CN103376389A - Fault electric arc judgment system for low-voltage line and judgment method thereof - Google Patents
Fault electric arc judgment system for low-voltage line and judgment method thereof Download PDFInfo
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- CN103376389A CN103376389A CN2013103239096A CN201310323909A CN103376389A CN 103376389 A CN103376389 A CN 103376389A CN 2013103239096 A CN2013103239096 A CN 2013103239096A CN 201310323909 A CN201310323909 A CN 201310323909A CN 103376389 A CN103376389 A CN 103376389A
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Abstract
The invention discloses a fault electric arc judgment system for a low-voltage line and a judgment method thereof. The system comprises a load loop, a voltage sampling circuit connected at the output end of the load loop, and a current sampling circuit, wherein the output end of the voltage sampling circuit and the output end of the current sampling circuit are respectively connected with the input end of a microprocessor. The voltage sampling circuit detects the voltage of the load loop and transmits a sampling value to the microprocessor, and the current sampling circuit is used for detecting the current of the load loop, and transmitting a sampling value to the microprocessor. The microprocessor conducts judgment according to current characteristics of the system in the load loop, when the microprocessor detects that a certain semi-cycle wave of the current disappears, and the result obtained by the mode that the unsteady load characteristic is subtracted from the steady-state load characteristic is a certain reserved resistive difference value section, the judgment on whether a fault electric arc occurs or not is carried out, and the output of the switching value is controlled so as to inform whether the fault electric arc occurs or not. Meanwhile, filtering is carried out on the character of a non-fault electric arc, and the misjudgment on the fault electric arc is effectively avoided.
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 the low-voltage circuit can not be ignored; at present for protection product and the technology widespread use of overcurrent with the electric leakage problem; product and technology for the fault electric arc problem still are in the starting stage at home; many companies are releasing various faults electric arc circuit breaker on the market; but common problem is misoperation; namely produce the erroneous judgement action in non-fault electric arc situation, 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, when fault electric arc occurs, judge rapidly, can effectively 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 is judged system, comprise load circuit, further comprise the voltage sampling circuit and the current sampling circuit that are connected to the load circuit output terminal, the output terminal of voltage sampling circuit and current sampling circuit connects respectively the input end of microprocessor.
Further, the output terminal of described microprocessor connects an indicating circuit.Described indicating circuit is the switching value signal circuit, output end of microprocessor gauge tap amount signal circuit, and the external alarm appliance of the output terminal of switching value signal circuit or communicating circuit.
Described load circuit is connected between zero line and the live wire.
A kind ofly judge the determination methods of system based on 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 the load circuit and electric current respectively, draw load circuit steady state load characteristic;
Whether certain half cycles that step 2. detects in real time the load circuit electric current of current sampling circuit collection disappears, and is execution in step 3 then, otherwise skips to step 1;
In the Preset Time, voltage sampling circuit and current sampling circuit detected the unstable state voltage and current of load circuit respectively, obtain load circuit unstable state load characteristic after step 3. half cycles disappeared;
Step 4. microprocessor deducts the unstable state load characteristic with the steady state load characteristic, and whether judged result is that predetermined resistive difference is interval, is then to be judged to be fault electric arc to occur and execution in step 5, otherwise skips to step 1;
Step 5. output switch amount signal indication fault electric arc occurs.
Further, described load characteristic comprises equivalent resistance and power factor.
Further, the described Preset Time of step 3 is definite value by judging default, and adjusts as the case may be.
Further, the interval empirical value for drawing according to series fault arc experiment and parallel arc fault experiment of described predetermined resistive difference.
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 the load circuit electric current, and sampled value is transported to microprocessor; With the generation of notice fault electric arc whether microprocessor carries out the judgement whether fault electric arc occurs, and gauge tap amount output,, judge rapidly when fault electric arc occurs, can effectively avoid judging by accident.
