CN205753342U - Earth leakage protective device - Google Patents

Earth leakage protective device Download PDF

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Publication number
CN205753342U
CN205753342U CN201620741851.6U CN201620741851U CN205753342U CN 205753342 U CN205753342 U CN 205753342U CN 201620741851 U CN201620741851 U CN 201620741851U CN 205753342 U CN205753342 U CN 205753342U
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China
Prior art keywords
ground wire
trigger
circuit
sequence current
mutual inductor
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CN201620741851.6U
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Chinese (zh)
Inventor
毕大岩
韦瑞洪
陈敬祥
史泽华
刘睿刚
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AO Smith China Water Heater Co Ltd
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AO Smith China Water Heater Co Ltd
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Priority to CN2016103354736 priority Critical
Priority to CN201620457971 priority
Priority to CN201610335473 priority
Priority to CN2016204579713 priority
Application filed by AO Smith China Water Heater Co Ltd filed Critical AO Smith China Water Heater Co Ltd
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Abstract

The utility model discloses a kind of earth leakage protective device, comprising: be arranged on power end to the on-off system between the phase line of load end, zero line, ground wire;Ground wire electrification induction installation;Phase line, the indicating module of zero line electric connection with described power end;The outfan of described ground wire electrification induction installation is electrically connected with described indicating module, described on-off system;Described on-off system is when the signal of telecommunication that described ground wire electrification induction installation senses reaches first threshold, being converted to off-state by connected state, described indicating module sends lasting indication signal when the signal of telecommunication that described ground wire electrification induction installation senses reaches first threshold.Earth leakage protective device described in the utility model, is conducive to the analysis of causes and the failture evacuation of Electrical Safety while realizing power-off protection and persistently instruction function, and circuit structure own is simple, and cost is relatively low.

Description

Earth leakage protective device
Technical field
This utility model relates to safety technique for using electricity field, particularly to a kind of earth leakage protective device.
Background technology
At present, in order to ensure the Electrical Safety of user, it will usually arrange earthed system for every building building.Concrete, institute Stating the copper bar of the buried underground, one end of earthed system, the other end is coupled with in the socket earth polar jack of every household.Work as user When plug is inserted into this socket, the earth polar copper pin on plug is connected with socket earth polar jack, is now riveted on plug earth polar copper The PE yellowish green protection wire then metal parts palp with electrical equipment of pin, such as shell connect, and form a complete ground connection System.General, there are the I electric appliances of grounding requirement, such as refrigerator etc., are required for palp conductiving metal part and ground connection System connects, and allows it keep no-voltage, to ensure the personal safety of user.But once earthed system occurs abnormal, the most slotting Wiring error, socket or the unexpected factor such as circuit damage and short circuit occur on Zuo, is likely to make earthed system local the most charged. If user does not obtain power-off protection or prompting timely and is continuing with electrical equipment, then may cause electric shock casualty accident.
In prior art, in order to avoid the security incident occurred when earthed system exception, generally by setting in the line Put earth leakage protective device, it is simple to load end break down electric leakage or ground wire unexpected the most charged time, it is achieved power-off protection.But, mesh Front earth leakage protective device circuit structure on the whole is complex, relatively costly.
Utility model content
The purpose of this utility model is to provide a kind of simple earth leakage protective device of circuit structure, can to occurring because of ground wire therefore The analysis of causes and the failture evacuation of lasting instruction, beneficially Electrical Safety is made while trigger protection action during barrier electric current.
Above-mentioned purpose of the present utility model can use following technical proposal to realize:
A kind of earth leakage protective device, comprising:
It is arranged on power end to the on-off system between the phase line of load end, zero line, ground wire;
Ground wire electrification induction installation;
Phase line, the indicating module of zero line electric connection with described power end;
The outfan of described ground wire electrification induction installation is electrically connected with described indicating module, described on-off system;
Described on-off system is when the signal of telecommunication that described ground wire electrification induction installation senses reaches first threshold, by connecting State Transferring is off-state;The signal of telecommunication that described indicating module senses at described ground wire electrification induction installation reaches the first threshold Lasting indication signal is sent during value.
Further, described on-off system includes: dropout locker, described dropout locker include switching mechanism, Solenoid and control circuit;Wherein, described switching mechanism is arranged on power end between the phase line of load end, zero line, ground wire, Described control circuit is connected on the phase line between described switching mechanism and described load end, zero line;
Described ground wire electrification induction installation is ground wire zero sequence current mutual inductor, and it is negative with described that it is located in described switching mechanism Carry on the ground wire between end;
The outfan of described ground wire zero sequence current mutual inductor is electrically connected with described indicating module, described control circuit;
The telecommunications that the solenoid being electrically connected with described control circuit senses at described ground wire zero sequence current mutual inductor Number reach energising during first threshold, and then described switching mechanism is trip status by snap close State Transferring;Described indicating module exists The signal of telecommunication that described ground wire zero sequence current mutual inductor senses reaches to send during first threshold lasting indication signal.
Further, the load circuit zero sequence current mutual inductor being arranged between described switching mechanism and described load end, Phase line, zero line between described switching mechanism extremely described load end pass described load circuit zero sequence current mutual inductor in the same direction.
Further, described control circuit includes:
First rectification circuit, the first resistance, the first trigger element, the first amplifying circuit, wherein, described first amplifying circuit Input be connected with the outfan of load circuit zero sequence current mutual inductor.
Further, described first amplifying circuit is for the telecommunications detected by described load circuit zero sequence current mutual inductor Number it is amplified, comprising: first input end, the second input, the first outfan, wherein,
Described first input end, the second input are connected with the outfan of described load circuit zero sequence current mutual inductor;
Described first outfan is electrically connected with the trigger electrode of described first trigger element,
The solenoid being electrically connected with described first trigger element senses at described load circuit zero sequence current mutual inductor To the signal of telecommunication reach Second Threshold time energising, and then described switching mechanism is trip status by snap close State Transferring.
Further, described indicating module includes:
Second resistance, the second trigger element, indicator elment, photoelectrical coupler, wherein,
Described second resistance one end is connected with described second rectification circuit anode, the other end and described second trigger element Positive pole be connected;
The positive pole of described second trigger element is connected with described second resistance, its negative pole and the positive pole of described indicator elment Being connected, its trigger electrode is connected with the negative pole of output end of described photoelectrical coupler;
The positive pole of described indicator elment is connected with the negative pole of described second trigger element, its negative pole and described second rectification The negative pole of circuit is connected;
Described photoelectrical coupler input anode is connected with the second outfan of described second amplifying circuit, and its input is born Pole is electrically connected with the trigger electrode of described first trigger element, and its output head anode is connected with described second rectification circuit anode Connecing, its negative pole of output end is connected with the triggering end of described second trigger element.
Further, described indicating module also includes:
It is connected to the zener diode at described second rectification circuit two ends, filter capacitor.
Further, the form of described indicator elment include following in any one:
Light emitting diode, neon lamp, speaker.
Further, the form of described first trigger element or described second trigger element is controllable silicon.
Further, described ground wire zero sequence current mutual inductor or two outputs of described load circuit zero sequence current mutual inductor Regulation resistance it is parallel with between end.
The technical scheme provided from above the application embodiment, the application can pass through ground wire electrification induction installation Abnormal current on sensing ground wire, and the described signal of telecommunication sensed is flowed to on-off system and the instruction being electrically connected with therewith Module, on the one hand making described on-off system is trip status by snap close State Transferring, it is achieved power-off protection;On the other hand triggering is made Described indicating module sends lasting indication signal.Described indication signal one is triggered, and will maintain always, beneficially electricity consumption peace The full analysis of causes and failture evacuation, reduce the fault erroneous judgement caused because indication signal disappears.Relative to of the prior art For earth leakage protective device, it is while realizing power-off protection and persistently instruction function, and circuit structure own is simple, and cost is relatively Low.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of earth leakage protective device in a kind of embodiment of this utility model;
Fig. 2 is the circuit diagram of earth leakage protective device in this utility model another embodiment.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the technical solution of the utility model is elaborated, it should be understood that These embodiments are merely to illustrate this utility model rather than limit scope of the present utility model, new having read this practicality After type, those skilled in the art each fall within the application claims to the amendment of the various equivalent form of values of the present utility model In limited range.
This utility model provides a kind of simple earth leakage protective device of circuit structure, can to because of ground wire break down electric current time Make lasting instruction while trigger protection action, and indication signal be not by ground wire whether charging effect, with facilitate eliminating and Analyze power failure.
It should be noted that when element is referred to as " being arranged at " another element, and it can be directly on another element Or element placed in the middle can also be there is.When an element is considered as " connection " another element, and it can be to be directly connected to To another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " on ", For illustrative purposes only, being not offered as is unique embodiment for D score, "left", "right" and similar statement.
Referring to Fig. 1, the earth leakage protective device provided in the application embodiment may include that and is arranged on power end to negative Carry the on-off system between the phase line (4,5) of end, zero line (6,7), ground wire (8,9);Ground wire electrification induction installation;With described power supply The indicating module 28 that the phase line 6 of end, zero line 8 are electrically connected with;The outfan of described ground wire electrification induction installation and described instruction mould Block 28, described on-off system are electrically connected with;When the signal of telecommunication that described ground wire electrification induction installation senses reaches first threshold, Trigger described on-off system and be converted to off-state by connected state, and trigger described indicating module 28 and send lasting instruction letter Number.
