CN105024239A - Electric leakage protection plug - Google Patents

Electric leakage protection plug Download PDF

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Publication number
CN105024239A
CN105024239A CN201510479912.6A CN201510479912A CN105024239A CN 105024239 A CN105024239 A CN 105024239A CN 201510479912 A CN201510479912 A CN 201510479912A CN 105024239 A CN105024239 A CN 105024239A
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CN
China
Prior art keywords
1st
2nd
ground wire
connected
described
Prior art date
Application number
CN201510479912.6A
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Chinese (zh)
Inventor
谭文兴
史泽华
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深圳市良辉科技有限公司
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Priority to CN201510479912.6A priority Critical patent/CN105024239A/en
Publication of CN105024239A publication Critical patent/CN105024239A/en

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Abstract

The invention relates to an electric leakage protection plug, comprising a shell, a plug pin, a phase line, a zero line, a ground wire, a zero sequence current mutual inductor, a test loop, an electromagnetic tripping locking device, a ground wire fault current detection circuit, a ground wire fault voltage detection circuit, a first change-over switch, a second change-over switch, and a unidirectional conducting circuit. A secondary winding output end of the zero sequence current mutual inductor is connected with a first input end and a second input end of an amplifying circuit. An output end of the unidirectional conducting circuit is directly connected with a control electrode of controllable silicone. A secondary winding output end of a ground wire electrification detection inductor connected with the second change-over switch is connected with a second input end and a third input end of the amplifying circuit. A trigger output end of the amplifying circuit is connected with the control electrode of the controllable silicone through a second diode. The electric leakage protection plug can switch selection between a ground wire fault current protection mode and a ground wire fault electricity protection voltage mode, solves the problem of wrong tripping of the electric leakage protection plug, and ensures that electricity utilization by people is safer.

Description

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

Existing leakage protecting plug is by ground wire fault current detection being divided into protect to the detection protected mode of ground wire electrification and ground wire false voltage detection protection two series products.

Chinese patent literature CN1142618C discloses a kind of leakage protecting plug that can detect ground wire fault current; on this leakage protecting plug when protection system to earth exception causes ground wire accident charged; ground wire can be detected and have non-faulty current; when ground wire fault current reaches preset threshold values, it action immediately can cut off phase line, zero line and ground wire.It can thus be appreciated that; as long as this kind of leakage protecting plug ground wire fault current reaches predetermined threshold values; leakage protecting plug will trip and with ground wire with false voltage height irrelevant; therefore; this kind of leakage protecting plug occurs causing leakage protecting plug mistrip when being greater than predetermined threshold values fault current when ground wire false voltage is lower but because of ground wire, causes people normally to use.

Chinese patent literature CN202142735U also discloses a kind of leakage protecting plug that can detect ground wire false voltage, and this kind of leakage protecting plug will automatic trip and haveing nothing to do with the size of ground wire fault current when the abnormal and ground wire false voltage of grounding system reaches predetermined threshold values.Therefore, this leakage protecting plug the false voltage that ground wire exists be greater than reservation threshold induced voltage but flow through the fault current of ground wire very faint time also can cause this kind of leakage protecting plug mistrip, cause people normally to use.

For this reason, in the urgent need to a kind of ground wire electrification solution that can adapt to various power utilization environment on electric heater market, thus minimizing after-sales service probability can be reached.

Summary of the invention

The object of the present invention is to provide a kind of leakage protecting plug; this leakage protecting plug can not only detect ground wire fault current and ground wire false voltage; selectivity conversion can also be carried out to the electrization protection function of ground wire detection failure electric current and detection failure voltage; thus the problem both solved because mistrip causes leakage protecting plug to use, after-sales service rate and maintenance cost can be reduced again.

Technical solution proposed by the invention is such:

A kind of leakage protecting plug, include shell, latch, 1st phase line and the 2nd phase line, 1st zero line and the 2nd zero line, 1st ground wire and the 2nd ground wire, the zero sequence current mutual inductor that described 2nd phase line and the 2nd zero line all pass, the ground wire electrified detection inductor that described 2nd ground wire passes, test loop, electromagnetic trip and locker, this electromagnetic trip and locker are by solenoid and drive circuit thereof, phase line switch contacts, zero line switch contacts, ground wire switch contacts forms, the drive circuit of described solenoid is primarily of the 1st rectification circuit, controllable silicon, 1st resistance, amplifying circuit forms, also be provided with ground wire false voltage testing circuit, 1st change over switch, 2nd change over switch, one-way conduction circuit, described ground wire false voltage testing circuit is provided with the 1st electric capacity, the 2nd rectification circuit, the 3rd Resistor-Capacitor Unit, photoelectrical coupler, the 4th resistance, the 1st triode, the 5th resistance, 1st resistance one end is connected with the 1st rectification circuit DC output end positive pole, controllable silicon anode, the 1st resistance other end is connected with the power end of amplifying circuit, the 3rd foot of the 1st change over switch, ground end, the controllable silicon negative electrode of amplifying circuit are connected with the 1st rectification circuit DC output end negative pole, the trigger output end of amplifying circuit is connected with the 2nd diode cathode, and the 2nd diode cathode is connected with SCR control pole, one output, an output of described ground wire electrified detection inductor secondary winding of described zero sequence current mutual inductor secondary winding are connected with the 2nd input of described amplifying circuit, and another output of described zero sequence current mutual inductor secondary winding is connected with the 1st input of described amplifying circuit, described another output of ground wire electrified detection inductor secondary winding is connected with the 3rd foot of the 2nd change over switch, and the 1st foot of the 2nd change over switch is connected with the 3rd input of amplifying circuit, by described 1st electric capacity, the ac input end of the 2nd rectification circuit, the loop that 3rd Resistor-Capacitor Unit is in series successively is connected between the 1st described ground wire and the 1st zero line, the DC output end of the 2nd rectification circuit and the input of photoelectrical coupler are connected in parallel, photoelectrical coupler one output, 1st transistor collector is connected with the 2nd foot of the 1st change over switch, another output of photoelectrical coupler and the 4th resistance one end, 1st transistor base connects, 1st transistor emitter is connected with the 5th resistance one end, the 5th resistance other end, the 4th resistance other end is connected with the 1st rectification circuit DC output end negative pole, the input of one-way conduction circuit and the 1st transistor emitter, 5th resistance one end connects, the output of one-way conduction circuit and the 2nd diode cathode, SCR control pole connects, described 1st change over switch and described 2nd change over switch link and open or close.

The 2nd resistance and light-emitting diode can also be provided with in the 1st transistor collector loop; 2nd resistance one end is connected with the 2nd foot of the 1st change over switch, and the 2nd resistance other end is connected with light-emitting diode positive pole, and light-emitting diode negative pole is connected with the 1st rectification circuit DC output end negative pole.

On described 1st change over switch and the integrated drain pan being arranged on described shell of the 2nd change over switch.

Described light-emitting diode is arranged on the face-piece of described shell.

Described one-way conduction circuit is made up of the 1st diode.

Described one-way conduction circuit is made up of the 2nd triode.

Described 3rd Resistor-Capacitor Unit is made up of resistance.

Described 3rd Resistor-Capacitor Unit is made up of electric capacity.

Described 3rd Resistor-Capacitor Unit is made up of the assembly of resistance and electric capacity.

Compared with prior art, the present invention has following remarkable result:

(1) leakage protecting plug of the present invention can detect the fault current that ground wire occurs; once the fault current that ground wire surprisingly occurs reaches predetermined threshold values; it just can immediately phase, zero, the switch contacts of ground wire all disconnects, so the present invention provides a kind of safer Electrical Safety guarantee than existing leakage protecting plug.

(2) leakage protecting plug of the present invention also can detect the false voltage that ground wire occurs; the false voltage surprisingly occurred once ground wire reaches predetermined threshold values directly to be triggered controlled silicon conducting and drives solenoid work; improve reaction speed, shorten break-time; before people get an electric shock; it just can immediately phase, zero, the switch contacts of ground wire all disconnects, so the present invention provides a kind of safer Electrical Safety guarantee than existing leakage protecting plug.

(3) leakage protecting plug of the present invention is by the electrization protection function of change over switch selection to ground wire; so just can select suitable earth wire charged protecting function for concrete power utilization environment; both solved the problem of existing leakage protecting plug mistrip, and be convenient to again product after-sales service and reduce product after-sales service cost.

(4) amplifying circuit of leakage protecting plug of the present invention is inner because being provided with 2 input amplifiers, and these 2 input amplifiers share the 2nd input, the signal that such zero sequence current mutual inductor secondary winding exports and the signal that ground wire electrified detection inductor secondary winding exports send into the 1st input of an input amplifier and the 3rd input of another input amplifier respectively, reach and only just the ground wire electrification signal detected by the electric leakage signal detected by zero sequence current mutual inductor and ground wire electrification inductor is separated independent process with an amplifying circuit, and reduce cost.

Leakage protecting plug of the present invention is mainly used in the earth leakage protective of various household electrical appliance, mainly makes the power line of band leakage protecting plug.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of a kind of leakage protecting plug of one embodiment of the invention.

Fig. 2 is the another kind of replacement circuit schematic diagram of the one-way conduction circuit 30 shown in Fig. 1.

Embodiment

By embodiment below, the present invention is further elaborated.

Shown in Figure 1; a kind of leakage protecting plug, include the zero sequence current mutual inductor 17 that shell, latch, the 1st phase line 1 and the 2nd phase line 4, the 1st zero line 2 and the 2nd zero line 5, the 1st ground wire 3 and the 2nd ground wire 6, described 2nd phase line 4 and the 2nd zero line 5 all pass, ground wire electrified detection inductor 18 that described 2nd ground wire 6 passes, test loop 12, electromagnetic trip and locker.This electromagnetic trip and locker are made up of solenoid 13 and drive circuit thereof, phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9.The drive circuit of described solenoid 13 forms primarily of the 1st rectification circuit 14, controllable silicon 15, the 1st resistance 10, amplifying circuit 16.Also be provided with ground wire false voltage testing circuit, the 1st change over switch 26-1, the 2nd change over switch 26-2, one-way conduction circuit 30.Described ground wire false voltage testing circuit is provided with the 1st electric capacity 19, the 2nd rectification circuit 20, the 3rd Resistor-Capacitor Unit 21, photoelectrical coupler 22, the 4th resistance 23, the 1st triode 24, the 5th resistance 25.1st resistance 10 one end is connected with the 1st rectification circuit 14 DC output end positive pole, controllable silicon 15 anode, 1st resistance 10 other end is connected with the power end Vs1 of amplifying circuit 16, the 3rd foot 26-1-3 of the 1st change over switch 26-1, ground end GND1, controllable silicon 15 negative electrode of amplifying circuit 16 are connected with the 1st rectification circuit 14 DC output end negative pole, the trigger output end 16-4 of amplifying circuit 16 is connected with the 2nd diode 11 positive pole, and the 2nd diode 11 negative pole controls pole with controllable silicon 15 and is connected.One output, an output of described ground wire electrified detection inductor 18 secondary winding of described zero sequence current mutual inductor 17 secondary winding are connected with the 2nd input 16-2 of described amplifying circuit 16.Another output of described zero sequence current mutual inductor 17 secondary winding is connected with the 1st input 16-1 of described amplifying circuit 16, described another output of ground wire electrified detection inductor 18 secondary winding is connected with the 3rd foot 26-2-3 of the 2nd change over switch 26-2, and the 1st foot 26-2-1 of the 2nd change over switch 26-2 is connected with the 3rd input 16-3 of amplifying circuit 16.By described 1st electric capacity 19, the ac input end of the 2nd rectification circuit 20, the loop that 3rd Resistor-Capacitor Unit 21 is in series successively is connected between the 1st described ground wire 3 and the 1st zero line 2, the DC output end of the 2nd rectification circuit 20 and the input of photoelectrical coupler 22 are connected in parallel, photoelectrical coupler 22 1 output, 1st triode 24 collector electrode is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1, another output of photoelectrical coupler 22 and the 4th resistance 23 one end, the base stage of the 1st triode 24 connects, 1st triode 24 emitter is connected with the 5th resistance 25 one end, 5th resistance 25 other end, 4th resistance 23 other end is connected with the 1st rectification circuit 14 DC output end negative pole, the input Vi1 of one-way conduction circuit 30 and the 1st triode 24 emitter, 5th resistance 25 one end connects, the output end vo 1 of one-way conduction circuit 30 and the 2nd diode 11 negative pole, controllable silicon 15 controls pole and connects, described 1st change over switch 26-1 and described 2nd change over switch 26-2 links and opens or closes.

The present invention can also be equipped with the 2nd resistance 29 and light-emitting diode 28, as shown in Figure 1,2nd resistance 29 one end is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1 and the collector electrode of the 1st triode 24,2nd resistance 29 other end is connected with light-emitting diode 28 positive pole, light-emitting diode 28 negative pole is connected with the 1st rectification circuit 14 DC output end negative pole, and described light-emitting diode 28 is arranged on the face-piece of described shell.

In the present embodiment, on described 1st change over switch 26-1 and the integrated drain pan being arranged on described shell of the 2nd change over switch 26-2

In the present embodiment, one-way conduction circuit 30 is made up of the 1st diode 30-1.As shown in Figure 2, one-way conduction circuit 30 can also select the 2nd triode 30-2 to form, now, the base stage of the 2nd triode 30-2 is connected with the input Vi1 of one-way conduction circuit 30, the emitter of the 2nd triode 30-2 is connected with the output end vo 1 of one-way conduction circuit 30, and the collector electrode of the 2nd triode 30-2 is connected with the 2nd foot 26-1-2 of the 1st change over switch 26-1.

In the present embodiment, described 3rd Resistor-Capacitor Unit 21 is made up of resistance, can also select and form by electric capacity or by the assembly of resistance and electric capacity.

In the present embodiment, amplifying circuit 16 inside is provided with 2 input amplifiers, one of them input amplifier is used for processing the signal that zero sequence current mutual inductor 17 secondary winding exports, another input amplifier is used for processing the signal that ground wire electrified detection inductor 18 secondary winding exports, and the 2nd input 16-2 of both shared amplifying circuits 16.

During use, leakage protecting plug reset key is pressed, the consuming device that the closed connection mains supply of phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 is lower end provides working power.

In use, leak electricity if damaged generation occurs in the insulation of consuming device, zero sequence current mutual inductor 17 detects this electric leakage signal and the 1st input 16-1 of this signal input amplifying circuit 16 and the 2nd input 16-2, when leakage current reaches predetermined threshold values, the trigger output end 16-4 output signal of amplifying circuit 16 triggers controllable silicon 15 conducting makes solenoid 13 work, phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 are all disconnected immediately, thus has ensured the Electrical Safety of people.

If when leakage protecting plug of the present invention is selected the 2nd change over switch 26-2 and the 1st change over switch 26-1 to be connected to ground wire fault-current protection pattern according to environment for use in advance, as shown in Figure 1, connect between the 1st foot 26-2-1 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2, the 2nd foot 26-2-2's of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2 is separated, meanwhile, due to linkage action between the 1st change over switch 26-1 and the 2nd change over switch 26-2, also connect between the 1st foot 26-1-1 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1, also disconnect between the 2nd foot 26-1-2 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1, light-emitting diode 28 is in OFF state, instruction leakage protecting plug is in ground wire fault-current protection pattern.When grounding system generation exception causes the 1st ground wire 3 and the 2nd ground wire 6 accident is charged, ground wire electrified detection inductor 18 on ground wire fault current detection circuit detects the fault current flowing through the 2nd ground wire 6 immediately and signal is sent into the 2nd input 16-2 and the 3rd input 16-3 of amplifying circuit 16, when the ground wire fault current detected is greater than predetermined current threshold, the trigger output end 16-4 output signal of amplifying circuit 16 triggers controllable silicon 15 conducting makes solenoid 13 work phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 all disconnects immediately, thus ensured the Electrical Safety of people better.

If when leakage protecting plug of the present invention is selected the 1st change over switch 26-1 and the 2nd change over switch 26-2 to be connected to ground wire false voltage protected mode according to environment for use in advance; the 1st foot 26-1-1's of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1 is separated; connect between the 2nd foot 26-1-2 of the 1st change over switch 26-1 and the 3rd foot 26-1-3 of the 1st change over switch 26-1; light-emitting diode 28 luminescence is lighted, and instruction leakage protecting plug is in ground wire false voltage protected mode.Meanwhile, due to linkage action between the 1st change over switch 26-1 and the 2nd change over switch 26-2, so, also disconnect between the 1st foot 26-2-1 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2, also connect between the 2nd foot 26-2-2 of the 2nd change over switch 26-2 and the 3rd foot 26-2-3 of the 2nd change over switch 26-2.When grounding system generation exception causes the 1st ground wire 3 and the 2nd ground wire 6 accident is charged, photoelectrical coupler 22 on ground wire false voltage testing circuit outputs signal to the 1st triode 24, when the ground wire false voltage detected is greater than predetermined threshold voltage, 1st triode 24 exports high level signal to the 1st diode 30-1 positive pole of one-way conduction circuit 30, make its conducting and trigger controllable silicon 15 conducting, solenoid 13 is made to work phase line switch contacts 7, zero line switch contacts 8, ground wire switch contacts 9 all disconnects immediately, thus ensured the Electrical Safety of people better.

Claims (9)

1. a leakage protecting plug, include shell, latch, 1st phase line and the 2nd phase line, 1st zero line and the 2nd zero line, 1st ground wire and the 2nd ground wire, the zero sequence current mutual inductor that described 2nd phase line and the 2nd zero line all pass, the ground wire electrified detection inductor that described 2nd ground wire passes, test loop, electromagnetic trip and locker, this electromagnetic trip and locker are by solenoid and drive circuit thereof, phase line switch contacts, zero line switch contacts, ground wire switch contacts forms, the drive circuit of described solenoid is primarily of the 1st rectification circuit, controllable silicon, 1st resistance, amplifying circuit forms, it is characterized in that: be also provided with ground wire false voltage testing circuit, 1st change over switch, 2nd change over switch, one-way conduction circuit, described ground wire false voltage testing circuit is provided with the 1st electric capacity, the 2nd rectification circuit, the 3rd Resistor-Capacitor Unit, photoelectrical coupler, the 4th resistance, the 1st triode, the 5th resistance, 1st resistance one end is connected with the 1st rectification circuit DC output end positive pole, controllable silicon anode, the 1st resistance other end is connected with the power end of amplifying circuit, the 3rd foot of the 1st change over switch, ground end, the controllable silicon negative electrode of amplifying circuit are connected with the 1st rectification circuit DC output end negative pole, the trigger output end of amplifying circuit is connected with the 2nd diode cathode, and the 2nd diode cathode is connected with SCR control pole, one output, an output of described ground wire electrified detection inductor secondary winding of described zero sequence current mutual inductor secondary winding are connected with the 2nd input of described amplifying circuit, and another output of described zero sequence current mutual inductor secondary winding is connected with the 1st input of described amplifying circuit, described another output of ground wire electrified detection inductor secondary winding is connected with the 3rd foot of the 2nd change over switch, and the 1st foot of the 2nd change over switch is connected with the 3rd input of amplifying circuit, by described 1st electric capacity, the ac input end of the 2nd rectification circuit, the loop that 3rd Resistor-Capacitor Unit is in series successively is connected between the 1st described ground wire and the 1st zero line, the DC output end of the 2nd rectification circuit and the input of photoelectrical coupler are connected in parallel, photoelectrical coupler one output, 1st transistor collector is connected with the 2nd foot of the 1st change over switch, another output of photoelectrical coupler and the 4th resistance one end, 1st transistor base connects, 1st transistor emitter is connected with the 5th resistance one end, the 5th resistance other end, the 4th resistance other end is connected with the 1st rectification circuit DC output end negative pole, the input of one-way conduction circuit and the 1st transistor emitter, 5th resistance one end connects, the output of one-way conduction circuit and the 2nd diode cathode, SCR control pole connects, described 1st change over switch and described 2nd change over switch link and open or close.
2. leakage protecting plug according to claim 1, is characterized in that: be also provided with the 2nd resistance and light-emitting diode; 2nd resistance one end is connected with the 2nd foot of the 1st change over switch, and the 2nd resistance other end is connected with light-emitting diode positive pole, and light-emitting diode negative pole is connected with the 1st rectification circuit DC output end negative pole.
3. leakage protecting plug according to claim 1, is characterized in that: on described 1st change over switch and the integrated drain pan being arranged on described shell of the 2nd change over switch.
4. leakage protecting plug according to claim 2, is characterized in that: described light-emitting diode is arranged on the face-piece of described shell.
5. leakage protecting plug according to claim 1, is characterized in that: described one-way conduction circuit is made up of the 1st diode.
6. leakage protecting plug according to claim 1, is characterized in that: described one-way conduction circuit is made up of the 2nd triode.
7. leakage protecting plug according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of resistance.
8. leakage protecting plug according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of electric capacity.
9. leakage protecting plug according to claim 1, is characterized in that: described 3rd Resistor-Capacitor Unit is made up of the assembly of resistance and electric capacity.
CN201510479912.6A 2015-08-07 2015-08-07 Electric leakage protection plug CN105024239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510479912.6A CN105024239A (en) 2015-08-07 2015-08-07 Electric leakage protection plug

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Application Number Priority Date Filing Date Title
CN201510479912.6A CN105024239A (en) 2015-08-07 2015-08-07 Electric leakage protection plug

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CN105024239A true CN105024239A (en) 2015-11-04

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202094431U (en) * 2011-06-23 2011-12-28 刘睿刚 Leakage protection plug
CN202167713U (en) * 2011-08-09 2012-03-14 刘睿刚 Leakage protective plug
CN202183530U (en) * 2011-08-19 2012-04-04 刘睿刚 Electric leakage protection plug with alarming device
CN102544930A (en) * 2012-03-07 2012-07-04 佛山市新基德电子厂有限公司 Leakage protection plug
CN103187704A (en) * 2013-03-28 2013-07-03 余姚市嘉荣电子电器有限公司 Leakage protection device for preventing electrification of ground wire
CN204144599U (en) * 2014-09-16 2015-02-04 深圳市良辉科技有限公司 A kind of leakage protecting plug
CN104577977A (en) * 2014-12-26 2015-04-29 余姚市嘉荣电子电器有限公司 Voltage and current switchable type electric leakage protection device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202094431U (en) * 2011-06-23 2011-12-28 刘睿刚 Leakage protection plug
CN202167713U (en) * 2011-08-09 2012-03-14 刘睿刚 Leakage protective plug
CN202183530U (en) * 2011-08-19 2012-04-04 刘睿刚 Electric leakage protection plug with alarming device
CN102544930A (en) * 2012-03-07 2012-07-04 佛山市新基德电子厂有限公司 Leakage protection plug
CN103187704A (en) * 2013-03-28 2013-07-03 余姚市嘉荣电子电器有限公司 Leakage protection device for preventing electrification of ground wire
CN204144599U (en) * 2014-09-16 2015-02-04 深圳市良辉科技有限公司 A kind of leakage protecting plug
CN104577977A (en) * 2014-12-26 2015-04-29 余姚市嘉荣电子电器有限公司 Voltage and current switchable type electric leakage protection device

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