JPS63213409A - Protective relay - Google Patents
Protective relayInfo
- Publication number
- JPS63213409A JPS63213409A JP62043079A JP4307987A JPS63213409A JP S63213409 A JPS63213409 A JP S63213409A JP 62043079 A JP62043079 A JP 62043079A JP 4307987 A JP4307987 A JP 4307987A JP S63213409 A JPS63213409 A JP S63213409A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- protective relay
- relay device
- output
- accident
- 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.)
- Granted
Links
- 230000001681 protective effect Effects 0.000 title claims description 15
- 238000001514 detection method Methods 0.000 claims description 24
- 238000009434 installation Methods 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、電力系統での事故を検出した時必要に応じ
て遮断指令を出力する保護継電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 protective relay device that outputs a shutdown command as necessary when an accident in an electric power system is detected.
第２図は例えば、雑誌電気協同研究、第３７巻。 For example, Figure 2 is from the magazine Electric Kyodo Research, Vol. 37.
第１号に示された従来の距離継電装置の至近端短絡事故
時の極性電圧メモリ消滅対策例を示す回路構成図であり
、図において、１ａは過電流要素５１が動作したことに
より閉成する出力接点、２はモー特性距離方向判定要素
４４Ｍが動作したことにより閉成する出力接点、３ばリ
アクタンス特性距離方向判定要素４４Ｘ１が動作したこ
とにより閉成する出力接点、４と５は上記過電流要素５
１．２種類の距離方向判定要素４４Ｍ、４４Ｘ１の出力
をＡＮＤ構成した出力接点１ａ、２．３が閉成されたこ
とによ多動作する自己保持回路４と遮断指令出力回路５
．４１はリレー、Ｔ５はタイマーである。It is a circuit configuration diagram showing an example of a countermeasure against polarity voltage memory disappearance in the event of a short-circuit accident in the conventional distance relay device shown in No. 1. In the figure, 1a is closed due to the operation of overcurrent element 2 is an output contact that closes when the Moh characteristic distance direction determining element 44M operates, 3 is an output contact that closes when the reactance characteristic distance direction determining element 44X1 operates, 4 and 5 are the above-mentioned output contacts. Overcurrent element 5
1. A self-holding circuit 4 and a cutoff command output circuit 5 that operate multiple times when the output contacts 1a and 2.3, which are configured by ANDing the outputs of two types of distance direction determination elements 44M and 44X1, are closed.
．． 41 is a relay, and T5 is a timer.
次に動作について説明する。まず、電力系統に事故が発
生すると、過電流要素５１が動作して、出力接点１ａが
閉成する。事故が距離継電装置の保護区間内部で発生し
ていれば、２種類の距離方向判定要素４４Ｍ、４４Ｘ１
が動作し夫々の出力接点２．３が閉成する。上記過電流
要素５１．２種類の距離方向判定要素４４Ｍ、４４Ｘｌ
の各々の出力接点１ａ、２．３が閉成したことによりリ
レー４１が作動してモー特性距離方向判定要素４４Ｍの
出力接点２をバイパスさせる自己保持回路４が形成され
る。同時にタイマーＴ５が動作して遮断指令出力回路５
が動作し、瞬時動作あるいは限時動作を伴った遮断指令
が出力され、保護区間の遮断が行われる。Next, the operation will be explained. First, when an accident occurs in the power system, the overcurrent element 51 operates and the output contact 1a is closed. If the accident occurs within the protection zone of the distance relay device, two types of distance direction determination elements 44M and 44X1
operates and the respective output contacts 2.3 are closed. Above-mentioned overcurrent element 51. Two types of distance direction determination elements 44M, 44Xl
When the respective output contacts 1a and 2.3 are closed, the relay 41 is activated, and a self-holding circuit 4 is formed that bypasses the output contact 2 of the moor characteristic distance direction determining element 44M. At the same time, the timer T5 operates and the cutoff command output circuit 5
operates, a shutdown command with instantaneous or time-limited operation is output, and the protection zone is shut off.
ところで、モー特性距離方向判定要素４４Ｍは、電力系
統の電圧を極性電圧に使用しているので、電力系統の電
圧が零、あるいは非常に小さくなる様な距離継電装置の
保護区間内部の至近端事故に対しては動作出来なくなる
ため、極性電圧メモリ回路を有し、極性電圧が零、ある
いは非常に小さくても動作出来るように一般には回路構
成されている。限時動作勿伴った限時遮断の場合にはタ
イマーＴ５の限時動作が完了する前に電力系統の′電圧
が零あるいは非常に小さくなるような事故が発生してい
れば、極性電圧メモリ回路が消滅するためモー特性距離
方向判定要素４４Ｍが復帰し出力接点２は開放されるが
、上記自己保持回路４により出力接点２がバイパスされ
ているため、限時動作は継続され遮断指令が出力される
。By the way, the Moh characteristic distance direction determining element 44M uses the voltage of the power grid as the polarity voltage, so if the voltage of the power grid is zero or very small, it is necessary to Since the device cannot operate in the event of an accident, the circuit is generally configured to include a polarity voltage memory circuit and to be able to operate even if the polarity voltage is zero or very small. In the case of a timed shutdown accompanied by a timed operation, if an accident occurs in which the voltage of the power system becomes zero or extremely small before the timed operation of timer T5 is completed, the polarity voltage memory circuit will disappear. Therefore, the motor characteristic distance direction determining element 44M returns and the output contact 2 is opened, but since the output contact 2 is bypassed by the self-holding circuit 4, the time-limited operation continues and a cutoff command is output.
従来の保護継電装置は以上のように構成されているので
、計器用変圧器（線路ＰＤ）を使用している場合、第１
回目遮断後の再開路前には過電流要素、距離方向判定要
素、自己保持回路及び遮断指令出力回路は復帰している
。この状態において、距離継電装置の保護区間内部の至
近端に短絡等事故が残留していればモー特性距離方向判
定要素の極性電圧メモリ回路はすでに消−滅しておシ、
モー特性距離方向判定要素は動作しないので再遮断が出
来なくなる等の問題点があった。Conventional protective relay devices are configured as described above, so when using a potential transformer (line PD), the first
The overcurrent element, distance direction determination element, self-holding circuit, and cutoff command output circuit have been restored before the circuit is restarted after the second cutoff. In this state, if an accident such as a short circuit remains at the closest end inside the protection zone of the distance relay device, the polarity voltage memory circuit of the moor characteristic distance direction determination element will have already disappeared.
Since the Moo characteristic distance direction determining element does not operate, there are problems such as the inability to shut off the system again.
この発明は上記のような問題点を解決するためになされ
たもので、距離継電装置の保護区間の再閉路後にモー特
性距離方向判定要素が動作不能となる至近端事故に対し
ても遮断指令を出力することが出来る保護継電装置を得
ることを目的とする。This invention was made in order to solve the above-mentioned problems, and it can also be used to shut off even in the case of a near-end accident in which the maw characteristic distance direction determining element becomes inoperable after the protection zone of the distance relay device is reclosed. The purpose is to obtain a protective relay device that can output commands.
この発明に係る保護継電装置は、電力系統において事故
が発生したことを検出する事故検出要素、遮断指令が出
力されたことを保持する遮断指令保持回路、保護区間内
部の至近端事故を検出する至近端事故検出要素、保護区
間第１回目遮断後の再閉路装置からの再閉路信号を受信
し、かつ保持する再閉路信号受信回路によ！ｌｌ構成し
たものである。The protective relay device according to the present invention includes an accident detection element that detects the occurrence of an accident in a power system, a disconnection command holding circuit that maintains that a disconnection command has been output, and a close-end accident detection inside a protection zone. The close-end accident detection element receives and holds the re-closing signal from the re-closing device after the first interruption of the protection zone! It is composed of ll.
この発明における事故検出要素は過電流要素などによっ
て構成され、電力系統に事故が発生していることを検出
する。遮断指令保持回路（タイマーＴ１の常閉接点）は
距離方向判定要素などによる遮断指令を再閉路時間以上
継続させることにより再閉路前の継電装置の動作状態を
保持する。至近端事故検出要素は不足電圧要素などによ
シ構成され、モー特性距離方向判定要素などの電力系統
の電圧を極性電圧に使用しているため、至近端事故時に
不動作になることがあるような要素の不動作範囲を検出
する。再閉路信号受信回路は再閉路装置からの再閉路指
令を受信し、かつ再閉路指令が短時間であっても確実な
動作が出来るように限時復帰を持たせ再閉路が実施され
たことを検出する。The accident detection element in this invention is constituted by an overcurrent element, etc., and detects the occurrence of an accident in the power system. The cut-off command holding circuit (normally closed contact of timer T1) maintains the operating state of the relay device before re-closing by continuing the cut-off command by the distance direction determining element or the like for the re-closing time or more. The near-end fault detection element is composed of an undervoltage element, etc., and uses the voltage of the power system, such as the Moh characteristic distance direction determination element, as the polarity voltage, so it is unlikely to become inoperable in the event of a near-end fault. Detect the inactive range of such an element. The reclosing signal receiving circuit receives the reclosing command from the reclosing device, and detects that reclosing has been performed by providing a timed return so that reliable operation can be performed even if the reclosing command is short. do.
〔実施例〕
以下、この発明の一実施例を図について説明する。図中
、第２図と同一の部分は同一の符号をもって図示した第
１図において、１ｂは事故検出要素５１Ｂが動作したこ
とによシ閉成する出力接点で、この例においては、例え
ば、出力接点１ａと同じ過電流要素５１により閉成する
出力接点、Ｔ１はタイマーで、６はそのタイマーＴ１の
常閉接点Ｔ１ｂによって構成されリレー４１とタイマー
Ｔ５と同じく出力接点１ａ、２．３が閉成されたことに
より動作し、再閉路時間以上継電装置の動作状態を保持
する遮断指令保持回路、７はモー特性距離方向判定要素
４４Ｍが不動作となる保護区間内部の至近端事故を検出
する至近端事故検出要素２７が動作したことによシ閉成
する出力接点で、この例においては不足電圧要素によシ
閉成する出力接点、Ｔ２はタイマーで常開接点Ｔ２ａを
有する。[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, the same parts as in FIG. 2 are indicated with the same reference numerals. In FIG. An output contact that is closed by the same overcurrent element 51 as the contact 1a, T1 is a timer, 6 is a normally closed contact T1b of the timer T1, and the output contact 1a, 2.3 is closed like the relay 41 and timer T5. 7 detects a near-end accident inside the protection zone in which the motor characteristic distance direction determining element 44M becomes inoperable. T2 is an output contact that closes when the near-end fault detection element 27 operates, and in this example, an output contact that closes due to an undervoltage element. T2 is a timer and has a normally open contact T2a.
８は再閉路装置からの再閉路条件５２Ｃを受信し、かつ
再閉路後の再遮断が出来るようにタイマーＴ２により限
時動作を持たせた再閉路信号受信回路、Ｔ３はタイマー
で常開接点Ｔ３ａを有する。９は上記事故検出要素５１
Ｂ、至近端事故検出要素２７、遮断指令保持回路６、再
閉路信号受信回路８の出力をＡＮＤ構成した出力接点１
ｂ、Ｔｉｂ、７゜Ｔ２ａが閉成したことによシ動作する
再遮断指令出力回路である。8 is a re-closing signal receiving circuit which receives the re-closing condition 52C from the re-closing device and has a time-limited operation using a timer T2 so that the circuit can be cut off again after the re-closing, and T3 is a timer that connects the normally open contact T3a. have 9 is the accident detection element 51 mentioned above.
B. Output contact 1 configured by ANDing the outputs of the nearest end fault detection element 27, the cutoff command holding circuit 6, and the reclosing signal receiving circuit 8.
This is a re-shutoff command output circuit that operates when T2a, Tib, and Tb are closed.
次に動作について説明する。まず、電力系統に事故が発
生すると、まず、過電流要素５１が動作して出力接点１
ａ、ｉｂが閉成する。事故が距離継電装置の保護区間内
部で発生していれば、２種類の距離方向判定要素４４Ｍ
、４４Ｘ１が動作し、出力接点２，３が閉成する。上記
過電流要素５１、距離方向判定要素４４Ｍ、４４Ｘ１の
各々の出力接点１ａ 、２．３が閉成したことによりモ
ー特性距離方向判定要素４４Ｍの出力接点２をバイパス
させる自己保持回路４が形成されると同時ンζタイマー
Ｔ５が動作して遮断指令出力回路５が閉成し遮断指令が
出力され、距離継電装置の保護区間の第１回目遮断が行
われる。そして再閉路装置により再閉路が行われるｌで
の無電圧時間の間は、線 −路ＰＤを使用している場合
距離綿′屯装置に電力系統の電圧が印加されないため、
モー特性距離方向判定要素４４Ｍの極性電圧メモリ回路
は消滅する。Next, the operation will be explained. First, when an accident occurs in the power system, the overcurrent element 51 operates and the output contact 1
a and ib close. If the accident occurs within the protection zone of the distance relay device, two types of distance direction determination elements 44M
, 44X1 are operated, and output contacts 2 and 3 are closed. When the output contacts 1a and 2.3 of the overcurrent element 51 and the distance direction determination elements 44M and 44X1 are closed, a self-holding circuit 4 is formed that bypasses the output contact 2 of the motor characteristic distance direction determination element 44M. At the same time, the ζ timer T5 operates, the cutoff command output circuit 5 is closed, a cutoff command is output, and the protection zone of the distance relay device is cut off for the first time. During the no-voltage time at 1 when the reclosing device performs reclosing, the power system voltage is not applied to the distance control device when line PD is used.
The polarity voltage memory circuit of the Moh characteristic distance direction determining element 44M disappears.
また、保護区間が遮断されているため過電流要素５１、
リアクタンス距離方向判定要素４４Ｘ１は復帰する。再
閉路後、保護区間内部の至近端に事故が残留していると
過電流要素５１、リアクタンス特性距離方向判定要素４
４Ｘ１は動作し出力接点１ａ、１ｂ、３は再び閉成する
が、モー特性距離方向判定要素４４Ｍは至近端事故のた
め極性電圧が零か、あるいは非常に小さく、また極性電
圧メモリ回路が消滅しているため不動作となり出力接点
２は開放のままである。出力接点２が開放しているため
自己保持回路４、遮断指令出力回路５は動作しないが遮
断指令保持回路６は上記第１回目遮断時に動作している
ためその常閉接点は閉成された′１まである。さらに再
閉路装置からの再閉路条件５２Ｃを受信したことによ９
再閉路信号受信回路８が動作しその常開接点Ｔ２ａが閉
成する。In addition, since the protection zone is cut off, the overcurrent element 51,
The reactance distance direction determining element 44X1 returns. After re-closing, if the fault remains at the closest end inside the protection zone, the overcurrent element 51 and the reactance characteristic distance direction determination element 4 are activated.
4X1 operates and the output contacts 1a, 1b, and 3 are closed again, but the polarity voltage of the Moh characteristic distance direction determining element 44M is zero or very small due to a close end accident, and the polarity voltage memory circuit disappears. Therefore, it is inoperative and the output contact 2 remains open. Since the output contact 2 is open, the self-holding circuit 4 and the cutoff command output circuit 5 do not operate, but the cutoff command holding circuit 6 is operated at the time of the first cutoff, so its normally closed contact is closed. There are up to 1. Furthermore, due to receiving the reclosing condition 52C from the reclosing device, 9
The reclosing signal receiving circuit 8 operates and its normally open contact T2a is closed.
この時故障が至近端に残留していると、至近端検出要素
２７が動作して出力接点７が閉成する。即ち、上記事故
検出要素５１Ｂ、つまり過電流要素５１及び至近端事故
検出要素２７の出力接点１ｂ。If the fault remains at the proximal end at this time, the proximal end detection element 27 operates and the output contact 7 closes. That is, the output contact 1b of the fault detection element 51B, that is, the overcurrent element 51 and the closest end fault detection element 27.
７が閉成し、かつ遮断指令保持回路６、タイマーＴ２の
常開接点Ｔ２ａが動作していることからタイマーＴ３が
動作し再遮断指令出力回路９が動作して遮断指令が出力
され保膿区間の再遮断が行われる。7 is closed, and the shutoff command holding circuit 6 and the normally open contact T2a of the timer T2 are operating, so the timer T3 is activated, the re-shutoff command output circuit 9 is activated, a shutoff command is output, and the purulent preservation period is started. will be re-blocked.
なお、上記実施例では事故検出要素５１Ｂに出力接点１
ｂを設けたものを示したが、過電流要素５１の出力接点
１ａと共用にして設けてもよい。In addition, in the above embodiment, the output contact 1 is connected to the accident detection element 51B.
b is shown, but it may also be provided in common with the output contact 1a of the overcurrent element 51.
筐た、事故検出要素５１Ｂの出力接点１ｂに過電流要素
５１を設けたものを示したが、電力系統の電圧、電流を
入力量として用い、モー特性距離方向判定要素４４Ｍの
ように極性電圧メモリのようなメモリ効果が必要でなく
事故を検出出来る要素を設けてもよい。Although the overcurrent element 51 is provided at the output contact 1b of the accident detection element 51B, the voltage and current of the electric power system are used as input quantities, and the polarity voltage memory is used as in the motor characteristic distance direction determination element 44M. It is also possible to provide an element capable of detecting an accident without requiring a memory effect such as the above.
また、事故検出要素５１Ｂの出力接点１ｂ、至近端事故
検出要素２７の出力接点７を個別に設けたものを示した
が、事故検出要素５１Ｂの出力接点１ｂと至近端事故検
出要素２７の出力接点７とを１つの至近端事故検出要素
２７の出力接点Ｔとして設けてもよい。In addition, although the output contact 1b of the accident detection element 51B and the output contact 7 of the nearest end accident detection element 27 are individually provided, the output contact 1b of the accident detection element 51B and the output contact 7 of the nearest end accident detection element 27 The output contact 7 may be provided as the output contact T of one nearest-end accident detection element 27.
また、遮断指令出力回路５と再遮断指令出力回路９を個
別に設けたものを示したが、遮断指令出力回路５への動
作指令と再遮断指令出力回路９への動作指令との論理和
を取ったものを遮断指令出力回路５に印加し、遮断指令
出力回路５と再遮断指令出力回路９を１つにして設けて
もよい。In addition, although the circuit in which the shutdown command output circuit 5 and the re-shutdown command output circuit 9 are provided separately is shown, the logical sum of the operation command to the shutdown command output circuit 5 and the operation command to the re-shutdown command output circuit 9 is The obtained signal may be applied to the cut-off command output circuit 5, and the cut-off command output circuit 5 and the re-shutoff command output circuit 9 may be combined into one.
以上のようにこの発明によれば、保護継電装置を事故検
出要素、至近端事故検出要素、遮断指令保持回路、再閉
路信号受信回路の出力信号によシ動作するよう回路構成
したので、動作条件が保護区間内部の至近端事故の残留
に対してのみ成立するため不要遮断の心配がなく、かつ
高速度に遮断指令が出力できる効果がある。As described above, according to the present invention, the protective relay device is configured to operate based on the output signals of the accident detection element, the nearest end accident detection element, the cutoff command holding circuit, and the reclosing signal reception circuit. Since the operating condition is established only for the residual near-end accident inside the protection zone, there is no need to worry about unnecessary shutoffs, and the shutoff command can be outputted at high speed.
第１図はこの発明の一実施例による保護継電装置の回路
構成図、第２図は従来の保護継電装置の回路構成図であ
る。
図において、５１は過電流要素、５１Ｂは事故検出要素
、４４Ｍはモー特性距離方向判定要素、４４Ｘ１はリア
クタンス特性距離方向判定要素、５は遮断指令出力回路
、６は遮断指令保持回路、２７は至近端事故検出要素、
８は再閉路信号受信回路、９は再遮断指令出力回路であ
る。
第１図
５、逗断椙＋出力０路
６ ： 逮断才昌仮呆↑１画路
８：再閉路信号受信回路
９： 再遮断指令出力回路
第２図
手続補正書（自発）FIG. 1 is a circuit diagram of a protective relay device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional protective relay device. In the figure, 51 is an overcurrent element, 51B is an accident detection element, 44M is a motor characteristic distance direction determination element, 44X1 is a reactance characteristic distance direction determination element, 5 is a cutoff command output circuit, 6 is a cutoff command holding circuit, and 27 is a cutoff command holding circuit. Near-end accident detection element,
8 is a re-closing signal receiving circuit, and 9 is a re-closing command output circuit. Fig. 1 5, Shut-off + Output 0 path 6: Arrest Saisho provisional ↑ 1 path 8: Re-closing signal receiving circuit 9: Re-shut-off command output circuit Fig. 2 Procedure amendment (voluntary)
Claims (3)
遮断指令を出力して系統を遮断し電力系統の保護をする
保護継電装置において、前記電力系統に事故が発生した
ことを検出する事故検出要素と、上記遮断指令を保持す
る遮断指令保持回路と、上記保護継電装置設置点の至近
端の事故を検出する至近端事故検出要素と、系統保護区
間の遮断後、再閉路装置からの再閉路信号を受信して保
持する再閉路信号受信回路とを備え、上記系統保護区間
の再閉路後、事故が保護継電装置設置点の至近端に残留
している場合、該電力系統に遮断指令を出力することを
特徴とする保護継電装置。(1) In a protective relay device that protects the power system by outputting a shutdown command as necessary when an accident is detected in the power system, the occurrence of an accident in the power system is detected. A fault detection element that detects a fault at the nearest end of the protective relay device installation point, a cutoff command holding circuit that holds the cutoff command, a near-end fault detection element that detects a fault at the nearest end of the protective relay installation point, and a cutoff command holding circuit that holds the cutoff command. and a reclosing signal receiving circuit that receives and holds a reclosing signal from the circuit closing device, and if an accident remains at the end closest to the protective relay device installation point after the system protection section is reclosed, A protective relay device characterized in that it outputs a cutoff command to the power system.
つて構成したことを特徴とする特許請求の範囲第１項記
載の保護継電装置。(2) The protective relay device according to claim 1, wherein the cutoff command holding circuit is constituted by a normally closed contact of a timer.
接点によつて構成したことを特徴とする特許請求の範囲
第１項記載の保護継電装置。(3) The protective relay device according to claim 1, wherein the output of the reclosing signal receiving circuit is constituted by a normally closed contact of a timer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62043079A JPH0636648B2 (en) | 1987-02-27 | 1987-02-27 | Protective relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62043079A JPH0636648B2 (en) | 1987-02-27 | 1987-02-27 | Protective relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63213409A true JPS63213409A (en) | 1988-09-06 |
| JPH0636648B2 JPH0636648B2 (en) | 1994-05-11 |
Family
ID=12653835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62043079A Expired - Lifetime JPH0636648B2 (en) | 1987-02-27 | 1987-02-27 | Protective relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636648B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02123913A (en) * | 1988-10-31 | 1990-05-11 | Mitsubishi Electric Corp | Protective relay |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57139237U (en) * | 1981-02-23 | 1982-08-31 |
-
1987
- 1987-02-27 JP JP62043079A patent/JPH0636648B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57139237U (en) * | 1981-02-23 | 1982-08-31 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02123913A (en) * | 1988-10-31 | 1990-05-11 | Mitsubishi Electric Corp | Protective relay |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0636648B2 (en) | 1994-05-11 |
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