JPH07123334B2 - Bubble protector - Google Patents
Bubble protectorInfo
- Publication number
- JPH07123334B2 JPH07123334B2 JP61286071A JP28607186A JPH07123334B2 JP H07123334 B2 JPH07123334 B2 JP H07123334B2 JP 61286071 A JP61286071 A JP 61286071A JP 28607186 A JP28607186 A JP 28607186A JP H07123334 B2 JPH07123334 B2 JP H07123334B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- frequency
- current
- ground
- bubble
- 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
Links
Landscapes
- Protection Of Generators And Motors (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、電動機により駆動されるポンプにより液槽の
中に液体と共に気泡を吹き込むようにした気泡風呂など
の気泡装置の電気回路の感電事故に対して人体を安全に
保護する気泡装置の保護装置に関するものである。The present invention relates to an electric shock accident in an electric circuit of a bubble device such as a bubble bath in which bubbles are blown together with liquid into a liquid tank by a pump driven by an electric motor. The present invention relates to a protective device for a bubble device that safely protects a human body.
従来、気泡装置として例えば気泡風呂装置においては第
２図又は第３図の如く、感電事故を防止するため、一般
家庭に供給される電源１と、電動機２を駆動するための
電源とを変圧器３又はアースに接続するセンタータップ
付きの変圧器４を介して絶縁してしている。５は漏電遮
断器、６はマグネットにより操作される電磁開閉器であ
る。2. Description of the Related Art Conventionally, for example, in a bubble bath device as a bubble bath device, as shown in FIG. 2 or 3, a transformer is provided with a power source 1 supplied to a general household and a power source for driving an electric motor 2 in order to prevent an electric shock accident. 3 or via a transformer 4 with a center tap connected to the ground. Reference numeral 5 is an earth leakage breaker, and 6 is an electromagnetic switch operated by a magnet.
しかしながら、このような従来のものにおいては、変圧
器の絶縁が劣化すると感電の危険を生じ、さらに電動機
が漏電している場合に、使用者又は保守者が変圧器の２
次側に触れると保護装置がないため危険度の高い感電事
故を招くおそれがあった。また電動機に接地線を接続し
て地絡しても、接地線が切断していたり接触不良により
大きな抵抗を示すようになったときには地絡による安全
を保つことができず感電事故を招く危険があった。However, in such a conventional device, if insulation of the transformer is deteriorated, there is a risk of electric shock, and if the electric motor is leaked, the user or the maintenance person may not
Touching the next side could lead to a high-risk electric shock accident because there is no protective device. Even if the ground wire is connected to the electric motor, if the ground wire is cut or if a large contact resistance causes a large resistance, it is not possible to maintain safety due to a ground fault and there is a risk of electric shock. there were.
また、ポンプの空転を防止するために、外部にフロート
スイッチや圧力スイッチ又は電極等のセンサを配備し、
保護を行っていたが、このような電気的センサは絶縁破
壊した場合感電事故を招く危険があった。In addition, in order to prevent the idling of the pump, a sensor such as a float switch, a pressure switch or an electrode is provided outside,
Although protection was provided, such an electric sensor had a risk of causing an electric shock accident when dielectric breakdown occurred.
本発明は、従来のものの上記の如き問題点を解決し、変
圧器による絶縁を行わず、地絡による安全を確保し、ま
た、ポンプの空転を防ぐのに対しても感電事故の危険を
防ぐことができる気泡装置の保護装置を提供することを
目的とする。The present invention solves the above-mentioned problems of the conventional ones, does not perform insulation by a transformer, secures safety due to a ground fault, and prevents the idling of the pump, and also prevents the risk of electric shock. An object of the present invention is to provide a protection device for a bubble device that can be used.
