JP3000475B2 - Loop resistance measurement method for loop resistance type distribution line fault point disconnection system - Google Patents
Loop resistance measurement method for loop resistance type distribution line fault point disconnection systemInfo
- Publication number
- JP3000475B2 JP3000475B2 JP2225411A JP22541190A JP3000475B2 JP 3000475 B2 JP3000475 B2 JP 3000475B2 JP 2225411 A JP2225411 A JP 2225411A JP 22541190 A JP22541190 A JP 22541190A JP 3000475 B2 JP3000475 B2 JP 3000475B2
- Authority
- JP
- Japan
- Prior art keywords
- loop resistance
- ground fault
- fault point
- distribution line
- 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.)
- Expired - Lifetime
Links
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- Measurement Of Resistance Or Impedance (AREA)
- Locating Faults (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、配電線路の電柱の地絡事故の検出に用いる
ループ抵抗方式配電線事故点標定切離しシステムにおけ
る子局と地絡センサ間のループ抵抗測定方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a loop between a slave station and a ground fault sensor in a loop resistance type distribution line fault point locating and separating system used for detecting a power pole ground fault in a distribution line. It relates to a method for measuring resistance.
（従来の技術） 第３図は、従来の配電線事故点切離しシステムにおけ
るループ抵抗測定方法の等価回路を示し、第４図は第３
図の従来例の線路抵抗対測定電圧の特性を示している。
第３図において、30は地絡点検出の子局であり、地絡セ
ンサに電源を供給する直流電源31を有する。40は地絡セ
ンサであって、地絡を検出すると閉じられる接点k43を
有している。(Prior Art) FIG. 3 shows an equivalent circuit of a loop resistance measuring method in a conventional distribution line fault point separation system, and FIG.
FIG. 4 shows the characteristics of the line resistance versus the measured voltage in the conventional example of FIG.
In FIG. 3, reference numeral 30 denotes a slave station for detecting a ground fault point, and has a DC power source 31 for supplying power to the ground fault sensor. Reference numeral 40 denotes a ground fault sensor, which has a contact k43 that is closed when a ground fault is detected.
次に上記従来例の動作について説明する。第３図にお
いて、地絡センサ40が地絡を検出すると接点k43を閉じ
る。子局30の直流電源31からループ電流ISが流れ、子局
30の抵抗ｒはISに比例した電圧下降が生じるのでこれを
測定し、電圧降下の値により値絡点の検出を行う。Next, the operation of the above conventional example will be described. In FIG. 3, when the ground fault sensor 40 detects a ground fault, the contact k43 is closed. Loop current I S flows from the DC power supply 31 of the slave station 30, the slave station
Resistance r of 30 measures this because voltage drop proportional to I S is generated, the detection value絡点by the value of the voltage drop.
（発明が解決しようとする課題） しかしながら、上記従来の測定方法による特性は第４
図に示すとおりで、測定する抵抗が大きくなるほど抵抗
の変化の割合に対して測定値の変化が少なくなり、測定
分解能が低下する。そのため遠端の地絡センサについて
は標定の誤差が生じやすい。また、この時第３図に示す
近端の地絡センサ40−１の地絡検出回路41には消費電流
ILが流れるため、さらに誤差の要因となる問題があっ
た。(Problems to be Solved by the Invention) However, the characteristics according to the above-mentioned conventional measuring method are the fourth.
As shown in the figure, as the resistance to be measured increases, the change in the measured value decreases with respect to the rate of change in the resistance, and the measurement resolution decreases. Therefore, an error in orientation is likely to occur for the ground fault sensor at the far end. At this time, the current consumption is supplied to the ground fault detection circuit 41 of the near-end ground fault sensor 40-1 shown in FIG.
Since I L flows, there is a problem that further causes the error.
本発明は、このような従来の問題を解決するため、測
定分解能の向上と測定誤差の小さいループ抵抗測定方法
を提供することを目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for measuring loop resistance with improved measurement resolution and small measurement errors in order to solve such conventional problems.
