JP2002017038A - Earth leakage circuit breaker - Google Patents

Earth leakage circuit breaker

Info

Publication number
JP2002017038A
JP2002017038A JP2000199066A JP2000199066A JP2002017038A JP 2002017038 A JP2002017038 A JP 2002017038A JP 2000199066 A JP2000199066 A JP 2000199066A JP 2000199066 A JP2000199066 A JP 2000199066A JP 2002017038 A JP2002017038 A JP 2002017038A
Authority
JP
Japan
Prior art keywords
leakage
detection
circuit
zero
low
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
Application number
JP2000199066A
Other languages
Japanese (ja)
Inventor
Kiyoshi Goto
潔 後藤
Yoichi Kunimoto
洋一 国本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP2000199066A priority Critical patent/JP2002017038A/en
Publication of JP2002017038A publication Critical patent/JP2002017038A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide an earth leakage circuit breaker which can detect a leakage even when a high frequency signal leaks if a higher leakage current flows from a load side. SOLUTION: This leakage breaker A is provided with a zero-phase current transformer 5 for detecting an unbalanced current. This leakage breaker A is provided with a zero-phase current transformer 5 for detecting an unbalanced current flowing into a main electric path 2 connecting between a commercial AC power supply 1 and a load 3, a detecting resistance 6 connected to this zero-phase current transformer 5 for converting an output current from the zero-phase current transformer 5 to a voltage signal, a low-pass filter 7 for eliminating the high frequency element of the voltage signal from the detection resistance 6, and a leakage detection circuit 8 for opening a contact 4 inserted to the main route 2 based on the voltage signal converted with the detection resistance 6. Moreover, there is additionally provided a clip circuit 14 formed through combination of diodes which are normally and reversely connected in parallel between the detection resistor 6 and low-pass filter 7.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、漏電遮断装置に関
し、詳しくは高周波の漏電についても検出することので
きる漏電遮断装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage interrupting device, and more particularly to an earth leakage interrupting device capable of detecting high frequency earth leakage.

【0002】[0002]

【従来の技術】従来から、接地された商用交流電源と負
荷との間に流れる不平衡電流(差電流)を零相変流器で
検出し、この零相変流器からの出力電流をこれに並列接
続された検出用抵抗で電圧信号に変換して、その後、ロ
ーパスフィルタを介して高周波成分を除去し、このフィ
ルタを通過した後の電圧信号から漏電を検出して回路を
遮断する漏電遮断装置が知られている。
2. Description of the Related Art Conventionally, an unbalanced current (difference current) flowing between a grounded commercial AC power supply and a load has been detected by a zero-phase current transformer, and the output current from the zero-phase current transformer has been detected. Is converted to a voltage signal by a detection resistor connected in parallel to the filter, and then a high-frequency component is removed through a low-pass filter. Devices are known.

【0003】[0003]

【発明が解決しようとする課題】この従来の漏電遮断装
置においては、基本的に商用電源周波数(例えば50〜
60Hz)での漏電検出を目的とするものであって、イン
バータ負荷の接続等による高周波漏電では検出動作をし
ないようにフィルタなどで設定されている。すなわち高
周波の漏電については不感となっている。しかし、たと
え高周波といえども一定レベルを超える漏電電流が流れ
るようであれば、これを検出して回路を遮断させた方が
望ましい。
In this conventional earth leakage breaker, basically, a commercial power supply frequency (for example, 50 to
It is intended to detect leakage at 60 Hz), and is set by a filter or the like so as not to perform a detection operation for high-frequency leakage due to connection of an inverter load or the like. That is, the user is insensitive to high-frequency leakage. However, if a leakage current exceeding a certain level flows even at a high frequency, it is desirable to detect this and shut off the circuit.

【0004】本発明は上記事由に鑑みて為されたもので
あり、その目的は、高周波漏電であっても大きな漏電電
流が負荷から流れ出した場合には漏電検出することがで
きる漏電遮断装置を提供することにある。
The present invention has been made in view of the above circumstances, and an object thereof is to provide an earth leakage interrupting device capable of detecting an earth leakage when a large earth leakage current flows out of a load even in the case of high frequency earth leakage. Is to do.

