CN105006711A - Leakage protection plug capable of converting ground wire protection mode - Google Patents

Leakage protection plug capable of converting ground wire protection mode Download PDF

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Publication number
CN105006711A
CN105006711A CN201510479830.1A CN201510479830A CN105006711A CN 105006711 A CN105006711 A CN 105006711A CN 201510479830 A CN201510479830 A CN 201510479830A CN 105006711 A CN105006711 A CN 105006711A
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CN
China
Prior art keywords
ground wire
circuit
resistance
over switch
change over
Prior art date
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Pending
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CN201510479830.1A
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Chinese (zh)
Inventor
谭文兴
史泽华
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SHENZHEN LONGWAY TECHNOLOGY Co Ltd
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SHENZHEN LONGWAY TECHNOLOGY Co Ltd
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Priority to CN201510479830.1A priority Critical patent/CN105006711A/en
Publication of CN105006711A publication Critical patent/CN105006711A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a leakage protection plug capable of converting a groundwire protection mode The plug comprises a housing, a latch, phase lines, zero lines, ground wires, a zero-sequence current transformer, a test loop, an electromagnetic releasing and latching device, a ground wire fault current detection circuit, a ground wire fault voltage detection circuit, a first change-over switch, a second change-over switch, and a unidirectional conduction circuit. Two output terminals of a secondary winding of the zero-sequence current transformer are connected in parallel with a first input terminal and a second input terminal of an amplification circuit; an output terminal of the unidirectional conduction circuit is connected with a negative electrode of a second diode and a control electrode of a first silicon controlled rectifier; and an output terminal of a ground live-line detection inductor is connected in series with the second change-over switch and then is connected with a control electrode and a cathode of a second silicon controlled rectifier. According to the leakage protection plug, selective conversion of a ground wire fault current protection mode and a ground wire fault voltage mode can be realized; a problem of mistaken tripping of the leakage protection plug can be solved; and power usage safety can be guaranteed.

Description

A kind of leakage protecting plug changing ground wire protected mode
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to a kind of leakage protecting plug changing ground wire protected mode.
Background technology
Existing leakage protecting plug is by ground wire fault current detection being divided into protect to the detection protected mode of ground wire electrification and ground wire false voltage detection protection two series products.
Chinese patent literature CN1142618C discloses a kind of leakage protecting plug that can detect ground wire fault current; on this leakage protecting plug when protection system to earth exception causes ground wire accident charged; ground wire can be detected and have non-faulty current; when ground wire fault current reaches preset threshold values, it action immediately can cut off phase line, zero line and ground wire.It can thus be appreciated that; as long as this kind of leakage protecting plug ground wire fault current reaches predetermined threshold values; leakage protecting plug will trip and with ground wire with false voltage height irrelevant; therefore; this kind of leakage protecting plug occurs causing leakage protecting plug mistrip when being greater than predetermined threshold values fault current when ground wire false voltage is lower but because of ground wire, causes people normally to use.
Chinese patent literature CN202142735U also discloses a kind of leakage protecting plug that can detect ground wire false voltage, and this kind of leakage protecting plug will automatic trip and haveing nothing to do with the size of ground wire fault current when the abnormal and ground wire false voltage of grounding system reaches predetermined threshold values.Therefore, this kind of leakage protecting plug the false voltage that ground wire exists be greater than reservation threshold induced voltage but flow through the fault current of ground wire very faint time also can cause this kind of leakage protecting plug mistrip, cause people normally to use.
For this reason, electric heater market can adapt to the earth wire charged protecting product of various power utilization environment in the urgent need to a kind of, thus the probability that minimizing returns goods after sale and keep in repair can be reached.
Summary of the invention
The object of the present invention is to provide a kind of leakage protecting plug changing ground wire protected mode; this leakage protecting plug can not only detect ground wire fault current and ground wire false voltage; selectivity conversion can also be carried out to the earth wire charged protecting function of ground wire detection failure electric current and detection failure voltage; thus both solved leakage protecting plug and cause the problem that cannot normally use because of mistrip, again reduce product after-sales service rate and maintenance cost.
Technical solution proposed by the invention is such:
A kind of leakage protecting plug changing ground wire protected mode, include shell, latch, 1st phase line and the 2nd phase line, 1st zero line and the 2nd zero line, 1st ground wire and the 2nd ground wire, the zero sequence current mutual inductor that described 2nd phase line and the 2nd zero line all pass, test loop, electromagnetic trip and locker, this electromagnetic trip and locker are by solenoid and drive circuit thereof, phase line switch contacts, zero line switch contacts, ground wire switch contacts forms, the drive circuit of described solenoid is primarily of the 1st rectification circuit, 1st controllable silicon, 1st resistance, amplifying circuit forms, one output of described zero sequence current mutual inductor secondary winding and another output are connected in parallel with the 1st input of described amplifying circuit and the 2nd input respectively, also be provided with ground wire fault current detection circuit, ground wire false voltage testing circuit, 1st change over switch, 2nd change over switch, one-way conduction circuit, 2nd diode, described ground wire fault current detection circuit is provided with ground wire electrified detection inductor, the 2nd controllable silicon, and described ground wire false voltage testing circuit is provided with the 1st electric capacity, the 2nd rectification circuit, the 3rd Resistor-Capacitor Unit, photoelectrical coupler, the 4th resistance, the 1st triode, the 5th resistance, 1st resistance one end is connected with the 1st rectification circuit DC output end positive pole, the 1st controllable silicon anode, the 1st resistance other end is connected with the power end of amplifying circuit, the 3rd foot of the 1st change over switch, ground end, the 1st controllable silicon negative electrode of amplifying circuit are connected with the 1st rectification circuit DC output end negative pole
The trigger output end of amplifying circuit is connected with the 2nd diode cathode, and the 2nd diode cathode is connected with the 1st SCR control pole, described 2nd ground wire is through ground wire electrified detection inductor, ground wire electrified detection inductor secondary winding one output is connected with the 1st rectification circuit DC output end negative pole, another output of ground wire electrified detection inductor secondary winding is connected with the 3rd foot of the 2nd change over switch, 1st foot of the 2nd change over switch is connected with the 2nd SCR control pole, and the 2nd controllable silicon anode, the positive pole of negative electrode the respectively with 1st rectification circuit DC output end, negative pole are connected, by described 1st electric capacity, the ac input end of the 2nd rectification circuit, the loop that 3rd Resistor-Capacitor Unit is in series successively is connected between the 1st described ground wire and the 1st zero line, the DC output end of the 2nd rectification circuit and the input of photoelectrical coupler are connected in parallel, photoelectrical coupler one output, 1st transistor collector is connected with the 2nd foot of the 1st change over switch, another output of photoelectrical coupler and the 4th resistance one end, 1st transistor base connects, 1st transistor emitter is connected with the 5th resistance one end, the 5th resistance other end, the 4th resistance other end is connected with the 1st rectification circuit DC output end negative pole, the input of one-way conduction circuit and the 1st transistor emitter, 5th resistance one end connects, the output of one-way conduction circuit and the 2nd diode cathode, 1st SCR control pole connects, described 1st change over switch and described 2nd change over switch link and open or close.
Also be provided with the 2nd resistance and light-emitting diode; 2nd resistance one end is connected with the 2nd foot of the 1st change over switch, and the 2nd resistance other end is connected with light-emitting diode positive pole, and light-emitting diode negative pole is connected with the 1st rectification circuit DC output end negative pole.
On described 1st change over switch and the integrated drain pan being arranged on described shell of the 2nd change over switch.
Described light-emitting diode is arranged on the face-piece of described shell.
Described one-way conduction circuit is made up of the 1st diode.
Described one-way conduction circuit is made up of the 2nd triode.
Described 3rd Resistor-Capacitor Unit is made up of resistance.
Described 3rd Resistor-Capacitor Unit is made up of electric capacity.
Described 3rd Resistor-Capacitor Unit is made up of the assembly of resistance and electric capacity.
Compared with prior art, the present invention has following remarkable result:
(1) a kind of leakage protecting plug changing ground wire protected mode of the present invention can detect the fault current that ground wire occurs; the fault current surprisingly occurred once ground wire reaches predetermined threshold values directly to be triggered controlled silicon conducting and drives solenoid work; improve reaction speed, shorten break-time; it just can immediately phase, zero, the switch contacts of ground wire all disconnects, so the present invention provides a kind of safer Electrical Safety guarantee than existing leakage protecting plug.
(2) leakage protecting plug of the present invention can detect the false voltage that ground wire occurs; the false voltage surprisingly occurred once ground wire reaches predetermined threshold values directly to be triggered controlled silicon conducting and drives solenoid work; improve reaction speed, shorten break-time; before people get an electric shock; it just can immediately phase, zero, the switch contacts of ground wire all disconnects, so the present invention provides a kind of safer Electrical Safety guarantee than existing leakage protecting plug.
(3) leakage protecting plug of the present invention goes to select the different defencive functions to ground wire electrification by change over switch; so just can select suitable earth wire charged protecting function for concrete power utilization environment; both solve existing leakage protecting plug and caused the problem that cannot normally use because of mistrip, again reduce product after-sales service rate and maintenance cost.
(4) leakage protecting plug of the present invention is due to the built-in stabilized voltage power supply of the current-limiting resistance and amplifying circuit that make use of amplifying circuit dexterously, therefore without the need to setting up stabilized voltage power supply and dropping resistor in addition, saves production cost.
A kind of leakage protecting plug changing ground wire protected mode of the present invention is mainly used in the earth leakage protective of various household electrical appliance, can make the power line of band leakage protecting plug.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram changing the leakage protecting plug of ground wire protected mode of one embodiment of the invention.
Fig. 2 is the another kind of replacement circuit schematic diagram of the one-way conduction circuit 30 shown in Fig. 1.
Embodiment
By embodiment below, the present invention is further elaborated.
Shown in Figure 1, a kind of leakage protecting plug changing ground wire protected mode, includes shell, latch, 1st phase line 1 and the 2nd phase line 4, 1st zero line 2 and the 2nd zero line 5, 1st ground wire 3 and the 2nd ground wire 6, the zero sequence current mutual inductor 17 that described 2nd phase line 4 and the 2nd zero line 5 all pass, test loop 40, electromagnetic trip and locker, this electromagnetic trip and locker are by solenoid 13 and drive circuit thereof, phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 forms, and the drive circuit of described solenoid 13 is primarily of the 1st rectification circuit 14, 1st controllable silicon 15, 1st resistance 10, amplifying circuit 16 forms, and an output of described zero sequence current mutual inductor 17 secondary winding and another output are connected in parallel with the 1st input 16-1 of described amplifying circuit 16 and the 2nd input 16-2 respectively, are also provided with ground wire fault current detection circuit, ground wire false voltage testing circuit, 1st change over switch 26-1, 2nd change over switch 26-2, one-way conduction circuit 30, 2nd diode 12, described ground wire fault current detection circuit is provided with ground wire electrified detection inductor 18, the 2nd controllable silicon 27, and described ground wire false voltage testing circuit is provided with the 1st electric capacity 19, the 2nd rectification circuit 20, the 3rd Resistor-Capacitor Unit 21, photoelectrical coupler 22, the 4th resistance 23, the 1st triode 24, the 5th resistance 25, 1st resistance 10 one end is connected with the 1st rectification circuit 14 DC output end positive pole, the 1st controllable silicon 15 anode, 1st resistance 10 other end is connected with the power end Vs1 of amplifying circuit 16, the 3rd foot 26-1-3 of the 1st change over switch 26-1, ground end GND1, the 1st controllable silicon 15 negative electrode of amplifying circuit 16 are connected with the 1st rectification circuit 14 DC output end negative pole, the trigger output end 16-3 of amplifying circuit 16 is connected with the 2nd diode 12 positive pole, and the 2nd diode 12 negative pole controls pole with the 1st controllable silicon 15 and is connected, described 2nd ground wire 6 is through ground wire electrified detection inductor 18, ground wire electrified detection inductor 18 secondary winding one output is connected with the 1st rectification circuit 14 DC output end negative pole, another output of ground wire electrified detection inductor 18 secondary winding is connected with the 3rd foot 26-2-3 of the 2nd change over switch 26-2, the 1st foot 26-2-1 of the 2nd change over switch 26-2 controls pole with the 2nd controllable silicon 27 and is connected, and the 2nd controllable silicon 27 anode, the positive pole of negative electrode the respectively with 1st rectification circuit 14 DC output end, negative pole are connected, by described 1st electric capacity 19, the ac input end of the 2nd rectification circuit 20, the loop that 3rd Resistor-Capacitor Unit 21 is in series successively is connected between the 1st described ground wire 3 and the 1st zero line 2, the DC output end of the 2nd rectification circuit 20 and the input of photoelectrical coupler 22 are connected in parallel, photoelectrical coupler 22 1 output, 1st triode 24 collector electrode is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1, another output of photoelectrical coupler 22 and the 4th resistance 23 one end, 1st triode 24 base stage connects, 1st triode 24 emitter is connected with the 5th resistance 25 one end, 5th resistance 25 other end, 4th resistance 23 other end is connected with the 1st rectification circuit 14 DC output end negative pole, the input Vi1 of one-way conduction circuit 30 and the 1st triode 24 emitter, 5th resistance 25 one end connects, the output end vo 1 of one-way conduction circuit 30 and the 2nd diode 12 negative pole, 1st controllable silicon 15 controls pole and connects, described 1st change over switch 26-1 and described 2nd change over switch 26-2 links and opens or closes.
The present invention can also be equipped with the 2nd resistance 29 and light-emitting diode 28, as shown in Figure 1,2nd resistance 29 one end is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1, the 2nd resistance other end 29 is connected with light-emitting diode 28 positive pole, light-emitting diode 28 negative pole is connected with the 1st rectification circuit 14 DC output end negative pole, and described light-emitting diode 28 is arranged on the face-piece of described shell.
In the present embodiment, on described 1st change over switch 26-1 and the integrated drain pan being arranged on described shell of the 2nd change over switch 26-2.
In the present embodiment, one-way conduction circuit 30 is made up of the 1st diode 30-1.As shown in Figure 2, one-way conduction circuit 30 can also select the 2nd triode 30-2 to form, now, the base stage of the 2nd triode 30-2 is directly connected with the input Vi1 of one-way conduction circuit 30, the emitter of the 2nd triode 30-2 is directly connected with the output end vo 1 of one-way conduction circuit 30, and the collector electrode of the 2nd triode 30-2 is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1.
In the present embodiment, described 3rd Resistor-Capacitor Unit 21 is made up of resistance, can also select and form by electric capacity or by the assembly of resistance and electric capacity.
In using, leakage protecting plug reset key is pressed, the consuming device that the closed connection mains supply of phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 is lower end provides working power.
During use, leak electricity if damaged generation occurs in the insulation of consuming device, zero sequence current mutual inductor 17 detects this electric leakage signal and the 1st input 16-1 of this signal input amplifying circuit 16 and the 2nd input 16-2, when leakage current reaches predetermined threshold values, amplifying circuit 16 trigger output end 16-3 outputs signal the conducting of triggering the 1st controllable silicon 15 and solenoid 13 is worked phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 all disconnected immediately, thus has ensured the Electrical Safety of people.
If when leakage protecting plug of the present invention is selected the 2nd change over switch 26-2 and the 1st change over switch 26-1 to be connected to ground wire fault-current protection pattern according to environment for use in advance, connect between the 1st foot 26-2-1 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2, the 2nd foot 26-2-2's of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2 is separated, meanwhile, due to linkage action between the 1st change over switch 26-1 and the 2nd change over switch 26-2, so, also connect between the 1st foot 26-1-1 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1, also disconnect between the 2nd foot 26-1-2 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1, light-emitting diode 28 is in OFF state instruction leakage protecting plug and is in ground wire fault-current protection pattern.When grounding system generation exception causes the 1st ground wire 3 and the 2nd ground wire 6 accident is charged, ground wire electrified detection inductor 18 on ground wire fault current detection circuit detects the fault current flowing through the 2nd ground wire 6 immediately and outputs signal to the 2nd controllable silicon 27, when the ground wire fault current detected is greater than predetermined current threshold, the signal that ground wire electrified detection inductor 18 secondary winding exports triggers the 2nd controllable silicon 27 conducting makes solenoid 13 work phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 all disconnects immediately, thus ensured the Electrical Safety of people better.
If when leakage protecting plug of the present invention is selected the 1st change over switch 26-1 and the 2nd change over switch 26-2 to be connected to ground wire false voltage protected mode according to environment for use in advance, the 1st foot 26-1-1's of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1 is separated, connect between the 2nd foot 26-1-2 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1, light-emitting diode 28 luminescence is lighted instruction leakage protecting plug and is in ground wire false voltage protected mode, meanwhile, due to linkage action between the 1st change over switch 26-1 and the 2nd change over switch 26-2, so, also disconnect between the 1st foot 26-2-1 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2, also connect between the 2nd foot 26-2-2 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2.When grounding system generation exception causes the 1st ground wire 3 and the 2nd ground wire 6 accident is charged, photoelectrical coupler 22 on ground wire false voltage testing circuit outputs signal to the 1st triode 24, when the ground wire false voltage detected is greater than predetermined threshold voltage, 1st triode 24 exports high level signal to one-way conduction circuit 30 conducting and triggers the 1st controllable silicon 15 conducting and solenoid 13 is worked phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 all disconnected immediately, thus has ensured the Electrical Safety of people better.

Claims (9)

1. can change the leakage protecting plug of ground wire protected mode for one kind, include shell, latch, 1st phase line and the 2nd phase line, 1st zero line and the 2nd zero line, 1st ground wire and the 2nd ground wire, the zero sequence current mutual inductor that described 2nd phase line and the 2nd zero line all pass, test loop, electromagnetic trip and locker, this electromagnetic trip and locker are by solenoid and drive circuit thereof, phase line switch contacts, zero line switch contacts, ground wire switch contacts forms, the drive circuit of described solenoid is primarily of the 1st rectification circuit, 1st controllable silicon, 1st resistance, amplifying circuit forms, one output of described zero sequence current mutual inductor secondary winding and another output are connected in parallel with the 1st input of described amplifying circuit and the 2nd input respectively, it is characterized in that: be also provided with ground wire fault current detection circuit, ground wire false voltage testing circuit, 1st change over switch, 2nd change over switch, one-way conduction circuit, 2nd diode, described ground wire fault current detection circuit is provided with ground wire electrified detection inductor, the 2nd controllable silicon, and described ground wire false voltage testing circuit is provided with the 1st electric capacity, the 2nd rectification circuit, the 3rd Resistor-Capacitor Unit, photoelectrical coupler, the 4th resistance, the 1st triode, the 5th resistance, 1st resistance one end is connected with the 1st rectification circuit DC output end positive pole, the 1st controllable silicon anode, the 1st resistance other end is connected with the power end of amplifying circuit, the 3rd foot of the 1st change over switch, ground end, the 1st controllable silicon negative electrode of amplifying circuit are connected with the 1st rectification circuit DC output end negative pole
The trigger output end of amplifying circuit is connected with the 2nd diode cathode, and the 2nd diode cathode is connected with the 1st SCR control pole, described 2nd ground wire is through ground wire electrified detection inductor, ground wire electrified detection inductor secondary winding one output is connected with the 1st rectification circuit DC output end negative pole, another output of ground wire electrified detection inductor secondary winding is connected with the 3rd foot of the 2nd change over switch, 1st foot of the 2nd change over switch is connected with the 2nd SCR control pole, and the 2nd controllable silicon anode, the positive pole of negative electrode the respectively with 1st rectification circuit DC output end, negative pole are connected, by described 1st electric capacity, the ac input end of the 2nd rectification circuit, the loop that 3rd Resistor-Capacitor Unit is in series successively is connected between the 1st described ground wire and the 1st zero line, the DC output end of the 2nd rectification circuit and the input of photoelectrical coupler are connected in parallel, photoelectrical coupler one output, 1st transistor collector is connected with the 2nd foot of the 1st change over switch, another output of photoelectrical coupler and the 4th resistance one end, 1st transistor base connects, 1st transistor emitter is connected with the 5th resistance one end, the 5th resistance other end, the 4th resistance other end is connected with the 1st rectification circuit DC output end negative pole, the input of one-way conduction circuit and the 1st transistor emitter, 5th resistance one end connects, the output of one-way conduction circuit and the 2nd diode cathode, 1st SCR control pole connects, described 1st change over switch and described 2nd change over switch link and open or close.
2. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: be also provided with the 2nd resistance and light-emitting diode; 2nd resistance one end is connected with the 2nd foot of the 1st change over switch, and the 2nd resistance other end is connected with light-emitting diode positive pole, and light-emitting diode negative pole is connected with the 1st rectification circuit DC output end negative pole.
3. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: on described 1st change over switch and the integrated drain pan being arranged on described shell of the 2nd change over switch.
4. a kind of leakage protecting plug changing ground wire protected mode according to claim 2, is characterized in that: described light-emitting diode is arranged on the face-piece of described shell.
5. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described one-way conduction circuit is made up of the 1st diode.
6. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described one-way conduction circuit is made up of the 2nd triode.
7. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of resistance.
8. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of electric capacity.
9. a kind of leakage protecting plug changing ground wire protected mode according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of the assembly of resistance and electric capacity.
CN201510479830.1A 2015-08-07 2015-08-07 Leakage protection plug capable of converting ground wire protection mode Pending CN105006711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510479830.1A CN105006711A (en) 2015-08-07 2015-08-07 Leakage protection plug capable of converting ground wire protection mode

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Application Number Priority Date Filing Date Title
CN201510479830.1A CN105006711A (en) 2015-08-07 2015-08-07 Leakage protection plug capable of converting ground wire protection mode

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CN105006711A true CN105006711A (en) 2015-10-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108011256A (en) * 2016-12-20 2018-05-08 芜湖美的厨卫电器制造有限公司 Leakage protecting plug and electric heater

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202094431U (en) * 2011-06-23 2011-12-28 刘睿刚 Leakage protection plug
CN102544930A (en) * 2012-03-07 2012-07-04 佛山市新基德电子厂有限公司 Leakage protection plug
CN104767173A (en) * 2015-03-20 2015-07-08 余姚市嘉荣电子电器有限公司 IC-free optical-coupler detection ground wire voltage abnormity electricity leakage protection device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202094431U (en) * 2011-06-23 2011-12-28 刘睿刚 Leakage protection plug
CN102544930A (en) * 2012-03-07 2012-07-04 佛山市新基德电子厂有限公司 Leakage protection plug
CN104767173A (en) * 2015-03-20 2015-07-08 余姚市嘉荣电子电器有限公司 IC-free optical-coupler detection ground wire voltage abnormity electricity leakage protection device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108011256A (en) * 2016-12-20 2018-05-08 芜湖美的厨卫电器制造有限公司 Leakage protecting plug and electric heater
CN108011256B (en) * 2016-12-20 2023-10-27 芜湖美的厨卫电器制造有限公司 Leakage protection plug and electric water heater

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Application publication date: 20151028