CN1841074A - Fault arc detection method and protection circuit thereof - Google Patents
Fault arc detection method and protection circuit thereof Download PDFInfo
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- CN1841074A CN1841074A CN 200510033926 CN200510033926A CN1841074A CN 1841074 A CN1841074 A CN 1841074A CN 200510033926 CN200510033926 CN 200510033926 CN 200510033926 A CN200510033926 A CN 200510033926A CN 1841074 A CN1841074 A CN 1841074A
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Abstract
The invention discloses a fault arc test method and protection circuit, the method, belongs to electron current, can test the fault arc. This method comprises: sampling current signal, providing to signal processing modular, testing the result by the arc test-control apparatus; then producing the arc symbol being, sending the clear signal, and protecting the loading. The merits of the invention include effectively preventing the arc fire when the interrupting arc is produced by the electrical circuit.
Description
Technical field
The present invention relates to a kind of fault arc detection method and holding circuit thereof, particularly a kind of fault electric arc holding circuit that can detect dangerous electric arc and cut off the electricity supply automatically.
Background technology
In recent years, along with popularizing of household electrical appliance, electrical fire is in rising trend, and wherein fault electric arc (electric arc, electric spark) is the main cause that causes electrical fire.Fault electric arc can divide short circuiting arc and loose contact electric arc.
Short circuiting arc is the electric arc that is produced by the big electric current that short circuit causes between the circuit phase line, between the phase line zero line, between the phase line ground wire.Wherein short circuiting arc can be divided into sustained short-circuit electric arc, swinging short electric arc again.Sustained short-circuit electric arc causes that the characteristics of fire are that short circuiting arc can produce high temperature in moment, causes fire goods moment burning on every side; Swinging short electric arc causes that the characteristics of fire are the time weak points that swinging short electric arc continues, but can continue to produce electric arc in a period of time, causes that environment temperature continues to raise, thereby causes that fire goods burn on every side.
Loose contact electric arc is because the loosening electric arc that waits the loose contact generation that causes of the connection terminal of load equipment.Loose contact electric arc cause the characteristics of fire be the loose contact arc energy in a period of time, continue to produce electric arc, cause that environment temperature continues to raise, thereby cause fire goods burning on every side.
At present, the overcurrent of electric wiring, electric leakage, overvoltage protection can only play a protective role to sustained short-circuit electric arc, play a protective role surely and other electric arc differed.
Current existing fault electric arc protective device is primarily aimed at the fault electric arc that occurs in the power circuit, it is characterized in that the electric arc of the big electric current continuous discharge generation that moment produces.For the fault electric arc that occurs in the electric appliance circuits, the interrupted fault electric arc as loose contact, little short circuit current produce does not also have reliable protection.Therefore also there is very big defective in the protection of the electrical fire that causes for intermittent fault electric arc.
Summary of the invention
The invention provides a kind of fault arc detection method and holding circuit thereof that when interrupted arc occurring in the protected circuit, can detect dangerous electric arc and automatic shutdown circuit.When intermittent fault electric arc occurring in protected circuit, this method can in time detect electric arc and cut off the electricity supply before it causes electrical fire, thereby avoids the generation of fire or major event, reaches the protection to electrical equipment.
Realize technical scheme of the present invention:
Fault arc detection method, this method can detect dangerous electric arc by the fault electric arc holding circuit, it is characterized in that comprising step:
In real time current signal is sampled by signal sampling device, and sampled data is offered signal processing module;
Signal processing module is handled current signal, the result is passed to the arc-detection control device detect, and when the arc-detection control device detects electric arc, produces the electric arc sign.
Wherein:
The signal of described signal sampling device sampling is a current waveform;
Described signal processing module is handled current waveform;
Described arc-detection control device is judged, is detected the current waveform after handling.
The fault electric arc holding circuit comprises power unit, it is characterized in that: described fault electric arc protector also comprises signal sampling device, signal processing module, arc-detection control device and the module of cutting off the electricity supply.
Described signal sampling device is the current transformer of ribbon core; Described signal processing module has connected all-wave diode rectifier bridge, divider resistance R successively
1And R
3Described arc-detection control device is a single-chip microcomputer; The described module of cutting off the electricity supply has connected triode and topworks's part successively.
Described topworks partly is the normally closed contact relay.
