CN201219092Y - Ground fault interrupter - Google Patents
Ground fault interrupter Download PDFInfo
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- CN201219092Y CN201219092Y CNU2008200942953U CN200820094295U CN201219092Y CN 201219092 Y CN201219092 Y CN 201219092Y CN U2008200942953 U CNU2008200942953 U CN U2008200942953U CN 200820094295 U CN200820094295 U CN 200820094295U CN 201219092 Y CN201219092 Y CN 201219092Y
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Abstract
The utility is suitable for circuit breaker filed, and provides a earthing failure circuit breaker comprising a tripping device, trigger device of tripping device for triggering action of tripping device, neutral-current transformer for fire wire and zero wire passing through. The circuit breaker comprises following circuit: simulated leakage current generation circuit, whose power supply input end are separately connected with fire wire and zero wire, and the connecting part is positioned at two ends of neutral-current transformer; the circuit generates simulated leakage current and outputs a first control signal; input end of leakage protection circuit is connected with the neutral-current transformer; the circuit outputs a second control signal according to induction electromotive force produced by the neutral-current transformer; alarming trigger circuit, for producing a trigger signal to the tripping trigger according to the first control signal outputted by simulated leakage current generation circuit and the second control signal outputted by the leakage protection circuit. The utility employs simple circuit and accomplishes self-checking for earthing failure circuit breaker.
Description
Technical field
The utility model belongs to field of circuit breakers, relates in particular to a kind of ground-fault interrupter.
Background technology
Ground-fault interrupter is a kind of earth leakage protective electronic installation of commonplace use.Owing to environment for use, the improper or long-term use of installation cause reasons such as components and parts damage, may make this electronic installation that defencive function can not correctly be provided, at this moment, will there be the potential safety hazard that causes the person and property damage because of electric leakage.
At present, also some possesses the ground-fault interrupter of intelligent self-checking function, but their circuit structure is generally comparatively complicated, such as: use a large amount of discrete components, also can increase cost and power consumption simultaneously, but also can increase the probability that circuit breaks down; Also have the circuit of its self-checking function part to need to use separately a single-chip microcomputer, further increase the cost and the power consumption of product.
The utility model content
The purpose of this utility model is to provide a kind of ground-fault interrupter, is intended to solve under prior art, and the circuit structure complexity of the self-checking function of ground-fault interrupter part, and need the problem of a single-chip microcomputer of use separately.
The utility model embodiment is achieved in that a kind of ground-fault interrupter, comprises release, triggers the release trigger of described release action and the zero sequence current mutual inductor that inside has live wire and zero line to pass, and described circuit breaker comprises following circuit:
Simulation leakage current generating circuit, its power input is connected on live wire and the zero line, and tie point is positioned at the two ends of described zero sequence current mutual inductor; This circuit produces the simulation leakage current and exports first control signal;
Leakage protection circuit, its input is connected to described zero sequence current mutual inductor; This circuit is exported second control signal according to the induced electromotive force that described zero sequence current mutual inductor produces; And
Alarm trigger circuit according to first control signal of described simulation leakage current generating circuit output and second control signal of described leakage protection circuit output, produces a triggering signal to described dropout trigger.
In the utility model, self check partly comprises simulation leakage current generating circuit, leakage protection circuit and alarm trigger circuit, has wherein used the leakage protection circuit that is used to receive the leakage current detection signal and exports control signal; Produce the simulation leakage current by simulation leakage current generating circuit; when zero sequence current mutual inductor or leakage protection circuit break down and cause leakage protection circuit only to export the control signal of leakage current state; alarm trigger circuit is by detecting the control signal of simulation leakage current generating circuit and leakage protection circuit output; trigger release in a short period of time and move deenergization.Thereby reached the self check that realizes circuit breaker with ball bearing made using.
