CN104793112B - A kind of low-voltage arc fault detection method and device - Google Patents
A kind of low-voltage arc fault detection method and device Download PDFInfo
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Abstract
The invention discloses a kind of low-voltage arc fault detection method and device, including：To the voltage sample between the live wire and zero line by protection circuit and processing obtains high-frequency pulse signal, to by the current sample of protection circuit and processing obtains current half wave signal；A sampling time window is selected, a sampling time window includes several power frequency periods；Each power frequency period in sampling time window is judged one by one, as G30+H20+M50 ＞ 50000, then judges to generate a suspected malfunctions signal in a power frequency period；Continue the number N of suspected malfunctions signal of the statistics in the sampling time window, when N >=9, then judge occur doubtful arc fault；The power frequency period for generating suspected malfunctions signal is judged one by one again, as L40+S30+V30 ＞ 50000, then judges occur arc fault.The present invention carries out arc fault to high-frequency pulse signal and current characteristic analysis and monitored in real time, can effectively distinguish arc fault and interference, reliability is higher, reduces de- action by mistake.
Description
Technical field
It is difficult the present invention relates to low-voltage distribution system arc fault detection field, more particularly to one kind by running current
The low-voltage arc fault detection method and device of waveform change interference.
Background technology
With the fast development of science and technology, Modern Family's electrifing degree is improved constantly, and electrical equipment and household electrical appliance increase severely,
Household electricity is continuously increased, and also more and more frequently, this causes huge loss to the fire incident that electric fault is caused 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 bigger, and up to 46.1%.Arc fault is due to that loose contact, connection loosening, insulation ag(e)ing, fracture etc. cause.
The characteristics of fault electric arc is that electric current may reduce in circuit, but temperature is high, and failure is expanded rapidly, until near lighting can
Combustion things and trigger fire.So this fire triggered by arc fault of prevention is particularly important.
Traditional circuit-breakers for over-current protection and Aftercurrent protection circuit breaker do not have the work of fault electric arc protection typically
With.The current country is to domestic circuit arc fault field also in the research and development stage, although have fewer companies to have been developed that pin
To the arc-fault circuit interrupter of domestic circuit, but it does not start really also in circulation on the market, and its reliability is not yet obtained
Checking well.
At present, China has formulated corresponding technical specification, including national standard for 220V/50HZ power networks《Electrical fire monitoring
System -- the 4th part：Fault electric arc detection device》With《The general requirement of arc fault detection device (AFDD)》, in order that electric
Arc failure detector meets national standard, can detect and distinguish electric arc and normal load interference, and be not in false tripping phenomenon.
Therefore, arc fault detection apparatus and method need further improve, it is to avoid judge by accident.
The content of the invention
For above-mentioned technical problem, it can effectively distinguish generation arc fault the invention provides one kind or load is normal
The low-voltage arc fault detection method disturbed caused by startup, power adjusting etc..
Present invention also offers a kind of Low voltage arc fault detection means.
The technical scheme that the present invention is provided is：
A kind of low-voltage arc fault detection method, including：
Voltage between live wire and zero line by protection circuit is sampled and handled and obtains high-frequency pulse signal, to quilt
The electric current of protection circuit, which is sampled and handled, obtains current half wave signal；
Count pulse number G, pulse width and H and maximum impulse of the high-frequency pulse signal in each power frequency period wide
Spend M；Statistics the coefficient of variation S of current half wave, zero in each power frequency period stop rate of change L and Vmax, wherein, V=di/dt,
Zero in any power frequency period stops rate of change stops for zero not changing value of power frequency period adjacent thereto with the zero of the power frequency period
The difference of changing value again divided by the power frequency period zero stop changing value；
A sampling time window is selected, a sampling time window includes several power frequency periods；
Each power frequency period in the sampling time window is judged one by one, as G30+H20+M50 ＞
50000, then judge to generate a suspected malfunctions signal in a power frequency period；Continue to count in the sampling time window
The number N of suspected malfunctions signal, when N >=9, then judges occur doubtful arc fault；Again one by one to generating suspected malfunctions signal
Power frequency period judged, as L40+S30+V30 ＞ 50000, then judge occur arc fault.
