CN109959849A - Fault detection method and system, storage medium and processor - Google Patents
Fault detection method and system, storage medium and processor Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
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- 238000013507 mapping Methods 0.000 claims description 13
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a fault detection method and system, a storage medium and a processor. Wherein, the method comprises the following steps: acquiring at least one sampling frequency point of a target load, wherein the sampling frequency point indicates the frequency of a current signal sine wave; calculating a total amplitude of at least one sampling frequency point; and if the total amplitude exceeds a target limit threshold, determining that the target load has an arc fault. The invention solves the technical problem of low detection efficiency caused by large calculation amount when the arc fault is considered in the related technology.
Description
Technical field
The present invention relates to circuit detection technique fields, are situated between in particular to a kind of fault detection method and system, storage
Matter and processor.
Background technique
In the related art, wire insulation aging or breakage or poor contact, may all break down electric arc.Failure
Arc spark temperature is very high, it is possible to cause around combustible it is on fire, lead to electrical fire, therefore, it is necessary to on circuit therefore
Barrier electric arc is measured in real time, to ensure the safety of circuit and production and living, and in current detection, often for a variety of negative
It carries, not only needs complicated calculating, and computationally intensive, not sensitive enough the arcing cycle caused of some can't detect.For example,
It in patent (CN104678265A), needs first to acquire L period, then determines a reference cycle, calculate this reference cycle
Then S_ref could calculate the ratio D2 in each period, it is therefore necessary to can just judge whether that electric arc, and the occurs by L period
1 period can not judge whether to occur.Calculating current change rate, harmonic component, the ratio of harmonic component and fundamental wave, ratio
With inverse discrete Fourier transform, algorithm is complicated, computationally intensive.
For above-mentioned problem, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of fault detection method and systems, storage medium and processor, at least to solve
In the related technology when considering arc fault, the computationally intensive technical problem for causing detection efficiency low.
According to an aspect of an embodiment of the present invention, a kind of fault detection method is provided, comprising: obtain targeted loads
At least one sample frequency point, wherein the frequency of the sample frequency point indicator current signal sine wave；Calculate described at least one
The total amplitude of a sample frequency point；If the total amplitude exceeds tar-get threshold value, determine that electric arc event occurs for the targeted loads
Barrier.
Further, the step of calculating the total amplitude of at least one sample frequency point, comprising: determine the sampling period；
Acquire current signal of the targeted loads within the sampling period；Current signal in the sampling period is carried out in Fu
Leaf transformation obtains the amplitude of each sample frequency point；Add up the amplitude of each sample frequency point, obtains total width
Value.
Further, the targeted loads are being acquired after the current signal in the sampling period, the method is also
It include: the mapping parameters table for obtaining current value and limiting threshold value；According to current range locating for the current signal, reflected described
It penetrates in parameter list and searches corresponding restriction threshold value；Using the restriction threshold value found in the mapping parameters table as the target
Limit threshold value.
Further, the sample frequency point includes at least one following: 150Hz, 250Hz, 350Hz, 450Hz,
550Hz、650Hz、750Hz、850Hz、950Hz、1050Hz、1150Hz。
Further, the targeted loads include at least: electric kettle, electric heater, heater, electric oven, electric iron.
Further, after determining that arc fault occurs for the targeted loads, the method also includes: transmitting line is protected
Protect signal, wherein the circuit protection signal is used to inform that target user to need to carry out the route where the targeted loads
Maintenance.
Further, when the quantity of the targeted loads is more than or equal to two, at least two targeted loads are in parallel
Connection.
According to another aspect of an embodiment of the present invention, a kind of fault detection system is additionally provided, comprising: at least one is resistive
Load；Current transformer is connect at least one described resistive load, for detecting at least one sampling frequency of the resistive load
The current signal of rate point；It handles chip and obtains the width of each sample frequency point for converting to the current signal
Value, the amplitude for each sample frequency point that adds up obtain total amplitude, and when the total amplitude exceeds tar-get threshold value,
Determine that arc fault occurs at least one described resistive load.
Further, the system also includes: signal amplification circuit is connect, for will test with the current transformer
To the current signal amplify processing, and amplified current signal is transmitted to the processing chip.
According to another aspect of an embodiment of the present invention, a kind of storage medium is additionally provided, the storage medium is for storing
Program, wherein equipment where described program controls the storage medium when being executed by processor executes above-mentioned any one institute
The fault detection method stated.
According to another aspect of an embodiment of the present invention, a kind of processor is additionally provided, the processor is used to run program,
Wherein, fault detection method described in above-mentioned any one is executed when described program is run.
In embodiments of the present invention, using at least one the sample frequency point for obtaining targeted loads, wherein sample frequency point
The frequency of indicator current signal sine wave calculates the total amplitude of at least one sample frequency point, if total amplitude exceeds tar-get
Threshold value determines that arc fault occurs for targeted loads.In this embodiment it is possible to pass through the amplitude of each sampled point of computational load,
Quickly judge whether resistive load occurs arc fault, can accurately determine whether load occurs electricity without a large amount of calculation amount
Arc failure avoids load that arc fault occurs and causes fire incident, to solve in the related technology when considering arc fault, meter
The technical problem that calculation amount causes greatly detection efficiency low.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of flow chart of fault detection method according to an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram for acquiring current waveform according to an embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of the current spectrum of load according to an embodiment of the present invention；
Fig. 4 is the schematic diagram of the current spectrum of another load according to an embodiment of the present invention；
Fig. 5 is the schematic diagram of another acquisition current waveform according to an embodiment of the present invention；
Fig. 6 is a kind of schematic diagram of fault detection system according to an embodiment of the present invention；
Fig. 7 is the schematic diagram of another optional fault detection system according to an embodiment of the present invention；
Fig. 8 is a kind of schematic diagram of system detecting method according to an embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
To understand the present invention convenient for user, solution is made to part term or noun involved in various embodiments of the present invention below
It releases:
Fast Fourier transform, Fast Transformation, abbreviation FFT are also the fast algorithm of discrete fourier transform.
It is the characteristics such as odd, even, empty, real according to discrete fourier transform, acquisition is improved to the algorithm of discrete Fourier transform.It is logical
Time-domain signal can be converted to frequency-region signal by crossing fft algorithm, that is, an irregular waveform is decomposed into many sines
Wave or cosine wave.
The amplitude of sine wave, the i.e. peak value of sine wave.Such as Gu Feng or peak.
Frequency point, the i.e. frequency of sine wave.
The amplitude of Frequency point refers to the amplitude (i.e. peak value) of sine wave.
The following embodiments of the present invention can be applied to the detection of the arc fault (easily causing fire) of various circuits, to each
Kind resistive load carries out quick, simple arc fault detection, and the load of detection can be one, can if there is multiple loads
The arc fault of some load in load in parallel is detected.Various embodiments of the present invention are carried out specifically below
It is bright.
Embodiment one
According to embodiments of the present invention, a kind of fault detection method embodiment is provided, it should be noted that in the stream of attached drawing
The step of journey illustrates can execute in a computer system such as a set of computer executable instructions, although also, flowing
Logical order is shown in journey figure, but in some cases, it can be to be different from shown or described by sequence execution herein
The step of.
Fig. 1 is a kind of flow chart of fault detection method according to an embodiment of the present invention, as shown in Figure 1, this method includes
Following steps:
Step S102 obtains at least one sample frequency point of targeted loads, wherein sample frequency point indicator current signal
The frequency of sine wave；
Step S104 calculates the total amplitude of at least one sample frequency point；
Step S106 determines that arc fault occurs for targeted loads if total amplitude exceeds tar-get threshold value.
It through the above steps, can be using at least one the sample frequency point for obtaining targeted loads, wherein sample frequency point
The frequency of indicator current signal sine wave calculates the total amplitude of at least one sample frequency point, if total amplitude exceeds tar-get
Threshold value determines that arc fault occurs for targeted loads.In this embodiment it is possible to pass through the amplitude of each sampled point of computational load,
Quickly judge whether resistive load occurs arc fault, can accurately determine whether load occurs electricity without a large amount of calculation amount
Arc failure avoids load that arc fault occurs and causes fire incident, to solve in the related technology when considering arc fault, meter
The technical problem that calculation amount causes greatly detection efficiency low.
Step S102 obtains at least one sample frequency point of targeted loads, wherein sample frequency point indicator current signal
The frequency of sine wave.
The targeted loads of the embodiment of the present invention can be resistive load (for example, resistive load in household electrical appliance), the mesh
Mark load includes but is not limited to: electric kettle, electric heater, heater, electric oven, electric iron.It bears in embodiments of the present invention
The quantity of load can be that one or more can be connected in parallel when load is multiple, to carry out electric arc event to wherein each load
The detection of barrier.Optionally, when the quantity of targeted loads is more than or equal to two, at least two targeted loads are connected in parallel.
And sample frequency point includes at least one following: 150Hz, 250Hz, 350Hz, 450Hz, 550Hz, 650Hz,
750Hz,850Hz,950Hz,1050Hz,1150Hz.Waveform sampling, available a variety of frequencies are carried out to different sample frequency points
The sine wave of rate, for example, being 1MHz to sample frequency, the waveform of sampling time 1s carries out FFT transform, available frequency difference
For 1Hz, 2Hz, 3Hz ..., the sine wave of 500KHz.
Step S104 calculates the total amplitude of at least one sample frequency point.
Optionally, the step of calculating the total amplitude of at least one sample frequency point, comprising: determine the sampling period；Acquire mesh
The current signal of mark load during the sampling period；Fourier transformation is carried out to the current signal in the sampling period, obtains each adopt
The amplitude of sample Frequency point；Add up the amplitude of each sample frequency point, obtains total amplitude.
Sampling period can be user's self-setting, be also possible to staff according to existing arc fault detection side
What formula determined, for example, the setting sampling period is 20ms, i.e., the current data once loaded is acquired every 20ms.And when acquiring total
Length can be changed in real time according to the arc fault judgment mode of each circuit, for example, setting acquisition total duration is 1s or 5s
To acquire the current waveform of the load of 1s.
Fig. 2 is a kind of schematic diagram for acquiring current waveform according to an embodiment of the present invention, as shown in Fig. 2, the current waveform
Including being individually supported on the current waveform of normal operation and being individually supported on current waveform when arc fault occurs.With centre one
Vertical line is interval, and left side be the current waveform operated normally, current waveform when right side is generation arc fault, it can be seen that just
Often the current waveform of resistive load occurs have distortion (to exist at current over-zero when arc fault very close to sine wave when operation
Electric current is distorted when being 0A).
Fig. 3 is a kind of schematic diagram of the current spectrum of load according to an embodiment of the present invention, as shown in figure 3, electric current frequency
Current spectrum when arc fault does not occur for single load for spectrum, and which show the normal currents to duration 1s to carry out Fourier's change
The amplitude that each Frequency point is obtained after changing, Frequency point be 150Hz, 250Hz, 350Hz, 450Hz, 550Hz, 650Hz, 750Hz,
The amplitude of 850Hz, 950Hz are not very high.It is laterally frequency (Hz) that longitudinal is amplitude (respectively with 0.05,0.1 and in Fig. 3
0.15 divides).
