JPH0241255B2 - - Google Patents
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- Publication number
- JPH0241255B2 JPH0241255B2 JP56110216A JP11021681A JPH0241255B2 JP H0241255 B2 JPH0241255 B2 JP H0241255B2 JP 56110216 A JP56110216 A JP 56110216A JP 11021681 A JP11021681 A JP 11021681A JP H0241255 B2 JPH0241255 B2 JP H0241255B2
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- JP
- Japan
- Prior art keywords
- accident
- fault
- cabinet
- circuit
- signal
- 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
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- Locating Faults (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Communication Cables (AREA)
- Structure Of Telephone Exchanges (AREA)
Description
【発明の詳細な説明】
本発明は例えば、地絡、短絡等の事故点投入を
行わないで事故区分することによつて安全性を高
めた地中配電線事故区分装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underground distribution line fault classification device that improves safety by classifying faults such as ground faults and short circuits without introducing fault points.
従来の地中配電線の事故区分方式として、例え
ば、閉開器キヤビネツト区間を順次測定器を使用
してマニユアル的に事故探査し、事故点を区分し
た後健全区間へ送電するようにしたものがある。 A conventional fault classification method for underground power distribution lines, for example, involves manually searching for faults in the switch cabinet sections one by one using a measuring device, classifying fault points, and then transmitting power to healthy sections. be.
しかし、この方式によれば、測定作業者が閉開
器キヤビネツト区間を順次測定するようにしてい
るため、事故探査に多くの時間を要する。 However, according to this method, the measurement operator sequentially measures the switchgear cabinet sections, so it takes a lot of time to investigate the fault.
また、従来の架空系の事故区分方式として、例
えば、特開昭53−35942号公報に示されるように、
事故点を探査する事故捜査器と、この事故捜査器
が出力する制御信号によつて開閉が制御される開
閉器とを備え、事故が発生したとき変電所の保護
リレーで遮断し、再閉路して事故点に投入した後
再々閉路によつて事故点を区分し、健全区間へ送
電するようにしたものがある。 In addition, as a conventional accident classification method for hypothetical systems, for example, as shown in Japanese Patent Application Laid-Open No. 53-35942,
It is equipped with an accident investigation device that searches for the accident point, and a switch whose opening and closing are controlled by the control signal output by this accident investigation device.When an accident occurs, the substation's protection relay shuts off and recloses the circuit. There is a system in which the fault point is separated by closing the circuit again after the power is input to the fault point, and the power is transmitted to the healthy section.
しかし、この再々閉路の方式によれば、再閉路
時に事故点投入を行うため、これを地中配電線に
適用すると開閉器キヤビネツト等が路上設置され
ているため、公衆安全上問題を生じる恐れがあ
る。 However, according to this re-closing method, the fault point is injected at the time of re-closing, so if this is applied to underground distribution lines, there is a risk of public safety problems since switch cabinets etc. are installed on the road. be.
本発明は、上記に鑑み、事故点投入を行わない
で事故区分することによつて安全性を高めるた
め、事故捜査器の事故情報を各開閉器間で伝送
し、該当する開閉器の負荷側に位置する隣接開閉
器の負荷側線路の事故の有無に応じて各開閉器を
投入、あるいはロツクするようにした地中配電線
事故区分装置を提供するものである。 In view of the above, the present invention transmits accident information from the accident investigation device between each switch, in order to improve safety by classifying accidents without inputting fault points, and transmits accident information from the accident investigation device between each switch, and The present invention provides an underground distribution line fault classification device that closes or locks each switch depending on the presence or absence of an accident on the load side line of the adjacent switch.
以下、本発明による地中配電線事故区分装置を
詳細に説明する。 Hereinafter, the underground distribution line fault classification device according to the present invention will be explained in detail.
