CN107037341A - A kind of fault arc detection method - Google Patents
A kind of fault arc detection method Download PDFInfo
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- CN107037341A CN107037341A CN201710407966.0A CN201710407966A CN107037341A CN 107037341 A CN107037341 A CN 107037341A CN 201710407966 A CN201710407966 A CN 201710407966A CN 107037341 A CN107037341 A CN 107037341A
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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
- 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
Abstract
The present invention provides a kind of fault arc detection method, and by the use of the result of determination of current difference parameter as premise, fault electric arc is judged using relative harmonic content rate of change；Comprise the following steps：Step 1. carries out real-time sampling using current sensor to circuit, and step 2. calculates the difference parameter of current sampling period electric current and normal cycle electric current；Step 3. calculates odd harmonic containing ratio rate of change Δ Pn, and compared with respective threshold, the electric arc that breaks down is judged whether according to comparative result；If step 4. meets above-mentioned Rule of judgment, the electric arc that breaks down is judged, then output alarm signal, while output action signal, makes breaker actuation.The inventive method can effectively exclude the interference of nonlinear load, accurately detect fault electric arc, reduce amount of calculation, simplify fault electric arc judgment step.
Description
Technical field
The present invention relates to fault electric arc detection technique field, more particularly to a kind of fault arc detection method.
Background technology
In low-voltage network circuit, happened occasionally with the arc fault that short circuit mode is shown, typically circuit, equipment
Insulation ag(e)ing and breakage, or bad electrical connection are caused, when fault electric arc is produced, and the high temperature of electric arc release can be produced rapidly
Raw energy accumulation, causes fire.Fault electric arc is to trigger China's architectural electricity leading cause of fire, thus fault electric arc is entered
Row detection, eliminates fault electric arc and avoids fire particularly significant in time.
Conventional fault arc detection method mainly has three major types at present：Fault electric arc detection technique based on simulation model,
Fault electric arc detection technique based on physical characteristic, the fault electric arc detection technique based on time-frequency characteristic.Frequency domain characteristic therein
Analysis is examined by analyzing each harmonic content and phase angle, rate of total harmonics, the m-Acetyl chlorophosphonazo content of fault electric arc signal
Survey and recognize.The cyclic distortion of current signal is caused for fault electric arc, using methods such as Fast Fourier Transform (FFT)s to signal
Frequency analysis is carried out, judgment basis is used as according to harmonic wave factor and its rate of change.
Publication No. CN 104764963.A Chinese patent discloses a kind of alternating current arc fault detection method, its method
In include a kind of employ and calculate relative harmonic content and carry out the method for failure judgement electric arc, the defect of this method is：If just
Nonlinear load is added in normal circuit, its relative harmonic content, which can also increase, to transfinite, but now relative harmonic content is stably whole
Body is improved, and will not occur big ups and downs, if transfiniting to judge using relative harmonic content, it is possible to can judge by accident.
And if the interference of nonlinear load can be excluded using the rate of change of relative harmonic content, in this way, emphasis
Compare its rate of change, if accessing nonlinear load in circuit, trigger relative harmonic content increase to transfinite, but its rate of change will not surpass
Limit.Only break down electric arc when, relative harmonic content can acute variation, the rate of change of adjacent two cycles m-Acetyl chlorophosphonazo containing ratio can surpass
Limit, so as to be determined as fault electric arc.At present, also fault electric arc is judged using the rate of change of relative harmonic content without this
Method.
The content of the invention
In order to solve problem described in background technology, the present invention provides a kind of fault arc detection method, utilizes difference between current
The result of determination of different parameter is judged fault electric arc as premise using relative harmonic content rate of change.Can effectively it exclude
The interference of nonlinear load, accurately detects fault electric arc.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of fault arc detection method, by the use of the result of determination of current difference parameter as premise, is contained using harmonic wave
Rate rate of change is judged fault electric arc；Comprise the following steps：
Step 1. carries out real-time sampling to circuit using current sensor, and uses instruction current computing circuit, passes through frequency
Domain rapid analysis method, fault electric arc detection module is sent to by sampled value, the sampled value of electric current for 128 each cycles or 64 points weekly
Phase；Exemplified by 64 points, current sampling data is designated as I0、I1、……、I63, normal cycle electric current is designated as In0、In1、……、In63(adopt
Sample value and normal value are perunit value)；
Step 2. calculates the difference parameter of current sampling period electric current and normal cycle electric currentWill
IperWith threshold value S1Compare, if Iper≤S1, then sampled current value is assigned to normal cycle current value, updates normal cycle current value,
The cycle judges that fault-free electric arc occurs, and repeat step 1 carries out next periodic sampling calculating；If Iper＞ S1, redirect next step
Suddenly；Current difference parameter can exclude the influence that rectifier load is judged fault electric arc, to proceed next step judgement；
Step 3. calculates odd harmonic containing ratio rate of change Δ Pn, and compared with respective threshold, judged according to comparative result
Whether break down electric arc；
If step 4. meets above-mentioned Rule of judgment, the electric arc that breaks down is judged, then output alarm signal, while output action
Signal, makes breaker actuation.
Step 3 is comprised the following steps that：
Step 301. calculates sampling period odd harmonic containing ratio rate of change Δ PnWith given threshold Δ PthCompare；Harmonic wave
Containing ratio is defined asWherein I1For fundamental current, IhFor the root-mean-square value of h subharmonic currents,Xh1For h subharmonic current sampled values, M be take 3 in sampling number, this example, 5,7,9 times it is humorous
Ripple, calculating odd harmonic containing ratio is
Step 302. is using 7 power frequency sampling periods as one group, the 1st normal power frequency sampling period judged with step 2
It is worth based on electric current odd harmonic containing ratio P, calculates two neighboring power frequency sampling period electric current odd harmonic containing ratio rate of change
ΔPn, Δ Pn=Pn- P, every group of sampling period obtains 6 odd harmonic containing ratio rate of change Δ Pn；
Step 303. is by each Δ P in every groupnWith threshold value Δ PthIt is compared, if Δ Pn＞ Δs Pth, then this week is judged
Phase is the improper cycle, and improper periodicity N values Jia 1, continues next step；If Δ Pn＜ Δs Pth, then the cycle is judged without reason
Hinder electric arc, jump procedure 1；
If not step 304. normal cycle number N can be increased continuously to 6, then it is assumed that break down electric arc, continue next step
Suddenly, otherwise it is assumed that the electric arc that do not break down, jump procedure 1.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, a kind of fault arc detection method of the invention, the result of determination by the use of current difference parameter is adopted as premise
Fault electric arc is judged with relative harmonic content rate of change.Compared with directly using the method for harmonic content, side of the invention
Method can effectively exclude the interference of nonlinear load, accurately detect fault electric arc.
2nd, a kind of fault arc detection method of the invention, utilizes current difference parameter and odd harmonic containing ratio rate of change
Two conditions are that the detection of fault electric arc can be achieved, and reduce amount of calculation, simplify fault electric arc judgment step.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the fault arc detection device schematic diagram in embodiment of the present invention.
Embodiment
The embodiment provided below in conjunction with accompanying drawing the present invention is described in detail.
As shown in figure 1, a kind of fault arc detection method, the result of determination by the use of current difference parameter is adopted as premise
Fault electric arc is judged with relative harmonic content rate of change；Comprise the following steps：
Step 1. carries out real-time sampling to circuit using current sensor, and uses instruction current computing circuit, passes through frequency
Domain rapid analysis method, fault electric arc detection module is sent to by sampled value, the sampled value of electric current for 128 each cycles or 64 points weekly
Phase；Exemplified by 64 points, current sampling data is designated as I0、I1、……、I63, normal cycle electric current is designated as In0、In1、……、In63(adopt
Sample value and normal value are perunit value)；
Step 2. calculates the difference parameter of current sampling period electric current and normal cycle electric currentWill
IperWith threshold value S1Compare, if Iper≤S1, then sampled current value is assigned to normal cycle current value, updates normal cycle current value,
The cycle judges that fault-free electric arc occurs, and repeat step 1 carries out next periodic sampling calculating；If Iper＞ S1, redirect next step
Suddenly；Current difference parameter can exclude the influence that rectifier load is judged fault electric arc, to proceed next step judgement；
Step 3. calculates odd harmonic containing ratio rate of change Δ Pn, and compared with respective threshold, judged according to comparative result
Whether break down electric arc；
If step 4. meets above-mentioned Rule of judgment, the electric arc that breaks down is judged, then output alarm signal, while output action
Signal, makes breaker actuation.
Step 3 is comprised the following steps that：
Step 301. calculates sampling period odd harmonic containing ratio rate of change Δ PnWith given threshold Δ PthCompare；Harmonic wave
Containing ratio is defined asWherein I1For fundamental current, IhFor the root-mean-square value of h subharmonic currents,Xh1For h subharmonic current sampled values, M be take 3 in sampling number, this example, 5,7,9 times it is humorous
Ripple, calculating odd harmonic containing ratio is
Step 302. is using 7 power frequency sampling periods as one group, the 1st normal power frequency sampling period judged with step 2
It is worth based on electric current odd harmonic containing ratio P, calculates two neighboring power frequency sampling period electric current odd harmonic containing ratio rate of change
ΔPn, Δ Pn=Pn- P, every group of sampling period obtains 6 odd harmonic containing ratio rate of change Δ Pn；
Step 303. is by each Δ P in every groupnWith threshold value Δ PthIt is compared, if Δ Pn＞ Δs Pth, then this week is judged
Phase is the improper cycle, and improper periodicity N values Jia 1, continues next step；If Δ Pn＜ Δs Pth, then the cycle is judged without reason
Hinder electric arc, jump procedure 1；
If not step 304. normal cycle number N can be increased continuously to 6, then it is assumed that break down electric arc, continue next step
Suddenly, otherwise it is assumed that the electric arc that do not break down, jump procedure 1.
Fault electric arc detection process sketch will sample as shown in Fig. 2 sampled using current sensor to load current
Value is sent to fault electric arc detection module and judges whether the electric arc that breaks down, if occurring, output breaker actuation signal and alarm
Signal.
A kind of fault arc detection method of the present invention, by the use of the result of determination of current difference parameter as premise, is used
Relative harmonic content rate of change is judged fault electric arc.Compared with directly using the method for harmonic content, method of the invention
The interference of nonlinear load can be effectively excluded, fault electric arc is accurately detected.
A kind of fault arc detection method of the present invention, utilizes current difference parameter and odd harmonic containing ratio rate of change two
Individual condition is that the detection of fault electric arc can be achieved, and reduces amount of calculation, simplifies fault electric arc judgment step.
Above example is implemented lower premised on technical solution of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment
It is conventional method not mentionlet alone bright.
Claims (2)
1. a kind of fault arc detection method, it is characterised in that by the use of the result of determination of current difference parameter as premise, is used
Relative harmonic content rate of change is judged fault electric arc, is comprised the following steps：
Step 1. carries out real-time sampling using current sensor to circuit, and uses current operator, by frequency domain rapid analysis method,
Sampled value is sent to fault electric arc detection module, the sampled value of electric current is 128 each cycles or 64 each cycles；It is with 64 points
Example, I is designated as by current sampling data0、I1、……、I63, normal cycle electric current is designated as In0、In1、……、In63(sampled value and normal
Value is perunit value)；
Step 2. calculates the difference parameter of current sampling period electric current and normal cycle electric currentBy IperWith
Threshold value S1Compare, if Iper≤S1, then sampled current value is assigned to normal cycle current value, updates normal cycle current value, this week
Phase judges that fault-free electric arc occurs, and repeat step 1 carries out next periodic sampling calculating；If Iper＞ S1, redirect next step；Electricity
Stream difference parameter can exclude the influence that rectifier load is judged fault electric arc, to proceed next step judgement；
Step 3. calculates odd harmonic containing ratio rate of change Δ Pn, and compared with respective threshold, hair is judged whether according to comparative result
Raw fault electric arc；
If step 4. meets above-mentioned Rule of judgment, the electric arc that breaks down is judged, then output alarm signal, while output action is believed
Number, make breaker actuation.
2. a kind of fault arc detection method according to claim 1, it is characterised in that step 3 is comprised the following steps that：
Step 301. calculates sampling period odd harmonic containing ratio rate of change Δ PnWith given threshold Δ PthCompare；Harmonic wave contains
Rate is defined asWherein I1For fundamental current, IhFor the root-mean-square value of h subharmonic currents,Xh1For h subharmonic current sampled values, M is sampling number, take 3 herein, 5,7,9 times it is humorous
Ripple, calculating odd harmonic containing ratio is
Step 302. is using 7 power frequency sampling periods as one group, the 1st normal power frequency sampling period electric current judged with step 2
It is worth based on odd harmonic containing ratio P, calculates two neighboring power frequency sampling period electric current odd harmonic containing ratio rate of change Δ Pn,
ΔPn=Pn- P, every group of sampling period obtains 6 odd harmonic containing ratio rate of change Δ Pn；
Step 303. is by each Δ P in every groupnWith threshold value Δ PthIt is compared, if Δ Pn＞ Δs Pth, then judge that the cycle is
Improper cycle, improper periodicity N values Jia 1, continue next step；If Δ Pn＜ Δs Pth, then cycle fault-free electricity is judged
Arc occurs, jump procedure 1；
If not step 304. normal cycle number N can be increased continuously to 6, then it is assumed that break down electric arc, continue next step, it is no
Then think the electric arc that do not break down, jump procedure 1.
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Cited By (6)
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| CN109490701A (en) * | 2018-09-17 | 2019-03-19 | 南京航空航天大学 | A kind of power frequency series arc faults detection method |
| CN109946535A (en) * | 2018-12-28 | 2019-06-28 | 上海汇鸿智能控制系统股份有限公司 | A kind of fault arc detection method |
| CN110058133A (en) * | 2019-04-15 | 2019-07-26 | 杭州拓深科技有限公司 | A kind of electrical circuit fault electric arc wrong report optimization method based on feedback mechanism |
| CN113163547A (en) * | 2021-02-02 | 2021-07-23 | 上汽大众汽车有限公司 | Self-learning diagnosis system and diagnosis method of LED light source |
| CN113702755A (en) * | 2021-08-10 | 2021-11-26 | 国网江苏省电力有限公司盐城供电分公司 | Method for detecting grounding arc fault of power distribution system |
| CN115508702A (en) * | 2022-11-16 | 2022-12-23 | 上海红檀智能科技有限公司 | Miniature intelligent circuit breaker fracture arc and thermal protection self-checking method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109946535A (en) * | 2018-12-28 | 2019-06-28 | 上海汇鸿智能控制系统股份有限公司 | A kind of fault arc detection method |
| CN110058133A (en) * | 2019-04-15 | 2019-07-26 | 杭州拓深科技有限公司 | A kind of electrical circuit fault electric arc wrong report optimization method based on feedback mechanism |
| CN110058133B (en) * | 2019-04-15 | 2021-03-02 | 杭州拓深科技有限公司 | Feedback mechanism-based electric circuit fault arc false alarm optimization method |
| CN113163547A (en) * | 2021-02-02 | 2021-07-23 | 上汽大众汽车有限公司 | Self-learning diagnosis system and diagnosis method of LED light source |
| CN113702755A (en) * | 2021-08-10 | 2021-11-26 | 国网江苏省电力有限公司盐城供电分公司 | Method for detecting grounding arc fault of power distribution system |
| CN115508702A (en) * | 2022-11-16 | 2022-12-23 | 上海红檀智能科技有限公司 | Miniature intelligent circuit breaker fracture arc and thermal protection self-checking method |
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Application publication date: 20170811 |