【0005】[0005]

【課題を解決するための手段】上記課題を解決するため
に請求項1記載の漏電遮断装置は、商用低周波域の交流
電源と漏電検出すべき負荷との間に介在する主電路と、
この主電路に挿入された接点と、前記主電路に流れる不
平衡電流を検出する零相変流器と、この零相変流器の出
力に並列に接続した検出用抵抗と、この検出用抵抗の検
出信号の高周波成分を除去するローパスフィルタと、こ
のローパスフィルタを通過する前記検出用抵抗の検出信
号に基づいて漏電を検出して前記接点を開放させる漏電
検出回路と、前記検出用抵抗と前記ローパスフィルタと
の間に正逆で並列接続されたダイオードの組合せによっ
てなるクリップ回路とを備えたことを特徴とするもので
ある。
According to a first aspect of the present invention, there is provided an electric leakage breaker comprising: a main electric circuit interposed between an AC power supply in a commercial low frequency band and a load to be detected;
A contact inserted into the main circuit, a zero-phase current transformer for detecting an unbalanced current flowing in the main circuit, a detection resistor connected in parallel to an output of the zero-phase current transformer, and a detection resistor A low-pass filter that removes a high-frequency component of the detection signal, a leakage detection circuit that detects leakage based on a detection signal of the detection resistor passing through the low-pass filter, and opens the contact point; A low-pass filter and a clip circuit formed by a combination of diodes connected in parallel in reverse and in reverse.

【0006】この漏電遮断装置によると、高周波におけ
る漏電電流が負荷から流れ出した場合には、前記零相変
流器が前記主電路に流れる不平衡電流を検出して出力
し、この出力電流を前記検出用抵抗で電圧信号に変換す
る。この電圧信号が一定レベル(前記クリップ回路を構
成するダイオードの順方向電圧降下)よりも小さな電圧
信号であったときには、ダイオードに電流が流れず、そ
の信号は前記ローパスフィルタ7によって除去されるた
め、漏電検出されることはない。一方、大きくなりうる
ような電圧信号であったときには、ダイオードに順方向
電流が流れて、前記検出用抵抗6の両端にかかる電圧を
ダイオードの順方向電圧降下の値に制限している。そし
て、制限されている期間において前記検出用抵抗の両端
にかかる電圧は、順方向電圧降下の値で一定値となるた
め直流成分の電圧信号となり、後段の前記ローパスフィ
ルタを通過して、前記漏電検出回路で漏電検出されるこ
とになる。よって、高周波の漏電であっても大きな漏電
電流が負荷から流れ出した場合には漏電検出が可能とな
る。
According to this earth leakage breaker, when an earth leakage current at a high frequency flows out of the load, the zero-phase current transformer detects and outputs an unbalanced current flowing in the main circuit, and outputs this output current to the It is converted into a voltage signal by the detection resistor. When this voltage signal is smaller than a certain level (a forward voltage drop of the diode constituting the clipping circuit), no current flows through the diode, and the signal is removed by the low-pass filter 7. No leakage is detected. On the other hand, when the voltage signal is such that it can be increased, a forward current flows through the diode, and the voltage applied across the detection resistor 6 is limited to the value of the forward voltage drop of the diode. The voltage applied to both ends of the detection resistor during the limited period becomes a DC component voltage signal because it becomes a constant value of the forward voltage drop, and passes through the low-pass filter at the subsequent stage, thereby causing the leakage. Electric leakage is detected by the detection circuit. Therefore, even when high-frequency leakage occurs, leakage detection can be performed when a large leakage current flows out of the load.

【0007】また、請求項2記載の漏電遮断装置は、請
求項1の装置において、前記クリップ回路のうち順方向
電圧特性の異なるダイオードを正逆組合せすることで、
正負対称の高周波漏電であっても、大きな漏電電流が負
荷から流れ出した場合には漏電検出が可能となる。
According to a second aspect of the present invention, there is provided a ground fault interrupting device according to the first aspect, wherein diodes having different forward voltage characteristics in the clip circuit are combined in a forward / reverse manner.
Even in the case of a high-frequency leakage current having a positive / negative symmetry, if a large leakage current flows out of the load, the leakage detection can be performed.

【0008】また、請求項3記載の漏電遮断装置は請求
項1,2の装置において、前記クリップ回路のダイオー
ドを正逆夫々において複数直列接続することで、高周波
漏電が発生した場合の漏電検出動作させるレベルを設定
できる。
[0008] In a third aspect of the present invention, there is provided an earth leakage interrupting device according to the first and second embodiments, wherein a plurality of diodes of the clip circuit are connected in series in each of the forward and reverse directions to detect an earth leakage when a high-frequency leakage occurs. You can set the level to be performed.

【0009】[0009]

【発明の実施の形態】以下、本発明の実施形態について
説明する。図1は、本発明の実施形態に係る漏電遮断装
置を示す回路ブロック図である。この漏電遮断装置A
は、図1に示すように、接地された商用交流電源1と漏
電検出すべき負荷3との間をつなぐ主電路2に流れる不
平衡電流(差電流)を検出する零相変流器5と、この零
相変流器5に並列接続され零相変流器5からの出力電流
を電圧信号に変換する検出用抵抗6と、この検出用抵抗
6により変換された電圧信号の高周波成分を除去するロ
ーパスフィルタ7とを備えている。この実施形態におい
てローパスフィルタ7は、入力側抵抗9とコンデンサ1
0とを有するCRフィルタとして設けられており、例え
ば雷サージ等により零相変流器5から大きな出力がされ
たとしても、入力側抵抗9によって後段へ流れ込む入力
電流を制限することができるようになっている。
Embodiments of the present invention will be described below. FIG. 1 is a circuit block diagram showing a ground fault interrupting device according to an embodiment of the present invention. This earth leakage interrupter A
As shown in FIG. 1, a zero-phase current transformer 5 for detecting an unbalanced current (differential current) flowing in a main electric circuit 2 connecting a grounded commercial AC power supply 1 and a load 3 to be subjected to leakage detection. A detection resistor 6 connected in parallel to the zero-phase current transformer 5 for converting an output current from the zero-phase current transformer 5 into a voltage signal, and removing a high-frequency component of the voltage signal converted by the detection resistor 6 And a low-pass filter 7. In this embodiment, the low-pass filter 7 includes an input-side resistor 9 and a capacitor 1.
It is provided as a CR filter having zero, so that even if a large output is generated from the zero-phase current transformer 5 due to, for example, a lightning surge, the input current flowing into the subsequent stage can be limited by the input-side resistor 9. Has become.

【0010】また、漏電遮断装置Aは、検出用抵抗6に
より変換された電圧信号に基づいて、主電路2に挿入さ
れた接点4を開放させる漏電検出回路8を備えている。
この漏電遮断装置Aにおいて、漏電検出回路8はICに
より構成され、検出用抵抗6により変換された電圧信号
を増幅する増幅部(不図示)と、増幅部の出力信号に基
づいて漏電を検出すると主電路2に挿入された接点4を
開放させる漏電判断部(不図示)とを備えている。
[0010] Further, the earth leakage interrupting device A includes an earth leakage detecting circuit 8 for opening the contact 4 inserted into the main electric line 2 based on the voltage signal converted by the detecting resistor 6.
In the earth leakage interrupting device A, the earth leakage detection circuit 8 is configured by an IC, and an amplifier (not shown) for amplifying the voltage signal converted by the detection resistor 6 and detecting an earth leakage based on an output signal of the amplifier. A leakage determining unit (not shown) for opening the contact 4 inserted in the main electric circuit 2 is provided.

【0011】また、漏電遮断装置Aは、漏電検出回路8
へ直流電圧を供給する直流電源11を備えている。直流
電源11は、商用交流電源1を整流する整流器12と、
整流器12の出力を平滑する平滑回路13とで構成され
ている。
Further, the earth leakage interrupting device A includes an earth leakage detecting circuit 8.
A DC power supply 11 for supplying a DC voltage to the power supply. DC power supply 11 includes a rectifier 12 that rectifies commercial AC power supply 1,
And a smoothing circuit 13 for smoothing the output of the rectifier 12.

【0012】さらに、この漏電遮断装置Aは、検出用抵
抗6とローパスフィルタ7との間にクリップ回路14を
備えている。このクリップ回路14は互いに正逆反対方
向で並列接続された一対のダイオードの組合せによって
構成されている。このクリップ回路14は、例えば負荷
3としてインバータ等の高周波が発生する機器が使用さ
れる場合において、一定レベルを超える高周波漏電を検
出するためのものである。
Further, the earth leakage cutoff device A includes a clip circuit 14 between the detection resistor 6 and the low-pass filter 7. The clip circuit 14 is constituted by a combination of a pair of diodes connected in parallel in opposite directions. This clip circuit 14 is for detecting a high-frequency leakage exceeding a certain level, for example, when a device generating a high frequency such as an inverter is used as the load 3.

【0013】この漏電遮断装置Aの動作について説明す
る。まず低周波漏電(例えば50〜60Hzの商用周波数
域)の場合の動作について説明すると、負荷3での低周
波漏電に起因して主電路2に生じる不平衡電流を零相変
流器5が検出し、2次出力側に検出信号として低周波の
交流電流を出力する。この出力電流は検出用抵抗6によ
り電圧信号に変換される。この電圧信号は低周波信号で
あるためローパスフィルタ7をパスして漏電検出回路8
に送られる。漏電検出回路8では、前記電圧信号を増幅
した後、その値の大きさに基づき漏電の有無が判断され
る。そして漏電有りと判断したとき、主電路2の接点4
が開放される。
The operation of the earth leakage interrupter A will be described. First, the operation in the case of low-frequency leakage (for example, a commercial frequency range of 50 to 60 Hz) will be described. The zero-phase current transformer 5 detects an unbalanced current generated in the main circuit 2 due to the low-frequency leakage in the load 3. Then, a low-frequency alternating current is output as a detection signal to the secondary output side. This output current is converted into a voltage signal by the detection resistor 6. Since this voltage signal is a low-frequency signal, it passes through the low-pass filter 7 and
Sent to After amplifying the voltage signal, the leakage detection circuit 8 determines whether there is a leakage based on the magnitude of the value. When it is determined that there is a leakage, the contact 4 of the main circuit 2
Is released.

【0014】次に高周波漏電の場合の動作について説明
する。負荷3での漏電が高周波の場合には、零相変流器
5から2次出力側に出力される検出信号は高周波交流電
流となる。この漏電遮断装置Aでは、この高周波交流電
流が一定レベルの大きさを超えると漏電を検出できるよ
うになっており、このレベルはクリップ回路14を構成
するダイオードの順方向電圧降下により定まる。まず、
零相変流器5から出力される前記高周波交流電流は検出
用抵抗6により電圧信号に変換される。この際に、例え
ばクリップ回路14を順方向電圧降下が0.7Vのダイ
オードで構成したと仮定すると、検出用抵抗6での変換
電圧が0.7V未満となるような小さな高周波交流電流
が零相変流器5から出力された場合には、ダイオードに
は電流が流れず、そのまま高周波の交流電圧に変換され
るので、後段のローパスフィルタ7で除去されることに
なる。このため、この場合には漏電検出回路8で漏電検
出されることはない。一方、前記高周波交流電流が0.
7Vよりも大きな電圧値に変換されうる場合には、ダイ
オードに順方向電流が流れて、検出用抵抗6の両端にか
かる電圧はダイオードの順方向電圧降下の値(0.7
V)に制限される。例えば、零相変流器5の出力がオー
ムの法則に従えば、検出用抵抗6において1.0V相当
の高周波交流電圧に変換されうる出力電流であれば、ダ
イオードに0.3V分に相当する順方向電流が流れるた
め、実際には、検出用抵抗6の両端電圧は0.7Vに制
限されることになる。そして、前記両端電圧が一定値
(0.7V)に制限されている期間は、見かけ上、直流
電圧となる。このため、後段のローパスフィルタ7をパ
スして、漏電検出回路8に送られ漏電検出が可能とな
る。このように高周波の漏電であっても、零相変流器5
から2次出力側に出力される高周波交流電流が一定レベ
ルの大きさを超えたときには漏電検出が可能となる。
Next, the operation in the case of high-frequency leakage will be described. When the leakage at the load 3 is at a high frequency, the detection signal output from the zero-phase current transformer 5 to the secondary output side is a high-frequency AC current. In the earth leakage breaker A, if the high-frequency AC current exceeds a certain level, an earth leakage can be detected, and this level is determined by a forward voltage drop of a diode constituting the clip circuit 14. First,
The high-frequency AC current output from the zero-phase current transformer 5 is converted into a voltage signal by the detection resistor 6. At this time, for example, assuming that the clip circuit 14 is constituted by a diode having a forward voltage drop of 0.7 V, a small high-frequency AC current such that the conversion voltage at the detection resistor 6 becomes less than 0.7 V is zero-phase. When the current is output from the current transformer 5, no current flows through the diode, and the diode is directly converted into a high-frequency AC voltage, so that it is removed by the low-pass filter 7 at the subsequent stage. Therefore, in this case, the leakage detection is not detected by the leakage detection circuit 8. On the other hand, when the high-frequency alternating current is in the range of 0.
If the voltage can be converted to a voltage value larger than 7 V, a forward current flows through the diode, and the voltage applied across the detection resistor 6 is equal to the value of the forward voltage drop of the diode (0.7
V). For example, if the output of the zero-phase current transformer 5 complies with Ohm's law, if the output current can be converted to a high-frequency AC voltage equivalent to 1.0 V at the detection resistor 6, it corresponds to 0.3 V for the diode. Since a forward current flows, the voltage across the detection resistor 6 is actually limited to 0.7V. Then, during a period in which the voltage between both ends is limited to a constant value (0.7 V), the voltage is apparently a DC voltage. For this reason, the signal is sent to the leak detection circuit 8 through the low-pass filter 7 at the subsequent stage, and the leak can be detected. Even in the case of such high-frequency leakage, the zero-phase current transformer 5
When the high-frequency AC current output from the power supply to the secondary output side exceeds a certain level, leakage detection can be performed.

【0015】図2は、クリップ回路14を構成する各方
向のダイオードを複数直列接続した様態が示されてい
る。このようにすることで順方向電圧降下の値、すなわ
ち高周波漏電の検出レベルの設定が可能となる。ここで
は正逆夫々2個のダイオードが直列接続されているが、
例えば個々のダイオードの順方向電圧降下の値が0.7
Vだとすれば合計で1.4Vとなり、零相変流器5から2
次出力側に出力される前記高周波交流電流が、より大き
な前記電圧信号(1.4V以上)に変換されうる場合で
ないとクリップされることはない。
FIG. 2 shows an embodiment in which a plurality of diodes in each direction constituting the clip circuit 14 are connected in series. By doing so, it is possible to set the value of the forward voltage drop, that is, the detection level of the high-frequency leakage. Here, two diodes each for forward and reverse are connected in series.
For example, if the value of the forward voltage drop of each diode is 0.7
If it is V, it becomes 1.4V in total, and 2 from zero-phase current transformer 5
Unless the high-frequency AC current output to the next output side can be converted into the larger voltage signal (1.4 V or more), the high-frequency AC current is not clipped.

【0016】このように、クリップ回路14を構成する
にあたっては必要に応じて個々のダイオードの特性や個
数を選択して組合せて使用することができる。
As described above, when configuring the clipping circuit 14, the characteristics and number of individual diodes can be selected and used in combination as needed.

【0017】ところで、高周波漏電の波形は正負不対称
となるのが通常である。このため、クリップ回路14の
ダイオードは正逆方向で、順方向電圧特性の異なるもの
とする必要はない。但し、高周波漏電の波形が正負対称
となる場合も起こりうる。このような場合には、クリッ
プ回路14を構成するダイオードの順方向電圧特性を異
なるものとすればよい。すなわち、仮に順方向電圧特性
が同一であったとすると、ダイオードの順方向電圧降下
の値に制限された検出用抵抗6の前記両端電圧は、正負
の方向だけで異なることになり、強いては制限されてい
る期間の電圧の大きさ、時間間隔ともに等しくなるので
ローパスフィルタ7によって相殺され、ローパスフィル
タ7を通過する信号が得られない。一方、クリップ回路
14を構成するダイオードの順方向電圧特性を異なるも
のにすると、たとえ高周波漏電の波形が正負対称となっ
た場合でも、ダイオードで制限されている期間の電圧の
大きさと時間間隔が正負で異なるものとなるため、ロー
パスフィルタ7をパスする直流成分の電圧信号が得ら
れ、大きな漏電電流が負荷から流れ出した場合の高周波
漏電を検出できることになるからである。
Incidentally, the waveform of the high-frequency leakage current is usually symmetrical in the positive and negative directions. For this reason, it is not necessary that the diodes of the clip circuit 14 have forward and reverse directions and different forward voltage characteristics. However, a case may occur where the waveform of the high frequency leakage has a positive / negative symmetry. In such a case, the diodes constituting the clip circuit 14 may have different forward voltage characteristics. That is, assuming that the forward voltage characteristics are the same, the voltages at both ends of the detection resistor 6 limited to the value of the forward voltage drop of the diode are different only in the positive and negative directions, and are strongly restricted. Since the magnitude and the time interval of the voltage during the given period are both equal, they are canceled by the low-pass filter 7 and a signal passing through the low-pass filter 7 cannot be obtained. On the other hand, if the forward voltage characteristics of the diodes constituting the clipping circuit 14 are made different, even if the waveform of the high frequency leakage becomes symmetrical, the magnitude of the voltage and the time interval during the period limited by the diodes are positive and negative. Is obtained, a voltage signal of a DC component passing through the low-pass filter 7 is obtained, and high-frequency leakage when a large leakage current flows out of the load can be detected.

【0018】[0018]

【発明の効果】以上、説明したように、請求項1の発明
では、負荷としてインバータ機器等を使用する場合によ
る高周波漏電においても、大きな漏電電流が生じた場合
には漏電検出することができる。
As described above, according to the first aspect of the present invention, even in the case of a high-frequency earth leakage caused by using an inverter device or the like as a load, an earth leakage can be detected when a large earth leakage current occurs.

【0019】請求項2の発明では、高周波漏電の波形が
正負対称の場合であっても、大きな漏電電流が負荷から
流れ出した場合の高周波漏電検出が可能である。
According to the second aspect of the present invention, even when the waveform of the high-frequency leakage is symmetrical, the high-frequency leakage can be detected when a large leakage current flows out of the load.

【0020】請求項3の発明では、高周波の漏電に対
し、直列接続するダイオードの数を変更することで、漏
電検出レベルを適宜設定できる。
According to the third aspect of the present invention, the leakage detection level can be appropriately set by changing the number of diodes connected in series with respect to high-frequency leakage.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施形態に係る漏電遮断装置を示す回
路ブロック図である。
FIG. 1 is a circuit block diagram showing a ground fault interrupting device according to an embodiment of the present invention.

【図2】上記実施形態において、クリップ回路にて複数
のダイオードを直列接続した態様を示す回路ブロック図
である。
FIG. 2 is a circuit block diagram showing a mode in which a plurality of diodes are connected in series by a clip circuit in the embodiment.

