CN102386609B - Leakage protection device - Google Patents

Leakage protection device Download PDF

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CN102386609B
CN102386609B CN 201110410246 CN201110410246A CN102386609B CN 102386609 B CN102386609 B CN 102386609B CN 201110410246 CN201110410246 CN 201110410246 CN 201110410246 A CN201110410246 A CN 201110410246A CN 102386609 B CN102386609 B CN 102386609B
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voltage comparator
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CN102386609A (en
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刘睿刚
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Abstract

The invention discloses a leakage protection device which can prevent electric shock accidents caused by faults of electric equipment and also can prevent the electric shock accidents caused by the fact that an earth wire is electrified accidently. The leakage protection device is also provided with a weak current detection sensor, a voltage comparator circuit and a one-way output circuit; an iron core of the weak current detection sensor is wound by a primary winding and a secondary winding; a detection circuit which is formed by serially connecting the primary winding with a current-limiting capacitance resistance element is connected between the earth wire and a neutral wire; a standard voltage obtained from a stable-voltage power supply is input into an input end of the voltage comparator circuit; an output end of the secondary winding of the weak current detection sensor and the other output end thereof are respectively connected with the other input end of the voltage comparator circuit and a cathode of the output end of a rectifying circuit; and the output end of the voltage comparator circuit is connected with a driving circuit of an electromagnetic coil through the one-way output circuit.

Description

A kind of earth leakage protective device
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to a kind of earth leakage protective device.
Background technology
Chinese patent literature CN1142618C discloses the leakage protecting plug that a kind of ground wire can open and close, not only be provided with zero sequence current mutual inductor that phase line and zero line all pass on this leakage protecting plug, also be provided with the ground wire electrified detection inductor that ground wire passes, therefore it not only can detect between load end phase line and the zero line and have or not residual current, when occurring residual current between phase, the zero line and reaching the threshold values that presets (for example: 10mA), it will be threaded off immediately, cuts off phase line, zero line and ground wire; And when the ground protection system exception causes the ground wire accident charged; it can also detect the load end ground wire the zero accident electric current; (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.
As from the foregoing; existing earth leakage protective device is exactly the load end phase in the unexpected precondition that can thread off when charged of the electric leakage of load end fault or ground wire; must have between the zero line and must have a mind to extrinsic current on residual current or the load end ground wire and flow through and to thread off; so just there is following defective in existing earth leakage protective device: during use; no matter be when ground protection system ground wire disappearance (for example: the virtual connection of socket ground wire causes without ground connection) and the electric leakage of earth leakage protective device load end consuming device insulation fault; or at the ground protection system exception (for example: phase line; when earth short) causing the ground wire accident charged; dangerous voltage on the exposed metal parts band of consuming device is caused in the capital; but they all do not consist of the loop thereby also do not produce the unexpected electric current of residual current or ground wire; so; although consuming device exposed metal parts have been with dangerous voltage; but existing earth leakage protective device can not threaded off in this case automatically; only have when human body or livestock touch these band power on the exposed metal parts time; just form the loop through human body or livestock; thereby producing the unexpected electric current of residual current or ground wire threads off and phase line earth leakage protective device in 0.1S; zero line; ground wire disconnects; although in time threading off, it has protected the life security of people or livestock; but existing earth leakage protective device be in this case must be first by human body or livestock get an electric shock produce residual current or the unexpected electric current of ground wire and flow through human body or livestock after; it could be threaded off phase line; zero line; ground wire disconnects, so existing earth leakage protective device still can cause the electric shock accidents of human body or livestock.
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 be in the phase of load end; consuming device on the zero line road occurs that electric leakage or ground wire meet accident can be in time the phase line contact when charged; zero line contact and ground wire contact all disconnect; and it can also will be threaded off before people or livestock touch consuming device when the consuming device that ground connection disappearance and earth leakage protective device load end appear in the ground protection system electric leakage occurs causes on consuming device shell and the ground tape dangerous voltage or when ground protection system abnormal causes the ground wire accident to be with dangerous voltage automatically; in time phase line; zero line and ground wire disconnect, for people provide the higher earth leakage protective device of reliability and better Electrical Safety guarantee.
Technical solution proposed by the invention is such:
A kind of earth leakage protective device; include shell; phase line; zero line; ground wire; the zero sequence current mutual inductor that phase line and zero line all pass; the test loop; electromagnetic trip and locker; this electromagnetic trip and locker comprise solenoid and drive circuit thereof; contact; the drive circuit of described solenoid is mainly by rectification circuit; the 1st controllable silicon forms; one output of described zero sequence current mutual inductor secondary winding and another output respectively be connected the input of drive circuit of solenoid and be connected with another input; also be provided with the weak current inductor; voltage comparator circuit; unidirectional output circuit; described weak current inductor is provided with iron core; armature winding and secondary winding; described weak current inductor armature winding and described weak current inductor secondary winding are all on described weak current inductor iron core; between ground wire and zero line, be connected with the detection loop that is in series by described weak current inductor armature winding and current limliting Resistor-Capacitor Unit; input described voltage comparator circuit one input from the reference voltage that stabilized voltage power supply obtains; described weak current inductor secondary winding one output is connected with another input of described voltage comparator circuit; described another output of weak current inductor secondary winding is connected with described rectification circuit output end negative pole, and described voltage comparator circuit output is connected with the drive circuit of solenoid by described unidirectional output circuit.
When also being provided with amplifying circuit in the drive circuit at described solenoid, one input of the drive circuit of described solenoid and another input are respectively an input and another input of described amplifying circuit, and described amplifying circuit triggers the signal of output output and sends into the 1st controllable silicon trigger electrode.
One input of the drive circuit of described solenoid and another input are respectively described the 1st silicon controlled trigger electrode and negative electrode.
