CN102324717B - Leakage protection device - Google Patents

Leakage protection device Download PDF

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CN102324717B
CN102324717B CN 201110292740 CN201110292740A CN102324717B CN 102324717 B CN102324717 B CN 102324717B CN 201110292740 CN201110292740 CN 201110292740 CN 201110292740 A CN201110292740 A CN 201110292740A CN 102324717 B CN102324717 B CN 102324717B
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connects
resistance
circuit
power
diode
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CN102324717A (en
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刘睿刚
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刘睿刚
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Abstract

The invention discloses a leakage protection device which can prevent the electric shock accidents caused by the fault of electrical appliances at the load end, but also can prevent the electric shock accidents caused by the fault of power sources with electric shock hazards. The leakage protection device comprises a zero-sequence current transformer, a test loop and an unlocking and locking device; an electromagnetic coil and a control circuit of the electromagnetic coil are arranged in the unlocking and locking device; a control circuit and an electromagnetic coil are connected between the phase line and the null line of a power source terminal; and a ground wire detecting circuit is connected among the null line, a ground wire and the control circuit.

Description

A kind of earth leakage protective device
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to earth leakage protective a kind of earth leakage protective device.
Background technology
Existing all-powerful leakage protection device can detect between load end phase line and the zero line and have or not residual current, and (for example: 10mA), it will be threaded off immediately, cuts off phase line, zero line and ground wire when occurring residual current between phase, the zero line and reaching the threshold values that presets; (for example: 10mA), it also can be threaded off immediately, cuts off phase line, zero line and ground wire when ground wire unexpected electric current occurs and reaches the threshold values that presets.Thereby, can make people and animals avoid being subject to the injury of excessive residual current and the unexpected electric current of ground wire.
Although existing all-powerful leakage protection device can be realized above-mentioned creepage protection function,, leakage protection circuit can be worked, correct power supply must be provided.In case power end breaks down (as: phase line or zero line are unexpected to be disconnected, or power end phase line and ground wire reversal connection), causing does not have current supply circuit, and the defencive function of all-purpose leakage protection plug just lost efficacy.At this moment, if just in case the situation (as: having produced the residual current or the unexpected electric current of ground wire that reach pre-set threshold value) of phase line electric leakage or ground protection system disappearance occurred, will be very dangerous.
Summary of the invention
The object of the present invention is to provide a kind of earth leakage protective device that can overcome above-mentioned existing earth leakage protective device defective, it not only can occur on load end phase, zero line road can all disconnect phase line contact, zero line contact and ground wire contact in time when electric leakage or ground wire accident are charged; And can also be when zero line disconnection or phase line disconnection appear in power end; just can automatically thread off; disconnect dangerous trouble power; and when the ground protection system ground connection disappearance (for example: the virtual connection of socket ground wire causes without ground connection) and the electric leakage of leakage protecting plug load end consuming device occur and causes on the electric appliance casing band dangerous voltage; or ground protection system abnormal is when causing ground tape dangerous voltage; also can automatically thread off; disconnect dangerous trouble power; in time get rid of potential danger, for people provide more reliable leakage protecting plug and Electrical Safety guarantee.
Technical solution proposed by the invention is as follows:
A kind of earth leakage protective device; comprise shell; the phase line 6 of power end; zero line 5; ground wire 7; the zero sequence current mutual inductor 18 that phase line 9 and the zero line 8 of load end all passes; the test loop; ground line detection circuit 32; thread off and locker; this dropout and locker comprise solenoid 11 and control circuit 33; contact; spring; push rod resets; described control circuit 33 is mainly by rectification circuit 13; controllable silicon 14; amplifying circuit 17 forms; be connected with solenoid 11 and control circuit 33 between the phase line 6 of described power end and the zero line 5, the zero line 5 of described power end; be connected with ground line detection circuit 32 between ground wire 7 and the control circuit 33.
When described control circuit 33 by current-limiting resistance 12, rectification circuit 13, controllable silicon 14, dropping resistor 15, when amplifying circuit 17 and the 1st diode 16 form, the phase line 6 of power end connects an end of current-limiting resistance 12, the other end of current-limiting resistance 12 connects an input of rectification circuit 13, another input of rectification circuit 13 connects power end zero line 5, the output head anode of rectification circuit 13 connects anode and an end of solenoid 11 and an end of dropping resistor 15 of controllable silicon 14, the negative pole of output end of rectification circuit 13 connects negative electrode and the other end of solenoid 11 and the power end negative pole of amplifying circuit 17 of controllable silicon 14, the anodal other end that connects dropping resistor 15 of the power end of amplifying circuit 17, the signal output part of amplifying circuit 17 connects the anode of the 1st diode 16, the negative electrode of the 1st diode 16 connects the trigger electrode of controllable silicon 14, and the two ends of the secondary output of zero sequence current mutual inductor 18 connect respectively the two ends of amplifying circuit 17 inputs.
When described control circuit 33 by current-limiting resistance 12, rectification circuit 13, controllable silicon 14, dropping resistor 15, when amplifying circuit 17 and the 1st diode 16 form, the phase line 6 of power end connects an end of current-limiting resistance 12, the other end of current-limiting resistance 12 connects input of rectification circuit 13 and an end of solenoid 11, another input of rectification circuit 13 connects the other end of power end zero line 5 and solenoid 11, the output head anode of rectification circuit 13 connects the anode of controllable silicon 14 and an end of dropping resistor 15, the negative pole of output end of rectification circuit 13 connects the negative electrode of controllable silicon 14 and the power end negative pole of amplifying circuit 17, the anodal other end that connects dropping resistor 15 of the power end of amplifying circuit 17, the signal output part of amplifying circuit 17 connects the anode of the 1st diode 16, the negative electrode of the 1st diode 16 connects the trigger electrode of controllable silicon 14, and the two ends of the secondary output of zero sequence current mutual inductor 18 connect respectively the two ends of amplifying circuit 17 inputs.
When described control circuit 33 by current-limiting resistance 12, rectifier diode 30, controllable silicon 14, dropping resistor 15, when amplifying circuit 17 and the 1st diode 16 form, the phase line 6 of power end connects an end of current-limiting resistance 12, the other end of current-limiting resistance 12 connects the anode of rectifier diode 30, the negative electrode of rectifier diode 30 connects an end and the anode of controllable silicon 14 and an end of dropping resistor 15 of solenoid 11, power end zero line 5 connects the other end and the negative electrode of controllable silicon 14 and the power end negative pole of amplifying circuit 17 of solenoid 11, the anodal other end that connects dropping resistor 15 of the power end of amplifying circuit 17, the signal output part of amplifying circuit 17 connects the anode of the 1st diode 16, the negative electrode of the 1st diode 16 connects the trigger electrode of controllable silicon 14, and the two ends of the secondary output of zero sequence current mutual inductor 18 connect respectively the two ends of amplifying circuit 17 inputs.
