JP2710622B2 - Earth leakage breaker - Google Patents
Earth leakage breakerInfo
- Publication number
- JP2710622B2 JP2710622B2 JP63069143A JP6914388A JP2710622B2 JP 2710622 B2 JP2710622 B2 JP 2710622B2 JP 63069143 A JP63069143 A JP 63069143A JP 6914388 A JP6914388 A JP 6914388A JP 2710622 B2 JP2710622 B2 JP 2710622B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- zero
- earth leakage
- secondary coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Breakers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、第３図に示すように、高感度・高速型漏電
ブレーカ１の電源側電路と大地間に発生する雷サージ等
の衝撃電圧により、漏電ブレーカ１負荷２側電路３と大
地間に負荷機器保護のために接続されたサージアブソー
バ４を介して衝撃電流が大地に流れることによる漏電ブ
レーカ１の誤動作防止に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) As shown in FIG. 3, the present invention relates to an impact voltage such as a lightning surge generated between a power supply side electric circuit of a high-sensitivity / high-speed earth leakage breaker 1 and the ground. Accordingly, the present invention relates to the prevention of the malfunction of the earth leakage breaker 1 due to the shock current flowing to the earth via the surge absorber 4 connected between the earth circuit 3 of the earth leakage breaker 1 and the load 2 for protecting the load equipment.
（従来の技術） 従来、漏電ブレーカ１は第４図、第５図に示すよう
に、負荷２側電路３を１次コイルとする零相変流器５の
２次コイル６出力は増幅器７に入力され、２次コイル６
出力が漏電検出レベルVsを越えたときに増幅器７から漏
電発生信号SAを出力させ、該漏電発生信号SAが一定時間
以上継続した場合に出力を発生するRC積分回路等からな
る時延回路８から遮断信号SBを発生させるとともに、遮
断装置９の接点10をオフ作動させて負荷回路３を遮断し
ている。(Prior Art) Conventionally, as shown in FIG. 4 and FIG. 5, an earth leakage breaker 1 outputs a secondary coil 6 output of a zero-phase current transformer 5 having a load 2 side electric circuit 3 as a primary coil to an amplifier 7. Input, secondary coil 6
When the output exceeds the leakage detection level Vs, the amplifier 7 outputs the leakage generation signal SA, and when the leakage generation signal SA continues for a predetermined time or more, the time delay circuit 8 including an RC integration circuit or the like generates an output. In addition to generating the cutoff signal SB, the load circuit 3 is cut off by turning off the contact 10 of the cutoff device 9.
（発明が解決しようとする課題） この場合において、第６図Ａに示すように、衝撃電流
地絡が発生すると、零相変流器５の２次コイル６から第
６図Ｂに示すように、衝撃電流による直接出力と衝撃電
流がオフになったときの逆起電圧による出力とからなる
波形の出力電圧VZが発生し、該出力電圧VZは増幅器７の
漏電検出レベルVsを大幅に越えた状態で出力時間も時延
回路８、この場合、RC積分回路とコンパレータ11からな
る時延回路８に設定された時延時間より長く（第６図
Ｃ、第６図Ｄ参照）、従って、時延回路８から遮断信号
SBが発生して、漏電ブレーカ１が不要動作すると言う欠
点があった。(Problems to be Solved by the Invention) In this case, as shown in FIG. 6A, when an impact current ground fault occurs, as shown in FIG. 6B, the secondary coil 6 of the zero-phase current transformer 5 An output voltage VZ having a waveform consisting of a direct output by the shock current and an output by the back electromotive force when the shock current is turned off is generated, and the output voltage VZ greatly exceeds the leakage detection level Vs of the amplifier 7. In this state, the output time is longer than the time delay set in the time delay circuit 8, in this case, the time delay circuit 8 including the RC integration circuit and the comparator 11 (see FIGS. 6C and 6D). Shutdown signal from extension circuit 8
There is a drawback that the SB occurs and the earth leakage breaker 1 operates unnecessarily.
なお、衝撃電流が第６図Ａと逆方向に流れた場合に
は、衝撃電流による直接出力と衝撃電流がオフになった
ときの逆起電圧による出力とからなる波形も第６図Ｅの
ように第６図Ｂに示す波形の逆になり、増幅器７の検出
レベルVsを越えた部分の出力時間は第６図Ｅに示すよう
に、時延回路８に設定された時延時間より相当短く、従
って第６図Ｆに示すように、コンデンサＣ端子電圧が低
く、漏電ブレーカ１は誤動作しない。When the shock current flows in the direction opposite to that of FIG. 6A, the waveform composed of the direct output by the shock current and the output by the back electromotive voltage when the shock current is turned off is also as shown in FIG. 6E. 6B, the output time of the portion exceeding the detection level Vs of the amplifier 7 is considerably shorter than the time delay time set in the time delay circuit 8 as shown in FIG. 6E. Therefore, as shown in FIG. 6F, the voltage at the capacitor C terminal is low, and the earth leakage breaker 1 does not malfunction.
そこで本発明は、負荷回路の電路とアース間にサージ
アブソーバを接続した状態においても、衝撃電流発生時
に誤動作することのない高感度・高速型漏電ブレーカを
提供することを目的とする。Accordingly, an object of the present invention is to provide a high-sensitivity, high-speed earth leakage breaker that does not malfunction when an impact current is generated even when a surge absorber is connected between the electric circuit of the load circuit and the ground.
（課題を解決するための手段） 本発明は、負荷側電路の零相電流を検出する零相変流
器の２次コイルの電圧が漏電検出レベルを超えたときに
漏電発生信号を出力する増幅器と、前記漏電発生信号の
出力時間が所定の時間を超えたときに前記負荷側電路に
対する電源の供給を遮断させる遮断信号を出力する時延
回路とを備えた漏電ブレーカにおいて、前記零相変流器
の２次コイルの両端間に、ダイオードとコンデンサの直
列回路を接続するとともに前記ダイオードに並列に抵抗
を接続することである。(Means for Solving the Problems) The present invention provides an amplifier for outputting a leakage occurrence signal when a voltage of a secondary coil of a zero-phase current transformer for detecting a zero-phase current in a load side electric circuit exceeds a leakage detection level. And a time delay circuit that outputs a shutoff signal for shutting off the supply of power to the load side electric circuit when the output time of the earth leakage occurrence signal exceeds a predetermined time. Connecting a series circuit of a diode and a capacitor between both ends of the secondary coil of the vessel and connecting a resistor in parallel with the diode.
（作用） このように構成された漏電ブレーカにおいて、衝撃電
流地絡が発生した場合、零相変流器の２次コイルからの
サージ電流による直接出力によって、該２次コイルに接
続されたコンデンサがダイオードを通して充電されると
ともに、サージ電流がオフになると、該コンデンサに充
電された充電電荷がダイオードと並列に接続された抵抗
を通して零相変流器における２次コイルと並列に接続さ
れた抵抗、ダイオード等の外部回路に放電され、この放
電電流はサージ電流がオフになったときの逆起電圧によ
る出力を打消す結果、増幅器の検出レベルVsを大幅に越
えた部分の出力時間は時延回路に設定された時延時間よ
り短く、時延回路から出力は発生されず、漏電ブレーカ
は誤動作しない。(Operation) In the earth leakage breaker configured as described above, when an impact current ground fault occurs, the capacitor connected to the secondary coil of the zero-phase current transformer is directly output by a surge current from the secondary coil. When charging is performed through the diode and the surge current is turned off, the charge stored in the capacitor is connected to the resistor connected in parallel with the secondary coil in the zero-phase current transformer through the resistor connected in parallel with the diode. This discharge current cancels the output due to the back electromotive force when the surge current is turned off.As a result, the output time of the portion that greatly exceeds the detection level Vs of the amplifier is output to the time delay circuit. The time delay time is shorter than the set time delay time, no output is generated from the time delay circuit, and the earth leakage breaker does not malfunction.
