JP2008206360A - Earth leakage relay - Google Patents

Earth leakage relay Download PDF

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JP2008206360A
JP2008206360A JP2007042132A JP2007042132A JP2008206360A JP 2008206360 A JP2008206360 A JP 2008206360A JP 2007042132 A JP2007042132 A JP 2007042132A JP 2007042132 A JP2007042132 A JP 2007042132A JP 2008206360 A JP2008206360 A JP 2008206360A
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circuit
leakage
zero
phase current
current transformer
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JP4869103B2 (en
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Kenji Kanayama
健志 金山
Takashi Yamanaka
尚 山中
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To acquire an earth leakage relay for entering a test simulation waveform to an earth leakage detection circuit or prompting the input by a user in a state that a normal connection to a zero-phase current transformer is confirmed without using a switch on a signal line within the earth leakage detection circuit. <P>SOLUTION: The earth leakage relay includes: a Wheatstone bridge 41 provided between the earth leakage detection circuit 46 and the zero-phase current transformer 20, and having four detection resistors 42 disposed on four sides; a comparison circuit 50 for comparing a potential between middle points A, B in the Wheatstone bridge 41; and a simulation waveform generating circuit 53 biased in response to an operation of a test button 52 while the comparison circuit generates an output, and injecting the test simulation waveform into the earth leakage detection circuit 46. If the zero-phase current transformer 20 is normally connected, the Wheatstone bridge 41 is configured so as to generate the potential between the middle points A, B which causes the comparison circuit 50 to generate the predetermined output. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、電路の零相電流を検出する零相変流器と接続され、その検出電流に基づいて電路の漏電状態を監視する漏電リレーに関するものである。   The present invention relates to a leakage relay that is connected to a zero-phase current transformer that detects a zero-phase current of an electric circuit and monitors an electric leakage state of the electric circuit based on the detected current.

回路遮断器の一つである漏電遮断器は、例えば集積回路で構成された漏電検出回路、零相変流器、および電磁石装置を内蔵し、漏電検出回路にて零相変流器で検出された信号のレベル判定を行い、所定値を超えれば電磁石装置に対し駆動信号を出力させ、主回路を開放することは周知の通りである。また、この漏電検出機能が正常に動作し得るかどうか確認するテスト装置（テストボタン）が搭載されていることも周知の通りである。   An earth leakage breaker, which is one of the circuit breakers, incorporates an earth leakage detection circuit, a zero-phase current transformer, and an electromagnet device configured by, for example, an integrated circuit, and is detected by the zero-phase current transformer in the earth leakage detection circuit. As is well known, the signal level is determined, and if a predetermined value is exceeded, a drive signal is output to the electromagnet device and the main circuit is opened. It is also well known that a test device (test button) is installed to check whether this leakage detection function can operate normally.

この漏電遮断器は、感電防止、あるいは漏電火災保護の観点から、電気設備技術基準などの規則にしたがい設置されることになるが、漏電火災保護において、主回路を直ちに開放したのでは都合の悪い箇所（例えば、病院の手術室や排煙装置など）では主回路の通電は継続させ、漏電が発生している旨の警報を発するに留め、例えば、主回路を開放しても差し支えのない時間帯にて、しかるべき処置を施すことが知られている。この警報を発する手段として、主回路に配設した別体の零相変流器と、この零相変流器からの信号線が接続される漏電リレーが使用されているが、この漏電リレーについては、「漏電監視」という点に鑑み、主回路から離れた、例えば電気管理室などに設置されていることが一般的である。   This earth leakage breaker will be installed in accordance with the electrical equipment technical standards from the viewpoint of electric shock prevention or earth leakage fire protection, but it is inconvenient if the main circuit is opened immediately for earth leakage fire protection. Keep the main circuit energized at the location (for example, hospital operating room or smoke evacuation device), and only issue an alarm that a leakage has occurred. For example, the time when the main circuit can be opened. It is known to take appropriate measures in the band. As a means for issuing this alarm, a separate zero-phase current transformer disposed in the main circuit and a leakage relay to which a signal line from this zero-phase current transformer is connected are used. In view of the “leakage monitoring”, it is generally installed in an electrical management room, for example, away from the main circuit.

