JPS6018769A - Measurement of deterioration in insulation of power cable - Google Patents
Measurement of deterioration in insulation of power cableInfo
- Publication number
- JPS6018769A JPS6018769A JP12597383A JP12597383A JPS6018769A JP S6018769 A JPS6018769 A JP S6018769A JP 12597383 A JP12597383 A JP 12597383A JP 12597383 A JP12597383 A JP 12597383A JP S6018769 A JPS6018769 A JP S6018769A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- current
- insulator
- measured
- voltage
- 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 17
- 230000006866 deterioration Effects 0.000 title claims description 8
- 238000005259 measurement Methods 0.000 title abstract description 10
- 239000012212 insulator Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 abstract 2
- 230000000630 rising effect Effects 0.000 abstract 2
- 238000000691 measurement method Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- DOSMHBDKKKMIEF-UHFFFAOYSA-N 2-[3-(diethylamino)-6-diethylazaniumylidenexanthen-9-yl]-5-[3-[3-[4-(1-methylindol-3-yl)-2,5-dioxopyrrol-3-yl]indol-1-yl]propylsulfamoyl]benzenesulfonate Chemical compound C1=CC(=[N+](CC)CC)C=C2OC3=CC(N(CC)CC)=CC=C3C(C=3C(=CC(=CC=3)S(=O)(=O)NCCCN3C4=CC=CC=C4C(C=4C(NC(=O)C=4C=4C5=CC=CC=C5N(C)C=4)=O)=C3)S([O-])(=O)=O)=C21 DOSMHBDKKKMIEF-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
不発明は、電カケーブルの絶縁状態を判断する几めに用
いられる電カケーブルの絶縁劣化測定方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for measuring insulation deterioration of an electric power cable, which is used to judge the insulation state of the electric power cable.
（発明の技術的背景）
この椙の測定方法としては、誘電緩和現象全利用する誘
電正接測定法が知られている。(Technical Background of the Invention) As a method for measuring this temperature, a dielectric loss tangent measurement method that makes full use of the dielectric relaxation phenomenon is known.
この測定法は、被測定ケーブルに商用周波交流電圧を印
加し、標準コンデンサを組み込んだシエーリング会ブリ
ッジのφ衡をとるこによりｔａｎ ｇをめ、このｊａｎ
８からケーブルの絶縁状態を利足する方法である。This measurement method applies a commercial frequency AC voltage to the cable under test, and calculates tan g by balancing the φ of a Schering bridge incorporating a standard capacitor.
This is a method that takes advantage of the insulation condition of the cable from 8.
（背景技術の問題点）
しかし、この測定法では、破測冗ケーブルが長尺化し、
ケーブルに大きな光′ＷＬ電流を流す８賛が生じると、
商用周波交流電圧を利用するため、容量の大きな変圧器
等の電源装置、即ち大形で重量の大きな電源装置を用意
しなければならない。また、このように商用周波数電圧
を利用すると、被測定ケーブルと並行する他の同一周波
利用ケーブルからのｍ磁誘導や近接する架空線からの静
電誘導により測定回路に誘導電圧が誘起されてしまい、
従って、測定誤差が生じてしまう。(Problems with the background technology) However, with this measurement method, the cable becomes long and redundant.
When a large optical 'WL current flows through the cable,
Since commercial frequency AC voltage is used, a power supply device such as a large capacity transformer, that is, a large and heavy power supply device must be prepared. Additionally, when commercial frequency voltage is used in this way, induced voltage is induced in the measurement circuit due to magnetic induction from other cables using the same frequency running parallel to the cable under test and electrostatic induction from nearby overhead lines. ,
Therefore, measurement errors occur.
（発明の目的）
不発明の目的は、小形の電源装置を用いて、しかも他の
活線からの影４１を受けずに正確に絶縁測定全行うこと
ができる盲、カケ−プルの絶縁劣化測定方法を提供する
ことにある。(Object of the Invention) The object of the invention is to measure the insulation deterioration of blind and cable cables, which can accurately measure the insulation using a small power supply device and without being affected by the shadow 41 from other live wires. The purpose is to provide a method.