（発明の効果） その結果、本発明は高感度・高速型漏電ブレーカであ
っても、衝撃電流地絡によって誤動作することのない漏
電ブレーカを簡単 な回路でしかも容易に得ることができる効果がある。(Effects of the Invention) As a result, the present invention has an effect that even with a high-sensitivity, high-speed earth leakage breaker, an earth leakage breaker that does not malfunction due to a shock current ground fault can be easily obtained with a simple circuit. .
（実施例） 次に、本発明の一実施例の構成を第１図、第２図によ
って説明する。Embodiment Next, the configuration of an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.
なお、従来回路と同一部分については同一符号を用い
る。The same parts as those of the conventional circuit are denoted by the same reference numerals.
負荷電路３を１次コイルとする零相変流器５の２次コ
イル６出力端子は、該２次コイル６の出力電圧が漏電検
出レベルVsを越えたときに漏電発生信号SAを出力させる
増幅器７に接続され、零相変流器５の２次コイル６出力
端子間には感度設定用抵抗R1が接続され、増幅器７の入
力端子間には、過大入力による増幅器７の破壊を防止す
るためのダイオードD1,D2がそれぞれ逆方向に２個接続
されている他、漏電ブレーカ１の電源側で発生した雷サ
ージ等の衝撃電圧によりサージアブソーバ４を介してア
ースに流れる衝撃電流によって発生する零相変流器５の
２次コイル６出力を吸収するためのコンデンサC1とダイ
オードD3との直列回路が接続され、かつ、このダイオー
ドD3と並列にコンデンサC1の充電電荷を抵抗R1等の外部
回路に放電させるための放電抵抗R2が接続され、更に、
零相変流器５の２次コイル６と増幅器７間には電流制限
用抵抗R3と前記コンデンサC1に十分な充電電圧を与える
ための抵抗R4とが接続されている。The output terminal of the secondary coil 6 of the zero-phase current transformer 5 having the load circuit 3 as a primary coil is an amplifier for outputting a leakage generation signal SA when the output voltage of the secondary coil 6 exceeds the leakage detection level Vs. 7, a sensitivity setting resistor R1 is connected between the output terminals of the secondary coil 6 of the zero-phase current transformer 5 and between the input terminals of the amplifier 7 to prevent the destruction of the amplifier 7 due to excessive input. In addition to the two diodes D1 and D2 connected in the opposite directions, a zero-phase current generated by a shock current flowing to the ground via the surge absorber 4 due to a shock voltage such as a lightning surge generated on the power supply side of the earth leakage breaker 1 A series circuit of a capacitor C1 and a diode D3 for absorbing the output of the secondary coil 6 of the current transformer 5 is connected, and the charge of the capacitor C1 is discharged in parallel with the diode D3 to an external circuit such as a resistor R1. Discharge to make Anti R2 are connected, furthermore,
Between the secondary coil 6 of the zero-phase current transformer 5 and the amplifier 7, a current limiting resistor R3 and a resistor R4 for providing a sufficient charging voltage to the capacitor C1 are connected.
又、増幅器７には該増幅器７からの漏電発生信号SA出
力時間が時延時間を越えたときに漏電検出信号SBを発生
させる時延回路８、この場合、RC積分回路とコンパレー
タ11からなる時延回路８が接続され、該時延回路８には
該時延回路８から漏電遮断信号SBが発生したときに接点
10をオフ作動させて負荷電路３を遮断する公知の遮断装
置９が接続されている。The amplifier 7 has a time delay circuit 8 for generating a leak detection signal SB when the output time of the leak occurrence signal SA from the amplifier 7 exceeds the time delay time. An extension circuit 8 is connected, and the time extension circuit 8 has a contact when the leakage interruption signal SB is generated from the time extension circuit 8.
A known shut-off device 9 for turning off the load electric circuit 3 by turning off the power supply 10 is connected.
次に、本実施例の作用について説明する。 Next, the operation of the present embodiment will be described.