ところで、この漏電リレーにもテスト装置が搭載されているが、以下の点で前述した漏電遮断器のテスト装置との違いがある。すなわち、漏電リレーは、これ単独でテストが可能となっており、このテストにより、内蔵する集積回路やリレー（漏電遮断器における電磁石装置に相当）の機能あるいは動作を確認することができるようになっている。つまり、零相変流器からの信号線を接続する前であっても、漏電リレー単体としての動作確認が可能である。
これは、配電施工において、必ずしも零相変流器と漏電リレーを同時に設置するとは限らないことや、前述したように、集積回路など漏電検出機能に係わる核となる部品が漏電リレーに搭載されていることから、その万が一の故障をいち早く把握できるようにする必要性があることなどが背景にあるものと考えられる。
しかしながら、このことは、言い換えると、実使用、すなわち、零相変流器との接続状態下であっても、テストによる零相変流器そのものの確認はできていないことになる。つまり、仮に零相変流器との間の信号線の断線や欠線があったとしても、漏電リレー内部にさえ問題なければ、テストボタンの操作による漏電警報が発せられることになってしまう。このため、漏電リレーであっても、漏電遮断器並みのテスト装置の信頼性向上が求められている。 By the way, this earth leakage relay is also equipped with a test device, but differs from the above-described earth leakage circuit breaker test device in the following points. In other words, the earth leakage relay can be tested alone, and this test makes it possible to confirm the function or operation of a built-in integrated circuit or relay (equivalent to an electromagnetic device in an earth leakage breaker). ing. In other words, even before the signal line from the zero-phase current transformer is connected, it is possible to confirm the operation as a single leakage relay.
This is because the zero-phase current transformer and the earth leakage relay are not necessarily installed at the same time in distribution construction, and as described above, the core components related to the earth leakage detection function such as an integrated circuit are mounted on the earth leakage relay. Therefore, it is thought that there is a need to be able to quickly grasp the failure in the unlikely event.
However, in other words, this means that the zero-phase current transformer itself cannot be confirmed by a test even in actual use, that is, in a connected state with the zero-phase current transformer. That is, even if there is a disconnection or breakage of the signal line with the zero-phase current transformer, if there is no problem even in the earth leakage relay, an earth leakage alarm by operating the test button will be issued. For this reason, even if it is an earth-leakage relay, the reliability improvement of the test apparatus equivalent to an earth-leakage circuit breaker is calculated | required.

尤も、テストそのものに着目すれば、例えば、可変抵抗器で零相変流器の異極間を跨ぐように短絡し、この可変抵抗器の抵抗値を徐々に減少させるようにすれば、零相変流器にとっては漏洩電流の模擬的な増加と認識することから、テスト装置に頼らず、しかも、零相変流器を含めた漏電検出機能の確認も可能ではあるものの、安全面、あるいは簡便性を考慮した場合、あまり得策とは言い難い。
そこで、漏電検出回路内の信号ラインをテストボタンの操作に連動して開閉するスイッチを漏電検出回路内の信号ラインに具備するとともに、このスイッチの開時に漏電リレー内で生成される基準電位、あるいは発振回路からの擬似信号を、零相変流器との信号線を介して零相変流器の二次巻線に注入し、それを漏電検出回路に戻すことで、その信号そのものを漏洩電流の模擬的な増加と認識して、漏電警報を発することが知られている（例えば、特許文献１参照）。 However, if attention is paid to the test itself, for example, if a short-circuit is made across the different poles of the zero-phase current transformer with a variable resistor, and the resistance value of this variable resistor is gradually reduced, the zero-phase For current transformers, it is recognized that this is a simulated increase in leakage current, so it is possible to check the leakage detection function including the zero-phase current transformer without relying on the test equipment, but in terms of safety or simplicity. When considering gender, it is not very good.
Therefore, the signal line in the leakage detection circuit is provided with a switch that opens and closes the signal line in the leakage detection circuit in conjunction with the operation of the test button, and the reference potential generated in the leakage relay when the switch is opened, or The pseudo signal from the oscillation circuit is injected into the secondary winding of the zero-phase current transformer via the signal line with the zero-phase current transformer, and then returned to the leakage detection circuit, so that the signal itself is a leakage current. It is known that a leakage alarm is issued by recognizing that this is a simulated increase (see, for example, Patent Document 1).

