JP2005158559A - Earth leakage breaker - Google Patents
Earth leakage breaker Download PDFInfo
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- JP2005158559A JP2005158559A JP2003396858A JP2003396858A JP2005158559A JP 2005158559 A JP2005158559 A JP 2005158559A JP 2003396858 A JP2003396858 A JP 2003396858A JP 2003396858 A JP2003396858 A JP 2003396858A JP 2005158559 A JP2005158559 A JP 2005158559A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/334—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control
- H02H3/335—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control the main function being self testing of the device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
- H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Breakers (AREA)
Abstract
Description
この発明は、電動機、その他各種の負荷の接続された配電系統に発生する漏電を検出して波及事故を未然に防ぐための漏電遮断器、特にそのテスト回路の改良に関するものである。 The present invention relates to an earth leakage breaker for detecting an electric leakage generated in a power distribution system connected to an electric motor and other various loads to prevent a ripple accident, and particularly to an improvement of a test circuit thereof.
漏電遮断器における動作テストを正確に行なうために、従来から漏電遮断器の漏電テスト回路は種々工夫されている。その一つの例が、特許文献１に示されている。この特許文献1に示された漏電遮断器の構成を図７に示す。 In order to accurately perform the operation test in the earth leakage breaker, various earth leakage test circuits for the earth leakage breaker have been conventionally devised. One example is shown in Patent Document 1. FIG. 7 shows the configuration of the earth leakage circuit breaker disclosed in Patent Document 1.
図7の漏電遮断器は、複数の定格電圧、例えば、100，200および400Ｖの３つの定格電圧を有するものである。図示された漏電遮断器１は、電源側接続端子３Ａおよび負荷側接続端子３Ｂを有し、この接続端子３Ａ、３Ｂ間を接続する主回路内に負荷電流を開閉する複数極の開閉部８が設けられている。開閉部８と負荷側端子３Ｂとを結ぶ主回路導体２の挿通された零相変流器５は、負荷側端子３Ｂに接続された負荷回路における漏電電流を検出する。漏電検出回路６が零相変流器５の漏電検出巻線５１の出力電流から漏電の有無を判定し、漏電の発生が検出されたとき引外し装置７に駆動信号を出力する。引外し装置７は、漏電検出回路６から駆動信号が与えられると、開閉部８の図示しない投入機構を引外し、閉極されている開閉部接点を開極させて負荷回路を遮断する。漏電検出回路６へは主回路２から電源回路４を介して給電される。 7 has a plurality of rated voltages, for example, three rated voltages of 100, 200 and 400V. The earth leakage circuit breaker 1 shown in the figure has a power supply side connection terminal 3A and a load side connection terminal 3B, and a multipolar switching unit 8 for opening and closing a load current in a main circuit connecting the connection terminals 3A and 3B. Is provided. The zero-phase current transformer 5 through which the main circuit conductor 2 connecting the switching unit 8 and the load side terminal 3B is inserted detects a leakage current in the load circuit connected to the load side terminal 3B. The leakage detection circuit 6 determines the presence or absence of leakage from the output current of the leakage detection winding 51 of the zero-phase current transformer 5, and outputs a drive signal to the trip device 7 when the occurrence of leakage is detected. When receiving a drive signal from the leakage detection circuit 6, the tripping device 7 trips a closing mechanism (not shown) of the switching unit 8 and opens a closed switching unit contact to interrupt the load circuit. Power is supplied to the leakage detection circuit 6 from the main circuit 2 through the power supply circuit 4.
テスト回路９は、動作テスト時にテスト回路を閉成して主回路２から零相変流器５のテスト巻線５２にテスト電流を供給するテストスイッチ９１とテスト電流を制限する３個の制限抵抗素子921〜923と、これらの抵抗素子を選択する選択スイッチ９３とで構成される。 The test circuit 9 closes the test circuit during an operation test and supplies a test current from the main circuit 2 to the test winding 52 of the zero-phase current transformer 5 and three limiting resistors for limiting the test current. It comprises elements 921 to 923 and a selection switch 93 for selecting these resistance elements.
定格電圧が100Ｖから400Ｖに変化してもテスト回路９におけるテスト電流が一定の電流となるようにしておくと、漏電検出回路６の検出感度を一定にして漏電テストを行なうことができるため、漏電テストが正確となり、その信頼性を高めることができる。このために、この漏電遮断器においては、電流制限抵抗素子921,922、および923それぞれの抵抗値が、定格電圧が変化してもテスト巻線５２に供給されるテスト電流が一定となるように100Ｖ、200Ｖおよび400Ｖの定格電圧に対応した値に設定され、使用する定格電圧に応じて選択スイッチ９３により電流制限抵抗素子921〜923のうちの１つを選択できるようにしている。
このようなテスト回路を備えた漏電遮断器においては、使用する定格電圧が100Ｖから400Ｖの間で変化しても、そのときの定格電圧に応じて選択スイッチ９３を操作して対応する抵抗素子を選択することによりテスト回路９から零相変流器５のテスト巻線５２に供給されるテスト電流を一定にすることができるため、テストを正確に安定的に行なうことができる。 In the earth leakage breaker equipped with such a test circuit, even if the rated voltage to be used changes between 100 V and 400 V, the corresponding resistance element is operated by operating the selection switch 93 according to the rated voltage at that time. By selecting, the test current supplied from the test circuit 9 to the test winding 52 of the zero-phase current transformer 5 can be made constant, so that the test can be performed accurately and stably.
しかしながら、このような従来装置においては、使用する定格電圧の種類に対応する個数の電流制限抵抗素子と選択スイッチを設ける必要があるため、テスト回路の設置スペースが大きくなることおよび部品点数の増加により製造コストが高くなることなどの問題が生じる。 However, in such a conventional device, it is necessary to provide a number of current limiting resistor elements and selection switches corresponding to the type of rated voltage to be used, which increases the installation space of the test circuit and the number of parts. Problems such as high manufacturing costs arise.
そして、特に定格電圧の高いところでは、テストスイッチの開放時に接点間に常時大きな電圧が加わるため、このテストスイッチの接点間隔を大きくして耐電圧を高くする必要があるため、このスイッチが大形となる問題もある。 And especially in places where the rated voltage is high, a large voltage is constantly applied between the contacts when the test switch is opened, so it is necessary to increase the withstand voltage by increasing the contact distance of the test switch. There is also a problem.
この発明は、このような問題点を解消するため、小形で設置スペースの小さなテスト回路を備え、また正確な漏電テストを行なうことのできる漏電遮断器を提供することを課題とするものである。 In order to solve such problems, it is an object of the present invention to provide a ground fault circuit breaker that is provided with a small test circuit having a small installation space and that can perform an accurate ground fault test.
前記のような課題を解決するため、この発明は、主回路を開閉する開閉部と、主回路の全相の導体が挿通された零相変流器と、この零相変流器の漏電検出巻線の出力電流から漏電の発生の有無を判定する漏電検出回路と、この漏電検出回路の漏電の発生を示す出力信号により前記開閉部を引外して遮断する引外し装置と、前記漏電検出回路へ電力を供給する電源回路と、前記零相変流器のテスト巻線にテスト電流を供給するテストスイッチと電流制限抵抗素子を有するテスト回路とを備えた漏電遮断器において、前記電源回路を主回路から供給される交流電流を直流電流に変換し、漏電検出回路へ一定の直流電流を供給する定電流回路で構成し、主回路とこの定電流回路の交流入力端とを結ぶ回路に直列にテスト抵抗素子を設け、この抵抗素子の両端にテストスイッチを介して前記零相変流器のテスト巻線を接続したことを特徴とする。 In order to solve the above-described problems, the present invention provides an open / close unit that opens and closes a main circuit, a zero-phase current transformer through which all phase conductors of the main circuit are inserted, and leakage detection of the zero-phase current transformer A leakage detection circuit that determines whether or not leakage has occurred from the output current of the winding, a tripping device that trips and shuts off the open / close portion by an output signal indicating the occurrence of leakage in the leakage detection circuit, and the leakage detection circuit A ground fault circuit breaker comprising: a power supply circuit for supplying power to the power supply; a test switch for supplying a test current to a test winding of the zero-phase current transformer; and a test circuit having a current limiting resistance element. It is composed of a constant current circuit that converts alternating current supplied from the circuit into direct current and supplies a constant direct current to the leakage detection circuit, and is connected in series to the circuit connecting the main circuit and the alternating current input terminal of this constant current circuit. A test resistance element is provided. Both ends via the test switch, characterized in that to connect the test winding of the residual current transformer.
前記の発明においては、前記テスト抵抗素子の抵抗値を前記定電流回路の内部インピーダンスよりも小さな値とするのがよく、また、前記電源回路交流入力側に入力抵抗素子を設けるようにしてもよい。 In the above invention, the resistance value of the test resistance element may be smaller than the internal impedance of the constant current circuit, and an input resistance element may be provided on the power supply circuit AC input side. .
さらに、前記テスト抵抗素子の両端に定電圧ダイオードを２個逆直列に接続することことによりテスト抵抗素子の端子電圧を制限することができる。 Further, the terminal voltage of the test resistance element can be limited by connecting two constant voltage diodes in anti-series at both ends of the test resistance element.
また、第２の発明は、前記漏電遮断器における漏電検出回路にこの漏電検出回路の検出感度を設定するする感度設定回路が付設されている場合は、前記テストスイッチと連動して前記感度設定回路の設定に関係なく予め決められた感度に設定する手段を設けることを特徴とする。 According to a second aspect of the present invention, in the case where a sensitivity setting circuit for setting the detection sensitivity of the leakage detection circuit is attached to the leakage detection circuit in the leakage breaker, the sensitivity setting circuit is linked with the test switch. Means is provided for setting the sensitivity to a predetermined value regardless of the setting.
さらに、第３の発明は、前記漏電遮断器における漏電検出回路にこの漏電検出回路の動作時間を設定するする動作時間設定回路が付設されている場合は、前記テストスイッチと連動して前記動作時間設定回路の設定に関係なく予め決められた動作時間に設定する手段を設けることを特徴とする。 Furthermore, in the third aspect of the present invention, when an operation time setting circuit for setting an operation time of the leakage detection circuit is attached to the leakage detection circuit in the leakage breaker, the operation time is interlocked with the test switch. Means is provided for setting the operation time to a predetermined time regardless of the setting of the setting circuit.
