JPS62261978A - Monitoring device for operation characteristic of switching equipment - Google Patents
Monitoring device for operation characteristic of switching equipmentInfo
- Publication number
- JPS62261978A JPS62261978A JP61104848A JP10484886A JPS62261978A JP S62261978 A JPS62261978 A JP S62261978A JP 61104848 A JP61104848 A JP 61104848A JP 10484886 A JP10484886 A JP 10484886A JP S62261978 A JPS62261978 A JP S62261978A
- Authority
- JP
- Japan
- Prior art keywords
- operating
- command current
- operation command
- time
- monitoring device
- 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
- 238000012806 monitoring device Methods 0.000 title claims description 13
- 239000000284 extract Substances 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 12
- 230000001133 acceleration Effects 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000035939 shock Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、開閉機器例えば遮断器などの動作特性の異
常を検出する監視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 monitoring device for detecting an abnormality in the operating characteristics of a switching device, such as a circuit breaker.
第４図は例えば特願昭５９−２３０８４５号に開示され
た開閉機器および従来の開閉機器動作特性監視装置を示
す構成図およびブロック図、そして第５図は動作指令電
流に比例した電流センサ出力を示す波形図である。図に
おいて、（りは監視対象となる開閉機器例えば遮断器、
（２）はこの遮断器（１）のため操作力を発生する操作
装置例えば操作シリンダ、（３）はこれら遮断器（１）
と操作シリンダ（２）を連結する操作ロッド、（４）は
操作シリンダ（２）に取り付けられて操作シリンダ（２
）への操作油（図示しない）の流入を制御する制御バル
ブ、（５）はこの制御バルブ（４）を制御する制御部材
、（６）は動作指令コイルであって、動作指令電流の流
通によって制御部材（５）を駆動する。（７）は動作指
令電流と電磁的に結合した電流センサ、（８）はこの電
流センサ（７）の出力する電圧信号を増幅器（９）に導
びく信号線、（１０）は増幅器（９）からのパルス信号
の時間幅を計測するタイマ、そして゛＜１１）はこのタ
イマ（１０）によって計測された時間幅より遮断器（１
）の動作特性の異常の有無を判定する判定器である。Fig. 4 shows a configuration diagram and a block diagram showing a switchgear disclosed in Japanese Patent Application No. 59-230845 and a conventional switchgear operating characteristic monitoring device, and Fig. 5 shows a current sensor output proportional to the operation command current. FIG. In the figure, (ri is the switchgear to be monitored, such as a circuit breaker,
(2) is an operating device that generates an operating force for this circuit breaker (1), such as an operating cylinder, and (3) is an operating device that generates operating force for this circuit breaker (1).
An operating rod (4) is attached to the operating cylinder (2) and connects the operating cylinder (2) to the operating cylinder (2).
), (5) is a control member that controls this control valve (4), and (6) is an operation command coil, which is controlled by the flow of operation command current. Drive the control member (5). (7) is a current sensor that is electromagnetically coupled to the operation command current, (8) is a signal line that leads the voltage signal output from this current sensor (7) to an amplifier (9), and (10) is an amplifier (9). A timer that measures the time width of the pulse signal from the circuit breaker (10), and ゛<11
) is a determining device that determines whether there is an abnormality in the operating characteristics of the device.
従来の開閉機器動作特性監視装置は上述したように構成
されてぷり、遮断器（１）を動作させるために動作指令
コイル（６）へ動作指令電流を流すと、動作指令コイル
（６）が制御部材（５）を駆動する。そして制御バルブ
（４）、操作シリンダ（２）および操作ロッド（３）を
介して遮断器（１）の操作が行われる。このとき動作指
令電流が遮断器（１）に付属する補助接点（図示しない
）によって切られるので、動作指令電流のパルス幅は遮
断器（１）の動作特性を反映したものであることがよく
知られている。電流センサ（７）は、この動作指令電流
と鎖交するように設けられた電流検出装置であり、動作
指令コイル（６）に流通する動作指令電流１こ比例した
電圧信号を得ることが出来る。このとき電流センサ（７
）の出力として得られる電圧信号（動作指令電流に比例
する）の−例は第５図に示すとおりである。この電圧信
号を信号線（８）を通して増幅器（９）に導きかつ増幅
した後に時間幅を測定するタイマ（１０）に導びくこと
により、動作指令コイル（６）に流れた動作指令電流の
時間幅を測定することができる。第５図において、ＴＴ
は測定された時間を示す。さらに、この時間幅ＴＴの値
を判定器（１１）に入力することにより、判定器（１１
）は遮断器（１）の動作特性が正常か異常かの判定を行
うことが出来る。The conventional switchgear operating characteristic monitoring device is configured as described above, and when an operation command current is applied to the operation command coil (6) in order to operate the circuit breaker (1), the operation command coil (6) is controlled. Drive member (5). The circuit breaker (1) is then operated via the control valve (4), the operating cylinder (2) and the operating rod (3). At this time, the operating command current is cut off by an auxiliary contact (not shown) attached to the circuit breaker (1), so it is well known that the pulse width of the operating command current reflects the operating characteristics of the circuit breaker (1). It is being The current sensor (7) is a current detection device provided so as to be interlinked with this operation command current, and can obtain a voltage signal proportional to the operation command current flowing through the operation command coil (6). At this time, the current sensor (7
An example of the voltage signal (proportional to the operation command current) obtained as the output of the motor is shown in FIG. This voltage signal is led to the amplifier (9) through the signal line (8), and after being amplified, is led to the timer (10) that measures the time width, thereby generating the time width of the operation command current flowing through the operation command coil (6). can be measured. In Figure 5, TT
indicates the measured time. Furthermore, by inputting the value of this time width TT to the determiner (11),
) can determine whether the operating characteristics of the circuit breaker (1) are normal or abnormal.
従来の開閉機器動作特性監視装置は以上のように動作指
令電流のみを測定することによって遮断器（１）の動作
特性を監視するので、Ｒ断器（１）の動作のうち、動作
指令電流を切る補助接点が開くまでしか監視の対象とな
らない。ところが、実際の遮断器（１）においては動作
指令電流が切れた後でも引き続いて遮断器（１）の可動
部分が動き、さらに動きが停止する過程が続くのに、こ
の部分の動作特性については監視することが出来ないと
いう問題点があった。The conventional switchgear operating characteristic monitoring device monitors the operating characteristics of the circuit breaker (1) by measuring only the operation command current as described above, so the operation command current is not included in the operation of the R circuit breaker (1). Monitoring is only performed until the auxiliary contact to disconnect opens. However, in the actual circuit breaker (1), the movable part of the circuit breaker (1) continues to move even after the operation command current is cut off, and the process of stopping the movement continues, but the operating characteristics of this part are unclear. There was a problem that it could not be monitored.
この発明は上述したような問題点を解決するためになさ
れたもので、遮断器動作の全過程についての監視を可能
にし、特に遮断器機構の動きはじめおよび制動などの特
性監視にとって重要な部分の監視が行いやすい開閉機器
動作特性監視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 makes it possible to monitor the entire process of circuit breaker operation, especially the important parts for monitoring the characteristics of the circuit breaker mechanism, such as the start of operation and braking. The purpose of the present invention is to obtain a switching equipment operating characteristic monitoring device that is easy to monitor.
この発明に係る開閉機器動作特性監視装置は、従来と同
様の動作指令電流パルス時間幅を測定する手段に加えて
、動作開始時や制動時に発生する特に大きな振動加速度
を検出する振動センサと、この振動センサの検出信号か
ら高周波成分のみを取り出すハイパスフィルタと、前記
時間幅および前記検出信号から時間遅れを測定するタイ
マと、開閉機器の動作特性の正常、異常を判定する判定
器とを設けたものである。The switching equipment operating characteristic monitoring device according to the present invention includes, in addition to conventional means for measuring the operation command current pulse time width, a vibration sensor that detects particularly large vibration acceleration that occurs at the start of operation or during braking; A device equipped with a high-pass filter that extracts only high-frequency components from the detection signal of the vibration sensor, a timer that measures the time width and time delay from the detection signal, and a determiner that determines whether the operating characteristics of the switching equipment are normal or abnormal. It is.
この発明では遮断器の操作シリンダなどの駆動力発生源
に振動センサを取り付けて振動加速度を検出し、この振
動加速度検出信号から特に周波数の高い成分をハイパス
フィルタで取り出し、この検出信号より所定の設定レベ
ルを上まわるパルスの、動作指令開始時からの時間遅れ
を測定することにより、遮断器動作の全過程における特
性を把握することができる。In this invention, a vibration sensor is attached to a driving force generation source such as an operation cylinder of a circuit breaker to detect vibration acceleration, a high-frequency component is extracted from this vibration acceleration detection signal using a high-pass filter, and a predetermined setting is determined from this detection signal. By measuring the time delay of the pulse exceeding the level from the start of the operation command, it is possible to understand the characteristics of the entire process of circuit breaker operation.
以下、この発明の一実施例を第１図および第２図につい
て説明する。第１図は開閉機器およびこの発明の開閉機
器動作特性監視装置を示す構成図およびブロック図であ
り、図中（１）〜（９）は第４図に示したものと同じで
あって、この部分は動作指令電流に対応する電圧パルス
を発生する部分を構成する。（３１）は操作シリンダ（
２）に取り付けられて動作開始時や制動時に発生する振
動加速度を検出する振動センサ、（３２）はこの振動セ
ンサ（３１）によって検出された信号を増幅する増幅器
、（３３）は増幅された検出信号中から特に周波数の高
い成分（３ｋＨｚ程度以上）を取り出すためのハイパス
フィルタ、（３りは動作指令電流パルスの時間幅の他に
動作指令開始時から振動加速度検出信号中に所定の設定
レベルを超えるパルスが発生するまでの時間遅れを測定
するタイマ、 （５５）はこれら時間幅および時間遅れ
などから遮断器（１）の動作特性の正常、異常を判定す
るための判定器である。An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. FIG. 1 is a configuration diagram and a block diagram showing a switchgear and a switchgear operating characteristic monitoring device of the present invention, in which (1) to (9) are the same as those shown in FIG. The portion constitutes a portion that generates a voltage pulse corresponding to the operation command current. (31) is the operating cylinder (
2) is a vibration sensor that is attached to detect vibration acceleration that occurs at the start of operation or during braking, (32) is an amplifier that amplifies the signal detected by this vibration sensor (31), and (33) is an amplified detection A high-pass filter is used to extract particularly high frequency components (approximately 3 kHz or higher) from the signal. (3) In addition to the time width of the operation command current pulse, a predetermined setting level is applied to the vibration acceleration detection signal from the start of the operation command. A timer (55) that measures the time delay until the generation of a pulse that exceeds the threshold value is a determining device that determines whether the operating characteristics of the circuit breaker (1) are normal or abnormal based on the time width and time delay.
上述したように構成された開閉機器動作特性監視装置は
、動作指令電流の供給によって計測を開始すると共に、
この時点と振動センサ（３１）が感じる振動に関する情
報のうち特に動作開始時や制動時に多く発生する高周波
成分の加速度のうちの大きい成分との間の時間遅れが正
常な動作では大略一定に保たれる特性を利用したもので
ある。すなわち、動作指令電流が動作指令コイル（６）
に流されると、遮断器（１）の操作装置が付勢されて遮
断器動作が開始する。このとき衝撃的に力がかかるため
に操作シリンダ（２）に高周波の振動が発生する。また
、動作が完了する時点付近でも動きを停止するためのダ
ッシュポットの動作などが別の高周波振動を発生させる
。このようにして振動センサ（３１）の検出信号には高
い周波数の成分が何度か現われる。この検出信号からハ
イパスフィルタ（３３）によって必要成分を取り出し、
動作指令電圧信号と共にタイマ（３４）に入力すること
で遅れ時間’ｒｓ、’ｒθが測定される。このようにし
て動作全過程についての時間関係が把握され、これに基
づいて判定器（３５）が正常、異常の判定をする。The switchgear operating characteristic monitoring device configured as described above starts measurement by supplying an operation command current, and
The time delay between this point and the large component of the high-frequency component of acceleration, which occurs frequently at the start of operation or during braking, among the information about the vibration felt by the vibration sensor (31), remains approximately constant during normal operation. This method takes advantage of the characteristics of In other words, the operation command current is the operation command coil (6).
When the flow occurs, the operating device of the circuit breaker (1) is energized and circuit breaker operation begins. At this time, high-frequency vibrations are generated in the operation cylinder (2) due to the impact force applied thereto. In addition, the operation of the dashpot to stop the movement near the point where the movement is completed generates other high-frequency vibrations. In this way, high frequency components appear several times in the detection signal of the vibration sensor (31). A high-pass filter (33) extracts the necessary components from this detection signal,
The delay times 'rs and 'rθ are measured by inputting them to the timer (34) together with the operation command voltage signal. In this way, the time relationship for the entire operation process is grasped, and based on this, the determiner (35) determines whether the operation is normal or abnormal.
上記実施例においては、遮断器の駆動力源が操作シリン
ダの場合を想定し、操作シリンダに振動センサを取り付
けたが、例えばバネ操作方式の場合などは、操作シリン
ダと等価な部品として第３図に示すように駆動力を中継
するレバー（２人）の軸受部などに振動センサを取り付
けることによって同等の効果を得ることが出来る。In the above embodiment, it is assumed that the driving force source of the circuit breaker is the operation cylinder, and a vibration sensor is attached to the operation cylinder. However, in the case of a spring operation type, for example, the vibration sensor is installed as a component equivalent to the operation cylinder as shown in Fig. 3. The same effect can be obtained by attaching a vibration sensor to the bearing part of the lever (two people) that relays the driving force, as shown in the figure.
尚、本実施例は遮断器を例に取って説明したが断路器な
ど他の開閉機器にも同様に適用できる。Although this embodiment has been described using a circuit breaker as an example, it can be similarly applied to other switching devices such as a disconnector.
以上のように、この発明によれば、動作指令電流に比例
した電圧信号の時間幅を測定する手段に加えて、動作手
段の振動を検出する振動センサと、この振動センサの検
出信号から高周波成分のみを取り出すハイパスフィルタ
と、前記電圧信号および前記検出信号から時間遅れを測
定するタイマと。As described above, according to the present invention, in addition to the means for measuring the time width of the voltage signal proportional to the operation command current, there is also provided a vibration sensor for detecting the vibration of the operation means, and a high-frequency component from the detection signal of the vibration sensor. a high-pass filter that extracts only the voltage signal; and a timer that measures the time delay from the voltage signal and the detection signal.
前記電圧信号の時間幅および測定された時間遅れから遮
断器の動作特性の正常、異常を判定する判定器とを設け
たので、遮断器の動作の全時間帯に亘って確実な監視が
できるという効果がある。The system is equipped with a determiner that determines whether the circuit breaker's operating characteristics are normal or abnormal based on the time width of the voltage signal and the measured time delay, making it possible to reliably monitor the circuit breaker's operation over the entire time period. effective.
第１図は開閉機器およびこの発明の一実施例を示す構成
図およびブロック図、第２図はこの発明の動作説明用波
形図、第３図はこの発明が適用される別な構成を示す図
、第４図は開閉機器および従来の開閉機器動作特性監視
装置を示す構成図およびブロック図、第５図は動作指令
電流を示す波形図である。
図において、（１）は遮断器、（２）は操作シリンダ、
（２人）はレバー、（７）は電流センサ、（３１）は振
動センサ、（３５）ハハイパスフィルタ、 （３４）は
タイマ、（３５）は判定器である。
なお、図中、同一符号は同一、又は相当部分を示す。
２ 、 判御イ′Ｆシリ一ダ
７ ・ 電麦で一す
３１ ゛ 仮勧ｔ−ブ
罵２図
ＰＩＥ）３図
２Ａ ： Ｌ／で−Fig. 1 is a configuration diagram and block diagram showing a switching device and an embodiment of this invention, Fig. 2 is a waveform diagram for explaining the operation of this invention, and Fig. 3 is a diagram showing another configuration to which this invention is applied. , FIG. 4 is a configuration diagram and a block diagram showing a switching device and a conventional switching device operating characteristic monitoring device, and FIG. 5 is a waveform diagram showing an operation command current. In the figure, (1) is a circuit breaker, (2) is an operating cylinder,
(2) is a lever, (7) is a current sensor, (31) is a vibration sensor, (35) is a high-pass filter, (34) is a timer, and (35) is a judge. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. 2. 3. Figure 2A: L/De-
Claims (4)
給される動作指令電流に比例した電圧信号の時間幅を測
定する手段と、前記動作手段中の駆動力源に取り付けら
れ振動加速度を検出する振動センサと、この振動センサ
の検出信号から高周波成分のみを取り出すハイパスフィ
ルタと、動作指令開始時から前記ハイパスフィルタより
の出力信号パルスが得られるまでの時間遅れを測定する
タイマと、計測された時間幅および時間遅れから開閉機
器動作特性の正常、異常を判定する判定器とを備えたこ
とを特徴とする開閉機器動作特性監視装置。(1) A means for operating the switching device, a means for measuring the time width of a voltage signal proportional to the operation command current supplied to the operating means, and a means attached to the driving force source in the operating means to detect vibration acceleration. a high-pass filter that extracts only high-frequency components from the detection signal of the vibration sensor, a timer that measures the time delay from the start of an operation command until the output signal pulse from the high-pass filter is obtained; 1. A switchgear operating characteristic monitoring device comprising: a determiner that determines whether the switchgear operating characteristics are normal or abnormal based on a time width and a time delay.
とする特許請求の範囲第１項記載の開閉機器動作特性監
視装置。(2) The switching device operating characteristic monitoring device according to claim 1, wherein the switching device is a circuit breaker or a disconnector.
ダに振動センサが取り付けられることを特徴とする特許
請求の範囲第１項または第２項記載の開閉機器動作特性
監視装置。(3) The operating characteristic monitoring device for opening/closing equipment according to claim 1 or 2, wherein the operating means includes an operating cylinder, and a vibration sensor is attached to the operating cylinder.
み、このレバーの軸受部に振動センサが取り付けられる
ことを特徴とする特許請求の範囲第１項または第２項記
載の開閉機器動作特性監視装置。(4) Operating characteristics of the opening/closing device according to claim 1 or 2, wherein the operating means includes a spring-operated driving force relay lever, and a vibration sensor is attached to the bearing of this lever. monitoring equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61104848A JPS62261978A (en) | 1986-05-09 | 1986-05-09 | Monitoring device for operation characteristic of switching equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61104848A JPS62261978A (en) | 1986-05-09 | 1986-05-09 | Monitoring device for operation characteristic of switching equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62261978A true JPS62261978A (en) | 1987-11-14 |
Family
ID=14391732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61104848A Pending JPS62261978A (en) | 1986-05-09 | 1986-05-09 | Monitoring device for operation characteristic of switching equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62261978A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6430128A (en) * | 1987-07-24 | 1989-02-01 | Toshiba Corp | Detecting device for control signal for switching equipment |
| JPH0749362A (en) * | 1988-05-16 | 1995-02-21 | Hitachi Ltd | Abnormality diagnostic system for high voltage power equipment |
| JP2009148117A (en) * | 2007-12-17 | 2009-07-02 | Kanto Denki Hoan Kyokai | Device for measuring circuit breaker operation time |
| JP2013019874A (en) * | 2011-07-14 | 2013-01-31 | Chugoku Electric Power Co Inc:The | Bearing diagnosis device and bearing diagnosis method |
| JP2014053162A (en) * | 2012-09-07 | 2014-03-20 | Railway Technical Research Institute | Breaker operation state determination apparatus and breaker operation state determination method |
| CN105353302A (en) * | 2015-11-20 | 2016-02-24 | 清华大学 | Switch equipment arcing time detection device and switch equipment arcing time detection method |
| WO2022110963A1 (en) * | 2020-11-27 | 2022-06-02 | 国网冀北电力有限公司电力科学研究院 | Rapid mechanical switch test system and method of high-voltage direct-current circuit breaker |
-
1986
- 1986-05-09 JP JP61104848A patent/JPS62261978A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6430128A (en) * | 1987-07-24 | 1989-02-01 | Toshiba Corp | Detecting device for control signal for switching equipment |
| JPH0749362A (en) * | 1988-05-16 | 1995-02-21 | Hitachi Ltd | Abnormality diagnostic system for high voltage power equipment |
| JP2009148117A (en) * | 2007-12-17 | 2009-07-02 | Kanto Denki Hoan Kyokai | Device for measuring circuit breaker operation time |
| JP2013019874A (en) * | 2011-07-14 | 2013-01-31 | Chugoku Electric Power Co Inc:The | Bearing diagnosis device and bearing diagnosis method |
| JP2014053162A (en) * | 2012-09-07 | 2014-03-20 | Railway Technical Research Institute | Breaker operation state determination apparatus and breaker operation state determination method |
| CN105353302A (en) * | 2015-11-20 | 2016-02-24 | 清华大学 | Switch equipment arcing time detection device and switch equipment arcing time detection method |
| CN105353302B (en) * | 2015-11-20 | 2018-05-15 | 深圳供电局有限公司 | The detection method of switchgear arc time |
| WO2022110963A1 (en) * | 2020-11-27 | 2022-06-02 | 国网冀北电力有限公司电力科学研究院 | Rapid mechanical switch test system and method of high-voltage direct-current circuit breaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5188812B2 (en) | Method and apparatus for operating switchgear safely | |
| RU2297065C2 (en) | Method for evaluating wear of power switch contacts | |
| KR101932287B1 (en) | Method for diagnosing an operating state of a contactor and contactor for implementing said method | |
| US6017017A (en) | Process and apparatus for the recognition of the state of a solenoid valve | |
| US8545139B2 (en) | Magnetic drilling stand with holding force monitoring | |
| JP5656831B2 (en) | Rail brake monitoring method | |
| KR920701687A (en) | Compressor controller and method | |
| JP5240167B2 (en) | Switch diagnosis method and switch diagnosis device | |
| JPH1092283A (en) | Contactor operation monitoring method | |
| US9287064B2 (en) | Switching device and method for detecting malfunctioning of such a switching device | |
| JPS62261978A (en) | Monitoring device for operation characteristic of switching equipment | |
| US5204633A (en) | Electromagnetic contactor with closure fault indicator | |
| JPH09240936A (en) | Elevator control device | |
| US5747984A (en) | Switching component for detecting contact erosion | |
| CN112630654A (en) | Band-type brake detection system and method | |
| JP2004123270A (en) | Failure diagnosis device for elevator electromagnetic brake | |
| US20220187372A1 (en) | Method for predicting the failure of elementary relays | |
| JP3061500B2 (en) | Elevator electromagnetic brake operation state detection device | |
| JPS6457056A (en) | Refrigeration cycle device | |
| RU2054192C1 (en) | Method for control of electromagnetic relay supplied by direct current | |
| ITTO970405A1 (en) | PROCEDURE AND DEVICE FOR AUTOMATIC SURVEILLANCE OF Leakage CURRENT PROTECTION SWITCHES. | |
| EP3892580A1 (en) | Electronic safety actuator for an elevator safety brake and method of detecting position of an electronic safety actuator | |
| JPH01232628A (en) | Abnormal opening/closing sensing device for breaker | |
| JP2728994B2 (en) | Switching device operation abnormality detection device | |
| RU1775746C (en) | Electromagnetic relay wear resistance predictive nondestructive testing method |