JP3537563B2 - Electronic overcurrent trip device - Google Patents
Electronic overcurrent trip deviceInfo
- Publication number
- JP3537563B2 JP3537563B2 JP28204795A JP28204795A JP3537563B2 JP 3537563 B2 JP3537563 B2 JP 3537563B2 JP 28204795 A JP28204795 A JP 28204795A JP 28204795 A JP28204795 A JP 28204795A JP 3537563 B2 JP3537563 B2 JP 3537563B2
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- JP
- Japan
- Prior art keywords
- hall element
- reference current
- value
- current
- switching
- 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.)
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- Hall/Mr Elements (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は電子式過電流引外
し装置に関し、特に、電流センサとしてホール素子を使
用した電子式過電流引外し装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic overcurrent trip device, and more particularly to an electronic overcurrent trip device using a Hall element as a current sensor.
【０００２】[0002]
【従来の技術】近年、電気設備回路が複雑になってきた
のに伴い、回路遮断器にはより正確な過電流保護性能が
要求されてくるようになってきた。このため、最近の回
路遮断器には精度のよい電子式過電流引外し装置が設け
られるようになってきた。2. Description of the Related Art In recent years, as electric equipment circuits have become more complicated, circuit breakers have been required to have more accurate overcurrent protection performance. For this reason, recent circuit breakers have been provided with accurate electronic overcurrent trip devices.
【０００３】このような電子式過電流引外し装置は、電
流センサの出力を電子回路によって演算して所定の条件
において、回路遮断器の開閉接触部を開離させるトリッ
プ装置にトリップ信号を供給する。従来、電流センサと
しては、閉磁路を形成する鉄芯にコイルを巻装した変流
器を回路遮断器の主回路導体に取付けて用いるのが一般
的であった。しかし、このような変流器は、鉄芯および
コイルを含んでいるため、主回路の電流が大きくなると
鉄芯が磁気飽和し、主回路電流値に比例する２次出力が
得られないという問題点があった。In such an electronic overcurrent trip device, the output of a current sensor is calculated by an electronic circuit and a trip signal is supplied to a trip device for opening and closing a contact portion of a circuit breaker under predetermined conditions. . Conventionally, as a current sensor, a current transformer in which a coil is wound around an iron core forming a closed magnetic circuit is generally used by being attached to a main circuit conductor of a circuit breaker. However, since such a current transformer includes an iron core and a coil, when the current in the main circuit increases, the iron core is magnetically saturated, and a secondary output proportional to the main circuit current value cannot be obtained. There was a point.
【０００４】このような問題点を解決する方法として、
ホール素子を電流センサとして主回路導電部に近接して
設ける技術がある。ホール素子は、その電流端に電流を
供給しておくと、この供給電流値およびホール素子を透
過する磁束に比例した出力が発生するという半導体素子
である。したがって、供給電流を一定に保っておけば、
主回路電流に比例して発生する磁束に比例した出力がホ
ール素子から得られ、主回路の電流値を検知することが
できる。このホール素子の出力がＣＰＵや電子回路部品
を含む電子式過電流引外し装置に入力され、所定の演算
を行なって条件が満足すればトリップ信号が発生され
る。[0004] As a method of solving such a problem,
There is a technology in which a Hall element is provided as a current sensor in the vicinity of a main circuit conductive portion. The Hall element is a semiconductor element that, when a current is supplied to its current end, an output proportional to the supplied current value and the magnetic flux transmitted through the Hall element is generated. Therefore, if the supply current is kept constant,
An output proportional to the magnetic flux generated in proportion to the main circuit current is obtained from the Hall element, and the current value of the main circuit can be detected. The output of the Hall element is input to an electronic overcurrent trip device including a CPU and electronic circuit components, and a predetermined operation is performed to generate a trip signal if the conditions are satisfied.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このホ
ール素子を電流センサとして使用したときは、前述のご
とく磁気飽和する変流器によるセンサとは異なり、電流
が大きくなっても電流値に比例した出力を発生する。こ
のため、主回路電流値が極めて大きくなるとホール素子
の出力も極めて大きくなり、ホール素子自体やホール素
子の出力をＣＰＵに入力するための入力信号変換回路な
どの電子回路素子の使用可能限界を越えて使用される状
態となる。その結果、トリップ信号を正しく発生しない
ことがあり、また長時間この状態が継続すると、回路素
子が故障するという問題があった。However, when this Hall element is used as a current sensor, unlike a sensor using a current transformer that magnetically saturates as described above, the output is proportional to the current value even when the current increases. Occurs. For this reason, when the main circuit current value becomes extremely large, the output of the Hall element becomes extremely large, exceeding the usable limit of an electronic circuit element such as an input signal conversion circuit for inputting the output of the Hall element itself or the Hall element to the CPU. To be used. As a result, a trip signal may not be generated correctly, and if this state continues for a long time, there is a problem that a circuit element breaks down.