Described topworks partly is the normally opened contact relay.
Described topworks partly is the electrical apparatus release that powers on.
Described topworks partly is the outage electrical apparatus release.
Described topworks partly is a controllable silicon.
Advantage of the present invention is: when using on electrical equipment, when circuit produces interrupted arc, can in time detect electric arc and cut off the electricity supply, prevent the generation of electric arc fire effectively.
Description of drawings
Fig. 1 is that topworks of the present invention partly is the circuit theory diagrams of normally closed contact relay with the electrical apparatus release that powers on.
Fig. 2 is that topworks of the present invention partly is the circuit theory diagrams of normally opened contact relay with the outage electrical apparatus release.
Fig. 3 is that topworks of the present invention partly is the ghyristor circuit schematic diagram.
Fig. 4 is the process flow diagram that single-chip microcomputer is judged, detected the current waveform of handling.
Fig. 5, Fig. 6 are the process flow diagrams that Single Chip Microcomputer (SCM) program is interrupted.
Embodiment
Embodiment 1:
As shown in Figure 1, protected circuit is by AC220V input end 8 input 220V alternating voltages, through the normally closed contact relay 9 of fault electric arc holding circuit, by 11 outputs of AC220V output terminal.Protected circuit connects this fault electric arc holding circuit, and direct supply VCC provides power supply for the fault electric arc holding circuit.Circuit just often, current transformer 2 detected waveforms are continuous load current waveform; When circuit has electric arc to produce, because the characteristic of current transformer 2 makes current transformer 2 detected current waveforms that displacement be arranged.Current transformer 2 detects the ac current signal in the protected circuit that passes it, then with detected current waveform signal by full-wave rectification bridge 3 rectifications, and by resistance R
14 and R
3Become direct current signal after 5 dividing potential drops, then this direct current signal is input to single-chip microcomputer 7, single-chip microcomputer 7 is by the AD value of sample rate current before and after comparing, and the AD value is meant that simulating signal transfers the digital signal value corresponding to, judge whether current waveform has the displacement phenomenon, thereby judged whether fault electric arc.When not detecting fault electric arc, single-chip microcomputer 7 sends low level signal, and triode 10 ends, and power supply provides operating voltage by normally closed contact relay 9 for protected electrical equipment; When having fault electric arc to produce in detecting protected circuit, single-chip microcomputer 7 sends high-level control signal, makes triode 10 conductings; the normally closed contact relay 9 that is positioned at collector this moment disconnects; realization is cut off the electricity supply, and reaches the protection to circuit, avoids the generation of electrical fire.After fault electric arc was got rid of, power supply passed through resistance R
26 again to the fault secure circuit power-on-reset, and single-chip microcomputer restarts work.
As Fig. 4, Fig. 5, shown in Figure 6, the workflow of single-chip microcomputer is as follows:
(1) single-chip microcomputer carries out electrification reset, and after single-chip microcomputer powered on, power supply VCC was through resistance R
2, single-chip microcomputer is resetted to the single-chip microcomputer pin.Arrive step 2 then;
(2) Single Chip Microcomputer (SCM) program initialization, this moment, all zone bits were 0, analog signal conversion is that digital signal value corresponding AD is AD
0, the AD signal sampling is from a pin input of single-chip microcomputer, and the AD control signal arrives step 3 then by another pin output of single-chip microcomputer;
(3) single-chip microcomputer judges whether the AD conversion is finished, and when not having new AD value to produce, AD converts and is masked as 0, and continues to judge whether that new AD value produces; When new AD value produced, AD converted and is masked as 1, and writes down new AD value AD
1, arrive step 4 then;
(4) single-chip microcomputer zero clearing AD converts sign, and compares AD
1Value and AD
0Value, the unequal step 5 that then arrive is equal then arrive step 8;
(5) single-chip microcomputer upgrades the AD value automatically, with current AD value AD
1Replace existing AD value AD
0, arrive step 6 then;
(6) single-chip microcomputer detects the electric arc sign, when electric arc is masked as 0, forwards step 14 to; When electric arc is masked as 1, to step 7;
(7) single-chip microcomputer sends the control signal of cutting off the electricity supply;
(8) single-chip microcomputer detects and finds the electric arc sign, when finding that electric arc forwards step 9 to when being masked as 0, when finding that electric arc forwards step 10 to when being masked as 1;
(9) preserve the time this moment, be designated as T1, the electric arc sign is found in set, finds that promptly electric arc is masked as 1, arrives step 10 then;
(10) single-chip microcomputer detects the electric arc sign, to step 11, forwards step 13 to when electric arc is masked as 1 when electric arc is masked as 0;
(11) time is judged for the first time, deducts current waveform displacement start time T1 with current time T2, gets mistiming T
S1, work as T
S1Greater than setting value T
If 1The time forward step 12 to, less than setting value T
If 1The time forward step 3 to;
(12) set electric arc sign, promptly electric arc is masked as 1, arrives step 13 then;
(13) for the second time the time is judged, asks that T3 deducts current waveform displacement start time T1 when current, must a mistiming T
S2, work as T
S2Greater than setting value T
If 2The time forward step (14) to, less than setting value T
If 2The time forward step 3 to;
(14), and forward step 3 to all sign zero clearings;
Single-chip microcomputer is a timing sampling, and when in the following dual mode being arranged a kind of the appearance, interrupt routine is carried out in singlechip interruption work, and then continues to work on from the place of interrupting.
(1) regularly interrupt, a time period T is set, every time T, program will be interrupted by self-timing, in the reclocking again of having no progeny;
(2) AD converts interruption, preserves current value, and set AD converts sign, and promptly AD converts and is masked as 1.
Embodiment 2:
Different being of present embodiment and embodiment 1 maximum: topworks partly is the normally opened contact relay.When judging no arc fault, single-chip microcomputer 7 control output pins are changed to high level makes triode 10 conductings, is positioned at normally opened relay 9 adhesives of collector, and power supply is given circuit supply by closed relay, and holding circuit is normally moved; When having judged fault electric arc, single-chip microcomputer 7 can send the low level control signal, makes triode 10 end, and this moment, 9 disconnections of normally opened contact relay realized cutting off the electricity supply, and reached the protection to circuit.
Embodiment 3:
Different being of present embodiment and embodiment 1 maximum: topworks partly is the electrical apparatus release that powers on.When judging no arc fault, single-chip microcomputer 7 control output pins are changed to low level, and triode 10 ends, and is positioned at electrical apparatus release 9 closures that power on of transistor collector, and power supply is by closed electrical apparatus release power supply, normal operation circuit; When having judged fault electric arc, single-chip microcomputer 7 can send high-level control signal, makes triode 10 conductings, and the electrical apparatus release 9 that powers on this moment disconnects, and realizes cutting off the electricity supply, and reaches the protection to circuit.
Embodiment 4:
Different being of present embodiment and embodiment 1 maximum: topworks partly is the outage electrical apparatus release.When judging no arc fault, single-chip microcomputer 7 control output pins are changed to high level makes triode 10 conductings, is positioned at outage electrical apparatus release 9 closures of collector, and power supply is given circuit supply by closed electrical apparatus release, and holding circuit is normally moved; When having judged fault electric arc, the low level control signal is sent in single-chip microcomputer meeting 7, makes triode 10 end, and the electrical apparatus release 9 that cuts off the power supply this moment disconnects, and realizes cutting off the electricity supply, and reaches the protection to circuit.
Embodiment 5:
Different being of present embodiment and embodiment 1 maximum: topworks partly is controllable silicon.When judging no arc fault, single-chip microcomputer 7 control output pins are changed to low level, make triode 10 end, optocoupler 13 and optocoupler 16 conductings, and controllable silicon 9 and controllable silicon 17 conductings, power supply is given circuit supply, normal operation circuit by the controllable silicon of conducting; When having judged fault electric arc, single-chip microcomputer 7 can send high-level control signal, and triode 10 conductings make optocoupler 13 and optocoupler 16 end, and controllable silicon 9 and controllable silicon 17 disconnect, and realize cutting off the electricity supply, and reach the protection to circuit.
Claims (14)
1, fault arc detection method, this method can detect dangerous electric arc by the fault electric arc holding circuit, it is characterized in that comprising step:
In real time current signal is sampled by signal sampling device (2), and sampled data is offered signal processing module;
Signal processing module is handled current signal, the result is passed to arc-detection control device (7) detect, and when arc-detection control device (7) when detecting electric arc, produces the electric arc sign.
2, fault arc detection method according to claim 1 is characterized in that: the signal of signal sampling device (2) sampling is a current waveform.
3, fault arc detection method according to claim 1, it is characterized in that: signal processing module is handled current waveform.
4, fault arc detection method according to claim 1 is characterized in that: arc-detection control device (7) is judged, is detected the current waveform of handling.
5, fault arc detection method according to claim 1 is characterized in that: arc-detection control device (7) is a single-chip microcomputer, and its program circuit of judging, detecting current waveform is as follows:
(1) single-chip microcomputer carries out electrification reset, arrives step 2 then;
(2) Single Chip Microcomputer (SCM) program initialization, this moment, all zone bits were 0, analog signal conversion is that digital signal value corresponding AD is AD
0, the AD signal sampling is from a pin input of single-chip microcomputer, and the AD control signal arrives step 3 then by another pin output of single-chip microcomputer;
(3) single-chip microcomputer judges whether the AD conversion is finished, and when not having new AD value to produce, AD converts and is masked as 0, and continues to judge whether that new AD value produces; When new AD value produced, AD converted and is masked as 1, and writes down new AD value AD
1, arrive step 4 then;
(4) single-chip microcomputer zero clearing AD converts sign, and compares AD
1Value and AD
0Value, unequal to step 5, equal then arrive step 8;
(5) single-chip microcomputer upgrades the AD value automatically, with current AD value AD
1Replace existing AD value AD
0, arrive step 6 then;
(6) single-chip microcomputer detects the electric arc sign, when electric arc is masked as 0, forwards step 14 to; When electric arc is masked as 1, to step 7;
(7) single-chip microcomputer sends the control signal of cutting off the electricity supply;
(8) single-chip microcomputer detects and finds the electric arc sign, when finding that electric arc forwards step 9 to when being masked as 0, when finding that electric arc forwards step 10 to when being masked as 1;
(9) preserve the time this moment, be designated as T1, the electric arc sign is found in set, finds that promptly electric arc is masked as 1, arrives step 10 then;
(10) single-chip microcomputer detects the electric arc sign, to step 11, forwards step 13 to when electric arc is masked as 1 when electric arc is masked as 0;
(11) time is judged for the first time, deducts current waveform displacement start time T1 with current time T2, gets mistiming T
S1, work as T
S1Greater than setting value T
If 1The time forward step 12 to, less than setting value T
If 1The time forward step 3 to;
(12) set electric arc sign, promptly electric arc is masked as 1, arrives step 13 then;
(13) time is judged for the second time, deducts current waveform displacement start time T1 with current time T3, gets a mistiming T
S2, work as T
S2Greater than setting value T
If 2The time forward step 14 to, less than setting value T
If 2The time forward step 3 to;
(14), and forward step 3 to all sign zero clearings.
6, fault arc detection method according to claim 5, it is characterized in that: single-chip microcomputer (7) detects, judges that the program of current waveform comprises interrupt routine: a time period T is set, every time T, program will self-timing be interrupted, in the reclocking of having no progeny.
7, fault arc detection method according to claim 5 is characterized in that: single-chip microcomputer (7) detects, judges that the program of current waveform comprises interrupt routine: AD converts interruption, and single-chip microcomputer is preserved current value, and set AD converts sign.
8, the fault electric arc holding circuit comprises power unit, it is characterized in that: described fault electric arc protector also comprises signal sampling device (2), signal processing module, arc-detection control device (7) and the module of cutting off the electricity supply.
9, fault electric arc holding circuit according to claim 8 is characterized in that: described signal sampling device (2) is the current transformer of ribbon core; Described signal processing module has connected all-wave diode rectifier bridge (3), divider resistance R successively
1(4) and R
3(5); Described arc-detection control device (7) is a single-chip microcomputer; The described module of cutting off the electricity supply has connected triode (10) and topworks's part (9) successively.
10, fault electric arc protector according to claim 9 is characterized in that: described topworks's part (9) is the normally closed contact relay.
11, fault electric arc protector according to claim 9 is characterized in that: described topworks's part (9) is the normally opened contact relay.
12, fault electric arc protector according to claim 9 is characterized in that: described topworks's part (9) is the electrical apparatus release that powers on.
13, fault electric arc protector according to claim 9 is characterized in that: described topworks's part (9) is the outage electrical apparatus release.
14, fault electric arc protector according to claim 9 is characterized in that: described topworks's part (9) is a controllable silicon.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100339261A CN100432683C (en) | 2005-03-31 | 2005-03-31 | Fault arc detection method and protection circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100339261A CN100432683C (en) | 2005-03-31 | 2005-03-31 | Fault arc detection method and protection circuit thereof |
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| CN1841074A true CN1841074A (en) | 2006-10-04 |
| CN100432683C CN100432683C (en) | 2008-11-12 |
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| CN100452598C (en) * | 2005-08-19 | 2009-01-14 | 珠海格力电器股份有限公司 | Protection circuit for fault electric arc, and method for detecting fault electric arc |
| CN101154800B (en) * | 2007-09-29 | 2010-11-17 | 吴为麟 | Device for detecting trouble electric arc |
| CN101902030A (en) * | 2010-07-14 | 2010-12-01 | 西安交通大学 | Detecting and positioning device of arc fault of switch apparatus |
| CN102288857A (en) * | 2011-05-18 | 2011-12-21 | 浙江科技学院 | Fault arc identification and detection method and detection protection device |
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| CN102955090A (en) * | 2012-11-28 | 2013-03-06 | 华侨大学 | Electric arc fault detection method and circuit system for high-power household appliances |
| CN102981088A (en) * | 2012-12-12 | 2013-03-20 | 天津市鸿远电气设备有限公司 | Detection method for fault arc |
| CN105223427A (en) * | 2014-06-17 | 2016-01-06 | 西门子公司 | The detection method of fault electric arc and pick-up unit |
| CN105765812A (en) * | 2013-11-22 | 2016-07-13 | 通用电气航空系统有限公司 | Method for detecting electrical faults in a circuit |
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| CN101902030A (en) * | 2010-07-14 | 2010-12-01 | 西安交通大学 | Detecting and positioning device of arc fault of switch apparatus |
| CN102288857B (en) * | 2011-05-18 | 2013-06-19 | 浙江科技学院 | Fault arc identification and detection method and detection protection device |
| CN102288857A (en) * | 2011-05-18 | 2011-12-21 | 浙江科技学院 | Fault arc identification and detection method and detection protection device |
| CN102721896B (en) * | 2012-07-05 | 2015-11-18 | 天津市鸿远电气设备有限公司 | Fault arc detection method |
| CN102721896A (en) * | 2012-07-05 | 2012-10-10 | 天津市鸿远电气设备有限公司 | Stoppage arc detection method |
| CN102955090A (en) * | 2012-11-28 | 2013-03-06 | 华侨大学 | Electric arc fault detection method and circuit system for high-power household appliances |
| CN102981088A (en) * | 2012-12-12 | 2013-03-20 | 天津市鸿远电气设备有限公司 | Detection method for fault arc |
| CN102981088B (en) * | 2012-12-12 | 2016-01-20 | 天津市鸿远电气股份有限公司 | Fault arc detection method |
| CN105765812A (en) * | 2013-11-22 | 2016-07-13 | 通用电气航空系统有限公司 | Method for detecting electrical faults in a circuit |
| US9915694B2 (en) | 2013-11-22 | 2018-03-13 | Ge Aviation Systems Limited | Method for detecting electrical faults in a circuit |
| CN105765812B (en) * | 2013-11-22 | 2018-11-20 | 通用电气航空系统有限公司 | Method for the electric fault in detection circuit |
| CN105223427A (en) * | 2014-06-17 | 2016-01-06 | 西门子公司 | The detection method of fault electric arc and pick-up unit |
| CN105223427B (en) * | 2014-06-17 | 2019-05-17 | 西门子公司 | The detection method and detection device of fault electric arc |
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| CN113049925A (en) * | 2021-03-01 | 2021-06-29 | 合肥依科普工业设备有限公司 | Arc fire detection method |
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Assignee: Gree Electric Enterprises (Maanshan) Ltd. Assignor: GREE ELECTRIC APPLIANCES Inc. OF ZHUHAI Contract record no.: 2011440000672 Denomination of invention: Fault arc detection method and protection circuit thereof Granted publication date: 20081112 License type: Exclusive License Open date: 20061004 Record date: 20110711 |