CN109061415A - A kind of fault arc detection method and device, computer installation, computer readable storage medium - Google Patents
A kind of fault arc detection method and device, computer installation, computer readable storage medium Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention provides a kind of fault arc detection method and device, computer installation, computer readable storage medium, this method comprises: obtaining sensed current signal；Sensed current signal is sampled with preset sample frequency, obtains current sampling signal；According to the flat shoulder judgement that carries out of the current sampling signal of half wave cycles multiple in sensed current signal, there is the flat shoulder quantity of the half wave cycles of flat shoulder in statistics；When shoulder quantity flat in preset duration is more than the first preset quantity, issues fault electric arc and protect signal.The device provides execution module for this method.Computer installation has processor, and above-mentioned fault arc detection method may be implemented when executing program in processor.Computer-readable recording medium storage has computer program, to realize above-mentioned fault arc detection method.The present invention can effectively judge rapidly that simultaneously effective protection circuit occurs for pure resistive loads fault electric arc.
Description
Technical field
The present invention relates to circuit arc-detection technical fields, specifically, being related to fault arc detection method, further relate to apply
The fault arc detection device of this method.A kind of computer installation for realizing the above method is further related to, further relating to can be real
The computer readable storage medium of the existing above method.
Background technique
With the development of society, electric appliance with more and more extensive.Electric appliance circuits or equipment due to electric wire insulation layer aging,
The reasons such as damaged or electric appliance circuits bad connection, may cause electric appliance circuits or device fails electric arc, all so as to cause fire
The generation of calamity.In low pressure power and distribution supply cable, there are series connection, Line To Line, line three classes arc fault over the ground.Serial arc is due to its electricity
When arc failure occurs, electric current is small compared with other two kinds of electric arcs, and the characteristic of fault electric arc is with loadtype and load
The influence of size variation and be more difficult to detect, thus also have more risk.
In existing household electrical appliance, purely resistive load electric appliance using relatively broad, therefore, it is necessary to be directed to purely resistive load
Electric appliance carries out targetedly fault electric arc and detects, to more effectively protect purely resistive load circuit.
Summary of the invention
The first object of the present invention, which is to provide one kind, can effectively judge rapidly that pure resistive loads fault electric arc occurs simultaneously
The fault arc detection method of effective protection circuit.
The second object of the present invention, which is to provide one kind, can effectively judge rapidly that pure resistive loads fault electric arc occurs simultaneously
The fault arc detection device of effective protection circuit.
The third object of the present invention, which is to provide one kind, can effectively judge rapidly that pure resistive loads fault electric arc occurs simultaneously
The computer installation of effective protection circuit.
The fourth object of the present invention, which is to provide one kind, can effectively judge rapidly that pure resistive loads fault electric arc occurs simultaneously
The computer readable storage medium of effective protection circuit.
In order to realize above-mentioned first purpose, fault arc detection method provided by the invention includes: to obtain detection electric current letter
Number；Sensed current signal is sampled with preset sample frequency, obtains current sampling signal；According to more in sensed current signal
The current sampling signal of a half wave cycles carries out flat shoulder judgement, and the flat shoulder number of the half wave cycles of flat shoulder occurs in statistics
Amount；When shoulder quantity flat in preset duration is more than the first preset quantity, issues fault electric arc and protect signal.
By above scheme it is found that in normal work due to purely resistive load circuit, not flat shoulder at current over-zero, and
Break down electric arc when have flat shoulder, can determine whether circuit breaks down electric arc according to this feature.In the present invention, by inspection
The judgement for carrying out flat shoulder of the multiple half wave cycles of current signal is surveyed, meanwhile, occur the half-wave of flat shoulder in statistics preset duration
Amount of cycles issues protection signal, then when being more than certain amount so as to further protect to circuit.Event of the invention
It is simple and fast to hinder arc method for measuring, can quickly react to fault electric arc.
In further embodiment, according to the current sampling signal of half wave cycles multiple in the sensed current signal
Carry out flat shoulder judgement, comprising: obtain the flat shoulder that pre-set current value range is in the current sampling signal of current half wave cycles
Portion's current sampling signal；Judge whether the quantity for flat shoulder current sampling signal continuously occur is greater than or equal to the second preset quantity
And be more than to preset effective current value there are current absolute value in all current sampling signals, if so, determining current half wave cycles
Sensed current signal there is flat shoulder.
It can be seen that according to the characteristic of purely resistive load circuit, break down electric arc when current over-zero at flat shoulder meeting
Continue one section of duration, by flat shoulder current sampling signal of the pre-set current value range judgement in flat shoulder and by being preset with
Whether in running order current value decision circuitry is imitated, so that it is determined that whether current sampling signal flat shoulder occurs.
In further embodiment, the second preset quantity is according to each half-wave in preset sample frequency and sensed current signal
The time duration that flat shoulder occurs in period is configured.
It can be seen that since the quantity for flat shoulder current sampling signal continuously occur is according to the duration for flat shoulder occur
The change of length and sample frequency and change, so the second preset quantity is according in preset sample frequency and sensed current signal
The time duration that flat shoulder occurs in each half wave cycles is configured, and to adapt to judgment criteria, makes to judge more accurate.
It is described to be believed according to the current sample of half wave cycles multiple in the sensed current signal in further embodiment
Number carry out flat shoulder judgement, comprising: adopted according to all electric currents of each half wave cycles in the sensed current signal
Sample signal carries out flat shoulder judgement.
It can be seen that by all current sampling signals to each half wave cycles carry out the judgement of flat shoulder can
Improve the accuracy of detection.
In order to realize above-mentioned second purpose, fault arc detection device provided by the invention includes: that electric current obtains module, is used
In acquisition sensed current signal；Current sampling module is obtained for being sampled with preset sample frequency to sensed current signal
Current sampling signal；Flat shoulder judgment module, for the current sampling signal according to half wave cycles multiple in sensed current signal
Carry out flat shoulder judgement, there is the flat shoulder quantity of the half wave cycles of flat shoulder in statistics；Fault determination module works as preset duration
When interior flat shoulder quantity is more than the first preset quantity, issues fault electric arc and protect signal.
By above scheme as it can be seen that in normal work due to purely resistive load circuit, not flat shoulder at current over-zero, and
Break down electric arc when have flat shoulder, can determine whether circuit breaks down electric arc according to this feature.In the present invention, by inspection
The judgement for carrying out flat shoulder of the multiple half wave cycles of current signal is surveyed, meanwhile, occur the half-wave of flat shoulder in statistics preset duration
Amount of cycles issues protection signal, then when being more than certain amount so as to further protect to circuit.Event of the invention
It is simple and fast to hinder arc method for measuring, can quickly react to fault electric arc.
In order to realize above-mentioned third purpose, computer installation provided by the invention includes for detecting purely resistive load circuit
Fault electric arc detection circuit, fault electric arc detection circuit includes processor, which stores for executing in memory
Computer program when realize each step of above-mentioned fault arc detection method.
In order to realize above-mentioned 4th purpose, computer readable storage medium provided by the invention is stored thereon with computer
Program, and when computer program is executed by processor, realizes each step of above-mentioned fault arc detection method.
Detailed description of the invention
Fig. 1 is the flow chart of fault arc detection method embodiment of the present invention.
Fig. 2 is current waveform when purely resistive load circuit works normally in fault arc detection method embodiment of the present invention
Schematic diagram.
Electric current when Fig. 3 is purely resistive load circuit malfunctions electric arc in fault arc detection method embodiment of the present invention
Waveform diagram.
Fig. 4 is the flow chart of flat shoulder judgment step in fault arc detection method embodiment of the present invention.
Fig. 5 is the structural block diagram of fault arc detection device embodiment of the present invention.
Fig. 6 is the circuit structure diagram of fault electric arc detection circuit in computer installation embodiment of the present invention.
The invention will be further described with reference to the accompanying drawings and embodiments.
Specific embodiment
Fault arc detection method of the invention is applied on the terminal device of detection purely resistive load circuit, fault electric arc
Detection method can be realized by judging detection electric current determine whether purely resistive load circuit breaks down electric arc.This hair
Bright fault arc detection device is for realizing above-mentioned fault arc detection method.Also, the present invention also provides a kind of calculating
Machine device, the computer installation include processor, and processor can be with the instruction of executing application, to realize above-mentioned failure
Each step of arc method for measuring.Computer program is provided on the computer readable storage medium of offer of the invention, and
Each step of above-mentioned fault arc detection method is realized when computer program is executed by processor.