【０００６】それゆえに、この発明の主たる目的は、回
路遮断器に大電流が流れても、機能を損ねることなく精
度よく回路遮断器にトリップ信号を発生する電子式過電
流引外し装置を提供することである。SUMMARY OF THE INVENTION Accordingly, a main object of the present invention is to provide an electronic overcurrent trip device which accurately generates a trip signal to a circuit breaker without impairing its function even if a large current flows through the circuit breaker. That is.
【０００７】[0007]
【課題を解決するための手段】請求項１に係る発明は、
回路遮断器の主回路導電部に近接して設けられるホール
素子を電流センサとする電子式過電流引外し装置におい
て、ホール素子に第１の基準電流および第１の基準電流
より小さい第２の基準電流を切換信号に応じて選択的に
供給する電流電源と、ホール素子の出力を検知する検知
手段と、検知手段による検知値が所定値を越えたとき、
ホール素子に供給する基準電流を第１の基準電流から第
２の基準電流に切換えるための切換信号を発生するとと
もに、検知手段による検知値に基準電流の変化に応じた
補正を加える切換手段と、検知手段による検知値または
補正された検知値に応じて演算を行ない、予め定められ
た動作設定条件を満足したとき、回路遮断器にトリップ
信号を発生して主回路を遮断させる演算手段とを備えて
構成される。そして、この発明では、回路遮断器に大き
な電流が流れてホール素子の出力が所定値を越えたと
き、ホール素子に供給される基準電流を低下させてホー
ル素子の出力を低下させるようにしているため、ホール
素子自体や電子式過電流引外し装置の電子回路部品が正
しい精度を維持して動作させて劣化をさせることはな
い。Means for Solving the Problems According to claim 1 of the present invention,
In an electronic overcurrent trip device using a Hall element provided in proximity to a main circuit conductive portion of a circuit breaker as a current sensor, a first reference current and a second reference smaller than the first reference current are supplied to the Hall element. A current power supply for selectively supplying a current in response to a switching signal, a detecting means for detecting an output of the Hall element, and when a detection value by the detecting means exceeds a predetermined value,
Switching means for generating a switching signal for switching the reference current supplied to the Hall element from the first reference current to the second reference current, and for correcting a value detected by the detecting means in accordance with a change in the reference current; Calculating means for performing a calculation in accordance with the detection value detected by the detection means or the corrected detection value, and generating a trip signal to the circuit breaker to cut off the main circuit when a predetermined operation setting condition is satisfied. It is composed. According to the present invention, when a large current flows through the circuit breaker and the output of the Hall element exceeds a predetermined value, the reference current supplied to the Hall element is reduced to lower the output of the Hall element. Therefore, the Hall element itself and the electronic circuit components of the electronic overcurrent trip device do not deteriorate by operating while maintaining correct accuracy.