When described ground line detection circuit 32 by the 1st resistance 19, voltage stabilizing didoe 20, electric capacity 21, voltage comparator circuit 31, photoelectrical coupler 27 and the 2nd resistance 28 form, described voltage comparator circuit 31 is by the 2nd diode 22, the 3rd resistance 23, operational amplification circuit 24, when the 4th resistance 29 and light-emitting diode 25 form, power end zero line 5 connects an end of the 1st resistance 19 and anode and the negative electrode of electric capacity 21 and the power end negative pole of operational amplification circuit 24 of voltage stabilizing didoe 20, the output head anode of rectification circuit 13 connects the other end of the 1st resistance 19 and negative electrode and the anode of electric capacity 21 and power end positive pole and the in-phase input end of operational amplification circuit 24 and an end of the 4th resistance 29 of operational amplification circuit 24 of voltage stabilizing didoe 20, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the inverting input of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the negative electrode of the output connecting luminous diode 25 of operational amplification circuit 24, the other end of the 4th resistance 29 connects the luminous tube anode of photoelectrical coupler 27, the anode of the luminous tube negative electrode connecting luminous diode 25 of photoelectrical coupler 27, the phototriode collector electrode of photoelectrical coupler 27 connects the power end positive pole of amplifying circuit 17, the phototriode emitter of photoelectrical coupler 27 connects the trigger electrode of controllable silicon 14 and an end of the 2nd resistance 28, and the other end of the 2nd resistance 28 connects the negative pole of output end of rectification circuit 13.
When described ground line detection circuit 32 by the 1st resistance 19, voltage stabilizing didoe 20, electric capacity 21, voltage comparator circuit 31, photoelectrical coupler 27, the 2nd resistance 28, the 6th resistance 34, the 7th resistance 35 and the 3rd diode 36 form, voltage comparator circuit 31 is by the 2nd diode 22, the 3rd resistance 23, operational amplification circuit 24, when the 4th resistance 29 and light-emitting diode 25 form, power end zero line 5 connects an end of the 1st resistance 19 and anode and the negative electrode of electric capacity 21 and the power end negative pole of operational amplification circuit 24 of voltage stabilizing didoe 20, the output head anode of rectification circuit 13 connects the other end of the 1st resistance 19 and negative electrode and the anode of electric capacity 21 and power end positive pole and the in-phase input end of operational amplification circuit 24 and an end of the 4th resistance 29 of operational amplification circuit 24 of voltage stabilizing didoe 20, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the inverting input of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the negative electrode of the output connecting luminous diode 25 of operational amplification circuit 24, the other end of the 4th resistance 29 connects the luminous tube anode of photoelectrical coupler 27, the anode of the luminous tube negative electrode connecting luminous diode 25 of photoelectrical coupler 27, the phototriode collector electrode of photoelectrical coupler 27 connects the power end positive pole of amplifying circuit 17, the phototriode emitter of photoelectrical coupler 27 connects an end of the 6th resistance 34, the other end of the 6th resistance 34 connects an end of the 2nd resistance 28 and an end of the 7th resistance 35, the other end of the 7th resistance 35 connects the anode of the 3rd diode 36, the negative electrode of the 3rd diode 36 connects an input of amplifying circuit 17, and the other end of the 2nd resistance 28 connects the negative pole of output end of rectification circuit 13.
When described ground line detection circuit 32 by the 1st resistance 19, voltage stabilizing didoe 20, electric capacity 21, voltage comparator circuit 31, photoelectrical coupler 27 and the 2nd resistance 28 form, described voltage comparator circuit 31 is by the 2nd diode 22, the 3rd resistance 23, operational amplification circuit 24, when the 5th resistance 26 and light-emitting diode 25 form, power end zero line 5 connects an end of the 1st resistance 19 and anode and the negative electrode of electric capacity 21 and the power end negative pole of operational amplification circuit 24 of voltage stabilizing didoe 20, the output head anode of rectification circuit 13 connects the other end and the negative electrode of voltage stabilizing didoe 20 and anode and the power end positive pole of operational amplification circuit 24 and the inverting input of operational amplification circuit 24 of electric capacity 21 of the 1st resistance 19, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the in-phase input end of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the anode of the output connecting luminous diode 25 of operational amplification circuit 24, the negative electrode of light-emitting diode 25 connects the luminous tube anode of photoelectrical coupler 27, the luminous tube negative electrode of photoelectrical coupler 27 connects an end of the 5th resistance 26, the power end negative pole of the other end concatenation operation amplifying circuit 24 of the 5th resistance 26, the phototriode collector electrode of photoelectrical coupler 27 connects the power end positive pole of amplifying circuit 17, the phototriode emitter of photoelectrical coupler 27 connects the trigger electrode of controllable silicon 14 and an end of the 2nd resistance 28, and the other end of the 2nd resistance 28 connects the negative pole of output end of rectification circuit 13.
When described ground line detection circuit 32 by the 1st resistance 19, voltage stabilizing didoe 20 and voltage comparator circuit 31 form, described voltage comparator circuit 31 is by the 2nd diode 22, the 3rd resistance 23, operational amplification circuit 24, when the 5th resistance 26 and light-emitting diode 25 form, power end zero line 5 connects an end and the anode of voltage stabilizing didoe 20 and the power end negative pole of operational amplification circuit 24 of the 1st resistance 19, the negative electrode of rectifier diode 30 connects the other end of the 1st resistance 19 and negative electrode and the power end positive pole of operational amplification circuit 24 and the inverting input of operational amplification circuit 24 of voltage stabilizing didoe 20, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the in-phase input end of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the anode of the output connecting luminous diode 25 of operational amplification circuit 24, the negative electrode of light-emitting diode 25 connects an end of the 5th resistance 26 and the trigger electrode of controllable silicon 14, the power end negative pole of the other end concatenation operation amplifying circuit 24 of the 5th resistance 26.
When described ground line detection circuit 32 by the 2nd diode 22, the 3rd resistance 23, operational amplification circuit 24, when the 5th resistance 26 and light-emitting diode 25 form, the power end negative pole of power end zero line 5 concatenation operation amplifying circuits 24 and an end of the 5th resistance 26, the power end positive pole of the anodal concatenation operation amplifying circuit 24 of the power end of amplifying circuit 17 and the inverting input of operational amplification circuit 24, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the in-phase input end of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the anode of the output connecting luminous diode 25 of operational amplification circuit 24, the negative electrode of light-emitting diode 25 connect the other end of the 5th resistance 26 and the trigger electrode of controllable silicon 14.
The signal output part of described ground line detection circuit 32 can connect the trigger electrode of controllable silicon 14 or the input of amplifying circuit 17.
In use, zero sequence current mutual inductor 18 can be delivered to control circuit 33 with the residual current signal that detects, electric current by the controllable silicon 14 bypass solenoids 11 of control circuit 33, solenoid 11 no longer produces electromagnetic force, making threads off loses snap close power with locker, thus phase, the zero-sum ground wire of deenergization end and load end.
When a kind of earth leakage protective device access power end; only have power end phase line 6 to be connected with zero line and connect correctly; phase line is charged; it is electric that solenoid 11 is got; produce electromagnetic force; press the push rod that resets, threading off could snap close with locker, with phase line 6, zero line 5 and ground wire 7 contacts of power end respectively with phase line 9, zero line 8 and ground wire 10 contact closure of load end.In case the phase line 6 of power end or zero line 5 disappearances, solenoid 11 loses electromagnetic force, and threading off does not have the snap close ability with locker, will disconnect immediately original power end and the phase line between the load end, zero line and ground wire contact at closure state.
When a kind of earth leakage protective device access power end, ground line detection circuit 32 is just started working, and voltage comparator circuit 31 can compare the reference voltage of power end ground wire 7 voltages and setting.Charged and reach and set threshold values or ground wire 7 disappearances when the ground wire 7 of power end, or phase line 6 is during with zero line 5 reversal connection, voltage comparator circuit 31 can make light-emitting diode 25 conductings light, and make luminous tube conducting in the photoelectrical coupler 17, thereby make the also conducting of phototriode in the photoelectrical coupler 17, directly or by amplifying circuit 17 trigger controllable silicon 14 conductings, make solenoid 11 lose electromagnetic force, thread off and disconnect phase with locker, the zero-sum ground wire, realized disconnecting the function of dangerous power supply, light-emitting diode 25 is lighted warning always simultaneously, and reminding user will be got rid of the hidden danger of ground wire fault as early as possible.
Characteristics of the present invention are: except same can detect have or not residual current between load phase, the zero line and detect ground wire whether charged, and between phase, zero line with ground wire break down respectively or simultaneously Shi Douhui move immediately mutually, zero, outside ground wire all disconnects; The power end that also is a kind of earth leakage protective device of the present invention is connected with control circuit and ground line detection circuit; when the phase of power end or zero line disappearance or phase, zero line reversal connection; it can disconnect phase line, zero line, ground wire; when causing the ground wire accident, the ground protection system exception is with upper dangerous voltage; or the electric leakage of ground protection system earth disappearance or consuming device is when causing on exposed metal parts and the ground tape dangerous voltage; it can detect and report to the police; leakage protecting plug is threaded off automatically; also can disconnect phase line, zero line, ground wire, cut off dangerous trouble power.
Compared with prior art, the present invention has following remarkable result:
(1) a kind of earth leakage protective device of the present invention is owing to be connected with control circuit at power end; in use; in case the phase line of power end or zero line disappearance; control circuit does not have normal current supply circuit; the solenoid that is connected in control circuit does not produce electromagnetic force; threading off enters trip status with locker, has disconnected dangerous trouble power.
(2) a kind of earth leakage protective device of the present invention is owing to be connected with the ground line detection circuit at power end; in use; in case the electric leakage of the consuming device fault on leakage protecting plug load end phase, the zero line; or the ground protection system exception is when causing the ground wire accident to be with dangerous voltage; the metal parts that consuming device exposes and leakage protecting plug ground wire all can be with dangerous voltage; the ground line detection circuit just can detect, and implements to report to the police and trigger phase line, zero line and the ground wire that trip circuit is cut off the electricity supply and held.Needn't touch and flow through residual current by people or livestock and could thread off afterwards.
(3) a kind of earth leakage protective device of the present invention is owing to be connected with the ground line detection circuit at power end; in use; when in case ground protection system ground wire disappearance (the socket ground wire is without ground connection) and load end consuming device do not have ground connection yet; the ground line detection circuit just can detect, and enforcement is reported to the police and trigger control circuit is cut off the electricity supply and held phase line, zero line and ground wire.The reminding user ground wire is unusual.
(4) a kind of earth leakage protective device of the present invention is owing to be connected with the ground line detection circuit at power end; in use; exceed the safe voltage threshold values that presets when lower (such as 24V, or) as long as ground wire electrification is pressed, leakage protecting plug of the present invention just can be threaded off and be cut off the power supply and warning.
(5) a kind of earth leakage protective device of the present invention also can be threaded off when the phase line of power end and zero line reversal connection automatically; can not reset; only have just coming into operation after the correction of the wiring state of supply socket phase line and zero line; forcibly standard the user side supply socket wiring requirement that must meet national regulation connect, in case there is potential safety hazard when using.
A kind of earth leakage protective device of the present invention is applicable on the earth leakage protective of various household electrical appliance.
Description of drawings
Fig. 1 is a kind of earth leakage protective device electrical principle schematic diagram of the embodiment of the invention 1, and solenoid uses direct current, and ground wire voltage is inputted by the operational amplification circuit inverting input.
Fig. 2 is a kind of earth leakage protective device electrical principle schematic diagram of the embodiment of the invention 2, and solenoid uses alternating current, and ground wire voltage is inputted by the operational amplification circuit in-phase input end.
Fig. 3 is a kind of earth leakage protective device electrical principle schematic diagram of the embodiment of the invention 3, and control circuit uses the diode halfwave rectifier, and the output signal of ground line detection circuit directly triggers controllable silicon.
Fig. 4 is a kind of earth leakage protective device electrical principle schematic diagram of the embodiment of the invention 4, and the amplifying circuit in the ground line detection circuit output signal access control circuit triggers controllable silicon by amplifying circuit.
Fig. 5 is a kind of earth leakage protective device electrical principle schematic diagram of the embodiment of the invention 5, and the ground line detection circuit provides stabilized voltage power supply by the voltage stabilizing circuit in the amplifying circuit in the control circuit.
Embodiment
By following embodiment the present invention is further elaborated.
Embodiment 1
Referring to shown in Figure 1; a kind of earth leakage protective device is mainly by forming with lower member: shell; the phase line 6 of power end; zero line 5; ground wire 7; the phase line 9 of load end; zero line 8; ground wire 10; the test loop; zero sequence current mutual inductor 18; ground line detection circuit 32; thread off and locker; this dropout and locker comprise phase line contact 2-2 and 1-2; zero line contact 2-1 and 1-1; ground wire contact 3 and 4; spring; push rod resets; solenoid 11; control circuit 33; this control circuit 33 is by current-limiting resistance 12; rectification circuit 13; controllable silicon 14; the 1st diode 16; amplifying circuit 17 and dropping resistor 15 form; ground line detection circuit 32 is by the 1st resistance 19; voltage stabilizing didoe 20; electric capacity 21; voltage comparator circuit 31; photoelectrical coupler 27 and the 2nd resistance 28 form, and voltage comparator circuit 31 is by the 2nd diode 22; the 3rd resistance 23; operational amplification circuit 24; the 4th resistance 29 and light-emitting diode 25 form.
In the present embodiment, be connected with control circuit 33 between the phase line 6 of power end and the zero line 5.The phase line 6 of power end connects an end of current-limiting resistance 12, the other end of current-limiting resistance 12 connects an input of rectification circuit 13, another input of rectification circuit 13 connects power end zero line 5, the output head anode of rectification circuit 13 connects anode and an end of solenoid 11 and an end of dropping resistor 15 of controllable silicon 14, the negative pole of output end of rectification circuit 13 connects negative electrode and the other end of solenoid 11 and the power end negative pole of amplifying circuit 17 of controllable silicon 14, the anodal other end that connects dropping resistor 15 of the power end of amplifying circuit 17, the signal output part of amplifying circuit 17 connects the anode of the 1st diode 16, the negative electrode of the 1st diode 16 connects the trigger electrode of controllable silicon 14, and the two ends of the secondary output of zero sequence current mutual inductor 18 connect respectively the two ends of amplifying circuit 17 inputs.
Power end zero line 5 connects an end of the 1st resistance 19 and anode and the negative electrode of electric capacity 21 and the power end negative pole of operational amplification circuit 24 of voltage stabilizing didoe 20, the output head anode of rectification circuit 13 connects the other end of the 1st resistance 19 and negative electrode and the anode of electric capacity 21 and power end positive pole and the in-phase input end of operational amplification circuit 24 and an end of the 4th resistance 29 of operational amplification circuit 24 of voltage stabilizing didoe 20, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the inverting input of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the negative electrode of the output connecting luminous diode 25 of operational amplification circuit 24, the other end of the 4th resistance 29 connects the luminous tube anode of photoelectrical coupler 27, the anode of the luminous tube negative electrode connecting luminous diode 25 of photoelectrical coupler 27, the phototriode collector electrode of photoelectrical coupler 27 connects the power end positive pole of amplifying circuit 17, the phototriode emitter of photoelectrical coupler 27 connects the trigger electrode of controllable silicon 14 and an end of the 2nd resistance 28, and the other end of the 2nd resistance 28 connects the negative pole of output end of rectification circuit 13.