この発明においては、電源回路に定電流回路を設けているため、この電源回路の交流入力端に直列に挿入されたテスト抵抗素子には、定格電圧の大きさにかかわらず一定の電流が流れるので、両端電圧が一定となり、テスト時には、定格電圧の大きさにかかわらずテスト抵抗装置素子の両端から零相変流器のテスト巻線に一定の電圧が印加され一定のテスト電流が供給されるようになる。このため、この発明によれば、１個のテスト抵抗素子によって、零相変流器に定格電圧の大きさに関係なく常に一定のテスト電流を供給できるので、漏電テストを正確に安定して行なうことができ、テスト抵抗素子の使用個数が減った分、テスト回路の設置スペースを縮小できる効果が得られる。そして、テスト抵抗素子の抵抗値を定電流回路の内部インピーダンスより小さく選ぶことによりテスト抵抗素子の負担電圧を低くすることができるので、テストスイッチの開放時の接点間電圧が低くなり、接点間隔を小さくすることでき、このスイッチを小形にすることが可能となる効果も得られる。 In the present invention, since a constant current circuit is provided in the power supply circuit, a constant current flows through the test resistance element inserted in series at the AC input terminal of the power supply circuit regardless of the magnitude of the rated voltage. The voltage at both ends is constant, and at the time of testing, a constant voltage is applied to the test winding of the zero-phase current transformer from both ends of the test resistor device regardless of the magnitude of the rated voltage so that a constant test current is supplied. become. Therefore, according to the present invention, a constant test current can be always supplied to the zero-phase current transformer regardless of the magnitude of the rated voltage by one test resistance element, so that the leakage test is performed accurately and stably. As a result, it is possible to reduce the installation space of the test circuit as the number of test resistor elements used is reduced. And by selecting the resistance value of the test resistance element to be smaller than the internal impedance of the constant current circuit, the burden voltage of the test resistance element can be lowered. It is possible to reduce the size of the switch, and it is possible to obtain an effect that enables the switch to be downsized.
そして、漏電検出回路にその検出感度を設定する感度設定回路または、動作時間を設定する動作時間設定回路が付設されている場合には、テストスイッチと連動して、前期感度設定回路または動作時間設定回路の設定に関係なく予め決められた感度または動作時間を設定する手段を設けることにより、漏電テストのとき、漏電検出回路の検出感度または動作時間が常に一定の設定値とすることができるため動作テストを正確に安定的に行なうことができる効果がある。 If the leakage detection circuit is provided with a sensitivity setting circuit that sets the detection sensitivity or an operation time setting circuit that sets the operation time, the sensitivity setting circuit or operation time setting for the previous period is linked with the test switch. By providing a means to set a predetermined sensitivity or operating time regardless of the circuit setting, the detection sensitivity or operating time of the leakage detection circuit can always be set to a constant value during a leakage test. There is an effect that the test can be performed accurately and stably.
以下に、この発明を図に示す実施例について説明する。 The present invention will be described below with reference to embodiments shown in the drawings.
図１は、この発明の第１の実施例を示す構成図である。 FIG. 1 is a block diagram showing a first embodiment of the present invention.
図１において、１は漏電遮断器であり、通常は構成要素のすべてが絶縁樹脂製のモールドケース内に収納され、コンパクトに形成されている。この漏電遮断器１は、電源側接続端子３Ａと負荷側接続端子３Ｂとを接続する主回路２、この主回路２を開閉する開閉部８、主回路２の全相の導体が挿通され、主回路に流れる漏電電流を検出する零相変流器５、この零相変流器５の漏電検出巻線５１の検出電流を監視して漏電の有無を判定する漏電検出回路６、この漏電検出回路６の漏電を示す出力信号により前記開閉部８の投入機構を引外して開閉部を遮断する引外し装置７および前記漏電検出回路６に動作電力を供給する電源回路４とを備えている。 In FIG. 1, reference numeral 1 denotes an earth leakage circuit breaker. Normally, all of the components are housed in a mold case made of insulating resin and are compactly formed. The earth leakage circuit breaker 1 includes a main circuit 2 for connecting the power supply side connection terminal 3A and the load side connection terminal 3B, an open / close unit 8 for opening and closing the main circuit 2, and conductors of all phases of the main circuit 2 inserted therethrough. A zero-phase current transformer 5 for detecting a leakage current flowing in the circuit, a leakage detection circuit 6 for monitoring the detection current of the leakage detection winding 51 of the zero-phase current transformer 5 and determining the presence or absence of the leakage, and this leakage detection circuit 6 is provided with a tripping device 7 that trips the closing mechanism of the switching unit 8 by an output signal indicating leakage of the circuit 6 and shuts off the switching unit, and a power supply circuit 4 that supplies operating power to the leakage detection circuit 6.
