CN203967723U - Protective device for electric safety - Google Patents
Protective device for electric safety Download PDFInfo
- Publication number
- CN203967723U CN203967723U CN201420235901.4U CN201420235901U CN203967723U CN 203967723 U CN203967723 U CN 203967723U CN 201420235901 U CN201420235901 U CN 201420235901U CN 203967723 U CN203967723 U CN 203967723U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- ground wire
- wire
- protective device
- 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 - Fee Related
Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 20
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000001012 protector Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Abstract
A kind of protective device for electric safety comprises: circuit box (1), in circuit box (1), be provided with circuit board (2), and on circuit board (2), be connected with circuit; Its advantage is: makes simply, and easy to operate, human body, circuit and electrical equipment are played to larger protective effect, particularly child and teenager.
Description
Technical field
The utility model relates to daily living article technical field, specifically a kind of protective device for electric safety.
Background technology
Electricity uses has now become an indispensable part in people's daily life, but can be found everywhere for the generation with electrification, particularly occur in child and teenager, so the safety devices of power device are very important, and the situation of electric leakage often occurs existing power device, cause great personal safety hidden danger to people like this.
Summary of the invention
The purpose of this utility model is tighter, the safe protective device for electric safety of a kind of anticreep system of design.
A kind of protective device for electric safety of the utility model comprises: circuit box 1, in circuit box 1, be provided with circuit board 2, and on circuit board 2, be connected with circuit;
Described circuit board 2 comprises: ground wire 4, zero line 5, rectifier bridge 7, ground wire 4, zero line 5, one end of rectifier bridge 7 and being connected of earth leakage protective trigger 14, ground wire 4 is gone between and is connected with resistance R 3 by branch, and resistance R 3 is connected with switch k1 by lead-in wire, and switch k1 is the normal open switch of relay 13;
Described phase line 6 is connected with switch k1;
Described rectifier bridge 7 is connected with the first electric capacity 9 by lead-in wire; By branch go between contact resistance R1, resistance R 2, resistance R 1 is connected in series with resistance R 2; Connect with resistance R again with after voltage stabilizing didoe 8 parallel connections by the contact resistance R of branch, voltage stabilizing didoe 8, the second electric capacity 10, resistance R 4, the second electric capacity 10, resistance R 4 again; Lead-in wire between resistance R 1, resistance R 2 is connected with comparator 11, and resistance R 4, R5 are also connected with comparator 11; R5, relay 13, diode 12 are connected with triode 3.
Operation principle:
Circuit obtains operating voltage from zero line and ground wire, and in the time that between zero line and ground wire, no-voltage is poor, supply line is in normal condition, and this circuit is not worked; In the time having voltage difference between zero line and ground wire, circuit obtains working power, starts working.Comparator Lm339 obtains sampling voltage from R1 and R2 dividing potential drop, and and compare from the reference voltage of R4, the voltage difference between zero line and ground wire is less than 24V, comparator Lm339 output low level, triode cut-off, relay attonity.In the time that the voltage difference between zero line and ground wire is greater than 24V; comparator Lm339 exports positive level; drive relay work through triode; relay normally open contact K1 closure; be bordering on the leakage current (illusion) of 50mA to 14 1, earth leakage protective trigger; make earth leakage protective device produce protection action, cut off phase line, zero line, ground wire simultaneously, ensured Electrical Safety.
When one of following situation, leak guarantor's work:
1, in the time that the total zero line in Three-phase five-wire surprisingly disconnects, can cause user's monophase current to be back to other phase line through inner zero line, now, single-phase voltage constantly fluctuates with the working condition of each phase electrical appliance, can cause too high voltages formula to cross low-voltage, thus damage electrical appliance.Have after this protector, because zero line disconnects, thereby caused zero line and ground wire voltage to rise, in the time that the voltage between them exceedes 24v, protective circuit work, deenergization, indoor application electrical equipment is protected.
2, in the time that the total ground wire in Three-phase five-wire causes accident charged because of reasons such as the improper electricity consumptions of other user; because fault is not originally indoor; the earth leakage protective device of user installation is not worked; cause the protection ground wire electrification with indoor circuit, have very large potential safety hazard, had after this protector; if the super work 24v of voltage of protection ground wire; this protector can be worked, deenergization, and potential safety hazard is eliminated.
