CN204131087U - Earth leakage protective device - Google Patents
Earth leakage protective device Download PDFInfo
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- CN204131087U CN204131087U CN201420421739.5U CN201420421739U CN204131087U CN 204131087 U CN204131087 U CN 204131087U CN 201420421739 U CN201420421739 U CN 201420421739U CN 204131087 U CN204131087 U CN 204131087U
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- resistance
- earth leakage
- leakage protective
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- instrument transformer
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Abstract
The utility model discloses a kind of earth leakage protective device, comprise phase line, zero line, ground wire, phase line, zero line, ground wire, zero sequence current mutual inductor, the first earth leakage protective chip, rectification reduction voltage circuit, hookup, contact closure and release mechanism, controllable silicon, be also provided with the second earth leakage protective chip, ground line current instrument transformer and alarm and protection circuit; On the input of ground wire and the output of zero line, access detects resistance and passes described ground line current instrument transformer; the output of ground line current instrument transformer accesses the input of the second earth leakage protective chip, and the output of the second earth leakage protective chip connects alarm and protection circuit.When grounding system break down send warning time, unless earth leakage protective device and power supply depart from completely, otherwise this warning can not disappear, and the utility model can be widely applied to the fields such as household electrical appliance.
Description
Technical field
The utility model relates to a kind of earth leakage protective device, 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 grid condition is complicated; there is potential safety hazard more; the power failures such as the appliance socket wiring of family expenses is incorrect, imperfect earth, electric wire are with low quality can cause the abnormal charged electric appliance casing that makes of ground wire charged, and user continues to make electrical appliance cause electric shock accidents because not obtaining power-off protection or prompting timely.
The existing earth leakage protective device in market load end break down electric leakage or ground wire unexpected charged time, produce between phase line, zero line on residual current or ground wire and occur that dangerous currents flows through, could trip action.Existing earth leakage protective device in use; when protection system to earth ground wire lacks (as: receptacle grounds is unsettled and no ground); no matter during the electric leakage of earth leakage protective device load end consuming device insulation fault; or when protection system to earth exception (as: phase line and earth short) causes ground wire accident charged; dangerous voltage in the exposed metal component tape that consuming device is caused in capital; but they all do not form current circuit, thus also do not produce residual current or ground wire dangerous currents.Although consuming device exposed metal parts have brought dangerous voltage, existing earth leakage protective device all can not be threaded off tripping operation in this case.
Utility model content
(1) technical problem that will solve
The purpose of this utility model will overcome above-mentioned shortcoming exactly, aims to provide a kind of earth leakage protective device.
(2) technical scheme
For achieving the above object, earth leakage protective device of the present utility model, a kind of earth leakage protective device, comprise phase line, zero line, ground wire, phase line, zero line, ground wire, zero sequence current mutual inductor, the first earth leakage protective chip, rectification reduction voltage circuit, hookup, contact closure and release mechanism, controllable silicon, be also provided with the second earth leakage protective chip, ground line current instrument transformer and alarm and protection circuit; On the input of ground wire and the output of zero line, access detects resistance and passes described ground line current instrument transformer; the output of ground line current instrument transformer accesses the input of the second earth leakage protective chip; the output of the second earth leakage protective chip connects alarm and protection circuit; when described ground line current primary winding of mutual inductor senses that ground line current passes through; ground line current transformer secondaries exports induced voltage to the second earth leakage protective chip input; described second earth leakage protective chip output produces high level, makes alarm and protection circuit turn-on.
Further, described alarm and protection circuit is by the 17 resistance, 18 resistance, 19 resistance, 20 resistance, 21 resistance, 14 electric capacity, 4th diode, triode, optocoupler and alarm lamp composition, the trigger end of triode is connected with the output of the second earth leakage protective chip, one end of resistance is connected with rectifier diode output, the other end of the 16 resistance is connected with the input of triode, the output of triode connects the positive pole of optocoupler input, described triode is for driving optocoupler, optocoupler input cathode connects the positive pole of alarm lamp, the negative pole of alarm lamp is connected to one end of the 17 resistance, the other end of the 17 resistance is connected to the second earth leakage protective chip, the output head anode of optocoupler connects one end of the 20 resistance, the negative pole of output end of optocoupler is connected to one end of the 21 resistance and the positive pole of the 4th diode, the negative pole end of the 4th diode is connected to silicon controlled trigger end, the other end of the 20 resistance is connected respectively to one end of the 18 resistance and the 19 resistance, the other end of the 21 resistance is connected the first earth leakage protective chip with the other end of the 19 resistance, the other end of the 18 resistance is connected with the first diode.
Further, an output regulating resistance in parallel of described ground line current instrument transformer.
Further, described detection resistance is resistor or electric capacity.
Further, described alarm lamp is light-emitting diode, neon lamp or loud speaker any one.
Further, the triode of described warning circuit can substitute by controllable silicon or field effect transistor.
(3) beneficial effect
Compared with prior art, the technical solution of the utility model has the following advantages: except detecting load phase equally, when having residual current between zero line, action is phase immediately, zero, outside ground wire all disconnects, a current transformer is provided with between zero line and ground wire, then signal passes to an independently detection chip, better separate with prime leakage protection circuit, make it independent operating, thus do not occur interfering with each other and the stable operation of holding circuit, at segment signal output, warning indicating circuit and actuation of an alarm circuit are the consistency reaching instruction and action of series connection, thus solve misoperation and instruction by mistake.
Accompanying drawing explanation
Fig. 1 is the module map of earth leakage protective device of the present utility model;
Fig. 2 is the circuit theory diagrams of earth leakage protective device 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 for illustration of the utility model, but are not used for limiting scope of the present utility model.
As shown in Figure 1, a kind of earth leakage protective device, comprise phase line L1, zero line N1, ground wire E1, phase line L2, zero line N2, ground wire E2, zero sequence current mutual inductor H1, the first earth leakage protective chip IC 1, rectification reduction voltage circuit 1, hookup 2, contact closure and release mechanism 3, controllable silicon SCR, be also provided with the second earth leakage protective chip IC 2, ground line current instrument transformer H2 and alarm and protection circuit, on the input of ground wire E1 and the output of zero line N1, access detects resistance 4 and passes described ground line current instrument transformer H2, the output of ground line current instrument transformer H2 accesses the input of the second earth leakage protective chip IC 2, the output of the second earth leakage protective chip IC 2 connects alarm and protection circuit, when described ground line current instrument transformer H2 primary coil senses that ground line current passes through, ground line current instrument transformer H2 secondary coil exports induced voltage to the second earth leakage protective chip IC 2 input, described second earth leakage protective chip IC 2 output produces high level, make alarm and protection circuit turn-on.
Described alarm and protection circuit is by the 17 resistance R17, 18 resistance R18, 19 resistance R19, 20 resistance R20, 21 resistance R21, 14 electric capacity C14, 4th diode D4, triode QS, optocoupler U and alarm lamp HLED forms, the trigger end of triode QS is connected with the output of the second earth leakage protective chip IC 2, one end of resistance R16 is connected with rectifier diode D2 output, the other end of the 16 resistance R16 is connected with the input of triode QS, the output of triode QS connects the positive pole of optocoupler U input, described triode QS is for driving optocoupler U, optocoupler U input cathode connects the positive pole of alarm lamp HLED, the negative pole of alarm lamp HLED is connected to one end of the 17 resistance R17, the other end of the 17 resistance R17 is connected to the second earth leakage protective chip IC 2, the output head anode of optocoupler U connects one end of the 20 resistance R20, the negative pole of output end of optocoupler U is connected to one end of the 21 resistance R21 and the positive pole of the 4th diode D4, the negative pole end of the 4th diode D4 is connected to the trigger end of controllable silicon SCR 1, the other end of the 20 resistance R20 is connected respectively to one end of the 18 resistance R18 and the 19 resistance R19, the other end of the 21 resistance R21 is connected the first earth leakage protective chip IC 1 with the other end of the 19 resistance R19, the other end of the 18 resistance R18 is connected with the first diode D1.The second earth leakage protective chip IC 2 of the present embodiment is preferably 54123 earth leakage protective devices.
An output regulating resistance R7 in parallel of described ground line current instrument transformer H2, regulating resistance R7 can change zero line N1, the tripping voltage between ground wire E.
Described detection resistance 4 can replace with resistor or electric capacity.
Described alarm lamp HLED is light-emitting diode, neon lamp or loud speaker any one.
The triode QS of described warning circuit can substitute by controllable silicon or field effect transistor.
The output of the second earth leakage protective chip IC 2 is connected with the base stage of triode QS, an electric capacity C14 in parallel between the base stage of triode QS and emitter.
When there is electric leakage between zero line and ground wire; ground line current instrument transformer H2 senses electric current; second earth leakage protective chip IC 2 is by the triode QS that sets out after this signal transacting; make optocoupler U conducting; thus trigger the trigger end of controllable silicon SCR; make controllable silicon SCR conducting, thus cause release to trip, and the drain conditions between ground wire and zero line is shown by alarm lamp HLED.
Circuit of the present invention has highly sensitive and high stable performance, except load phase can be detected equally, when having residual current between zero line, action is phase immediately, zero, outside ground wire all disconnects, a current transformer is provided with between zero line and ground wire, then signal passes to an independently detection chip, better separate with prime leakage protection circuit, make it independent operating, thus do not occur interfering with each other and the stable operation of holding circuit, at segment signal output, warning indicating circuit and actuation of an alarm circuit are the consistency reaching instruction and action of series connection, thus solve misoperation and instruction by mistake.
In sum, above-mentioned execution mode is not 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, all at technology category of the present utility model.
Claims (6)
1. an earth leakage protective device, comprise phase line (L1), zero line (N1), ground wire (E1), phase line (L2), zero line (N2), ground wire (E2), zero sequence current mutual inductor (H1), the first earth leakage protective chip (IC1), rectification reduction voltage circuit (1), hookup (2), contact closure and release mechanism (3), controllable silicon (SCR), is characterized in that: be also provided with the second earth leakage protective chip (IC2), ground line current instrument transformer (H2) and alarm and protection circuit, on the input of ground wire (E1) and the output of zero line (N1), access detects resistance (4) and passes described ground line current instrument transformer (H2), the output of ground line current instrument transformer (H2) accesses the input of the second earth leakage protective chip (IC2), the output of the second earth leakage protective chip (IC2) connects alarm and protection circuit, when described ground line current instrument transformer (H2) primary coil senses that ground line current passes through, ground line current instrument transformer (H2) secondary coil exports induced voltage to the second earth leakage protective chip (IC2) input, described second earth leakage protective chip (IC2) output produces high level, make alarm and protection circuit turn-on.
2. earth leakage protective device according to claim 1, it is characterized in that: described alarm and protection circuit is by the 17 resistance (R17), 18 resistance (R18), 19 resistance (R19), 20 resistance (R20), 21 resistance (R21), 14 electric capacity (C14), 4th diode (D4), triode (QS), optocoupler (U) and alarm lamp (HLED) composition, the trigger end of triode (QS) is connected with the output of the second earth leakage protective chip (IC2), one end of resistance (R16) is connected with rectifier diode (D2) output, the other end of the 16 resistance (R16) is connected with the input of triode (QS), the output of triode (QS) connects the positive pole of optocoupler (U) input, described triode (QS) is for driving optocoupler (U), optocoupler (U) input cathode connects the positive pole of alarm lamp (HLED), the negative pole of alarm lamp (HLED) is connected to one end of the 17 resistance (R17), the other end of the 17 resistance (R17) is connected to the second earth leakage protective chip (IC2), the output head anode of optocoupler (U) connects one end of the 20 resistance (R20), the negative pole of output end of optocoupler (U) is connected to one end of the 21 resistance (R21) and the positive pole of the 4th diode (D4), the negative pole end of the 4th diode (D4) is connected to the trigger end of controllable silicon (SCR1), the other end of the 20 resistance (R20) is connected respectively to one end of the 18 resistance (R18) and the 19 resistance (R19), the other end of the 21 resistance (R21) is connected the first earth leakage protective chip (IC1) with the other end of the 19 resistance (R19), the other end of the 18 resistance (R18) is connected with the first diode (D1).
3. earth leakage protective device according to claim 1, is characterized in that: an output regulating resistance (R7) in parallel of described ground line current instrument transformer (H2).
4. earth leakage protective device according to claim 1, is characterized in that: described detection resistance (4) is resistor or electric capacity.
5. earth leakage protective device according to claim 1 and 2, is characterized in that: described alarm lamp (HLED) is light-emitting diode, neon lamp or loud speaker any one.
6. earth leakage protective device according to claim 1 and 2, is characterized in that: the triode (QS) of described warning circuit can substitute by controllable silicon or field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420421739.5U CN204131087U (en) | 2014-07-29 | 2014-07-29 | Earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420421739.5U CN204131087U (en) | 2014-07-29 | 2014-07-29 | Earth leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131087U true CN204131087U (en) | 2015-01-28 |
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ID=52387408
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420421739.5U Expired - Fee Related CN204131087U (en) | 2014-07-29 | 2014-07-29 | Earth leakage protective device |
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| Country | Link |
|---|---|
| CN (1) | CN204131087U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880600A (en) * | 2015-05-29 | 2015-09-02 | 余姚市嘉荣电子电器有限公司 | Leakage protector ground wire electric leakage alarm lamp circuit by use of optical coupler |
| CN106950453A (en) * | 2017-05-05 | 2017-07-14 | 南京信息工程大学 | A kind of grounding safety Protective Detector |
| CN109818332A (en) * | 2019-02-19 | 2019-05-28 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device having ground wire missing protection |
-
2014
- 2014-07-29 CN CN201420421739.5U patent/CN204131087U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880600A (en) * | 2015-05-29 | 2015-09-02 | 余姚市嘉荣电子电器有限公司 | Leakage protector ground wire electric leakage alarm lamp circuit by use of optical coupler |
| CN106950453A (en) * | 2017-05-05 | 2017-07-14 | 南京信息工程大学 | A kind of grounding safety Protective Detector |
| CN106950453B (en) * | 2017-05-05 | 2023-09-12 | 南京信息工程大学 | Grounding safety protection detector |
| CN109818332A (en) * | 2019-02-19 | 2019-05-28 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device having ground wire missing protection |
| CN109818332B (en) * | 2019-02-19 | 2024-04-30 | 余姚市嘉荣电子电器有限公司 | Leakage protector with ground wire missing protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20180729 |