WO2017199328A1 - 漏電遮断器 - Google Patents
漏電遮断器 Download PDFInfo
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- WO2017199328A1 WO2017199328A1 PCT/JP2016/064578 JP2016064578W WO2017199328A1 WO 2017199328 A1 WO2017199328 A1 WO 2017199328A1 JP 2016064578 W JP2016064578 W JP 2016064578W WO 2017199328 A1 WO2017199328 A1 WO 2017199328A1
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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
- H02H3/34—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 of a three-phase system
- H02H3/347—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 of a three-phase system using summation current transformers
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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
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Definitions
- the present invention relates to a leakage breaker capable of outputting a leakage test signal from two ports of a built-in IC or microcontroller and changing the duty ratio and phase of the leakage test signal.
- an earth leakage test function is provided as a means for confirming whether the operation when the earth leakage is detected is sound.
- a leakage breaker having a leakage test function a zero-phase current transformer that detects a leakage current, a detection resistor that converts a secondary-side output current of the zero-phase current transformer into a voltage, and the detection resistor are generated.
- a signal detection circuit that takes in the voltage using A / D conversion; and a leakage test circuit that outputs a leakage test signal to the tertiary winding of the zero-phase current transformer, and the leakage test signal is received from the leakage test circuit.
- the signal detection circuit By applying to the tertiary winding of the zero-phase current transformer, the signal detection circuit detects the secondary-side output current of the zero-phase current transformer according to the leakage test signal, and the electric circuit according to the leakage characteristics There is a ground fault circuit breaker configured to shut off or to output a ground fault alarm alarm.
- Patent Document 1 Japanese Patent Laid-Open No. 9-219923
- Patent Document 2 Japanese Utility Model Laid-Open No. 6-84380
- Patent Document 3 Japanese Patent Laid-Open No. 2014-11909
- the normal leakage current waveform is an AC waveform
- the test signal is a simple rectangular waveform
- the AC waveform cannot be simulated as a simulated waveform. It was insufficient.
- the present invention has been made to solve the problems of the conventional earth leakage circuit breaker as described above, and enables the output of a simulated waveform close to an AC waveform, and also simulates a special waveform such as a thyristor load waveform.
- the purpose is to obtain a possible earth leakage breaker.
- An earth leakage breaker includes a zero-phase current transformer for detecting a leakage current flowing in an AC circuit, a detection resistor for converting a secondary side output current of the zero-phase current transformer into a voltage, and the detection resistor.
- a / D conversion of the generated voltage, and a detection circuit that outputs a trip signal or alarm signal if the detected voltage is above a certain level, and a leakage test that outputs two or more leakage test signals with different phases A circuit, an alarm output circuit that operates in response to the trip signal or alarm output signal, and a trigger circuit that outputs the leakage test signal.
- An earth leakage breaker includes a zero-phase current transformer for detecting a leakage current flowing in an AC circuit, a detection resistor for converting a secondary side output current of the zero-phase current transformer into a voltage, and the detection resistor.
- FIG. 1 is a block diagram showing an earth leakage circuit breaker according to Embodiment 1 of the present invention.
- an earth leakage circuit breaker 100 includes an open / close contact 2 for opening / closing an AC circuit 1 including a first phase AC circuit 1a, a second phase AC circuit 1b, and a third phase AC circuit 1c, which are unit circuits, and an AC circuit. 1 and a zero-phase current transformer 3 that outputs a current signal proportional to the leakage current flowing in the AC circuit 1 and a voltage proportional to the current signal generated from the zero-phase current transformer 3.
- a detection resistor 4 that converts the signal into a signal a voltage signal of the detection resistor 4 is captured as digital data by an A / D conversion circuit 5a having a differential input function, and a leakage current value is detected by a signal detection circuit 5 that detects leakage. If the detection voltage of the signal detection circuit 5 exceeds a certain value, the tripping coil 6a is energized by the output signal of the signal detection circuit 5, and the switching contact 2 is opened when the tripping coil 6a is energized.
- a trigger circuit 7 for outputting a trigger signal 7a for confirming whether or not the leakage breaker 100 operates normally when the leakage current flows in a state where the leakage current does not flow in the AC circuit 1, and the trigger circuit And a leakage test circuit 9 for energizing the tertiary winding 8 of the zero-phase current transformer 3 based on a trigger signal from the zero-phase current transformer 3.
- the earth leakage breaker 100 also has an alarm output circuit 10 that outputs an alarm signal 5b from the signal detection circuit 5 and operates the alarm output circuit, thereby performing contact output and LED display.
- the earth leakage test circuit 9 includes a first port 9a, a second port 9b, and a control unit 9c.