特開２００３−２７４５５０号公報（段落００１４〜００２０）JP 2003-274550 A (paragraphs 0014 to 0020)

上記のような従来の漏電リレーのテスト装置は、零相変流器との接続を要することで、この零相変流器の故障、あるいは零相変流器と漏電リレー間の信号線の断線、欠線の有無が、テスト動作で確認できるため、漏電監視という行為のみに着目すれば、その信頼性はより向上されていることは言うまでもない。
しかしながら、この実現にあたっては、漏電検出回路内のいわゆる微弱信号ラインにスイッチを必要とし、しかも、テスト時以外の通常使用状態ではｂ接点（常閉接点）での通電を余儀なくされるため、スイッチの接触不良などによる漏電検出回路、ひいては製品そのものの信頼性が低下するという問題を抱えていた。 The conventional leakage relay test apparatus as described above requires a connection with a zero-phase current transformer, so that the failure of this zero-phase current transformer or the disconnection of the signal line between the zero-phase current transformer and the leakage relay Since the presence or absence of a broken line can be confirmed by a test operation, it goes without saying that the reliability is further improved if attention is paid only to the act of monitoring leakage.
However, in order to realize this, since a switch is required for the so-called weak signal line in the leakage detection circuit, and in the normal use state other than during the test, energization at the b contact (normally closed contact) is unavoidable. There was a problem that the reliability of the leakage detection circuit due to poor contact and the reliability of the product itself declined.

この発明は、上述のような課題を解決するためになされたもので、漏電検出回路内の信号ラインにスイッチを使用することなく、零相変流器との正常な接続を確認した状態で、テスト用模擬波形を漏電検出回路に入力でき、あるいはその入力を使用者に促すことができる漏電リレーを得ることを目的とするものである。   The present invention was made to solve the above-described problems, and without using a switch for the signal line in the leakage detection circuit, in a state where normal connection with the zero-phase current transformer was confirmed, It is an object of the present invention to obtain a leakage relay that can input a simulated waveform for testing into a leakage detection circuit or can prompt the user to input the waveform.

この発明に係る漏電リレーは、電路の零相電流を検出する零相変流器と接続され、その検出電流に基づいて電路の漏電状態を監視する漏電リレーにおいて、上記零相変流器の検出電流を電圧信号に変換する検出抵抗と、上記電圧信号のレベルを判定し上記電路の漏電を検出する漏電検出回路と、この漏電検出回路と上記零相変流器との間に設けられ、上記検出抵抗を一辺とする４辺の抵抗からなるホイートストンブリッジと、このホイートストンブリッジの中点間の電位を比較する比較回路と、この比較回路が所定出力を発生している状態で、テストボタンの操作に応じて付勢され、テスト用の模擬波形を上記漏電検出回路に注入する模擬波形発生回路とを備え、上記ホイートストンブリッジは、上記零相変流器が正常に接続されている場合、上記中点間に、上記比較回路が上記所定出力を発生するような電位差を生じるように設定されている。   An earth leakage relay according to the present invention is connected to a zero-phase current transformer that detects a zero-phase current in an electric circuit, and detects the zero-phase current transformer in the earth-leakage relay that monitors an electric current leakage state based on the detected current. A detection resistor for converting a current into a voltage signal, a leakage detection circuit for determining a level of the voltage signal and detecting a leakage of the electric circuit, and provided between the leakage detection circuit and the zero-phase current transformer, A Wheatstone bridge consisting of four resistances with one side of the detection resistor, a comparison circuit that compares the potential between the midpoints of the Wheatstone bridge, and operation of the test button while the comparison circuit generates a predetermined output And a simulated waveform generation circuit that injects a simulated waveform for testing into the leakage detection circuit, and the Wheatstone bridge is connected to the zero-phase current transformer normally. Between the middle point, the comparator circuit is configured to produce a potential difference such as to generate the predetermined output.

この発明によれば、テストボタンの操作により、漏電リレー内部の故障有無はもとより、零相変流器との接続の異常有無、さらには零相変流器そのものの故障有無が確認でき、確実な漏電監視を実行する信頼性の高い漏電リレーを使用者に提供することができる。   According to this invention, by operating the test button, it is possible to confirm whether there is an abnormality in the connection with the zero-phase current transformer, as well as whether there is a fault in the zero-phase current transformer itself, as well as whether there is a fault inside the leakage relay, It is possible to provide a user with a reliable leakage relay that performs leakage monitoring.

