CN204391681U - Earth leakage protective device - Google Patents
Earth leakage protective device Download PDFInfo
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- CN204391681U CN204391681U CN201520073795.9U CN201520073795U CN204391681U CN 204391681 U CN204391681 U CN 204391681U CN 201520073795 U CN201520073795 U CN 201520073795U CN 204391681 U CN204391681 U CN 204391681U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model provides a kind of earth leakage protective device, first current transformer is through live wire, zero line, second current transformer is through PE line, first current transformer is connected with leakage current judging unit respectively with the second current transformer, leakage current judging unit be used for when the first current transformer and/or the second current transformer detect live wire, zero line and/or PE line exist Ground leakage current reach set point time, transmission warning signal to control module; Control module, is connected with main switch and PE line control switch respectively, and when receiving the warning signal of self-detection module, control main switch and PE line control switch disconnect simultaneously; Main switch, it is connected with live wire and zero line respectively, its conducting, the conducting disconnecting control live wire and zero line, open circuit; PE line control switch, it is connected with PE line, its conducting, the conducting disconnecting control PE line, open circuit.Its main switch and zero line switch and PE wiretap are synchronous.The utility model can play the effect of omnibearing protection.
Description
Technical field
The utility model relates to power domain, particularly relates to a kind of earth leakage protective device.
Background technology
Existing leakage switch or earth leakage protective device are that the unsymmetrical current △ In that phase line Leaked Current of Line to Ground produces is carried out to detection control thus reaches protection object; but it can not play a protective role when N.PE tape electricity, electric shock or fatal accident can be caused on the contrary.
Current domestic low-voltage power supply system, all according to IEC-TN standard formulation, with regard to existing defects during TN system formulates due to IEC, so just improve and occurred TN-C, TN-C-S, TN-S, but also fails to jump out the category of TN system, so defect exists all the time.In order to the defect people making up TN system have developed again the earth leakage protective device for TN system specifications; but it is same owing to researching and developing according to the specification of TN system; so only compensate for the segmental defect of TN system; and thoroughly could not solve root problem existing in TN system, cause it operationally to there is the possibility of electric shock.
Summary of the invention
The purpose of this utility model is to provide a kind of earth leakage protective device, even if also can not cause electric shock or fatal accident when N.PE tape electricity, reaches and electrical appliance is thoroughly separated with electrical network, play the effect of omnibearing protection.
In order to achieve the above object, the utility model provides a kind of earth leakage protective device, comprises leakage current test module, control module, main switch and PE line control switch, wherein:
Leakage current test module comprises leakage current judging unit, the first current transformer and the second current transformer, first current transformer is through live wire, zero line, second current transformer is through PE line, first current transformer is connected with leakage current judging unit respectively with the second current transformer, leakage current judging unit be used for when the first current transformer and/or the second current transformer detect live wire, zero line and/or PE line exist Ground leakage current reach set point time, transmission warning signal to control module;
Control module, is connected with main switch and PE line control switch respectively, and when receiving the warning signal judged from leakage current, control main switch and PE line control switch disconnect simultaneously;
Main switch, it is connected with live wire and zero line respectively, its conducting, the conducting disconnecting control live wire and zero line, open circuit;
PE line control switch, it is connected with PE line, its conducting, the conducting disconnecting control PE line, open circuit.
During enforcement, main switch, PE line control switch are respectively the contact of the Synchronization Control in a switch.
Compared with prior art, earth leakage protective device of the present utility model, even if also can not cause electric shock or fatal accident when N.PE tape electricity, reaches and electrical appliance is thoroughly separated with electrical network, play the effect of omnibearing protection.
Accompanying drawing explanation
Fig. 1 is the structure chart of an embodiment of earth leakage protective device of the present utility model;
Fig. 2 is the structure chart of another embodiment of earth leakage protective device of the present utility model;
Fig. 3 is the structure chart of earth leakage protective device one specific embodiment of the present utility model;
Fig. 4 is the structure chart of another specific embodiment of earth leakage protective device of the present utility model.
Embodiment
Due to during present TN-S system cloud gray model due to N, PE line is a bit connected, to break phase at system three-phase imbalance, single-phase earthing, triple-frequency harmonics, single-phase (wink) ground connection or N, PE work and protective grounding resistance become N line when opening a way greatly and all there is voltage and current in various degree, the casing of electrical appliance is all generally be connected on (i.e. N.PE line) on PE line, when the △ In electric current produced when LN line exists electric leakage exceedes set point, earth leakage protective device action and deenergization, reach protection object, but work as N, the just L1 line that during PE tape electricity, earth leakage protective device disconnects, L2 line, L3 line, N line, PE line is connected with the shell of electrical appliance, due to N, PE line is a bit connected, the shell being exactly electrical appliance does not disconnect with electrical appliance power supply, the shell of electrical appliance and N line are same current potential thus just may create electric shock or fatal accident.
Therefore, the utility model provides a kind of earth leakage protective device, and the PE line control switch that PE line adds a group and main switch contact Synchronization Control, to cut off PE line, makes electrical appliance thoroughly depart from power supply thus reaches the object of protection.
As shown in Figure 1, earth leakage protective device of the present utility model is applied to circuit diagram during Three-phase five-wire circuit, and earth leakage protective device of the present utility model comprises detection module 11, control module 12, main switch 13 and PE line control switch 14, wherein,
Leakage current test module 11, comprise leakage current judging unit, the first current transformer and the second current transformer, first current transformer is through live wire, zero line, second current transformer is through PE line, first current transformer is connected with leakage current judging unit respectively with the second current transformer, leakage current judging unit be used for when the first current transformer and/or the second current transformer detect live wire, zero line and/or PE line exist Ground leakage current reach set point time, transmission warning signal to control module 12;
Control module 12, is connected with main switch 13 and PE line control switch 14 respectively, and when receiving the warning signal from leakage current judging unit, control main switch 13 and PE line control switch 14 disconnect simultaneously;
Main switch 13, it is connected with live wire and zero line respectively, its conducting, the conducting disconnecting control live wire and zero line, open circuit;
PE line control switch 14, it is connected with PE line, its conducting, the conducting disconnecting control PE line, open circuit.
According to a kind of concrete execution mode, earth leakage protective device of the present utility model is applied to circuit diagram during single phase circuit.
During enforcement, as shown in Figure 3, Figure 4, main switch, PE line control switch can be respectively the contact of the Synchronization Control in a switch.
Earth leakage protective device of the present utility model is owing to adding the detection to PE line Ground leakage current; and achieve and when detecting that leakage current exceedes set point, PE line and zero line and live wire are synchronously disconnected, thus reach and make electrical appliance thoroughly depart from power supply and the object protected.
More than illustrate the utility model just illustrative; and it is nonrestrictive; those of ordinary skill in the art understand; when not departing from the spirit and scope that claims limit; many amendments, change or equivalence can be made, but all will fall in protection range of the present utility model.
Claims (2)
1. an earth leakage protective device, is characterized in that, comprises leakage current test module, control module, main switch and PE line control switch, wherein:
Leakage current test module comprises leakage current judging unit, the first current transformer and the second current transformer, first current transformer is through live wire, zero line, second current transformer is through PE line, first current transformer is connected with leakage current judging unit respectively with the second current transformer, leakage current judging unit be used for when the first current transformer and/or the second current transformer detect live wire, zero line and/or PE line exist Ground leakage current reach set point time, transmission warning signal to control module;
Control module, is connected with main switch and PE line control switch respectively, and when receiving the warning signal judged from leakage current, control main switch and PE line control switch disconnect simultaneously;
Main switch, it is connected with live wire and zero line respectively, its conducting, the conducting disconnecting control live wire and zero line, open circuit;
PE line control switch, it is connected with PE line, its conducting, the conducting disconnecting control PE line, open circuit.
2. earth leakage protective device as claimed in claim 1, it is characterized in that, main switch, PE line control switch are respectively the contact of the Synchronization Control in a switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520073795.9U CN204391681U (en) | 2015-01-30 | 2015-01-30 | Earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520073795.9U CN204391681U (en) | 2015-01-30 | 2015-01-30 | Earth leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204391681U true CN204391681U (en) | 2015-06-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520073795.9U Expired - Fee Related CN204391681U (en) | 2015-01-30 | 2015-01-30 | Earth leakage protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204391681U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539709A (en) * | 2018-05-14 | 2018-09-14 | 珠海格力电器股份有限公司 | A kind of ground wire over-current protection method, device, storage medium and electric appliance |
| WO2020174217A1 (en) * | 2019-02-28 | 2020-09-03 | Myenergi Ltd | Controlling an electrical supply to an appliance |
| GB2610847A (en) * | 2021-09-17 | 2023-03-22 | Easee As | Earth terminal solution for an electrical apparatus |
-
2015
- 2015-01-30 CN CN201520073795.9U patent/CN204391681U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539709A (en) * | 2018-05-14 | 2018-09-14 | 珠海格力电器股份有限公司 | A kind of ground wire over-current protection method, device, storage medium and electric appliance |
| WO2020174217A1 (en) * | 2019-02-28 | 2020-09-03 | Myenergi Ltd | Controlling an electrical supply to an appliance |
| GB2589812A (en) * | 2019-02-28 | 2021-06-09 | Myenergi Ltd | Controlling an electrical supply to an appliance |
| GB2589812B (en) * | 2019-02-28 | 2021-12-15 | Myenergi Ltd | Controlling an electrical supply to an appliance |
| GB2610847A (en) * | 2021-09-17 | 2023-03-22 | Easee As | Earth terminal solution for an electrical apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180307 Address after: 150000 Heilongjiang city of Harbin province Daoli District Shangzhi Street No. 188 Co-patentee after: State Grid Corporation of China Patentee after: Harbin Power Supply Company, State Grid Heilongjiang Electric Power Co., Ltd. Address before: 150700 Testing Institute of Yanshou Electric Power Bureau, Heilongjiang, Harbin Patentee before: Zhao Chunguang |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20180130 |