CN102340124A - Electrical wiring protection device - Google Patents
Electrical wiring protection device Download PDFInfo
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- CN102340124A CN102340124A CN2010102372053A CN201010237205A CN102340124A CN 102340124 A CN102340124 A CN 102340124A CN 2010102372053 A CN2010102372053 A CN 2010102372053A CN 201010237205 A CN201010237205 A CN 201010237205A CN 102340124 A CN102340124 A CN 102340124A
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- Prior art keywords
- line path
- switch
- protection device
- phase line
- zero line
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- Emergency Protection Circuit Devices (AREA)
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- General Physics & Mathematics (AREA)
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Abstract
The invention provides an electrical wiring protection device, which has a self-checking function on a power line state. The device comprises: a phase line pathway (10); a zero line pathway (20); an error detection circuit (40), which is coupled to the phase line pathway and the zero line pathway and is configured to at least respond to the phase line pathway and the zero line pathway so as to generate an error detection signal; a signal drive circuit (50), which is coupled to the error detection circuit and is configured to response the error detection signal so as to generate a driving signal; electrical shielding conductors (19, 29), which are arranged at output sides of the phase line pathway and the zero line pathway and are coupled to the phase line pathway or the zero line pathway through the error detection circuit and/or the signal drive circuit; and a releasing assembly (60), which is coupled to the signal drive circuit and is configured to break connection between the phase line pathway and the zero line pathway when the driving signal exceeds a predetermined value.
Description
Technical field
The present invention relates to Electrical Safety protection field, relate in particular to the electric Wiring protection device of the breaking characteristics that have between input and the output.
Background technology
For the leakage current of avoiding household electrical appliance damages the user; Usually at household electrical appliance, such as electric heater, refrigerator etc., the power supply input side the electric Wiring protection device with leakage current defencive function is installed; Or title ground-fault interrupter, for example leakage protecting plug.
Existing leakage protecting plug in long-term use, thereby power line lose the insulating properties that causes between each bar line easily and be destroyed, thereby stayed potential safety hazard.
Need a kind of electric Wiring protection device of novelty for this reason, can accomplish the ground fault open circuit function, can the state of power line be detected again.
Summary of the invention
A main purpose of the present invention is, overcomes above-mentioned defective of the prior art, and a kind of electric Wiring protection device with power line status detection function is provided, and does not influence normal Earth Fault Detection function.
In one embodiment of the invention, a kind of electric Wiring protection device is provided, has comprised: phase line path, zero line path; Error detect circuit is coupled to said phase line path and zero line path, is configured to produce the wrong detection signal in response to the mistake of said phase line path and zero line path at least; Signal drive circuit is coupled to said error detect circuit, is configured to produce drive signal in response to said wrong detection signal; The electric screen conductor is arranged at the outlet side of said phase line path and zero line path, and this electric screen conductor dbus crosses said error detect circuit and/or signal drive circuit is coupled to said phase line path or zero line path; Trip assembley therefor is coupled to said signal drive circuit, is configured to the connection of when said drive signal surpasses predetermined value, breaking off said phase line path, zero line path.Usually, the electric screen conductor is covered on the phase line and zero line of electric Wiring protection device outlet side, and the insulating properties between each bar line of outlet side is destroyed, and will on the electric screen conductor, produce leakage current, thereby can realize the status detection function of power line.
In one embodiment of the invention; Error detect circuit in the electricity Wiring protection device comprises a current transformer that has a secondary winding; Said phase line path and zero line path comprise an elementary winding of said current transformer, and said current transformer is configured to produce the wrong detection signal in response to the pumping signal of elementary winding at said secondary winding.
In one embodiment of the invention, comprise a rectifier bridge in the electric Wiring protection device, this rectifier bridge is connected respectively to said phase line path and the zero line path input side with respect to said current transformer; Said electric screen conductor dbus is crossed a resistive branch road and is connected to this rectifier bridge logically.When having leakage current to flow through on the electric screen conductor, on phase line path and zero line path, produce unsymmetrical current through resistive branch road, rectifier bridge, thereby can produce the wrong detection signal at error detect circuit.Under the normal situation of electric Wiring protection device, in the use, do not have electric current to flow through in electric screen conductor and the resistive branch road, thereby reduced power consumption, practiced thrift the energy.
In one embodiment of the invention, be connected in the electric Wiring protection device electric screen conductor and said rectifier bridge logically between resistive branch road comprise another elementary winding of said current transformer.This elementary winding can be around multiturn, to improve the sensitivity of power line detection of electrical leakage.
In one embodiment of the invention, the phase line path in the electric Wiring protection device comprises first switch, and the zero line path comprises second switch; Trip assembley therefor is configured to when said drive signal surpasses predetermined value, break off said first switch and second switch, thus the connection of breaking off phase line path, zero line path.
In one embodiment of the invention, also comprise the ground wire path in the electric Wiring protection device, this ground wire path comprises the 3rd switch; Said error detect circuit is configured to also produce the wrong detection signal in response to the mistake of said ground wire path; Said trip assembley therefor is configured to when said drive signal surpasses predetermined value, also break off said the 3rd switch, thus the connection of breaking off the ground wire path.
In one embodiment of the invention, the two ends of the 3rd switch described in electric Wiring protection device parallel connections one state indicator elment.
In one embodiment of the invention, signal drive circuit comprises silicon-controlled device described in the electric Wiring protection device, and the control utmost point of this silicon-controlled device is coupled to said error detect circuit, is configured to the conducting in response to the triggering of said wrong detection signal.
In one embodiment of the invention, also comprise temperature detect switch (TDS) in the electric Wiring protection device, an end of this temperature detect switch (TDS) is coupled to the control utmost point of silicon-controlled device, the other end is introduced bias voltage; When temperature surpassed predetermined threshold, said temperature detect switch (TDS) was closed, thereby triggers said silicon-controlled device conducting, thereby produces said drive signal.
In one embodiment of the invention, the temperature detect switch (TDS) in the electric Wiring protection device comprises bimetal release.
Advantage of the present invention comprises: the circuit structure of electric Wiring protection device is simple; The status detection function of outlet side power line also is provided when having guaranteed the ground fault open circuit function, can have connected at the electric power that cuts off under the situation that the outlet side power line is lost between input side, the outlet side.Under the normal situation of electric Wiring protection device, in the use, do not have electric current to flow through in the electric screen conductor, thereby reduced power consumption, practiced thrift the energy.
Description of drawings
Through reading the detailed description of doing with reference to following accompanying drawing that non-limiting example is done, other features, objects and advantages of the present invention will become more apparent:
Fig. 1 shows the circuit diagram of electric Wiring protection device according to an embodiment of the invention;
Fig. 2 shows the circuit diagram of electric Wiring protection device according to still another embodiment of the invention;
Fig. 3 shows the circuit diagram of electric Wiring protection device according to another embodiment of the invention;
In the drawings, run through different diagrammatic sketch, identical or similar Reference numeral is represented characteristic of correspondence.
Embodiment
Fig. 1 shows the circuit diagram of electric Wiring protection device according to an embodiment of the invention.As shown in the figure, the electric Wiring protection device among this embodiment comprises: phase line path 10, zero line path 20, error detect circuit 40, signal drive circuit 50, trip assembley therefor 60, electric screen conductor 19,29.
Particularly, error detect circuit 40 comprises current transformer 49.Current transformer 49 comprises a secondary winding 48.Phase line path 10 and zero line path 20 comprise an elementary winding 41 of current transformer 49.Current transformer 49 is configured to produce the wrong detection signal in response to the pumping signal of elementary winding at secondary winding 48.Those skilled in the art will be understood that in the error detect circuit 40 can also comprise operational amplification circuit, is used for the signal of secondary winding 48 is amplified, to produce the wrong detection signal.
