CN103376389B - A kind of fault electric arc for low-voltage circuit judges system and determination methods thereof - Google Patents
A kind of fault electric arc for low-voltage circuit judges system and determination methods thereof Download PDFInfo
- Publication number
- CN103376389B CN103376389B CN201310323909.6A CN201310323909A CN103376389B CN 103376389 B CN103376389 B CN 103376389B CN 201310323909 A CN201310323909 A CN 201310323909A CN 103376389 B CN103376389 B CN 103376389B
- Authority
- CN
- China
- Prior art keywords
- circuit
- electric arc
- voltage
- sampling circuit
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention discloses a kind of fault electric arc for low-voltage circuit and judge system and determination methods thereof, described system comprises load circuit, is connected to voltage sampling circuit and the current sampling circuit of load circuit output terminal, and the output terminal of voltage sampling circuit and current sampling circuit connects the input end of microprocessor respectively.Voltage sampling circuit detects load circuit voltage, and sampled value is transported to microprocessor; Use current sampling circuit to detect load circuit electric current, and sampled value is transported to microprocessor.Microprocessor judges the current characteristic in load circuit according to system, when detecting that certain half cycles of electric current disappears, and steady state load characteristic deducts the result of unstable state load characteristic for certain predetermined resistive difference interval, carry out the judgement whether fault electric arc occurs, and gauge tap amount exports, whether to notify the generation of fault electric arc.Filtering is carried out to the feature of non-faulting electric arc simultaneously, effectively avoid the erroneous judgement to fault electric arc.
Description
Technical field
The present invention relates to a kind of technical field of electricity, particularly relate to a kind of fault electric arc for low-voltage circuit and judge system and determination methods thereof.
Background technology
Electrical safety in low-voltage circuit can not be ignored; at present for protection product and the technology widespread use of overcurrent and electrical leakage problems; still the starting stage is at home for the product of fault electric arc problem and technology; many companies are releasing various faults electric arc circuit breaker on the market; but common problem is misoperation; namely under non-faulting arcing conditions, produce erroneous judgement action, its main cause is effective not for the judgment technology of fault electric arc.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of fault electric arc for low-voltage circuit to judge system and determination methods thereof, judge rapidly when fault electric arc occurs, effectively can avoid erroneous judgement.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of fault electric arc for low-voltage circuit judges system, comprise load circuit, comprise the voltage sampling circuit and current sampling circuit that are connected to load circuit output terminal further, the output terminal of voltage sampling circuit and current sampling circuit connects the input end of microprocessor respectively.
Further, the output terminal of described microprocessor connects an indicating circuit.Described indicating circuit is on-off model circuit, output end of microprocessor gauge tap amount signal circuit, and the external alarm appliance of the output terminal of on-off model circuit or communicating circuit.
Described load circuit is connected between zero line and live wire.
Judge a determination methods for system based on the described fault electric arc for low-voltage circuit, its step is as follows:
Step 1. voltage sampling circuit and current sampling circuit detect the steady state voltage in load circuit and electric current respectively, draw load circuit steady state load characteristic;
Whether certain half cycles that step 2. detects the load circuit electric current of current sampling circuit collection in real time disappears, and is perform step 3, otherwise skips to step 1;
After step 3. half cycles disappears in Preset Time, voltage sampling circuit and current sampling circuit detect the unstable state voltage and current of load circuit respectively, obtain load circuit unstable state load characteristic;
Steady state load characteristic is deducted unstable state load characteristic by step 4. microprocessor, and whether judged result is that predetermined resistive difference is interval, is be judged to be that fault electric arc occurs and performs step 5, otherwise skip to step 1;
Step 5. output switch amount signal represents that fault electric arc occurs.
Further, described load characteristic comprises equivalent resistance and power factor.
Further, the Preset Time described in step 3, by judging default, is definite value, and adjusts as the case may be.
Further, described predetermined resistive difference interval is for testing with parallel arc fault the empirical value drawn according to series fault arc experiment.