Description of drawings
Fig. 1 is the structure principle chart of the ground-fault interrupter that provides of the utility model embodiment;
Fig. 2 is the physical circuit figure of the ground-fault interrupter that provides of the utility model embodiment;
Fig. 3 is NOR gate circuit output and the logic true value table of importing among Fig. 2.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
In the utility model embodiment; in circuit breaker, add a simulation leakage current generating circuit; this circuit is used for producing the simulation leakage current and export control signal when the line voltage value being in a certain scope; and the leakage protection circuit that is used to receive the leakage current detection signal and exports control signal; and detect the control signal of simulation leakage current generating circuit and leakage protection circuit output by alarm trigger circuit, when zero sequence current mutual inductor or leakage protection circuit break down, trigger and report to the police.Thereby reach the self check that realizes circuit breaker with ball bearing made using.
Fig. 1 shows the structural principle of the ground-fault interrupter that the utility model embodiment provides, and for convenience of description, only shows the part relevant with the utility model embodiment.
Whether zero sequence current mutual inductor Z1 is used for testing circuit leakage current, and inside has live wire and zero line to pass; Simulate leakage current generating circuit 101 and be used for producing the simulation leakage current and exporting first control signal, its power input correspondence is connected in passes zero sequence current mutual inductor Z1 live wire before and passes zero sequence current mutual inductor Z1 zero line afterwards.When the line voltage value is in a certain scope, for example in a bit of time on the positive half cycle peak value of grid voltage waveform both sides, produces the simulation leakage current, and export first control signal; Zero sequence current mutual inductor Z1 has leakage current or simulation leakage current time output induced electromotive force detecting circuit, and the induced electromotive force that leakage protection circuit 102 receives the generation of zero sequence current mutual inductor Z1 is exported second control signal; Alarm trigger circuit 103 connects first control signal output ends of simulation leakage current generating circuit 101 and second control signal output ends of leakage protection circuit 102; and second control signal generation, one triggering of exporting according to first control signal and the leakage protection circuit 102 of 101 outputs of simulation leakage current generating circuit controls signal to dropout trigger 104; trigger releases 105 action of threading off by dropout trigger 104; the effect of release 105 is equivalent to a switch, so represent by a switch S 2 and a tripping coil U0 among the utility model embodiment.
Among the utility model embodiment; when zero sequence current mutual inductor Z1 and leakage protection circuit 102 are in malfunction; in a short period of time; alarm trigger circuit 103 produces a triggering signal to dropout trigger 104 according to first control signal of simulation leakage current generating module 101 outputs and second control signal of leakage protection circuit 102 outputs; dropout trigger 104 triggers the releases action of threading off, open circuit.Circuit breaker can not be worked when zero sequence current mutual inductor Z1 and leakage protection circuit 102 are in malfunction, thereby has realized self check.
The ground-fault interrupter that the utility model embodiment provides further comprises failure alarm circuit 106, it is connected in the tripping coil U0 two ends in the release 105, be used for when the coil of tripping coil U0 opens circuit, send the warning reminding user, specifically can be by type of alarms such as buzzing or warning lamps.
Fig. 2 shows the particular circuit configurations of the ground-fault interrupter that the utility model embodiment provides, and for convenience of description, only shows the part relevant with the realization of self-checking function.Among Fig. 2, leakage protection circuit 102 adopts circuit U 1 and peripheral circuit thereof to realize, dropout trigger 104 adopts controllable silicon Q1 that release 105 is controlled, and can also adopt other implementation when should be appreciated that concrete enforcement.
Please refer to Fig. 2, the same live wire and the zero line of all passing of zero sequence current mutual inductor Z1 with the inside of zero line ground fault detector Z2, first output of zero sequence current mutual inductor Z1 is connected to the first input end 1 of circuit U 1 by capacitor C 1, second output of zero sequence current mutual inductor Z1 is directly received second input 3 of circuit U 1, when leakage current, the vector of the electric current that live wire in the zero sequence current mutual inductor Z1 and zero line flow through and non-vanishing, zero sequence current mutual inductor Z1 produces induced electromotive force signal and exports to circuit U 1, and circuit U 1 is exported a control signal by output 5 after this signal is amplified shaping.Zero potential port 4 ground connection of circuit U 1, first input end 1 is connected by resistance R 3 with port 7; Port 6 is an Enable Pin, and power supply gives circuit U 1 power supply by Enable Pin.
