CN103278734A - Arc fault detection device and detection method thereof - Google Patents
Arc fault detection device and detection method thereof Download PDFInfo
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Abstract
The invention relates to an arc fault detection device which comprises a power module, a signal acquisition processing unit, a central processing arithmetic unit and a control output unit capable of controlling power connection and disconnection of a load. The central processing arithmetic unit identifies arcs through a load arc feature library, a load arc type analysis module and a load arc judgment module, and outputs a control signal to the control output unit to control the connection and disconnection of a load circuit. By means of the arc fault detection device, the problems that an arc detection device in the prior art cannot distinguish load characteristics in a loop and cannot sufficiently identify the arcs in the loop are effectively avoided. The arc fault detection device and a detection method of the arc fault detection device can be adjusted automatically according to the characteristics of the arcs and can sufficiently identify the arcs.
Description
Technical field
The present invention relates to a kind of arc fault sniffer, belong to the circuit protection technical field.
Background technology
Electric arc is that electric current passes through the moment spark that insulating medium produces.In atmosphere, cut-off or sealing voltage surpasses 10V, when electric current surpasses the circuit of 100MA, can produce electric arc in the contact gap of electrical equipment.When electric arc takes place, can in the extremely short time, discharge huge energy.Metallic conductive element can be vaporized and be caused high-temperature steam and metal sharply to expand.Air and the rapid thermal expansion of metal vaporizer meeting cause the blast of the huge sound and huge pressure.And electric arc produces the back temperature and raises suddenly, can make between arc gap gas take place heat from, aggravated the ionization of air molecule conversely again, electric arc is burnt away, thereby has strengthened the difficulty of extinguish arcs.Because very high, the long-time continuity of Arc Temperature, the combustible around very easily igniting forms fire, but the short-circuit current that is caused by electric arc is less, and not enough so that general isolating switch would trip is cut off the electricity supply.Fault electric arc has become the one of the main reasons that causes electrical fire, serious harm the safety of popular lives and properties.So fault electric arc is studied especially, and fault arc detection method research seems particularly important.
By above-mentioned analysis as can be known, the generation of electric arc may make contact burn out and can cause short circuit when serious even security incident takes place, therefore must adopt an effective measure and in time detect the circuit of leakage, could normally work to guarantee device for switching rapidly with arc extinction.China utility model patent CN202230166U discloses a kind of fault electric arc detection module and detector for electric fire protection, for realizing because of the empty weak point of circuit, empty disconnected and fault electric arc that produce effectively detects and early warning, it gathers arc signal by the high-frequency signal sampling unit, and signal is transferred to signal processing unit handles, at last the arc signal of handling well is transferred to the fault electric arc analytic unit, the fault electric arc analytic unit is collected arc signal, and the information of gathering power supply collecting unit at zero point, distinguished arc, bad arc is that bad arc will send alerting signal to the upper end CPU (central processing unit) if detect.Gather arc signal in this technical scheme by the high frequency sampling unit, by with the contrast of the sample information of power supply collecting unit at zero point, analyze whether the electric arc leakage has taken place, but because the type of load is more, as capacitive load, resistive load etc., the load difference can cause the feature difference of electric arc, with its all with the sample information at described power supply zero point relatively, there is certain deviation in judgement to electric arc, therefore there is deviation in detected electric arc in this loop, can not fully identify the electric arc that the loop takes place, so just cause the security of this circuit to reduce, improve risk.
