CN104793112A - Low-voltage arc fault detection method and device - Google Patents
Low-voltage arc fault detection method and device Download PDFInfo
- Publication number
- CN104793112A CN104793112A CN201510157638.0A CN201510157638A CN104793112A CN 104793112 A CN104793112 A CN 104793112A CN 201510157638 A CN201510157638 A CN 201510157638A CN 104793112 A CN104793112 A CN 104793112A
- Authority
- CN
- China
- Prior art keywords
- signal
- power frequency
- current
- circuit
- voltage
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims description 29
- 230000007257 malfunction Effects 0.000 claims description 24
- 238000013519 translation Methods 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 19
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 3
- 238000010304 firing Methods 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 3
- 206010000369 Accident Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a low-voltage arc fault detection method and device. The method includes: sampling and processing voltage between a firing line and a null line of a protected circuit to acquire high-frequency pulse signals and sampling and processing current of the protected circuit to acquire current half-wave signals; selecting a sampling time window which includes multiple fundamental frequency cycles; judging the fundamental frequency cycles in the sampling time window one by one, and when G.30+H.20+M.50 is more than 50000, judging that one suspected fault signal is generated from one fundamental frequency cycle; continuously making statistics on the number N of suspected fault signals in the sampling time window, and when N is greater than or equal to 9, judging that a suspected arc fault occurs; judging the fundamental frequency cycles generating the suspected fault signals one by one, and when L.40+S.30+V.30 is more than 50000, judging the arc faults occur. The arc faults are monitored in real time through analysis of the high-frequency pulse signals and current characteristics, the arc faults and interference can be effectively distinguished, reliability is higher, and false tripping actions are reduced.
Description
Technical field
The present invention relates to low-voltage distribution system arc fault detection field, particularly relate to a kind of low-voltage arc fault detection method and the device that are not subject to running current waveform change interference.
Background technology
Along with the fast development of science and technology, Modern Family's electrifing degree improves constantly, and electrical equipment and household electrical appliance increase severely, and household electricity constantly increases, and the fire failure that electric fault causes is also more and more frequent, and this causes huge loss to society.According to relevant statistics, electrical fire accident rate is in first of all kinds of fire, reaches 30.3%.In fire accidents, this ratio is larger, up to 46.1%.Arc fault be due to loose contact, connect loosen, insulation ag(e)ing, fracture etc. cause.The feature of fault electric arc is that in circuit, electric current may reduce, but temperature is high, and fault is expanded rapidly, until light neighbouring combustible and initiation fire.So prevent this fire caused by arc fault particularly important.
Traditional circuit-breakers for over-current protection and Aftercurrent protection circuit breaker generally do not have the effect of fault electric arc protection.Domestic be at present also in domestic circuit arc fault field the research and development stage, although there is fewer companies to develop arc-fault circuit interrupter for domestic circuit, but it does not also really start in circulation on the market, its reliability is also not yet well verified.
At present, China has formulated corresponding technical manual for 220V/50HZ electrical network, comprise GB " electric fire monitoring system--the 4th part: fault electric arc sniffer " and " General Requirements of arc fault detection device (AFDD) ", GB is met in order to make arc fault detection device, can detect and distinguish electric arc and normal load interference, and there will not be false tripping phenomenon.Therefore, arc fault detection apparatus and method need further to improve, and avoid occurring erroneous judgement.
Summary of the invention
For above-mentioned technical matters, the invention provides a kind of can effectively differentiation and arc fault occurs or the low-voltage arc fault detection method of the interference that load normally starts, power adjustments etc. causes.
Present invention also offers a kind of Low voltage arc fault pick-up unit.
Technical scheme provided by the invention is:
A kind of low-voltage arc fault detection method, comprising:
Sample to the voltage between the live wire of protected circuit and zero line and process and obtain high-frequency pulse signal, sampling to the electric current of protected circuit and process obtains current half wave signal;
Pulse number G, pulse width and the H of statistics high-frequency pulse signal in each power frequency period and maximum pulse M; Statistics coefficient of variation S, zero of current half wave in each power frequency period stops rate of change L and V
max, wherein, V=di/dt, in arbitrary power frequency period zero to stop rate of change be that zero difference of stopping changing value that zero of the power frequency period be adjacent stops changing value and this power frequency period stops changing value divided by zero of this power frequency period again;
A selected sampling time window, a sampling time window comprises several power frequency periods;
One by one each power frequency period in described sampling time window is judged, as G30+H20+M50 > 50000, then judge to create a suspected malfunctions signal at a power frequency period; Continue the number N of the suspected malfunctions signal of statistics in described sampling time window, when N >=9, then judge doubtful arc fault occurs; One by one the power frequency period creating suspected malfunctions signal is judged again, as L40+S30+V30 > 50000, then judge arc fault occurs.
Preferably, in described low-voltage arc fault detection method, described sampling time window adopts the sliding time window upgraded continuously.
Preferably, in described low-voltage arc fault detection method, as G30+H20+M50 < 50000, then judge not produce fault-signal at a power frequency period; As L40+S30+V30 < 50000, then judge not produce fault-signal at a power frequency period.
Preferably, in described low-voltage arc fault detection method, a sampling time window comprises 100 power frequency periods.
Preferably, in described low-voltage arc fault detection method, sampling to the voltage between the live wire of protected circuit and zero line and process obtains high-frequency pulse signal, especially by following process implementation:
By high-frequency coupling circuit, the voltage between the live wire of protected circuit and zero line is sampled, obtain high-frequency current signal; An I/V translation circuit again by being connected to high-frequency coupling circuit secondary side changes high-frequency current signal into high-frequency voltage signal; The high-frequency voltage signal that one I/V translation circuit exports is input to logarithmic detector circuit by bandpass filter and carries out detection acquisition high-frequency pulse signal;
The electric current of protected circuit is sampled and is processed and obtains current half wave signal, particular by following process implementation:
Sampled by the electric current of current transformer to protected circuit, obtain AC current waveform signal; The 2nd I/V translation circuit again by being connected to Current Transformer Secondary side changes this AC current waveform signal into AC voltage waveform signal; The AC voltage waveform signal that 2nd I/V translation circuit exports is by obtaining the current half wave signal being applicable to AD sampling after signal condition.
A kind of Low voltage arc fault pick-up unit, comprising:
High-frequency pulse signal generative circuit, it obtains high-frequency pulse signal for sampling to the voltage between the live wire of protected circuit and zero line and process;
Current half wave signal generating circuit, it obtains current half wave signal for sampling to the electric current of protected circuit and process;
Processing module, it for adding up pulse number G, pulse width and the H of high-frequency pulse signal in each power frequency period and maximum pulse M, and stops rate of change L and V for the coefficient of variation S, zero adding up current half wave in each power frequency period
max, wherein, V=di/dt, in arbitrary power frequency period zero to stop rate of change be that zero difference of stopping changing value that zero of the power frequency period be adjacent stops changing value and this power frequency period stops changing value divided by zero of this power frequency period again;
Described processing module is used for a selected sampling time window thereon, and a sampling time window comprises several power frequency periods;
Described processing module is used for judging each power frequency period in described sampling time window one by one, as G30+H20+M50 > 50000, then judge to create a suspected malfunctions signal at a power frequency period, continue the number N of the suspected malfunctions signal of statistics in described sampling time window, when N >=9, then judge doubtful arc fault occurs, one by one the power frequency period creating suspected malfunctions signal is judged again, as L40+S30+V30 > 50000, then judge arc fault occurs.
Preferably, in described Low voltage arc fault pick-up unit, described sampling time window adopts the sliding time window upgraded continuously.
Preferably, in described Low voltage arc fault pick-up unit, as G30+H20+M50 < 50000, then judge not produce fault-signal at a power frequency period; As L40+S30+V30 < 50000, then judge not produce fault-signal at a power frequency period.
Preferably, in described Low voltage arc fault pick-up unit, a sampling time window comprises 100 power frequency periods.
Preferably, in described Low voltage arc fault pick-up unit, described high-frequency pulse signal generative circuit comprise for the voltage between the live wire of protected circuit and zero line is sampled and obtain the high-frequency coupling circuit of high-frequency current signal, be connected to high-frequency coupling circuit secondary side for high-frequency current signal is changed into high-frequency voltage signal an I/V translation circuit, be used for high-frequency voltage signal to amplify and carry out the bandpass filter of bandpass filtering and be used for the logarithmic detector circuit that the signal shaping after by bandpass filtering becomes high-frequency pulse signal; Described current half wave signal generating circuit comprise for the electric current of protected circuit is sampled and obtain the current transformer of AC current waveform signal, be connected to Current Transformer Secondary side for this AC current waveform signal change into AC voltage waveform signal the 2nd I/V translation circuit and for by AC voltage waveform signal by forming the signal conditioning circuit of current half wave signal being applicable to AD sampling after signal condition.
