CN101488657A - Detection and protection apparatus for leakage - Google Patents
Detection and protection apparatus for leakage Download PDFInfo
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- CN101488657A CN101488657A CNA2009101056022A CN200910105602A CN101488657A CN 101488657 A CN101488657 A CN 101488657A CN A2009101056022 A CNA2009101056022 A CN A2009101056022A CN 200910105602 A CN200910105602 A CN 200910105602A CN 101488657 A CN101488657 A CN 101488657A
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Abstract
The invention discloses an electric leakage detection protective device, comprising a commercial power on-off relay, a voltage detecting circuit and an electric leakage protection control circuit which are connected with the commercial power on-off relay, a single chip circuit connected between the electric leakage protection control circuit and the voltage detecting circuit, and an analog electric leakage circuit connected with the single chip circuit; wherein, the commercial power on-off relay and the electric leakage protection control circuit are connected with a zero sequence current transformator; in addition, the zero sequence current transformator is further connected with a feed circuit. The electric leakage detection protective device in the invention can self-detect whether the protection circuit is invalid once at regular intervals; if so, an alarm is given; whether the protection circuit is valid is self-detected so as to ensure electric leakage protection to keep normal operation and eliminate potential safety hazard.
Description
[technical field]
The present invention relates to the electric leakage protection technology field, particularly a kind of detection and protection apparatus for leakage.
[background technology]
Electrical equipment can not guarantee leakproof under long-term situation about using, electric leakage is a kind of big potential safety hazard, directly threatens personal safety, and particularly as this electric appliances such as water heater, electric blankets, existing at present many families have used earth leakage protective device.Chinese patent discloses a kind of self-action earth leakage protective device No. 02235589.8, and it comprises trigger, controllable silicon, zero sequence current mutual inductor, release, circuit breaker and pressure limiting resistance.The primary coil of zero sequence current mutual inductor is socketed in outside single-phase or the three phase mains lead, during electric leakage, one part of current flows into the neutral ground point by pressure limiting resistance, make the interior current phasor of primary coil and non-vanishing, the induced voltage of secondary coil triggers the controllable silicon conducting, make release act on circuit breaker, and cut off the electricity supply automatically, avoid the dangerous voltage that continues and the electric shock phenomenon of human body by electromagnetic force.Whether its principle is to use zero sequence current mutual inductor to detect to leak electricity, if electric leakage then disconnect civil power.Yet these earth leakage protective devices do not consider all whether the protective effect of its device itself lost efficacy, whether its reliability is stablized etc.So be necessary to research and develop a kind of scheme, can monitor earth leakage protective device, regularly detect earth leakage protective device voluntarily and whether lost efficacy, if lost efficacy, then point out.
[summary of the invention]
Whether for addressing the above problem, main purpose of the present invention is to provide a kind of detection and protection apparatus for leakage, and it can be regularly carry out the oneself to protective circuit and detects, detect protective circuit and lost efficacy, if lost efficacy then send warning.
For achieving the above object, technical scheme of the present invention is:
A kind of detection and protection apparatus for leakage, is connected in single chip circuit between earth leakage protective control circuit and the voltage detecting circuit and the simulation leakage circuit that is connected with single chip circuit at the voltage detecting circuit that comprise civil power break-make relay, is connected with civil power break-make relay and earth leakage protective control circuit; Wherein, civil power break-make relay is connected zero sequence current mutual inductor with the earth leakage protective control circuit; In addition, zero sequence current mutual inductor also is connected with power supply circuits.
Compared to prior art; whether whether detection and protection apparatus for leakage of the present invention can carry out the oneself at regular intervals and detect a protective circuit and lost efficacy, if lost efficacy then report to the police, effective by the self check protective circuit; guarantee that earth leakage protective keeps operate as normal, eliminates safe hidden trouble.
[description of drawings]
Fig. 1 is a theory diagram of the present invention.
Fig. 2 shows for zero sequence current mutual inductor circuit connection diagram of the present invention.
Fig. 3 is circuit theory diagrams of the present invention.
Fig. 4 is civil power break-make detection waveform figure.
Fig. 5 is self check process flow diagram of the present invention.
[embodiment]
See also shown in Figure 1ly, the voltage detecting circuit that a kind of detection and protection apparatus for leakage of the present invention comprises civil power break-make relay, be connected with civil power break-make relay and earth leakage protective control circuit, be connected in single chip circuit between earth leakage protective control circuit and the voltage detecting circuit and the simulation leakage circuit that is connected with single chip circuit.Wherein, civil power break-make relay is connected zero sequence current mutual inductor with the earth leakage protective control circuit; In addition, zero sequence current mutual inductor also is connected with power supply circuits.Civil power break-make relay is closed under the normal condition, and civil power has output through behind this device, and supplies with each electrical equipment.When the self check time then; in the moment of voltage detecting circuit output level by high step-down; single chip circuit sends a high level pulse signal to the simulation leakage circuit; simulate of short duration electric leakage; the zero sequence current mutual inductor magnetic test coil can be exported an electric leakage signal under the normal condition at this moment; through civil power break-make relay is disconnected; single chip circuit detects less than civil power by voltage detecting circuit; determine that protective circuit is working properly; then single chip circuit is given the signal of a de-preservation of earth leakage protective control circuit; make civil power break-make relay recovery closure, the self check process time is of short duration, and relay only is several milliseconds opening time.If after single chip circuit sent the simulation electric leakage signal, voltage detecting circuit still detected civil power, shows that relay does not disconnect, and sends chimes of doom, lost efficacy with the prompting protective circuit.If electrical equipment, line electrical leakage, civil power is disconnected by relay then, and single chip circuit is left intact.
See also shown in Figure 2ly, live wire and neutral line current equate under the zero sequence current mutual inductor normal condition, and direction is opposite, and cancelling each other in the magnetic field that they produce in magnet ring, is zero.Therefore, signal coil no-voltage output is when if electric leakage appears in circuit, the electric current of live wire does not return through zero line fully, but directly into ground, the electric current sum of zero line and live wire is non-vanishing, signal coil has voltage output, and this signal control relay after amplifying disconnects civil power.
See also shown in Figure 3ly, the triode Q7 that voltage detecting circuit comprises transformer T1, connects the diode D1 of transformer T1, be connected with diode D1 by resistance R 14.Wherein, transformer secondary output one end is connected to the positive pole of diode D1, other end ground connection; The resistance R 16 that is connected a ground connection between diode D1 and the resistance R 14; The grounded emitter of triode Q7, collector electrode is connected to single chip circuit.The relay K 3 that the simulation leakage circuit includes triode Q6, is connected with triode Q6.The grounded emitter of triode Q6, base stage is connected to single chip circuit by a resistance R 11.The buzzer LS1 that single chip circuit includes single-chip microcomputer IC1, triode Q5 and is connected with triode Q5.Wherein single chip circuit part also is provided with the ann reset button S1 behind the buzzer warning, the reset circuit of SCM of reporting to the police indication light-emitting diode D8 and being made up of resistance R 9 and capacitor C 6.
Civil power is exported from port CN2 through zero sequence current mutual inductor and relay K 2 backs from port CN1 input.Civil power is through capacitor C 2 step-downs, bridge rectifier D3 rectification, and the VCC voltage that obtains 5V after the filtering of capacitor C 1 is supplied with each circuit of this protective device.The 12nd pin output high level of single-chip microcomputer IC1, then triode Q5 is saturated, buzzer LS1 sounding alarm, light-emitting diode D8 is bright simultaneously.
Normally closed relay K 2 is closed during normal condition, and port CN2 has civil power output, and supplies with each electrical equipment, and single-chip microcomputer IC1 carries out countdown, and self check at regular intervals once.When the self check time then, single-chip microcomputer the 6th pin reads level, when the 6th pin level changes from high to low (as the t of Fig. 4
3Constantly), the 7th human hair combing waste of single-chip microcomputer goes out a 1ms high level pulse and simulates of short duration electric leakage, drive through triode Q6, make relay K 3 moment closure, because live wire electric current and neutral line current be excitation on magnet ring T1 not exclusively, but some is through resistance R 1 shunting, thereby the live wire size of current on the magnet ring is not equal to the neutral line current on it, live wire in the magnet ring, the excitation of zero line can not be offset fully, induction coil just produces the signal of 50HZ, through bridge rectifier D1 rectification, diode D5 amplitude limit, and triode Q1, be added to the control utmost point of thyristor Q3 after the amplification of triode Q2, because normal condition triode Q4 saturation conduction, therefore thyristor Q3 conducting, the contact of the break-make civil power of relay K 2 disconnects, and port CN2 does not have civil power output.T shown in Figure 4
5Single-chip microcomputer the 6th pin detects high level constantly, determines the protective circuit operate as normal, then t
6Constantly in order to recover mains-supplied, single-chip microcomputer the 8th pin output moment high level, triode Q4 be by moment, and thyristor Q3 is owing to immediate current ends less than holding current like this, normally closed relay K2 coil no current, and civil power passes through relay K 2 and transports to port CN2.Suppose that protective circuit does not have regular event, relay K 2 is still closed, then t
5Civil power process transformer T2 step-down constantly, diode D10 rectification, and the anti-phase back of triode Q7 obtains low level at single-chip microcomputer the 6th pin; then being judged to be protective device lost efficacy; single-chip microcomputer the 12nd pin output high level, buzzer LS1 sends chimes of doom, reports to the police up to manually removing by reset key S1.
Whether Figure 5 shows that self check process flow diagram, after the self check time arrives, disconnect because the level of T2 level output of transformer just can detect civil power when the positive half cycle of sine wave, so need wait until the t3 (see figure 4) that arrives constantly, single-chip microcomputer 6 pin are at t
3Constantly detect when becoming low level and begin the simulation electric leakage, then at t by high level
5Constantly, judge whether civil power disconnects, if normal disconnection then make relay K 2 closed again to recover connection civil power, t by detecting single-chip microcomputer 6 pin level
6Be the closed again moment of relay.If t
5Constantly detect civil power and normally disconnect and then send out chimes of doom, until the user by reset key.
Most preferred embodiment described above only is that the present invention is set forth and illustrates, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (8)
1. detection and protection apparatus for leakage; the earth leakage protective control circuit and the power supply circuits that include zero sequence current mutual inductor, are connected with zero sequence current mutual inductor is characterized in that: also include the civil power break-make relay, the voltage detecting circuit that is connected with civil power break-make relay that are connected with zero sequence current mutual inductor, be connected in single chip circuit between earth leakage protective control circuit and the voltage detecting circuit and the simulation leakage circuit that is connected with single chip circuit.
2. detection and protection apparatus for leakage as claimed in claim 1 is characterized in that: described voltage detecting circuit comprises transformer T1, connects the diode D1 of transformer T1, passes through the triode Q7 that resistance R 14 is connected with diode D1.
3. detection and protection apparatus for leakage as claimed in claim 2 is characterized in that: described transformer secondary output one end is connected to the positive pole of diode D1, other end ground connection; The resistance R 16 that is connected a ground connection between diode D1 and the resistance R 14.
4. detection and protection apparatus for leakage as claimed in claim 3 is characterized in that: the grounded emitter of described triode Q7, collector electrode is connected to single chip circuit.
5. detection and protection apparatus for leakage as claimed in claim 4 is characterized in that: the relay K 3 that described simulation leakage circuit includes triode Q6, is connected with triode Q6.
6. detection and protection apparatus for leakage as claimed in claim 5 is characterized in that: the grounded emitter of described triode Q6, base stage is connected to single chip circuit by a resistance R 11.
