CN102354948A - Leakage protecting apparatus - Google Patents
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- CN102354948A CN102354948A CN2011102927600A CN201110292760A CN102354948A CN 102354948 A CN102354948 A CN 102354948A CN 2011102927600 A CN2011102927600 A CN 2011102927600A CN 201110292760 A CN201110292760 A CN 201110292760A CN 102354948 A CN102354948 A CN 102354948A
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Abstract
The invention discloses a leakage protecting apparatus, which not only can prevent electric-shock accidents caused by malfunctions of electric appliances, but also can prevent the electric-shock accidents caused by accidental electrification of a ground wire. A zero-sequence current mutual inductor of the leakage protecting device is also provided with a detection winding, the detection winding of the zero-sequence current mutual inductor is separated from a secondary winding of the zero-sequence current mutual inductor in an insulation way, a detection circuit which is formed by serially joining the detection winding of the zero-sequence current mutual inductor and a current-limiting resistance-capacitance element is arranged between a ground wire and a zero wire, one terminal and another terminal of an electromagnetic coil are respectively connected with the anode and the cathode of a controllable silicon, and one output end and another output end of a primary winding of the zero-sequence current mutual inductor are respectively connected with one input end and another input end of a driving circuit of the electromagnetic coil.
Description
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.Hence one can see that; 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 supply simultaneously; Or power end phase line and ground wire reversal connection); At this moment the electromagnetic trip in the existing earth leakage protective device and the solenoid of 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.
Chinese patent document publication number is that CN102064522A also discloses a kind of new type electric leakageproof device; This kind earth leakage protective device is provided with phase line, zero line, ground wire, tripping coil, zero sequence current mutual inductor and control circuit; This control circuit includes main control chip, controllable silicon and rectifier; Though this kind earth leakage protective device is connected with the elementary winding of zero sequence current mutual inductor between ground wire and zero line; But zero sequence current mutual inductor secondary winding one output head grounding in this earth leakage protective device; Another output of zero sequence current mutual inductor secondary winding is connected to an input (pin 3.) of the main control chip in the control circuit; Like this zero sequence current mutual inductor secondary winding output two ends just not with control circuit in the input two ends of main control chip form the loop; Therefore main control chip can not amplify the signal that the zero sequence current mutual inductor secondary winding is exported, and main control chip can not be exported signal and remove to trigger controllable silicon the earth leakage protective device tripping operation is cut off the electricity supply, so can not reach the guarantee aim of safe power utilization; And its tripping coil one line end is connected with phase line; Rectifier one input is connected with zero line with another line end of tripping coil respectively with another input; Be that tripping coil is connected between phase line and the zero line through rectifier and controllable silicon formation series loop; Make tripping coil get electric generation electromagnetic attraction through the conducting of triggering controllable silicon and just can make this earth leakage protective device dropout outage, like this when unusual (for example zero-power line accident disconnection) and consuming device electric leakage take place power supply, because its control circuit, tripping coil can not be worked; Solenoid does not produce the outage of can not threading off of electromagnetic attraction thereby this earth leakage protective device, can't ensure the safety of people's electricity consumption.
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 can also be when unusual (for example: when the power end phase line or zero line is unexpected breaks off or power end phase line and ground wire reversal connection) takes place in power end automatically mutually, zero reach ground wire and 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 is made up of rectification circuit, controllable silicon; Said controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode; Also be wound with the detection winding on the said zero sequence current mutual inductor; Said zero sequence current mutual inductor detection winding and said zero sequence current mutual inductor secondary winding are all on said zero sequence current mutual inductor iron core; Said zero sequence current mutual inductor detects and insulate between winding and the said zero sequence current mutual inductor secondary winding separately; Between ground wire and zero line, be connected with the detection loop that is in series by said zero sequence current mutual inductor detection winding and current limliting Resistor-Capacitor Unit, said solenoid one line end is connected with negative electrode with said controllable silicon anode respectively with another line end, and said zero sequence current mutual inductor secondary winding one output is connected with another input with drive circuit one input of said solenoid respectively with another output.
When the drive circuit of said solenoid by rectification circuit, controllable silicon, when amplifying circuit is formed; Drive circuit one input and another input of said solenoid are respectively said amplifying circuit one input and another input; Be that zero sequence current mutual inductor secondary winding one output is connected with another input with said amplifying circuit one input respectively with another output; Said amplifying circuit triggers output and is connected with said controllable silicon trigger electrode; Said controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode, and said solenoid one line end is connected with negative electrode with said controllable silicon anode respectively with another line end.
When the drive circuit of said solenoid by rectification circuit, when controllable silicon is formed; Drive circuit one input and another input of said solenoid are respectively said controllable silicon trigger electrode and negative electrode; Be that zero sequence current mutual inductor secondary winding one output is connected with negative electrode with said controllable silicon trigger electrode respectively with another output; Said controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode, and said solenoid one line end is connected with negative electrode with said controllable silicon anode respectively with another line end.
When the drive circuit of said solenoid is made up of rectification circuit, controllable silicon, the 1st resistance, the 2nd resistance, clamp diode and voltage stabilizing didoe; Drive circuit one input of said solenoid and another input are respectively said controllable silicon trigger electrode and said clamp diode is anodal; 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, 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 clamp diode is anodal; The clamp diode negative pole is connected with said rectification circuit output end public pole; Said the 1st resistance other end, the 2nd resistance one end also are connected with the voltage stabilizing didoe negative pole respectively, and voltage stabilizing didoe is anodal to be connected with said rectification circuit output end public pole, and promptly zero sequence current mutual inductor secondary winding one output is connected with said controllable silicon trigger electrode and said clamp diode are anodal respectively with another output; Said controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode, and said solenoid one line end is connected with negative electrode with said controllable silicon anode respectively with another line end.
Said current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.
Said zero sequence current mutual inductor detects between ground wire and the zero line that detection loop that winding and current limliting Resistor-Capacitor Unit be in series is connected power end or between the ground wire and zero line of load end.
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 by detecting the detection loop that winding and current limliting Resistor-Capacitor Unit are in series between ground wire and zero line; And cause the ground wire accident to be 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 at the ground protection system exception; 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 (for example: zero-power line breaks off) when unusual also taking place in it 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, also 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 zero sequence current mutual inductor detection winding 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; Zero sequence current mutual 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 must make human body or livestock touch in this case than existing earth leakage protective device and flow through could thread off after the residual current provides better security protection, 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 zero sequence current mutual inductor detection winding 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; Zero sequence current mutual 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 must make human body or livestock touch in this case than existing earth leakage protective device and flow through could thread off after the unexpected electric current of ground wire provides better security protection, so it is more safer than existing earth leakage protective device.
(3), earth leakage protective device of the present invention is because the zero sequence current mutual inductor detection winding 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 detection 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 zero sequence current mutual inductor detection winding; 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 is arranged on the zero sequence current mutual inductor detecting winding, provide cost savings.
(6), 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.
(7), 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, and its zero sequence current mutual inductor secondary winding one output is connected with another input with 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, and its zero sequence current mutual inductor secondary winding one output is connected with negative electrode with the 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, and its zero sequence current mutual inductor secondary winding one output is connected with controllable silicon trigger electrode and clamp diode are anodal respectively with another output.
Embodiment
Through following embodiment the present invention is done further to set forth in detail.
Referring to shown in Figure 1, a kind of earth leakage protective device mainly is made up of phase line 5, zero line 6, ground wire 7, load end phase line 8, zero line 9, ground wire 10, rectification circuit 12, controllable silicon 13, amplifying circuit 14, zero sequence current mutual inductor 15, test loop 16, current limliting Resistor-Capacitor Unit 17, electromagnetic trip and the locker of shell, power end.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 12, controllable silicon 13, amplifying circuit 14; Zero sequence current mutual inductor 15 secondary winding one output is connected with another input (VF) with amplifying circuit 14 1 inputs (VR) respectively with another output; Amplifying circuit 14 triggers output (SCR Trigger) and is connected with controllable silicon 13 trigger electrodes; Controllable silicon 13 anodes are connected with public pole (com) with rectification circuit 12 output head anodes (+) respectively with negative electrode; After detecting winding and current limliting Resistor-Capacitor Unit 17 is connected, zero sequence current mutual inductor 15 is connected between the ground wire 7 and zero line 6 of power end; Solenoid 11 1 line ends are connected with the negative electrode utmost point with controllable silicon 13 anodes respectively with another line end, amplifying circuit 14 power ends (+VS) being connected with rectification circuit 12 output head anodes (+) after the series limiting resistor, amplifying circuit 14 ground ends (GND) are connected with rectification circuit 12 output public poles (com); Be connected with power end phase line 5 after the rectification circuit 12 1 input series limiting resistor, rectification circuit 12 another inputs are connected with power end zero line 6; The detection winding of zero sequence current mutual inductor 15 and secondary winding are all on the zero sequence current mutual inductor iron core and detect to insulate between winding and the secondary winding and separate.
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, zero sequence current mutual inductor 15 detects the detection loop that 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; Power end to earth leakage protective device applies the operate as normal power supply; Power end phase line 5, zero line 6; The solenoid 11 that is connected between power end phase line 5, the zero line 6 must electric generation electromagnetic attraction be that electromagnetic trip and locker reset lock are ready through rectification circuit 12; When pressing with the handgrip reset key; The electromagnetic attraction effect through solenoid 11 of electromagnetic trip and locker 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 zero sequence current mutual inductor 15 between earth leakage protective device power end ground wire 7 and the zero line 6 detects 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 give amplifying circuit 14; And when residual current reaches predefined threshold values (for example: 10 milliamperes); Controllable silicon 13 is exaggerated circuit 14 triggering and conducting, and the solenoid 11 on electromagnetic trip and the locker is caused by bypass does not have electromagnetic attraction that 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 zero sequence current mutual inductor 15 between earth leakage protective device power end ground wire 7 and the zero line 6 detects windings and just has a weak current and flow through; Zero sequence current mutual inductor 15 secondary winding can be exported a signal and give amplifying circuit 14; And when weak current reaches predefined threshold values (for example: 10 microamperes); Controllable silicon 13 is exaggerated circuit 14 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 zero sequence current mutual inductor between the zero line 6 15 that is connected power end like this detects windings and just has a weak current and flow through; Zero sequence current mutual inductor 15 detects signal of winding output and gives amplifying circuit 14; And when weak current reached predefined threshold values (for example: 10 microamperes), controllable silicon 13 was exaggerated circuit 14 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; 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 the 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, and all breaks off earth leakage protective device phase line contact 1-1 and 2-1, 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 2
Referring to shown in Figure 2, to compare with embodiment 1, present embodiment has been cancelled embodiment 1 described amplifying circuit 14 in the drive circuit of solenoid.In the present embodiment; The drive circuit of said solenoid 11 is made up of rectification circuit 12, controllable silicon 13; Zero sequence current mutual inductor 15 secondary winding one output is connected with negative electrode with controllable silicon 13 trigger electrodes respectively with another output; Controllable silicon 13 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 the negative electrode utmost point with controllable silicon 13 anodes respectively with another line end; Be connected between the ground wire 10 and zero line 9 of load end after zero sequence current mutual inductor 15 detects winding and current limliting Resistor-Capacitor Unit 17 is connected,, can directly do not trigger controllable silicon 13 so just need not amplify because the signal of said zero sequence current mutual inductor secondary winding output is enough big.
In the present embodiment, current limliting Resistor-Capacitor Unit 17 is a current-limiting resistance, also can adopt electric capacity or resistance and capacitance component.
In the present embodiment, zero sequence current mutual inductor 15 detects the detection loop that 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 controllable silicon 13, 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 clamp diode 20 anodal clamp circuits of being made up of the 1st resistance the 18, the 2nd resistance 19, clamp diode 20, voltage stabilizing didoe 21 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 18, the 2nd resistance 19, clamp diode 20; The 1st resistance 18 1 ends are connected with rectification circuit 12 output head anodes (+); The 1st resistance 18 other ends are connected with the 2nd resistance 19 1 ends, the 2nd resistance 19 other ends and 20 anodal connections of clamp diode, and clamp diode 20 negative poles are connected with rectification circuit 12 output public poles (com); The 1st resistance 18 other ends, the 2nd resistance 19 1 ends are connected with voltage stabilizing didoe 21 negative poles respectively, and voltage stabilizing didoe 21 positive poles are connected with rectification circuit 12 output public poles (com).
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 12, controllable silicon the 13, the 1st resistance the 18, the 2nd resistance 19, clamp diode 20, voltage stabilizing didoe 21; Zero sequence current mutual inductor 15 secondary winding one output is connected with controllable silicon 13 trigger electrodes and clamp diode 20 positive poles respectively with another output, and controllable silicon 13 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 negative electrode with controllable silicon 13 anodes respectively with another line end, are connected between the ground wire 7 and zero line 6 of power end after zero sequence current mutual inductor 15 detects winding and current limliting Resistor-Capacitor Unit 17 is connected.
In the present embodiment, zero sequence current mutual inductor 15 detects the detection loop that 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 1 with composition, only be the control mode difference that triggers controllable silicon 13, therefore, do not give unnecessary details at this.
Claims (6)
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 is made up of rectification circuit, controllable silicon; Said controllable silicon anode is connected with public pole with said rectification circuit output end is anodal respectively with negative electrode, it is characterized in that: also be wound with the detection winding on the said zero sequence current mutual inductor; All on said zero sequence current mutual inductor iron core, said zero sequence current mutual inductor detects and insulate between winding and the said zero sequence current mutual inductor secondary winding separately for said zero sequence current mutual inductor detection winding and said zero sequence current mutual inductor secondary winding; Between ground wire and zero line, be connected with the detection loop that is in series by said zero sequence current mutual inductor detection winding and current limliting Resistor-Capacitor Unit; Said solenoid one line end is connected with negative electrode with said controllable silicon anode respectively with another line end; Said zero sequence current mutual inductor secondary winding one output is connected with another input with drive circuit one input of said solenoid respectively with another output.
2. earth leakage protective device according to claim 1 is characterized in that: the drive circuit of said solenoid also is provided with amplifying circuit; Drive circuit one input and another input of said solenoid are respectively said amplifying circuit one input and another input; Said amplifying circuit triggers output and is connected with said controllable silicon trigger electrode.
3. earth leakage protective device according to claim 1 is characterized in that: drive circuit one input and another input of said solenoid are respectively said controllable silicon trigger electrode and 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 resistance, the 2nd resistance, clamp diode and voltage stabilizing didoe; Drive circuit one input of said solenoid and another input are respectively said controllable silicon trigger electrode and said clamp diode is anodal; 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, 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 clamp diode is anodal; The clamp diode negative pole is connected with said rectification circuit output end public pole, and said the 1st resistance other end, the 2nd resistance one end also are connected with the voltage stabilizing didoe negative pole respectively, and voltage stabilizing didoe is anodal to be connected with said rectification circuit output end public pole.
5. 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.
6. earth leakage protective device according to claim 1 is characterized in that: said zero sequence current mutual inductor detects between ground wire and the zero line that detection loop that winding and current limliting Resistor-Capacitor Unit be in series is connected power end or between the ground wire and zero line of load end.
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| CN 201110292760 CN102354948B (en) | 2011-10-05 | 2011-10-05 | Leakage protecting apparatus |
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| CN 201110292760 CN102354948B (en) | 2011-10-05 | 2011-10-05 | Leakage protecting apparatus |
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| US20040070895A1 (en) * | 2002-10-09 | 2004-04-15 | Gershen Bernard J. | Leakage current detection interrupter extension cord with cord diagnostics and/or inadvertent ground-to-neutral detection |
| CN201215851Y (en) * | 2008-05-05 | 2009-04-01 | 钱加灿 | Full functional safe plug |
| CN202260374U (en) * | 2011-10-05 | 2012-05-30 | 刘睿刚 | Earth leakage protection device |
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2011
- 2011-10-05 CN CN 201110292760 patent/CN102354948B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040070895A1 (en) * | 2002-10-09 | 2004-04-15 | Gershen Bernard J. | Leakage current detection interrupter extension cord with cord diagnostics and/or inadvertent ground-to-neutral detection |
| CN201215851Y (en) * | 2008-05-05 | 2009-04-01 | 钱加灿 | Full functional safe plug |
| CN202260374U (en) * | 2011-10-05 | 2012-05-30 | 刘睿刚 | Earth leakage protection device |
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