本発明は、電源から動力回路を経て駆動され、接地線を
設けた電動機により運転されるポンプにより液槽の中に
液体と共に気泡を吹き込むようにした気泡装置の電気回
路の安全を保護する気泡装置の保護装置において、前記
接地線を経てアースに流す微弱な高周波電流を発生する
高周波発振回路と、該接地線を経て流れた高周波電流を
前記電源の接地から前記動力回路上を搬送せしめ、高域
フィルタにて該高周波電流を取り出す高周波伝送回路
と、該高域フィルタにて取り出された高周波電流の電圧
を検出する高周波電圧検出回路と、前記電動機の運転電
流を変流器を介して検出する運転電流検出回路と、前記
高周波電圧又は前記運転電流が、それぞれに対して予め
設定された設定値よりも小となった場合に、前記電動機
の動力回路を遮断する非常遮断回路とを備えたことを特
徴とする気泡装置の保護装置を提供せんとするものであ
る。The present invention relates to a bubble device which protects the safety of an electric circuit of a bubble device in which bubbles are blown together with liquid into a liquid tank by a pump driven by a power source through a power circuit and driven by an electric motor provided with a ground wire. In the protection device, a high-frequency oscillator circuit for generating a weak high-frequency current flowing through the ground wire to the ground, and a high-frequency current flowing through the ground wire are conveyed from the ground of the power source to the power circuit, and a high frequency band is generated. A high-frequency transmission circuit that extracts the high-frequency current with a filter, a high-frequency voltage detection circuit that detects the voltage of the high-frequency current extracted with the high-pass filter, and an operation that detects the operating current of the electric motor through a current transformer. When the current detection circuit and the high frequency voltage or the operating current become smaller than the preset value for each, the power circuit of the electric motor is shut off. There is provided St. protection device of the bubble device is characterized in that a emergency shut-off circuit.
本発明は、上記の如く構成されており、動力回路に変圧
器を用いていないので装置が小型になる上変圧器の絶縁
不良による事故を避けることができ、電動機の運転中の
みならず停止中も含めて常時接地導通を監視しているの
で接地不良に基づく感電事故を防ぎ、接地抵抗が大或い
は無限大である状態のときに人が触れても微弱な高周波
電流が流れるだけなので人体に危険はなく、また、ポン
プケーシング内に空気が入る場合などに生ずる空転の有
無を検知するのに、電気回路に対し非接触の変流器によ
り電流を検出することにより行っているので、フロート
スイッチ、圧力スイッチ、電極などを用いた空転検知方
式におけるが如き絶縁破壊による感電のおそれがなく、
感電事故に対して人体を安全に保護することができる。INDUSTRIAL APPLICABILITY The present invention is configured as described above, and since the transformer is not used in the power circuit, the device becomes smaller, and an accident due to poor insulation of the transformer can be avoided, and the motor is not only operating but also stopped. Since the ground continuity is constantly monitored including the one, it prevents an electric shock accident due to a ground failure, and even if a person touches it when the ground resistance is large or infinite, only a weak high-frequency current flows, which is dangerous to the human body. In addition, in order to detect the presence or absence of idling that occurs when air enters the pump casing, it is performed by detecting the current with a non-contact current transformer to the electric circuit. There is no risk of electric shock due to insulation breakdown as in the slip detection method using pressure switches, electrodes, etc.
The human body can be safely protected against electric shock.
本発明の実施例を図面を用いて説明する。 Embodiments of the present invention will be described with reference to the drawings.
第１図において気泡装置のポンプ７を駆動する電動機８
は、片側を接地線９により接地された電源10により動力
回路15を介して駆動される。11は制御盤であり、電動機
８の動力回路には漏電遮断器12及び、電磁コイル14の励
磁により閉となる電磁接触器13が設けられている。In FIG. 1, an electric motor 8 for driving the pump 7 of the bubble device.
Is driven via a power circuit 15 by a power supply 10 whose one side is grounded by a grounding wire 9. Reference numeral 11 denotes a control panel, and a power circuit of the electric motor 8 is provided with an earth leakage breaker 12 and an electromagnetic contactor 13 which is closed by exciting the electromagnetic coil 14.