When also being provided with the 3rd resistance, the 4th resistance, the 2nd diode in the drive circuit at described solenoid, described the 3rd resistance one end is connected with described rectification circuit output end is anodal, the 3rd resistance other end is connected with the 4th resistance one end, the 4th resistance other end is connected with the 2nd diode cathode, the 2nd diode cathode is connected with described rectification circuit output end negative pole, the 3rd resistance other end is connected with the voltage stabilizing didoe negative pole with the tie point of the 4th resistance one end, and voltage stabilizing didoe is anodal to be connected with the rectification circuit output end negative pole; One input of the drive circuit of described solenoid and another input are respectively described the 1st controllable silicon trigger electrode and described the 2nd diode cathode.
Described current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.
Described weak current inductor iron core is made by permalloy or amorphous alloy or ultramicro-crystal alloy material.
The detection loop that described weak current inductor armature winding and current limliting Resistor-Capacitor Unit are in series is connected between the ground wire of power end and the zero line or is connected between the ground wire and zero line of load end.
When also being provided with the 1st resistance, the 2nd resistance, the loop that described the 1st resistance and the 2nd resistance are in series is connected between the end and the other end of stabilized voltage power supply, the 1st resistance one end is connected with stabilized voltage power supply one end, the 1st resistance other end is connected with the 2nd resistance one end, the 2nd resistance other end is connected with the stabilized voltage power supply other end, and described reference voltage is obtained from the tie point of the 1st resistance other end and the 2nd resistance one end.
When described reference voltage is sent into described voltage comparator circuit one input, when this input is the inverting input of voltage comparator circuit; Described weak current inductor secondary winding one output is connected with another input of described voltage comparator circuit, and this input is the in-phase input end of voltage comparator circuit.
When described reference voltage is sent into described voltage comparator circuit one input, when this input is the in-phase input end of voltage comparator circuit; Described weak current inductor secondary winding one output is connected with another input of described voltage comparator circuit, and this input is the inverting input of voltage comparator circuit.
When described unidirectional output circuit was comprised of the 1st diode, the output of described voltage comparator circuit was connected with described the 1st diode cathode, and described the 1st diode cathode is connected with described the 1st controllable silicon trigger electrode.
When described unidirectional output circuit is comprised of the NPN triode, the output of described voltage comparator circuit is connected with described NPN transistor base, described NPN transistor emitter is connected with described the 1st controllable silicon trigger electrode, and described NPN transistor collector is connected with stabilized voltage power supply one end.
When described unidirectional output circuit is comprised of the PNP triode, the output of described voltage comparator circuit is connected with described PNP transistor base, described PNP transistor collector is connected with described the 1st controllable silicon trigger electrode, and described PNP transistor emitter is connected with stabilized voltage power supply one end.
When described unidirectional output circuit was comprised of the 2nd controllable silicon, the output of described voltage comparator circuit was connected with the 2nd controllable silicon trigger electrode, and the 2nd silicon controlled anode and negative electrode are connected in parallel with described the 1st silicon controlled anode and negative electrode respectively.
The negative pole that one end of described stabilized voltage power supply and the other end are respectively voltage stabilizing didoe is with anodal.
The output that one end of described stabilized voltage power supply and the other end are respectively three terminal regulator and ground end.
The power end that one end of described stabilized voltage power supply and the other end are respectively described amplifying circuit and ground end.
Described voltage comparator circuit is voltage comparator exclusive disjunction amplifier.
Substantive features of the present invention are can detect the load phase except the same with the earth leakage protective device of prior art; whether chargedly have or not residual current between the zero line and detect ground wire; work as phase; move immediately mutually with the ground wire Shi Douhui that breaks down respectively or simultaneously between the zero line; zero; outside ground wire all disconnects; be that also earth leakage protective device of the present invention is provided with the detection loop that is in series by weak current inductor and current limliting Resistor-Capacitor Unit between ground wire and zero line; and the weak current inductor is detected; induction output detects with triggering silicon controlled circuit and zero sequence current mutual inductor; induction output with trigger the silicon controlled circuit and independently divide and be arranged; when detecting also can not cause when inductor has signal output simultaneously, weak current inductor and zero-sequence current interact like this; when causing the ground wire accident, the ground protection system exception is with upper dangerous voltage or when the electric leakage of ground protection system earth disappearance and consuming device causes on exposed metal parts and the ground tape dangerous voltage; it can detect automatically; the induction output signal also threads off earth leakage protective device automatically; phase line; zero line; ground wire disconnects, thus realized human body or livestock touch these with on before the exposed metal parts of dangerous voltage just phase line; zero line; ground wire disconnects entirely.
Compared with prior art, the present invention has following remarkable result:
(1); earth leakage protective device of the present invention is owing to be connected with the detection loop that is composed in series by weak current inductor armature winding and current limliting Resistor-Capacitor Unit between ground wire and zero line; when in use; in case earth leakage protective device load end phase; when the consuming device fault electric leakage on the zero line and ground protection system ground wire disappearance (for example: the virtual connection of socket ground wire causes without ground connection); the metal parts that consuming device exposes and earth leakage protective device ground wire all can be with dangerous voltage; the weak current inductor will detect; induction and output signal; and the reference voltage of this signal and voltage comparator circuit compared; when signal voltage reaches predetermined value; the voltage comparator circuit output signal triggers controlled silicon conducting; make the earth leakage protective device just can be in time phase line before human body or livestock touch consuming device; zero line and ground wire disconnect entirely; it must human body when this situation than existing earth leakage protective device or livestock touch and flow through could thread off after the residual current better technical solution is provided, so it is more safer than existing earth leakage protective device.
