CN106990282A - Multi channel currents sensor is used in direct-current arc detection - Google Patents
Multi channel currents sensor is used in direct-current arc detection Download PDFInfo
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- CN106990282A CN106990282A CN201710258043.3A CN201710258043A CN106990282A CN 106990282 A CN106990282 A CN 106990282A CN 201710258043 A CN201710258043 A CN 201710258043A CN 106990282 A CN106990282 A CN 106990282A
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- signal
- sensor
- analog switch
- current
- signal processor
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
-
- 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
Abstract
The invention discloses a kind of direct-current arc detection multi channel currents sensor, including multiple sense channels, analog switch, current transformer, operational amplifier, bandwidth-limited circuit, signal processor, current signal in current transformer acquisition testing passage, and determine whether electric arc by the first operational amplifier, bandwidth-limited circuit, analog-digital converter, signal processor processes, first analog switch is by signal processor control, to select the signal for inputting current transformer in certain road sense channel；Also include Hall sensor, Hall sensor measurement electric current is exported by the second operational amplifier, analog-digital converter, signal processor processes；Second analog switch, the 3rd analog switch have signal processor control, and the selection of the second analog switch inputs the signal input analog-to-digital converter of the signal of Hall sensor in certain road sense channel, the 3rd analog switch selection current transformer or Hall sensor collection.
Description
Technical field
The present invention relates to the current sensor of field of photovoltaic power generation, the current sense of photovoltaic DC arcing is especially detected
Device.
Background technology
With the popularization of the development of photovoltaic generation, especially distributed photovoltaic power generation, the security to photovoltaic plant is proposed
Higher and higher requirement.There are numerous contacts that are electrically connected in photovoltaic generating system, and the DC voltage of photovoltaic generating system is got over
Come higher, if bad connection occurs in tie point, phenomenon of arc discharge just occurs, and because photovoltaic system is direct current, do not have
There is zero crossing, so this electric arc is not easy to extinguish once burning, serious harm can be caused.The lighter burns electrical equipment,
Severe one causes fire.So, be before electric arc does not also form disaster circuit cut-out extinguishing electric arc.Photovoltaic arc-detection is just
It is to detect in real time either with or without generation electric arc in photovoltaic straight-flow system, once electric arc is found, and the intensity of electric arc reaches protection
Level will send signal in time, go operating breaker line disconnection.Currently there are many kinds of photovoltaic DC arc-detection technologies, it is main
Integrally to be exported for integrated arcing, current detecting or pass through high frequency CT and current detecting split output.But major defect is overall
System cost is high, and accuracy of detection is low.
Such as notification number discloses a kind of photovoltaic electric arc detection sensor for CN205620492U Chinese patent literature, by
Hall current sensor, differential circuit, bandpass filter, modulus sampling and digital processing circuit composition, Hall current sensor
The signal of output becomes differential signal by differential circuit, and differential signal retains the frequency sensitive to electric arc by bandpass filter
Section, and other frequency ranges are removed, electric arc then is detected whether to calculate by modulus sampling and digital processing circuit, if electricity
Arc is issued by alarm signal.The signal of Hall current sensor output is also directly connected with analog sampling and digital processing circuit,
Thus measure the size of photovoltaic electric current.The program uses single-chip microcomputer by the 20KHz after bandpass filtering to 200KHz band logical
Calculate and judge output arc signal, resolution ratio, the speed of the program is not high, easily cause wrong report or fail to report arcing state.
The content of the invention
The technical problems to be solved by the invention are to overcome the above-mentioned not enough of prior art and provide a kind of direct-current arc inspection
Multi channel currents sensor is used in survey, realizes that arcing is detected fast and in high precision.
The present invention the used technical scheme that solves the above problems is：Multi channel currents sensor is used in direct-current arc detection,
Including multiple sense channels, analog switch, current transformer, operational amplifier, bandwidth-limited circuit, signal processor, electric current
Current signal in transformer acquisition testing passage, and current signal is converted into voltage by the first operational amplifier believes and put
Greatly, high low-pass filtering treatment is carried out by bandwidth-limited circuit after the first analog switch, exported after the 3rd analog switch
To analog-digital converter, signal processor is output to after analog-to-digital conversion, signal processor is the programmable processing of more than 16
Device, assesses whether electric arc, and assessment signal is exported by Interface Terminal by fast Fourier algorithm；First simulation
Switch is by signal processor control, to select the signal for inputting current transformer in certain road sense channel；The sensor is also wrapped
Hall sensor, the second operational amplifier, the second analog switch are included, Hall sensor measurement electric current passes through the second operation amplifier
Device carries out second-order low-pass filter active power filtering conditioning, by the 3rd analog switch input analog-to-digital converter and passes to signal transacting
Device processing output；Second analog switch, the 3rd analog switch have signal processor control, and the selection of the second analog switch inputs certain road
The signal of the signal of Hall sensor in sense channel, the 3rd analog switch selection current transformer or Hall sensor collection is defeated
Enter analog-digital converter.
The high LPF process circuit is low by a four limit Butterworth high-pass filtering circuits and five limits
Bandpass filter circuit is constituted.
The Interface Terminal of the signal processor is multiple, including communication interface, communication power supply interface, the switching value of electric arc
Output interface.
The signal processor is connected with charactron, and numeral method is tested the electric current, voltage, arcing state of Measurement channel
Information.
The sensor also carries switching key, the information of switching key control selections numeral method.
The signal processor is connected with indicator lamp, the running status of indication sensor.
The Hall sensor is programmable hall sensor.
Compared with prior art, the advantage of the invention is that：Analog switch is controlled quickly to cut by signal processor
Electric arc, current detecting passage are changed, and signal processor is the programmable processor of more than 16, and calculated by fast Fourier
Method is calculated, and the response time for testing and analyzing arcing is fast.Current transformer and Hall sensor current detecting split output, are added
The reliability of arc-detection.High LPF process circuit is by a four limit Butterworth high-pass filtering circuits and five poles
Point low-pass filter circuit composition, can form 40KHz to 100KHz bandpass filtering, improve detection resolution.Signal processor leads to
Cross setting interface and realize communication, on-off model transmission etc., the work of sensor can be intuitively shown with charactron, indicator lamp etc.
Make state.
Brief description of the drawings
Fig. 1 is the theory diagram of the embodiment of the present invention.
Fig. 2 is the operational amplification circuit in arc detection circuitry in Fig. 1.
Fig. 3 is the high LPF process circuit in arc detection circuitry in Fig. 1.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is further described for embodiment.
Embodiment, the sensor includes shell, cap, detection components, and detection components are located at the chamber that shell and cap are surrounded
In vivo, detection components include electric current and electric arc collection magnetic core, current transformer, Hall sensor, multiple analog switches, interface end
Son, charactron, switching key, indicator lamp, operational amplifier, analog-digital converter, signal processor, its theory diagram such as Fig. 1 institutes
Show.
Electric current and electric arc collection magnetic core have 16 groups, that is, have 16 road sense channels, have electric current per road sense channel
Transformer and current sensor（Hall sensor）Gather its current signal.
Arc detection circuitry include current transformer, the first operational amplifier, the first analog switch, bandwidth-limited circuit,
3rd analog switch, analog-digital converter, signal processor.Current detection circuit include Hall sensor, the second operational amplifier,
Second analog switch, the 3rd analog switch, analog-digital converter, signal processor.Wherein arc detection circuitry and current detecting is electric
Road shares the 3rd analog switch, analog-digital converter, signal processor.3rd analog switch is by signal processor control, to select
The signal of input analog-to-digital converter is the signal of current transformer or Hall sensor collection.First analog switch, the second mould
Intend switch by signal processor control, to select the signal output of the current transformer of which sense channel, Hall sensor
To subsequent conditioning circuit.
Current transformer is HF current transformer, and for gathering photovoltaic group string current signal, output to the first computing is put
Integrated operational amplifier circuit, operational amplification circuit in big device, operational amplifier as shown in Fig. 2 operational amplifier is powered using 5V,
Bias voltage is the half of supply voltage.Current signal is converted to voltage signal by the first operational amplifier, by voltage amplification 10
High low-pass filtering treatment, high LPF process circuit are carried out by bandwidth-limited circuit after the selection of the first analog switch after times
As shown in figure 3, high LPF process circuit is by a four limit Butterworth high-pass filtering circuits and five pole lowpass
Filter circuit is constituted, and is output to analog-digital converter by the 3rd analog switch after signal amplification, is output to after analog-to-digital conversion
Signal processor, this bandwidth-limited circuit formation 40KHz to 100KHz bandpass filtering, so that signal processor processes electric arc
The effect of data is more efficient.
Signal processor is more than 16 framework programmable processors, passes through fast Fourier algorithm（FFT）Detect direct current
The amplitude of high-frequency noise in bus（Peak value）Change, then assesses whether occur arc event.Accurate algorithm can be improved
The success rate of fault electric arc detection, and reduce rate of false alarm.When detecting arc event, driven using pulse width modulation
Simulation output closes the connection that leading portion breaker instrument disconnects solar panels string, and trigger signal device（Sound and/or visual police
Report）, by the use of numeral output as communication interface to send a message to remote controllers, this communication interface can also be used remote
Cheng Qidong self-inspections.
Hall sensor is mainly used in measuring the electric current in photovoltaic panel, and step low-pass filter is carried out by the second operational amplifier
Ripple active power filtering is nursed one's health, and is then passed through the second analog switch, the 3rd analog switch input analog-to-digital converter and is passed at signal
Reason device is further processed, and Hall sensor uses programmable hall sensor.
Signal processor is connected with multiple Interface Terminals, charactron, indicator lamp, and multiple Interface Terminals can be used as lightning protection state
On-off signal, communication interface, communication power supply, differential voltage input, the On-off signal of circuit-breaker status, the switching value of electric arc
Output, spare interface etc..Numeral method is tested the information such as sequence number, electric current, voltage, the arcing state of Measurement channel, switching
The information of the changeable selection numeral method of button.Indicator lamp is used for the communication state and running status of indication sensor.
Claims (7)
1. multi channel currents sensor is used in direct-current arc detection, it is characterised in that：The sensor includes multiple sense channels, mould
Intend in switch, current transformer, operational amplifier, bandwidth-limited circuit, signal processor, current transformer acquisition testing passage
Current signal, and current signal is converted into voltage by the first operational amplifier believes and amplify, after the first analog switch
High low-pass filtering treatment is carried out by bandwidth-limited circuit, analog-digital converter is output to after the 3rd analog switch, by modulus
Signal processor is output to after conversion, signal processor is the programmable processor of more than 16, passes through fast Fourier algorithm
Electric arc is assessed whether, and assessment signal is exported by Interface Terminal；First analog switch by signal processor control,
To select the signal for inputting current transformer in certain road sense channel；
The sensor also includes Hall sensor, the second operational amplifier, the second analog switch, Hall sensor measurement electricity
Stream, second-order low-pass filter active power filtering conditioning is carried out by the second operational amplifier, is turned by the 3rd analog switch input modulus
Parallel operation simultaneously passes to signal processor processes output；Second analog switch, the 3rd analog switch have signal processor control, second
Analog switch selection inputs the signal of Hall sensor in certain road sense channel, the 3rd analog switch selection current transformer or suddenly
The signal input analog-to-digital converter of your sensor collection.
2. multi channel currents sensor is used in direct-current arc detection according to claim 1, it is characterised in that：The high low pass
Filtering process circuit is made up of a four limit Butterworth high-pass filtering circuits and a five pole lowpass filter circuits.
3. multi channel currents sensor is used in direct-current arc detection according to claim 1, it is characterised in that：At the signal
It is multiple to manage the Interface Terminal of device, includes the output switch parameter interface of communication interface, communication power supply interface, electric arc.
4. multi channel currents sensor is used in direct-current arc detection according to claim 1, it is characterised in that：At the signal
Reason device is connected with charactron, and numeral method is tested the electric current, voltage, arcing status information of Measurement channel.
5. multi channel currents sensor is used in direct-current arc detection according to claim 4, it is characterised in that：The sensor
Also carry switching key, the information of switching key control selections numeral method.
6. multi channel currents sensor is used in direct-current arc detection according to claim 1, it is characterised in that：At the signal
Reason device is connected with indicator lamp, the running status of indication sensor.
7. multi channel currents sensor is used in direct-current arc detection according to claim 1, it is characterised in that：The Hall is passed
Sensor is programmable hall sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710258043.3A CN106990282A (en) | 2017-04-19 | 2017-04-19 | Multi channel currents sensor is used in direct-current arc detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710258043.3A CN106990282A (en) | 2017-04-19 | 2017-04-19 | Multi channel currents sensor is used in direct-current arc detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106990282A true CN106990282A (en) | 2017-07-28 |
Family
ID=59415525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710258043.3A Pending CN106990282A (en) | 2017-04-19 | 2017-04-19 | Multi channel currents sensor is used in direct-current arc detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414960A (en) * | 2018-04-13 | 2018-08-17 | 南京丹迪克电力仪表有限公司 | A kind of multichannel directly measures formula mutual-inductor tester and method of calibration |
| CN109975669A (en) * | 2019-04-04 | 2019-07-05 | 苏州易启康电子科技有限公司 | Arc current intelligent detection module and its working method |
| CN110261745A (en) * | 2019-06-28 | 2019-09-20 | 西安交通大学 | A kind of DC Line Fault electric arc detecting device and method based on arc light and current signal |
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| CN102253293A (en) * | 2011-05-30 | 2011-11-23 | 南京航空航天大学 | Detection method and device of direct current arc faults |
| CN102687357A (en) * | 2009-12-15 | 2012-09-19 | 伊顿公司 | Direct current arc fault circuit interrupter, direct current arc fault detector, noise blanking circuit for a direct current arc fault circuit interrupter, and method of detecting arc faults |
| CN202586499U (en) * | 2012-04-01 | 2012-12-05 | 上海晖保新能源科技有限公司 | Intelligent arc detection device used for photovoltaic-power-station direct current side |
| CN104092440A (en) * | 2014-07-21 | 2014-10-08 | 阳光电源股份有限公司 | Photovoltaic system direct-current arc fault detection method, device, processor and system |
| CN104685747A (en) * | 2012-09-28 | 2015-06-03 | 伊顿公司 | Direct current arc fault detector and circuit interrupter, and method of detecting an arc in a direct current power circuit |
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| CN102687357A (en) * | 2009-12-15 | 2012-09-19 | 伊顿公司 | Direct current arc fault circuit interrupter, direct current arc fault detector, noise blanking circuit for a direct current arc fault circuit interrupter, and method of detecting arc faults |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414960A (en) * | 2018-04-13 | 2018-08-17 | 南京丹迪克电力仪表有限公司 | A kind of multichannel directly measures formula mutual-inductor tester and method of calibration |
| CN109975669A (en) * | 2019-04-04 | 2019-07-05 | 苏州易启康电子科技有限公司 | Arc current intelligent detection module and its working method |
| CN110261745A (en) * | 2019-06-28 | 2019-09-20 | 西安交通大学 | A kind of DC Line Fault electric arc detecting device and method based on arc light and current signal |
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Application publication date: 20170728 |
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