Compared with prior art, the invention has the beneficial effects as follows: by voltage sampling circuit, load circuit voltage is detected, and sampled value is transported to microprocessor; Current sampling circuit detects load circuit electric current, and sampled value is transported to microprocessor; Microprocessor carries out the judgement whether fault electric arc occurs, and gauge tap amount exports, and whether to notify the generation of fault electric arc, judges rapidly when fault electric arc occurs, can effectively avoid judging by accident.
Accompanying drawing explanation
Fig. 1 is system principle diagram of the present invention;
Fig. 2 is method flow diagram of the present invention.
Embodiment
Purport of the present invention is to overcome the deficiencies in the prior art, a kind of fault electric arc for low-voltage circuit is provided to judge system and determination methods thereof, be made up of circuit part and software section, circuit part carries out sampling processing to the voltage and current in circuit and is input to microprocessor, software section in microprocessor judges for the feature of fault electric arc, provide the signal whether fault electric arc occurs accordingly, filtering is carried out to the feature of non-faulting electric arc simultaneously, thus effectively avoid the erroneous judgement to fault electric arc.Be suitable for manufacturing and designing of fault electric arc isolating switch or electric fire alarm device, technology novel application has a extensive future.
Be described in detail, to be interpretated more in-depth technical characteristic of the present invention and advantage with reference to accompanying drawing below in conjunction with embodiment.
System principle diagram of the present invention as shown in Figure 1, a kind of fault electric arc for low-voltage circuit judges system, comprise load circuit, comprise the voltage sampling circuit and current sampling circuit that are connected to load circuit output terminal further, the output terminal of voltage sampling circuit and current sampling circuit connects the input end of microprocessor respectively.
Further, the output terminal of described microprocessor connects an indicating circuit.Described indicating circuit is on-off model circuit, output end of microprocessor gauge tap amount signal circuit, and the external alarm appliance of the output terminal of on-off model circuit or communicating circuit.
Described load circuit is connected between zero line and live wire.
Circuit theory part as shown in Figure 1, uses voltage sampling circuit to detect load circuit voltage, and sampled value is transported to microprocessor; Use current sampling circuit to detect load circuit electric current, and sampled value is transported to microprocessor; Microprocessor carries out the judgement whether fault electric arc occurs, and gauge tap amount signal exports, whether to notify the generation of fault electric arc.
A kind of fault electric arc for low-voltage circuit provided by the invention judges the determination methods of system, based on two bases for estimation.First: according to judging the current characteristic in load circuit for described system, when detecting that certain half cycles of electric current disappears, as one of criterion that fault electric arc occurs; Second: if the steady state load characteristic result that deducts unstable state load characteristic for certain predetermined resistive difference interval, then one of criterion occurred as fault electric arc.Both criterions occurred when fault electric arc are all satisfied, then failure judgement electric arc occurs.
About second basis for estimation be: described system detects the steady state voltage in load circuit and electric current, and draw measure loop steady state load characteristic, load characteristic comprises equivalent resistance and power factor; When detecting that certain half cycles of electric current disappears, the unstable state load characteristic namely after the detection half cycles disappearance moment in a period of time, load characteristic comprises equivalent resistance and power factor; System contrast steady state load characteristic and unstable state load characteristic, if steady state load characteristic deducts the result of unstable state load characteristic for certain predetermined resistive difference interval, then as one of the criterion that fault electric arc occurs, if the result that steady state load characteristic deducts unstable state load characteristic exceeds predetermined resistive difference interval, then can not occur by failure judgement electric arc, the predetermined resistive difference that system uses is interval for testing with parallel arc fault the empirical value drawn according to series fault arc experiment.
