CN202183530U

CN202183530U - Electric leakage protection plug with alarming device

Info

Publication number: CN202183530U
Application number: CN201120303690XU
Authority: CN
Inventors: 刘睿刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-19
Filing date: 2011-08-19
Publication date: 2012-04-04
Anticipated expiration: 2021-08-19

Abstract

The utility model discloses an electric leakage protection plug with an alarming device, which not only can prevent electric shock accidents caused by electrical equipment faults, but also can prevent electric shock accidents caused by the condition that an earth wire is electrified accidently. A phase wire, an electrification detection circuit for the earth wire is connected among a zero wire, an earth wire and a phase wire of a power end of the plug, and comprises a rectification voltage-reducing and voltage-stabilizing circuit, a voltage comparison circuit, an alarm lamp and a photoelectrical coupling circuit, through the comparison of the voltage of the earth wire and reference voltage, the plug can do motion of tripping electricity cutting and the alarm indication once the earth wire is powered with dangerous voltage.

Description

A kind of band warning device leakage protecting plug

Technical field

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

Background technology

It is the leakage protecting plug that a kind of ground wire of CN1142618C can open and close that the Chinese patent document discloses publication number; Not only be provided with the 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 the ground protection system exception causes the ground wire accident charged; It can also detect the load end ground wire has the zero accident electric current; (for example: 10mA), it also can be threaded off immediately, cuts off phase line, zero line and ground wire when ground wire unexpected electric current occurs and reaches the threshold values that presets.

Hence one can see that, existing leakage protecting plug in the unexpected precondition that can thread off when charged of the electric leakage of load end fault or ground wire exactly: must have between load end phase, the zero line and must have a mind to extrinsic current on residual current or the load end ground wire and flow through.So just there is following defective in existing leakage protecting plug: during use; No matter be when ground protection system ground wire disappearance (for example: the virtual connection of socket ground wire causes no ground connection) or the electric leakage of leakage protecting plug load end consuming device insulation fault; Still when ground protection system exception (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 loop of electric leakage, thereby also do not produce the unexpected electric current of residual current or ground wire.Although consuming device exposed metal parts have been with dangerous voltage, existing leakage protecting plug can not threaded off in this case automatically; Have only when people or livestock touch these with the exposed metal parts that power on, just form loop of electric leakage, 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 people 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 people or livestock get an electric shock produce residual current or ground wire accident electric current and flow through the people or livestock after; It could be threaded off and break off phase line, zero line, ground wire, so existing leakage protecting plug still can cause the electric shock of people or livestock.

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, and it not only can electric leakage or ground wire 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; And can also ground connection disappearance (for example: the virtual connection of socket ground wire causes no ground connection) and leakage protecting plug load end consuming device occur in the ground protection system and leak electricity when causing on the electric appliance casing band dangerous voltage; Or the ground protection system is when taking place to cause the situation of ground tape dangerous voltage unusually; People or livestock just can be threaded off before touching consuming device automatically; In time break off phase line, zero line and ground wire, for people provide leakage protecting plug and Electrical Safety guarantee more reliably.

The technical solution that the utility model proposed is following:

A kind of band warning device leakage protecting plug; Comprise zero sequence current mutual inductor 15, test loop, electromagnetic trip and locker that shell and latch, phase line 6, zero line 5, ground wire 7, phase line 6 and zero line 5 all pass; This electromagnetic trip and locker comprise solenoid 11 and drive circuit 34, contact, spring, push rod resets; Said drive circuit 34 mainly is made up of rectification circuit 12, controllable silicon 13; Be connected with ground wire electrified detection warning circuit 33 between the phase line 6 of said power end, zero line 5 and the ground wire 7; This ground wire electrified detection circuit 33 is made up of rectification decompression voltage regulator 23, voltage comparator circuit 29, alarm lamp and photoelectricity coupling circuit, and the power end of photoelectricity coupling circuit is connected with rectification circuit 12 outputs, and photoelectric coupled circuit output end is connected with the trigger electrode of controllable silicon 13.

When the leakage protecting plug of band warning device inserted power end, ground wire electrified detection circuit 33 was just started working, and voltage comparator circuit 29 can compare the reference voltage of ground wire 7 voltages and setting.Charged and reach when setting threshold values when ground wire 7, voltage comparator circuit 29 can make light-emitting diode 30 conductings light, and makes the luminous tube conducting in the photoelectrical coupler; Thereby make the also conducting of phototriode in the photoelectrical coupler, trigger the controllable silicon 13 of drive circuit 34, make solenoid 11 actions; Break off phase, zero-sum ground wire; Realized outage, light-emitting diode 30 is lighted warning always simultaneously, reminds the user will get rid of the hidden danger of ground wire electrification as early as possible.

The characteristics of the utility model be except same can detect have or not residual current between load phase, the zero line and detect ground wire whether charged, and between phase, zero line with ground wire break down respectively or simultaneously Shi Douhui move immediately mutually, zero, outside ground wire all breaks off; The power end that also is the leakage protecting plug of the utility model also is connected with the ground wire electrified detection circuit.When causing the ground wire accident, the ground protection system exception is with dangerous voltage; Or ground protection system earth disappearance; Or consuming device electric leakage is when causing on exposed metal parts and the ground tape dangerous voltage; It can detect and report to the police automatically, and leakage protecting plug is threaded off automatically, breaks off phase line, zero line, ground wire.Thereby realized people or livestock touch these with on before the exposed metal parts of dangerous voltage, just break off phase line, zero line, ground wire entirely.

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

(1) the band warning device leakage protecting plug of the utility model is owing to be connected with the ground wire electrified detection circuit at power end; In use; In case the electric leakage of the consuming device fault on leakage protecting plug load end phase, the zero line; Or the ground protection system exception is when causing the ground wire accident to be with dangerous voltage; Metal parts that consuming device exposes and leakage protecting plug ground wire all can be with dangerous voltage, and the ground wire electrified detection circuit just can detect at once, and enforcement is reported to the police and trigger control circuit is cut off the electricity supply and held phase line, zero line and ground wire.Needn't touch and flow through residual current through people or livestock and could thread off afterwards.

(2) the band warning device leakage protecting plug of the utility model is owing to be connected with the ground wire electrified detection circuit at power end; In use; When in case ground protection system ground wire disappearance (the socket ground wire does not have ground connection) and load end consuming device do not have ground connection yet; The ground wire electrified detection circuit just can detect at once, and enforcement is reported to the police and trigger control circuit is cut off the electricity supply and held phase line, zero line and ground wire.Remind user's ground wire unusual.

(3) the band warning device leakage protecting plug of the utility model is owing to be connected with the ground wire electrified detection circuit at power end; In use; Exceed the safe voltage threshold values that presets when lower (like 24V, or) as long as ground wire electrification is pressed, the leakage protecting plug of the utility model just can be threaded off and report to the police.

(4) the band warning device 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 there is potential safety hazard when using.

The band warning device leakage protecting plug of the utility model is applicable on the earth leakage protective of various household electrical appliance.

Description of drawings

Fig. 1 is the band warning device leakage protecting plug electrical principle sketch map of the utility model embodiment 1, and the rectification decompression voltage regulator is used the resistance step-down among the figure, and voltage comparator circuit is with amplifying circuit negative pole input manner of comparison.

Fig. 2 is the band warning device leakage protecting plug electrical principle sketch map of the utility model embodiment 2, and the rectification decompression voltage regulator is used capacitance decompression among the figure, and voltage comparator circuit is with the anodal input of amplifying circuit manner of comparison.

Fig. 3 is another band warning device leakage protecting plug electrical principle sketch map of the utility model embodiment 2, and the signal output part of photoelectricity coupling circuit is connected with the amplifying circuit signal input part of drive circuit among the figure.

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 band warning device leakage protecting plug is mainly by forming with lower component: plug body and phase, zero, phase line 6, zero line 5, ground wire 7, phase line 8, zero line 9, ground wire 10, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4, solenoid 11, spring and the push rod that resets, test loop, drive circuit 34, zero sequence current mutual inductor 15 and the ground wire electrified detection circuit 33 of load end of three utmost point latches, power end form.Drive circuit 34 is by rectification circuit 12, and controllable silicon 13, diode 17, amplifying circuit 14 and the 8th resistance 16 are formed.Ground wire electrified detection circuit 33 is made up of rectification decompression voltage regulator 23, voltage comparator circuit 29, light-emitting diode 30, photoelectrical coupler the 31, the 7th resistance 32 and the 8th resistance 16.Rectification decompression voltage regulator 23 is made up of the 1st diode the 18, the 1st resistance the 19, the 2nd resistance 20, voltage stabilizing didoe 21 and the 1st electric capacity 22.Voltage comparator circuit 29 is made up of the 4th resistance the 24, the 5th resistance the 26, the 6th resistance the 27, the 2nd diode 25 and amplifying circuit 28.

In the present embodiment, be connected with rectification decompression voltage regulator 23 between the phase line 6 of power end, zero line 5 and the ground wire 7.The phase line 6 of power end is connected with the positive pole of the 1st diode 18; The negative pole of the 1st diode 18 is connected with an end of the 1st resistance 19; The other end of the 1st resistance 19 is connected with an end and the negative pole of the voltage stabilizing didoe 21 and positive pole of the 1st electric capacity 22 of the 2nd resistance 20, and the negative pole anodal and the 1st electric capacity 22 of the other end of the 2nd resistance 20 and voltage stabilizing didoe 21 is connected with the zero line 5 of power end.Power supply is through after 18 rectifications of the 1st diode, the

1st resistance

18 and 20 step-downs of the 2nd resistance, voltage stabilizing didoe 23 voltage stabilizings and 22 filtering of the 1st electric capacity; The positive pole of the 1st electric capacity 22 is as the output head anode of rectification decompression voltage regulator 23; The negative pole of the 1st electric capacity 22 provides power supply as the negative pole of output end of rectification decompression voltage regulator 23 to voltage comparator circuit 29.

Voltage comparator circuit 29 is made up of the 4th resistance the 24, the 5th resistance the 26, the 6th resistance the 27, the 2nd diode 25 and amplifying circuit 28.Be connected with the 4th resistance 24 between the positive source of amplifying circuit 28 and its signal electrode input end; The negative input of amplifying circuit 28 is connected with an end of the 5th resistance 26; The other end of the 5th resistance 26 is connected with the negative pole of the 2nd diode 25; The positive pole of the 2nd diode 25 is connected with the ground wire of power end 7, and the positive source of amplifying circuit 28 is connected with the output head anode of rectification decompression voltage regulator 23, and the power cathode of amplifying circuit 28 is connected with the negative pole of output end of rectification decompression voltage regulator 23; The positive source of amplifying circuit 28 is connected with an end of the 6th resistance 27; The other end of the 6th resistance 27 is as the high potential output of voltage comparator circuit 29, and the output of amplifying circuit 28 is as the electronegative potential output of voltage comparator circuit 29, for alarm lamp and photoelectricity coupling circuit provide signal.

Alarm lamp and photoelectricity coupling circuit are made up of light-emitting diode 30, photoelectrical coupler the 31, the 7th resistance 32 and the 8th resistance 16.Luminous tube in the photoelectrical coupler 31 is anodal to be connected with the high potential output of voltage comparator circuit 29; Luminous tube negative pole in the photoelectrical coupler 31 is connected with the positive pole of light-emitting diode 30; Light-emitting diode 30 negative poles are connected with the electronegative potential output of voltage comparator circuit 29; One end of the 8th resistance 16 in the phototriode collector electrode in the photoelectrical coupler 31 and the drive circuit 34 is connected; The other end of the 8th resistance 16 is connected with the cathode output end of rectification circuit 12 in the drive circuit 34; Phototriode emitters in the photoelectrical coupler 31 are connected with an end of the 7th resistance 32, and the other end of the 7th resistance 32 is connected with rectification road 12 cathode output ends in the drive circuit 34, and the trigger electrode of the controllable silicon 13 in the tie point of the interior phototriode emitter of photoelectrical coupler 31 and the 7th resistance 32 and the drive circuit 34 is connected.

Drive circuit 34 is made up of rectification circuit 12, controllable silicon 13, diode 17, amplifying circuit 14 and the 8th resistance 16.The phase line 8 and the zero line 9 of load end pass zero sequence current mutual inductor 15, and as the elementary winding of zero sequence current mutual inductor 15, the secondary winding of zero sequence current mutual inductor 15 is connected with the signal input part of amplifying circuit 14.The phase line 8 of load end is connected with an end of tripping coil 11, and the other end of solenoid 11 is connected with one of them input of rectification circuit 12, and another input of rectification circuit 12 is connected with load end zero line 9.The cathode output end of rectification circuit 12 is connected with the anode of controllable silicon 13, and the cathode output end of rectification circuit 12 is connected with the negative electrode of controllable silicon 13.The cathode output end of rectification circuit 12 is connected with an end of the 8th resistance 16; The other end of the 8th resistance 16 is connected with photoelectrical coupler 31 interior phototriode collector electrodes with the positive source of amplifying circuit 14; One end of the 7th resistance 32 in the power cathode of the cathode output end of rectification circuit 12 and amplifying circuit 14 and the ground wire electrified detection circuit 33 is connected, rectification circuit 12 through the 8th resistance 16 respectively to amplifying circuit 14 and photoelectrical coupler 31 power supplies.

In the use, the push rod that resets of leakage protecting plug is pressed, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1 and ground wire contact 3 and 4 are connected, and the phase line 8 of load end, zero line 9, ground wire 10 are connected with phase line 6, zero line 5, the ground wire 7 of power end respectively.The zero line 5 of power end is zero with the voltage of ground wire 7 during normal condition, has only phase line 6 charged.Phase line 6 and zero line 5 be for the rectification decompression voltage regulator 23 of ground wire electrified detection circuit 33 provides power supply, and rectifying and voltage-stabilizing reduction voltage circuit 23 provides power supply and reference voltage for voltage comparator circuit 29.The 2nd diode 25 in the voltage comparator circuit 29 is connected with ground wire 7, and voltage comparator circuit 29 is through making judgement to the voltage of ground wire 7 and the contrast of reference voltage, output high level or low level.

When the voltage of ground wire 7 and 10 is zero, or with voltage and do not reach when setting threshold values (like 24V), and the output of amplifying circuit 28 still keeps high level; Be connected the light-emitting diode 30 and photoelectrical coupler 31 not conductings (being that alarm lamp does not work) of 29 liang of outputs of voltage comparator circuit, the phototriode in the photoelectrical coupler 31 does not have conducting yet, and controllable silicon 13 is not received triggering signal; Keep cut-off state; Drive circuit 34 does not drive solenoid 11, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1; Ground wire contact 3 and 4 still remains closed.

Non-vanishing and institute is with voltage when setting threshold values (like 24V) when the voltage of ground wire 7 and 10; Or ground wire virtual connection and when causing no ground connection, the output of amplifying circuit 28 then transfers low level to, the light-emitting diode 30 that is connected 29 liang of outputs of voltage comparator circuit (is that alarm lamp is lighted with photoelectrical coupler 31 conductings; Prompting user ground wire electrification); Also conducting immediately of phototriode in the photoelectrical coupler 31, triggering signal is delivered to the trigger electrode of controllable silicon 13, makes it become conducting state by cut-off state; Drive circuit 34 drives solenoid 11 actions, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4 will break off immediately.

Electric leakage and ground protection system exception cause ground wire 7 and 10 accident is charged when taking place simultaneously when the phase line 8 of load end, consuming device on the zero line 9 break down; Owing to residual current occurs through zero sequence current mutual inductor 15; Amplifying circuit 14 in the drive circuit 34 can induced signal processing and amplifying from zero sequence current mutual inductor 15 after, deliver to through diode 17 on the trigger electrode of controllable silicon 13; Simultaneously, also be added on the trigger electrode of controllable silicon 13 from the triggering signal of ground wire electrified detection circuit 33.As long as one of them signal arrives first; Or two signal arrive the trigger electrode of controllable silicon 13 simultaneously; Can both make controllable silicon 13 conductings, drive circuit 34 drives solenoid 11 actions, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4 will break off immediately.

When the zero utmost point of power supply power supply base connects instead with the utmost point mutually, promptly during by reversal connection, zero line 5 is charged with phase line 6 for the zero line 5 of power end, and phase line 6 is a no-voltage with ground wire 7.Rectification decompression voltage regulator 23 in the ground wire electrified detection circuit 33 is in the negative half period work of the sinusoidal alternating current of power end; The voltage of ground wire 7 is higher than the reference voltage of voltage comparator circuit 29 at this moment; Then amplifying circuit 28 outputs are low level; Be connected the light-emitting diode 30 and photoelectrical coupler 31 conductings (be that alarm lamp is lighted, prompting user power end zero connects instead mutually), the also conducting immediately of phototriode in the photoelectrical coupler 31 of 29 liang of outputs of voltage comparator circuit; Triggering signal is delivered to the trigger electrode of controllable silicon 13; Make it become conducting state by cut-off state, drive circuit 34 drives solenoid 11 actions, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4 will break off immediately.

Embodiment 2

Referring to shown in Figure 2, a kind of band warning device leakage protecting plug is mainly by forming with lower component: plug body and phase, zero, phase line 6, zero line 5, ground wire 7, phase line 8, zero line 9, ground wire 10, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4, solenoid 11, spring and the push rod that resets, test loop, drive circuit 34, zero sequence current mutual inductor 15 and the ground wire electrified detection circuit 33 of load end of three utmost point latches, power end form.Drive circuit 34 is made up of rectification circuit 12, controllable silicon 13, diode 17, amplifying circuit 14 and the 9th resistance 16.Ground wire electrified detection circuit 33 is made up of rectification decompression voltage regulator 23, voltage comparator circuit 29, light-emitting diode 30, photoelectrical coupler the 31, the 7th resistance 32 and the 8th resistance 16.Rectification decompression voltage regulator 23 is made up of the 1st diode the 18, the 3rd resistance the 35, the 2nd electric capacity 36, voltage stabilizing didoe 21 and the 1st electric capacity 22.Voltage comparator circuit 29 is made up of the 4th resistance the 24, the 5th resistance the 26, the 6th resistance the 27, the 2nd diode 25 and amplifying circuit 28.

In the present embodiment, be connected with rectification decompression voltage regulator 23 between the phase line 6 of power end, zero line 5 and the ground wire 7.The phase line 6 of power end is connected with the positive pole of the 1st diode 18; The negative pole of the 1st diode 18 is connected with an end of the 3rd resistance 25; The 3rd resistance 25 and the 2nd electric capacity 36 are connected in parallel; The other end of the 3rd resistance 25 is connected with the negative pole of voltage stabilizing didoe 21 and the positive pole of the 1st electric capacity 22, and the negative pole anodal and the 1st electric capacity 22 of voltage stabilizing didoe 21 is connected with the zero line 5 of power end.After power end passes through 18 rectifications of the 1st diode and 36 step-downs of the 2nd electric capacity, voltage stabilizing didoe 21 voltage stabilizings and 22 filtering of the 1st electric capacity; The positive pole of the 1st electric capacity 22 is as the output head anode of rectification decompression voltage regulator 23; The negative pole of the 1st electric capacity 22 provides power supply as the negative pole of output end of rectification decompression voltage regulator 23 to voltage comparator circuit 29.

Voltage comparator circuit 29 is made up of the 4th resistance the 24, the 5th resistance the 26, the 6th resistance the 27, the 2nd diode 25 and amplifying circuit 28.Be connected with the 4th resistance 24 between the positive source of amplifying circuit 28 and its signal negative input; The electrode input end of amplifying circuit 28 is connected with an end of the 5th resistance 26; The other end of the 5th resistance 26 is connected with the negative pole of the 2nd diode 25; The positive pole of the 2nd diode 25 is connected with the ground wire of power end 7, and the positive source of amplifying circuit 28 is connected with the output head anode of rectification decompression voltage regulator 23, and the power cathode of amplifying circuit 28 is connected with the negative pole of output end of rectification decompression voltage regulator 23; The power cathode of amplifying circuit 28 is connected with an end of the 6th resistance 27; The other end of the 6th resistance 27 is as the electronegative potential output of voltage comparator circuit 29, and the output of amplifying circuit 28 is as the high potential output of voltage comparator circuit 29, for alarm lamp and photoelectricity coupling circuit provide signal.

Alarm lamp and photoelectricity coupling circuit are made up of light-emitting diode 30, photoelectrical coupler the 31, the 7th resistance 32 and the 8th resistance 16.Luminous tube in the photoelectrical coupler 31 is anodal to be connected with the high potential output of voltage comparator circuit 29; Luminous tube negative pole in the photoelectrical coupler 31 is connected with the positive pole of light-emitting diode 30; Light-emitting diode 30 negative poles are connected with the electronegative potential output of voltage comparator circuit 29; One end of the 8th resistance 16 in the phototriode collector electrode in the photoelectrical coupler 31 and the drive circuit 34 is connected; The other end of the 8th resistance 16 is connected with the cathode output end of rectification circuit 12 in the drive circuit 34; Phototriode emitters in the photoelectrical coupler 31 are connected with an end of the 7th resistance 32, and the cathode output end of the rectification circuit 12 in the other end of the 7th resistance 32 and the drive circuit 34 is connected, and the trigger electrode of the controllable silicon 13 in the tie point of the interior phototriode emitter of photoelectrical coupler 31 and the 7th resistance 32 and the drive circuit 34 is connected.

Drive circuit 34 is made up of rectification circuit 12, controllable silicon 13, diode 17, amplifying circuit 14 and the 8th resistance 16.The phase line 8 and the zero line 9 of load end pass zero sequence current mutual inductor 15, and as the elementary winding of zero sequence current mutual inductor 15, the secondary winding of zero sequence current mutual inductor 15 is connected with the signal input part of amplifying circuit 14.The phase line 8 of load end is connected with an end of solenoid 11, and the other end of solenoid 11 is connected with one of them input of rectification circuit 12, and another input of rectification circuit 12 is connected with load end zero line 9.The cathode output end of rectification circuit 12 is connected with the anode of controllable silicon 13, and the cathode output end of rectification circuit 12 is connected with the negative electrode of controllable silicon 13.The cathode output end of rectification circuit 12 is connected with an end of the 8th resistance 16; The other end of the 8th resistance 16 is connected with photoelectrical coupler 31 interior phototriode collector electrodes with the positive source of amplifying circuit 14; One end of the power cathode of the cathode output end of rectification circuit 12 and amplifying circuit 14 and the 7th resistance 32 of ground wire electrified detection circuit 33 is connected, rectification circuit 12 through the 8th resistance 16 respectively to amplifying circuit 14 and photoelectrical coupler 31 power supplies.

Photoelectrical coupler 31 with also have another kind of equivalent connected mode being connected of controllable silicon 13, referring to shown in Figure 3.Phototriode emitter in the photoelectrical coupler 31 and the tie point of the 7th resistance 32 also can be connected with the signal input part of amplifying circuit 14 in the drive circuit 34, and the signal output part of amplifying circuit 14 directly is connected with the trigger electrode of controllable silicon 13.

In the use, the push rod that resets of leakage protecting plug is pressed, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1 and ground wire contact 3 and 4 are connected, and the phase line 8 of load end, zero line 9, ground wire 10 are connected with phase line 6, zero line 5, the ground wire 7 of power end respectively.The zero line 5 of power end is zero with the voltage of ground wire 7 during normal condition, has only phase line 6 charged.Phase line 6 provides power supply with zero line 5 for the rectification decompression voltage regulator 23 in the ground wire electrified detection circuit 33, and rectifying and voltage-stabilizing reduction voltage circuit 23 provides power supply and reference voltage for voltage comparator circuit 29.The 2nd diode 25 in the voltage comparator circuit 29 is connected with ground wire 7, and voltage comparator circuit 29 is through making judgement to the voltage of ground wire 7 and the contrast of reference voltage, output low level or high level.

When the voltage of ground wire 7 and 10 is zero, or with voltage and do not reach when setting threshold values (like 24V), and the output of amplifying circuit 28 still keeps low level; Be connected the light-emitting diode 30 and photoelectrical coupler 31 not conductings (being that alarm lamp does not work) of 29 liang of outputs of voltage comparator circuit, the phototriode in the photoelectrical coupler 31 does not have conducting yet, and controllable silicon 13 is not received triggering signal; Keep cut-off state; Drive circuit 34 does not drive tripping coil 11, phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1; Ground wire contact 3 and 4 still remains closed.

Non-vanishing and institute is with voltage when setting threshold values (like 24V) when the voltage of ground wire 7 and 10; Or ground wire virtual connection and when causing no ground connection, the output of amplifying circuit 28 then transfers high level to, the light-emitting diode 30 that is connected 29 liang of outputs of voltage comparator circuit (is that alarm lamp is lighted with photoelectrical coupler 31 conductings; Prompting user ground wire electrification); The phototriode of photoelectrical coupler 31 is conducting immediately also, and triggering signal is delivered to the trigger electrode of controllable silicon 13, makes it become conducting state by cut-off state; Drive circuit 34 drives solenoid 11 actions, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4 will break off immediately.

When the phase line 8 of load end, consuming device on the zero line 9 break down electric leakage when causing ground wire 7 and 10 unexpected charged whiles all to take place with the ground protection system exception; Owing to residual current occurs through zero sequence current mutual inductor 15; Amplifying circuit 14 in the drive circuit 34 can induced signal processing and amplifying from zero sequence current mutual inductor 15 after, deliver to through diode 17 on the trigger electrode of controllable silicon 13; Simultaneously, also be added on the trigger electrode of controllable silicon 13 from the triggering signal of ground wire electrified detection circuit 33.As long as one of them signal arrives first; Or two signal arrive the trigger electrode of controllable silicon 13 simultaneously; Can both make controllable silicon 13 conductings, drive circuit 34 drives solenoid 11 actions, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4 will break off immediately.

When the zero utmost point of power supply power supply base connects instead with the utmost point mutually, promptly during by reversal connection, zero line 5 is charged with phase line 6 for the zero line 5 of power end, and phase line 6 is a no-voltage with ground wire 7.Rectification decompression voltage regulator 23 in the ground wire electrified detection circuit 33 is in the negative half period work of the sinusoidal alternating current of power end; The voltage of ground wire 7 is higher than the reference voltage of voltage comparator circuit 29 at this moment; Then amplifying circuit 28 outputs are high level; Be connected the light-emitting diode 30 and photoelectrical coupler 31 conductings (be that alarm lamp is lighted, prompting user power end zero connects instead mutually), the phototriode conducting immediately in the photoelectrical coupler 31 of 29 liang of outputs of voltage comparator circuit; Triggering signal is delivered to the trigger electrode of controllable silicon 13; Make it become conducting state by cut-off state, drive circuit 34 drives solenoid 11 actions, and phase line contact 2-2 and 1-2, zero line contact 2-1 and 1-1, ground wire contact 3 and 4 will break off immediately.

Claims

1. band warning device leakage protecting plug; Comprise zero sequence current mutual inductor (15), test loop, electromagnetic trip and locker that shell and latch, phase line (6), zero line (5), ground wire (7), phase line (6) and zero line (5) all pass; This electromagnetic trip and locker comprise solenoid (11) and drive circuit (34), contact, spring, push rod resets; The drive circuit (34) of said solenoid (11) mainly is made up of rectification circuit (12), controllable silicon (13); It is characterized in that: between phase line (6), zero line (5) and the ground wire (7) of described power end, be connected with ground wire electrified detection circuit (33); This ground wire electrified detection circuit (33) is made up of rectification decompression voltage regulator (23), voltage comparator circuit (29), alarm lamp and photoelectricity coupling circuit; The power end of photoelectricity coupling circuit is connected with rectification circuit (12) output, and the output of photoelectricity coupling circuit is connected with the trigger electrode of controllable silicon (13).

2. band warning device leakage protecting plug according to claim 1; It is characterized in that: the rectification decompression voltage regulator (23) in the said ground wire electrified detection circuit (33) is made up of the 1st diode (18), the 1st resistance (19), the 2nd resistance (20), voltage stabilizing didoe (21) and the 1st electric capacity (22); Said the 1st diode (18) is a rectifier cell; Its positive pole is connected with power end phase line (6); Its negative pole is connected with an end of the 1st resistance (19); The other end of the 1st resistance (19) is connected with an end of the 2nd resistance (20), the negative pole of voltage stabilizing didoe (21), the positive pole of the 1st electric capacity (22); The negative pole anodal and the 1st electric capacity (19) of the other end of said the 2nd resistance (20), voltage stabilizing didoe (21) is connected with the zero line (5) of power end, the output head anode of the just very rectification decompression voltage regulator of the 1st electric capacity (22), and the negative pole of the 1st electric capacity (22) is the negative pole of output end of rectification decompression voltage regulator.

3. band warning device leakage protecting plug according to claim 1; It is characterized in that: the rectification decompression voltage regulator (23) of said ground wire electrified detection circuit (33) is made up of the 1st diode (18), the 3rd resistance (35), voltage stabilizing didoe (21), the 2nd electric capacity (36) and the 1st electric capacity (22); The 1st diode (18) is a rectifier cell; Its positive pole is connected with power end phase line (6); Its negative pole is connected with an end of the 3rd resistance (35); The 3rd resistance (35) is parallelly connected with the 2nd electric capacity (36), and the other end of the 3rd resistance (35) is connected with the negative pole of voltage stabilizing didoe (21) and the positive pole of the 1st electric capacity (22), and the negative pole of the positive pole of voltage stabilizing didoe (21), the 1st electric capacity (22) is connected with the zero line (5) of power end; The output head anode of the just very rectification decompression voltage regulator of the 1st electric capacity (22), the negative pole of the 1st electric capacity (22) is the negative pole of output end of rectification decompression voltage regulator.

4. band warning device leakage protecting plug according to claim 1; It is characterized in that: the voltage comparator circuit (29) of said ground wire electrified detection circuit (33) is made up of with amplifying circuit (28) the 4th resistance (24), the 5th resistance (26), the 6th resistance (27), the 2nd diode (25); Be connected with the 4th resistance (24) between the positive source of amplifying circuit (28) and its signal electrode input end; The signal negative input of amplifying circuit (28) is connected with an end of the 5th resistance (26); The other end of the 5th resistance (26) is connected with the negative pole of the 2nd diode (25); The positive pole of the 2nd diode (25) is connected with the ground wire (7) of power end; The positive source of amplifying circuit (28) is connected with the output head anode of rectification decompression voltage regulator (23), and the power cathode of amplifying circuit (28) is connected with the negative pole of output end of rectification decompression voltage regulator (23), and the positive source of amplifying circuit (28) is connected with an end of the 6th resistance (27); The other end of the 6th resistance (27) is the high potential output of voltage comparator circuit (29), and the output of amplifying circuit (28) is the electronegative potential output of voltage comparator circuit (29).

5. band warning device leakage protecting plug according to claim 1; It is characterized in that: the voltage comparator circuit (29) of described ground wire electrified detection circuit (33) is made up of with amplifying circuit (28) the 4th resistance (24), the 5th resistance (26), the 6th resistance (27), the 2nd diode (25); Be connected with the 4th resistance (24) between the power cathode of amplifying circuit (28) and its signal negative input; The signal electrode input end of amplifying circuit (28) is connected with an end of the 5th resistance (26); The other end of the 5th resistance (26) is connected with the negative pole of the 2nd diode (25); The positive pole of the 2nd diode (25) is connected with the ground wire (7) of power end; The positive source of amplifying circuit (28) is connected with the output head anode of rectification decompression voltage regulator (23), and the power cathode of amplifying circuit (28) is connected with the negative pole of output end of rectification decompression voltage regulator (23), and the power cathode of amplifying circuit (28) is connected with an end of the 6th resistance (27); The other end of the 6th resistance (27) is the electronegative potential output of voltage comparator circuit (29), and the output of amplifying circuit (28) is the high potential output of voltage comparator circuit (29).

6. band warning device leakage protecting plug according to claim 1; It is characterized in that: alarm lamp and photoelectricity coupling circuit are made up of light-emitting diode (30), photoelectrical coupler (31), the 7th resistance (32) and the 8th resistance (16); Luminous tube in the photoelectrical coupler (31) is anodal to be connected with the high potential output of voltage comparator circuit (29); Luminous tube negative pole in the photoelectrical coupler (31) is connected with the positive pole of light-emitting diode (30); Light-emitting diode (30) negative pole is connected with the electronegative potential output of voltage comparator circuit (29); Phototriode collector electrode in the photoelectrical coupler (31) is connected with an end of the 8th resistance (16); The other end of the 8th resistance (16) is connected with rectification circuit (12) cathode output end in the drive circuit (34); Phototriode emitter in the photoelectrical coupler (31) is connected with an end of the 7th resistance (32), and the cathode output end of the rectification circuit (12) in the other end of the 7th resistance (32) and the drive circuit (34) is connected, and the interior phototriode emitter of photoelectrical coupler (31) is connected with controllable silicon (13) trigger electrode of drive circuit (34) with the tie point of the 7th resistance (32).