CN109066583B - Safe electric leakage protection system - Google Patents
Safe electric leakage protection system Download PDFInfo
- Publication number
- CN109066583B CN109066583B CN201811079162.3A CN201811079162A CN109066583B CN 109066583 B CN109066583 B CN 109066583B CN 201811079162 A CN201811079162 A CN 201811079162A CN 109066583 B CN109066583 B CN 109066583B
- Authority
- CN
- China
- Prior art keywords
- leakage
- module
- control module
- signal
- leakage protector
- 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.)
- Active
Links
Classifications
-
- 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
- H02H3/34—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 of a three-phase system
- H02H3/353—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 of a three-phase system involving comparison of phase voltages
-
- 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
- H02H3/34—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 of a three-phase system
- H02H3/343—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 of a three-phase system using phase sequence analysers
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a safe leakage protection system, which relates to the field of electrical safety and comprises: a leakage protector and a load control module; the leakage protector is used for switching off or switching on a power supply of a load; the leakage protector can send out an identification signal, and after the load control module receives the identification signal, the signal is compared with pre-stored information: if the identification signal is consistent with the pre-stored information, the load control module sends a power-on permission signal to the leakage protector; the leakage protector prohibits the power supply of the load from being turned on until the leakage protector receives the power-on permission signal; compared with the prior art, the product code of the leakage protector is verified through the water heater controller, and the leakage protector is forbidden to be electrified before verification, so that a user cannot privately replace the leakage protector, the risk of electric shock of the user is reduced, and the use safety is improved.
Description
Technical Field
The invention relates to the field of electrical safety, in particular to a safe electric leakage protection system.
Background
With the improvement of living standard, the popularization rate of the domestic water heater is also higher, and the electric shock event of using the water heater is frequent, so that the water heater needs a leakage protector to protect the safety of users, and the existing leakage protector has a plurality of defects.
The leakage protection device with the ground wire live protection disclosed in the Chinese invention CN3178492A comprises three poles of a phase line L, a zero line N and a ground wire E with switches, a zero sequence current transformer passing through the phase line L and the zero line N, a test circuit, a release, a rectifying circuit, a power supply voltage reducing circuit and a silicon controlled rectifier, and is further provided with a current detector and a dual-input-end amplifier, wherein one end of a primary coil of the current detector is connected with the ground wire E, the other end of the primary coil of the current detector is connected with the zero line N after being connected with a large-resistance current limiting voltage reducing circuit in series, a secondary coil of the current detector is connected with one input end of the dual-input-end amplifier, two output ends of the dual-input-end amplifier are respectively connected with trigger electrodes of two silicon controlled rectifiers, and the output end of the zero sequence current transformer is connected with the other input end of the dual-input-end amplifier; although the invention can detect whether the zero line, the live line and the ground line leak electricity at the same time, in actual use, a user often changes cheap inferior products when the leakage protector is damaged, so that the leakage protection system is similar to a dummy, and the user is exposed to the risk of electric shock.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the defects existing in the prior art, the safety of the existing leakage protection system is low.
2. Technical proposal
In order to solve the above problems, a safe leakage protection system is provided, which comprises: a leakage protector and a load control module;
the leakage protector provides working voltage for the load control module;
the leakage protector is used for switching off or switching on a power supply of a load;
the leakage protector can send out an identification signal, and after the load control module receives the identification signal, the signal is compared with pre-stored information:
if the identification signal is consistent with the pre-stored information, the load control module sends a power-on permission signal to the leakage protector;
the leakage protector prohibits the power supply to the load from being turned on until the leakage protector receives the power-on permission signal.
Wherein, the earth leakage protector includes:
the action module is used for executing the switching-off or switching-on of the power supply;
the leakage protection control module is used for controlling the action module to be disconnected or connected with the power supply;
the leakage detection module is used for detecting whether the earth wire, the live wire and the zero line are leaked or not, and when the leakage is detected, the leakage detection module sends out a leakage signal, and after the leakage control module receives the leakage signal, the leakage control module controls the action module to disconnect the power supply.
The leakage protector further comprises a low-voltage power supply module, and the low-voltage power supply module is used for supplying power to the load control module.
The leakage protection control module prohibits the action module from switching on the power supply of the load until the leakage protection control module receives the power-on permission signal.
The leakage protector further comprises an alternating current input module, the alternating current input module is connected with the mains supply, the alternating current input module is further electrically connected with the low-voltage power supply module and the action module respectively, and the alternating current input module is used for providing alternating current.
The leakage protector further comprises a port module, and the load control module is in communication connection with the leakage protection control module through the port module.
The port module comprises a signal isolation module, wherein the signal isolation module is used for electrically isolating an input end and an output end of a signal.
Wherein, load control module is the water heater controller.
The leakage protector completes self-checking first, and sends out identifying signal when the self-checking result is normal.
Wherein the identification signal is a product code.
3. The beneficial effects of the invention are that
Compared with the prior art, the invention verifies the product code of the leakage protector through the water heater controller, and forbids the leakage protector to be electrified before the verification is passed, so that a user cannot privately replace the leakage protector, the risk of electric shock of the user is reduced, and the use safety is improved;
the product code is sent out after the self-checking of the leakage protector is normal, so that the leakage protector cannot send out the product code when abnormal, and further the water heater cannot send out a power-on permission signal to the abnormal water heater, and the use safety is further improved.
Drawings
FIG. 1 is a block diagram of a leakage protector of the present invention;
FIG. 2 is a block diagram of embodiment 1 of the present invention;
FIG. 3 is a flow chart of embodiment 1 of the present invention;
FIG. 4 is a circuit diagram of an action module of the present invention;
FIG. 5 is a circuit diagram of a low voltage power supply module of the present invention;
FIG. 6 is a circuit diagram of a leakage detection module according to the present invention;
FIG. 7 is a circuit diagram of a drain protection control module of the present invention;
FIG. 8 is a circuit diagram of an AC input module of the present invention;
FIG. 9 is a circuit diagram of a port module of the present invention;
FIG. 10 is a circuit diagram of a load control module of the present invention;
FIG. 11 is a circuit diagram of a display module of the present invention;
fig. 12 is a flowchart of embodiment 2 of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the specific embodiment of the invention, the invention is applied to a water heater, the load is the water heater, and the load control module is a water heater controller;
the water heater controller is a water heater control circuit which takes an IC with the model of HD6273 as a core;
the leakage protection control module is a leakage protector control circuit which takes an IC with the model number of HT66F018 as a core.
Example 1:
as shown in fig. 1, after power-on, the ac input module provides working voltages for the action module, the leakage detection module and the low-voltage power module, and the low-voltage power module provides working voltages for the leakage protection control module and the port module.
As shown in fig. 2, the water heater controller is arranged on the water heater display panel, the electric leakage protector is in control communication connection with the water heater through the port module, the electric leakage protector also provides working voltage for the water heater controller through the port module, the electric leakage protector is also electrically connected with the heating rod of the water heater, the port module comprises a signal isolation module, and the signal isolation module is used for electrically isolating the input end and the output end of a signal;
as shown in fig. 3 to 10, after power-on, the leakage protection control chip U2 prohibits the power-on of the power-on coil RL1, and sends out a product code to the water heater control chip U3 through the port module, after the water heater control chip U3 receives the product code, the product code is compared with a pre-stored product code, if the comparison result is consistent, the water heater control chip U3 sends out a power-on permission signal, the pre-stored product code can be one or more, when the pre-stored product codes are consistent with one of the pre-stored product codes, the water heater control chip U3 sends out a power-on permission signal, and it is worth mentioning that a program for identifying and comparing the product code is burnt in the water heater control chip U3;
the identification signal in this embodiment is a product code, which is only one situation in actual use, and a person skilled in the art can replace the product code with a preset verification password or other codes according to actual requirements, which is not limited herein.
After the leakage protection control chip U2 receives the power-on permission signal, the leakage protection control chip U2 releases the prohibition of the power-on circuit RL1,
under the state that the leakage protection control chip U2 prohibits the power-on of the power-on coil RL1, the leakage protection control chip U2 can disregard all power-on requests, including but not limited to the fact that a user presses a reset key on the leakage protector;
the product code of the leakage protector is verified through the water heater controller, and the leakage protector is forbidden to be electrified before verification is passed, so that a user cannot privately replace the leakage protector, the risk of electric shock of the user is reduced, and the use safety is improved.
When water in the water tank needs to be heated, the water heater control chip U3 sends a heating signal to the leakage protection control chip U2 through the port module, and after the water heater control chip U3 receives the signal, the power-on coil RL1 is controlled to be electrified, so that the heating rod starts to be heated;
when the water temperature in the water tank reaches the preset temperature, the water heater control chip U3 sends a power-off signal to the leakage protection control chip U2 through the port module through the temperature detection module arranged in the water heater, and after the water heater control chip U3 receives the signal, the tripping coil RL2 is controlled to disconnect the power supply, so that the heating rod stops heating;
the leakage protector also bears the function of a relay, so that the relay in the water heater is omitted, and the cost is reduced.
When the mutual inductor ZCT1 or the mutual inductor ZCT2 detects a leakage signal, the singlechip U1 sends a leakage signal to the leakage protection control chip U2, and the leakage protection control chip U2 controls a power supply cut off by the tripping coil RL2 after receiving the leakage signal; if the ground wire is leaked, an LED lamp DL2 in the alternating current input module can be lightened to remind a user that the ground wire is electrified;
after the leakage signal disappears, a user needs to manually press a switch to reset, the power is supplied again after the reset, and then the leakage protection control chip U2 controls the power-on coil RL1 to be connected with the power supply of the water heater, so that the safety is further improved;
those skilled in the art will set the water heater controller in the water heater control board, and may also implement the functions described in this embodiment, which is not described herein.
As shown in fig. 11, the display module on the display panel is in communication connection with the water heater control chip U3, and the display module can display the real-time temperature of the water tank.
Example 2:
as shown in fig. 12, after power-up, the earth leakage protector first prohibits the power-up coil from switching on the load power supply, and then performs a self-checking procedure:
a step of detecting a mains supply time sequence signal: as shown in fig. 4, the leakage protection control chip U2 collects a timing signal of the mains supply through the mains supply detection circuit, and if the timing signal is normal, the temperature detection step is performed; if the judging module does not acquire the time sequence signal, the upper electric coil is kept prohibited from being connected with a load power supply, and a product code is not sent to the water heater control chip U3;
and a temperature detection step: the leakage protection control chip U2 detects the temperature value between the pin and the socket through a thermistor arranged in the leakage protector and compares the temperature value with a preset temperature value, in the embodiment, the preset temperature value is 180 ℃, and if the temperature value between the pin and the socket is lower than 180 ℃, the step of detecting the mains voltage is performed; if the temperature value between the pin and the socket exceeds 180 ℃, keeping to prohibit the upper electric coil from being connected with a load power supply, and not sending a product code to the water heater control chip U3;
a mains voltage detection step: as shown in fig. 4, the drain protection control chip U2 collects the voltage value of the mains supply through the mains supply detection circuit, and determines whether the voltage value of the mains supply is within a preset range, in this embodiment, the preset range is 220v±30%, and if the voltage of the mains supply is within a range of 154V to 286V, the trip coil detection step is entered; if the mains voltage is lower than 154V or higher than 286V, the power-on is kept prohibited from being connected with a load power supply, and a product code is not sent to the water heater control chip U3;
and a trip coil detection step: as shown in fig. 4, the resistor R2, the resistor R9, the resistor R23 and the capacitor C11 form a trip coil detection circuit, the leakage protection control chip U2 judges whether the trip coil is normal or not according to the voltage value output by the trip coil detection circuit, if the voltage value output by the trip coil detection module is lower than a preset value, the upper electric wire is kept prohibited from being connected with the load power supply, and a product code is not sent to the water heater control chip U3; if the current is not lower than the preset value, entering an upper electric coil detection step;
and (3) an upper electric coil detection step: as shown in fig. 4, the resistor R1, the resistor R10, the resistor R22 and the capacitor C10 form an upper electric coil detection circuit, the leakage protection control chip U2 judges whether the upper electric coil is normal or not through the voltage value output by the upper electric coil detection circuit, and if the voltage value output by the upper electric coil detection module is lower than a preset value, the upper electric coil is kept prohibited from being connected with a load power supply, and a product code is not sent to the water heater control chip U3; if the current value is not lower than the preset value, entering a transformer detection step;
finally, the transformer detection step is executed: as shown in fig. 6, the zero sequence transformer detection circuit consists of a resistor R47, a triode Q5, a diode D14 and the like;
firstly, a zero sequence transformer detection circuit simulates zero line and live line to generate electric leakage;
then the leakage protection control chip U2 detects whether the singlechip U1 sends out a leakage signal or not, and if the singlechip U1 does not send out a power-off signal; the upper electric coil is kept prohibited from being connected with the load power supply, and a product code is not sent to the water heater control chip U3;
the ground wire transformer detection circuit consists of a resistor R54, a triode Q6, a triode Q4, a diode D15 and the like;
then the ground wire transformer detection module simulates the ground wire to generate electricity leakage;
finally, the leakage protection control chip U2 detects whether the singlechip U1 sends out a leakage signal or not, and if the singlechip U1 does not send out a power-off signal; the upper electric coil is kept prohibited from being connected with the load power supply, and a product code is not sent to the water heater control chip U3; if the singlechip U1 sends out a power-off signal, the self-checking is finished, and after the self-checking is finished, a product code is sent out to the water heater control chip U3.
The product code is sent out after the self-check of the leakage protector is normal, so that the leakage protector cannot send out the product code when abnormal, and further the water heater cannot send out a power-on permission signal to the abnormal water heater, and the use safety is further improved.
The above embodiments are only for illustrating the present invention, not for limiting the present invention, and various changes and modifications may be made by one of ordinary skill in the relevant art without departing from the spirit and scope of the present invention, and therefore, all equivalent technical solutions are also within the scope of the present invention, and the scope of the present invention is defined by the claims.
Claims (9)
1. A safety earth leakage protection system, the earth leakage protection system comprising: a leakage protector and a load control module;
the leakage protector provides working voltage for the load control module;
the leakage protector is used for switching off or switching on a power supply of a load;
the leakage protector can send out an identification signal, and after the load control module receives the identification signal, the load control module compares the identification signal with pre-stored information:
if the identification signal is consistent with the pre-stored information, the load control module sends a power-on permission signal to the leakage protector;
the leakage protector prohibits the power supply of the load from being turned on until the leakage protector receives a power-on permission signal;
the leakage protector includes:
the action module is used for executing power off or power on;
the leakage protection control module is used for controlling the action module to be disconnected or connected with a power supply;
the leakage detection module is used for detecting whether the earth wire, the live wire and the zero line are leaked or not, when the leakage is detected, the leakage detection module sends out a leakage signal, and after the leakage control module receives the leakage signal, the leakage control module controls the action module to disconnect the power supply.
2. The safety earth leakage protection system of claim 1, wherein said earth leakage protector further comprises a low voltage power module for powering said load control module.
3. A safety leakage protection system according to claim 1, wherein said leakage protection control module inhibits said action module from powering on a load until said leakage protection control module receives a power-on grant signal.
4. The safety earth leakage protection system of claim 2, wherein said earth leakage protector further comprises an ac input module, said ac input module being electrically connected to a mains supply, said ac input module being further electrically connected to said low voltage power module and said action module, respectively, said ac input module being adapted to provide ac power.
5. The safety leakage protection system of claim 1, wherein the leakage protector further comprises a port module, the load control module being communicatively coupled to the leakage control module via the port module.
6. The system of claim 5, wherein the port module comprises a signal isolation module for electrically isolating the input and output of the signal.
7. A safety earth leakage protection system as defined in claim 1, wherein,
the load control module is a water heater controller.
8. The system of claim 1, wherein the earth leakage protector performs a self-test and sends out the identification signal when the self-test result is normal.
9. A safety earth leakage protection system according to claim 1, wherein said identification signal is a product code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811079162.3A CN109066583B (en) | 2018-09-17 | 2018-09-17 | Safe electric leakage protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811079162.3A CN109066583B (en) | 2018-09-17 | 2018-09-17 | Safe electric leakage protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109066583A CN109066583A (en) | 2018-12-21 |
| CN109066583B true CN109066583B (en) | 2023-09-12 |
Family
ID=64762584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811079162.3A Active CN109066583B (en) | 2018-09-17 | 2018-09-17 | Safe electric leakage protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109066583B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101124705A (en) * | 2004-09-10 | 2008-02-13 | 库帕技术公司 | System and method for circuit protector monitoring and management |
| KR20080004067U (en) * | 2007-03-20 | 2008-09-24 | 이건수 | Short circuit protect and electric shock protect device |
| CN104521327A (en) * | 2012-04-13 | 2015-04-15 | 丰唐物联技术（深圳）有限公司 | Electrical device with low voltage output and low voltage touch panel |
| CN204794356U (en) * | 2015-06-09 | 2015-11-18 | 国网山东即墨市供电公司 | Power equipment control system |
| CN106839445A (en) * | 2017-03-09 | 2017-06-13 | 广东万家乐燃气具有限公司 | A kind of electric heater control system of switching on or off electricity system |
| CN107769158A (en) * | 2017-09-27 | 2018-03-06 | 余姚市嘉荣电子电器有限公司 | A kind of safe leakage protection circuit |
| CN108375196A (en) * | 2018-04-24 | 2018-08-07 | 余姚市嘉荣电子电器有限公司 | A kind of leakage protection system of water outlet power-off |
| CN108387006A (en) * | 2018-04-24 | 2018-08-10 | 余姚市嘉荣电子电器有限公司 | A kind of water heater leakage protection system of double-direction control |
| CN108400571A (en) * | 2018-04-24 | 2018-08-14 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device of leakage-current alarm |
-
2018
- 2018-09-17 CN CN201811079162.3A patent/CN109066583B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101124705A (en) * | 2004-09-10 | 2008-02-13 | 库帕技术公司 | System and method for circuit protector monitoring and management |
| KR20080004067U (en) * | 2007-03-20 | 2008-09-24 | 이건수 | Short circuit protect and electric shock protect device |
| CN104521327A (en) * | 2012-04-13 | 2015-04-15 | 丰唐物联技术（深圳）有限公司 | Electrical device with low voltage output and low voltage touch panel |
| CN204794356U (en) * | 2015-06-09 | 2015-11-18 | 国网山东即墨市供电公司 | Power equipment control system |
| CN106839445A (en) * | 2017-03-09 | 2017-06-13 | 广东万家乐燃气具有限公司 | A kind of electric heater control system of switching on or off electricity system |
| CN107769158A (en) * | 2017-09-27 | 2018-03-06 | 余姚市嘉荣电子电器有限公司 | A kind of safe leakage protection circuit |
| CN108375196A (en) * | 2018-04-24 | 2018-08-07 | 余姚市嘉荣电子电器有限公司 | A kind of leakage protection system of water outlet power-off |
| CN108387006A (en) * | 2018-04-24 | 2018-08-10 | 余姚市嘉荣电子电器有限公司 | A kind of water heater leakage protection system of double-direction control |
| CN108400571A (en) * | 2018-04-24 | 2018-08-14 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device of leakage-current alarm |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109066583A (en) | 2018-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11622420B2 (en) | Electric grill with current protection circuitry | |
| CN101592962B (en) | Temperature control device of PTC/NTC electrical heating element | |
| CN108387006A (en) | A kind of water heater leakage protection system of double-direction control | |
| CN108375196B (en) | Leakage protection system for water outlet power failure | |
| CN108736439B (en) | Leakage protector | |
| CN109167335B (en) | Safe leakage protection method | |
| CN108400571B (en) | Leakage protector with leakage alarm | |
| CN109066583B (en) | Safe electric leakage protection system | |
| CN201464940U (en) | Temperature control device of PTC/NTC electrothermal body | |
| CN109245043B (en) | Safe electric leakage protection system | |
| CN208908358U (en) | A kind of safe leakage protection system | |
| CN109167332B (en) | Safe leakage protection method | |
| CN209029905U (en) | A kind of safe leakage protection system | |
| CN109149507B (en) | Self-checking method for leakage protector | |
| CN109818332B (en) | Leakage protector with ground wire missing protection | |
| CN209823399U (en) | Electric equipment and leakage protector control device thereof | |
| CN219801872U (en) | Leakage protector with ground wire missing protection | |
| CN208349589U (en) | A kind of water heater leakage protection system of double-direction control | |
| CN109066580B (en) | Safe earth leakage protector | |
| CN220692874U (en) | Isolated equipment | |
| US3586911A (en) | Electrical distribution system | |
| Sudame et al. | Operation of circuit breaker with authentication | |
| KR20200086940A (en) | Multi concent for cutting standby power | |
| CN118362871A (en) | Detection circuit and method for leakage protection device and leakage protection device | |
| SU982133A2 (en) | Device for protective disconnection of electric installation in ac network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |