CN203180491U - Electric leakage protection device - Google Patents
Electric leakage protection device Download PDFInfo
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- CN203180491U CN203180491U CN 201220576232 CN201220576232U CN203180491U CN 203180491 U CN203180491 U CN 203180491U CN 201220576232 CN201220576232 CN 201220576232 CN 201220576232 U CN201220576232 U CN 201220576232U CN 203180491 U CN203180491 U CN 203180491U
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Abstract
The utility model discloses an electric leakage protection device. The electric leakage protection device includes a phase line L1, a null line N1, a ground line G1, a phase line L2, a null line N2, a ground G2, a zero-sequence current transformer, a test circuit, a contact closing and disconnecting mechanism and a drive circuit; a detection circuit is connected between the phase line L1, the null line N1 and the ground line G1, wherein the detection circuit is used for detecting the residual current of the phase line L1 and the null line N1 and the voltage on the ground line G1; and an output loop of the detection circuit passes through the zero-sequence current transformer. The electric leakage protection device of the utility model can not only assist in preventing electric shock accidents caused by faults of electrical appliances, but also can assist in preventing electric shock accidents caused by unexpected electrification of the ground lines; and the detection circuit can compare the voltage of the ground lines with preset reference voltage, and once dangerous voltage or no voltage exists on the ground lines, tripping and power disconnection can be performed.
Description
Technical field
The utility model relates to a kind of earth leakage protective device, and particularly a kind of fire with ground wire dangerous voltage measuring ability, zero, ground wire on-off type earth leakage protective device belong to the protective device technical field of low-voltage electrical apparatus.
Background technology
At present; China's electrical network situation complexity; exist potential safety hazard more; power failures such as the appliance socket wiring of family expenses is incorrect, imperfect earth, electric wire are with low quality can cause the unusual charged electric appliance casing that makes of ground wire charged, and the user continues to make electrical appliance can cause electric shock accidents because not obtaining timely power-off protection or prompting.
The existing earth leakage protective device in market is unexpected when charged at break down electric leakage or ground wire of load end, produces between phase line, the zero line dangerous currents to occur on residual current or the ground wire and flow through the action of could threading off.Existing earth leakage protective device in use; when ground protection system ground wire disappearance (as: socket ground wire unsettled and do not have ground connection); no matter during the electric leakage of earth leakage protective device load end consuming device insulation fault; still when ground protection system exception (as: phase line and 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 current circuit, thereby also do not produce residual current or ground wire dangerous currents.Although consuming device exposed metal parts have been with dangerous voltage, the tripping operation of all can not threading off in this case of existing earth leakage protective device.
The utility model content
Task of the present utility model provides a kind of apparatus failure or power ground of preventing and has dangerous voltage and cause the fire of electric shock accidents, zero, ground wire on-off type earth leakage protective device.
A kind of earth leakage protective device; comprise phase line L1, zero line N1, ground wire G1, phase line L2, zero line N2, ground wire G2, zero sequence current mutual inductor, hookup, contact closure and release mechanism, drive circuit; be connected with the residual current that detects phase line L1 and zero line N1 and the testing circuit that detects the voltage on the ground wire G1 between phase line L1, zero line N1 and the ground wire G1, the output loop of described testing circuit passes zero sequence current mutual inductor.
Further, described testing circuit is by resistance R 5, resistance R 6, resistance R 7, capacitor C 3, diode D2, diode D3, voltage stabilizing didoe ZD1, voltage stabilizing didoe ZD2, LED 2 and operational amplification circuit U1 form, one end of resistance R 6 connects ground wire G1, the other end of resistance R 6 connects the anode of diode D3, the inverting input of diode (D3) negative electrode concatenation operation amplifying circuit U1, one end of resistance R 5 connects phase line L1, the other end of resistance R 5 connects the anode of diode D2, the in-phase input end of the negative electrode concatenation operation amplifying circuit U1 of diode D2, the positive source of operational amplification circuit U1, one end of resistance R 7, the anode of the negative electrode of voltage stabilizing didoe ZD1 and capacitor C 3, the negative electrode of capacitor C 3 connects the anode of zero line N1 and voltage stabilizing didoe ZD2, the anode of voltage stabilizing didoe ZD1 connects the negative electrode of voltage stabilizing didoe ZD2 and the power cathode of operational amplification circuit U1, the other end of resistance R 7 connects the anode of LED 2, the output of the negative electrode concatenation operation amplifying circuit U1 of LED 2.