前記電源回路４は、主回路２から給電される交流電力を整流して直流電力に変換する整流回路４１と、整流回路４１の出力電流を所定の一定電流に制御する定電流回路とで構成される。そしてこの電源回路４の主回路２に接続される交流入力側に直列にテスト抵抗素子１１を接続し、このテスト抵抗素子１１の両端にテストスイッチ１２を直列に介して零相変流器５に設けられたテスト巻線５２を接続し、テスト抵抗素子１１、テストスイッチ１２およびテスト巻線５２によりテスト回路１０を構成する。 The power supply circuit 4 includes a rectifier circuit 41 that rectifies AC power fed from the main circuit 2 and converts it into DC power, and a constant current circuit that controls the output current of the rectifier circuit 41 to a predetermined constant current. The A test resistance element 11 is connected in series to the AC input side connected to the main circuit 2 of the power supply circuit 4, and a test switch 12 is connected in series to both ends of the test resistance element 11 to the zero-phase current transformer 5. The provided test winding 52 is connected, and the test resistance element 11, the test switch 12 and the test winding 52 constitute the test circuit 10.
前記電源回路４における定電流回路４２の具体的構成を図２に示す。 A specific configuration of the constant current circuit 42 in the power supply circuit 4 is shown in FIG.
図２において、定電流回路４２を構成するトランジスタＴｒ1は、そのコレクタが整流回路４１の出力に接続され、エミッタが抵抗ｒ2を介して負荷回路に接続され、そしてコレクタ−ベース間に抵抗ｒ1が接続されている。また、トランジスタＴｒ2は、そのエミッタ−コレクタ回路をトランジスタＴｒ1のベース−エミッタ間に接続し、そのエミッタ−ベース間に抵抗ｒ3を接続している。そしてトランジスタＴｒ2のベースと抵抗ｒ2の負荷回路側端との間に定電圧ダイオードＺＤ1を接続して定電流回路４２が構成される。トランジスタＴr2は、トランジスタＴr1とは異なり、抵抗ｒ1が100ｋΩ以上の高抵抗に選ばれているため、エミッタ−コレクタ間の負担電圧（損失）が低くなり、小容量の素子で十分となる。また、抵抗ｒ3の抵抗値は、トランジスタＴｒ2のエミッタ−コレクタ間のオン抵抗値（１００Ω程度）より十分大きな数１０ｋΩに選ばれているので、この抵抗ｒ3と定電圧ダイオードＺＤ1を介して負荷回路へ流れる電流は無視できるほど小さなものとなる。 In FIG. 2, the transistor Tr 1 constituting the constant current circuit 42 has a collector connected to the output of the rectifier circuit 41, an emitter connected to the load circuit via a resistor r 2 , and a resistor r between the collector and base. 1 is connected. The transistor Tr 2 has its emitter-collector circuit connected between the base and emitter of the transistor Tr 1 and a resistor r 3 connected between the emitter and base. The constant voltage diode ZD 1 is connected between the base of the transistor Tr 2 and the load circuit side end of the resistor r 2 to form a constant current circuit 42. Unlike the transistor Tr 1 , the transistor Tr 2 is selected to have a resistance r 1 of a high resistance of 100 kΩ or higher, so that the burden voltage (loss) between the emitter and the collector is low, and a small-capacity element is sufficient. . The resistance value of the resistor r 3 is selected to be several tens of kΩ, which is sufficiently larger than the on-resistance value (about 100Ω) between the emitter and collector of the transistor Tr 2 , so that the resistance r 3 and the constant voltage diode ZD 1 are used. Thus, the current flowing to the load circuit is negligibly small.
ここで、電流制限抵抗ｒ2には第１のトランジスタＴｒ1のベース側に流れる電流Ｉｂが流入するように第２のトランジスタＴｒ2を追加したため、図３に示すように整流電圧Ｖｉに比例して電流Ｉｂが変化するようになる。これは、トランジスタＴｒ2のベース電位が定電圧ダイオードＺＤ1により一定に保たれているためである。 Here, since the second transistor Tr 2 is added so that the current Ib flowing to the base side of the first transistor Tr 1 flows into the current limiting resistor r 2, it is proportional to the rectified voltage Vi as shown in FIG. As a result, the current Ib changes. This is because the base potential of the transistor Tr 2 is kept constant by the constant voltage diode ZD 1 .
このように、電流Ｉｂが電圧Ｖｉの変化に比例して変化することにより、電流Ｉｂの増加とともに抵抗ｒ1の電圧降下が増大するのでトランジスタＴｒ1のベース電位は、電圧Ｖｉに対して反比例的に低下するため、トランジスタＴｒ1のエミッタ電流Ｉｅは、図３に示すように整流電圧Ｖｉの変化に対して反比例的に変化するようになる。 As described above, since the current Ib changes in proportion to the change of the voltage Vi, the voltage drop of the resistor r 1 increases with the increase of the current Ib. Therefore, the base potential of the transistor Tr 1 is inversely proportional to the voltage Vi. Therefore, the emitter current Ie of the transistor Tr 1 changes in inverse proportion to the change of the rectified voltage Vi as shown in FIG.
このように電流ＩｅとＩｂは、入力の電圧Ｖｉの変化に対して相補的な変化を示すため、ＩｅとＩｂの和となる負荷回路の漏電検出回路６に供給される電流Ｉは、入力電圧Ｖｉの変化に関係なく一定とすることができる。 Thus, since the currents Ie and Ib show a complementary change to the change in the input voltage Vi, the current I supplied to the leakage detection circuit 6 of the load circuit, which is the sum of Ie and Ib, is the input voltage. It can be kept constant regardless of changes in Vi.
このように、電源回路４に定電流回路４２を設けると、使用する定格電圧が変化しても漏電検出回路６に一定電流を供給できるだけでなく、交流入力電流も一定とすることができる。このため、テスト抵抗素子１１の両端の電圧が、主回路２の電圧の変化に関係なく一定に維持される。 As described above, when the constant current circuit 42 is provided in the power supply circuit 4, not only can a constant current be supplied to the leakage detection circuit 6 even if the rated voltage used changes, but also the AC input current can be constant. For this reason, the voltage across the test resistor element 11 is kept constant regardless of the change in the voltage of the main circuit 2.
漏電テストのために、図１および図２におけるテスト回路１０のテストスイッチ１２をオンにすると、テスト抵抗素子１１の両端の電圧が零相変流器５のテスト巻線５２に加わり、この電圧の大きさで決まるテスト電流がこのテスト巻線５２に流れる。テスト抵抗素子１１の両端の電圧は、定電流回路４２の作用により主回路２の電圧の大きさに関係なく一定となるので、使用する定格電圧が変っても一定となるため、使用する定格電圧に関係なく、漏電テスト時に零相変流器５のテスト巻線に供給するテスト電流（模擬漏電電流）が常に一定となるので、漏電検出回路６の動作テストを正確に行なうことができ、漏電テストの信頼性を高めることができる。 When the test switch 12 of the test circuit 10 in FIGS. 1 and 2 is turned on for the leakage test, the voltage across the test resistance element 11 is applied to the test winding 52 of the zero-phase current transformer 5, and this voltage A test current determined by the magnitude flows through the test winding 52. Since the voltage at both ends of the test resistor element 11 is constant regardless of the magnitude of the voltage of the main circuit 2 due to the action of the constant current circuit 42, it is constant even if the rated voltage used is changed. Regardless of the current leakage test, since the test current (simulated leakage current) supplied to the test winding of the zero-phase current transformer 5 is always constant during the leakage test, the operation test of the leakage detection circuit 6 can be accurately performed, Test reliability can be increased.
前記の実施例において、テスト抵抗素子１１の抵抗値を電源回路４の内部インピーダンスよりも十分小さい値に選ぶようにすると、主回路２の定格電圧が400Ｖと高電圧であっても、テスト抵抗素子１１が負担する電圧を数ボルト程度まで小さくすることができるため、テストスイッチ１２の接点間に加わる電圧が低下し、このスイッチの接点間隔を狭めることができ、このスイッチを小形にすることできる。 In the above embodiment, if the resistance value of the test resistor element 11 is selected to be a value sufficiently smaller than the internal impedance of the power supply circuit 4, even if the rated voltage of the main circuit 2 is as high as 400V, the test resistor element Since the voltage borne by 11 can be reduced to about several volts, the voltage applied between the contacts of the test switch 12 is lowered, the contact distance between the switches can be reduced, and the switch can be made compact.
また、漏電検出回路６は、電子回路で構成されるため、その動作電流は数ｍＡ程度であるので、電源回路４の出力電流も数ｍＡの定格でよく、この電源回路に直列に接続されたテスト抵抗素子として定格熱容量の小さい抵抗素子を使用することができ、テスト回路を小形にすることができる。 Further, since the leakage detection circuit 6 is composed of an electronic circuit, its operating current is about several mA, so the output current of the power circuit 4 may be rated at several mA and is connected in series to this power circuit. A resistance element having a small rated heat capacity can be used as the test resistance element, and the test circuit can be miniaturized.
次に、図４にこの発明の第２の実施例の構成を示す。 Next, FIG. 4 shows the configuration of the second embodiment of the present invention.
この実施例２は、電源回路４の整流回路４１の交流入力側の各相に入力抵抗Ｒ1、Ｒ2およびＲ3を挿入している点が、実施例１とは異なるだけでその他の構成は同じである。 The second embodiment is different from the first embodiment only in that the input resistors R 1 , R 2, and R 3 are inserted in the respective phases on the AC input side of the rectifier circuit 41 of the power supply circuit 4. Are the same.
このように、電源回路４に入力抵抗Ｒ1、Ｒ2、Ｒ3を挿入すると、これらの抵抗素子と電源回路４における平滑コンデンサＣ1（図２参照）とでフィルタ回路が形成されるので、これにより比較的周波数の高いサージ電圧を吸収することができるため、電源回路４およびテスト回路１０のテストスイッチ１２のサージ電圧耐量を高めることができる。 Thus, when the input resistors R 1 , R 2 , R 3 are inserted into the power supply circuit 4, a filter circuit is formed by these resistance elements and the smoothing capacitor C 1 (see FIG. 2) in the power supply circuit 4. As a result, a surge voltage having a relatively high frequency can be absorbed, so that the surge voltage tolerance of the power switch 4 and the test switch 12 of the test circuit 10 can be increased.
図５は、この発明の第３の実施例を示す構成図である。 FIG. 5 is a block diagram showing a third embodiment of the present invention.
