CN202218000U - Improved surge protection device - Google Patents
Improved surge protection device Download PDFInfo
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- CN202218000U CN202218000U CN2011201549380U CN201120154938U CN202218000U CN 202218000 U CN202218000 U CN 202218000U CN 2011201549380 U CN2011201549380 U CN 2011201549380U CN 201120154938 U CN201120154938 U CN 201120154938U CN 202218000 U CN202218000 U CN 202218000U
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Abstract
The utility model relates to an improved surge protection device, comprising a shell assembly with a plurality of line terminals and a plurality of load terminals. A fault detection circuit is coupled to at least one of the line terminals and is configured to respond to at least one detected fault signal in a power distribution system to generate a fault detection signal. A circuit interrupter is coupled to the fault detection circuit and is configured to enable the plurality of line terminals to be coupled to the plurality of load terminals, so as to form a conductive path under a reset state, and the circuit interrupter is responded to the fault detection signal under a tripping state to decouple the plurality of line terminals and the plurality of load terminals. A voltage transient suppression circuit is coupled to at least one of the plurality of the line terminals and is configured to generate a signal simulating at least one fault signal when the circuit is in a fault.
Description
Technical field
Present invention relates in general to electric wiring equipment, and relate in particular to the protectiveness wiring unit.
Background technology
Distribution system to such as the power supply of structures such as dwelling house, commercial building or other this mechanisms typically comprises one or more breaker plates that are coupled to AC power supplies.Certainly, breaker plate with the AC distributing electric power to the one or more branch circuits that are installed in the structure.Circuit typically can comprise one or more receptacle outlets, and can be commonly referred to load circuit in the art further with AC electric power transfer to one or more power consumption equipments.Receptacle outlet provides electric power to user accessible load, and said load comprises power line and plug, and plug can insert in the receptacle outlet.Yet, known the fault that some types have taken place in the various piece of distribution system.Therefore, can electric circuit protection equipment be set everywhere, promptly in breaker plate or in having the protection equipment of receptacle outlet in distribution system.Protection equipment can also be installed in the electric loading self.
There is polytype electric circuit protection equipment.For example, this equipment comprises ground-fault interrupter (GFCI), earth fault protection of instrumentation device (GFEP) and arc-fault circuit interrupter (AFCI).This tabulation comprises representative instance, and is not to be removing property.Some equipment comprise GFCI and AFCI.As its name, arc-fault circuit interrupter (AFCI), earth fault protection of instrumentation device (GFEP) and ground-fault interrupter (GFCI) are carried out different functions.Arc fault typically shows and is high-frequency current signal.Therefore, AFCI can be configured to detect various high-frequency signals and in response to this and open circuit.When current-carrying (live wire) conductor formed involuntary (unintended) current path with ground, earth fault took place.Because the one part of current that in circuit, flows is transferred in the involuntary current path, between live wire/zero line conductor, forms differential current.Involuntary current path shows as risk of shock.But earth fault and arc fault be fire hazard also." ground connection zero line " is the earth fault of another kind of type.When the load zero terminal perhaps was connected to the conductor ground connection of load zero terminal, such fault can take place.
Many incidents can produce the transient voltage pulse.For example, lightning can be introduced transient voltage in the distribution system.When inductive load is closed, when having the motor operations of noise brush, perhaps also can produce transient voltage by other loading condition.The amplitude of transient voltage is usually than big at least one order of magnitude of the amplitude of supply voltage.Known transient voltage damages protectiveness equipment, and the equipment that makes will stop operation as design.Thereby, cause trouble and exchange device more for the user, perhaps worse, make the user be in the unprotect state.
Thereby most equipment comprises the overload protection parts.Yet the surge protection parts have occupied sizable volume in the device housings.As a result, the overall size of equipment is relatively large, makes more to be difficult to equipment is installed in the concealed wire box (wall box).Another problem is that known surge protection parts self have the situation of end-of-life.If the surge protection parts break down, can not protection equipment avoid the injury that causes owing to transient voltage.
Therefore, need a kind of small-sized protection equipment, it comprises improved space-preservation surge protection layout, on distribution system, takes place after the voltage transient incident, and it continues to provide protection.Small-sized protection equipment must be configured to protect the user reliably and make it avoid the influence of the fault state in the distribution system.And, needing a kind of protection equipment, it is assembled into when the end-of-life situation face terminals and line terminal decoupling zero.
The utility model content
The present invention has solved above-mentioned demand through a kind of small-sized protection equipment is provided, and it comprises improved space preservation surge protection layout, on distribution system, takes place after the voltage transient incident, and this layout continues to provide protection.Small-sized protection equipment of the present invention is configured to protect reliably the user to avoid the influence of the fault state in the distribution system.And small-sized protection equipment of the present invention is assembled into when the end-of-life situation face terminals and line terminal decoupling zero.
In the detailed description hereinafter; To state other features and advantages of the present invention; And to those skilled in the art; After reading specification, be obvious with part, perhaps through realizing that the present invention described in this paper (detailed description, claims and the accompanying drawing that comprise hereinafter) recognizes.
Should be appreciated that aforementioned general description and the detailed description of hereinafter only are examples of the present invention all, and be intended to provide summary or framework, be used to understand the present invention such as its characteristic of advocating and characteristic.Comprise accompanying drawing providing, and accompanying drawing is comprised in this manual and constitutes its part further understanding of the present invention.Accompanying drawing shows each embodiment of the present invention, and together is used to explain principle of the present invention and operation with specification.
According to an aspect of the present invention, a kind of electric wiring protection equipment comprises:
Casing assembly comprises a plurality of line terminals and a plurality of face terminals;
The sensor cluster that comprises at least one transducer; This sensor cluster is coupling between said a plurality of line terminal and the said a plurality of face terminals, and said sensor cluster is configured to based on the AC power signal that transmits in the AC distribution system at least one sensor signal is provided;
Failure detector circuit is coupled at least one and said sensor cluster in said a plurality of line terminal, and said failure detector circuit is configured to produce fault detection signal in response to detecting at least a fault state in the distribution system;
Circuit interruption device; Be coupled to said failure detector circuit; Said circuit interruption device is configured to said a plurality of line terminals are coupled to said a plurality of face terminals; Under Reset Status, to form conductive path; And under tripped condition in response to said fault detection signal with said a plurality of line terminals and said a plurality of face terminals decoupling zero, when the contact that makes the circuit interruption device assembly in response to user excitation is closed, realize said Reset Status, when the contact that makes said circuit interruption device assembly in response to said fault detection signal is opened, realize said tripped condition; And
Voltage transient suppresses circuit, is connected between said a plurality of line terminal, and said voltage transient suppresses circuit and comprises
Metal oxide varistor; With respect to the ground coupling of said sensor cluster difference; Make a lead-in wire of said metal oxide varistor be coupled to first line conductor in the line side that is arranged on said sensor cluster; Another lead-in wire of said metal oxide varistor is coupled to second line conductor of the load-side that is arranged on said sensor cluster, and
The metal oxide varistor protective circuit; With said metal oxide varistor series coupled, said metal oxide varistor protective circuit is configured to limit the amount of electric energy of the function of at least one electrical quantity of conduct that is applied to said metal oxide varistor.
Preferably, said voltage transient suppresses circuit and comprises the inductance component that is coupled to said metal oxide varistor, and this inductance component is characterised in that the corresponding variable inductance property impedance of frequency with the signal that suppresses at said voltage transient to transmit in the circuit.
Preferably, the said metal oxide varistor setting of connecting with said inductance component.
Preferably, said inductance component comprises solenoid, and this solenoid is configured to activate said circuit interruption device in response to said fault detection signal.
Preferably, said equipment also comprises the auxiliary switch of connecting and being provided with said voltage transient inhibition circuit, and when said circuit interruption device was in tripped condition, said auxiliary switch suppressed circuit and said a plurality of line terminal decoupling zero with said voltage transient.
Preferably, said voltage transient suppresses second metal oxide varistor that circuit comprises parallelly connected setting with said metal oxide varistor.
Preferably, said circuit interruption device also comprises:
Be coupled to the switch block of said failure detector circuit, open said switch block in response to said fault detection signal;
Be coupled to the solenoid of said switch block, supply power to said solenoid in response to said switch block is in open mode; And
One group interrupts contact, and this group interruption contact is arranged between said a plurality of line terminal and the said a plurality of face terminals and operatively is coupled to said solenoid, is urged to tripped condition in response to organizing the interruption contact to said solenoid power supply.
Preferably, the said metal oxide varistor setting of connecting with said solenoid.
Preferably, said voltage transient suppresses circuit and also comprises the metal oxide varistor of connecting and being provided with said solenoid and auxiliary switch.
Preferably; Said equipment also comprises at least one indicating device that is coupled to said auxiliary switch; This at least one indicating device is configured to indicate tripped condition, Reset Status or end-of-life status, and this at least one indicating device comprises audio indicator and/or visual detector.
Preferably, said voltage transient suppresses circuit and comprises second metal oxide varistor that is arranged between said a plurality of line terminal or the said a plurality of face terminals.
Preferably, said voltage transient suppresses circuit and also comprises the gap structure that is coupling between said a plurality of line terminal or the said a plurality of face terminals.
Preferably, said failure detector circuit comprises differential transformer, and said metal oxide varistor is connected the two ends of said differential transformer differentially, makes the said leakage current of said differential transformer sensing.
