CN103178488A - Earth leakage protection device capable of preventing earth line from being electrified - Google Patents
Earth leakage protection device capable of preventing earth line from being electrified Download PDFInfo
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- CN103178488A CN103178488A CN2013101038590A CN201310103859A CN103178488A CN 103178488 A CN103178488 A CN 103178488A CN 2013101038590 A CN2013101038590 A CN 2013101038590A CN 201310103859 A CN201310103859 A CN 201310103859A CN 103178488 A CN103178488 A CN 103178488A
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- ground wire
- earth leakage
- protective device
- line
- leakage protective
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Abstract
The invention relates to an earth leakage protection device capable of preventing an earth line from being electrified. The earth leakage protection device comprises three poles, namely a phase line L, a zero line N and an earth line E which are respectively provided with a switch, a zero-sequence current transformer passing through the phase line L and the zero line N, a testing circuit, a release, a rectifying circuit, a power supply step-down circuit, an amplifier and a silicon controlled rectifier. The earth leakage protection device is characterized by being further provided with a current detector, another amplifier and another silicon controlled rectifier, wherein one end of a primary coil of the current detector is connected with the earth line E, the other end of the primary coil of the current detector is connected with a high-resistance current-limiting step-down circuit in series and is then connected with the zero line N, a secondary coil of the current detector is connected with the input end of another amplifier, and the output end of another amplifier is connected with a trigger electrode of another silicon controlled rectifier. The earth leakage protection device can be used for ensuring that a live tripping voltage of the earth line is not more than a safety voltage and preventing false operation and false alarm.
Description
Technical field
The present invention relates to the protective device that a kind of ground wire electrification is pressed.
Background technology
existing device with earth wire charged protecting, as all-purpose leakage protection plug, generally refer to and to disconnect when electric leakage appears in the phase zero line at protective device (plug), can disconnect when being also included within ground wire electrification, it generally comprises the phase that is connected with fixed contact by the movable contact flexure strip, zero, ground three utmost points, pass phase, zero sequence current mutual inductor between zero line, the test loop, rectifier, controllable silicon, release, pass the zero sequence current mutual inductor of ground wire, it is except detecting the load phase, have or not outside leakage current between zero line, whether also detect ground wire has leakage current to pass through, work as phase line, when zero line or ground wire leakage current occurs respectively or simultaneously, two magnetic test coils all can make release immediately with phase, zero, ground wire all disconnects, namely cut off the electricity supply, thereby effectively ensured personal safety, therefore be widely applied in household electrical appliance.
But, because the difference of power utilization environment, the difference of working condition are had higher requirement to this series products, therefore need to develop the product that structure is more simple, can adapt to better power utilization environment.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of earth leakage protective device that prevents ground wire electrification for the above-mentioned condition of prior art, can adapt to power utilization environment.
The present invention solves the problems of the technologies described above the technical scheme that adopts:
prevent the earth leakage protective device of ground wire electrification, the phase line L that comprises each belt switch, zero line N, ground wire E three utmost points, pass phase line L, the zero sequence current mutual inductor of zero line N, hookup, release, rectification circuit, the power supply step-down, amplifier, controllable silicon, it is characterized in that: a current detector also is set, another amplifier and another controllable silicon, primary coil one end of current detector is connected with ground wire E, current detector the large resistance current limliting reduction voltage circuit of primary coil other end serial connection after be connected with zero line N, the secondary coil of current detector is connected with the input of another amplifier, the output of another amplifier is connected with another silicon controlled trigger electrode.
Better, large resistance current limliting reduction voltage circuit is high-tension resistive or electric capacity.
Better, connect induced voltage between the input of zero line N, ground wire E and eliminate circuit.
Better, induced voltage elimination circuit is electric capacity.
Compared with prior art, the invention has the advantages that:
Owing between the input of zero line and ground wire, current detector being set, therefore can guarantee that ground wire live trip voltage is not more than safe voltage.
Also eliminate circuit by connect induced voltage between the input of zero line N, ground wire E, prevent from preventing because there being induced voltage to make in ground wire earth leakage protective device misoperation and the false alarm of ground wire electrification.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of the embodiment of the present invention.
Embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1; prevent the earth leakage protective device of ground wire electrification; phase line L, the zero line N, ground wire E three utmost points that comprise belt switch K; zero sequence current mutual inductor ZCT1, hookup R2, AN, release L1, rectification circuit D1, power supply reduction voltage circuit R1, amplifier IC1, the controllable silicon SCR 1 of passing phase line L, zero line N are original circuit for electric leakage protector; the output of amplifier IC1 is connected with the trigger electrode of controllable silicon SCR 1, increases current detector ZCT2, an amplifier IC2, controllable silicon SCR 2, induced voltage elimination capacitor C 1 in original leakage protection circuit.
Two ends after the primary coil one end serial connection current limliting reduction voltage circuit of current detector ZCT2 are connected with the input of zero line N, ground wire E, the secondary coil of instrument transformer ZCT2 is connected with the input of amplifier IC2, and the output of amplifier IC2 is connected with the trigger electrode of controllable silicon SCR 2.
In the present embodiment, the current limliting reduction voltage circuit is a large resistance resistance R 2.
The resistance of above-mentioned resistance R 2 should make circuit satisfy insulating requirements.
Above-mentioned resistance R 2 also can be replaced with electric capacity.
Connect capacitor C 1 between the input of above-mentioned zero line N, ground wire E and do induced voltage elimination circuit, capacitor C 1 is utilized the principle that alternating current can conducting, the induced voltage that can eliminate ground wire E not enter ground and produce on ground wire E, thus can not cause mistrip and false alarm.
When ground wire E is charged; just have voltage between zero line N and ground wire E; being connected in the primary coil of the current detector ZCT2 between zero line N and ground wire E just has electric current to flow through; the secondary coil of current detector ZCT2 can induce voltage and trigger controlled silicon conducting and make the release tripping operation of threading off to the controllable silicon SCR trigger electrode after double input end amplifier IC amplifies, thereby makes the earth leakage protective device outage that prevents ground wire electrification.
Better, above-mentioned current detector just makes the release tripping operation through number of turn proportioning first, inferior coil when ground wire voltage surpasses the 36V safe voltage.
Between above-mentioned controllable silicon SCR 2 trigger electrodes and zero line N1, capacitor C 5 is set, can prevents extraneous electrical interference signal false triggering controllable silicon SCR 2.
Between above-mentioned controllable silicon SCR 1 trigger electrode and zero line N1, capacitor C 6 is set, can prevents extraneous electrical interference signal false triggering controllable silicon SCR 1.
Regulating resistance R5 of the parallel connection of secondary windings of above-mentioned current detector ZCT2, regulating resistance R5 is the tripping voltage of line E convertibly.
Capacitor C 3 of the parallel connection of secondary windings of above-mentioned current detector ZCT2 can prevent from disturbing the signal of telecommunication to enter amplifier IC2.
Regulating resistance R4 of the parallel connection of secondary windings of above-mentioned zero sequence current mutual inductor ZCT1, regulating resistance R4 can change the leakage tripping electric current of zero line N or live wire N.
Capacitor C 2 of the parallel connection of secondary windings of above-mentioned zero sequence current mutual inductor ZCT1 can prevent from disturbing the signal of telecommunication to enter amplifier IC1.
Between above-mentioned reduction voltage circuit R1 one end and zero line N1, capacitor C 4 is set, can guarantees better the stable of amplifier IC1 and amplifier IC2 power supply.
Claims (10)
1. prevent the earth leakage protective device of ground wire electrification, the phase line L that comprises each belt switch, zero line N, ground wire E three utmost points, pass phase line L, the zero sequence current mutual inductor of zero line N, hookup, release, rectification circuit, the power supply step-down, amplifier, controllable silicon, it is characterized in that: a current detector also is set, another amplifier and another controllable silicon, primary coil one end of current detector is connected with ground wire E, current detector the large resistance current limliting reduction voltage circuit of primary coil other end serial connection after be connected with zero line N, the secondary coil of current detector is connected with the input of another amplifier, the output of another amplifier is connected with another silicon controlled trigger electrode.
