JPH0894699A - Apparatus for searching for accident point of power distribution line - Google Patents
Apparatus for searching for accident point of power distribution lineInfo
- Publication number
- JPH0894699A JPH0894699A JP6233900A JP23390094A JPH0894699A JP H0894699 A JPH0894699 A JP H0894699A JP 6233900 A JP6233900 A JP 6233900A JP 23390094 A JP23390094 A JP 23390094A JP H0894699 A JPH0894699 A JP H0894699A
- Authority
- JP
- Japan
- Prior art keywords
- accident point
- cable
- power distribution
- magnetic field
- high frequency
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Locating Faults (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、屋内配電線路や地中配
電線路での天井，壁，床，地中などに隠蔽されている配
電ケーブルの地絡，漏電事故の事故点を発見するため
の、配電線路事故点探索装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for discovering ground faults of power distribution cables hidden in ceilings, walls, floors, undergrounds, etc. of indoor power distribution lines and underground power distribution lines, and accident points of leakage accidents. The present invention relates to a distribution line accident point search device.
【０００２】[0002]
【従来の技術】配電ケーブルの短絡，断線，損傷による
事故点発見には、絶縁抵抗測定器（メガー）による発電
電流を通過，帰還させて、対地間絶縁強度で判定する絶
縁抵抗測定方法が普及している。2. Description of the Related Art In order to find an accident point due to a short circuit, disconnection, or damage of a distribution cable, an insulation resistance measuring method is widely used, in which a generated current by an insulation resistance measuring instrument (Megger) is passed through and returned to judge by the insulation strength between the ground. are doing.
【０００３】絶縁抵抗測定方法は、例えば、図２に示す
ように、隠蔽された配電ケーブル１の始端Ａにメガー２
０の発電機２１の一端を接し、配電ケーブル１の複数あ
る終端Ｃ，Ｄを順次に接地ＥC又はＥDしながら、メガー
の発電機２１から電流を流すと、配線ケーブル正常時は
終端Ｃ又はＤ側接地点ＥC又はＥDとメガー２０の接地点
ＥOとの間に電流帰還ループが構成され、メガーの指示
計２２の絶縁抵抗指示値は零付近となり、正常を確認す
ることができる。一方、メガー２０の絶縁抵抗指示値が
予想値より大きい場合は、その電流帰還ループのどこか
に断線等の異常があることがわかる。例えば、配電ケー
ブル１の終端Ｄを接地ＥDしてメガーの絶縁抵抗指示値
が大きい場合は、配電ケーブル１の分岐点Ｂと終端Ｄと
の間にケーブルの断線事故点Ｆがあることがわかる。The insulation resistance measuring method is, for example, as shown in FIG. 2, a megger 2 at the beginning A of the concealed power distribution cable 1.
When one end of the generator 21 of 0 is contacted and a plurality of terminations C and D of the distribution cable 1 are sequentially grounded E C or E D while a current is supplied from the generator 21 of the megger, the termination C is normally applied when the wiring cable is normal. Alternatively, a current feedback loop is formed between the D-side ground point E C or E D and the ground point E O of the megger 20, and the insulation resistance reading of the megger indicator 22 is close to zero, and it is possible to confirm normality. it can. On the other hand, when the insulation resistance indication value of the megger 20 is larger than the expected value, it can be seen that there is an abnormality such as disconnection somewhere in the current feedback loop. For example, when the terminal D of the power distribution cable 1 is grounded E D and the insulation resistance indication value of the megger is large, it can be seen that there is a cable disconnection accident point F between the branch point B and the terminal D of the power distribution cable 1. .
【０００４】[0004]
【発明が解決しようとする課題】配電ケーブルの短絡，
断線，損傷による事故点の発見方法は、メガーで対地間
絶縁強度を判定する絶縁抵抗測定方法が主流である。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The main method of finding the accident point due to disconnection or damage is to use a megger to measure the insulation resistance with respect to ground.
【０００５】多分岐又は複雑な構成をしている配電ケー
ブルの事故点を発見するためには、配電線路を閉じた
（通常供給電源を停止、かつ区間を限定した）状態で、
配電ケーブル異常を拡大しない程度の低電圧源を模擬的
に注入する必要がある。In order to find an accident point of a power distribution cable having a multi-branch or a complicated structure, the power distribution line is closed (normally the power supply is stopped and the section is limited).
