CN202145517U - Leakage protection plug - Google Patents
Leakage protection plug Download PDFInfo
- Publication number
- CN202145517U CN202145517U CN201120285946U CN201120285946U CN202145517U CN 202145517 U CN202145517 U CN 202145517U CN 201120285946 U CN201120285946 U CN 201120285946U CN 201120285946 U CN201120285946 U CN 201120285946U CN 202145517 U CN202145517 U CN 202145517U
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- sequence current
- zero sequence
- mutual inductor
- resistance
- ground wire
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Abstract
The utility model discloses a leakage protection plug, which can prevent electric shock accidents caused by electric appliance faults, and can also prevent electric shock accidents caused by an accidentally electriferous grounding wire. A loop formed by first and second resistors and a clamping diode through series connection is connected between the positive pole and the negative pole of the output end of a rectification circuit, a detection winding is wound on a zero sequence current transformer, zero sequence current transformer detection and secondary windings are all wound on an iron core of the zero sequence current transformer and insulatedly separated, a detection loop formed by the zero sequence current transformer detection winding and a current limiting capacitance-resistance element through series connection is connected between a grounding line and a zero line, one output end of the zero sequence current transformer secondary winding and the other output end are connected with a silicon controlled trigger pole and the positive pole of the clamping diode, and the anode and the cathode of the silicon controlled are respectively connected with the positive and negative poles of the rectification circuit.
Description
Technical field
The utility model relates to Electrical Safety resist technology field, especially relates to a kind of leakage protecting plug.
Background technology
Chinese patent document CN1142618C discloses the leakage protecting plug that a kind of ground wire can open and close; Not only be provided with zero sequence current mutual inductor that phase line and zero line all pass on this leakage protecting plug, also be provided with the ground wire electrified detection inductor that ground wire passes; Therefore it not only can detect between load end phase line and the zero line and have or not residual current; (for example: 10mA), it will be threaded off immediately, cuts off phase line, zero line and ground wire when occurring residual current between phase, the zero line and reaching the threshold values that presets; And when 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 leakage protecting plug is exactly must have between load end phase, the zero line must have a mind to extrinsic current on residual current or the load end ground wire and flow through and could thread off in the unexpected precondition that can thread off when charged of the electric leakage of load end fault or ground wire; So just there is following defective in existing leakage protecting plug: during use; No matter be when ground protection system ground wire disappearance (for example: the virtual connection of socket ground wire causes no ground connection) and the electric leakage of leakage protecting plug load end consuming device insulation fault; Still when 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; But existing leakage protecting plug can not threaded off in this case automatically; Have only when human body or livestock touch these with the exposed metal parts that power on, just form the loop, leakage protecting plug is threaded off and phase line, zero line, ground wire disconnection in 0.1S thereby produce residual current or the unexpected electric current of ground wire through human body or livestock; Though in time threading off, it has protected the life security of people or livestock; But existing leakage protecting plug be in this case must be earlier through human body or livestock get an electric shock produce residual current or the unexpected electric current of ground wire and flow through human body or livestock after, it could thread off phase line, zero line, ground wire disconnection, still can cause the electric shock accidents of human body or livestock so have leakage protecting plug now.
Summary of the invention
The purpose of the utility model is to provide a kind of leakage protecting plug that can overcome above-mentioned existing leakage protecting plug defective; Electric leakage or load end ground wire not only can take place in load end phase, zero line road and meet accident and can all break off phase line contact, zero line contact and ground wire contact in time when charged in it; And it when the ground protection system ground connection disappearance (for example: the virtual connection of socket ground wire causes no ground connection) and the electric leakage of leakage protecting plug load end consuming device occur and causes on the electric appliance casing band dangerous voltage or 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 break off phase line, zero line and ground wire; For people provide better Electrical Safety guarantee, and the reliability that has also improved leakage protecting plug.
The technical solution that the utility model proposed is such:
A kind of leakage protecting plug; Comprise zero sequence current mutual inductor, test loop, electromagnetic trip and locker that shell and latch, phase line, zero line, ground wire, phase line and zero line all pass; This electromagnetic trip and locker comprise solenoid and drive circuit, contact, spring, push rod resets; The drive circuit of said solenoid mainly is made up of rectification circuit, controllable silicon; Between said rectification circuit output end positive pole and negative pole, be connected with the loop that is in series by the 1st resistance, the 2nd resistance, clamp diode; The 1st resistance one end is connected with rectification circuit output end is anodal, and the 1st resistance other end is connected with the 2nd resistance one end, and the 2nd resistance other end is connected with clamp diode is anodal; The clamp diode negative pole is connected with the rectification circuit output end negative pole; 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 the rectification circuit output end negative pole, also is 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 between winding and the said zero sequence current mutual inductor secondary winding and insulate separately, between ground wire and zero line, is connected with the detection loop that is in series by said zero sequence current mutual inductor detection winding and current limliting Resistor-Capacitor Unit, and said zero sequence current mutual inductor secondary winding one output is connected with said controllable silicon trigger electrode; Its another output is connected with said clamp diode is anodal, and said controllable silicon anode is connected with negative 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 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.