Summary of the invention
Technical matters to be solved by this invention is that electric arc detecting device of the prior art can't be distinguished the load characteristic in the loop, can not fully identify the problem of the electric arc in the loop, thereby a kind of arc fault sniffer and the detection method thereof that can adjust, fully identify electric arc according to the characteristic of electric arc automatically is provided.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of arc fault sniffer comprises:
Power module: for described arc fault sniffer provides power supply;
Signal acquisition process unit: the sample circuit that the residual current of comprise the current transformer that is arranged in the circuit under test, described current transformer being sensed and excess current are carried out sampling processing and the amplifying circuit that sampled signal is amplified processing;
Central authorities handle arithmetic element, are connected with described signal acquisition process unit, and the output signal of described signal acquisition process unit is carried out calculation process,
The control output unit is handled arithmetic element with described central authorities and is connected, and handles the signal sending controling instruction of arithmetic element and carries out make-break operation according to described central authorities;
Described central authorities handle arithmetic element and comprise:
Load arc characteristic storehouse: the type that stores load electric arc with and corresponding load arc characteristic curve and threshold value;
Load electric arc type analysis module: the output signal to described signal acquisition process unit is carried out signature analysis, obtain load arc characteristic parameter, and the load arc characteristic curve in itself and the described load telephony feature storehouse compared, obtain the type of load electric arc;
Load electric arc judge module: according to the type of described load electric arc, current output valve and the described threshold value of described signal acquisition process unit compared, when surpassing threshold value to described control output unit output action signal.
Described central authorities handle arithmetic element and adopt single-chip microcomputer.
Described sample circuit comprises sampling resistor, electric capacity and the clamp diode that is arranged in parallel;
Described amplifying circuit comprises one-level amplifying circuit and secondary amplification filtering circuit, second resistance that described one-level amplifying circuit comprises first amplifier, is connected first resistance between the described first amplifier input cathode and the output terminal and is connected the described first amplifier input cathode; Described secondary amplification filtering circuit comprises second amplifier, be connected input cathode and the 3rd resistance between the output terminal of described second amplifier, be connected the 4th resistance and the filter capacitor of the input cathode of described second amplifier, described the 4th resistance is connected with described second resistance, one end of filter capacitor is connected the output terminal of described second amplifier, and the other end is connected the link of described second resistance and the 4th resistance.
Described control output unit comprises tripping controller and relay, and described tripping controller is connected with described relay, and described single-chip microcomputer output signal drives tripping controller and drives the described actuating of relay, changes the on off operating mode of circuit.
Described power module comprises AC/DC change-over circuit and DC/DC change-over circuit.
Comprise the communication processing unit with anti-surge circuit and photoelectric isolating circuit, described communication processing unit is connected, adopts two bus communication modes and host computer to carry out communication with described single-chip microcomputer.
Also comprise the man-machine conversation unit, described man-machine conversation unit is connected with described single-chip microcomputer; Described man-machine conversation unit comprises LCD and/or keyboard and/or hummer and/or pilot lamp.
A kind of arc fault detection method comprises the steps:
(1) is each unit power supply by power module;
(2) by current transformer the residual current in the circuit and excess current are detected, then detected value is carried out signal sampling through over-sampling circuit, then the signal after the sampling is amplified processing, and be transferred to central authorities' processing arithmetic element;
(3) the described central arithmetic element of handling is carried out signature analysis to the output signal of described signal acquisition process unit, obtain load arc characteristic parameter, and the load arc characteristic curve in itself and the described load telephony feature storehouse compared, obtain the type of load electric arc, type according to described load electric arc, current output valve and the described threshold value of described signal acquisition process unit are compared, when surpassing threshold value to described control output unit output action signal;
(4) handle the signal sending controling instruction of arithmetic element and carry out make-break operation according to described central authorities.
In the described step (3), characteristic analysis method is Fourier algorithm, and described load arc characteristic parameter comprises phasing degree and current spectrum; Described loadtype comprises resistive load, inductive load, capacitive load.
Also comprise the step that communication processing unit transmits the electric arc information that detects and operating state after the described step (4).
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) arc fault sniffer of the present invention comprises that control output unit, signal acquisition process unit and the central authorities of energy control load power on/off handle arithmetic element.Residual current and excess current in the described signal acquisition process unit sampling loaded line are imported signal described single-chip microcomputer after treatment; Described single-chip microcomputer is judged the information that receives and is analyzed, send control signal at different testing results to described control output unit then, change the power on/off state of described control output unit, and then the break-make of the loaded line that is connected with described control output unit of change, realize that the arc fault sniffer is in time surveyed and the blocking-up loaded line in the function of electric arc.Described central authorities handle the single-chip microcomputer that adopts in the arithmetic element, after receiving the electric arc sampled signal of testing circuit, described single-chip microcomputer can be at first according to the relation of electric current and voltage at that time, specificity analysis is carried out in utilization efficiently and accurately Fourier algorithm, obtain parameters such as the phasing degree state of load and current spectrum, thereby judge the type of electric arc.Described single-chip microcomputer is distinguished according to arc characteristic the judgement of the type of fault electric arc.In order to judge the electric arc type that has the various loads of different phase differential features as resistive load, inductive load, capacitive load etc., can store the arc characteristic of most loads in the described single-chip microcomputer, and adopt the self study mode, in running status the electric arc that produces is carried out real-time renewal.The arc characteristic of the load of various characteristics draws via a large amount of experiments and analysis.Effectively avoided electric arc detecting device in the prior art can't distinguish load characteristic in the loop, can not fully identify the problem of the electric arc in the loop, thereby a kind of arc fault sniffer and the detection method thereof that can adjust, fully identify electric arc according to the characteristic of electric arc automatically is provided.
(2) in the arc fault sniffer of the present invention, described control output unit comprises tripping controller and relay.Described and described relay is connected, and described single-chip microcomputer output signal drives tripping controller and controls the described actuating of relay, thereby changes the on off operating mode of circuit.When producing electric arc in the described single-chip microcomputer decision circuitry, import one into can for described relay and reach regulation requirement semaphore, described relay is because of this action change state of meeting, and then makes the described tripping controller that links to each other with it follow the change state, and action disconnects the loaded line of connection.Described switching mode relay can go to control big electric current running with little electric current, and described tripping controller can the auto-action disconnecting circuit after connecting.So described tripping controller is connected cooperation with described relay, just can realize the purpose of automatic switching circuit making the device circuit easy, easy operating via described Single-chip Controlling.
(3) arc fault sniffer of the present invention; described signal acquisition process unit comprises current transformer that electric current is sampled, prevents the overtension of sampled signal or low excessively holding circuit and filter amplification circuit; residual current and excess current in the described current transformer sampling loaded line proportionally are transformed into the described holding circuit of input behind the direct current with it.If the overtension of sampled signal or low excessively, described holding circuit can be drawn unnecessary electric current the circuit of described arc fault sniffer, thereby protects the core circuit of described device.In the input subsequent conditioning circuit that the sampled signal of handling by described current transformer and described holding circuit can be safer, reduce the device loss of described arc fault sniffer greatly.
(4) arc fault sniffer of the present invention, described filter amplification circuit comprises operational amplification circuit and amplification filtering circuit.Safety signal after described holding circuit will be handled is imported described operational amplification circuit and is carried out the amplification of signal one-level, sends into described amplification filtering circuit after signal amplifies and carries out the second signal processing; Signal can send arc signal more accurately to central authorities' processing arithmetic element and carry out judgment processing after the filter amplifying processing of two-stage amplifying circuit.
(8) arc fault sniffer of the present invention, described power module comprises AC/DC change-over circuit and DC/DC change-over circuit, described AC/DC change-over circuit is connected with described DC/DC change-over circuit.Described AC/DC change-over circuit converts alternating current the rated direct voltage of described signal acquisition process unit and described man-machine conversation element circuit to, and described DC/DC change-over circuit converts this DC voltage to rated direct voltage that described central authorities handle arithmetic element and described communication processing unit.Described power module can be finished change in voltage twice, can directly satisfy the different voltage requests of each circuit in the described arc fault sniffer.
(5) arc fault sniffer of the present invention comprises the communication processing unit with anti-surge circuit and photoelectric isolating circuit.Described communication processing unit is connected, adopts two bus communication modes and host computer to carry out communication with described single-chip microcomputer.Described communication processing unit has the superpower advantage of anti-electromagnetic interference capability, makes described arc fault sniffer when the communication by described self-defining two bus communication modes and host computer, compares by common RS485, CAN bus communication more stable.
(6) arc fault sniffer of the present invention, described communication processing unit comprises receiving processing circuit and signal sending circuit, described receiving processing circuit and described signal sending circuit have anti-surge and photoelectricity insulation blocking.Host computer sends the serial digital level controling signal to communication processing unit by two communication buses, this level controling signal is controlled described arc fault sniffer as control signal after sending into described CPU (central processing unit) analyzing and processing through described receiving processing circuit.The data-signal that described CPU (central processing unit) sends is handled the back with serial digital current system and upper machine communication by described signal sending circuit.If described arc fault sniffer detects electric arc, described signal sending circuit can be sent to data in real time such as arc signals as host computers such as electric fire disaster monitoring equipment by self-defining two bus communication modes; When fault electric arc took place, described arc fault sniffer can play the effect of timely warning like this.
(7) arc fault sniffer of the present invention comprises the man-machine conversation unit, and described man-machine conversation unit is connected with described single-chip microcomputer.Described man-machine conversation unit comprises liquid crystal and/or keyboard and/or hummer and/or pilot lamp.Described man-machine conversation unit can make the user check fault electric arc sniffer running status clear and intuitively and carry out the parameter setting, can realize monitoring in real time controlled loop arc fault operational factor.Keyboard is set finishes interactive input function well.LED light indication fault arc detection device running status is set.Hummer prompting fault electric arc sniffer alarm condition is set.When reporting to the police, the fault electric arc sniffer sends the fire alarm acoustical signal and reminds the staff in time to solve processing, and this signal can manually be eliminated, when the alerting signal input is arranged again, the fire alarm acoustical signal can start again, and gives maintenance, resets until the fault electric arc sniffer.
Description of drawings
Content of the present invention is easier clearly to be understood in order to make, and below in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein,
Fig. 1 is arc fault sniffer structural representation of the present invention;
Fig. 2,3,4, the 5th, the circuit diagram of arc fault sniffer of the present invention.
Embodiment
Embodiment 1:
The invention provides a kind of arc fault sniffer, as shown in Figure 1, comprising:
(1) power module: for described arc fault sniffer provides power supply, described power module comprises AC/DC change-over circuit and DC/DC change-over circuit, and described AC/DC change-over circuit is connected with described DC/DC change-over circuit.
(2) signal acquisition process unit: the sample circuit that the residual current of comprise the current transformer that is arranged in the circuit under test, described current transformer being sensed and excess current are carried out sampling processing and the amplifying circuit that sampled signal is amplified processing.Described sample circuit comprises sampling resistor, electric capacity and the clamp diode that is arranged in parallel.Described amplifying circuit comprises one-level amplifying circuit and secondary amplification filtering circuit, second resistance that described one-level amplifying circuit comprises first amplifier, is connected first resistance between the described first amplifier input cathode and the output terminal and is connected the described first amplifier input cathode; Described secondary amplification filtering circuit comprises second amplifier, be connected input cathode and the 3rd resistance between the output terminal of described second amplifier, be connected the 4th resistance and the filter capacitor of the input cathode of described second amplifier, described the 4th resistance is connected with described second resistance, one end of filter capacitor is connected the output terminal of described second amplifier, and the other end is connected the link of described second resistance and the 4th resistance.
(3) central authorities handle arithmetic element, are connected with described signal acquisition process unit, and the output signal of described signal acquisition process unit is carried out calculation process, and described central authorities handle arithmetic element and adopt single-chip microcomputer, comprising:
(3.1) load arc characteristic storehouse: the type that stores load electric arc with and corresponding load arc characteristic curve and threshold value, described loadtype comprises resistive load, inductive load, capacitive load.
(3.2) load electric arc type analysis module: the output signal to described signal acquisition process unit is carried out signature analysis, described characteristic analysis method is Fourier algorithm, obtain load arc characteristic parameter, described load arc characteristic parameter comprises phasing degree and current spectrum, and the load arc characteristic curve in itself and the described load telephony feature storehouse compared, obtain the type of load electric arc;
(3.3) load electric arc judge module: according to the type of described load electric arc, current output valve and the described threshold value of described signal acquisition process unit compared, when surpassing threshold value to described control output unit output action signal.
(4) control output unit is handled arithmetic element with described central authorities and is connected, and handles the signal of arithmetic element according to described central authorities and carries out make-break operation; Described control output unit comprises and relay that described tripping controller is connected with described relay, and described single-chip microcomputer output signal drives described tripping controller pilot relay action, thereby changes the on off operating mode of loaded line.
In addition, said apparatus also comprises the communication processing unit with anti-surge circuit and photoelectric isolating circuit, and described communication processing unit is connected, adopts two bus communication modes and host computer to carry out communication with described single-chip microcomputer; Described communication processing unit comprises receiving processing circuit and signal sending circuit, host computer is sent into described CPU (central processing unit) by the control that two buses send by described receiving processing circuit, and the data-signal that described CPU (central processing unit) sends is handled with serial digital current system and upper machine communication through described signal sending circuit.In addition, described device comprises the man-machine conversation unit, and described man-machine conversation unit is connected with described single-chip microcomputer; Described man-machine conversation unit comprises LCD and/or keyboard and/or hummer and/or pilot lamp.
The arc fault detection method of the described arc fault sniffer of present embodiment correspondence comprises the steps:
(1) by power module for the power supply of each unit, provide each unit required voltage by AC/DC change-over circuit and DC/DC change-over circuit;
(2) by current transformer the residual current in the circuit and excess current are detected, then detected value is carried out signal sampling through over-sampling circuit, then the signal after the sampling is amplified processing, and be transferred to central authorities' processing arithmetic element;
(3) the described central arithmetic element of handling is carried out signature analysis to the output signal of described signal acquisition process unit, described characteristic analysis method is Fourier algorithm, obtain load arc characteristic parameter then, described load arc characteristic parameter comprises phasing degree and current spectrum.And the load arc characteristic curve in itself and the described load telephony feature storehouse compared, obtaining the type of load electric arc, described loadtype comprises resistive load, inductive load, capacitive load.According to the type of described load electric arc, current output valve and the described threshold value of described signal acquisition process unit compared, when surpassing threshold value to described control output unit output action signal;
(4) handle the signal sending controling instruction of arithmetic element and carry out make-break operation according to described central authorities.
Embodiment 2:
The described arc fault sniffer of present embodiment, circuit diagram such as Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, power module is the AC/DC change-over circuit, adopt the ACDC1 power supply changeover device to convert AC220V to the DC5V power supply and be used for the electricity consumption of sniffer signal acquisition process, man-machine conversation unit, adopt the integrated LDO power module of UV3 to convert the DC5V power supply to the DC3.3V power supply and be used for central arithmetic element, the communication unit handled.The signal acquisition process unit module is that high magnetic conducting nanocrystalline current transformer sample respectively residual current and the excess current of loaded line are selected in sampling for use, mutual inductor with sensor current signal by sampling resistor RS1, capacitor C S1, clamp diode DS1 processing of circuit.Signal is sent into the operational amplification circuit that is made of amplifier US1, resistance R S4, resistance R S6 and is carried out the signal one-level and amplify after the sampling processing, send into after signal amplifies and constitute the amplification filtering circuit by amplifier US2, resistance R S7, capacitor C S2 and carry out second signal and handle, send into central authorities at last and handle arithmetic element 24HJ64GP506 single-chip microcomputer and carry out Fourier and resolve calculation process.Central authorities handle and to adopt the PIC24HJ64GP506 single-chip microcomputer in the arithmetic element module, and it is 16bit high-performance single-chip microcomputer, and 40M has 53 programmable Is/O mouth, 12 hyperchannel autoscan A/D converters, Program Flash Memory64KB, SRAMsize8K.
The information that single-chip microcomputer will detect and receive is judged, is analyzed and handles, and realizes real time fail electric arc information and early warning, warning, control information demonstration and the sound and light of alarm of electrical fire detector.After single-chip microcomputer receives the electric arc of testing circuit, output signal to described signal acquisition process unit is carried out signature analysis, obtain load arc characteristic parameter, and the load arc characteristic curve in itself and the described load telephony feature storehouse compared, obtain the type of load electric arc, then according to the type of described load electric arc, current output valve and the described threshold value of described signal acquisition process unit compared, when surpassing threshold value to described control output unit output action signal.At this, single-chip microcomputer is at first according to the relation of electric current at that time and voltage, uses efficiently and accurately Fourier algorithm to carry out specificity analysis, obtains parameters such as the phasing degree state of load and current spectrum, thereby judges the type of electric arc.The judgement of the type of fault electric arc is to distinguish according to arc characteristic.In order to satisfy the load of various characteristics, as resistive load, inductive load, capacitive load, they have different phase differential features, need a large amount of experiment basis to draw the load arc characteristic, load arc characteristic to the overwhelming majority is analyzed, and it is stored in the single-chip microcomputer.So just set up load arc characteristic storehouse, the type that wherein stores load electric arc with and corresponding load arc characteristic curve and threshold value.By adopting the self study mode, in running status the electric arc that produces is carried out real-time renewal like this.In the man-machine conversation unit, the user checks fault electric arc sniffer running status clear and intuitively and carries out the parameter setting that system is provided with the complete Chinese LCD of LCD, can realize monitoring in real time controlled loop arc fault operational factor for convenience.Keyboard is set finishes interactive input function well.LED light indication fault arc detection device running status is set.Hummer prompting fault electric arc sniffer alarm condition is set.
When reporting to the police, the fault electric arc sniffer sends the fire alarm acoustical signal and reminds the staff in time to solve processing, and this signal can manually be eliminated, when the alerting signal input is arranged again, the fire alarm acoustical signal can start again, and gives maintenance, resets until the fault electric arc sniffer.When sampling fault electric arc information surpassed the value of setting, sniffer output alarm protection output, dropout output signal drove the actuating of relay.Switching mode relay, contact capacity 250V AC/5A are adopted in control output.In the communication processing unit module, the arc fault sniffer is sent to electric fire disaster monitoring equipment by self-defining two bus communication modes with data in real time such as arc signals.As found fault electric arc, can in time report to the police.Host computer sends serial digital level 0V by communication bus L1, L2 or the 24V control signal arrives sniffer, control signal through the receiving processing circuit of being formed by resistance, electric capacity, diode, stabilivolt, triode, optocoupler UP1, UP2 after, control sniffer after sending into the CPU (central processing unit) analyzing and processing again.
The CPU (central processing unit) of sniffer sends data-signal and handles by the signal sending circuit that resistance R P1, RP2, RP3, RP4 and optocoupler UP1, UP2 constitute, with serial digital current system and upper machine communication.Communication processing unit adopts the anti-surge protection of the two-way surge diode of TVS1; the photoelectric isolating circuit that optocoupler UP1, UP2, UP3, UP4 constitute; these self-defining two bus communication modes make that sniffer is compared common RS485 with host communication, the CAN bus communication is more stable, the advantage that anti-electromagnetic interference capability is superpower.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.And the apparent variation of being extended out thus or change still are among the protection domain of the invention.
Claims (10)
1. arc fault sniffer comprises:
Power module: for described arc fault sniffer provides power supply;
Signal acquisition process unit: the sample circuit that the residual current of comprise the current transformer that is arranged in the circuit under test, described current transformer being sensed and excess current are carried out sampling processing and the amplifying circuit that sampled signal is amplified processing;
Central authorities handle arithmetic element, are connected with described signal acquisition process unit, and the output signal of described signal acquisition process unit is carried out calculation process,
The control output unit is handled arithmetic element with described central authorities and is connected, and handles the signal sending controling instruction of arithmetic element and carries out make-break operation according to described central authorities;
It is characterized in that,
Described central authorities handle arithmetic element and comprise:
Load arc characteristic storehouse: the type that stores load electric arc with and corresponding load arc characteristic curve and threshold value;
Load electric arc type analysis module: the output signal to described signal acquisition process unit is carried out signature analysis, obtain load arc characteristic parameter, and the load arc characteristic curve in itself and the described load telephony feature storehouse compared, obtain the type of load electric arc;
Load electric arc judge module: according to the type of described load electric arc, current output valve and the described threshold value of described signal acquisition process unit compared, when surpassing threshold value to described control output unit output action signal.
2. arc fault sniffer according to claim 1 is characterized in that, described central authorities handle arithmetic element and adopt single-chip microcomputer.
3. arc fault sniffer according to claim 1 and 2 is characterized in that described sample circuit comprises sampling resistor, electric capacity and the clamp diode that is arranged in parallel;
Described amplifying circuit comprises one-level amplifying circuit and secondary amplification filtering circuit, second resistance that described one-level amplifying circuit comprises first amplifier, is connected first resistance between the described first amplifier input cathode and the output terminal and is connected the described first amplifier input cathode; Described secondary amplification filtering circuit comprises second amplifier, be connected input cathode and the 3rd resistance between the output terminal of described second amplifier, be connected the 4th resistance and the filter capacitor of the input cathode of described second amplifier, described the 4th resistance is connected with described second resistance, one end of filter capacitor is connected the output terminal of described second amplifier, and the other end is connected the link of described second resistance and the 4th resistance.
4. according to each described arc fault sniffer among the claim 1-3, it is characterized in that, described control output unit comprises tripping controller and relay, described tripping controller is connected with described relay, described single-chip microcomputer output signal drives tripping controller and drives the described actuating of relay, changes the on off operating mode of circuit.
5. according to each described arc fault sniffer among the claim 1-4, it is characterized in that described power module comprises AC/DC change-over circuit and DC/DC change-over circuit.
6. according to each described arc fault sniffer among the claim 1-5, it is characterized in that, comprise the communication processing unit with anti-surge circuit and photoelectric isolating circuit, described communication processing unit is connected, adopts two bus communication modes and host computer to carry out communication with described single-chip microcomputer.
7. according to each described arc fault sniffer among the claim 1-6, it is characterized in that also comprise the man-machine conversation unit, described man-machine conversation unit is connected with described single-chip microcomputer; Described man-machine conversation unit comprises LCD and/or keyboard and/or hummer and/or pilot lamp.
8. an arc fault detection method is characterized in that, comprises the steps:
(1) is each unit power supply by power module;
(2) by current transformer the residual current in the circuit and excess current are detected, then detected value is carried out signal sampling through over-sampling circuit, then the signal after the sampling is amplified processing, and be transferred to central authorities' processing arithmetic element;
(3) the described central arithmetic element of handling is carried out signature analysis to the output signal of described signal acquisition process unit, obtain load arc characteristic parameter, and the load arc characteristic curve in itself and the described load telephony feature storehouse compared, obtain the type of load electric arc, type according to described load electric arc, current output valve and the described threshold value of described signal acquisition process unit are compared, when surpassing threshold value to described control output unit output action signal;
(4) handle the signal sending controling instruction of arithmetic element and carry out make-break operation according to described central authorities.
9. arc fault detection method according to claim 8 is characterized in that, in the described step (3), characteristic analysis method is Fourier algorithm, and described load arc characteristic parameter comprises phasing degree and current spectrum; Described loadtype comprises resistive load, inductive load, capacitive load.
10. according to Claim 8 or 9 described arc fault detection methods, it is characterized in that, also comprise the step that communication processing unit transmits the electric arc information that detects and operating state after the described step (4).
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| CN109946507A (en) * | 2019-02-22 | 2019-06-28 | 苏州埃缇益自动化科技有限公司 | A kind of supply voltage real-time monitoring system of semiconductor test machine |
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| CN111426921A (en) * | 2020-04-17 | 2020-07-17 | 珠海泰特微电子股份有限公司 | Arc detection circuit and detection method thereof |
| CN112309075A (en) * | 2020-10-20 | 2021-02-02 | 东南大学 | Fire early warning system of photovoltaic power station |
| CN113311361A (en) * | 2021-06-05 | 2021-08-27 | 温州理工学院 | Multi-functional wisdom power consumption monitor terminal |
| CN114252669A (en) * | 2021-12-22 | 2022-03-29 | 江苏格澜得智能电气有限公司 | Device for generating series arc harmonic signals |
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| CN104215826A (en) * | 2014-06-05 | 2014-12-17 | 张天福 | Faulted arc type electrical fire monitoring detector and faulted arc recognition and alarm method |
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| CN105259497A (en) * | 2015-10-28 | 2016-01-20 | 万高(杭州)科技有限公司 | Circuit breaker arc fault circuit breaker system and method |
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| CN107356841A (en) * | 2017-08-19 | 2017-11-17 | 浙江安美科技有限公司 | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device |
| CN108963962A (en) * | 2018-08-10 | 2018-12-07 | 中航建设集团成套装备股份有限公司 | A kind of multi-layer arc fault open-circuit system |
| CN109061422A (en) * | 2018-09-14 | 2018-12-21 | 江苏斯菲尔电气股份有限公司 | Electric instrument with fault electric arc detecting function |
| CN109342904A (en) * | 2018-12-04 | 2019-02-15 | 珠海格力电器股份有限公司 | A kind of method and device of arc fault detection and early warning |
| CN109342904B (en) * | 2018-12-04 | 2020-05-19 | 珠海格力电器股份有限公司 | Arc fault detection and early warning method |
| CN109946535A (en) * | 2018-12-28 | 2019-06-28 | 上海汇鸿智能控制***股份有限公司 | A kind of fault arc detection method |
| CN109709427A (en) * | 2018-12-30 | 2019-05-03 | 常州九圣焊割设备有限公司 | Attrition component fault detection method in plasma arc torch |
| CN109709427B (en) * | 2018-12-30 | 2021-09-03 | 常州九圣焊割设备股份有限公司 | Method for detecting faults of consumable parts in plasma arc spray gun |
| CN109946507A (en) * | 2019-02-22 | 2019-06-28 | 苏州埃缇益自动化科技有限公司 | A kind of supply voltage real-time monitoring system of semiconductor test machine |
| CN110118900A (en) * | 2019-03-27 | 2019-08-13 | 南京航空航天大学 | A kind of remained capacity and power frequency series arc faults detection method |
| CN111030302A (en) * | 2019-12-20 | 2020-04-17 | 吉林省龙电电气有限公司 | Intelligent electricity safety detector |
| CN111426921A (en) * | 2020-04-17 | 2020-07-17 | 珠海泰特微电子股份有限公司 | Arc detection circuit and detection method thereof |
| CN111426921B (en) * | 2020-04-17 | 2022-09-02 | 珠海泰特微电子股份有限公司 | Arc detection circuit and detection method thereof |
| CN112309075A (en) * | 2020-10-20 | 2021-02-02 | 东南大学 | Fire early warning system of photovoltaic power station |
| CN113311361A (en) * | 2021-06-05 | 2021-08-27 | 温州理工学院 | Multi-functional wisdom power consumption monitor terminal |
| CN114252669A (en) * | 2021-12-22 | 2022-03-29 | 江苏格澜得智能电气有限公司 | Device for generating series arc harmonic signals |
| CN114252669B (en) * | 2021-12-22 | 2024-04-26 | 江苏格澜得智能电气有限公司 | Device for generating series arc harmonic signals |
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