JPS6154462A - Measuring method of ground insulating resistance of cable way - Google Patents
Measuring method of ground insulating resistance of cable wayInfo
- Publication number
- JPS6154462A JPS6154462A JP17725284A JP17725284A JPS6154462A JP S6154462 A JPS6154462 A JP S6154462A JP 17725284 A JP17725284 A JP 17725284A JP 17725284 A JP17725284 A JP 17725284A JP S6154462 A JPS6154462 A JP S6154462A
- Authority
- JP
- Japan
- Prior art keywords
- rectangular wave
- current
- voltage
- cable way
- insulating 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.)
- Pending
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、を路の対地絶縁抵抗を測定する方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the insulation resistance to ground of a track.
以下図面にもとづいて本発明の詳細な説明すると、(1
)は被測定電路用の三相トランス、(2)はトランス(
1)の1端子を接地した第2種接地線−、(3)に接地
線(2)に接続したトランスで、接地線(2)にく形波
の電圧を重畳させるものである。(4)はトランス(3
)に接続したく形波発生器、(5)は接地線(2)に設
置した変流器で、その出力端子間に増巾器(6)と変流
器(5)の1次電流の波形を検出するための帰還抵抗(
7)とを接続しである。(8)は帰還抵抗(刀に接続し
たフィルタで、く形波の電流のみを取シ出すものである
。(9)はく形波発生器(4)とフィルタ(8)からの
出力を演算する演算器で、く形波の電圧と電流により対
地絶縁抵抗に起因する電流のみを取り出すものでめる。The present invention will be described in detail below based on the drawings (1
) is a three-phase transformer for the circuit under test, (2) is a transformer (
A transformer is connected to the second type grounding wire (1) with one terminal grounded and (3) to the grounding wire (2), which superimposes a square wave voltage on the grounding wire (2). (4) is a transformer (3
), the current transformer (5) is connected to the ground wire (2), and the primary current of the amplifier (6) and the current transformer (5) is connected between the output terminals of the current transformer (5). Feedback resistor (
7). (8) is a feedback resistor (filter connected to the sword, which extracts only the current of the square wave. (9) Calculates the output from the square wave generator (4) and filter (8). It is a computing unit that extracts only the current caused by the ground insulation resistance using the voltage and current of the rectangular wave.
αlに演算器(9)に接続した表示器で、演算器(9)
によシ求められ九抵抗値を表示するものである◇Ra、
Rb、 Rcは被測定電路の各相の対地絶縁抵抗+
CaHCb r Ccは被測定電路の各相の対地静電容
量をめられす。A display connected to the arithmetic unit (9) at αl, the arithmetic unit (9)
◇Ra, which displays the resistance value determined by
Rb and Rc are the ground insulation resistance of each phase of the electrical circuit under test +
CaHCb r Cc measures the ground capacitance of each phase of the electrical circuit under test.
上記の回路において、く形波発生器(4)で電路の周波
数と異なるく形波の電圧を発生させ、その電圧をトラン
ス(3)により接地線(2)に重畳させる。このく形波
の電圧により接地線(2)に流れる電流は。In the above circuit, a square wave generator (4) generates a square wave voltage different from the frequency of the electrical circuit, and the transformer (3) superimposes this voltage on the ground line (2). The current flowing through the ground wire (2) due to this square wave voltage is:
電路が絶縁抵抗のみの時は、第2図のようになり、これ
に商用周波数の漏れ電流が加わる。また電路に静電容量
がるる時は、第3図のようになる。When the electrical path has only insulation resistance, it will look like the one shown in Figure 2, and a commercial frequency leakage current will be added to this. Also, when there is capacitance in the electric circuit, it becomes as shown in Fig. 3.
よってく形波の立ち下がりの近くのP点での電流の値9
点をとらえれば、絶縁抵抗分のみに起因する電流が求ま
り、く形波の電圧より電路の対地絶縁抵抗が求まる。Therefore, the current value at point P near the falling edge of the square wave is 9
If you find the point, you can find the current caused only by the insulation resistance, and from the voltage of the square wave, you can find the insulation resistance to ground of the electrical circuit.