- the first port 9a includes a first FET 9a1 which is a p-type field effect transistor having a drain connected to a power supply, and an n-type field effect having a drain connected to the source of the first FET 9a1 and a source connected to the ground.
- a second FET 9a2 which is a transistor. The gate of the first FET 9a1 and the gate of the second FET 9a2 are connected, and the connection point is connected to the control unit 9c.
- the second port 9b of the leakage test circuit 9 has a third FET 9b1 which is a p-type field effect transistor having a drain connected to a power source, and a drain connected to the source of the third FET 9b1.
- a fourth FET 9b2 which is an n-type field effect transistor which is connected and whose source is connected to the ground.
- the gate of the third FET 9b1 and the gate of the fourth FET 9b2 are connected, and the connection point is connected to the control unit 9c.
- a trigger signal 7a from the trigger circuit 7 is also input to the control unit 9c.
- reference numeral 9c1 indicates a first output of the control unit 9c
- reference numeral 9c2 indicates a second output of the control unit 9c.
- connection point between the source of the first FET 9a1 and the drain of the second FET 9a2 is connected to one end of the tertiary winding 8 of the zero-phase current transformer 9, and the third FET 9b1 Is connected to the other end of the tertiary winding 8.
- the tertiary winding 8 is provided with a resistor 8a for defining the current flowing through the tertiary winding 8.
- the earth leakage breaker according to the first embodiment is configured as described above, and the earth leakage test will be described next.
- a pseudo leakage current is supplied to the test winding 8 in a state where no leakage current flows in the AC circuit 1. This is a test to check whether or not the earth leakage interrupting operation is performed when the leakage current flows.
- the A / D conversion circuit 5a of the signal detection circuit 5 causes the leakage current.
- a simulated waveform is detected.
- the simulated waveform of the leakage current is a waveform that exceeds a predetermined leakage current value.
- the signal detection circuit 5 that has detected the simulated waveform of the leakage current trips the trip signal, outputs it to the coil 6a, operates the trip circuit 6, opens the switching contact 2, and cuts off the AC circuit 1.
- the alarm output circuit 10 is operated by outputting the alarm signal 5b. Thereby, the same operation
- the method of outputting a leakage current simulated waveform from the leakage test circuit 9 in the present embodiment is a configuration in which a pseudo leakage current is directly applied to the tertiary winding 8 of the zero-phase current transformer 3.
- FIG. 3 is a chart showing a first simulated waveform pattern output from the leakage test circuit 9.
- FIG. 4 is a diagram for explaining the details of the leakage test circuit 9.
- FIG. 4 (a) shows that the first port 9a is Hi and the second port 9b is Lo output
- FIG. 4 (b) shows the first port 9a. Lo, when the second port 9b is Hi output.
- a rectangular AC waveform is formed in a simulated manner to the tertiary winding 8.
- a pseudo waveform current is applied. More specifically, as shown in FIG. 4A, the first output 9c1 of the control unit 9c is output as Hi, and the second output 9c2 of the control unit 9c is output as Lo, so that the first port 9a becomes Hi, The second port 9b becomes Lo, and a current flows through the tertiary winding 8 from the first port 9a to the second port 9b.
- the first output 9c1 of the control unit 9c is output as Lo and the second output 9c2 of the control unit 9c is output as Hi, so that the first port 9a is Lo, Port 9b becomes Hi, and a current flows through the tertiary winding 8 from the second port 9b to the first port 9a.
- the secondary winding of the zero-phase current transformer 3 is excited by this current, and an excitation current proportional to the current supplied to the tertiary winding 8 is generated.
- an excitation current proportional to the current supplied to the tertiary winding 8 is generated at both ends of the detection resistor 4 and is taken into the signal detection circuit 5 as digital data by the A / D conversion circuit 5a of the signal detection circuit 5. . Since the pseudo leakage current has a waveform exceeding the specified current value, the signal detection circuit 5 excites the tripping coil 6a to operate the tripping circuit 6, thereby opening the switching contact 2 and opening the AC circuit. A test operation to shut off 1 is performed.
- the A / D conversion circuit 5a of the signal detection circuit 5 has a differential input function.
- an AC waveform can be obtained. It can be a simulated signal.
- FIG. 5 is a chart showing a second simulated waveform pattern output from the leakage test circuit 9 and is an example in which a waveform closer to a sine wave is output. That is, by providing a phase difference ⁇ between the outputs of the first port 9a and the second port 9b, a simulated waveform closer to a sine wave can be output instead of a simple rectangular wave.
- each of the outputs of the first port 9a and the second port 9b may be changed to an arbitrary duty ratio, and by performing waveform control of the outputs of the first port 9a and the second port 9b, As a leakage test signal for the test operation, it is possible to easily output a waveform close to an actual waveform instead of a simple rectangular waveform.