このように構成された漏電ブレーカ１において、衝撃
電流地絡が発生すると（第２図Ａ参照）、零相変流器５
の２次コイル６からの衝撃電流（第２図Ｂ参照）による
直接出力によって、該２次コイル６に接続されたコンデ
ンサC1がダイオードD3を通して充電されるとともに、衝
撃電流がオフになると、該コンデンサC1に充電された充
電電荷がダイオードD3と並列に接続された放電抵抗R2を
通して抵抗R1に放電されて、コンデンサC1両端間に第２
図Ｃに示す電圧波形を発生させる一方、この第２図Ｃに
対応した放電電流によって、衝撃電流がオフになったと
きの逆起電圧による第２図Ｂに示す波形の出力電圧VZは
打消され、増幅器７には第２図Ｄに示す電圧波形が入力
されることになり、その結果、増幅器７の漏電検出レベ
ルVsを大幅に越えた部分の出力時間は時延回路８に設定
された時延時間より短く、時延回路８から出力は発生さ
れず（第２図Ｅ参照）、漏電ブレーカ１は誤動作しな
い。In the earth leakage breaker 1 configured as described above, when an impact current ground fault occurs (see FIG. 2A), the zero-phase current transformer 5
The capacitor C1 connected to the secondary coil 6 is charged through the diode D3 by the direct output due to the impact current (see FIG. 2B) from the secondary coil 6, and when the impact current is turned off, the capacitor C1 is turned off. The charge stored in C1 is discharged to the resistor R1 through the discharge resistor R2 connected in parallel with the diode D3.
While the voltage waveform shown in FIG. C is generated, the output voltage VZ having the waveform shown in FIG. 2B due to the back electromotive voltage when the impact current is turned off is canceled by the discharge current corresponding to FIG. 2C. The voltage waveform shown in FIG. 2D is input to the amplifier 7, and as a result, the output time of the portion of the amplifier 7 which greatly exceeds the leakage detection level Vs is set when the time delay circuit 8 is set. The time is shorter than the extension time, no output is generated from the time extension circuit 8 (see FIG. 2E), and the earth leakage breaker 1 does not malfunction.
即ち、高感度・高速型漏電ブレーカ１によって負荷２
がオン・オフ制御される負荷電路３の電路・大地間にサ
ージアブソーバ４を接続したことにより、衝撃電流地絡
が発生しても、漏電ブレーカ１が誤動作することはな
い。That is, the high sensitivity and high speed type earth leakage breaker 1
Since the surge absorber 4 is connected between the electric circuit and the ground of the load electric circuit 3 whose on / off control is performed, the earth leakage breaker 1 does not malfunction even if an impact current ground fault occurs.
第１図は本発明の一実施例の電気回路図、第２図はその
動作特性を示す波形図、第３図は本発明と従来実施例に
共通するサージアブソーバ接続状態を示す電気回路図、
第４図は従来実施例の電気回路図、第５図と第６図は従
来実施例の動作特性を示す波形図である。 １……漏電ブレーカ、３……負荷電路 ５……零相変流器、７……増幅器 ８……時延回路、D3……ダイオード Ｃ……コンデンサ、R2……抵抗FIG. 1 is an electric circuit diagram of one embodiment of the present invention, FIG. 2 is a waveform diagram showing its operation characteristics, FIG. 3 is an electric circuit diagram showing a surge absorber connection state common to the present invention and the conventional embodiment,
FIG. 4 is an electric circuit diagram of a conventional embodiment, and FIGS. 5 and 6 are waveform diagrams showing operating characteristics of the conventional embodiment. 1 leakage breaker 3 load circuit 5 zero-phase current transformer 7 amplifier 8 delay circuit D3 diode C capacitor R2 resistor
Claims (1)
器の２次コイルの電圧が漏電検出レベルを超えたときに
漏電発生信号を出力する増幅器と、前記漏電発生信号の
出力時間が所定の時間を超えたときに前記負荷側電路に
対する電源の供給を遮断させる遮断信号を出力する時延
回路とを備えた漏電ブレーカにおいて、前記零相変流器
の２次コイルの両端間にダイオードとコンデンサの直列
回路を接続するとともに前記ダイオードに並列に抵抗を
