CN202633938U - Residual current protection device for wiring abnormity - Google Patents
Residual current protection device for wiring abnormity Download PDFInfo
- Publication number
- CN202633938U CN202633938U CN 201220171071 CN201220171071U CN202633938U CN 202633938 U CN202633938 U CN 202633938U CN 201220171071 CN201220171071 CN 201220171071 CN 201220171071 U CN201220171071 U CN 201220171071U CN 202633938 U CN202633938 U CN 202633938U
- Authority
- CN
- China
- Prior art keywords
- conductor
- signal
- circuit
- voltage difference
- signal processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a residual current protection device for wiring abnormity. The residual current protection device for wiring abnormity comprises a phase line conductor, a zero line conductor, a ground wire conductor, a switching device, a residual current detection circuit, a voltage difference detection circuit, a first signal processing circuit, a second signal processing circuit and an actuating device. The residual current detection circuit detects the residual currents of the phase line conductor and the zero line conductor. The voltage difference detection circuit detects the voltage difference between the ground wire conductor and the zero line conductor. The fist signal processing circuit carries out predetermined processing on the output signals of the voltage difference detection circuit. The second signal processing circuit responds to one of predetermined error conditions of the output signals of the residual current detection circuit and the output signals of the first signal processing circuit and generates drive signals. The actuating device responds to the drive signals and drives the switching device to be in a second position, so as to cut off the electric connection at an input side and an output side. No human participation is needed to realize the above functions, and the residual current protection device for wiring abnormity has the function of automatically completing the detection action, and can satisfy the online withstand voltage test requirement of an electric appliance manufacturer.
Description
Technical field
The utility model relates to Electrical Safety protection field, relates in particular to the unusual Aftercurrent protecting equipment of wiring.
Background technology
Because terminal block is lack of standardization; Might there be false wiring in the supply socket of household electrical appliance; Link to each other with phase line for example with the phase line and the zero line improved cross connect of socket, or with ground wire, perhaps electrical appliance ageing of insulation in long-term the use; The ground wire electrification that causes power supply, these all cause the generation of electric shock accidents easily.
Whether existing Aftercurrent protecting equipment be detects the situation of ground wire electrification, be employed in usually to wear detection ring in the ground wire and detect and have electric current to flow through in the ground wire, and the drawback of this method is to have electric current to flow through in must ground wire and when reaching set point, install and just play protection.Also have through electronic component cross-over connections such as little resistance resistance, electric capacity or transformers between zero line and ground wire or phase line and ground wire; Judge through the sampling voltage difference; These traditional detection method have requirement to magnitude of pressure differential; Promptly, pressure reduction just can move after reaching certain value, and this pressure reduction hazardous, this has just formed potential safety hazard; Moreover these methods can not satisfy the requirement of online voltage-withstand test; In addition, above method move at protective device, in the electrical appliance plug plug process or mains switch can have misoperation when closing a floodgate maybe.
Therefore need a kind of unusual Aftercurrent protecting equipment of wiring of novelty,, can both detect the false wiring situation of using supply socket, cut off the power supply of electrical appliance and can prevent in use to occur misoperation no matter which kind of state this device is in.
The utility model content
Whether charged a main purpose of the utility model is, overcomes above-mentioned defective of the prior art, provide a kind of and can detect whether improved cross connect or ground wire the unusual Aftercurrent protecting equipment of wiring of zero live wire.
In one embodiment, provide a kind of wiring unusual Aftercurrent protecting equipment, it comprises:
Phase conductor, zero line conductor, gnd conductor;
Switching device makes said phase conductor, zero line conductor, gnd conductor be in conducting state when being configured to be in primary importance, and makes said phase conductor, zero line conductor, gnd conductor be in off state when being in the second place;
The residual current testing circuit is configured to detect the residual current of said phase conductor and zero line conductor;
Voltage difference detection circuits is configured to detect the voltage difference between said gnd conductor and the zero line conductor through the divider resistance dividing potential drop;
First signal processing circuit is coupled to said voltage difference detection circuits, is configured to the processing that the output signal of said voltage difference detection circuits is scheduled to;
The secondary signal treatment circuit; Be coupled to said residual current testing circuit and said first signal processing circuit, be configured to one of predetermined error conditions and produce drive signal in response to the output signal of the output signal of said residual current testing circuit and said first signal processing circuit;
Exciting bank is coupled to said secondary signal treatment circuit, is configured to order about said switching device in response to said drive signal and is in the said second place.