（課題を解決するための手段） 本発明は、上記の目的を達成するために、ループ抵抗
測定時に子局の定電流源を使用して連絡線に流し、連絡
線の電圧降下を測定するとともに、電源側（子局に近い
側）の他の地絡センサに流れる電流を無視できる値とな
るようにしたものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method of measuring a loop resistance by flowing a current through a communication line using a constant current source of a slave station and measuring a voltage drop of the communication line. The current flowing to the other ground fault sensor on the power supply side (closer to the slave station) has a value that can be ignored.
（作 用） したがって本発明によれば、定電流源を使用すること
により、線路抵抗に比例した電圧降下の値が得られ、ま
た、電源側に近い地絡検出回路に流れる電流は無視する
ことができるため、末端付近の地絡センサが地絡を検出
した場合の標定精度が向上するため地絡柱の発見をより
迅速に行うことができる。(Operation) Therefore, according to the present invention, by using the constant current source, a voltage drop value proportional to the line resistance can be obtained, and the current flowing in the ground fault detection circuit near the power supply side can be ignored. Therefore, when a ground fault sensor near the end detects a ground fault, the positioning accuracy is improved, so that a ground fault pillar can be found more quickly.
（実施例） 第１図は本発明の実施例についてのループ抵抗測定方
法の等価回路を示すものである。第１図において10は地
絡検出用子局、11は直流電源、12は定電流源、13は測定
切換スイッチ、20は地絡センサ、21は地絡検出回路、22
は定電圧ダイオード、23は連絡線を短絡する接点ｋであ
る。FIG. 1 shows an equivalent circuit of a loop resistance measuring method according to an embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a ground fault detecting slave station, 11 denotes a DC power supply, 12 denotes a constant current source, 13 denotes a measurement changeover switch, 20 denotes a ground fault sensor, 21 denotes a ground fault detection circuit, 22
Is a constant voltage diode, and 23 is a contact k for short-circuiting the connection line.
次に上記実施例の動作について説明する。上記実施例
において、地絡センサ20−ｎが地絡を検出すると地絡検
出回路21により、接点k23が閉じる。Next, the operation of the above embodiment will be described. In the above embodiment, when the ground fault sensor 20-n detects the ground fault, the ground fault detection circuit 21 closes the contact k23.
子局10は直流電源11からセンサに流れる電流Isによっ
て抵抗ｒに生じる電圧の値からセンサ動作を検出し、所
定の動作を行う。その後測定切換スイッチ13を定電流源
12に切換える。この時、電圧測定もセンサ連絡線側に切
換わる。センサ連絡線に流れる電流は子局10から供給す
る定電流ｉとなる。その結果測定したセンサ連絡線の電
圧は、第２図に示した線路抵抗Ｒに比例した値となる。Slave station 10 detects the sensor operation from the value of the voltage generated in the resistor r by the current I s flowing from the DC power source 11 to the sensor, performs a predetermined operation. Then switch the measurement switch 13 to the constant current source
Switch to 12. At this time, the voltage measurement is also switched to the sensor connection line side. The current flowing through the sensor connection line is a constant current i supplied from the slave station 10. As a result, the measured voltage of the sensor connection line has a value proportional to the line resistance R shown in FIG.
子局10からの定電流ｉと線路抵抗の最大値Ｒ（max）
と地絡センサ20の定電圧ダイオード22のしきい電圧VZの
関係は、VZ＞iR（max）となるように設計されているた
め、ループ抵抗測定時に地絡センサ20の地絡検出回路21
への電流ILは、定電圧ダイオードの漏れ電流のみとな
る。Constant current i from slave station 10 and maximum value R (max) of line resistance
A relationship between the threshold voltage V Z of the constant voltage diode 22 of the ground fault sensor 20, V Z> because it is designed to be iR (max), the ground fault detection circuit of the ground fault sensor 20 when the loop resistance measurement twenty one
Current IL is only the leakage current of the constant voltage diode.
（発明の効果） 本発明は、上記実施例から明らかなように、ループ抵
抗測定に定電流源の使用と電源側に近い地絡検出回路に
流れる電流を無視することができるため、地絡柱の標定
精度の向上が図られ、地絡柱の発見をより迅速に行うこ
とができる効果を有する。(Effects of the Invention) As is clear from the above embodiment, the present invention can use a constant current source for loop resistance measurement and can ignore the current flowing in the ground fault detection circuit near the power supply side. Has the effect of improving the positioning accuracy of the ground fault and finding the ground fault pillar more quickly.
