CN105826897A - Residual current circuit breaker and residual current circuit breaking method - Google Patents
Residual current circuit breaker and residual current circuit breaking method Download PDFInfo
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- CN105826897A CN105826897A CN201610338129.2A CN201610338129A CN105826897A CN 105826897 A CN105826897 A CN 105826897A CN 201610338129 A CN201610338129 A CN 201610338129A CN 105826897 A CN105826897 A CN 105826897A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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Abstract
The invention relates to a residual current circuit breaker and a residual current circuit breaking method. The residual current circuit breaker comprises a zero sequence current transformer which is connected with an alternating-current circuit and is used for sensing leakage and generating a leakage detection signal, an amplitude limiting unit which is connected with the zero sequence current transformer and is used for limiting the voltage amplitude of the leakage detection signal according to an amplitude threshold of voltage, an anti-interference unit which is connected with the amplitude limiting unit and is used for filtering out interference in the leakage detection signal after voltage amplitude limiting, a leakage judging unit which is connected with the anti-interference unit and is used for judging whether there is leakage based on the filtered leakage detection signal and generating a control signal when that there is leakage in the alternating-current circuit is determined, a switching unit which is connected with the leakage judging unit and is used for closing the circuit according to the control signal and generating a trigger signal, and a tripping unit which is connected with the switching unit and is used for breaking the alternating-current circuit according to the trigger signal. Compared with the prior art, the residual current circuit breaker and the residual current circuit breaking method have the advantages of stable operation, precise leakage detection, and quick response.
Description
Technical field
The present invention relates to breaker technical field, particularly to a kind of RCCB and method.
Background technology
The misoperation that the RCCB of prior art there is problems in that 1, produces because of thunder and lightning；2, misoperation is produced because of transmitting set；Multiple misoperation when 3, installing near high-voltage line；4, produce because of electrostatic, product misoperation；5, multiple product misoperation during electric welding machine load；6, the product misoperation that power supply voltage variation brings；7, during 3KA dash current, chip can burn out, and problems has a strong impact on stability and the accuracy of RCCB, it is therefore necessary to solve these problems.
Summary of the invention
The technical problem to be solved be to provide a kind of stable, detection of electrical leakage accurate, and reacts quick RCCB and method.
The technical scheme is that a kind of RCCB, including:
Zero sequence current mutual inductor, it is connected with alternating current circuit, is used for sensing electric leakage situation, generates detection of electrical leakage signal；
Clipping unit, it is connected with zero sequence current mutual inductor, for detection of electrical leakage signal being carried out voltage amplitude limit according to the amplitude threshold of voltage；
Anti-interference unit, it is connected with clipping unit, filters for the detection of electrical leakage signal after voltage amplitude limit carries out interference；
Electric leakage judgement unit, it is connected with anti-interference unit, differentiates for the detection of electrical leakage signal after filtering is carried out electric leakage, when determining that alternating current circuit is leaked electricity, generates control signal；
Switch element, it is connected with electric leakage judgement unit, for carrying out Guan Bi conducting according to control signal, generates and triggers signal；
Trip unit, it is connected with switch element, for alternating current circuit being carried out open circuit according to triggering signal.
The invention has the beneficial effects as follows: by zero sequence current mutual inductor, clipping unit, anti-interference unit, electric leakage judgement unit, switch element and the coordinate operation of trip unit, can realize the electric leakage situation in alternating current circuit is sensed, and the voltage amplitude limit and interference to induced signal filters, promote the accuracy that electric leakage is differentiated by electric leakage judgement unit, when the judgement unit that leaks electricity differentiates electric leakage, control switch element to turn on, produce exciting current, trip unit induced excitation electric current, carries out open circuit to alternating current circuit；Improve the stability of this device and the accuracy of detection of electrical leakage, and reaction is quickly.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described clipping unit includes diode D1, diode D2 and resistance R1, and the negative pole of described diode D1 and positive pole are connected with two outfans of zero sequence current mutual inductor respectively；The negative pole of described diode D2 is connected with the positive pole of described diode D1, and its positive pole is connected with the negative pole of described diode D1；Described resistance R1 is in parallel with described diode D1.
Above-mentioned further scheme is used to provide the benefit that: can effectively realize the amplitude of detection signal is defined by diode D1, diode D2 and resistance R1, the high pressure effectively filtered or low pressure detection signal, promote the accuracy of detection signal.
Further, described anti-interference unit includes that resistance R2, resistance R3 and electric capacity C1, one end of described resistance R2 are connected with the negative pole of diode D2, and the other end is connected with one end of electric capacity C1；One end of described resistance R3 is connected with the positive pole of diode D2, and the other end is connected with the other end of electric capacity C1.
Use above-mentioned further scheme to provide the benefit that: can realize the low current signal such as electrostatic and wireless signal is filtered by resistance R2, resistance R3 and electric capacity C1, promote the accuracy of detection signal.
Further, described electric leakage judgement unit includes processor U1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and resistance RD, and first port of described processor U1 and the second port two ends with described electric capacity C1 respectively are connected；3rd port of described processor U1 is common port；After 4th port of described processor U1 and fifth port connection, the 3rd port through electric capacity C2 with described processor U1 is connected；7th port of described processor U1 is connected through the 3rd port of electric capacity C4 with described processor U1；6th port of described processor U1 is connected through the 3rd port of electric capacity C3 and electric capacity C4 with described processor U1, and the 8th port of described processor U1 is connected with described switch element through resistance RD, and the 8th port of described processor U1 is also through electric capacity C5 ground connection.
Use above-mentioned further scheme to provide the benefit that: can effectively realize the accurate differentiation to detection by electric leakage judgement unit, control switch element in time and operate, be swift in response.
Further, described switch element includes one-way SCR Q2, the pole that controls of described one-way SCR Q2 is connected with the 7th port of described processor U1, and the anode of described one-way SCR Q2 is connected with resistance RD, and the negative electrode of described one-way SCR Q2 is connected with the 3rd port of described processor U1.
Using above-mentioned further scheme to provide the benefit that: to make short circuit by one-way SCR Q2, thus form exciting current, trigger trip unit tripping operation, response speed is fast, safety and stability.
Further, also include that rectification unit, described rectification unit are connected with described switch element and trip unit respectively, for the alternating current that alternating current circuit inputs is carried out rectification, power to described electric leakage judgement unit and switch element.
Further, described rectification unit includes rectifier bridge, and the first input end of described rectifier bridge and the second input are connected with two outfans of described trip unit respectively；First outfan of described rectifier bridge is connected with the negative electrode of described one-way SCR Q2, and the second outfan of described rectifier bridge is connected with the anode of described one-way SCR Q2.
Use above-mentioned further scheme to provide the benefit that: rectifier bridge can effectively achieve a butt joint into alternating current carry out rectification, thus provide DC current for electric leakage judgement unit and switch element, it is achieved this device the most effectively runs.
Further, described trip unit includes varistor RV1, varistor RV2, inductance L1 and opening and closing contact K, the two ends of described varistor RV1 are connected with live wire and the zero line of alternating current circuit respectively, and one end of described inductance L1 is connected one end of live wire and connects with described varistor RV1；The other end is connected with the first input end of rectification module, and one end of described varistor RV2 the 3rd input with zero line and described rectifier bridge respectively is connected, and other end first input end with inductance L1 and described rectifier bridge respectively is connected；Described opening and closing contact K is connected in alternating current circuit, and described inductance L1 is connected with described opening and closing contact K.
Use above-mentioned further scheme to provide the benefit that: varistor RV1 and varistor RV2 can prevent the misoperation produced because of thunder and lightning, can effectively promote the stability of this device；Triggering opening and closing contact K by inductance L1 to turn off, control efficiency is high.
