JPH0275977A - Investigating instrument for incident point of power supply line - Google Patents

Abstract

PURPOSE:To enable the exact investgation for an incident point even in plural circuit tracks by provinding two detectors capable of detecting a magnetic field of a power supply line and making non-investgating wirings adjacent to each other locate between detectors thereof. CONSTITUTION:Two detectors 1, 11 being entirely the same characteristics, connected in series and seperated at a fixed space are arranged in symmetry for top and bottom of a down-phase circuit 5b adjacent to each other at the time when the incident point of an up-phase circuit 5a is investgated. At this time, the magnetic fields of arrow marks A, B are generated in the detectors 1, 11 by a pulse current I and AC current 1b flowing into circuits 5a, 5b respectively. And, as the detectors 1, 11 have been arranged in series, an influence by the current Ib is eliminated mutually because of being arranged at equal distance, of the same magnitude and in the opposite direction. Also, an electromotive force generated by the current I becomes the sum thereof generating in the detectors 1, 11. Accordingly, when the incident point of the circuit 5a is investgated by two circuit tracks, it is possible to eliminate the influence of the current Ib of the circuit 5b and to exactly detect the current I. It is the same in the case of the plural circuit tracks.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、高電圧パルス印加法による架空配電線等の事
故点探査に使用する検出器付きの事故点探査装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fault point detection device equipped with a detector used for fault point detection in overhead power distribution lines, etc., using a high voltage pulse application method.

〔従来の技術〕[Conventional technology]

一般に、架空配電線路に接地事故等が生じた時は、高電
圧パルス印加法により事故点の探査を行なっている。こ
れは停電状態の線路区間に高電圧のパルスを印加し、接
地事故点を通って流れる線路のパルス電流を検出器付き
の事故点探査装置により検出するものである。Generally, when a grounding fault or the like occurs on an overhead power distribution line, a high voltage pulse application method is used to search for the fault point. This involves applying a high voltage pulse to a line section in a power outage state, and detecting the pulse current flowing through the line through the ground fault point using a fault point detection device equipped with a detector.

第５図は従来の事故点探査装置と該装置による事故点探
査を示す概略図である。同図において、ｌはコイル等を
用いて磁界を検出する検出器、２は上記検出器１により
検出された検出信号を接続ケーブル３を介して受信し、
信号処理した結果を図示しない表示器等で指示させる受
信装置であり、これらにより事故点探査装置４が構成さ
れている。FIG. 5 is a schematic diagram showing a conventional accident point detection device and accident point detection performed by the device. In the figure, l is a detector that detects a magnetic field using a coil or the like, 2 receives a detection signal detected by the detector 1 via a connecting cable 3,
This is a receiving device that indicates the result of signal processing on a display (not shown), etc., and constitutes an accident point searching device 4.

一方、５は配電線、６は大地、７，８はリード線、９は
高電圧パルス印加装置、１０は共同地線、Ｒｇは事故抵
抗、Ｐｉ、Ｐ２．Ｐ３．Ｐ４は電柱、Ｒｐｌ、Ｒｐ２．
Ｒｐ３．Ｒｐ４は接地抵抗、Ｉ。On the other hand, 5 is a distribution line, 6 is ground, 7 and 8 are lead wires, 9 is a high voltage pulse application device, 10 is a common ground wire, Rg is a fault resistance, Pi, P2. P3. P4 is a telephone pole, Rpl, Rp2.
Rp3. Rp4 is a grounding resistance, I.

Ｉｆ、Ｉｒ、Ｉｐ２は電流の流れを示す。If, Ir, and Ip2 indicate current flow.

次に同図を用いてこの探査方式の原理を説明する。接地
事故が生じた停電状態の線路区間の配電ＶＡ５と大地６
の間に、リード線７．８を介して高電圧パルス発生器９
により高電圧パルスを印加する。例えば電柱Ｐ２で事故
抵抗Ｒｇの事故が生じているものとすると、該パルス発
生器９からのパルス電流Ｉは事故抵抗Ｒｇを経て、電柱
ｐｉ〜Ｐ２間の共同地線１０を流れてパルス発生器９に
戻る電流Ｉｆと、その反対側の共同地線ＩＯを流れる電
流１ｒと、直ちに大地に流れ込む電流Ｉｐ２との３つに
分かれて流れる。従って、事故点探査装置４の検出器１
を配電線５と共同地線１０との間に位置させて、配電線
５と共同地線１０に流れる電流によって生じる磁界の合
成磁界を該パルス発生器９側から線路に沿い確認してい
けば、事故点を通り過ぎると配電線５にはパルス電流ｌ
は流れず、共同地線１０に流れる電流１ｒにより発生す
る磁界のみに・なるので、事故点が発見できる。なお、
配電綿５と検出器ｌとの距離は、三相−括に検出し、な
おかついずれの相で接地事故を起こしていても確実に検
出できることが必要で、実験的に６０ｃｆｆｉ程度とす
るのが最適距離という効果が得られている。Next, the principle of this exploration method will be explained using the same figure. Power distribution VA5 and ground 6 of the line section under power outage where the grounding accident occurred
During this time, the high voltage pulse generator 9 is connected via the lead 7.8.
A high voltage pulse is applied. For example, if a fault with fault resistance Rg has occurred at utility pole P2, the pulse current I from the pulse generator 9 passes through fault resistance Rg, flows through the common ground wire 10 between utility poles pi and P2, and flows to the pulse generator. The current If returns to the ground, the current 1r flows through the common ground wire IO on the opposite side, and the current Ip2 immediately flows into the ground. Therefore, the detector 1 of the accident point detection device 4
is located between the distribution line 5 and the common ground wire 10, and the composite magnetic field of the magnetic field generated by the current flowing through the distribution line 5 and the common ground wire 10 is confirmed along the line from the pulse generator 9 side. , after passing the fault point, a pulse current l flows through the distribution line 5.
does not flow, and only the magnetic field is generated by the current 1r flowing through the common ground wire 10, so the fault point can be found. In addition,
The distance between the distribution cotton 5 and the detector l needs to be able to detect the three phases collectively, and it is necessary to be able to reliably detect even if a grounding accident occurs in any phase, and experimentally it is optimal to set it to about 60 cffi. The effect of distance is obtained.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかしながら、上記従来の事故探査装置によると複数回
線線路の上相の事故探査が非常に困難であった。However, according to the conventional fault detection device described above, fault detection in the upper phase of a multi-circuit line is extremely difficult.

以下、第６図に示す二回線線路において説明する０図に
おいて、検出器１は事故点探査を行なう上相回線５ａか
ら通常の配電線の探査時と同じたけ離れた位置に置かれ
ている。つまり第１図の配電線５と検出器１の間の距離
と、第２図の二回線線路の下相回線５ａと検出器ｌの間
の距離は同じである。上相回線５ａと下相回線５ｂの距
離は一般的に９０ｃ１１程度であるため、検出器ｌは二
回線線路の下相回線５ｂに近い位置に置かれることにな
る。この下相口Ｗ５ｂは、はとんどの場合健全相で交流
の高電圧が印加されているので、検出器ｌはそこに流れ
る交流電流１ｂによって生じる磁界の影響を受けて上相
口ｖＡ５ａに流れるパルス電流Ｉを検出することが困難
となり、事故点の方向をほとんど判別できないという問
題点があった。6, the detector 1 is placed as far away from the upper phase line 5a where the fault point is being searched as it is when searching for a normal distribution line. That is, the distance between the power distribution line 5 and the detector 1 in FIG. 1 is the same as the distance between the lower phase line 5a of the two-line line and the detector l in FIG. 2. Since the distance between the upper phase line 5a and the lower phase line 5b is generally about 90c11, the detector 1 is placed at a position close to the lower phase line 5b of the two-circuit line. Since this lower phase opening W5b is in a healthy phase in most cases and a high alternating voltage is applied, the detector l is influenced by the magnetic field generated by the alternating current 1b flowing there, and the current flows to the upper phase opening vA5a. There was a problem in that it became difficult to detect the pulse current I, and the direction of the fault point could hardly be determined.

本発明は係る問題点を解決するためになされたもので、
複数回ｖＡ線路においても、確実に事故点探査を行なえ
る配電線の事故点探査装置を提供することを目的とする
ものである。The present invention was made to solve such problems,
It is an object of the present invention to provide a fault point detection device for a power distribution line that can reliably perform fault point detection even in a multi-current vA line.

〔課題を解決するた・めの手段〕[Means to solve the problem]

本発明に係る配電線の事故点探査装置は、パルス電流に
より配電線に生じる磁界を検出する第１検出器より一定
距離離間した第２検出器を設けたものである。A fault point detection device for a power distribution line according to the present invention is provided with a second detector spaced a certain distance from a first detector that detects a magnetic field generated in a power distribution line by a pulsed current.

