CN201594727U - Protecting device with service life terminating indication before power off - Google Patents
Protecting device with service life terminating indication before power off Download PDFInfo
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- CN201594727U CN201594727U CN2009201681372U CN200920168137U CN201594727U CN 201594727 U CN201594727 U CN 201594727U CN 2009201681372 U CN2009201681372 U CN 2009201681372U CN 200920168137 U CN200920168137 U CN 200920168137U CN 201594727 U CN201594727 U CN 201594727U
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Abstract
The utility model relates to an electric wire device which comprises an automatic self-testing assembly. The automatic self-testing assembly is coupled to a plurality of line terminals or loading terminals, a detecting circuit, a faulting detecting circuit and a circuit breaker assembly, and is used for enabling the detecting circuit to generate an analogue sensor fault signal in the preset half cylinder of the AC line cycle according to the preset periodical testing schedule, and monitoring the fault detecting signal corresponding to the analogue sensor fault signal, and generating a testing result signal on the basis of monitoring the fault detecting signal. The automatic self-testing assembly also comprises an anti-noise determining circuit, wherein the anti-noise determining circuit is used for evaluating a plurality of testing results to provide the anti-noise service life terminating signal. The utility model is used for responding the anti-noise service life terminating signal, and then enables one of the conductive path for connecting the line terminals and loading terminals to break circuit.
Description
Technical field
The present invention relates generally to a kind of circuit protection device, relate in particular to a kind of protective device with end-of-life indicating device.
Background technology
The example of circuit protection device comprises ground-fault interrupter (GFCIs), arc-fault circuit interrupter (AFCIs) or had not only comprised GFCIs but also comprised the device of AFCI in a protective device.Circuit generally comprises at least one protective device.Certainly, circuit is used for the AC electricity is transferred to the one or more load circuits that are distributed in circuit from box of the circuit breaker.Load circuit can comprise any electric device, as lighting device, equipment or other this device.
The function of protective device is intended to eliminate those and can causes shocking by electricity or the malfunction of fire hazard.Most of common faults states are earth fault and arc fault.Therefore, protective device is the detection failure condition at first, cancels in response to this then load circuit is powered.Protective device disconnects with the line terminal of tripping protection device and the connection between the face terminals contact that is in open mode.
Arc fault is the electrical discharge between two or more conductors.Arc fault can be caused by the insulation in the damage on the two of live wire or center line or live wire and center line.But the insulation of corrupted can cause two low-power electric arc and fire hazards between the lead.Therefore, arc-fault circuit interrupter (AFCI) is protected circuit under in a single day situation that arc fault takes place.Arc fault manifests in the mode of the high-frequency current signal that characterized by " specific markers " usually.In other words, arcing fault signal generally comprises the concentration of energy in certain frequency band.Therefore, AFCI can be used for detecting various high-frequency signals, i.e. mark (signature), and in response to this and open circuit.
Earth fault be when current-carrying (charged) lead with contact and a kind of state of occurring when forming undesired current path.Described undesired current path is being represented shock hazard.Earth fault can also cause fire.Earth fault can be caused by multiple reason.If the wire insulation in the load circuit is damaged, then live line meeting ground connection forms shock hazard to the user.When device contact water, also earth fault may take place.Earth fault also may cause owing to the insulation of the damage in the facility.
Earth fault produces difference current between live line and center line.In normal operation, the electric current that flows in live line should equate with the electric current that flows in center line.Therefore, GFCI generally compares electric current in the live line and the return current in the center line by the difference current between sensing live line and the center line.GFCI can respond by starting alarm and/or open circuit.Circuit interruption is generally realized by the circuit between deenergization and the load.
During when the load neutral end or with conductor ground connection that the load neutral end is connected, produce the ground connection neutral state.This state is not represented shock hazard immediately.On the other hand, the ground connection neutral state is a kind of latent double faults state, and it may cause fatal consequence.Be recognized that when difference electric current during the GFCI tripping operation more than or equal to about 6mA.Yet when load neutral ground connection, because a part of return path electric current is drawn towards ground, it is insensitive that GFCI becomes.When this happens, before the GFCI tripping operation, may produce difference current until 30mA.Therefore, when live line and the equal ground connection of load neutral, GFCI is tripping operation not, causes the user to suffer serious injury or death.
Therefore, need provide a kind of protective device that can carry out self-test to all aforesaid malfunctions.In addition, need the self-test device to detect the fault of some assembly, for example thyristor (SCR).If detect fault mode, then device is driven into locking (lock-out) pattern, so that make power supply and load uncoupling for good and all.In addition, need device to warn the above end-of-life status of just having described of user.In other words, before being driven into locking, device comprises that the device of end-of-life indication is beneficial especially.
Summary of the invention
The invention solves as mentioned above needs.The present invention also provides and has been used to detect some kinds of methods that arrived end-of-life status.Protective device of the present invention also provides a kind of favourable indication, and plant failure has appearred in its warning user.This device provides the time of scheduled volume to the user, so that replaced protective device before this device for good and all has a power failure to face terminals.After the process time of scheduled volume, protective device for good and all has a power failure to face terminals.
The invention provides and be used to indicate the several different methods that has occurred end-of-life or plant failure.In one embodiment, indicating device is automatically started by self-test mechanism, and described self-test mechanism automatically discerns end-of-life status.In another method that the present invention provides, end-of-life status detects by manually pushing testing button.Testing button has started test process.If in response to test process, this protective device can not produce the test passes signal, and indicating device is switched on so.
In another embodiment, end-of-life/plant failure indication process can be included in this device does not have generation time to stop disconnecting protective device under the situation of test passes signal.Thereby this protective device recovers the load end power supply although the user can reset,, after the time, this protective device for good and all stops to power to load end at the process scheduled volume.
One aspect of the present invention relates to a kind of wire device, and it comprises automatic self-testing assembly, testing circuit, failure detector circuit and the circuit-breaker assembly that is coupled with a plurality of line scan pickup coil sides or a plurality of load end.According to predetermined routine test plan, this automatic self-testing device is used to make testing circuit to produce the analog sensor fault-signal during the predetermined half period of AC line period, monitor the fault detection signal corresponding, and on the basis of monitoring fault detection signal, produce the test result signal with this analog sensor fault-signal.This automatic self-testing assembly comprises that also antinoise (noise immunized) determines circuit, thereby it is used to assess a plurality of test results and provides antinoise end-of-life signal.In response to this antinoise end-of-life signal, one of conductive path that is connected with a plurality of load ends with a plurality of line scan pickup coil sides is interrupted.
Other features and advantages of the present invention will be elaborated in following content, and be described in these further features of the present invention to those skilled in the art in a way and advantage is conspicuous according to following, perhaps can recognize these feature and advantage by implementing invention described herein (comprising the detail specifications that has claim and accompanying drawing).