11Aは制御基板であり、以下に示す回路を収容してい
る。17は安定化電源回路であり、漏電遮断器12の２次側
の動力回路15から温度ヒューズ内蔵型の変圧器16を介し
て接続され、他の諸回路に電力を供給する。11A is a control board, which houses the circuits shown below. Reference numeral 17 denotes a stabilized power supply circuit, which is connected from a power circuit 15 on the secondary side of the earth leakage breaker 12 via a transformer 16 having a built-in temperature fuse to supply electric power to other circuits.
18は動力回路15に組み合わされた変流器であり、動力回
路15に対し非接触にて運転電流値に対応する信号を出力
する。19は運転電流検出回路であり運転電流値信号をポ
ンプ運転制御回路20の比較回路21に入力せしめる。Reference numeral 18 is a current transformer combined with the power circuit 15, and outputs a signal corresponding to the operating current value to the power circuit 15 in a non-contact manner. Reference numeral 19 denotes an operating current detection circuit for inputting an operating current value signal to the comparison circuit 21 of the pump operation control circuit 20.
22は高周波発振回路であり、例えば50KHz程度の高周波
微弱電流を発生する。電動機８は高周波発振回路22と、
アース23とにそれぞれ導線24及び接地線25により接続さ
れ、発生した微弱な高周波電流は導線24と接地線25を経
てアース23に流れるようになっている。A high-frequency oscillator circuit 22 generates a high-frequency weak current of, for example, about 50 KHz. The electric motor 8 has a high-frequency oscillator circuit 22,
The ground wire 23 is connected to the ground wire 23 by a conductor wire 24 and a ground wire 25, respectively, and the generated weak high-frequency current flows through the wire wire 24 and the ground wire 25 to the ground wire 23.
動力回路15から分岐する安定化電源回路17用の分岐回路
26の途中に高域フィルタ27（ハイパスフィルタ）が設け
られ、分岐回路26に搬送されている高周波電流を高域フ
ィルタ27により取り出して、その電圧を高周波電圧検出
回路28により検出し、ポンプ運転制御回路20の比較回路
21にその信号を入力するようになっている。Branch circuit for stabilized power supply circuit 17 that branches from power circuit 15
A high-pass filter 27 (high-pass filter) is provided in the middle of 26, the high-frequency current carried to the branch circuit 26 is taken out by the high-pass filter 27, and the voltage is detected by the high-frequency voltage detection circuit 28 to control the pump operation. Comparison circuit of circuit 20
The signal is input to 21.
従って、高周波発振回路22にて発生した微弱高周波電流
は、電動機８の接地線25を経てアース23に導かれ、アー
ス29より接地線９を経て動力回路15、分岐回路26上を搬
送され、高域フィルタ27にて取り出され、高周波電圧検
出回路28に至る。即ち接地線９、動力回路15、分岐回路
26、高域フィルタ27により高周波伝送回路を形成してい
る。Therefore, the weak high-frequency current generated in the high-frequency oscillation circuit 22 is guided to the ground 23 via the ground wire 25 of the electric motor 8 and is conveyed from the ground 29 via the ground wire 9 to the power circuit 15 and the branch circuit 26, and the It is taken out by the bandpass filter 27 and reaches the high frequency voltage detection circuit 28. That is, ground line 9, power circuit 15, branch circuit
The high-pass filter 26 and the high-pass filter 27 form a high-frequency transmission circuit.
31は設定値回路であり、高周波電圧設定値及び運転電流
設定値を設定し、その信号を比較回路21に入力する。Reference numeral 31 is a set value circuit, which sets a high frequency voltage set value and an operating current set value, and inputs the signal to the comparison circuit 21.