【０００８】請求項２に係る発明では、請求項１の発明
に加えて、検知手段による検知値が所定値を越えていな
い場合でも切換手段を動作させる監視指令手段と、監視
指令手段を動作させたときに基準電流の切換わり前後の
ホール素子の出力値を比較してその比較結果が所定の結
果と異なるとき警報信号を発する警報信号発生手段とが
新たに設けられる。In the invention according to claim 2, in addition to the invention according to claim 1, the monitoring command means for operating the switching means even when the detection value by the detecting means does not exceed the predetermined value, and operating the monitoring command means. In this case, an alarm signal generating means for comparing the output values of the Hall element before and after the switching of the reference current and issuing an alarm signal when the comparison result is different from the predetermined result is newly provided.
【０００９】[0009]
【発明の実施の形態】図１はこの発明の実施の形態の回
路遮断器の要部側面断面図である。図１において、回路
遮断器は端子２，３と、それぞれ端子２，３と接触する
接触子４，５と、接触子４，５と接離可能な可動接触子
６を含む主回路導電部と、可動接触子６を操作するその
一部が図示されている開閉機構７と、可動接触子６に近
接して回路遮断器１の固定部材に取付けられるホール素
子８とを含む。さらに、回路遮断器１はホール素子８の
出力に応じてトリップ信号を発生する電子式過電流引外
し装置９と、電子式過電流引外し装置９のトリップ信号
に応じて回路遮断器１を開閉機構７を動作させて可動接
触子６を接触子４，５から開離させるトリップ装置（図
示せず）と、電子式過電流引外し装置９などの電源とな
る変流器１０とを含む。FIG. 1 is a side sectional view of a main part of a circuit breaker according to an embodiment of the present invention. In FIG. 1, the circuit breaker includes terminals 2, 3; contacts 4, 5 that are in contact with the terminals 2, 3, respectively; and a main circuit conductive portion including a movable contact 6 that can be separated from and separated from the contacts 4, 5. And an opening / closing mechanism 7 for operating the movable contact 6, and a Hall element 8 attached to a fixed member of the circuit breaker 1 in proximity to the movable contact 6. Further, the circuit breaker 1 is an electronic overcurrent trip device 9 that generates a trip signal according to the output of the Hall element 8, and the circuit breaker 1 is opened and closed according to the trip signal of the electronic overcurrent trip device 9. It includes a trip device (not shown) for operating the mechanism 7 to separate the movable contact 6 from the contacts 4 and 5, and a current transformer 10 serving as a power source of an electronic overcurrent trip device 9 and the like.
【００１０】図２は図１に示した回路遮断器の電気回路
図である。図２において、電子式過電流引外し装置９
は、変流器１０の出力を整流する整流素子１２と、整流
された出力を定電圧化してこの電子式過電流引外し装置
９およびトリップ装置１１の電源となる電源回路１３
と、ホール素子８に基準電流を供給する定電流回路１４
と、ホール素子８の出力に応じて演算などを行なうＣＰ
Ｕ１５と、ホール素子８の出力をＣＰＵ１５に入力する
ために所定の変換を行なう入力信号変換回路１６と、主
回路導電部に過電流が流れたとき開閉接触部を開離する
条件を設定する動作設定手段１７と、ＣＰＵ１５からの
トリップ信号に応じてトリップ装置１１を制御するトラ
ンジスタ１８と、後述する所定の条件の下に動作するリ
レー１９を含む。FIG. 2 is an electric circuit diagram of the circuit breaker shown in FIG. In FIG. 2, an electronic overcurrent trip device 9 is shown.
Is a rectifying element 12 for rectifying the output of the current transformer 10 and a power supply circuit 13 for converting the rectified output to a constant voltage to supply power to the electronic overcurrent trip device 9 and the trip device 11.
And a constant current circuit 14 for supplying a reference current to the Hall element 8
And a CP for performing an operation or the like in accordance with the output of the Hall element 8
U15, an input signal conversion circuit 16 for performing a predetermined conversion for inputting the output of the Hall element 8 to the CPU 15, and an operation for setting conditions for opening and closing the contact portion when an overcurrent flows in the main circuit conductive portion. It includes a setting means 17, a transistor 18 for controlling the trip device 11 in response to a trip signal from the CPU 15, and a relay 19 which operates under predetermined conditions described later.
【００１１】定電流回路１４は、予め定められた第１の
基準電流Ｉ1 および第２の基準電流Ｉ2 （Ｉ1 ＞Ｉ2 ）
の２種類の基準電流を、ＣＰＵ１５からの切換信号によ
って選択的にホール素子８に供給する。ここで、Ｉ1 は
定常時において流す電流であり、Ｉ2 は後述する所定の
条件において流す電流である。The constant current circuit 14 has a predetermined first reference current I 1 and a second reference current I 2 (I 1 > I 2 ).
Are selectively supplied to the Hall element 8 according to the switching signal from the CPU 15. Here, I 1 is a current flowing in a steady state, and I 2 is a current flowing under predetermined conditions described later.
【００１２】ＣＰＵ１５には、入力信号変換回路１６を
介してホール素子８の出力を検知する検知手段と、検知
手段によって検知した検知値と後述する所定値を比較
し、検知値が所定値を越えたとき第１の基準電流を第２
の基準電流に切換える切換信号を発生するとともに検知
手段による検知値に基準電流の変化に反比例した（Ｉ1
／Ｉ2 ）倍を乗じた補正を加える切換手段と、検知手段
による検知値または補正された検知値に応じて演算を行
ない動作設定手段１７による設定条件を満足したときト
リップ信号を発生する演算手段が含まれている。なお、
切換手段は、第２の基準電流が流れている状態で補正さ
れた検知値と前述の所定値の比較を行ない、補正された
検知値が所定値以下になったときは基準電流を第１の基
準電流に切換える信号を発生するとともに、補正されて
いた検知値の補正が解除される。ここで、切換手段を動
作させる検知値に対する所定値は、第１の基準電流が供
給されているとき、ホール素子８自体を入力信号変換回
路１６の電子回路部品が初期の精度を維持しかつ劣化す
ることのない検知値の上限値以下に定められる。The CPU 15 compares the detection value detected by the detection means with the detection means for detecting the output of the Hall element 8 via the input signal conversion circuit 16 and a predetermined value described later. The first reference current to the second
A switching signal for switching to the reference current is generated, and the value detected by the detecting means is inversely proportional to the change in the reference current (I 1
/ I 2 ) switching means for applying a correction multiplied by a factor of 2, and arithmetic means for performing an operation in accordance with the detected value by the detecting means or the corrected detected value and generating a trip signal when the condition set by the operation setting means 17 is satisfied. It is included. In addition,
The switching means compares the detected value corrected in the state where the second reference current is flowing with the above-mentioned predetermined value, and switches the reference current to the first current when the corrected detected value becomes equal to or less than the predetermined value. A signal for switching to the reference current is generated, and the correction of the corrected detection value is released. Here, the predetermined value for the detection value for operating the switching means is such that when the first reference current is supplied, the electronic circuit components of the input signal conversion circuit 16 maintain the initial accuracy and degrade the Hall element 8 itself. It is determined to be equal to or less than the upper limit of the detection value that does not occur.
【００１３】次に、上述のごとく構成された回路遮断器
１の電子式過電流引外し装置９の具体的な動作について
説明する。主回路導電部に電流が流れると、変流器１０
の出力によって定電流回路１４から第１の基準電流Ｉ1
がホール素子８に供給され、主回路導電部を流れる電流
値に比例して発生する磁束がホール素子８と鎖交し、ホ
ール素子８に出力が発生する。この出力ＶH は、ＶH ＝
ｋ・Ｉｃ・Ｂなる一般式で表わされる。ここで、「ｋ：
ホール素子の感度（ホール係数） Ｉｃ：ホール素子に
供給する基準電流 Ｂ：ホール素子を鎖交する磁束密
度」である。Next, a specific operation of the electronic overcurrent trip device 9 of the circuit breaker 1 configured as described above will be described. When a current flows through the conductive portion of the main circuit, the current transformer 10
Output from the constant current circuit 14 to the first reference current I 1
Is supplied to the Hall element 8, and the magnetic flux generated in proportion to the value of the current flowing through the main circuit conductive portion is linked with the Hall element 8, and an output is generated at the Hall element 8. This output V H is given by V H =
It is represented by the general formula k · Ic · B. Here, "k:
Sensitivity of Hall element (Hall coefficient) Ic: Reference current supplied to Hall element B: Magnetic flux density linking the Hall element.
【００１４】この出力が入力信号変換回路１６を介して
ＣＰＵ１５に入力され、まず検知手段においてこの入力
の大きさが検知される。この検知値が前述の所定値と比
較され、その結果検知値が所定値以下であれば切換信号
が生じることなく、すなわち基準電流値が切換わること
なく演算手段において検知値に応じて演算が行なわれ、
動作設定手段１７によって設定された設定値を満足した
ときはトリップ信号が発生し、トランジスタ１８が導通
状態となって、トリップ装置１１が動作して開閉接触部
が開離し、主回路の電流が遮断される。This output is input to the CPU 15 via the input signal conversion circuit 16, and the size of the input is first detected by the detecting means. This detected value is compared with the above-mentioned predetermined value. If the detected value is less than the predetermined value, the switching means does not generate a switching signal, that is, the calculation is performed by the calculating means in accordance with the detected value without switching the reference current value. And
When the set value set by the operation setting means 17 is satisfied, a trip signal is generated, the transistor 18 is turned on, the trip device 11 is operated, the switching contact is opened, and the current of the main circuit is cut off. Is done.
【００１５】一方、比較の結果、検知値が所定値を越え
たとき、切換手段から切換信号が発せられ、ホール素子
８に供給される電流は第１の基準電流から第２の基準電
流に瞬時に切換わる。したがって、ホール素子８の出力
および検知手段による検知値が切換前の（Ｉ2 ／Ｉ1 ）
になる。しかし、切換信号を発するとともに検知手段の
検知値には（Ｉ1 ／Ｉ2 ）倍の補正が加えられる。演算
手段は補正された検知値に応じて演算を行ない、動作設
定手段１７の設定値を満足したときはトリップ信号が発
生する。すなわち、ホール素子８の出力を強制的に低下
させても、演算手段において補正された検知値に応じて
演算が行なわれるため、切換がなかったのと同じ結果が
得られる。On the other hand, as a result of the comparison, when the detected value exceeds a predetermined value, a switching signal is issued from the switching means, and the current supplied to the Hall element 8 is instantaneously changed from the first reference current to the second reference current. Switch to. Therefore, the output of the Hall element 8 and the value detected by the detecting means are (I 2 / I 1 ) before the switching.
become. However, at the same time that the switching signal is issued, the detected value of the detecting means is corrected by (I 1 / I 2 ) times. The calculating means performs a calculation according to the corrected detection value, and when the value set by the operation setting means 17 is satisfied, a trip signal is generated. That is, even if the output of the Hall element 8 is forcibly reduced, the calculation is performed according to the detected value corrected by the calculation means, so that the same result as when there is no switching can be obtained.
【００１６】なお、ホール素子８に第２の基準電流が供
給されている状態で、主回路導電部の電流値が低下して
検知手段による検知値の補正値が前述の所定値以下に低
下したとき、切換手段は切換信号を発してホール素子８
へ供給する電流を第１の基準電流Ｉ1 に切換えるととも
に検知手段の検知値に加えられていた補正が解除されて
元の状態となる。In the state where the second reference current is supplied to the Hall element 8, the current value of the conductive portion of the main circuit decreases, and the correction value of the detection value by the detection means drops below the above-mentioned predetermined value. At this time, the switching means generates a switching signal to generate the Hall element 8.
Is switched to the first reference current I 1, and the correction applied to the detection value of the detection means is canceled to return to the original state.
【００１７】ＣＰＵ１５には、ホール素子８に第１の基
準電流が供給されている状態で切換手段を定期的に発生
させる監視信号発生手段と、監視信号発生手段が動作し
て基準電流が切換えられる直前直後の検知手段による検
知値を比較する比較手段と、比較手段の比較による結
果、後者が前者の（Ｉ2 ／Ｉ1 ）になっていないとき動
作する警報信号発生手段がさらに設けられている。In the CPU 15, the monitoring signal generating means for periodically generating the switching means while the first reference current is being supplied to the Hall element 8, and the monitoring signal generating means are operated to switch the reference current. There are further provided a comparing means for comparing the detection values of the immediately preceding and succeeding detecting means, and an alarm signal generating means which operates when the latter is not the former (I 2 / I 1 ) as a result of the comparison of the comparing means. .
【００１８】この監視信号発生手段が動作したとき、ホ
ール素子８に供給される電流が第１の基準電流から第２
の基準電流に切換えられる。この切換は瞬間的に行なわ
れるため、切換直前直後の主回路導電部を流れる電流は
変動がないと考えてよい。したがって、切換直後の検知
値は切換直前の検知値の（Ｉ2 ／Ｉ1 ）になっているは
ずである。比較手段によってこの両者を比較してそのよ
うになっていない場合は警報信号発生手段が動作してリ
レー１９を動作させ、警報装置を動作させることができ
る。なお、警報信号発生手段が動作する場合としては、
基準電流の切換が正常に行なわれていない場合、ホール
素子８に供給される第１または第２の基準電流が設定し
た値でない場合、基準電流が相違したときホール係数が
変化するというホール素子の劣化などがある。When the monitor signal generating means operates, the current supplied to the Hall element 8 is changed from the first reference current to the second reference current.
To the reference current. Since this switching is performed instantaneously, it can be considered that the current flowing through the main circuit conductive part immediately before and after the switching does not fluctuate. Therefore, the detected value immediately after switching should be (I 2 / I 1 ) of the detected value immediately before switching. The comparing means compares the two, and if not, the alarm signal generating means operates to operate the relay 19 and operate the alarm device. When the alarm signal generating means operates,
When the switching of the reference current is not performed normally, when the first or second reference current supplied to the Hall element 8 is not the set value, when the reference current is different, the Hall coefficient changes. There is deterioration and the like.
【００１９】したがって、監視信号を定期的に発するこ
とによって、これらの状態を自動監視することができ
る。また、監視信号を手動にて随時発生させることもで
きる。なお、この監視信号は、主回路電流が動作設定手
段１７によって設定された動作電流設定値以下の場合に
のみ発せられるため、過電流引外し性能を阻害すること
はない。Therefore, these states can be automatically monitored by periodically issuing a monitoring signal. Also, the monitoring signal can be manually generated at any time. Note that this monitoring signal is issued only when the main circuit current is equal to or less than the operation current set value set by the operation setting means 17, so that the overcurrent tripping performance is not hindered.
【００２０】[0020]
【発明の効果】以上のように、この発明によれば、主回
路電流に大電流が流れたとき、自動的にホール素子の出
力が低下するため、ホール素子自体や電子式過電流引外
し装置の電子回路部品が正しい精度を維持して動作する
とともに劣化することがなく、また電子式過電流引外し
装置の自動監視や随時監視ができ、信頼性を高めること
ができる。As described above, according to the present invention, when a large current flows in the main circuit current, the output of the Hall element is automatically reduced, so that the Hall element itself or the electronic overcurrent trip device is used. The electronic circuit components operate while maintaining correct accuracy and are not deteriorated, and the electronic overcurrent trip device can be automatically monitored and monitored at any time, thereby improving reliability.
【図１】この発明による電子式過電流引外し装置を搭載
した回路遮断器の要部側面断面図である。FIG. 1 is a side sectional view of a main part of a circuit breaker equipped with an electronic overcurrent trip device according to the present invention.
【図２】この発明による電子式過電流引外し装置を搭載
した回路遮断器の電気回路図である。FIG. 2 is an electric circuit diagram of a circuit breaker equipped with an electronic overcurrent trip device according to the present invention.