【符号の説明】[Explanation of symbols]

1 商用交流電源 2 主電路 3 負荷 4 接点 5 零相変流器 6 検出用抵抗 7 ローパスフィルタ 8 漏電検出回路 14 クリップ回路 A 漏電遮断装置 DESCRIPTION OF SYMBOLS 1 Commercial AC power supply 2 Main circuit 3 Load 4 Contact 5 Zero-phase current transformer 6 Detection resistor 7 Low-pass filter 8 Leakage detection circuit 14 Clip circuit A Leakage breaker

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 商用低周波域の交流電源と漏電検出すべ
き負荷との間に介在する主電路と、この主電路に挿入さ
れた接点と、前記主電路に流れる不平衡電流を検出する
零相変流器と、この零相変流器の出力側に並列に接続し
た検出用抵抗と、この検出用抵抗の検出信号の高周波成
分を除去するローパスフィルタと、このローパスフィル
タを通過する前記検出用抵抗の検出信号に基づいて漏電
を検出して前記接点を開放させる漏電検出回路と、前記
検出用抵抗と前記ローパスフィルタとの間に正逆で並列
接続されたダイオードの組合せによってなるクリップ回
路とを備えたことを特徴とする漏電遮断装置。
1. A main circuit interposed between an AC power supply in a commercial low-frequency range and a load to be detected for leakage, a contact inserted into the main circuit, and a zero for detecting an unbalanced current flowing in the main circuit. A phase current transformer, a detection resistor connected in parallel to the output side of the zero-phase current transformer, a low-pass filter for removing a high-frequency component of a detection signal of the detection resistor, and the detection passing through the low-pass filter. A leakage detection circuit that detects a leakage based on a detection signal of the detection resistor and opens the contact, and a clip circuit formed by a combination of a diode connected in parallel in a reverse direction between the detection resistor and the low-pass filter. An earth leakage cut-off device comprising:
【請求項2】 前記クリップ回路は、順方向電圧特性の
異なるダイオードの正逆組合せであることを特徴とする
請求項1記載の漏電遮断装置。
2. The earth leakage cut-off device according to claim 1, wherein the clip circuit is a combination of forward and reverse diodes having different forward voltage characteristics.
【請求項3】 前記クリップ回路のダイオードは正逆夫
々において複数直列接続されていることを特徴とする請
求項1又は2記載の漏電遮断装置。
3. The earth leakage cut-off device according to claim 1, wherein a plurality of diodes of the clip circuit are connected in series in each of forward and reverse directions.
JP2000199066A 2000-06-30 2000-06-30 Earth leakage circuit breaker Pending JP2002017038A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000199066A JP2002017038A (en) 2000-06-30 2000-06-30 Earth leakage circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000199066A JP2002017038A (en) 2000-06-30 2000-06-30 Earth leakage circuit breaker

Publications (1)

Publication Number Publication Date
JP2002017038A true JP2002017038A (en) 2002-01-18

Family

ID=18697135

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000199066A Pending JP2002017038A (en) 2000-06-30 2000-06-30 Earth leakage circuit breaker

Country Status (1)

Country Link
JP (1) JP2002017038A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101777752A (en) * 2010-03-04 2010-07-14 浙江上力电器有限公司 Intelligent low-voltage network comprehensive protection device
WO2019193743A1 (en) * 2018-04-06 2019-10-10 三菱電機株式会社 Electric leak detection device and electric leak circuit breaker
CN111969575A (en) * 2020-08-13 2020-11-20 广东电网有限责任公司 Arc extinction method, device and equipment for single-phase earth fault of power distribution network and storage medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101777752A (en) * 2010-03-04 2010-07-14 浙江上力电器有限公司 Intelligent low-voltage network comprehensive protection device
WO2019193743A1 (en) * 2018-04-06 2019-10-10 三菱電機株式会社 Electric leak detection device and electric leak circuit breaker
CN111969575A (en) * 2020-08-13 2020-11-20 广东电网有限责任公司 Arc extinction method, device and equipment for single-phase earth fault of power distribution network and storage medium
CN111969575B (en) * 2020-08-13 2023-03-28 广东电网有限责任公司 Arc extinction method, device and equipment for single-phase earth fault of power distribution network and storage medium

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