接続したことを特徴とする漏電ブレーカ。1. An amplifier for outputting a leakage occurrence signal when a voltage of a secondary coil of a zero-phase current transformer for detecting a zero-phase current in a load side electric circuit exceeds a leakage detection level, and an output of the leakage occurrence signal. A time delay circuit that outputs a cutoff signal for cutting off the supply of power to the load-side electric circuit when the time exceeds a predetermined time, between the two ends of the secondary coil of the zero-phase current transformer. And a series circuit of a diode and a capacitor, and a resistor connected in parallel to the diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63069143A JP2710622B2 (en) | 1988-03-23 | 1988-03-23 | Earth leakage breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63069143A JP2710622B2 (en) | 1988-03-23 | 1988-03-23 | Earth leakage breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01243816A JPH01243816A (en) | 1989-09-28 |
| JP2710622B2 true JP2710622B2 (en) | 1998-02-10 |
Family
ID=13394134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63069143A Expired - Lifetime JP2710622B2 (en) | 1988-03-23 | 1988-03-23 | Earth leakage breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2710622B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03256517A (en) * | 1990-03-06 | 1991-11-15 | Tempearl Ind Co Ltd | Leakage circuit breaker |
| JP3232054B2 (en) * | 1998-11-02 | 2001-11-26 | 鈴野化成株式会社 | Cosmetic material container and cartridge for cosmetic material container |
| FR3083926B1 (en) * | 2018-07-12 | 2021-08-06 | Hager Electro Sas | DIFFERENTIAL PROTECTION DEVICE |
| US10884070B2 (en) * | 2019-01-30 | 2021-01-05 | Koninklijke Fabriek Inventum B.V. | System and method for ground fault detection using current measurement coils |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59185934U (en) * | 1983-05-30 | 1984-12-10 | 松下電工株式会社 | Electric leakage or disconnection |
-
1988
- 1988-03-23 JP JP63069143A patent/JP2710622B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01243816A (en) | 1989-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS58205333A (en) | Protecting circuit for switching transistor | |
| US3895263A (en) | Grounded neutral detector drive circuit for two pole ground fault interrupter | |
| US4013925A (en) | Overload protection circuit for voltage regulator | |
| JP2710622B2 (en) | Earth leakage breaker | |
| JP4066821B2 (en) | Earth leakage detection circuit for earth leakage breaker | |
| JP2000102158A (en) | Earth leakage circuit breaker | |
| EP0464516B1 (en) | Earth leakage-current protection system | |
| JPS644376B2 (en) | ||
| JP3112310B2 (en) | Earth leakage protection system and earth leakage breaker | |
| JP2874780B2 (en) | Current detector | |
| US3976918A (en) | False triggering protection for ground fault sensor | |
| JP3251803B2 (en) | Overcurrent protection circuit and overvoltage protection circuit | |
| CA1036670A (en) | Ground fault detector circuit with high current inhibit | |
| JP2755391B2 (en) | Overcurrent protection circuit | |
| JP2542411Y2 (en) | Current detector | |
| JPH03256517A (en) | Leakage circuit breaker | |
| JP2018133254A (en) | Earth leakage circuit breaker | |
| KR0154824B1 (en) | Current limit protection circuit | |
| SU1529346A1 (en) | Device for overload protection of high-voltage power sources | |
| JPH0758298B2 (en) | Current detector | |
| US3579043A (en) | Reverse power relay | |
| JP2515948Y2 (en) | Current detector | |
| JPH07336872A (en) | Pulse generator | |
| JP2000261953A (en) | Leakage breaker | |
| KR0129938Y1 (en) | Short circuit breaker having the function of preventing short circuit by element deterioration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081024 Year of fee payment: 11 |