〔作用〕[Effect]

本発明においては、第１．第２両検出器間に事故点探査
を行なう配電線に隣接する非探査配電線を位置させるこ
とにより、第１検出器で検出された非探査配電線に流れ
る電流の検出信号は第２検出器で検出された非探査配電
線の検出信号で相殺され、事故点探査を行なう配電線に
流れるパルス電流だけが検出される。In the present invention, first. By locating a non-exploration distribution line adjacent to the distribution line for fault point investigation between the second detectors, the detection signal of the current flowing through the non-exploration distribution line detected by the first detector can be transmitted to the second detector. This is canceled out by the detection signal of the non-exploration distribution line detected in , and only the pulse current flowing through the distribution line where the fault point is being investigated is detected.

〔実施例〕〔Example〕

、以下、本発明を第１図ないし第４図に示す実施例゛に
もとづき説明する。第１図は本実施例による事故点探査
装置と該装置による二回線線路の事故点探査を示す概略
図であり、第５図及び第６図に示す従来例と同−又は相
当部分には同一符号を付してその説明は省略する。図に
おいて、１１は検出器１と同様な検出器であり、本実施
例においては上記検出器１が第１検出器を、検出器１１
が第２検出器をそれぞれ構成し、一定距離離間して設け
られている。第２図に検出器１，１１にコイルを使用し
た場合の詳細を示す。検出器ｉ、ｔｉは全く同じ特性の
もので、直列に接続され、下相回線５ａの事故点探査時
には隣接する下相回線５ｂに上下対称に配置される。The present invention will be explained below based on the embodiments shown in FIGS. 1 to 4. FIG. 1 is a schematic diagram showing the fault point detection device according to the present embodiment and the fault point detection of a dual circuit line by the device, and the same or equivalent parts are the same as the conventional example shown in FIGS. 5 and 6. Reference numerals are given and explanations thereof are omitted. In the figure, 11 is a detector similar to detector 1, and in this embodiment, the detector 1 is the first detector, and the detector 11 is the first detector.
constitute the second detectors, and are spaced apart from each other by a certain distance. FIG. 2 shows details when coils are used in the detectors 1 and 11. Detectors i and ti have exactly the same characteristics, are connected in series, and are vertically symmetrically arranged on the adjacent lower phase line 5b when searching for a fault point in the lower phase line 5a.

次に以上のように構成された本実施例の作用について第
３図及び第４図を用いて説明する。Next, the operation of this embodiment configured as described above will be explained using FIGS. 3 and 4.

第３図は下相回線５ｂに流れる交流電流［ｂにより発生
ずる磁界による作用を示し、第４図は上相同線５ａに流
れるパルス電流Ｉにより発生する磁界による作用を示し
ている。なお、Ｖａは検出信号として検出器ｌに発生す
る起電力、ｖｂは同じく検出信号として検出器１１に発
生する起電力である。3 shows the effect of the magnetic field generated by the alternating current [b flowing in the lower phase line 5b, and FIG. 4 shows the effect of the magnetic field generated by the pulsed current I flowing in the upper phase line 5a. Note that Va is an electromotive force generated in the detector 1 as a detection signal, and vb is an electromotive force generated in the detector 11 as a detection signal.

第３図において、下相回線５ｂに流れる交流電流１ｂに
より矢印Ａの向きに磁界が発生したとすると、２つの検
出器１．１１は下相回線５ｂから同じ距離だけ離れてい
るので、発生する起電力ｖａ（！：ｖｂは同じ大きさで
ある。しかし、２つの検出器１．１１は直列に接続され
ているので、起電力の発生する向きが反対になって、全
体としての出力は、Ｖａ＋Ｖｂ＝０　　（Ｖ）となり、
交流電流１ｂによる影響は相殺される。In Fig. 3, if a magnetic field is generated in the direction of arrow A by the alternating current 1b flowing through the lower phase line 5b, the two detectors 1.11 are the same distance away from the lower phase line 5b, so the magnetic field is generated. The electromotive force va(!:vb is the same magnitude. However, since the two detectors 1.11 are connected in series, the direction in which the electromotive force is generated is opposite, and the overall output is Va+Vb=0 (V),
The influence of the alternating current 1b is canceled out.

一方、第４図において、上相回線５ａに流れるパルス電
流■により矢印Ｂの向きに磁界が発生したとすると、検
出器１．１１に発生する起電力Ｖａとｖｂが同じ向きに
なるので全体としての出力は、ｌＶａ＋Ｖｂｌ＞０　　
　（Ｖ）となる。On the other hand, in Fig. 4, if a magnetic field is generated in the direction of arrow B due to the pulse current flowing through the upper phase line 5a, the electromotive force Va and vb generated in the detector 1.11 will be in the same direction, so the overall The output of lVa+Vbl>0
(V).

従って、本実施例によれば、二回線線路における上相同
線５ａの事故点探査をする時に、下相回線５ｂに流れる
交流電流１ｂによる影響をなくすくとができるので、上
相回線５ａに流れるパルス電流Ｉを確実に検出すること
ができる。Therefore, according to this embodiment, when searching for a fault point in the upper phase line 5a in a two-line line, it is possible to eliminate the influence of the alternating current 1b flowing in the lower phase line 5b. Pulse current I can be detected reliably.

なお、上記実施例においては二回線線路での事故点探査
について示したが、複数回線線路においても同様となる
。In addition, although the above-mentioned embodiment shows fault point detection on a two-circuit line, the same applies to a multi-line line.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明によれば、パルス電流により
配電線に生じる磁界を検出する第１検出器より一定距離
離間した第２検出器を設け、両検出器間に上記配電線と
隣接する非探査配電線を位置させて、第１検出器で検出
した非探査配電線に流れる電流の検出信号を第２検出器
で検出した非探査配？ｉｌｔ線の検出・信号で相殺可能
としたので、複数回線線路においても、確実に事故点探
査を行なえる配電線の事故点探査装置を提供することが
できるという効果がある。As explained above, according to the present invention, a second detector is provided which is spaced a certain distance from a first detector that detects a magnetic field generated in a power distribution line by a pulse current, and a non-magnetic field adjacent to the power distribution line is provided between the two detectors. The detection signal of the current flowing in the non-exploration distribution line detected by the first detector is detected by the second detector when the exploration distribution line is located. Since it is possible to cancel the detection and signal of the ILT line, there is an effect that it is possible to provide a distribution line fault point detection device that can reliably perform fault point detection even in a multi-line line.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明による事故点探査装置の一実施例とこの
実施例による二回線線路の事故点探査を示す概略図、第
２図は上記実施例の詳細図、第３図及び第４図は上記実
施例の作用説明図、第５図及び第６図は従来例を示す概
略図である。 ｌ・・・第１検出器、４・・・事故点探査装置、５ａ・
・・配電線、５ｂ・・・非探査配電線、１１・・・第２
検出器、■・・・パルス電流、Ｖａ、Ｖｂ・・・検出信
号。 なお、図中向−又は相当部分には同一符号を用いている
。 代理人　　大　　岩　　増　　雄（ほか２名）第２図　
　　　第３図　　第４図 ｖａ、ｖｂ：ｇｔｎ 手続補正書（自発）FIG. 1 is a schematic diagram showing an embodiment of the fault point detection device according to the present invention and fault point detection on a dual circuit line according to this embodiment, FIG. 2 is a detailed diagram of the above embodiment, and FIGS. 3 and 4. is an explanatory diagram of the operation of the above embodiment, and FIGS. 5 and 6 are schematic diagrams showing a conventional example. l...First detector, 4...Fault point search device, 5a.
... Distribution line, 5b... Non-exploration distribution line, 11... Second
Detector, ■...Pulse current, Va, Vb...Detection signal. It should be noted that the same reference numerals are used for or corresponding parts in the drawings. Agent Masuo Oiwa (and 2 others) Figure 2
Figure 3 Figure 4 VA, VB: gtn Procedural amendment (voluntary)

Claims (1)

【特許請求の範囲】[Claims] 複数回線線路の任意の配電線に供給されたパルス電流に
より上記配電線に生じる磁界を第１検出器で検出するこ
とにより事故点を探査する配電線の事故点探査装置であ
って、上記第１検出器より一定距離離間した第２検出器
を設け、両検出器間に上記配電線と隣接する非探査配電
線を位置させて、第１検出器で検出した非探査配電線に
流れる電流の検出信号を第２検出器で検出した非探査配
電線の検出信号で相殺可能としたことを特徴とする配電
線の事故点探査装置。A distribution line fault point detection device for detecting a fault point by detecting a magnetic field generated in the distribution line by a pulse current supplied to an arbitrary distribution line of a plurality of circuit lines with a first detector, the first detector A second detector is provided a certain distance away from the detector, and a non-exploration distribution line adjacent to the above-mentioned distribution line is located between both detectors, and the current flowing in the non-exploration distribution line detected by the first detector is detected. 1. A distribution line failure point detection device, characterized in that the signal can be offset by a detection signal of a non-explored distribution line detected by a second detector.