CN103296639A - Electric leakage warning and protection circuit - Google Patents
Electric leakage warning and protection circuit Download PDFInfo
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- CN103296639A CN103296639A CN2013101920092A CN201310192009A CN103296639A CN 103296639 A CN103296639 A CN 103296639A CN 2013101920092 A CN2013101920092 A CN 2013101920092A CN 201310192009 A CN201310192009 A CN 201310192009A CN 103296639 A CN103296639 A CN 103296639A
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Abstract
The invention discloses an electric leakage warning and protection circuit which comprises a power module, a first control module, a second control module, a zero-sequence transformer, an overcurrent sensor, a zero line electric leakage sensor, a tripping coil, a first silicon controlled rectifier, a reset switch and an electric leakage display circuit. The zero-sequence transformer, the overcurrent sensor and the zero line electric leakage sensor are sequentially arranged, resonance can be generated between the zero-sequence transformer and the zero line electric leakage sensor, the zero-sequence transformer, the overcurrent sensor and the zero line electric leakage sensor are connected with the first control module, the first control module is further connected with a control end of the first silicon controlled rectifier, the first silicon controlled rectifier and the tripping coil are serially connected with each other and are jointly arranged between an anode and a cathode of the power module, the electric leakage display circuit is provided with a second silicon controlled rectifier and a first light emitting diode, the second silicon controlled rectifier is serially connected with the first light emitting diode, and a control end of the second silicon controlled rectifier is connected with the second control module. The electric leakage warning and protection circuit has the advantage that electric leakage warning and automatic tripping protection can be implemented, so that the safety is greatly improved.
Description
Technical field
The present invention relates to the low-voltage electrical apparatus field, relate to a kind of electric leakage caution and protective circuit that can be applicable in socket or the socket in particular.
Background technology
At present, the widely used socket of people or socket great majority all do not have corresponding caution and protective device, in daily life; because of improper use; as load electric leakage occurs and may cause fire, even the situation that loss of life or personal injury occur takes place, and causes great danger for people's property.
In view of this, the inventor has this case to produce at the above-mentioned defective further investigation of existing socket or socket then.
Summary of the invention
Main purpose of the present invention is to provide a kind of electric leakage caution and protective circuit, to solve the problem whether prior art can't leak electricity and remind and protect respective load in socket or the socket.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of electric leakage caution and protective circuit, wherein, comprise power module, first control module, second control module, zero-sequence transformer, cross flow sensor, zero line electric leakage inductor, tripping coil, first controllable silicon, reset switch and electric leakage display circuit, this power module is filtered into the civil power input rectifying direct current and provides operating voltage for first control module, second control module and electric leakage display circuit; This zero-sequence transformer is arranged between live wire and the zero line, this is crossed flow sensor and is arranged on the live wire, this zero line electric leakage inductor is arranged between live wire and the zero line, this zero-sequence transformer, crossing flow sensor and zero line electric leakage inductor three sets gradually and makes zero-sequence transformer to leak electricity with zero line can to produce resonance between inductor, this zero-sequence transformer, crossing flow sensor all links to each other with first control module with zero line electric leakage inductor, this first control module also links to each other with the first silicon controlled control end, this first controllable silicon links to each other with the tripping coil serial connection and is arranged between the both positive and negative polarity of power module, the opening and closing of this tripping coil control reset switch, this electric leakage display circuit has second controllable silicon and first light-emitting diode, this second controllable silicon links to each other with first Light-Emitting Diode serial connection and is arranged between the both positive and negative polarity of power module, and this second silicon controlled control end links to each other with second control module.
Further, this power module comprises first diode, second diode, the 3rd diode, the 4th diode and filter capacitor, this first diode, second diode, the 3rd diode and the 4th diode form full bridge rectifier, and this filter capacitor is connected in parallel between the both positive and negative polarity of power module.
Further; this electric leakage caution also comprises power indicating circuit with protective circuit; this power indicating circuit is positioned at the rear end of reset switch and has continuous the 5th diode, the 7th resistance and second light-emitting diode of serial connection successively; the positive pole of the 5th diode links to each other with live wire, and the negative pole of this second light-emitting diode links to each other with zero line.