(2); earth leakage protective device of the present invention is owing to be connected with the detection loop that is composed in series by weak current inductor armature winding and current limliting Resistor-Capacitor Unit between ground wire and zero line; when in use; when in case the ground protection system exception causes the ground wire accident to be with dangerous voltage; the weak current inductor will detect; induction and output signal; and the reference voltage of this signal and voltage comparator circuit compared; when signal voltage reaches predetermined value; the voltage comparator circuit output signal triggers controlled silicon conducting; make the earth leakage protective device just can be in time phase line before human body or livestock touch electrical equipment; zero line and ground wire disconnect entirely; it must human body when this situation than existing earth leakage protective device or livestock touch and flow through could thread off after the unexpected electric current of ground wire better technical solution is provided, so it is more safer than existing earth leakage protective device.
(3); earth leakage protective device of the present invention is owing to the weak current inductor armature winding that is connected between ground wire and the zero line also can detect the low current signal that flows through it; induction and output signal; and this armature winding is without the restriction of minimum starting voltage; so it to ground wire with voltage height unrestricted; as long as flowing through the electric current of weak current inductor armature winding reaches certain value (for example: 10 microamperes) and will make signal voltage that weak current inductor secondary winding exports greater than the reference voltage of voltage comparator circuit; voltage comparator circuit will thread off earth leakage protective device of the present invention by output signal triggering controlled silicon conducting; therefore it not only ground wire (or consuming device exposed metal parts) with dangerous voltage highly can thread off during for 250V; and ground wire with voltage (or lower when being low to moderate predetermined 36V safe voltage; for example: 24V) also can reliably thread off; when ground wire with voltage when being lower than predetermined 36V safe voltage; it does not just need to thread off to avoid misoperation; the voltage range that it can shield is wide; so; earth leakage protective device of the present invention not only uses well, and safety and reliability.
(4), 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 other contingencies occur when using.
(5), earth leakage protective device of the present invention the detection of weak current inductor, induction output, comparison, output signal trigger that the silicon controlled circuit detects with zero sequence current mutual inductor, induction output signal triggering silicon controlled circuit independently divides and is arranged; when detecting also can not cause when inductor has signal output simultaneously, weak current inductor and zero-sequence current interfere with each other like this, thus safer and reliable.
Earth leakage protective device of the present invention is mainly used on the earth leakage protective of various household electrical appliance, can make a kind of leakage protecting plug or a kind of earth leakage protective socket to earth leakage protective device of the present invention according to technical scheme of the present invention and electrical principle schematic diagram.
Description of drawings
Fig. 1 is the earth leakage protective device electrical principle schematic diagram of the 1st embodiment of the present invention.
Fig. 2 is the earth leakage protective device electrical principle schematic diagram of the 2nd embodiment of the present invention.
Fig. 3 is the earth leakage protective device electrical principle schematic diagram of the 3rd embodiment of the present invention.
Fig. 4 is the earth leakage protective device electrical principle schematic diagram of the 4th embodiment of the present invention.
Fig. 5 is the earth leakage protective device electrical principle schematic diagram of the 5th embodiment of the present invention.
Fig. 6 is the earth leakage protective device electrical principle schematic diagram of the 6th embodiment of the present invention.
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 shell; the phase line 5 of power end; zero line 6; ground wire 7; the phase line 8 of load end; zero line 9; ground wire 10; rectification circuit 12; the 1st controllable silicon 13; amplifying circuit 14; zero sequence current mutual inductor 15; test loop 16; current limliting Resistor-Capacitor Unit 17; weak current inductor 18; the 1st resistance 19; the 2nd resistance 20; electromagnetic trip and locker; voltage comparator circuit 21; unidirectional output circuit forms, and electromagnetic trip and locker are mainly by solenoid 11 and drive circuit thereof; phase line contact 1-1 and 2-1; zero line contact 1-2 and 2-2; ground wire contact 3 and 4; spring; the push rod that resets forms.
In the present embodiment, the drive circuit of described solenoid 11 mainly is comprised of rectification circuit 12, the amplifying circuit 14 that is built-in with stabilized voltage power supply 14-1, the 1st controllable silicon 13, one output of described zero sequence current mutual inductor 15 secondary winding is connected with another input with the input that another output is connected with amplifying circuit respectively, and amplifying circuit 14 triggers the signal of output output and sends into the 1st controllable silicon 13 trigger electrodes.
In the present embodiment, the detection loop that weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 are composed in series is connected between the ground wire 7 and zero line 6 of power end, weak current inductor 18 secondary winding one output is connected with voltage comparator circuit 21 in-phase input ends (+), another output of weak current inductor 18 secondary winding respectively with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) connect, the reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop, the power end of the 1st resistance 19 1 ends and the amplifying circuit 14 that is built-in with stabilized voltage power supply 14-1 (+VS) be connected, the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, the 2nd resistance 20 other ends respectively with voltage comparator circuit 21 ground ends, amplifying circuit 14 ground ends (GND) connect, the 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends, unidirectional output circuit adopts the 1st diode 22, voltage comparator circuit 21 outputs and 22 anodal connections of the 1st diode, the 1st diode 22 negative poles are connected with the 1st controllable silicon 13 trigger electrodes.
In the present embodiment, current limliting Resistor-Capacitor Unit 17 is resistance, also can adopt electric capacity or resistance and capacitance component, the iron core of weak current inductor 18 adopts the ultramicro-crystal alloy material to make, also can adopt amorphous alloy or permalloy material to make, the detection loop that weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 are in series is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected to load end.
In the present embodiment, unidirectional output circuit is selected the 1st diode 22, also can select triode or the 2nd controllable silicon.
In the present embodiment, utilized the built-in stabilized voltage power supply 14-1 of amplifying circuit 14 as stabilized voltage power supply.
In the present embodiment, voltage comparator circuit 21 adopts voltage comparator, also can adopt operational amplifier.
During use; the push rod that resets of earth leakage protective device is pressed; phase line contact 1-1 and 2-1; zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 are all normally connected; the phase line 8 of load end; zero line 9; ground wire 10 respectively with the phase line 5 of power end; zero line 6; ground wire 7 is connected; ground wire 7 and 10 is because the effect of ground connection is clamped at about zero volt voltage; zero line 6 and 9 also is about zero volt simultaneously; be connected to like this ground wire 7 of earth leakage protective device power end and electric current that the detection loop that is comprised of weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 between the zero line 6 does not just have electric current to flow through or flow through and do not reach the threshold values (for example: 10 microamperes) that presets; the signal voltage of exporting to voltage comparator circuit 21 in-phase input ends (+) by weak current inductor 18 secondary winding inductions is just less than the reference voltage of voltage comparator circuit 21 inverting inputs (-); voltage comparator circuit 21 outputs just are maintained low-voltage; 22 cut-offs of the 1st diode; the cut-off of the 1st controllable silicon; earth leakage protective device just remains on the "on" position that resets like this, thereby for the power supply of the consuming device of its lower end with ground connection is provided.
When ground protection system abnormal (for example: phase; ground short circuit causes the ground wire accident charged) when causing ground wire 7 and 10 accidents to be with dangerous voltage; being connected to like this ground wire 7 of power end and the detection loop that is comprised of weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 between the zero line 6 just has a weak current to flow through; signal of weak current inductor 18 secondary winding output is to voltage comparator circuit 21 in-phase input ends (+); and when weak current reaches the threshold values (for example: 10 microamperes) that presets; export to the signal voltage of voltage comparator circuit 21 in-phase input ends (+) greater than the reference voltage of voltage comparator circuit 21 inverting inputs (-) by the induction of weak current inductor 18 secondary winding; voltage comparator circuit 21 outputs just become high voltage; make 22 conductings of the 1st diode; thereby trigger 13 conductings of the 1st controllable silicon and earth leakage protective device is threaded off; just can be in time phase line contact 1-1 and 2-1 before people touch consuming device; zero line contact 1-2 and 2-2; ground wire contact 3 and 4 all disconnects, thereby ensures better people's Electrical Safety.
Phase line 8 when load end, consuming device fault on the zero line 9 electric leakage and in the normal situation of ground protection system lower time, can produce a residual current through ground wire 10 and 7, zero sequence current mutual inductor 15 can detect phase, residual current between the zero line is also exported a signal to amplifying circuit 14, and when residual current reaches the threshold values (for example: 10 milliamperes) that presets, amplifying circuit 14 triggers the output output signal, because the 1st diode 22 oppositely ends, thereby trigger 13 conductings of the 1st controllable silicon, earth leakage protective device is threaded off, just can be in time phase line contact 1-1 and 2-1 before people touch consuming device, zero line contact 1-2 and 2-2, ground wire contact 3 and 4 all disconnects; And when the phase line 8 of load end; consuming device fault on the zero line 9 electric leakage and in the ground protection system during without ground connection (for example: the ground wire virtual connection causes without ground connection on the socket); the metal parts that consuming device exposes and earth leakage protective device ground wire 10 and 7 all can be with dangerous voltage; the detection loop that is comprised of weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 that is connected between earth leakage protective device power end ground wire 7 and the zero line 6 just has a weak current to flow through; signal of weak current inductor 18 secondary winding output is to voltage comparator circuit 21 in-phase input ends (+); and when weak current reaches the threshold values (for example: 10 microamperes) that presets; export to the signal voltage of voltage comparator circuit 21 in-phase input ends (+) greater than the reference voltage of voltage comparator circuit 21 inverting inputs (-) by the induction of weak current inductor 18 secondary winding; voltage comparator circuit 21 outputs just become high voltage; 22 conductings of the 1st diode; thereby trigger 13 conductings of the 1st controllable silicon and earth leakage protective device is threaded off; just can be in time phase line contact 1-1 and 2-1 before people touch consuming device; zero line contact 1-2 and 2-2; ground wire contact 3 and 4 all disconnects, thereby ensures better people's Electrical Safety.
Embodiment 2
Referring to shown in Figure 2, present embodiment is compared with embodiment 1, and the present embodiment stabilized voltage power supply adopts voltage stabilizing didoe 24 voltage stabilizings, and unidirectional output circuit adopts NPN triode 23.
In the present embodiment, form between weak current inductor 18 armature windings and the ground wire 7 that is connected to power end after current limliting Resistor-Capacitor Unit 17 is connected and the zero line 6 and detect the loop, weak current inductor 18 secondary winding one output is connected with voltage comparator circuit 21 in-phase input ends (+), and another output of weak current inductor 18 secondary winding is connected with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end respectively; The reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop, the 1st resistance 19 1 ends are connected with voltage stabilizing didoe 24 negative poles, the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, the 2nd resistance 20 other ends respectively with voltage comparator circuit 21 ground ends, 24 anodal connections of voltage stabilizing didoe, the 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends, voltage comparator circuit 21 outputs are connected with NPN triode 23 base stages, NPN triode 23 collector electrodes are connected with voltage stabilizing didoe 24 negative poles, and NPN triode 23 emitters are connected with the 1st controllable silicon 13 trigger electrodes.
In the present embodiment, current limliting Resistor-Capacitor Unit 17 is resistance, also can adopt electric capacity or resistance and capacitance component, the iron core of weak current inductor 18 adopts the ultramicro-crystal alloy material to make, also can adopt amorphous alloy or permalloy material to make, the detection loop that weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 are in series is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected to load end.
In the present embodiment, unidirectional output circuit is selected NPN triode 23, also can select the 1st diode or the 2nd controllable silicon.
In the present embodiment, voltage comparator circuit 21 adopts voltage comparator, also can adopt operational amplifier.
Because present embodiment compares with embodiment 1, only for voltage comparator circuit 21 provides the stabilized voltage power supply of reference voltage and unidirectional output circuit different, remaining structure forms all identical with embodiment 1 with circuit theory, does not repeat them here.
Embodiment 3
Referring to shown in Figure 3; a kind of earth leakage protective device is mainly by shell; the phase line 5 of power end; zero line 6; ground wire 7; the phase line 8 of load end; zero line 9; ground wire 10; rectification circuit 12; the 1st controllable silicon 13; amplifying circuit 14; zero sequence current mutual inductor 15; test loop 16; current limliting Resistor-Capacitor Unit 17; weak current inductor 18; the 1st resistance 19; the 2nd resistance 20; electromagnetic trip and locker; three terminal regulator 26; voltage comparator circuit 21; unidirectional output circuit forms, and electromagnetic trip and locker are mainly by solenoid 11 and drive circuit thereof; phase line contact 1-1 and 2-1; zero line contact 1-2 and 2-2; ground wire contact 3 and 4; spring; the push rod that resets forms.
In the present embodiment, the drive circuit of described solenoid 11 mainly is comprised of rectification circuit 12, amplifying circuit 14, the 1st controllable silicon 13.One output of described zero sequence current mutual inductor 15 secondary winding and another output respectively be connected an input of the amplifying circuit 14 in the drive circuit of solenoid 11 and be connected with another input, amplifying circuit 14 triggers the signal of outputs output and sends into the 1st controllable silicon 13 trigger electrodes.
In the present embodiment, form between weak current inductor 18 armature windings and the ground wire 7 that is connected to power end after current limliting Resistor-Capacitor Unit 17 is connected and the zero line 6 and detect the loop, weak current inductor 18 secondary winding one output is connected with voltage comparator circuit 21 inverting inputs (-), another output of weak current inductor 18 secondary winding respectively with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) connect, the reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop, the 1st resistance 19 1 ends are connected with three terminal regulator 26 outputs (Vo), the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, the 2nd resistance 20 other ends respectively with voltage comparator circuit 21 ground ends, three terminal regulator 26 ground ends (GND) connect, the 1st resistance 19 other ends are connected with the in-phase input end (+) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends, three terminal regulator 26 inputs (Vi) are connected with rectification circuit 12 output head anodes (+) by current-limiting resistance, unidirectional output circuit adopts PNP triode 25, voltage comparator circuit 21 outputs are connected with PNP triode 25 base stages, PNP triode 25 emitters are connected with three terminal regulator 26 outputs (Vo), and PNP triode 25 collector electrodes are connected with the 1st controllable silicon 13 trigger electrodes.
In the present embodiment, current limliting Resistor-Capacitor Unit 17 is resistance, also can adopt electric capacity or resistance and capacitance component, the iron core of weak current inductor 18 adopts amorphous alloy material to make, also can adopt ultramicro-crystal alloy or permalloy material to make, the detection loop that weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 are in series is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected to load end.
In the present embodiment, unidirectional output circuit is selected PNP triode 25.
In the present embodiment, stabilized voltage power supply adopts three terminal regulator 26 voltage stabilizings, also can select the voltage stabilizing didoe voltage stabilizing or utilize the power end of amplifying circuit 14 and ground to hold voltage stabilizing.
In the present embodiment, voltage comparator circuit 21 adopts voltage comparator, also can adopt operational amplifier.
During use; the push rod that resets of earth leakage protective device is pressed; phase line contact 1-1 and 2-1; zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 are all normally connected; the phase line 8 of load end; zero line 9; ground wire 10 respectively with the phase line 5 of power end; zero line 6; ground wire 7 is connected; ground wire 7 and 10 is because the effect of ground connection is clamped at about zero volt voltage; zero line 6 and 9 also is about zero volt simultaneously; be connected to like this ground wire 7 of earth leakage protective device power end and electric current that the detection loop that is comprised of weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 between the zero line 6 does not just have electric current to flow through or flow through and do not reach the threshold values (for example: 10 microamperes) that presets; export to the signal voltage of voltage comparator circuit 21 inverting inputs (-) less than the reference voltage of voltage comparator circuit 21 in-phase input ends (+) by the induction of weak current inductor 18 secondary winding; voltage comparator circuit 21 outputs just are maintained high voltage; 25 cut-offs of PNP triode; the cut-off of the 1st controllable silicon; earth leakage protective device just remains on the "on" position that resets like this, thereby for the power supply of the consuming device of its lower end with ground connection is provided.
When ground protection system abnormal (for example: phase; ground short circuit causes the ground wire accident charged) cause ground wire 7 and 10 accidents to be with dangerous voltage; being connected to like this ground wire 7 of power end and the detection loop that is comprised of weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 between the zero line 6 just has a weak current to flow through; signal of weak current inductor 18 secondary winding output is to voltage comparator circuit 21 inverting inputs (-); and when weak current reaches predefined threshold values (for example: 10 microamperes); export to the signal voltage of voltage comparator circuit 21 inverting inputs (-) greater than the reference voltage of voltage comparator circuit 21 in-phase input ends (+) by the induction of weak current inductor 18 secondary winding; voltage comparator circuit 21 outputs just become low-voltage; 25 conductings of PNP triode; thereby triggering 13 conductings of the 1st controllable silicon threads off earth leakage protective device; just can be in time phase line contact 1-1 and 2-1 before people touch consuming device; zero line contact 1-2 and 2-2; ground wire contact 3 and 4 all disconnects, thereby ensures better people's Electrical Safety.