3,, when cause protecting ground wire accident charged with indoor improper electricity consumption, if nobody or other factors are guided electric current into ground wire (not forming loop), leak to protect and can not work; at this moment protect ground wire still charged; in the time of people's contact electrification body, electric current is through human body, and the earth forms loop.If electric current is more than or equal to 30mA; leak to protect and just can work; deenergization; now, because of weather, human body difference and other factors, likely can cause certain injury to contactee, have after this protector; as long as when the unexpected electrified voltage of protection ground wire is greater than 24v; the work of this protector, cuts off the electricity supply, thereby plays defencive function.
The advantage of a kind of protective device for electric safety of the utility model is: makes simply, and easy to operate, human body is played to larger protective effect, particularly child and teenager.
Brief description of the drawings
Fig. 1 is protective device for electric safety structural representation.
Fig. 2 is protective device for electric safety circuit diagram.
Embodiment
A kind of protective device for electric safety of the utility model comprises: circuit box 1, in circuit box 1, be provided with circuit board 2, and on circuit board 2, be connected with circuit;
Described circuit board 2 comprises: ground wire 4, zero line 5, rectifier bridge 7, ground wire 4, zero line 5, one end of rectifier bridge 7 and being connected of earth leakage protective trigger 14, ground wire 4 is gone between and is connected with resistance R 3 by branch, and resistance R 3 is connected with switch k1 by lead-in wire, and switch k1 is the normal open switch of relay 13;
Described phase line 6 is connected with switch k1;
Described rectifier bridge 7 is connected with the first electric capacity 9 by lead-in wire; By branch go between contact resistance R1, resistance R 2, resistance R 1 is connected in series with resistance R 2; Connect with resistance R again with after voltage stabilizing didoe 8 parallel connections by the contact resistance R of branch, voltage stabilizing didoe 8, the second electric capacity 10, resistance R 4, the second electric capacity 10, resistance R 4 again; Lead-in wire between resistance R 1, resistance R 2 is connected with comparator 11, and resistance R 4, R5 are also connected with comparator 11; R5, relay 13, diode 12 are connected with triode 3.
Claims (1)
1. a protective device for electric safety, comprising: circuit box (1), is characterized in that: in circuit box (1), be provided with circuit board (2), on circuit board (2), be connected with circuit;
Described circuit board (2) comprising: ground wire (4), zero line (5), rectifier bridge (7), ground wire (4), zero line (5), one end of rectifier bridge (7) and being connected of earth leakage protective trigger (14), ground wire (4) is gone between and is connected with resistance R 3 by branch, resistance R 3 is connected with switch k1 by lead-in wire, and switch k1 is the normal open switch of relay 13;
Described phase line (6) is connected with switch k1;
Described rectifier bridge (7) is connected with the first electric capacity (9) by lead-in wire; By branch go between contact resistance R1, resistance R 2, resistance R 1 is connected in series with resistance R 2; Connect with resistance R again with after voltage stabilizing didoe (8) parallel connection by the contact resistance R of branch, voltage stabilizing didoe (8), the second electric capacity (10), resistance R 4, the second electric capacity (10), resistance R 4 again; Lead-in wire between resistance R 1, resistance R 2 is connected with comparator (11), and resistance R 4, R5 are also connected with comparator (11); R5, relay (13), diode (12) are connected with triode (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420235901.4U CN203967723U (en) | 2014-05-09 | 2014-05-09 | Protective device for electric safety |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420235901.4U CN203967723U (en) | 2014-05-09 | 2014-05-09 | Protective device for electric safety |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203967723U true CN203967723U (en) | 2014-11-26 |
Family
ID=51928267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420235901.4U Expired - Fee Related CN203967723U (en) | 2014-05-09 | 2014-05-09 | Protective device for electric safety |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203967723U (en) |
-
2014
- 2014-05-09 CN CN201420235901.4U patent/CN203967723U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 Termination date: 20180509 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |