CN202142736U

CN202142736U - Earth leakage protection plug

Info

Publication number: CN202142736U
Application number: CN201120285943U
Authority: CN
Inventors: 刘睿刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-09
Filing date: 2011-08-09
Publication date: 2012-02-08
Anticipated expiration: 2021-08-09

Abstract

The present utility model discloses an earth leakage protection plug which can be used for preventing electric shock accidents caused by electric appliance faults, and electric shock accidents caused by unexpected live-line ground wire. The earth leakage protection plug is provided with a weak current detection inductor, a primary winding and a secondary winding of the weak current detection inductor are insulated and separated, and are all wound on an iron core, and a detection loop formed by connecting the primary winding and current-limiting capacitance-resistance components in series is connected between the ground wire and the zero wire. A second silicon controlled rectifier is arranged in a drive circuit of an electromagnetic coil, an output end of the secondary winding of the weak current detection inductor is connected with the trigger electrode of the second silicon controlled rectifier, the other output end is connected with the anode of a first clamping diode, the anode and the cathode of the second silicon controlled rectifier are respectively connected with the anode and the cathode of the output end of a rectification circuit, and the output ends of a secondary winding of a zero sequence current transformer are respectively connected with the input end of the drive circuit of the electromagnetic coil in parallel.

Description

A kind of leakage protecting plug

Technical field

The utility model relates to Electrical Safety resist technology field, especially relates to a kind of leakage protecting plug.

Background technology

Chinese patent document CN1142618C discloses the leakage protecting plug that a kind of ground wire can open and close; Not only be provided with zero sequence current mutual inductor that phase line and zero line all pass on this leakage protecting plug, also be provided with the ground wire electrified detection inductor that ground wire passes; Therefore it not only can detect between load end phase line and the zero line and have or not residual current; (for example: 10mA), it will be threaded off immediately, cuts off phase line, zero line and ground wire when occurring residual current between phase, the zero line and reaching the threshold values that presets; And when grounding system caused the ground wire accident charged unusually, it can also detect the load end ground wire had the zero accident electric current, and (for example: 10mA), it also can be threaded off immediately, cuts off phase line, zero line and ground wire when ground wire unexpected electric current occurs and reaches the threshold values that presets.

By on can know; Existing leakage protecting plug is exactly must have between load end phase, the zero line must have a mind to extrinsic current on residual current or the load end ground wire and flow through and could thread off in the unexpected precondition that can thread off when charged of the electric leakage of load end fault or ground wire; So just there is following defective in existing leakage protecting plug: during use; No matter be when grounding system ground wire disappearance (for example: the virtual connection of socket ground wire causes no ground connection) and the electric leakage of leakage protecting plug load end consuming device insulation fault; Still when grounding system unusual (for example: phase line, earth short) causes the ground wire accident charged; Dangerous voltage on the exposed metal parts band of consuming device is caused in the capital; But they all do not constitute the loop thereby also do not produce the unexpected electric current of residual current or ground wire, so, although consuming device exposed metal parts have been with dangerous voltage; But existing leakage protecting plug can not threaded off in this case automatically; Have only when human body or livestock touch these with the exposed metal parts that power on, just form the loop, leakage protecting plug is threaded off and phase line, zero line, ground wire disconnection in 0.1S thereby produce residual current or the unexpected electric current of ground wire through human body or livestock; Though in time threading off, it has protected the life security of people or livestock; But existing leakage protecting plug be in this case must be earlier through human body or livestock get an electric shock produce residual current or the unexpected electric current of ground wire and flow through human body or livestock after, it could thread off phase line, zero line, ground wire disconnection, still can cause the electric shock accidents of human body or livestock so have leakage protecting plug now.

Summary of the invention

The purpose of the utility model is to provide a kind of leakage protecting plug that can overcome above-mentioned existing leakage protecting plug defective; Electric leakage or load end ground wire not only can take place in load end phase, zero line road and meet accident and can all break off phase line contact, zero line contact and ground wire contact in time when charged in it; And it when the ground protection system ground connection disappearance (for example: the virtual connection of socket ground wire causes no ground connection) and the electric leakage of leakage protecting plug load end consuming device occur and causes on the electric appliance casing band dangerous voltage or grounding system can also touch consuming device people or livestock when taking place to cause the ground wire accident to be with dangerous voltage unusually and will thread off automatically before; In time break off phase line, zero line and ground wire, for people provide higher leakage protecting plug of reliability and better Electrical Safety guarantee.

