CN102544930B - Leakage protection plug - Google Patents

Leakage protection plug Download PDF

Info

Publication number
CN102544930B
CN102544930B CN201210057399.8A CN201210057399A CN102544930B CN 102544930 B CN102544930 B CN 102544930B CN 201210057399 A CN201210057399 A CN 201210057399A CN 102544930 B CN102544930 B CN 102544930B
Authority
CN
China
Prior art keywords
resistance
photoelectrical coupler
output
input
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201210057399.8A
Other languages
Chinese (zh)
Other versions
CN102544930A (en
Inventor
刘睿刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FOSHAN SUNCUPID ELECTRONIC FACTORY Ltd
Original Assignee
FOSHAN SUNCUPID ELECTRONIC FACTORY Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FOSHAN SUNCUPID ELECTRONIC FACTORY Ltd filed Critical FOSHAN SUNCUPID ELECTRONIC FACTORY Ltd
Priority to CN201210057399.8A priority Critical patent/CN102544930B/en
Publication of CN102544930A publication Critical patent/CN102544930A/en
Application granted granted Critical
Publication of CN102544930B publication Critical patent/CN102544930B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a leakage protection plug. Electrical shock hazards caused by failures of electric appliances as well as accidental electrification of a ground wire can be prevented. A first resistance-capacitance element, a second resistance-capacitance element, a photoelectric coupler and a trigger circuit are also arranged on the leakage protection plug, wherein a detection loop which is formed by connecting the first resistance-capacitance element, one input end and the other input end of the photoelectric coupler, and the second resistance-capacitance element in series is connected between the ground wire and a zero wire; a signal output by the photoelectric coupler is sent to the input end of the trigger circuit; and the output end of the trigger circuit is connected with the control end of a driving circuit of an electromagnetic coil.

Description

A kind of leakage protecting plug
Technical field
The present invention relates to Electrical Safety resist technology field, especially relate to a kind of leakage protecting plug.
Background technology
Chinese patent literature CN1142618C discloses a kind of leakage protecting plug, on this leakage protecting plug, be not only provided with zero sequence current mutual inductor that phase line and zero line all pass, be also provided with the ground wire electrified detection inductor that ground wire passes, therefore it not only can detect between load end phase line and zero line and have or not residual current, for example, in the time there is residual current between phase, zero line and reach preset threshold values (: 10mA), it will thread off immediately in 0.1S, cuts off phase line, zero line and ground wire; And in the time that ground protection system exception causes ground wire accident charged; it can also detect load end ground wire zero accident electric current; for example, in the time that there is unexpected electric current in ground wire and reaches preset threshold values (: 10mA); it also can thread off immediately in 0.1S; cut off phase line, zero line and ground wire, thereby protected people's life security.But, for example, when it is in the time that the ground wire of ground protection system lacks (: the virtual connection of socket ground wire causes no ground) and the electric leakage of leakage protecting plug load end consuming device insulation fault, or at ground protection system exception (for example: phase line, earth short) cause ground wire unexpected when charged, dangerous voltage on the exposed metal parts band of consuming device is caused in capital, but they all do not form loop thereby also do not produce residual current or the unexpected electric current of ground wire, so, although consuming device exposed metal parts have been brought dangerous voltage, but existing leakage protecting plug can not threaded off in this case automatically, only have and in the time that people touch these exposed metal parts that band has powered on, just produce residual current or the unexpected electric current of ground wire, thereby leakage protecting plug is threaded off in 0.1S and phase line, zero line, ground wire disconnects, although threading off within the moment of 0.1S, it ensures people's safety, but in this case people be first by electricity once after earth leakage protective device could dropout power-off.So, the problem that existing leakage protecting plug still can cause people to get an electric shock.
As everyone knows, photoelectrical coupler is mainly made up of the light-emitting component of input and the photo detector of output, and light-emitting component and photo detector are arranged in same encapsulation, between light-emitting component and photo detector, carry out transmission of signal by light.Illustrated in Figure 1 is existing a kind of photoelectrical coupler 100, its input forms light-emitting component by neon lamp 100-1, its output forms photo detector by phototriode 100-2, from the characteristic of neon lamp 100-1, the voltage that neon lamp 100-1 build-up of luminance is lighted all needs 85V left and right or above just passable conventionally, hence one can see that, in the time having adopted this kind of photoelectrical coupler 100 to detect the voltage between ground wire and zero line on leakage protecting plug, just there is following shortcoming in this kind of leakage protecting plug: for example, in the time that the voltage between ground wire and zero line is low to moderate the occasion of (: 24V) below 50V, the neon lamp 100-1 that detects photoelectrical coupler 100 inside in loop just can not light by build-up of luminance, photoelectrical coupler 100 cisco unity malfunctions, cannot send signal and make leakage protecting plug tripping operation, so, the leakage protecting plug that uses this kind of photoelectrical coupler 100 to be used as detecting element is to reach the object that ensures people's Electrical Safety.
Summary of the invention
The object of the present invention is to provide a kind of leakage protecting plug that can overcome above-mentioned existing leakage protecting plug defect, it not only can be in load end phase, zero line road occurs that electric leakage or ground wire meet accident can be in time phase line contact when charged, zero line contact and ground wire contact all disconnect, and it can also will automatically thread off in the time that ground protection system occurs that the consuming device electric leakage of ground connection disappearance and leakage protecting plug load end causes electric appliance casing and latch and ground wire surprisingly to bring dangerous voltage before people or livestock touch consuming device, in time phase line, zero line and ground wire disconnect, for people provide Electrical Safety guarantee.
Technical solution proposed by the invention is such:
A kind of leakage protecting plug, include shell and latch, phase line, zero line, ground wire, zero sequence current mutual inductor, 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 the 1st rectification circuit, the 1st controllable silicon composition, one output of described zero sequence current mutual inductor secondary winding and another output are connected with another input with an input of the drive circuit of described solenoid respectively, also be provided with the 1st Resistor-Capacitor Unit, the 2nd Resistor-Capacitor Unit, photoelectrical coupler, circuits for triggering, between described ground wire and zero line, be connected with by described the 1st Resistor-Capacitor Unit, one input of described photoelectrical coupler and another input, the detection loop that described the 2nd Resistor-Capacitor Unit is in series, the signal of described photoelectrical coupler output is sent into the input of described circuits for triggering, the output of described circuits for triggering is connected with the control end of the drive circuit of described solenoid.
In described detection loop, be also provided with the 2nd rectification circuit, described the 1st Resistor-Capacitor Unit one end is connected with described ground wire, the 1st Resistor-Capacitor Unit other end is connected with the 2nd rectification circuit one input, the 2nd another input of rectification circuit is connected with the 2nd Resistor-Capacitor Unit one end, the 2nd Resistor-Capacitor Unit other end is connected with described zero line, and the 2nd rectification circuit one output is connected with another input with an input of described photoelectrical coupler respectively with another output.
In described detection loop, be also provided with the 1st diode, described the 1st diode one end is connected with described ground wire, the 1st diode other end is connected with the 1st Resistor-Capacitor Unit one end, the 1st Resistor-Capacitor Unit other end is connected with an input of photoelectrical coupler, another input of photoelectrical coupler is connected with the 2nd Resistor-Capacitor Unit one end, and the 2nd Resistor-Capacitor Unit other end is connected with described zero line.
In described detection loop, be also provided with the 2nd diode, described the 1st Resistor-Capacitor Unit other end is connected with tie point and described the 2nd diode one end of an input of described photoelectrical coupler, and described the 2nd Resistor-Capacitor Unit one end is connected with tie point and described the 2nd diode other end of another input of described photoelectrical coupler.
The the described the 1st or the 2nd Resistor-Capacitor Unit is the assembly of resistance or electric capacity or resistance and electric capacity.
In the drive circuit of described solenoid, be also 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 triggering 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.
In the drive circuit of described solenoid, be also provided with the 1st resistance, the 2nd resistance, the 3rd diode, the 1st voltage stabilizing didoe, described the 1st resistance one end is connected with described the 1st rectification circuit output end is anodal, the 1st resistance other end is connected with the 2nd resistance one end, the 2nd resistance other end is connected with the 3rd diode cathode, the 3rd diode cathode is connected with described the 1st rectification circuit output end negative pole, the 1st resistance other end is connected with tie point and the 1st voltage stabilizing didoe negative pole of the 2nd resistance one end, the 1st voltage stabilizing didoe is anodal to be connected with the 1st 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 3rd diode cathode.
Described circuits for triggering are made up of the 1st triode, the 3rd resistance, one output of described photoelectrical coupler is connected with the power end of described amplifying circuit, the collector electrode of described the 1st triode respectively, another output of described photoelectrical coupler is connected with base stage, the 3rd resistance one end of described the 1st triode respectively, the 3rd resistance other end respectively with described amplifying circuit hold, the 1st rectification circuit output end negative pole is connected, the emitter of the 1st triode is connected with described the 1st silicon controlled trigger electrode.
In the drive circuit of described solenoid, be also provided with the 2nd controllable silicon, its circuits for triggering are made up of the 1st triode, the 3rd resistance, the 4th resistance, the 2nd voltage stabilizing didoe, described the 4th resistance one end is connected with the 1st rectification circuit output end is anodal, the 4th resistance other end is connected with the 2nd voltage stabilizing didoe negative pole, the 2nd voltage stabilizing didoe is anodal to be connected with described the 1st rectification circuit output end negative pole, one output of described photoelectrical coupler respectively with described the 2nd voltage stabilizing didoe negative pole, the collector electrode of the 1st triode connects, another output of described photoelectrical coupler respectively with the base stage of described the 1st triode, the 3rd resistance one end connects, the 3rd resistance other end respectively with the 2nd voltage stabilizing didoe positive pole, the 1st rectification circuit output end negative pole connects, the emitter of described the 1st triode is connected with the 2nd controllable silicon trigger electrode, the 2nd silicon controlled anode and negative electrode the respectively with 1st silicon controlled anode and negative electrode are connected in parallel.
In the drive circuit of described solenoid, be also provided with the 2nd controllable silicon, its circuits for triggering are by the 1st triode, the 3rd resistance composition, one output of described photoelectrical coupler is connected with described the 1st voltage stabilizing didoe negative pole, another output of described photoelectrical coupler respectively with the base stage of described the 1st triode, the 3rd resistance one end connects, the 3rd resistance other end is connected with the 1st voltage stabilizing didoe is anodal, the collector electrode of the 1st triode is connected with the 1st voltage stabilizing didoe negative pole, the emitter of described the 1st triode is connected with the 2nd controllable silicon trigger electrode, the 2nd silicon controlled anode and negative electrode the respectively with 1st silicon controlled anode and negative electrode are connected in parallel.
Described circuits for triggering are by the 3rd resistance, the 5th resistance, the 6th resistance, voltage comparator circuit, one-way conduction element composition, one output of described photoelectrical coupler is connected with the power end of described amplifying circuit, another output of photoelectrical coupler respectively with the 3rd resistance one end, one input of voltage comparator circuit connects, the 3rd resistance other end is connected with the ground end of amplifying circuit, described the 5th resistance one end is connected with the power end of described amplifying circuit, the 5th resistance other end is connected with the 6th resistance one end, the 6th resistance other end is connected with the ground end of described amplifying circuit, the 5th resistance other end is connected with the tie point of the 6th resistance one end and another input of voltage comparator circuit, voltage comparator circuit output is connected with described the 1st silicon controlled trigger electrode by one-way conduction element.
