１０４に、Ｐ側電路又はＮ側電路２の絶縁
不良に基く直流の（接地）電流分を除去させ
て、電機子の絶縁値を演算することが出来る。 Even if an insulation failure occurs simultaneously in the P-side electric circuit 1 or the N-side electric circuit 2 and the armature 12, the ground current detection circuits 7 and 8 on the P-side or N-side
By adding a function to remove the current fluctuation due to the rotation of 2, it is possible to calculate the insulation value of the P-side or N-side electric circuits 1 and 2, and the fluctuation range detection circuit 104 can be used to The insulation value of the armature can be calculated by removing the direct current (ground) current due to poor insulation of the electric path 2.
以上詳説したところから明らかな如く、本発明
装置は次の如き優れた効果を奏するものである。 As is clear from the detailed explanation above, the apparatus of the present invention has the following excellent effects.
直流電気系統が活線状態にあるときにも、常
時不断に監視して、絶縁不良の発生とその発生
部位を弁別検知し、且つそれらの絶縁値を同時
に演算表示することが出来る。 Even when the DC electrical system is in a live state, it is possible to constantly monitor the system, to discriminately detect the occurrence of insulation failure and its occurrence location, and to calculate and display the insulation values at the same time.
絶縁不良とその発生部位を早期に発見するこ
とができるため、迅速的確な措置を講じること
により、漏電事故を未然に防止することが出来
るほか、通電停止中の電気系統の点検作業にも
手間が掛からなくなる。 Since insulation defects and their occurrence locations can be discovered early, by taking prompt and accurate measures, it is possible to prevent electrical leakage accidents, and it also saves time and effort when inspecting the electrical system while the power is turned off. It will no longer hang.
Ｐ側電路とＮ側電路との間の線間電圧に基い
て各部位の絶縁値を演算し、しかも各部位の絶
縁値を同時に演算表示するので、たとえ線間電
圧に変動が生じても、正確に各絶縁値を演算表
示することが出来る。 The insulation value of each part is calculated based on the line voltage between the P side electric circuit and the N side electric circuit, and the insulation value of each part is calculated and displayed at the same time, so even if there is a fluctuation in the line voltage, Each insulation value can be calculated and displayed accurately.
図面はいずれも本発明装置の実施例を説明する
ためのものであつて、第１図は本発明装置のブロ
ツク線図であつて、第２図及び第３図はＰ側電路
に絶縁不良が生じた場合の本発明装置の一部接続
図、第４図及び第５図はＮ側電路に絶縁不良が生
じた場合の本発明装置の一部接続図、第６図はＰ
側及びＮ側の電路に同時に絶縁不良が生じた場合
の本発明装置の一部接続図、第７図は直流電動機
の電機子の簡略図、第８図乃至第１０図は電機子
に絶縁不良が生じた場合の本発明装置の一部接続
図、第１１図ａは（接地）電流I1の波形図、第１
１図ｂは（接地）電流I2の波形図である。
１…Ｐ側電路、２…Ｎ側電路、３…直流電源、
４…直流電動機、５…抵抗回路、６…極性判断回
路、６１，６２…整流素子、７…Ｐ側接地電流検
出回路、７１…電圧検出回路、７２…電流演算回
路、８…Ｎ側接地電流検出回路、８１…電圧検出
回路、８２…電流演算回路、９…線間電圧検出回
路、１０…絶縁抵抗値演算回路、１１…表示警告
器、R1，R2…抵抗、Ｐ…中間接続点、Ｑ…接地
点、I1，I2…（接地）電流、R3，R4…電流検出用
抵抗。
The drawings are all for explaining the embodiments of the device of the present invention, and FIG. 1 is a block diagram of the device of the present invention, and FIGS. 4 and 5 are partial connection diagrams of the present invention device when insulation failure occurs in the N-side electric circuit, and FIG.
Figure 7 is a simplified diagram of the armature of a DC motor, and Figures 8 to 10 are diagrams showing insulation failure in the armature. FIG . 11a is a partial connection diagram of the device of the present invention when
Figure 1b is a waveform diagram of the (ground) current I2 . 1...P side electrical circuit, 2...N side electrical circuit, 3...DC power supply,
4... DC motor, 5... Resistance circuit, 6... Polarity judgment circuit, 61, 62... Rectifying element, 7... P-side grounding current detection circuit, 71... Voltage detection circuit, 72... Current calculation circuit, 8... N-side grounding current Detection circuit, 81...Voltage detection circuit, 82...Current calculation circuit, 9...Line voltage detection circuit, 10...Insulation resistance value calculation circuit, 11...Display warning device, R1 , R2 ...Resistance, P...Intermediate connection point , Q...ground point, I1 , I2 ...(ground) current, R3 , R4 ...current detection resistor.
Claims (1)
され、複数個の抵抗が直列に接続されて形成され
た抵抗回路と、該抵抗回路の中間接続点と接地点
との間に接続され、複数個の整流素子が逆並列接
続されて形成された極性判断回路と、前記夫々の
整流素子を流れる電流の値を検出する電流検出回
路と、Ｐ側電路とＮ側電路の相互間電圧を検出す
る線間電圧検出回路とを具備することを特徴とす
る絶縁抵抗値測定回路。1. A resistor circuit connected between the P-side electric circuit and the N-side electric circuit of a DC electrical system and formed by connecting a plurality of resistors in series, and the intermediate connection point of the resistor circuit and the ground point. , a polarity judgment circuit formed by connecting a plurality of rectifying elements in antiparallel, a current detection circuit for detecting the value of the current flowing through each of the rectifying elements, and a voltage between the P-side electric path and the N-side electric path. An insulation resistance value measuring circuit comprising: a line voltage detection circuit for detecting a line voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4900381A JPS57161665A (en) | 1981-03-31 | 1981-03-31 | Measuring circuit for insulation resistance value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4900381A JPS57161665A (en) | 1981-03-31 | 1981-03-31 | Measuring circuit for insulation resistance value |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57161665A JPS57161665A (en) | 1982-10-05 |
| JPH0314144B2 true JPH0314144B2 (en) | 1991-02-26 |
Family
ID=12818998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4900381A Granted JPS57161665A (en) | 1981-03-31 | 1981-03-31 | Measuring circuit for insulation resistance value |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57161665A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4540922A (en) * | 1983-03-21 | 1985-09-10 | Automeg, Inc. | Motor winding leakage monitor |
| US6127747A (en) * | 1999-09-16 | 2000-10-03 | Westinghouse Air Brake Technologies Corporation | Method and apparatus for detecting leakage current on a two wire DC or AC power line |
| JP4525630B2 (en) * | 2006-04-28 | 2010-08-18 | 富士電機システムズ株式会社 | Insulation resistance measuring method and apparatus |
| JP5003333B2 (en) * | 2007-07-30 | 2012-08-15 | 富士電機株式会社 | Insulation resistance measuring method and apparatus |
| JP5407024B2 (en) * | 2008-06-05 | 2014-02-05 | 東芝三菱電機産業システム株式会社 | Secondary battery system |
| JP5200975B2 (en) * | 2009-02-06 | 2013-06-05 | 株式会社デンソー | Current detection device for power conversion circuit |
| EP2508904B8 (en) * | 2009-12-03 | 2019-05-22 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Secondary battery system |
| CN104569597A (en) * | 2014-12-18 | 2015-04-29 | 北京新能源汽车股份有限公司 | Insulation resistance detecting method and device for power battery |
| JP6061048B1 (en) * | 2015-10-13 | 2017-01-18 | 富士電機株式会社 | Method and apparatus for measuring insulation resistance of battery power supply |
-
1981
- 1981-03-31 JP JP4900381A patent/JPS57161665A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57161665A (en) | 1982-10-05 |
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