CN102684148A - Leakage protection device with extended function - Google Patents
Leakage protection device with extended function Download PDFInfo
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- CN102684148A CN102684148A CN201210172115XA CN201210172115A CN102684148A CN 102684148 A CN102684148 A CN 102684148A CN 201210172115X A CN201210172115X A CN 201210172115XA CN 201210172115 A CN201210172115 A CN 201210172115A CN 102684148 A CN102684148 A CN 102684148A
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Abstract
The invention discloses a leakage protection device with an extended function, belonging to the field of a low-voltage power distribution protection device. The leakage protection device comprises a zero-sequence current transformer, a release, an IC (integrated circuit) drive circuit, a test circuit and a function extension circuit; wherein the release is connected with a power grid, and a phase line, a zero line and an earth wire are led to supply electricity to a load; one end of an electromagnet coil of the release is connected with the G end of the IC drive circuit, and the other end of the electromagnet coil of the release is connected with the phase line which does not pass through the zero-sequence current transformer; one end of a secondary coil of the zero-sequence current transformer is connected with the A end of the IC drive circuit, and the other end of the secondary coil of the zero-sequence current transformer is connected with the B end of the IC drive circuit; the H end of the IC drive circuit is connected with the output end of the function extension circuit; the B end of the IC drive circuit is connected with a reference voltage input end of the function extension circuit; the K end of the test circuit is connected with the phase line which does not pass through the zero-sequence current transformer, and the input end of the function extension circuit is connected with the earth wire. The leakage protection device can provide immediate protection to abnormal electrification of the earth wire of the power grid or electrification of a housing of an electric appliance, and the temperature rise protection is achieved.
Description
Technical field
The invention belongs to low-voltage distribution protective device technical field, relate to a kind of earth leakage protective device, relate in particular to a kind of earth leakage protective device with expanded function
Background technology
since mankind's invention and making electricity consumption, electricity has not only brought a lot of convenience to the mankind, also brings a lot of extinctions to the mankind simultaneously.At present, the safety of China's power utilization environment ratio not up to standard is also very high, still has more potential safety hazard.Take place unusual chargedly etc. like the ground terminal of incorrect, the no ground connection of appliances power source wiring or imperfect earth, use socket inferior and power supply, all can cause electric appliance casing charged, thereby cause the generation of electric shock accidents.So in the following one by one while of omnifarious electrical equipment, protective device miscellaneous also has been born.Wherein having a kind of is to protect the people specially, is called earth leakage protective device, is used for when the impaired generation shorted to earth of circuit or electrical apparatus insulation, preventing that the person from getting an electric shock and the protection electrical equipment of electrical fire.Existing earth leakage protective device adopts the residual current detection technique mostly, only detects and provide protection to electrical leakage, and function is comparatively single.High potential safety hazard is crossed in the temperature rise that can't cause ground wire abnormal belt electricity, ground wire disappearance and plug and socket loose contact provides safeguard protection.
In view of above-mentioned prior art, be necessary existing earth leakage protective device is improved, for this reason, the applicant has made good try, and the technical scheme that will introduce below produces under this background
Summary of the invention
the purpose of this invention is to provide a kind of earth leakage protective device with expanded function; It is through a function expanded circuit; Can protection timely be provided to the unusual charged of electrical network ground wire or owing to the electric appliance casing that ground wire lacks, electrical equipment takes place to leak electricity to be caused is charged, can also realize the temperature rise protection through temperature protection circuit in addition.
the objective of the invention is to reach like this; A kind of earth leakage protective device with expanded function; Comprise zero sequence current mutual inductor ZCT, release, IC drive circuit, hookup and function expanded circuit; Release is held to be connected and to draw phase line, zero line and ground wire and is powered to the load with N end, L end, the PE of electrical network, and phase line and zero line pass zero sequence current mutual inductor ZCT, and the end of the electromagnet coil L1 of release is connected with the G of IC drive circuit end; The other end of electromagnet coil L1 is connected with the phase line of not passing zero sequence current mutual inductor; One end of the secondary coil of zero sequence current mutual inductor ZCT is connected with the A of IC drive circuit end, and the other end of secondary coil is connected with the B end of IC drive circuit, and the H end of IC drive circuit is connected with the output E end of function expanded circuit; The B end of IC drive circuit is connected with the reference voltage input terminal F end of function expanded circuit; The K end of hookup is connected with the phase line of not passing zero sequence current mutual inductor ZCT, and the I end of the J end of hookup, the signal common port D end of function expanded circuit and IC drive circuit connects the zero line that passes zero sequence current mutual inductor, the input C termination ground wire 1 of function expanded circuit jointly.
are in a concrete embodiment of the present invention; Described function expanded circuit comprises diode D2, resistance R 6～R8, capacitor C 6 and transistor Q2; The B end of the anodal F termination IC drive circuit of diode D2; The end of the negative pole connecting resistance R6 of diode D2 and the emitter of transistor Q2, the H end of the collector electrode E termination IC drive circuit of transistor Q2, the end of the base stage connecting resistance R7 of transistor Q2, an end of capacitor C 6 and an end of resistance R 8; The D termination of the other end of the other end of the other end of resistance R 6, resistance R 7 and capacitor C 6 is passed the zero line of zero sequence current mutual inductor ZCT, the C termination ground wire of the other end of resistance R 8.
are in another concrete embodiment of the present invention; A kind of earth leakage protective device with expanded function; Also comprise temperature protection circuit; Described temperature protection circuit comprises temperature protection switch TK1 and resistance R 9; The base stage of transistor Q2 in the termination function expanded circuit of temperature protection switch TK1, an end of resistance R 7, an end of capacitor C 6 and an end of resistance R 8, the end of the other end connecting resistance R9 of temperature protection switch TK1, another termination of resistance R 9 is passed the phase line of zero sequence current mutual inductor.
the present invention is owing to adopted said structure, and when having electric leakage to produce in the power line, release can take place to prevent electric shock accidents by the fast shut-off power supply, has played earth leakage protective effect; In addition, through the function expanded circuit, can to ground wire abnormal belt electricity detect and deenergization to play the effect of safeguard protection; Simultaneously, also temperature protection circuit can be set, circuit temperature is protected.
Description of drawings
Fig. 1 is the electrical schematic diagram of one embodiment of the invention.
Fig. 2 is the electrical schematic diagram of another embodiment of the present invention.
Embodiment
can be expressly understood technical spirit of the present invention and beneficial effect more for the auditor that the makes Patent Office especially public; The applicant general combines accompanying drawing to elaborate with the mode of embodiment below; But the description to embodiment all is not the restriction to the present invention program, any according to the present invention design done only for pro forma but not substantial equivalent transformation all should be regarded as technical scheme category of the present invention.
Embodiment 1
see also Fig. 1, and a kind of earth leakage protective device with expanded function comprises zero sequence current mutual inductor ZCT, release 4, IC drive circuit 5, hookup 6 and function expanded circuit 7.Wherein, release 4 is made up of with the K switch with three groups of contacts electromagnet coil L1; IC drive circuit 5 comprises diode D1, resistance R 1～R3, capacitor C 1～C5, thyristor SCR and integrated chip U1, and in the present invention, integrated chip U1 adopts M54123; Hookup 6 comprises push-button switch T and resistance R 5; Function expanded circuit 7 comprises diode D2, resistance R 6～R8, capacitor C 6 and transistor Q2, wherein, the also available resistance replacement of diode D2, transistor Q2 is a single transistor, but also can be Darlington.Particularly; The N end (zero line) that one end of three groups of contacts of the K switch of release 4 gets access to grid respectively, L end (phase line) and PE end (ground wire); The other end of three groups of contacts is drawn zero line 3, phase line 2 and ground wire 1 respectively and is powered to the load; Phase line 2 is passed zero sequence current mutual inductor ZCT with zero line 3; Another termination of the electromagnet coil L1 of release 4 is not passed the phase line 2 of zero sequence current mutual inductor ZCT, and the end of the electromagnet coil L1 of release 4 is connected with the G of IC drive circuit 5 end, and the positive pole of the positive pole of diode D1 and thyristor SCR is connected to the G end; The end of the negative pole connecting resistance R1 of diode D1; The positive pole of another termination electrochemical capacitor C3 of resistance R 1 and 8 pin of integrated chip U1,7 pin of integrated chip U1 connect the grid of thyristor SCR, an end of capacitor C 1 and an end of capacitor C 2,6 pin of another termination integrated chip U1 of capacitor C 2; 5 pin of integrated chip U1 are connected with an end of 4 pin and capacitor C 4; 2 pin of integrated chip U1 and an end of resistance R 3 are connected to the H end, and the end of the other end connecting resistance R2 of resistance R 3 is the A end, and 1 pin of the other end of resistance R 2, integrated chip U1, an end of capacitor C 5 are connected to the B end; 3 pin of the other end of the negative pole of the other end of the negative pole of thyristor SCR, capacitor C 1, electrochemical capacitor C3, capacitor C 4, integrated chip U1, the other end of capacitor C 5 are connected to the I end; The negative pole of diode D2 is connected with an end of resistance R 6 and the emitter of transistor Q2, the end of the base stage connecting resistance R7 of transistor Q2, an end of capacitor C 6 and an end of resistance R 8, and the end K end of the push-button switch T in the hookup 6 is connected with the phase line of not passing zero sequence current mutual inductor ZCT 2; The end of the other end connecting resistance R5 of push-button switch T; The other end J termination of resistance R 5 is passed the zero line 3 of zero sequence current mutual inductor ZCT, and the other end of the other end of resistance R 6, resistance R 7 and the other end of capacitor C 6 are connected to the D end, and the other end of resistance R 8 is the C end.
Fig. 1 please be continued to consult in
; During push-button switch T in pressing hookup 6; Flow through the leakage current of a simulation among the zero sequence current mutual inductor ZCT, its current value is by resistance R 5 decisions, and whether the creepage protection function that detects earth leakage protective device is effective.The phase line of power line 
And zero line
Pass zero sequence current mutual inductor ZCT, zero sequence current mutual inductor ZCT obtains electric leakage signal and adds to the side a and b of IC drive circuit 5 through secondary coil, and U1 handles by integrated chip.Resistance R 2 in the IC drive circuit 5 can be adjusted residual operating current, and capacitor C 1, C2, C4, C5 are filter capacitor, play anti-interference effect.When electric leakage generation (except the loop current between phase line
and zero line
) being arranged in appointing single line and reaching the setting value of circuit setting; 7 pin by integrated chip U1 drive thyristor SCR conducting; The release action; The fast shut-off power supply takes place to prevent electric shock accidents, has played earth leakage protective effect.In addition; When normal condition that the ground wire 1 of electrical network is in, the voltage between the input C of function expanded circuit 7, the signal common port D is zero, and transistor Q2 ends; Current collection is the high impedance output state very; Can not influence the operating state of the 2 pin signal input parts of integrated chip U1, this moment, integrated chip U1 only had response to the input signal of zero sequence current mutual inductor ZCT, and the electrical leakage of load end is played the safeguard protection effect.When the ground wire in the electrical network 1 takes place unusual when charged; Between ground wire 1 and zero line 3, just have abnormal voltage; Just have abnormal voltage input between the input C of function expanded circuit 7, the signal common port D, this voltage through resistance R 8, R7 step-down after the base stage of input transistors Q2, when the base of the voltage on the transistor Q2 base stage >=transistor Q2 conducting voltage+when transistor Q2 emitter connects reference voltage; Transistor Q2 conducting; The 2 pin inputs of integrated chip U1 have the signal input, and 7 pin drive thyristor SCR conducting, the release action; With comprising the whole disconnections of being electrically connected of ground wire between the electrical equipment of load end and the electrical network, played the detection of ground wire abnormal belt electricity situation and the safeguard protection effect under this situation.
Embodiment 2
see also Fig. 2; A kind of earth leakage protective device with expanded function also comprises temperature protection circuit 8; Described temperature protection circuit 8 comprises temperature protection switch TK1 and resistance R 9; The base stage of transistor Q2 in the termination function expanded circuit 7 of temperature protection switch TK1, an end of resistance R 7, an end of capacitor C 6 and an end of resistance R 8, the end of the other end connecting resistance R9 of temperature protection switch TK1, another termination of resistance R 9 is passed the phase line 2 of zero sequence current mutual inductor.When temperature reaches the operating temperature of temperature protection switch TK1, the closed conducting of temperature protection switch TK1, the voltage of phase line 2 adds to the base stage of transistor Q2 through resistance R 9; Transistor Q2 conducting; Make the 2 pin inputs of the integrated chip U1 in the IC drive circuit 5 that the signal input arranged, its 7 pin drives thyristor SCR conducting, the release action; Deenergization has played the temperature protection effect.
In sum, technical scheme provided by the invention has overcome the shortcoming in the prior art, has reached goal of the invention, has embodied the described technique effect of applicant
Claims (3)
1.
a kind of earth leakage protective device with expanded function; Comprise zero sequence current mutual inductor ZCT, release (4), IC drive circuit (5), hookup (6) and function expanded circuit (7); Release (4) is held to be connected and to draw phase line (2), zero line (3) and ground wire (1) and is powered to the load with N end, L end, the PE of electrical network; Phase line (2) and zero line (3) pass zero sequence current mutual inductor ZCT; The end of the electromagnet coil L1 of release (4) is connected with the G end of IC drive circuit (5); The other end of electromagnet coil L1 is connected with the phase line of not passing zero sequence current mutual inductor (2); One end of the secondary coil of zero sequence current mutual inductor ZCT is connected with the A end of IC drive circuit (5), and the other end of secondary coil is connected with the B end of IC drive circuit (5), and the H end of IC drive circuit (5) is connected with the output E end of function expanded circuit (7); The B end of IC drive circuit (5) is connected with the reference voltage input terminal F end of function expanded circuit (7); The K end of hookup (6) is connected with the phase line of not passing zero sequence current mutual inductor ZCT (2), and the I end of the J end of hookup (6), the signal common port D end of function expanded circuit (7) and IC drive circuit (5) connects the zero line (3) that passes zero sequence current mutual inductor, the input C termination ground wire (1) of function expanded circuit (7) jointly.
2. the earth leakage protective device of
band expanded function according to claim 1; It is characterized in that described function expanded circuit (7); Comprise diode D2, resistance R 6～R8, capacitor C 6 and transistor Q2; The B end of the anodal F termination IC drive circuit (5) of diode D2; The end of the negative pole connecting resistance R6 of diode D2 and the emitter of transistor Q2, the H end of the collector electrode E termination IC drive circuit (5) of transistor Q2, the end of the base stage connecting resistance R7 of transistor Q2, an end of capacitor C 6 and an end of resistance R 8; The D termination of the other end of the other end of the other end of resistance R 6, resistance R 7 and capacitor C 6 is passed the zero line (3) of zero sequence current mutual inductor ZCT, the C termination ground wire (1) of the other end of resistance R 8.
3.
The earth leakage protective device of band expanded function according to claim 1; It is characterized in that also comprising temperature protection circuit (8); Described temperature protection circuit (8) comprises temperature protection switch TK1 and resistance R 9; The base stage of transistor Q2 in the termination function expanded circuit (7) of temperature protection switch TK1, an end of resistance R 7, an end of capacitor C 6 and an end of resistance R 8; The end of the other end connecting resistance R9 of temperature protection switch TK1, another termination of resistance R 9 pass the phase line (2) of zero sequence current mutual inductor
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210172115.XA CN102684148B (en) | 2012-05-30 | 2012-05-30 | Leakage protection device with extended function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210172115.XA CN102684148B (en) | 2012-05-30 | 2012-05-30 | Leakage protection device with extended function |
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| CN102684148A true CN102684148A (en) | 2012-09-19 |
| CN102684148B CN102684148B (en) | 2014-06-04 |
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| CN201210172115.XA Expired - Fee Related CN102684148B (en) | 2012-05-30 | 2012-05-30 | Leakage protection device with extended function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887660A (en) * | 2014-03-31 | 2014-06-25 | 常熟市立得电器有限公司 | Earth leakage protection plug capable of being switched between three-pole mode and two-pole mode |
| CN105591357A (en) * | 2014-09-30 | 2016-05-18 | 乐清市东亚电器开关厂 | Novel multiple leakage protector control circuit |
Citations (6)
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|---|---|---|---|---|
| JP2000102158A (en) * | 1998-07-24 | 2000-04-07 | Fuji Electric Co Ltd | Earth leakage circuit breaker |
| CN2435861Y (en) * | 2000-08-22 | 2001-06-20 | 番禺旭东阪田电子有限公司 | Leakage protective plug with ultrahigh temp. protection |
| CN201138737Y (en) * | 2008-01-04 | 2008-10-22 | 章祖德 | Multifunctional leakage protecting equipment preventing earth wire to be charged and alarming |
| CN201181835Y (en) * | 2008-06-13 | 2009-01-14 | 章祖德 | Multifunctional earth-leakage protective equipment |
| CN201781263U (en) * | 2010-05-10 | 2011-03-30 | 厦门振泰成科技有限公司 | Electric-shock protection wall overcurrent leakage protection circuit of wall switch |
| CN202651752U (en) * | 2012-05-30 | 2013-01-02 | 常熟市立得电器有限公司 | Electric leakage protection device with expansion function |
-
2012
- 2012-05-30 CN CN201210172115.XA patent/CN102684148B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000102158A (en) * | 1998-07-24 | 2000-04-07 | Fuji Electric Co Ltd | Earth leakage circuit breaker |
| CN2435861Y (en) * | 2000-08-22 | 2001-06-20 | 番禺旭东阪田电子有限公司 | Leakage protective plug with ultrahigh temp. protection |
| CN201138737Y (en) * | 2008-01-04 | 2008-10-22 | 章祖德 | Multifunctional leakage protecting equipment preventing earth wire to be charged and alarming |
| CN201181835Y (en) * | 2008-06-13 | 2009-01-14 | 章祖德 | Multifunctional earth-leakage protective equipment |
| CN201781263U (en) * | 2010-05-10 | 2011-03-30 | 厦门振泰成科技有限公司 | Electric-shock protection wall overcurrent leakage protection circuit of wall switch |
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Non-Patent Citations (1)
| Title |
|---|
| 贾传圣等: "一种新颖的低压漏电保护装置", 《电气开关》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887660A (en) * | 2014-03-31 | 2014-06-25 | 常熟市立得电器有限公司 | Earth leakage protection plug capable of being switched between three-pole mode and two-pole mode |
| CN105591357A (en) * | 2014-09-30 | 2016-05-18 | 乐清市东亚电器开关厂 | Novel multiple leakage protector control circuit |
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| Publication number | Publication date |
|---|---|
| CN102684148B (en) | 2014-06-04 |
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Granted publication date: 20140604 |