Fault arc detection method embodiment:
As shown in Figure 1, fault arc detection method of the invention, when carrying out fault electric arc detection, prime minister executes step S1, obtain
Take sensed current signal.When obtaining current signal, the current signal that can be obtained in purely resistive load circuit by external circuit is made
For sensed current signal.
After getting sensed current signal, step S2 is executed, sensed current signal is sampled with preset sample frequency,
Obtain current sampling signal.Preset sample frequency can be as needed or according to the flat shoulder of appearance in practical purely resistive load circuit
Actual current size and time duration are configured.For example, there is the reality of flat shoulder in a certain purely resistive load circuit kind
Border size of current is in the range of -0.1A to 0.1A, and flat shoulder duration is 1.6ms, then carries out to sample frequency
When determining, the speed of the accuracy and detection that can measure as needed accounts for being arranged, and in the present embodiment, presets sampling frequency
Rate is 5KHz.
After obtaining current sampling signal, step S3 is executed, is adopted according to the electric current of half wave cycles multiple in sensed current signal
Sample signal carries out flat shoulder judgement, and the flat shoulder quantity of the half wave cycles of flat shoulder occurs in statistics.By Fig. 2 and Fig. 3 it is found that pure
In normal work, current signal is generally normal sinusoidal current signal, not flat shoulder at current over-zero to resistive load circuit
Portion, and break down electric arc when can occur flat shoulder, and break down electric arc when, sensed current signal can duration appearance
Flat shoulder.Therefore, flat shoulder judgement is carried out by the current sampling signal to multiple half wave cycles, determines each half-wave week
Phase whether there is flat shoulder, and by the carry out quantity statistics to the half wave cycles for flat shoulder occur, further to judge to be
No needs take measures.Preferably, described to be believed according to the current sample of half wave cycles multiple in the sensed current signal
Number carry out flat shoulder judgement, comprising: adopted according to all electric currents of each half wave cycles in the sensed current signal
Sample signal carries out flat shoulder judgement.Certainly, the judgement for carrying out compartment to the half wave cycles in sensed current signal can also be with
It achieves the object of the present invention, for example, only being detected to the half wave cycles in rising edge, or only to the half-wave week of failing edge
Phase is detected, or is detected the current sampling signal at interval of a complete cycle (that is, to first complete week
After phase detection, second complete cycle is skipped, third complete cycle is detected, is so analogized) etc..
Referring to fig. 4, sentence in the flat shoulder that carries out of the current sampling signal according to half wave cycles multiple in sensed current signal
When disconnected, step S31 is executed, obtains the flat shoulder electricity in the current sampling signal of current half wave cycles in pre-set current value range
Flow sampled signal.After getting current sampling signal, the current sampling signal of the current half wave cycles detected is sentenced
It is disconnected, judge whether current sampling signal is the flat shoulder current sampling signal in pre-set current value range.Pre-set current value model
Enclose can shoulder flat according to appearance in practical purely resistive load circuit when actual current size be configured.For example, a certain pure resistance
There is the actual current size of flat shoulder in the range of -0.2A to 0.2A in property load circuit kind, then can be by pre-set current value model
It encloses and is arranged in the range of -0.2A to 0.2A.
After obtaining flat shoulder current sampling signal, step S32 is executed, flat shoulder current sampling signal continuously occurs in judgement
It is more than default effective that whether quantity, which is greater than or equal in the second preset quantity and all current sampling signals there are current absolute value,
Current value.Wherein, the second preset quantity is put down according to each half wave cycles in preset sample frequency and sensed current signal
The time duration of shoulder is configured, for example, if the flat shoulder of each half wave cycles appearance is held in sensed current signal
Continuous time span is 1.6ms, the flat shoulder current sampling signal that can be obtained in preset sample frequency 10KHz, 1.6ms are as follows:
0.0016s × 10K+1=17；If the flat shoulder time duration of each half wave cycles appearance is in sensed current signal
0.6ms is the flat shoulder of failure, the flat shoulder current sample that can be obtained in preset sample frequency 10KHz, 0.6ms in range
Signal are as follows: 0.0006s × 10K+1=7.In the present embodiment, the second preset quantity is 9.
After obtaining flat shoulder current sampling signal, the quantity of flat shoulder current sampling signal is counted.Flat shoulder electricity
The quantity of stream sampled signal is counted by the way of progressively increasing, that is, judges that a certain current sampling signal is adopted for flat shoulder electric current
Then the quantity of flat shoulder current sampling signal adds one after sample signal.
In addition, the sensed current signal in order to ensure current detection is in effective working condition of purely resistive load circuit,
Therefore, it need to judge that whether there is current absolute value in all current sampling signals is more than to preset effective current value.Wherein, it is preset with
Effect current value is configured according to current effective value when actually operating normally in purely resistive load circuit.In the present embodiment, in advance
If current effective value is 0.35A.
When the quantity that flat shoulder current sampling signal continuously occurs in judgement is greater than or equal to the second preset quantity and all electricity
When there are current absolute values more than effective current value is preset in stream sampled signal, step S33 is executed, determines current half wave cycles
There is flat shoulder in sensed current signal.When the quantity of flat shoulder current sampling signal is greater than or equal to the second preset quantity, then
Illustrate that the sensed current signal of current half wave cycles meets the time duration of flat shoulder, at this point, all current sampling signals
In if it exists current absolute value be more than preset effective current value, then can determine that the sensed current signal of current half wave cycles is put down
Shoulder.When execution step S32 is judged as NO, then returns and continue to execute step S31.
When there is flat shoulder in the sensed current signal of the current half wave cycles of determination, to the half wave cycles for flat shoulder occur into
There is the flat shoulder quantity of the half wave cycles of flat shoulder in row quantity statistics, statistics.Flat shoulder quantity is carried out by the way of progressively increasing
Statistics, that is, then flat shoulder quantity adds one when flat shoulder occurs in the sensed current signal of half wave cycles before judging.
After the flat shoulder quantity of the half wave cycles of flat shoulder occurs in statistics, step S4 is executed, judges flat shoulder in preset duration
Whether portion's quantity is more than the first preset quantity.Wherein, preset duration and the first preset quantity can be set according to relevant criterion,
For example, being 8 according to half wave number of maximum fault electric arc allowed in GB/T31143 standard requirements 0.5s, therefore, by preset duration
It is set as 0.5 second, the first preset quantity is set as 8.
When judging that flat shoulder quantity is more than the first preset quantity in preset duration, step S5 is executed, issues fault electric arc
Protect signal.The electric arc that breaks down then is thought when judging that flat shoulder quantity is more than the first preset quantity in preset duration, is needed
It takes measures to it, therefore, issues fault electric arc protection signal progress purely resistive load circuit and protected.Fault electric arc protection
Signal can be signal or the alarm alert signal etc. that dump is carried out to purely resistive load circuit, can be to pure resistance
Property load circuit is preferably protected.When judging that flat shoulder quantity is not above the first preset quantity in preset duration, then returns
It returns and continues to execute step S3, continue to count flat shoulder quantity.
Fault arc detection device embodiment:
As shown in figure 5, fault arc detection device of the invention includes that electric current obtains module 1, current sampling module 2, flat shoulder
Judgment module 3 and fault determination module 4.
Electric current obtains module 1 for obtaining sensed current signal.When obtaining current signal, it can be obtained by external circuit pure
Current signal in resistive load circuit is as sensed current signal.
Current sampling module 2 obtains current sample letter for sampling with preset sample frequency to sensed current signal
Number.Preset sample frequency can as needed or according to the flat shoulder actual current size of appearance in practical purely resistive load circuit with
And time duration is configured.
Flat shoulder judgment module 3 is used for the progress of the current sampling signal according to half wave cycles multiple in sensed current signal
There is the flat shoulder quantity of the half wave cycles of flat shoulder in flat shoulder judgement, statistics.Pass through the current sample to multiple half wave cycles
Signal carries out flat shoulder judgement, determines that each half wave cycles with the presence or absence of flat shoulder, and passes through to occurring the half of flat shoulder
The carry out quantity statistics of wave period, to further determine whether to need to take measures.Preferably, described according to the detection electricity
The current sampling signal of multiple half wave cycles carries out flat shoulder judgement in stream signal, comprising: according to the detection electric current
All current sampling signals of each half wave cycles carries out flat shoulder judgement in signal.Certainly, to detection electric current letter
The purpose of the present invention also may be implemented in the judgement that half wave cycles in number carry out compartment, for example, only to half in rising edge
Wave period is detected, or is only detected to the half wave cycles of failing edge, or at interval of complete cycle
Current sampling signal detected (that is, after detecting to first complete cycle, skip second complete cycle, it is complete to third
Complete cycle is detected, and so analogizes) etc..
Flat shoulder judgment module 3 carries out flat shoulder according to the current sampling signals of half wave cycles multiple in sensed current signal
The step of portion judges includes: to obtain the flat shoulder that pre-set current value range is in all current sampling signals of current half wave cycles
Portion's current sampling signal；Judge whether the quantity for flat shoulder current sampling signal continuously occur is greater than or equal to the second preset quantity
And be more than to preset effective current value there are current absolute value in all current sampling signals, if so, determining current half wave cycles
Sensed current signal there is flat shoulder.
After getting current sampling signal, flat shoulder judgment module 3 to the current half wave cycles detected each
Current sampling signal is judged judge whether current sampling signal is the flat shoulder current sample in pre-set current value range
Signal.Pre-set current value range can shoulder flat according to appearance in practical purely resistive load circuit when actual current size set
It sets.
After obtaining flat shoulder current sampling signal, flat shoulder judgment module 3 judges flat shoulder current sample letter continuously occur
Number quantity whether be greater than or equal in the second preset quantity and all current sampling signals there are current absolute value be more than default
Effective current value.Wherein, the second preset quantity goes out according to each half wave cycles in preset sample frequency and sensed current signal
Now the time duration of flat shoulder is configured.
After obtaining flat shoulder current sampling signal, flat shoulder judgment module 3 to the quantity of flat shoulder current sampling signal into
Row statistics.The quantity of flat shoulder current sampling signal is counted by the way of progressively increasing, that is, judges a certain current sampling signal
For then the quantity of flat shoulder current sampling signal adds one after flat shoulder current sampling signal.
In addition, the sensed current signal in order to ensure current detection is in effective working condition of purely resistive load circuit,
Therefore, flat shoulder judgment module 3 need to judge in all current sampling signals with the presence or absence of current absolute value more than default effectively electricity
Flow valuve.Wherein, effective current value is preset to be set according to current effective value when actually operating normally in purely resistive load circuit
It sets.
When flat shoulder judgment module 3 judges that the quantity for flat shoulder current sampling signal continuously occur is greater than or equal to second in advance
If there are current absolute values more than effective current value is preset in quantity and all current sampling signals, flat shoulder judgment module 3
Determine that flat shoulder occurs in the sensed current signal of current half wave cycles.When the quantity of flat shoulder current sampling signal is greater than or equal to
When the second preset quantity, then illustrate that the sensed current signal of current half wave cycles meets the time duration of flat shoulder, at this point,
Current absolute value is more than to preset effective current value if it exists in all current sampling signals, then can determine the inspection of current half wave cycles
It surveys current signal and flat shoulder occurs.
When flat shoulder occurs in the sensed current signal of the current half wave cycles of determination, 3 pairs of flat shoulder judgment module is put down
The half wave cycles of shoulder carry out quantity statistics, and the flat shoulder quantity of the half wave cycles of flat shoulder occurs in statistics.Flat shoulder quantity is adopted
It is counted with the mode progressively increased, that is, then flat shoulder quantity when flat shoulder occurs in the sensed current signal of half wave cycles before judging
Add one.
Fault determination module 4 is used to issue failure electricity when shoulder quantity flat in preset duration is more than the first preset quantity
Arc protects signal.After the flat shoulder quantity of the half wave cycles of flat shoulder occurs in statistics, fault determination module 4 judges in preset duration
Whether flat shoulder quantity is more than the first preset quantity.Wherein, preset duration and the first preset quantity can be carried out according to relevant criterion
Setting.When fault determination module 4 judges that flat shoulder quantity is more than the first preset quantity in preset duration, issues fault electric arc and protect
Protect signal.The electric arc that breaks down then is thought when judging in preset duration that flat shoulder quantity is more than the first preset quantity, is needed pair
It takes measures, and therefore, fault determination module 4 issues fault electric arc protection signal progress purely resistive load circuit and protected.
Fault electric arc protection signal can be the signal or alarm alert signal that dump is carried out to purely resistive load circuit
Deng can preferably be protected to purely resistive load circuit.
Computer installation embodiment:
As shown in fig. 6, the computer installation of the present embodiment includes detecting electricity for detecting the fault electric arc of purely resistive load circuit
Road, fault electric arc detection circuit include processor 10, current transformer 20, signal amplification circuit 30 and low-pass filter circuit 40,
Current transformer 20 is electrically connected with the input terminal of signal amplification circuit 30, output end and the low-pass filtering electricity of signal amplification circuit 30
The input terminal on road 40 is electrically connected, and the output end of low-pass filter circuit 40 is electrically connected with processor 10.Purely resistive load circuit includes
Alternating current source 50 and purely resistive load 60, alternating current source 50 and purely resistive load 60 are electrically connected.Current transformer 20 obtains
The detection electric current of purely resistive load circuit, and processing is amplified by 30 pairs of detection electric currents of signal amplification circuit, it is amplified
It detects electric current and low-pass filtering is carried out by low-pass filter circuit 40, filter out the radio-frequency component in detection electric current.By low-pass filtering
Detection electric current be sent to processor 10 and detected, to judge whether purely resistive load circuit breaks down electric arc.
Processor 10 realizes the step in above-mentioned fault arc detection method embodiment when executing computer program.Alternatively,
Processor 10 realizes the function of each module in above-mentioned fault arc detection device embodiment when executing computer program.
For example, computer program can be divided into one or more modules, one or more module, which is stored in, is deposited
It in reservoir, and is executed by processor, to complete the present invention.One or more modules can be the system that can complete specific function
Column count machine program instruction section, the instruction segment is for describing implementation procedure of the computer program in computer installation.
Computer installation may include, but be not limited only to, processor 10, memory.It will be understood by those skilled in the art that meter
Calculation machine device may include more or fewer components, perhaps combine certain components or different components, such as computer dress
Setting can also include input-output equipment, network access equipment, bus etc..
For example, processor 10 can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic device
Part, discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processing
Device etc..Processor 10 is the control centre of computer installation, utilizes each of various interfaces and the entire computer installation of connection
A part.
Memory can be used for storing computer program and/or module, and processor is stored in memory by operation or execution
Interior computer program and/or module, and the data being stored in memory are called, realize the various function of computer installation
Energy.For example, memory can mainly include storing program area and storage data area, wherein storing program area can storage program area,
Application program needed at least one function (such as sound receive capabilities, sound are converted into literal function etc.) etc.；Storing data
Area, which can be stored, uses created data (such as audio data, text data etc.) etc. according to mobile phone.In addition, memory can be with
It can also include nonvolatile memory, such as hard disk, memory, plug-in type hard disk, intelligence including high-speed random access memory
Energy storage card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card, flash card (Flash
Card), at least one disk memory, flush memory device or other volatile solid-state parts.
Computer readable storage medium embodiment:
If the integrated module of the computer installation of above-described embodiment is realized in the form of SFU software functional unit and as independent
Product when selling or using, can store in a computer readable storage medium.Based on this understanding, above-mentioned event is realized
Hinder arc method for measuring embodiment in all or part of the process, can also be instructed by computer program relevant hardware come
It completes, computer program can be stored in a computer readable storage medium, which, can when being executed by processor
The step of realizing above-mentioned fault arc detection method embodiment.Wherein, computer program includes computer program code, computer
Program code can be source code form, object identification code form, executable file or certain intermediate forms etc..Storage medium can be with
Include: can carry computer program code any entity or device, recording medium, USB flash disk, mobile hard disk, magnetic disk, CD,
Computer storage, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random
Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It should be noted that computer-readable
The content that medium includes can carry out increase and decrease appropriate according to the requirement made laws in jurisdiction with patent practice, such as at certain
A little jurisdictions do not include electric carrier signal and telecommunication signal according to legislation and patent practice, computer-readable medium.
It can be seen from the above, in normal work due to purely resistive load circuit, not flat shoulder at current over-zero, and occur
Flat shoulder is had when fault electric arc, can determine whether circuit breaks down electric arc according to this feature.In the present invention, by detection electricity
The judgement for carrying out flat shoulder of the multiple half wave cycles of signal is flowed, meanwhile, occur the half wave cycles of flat shoulder in statistics preset duration
Quantity issues protection signal, then when being more than certain amount so as to further protect to circuit.Failure electricity of the invention
Arc detection method is simple and fast, can quickly react to fault electric arc.
It should be noted that the above is only a preferred embodiment of the present invention, but the design concept invented is not limited thereto,
All insubstantial modifications made using this design to the present invention, are also fallen within the scope of protection of the present invention.
Claims (10)
1. a kind of fault arc detection method, applied to the fault electric arc detection circuit of detection purely resistive load circuit, feature
It is, which comprises
Obtain sensed current signal；
The sensed current signal is sampled with preset sample frequency, obtains current sampling signal；
According to the flat shoulder judgement that carries out of the current sampling signal of half wave cycles multiple in the sensed current signal, statistics
There is the flat shoulder quantity of the half wave cycles of flat shoulder；
When flat shoulder quantity described in preset duration is more than the first preset quantity, issues fault electric arc and protect signal.
2. fault arc detection method according to claim 1, which is characterized in that
The current sampling signal according to half wave cycles multiple in the sensed current signal carries out flat shoulder judgement,
Include:
The flat shoulder current sample in the current sampling signal of current half wave cycles in pre-set current value range is obtained to believe
Number；
Whether the quantity that the flat shoulder current sampling signal continuously occurs in judgement is greater than or equal to the second preset quantity and owns
It is more than to preset effective current value there are current absolute value in the current sampling signal, if so, determining current half wave cycles
There is the flat shoulder in the sensed current signal.
3. fault arc detection method according to claim 2, which is characterized in that
Second preset quantity goes out according to each half wave cycles in the preset sample frequency and the sensed current signal
The time duration of the existing flat shoulder is configured.
4. fault arc detection method according to any one of claims 1 to 3, which is characterized in that
The current sampling signal according to half wave cycles multiple in the sensed current signal carries out flat shoulder judgement,
Include:
Sentenced according to the flat shoulder that carries out of all current sampling signals of each half wave cycles in the sensed current signal
It is disconnected.
5. a kind of fault arc detection device, applied to the fault electric arc detection circuit of detection purely resistive load circuit, feature
It is, described device includes:
Electric current obtains module, for obtaining sensed current signal；
Current sampling module obtains current sample letter for sampling with preset sample frequency to the sensed current signal
Number；
Flat shoulder judgment module, for according to the current sampling signals of half wave cycles multiple in the sensed current signal
Flat shoulder judgement is carried out, the flat shoulder quantity of the half wave cycles of flat shoulder occurs in statistics；
Fault determination module issues fault electric arc and protects when flat shoulder quantity described in preset duration is more than the first preset quantity
Protect signal.
6. fault arc detection device according to claim 5, which is characterized in that
The flat shoulder judgment module is according to the current sampling signals of half wave cycles multiple in the sensed current signal
Carry out flat shoulder judgement, comprising:
The flat shoulder current sample in the current sampling signal of current half wave cycles in pre-set current value range is obtained to believe
Number；
Whether the quantity that the flat shoulder current sampling signal continuously occurs in judgement is greater than or equal to the second preset quantity and owns
It is more than to preset effective current value there are current absolute value in the current sampling signal, if so, determining current half wave cycles
There is the flat shoulder in the sensed current signal.
7. fault arc detection device according to claim 6, which is characterized in that
Second preset quantity goes out according to each half wave cycles in the preset sample frequency and the sensed current signal
The time duration of the existing flat shoulder is configured.
8. according to the described in any item fault arc detection devices of claim 5 to 7, which is characterized in that
The flat shoulder judgment module is according to the current sampling signals of half wave cycles multiple in the sensed current signal
Carry out flat shoulder judgement, comprising:
Sentenced according to the flat shoulder that carries out of all current sampling signals of each half wave cycles in the sensed current signal
It is disconnected.
9. a kind of computer installation, including the fault electric arc detection circuit for detecting purely resistive load circuit, it is characterised in that:
The fault electric arc detection circuit includes processor, real when the processor is for executing the computer program stored in memory
Now as described in any one of Claims 1-4 the step of fault arc detection method.
10. a kind of computer readable storage medium, is stored thereon with computer program, it is characterised in that: the computer program
It is realized when being executed by processor as described in any one of Claims 1-4 the step of fault arc detection method.
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