CN102290689B

CN102290689B - Earth leakage protection plug

Info

Publication number: CN102290689B
Application number: CN 201110171340
Authority: CN
Inventors: 刘睿刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-23
Filing date: 2011-06-23
Publication date: 2013-02-20
Anticipated expiration: 2031-06-23
Also published as: CN102290689A

Abstract

The invention discloses an earth leakage protection plug, which not only can prevent electric shock accidents caused by electric appliance faults, but also can prevent electric shock accidents caused by the accidentally electrified earth line. The earth leakage protection plug comprises a shell, bolts, a phase line, a zero line, an earth line, a rectifying circuit, a first silicon controlled rectifier, a second silicon controlled rectifier, an amplifying circuit, a zero-sequence current mutual inductor, a test loop, an electrified earth line detection inductor and an electromagnetic tripping and latching device, a loop which comprises a first resistor, a second resistor and a diode is connected between the anode and the cathode of the output end of the rectifying circuit, the first resistor, the second resistor and the diode are sequentially connected in series, the secondary output end of the electrified earth line detection inductor is connected between the joint between the second resistor and the anode of the diode and the trigger electrode of the second silicon controlled rectifier, the joint between the first and the second resistors and the cathode of the output end of the rectifying circuit are also respectively connected with the power end and the earth end of the amplifying circuit, and the anode and the cathode of the second silicon controlled rectifier are connected with the anode and the cathode of the output end of the rectifying circuit.

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 leakage protecting plug, mainly be provided with rectification circuit (DC power supply); controllable silicon; electromagnetic trip and locker; amplifying circuit; zero sequence current mutual inductor; the ground wire electrified detection inductor; owing to being arranged on the load phase; zero sequence current mutual inductor on the zero line road shares an amplifying circuit with the ground wire electrified detection inductor that is arranged on the ground wire; therefore; existing leakage protecting plug is the such defective of unavoidable appearance just: when the amplifying circuit on the leakage protecting plug breaks down; then leakage protecting plug is in the load end phase; electromagnetic trip and locker all can not be threaded off when system zero-line failure electric leakage or ground wire electrification, lose normal defencive function.

Also has a kind of leakage protecting plug; this leakage protecting plug mainly is provided with the phase of belt switch; zero; ground three utmost points; be located at phase; zero sequence current mutual inductor between the zero line; the test loop; amplifying circuit; direct current; controllable silicon; release; be installed with ground wire instrument transformer (ground wire electrified detection inductor) in the ground wire; the output shunt capacitance of ground wire instrument transformer; resistance; the ground wire instrument transformer is exported an end and is connected with another controllable silicon trigger electrode; the ground wire instrument transformer output other end is connected with the rectification circuit negative pole; the controllable silicon both positive and negative polarity is connected with the both positive and negative polarity of rectified current; therefore; just there is following defective in this leakage protecting plug: because the ground wire instrument transformer must have very large output signal and could trigger controlled silicon conducting; therefore; in order to make the ground wire instrument transformer reach the requirement of high output; the ground wire instrument transformer must use a lot of precious metal materials; cause volume large; cost is high; and could trigger controlled silicon conducting in the time of can only using the occasion (30mA) that the requirement of ground wire operating current value is larger when charged to the ground wire accident and make the leakage protecting plug tripping operation; and when ground wire operating current value (for example: in the time of 3mA) requires less occasion when the ground wire accident is charged to using; can not trigger controlled silicon conducting because the signal of ground wire instrument transformer output is very faint; leakage protecting plug can not trip; thereby this leakage protecting plug can not use in the demanding occasion of security performance; therefore its sensitivity is low, still may cause electric shock accidents.

Summary of the invention

The object of the present invention is to provide a kind of with low cost, volume is small and exquisite, can overcome again the leakage protecting plug of above-mentioned existing leakage protecting plug defective; the ground wire that electric leakage or load end not only can occur on the phase of load end, zero line road for it meets accident and in time phase line contact, zero line contact and ground wire contact is all disconnected when charged; and it that this parameter value of ground wire operating current of leakage protecting plug is made is very little, thereby leakage protecting plug can be used in the demanding occasion of security performance.

Technical solution proposed by the invention is such:

A kind of leakage protecting plug, comprise plug body and phase, zero, ground three utmost point latches, phase line, zero line, ground wire, rectification circuit, the 1st controllable silicon, the 2nd controllable silicon, the zero sequence current mutual inductor that phase line and zero line pass, amplifying circuit, the test loop, the ground wire electrified detection inductor that ground wire passes, electromagnetic trip and locker, electromagnetic trip and locker comprise solenoid, the phase line contact, the zero line contact, the ground wire contact, between described rectification circuit output end positive pole and negative pole, be connected with by the 1st resistance, the 2nd resistance, the loop that diode is composed in series, described rectification circuit output end is anodal to be connected with the 1st resistance one end, the 1st resistance other end is connected with the 2nd resistance one end, the 2nd resistance other end is connected with diode cathode, and diode cathode is connected with described rectification circuit output end negative pole; Described the 2nd resistance other end also is connected with secondary output one end of described ground wire electrified detection inductor with the tie point of described diode cathode, and the secondary output other end of described ground wire electrified detection inductor is connected with described the 2nd controllable silicon trigger electrode; Described the 2nd controllable silicon anode is connected with negative electrode with described rectification circuit output end is anodal and is connected with negative pole; Described the 1st resistance other end also is connected with described amplifying circuit power end with the tie point of the 2nd resistance one end, and described amplifying circuit ground end is connected with described rectification circuit output end negative pole.

Substantive features of the present invention are can detect the load phase except the same with the leakage protecting plug of prior art; whether chargedly have or not residual current between the zero line and detect ground wire; work as phase; move immediately mutually with the ground wire Shi Douhui that breaks down respectively or simultaneously between the zero line; zero; outside ground all disconnects; also be a leakage protecting plug load end phase; the detection of zero line road fault electric leakage; amplify; the unexpected charged detection of drive circuit and ground wire; drive circuit was arranged in relative minute; and the ground wire electrified detection inductor is arranged on the circuit of a diode clamp, thereby has realized that the ground wire electrified detection inductor need not very high output signal and just can trigger controlled silicon conducting and make leakage protecting plug tripping operation.

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

(1), leakage protecting plug of the present invention is arranged the detection of load end phase, system zero-line failure electric leakage, amplification, drive circuit relative dividing with ground wire unexpected charged detection, drive circuit, so just prevented that creepage protection function and the earth wire charged protecting function on leakage protecting plug load end phase, zero line road lost efficacy when amplifying circuit breaks down simultaneously.

(2), leakage protecting plug of the present invention just can trigger the 2nd controllable silicon owing to the ground wire electrified detection inductor need not very high output signal; a large amount of precious metal materials have been saved; so leakage protecting plug of the present invention can be done to such an extent that volume is less, technique is simple, can save significantly cost.

(3), leakage protecting plug of the present invention provides protection in the time of not only can be for the electric leakage of the loaded line fault of its lower end, phase line contact, zero line contact, ground wire contact are all disconnected; Can also provide protection when charged for the ground wire of load end is unexpected, phase line contact, zero line contact, ground wire contact are all disconnected.

(4), the ground wire operating current threshold values of leakage protecting plug of the present invention can be accomplished very little; leakage protecting plug ground wire action sensitivity is improved greatly, thereby leakage protecting plug of the present invention can be used in the occasion that has the inaccessiable highly sensitive requirement of leakage protecting plug now.

(5), leakage protecting plug of the present invention has been owing to having utilized dropping resistor, the built-in voltage stabilizing circuit of amplifying circuit dexterously, therefore need not to set up in addition voltage stabilizing circuit and dropping resistor, can save more significantly cost.

Leakage protecting plug of the present invention is mainly used on the earth leakage protective of various household electrical appliance.

Description of drawings

Fig. 1 is the electrical principle schematic diagram of the leakage protecting plug of one embodiment of the invention.

Embodiment

By following embodiment the present invention is further elaborated.

Referring to shown in Figure 1, a kind of leakage protecting plug mainly by plug body and phase, zero, phase line 5, zero line 6, ground wire 7, rectification circuit 13, the 1st controllable silicon 15, zero sequence current mutual inductor 11, test loop T, ground wire electrified detection inductor 12, load end phase line 8, zero line 9, ground wire 10, amplifying circuit 14, the 1st resistance 17, the 2nd resistance 18, diode 19, the 2nd controllable silicon 16, electromagnetic trip and the locker of three utmost point latches, power end form.Electromagnetic trip and locker mainly are comprised of solenoid, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4.Described the 1st resistance 17 1 ends are connected with described rectification circuit 13 output head anodes, the 1st resistance 17 other ends are connected with the 2nd resistance 18 1 ends, the 2nd resistance 18 other ends and 19 anodal connections of diode, diode 19 negative poles are connected with described rectification circuit 13 negative pole of output end, the 1st resistance 17 also is connected with amplifying circuit 14 power ends+VS with the tie point of the 2nd resistance 18, amplifying circuit 14 ground end GND are connected with described rectification circuit 13 negative pole of output end, the tie point of described the 2nd resistance 18 other ends and described diode 19 positive poles also be connected 12 levels of ground wire electrified detection inductor and export an end and be connected, 12 levels of described ground wire electrified detection inductor output other end and the 2nd controllable silicon 16 trigger electrodes connect, and described the 2nd controllable silicon 16 anodes are connected with negative electrode with described rectification circuit 13 output head anodes and are connected with negative pole.

During use; the push rod that resets 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; the rectification circuit 13 that is connected between phase line 8 and the zero line 9 gets electric; diode 19 on the voltage clamp circuit is through the 1st resistance 17; the 2nd resistance 18 step-down current limlitings; amplifying circuit 14 power end voltage stabilizings and conducting; the forward voltage of its positive terminal is clamped at approximately about 0.3V after diode 19 conductings; because this clamp voltage also is not enough to trigger 16 conductings of the 2nd controllable silicon, so leakage protecting plug can be normally provided power supply for the load of its lower end.

During use; in case ground wire 10 is unexpected charged; ground wire electrified detection inductor 12 in the leakage protecting plug detects load end ground wire 10 unexpected charged electric currents; signal of 12 level output of ground wire electrified detection inductor; this signal will be superimposed upon diode 19 forward conduction voltage drops approximately on the 0.3V; and when the unexpected electric current of ground wire reaches predefined a certain numerical value; for example: 3mA; ground wire electrified detection inductor 12 just triggers 16 conductings of the 2nd controllable silicon; leakage protecting plug is threaded off; phase line contact 1-1 and 2-1; zero line contact 1-2 and 2-2;

ground wire contact

3 and 4 disconnects, thereby provides the Electrical Safety guarantee for the user.

During use; in case the electric leakage of the apparatus failure on load end phase line 8, the zero line 9; zero sequence current mutual inductor 11 detects the residual current between phase, the zero line and exports a signal to amplifying circuit 14; and when residual current reaches the threshold values that presets; the 1st controllable silicon 15 will be exaggerated circuit 14 triggering and conducting; leakage protecting plug is threaded off, and phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2,

ground wire contact

3 and 4 disconnections, thereby provides the Electrical Safety guarantee for the user.

Claims

1. leakage protecting plug, comprise plug body and phase, zero, ground three utmost point latches, phase line, zero line, ground wire, rectification circuit, the 1st controllable silicon, the 2nd controllable silicon, the zero sequence current mutual inductor that phase line and zero line pass, amplifying circuit, the test loop, the ground wire electrified detection inductor that ground wire passes, electromagnetic trip and locker, electromagnetic trip and locker comprise solenoid, the phase line contact, the zero line contact, the ground wire contact, it is characterized in that: between described rectification circuit output end positive pole and negative pole, be connected with by the 1st resistance, the 2nd resistance, the loop that diode is composed in series, described rectification circuit output end is anodal to be connected with the 1st resistance one end, the 1st resistance other end is connected with the 2nd resistance one end, the 2nd resistance other end is connected with diode cathode, and diode cathode is connected with described rectification circuit output end negative pole; Described the 2nd resistance other end also is connected with secondary output one end of described ground wire electrified detection inductor with the tie point of described diode cathode, and the secondary output other end of described ground wire electrified detection inductor is connected with described the 2nd controllable silicon trigger electrode; Described the 2nd controllable silicon anode is connected with negative electrode with described rectification circuit output end is anodal and is connected with negative pole; Described the 1st resistance other end also is connected with described amplifying circuit power end with the tie point of the 2nd resistance one end, and described amplifying circuit ground end is connected with described rectification circuit output end negative pole.