In the drive circuit of described solenoid, be also provided with the 2nd controllable silicon, its circuits for triggering are by the 3rd resistance, the 5th resistance, the 6th resistance, voltage comparator circuit, the 4th resistance, the 2nd voltage stabilizing didoe composition, described the 4th resistance one end is connected with the 1st rectification circuit output end is anodal, the 4th resistance other end is connected with the 2nd voltage stabilizing didoe negative pole, the 2nd voltage stabilizing didoe is anodal to be connected with described the 1st rectification circuit output end negative pole, one output of described photoelectrical coupler is connected with described the 2nd voltage stabilizing didoe negative pole, another output of photoelectrical coupler respectively with the 3rd resistance one end, one input of voltage comparator circuit connects, the 3rd resistance other end is connected with the 2nd voltage stabilizing didoe is anodal, described the 5th resistance one end is connected with described the 2nd voltage stabilizing didoe negative pole, the 5th resistance other end is connected with the 6th resistance one end, the 6th resistance other end is connected with described the 2nd voltage stabilizing didoe is anodal, the 5th resistance other end is connected with the tie point of the 6th resistance one end and another input of voltage comparator circuit, voltage comparator circuit output is connected with the 2nd silicon controlled trigger electrode.
In the drive circuit of described solenoid, be also provided with the 2nd controllable silicon, its circuits for triggering are by the 3rd resistance, the 5th resistance, the 6th resistance, voltage comparator circuit composition, one output of described photoelectrical coupler is connected with described the 1st voltage stabilizing didoe negative pole, another output of photoelectrical coupler respectively with the 3rd resistance one end, one input of voltage comparator circuit connects, the 3rd resistance other end is connected with the 1st voltage stabilizing didoe is anodal, described the 5th resistance one end is connected with described the 1st voltage stabilizing didoe negative pole, the 5th resistance other end is connected with the 6th resistance one end, the 6th resistance other end is connected with described the 1st voltage stabilizing didoe is anodal, the 5th resistance other end is connected with the tie point of the 6th resistance one end and another input of voltage comparator circuit, voltage comparator circuit output is connected with the 2nd silicon controlled trigger electrode.
Described voltage comparator circuit is selected voltage comparator exclusive disjunction amplifier.
Described one-way conduction element is the 4th diode.
Described one-way conduction element is the 2nd triode.
At least be provided with 1 light-emitting diode in the inside of described photoelectrical coupler, at least 1 described light-emitting diode is connected in series between an input and another input of described photoelectrical coupler.
Be provided with 2 to 4 light-emitting diodes in the inside of described photoelectrical coupler, described 2 to 4 light-emitting diodes are connected between an input and another input of described photoelectrical coupler with parallel connection or series system.
Compared with prior art, the present invention has following remarkable result:
(1), leakage protecting plug of the present invention is owing to being connected with the detection loop being composed in series by Resistor-Capacitor Unit and the built-in light-emitting component of photoelectrical coupler between ground wire and zero line, when in use, once the phase of leakage protecting plug load end, for example, when the consuming device fault electric leakage on zero line and ground protection system ground wire disappearance (: the virtual connection of socket ground wire causes no ground), the metal parts that consuming device exposes and leakage protecting plug ground wire all can be brought dangerous voltage, in the time that dangerous voltage reaches predetermined value, the built-in light-emitting component of photoelectrical coupler will be shinny, the built-in light-sensitive element of photoelectrical coupler will be by this optical excitation and output signal trigger the controlled silicon conducting in the drive circuit of solenoid, thereby make the leakage protecting plug just can be in time phase line before people touch consuming device, zero line and ground wire disconnect entirely.
(2), leakage protecting plug of the present invention is owing to being connected with the detection loop being composed in series by Resistor-Capacitor Unit and the built-in light-emitting component of photoelectrical coupler between ground wire and zero line, when in use, cause ground wire surprisingly to bring dangerous voltage once ground protection system exception, the built-in light-emitting component of photoelectrical coupler will be shinny, the built-in light-sensitive element of photoelectrical coupler will be by this optical excitation and output signal trigger the controlled silicon conducting in electromagnetic coil driving circuit, thereby make the leakage protecting plug just can be in time phase line before people touch electrical equipment, zero line and ground wire disconnect entirely.
(3), leakage protecting plug of the present invention is because the detection loop that need only work as between ground wire and zero line has faint electric current to pass through; the built-in photo detector of photoelectrical coupler just has signal output; after triode or voltage comparator circuit processing, just can make solenoid thread off; so, in the time that the abnormal voltage occurring on ground wire is low to moderate 24V, also can make solenoid thread off and phase, zero, ground wire are disconnected entirely.
(4), leakage protecting plug of the present invention also can automatically be threaded off in the time of the phase line of power end and zero line reversal connection; can not reset; only have the wiring state of supply socket phase line and zero line is corrected and just can be come into operation later; forcibly standard the user side supply socket wiring requirement that must meet national regulation connect, in case there is other contingencies while using.
(5) ground wire, on leakage protecting plug of the present invention is without ground wire instrument transformer and circuits for triggering are set, thereby provides cost savings.
(6), on the detection loop of leakage protecting plug of the present invention due to by the ingenious cooperation of electric capacity or bridge rectifier and photoelectrical coupler; photoelectricity transmission efficiency, the sensitivity of photoelectrical coupler are effectively improved; the requirement that detects the current signal on loop to flowing through reduces greatly; improve the impedance between ground wire and zero line, made it meet the requirement of safety standard.
(7), on the detection loop of leakage protecting plug of the present invention due to by increasing the light-emitting diode of photoelectrical coupler inside; make these light-emitting diodes parallel connections or be connected in series between photoelectrical coupler input; thereby the photoelectricity transmission efficiency, the sensitivity that effectively improve photoelectrical coupler; the requirement that detects the current signal on loop to flowing through reduces greatly; improve the impedance between ground wire and zero line, made it meet the requirement of safety standard.
Leakage protecting plug of the present invention is mainly used in the earth leakage protective of various household electrical appliance.
Accompanying drawing explanation
Fig. 1 is the circuit structure principle schematic of existing a kind of photoelectrical coupler.
Fig. 2 is the leakage protecting plug electrical principle schematic diagram of the 1st embodiment of the present invention.
Fig. 3 is the leakage protecting plug electrical principle schematic diagram of the 2nd embodiment of the present invention.
Fig. 4 is the leakage protecting plug electrical principle schematic diagram of the 3rd embodiment of the present invention.
Fig. 5 is the leakage protecting plug electrical principle schematic diagram of the 4th embodiment of the present invention.
Fig. 6 is the leakage protecting plug electrical principle schematic diagram of the 5th embodiment of the present invention.
Fig. 7 is the leakage protecting plug electrical principle schematic diagram of the 6th embodiment of the present invention.
Fig. 8 is the leakage protecting plug electrical principle schematic diagram of the 7th embodiment of the present invention.
Fig. 9 is the leakage protecting plug electrical principle schematic diagram of the 8th embodiment of the present invention.
Figure 10 is the leakage protecting plug electrical principle schematic diagram of the 9th embodiment of the present invention.
Embodiment
By embodiment below, the present invention is further elaborated.
Embodiment 1
Shown in Figure 2; a kind of leakage protecting plug; mainly by phase line 8 and zero line 9 and ground wire 10, zero sequence current mutual inductor 15, test loop 16, electromagnetic trip and the locker of the phase line 5 of shell and latch, power end and zero line 6 and ground wire 7, load end; this electromagnetic trip and locker comprise solenoid 11 and drive circuit, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, spring, reset push rod, and the 1st Resistor-Capacitor Unit the 17, the 2nd Resistor-Capacitor Unit 18, photoelectrical coupler 19, circuits for triggering composition.Between ground wire 7 and zero line 6, be connected with the detection loop being in series by an input and another input, the 2nd Resistor-Capacitor Unit 18 of the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19, one output of photoelectrical coupler 19 and another output respectively with the drive circuit of solenoid 11 in power end be connected with the input of circuits for triggering, the output of circuits for triggering is connected with the control end of the drive circuit of solenoid 11.
In the present embodiment, the drive circuit of described solenoid 11 is mainly made up of the 1st rectification circuit the 12, the 1st controllable silicon 13, amplifying circuit 14, one output of described zero sequence current mutual inductor 15 secondary winding is connected with another input with an input of described amplifying circuit 14 respectively with another output, and amplifying circuit 14 triggers the signal of output output and sends into the 1st controllable silicon 13 trigger electrodes.
In the present embodiment, circuits for triggering select the 1st triode the 20, the 3rd resistance 32 to form, and also can select voltage comparator circuit, resistance, one-way conduction element composition.
In the present embodiment, by the 1st Resistor-Capacitor Unit 17, one input of photoelectrical coupler 19 and another input, the detection loop that the 2nd Resistor-Capacitor Unit 18 is in series is connected between the ground wire 7 and zero line 6 of power end, one end of described the 1st Resistor-Capacitor Unit 17 is connected with ground wire, the other end of the 1st Resistor-Capacitor Unit 17 is connected with an input of photoelectrical coupler 19, another input of photoelectrical coupler 19 is connected with one end of the 2nd Resistor-Capacitor Unit 18, the other end of the 2nd Resistor-Capacitor Unit 18 is connected with zero line 6, one output of photoelectrical coupler 19 is connected with the power end (+VS) of amplifying circuit 14, another output of photoelectrical coupler 19 respectively with the 3rd resistance 32 one end, the base stage of the 1st triode 20 connects, the other end of the 3rd resistance 32 respectively with the 1st rectification circuit 12 negative pole of output end (-), the ground end (GND) of amplifying circuit 14, the collector electrode of the 1st triode 20 is connected with the power end (+VS) of amplifying circuit 14, the emitter of the 1st triode 20 is connected with the trigger electrode of the 1st controllable silicon 13, the anode of the 1st controllable silicon 13 is connected with negative pole (-) with the positive pole (+) of negative electrode the respectively with 1st rectification circuit 12 outputs.
In the present embodiment, the 1st Resistor-Capacitor Unit 17 is electric capacity, and the 1st Resistor-Capacitor Unit 17 also can adopt the assembly of resistance or resistance and electric capacity; The 2nd Resistor-Capacitor Unit 18 is resistance, and the 2nd Resistor-Capacitor Unit 18 also can adopt the assembly of electric capacity or resistance and electric capacity.