Further; this electric leakage caution also comprises zero line dangerous voltage indicating circuit with protective circuit; this zero line dangerous voltage indicating circuit is positioned at the front end of zero-sequence transformer and has continuous the 6th diode, the 3rd resistance, voltage stabilizing didoe and the 3rd light-emitting diode of serial connection successively; the positive pole of the 6th diode links to each other with zero line, and the negative pole of the 3rd light-emitting diode links to each other with ground wire.
Further; this electric leakage caution also comprises the safety ground indicating circuit with protective circuit; this safety ground indicating circuit is positioned at the front end of zero-sequence transformer and has continuous the 7th diode, the 9th resistance and the 4th light-emitting diode of serial connection successively; the positive pole of the 7th diode links to each other with live wire, and the negative pole of the 4th light-emitting diode links to each other with ground wire.
Further, this electric leakage caution also comprises overvoltage crowbar with protective circuit, and this overvoltage crowbar has and is separately positioned on live wire, zero line and ground wire first piezo-resistance, second piezo-resistance and the 3rd piezo-resistance between any two.
Further; this electric leakage caution also comprises the thunder and lightning display circuit with protective circuit; this thunder and lightning display circuit is positioned at the front end of zero-sequence transformer and has the 4th piezo-resistance; the 5th piezo-resistance; the 4th resistance; the 5th resistance; the 9th diode; the tenth diode; the 11 diode; the 8th electric capacity; the 3rd controllable silicon; the 5th light-emitting diode and the 6th resistance; the 6th resistance; the 5th light-emitting diode and the series connection of the 3rd silicon controlled both positive and negative polarity are arranged between the both positive and negative polarity of power module; the 4th piezo-resistance; the 4th resistance; the 9th diode and the 11 diode are connected in series continuous successively; the 5th piezo-resistance; the 5th resistance; the tenth diode and the 8th electric capacity are connected in series successively; the 8th electric capacity also links to each other with the negative pole of the 11 diode; the 4th resistance links to each other with the 5th resistance; the 3rd silicon controlled control end links to each other with the negative pole of the tenth diode; the 4th piezo-resistance links to each other with live wire, and the 5th piezo-resistance links to each other with zero line.
Further; this electric leakage caution also comprises test circuit with protective circuit; this test circuit comprises first resistance and the testing button that serial connection links to each other; this first resistance links to each other with the front end of zero-sequence transformer, and this testing button links to each other with the rear end of reset switch so that test circuit strides across zero-sequence transformer, crosses flow sensor and zero line electric leakage inductor.
After adopting said structure, a kind of electric leakage caution and the protective circuit that the present invention relates to, it is by arranging zero-sequence transformer and zero line electric leakage inductor, so when producing certain leakage current (generally greater than 30mA), first control module can produce control signal and give first controllable silicon so, this first controllable silicon will drive tripping coil and move to cut off reset switch, namely produce the effect of tripping operation; Then, by second control module and electric leakage display circuit, when producing electric leakage, can also make the lumination of light emitting diode of winning by second controllable silicon in the electric leakage display circuit, thereby play the effect of caution electric leakage; If when over current fault having occurred or big surge current failure having occurred, also cut off reset switch by first control module and first controllable silicon.
In addition, the present invention is by making zero-sequence transformer and zero line electric leakage inductor close to each other and can produce resonance, from making the signal of zero line electric leakage inductor can be passed to zero-sequence transformer, thereby trigger first controllable silicon by first control module, finally by tripping coil to cut off reset switch.
Description of drawings
Fig. 1 is the physical circuit figure that the present invention relates to a kind of leak electricity caution and protective circuit preferred embodiment.
Among the figure:
Power module-1; First control module-2; Second control module-3; Zero-sequence transformer-41; Cross flow sensor-42; Zero line electric leakage inductor-43; Electric leakage display circuit-5; Power indicating circuit-61; Zero line dangerous voltage indicating circuit-62; Safety ground indicating circuit-63; Overvoltage crowbar-64; Thunder and lightning display circuit-65; Test circuit-66.
Embodiment
In order further to explain technical scheme of the present invention, the present invention will be described in detail below by specific embodiment.
As shown in Figure 1; a kind of electric leakage caution and the protective circuit that the present invention relates to comprise power module 1, first control module 2, second control module 3, zero-sequence transformer 41, mistake flow sensor 42, zero line electric leakage inductor 43, tripping coil L5, the first controllable silicon Q1, reset switch S2 and electric leakage display circuit 5.
This power module 1 is filtered into the civil power input rectifying direct current and provides operating voltage for first control module 2, second control module 3 and electric leakage display circuit 5; Particularly, this power module 1 comprises the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and filter capacitor C6, this first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 form full bridge rectifier, this filter capacitor C6 is connected in parallel between the both positive and negative polarity of power module 1, so by this power module 1, can form a direct voltage source.
This zero-sequence transformer 41 is arranged between live wire L and the zero line N, this is crossed flow sensor 42 and is arranged on the live wire L, this zero line electric leakage inductor 43 is arranged between live wire L and the zero line N, this zero-sequence transformer 41, crossing flow sensor 42 and zero line electric leakage inductor 43 threes sets gradually and makes zero- sequence transformer 41 and 43 of inductors of zero line electric leakage can produce resonance, this zero-sequence transformer 41, crossing flow sensor 42 all links to each other with first control module 2 with zero line electric leakage inductor 43, this first control module 2 also links to each other with the control end of the first controllable silicon Q1, this first controllable silicon Q1 links to each other with tripping coil L5 serial connection and is arranged between the both positive and negative polarity of power module 1, the opening and closing of this tripping coil L5 control reset switch S2.
This electric leakage display circuit 5 has the second controllable silicon Q2 and first LED 1, this second controllable silicon Q2 links to each other with first LED, 1 serial connection and is arranged between the both positive and negative polarity of power module 1, and the control end of this second controllable silicon Q2 links to each other with second control module 3.
Like this, a kind of electric leakage caution and the protective circuit that the present invention relates to, it is by arranging zero-sequence transformer 41 and zero line electric leakage inductor 43, so when producing certain leakage current (generally greater than 30mA), first control module 2 can produce control signal and give the first controllable silicon Q1 so, this first controllable silicon Q1 will drive tripping coil L5 and move to cut off reset switch S2, namely produce the effect of tripping operation; Then, by second control module 3 and electric leakage display circuit 5, when producing electric leakage, can also make the LED 1 of winning luminous by the second controllable silicon Q2 in the electric leakage display circuit 5, thereby play the effect of caution electric leakage; If when over current fault having occurred or big surge current failure having occurred, also cut off reset switch S2 by first control module 2 and the first controllable silicon Q1.In addition, the present invention is by making zero-sequence transformer 41 and zero line electric leakage inductor 43 close to each other and can produce resonance, from making the signal of zero line electric leakage inductor 43 can be passed to zero-sequence transformer 41, thereby trigger the first controllable silicon Q1 by first control module 2, finally pass through tripping coil L5 to cut off reset switch S2.
As shown in Figure 1; this electric leakage caution also comprises power indicating circuit 61 with protective circuit; this power indicating circuit 61 is positioned at the rear end of reset switch S2 and has continuous the 5th diode D5, the 7th resistance R 7 and second LED 2 of serial connection successively; the positive pole of the 5th diode D5 links to each other with live wire L, and the negative pole of this second LED 2 links to each other with zero line N.So, when reset switch S2 was closure state, this second LED 2 can be lighted, thereby the indication power supply is connected.
As shown in Figure 1; this electric leakage caution also comprises zero line dangerous voltage indicating circuit 62 with protective circuit; this zero line dangerous voltage indicating circuit 62 is positioned at the front end of zero-sequence transformer 41 and has continuous the 6th diode D6, the 3rd resistance R 3, voltage stabilizing didoe D8 and the 3rd LED 3 of serial connection successively; the positive pole of the 6th diode D6 links to each other with zero line N; the negative pole of the 3rd LED 3 links to each other with ground wire E; so; when having dangerous voltage on the zero line N, can carry out indicating reminders by lighting of the 3rd LED 3.
As shown in Figure 1; this electric leakage caution also comprises safety ground indicating circuit 63 with protective circuit; this safety ground indicating circuit 63 is positioned at the front end of zero-sequence transformer 41 and has continuous the 7th diode D7, the 9th resistance R 9 and the 4th LED 4 of serial connection successively; the positive pole of the 7th diode D7 links to each other with live wire L; the negative pole of the 4th LED 4 links to each other with ground wire E; so when the 4th LED 4 was in illuminating state, the indication ground state was good.
In addition, this electric leakage caution also comprises overvoltage crowbar 64 with protective circuit, and this overvoltage crowbar 64 has and is separately positioned on live wire L, zero line N and the ground wire E first piezo-resistance RV1, the second piezo-resistance RV2 and the 3rd piezo-resistance RV3 between any two.Then; this electric leakage caution also comprises thunder and lightning display circuit 65 with protective circuit; this thunder and lightning display circuit 65 is positioned at the front end of zero-sequence transformer 41 and has the 4th piezo-resistance RV4; the 5th piezo-resistance RV5; the 4th resistance R 4; the 5th resistance R 5; the 9th diode D9; the tenth diode D10; the 11 diode D11; the 8th capacitor C 8; the 3rd controllable silicon Q3; the 5th LED 5 and the 6th resistance R 6; the 6th resistance R 6; the both positive and negative polarity series connection of the 5th LED 5 and the 3rd controllable silicon Q3 is arranged between the both positive and negative polarity of power module 1; the 4th piezo-resistance RV4; the 4th resistance R 4; the 9th diode D9 and the 11 diode D11 are connected in series continuous successively; the 5th piezo-resistance RV5; the 5th resistance R 5; the tenth diode D10 and the 8th capacitor C 8 are connected in series successively; the 8th capacitor C 8 also links to each other with the negative pole of the 11 diode D11; the 4th resistance R 4 links to each other with the 5th resistance R 5; the control end of the 3rd controllable silicon Q3 links to each other with the negative pole of the tenth diode D10; the 4th piezo-resistance RV4 links to each other with live wire L, and the 5th piezo-resistance RV5 links to each other with zero line N.So by the 9th diode D9, the tenth diode D10 and the 11 diode D11, can guarantee that the control end of the 3rd controllable silicon Q3 can be in the normal range (NR), allow the 3rd controllable silicon Q3 in operate as normal, also can avoid the 3rd controllable silicon Q3 to be burnt.
Whether can operate as normal in order to test entire circuit; this electric leakage caution also comprises test circuit 66 with protective circuit; this test circuit 66 comprises the first resistance R 1R1 and the testing button S1 that serial connection links to each other; this first resistance R 1R1 links to each other with the front end of zero-sequence transformer 41, and this testing button S1 links to each other with the rear end of reset switch S2 so that test circuit 66 strides across zero-sequence transformer 41, crosses flow sensor 42 and zero line electric leakage inductor 43.So, when people pressed testing button S1, entire circuit namely can be by test circuit 66 generation electric leakages to a certain degree, and then illustrate that entire circuit be in good working order if tripping coil L5 cuts off reset switch S2 this moment.
Between first control module 2, second control module 3 and zero-sequence transformer 41, mistake flow sensor 42 and zero line electric leakage inductor 43, also be respectively arranged with first capacitor C 1, the 5th capacitor C 5, the 4th capacitor C 4 and the 3rd capacitor C 3, this second capacitor C 2 is connected in parallel on the induction coil two ends of zero line electric leakage inductor 43, and this first capacitor C 1, the 5th capacitor C 5, the 4th capacitor C 4 and the 3rd capacitor C 3 play the effect of stopping direct current; This zero-sequence transformer 41 has zero-sequence mutual inductance coil L1, L2, and this is crossed flow sensor 42 and has overcurrent induction coil L3, and this zero line electric leakage inductor 43 has zero line electric leakage induction coil L4.
Above-described embodiment and graphic and non-limiting product form of the present invention and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present invention to its suitable variation or modification of doing.