In the utility model embodiment, simulation leakage current generating circuit 101 comprises voltage stabilizing didoe D1, photoelectrical coupler U3, diode D2 and resistance R 5.Pass zero sequence current mutual inductor live wire before and connect its first input end, connect successively again voltage stabilizing didoe D1, photoelectrical coupler U3, diode D2 and resistance R 5, be connected to by its second input at last and pass described zero sequence current mutual inductor Z1 and zero line ground fault detector Z2 zero line afterwards, power Vcc is connected with the collector electrode of phototriode among the photoelectrical coupler U3 by resistance R 1, be this phototriode power supply, the grounded emitter of this phototriode.
It will be appreciated by those skilled in the art that; second input of simulation leakage current generating circuit 101 can be connected to the optional position of passing described zero sequence current mutual inductor Z1 zero line afterwards; the first input end of perhaps simulating leakage current generating circuit 101 connects and passes described zero sequence current mutual inductor Z1 zero line before; the second input termination is passed the live wire after the described zero sequence current mutual inductor Z1, does not break away from the scope of the utility model protection.
In line voltage is in a bit of time on the positive half cycle peak value of its waveform both sides, line voltage makes voltage stabilizing didoe D1 conducting, above-mentioned voltage stabilizing didoe D1, light-emitting diode in the photoelectrical coupler U3, produce electric current on the series circuit that diode D2 and resistance R 5 are formed, and because this series circuit is connected on the periphery of zero sequence current mutual inductor Z1 and zero line ground fault detector Z2, this electric current is walked around zero sequence current mutual inductor Z1 through series circuit and is passed zero sequence current mutual inductor Z1 by zero line again, therefore, in the zero sequence current mutual inductor Z1 live wire and zero line flow through current phasor and non-vanishing.Thereby reach the effect that when line voltage is in a bit of time on the positive half cycle peak value of its waveform both sides, produces the simulation leakage current of similar leakage current automatically.
Manual test switch S 1-TEST also is connected in the connect two ends of branch road of light-emitting diode in voltage stabilizing didoe D1 and the photoelectrical coupler U3.When manual test switch S 1-TEST connects, light-emitting diode in voltage stabilizing didoe D1 and the photoelectrical coupler U3 is by short circuit, be in the positive half cycle of its waveform and during at line voltage greater than the conducting voltage of diode D2, produce electric current on the series circuit that diode D2 and resistance R 5 are formed, this electric current is walked around zero sequence current mutual inductor through the series circuit of diode D2 and resistance R 5 compositions and is just passed zero sequence current mutual inductor by zero line, what can make live wire and zero line in the zero sequence current mutual inductor equally flows through current phasor and non-vanishing, thereby has manually produced the simulation leakage current of similar leakage current.This circuit provides the method that a kind of manual test circuit breaker whether can operate as normal to the user, specific as follows shown in.
When producing the simulation leakage current when the voltage stabilizing didoe D1 conducting in the simulation leakage current generating circuit 101, the light-emitting diode of photoelectrical coupler U3 is luminous because there is electric current to pass through, phototriode is subjected to conducting behind the light, current collection this moment low level very, the input A correspondence of NOR gate circuit U4 also is a low level; So the light-emitting diode of photoelectrical coupler U3 is not because no current passes through not luminous when having the simulation leakage current generating in the simulation leakage current generating circuit 101, just not conducting of phototriode, current collection this moment high level very, the input A of NOR gate circuit U4 then have the high level input.Fig. 3 shows the logic true value table of NOR gate circuit U4.Be high level at input A, input B, when perhaps being low level, output C output low level; At input A is high level, and when input B was low level, output C exported high level; At input A is low level, and when input B was high level, output C exported high level.
The turn-on condition of controllable silicon Q1 is: add forward voltage between anode and the negative electrode, trigger electrode has triggering signal simultaneously.In the circuit shown in Figure 2, the anode of controllable silicon Q1 and negative electrode are added with forward voltage all the time, and when the output voltage V o of the output 3 of monostable flipflop U2 was high level, controllable silicon Q1 was conducting, and then trigger the release action of threading off, and cut off the electricity supply.
The stable state of monostable flipflop U2 is output as low level, and after the low level that is subjected to NOR gate circuit U4 output C output triggered, the output voltage V o of output 3 remained high level in the time of a fixed length.At this moment, the luminous warning of light-emitting diode D3, controllable silicon Q1 conducting triggers making release action, deenergization.
When zero sequence current mutual inductor Z1 and leakage protection circuit 102 were in normal operating conditions, circuit had following several situation:
When not electric leakage of external circuit, when the user presses manual test switch S 1-TEST, light-emitting diode in voltage stabilizing didoe D1 and the photoelectrical coupler U3 is by short circuit, the light-emitting diode no current of photoelectrical coupler U3 passes through, so its not conducting of phototriode, so the input A of NOR gate circuit U4 is a high level; Be in the positive half cycle of its waveform and during greater than the conducting voltage of diode D2, zero sequence current mutual inductor Z1 has induced electromotive force output at line voltage, then leakage protection circuit 102 output high level are to the input B of NOR gate circuit U4; Input A is a high level, and so input B high level is the output C output low level of NOR gate circuit U4.Monostable flipflop U2 is triggered, and the output voltage V o of its output 3 is a high level, the luminous warning of light-emitting diode D3 conducting, and controllable silicon Q1 conducting triggers to make the release action of threading off, deenergization, thereby proof circuit breaker energy operate as normal.Otherwise proof circuit breaker cisco unity malfunction.
When external circuit does not have electric leakage and simulation leakage current generating circuit 101 not to have the simulation leakage current that produces automatically, the output of zero sequence current mutual inductor Z1 influence electricity kinetic potential, then leakage protection circuit 102 output low levels are to the input B of NOR gate circuit U4; The light-emitting diode no current of photoelectrical coupler U3 passes through, not conducting of phototriode, and the input A of NOR gate circuit U4 is a high level; Input B is a low level, and input A is a high level, so the output C of NOR gate circuit U4 output high level.Monostable flipflop U2 is not triggered, and its output end vo is a low level, thereby light-emitting diode D3 is not luminous, yet not conducting of controllable silicon Q1, the release action of not threading off.
When external circuit when electric leakage and simulation leakage current generating circuit 101 do not have the simulation leakage current to produce, as mentioned above, in the zero sequence current mutual inductor Z1 live wire and zero line flow through current phasor and non-vanishing and produce induced electromotive force, and export to leakage protection circuit 102; The output 5 output high level of leakage protection circuit 102 are to the input B of NOR gate circuit U4; The light-emitting diode of photoelectrical coupler U3 has electric current to pass through, the phototriode conducting, and output low level is to the input A of NOR gate circuit U4; Input B is a high level, and input A is a low level, so the C of NOR gate circuit U4 end output high level.Monostable flipflop U2 is not triggered, and its output end vo is a low level, thereby light-emitting diode D3 is not luminous, yet not conducting of controllable silicon Q1, the release action of not threading off.
When simulating the simulation leakage current of the automatic generation of leakage current generating circuit 101 nothings when the external circuit electric leakage, zero sequence current mutual inductor Z1 exports induced electromotive force, so the output 5 output high level of leakage protection circuit 102 are to the input B of NOR gate circuit U4; The light-emitting diode no current of photoelectrical coupler U3 passes through, not conducting of phototriode, and the input A of NOR gate circuit U4 is a high level; Input B is a high level, and input A is a high level, so the output C output low level of NOR gate circuit U4.Monostable flipflop U2 is triggered, and the output voltage V o of its output 3 is a high level, the luminous warning of light-emitting diode D3 conducting, and controllable silicon Q1 conducting triggers to make the release action of threading off, and deenergization plays the effect of protection.
When external circuit leaked electricity and the simulation leakage current of automatic generation is arranged, zero sequence current mutual inductor Z1 exported induced electromotive force, and the output 5 output high level of leakage protection circuit 102 are to the input B of NOR gate circuit U4; The light-emitting diode of photoelectrical coupler U3 has electric current to pass through, and phototriode is switched on, so output low level is to the input A of NOR gate circuit U4; Input B is a high level, and input A is a low level, so the C of NOR gate circuit U4 end output high level.Monostable flipflop U2 does not trigger, and the output voltage V o of its output 3 is a low level, and light-emitting diode D3 is not luminous, also not conducting of controllable silicon Q1, and circuit does not trigger the release action.
This situation is to be the simulation leakage current that automatically produces or external circuit leakage current and the error that causes because circuit can't be judged this leakage current.But at a bit of time past tense on the peak value both sides of the positive half cycle of line voltage, the simulation leakage current that produces disappears automatically, and can the make an immediate response electric leakage of external circuit of circuit makes circuit triggers make the release action, and deenergization specifically as mentioned above.Because a bit of time on the peak value both sides of the positive half cycle of line voltage is very short, is generally several milliseconds, so this fault phenomenon is very little to the substantial effect of circuit.
When if zero sequence current mutual inductor Z1 or leakage protection circuit U1 are in malfunction, arrive can the making voltage stabilizing didoe D1 conducting of the nearly peak value of positive half cycle and produce the simulation leakage current at line voltage one, the light-emitting diode of photoelectrical coupler U3 is because of there being electric current luminous, thereby make the phototriode conducting, output low level is to NOR gate circuit U4 input A; Because zero sequence current mutual inductor Z1 or leakage protection circuit U1 break down, zero sequence current mutual inductor Z1 detects less than leakage current or simulation leakage current, perhaps leakage protection circuit U1 fault can only output low level, and such output low level given NOR gate circuit U4 input B; NOR gate circuit U4 exports ground level, and monostable flipflop U2 is triggered, and the output voltage V o of its output 3 is a high level; make the luminous warning of light-emitting diode D3 conducting, controllable silicon Q1 conducting, circuit triggers makes the release action of threading off; deenergization plays a protective role.
When zero sequence current mutual inductor Z1 or leakage protection circuit U1 were in malfunction, there was leakage current the outside, because the output of leakage protection circuit U1 can not reflect leakage current is arranged and to export high level, an output low level is given NOR gate circuit U4 input B; Again owing to the cycle of line voltage is very short, it is at most a few tens of milliseconds, simulation leakage current generating circuit will produce above-mentioned analog current and output low level to NOR gate circuit U4 input A, thereby the output voltage V o that triggers monostable flipflop U2 output 3 in the time of a fixed length remains high level.At this moment, the luminous warning of light-emitting diode D3, controllable silicon Q1 conducting triggers making release action, deenergization.So when zero sequence current mutual inductor Z1 or leakage protection circuit U1 were in malfunction, circuit breaker one inserted power supply, the self-checking circuit action deenergization of threading off soon.The user repeatedly inserts power supply with circuit breaker, when finding all to occur this phenomenon, can judge that the zero sequence current mutual inductor Z1 of circuit breaker or leakage protection circuit U1 break down.
When tripping coil U0 just often, flow through two parallel branches: the total current itself of resistance R 6 and light-emitting diode D4 series arm and tripping coil U0 branch road is just very little, again because the resistance of resistance R 6 is bigger, electric current by light-emitting diode D4 is less, and deficiency is so that light-emitting diode D4 conducting and luminous; When tripping coil U0 coil opened circuit, whole electric currents will be by light-emitting diode D4, thereby made light-emitting diode D4 conducting and luminous.C4 is breakdown when filter capacitor, and perhaps during the rectifier diode short circuit among the rectifier bridge D5, the electric current by light-emitting diode D4 increases rapidly, causes light-emitting diode D4 conducting and luminous, thereby plays the effect of warning.
Therefore, when the light-emitting diode D4 in the failure alarm circuit 106 is luminous, the user can judge that the tripping coil U0 coil in the circuit breaker opens circuit, filter capacitor C4 is breakdown or rectifier bridge D5 in the rectifier diode short circuit.
In the utility model embodiment, produce the simulation leakage current by simulation leakage current generating circuit 101, when zero sequence current mutual inductor Z1 or leakage protection circuit 102 break down and the control signal of state of leakage current can't output circuit be arranged, alarm trigger circuit 103 can be by detecting the control signal of simulation leakage current generating module 101 and leakage protection circuit 102 outputs, triggers the release action of threading off in a short period of time; The higher resistance R 6 of resistance is connected a light-emitting diode D4 as failure alarm circuit 106, and this circuit is in parallel with tripping coil; Coil at tripping coil U0 opens circuit, when the rectifier diode short circuit of rectifier bridge D5 or filter capacitor C4 puncture, light-emitting diode is luminous because the electric current that passes through increases, and reaches the warning purpose.The utility model embodiment passes through simple circuit, and utilizes the leakage protection circuit 102 of ground-fault interrupter, has realized the self-checking function of ground-fault interrupter.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1, a kind of ground-fault interrupter comprises release, triggers the dropout trigger of described release action and the zero sequence current mutual inductor that inside has live wire and zero line to pass, and it is characterized in that described circuit breaker comprises following circuit:
Simulation leakage current generating circuit, its power input is connected on live wire and the zero line, and tie point is positioned at the two ends of described zero sequence current mutual inductor; This circuit produces the simulation leakage current and exports first control signal;
Leakage protection circuit, its input is connected to described zero sequence current mutual inductor; This circuit is exported second control signal according to the induced electromotive force that described zero sequence current mutual inductor produces; And
Alarm trigger circuit according to first control signal of described simulation leakage current generating circuit output and second control signal of described leakage protection circuit output, produces a triggering signal to described dropout trigger.
2, ground-fault interrupter as claimed in claim 1 is characterized in that, described circuit breaker also comprises:
Failure alarm circuit, it is connected the tripping coil two ends of described release, and this circuit is reported to the police when the tripping coil of described release breaks down.
3, ground-fault interrupter as claimed in claim 1; it is characterized in that; the first input end of described leakage protection circuit is connected to first output of described zero sequence current mutual inductor by an electric capacity, and second input of described leakage protection circuit is connected to second output of described zero sequence current mutual inductor.Described earth leakage protective circuit output end is exported second control signal and is given alarm trigger circuit.
4, ground-fault interrupter as claimed in claim 1 is characterized in that, described simulation leakage current generating circuit comprises:
Voltage stabilizing didoe, its negative electrode is connected with the first input end of simulation leakage current generating circuit;
Photoelectrical coupler comprises a light-emitting diode and a phototriode; The positive pole of its light-emitting diode is connected with the anode of described voltage stabilizing didoe, and the collector electrode of its phototriode is connected to an external power source; And
Diode, its anode is connected with the negative electrode of light-emitting diode in the described photoelectrical coupler, and its cathodic electricity is connected to second input of simulation leakage current generating circuit.
5, ground-fault interrupter as claimed in claim 1 is characterized in that, described alarm trigger circuit comprises:
One NOR gate circuit, two input are connected with the collector electrode of phototriode and the output of described leakage protection circuit in the described photoelectrical coupler respectively;
One monostable flipflop, it is connected with the output of described NOR gate circuit.
6, ground-fault interrupter as claimed in claim 1 is characterized in that, described release trigger is a controllable silicon, and described silicon controlled trigger electrode is connected with the output of described monostable flipflop.
7, ground-fault interrupter as claimed in claim 6 is characterized in that, described silicon controlled trigger electrode is by a filter capacitor ground connection.
8, ground-fault interrupter as claimed in claim 5 is characterized in that, the output of described monostable flipflop is by a light-emitting diode ground connection.
9, ground-fault interrupter as claimed in claim 1 is characterized in that, first end of the tripping coil of described release is connected with live wire, and second end is connected with the Enable Pin of described leakage protection circuit by behind the rectifier bridge.
10, ground-fault interrupter as claimed in claim 2 is characterized in that, described failure alarm circuit comprises a resistance and a light-emitting diode, is parallel to the tripping coil two ends of described release after described resistance and the series connection of described light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200942953U CN201219092Y (en) | 2008-06-02 | 2008-06-02 | Ground fault interrupter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200942953U CN201219092Y (en) | 2008-06-02 | 2008-06-02 | Ground fault interrupter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201219092Y true CN201219092Y (en) | 2009-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200942953U Expired - Fee Related CN201219092Y (en) | 2008-06-02 | 2008-06-02 | Ground fault interrupter |
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| CN (1) | CN201219092Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104465257A (en) * | 2013-09-23 | 2015-03-25 | 国家电网公司 | Leakage protecting circuit breaker |
| CN105092945A (en) * | 2015-07-21 | 2015-11-25 | 国家电网公司 | Zero-line overcurrent alarm device for power distribution network |
| CN108631263A (en) * | 2017-03-21 | 2018-10-09 | 上海复旦微电子集团股份有限公司 | Ground-fault protection system |
| CN108879596A (en) * | 2017-05-09 | 2018-11-23 | 上海复旦微电子集团股份有限公司 | A kind of leakage protection circuit with power supply monitoring function |
| CN109755921A (en) * | 2017-11-08 | 2019-05-14 | 苏州益而益电器制造有限公司 | Ground-fault interrupter |
| CN104810784B (en) * | 2014-01-28 | 2019-06-07 | 西门子公司 | Electrical protective device for electrically installing is with and related methods |
| US10923899B2 (en) | 2017-03-21 | 2021-02-16 | Shanghai Fudan Microelectronics Group Company Limited | Ground fault protection system |
| CN112436483A (en) * | 2020-11-06 | 2021-03-02 | 江西百盈高新技术股份有限公司 | Leakage protection circuit |
| CN113608158A (en) * | 2021-08-19 | 2021-11-05 | 国网天津市电力公司 | Auxiliary tool for checking and accepting insulation monitoring device based on leakage current principle |
| CN113865107A (en) * | 2020-06-30 | 2021-12-31 | 芜湖美的厨卫电器制造有限公司 | Power consumption environment detection device and water heater |
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2008
- 2008-06-02 CN CNU2008200942953U patent/CN201219092Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104465257A (en) * | 2013-09-23 | 2015-03-25 | 国家电网公司 | Leakage protecting circuit breaker |
| CN104465257B (en) * | 2013-09-23 | 2017-05-10 | 国家电网公司 | Leakage protecting circuit breaker |
| CN104810784B (en) * | 2014-01-28 | 2019-06-07 | 西门子公司 | Electrical protective device for electrically installing is with and related methods |
| CN105092945A (en) * | 2015-07-21 | 2015-11-25 | 国家电网公司 | Zero-line overcurrent alarm device for power distribution network |
| CN108631263A (en) * | 2017-03-21 | 2018-10-09 | 上海复旦微电子集团股份有限公司 | Ground-fault protection system |
| US10923899B2 (en) | 2017-03-21 | 2021-02-16 | Shanghai Fudan Microelectronics Group Company Limited | Ground fault protection system |
| CN108879596A (en) * | 2017-05-09 | 2018-11-23 | 上海复旦微电子集团股份有限公司 | A kind of leakage protection circuit with power supply monitoring function |
| CN108879596B (en) * | 2017-05-09 | 2019-11-05 | 上海复旦微电子集团股份有限公司 | A kind of leakage protection circuit with power supply monitoring function |
| CN109755921A (en) * | 2017-11-08 | 2019-05-14 | 苏州益而益电器制造有限公司 | Ground-fault interrupter |
| CN113865107A (en) * | 2020-06-30 | 2021-12-31 | 芜湖美的厨卫电器制造有限公司 | Power consumption environment detection device and water heater |
| CN112436483A (en) * | 2020-11-06 | 2021-03-02 | 江西百盈高新技术股份有限公司 | Leakage protection circuit |
| CN113608158A (en) * | 2021-08-19 | 2021-11-05 | 国网天津市电力公司 | Auxiliary tool for checking and accepting insulation monitoring device based on leakage current principle |
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Granted publication date: 20090408 Termination date: 20160602 |