CN101615808A - A kind of electric fault detecting and protecting device - Google Patents
A kind of electric fault detecting and protecting device Download PDFInfo
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- CN101615808A CN101615808A CN200810039591A CN200810039591A CN101615808A CN 101615808 A CN101615808 A CN 101615808A CN 200810039591 A CN200810039591 A CN 200810039591A CN 200810039591 A CN200810039591 A CN 200810039591A CN 101615808 A CN101615808 A CN 101615808A
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Abstract
The invention provides a kind of electric fault detecting and protecting device, it comprises: phase conductive path and zero line conductive path, it is set between line side and the load-side, and be connected respectively to phase line and zero line at the power line of described load-side, this power line comprises metal screen layer, described metal screen layer is connected to the drainage point by drainage thread, and described drainage point is by electrically connecting one of at least in drainage element and described phase conductive path and the zero line conductive path; The electric fault signal deteching circuit, be used to detect current imbalance on described phase conductive path and the zero line conductive path and the electric current on the described drainage thread, and when the electric current on described current imbalance and/or the described drainage thread exceeds predetermined threshold, produce the interruption controls signal; The circuit interruption part is used to be subjected to described interruption controls signal controlling and in the electric connection of interrupting between described line side and the load-side on described phase conductive path and the zero line conductive path.According to electric fault detecting and protecting device of the present invention, not only have the residual current protecting function, can also detect and protect power line.
Description
Technical field
The present invention relates to a kind of electric fault detecting and protecting device, relate in particular to a kind of movably electric fault detecting and protecting device that is used for the household electrical appliance attaching plug.
Background technology
The leak current fault of household electrical appliance can cause user's personal injury.Usually the power input at household electrical appliance all is equipped with the attaching plug with residual current protecting function; general these existing attaching plugs with residual current protecting function can both detect phase line leakage current over the ground, interrupting power circuit when leakage current reaches predetermined value.
Most attaching plug with residual current protecting function is by detecting phase line, neutral line current imbalance at present; on detection ring, produce induced signal, after the comparison process, drive the tripping mechanism action; the circuit that disconnects input, output connects, thereby guarantees personal safety.For example, utility model patent ZL200620117867.6 promptly discloses a kind of ground-fault interrupter with reverse wiring protection function, and it can provide the residual current protecting function.But also there is following defective in existing attaching plug with residual current protecting function; promptly at attaching plug to one section power line is arranged between the power consumption equipment; if the lead in this section power line (phase line, zero line, ground wire) is because reasons such as aging, wearing and tearing make the inner conductive heart yearn exposed; may cause producing between phase line (line), zero line (neutral) and leak electricity also and then initiation fire; the safety of harm user's person and family's property, and existing attaching plug with residual current protecting function can't detect this fault.Also there is the device that detects the power line leak current fault at present.For example, utility model patent ZL200620134167.8 discloses a kind of power line that has the detection of electrical leakage conductor, it comprises three current-carrying copper cores and at least one detection of electrical leakage conductor that is used to detect leaky, can accurate detection go out whether there is leaky in the power line; Utility model patent ZL200620134149.X then discloses a kind of attaching plug with creepage protection function; this attaching plug can detect the leaky that exists in the power supply output line; when leak current fault appearred in power supply output line, this attaching plug cut off its power supply output.Above-mentioned three pieces of utility model patent documents all quote in full at this.
Yet, now also do not have a kind of device or equipment can provide the residual current protecting function can also detect the leak current fault of power line.Therefore, need a kind of electric fault detecting and protecting device, not only have the residual current protecting function, can also detect and protect power line.
Summary of the invention
The objective of the invention is to, a kind of electric fault detecting and protecting device that can be used for attaching plug is provided, not only have the residual current protecting function, can also detect and protect power line.
For achieving the above object, the present invention adopts following technical scheme, a kind of electric fault detecting and protecting device is provided, it comprises: phase conductive path and zero line conductive path, its be set at this electric fault detecting and protecting device can and the line side that electrically connects of power supply and can and the load-side that electrically connects of load between, and be connected respectively to phase line and zero line at the power line of described load-side, this power line comprises metal screen layer, described metal screen layer is connected to the drainage point by drainage thread, and described drainage point is by electrically connecting one of at least in drainage element and described phase conductive path and the zero line conductive path; The electric fault signal deteching circuit, be used to detect current imbalance on described phase conductive path and the zero line conductive path and the electric current on the described drainage thread, and when the electric current on described current imbalance and/or the described drainage thread exceeds predetermined threshold, produce the interruption controls signal; The circuit interruption part is used to be subjected to described interruption controls signal controlling and in the electric connection of interrupting between described line side and the load-side on described phase conductive path and the zero line conductive path.