Method flow diagram of the present invention as shown in Figure 2, a kind of determination methods judging system based on the described fault electric arc for low-voltage circuit, its step is as follows:
Step 1. voltage sampling circuit and current sampling circuit detect the steady state voltage in load circuit and electric current respectively, draw load circuit steady state load characteristic; Steady state voltage described herein and electric current refer to that the cycle of voltage and current is stable state under normal circumstances;
Whether certain half cycles that step 2. detects the load circuit electric current of current sampling circuit collection in real time disappears, and is perform step 3, otherwise skips to step 1;
After step 3. half cycles disappears in Preset Time, voltage sampling circuit and current sampling circuit detect the unstable state voltage and current of load circuit respectively, obtain load circuit unstable state load characteristic; Unstable state voltage and current described herein refers to that in a period of time that certain half cycles disappearance moment of load circuit electric current rises be unstable state;
Steady state load characteristic is deducted unstable state load characteristic by step 4. microprocessor, and whether judged result is that predetermined resistive difference is interval, is be judged to be that fault electric arc occurs and performs step 5, otherwise skip to step 1; Steady state load characteristic is deducted unstable state load characteristic by microprocessor, obtains actual resistive difference, the resistive resistance characteristic be generally in load characteristic, and resistive difference steady state load characteristic deducts the difference of unstable state load characteristic;
Step 5. output switch amount signal represents that fault electric arc occurs.
Further, described load characteristic comprises equivalent resistance and power factor.
Further, the Preset Time described in step 3, by judging default, is definite value, and adjusts as the case may be.
Further, described predetermined resistive difference interval is for testing with parallel arc fault the empirical value drawn according to series fault arc experiment.
Carry out clear, complete description by the technical scheme in above embodiment to the present invention, obviously described embodiment is the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Claims (5)
1. the fault electric arc for low-voltage circuit judges the determination methods of system, described system comprises load circuit, it is characterized in that: comprise the voltage sampling circuit and current sampling circuit that are connected to load circuit output terminal further, the output terminal of voltage sampling circuit and current sampling circuit connects the input end of microprocessor respectively; The output terminal of described microprocessor connects an indicating circuit, and described indicating circuit is on-off model circuit;
Described determination methods, its step is as follows:
Step 1. voltage sampling circuit and current sampling circuit detect the steady state voltage in load circuit and electric current respectively, draw load circuit steady state load characteristic;
Whether certain half cycles that step 2. detects the load circuit electric current of current sampling circuit collection in real time disappears, and is perform step 3, otherwise skips to step 1;
After step 3. half cycles disappears in Preset Time, voltage sampling circuit and current sampling circuit detect the unstable state voltage and current of load circuit respectively, obtain load circuit unstable state load characteristic;
Steady state load characteristic is deducted unstable state load characteristic by step 4. microprocessor, and whether judged result is that predetermined resistive difference is interval, is be judged to be that fault electric arc occurs and performs step 5, otherwise skip to step 1;
Step 5. output switch amount signal represents that Circuit display fault electric arc occurs.
2. the fault electric arc for low-voltage circuit according to claim 1 judges the determination methods of system, and described load circuit is connected between zero line and live wire.
3. the fault electric arc for low-voltage circuit according to claim 2 judges the determination methods of system, it is characterized in that: described load characteristic comprises equivalent resistance and power factor.
4. the fault electric arc for low-voltage circuit according to claim 3 judges the determination methods of system, it is characterized in that: the Preset Time described in step 3, by judging default, is definite value, and adjusts as the case may be.
5. the fault electric arc for low-voltage circuit according to claim 4 judges the determination methods of system, it is characterized in that: described predetermined resistive difference interval is for testing with parallel arc fault the empirical value drawn according to series fault arc experiment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310323909.6A CN103376389B (en) | 2013-07-30 | 2013-07-30 | A kind of fault electric arc for low-voltage circuit judges system and determination methods thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310323909.6A CN103376389B (en) | 2013-07-30 | 2013-07-30 | A kind of fault electric arc for low-voltage circuit judges system and determination methods thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103376389A CN103376389A (en) | 2013-10-30 |
| CN103376389B true CN103376389B (en) | 2015-12-09 |
Family
ID=49461809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310323909.6A Active CN103376389B (en) | 2013-07-30 | 2013-07-30 | A kind of fault electric arc for low-voltage circuit judges system and determination methods thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103376389B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991587B (en) * | 2017-11-27 | 2019-11-12 | 北京腾控科技有限公司 | A kind of fault arc detection method detected by electric arc pulse signal starting |
| CN110058133B (en) * | 2019-04-15 | 2021-03-02 | 杭州拓深科技有限公司 | Feedback mechanism-based electric circuit fault arc false alarm optimization method |
| CN112964966B (en) * | 2021-03-15 | 2022-03-04 | 国网湖北省电力有限公司电力科学研究院 | Parallel arc fault positioning method and system for low-voltage distribution network |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5459630A (en) * | 1993-09-15 | 1995-10-17 | Eaton Corporation | Self testing circuit breaker ground fault and sputtering arc trip unit |
| CN1409122A (en) * | 2001-09-16 | 2003-04-09 | 薛小平 | Fault arc current detection circuit |
| CN101154800A (en) * | 2007-09-29 | 2008-04-02 | 吴为麟 | Method for detecting trouble electric arc and its protecting equipment |
| CN101577430A (en) * | 2008-05-08 | 2009-11-11 | 湖北盛佳电器设备有限公司 | Power factor compensating device |
| CN102375107A (en) * | 2011-09-20 | 2012-03-14 | 上海交通大学 | Method and device for detecting fault electric arc based on time-frequency comprehensive analysis |
-
2013
- 2013-07-30 CN CN201310323909.6A patent/CN103376389B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5459630A (en) * | 1993-09-15 | 1995-10-17 | Eaton Corporation | Self testing circuit breaker ground fault and sputtering arc trip unit |
| CN1409122A (en) * | 2001-09-16 | 2003-04-09 | 薛小平 | Fault arc current detection circuit |
| CN101154800A (en) * | 2007-09-29 | 2008-04-02 | 吴为麟 | Method for detecting trouble electric arc and its protecting equipment |
| CN101577430A (en) * | 2008-05-08 | 2009-11-11 | 湖北盛佳电器设备有限公司 | Power factor compensating device |
| CN102375107A (en) * | 2011-09-20 | 2012-03-14 | 上海交通大学 | Method and device for detecting fault electric arc based on time-frequency comprehensive analysis |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103376389A (en) | 2013-10-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103208776A (en) | Breaker circuit with fault self-detection function | |
| CN104698291A (en) | Detection circuit and detection method for three-phase four-wire system defective zero line function | |
| CN103376389B (en) | A kind of fault electric arc for low-voltage circuit judges system and determination methods thereof | |
| CN105529698B (en) | A kind of Intelligent electric gas holder of band self-checking function | |
| CN201194327Y (en) | Leakage detecting protection circuit | |
| CN203981767U (en) | Fault electric arc sampling and pick-up unit | |
| CN203929981U (en) | A kind of fault electric arc testing circuit | |
| CN111025102B (en) | Low-voltage arc fault detection method and device based on voltage waveform analysis | |
| CN204882821U (en) | Killer switch state detection circuitry | |
| CN204992521U (en) | Electric energy meter that single -phase electric energy meter operated a switch control circuit and made with this circuit | |
| CN204205560U (en) | leakage protection circuit | |
| CN204012658U (en) | Distribution transformer broken neutral line protective device | |
| CN105513253A (en) | Low-voltage distribution cabinet fire alarm system | |
| CN201966581U (en) | Electric leakage detection and protection circuit | |
| CN102255277A (en) | Leakage detection protection circuit | |
| CN104268993A (en) | Special breaker circuit for miniature prepaid electricity meter | |
| CN201422012Y (en) | Leakage detection and protection circuit with end-of-life detection and display function | |
| CN203180491U (en) | Electric leakage protection device | |
| CN201490684U (en) | Leakage detection protective circuit | |
| CN203133265U (en) | Hidden trouble monitor for high voltage mutual inductor of harmonious electric locomotive | |
| CN203839960U (en) | Reactive compensation intelligent combination switch having current detection function | |
| CN204695489U (en) | Multiloop fire detecting arrangement | |
| CN211826442U (en) | Fault current fusing element state detection device | |
| CN205038011U (en) | Water leakage detecting device | |
| CN210954287U (en) | Electric leakage display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |