CN206930727U - A kind of fault arc detection device for gathering communication - Google Patents
A kind of fault arc detection device for gathering communication Download PDFInfo
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- CN206930727U CN206930727U CN201720716727.9U CN201720716727U CN206930727U CN 206930727 U CN206930727 U CN 206930727U CN 201720716727 U CN201720716727 U CN 201720716727U CN 206930727 U CN206930727 U CN 206930727U
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Abstract
A kind of fault arc detection device for gathering communication, MCU micro-control units connect high frequency filter, low frequency signal modulate circuit, SIM card circuit, 485 circuits, WIFI module respectively, high frequency filter connects high-frequency signal modulate circuit, low frequency signal modulate circuit connecting line low-frequency current transformer, high-frequency signal modulate circuit connects HF current transformer, and civil power after power module by obtaining to the voltage required for the power supply of MCU micro-control units and low frequency signal modulate circuit and high-frequency signal modulate circuit amplifier.
Description
Technical field
It the utility model is related to a kind of electric arc detecting device, and in particular to a kind of fault electric arc for gathering communication
Detection means.
Background technology
Chinese patent once disclosed a kind of for that can be connected including photovoltaic panel and using DC power transmission lines with the photovoltaic panel
Load system in arc-detection method (201110349734.7), methods described measurement is delivered to the work(of the load
Rate, thus produce the first measurement result of the power for being delivered to the load.Also measure by power caused by the photovoltaic panel,
Thus produce the second measurement result by power caused by the photovoltaic panel.Compare first measurement result and described second
Measurement result, thus produce differential power measurement result.When the differential power measurement result exceedes threshold value, can also set
Alert if.Preferably, modulate second measurement result and pass through the second measurement result described in the DC power line transmissions.
Chinese patent once disclosed a kind of parallel arc using wavelet transform and detects (200910262530.2), held
The device of row parallel arc fault cutout, including：Current sensing device, to sense electrical load, quilt in the electric circuit
It is configured to produce the output signal for representing to flow through its load current；Detection unit, and the current sensing device signal communication, and
It is configured as receiving the output signal as caused by the current sensing device, is configured and is arranged as based on output signal output two
Secondary signal；And microcontroller, it is coupled to the detection unit, in response to computer executable instructions, the instruction is by the microcontroller
When device performs so that the microcontroller, which is received and brought via discrete wavelet transformer, decomposes the secondary singal so as to obtain discrete wavelet
Coefficient, and calculate the sum of discrete wavelet coefficient, compare the discrete wavelet coefficient and and predetermined threshold, when the load current of sensing
When meeting more than preselected threshold condition caused by predetermined threshold and the discrete wavelet coefficient and common expression trip signal, production
Raw trip signal.
Chinese patent once disclosed a kind of series fault arc detection circuit (201510897303.2), including current sample
Circuit (1), is arranged on the live wire of detected circuit, and the current detection signal of live wire electric current high fdrequency component is characterized for exporting；
Noise suppressed amplifying circuit, for carrying out denoising and amplification acquisition ac high frequency signal to the current detection signal；Rectified current
Road, for ac high frequency signal to be converted into direct current high-frequency signal；Comparison circuit, the width for the direct current high-frequency signal
Value and predetermined voltage threshold, export fault electric arc cue；And control circuit, for prompting to believe according to the fault electric arc
Number output protection signal.The utility model can improve the accuracy of series fault arc detection, reduce the malfunction of protection device
Work and refused action situation, and then the reliability of fault arc protection device is improved, realize that it is serious in remote or electromagnetic interference
Environment in steady operation.
Also it is directed to detection means caused by electric arc without one kind in the market.When broken down in circuit electric arc when, bear
Charged current typically understands very little, less than the setting of the current power system particularly overcurrent protection that low-voltage distribution field is installed extensively
Value, fault electric arc is not in the range of protection.As fire caused by fault electric arc causes the property loss getting worse of personnel,
In order to reduce the unsafe factor of household electric appliances fault electric arc initiation, the National Electrical regulations (NEC) in the U.S. are on failure
Arc protection has put into effect a series of mandatory provisions.In recent years, become in electrical fire caused by China's fault electric arc in rising
Gesture, cause heavy economic losses.As the country gradually steps up to the protection attention degree of low-voltage safety and arc fault, national gesture
Also the mandatory rules of law of some installation arc protection equipment must can be put into effect, the application prospect of AFCI technologies is huge.
Utility model content
The purpose of this utility model is that SIM card communication, 485 communications and wireless WIFI communications can be carried out by providing one kind
Fault arc detection device.It is that fault electric arc is judged based on neural network algorithm and difference algorithm, is increased to electricity
The accuracy that arc judges, reduce the malfunction of fault electric arc breaker, can not only detect fault electric arc, and can pass through
Fault message is uploaded to monitoring host computer processing by SIM card, 485, wireless WIFI.
To reach above-mentioned purpose, the technical solution adopted in the utility model is：A kind of failure for gathering communication
Electric arc detecting device, MCU micro-control units connect high frequency filter, low frequency signal modulate circuit, SIM card circuit, 485 electricity respectively
Road, WIFI module, high frequency filter connection high-frequency signal modulate circuit, low frequency signal modulate circuit connecting line low-frequency current mutual inductance
Device, high-frequency signal modulate circuit connection HF current transformer, civil power are supplied by being obtained after power module to MCU micro-control units
Voltage required for electricity and low frequency signal modulate circuit and high-frequency signal modulate circuit amplifier.
A kind of fault arc detection method for gathering communication, MCU micro-control units connect High frequency filter respectively
Device, low frequency signal modulate circuit, SIM card circuit, 485 circuits, WIFI module, high frequency filter connection high-frequency signal conditioning electricity
Road, low frequency signal modulate circuit connection low-frequency current transformer, high-frequency signal modulate circuit connection HF current transformer, civil power
By being obtained after power module to the power supply of MCU micro-control units and low frequency signal modulate circuit and high-frequency signal modulate circuit amplifier
Required voltage, low-frequency current transformer are used for obtaining current signal and voltage signal in major loop, and by waveform come
Loadtype is identified, HF current transformer is used for obtaining high-frequency impulse；When serial arc or parallel arc occur for circuit, warp
Primary signal isolation is first narrowed down to certain limit by low-frequency current transformer, is then become signal by low frequency signal modulate circuit
The scope that can be handled into MCU micro-control units, most obtains voltage and current signal through MCU microprocessing units afterwards, is born
Carry type；HF current transformer obtains bandpass signal by high frequency filter, then is obtained by high-frequency signal modulate circuit
High-frequency signal between 30K-100K, MCU micro-control units are inputted, judge whether to draw by the AD pulses for sampling to obtain
Arc, low-frequency current transformer obtain the current signal in major loop, and the current signal I of its secondary side nurses one's health electricity by low frequency signal
Current signal is become voltage signal U by road, then carries out rectification to voltage signal U, the signal after rectification is transmitted into MCU micro-controls
Unit processed, HF current transformer obtains bandpass signal by high frequency filter, then is obtained by high-frequency signal modulate circuit
High-frequency signal PLUSE1, MCU micro-control unit between 30K-100K passes through A/D passages, collection high-frequency signal PLUSE1 letter
Breath, the change of current spectrum in major loop is detected by difference algorithm, carries out the judgement of fault electric arc, it is due to circuit to distinguish
The normal startup of middle load, is also due to interference caused by the power adjusting of load or there occurs fault electric arc.
Described MCU micro-control units are also connected with reset circuit.
Described MCU micro-control units are also connected with sound light alarming circuit.
Described SIM card circuit by transmitting fault information to monitoring host computer, monitoring host computer by the webserver with it is upper
Machine monitoring control software is entered row information and mutually passed.
Transmitting fault information is passed through the webserver and host computer by described WIFI module to monitoring host computer, monitoring host computer
Monitoring control software is entered row information and mutually passed.
485 described circuits are taken transmitting fault information to monitoring host computer, monitoring host computer by wired mode by network
Business device enters row information with host computer monitoring control software and mutually passed.
Described civil power is by obtaining 3.3V voltages and low frequency to the power supply of MCU micro-control units after described power module
± 9V voltages required for signal conditioning circuit and high-frequency signal modulate circuit amplifier.
The fault arc detection device of this kind set communication compared with prior art, has following actively effect
Fruit：It is that fault electric arc is judged based on neural network algorithm and difference algorithm, increases the accuracy judged electric arc, subtracts
The malfunction of glitch electric arc breaker, fault electric arc can be not only detected, and SIM card, 485, wireless WIFI can be passed through
Fault message is uploaded to monitoring host computer processing.
Brief description of the drawings
Fig. 1 is the major loop schematic diagram of this example.
In figure：1st, low-frequency current transformer, 2, HF current transformer, 3, power module, 4, low frequency signal modulate circuit,
5th, high-frequency signal modulate circuit, 6, high frequency filter, 7, MCU micro-control units, 8, SIM card circuit, 9, load, 10, network clothes
It is engaged in device, 11, host computer, 12, civil power, 13, sound light alarming circuit, 14, reset circuit, 15, WIFI module, 16,485 circuits, 17,
Monitoring host computer.
Embodiment
The utility model is described again with reference to embodiment and its accompanying drawing.
Referring to Fig. 1, a kind of fault arc detection device for gathering communication, MCU micro-control units 7 connect respectively
High frequency filter 6, low frequency signal modulate circuit 4, SIM card circuit 8,485 circuits 16, WIFI module 16, high frequency filter 6 connect
High-frequency signal modulate circuit 5, the connecting line low-frequency current transformer 1 of low frequency signal modulate circuit 4, high-frequency signal modulate circuit 5 connects
Connect HF current transformer 2, civil power 12 after power module 3 by obtaining powering to MCU micro-control units 7 and low frequency signal is nursed one's health
Voltage required for circuit 4 and the amplifier of high-frequency signal modulate circuit 5.
Referring to Fig. 1, a kind of fault arc detection method for gathering communication, MCU micro-control units 7 connect respectively
High frequency filter 6, low frequency signal modulate circuit 4, SIM card circuit 8,485 circuits 16, WIFI module 16, high frequency filter 6 connect
High-frequency signal modulate circuit 5, low frequency signal modulate circuit 4 connect low-frequency current transformer 1, and high-frequency signal modulate circuit 5 connects
HF current transformer 2, civil power 12 by obtain powering to MCU micro-control units 7 after power module 3 and low frequency signal nurse one's health electricity
Voltage required for road 4 and the amplifier of high-frequency signal modulate circuit 5, low-frequency current transformer 1 are used for obtaining the electric current in major loop
Signal and voltage signal, and loadtype is identified by waveform, HF current transformer 2 is used for obtaining high-frequency impulse；Work as electricity
When serial arc or parallel arc occur for road, primary signal isolation is first narrowed down into certain limit through low-frequency current transformer 1, so
Signal is become by the scope that MCU micro-control units 7 can be handled by low frequency signal modulate circuit 4 afterwards, most afterwards through the micro- places of MCU
Unit 7 is managed to obtain voltage and current signal, obtains loadtype；HF current transformer 2 obtains band logical by high frequency filter 6
Signal, then the high-frequency signal between 30K-100K is obtained by high-frequency signal modulate circuit 5, input MCU micro-control units 7, lead to
The pulse that AD samples to obtain to be crossed to judge whether that arcing occurs, low-frequency current transformer 1 obtains the current signal in major loop, secondly
Current signal is become voltage signal U by the current signal I of secondary side by low frequency signal modulate circuit 4, then to voltage signal U
Rectification is carried out, the signal after rectification is transmitted to MCU micro-control units 7, HF current transformer 2 is obtained by high frequency filter 6
Bandpass signal, then obtain high-frequency signal PLUSE1, MCU the microcontroller list between 30K-100K by high-frequency signal modulate circuit 5
Member 7 collection high-frequency signal PLUSE1 information, the change of current spectrum in major loop is detected by difference algorithm by A/D passages
Change, carry out the judgement of fault electric arc, it is due to the normal startup loaded in circuit to distinguish, and is also due to the power adjusting of load
Still there occurs fault electric arc for caused interference.
Referring to Fig. 1, described MCU micro-control units 7 are also connected with reset circuit 14.
Referring to Fig. 1, described MCU micro-control units 7 are also connected with sound light alarming circuit 13.
Referring to Fig. 1, transmitting fault information is passed through network by described SIM card circuit 8 to monitoring host computer 17, monitoring host computer 17
Server 10 monitors that control software is entered row information and mutually passed with host computer 11.
Referring to Fig. 1, transmitting fault information is passed through network by described WIFI module 15 to monitoring host computer 17, monitoring host computer 17
Server 10 monitors that control software is entered row information and mutually passed with host computer 11.
Referring to Fig. 1,485 described circuits 16 are by wired mode, by transmitting fault information to monitoring host computer 17, monitoring master
Machine 17 monitors that control software is entered row information and mutually passed by the webserver 10 with host computer 11.
Referring to Fig. 1, described civil power 12 is by obtaining what is powered to MCU micro-control units 7 after described power module 3
± 9V voltages required for 3.3V voltages and low frequency signal modulate circuit 4 and the amplifier of high-frequency signal modulate circuit 5.
Difference algorithm：To be drawn by observing substantial amounts of experimental data, when break down electric arc when, the electric current meeting of major loop
There is high fdrequency component, because high fdrequency component is in itself easily by transition resistance, the influence of transmission range so that collect to obtain signal
In high fdrequency component amplitude it is very small, sometimes even can be fallen into oblivion by the larger fundamental wave of amplitude, subharmonic, or DC component
Not yet.Traditional band logical or high frequency filter is difficult the high fdrequency component required for accurate obtain, but calculus of differences is in certain bar
Into the property of approximation relation under part, high-frequency signal can effectively be amplified according to this feature difference algorithm, low frequency signal of decaying.
Difference algorithm general principle：Y (t)=x (t)-x (t- Δs t)=Δ t* (x (t)-x (t- Δs t))/Δ t
Wherein：X (t) represents t and collects to obtain data
(t- Δs t) represents the data that t- time Δts are collected to x
Δ t represents sampling time interval
Y (t) represents differentiated signal
By above formula it can be seen that when sample frequency is higher Δ t --- → dt, x (t)-x (t- Δs t) --- → dx (t)
So there is y (t)=Δ t*dx (t)/dt=x'(t) * Δs t
Influence of the difference algorithm to waveform：Chip Microcomputer A/D channel reception to signal can there is one group N number of to there is a tentering
The SIN function composition of value, frequency, and phase：
K represents overtone order in above formula,
W represents fundamental wave angular frequency
γkRepresent initial phase angle
So after difference
Have above formula we can draw carry out difference processing after, the amplitude of each frequency component is changed into t times original of kw Δs,
Frequency is higher, and multiplication factor is bigger.Using the amplitude of fundametal compoment before and after difference as reference pair picture, keep its amplitude constant, by difference
Signal divided by w Δs t after point obtain
There are (1) formula and (3) formula, can obtain that the frequency of each component after difference in input signal is constant, and amplitude expands kw
Times.
The primary signal of a cycle is become into bandpass signal after signal processing, data acquisition is carried out by A/D passages,
Then FFT computings are carried out, the points of FFT computings are N, sample frequency fs.Consequent difference fortune is carried out to the data in this cycle
Calculate.
Take M (M>10) the individual cycle carries out the data after calculus of differences, asks poor to adjacent periods frequency identical harmonic component,
Summation is carried out to it again to be put into array sum_buf [M/2], when break down electric arc when, the element in sum_buf is more than threshold value
K(L<M/2 number L1 showed increaseds).Tested by a large amount of different load tests, a threshold value L2 can be set, if L1
>L2 then circuit malfunctions electric arcs.
BP neural network algorithm：Drawn by various complicated load tests, the waveform of every kind of load is distinguishing, root
According to this characteristic, can be trained using BP neural network algorithm, so as to identify loadtype.
(1) initialize, give each connection weight [w], [v] and threshold values θ i, rt at random.
(2) by given input and output mode to calculating hidden layer, the output of output layer each unit
Bj=f (wijai- θ j) ct=f (vjtbj-rt)
In formula：Bj is j-th of neuron reality output of hidden layer；Ct is the reality output of t-th of neuron of output layer；wij
For the connection weight of input layer to hidden layer；Vjt is connection weight of the hidden layer to output layer.
Dtk=(ytk-ct) ct (1-ct) ejk=[dtvjt] bj (1-bj)
(3) choose next input pattern and reach requirement knot until network sets output error to returning to the 2nd step repetition training
Shu Xunlian.
Claims (7)
1. a kind of fault arc detection device for gathering communication, it is characterized in that：MCU micro-control units (7) connect respectively
High frequency filter (6), low frequency signal modulate circuit (4), SIM card circuit (8), 485 circuits (16), WIFI module (15) are connect, it is high
Frequency wave filter (6) connection high-frequency signal modulate circuit (5), low frequency signal modulate circuit (4) connecting line low-frequency current transformer
(1), high-frequency signal modulate circuit (5) connection HF current transformer (2), civil power (12) by obtained after power module (3) to
Electricity required for MCU micro-control units (7) power supply and low frequency signal modulate circuit (4) and high-frequency signal modulate circuit (5) amplifier
Pressure.
2. a kind of fault arc detection device for gathering communication according to claim 1, it is characterized in that：It is described
MCU micro-control units (7) be also connected with reset circuit (14).
3. a kind of fault arc detection device for gathering communication according to claim 1, it is characterized in that：It is described
MCU micro-control units (7) be also connected with sound light alarming circuit (13).
4. a kind of fault arc detection device for gathering communication according to claim 1, it is characterized in that：It is described
SIM card circuit (8) give transmitting fault information to monitoring host computer (17), monitoring host computer (17) by the webserver (10) with it is upper
Position machine (11) monitoring control software is entered row information and mutually passed.
5. a kind of fault arc detection device for gathering communication according to claim 1, it is characterized in that：It is described
WIFI module (15) give transmitting fault information to monitoring host computer (17), monitoring host computer (17) by the webserver (10) with it is upper
Position machine (11) monitoring control software is entered row information and mutually passed.
6. a kind of fault arc detection device for gathering communication according to claim 1, it is characterized in that：It is described
485 circuits (16) by wired mode, give transmitting fault information to monitoring host computer (17), monitoring host computer (17) is taken by network
Business device (10) enters row information with host computer (11) monitoring control software and mutually passed.
7. a kind of fault arc detection device for gathering communication according to claim 1, it is characterized in that：It is described
Civil power (12) by obtained after described power module (3) to MCU micro-control units (7) power 3.3V voltages and low frequency believe
± 9V voltages required for number modulate circuit (4) and high-frequency signal modulate circuit (5) amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720716727.9U CN206930727U (en) | 2017-06-20 | 2017-06-20 | A kind of fault arc detection device for gathering communication |
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| CN201720716727.9U CN206930727U (en) | 2017-06-20 | 2017-06-20 | A kind of fault arc detection device for gathering communication |
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| CN206930727U true CN206930727U (en) | 2018-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085158A (en) * | 2017-06-20 | 2017-08-22 | 浙江中科城安消防科技有限公司 | A kind of fault arc detection device and method for gathering communication |
| CN112986743A (en) * | 2021-03-31 | 2021-06-18 | 国网河南省电力公司电力科学研究院 | Active intervention type arc suppression device test system function system |
-
2017
- 2017-06-20 CN CN201720716727.9U patent/CN206930727U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085158A (en) * | 2017-06-20 | 2017-08-22 | 浙江中科城安消防科技有限公司 | A kind of fault arc detection device and method for gathering communication |
| CN112986743A (en) * | 2021-03-31 | 2021-06-18 | 国网河南省电力公司电力科学研究院 | Active intervention type arc suppression device test system function system |
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