１ 回路遮断器 ８ ホール素子 ９ 電子式過電流引外し装置 １０ 変流器 １１ トリップ装置 １２ 整流素子 １３ 電源回路 １４ 定電流回路 １５ ＣＰＵ １６ 入力信号変換回路 １７ 動作設定手段 １８ トランジスタ １９ リレー 1 circuit breaker 8 Hall element 9 Electronic overcurrent trip device 10 Current transformer 11 Trip device 12 Rectifier 13 Power supply circuit 14 Constant current circuit 15 CPU 16 Input signal conversion circuit 17 Operation setting means 18 transistors 19 relay
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−180319（ＪＰ，Ａ) 特開 昭57−59426（ＪＰ，Ａ) 特開 昭61−295820（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H02H 3/08 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-180319 (JP, A) JP-A-57-59426 (JP, A) JP-A-61-295820 (JP, A) (58) Field (Int.Cl. 7 , DB name) H02H 3/08
Claims (2)
けられるホール素子を電流センサとする電子式過電流引
外し装置において前記ホール素子に第１の基準電流およ
び前記第１の基準電流より小さい第２の基準電流を切換
信号に応じて選択的に供給する電流電源と、 前記ホール素子の出力を検知する検知手段と、 前記検知手段による検知値が所定値を越えたとき、前記
ホール素子に供給する基準電流を前記第１の基準電流か
ら前記第２の基準電流に切換えるための切換信号を発生
するとともに、前記検知手段による検知値に基準電流の
変化に応じた補正を加える切換手段と、 前記検知手段による前記検知値または前記補正された検
知値に応じて演算を行ない、予め定められた動作設定条
件を満足したとき、前記回路遮断器にトリップ信号を与
えて主回路を遮断させる演算手段とを備えたことを特徴
とする、電子式過電流引外し装置。1. An electronic overcurrent trip device using a Hall element provided as a current sensor in proximity to a main circuit conductive portion of a circuit breaker, wherein the Hall element has a first reference current and a first reference current. A current power supply for selectively supplying a smaller second reference current in accordance with a switching signal; a detecting means for detecting an output of the Hall element; and a detecting means for detecting the output of the Hall element when the detected value exceeds a predetermined value. Switching means for generating a switching signal for switching a reference current supplied to an element from the first reference current to the second reference current, and for correcting a value detected by the detection means in accordance with a change in the reference current And performing an operation in accordance with the detection value or the corrected detection value by the detection means, and when a predetermined operation setting condition is satisfied, a trip signal is sent to the circuit breaker. An electronic overcurrent trip device, comprising: a calculating means for interrupting the main circuit.
を越えていない場合でも前記切換手段を動作させる監視
指令手段と、 前記監視指令手段を動作させたとき、前記基準電流の切
換わり前後のホール素子の出力値を比較し、その比較結
果が所定の結果と異なるとき、警報信号を発する警報信
号発生手段とを備えたことを特徴とする、請求項１に記
載の電子式過電流引外し装置。2. A monitoring commanding means for operating the switching means even when a value detected by the detecting means does not exceed the predetermined value; and 2. An electronic overcurrent trip according to claim 1, further comprising an alarm signal generating means for comparing an output value of the Hall element and issuing an alarm signal when the comparison result is different from a predetermined result. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28204795A JP3537563B2 (en) | 1995-10-30 | 1995-10-30 | Electronic overcurrent trip device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28204795A JP3537563B2 (en) | 1995-10-30 | 1995-10-30 | Electronic overcurrent trip device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09130958A JPH09130958A (en) | 1997-05-16 |
| JP3537563B2 true JP3537563B2 (en) | 2004-06-14 |
Family
ID=17647481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28204795A Expired - Fee Related JP3537563B2 (en) | 1995-10-30 | 1995-10-30 | Electronic overcurrent trip device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3537563B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5997638B2 (en) * | 2013-03-21 | 2016-09-28 | 株式会社日立製作所 | Input conversion board for digital protection controller |
| CN115825601B (en) * | 2022-05-27 | 2026-01-30 | 国网江苏省电力有限公司南通供电分公司 | A method and system for detecting the operating status of the tripping and closing circuit of a relay protection system. |
-
1995
- 1995-10-30 JP JP28204795A patent/JP3537563B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09130958A (en) | 1997-05-16 |
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