実施の形態１．
図１はこのこの発明の実施の形態１における漏電リレーを含む回路図を示すものである。
漏電リレー４０は、主回路の電路１０に設けられ、電路１０の零相電流を検出する零相変流器２０の両端に接続リード線３０を介して接続されており、零相変流器２０の出力電流を電圧信号に変換する検出抵抗４２と、この検出抵抗４２からの電圧信号のレベルを判定し電路１０の漏電を検出する漏電検出回路４６と、この漏電検出回路４６の出力を増幅する出力回路４７を有し、漏電検出回路４６が漏電を検出したときに、出力回路４７により漏電表示ＬＥＤ４８を点灯させるとともに、漏電警報出力リレー４９を駆動する。 Embodiment 1 FIG.
1 is a circuit diagram including a leakage relay in Embodiment 1 of the present invention.
The earth leakage relay 40 is provided in the electric circuit 10 of the main circuit, and is connected to both ends of the zero-phase current transformer 20 that detects the zero-phase current in the electric circuit 10 via the connection lead wires 30. A detection resistor 42 for converting the output current of the current into a voltage signal, a leakage detection circuit 46 for determining the level of the voltage signal from the detection resistor 42 and detecting leakage in the electric circuit 10, and an output of the leakage detection circuit 46 is amplified. When the leakage detection circuit 46 detects a leakage, the output circuit 47 turns on the leakage display LED 48 and drives the leakage alarm output relay 49.

そして、漏電リレー４０は、検出抵抗４２を一辺とし、他の３辺を抵抗４３，４４，４５で形成したホイートストンブリッジ４１を備え、零相変流器２０が接続されている場合、ホイートストンブリッジ４１の検出抵抗側中点Ａの電位が他方の中点Ｂの電位より低くなり、Ａ点電位＜Ｂ点電位の関係となるよう抵抗４３，４４，４５の抵抗値が設定されている。すなわち、この発明においては、ホイートストンブリッジ４１を零相変流器２０と漏電検出回路４０の間に介在させ、通常のホイートストンブリッジでは、未知の抵抗を測定するために検流計に流れる電流が零になるよう可変抵抗を調整しているのに対し、検流計が接続される中点Ａ，Ｂに所定の電位差を発生させるように抵抗４３，４４，４５の抵抗値が設定されている。   And the earth-leakage relay 40 is equipped with the Wheatstone bridge 41 which made the detection resistance 42 one side, and formed the other three sides with resistance 43,44,45, and when the zero phase current transformer 20 is connected, the Wheatstone bridge 41 is provided. The resistance values of the resistors 43, 44, and 45 are set so that the potential at the detection resistor side midpoint A becomes lower than the potential at the other midpoint B and the relationship of the A point potential <the B point potential. That is, in the present invention, the Wheatstone bridge 41 is interposed between the zero-phase current transformer 20 and the leakage detection circuit 40, and in a normal Wheatstone bridge, the current flowing through the galvanometer is zero in order to measure the unknown resistance. The resistance values of the resistors 43, 44, and 45 are set so as to generate a predetermined potential difference at the midpoints A and B to which the galvanometer is connected.

更に、ホイートストンブリッジ４１の中点Ａ，Ｂには、両者の電位を比較する比較回路５０が設けられ、Ａ点電位＜Ｂ点電位の関係にある場合には、比較回路５０が所定出力を発生することによりトランジスタ５１がオンとなり、このトランジスタ５１を介してテストボタン５２と、このテストボタン５２の押動操作により付勢されテスト用模擬波形を発生する模擬波形発生回路５３が漏電検出回路４６の入力に接続されるように構成されている。
なお、漏電リレー４０には、内部の各回路に所定電圧を供給するための電源回路５４が含まれている。 Further, a comparison circuit 50 for comparing the potentials of the Wheatstone bridge 41 is provided at the midpoints A and B. When the relationship of the A point potential <the B point potential, the comparison circuit 50 generates a predetermined output. As a result, the transistor 51 is turned on, and the test button 52 via the transistor 51 and the simulated waveform generating circuit 53 that is energized by the pressing operation of the test button 52 to generate a test simulated waveform are It is configured to be connected to the input.
The earth leakage relay 40 includes a power circuit 54 for supplying a predetermined voltage to each internal circuit.

この実施の形態１による漏電リレー４０は、上記のように零相変流器２０が接続されている場合、ホイートストンブリッジ４１においてＡ点電位＜Ｂ点電位の関係となるよう抵抗４３，４４，４５の抵抗値が設定されているので、このとき比較回路５０の出力によりトランジスタ５１がオンとなり、模擬波形発生回路５３が漏電検出回路４６の入力に接続され、テスト用模擬波形を漏電検出回路４６に注入する。
したがって、零相変流器２０が正常に漏電リレー４０に接続されている場合、テストボタン５２の押動操作によって、漏電検出回路４６が正常であることが確認できる。 In the earth leakage relay 40 according to the first embodiment, when the zero-phase current transformer 20 is connected as described above, the resistors 43, 44, and 45 have a relationship of A point potential <B point potential in the Wheatstone bridge 41. Therefore, at this time, the transistor 51 is turned on by the output of the comparison circuit 50, the simulated waveform generation circuit 53 is connected to the input of the leakage detection circuit 46, and the simulated waveform for testing is supplied to the leakage detection circuit 46. inject.
Therefore, when the zero-phase current transformer 20 is normally connected to the leakage relay 40, it is possible to confirm that the leakage detection circuit 46 is normal by pushing the test button 52.

また、零相変流器２０が未接続または接続リード線３０の断線があった場合、ホイートストンブリッジ４１においてＡ点電位＞Ｂ点電位となり、比較回路５０によりトランジスタ５１がオフとなり、模擬波形発生回路５３が漏電検出回路４６の入力から切断される。
したがって、テストボタン５２を操作しても漏電リレー４０は動作しないことから、零相変流器２０との接続、あるいは零相変流器２０に異常があることが確認できる。 When the zero-phase current transformer 20 is not connected or the connection lead wire 30 is disconnected, the A point potential> the B point potential in the Wheatstone bridge 41, the transistor 51 is turned off by the comparison circuit 50, and the simulated waveform generating circuit 53 is disconnected from the input of the leakage detection circuit 46.
Therefore, even if the test button 52 is operated, the earth leakage relay 40 does not operate, so it can be confirmed that there is an abnormality in the connection with the zero-phase current transformer 20 or the zero-phase current transformer 20.

以上のようにこの実施の形態１の漏電リレーによれば、漏電検出回路４６と零相変流器２０との間に設けられ、零相変流器２０の検出電流を電圧信号に変換する検出抵抗４２を一辺とする４辺の抵抗からなるホイートストンブリッジ４１と、このホイートストンブリッジ４１の中点Ａ，Ｂ間の電位を比較する比較回路５０と、この比較回路５０が所定出力を発生している状態で、テストボタン５２の操作に応じて付勢され、テスト用模擬波形を漏電検出回路４６に注入する模擬波形発生回路５３とを備え、ホイートストンブリッジ４１は、零相変流器２０が正常に接続されている場合、中点Ａ，Ｂ間に、比較回路５０が所定出力を発生するような電位差を生じるように設定されているので、零相変流器から漏電検出回路の信号ラインにｂ接点のスイッチを用いることなく、テストボタンの操作により、漏電リレー内部の故障有無はもとより、零相変流器との接続の異常有無、さらには零相変流器そのものの故障有無が確認でき、確実な漏電監視を実行する信頼性の高い漏電リレーを実現することができる。   As described above, according to the leakage relay of the first embodiment, detection is provided between the leakage detection circuit 46 and the zero-phase current transformer 20 and converts the detected current of the zero-phase current transformer 20 into a voltage signal. A Wheatstone bridge 41 composed of four resistances with the resistor 42 as one side, a comparison circuit 50 that compares the potential between the midpoints A and B of the Wheatstone bridge 41, and the comparison circuit 50 generate a predetermined output. And a simulated waveform generating circuit 53 that is energized in response to the operation of the test button 52 and injects a simulated waveform for testing into the leakage detection circuit 46. In the Wheatstone bridge 41, the zero-phase current transformer 20 operates normally. When connected, since the comparison circuit 50 is set so as to generate a potential difference between the midpoints A and B so as to generate a predetermined output, the zero-phase current transformer is connected to the signal line of the leakage detection circuit b. contact By using the test button without using a switch, it is possible to check whether there is a fault inside the ground fault relay, whether there is an abnormality in the connection with the zero-phase current transformer, and whether there is a fault in the zero-phase current transformer itself. It is possible to realize a highly reliable leakage relay that performs leakage monitoring.

実施の形態２．
図２はこの発明の実施の形態２を示す回路図である。
上記実施の形態１は、ホイートストンブリッジ４１の中点Ａ，Ｂ間の電位を比較する比較回路５０の出力によりテスト用の模擬波形を発生する模擬波形発生回路５３を制御するものであったが、テストボタン５２の操作で漏電リレー４０が動作しない場合、零相変流器２０の接続、あるいは漏電検出回路４６のいずれかに異常があるか不明である。
このため、この実施の形態２では、零相変流器２０が未接続である場合（零相変流器２０の接続リード線３０に断線がある場合も含む）、ホイートストンブリッジ４１の中点Ａ，Ｂ間の電位がＡ点電位＞Ｂ点電位となり、比較回路５０が所定出力を発生するように設定したものである。 Embodiment 2. FIG.
FIG. 2 is a circuit diagram showing Embodiment 2 of the present invention.
In the first embodiment, the simulated waveform generating circuit 53 that generates the simulated waveform for testing is controlled by the output of the comparison circuit 50 that compares the potential between the midpoints A and B of the Wheatstone bridge 41. When the leakage relay 40 does not operate due to the operation of the test button 52, it is unknown whether there is an abnormality in either the connection of the zero-phase current transformer 20 or the leakage detection circuit 46.
Therefore, in the second embodiment, when the zero-phase current transformer 20 is not connected (including the case where the connection lead wire 30 of the zero-phase current transformer 20 is disconnected), the midpoint A of the Wheatstone bridge 41 is , B is set such that A point potential> B point potential, and the comparison circuit 50 generates a predetermined output.

そして、比較回路５０の出力により出力回路を形成するトランジスタ５５，５６をオンさせ、異常表示ＬＥＤ５７を点灯させるとともに、異常警報出力リレー５８を駆動させることにより、零相変流器２０の接続に異常があることを知らせる。
なお、この異常表示ＬＥＤ５７が点灯せず、さらにテストボタン５２を操作しても、漏電表示ＬＥＤ４８が点灯しない場合、漏電検出回路４６以降に異常が認められると判断できる。 Then, the transistors 55 and 56 forming the output circuit are turned on by the output of the comparison circuit 50, the abnormality display LED 57 is turned on, and the abnormality alarm output relay 58 is driven, whereby the connection of the zero-phase current transformer 20 is abnormal. Inform that there is.
If the abnormality display LED 57 is not lit and the leakage indicator LED 48 is not lit even if the test button 52 is operated, it can be determined that an abnormality is recognized after the leakage detection circuit 46.

以上のようにこの実施の形態２の漏電リレーによれば、漏電検出回路４６と零相変流器２０との間に設けられ、零相変流器２０の検出電流を電圧信号に変換する検出抵抗４２を一辺とする４辺の抵抗からなるホイートストンブリッジ４１と、このホイートストンブリッジ４１の中点Ａ，Ｂ間の電位を比較する比較回路５０と、この比較回路５０が所定出力を発生した時に付勢される警報出力回路１０とを備え、ホイートストンブリッジ４１は、零相変流器２０が未接続である場合、中点Ａ，Ｂ間に、比較回路５０が所定出力を発生するような電位差を生じるように設定されているので、零相変流器から漏電検出回路の信号ラインにｂ接点のスイッチを用いることなく、テストボタンの操作による漏電リレー内部の故障有無の確認に加え、零相変流器との接続の異常有無、さらには零相変流器そのものの故障有無が確認でき、確実な漏電監視を実行する信頼性の高い漏電リレーを実現することができる。   As described above, according to the leakage relay of the second embodiment, detection is provided between the leakage detection circuit 46 and the zero-phase current transformer 20 and converts the detected current of the zero-phase current transformer 20 into a voltage signal. A Wheatstone bridge 41 consisting of four resistances with one side of the resistor 42, a comparison circuit 50 for comparing the potential between the midpoints A and B of the Wheatstone bridge 41, and when the comparison circuit 50 generates a predetermined output. The Wheatstone bridge 41 has a potential difference that causes the comparison circuit 50 to generate a predetermined output between the middle points A and B when the zero-phase current transformer 20 is not connected. Since it is set to occur, in addition to confirming whether there is a fault inside the leakage relay by operating the test button without using the b-contact switch on the signal line of the leakage detection circuit from the zero-phase current transformer, Abnormality presence or absence of connection of the flow circuit, and further can be a failure existence of zero-phase current transformer itself can be confirmed, to achieve a high leakage relay reliable to perform a reliable leakage monitoring.

この発明の実施の形態１における漏電リレーを含む回路図である。It is a circuit diagram containing the earth-leakage relay in Embodiment 1 of this invention. この発明の実施の形態２における漏電リレーを含む回路図である。It is a circuit diagram containing the earth-leakage relay in Embodiment 2 of this invention.

符号の説明Explanation of symbols

１０ 電路
２０ 零相変流器
３０ 接続リード線
４０ 漏電リレー
４１ ホイートストンブリッジ
４２ 検出抵抗
４３〜４５ 抵抗
４６ 漏電検出回路
４７ 出力回路
４８ 漏電表示ＬＥＤ
４９ 漏電警報出力リレー
５０ 比較回路
５１ トランジスタ
５２ テストボタン
５３ 模擬波形発生回路
５４ 電源回路
５５，５６ トランジスタ
５７ 異常表示ＬＥＤ
５８ 異常警報出力リレー DESCRIPTION OF SYMBOLS 10 Electric circuit 20 Zero phase current transformer 30 Connection lead wire 40 Earth leakage relay 41 Wheatstone bridge 42 Detection resistance 43-45 Resistance 46 Earth leakage detection circuit 47 Output circuit 48 Earth leakage display LED
49 Leakage alarm output relay 50 Comparison circuit 51 Transistor 52 Test button 53 Simulated waveform generation circuit 54 Power supply circuit 55, 56 Transistor 57 Error indication LED
58 Abnormal alarm output relay

Claims (6)

電路の零相電流を検出する零相変流器と接続され、その検出電流に基づいて電路の漏電状態を監視する漏電リレーにおいて、
上記零相変流器の検出電流を電圧信号に変換する検出抵抗と、
上記電圧信号のレベルを判定し上記電路の漏電を検出する漏電検出回路と、
この漏電検出回路と上記零相変流器との間に設けられ、上記検出抵抗を一辺とする４辺の抵抗からなるホイートストンブリッジと、
このホイートストンブリッジの中点間の電位を比較する比較回路と、
この比較回路が所定出力を発生している状態で、テストボタンの操作に応じて付勢され、テスト用の模擬波形を上記漏電検出回路に注入する模擬波形発生回路とを備え、
上記ホイートストンブリッジは、上記零相変流器が正常に接続されている場合、上記中点間に、上記比較回路が上記所定出力を発生するような電位差を生じるように設定されている
ことを特徴とする漏電リレー。 In the leakage relay that is connected to the zero-phase current transformer that detects the zero-phase current of the circuit, and monitors the leakage status of the circuit based on the detected current,
A detection resistor for converting the detection current of the zero-phase current transformer into a voltage signal;
A leakage detection circuit for determining a level of the voltage signal and detecting a leakage of the electric circuit;
A Wheatstone bridge, which is provided between the leakage detection circuit and the zero-phase current transformer, and includes four-side resistances with the detection resistance as one side;
A comparison circuit that compares the potential between the midpoints of the Wheatstone bridge;
In a state where this comparison circuit is generating a predetermined output, it is energized according to the operation of the test button, and includes a simulated waveform generating circuit that injects a simulated waveform for testing into the leakage detection circuit,
The Wheatstone bridge is set such that when the zero-phase current transformer is normally connected, a potential difference is generated between the middle points so that the comparison circuit generates the predetermined output. An earth leakage relay. 上記ホイートストンブリッジは、上記零相変流器が正常に接続されている場合に、上記検出抵抗側中点の電位が他方の中点の電位より低くなるように設定されていることを特徴とする請求項１記載の漏電リレー。   The Wheatstone bridge is set such that when the zero-phase current transformer is normally connected, the potential at the midpoint of the detection resistor is lower than the potential of the other midpoint. The earth leakage relay according to claim 1. 上記漏電検出回路は、漏電検出時に漏電表示素子を駆動すると共に、漏電警報出力リレーを駆動することを特徴とする請求項１記載の漏電リレー。   The earth leakage relay according to claim 1, wherein the earth leakage detection circuit drives an earth leakage display element and detects an earth leakage alarm output relay when earth leakage is detected. 電路の零相電流を検出する零相変流器と接続され、その検出電流に基づいて電路の漏電状態を監視する漏電リレーにおいて、
上記零相変流器の検出電流を電圧信号に変換する検出抵抗と、
上記電圧信号のレベルを判定し上記電路の漏電を検出する漏電検出回路と、
テストボタンの操作に応じて付勢され、テスト用の模擬波形を上記漏電検出回路に注入する模擬波形発生回路と、
上記漏電検出回路と上記零相変流器との間に設けられ、上記検出抵抗を一辺とする４辺の抵抗からなるホイートストンブリッジと、
このホイートストンブリッジの中点間の電位を比較する比較回路と、
この比較回路が所定出力を発生した時に付勢される警報出力回路とを備え、
上記ホイートストンブリッジは、上記零相変流器が未接続である場合、上記中点間に、上記比較回路が上記所定出力を発生するような電位差を生じるように設定されている
ことを特徴とする漏電リレー。 In the leakage relay that is connected to the zero-phase current transformer that detects the zero-phase current of the circuit, and monitors the leakage status of the circuit based on the detected current,
A detection resistor for converting the detection current of the zero-phase current transformer into a voltage signal;
A leakage detection circuit for determining a level of the voltage signal and detecting a leakage of the electric circuit;
A simulated waveform generating circuit that is energized according to the operation of the test button and injects a simulated waveform for testing into the leakage detection circuit;
A Wheatstone bridge, which is provided between the leakage detection circuit and the zero-phase current transformer, and includes four-side resistors having the detection resistor as one side;
A comparison circuit that compares the potential between the midpoints of the Wheatstone bridge;
An alarm output circuit energized when the comparison circuit generates a predetermined output,
The Wheatstone bridge is set such that when the zero-phase current transformer is not connected, a potential difference is generated between the midpoints so that the comparison circuit generates the predetermined output. Earth leakage relay. 上記ホイートストンブリッジは、上記零相変流器が正常に接続されている場合に、上記検出抵抗側中点の電位が他方の中点の電位より高くなるように設定されていることを特徴とする請求項４記載の漏電リレー。   The Wheatstone bridge is set such that, when the zero-phase current transformer is normally connected, the potential of the midpoint of the detection resistor is higher than the potential of the other midpoint. The earth leakage relay according to claim 4. 上記警報出力回路は、異常表示素子を駆動することを特徴とする請求項４記載の漏電リレー。   5. The leakage relay according to claim 4, wherein the alarm output circuit drives an abnormality display element.
JP2007042132A 2007-02-22 2007-02-22 Earth leakage relay Expired - Fee Related JP4869103B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009142021A (en) * 2007-12-05 2009-06-25 Mitsubishi Electric Corp Leakage relay
JP2010146803A (en) * 2008-12-17 2010-07-01 Mitsubishi Electric Corp Ground fault interrupter
CN104466904A (en) * 2013-09-25 2015-03-25 深圳市海洋王照明工程有限公司 Protection circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6168566A (en) * 1984-09-11 1986-04-08 Yanmar Diesel Engine Co Ltd Electromagnetic pickup disconnection diagnosing circuit for revolutions measuring apparatus
JPS62873A (en) * 1985-06-26 1987-01-06 Matsushita Electric Ind Co Ltd Detecting circuit for breaking of wire
JPH08162332A (en) * 1994-12-07 1996-06-21 Meidensha Corp Wiring breaking test circuit for instrument current transformer
JP2002044856A (en) * 2000-07-25 2002-02-08 Mitsubishi Electric Corp Leakage current relay

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003045312A (en) * 2001-07-26 2003-02-14 Mitsubishi Electric Corp Ground-fault circuit interrupter
CN2590235Y (en) * 2002-11-05 2003-12-03 高翔凌 Electric leakage circuit breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6168566A (en) * 1984-09-11 1986-04-08 Yanmar Diesel Engine Co Ltd Electromagnetic pickup disconnection diagnosing circuit for revolutions measuring apparatus
JPS62873A (en) * 1985-06-26 1987-01-06 Matsushita Electric Ind Co Ltd Detecting circuit for breaking of wire
JPH08162332A (en) * 1994-12-07 1996-06-21 Meidensha Corp Wiring breaking test circuit for instrument current transformer
JP2002044856A (en) * 2000-07-25 2002-02-08 Mitsubishi Electric Corp Leakage current relay

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009142021A (en) * 2007-12-05 2009-06-25 Mitsubishi Electric Corp Leakage relay
JP2010146803A (en) * 2008-12-17 2010-07-01 Mitsubishi Electric Corp Ground fault interrupter
CN104466904A (en) * 2013-09-25 2015-03-25 深圳市海洋王照明工程有限公司 Protection circuit
CN104466904B (en) * 2013-09-25 2018-11-27 深圳市海洋王照明工程有限公司 A kind of protection circuit

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