Description of drawings
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, provide a kind of fault electric arc for low-voltage circuit to judge system and determination methods thereof, formed by circuit part and software section, circuit part carries out sampling processing and is input to microprocessor the voltage and current in the circuit, software section in the microprocessor is judged for the feature of fault electric arc, provide accordingly the signal whether fault electric arc occurs, simultaneously the feature of non-fault electric arc is carried out filtering, thereby effectively avoided the erroneous judgement to fault electric arc.Be suitable for manufacturing and designing of fault electric arc isolating switch or electric fire alarm device, the technology novel application has a extensive future.
Be elaborated with reference to accompanying drawing below in conjunction with embodiment, in order to technical characterictic of the present invention and advantage are carried out more deep annotation.
System principle diagram of the present invention as shown in Figure 1, a kind of fault electric arc for low-voltage circuit is judged system, comprise load circuit, further comprise the voltage sampling circuit and the current sampling circuit that are connected to the load circuit output terminal, the output terminal of voltage sampling circuit and current sampling circuit connects respectively the input end of microprocessor.
Further, the output terminal of described microprocessor connects an indicating circuit.Described indicating circuit is the switching value signal circuit, output end of microprocessor gauge tap amount signal circuit, and the external alarm appliance of the output terminal of switching value signal circuit or communicating circuit.
Described load circuit is connected between zero line and the live wire.
Circuit theory part is as shown in Figure 1 used voltage sampling circuit that load circuit voltage is detected, and sampled value is transported to microprocessor; Use current sampling circuit that the load circuit electric current is detected, and sampled value is transported to microprocessor; With the generation of notice fault electric arc whether microprocessor carries out the judgement whether fault electric arc occurs, and gauge tap amount signal output.
A kind of fault electric arc for low-voltage circuit provided by the invention is judged the determination methods of system, based on two bases for estimation.First: according to for described system the current characteristic in the load circuit being judged, when certain half cycles that detects electric current disappears, as one of criterion of fault electric arc generation; Second: interval for certain predetermined resistive difference if the steady state load characteristic deducts the result of unstable state load characteristic, one of criterion that then occurs as fault electric arc.Both criterions that occur when fault electric arc all satisfy, and then failure judgement electric arc occurs.
About second basis for estimation be: described system detects the steady state voltage in the load circuit and electric current, and draws detection loop steady state load characteristic, and load characteristic comprises equivalent resistance and power factor; When certain half cycles that detects electric current disappears, namely detect the unstable state load characteristic in constantly rear a period of time of half cycles disappearance, load characteristic comprises equivalent resistance and power factor; System's contrast steady state load characteristic and unstable state load characteristic, if it is interval for certain predetermined resistive difference that the steady state load characteristic deducts the result of unstable state load characteristic, one of criterion that then occurs as fault electric arc, if deducting the result of unstable state load characteristic, the steady state load characteristic exceeds predetermined resistive difference interval, then but failure judgement electric arc does not occur, the interval empirical value for drawing according to series fault arc experiment and parallel arc fault experiment of the employed predetermined resistive difference of system.
Method flow diagram of the present invention is a kind ofly judged the determination methods of system based on described fault electric arc for low-voltage circuit as shown in Figure 2, and its step is as follows:
Step 1. voltage sampling circuit and current sampling circuit detect the steady state voltage in the 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 in real time the load circuit electric current of current sampling circuit collection disappears, and is execution in step 3 then, otherwise skips to step 1;
In the Preset Time, voltage sampling circuit and current sampling circuit detected the unstable state voltage and current of load circuit respectively, obtain load circuit unstable state load characteristic after step 3. half cycles disappeared; Unstable state voltage and current described herein refers to that certain half cycles of load circuit electric current disappears and is unstable state in a period of time of constantly rising;
Step 4. microprocessor deducts the unstable state load characteristic with the steady state load characteristic, and whether judged result is that predetermined resistive difference is interval, is then to be judged to be fault electric arc to occur and execution in step 5, otherwise skips to step 1; Microprocessor deducts the unstable state load characteristic with the steady state load characteristic, obtains actual resistive difference, the resistive resistance characteristic that is generally in the load characteristic, and resistive difference steady state load characteristic deducts the difference of unstable state load characteristic;
Step 5. output switch amount signal indication fault electric arc occurs.
Further, described load characteristic comprises equivalent resistance and power factor.
Further, the described Preset Time of step 3 is definite value by judging default, and adjusts as the case may be.
Further, the interval empirical value for drawing according to series fault arc experiment and parallel arc fault experiment of described predetermined resistive difference.
By the technical scheme among the above embodiment the present invention is carried out clear, complete description, obvious described embodiment is the embodiment of a part of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Claims (8)
1. a fault electric arc that is used for low-voltage circuit is judged system, comprise load circuit, it is characterized in that: further comprise the voltage sampling circuit and the current sampling circuit that are connected to the load circuit output terminal, the output terminal of voltage sampling circuit and current sampling circuit connects respectively the input end of microprocessor.
2. the fault electric arc for low-voltage circuit according to claim 1 is judged system, and it is characterized in that: the output terminal of described microprocessor connects an indicating circuit.
3. the fault electric arc for low-voltage circuit according to claim 2 is judged system, and it is characterized in that: described indicating circuit is the switching value signal circuit.
4. the fault electric arc for low-voltage circuit according to claim 1 is judged system, and it is characterized in that: described load circuit is connected between zero line and the live wire.
5. judge based on each described fault electric arc for low-voltage circuit among the claim 1-4 and the determination methods of system it is characterized in that its step is as follows for one kind:
Step 1. voltage sampling circuit and current sampling circuit detect the steady state voltage in the load circuit and electric current respectively, draw load circuit steady state load characteristic;
Whether certain half cycles that step 2. detects in real time the load circuit electric current of current sampling circuit collection disappears, and is execution in step 3 then, otherwise skips to step 1;
In the Preset Time, voltage sampling circuit and current sampling circuit detected the unstable state voltage and current of load circuit respectively, obtain load circuit unstable state load characteristic after step 3. half cycles disappeared;
Step 4. microprocessor deducts the unstable state load characteristic with the steady state load characteristic, and whether judged result is that predetermined resistive difference is interval, is then to be judged to be fault electric arc to occur and execution in step 5, otherwise skips to step 1;
Step 5. output switch amount signal indication Circuit display fault electric arc occurs.
6. the fault electric arc for low-voltage circuit according to claim 5 is judged the determination methods of system, and it is characterized in that: described load characteristic comprises equivalent resistance and power factor.
7. the fault electric arc for low-voltage circuit according to claim 6 is judged the determination methods of system, it is characterized in that: the described Preset Time of step 3 is definite value by judging default, and adjusts as the case may be.
8. the fault electric arc for low-voltage circuit according to claim 7 is judged the determination methods of system, it is characterized in that: the interval empirical value for drawing according to series fault arc experiment and parallel arc fault experiment of described predetermined resistive difference.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991587A (en) * | 2017-11-27 | 2018-05-04 | 北京腾控科技有限公司 | A kind of fault arc detection method detected by electric arc pulse signal starting |
| CN110058133A (en) * | 2019-04-15 | 2019-07-26 | 杭州拓深科技有限公司 | A kind of electrical circuit fault electric arc wrong report optimization method based on feedback mechanism |
| CN112964966A (en) * | 2021-03-15 | 2021-06-15 | 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991587A (en) * | 2017-11-27 | 2018-05-04 | 北京腾控科技有限公司 | A kind of fault arc detection method detected by electric arc pulse signal starting |
| 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 |
| CN110058133A (en) * | 2019-04-15 | 2019-07-26 | 杭州拓深科技有限公司 | A kind of electrical circuit fault electric arc wrong report optimization method based on feedback mechanism |
| 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 |
| CN112964966A (en) * | 2021-03-15 | 2021-06-15 | 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 |
| 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 |
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| CN103376389B (en) | 2015-12-09 |
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