Preferably, in described low-voltage arc fault detection method, the sampling time window is using the cunning continuously updated
Dynamic time window.
Preferably, in described low-voltage arc fault detection method, as G30+H20+M50 ＜ 50000, then sentence
It is scheduled on a power frequency period and does not produce fault-signal；As L40+S30+V30 ＜ 50000, then judge a power frequency week
Phase does not produce fault-signal.
Preferably, in described low-voltage arc fault detection method, a sampling time window includes 100 power frequency weeks
Phase.
Preferably, in described low-voltage arc fault detection method, between the live wire and zero line by protection circuit
Voltage, which is sampled and handled, obtains high-frequency pulse signal, is realized especially by procedure below：
The voltage between the live wire and zero line by protection circuit is sampled by high-frequency coupling circuit, high-frequency electrical is obtained
Flow signal；It is changed into height by being connected to the first I/V translation circuits of high-frequency coupling circuit secondary side by high-frequency current signal again
Frequency voltage signal；The high-frequency voltage signal of first I/V translation circuits output is input to logarithmic detector circuit by bandpass filter
Carry out detection and obtain high-frequency pulse signal；
Current half wave signal is obtained to being sampled and being handled by the electric current of protection circuit, it is real particular by procedure below
It is existing：
The electric current of protected circuit is sampled by current transformer, AC current waveform signals are obtained；Again by even
The AC current waveform signals are changed into AC voltage waveform signals by the 2nd I/V translation circuits for being connected to Current Transformer Secondary side；
The current half wave that the AC voltage waveform signals of 2nd I/V translation circuits output are adapted to AD samplings by being obtained after signal condition is believed
Number.
A kind of Low voltage arc fault detection means, including：
High-frequency pulse signal generative circuit, it is used to sample to the voltage between the live wire and zero line by protection circuit
And processing obtains high-frequency pulse signal；
Current half wave signal generating circuit, it is used to obtain electric current half to being sampled and being handled by the electric current of protection circuit
Ripple signal；
Processing module, its be used to counting pulse number G of the high-frequency pulse signal in each power frequency period, pulse width and
H and maximum pulse M, and for count the current half wave in each power frequency period coefficient of variation S, zero stop rate of change
L and Vmax, wherein, V=di/dt, zero in any power frequency period, which stops rate of change, stops for the zero of power frequency period adjacent thereto and becomes
The zero of change value and the power frequency period stops the difference of changing value again divided by the power frequency period zero stops changing value；
The processing module is used to select a sampling time window thereon, and a sampling time window includes several power frequencies
Cycle；
The processing module works as G30+ for judging one by one each power frequency period in the sampling time window
H20+M50 ＞ 50000, then judge to generate a suspected malfunctions signal in a power frequency period, continue to count described
The number N of suspected malfunctions signal in sampling time window, when N >=9, then judges occur doubtful arc fault, then one by one to producing
The power frequency period of suspected malfunctions signals is judged, as L40+S30+V30 ＞ 50000, then judge to occur electric arc therefore
Barrier.
Preferably, in described Low voltage arc fault detection means, the sampling time window is using the cunning continuously updated
Dynamic time window.
Preferably, in described Low voltage arc fault detection means, as G30+H20+M50 ＜ 50000, then sentence
It is scheduled on a power frequency period and does not produce fault-signal；As L40+S30+V30 ＜ 50000, then judge a power frequency week
Phase does not produce fault-signal.
Preferably, in described Low voltage arc fault detection means, a sampling time window includes 100 power frequency weeks
Phase.
Preferably, in described Low voltage arc fault detection means, the high-frequency pulse signal generative circuit includes using
In the voltage between the live wire and zero line by protection circuit is sampled and obtain high-frequency current signal high-frequency coupling circuit,
It is connected to the first I/V conversion electricity for being used to being changed into high-frequency current signal into high-frequency voltage signal of high-frequency coupling circuit secondary side
Road, for high-frequency voltage signal to be amplified and the bandpass filter of bandpass filtering is carried out and for by the signal after bandpass filtering
It is shaped to the logarithmic detector circuit of high-frequency pulse signal；The current half wave signal generating circuit includes being used for protected circuit
Electric current sampled and obtain the current transformer of AC current waveform signals, be connected to Current Transformer Secondary side be used for should
AC current waveform signals are changed into the 2nd I/V translation circuits of AC voltage waveform signals and for AC voltage waveform signals to be led to
Cross after signal condition and form the signal conditioning circuit for the current half wave signal for being adapted to AD samplings.
The present invention is analyzed high-frequency pulse signal, in conjunction with, to the mutation analysis of current characteristic, synthesis is more in the unit interval
Feature is monitored in real time to carry out arc fault, can effectively distinguish generation arc fault or the normal startup of load, power adjusting
Interference, can monitor fault electric arc with higher reliability Deng caused by, thus reduce the de- action of mistake of device.
Brief description of the drawings
Fig. 1 is the structural representation of one embodiment of Low voltage arc fault detection means of the present invention；
Fig. 2 is the flow chart of one embodiment of low-voltage arc fault detection method of the present invention；
Fig. 3 is the flow chart of microprocessor execution in one embodiment；
Fig. 4 is the sampling flow chart of one embodiment medium-high frequency pulse signal；
Fig. 5 is the sampling flow chart of current half wave signal in one embodiment.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the present invention provides a kind of low-voltage arc fault detection method, including：It is right
Sampled and handled by the voltage between the live wire and zero line of protection circuit and obtain high-frequency pulse signal, to by protection circuit
Electric current, which is sampled and handled, obtains current half wave signal；Count pulse number of the high-frequency pulse signal in each power frequency period
G, pulse width and H and maximum pulse M；Statistics the coefficient of variation S of current half wave, zero in each power frequency period, which stop, to be become
Rate L and Vmax, wherein, V=di/dt, zero in any power frequency period stops zero that rate of change is power frequency period adjacent thereto
Not the zero of changing value and the power frequency period stop changing value difference again divided by the power frequency period zero stop changing value；A selected sampling
Time window, a sampling time window includes several power frequency periods；Each power frequency period in the sampling time window is entered one by one
Row judges, as G30+H20+M50 ＞ 50000, then judges to generate a suspected malfunctions signal in a power frequency period；
Continue the number N of suspected malfunctions signal of the statistics in the sampling time window, when N >=9, then judge occur doubtful electric arc event
Barrier；The power frequency period for generating suspected malfunctions signal is judged one by one again, as L40+S30+V30 ＞ 50000, then
Judge occur arc fault.
Predetermined time cycle (i.e. one power frequency period) captures high-frequency pulse signal, real-time update high-frequency pulse signal
Pulse number G, pulse width and H and maximum pulse M, the final pulse for obtaining high-frequency pulse signal in each power frequency period
Number G, pulse width and H and maximum pulse M.The current half wave of each power frequency period of acquisition is changed by timing A/D
Zero stops changing value, periodic current integrated value and maximum V values (i.e. Vmax), V=di/dt calculates zero and stops rate of change L and periodic current
Coefficient of variation S, wherein, the zero of the power frequency period stops rate of change stops changing value and the work for the zero of power frequency period adjacent thereto
The zero of frequency cycle stop changing value difference again divided by the power frequency period zero stop changing value.Preferably, adjacent power frequency period selection
Latter power frequency period of current power frequency period.In addition, half wave cycles are equal to power frequency period.
Collect multiple high-frequency impulses in a power frequency period, if pulse number, pulse width and, maximum impulse it is wide
Degree ratio and more than threshold value then this be designated as a suspected malfunctions signal, specific formula is：G30+H20+M50 ＞
50000.When suspected malfunctions signal in sampling time window t1Interior accumulative number N judges occur doubtful electric arc event more than eight, that is,
Barrier.Now, for generating the power frequency period of suspected malfunctions signal, if zero stops rate of change L, the coefficient of variation S of periodic current
During with maximum di/dt values V ratio and more than given threshold, then judge occur arc fault, specific formula is：L·40+
S30+V30 ＞ 50000.As long as that is, it is to occur arc fault to have a power frequency period to be determined, turning out whole
Arc fault there occurs by protection circuit really.
When microprocessor judges to occur arc fault, microprocessor triggering trip circuit makes electromechanical interface thread off, and
When 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
Result of determination for storing current demand signal, when current demand signal is determined as non-faulting signal, Temp=0, current demand signal is determined as
During suspected malfunctions signal, Temp=1.Define a length is used to store 100 half wave cycles for 100 integer array D [100]
Result of determination, each half wave cycles are mobile one to a high position by the 0-99 element in array every after judgement, ought
In the lowest order D [0] of preceding Temp values deposit array.Array D [100] is summed, you can draw and add up prison in 100 half wave cycles
The doubtful arcing fault signal number N measured.
Likewise it is possible to using the algorithm of arc fault in similar algorithm statistic sampling time window.Its process is：Definition
One variable True is used for the result of determination for storing current demand signal, when current demand signal is determined as non-faulting signal, True=0, when
When front signal is determined as fault-signal (judging to there occurs arc fault), True=1；Define the integer that a length is 100
Array R [100] is used for the result of determination for storing 100 half wave cycles, after each half wave cycles are judged, by 0- in array
99 elements every are mobile one to a high position, in the lowest order R [0] that current Temp values are stored in array.Array R [100] is asked
With, you can draw the arcing fault signal number N for adding up to monitor in 100 half wave cycles.Due to determining a failure
After signal, the circuit in downstream has just been disconnected, thus actual monitoring to arcing fault signal be one.
Specifically, the above-mentioned calculation to counting doubtful arcing fault signal and arcing fault signal is run on the microprocessor
Method, to realize that arc fault judges.Data, the number of same power frequency period are stored into array D [100] and array R [100] simultaneously
It is identical according to the position in two arrays.When the number of the doubtful arcing fault signal in array D [100] reaches threshold value, if
The Temp numerical value of element of the element that Temp numerical value in array D [100] is 1 in the same position of array R [100] is also 1,
Then judge to there occurs arc fault.
Wherein, " current demand signal " is meant that one section of current half wave signal in a power frequency period, then accordingly,
For " non-faulting signal " and " suspected malfunctions signal " is both for one section of current half wave signal in a power frequency period.
" voltage between the live wire and zero line by protection circuit is sampled and handled and obtains high-frequency pulse signal,
Obtain current half wave signal to being sampled and being handled by the electric current of protection circuit " in " high-frequency pulse signal " and " electric current half
Ripple signal " is then that for whole monitoring process, they have corresponding signal segment in each power frequency period.
The present invention is analyzed high-frequency pulse signal, in conjunction with the unit interval to the mutation analysis of current characteristic, it is comprehensive
Close multiple features to monitor in real time to carry out arc fault, can effectively distinguish generation arc fault or the normal startup of load, power
Disturbed caused by regulation etc., fault electric arc can be monitored with higher reliability, thus reduce the de- action of mistake of device.
In one embodiment, in described low-voltage arc fault detection method, as G30+H20+M50 ＜
50000, then judge not produce fault-signal in a power frequency period；As L40+S30+V30 ＜ 50000, then judge
One power frequency period does not produce fault-signal.
In one embodiment, in described low-voltage arc fault detection method, a sampling time window includes 100 works
The frequency cycle.In order to improve the degree of accuracy and the reliability of judgement, a sampling time window is set to include 100 power frequency periods.