Preferably; Said equipment also comprises the test circuit that is coupled to said failure detector circuit; Said test circuit is configured to produce test signal, and this test signal is simulated said at least a fault state, and wherein said test circuit comprises Test Switchboard; This Test Switchboard is configured to when said switch is in the close position, produce said test signal, and said Test Switchboard comprises the open position with two air gaps.
Preferably; Said equipment also comprises the test circuit that is coupled to said failure detector circuit; This test circuit is configured to produce test signal, and this test signal is simulated said at least a fault state, and wherein said test circuit produces said test signal automatically.
Preferably, said at least a fault state comprises arc fault situation or ground fault condition.
Preferably, said voltage transient suppresses circuit and also comprises filter circuit, and this filter circuit comprises the inductance component that is characterised in that the inductive impedance that depends on frequency.
Preferably; Said inductance component comprises the solenoid that is coupling between said failure detector circuit and the said circuit interruption device; This solenoid is configured to activate said circuit interruption device in response to said fault detection signal; Under the frequency of about 100KHz, said inductive impedance is more than or equal to about 500 ohm.
Preferably, the said solenoid setting of connecting with said metal oxide varistor.
Preferably, the setting of connecting with auxiliary switch of said solenoid and said metal oxide varistor, when said circuit interruption device was in tripped condition, said auxiliary switch suppressed circuit and said a plurality of line terminal decoupling zero with said voltage transient.
Preferably; Said metal oxide resistor can be under the situation that said metal oxide varistor breaks down conduct leakage current; Said failure detector circuit is configured to when said leakage current surpasses predetermined value, detect said leakage current, as said at least a fault state.
Preferably, when said equipment was in off state, said metal oxide resistor kept the difference coupling with respect to said sensor cluster.
Description of drawings
Fig. 1 is the calcspar according to the electric wiring equipment of first embodiment of the invention;
Fig. 2 is the perspective view of circuit gap structure according to an embodiment of the invention;
Fig. 3 is the perspective view of load gap structure according to another embodiment of the present invention;
Fig. 4 is the sectional view of the equipment shown in Fig. 1;
Fig. 5 is the circuit diagram according to GFCI embodiment of the present invention; And
Fig. 6 is a partial schematic diagram of protecting equipment according to another embodiment of the present invention.
Embodiment
Detailed in now existing example embodiment of the present invention, the example shown in the accompanying drawing.In the possibility part, use identical Reference numeral in the accompanying drawings to indicate identical or similar parts.The example embodiment of wiring unit of the present invention has been shown in Fig. 1, and has indicated generally by Reference numeral 10.
As that implemented among this paper and as shown in fig. 1, the calcspar according to the wiring unit 10 of first embodiment of the invention is disclosed.Fig. 1 is general protection equipment, and wherein detector 40 can be configured to GFCI detector, GFEP detector, AFCI detector and combination thereof.In other words, instruction of the present invention can be applicable to various types of protection wiring units.
During trouble-free normal running, contact 50 closures provide AC electric power to load 28 under Reset Status.In general, sensor cluster 32 is coupled to tracer 40.Tracer 40 is coupled to SCR44.When it was in conduction state, SCR44 was to tripping solenoid 46 power supplies.Then, tripping solenoid 46 drives tripping mechanism 48.When activating tripping mechanism 48, contact 50 is opened.Can equipment be urged to Reset Status from tripped condition through pressing replacement button 52.
If equipment 10 comprises the GFCI protection, sensor cluster 32 is configured to the differential current that senses flow is crossed conductor 12,14 so.When equipment 10 under normal condition when load 28 provides electric power, the differential current in the conductor 12,14 is zero.In other words, the electric current from the load outflow equates with the size of current that flow to load, polarity is opposite.Yet when having earth fault (30), the live wire conductor in the load 28 is coupled to ground.Though cross the electric current of live wire conductor by sensor cluster 32 senses flow, return current reduces, because flow through the current direction ground of earth fault 30, rather than returns through transducer 32.Thereby differential current is non-vanishing.If differential current surpasses scheduled volume, detector 40 provides fault-signal on detector outlet line 41.
As what those skilled in the art will recognize that, differential transformer 34 is the sensing differential current via the magnetic field of the current-induced that flows through conductor 12,14.Particularly, conductor 12,14 passes the hole of ring core 36.Non-zero current in the conductor (differential current) induced flux in ring core 36 is to generate signal in winding 38.According to the type of protection equipment, sensor cluster 32 can comprise the additional sensor (not shown), such as current transformer, shunt, voltage divider, additional ring core transformer etc.Select this transducer with the interested fault state of sensing.To provide to detector 40 from winding 38 with from the signal that possibly be included in other transducers in the sensor cluster 32.
As stated, detector 40 confirms whether represent fault state from the signal of sensor cluster 32.If detect fault state, detector 40 provides signal to semiconductor switch 44 so, to supply power to solenoid 46.Then, solenoid 46 activates tripping mechanism 48, to open circuit breaker contact 50.The contact 50 that opens circuit makes live wire face terminals 26 be connected with fire line terminal 22 disconnections at least, is connected but also can be used to make zero line face terminals 24 to break off with zero terminal 20.In a word, equipment 10 tripping operations.
When equipment 10 tripping operations, electric current stops to flow through fault 30.Along with removing the electric power that provides to fault, detector 40 can not provide fault detection signal to semiconductor switch 44 again.Semiconductor switch 44 is closed, and solenoid 46 outages.Solenoid 46 energising is so that the time interval between the time of the time of circuit interruption device tripping operation and its outage after successfully eliminating fault state, usually less than 25 milliseconds.In the embodiment shown in fig. 1, use miniaturization structure to implement solenoid 46 because its need not to select size with bear under the situation of solenoid continued power with the heat that produces.
As stated, known transient voltage infringement protection equipment, the equipment that makes will stop operation as design.Connect metal oxide varistor (MOV) 54 so that transient voltage is clamped down on predetermined threshold through span line and/or face terminals, can protect equipment 10 to avoid the influence of high voltage transient.Certainly, calculate predetermined voltage threshold, make equipment 10 hold out against transient event.Yet when this device was used to protection from transients is provided, MOV 54 necessary sizes were relatively large, so that transient voltage is clamped down on appropriate threshold effectively.The diameter of MOV 54 can be greater than 12mm.As what can expect, the MOV of 12mm is more expensive relatively usually.
Therefore, a protection from transients characteristic of the present invention comprises combination use MOV 56 and inductance component, such as solenoid 46.The common amplitude of voltage transient is 1 to 6kV.Because their duration is shorter relatively, they have the frequency content of possibility greater than 100kHz.On the other hand, the sun of solenoid 46 resists under the frequency of 100kHz usually greater than 500 ohm.Thereby, can use the frequency dependence of coil impedance to protect MOV 56.The size that therefore, can reduce MOV 56 is to utilize the frequency dependence of coil impedance.In other words, the diameter of MOV 56 can be less than or equal to 7mm, and still can clamp down on voltage in appropriate threshold, and this is because the solenoid impedance has limited the magnitude of current through MOV 56.This method also provides cost benefit.Compare with bigger MOV, less MOV is comparatively cheap.And, increased the life expectancy of MOV 56 significantly by the impedance of solenoid 46, because it has limited the magnitude of current that flows through MOV to given voltage transient amplitude.Yet MOV 56 still possibly experience the end-of-life situation.
If the amplitude of voltage transient is enough big, then the end-of-life situation possibly take place.If there are a large amount of voltage transients, also the end-of-life situation possibly take place.Environmental stress also with cause that fault is relevant.Reason whatsoever, when end-of-life, MOV 56 resistance that becomes in essence increases gradually.If the resistance of MOV 56 is less than about 100 ohm, then solenoid 46 is coupled to power supply fully, to activate tripping mechanism 48, interrupts contact 50 thereby open.The electric current of resistance of can also directed flow crossing MOV 56 is through solenoid 46.If do not interrupt, electric current will make solenoid 46 burn.
The present invention includes auxiliary switch mechanism, burn to avoid solenoid.Auxiliary switch 58 is configured to connect with solenoid 46.Auxiliary switch 58 is coupled to tripping mechanism 48, perhaps alternatively is coupled to interrupt contact 50, makes that the contact of auxiliary switch 58 is opened when circuit interruption device is in tripped condition.Can be through manually activating replacement button 52 replacement equipment 10.This can also cause the contact of auxiliary switch 58 closed.In case reset, solenoid 46 is coupled to power supply by means of the resistance of MOV 56 once more, and likewise, tripping mechanism 48 is opened the contact of contact 50 and auxiliary switch 58.In a word, when MOV 56 end-of-lifes, solenoid 46 is temporarily power supply only.When the action that at every turn repeats to reset was attempted, solenoid 46 activated tripping mechanism.Even MOV 56 has experienced the end-of-life situation, equipment 10 is also kept its defencive function.Yet, a warning is arranged.
If the end-of-life resistance of MOV 56 is greater than 100 ohm, solenoid 46 possibly be not enough to be coupled to voltage source so that interrupt mechanism's 48 tripping operations.If interrupt mechanism does not trip, the electric current that then flows through solenoid 46 will not interrupted by auxiliary switch 58.The not interruptive current that flows through solenoid 46 possibly make solenoid burnt.
With reference to dotted line 101, in alternative, can comprise that MOV 100 avoids high voltage transient with protection equipment 10.Different with MOV 56, MOV 100 prevents that to all end-of-life resistance values solenoid from burning.It should be noted that MOV 100 is connected in series with solenoid 46.Thereby, with to MOV 56 described similar modes, by the impedance of solenoid 46 it is protected.Yet because the tandem compound of MOV 100 and solenoid 46, the electric current that flows through tandem compound forms differential current in the conductor that passes differential transformer 34.Detector 40 makes unit trip in response to differential current and with aforementioned manner.The predetermined threshold of GFCI is generally 6mA, and for GFEP or AFCI, is generally 30mA.Just in case the electric current that the end-of-life resistance of MOV produces is greater than the detection threshold in the detector 40, equipment 10 will trip so, and auxiliary switch 58 will be opened to prevent that solenoid 46 from burning.
Certainly, if the electric current of tandem compound that flows through MOV 100 and solenoid 46 less than detection threshold, then equipment 100 will not trip.Yet solenoid 46 is configured to bear the continuous current of this amplitude.As illustrating, if the resistance of MOV 100 less than about 4000 ohm, the equipment that has the 30mA detection threshold so will trip, because the electric current that produces will be greater than threshold value.On the other hand, along with MOV 100 resistance become big, promptly resistance becomes greater than about 4000 ohm, and the electric current of generation is less than the differential current threshold value, and equipment 100 will not trip.Yet solenoid 46 is configured to bear the electric current less than detection threshold.Therefore, under two kinds of situation, solenoid can not burn, because the voltage transient which couple is to tracer, and produces differential current, and it causes the protection unit trip again.Protection equipment of the present invention is safe and reliable in the face of the end-of-life situation time.
Another feature of the present invention relates to and prevents to make equipment 10 tripping operations from the brief signal of transducer 32 by what during the voltage transient incident, produce.Especially, can low pass filter 102 be arranged between detector output end 41 and the SCR44.Filter 102 is configured to filter the transient current that flows through MOV 100, to prevent that semiconductor switch 44 is in response to the voltage transient incident.As a result, tripping mechanism 48 will not receive harmful triggering of these voltage transient incidents.In alternative, low pass filter 102 can be embodied in the detector 40, to avoid the use of discrete parts.
Another feature of the present invention is, gap (200,300) is provided, and is used to absorb the energy from the most serious transition.For example, known because the voltage transient that lightning forms produces 10kV and/or 10kA.Gap is arranged in the equipment 10, thereby does not produce the output signal from sensor cluster 32 through the surge current of gap.In other words, gap 200,300 is configured to make discharging current not show as the differential current that possibly sensed by transformer 34.Gap 200,300 allow protection equipment 10 extremely serious voltage transient, or the electric current that produces by this voltage transient under maintain operating conditions.
With reference to figure 2, show the perspective view of equipment 10, it shows according to gap structure 200 of the present invention.Gap structure 200 is arranged on line terminal 20, between 22, and be positioned under the sensor cluster 32.Contact assembly 50 is embodied as moveable contact 206,208 and fixed contact therefor 210,212.Especially, cantilever section 202 is connected to line zero line terminals 20, and cantilever section 204 is connected to circuit fire line terminal 22.Moveable contact 206,208 is separately positioned on the far-end of cantilever beam 202,204.Face terminals 24,26 electric cars are connected to fixed contact therefor 210,212.Tripping mechanism 48 is configured to that moving contacting piece makes their be electrically connected to (206,210) and (208,212) when equipment 10 is reset, and when equipment 10 tripping operations, moves them and make their break off electrical connection.
As shown in fig. 1, interstice structure 300 can be arranged on load conductor 16, between 18.With reference to figure 3, the perspective view of load gap structure 300 is disclosed.Gap structure 300 is arranged on conductor 16, between 18, it is connected to fixed contact therefor 210,212 with face terminals 24,26.Gap structure 300 also is configured to absorb the energy that is produced by serious voltage transient incident.
The structure that it is suitable that the present invention expects the use any kind is interrupted contact 50 with enforcement.With reference to the U.S. Patent Application Serial Number No.10/900769 that submitted on July 28th, 2004, said document is incorporated herein by reference at this in full, so that illustrate in greater detail various types of circuit interruption structures that can be used for embodiment of the present invention.
Fig. 4 is the partial section that the equipment 10 of test circuit 400 and testing button 402 is shown.Contact 404 is normally opened.Use GFCI as an example, when depressing testing button 402, test circuit 400 is coupled to zero line line terminal 20 (same with reference to the indicative icon among the figure 1) with live wire face terminals 26.The electric current that passes through test circuit 400 that produces by differential transformer 34 with the mode identical with real ground fault condition sensing.Gap between the contact of opening 404 need be greater than predetermined space, and is impaired during the voltage transient incident to prevent test circuit 400.Predetermined gap is approximately 0.100 inch.Yet, force testing button 402 0.100 inch any demand of advancing will not meet ergonomics with closed gap.Therefore, through gap 406 and 408 are provided, can reduce the gap between testing button 402 and the contact 404.Should be noted that MOV (56,100) and gap structure (200,300) provide protection from transients to test circuit 400.
In another embodiment, test loop 400 can also be configured to provide the automatic test to equipment 10.With reference to United States Patent(USP) No. 6674289 and U.S. Patent Application Serial Number No.10/668654, said document is incorporated herein by reference at this in full, is used to illustrate in greater detail automatic testing circuit 400.
With reference to figure 5, show the circuit diagram of GFCI embodiment 10 '.Equipment 10 ' comprises feedthrough terminal 501, and it is configured to equipment 10 ' is connected to the distribution of socket power supply downstream.Equipment 10 ' also comprises socket face terminals 502, and it is configured to accept can connect from the user plug of load.Interrupting contact 505 is configured to when equipment 10 ' is in tripped condition, feedthrough terminal 501 broken off connection from face terminals 502.
Comprise replacement or the tripped condition of indicating device with warning users equipment 10 '.Indicating device can comprise visual detector, audible indicator or both.This indicating device is configured to launch stable indication, perhaps, can send intermittent indication, the buzzer that flash of light perhaps can be listened such as vision.Especially, equipment 10 ' provides indicating device 506, itself and auxiliary switch 58 parallel coupled.Reference view, when equipment 10 ' was connected to AC power supplies and tripping operation, indicating device 506 transmitted.Indicating device 508 can with auxiliary switch 58 series coupled.When equipment 10 ' was connected to power supply and is reset, indicating device 508 transmitted.Indicating device 506 may be combined or used separately with indicating device 508.Should be noted that MOV 100 (or 56) has limited the amplitude of voltage transient, otherwise it possibly form the end-of-life situation at auxiliary switch 58 or in indicating device 506,508.
With reference to figure 6, show the partial schematic diagram of equipment according to another embodiment of the present invention.In this embodiment, MOV 600 is connected face terminals 24,26 two ends.MOV 600 is coupled to differential transformer 34, so that when the end-of-life situation takes place, produce differential current.Transformer 34 is coupled to the load-side of equipment 10.With aforesaid mode, differential current is detected by detector 40.In turn, detector 40 provides signal so that solenoid 46 is supplied power to semiconductor switch 44.In response to this, tripping mechanism 48 is activated, and opens to interrupt contact 50.Therefore, before MOV 600 can be overheated, interrupt the end-of-life situation among the MOV 600.Through interrupting contact 50, realized interruption of current.MOV 56 and MOV 100 can be coupled to line terminal 20,22 with aforesaid mode by means of solenoid 46.
Be incorporated herein all lists of references that this paper quotes, comprise publication, patent application and patent, just as independent with indicate every part of list of references particularly and state the same in full at this.
Be to be understood that (in the text of the claim of especially enclosing) uses a technical term " one " and " one " and " said " and similar word in describing text of the present invention, covered odd number and plural number, only if this paper indicates perhaps and the obvious contradiction of text in addition.Term " comprises ", " having ", " comprising " and " containing " be to be understood that for open-ended term (promptly mean " including, but not limited to "), only if dated especially.Term " connection " be to be understood that for local or intactly be included in interior, be attached to or link together, even some intermediates are arranged.
The scope of the value of quoting among this paper only is intended to as independent with reference to the stenography method that falls into each independent values in the scope, only if this paper particularly points out, and each independently is worth and is included in the specification, just as its independent reference in this article.
All methods as herein described can be carried out with any suitable order, only if among this paper in addition indication or with the obvious contradiction of text.The typical term that use is any or all instance or this paper provided (for example " such as "), only be intended to be convenient to illustrate better embodiments of the invention, and scope of the present invention do not applied any restriction, unless specifically stated otherwise.
Any language all should not be construed as and shows that the element that any non-requirement is protected is necessary for embodiment of the present invention in the specification.
It is obvious to the skilled person that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications and change the present invention.Be not intended to the present invention is constrained to particular form or disclosed form, on the contrary, the present invention falls into covering like all modifications, alternative construction and equivalent in the spirit and scope of the invention that claim limited of enclosing.Thereby the present invention is intended to cover modification of the present invention and change, as long as they fall into the scope of enclose claim and equivalent thereof.
Claims (22)
1. an electric wiring is protected equipment, comprising:
Casing assembly comprises a plurality of line terminals and a plurality of face terminals;
The sensor cluster that comprises at least one transducer; This sensor cluster is coupling between said a plurality of line terminal and the said a plurality of face terminals, and said sensor cluster is configured to based on the AC power signal that transmits in the AC distribution system at least one sensor signal is provided;
Failure detector circuit is coupled at least one and said sensor cluster in said a plurality of line terminal, and said failure detector circuit is configured to produce fault detection signal in response to detecting at least a fault state in the distribution system;
Circuit interruption device; Be coupled to said failure detector circuit; Said circuit interruption device is configured to said a plurality of line terminals are coupled to said a plurality of face terminals; Under Reset Status, to form conductive path; And under tripped condition in response to said fault detection signal with said a plurality of line terminals and said a plurality of face terminals decoupling zero, when the contact that makes the circuit interruption device assembly in response to user excitation is closed, realize said Reset Status, when the contact that makes said circuit interruption device assembly in response to said fault detection signal is opened, realize said tripped condition; And
Voltage transient suppresses circuit, is connected between said a plurality of line terminal, and said voltage transient suppresses circuit and comprises
Metal oxide varistor; With respect to the ground coupling of said sensor cluster difference; Make a lead-in wire of said metal oxide varistor be coupled to first line conductor in the line side that is arranged on said sensor cluster; Another lead-in wire of said metal oxide varistor is coupled to second line conductor of the load-side that is arranged on said sensor cluster, and
The metal oxide varistor protective circuit; With said metal oxide varistor series coupled, said metal oxide varistor protective circuit is configured to limit the amount of electric energy of the function of at least one electrical quantity of conduct that is applied to said metal oxide varistor.
2. equipment according to claim 1; It is characterized in that; Said voltage transient suppresses circuit and comprises the inductance component that is coupled to said metal oxide varistor, and this inductance component is characterised in that the corresponding variable inductance property impedance of frequency with the signal that suppresses at said voltage transient to transmit in the circuit.
3. equipment according to claim 2 is characterized in that, the setting of connecting with said inductance component of said metal oxide varistor.
4. equipment according to claim 2 is characterized in that said inductance component comprises solenoid, and this solenoid is configured to activate said circuit interruption device in response to said fault detection signal.
5. equipment according to claim 2; Also comprise with said voltage transient and suppress the auxiliary switch that circuit is connected and is provided with; When said circuit interruption device was in tripped condition, said auxiliary switch suppressed circuit and said a plurality of line terminal decoupling zero with said voltage transient.
6. equipment according to claim 1 is characterized in that, said voltage transient suppresses second metal oxide varistor that circuit comprises parallelly connected setting with said metal oxide varistor.
7. equipment according to claim 1 is characterized in that, said circuit interruption device also comprises:
Be coupled to the switch block of said failure detector circuit, open said switch block in response to said fault detection signal;
Be coupled to the solenoid of said switch block, supply power to said solenoid in response to said switch block is in open mode; And
One group interrupts contact, and this group interruption contact is arranged between said a plurality of line terminal and the said a plurality of face terminals and operatively is coupled to said solenoid, is urged to tripped condition in response to organizing the interruption contact to said solenoid power supply.
8. equipment according to claim 7 is characterized in that, the setting of connecting with said solenoid of said metal oxide varistor.
9. equipment according to claim 7 is characterized in that, said voltage transient suppresses circuit and also comprises the metal oxide varistor of connecting and being provided with said solenoid and auxiliary switch.
10. equipment according to claim 9; Also comprise at least one indicating device that is coupled to said auxiliary switch; This at least one indicating device is configured to indicate tripped condition, Reset Status or end-of-life status, and this at least one indicating device comprises audio indicator and/or visual detector.
11. equipment according to claim 1 is characterized in that, said voltage transient suppresses circuit and comprises second metal oxide varistor that is arranged between said a plurality of line terminal or the said a plurality of face terminals.
12. equipment according to claim 1 is characterized in that, said voltage transient suppresses circuit and also comprises the gap structure that is coupling between said a plurality of line terminal or the said a plurality of face terminals.
13. equipment according to claim 1 is characterized in that, said failure detector circuit comprises differential transformer, and said metal oxide varistor is connected the two ends of said differential transformer differentially, makes the said leakage current of said differential transformer sensing.
14. equipment according to claim 1; Also comprise the test circuit that is coupled to said failure detector circuit; Said test circuit is configured to produce test signal, and this test signal is simulated said at least a fault state, and wherein said test circuit comprises Test Switchboard; This Test Switchboard is configured to when said switch is in the close position, produce said test signal, and said Test Switchboard comprises the open position with two air gaps.
15. equipment according to claim 1; Also comprise the test circuit that is coupled to said failure detector circuit; This test circuit is configured to produce test signal, and this test signal is simulated said at least a fault state, and wherein said test circuit produces said test signal automatically.
16. equipment according to claim 1 is characterized in that, said at least a fault state comprises arc fault situation or ground fault condition.