- FIG. 6 is a chart showing a third simulated waveform pattern output from the leakage test circuit 9 and is an example in which a waveform simulating a half-wave rectified ground fault current is output. That is, it is possible by eliminating the output of the second port 9b.
- the type capable of detecting only an AC ground fault is “Type AC”, and the type capable of detecting a half-wave rectified ground fault is “Type A”.
- a simulated waveform of “Type A” can be used as a test signal by setting the output of the second port 9b to Lo.
- the leakage breaker converts the zero-phase current transformer for detecting the leakage current flowing in the AC circuit, and the secondary-side output current of the zero-phase current transformer into a voltage.
- a detection resistor and a signal detection circuit that takes in a voltage generated in the detection resistor by A / D conversion and outputs a trip signal or an alarm signal if the detection voltage is a certain level or more, and two or more leaks having different phases
- An electric leakage test circuit that outputs a test signal, an alarm output circuit that operates in response to the trip signal or alarm output signal, and a trigger circuit that outputs the electric leakage test signal. It is possible to easily output a signal that is not a simple rectangular waveform but close to an actual waveform. For example, even when a waveform with an indefinite phase that flows through a thyristor circuit is input, Confirmation that operates normally by outputting a simulated signal waveform from the strike circuit becomes possible.
- FIG. 7 is a block diagram showing an earth leakage circuit breaker according to the second embodiment.
- the same or corresponding parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
- the leakage breaker 200 according to the second embodiment is configured to apply a voltage signal directly to the A / D conversion circuit 5a of the signal detection circuit 5 as a method of outputting a simulated waveform of the leakage current from the leakage test circuit 9. is there.
- the leakage test circuit 9 is connected to the A / D conversion circuit 5a of the signal detection circuit 5, and the voltage signal of the leakage test circuit 9 is applied to the A / D conversion circuit 5a of the signal detection circuit 5 to simulate the AC waveform. Output.
- the A / D conversion circuit 5a of the signal detection circuit 5 takes the digital data into the signal detection circuit 5 and has a waveform that exceeds the specified leakage current value. Then, a tripping signal is output to excite the tripping coil 6a, and the tripping circuit 6 is operated. Thereby, the test operation
- the earth leakage breaker 200 according to the second embodiment also exhibits the same effect as the earth leakage breaker 100 according to the first embodiment.
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Abstract
Description
この発明の上記以外の目的、特徴、観点及び効果は、図面を参照する以下のこの発明の詳細な説明から、さらに明らかになると考える。
図1は、この発明の実施の形態1による漏電遮断器を示すブロック図である。