Particularly, signal drive circuit 50 comprises full-wave rectification bridge B1, thyristor Q1.The AC power rectification of full-wave rectification bridge B1 to introducing with respect to the input side of current transformer 49 from phase line path 10 and zero line path 20 forms logically between diode D3 and D4, from output DC between diode D1 and the D2.The negative electrode of thyristor Q1 is connected to logically, and anode inserts the direct voltage biasing, and the control utmost point is connected to secondary winding 48.When wrong detection signal triggering thyristor Q1 conducting, all can flow through big current signal at thyristor Q1 and rectifier bridge B 1, that is drive signal.Light-emitting diode 76 can index signal drive circuit 50 operating state, when rectifier bridge B1 had direct current output, light-emitting diode 76 lighted; When rectifier bridge B1 did not have direct current output, light-emitting diode 76 extinguished.
Error detect circuit 40 and signal drive circuit 50 shared identical logically.
Trip assembley therefor 60 is coupled to signal drive circuit 50, is configured to when said drive signal surpasses predetermined value, break off the connection of phase line path 10, zero line path 20.
Particularly, trip assembley therefor 60 comprises: solenoid 69 and iron core wherein.
Particularly, electric screen conductor 19,29 is connected to error detect circuit 40 through a resistive branch road and signal drive circuit 50 is logically common.This resistive branch road comprises resistance R 7.
The electricity Wiring protection device can be in trip status (or claiming off state) and reset mode (or claiming channel status).Under trip status, first switch 13 all breaks off with second switch 23.When pressing SR, through transmission, return pin and latch engagement of the miscellaneous parts such as return pin that are connected with SR.Remove the compressing to SR, return pin will drive the snap close counter motion, thereby make the switch 13 of winning, second switch 23 closures, and electric Wiring protection device gets into reset mode (channel status).When silicon-controlled device Q1 receives the wrong detection signal triggering and conducting can be flow through big current signal in the solenoid 69, that is drive signal; When drive signal surpassed predetermined value, the iron core in the solenoid 69 produced action percussion snap close, and return pin and snap close are thrown off, and first switch 13 all breaks off with second switch 23, and electric Wiring protection device recovers trip status.
Because thyristor Q1 provide biasing by direct current, but in the equal conducting of the positive-negative half-cycle of sinusoidal ac.No matter earth fault betides the positive half cycle or the negative half period of alternating current, but all immediate reactions and threading off of Wiring protection device have reduced the average dropout reaction time.
Electric Wiring protection device among this embodiment also comprises a simulation leakage switch 71, and its two ends are connected respectively to the current transformer not phase line or the zero line of homonymy.When electric Wiring protection device is in when resetting "on" position; Click close switch 71; Having electric current on the resistance R 1 flows through; Thereby produce the unsymmetrical currents testing circuit 40 output error detection signals that lead to errors at elementary winding 41, and then triggering signal drive circuit 50 produces drive signals and breaks off first switch 13 and second switch 23 to order about trip assembley therefor 60.
Under the normal situation of electric Wiring protection device, in the use, do not have electric current to flow through in electric screen conductor and the resistive branch road, thereby reduced power consumption, practiced thrift the energy.
Fig. 2 shows the circuit diagram of electric Wiring protection device according to an embodiment of the invention.As shown in the figure, the electric Wiring protection device among this embodiment comprises: phase line path 10, zero line path 20, ground wire path 30, error detect circuit 40, signal drive circuit 50, trip assembley therefor 60, electric screen conductor 19,29, temperature detect switch (TDS) 80.
Particularly, the two ends of the 3rd switch 33 also the parallel connection branch road, this branch road comprises light-emitting diode 77, resistance R 9.
Particularly, error detect circuit 40 comprises current transformer 49.Current transformer 49 comprises a secondary winding 48.Phase line path 10 and zero line path 20 comprise an elementary winding 41 of current transformer 49.Ground wire path 30 comprises another elementary winding of current transformer 49.Current transformer 49 is configured to produce the wrong detection signal in response to the pumping signal of elementary winding at secondary winding 48.Those skilled in the art will be understood that in the error detect circuit 40 can also comprise operational amplification circuit, is used for the signal of secondary winding 48 is amplified, to produce the wrong detection signal.
Elementary winding in the ground wire path 30 can have the identical number of turn with elementary winding 41, also can have the different numbers of turn.
Particularly, signal drive circuit 50 comprises full-wave rectification bridge B1, thyristor Q1.The AC power rectification of full-wave rectification bridge B1 to introducing with respect to the input side of current transformer 49 from phase line path 10 and zero line path 20 forms logically between diode D3 and D4, from output DC between diode D1 and the D2.The negative electrode of thyristor Q1 is connected to logically, and anode inserts the direct voltage biasing, and the control utmost point is connected to secondary winding 48.When wrong detection signal triggering thyristor Q1 conducting, all can flow through big current signal at thyristor Q1 and rectifier bridge B1, that is drive signal.Light-emitting diode 76 can index signal drive circuit 50 operating state, when rectifier bridge B1 had direct current output, light-emitting diode 76 lighted; When rectifier bridge B1 did not have direct current output, light-emitting diode 76 extinguished.
Error detect circuit 40 and signal drive circuit 50 shared identical logically.
Trip assembley therefor 60 is coupled to signal drive circuit 50, is configured to when said drive signal surpasses predetermined value, break off the connection of phase line path 10, zero line path 20, ground wire path 30.
Particularly, trip assembley therefor 60 comprises: solenoid 69 and iron core wherein.
Particularly, electric screen conductor 19,29 is connected to error detect circuit 40 through a resistive branch road and signal drive circuit 50 is logically common.This resistive branch road comprises resistance R 7.This resistive branch road also comprises another elementary winding of current transformer 49.
The electricity Wiring protection device can be in trip status (or claiming off state) and reset mode (or claiming channel status).Under trip status, first switch 13, second switch 23 and the 3rd switch 33 all break off.When pressing SR, through transmission, return pin and latch engagement of the miscellaneous parts such as return pin that are connected with SR.Remove the compressing to SR, return pin will drive the snap close counter motion, thereby make the switch 13 of winning, second switch 23, the 3rd switch 33 closures, and electric Wiring protection device gets into reset mode (channel status).When silicon-controlled device Q1 receives the wrong detection signal triggering and conducting can be flow through big current signal in the solenoid 69, that is drive signal; When drive signal surpassed predetermined value, the iron core in the solenoid 69 produced action percussion snap close, and return pin is thrown off with snap close, and first switch 13, second switch 23 and the 3rd switch 33 all break off electric Wiring protection device recovery trip status.
Because thyristor Q1 provide biasing by direct current, but in the equal conducting of the positive-negative half-cycle of sinusoidal ac.No matter earth fault betides the positive half cycle or the negative half period of alternating current, but all immediate reactions and threading off of Wiring protection device have reduced the average dropout reaction time.
The resistance of resistance R 9 can be taken as between 100k Ω～300k Ω.When electric Wiring protection device is in trip status, the 3rd switch 33 breaks off.Under the applied environment of civilian electricity, if on the ground wire path 30 leakage current generating is arranged, the electric current that flows through resistance R 9 is at most several milliamperes, can not cause personal injury; And light-emitting diode 77 is with shinny, with the leak current fault on the indication ground wire path 30.
One end of temperature detect switch (TDS) 80 is coupled to the control utmost point, the other end introducing bias voltage of silicon-controlled device; When temperature surpassed predetermined threshold, said temperature detect switch (TDS) was closed, thereby triggers said silicon-controlled device conducting, thereby produces said drive signal.
Particularly, an end of temperature detect switch (TDS) 80 is connected to the control utmost point of thyristor Q1, and the other end is connected between resistance R 5 and the R6, introduces dc offset voltage.When temperature surpasses predetermined threshold; Temperature detect switch (TDS) 80 closures; Dc offset voltage is introduced the control utmost point of thyristor Q1; Thereby trigger thyristor Q1 conducting, signal drive circuit 50 produces the corresponding driving signals and breaks off first switch 13, second switch 23 and the 3rd switch 33 to order about trip assembley therefor 60.Temperature detect switch (TDS) 80 can be a bimetal release, and it can be set to the input terminal 11 near phase line path 10 usually, for example near phase line input plug blades.
Electric Wiring protection device among this embodiment also comprises a simulation leakage switch 71, and its two ends are connected respectively to the current transformer not phase line or the zero line of homonymy.When electric Wiring protection device is in when resetting "on" position; Click close switch 71; Having electric current on the resistance R 1 flows through; Thereby produce the unsymmetrical currents testing circuit 40 output error detection signals that lead to errors at elementary winding 41, and then triggering signal drive circuit 50 produces drive signals and breaks off first switch 13, second switch 23 and the 3rd switch 33 to order about trip assembley therefor 60.
Under the normal situation of electric Wiring protection device, in the use, the electric screen conductor does not have electric current to flow through with comprising in the resistance R 7 resistive branch roads, thereby has reduced power consumption, has practiced thrift the energy.
Fig. 3 shows the circuit diagram of electric Wiring protection device according to another embodiment of the invention.As shown in the figure, the electric Wiring protection device among this embodiment comprises: phase line path 10, zero line path 20, ground wire path 30, error detect circuit 40, signal drive circuit 50, trip assembley therefor 60, electric screen conductor 19,29, temperature detect switch (TDS) 80.
Among this embodiment, the setting of phase line path 10, zero line path 20, ground wire path 30, signal drive circuit 50, trip assembley therefor 60 and electric screen conductor 19,29 and embodiment illustrated in fig. 2 in basic identical.
Error detect circuit 40 is coupled to phase line path 10 and zero line path 20, is configured to produce the wrong detection signal in response to the mistake of the mistake of phase line path 10 and zero line path 20 and/or ground wire path 30.
Particularly, the error detect circuit 40 among this embodiment comprises current transformer 49 and control chip U1.Current transformer 49 comprises a secondary winding 48.Phase line path 10 and zero line path 20 comprise an elementary winding 41 of current transformer 49.Ground wire path 30 comprises another elementary winding of current transformer 49.Current transformer 49 is configured to produce induced signal in response to the pumping signal of elementary winding at secondary winding 48.Secondary winding 48 is connected to control chip U1.Control chip U1 will produce the wrong detection signal according to the triggering of the induced signal on the secondary winding 48.
Particularly, in the signal drive circuit 50, the negative electrode of thyristor Q1 is connected to logically, and anode inserts the direct voltage biasing, and the control utmost point is connected to control chip U1.When the control utmost point of control chip U1 output error detection signal to thyristor Q1, thyristor Q1 will be triggered and conducting, all can flow through big current signal at thyristor Q1 and rectifier bridge B1, that is drive signal.Light-emitting diode 76 can index signal drive circuit 50 operating state, when rectifier bridge B1 had direct current output, light-emitting diode 76 lighted; When rectifier bridge B1 did not have direct current output, light-emitting diode 76 extinguished.
One end of temperature detect switch (TDS) 80 is coupled to the control utmost point, the other end introducing bias voltage of silicon-controlled device; When temperature surpassed predetermined threshold, said temperature detect switch (TDS) was closed, thereby triggers said silicon-controlled device conducting, thereby produces said drive signal.
Particularly, an end of temperature detect switch (TDS) 80 is connected to control chip U1, and is coupled to the control utmost point of thyristor Q1 through control chip U1, and the other end is connected between resistance R 5 and the R6, introduces dc offset voltage.When temperature surpassed predetermined threshold, temperature detect switch (TDS) 80 closures were introduced control chip U1 with dc offset voltage, thereby triggered control chip U1 output error detection signal; Thyristor Q1 receives triggering and the conducting of wrong detection signal, and signal drive circuit 50 produces the corresponding driving signals and breaks off first switch 13, second switch 23 and the 3rd switch 33 to order about trip assembley therefor 60.Temperature detect switch (TDS) 80 can be a bimetal release, and it can be set to the input terminal 11 near phase line path 10 usually, for example near phase line input plug blades.
Among this embodiment, electric screen conductor 19,29 is connected to error detect circuit 40 through a resistive branch road and signal drive circuit 50 is logically common.This resistive branch road comprises resistance R 7.This resistive branch road also comprises another elementary winding of current transformer 49.