It is necessary to inject a low voltage source that does not expand the abnormality of the distribution cable.
【０００６】配電ケーブルは交流配電回路が大部分であ
るので、絶縁抵抗測定方法は交流低電源を注入するとい
う必然性がある。また、異常の程度を絶縁抵抗値にてあ
る精度で定量化できるという測定上の利点がある。しか
し、迅速な事故点発見の観点からすると、次のような問
題がある。Since most of the distribution cable has an AC distribution circuit, the insulation resistance measuring method has a necessity of injecting an AC low power source. In addition, there is an advantage in measurement that the degree of abnormality can be quantified by the insulation resistance value with certain accuracy. However, from the viewpoint of prompt detection of accident points, there are the following problems.
【０００７】（１）配電ケーブルの終端を順次接地しな
ければならない。更に、このとき図３に示すように、配
電ケーブル１に接続された負荷機器類３に保安用接地機
器３Bや低耐圧機器３Aがある場合は、原理及び破損防止
上電気的接続を取り外して測定し、復旧させる必要があ
る。(1) The ends of the power distribution cable must be sequentially grounded. Further, at this time, as shown in FIG. 3, if the load devices 3 connected to the power distribution cable 1 include the safety grounding device 3 B and the low withstand voltage device 3 A , the electrical connection is removed for the principle and damage prevention. Need to be measured and restored.
【０００８】（２）配電ケーブルに異常が有るらしいと
の絶縁抵抗指示値が示された場合に、配電線路の固有イ
ンピーダンスと比較して判定できる能力を必要とする。(2) When an insulation resistance indication value indicating that there is an abnormality in the power distribution cable is displayed, it is necessary to have the ability to judge by comparing with the specific impedance of the power distribution line.
【０００９】（３）配電ケーブルのどの位置に異常が有
るか特定できないために、天井，壁，床，地中などに隠
蔽されている配電ケーブル全体を確認する労力を必要と
する。(3) Since it is not possible to specify in which position of the power distribution cable the abnormality is present, it is necessary to make an effort to check the entire power distribution cable hidden in the ceiling, walls, floor, underground and the like.
【００１０】このように絶縁抵抗測定方法は、経験に頼
ることが多く、事故点発見までに長時間費やすという欠
点がある。As described above, the insulation resistance measuring method has a drawback in that it often takes a long time to find an accident point, depending on experience.
【００１１】本発明は、従来のこのような問題点を解決
すべくなされたものであり、その目的とするところは、
露出又は隠蔽された配電ケーブルの地絡，漏電及び断線
等の事故点を容易に探索しうる配電線路事故点探索装置
を提供することにある。The present invention has been made to solve the above-mentioned conventional problems, and its object is to:
An object of the present invention is to provide a distribution line fault point search device capable of easily searching for a fault point such as a ground fault, an electric leakage and a disconnection of an exposed or concealed power distribution cable.
【００１２】[0012]
【課題を解決するための手段】上記目的を達成するため
に、本発明における配電線路事故探索装置は、配電線路
に高周波信号を注入する高周波発生器と、この高周波信
号により配電線路に発生する微弱磁界を配電線路に近づ
け移動させて検出する界磁検出コイルと、この界磁検出
コイルの検出電圧の消えるのを検出して事故点と判定す
る事故点判定器とからなることを特徴とする。In order to achieve the above object, a distribution line fault searching apparatus according to the present invention includes a high frequency generator for injecting a high frequency signal into the distribution line and a weak voltage generated in the distribution line by the high frequency signal. It is characterized by comprising a field detection coil for detecting a magnetic field by moving the magnetic field closer to a distribution line and an accident point determiner for detecting the disappearance of the detection voltage of the field detection coil and determining the accident point.
【００１３】[0013]
【作用】配電線路に高周波を注入すると、地絡，漏電，
断線等の事故点までの健全な配電線路に微弱磁界が発生
する。界磁検出コイルを配電線路に近づけると微弱磁界
の発生している健全な配電線路位置では界磁検出コイル
に検出（誘起）電圧が発生するが、事故点位置では微弱
磁界が発生しないか極めて弱くなり、検出電圧が消え
る。事故点判定器はこの検出電圧の消えるのを検出して
事故点判定をする。[Operation] When high frequency is injected into the distribution line, ground fault, leakage,
A weak magnetic field is generated in a sound distribution line up to the point of accident such as disconnection. When the field detection coil is brought close to the distribution line, a weak magnetic field is generated. A detection (induced) voltage is generated in the field detection coil at a healthy distribution line position, but a weak magnetic field is not generated or is extremely weak at the accident point position. And the detection voltage disappears. The accident point judging device detects the disappearance of the detected voltage and judges the accident point.
【００１４】[0014]
【実施例】本発明の実施例について図１を参照して説明
する。図１において、１は隠蔽された屋内配電ケーブ
ル、２はこの配電ケーブルに商用電源を接続する配電用
遮断器、３は負荷機器類、１０は配電線路事故点探索装
置で、配電ケーブル１の始端Ａ側に約１ＫＨｚの高周波
信号を供給する高周波信号発生器１１と、この高周波信
号の供給により配電線に発生する高周波微弱磁界を検出
する磁界検出コイル１３を備えた事故点判定器１２から
構成されている。Embodiments of the present invention will be described with reference to FIG. In FIG. 1, 1 is a concealed indoor power distribution cable, 2 is a circuit breaker for connecting a commercial power source to this power distribution cable, 3 is load equipment, 10 is a distribution line fault point search device, and the starting end of the power distribution cable 1 It is composed of a high frequency signal generator 11 for supplying a high frequency signal of about 1 KHz to the A side, and an accident point determiner 12 having a magnetic field detection coil 13 for detecting a high frequency weak magnetic field generated in a distribution line by the supply of this high frequency signal. ing.
【００１５】次に、この配電線路事故点探索装置１０の
使用方法及び動作について説明する。高周波信号発生器
１１の高周波信号を配電ケーブル１の始端Ａ側に供給
し、磁界検出コイル１３を配電ケーブル１に近づけて移
動させる。Next, the method of using and the operation of the distribution line fault point search device 10 will be described. The high frequency signal of the high frequency signal generator 11 is supplied to the starting end A side of the power distribution cable 1, and the magnetic field detection coil 13 is moved closer to the power distribution cable 1.
【００１６】配電ケーブル１に地絡，漏電，断線等がな
い場合は、高周波信号は配電ケーブル１の全線に流れる
ので、配電ケーブルの全線に亘ってケーブルの周囲に微
弱磁界ａが発生する。When the power distribution cable 1 does not have a ground fault, an electric leakage, a wire break, or the like, a high-frequency signal flows through all lines of the power distribution cable 1, so that a weak magnetic field a is generated around the entire power distribution cable.
【００１７】図１に示すように、配電ケーブル１の負荷
３2及び３3側ケーブル１2の途中に地絡又は漏電事故Ｆ
が発生している場合は、事故点Ｆより負荷３2，３3側の
ケーブル１2，１3部分からは微弱磁界が発生しない（又
は極めて弱くなる。） 磁界検出コイル１３は高周波の微弱磁界を検出して電圧
を出力し、事故点判定器１２はこのコイルの電圧を増幅
しフイルタでノイズを除去し、整流平滑して検出電圧が
消えたとき事故点検出の判定をする。As shown in FIG. 1, a ground fault or an electric leakage accident F occurs in the middle of the load 3 2 and 3 3 side cable 1 2 of the distribution cable 1.
When the noise occurs, a weak magnetic field does not occur (or becomes extremely weak) from the cables 1 2 and 1 3 on the load 3 2 and 3 3 side from the accident point F. The magnetic field detection coil 13 has a high frequency weak magnetic field. Is detected and the voltage is output, and the accident point determiner 12 amplifies the voltage of this coil, removes noise with a filter, rectifies and smoothes, and determines the detection of the accident point when the detected voltage disappears.
【００１８】しかして、磁界検出コイル１３をケーブル
１に近づけて移動させ、事故点判定器１２の微弱磁界検
出の表示がなくなる位置を探すことによりケーブルの事
故点を判定することができる。Therefore, the fault point of the cable can be determined by moving the magnetic field detection coil 13 close to the cable 1 and searching for a position where the indication of the weak magnetic field detection of the fault point determination device 12 disappears.
【００１９】[0019]
【発明の効果】本発明は、上述のとおり構成されている
ので、次に記載する効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００２０】（１）配電ケーブルは高周波信号発生器の
継ぎ込みをするだけでよいので、配電ケーブルへの継ぎ
込み及び取り外しの機器数及び手間を大幅に簡素化でき
る。(1) Since it is only necessary to connect the high-frequency signal generator to the power distribution cable, the number and labor of the devices for connecting and disconnecting the power distribution cable can be greatly simplified.
【００２１】（２）配電ケーブルの固有インピーダンス
と関係なく事故点を探索できるので、電気的専門知識を
必要とすることなく、簡便かつ短時間に事故点の特定が
できる。(2) Since the accident point can be searched for regardless of the specific impedance of the power distribution cable, the accident point can be specified easily and in a short time without requiring electrical expertise.
【００２２】（３）露出及び隠蔽されている配電ケーブ
ルの事故点特定ができる。(3) The accident point of the exposed and concealed distribution cable can be identified.
【図１】実施例にかかる装置及び使用法を示す説明図。FIG. 1 is an explanatory diagram showing a device and a method of use according to an embodiment.
【図２】従来メガー法の原理説明図。FIG. 2 is an explanatory view of the principle of the conventional megger method.
【図３】負荷機器がある場合の回路説明図。FIG. 3 is an explanatory diagram of a circuit when there is a load device.
１…配電ケーブル（配電線路） ２…配電遮断器 ３…負荷機器類 １０…事故点探索装置 １１…高周波発生器 １２…事故点判定器 １３…磁界検出コイル ２０…メガー 1 ... Distribution cable (distribution line) 2 ... Distribution breaker 3 ... Load equipment 10 ... Accident point search device 11 ... High frequency generator 12 ... Accident point judgment device 13 ... Magnetic field detection coil 20 ... Megger
Claims (1)
発生器と、この高周波信号により配電線路に発生する微
弱磁界を配電線路に近づけ移動させて検出する界磁検出
コイルと、この界磁検出コイルの検出電圧の消えるのを
検出して事故点と判定する事故点判定器とからなること
を特徴とした配電線路事故点探索装置。1. A high frequency generator for injecting a high frequency signal into a power distribution line, a field detection coil for detecting a weak magnetic field generated in the power distribution line by the high frequency signal by moving the magnetic field close to the power distribution line, and this field detection coil. A fault detection device for a distribution line, comprising: an accident point determiner that detects the disappearance of the detection voltage of the above and determines an accident point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6233900A JPH0894699A (en) | 1994-09-29 | 1994-09-29 | Apparatus for searching for accident point of power distribution line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6233900A JPH0894699A (en) | 1994-09-29 | 1994-09-29 | Apparatus for searching for accident point of power distribution line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0894699A true JPH0894699A (en) | 1996-04-12 |
Family
ID=16962345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6233900A Pending JPH0894699A (en) | 1994-09-29 | 1994-09-29 | Apparatus for searching for accident point of power distribution line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0894699A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020122716A (en) * | 2019-01-31 | 2020-08-13 | 株式会社関電工 | Insulation monitoring device and method |
| CN111722022A (en) * | 2020-05-09 | 2020-09-29 | 上海达铭科技有限公司 | Cable path detection method based on weak magnetic signal measurement |
-
1994
- 1994-09-29 JP JP6233900A patent/JPH0894699A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020122716A (en) * | 2019-01-31 | 2020-08-13 | 株式会社関電工 | Insulation monitoring device and method |
| CN111722022A (en) * | 2020-05-09 | 2020-09-29 | 上海达铭科技有限公司 | Cable path detection method based on weak magnetic signal measurement |
| CN111722022B (en) * | 2020-05-09 | 2023-02-14 | 上海达铭科技有限公司 | Cable path detection method based on weak magnetic signal measurement |
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