Described electric fault detecting and protecting device can comprise electric current mutual inductance detection ring, described phase conductive path and zero line conductive path form the first elementary of described electric current mutual inductance detection ring, and described drainage thread passes described electric current mutual inductance detection ring or is wrapped in described electric current mutual inductance detection ring and forms that it is second elementary; Wherein, described electric fault signal deteching circuit is used for detecting current imbalance on described phase conductive path, the zero line conductive path and the electric current on the described drainage thread by the induced electromotive force that produces on the secondary coil that detects described electric current mutual inductance detection ring.
The present invention can also make further improvement, allows described drainage point respectively by the first drainage element and the second drainage element and described phase conductive path and the electric connection of described zero line conductive path.It should be noted that, first, second drainage selection of components should guarantee can not form between phase conductive path, the first drainage element, drainage point, the second drainage element, the zero line conductive path galvanic circle of big electric current, and the optional device of first, second drainage element comprises resistance, diode etc.This improves in the technical scheme, the heart yearn of arbitrary conductor wire is exposed in the described power line all can form discharge loop by drainage thread, the electric current of described electric fault signal deteching circuit on detecting drainage thread can produce described interruption controls signal when surpassing second predetermined threshold, circuit interruption partly is subjected to this interruption controls signal controlling and in the electric connection of interrupting between line side and the load-side on described phase conductive path and the zero line conductive path, thereby has guaranteed Electrical Safety.
Description of drawings
By reading the following detailed description of doing with reference to accompanying drawing to non-limiting example, other features, objects and advantages of the present invention will become more obvious;
Figure 1 shows that circuit diagram according to the electric fault detecting and protecting device of a specific embodiment of the present invention;
Figure 2 shows that circuit diagram according to the electric fault detecting and protecting device of another specific embodiment of the present invention;
Figure 3 shows that generalized section according to the mechanical structure of the transmission component that resets of the electric fault detecting and protecting device of a specific embodiment of the present invention.
Embodiment
In order to understand the present invention better, be described further below in conjunction with specific embodiments of the invention, but it does not limit the present invention.
Figure 1 shows that circuit diagram according to the electric fault detecting and protecting device of a specific embodiment of the present invention.Fig. 3 is the generalized section according to the mechanical structure of the transmission component that resets of the electric fault detecting and protecting device of a specific embodiment of the present invention.Describe this embodiment in detail below with reference to Fig. 1 and Fig. 3.
This electric fault detecting and protecting device comprises: phase conductive path and zero line conductive path, its be set at can and the line side that electrically connects of power supply and can and the load-side that electrically connects of load between, be used for the electric connection between line side and the load-side, phase conductive path and zero line conductive path are connected respectively to phase line and the zero line at the power line of described load-side, this power line comprises metal screen layer, described metal screen layer is connected to the drainage point by drainage thread, and described drainage point is by electrically connecting one of at least in drainage element and described phase conductive path and the zero line conductive path; The electric fault signal deteching circuit, be used to detect current imbalance on described phase conductive path and the zero line conductive path and the electric current on the described drainage thread, and when the electric current on described current imbalance and/or the described drainage thread exceeds predetermined threshold, produce the interruption controls signal; The circuit interruption part is used to be subjected to described interruption controls signal controlling and in the electric connection of interrupting between described line side and the load-side on described phase conductive path and the zero line conductive path.
As shown in Figure 1, the power line of load-side comprises phase line, zero line and ground wire, 15,16,17 have indicated the heart yearn of power line phase line, zero line, ground wire respectively, and 11,12,13 have indicated the outer insulating barrier of heart yearn of power line phase line, zero line, ground wire respectively.Phase conductive path is from the phase line end L in line side, via tie point N1, reset switch S1, tie point N2 and pass electric current mutual inductance detection ring LOOP and be connected to power line phase line 15.The zero line conductive path is from the zero line side N in line side, via reset switch S1, tie point N3 and pass electric current mutual inductance detection ring LOOP, again through being connected to power line zero line 16 behind the tie point N4.The ground terminal G in line side is directly connected to power line ground wire 17.The power line of load-side is connected to power consumption equipment or other loads, and the line side can be connected to power supply.When this electric fault detecting and protecting device was used for attaching plug, the line side connected the input of attaching plug.