17. equipment according to claim 1 is characterized in that, said voltage transient suppresses circuit and also comprises filter circuit, and this filter circuit comprises the inductance component that is characterised in that the inductive impedance that depends on frequency.
18. equipment according to claim 17; It is characterized in that; Said inductance component comprises the solenoid that is coupling between said failure detector circuit and the said circuit interruption device; This solenoid is configured to activate said circuit interruption device in response to said fault detection signal, and under the frequency of about 100KHz, said inductive impedance is more than or equal to about 500 ohm.
19. equipment according to claim 18 is characterized in that, the setting of connecting with said metal oxide varistor of said solenoid.
20. equipment according to claim 18; It is characterized in that; The setting of connecting with auxiliary switch of said solenoid and said metal oxide varistor, when said circuit interruption device was in tripped condition, said auxiliary switch suppressed circuit and said a plurality of line terminal decoupling zero with said voltage transient.
21. equipment according to claim 1; Wherein said metal oxide resistor can be under the situation that said metal oxide varistor breaks down conduct leakage current; Said failure detector circuit is configured to when said leakage current surpasses predetermined value, detect said leakage current, as said at least a fault state.
22. equipment according to claim 21, wherein when said equipment was in off state, said metal oxide resistor kept the difference coupling with respect to said sensor cluster.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/780,342 | 2010-05-14 | ||
| US12/780,342 US7965477B1 (en) | 2005-03-15 | 2010-05-14 | Protective device with improved surge protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202218000U true CN202218000U (en) | 2012-05-09 |
Family
ID=46019201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201549380U Expired - Fee Related CN202218000U (en) | 2010-05-14 | 2011-05-12 | Improved surge protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202218000U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106134025A (en) * | 2014-02-05 | 2016-11-16 | 希坡科技公司 | For electrically defence transient overvoltage with for monitoring the unit equipment of electrical system |
| CN107919661A (en) * | 2017-12-28 | 2018-04-17 | 浙江多格电气有限公司 | A kind of modular Surge Protector |
| CN111542980A (en) * | 2017-12-29 | 2020-08-14 | Abb瑞士股份有限公司 | Parametric-free identification of fault location in multi-terminal power transmission line |
| CN111542905A (en) * | 2017-12-01 | 2020-08-14 | 黑格尔电镀物品股份有限公司 | Modular power switching device |
| CN112352470A (en) * | 2018-06-28 | 2021-02-09 | 昕诺飞控股有限公司 | Circuit board arrangement for protection against overvoltages and arcs |
| CN108845204B (en) * | 2018-06-21 | 2021-02-26 | 浙江巨磁智能技术有限公司 | Power utilization equipment fault diagnosis system and diagnosis method thereof |
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2011
- 2011-05-12 CN CN2011201549380U patent/CN202218000U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106134025A (en) * | 2014-02-05 | 2016-11-16 | 希坡科技公司 | For electrically defence transient overvoltage with for monitoring the unit equipment of electrical system |
| CN106134025B (en) * | 2014-02-05 | 2019-10-11 | 希坡科技公司 | For electrically defending transient overvoltage and monitoring unit equipment, its operating method, the plug-in type box of electric utility |
| US10468874B2 (en) | 2014-02-05 | 2019-11-05 | Cirprotec, S.L. | Combined device for electrical protection against transient overvoltages and monitoring of an electrical installation |
| CN111542905A (en) * | 2017-12-01 | 2020-08-14 | 黑格尔电镀物品股份有限公司 | Modular power switching device |
| CN111542905B (en) * | 2017-12-01 | 2023-01-31 | 黑格尔电镀物品股份有限公司 | Modular power switching device |
| CN107919661A (en) * | 2017-12-28 | 2018-04-17 | 浙江多格电气有限公司 | A kind of modular Surge Protector |
| CN111542980A (en) * | 2017-12-29 | 2020-08-14 | Abb瑞士股份有限公司 | Parametric-free identification of fault location in multi-terminal power transmission line |
| CN111542980B (en) * | 2017-12-29 | 2021-06-15 | Abb电网瑞士股份公司 | Apparatus and method for identifying fault location in electric power transmission line |
| US11360137B2 (en) | 2017-12-29 | 2022-06-14 | Hitachi Energy Switzerland Ag | Parameter free identification of fault location in multi-terminal power transmission lines |
| CN108845204B (en) * | 2018-06-21 | 2021-02-26 | 浙江巨磁智能技术有限公司 | Power utilization equipment fault diagnosis system and diagnosis method thereof |
| CN112352470A (en) * | 2018-06-28 | 2021-02-09 | 昕诺飞控股有限公司 | Circuit board arrangement for protection against overvoltages and arcs |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120509 Termination date: 20130512 |