CN102375107A - Method and device for detecting fault electric arc based on time-frequency comprehensive analysis - Google Patents
Method and device for detecting fault electric arc based on time-frequency comprehensive analysis Download PDFInfo
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Abstract
The invention relates to a method and device for detecting fault electric arc based on time-frequency comprehensive analysis. The method comprises the following steps of: (1) resetting power-on; (2) initializing a system; (3) initializing parameters, and assigning values for the parameter; (4) opening timed disconnection and starting A/D (Analog to Digital) conversion; and (5) acquiring output voltage signals and the like of a signal conditioning circuit and an amplitude detecting circuit in real time with a microprocessor by taking Tsample time as a sampling interval. The device comprises a current mutual inductor, a voltage following circuit, an amplitude detecting circuit, a power supply module, a signal conditioning circuit, a microprocessor, a tripping driving circuit, a tripping action mechanism, a resetting circuit, a testing circuit and an LED (Light-Emitting Circuit) indicating circuit. Compared with the prior art, the method and device have the advantages of low computing complexity, high security, low cost and the like.
Description
Technical field
The present invention relates to a kind of distribution line failure arc protection field, especially relate to a kind of fault arc detection method and device thereof based on the time-frequency analysis-by-synthesis.
Background technology
The circuit of premises and equipment; Such as electric wiring, socket circuit, household electrical appliance internal wiring or power lead etc.; Owing to long-time run with load, transship or influenced by external force can to cause electric wire insulation layer to occur aging or damage in insulation takes place, cause SP arc fault or line-to-ground short circuit fault between circuit easily.Compare with short trouble, electric current was less when fault electric arc took place, and was that the conventional line protective device of representative can not be made accurate judgement to fault electric arc with residual current protecting isolating switch, fuse.Can produce localized hyperthermia during arc burning, become the one of the main reasons that causes electrical fire, serious threat personnel's the security of the lives and property.
(Arc Fault Circuit Interrupter is the circuit protection device that a kind of latest developments are got up AFCI) to the fault electric arc isolating switch, and when having fault electric arc to take place, it should be able to cut off circuit rapidly.The scope of application of present most of AFCI products is less, is primarily aimed at some certain loads, does not have good distinguishing ability for the load that similar arc characteristic is arranged.
Exchange the fault electric arc current waveform and on time domain, have following characteristic: 1, because fault electric arc is similar to resistive load, current amplitude more normally moves and slightly reduces; 2, near current zero-crossing point, there be length " flat shoulder " at random; 3, the current waveform rate of change increases, and has size and the sudden change that constantly all has randomness; 4, the symmetry of waveform is destroyed.
According to above fault electric arc temporal signatures, present most of fault arc detection methods and holding circuit surpass threshold value as the compound criterion of judging fault electric arc with the variable quantity of " flat shoulder " time of adjacent half cycles electric current, mean value, maximal value, minimum value, rate of change di/dt.The required criterion of this method is more, and receives the interference of electronic power switch power supply and load change easily, and False Rate is higher.On the other hand, experts and scholars propose the frequency domain characteristic with methods analyst fault electric arcs such as discrete Fourier transformation, wavelet transformations both at home and abroad, though effect is preferably arranged, the hardware circuit of protective device are had relatively high expectations, and are difficult to promote the use of on a large scale.
Summary of the invention
The object of the invention is exactly for the defective that overcomes above-mentioned prior art existence fault arc detection method and the device thereof based on the time-frequency analysis-by-synthesis that a kind of computation complexity is low, safe, cost is low to be provided.
The object of the invention can be realized through following technical scheme:
A kind of fault arc detection method based on the time-frequency analysis-by-synthesis is characterized in that, may further comprise the steps:
1) electrification reset;
2) system initialization;
3) parameter initialization, the parameter assignment;
4) opening timing is interrupted, and starts the A/D conversion;
5) microprocessor is with time T
SampleAs the SI, the output voltage signal of real-time acquired signal modulate circuit and amplitude detection circuit;
6) according to preset threshold V
OverJudge output voltage signal V
AmpWhether overcurrent fault takes place, if V
Amp＜V
Over, then excess current does not take place in circuit, continues execution in step 7); If V
Amp＞V
Over, then circuit generation excess current jumps to step 10);
7) by V
AmpSet fault electric arc and detect each the threshold value Vth in the subroutine, Tmin, Dmin;
8) carry out fault electric arc and detect subroutine;
9) if do not break down electric arc, jump to step 5); If break down electric arc, jump to step 10);
10) microprocessor sends trip signal and drives dropout actuating mechanism disconnecting circuit, presses up to SR, and circuit is conducting again.
Described step 2) system initialization comprises the configuration of I/O mouth, A/D sample mode, sampling rate configuration, system clock, timer configuration.
Vth in the described step 7), Tmin, the implication of Dmin is following:
1) Vth is the pulse threshold value, when pulse during less than pulse threshold value Vth, judges it is not to be caused by arc fault, ignores these catastrophe points;
2) Tmin is an adjacent pulse variable quantity die-away time threshold value, when measured signal variable quantity die-away time during less than threshold value Tmin, judges that the current break signal is caused by normal load;
3) Dmin is that the electric arc half-wave is counted threshold value; The pulse that surpasses Vth from first amplitude begins circle statistics; In the setting-up time section, greater than threshold value Vth and adjacent die-away time variable quantity surpass threshold value Dmin greater than the pulse number of threshold value Tmin, then judge the electric arc that breaks down.
Described Vth, Tmin, the size of Dmin is by the amplitude detection circuit output voltage V
AmpThe height decision according to the selected threshold value of line current grade, helps to different capacity size, different types of load the fault electric arc protection being provided.
It is following that the fault electric arc of described step 8) detects subroutine procedure:
(1) real-time sampling is compared Sample_V through the signal Sample_V behind the signal conditioning circuit with pulse threshold value Vth, calculates the time span Ta [i] of Sample_V＞Vth; The time span Tb of Sample_V＜Vth [i];
(2) when less than the time span Tb [i] of threshold value＞0.5s, initialization fault electric arc trace routine, and return step (1); Otherwise forward step (3) to;
(3) T [i]=Ta [i]+Tb [i] is with all eight groups of time span summation Sum (T [0]: T [7]);
(4) if Sum (T [0]: T [7])＜0.5s calculates adjacent pulse variable quantity die-away time:
DT [i]=Tb [i]+Tb [i-1]-Tb [i-2]-Tb [i-3]; Otherwise i=i+1 forwards step (1) to;
(5) judge whether the current half-cycle ripple exists electric arc, if dT [i]＞Tmin, then D [i]=1; If dT [i]＜Tmin, then D [i]=0;
(6) with all eight labelled amount addition Sum (D [0]: D [7]), if Sum (D [0]: D [7])＞Dmin promptly has in a plurality of periodic circuits in the time span of 0.5s electric arc takes place, then judge to have fault electric arc, send trip signal; Otherwise i=i+1 forwards step (1) to.
A kind of device of described fault arc detection method based on the time-frequency analysis-by-synthesis; It is characterized in that; Comprise current transformer, voltage follower circuit, amplitude detection circuit, power module, signal conditioning circuit, microprocessor, dropout driving circuit, dropout actuating mechanism, reset circuit, test circuit and LED indicating circuit; Described current transformer is connected with voltage follower circuit, amplitude detection circuit respectively; Described power module is connected with voltage follower circuit, signal conditioning circuit, microprocessor respectively; Described microprocessor is connected with amplitude detection circuit, signal conditioning circuit, dropout driving circuit, reset circuit, test circuit and LED indicating circuit respectively, and described dropout driving circuit is connected with the dropout actuating mechanism.
Described signal conditioning circuit comprises rectification circuit, filtering circuit and the amplifying circuit that connects successively.
Described amplifying circuit is connected with microprocessor through the RC delay circuit, the power of pulse is converted into the length of die-away time through the RC delay circuit.
Described rectification circuit can carry out rectification to little signal to several millivolts; Thereby minimizing distorted signals; Guarantee the accuracy of detection; Parallel resistance R25 and capacitor C 12 between rectification circuit output end and ground can integration high frequency burr signals when breaking down electric arc, kept the characteristic quantity of fault electric arc.