Another technical scheme that the present invention solves above-mentioned technical problem is as follows: a kind of leakage, breaking method, comprises the following steps:
Step S1. zero sequence current mutual inductor sensing electric leakage situation, generates detection of electrical leakage signal；
Step S2. clipping unit carries out voltage amplitude limit according to the amplitude threshold of voltage to detection of electrical leakage signal；
The anti-interference unit of step S3. carries out interference and filters the detection of electrical leakage signal after voltage amplitude limit；
Step S4. electric leakage judgement unit carries out electric leakage to the detection of electrical leakage signal after filtering and differentiates, when determining that alternating current circuit is leaked electricity, generates control signal；
Step S5. switch element carries out Guan Bi conducting according to control signal, generates and triggers signal；
Step S6. trip unit carries out open circuit according to triggering signal to alternating current circuit.
The invention has the beneficial effects as follows: by zero sequence current mutual inductor, clipping unit, anti-interference unit, electric leakage judgement unit, switch element and the coordinate operation of trip unit, can realize the electric leakage situation in alternating current circuit is sensed, and the voltage amplitude limit and interference to induced signal filters, promote the accuracy that electric leakage is differentiated by electric leakage judgement unit, when the judgement unit that leaks electricity differentiates electric leakage, control switch element to turn on, produce exciting current, trip unit induced excitation electric current, carries out open circuit to alternating current circuit；Improve the stability of this device and the accuracy of detection of electrical leakage, and reaction is quickly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of RCCB of the present invention；
Fig. 2 is the line schematic diagram of a kind of RCCB of the present invention；
Fig. 3 is the flow chart of the present invention a kind of leakage, breaking method.
In accompanying drawing, the list of parts representated by each label is as follows:
1, zero sequence current mutual inductor, 2, clipping unit, 3, anti-interference unit, 4, electric leakage judgement unit, 5, switch element, 6, trip unit, 7, rectification unit.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining the present invention, is not intended to limit the scope of the present invention.
As it is shown in figure 1, a kind of RCCB, including:
Zero sequence current mutual inductor 1, it is connected with alternating current circuit, is used for sensing electric leakage situation, generates detection of electrical leakage signal；
Clipping unit 2, it is connected with zero sequence current mutual inductor 1, for detection of electrical leakage signal being carried out voltage amplitude limit according to the amplitude threshold of voltage；
Anti-interference unit 3, it is connected with clipping unit 2, filters for the detection of electrical leakage signal after voltage amplitude limit carries out interference；
Electric leakage judgement unit 4, it is connected with anti-interference unit 3, differentiates for the detection of electrical leakage signal after filtering is carried out electric leakage, when determining that alternating current circuit is leaked electricity, generates control signal；
Switch element 5, it is connected with electric leakage judgement unit 4, for carrying out Guan Bi conducting according to control signal, generates and triggers signal；
Trip unit 6, it is connected with switch element 5, for alternating current circuit being carried out open circuit according to triggering signal.
By zero sequence current mutual inductor, clipping unit, anti-interference unit, electric leakage judgement unit, switch element and the coordinate operation of trip unit, can realize the electric leakage situation in alternating current circuit is sensed, and the voltage amplitude limit and interference to induced signal filters, promote the accuracy that electric leakage is differentiated by electric leakage judgement unit, when the judgement unit that leaks electricity differentiates electric leakage, control switch element and turn on, produce exciting current, trip unit induced excitation electric current, carries out open circuit to alternating current circuit；Improve the stability of this device and the accuracy of detection of electrical leakage, and reaction is quickly.
Preferably, described clipping unit 2 includes diode D1, diode D2 and resistance R1, and the negative pole of described diode D1 and positive pole are connected with two outfans of zero sequence current mutual inductor 1 respectively；The negative pole of described diode D2 is connected with the positive pole of described diode D1, and its positive pole is connected with the negative pole of described diode D1；Described resistance R1 is in parallel with described diode D1；Can effectively realize the amplitude of detection signal is defined by diode D1, diode D2 and resistance R1, the high pressure effectively filtered or low pressure detection signal, promote the accuracy of detection signal.
Preferably, described anti-interference unit 3 includes that resistance R2, resistance R3 and electric capacity C1, one end of described resistance R2 are connected with the negative pole of diode D2, and the other end is connected with one end of electric capacity C1；One end of described resistance R3 is connected with the positive pole of diode D2, and the other end is connected with the other end of electric capacity C1；Can realize the low current signal such as electrostatic and wireless signal is filtered by resistance R2, resistance R3 and electric capacity C1, promote the accuracy of detection signal.
Preferably, described electric leakage judgement unit 4 includes processor U1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and resistance RD, and first port of described processor U1 and the second port two ends with described electric capacity C1 respectively are connected；3rd port of described processor U1 is common port；After 4th port of described processor U1 and fifth port connection, the 3rd port through electric capacity C2 with described processor U1 is connected；7th port of described processor U1 is connected through the 3rd port of electric capacity C4 with described processor U1；6th port of described processor U1 is connected through the 3rd port of electric capacity C3 and electric capacity C4 with described processor U1, and the 8th port of described processor U1 is connected with described switch element 5 through resistance RD, and the 8th port of described processor U1 is also through electric capacity C5 ground connection；Can effectively realize the accurate differentiation to detection by electric leakage judgement unit 4, control switch element in time and operate, be swift in response.
Preferably, described switch element 5 includes one-way SCR Q2, the pole that controls of described one-way SCR Q2 is connected with the 7th port of described processor U1, and the anode of described one-way SCR Q2 is connected with resistance RD, and the negative electrode of described one-way SCR Q2 is connected with the 3rd port of described processor U1；Making short circuit by one-way SCR Q2, thus form exciting current, trigger trip unit tripping operation, response speed is fast, safety and stability.
Preferably, also include that rectification unit 7, described rectification unit 7 are connected with described switch element 5 and trip unit 6 respectively, for the alternating current that alternating current circuit inputs is carried out rectification, power to described electric leakage judgement unit 4 and switch element 5.
Preferably, described rectification unit 7 includes rectifier bridge, and the first input end of described rectifier bridge and the second input are connected with two outfans of described trip unit 6 respectively；First outfan of described rectifier bridge is connected with the negative electrode of described one-way SCR Q2, and the second outfan of described rectifier bridge is connected with the anode of described one-way SCR Q2；Rectifier bridge can effectively achieve a butt joint into alternating current carry out rectification, thus provide DC current for electric leakage judgement unit and switch element, it is achieved this device the most effectively runs.
Preferably, described trip unit 6 includes varistor RV1, varistor RV2, inductance L1 and opening and closing contact K, the two ends of described varistor RV1 are connected with live wire and the zero line of alternating current circuit respectively, and one end of described inductance L1 is connected one end of live wire and connects with described varistor RV1；The other end is connected with the first input end of rectification module, and one end of described varistor RV2 the 3rd input with zero line and described rectifier bridge respectively is connected, and other end first input end with inductance L1 and described rectifier bridge respectively is connected；Described opening and closing contact K is connected in alternating current circuit, and described inductance L1 is connected with described opening and closing contact K；Varistor RV1 and varistor RV2 can prevent the misoperation produced because of thunder and lightning, can effectively promote the stability of this device；Triggering opening and closing contact K by inductance L1 to turn off, control efficiency is high.
Implement this device, as in figure 2 it is shown, by zero sequence current mutual inductor 1, clipping unit 2, anti-interference unit 3, electric leakage judgement unit 4, switch element 5 and rectification unit 7 by epoxy resin encapsulated, obtain packaging body；The opening and closing contact K of trip unit 6 is connected in alternating current circuit, and between zero sequence current mutual inductor 1 split closed contact K and the load in packaging body, alternating current circuit senses；
Zero sequence current mutual inductor 1 senses electric leakage situation, generates detection of electrical leakage signal；Clipping unit 2 carries out voltage amplitude limit according to the amplitude threshold of voltage to detection of electrical leakage signal；Anti-interference unit 3 carries out interference and filters the detection of electrical leakage signal after voltage amplitude limit；Electric leakage judgement unit 4 carries out electric leakage to the detection of electrical leakage signal after filtering and differentiates, when determining that alternating current circuit is leaked electricity, generates control signal；Switch element 5 carries out Guan Bi conducting according to control signal, generates and triggers signal；Trip unit 6 carries out open circuit according to triggering signal to alternating current circuit.