The electricity Wiring protection device can be in trip status (or claiming off state) and reset mode (or claiming channel status).Under trip status, first switch 13, second switch 23 and the 3rd switch 33 all break off.When pressing SR, through transmission, return pin and latch engagement of the miscellaneous parts such as return pin that are connected with SR.Remove the compressing to SR, return pin will drive the snap close counter motion, thereby make the switch 13 of winning, second switch 23, the 3rd switch 33 closures, and electric Wiring protection device gets into reset mode (channel status).When silicon-controlled device Q1 receives the wrong detection signal triggering and conducting can be flow through big current signal in the solenoid 69, that is drive signal; When drive signal surpassed predetermined value, the iron core in the solenoid 69 produced action percussion snap close, and return pin is thrown off with snap close, and first switch 13, second switch 23 and the 3rd switch 33 all break off electric Wiring protection device recovery trip status.
Because thyristor Q1 provide biasing by direct current, but in the equal conducting of the positive-negative half-cycle of sinusoidal ac.No matter earth fault betides the positive half cycle or the negative half period of alternating current, but all immediate reactions and threading off of Wiring protection device have reduced the average dropout reaction time.
The resistance of resistance R 9 can be taken as between 100k Ω～300k Ω.When electric Wiring protection device is in trip status, the 3rd switch 33 breaks off.Under the applied environment of civilian electricity, if on the ground wire path 30 leakage current generating is arranged, the electric current that flows through resistance R 9 is at most several milliamperes, can not cause personal injury; And light-emitting diode 77 is with shinny, with the leak current fault on the indication ground wire path 30.
Electric screen conductor 19,29 is connected to rectifier bridge B1 logically through the resistive branch road that comprises resistance R 7.Occur because of aging, bending when the epidermis of outlet side phase line or zero line when damaged, possibly produce between the phase line of electric screen conductor and outlet side or zero line and be electrically connected.Outlet side here or input side are all for current transformer 49.When the electric screen conductor is electrically connected with the phase line of outlet side power line; Understanding some leakage current flows through from the outlet side phase line and comprises the resistive branch road of resistance R 7; Just flow through the elementary winding on this resistive branch road; Thereby lead to errors testing circuit 40 output error detection signals, and then triggering signal drive circuit 50 produces drive signals and breaks off first switch 13, second switch 23 and the 3rd switch 33 to order about trip assembley therefor 60.When the electric screen conductor is electrically connected with the zero line of outlet side power line; Understanding some leakage current flows through from the outlet side zero line and comprises the resistive branch road of resistance R 7; Just flow through the elementary winding on this resistive branch road; Thereby lead to errors testing circuit 40 output error detection signals, and then triggering signal drive circuit 50 produces drive signals and breaks off first switch 13, second switch 23 and the 3rd switch 33 to order about trip assembley therefor 60.Elementary winding on this resistive branch road can be around multiturn, to improve the sensitivity of power line detection of electrical leakage.
Electric Wiring protection device among this embodiment also comprises a simulation leakage switch 71, and its two ends are connected respectively to the current transformer not phase line or the zero line of homonymy.When electric Wiring protection device is in when resetting "on" position; Click close switch 71; Having electric current on the resistance R 1 flows through; Thereby produce the unsymmetrical currents testing circuit 40 output error detection signals that lead to errors at elementary winding 41, and then triggering signal drive circuit 50 produces drive signals and breaks off first switch 13, second switch 23 and the 3rd switch 33 to order about trip assembley therefor 60.
Under the normal situation of electric Wiring protection device, in the use, the electric screen conductor does not have electric current to flow through with comprising in the resistance R 7 resistive branch roads, thereby has reduced power consumption, has practiced thrift the energy.
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.The function of a plurality of parts that occur in the claim can be realized by independent hardware or software module.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.
Claims (10)
1. an electric Wiring protection device is characterized in that, comprising:
Phase line path (10), zero line path (20);
Error detect circuit (40) is coupled to said phase line path and zero line path, is configured to produce the wrong detection signal in response to the mistake of said phase line path and zero line path at least;
Signal drive circuit (50) is coupled to said error detect circuit, is configured to produce drive signal in response to said wrong detection signal;
Electric screen conductor (19,29) is arranged at the outlet side of said phase line path and zero line path, and this electric screen conductor dbus crosses said error detect circuit and/or signal drive circuit is coupled to said phase line path or zero line path;
Trip assembley therefor (60) is coupled to said signal drive circuit, is configured to the connection of when said drive signal surpasses predetermined value, breaking off said phase line path, zero line path.
2. electric Wiring protection device according to claim 1; It is characterized in that; Said error detect circuit comprises a current transformer (49) that has a secondary winding (48); Said phase line path and zero line path comprise an elementary winding (41) of said current transformer, and said current transformer is configured to produce the wrong detection signal in response to the pumping signal of elementary winding at said secondary winding.
3. electric Wiring protection device according to claim 2 is characterized in that, comprises a rectifier bridge, and this rectifier bridge is connected respectively to said phase line path and the zero line path input side with respect to said current transformer; Said electric screen conductor dbus is crossed a resistive branch road (R7) and is connected to this rectifier bridge logically.
4. electric Wiring protection device according to claim 3 is characterized in that, said resistive branch road comprises another elementary winding of said current transformer.
5. according to each described electric Wiring protection device in the claim 1 to 4, it is characterized in that said phase line path comprises first switch (13), said zero line path comprises second switch (23); Said trip assembley therefor is configured to when said drive signal surpasses predetermined value, break off said first switch and second switch, thus the connection of breaking off phase line path, zero line path.
6. electric Wiring protection device according to claim 5 is characterized in that, also comprises ground wire path (30), and this ground wire path comprises the 3rd switch (33);
Said error detect circuit is configured to also produce the wrong detection signal in response to the mistake of said ground wire path;
Said trip assembley therefor is configured to when said drive signal surpasses predetermined value, also break off said the 3rd switch, thus the connection of breaking off the ground wire path.
7. electric Wiring protection device according to claim 6 is characterized in that, the parallel connection of the two ends of said the 3rd switch one state indicator elment.
8. according to each described electric Wiring protection device in the claim 1 to 4; It is characterized in that; Said signal drive circuit comprises silicon-controlled device, and the control utmost point of this silicon-controlled device is coupled to said error detect circuit, is configured to the conducting in response to the triggering of said wrong detection signal.
9. electric Wiring protection device according to claim 8 is characterized in that, also comprises temperature detect switch (TDS) (80), and an end of this temperature detect switch (TDS) is coupled to the control utmost point of said silicon-controlled device, the other end is introduced bias voltage; When temperature surpassed predetermined threshold, said temperature detect switch (TDS) was closed, thereby triggers said silicon-controlled device conducting, thereby produces said drive signal.
10. electric Wiring protection device according to claim 9 is characterized in that said temperature detect switch (TDS) comprises bimetal release.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102372053A CN102340124A (en) | 2010-07-26 | 2010-07-26 | Electrical wiring protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102372053A CN102340124A (en) | 2010-07-26 | 2010-07-26 | Electrical wiring protection device |
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|---|---|
| CN102340124A true CN102340124A (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102372053A Pending CN102340124A (en) | 2010-07-26 | 2010-07-26 | Electrical wiring protection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326316A (en) * | 2013-05-21 | 2013-09-25 | 杭叉集团股份有限公司 | Vehicle detection control device for electric leakage and temperature |
| CN105337252A (en) * | 2014-06-24 | 2016-02-17 | 益而益(集团)有限公司 | Earth leakage protection apparatus having self-checking function |
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| WO2023173454A1 (en) * | 2022-03-14 | 2023-09-21 | 中山市开普电器有限公司 | Power line electronic leak detection and electronic leak protection circuit |
| CN117723886A (en) * | 2023-12-14 | 2024-03-19 | 深圳市万通信息技术有限公司 | Remote monitoring system and method for photoelectric composite cable |
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| CN103326316A (en) * | 2013-05-21 | 2013-09-25 | 杭叉集团股份有限公司 | Vehicle detection control device for electric leakage and temperature |
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| WO2023173454A1 (en) * | 2022-03-14 | 2023-09-21 | 中山市开普电器有限公司 | Power line electronic leak detection and electronic leak protection circuit |
| CN117723886A (en) * | 2023-12-14 | 2024-03-19 | 深圳市万通信息技术有限公司 | Remote monitoring system and method for photoelectric composite cable |
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Application publication date: 20120201 |