比較回路21においては、高周波電圧及び運転電流をそれ
ぞれの設定値と比較し、設定値以下となった場合に異常
を示す異常信号を発する。即ち、高周波電圧に対して
は、高周波検出電圧が、高周波電流発生時の電圧より、
通常の回路抵抗及び通常の接地抵抗（100Ω程度）に相
当する電圧を差引いた電圧を設定値とし、この設定値よ
りも高周波検出電圧が低くなった場合（接地線25が切断
するか外れたような場合に示される電圧ゼロとなる場合
も含む）に異常信号が発せられるようになっている。運
転電流に対しては、運転中にケーシング中に気泡が発生
し揚水不能となったり、呼び水がない様な状態のときに
示される、定格電流よりも低い所定の電流値を設定値と
し、この設定値よりも運転電流が低くなつたときに異常
信号が発せられるようになっている。In the comparison circuit 21, the high frequency voltage and the operating current are compared with their respective set values, and when the values are below the set values, an abnormal signal indicating an abnormality is issued. That is, for the high frequency voltage, the high frequency detection voltage is
When the set value is the voltage obtained by subtracting the voltage corresponding to the normal circuit resistance and the normal ground resistance (about 100Ω), when the high frequency detection voltage becomes lower than this set value (the ground wire 25 may be disconnected or disconnected) An abnormal signal is generated when the voltage becomes zero, which is indicated in such a case. For the operating current, set a predetermined current value lower than the rated current, which is indicated when there is no priming due to bubbles being generated in the casing during operation, or when there is no priming. An abnormal signal is issued when the operating current becomes lower than the set value.
33はポンプ運転用の電磁接触器13への指令回路であり、
比較回路21からの異常信号が指令回路33に入力されるよ
うになっている。異常信号の入力に対応する指令回路33
の出力によりＢ接点34が開かれ、電磁コイル35が非励磁
となり、運転状態にあることを示す運転ランプ36が消え
る。33 is a command circuit to the electromagnetic contactor 13 for pump operation,
An abnormal signal from the comparison circuit 21 is input to the command circuit 33. Command circuit 33 corresponding to abnormal signal input
Output, the B contact 34 is opened, the electromagnetic coil 35 is de-energized, and the operation lamp 36 indicating that it is in operation is extinguished.
37は電磁コイル35の励磁により閉となるＡ接点である。37 is an A contact which is closed by the excitation of the electromagnetic coil 35.
38は浴室スイッチ、39は浴室スイッチ開閉判定回路であ
る。38 is a bathroom switch, and 39 is a bathroom switch open / close determination circuit.
動作につき説明する。The operation will be described.
最初に、電動機８の接地不良の場合について述べる。First, the case where the electric motor 8 is not properly grounded will be described.
先ず、浴室スイッチ38がオンされていない、電動機８の
停止状態における監視動作につき述べる。First, the monitoring operation when the bathroom switch 38 is not turned on and the electric motor 8 is stopped will be described.
接地線25が切断したり、外れたりして導通がない場合、
或いは接触不良、接地状態の不良により接地抵抗が異常
に高い場合には、高周波電流が流れないか或いは極めて
微弱な電流となる。従って高周波電流による高周波検出
電圧もゼロ或いは微小となり設定値以下となり、比較回
路21より異常信号が持続して出力され、Ｂ接点34が開と
なったままで電磁コイル35及び電磁コイル14は非励磁状
態を保ち、電磁接触器13は投入されず開かれたままであ
り、動力回路15は遮断されたまま保たれ、浴室スイッチ
38をオンしても、電動機８は起動せず、安全を保つ。即
ち運転タイマー32、指令回路33、Ｂ接点34、電磁コイル
35、Ａ接点37、電磁コイル14、電磁接触器13により異常
信号により動力回路15を遮断する非常遮断回路を形成し
ている。If the ground wire 25 is cut or disconnected and there is no continuity,
Alternatively, when the ground resistance is abnormally high due to a poor contact or a poor grounding condition, the high frequency current does not flow or becomes an extremely weak current. Therefore, the high-frequency detection voltage due to the high-frequency current becomes zero or minute and becomes less than the set value, and the abnormal signal is continuously output from the comparison circuit 21, and the B contact 34 remains open and the electromagnetic coils 35 and 14 are in the non-excited state. , The magnetic contactor 13 remains unopened and open, the power circuit 15 remains disconnected, and the bathroom switch
Even if 38 is turned on, the electric motor 8 does not start and the safety is maintained. That is, the operation timer 32, the command circuit 33, the B contact 34, the electromagnetic coil
The 35, the A contact 37, the electromagnetic coil 14, and the electromagnetic contactor 13 form an emergency shutoff circuit that shuts off the power circuit 15 by an abnormal signal.