第１図は本発明の一実施例におけるループ抵抗測定方法
の等価回路、第２図は第１図における線路抵抗対測定電
圧の特性図、第３図は従来例におけるループ抵抗測定方
法の等価回路、第４図は第３図における線路抵抗対測定
電圧の特性図である。 10,30……子局、11,31……直流電源、12……定電流源、
13……測定切換スイッチ、20,40……地絡センサ、21,41
……地絡検出回路、22……定電圧ダイオード、23……連
絡線を短絡する接点ｋ。FIG. 1 is an equivalent circuit of a loop resistance measuring method according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of line resistance vs. measured voltage in FIG. 1, and FIG. 3 is an equivalent circuit of a conventional loop resistance measuring method. FIG. 4 is a characteristic diagram of the line resistance versus the measured voltage in FIG. 10,30 ... slave station, 11,31 ... DC power supply, 12 ... constant current source,
13 Measurement switch, 20, 40 Ground fault sensor, 21, 41
… Ground fault detection circuit, 22… Constant voltage diode, 23… Contact k that short-circuits the connection line.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−153257（ＪＰ，Ａ) 特開 平１−269325（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01R 27/00 G01R 31/08 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-153257 (JP, A) JP-A-1-269325 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G01R 27/00 G01R 31/08
Claims (1)
とシステムの子局とを接続する連絡線が、地絡した前記
電柱の前記地絡センサによって短絡されたときに、前記
連絡線のループ抵抗における電圧降下値を測定して、地
絡点を検出するループ抵抗測定方法において、 前記地絡センサにはそれぞれしきい値電圧が（定電流×
線路抵抗の最大値）を超える定電圧ダイオードが直列に
接続され、前記子局には地絡センサ用の直流電源とルー
プ抵抗測定用の定電流源とが備えられており、前記連絡
線が前記直流電源に接続されているときに、前記ループ
抵抗の電圧降下を検出すると、前記連絡線の接続を前記
定電流源に切り換えて、前記ループ抵抗における電圧降
下値を測定し、地絡点を検出することを特徴とするルー
プ抵抗方式配電線事故点切離しシステムにおけるループ
抵抗測定方法。When a connection line connecting a ground fault sensor installed on each pole of a distribution line to a slave station of a system is short-circuited by the ground fault sensor of the pole, the connection line is connected. In the loop resistance measuring method for measuring a voltage drop value at a loop resistance of the ground fault and detecting a ground fault point, the ground fault sensors each have a threshold voltage of (constant current ×
A constant voltage diode exceeding the maximum value of the line resistance) is connected in series, and the slave station is provided with a DC power supply for a ground fault sensor and a constant current source for measuring a loop resistance. When a voltage drop of the loop resistance is detected while being connected to a DC power supply, the connection of the connection line is switched to the constant current source, a voltage drop value at the loop resistance is measured, and a ground fault point is detected. A loop resistance measuring method in a loop resistance type distribution line fault point disconnection system, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2225411A JP3000475B2 (en) | 1990-08-29 | 1990-08-29 | Loop resistance measurement method for loop resistance type distribution line fault point disconnection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2225411A JP3000475B2 (en) | 1990-08-29 | 1990-08-29 | Loop resistance measurement method for loop resistance type distribution line fault point disconnection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04109175A JPH04109175A (en) | 1992-04-10 |
| JP3000475B2 true JP3000475B2 (en) | 2000-01-17 |
Family
ID=16828953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2225411A Expired - Lifetime JP3000475B2 (en) | 1990-08-29 | 1990-08-29 | Loop resistance measurement method for loop resistance type distribution line fault point disconnection system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3000475B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5499023A (en) * | 1992-05-27 | 1996-03-12 | Kaye Instruments, Inc. | Method of and apparatus for automated sensor diagnosis through quantitative measurement of one of sensor-to-earth conductance or loop resistance |
| CN111948459A (en) * | 2020-06-16 | 2020-11-17 | 国网浙江义乌市供电有限公司 | Alternating current loop resistance test system in low-voltage distribution network |
-
1990
- 1990-08-29 JP JP2225411A patent/JP3000475B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04109175A (en) | 1992-04-10 |
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