Phase line 8 when load end, consuming device fault on the zero line 9 electric leakage and in the normal situation of ground protection system lower time, can produce a residual current through ground wire 10 and 7, zero sequence current mutual inductor 15 can detect phase, residual current between the zero line is also exported a signal to amplifying circuit 14, and when residual current reaches predetermined threshold values (for example: 10 milliamperes), amplifying circuit 14 triggers output and outputs signal to the 1st controllable silicon 13 trigger electrodes, and PNP triode 25 oppositely ends, thereby trigger 13 conductings of the 1st controllable silicon earth leakage protective device is threaded off, just can be in time phase line contact 1-1 and 2-1 before people touch consuming device, zero line contact 1-2 and 2-2, ground wire contact 3 and 4 all disconnects; And when the phase line 8 of load end; consuming device fault on the zero line 9 electric leakage and in the ground protection system during without ground connection (for example: the ground wire virtual connection causes without ground connection on the socket); the metal parts that consuming device exposes and earth leakage protective device ground wire 10 and 7 all can be with dangerous voltage; the detection loop that is comprised of weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 that is connected between earth leakage protective device power end ground wire 7 and the zero line 6 just has a weak current to flow through; weak current inductor 18 secondary winding can be exported a signal to voltage comparator circuit 21 inverting inputs (-); and when weak current reaches predefined threshold values (for example: 10 microamperes); export to the signal voltage of voltage comparator circuit 21 inverting inputs (-) greater than the reference voltage of voltage comparator circuit 21 in-phase input ends (+) by the induction of weak current inductor 18 secondary winding; voltage comparator circuit 21 outputs just become low-voltage; 25 conductings of PNP triode; thereby triggering 13 conductings of the 1st controllable silicon threads off earth leakage protective device; just can be in time phase line contact 1-1 and 2-1 before people touch consuming device; zero line contact 1-2 and 2-2; ground wire contact 3 and 4 all disconnects, thereby ensures better people's Electrical Safety.
Embodiment 4
Referring to shown in Figure 4, present embodiment is compared with embodiment 2, and the unidirectional output circuit of present embodiment adopts the 2nd controllable silicon 27.
In the present embodiment, form between weak current inductor 18 armature windings and the ground wire 7 that is connected to power end after current limliting Resistor-Capacitor Unit 17 is connected and the zero line 6 and detect the loop, weak current inductor 18 secondary winding one output is connected with voltage comparator circuit 21 in-phase input ends (+), another output of weak current inductor 18 secondary winding respectively with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) connect, the reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop, the 1st resistance 19 1 ends are connected with voltage stabilizing didoe 24 negative poles, the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, the 2nd resistance 20 other ends respectively with voltage comparator circuit 21 ground ends, 24 anodal connections of voltage stabilizing didoe, the 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends, voltage comparator circuit 21 outputs are connected with the 2nd controllable silicon 27 trigger electrodes, and the anode of the 2nd controllable silicon 27 and negative electrode are connected in parallel with anode and the negative electrode of the 1st controllable silicon 13 respectively.
In the present embodiment, current limliting Resistor-Capacitor Unit 17 is resistance, also can adopt electric capacity or resistance and capacitance component, the iron core of weak current inductor 18 adopts the permalloy material to make, also can adopt amorphous alloy or ultramicro-crystal alloy material to make, the detection loop that weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 are in series is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected to load end.
In the present embodiment, unidirectional output circuit is selected the 2nd controllable silicon 27.
In the present embodiment, stabilized voltage power supply adopts voltage stabilizing didoe 24 voltage stabilizings, also can select the three terminal regulator voltage stabilizing or utilize the power end of amplifying circuit 14 and ground to hold voltage stabilizing.
In the present embodiment, voltage comparator circuit 21 adopts voltage comparator, also can adopt operational amplifier.
In the present embodiment, the reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 provides after the dividing potential drop; When the magnitude of voltage that elected used weak current inductor 18 secondary winding can be exported larger signal and stabilized voltage power supply hangs down, also can be stabilized voltage power supply directly as the reference voltage of voltage comparator circuit 21, and cancel the 1st resistance 19 and the 2nd resistance 20.
Because present embodiment is compared with embodiment 2, only is that unidirectional output circuit is different, remaining structure forms all identical with embodiment 2 with circuit theory, does not repeat them here.
Embodiment 5
Referring to shown in Figure 5, present embodiment is compared with embodiment 4, has cancelled in the present embodiment embodiment 4 described electricity
Amplifying circuit 14 in the drive circuit of magnetic coil 11.
A kind of earth leakage protective device is mainly by shell; the phase line 5 of power end; zero line 6; ground wire 7; the phase line 8 of load end; zero line 9; ground wire 10; rectification circuit 12; the 1st controllable silicon 13; zero sequence current mutual inductor 15; test loop 16; current limliting Resistor-Capacitor Unit 17; weak current inductor 18; the 1st resistance 19; the 2nd resistance 20; electromagnetic trip and locker; voltage stabilizing didoe 24; voltage comparator circuit 21; unidirectional output circuit forms, and electromagnetic trip and locker are mainly by solenoid 11 and drive circuit thereof; phase line contact 1-1 and 2-1; zero line contact 1-2 and 2-2; ground wire contact 3 and 4; spring; the push rod that resets forms.
In the present embodiment, the drive circuit of described solenoid 11 mainly is comprised of rectification circuit 12, the 1st controllable silicon 13.One output of described zero sequence current mutual inductor 15 secondary winding and another output respectively be connected the trigger electrode of the 1st controllable silicon 13 in the drive circuit of solenoid 11 and be connected with negative electrode, the anode of the 1st controllable silicon 13 and negative electrode are connected respectively the positive pole (+) of output and are connected with negative pole (-) with rectification circuit.
In the present embodiment, form between weak current inductor 18 armature windings and the ground wire 10 that is connected to load end after current limliting Resistor-Capacitor Unit 17 is connected and the zero line 9 and detect the loop, weak current inductor 18 secondary winding one output is connected with voltage comparator circuit 21 in-phase input ends (+), another output of weak current inductor 18 secondary winding respectively with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) connect, the reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop, the 1st resistance 19 1 ends are connected with voltage stabilizing didoe 24 negative poles, the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, the 2nd resistance 20 other ends respectively with voltage comparator circuit 21 ground ends, 24 anodal connections of voltage stabilizing didoe, the 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends, unidirectional output circuit adopts the 2nd controllable silicon 27, voltage comparator circuit 21 outputs are connected with the 2nd controllable silicon 27 trigger electrodes, and the anode of the 2nd controllable silicon 27 and negative electrode are connected in parallel with anode and the negative electrode of the 1st controllable silicon 13 respectively.
In the present embodiment, current limliting Resistor-Capacitor Unit 17 is resistance, also can adopt electric capacity or resistance and capacitance component, the iron core of weak current inductor 18 adopts the ultramicro-crystal alloy material to make, also can adopt amorphous alloy or permalloy material to make, the detection loop that weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 are in series is connected between the ground wire 10 and zero line 9 of load end, also can detect this between ground wire 7 and zero line 6 that loop is connected to power end.
In the present embodiment, unidirectional output circuit is selected the 2nd controllable silicon 27.
In the present embodiment, stabilized voltage power supply is selected voltage stabilizing didoe 24 voltage stabilizings, also can select the three terminal regulator voltage stabilizing.
In the present embodiment, voltage comparator circuit 21 adopts voltage comparator, also can adopt operational amplifier.
Because present embodiment is compared with embodiment 4, only different for the drive circuit that drives solenoid 11, remaining structure forms all identical with embodiment 4 with circuit theory, does not repeat them here.
Embodiment 6
Referring to shown in Figure 6, present embodiment is compared with embodiment 5, and present embodiment has increased the 3rd resistance 28, the 4th resistance 29, the 2nd diode 30 in the drive circuit of solenoid 11.
A kind of earth leakage protective device is mainly by shell; the phase line 5 of power end; zero line 6; ground wire 7; the phase line 8 of load end; zero line 9; ground wire 10; rectification circuit 12; the 1st controllable silicon 13; zero sequence current mutual inductor 15; test loop 16; the 3rd resistance 28; the 4th resistance 29; the 2nd diode 30; current limliting Resistor-Capacitor Unit 17; weak current inductor 18; the 1st resistance 19; the 2nd resistance 20; electromagnetic trip and locker; voltage stabilizing didoe 24; voltage comparator circuit 21; unidirectional output circuit forms, and electromagnetic trip and locker are mainly by solenoid 11 and drive circuit thereof; phase line contact 1-1 and 2-1; zero line contact 1-2 and 2-2; ground wire contact 3 and 4; spring; the push rod that resets forms.
In the present embodiment, the drive circuit of described solenoid 11 is mainly by rectification circuit 12, the 1st controllable silicon 13, the 3rd resistance 28, the 4th resistance 29, the 2nd diode 30 forms, the 3rd resistance 28 1 ends are connected with rectification circuit 12 output head anodes (+), the 3rd resistance 28 other ends are connected with the 4th resistance 29 1 ends, the 4th resistance 29 other ends and 30 anodal connections of the 2nd diode, the 2nd diode 30 negative poles are connected with rectification circuit 12 negative pole of output end (-), the 3rd resistance 28 other ends also are connected with voltage stabilizing didoe 24 negative poles with the tie point of the 4th resistance 29 1 ends, voltage stabilizing didoe 24 positive poles are connected with rectification circuit 12 negative pole of output end (-), one output of described zero sequence current mutual inductor 15 secondary winding and another output respectively with the 1st controllable silicon 13 trigger electrodes and 30 anodal connections of the 2nd diode of being connected in the drive circuit of solenoid 11, the anode of the 1st controllable silicon 13 and negative electrode are connected respectively the positive pole (+) of output and are connected with negative pole (-) with rectification circuit.
In the present embodiment, form between weak current inductor 18 armature windings and the ground wire 7 that is connected to power end after current limliting Resistor-Capacitor Unit 17 is connected and the zero line 6 and detect the loop, weak current inductor 18 secondary winding one output is connected with voltage comparator circuit 21 in-phase input ends (+), another output of weak current inductor 18 secondary winding respectively with voltage comparator circuit 21 ground ends, rectification circuit 12 negative pole of output end (-) connect, the reference voltage of voltage comparator circuit 21 is connected with the 2nd resistance 20 by the 1st resistance 19 and is provided after the dividing potential drop, the 1st resistance 19 1 ends are connected with voltage stabilizing didoe 24 negative poles, the 1st resistance 19 other ends are connected with the 2nd resistance 20 1 ends, the 2nd resistance 20 other ends respectively with voltage comparator circuit 21 ground ends, 24 anodal connections of voltage stabilizing didoe, the 1st resistance 19 other ends are connected with the inverting input (-) of voltage comparator circuit 21 with the tie point of the 2nd resistance 20 1 ends, unidirectional output circuit adopts the 2nd controllable silicon 27, voltage comparator circuit 21 outputs are connected with the 2nd controllable silicon 27 trigger electrodes, and the anode of the 2nd controllable silicon 27 and negative electrode are connected in parallel with anode and the negative electrode of the 1st controllable silicon 13 respectively.
In the present embodiment, current limliting Resistor-Capacitor Unit 17 is resistance, also can adopt electric capacity or resistance and capacitance component, the iron core of weak current inductor 18 adopts the ultramicro-crystal alloy material to make, also can adopt amorphous alloy or permalloy material to make, the detection loop that weak current inductor 18 armature windings and current limliting Resistor-Capacitor Unit 17 are in series is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected to load end.
In the present embodiment, unidirectional output circuit is selected the 2nd controllable silicon 27.
In the present embodiment, stabilized voltage power supply is selected voltage stabilizing didoe 24 voltage stabilizings, also can select the three terminal regulator voltage stabilizing.
In the present embodiment, voltage comparator circuit 21 adopts operational amplifier, also can adopt voltage comparator.
Because present embodiment is compared with embodiment 5, only different for the drive circuit that drives solenoid 11, remaining structure forms all identical with embodiment 5 with circuit theory, does not repeat them here.