7. detection and protection apparatus for leakage as claimed in claim 6 is characterized in that: the buzzer LS1 that described single chip circuit includes single-chip microcomputer IC1, triode Q5 and is connected with triode Q5.
8. detection and protection apparatus for leakage as claimed in claim 7 is characterized in that: described single chip circuit part also is provided with the ann reset button S1 behind the buzzer warning, the reset circuit of SCM of reporting to the police indication light-emitting diode D8 and being made up of resistance R 9 and capacitor C 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101056022A CN101488657A (en) | 2009-02-23 | 2009-02-23 | Detection and protection apparatus for leakage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101056022A CN101488657A (en) | 2009-02-23 | 2009-02-23 | Detection and protection apparatus for leakage |
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| Publication Number | Publication Date |
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| CN101488657A true CN101488657A (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009101056022A Pending CN101488657A (en) | 2009-02-23 | 2009-02-23 | Detection and protection apparatus for leakage |
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| CN (1) | CN101488657A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013362A (en) * | 2010-11-10 | 2011-04-13 | 浙江德隆电器有限公司 | High-safety automatic resetting breaker |
| CN103944075A (en) * | 2014-05-07 | 2014-07-23 | 厦门理工学院 | Novel touch distribution box |
| CN106253216A (en) * | 2016-09-26 | 2016-12-21 | 东莞市达昌实业有限公司 | A kind of can timing earth leakage protective device |
| CN106322767A (en) * | 2015-06-23 | 2017-01-11 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater and control method |
| CN109103844A (en) * | 2018-09-27 | 2018-12-28 | 奥普家居股份有限公司 | Super bath controller with earth leakage protective device |
| CN109390906A (en) * | 2017-08-02 | 2019-02-26 | 惠而浦（中国）股份有限公司 | A kind of household electrical appliance leakage protection circuit |
| CN110907856A (en) * | 2019-12-06 | 2020-03-24 | 国网江苏省电力有限公司南通供电分公司 | Power equipment electric leakage detection system based on magnetic field monitoring |
| CN111380229A (en) * | 2020-03-19 | 2020-07-07 | 中山市乐喜电子科技有限公司 | Control method and control device of water heater system |
-
2009
- 2009-02-23 CN CNA2009101056022A patent/CN101488657A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013362A (en) * | 2010-11-10 | 2011-04-13 | 浙江德隆电器有限公司 | High-safety automatic resetting breaker |
| CN103944075A (en) * | 2014-05-07 | 2014-07-23 | 厦门理工学院 | Novel touch distribution box |
| CN106322767A (en) * | 2015-06-23 | 2017-01-11 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater and control method |
| CN106322767B (en) * | 2015-06-23 | 2019-11-05 | 青岛经济技术开发区海尔热水器有限公司 | A kind of electric heater and control method |
| CN106253216A (en) * | 2016-09-26 | 2016-12-21 | 东莞市达昌实业有限公司 | A kind of can timing earth leakage protective device |
| CN109390906A (en) * | 2017-08-02 | 2019-02-26 | 惠而浦（中国）股份有限公司 | A kind of household electrical appliance leakage protection circuit |
| CN109390906B (en) * | 2017-08-02 | 2024-02-09 | 惠而浦（中国）股份有限公司 | Leakage protection circuit for household appliances |
| CN109103844A (en) * | 2018-09-27 | 2018-12-28 | 奥普家居股份有限公司 | Super bath controller with earth leakage protective device |
| CN110907856A (en) * | 2019-12-06 | 2020-03-24 | 国网江苏省电力有限公司南通供电分公司 | Power equipment electric leakage detection system based on magnetic field monitoring |
| CN111380229A (en) * | 2020-03-19 | 2020-07-07 | 中山市乐喜电子科技有限公司 | Control method and control device of water heater system |
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Open date: 20090722 |