CN115149504A - Maintenance type earth leakage protector - Google Patents
Maintenance type earth leakage protector Download PDFInfo
- Publication number
- CN115149504A CN115149504A CN202110350301.7A CN202110350301A CN115149504A CN 115149504 A CN115149504 A CN 115149504A CN 202110350301 A CN202110350301 A CN 202110350301A CN 115149504 A CN115149504 A CN 115149504A
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- China
- Prior art keywords
- leakage
- power
- module
- signal
- maintenance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- 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
- H02H3/325—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 involving voltage comparison
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a maintenance type leakage protector, relating to the technical field of leakage protection, comprising: the leakage protection device comprises an action module, a leakage protection control module and a leakage detection module; the action module is used for switching off and switching on the power supply of the load; the leakage protection control module is used for controlling the action module to cut off the power supply; the leakage detection module is used for detecting whether the live wire and the zero wire leak electricity or not, when the leakage is detected, the leakage detection module sends out a leakage signal, the leakage protection control module sends out a power-off signal after receiving the signal, and when the action module receives the signal; the action module cuts off the power supply of the load; the action module comprises a power-on maintaining coil and a switch; compared with the prior art, the number of the coils is reduced by arranging the coils with the power-on and maintaining functions.
Description
Technical Field
The invention relates to the technical field of leakage protection, in particular to a maintenance type leakage protector.
Background
Different standards have different requirements on the leakage protector, for example, the european standard requires that the leakage protector can automatically power off under the condition that the mains supply is powered off, and the common leakage protector adopts a combination mode of an upper power coil and a maintaining coil.
The invention discloses an intelligent leakage protector for water outlet and power failure and a control method thereof, as the invention in China 105207172A discloses, the intelligent leakage protector comprises a rectifying and voltage stabilizing circuit for supplying power, and comprises a ground wire abnormal electrification detection module, a voltage/current mode switching module, a logic control drive, a zero sequence leakage detection, a zero sequence leakage self-detection, an electrifying coil and a maintaining coil.
Disclosure of Invention
1. Technical problem to be solved
In view of the above-mentioned defects existing in the prior art, how to reduce the cost and power consumption of the existing leakage protector.
2. Technical scheme
In order to solve the above problems, a maintenance-type leakage protector is provided, which includes: the leakage protection device comprises an action module, a leakage protection control module and a leakage detection module;
the action module is used for switching off and switching on the power supply of the load;
the leakage protection control module is used for controlling the action module to disconnect the power supply;
the leakage detection module is used for detecting whether the live wire and the zero wire leak electricity or not, when the leakage is detected, the leakage detection module sends out a leakage signal, the leakage protection control module sends out a power-off signal after receiving the signal, and when the action module receives the signal; the action module cuts off the power supply of the load;
the action module comprises a power-on maintaining coil and a switch; the power-on maintaining coil is used for attracting the switch and maintaining the switch in a closed state.
The leakage protector further comprises a power module, and the power module is used for supplying power to the leakage protector.
When the action module receives a power-off signal sent by the leakage protection control module, the power-on maintaining coil stops providing a magnetic field for maintaining the switch in a closed state, and then the switch is switched off.
The power supply module is a half-wave rectification circuit.
The action module also comprises a reset circuit, and the reset circuit is used for controlling the action module to be connected with a power supply of the load.
Wherein the power-down signal is high.
Wherein, the power-off signal is at a high level with a duration of 30 ms.
3. The invention has the advantages of
Compared with the prior art, the invention reduces the number of coils, reduces the cost and also reduces the maintenance power consumption by arranging the coils with the power-on and maintenance functions.
Drawings
Fig. 1 is a circuit schematic of an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In this embodiment, the load is a water heater.
As shown in fig. 1, the rectifier circuit is a half-wave rectifier circuit and supplies power to the earth leakage protector.
When the mutual inductor ZCT1 detects that the zero line or the live wire leaks electricity, the mutual inductor ZCT1 sends a leakage signal to the leakage protection chip U1, after the leakage protection chip U1 receives the signal, 7 feet of the leakage protection chip U1 send a power-off signal, the power-off signal is a high level with the duration of 30ms, the high level enables the silicon controlled rectifier SCR1 to be conducted, and then the power-on maintaining coil L2 is short-circuited, and after the power-on maintaining coil L2 is short-circuited, the switch S1 loses a magnetic field for maintaining the closure and then breaks off the power supply of the water heater.
When the switch S2 is pressed, the thyristor SCR2 is turned on, and the voltage of 310V is directly applied to the power-on maintaining coil L2, so that the power-on maintaining coil L2 generates a strong enough magnetic field to attract the switch S1, and after 10ms, most of the voltage is divided by the voltage dividing resistor, so that the power-on coil only generates a small magnetic field enough to maintain the switch S1 in a closed state.
By arranging the coils with the power-on and maintaining functions, the number of the coils is reduced, the cost is reduced, and the power consumption of maintenance is also reduced.
The above embodiments are only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (7)
1. A maintenance-type earth-leakage protector, characterized in that it comprises: the leakage protection device comprises an action module, a leakage protection control module and a leakage detection module;
the action module is used for switching off and switching on the power supply of a load;
the leakage protection control module is used for controlling the action module to cut off the power supply;
the leakage detection module is used for detecting whether leakage occurs to the live wire and the zero wire, when the leakage is detected, the leakage detection module sends out a leakage signal, the leakage protection control module sends out a power-off signal after receiving the leakage signal, and when the action module receives the leakage signal; the action module cuts off the power supply of the load;
the action module comprises a power-on maintaining coil and a switch; and the power-on maintaining coil is used for attracting the switch and maintaining the switch in a closed state.
2. A maintenance-type earth-leakage protector as claimed in claim 1, wherein said earth-leakage protector further comprises a power module for supplying power to said earth-leakage protector.
3. A maintenance-type earth-leakage protector as claimed in claim 2, wherein when said action module receives a power-off signal from said earth-leakage protection control module, said power-on maintenance coil stops providing a magnetic field for maintaining said switch in a closed state, so as to open said switch.
4. A maintenance-type earth-leakage protector as claimed in claim 2, wherein said power supply module is a half-wave rectifier circuit.
5. A maintenance-type earth-leakage protector as claimed in claim 1, wherein said action module further comprises a reset circuit, said reset circuit is used for controlling said action module to switch on the power supply of the load.
6. A maintenance-type earth-leakage protector as claimed in claim 1, wherein said power-down signal is high.
7. A maintenance-type earth-leakage protector as claimed in claim 6, wherein said power-down signal is high for a period of 30 ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350301.7A CN115149504A (en) | 2021-03-31 | 2021-03-31 | Maintenance type earth leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350301.7A CN115149504A (en) | 2021-03-31 | 2021-03-31 | Maintenance type earth leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115149504A true CN115149504A (en) | 2022-10-04 |
Family
ID=83404669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110350301.7A Pending CN115149504A (en) | 2021-03-31 | 2021-03-31 | Maintenance type earth leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115149504A (en) |
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2021
- 2021-03-31 CN CN202110350301.7A patent/CN115149504A/en active Pending
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