The electric fault signal deteching circuit comprises assemblies such as electric current mutual inductance detection ring LOOP and integrated chip IC1.Phase conductive path and zero line conductive path pass electric current mutual inductance detection ring and form that it is first elementary.Also electrically connect by resistance R 4 and R5 between phase conductive path and the zero line conductive path, these two resistance are the drainage element, are the drainage point between R4 and the R5.In the present embodiment, power line phase line insulating layer 11 and zero line insulating barrier 12 outsides have all covered layer of metal screen 14, metal screen layer 14 links together, and being connected to drainage point between R4 and the R5 by drainage thread 18, this drainage thread 18 is wrapped in electric current mutual inductance detection ring LOOP and forms that it is second elementary.Certainly, drainage thread 18 only passes electric current mutual inductance detection ring LOOP and can form also that it is second elementary.Current imbalance and/or drainage thread 18 on phase conductive path and zero line conductive path have electric current to flow through, and can produce induced electromotive force at the secondary coil of electric current mutual inductance detection ring LOOP.When the current imbalance on phase conductive path and the zero line conductive path and/or the electric current on the drainage thread 18 exceed predetermined threshold, the induction electric that the secondary coil of electric current mutual inductance detection ring LOOP produces will definitely order about chip IC 1 at certain pin output interruption controls signal with the conducting of control silicon-controlled device.Electric fault signal deteching circuit shown in Figure 1 is that to adopt such as model with IC1 be that the low-power control chip of RV4140 is an example, and this chip is at pin 7 output SCR control signals, that is the interruption controls signal.
Circuit interruption partly comprises the solenoid SOL and the reset switch S1 of controllable silicon SCR, ribbon core.In the present embodiment, the control utmost point of controllable silicon SCR links to each other with the pin 7 of IC1.The circuit interruption part and the transmission component synergy that resets, the break-make of control reset switch S1.As shown in Figure 3, support 105 and base plate 106 are parts of the shell of electric fault detecting and protecting device.The running part that resets comprises reset button 108, back-moving spring 121, return pin 109, L type snap close 124 and cylinder 126.The top of return pin 109 has sphenocephaly 110 and groove 122.The horizontal arm of L type snap close 124 passes cylinder 126, and return pin 109 can move in the vertical direction in cylinder 126, and sphenocephaly 110 can pass perforation 125 on the horizontal arm of L type snap close 124 and make groove 122 and snap close 124 engagements.The end points of connector 136,137 is respectively equipped with electric contact 167,168,162,163, and these four electric contacts are four end points of corresponding reset switch S1 respectively.The SOL of solenoid shown in Fig. 1 is corresponding to the coil among Fig. 3 133, iron core 131 and spring 132.The groove 134 of iron core one end is by perforation on snap close 124 upright arms 128 and snap close 124 engagements.Cylinder 126 can by and support 105 or base plate 106 between spring remain on its initial position, for simplicity's sake, not shown.
When circuit was in initial condition, electric contact 167,168,162,163 did not contact, and reset switch S1 disconnects.
When the line side correctly is connected to power supply, press reset button 108, the groove 122 of return pin 109 and snap close 124 engagements, when return pin 109 is upspring under the effect of back-moving spring 121, drive cylinder 126 by snap close 124 and upspring, thereby make connector 137 be lifted, electric contact 167,168 contacts with 162,163 respectively, switch S 1 closure, phase conductive path and zero line conductive path normal power-up, load-side can obtain power supply from the power supply in line side.
When phase conductive path and zero line conductive path normal power-up, if current imbalance on phase conductive path and the zero line conductive path and/or the electric current on the drainage thread 18 exceed predetermined threshold, the induction electric that the secondary coil of electric current mutual inductance detection ring LOOP produces will definitely order about chip IC 1 at pin 7 output SCR control signals, controllable silicon SCR is subjected to this signal controlling and conducting, thereby making coil 133 upper reaches super-high-currents produce magnetic field drive iron core 131 moves, drive snap close 124 and deviate from groove 122, reset button 108 is got back to original position, cylinder 126 and connector 137 are also got back to original position, electric contact 167,168 and 162,163 contact disconnects, reset switch S1 disconnects, and load-side loses power supply.
The way of realization of the reset switch shown in Fig. 3 and the transmission component that resets only is exemplary, and other ways of realization also have a lot, can be with reference to utility model patent ZL200620117867.6 or ZL200620134149.X.It should be appreciated by those skilled in the art that and anyly can finish the reset function of reset switch S1 and the design of interrupt function all can be applied to the present invention.
When reset switch S1 closure, phase conductive path and zero line conductive path normal power-up.If phase conductive path generation Leaked Current of Line to Ground can cause the current imbalance on phase conductive path and the zero line conductive path, thereby produce induced electromotive force on the level coil secondarily by electric current mutual inductance detection ring LOOP.If above-mentioned current imbalance (that is phase line electric leakage) surpasses predetermined threshold, IC1 will be driven by this induced electromotive force and produce the interruption controls signal on pin 7, this interruption controls signal control thyristor SCR conducting, solenoid SOL upper reaches super-high-current, thereby producing the iron core 131 that orders about in the solenoid in magnetic field moves, the drive transmission component that resets makes reset switch S1 disconnect and connects.
When reset switch S1 closure, when phase conductive path and zero line conductive path normal power-up, if arbitrary lead all can form discharge loops by metal screen layer 14 and drainage thread 18 because of reason such as aging causes damaged its heart yearn that makes of insulating barrier exposed in the power line.For example, when 11 breakages of phase line insulating layer make that phase line heart yearn 15 is exposed, can pass through phase line 15, metal screen layer 14, drainage thread 18, R5, zero line 16 formation discharge loops; When 12 breakages of zero line insulating barrier make that zero line heart yearn 16 is exposed, can pass through zero line 16, metal screen layer 14, drainage thread 18, R4, phase line 15 formation discharge loops; Local line insulating layer 13 breakages make that ground wire heart yearn 17 is exposed, can pass through ground wire 17, metal screen layer 14, drainage thread 18 and via R4, phase line 15 formation discharge loops.No matter the insulating barrier of which lead is damaged and make its heart yearn exposed in the power line, all can form discharge loops by metal screen layer 14 and drainage thread 18, thereby produce induced electromotive force on the level coil secondarily by electric current mutual inductance detection ring LOOP.If the electric current on the drainage thread 18 surpasses predetermined threshold, IC1 will be driven by this induced electromotive force and produce the interruption controls signal on pin 7, this interruption controls signal control thyristor SCR conducting, solenoid SOL upper reaches super-high-current, thereby producing the iron core 131 that orders about in the solenoid in magnetic field moves, the drive transmission component that resets makes reset switch S1 disconnect and connects.R4, R5 should choose suitable resistance, can not be too little to cause unnecessary additional power consumption, and can not be too big so that reduce the detection sensitivity of electric fault detecting and protecting device to the breakage of power line wire insulation.If the R4 open circuit, then this electric fault detecting and protecting device can't detect the fault of zero line insulating barrier 12 breakages; If the R5 open circuit, then this electric fault detecting and protecting device can't detect the fault of phase line insulating layer 11 breakages.Preferably, R4 should select identical resistance with R5, so that electric fault detecting and protecting device is to the detection sensitivity unanimity of 11 breakages of phase line insulating layer or 12 breakages of zero line insulating barrier.
The structure of power line is exemplary and nonrestrictive in the above-mentioned present embodiment.A kind of power line that has a detection of electrical leakage conductor (below be referred to as patent power line W) is disclosed in utility model patent ZL200620134167.8, the patent power line W of any execution mode all can be applicable to the present invention in this utility model patent, is used for replacing the power line shown in Fig. 1 11 to 17.Patent power line W also comprises phase line, zero line and ground wire, with reference to figure 1, the phase line of patent power line W links to each other with the L end of phase conductive path and load-side respectively, its zero line links to each other with the N end of zero line conductive path and load-side respectively, its ground wire is held with the G of the G in line side end and load-side respectively and is linked to each other, and its detection of electrical leakage conductor and drainage thread 18 couple together the leak current fault that is used for detecting this patent power line W.
Also be provided with a test switch S2 in the present embodiment and be used to test whether operate as normal of electric fault detecting and protecting device; this test switch S2 one side is connected with phase conductive path at tie point N1 through current-limiting resistance R3, and opposite side is connected with the zero line conductive path at tie point N4.When the reset switch closure; when phase line and zero line normal power-up; if press test switch S3; can between phase line, zero line, discharge via R3, test switch S2; thereby cause the current imbalance on phase conductive path and the zero line conductive path; and by electric current mutual inductance detection ring LOOP secondarily level produce induced electromotive force on the coil; IC1 is driven by this induced electromotive force and produce the interruption controls signal on pin 7; make the controlled disconnection of reset switch S1 connect, thereby verified that this electric fault detecting and protecting device can operate as normal.