Described filtering circuit comprises bivalent high-pass filter, and the cutoff frequency of this bivalent high-pass filter is elected 1kHz as.
Compared with prior art, the present invention has the following advantages:
1) solved the technical matters of accurate detection failure electric arc, overcome simple higher and merely from the shortcoming of the higher difficult popularization of frequency domain angle cost from time domain angle False Rate.
2) by the catastrophe point of high-frequency signal record circuit electric current; The pulse generation moment and strong and weak size variation by on time domain, shining upon catastrophe point fully judge whether to exist fault electric arc; Its effect is with very close based on the singular point detection method of wavelet analysis, but computation complexity is much lower.
3) can effectively detect fault electric arc under all kinds of civilian loading conditions, and when having the good arc of non-fault in the circuit or when the load that similar fault electric arc characteristic is arranged normally moves, not producing misoperation.
4) the frequency domain processing based on the hardware discrete component has reduced the requirement to microprocessor, and cost is minimized, and is convenient to penetration and promotion.
Description of drawings
Fig. 1 is a hardware configuration synoptic diagram of the present invention;
Fig. 2 is physical circuit figure of the present invention;
Fig. 3 is the resistive load fault electric arc signal waveform after overcommutation and high-pass filtering;
Fig. 4 is a microprocessor program process flow diagram in apparatus of the present invention;
Fig. 5 is that fault electric arc detects subroutine flow chart among Fig. 4;
Fig. 6 is typical civilian load 1500W insulating pot fault electric arc oscillogram;
Fig. 7 is typical civilian load 1000W desk lamp with dimmer switch fault electric arc oscillogram;
Fig. 8 is typical civilian load 300W PC fault electric arc oscillogram.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment
Like Fig. 1; A kind of device of described fault arc detection method based on the time-frequency analysis-by-synthesis; Comprise current transformer 1, voltage follower circuit 2, amplitude detection circuit 3, power module 4, signal conditioning circuit 5, microprocessor 6, dropout driving circuit 7, dropout actuating mechanism 8, reset circuit 9, test circuit 10 and LED indicating circuit 11; Described current transformer 1 is connected with voltage follower circuit 2, amplitude detection circuit 3 respectively; Described power module 4 is connected with voltage follower circuit 2, signal conditioning circuit 5, microprocessor 6 respectively; Described microprocessor 6 is connected with amplitude detection circuit 3, signal conditioning circuit 5, dropout driving circuit 7, reset circuit 9, test circuit 10 and LED indicating circuit 11 respectively, and described dropout driving circuit 7 is connected with dropout actuating mechanism 8.Described signal conditioning circuit 5 comprises rectification circuit 51, filtering circuit 52 and the amplifying circuit 53 that connects successively.
Physical circuit is as shown in Figure 2; Comprise the power circuit that power supply is provided to signal conditioning circuit and microprocessor; Be serially connected in the current transformer TA1 on circuit zero line or the live wire; Current transformer TA1 secondary side shunt load resistance R 3, output terminal connect voltage follower circuit and improve the sampled signal driving force.The voltage follower circuit output terminal connects the precise rectification circuit of amplitude detection circuit and band operational amplifier.Amplitude detection circuit will reflect the voltage signal input microprocessor U3 of line current size.Through the input of the signal behind precise rectification circuit bivalent high-pass filter, filtered signal is through amplifying and RC delay circuit input microprocessor sample port.The microprocessor module that has reset circuit is differentiated through fault electric arc, and the output trip signal is given the action of dropout driving circuit control trip circuit.Protective device also comprises LED indicating circuit etc. in addition.
Above-mentioned power circuit is made up of the resistance-capacitance depressurization mode.The voltage withstand class of C1 is at least 2 times of circuit grade of rated voltage, and parallel resistance R1 is that C1 provides the charge discharging resisting passage.C1 one end connects alternating current wires, and the other end is as the input of being made up of rectifier bridge D1, D2, D3, D4.Rectification bridge output end parallel connection smoothing capacity C2, the voltage of C2 load on divider resistance R2 and stabilivolt D5, D6 is last.D5, D6 two ends are parallelly connected filter capacitor C3, C4 respectively, for signal conditioning circuit provides power supply.The output of D6 is also as the input of three-terminal voltage-stabilizing chip U2, is connected filter capacitor C5 between the output of U2 and the ground, output with import between be connected diode D7.
Above-mentioned voltage follower circuit by operational amplifier U1A, be parallel to the U1A output terminal and constitute with the resistance R 5 of negative input, the resistance R 4 that an end is connected the U1A positive input.The other end of R4 connects Current Transformer Secondary side output terminal.
Above-mentioned precise rectification circuit is applicable to handles the less signal of amplitude, can carry out rectification to little signal to several millivolts, guarantees the accuracy that detects.It is by 2 operational amplifier U1B, U1C, and 2 diode D8, D9,7 resistance R 6, R7, R8, R9, R10, R11, R12 constitute.The negative terminal of D8 connects the negative input of U1B, the output terminal that anode connects U1B, and the negative terminal of D9 connects the output terminal of U1B, the end that anode connects R10.The output signal of voltage follower circuit is connected to the tie point of R6 and R9.Parallel resistance R25 and capacitor C 12 between precise rectification circuit output terminal and ground.
Above-mentioned second order high-pass filtering circuit is made up of serial connection capacitor C 6, C7 and stake resistance R13, R14.Operational amplifier U1D constitutes the in-phase proportion amplifying circuit with the resistance R that is connected to its inverting input and output terminal 16, the R15 that is serially connected with between its inverting input and the ground.Amplification circuit output end connects the anode of diode D10, and the negative terminal of D10 connects the delay circuit that is made up of resistance R 17 and capacitor C 8, plays the slow effect of falling of pulse signal.Diode D11 makes the signal voltage amplitude of input microprocessor in allowed band.More than three partial circuits form filtering, amplification, RC delay circuit jointly, constitute the signal conditioning circuit of protective device of the present invention jointly with precise rectification circuit.
Above-mentioned microprocessor module has by resistance R 18, capacitor C 9 and pushbutton switch S2 and constitutes reset circuit.Microprocessor U3 inside carries the ultra high speed A function; Gather fault electric arc current signal and amplitude detection signal in real time through conditioning; Fault electric arc trace routine by establishment is in advance differentiated the electric arc that whether breaks down, and sends trip signal to the dropout driving circuit.
Above-mentioned LED indicating circuit is divided into two groups, is made up of with light emitting diode D17 with light emitting diode D16 and resistance R 24 resistance R 23 respectively, and indication fault electric arc takes place and the protective device working condition respectively.
Above-mentioned dropout driving circuit is made up of resistance R 21, R22, optocoupler U4, triode Q1.The trip signal that R21 one end connects microprocessor sends end, and the other end connects the input end of optocoupler U4.R22 one end connects the output terminal of U4, and the other end connects the base stage of Q1.Diode D14, D15 reversal connection be in two control ends of relay, the influence of big electric current in the time of can effectively protecting triode Q1 to avoid relay to open and close.Pushbutton switch S1 and capacitor C 11 constitute test circuit, can regularly verify dropout driving circuit and dropout actuating circuit validity.
Above-mentioned amplitude detection circuit is by resistance R 19, R20, capacitor C 10, and diode D12, D13 constitute.The D12 anode links to each other with the voltage follower circuit output terminal, prevents the electric current anti-phase.Diode D13 makes the signal voltage amplitude of input microprocessor in allowed band.
Fig. 3 is through the resistive load fault electric arc signal waveform after precision rectifying and the high-pass filtering.Behind the treatment steps such as the current signal process precision rectifying that current transformer is gathered, high-pass filtering, amplitude amplification, signal has kept sudden change information well in the filtering first-harmonic, and the sudden changes that difference is big or small are with the impulse form performance of difference height.The height different pulse is through behind the RC delay circuit, its die-away time obvious difference, based on this characteristic, record is higher than the time span Ta [0] of threshold value Vth: Ta [7] and the criterion of the time span Tb [0] that is lower than threshold value Vth: Tb [7] as the fault electric arc judgement.
Fig. 4 is a microprocessor program process flow diagram in apparatus of the present invention.As shown in Figure 4, the workflow of microprocessor is following:
1) electrification reset;
2) system initialization;
3) parameter initialization, the parameter assignment;
4) opening timing is interrupted, and starts the A/D conversion;
5) microprocessor is with time T
SampleAs the SI, the output voltage signal of real-time acquired signal modulate circuit and amplitude detection circuit;
6) according to preset threshold V
OverJudge output voltage signal V
AmpWhether overcurrent fault takes place, if V
Amp＜V
Over, then excess current does not take place in circuit, continues execution in step 7); If V
Amp＞V
Over, then circuit generation excess current jumps to step 10);
7) by V
AmpSet fault electric arc and detect each the threshold value Vth in the subroutine, Tmin, Dmin;
8) carry out fault electric arc and detect subroutine;
9) if do not break down electric arc, jump to step 5); If break down electric arc, jump to step 10);
10) microprocessor sends trip signal and drives dropout actuating mechanism disconnecting circuit, presses up to SR, and circuit is conducting again.
Described step 2) system initialization comprises the configuration of I/O mouth, A/D sample mode, sampling rate configuration, system clock, timer configuration.
Vth in the described step 7), Tmin, the implication of Dmin is following:
1) Vth is the pulse threshold value, when pulse during less than pulse threshold value Vth, judges it is not to be caused by arc fault, ignores these catastrophe points;
2) Tmin is an adjacent pulse variable quantity die-away time threshold value, when measured signal variable quantity die-away time during less than threshold value Tmin, judges that the current break signal is caused by normal load;
3) Dmin is that the electric arc half-wave is counted threshold value; The pulse that surpasses Vth from first amplitude begins circle statistics; In the setting-up time section, greater than threshold value Vth and adjacent die-away time variable quantity surpass threshold value Dmin greater than the pulse number of threshold value Tmin, then judge the electric arc that breaks down.
Described Vth, Tmin, the size of Dmin is by the amplitude detection circuit output voltage V
AmpThe height decision according to the selected threshold value of line current grade, helps to different capacity size, different types of load the fault electric arc protection being provided.
As shown in Figure 5, it is following that the fault electric arc of described step 8) detects subroutine procedure:
(1) real-time sampling is compared Sample_V through the signal Sample_V behind the signal conditioning circuit with pulse threshold value Vth, calculates the time span Ta [i] of Sample_V＞Vth; The time span Tb of Sample_V＜Vth [i];
(2) when less than the time span Tb [i] of threshold value＞0.5s, initialization fault electric arc trace routine, and return step (1); Otherwise forward step (3) to;
(3) T [i]=Ta [i]+Tb [i] is with all eight groups of time span summation Sum (T [0]: T [7]);
(4) if Sum (T [0]: T [7])＜0.5s calculates adjacent pulse variable quantity die-away time:
DT [i]=Tb [i]+Tb [i-1]-Tb [i-2]-Tb [i-3]; Otherwise i=i+1 forwards step (1) to;
(5) judge whether the current half-cycle ripple exists electric arc, if dT [i]＞Tmin, then D [i]=1; If dT [i]＜Tmin, then D [i]=0;
(6) with all eight labelled amount addition Sum (D [0]: D [7]), if Sum (D [0]: D [7])＞Dmin promptly has in a plurality of periodic circuits in the time span of 0.5s electric arc takes place, then judge to have fault electric arc, send trip signal; Otherwise i=i+1 forwards step (1) to.
Annotate: the value of i is 0～7, when i=8, the value of i is made as 0.Program uses the mode of circulation storage to store D [0]: D [7], Ta [0]: Ta [7], and Tb [0]: Tb [7], T [0]: T [7] can effectively save internal memory.
Vth, Tmin, Dmin are according to the selected threshold value of circuital current grade, and selected the helping of threshold value with self-adaptation control characteristic provides the fault electric arc protection to different capacity size, different types of load.
Fig. 6 is a 1500W insulating pot fault electric arc oscillogram, and passage 1 is a load current waveform; Passage 2 is for the pulse signal through precision rectifying and high-pass filtering, as the criterion of microprocessor fault electric arc trace routine; Passage 3 is the output of microprocessor trip signal, and high level is corresponding threads off the actuating of relay; Passage 4 is an electric arc voltage waveform.As shown in the figure, load current waveform is sinusoidal wave when normal operation, and through the effect of modulate circuit, passage 2 is shown as the straight line of zero level; Load current waveform exists " flat shoulder " and sudden change when breaking down electric arc, in passage 2, has the pulse signal of reflection " flat shoulder " size and sudden change degree.Signal in the real-time acquisition channel 2 of microprocessor, when the 8th half cycles electric arc took place, microprocessor sent trip signal and drives the disconnecting mechanism action.
Fig. 7 is a 1000W desk lamp with dimmer switch fault electric arc oscillogram, and Fig. 8 is a 300W PC fault electric arc oscillogram.Desk lamp with dimmer switch and PC are typical electronic power switch power supplys, and load current waveform just exists periodic " flat shoulder " and sudden change when normal operation.As shown in Figure 7, in passage 2, there is pulse signal when normally moving.Can effectively distinguish fault electric arc and the normal running load of similar fault electric arc characteristic is arranged through adjacent pulse variable quantity die-away time threshold value in the fault electric arc trace routine, thereby avoid misoperation.After in the circuit eight half cycles fault electric arcs taking place, microprocessor just sends trip signal, and this point can obtain checking by Fig. 7.
The present invention is not limited to above embodiment; As long as the fault arc detection method that has adopted the present invention to propose based on the time-frequency analysis-by-synthesis; No matter adopt which kind of signal conditioning circuit or the thread off driving circuit or other the equal replacements such as actuating mechanism or microprocessor of threading off, all fall within protection scope of the present invention.
Claims (10)
1. the fault arc detection method based on the time-frequency analysis-by-synthesis is characterized in that, may further comprise the steps:
1) electrification reset;
2) system initialization;
3) parameter initialization, the parameter assignment;
4) opening timing is interrupted, and starts the A/D conversion;
5) microprocessor is with time T
SampleAs the SI, the output voltage signal of real-time acquired signal modulate circuit and amplitude detection circuit;
6) according to preset threshold V
OverJudge output voltage signal V
AmpWhether overcurrent fault takes place, if V
Amp＜V
Over, then excess current does not take place in circuit, continues execution in step 7); If V
Amp＞V
Over, then circuit generation excess current jumps to step 10);
7) by V
AmpSet fault electric arc and detect each the threshold value Vth in the subroutine, Tmin, Dmin;
8) carry out fault electric arc and detect subroutine;
9) if do not break down electric arc, jump to step 5); If break down electric arc, jump to step 10);
10) microprocessor sends trip signal and drives dropout actuating mechanism disconnecting circuit, presses up to SR, and circuit is conducting again.
2. a kind of fault arc detection method based on the time-frequency analysis-by-synthesis according to claim 1 is characterized in that described step 2) system initialization comprises the configuration of I/O mouth, A/D sample mode, sampling rate configuration, system clock, timer configuration.
3. a kind of fault arc detection method based on the time-frequency analysis-by-synthesis according to claim 1 is characterized in that, the Vth in the described step 7), and Tmin, the implication of Dmin is following:
1) Vth is the pulse threshold value, when pulse during less than pulse threshold value Vth, judges it is not to be caused by arc fault, ignores these catastrophe points;
2) Tmin is an adjacent pulse variable quantity die-away time threshold value, when measured signal variable quantity die-away time during less than threshold value Tmin, judges that the current break signal is caused by normal load;
3) Dmin is that the electric arc half-wave is counted threshold value; The pulse that surpasses Vth from first amplitude begins circle statistics; In the setting-up time section, greater than threshold value Vth and adjacent die-away time variable quantity surpass threshold value Dmin greater than the pulse number of threshold value Tmin, then judge the electric arc that breaks down.
4. a kind of fault arc detection method based on the time-frequency analysis-by-synthesis according to claim 3 is characterized in that, described Vth, and Tmin, the size of Dmin is by the amplitude detection circuit output voltage V
AmpThe height decision according to the selected threshold value of line current grade, helps to different capacity size, different types of load the fault electric arc protection being provided.
5. a kind of fault arc detection method based on the time-frequency analysis-by-synthesis according to claim 3 is characterized in that, it is following that the fault electric arc of described step 8) detects subroutine procedure:
(1) real-time sampling is compared Sample_V through the signal Sample_V behind the signal conditioning circuit with pulse threshold value Vth, calculates the time span Ta [i] of Sample_V＞Vth; The time span Tb of Sample_V＜Vth [i];
(2) when less than the time span Tb [i] of threshold value＞0.5s, initialization fault electric arc trace routine, and return step (1); Otherwise forward step (3) to;
(3) T [i]=Ta [i]+Tb [i] is with all eight groups of time span summation Sum (T [0]: T [7]);
(4) if Sum (T [0]: T [7])＜0.5s calculates adjacent pulse variable quantity die-away time:
DT [i]=Tb [i]+Tb [i-1]-Tb [i-2]-Tb [i-3]; Otherwise i=i+1 forwards step (1) to;
(5) judge whether the current half-cycle ripple exists electric arc, if dT [i]＞Tmin, then D [i]=1; If dT [i]＜Tmin, then D [i]=0;
(6) with all eight labelled amount addition Sum (D [0]: D [7]), if Sum (D [0]: D [7])＞Dmin promptly has in a plurality of periodic circuits in the time span of 0.5s electric arc takes place, then judge to have fault electric arc, send trip signal; Otherwise i=i+1 forwards step (1) to.
6. the device of the fault arc detection method based on the time-frequency analysis-by-synthesis as claimed in claim 1; It is characterized in that; Comprise current transformer, voltage follower circuit, amplitude detection circuit, power module, signal conditioning circuit, microprocessor, dropout driving circuit, dropout actuating mechanism, reset circuit, test circuit and LED indicating circuit; Described current transformer is connected with voltage follower circuit, amplitude detection circuit respectively; Described power module is connected with voltage follower circuit, signal conditioning circuit, microprocessor respectively; Described microprocessor is connected with amplitude detection circuit, signal conditioning circuit, dropout driving circuit, reset circuit, test circuit and LED indicating circuit respectively, and described dropout driving circuit is connected with the dropout actuating mechanism.
7. the device of a kind of fault arc detection method based on the time-frequency analysis-by-synthesis according to claim 6 is characterized in that, described signal conditioning circuit comprises rectification circuit, filtering circuit and the amplifying circuit that connects successively.
8. the device of a kind of fault arc detection method based on the time-frequency analysis-by-synthesis according to claim 7; It is characterized in that; Described amplifying circuit is connected with microprocessor through the RC delay circuit, the power of pulse is converted into the length of die-away time through the RC delay circuit.
9. the device of a kind of fault arc detection method based on the time-frequency analysis-by-synthesis according to claim 7; It is characterized in that described rectification circuit can carry out rectification to little signal to several millivolts, thereby reduce distorted signals; Guarantee the accuracy of detection; Parallel resistance R25 and capacitor C 12 between rectification circuit output end and ground can integration high frequency burr signals when breaking down electric arc, kept the characteristic quantity of fault electric arc.
10. the device of a kind of fault arc detection method based on the time-frequency analysis-by-synthesis according to claim 7 is characterized in that described filtering circuit comprises bivalent high-pass filter, and the cutoff frequency of this bivalent high-pass filter is elected 1kHz as.
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| CN103278734A (en) * | 2013-06-26 | 2013-09-04 | 浙江爱德电子有限公司 | Arc fault detection device and detection method thereof |
| CN103376389A (en) * | 2013-07-30 | 2013-10-30 | 广东雅达电子股份有限公司 | Fault electric arc judgment system for low-voltage line and judgment method thereof |
| CN104348143A (en) * | 2013-08-06 | 2015-02-11 | 通用电气航空系统有限公司 | Method and system for detecting the accurate operation of an arc fault/transient detector |
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