JPH01284773A - Locating system for accident section of electric power cable line - Google Patents

Abstract

PURPOSE:To locate an accident section with an on-line by detecting the accident in a power cable section with a phase difference of the composed value of electric conductor currents which are detected by optical CTs, and transmitting surge voltages measured with optical volt boxes to a central apparatus. CONSTITUTION:The conductor currents which are detected by the optical CTs provided in both ends of the power cable are made to be zero-phase-sequence currents by means of composing them at each detecting device 9, 9'. The zero- phase-sequence current of one device 9 is sent to another device 9', wherein the phase comparison is made with the composed zero-phase-sequence current, and basing on the above result, the signal of an accident occurred in the cable section is transmitted to the central apparatus 12. The surge voltages on the connecting parts 2 are measured by the optical voltage divider 7 installed on each general connection part 2 and stored temporarily in the detecting device 10, then transmitted to the apparatus 12. The information of that the accident point exists between two adjacent points having high surge voltages, is outputted by the apparatus 12. The accident section can be thereby located with the on-line.

Description

【発明の詳細な説明】 （産業上の利用分軒） 本発明は３心ＯＦケーブルやトリプレブクス型電力ケー
ブルのようなソリッドボンド接地光電力ケーブルで構成
されている長距離の電力ケーブル線路の事故区間をオン
ラインで標定する電力ケーブル線路の事故区間標定シス
テムに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Applications) The present invention applies to fault sections of long-distance power cable lines consisting of solid bond grounded optical power cables such as three-core OF cables and triplebux-type power cables. This is a fault section locating system for power cable lines that locates faults online.

（従来の技術及び解決しようとする課題）従来、３心Ｏ
Ｆケーブルやトリプレックス型電力ケーブルで構成され
ている電力ケーブル線路のオンラインでの検出方法はな
く、事故発生後、マレ−ループ法や高圧サージ法等で事
故点を探査する方法が採用されている。(Conventional technology and problems to be solved) Conventionally, three-core O
There is no online detection method for power cable lines consisting of F cables and triplex type power cables, and after an accident occurs, methods such as the Murray loop method and high voltage surge method are used to search for the fault point. .

しかし、これらの方法ではたとえケーブル部が破壊して
いることが判っていても、位置を検出するのに非常に手
間取るケースが多く、特に高圧サージ法では、終端がガ
ス中終端あるいは油中終端の場合には終端を解体する必
要があり、大変な労力がかかると共に復旧に相当の時間
を要するという問題があった。However, with these methods, even if it is known that the cable section is damaged, it is often very time-consuming to detect the location.Especially with the high-pressure surge method, it is difficult to detect the cable end in gas or oil. In some cases, it is necessary to dismantle the terminal end, which poses the problem of requiring a great deal of labor and a considerable amount of time for restoration.

（課題を解決するための手段） 本発明は上述の問題点を解消し、オンラインでの事故区
間の標定を可能にした電力ケーブル線路の事故区間標定
システムを提供するもので、その特徴は電力ケーブル線
路の両端に設置した光ＣＴで検出した導体電流の合成値
（零相電流）の位相差によりケーブル区間の事故を検知
し、又電力ケーブル線路の各普通接続箱に取付けた光分
圧器により測定したサージ電圧を中央装置に伝送し、こ
れらの情報をもとに中央装置で事故区間を標定すること
にある。(Means for Solving the Problems) The present invention solves the above-mentioned problems and provides an accident section locating system for power cable lines that makes it possible to locate an accident section online. Faults in cable sections are detected by the phase difference of the composite value (zero-sequence current) of conductor currents detected by optical CT installed at both ends of the line, and also measured by optical voltage dividers installed in each ordinary junction box of the power cable line. The purpose of this system is to transmit the generated surge voltage to the central equipment, and based on this information, the central equipment locates the accident section.

第１図は本発明の電力ケーブル線路の事故区間標定シス
テムの具体例の説明図である。FIG. 1 is an explanatory diagram of a specific example of the fault area locating system for power cable lines according to the present invention.

図面において、（１）は３心ＯＦケーブル等の３心電力
ケーブル、（２）はその普通接続部、（３）は接地線、
（４）は電力ケーブル（＋）の両端に設けた終端箱であ
る。（５）は各終端部に設置した導体電流検出用の光Ｃ
Ｔで、光磁界センサと高磁性体コアにより構成されてい
る。（６）は光ＣＴで検出された導体電流を検出装置（
９）に伝送する２心光ケーブル、（））は各普通接続部
（２）のサージ電圧測定用の光分圧器で、第２図に示す
ように光電圧センサ（１３）が組込まれており、その測
定値は２心光ケーブル（８）により検出装置１２（１Ｇ
）に伝送される。（９）（９’）は光／電気、電気／光
変換器、零相電流端末及び２つの零相電流の位相比較判
別機能を持つ検出装置Ｎ　（ｔｏ）は光／電気、電気／
光変換器及びサージ電圧伝送機能を何する検出装置Ｓ　
（Ｏ）は光ケーブル、（＋２）は中央装置（コンピュー
タ）である。In the drawing, (1) is a three-core power cable such as a three-core OF cable, (2) is its normal connection, (3) is a ground wire,
(4) is a termination box provided at both ends of the power cable (+). (5) is the light C installed at each terminal for detecting conductor current.
It is composed of an optical magnetic field sensor and a highly magnetic core. (6) is a detection device (
9) is an optical voltage divider for measuring the surge voltage at each normal connection part (2), and as shown in Figure 2, an optical voltage sensor (13) is incorporated. The measured value is detected by the detection device 12 (1G
). (9) (9') is a detection device N that has an optical/electrical, electrical/optical converter, a zero-sequence current terminal, and a phase comparison/discrimination function for two zero-sequence currents (to) is an optical/electrical, electrical/optical converter.
Detection device S with optical converter and surge voltage transmission function
(O) is an optical cable, and (+2) is a central device (computer).

（作用） まず、電力ケーブル両端に設置した光ＣＴ　（５）で検
出した導体電流を、それぞれ検出装置（９）（９’）で
合成して零相電流となし、一方の検出装置（９）の零相
電流を他方の検出装置（３′）に送り、そこで合成され
た零相電流と位相比較し、その結果にもとづいて、ケー
ブル区間での事故という信号を中央装置（Ｉ２）に伝送
する。(Function) First, the conductor currents detected by the optical CT (5) installed at both ends of the power cable are combined by the detection devices (9) and (9') to form a zero-sequence current, and one of the detection devices (9) The zero-sequence current is sent to the other detection device (3'), where the phase is compared with the synthesized zero-sequence current, and based on the result, a signal indicating an accident in the cable section is transmitted to the central device (I2). .

一方、各普通接続部（２）に取付けた光分圧器（７）で
、各普通接続部（２）のサージ電圧を測定し、−時的に
検出装置００）にメモリーされ、中央装置（Ｉ２）に伝
送される。On the other hand, the optical voltage divider (7) attached to each common connection (2) measures the surge voltage of each common connection (2), which is temporarily stored in the detection device 00) and stored in the central device (I2). ).

中央装置（１２）では、前述のように検出装置（９′）
から、ケーブル区間での事故゛という情報を得た場合の
み、第３図（Ａ）のように、各普通接続部（２）のサー
ジ電圧分布を求め、サージ電圧の高い隣接する２点間に
事故点が存在するという情報を出力する。In the central device (12), as mentioned above, the detection device (9')
Only when information is obtained that there is an accident in the cable section, as shown in Figure 3 (A), the surge voltage distribution at each normal connection (2) is determined, and the surge voltage distribution is determined between two adjacent points with high surge voltage. Information indicating that an accident point exists is output.

この場合、零相電流の位相比較が必要な理由は、例えば
架空線から心線サージが侵入した場合、普通接続部のサ
ージ電圧は第３図（Ｂ）のように、終端の３叉分岐部が
最も高く、遠端に行くに従ってサージ電圧は小さくなる
。シース電圧の高い２点間を事故とすると開閉サージの
場合でもケーブル事故区間を表示することになり、これ
を防止するためである。In this case, the reason why it is necessary to compare the phase of the zero-sequence current is that, for example, if a core wire surge enters from an overhead line, the surge voltage at the normal connection will be reduced to the three-pronged branch at the end, as shown in Figure 3 (B). is the highest, and the surge voltage decreases toward the far end. This is to prevent the cable failure section from being displayed even in the case of an opening/closing surge if an accident occurs between two points with high sheath voltage.

なお、第１図は３心電力ケーブルの場合を示したが、ト
リプレックス電力ケーブルの場合は、普通接続部（２）
に対して第４図のように光分圧器を取付ける。Although Figure 1 shows the case of a three-core power cable, in the case of a triplex power cable, the normal connection part (2)
Attach an optical voltage divider to it as shown in Figure 4.

（発明の効果） 従来、長距離の３心電力ケーブル、トリプレックス型電
力ケーブルの事故区間の標定は、前述のように事故後心
線にサージ電圧を加えて行なうため、事故区間の標定及
び復旧に多大の時間と手間を必要としていたが、上述し
た本発明の標定システムによれば、事故後すぐにオンラ
インで事故区間の標定が可能となり、標定及び復旧時間
を短縮出来るので、経済的にも極めて効果的である。(Effects of the Invention) Conventionally, the fault section of long-distance three-core power cables and triplex power cables has been oriented by applying surge voltage to the core wires after the fault, as described above, which makes it difficult to locate and restore the fault section. However, according to the above-mentioned location system of the present invention, it is possible to locate the accident section online immediately after the accident, and the time for location and recovery can be shortened, making it economically viable. Extremely effective.

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

第１図は本発明の電力ケーブル線路の事故区間標定シス
テムの具体例の説明図である。 第２図は第１図において、光電圧センサを組込んだ光分
圧器の説明図である。 第３図はサージ電圧分布の説明図である。 第４図はトリプレックス型電力ケーブルの場合の、普通
接続部に対する光分圧器取付けの説明図である。 １・・・３心電力ケーブル、２・・・普通接続部、３・
・・接地線、４・・・終端箱、５・・・光ＣＴ、８・・
・２心光ケーブル、７・・・光分圧器、８・・・２心光
ケーブル、９・・・光／電気、電気／光変換器、零相電
流端末及び２つの零相電流の位相比較判別機能をもつ検
出装置、１０・・・光／電気、電気／光変喚器及びサー
ジ電圧伝送機能をもつ検出装置、！鵞・・・光ケーブル
、＋２・・・中央装置、＋３・・・光電圧センサ。FIG. 1 is an explanatory diagram of a specific example of the fault area locating system for power cable lines according to the present invention. FIG. 2 is an explanatory diagram of an optical voltage divider incorporating an optical voltage sensor in FIG. 1. FIG. 3 is an explanatory diagram of surge voltage distribution. FIG. 4 is an explanatory diagram of the attachment of an optical voltage divider to a normal connection part in the case of a triplex type power cable. 1...3-core power cable, 2...normal connection part, 3...
...Grounding wire, 4...Terminal box, 5...Optical CT, 8...
・2-core optical cable, 7... Optical voltage divider, 8... 2-core optical cable, 9... Optical/electrical, electrical/optical converter, zero-sequence current terminal and phase comparison discrimination function of two zero-phase currents Detection device with 10... optical/electrical, electrical/optical converter and surge voltage transmission function,! Goose: Optical cable, +2: Central device, +3: Optical voltage sensor.

Claims (2)

【特許請求の範囲】[Claims] （１）３心電力ケーブル又はトリプレックス型電力ケー
ブルのようなソリッドボンド接地系電力ケーブル線路の
両端に設置した光ＣＴで検出した導体電流の合成値（零
相電流）の位相差によりケーブル区間の事故を検知し、
又電力ケーブル線路の各普通接続箱に取付けた光分圧器
により測定したサージ電圧を中央装置に伝送し、これら
の情報をもとに中央装置で事故区間を標定することを特
徴とする電力ケーブル線路の事故区間標定システム。(1) The phase difference between the composite value of conductor currents (zero-sequence current) detected by optical CT installed at both ends of a solid bond grounded power cable line such as a three-core power cable or triplex type power cable is used to determine the difference between cable sections. Detect accidents,
Also, a power cable line characterized in that the surge voltage measured by an optical voltage divider attached to each ordinary junction box of the power cable line is transmitted to a central device, and the fault section is located by the central device based on this information. Accident zone location system. （２）光ＣＴが光磁界センサーと高磁性体コアで構成さ
れており、光分圧器には光電圧センサが組込まれている
ことを特徴とする請求項（１）記載の電力ケーブル線路
の事故区間標定システム。(2) An accident on a power cable line according to claim (1), wherein the optical CT is composed of an optical magnetic field sensor and a highly magnetic core, and the optical voltage divider has a built-in optical voltage sensor. Sectional location system.