Adopting model with IC1 above is that the low-power control chip of RV4140 is the circuit diagram that example has been described the electric fault detecting and protecting device of present embodiment; similarly; it is the kernel control chip that the low-power control chip of RV4145 is used as the electric fault signal deteching circuit that electric fault detecting and protecting device of the present invention can also adopt such as model; this moment is because the difference of pin definitions; the design of electric fault signal deteching circuit need be made corresponding variation; corresponding circuit design can not repeat them here with reference to the user's manual of RV4140 chip and RV4145 chip.When the electric fault signal deteching circuit adopts integrated chip RV4145 to be core, it can comprise two detection rings, be sensing transformation detection ring and ground connection zero line transformation detection ring, phase conductive path and zero line conductive path can pass these two detection rings and form its separately first elementary, form its separately second elementary and drainage thread 18 can pass these two detection rings or be wrapped in these two detection rings.
Figure 2 shows that circuit diagram according to the electric fault detecting and protecting device of another specific embodiment of the present invention.Figure 3 shows that generalized section according to the mechanical structure of the transmission component that resets of the electric fault detecting and protecting device of a specific embodiment of the present invention.Describe this embodiment in detail below with reference to Fig. 2 and Fig. 3.
This electric fault detecting and protecting device comprises: phase conductive path and zero line conductive path, its be set at can and the line side that electrically connects of power supply and can and the load-side that electrically connects of load between, be used for the electric connection between line side and the load-side, phase conductive path and zero line conductive path are connected respectively to phase line and the zero line at the power line of described load-side, this power line comprises metal screen layer, described metal screen layer is connected to the drainage point by drainage thread, and described drainage point is by electrically connecting one of at least in drainage element and described phase conductive path and the zero line conductive path; The electric fault signal deteching circuit, be used to detect current imbalance on described phase conductive path and the zero line conductive path and the electric current on the described drainage thread, and when the electric current on described current imbalance and/or the described drainage thread exceeds predetermined threshold, produce the interruption controls signal; The circuit interruption part is used to be subjected to described interruption controls signal controlling and in the electric connection of interrupting between described line side and the load-side on described phase conductive path and the zero line conductive path.
As shown in Figure 2, the power line of load-side comprises phase line, zero line and ground wire, 15,16,17 have indicated the heart yearn of power line phase line, zero line, ground wire respectively, and 11,12,13 have indicated the outer insulating barrier of heart yearn of power line phase line, zero line, ground wire respectively.Phase conductive path is from the phase line end L in line side, via tie point N1, reset switch S1, tie point N2, and passes electric current mutual inductance detection ring LOOP and is connected to power line phase line 15.The zero line conductive path via reset switch S1, tie point N3, and passes electric current mutual inductance detection ring LOOP from the zero line side N in line side, again through being connected to power line zero line 16 behind the tie point N4.The ground terminal G in line side is directly connected to power line ground wire 17.The power line of load-side is connected to power consumption equipment or other loads, and the line side can be connected to power supply.When this electric fault detecting and protecting device was used for attaching plug, the line side connected the input of attaching plug.
The electric fault signal deteching circuit comprises assemblies such as electric current mutual inductance detection ring LOOP and integrated chip IC1.Phase conductive path and zero line conductive path pass electric current mutual inductance detection ring and form that it is first elementary.Also electrically connect by diode D1 and D2 between phase conductive path and the zero line conductive path, these two diodes are the drainage element, are the drainage point between D1 and the D2, and a side of D1 and D2 identical polar links together by the drainage point.In the present embodiment, power line phase line insulating layer 11 and zero line insulating barrier 12 outsides have all covered layer of metal screen 14, metal screen layer 14 links together, and being connected to drainage point between D1 and the D2 by drainage thread 18 and current-limiting resistance R5, this drainage thread 18 is wrapped in electric current mutual inductance detection ring LOOP and forms that it is second elementary.Certainly, drainage thread 18 only passes electric current mutual inductance detection ring LOOP and can form also that it is second elementary.Current imbalance and/or drainage thread 18 on phase conductive path and zero line conductive path have electric current to flow through, and can produce induced electromotive force at the secondary coil of electric current mutual inductance detection ring LOOP.When the current imbalance on phase conductive path and the zero line conductive path and/or the electric current on the drainage thread 18 exceed predetermined threshold, the induction electric that the secondary coil of electric current mutual inductance detection ring LOOP produces will definitely order about chip IC 1 at certain pin output interruption controls signal with the conducting of control silicon-controlled device.Electric fault signal deteching circuit shown in Figure 2 is that to adopt such as model with IC1 be that the low-power control chip of RV4140 is an example, and this chip is at pin 7 output SCR control signals, that is the interruption controls signal.
Circuit interruption partly comprises the solenoid SOL and the reset switch S1 of controllable silicon SCR, ribbon core.In the present embodiment, the control utmost point of controllable silicon SCR links to each other with the pin 7 of IC1.The circuit interruption part and the transmission component synergy that resets, the break-make of control reset switch S1.As shown in Figure 3, support 105 and base plate 106 are parts of the shell of electric fault detecting and protecting device.The running part that resets comprises reset button 108, back-moving spring 121, return pin 109, L type snap close 124 and cylinder 126.The top of return pin 109 has sphenocephaly 110 and groove 122.The horizontal arm of L type snap close 124 passes cylinder 126, and return pin 109 can move in the vertical direction in cylinder 126, and sphenocephaly 110 can pass perforation 125 on the horizontal arm of L type snap close 124 and make groove 122 and snap close 124 engagements.The end points of connector 136,137 is respectively equipped with electric contact 167,168,162,163, and these four electric contacts are four end points of corresponding reset switch S1 respectively.The SOL of solenoid shown in Fig. 2 is corresponding to the coil among Fig. 3 133, iron core 131 and spring 132.The groove 134 of iron core one end is by perforation on snap close 124 upright arms 128 and snap close 124 engagements.Cylinder 126 can by and support 105 or base plate 106 between spring remain on its initial position, for simplicity's sake, not shown.
When circuit was in initial condition, electric contact 167,168,162,163 did not contact, and reset switch S1 disconnects.
When the line side correctly is connected to power supply, press reset button 108, the groove 122 of return pin 109 and snap close 124 engagements, when return pin 109 is upspring under the effect of back-moving spring 121, drive cylinder 126 by snap close 124 and upspring, thereby make connector 137 be lifted, electric contact 167,168 contacts with 162,163 respectively, switch S 1 closure, phase conductive path and zero line conductive path normal power-up, load-side can obtain power supply from the power supply in line side.
When phase conductive path and zero line conductive path normal power-up, if current imbalance on phase conductive path and the zero line conductive path and/or the electric current on the drainage thread 18 exceed predetermined threshold, the induction electric that the secondary coil of electric current mutual inductance detection ring LOOP produces will definitely order about chip IC 1 at pin 7 output SCR control signals, controllable silicon SCR is subjected to this signal controlling and conducting, thereby making coil 133 upper reaches super-high-currents produce magnetic field drive iron core 131 moves, drive snap close 124 and deviate from groove 122, reset button 108 is got back to original position, cylinder 126 and connector 137 are also got back to original position, electric contact 167,168 and 162,163 contact disconnects, reset switch S1 disconnects, and load-side loses power supply.
The way of realization of the reset switch shown in Fig. 3 and the transmission component that resets only is exemplary, and other ways of realization also have a lot, can be with reference to utility model patent ZL200620117867.6 or ZL200620134149.X.It should be appreciated by those skilled in the art that and anyly can finish the reset function of reset switch S1 and the design of interrupt function all can be applied to the present invention.
When reset switch S1 closure, phase conductive path and zero line conductive path normal power-up.If phase conductive path generation Leaked Current of Line to Ground can cause the current imbalance on phase conductive path and the zero line conductive path, thereby produce induced electromotive force on the level coil secondarily by electric current mutual inductance detection ring LOOP.If above-mentioned current imbalance (that is phase line electric leakage) surpasses predetermined threshold, IC1 will be driven by this induced electromotive force and produce the interruption controls signal on pin 7, this interruption controls signal control thyristor SCR conducting, solenoid SOL upper reaches super-high-current, thereby producing the iron core 131 that orders about in the solenoid in magnetic field moves, the drive transmission component that resets makes reset switch S1 disconnect and connects.
When reset switch S1 closure, when phase conductive path and zero line conductive path normal power-up, if arbitrary lead all can form discharge loops by metal screen layer 14 and drainage thread 18 because of reason such as aging causes damaged its heart yearn that makes of insulating barrier exposed in the power line.For example, when 11 breakages of phase line insulating layer make that phase line heart yearn 15 is exposed, can pass through phase line 15, metal screen layer 14, drainage thread 18, R5, D2, zero line 16 formation discharge loops; When 12 breakages of zero line insulating barrier make that zero line heart yearn 16 is exposed, can pass through zero line 16, metal screen layer 14, drainage thread 18, R5, D1, phase line 15 formation discharge loops; Local line insulating layer 13 breakages make that ground wire heart yearn 17 is exposed, can pass through ground wire 17, metal screen layer 14, drainage thread 18, R5 and via D1, phase line 15 formation discharge loops.No matter the insulating barrier of which lead is damaged and make its heart yearn exposed in the power line, all can pass through metal screen layer 14, drainage thread 18 and R5 and form discharge loop, thereby produce induced electromotive force on grade coil secondarily by electric current mutual inductance detection ring LOOP.If the electric current on the drainage thread 18 surpasses predetermined threshold, IC1 will be driven by this induced electromotive force and produce the interruption controls signal on pin 7, this interruption controls signal control thyristor SCR conducting, solenoid SOL upper reaches super-high-current, thereby producing the iron core 131 that orders about in the solenoid in magnetic field moves, the drive transmission component that resets makes reset switch S1 disconnect and connects.D1 and D2 are connected back-to-back between phase conductive path and zero line conductive path that short circuit is connected with the zero line conductive path to avoid phase conductive path.If the D1 open circuit, then this electric fault detecting and protecting device can't detect the fault of zero line insulating barrier 12 breakages; If the D2 open circuit, then this electric fault detecting and protecting device can't detect the fault of phase line insulating layer 11 breakages.Preferably, D1 should select identical parameter with D2, so that electric fault detecting and protecting device is to the detection sensitivity unanimity of 11 breakages of phase line insulating layer or 12 breakages of zero line insulating barrier.
The structure of power line is exemplary and nonrestrictive in the above-mentioned present embodiment.The patent power line W of disclosed any execution mode all can be applicable to the present invention among the utility model patent ZL200620134167.8, is used for replacing the power line shown in Fig. 2 11 to 17.Patent power line W also comprises phase line, zero line and ground wire, with reference to figure 2, the phase line of patent power line W links to each other with the L end of phase conductive path and load-side respectively, its zero line links to each other with the N end of zero line conductive path and load-side respectively, its ground wire is held with the G of the G in line side end and load-side respectively and is linked to each other, and its detection of electrical leakage conductor and drainage thread 18 couple together the leak current fault that is used for detecting this patent power line W.
Also be provided with a test switch S2 in the present embodiment and be used to test whether operate as normal of electric fault detecting and protecting device; this test switch S2 one side is connected with phase conductive path at tie point N1 through current-limiting resistance R3, and opposite side is connected with the zero line conductive path at tie point N4.When the reset switch closure; when phase line and zero line normal power-up; if press test switch S3; can between phase conductive path, zero line conductive path, discharge via R3, test switch S2; thereby cause the current imbalance on phase conductive path and the zero line conductive path; and by electric current mutual inductance detection ring LOOP secondarily level produce induced electromotive force on the coil; IC1 is driven by this induced electromotive force and produce the interruption controls signal on pin 7; make the controlled disconnection of reset switch S1 connect, thereby verified that this electric fault detecting and protecting device can operate as normal.
Adopting model with IC1 above is that the low-power control chip of RV4140 is the circuit diagram that example has been described the electric fault detecting and protecting device of present embodiment; similarly; it is the kernel control chip that the low-power control chip of RV4145 is used as the electric fault signal deteching circuit that electric fault detecting and protecting device of the present invention can also adopt such as model; this moment is because the difference of pin definitions; the design of electric fault signal deteching circuit need be made corresponding variation; corresponding circuit design can not repeat them here with reference to the user's manual of RV4140 chip and RV4145 chip.When the electric fault signal deteching circuit adopts integrated chip RV4145 to be core, it can comprise two detection rings, be sensing transformation detection ring and ground connection zero line transformation detection ring, phase conductive path and zero line conductive path can pass these two detection rings and form its separately first elementary, form its separately second elementary and drainage thread 18 can pass these two detection rings or be wrapped in these two detection rings.
Certainly; the present invention can also have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof, those of ordinary skill in the art should make various corresponding changes according to the present invention, but these corresponding changes all should belong to the protection range of claim of the present invention.
Claims (8)
1. electric fault detecting and protecting device, it comprises:
Phase conductive path and zero line conductive path, its be set at this electric fault detecting and protecting device can and the line side that electrically connects of power supply and can and the load-side that electrically connects of load between, and be connected respectively to phase line and zero line at the power line of described load-side, this power line comprises metal screen layer, described metal screen layer is connected to the drainage point by drainage thread, and described drainage point is by electrically connecting one of at least in drainage element and described phase conductive path and the zero line conductive path;
The electric fault signal deteching circuit, be used to detect current imbalance on described phase conductive path and the zero line conductive path and the electric current on the described drainage thread, and when the electric current on described current imbalance and/or the described drainage thread exceeds predetermined threshold, produce the interruption controls signal;
The circuit interruption part is used to be subjected to described interruption controls signal controlling and in the electric connection of interrupting between described line side and the load-side on described phase conductive path and the zero line conductive path.
2. electric fault detecting and protecting device according to claim 1 is characterized in that, also comprises:
Electric current mutual inductance detection ring, described phase conductive path and zero line conductive path form the first elementary of described electric current mutual inductance detection ring, and described drainage thread forms the second elementary of described electric current mutual inductance detection ring,
Wherein, described electric fault signal deteching circuit is used for detecting electric current on described current imbalance and the described drainage thread by the induced electromotive force that produces on the secondary coil that detects described electric current mutual inductance detection ring.
3. electric fault detecting and protecting device according to claim 2 is characterized in that, described drainage point is respectively by the first drainage element and the second drainage element and described phase conductive path and the electric connection of described zero line conductive path.
4. electric fault detecting and protecting device according to claim 3 is characterized in that, described first, second drainage element comprises resistance or diode.
5. electric fault detecting and protecting device according to claim 4 is characterized in that, the described first drainage element is the identical resistance of resistance with the second drainage element.
6. electric fault detecting and protecting device according to claim 3 is characterized in that, the described first drainage element and the second drainage element are diode, and the polarity that these two diodes are put a side near described drainage is identical.
7. electric fault detecting and protecting device according to claim 6 is characterized in that, described drainage thread also is connected to described drainage point by current limiting element.
8. electric fault detecting and protecting device according to claim 2; it is characterized in that; described electric fault detecting and protecting device also comprises test switch; described test switch both sides electrically connect with described phase conductive path and zero line conductive path respectively, and these two tie points lay respectively at the not homonymy of described electric current mutual inductance detection ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810039591A CN101615808A (en) | 2008-06-25 | 2008-06-25 | A kind of electric fault detecting and protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810039591A CN101615808A (en) | 2008-06-25 | 2008-06-25 | A kind of electric fault detecting and protecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101615808A true CN101615808A (en) | 2009-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810039591A Pending CN101615808A (en) | 2008-06-25 | 2008-06-25 | A kind of electric fault detecting and protecting device |
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| Country | Link |
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| CN (1) | CN101615808A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340124A (en) * | 2010-07-26 | 2012-02-01 | 苏州益而益电器制造有限公司 | Electrical wiring protection device |
| CN102944261A (en) * | 2012-11-18 | 2013-02-27 | 山东电力集团公司检修公司 | Jumper galloping on-line monitoring device |
| CN104901272A (en) * | 2015-05-28 | 2015-09-09 | 深圳市良辉科技有限公司 | Earth leakage protection apparatus with conductor electric leakage detection function |
| CN104412116B (en) * | 2012-06-12 | 2017-10-10 | 公立大学法人大阪市立大学 | Earth detector and electrical leakage detecting method |
| CN108983041A (en) * | 2017-06-02 | 2018-12-11 | 通用电气航空系统有限公司 | Equipment for detecting failure in electric wire |
| 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 |
-
2008
- 2008-06-25 CN CN200810039591A patent/CN101615808A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340124A (en) * | 2010-07-26 | 2012-02-01 | 苏州益而益电器制造有限公司 | Electrical wiring protection device |
| CN104412116B (en) * | 2012-06-12 | 2017-10-10 | 公立大学法人大阪市立大学 | Earth detector and electrical leakage detecting method |
| US9903900B2 (en) | 2012-06-12 | 2018-02-27 | Osaka City University | Electric leakage detecting apparatus |
| CN102944261A (en) * | 2012-11-18 | 2013-02-27 | 山东电力集团公司检修公司 | Jumper galloping on-line monitoring device |
| CN102944261B (en) * | 2012-11-18 | 2014-12-17 | 山东电力集团公司检修公司 | Jumper galloping on-line monitoring device |
| CN104901272A (en) * | 2015-05-28 | 2015-09-09 | 深圳市良辉科技有限公司 | Earth leakage protection apparatus with conductor electric leakage detection function |
| CN108983041A (en) * | 2017-06-02 | 2018-12-11 | 通用电气航空系统有限公司 | Equipment for detecting failure in electric wire |
| US10983155B2 (en) | 2017-06-02 | 2021-04-20 | Ge Aviation Systems Limited | Apparatus to detect a fault in a wire |
| 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 |
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Open date: 20091230 |