次に、浴室スイッチ38がオンされ、電動機８が運転状態
にある場合の監視動作について述べる。Next, the monitoring operation when the bathroom switch 38 is turned on and the electric motor 8 is in the operating state will be described.
接地線25が切断したり、外れたりして導通がない場合、
或いは接触不良、接地状態の不良により接地抵抗が異常
に高い場合には、上述と同様の作用にて比較回路21より
異常信号が出力され、Ｂ接点34が開となり、電磁コイル
35が非励磁となり、Ａ接点37が開き、電磁コイル14が非
励磁となり、電磁接触器13が開き、動力回路が遮断され
電動機８が停止して安全を保つ。If the ground wire 25 is cut or disconnected and there is no continuity,
Alternatively, when the ground resistance is abnormally high due to a poor contact or a poor grounding condition, an abnormal signal is output from the comparison circuit 21 by the same operation as described above, the B contact 34 is opened, and the electromagnetic coil is opened.
35 is de-excited, the A contact 37 is opened, the electromagnetic coil 14 is de-excited, the electromagnetic contactor 13 is opened, the power circuit is cut off, and the electric motor 8 is stopped to maintain safety.
次に、気泡の混入や呼び水の不足などのためのポンプが
空転するような場合について述べれば、通常の運転時よ
りも低下した動力回路の電流値を変流器18により検出
し、運転電流検出回路19を経て比較回路21にて比較す
る。運転電流が設定値よりも低いことから比較回路21か
ら持続して異常信号が出力され、前述の高周波電流の場
合と同様の動作により、電磁接触器13が開き、動力回路
15が遮断されて安全を保つ。Next, to describe the case where the pump runs idle due to mixing of air bubbles or lack of priming, the current value of the power circuit that is lower than that during normal operation is detected by the current transformer 18, and the operating current is detected. The comparison is performed by the comparison circuit 21 via the circuit 19. Since the operating current is lower than the set value, an abnormal signal is continuously output from the comparison circuit 21, and by the same operation as in the case of the high frequency current described above, the electromagnetic contactor 13 opens and the power circuit
15 is cut off and keeps safety.
本発明により、気泡装置の感電事故の危険を防止するた
めの、動力回路に変圧器を用いず、装置が小型になり、
変圧器の絶縁不良に伴う事故を避け、電動機の運転中の
みならず停止中も含めて常時接地状態を監視しているの
で接地不良に基づく感電事故を常時防止し、ポンプ内に
気泡が入ったり、呼び水不足の場合などのポンプ空転を
変流器による電流検出で、動力回路に非接触で行ってい
るので感電の危険を防ぎ、人体に対し安全を確保する気
泡装置の保護装置を提供することができ、実用上極めて
大なる効果を奏する。According to the present invention, in order to prevent the risk of electric shock accidents of the bubble device, without using a transformer in the power circuit, the device becomes smaller,
Avoiding accidents due to poor insulation of the transformer and constantly monitoring the grounding status not only when the motor is running but also when it is stopped, so it is possible to prevent electric shock accidents due to poor grounding and prevent bubbles from entering the pump. In order to prevent the risk of electric shock and protect the human body by providing a protective device for the bubble device, the current flowing through the current transformer is used to detect the idling of the pump when there is a shortage of priming water without contacting the power circuit. It is possible to achieve an extremely large effect in practical use.
第１図は本発明の実施例の回路図、第２図及び第３図は
従来例の回路図である。 １……電源、２……電動機、３……変圧器、４……変圧
器、５……漏電遮断器、６……電磁開閉器、７……ポン
プ、８……電動機、９……接地線、10……電源、11……
制御盤、11A……制御基板、12……漏電遮断器、13……
電磁接触器、14……電磁コイル、15……動力回路、16…
…変圧器、17……安定化電源回路、18……変流器、19…
…運転電流検出回路、20……ポンプ運転制御回路、21…
…比較回路、22……高周波発振回路、23……アース、24
……導線、25……接地線、26……分岐回路、27……高域
フィルタ、28……高周波電圧検出回路、29……アース、
31……設定値回路、33……指令回路、34……Ｂ接点、35
……電磁コイル、36……運転ランプ、37……Ａ接点、38
……浴室スイッチ、39……浴室スイッチ開閉判定回路。FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIGS. 2 and 3 are circuit diagrams of a conventional example. 1 ... Power supply, 2 ... Motor, 3 ... Transformer, 4 ... Transformer, 5 ... Leakage breaker, 6 ... Electromagnetic switch, 7 ... Pump, 8 ... Electric motor, 9 ... Ground Line, 10 …… power supply, 11 ……
Control panel, 11A ... Control board, 12 ... Earth leakage breaker, 13 ...
Electromagnetic contactor, 14 ... electromagnetic coil, 15 ... power circuit, 16 ...
… Transformer, 17 …… Stabilized power supply circuit, 18 …… Current transformer, 19…
… Operating current detection circuit, 20… Pump operation control circuit, 21…
… Comparison circuit, 22 …… High frequency oscillation circuit, 23 …… Ground, 24
...... Conductor, 25 …… Ground wire, 26 …… Branch circuit, 27 …… High-pass filter, 28 …… High frequency voltage detection circuit, 29 …… Ground,
31 …… Set value circuit, 33 …… Command circuit, 34 …… B contact, 35
...... Electromagnetic coil, 36 ...... Run lamp, 37 ...... A contact, 38
…… Bathroom switch, 39 …… Bathroom switch open / closed judgment circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 広田 郁夫 東京都中央区銀座１丁目３番１号 株式会 社荏原電産内 (56)参考文献 特開 昭55−106032（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikuo Hirota 1-3-1 Ginza, Chuo-ku, Tokyo Ebara Densan Co., Ltd. (56) References JP-A-55-106032 (JP, A)
Claims (1)
を設けた電動機により運転されるポンプにより液槽の中
に液体と共に気泡を吹き込むようにした気泡装置の電気
回路の安全を保護する気泡装置の保護装置において、 前記接地線を経てアースに流す微弱な高周波電流を発生
する高周波発振回路と、 該接地線を経て流れた高周波電流を前記電源の接地から
前記動力回路上を搬送せしめ、高域フィルタにて該高周
波電流を取り出す高周波伝送回路と、該高域フィルタに
て取り出された高周波電流の電圧を検出する高周波電圧
検出回路と、 前記電動機の運転電流を変流器を介して検出する運転電
流検出回路と、 前記高周波電圧又は前記運転電流が、それぞれに対して
予め設定された設定値よりも小となった場合に、前記電
動機の動力回路を遮断する非常遮断回路と を備えたことを特徴とする気泡装置の保護装置。1. A bubble for protecting the safety of an electric circuit of a bubble device, wherein a bubble is blown together with a liquid into a liquid tank by a pump driven by a power supply through a power circuit and driven by an electric motor provided with a ground wire. In a device protection device, a high-frequency oscillator circuit that generates a weak high-frequency current that flows to the ground through the ground wire, and a high-frequency current that flows through the ground wire are carried from the ground of the power supply to the power circuit, High-frequency transmission circuit for extracting the high-frequency current with a high-pass filter, high-frequency voltage detection circuit for detecting the voltage of the high-frequency current with the high-pass filter, and operating current of the electric motor through a current transformer When the operating current detection circuit and the high-frequency voltage or the operating current become smaller than the preset value for each, the power circuit of the electric motor is shut off. A protective device for an air bubble device, which is provided with an emergency shutoff circuit for shutting off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61286071A JPH07123334B2 (en) | 1986-12-02 | 1986-12-02 | Bubble protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61286071A JPH07123334B2 (en) | 1986-12-02 | 1986-12-02 | Bubble protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63140621A JPS63140621A (en) | 1988-06-13 |