Earth leakage protective device described herein, by the abnormal current on ground wire electrification induction installation sensing ground wire 5, and The described signal of telecommunication sensed is flowed to on-off system and the indicating module 28 being electrically connected with therewith, on the one hand makes described break-make Device is trip status by snap close State Transferring, it is achieved power-off protection;On the other hand make the described indicating module of triggering 28 send to hold Continuous indication signal.Described indication signal one is triggered, and will maintain always, beneficially the analysis of causes of Electrical Safety and fault Get rid of, reduce the fault erroneous judgement caused because indication signal disappears.For earth leakage protective device of the prior art, its While realizing power-off protection and persistently instruction function, circuit structure own is simple, and cost is relatively low.
In one embodiment, described on-off system is specifically as follows dropout locker, and it can include switching on and shutting down Structure, solenoid 29 and control circuit 30;Wherein, described switching mechanism be arranged on power end to load end phase line (4,5), zero Between line (6,7), ground wire (8,9), described control circuit 30 is connected to the phase line between described switching mechanism and described load end 7, on zero line 9;Described ground wire electrification induction installation can be ground wire zero sequence current mutual inductor 15, its be located in described switching mechanism with On ground wire 5 between described load end;The outfan of described ground wire zero sequence current mutual inductor 15 and described indicating module 28, described Control circuit 30 is electrically connected with;With described control circuit 30 be electrically connected with solenoid at described ground wire zero sequence current mutual inductor 15 signals of telecommunication sensed reach energising during first threshold, and then described switching mechanism is trip status by snap close State Transferring; Described indicating module 28 sends when the signal of telecommunication that described ground wire zero sequence current mutual inductor 15 senses reaches first threshold and continues Indication signal.
In the present embodiment, described ground wire electrification induction installation is for sensing the abnormal current in ground wire, concrete, institute Stating ground wire electrification induction installation can be ground wire zero sequence current mutual inductor 15, and certainly, it can also be other forms, and the application exists This does not make concrete restriction.Described ground wire zero sequence current mutual inductor 15 can be located in described switching mechanism and described load end Between on ground wire 5.
In the present embodiment, described indicating module 28 can be electrically connected at described power end and described switching mechanism it Between phase line 6, on zero line 8;The outfan of described ground wire zero sequence current mutual inductor 15 and described indicating module 28, described control electricity Road 30 is electrically connected with.When the signal of telecommunication that described ground wire zero sequence current mutual inductor 15 senses reaches first threshold, trigger described Control circuit 30 is so that described solenoid 29 is energized, and then to make described switching mechanism be trip status by snap close State Transferring; And trigger described indicating module 28 and send lasting indication signal.
In the present embodiment, described dropout locker may include that switching mechanism, solenoid 29 and control circuit 30.Wherein, described switching mechanism is arranged on power end between the phase line (4,5) of load end, zero line (6,7), ground wire (8,9). Wherein switching mechanism described in power end can include power end ground wire contact 1-1, load end ground wire contact 1-2, power end phase line Contact 2-1, load end phase line contact 2-2, power end zero line contact 3-1, load end zero line contact 3-2.Described switching mechanism is also Including the reset push rod being connected with described load end contact and the spring being connected with described reset push rod.Described spring One end be connected with described reset push rod, the other end is connected with described solenoid 29, when described solenoid 29 is charged After, described spring drives described reset push rod to move, it is achieved described load end contact is threaded off mutually with power end contact.
In the present embodiment, described ground wire zero sequence current mutual inductor 15 is located in described switching mechanism and described load end Between on ground wire 5, for sensing whether described power end has abnormal current to the ground wire of load end.When described ground wire zero sequence electricity When the signal of telecommunication that current transformer 15 senses reaches first threshold, it can trigger connected control circuit 30, instruction mould Corresponding trigger element in block 28.Wherein, the size of described first threshold can be according to the concrete form of trigger element in circuit Making corresponding setting, the application does not make concrete restriction at this.Such as, when in described control circuit 30, indicating module 28 When trigger element is silicon controlled form, the size of described first threshold can with the identical of described silicon controlled trigger current or Corresponding.Under a concrete scene, when described first threshold is identical with described silicon controlled trigger current, if describedly The current signal that line zero sequence current mutual inductor 15 senses is more than or equal to described silicon controlled trigger current, the most described controllable silicon energy Enough conductings.
In the present embodiment, described control circuit 30 is connected to the phase line between described switching mechanism and described load end 7, on zero line 9.Described control circuit 30 is electrically connected with, when described ground wire with the outfan of described ground wire zero sequence current mutual inductor 15 When the signal of telecommunication that zero sequence current mutual inductor 15 senses reaches first threshold, trigger described control circuit 30 so that described electromagnetic wire Circle 29 energising, and then to make described switching mechanism be trip status by snap close State Transferring, it is achieved power-off protection.
In the present embodiment, described indicating module 28 is electrically connected between described power end and described switching mechanism On phase line 6, zero line 8, described power end can be to described indicating module 28 continued power.Described indicating module 28 and described ground wire The outfan of zero sequence current mutual inductor 15 is electrically connected with, and the signal of telecommunication sensed when described ground wire zero sequence current mutual inductor 15 reaches During first threshold, trigger described indicating module 28 and send lasting indication signal.
Earth leakage protective device described herein, by being located between described switching mechanism and described load end on ground wire Ground wire zero sequence current mutual inductor 15 sense the abnormal current on ground wire 5, and the described signal of telecommunication sensed is flowed to therewith The control circuit 30 being electrically connected with and indicating module 28, on the one hand make the solenoid 29 of described control circuit 30 be energized, and then Making described switching mechanism is trip status by snap close State Transferring, it is achieved power-off protection;On the other hand triggering described instruction mould is made Block 28 sends lasting indication signal.Described indication signal one is triggered, and will maintain always, beneficially the reason of Electrical Safety Analyze and failture evacuation, reduce the fault erroneous judgement caused because indication signal disappears.Relative to earth leakage protective of the prior art For device, it is while realizing power-off protection and persistently instruction function, and circuit structure own is simple, and cost is relatively low.
In one embodiment, described earth leakage protective device can also include: is arranged on described switching mechanism with described Load circuit zero sequence current mutual inductor 14 between load end, the phase line 7 between described switching mechanism to described load end, zero line 9 in the same direction through described load circuit zero sequence current mutual inductor 14.
In the present embodiment, for sensing whether have abnormal current between phase line 7 between described load end, zero line 9. When the signal of telecommunication that described load circuit zero sequence current mutual inductor 14 senses reaches Second Threshold, described can trigger and its electricity Property connect control circuit 30 in corresponding trigger element.Wherein, the size of described Second Threshold can be according to control circuit 30 The concrete form of middle trigger element makees corresponding setting, and the application does not make concrete restriction at this.Such as, electricity is controlled when described When trigger element in road 30 is silicon controlled form, the size of described Second Threshold can be with described silicon controlled trigger current Identical or corresponding.Under a concrete scene, when described Second Threshold is identical with described silicon controlled trigger current, If the current signal that described load circuit zero sequence current mutual inductor senses is more than or equal to described silicon controlled trigger current, then institute State controllable silicon can turn on.
In one embodiment, described control circuit 30 may include that first rectification circuit the 31, first resistance 10, One trigger element the 11, first amplifying circuit 13, wherein, the input of described first amplifying circuit 13 and load circuit zero-sequence current The outfan of transformer 14 is connected.
In the present embodiment, described first rectification circuit 31 for by the phase line 7 between described load end, zero line 9 it Between flow into alternating current be converted to unidirectional current.Wherein, the form of described first rectification circuit 31 can be bridge full-wave rectifier electricity Road.Described full-wave bridge rectifier circuit specifically can be made up of four diodes.Certainly, described first rectification circuit 31 is concrete Form is not limited to foregoing description, and one of ordinary skill in the art are under the technical spirit of the application is enlightened, it is also possible to make other Change, but as long as its realize function same as the present application with effect or similar, all should be covered by the application protection domain.
Referring to Fig. 2, in another specific embodiment, the form of described first rectification circuit 31 can be that half-wave is whole Current circuit, it specifically can be made up of a diode.Certainly, on the concrete form of described first rectification circuit 31 is not limited to Stating description, one of ordinary skill in the art are under the technical spirit of the application is enlightened, it is also possible to make other change, but as long as its The function realized is same as the present application with effect or similar, all should be covered by the application protection domain.
In the present embodiment, the electricity that described first trigger element 11 senses at described ground wire zero sequence current mutual inductor 15 The signal of telecommunication sensed when signal reaches first threshold or at described load circuit zero sequence current mutual inductor 14 reaches the second threshold During value, it can be triggered, so that described solenoid obtains electric, and then makes the described switching mechanism by snap close State Transferring be Trip status, it is achieved power-off protection.Wherein, the form of described first trigger element 11 can be silicon controlled form.Certainly, institute The form stating the first trigger element 11 is not limited to foregoing description, and one of ordinary skill in the art enlighten in the technical spirit of the application Under, it is also possible to make other change, but as long as its function realized is same as the present application with effect or similar, all should be covered by In the application protection domain.
In a specific embodiment, described first amplifying circuit 13 is for by mutual for described load circuit zero-sequence current The signal of telecommunication that sensor 14 detects is amplified, comprising: first input end, the second input, the first outfan, wherein, institute State first input end, the second input is connected with the outfan of described load circuit zero sequence current mutual inductor 14;Described first Outfan is electrically connected with the trigger electrode of described first trigger element 11, when described load circuit zero sequence current mutual inductor sense 14 should To the signal of telecommunication reach Second Threshold time, trigger described first trigger element 11 so that described solenoid 29 is energized, and then make Described switching mechanism is trip status by snap close State Transferring.
In the present embodiment, described first amplifying circuit 13 can increase electrical signal amplitude or power.Concrete, when logical Cross after the signal of telecommunication that described load circuit zero sequence current mutual inductor 14 detects is amplified by described first amplifying circuit 13, institute State the signal of telecommunication that load circuit zero sequence current mutual inductor 14 detects corresponding with the trigger current of described first trigger element 11. The size of the trigger current of the most described first trigger element 11 can be that described load circuit zero sequence current mutual inductor 14 detects The prearranged multiple of the electric current arrived.Described prearranged multiple is the amplification of described first amplifying circuit 13.
In the present embodiment, the core parts of described first amplifying circuit 13 are electronic active device, such as electron tube, crystalline substance Body pipe etc..By described first rectification circuit the 31, first resistance 10, the alternating current that described load end provides is converted to voltage stabilizing straight Stream electricity, thus provide DC source for described first amplifying circuit 13.
In one embodiment, described earth leakage protective device can also include: for by mutual for described ground wire zero-sequence current The second amplifying circuit 16 that the signal of telecommunication that sensor 15 senses is amplified, it include the 3rd input, four-input terminal, second Outfan, wherein, described 3rd input, four-input terminal are connected with the outfan of described ground wire zero sequence current mutual inductor 15 Connect;Described second outfan is electrically connected with described indicating module 28, control circuit 30.
In the present embodiment, described second amplifying circuit 16 can increase electrical signal amplitude or power.Concrete, when logical Cross after the signal of telecommunication that described ground wire zero sequence current mutual inductor 15 detects is amplified by described second amplifying circuit 16, describedly The signal of telecommunication that line zero sequence current mutual inductor 15 detects and the triggering in described first trigger element 11 or described indicating module 30 The trigger current of unit is corresponding.The triggering of the trigger element in the most described first trigger element 11 or described indicating module 30 The size of electric current is corresponding.Such as, the triggering electricity of the trigger element in described first trigger element 11 or described indicating module 30 The size of stream can be the prearranged multiple of the electric current that described ground wire zero sequence current mutual inductor 15 detects.Described prearranged multiple can be The amplification of described second amplifying circuit 16.
In the present embodiment, the core parts of described second amplifying circuit 16 are electronic active device, such as electron tube, crystalline substance Body pipe etc..By described first rectification circuit the 31, first resistance 10, the alternating current that described load end provides is converted to voltage stabilizing straight Stream electricity, thus provide DC source for described second amplifying circuit 16.
The concrete form of described second amplifying circuit 16 can be that special earth leakage protective integrated circuit can also be for other letters Single triggering circuit, or can also be other forms, the application does not make concrete restriction at this.
Referring to Fig. 2, in another specific embodiment, described second amplifying circuit 16 can include that the 3rd triggering is single Unit 32 and the 6th resistance 33.The form of described 3rd trigger element 32 can be with silicon controlled form.
When specifically connecting, two outfans of described ground wire zero sequence current mutual inductor 15 connect the 3rd trigger element 32 respectively Trigger electrode and one end of the 6th resistance 33, the negative pole of the 3rd trigger element 32 connects the other end and the instruction mould of the 6th resistance 33 Block 28.
In one embodiment, described indicating module 28 may include that and is connected to described power end to institute's switching mechanism Between phase line 6, the second resistance 26 and the second rectification circuit 27 on zero line 8.
In the present embodiment, described second resistance 26 coordinates with described second rectification circuit 27 for by described power end The alternating current that phase line 6, zero line 8 provide is converted to direct current of voltage regulation.
Wherein, the form of described second rectification circuit 27 can be full-wave bridge rectifier circuit.Described bridge full-wave rectifier Circuit specifically can be made up of four diodes.Certainly, the concrete form of described second rectification circuit 27 is not limited to above-mentioned retouching Stating, one of ordinary skill in the art are under the technical spirit of the application is enlightened, it is also possible to make other change, but as long as it realizes Function same as the present application with effect or similar, all should be covered by the application protection domain.
Referring to Fig. 2, in another specific embodiment, the form of described second rectification circuit 27 can be that half-wave is whole Current circuit, it specifically can be made up of a diode.Certainly, on the concrete form of described second rectification circuit 27 is not limited to Stating description, one of ordinary skill in the art are under the technical spirit of the application is enlightened, it is also possible to make other change, but as long as its The function realized is same as the present application with effect or similar, all should be covered by the application protection domain.
In one embodiment, described indicating module 28 may include that the second resistance 26, the second trigger element 21, refers to Show element 23, photoelectrical coupler 19.Wherein, described second resistance 26 one end is connected with described second rectification circuit 27 positive pole, The other end is connected with the positive pole of described second trigger element 21;The positive pole of described second trigger element 21 and described second resistance 26 are connected, and its negative pole is connected with the positive pole of described indicator elment 23, its trigger electrode and the output of described photoelectrical coupler 19 End negative pole is connected;The positive pole of described indicator elment 23 is connected with the negative pole of described second trigger element 21, its negative pole and institute The negative pole stating the second rectification circuit 27 is connected;Described photoelectrical coupler 19 input anode and described second amplifying circuit 16 Second outfan connects, and its input cathode is electrically connected with the trigger electrode of described first trigger element 11, its output head anode Being connected with described second rectification circuit 27 positive pole, its negative pole of output end is connected with the triggering end of described second trigger element 21 Connect.
In the present embodiment, photoelectrical coupler 19 (OC optical coupler) is also known as photoisolator, is called for short light Coupling.Electric light one power conversion device of one that photoelectrical coupler 19 is is the media transmission signal of telecommunication with light.It is by luminous source and is subject to Light device two parts form.Described luminous source and light-receiving device are assembled in same airtight housing, to each other with transparent insulator every From.The pin of luminous source is input, and the pin of light-receiving device is outfan.Common luminous source is light emitting diode, light-receiving device For light sensitive diode, phototriode etc..Photo-coupler 19 is with light for the media transmission signal of telecommunication, and it is to input, output telecommunications Number having good buffer action, it can utilize the signal of telecommunication driven for emitting lights source of input, is allowed to send the light of certain wavelength, by light Device receives and produces photoelectric current, then exports after amplifying further.
When the signal of telecommunication that described ground wire zero sequence current mutual inductor 15 senses reaches first threshold, with described ground wire zero sequence The described photoelectrical coupler 19 that current transformer 15 connects receives this signal of telecommunication, thus triggers described photoelectrical coupler 19 and export Electric current, when this electric current reaches the trigger current of described second trigger element 21, described second trigger element 21 is connected, and then is made Obtain described indicator elment 23 and obtain electric, indicate.
In one embodiment, the form of described indicator elment 23 include following in any one: light emitting diode, neon Lamp, speaker.
Concrete, described indicator elment 23 can be light-emitting component, can be that sounding component can also be for other forms Instruction form, the application does not make concrete restriction at this.
In one embodiment, the form of described second trigger element 21 can be silicon controlled form.Certainly, described The form of the second trigger element 21 is not limited to foregoing description, and one of ordinary skill in the art enlighten in the technical spirit of the application Under, it is also possible to make other change, but as long as its function realized is same as the present application with effect or similar, all should be covered by In the application protection domain.
In one embodiment, described indicating module 28 can also include: is connected to described second rectification circuit 27 liang The zener diode 25 of end, filter capacitor 24.
Wherein, described zener diode 25 has before reverse energising not yet punctures, and the voltage at its two ends is held essentially constant Characteristic.After Zener diode 25 is accessed circuit, if owing to supply voltage fluctuates, or other reason causes circuit During middle each point variation in voltage, the voltage at load two ends will be held essentially constant.
In the present embodiment, one end of described zener diode 25 is connected with the positive pole of described two rectification circuits 27, The other end is connected with the negative pole of described two rectification circuits 27.
Described filter capacitor 24 is for being used for being arranged on rectification circuit two ends in order to reduce AC ripple ripple coefficient lifting height A kind of energy storage device of effect smooth direct current output.
In the present embodiment, one end of described filter capacitor 24 is connected, separately with the positive pole of described two rectification circuits 27 One end is connected with the negative pole of described two rectification circuits 27.
In one embodiment, described control circuit 30 can also include: first diode the 12, second diode 17.
In the present embodiment, described first diode the 12, second diode 17 be arranged on described first amplifying circuit 13, The outfan of the second amplifying circuit 16 is between described first trigger element 11, for realizing from described amplifying circuit to the most described the The one-way conduction of one trigger element 11.
Concrete, the positive pole of described first diode 12 is connected with the first outfan of described first amplifying circuit 13, Its negative pole is for being connected with the trigger electrode of described first trigger element 11.The positive pole and described second of described second diode 17 Second outfan of amplifying circuit 16 is connected, and its negative pole is for being connected with the trigger electrode of described first trigger element 11.
In one embodiment, described indicating module 28 can also include the 3rd resistance 20.Concrete, described 3rd electricity One end of resistance 20 is connected with the negative pole of output end of described photoelectrical coupler 19, the other end and the negative pole of described second rectification circuit 27 It is connected.
In one embodiment, described control circuit 30 can also include the 4th resistance 18.Concrete, described 4th electricity One end of resistance 18 is connected with the light emitting diode negative pole of photoelectrical coupler 19, the other end and described ground wire zero sequence current mutual inductor 15 Outfan be connected.
In one embodiment, described ground wire zero sequence current mutual inductor 15 or described load circuit zero sequence current mutual inductor It is parallel with regulation resistance between two outfans of 16.
In the present embodiment, described regulation resistance is to described ground wire zero sequence current mutual inductor 15 or described load circuit zero Sequence current transformer 16 shunts, and to regulate the tripping voltage between zero line, ground wire, improves the practicality of this earth leakage protective device Property.
In one embodiment, it is additionally provided with test loop between the phase line 7 of described load end, zero line 9.Described test Loop is when test has abnormal current between load end phase line 7, zero line 9, and can described trip gear normally thread off.Specifically , described test loop includes: the first test resistance that one end is connected with phase line 7;One end is connected with described first test resistance, The other end by with the shift knob being conductively connected;This wire is fed through described load circuit zero sequence current mutual inductor 14 and connects On zero line 9;The second test resistance that one end is connected with described phase line 6, its other end is connected on described zero line 9.
Herein described earth leakage protective device work process is as described below.
When abnormal current occurs in ground wire, described ground wire zero sequence current mutual inductor 15 can produce faradic current, this electric current After the second amplifying circuit 16 amplifies, after the photoelectrical coupler 19 of indicating circuit 28, on the one hand from this photoelectrical coupler The trigger electrode of the negative pole of output end of 19 to the second trigger element 21, makes described second trigger element 21 turn on, and then makes therewith The indicator elment 23 connected sends instruction;On the other hand from the input cathode of this photoelectrical coupler 19 to the first trigger element 11 so that described solenoid 29 obtains electric, and then described switching mechanism is threaded off, it is achieved power-off protection.
When having abnormal current between phase line and zero line, described load circuit zero sequence current mutual inductor 14 can produce sensing Electric current, this electric current, after the first amplifying circuit 13, exports to described first trigger element 11 so that described solenoid 29 Electricity, and then described switching mechanism is threaded off, it is achieved power-off protection.
There is abnormal current relative to there being exception between phase line and zero line for ground wire in herein described earth leakage protective device The situation of electric current, can to because of ground wire break down electric current time trigger protection action while make lasting instruction, and instruction letter Number once sending, will maintain, beneficially the analysis of causes of Electrical Safety and failture evacuation, reduce because indication signal disappears always And the fault erroneous judgement caused.
Each embodiment above-mentioned in this specification all uses the mode gone forward one by one to describe, identical between each embodiment Similar portion is cross-referenced, and what each embodiment stressed is and other embodiment differences.
The foregoing is only several embodiment of the present utility model, although the embodiment disclosed by this utility model is such as On, but described content is only to facilitate the embodiment that understands this utility model and use, is not intended to limit this practicality new Type.Any this utility model person of ordinary skill in the field, without departing from the spirit and scope disclosed by this utility model On the premise of, any amendment and change and can be made in details at embodiment in form, but patent of the present utility model Protection domain, still must be defined in the range of standard with appended claims.

Claims (12)

1. an earth leakage protective device, it is characterised in that including:
It is arranged on power end to the on-off system between the phase line of load end, zero line, ground wire;
Ground wire electrification induction installation;
Phase line, the indicating module of zero line electric connection with described power end;
The outfan of described ground wire electrification induction installation is electrically connected with described indicating module, described on-off system;
Described on-off system is when the signal of telecommunication that described ground wire electrification induction installation senses reaches first threshold, by connected state Be converted to off-state;Described indicating module is when the signal of telecommunication that described ground wire electrification induction installation senses reaches first threshold Send lasting indication signal.
2. earth leakage protective device as claimed in claim 1, it is characterised in that described on-off system is dropout locker,
Described dropout locker includes switching mechanism, solenoid and control circuit;Wherein, described switching mechanism is arranged on electricity Source between the phase line of load end, zero line, ground wire, described control circuit be connected to described switching mechanism and described load end it Between phase line, on zero line;
Described ground wire electrification induction installation is ground wire zero sequence current mutual inductor, and it is located in described switching mechanism and described load end Between ground wire on;The outfan of described ground wire zero sequence current mutual inductor electrically connects with described indicating module, described control circuit Connect;
The signal of telecommunication that the solenoid being electrically connected with described control circuit senses at described ground wire zero sequence current mutual inductor reaches It is energized to during first threshold, and then described switching mechanism is trip status by snap close State Transferring;Described indicating module is described The signal of telecommunication that ground wire zero sequence current mutual inductor senses reaches to send during first threshold lasting indication signal.
3. earth leakage protective device as claimed in claim 2, it is characterised in that also include: be arranged on described switching mechanism and institute State the load circuit zero sequence current mutual inductor between load end, the phase line between described switching mechanism to described load end, zero line In the same direction through described load circuit zero sequence current mutual inductor.
4. earth leakage protective device as claimed in claim 3, it is characterised in that described control circuit includes:
First rectification circuit, the first resistance, the first trigger element, the first amplifying circuit, wherein, described first amplifying circuit defeated Enter end to be connected with the outfan of load circuit zero sequence current mutual inductor.
5. earth leakage protective device as claimed in claim 4, it is characterised in that: described first amplifying circuit is for by described load The signal of telecommunication that loop zero sequence current mutual inductor detects is amplified, comprising: first input end, the second input, first defeated Go out to hold, wherein,
Described first input end, the second input are connected with the outfan of described load circuit zero sequence current mutual inductor;
Described first outfan is electrically connected with the trigger electrode of described first trigger element,
The solenoid being electrically connected with described first trigger element senses at described load circuit zero sequence current mutual inductor The signal of telecommunication reaches energising during Second Threshold, and then described switching mechanism is trip status by snap close State Transferring.
6. earth leakage protective device as claimed in claim 4, it is characterised in that also include: for by described ground wire zero-sequence current Transformer induced to the second amplifying circuit of being amplified of the signal of telecommunication, it includes the 3rd input, four-input terminal, second defeated Go out to hold, wherein,
Described 3rd input, four-input terminal are connected with the outfan of described ground wire zero sequence current mutual inductor;
Described second outfan is electrically connected with described indicating module, control circuit.
7. earth leakage protective device as claimed in claim 6, it is characterised in that described indicating module includes:
It is connected to described power end to the phase line between institute's switching mechanism, the second resistance on zero line and the second rectification circuit.
8. earth leakage protective device as claimed in claim 7, it is characterised in that described indicating module includes:
Second resistance, the second trigger element, indicator elment, photoelectrical coupler, wherein,
Described second resistance one end is connected with described second rectification circuit anode, and the other end is with described second trigger element just Pole is connected;
The positive pole of described second trigger element is connected with described second resistance, and its negative pole is connected with the positive pole of described indicator elment Connecing, its trigger electrode is connected with the negative pole of output end of described photoelectrical coupler;
The positive pole of described indicator elment is connected with the negative pole of described second trigger element, its negative pole and described second rectification circuit Negative pole be connected;
Described photoelectrical coupler input anode is connected with the second outfan of described second amplifying circuit, its input cathode with The trigger electrode of described first trigger element is electrically connected with, and its output head anode is connected with described second rectification circuit anode, its Negative pole of output end is connected with the triggering end of described second trigger element.
9. earth leakage protective device as claimed in claim 8, it is characterised in that described indicating module also includes:
It is connected to the zener diode at described second rectification circuit two ends, filter capacitor.
10. earth leakage protective device as claimed in claim 8, it is characterised in that the form of described indicator elment include following in Any one:
Light emitting diode, neon lamp, speaker.
11. earth leakage protective devices as claimed in claim 8, it is characterised in that
The form of described first trigger element or described second trigger element is controllable silicon.
12. earth leakage protective devices as claimed in claim 3, it is characterised in that described ground wire zero sequence current mutual inductor or described It is parallel with regulation resistance between two outfans of load circuit zero sequence current mutual inductor.
CN201620741851.6U 2016-05-19 2016-07-14 Earth leakage protective device Active CN205753342U (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN2016103354736 2016-05-19
CN201620457971 2016-05-19
CN201610335473 2016-05-19
CN2016204579713 2016-05-19

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106602500A (en) * 2017-01-04 2017-04-26 郝珊 Novel protection grounding live-line alarm and protection circuit
CN108134369A (en) * 2018-01-23 2018-06-08 余姚市嘉荣电子电器有限公司 A kind of earth leakage protective device
CN108134368A (en) * 2018-01-23 2018-06-08 余姚市嘉荣电子电器有限公司 A kind of earth leakage protective device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106602500A (en) * 2017-01-04 2017-04-26 郝珊 Novel protection grounding live-line alarm and protection circuit
CN108134369A (en) * 2018-01-23 2018-06-08 余姚市嘉荣电子电器有限公司 A kind of earth leakage protective device
CN108134368A (en) * 2018-01-23 2018-06-08 余姚市嘉荣电子电器有限公司 A kind of earth leakage protective device

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