Should be appreciated that, the explanation of above-mentioned generality with and subsequent to describe in detail only be demonstration of the present invention, be intended to provide a kind of be used to understand the character that the present invention asks and the general introduction or the framework of characteristic.Include accompanying drawing to provide further understanding of the present invention, it is merged in and constitutes the part of specification.Accompanying drawing is for example understood various embodiment of the present invention, and explains principle of the present invention and operation jointly with specification.
Description of drawings
Fig. 1 is the schematic diagram of circuit protection device according to an embodiment of the invention;
Fig. 2 is the schematic diagram of circuit protection device according to a second embodiment of the present invention;
Fig. 3 is the schematic diagram of the circuit protection device of a third embodiment in accordance with the invention;
Fig. 4 shows the sequential of end-of-life indication of the present invention and locking feature.
Fig. 5 is the sequential chart that manual test feature of the present invention is shown;
Fig. 6 is the sequential chart that reset function of the present invention is shown;
Fig. 7 is the schematic diagram that comprises the protective circuit of power failure mechanism according to of the present invention;
Fig. 8 is the perspective view of power failure mechanism shown in Figure 7;
Fig. 9 is the schematic diagram of the circuit protection device of a fourth embodiment in accordance with the invention;
Figure 10 is the fragmentary cross-sectional view of power failure mechanism according to a fifth embodiment of the invention;
Figure 11 shows the mechanism of the Figure 10 under tripped condition; And
Figure 12 is the detail drawing of circuit-breaker according to another embodiment of the invention.
Embodiment
To specifically provide one exemplary embodiment of the present invention as a reference now, wherein the example of one exemplary embodiment shown in the drawings.As possible, in whole accompanying drawing, will use identical Reference numeral to refer to identical or approximate part.The one exemplary embodiment of protective device of the present invention is shown in Figure 1, indicates with Reference numeral 10 at large in the text.
As herein description and in Fig. 1, describe, the schematic diagram of circuit protection device 10 according to an embodiment of the invention is disclosed.GFCI 10 comprises ground-fault interrupter circuit and automatic self-testing circuit.The metal oxide varistor 15 of across-the-line (movistor 15) can be used for preventing that the high voltage surge that transmits is to installing 10 infringement on lead 11,13.Usually movistor 15 is of a size of 12mm.
Ground fault circuit comprises differential transformers 2, and it is used for sensing load-side earth fault.Transformer 3 is used for sensing ground connection neutral fault state as the neutral conveyer of ground connection.The neutral transformer 3 of differential transformers 2 and ground connection all is coupled to detector circuit 16.Power supply 18 is operated to carry out complete cycle to 16 power supplies of GFI detector circuit.Detector circuit 16 is handled transformer output.Based on transformer output, detector 16 provides output signal on output pin 20.As shown in Figure 1, detector output signal is carried out filtering by circuit 21.Control gate 1116 is coupled to detector 16 and is used to receive detector output signal 1120 or receives the detector output signal 20 of filtering.These signals import control gate 1116 by means of pin one 2 or pin one 1 respectively.Subsequently, thus control gate 1116 all imports gate circuit with this signal of two provides delay output signal (SCR output) to SCR 24.In addition, the output that it is pointed out that bypass circuit 1126 offers SCR 24 equally.Therefore, SCR 24 can come conducting by detector 16 outputs or by bypass circuit 1126 outputs.When SCR 24 conductings, it is used to make solenoid 38 energy storage.Solenoid 38 drives tripping mechanism 73 with open circuit.When being transferred to SCR 24 in any signal in these two signals is during negative half-cycle, SCR 24 can not make solenoid 38 energy storage.Yet applying one of these two signals or apply two signals simultaneously to SCR 24 all can provide the test passes signal to the input of testing circuit 400.
GFCI 10 also comprises GFI output circuit 350, and it is made up of coupling capacitor 40 and solenoid 38.GFI output circuit 350 makes detector 16 be connected with control gate 1116 with end-of-life monitoring circuit 400.Capacitor 40 and solenoid 38 constitute the resonator oscillating circuit.This oscillating circuit is in parallel with SCR 24 and buffering circuit 35.Capacitor 40 charges in the positive half period of AC electricity, but stops its discharge by blocking diode 42 in the negative half-cycle of AC electricity.Yet if the negative voltage at capacitor 40 two ends does not occur, these expression solenoid 38 short circuits promptly, do not exist solenoid magnetic field to make negative voltage collapse (collapse) and produce negative voltage.In addition, if comprising blocking diode 42, differential transformers 2, GFI detector circuit 16, circuit 21, power supply 18, SCR 24, the solenoid 38 of circuit 102, arbitrary assembly of capacitor 40 breaks down, then capacitor 40 will can not discharge via solenoid 38, and the negative voltage of the collapse field (collapsing field) of solenoid 38 can not appear being derived from capacitor 40 two ends.
When negative voltage appeared at capacitor 40 two ends, the input of end-of-life supervisory circuit 400 was driven to LOW, and first timer that triggers in the end-of-life supervisory circuit 400 enters the overtime pattern of monostable.Therefore, as long as operate above listed assembly rightly, promptly, the blocking diode 42 of circuit 102, differential transformers 2, GFI detector circuit 16, circuit 21, power supply 18, SCR 24, solenoid 38, capacitor 40, capacitor 40 will periodically discharge with first timer that resets.As a result, the output OUT 1 of circuit 400 can not send the end-of-life status signal.Yet if any in these assemblies breaks down, capacitor 40 just can be via solenoid 38 discharges, the negative voltage of the collapse field of solenoid 38 can not occur being derived from capacitor 40 two ends.In the case, first timer expired and OUT 1 send the end-of-life status signal.
In one embodiment, circuit 1125 is not connected with control gate 1116 with circuit 1127.In this embodiment, LED 1124 is lighted sending the end-of-life status signal, and second timers that are included in the circuit 400 are activated.When second timer expired, OUT 2 conducting SCR 1122, the electric current diode 42 of flowing through, solenoid 38 by energy storage so that circuit breaker 73 tripping operations.Those of ordinary skills are understood that end-of-life indicating device 1124 can adopt visual indication (being LED), can listen indication or can listen visible indication to realize.An advantage of this response method is to warn the user by indicating this to install end-of-life.This user is given the time of reasonable amount then, so that replaced this device before circuit breaker cuts off the power supply of load end.In one embodiment, predefined time delay is 24 (24) hours.Also can select any suitable time interval.For example, described delay can be set to 48 (48) hours.
In alternate embodiment, the end-of-life circuit comprises redundant part.In the case, circuit 1125 is arranged between the pin one 0 of OUT 1 and control gate 1116.In addition, circuit 1127 is arranged between second input of control gate pin one 3 and end-of-life circuit 400.Redundant LED 1140 is connected with control gate 1116.Described redundancy is used for detecting the also end-of-life status of response circuit 400.End-of-life status in the circuit 400 has changed the signal on the circuit 1127.LED 1140 is lighted sending the end-of-life status signal, and the 3rd timers that are included in the control gate 1116 are activated.The 3rd timer has and the same advantage of having described of second timer.When the 3rd timer expired, the output 13 conducting SCR 24 of control gate 1116, the electric current diode 42 of flowing through, solenoid 38 energy storage are so that circuit breaker 73 tripping operations.Those of ordinary skills should be understood that end-of-life indicating device 1140 can adopt visual indication (being LED), can listen indication or can listen visible indication to realize.
For the person of ordinary skill in the relevant, it is evident that, can make variants and modifications to end-of-life circuit 400 according to the structure of output circuit 350 and/or control gate 1116.For example, circuit 400 can utilize single monolithic integrated circuit to realize or utilize discrete timer and other discrete circuit elements to realize.For example, OUT 1 can be the anode of additional SCR device.Those of ordinary skills are understood that in category of the present invention also can carry out other circuit modifications.
Automatic self-testing circuit 1128 is coupled between live line 13 and the center line 11.Circuit 1128 comprises contact 1130, and it is arranged to diode 4 and resistor 8 and connects.When relay 1118 conductings during, produce the self-test signals by earth fault analog circuit 1128 with closing contact 1130.Those of ordinary skills are understood that test circuit 1128 can utilize various alternative fault simulation circuit to realize.For example, if control gate 1116 and self-test relay 1118 are programmed to only closing contact 1130 during the negative half-cycle of AC electricity, diode 4 can be omitted so.Perhaps, if contact 1130 is all closed at whole line period, should comprise diode 4 so so that the analogue ground fault current is limited in negative half-cycle.Flowing through the electric current of resistor 8 can be between charged and the center line, produces difference current between the conductor 13 and 11, and it comes sensing by transformer 2 according to aforesaid mode.Certainly, SCR 24 can not the transmission line electric current during the negative half-cycle of AC ripple.Yet,, will initiate aforesaid end-of-life program so if can't help detector 16 sends signal to SCR 24.
For the person of ordinary skill in the relevant, it is evident that, can make variants and modifications to control gate 1116 according to the selection and the design problem of device.For example, control gate 1116 can utilize microprocessor, application-specific integrated circuit (ASIC) (ASIC) or realize for known other the combination of electronic installation of one of ordinary skill in the art.In example shown in Figure 1, control gate 1116 is implemented as discrete microprocessor assembly.In another embodiment, control gate 1116 is incorporated among the ASIC jointly with other device assembly and subsystem.For example, ASIC can comprise detector 16, self testing circuit 400 and other this assemblies.
As the those of ordinary skill of correlative technology field understand, self-test relay 1118 can be any suitable type according to the characteristic of electric device.For example, relay 1118 can utilize electromechanical relay to realize.Relay 1118 also can utilize the solid-state switch such as thyristor, SCR, triac, transistor, MOSFET or other semiconductor device to realize.
The operation of description control door 1116 in more detail now.In the non-test mode interim of reappearing, detector output signal 20 or 1120 is directed to control gate 1116, as previously mentioned.When control gate 1116 was in non-test mode, control gate 1116 was by disconnecting self-test relay 1118, allow to detect the physical fault signal, avoiding the self-test signal to disturb simultaneously and do not start negative half-cycle self-test signal.In this state, GFI 10 can detect the physical fault signal in one of two half periods, but only in positive half period fault is responded.The non-test mode duration at interval can be selected in the time range between (1) second and (1) individual month.Be generally considered to be the maximum personal distance between the test in one month.In one embodiment, the non-test mode duration at interval is about one minute.Test/non-test period circulates repeatedly; Each non-test period is all succeeded by the test mode cycle, and each test period is all succeeded by the non-test mode cycle.
Therefore, GFI 10 is in self-testing mode in the test mode interval.In one embodiment, in first negative half-cycle of test mode at interval during, transmit the self-test signal.In another embodiment, work in simulation test each negative half-cycle in selected negative half-cycle or in test interval.In the examples of circuits that Fig. 1 describes, control gate 1116 starts the simulated failure signal by conducting self-test relay 1118 during negative half-cycle.Analog test signal makes detector 16 produce signal at output 20 or at alternative output 1120 places during each negative half-cycle.Output 1120 provides the information identical with output 20, but output 1120 is used to produce digital logic level.Control gate 1116 gating detectors 16 will output to SCR 24 by received signal during negative half-cycle.This is used for after negative half-cycle any spread signal being blocked the time of scheduled volume.
Select predetermined time interval so as any all the other spread signals all basically less than desired physical fault signal.Predetermined space generally is set in 30 to 50 milliseconds.As a result, any self-test signal that exceeds negative half-cycle can not cause that the mistake of SCR 24 starts.Yet the qualified signal of the partial test that transmits during negative half-cycle will cause that the timer in the annular detector 400 resets.For predetermined time interval, if the physical fault state appears at during aforesaid 30 to the 50 milliseconds stall cycles, then bypass circuit 1126 allows device 10 to respond according to UL trip time needs.
Test for device 10, the various embodiment of this device can all be equipped with can manually operated testing button 1132, and described testing button 1132 is used for Closing Switch contact 1134 so that start the charged fault-signal of analogue ground or alternatively start analogue ground center line fault-signal (not shown) when electric current is flowed through resistor 1136.If GFI 10 is exercisable, then the closure of switch contact 1134 starts trip operation.The purpose of testing button parts is to allow the user to control GFCI 10 as the switch that is used for applying to the load 1106 that is connected to device 10 electric power or removal electric power, and testing button 1132 and reset button 75 are put on " off " and " on " respectively in this case.The use of testing button 1132 does not influence the detection of end-of-life status and the performance of responding ability, and vice versa.
With reference to bypass circuit 1126 before, bypass circuit 1126 is used for walking around in some cases control gate 1116.Under the situation of earth fault, the operation of control gate 1116 can be postponed by the charge constant and the delay in the control gate 1116 (comprising the software correlation delay) of the electric capacity in the power supply 18.These delays can stop tripping mechanism 73 at the high amplitude earth fault current of known safe time limit maximum time internal cutting off greater than about 100mA.
In UL 943, provided the trip time condition.UL 943 comprises reversed time-current curve: t=(20/I)
1.43, wherein " I " is the fault electric current, and unit is milliampere (mA), and " t " is the trip time, and unit is second.Typical fault current value is between 6mA and 264mA.The 6mA electric current is " opening (let go) threshold value ".In other words, UL does not think dangerous less than the electric current of 6mA.The limit of 264mA corresponding to 132VAC (maximum mains voltage) divided by 500 Ohms (the minimum body resistance concerning the people).Utilization trip time curve allows the fault current of 6mA that 5 seconds maximum trip time is arranged.Allow the fault current of 264mA that the .025 maximum trip time of second is arranged.When fault current surpassed 100mA, bypass circuit 1126 was used to start SCR 24.According to the trip time curve, if fault current equals 100mA, the trip time of being calculated is 0.1 second (100 milliseconds).So 30 to 50 milliseconds stall cycles does not hinder UL trip time curve to be used to be lower than the actual earth fault of 100mA.For the physical fault electric current more than the 100mA, bypass circuit 1126 is ignored the stall cycles locking.Therefore, the present invention meets UL trip time condition.Those of ordinary skills are understood that bypass circuit 1126 and detector 16 can be combined in the single monolithic integrated circuit.
Another feature of the present invention relates to noise immunity.The source of transient noise (transient noise) comprises the switching noise from AC power supplies, the electrical noise relevant with the load of the commutating machine with brush, perhaps with various lamps or the relevant noise of instrument.Noise immunity is a consideration, because transient noise can be disturbed the self-test signal.In some cases, noise can disturb or offset the self-test signal.Therefore, although in GFCI 10, there is not internal fault status, the timer in the reset circuit 400 not still.Therefore, in one embodiment, for example, the timer in the circuit 400 was programmed to measure the time interval that crosses over four simulation test cycles or the time of measuring scheduled volume, as four minutes.Thereby circuit 400 one of only needs to detect during the time interval in four test passes signals and to reset to carry out timer.The transient noise situation may not can be disturbed four continuous negative half-cycles or is disturbed lasting 4 minutes.Thereby the timer of programming in this manner can make GFCI10 insensitive to the effect of transient state electrical noise.
The schematic diagram of circuit protection device is according to a second embodiment of the present invention disclosed just as here embodied and such depicted in figure 2.Fig. 2 is the schematic diagram of the embodiment that substitutes, and wherein, the fault simulation circuit produces simulation negative half-cycle earthed neutral conductor signal.With reference to No. 10/768,530, U.S. Patent application No, just like with its by reference it being incorporated into herein like that of intactly setting forth of institute in full, to be used for further detailed explanation to fault simulation signal.It is to be noted that test circuit 1128 does not comprise diode 4.
Grounded-neutral condition generates and the return path conductive path in parallel that is arranged between load end 1110 and the line scan pickup coil side 11.When not having grounded-neutral condition, earthed neutral conductor conveyer 3 is used for equivalent signals is coupled to live line and center line.As mentioned above, transformer 2 current sensor difference.Thereby when not having malfunction, the electric current that flows in the live line conductor has offseted the electric current that flows in center line.Yet when having grounded-neutral condition, the signal that is coupled on the center line conductor circulates as the electric current around parallel conductance path and the return path, forms the galvanic circle, and it is simulated by galvanic circle 1212.Because circulating current (circulating current) transmits via center line rather than live line, therefore produced difference current.The difference current that transformer 2 detects between live line conductor and center line conductor.Thereby in response to grounded-neutral condition, detector 16 produces signal on output 20.
In one embodiment, ground fault detector 16 utilizes RV 4141 integrated circuits of being produced by Fairchild Semiconductor to realize.The those of ordinary skill of described technical field is to be understood that can adopt any suitable device herein.Transformer 2 can utilize toroidal core (toroidally shapedmagnetic core) 1102 to realize, has twined winding 1104 around the described magnetic core 1102.Winding 1104 is coupled to the input 1202 of ground fault detector 16.Winding 1104 usually has 1,000 circle.Earthed neutral conductor conveyer 3 can utilize second toroidal core 1204 to realize, has twined winding 1206 around the described magnetic core 1204.Winding 1206 and capacitor 1208 are coupled in series to the gain output 1210 of ground fault detector 16.Winding 1206 generally has 200 circles.Live line conductor and center line conductor 13 and 11 pass the aperture (apertures) of magnetic core 1102 and 1204.
During grounded-neutral condition, the intrinsic low level electrical noise of circuit or ground fault detector 16 magnetic core 1102 or 1204 or both in form magnetic flux.Magnetic flux in the magnetic core 1204 is inducted by winding 1206.Magnetic core 1204 circulating current of inducting in electric loop 1212, described electric loop is induced flux in magnetic core 1102.From winding 1104 the signal that produces amplify by the gain of ground fault detector 16 so that in magnetic core 1204, produce bigger magnetic flux via winding 1206.Because this regeneration feedback action, ground fault detector 16 enters vibration.Its frequency is generally between 5kHz and 10kHz.This vibration produces signal at output 20.Control gate 1116 finally sends signal so that install 10 tripping operations to SCR 24.
In addition, the various embodiment of described device all can be equipped with manual control testing button 1132, and it is used for Closing Switch contact 1134.The resistor 1136 and send the charged fault-signal of analogue ground in case closing contact 1134, electric current are flowed through.In another embodiment, send analogue ground center line fault-signal (not shown) by activating testing button 1132.If GFI 10 can operate, the closure of switch contact 1134 starts trip operation.The purpose of testing button parts is to allow the user to control GFCI 10 as the switch that applies or remove electric power from load 1106.Thereby testing button 1132 and reset button 75 can be by difference marks " off " and " on ".The use of testing button 1132 does not influence the ability that detects and respond end-of-life status, and vice versa.
As herein description and in Fig. 3, describe, the schematic diagram of the circuit protection device of a third embodiment in accordance with the invention is disclosed.Fig. 3 shows the schematic diagram how the present invention is applied to general protective device 300.In addition, Fig. 3 has introduced a redundant solenoid.
If comprise transducer 1302, protective device is exactly AFCI so.If comprise transformer 2 and 3, protective device is exactly GFCI so.If comprise transducer 1302 and transformer 2 and 3, protective device is the AFCI-GFCI combination so.Usually, protective device can comprise the combination of one or more transducers or transducer, its be used for the sensing load or the AC circuit that powers to the load in the precarious position of one or more types.Arc fault mark in the transducer 1302 sensing load currents.Detector 1304 is similar to ground fault detector 16, but is used for detecting from any the signal in the employed various kinds of sensors of design.Detector can also provide signal to conveyer (as transformer 3).
Can increase other feature and advantage to each embodiment of the present invention.The mistake line that GFCI 10 can be equipped with such as mistake line (miswire) network 1308 detects part.With reference to US Patent No 6,522, No. 510, just like with its in full institute intactly set forth like that by with reference to it is incorporated into herein, be used for being described in more details to missing wire net 1308.
In simple terms, mistake wire net 1308 is used to produce the analogue ground malfunction.Between protective device 300 installation periods, if such according to what envision, supply voltage is coupled to line scan pickup coil side 11 and 13, and the electric current of the network 1308 of flowing through so can make protective device trip.Yet the electric current of the network 1308 of flowing through continues mobile fusible component in network 1308 because of I
2R is heated and opens a way.Fusible component can be realized by resistor 1310, its generally fusing in 1 to 10 second.Protective device 300 can reset behind fusible assembly open circuit.Subsequently, protective device 300 and testing circuit 400 are operated according to foregoing mode.Yet, when this device during installation when power supply being connected to load end 1108 and 1110 by the mistake lines, GFI 102 makes and interrupts contact 74 tripping operations before the fusible component open circuit.The electric current of network 1308 of flowing through stops in less than 0.1 second time.This cycle time is very short interval so that can not cause the fusible component damage.Thereby when protective device 300 quilt mistake lines, the fusible element in the network 1308 can be kept perfectly harmless.Therefore, reset button 75 does not influence reset operation.No matter signal is to testing circuit 400 or comes self-detection circuit 400 that protective device 300 all can not reset.
Reach as mentioned above shown in the embodiment of front, cross-over connection metal oxide varistor (MOV) (also being called movistor usually) on line can be included within the protective device to prevent from the high pressure surge of the AC power supplies infringement to protective device.The Movistor size is generally 12mm.Perhaps, when itself and inductance coupling high, also can in circuit, adopt littler MOV.
In the present embodiment, MOV 15 ' and solenoid 38 couplings.The induction reactance value of solenoid 38 under the surge voltage frequency generally greater than 50 Ohms.Induction reactance is used to reduce the surge current that movistor absorbs, and makes MOV 15 ' have lower energy storage rate.Therefore, the device of the big or small reduced one-tenth diameter 5mm of movistor.In addition, MOV can be replaced by in known other surge voltage guard methods of surge absorber condenser, air gap or one of ordinary skill in the art any fully.
Another feature embodiment illustrated in fig. 3 is relevant with the design of redundant solenoid.When reaching end-of-life, solenoid 38 generally lost efficacy because of forming open-circuit condition.Can increase solenoid 1314 to provide redundant.If solenoid 38 open circuits, so secondary (secondary) 401 is not received from test signal.Yet circuit 400 can make the protective device tripping operation by starting redundant solenoid 1314.Solenoid 1314 can magnetically be coupled to solenoid 38.Other redundant component also can be contained in the device 300.Redundant component allows protective device and/or allows circuit 400 to play a role.For example, the diode 1316 that is included in the power supply 18 can comprise two diode connected in parallel, if make a diode open-circuit, then second diode continues to remain on supply power voltage.
With reference to the sequential chart among the figure 4-6, it shows at the diverse ways that forever stops indication end-of-life status before the load end power supply of device.Described sequential chart shows and is for good and all stopping to provide the method for end-of-life indication to the user with the mode shearing device contact that can not reset before the load end power supply.
Fig. 4 shows the time sequencing of end-of-life indication and locking.As mentioned above, the negative half-cycle at the AC electricity periodically carries out self-test.Thereby signal " a " representative is from the reproduction test passes signal of the GFI part (being the input of end-of-life monitoring circuit 400) of device 10.Secondary signal (b) is represented first timer in the circuit 400.At the moment 1612 places, one of above-mentioned components listed lost efficacy, and represented end-of-life status.Therefore, receive last input pulse 1610 at 1614 places constantly by circuit 400.When first timer occurs when overtime, at 1618 places constantly end-of-life status appears.In other words, if in the time interval 1616, do not detect the test passes signal, then by the first timer generation time termination signal 1618.Signal (c) is represented end-of-life indicating device 1124.Pulse 1620 shows that LED1124 (perhaps audible indicator) can be applied in pulse to flash or periodic beeping sound.Perhaps, LED 1124 can be by lighting of continuing.In another embodiment, end-of-life indicating device 1140 can be connected so that from control gate 1116 (referring to Fig. 1 and Fig. 2) received signal.When detecting end-of-life status, control gate 1116 is used for producing intermittently signal to indicating device 1140.Signal (d) is represented block signal, as from the signal OUT 2 of circuit 400 or from the SCR output of door 1116.Block signal (d) produces after the time continue the scheduled volume of being set up by second timer.As shown in the figure, signal (d) produces closed venation and dashes 1624, and it for good and all disconnects the load end and the line scan pickup coil side of device 10 (300).One of ordinary skill in the art should know that signal (d) can be used as the LOW signal of activation, as Fig. 1 and/or shown in Figure 2.
In one embodiment of the invention, closed venation is used to make tripping mechanism 73 tripping operations towards 1624.In another embodiment, provided one group of independent redundant end-of-life contact.In this case, closed venation is used to distinguish described redundancy in contact structure towards 1624.Redundancy structure can not rely on the state (promptly reset or trip) of tripping mechanism 73.In another embodiment, end-of-life index signal 1628 can be included in interior provides energy so that continue to end-of-life indicating device 1124 (1140) after locking occurring.The flash of light that continues or the sound that beeps help the user location to cause the disabling device of power failure.
With reference to figure 5, provided the sequential chart that manual test part of the present invention is shown; Signal (a) is represented the manual test circuit.Pulse 1710 is produced by manually booting of testing button 1132.Signal (b) is represented test passes signal 1712.It is pointed out that in the case produce test passes signals 1712 by detector 16 and output circuit 350 in test passes interval 1714, expression protective device 10 is exercisable.Pulse 1718 represent testing button 1132 another manually boot.Yet, in the case, as test passes at interval in 1714 ' by any test passes signal 1712 of shortage proved, have end-of-life status.Therefore, generation time termination signal 1618 once more.Signal (c) is represented the operation of end-of-life indicating device 1124 (1140). Signal 1720 and 1726 is similar to foregoing signal 1620,1628.Signal (d) is represented block signal 1724, and it produced after the time 1722 of scheduled volume.Block signal 1724 makes the line scan pickup coil side of device 10 (300) for good and all disconnect connection from line scan pickup coil side.
Fig. 6 has provided the embodiments of the invention that comprise reset function.Signal (a) is represented test passes signal 1810.In addition, test passes signal indicating protective device 10 (300) can be used for carrying out sensing, detection and protective device 10 to meet one of desired at least predetermined state.At the moment 1812 places, one of above-mentioned components listed lost efficacy, in response to this, at the final test passes signal of 1814 places transmission constantly.Signal (b) refers to the output of SCR output or circuit 400.If in the time interval 1816, do not detect the test passes signal, then produce pulse 1818,73 tripping operations of indication tripgear.The trailing edge of pulse 1818 is manually depressed reset button 75 (Fig. 1) corresponding to the user.Signal (c) is represented the output of visual detector 1124 (perhaps audible indicator).The device 10 (300) in case the user has resetted, indicating device 1124 just begins flash of light, shows end-of-life status to have occurred.When tripping mechanism 73 resets, predetermined time interval 1824 beginnings.After elapsed time interval 1824, produce closed venation towards 1826 according to foregoing mode by control gate 1116 or by circuit 400.As a result, when predetermined time interval 1824 expirations, tripping mechanism 73 for good and all trips at the rising edge of pulse 1826.According to index signal (c), in view of foregoing reason, after the interval 1824, the indicator signal 1830 that continues can be provided so that provide energy to end-of-life indicating device 1124 (1140) constantly at the fixed time.
Should produce the test passes signal during the time interval 1622 (1722,1824), control gate 1116 and/or circuit 400 can be used to ignore described test passes signal.Therefore, when passing through predetermined time delay according to foregoing mode, device 10 (300) tripping operations.In alternate embodiment, control gate 1116 and/or circuit 400 can be used for or can be programmed to discern the test passes signal.
If discerned the test passes signal, then end-of-life signal and block signal all are cancelled.Another noise immunity feature of the present invention that Here it is.Reappear the test signal inefficacy if the noise on the distribution system temporarily makes, then install 10 and can recover, prevent that wrong end-of-life locking from occurring.Perhaps, can comprise " latency delays " between the beginning of 1622 (1722,1824) at the expiration and at interval in 1616 (1714,1816), interval.In this way, circuit 400 produces foregoing end-of-life signal, but after latency delays, end-of-life indicating device 1124 (1140) just is provided energy.Stop for being postponed till end-of-life status 24 to 48 hours (the scheduled volume times) afterwards that detect.The activation of indicating device can be postponed till detects end-of-life 5 seconds to 5 hours (latency delays intervals) afterwards.
The user recognizes end-of-life status by the end-of-life indicating device, thereafter, is stopping to give the time of consumer premise amount before the load end power supply.In another alternative embodiment, device 10 (300) counters that comprise in response to reset button.After end-of-life status occurs, stopping before load end is for good and all powered, counter distributes the reset cycle of scheduled volume for the user.During each reset cycle, reset button makes line scan pickup coil side can be connected to load end, but only limits in the preset time section.Thereby each reset cycle is used for reminding user's end-of-life status.For good and all stopping before load end power supply, the another kind of motivation of this device as an alternative, the reset cycle can be the duration of successively decreasing gradually.
One skilled in the art will recognize in category of the present invention, the time interval that can change or revise in the sequential chart to be described.Visual detector can be shades of colour or flash pattern, so that distinguish mutually with the indicating device of other types in being contained in device 10 (300), for example, trip indicator 1312 or when the load end (not shown) is powered, be used for luminous indicator light.The same position that the indicating device of two or more types is used in the shell of device 10 (300) is luminous.Visual or audible indicator can constantly develop by various patterns, sound or color, in order to the imminent blocking of continuous call user's attention.
The alternate embodiment that Fig. 7-9 has described to stop power supply after end-of-life status occurring.The embodiment that has described comprises redundant solenoid, if make the tripping operation solenoid relevant with the protective device circuit cognitive to end-of-life status, so redundant solenoid guarantees to stop to feed electrical power to load end.Perhaps, tripping mechanism itself can have end-of-life status.Testing circuit identifies described state and continues to start this indicating device and power failure mechanism.Power failure mechanism is independent of tripping mechanism in fact substantially and moves, and no matter tripping mechanism is in tripped condition or reset mode.
The description of doing as this place and Fig. 7 did describes discloses a kind of protective circuit 10 that comprises power failure mechanism.Power failure mechanism 1910 comprises resistors in parallel 1912,1914 and the SCR 1916 that is coupled between the line scan pickup coil side 11,13.When internal fault took place device 10 (300), resistor 1912,1914 was used to be heated to the temperature greater than predefined temperature threshold.When the temperature of resistor 1912,1914 during greater than threshold value, line scan pickup coil side 11,13 is from feedthrough (feed-through) load end 1108,1110 and socket load end 1108 ', 1110 ' decoupling zero.Because resistor 1912,1914 is arranged in parallel, so they heat independently.Dotted line 1922 expressions: when temperature surpassed threshold value, resistor 1912 was used to open contact 1918.Similarly, dotted line 1924 expressions: when temperature surpassed threshold value, resistor 1914 was used to open contact 1920.In another embodiment of the present invention, single resistor is used for heating and opens contact 1918 and 1920.
With reference to figure 8, described the perspective view of the power failure mechanism 1910 shown in Fig. 7. Resistor 1912 and 1914 is soldered to the bottom surface of printed circuit board (PCB) (PCB) 2010.Opening 2012 is positioned at the position that aligns with resistor 1912 and 1914 on the PCB 2010.Resistor 1912 and 1914 prevents that spring-loaded plunger 2014 from running through the opening 2012 on the plate 2010.Each plunger 2014 is used for supporting electrical connection sliver parts 2016 (electrically connecting bus-bar member).Each sliver 2016 is coupled at least one load end (1108,1108 ', 1110,1110 ') with line scan pickup coil side (11,13).As mentioned above, when 1912 and 1914 fusings were supported in welding, spring-loaded plunger 2014 passed hole 2012, has cut off the connection between line scan pickup coil side and the load end.In case this thing happens, just there is not the mechanism of this device that is used to reset.Therefore, changing device more.
As herein description and in Fig. 9, describe, the schematic diagram of the circuit protection device of a fourth embodiment in accordance with the invention is disclosed.GFCI 10 comprises GFI circuit 102 and self-test testing circuit 2110.GFI circuit 102 comprises standard GFCI device, wherein by differential transformers 2 sensing load-side earth faults.Transformer 3 is used for the sensing grounded-neutral fault, and described transformer 3 is a kind of earthed neutral conductor conveyers.The output of transformer 2 is handled by GFI detector circuit 16, and described GFI detector circuit 16 produces signal on output 20, and described signal carries out activating tripping operation SCR24 after the filtering in circuit 21.When SCR 24 conductings, it activates solenoid 38, and solenoid 38 is operated mousetrap device 73 subsequently, discharges a plurality of contacts 74 and disconnecting consumers.
Cross-over connection metal oxide varistor (MOV1) (also being called movistor usually) on line can be included in the protective device such as MOV 15, to prevent from the high pressure surge of the AC power supplies infringement to protective device.The Movistor size is generally 12mm.
Thereby, capacitor 40 constitutes GFI 102 output circuits to form the resonator oscillating circuit thus by being connected with solenoid 38.This oscillating circuit is in parallel with SCR 24 and buffering circuit 35.Capacitor 40 charges in the positive half period of AC electricity, stops its discharge by blocking diode 42 in the negative half-cycle of AC electricity.
In the present embodiment, life-span stop detection circuit and control gate all embody with the form of single parts, single control gate 2110.Control gate 2110 is coupled to power failure mechanism 1910, and it moves as follows.
When this device was in reset mode with simulated failure, the user pressed TEST button 1132.This fault is introduced by resistor 1136.Although the fault of being simulated is shown as earth fault, also can select simulated arc fault.The present invention similarly is applicable to GFCI, AFCI or GFCI/AFCI device.Control gate 2110 is similar to control gate 1116.Yet door 2110 comprises the input 2112 that is coupled to testing button 1132.When testing button 1132 was pressed, control gate 2110 provided energy for indicating device 1124 (1140).If the parts among the GFI 102 (being transducer 1102, detector 16, SCR 24 and tripping mechanism 73) can be operated, then this device normally moves, and tripping mechanism 73 is tripped.In response, control gate 2110 is removed power supply, indicating device 1124 (1140) deenergize (de-energized).
Yet, if one of parts among the GFI 102 can't move, that is, reaching its end-of-life status, indicating device 1124 (1140) continues according to foregoing mode that the time of scheduled volume sends visual or earcon at least so.After the process time of scheduled volume, control gate 2110 activates power failure mechanism 1910 once more in foregoing mode.
In another embodiment, power failure mechanism 1910 is omitted, and SCR 1916 operating breaker coils 38 or solenoid 1314 (referring to Fig. 3) independently connect for good and all line scan pickup coil side is disconnected from load end.
As here embodied with Figure 10 described in like that, the fragmentary cross-sectional view according to the power failure mechanism of fifth embodiment of the invention is disclosed.Power failure mechanism is similar to Fig. 3 and embodiment that Fig. 7 describes on function, because it is used for stopping electric under the situation of tripping operation solenoid 38 arrival end-of-life status.
Especially, Figure 10 has shown the tripping mechanism 73 at the reset position place, means contact 2204 and 2206 closures.Make contact 2204 and 2206 remain closed by the action of forcing to catch spring (trapped make-force spring) 2208.Spring 2208 acts on the escapement 2210, acts on the handle 2212 that resets, to mention return pin (reset latch) 2214 and to mention armature 2216 by influencing each other.Return pin 2214 comprises hole 2218.Armature 2216 comprises hole 2219.Hole 2218 and 2219 allow to reset the entering of tip 2222 of handle 2212.The handle 2212 that resets is kept in position by stopper 2224.Armature 2216 and printed circuit board (PCB) (PCB) mechanically are positioned on the shell 2228, so that the power on the spring 2208 all concentrates on the armature 2216.The electronic unit relevant with circuit diagram shown in each embodiment of the present invention can be arranged on the circuit board (PCB) 2226.
When device 10 (300) showed end-of-life status, resistor 1912 was designed to bring up to the temperature greater than predetermined threshold.Resistor 1912 is positioned physically with restriction case spring (lockout spring) 2202.Resistor 1912 (1914) preferably is mounted and welds, so that the body of resistor 1912 (1914) can stop moving of case spring 2202.
With reference to Figure 11, shown the mechanism of the Figure 10 under the tripped condition.When the magnetic field in the SCR 24 activation solenoids 38, tripped condition takes place, it pushes piston 2230 subsequently to replace return pin 2214.Replace return pin 2214 and allow flat part to eliminate the late spring interaction, removed the interaction between late spring 2214 and the armature 2216 then.Armature 2216 has and armature 2216 can be returned to memory storage with respect to the resting position of solenoid 38, opens contact 2204 and 2206 and make power supply and load disconnection.Principle is suitable for many mechanical structures shown in Figure 10-11.
Apply downward pressure on the reset button 75 and finish and reset by touching the user.When having applied downward pressure, escapement 2210 inserts the hole 2218 in the pin 2214 again.The pin 2214 with respect to shown in direction move.When removing downward pressure, escapement 2210 is recalibrated as described in before resembling and is mentioned armature 2216.Thereby, when piston 2230 shown in move on the direction when replacing the position of pin 2214, realize tripping operation.Finish and reset by apply and remove pressure to reset button 75.
Figure 11 has also demonstrated second pattern of tripping mechanism 73 tripping operations, and it can not reset after end-of-life status takes place.Protective device (for example GFI 102) lost efficacy in some way, so that predetermined state is not responded.Power failure mechanism 2200 comprises the circuit of in some way circuit in the mechanism 1910 being operated when being in end-of-life status.Resistor 1912 is shifted by the bias voltage of case spring 2202 physically, restriction that described resistor 1912 is no longer welded or the restriction that no longer is subjected to bonding agent in alternative embodiment.The outside (surface) 2203 that can for good and all replace pin 2214 shown in case spring 2202 is included on the direction.Even activate reset button 73, pin 2214 can not be aimed at escapement 2210.Thereby, resistor 1912 displacements are used for for good and all making the tripping mechanism tripping operation.Load end and permanent disconnection of line scan pickup coil side are needed alternative.
With reference to Figure 12, a kind of circuit-breaker of replacement has been described.Circuit-breaker comprises tripping mechanism 1506, interrupts contact 1508 and reset button 1510, the element of describing before it is similar to that is designated as reference element 73,74 and 75.Circuit-breaker is coupled to line conductor 11 and 13, and be used for when detecting true fault state or simulated failure state or when the automatic self-testing Signal Fail with one or more loads decoupling zero from the practical electric supply.Particularly, when decoupling zero takes place, have a plurality of air gaps 1512, it is used to make a plurality of support structures electrically isolated from one.Load for example can comprise the feedthrough end 1514 that is arranged in the protective device.The feedthrough end is used to connect the line to the further part of shunt circuit.Protect this shunt circuit part by protective device subsequently.Support structures also can comprise at least one the user-accessible socket 1516 that is arranged in the protective device.Socket be used for can attached load with the user the plug pairing.Therefore, user load is similarly protected by protective device.
As previously described, if device 10 has missed line unintentionally during being installed to shunt circuit, promptly supply voltage is connected to feedthrough end 1514; then can be configured so that when attempting to reset protective device; for example, when pressing reset button 1510, only temporarily reset.Perhaps, can be configured so that during the mistake connection state, blocking-up is to installing 10 (1300) abilities that reset protective device.No matter but be which kind of situation, air gap 1512 all can prevent at feedthrough end 1514 places from electric supply socket 1516 power supplies.At least one air gap 1512 can be each electric supply energized conductor is provided.The protection user is away from the malfunction of user in can attached load.Perhaps, only in single electric supply conductor, provide at least one air gap 1512.Stop socket 1516 power supplies.Therefore, impel the user before the state that may break down, just to correct the mistake connection state.In another was replaced, the electric supply conductor comprises air gap 1512 selectively so that support structures electrolysis coupling.
(especially in claims) are used term " ", " one ", " be somebody's turn to do " and similar terms thereof to be interpreted as not only comprising single but also are comprised a plurality ofly in describing context of the present invention, state or are clearly refuted by context on the contrary unless have in addition herein.Term " comprises ", " having ", " comprising " and " containing " be interpreted as open-ended term (promptly meaning " including but not limited to "), unless other explanations are arranged.That term " connection " is interpreted as being comprised in partly or on the whole is interior, by attached or be joined together, even there is something mediate.
The number range of herein enumerating only be as seriatim with reference to the stenography method that falls into each the independent value in this scope, unless statement is arranged in addition herein, and each independent value all is introduced in this specification, enumerated seriatim as it.
All method described herein can any suitable order be carried out, unless have in addition herein the statement or clearly refute by context on the contrary.Any and all examples provided herein or exemplary language (for example, " such as ") all only be to be used for illustrating better embodiments of the invention, rather than to scope dielectric imposed limits of the present invention, Unless Otherwise Requested.
Language in the specification should not be understood that to represent for implementing the necessary any not element of request of the present invention.
One of ordinary skill in the art be it is evident that, do not breaking away within the spirit and scope of the present invention and can make various modifications and variations the present invention.Be not intended to embodiments of the invention are limited on the disclosed particular form, on the contrary, be intended to cover all improvement, equivalent and replacement in the spirit and scope of the invention, as defined in the claims.Thereby, dropping within claims and the equivalent scope thereof if be intended to it, the present invention has just covered these improvement of the present invention and change so.
Claims (20)
1. wire device is characterized in that comprising:
A plurality of line scan pickup coil sides and a plurality of load end;
Be coupled to the testing circuit of described a plurality of line scan pickup coil sides, described testing circuit is used to respond at least one malfunction of propagating and produces the sensor fault signal on described a plurality of line scan pickup coil sides and/or described a plurality of load end;
Be coupled to the failure detector circuit of described testing circuit, described failure detector circuit is used for producing fault detection signal when described sensor fault signal surpasses predetermined level;
Be coupled to the circuit-breaker assembly of described failure detector circuit, described circuit-breaker assembly comprises one group of armature contact, and it is used to respond described fault detection signal and is driven into tripped condition and response reset activation and be driven into reset mode;
Be coupled to described a plurality of line scan pickup coil side or described a plurality of load end, described testing circuit, the automatic self-testing assembly of described failure detector circuit and described circuit-breaker assembly, described automatic self-testing assembly is used for making described testing circuit produce the analog sensor fault-signal during the predetermined half period in AC line cycle according to predetermined periodicity test plan, monitor the described fault detection signal corresponding with described analog sensor fault-signal, and based on to the monitoring of described fault detection signal and produce the test result signal, described automatic self-testing assembly comprises further that also antinoise determines circuit, it is used for a plurality of test results are assessed so that antinoise end-of-life signal is provided, and responds described antinoise end-of-life signal and at least one conductive path that connects described a plurality of line scan pickup coil sides and described a plurality of load ends is opened circuit.
2. device as claimed in claim 1 is characterized in that, described automatic self-testing assembly comprises at least one indicating device, and it is used to respond described life-span stop detection signal and sends index signal.
3. device as claimed in claim 2 is characterized in that, described index signal is optical signal, earcon, perhaps visual earcon.
4. device as claimed in claim 2 is characterized in that, described at least one indicating device comprises at least one light-emitting component.
5. device as claimed in claim 4 is characterized in that, described at least one light-emitting component is used to send code signal to represent one of multiple situation.
6. device as claimed in claim 5 is characterized in that, described multiple situation comprises a plurality of fault modes, and described a plurality of fault modes comprise open circuit solenoid, short circuit solenoid, short circuit SCR or open circuit SCR.
7. device as claimed in claim 5 is characterized in that, represented multiple situation comprises end-of-life status, tripped condition or reset mode.
8. device as claimed in claim 1 is characterized in that, described circuit-breaker assembly comprises SCR, at least one solenoid and circuit-breaker.
9. device as claimed in claim 8 is characterized in that, described circuit-breaker is the tetrapolar circuit circuit breaker, and it separates a plurality of socket load contact under tripped condition with described a plurality of line scan pickup coil sides and described a plurality of load end.
10. device as claimed in claim 8 is characterized in that, described at least one solenoid comprises primary electromagnetic coil and redundant solenoid.
11. device as claimed in claim 1 is characterized in that, the predetermined half period of described AC line period is the predetermined half period polarity of AC electricity.
12. device as claimed in claim 11 is characterized in that, the predetermined half period polarity of described AC electricity is negative polarity.
13. device as claimed in claim 1 is characterized in that, described automatic self-testing assembly comprises automatic switch mechanism, and it is used for introducing selectively described analog sensor fault-signal on described a plurality of line scan pickup coil sides or described a plurality of load end.
14. device as claimed in claim 13 is characterized in that, described automatic switch mechanism comprises and is coupled to the relay that is arranged in the switch on the test circuit.
15. device as claimed in claim 1 is characterized in that, described automatic self-testing assembly comprises timing circuit that is coupled to described failure detector circuit and the test circuit that is coupled to described a plurality of line scan pickup coil sides.
16. device as claimed in claim 1 is characterized in that, described predetermined periodicity test plan is included on the selected negative half-cycle in AC cycle and causes described analog sensor fault-signal.
17. device as claimed in claim 1 is characterized in that, described predetermined periodicity test plan is included on each negative half-cycle in AC cycle and all causes the analog sensor fault-signal.
18. device as claimed in claim 1 is characterized in that, described end-of-life signal responds a plurality of fault modes and produces, and described a plurality of fault modes comprise open circuit solenoid, short circuit solenoid, short circuit SCR or open circuit SCR.
19. device as claimed in claim 1 is characterized in that, described automatic self-testing device comprises at least one indicating device, and it is used for sending signal to open circuit solenoid, short circuit solenoid, short circuit SCR or open circuit SCR.
20. device as claimed in claim 1, it is characterized in that, when detecting described fault detection signal, the test of described test result signal indication success, and when not detecting described fault detection signal, the unsuccessful test of described test result signal indication.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/247,848 US7843197B2 (en) | 2004-06-15 | 2008-10-08 | Protective device with end-of-life indication before power denial |
| US12/247,848 | 2008-10-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201594727U true CN201594727U (en) | 2010-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201681372U Expired - Fee Related CN201594727U (en) | 2008-10-08 | 2009-08-31 | Protecting device with service life terminating indication before power off |
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| Country | Link |
|---|---|
| CN (1) | CN201594727U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753025A (en) * | 2011-03-04 | 2015-07-01 | 快捷半导体(苏州)有限公司 | Ground Fault Circuit Interrupter (gfci) Monitor And Ground Fault Simulation Method |
| CN108369881A (en) * | 2015-11-03 | 2018-08-03 | 豪倍公司 | The ground fault circuit interrupter that frequency of use is recognized and measured |
| US11635474B2 (en) * | 2019-09-30 | 2023-04-25 | Pass & Seymour, Inc. | Frequency dependent ground fault interrupt |
-
2009
- 2009-08-31 CN CN2009201681372U patent/CN201594727U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104753025A (en) * | 2011-03-04 | 2015-07-01 | 快捷半导体(苏州)有限公司 | Ground Fault Circuit Interrupter (gfci) Monitor And Ground Fault Simulation Method |
| CN104753025B (en) * | 2011-03-04 | 2019-01-04 | 快捷半导体(苏州)有限公司 | Ground fault circuit interrupter monitor and ground fault analogy method |
| CN108369881A (en) * | 2015-11-03 | 2018-08-03 | 豪倍公司 | The ground fault circuit interrupter that frequency of use is recognized and measured |
| CN108369881B (en) * | 2015-11-03 | 2020-03-10 | 豪倍公司 | Ground fault circuit interrupter using frequency identification and measurement |
| US11635474B2 (en) * | 2019-09-30 | 2023-04-25 | Pass & Seymour, Inc. | Frequency dependent ground fault interrupt |
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Granted publication date: 20100929 Termination date: 20120831 |