（発明の概要）
不発明は、商用周波交流電圧ではなく、直流電源により
時間的に比例して上昇する直流電圧を被測定ケーブルの
絶縁体に印７７Ｉ］ Ｌ 、この絶縁体に徐々に増加し
て流れる電流の変化量とケーブルの静電容量で決まる充
電電流とを測定し、これらの測定値から従来のｔａｎ
ｇに対応する童をめることを特徴とする。 −
（発明の実施例）
以下、本発明の実施例を図面を参照して説明する。(Summary of the Invention) The invention is based on marking the insulator of the cable to be measured with a DC voltage that increases in proportion to time, not a commercial frequency AC voltage, but a DC voltage that gradually increases on this insulator. The amount of change in the current flowing through the cable and the charging current determined by the capacitance of the cable are measured, and from these measurements, the conventional tan
It is characterized by having a child corresponding to g. - (Embodiments of the invention) Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図には不発明に係る測定方法に用いる装置の一例が
示され、測定すべき電カケーブルの絶縁体１はＣＲ’（
ｒ並列接続して成る等価回路で表わされている。FIG. 1 shows an example of an apparatus used in the measuring method according to the invention, in which the insulator 1 of the electric power cable to be measured is CR'(
It is represented by an equivalent circuit formed by connecting r in parallel.
即ち、Ｒは？！縁体１の絶縁低抗を、又Ｃはケーブル自
体の靜宵容−１ｔ’にそれぞれ示している。この絶縁体
１には直流電源２と電流測定回路３とが直列に接続され
ている。電流測定回路３はマイクロコンピュータ４と接
続され、その測定電流値が入力されるようになっている
。That is, what about R? ! C indicates the insulation resistance of the rim 1, and C indicates the resistance of the cable itself. A DC power source 2 and a current measuring circuit 3 are connected in series to this insulator 1. The current measuring circuit 3 is connected to the microcomputer 4, and the measured current value is inputted thereto.
マイクロコンピュータ４は後に述べる演算ヲ行い、かつ
制御回路として直流電源２の出力電圧を制御する。The microcomputer 4 performs calculations to be described later, and also controls the output voltage of the DC power supply 2 as a control circuit.
本発明に係る測定方法は、マイクロコンピュータ４の制
御ＮＩｒ作により直流電源２から時間に比例して上昇す
るｆｃ流電圧を出力させ、この直流電圧′（ｉ″Ｆ３縁
体１に印加する。この直流電圧は、時間ｔの関数として
、■＝αｔで表わすことができる。In the measurement method according to the present invention, an fc current voltage that increases in proportion to time is outputted from the DC power supply 2 by the control NIr operation of the microcomputer 4, and this DC voltage'(i'' is applied to the F3 edge 1. The DC voltage can be expressed as a function of time t by ■=αt.
但し、αは定数である。However, α is a constant.
このように絶縁体１に両流電圧Ｖ＝αｔを印加すると、
絶縁体１には、第２図に示すように、Ｒで決まるｉＶｉ
流ＩＲと、Ｃで決まる充電電流ＩＣとの合成電流■が流
れる。電流ＩＲと充電電流ＩＣは、次式で示す値になる
。When a dual current voltage V=αt is applied to the insulator 1 in this way,
As shown in FIG. 2, the insulator 1 has iVi determined by R.
A composite current ■ of the current IR and the charging current IC determined by C flows. The current IR and the charging current IC have values shown by the following equations.
■Ｒ−−Ｎ−−−一α
ＲＲｔ・・・・・・・・・・・・・・・・・・・・・・
・・１１Ｃ−」−（α１−Ｃ）α０曲・・四−叩…・
２ｔ
従って合成電流■は、これらが加算さ几たものとなり、
次式で示す値になる。■R--N---1α RRt・・・・・・・・・・・・・・・・・・・
・・11C-”-(α1-C)α0 song・・4-hit...・
2t Therefore, the composite current ■ is the sum of these,
The value is given by the following formula.
□α
■＝αＣ＋ ｔ・・・・・・・・・・・・・−・・・・
・・・・・・・・・・・・・・・・・３上記した充を電
流ＩＣと合成電流Ｉとは電流測定回ｆｊＰ１３にて測定
され、それぞれマイクロコンピュータ４に入力される。□α ■=αC+ t・・・・・・・・・・・・−・・・・
3 The above-mentioned charge current IC and composite current I are measured at the current measurement circuit fjP13 and inputted to the microcomputer 4, respectively.
マイクロコンピュータ４は合成電ＩＡｔ、 Ｉの入力で
、その直流電圧変化に伴う変化量を演算する。即ち、
１
（−−）＝”−・・・・・・・・・・・・・・・・・・
・・・・・・・・・４ａｔ Ｒ
乞演算する。The microcomputer 4 receives the input of the composite voltage IAt, I and calculates the amount of change due to the change in the DC voltage. That is, 1 (−−)=”−・・・・・・・・・・・・・・・・・・
・・・・・・・・・4at R Perform calculations.
そして、マイクロコンピュータ４は、この演算結果を利
用して、更にこの変化量と充電電流ＩＣとの比をめる。Then, the microcomputer 4 uses this calculation result to further calculate the ratio between this amount of change and the charging current IC.
ｘ
＜−−−−） ／ ｉ Ｃ−−−／αＣ−１・・・・・
・・・・・・・５ｄｔ ＲＣＲ
尚、充電を流ＩＣは理論的には限りなく小さい時間ｔ→
（）での電流値になるので、
Ｉｃ ＝Ｉ （ｔ＝ｏ）＝αＣ・・・・・・・・・・・
・・・・・・ ６の如く算出することができるが、実際
には安定するまで２〜３秒位かかるので、絶縁体１に電
圧を印加して２〜３秒後の電流値をＩＣとして利用する
。さて５式でめた値１／ＣＲは、従来のｔａｎＳが１／
ＣＲで表わすことができることから、このｊａｎ ３
に比例しているのが判る。x <----) / i C---/αC-1...
・・・・・・・・・5dt RCR In addition, the charging time for IC is theoretically infinitely small →
The current value is at (), so Ic = I (t=o) = αC...
It can be calculated as shown in 6, but in reality it takes about 2 to 3 seconds to stabilize, so the current value 2 to 3 seconds after applying voltage to insulator 1 is used as IC. Make use of it. Now, the value 1/CR obtained from equation 5 is that the conventional tanS is 1/CR.
Since it can be expressed as CR, this jan 3
It can be seen that it is proportional to.
従って、この値１ ／ＣＲの大小によって従来同様に絶
縁体１の絶縁の状態を判定することができる。Therefore, the insulation state of the insulator 1 can be determined based on the magnitude of this value 1/CR, as in the conventional case.
このように、不発明の測定方法では商用周波数を利用せ
ずに絶縁劣化測定を行うことができる。In this manner, the uninvented measurement method allows insulation deterioration measurement to be performed without using commercial frequencies.
ところで、最近、新しい原理に基づく電カケーブル絶縁
劣化判定装置が開発された。その原理は、直流電圧でケ
ーブルを充電、しｔ後、充電用電源を開放して、ケーブ
ルの自己放電による残留電圧の変化を調べてケーブルの
劣化を判定するものである。そして、この判定装置は、
マイクロコンピュータ制御により所定の電圧まで昇圧さ
れる直流電源を備えるので、直流電圧の昇圧過程におけ
る絶縁体１に流れる電流の変化量（４）式参照）を利用
し、かつマイクロコンピュータに前記演算プログラムを
入力するだけで、装置不米の直流もれ電流に対応する量
の測定と不発明の測定方法による測定とを実行すること
ができる。By the way, recently, an electric cable insulation deterioration determination device based on a new principle has been developed. The principle is to charge the cable with a DC voltage, then open the charging power source and check for changes in residual voltage due to self-discharge of the cable to determine whether the cable has deteriorated. And this determination device is
Since it is equipped with a DC power supply that is boosted to a predetermined voltage by microcomputer control, the amount of change in the current flowing through the insulator 1 during the boosting process of the DC voltage (see equation (4)) can be used, and the arithmetic program described above can be applied to the microcomputer. By just inputting the information, it is possible to measure the amount corresponding to the DC leakage current of the device and measure it using the inventive measuring method.
従って、ケーブルの絶縁劣化全両面からとらえることが
可能になるので、複雑な市カケーブルの絶縁状態を精度
よく判断することができる。Therefore, it is possible to assess cable insulation deterioration from all sides, making it possible to accurately judge the insulation state of complex city cables.
（発明の効果）
不発明によれば、被測足ケーブルの絶縁体に時間に比例
して上昇する直流電圧を印訓し、絶縁体へ流れる電流の
変化量とケーブルの静電容量で決まる充電電流とを測定
すると共に従来のｔａｎ Ｓに対応する狛としてこれら
測定値の比の変化を調べることで、商用周波交流電圧を
利用することなく電カケーブルの絶縁劣化の判定を行う
ことができる。従って、誘導障害の無い、非常に精度の
高い測定結３Ｉ１．に基づく絶縁状態の判断が可能とな
る。(Effect of the invention) According to the invention, a DC voltage that increases in proportion to time is applied to the insulator of the cable to be measured, and charging is determined by the amount of change in the current flowing to the insulator and the capacitance of the cable. By measuring the current and examining the change in the ratio of these measured values as a gauge corresponding to the conventional tan S, it is possible to determine the insulation deterioration of the power cable without using the commercial frequency AC voltage. Therefore, very accurate measurement result 3I1. with no induction disturbance. It becomes possible to judge the insulation state based on
また、直流電圧を印刀口することから、小形化が容易な
直流電源を用いることができ、従って、被測足ケーブル
が長尺化されても電圧装置をそれほど大形化する必をが
ないので、測定現場への運搬や移動が容易であり、又峰
済的でもある。In addition, since the DC voltage is stamped, a DC power supply that can be easily miniaturized can be used, and therefore, even if the cable to be measured becomes long, there is no need to increase the size of the voltage device. It is easy to transport and move to the measurement site, and is also convenient.
第１図は不発明に係る測定方法に用いる装置の回路構成
図、第２図はケーブル絶縁体に流れる電流変化を示す線
図である。FIG. 1 is a circuit configuration diagram of a device used in the measuring method according to the invention, and FIG. 2 is a diagram showing changes in current flowing through a cable insulator.
Claims (1)
流電圧ケ印馴し、前記絶縁体へ流れる電流の変化量及び
前記ケーブルの静電容量で決まる充電電流を測定し、前
記電流の変化量と前記充電電流との比の変化を調べるこ
とｆ、特徴とする電カケーブルの絶縁劣化測定方法。The insulator of the cable to be measured is exposed to a DC voltage that increases in proportion to time, and the charging current determined by the amount of change in the current flowing to the insulator and the capacitance of the cable is measured, and the change in the current is measured. A method for measuring insulation deterioration of an electric power cable, characterized in that the change in the ratio between the current and the charging current is examined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12597383A JPS6018769A (en) | 1983-07-11 | 1983-07-11 | Measurement of deterioration in insulation of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12597383A JPS6018769A (en) | 1983-07-11 | 1983-07-11 | Measurement of deterioration in insulation of power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6018769A true JPS6018769A (en) | 1985-01-30 |
| JPH0423224B2 JPH0423224B2 (en) | 1992-04-21 |
Family
ID=14923571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12597383A Granted JPS6018769A (en) | 1983-07-11 | 1983-07-11 | Measurement of deterioration in insulation of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6018769A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03163369A (en) * | 1989-11-22 | 1991-07-15 | Hitachi Ltd | Method and apparatus for measuring subscriber's line |
-
1983
- 1983-07-11 JP JP12597383A patent/JPS6018769A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03163369A (en) * | 1989-11-22 | 1991-07-15 | Hitachi Ltd | Method and apparatus for measuring subscriber's line |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0423224B2 (en) | 1992-04-21 |
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