CN102324718A

CN102324718A - Power leakage protector

Info

Publication number: CN102324718A
Application number: CN201110292759A
Authority: CN
Inventors: 刘睿刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-10-05
Filing date: 2011-10-05
Publication date: 2012-01-18
Anticipated expiration: 2031-10-05
Also published as: CN102324718B

Abstract

The invention discloses a power leakage protector which not only can protect electric shock accidents caused by faults of electric appliances, but also can prevent electric shock accidents caused by accidental electrification of an earth wire. The power leakage protector is further provided with a weak current detection sensor, a primary winding and a secondary winding of the weak current detection sensor are wound on an iron core of the weak current detection sensor, a detection circuit formed by connecting the primary winding with a current-limiting resistance-capacitance element in series is connected between the earth wire and a zero wire, one output end and another output end of the secondary winding of the weak current detection sensor are respectively connected with one input end and another input end of a second group of input ends in a driving circuit of an electromagnetic coil, one wire end and another wire end of the electromagnetic coil, and the anode and cathode of a first silicon controlled thyristor, and the anode and the cathode of a second silicon controlled thyristor are respectively connected in parallel with the anode and a public electrode on an output end of a rectification circuit.

Description

A kind of earth leakage protective device

Technical field

The present invention relates to Electrical Safety resist technology field, especially relate to a kind of earth leakage protective device.

Background technology

Chinese patent document publication number is that CN1142618C discloses the earth leakage protective device 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 earth leakage protective device, 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; When occurring residual current between phase, the zero line and reaching the threshold values that presets (for example: 10mA); It will be threaded off immediately, cuts off phase line, zero line and ground wire; 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.

By on can know; Existing earth leakage protective device is exactly must have between load end phase, the zero line to have a mind on residual current or the load end ground wire that extrinsic current flows through and working power must normally could be threaded off in the unexpected precondition that can thread off when charged of the electric leakage of load end fault or ground wire, otherwise can not realize protecting.So just there is following defective in existing earth leakage protective device: 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) and the electric leakage of earth leakage protective device 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 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, existing earth leakage protective device 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 through human body or livestock, earth leakage protective device is threaded off and phase line, zero line, ground wire disconnection, though it can in time be threaded off and protect the life security of people or livestock in 0.1S thereby produce residual current or the unexpected electric current of ground wire; But existing earth leakage protective device 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; (for example: when the power end phase line or zero line is unexpected breaks off take place when unusual when power end simultaneously; Or power end phase line and ground wire reversal connection); At this moment the solenoid of the electromagnetic trip in the earth leakage protective device of prior art and locker owing to not electric and can not produce electromagnetic force; So earth leakage protective device can not be threaded off, still can keep phase line contact, zero line contact and ground wire contact to be in on-state, in case at this moment ground wire meets accident charged (for example: phase line and ground wire reversal connection) or the phase line electric leakage; Earth leakage protective device can not break off phase line contact, zero line contact and ground wire contact owing to can not thread off.

In sum, existing earth leakage protective device still can cause the generation of electric shock casualty accident.

Summary of the invention

The object of the present invention is to provide a kind of earth leakage protective device that can overcome above-mentioned existing earth leakage protective device 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 earth leakage protective device load end consuming device occur and causes on the electric appliance casing band dangerous voltage or the ground protection 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 reaching ground wire to phase, zero breaks off; And it (for example: when power end phase line or the unexpected disconnection of zero line can also take place unusually at power end; Or power end phase line and ground wire reversal connection) time automatically mutually, zero and ground wire break off entirely, thereby guaranteed people's Electrical Safety.

Technical solution proposed by the invention is such:

A kind of earth leakage protective device; Comprise zero sequence current mutual inductor, test loop, electromagnetic trip and locker that shell, phase line, zero line, ground wire, phase line and zero line all pass; This electromagnetic trip and locker comprise solenoid and drive circuit thereof, contact, spring, reset key; The drive circuit of said solenoid mainly is made up of rectification circuit, the 1st controllable silicon, the 2nd controllable silicon; The drive circuit input of said solenoid is provided with the 1st group of input and the 2nd group of input; Said zero sequence current mutual inductor secondary winding one output and another output respectively with the drive circuit of said solenoid in an input of the 1st group of input be connected with another input; 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 detects the inductor secondary winding all on said weak current detection inductor iron core; 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; Said weak current detect inductor secondary winding one output and another output respectively with the drive circuit of said solenoid in an input of the 2nd group of input be connected with another input, said solenoid one line end and another line end, the 1st controllable silicon anode and negative electrode, the 2nd controllable silicon anode and negative electrode are connected in parallel with said rectification circuit output end positive pole and public pole respectively.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 1st amplifying circuit, the 2nd controllable silicon and the 2nd amplifying circuit; An input of the 1st group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively said the 2nd amplifying circuit one input and another input in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 1st controllable silicon trigger electrode; The 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with another input with said the 2nd amplifying circuit one input respectively with another output; Said the 2nd amplifying circuit triggers output and is connected with said the 2nd controllable silicon trigger electrode, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 1st amplifying circuit and the 2nd controllable silicon; An input of the 1st group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively the 2nd controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 1st controllable silicon trigger electrode; The 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with negative electrode with the 2nd controllable silicon trigger electrode respectively with another output, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 1st amplifying circuit, the 2nd controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode and stabilized voltage power supply; An input of the 1st group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively the 2nd controllable silicon trigger electrode and the 1st clamp diode positive pole in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 1st controllable silicon trigger electrode; The 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Between said rectification circuit output end positive pole and public 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; 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 public 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; The stabilized voltage power supply other end is connected with said rectification circuit output end public pole; 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 public pole with said rectification circuit output end is anodal respectively with negative electrode.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 2nd controllable silicon and the 1st amplifying circuit; An input of the 1st group of input and another input are respectively said the 1st controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with negative electrode with said the 1st controllable silicon trigger electrode respectively with another output; The 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 2nd controllable silicon trigger electrode, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