In one embodiment, in described low-voltage arc fault detection method, the sampling time window is used continuously more
New sliding time window.When using the sliding time window continuously updated, data update at any time, when sampling time window
The data of interior current one group of power frequency period (such as 100 power frequency periods) do not determine arc fault, then time-sequencing is most
The data of one group of forward power frequency period move forward one, when the data of a power frequency period of newest generation enter sampling
Between in window, judge positioned at last position, then to the data of this group of current power frequency period, to determine whether to occur electric arc
Failure.
In one embodiment, in described low-voltage arc fault detection method, to by the live wire and zero line of protection circuit
Between voltage sampled and handled and obtain high-frequency pulse signal, realized especially by procedure below：Pass through high-frequency coupling electricity
Road is sampled to the voltage between the live wire and zero line by protection circuit, obtains high-frequency current signal；Again by being connected to height
High-frequency current signal is changed into high-frequency voltage signal by the first I/V translation circuits of frequency termination power secondary side；First I/V is converted
The high-frequency voltage signal of circuit output is input to logarithmic detector circuit by bandpass filter and carries out detection acquisition high-frequency impulse letter
Number.Current half wave signal is obtained to being sampled and being handled by the electric current of protection circuit, is realized particular by procedure below：It is logical
Overcurrent transformer is sampled to the electric current of protected circuit, obtains AC current waveform signals；It is mutual by being connected to electric current again
The AC current waveform signals are changed into AC voltage waveform signals by the 2nd I/V translation circuits of sensor secondary side；2nd I/V is converted
The AC voltage waveform signals of circuit output are adapted to the current half wave signal of AD samplings by being obtained after signal condition.
Referring to Fig. 1, present invention also offers a kind of Low voltage arc fault detection means, including：High-frequency pulse signal is given birth to
Into circuit, it, which is used to sample to the voltage between the live wire and zero line by protection circuit and handled, obtains high-frequency impulse letter
Number；Current half wave signal generating circuit, it is used to obtain current half wave letter to being sampled and being handled by the electric current of protection circuit
Number；Processing module, its be used to counting pulse number G, pulse width and H of the high-frequency pulse signal in each power frequency period and
Maximum pulse M, and for count the current half wave in each power frequency period coefficient of variation S, zero stop rate of change L and
Vmax, wherein, V=di/dt, zero in any power frequency period stops rate of change stops changing value for the zero of power frequency period adjacent thereto
And the zero of the power frequency period stop changing value difference again divided by the power frequency period zero stop changing value；The processing module is used at it
Upper to select a sampling time window, a sampling time window includes several power frequency periods；It is right one by one that the processing module is used for
Each power frequency period in the sampling time window is judged, as G30+H20+M50 ＞ 50000, is then judged at one
Power frequency period generates a suspected malfunctions signal, continues to count the number of the suspected malfunctions signal in the sampling time window
N, when N >=8, then judges occur doubtful arc fault, then the power frequency period for generating suspected malfunctions signal is judged one by one,
As L40+S30+V30 ＞ 50000, then judge occur arc fault.
Processing module can select microprocessor, also select it is any can be with the module of computing deterministic process, device etc..
In one embodiment, in described Low voltage arc fault detection means, as G30+H20+M50 ＜
50000, then judge not produce fault-signal in a power frequency period；As L40+S30+V30 ＜ 50000, then judge
One power frequency period does not produce fault-signal.
In one embodiment, in described Low voltage arc fault detection means, a sampling time window includes 100 works
The frequency cycle.
In one embodiment, in described Low voltage arc fault detection means, the sampling time window is used continuously more
New sliding time window.When using the sliding time window continuously updated, data update at any time, when sampling time window
The data of interior current one group of power frequency period (such as 100 power frequency periods) do not determine arc fault, then time-sequencing is most
The data of one group of forward power frequency period move forward one, when the data of a power frequency period of newest generation enter sampling
Between in window, judge positioned at last position, then to the data of this group of current power frequency period, to determine whether to occur electric arc
Failure.
In one embodiment, in described Low voltage arc fault detection means, the high-frequency pulse signal generative circuit
Including the high frequency coupling for high-frequency current signal to be sampled and obtained to the voltage between the live wire and zero line by protection circuit
Close circuit, be connected to the first I/ for being used to being changed into high-frequency current signal into high-frequency voltage signal of high-frequency coupling circuit secondary side
V translation circuits, for high-frequency voltage signal to be amplified and the bandpass filter of bandpass filtering is carried out and for by bandpass filtering
Logarithmic detector circuit of the signal shaping afterwards into high-frequency pulse signal.The current half wave signal generating circuit includes being used for quilt
The electric current of protection circuit is sampled and obtains the current transformer of AC current waveform signals, is connected to Current Transformer Secondary side
The AC current waveform signals that are used for be changed into the 2nd I/V translation circuits of AC voltage waveform signals and for by AC voltage waves
Shape signal is adapted to the signal conditioning circuit for the current half wave signal that AD samples by being formed after signal condition.
Further, the first I/V translation circuits and second/V translation circuits can use build-out resistor.The logarithm
Detecting circuit uses number detector amplifier.The signal conditioning circuit includes amplifying circuit, low-pass filter circuit and addition electricity
Road.The Low voltage arc fault detection means also includes the power circuit for being connected to microprocessor and being powered to device.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the art
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, the present invention is not limited
In specific details and shown here as the legend with description.
Claims (10)
1. a kind of low-voltage arc fault detection method, it is characterised in that including：
Voltage between live wire and zero line by protection circuit is sampled and handled and obtains high-frequency pulse signal, to being protected
The electric current of circuit, which is sampled and handled, obtains current half wave signal；
Count pulse number G, pulse width and H and maximum pulse M of the high-frequency pulse signal in each power frequency period；
Statistics the coefficient of variation S of current half wave, zero in each power frequency period stop rate of change L and maximum di/dt values V, any power frequency
Zero in cycle stop rate of change for the zero of power frequency period adjacent thereto stop the zero of changing value and the power frequency period stop changing value it
Difference again divided by the power frequency period zero stop changing value；
A sampling time window is selected, a sampling time window includes several power frequency periods；
Each power frequency period in the sampling time window is judged one by one, as G30+H20+M50 ＞ 50000, then
Judgement generates a suspected malfunctions signal in a power frequency period；Continue to count the suspected malfunctions in the sampling time window
The number N of signal, when N >=9, then judges occur doubtful arc fault；It is all to generating the power frequency of suspected malfunctions signal one by one again
Phase is judged, as L40+S30+V30 ＞ 50000, then judges occur arc fault.
2. low-voltage arc fault detection method as claimed in claim 1, it is characterised in that the sampling time window is using continuous
The sliding time window of renewal.
3. low-voltage arc fault detection method as claimed in claim 1 or 2, it is characterised in that work as G30+H20+M50
＜ 50000, then judge not produce fault-signal in a power frequency period；As L40+S30+V30 ＜ 50000, then judge
Fault-signal is not produced in a power frequency period.
4. low-voltage arc fault detection method as claimed in claim 1 or 2, it is characterised in that a sampling time window is included
100 power frequency periods.
5. low-voltage arc fault detection method as claimed in claim 1 or 2, it is characterised in that to by the live wire of protection circuit
Voltage between zero line, which is sampled and handled, obtains high-frequency pulse signal, is realized especially by procedure below：
The voltage between the live wire and zero line by protection circuit is sampled by high-frequency coupling circuit, high frequency electric letter is obtained
Number；It is changed into high-frequency electrical by being connected to the first I/V translation circuits of high-frequency coupling circuit secondary side by high-frequency current signal again
Press signal；The high-frequency voltage signal of first I/V translation circuits output is input to logarithmic detector circuit by bandpass filter and carried out
Detection obtains high-frequency pulse signal；
Current half wave signal is obtained to being sampled and being handled by the electric current of protection circuit, is realized particular by procedure below：
The electric current of protected circuit is sampled by current transformer, AC current waveform signals are obtained；Again by being connected to
The AC current waveform signals are changed into AC voltage waveform signals by the 2nd I/V translation circuits of Current Transformer Secondary side；Second
The AC voltage waveform signals of I/V translation circuits output are adapted to the current half wave signal of AD samplings by being obtained after signal condition.
6. a kind of Low voltage arc fault detection means, it is characterised in that including：
High-frequency pulse signal generative circuit, it is used to the voltage between the live wire and zero line by protection circuit is sampled and located
Reason obtains high-frequency pulse signal；
Current half wave signal generating circuit, it is used to obtain current half wave letter to being sampled and being handled by the electric current of protection circuit
Number；
Processing module, its be used to counting pulse number G, pulse width and H of the high-frequency pulse signal in each power frequency period with
And maximum pulse M, and for count the current half wave in each power frequency period coefficient of variation S, zero stop rate of change L with
And maximum di/dt values V, zero in any power frequency period stop rate of change for the zero of power frequency period adjacent thereto stop changing value with should
The zero of power frequency period stop changing value difference again divided by the power frequency period zero stop changing value；
The processing module is used to select a sampling time window thereon, and a sampling time window includes several power frequencies week
Phase；
The processing module works as G30+H20+ for judging one by one each power frequency period in the sampling time window
M50 ＞ 50000, then judge to generate a suspected malfunctions signal in a power frequency period, continue to count in the sampling
Between suspected malfunctions signal in window number N, when N >=9, then judge occur doubtful arc fault, then doubtful to generating one by one
The power frequency period of fault-signal is judged, as L40+S30+V30 ＞ 50000, then judges occur arc fault.
7. Low voltage arc fault detection means as claimed in claim 6, it is characterised in that the sampling time window is using continuous
The sliding time window of renewal.
8. Low voltage arc fault detection means as claimed in claims 6 or 7, it is characterised in that work as G30+H20+M50
＜ 50000, then judge not produce fault-signal in a power frequency period；As L40+S30+V30 ＜ 50000, then judge
Fault-signal is not produced in a power frequency period.
9. Low voltage arc fault detection means as claimed in claims 6 or 7, it is characterised in that a sampling time window is included
100 power frequency periods.
10. Low voltage arc fault detection means as claimed in claims 6 or 7, it is characterised in that the high-frequency pulse signal life
Include being used to sampling to the voltage between the live wire and zero line by protection circuit and obtaining high-frequency current signal into circuit
High-frequency coupling circuit, be connected to high-frequency coupling circuit secondary side be used for high-frequency current signal is changed into high-frequency voltage signal
First I/V translation circuits, for high-frequency voltage signal to be amplified and the bandpass filter of bandpass filtering is carried out and for by band
The logarithmic detector circuit of signal shaping after pass filter into high-frequency pulse signal；The current half wave signal generating circuit includes using
Sampled in the electric current to protected circuit and obtain the current transformer of AC current waveform signals, be connected to current transformer
The AC current waveform signals that are used for of secondary side are changed into the 2nd I/V translation circuits of AC voltage waveform signals and for by AC
Voltage waveform signal is adapted to the signal conditioning circuit for the current half wave signal that AD samples by being formed after signal condition.
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| 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 |
| 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 |
| 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 | An arc detection method for grounding faults of overhead bare conductors through trees |
| 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 |
| 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 |
| CN114280440B (en) * | 2022-03-04 | 2022-06-28 | 固德威技术股份有限公司 | Photovoltaic direct-current arc fault identification device, identification method and photovoltaic system |
| CN115372759B (en) * | 2022-10-19 | 2023-04-11 | 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 |
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