CN206321731U - A kind of fault arc detection device - Google Patents
A kind of fault arc detection device Download PDFInfo
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- CN206321731U CN206321731U CN201720021347.3U CN201720021347U CN206321731U CN 206321731 U CN206321731 U CN 206321731U CN 201720021347 U CN201720021347 U CN 201720021347U CN 206321731 U CN206321731 U CN 206321731U
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Abstract
The utility model provides a kind of fault arc detection device, including：Analog-digital converter ADC, digital signal processor DSP and microcontroller；The ADC is used to send to DSP from straight-flow system receiving voltage signal, and by the voltage signal；The DSP be used for according to the voltage signal obtain the interval harmonic content of the first preset frequency and, and according to the harmonic content and judge whether the straight-flow system occurs DC Line Fault electric arc, and will determine that result is sent to MCU.Fault electric arc in detection straight-flow system is realized by the utility model, before electric arc further produces harm or even causes fire, alarm signal and in time cut-out straight-flow system circuit is sent, protects straight-flow system.
Description
Technical field
The utility model is related to DC system fault arc-detection field, and in particular to a kind of fault arc detection device.
Background technology
Photovoltaic generation is considered as safety and does not have influential green energy resource on environment.But, with the height of photovoltaic industry
Speed growth and the gradually aging of the photo-voltaic power generation station put into operation so that photovoltaic generating system failure is more and more frequent, and direct current
Fault electric arc is one of failure of photovoltaic generating system.
The voltage of photovoltaic system DC terminal output becomes big with increasing for photovoltaic array, and the voltage of general photovoltaic plant reaches
To several hectovolts to upper kilovolt.It is more dangerous than AC fault electric arc due to there is no zero passage point protection if producing fault electric arc,
Simultaneously under the cut-off current characteristics of photovoltaic module and the collective effect of illumination electric current autonomous behavior so that fault electric arc has stable combustion
Burn environment.It such as can not in time dispose, maximum loss can be caused to photovoltaic module and transmission line of electricity, fire can be caused when more serious
Calamity, causes huge economic loss and casualties.
If the generation of electric arc can timely be monitored in the starting stage of photovoltaic DC fault electric arc, and cut off and electricity
The connected circuit of arc, can avoid leading to serious consequence, retrieve huge economic loss.Thus, researching DC fault electric arc
The principle of generation and corresponding parameter, propose effective comprehensively monitoring DC Line Fault arc technology, and in the photovoltaic production in future
Applied in product, the competitiveness of product can be lifted and suit the demand in market.
Utility model content
In view of this, the utility model embodiment provides a kind of fault arc detection device, to solve in the prior art
Straight-flow system is not due to having zero passage point protection, if the problem of generation fault electric arc can cause fire when serious.
Therefore, the utility model embodiment provides following technical scheme：
The utility model embodiment provides a kind of fault arc detection device, including：Analog-digital converter ADC, number
Word signal processor DSP and microcontroller；The ADC is used to believe from straight-flow system receiving voltage signal, and by the voltage
Number send to the DSP；The DSP be used for according to the voltage signal obtain the interval harmonic content of the first preset frequency and,
And according to the harmonic content and judge whether the straight-flow system occurs DC Line Fault electric arc, and will determine that result is sent to institute
State MCU.
Alternatively, the fault arc detection device also includes：Hall sensor, the Hall sensor is connected to described
ADC input, the current signal for the straight-flow system to be exported is converted to the voltage signal.
Alternatively, the fault arc detection device also includes：Voltage network, the voltage network connection is extremely
The input of the ADC, the voltage conversion for the straight-flow system to be exported is the voltage signal.
Alternatively, the fault arc detection device also includes：Analog signal isolating chip, the analog signal isolating core
Piece input is connected to the voltage network, and output end is connected to the ADC.
Alternatively, the fault arc detection device also includes：Magnetic isolation chip, the input of the Magnetic isolation chip connects
The ADC is connected to, output end is connected to the DSP.
Alternatively, the band of the ADC is wider than 100kHz.
Alternatively, multiple serial communications are used between the DSP and the MCU, communication process is deposited using direct memory
Take dma mode.
Alternatively, the MCU includes liquid crystal display lcd controller and touch screen controller.
Alternatively, the DSP is used to the voltage signal passing through the digital band-pass filter during the second preset frequency
After being filtered to the voltage signal, carry out fast Fourier transform fft analysis and obtain frequency spectrum, and the frequency spectrum is carried out smoothly
Filter integer, according to the frequency spectrum after integer obtain the harmonic content and.
Alternatively, the FFT is used calculates harmonic wave based on temporal decimation method.
The utility model embodiment technical scheme, has the following advantages that：
The utility model provides a kind of fault arc detection device, including：Analog-digital converter ADC, data signal
Processor DSP and microcontroller；The ADC be used for from straight-flow system receiving voltage signal, and by the voltage signal send to
DSP；The DSP be used for according to the voltage signal obtain the interval harmonic content of the first preset frequency and, and according to the harmonic content
With judge whether the straight-flow system occurs DC Line Fault electric arc, and will determine that result is sent to MCU.Straight-flow system in the prior art
, can be more dangerous than AC fault electric arc if producing arc fault due to there is no zero passage point protection, if can not handle in time, meeting
Heavy losses are caused to transmission line of electricity, fire can be caused when serious, huge economic loss and casualties is caused.By this reality
With the fault arc detection device in new, the fault electric arc in detection straight-flow system is realized, danger is further produced in electric arc
Evil even causes before fire, sends alarm signal and in time cut-out straight-flow system circuit, protects straight-flow system.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The accompanying drawing to be used needed for embodiment or description of the prior art is briefly described, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structure chart of the fault arc detection device according to the utility model embodiment；
Fig. 2 is a structure chart of the fault arc detection device according to the utility model embodiment；
Fig. 3 is the current sample schematic diagram of the fault arc detection device according to the utility model embodiment；
Fig. 4 is another structure chart of the fault arc detection device according to the utility model embodiment；
Fig. 5 is the voltage sample schematic diagram of the fault arc detection device according to the utility model embodiment；
Fig. 6 is another structure chart of the fault arc detection device according to the utility model embodiment；
Fig. 7 is the data transfer separation principle figure of the fault arc detection device according to the utility model embodiment；
Fig. 8 is another structure chart of the fault arc detection device according to the utility model embodiment.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is a part of embodiment of the utility model, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation or position relationship of the instruction such as " level ", " interior ", " outer " are, based on orientation shown in the drawings or position relationship, to be only
Described for the ease of description the utility model and simplifying, rather than to indicate or imply that signified device or element must have specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary,
The connection of two element internals is can also be, can be wireless connection or wired connection.For the common skill of this area
For art personnel, concrete meaning of the above-mentioned term in the utility model can be understood with concrete condition.
As long as in addition, technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can just be combined with each other.
Embodiment 1
A kind of fault arc detection device is provided in the present embodiment, as shown in figure 1, including：Analog-digital converter
ADC12, digital signal processor DSP 13 and microcontroller 14, the ADC12 are used for from the receiving voltage signal of straight-flow system 11,
And send the voltage signal to DSP13, the DSP13 is used to obtain the interval harmonic wave of the first preset frequency according to the voltage signal
Content and, can be 30kHz to 80kHz during first preset frequency, and according to the harmonic content with judge the straight-flow system
Whether occur DC Line Fault electric arc, and will determine that result is sent to MCU14.In this alternative embodiment, ADC12 chip bandwidth
More than 100Kz, so as to extract 10kHz to 100kHz frequency spectrum, multiple serial communications are used between DSP13 and MCU14, are led to
Letter process uses direct memory access mode, reduces the interference of DSP13 and MCU14 to communication process, improves
DSP13 and MCU14 service efficiency, MCU14 includes liquid crystal display lcd controller and touch screen controller.
Straight-flow system, can be than AC fault electric arc more if producing arc fault due to not having zero passage point protection in the prior art
Plus it is dangerous, if can not handle in time, heavy losses can be caused to transmission line of electricity, fire can be caused when serious, cause huge
Economic loss and casualties.Fault arc detection device in this alternative embodiment, realizes the electricity in measurement straight-flow system
Fault electric arc in stream, voltage, power, electric energy and detection straight-flow system, further produces harm in electric arc or even causes fire
Before calamity, alarm signal and in time cut-out straight-flow system circuit are sent, straight-flow system is protected.
Fig. 2 is a structure chart of the fault arc detection device according to the utility model embodiment.As shown in Fig. 2 therefore
Hindering electric arc detecting device also includes Hall sensor 22, and the Hall sensor 22 is connected to ADC23 input, for by direct current
The current signal of system output is converted to below 5V voltage signal, and the Hall sensor can be wideband Hall sensor.Should
Hall sensor is as shown in Figure 3 to the sample circuit schematic diagram of electric current.
Fig. 4 is another structure chart of the fault arc detection device according to the utility model embodiment.As shown in figure 4,
Fault arc detection device also includes voltage network 42, and the voltage network 42 is connected to ADC44 input, is used for
The voltage conversion that the straight-flow system is exported is below 5V voltage signal, hardware circuit is reduced as far as possible, the voltage
The schematic diagram of network is as shown in Figure 5.
As shown in figure 4, fault arc detection device also includes analog signal isolating chip 43, the analog signal isolating chip
43 inputs are connected to voltage network 42, and output end is connected to ADC44, it is ensured that the electric peace of strong power system and weak electricity system
Full performance, it is to avoid the Danger Electric shock risk that people's contact device is caused, meanwhile, reduce external interference and ADC A/D conversion systems are made an uproar
Acoustic jamming.
Fig. 6 is another structure chart of the fault arc detection device according to the utility model embodiment.As shown in fig. 6,
Fault arc detection device also includes Magnetic isolation chip 63, and the input of the Magnetic isolation chip 63 is connected to ADC62, and output end connects
It is connected to DSP64.The speed of the Magnetic isolation chip 63 can reach 50Hz, meet ADC62 analog-to-digital conversion rate requirements, while can keep away
Exempting from DSP64 interference signal influences ADC62 conversion accuracy, and the schematic diagram of the data transfer isolation circuit is as shown in Figure 7.Should
Serial communication is used between ADC62 and DSP63, DSP receives the initial data after ADC62 analog-to-digital conversions using dma mode, because
ADC conversion speeds are fast to be received mode using DMA, can mitigate DSP CPU burdens up to 256kHz, DSP, is conducive to DSP to improve number
According to the efficiency of analysis.
Fig. 8 is another structure chart of the fault arc detection device according to the utility model embodiment.As shown in figure 8,
The DC current signal of input is converted to voltage signal by wideband Hall sensor, and the voltage signal passes through ADC sample conversions
For data signal；The voltage signal of input obtains below 5V voltage signal by voltage network, and the voltage signal passes through
Analog signal isolating chip is delivered to ADC sample conversions for data signal, the numeral letter after ADC is changed by Magnetic isolation chip
Number it is delivered to DSP.The DSP is responsible for the realization of DC measurement algorithm and the realization of DC Line Fault arc-detection algorithm, is adopted using fixed point
Sample, fixed cycle calculating current, voltage, power and electric energy.DSP is by the digital band-pass filter during the second preset frequency to institute
State after voltage signal is filtered, carry out fast Fourier transform fft analysis and obtain frequency spectrum, and smothing filtering is carried out to the frequency spectrum
Integer, obtains the harmonic content according to the frequency spectrum after integer and specifically, the DSP passes through one to input signal first
The low pass filter of 10kHz high-pass digital filter and a 100kHz, filters incoherent noise signal, then using base
Harmonic wave computing is carried out in the FFT of temporal decimation method and obtains 1023 subharmonic that 100Hz is fundamental wave, and the harmonic wave can be voltage, electricity
Stream, power, the harmonic wave of electric energy and voltage x current, maximum can be entered with the harmonic content of computing to 123kHz to spectrum harmonics curve
The smooth integer of row, then to 30kHz to 80kHz harmonic content summation, is then compared, if continuously with predetermined threshold
In 0.8s time range, the harmonic content and more than predetermined threshold number of times more than the second predetermined threshold, then judge faulty
Electric arc is produced.Wherein, the fft analysis is used calculates harmonic wave based on temporal decimation method, and no floating point arithmetic greatly improves computing speed
Degree.
As shown in figure 8, communication is received between DSP and memory and random access memory ram and transmission data are used
Dma mode.MCU is responsible for interface alternation, specifically includes communications protocol, On-off signal, output switch parameter, data storage, failure
Electric arc is alarmed and related relay output function, integrated friendly display interface, and IEC61850, Modbus/RTU can be used,
Modbus/TCP agreements and external communication.This alternative embodiment uses TFT color LCD touch-screens, and main interface uses virtual push button
Instead of mechanical key.
In summary, by above-mentioned fault arc detection device, solve in the prior art straight-flow system due to not having
Zero point is protected, can be more dangerous than AC fault electric arc if producing arc fault, can be to transmission line of electricity if can not handle in time
Heavy losses are caused, fire can be caused when serious, the problem of causing huge economic loss and casualties.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among the protection domain that variation is created still in the utility model.
Claims (10)
1. a kind of fault arc detection device, it is characterised in that including：Analog-digital converter ADC, digital signal processor
DSP and microcontroller；
The ADC is used to send to the DSP from straight-flow system receiving voltage signal, and by the voltage signal；
The DSP be used for according to the voltage signal obtain the interval harmonic content of the first preset frequency and, and according to described humorous
Ripple content and judge whether the straight-flow system occurs DC Line Fault electric arc, and will determine that result is sent to the MCU.
2. fault arc detection device according to claim 1, it is characterised in that also include：Hall sensor, it is described suddenly
Your sensor is connected to the input of the ADC, and the current signal for the straight-flow system to be exported is converted to the voltage
Signal.
3. fault arc detection device according to claim 1, it is characterised in that also include：Voltage network, it is described
Voltage network connection is to the input of the ADC, and the voltage conversion for the straight-flow system to be exported is the voltage
Signal.
4. fault arc detection device according to claim 3, it is characterised in that also include：Analog signal isolating chip,
The analog signal isolating chip input is connected to the voltage network, and output end is connected to the ADC.
5. fault arc detection device according to claim 1, it is characterised in that also include：Magnetic isolation chip, the magnetic
The input of isolating chip is connected to the ADC, and output end is connected to the DSP.
6. fault arc detection device according to claim 1, it is characterised in that the band of the ADC is wider than 100kHz.
7. fault arc detection device according to claim 1, it is characterised in that used between the DSP and the MCU
Multiple serial communications, communication process uses direct memory access mode.
8. fault arc detection device according to claim 1, it is characterised in that the MCU is controlled including liquid crystal display LCD
Device and touch screen controller processed.
9. fault arc detection device according to claim 1, it is characterised in that the DSP is used to make a reservation for by second
After digital band-pass filter during frequency is filtered to the voltage signal, carries out fast Fourier transform fft analysis and obtain
Frequency spectrum, and smothing filtering integer is carried out to the frequency spectrum, according to the frequency spectrum after integer obtain the harmonic content and.
10. fault arc detection device according to claim 9, it is characterised in that the FFT, which is used, is based on temporal decimation
Method calculates harmonic wave.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720021347.3U CN206321731U (en) | 2017-01-09 | 2017-01-09 | A kind of fault arc detection device |
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| CN201720021347.3U CN206321731U (en) | 2017-01-09 | 2017-01-09 | A kind of fault arc detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809255A (en) * | 2018-04-27 | 2018-11-13 | 国网安徽省电力有限公司六安供电公司 | A kind of photovoltaic generating system DC side arc fault method for comprehensive detection and system |
| CN111289852A (en) * | 2020-02-24 | 2020-06-16 | 深圳供电局有限公司 | Arc detection device and method |
| CN111398750A (en) * | 2020-03-30 | 2020-07-10 | 深圳供电局有限公司 | Arc identification method and system for arc identification |
| CN114567254A (en) * | 2022-04-28 | 2022-05-31 | 华中科技大学 | Direct current arc automatic detection and circuit breaking system under low current level |
-
2017
- 2017-01-09 CN CN201720021347.3U patent/CN206321731U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809255A (en) * | 2018-04-27 | 2018-11-13 | 国网安徽省电力有限公司六安供电公司 | A kind of photovoltaic generating system DC side arc fault method for comprehensive detection and system |
| CN111289852A (en) * | 2020-02-24 | 2020-06-16 | 深圳供电局有限公司 | Arc detection device and method |
| CN111289852B (en) * | 2020-02-24 | 2021-10-01 | 深圳供电局有限公司 | Arc detection device and method |
| CN111398750A (en) * | 2020-03-30 | 2020-07-10 | 深圳供电局有限公司 | Arc identification method and system for arc identification |
| CN111398750B (en) * | 2020-03-30 | 2021-09-28 | 深圳供电局有限公司 | Arc identification method and system for arc identification |
| CN114567254A (en) * | 2022-04-28 | 2022-05-31 | 华中科技大学 | Direct current arc automatic detection and circuit breaking system under low current level |
| CN114567254B (en) * | 2022-04-28 | 2022-07-19 | 华中科技大学 | Direct current arc automatic detection and circuit breaking system under low current level |
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Address after: Zhengtai Instrument Measurement Industrial Park, No.1 Liangce Road, Beibaixiang Town, Leqing City, Wenzhou City, Zhejiang Province, 325603 Patentee after: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. Country or region after: China Address before: 325603 Wenzhou Daqiao Industrial Park, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. Country or region before: China |
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