Claims (8)
1. an electric leakage is warned and protective circuit, it is characterized in that, comprise power module, first control module, second control module, zero-sequence transformer, cross flow sensor, zero line electric leakage inductor, tripping coil, first controllable silicon, reset switch and electric leakage display circuit, this power module is filtered into the civil power input rectifying direct current and provides operating voltage for first control module, second control module and electric leakage display circuit; This zero-sequence transformer is arranged between live wire and the zero line, this is crossed flow sensor and is arranged on the live wire, this zero line electric leakage inductor is arranged between live wire and the zero line, this zero-sequence transformer, crossing flow sensor and zero line electric leakage inductor three sets gradually and makes zero-sequence transformer to leak electricity with zero line can to produce resonance between inductor, this zero-sequence transformer, crossing flow sensor all links to each other with first control module with zero line electric leakage inductor, this first control module also links to each other with the first silicon controlled control end, this first controllable silicon links to each other with the tripping coil serial connection and is arranged between the both positive and negative polarity of power module, the opening and closing of this tripping coil control reset switch, this electric leakage display circuit has second controllable silicon and first light-emitting diode, this second controllable silicon links to each other with first Light-Emitting Diode serial connection and is arranged between the both positive and negative polarity of power module, and this second silicon controlled control end links to each other with second control module.
2. a kind of electric leakage caution as claimed in claim 1 and protective circuit; it is characterized in that; this power module comprises first diode, second diode, the 3rd diode, the 4th diode and filter capacitor; this first diode, second diode, the 3rd diode and the 4th diode form full bridge rectifier, and this filter capacitor is connected in parallel between the both positive and negative polarity of power module.
3. a kind of electric leakage caution as claimed in claim 1 and protective circuit; it is characterized in that; this electric leakage caution also comprises power indicating circuit with protective circuit; this power indicating circuit is positioned at the rear end of reset switch and has continuous the 5th diode, the 7th resistance and second light-emitting diode of serial connection successively; the positive pole of the 5th diode links to each other with live wire, and the negative pole of this second light-emitting diode links to each other with zero line.
4. a kind of electric leakage caution as claimed in claim 1 and protective circuit; it is characterized in that; this electric leakage caution also comprises zero line dangerous voltage indicating circuit with protective circuit; this zero line dangerous voltage indicating circuit is positioned at the front end of zero-sequence transformer and has continuous the 6th diode, the 3rd resistance, voltage stabilizing didoe and the 3rd light-emitting diode of serial connection successively; the positive pole of the 6th diode links to each other with zero line, and the negative pole of the 3rd light-emitting diode links to each other with ground wire.
5. a kind of electric leakage caution as claimed in claim 1 and protective circuit; it is characterized in that; this electric leakage caution also comprises the safety ground indicating circuit with protective circuit; this safety ground indicating circuit is positioned at the front end of zero-sequence transformer and has continuous the 7th diode, the 9th resistance and the 4th light-emitting diode of serial connection successively; the positive pole of the 7th diode links to each other with live wire, and the negative pole of the 4th light-emitting diode links to each other with ground wire.
6. a kind of electric leakage caution as claimed in claim 1 and protective circuit; it is characterized in that; this electric leakage caution also comprises overvoltage crowbar with protective circuit, and this overvoltage crowbar has and is separately positioned on live wire, zero line and ground wire first piezo-resistance, second piezo-resistance and the 3rd piezo-resistance between any two.
7. a kind of electric leakage caution as claimed in claim 1 and protective circuit; it is characterized in that; this electric leakage caution also comprises the thunder and lightning display circuit with protective circuit; this thunder and lightning display circuit is positioned at the front end of zero-sequence transformer and has the 4th piezo-resistance; the 5th piezo-resistance; the 4th resistance; the 5th resistance; the 9th diode; the tenth diode; the 11 diode; the 8th electric capacity; the 3rd controllable silicon; the 5th light-emitting diode and the 6th resistance; the 6th resistance; the 5th light-emitting diode and the series connection of the 3rd silicon controlled both positive and negative polarity are arranged between the both positive and negative polarity of power module; the 4th piezo-resistance; the 4th resistance; the 9th diode and the 11 diode are connected in series continuous successively; the 5th piezo-resistance; the 5th resistance; the tenth diode and the 8th electric capacity are connected in series successively; the 8th electric capacity also links to each other with the negative pole of the 11 diode; the 4th resistance links to each other with the 5th resistance; the 3rd silicon controlled control end links to each other with the negative pole of the tenth diode; the 4th piezo-resistance links to each other with live wire, and the 5th piezo-resistance links to each other with zero line.
8. a kind of electric leakage caution as claimed in claim 1 and protective circuit; it is characterized in that; this electric leakage caution also comprises test circuit with protective circuit; this test circuit comprises first resistance and the testing button that serial connection links to each other; this first resistance links to each other with the front end of zero-sequence transformer, and this testing button links to each other with the rear end of reset switch so that test circuit strides across zero-sequence transformer, crosses flow sensor and zero line electric leakage inductor.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310192009.2A CN103296639B (en) | 2013-05-23 | 2013-05-23 | A kind of leakage warning and protective circuit |
| GB1508009.6A GB2527919B (en) | 2013-05-23 | 2013-11-07 | Electricity leakage warning and protection circuit |
| US14/649,905 US9401595B2 (en) | 2013-05-23 | 2013-11-07 | Electricity leakage warning |
| PCT/CN2013/001345 WO2014186926A1 (en) | 2013-05-23 | 2013-11-07 | Power leakage warning and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310192009.2A CN103296639B (en) | 2013-05-23 | 2013-05-23 | A kind of leakage warning and protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103296639A true CN103296639A (en) | 2013-09-11 |
| CN103296639B CN103296639B (en) | 2015-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310192009.2A Active CN103296639B (en) | 2013-05-23 | 2013-05-23 | A kind of leakage warning and protective circuit |
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| Country | Link |
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| CN (1) | CN103296639B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595020A (en) * | 2013-10-30 | 2014-02-19 | 葛剑优 | Earth fault breaker with safe display function |
| WO2014186926A1 (en) * | 2013-05-23 | 2014-11-27 | Ge Jianyou | Power leakage warning and protection circuit |
| CN107276024A (en) * | 2017-08-17 | 2017-10-20 | 北京志远鸿通科技有限公司 | One kind electric leakage monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050152079A1 (en) * | 2003-12-17 | 2005-07-14 | Kouichi Asai | Power supply apparatus |
| CN201975754U (en) * | 2011-03-10 | 2011-09-14 | 厦门振泰成科技有限公司 | Electric leakage overcurrent protection circuit |
| CN203243023U (en) * | 2013-05-23 | 2013-10-16 | 福一开电气有限公司 | Leakage alarm and protection circuit |
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2013
- 2013-05-23 CN CN201310192009.2A patent/CN103296639B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050152079A1 (en) * | 2003-12-17 | 2005-07-14 | Kouichi Asai | Power supply apparatus |
| CN201975754U (en) * | 2011-03-10 | 2011-09-14 | 厦门振泰成科技有限公司 | Electric leakage overcurrent protection circuit |
| CN203243023U (en) * | 2013-05-23 | 2013-10-16 | 福一开电气有限公司 | Leakage alarm and protection circuit |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014186926A1 (en) * | 2013-05-23 | 2014-11-27 | Ge Jianyou | Power leakage warning and protection circuit |
| GB2527919A (en) * | 2013-05-23 | 2016-01-06 | Jianyou Ge | Power leakage warning and protection circuit |
| GB2527919B (en) * | 2013-05-23 | 2020-04-01 | Ge Jianyou | Electricity leakage warning and protection circuit |
| CN103595020A (en) * | 2013-10-30 | 2014-02-19 | 葛剑优 | Earth fault breaker with safe display function |
| CN103595020B (en) * | 2013-10-30 | 2017-05-03 | 葛剑优 | Earth fault breaker with safe display function |
| CN107276024A (en) * | 2017-08-17 | 2017-10-20 | 北京志远鸿通科技有限公司 | One kind electric leakage monitoring device |
| CN107276024B (en) * | 2017-08-17 | 2018-08-10 | 北京志远鸿通科技有限公司 | A kind of electric leakage monitoring device |
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|---|---|
| CN103296639B (en) | 2015-12-23 |
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