2. the earth leakage protective device that prevents ground wire electrification as claimed in claim 1, it is characterized in that: described large resistance current limliting reduction voltage circuit is high-tension resistive or electric capacity.
3. the earth leakage protective device that prevents ground wire electrification as claimed in claim 1 or 2, is characterized in that: connect induced voltage between the input of described zero line N, ground wire E and eliminate circuit.
4. the earth leakage protective device that prevents ground wire electrification as claimed in claim 3 is characterized in that: it is electric capacity that described induced voltage is eliminated circuit.
5. the earth leakage protective device that prevents ground wire electrification as claimed in claim 1, is characterized in that: between described another controllable silicon trigger electrode and zero line, electric capacity is set.
6. the earth leakage protective device that prevents ground wire electrification as claimed in claim 1, is characterized in that: between a described controllable silicon trigger electrode and zero line, electric capacity is set.
7. the earth leakage protective device that prevents ground wire electrification as claimed in claim 1, is characterized in that: regulating resistance of the parallel connection of secondary windings of described current detector.
8. the earth leakage protective device that prevents ground wire electrification as claimed in claim 1, is characterized in that: electric capacity of the parallel connection of secondary windings of described current detector.
9. the earth leakage protective device that prevents ground wire electrification as claimed in claim 1, is characterized in that: regulating resistance of the parallel connection of secondary windings of described zero sequence current mutual inductor.
10. the earth leakage protective device that prevents ground wire electrification as claimed in claim 1, is characterized in that: electric capacity of the parallel connection of secondary windings of described zero sequence current mutual inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101038590A CN103178488A (en) | 2013-03-28 | 2013-03-28 | Earth leakage protection device capable of preventing earth line from being electrified |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101038590A CN103178488A (en) | 2013-03-28 | 2013-03-28 | Earth leakage protection device capable of preventing earth line from being electrified |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103178488A true CN103178488A (en) | 2013-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101038590A Pending CN103178488A (en) | 2013-03-28 | 2013-03-28 | Earth leakage protection device capable of preventing earth line from being electrified |
Country Status (1)
| Country | Link |
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| CN (1) | CN103178488A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834951A (en) * | 2020-09-07 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4933801A (en) * | 1989-04-19 | 1990-06-12 | Square D Company | Ground fault circuit interrupter |
| CN201138737Y (en) * | 2008-01-04 | 2008-10-22 | 章祖德 | Multifunctional leakage protecting equipment preventing earth wire to be charged and alarming |
| CN102354866A (en) * | 2011-08-09 | 2012-02-15 | 刘睿刚 | Electricity leakage protection plug |
| CN202259980U (en) * | 2011-09-23 | 2012-05-30 | 钱加灿 | Plug with ground wire live protection mechanism |
| CN102637982A (en) * | 2012-01-12 | 2012-08-15 | 钱加灿 | Plug with earth wire charged protection mechanism |
| CN203193240U (en) * | 2013-03-28 | 2013-09-11 | 余姚市嘉荣电子电器有限公司 | Earth leakage protection device for preventing ground wire electrification |
-
2013
- 2013-03-28 CN CN2013101038590A patent/CN103178488A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4933801A (en) * | 1989-04-19 | 1990-06-12 | Square D Company | Ground fault circuit interrupter |
| CN201138737Y (en) * | 2008-01-04 | 2008-10-22 | 章祖德 | Multifunctional leakage protecting equipment preventing earth wire to be charged and alarming |
| CN102354866A (en) * | 2011-08-09 | 2012-02-15 | 刘睿刚 | Electricity leakage protection plug |
| CN202259980U (en) * | 2011-09-23 | 2012-05-30 | 钱加灿 | Plug with ground wire live protection mechanism |
| CN102637982A (en) * | 2012-01-12 | 2012-08-15 | 钱加灿 | Plug with earth wire charged protection mechanism |
| CN203193240U (en) * | 2013-03-28 | 2013-09-11 | 余姚市嘉荣电子电器有限公司 | Earth leakage protection device for preventing ground wire electrification |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834951A (en) * | 2020-09-07 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
| WO2021212839A1 (en) * | 2020-09-07 | 2021-10-28 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit, and household appliance |
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Application publication date: 20130626 |