In an embodiment of the unusual Aftercurrent protecting equipment of wiring, comprise comparator circuit in said first signal processing circuit, when being used for output signal in said voltage difference detection circuits greater than predetermined threshold, the output prearranged signal.
In an embodiment of the unusual Aftercurrent protecting equipment of wiring, said voltage difference detection circuits also comprises at least one diode, and said diode is used to extract unidirectional half-wave voltage signal.
In an embodiment of the unusual Aftercurrent protecting equipment of wiring; Said voltage difference detection circuits also comprises filtering and voltage stabilizing circuit; Said filtering and voltage stabilizing circuit are used for filtering and the voltage stabilizing signal through the divider resistance dividing potential drop, so that the output signal of said voltage difference detection circuits is safe for said first signal processing circuit.
In an embodiment of the unusual Aftercurrent protecting equipment of wiring, said secondary signal treatment circuit comprises thyristor.
In an embodiment of the unusual Aftercurrent protecting equipment of wiring, the output of said first signal processing circuit is directly coupled to the control utmost point of said thyristor.
In an embodiment of the unusual Aftercurrent protecting equipment of wiring, the unusual Aftercurrent protecting equipment of said wiring has first power supply and second source is respectively said first signal processing circuit and the power supply of said secondary signal treatment circuit.
In an embodiment of the unusual Aftercurrent protecting equipment of wiring; Said residual current testing circuit comprises a current transformer; Said phase conductor and zero line conductor are first elementary as this current transformer, and this current transformer secondary is coupled to said secondary signal treatment circuit.
The unusual Aftercurrent protecting equipment of the wiring that the utility model provided has the following advantages: circuit structure is simple; Do not influencing on the basis that original phase line, the zero line dielectric voltage withstand to ground wire requires; Increased the arbitration functions of the false wiring of the supply socket that electrical appliance is used; Particularly can be between zero line and ground wire pressure reduction when low; Still can judge dangerous wiring state when for example being low to moderate the safe voltage of 36V preferably when the ground wire electrification of supply socket; And break off being electrically connected of electrical appliance and supply socket in the case, protection electrical appliance user's personal safety, and can avoid moving at protective device, in the electrical appliance plug plug process or mains switch can have misoperation when closing a floodgate maybe.And above-mentioned detection holding function all can be accomplished automatically, can satisfy electrical appliance manufacturer's online voltage-withstand test requirement simultaneously again.
Description of drawings
Through with reference to the detailed description of being done below the advantages to non-limiting example, it is more obvious that the other features, objects and advantages of the utility model will become:
Fig. 1 shows the circuit diagram according to the unusual Aftercurrent protecting equipment 100 of wiring of an embodiment of the utility model;
Fig. 2 shows the circuit diagram according to the unusual Aftercurrent protecting equipment 200 of wiring of an embodiment of the utility model; And
Fig. 3 shows the circuit diagram according to the unusual Aftercurrent protecting equipment 300 of wiring of an embodiment of the utility model.
In the drawings, run through different diagrammatic sketch, identical or similar Reference numeral is represented same or analogous device (module).
Embodiment
Fig. 1 shows the circuit diagram according to the unusual Aftercurrent protecting equipment 100 of wiring of an embodiment of the utility model.As shown in the figure, the unusual Aftercurrent protecting equipment 100 of wiring comprises: phase conductor 110, zero line conductor 120, gnd conductor 130, switching device 140, residual current testing circuit 150, voltage difference detection circuits 160, first signal processing circuit 170, secondary signal treatment circuit 180 and exciting bank 190.
Residual current testing circuit 150 is configured to detect the residual current of phase conductor 110 and zero line conductor 120.Particularly; Residual current testing circuit 150 comprises an electric current mutual inductance 151; Phase conductor 110 and zero line conductor 120 form the first elementary of current transformers 151; Secondary induction by current transformer 151 generates the residual current detection signal, and this signal is coupled to secondary signal treatment circuit 180.