| JPH07123334B2 true JPH07123334B2 (en) | 1995-12-25 |
Family
ID=17699575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61286071A Expired - Lifetime JPH07123334B2 (en) | 1986-12-02 | 1986-12-02 | Bubble protector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07123334B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180078990A (en) * | 2016-12-30 | 2018-07-10 | 화남전자 주식회사 | Control Structure and Method for Preventing Motor Stop from a Electric Motor Overload of Construction Equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5510632A (en) * | 1978-07-07 | 1980-01-25 | Haruo Miwa | Medal examiner and medal |
| JPS55106032A (en) * | 1979-02-08 | 1980-08-14 | Meidensha Electric Mfg Co Ltd | Field winding grounddfault protecting relay system |
-
1986
- 1986-12-02 JP JP61286071A patent/JPH07123334B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180078990A (en) * | 2016-12-30 | 2018-07-10 | 화남전자 주식회사 | Control Structure and Method for Preventing Motor Stop from a Electric Motor Overload of Construction Equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63140621A (en) | 1988-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7400476B1 (en) | Safety device for prevention of electrical shocks | |
| KR101365398B1 (en) | Earthquake disaster prevention system built-in switchgear and control method thereof | |
| US4410924A (en) | Motor protection control circuit | |
| KR101576541B1 (en) | Power device and method to control safety the same | |
| KR101193145B1 (en) | Cabinet panel for prevention disaster of neutral line peculiar and control method thereof | |
| US5768077A (en) | Earthing wire disconnection detection apparatus and leakage detection apparatus having an earthing wire disconnection detection function conductor | |
| NO20005024D0 (en) | Procedure for switching off a power supply in a dangerous situation, as well as a corresponding security arrangement | |
| CN205487828U (en) | Motor car group security circuit allies oneself with locking control device | |
| JPH07123334B2 (en) | Bubble protector | |
| JP4035942B2 (en) | Insulation degradation sensor and insulation degradation detection device using this sensor | |
| CN101752830A (en) | Open-phase protection contactor | |
| CA3116434C (en) | A circuit interrupter for interrupting an electric current during fault conditions | |
| KR101208467B1 (en) | Cabinet panel for prevention disaster of neutral line peculiar and control method thereof | |
| JPH09182278A (en) | Earth leakage protector | |
| JP2000270463A (en) | Power supply system | |
| JP2000032651A (en) | Gas leakage alarm device with power supply breaker | |
| KR950009115B1 (en) | Leakage of electricity safety device of a washing machine | |
| CN216056306U (en) | Anti-creeping device for fire and water immersion | |
| CN111208420B (en) | Generator grounding switch state detection method and system based on signal injection | |
| CN216929578U (en) | Grounding detection protection device | |
| KR101395551B1 (en) | Cabinet panel for prevention disaster of abnormal voltage protection and method thereof | |
| KR101246886B1 (en) | Cabinet panel of built-in neutral line protection function | |
| CN218300925U (en) | Dry-type transformer control circuit | |
| KR100745835B1 (en) | Leakage current sensor type power off device | |
| CN205377274U (en) | 10 kilovolt line current protection anti fraud device |