この図５の実施例３は、テスト抵抗素子１１の両端に２個の定電圧ダイオードＺＤ3とＺＤ4を逆直列に接続し、テスト抵抗素子１１の端子電圧を定電圧ダイオードで決められた一定電圧以下に制限するようにしたものである。テスト抵抗素子１１の抵抗値を下げない場合でも、定電圧ダイオードを設けることにより、両端の電圧を一定値以下に制限できることにより、テストスイッチ１２の交流電圧の負担を低減できるため、その接点間隔をより狭めることができ、スイッチ全体を小形にすることができる。 In the third embodiment shown in FIG. 5, two constant voltage diodes ZD 3 and ZD 4 are connected in reverse series to both ends of the test resistance element 11, and the terminal voltage of the test resistance element 11 is constant determined by the constant voltage diode. The voltage is limited to a voltage or less. Even when the resistance value of the test resistance element 11 is not lowered, by providing the constant voltage diode, the voltage at both ends can be limited to a certain value or less, so that the burden of the AC voltage of the test switch 12 can be reduced. The entire switch can be made smaller.
図６は、この発明の第４の実施例を示すものである。 FIG. 6 shows a fourth embodiment of the present invention.
図６において、６１はセレクタースイッチなどで構成された漏電検出回路６の検出感度設定回路である。この設定回路６１を操作することにより、漏電検出回路６に予め設定された複数の感度の１つを選択して設定することができる。 In FIG. 6, reference numeral 61 denotes a detection sensitivity setting circuit of the leakage detection circuit 6 constituted by a selector switch or the like. By operating the setting circuit 61, one of a plurality of sensitivities preset in the leakage detection circuit 6 can be selected and set.
６２は、この発明にしたがって、設定回路６１を漏電検出回路から切り離すことにより漏電検出回路６の感度設定回路６１の設定に関係なく所定の感度に設定する感度設定スイッチである。このスイッチ６２は、テスト回路１０のテストスイッチ１２と連動しており、テストスイッチ１２がオンされるとオフするように動作する。 62 is a sensitivity setting switch for setting a predetermined sensitivity regardless of the setting of the sensitivity setting circuit 61 of the leakage detection circuit 6 by separating the setting circuit 61 from the leakage detection circuit according to the present invention. The switch 62 is interlocked with the test switch 12 of the test circuit 10 and operates so as to be turned off when the test switch 12 is turned on.
テストスイッチ１２をオンにして、漏電遮断器１の漏電テストを行なうときは、スイッチ６２がオフにされ、感度設定回路６１が漏電検出回路６から切り離されることにより、漏電検出回路６の感度が、テスト回路１０により零相変流器５のテスト巻線５２に供給するテスト電流（模擬漏電電流）に対応した所定の感度に設定される。このため、感度設定回路の設けられた漏電検出回路を有する漏電遮断器であっても、常に漏電検出回路６の検出感度を一定にして漏電テストが実行できるので、漏電テストを正確に行なうことができる。 When the test switch 12 is turned on and the leakage test of the leakage breaker 1 is performed, the switch 62 is turned off and the sensitivity setting circuit 61 is disconnected from the leakage detection circuit 6, thereby reducing the sensitivity of the leakage detection circuit 6. A predetermined sensitivity corresponding to a test current (simulated leakage current) supplied to the test winding 52 of the zero-phase current transformer 5 by the test circuit 10 is set. For this reason, even if the leakage breaker has a leakage detection circuit provided with a sensitivity setting circuit, the leakage detection test can always be performed with the detection sensitivity of the leakage detection circuit 6 kept constant. it can.
図６の漏電遮断器１の漏電検出回路６には、さらに動作時間（漏電検出から出力信号発生までの遅れ時間）を設定する動作時間設定回路６３が付設されている。この動作時間設定回路６３は、短時間のパルス状のノイズ信号等の侵入による誤動作を防止するために設けられたもので、誤動作を防止したいノイズの種類にしたがって、選択スイッチなどによりその動作時間を切り換え設定するものである。 The leakage detection circuit 6 of the leakage breaker 1 of FIG. 6 is additionally provided with an operation time setting circuit 63 for setting an operation time (a delay time from the detection of the leakage to the generation of the output signal). The operation time setting circuit 63 is provided to prevent malfunction due to intrusion of a short-time pulse noise signal or the like. The operation time is set by a selection switch or the like according to the type of noise to be prevented from malfunctioning. It is for switching setting.
この動作時間設定回路６３により動作時間が設定されていると、漏電テストのときのテストスイッチ１２の操作をその設定時間に合わせて行なわないと正確なテストができないことがあるため、テストを行なうときは、予め動作時間設定回路６３による設定時間を調べておく必要がある。この点を改善するために、この発明に従って、動作時間設定回路６３には、この回路を漏電検出回路から切り離し、動作時間設定回路６３の設定に関係なく所定の動作時間に設定することのできる動作時間設定スイッチ６４を付設している。このスイッチ６４は、テスト回路１０のテストスイッチ１２と連動して、このテストスイッチ１２がオンされると、オフされるように構成されている。 When the operation time is set by the operation time setting circuit 63, an accurate test may not be performed unless the test switch 12 is operated in accordance with the set time during the leakage test. Needs to check the set time by the operation time setting circuit 63 in advance. In order to improve this point, according to the present invention, the operation time setting circuit 63 has an operation that can be disconnected from the leakage detection circuit and set to a predetermined operation time regardless of the setting of the operation time setting circuit 63. A time setting switch 64 is provided. The switch 64 is configured to be turned off when the test switch 12 is turned on in conjunction with the test switch 12 of the test circuit 10.