In the use; when this earth leakage protective device power end do not power on or phase, zero line one of them suddenly during disappearance; power end phase line 6 does not have electricity or does not have current supply circuit; be connected between power end phase line 6, the zero line 5 control circuit 33 not electric; solenoid 11 does not produce electromagnetic attraction; threading off can not snap close with locker, and leakage protecting plug can't reset, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1 and ground wire contact 4 and 3 all are in off-state.
When this earth leakage protective device power end connects correct working power; power end phase line 6 gets electric; be connected to power end phase line 6; control circuit 33 between the zero line 5 and solenoid 11 energisings produce electromagnetic attraction; ready with the locker reset lock for threading off; when the push rod that resets is pressed; thread off and utilize the electromagnetic attraction snap close of solenoid 11 and make phase line contact 2-2 and 1-2 with locker; zero line contact 2-1 and 1-1 and ground wire contact 4 and 3 be closed the connection all, power end phase line 6 and load end phase line 9; power end zero line 5 and load end zero line 8; power end ground wire 7 is all connected with load end ground wire 10.The zero line 5 of power end is zero with the voltage of ground wire 7 during normal condition, only has phase line 6 charged.Rectification circuit 13 and zero line 5 provide power supply for ground line detection circuit 32, the 1st resistance 19, voltage stabilizing didoe 20 and electric capacity 21 provide stabilized voltage power supply and reference voltage for the voltage comparator circuit 31 of ground line detection circuit 32, the 2nd diode 22 of voltage comparator circuit 31 is connected with ground wire 7, voltage comparator circuit 31 is by judging output high level or low level to the voltage of ground wire 7 and the contrast of reference voltage.Voltage when ground wire 7 and 10 is zero, or with voltage and do not reach when setting threshold values (such as 24V), the output of operational amplification circuit 24 still keeps high level, photoelectrical coupler 27 and light-emitting diode 25 not conductings (indicator light does not work), phototriode in the photoelectrical coupler 27 does not have conducting yet, controllable silicon 14 is not received triggering signal, keeps cut-off state, and solenoid 11 keeps energising, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 still remains closed.Non-vanishing and institute is with voltage when setting threshold values (such as 24V) when the voltage of ground wire 7 and 10, or ground wire virtual connection and when causing without ground connection, the output of operational amplification circuit 24 then transfers low level to, (indicator light is lighted for photoelectrical coupler 27 and light-emitting diode 25 conductings, the prompting user ground wire is unusual), also immediately conducting of phototriode in the photoelectrical coupler 27, triggering signal is delivered to the trigger electrode of controllable silicon 14, make it become conducting state by cut-off state, solenoid 11 is bypassed, lose electromagnetic force, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4 will disconnect immediately.
Electric leakage and ground protection system exception cause ground wire 7 and 10 accident is charged when occuring simultaneously when the phase line 9 of load end, consuming device on the zero line 8 break down, owing to residual current occurs by zero sequence current mutual inductor 18, after amplifying circuit 17 in the control circuit 33 can amplify processing from the induced signal of zero sequence current mutual inductor 18, deliver to the trigger electrode of controllable silicon 14 by diode 16; Simultaneously, from also the be added to trigger electrode of controllable silicon 14 of the triggering signal of ground line detection circuit 32.As long as one of them signal arrives first, or two signal arrive simultaneously the trigger electrode of controllable silicon 14, can both make controllable silicon 14 conductings, make solenoid 11 not produce electromagnetic force, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 will disconnect immediately.
When the zero utmost point of Power supply socket connects instead with the utmost point mutually, when namely the zero line 5 of power end and phase line 6 were by reversal connection, zero line 5 was charged, and phase line 6 and ground wire 7 are no-voltage.Ground line detection circuit 32 is in the negative half period work of the sinusoidal alternating current of power end, the voltage of ground wire 7 is higher than the reference voltage of voltage comparator circuit 31 at this moment, then operational amplification circuit 24 outputs are low level, (indicator light is lighted for photoelectrical coupler 27 and light-emitting diode 25 conductings, the prompting user power end zero connects instead mutually), also immediately conducting of phototriode in the photoelectrical coupler 27, triggering signal is delivered to the trigger electrode of controllable silicon 14, make it become conducting state by cut-off state, solenoid 11 does not produce electromagnetic force, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 will disconnect immediately.
Embodiment 2
Referring to shown in Figure 2; a kind of earth leakage protective device is mainly by forming with lower member: shell; the phase line 6 of power end; zero line 5; ground wire 7; the phase line 9 of load end; zero line 8; ground wire 10; the test loop; zero sequence current mutual inductor 18; ground line detection circuit 32; thread off and locker; this dropout and locker comprise phase line contact 2-2 and 1-2; zero line contact 2-1 and 1-1; ground wire contact 3 and 4; spring; push rod resets; solenoid 11; control circuit 33; this control circuit 33 is by current-limiting resistance 12; rectification circuit 13; controllable silicon 14; the 1st diode 16; amplifying circuit 17 and dropping resistor 15 form; ground line detection circuit 32 is by the 1st resistance 19; voltage stabilizing didoe 20; electric capacity 21; voltage comparator circuit 31; photoelectrical coupler 27 and the 2nd resistance 28 form, and voltage comparator circuit 31 is by the 2nd diode 22; the 3rd resistance 23; operational amplification circuit 24; the 5th resistance 26 and light-emitting diode 25 form.
In the present embodiment, be connected with control circuit 33 between the phase line 6 of power end and the zero line 5.The phase line 6 of power end connects an end of current-limiting resistance 12, the other end of current-limiting resistance 12 connects input of rectification circuit 13 and an end of solenoid 11, another input of rectification circuit 13 connects the other end of power end zero line 5 and solenoid 11, the output head anode of rectification circuit 13 connects the anode of controllable silicon 14 and an end of dropping resistor 15, the negative pole of output end of rectification circuit 13 connects the negative electrode of controllable silicon 14 and the power end negative pole of amplifying circuit 17, the anodal other end that connects dropping resistor 15 of the power end of amplifying circuit 17, the signal output part of amplifying circuit 17 connects the anode of the 1st diode 16, the negative electrode of the 1st diode 16 connects the trigger electrode of controllable silicon 14, and the two ends of the secondary output of zero sequence current mutual inductor 18 connect respectively the two ends of amplifying circuit 17 inputs.
Power end zero line 5 connects an end of the 1st resistance 19 and anode and the negative electrode of electric capacity 21 and the power end negative pole of operational amplification circuit 24 of voltage stabilizing didoe 20, and the output head anode of rectification circuit 13 connects the other end and the negative electrode of voltage stabilizing didoe 20 and anode and the power end positive pole of operational amplification circuit 24 and the inverting input of operational amplification circuit 24 of electric capacity 21 of the 1st resistance 19.Power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the in-phase input end of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the anode of the output connecting luminous diode 25 of operational amplification circuit 24, the negative electrode of light-emitting diode 25 connects the luminous tube anode of photoelectrical coupler 27, the luminous tube negative electrode of photoelectrical coupler 27 connects an end of the 5th resistance 26, the power end negative pole of the other end concatenation operation amplifying circuit 27 of the 5th resistance 26, the phototriode collector electrode of photoelectrical coupler 27 connects the power end positive pole of amplifying circuit 17, the phototriode emitter of photoelectrical coupler 27 connects the trigger electrode of controllable silicon 14 and an end of the 2nd resistance 28, and the other end of the 2nd resistance 28 connects the negative pole of output end of rectification circuit 13.
In the use; when this earth leakage protective device power end do not power on or phase, zero line one of them suddenly during disappearance; power end phase line 6 does not have electricity or does not have current supply circuit; be connected between power end phase line 6, the zero line 5 control circuit 33 not electric; solenoid 11 does not produce electromagnetic attraction; threading off can not snap close with locker, and leakage protecting plug can't reset, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1 and ground wire contact 4 and 3 all are in off-state.
When this earth leakage protective device power end connects correct working power; power end phase line 6 gets electric; be connected to power end phase line 6; control circuit 33 between the zero line 5 and solenoid 11 energisings produce electromagnetic attraction; ready with the locker reset lock for threading off; when the push rod that resets is pressed; thread off and utilize the electromagnetic attraction snap close of solenoid 11 and make phase line contact 2-2 and 1-2 with locker; zero line contact 2-1 and 1-1 and ground wire contact 4 and 3 be closed the connection all, power end phase line 6 and load end phase line 9; power end zero line 5 and load end zero line 8; power end ground wire 7 is all connected with load end ground wire 10.The zero line 5 of power end is zero with the voltage of ground wire 7 during normal condition, only has phase line 6 charged.Rectification circuit 13 and zero line 5 provide power supply for ground line detection circuit 32, the 1st resistance 19, voltage stabilizing didoe 20 and electric capacity 21 provide stabilized voltage power supply and reference voltage for the voltage comparator circuit 31 of ground line detection circuit 32, the 2nd diode 22 of voltage comparator circuit 31 is connected with ground wire 7, voltage comparator circuit 31 is by judging output high level or low level to the voltage of ground wire 7 and the contrast of reference voltage.Voltage when ground wire 7 and 10 is zero, or with voltage and do not reach when setting threshold values (such as 24V), the output of operational amplification circuit 24 still keeps low level, photoelectrical coupler 27 and light-emitting diode 25 not conductings (indicator light does not work), phototriode in the photoelectrical coupler 27 does not have conducting yet, controllable silicon 14 is not received triggering signal, keeps cut-off state, and solenoid 11 keeps energising, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 still remains closed.Non-vanishing and institute is with voltage when setting threshold values (such as 24V) when the voltage of ground wire 7 and 10, or ground wire virtual connection and when causing without ground connection, the output of operational amplification circuit 24 then transfers high level to, (indicator light is lighted for photoelectrical coupler 27 and light-emitting diode 25 conductings, the prompting user ground wire is unusual), also immediately conducting of phototriode in the photoelectrical coupler 27, triggering signal is delivered to the trigger electrode of controllable silicon 14, make it become conducting state by cut-off state, solenoid 11 is bypassed, lose electromagnetic force, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 will disconnect immediately.
Electric leakage and ground protection system exception cause ground wire 7 and 10 accident is charged when occuring simultaneously when the phase line 9 of load end, consuming device on the zero line 8 break down, owing to residual current occurs by zero sequence current mutual inductor 18, after amplifying circuit 17 in the control circuit 33 can amplify processing from the induced signal of zero sequence current mutual inductor 18, deliver to the trigger electrode of controllable silicon 14 by diode 16; Simultaneously, from also the be added to trigger electrode of controllable silicon 14 of the triggering signal of ground line detection circuit 32.As long as one of them signal arrives first, or two signals arrive the trigger electrode of controllable silicon 14 simultaneously, can both make controllable silicon 14 conductings, and solenoid 11 does not produce electromagnetic force, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 will disconnect immediately.
When the zero utmost point of Power supply socket connects instead with the utmost point mutually, when namely the zero line 5 of power end and phase line 6 were by reversal connection, zero line 5 was charged, and phase line 6 and ground wire 7 are no-voltage.Ground line detection circuit 32 is in the negative half period work of the sinusoidal alternating current of power end, the voltage of ground wire 7 is higher than the reference voltage of voltage comparator circuit 31 at this moment, then operational amplification circuit 24 outputs are high level, (indicator light is lighted for photoelectrical coupler 27 and light-emitting diode 25 conductings, the prompting user power end zero connects instead mutually), also immediately conducting of phototriode in the photoelectrical coupler 27, triggering signal is delivered to the trigger electrode of controllable silicon 14, make it become conducting state by cut-off state, solenoid 11 does not produce electromagnetic force, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4 will disconnect immediately.
Embodiment 3
Referring to shown in Figure 3; a kind of earth leakage protective device is mainly by forming with lower member: shell; the phase line 6 of power end; zero line 5; ground wire 7; the phase line 9 of load end; zero line 8; ground wire 10; the test loop; zero sequence current mutual inductor 18; ground line detection circuit 32; thread off and locker; this dropout and locker comprise phase line contact 2-2 and 1-2; zero line contact 2-1 and 1-1; ground wire contact 4 and 3; spring; push rod resets; solenoid 11; control circuit 33; this control circuit 33 is by current-limiting resistance 12; rectifier diode 30; controllable silicon 14; the 1st diode 16; amplifying circuit 17 and dropping resistor 15 form; ground line detection circuit 32 is by the 1st resistance 19; voltage stabilizing didoe 20 and voltage comparator circuit 31 form, and voltage comparator circuit 31 is by the 2nd diode 22; the 3rd resistance 23; operational amplification circuit 24; the 5th resistance 26 and light-emitting diode 25 form.
In the present embodiment, be connected with control circuit 33 between the phase line 6 of power end and the zero line 5.The phase line 6 of power end connects an end of current-limiting resistance 12, the other end of current-limiting resistance 12 connects the anode of rectifier diode 30, the negative electrode of rectifier diode 30 connects an end and the anode of controllable silicon 14 and an end of dropping resistor 15 of solenoid 11, power end zero line 5 connects the other end and the negative electrode of controllable silicon 14 and the power end negative pole of amplifying circuit 17 of solenoid 11, the anodal other end that connects dropping resistor 15 of the power end of amplifying circuit 17, the signal output part of amplifying circuit 17 connects the anode of the 1st diode 16, the negative electrode of the 1st diode 16 connects the trigger electrode of controllable silicon 14, and the two ends of the secondary output of zero sequence current mutual inductor 18 connect respectively the two ends of amplifying circuit 17 inputs.
Power end zero line 5 connects an end and the anode of voltage stabilizing didoe 20 and the power end negative pole of operational amplification circuit 24 of the 1st resistance 19, the negative electrode of rectifier diode 30 connects the other end of the 1st resistance 19 and negative electrode and the power end positive pole of operational amplification circuit 24 and the inverting input of operational amplification circuit 24 of voltage stabilizing didoe 20, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the in-phase input end of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the anode of the output connecting luminous diode 25 of operational amplification circuit 24, the negative electrode of light-emitting diode 25 connects an end of the 5th resistance 26 and the trigger electrode of controllable silicon 14, the power end negative pole of the other end concatenation operation amplifying circuit 24 of the 5th resistance 26.
In the use; when this earth leakage protective device power end do not power on or phase, zero line one of them suddenly during disappearance; power end phase line 6 does not have electricity or does not have current supply circuit; be connected between power end phase line 6, the zero line 5 control circuit 33 not electric; solenoid 11 does not produce electromagnetic attraction; threading off can not snap close with locker, and leakage protecting plug can't reset, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1 and ground wire contact 4 and 3 all are in off-state.
When this earth leakage protective device power end connects the normal operation power supply; power end phase line 6 gets electric; be connected to power end phase line 6; control circuit 33 between the zero line 5 and solenoid 11 energisings produce electromagnetic attraction; ready with the locker reset lock for threading off; when the push rod that resets is pressed; thread off and utilize the electromagnetic attraction snap close of solenoid 11 and make phase line contact 2-2 and 1-2 with locker; zero line contact 2-1 and 1-1 and ground wire contact 4 and 3 be closed the connection all, power end phase line 6 and load end phase line 9; power end zero line 5 and load end zero line 8; power end ground wire 7 is all connected with load end ground wire 10.The zero line 5 of power end is zero with the voltage of ground wire 7 during normal condition, only has phase line 6 charged.Rectifier diode 30 and zero line 5 provide power supply for ground line detection circuit 32, the 1st resistance 19 and voltage stabilizing didoe 20 provide stabilized voltage power supply and reference voltage for the voltage comparator circuit 31 of ground line detection circuit 32, the 2nd diode 22 of voltage comparator circuit 31 is connected with ground wire 7, voltage comparator circuit 31 is by judging output high level or low level to the voltage of ground wire 7 and the contrast of reference voltage.Voltage when ground wire 7 and 10 is zero, or with voltage and do not reach when setting threshold values (such as 24V), the output of operational amplification circuit 24 still keeps low level, light-emitting diode 25 not conductings (indicator light does not work), and controllable silicon 14 is not received triggering signal, keep cut-off state, solenoid 11 keeps energising, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 still remains closed.Non-vanishing and institute is with voltage when setting threshold values (such as 24V) when the voltage of ground wire 7 and 10, or ground wire virtual connection and when causing without ground connection, the output of operational amplification circuit 24 then transfers high level to, (indicator light is lighted in light-emitting diode 25 conductings, the prompting user ground wire is unusual), the conducting triggering signal is delivered to the trigger electrode of controllable silicon 14, make it become conducting state by cut-off state, solenoid 11 is bypassed, lose electromagnetic force, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 will disconnect immediately.
Electric leakage and ground protection system exception cause ground wire 7 and 10 accident is charged when occuring simultaneously when the phase line 9 of load end, consuming device on the zero line 8 break down, owing to residual current occurs by zero sequence current mutual inductor 18, after amplifying circuit 17 in the control circuit 33 can amplify processing from the induced signal of zero sequence current mutual inductor 18, deliver to the trigger electrode of controllable silicon 14 by diode 16; Simultaneously, from also the be added to trigger electrode of controllable silicon 14 of the triggering signal of ground line detection circuit 32.As long as one of them signal arrives first, or two signals arrive the trigger electrode of controllable silicon 14 simultaneously, can both make controllable silicon 14 conductings, and solenoid 11 does not produce electromagnetic force, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 will disconnect immediately.
When the zero utmost point of Power supply socket connects instead with the utmost point mutually, when namely the zero line 5 of power end and phase line 6 were by reversal connection, zero line 5 was charged, and phase line 6 and ground wire 7 are no-voltage.Ground line detection circuit 32 is in the negative half period work of the sinusoidal alternating current of power end, the voltage of ground wire 7 is higher than the reference voltage of voltage comparator circuit 31 at this moment, then operational amplification circuit 24 outputs are high level, (indicator light is lighted in light-emitting diode 25 conductings, the prompting user power end zero connects instead mutually), the conducting triggering signal is delivered to the trigger electrode of controllable silicon 14, make it become conducting state by cut-off state, solenoid 11 does not produce electromagnetic force, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 4 and 3 will disconnect immediately.
Embodiment 4
Referring to shown in Figure 4; a kind of earth leakage protective device is mainly by forming with lower member: shell; the phase line 6 of power end; zero line 5; ground wire 7; the phase line 9 of load end; zero line 8; ground wire 10; the test loop; zero sequence current mutual inductor 18; ground line detection circuit 32; thread off and locker; this dropout and locker comprise phase line contact 2-2 and 1-2; zero line contact 2-1 and 1-1; ground wire contact 3 and 4; spring; push rod resets; solenoid 11; control circuit 33; this control circuit 33 is by current-limiting resistance 12; rectification circuit 13; controllable silicon 14; amplifying circuit 17 and dropping resistor 15 form; ground line detection circuit 32 is by the 1st resistance 19; voltage stabilizing didoe 20; electric capacity 21; voltage comparator circuit 31; photoelectrical coupler 27; the 2nd resistance 28; the 6th resistance 34; the 7th resistance 35 and the 3rd diode 36 form, and voltage comparator circuit 31 is by the 2nd diode 22; the 3rd resistance 23; operational amplification circuit 24; the 4th resistance 29 and light-emitting diode 25 form.
In the present embodiment, be connected with control circuit 33 between the phase line 6 of power end and the zero line 5, the phase line 6 of power end connects an end of current-limiting resistance 12, the other end of current-limiting resistance 12 connects an input of rectification circuit 13, another input of rectification circuit 13 connects power end zero line 5, the output head anode of rectification circuit 13 connects anode and an end of solenoid 11 and an end of dropping resistor 15 of controllable silicon 14, the negative pole of output end of rectification circuit 13 connects negative electrode and the other end of solenoid 11 and the power end negative pole of amplifying circuit 17 of controllable silicon 14, the anodal other end that connects dropping resistor 15 of the power end of amplifying circuit 17, the signal output part of amplifying circuit 17 connects the trigger electrode of controllable silicon 14, and the two ends of the secondary output of zero sequence current mutual inductor 18 connect respectively the two ends of amplifying circuit 17 inputs.
Power end zero line 5 connects an end of the 1st resistance 19 and anode and the negative electrode of electric capacity 21 and the power end negative pole of operational amplification circuit 24 of voltage stabilizing didoe 20, the output head anode of rectification circuit 13 connects the other end of the 1st resistance 19 and negative electrode and the anode of electric capacity 21 and power end positive pole and the in-phase input end of operational amplification circuit 24 and an end of the 4th resistance 29 of operational amplification circuit 24 of voltage stabilizing didoe 20, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode 22 connects an end of the 3rd resistance 23, the inverting input of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the negative electrode of the output connecting luminous diode 25 of operational amplification circuit 24, the other end of the 4th resistance 29 connects the luminous tube anode of photoelectrical coupler 27, the anode of the luminous tube negative electrode connecting luminous diode 25 of photoelectrical coupler 27, the phototriode collector electrode of photoelectrical coupler 27 connects the power end positive pole of amplifying circuit 17, the phototriode emitter of photoelectrical coupler 27 connects an end of the 6th resistance 34, the other end of the 6th resistance 34 connects an end of the 2nd resistance 28 and an end of the 7th resistance 35, the other end of the 7th resistance 35 connects the anode of the 3rd diode 36, the negative electrode of the 3rd diode 36 connects an input of amplifying circuit 17, and the other end of the 2nd resistance 28 connects the negative pole of output end of rectification circuit 13.