図1において、漏電遮断器100は、単位電路である第1相交流電路1a、第2相交流電路1b、第3相交流電路1cからなる交流電路1を夫々開閉する開閉接点2と、交流電路1中に挿入され、交流電路1に流れる漏えい電流に比例した電流信号を出力する零相変流器3と、この零相変流器3から生成された電流信号をこの電流信号に比例した電圧信号に変換する検出抵抗4と、検出抵抗4の電圧信号を差動入力機能を有するA/D変換回路5aによりデジタルデータとして取り込み、漏電を検出する信号検出回路5と、規定の漏えい電流値を上回って、信号検出回路5の検出電圧が一定以上の場合、信号検出回路5の出力信号により付勢される引き外しコイル6aを有し、この引き外しコイル6aの付勢時に開閉接点2を開離駆動する引き外し回路6と、交流電路1に漏えい電流が流れていない状態で漏えい電流が流れた時に漏電遮断器100が正常動作するか確認するためのトリガ信号7aを出力するトリガ回路7と、このトリガ回路7からのトリガ信号に基づき零相変流器3の3次巻線8に電流を通電する漏電テスト回路9と、を有している。
第1のポート9aは、電源にドレインが接続されたp型電界効果トランジスタである第1のFET9a1と、ドレインが第1のFET9a1のソースに接続され、ソースがグランドに接続されたn型電界効果トランジスタである第2のFET9a2と、から構成されている。また、第1のFET9a1のゲートと第2のFET9a2のゲートは接続されており、その接続点は制御部9cに接続されている。
漏電テストは、漏洩電流が発生した際に、漏電遮断器100が正しく動作するかどうかを確認する機能として、交流電路1に漏えい電流が流れていない状態で、疑似漏洩電流をテスト巻線8に流し、漏えい電流が流れた時に漏電遮断動作が行われるか確認するテストである。
トリガ回路7からトリガ信号7aを漏電テスト回路9の制御部9cへ入力し、漏電テスト回路9から漏えい電流の模擬波形を出力させることで、信号検出回路5のA/D変換回路5aは漏えい電流の模擬波形を検出する。漏えい電流の模擬波形はあらかじめ規定された漏えい電流値を上回った波形とする。漏えい電流の模擬波形を検出した信号検出回路5は引きはずし信号を引き外しコイル6aに出力して引きはずし回路6を動作させ、開閉接点2を開路して交流電路1を遮断する。併せて、警報信号5bを出力させて警報出力回路10を動作させる。これにより、交流電路1に漏えい電流が発生したときと同じ動作を確認することができる。
図3は漏電テスト回路9から出力される第1の模擬波形パターンを示すチャート図である。また、図4は漏電テスト回路9の詳細を説明する図で、(a)は第1のポート9aがHi、第2のポート9bがLo出力の時、(b)は第1のポート9aがLo、第2のポート9bがHi出力の時を示している。
より詳細には、図4(a)に示すように、制御部9cの第1出力9c1をHi出力、制御部9cの第2出力9c2をLo出力することで、第1のポート9aがHi、第2のポート9bがLoとなり、3次巻線8には第1のポート9aから第2のポート9bへと電流が流れる。
次に、この発明の実施の形態2による漏電遮断器について説明する。図7は、実施の形態2による漏電遮断器を示すブロック図で、実施の形態1と同一、若しくは相当する部分には同一符号を付して詳細説明を省略する。
実施の形態2による漏電遮断器200は、漏電テスト回路9から漏えい電流の模擬波形を出力する方法として、信号検出回路5のA/D変換回路5aへ直接電圧信号を印加する構成としたものである。
Claims (5)
- 交流電路に流れる漏えい電流を検出するための零相変流器と、
前記零相変流器の2次側出力電流を電圧に変換する検出抵抗と、
前記検出抵抗に発生した電圧をA/D変換して取り込み、検出電圧が一定以上であれば引きはずし信号あるいは警報信号を出力する信号検出回路と、
2つ以上の位相の異なる漏電テスト信号を出力する漏電テスト回路と、
前記引きはずし信号あるいは警報出力信号を受けて動作する警報出力回路と、
前記漏電テスト信号を出力するトリガ回路を備えたことを特徴とする漏電遮断器。 - 前記信号検出回路は、差動入力機能を持つA/D変換回路を内蔵すると共に、前記漏電テスト回路から出力される2つ以上の位相の異なる漏電テスト信号は、前記A/D変換回路へ直接もしくは間接的に入力されていることを特徴とする請求項1記載の漏電遮断器。
- 前記漏電テスト回路は、前記零相変流器の3次巻線へ接続されるか、前記A/D変換回路へ接続されており、前記交流電路に漏えい電流が発生してなくても、漏えい電流が発生したときに生じる動作が可能であることを特徴とする請求項2に記載の漏電遮断器。
- 前記漏電テスト回路は、前記3次巻線の一端に接続された第1のポートと、前記3次巻線の他端に接続された第2のポートと、を有することを特徴とする請求項3に記載の漏電遮断器。
- 前記漏電テスト回路から出力される信号は、位相制御もしくは任意に波形制御することができ、それにより発生させるテスト信号も動作確認したい波形に合わせて任意に設定できることを特徴とする請求項1から4の何れか一項に記載の漏電遮断器。
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CN201680085647.6A CN109196746B (zh) | 2016-05-17 | 2016-05-17 | 漏电断路器 |
PCT/JP2016/064578 WO2017199328A1 (ja) | 2016-05-17 | 2016-05-17 | 漏電遮断器 |
JP2018517962A JP6591056B2 (ja) | 2016-05-17 | 2016-05-17 | 漏電遮断器 |
EP16902348.8A EP3460934B1 (en) | 2016-05-17 | 2016-05-17 | Earth leakage circuit breaker |
KR1020187025329A KR102095406B1 (ko) | 2016-05-17 | 2016-05-17 | 누전 차단기 |
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CN206740902U (zh) * | 2017-05-18 | 2017-12-12 | 上海路美思电气有限公司 | 智能装置 |
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- 2016-05-17 KR KR1020187025329A patent/KR102095406B1/ko active IP Right Grant
- 2016-05-17 JP JP2018517962A patent/JP6591056B2/ja active Active
- 2016-05-17 EP EP16902348.8A patent/EP3460934B1/en active Active
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JP6591056B2 (ja) | 2019-10-16 |
CN109196746A (zh) | 2019-01-11 |
EP3460934B1 (en) | 2021-12-22 |
EP3460934A4 (en) | 2019-05-22 |
KR20180108776A (ko) | 2018-10-04 |
EP3460934A1 (en) | 2019-03-27 |
JPWO2017199328A1 (ja) | 2018-09-27 |
KR102095406B1 (ko) | 2020-03-31 |
CN109196746B (zh) | 2020-07-07 |
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