このため、テストスイッチ１２をオンして漏電テストを行なうときは、動作時間設定スイッチ６４がオフし、動作時間設定回路６３が漏電検出回路６から切り離され、動作時間が予め決められた所定の時間に設定される。これにより、漏電テストを常に一定の動作時間で行なうことができるので、正確なテストが可能となる。 For this reason, when the leakage test is performed with the test switch 12 turned on, the operation time setting switch 64 is turned off, the operation time setting circuit 63 is disconnected from the leakage detection circuit 6, and the operation time is set to a predetermined time. Set to As a result, the earth leakage test can always be performed with a constant operation time, so that an accurate test can be performed.
１ ：漏電遮断器
２ ：主回路
３Ａ：電源側接続端子
３Ｂ：負荷側接続端子
４ ：電源回路
４２：定電流回路
５ ：零相変流器
５１：検出巻線
５２：テスト巻線
６ ：漏電検出回路
７ ：引はずし装置
８ ：開閉部
１０：テスト回路
１１：テスト抵抗素子
１２：テストスイッチ
1: Earth leakage breaker 2: Main circuit 3A: Power supply side connection terminal 3B: Load side connection terminal 4: Power supply circuit 42: Constant current circuit 5: Zero phase current transformer 51: Detection winding 52: Test winding 6: Earth leakage Detection circuit 7: Tripping device 8: Opening / closing part 10: Test circuit 11: Test resistance element 12: Test switch
Claims (6)
Open / close unit that opens and closes the main circuit, zero-phase current transformer through which the conductors of all phases of the main circuit are inserted, and whether or not leakage has occurred is determined from the output current of the leakage detection winding of this zero-phase current transformer A leakage detection circuit, an operation time setting circuit for setting an operation time of the leakage detection circuit, a tripping device that trips and shuts off the open / close portion by an output signal indicating occurrence of leakage in the leakage detection circuit, and the leakage An earth leakage circuit breaker comprising: a power supply circuit for supplying power to a detection circuit; a test switch for supplying a test current to a test winding of the zero-phase current transformer; and a test circuit having a current limiting resistance element. An earth leakage circuit breaker comprising means for setting a predetermined operation time regardless of the setting of the operation time setting circuit in conjunction with the operation time setting circuit.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003396858A JP4264817B2 (en) | 2003-11-27 | 2003-11-27 | Earth leakage breaker |
| CN2009101353315A CN101562328B (en) | 2003-11-27 | 2004-11-08 | Residual current circuit breaker |
| CNB2004100907180A CN100505462C (en) | 2003-11-27 | 2004-11-08 | Leakage circuit breaker |
| KR1020040091920A KR100981845B1 (en) | 2003-11-27 | 2004-11-11 | Earth leakage breaker |
| FR0412410A FR2863115B1 (en) | 2003-11-27 | 2004-11-23 | CIRCUIT SWITCH IN CASE OF EARTHFALL DEFECT. |
| DE102004056976A DE102004056976A1 (en) | 2003-11-27 | 2004-11-25 | Residual-current device |
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|---|---|---|---|
| JP2003396858A JP4264817B2 (en) | 2003-11-27 | 2003-11-27 | Earth leakage breaker |
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| JP2005158559A true JP2005158559A (en) | 2005-06-16 |
| JP4264817B2 JP4264817B2 (en) | 2009-05-20 |
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| JP2003396858A Expired - Fee Related JP4264817B2 (en) | 2003-11-27 | 2003-11-27 | Earth leakage breaker |
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|---|---|
| JP (1) | JP4264817B2 (en) |
| KR (1) | KR100981845B1 (en) |
| CN (2) | CN100505462C (en) |
| DE (1) | DE102004056976A1 (en) |
| FR (1) | FR2863115B1 (en) |
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| JP2007149603A (en) * | 2005-11-30 | 2007-06-14 | Mitsubishi Electric Corp | Earth leakage breaker |
| JP2007220381A (en) * | 2006-02-15 | 2007-08-30 | Fuji Electric Fa Components & Systems Co Ltd | Ground fault interrupter |
| JP2007220382A (en) * | 2006-02-15 | 2007-08-30 | Fuji Electric Holdings Co Ltd | Ground fault interrupter |
| JP2009089574A (en) * | 2007-10-03 | 2009-04-23 | Mitsubishi Electric Corp | Ground-fault circuit interrupter |
| KR100902683B1 (en) * | 2007-06-08 | 2009-06-15 | 주식회사 대륙 | Circuit breaker |
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|---|---|---|---|---|
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| DE102011083792A1 (en) * | 2011-09-29 | 2013-04-04 | Bender Gmbh & Co. Kg | Insulation fault locating device and device for isolation fault location in an ungrounded power supply network |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4851950A (en) * | 1987-06-09 | 1989-07-25 | Bassani Ticino, S.P.A. | Electrical apparatus for magnetothermal and differential protection |
| JP2818063B2 (en) * | 1992-01-08 | 1998-10-30 | 三菱電機株式会社 | Earth leakage breaker |
| CN1040473C (en) * | 1992-06-12 | 1998-10-28 | 大延电子株式会社 | Integrated electric leakage warning system |
| CA2093061C (en) * | 1992-07-22 | 2005-02-15 | Raymond H. Legatti | Leakage current protection device adapted to a wide variety of domestic and international applications |
| CN2145469Y (en) * | 1992-10-28 | 1993-11-03 | 尤大千 | Delay electromagnet leakage switch |
| JP3157386B2 (en) * | 1994-06-24 | 2001-04-16 | 三菱電機株式会社 | Ground fault detector |
| JP3230639B2 (en) * | 1994-11-16 | 2001-11-19 | 三菱電機株式会社 | Ground fault detector |
| JP3788042B2 (en) * | 1998-06-30 | 2006-06-21 | マツダ株式会社 | Vehicle occupant protection device |
| JP2002078187A (en) * | 2000-08-28 | 2002-03-15 | Matsushita Electric Works Ltd | Leakage breaker |
-
2003
- 2003-11-27 JP JP2003396858A patent/JP4264817B2/en not_active Expired - Fee Related
-
2004
- 2004-11-08 CN CNB2004100907180A patent/CN100505462C/en not_active Expired - Fee Related
- 2004-11-08 CN CN2009101353315A patent/CN101562328B/en not_active Expired - Fee Related
- 2004-11-11 KR KR1020040091920A patent/KR100981845B1/en not_active IP Right Cessation
- 2004-11-23 FR FR0412410A patent/FR2863115B1/en not_active Expired - Fee Related
- 2004-11-25 DE DE102004056976A patent/DE102004056976A1/en not_active Ceased
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| JP2007149603A (en) * | 2005-11-30 | 2007-06-14 | Mitsubishi Electric Corp | Earth leakage breaker |
| JP4715537B2 (en) * | 2006-02-15 | 2011-07-06 | 富士電機株式会社 | Earth leakage breaker |
| JP2007220381A (en) * | 2006-02-15 | 2007-08-30 | Fuji Electric Fa Components & Systems Co Ltd | Ground fault interrupter |
| JP2007220382A (en) * | 2006-02-15 | 2007-08-30 | Fuji Electric Holdings Co Ltd | Ground fault interrupter |
| KR100902683B1 (en) * | 2007-06-08 | 2009-06-15 | 주식회사 대륙 | Circuit breaker |
| KR200445304Y1 (en) | 2007-07-18 | 2009-07-17 | 주식회사 두원 | Leakage breaker |
| JP2009089574A (en) * | 2007-10-03 | 2009-04-23 | Mitsubishi Electric Corp | Ground-fault circuit interrupter |
| US8941957B2 (en) | 2010-07-30 | 2015-01-27 | Panasonic Intellectual Property Management Co., Ltd. | Battery charger for an electrically-driven vehicle and method of confirming earth leakage applicable thereto |
| CN102931034A (en) * | 2012-07-27 | 2013-02-13 | 苏州贝腾特电子科技有限公司 | Leakage circuit breaker |
| CN106158540A (en) * | 2012-07-27 | 2016-11-23 | 赵牧青 | A kind of RCCB with electric switch-on function |
| CN105895464A (en) * | 2012-07-27 | 2016-08-24 | 赵牧青 | Residual current circuit breaker having automatic closing function |
| CN103151756A (en) * | 2013-03-29 | 2013-06-12 | 苏州长量电器有限公司 | Controller for residual leakage protection circuit breaker |
| KR101611020B1 (en) * | 2013-08-01 | 2016-04-08 | 미쓰비시덴키 가부시키가이샤 | Earth leakage circuit breaker |
| JP2016046063A (en) * | 2014-08-22 | 2016-04-04 | 三菱電機株式会社 | Earth leakage breaker |
| US10483751B2 (en) | 2016-04-28 | 2019-11-19 | Lsis Co., Ltd. | Trip control circuit for circuit breaker |
| JP2018133254A (en) * | 2017-02-16 | 2018-08-23 | 河村電器産業株式会社 | Earth leakage circuit breaker |
| CN107769159A (en) * | 2017-10-25 | 2018-03-06 | 浙江致威电子科技有限公司 | A kind of earth leakage protective device, electrical leakage detecting method and a kind of charging equipment |
| CN112840518A (en) * | 2018-11-19 | 2021-05-25 | Ls电气株式会社 | Residual current circuit breaker and control method thereof |
| CN112840518B (en) * | 2018-11-19 | 2023-04-11 | Ls电气株式会社 | Residual current circuit breaker and control method thereof |
| JP2022059189A (en) * | 2020-10-01 | 2022-04-13 | 富士電機株式会社 | Power conversion device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100505462C (en) | 2009-06-24 |
| DE102004056976A1 (en) | 2005-06-30 |
| FR2863115B1 (en) | 2011-02-11 |
| KR20050051548A (en) | 2005-06-01 |
| FR2863115A1 (en) | 2005-06-03 |
| CN101562328B (en) | 2011-01-05 |
| CN101562328A (en) | 2009-10-21 |
| CN1622414A (en) | 2005-06-01 |
| JP4264817B2 (en) | 2009-05-20 |
| KR100981845B1 (en) | 2010-09-13 |
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