The present invention is to high-frequency pulse signal analysis, mutation analysis again to current characteristic in the bonding unit time, comprehensive multiple features carries out arc fault Real-Time Monitoring, effectively can distinguish and arc fault occur or the interference that load normally starts, power adjustments etc. causes, can monitor fault electric arc with higher reliability, the mistake reducing device thus takes off action.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of Low voltage arc fault pick-up unit of the present invention;
Fig. 2 is the process flow diagram of an embodiment of low-voltage arc fault detection method of the present invention;
Fig. 3 is the process flow diagram that in an embodiment, microprocessor performs;
Fig. 4 is the sampling process flow diagram of an embodiment medium-high frequency pulse signal;
Fig. 5 is the sampling process flow diagram of current half wave signal in an embodiment.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to instructions word to make those skilled in the art.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the invention provides a kind of low-voltage arc fault detection method, comprise: sampling to the voltage between the live wire of protected circuit and zero line and process obtains high-frequency pulse signal, and sampling to the electric current of protected circuit and process obtains current half wave signal; Pulse number G, pulse width and the H of statistics high-frequency pulse signal in each power frequency period and maximum pulse M; Statistics coefficient of variation S, zero of current half wave in each power frequency period stops rate of change L and V
max, wherein, V=di/dt, in arbitrary power frequency period zero to stop rate of change be that zero difference of stopping changing value that zero of the power frequency period be adjacent stops changing value and this power frequency period stops changing value divided by zero of this power frequency period again; A selected sampling time window, a sampling time window comprises several power frequency periods; One by one each power frequency period in described sampling time window is judged, as G30+H20+M50 > 50000, then judge to create a suspected malfunctions signal at a power frequency period; Continue the number N of the suspected malfunctions signal of statistics in described sampling time window, when N>=9, then judge doubtful arc fault occurs; One by one the power frequency period creating suspected malfunctions signal is judged again, as L40+S30+V30 > 50000, then judge arc fault occurs.
Predetermined time cycle (i.e. a power frequency period) catches high-frequency pulse signal, the pulse number G of real-time update high-frequency pulse signal, pulse width and H and maximum pulse M, the final high-frequency pulse signal that obtains is at the pulse number G of each power frequency period, pulse width and H and maximum pulse M.Changed zero of the current half wave obtaining each power frequency period by timing A/D and stop changing value, periodic current integrated value and maximum V value (i.e. V
max), V=di/dt, calculate the zero coefficient of variation S stopping rate of change L and periodic current, wherein, it is that zero difference of stopping changing value that zero of the power frequency period be adjacent stops changing value and this power frequency period stops changing value divided by zero of this power frequency period again that zero of this power frequency period stops rate of change.Preferably, adjacent power frequency period selects a rear power frequency period of current power frequency period.In addition, half wave cycles equals power frequency period.
Multiple high-frequency impulse is collected in a power frequency period, if pulse number, pulse width and, maximum pulse ratio and exceed threshold value then this is designated as a suspected malfunctions signal, concrete formula is: G30+H20+M50 > 50000.As suspected malfunctions signal t in sampling time window
1interior accumulative number N, more than eight, namely judges doubtful arc fault occurs.Now, for the power frequency period creating suspected malfunctions signal, if zero stop rate of change L, the coefficient of variation S of periodic current and the ratio of maximum di/dt value V and exceed setting threshold value time, then judge occur arc fault, concrete formula is: L40+S30+V30 > 50000.That is, as long as having a power frequency period to be determined is that arc fault occurs, just prove that whole protected circuit there occurs arc fault really.
When microprocessor judges arc fault occurs, microprocessor triggers trip circuit, electromechanical interface is threaded off, with timely disconnecting circuit.
In the present invention, the algorithm of the suspected malfunctions signal number N in statistic sampling time window is: define a variable Temp for storing the result of determination of current demand signal, when current demand signal is judged to be non-faulting signal, and Temp=0, when current demand signal is judged to be suspected malfunctions signal, Temp=1.Defining a length is that the integer array D [100] of 100 is for storing the result of determination of 100 half wave cycles, each half wave cycles is after judging, 0-99 element every in array is moved one to a high position, by current Temp value stored in the lowest order D [0] of array.To array D [100] summation, the accumulative doubtful arcing fault signal number N monitored in 100 half wave cycles can be drawn.
Similarly, the algorithm of arc fault in similar algorithm statistic sampling time window can be adopted.Its process is: define a variable True for storing the result of determination of current demand signal, when current demand signal is judged to be non-faulting signal, and True=0, when current demand signal is judged to be fault-signal (namely judging to there occurs arc fault), True=1; Defining a length is that the integer array R [100] of 100 is for storing the result of determination of 100 half wave cycles, after each half wave cycles judges, 0-99 element every in array is moved one to a high position, by current Temp value stored in the lowest order R [0] of array.To array R [100] summation, the accumulative arcing fault signal number N monitored in 100 half wave cycles can be drawn.Due to after determining a fault-signal, the circuit in downstream has just been disconnected, therefore actual monitoring to arcing fault signal be one.
Particularly, running the above-mentioned algorithm to adding up doubtful arcing fault signal and arcing fault signal on the microprocessor, judging to realize arc fault.Be stored into data in array D [100] and array R [100], the position of data in two arrays of same power frequency period is identical simultaneously.When the number of the doubtful arcing fault signal in array D [100] reaches threshold value, if the Temp numerical value in array D [100] is the Temp numerical value of the element of element in the same position of array R [100] of 1 is also 1, then judge to there occurs arc fault.
Wherein, the implication of " current demand signal " is one section of current half wave signal in a power frequency period, then accordingly, " non-faulting signal " and " suspected malfunctions signal " is all for one section of current half wave signal in a power frequency period.
" high-frequency pulse signal " and " current half wave signal " in " sample to the voltage between the live wire of protected circuit and zero line and process and obtain high-frequency pulse signal; sampling concerning the electric current of protected circuit and process obtains current half wave signal ", then relative to whole observation process, they have corresponding signal segment in each power frequency period.
The present invention analyzes high-frequency pulse signal, mutation analysis again to current characteristic in the bonding unit time, comprehensive multiple features carries out arc fault Real-Time Monitoring, effectively can distinguish and arc fault occur or the interference that load normally starts, power adjustments etc. causes, can monitor fault electric arc with higher reliability, the mistake reducing device thus takes off action.
In one embodiment, in described low-voltage arc fault detection method, as G30+H20+M50 < 50000, then judge not produce fault-signal at a power frequency period; As L40+S30+V30 < 50000, then judge not produce fault-signal at a power frequency period.
In one embodiment, in described low-voltage arc fault detection method, a sampling time window comprises 100 power frequency periods.In order to improve accuracy and the reliability of judgement, a sampling time window is made to comprise 100 power frequency periods.
In one embodiment, in described low-voltage arc fault detection method, described sampling time window adopts the sliding time window upgraded continuously.When adopting the sliding time window upgraded continuously, data upgrade at any time, when the data of one group of power frequency period (such as 100 power frequency periods) current in sampling time window do not determine arc fault, then the data of one group of power frequency period that time-sequencing is the most forward move forward one, the data of a power frequency period of up-to-date generation enter in sampling time window, be positioned at last position, again the data of this current group power frequency period are judged, to determine whether arc fault occurs.
In one embodiment, in described low-voltage arc fault detection method, voltage between the live wire of protected circuit and zero line is sampled and processed and obtains high-frequency pulse signal, especially by following process implementation: sampled to the voltage between the live wire of protected circuit and zero line by high-frequency coupling circuit, obtain high-frequency current signal; An I/V translation circuit again by being connected to high-frequency coupling circuit secondary side changes high-frequency current signal into high-frequency voltage signal; The high-frequency voltage signal that one I/V translation circuit exports is input to logarithmic detector circuit by bandpass filter and carries out detection acquisition high-frequency pulse signal.The electric current of protected circuit is sampled and processed and obtains current half wave signal, particular by following process implementation: sampled by the electric current of current transformer to protected circuit, obtain AC current waveform signal; The 2nd I/V translation circuit again by being connected to Current Transformer Secondary side changes this AC current waveform signal into AC voltage waveform signal; The AC voltage waveform signal that 2nd I/V translation circuit exports is by obtaining the current half wave signal being applicable to AD sampling after signal condition.
Refer to Fig. 1, present invention also offers a kind of Low voltage arc fault pick-up unit, comprising: high-frequency pulse signal generative circuit, it obtains high-frequency pulse signal for sampling to the voltage between the live wire of protected circuit and zero line and process; Current half wave signal generating circuit, it obtains current half wave signal for sampling to the electric current of protected circuit and process; Processing module, it for adding up pulse number G, pulse width and the H of high-frequency pulse signal in each power frequency period and maximum pulse M, and stops rate of change L and V for the coefficient of variation S, zero adding up current half wave in each power frequency period
max, wherein, V=di/dt, in arbitrary power frequency period zero to stop rate of change be that zero difference of stopping changing value that zero of the power frequency period be adjacent stops changing value and this power frequency period stops changing value divided by zero of this power frequency period again; Described processing module is used for a selected sampling time window thereon, and a sampling time window comprises several power frequency periods; Described processing module is used for judging each power frequency period in described sampling time window one by one, as G30+H20+M50 > 50000, then judge to create a suspected malfunctions signal at a power frequency period, continue the number N of the suspected malfunctions signal of statistics in described sampling time window, when N>=8, then judge doubtful arc fault occurs, one by one the power frequency period creating suspected malfunctions signal is judged again, as L40+S30+V30 > 50000, then judge arc fault occurs.