In the present embodiment, the inside of photoelectrical coupler 19 is provided with the light-emitting component of 2 light-emitting diodes as photoelectrical coupler, these 2 light-emitting diodes are connected in parallel between an input and another input of photoelectrical coupler 19, thereby make no matter photoelectrical coupler 19 is the positive half wave at signal, or in the time of the negative half-wave of signal, all there is lumination of light emitting diode photoelectrical coupler 19 inside, thereby have improved widely photoelectricity transmission efficiency and the sensitivity of photoelectrical coupler 19.
In the present embodiment, the detection loop that an input by the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 are in series is connected between the ground wire 7 and zero line 6 of power end, also this detection loop can be connected between the ground wire 10 and zero line 9 of load end.
When use, the reset push rod of leakage protecting plug 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 clamped at zero volt left and right because the effect of ground connection makes voltage, zero line 6 and 9 is also in zero volt left and right simultaneously, be connected to like this between the ground wire 7 of leakage protecting plug power end and zero line 6 by the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19 1 inputs and another input, the detection loop that the 2nd Resistor-Capacitor Unit 18 forms does not just have the electric current that electric current flows through or flows through not reach preset threshold values (for example: 10 microamperes), the output of photoelectrical coupler 19 does not have signal to export to the base stage of the 1st triode 20, the 1st triode 20 ends, the 1st controllable silicon 13 ends, leakage protecting plug just remains on reset "on" position like this, thereby for the consuming device of its lower end is powered and ground connection is provided.
For example, when ground protection system extremely (: phase occurs, ground short circuit causes the ground wire unexpected charged) while causing ground wire 7 and 10 accidents to bring dangerous voltage, be connected to like this between the ground wire 7 of power end and zero line 6 by the 1st Resistor-Capacitor Unit 17, one input of photoelectrical coupler 19 and another input, the detection loop that the 2nd Resistor-Capacitor Unit 18 forms just has an electric current to flow through, the lumination of light emitting diode of photoelectrical coupler 19 inside, thereby exciting light electric coupling 19 makes its output output signal to the base stage of the 1st triode 20 and makes the 1st triode 20 conductings, the 1st controllable silicon 13 be triggered conducting and make leakage protecting plug thread 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 ensure better people's Electrical Safety.
When the phase line 8 of load end, consuming device fault on zero line 9 electric leakage and in the normal situation of ground protection system time, can produce a residual current through ground wire 10 and 7, zero sequence current mutual inductor 15 can detect phase, residual current between zero line is also exported a signal to amplifying circuit 14, and for example, in the time that residual current reaches preset threshold values (: 10 milliamperes), amplifying circuit 14 triggers output output signal, the 1st triode 20 oppositely ends, the conducting that is triggered of the 1st controllable silicon 13, leakage protecting plug 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 zero line 9 electric leakage and for example, when ground protection system no ground (: on socket, ground wire virtual connection causes no ground), the metal parts that consuming device exposes and leakage protecting plug ground wire 10 and 7 all can be brought dangerous voltage, be connected between leakage protecting plug power end ground wire 7 and zero line 6 by the 1st Resistor-Capacitor Unit 17, one input of photoelectrical coupler 19 and another input, the detection loop that the 2nd Resistor-Capacitor Unit 18 forms just has an electric current to flow through, the lumination of light emitting diode of photoelectrical coupler 19 inside, thereby exciting light electric coupling 19 makes its output output signal to the base stage of the 1st triode 20 and makes the 1st triode 20 conductings, be triggered conducting leakage protecting plug of the 1st controllable silicon 13 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 ensure better people's Electrical Safety.
Embodiment 2
Shown in Figure 3, the present embodiment is compared with embodiment 1, and the present embodiment has increased by the 2nd rectification circuit 22.
In the present embodiment, formed and detected loop and be connected between the ground wire 7 and zero line 6 of power end by an input and another input, the 2nd Resistor-Capacitor Unit 18 of an input of the 1st Resistor-Capacitor Unit the 17, the 2nd rectification circuit 22 and another input, photoelectrical coupler 19, an output of the 2nd rectification circuit 22 is connected with another input with an input of photoelectrical coupler 19 respectively with another output.
In the present embodiment, the 1st Resistor-Capacitor Unit 17 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity; The 2nd Resistor-Capacitor Unit 18 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity.
In the present embodiment, the inside of photoelectrical coupler 19 is provided with 1 light-emitting diode, also can be at 2 to 4 light-emitting diodes of the internal series-connection of photoelectrical coupler 19 between the input and another input at photoelectrical coupler 19.
In the present embodiment, an input by the 1st Resistor-Capacitor Unit the 17, the 2nd rectification circuit 22 and another input, an input of photoelectrical coupler 19 and the detection loop that another input, the 2nd Resistor-Capacitor Unit 18 are in series are connected between the ground wire 7 and zero line 6 of power end, also this detection loop can be connected between the ground wire 10 and zero line 9 of load end.
In the present embodiment, circuits for triggering select the 1st triode the 20, the 3rd resistance 32 to form, and also can select by voltage comparator circuit, resistance, one-way conduction element and form.
Because the present embodiment is compared with embodiment 1, only different for being located at detection loop between ground wire 7 and zero line 6, remaining structure forms all identical with embodiment 1 with circuit theory, does not repeat them here.
Embodiment 3
Shown in Figure 4, the present embodiment is compared with embodiment 2, and the present embodiment has increased by the 1st diode 23, and has cancelled the 2nd rectification circuit 22 in embodiment 2.
In the present embodiment, forming detection loop by an input and another input, the 2nd Resistor-Capacitor Unit 18 of the 1st diode the 23, the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19 is connected between the ground wire 7 and zero line 6 of power end, one end of the 1st diode 23 is connected with ground wire 7, the other end of the 1st diode 23 is connected with the 1st Resistor-Capacitor Unit 17 one end, the other end of the 1st Resistor-Capacitor Unit 17 is connected with an input of photoelectrical coupler 19, another input of photoelectrical coupler 19 is connected with one end of the 2nd Resistor-Capacitor Unit 18, and the other end of the 2nd Resistor-Capacitor Unit 18 is connected with zero line 6.
In the present embodiment, the 1st Resistor-Capacitor Unit 17 is electric capacity, also can adopt the assembly of electric capacity or resistance and electric capacity; The 2nd Resistor-Capacitor Unit 18 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity.
In the present embodiment, the inside of photoelectrical coupler 19 is provided with between the input and another input that 2 light-emitting diodes are connected in series in photoelectrical coupler 19.
In the present embodiment, an input by the 1st diode the 23, the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19 and detection loop that another input, the 2nd Resistor-Capacitor Unit 18 are in series are connected between the ground wire 7 and zero line 6 of power end, also this detection loop can be connected between the ground wire 10 and zero line 9 of load end.
In the present embodiment, circuits for triggering select the 1st triode the 20, the 3rd resistance 32 to form, and also can select by voltage comparator circuit, resistance, one-way conduction element and form.
Because the present embodiment is compared with embodiment 2, only different for being located at detection loop between ground wire 7 and zero line 6, remaining structure forms all identical with embodiment 2 with circuit theory, does not repeat them here.
Embodiment 4
Shown in Figure 5, the present embodiment, compared with embodiment 1, has increased by the 2nd diode the 24, the 4th resistance the 33, the 2nd voltage stabilizing didoe the 28, the 2nd controllable silicon 29, and has cancelled the amplifying circuit 14 in embodiment 1 in the present embodiment.
In the present embodiment, by the 1st Resistor-Capacitor Unit 17, one input of photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 compositions detect loop and are connected between the ground wire 7 and zero line 6 of power end, one end of the 1st Resistor-Capacitor Unit 17 is connected with ground wire 7, the other end of the 1st Resistor-Capacitor Unit 17 is connected with an input of photoelectrical coupler 19, another input of photoelectrical coupler 19 is connected with one end of the 2nd Resistor-Capacitor Unit 18, the other end of the 2nd Resistor-Capacitor Unit 18 is connected with zero line 6, one end of the 2nd diode 24 is connected with one end of photoelectrical coupler 19, the other end of the 2nd diode 24 is connected with the other end of photoelectrical coupler 19, the 4th resistance 33 one end are connected with the positive pole (+) of the 1st rectification circuit 12 outputs, the 4th resistance 33 other ends respectively with the 2nd voltage stabilizing didoe 28 negative poles, photoelectrical coupler 19 1 outputs, the collector electrode of the 1st triode 20 connects, another output of photoelectrical coupler 19 is connected with the base stage of the 1st triode 20, the emitter of the 1st triode 20 is connected with the trigger electrode of the 2nd controllable silicon 29, the anode of the 2nd controllable silicon 29 and negative electrode the respectively with 1st silicon controlled anode and negative electrode are connected in parallel.
In the present embodiment, the 1st Resistor-Capacitor Unit 17 is electric capacity, also can adopt the assembly of electric capacity or resistance and electric capacity; The 2nd Resistor-Capacitor Unit 18 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity.
In the present embodiment, the inside of photoelectrical coupler 19 is provided with 1 light-emitting diode, also can be provided with between the input and another input that 2 to 4 light-emitting diodes are connected in series in photoelectrical coupler 19 inside.
In the present embodiment, the detection loop that an input by the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 are in series is connected between the ground wire 7 and zero line 6 of power end, also this detection loop can be connected between the ground wire 10 and zero line 9 of load end.
In the present embodiment, circuits for triggering select the 1st triode the 20, the 3rd resistance 32 to form, also optional with voltage comparator circuit, resistance, one-way conduction element composition.
Because the present embodiment is compared with embodiment 1, only different for being located at the drive circuit of detection loop between ground wire 7 and zero line 6 and solenoid 11, remaining structure forms all identical with embodiment 1 with circuit theory, does not repeat them here.
Embodiment 5
Shown in Figure 6, a kind of leakage protecting plug, mainly by shell and latch, phase line 5 and zero line 6 and the ground wire 7 of power end, phase line 8 and zero line 9 and the ground wire 10 of load end, zero sequence current mutual inductor 15, test loop 16, electromagnetic trip and locker, this electromagnetic trip and locker comprise 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, reset push rod, and the 1st Resistor-Capacitor Unit 17, the 2nd Resistor-Capacitor Unit 18, photoelectrical coupler 19, the 2nd rectification circuit 22, the 3rd resistance 32, the 5th resistance 34, the 6th resistance 35, voltage comparator circuit 36, the 4th diode 26 forms.
In the present embodiment, the drive circuit of described solenoid 11 is mainly made up of the 1st rectification circuit the 12, the 1st controllable silicon 13, amplifying circuit 14, one output of described zero sequence current mutual inductor 15 secondary winding is connected with another input with an input of described amplifying circuit 14 respectively with another output, and amplifying circuit 14 triggers the signal of output output and sends into the 1st controllable silicon 13 trigger electrodes.
In the present embodiment, voltage comparator circuit 36 is voltage comparator, also can adopt operational amplifier.
In the present embodiment, one-way conduction element is the 4th diode 26, also can adopt triode.
In the present embodiment, by the 1st Resistor-Capacitor Unit 17, the 2nd rectification circuit 22, one input of photoelectrical coupler 19 and another input, the detection loop that the 2nd Resistor-Capacitor Unit 18 is in series is connected between the ground wire 7 and zero line 6 of power end, one end of described the 1st Resistor-Capacitor Unit 17 is connected with ground wire, the other end of the 1st Resistor-Capacitor Unit 17 is connected with an input of the 2nd rectification circuit 22, another input of the 2nd rectification circuit 22 is connected with one end of the 2nd Resistor-Capacitor Unit 18, the other end of the 2nd Resistor-Capacitor Unit 18 is connected with zero line 6, one output of the 2nd rectification circuit 22 is connected with another input with an input of photoelectrical coupler 19 respectively with another output, one output of photoelectrical coupler 19 is connected with the power end (+VS) of amplifying circuit 14, another output of photoelectrical coupler 19 respectively with the 3rd resistance 32 one end, voltage comparator circuit 36 1 inputs (+) connect, the other end of the 3rd resistance 32 respectively with the 1st rectification circuit 12 negative pole of output end (-), the ground end (GND) of amplifying circuit 14 connects, the power end (+VS) of one end amplifying circuit 14 of the 5th resistance 34 connects, the other end of the 5th resistance 34 is connected with one end of the 6th resistance 35, the other end of the 6th resistance 35 is connected with the ground end (GND) of amplifying circuit 14, the other end of the 5th resistance 34 is also connected with another input (-) of voltage comparator circuit 36 with the tie point of one end of the 6th resistance 35, the output of voltage comparator circuit 36 is connected with one end of the 4th diode 26, the 4th diode 26 other ends are connected with the trigger electrode of the 1st controllable silicon 13, the anode of the 1st controllable silicon 13 is connected with negative pole (-) with the positive pole (+) of negative electrode the respectively with 1st rectification circuit 12 outputs.
In the present embodiment, the 1st Resistor-Capacitor Unit 17 is resistance, and the 1st Resistor-Capacitor Unit 17 also can adopt the assembly of electric capacity or resistance and electric capacity; The 2nd Resistor-Capacitor Unit 18 is resistance, and the 2nd Resistor-Capacitor Unit 18 also can adopt the assembly of electric capacity or resistance and electric capacity.
In the present embodiment, the inside of photoelectrical coupler 19 is provided with the light-emitting component of 1 light-emitting diode as photoelectrical coupler 19, no matter when the positive half wave of signal because the effect of the 2nd rectification circuit 22 makes the light-emitting diode of photoelectrical coupler 19 inside, or in the time of the negative half-wave of signal, the light-emitting diode of photoelectrical coupler 19 inside all can be luminous, thereby improve widely the photoelectricity transmission efficiency of photoelectrical coupler 19, sensitivity, in addition, the sensitivity that can also improve photoelectrical coupler between an input of photoelectrical coupler 19 and another input by 2 to 4 light-emitting diodes of the internal series-connection at photoelectrical coupler 19, so that when the electric current on satisfied detection loop is very faint, photoelectrical coupler 19 also can output signal make leakage protecting plug tripping operation.
In the present embodiment, an input by the 1st Resistor-Capacitor Unit the 17, the 2nd rectification circuit 22, photoelectrical coupler 19 and detection loop that another input, the 2nd Resistor-Capacitor Unit 18 are in series are connected between the ground wire 7 and zero line 6 of power end, also this detection loop can be connected between the ground wire 10 and zero line 9 of load end.
When use, the reset push rod of leakage protecting plug 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 clamped at zero volt left and right because the effect of ground connection makes voltage, zero line 6 and 9 is also in zero volt left and right simultaneously, be connected to like this between the ground wire 7 of leakage protecting plug power end and zero line 6 by the 1st Resistor-Capacitor Unit 17, the 2nd rectification circuit 22, photoelectrical coupler 19 1 inputs and another input, the detection loop that the 2nd Resistor-Capacitor Unit 18 forms does not just have the electric current that electric current flows through or flows through not reach preset threshold values (for example: 10 microamperes), the output of photoelectrical coupler 19 does not have signal to export to an input (+) of voltage comparator circuit 36, the signal voltage of exporting to an input (+) of voltage comparator circuit 36 due to photoelectrical coupler 19 is less than the reference voltage to another input (-) of voltage comparator circuit 36 by the 5th resistance 34 and the 6th resistance 35 dividing potential drops, so voltage comparator circuit 36 outputs are just maintained low-voltage, the 4th diode 26 ends, the 1st controllable silicon 13 ends, leakage protecting plug just remains on reset "on" position like this, thereby for the consuming device of its lower end is powered and ground connection is provided.
For example, when ground protection system extremely (: phase occurs, ground short circuit causes the ground wire unexpected charged) while causing ground wire 7 and 10 accidents to bring dangerous voltage, be connected to like this between the ground wire 7 of power end and zero line 6 by the 1st Resistor-Capacitor Unit 17, the 2nd rectification circuit 22, one input of photoelectrical coupler 19 and another input, the detection loop that the 2nd Resistor-Capacitor Unit 18 forms just has an electric current to flow through, the lumination of light emitting diode of photoelectrical coupler 19 inside, thereby exciting light electric coupling 19 makes it output signal to an input (+) of voltage comparator circuit 36, in the time that this signal is greater than by the 5th resistance 34 and the 6th resistance 35 dividing potential drops to the reference voltage of another input (-) of voltage comparator circuit 36, voltage comparator circuit 36 outputs become high voltage, the 4th diode 26 conductings, the 1st controllable silicon 13 be triggered conducting and make leakage protecting plug thread 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 ensure better people's Electrical Safety.
When the phase line 8 of load end, consuming device fault on zero line 9 electric leakage and in the normal situation of ground protection system time, can produce a residual current through ground wire 10 and 7, zero sequence current mutual inductor 15 can detect phase, residual current between zero line is also exported a signal to amplifying circuit 14, and for example, in the time that residual current reaches preset threshold values (: 10 milliamperes), amplifying circuit 14 triggers output output signal, the 4th diode 26 oppositely ends, the conducting that is triggered of the 1st controllable silicon 13, leakage protecting plug 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 zero line 9 electric leakage and for example, when ground protection system no ground (: on socket, ground wire virtual connection causes no ground), the metal parts that consuming device exposes and leakage protecting plug ground wire 10 and 7 all can be brought dangerous voltage, be connected between leakage protecting plug power end ground wire 7 and zero line 6 by the 1st Resistor-Capacitor Unit 17, the 2nd rectification circuit 22, one input of photoelectrical coupler 19 and another input, the detection loop that the 2nd Resistor-Capacitor Unit 18 forms just has an electric current to flow through, the lumination of light emitting diode of photoelectrical coupler 19 inside, thereby exciting light electric coupling 19 makes it output signal to an input (+) of voltage comparator circuit 36, in the time that this signal is greater than by the 5th resistance 34 and the 6th resistance 35 dividing potential drops to the reference voltage of another input (-) of voltage comparator circuit 36, voltage comparator circuit 36 outputs become high voltage, the 4th diode 26 conductings, the 1st controllable silicon 13 be triggered conducting and make leakage protecting plug thread 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 ensure better people's Electrical Safety.
Embodiment 6
Shown in Figure 7, the present embodiment, compared with embodiment 5, has increased by the 2nd controllable silicon 29 in the drive circuit of the solenoid 11 of the present embodiment, and has cancelled the amplifying circuit 14 described in embodiment 5; In the circuits for triggering of the present embodiment, increase the 4th resistance 33 and the 2nd voltage stabilizing didoe 28, and cancelled the 4th diode 26 described in embodiment 5.
In the present embodiment, the drive circuit of solenoid 11 is mainly made up of the 1st rectification circuit the 12, the 1st controllable silicon the 13, the 2nd controllable silicon 29, one output of zero sequence current mutual inductor 15 is connected with negative electrode with the trigger electrode of another output the respectively with 1st controllable silicon 13, the anode of the 1st controllable silicon 13 is connected with negative pole (-) with the positive pole (+) of negative electrode the respectively with 1st rectification circuit 12 outputs, and the anode of the 2nd controllable silicon 29 is connected with negative electrode with the anode of negative electrode the respectively with 1st controllable silicon 13.
In the present embodiment, by the 1st Resistor-Capacitor Unit 17, one input of photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 compositions detect loop and are connected between the ground wire 7 and zero line 6 of power end, one end of the 1st Resistor-Capacitor Unit 17 is connected with ground wire 7, the other end of the 1st Resistor-Capacitor Unit 17 is connected with an input of photoelectrical coupler 19, another input of photoelectrical coupler 19 is connected with one end of the 2nd Resistor-Capacitor Unit 18, the other end of the 2nd Resistor-Capacitor Unit 18 is connected with zero line 6, one end of the 2nd diode 24 respectively with one end of photoelectrical coupler 19, the other end of the 1st Resistor-Capacitor Unit 17 connects, the other end of the 2nd diode 24 respectively with the other end of photoelectrical coupler 19, one end of the 2nd Resistor-Capacitor Unit 18 connects, the 4th resistance 33 one end are connected with the positive pole (+) of the 1st rectification circuit 12 outputs, the other end of the 4th resistance 33 respectively with the 2nd voltage stabilizing didoe 28 negative poles, the 5th resistance 34 one end, one output of photoelectrical coupler 19 connects, the 2nd voltage stabilizing didoe 28 positive poles are connected with the negative pole of output end (-) of the 1st rectification circuit 12, another output of photoelectrical coupler 19 respectively with the 3rd resistance 32 one end, one input (+) of voltage comparator circuit 36 connects, the 3rd resistance 32 other ends are connected with the 2nd voltage stabilizing didoe 28 positive poles, the 5th resistance 34 other ends respectively with the 6th resistance 35 one end, another input (-) of voltage comparator circuit 36 connects, the 6th resistance 36 other ends are connected with the 2nd voltage stabilizing didoe 28 positive poles, the output of voltage comparator circuit 36 is connected with the trigger electrode of the 2nd controllable silicon 29.
In the present embodiment, the 1st Resistor-Capacitor Unit 17 is electric capacity, also can adopt the assembly of electric capacity or resistance and electric capacity; The 2nd Resistor-Capacitor Unit 18 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity.
In the present embodiment, the inside of photoelectrical coupler 19 is provided with 1 light-emitting diode, also can be provided with 2 to 4 light-emitting diodes and be connected between an input and another input of photoelectrical coupler 19 in the mode of serial or parallel connection.
In the present embodiment, the detection loop that an input by the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 are in series is connected between the ground wire 7 and zero line 6 of power end, also this detection loop can be connected between the ground wire 10 and zero line 9 of load end.
In the present embodiment, circuits for triggering select the 3rd resistance the 32, the 5th resistance the 34, the 6th resistance 35, voltage comparator circuit 36, the 4th resistance the 33, the 2nd voltage stabilizing didoe 28 to form.
In the present embodiment, voltage comparator circuit 36 is voltage comparator, also can adopt operational amplifier.
Because the present embodiment is compared with embodiment 5, only different for being located at the drive circuit of detection loop between ground wire 7 and zero line 6, solenoid 11, remaining structure forms all identical with embodiment 5 with circuit theory, does not repeat them here.
Embodiment 7
Shown in Figure 8, the present embodiment is compared with embodiment 6, and the present embodiment has increased by the 1st resistance the 30, the 2nd resistance the 31, the 3rd diode the 25, the 1st voltage stabilizing didoe 27, and has cancelled the 4th resistance 33 and the 2nd voltage stabilizing didoe 28 described in embodiment 6.
In the present embodiment, the drive circuit of solenoid 11 is mainly by the 1st rectification circuit 12, the 1st controllable silicon 13, the 1st resistance 30, the 2nd resistance 31, the 3rd diode 25, the 1st voltage stabilizing didoe 27, the 2nd controllable silicon 29 forms, the 1st resistance 30 one end are connected with the output head anode (+) of the 1st rectification circuit 12, the 1st resistance 30 other ends respectively with the 2nd resistance 31 one end, the 1st voltage stabilizing didoe 27 negative poles connect, the 2nd resistance 31 other ends are connected with the 3rd diode 25 positive poles, the 3rd diode 25 negative poles respectively with the negative pole of output end (-) of the 1st rectification circuit 12, the anodal connection of the 1st voltage stabilizing didoe 27, the trigger electrode of one output of zero sequence current mutual inductor 15 and another output the respectively with 1st controllable silicon 13, the anodal connection of the 3rd diode 25, the anode of the 1st controllable silicon 13 is connected with negative pole (-) with the positive pole (+) of negative electrode the respectively with 1st rectification circuit 12 outputs, the anode of the 2nd controllable silicon 29 is connected with negative electrode with the anode of negative electrode the respectively with 1st controllable silicon 13.
In the present embodiment, by the 1st Resistor-Capacitor Unit 17, one input of photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 compositions detect loop and are connected between the ground wire 7 and zero line 6 of power end, one end of the 1st Resistor-Capacitor Unit 17 is connected with ground wire 7, the other end of the 1st Resistor-Capacitor Unit 17 is connected with an input of photoelectrical coupler 19, another input of photoelectrical coupler 19 is connected with one end of the 2nd Resistor-Capacitor Unit 18, the other end of the 2nd Resistor-Capacitor Unit 18 is connected with zero line 6, one end of the 2nd diode 24 respectively with one end of photoelectrical coupler 19, the other end of the 1st Resistor-Capacitor Unit 17 connects, the other end of the 2nd diode 24 respectively with the other end of photoelectrical coupler 19, one end of the 2nd Resistor-Capacitor Unit 18 connects, one output of photoelectrical coupler 19 respectively with the 1st voltage stabilizing didoe 27 negative poles, the 5th resistance 34 one end connect, another output of photoelectrical coupler 19 respectively with the 3rd resistance 32 one end, one input (+) of voltage comparator circuit 36 connects, the 3rd resistance 32 other ends respectively with the 1st voltage stabilizing didoe 27 positive poles, the negative pole of output end (-) of the 1st rectification circuit 12 connects, the 5th resistance 34 other ends respectively with the 6th resistance 35 one end, voltage comparator circuit 36 another inputs (-) connect, the 6th resistance 35 other ends respectively with the 1st voltage stabilizing didoe 27 positive poles, the negative pole of output end (-) of the 1st rectification circuit 12 connects, the output of voltage comparator circuit 36 is connected with the trigger electrode of the 2nd controllable silicon 29.
In the present embodiment, the 1st Resistor-Capacitor Unit 17 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity; The 2nd Resistor-Capacitor Unit 18 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity.
In the present embodiment, the inside of photoelectrical coupler 19 is provided with between the input and another input that 2 light-emitting diodes are connected in series in photoelectrical coupler 19.
In the present embodiment, the detection loop that an input by the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 are in series is connected between the ground wire 7 and zero line 6 of power end, also this detection loop can be connected between the ground wire 10 and zero line 9 of load end.
In the present embodiment, circuits for triggering select the 3rd resistance the 32, the 5th resistance the 34, the 6th resistance 35, voltage comparator circuit 36 to form.
In the present embodiment, voltage comparator circuit 36 is voltage comparator, also can adopt operational amplifier.
Because the present embodiment is compared with embodiment 6, only different for being located at the drive circuit of detection loop between ground wire 7 and zero line 6, solenoid 11, remaining structure forms all identical with embodiment 6 with circuit theory, does not repeat them here.
Embodiment 8
Shown in Figure 9, the present embodiment is compared with embodiment 5, and the present embodiment has increased by the 2nd triode 21, and has cancelled the 4th diode 26 and the 2nd rectification circuit 22 described in embodiment 5.
In the present embodiment, by the 1st Resistor-Capacitor Unit 17, one input of photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 compositions detect loop and are connected between the ground wire 7 and zero line 6 of power end, one end of the 1st Resistor-Capacitor Unit 17 is connected with ground wire 7, the other end of the 1st Resistor-Capacitor Unit 17 is connected with an input of photoelectrical coupler 19, another input of photoelectrical coupler 19 is connected with one end of the 2nd Resistor-Capacitor Unit 18, the other end of the 2nd Resistor-Capacitor Unit 18 is connected with zero line 6, one output of photoelectrical coupler 19 respectively with the power end (+VS) of amplifying circuit 14, the 5th resistance 34 one end, the collector electrode of the 2nd triode 21 connects, another output of photoelectrical coupler 19 respectively with the 3rd resistance 32 one end, one input (+) of voltage comparator circuit 36 connects, the 3rd resistance 32 other ends respectively with the ground end (GND) of amplifying circuit 14, the negative pole of output end (-) of the 1st rectification circuit 12 connects, the 5th resistance 34 other ends respectively with the 6th resistance 35 one end, voltage comparator circuit 36 another inputs (-) connect, the 6th resistance 35 other ends are connected with the negative pole of output end (-) of the 1st rectification circuit 12, the output of voltage comparator circuit 36 is connected with the base stage of the 2nd triode 21, the emitter of the 2nd triode is connected with the trigger electrode of the 1st controllable silicon 13.
In the present embodiment, the 1st Resistor-Capacitor Unit 17 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity; The 2nd Resistor-Capacitor Unit 18 is resistance, also can adopt the assembly of electric capacity or resistance and electric capacity.
In the present embodiment, the inside of photoelectrical coupler 19 is provided with between the input and another input that 2 light-emitting diodes are connected in photoelectrical coupler 19 in parallel.
In the present embodiment, the detection loop that an input by the 1st Resistor-Capacitor Unit 17, photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 are in series is connected between the ground wire 7 and zero line 6 of power end, also this detection loop can be connected between the ground wire 10 and zero line 9 of load end.
In the present embodiment, circuits for triggering select the 3rd resistance the 32, the 5th resistance the 34, the 6th resistance 35, voltage comparator circuit 36, the 2nd triode 21 to form.
In the present embodiment, voltage comparator circuit 36 is voltage comparator, also can adopt operational amplifier.
Because the present embodiment is compared with embodiment 5, only different for being located at the one-way conduction element detecting between ground wire 7 and zero line 6 in loop, circuits for triggering, remaining structure forms all identical with embodiment 5 with circuit theory, does not repeat them here.
Embodiment 9
Shown in Figure 10, the present embodiment, compared with embodiment 7, has increased by the 1st triode 20 in the present embodiment, and has cancelled the 5th resistance the 34, the 6th resistance 36 and voltage comparator circuit 36 described in embodiment 7.
In the present embodiment, the drive circuit of solenoid 11 is mainly by the 1st rectification circuit 12, the 1st controllable silicon 13, the 1st resistance 30, the 2nd resistance 31, the 3rd diode 25, the 1st voltage stabilizing didoe 27, the 2nd controllable silicon 29 forms, the 1st resistance 30 one end are connected with the output head anode (+) of the 1st rectification circuit 12, the 1st resistance 30 other ends respectively with the 2nd resistance 31 one end, the 1st voltage stabilizing didoe 27 negative poles connect, the 2nd resistance 31 other ends are connected with the 3rd diode 25 positive poles, the 3rd diode 25 negative poles respectively with the negative pole of output end (-) of the 1st rectification circuit 12, the anodal connection of the 1st voltage stabilizing didoe 27, the trigger electrode of one output of zero sequence current mutual inductor 15 and another output the respectively with 1st controllable silicon 13, the anodal connection of the 3rd diode 25, the anode of the 1st controllable silicon 13 is connected with negative pole (-) with the positive pole (+) of negative electrode the respectively with 1st rectification circuit 12 outputs, the anode of the 2nd controllable silicon 29 is connected with negative electrode with the anode of negative electrode the respectively with 1st controllable silicon 13.
In the present embodiment, by the 1st Resistor-Capacitor Unit 17, one input of photoelectrical coupler 19 and another input, the 2nd Resistor-Capacitor Unit 18 compositions detect loop and are connected between the ground wire 7 and zero line 6 of power end, one end of the 1st Resistor-Capacitor Unit 17 is connected with ground wire 7, the other end of the 1st Resistor-Capacitor Unit 17 is connected with an input of photoelectrical coupler 19, another input of photoelectrical coupler 19 is connected with one end of the 2nd Resistor-Capacitor Unit 18, the other end of the 2nd Resistor-Capacitor Unit 18 is connected with zero line 6, one end of the 2nd diode 24 respectively with one end of photoelectrical coupler 19, the other end of the 1st Resistor-Capacitor Unit 17 connects, the other end of the 2nd diode 24 respectively with the other end of photoelectrical coupler 19, one end of the 2nd Resistor-Capacitor Unit 18 connects, one output of photoelectrical coupler 19, the 1st triode 20 collector electrodes are connected with the 1st voltage stabilizing didoe 27 negative poles respectively, another output of photoelectrical coupler 19 and the 3rd resistance 32 one end, the base stage of the 1st triode 20 connects, the 3rd resistance 32 other ends respectively with the 1st voltage stabilizing didoe 27 positive poles, the negative pole of output end (-) of the 1st rectification circuit 12 connects, the emitter of the 1st triode 20 is connected with the trigger electrode of the 2nd controllable silicon 29.
In the present embodiment, circuits for triggering select the 1st triode the 20, the 3rd resistance 32 to form.
Because the present embodiment is compared with embodiment 7, only for the circuits for triggering that are connected with photoelectrical coupler 19 are different, remaining structure composition is all identical with embodiment 7 with circuit theory, does not repeat them here.

Claims (20)

1. a leakage protecting plug, include shell and latch, phase line, zero line, ground wire, zero sequence current mutual inductor, 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 the 1st rectification circuit, the 1st controllable silicon composition, one output of described zero sequence current mutual inductor secondary winding and another output are connected with another input with an input of the drive circuit of described solenoid respectively, it is characterized in that: be also provided with the 1st Resistor-Capacitor Unit, the 2nd Resistor-Capacitor Unit, photoelectrical coupler, circuits for triggering, between described ground wire and zero line, be connected with the detection loop being in series by an input and another input, described the 2nd Resistor-Capacitor Unit of described the 1st Resistor-Capacitor Unit, described photoelectrical coupler, the signal of described photoelectrical coupler output is sent into the input of described circuits for triggering, and the output of described circuits for triggering is connected with the control end of the drive circuit of described solenoid.
2. leakage protecting plug according to claim 1, is characterized in that: in described detection loop, be also provided with the 2nd rectification circuit; Described the 1st Resistor-Capacitor Unit one end is connected with described ground wire, and the 1st Resistor-Capacitor Unit other end is connected with the 2nd rectification circuit one input, and the 2nd another input of rectification circuit is connected with the 2nd Resistor-Capacitor Unit one end, and the 2nd Resistor-Capacitor Unit other end is connected with described zero line; The 2nd rectification circuit one output is connected with another input with an input of described photoelectrical coupler respectively with another output.
3. leakage protecting plug according to claim 1, is characterized in that: in described detection loop, be also provided with the 1st diode; Described the 1st diode one end is connected with described ground wire, the 1st diode other end is connected with the 1st Resistor-Capacitor Unit one end, the 1st Resistor-Capacitor Unit other end is connected with an input of photoelectrical coupler, another input of photoelectrical coupler is connected with the 2nd Resistor-Capacitor Unit one end, and the 2nd Resistor-Capacitor Unit other end is connected with described zero line.
4. leakage protecting plug according to claim 1; it is characterized in that: in described detection loop, be also provided with the 2nd diode; described the 1st Resistor-Capacitor Unit other end is connected with tie point and described the 2nd diode one end of an input of described photoelectrical coupler, and described the 2nd Resistor-Capacitor Unit one end is connected with tie point and described the 2nd diode other end of another input of described photoelectrical coupler.
5. leakage protecting plug according to claim 1, is characterized in that: the described the 1st or the 2nd Resistor-Capacitor Unit is the assembly of resistance or electric capacity or resistance and electric capacity.
6. leakage protecting plug according to claim 1; it is characterized in that: in the drive circuit of described solenoid, be also 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 triggering signal of output output and sends into the 1st controllable silicon trigger electrode.
7. leakage protecting plug according to claim 1, 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.
8. leakage protecting plug according to claim 1, it is characterized in that: in the drive circuit of described solenoid, be also provided with the 1st resistance, the 2nd resistance, the 3rd diode, the 1st voltage stabilizing didoe, described the 1st resistance one end is connected with described the 1st rectification circuit output end is anodal, the 1st resistance other end is connected with the 2nd resistance one end, the 2nd resistance other end is connected with the 3rd diode cathode, the 3rd diode cathode is connected with described the 1st rectification circuit output end negative pole, the 1st resistance other end is connected with tie point and the 1st voltage stabilizing didoe negative pole of the 2nd resistance one end, the 1st voltage stabilizing didoe is anodal to be connected with the 1st 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 3rd diode cathode.
9. leakage protecting plug according to claim 6, is characterized in that: described circuits for triggering are made up of the 1st triode, the 3rd resistance; One output of described photoelectrical coupler is connected with the power end of described amplifying circuit, the collector electrode of described the 1st triode respectively, another output of described photoelectrical coupler is connected with base stage, the 3rd resistance one end of described the 1st triode respectively, the 3rd resistance other end respectively with described amplifying circuit hold, the 1st rectification circuit output end negative pole is connected, the emitter of the 1st triode is connected with described the 1st silicon controlled trigger electrode.
10. according to the leakage protecting plug described in claim 1 or 7, it is characterized in that: in the drive circuit of described solenoid, be also provided with the 2nd controllable silicon, its circuits for triggering are made up of the 1st triode, the 3rd resistance, the 4th resistance, the 2nd voltage stabilizing didoe, described the 4th resistance one end is connected with the 1st rectification circuit output end is anodal, the 4th resistance other end is connected with the 2nd voltage stabilizing didoe negative pole, the 2nd voltage stabilizing didoe is anodal to be connected with described the 1st rectification circuit output end negative pole, one output of described photoelectrical coupler respectively with described the 2nd voltage stabilizing didoe negative pole, the collector electrode of the 1st triode connects, another output of described photoelectrical coupler respectively with the base stage of described the 1st triode, the 3rd resistance one end connects, the 3rd resistance other end respectively with the 2nd voltage stabilizing didoe positive pole, the 1st rectification circuit output end negative pole connects, the emitter of described the 1st triode is connected with the 2nd controllable silicon trigger electrode, the 2nd silicon controlled anode and negative electrode the respectively with 1st silicon controlled anode and negative electrode are connected in parallel.
11. leakage protecting plugs according to claim 8, is characterized in that: in the drive circuit of described solenoid, be also provided with the 2nd controllable silicon, its circuits for triggering are made up of the 1st triode, the 3rd resistance; One output of described photoelectrical coupler is connected with described the 1st voltage stabilizing didoe negative pole, another output of described photoelectrical coupler is connected with base stage, the 3rd resistance one end of described the 1st triode respectively, the 3rd resistance other end is connected with the 1st voltage stabilizing didoe is anodal, the collector electrode of the 1st triode is connected with the 1st voltage stabilizing didoe negative pole, the emitter of described the 1st triode is connected with the 2nd controllable silicon trigger electrode, and the 2nd silicon controlled anode and negative electrode the respectively with 1st silicon controlled anode and negative electrode are connected in parallel.
12. leakage protecting plugs according to claim 6, is characterized in that: described circuits for triggering are made up of the 3rd resistance, the 5th resistance, the 6th resistance, voltage comparator circuit, one-way conduction element, one output of described photoelectrical coupler is connected with the power end of described amplifying circuit, another output of photoelectrical coupler respectively with the 3rd resistance one end, one input of voltage comparator circuit connects, the 3rd resistance other end is connected with the ground end of amplifying circuit, described the 5th resistance one end is connected with the power end of described amplifying circuit, the 5th resistance other end is connected with the 6th resistance one end, the 6th resistance other end is connected with the ground end of described amplifying circuit, the 5th resistance other end is connected with the tie point of the 6th resistance one end and another input of voltage comparator circuit, voltage comparator circuit output is connected with described the 1st silicon controlled trigger electrode by one-way conduction element.
13. according to the leakage protecting plug described in claim 1 or 7, it is characterized in that: in the drive circuit of described solenoid, be also provided with the 2nd controllable silicon, its circuits for triggering are made up of the 3rd resistance, the 5th resistance, the 6th resistance, voltage comparator circuit, the 4th resistance, the 2nd voltage stabilizing didoe, described the 4th resistance one end is connected with the 1st rectification circuit output end is anodal, the 4th resistance other end is connected with the 2nd voltage stabilizing didoe negative pole, the 2nd voltage stabilizing didoe is anodal to be connected with described the 1st rectification circuit output end negative pole, one output of described photoelectrical coupler is connected with described the 2nd voltage stabilizing didoe negative pole, another output of photoelectrical coupler respectively with the 3rd resistance one end, one input of voltage comparator circuit connects, the 3rd resistance other end is connected with the 2nd voltage stabilizing didoe is anodal, described the 5th resistance one end is connected with described the 2nd voltage stabilizing didoe negative pole, the 5th resistance other end is connected with the 6th resistance one end, the 6th resistance other end is connected with described the 2nd voltage stabilizing didoe is anodal, the 5th resistance other end is connected with the tie point of the 6th resistance one end and another input of voltage comparator circuit, voltage comparator circuit output is connected with the 2nd silicon controlled trigger electrode.
14. leakage protecting plugs according to claim 8, is characterized in that: in the drive circuit of described solenoid, be also provided with the 2nd controllable silicon, its circuits for triggering are made up of the 3rd resistance, the 5th resistance, the 6th resistance, voltage comparator circuit, one output of described photoelectrical coupler is connected with described the 1st voltage stabilizing didoe negative pole, another output of photoelectrical coupler respectively with the 3rd resistance one end, one input of voltage comparator circuit connects, the 3rd resistance other end is connected with the 1st voltage stabilizing didoe is anodal, described the 5th resistance one end is connected with described the 1st voltage stabilizing didoe negative pole, the 5th resistance other end is connected with the 6th resistance one end, the 6th resistance other end is connected with described the 1st voltage stabilizing didoe is anodal, the 5th resistance other end is connected with the tie point of the 6th resistance one end and another input of voltage comparator circuit, voltage comparator circuit output is connected with the 2nd silicon controlled trigger electrode.
15. according to the leakage protecting plug described in claim 12 or 14, it is characterized in that: described voltage comparator circuit is selected voltage comparator exclusive disjunction amplifier.
16. leakage protecting plugs according to claim 12, is characterized in that: described one-way conduction element is the 4th diode.
17. leakage protecting plugs according to claim 12, is characterized in that: described one-way conduction element is the 2nd triode.
18. leakage protecting plugs according to claim 1; it is characterized in that: be at least provided with 1 light-emitting diode in the inside of described photoelectrical coupler, at least 1 described light-emitting diode is connected in series between an input and another input of described photoelectrical coupler.
19. leakage protecting plugs according to claim 1; it is characterized in that: be provided with 2 to 4 light-emitting diodes in the inside of described photoelectrical coupler, described 2 to 4 light-emitting diodes are connected between an input and another input of described photoelectrical coupler with parallel connection or series system.
20. leakage protecting plugs according to claim 13, is characterized in that: described voltage comparator circuit is selected voltage comparator exclusive disjunction amplifier.
CN201210057399.8A 2012-03-07 2012-03-07 Leakage protection plug Active CN102544930B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210057399.8A CN102544930B (en) 2012-03-07 2012-03-07 Leakage protection plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210057399.8A CN102544930B (en) 2012-03-07 2012-03-07 Leakage protection plug

Publications (2)

Publication Number Publication Date
CN102544930A CN102544930A (en) 2012-07-04
CN102544930B true CN102544930B (en) 2014-06-11

Family

ID=46351190

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210057399.8A Active CN102544930B (en) 2012-03-07 2012-03-07 Leakage protection plug

Country Status (1)

Country Link
CN (1) CN102544930B (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105048216A (en) * 2015-07-07 2015-11-11 深圳市良辉科技有限公司 Earth leakage protection plug being capable of detecting fault current and fault voltage of ground lines
CN105048207A (en) * 2015-07-07 2015-11-11 深圳市良辉科技有限公司 Earth leakage protection plug
CN104993330A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug
CN104993335A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug
CN105006705A (en) * 2015-07-22 2015-10-28 深圳市良辉科技有限公司 Protected mode-convertible type leakage protection plug
CN104993329A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug with switchable protection modes
CN105006707A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Protection-mode-convertible electric leakage protection plug
CN105071145A (en) * 2015-07-28 2015-11-18 深圳市良辉科技有限公司 Earth leakage protective plug with switchable ground wire protective modes
CN105006708A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Protection-mode-convertible electric leakage protection plug
CN105006709A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Ground-wire-protection-mode-convertible electric leakage protection plug
CN105024237A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Electric leakage protective plug
CN105024238A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Leakage protection plug capable of converting ground protection mode
CN105024240A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Earth leakage protection plug capable of converting ground wire protection modes
CN105024239A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Electric leakage protection plug
CN105006711A (en) * 2015-08-07 2015-10-28 深圳市良辉科技有限公司 Leakage protection plug capable of converting ground wire protection mode
CN105186226A (en) * 2015-09-15 2015-12-23 深圳市良辉科技有限公司 Earth leakage protection plug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201975637U (en) * 2010-09-10 2011-09-14 吴敏 Household power failure alarming and electric appliance protecting power supply socket
CN102290689A (en) * 2011-06-23 2011-12-21 刘睿刚 Earth leakage protection plug
CN102324718A (en) * 2011-10-05 2012-01-18 刘睿刚 Power leakage protector
CN102354863A (en) * 2011-06-23 2012-02-15 刘睿刚 Electricity leakage protection plug
CN202564707U (en) * 2012-03-07 2012-11-28 佛山市新基德电子厂有限公司 Electric leakage protection plug

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201975637U (en) * 2010-09-10 2011-09-14 吴敏 Household power failure alarming and electric appliance protecting power supply socket
CN102290689A (en) * 2011-06-23 2011-12-21 刘睿刚 Earth leakage protection plug
CN102354863A (en) * 2011-06-23 2012-02-15 刘睿刚 Electricity leakage protection plug
CN102324718A (en) * 2011-10-05 2012-01-18 刘睿刚 Power leakage protector
CN202564707U (en) * 2012-03-07 2012-11-28 佛山市新基德电子厂有限公司 Electric leakage protection plug

Also Published As

Publication number Publication date
CN102544930A (en) 2012-07-04

Similar Documents

Publication Publication Date Title
CN102544930B (en) Leakage protection plug
CN204144599U (en) A kind of leakage protecting plug
CN101459302A (en) All-purpose leakage protection plug for ground wire live trip
CN102354866B (en) Electricity leakage protection plug
CN202616744U (en) Leakage protector
CN102324717B (en) Leakage protection device
CN205753342U (en) Earth leakage protective device
CN202183530U (en) Electric leakage protection plug with alarming device
CN202817702U (en) Current leakage protection device
CN102354869B (en) Electricity leakage protection plug with alarm device
CN102364762B (en) Leakage protection plug
CN202564707U (en) Electric leakage protection plug
CN201750009U (en) Household appliance leakage protection socket
CN102386609B (en) Leakage protection device
CN205029117U (en) Current leakage protection plug
CN102290689B (en) Earth leakage protection plug
CN102354949B (en) Leakage protecting device
CN205141288U (en) Convertible ground wire protected mode's leakage protection plug
CN105006708A (en) Protection-mode-convertible electric leakage protection plug
CN102354863A (en) Electricity leakage protection plug
CN205141287U (en) Can change ground wire protected mode's leakage protection plug
CN205122902U (en) Can change ground wire protected mode's leakage protection plug
CN202260388U (en) Earth leakage protection device
CN204858174U (en) Can detect leakage protection plug of ground wire fault current and trouble voltage
CN201365037Y (en) All-around leakage protection plug tripped by electrified earth line

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model