JP2885932B2 - Transmission line fault section identification system - Google Patents

Transmission line fault section identification system

Info

Publication number
JP2885932B2
JP2885932B2 JP2316557A JP31655790A JP2885932B2 JP 2885932 B2 JP2885932 B2 JP 2885932B2 JP 2316557 A JP2316557 A JP 2316557A JP 31655790 A JP31655790 A JP 31655790A JP 2885932 B2 JP2885932 B2 JP 2885932B2
Authority
JP
Japan
Prior art keywords
line
underground
transmission line
fault
overhead
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
Application number
JP2316557A
Other languages
Japanese (ja)
Other versions
JPH04190642A (en
Inventor
克郎 篠田
裕幸 勝川
悟 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIPPON GAISHI KK
Original Assignee
NIPPON GAISHI KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NIPPON GAISHI KK filed Critical NIPPON GAISHI KK
Priority to JP2316557A priority Critical patent/JP2885932B2/en
Publication of JPH04190642A publication Critical patent/JPH04190642A/en
Application granted granted Critical
Publication of JP2885932B2 publication Critical patent/JP2885932B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

Landscapes

  • Locating Faults (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は架空線路と地中線路とが接続されている送電
線において地絡事故が発生した際に、故障点が架空線路
側か地中線路側かを遠隔地から容易に知ることができる
ようにした送電線故障区間判定システムに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a method for detecting a fault point on an overhead line or underground when a ground fault occurs in a transmission line connecting the overhead line and an underground line. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line fault section determination system which can easily determine whether a track is on the side of a transmission line from a remote location.

（従来の技術） 架空線路と地中線路とが接続されている送電線におい
て地絡事故が発生し回路遮断器が作動したとき、地中線
路側で故障が発生した場合には地中ケーブルの絶縁破壊
を伴っていると考えられるので再投入を行うと事故の拡
大を招く危険がある。これに対して架空線路側で故障が
発生した場合には直ちに再投入を行い停電の早期復旧を
図る必要がある。(Conventional technology) When a ground fault occurs on a transmission line connecting an overhead line and an underground line and a circuit breaker is activated, if a failure occurs on the underground line side, There is a danger that accidents will be spread if re-input is performed because it is considered to be accompanied by dielectric breakdown. On the other hand, when a fault occurs on the overhead line, it is necessary to immediately re-enter the power line to recover the power failure early.

このため、事故区間が地中線路側と架空線路側のいず
れであるかを遠隔の監視所等において直ちに判別できる
システムが望まれている。For this reason, a system that can immediately determine whether the accident section is on the underground track side or the overhead track side at a remote monitoring station or the like is desired.

ところが、従来のシステムにおいては両者の接続部に
設けられたブッシングの地中線路側に電流センサを取付
けていたため、接続部のブッシングの内部で故障が発生
した場合にはその電流センサよりも架空線路側で事故が
発生したとの判断がなされる。このためにブッシングの
内部における事故を架空線路側の事故と誤認してただち
に電源の再投入が行われ、事故を拡大してしまうおそれ
があった。However, in the conventional system, the current sensor is mounted on the underground line side of the bushing provided at the connection portion between the two, so if a failure occurs inside the bushing at the connection portion, the overhead sensor is replaced by an overhead line. The side determines that an accident has occurred. For this reason, an accident inside the bushing was mistaken for an accident on the overhead track side, and the power supply was immediately turned on again, possibly leading to an increase in the accident.

（発明が解決しようとする課題） 本発明は上記したように従来の故障区間判別システム
において盲点となっていたブッシング部分における故障
を正しく地中線路側の故障と判別できるようにし、これ
によって電源の再投入によるブッシング事故の拡大を防
止することができる送電線故障区間判別システムを提供
することを目的として完成されたものである。(Problems to be Solved by the Invention) As described above, the present invention enables a failure in a bushing portion, which has been a blind spot in the conventional failure section determination system, to be correctly determined to be a failure on the underground line side, thereby reducing the power supply. It has been completed for the purpose of providing a transmission line fault section discrimination system capable of preventing the expansion of a bushing accident due to re-input.

（課題を解決するための手段） 上記の課題を解決するためになされた本発明は、送電
線を架空線路からブッシングを介して地中線路へ接続す
る部分の架空線路側の課電部に光CTを取付けるととも
に、地中線路側に電圧センサを取付け、これらの出力信
号により故障が発生した際の故障点の方向を判別するこ
とを特徴とするものである。(Means for Solving the Problems) In order to solve the above problems, the present invention provides an optical power supply unit on an overhead line side of a portion connecting a transmission line from an overhead line to an underground line via a bushing. In addition to mounting a CT, a voltage sensor is mounted on the underground line side, and the direction of the fault point when a fault occurs is determined based on these output signals.

以下に本発明を図示の実施例により更に詳細に説明す
る。Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments.

（実施例） 第１図は送電線路の全体を概念的に示す図であり、
（１）は電源、（２）は架空線路、（３）は地中線路、
（４）は負荷であり、架空線路（２）と地中線路（３）
との接続部分にはブッシング（５）が設けられている。(Embodiment) FIG. 1 is a diagram conceptually showing the entire transmission line.
(1) Power supply, (2) Overhead track, (3) Underground track,
(4) is a load, an overhead line (2) and an underground line (3)
A bushing (5) is provided at the connection portion with the bushing (5).

第２図は本発明の故障区間判別システムの要部を示す
ものであり、図示のようにブッシング（５）よりも上方
の架空線路（２）側の課電部に、光CT（６）が取付けら
れている。光CT（６）は課電部の導体に流れる電流によ
って発生する磁界の強さをBSOのようなファラディー素
子により光信号に変換し、光ファイバ（７）を通じて光
検出器（８）へ取出すことができるもので、架空線路
（２）側の各相の導体の電流を検出することができる。
実施例では光CT（６）は光ファイバ内蔵碍子（８）の上
端に支持されており、光ファイバ（７）は碍子内部を貫
通して接地側に引き出されている。各相の光CT（６）か
ら取出された光信号は光検出器（８）により電気信号に
変換されたうえで零相合成器（９）で零相合成される。
この結果、平常時には各相の電流が互いに打ち消し合っ
て零相合成後の出力はゼロとなるが、いずれかの相で事
故が発生すると三相のバランスが崩れ、零相合成器
（９）からの出力がゼロとはならないのでこれをレベル
検出器（10）でレベル検出する。このようにして架空線
路（２）側の光CT（６）により事故発生が検出できる。FIG. 2 shows a main part of the fault section discrimination system of the present invention. As shown, an optical CT (6) is provided in the power application section on the overhead line (2) above the bushing (5). Installed. The optical CT (6) converts the intensity of the magnetic field generated by the current flowing through the conductor of the power application unit into an optical signal by a Faraday element such as BSO, and extracts the optical signal through an optical fiber (7) to a photodetector (8). It is possible to detect the current of the conductor of each phase on the overhead line (2) side.
In the embodiment, the optical CT (6) is supported on the upper end of the insulator (8) with a built-in optical fiber, and the optical fiber (7) is drawn through the inside of the insulator to the ground side. The optical signal extracted from the optical CT (6) of each phase is converted into an electric signal by a photodetector (8), and then zero-phase synthesized by a zero-phase synthesizer (9).
As a result, in normal times, the currents of the respective phases cancel each other out, and the output after the zero-phase synthesis becomes zero. However, if an accident occurs in any phase, the three-phase balance is lost, and the zero-phase synthesizer (9) Is not zero, the level is detected by the level detector (10). In this way, the occurrence of an accident can be detected by the optical CT (6) on the overhead line (2).

また地中線路（３）側に電圧センサ（11）が取付けら
れている。その出力は検出部（12）を介して上記の光CT
（６）からの出力とともに表示部（13）に表示され、公
知の通信手段によって遠隔の監視所等へ伝送される。A voltage sensor (11) is mounted on the underground line (3). The output is sent to the optical CT through the detector (12).
It is displayed on the display unit (13) together with the output from (6), and is transmitted to a remote monitoring station or the like by a known communication means.

（作用） このように構成された本発明の送電線故障区間判別シ
ステムにおいては、地中線路（３）において地絡事故が
発生したときにもブッシング（５）の内部で地絡事故が
発生したときにも架空線路（２）に事故電流が流れ光CT
（６）により検出される。これに対して架空線路（２）
において地絡事故が発生したときには光CT（６）は電流
を検出しない。従って本発明によれば架空線路（２）側
の事故か地中線路（３）側の事故かを正確に判別できる
ことは勿論のこと、ブッシング（５）の内部において地
絡事故を生じた場合にはこれを電源の再投入を行わない
地中線路（３）側の事故と判別することとなる。このた
め、ブッシング（５）の内部で地絡事故が生じた時に架
空線路（２）側の事故と誤認して電源の再投入を行うこ
とがなく、事故の拡大を防止できる。(Operation) In the transmission line fault section discrimination system of the present invention configured as described above, a ground fault occurs inside the bushing (5) even when a ground fault occurs in the underground line (3). Even when an accident current flows through the overhead line (2), optical CT
It is detected by (6). On the other hand, overhead track (2)
In the case where a ground fault has occurred, the optical CT (6) does not detect the current. Therefore, according to the present invention, it is of course possible to accurately determine whether the accident is on the overhead line (2) or on the underground line (3), and when an earth fault occurs inside the bushing (5). Is determined to be an accident on the underground track (3) side where the power is not turned on again. For this reason, when a ground fault occurs inside the bushing (5), the power supply is not turned on again by mistakenly recognizing the fault on the overhead line (2) side, thereby preventing the spread of the fault.

また本発明においては地中線路（３）側に電圧センサ
（11）を取付けてあるので電流と電圧との位相差によっ
て事故電流の流れる方向を判別することができ、負荷側
が事故を生じたものとは別の系路により電源に接続され
ており、架空線路（２）の事故点に向かって事故電流が
負荷側から流れるような場合にも、事故区間が架空線路
（２）側か地中線路（３）側かを正確に判別することが
できる。なお電圧センサ（11）を地中線路（３）側に設
けたのは絶縁や取付けが容易であり、設備コストを低減
できるためである。Further, in the present invention, since the voltage sensor (11) is attached to the underground line (3), the direction of the fault current can be determined by the phase difference between the current and the voltage, and the fault occurs on the load side. When the fault current flows from the load side toward the fault point of the overhead line (2), the fault section is connected to the overhead line (2) side or underground. It is possible to accurately determine whether it is the line (3) side. The reason why the voltage sensor (11) is provided on the underground line (3) is that insulation and mounting are easy, and equipment costs can be reduced.

（発明の効果） 本発明は以上に説明したように、従来の故障区間判別
システムにおいて盲点となっていたブッシングの内部に
おける地絡事故を地中線路側の事故と正しく判別するこ
とができるものであり、従来のようにブッシング内部の
事故を誤って、架空線路側の事故と判別し、電源を再投
入して事故を拡大するおそれを防止することができる。
また本発明では電圧センサを地中線路側に取付けたの
で、光CTにより検出された電流と電圧センサにより検出
された電圧との位相差によって事故電流の方向をも正し
く判別できるうえ、電圧センサをも架空線路側に設置し
た場合に比較して全体としての設備コストを低減するこ
とができる。よって、本発明は従来の問題点を一掃した
送電線故障区間判別システムとして、産業の発展に寄与
するところは極めて大である。(Effects of the Invention) As described above, the present invention is capable of correctly determining a ground fault inside a bushing, which has been a blind spot in a conventional failure section determination system, as an underground track side accident. In addition, it is possible to prevent the accident inside the bushing from being erroneously determined as an accident on the overhead track side, and prevent the accident from being enlarged by turning on the power again.
Also, in the present invention, since the voltage sensor is mounted on the underground line side, the direction of the fault current can be correctly determined by the phase difference between the current detected by the optical CT and the voltage detected by the voltage sensor, and the voltage sensor can be used. Also, the equipment cost as a whole can be reduced as compared with the case where it is installed on the overhead line. Therefore, the present invention greatly contributes to the development of industry as a transmission line fault zone determination system that has eliminated the conventional problems.

【図面の簡単な説明】[Brief description of the drawings]

第１図は送電線路の全体を概念的に示す系統図、第２図
は本発明の実施例の要部を示すブロック図である。 （２）：架空線路、（３）：地中線路、（５）：ブッシ
ング、（６）：光CT、（11）：電圧センサ。FIG. 1 is a system diagram conceptually showing the entire transmission line, and FIG. 2 is a block diagram showing a main part of an embodiment of the present invention. (2): overhead track, (3): underground track, (5): bushing, (6): optical CT, (11): voltage sensor.

フロントページの続き (56)参考文献 特開 昭61−139221（ＪＰ，Ａ) 特開 昭63−274311（ＪＰ，Ａ) 特開 平１−311283（ＪＰ，Ａ) 特開 昭52−33047（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) H02J 13/00 - 13/00 311 G01R 31/08 Continuation of the front page (56) References JP-A-61-139221 (JP, A) JP-A-63-274311 (JP, A) JP-A-1-311283 (JP, A) JP-A-52-33047 (JP, A) , A) (58) Fields investigated (Int. Cl. 6 , DB name) H02J 13/00-13/00 311 G01R 31/08

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】送電線を架空線路からブッシングを介して
地中線路へ接続する部分の架空線路側の課電部に光CTを
取付けるとともに、地中線路側に電圧センサを取付け、
これらの出力信号により故障が発生した際の故障点の方
向を判別することを特徴とする送電線故障区間判別シス
テム。An optical CT is attached to a power application section on the overhead line side where a transmission line is connected from an overhead line to an underground line via a bushing, and a voltage sensor is attached to the underground line side.
A transmission line fault zone determination system that determines the direction of a fault point when a fault occurs based on these output signals.
JP2316557A 1990-11-21 1990-11-21 Transmission line fault section identification system Expired - Lifetime JP2885932B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2316557A JP2885932B2 (en) 1990-11-21 1990-11-21 Transmission line fault section identification system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2316557A JP2885932B2 (en) 1990-11-21 1990-11-21 Transmission line fault section identification system

Publications (2)

Publication Number Publication Date
JPH04190642A JPH04190642A (en) 1992-07-09
JP2885932B2 true JP2885932B2 (en) 1999-04-26

Family

ID=18078427

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2316557A Expired - Lifetime JP2885932B2 (en) 1990-11-21 1990-11-21 Transmission line fault section identification system

Country Status (1)

Country Link
JP (1) JP2885932B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102350387B1 (en) * 2015-06-08 2022-01-18 한국전력공사 Apparatus and method for detecting fault line
GB2548863A (en) * 2016-03-31 2017-10-04 4Eco Ltd Contactless system for measuring power flow direction

Also Published As

Publication number Publication date
JPH04190642A (en) 1992-07-09

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