When the drive circuit of said solenoid by rectification circuit, the 1st controllable silicon, when the 2nd controllable silicon is formed; An input of the 1st group of input and another input are respectively said the 1st controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively said the 2nd controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with negative electrode with said the 1st controllable silicon trigger electrode respectively with another output; The 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with negative electrode with the 2nd controllable silicon trigger electrode respectively with another output, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 2nd controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode and voltage stabilizing didoe; An input of the 1st group of input and another input are respectively said the 1st controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively said the 2nd controllable silicon trigger electrode and said the 1st clamp diode positive pole in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with negative electrode with said the 1st controllable silicon trigger electrode respectively with another output, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Between said rectification circuit output end positive pole and public 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; 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 public pole; Said the 1st resistance other end also is connected with the voltage stabilizing didoe negative pole respectively with the 2nd resistance one end, and voltage stabilizing didoe is anodal to be connected with said rectification circuit output end public pole, and 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 public pole with said rectification circuit output end is anodal respectively with negative electrode.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode, stabilized voltage power supply, the 2nd controllable silicon and the 1st amplifying circuit; An input of the 1st group of input and another input are respectively the 1st controllable silicon trigger electrode and said the 1st clamp diode positive pole in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid; Between said rectification circuit output end positive pole and public 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; 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 public pole; 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 public pole, and said zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode; Its another output is connected with said the 1st clamp diode is anodal, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 2nd controllable silicon trigger electrode, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

When the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode, voltage stabilizing didoe and the 2nd controllable silicon; An input of the 1st group of input and another input are respectively the 1st controllable silicon trigger electrode and said the 1st clamp diode positive pole in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively said the 2nd controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; Between said rectification circuit output end positive pole and public 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; 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 public pole; Said the 1st resistance other end also is connected with the voltage stabilizing didoe negative pole respectively with the 2nd resistance one end, and voltage stabilizing didoe is anodal to be connected with said rectification circuit output end public pole, and said zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode; Its another output is connected with said the 1st clamp diode is anodal, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with negative electrode with said the 2nd controllable silicon trigger electrode respectively with another output, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

When the drive circuit of said solenoid by rectification circuit, the 1st controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode, voltage stabilizing didoe, the 2nd controllable silicon, the 3rd resistance, when the 2nd clamp diode is formed; An input of the 1st group of input and another input are respectively the 1st controllable silicon trigger electrode and said the 1st clamp diode positive pole in the drive circuit of said solenoid; An input of the 2nd group of input and another input are respectively the 2nd controllable silicon trigger electrode and said the 2nd clamp diode positive pole in the drive circuit of said solenoid; Between said rectification circuit output end positive pole and public 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; 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 public pole; Said the 1st resistance other end also is connected with the voltage stabilizing didoe negative pole respectively with the 2nd resistance one end, and voltage stabilizing didoe is anodal to be connected with said rectification circuit output end public pole, and the 3rd resistance one end is connected with said voltage stabilizing didoe negative pole; 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 voltage stabilizing didoe is anodal; Said zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode; Its another output is connected with said the 1st clamp diode is anodal; The 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; 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 2nd clamp diode is anodal, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

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.

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

When the drive circuit of said solenoid was made up of rectification circuit, the 1st controllable silicon, the 1st amplifying circuit, the 2nd controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode and stabilized voltage power supply, said stabilized voltage power supply one end and the said stabilized voltage power supply other end can be respectively the power end and ground end of said the 1st amplifying circuit.

When the drive circuit of said solenoid was made up of rectification circuit, the 1st controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode, stabilized voltage power supply, the 2nd controllable silicon and the 1st amplifying circuit, said stabilized voltage power supply one end and the said stabilized voltage power supply other end can be respectively the power end and ground end of said the 1st amplifying circuit.

Substantive features of the present invention be except the same with existing earth leakage protective device 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 earth leakage protective device 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 zero 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, the ground protection system exception is with dangerous voltage or when the electric leakage of ground protection system earth disappearance and consuming device causes on exposed metal parts and the ground tape dangerous voltage; It can detect, respond to the output signal automatically and earth leakage protective device 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; And it also is to take place when unusual when power supply; It also can move phase line, zero line, the whole automatic disconnections of ground wire immediately; Thereby guarantee only under the normal situation of whole protecting system, could to use, solved existing earth leakage protective device and akinesia when unusual has taken place, can not provide and protect and the problem of initiation electric shock accidents at power supply.

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

(1), earth leakage protective device of the present invention 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; During use; In case when electric leakage of the consuming device fault on earth leakage protective device load end phase, the zero line and ground protection system ground wire disappearance (for example: the virtual connection of socket ground wire causes no ground connection); Metal parts that consuming device exposes and earth leakage protective device ground wire all can be with dangerous voltage; Weak current detects inductor will detect, responds to and export signal; Earth leakage protective device, human body or livestock just can in time be broken off phase line, zero line and ground wire before touching consuming device entirely; It in this case must human body than existing earth leakage protective device or livestock touch and flow through could thread off after the residual current better security protection is provided, so it is more safer than existing earth leakage protective device.

(2), earth leakage protective device of the present invention 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; During use; When in case the ground protection system exception causes the ground wire accident to be with dangerous voltage; Weak current detects inductor will detect, responds to and export signal; Earth leakage protective device, human body or livestock just can in time be broken off phase line, zero line and ground wire before touching electrical equipment entirely; It in this case must human body than existing earth leakage protective device or livestock touch and flow through could thread off after the unexpected electric current of ground wire better security protection is provided, so it is more safer than existing earth leakage protective device.

(3), earth leakage protective device of the present invention 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 does not have the restriction of minimum starting voltage; So it to ground wire with voltage height unrestricted; Reach the threshold values (for example: 10 microamperes) that presets as long as flow through the electric current of the elementary winding of weak current detection inductor; Earth leakage protective device of the present invention will be threaded off; Therefore it not only ground wire (or consuming device exposed metal parts) with the dangerous voltage height can thread off during to 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; But when ground wire with voltage when being lower than predetermined 36V safe voltage, it just need not threaded off to avoid misoperation.It is thus clear that the voltage range that it can shield is wide, so earth leakage protective device of the present invention is not only handy, and safety and reliability.

(4), earth leakage protective device of the present invention 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), earth leakage protective device of the present invention 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, thus safer and reliable.

(6), earth leakage protective device of the present invention 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), earth leakage protective device of the present invention needs getting under the electric situation and could connect its phase line contact, zero line contact, ground wire contact; When unusual (for example: zero-power line breaks off) takes place in power supply; Earth leakage protective device of the present invention can not reset; Can not connect its phase line contact, zero line contact, ground wire contact, thereby guaranteed that earth leakage protective device of the present invention only could use under the normal situation of whole protecting system.

(8), earth leakage protective device of the present invention in use; Unusual when the power supply generation, for example: power supply phase line or zero line are unexpected to be broken off, and it can be threaded off immediately and all break off phase line, zero line and ground wire contact; Solved the akinesia in this case of existing earth leakage protective device; In case generation ground wire accident is charged or the problem of consuming device electric leakage still can initiation electric shock accidents, therefore, earth leakage protective device of the present invention provides the guarantee of a kind of Electrical Safety more completely.

Earth leakage protective device of the present invention is mainly used on the earth leakage protective of various household electrical appliance, can process earth leakage protective device of the present invention the earth leakage protective device product of multiple patterns such as leakage protecting plug, earth leakage protective socket with reference to the electrical principle sketch map of the embodiment of the invention.

Description of drawings

Fig. 1 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 1; Its zero sequence current mutual inductor secondary winding one output is connected with another input with the 1st amplifying circuit one input respectively with another output, and its weak current detects inductor secondary winding one output and is connected with another input with the 2nd amplifying circuit one input respectively with another output.

Fig. 2 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 2; Its zero sequence current mutual inductor secondary winding one output is connected with another input with the 1st amplifying circuit one input respectively with another output, and its weak current detects inductor secondary winding one output and is connected with negative electrode with the 2nd controllable silicon trigger electrode respectively with another output.

Fig. 3 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 3; Its zero sequence current mutual inductor secondary winding one output is connected with another input with the 1st amplifying circuit one input respectively with another output; Its weak current detects inductor secondary winding one output and is connected with the 2nd controllable silicon trigger electrode and the 1st clamp diode are anodal respectively with another output, adopts the voltage stabilizing didoe voltage stabilizing.

Fig. 4 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 4; Its zero sequence current mutual inductor secondary winding one output is connected with another input with the 1st amplifying circuit one input respectively with another output; Its weak current detects inductor secondary winding one output and is connected with the 1st clamp diode positive pole with the 2nd controllable silicon trigger electrode respectively with another output, utilize the 1st amplifying circuit power end and bring in voltage stabilizing.

Fig. 5 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 5; Its zero sequence current mutual inductor secondary winding one output is connected with negative electrode with the 1st controllable silicon trigger electrode respectively with another output, and its weak current detects inductor secondary winding one output and is connected with another input with the 1st amplifying circuit one input respectively with another output.

Fig. 6 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 6; Its zero sequence current mutual inductor secondary winding one output is connected with negative electrode with the 1st controllable silicon trigger electrode respectively with another output, and its weak current detects inductor secondary winding one output and is connected with negative electrode with the 2nd controllable silicon trigger electrode respectively with another output.

Fig. 7 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 7; Its zero sequence current mutual inductor secondary winding one output is connected with negative electrode with the 1st controllable silicon trigger electrode respectively with another output, and its weak current detects inductor secondary winding one output and is connected with the 2nd controllable silicon trigger electrode and the 1st clamp diode are anodal respectively with another output.

Fig. 8 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 8; Its zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode and the 1st clamp diode are anodal respectively with another output; Its weak current detects inductor secondary winding one output and is connected with another input with the 1st amplifying circuit one input respectively with another output, adopts the voltage stabilizing didoe voltage stabilizing.

Fig. 9 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 9; Its zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode and the 1st clamp diode are anodal respectively with another output; Its weak current detects inductor secondary winding one output and is connected with another input with the 1st amplifying circuit one input respectively with another output, utilize the 1st amplifying circuit power end and bring in voltage stabilizing.

Figure 10 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 10; Its zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode and the 1st clamp diode are anodal respectively with another output, and its weak current detects inductor secondary winding one output and is connected with negative electrode with the 2nd controllable silicon trigger electrode respectively with another output.

Figure 11 is the earth leakage protective device electrical principle sketch map of the embodiment of the invention 11; Its zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode and the 1st clamp diode are anodal respectively with another output, and its weak current detects inductor secondary winding one output and is connected with the 2nd controllable silicon trigger electrode and the 2nd clamp diode are anodal respectively with another output.

Embodiment

Through following embodiment the present invention is done further to set forth in detail.

Embodiment 1

Referring to shown in Figure 1, a kind of earth leakage protective device mainly detects inductor the 18, the 1st amplifying circuit the 19, the 2nd amplifying circuit 24, electromagnetic trip and locker by the phase line 5 of shell, power end, zero line 6, ground wire 7, load end phase line 8, zero line 9, ground wire 10, rectification circuit the 12, the 1st controllable silicon the 13, the 2nd controllable silicon 14, zero sequence current mutual inductor 15, test loop 16, current limliting Resistor-Capacitor Unit 17, weak current and forms.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, reset key.

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 1st amplifying circuit the 19, the 2nd controllable silicon the 14, the 2nd amplifying circuit 24; Zero sequence current mutual inductor 15 secondary winding one output is connected with another input with the 1st amplifying circuit 19 1 inputs respectively with another output; The 1st amplifying circuit 19 triggers output and is connected with the 1st controllable silicon 13 trigger electrodes, and the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; Be connected between the ground wire 7 and zero line 6 of power end after weak current detects inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current detects inductor 18 secondary winding one output and is connected with another input with the 2nd amplifying circuit 24 1 inputs respectively with another output; The 2nd amplifying circuit 24 triggers output and is connected with the 2nd controllable silicon 14 trigger electrodes; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; Solenoid 11 1 line ends are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with another line end; Be connected with power end phase line 5 behind the rectification circuit 12 1 inputs series connection dropping resistor, its another input is connected with power end zero line 6.

Rectification circuit 12 adopts half-wave rectifying circuit in this example, also can adopt bridge rectifier.

In the present embodiment, current limliting Resistor-Capacitor Unit 17 is a resistance, also can adopt electric capacity or resistance and capacitance component.

In the present embodiment; The iron core that weak current detects inductor 18 adopts the permalloy material to process; Also can adopt amorphous alloy or ultramicro-crystal alloy 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.

When the earth leakage protective device power end when initially not powering on; Power end phase line 5, zero line 6 do not have; The solenoid 11 that is connected between power end phase line 5, the zero line 6 does not have electricity can not produce electromagnetic force; Electromagnetic trip and locker can not snap closes, and leakage protecting plug can't reset, and phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 all are in off-state.

During use; When the earth leakage protective device power end is applied the operate as normal power supply; Power end phase line 5, zero line 6; Solenoid 11 energisings that are connected between power end phase line 5, the zero line 6 produce electromagnetic attraction and electromagnetic trip and locker are got ready for the energising that resets; When pressing with the handgrip reset key; Electromagnetic trip and the locker electromagnetic attraction through solenoid 11 is snap close and impel phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 is all closed connects immediately, all connects power end phase line 5 and load end phase line 8, power end zero line 6 with load end ground wire 10 with load end zero line 9, power end ground wire 7, ground wire 7 with 10 because the effects of ground connection are clamped at about zero lying prostrate voltage;

Zero line

6 and 9 also is about zero volt simultaneously; Be connected the electric current that weak current between earth leakage protective device power end ground wire 7 and the zero line 6 detects inductor 18 elementary windings and just do not have electric current to flow through or flow through like this and do not reach the threshold values (for example: 10 microamperes) that presets, this moment, earth leakage protective device just remained on the "on" position that resets, thereby for the consuming device power supply of its lower end with ground connection is provided.

During use; The electric leakage and if the consuming device on the phase line of load end 8, the zero line 9 breaks down 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 the 1st amplifying circuit 19; And when residual current reaches predefined threshold values (for example: 10 milliamperes); The 1st controllable silicon 13 is by the 1st amplifying circuit 19 triggering and conducting, and the solenoid 11 on electromagnetic trip and the locker is caused by bypass not to be had electromagnetic attraction and earth leakage protective device is threaded 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; The electric leakage and when not having ground connection (for example: the ground wire virtual connection causes no ground connection on the socket) if the consuming device on the phase line of load end 8, the zero line 9 breaks down in the ground protection system; Metal parts that consuming device exposes and earth leakage protective device ground wire 10 and 7 all can be with dangerous voltage; Being connected weak current between earth leakage protective device 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 to the 2nd amplifying circuit 24; And when weak current reaches predefined threshold values (for example: 10 microamperes); The 2nd controllable silicon 14 is by the 2nd amplifying circuit 24 triggering and conducting; Solenoid 11 on electromagnetic trip and the locker is caused by bypass not to be had electromagnetic attraction and earth leakage protective device is threaded 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 has ensured people's 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 signal of inductor 18 secondary winding output and gives the 2nd amplifying circuit 24; And when weak current reached predefined threshold values (for example: 10 microamperes), the 2nd controllable silicon 14 was by the 2nd amplifying circuit 24 triggering and conducting, and the solenoid 11 on electromagnetic trip and the locker is caused by bypass not to be had electromagnetic attraction and earth leakage protective device is threaded off; Touch people and 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 before the consuming device, thereby ensured people's 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 the 1st amplifying circuit 19; And when reaching the threshold values that presets; Trigger 13 conductings of the 1st controllable silicon, likewise, weak current detects inductor 18 secondary winding also can export a signal to the 2nd amplifying circuit 24; And when reaching the threshold values that presets; The 2nd amplifying circuit 24 triggers 14 conductings of outputs output signal triggering the 2nd controllable silicon, as long as the solenoid 11 that is connected in parallel with them is caused by bypass do not have electromagnetic attraction and make the earth leakage protective device dropout with regard to having reached the 1st controllable silicon 13 that is connected in parallel and any conducting that is triggered among the 2nd controllable silicon 14 like this, thereby has protected people's safety better.

During use; Power supply is in case take place unusual; For example phase line on the power supply lines 5 or zero line 6 unexpected disconnections; At this moment rectification circuit 12 outputs in the earth leakage protective device do not have operating current output; Solenoid 11 in electromagnetic trip and the locker does not have electromagnetic attraction that electromagnetic trip and locker are threaded off automatically owing to dead electricity causes, all break off earth leakage protective device phase line contact 1-1 and 2-1 and zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 automatically immediately, thereby ensured the safety of people's electricity consumptions better.

Embodiment 2

Referring to shown in Figure 2; Compare with embodiment 1; Present embodiment has been cancelled embodiment 1 described the 2nd amplifying circuit 24 in the drive circuit of solenoid; And detecting inductor 18 secondary winding one output to weak current is connected with negative electrode with the 2nd controllable silicon 14 trigger electrodes of present embodiment by being connected with another input to change to respectively with embodiment 1 described the 2nd amplifying circuit 24 1 inputs respectively with another output; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; The signal that makes weak current detect the output of inductor 18 secondary winding directly triggers the 2nd controllable silicon 14, and the signal that detects the output of inductor 18 secondary winding owing to said weak current is enough big, just can not trigger the 2nd controllable silicon 14 so need not amplify.

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.

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 1st amplifying circuit the 19, the 2nd controllable silicon 14; Zero sequence current mutual inductor 15 secondary winding one output is connected with another input with the 1st amplifying circuit 19 1 inputs respectively with another output; The 1st amplifying circuit 19 triggers output and is connected with the 1st controllable silicon 13 trigger electrodes; The 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current is connected between the ground wire 10 and zero line 9 of load end; Weak current detects inductor 18 secondary winding one output and is connected with negative electrode with the 2nd controllable silicon 14 trigger electrodes respectively with another output, and the 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode.

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.

Because the remaining circuit structure of present embodiment earth leakage protective device is all identical with embodiment 1 with composition, only be the control mode difference that triggers the 2nd controllable silicon 14, therefore, do not give unnecessary details at this.

Embodiment 3

Referring to shown in Figure 3; Compare with embodiment 2; Present embodiment has increased the 1st clamp diode 22 anodal clamp circuits of being made up of the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22, voltage stabilizing didoe 23 in the drive circuit of solenoid; Between rectification circuit 12 output head anodes (+) and public pole (com), be connected with the loop that is in series by the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22; The 1st resistance 20 1 ends are connected with rectification circuit 12 output head anodes (+); The 1st resistance 20 other ends are connected with the 2nd resistance 21 1 ends, the 2nd resistance 21 other ends and 22 anodal connections of the 1st clamp diode, and the 1st clamp diode 22 negative poles are connected with rectification circuit 12 output public poles (com); The 1st resistance 20 other ends, the 2nd resistance 21 1 ends are connected with voltage stabilizing didoe 23 negative poles respectively, and voltage stabilizing didoe 23 positive poles are connected with rectification circuit 12 output public poles (com).

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 1st amplifying circuit the 19, the 2nd controllable silicon the 14, the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22, voltage stabilizing didoe 23; Zero sequence current mutual inductor 15 secondary winding one output is connected with another input with the 1st amplifying circuit 19 1 inputs respectively with another output; The 1st amplifying circuit 19 triggers output and is connected with the 1st controllable silicon 13 trigger electrodes, and the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current 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 14 trigger electrodes and the 1st clamp diode 22 positive poles respectively with another output; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; The signal that makes weak current detect the output of inductor 18 secondary winding is superimposed upon on the basis of the 1st clamp diode 22 conduction voltage drops and triggers the 2nd controllable silicon 14, thereby has reduced the requirement that weak current is detected inductor 18 secondary winding output voltages.

In the present embodiment; The iron core that weak current detects inductor 18 adopts amorphous alloy to process; Also can adopt the ultramicro-crystal alloy material to process or the permalloy material is processed; 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 earth leakage protective device is all identical with embodiment 2 with composition, only be the control mode difference that triggers the 2nd controllable silicon 14, therefore, do not give unnecessary details at this.

Embodiment 4

Referring to shown in Figure 4, to compare with embodiment 3, present embodiment has been cancelled embodiment 3 described voltage stabilizing didoes 23.

In the present embodiment; Be connected with the loop that is in series by the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22 between rectification circuit 12 output head anodes (+) and the public pole (com); The 1st resistance 20 1 ends are connected with rectification circuit 12 output head anodes (+); The 1st resistance 20 other ends are connected with the 2nd resistance 21 1 ends; The 2nd resistance 21 other ends and the 1st clamp diode 22 are anodal to be connected, and the 1st clamp diode 22 negative poles are connected with rectification circuit 12 output public poles (com), the 1st resistance 20 other ends, the 2nd resistance 21 1 ends respectively with the power end of the 1st amplifying circuit 19 (+VS) be connected; The ground end (GND) of the 1st amplifying circuit 19 is connected with rectification circuit 12 output public poles (com); Present embodiment is ingenious to have utilized the built-in stabilized voltage power supply 19-1 of the 1st amplifying circuit 19, has reduced part, thereby has provided cost savings.

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 1st amplifying circuit the 19, the 2nd controllable silicon the 14, the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22; Zero sequence current mutual inductor 15 secondary winding one output is connected with another input with the 1st amplifying circuit 19 1 inputs respectively with another output; The 1st amplifying circuit 19 triggers output and is connected with the 1st controllable silicon 13 trigger electrodes, and the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current 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 14 trigger electrodes and the 1st clamp diode 22 positive poles respectively with another output; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; The signal that makes weak current detect the output of inductor 18 secondary winding is superimposed upon on the basis of the 1st clamp diode 22 conduction voltage drops and triggers the 2nd controllable silicon 14, thereby has reduced the requirement that weak current is detected inductor 18 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 to process or the permalloy material is processed; 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.

Since the remaining circuit structure of present embodiment earth leakage protective device with form all identically with embodiment 3, only be the voltage regulation way difference in the drive circuit of triggering the 2nd controllable silicon 14, so do not give unnecessary details at this.

Embodiment 5

Referring to shown in Figure 5, a kind of earth leakage protective device mainly detects inductor the 18, the 1st amplifying circuit 19, electromagnetic trip and locker by the phase line 5 of shell, power end, zero line 6, ground wire 7, load end phase line 8, zero line 9, ground wire 10, rectification circuit the 12, the 1st controllable silicon the 13, the 2nd controllable silicon 14, zero sequence current mutual inductor 15, test loop 16, current limliting Resistor-Capacitor Unit 17, weak current and forms.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, reset key.

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 2nd controllable silicon the 14, the 1st amplifying circuit 19; Zero sequence current mutual inductor 15 secondary winding one output is connected with negative electrode with the 1st controllable silicon 13 trigger electrodes respectively with another output, and the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; Be connected between the ground wire 7 and zero line 6 of power end after weak current detects inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current detects inductor 18 secondary winding one output and is connected with another input with the 1st amplifying circuit 19 1 inputs respectively with another output; The 1st amplifying circuit 19 triggers output and is connected with the 2nd controllable silicon 14 trigger electrodes; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; Solenoid 11 1 line ends are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with another line end; Be connected with power end phase line 5 behind the rectification circuit 12 1 inputs series connection dropping resistor, its another input be connected with power end zero line 6.

When the earth leakage protective device power end when initially not powering on; Power end phase line 5, zero line 6 do not have; The solenoid 11 that is connected between power end phase line 5, the zero line 6 does not have electricity can not produce electromagnetic attraction; Electromagnetic trip and locker can not snap closes, and leakage protecting plug can't reset, and phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 all are in off-state.

During use; When the earth leakage protective device power end is applied the operate as normal power supply; Power end phase line 5, zero line 6; Be connected solenoid 11 energising between power end phase line 5, the zero line 6 and produce electromagnetic attractions to make electromagnetic trip and locker be that reset lock is ready, when pressing with the handgrip reset key, the electromagnetic attraction that electromagnetic trip and locker pass through solenoid 11 is snap close immediately; And make phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 is all closed connects; All connect power end phase line 5 and load end phase line 8, power end zero line 6 with load end ground wire 10 with load end zero line 9, power end ground wire 7, after the connection, ground wire 7 and 10 is because the effect of ground connection is clamped at about zero volt voltage; Zero line 6 and 9 also is about zero volt simultaneously; Be connected the electric current that weak current between earth leakage protective device power end ground wire 7 and the zero line 6 detects inductor 18 elementary windings and just do not have electric current to flow through or flow through like this and do not reach the threshold values (for example: 10 microamperes) that presets, this moment, earth leakage protective device just remained on the "on" position that resets, thereby for the consuming device power supply of its lower end with ground connection is provided.

During use; The electric leakage and if the consuming device on the phase line of load end 8, the zero line 9 breaks down 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 the 1st controllable silicon 13; And when residual current reaches predefined threshold values (for example: 10 milliamperes), trigger 13 conductings of the 1st controllable silicon and solenoid 11 on electromagnetic trip and the locker is caused by bypass do not have electromagnetic attraction and earth leakage protective device is threaded 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; The electric leakage and when not having ground connection (for example: the ground wire virtual connection causes no ground connection on the socket) if the consuming device on the phase line of load end 8, the zero line 9 breaks down in the ground protection system; Metal parts that consuming device exposes and earth leakage protective device ground wire 10 and 7 all can be with dangerous voltage; Being connected weak current between earth leakage protective device 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 to the 1st amplifying circuit 14; And when weak current reaches predefined threshold values (for example: 10 microamperes); The 2nd controllable silicon 14 is made solenoid 11 on electromagnetic trip and the locker caused by bypass by the 1st amplifying circuit 19 triggering and conducting not to be had electromagnetic attraction and earth leakage protective device is threaded 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, ensure people's 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 signal of inductor 18 secondary winding output and gives the 1st amplifying circuit 19; And when weak current reaches predefined threshold values (for example: 10 microamperes); The 2nd controllable silicon 14 is made solenoid 11 on electromagnetic trip and the locker caused by bypass by the 1st amplifying circuit 19 triggering and conducting not to be had electromagnetic attraction and earth leakage protective device is threaded off, thereby 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, has ensured people's 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 the 1st controllable silicon 13; And when reaching the threshold values that presets; Trigger 13 conductings of the 1st controllable silicon, likewise, weak current detects inductor 18 secondary winding also can export a signal to the 1st amplifying circuit 19; And when reaching the threshold values that presets; The 1st amplifying circuit 19 triggers 14 conductings of outputs output signal triggering the 2nd controllable silicon, as long as the solenoid 11 that is connected in parallel with them is caused by bypass do not have electromagnetic attraction and make the earth leakage protective device dropout with regard to having reached the 1st controllable silicon 13 that is connected in parallel and any conducting that is triggered among the 2nd controllable silicon 14 like this, thereby has protected people's safety better.

During use; Power supply is in case take place unusual; For example phase line on the power supply lines 5 or zero line 6 unexpected disconnections; At this moment rectification circuit 12 outputs in the earth leakage protective device do not have operating current output; Solenoid 11 in electromagnetic trip and the locker does not have electromagnetic attraction that electromagnetic trip and locker are threaded off automatically owing to dead electricity causes, earth leakage protective device is all broken off phase line contact 1-1 and 2-1 and zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 immediately, thereby has ensured the safety of people's electricity consumptions better.

Embodiment 6

Referring to shown in Figure 6; Compare with embodiment 5; Present embodiment has been cancelled embodiment 5 described the 1st amplifying circuits 19 in the drive circuit of solenoid; And detecting inductor 18 secondary winding one output to weak current is connected with negative electrode with the 2nd controllable silicon 14 trigger electrodes of present embodiment by being connected with another input to change to respectively with embodiment 5 described the 1st amplifying circuit 19 1 inputs respectively with another output; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; The signal that makes weak current detect the output of inductor 18 secondary winding directly triggers the 2nd controllable silicon 14, and the signal that detects the output of inductor 18 secondary winding owing to said weak current is enough big, just can not trigger the 2nd controllable silicon 14 so need not amplify.

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 2nd controllable silicon 14; Zero sequence current mutual inductor 15 secondary winding one output is connected with negative electrode with the 1st controllable silicon 13 trigger electrodes respectively with another output, and the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current is connected between the ground wire 10 and zero line 9 of load end; Weak current detects inductor 18 secondary winding one output and is connected with negative electrode with the 2nd controllable silicon 14 trigger electrodes respectively with another output, and the 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode.

Because the remaining circuit structure of present embodiment earth leakage protective device is all identical with embodiment 5 with composition, only be the control mode difference that triggers the 2nd controllable silicon 14, therefore, do not give unnecessary details at this.

Embodiment 7

Referring to shown in Figure 7; Compare with embodiment 6; Present embodiment has increased the 1st clamp diode 22 anodal clamp circuits of being made up of the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22, voltage stabilizing didoe 23 in the drive circuit of solenoid; Between rectification circuit 12 output head anodes (+) and public pole (com), be connected with the loop that is in series by the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22; The 1st resistance 20 1 ends are connected with rectification circuit 12 output head anodes (+); The 1st resistance 20 other ends are connected with the 2nd resistance 21 1 ends, the 2nd resistance 21 other ends and 22 anodal connections of the 1st clamp diode, and the 1st clamp diode 22 negative poles are connected with step-down rectifying circuit 12 output public poles (com); The 1st resistance 20 other ends, the 2nd resistance 21 1 ends are connected with voltage stabilizing didoe 23 negative poles respectively, and voltage stabilizing didoe 23 positive poles are connected with rectification circuit 12 output public poles (com).

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 2nd controllable silicon the 14, the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22, voltage stabilizing didoe 23; Zero sequence current mutual inductor 15 secondary winding one output is connected with negative electrode with the 1st controllable silicon 13 trigger electrodes respectively with another output, and the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current 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 14 trigger electrodes and the 1st clamp diode 22 positive poles respectively with another output; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; The signal that makes weak current detect the output of inductor 18 secondary winding is superimposed upon on the basis of the 1st clamp diode 22 conduction voltage drops and triggers the 2nd controllable silicon 14, thereby has reduced the requirement that weak current is detected inductor 18 secondary winding output voltages.

Because the remaining circuit structure of present embodiment earth leakage protective device is all identical with embodiment 6 with composition, only be the control mode difference that triggers the 2nd controllable silicon 14, therefore, do not give unnecessary details at this.

Embodiment 8

Referring to shown in Figure 8, a kind of earth leakage protective device mainly detects inductor the 18, the 1st amplifying circuit the 19, the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22, voltage stabilizing didoe 23, electromagnetic trip and locker by shell, power end phase line 5, zero line 6, ground wire 7, load end phase line 8, zero line 9, ground wire 10, rectification circuit the 12, the 1st controllable silicon the 13, the 2nd controllable silicon 14, zero sequence current mutual inductor 15, test loop 16, current limliting Resistor-Capacitor Unit 17, weak current and forms.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, reset key.

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22, voltage stabilizing didoe the 23, the 2nd controllable silicon the 14, the 1st amplifying circuit 19; Zero sequence current mutual inductor 15 secondary winding one output is connected with the 1st controllable silicon 13 trigger electrodes and the 1st clamp diode 22 positive poles respectively with another output; The 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current 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 another input with the 1st amplifying circuit 19 1 inputs respectively with another output; The 1st amplifying circuit 19 triggers output and is connected with the 2nd controllable silicon 14 trigger electrodes; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; Solenoid 11 1 line ends are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with another line end, and rectification circuit 12 1 inputs are connected with power end phase line 5, and its another input is connected with power end zero line 6.

Rectification circuit 12 adopts halfwave rectifier in this example, also can adopt bridge rectifier.

In the present embodiment, current limliting Resistor-Capacitor Unit 17 is a resistance, also can adopt electric capacity or resistance and capacitance component,

During use; When the earth leakage protective device power end is applied the operate as normal power supply; Power end phase line 5, zero line 6; Being connected solenoid 11 energising between power end phase line 5, the zero line 6 produces electromagnetic attractions to make electromagnetic trip and locker is that reset lock is got ready; When pressing with the handgrip reset key; Electromagnetic trip and the locker electromagnetic attraction through solenoid 11 is snap close and make phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 is all closed connects immediately, all connects power end phase line 5 and load end phase line 8, power end zero line 6 with load end ground wire 10 with load end zero line 9, power end ground wire 7, ground wire 7 with 10 because the effects of ground connection are clamped at about zero lying prostrate voltage; Zero line 6 and 9 also is about zero volt simultaneously; Be connected the electric current that weak current between earth leakage protective device power end ground wire 7 and the zero line 6 detects inductor 18 elementary windings and just do not have electric current to flow through or flow through like this and do not reach the threshold values (for example: 10 microamperes) that presets, this moment, earth leakage protective device just remained on the "on" position that resets, thereby for the consuming device power supply of its lower end with ground connection is provided.

During use; The electric leakage and if the consuming device on load end phase line 8, the zero line 9 breaks down 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 be superimposed upon and give the 1st controllable silicon 13 on the basis of the 1st clamp diode 22 conduction voltage drops; And when residual current reaches predefined threshold values (for example: 10 milliamperes); The conducting that is triggered of the 1st controllable silicon 13 makes solenoid 11 on electromagnetic trip and the locker caused by bypass not have electromagnetic attraction and earth leakage protective device is threaded 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; The electric leakage and when not having ground connection (for example: the ground wire virtual connection causes no ground connection on the socket) if the consuming device on the phase line of load end 8, the zero line 9 breaks down in the ground protection system; Metal parts that consuming device exposes and earth leakage protective device ground wire 10 and 7 all can be with dangerous voltage; Being connected weak current between earth leakage protective device 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 to the 1st amplifying circuit 19; And when weak current reaches predefined threshold values (for example: 10 microamperes); The 2nd controllable silicon 14 is made solenoid 11 on electromagnetic trip and the locker caused by bypass by the 1st amplifying circuit 19 triggering and conducting not to be had electromagnetic attraction and earth leakage protective device is threaded off; Thereby 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, ensure people's safety better.

During use; In case power supply takes place unusual; For example phase line on the power supply lines 5 or zero line 6 unexpected disconnections; At this moment rectification circuit 12 outputs in the earth leakage protective device do not have operating current output; Solenoid 11 in electromagnetic trip and the locker does not have electromagnetic attraction to cause electromagnetic trip and locker to thread off automatically owing to dead electricity causes, all break off the phase line contact 1-1 of earth leakage protective device and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 immediately, thereby ensured the safety of people's electricity consumptions better.

Embodiment 9

Referring to shown in Figure 9, to compare with embodiment 8, present embodiment has been cancelled embodiment 8 described voltage stabilizing didoes 23.

In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode the 22, the 2nd controllable silicon the 14, the 1st amplifying circuit 19; Zero sequence current mutual inductor 15 secondary winding one output is connected with the 1st controllable silicon 13 trigger electrodes and the 1st clamp diode 22 positive poles respectively with another output, and the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current 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 another input with the 1st amplifying circuit 19 1 inputs respectively with another output; The 1st amplifying circuit 19 triggers output and is connected with the 2nd controllable silicon 14 trigger electrodes; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; The signal of zero sequence current mutual inductor 15 secondary winding output is superimposed upon on the basis of the 1st clamp diode 22 conduction voltage drops and triggers the 1st controllable silicon 13, thereby reduced requirement zero sequence current mutual inductor 15 secondary winding output voltages.

Since the remaining circuit structure of present embodiment earth leakage protective device with form all identically with embodiment 8, only be the voltage regulation way difference in the drive circuit of triggering the 1st controllable silicon 13, therefore, do not give unnecessary details at this.

Embodiment 10

Referring to shown in Figure 10; Compare with embodiment 8; Present embodiment has been cancelled embodiment 8 described the 1st amplifying circuits 19 in the drive circuit of solenoid; In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22, voltage stabilizing didoe the 23, the 2nd controllable silicon 14, zero sequence current mutual inductor 15 secondary winding one output and another output respectively with the 1st controllable silicon 13 trigger electrodes and 22 anodal connections of the 1st clamp diode, the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current is connected between the ground wire 10 and zero line 9 of load end; Weak current detects inductor 18 secondary winding one output and is connected with negative electrode with the 2nd controllable silicon 14 trigger electrodes respectively with another output; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; Because it is enough big that said weak current detects the signal of inductor 18 secondary winding output, just can not trigger the 2nd controllable silicon 14 so need not amplify.

Because the remaining circuit structure of present embodiment earth leakage protective device is all identical with embodiment 8 with composition, only be the control mode difference that triggers the 2nd controllable silicon 14, therefore, do not give unnecessary details at this.

Embodiment 11

Referring to shown in Figure 11, to compare with embodiment 10, present embodiment has increased the 2nd clamp diode 26 anodal clamp circuits of being made up of the 3rd resistance the 25, the 2nd clamp diode 26 in the drive circuit of solenoid.In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit the 12, the 1st controllable silicon the 13, the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22, voltage stabilizing didoe the 23, the 2nd controllable silicon the 14, the 3rd resistance the 25, the 2nd clamp diode 26; Between rectification circuit 12 output head anodes (+) and public pole (com), be connected with the loop that is in series by the 1st resistance the 20, the 2nd resistance the 21, the 1st clamp diode 22; The 1st resistance 20 1 ends are connected with rectification circuit 12 output head anodes (+); The 1st resistance 20 other ends are connected with the 2nd resistance 21 1 ends; The 2nd resistance 21 other ends and 22 anodal connections of the 1st clamp diode, the 1st clamp diode 22 negative poles are connected with rectification circuit 12 output public poles (com), and the 1st resistance 20 other ends, the 2nd resistance 21 1 ends are connected with voltage stabilizing didoe 23 negative poles respectively; Voltage stabilizing didoe 23 positive poles are connected with rectification circuit 12 output public poles (com); The 3rd resistance 25 1 ends are connected with voltage stabilizing didoe 23 negative poles, the 3rd resistance 25 other ends and 26 anodal connections of the 2nd clamp diode, the 2nd clamp diode 26 negative poles and 23 anodal connections of voltage stabilizing didoe.

Zero sequence current mutual inductor 15 secondary winding one output is connected with the 1st controllable silicon 13 trigger electrodes and the 1st clamp diode 22 positive poles respectively with another output, and the 1st controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting inductor 18 elementary windings and current limliting Resistor-Capacitor Unit 17 is connected, weak current 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 14 trigger electrodes and the 2nd clamp diode 26 positive poles respectively with another output; The 2nd controllable silicon 14 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; Make the signal of signal that weak current detects the output of inductor 18 secondary winding and the output of zero sequence current mutual inductor 15 secondary winding be superimposed upon on the basis of conduction voltage drop of conduction voltage drop and the 1st clamp diode 22 of the 2nd clamp diode 26 respectively and trigger the 2nd controllable silicon 14 and the 1st controllable silicon 13 respectively, thereby reduced requirement weak current detection inductor 18 secondary winding and zero sequence current mutual inductor 15 secondary winding output voltages.

In the present embodiment; The iron core that weak current detects inductor 18 adopts amorphous alloy material to process; Also can adopt ultramicro-crystal 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.

Because the remaining circuit structure of present embodiment earth leakage protective device is all identical with embodiment 10 with composition, only be the control mode difference that triggers the 2nd controllable silicon 14, therefore, do not give unnecessary details at this.

Claims

1. earth leakage protective device; Comprise zero sequence current mutual inductor, test loop, electromagnetic trip and locker that shell, phase line, zero line, ground wire, phase line and zero line all pass; This electromagnetic trip and locker comprise solenoid and drive circuit thereof, contact, spring, reset key; The drive circuit of said solenoid mainly is made up of rectification circuit, the 1st controllable silicon, the 2nd controllable silicon; The drive circuit input of said solenoid is provided with the 1st group of input and the 2nd group of input; Said zero sequence current mutual inductor secondary winding one output and another output respectively with the drive circuit of said solenoid in an input of the 1st group of input be connected with another input; It is characterized in that: 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, and 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; 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; Said weak current detect inductor secondary winding one output and another output respectively with the drive circuit of said solenoid in an input of the 2nd group of input be connected with another input; Said solenoid one line end and another line end, the 1st controllable silicon anode and negative electrode, the 2nd controllable silicon anode and negative electrode are connected in parallel with public pole with said rectification circuit output end is anodal respectively.

2. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with the 1st amplifying circuit, the 2nd amplifying circuit; An input of the 1st group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively said the 2nd amplifying circuit one input and another input in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 1st controllable silicon trigger electrode, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with another input with said the 2nd amplifying circuit one input respectively with another output; Said the 2nd amplifying circuit triggers output and is connected with said the 2nd controllable silicon trigger electrode, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

3. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with the 1st amplifying circuit; An input of the 1st group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively the 2nd controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 1st controllable silicon trigger electrode, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with negative electrode with the 2nd controllable silicon trigger electrode respectively with another output, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

4. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with the 1st amplifying circuit, the 1st resistance, the 2nd resistance, the 1st clamp diode and stabilized voltage power supply; An input of the 1st group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively the 2nd controllable silicon trigger electrode and the 1st clamp diode positive pole in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 1st controllable silicon trigger electrode, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Between said rectification circuit output end positive pole and public 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; 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 public 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 public pole; 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 public pole with said rectification circuit output end is anodal respectively with negative electrode.

5. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with the 1st amplifying circuit; An input of the 1st group of input and another input are respectively said the 1st controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with negative electrode with said the 1st controllable silicon trigger electrode respectively with another output, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 2nd controllable silicon trigger electrode, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

6. earth leakage protective device according to claim 1; It is characterized in that: an input of the 1st group of input and another input are respectively said the 1st controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively said the 2nd controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with negative electrode with said the 1st controllable silicon trigger electrode respectively with another output, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with negative electrode with the 2nd controllable silicon trigger electrode respectively with another output, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

7. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with the 1st resistance, the 2nd resistance, the 1st clamp diode and voltage stabilizing didoe; An input of the 1st group of input and another input are respectively said the 1st controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively said the 2nd controllable silicon trigger electrode and said the 1st clamp diode positive pole in the drive circuit of said solenoid; Said zero sequence current mutual inductor secondary winding one output is connected with negative electrode with said the 1st controllable silicon trigger electrode respectively with another output, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Between said rectification circuit output end positive pole and public 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; 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 public pole, and said the 1st resistance other end also is connected with the voltage stabilizing didoe negative pole respectively with the 2nd resistance one end, and voltage stabilizing didoe is anodal to be connected with said rectification circuit output end public pole; 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 public pole with said rectification circuit output end is anodal respectively with negative electrode.

8. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with the 1st resistance, the 2nd resistance, the 1st clamp diode, stabilized voltage power supply, the 1st amplifying circuit; An input of the 1st group of input and another input are respectively the 1st controllable silicon trigger electrode and said the 1st clamp diode positive pole in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively said the 1st amplifying circuit one input and another input in the drive circuit of said solenoid; Between said rectification circuit output end positive pole and public 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; 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 public 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 public pole; Said zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode, and its another output is connected with said the 1st clamp diode is anodal, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with another input with said the 1st amplifying circuit one input respectively with another output; Said the 1st amplifying circuit triggers output and is connected with said the 2nd controllable silicon trigger electrode, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

9. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with the 1st resistance, the 2nd resistance, the 1st clamp diode, voltage stabilizing didoe; An input of the 1st group of input and another input are respectively the 1st controllable silicon trigger electrode and said the 1st clamp diode positive pole in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively said the 2nd controllable silicon trigger electrode and negative electrode in the drive circuit of said solenoid; Between said rectification circuit output end positive pole and public 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; 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 public pole, and said the 1st resistance other end also is connected with the voltage stabilizing didoe negative pole respectively with the 2nd resistance one end, and voltage stabilizing didoe is anodal to be connected with said rectification circuit output end public pole; Said zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode, and its another output is connected with said the 1st clamp diode is anodal, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Said weak current detects inductor secondary winding one output and is connected with negative electrode with said the 2nd controllable silicon trigger electrode respectively with another output, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

10. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with the 1st resistance, the 2nd resistance, the 1st clamp diode, voltage stabilizing didoe, the 3rd resistance, the 2nd clamp diode; An input of the 1st group of input and another input are respectively the 1st controllable silicon trigger electrode and said the 1st clamp diode positive pole in the drive circuit of said solenoid, and an input of the 2nd group of input and another input are respectively the 2nd controllable silicon trigger electrode and said the 2nd clamp diode positive pole in the drive circuit of said solenoid; Between said rectification circuit output end positive pole and public 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; 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 public pole, and said the 1st resistance other end also is connected with the voltage stabilizing didoe negative pole respectively with the 2nd resistance one end; Voltage stabilizing didoe is anodal to be connected with said rectification circuit output end public pole; The 3rd resistance one end is connected with said voltage stabilizing didoe negative pole, and 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 voltage stabilizing didoe is anodal; Said zero sequence current mutual inductor secondary winding one output is connected with the 1st controllable silicon trigger electrode, and its another output is connected with said the 1st clamp diode is anodal, and the 1st controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; 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 2nd clamp diode is anodal, and the 2nd controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode.

11. earth leakage protective device according to claim 1 is characterized in that: said current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.

12. earth leakage protective device according to claim 1 is characterized in that: said weak current detects the inductor iron core and is processed by permalloy or amorphous alloy or ultramicro-crystal alloy material.

13. earth leakage protective device 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.

14. according to claim 4 or 8 described earth leakage protective devices, it is characterized in that: said stabilized voltage power supply one end and the said stabilized voltage power supply other end can be respectively the voltage stabilizing didoe negative pole with anodal.

15. earth leakage protective device according to claim 4; It is characterized in that: the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 1st amplifying circuit, the 2nd controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode and stabilized voltage power supply, and said stabilized voltage power supply one end and the said stabilized voltage power supply other end can be respectively the power end and ground end of said the 1st amplifying circuit.

16. earth leakage protective device according to claim 8 is characterized in that: the drive circuit of said solenoid is made up of rectification circuit, the 1st controllable silicon, the 1st resistance, the 2nd resistance, the 1st clamp diode, stabilized voltage power supply, the 2nd controllable silicon and the 1st amplifying circuit; Said stabilized voltage power supply one end and the said stabilized voltage power supply other end can be respectively the power end and ground end of said the 1st amplifying circuit.