The technical solution that the utility model proposed is such:

A kind of leakage protecting plug; Comprise zero sequence current mutual inductor, test loop, electromagnetic trip and locker that shell and latch, phase line, zero line, ground wire, phase line and zero line all pass; This electromagnetic trip and locker comprise solenoid and drive circuit, contact, spring, push rod resets; The drive circuit of said solenoid mainly is made up of rectification circuit, the 1st controllable silicon; Between said rectification circuit output end positive pole and negative pole, be connected with the loop that is in series by the 1st resistance, the 2nd resistance, the 1st clamp diode; Said 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, and the 2nd resistance other end is connected with the 1st clamp diode is anodal, and the 1st clamp diode negative pole is connected with said rectification circuit output end negative pole; Said the 1st resistance other end also is connected with stabilized voltage power supply one end respectively with the 2nd resistance one end; The stabilized voltage power supply other end is connected with said rectification circuit output end negative pole, also is provided with weak current and detects inductor, and said weak current detects inductor and is provided with iron core, elementary winding and secondary winding; Said weak current detects the elementary winding of inductor and said weak current detects the inductor secondary winding all on said weak current detection inductor iron core; Said weak current detects between elementary winding of inductor and the secondary winding and insulate separately, between ground wire and zero line, is connected with the detection loop that is in series by said weak current detection elementary winding of inductor and current limliting Resistor-Capacitor Unit, in the drive circuit of said solenoid, also is provided with the 2nd controllable silicon; Said weak current detects inductor secondary winding one output and is connected with the 2nd controllable silicon trigger electrode; Its another output is connected with said the 1st clamp diode is anodal, and the 2nd controllable silicon anode is connected with negative pole with said rectification circuit output end positive pole respectively with negative electrode, and said zero sequence current mutual inductor secondary winding output is connected in parallel with the drive circuit input of said solenoid respectively.

Said stabilized voltage power supply one end and the said stabilized voltage power supply other end are respectively the voltage stabilizing didoe negative pole with anodal.

The drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, amplifying circuit and the 2nd controllable silicon, power end that said stabilized voltage power supply one end and the said stabilized voltage power supply other end are respectively this amplifying circuits and ground end.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, amplifying circuit and the 2nd controllable silicon; Said zero sequence current mutual inductor secondary winding output is connected in parallel with input amplifier respectively; Amplifying circuit triggers output and is connected with said the 1st controllable silicon trigger electrode; Said the 1st controllable silicon anode is connected with negative pole with said rectification circuit output end is anodal respectively with negative electrode, supplies power to solenoid through triggering the 1st controllable silicon and rectification circuit.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon and the 2nd controllable silicon; Said zero sequence current mutual inductor secondary winding output is parallelly connected with negative electrode with said the 1st controllable silicon trigger electrode respectively; Said the 1st controllable silicon anode is connected with negative pole with said rectification circuit output end is anodal respectively with negative electrode, supplies power to solenoid through triggering the 1st controllable silicon and rectification circuit.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 2nd clamp diode, the 3rd resistance and the 2nd controllable silicon; Be parallel with the loop that is in series by the 3rd resistance and the 2nd clamp diode between the tie point of said the 1st resistance other end and the 2nd resistance one end and the rectification circuit output end negative pole; The 1st resistance other end, the 2nd resistance one end are connected with the 3rd resistance one end respectively; The 3rd resistance other end is connected with the 2nd clamp diode is anodal, and the 2nd clamp diode negative pole is connected with said rectification circuit output end negative pole; Said zero sequence current mutual inductor secondary winding one output is connected with said the 1st controllable silicon trigger electrode; Its another output is connected with the 2nd clamp diode is anodal; Said the 1st controllable silicon anode is connected with negative pole with said rectification circuit output end is anodal respectively with negative electrode, supplies power to solenoid through triggering the 1st controllable silicon and rectification circuit.

Said current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.

Said weak current detects the inductor iron core and is processed by permalloy or amorphous alloy or ultramicro-crystal alloy material.

Said weak current detects between ground wire and the zero line that detection loop that the elementary winding of inductor and current limliting Resistor-Capacitor Unit be in series is connected power end or between the ground wire and zero line of load end.

The substantive features of the utility model be except the same with the leakage protecting plug of prior art can detect have or not residual current between load phase, the zero line and detect ground wire whether charged, when between phase, the zero line and ground wire break down respectively or simultaneously Shi Douhui move immediately all break off phase, zero, ground wire; Be that also leakage protecting plug of the present invention is provided with the detection loop that is in series by weak current detection inductor and current limliting Resistor-Capacitor Unit between ground wire and line; And the detection, induction output that detect weak current inductor and the detection that triggers silicon controlled circuit and zero sequence current mutual inductor, induction output and trigger the silicon controlled circuit and independently divide and be arranged; Detect also can not cause when inductor has signal to export simultaneously with zero-sequence current and interact when weak current detects inductor like this; When causing the ground wire accident unusually, grounding system is with dangerous voltage or when grounding system ground connection disappearance and consuming device electric leakage cause on exposed metal parts and the ground tape dangerous voltage; It can detect, respond to the output signal automatically and leakage protecting plug is threaded off automatically; Break off phase line, zero line, ground wire, thus realized human body or livestock touch these with on just break off phase line, zero line, ground wire entirely before the exposed metal parts of dangerous voltage.

Compared with prior art, the utlity model has following beneficial effect:

(1), the leakage protecting plug of the utility model is owing to be connected with the detection loop that is composed in series by weak current detection elementary winding of inductor and current limliting Resistor-Capacitor Unit between ground wire and zero line; When in use; In case when electric leakage of the consuming device fault on leakage protecting plug load end phase, the zero line and grounding system ground wire disappearance (for example: the virtual connection of socket ground wire causes no ground connection); Metal parts that consuming device exposes and leakage protecting plug ground wire all can be with dangerous voltage; Weak current detects inductor will detect, responds to and export signal; Leakage protecting plug, human body or livestock just can in time be broken off phase line, zero line and ground wire before touching consuming device entirely; It must human body than existing leakage protecting plug in this case the time or livestock touch and flow through could thread off after the residual current better technical solution is provided, so it is more safer than existing leakage protecting plug.

(2), the leakage protecting plug of the utility model is owing to be connected with the detection loop that is composed in series by weak current detection elementary winding of inductor and current limliting Resistor-Capacitor Unit between ground wire and zero line; When in use; When in case grounding system causes the ground wire accident to be with dangerous voltage unusually; Weak current detects inductor will detect, responds to and export signal; Leakage protecting plug, human body or livestock just can in time be broken off phase line, zero line and ground wire before touching electrical equipment entirely; It must human body than existing leakage protecting plug in this case the time or livestock touch and flow through could thread off after the unexpected electric current of ground wire better technical solution is provided, so it is more safer than existing leakage protecting plug.

(3), the leakage protecting plug of the utility model is because the elementary winding of weak current detection inductor that is connected between ground wire and the zero line also can detect, responds to and export signal to the low current signal that flows through it; And this elementary winding do not have the restriction of minimum starting voltage, thus it to ground wire with the voltage height unrestricted, reach the threshold values (for example: 10 microamperes) that presets as long as flow through the electric current that weak current detects the elementary winding of inductor; Leakage protecting plug of the present invention will be threaded off; Therefore it not only ground wire (or consuming device exposed metal parts) with dangerous voltage highly can thread off during for 250V, and ground wire with voltage when being low to moderate predetermined 36V safe voltage (or lower, for example: 24V) also can reliably thread off; When ground wire with voltage when being lower than predetermined 36V safe voltage; It just need not threaded off to avoid misoperation, and the voltage range that it can shield is wide, so; Leakage protecting plug of the present invention not only uses well, and safety and reliability.

(4), the leakage protecting plug of the utility model also can be threaded off when the phase line of power end and zero line reversal connection automatically; Can not reset; Have only just coming into operation after the correction of the wiring state of supply socket phase line and zero line; Forcibly standard the user side supply socket wiring requirement that must meet national regulation connect, in case other contingencies take place when using.

(5), the leakage protecting plug of the utility model detect detection, the induction output of inductor to weak current and trigger that the silicon controlled circuit detects with zero sequence current mutual inductor, induction output and triggering silicon controlled circuit independently divide and be arranged; Detect also can not cause when inductor has signal to export simultaneously with zero-sequence current and interfere with each other when weak current detects inductor like this; Also solved simultaneously and when a shared amplifying circuit lost efficacy, caused the creepage protection function of consuming device and the problem that the unexpected charged defencive function of ground wire was lost efficacy simultaneously, thus safer and reliable.

(6), the leakage protecting plug of the utility model need not be provided with ground wire electrified detection inductor or the instrument transformer that ground wire passes on ground wire, phase, zero, ground wire also need not pass weak current and detect inductor, therefore, provide cost savings.

(7), the leakage protecting plug of the utility model is also ingenious is superimposed upon weak current detection inductor secondary winding output signal on the conduction voltage drop of the 1st clamp diode; Make weak current is detected inductor secondary winding output voltage requirement reduction, thereby reduced cost.

The leakage protecting plug of the utility model is mainly used on the earth leakage protective of various household electrical appliance.

Description of drawings

Fig. 1 is the leakage protecting plug electrical principle sketch map of the utility model embodiment 1, and its zero sequence current mutual inductor secondary winding output is connected in parallel with input amplifier respectively, adopts the voltage stabilizing didoe voltage stabilizing.

Fig. 2 is the leakage protecting plug electrical principle sketch map of the utility model embodiment 2, and its zero sequence current mutual inductor secondary winding output is connected in parallel with input amplifier respectively, utilizes the power end and ground end voltage stabilizing of amplifying circuit.

Fig. 3 is the leakage protecting plug electrical principle sketch map of the utility model embodiment 3, and its zero sequence current mutual inductor secondary winding output is connected in parallel with the 1st controllable silicon trigger electrode and negative electrode respectively, adopts the voltage stabilizing didoe voltage stabilizing.

Fig. 4 is the leakage protecting plug electrical principle sketch map of the utility model embodiment 4; Its zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode; Its another output is connected with the 2nd clamp diode is anodal, adopts the voltage stabilizing didoe voltage stabilizing.

Embodiment

Through following embodiment the utility model is done further to set forth in detail.

Embodiment 1:

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 the 12, the 1st controllable silicon the 13, the 2nd controllable silicon 19, zero sequence current mutual inductor 15, test loop 16, the weak current of three utmost point latches, power end detect inductor 18, current limliting Resistor-Capacitor Unit 17, load end phase line 8, zero line 9, ground wire 10, amplifying circuit the 23, the 1st resistance the 22, the 2nd resistance the 21, the 1st clamp diode 20, voltage stabilizing didoe 14, electromagnetic trip and locker and form.Electromagnetic trip and locker mainly are made up of 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, the push rod that resets.Be connected with the loop that is composed in series by the 1st resistance the 22, the 2nd resistance the 21, the 1st clamp diode 20 between rectification circuit 12 output head anodes and the negative pole; Rectification circuit 12 output head anodes are connected with the 1st resistance 22 1 ends; The 1st resistance 22 other ends are connected with the 2nd resistance 21 1 ends; The 2nd resistance 21 other ends and 20 anodal connections of the 1st clamp diode; The 1st clamp diode 20 negative poles are connected with rectification circuit 12 negative pole of output end, and the 1st resistance 22 other ends are connected with voltage stabilizing didoe 14 negative poles with the tie point of the 2nd resistance 21 1 ends, and voltage stabilizing didoe 14 positive poles are connected with the rectification circuit output end negative pole.The detection loop that is composed in series by weak current detection inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected between the ground wire 7 and zero line 6 of power end; Weak current detects inductor 18 secondary winding one output and is connected with the 2nd controllable silicon 19 trigger electrodes; Its another output is connected with negative pole with rectification circuit output end is anodal respectively with negative electrode with 20 anodal connections of the 1st clamp diode, the 2nd controllable silicon 19 anodes.

In the present embodiment; Current limliting Resistor-Capacitor Unit 17 is a resistance; Also can adopt electric capacity or resistance and capacitance component; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon 13, amplifying circuit 23 and the 2nd controllable silicon 19; Zero sequence current mutual inductor 15 secondary winding outputs and amplifying circuit 23 inputs are connected in parallel, and amplifying circuit 23 triggers output and is connected with the 1st controllable silicon 13 trigger electrodes, and the 1st controllable silicon 13 anodes are connected with negative pole with rectification circuit 12 output head anodes respectively with negative electrode; The signal of zero sequence current mutual inductor 15 secondary winding output triggers 13 conductings of the 1st controllable silicon after amplifying circuit 23 amplifies, to solenoid 11 power supplies leakage protecting plug is threaded off through the 1st controllable silicon 13 and rectification circuit 12.

In the present embodiment; The iron core that weak current detects inductor 18 adopts the ultramicro-crystal alloy material to process; Also can adopt amorphous alloy or permalloy material to process; Stabilized voltage power supply is a voltage stabilizing didoe 14, and weak current detects the detection loop that inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 be in series and is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected load end.

During use; Press the push rod that resets of leakage protecting plug; 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 are connected with phase line 5, zero line 6, the ground wire 7 of power end respectively;

Ground wire

7 and 10 is because the effects of ground connection are clamped at about zero volt voltage, and zero line 6 and 9 also is about zero volt simultaneously, is connected the ground wire 7 of leakage protecting plug power end and electric current that the detection of the weak current between the zero line 6 inductor 18 elementary windings just do not have electric current to flow through or flow through and do not reach the threshold values (for example: 10 microamperes) that presets; And the rectification circuit 12 that is connected between phase line 8 and the zero line 9 gets; The 1st clamp diode 20 on the clamp circuit is through the 1st resistance the 22, the 2nd resistance 21 step-down current limlitings, voltage stabilizing didoe 14 voltage stabilizings and conducting, and the forward voltage of its positive terminal is clamped at about about 0.3V after 20 conductings of the 1st clamp diode, owing to this clamp voltage also is not enough to trigger 19 conductings of the 2nd controllable silicon; Leakage protecting plug just remains on the "on" position that resets like this, thereby for the power supply of the consuming device of its lower end with ground connection is provided.

During use; If the consuming device fault on the phase line of load end 8, the zero line 9 electric leakage and in the normal situation of ground protection system following time; Can produce a residual current through

ground wire

10 and 7; Zero sequence current mutual inductor 15 can detect the residual current between phase, the zero line and export a signal and give amplifying circuit 23; And when residual current reaches predefined threshold values (for example: 10 milliamperes); The 1st controllable silicon 13 will be exaggerated circuit 23 triggering and conducting, and the solenoid 11 on electromagnetic trip and the locker gets the electric leakage protecting plug that makes and threads off, and before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4; If the consuming device fault on the phase line of load end 8, the zero line 9 electric leakage and when not having ground connection (for example: the ground wire virtual connection causes no ground connection on the socket) in the ground protection system; Metal parts that consuming device exposes and leakage protecting

plug ground wire

10 and 7 all can be with dangerous voltage; Being connected weak current between leakage protecting plug power end ground wire 7 and the zero line 6 detects inductor 18 elementary windings and just has a weak current and flow through; Weak current detects inductor 18 secondary winding can export a signal; This signal will be superimposed upon the about 0.3V of the 1st clamp diode 20 forward conduction voltage drops and go up to the 2nd controllable silicon 19; And when weak current reaches predefined threshold values (for example: 10 microamperes); The 2nd controllable silicon 19 can be detected inductor 18 triggering and conducting by weak current; Solenoid 11 on electromagnetic trip and the locker gets the electric leakage protecting plug that makes and threads off, and before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, thereby protect people's Electrical Safety better.

During use; If the ground protection system takes place to cause

ground wire

7 and 10 accidents to be with dangerous voltage unusually; Ground wire 7 and the weak current between the zero line 6 that is connected power end like this detects inductor 18 elementary windings and just has a weak current and flow through; Weak current detects inductor 18 secondary winding can export a signal; This signal will be superimposed upon the about 0.3V of the 1st clamp diode 20 forward conduction voltage drops and go up to the 2nd controllable silicon 19; And when weak current reaches predefined threshold values (for example: 10 microamperes), the 2nd controllable silicon 19 will be detected inductor 18 triggering and conducting by weak current, and the solenoid 11 on electromagnetic trip and the locker gets the electric leakage protecting plug that makes and threads off; Before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, thereby protect people's Electrical Safety better.

During use; If the consuming device fault on the phase line of load end 8, the zero line 9 electric leakage and grounding system cause ground wire 7 unusually and 10 accident is charged when taking place simultaneously; Zero sequence current mutual inductor 15 secondary winding can be exported a signal and give amplifying circuit 23, and when reaching the threshold values that presets, 13 conductings of amplifying circuit 23 output signal triggering the 1st controllable silicon; Likewise; Weak current detects inductor 18 secondary winding also can export a signal to the 2nd controllable silicon 19, and when reaching the threshold values that presets, weak current detects inductor 18 and triggers 19 conductings of the 2nd controllable silicon; As long as like this with regard to reached the 1st controllable silicon 13 that is connected in parallel and any conducting that is triggered among the 2nd controllable silicon 19 all can make solenoid 11 electric and leakage protecting plug is threaded off; And export and trigger the silicon controlled process to the detection of signal, induction and independently separate, do not interfere with one another thereby make between them, thereby protected people's safety better and improved reliability.

Embodiment 2:

Referring to shown in Figure 2; Compare with embodiment 1; Cancelled embodiment 1 described voltage stabilizing didoe 14 in the present embodiment, and be connected the 1st resistance 22 other ends with the tie point of the 2nd resistance 21 1 ends and the power end+VS of amplifying circuit 23, the ground end GND of this amplifying circuit 23 is connected with rectification circuit 12 negative pole of output end; Utilized the built-in voltage of voltage regulation of amplifying circuit 23, need not to increase in addition the voltage stabilizing didoe voltage stabilizing and just can reach same technique effect.

In this example; The iron core that weak current detects inductor 18 adopts the ultramicro-crystal alloy material to process; Also can adopt amorphous alloy or permalloy material to process; Utilize the power end+VS of amplifying circuit 23 to hold GND as stabilized voltage power supply with ground; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon 13, amplifying circuit 23 and the 2nd controllable silicon 19, and weak current detects the detection loop that inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 be in series and is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected load end.

Because the remaining circuit structure of present embodiment leakage protecting plug is all identical with embodiment 1, only be that the stabilized voltage power supply utilized is different, do not give unnecessary details at this.

Embodiment 3:

Referring to shown in Figure 3; Compare with embodiment 1; Present embodiment has been cancelled embodiment 1 described amplifying circuit 23 in the drive circuit of solenoid; And zero sequence current mutual inductor 15 secondary winding outputs by being connected in parallel with embodiment 1 described amplifying circuit 23 inputs the 1st controllable silicon 13 trigger electrodes and the negative electrode that changes to respectively with present embodiment that be connected in parallel respectively; The anode of the 1st controllable silicon 13 is connected with negative pole with the positive pole of rectification circuit 12 outputs respectively with negative electrode; Make the signal of zero sequence current mutual inductor 15 secondary winding output directly trigger the 1st controllable silicon 13,, just can not trigger the 1st controllable silicon 13 so need not amplify because the signal of said zero sequence current mutual inductor 15 secondary winding output is enough big.

In the present embodiment; Current limliting Resistor-Capacitor Unit 17 is a current-limiting resistance; Also can adopt electric capacity or resistance and capacitance component; The drive circuit of solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon 13 and the 2nd controllable silicon 19; Zero sequence current mutual inductor 15 secondary winding outputs are connected in parallel with the 1st controllable silicon 13 trigger electrodes and negative electrode respectively, and the 1st controllable silicon 13 anodes are connected with negative pole with rectification circuit 12 output head anodes respectively with negative electrode, to solenoid 11 power supplies leakage protecting plug are threaded off with rectification circuit 12 through triggering the 1st controllable silicon 13.

In the present embodiment; The iron core that weak current detects inductor 18 adopts the ultramicro-crystal alloy material to process; Also can adopt amorphous alloy or permalloy material to process; Weak current detects the detection loop that inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 be in series and is connected between the ground wire 10 and zero line 9 of load end, also can detect this between ground wire 7 and zero line 6 that loop is connected power end.

Weak current detects inductor 18 secondary winding outputs and is connected in parallel with the 2nd controllable silicon 19 trigger electrodes and negative electrode respectively, and the 2nd controllable silicon 19 anodes are connected with negative pole with rectification circuit 12 output head anodes respectively with negative electrode.

Because the remaining circuit structure of present embodiment leakage protecting plug is all identical with embodiment 1, only be the control mode difference that triggers the 1st controllable silicon 13, do not give unnecessary details at this.

Embodiment 4:

Referring to shown in Figure 4, to compare with embodiment 3, present embodiment has increased the 2nd clamp diode 25 anodal clamp circuits that are in series by the 3rd resistance the 24, the 2nd clamp diode 25 in the drive circuit of solenoid.The 3rd resistance 24 1 ends are connected with the 1st resistance 22 other ends, the 2nd resistance 21 1 ends and voltage stabilizing didoe 14 negative poles respectively; The 3rd resistance 24 other ends and 25 anodal connections of the 2nd clamp diode, the 2nd clamp diode 25 negative poles are connected with rectification circuit 12 negative pole of output end, voltage stabilizing didoe 14 positive poles respectively.

In the present embodiment; Current limliting Resistor-Capacitor Unit 17 is a current-limiting resistance; Also can adopt electric capacity or resistance and capacitance component; The drive circuit of solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 2nd clamp diode the 25, the 3rd resistance 24 and the 2nd controllable silicon 19; Zero sequence current mutual inductor 15 secondary winding one output is connected with the 1st controllable silicon 13 trigger electrodes; Its another output and the 2nd clamp diode 25 are anodal to be connected, and the 1st controllable silicon 13 anodes are connected with negative pole with rectification circuit 12 output head anodes respectively with negative electrode, and the signal that zero sequence current mutual inductor 15 secondary winding are exported is superimposed upon on the basis of the 2nd clamp diode 25 conduction voltage drops (about 0.3V) and triggers 13 conductings of the 1st controllable silicon; To solenoid 11 power supplies leakage protecting plug is threaded off through the 1st controllable silicon 13 and rectification circuit 12, thereby reduced requirement zero sequence current mutual inductor 15 secondary winding output voltages.

In the present embodiment; The iron core that weak current detects inductor 18 adopts the ultramicro-crystal alloy material to process; Also can adopt amorphous alloy or permalloy material to process; Weak current detects the detection loop that inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 be in series and is connected between the ground wire 7 and zero line 6 of power end, also can detect this between ground wire 10 and zero line 9 that loop is connected load end.

Weak current detects inductor 18 secondary winding one output and is connected with the 2nd controllable silicon 19 trigger electrodes, its another output and 20 anodal connections of clamp diode, and the 2nd controllable silicon 19 anodes are connected with negative pole with rectification circuit 12 output head anodes respectively with negative electrode.

Claims

1. leakage protecting plug; Comprise zero sequence current mutual inductor, test loop, electromagnetic trip and locker that shell and latch, phase line, zero line, ground wire, phase line and zero line all pass; This electromagnetic trip and locker comprise solenoid and drive circuit, contact, spring, push rod resets; The drive circuit of said solenoid mainly is made up of rectification circuit, the 1st controllable silicon; It is characterized in that: between said rectification circuit output end positive pole and negative pole, be connected with the loop that is in series by the 1st resistance, the 2nd resistance, the 1st clamp diode, said rectification circuit output end is anodal to be connected with the 1st resistance one end, and the 1st resistance other end is connected with the 2nd resistance one end; The 2nd resistance other end is connected with the 1st clamp diode is anodal; The 1st clamp diode negative pole is connected with said rectification circuit output end negative pole, and said the 1st resistance other end also is connected with stabilized voltage power supply one end respectively with the 2nd resistance one end, and the stabilized voltage power supply other end is connected with said rectification circuit output end negative pole; Also be provided with weak current and detect inductor; Said weak current detects inductor and is provided with iron core, elementary winding and secondary winding; Said weak current detects the elementary winding of inductor and said weak current detection inductor secondary winding all detects on the inductor iron core around said weak current, and said weak current detects and insulate between elementary winding of inductor and the secondary winding separately; Between ground wire and zero line, be connected with the detection loop that is in series by said weak current detection elementary winding of inductor and current limliting Resistor-Capacitor Unit; In the drive circuit of said solenoid, also be provided with the 2nd controllable silicon; Said weak current detects inductor secondary winding one output and is connected with the 2nd controllable silicon trigger electrode, and its another output is connected with said the 1st clamp diode is anodal, and the 2nd controllable silicon anode is connected with negative pole with said rectification circuit output end is anodal respectively with negative electrode; Said zero sequence current mutual inductor secondary winding output is connected in parallel with the drive circuit input of said solenoid respectively.

2. leakage protecting plug according to claim 1 is characterized in that: said stabilized voltage power supply one end and the said stabilized voltage power supply other end are respectively the voltage stabilizing didoe negative pole with anodal.

3. leakage protecting plug according to claim 1; It is characterized in that: the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, amplifying circuit and the 2nd controllable silicon, power end that said stabilized voltage power supply one end and the said stabilized voltage power supply other end are respectively this amplifying circuits and ground end.

4. leakage protecting plug according to claim 1; It is characterized in that: the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, amplifying circuit and the 2nd controllable silicon; Said zero sequence current mutual inductor secondary winding output is connected in parallel with input amplifier respectively; Amplifying circuit triggers output and is connected with said the 1st controllable silicon trigger electrode; Said the 1st controllable silicon anode is connected with negative pole with said rectification circuit output end is anodal respectively with negative electrode, supplies power to solenoid through triggering the 1st controllable silicon and rectification circuit.

5. leakage protecting plug according to claim 1; It is characterized in that: the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon and the 2nd controllable silicon; Said zero sequence current mutual inductor secondary winding output is parallelly connected with negative electrode with said the 1st controllable silicon trigger electrode respectively; Said the 1st controllable silicon anode is connected with negative pole with said rectification circuit output end is anodal respectively with negative electrode, supplies power to solenoid through triggering the 1st controllable silicon and rectification circuit.

6. leakage protecting plug according to claim 1 is characterized in that: the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 2nd clamp diode, the 3rd resistance and the 2nd controllable silicon; Be parallel with the loop that is in series by the 3rd resistance and the 2nd clamp diode between the tie point of said the 1st resistance other end and the 2nd resistance one end and the rectification circuit output end negative pole; The 1st resistance other end, the 2nd resistance one end are connected with the 3rd resistance one end respectively; The 3rd resistance other end is connected with the 2nd clamp diode is anodal, and the 2nd clamp diode negative pole is connected with said rectification circuit output end negative pole; Said zero sequence current mutual inductor secondary winding one output is connected with said the 1st controllable silicon trigger electrode; Its another output is connected with the 2nd clamp diode is anodal; Said the 1st controllable silicon anode is connected with negative pole with said rectification circuit output end is anodal respectively with negative electrode, supplies power to solenoid through triggering the 1st controllable silicon and rectification circuit.

7. leakage protecting plug according to claim 1 is characterized in that: said current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.

8. leakage protecting plug according to claim 1 is characterized in that: said weak current detects inductor

Iron core is processed by permalloy or amorphous alloy or ultramicro-crystal alloy material.

9. leakage protecting plug according to claim 1 is characterized in that: said weak current detects between ground wire and the zero line that detection loop that the elementary winding of inductor and current limliting Resistor-Capacitor Unit be in series is connected power end or between the ground wire and zero line of load end.