By zero sequence current mutual inductor 1, clipping unit 2, anti-interference unit 3, electric leakage judgement unit 4, switch element 5 and the coordinate operation of trip unit 6, can realize the electric leakage situation in alternating current circuit is sensed, and the voltage amplitude limit and interference to induced signal filters, promote the accuracy that electric leakage is differentiated by electric leakage judgement unit 4, when the judgement unit 4 that leaks electricity differentiates electric leakage, control switch element 5 and turn on, produce exciting current, trip unit 6 induced excitation electric current, carries out open circuit to alternating current circuit；Improve the stability of this device and the accuracy of detection of electrical leakage, and reaction is quickly.
As it is shown on figure 3, a kind of leakage, breaking method, comprise the following steps:
Step S1. zero sequence current mutual inductor sense 1 should be leaked electricity situation, generates detection of electrical leakage signal；
Step S2. clipping unit 2 carries out voltage amplitude limit according to the amplitude threshold of voltage to detection of electrical leakage signal；
The anti-interference unit of step S3. 3 carries out interference and filters the detection of electrical leakage signal after voltage amplitude limit；
Step S4. electric leakage judgement unit 4 carries out electric leakage to the detection of electrical leakage signal after filtering and differentiates, when determining that alternating current circuit is leaked electricity, generates control signal；
Step S5. switch element 5 carries out Guan Bi conducting according to control signal, generates and triggers signal；
Step S6. trip unit 6 carries out open circuit according to triggering signal to alternating current circuit.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (9)
1. a RCCB, it is characterised in that including:
Zero sequence current mutual inductor (1), it is connected with alternating current circuit, is used for sensing electric leakage situation, generates detection of electrical leakage signal；
Clipping unit (2), it is connected with zero sequence current mutual inductor (1), for detection of electrical leakage signal being carried out voltage amplitude limit according to the amplitude threshold of voltage；
Anti-interference unit (3), it is connected with clipping unit (2), filters for the detection of electrical leakage signal after voltage amplitude limit carries out interference；
Electric leakage judgement unit (4), it is connected with anti-interference unit (3), differentiates for the detection of electrical leakage signal after filtering is carried out electric leakage, when determining that alternating current circuit is leaked electricity, generates control signal；
Switch element (5), it is connected with electric leakage judgement unit (4), for carrying out Guan Bi conducting according to control signal, generates and triggers signal；
Trip unit (6), it is connected with switch element (5), for alternating current circuit being carried out open circuit according to triggering signal.
A kind of RCCB, it is characterized in that, described clipping unit (2) includes diode D1, diode D2 and resistance R1, and the negative pole of described diode D1 and positive pole are connected with two outfans of zero sequence current mutual inductor (1) respectively；The negative pole of described diode D2 is connected with the positive pole of described diode D1, and its positive pole is connected with the negative pole of described diode D1；Described resistance R1 is in parallel with described diode D1.
A kind of RCCB, it is characterized in that: described anti-interference unit (3) includes resistance R2, resistance R3 and electric capacity C1, one end of described resistance R2 is connected with the negative pole of diode D2, and the other end is connected with one end of electric capacity C1；One end of described resistance R3 is connected with the positive pole of diode D2, and the other end is connected with the other end of electric capacity C1.
A kind of RCCB, it is characterized in that, described electric leakage judgement unit (4) includes processor U1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and resistance RD, and first port of described processor U1 and the second port two ends with described electric capacity C1 respectively are connected；3rd port of described processor U1 is common port；After 4th port of described processor U1 and fifth port connection, the 3rd port through electric capacity C2 with described processor U1 is connected；7th port of described processor U1 is connected through the 3rd port of electric capacity C4 with described processor U1；6th port of described processor U1 is connected through the 3rd port of electric capacity C3 and electric capacity C4 with described processor U1,8th port of described processor U1 is connected with described switch element (5) through resistance RD, and the 8th port of described processor U1 is also through electric capacity C5 ground connection.
A kind of RCCB, it is characterized in that, described switch element (5) includes one-way SCR Q2, the pole that controls of described one-way SCR Q2 is connected with the 7th port of described processor U1, the anode of described one-way SCR Q2 is connected with resistance RD, and the negative electrode of described one-way SCR Q2 is connected with the 3rd port of described processor U1.
A kind of RCCB, it is characterized in that, also include rectification unit (7), described rectification unit (7) is connected with described switch element (5) and trip unit (6) respectively, alternating current for alternating current circuit being inputted carries out rectification, powers to described electric leakage judgement unit (4) and switch element (5).
A kind of RCCB, it is characterized in that, described rectification unit (7) includes rectifier bridge, and the first input end of described rectifier bridge and the second input are connected with two outfans of described trip unit (6) respectively；First outfan of described rectifier bridge is connected with the negative electrode of described one-way SCR Q2, and the second outfan of described rectifier bridge is connected with the anode of described one-way SCR Q2.
A kind of RCCB, it is characterized in that, described trip unit (6) includes varistor RV1, varistor RV2, inductance L1 and opening and closing contact K, the two ends of described varistor RV1 are connected with live wire and the zero line of alternating current circuit respectively, and one end of described inductance L1 is connected one end of live wire and connects with described varistor RV1；The other end is connected with the first input end of rectification module, and one end of described varistor RV2 the 3rd input with zero line and described rectifier bridge respectively is connected, and other end first input end with inductance L1 and described rectifier bridge respectively is connected；Described opening and closing contact K is connected in alternating current circuit, and described inductance L1 is connected with described opening and closing contact K.
9. a leakage, breaking method, it is characterised in that comprise the following steps:
Step S1. zero sequence current mutual inductor sensing electric leakage situation, generates detection of electrical leakage signal；
Step S2. clipping unit carries out voltage amplitude limit according to the amplitude threshold of voltage to detection of electrical leakage signal；
The anti-interference unit of step S3. carries out interference and filters the detection of electrical leakage signal after voltage amplitude limit；
Step S4. electric leakage judgement unit carries out electric leakage to the detection of electrical leakage signal after filtering and differentiates, when determining that alternating current circuit is leaked electricity, generates control signal；
Step S5. switch element carries out Guan Bi conducting according to control signal, generates and triggers signal；
Step S6. trip unit carries out open circuit according to triggering signal to alternating current circuit.
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| CN201610338129.2A CN105826897A (en) | 2016-05-19 | 2016-05-19 | Residual current circuit breaker and residual current circuit breaking method |
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| CN201610338129.2A CN105826897A (en) | 2016-05-19 | 2016-05-19 | Residual current circuit breaker and residual current circuit breaking method |
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| CN202696113U (en) * | 2012-08-02 | 2013-01-23 | 浙江加西亚电子电器有限公司 | A type electronic leakage circuit breaker with grounding function |
| CN104377647A (en) * | 2014-11-27 | 2015-02-25 | 德力西电气有限公司 | Electric leakage protection circuit |
| CN204967236U (en) * | 2015-10-15 | 2016-01-13 | 浙江天正电气股份有限公司 | Leakage protector |
| CN204992530U (en) * | 2015-10-19 | 2016-01-20 | 德力西电气有限公司 | Three -phase leakage protection circuit |
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2016
- 2016-05-19 CN CN201610338129.2A patent/CN105826897A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202696113U (en) * | 2012-08-02 | 2013-01-23 | 浙江加西亚电子电器有限公司 | A type electronic leakage circuit breaker with grounding function |
| CN104377647A (en) * | 2014-11-27 | 2015-02-25 | 德力西电气有限公司 | Electric leakage protection circuit |
| CN204967236U (en) * | 2015-10-15 | 2016-01-13 | 浙江天正电气股份有限公司 | Leakage protector |
| CN204992530U (en) * | 2015-10-19 | 2016-01-20 | 德力西电气有限公司 | Three -phase leakage protection circuit |
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Application publication date: 20160803 |