CN105259446A - Wide-spectrum rapid high-sensitivity fault arc detection sensor and protector - Google Patents
Wide-spectrum rapid high-sensitivity fault arc detection sensor and protector Download PDFInfo
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- CN105259446A CN105259446A CN201510740305.0A CN201510740305A CN105259446A CN 105259446 A CN105259446 A CN 105259446A CN 201510740305 A CN201510740305 A CN 201510740305A CN 105259446 A CN105259446 A CN 105259446A
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Abstract
The invention provides a wide-spectrum rapid high-sensitivity fault arc detection sensor and a fault arc protection circuit breaker. The sensor comprises a high-frequency magnetic field detection sensing module (002), a low-noise signal amplification unit (003), a core signal processing mathematic algorithm fault arc detection and processing unit (004), and a power transmission line (001). A variable wide-spectrum high-frequency current signal flowing through the power transmission line (001) is detected and then enters into a digital signal processing CPU after integral amplification and analog-digital conversion. After being processed through the technology of power spectrum analysis of random noise signals (white noises and colored noises), noise signal convolution, related technologies, noise signal detection technology, and an algorithm developed according to the characteristics of an actual fault arc signal, the signal is detected so as to judge whether there is a fault arc, thereby forming a detection sensor. The sensor is connected with a mechanical unhooking execution mechanism (012), thereby jointly forming the circuit breaker.
Description
Technical field
This project relates to the fault electric arc protection of the forceful electric power feed circuit of power domain and the input in telecommunications field and digital signal processing etc.
Background technology
Residual current operated protective device (RCD) effectively can reduce fire hazard by the leakage current detected in electric device and the arcing over the ground caused by electric trace galvanic current.But in fact RCD, fuse or miniature circuit breaker (MCB) can not to reduce by energized conductor between serial arc or the electrical fire that causes of parallel arc dangerous.When series arc faults occurs, owing to not producing earth leakage current, thus RCD cannot detect this kind of fault.And the fault impedance of serial arc reduces load current, make electric current lower than the trip threshold of MCB or fuse.When producing parallel arc between phase line and neutral conductor, electric current is only limited to the impedance of device.The most serious situation is accidental electric arc, and traditional isolating switch is not design for this purpose.Practical experience and existing message certification, the root-mean-square value of the earth-fault current of initiation fire can not be confined to the rated supply frequency of 50/60Hz, may comprise irrespective higher frequency spectrum when testing RCD.Therefore, be directed to above-mentioned situation, the present invention have devised a kind of can accurately detecting and comprises the serial arc of the wide spectrum from high frequency spectrum to low-frequency spectra and the detecting sensor of parallel arc and protector that small short time occurs.
Summary of the invention
Produce magnetic field around the live wire of curent change, when produce in circuit be no matter in parallel or serial arc time, the electric current in wire all can produce and change fast.This change promptly to react around magnetic field in.As long as therefore the rate of change in magnetic field accurately around detection zone electrical lead and magnetic field the relevant information of electric arc just can be obtained.Crucial problem is: 1, design and within the scope of wide spectrum, can detect that the high frequency magnetic field of fault electric arc signal detects sensing module with sensitivity.When 2, using electric loading different, current signal complexity very.Particularly when multiple load works simultaneously.Adopt the input of more complicated and Digital Signal Processing just can detect fault electric arc.This function is completed by core signal process mathematical algorithm fault electric arc detection and treatment unit.
Wide spectrum fast high-sensitive fault electric arc detecting sensor (000) as shown in Figure 1.In Fig. 1, (001) module is power transmission line, and fault electric arc detecting sensor is designed to a rectangular cubic, and cubical upper surface center opens a groove downwards, and power transmission line (001) is placed among groove.When the magnetic field of the electric current changed by changing in sensor (000) cube time power transmission line (001).Comprise power-supplying circuit (006) in sensor (000), high frequency magnetic field detects sensing module (002), noiselike signal amplifying unit (003), core signal process mathematical algorithm fault electric arc detection and treatment unit (004).Power-supplying circuit (006), from AC power power taking, exports DC low-voltage electricity for whole module after conversion.High frequency magnetic field detects the change that sensing module (002) detects magnetic field, the signal obtained is carried out Integral Processing, signal after integration is exported to noiselike signal amplifying unit (003) and carry out low noise amplification, guarantee that signal amplitude can meet A/D conversion below.Signal is carried out Analog-digital Converter by core signal process mathematical algorithm fault electric arc detection and treatment unit (004).Sample frequency tests the highest fault electric arc frequency spectrum the obtained twice value that is greater than according to reality is chosen, and in reality, choosing is not less than 2.5 times.After sample frequency sampling, signal carries out core signal process.This unit have employed digital signal processor DSP and (or) high-performance CPU(MCU) signal passes through complicated mathematical operation at this, thus Quick has taken out wide spectrum, faint fault electric arc signal.The algorithm that this module employs the signal detection technique in the power spectrumanalysis technology of random noise signal (comprising white noise and coloured noise), the convolution of noise signal, correlation technique, noise and develops according to the feature of physical fault arc signal.Core signal process mathematical algorithm fault electric arc detection and treatment unit (004) detects fault electric arc signal, exports fault electric arc indicator signal (005) by pin.
Wide spectrum fast high-sensitive fault electric arc protector is shown in Fig. 2.This protector employs wide spectrum fast high-sensitive fault electric arc detecting sensor.After sensor detects fault electric arc signal; by pin, fault electric arc indicator signal is exported to protection unhook topworks (012); this mechanism is the mechanical actuating mechanism driven by electric signal; after receiving the driving of fault electric arc indicator signal; mechanical mechanism performs tripping action; cut off the electricity supply, play safety protection function.
Fault electric arc detecting sensor is designed to a rectangular cubic, and cubical upper surface center opens a groove downwards, and power transmission line (001) is placed among groove, can be undertaken bonding by glue, also can directly be fixed by physical construction.This cube is the packing forms adopting thick film circuit, whole circuit package is become the integration module that closed.Thus the shock resistance of guarantee sensor, moisture resistance and reliability.High frequency magnetic field detects sensing module (002) and employs the pick-up unit of multiturn air core coil as magnetic field in practical implementations, and multiturn air core coil can be realized by two kinds of modes: the air core coil 1, using fine copper wire coiling.2, the air core coil by using the way of photoetching to make on a printed-wiring board.In order to ensure in very wide spectral range, fault electric arc signal is distortionless to be detected, and does not use ferrite to make the solid coil of core because being employed herein air core coil.A sample resistance on this coils connected in series, the signal voltage at sample resistance two ends is exported to the integrating circuit be made up of operational amplifier and resistance and electric capacity and is carried out integration, then exports.Signal exports to noiselike signal amplifying unit (003), and this unit employs two-level operating amplifier by the conversion amplitude needs of low level signal amplification to the enough analog digital converters of amplitude.The wide Hz-KHz of the equal demand fulfillment of operational amplifier, gain bandwidth product is enough high, and noise figure is enough low.Core signal process mathematical algorithm fault electric arc detection and treatment unit (004) mainly realizes analog-to-digital conversion and by performing mathematical calculations to signal, realizes the measuring ability of signal.This module adopts two kinds of ways to realize.1, the digital signal processor (DSP) of band A/D transducer is used.2, the powerful MCU of the cpu performance of band A/D transducer is used to complete.The realization of this module is mainly considered to choose the enough powerful processor of arithmetic capability (CPU).Software algorithm part mainly through carrying out the sampling of various signal under various loading condition, the sample of signal of fault electric arc in various situation of simultaneously sampling.When accumulating abundant working signal and fault-signal sample space, by using the technology such as signal detection technique in the power spectrumanalysis technology of random noise signal (comprising white noise and coloured noise), the convolution of noise signal, correlation technique, noise, develop suitable algorithm according to the feature of physical fault arc signal.In order to obtain enough sample of signal with characteristic feature, enough various Several Typical Loads be collected, and design realizes a fault electric arc analogue means to simulate generation fault electric arc.Wide spectrum fast high-sensitive fault electric arc protector is realized by following methods: the isolating switch designing a physical construction in the isolating switch casing of standard, this isolating switch is triggered by electric signal.Isolating switch receives trigger pip Hou Shi power supply mechanism and breaks off relations, and cuts off power supply.Hand-reset is only had to reclose power supply.
Claims (9)
1. wide spectrum fast high-sensitive fault electric arc detecting sensor and protector; it is characterized in that, comprise high frequency magnetic field and detect sensing module (002), noiselike signal amplifying unit (003); core signal process mathematical algorithm fault electric arc detection and treatment unit (004), power transmission line (001).
2. wide spectrum fast high-sensitive fault electric arc detecting sensor according to claim 1 and protector; it is characterized in that; employ the pick-up unit of multiturn air core coil as magnetic field in practical implementations, thus can ensure detect high frequency fault arc signal accurately and do not lose radio-frequency component.
3. wide spectrum fast high-sensitive fault electric arc detecting sensor according to claim 1 and protector, is characterized in that, multiturn air core coil is by using the way of photoetching to make on a printed-wiring board, and coil has been integrated on printed-wiring board (PWB).
4. wide spectrum fast high-sensitive fault electric arc detecting sensor according to claim 1 and protector, is characterized in that, the air core coil of multiturn air core coil or the coiling of use fine copper wire, does not use magnetic core.
5. wide spectrum fast high-sensitive fault electric arc detecting sensor according to claim 1 and protector, is characterized in that, signal voltage is exported to the integrating circuit be made up of operational amplifier and resistance and electric capacity and carried out integration, exports after integration.
6. wide spectrum fast high-sensitive fault electric arc detecting sensor according to claim 1 and protector; it is characterized in that; noiselike signal amplifying unit (003) employs operational amplifier by the conversion amplitude needs of low level signal amplification to the enough analog-to-digital converters of amplitude; the wide Hz-KHz of the equal demand fulfillment of operational amplifier; gain bandwidth product is enough high, and noise figure is enough low.
7. wide spectrum fast high-sensitive fault electric arc detecting sensor according to claim 1 and protector; it is characterized in that core signal process mathematical algorithm fault electric arc detection and treatment unit (004) mainly realizes analog/digital conversion and by performing mathematical calculations to signal; realize the measuring ability of signal, by using the digital signal processor (DSP) of band A/D transducer or using the powerful MCU of the cpu performance of band A/D transducer to complete.
8. wide spectrum fast high-sensitive fault electric arc detecting sensor according to claim 1 and protector; it is characterized in that the technology such as the signal detection technique in the convolution of the power spectrumanalysis technology by using random noise signal (comprising white noise and coloured noise), noise signal, correlation technique, noise, developing suitable algorithm according to the feature of physical fault arc signal.
9. wide spectrum fast high-sensitive fault electric arc detecting sensor according to claim 1 and protector; it is characterized in that topworks is the isolating switch of a physical construction; this isolating switch is triggered by electric signal; isolating switch receives trigger pip Hou Shi power supply mechanism and breaks off relations; cut off power supply, only have hand-reset to reclose power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510740305.0A CN105259446A (en) | 2015-11-04 | 2015-11-04 | Wide-spectrum rapid high-sensitivity fault arc detection sensor and protector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510740305.0A CN105259446A (en) | 2015-11-04 | 2015-11-04 | Wide-spectrum rapid high-sensitivity fault arc detection sensor and protector |
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| CN105259446A true CN105259446A (en) | 2016-01-20 |
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| CN201510740305.0A Pending CN105259446A (en) | 2015-11-04 | 2015-11-04 | Wide-spectrum rapid high-sensitivity fault arc detection sensor and protector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106683318A (en) * | 2017-03-21 | 2017-05-17 | 北京腾锐视讯科技有限公司 | Fault arc fire alarm detector |
| CN106950476A (en) * | 2017-03-31 | 2017-07-14 | 北京腾锐视讯科技有限公司 | A kind of fault electric arc detection sensor of some face installation parallel with detected wire |
| CN108535606A (en) * | 2017-03-06 | 2018-09-14 | 孙麓轩 | Fault arc detection method and device |
| CN113064034A (en) * | 2020-03-30 | 2021-07-02 | 深圳友讯达科技股份有限公司 | Intelligent meter box safety protection monitoring device |
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| CN104104055A (en) * | 2014-06-16 | 2014-10-15 | 温州市万盛电器有限公司 | Electric leakage detection protection circuit with timed self-checking and reverse wiring protection functions |
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2015
- 2015-11-04 CN CN201510740305.0A patent/CN105259446A/en active Pending
Patent Citations (7)
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| US20040263183A1 (en) * | 2003-04-24 | 2004-12-30 | Malakondaiah Naidu | Arc fault detector and method |
| CN2651991Y (en) * | 2003-07-17 | 2004-10-27 | 黄华道 | Socket with electric arc and leakage protective function |
| CN1808664A (en) * | 2005-12-21 | 2006-07-26 | 广东珠江开关有限公司 | Intelligent fire-proof switch |
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| CN104104055A (en) * | 2014-06-16 | 2014-10-15 | 温州市万盛电器有限公司 | Electric leakage detection protection circuit with timed self-checking and reverse wiring protection functions |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535606A (en) * | 2017-03-06 | 2018-09-14 | 孙麓轩 | Fault arc detection method and device |
| CN108535606B (en) * | 2017-03-06 | 2023-10-13 | 孙麓轩 | Fault arc detection method and device |
| CN106683318A (en) * | 2017-03-21 | 2017-05-17 | 北京腾锐视讯科技有限公司 | Fault arc fire alarm detector |
| CN106950476A (en) * | 2017-03-31 | 2017-07-14 | 北京腾锐视讯科技有限公司 | A kind of fault electric arc detection sensor of some face installation parallel with detected wire |
| CN113064034A (en) * | 2020-03-30 | 2021-07-02 | 深圳友讯达科技股份有限公司 | Intelligent meter box safety protection monitoring device |
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