本発明は三相トランス(1)の代わシに単相トランスを
使用することもある。In the present invention, a single-phase transformer may be used instead of the three-phase transformer (1).
本発明は、叙上のように構成したから。The present invention is constructed as described above.
(1)電気を止めないで電路の絶縁状態が測定できる0
(2)重畳させる電圧と電流の位相差を測定しないので
、インダクタンスを含んだ電路の絶縁劣化でも正しく測
定できる。(1) The insulation state of the electric circuit can be measured without stopping the electricity. (2) Since the phase difference between the superimposed voltage and current is not measured, even insulation deterioration of the electric circuit including inductance can be accurately measured.
(31E路に直流電圧を重畳するので、活線^の絶縁抵
抗計として使用できる。(Since DC voltage is superimposed on line 31E, it can be used as an insulation resistance meter for live wires.
などの利点を有する。It has the following advantages.
【図面の簡単な説明】
第1■は本発明の実施に使用する回路を示す図、第2図
は電路が絶縁抵抗のみの時、く形波の電圧によって接地
線に流れる電流の波形図、第3図は電路に静電容量がる
る時、く形波の電圧によって接地線に流れる電流の波形
図である。[BRIEF DESCRIPTION OF THE DRAWINGS] Part 1 is a diagram showing a circuit used to carry out the present invention, and Figure 2 is a waveform diagram of a current flowing through a grounding wire due to a rectangular wave voltage when the electric path has only insulation resistance. FIG. 3 is a waveform diagram of a current flowing through a grounding wire due to a rectangular wave voltage when there is capacitance in the electrical path.
Claims (1)
トランスにおいて、接地線に電路の周波数と異なるく形
波の電圧を重畳させ、その電圧により流れる電流を上記
接地線に設置した変流器により検出し、く形波のプラス
側からマイナス側に下がる瞬間の電流をとらえ、対地絶
縁抵抗分のみを求めることを特徴とする電路の対地絶縁
抵抗の測定方法。In a three-phase transformer or single-phase transformer in which one terminal of the transformer is grounded, a rectangular wave voltage different from the frequency of the electric circuit is superimposed on the ground wire, and a current flowing due to that voltage is installed in the ground wire. A method for measuring the insulation resistance to ground of an electric circuit, which is characterized by detecting the electric current at the moment when it drops from the positive side to the negative side of the rectangular wave, and determining only the insulation resistance to earth.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17725284A JPS6154462A (en) | 1984-08-24 | 1984-08-24 | Measuring method of ground insulating resistance of cable way |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17725284A JPS6154462A (en) | 1984-08-24 | 1984-08-24 | Measuring method of ground insulating resistance of cable way |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6154462A true JPS6154462A (en) | 1986-03-18 |
Family
ID=16027820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17725284A Pending JPS6154462A (en) | 1984-08-24 | 1984-08-24 | Measuring method of ground insulating resistance of cable way |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6154462A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5247777A (en) * | 1975-10-09 | 1977-04-15 | Siemens Ag | Circuit device for measuring insulation resistance in nonngrounded large current circuit |
JPS56141568A (en) * | 1980-04-04 | 1981-11-05 | Toyo Commun Equip Co Ltd | Method for measuring insulation resistance and floating capacity to ground of single-phase 3-wire type electric circuit |
-
1984
- 1984-08-24 JP JP17725284A patent/JPS6154462A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5247777A (en) * | 1975-10-09 | 1977-04-15 | Siemens Ag | Circuit device for measuring insulation resistance in nonngrounded large current circuit |
JPS56141568A (en) * | 1980-04-04 | 1981-11-05 | Toyo Commun Equip Co Ltd | Method for measuring insulation resistance and floating capacity to ground of single-phase 3-wire type electric circuit |
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