Further, described testing circuit is by resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 3, diode D2, voltage stabilizing didoe ZD1, LED 2 and operational amplification circuit U1 form, one end of resistance R 6 connects ground wire G1, the in-phase input end of the other end concatenation operation amplifying circuit U1 of resistance R 6, one end of resistance R 5 connects phase line L1, the other end of resistance R 5 connects the anode of diode D2, the positive source of the negative electrode concatenation operation amplifying circuit U1 of diode D2, one end of resistance R 8, the anode of capacitor C 3, one end of resistance R 9 and the negative electrode of voltage stabilizing didoe ZD1, the negative electrode of capacitor C 3 connects zero line N1, the anode of voltage stabilizing didoe ZD1, the power cathode of operational amplification circuit U1, one end of resistance R 10 and the negative electrode of LED 2, the other end of resistance R 9 connects the other end of resistance R 10 and the inverting input of operational amplification circuit U1, the output of one end concatenation operation amplifying circuit U1 of resistance R 7 and the other end of resistance R 8, the other end of resistance R 7 connects the anode of LED 2.
Further, the circuit of the output of the negative electrode concatenation operation amplifying circuit U1 of the LED 2 in the described testing circuit will pass zero sequence current mutual inductor.
Further, the circuit of the power cathode of the negative electrode concatenation operation amplifying circuit U1 of the LED 2 in the described testing circuit will pass zero sequence current mutual inductor.
Compared with prior art; the technical solution of the utility model has the following advantages: can detect the load phase except same; when between the zero line residual current being arranged; move immediately phase; zero; outside ground wire all disconnects; the power end of earth leakage protective device of the present utility model is connected with testing circuit; when causing the ground wire accident, the ground protection system exception is with dangerous voltage; or ground protection system earth disappearance; or consuming device electric leakage is when causing on exposed metal parts and the ground tape dangerous voltage; it can both detect; and in phase; between the zero line and ground wire when breaking down respectively or simultaneously; leakage protecting plug is threaded off automatically; the power end phase line; zero line; ground wire disconnects, and makes the dangerous charged prompting of ground wire.
Description of drawings
Fig. 1 is the electric theory diagram of an embodiment of the present utility model.
Fig. 2 is the electrical schematic diagram of an embodiment of the present utility model.
Fig. 3 is the electrical schematic diagram of another embodiment of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for explanation the utility model, but are not used for limiting scope of the present utility model.
Embodiment one
A kind of earth leakage protective device as depicted in figs. 1 and 2; comprise phase line L1, zero line N1, ground wire G1, phase line L2, zero line N2, ground wire G2, zero sequence current mutual inductor, hookup, contact closure and release mechanism, drive circuit; be connected with the residual current that detects phase line L1 and zero line N1 and the testing circuit that detects the voltage on the ground wire G1 between phase line L1, zero line N1 and the ground wire G1, the output loop of testing circuit passes zero sequence current mutual inductor.
Described testing circuit is by resistance R 5, resistance R 6, resistance R 7, capacitor C 3, diode D2, diode D3, voltage stabilizing didoe ZD1, voltage stabilizing didoe ZD2, LED 2 and operational amplification circuit U1 form, one end of resistance R 6 connects ground wire G1, the other end of resistance R 6 connects the anode of diode D3, the inverting input of diode D3 negative electrode concatenation operation amplifying circuit U1, one end of resistance R 5 connects phase line L1, the other end of resistance R 5 connects the anode of diode D2, the in-phase input end of the negative electrode concatenation operation amplifying circuit U1 of diode D2, the positive source of operational amplification circuit U1, one end of resistance R 7, the anode of the negative electrode of voltage stabilizing didoe ZD1 and capacitor C 3, the negative electrode of capacitor C 3 connects the anode of zero line N1 and voltage stabilizing didoe ZD2, the anode of voltage stabilizing didoe ZD1 connects the negative electrode of voltage stabilizing didoe ZD2 and the power cathode of operational amplification circuit U1, the other end of resistance R 7 connects the anode of LED 2, and the negative electrode of LED 2 passes the output of zero sequence current mutual inductor concatenation operation amplifying circuit U1.
Phase line L2 and zero line N2 pass zero sequence current mutual inductor, one end of the solenoid in contact closure and the release mechanism is connected phase line L2, the other end of the solenoid in contact closure and the release mechanism is connected the anode of diode D1, described drive circuit is by diode D1, resistance R 1, resistance R 3, capacitor C 1, capacitor C 2 and controllable silicon SCR are formed, the negative electrode of diode D1 connects the anode of controllable silicon SCR, the negative electrode of controllable silicon SCR connects zero line N2, one end of capacitor C 2 and an end of resistance R 3, the trigger electrode of controllable silicon SCR connects the other end of capacitor C 2 and the other end of resistance R 3, the be connected in parallel two ends of resistance R 3 of two secondary output ends of zero sequence current mutual inductor.
When the reset key of earth leakage protective device is pressed; the phase line L1 of power end; zero line N1 and ground wire G1 connect the phase line L2 of load end respectively; zero line N2 and ground wire G2; the voltage of the zero line N1 of power end and ground wire G1 is zero during normal condition; have only phase line L1 charged; phase line L1 and zero line N1 provide power supply for testing circuit; the two ends of voltage stabilizing didoe ZD1 provide power supply and the reference voltage of usefulness relatively for operational amplification circuit U1; ground wire G1 is connected to the inverting input of operational amplification circuit U1 by resistance R 6 and diode D3; operational amplification circuit U1 is by judging output high level or low level to the voltage of ground wire G1 and the contrast of reference voltage.
When the voltage of ground wire G1 and G2 is zero, or it is with voltage and do not reach when setting threshold values (as: 36V), the output of operational amplification circuit U1 still keeps high level, LED 2 not conductings (being that indicator light does not work), there are not enough electric currents by the endoporus of zero sequence current mutual inductor, zero sequence current mutual inductor does not have enough triggering signal output yet, controllable silicon SCR is not received triggering signal, keep cut-off state, drive circuit does not drive the solenoid in contact closure and the release mechanism, and contact closure and release mechanism still remain closed.
Non-vanishing and institute is with voltage when setting threshold values (as: 36V) when the voltage of ground wire G1 and G2, or ground wire virtual connection and when causing no ground connection, the output of operational amplification circuit U1 then transfers low level to, LED 2 conductings (are that indicator light is lighted, prompting user ground wire electrification), the electric current of conducting is by the endoporus of zero sequence current mutual inductor, zero sequence current mutual inductor output triggering signal, controllable silicon SCR is received triggering signal and conducting, the solenoid that drives in contact closure and the release mechanism produces electromagnetic force, contact closure and release mechanism become off-state by closure state, the phase line L1 of the end of cutting off the electricity supply, zero line N1, the phase line L2 of ground wire G1 and load end, zero line N2, the connection of ground wire G2.
Phase line L2 when load end; consuming device on the zero line N2 breaks down when electric leakage causes ground wire G1 with the ground protection system exception and the G2 accident is charged takes place simultaneously; the vector of the conducting electric current of the residual current of phase line L2 and zero line N2 and LED 2 and non-vanishing and greater than setting the induction operating value; zero sequence current mutual inductor output triggering signal; controllable silicon SCR is received triggering signal and conducting; the solenoid that drives contact closure and release mechanism produces electromagnetic force; contact closure and release mechanism become off-state by closure state, the phase line L1 of the end of cutting off the electricity supply; zero line N1; the phase line L2 of ground wire G1 and load end; zero line N2; the connection of ground wire G2.
When the zero utmost point of power supply power supply base connects instead with the utmost point mutually, when namely the zero line N1 of power end and phase line L1 were by reversal connection, zero line N1 was charged, and phase line L1 and ground wire G1 are no-voltage.Testing circuit is in the negative half period work of sinusoidal alternating current, the voltage of ground wire G1 is higher than the reference voltage of operational amplification circuit U1 at this moment, operational amplification circuit U1 output is low level, LED 2 conductings (are that indicator light is lighted, prompting user power end zero connects instead mutually), the electric current of conducting is by the endoporus of zero sequence current mutual inductor, zero sequence current mutual inductor output triggering signal, controllable silicon SCR is received triggering signal and conducting, the solenoid that drives contact closure and release mechanism produces electromagnetic force, contact closure and release mechanism become off-state by closure state, the phase line L1 of the end of cutting off the electricity supply, zero line N1, the phase line L2 of ground wire G1 and load end, zero line N2, the connection of ground wire G2.
Embodiment two
A kind of earth leakage protective device as shown in Figure 3; comprise phase line L1, zero line N1, ground wire G1, phase line L2, zero line N2, ground wire G2, zero sequence current mutual inductor, hookup, contact closure and release mechanism, drive circuit; be connected with the residual current that detects phase line L1 and zero line N1 and the testing circuit that detects the voltage on the ground wire G1 between phase line L1, zero line N1 and the ground wire G1, the output loop of testing circuit passes zero sequence current mutual inductor.
Described testing circuit is by resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, capacitor C 3, diode D2, voltage stabilizing didoe ZD1, LED 2 and operational amplification circuit U1 form, one end of resistance R 6 connects ground wire G1, the in-phase input end of the other end concatenation operation amplifying circuit U1 of resistance R 6, one end of resistance R 5 connects phase line L1, the other end of resistance R 5 connects the anode of diode D2, the positive source of the negative electrode concatenation operation amplifying circuit U1 of diode D2, one end of resistance R 8, the anode of capacitor C 3, one end of resistance R 9 and the negative electrode of voltage stabilizing didoe ZD1, the negative electrode of capacitor C 3 connects zero line N1, the anode of voltage stabilizing didoe ZD1, one end of the power cathode of operational amplification circuit U1 and resistance R 10, the other end of resistance R 9 connects the other end of resistance R 10 and the inverting input of operational amplification circuit U1, the output of one end concatenation operation amplifying circuit U1 of resistance R 7 and the other end of resistance R 8, the other end of resistance R 7 connects the anode of LED 2, and the negative electrode of LED 2 passes the power cathode of zero sequence current mutual inductor concatenation operation amplifying circuit U1.
Phase line L2 and zero line N2 pass zero sequence current mutual inductor, one end of the solenoid in contact closure and the release mechanism is connected phase line L2, the other end of the solenoid in contact closure and the release mechanism is connected the anode of diode D1, described drive circuit is by diode D1, resistance R 1, resistance R 3, capacitor C 1, capacitor C 2 and controllable silicon SCR are formed, the negative electrode of diode D1 connects the anode of controllable silicon SCR, the negative electrode of controllable silicon SCR connects zero line N2, one end of capacitor C 2 and an end of resistance R 3, the trigger electrode of controllable silicon SCR connects the other end of capacitor C 2 and the other end of resistance R 3, the be connected in parallel two ends of resistance R 3 of two secondary output ends of zero sequence current mutual inductor.
When the reset key of earth leakage protective device is pressed, the phase line L1 of power end, zero line N1 and ground wire G1 connect phase line L2, zero line N2 and the ground wire G2 of load end respectively, and the voltage of the zero line N1 of power end and ground wire G1 is zero during normal condition, has only phase line L1 charged.Phase line L1 and zero line N1 provide power supply for testing circuit, the two ends of voltage stabilizing didoe ZD1 provide power supply for operational amplification circuit U1, resistance R 9 and resistance R 10 provide the relatively reference voltage of usefulness for operational amplification circuit U1, ground wire G1 is connected to the in-phase input end of operational amplification circuit U1 by resistance R 6, operational amplification circuit U1 is by judging output low level or high level to the voltage of ground wire G1 and the contrast of reference voltage.
When the voltage of ground wire G1 and G2 is zero, or it is with voltage and do not reach when setting threshold values (as: 24V), the output of operational amplification circuit U1 still keeps low level, LED 2 not conductings (being that indicator light does not work), there are not enough electric currents by the endoporus of zero sequence current mutual inductor, zero sequence current mutual inductor does not have enough triggering signal output yet, controllable silicon SCR is not received triggering signal, keep cut-off state, drive circuit does not drive the solenoid in contact closure and the release mechanism, and contact closure and release mechanism still remain closed.
Non-vanishing and institute is with voltage when setting threshold values (as: 24V) when the voltage of ground wire G1 and G2, or ground wire virtual connection and when causing no ground connection, the output of operational amplification circuit U1 then transfers high level to, LED 2 conductings (are that indicator light is lighted, prompting user ground wire electrification), the electric current of conducting is by the endoporus of zero sequence current mutual inductor, zero sequence current mutual inductor output triggering signal, controllable silicon SCR is received triggering signal and conducting, the solenoid that drives in contact closure and the release mechanism produces electromagnetic force, contact closure and release mechanism become off-state by closure state, the phase line L1 of the end of cutting off the electricity supply, zero line N1, the phase line L2 of ground wire G1 and load end, zero line N2, the connection of ground wire G2.
Phase line L2 when load end; consuming device on the zero line N2 breaks down when electric leakage causes ground wire G1 with the ground protection system exception and the G2 accident is charged takes place simultaneously; the vector that passes through electric current of the residual current of phase line L2 and zero line N2 and LED 2 and non-vanishing and greater than setting the induction operating value; zero sequence current mutual inductor output triggering signal; controllable silicon SCR is received triggering signal and conducting; the solenoid that drives contact closure and release mechanism produces electromagnetic force; contact closure and release mechanism become off-state by closure state, the phase line L1 of the end of cutting off the electricity supply; zero line N1; the phase line L2 of ground wire G1 and load end; zero line N2; the connection of ground wire G2.
When the zero utmost point of power supply power supply base connects instead with the utmost point mutually, when namely the zero line N1 of power end and phase line L1 were by reversal connection, zero line N1 was charged, and phase line L1 and ground wire G1 are no-voltage.Testing circuit is in the negative half period work of sinusoidal alternating current, the voltage of ground wire G1 is higher than the reference voltage of operational amplification circuit U1 at this moment, operational amplification circuit U1 output is high level, LED 2 conductings (are that indicator light is lighted, prompting user power end zero connects instead mutually), the electric current of conducting is by the endoporus of zero sequence current mutual inductor, zero sequence current mutual inductor output triggering signal, controllable silicon SCR is received triggering signal and conducting, the solenoid that drives contact closure and release mechanism produces electromagnetic force, contact closure and release mechanism become off-state by closure state, the phase line L1 of the end of cutting off the electricity supply, zero line N1, the phase line L2 of ground wire G1 and load end, zero line N2, the connection of ground wire G2.
In sum, above-mentioned execution mode is not to be restricted execution mode of the present utility model, and the modification that all those skilled in the art carry out on the basis of flesh and blood of the present utility model or equivalent deformation are all at technology category of the present utility model.
Claims (5)
1. earth leakage protective device; comprise phase line L1, zero line N1, ground wire G1, phase line L2, zero line N2, ground wire G2, zero sequence current mutual inductor, hookup, contact closure and release mechanism, drive circuit; it is characterized in that: be connected with the residual current that detects phase line L1 and zero line N1 and the testing circuit that detects the voltage on the ground wire G1 between phase line L1, zero line N1 and the ground wire G1, the output loop of described testing circuit passes zero sequence current mutual inductor.
2. earth leakage protective device according to claim 1; it is characterized in that: described testing circuit is by resistance R 5; resistance R 6; resistance R 7; capacitor C 3; diode D2; diode D3; voltage stabilizing didoe ZD1; voltage stabilizing didoe ZD2; LED 2 and operational amplification circuit U1 form; one end of resistance R 6 connects ground wire G1; the other end of resistance R 6 connects the anode of diode D3; the inverting input of diode D3 negative electrode concatenation operation amplifying circuit U1; one end of resistance R 5 connects phase line L1; the other end of resistance R 5 connects the anode of diode D2; the in-phase input end of the negative electrode concatenation operation amplifying circuit U1 of diode D2; the positive source of operational amplification circuit U1; one end of resistance R 7; the anode of the negative electrode of voltage stabilizing didoe ZD1 and capacitor C 3; the negative electrode of capacitor C 3 connects the anode of zero line N1 and voltage stabilizing didoe ZD2; the anode of voltage stabilizing didoe ZD1 connects the negative electrode of voltage stabilizing didoe ZD2 and the power cathode of operational amplification circuit U1; the other end of resistance R 7 connects the anode of LED 2, the output of the negative electrode concatenation operation amplifying circuit U1 of LED 2.
3. earth leakage protective device according to claim 1; it is characterized in that: described testing circuit is by resistance R 5; resistance R 6; resistance R 7; resistance R 8; resistance R 9; resistance R 10; capacitor C 3; diode D2; voltage stabilizing didoe ZD1; LED 2 and operational amplification circuit U1 form; one end of resistance R 6 connects ground wire G1; the in-phase input end of the other end concatenation operation amplifying circuit U1 of resistance R 6; one end of resistance R 5 connects phase line L1; the other end of resistance R 5 connects the anode of diode D2; the positive source of the negative electrode concatenation operation amplifying circuit U1 of diode D2; one end of resistance R 8; the anode of capacitor C 3; one end of resistance R 9 and the negative electrode of voltage stabilizing didoe ZD1; the negative electrode of capacitor C 3 connects zero line N1; the anode of voltage stabilizing didoe ZD1; the power cathode of operational amplification circuit U1; one end of resistance R 10 and the negative electrode of LED 2; the other end of resistance R 9 connects the other end of resistance R 10 and the inverting input of operational amplification circuit U1; the output of one end concatenation operation amplifying circuit U1 of resistance R 7 and the other end of resistance R 8, the other end of resistance R 7 connects the anode of LED 2.
4. earth leakage protective device according to claim 2, it is characterized in that: the circuit of the output of the negative electrode concatenation operation amplifying circuit U1 of the LED 2 in the described testing circuit will pass zero sequence current mutual inductor.
5. earth leakage protective device according to claim 3, it is characterized in that: the circuit of the power cathode of the negative electrode concatenation operation amplifying circuit U1 of the LED 2 in the described testing circuit will pass zero sequence current mutual inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220576232 CN203180491U (en) | 2012-11-02 | 2012-11-02 | Electric leakage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220576232 CN203180491U (en) | 2012-11-02 | 2012-11-02 | Electric leakage protection device |
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| Publication Number | Publication Date |
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| CN203180491U true CN203180491U (en) | 2013-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220576232 Expired - Fee Related CN203180491U (en) | 2012-11-02 | 2012-11-02 | Electric leakage protection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896196A (en) * | 2016-05-09 | 2016-08-24 | 佛山市顺德区信辉达电子有限公司 | Intelligent electric leakage protection plug |
| CN112485501A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Distribution transformer earth connection alarm device |
-
2012
- 2012-11-02 CN CN 201220576232 patent/CN203180491U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896196A (en) * | 2016-05-09 | 2016-08-24 | 佛山市顺德区信辉达电子有限公司 | Intelligent electric leakage protection plug |
| CN105896196B (en) * | 2016-05-09 | 2018-05-01 | 佛山市顺德区信辉达电子有限公司 | Intelligent leakage protecting plug |
| CN112485501A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Distribution transformer earth connection alarm device |
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Granted publication date: 20130904 Termination date: 20181102 |