The signal of the phototriode emitter output of the photoelectrical coupler 27 in the ground line detection circuit 32 is by 34 step-downs of the 6th resistance, by the 7th resistance 35 current limlitings, an input that connects again the amplifying circuit 17 in the control circuit 33 through the 3rd diode 36, after the output signal processing by 17 pairs of electric wire testing circuits 32 of amplifying circuit, trigger again controllable silicon 14.Remaining circuit structure is all identical with embodiment 1 with operation principle, does not repeat them here.
Embodiment 5
Referring to shown in Figure 5; a kind of earth leakage protective device is mainly by forming with lower member: shell; the phase line 6 of power end; zero line 5; ground wire 7; the phase line 9 of load end; zero line 8; ground wire 10; the test loop; zero sequence current mutual inductor 18; ground line detection circuit 32; thread off and locker; this dropout and locker comprise phase line contact 2-2 and 1-2; zero line contact 2-1 and 1-1; ground wire contact 4 and 3; spring; push rod resets; solenoid 11; control circuit 33; this control circuit 33 is by current-limiting resistance 12; rectifier diode 30; controllable silicon 14; the 1st diode 16; amplifying circuit 17 and dropping resistor 15 form, and ground line detection circuit 32 is by the 2nd diode 22; the 3rd resistance 23; operational amplification circuit 24; the 5th resistance 26 and light-emitting diode 25 form.
In the present embodiment, be connected with control circuit 33 between the phase line 6 of power end and the zero line 5.The phase line 6 of power end connects an end of current-limiting resistance 12, and the other end of current-limiting resistance 12 connects the anode of rectifier diode 30, rectifier diode 30
Negative electrode connect an end and the anode of controllable silicon 14 and an end of dropping resistor 15 of solenoid 11, power end zero line 5 connects the other end and the negative electrode of controllable silicon 14 and the power end negative pole of amplifying circuit 17 of solenoid 11, the anodal other end that connects dropping resistor 15 of the power end of amplifying circuit 17, the signal output part of amplifying circuit 17 connects the anode of the 1st diode 16, the negative electrode of the 1st diode 16 connects the trigger electrode of controllable silicon 14, and the two ends of the secondary output of zero sequence current mutual inductor 18 connect respectively the two ends of amplifying circuit 17 inputs.
The power end negative pole of power end zero line 5 concatenation operation amplifying circuits 24 and an end of the 5th resistance 26, the power end positive pole of the anodal concatenation operation amplifying circuit 24 of the power end of amplifying circuit 17 and the inverting input of operational amplification circuit 24, power end ground wire 7 connects the anode of the 2nd diode 22, the negative electrode of the 2nd diode connects an end of the 3rd resistance 23, the in-phase input end of the other end concatenation operation amplifying circuit 24 of the 3rd resistance 23, the anode of the output connecting luminous diode 25 of operational amplification circuit 24, the negative electrode of light-emitting diode 25 connect the other end of the 5th resistance 26 and the trigger electrode of controllable silicon 14.
In the present embodiment, since the power end of ground line detection circuit 32 be with control circuit 33 in the power end of amplifying circuit 17 be connected in parallel, therefore line detection circuit 32 can utilize amplifying circuit 17 built-in voltage stabilizing circuit 17-1 to obtain stabilized voltage power supply, the remaining circuit structure is all identical with embodiment 3 with operation principle, does not repeat them here.

Claims (10)

1. earth leakage protective device; comprise shell; the phase line of power end (6); zero line (5); ground wire (7); the zero sequence current mutual inductor (18) that the phase line of load end (9) and zero line (8) all pass; the test loop; ground line detection circuit (32); thread off and locker; this dropout and locker comprise solenoid (11) and control circuit (33); contact; spring; push rod resets; described control circuit (33) is mainly by rectification circuit (13); controllable silicon (14); amplifying circuit (17) forms; it is characterized in that: be connected with control circuit (33) and solenoid (11) between the phase line of described power end (6) and the zero line (5), the zero line of described power end (5); be connected with ground line detection circuit (32) between ground wire (7) and the control circuit (33).
2. a kind of earth leakage protective device according to claim 1; it is characterized in that: described control circuit (33) also contains current-limiting resistance (12); dropping resistor (15) and the 1st diode (16); the phase line of described power end (6) connects an end of current-limiting resistance (12); the other end of current-limiting resistance (12) connects an input of rectification circuit (13); another input of rectification circuit (13) connects power end zero line (5); the output head anode of rectification circuit (13) connects anode and an end of solenoid (11) and an end of dropping resistor (15) of controllable silicon (14); the negative pole of output end of rectification circuit (13) connects negative electrode and the other end of solenoid (11) and the power end negative pole of amplifying circuit (17) of controllable silicon (14); the anodal other end that connects dropping resistor (15) of the power end of amplifying circuit (17); the signal output part of amplifying circuit (17) connects the anode of the 1st diode (16); the negative electrode of the 1st diode (16) connects the trigger electrode of controllable silicon (14), and the two ends of the secondary output of zero sequence current mutual inductor (18) connect respectively the two ends of amplifying circuit (17) input.
3. a kind of earth leakage protective device according to claim 1; it is characterized in that: described control circuit (33) also contains current-limiting resistance (12); dropping resistor (15) and the 1st diode (16); the phase line of described power end (6) connects an end of current-limiting resistance (12); the other end of current-limiting resistance (12) connects input of rectification circuit (13) and an end of solenoid (11); another input of rectification circuit (13) connects the other end of power end zero line (5) and solenoid (11); the output head anode of rectification circuit (13) connects the anode of controllable silicon (14) and an end of dropping resistor (15); the negative pole of output end of rectification circuit (13) connects the negative electrode of controllable silicon (14) and the power end negative pole of amplifying circuit (17); the anodal other end that connects dropping resistor (15) of the power end of amplifying circuit (17); the signal output part of amplifying circuit (17) connects the anode of the 1st diode (16); the negative electrode of the 1st diode (16) connects the trigger electrode of controllable silicon (14), and the two ends of the secondary output of zero sequence current mutual inductor (18) connect respectively the two ends of amplifying circuit (17) input.
4. a kind of earth leakage protective device according to claim 1; it is characterized in that: described control circuit (33) also contains current-limiting resistance (12); dropping resistor (15) and the 1st diode (16); described rectification circuit (13) is rectifier diode (30); the phase line of described power end (6) connects an end of current-limiting resistance (12); the other end of current-limiting resistance (12) connects the anode of rectifier diode (30); the negative electrode of rectifier diode (30) connects an end and the anode of controllable silicon (14) and an end of dropping resistor (15) of solenoid (11); power end zero line (5) connects the other end and the negative electrode of controllable silicon (14) and the power end negative pole of amplifying circuit (17) of solenoid (11); the anodal other end that connects dropping resistor (15) of the power end of amplifying circuit (17); the signal output part of amplifying circuit (17) connects the anode of the 1st diode (16); the negative electrode of the 1st diode (16) connects the trigger electrode of controllable silicon (14), and the two ends of the secondary output of zero sequence current mutual inductor (18) connect respectively the two ends of amplifying circuit (17) input.
5. a kind of earth leakage protective device according to claim 1; it is characterized in that: described ground line detection circuit (32) is by the 1st resistance (19); voltage stabilizing didoe (20); electric capacity (21); voltage comparator circuit (31); photoelectrical coupler (27) and the 2nd resistance (28) form; described voltage comparator circuit (31) is by the 2nd diode (22); the 3rd resistance (23); operational amplification circuit (24); the 4th resistance (29) and light-emitting diode (25) form; power end zero line (5) connects an end of the 1st resistance (19) and anode and the negative electrode of electric capacity (21) and the power end negative pole of operational amplification circuit (24) of voltage stabilizing didoe (20); the output head anode of rectification circuit (13) connects the other end of the 1st resistance (19) and negative electrode and the anode of electric capacity (21) and power end positive pole and the in-phase input end of operational amplification circuit (24) and an end of the 4th resistance (29) of operational amplification circuit (24) of voltage stabilizing didoe (20); power end ground wire (7) connects the anode of the 2nd diode (22); the negative electrode of the 2nd diode (22) connects an end of the 3rd resistance (23); the inverting input of the other end concatenation operation amplifying circuit (24) of the 3rd resistance (23); the negative electrode of the output connecting luminous diode (25) of operational amplification circuit (24); the other end of the 4th resistance (29) connects the luminous tube anode of photoelectrical coupler (27); the anode of the luminous tube negative electrode connecting luminous diode (25) of photoelectrical coupler (27); the phototriode collector electrode of photoelectrical coupler (27) connects the power end positive pole of amplifying circuit (17); the phototriode emitter of photoelectrical coupler (27) connects the trigger electrode of controllable silicon (14) and an end of the 2nd resistance (28), and the other end of the 2nd resistance (28) connects the negative pole of output end of rectification circuit (13).
6. a kind of earth leakage protective device according to claim 5; it is characterized in that: described ground line detection circuit (32) also contains the 6th resistance (34); the 7th resistance (35) and the 3rd diode (36); the phototriode emitter of described photoelectrical coupler (27) connects an end of the 6th resistance (34); the other end of the 6th resistance (34) connects an end of the 2nd resistance (28) and an end of the 7th resistance (35); the other end of the 7th resistance (35) connects the anode of the 3rd diode (36), and the negative electrode of the 3rd diode (36) connects an input of amplifying circuit (17).
7. a kind of earth leakage protective device according to claim 1; it is characterized in that: described ground line detection circuit (32) is by the 1st resistance (19); voltage stabilizing didoe (20); electric capacity (21); voltage comparator circuit (31); photoelectrical coupler (27) and the 2nd resistance (28) form; described voltage comparator circuit (31) is by the 2nd diode (22); the 3rd resistance (23); operational amplification circuit (24); the 5th resistance (26) and light-emitting diode (25) form; power end zero line (5) connects an end of the 1st resistance (19) and anode and the negative electrode of electric capacity (21) and the power end negative pole of operational amplification circuit (24) of voltage stabilizing didoe (20); the output head anode of rectification circuit (13) connects the other end and the negative electrode of voltage stabilizing didoe (20) and anode and the power end positive pole of operational amplification circuit (24) and the inverting input of operational amplification circuit (24) of electric capacity (21) of the 1st resistance (19); power end ground wire (7) connects the anode of the 2nd diode (22); the negative electrode of the 2nd diode (22) connects an end of the 3rd resistance (23); the in-phase input end of the other end concatenation operation amplifying circuit (24) of the 3rd resistance (23); the anode of the output connecting luminous diode (25) of operational amplification circuit (24); the negative electrode of light-emitting diode (25) connects the luminous tube anode of photoelectrical coupler (27); the luminous tube negative electrode of photoelectrical coupler (27) connects an end of the 5th resistance (26); the power end negative pole of the other end concatenation operation amplifying circuit (24) of the 5th resistance (26); the phototriode collector electrode of photoelectrical coupler (27) connects the power end positive pole of amplifying circuit (17); the phototriode emitter of photoelectrical coupler (27) connects the trigger electrode of controllable silicon (14) and an end of the 2nd resistance (28), and the other end of the 2nd resistance (28) connects the negative pole of output end of rectification circuit (13).
8. a kind of earth leakage protective device according to claim 1; it is characterized in that: described ground line detection circuit (32) is by the 1st resistance (19); voltage stabilizing didoe (20) and voltage comparator circuit (31) form; described voltage comparator circuit (31) is by the 2nd diode (22); the 3rd resistance (23); operational amplification circuit (24); the 5th resistance (26) and light-emitting diode (25) form; power end zero line (5) connects an end and the anode of voltage stabilizing didoe (20) and the power end negative pole of operational amplification circuit (24) of the 1st resistance (19); the negative electrode of rectifier diode (30) connects the other end of the 1st resistance (19) and negative electrode and the power end positive pole of operational amplification circuit (24) and the inverting input of operational amplification circuit (24) of voltage stabilizing didoe (20); power end ground wire (7) connects the anode of the 2nd diode (22); the negative electrode of the 2nd diode (22) connects an end of the 3rd resistance (23); the in-phase input end of the other end concatenation operation amplifying circuit (24) of the 3rd resistance (23); the anode of the output connecting luminous diode (25) of operational amplification circuit (24); the negative electrode of light-emitting diode (25) connects an end of the 5th resistance (26) and the trigger electrode of controllable silicon (14), the power end negative pole of the other end concatenation operation amplifying circuit (24) of the 5th resistance (26).
9. a kind of earth leakage protective device according to claim 1; it is characterized in that: described ground line detection circuit (32) is by the 2nd diode (22); the 3rd resistance (23); operational amplification circuit (24); the 5th resistance (26) and light-emitting diode (25) form; one end of the power end negative pole of power end zero line (5) concatenation operation amplifying circuit (24) and the 5th resistance (26); the power end positive pole of the anodal concatenation operation amplifying circuit of the power end of amplifying circuit (17) (24) and the inverting input of operational amplification circuit (24); power end ground wire (7) connects the anode of the 2nd diode (22); the negative electrode of the 2nd diode (22) connects an end of the 3rd resistance (23); the in-phase input end of the other end concatenation operation amplifying circuit (24) of the 3rd resistance (23); the anode of the output connecting luminous diode (25) of operational amplification circuit (24), the negative electrode of light-emitting diode (25) connect the other end of the 5th resistance (26) and the trigger electrode of controllable silicon (14).
10. a kind of earth leakage protective device according to claim 1, it is characterized in that: the signal output part of described ground line detection circuit (32) can connect the trigger electrode of controllable silicon (14) or the input of amplifying circuit (17).
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CN104158029A (en) * 2014-07-17 2014-11-19 福建农林大学 Anti-electric shock socket
CN104917147B (en) * 2015-05-25 2018-04-13 余姚市嘉荣电子电器有限公司 Ground wire zero curve partial pressure sampling type earth leakage protective device
CN111443308A (en) * 2018-12-28 2020-07-24 深圳市优必选科技有限公司 Magnetic type steering engine and hot plug detection circuit and orientation detection circuit thereof
CN111864691A (en) * 2019-04-30 2020-10-30 上海复旦微电子集团股份有限公司 Ground fault protection circuit
CN111864694A (en) * 2019-04-30 2020-10-30 上海复旦微电子集团股份有限公司 Residual current protection circuit
CN111478204A (en) * 2020-03-30 2020-07-31 深圳市三巨电机有限公司 Protection device and distribution box with same

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