Processing module can select microprocessor, also select any can the module, device etc. of computing deterministic process.
In one embodiment, in described Low voltage arc fault pick-up unit, as G30+H20+M50 < 50000, then judge not produce fault-signal at a power frequency period; As L40+S30+V30 < 50000, then judge not produce fault-signal at a power frequency period.
In one embodiment, in described Low voltage arc fault pick-up unit, a sampling time window comprises 100 power frequency periods.
In one embodiment, in described Low voltage arc fault pick-up unit, described sampling time window adopts the sliding time window upgraded continuously.When adopting the sliding time window upgraded continuously, data upgrade at any time, when the data of one group of power frequency period (such as 100 power frequency periods) current in sampling time window do not determine arc fault, then the data of one group of power frequency period that time-sequencing is the most forward move forward one, the data of a power frequency period of up-to-date generation enter in sampling time window, be positioned at last position, again the data of this current group power frequency period are judged, to determine whether arc fault occurs.
In one embodiment; in described Low voltage arc fault pick-up unit, described high-frequency pulse signal generative circuit comprise for the voltage between the live wire of protected circuit and zero line is sampled and obtain the high-frequency coupling circuit of high-frequency current signal, be connected to high-frequency coupling circuit secondary side for high-frequency current signal is changed into high-frequency voltage signal an I/V translation circuit, be used for high-frequency voltage signal to amplify and carry out the bandpass filter of bandpass filtering and be used for the logarithmic detector circuit that the signal shaping after by bandpass filtering becomes high-frequency pulse signal.Described current half wave signal generating circuit comprise for the electric current of protected circuit is sampled and obtain the current transformer of AC current waveform signal, be connected to Current Transformer Secondary side for this AC current waveform signal change into AC voltage waveform signal the 2nd I/V translation circuit and for by AC voltage waveform signal by forming the signal conditioning circuit of current half wave signal being applicable to AD sampling after signal condition.
Further, a described I/V translation circuit and second/V translation circuit can adopt build-out resistor.Described logarithmic detector circuit adopts number detector amplifier.Described signal conditioning circuit comprises amplifying circuit, low-pass filter circuit and adding circuit.Described Low voltage arc fault pick-up unit also includes and is connected to microprocessor and the power circuit of powering to device.
Although embodiment of the present invention are open as above, but it is not restricted to listed in instructions and embodiment utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (10)
1. a low-voltage arc fault detection method, is characterized in that, comprising:
Sample to the voltage between the live wire of protected circuit and zero line and process and obtain high-frequency pulse signal, sampling to the electric current of protected circuit and process obtains current half wave signal;
Pulse number G, pulse width and the H of statistics high-frequency pulse signal in each power frequency period and maximum pulse M; Statistics coefficient of variation S, zero of current half wave in each power frequency period stops rate of change L and V
max, wherein, V=di/dt, in arbitrary power frequency period zero to stop rate of change be that zero difference of stopping changing value that zero of the power frequency period be adjacent stops changing value and this power frequency period stops changing value divided by zero of this power frequency period again;
A selected sampling time window, a sampling time window comprises several power frequency periods;
One by one each power frequency period in described sampling time window is judged, as G30+H20+M50 > 50000, then judge to create a suspected malfunctions signal at a power frequency period; Continue the number N of the suspected malfunctions signal of statistics in described sampling time window, when N >=9, then judge doubtful arc fault occurs; One by one the power frequency period creating suspected malfunctions signal is judged again, as L40+S30+V30 > 50000, then judge arc fault occurs.
2. low-voltage arc fault detection method as claimed in claim 1, is characterized in that, described sampling time window adopts the sliding time window upgraded continuously.
3. low-voltage arc fault detection method as claimed in claim 1 or 2, is characterized in that, as G30+H20+M50 < 50000, then judge not produce fault-signal at a power frequency period; As L40+S30+V30 < 50000, then judge not produce fault-signal at a power frequency period.
4. low-voltage arc fault detection method as claimed in claim 1 or 2, it is characterized in that, a sampling time window comprises 100 power frequency periods.
5. low-voltage arc fault detection method as claimed in claim 1 or 2, is characterized in that, sampling to the voltage between the live wire of protected circuit and zero line and process obtains high-frequency pulse signal, especially by following process implementation:
By high-frequency coupling circuit, the voltage between the live wire of protected circuit and zero line is sampled, obtain high-frequency current signal; An I/V translation circuit again by being connected to high-frequency coupling circuit secondary side changes high-frequency current signal into high-frequency voltage signal; The high-frequency voltage signal that one I/V translation circuit exports is input to logarithmic detector circuit by bandpass filter and carries out detection acquisition high-frequency pulse signal;
The electric current of protected circuit is sampled and is processed and obtains current half wave signal, particular by following process implementation:
Sampled by the electric current of current transformer to protected circuit, obtain AC current waveform signal; The 2nd I/V translation circuit again by being connected to Current Transformer Secondary side changes this AC current waveform signal into AC voltage waveform signal; The AC voltage waveform signal that 2nd I/V translation circuit exports is by obtaining the current half wave signal being applicable to AD sampling after signal condition.
6. a Low voltage arc fault pick-up unit, is characterized in that, comprising:
High-frequency pulse signal generative circuit, it obtains high-frequency pulse signal for sampling to the voltage between the live wire of protected circuit and zero line and process;
Current half wave signal generating circuit, it obtains current half wave signal for sampling to the electric current of protected circuit and process;
Processing module, it for adding up pulse number G, pulse width and the H of high-frequency pulse signal in each power frequency period and maximum pulse M, and stops rate of change L and V for the coefficient of variation S, zero adding up current half wave in each power frequency period
max, wherein, V=di/dt, in arbitrary power frequency period zero to stop rate of change be that zero difference of stopping changing value that zero of the power frequency period be adjacent stops changing value and this power frequency period stops changing value divided by zero of this power frequency period again;
Described processing module is used for a selected sampling time window thereon, and a sampling time window comprises several power frequency periods;
Described processing module is used for judging each power frequency period in described sampling time window one by one, as G30+H20+M50 > 50000, then judge to create a suspected malfunctions signal at a power frequency period, continue the number N of the suspected malfunctions signal of statistics in described sampling time window, when N >=9, then judge doubtful arc fault occurs, one by one the power frequency period creating suspected malfunctions signal is judged again, as L40+S30+V30 > 50000, then judge arc fault occurs.
7. Low voltage arc fault pick-up unit as claimed in claim 6, is characterized in that, described sampling time window adopts the sliding time window upgraded continuously.
8. Low voltage arc fault pick-up unit as claimed in claims 6 or 7, is characterized in that, as G30+H20+M50 < 50000, then judge not produce fault-signal at a power frequency period; As L40+S30+V30 < 50000, then judge not produce fault-signal at a power frequency period.
9. Low voltage arc fault pick-up unit as claimed in claims 6 or 7, it is characterized in that, a sampling time window comprises 100 power frequency periods.
10. Low voltage arc fault pick-up unit as claimed in claims 6 or 7, it is characterized in that, described high-frequency pulse signal generative circuit comprises for sampling to the voltage between the live wire of protected circuit and zero line and obtain the high-frequency coupling circuit of high-frequency current signal, be connected to the I/V translation circuit for high-frequency current signal being changed into high-frequency voltage signal of high-frequency coupling circuit secondary side, for high-frequency voltage signal being amplified and carrying out the bandpass filter of bandpass filtering and be used for the logarithmic detector circuit that the signal shaping after by bandpass filtering becomes high-frequency pulse signal, described current half wave signal generating circuit comprise for the electric current of protected circuit is sampled and obtain the current transformer of AC current waveform signal, be connected to Current Transformer Secondary side for this AC current waveform signal change into AC voltage waveform signal the 2nd I/V translation circuit and for by AC voltage waveform signal by forming the signal conditioning circuit of current half wave signal being applicable to AD sampling after signal condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510157638.0A CN104793112B (en) | 2015-04-03 | 2015-04-03 | A kind of low-voltage arc fault detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510157638.0A CN104793112B (en) | 2015-04-03 | 2015-04-03 | A kind of low-voltage arc fault detection method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104793112A true CN104793112A (en) | 2015-07-22 |
| CN104793112B CN104793112B (en) | 2017-09-29 |
Family
ID=53558082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510157638.0A Active CN104793112B (en) | 2015-04-03 | 2015-04-03 | A kind of low-voltage arc fault detection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104793112B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629112A (en) * | 2016-02-15 | 2016-06-01 | 珠海派诺科技股份有限公司 | Fault arc detection device and method |
| CN109239560A (en) * | 2018-11-29 | 2019-01-18 | 宁波习羽智能科技有限公司 | Fault arc detection method, device and storage medium |
| CN109345752A (en) * | 2018-12-05 | 2019-02-15 | 合肥能安科技有限公司 | A kind of electrical safety monitoring and pre-alarming method and device |
| CN109975591A (en) * | 2019-03-28 | 2019-07-05 | 漳州市玉山电子制造有限公司 | A kind of exchange clip-on multimeter and its coil-winding method |
| CN110108971A (en) * | 2019-06-26 | 2019-08-09 | 云南电网有限责任公司电力科学研究院 | A kind of arc method for measuring of the overhead bare conductor through trees ground fault |
| CN110716110A (en) * | 2019-10-11 | 2020-01-21 | 威胜集团有限公司 | Electrical safety detection device, detection method and intelligent socket |
| CN111474451A (en) * | 2020-04-26 | 2020-07-31 | 威胜集团有限公司 | Detection method and device for improving fault arc accuracy and readable storage medium |
| CN112398104A (en) * | 2020-11-30 | 2021-02-23 | 云南电网有限责任公司电力科学研究院 | Insulation, arc light, route selection integrated monitoring protection system of distribution network |
| CN113376551A (en) * | 2021-06-23 | 2021-09-10 | 北京市腾河智慧能源科技有限公司 | Method, system, device and storage medium for detecting series fault arc |
| CN114280440A (en) * | 2022-03-04 | 2022-04-05 | 固德威技术股份有限公司 | Photovoltaic direct-current arc fault identification device and method and photovoltaic system |
| CN115372759A (en) * | 2022-10-19 | 2022-11-22 | 国网浙江省电力有限公司温州供电公司 | Cable fault diagnosis system and method for secondary circuit of transformer substation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2177561A (en) * | 1985-07-04 | 1987-01-21 | Terence Frank Hart | Electrical arc fault detector |
| CN101154800A (en) * | 2007-09-29 | 2008-04-02 | 吴为麟 | Method for detecting trouble electric arc and its protecting equipment |
| CN101509950A (en) * | 2009-03-17 | 2009-08-19 | 中国电力科学研究院 | Secondary arc analogue simulation apparatus and method for transmission line |
| US20140168843A1 (en) * | 2012-12-19 | 2014-06-19 | Stmicroelectronics S.R.L. | Arc fault detection equipment and method using low frequency harmonic current analysis |
-
2015
- 2015-04-03 CN CN201510157638.0A patent/CN104793112B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2177561A (en) * | 1985-07-04 | 1987-01-21 | Terence Frank Hart | Electrical arc fault detector |
| CN101154800A (en) * | 2007-09-29 | 2008-04-02 | 吴为麟 | Method for detecting trouble electric arc and its protecting equipment |
| CN101509950A (en) * | 2009-03-17 | 2009-08-19 | 中国电力科学研究院 | Secondary arc analogue simulation apparatus and method for transmission line |
| US20140168843A1 (en) * | 2012-12-19 | 2014-06-19 | Stmicroelectronics S.R.L. | Arc fault detection equipment and method using low frequency harmonic current analysis |
Non-Patent Citations (2)
| Title |
|---|
| 吴其勇 等: "家用空调电弧故障检测装置的研究", 《低压电器》 * |
| 姜斌峰 等: "低压交流电线故障电弧模型研究", 《电力系统及其自动化学报》 * |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629112B (en) * | 2016-02-15 | 2018-04-06 | 珠海派诺科技股份有限公司 | A kind of fault arc detection device and method |
| CN105629112A (en) * | 2016-02-15 | 2016-06-01 | 珠海派诺科技股份有限公司 | Fault arc detection device and method |
| CN109239560A (en) * | 2018-11-29 | 2019-01-18 | 宁波习羽智能科技有限公司 | Fault arc detection method, device and storage medium |
| CN109239560B (en) * | 2018-11-29 | 2021-04-13 | 浙江习羽智能科技有限公司 | Fault arc detection method, device and storage medium |
| CN109345752A (en) * | 2018-12-05 | 2019-02-15 | 合肥能安科技有限公司 | A kind of electrical safety monitoring and pre-alarming method and device |
| CN109975591B (en) * | 2019-03-28 | 2024-02-23 | 漳州市玉山电子制造有限公司 | AC pincerlike multipurpose meter and coil winding method thereof |
| CN109975591A (en) * | 2019-03-28 | 2019-07-05 | 漳州市玉山电子制造有限公司 | A kind of exchange clip-on multimeter and its coil-winding method |
| CN110108971A (en) * | 2019-06-26 | 2019-08-09 | 云南电网有限责任公司电力科学研究院 | A kind of arc method for measuring of the overhead bare conductor through trees ground fault |
| CN110108971B (en) * | 2019-06-26 | 2021-06-25 | 云南电网有限责任公司电力科学研究院 | Arc detection method for tree grounding fault of overhead bare conductor |
| CN110716110A (en) * | 2019-10-11 | 2020-01-21 | 威胜集团有限公司 | Electrical safety detection device, detection method and intelligent socket |
| CN111474451A (en) * | 2020-04-26 | 2020-07-31 | 威胜集团有限公司 | Detection method and device for improving fault arc accuracy and readable storage medium |
| CN112398104A (en) * | 2020-11-30 | 2021-02-23 | 云南电网有限责任公司电力科学研究院 | Insulation, arc light, route selection integrated monitoring protection system of distribution network |
| CN112398104B (en) * | 2020-11-30 | 2023-05-26 | 云南电网有限责任公司电力科学研究院 | Comprehensive monitoring protection system for insulation, arc light and line selection of power distribution network |
| CN113376551B (en) * | 2021-06-23 | 2022-11-08 | 北京市腾河智慧能源科技有限公司 | Method, system, device and storage medium for detecting series fault arc |
| CN113376551A (en) * | 2021-06-23 | 2021-09-10 | 北京市腾河智慧能源科技有限公司 | Method, system, device and storage medium for detecting series fault arc |
| CN114280440A (en) * | 2022-03-04 | 2022-04-05 | 固德威技术股份有限公司 | Photovoltaic direct-current arc fault identification device and method and photovoltaic system |
| CN115372759A (en) * | 2022-10-19 | 2022-11-22 | 国网浙江省电力有限公司温州供电公司 | Cable fault diagnosis system and method for secondary circuit of transformer substation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104793112B (en) | 2017-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104793112A (en) | Low-voltage arc fault detection method and device | |
| Artale et al. | Arc fault detection method based on CZT low-frequency harmonic current analysis | |
| US7282924B1 (en) | Computerized electricity system having an arc fault detecting sub-system | |
| CN103529344B (en) | Method for detecting intermittent high-resistance grounding fault through intermittent detection | |
| Artale et al. | Experimental characterization of series arc faults in AC and DC electrical circuits | |
| CN112505511B (en) | Non-invasive low-voltage fault arc detection and positioning method and system | |
| US8213138B2 (en) | Circuit breaker with arc fault detection and method of operation | |
| CN105223476A (en) | A kind of fault arc detection method based on high-frequency characteristic and device | |
| KR101534774B1 (en) | High voltage distributing board, low voltage distributing board, distributing board, motor contorl board having a function of diagnosing/monitoring high temperature and fire by detecting infrared and ultraviolet and transient earth voltage | |
| CN107132437A (en) | The Operation Condition of Power Transformers method of real-time detected based on power attenuation | |
| CN103592550A (en) | Arc fault detection method and protection device | |
| CN110865278B (en) | Ground fault positioning method based on transient mutation energy capturing method | |
| CN109239558A (en) | A kind of DC Line Fault arc-detection and protective device | |
| CN101718813B (en) | Method for monitoring voltage acquisition circuit of electric power secondary system | |
| CN100387999C (en) | Circuit fault directional detecting and protecting method for power supply system | |
| CN210111945U (en) | Arc fault detection system on direct current side of photovoltaic system | |
| Bao et al. | Research on series arc fault detection based on higher-order cumulants | |
| CN104635128A (en) | Arc fault recognition capability experimental analysis device and experimental analysis method thereof | |
| CN106842013A (en) | The live detection method and device of the contact of breaker ablation degree based on electromagnetic wave | |
| CN111025102B (en) | Low-voltage arc fault detection method and device based on voltage waveform analysis | |
| CN102818990B (en) | Method for evaluating quality of arc-fault circuit-interrupter | |
| CN108761297B (en) | Dry-type air-core reactor partial discharge fault on-line monitoring appearance based on high frequency signal | |
| KR101464246B1 (en) | Arc detection breaker using ZCT | |
| CN110849419A (en) | Method and system for monitoring and diagnosing state of switch cabinet | |
| CN113176478B (en) | Parallel arc detection method for low-voltage distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231030 Address after: Room 509, Comprehensive Building, Software Park, Quanzhou City, No. 300 Xiaxian Road, Fengze District, Quanzhou City, Fujian Province, 362000 Patentee after: Fujian Zhiyu Nengju Technology Co.,Ltd. Address before: Room 419, 4th Floor, Innovation Building, No. 1300 Jimei Avenue, Jimei District, Xiamen City, Fujian Province, 361000 Patentee before: Rhine Si (Xiamen) Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240320 Address after: Room 313A, Jinfeng Building, Information Optoelectronics Park, Xiamen Torch High tech Zone, Xiamen, Fujian Province, 361000 Patentee after: Rhine Si (Xiamen) Technology Co.,Ltd. Country or region after: Zhong Guo Address before: Room 509, Comprehensive Building, Software Park, Quanzhou City, No. 300 Xiaxian Road, Fengze District, Quanzhou City, Fujian Province, 362000 Patentee before: Fujian Zhiyu Nengju Technology Co.,Ltd. Country or region before: Zhong Guo |