Voltage difference detection circuits 160 is configured to detect the voltage difference between gnd conductor 130 and the zero line conductor 120.Particularly, in this embodiment, voltage difference detection circuits 160 comprises: diode D2, divider resistance R8 and R10, resistance R 9, capacitor C 9 and voltage-stabiliser tube ZD.In this embodiment, diode D2 is set to extract unidirectional half-wave voltage signal; The signal that then detects detects voltage difference through the above high resistance measurement R10 of megaohm, and after R10, connects a less relatively resistance R 8, obtains the small voltage signal thereby can take a sample, and is convenient to subsequent treatment.For example, said high resistance measurement R8 and R10 select 500k Ω and 5M Ω respectively.The then filter circuit filtering through being made up of R9 and C9 again obtains to disturb less voltage difference sampled signal; The voltage differential signal of process filtering is again via being coupled to first signal processing circuit 170 after the voltage-stabiliser tube ZD voltage stabilizing then.Voltage-stabiliser tube ZD is used to limit the voltage difference sampled signal through filtering, to avoid under abnormal conditions, because the voltage difference sampled signal is excessive voltage difference detection circuits is caused damage.
First signal processing circuit 170 comprises that chip IC 2, reference voltage provide circuit and output signal processing circuit.Chip IC 2 can be a comparator exclusive disjunction amplifier.In the embodiment shown in fig. 1, be that comparator is that example describes with chip IC 2.Reference voltage provides circuit to comprise R11, R12 and C10.Output signal processing circuit comprises R13, R14 and C11.
When operation; Be coupled to the input of first signal processing circuit, 170 chips IC2 by the signal of voltage difference detection circuits 160 outputs; Next in chip IC 2; The signal of voltage difference detection circuits 160 output is compared with the reference voltage that is provided by the reference voltage circuit, and when the signal of voltage difference detection circuits 160 outputs during greater than reference voltage, signal is exported in chip IC 2 outputs first.The first output signal for example is the positive level signal.The first output signal is being coupled to secondary signal treatment circuit 180 through diode D5 after output signal processing circuit is handled.
Secondary signal treatment circuit 180; Be coupled to said residual current testing circuit 150 and said first signal processing circuit 170, be configured to one of predetermined error conditions and produce drive signal in response to the output signal of the output signal of said residual current testing circuit 150 and said first signal processing circuit 170.
Particularly, secondary signal treatment circuit 180 comprises control chip IC1 and thyristor Q1 etc.The predetermined error conditions of the output signal of residual current testing circuit is to surpass a predetermined value, and the predetermined error conditions of voltage difference detection signal is to surpass another predetermined value; The safety standard that these two predetermined values are followed according to the unusual Aftercurrent protecting equipment 100 of wiring and the detection sensitivity of corresponding device are confirmed.
In the embodiment shown in fig. 1, the output signal of first signal processing circuit 170 is directly coupled to the control utmost point of thyristor Q1.When the output signal of first signal processing circuit 170 is positive level, the thyristor Q1 conducting that is triggered.
The secondary control chip IC1 that is coupled to of current transformer 151.When the output signal of residual current testing circuit reached its predetermined error conditions, positive level signal of control chip IC1 output was to the control utmost point of thyristor Q1, the thyristor Q1 thereby the conducting that is triggered.
When thyristor Q1 conducting, will flow through big electric current, thereby cause and correspondingly flow through big electric current on the solenoid SOL, this big current signal is drive signal.
Exciting bank 190 is coupled to secondary signal treatment circuit 180, is configured to order about said switching device 140 in response to said drive signal and is in the said second place.
Particularly, exciting bank 190 comprises solenoid SOL.Solenoid SOL two ends are connected respectively to phase conductor 110 and diode D1, are that first signal processing circuit 170 and secondary signal treatment circuit 180 provide power supply by the halfwave rectifier signal through rectifier diode D1.
Coupling between exciting bank 190 and the switching device 140 can adopt the machine driving coupling usually.Also comprise the armature that can move along the radial in the electromagnet that solenoid SOL twined.Three switches, 141,142,143 the return pins of switching device 140 via SR, basically with the radially vertical elements such as snap close of return pin, be coupled to armature through machine driving.When switching device 140 was in primary importance, three switches all were in closure state, the circuit operate as normal.When secondary signal treatment circuit 180 produces drive signal because of circuit abnormality; Thereby in solenoid SOL, flow through big electric current, thereby cause that armature moves pulling or bump snap close, thereby snap close breaks away from and the engagement of return pin discharges return pin; Return pin drives related elements makes switch 141,142,143 break off; Thereby switching device 140 is in the second place, and being electrically connected between Wiring protection device 100 input sides and the outlet side is able to cut off, and electrical safety is able to guarantee.
When from input side incoming transport power supply, when switching device 140 was in primary importance and circuit operate as normal simultaneously, light-emitting diode D6 energising was shinny, with the indication normal operating conditions.The branch road two ends difference cross-over connection that comprises resistance R 5 and switch 102 is in the phase conductor and the zero line conductor of current transformer 151 both sides.When close switch 102; On as the elementary phase conductor of current transformer 151 and zero line conductor, produce residual current; Thereby cause that secondary signal treatment circuit 180 produces drive signal; Exciting bank 190 makes switching device 140 return to the second place in response to this, cuts off the electrical connection between input side and the outlet side.
When ground wire conductor 130 links to each other with live wire conductor 110, just there is potential difference between gnd conductor 130 and the zero line conductor 120; Perhaps when live wire conductor 110 and zero line conductor 120 improved cross connects, because equipotential between gnd conductor 130 and the zero-power line conductor 120 will produce potential difference between the zero line conductor 120 of this moment gnd conductor 130 and false wiring.Voltage difference detection circuits 160 is through the detection to the voltage between zero line conductor and gnd conductor; With exporting to first signal processing circuit 170 after voltage differential signal sampling filter and the voltage stabilizing; Compare with the reference voltage signal in the chip IC 2 in first signal processing circuit 170; When surpassing set point; Output high level drive signal to secondary signal treatment circuit 180 also causes that thus secondary signal treatment circuit 180 produces drive signal, and exciting bank 190 makes switching device 140 return to the second place in response to this drive signal, cuts off the electrical connection between input side and the outlet side.
Fig. 2 shows the circuit diagram according to the unusual Aftercurrent protecting equipment 200 of wiring of an embodiment of the utility model.As shown in the figure, the unusual Aftercurrent protecting equipment 200 of wiring comprises: phase conductor 210, zero line conductor 220, gnd conductor 230, switching device 240, residual current testing circuit 250, voltage difference detection circuits 260, first signal processing circuit 270, secondary signal treatment circuit 280 and exciting bank 290.
The circuit setting of the unusual Aftercurrent protecting equipment 200 of wiring is similar to the unusual Aftercurrent protecting equipment 100 of wiring; The main distinction has two places; One of which is first power supply that the chip IC 2 in first signal processing circuit 270 does not adopt the chip IC 1 in the secondary signal treatment circuit 280 to be adopted; But adopt the second source of additional designs to supply power; This independently power supply form by resistance R 15, capacitor C 12 and voltage-stabiliser tube ZD, such design can make the chip IC 2 in the signal processing circuit 270 of winning more stably work; Another place's difference is that voltage difference detection circuits 260 changes to some extent; Voltage difference detection circuits 160 in first embodiment 100, in the voltage difference detection circuits 260 of present embodiment 200, the voltage differential signal between zero line conductor 220 and the gnd conductor 230 carries out dividing potential drop through high resistance measurement R10 and R8 earlier; Then get half-wave voltage signal through diode D2; And then through R9, C9 and R7 filtering, wherein alternatively, R7 also can be replaced by voltage-stabiliser tube.
In this embodiment, when from input side incoming transport power supply, when switching device 240 was in primary importance and circuit operate as normal simultaneously, light-emitting diode D6 energising was shinny, with the indication normal operating conditions.The branch road two ends difference cross-over connection that comprises resistance R 5 and switch 202 is in the phase conductor and the zero line conductor of current transformer 251 both sides.When close switch 202; On as the elementary phase conductor of current transformer 251 and zero line conductor, produce residual current; Thereby cause that secondary signal treatment circuit 280 produces drive signal; Exciting bank 290 makes switching device 240 return to the second place in response to this, cuts off the electrical connection between input side and the outlet side.
When ground wire conductor 230 links to each other with live wire conductor 210, just there is potential difference between gnd conductor 230 and the zero line conductor 220; Perhaps when live wire conductor 210 and zero line conductor 220 improved cross connects, because equipotential between gnd conductor 230 and the zero-power line conductor 220 will produce potential difference between the zero line conductor 220 of this moment gnd conductor 230 and false wiring.Voltage difference detection circuits 260 is through the detection to the voltage between zero line conductor and gnd conductor; With exporting to first signal processing circuit 270 after voltage differential signal sampling filter and the voltage stabilizing; Compare with the reference voltage signal in the chip IC 2 in first signal processing circuit 270; When surpassing set point, output high level drive signal to secondary signal treatment circuit 280 also causes that thus secondary signal treatment circuit 280 produces drive signal, and exciting bank 290 makes switching device 240 return to the second place in response to this drive signal; Cut off the electrical connection between input side and the outlet side, electrical safety is able to guarantee.
Fig. 3 shows the circuit diagram according to the unusual Aftercurrent protecting equipment 300 of wiring of an embodiment of the utility model.As shown in the figure, the unusual Aftercurrent protecting equipment 300 of wiring comprises: phase conductor 310, zero line conductor 320, gnd conductor 330, switching device 340, residual current testing circuit 350, voltage difference detection circuits 360, first signal processing circuit 370, secondary signal treatment circuit 380 and exciting bank 390.
The circuit setting of the unusual Aftercurrent protecting equipment 300 of wiring is similar to the unusual Aftercurrent protecting equipment 100 of wiring; The main distinction is; Signal by 370 outputs of first signal processing circuit is not the thyristor Q1 in the direct driving secondary signal treatment circuit 380; But this is connected to the chip IC 1 in the secondary signal treatment circuit 380, the signal of handling back output through IC1 is used to drive thyristor Q1.
In this embodiment, when from input side incoming transport power supply, when switching device 340 was in primary importance and circuit operate as normal simultaneously, light-emitting diode D1 energising was shinny, with the indication normal operating conditions.When ground wire conductor 330 links to each other with live wire conductor 310, just there is potential difference between gnd conductor 330 and the zero line conductor 320; Perhaps when live wire conductor 310 and zero line conductor 320 improved cross connects, because equipotential between gnd conductor 330 and the zero-power line conductor 320 will produce potential difference between the zero line conductor 320 of this moment gnd conductor 330 and false wiring.Voltage difference detection circuits 360 is through the detection to the voltage between zero line conductor and gnd conductor; With exporting to first signal processing circuit 370 after voltage differential signal sampling filter and the voltage stabilizing; Compare with the reference voltage signal in the chip IC 2 in first signal processing circuit 370; When surpassing set point; An input of the chip IC 1 in output high level drive signal to the secondary signal treatment circuit 380, when the signal of this input of input during greater than threshold level, an output of chip IC 1 is exported second control signal (for example high level signal).Second control signal directly drives thyristor Q1; And cause that thus secondary signal treatment circuit 380 produces drive signal; Exciting bank 390 makes switching device 340 return to the second place in response to this drive signal; Cut off the electrical connection between input side and the outlet side, electrical safety is able to guarantee.
Those skilled in the art will be understood that the foregoing description all is exemplary and nonrestrictive.The different technologies characteristic that in different embodiment, occurs can make up, to obtain beneficial effect.Those skilled in the art will be understood that and realize the embodiment of other variations of the embodiment that disclosed on the basis of research accompanying drawing, specification and claims.In claims, term " comprises " does not get rid of other devices or step; Indefinite article " one " is not got rid of a plurality of; Term " first ", " second " are used to indicate title but not are used to represent any specific order.Any Reference numeral in the claim all should not be understood that the restriction to protection range.Some technical characterictic appears in the different dependent claims and does not mean that and can not these technical characterictics be made up to obtain beneficial effect.This patent covers literal all methods, device and the product of going up or fall in doctrine of equivalents the scope of accompanying claims.
Claims (8)
1. the unusual Aftercurrent protecting equipment of wiring is characterized in that, comprising:
Phase conductor (110), zero line conductor (120), gnd conductor (130);
Switching device (140) makes said phase conductor, zero line conductor, gnd conductor be in conducting state when being configured to be in primary importance, and makes said phase conductor, zero line conductor, gnd conductor be in off state when being in the second place;
Residual current testing circuit (150) is configured to detect the residual current of said phase conductor and zero line conductor;
Voltage difference detection circuits (160) is configured to detect the voltage difference between said gnd conductor and the zero line conductor through the divider resistance dividing potential drop;
First signal processing circuit (170) is coupled to said voltage difference detection circuits, is configured to the processing that the output signal of said voltage difference detection circuits is scheduled to;
Secondary signal treatment circuit (180); Be coupled to said residual current testing circuit and said first signal processing circuit, be configured to one of predetermined error conditions and produce drive signal in response to the output signal of the output signal of said residual current testing circuit and said first signal processing circuit;
Exciting bank (190) is coupled to said secondary signal treatment circuit, is configured to order about said switching device in response to said drive signal and is in the said second place.
2. the unusual Aftercurrent protecting equipment of wiring according to claim 1 is characterized in that, comprises comparator circuit in said first signal processing circuit, when being used for output signal in said voltage difference detection circuits greater than predetermined threshold, and the output prearranged signal.