Claims (18)

1. earth leakage protective device, include shell, phase line, zero line, ground wire, the zero sequence current mutual inductor that phase line and zero line all pass, the test loop, electromagnetic trip and locker, this electromagnetic trip and locker comprise solenoid and drive circuit thereof, contact, the drive circuit of described solenoid is mainly by rectification circuit, the 1st controllable silicon forms, one output of described zero sequence current mutual inductor secondary winding and another output respectively be connected the input of drive circuit of solenoid and be connected with another input, it is characterized in that: also be provided with the weak current inductor, voltage comparator circuit, unidirectional output circuit; Described weak current inductor is provided with iron core, armature winding and secondary winding, described weak current inductor armature winding and described weak current inductor secondary winding all on described weak current inductor iron core, are connected with the detection loop that is in series by described weak current inductor armature winding and current limliting Resistor-Capacitor Unit between ground wire and zero line; Input described voltage comparator circuit one input from the reference voltage that stabilized voltage power supply obtains, described weak current inductor secondary winding one output is connected with another input of described voltage comparator circuit, described another output of weak current inductor secondary winding is connected with described rectification circuit output end negative pole, and described voltage comparator circuit output is connected with the drive circuit of solenoid by described unidirectional output circuit.
2. earth leakage protective device according to claim 1; it is characterized in that: in the drive circuit of described solenoid, also be provided with amplifying circuit; one input of the drive circuit of described solenoid and another input are respectively an input and another input of described amplifying circuit, and described amplifying circuit triggers the signal of output output and sends into the 1st controllable silicon trigger electrode.
3. earth leakage protective device according to claim 1, it is characterized in that: an input of the drive circuit of described solenoid and another input are respectively described the 1st silicon controlled trigger electrode and negative electrode.
4. earth leakage protective device according to claim 1, it is characterized in that: in the drive circuit of described solenoid, also be provided with the 3rd resistance, the 4th resistance, the 2nd diode, described the 3rd resistance one end is connected with described rectification circuit output end is anodal, the 3rd resistance other end is connected with the 4th resistance one end, the 4th resistance other end is connected with the 2nd diode cathode, the 2nd diode cathode is connected with described rectification circuit output end negative pole, the 3rd resistance other end is connected with the voltage stabilizing didoe negative pole with the tie point of the 4th resistance one end, and voltage stabilizing didoe is anodal to be connected with the rectification circuit output end negative pole; One input of the drive circuit of described solenoid and another input are respectively described the 1st controllable silicon trigger electrode and described the 2nd diode cathode.
5. earth leakage protective device according to claim 1, it is characterized in that: described current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.
6. earth leakage protective device according to claim 1 is characterized in that: described weak current inductor iron core is made by permalloy or amorphous alloy or ultramicro-crystal alloy material.
7. earth leakage protective device according to claim 1 is characterized in that: the detection loop that described weak current inductor armature winding and current limliting Resistor-Capacitor Unit are in series is connected between the ground wire of power end and the zero line or is connected between the ground wire and zero line of load end.
8. earth leakage protective device according to claim 1; it is characterized in that: also be provided with the 1st resistance, the 2nd resistance; the loop that described the 1st resistance and the 2nd resistance are in series is connected between the end and the other end of stabilized voltage power supply; the 1st resistance one end is connected with stabilized voltage power supply one end; the 1st resistance other end is connected with the 2nd resistance one end; the 2nd resistance other end is connected with the stabilized voltage power supply other end, and described reference voltage is obtained from the tie point of the 1st resistance other end and the 2nd resistance one end.
9. according to claim 1 or 8 described earth leakage protective devices, it is characterized in that: described reference voltage is sent into described voltage comparator circuit one input, and this input is the inverting input of voltage comparator circuit; Described weak current inductor secondary winding one output is connected with another input of described voltage comparator circuit, and this input is the in-phase input end of voltage comparator circuit.
10. according to claim 1 or 8 described earth leakage protective devices, it is characterized in that: described reference voltage is sent into described voltage comparator circuit one input, and this input is the in-phase input end of voltage comparator circuit; Described weak current inductor secondary winding one output is connected with another input of described voltage comparator circuit, and this input is the inverting input of voltage comparator circuit.
11. earth leakage protective device according to claim 9; it is characterized in that: described unidirectional output circuit is comprised of the 1st diode; the output of described voltage comparator circuit is connected with described the 1st diode cathode, and described the 1st diode cathode is connected with described the 1st controllable silicon trigger electrode.
12. earth leakage protective device according to claim 9; it is characterized in that: described unidirectional output circuit is comprised of the NPN triode; the output of described voltage comparator circuit is connected with described NPN transistor base; described NPN transistor emitter is connected with described the 1st controllable silicon trigger electrode, and described NPN transistor collector is connected with stabilized voltage power supply one end.
13. earth leakage protective device according to claim 10; it is characterized in that: described unidirectional output circuit is comprised of the PNP triode; the output of described voltage comparator circuit is connected with described PNP transistor base; described PNP transistor collector is connected with described the 1st controllable silicon trigger electrode, and described PNP transistor emitter is connected with stabilized voltage power supply one end.
14. earth leakage protective device according to claim 9; it is characterized in that: described unidirectional output circuit is comprised of the 2nd controllable silicon; the output of described voltage comparator circuit is connected with the 2nd controllable silicon trigger electrode, and the 2nd silicon controlled anode and negative electrode are connected in parallel with described the 1st silicon controlled anode and negative electrode respectively.
15. earth leakage protective device according to claim 1 is characterized in that: the negative pole that an end of described stabilized voltage power supply and the other end are respectively voltage stabilizing didoe is with anodal.
16. earth leakage protective device according to claim 1 is characterized in that: the output that an end of described stabilized voltage power supply and the other end are respectively three terminal regulator and ground end.
17. earth leakage protective device according to claim 2 is characterized in that: the power end that an end of described stabilized voltage power supply and the other end are respectively described amplifying circuit and ground end.
18. earth leakage protective device according to claim 1 is characterized in that: described voltage comparator circuit is voltage comparator exclusive disjunction amplifier.
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