第１図は本発明の一実施例を示し、変電所バン
クに接続された多回路開閉器S0は送受信回路１を
有する。この送受信回路１は、次段のキヤビネツ
トC1に送信信号を送つたときそれに応答して該
キヤビネツトC1からその負荷側に事故が有ると
いう情報（以下、「事故情報」という）を受けた
場合該開閉器S0を投入し、前記負荷側に事故がな
いという情報（以下「無事故情報」という）を受
けた場合開閉器S0をロツクする制御信号を制御回
路（後述す）に出力する。多回路開閉器S0に接続
される配電系は、キヤビネツトC1，C2，C3，C4
の間に位置して各配電区間を形成する地中配電線
L1，L2，L3，L4，L5より構成されている。キヤ
ビネツトC1は開閉器S11，S12および送受信回路
２，３を、キヤビネツトC2は開閉器S21，S22およ
び送受信回路４，５を、キヤビネツトC3は開閉
器S31S32および送受信回路６，７を、キヤビネツ
トC4は開閉器S41，S42および送受信回路８，９を
それぞれ有している。地中配電線L1〜L5のうち、
地中配電線L5はループ点となり、送受信回路１
０を有する多回路開閉器Ｓに接続されている。 FIG. 1 shows an embodiment of the invention, in which a multi-circuit switch S 0 connected to a substation bank has a transmitting/receiving circuit 1 . When this transmitter/receiver circuit 1 sends a transmission signal to the next-stage cabinet C1 , and in response receives information from the cabinet C1 that there is an accident on the load side (hereinafter referred to as "accident information"), When the switch S0 is turned on and information indicating that there is no accident on the load side (hereinafter referred to as "accident-free information") is received, a control signal for locking the switch S0 is output to a control circuit (described later). The power distribution system connected to multi-circuit switch S 0 includes cabinets C 1 , C 2 , C 3 , C 4
Underground distribution lines located between and forming each distribution section
It is composed of L 1 , L 2 , L 3 , L 4 , and L 5 . Cabinet C 1 has switches S 11 and S 12 and transmitting/receiving circuits 2 and 3; cabinet C 2 has switches S 21 and S 22 and transmitting and receiving circuits 4 and 5; and cabinet C 3 has switches S 31 and S 32 and transmitting and receiving circuits. The cabinet C 4 has switches S 41 and S 42 and transmitting/receiving circuits 8 and 9, respectively. Among underground distribution lines L 1 to L 5 ,
Underground distribution line L 5 becomes a loop point, and transmitting/receiving circuit 1
0 is connected to the multi-circuit switch S.
第２図はキヤビネツトC1を示す。他のキヤビ
ネツトC2〜C4も同一の構成を有する。即ち、キ
ヤビネツトC1は開閉器S11，S12，S13（第１図では
S13を省略）および送受信回路２，３に加えて、
零相電圧V0、零相電流I0および短絡電流Isを入力
して事故有信号あるいは事故無信号を出力する事
故捜査器２０と、地中配電線L1およびL2に接続
された変圧器T1，T2からダイオードD1，D2を介
して充電され、送受信回路２，３に電源を供給す
る電源用バツテリ２１と、送受信回路２，３から
の制御信号によつて開閉器S11，ss12の投入、ロ
ツクを制御する制御回路２２，２３と、送受信回
路２，３が隣接するキヤビネツトの送受信回路か
ら受信した事故の有無信号に基づいて制御信号を
通過あるは遮断するゲート回路２４，２５を有し
ている。 Figure 2 shows cabinet C1 . The other cabinets C2 to C4 also have the same configuration. That is, the cabinet C 1 has switches S 11 , S 12 , S 13 (in Fig. 1
S 13 omitted) and transmitting/receiving circuits 2 and 3,
An accident investigation device 20 that inputs zero-sequence voltage V 0 , zero-sequence current I 0 and short-circuit current I s and outputs an accident signal or no accident signal, and a transformer connected to underground distribution lines L 1 and L 2 Switch S _ _ Control circuits 22 and 23 that control the input and lock of ss 11 and ss 12 , and a gate circuit that passes or blocks control signals based on the fault signal received by the transmitting and receiving circuits 2 and 3 from the transmitting and receiving circuit of the adjacent cabinet. 24, 25.
以下、動作を説明する。ここで、地中配電線
L3に事故が発生したと仮定する。すると変電所
において遮断器が動作して地中配電線L1〜L5を
遮断する。遮断により、各キヤビネツトC1〜C4
の各開閉器は開放する。この後、再閉器により多
回路開閉器S0まで充電される。この電充後、送受
信回路１が事故情報を要する送信信号f1を送信す
る。キヤビネツトC1の送受信回路２がその送信
信号f1を受信すると、事故捜査器２０が地中配電
線L3の事故に基づいてその負荷側に事故を検出
したこと知らせる信号を送受信回路２に出力す
る。送受信回路２は送信信号f1に応答して事故有
信号f2を送受信回路１へ出力する。送受信回路１
が事故有信号f2を受信すると、多回路開閉器S0が
投入されて地中配電線L1が充電される。このよ
うに、開閉制御の対象となる開閉器は、負荷側に
位置する隣接開閉器の負荷側線路に事故があると
きに投入され、その負荷側線路に事故がないとき
には投入されずロツクされる。この制御が順次負
荷側のキヤビネツトへ移行する。即ち、キヤビネ
ツトC1の送受信回路３が負荷側の隣接キヤビネ
ツトC2へ送信信号1を送信する。これに応答する
キヤビネツトC2の送受信回路４がキヤビネツト
C2に含まれた事故捜査器（図示せず）の信号に
基づいて事故有信号f2を送受信回路３へ出力す
る。この事故有信号f2を受信した送受信回路３は
制御信号をゲート回路２５および制御回路２２へ
出力する。事故有信号f2を受信したゲート回路２
５は通過状態を取るため、制御信号を直接入力す
る制御回路２２、およびゲート回路２５を介して
それを入力する制御回路２３の制御によつて開閉
器S11およびS12が投入される。開閉器S11および
S12の投入によつて地中配電線L2が充電される。
同じように、キヤビネツトC2の送受信回路５が
送受信信号f1を負荷側の隣接キヤビネツトである
キヤビネツトC3の送受信回路６へ送信する。こ
の送信によりキヤビネツトC3に含まれた事故捜
査器（図示せず）が負荷側に事故がないことを検
出すると、送受信回路６が事故無信号f3をキヤビ
ネツトC2の送受信回路５へ送信する。これを受
信した送受信回路５が制御信号を出力し、開閉器
S21だけを投入して開閉器S22を投入するゲート回
路（キヤビネツトC1のゲート回路２５に相当す
る）を遮断してロツクする。即ち、事故有信号に
基づく制御信号はゲート回路２４，２５を開放
し、かつ、制御信号２２，２３に開閉器S11，S12
を投入させる。一方、事故無信号に基づく制御信
号はゲート回路２４，２５を閉塞するように機能
する。しかし、ゲート回路２４，２５は回路構成
上１つしか閉塞されないので事故無信号に基づく
制御信号を受ける制御回路２２，２３の１つは開
閉器S11，S12の１つを投入させる。 The operation will be explained below. Here, underground distribution line
Assume that an accident occurs at L 3 . Then, the circuit breaker operates in the substation to cut off underground distribution lines L1 to L5 . Due to the isolation, each cabinet C 1 to C 4
Each switch shall be opened. After this, the recloser charges up to the multi-circuit switch S0 . After this charging, the transmitting/receiving circuit 1 transmits a transmission signal f1 that requires accident information. When the transmission/reception circuit 2 of the cabinet C 1 receives the transmission signal f 1 , the accident investigation device 20 outputs a signal to the transmission/reception circuit 2 informing that an accident has been detected on the load side based on the accident in the underground distribution line L 3 . do. The transmitting/receiving circuit 2 outputs an accident signal f 2 to the transmitting/receiving circuit 1 in response to the transmitted signal f 1 . Transmission/reception circuit 1
When receiving the fault signal f 2 , the multi-circuit switch S 0 is turned on and the underground distribution line L 1 is charged. In this way, the switch that is subject to switching control is closed when there is an accident on the load side line of the adjacent switch located on the load side, and is not closed and locked when there is no accident on the load side line. . This control is sequentially transferred to the load side cabinet. That is, the transmission/reception circuit 3 of the cabinet C1 transmits the transmission signal 1 to the adjacent cabinet C2 on the load side. The transmitter/receiver circuit 4 of the cabinet C2 that responds to this
An accident signal f2 is output to the transmitter/receiver circuit 3 based on a signal from an accident investigation device (not shown) included in C2 . The transmitting/receiving circuit 3 that has received this accident signal f 2 outputs a control signal to the gate circuit 25 and the control circuit 22 . Gate circuit 2 that received the accident signal f2
5 assumes a passing state, the switches S 11 and S 12 are closed under the control of the control circuit 22 that directly inputs the control signal and the control circuit 23 that inputs it via the gate circuit 25. Switchgear S 11 and
The underground distribution line L 2 is charged by the input of S 12 .
Similarly, the transmitter/receiver circuit 5 of the cabinet C2 transmits the transmitter/receiver signal f1 to the transmitter/receiver circuit 6 of the adjacent cabinet on the load side, the cabinet C3 . When the accident investigation device (not shown) included in the cabinet C 3 detects that there is no accident on the load side by this transmission, the transmission/reception circuit 6 transmits the no-fault signal f 3 to the transmission/reception circuit 5 of the cabinet C 2 . . The transmitter/receiver circuit 5 that receives this outputs a control signal and switches the switch.
The gate circuit (corresponding to the gate circuit 25 of the cabinet C1 ) that closes only the switch S21 and closes the switch S22 is shut off and locked. That is, the control signal based on the accident signal opens the gate circuits 24 and 25, and connects the control signals 22 and 23 to the switches S 11 and S 12 .
Let's put it in. On the other hand, the control signal based on the no-fault signal functions to block the gate circuits 24 and 25. However, since only one of the gate circuits 24 and 25 is closed due to the circuit configuration, one of the control circuits 22 and 23 that receives a control signal based on the no-fault signal closes one of the switches S 11 and S 12 .
以上の実施例は順送の場合であるが、以下、逆
送の実施例を説明する。逆送の場合、順送の場合
と投入条件が異なり、ループ点の多回路開閉器Ｓ
の送受信回路１０より送信信号f1をキヤビネツト
C4の送受信回路９へ送信する。すると、キヤビ
ネツトC4の送受信回路９が事故無信号f3に応答す
る。これは地中配電線L5に事故が無いことに基
づくものである。これによつて多回路開閉器Ｓが
投入される。次に、キヤビネツトC4の送受信回
路８が送信信号f1をキヤビネツトC3の送受信回路
７へ送信する。同じように、キヤビネツトC3の
送受信回路７が事故無信号f3で応答する。これは
地中配電線L4およびL5に事故が無いことに基づ
くものである。これによつて、キヤビネツトC4
の開閉器S41およびS42が投入される。更に、キヤ
ビネツトC3の送受信回路６が送信信号f1をキヤビ
ネツトC2の送受信回路５へ送信する。すると、
キヤビネツトC2の送受信回路５が事故有信号f2で
応答する。これは地中配電線L3の事故に基づく
ものである。これによつて、キヤビネツトC3の
開閉器S32だけが投入され、開閉器S31はロツクさ
れる。以上の操作によつて、事故点となつた地中
配電線I3が区分され、健全区間へ送電される。 Although the above embodiment is a case of forward feeding, an embodiment of reverse feeding will be described below. In the case of reverse feed, the closing conditions are different from those of forward feed, and the multi-circuit switch S at the loop point
The transmission signal f1 is sent from the transmission/reception circuit 10 of the cabinet.
It is transmitted to the transmitter/receiver circuit 9 of C4 . Then, the transmitter/receiver circuit 9 of the cabinet C4 responds to the no-fault signal f3 . This is based on the fact that there are no accidents on underground distribution line L5 . This closes the multi-circuit switch S. Next, the transmitter/receiver circuit 8 of the cabinet C4 transmits the transmission signal f1 to the transmitter/receiver circuit 7 of the cabinet C3 . Similarly, the transmitter/receiver circuit 7 of cabinet C3 responds with a no fault signal f3 . This is based on the fact that underground distribution lines L 4 and L 5 have no accidents. This allows cabinet C 4
switches S 41 and S 42 are closed. Further, the transmitting/receiving circuit 6 of the cabinet C3 transmits the transmission signal f1 to the transmitting/receiving circuit 5 of the cabinet C2 . Then,
The transmitter/receiver circuit 5 of the cabinet C2 responds with a fault signal f2 . This is based on the underground distribution line L3 accident. As a result, only the switch S32 of the cabinet C3 is closed, and the switch S31 is locked. Through the above operations, underground distribution line I3 , which was the point of failure, is divided and power is transmitted to the healthy section.
第３図は信号伝送ラインの一実施例を示し、第
１図および第２図で説明した送受信回路３，４
と、キヤビネツトC1の開閉器S12およびキヤビネ
ツトC2の開閉器S21の間に位置する地中配電線L2
（図示されているのはシース層）と、地中配電線
L2の１本のケーブルのシース層の外周に設けら
れ、送受信回路３，４に接続された変流器３ａ，
４ａを有している。地中配電線L2の各ケーブル
シース層は相間接続線で接続されるとともに接地
されており、該シース層を伝送用導体としてイン
ピーダンスの低い閉ループ回路を構成している。 FIG. 3 shows an example of a signal transmission line, and the transmitting/receiving circuits 3 and 4 explained in FIGS. 1 and 2.
and underground distribution line L 2 located between switch S 12 of cabinet C 1 and switch S 21 of cabinet C 2
(Illustrated is sheath layer) and underground distribution line
A current transformer 3a provided on the outer periphery of the sheath layer of one cable of L2 and connected to the transmitting and receiving circuits 3 and 4,
4a. Each cable sheath layer of the underground power distribution line L2 is connected by an interphase connection line and also grounded, and forms a closed loop circuit with low impedance using the sheath layer as a transmission conductor.
以上の構成において、送受信回路３が送信信号
f1を出力すると、変流器３ａを介して該信号f1に
応じた信号電流がシース層に誘導され、循環電流
（点線図示したように）として流れる。そのため
送受信回路４は変流器４ａを介して送信信号f1を
受信し、事故状況に応じて事故有信号f2あるいは
事故無信号f3を出力すると、同じようにして送受
信回路３がこれを受信することができ、それによ
つて開閉器S12を制御する。この実施例によれば
シース層によつて構成された閉ループ回路はイン
ピーダンスが非常に低いために送受信回路３，４
の信号出力電圧が非常に小さいレベルであつても
信号伝送に必要な信号電流を誘起することができ
る。また、誘起された信号電流は閉ループ回路か
ら外部へ流出するようなこともない。 In the above configuration, the transmitting/receiving circuit 3 receives the transmitting signal.
When f 1 is output, a signal current corresponding to the signal f 1 is induced in the sheath layer via the current transformer 3a, and flows as a circulating current (as shown by the dotted line). Therefore, when the transmitting/receiving circuit 4 receives the transmitting signal f 1 via the current transformer 4a and outputs an accident signal f 2 or no accident signal f 3 depending on the accident situation, the transmitting/receiving circuit 3 receives the transmission signal f 1 in the same way. can be received and thereby control the switch S 12 . According to this embodiment, the closed loop circuit constituted by the sheath layer has very low impedance, so the transmitter/receiver circuits 3 and 4
Even if the signal output voltage is at a very low level, it is possible to induce the signal current necessary for signal transmission. Further, the induced signal current does not flow out from the closed loop circuit.
尚、第１図より第３図において、送受信回路１
〜１０の送信信号をf1、事故有信号をf2、事故無
信号をf3としたが、各送受信回路１〜１０におい
て、各信号の周波数を変えるようにしても良い。 In addition, in FIG. 3 from FIG. 1, the transmitter/receiver circuit 1
Although the transmission signal of 1 to 10 is f1, the accident signal is f2 , and the no accident signal is f3 , the frequency of each signal may be changed in each transmitting/receiving circuit 1 to 10.
以上説明した通り、本発明による地中配電線事
故区分装置によれば、事故捜査器の事故情報を各
開閉器間で伝送することによつて各開閉器を開閉
制御するようにしたため、事故点投入を行わない
で事故区分することができ、安定性を高めること
ができる。 As explained above, according to the underground distribution line accident classification device according to the present invention, since the accident information of the accident investigation device is transmitted between each switch to control the opening and closing of each switch, the accident point Accidents can be categorized without injection, improving stability.
第１図は本発明の一実施例を示す説明図。第２
図はキヤビネツトの開閉器の開閉制御用回路を示
すブロツク図。第３図は本発明における信号伝送
ラインを示す説明図。
符号の説明、１〜１０……送受信回路、２０…
…事故捜査器、２１……バツテリ、２２，２３…
…制御回路、２４，２５……ゲート回路、Ｓ，S0
……多回路開閉器、S11，S12，S21，S22，S31，
S32，S41，S42……開閉器、C1，C2，C3，C4……
キヤビネツト、L1，L2，L3，L4，L5……地中配
電線。
FIG. 1 is an explanatory diagram showing one embodiment of the present invention. Second
The figure is a block diagram showing a circuit for controlling opening and closing of a switch of a cabinet. FIG. 3 is an explanatory diagram showing a signal transmission line in the present invention. Explanation of symbols, 1 to 10... Transmitting/receiving circuit, 20...
...Accident investigation device, 21...Battery, 22, 23...
...Control circuit, 24, 25...Gate circuit, S, S 0
...Multi-circuit switch, S 11 , S 12 , S 21 , S 22 , S 31 ,
S 32 , S 41 , S 42 ... Switch, C 1 , C 2 , C 3 , C 4 ...
Cabinet, L1 , L2 , L3 , L4 , L5 ...Underground distribution line.
Claims (1)
故を検出したとき事故点の位置に応じた事故信号
を出力する複数の事故捜査器と、 前記各キヤビネツトに設けられ、前記事故信号
を隣接するキヤビネツトとの間で送受信する複数
の送受信回路と、 前記各キヤビネツトに設けられ、前記送受信回
路を介して入力した前記事故信号に応じて開閉器
を投入し、あるいはロツクする制御回路と、 事故を検出したとき前記地中電線路を電源側で
遮断する遮断手段を備え、 前記遮断手段が事故発生によつて前記地中電線
路を遮断したとき、前記各キヤビネツトの前記送
受信回路が負荷側に隣接して位置する隣接キヤビ
ネツトの前記送受信回路から前記隣接キヤビネツ
トの負荷側線路の前記事故信号を受信し、前記制
御回路が前記負荷側線路に事故が有るとき前記隣
接キヤビネツトの電源側のキヤビネツトの開閉器
を投入し、前記負荷側線路に事故が無いとき前記
電源側のキヤビネツトの開閉器をロツクすること
により事故点投入しないで事故区分することを特
徴とする地中配電線事故区分装置。 ２ 前記送受信回路が、地中電線路のシース層を
相間接続して構成した閉ループ回路を介して前記
事故信号を送受信する構成の特許請求の範囲第１
項記載の地中配電線事故区分装置。[Scope of Claims] 1. A plurality of accident investigation devices provided in each cabinet of the underground power line and outputting an accident signal according to the position of the fault point when an accident is detected; a plurality of transmitting/receiving circuits for transmitting and receiving fault signals between adjacent cabinets; and a control circuit provided in each of the cabinets for closing or locking a switch in response to the fault signal input via the transmitting/receiving circuits. and a cutoff means for cutting off the underground power line on the power supply side when an accident is detected, and when the cutoff means cuts off the underground power line due to the occurrence of an accident, the transmission/reception circuit of each of the cabinets The fault signal on the load side line of the adjacent cabinet is received from the transmitting/receiving circuit of the adjacent cabinet located adjacent to the load side, and when there is a fault on the load side line, the control circuit receives the fault signal on the power side of the adjacent cabinet. An underground distribution line accident classification device characterized in that the fault is classified without turning on the fault point by closing the switch of the cabinet and locking the switch of the cabinet on the power supply side when there is no fault on the load side line. . 2. Claim 1, wherein the transmitting/receiving circuit transmits and receives the accident signal via a closed loop circuit configured by interconnecting sheath layers of underground power lines.
Underground distribution line fault classification device described in Section 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11021681A JPS5812533A (en) | 1981-07-15 | 1981-07-15 | Underground wiring line defect sorting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11021681A JPS5812533A (en) | 1981-07-15 | 1981-07-15 | Underground wiring line defect sorting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5812533A JPS5812533A (en) | 1983-01-24 |
| JPH0241255B2 true JPH0241255B2 (en) | 1990-09-17 |
Family
ID=14530006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11021681A Granted JPS5812533A (en) | 1981-07-15 | 1981-07-15 | Underground wiring line defect sorting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5812533A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6485528A (en) * | 1987-09-25 | 1989-03-30 | Togami Electric Mfg | Distribution line accident section detecting and separating system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5931285B2 (en) * | 1976-09-16 | 1984-08-01 | 東京電力株式会社 | Accident point classification method |
-
1981
- 1981-07-15 JP JP11021681A patent/JPS5812533A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5812533A (en) | 1983-01-24 |
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