Fig. 4 is the schematic diagram of the current spectrum of another load according to an embodiment of the present invention, as shown in figure 4, the electric current
Frequency spectrum is the current spectrum that arc fault has occurred in single load, which show the electric current of the generation arc fault to duration 1s into
The amplitude of each Frequency point is obtained after row Fourier transformation, which is amplitude of the arc fault in the Frequency point of 100Hz to 1Khz,
It is the amplitude that electric arc occurs for 150Hz, 250Hz, 350Hz, 450Hz, 550Hz, 650Hz, 750Hz, 850Hz, 950Hz in Frequency point
It is more much larger than normal amplitude shown in Fig. 3.It is laterally frequency (Hz) that longitudinal is amplitude (respectively with 0.05,0.1 and in Fig. 4
0.15 divides).
Fig. 5 is the schematic diagram of another acquisition current waveform according to an embodiment of the present invention, as shown in figure 5, the current wave
When shape is supported on parallel connection for two, the current waveform of normal operation.Compared with the single resistive load in Fig. 2, in the electricity of load
On the peak value for flowing waveform, the current waveform peak value (top peaks or valleys peak) of two loads is significantly greater than the current waveform peak individually loaded
Value.It is laterally the time (s) in Fig. 5, longitudinal is electric current (A).
Preferably, Fourier transformation can be Fast Fourier Transform (FFT) FFT.
After the amplitude to above-mentioned each sample frequency point samples, the amplitude number of each sample frequency point can be determined
Value, the amplitude for each sample frequency point that then can add up obtain total amplitude.
In embodiments of the present invention, after acquiring the current signal of targeted loads during the sampling period, method further include:
It obtains current value and limits the mapping parameters table of threshold value；The current range according to locating for current signal is looked into mapping parameters table
Look for corresponding restriction threshold value；Using the restriction threshold value found in mapping parameters table as tar-get threshold value.
Restriction threshold value i.e. in the embodiment of the present invention is related to size of current, and the value of the restriction threshold values of different electric currents is different.
Optionally, the setting range for limiting threshold value can be between the total amplitude in normal value and arc fault, which can pass through
Test and the adjustment of actual test result.For example, following table 1 is the mapping parameters table that setting limits threshold value,
Table 1
Pass through the content in table 1, it can be seen that the restriction threshold value of setting can be in normal value and total width when arc fault
Between value.The restriction threshold value is set according to different current values.
With a kind of optional sample frequency point 150Hz for example, table 2 is that sample frequency point sets restriction in 150Hz
The mapping parameters table of threshold value.
Table 2
By above steps, the total amplitude for being supported on each sample frequency point can be calculated, no matter loading is one
Or it is multiple, sampling processing can be carried out to the amplitude for being respectively supported on each sample frequency point.
Step S106 determines that arc fault occurs for targeted loads if total amplitude exceeds tar-get threshold value.
It can use in the embodiment of the present invention and compare total amplitude and restriction threshold value, determine that electric arc event occurs for load if exceeding
Barrier.
In embodiments of the present invention, after determining that arc fault occurs for targeted loads, method further include: transmitting line is protected
Protect signal, wherein circuit protection signal is for informing that target user needs to repair the route where targeted loads.
After arc fault can occurring determining load in circuit, model by the circuit to break down or is specifically loaded
It is sent to staff, to allow work that the route or load is repaired or replaced.Optionally, in the embodiment of the present invention,
Signal can be protected by wired or wireless two ways transmitting line, wired mode can be through optical fiber, telephone wire etc.
Send alarm signal, and wirelessly, be by sending in the terminal that a protection signal data packet is held to staff,
In a manner of mail or short message, which is sent in the terminal that staff holds.It can thus allow
Staff knows that arc fault occurs for which load.
Illustrate the present invention below by an alternative embodiment.
Embodiment two
Fig. 6 is a kind of schematic diagram of fault detection system according to an embodiment of the present invention, as shown in fig. 6, the fault detection
System may include:
At least one resistive load 61；
Current transformer 63 is connect at least one resistive load, for detecting at least one sample frequency of resistive load
The current signal of point；
Chip 65 is handled, for being converted to current signal, the amplitude of each sample frequency point is obtained, adds up and each adopt
The amplitude of sample Frequency point obtains total amplitude, and when total amplitude exceeds tar-get threshold value, determines that at least one resistive load is sent out
Raw arc fault.
Above-mentioned fault detection system can detect at least one sample frequency point of resistive load by current transformer 63
Current signal, and current signal is converted using processing chip 65, the amplitude of each sample frequency point is obtained, is added up each
The amplitude of sample frequency point obtains total amplitude, and when total amplitude exceeds tar-get threshold value, determines at least one resistive load
At least one sample frequency point that arc fault obtains targeted loads occurs, wherein sample frequency point indicator current signal is sinusoidal
The frequency of wave calculates the total amplitude of at least one sample frequency point, if total amplitude exceeds tar-get threshold value, determines targeted loads
Arc fault occurs.In this embodiment it is possible to pass through the amplitude of each sampled point of computational load, resistive load is quickly judged
Whether arc fault occurs, can accurately determine whether load occurs arc fault without a large amount of calculation amount, load is avoided to send out
Raw arc fault causes fire incident, thus solve in the related technology when considering arc fault, it is computationally intensive that detection is caused to be imitated
The low technical problem of rate.
Optionally, system further include: signal amplification circuit is connect with current transformer, the electric current letter for will test
Number processing is amplified, and amplified current signal is transmitted to processing chip.
Fig. 7 is the schematic diagram of another optional fault detection system according to an embodiment of the present invention, as shown in fig. 7, should
Fault detection system may include: resistive load 710, resistive load 712, current transformer 73, signal amplification circuit 75, control
Chip 77.
Fig. 8 is a kind of schematic diagram of system detecting method according to an embodiment of the present invention, and this method can be applied to such as Fig. 7 institute
In the fault detection system shown, as shown in figure 8, this method comprises:
Step S801, current transformer export the current waveform sampled, obtain current sampling data；
Current sampling data is amplified processing by step S803, signal amplification circuit；
Step S805, processing chip carry out FFT transform processing to the current sampling data in a sampling period, obtain each frequency
The amplitude of rate point；
Step S807, calculate each Frequency point amplitude and；
Whether step S809 judges the amplitude of each Frequency point and is greater than to limit threshold value；If so, step S811 is executed, if it is not,
Return to step S805.
Step S811 is determined and arc fault is occurred in the period.
Through the foregoing embodiment, arc fault detection can be carried out to each load for one or more resistive loads,
The generation that can effectively judge resistive load fault electric arc rapidly avoids resistive load that arc fault occurs and causes fire thing
Therefore in multiple resistive load parallel runnings, when arc fault occurs for one of load, this method can also effectively be sentenced rapidly
It is disconnected.
According to another aspect of an embodiment of the present invention, a kind of storage medium is additionally provided, storage medium is used to store program,
Wherein, equipment where program controls storage medium when being executed by processor executes the fault detection method of above-mentioned any one.
According to another aspect of an embodiment of the present invention, a kind of processor is additionally provided, processor is used to run program,
In, program executes the fault detection method of above-mentioned any one when running.
Present invention also provides a kind of computer program products, when executing on data processing equipment, are adapted for carrying out just
The program of beginningization there are as below methods step: at least one sample frequency point of targeted loads is obtained, wherein the instruction of sample frequency point
The frequency of current signal sine wave；Calculate the total amplitude of at least one sample frequency point；If total amplitude exceeds tar-get threshold value,
Determine that arc fault occurs for targeted loads.
Optionally, when executing on data processing equipment, it is further adapted for executing the program of initialization there are as below methods step: really
Determine the sampling period；Acquire the current signal of targeted loads during the sampling period；Current signal in sampling period is carried out in Fu
Leaf transformation obtains the amplitude of each sample frequency point；Add up the amplitude of each sample frequency point, obtains total amplitude.
Optionally, when executing on data processing equipment, it is further adapted for executing the program of initialization there are as below methods step:
After acquiring the current signal of targeted loads during the sampling period, obtains current value and limit the mapping parameters table of threshold value；According to
Current range locating for current signal searches corresponding restriction threshold value in mapping parameters table；It will be searched in mapping parameters table
The restriction threshold value arrived is as tar-get threshold value.
Optionally, sample frequency point includes at least one following: 150Hz, 250Hz, 350Hz, 450Hz, 550Hz,
650Hz、750Hz、850Hz、950Hz、1050Hz、1150Hz。
Optionally, targeted loads include at least: electric kettle, electric heater, heater, electric oven, electric iron.
Optionally, when executing on data processing equipment, it is further adapted for executing the program of initialization there are as below methods step:
After determining that arc fault occurs for targeted loads, transmitting line protects signal, wherein circuit protection signal is for informing that target is used
Family needs to repair the route where targeted loads.
Optionally, when the quantity of targeted loads is more than or equal to two, at least two targeted loads are connected in parallel.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
In the above embodiment of the invention, it all emphasizes particularly on different fields to the description of each embodiment, does not have in some embodiment
The part of detailed description, reference can be made to the related descriptions of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of unit or module
It connects, can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
On unit.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can for personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes: that USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic or disk etc. be various to can store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (11)
1. a kind of fault detection method characterized by comprising
Obtain at least one sample frequency point of targeted loads, wherein the sample frequency point indicator current signal sine wave
Frequency；
Calculate the total amplitude of at least one sample frequency point；
If the total amplitude exceeds tar-get threshold value, determine that arc fault occurs for the targeted loads.
2. the method according to claim 1, wherein calculating the total amplitude of at least one sample frequency point
Step, comprising:
Determine the sampling period；
Acquire current signal of the targeted loads within the sampling period；
Fourier transformation is carried out to the current signal in the sampling period, obtains the amplitude of each sample frequency point；
Add up the amplitude of each sample frequency point, obtains the total amplitude.
3. according to the method described in claim 2, it is characterized in that, acquiring the targeted loads within the sampling period
After current signal, the method also includes:
It obtains current value and limits the mapping parameters table of threshold value；
According to current range locating for the current signal, corresponding restriction threshold value is searched in the mapping parameters table；
Using the restriction threshold value found in the mapping parameters table as the tar-get threshold value.
4. the method according to claim 1, which is characterized in that the sample frequency point includes following
At least one: 150Hz, 250Hz, 350Hz, 450Hz, 550Hz, 650Hz, 750Hz, 850Hz, 950Hz, 1050Hz, 1150Hz.
5. the method according to claim 1, which is characterized in that the targeted loads include at least: electricity
Hot-water bottle, electric heater, heater, electric oven, electric iron.
6. the method according to claim 1, wherein after determining that arc fault occurs for the targeted loads,
The method also includes:
Transmitting line protects signal, wherein the circuit protection signal is for informing that target user needs to the targeted loads
The route at place repairs.
7. the method according to claim 1, wherein the targeted loads quantity be more than or equal to two when,
At least two targeted loads are connected in parallel.
8. a kind of fault detection system characterized by comprising
At least one resistive load；
Current transformer is connect at least one described resistive load, for detecting at least one sampling frequency of the resistive load
The current signal of rate point；
Chip is handled, for being converted to the current signal, the amplitude of each sample frequency point is obtained, adds up each
The amplitude of the sample frequency point obtains total amplitude, and when the total amplitude exceeds tar-get threshold value, determination is described at least
Arc fault occurs for one resistive load.
9. system according to claim 8, which is characterized in that the system also includes:
Signal amplification circuit is connect with the current transformer, and the current signal for will test amplifies processing,
And amplified current signal is transmitted to the processing chip.
10. a kind of storage medium, which is characterized in that the storage medium is for storing program, wherein described program is processed
Fault detection method described in any one of equipment perform claim requirement 1 to 7 device controls the storage medium when executing where.
11. a kind of processor, which is characterized in that the processor is for running program, wherein right of execution when described program is run
Benefit require any one of 1 to 7 described in fault detection method.
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