The substantive features of the utility model be between the same phase that can detect load end with existing leakage protecting plug, zero line, to have or not residual current and detect ground wire whether charged and 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; Also be between the ground wire of leakage protecting plug and zero line, to be provided with and detect the loop; 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 leakage protecting plug is threaded off automatically; Break off phase line, zero line, ground wire, thus realized human body or livestock touch these with on just break off phase line, zero line, ground wire entirely before the exposed metal parts of dangerous voltage.
Compared with prior art, the utlity model has following beneficial effect:
(1), the leakage protecting plug of the utility model is owing to be connected with the detection loop that is composed in series by zero sequence current mutual inductor detection winding and current limliting Resistor-Capacitor Unit between ground wire and zero line; When in use; When in case the phase of leakage protecting plug load end, the electric leakage of the consuming device fault on the zero line and ground protection system ground wire lack (for example: the virtual connection of socket ground wire causes no ground connection); Metal parts that consuming device exposes and leakage protecting plug ground wire all can be with dangerous voltage; Zero sequence current mutual inductor will detect, responds to and export signal; Leakage protecting plug, human body or livestock just can in time be broken off phase line, zero line and ground wire before touching consuming device entirely; It in this case must human body than existing leakage protecting plug or livestock touch to constitute the loop and flow through could thread off after the residual current better technical solution be provided, so it is more safer than existing leakage protecting plug.
(2), the leakage protecting plug of the utility model is owing to be connected with the detection loop that is composed in series by zero sequence current mutual inductor detection winding and current limliting Resistor-Capacitor Unit between ground wire and zero line; When in 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; Leakage protecting plug, human body or livestock just can in time be broken off phase line, zero line and ground wire before touching electrical equipment entirely; It must human body than existing leakage protecting plug in this case the time or livestock touch to constitute the loop and flow through could thread off after the unexpected electric current of ground wire better technical solution be provided, so it is more safer than existing leakage protecting plug.
(3), the leakage protecting plug of the utility model is owing to be connected zero sequence current mutual inductor between ground wire and the zero line and detect winding and also can detect, respond to and export signal to the low current signal that flows through it, and this detection winding do not have the restriction of minimum starting voltage, thus it to ground wire with voltage just unrestrictedly; 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; Leakage protecting plug of the present invention will be threaded off, therefore, it not only ground wire (or consuming device exposed metal parts) with dangerous voltage high can thread off during for 250V; And ground wire with voltage (or lower when being low to moderate predetermined 36V safe voltage; For example: 24V) also can reliably thread off, when ground wire with voltage when being lower than predetermined 36V safe voltage, it just need not threaded off to avoid misoperation; The voltage range that it can shield is wide; So leakage protecting plug of the present invention not only uses well, and safety and reliability.
(4), the leakage protecting plug of the utility model also can be threaded off when the phase line of power end and zero line reversal connection automatically; Can not reset; Have only just coming into operation after the correction of the wiring state of supply socket phase line and zero line; Forcibly standard the user side supply socket wiring requirement that must meet national regulation connect, in case other contingencies take place when using.
(5), the leakage protecting plug of the utility model need not be provided with ground wire electrified detection inductor or the instrument transformer that ground wire passes on ground wire, also amplifying circuit need not be set in the drive circuit of solenoid, therefore provide cost savings.
(6), the leakage protecting plug of the utility model is owing to detect winding to zero sequence current mutual inductor and separate independently to be provided with and to make to insulate between them with secondary winding and separate; Make between leakage protecting plug power end and the load end and phase line and zero line improve insulation property between the ground wire and anti-electric breakdown strength ability; Prevent that short circuit still can cause the problem of load end between winding and the secondary winding because zero sequence current mutual inductor detects in leakage protecting plug phase line contact, zero line contact and ground wire contact have broken off following time of situation, thereby improved the reliability of leakage protecting plug.
The leakage protecting plug of the utility model is mainly used on the earth leakage protective of various household electrical appliance.
Description of drawings
Fig. 1 is the leakage protecting plug electrical principle sketch map of the utility model embodiment 1; Its zero sequence current mutual inductor secondary winding one output is connected with the controllable silicon trigger electrode; Its another output is connected with clamp diode is anodal, and the detection loop that is in series by zero sequence current mutual inductor detection winding and current limliting Resistor-Capacitor Unit is connected between the ground wire and zero line of power end.
Fig. 2 is the leakage protecting plug electrical principle sketch map of the utility model embodiment 2; Its zero sequence current mutual inductor secondary winding one output is connected with the controllable silicon trigger electrode; Its another output is connected with clamp diode is anodal, and the detection loop that is in series by zero sequence current mutual inductor detection winding and current limliting Resistor-Capacitor Unit is connected between the ground wire and zero line of load end.
Embodiment
Through following embodiment the utility model is done further to set forth in detail.
Embodiment 1:
Referring to shown in Figure 1; A kind of leakage protecting plug mainly by plug body and phase, zero, phase line 8, zero line 9, ground wire the 10, the 1st resistance the 18, the 2nd resistance 19, clamp diode 20, voltage stabilizing didoe 17, electromagnetic trip and the locker of phase line 5, zero line 6, ground wire 7, rectification circuit 12, controllable silicon 13, zero sequence current mutual inductor 15, test loop 16, current limliting Resistor-Capacitor Unit 14, load end of three utmost point latches, power end form, this electromagnetic trip and locker mainly are made up of solenoid 11 and drive circuit, phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4, spring, the push rod that resets.Be connected with the loop that is in series by the 1st resistance the 18, the 2nd resistance 19, clamp diode 20 between rectification circuit 12 output head anodes and the negative pole; 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; Clamp diode 20 negative poles are connected with rectification circuit 12 negative pole of output end; The 1st resistance 18 other ends, the 2nd resistance 19 1 ends also are connected with voltage stabilizing didoe 17 negative poles respectively, and voltage stabilizing didoe 17 positive poles are connected with rectification circuit 12 negative pole of output end, are wound with on zero sequence current mutual inductor 15 iron cores and detect winding and secondary winding; Zero sequence current mutual inductor 15 secondary winding one output is connected with controllable silicon 13 trigger electrodes; Its another output and 20 anodal connections of clamp diode, controllable silicon 13 anodes are connected with negative pole with rectification circuit 12 output head anodes respectively with negative electrode, and the detection loop that zero sequence current mutual inductor 15 detection windings and current limliting Resistor-Capacitor Unit 14 are in series is connected between the ground wire 7 and zero line 6 of power end; The signal of zero sequence current mutual inductor 15 secondary winding output is superimposed upon on the basis of clamp diode 20 conduction voltage drops (about 0.3V) and triggers controllable silicon 13 conductings, thereby reduced requirement zero sequence current mutual inductor 15 secondary winding output voltages.
In the present embodiment, current limliting Resistor-Capacitor Unit 14 is a current-limiting resistance, also can adopt electric capacity or resistance and capacitance component.
During use; Press the push rod that resets of leakage protecting plug; Phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2 and ground wire contact 3 and 4 all normally closed are connected; The phase line 8 of load end, zero line 9, ground wire 10 are connected with phase line 5, zero line 6, the ground wire 7 of power end respectively; Ground wire 7 and 10 is because the effects of ground connection are clamped at about zero volt voltage, and zero line 6 and 9 also is about zero volt simultaneously, is connected the ground wire 7 of leakage protecting plug power end and electric current that the 15 detection windings of the zero sequence current mutual inductor between the zero line 6 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; And the rectification circuit 12 that is connected between phase line 8 and the zero line 9 gets; Clamp diode 20 is through the 1st resistance the 18, the 2nd resistance 19 step-down current limlitings, voltage stabilizing didoe 17 voltage stabilizings and conducting, and the forward voltage of its positive terminal is clamped at about about 0.3V after clamp diode 20 conductings, owing to this clamp voltage also is not enough to trigger controllable silicon 13 conductings; Leakage protecting plug just remains on the "on" position that resets like this, thereby for the power supply of the consuming device of its lower end with ground connection is provided.
During use; If the consuming device fault on the phase line of load end 8, the zero line 9 electric leakage and under the normal situation of ground protection system; 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; This signal will be superimposed upon the about 0.3V of clamp diode 20 forward conduction voltage drops and go up to controllable silicon 13, and when residual current reached predefined threshold values (for example: 10 milliamperes), controllable silicon 13 was by zero sequence current mutual inductor 15 triggering and conducting; Solenoid 11 on electromagnetic trip and the locker gets the electric leakage protecting plug that makes and threads off, and before people touch consuming device, just can in time all break off phase line contact 1-1 and 2-1, zero line contact 1-2 and 2-2, ground wire contact 3 and 4; If the consuming device fault on the phase line of load end 8, the zero line 9 electric leakage and when not having ground connection (for example: the ground wire virtual connection causes no ground connection on the socket) in the ground protection system; Metal parts that consuming device exposes and leakage protecting plug ground wire 10 and 7 all can be with dangerous voltage; Ground wire 7 and the zero sequence current mutual inductor between the zero line 6 15 that is connected the leakage protecting plug power end detects windings and just has a weak current and flow through; Zero sequence current mutual inductor 15 secondary winding can be exported a signal; This signal will be superimposed upon the about 0.3V of clamp diode 20 forward conduction voltage drops and go up to controllable silicon 13; And when weak current reaches predefined threshold values (for example: 10 microamperes); Controllable silicon 13 is by zero sequence current mutual inductor 15 triggering and conducting; Solenoid 11 on electromagnetic trip and the locker the electric leakage protecting plug that make 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, thereby 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 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 secondary winding can be responded to signal of output, and this signal will be superimposed upon the about 0.3V of clamp diode 20 forward conduction voltage drops and go up to controllable silicon 13, and when weak current reaches predefined threshold values (for example: 10 microamperes); Controllable silicon 13 is by zero sequence current mutual inductor 15 triggering and conducting; Solenoid 11 on electromagnetic trip and the locker the electric leakage protecting plug that make 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, thereby ensure people's safety better.
Embodiment 2:
Referring to shown in Figure 2; Compare with embodiment 1; In the present embodiment, except detect zero sequence current mutual inductor 15 windings and detection loop that current limliting Resistor-Capacitor Unit 14 is composed in series change between the ground wire 10 that is connected to load end and the zero line 9 different, remaining is all identical.
In the present embodiment, current limliting Resistor-Capacitor Unit 14 is a current-limiting resistance, also can adopt electric capacity or resistance and capacitance component.
Because the remaining circuit structure of present embodiment leakage protecting plug is all identical with embodiment 1, the connected mode in the detection loop that only to be zero sequence current mutual inductor 15 detection windings be composed in series with current limliting Resistor-Capacitor Unit 14 is different, therefore, does not give unnecessary details at this.
Claims (3)
1. leakage protecting plug; Comprise zero sequence current mutual inductor, test loop, electromagnetic trip and locker that shell and latch, phase line, zero line, ground wire, phase line and zero line all pass; This electromagnetic trip and locker comprise solenoid and drive circuit, contact, spring, push rod resets; The drive circuit of said solenoid mainly is made up of rectification circuit, controllable silicon; It is characterized in that: between said rectification circuit output end positive pole and negative pole, be connected with the loop that is in series by the 1st resistance, the 2nd resistance, clamp diode, the 1st resistance one end is connected with rectification circuit output end is anodal, and 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 the rectification circuit output end negative pole, and 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 the rectification circuit output end negative pole; 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 zero sequence current mutual inductor secondary winding one output is connected with said controllable silicon trigger electrode, and its another output is connected with said clamp diode is anodal, and said controllable silicon anode is connected with negative pole with said rectification circuit output end is anodal respectively with negative electrode.
2. leakage protecting plug according to claim 1 is characterized in that: said current limliting Resistor-Capacitor Unit is resistance or electric capacity or resistance and capacitance component.
3. leakage protecting plug 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120285946U CN202145517U (en) | 2011-08-09 | 2011-08-09 | Leakage protection plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120285946U CN202145517U (en) | 2011-08-09 | 2011-08-09 | Leakage protection plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202145517U true CN202145517U (en) | 2012-02-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120285946U Expired - Lifetime CN202145517U (en) | 2011-08-09 | 2011-08-09 | Leakage protection plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202145517U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354868A (en) * | 2011-08-09 | 2012-02-15 | 刘睿刚 | Electric leakage protection plug |
-
2011
- 2011-08-09 CN CN201120285946U patent/CN202145517U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354868A (en) * | 2011-08-09 | 2012-02-15 | 刘睿刚 | Electric leakage protection plug |
| CN102354868B (en) * | 2011-08-09 | 2013-03-27 | 刘睿刚 | Electric leakage protection plug |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120215 Effective date of abandoning: 20130327 |
|
| RGAV | Abandon patent right to avoid regrant |