3. the unusual Aftercurrent protecting equipment of wiring according to claim 1 is characterized in that said voltage difference detection circuits also comprises at least one diode, and said diode is used to extract unidirectional half-wave voltage signal.
4. the unusual Aftercurrent protecting equipment of wiring according to claim 1; It is characterized in that; Said voltage difference detection circuits also comprises filtering and voltage stabilizing circuit; Said filtering and voltage stabilizing circuit are used for filtering and the voltage stabilizing signal through the divider resistance dividing potential drop, so that the output signal of said voltage difference detection circuits is safe for said first signal processing circuit.
5. the unusual Aftercurrent protecting equipment of wiring according to claim 1 is characterized in that said secondary signal treatment circuit comprises thyristor.
6. the unusual Aftercurrent protecting equipment of wiring according to claim 5 is characterized in that the output of said first signal processing circuit is directly coupled to the control utmost point of said thyristor.
7. the unusual Aftercurrent protecting equipment of wiring according to claim 1; It is characterized in that the unusual Aftercurrent protecting equipment of said wiring has first power supply and second source is respectively said first signal processing circuit and the power supply of said secondary signal treatment circuit.
8. the unusual Aftercurrent protecting equipment of wiring according to claim 1; It is characterized in that; Said residual current testing circuit comprises a current transformer; Said phase conductor and zero line conductor are first elementary as this current transformer, and this current transformer secondary is coupled to said secondary signal treatment circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220171071 CN202633938U (en) | 2012-04-20 | 2012-04-20 | Residual current protection device for wiring abnormity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220171071 CN202633938U (en) | 2012-04-20 | 2012-04-20 | Residual current protection device for wiring abnormity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202633938U true CN202633938U (en) | 2012-12-26 |
Family
ID=47387084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220171071 Withdrawn - After Issue CN202633938U (en) | 2012-04-20 | 2012-04-20 | Residual current protection device for wiring abnormity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202633938U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378592A (en) * | 2012-04-20 | 2013-10-30 | 苏州益而益电器制造有限公司 | Abnormal-wiring surplus current protection device |
-
2012
- 2012-04-20 CN CN 201220171071 patent/CN202633938U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378592A (en) * | 2012-04-20 | 2013-10-30 | 苏州益而益电器制造有限公司 | Abnormal-wiring surplus current protection device |
| CN103378592B (en) * | 2012-04-20 | 2016-10-05 | 苏州益而益电器制造有限公司 | The abnormal Aftercurrent protecting equipment of wiring |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100391072C (en) | Apparatus for monitoring neutral wire and earth wire, and electric switch device containing the same | |
| CN103890957A (en) | Safety device for a photovoltaic system | |
| CN106024520A (en) | Electronic arc extinguishing device | |
| CN202167827U (en) | Safe quick-break type leakage protector | |
| CN204243728U (en) | Transformer overload protection warning device | |
| CN105281290A (en) | Residual-current-operated protective arrangement, charging apparatus and method for checking residual-current-operated protective device | |
| CN202268696U (en) | Electric wiring protection device for detecting power supply false wiring condition | |
| CN105304411B (en) | Relay monitoring | |
| CN104377647A (en) | Electric leakage protection circuit | |
| CN104901090B (en) | A kind of conversion voltage-type leakage protecting plug | |
| CN104332948A (en) | Arc fault protection device | |
| CN203800556U (en) | Microcomputer protection device exit relay drive circuit | |
| CN202633938U (en) | Residual current protection device for wiring abnormity | |
| CN103592511B (en) | A kind of circuit detecting ac power frequency | |
| CN201199630Y (en) | Leakage protector with zero-off protection | |
| CN103001174B (en) | Detect the electric Wiring protection device of power supply false wiring condition | |
| CN102655323A (en) | Automatic identification and conversion circuit for alternating current zero and live wires | |
| CN102364762B (en) | Leakage protection plug | |
| CN101944716B (en) | Electricity leakage detection protective circuit | |
| CN204696376U (en) | A kind of changing voltage type leakage protecting plug | |
| CN203942269U (en) | A kind of New Arc failure to trip device | |
| CN108693467A (en) | Switching device for checking switch element | |
| CN103378592A (en) | Abnormal-wiring surplus current protection device | |
| CN203275565U (en) | Multifunctional grounding detector | |
| CN208337139U (en) | Residual voltage control circuit and household appliance with same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121226 Effective date of abandoning: 20161005 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |