CN104635128A

CN104635128A - Arc fault recognition capability experimental analysis device and experimental analysis method thereof

Info

Publication number: CN104635128A
Application number: CN201510063422.8A
Authority: CN
Inventors: 许志红; 周志炜
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2015-02-06
Filing date: 2015-02-06
Publication date: 2015-05-20
Anticipated expiration: 2035-02-06
Also published as: CN104635128B

Abstract

The invention relates to an arc fault recognition capability experimental analysis device and an experimental analysis method thereof. The arc fault recognition capability experimental analysis device comprises an upper computer test control and analysis module, a lower computer and a communication module, wherein the communication module is used for realizing communication between the upper computer test control and analysis module and the lower computer, the lower computer comprises an AFCI (arc fault circuit interrupter) action feature test module used for testing tested AFCI action features and an electronic test module, the arc fault recognition capability experimental analysis device also comprises a collecting module, the collecting module is used for receiving arc fault signals sent by the AFCI action feature test module, realizing conditioning, collection, conversion and measurement on the arc fault signals, and sending the arc fault signals to the upper computer test control and analysis module to be processed, and the upper computer test control and analysis module realizes data exchange with the AFCI action feature test module through the communication module. The arc fault recognition capability experimental analysis device and the experimental analysis method have the advantages that the automatic monitoring and warning function and the test data analysis function are realized, and the arc fault recognition capability analysis speed of an AFCI is greatly accelerated.

Description

Arc fault recognition capability analysis of experiments device and test analysis method thereof

Technical field

The present invention relates to a kind of arc fault recognition capability analysis of experiments device and test analysis method thereof.

Background technology

In recent years, there is the first place that number and direct loss occupy all kinds of cause of fire always in electrical fire, and in electrical fire, major part is caused by arc resistance faults such as short circuit, electric leakage, loose contacts.In low-voltage power supply and distribution system, the origin cause of formation of fault electric arc is mainly divided into two classes, and a class is that another kind of is result between two electrodes closely along insulator partially conductive surface.The former is heated for a long time due to insulator or contingency electric spark occurs, and causes insulating surface carbonization and forms arc channel; The latter touches ground conduit due to energized conductor, or the insulation of cable is scratched by sharp-pointed metal.Arc fault is mainly divided into series arc faults, parallel arc fault and ground arc fault three class.Ground arc fault, because of similar to parallel arc fault characteristic, also can be classified as parallel arc fault.Due to traditional protective device, as isolating switch, fuse, residual current operated protective device, all effectively cannot detect arc fault, the series arc faults that especially fault current is less, therefore cannot contain the fire that arc fault causes.

Arc-fault circuit interrupter (AFCI), having another name called arc fault detection device (AFDD) is novel fire-proof protective device, possesses arc fault detection ability, can cut off circuit, took precautions against in not " combustion " before fire occurs.At present, the General Electric of the U.S., the Siemens of Germany, there have been AFCI product in the companies such as the Schneider of France.But there is the problems such as undetected and flase drop in existing electric arc AFCI.The standard UL1699 " arc-fault circuit interrupter " that the U.S. formulates is the compulsory standard of the arc fault detection performance of inspection AFCI.UL1699 standard has 26 tests, except regular circuit breakers test, also has three tests detecting AFCI arc fault recognition capability, i.e. false tripping test, arc fault detection test and operation inhibition test.Wherein, whether false tripping test can thread off when circuit normally works extremely for detecting AFCI, and all the other two tests are all by simulation physical fault electric arc, check the electric arc recognition performance of AFCI.The method of simulation physical fault electric arc has three kinds, and the first utilizes carbon-point and copper rod point discharge to produce fault electric arc, and the second is carbonized path test method, and the third is point cantact arc test method.In all fault electric arc simulation method for generation, the method closest to actual arc failure condition is carbonized path test method.Carbonized path test method is by modes such as high pressure carbonizations, forms carbonization passage, and then produce fault electric arc at the insulating surface of test cable.Carbonized path test is adopted to test fault electric arc isolating switch and test; it is the test that must carry out; carbonized path experimental phenomena and Wave data study the important Data Source of fault electric arc detection technique simultaneously, is also the important means of effective inspection fault electric arc breaker protective property.Although, China has formulated the carbonized path test standard and test method of fault electric arc isolating switch, but, because carbonized path process of the test is complicated, poor containing high voltage circuit test macro safety coefficient, moreover the carbonization passage that high pressure carbonization is formed is unstable, satisfactory waveform success ratio is low, gather difficulty, can produce the noxious materials such as a large amount of dioxin, hydrogen chloride, phenyl ring, contaminated environment during test cable burning.Result in fault electric arc carbonized path test difficulty for all the foregoing reasons, be badly in need of the fault electric arc carbonized path analysis of experiments device of a kind of Based Intelligent Control of development, energy-conserving and environment-protective, easy to operate, use safety.

And false tripping test, therefore during test fee, effort test event reaches 18, often completes a test, will change test load and rewiring.The present invention devises the open database of host computer and wave form analysis module, typical waveform in process of the test is stored, and devise fault waveform output module, by typical waveform after the process of output module, directly output in the system being connected to fault electric arc isolating switch, with the Fault Identification ability of criterion fault electric arc isolating switch easily.

List of references

[1] Qi Zibo, Gao Wei. series fault arc ignition behavior experimental study [A]; 2012(Shenyang) world security science and technology scientific seminar collection of thesis [C]; 2012.

[2] Zhao Changzheng, Di Man, Gao Wei. electrical fire control and technique for investigation [M]. Shenyang: publishing house of Liaoning University, 2012

[3] Wu Zhouxiong, Liu Hanning, Liu Qingrui. the research of fault electric arc sniffer and development trend [J]. low-voltage electrical apparatus, 2014,05:5-7.

[4] Liu Jinyan, Ji Huiyu, Huang wu is outstanding, etc. family expenses electric arc fault protection electrical equipment development Overview [J]. electrical equipment and energy efficiency management technology, 2014,11.

[5] Zhou Jigang, Liu Jinyan. arc-fault circuit interrupter detection technique and relevant criterion [J]. low-voltage electrical apparatus, 2013,22:50-56.

[6] Luo Lei, Liu Hui. brief talk arc-fault circuit interrupter [J]. low-voltage electrical apparatus, 2009,14:33-35.

[7] C Ximena Restrepo, PS Si Tali, A Na Yake, V meter Ka Ni, etc. for carrying out the system and method [P] of arc fault detection. the U.S.: CN101573847,2009.

[8] ENGEL J C. Combination AFCIs: what they will and will not do[C] // Electrical Safety Workshop (ESW),2012 IEEE IAS, Daytona Beach, FL, Jan 31-Feb 3, 2012:1-18.

[9] MARTEL J M, ANHEUSER M, BERGER F. A study of arcing fault in the low-voltage electrical installation[C] //2010 Proceedings of the 56th IEEE Holm Conference, Charleston, SC, Oct 4-7, 2010: 1-11.

[10] UL 1699: Arc-Fault Circuit-Interrupters.

[11] Liu Jinyan, Li Hui, Zhang Jianbing, Huang Jingye. arc-fault circuit interrupter UL research on standard [J]. low-voltage electrical apparatus, 2011,18:56-59.

[12] Shea, J.J. Comparing 240 Vrms to 120 Vrms Series Arcing Faults in Residential Wire[C]// 2008 Proceedings of the 54th IEEE Holm Conference.

[13] Zheng Xin, Xu Zhihong. the morphological wavelet analysis [J] of low voltage failure electric arc. low-voltage electrical apparatus, 2013,20:1-4.

[14] Lu Qiwei, Wu Haidong, Wang Suke, Kong Deyu. the research [J] that the fault electric arc based on difference mean square root method detects. low-voltage electrical apparatus, 2013,01:6-10.

[15] account for friend male, open and recognize into, Yang Jianhong, etc. based on the series arc faults diagnostic method [J] of Camberra distance. protecting electrical power system and control, 2014,12:30-36.

[16] Huo Liuhang. the wireless electric fire early-warning system based on information fusion studies [D]. Institutes Of Technology Of He'nan, 2011.

[17] Liu Peng, Zhang Feng, Zhang Shiwen. based on the research [J] of the fault arc detection device of neural network. low-voltage electrical apparatus, 2013,17:1-6..

Summary of the invention

The object of the present invention is to provide one to have monitoring and warning function, test data analyzer function automatically, greatly improve arc fault recognition capability analysis of experiments device and the test analysis method thereof of the arc fault recognition capability analysis speed of arc-fault circuit interrupter.

For achieving the above object, technical scheme of the present invention is: a kind of arc fault recognition capability analysis of experiments device, comprise host computer observing and controlling and analysis module, slave computer, realize the communication module that host computer observing and controlling communicates with between analysis module and slave computer, described slave computer comprises AFCI acting characteristic test module for testing tested AFCI acting characteristic and electronic type test module; Also comprise an acquisition module, for receiving the arcing fault signal that described AFCI acting characteristic test module sends, realize the conditioning to arcing fault signal, collection, conversion and measurement, and being sent to described host computer observing and controlling and analysis module processes, then host computer observing and controlling and analysis module realize the exchanges data with AFCI acting characteristic test module by described communication module.

In embodiments of the present invention, the data process&analysis module that described host computer observing and controlling and analysis module comprise a human-computer interaction module be connected with described communication module and be connected successively with this human-computer interaction module, data read module, data memory module and voltage waveform data storehouse, described data memory module is also connected with a current waveform data storehouse, described voltage, current waveform data storehouse is all connected to described human-computer interaction module, described voltage, current waveform data storehouse is also connected to described electronic type test module, described data read module is also connected with described acquisition module, described human-computer interaction module comprises a human-computer interaction interface.

In embodiments of the present invention, described AFCI acting characteristic test module comprises the control module be connected with described communication module and acquisition module and the illuminant module be connected with this control module, flame sensing module, driver module and dropout sensing module, described illuminant module, flame sensing module, driver module and dropout sensing module are all tested main circuit with an AFCI acting characteristic and are connected, and described AFCI acting characteristic test main circuit is also connected to described acquisition module.

In embodiments of the present invention, described AFCI acting characteristic test main circuit comprises tested AFCI, test cable, the first to the 8th switch, transformer, lamp, the first to the second load, and described 6th, the 7th switch is two-way switch; Described first switch, transformer and test cable composition high pressure carbonization circuit, carries out high pressure carbonization to test cable; Described tested AFCI, second, third and the 8th switch, lamp and test cable composition carbonization decision circuitry, for judging whether carbonization completes; Described tested AFCI, second, the 4th to the 8th switch, the first to the second load and test cable composition hookup, for testing the electric arc recognition performance of tested AFCI; Whether described tested AFCI, the 6th and the 7th switch, the first load and the second load composition false tripping hookup, can thread off when circuit normally works extremely for detecting tested AFCI.

In embodiments of the present invention, described first load is adjustable resistive load, described second load is the respective load specified in standard, and the respective load specified in described standard comprises 18 kinds of loads of false tripping testing standard regulation and 5 kinds of loads of shielding load test standard regulation.

In embodiments of the present invention, described electronic type test module comprises first and second signal generating module, low-voltage, high-current generation module, the rated voltage big current generation module that are connected with voltage, current waveform data storehouse respectively, described first signal generating module and described low-voltage, high-current generation model calling, described secondary signal generation module respectively with described low-voltage, high-current generation module and rated voltage big current generation model calling.

Present invention also offers a kind of test analysis method based on arc fault recognition capability analysis of experiments device described above, comprise the steps,

Step S1: carry out carbonized path test, comprises the test of series arc faults carbonized path, the test of parallel arc fault carbonized path and carbonized path ignition test;

1. series arc faults carbonized path test:

(1) test current is set by human-computer interaction interface, prepares test cable;

(2) AFCI acting characteristic test module powers on, and control module, illuminant module, driver module power on simultaneously, controls the first to the 8th switch and disconnects;

(3) host computer observing and controlling and analysis module send work order to control module by communication module, control the switching sequence of described AFCI acting characteristic test main circuit: closed 8th switch, control the 6th switch and make the first load access main circuit; First switch closes, and transformer carries out carbonization to test cable; First switch opens, second, third switch closes, and carbonization decision circuitry works, if lamp is bright, then carbonization success, and perform step (4); If lamp is dark, then carbonization failure, re-executes step (3); Described carbonization decision circuitry is made up of tested AFCI, second, third and the 8th switch, lamp and test cable;

(4) the 3rd switch opens, the 4th switch are closed, lamp is excised from main circuit, test cable and the first load in series, and produce fault electric arc signal, simultaneously, acquisition module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer observing and controlling and analysis module;

(5) second, the 4th switch is opened after closed setting-up time, and meanwhile, acquisition module quits work;

(6) data memory module obtains test waveform data from data read module, and Wave data is stored in voltage waveform data storehouse and current waveform data storehouse; Data process&analysis module obtains test waveform data from data read module, and carries out treatment and analyses to Wave data, determines the drop-away time of tested AFCI; If drop-away time is less than or equal to predetermined drop-away time, then judge that tested AFCI is qualified; Otherwise, defective;

2. parallel arc fault carbonized path test:

(2) host computer observing and controlling and analysis module send work order to control module by communication module, control the switching sequence of described AFCI acting characteristic test main circuit: control the first to the 8th switch opens; 8th switch closes, and controls the 6th switch and makes the first load access main circuit; Second switch is opened, and the first switch closes, and transformer carries out carbonization to test cable, and carbonization time is 10 seconds; First switch opens, the second, the 4th switch closes, test current flows through the 8th switch, tested AFCI, second switch, test cable, the 4th switch, the 6th switch, the first load, conduction time is 10 seconds, simultaneously, acquisition module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer observing and controlling and analysis module;

(3) first, second switch repeats the switching sequence of step (2), until there is following arbitrary situation: test period reaches 5 minutes, flame sensing module detects that cotton catches fire, dropout sensing module detects that tested AFCI threads off or 0.5 second internal fault current half wave number is more than or equal to 8; Within described 0.5 second, internal fault current half wave number is counted by data process&analysis module;

(4) the on/off switch state of tested AFCI and the data of flame sensing module are fed back to host computer observing and controlling and analysis module by communication module by control module;

(5) data memory module obtains test waveform data from data read module, and Wave data is stored in voltage waveform data storehouse and current waveform data storehouse; Data process&analysis module obtains test waveform data from data read module, and treatment and analyses is carried out to Wave data, calculate 0.5 second internal fault current half wave number, when within 0.5 second, internal fault current half wave number reaches 8 time, if tested AFCI threads off, then judge that tested AFCI is qualified; Otherwise, defective;

3. carbonized path ignition test:

(3) first, second switch repeats the switching sequence of step (2), until there is following arbitrary situation: test period reaches 5 minutes, flame sensing module detects that cotton catches fire, dropout sensing module detects that tested AFCI threads off;

(5) data memory module obtains test waveform data from data read module, and Wave data is stored in voltage waveform data storehouse and current waveform data storehouse; Data process&analysis module obtains test waveform data from data read module, and carries out treatment and analyses to Wave data, judges the dropout situation of AFCI, if before cotton catches fire, tested AFCI threads off, then AFCI is qualified; Otherwise, defective;

Step S2: carry out shielding load test, comprises the carbonized path ignition test of shielding load arc fault test and band shielding load;

1. the test of load arc fault is shielded:

(1) by the load of human-computer interaction interface Selection experiment, test current is set, prepare test cable;

(2) host computer observing and controlling and analysis module send work order to control module by communication module, control the switching sequence of described AFCI acting characteristic test main circuit:

Carry out main line Test to Failure: control the first to the 8th switch opens; Closed 8th switch, control the 6th, the 7th switch and make first, second load access main circuit, be connected with test cable after first, second load parallel connection simultaneously, the first switch closes, and transformer carries out carbonization to test cable; First switch opens, second, third switch closes, and carbonization decision circuitry works, if lamp is bright, then carbonization success; If lamp is dark, then carbonization failure, needs carbonization again; Described carbonization decision circuitry is made up of tested AFCI, second, third and the 8th switch, lamp and test cable; 3rd switch opens, the 4th switch are closed, lamp is excised from main circuit, first, second load access main circuit, and produce fault electric arc signal, simultaneously, acquisition module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer observing and controlling and analysis module; The second, the 4th switch is opened after closed setting-up time, and meanwhile, acquisition module quits work;

Carry out the first branch trouble test: control the first to the 8th switch opens; Closed 8th switch, control the 6th, the 7th switch and make first, second load access main circuit, now, the first load is connected with test cable, the second load is not connected with test cable, and the first switch closes, and transformer carries out carbonization to test cable; First switch opens, second, third switch closes, and carbonization decision circuitry works, if lamp is bright, then carbonization success; If lamp is dark, then carbonization failure, needs carbonization again; Described carbonization decision circuitry is made up of tested AFCI, second, third and the 8th switch, lamp and test cable; 3rd switch opens, the 4th switch are closed, lamp is excised from main circuit, test cable and the first load in series, and produce fault electric arc signal, simultaneously, acquisition module starts acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer observing and controlling and analysis module; The second, the 4th switch is opened after closed setting-up time, and meanwhile, acquisition module quits work;

Carry out the second branch trouble test: carry out the first branch trouble test: control the first to the 8th switch opens; Closed 8th switch, control the 6th, the 7th switch and make first, second load access main circuit, now, the first load is not connected with test cable, the second load is connected with test cable, and the first switch closes, and transformer carries out carbonization to test cable; First switch opens, second, third switch closes, and carbonization decision circuitry works, if lamp is bright, then carbonization success; If lamp is dark, then carbonization failure, needs carbonization again; Described carbonization decision circuitry is made up of tested AFCI, second, third and the 8th switch, lamp and test cable; 3rd switch opens, the 4th switch are closed, lamp is excised from main circuit, test cable and the second load in series, and produce fault electric arc signal, simultaneously, acquisition module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer observing and controlling and analysis module; The second, the 4th switch is opened after closed setting-up time, and meanwhile, acquisition module quits work;

(3) data memory module obtains test waveform data from data read module, and Wave data is stored in voltage waveform data storehouse and current waveform data storehouse; Data process&analysis module obtains test waveform data from data read module, and carries out treatment and analyses to Wave data, determines the drop-away time of tested AFCI; If drop-away time is less than or equal to predetermined drop-away time, then judge that tested AFCI is qualified; Otherwise, defective;

2. the carbonized path ignition test of band shielding load:

(2) host computer observing and controlling and analysis module send work order to control module by communication module, control the switching sequence of described AFCI acting characteristic test main circuit: control the first to the 8th switch opens; 8th switch closes, and controls the 7th switch and makes the second load access main circuit; Second switch is opened, and the first, the 5th switch closes, and transformer carries out carbonization to test cable, and carbonization time is 10 seconds, and the second load simultaneously normally works; The first, the 5th switch opens, the second, the 4th switch closes, test current flows through the 8th switch, tested AFCI, second switch, test cable, the 4th switch, the 7th switch, the second load, conduction time is 10 seconds, simultaneously, acquisition module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer observing and controlling and analysis module;

(3) first, second, the 5th switch repeats the switching sequence of step (2), until there is following arbitrary situation: test period reaches 5 minutes, flame sensing module detects that cotton catches fire, dropout sensing module detects that tested AFCI threads off;

Step S3: carry out false tripping test:

(1) host computer testing and analyzing module sends work order to control module, control the switching sequence of described AFCI acting characteristic test main circuit: control the first to the 8th switch opens, 8th switch closes, control the 7th switch and make the second load access main circuit, wherein, control the 6th switch, first load is tested in electric hand drill multi-load, access main circuit during fluorescent light multi-load test, first load not place in circuit during all the other tests, acquisition module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer testing and analyzing module,

(2) after reaching setting threshold time, the 7th, the 8th switch opens, the on/off switch state of tested AFCI is fed back to host computer testing and analyzing module by communication module by control module;

(3) data memory module obtains test waveform data from data read module, and Wave data is stored in voltage waveform data storehouse and current waveform data storehouse, host computer testing and analyzing module judges the dropout situation of AFCI, if AFCI threads off, then judge that false tripping phenomenon occurs AFCI, AFCI is defective; If AFCI does not thread off, then AFCI is qualified.

Compared to prior art, the present invention has following beneficial effect:

1, apparatus of the present invention have monitoring and warning function automatically, improve automaticity and the security of carbonized path test, device is when cotton catches fire, give the alarm and automatically cut off main circuit, need not manual power-off, improve the security of test, illuminant module can judge whether carbonization completes test cable, whether dropout sensing module can thread off by arc-fault circuit interrupter contact in automatic decision process of the test, need not artificial observation;

2, apparatus of the present invention have test data analyzer function, data process&analysis module can judge whether test figure meets UL1699 standard-required, and judge that whether test is successful and whether tested arc-fault circuit interrupter is qualified, in addition, the feature of all right analytical test voltage current waveform of data process&analysis module, comprise harmonic wave distribution, zero stops the time, wavelet energy entropy etc.;

3, according to standard, three kinds of test main circuits, false tripping test main circuit and shielding load test main circuit that carbonized path is tested are integrated, devise AFCI acting characteristic test main circuit, utilize this main circuit except the every test of carbonized path can be completed, false tripping test and shielding load test can also be completed, thus simplify the switch step of test main circuit, in addition, device is assembled with switch for each test load, and can automatically switch, facilitate the replacement of test load, improve testing efficiency;

4, the trial voltage current waveform data stored can be processed, and realize waveform reduction by electronic type test module, thus test the performance of AFCI quickly and easily, increase substantially testing efficiency.

Accompanying drawing explanation

Fig. 1 is the overall theory diagram of arc fault recognition capability analysis of experiments device of the present invention.

Fig. 2 is AFCI acting characteristic of the present invention test main circuit principle schematic.

Fig. 3 is arc fault generation position view.

Embodiment

Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically described.

As shown in Figure 1, arc fault recognition capability analysis of experiments device of the present invention comprises host computer observing and controlling and analysis module, the arc-fault circuit interrupter AFCI(Arc Fault Circuit Interrupters of slave computer) acting characteristic test module and the several part of electronic type test module.The connection of setting up upper and lower computer of communication module and acquisition module with communicate.AFCI acting characteristic test module and electronic type test module are for testing the acting characteristic of tested AFCI; Sampling module receives the arcing fault signal that AFCI acting characteristic test module sends, and realizes the conditioning to arcing fault signal, collection, conversion and measurement, and sends to host computer observing and controlling and analysis module; Host computer observing and controlling and analysis module to the process of test waveform data, analysis, storage, output, and realize the exchanges data with AFCI acting characteristic test module by communication module.

In the present embodiment, the data process&analysis module that described host computer observing and controlling and analysis module comprise a human-computer interaction module be connected with described communication module (this human-computer interaction module comprises for the human-computer interaction interface of man-machine interaction) and be connected successively with this human-computer interaction module, data read module, data memory module and voltage waveform data storehouse, described data memory module is also connected with a current waveform data storehouse, described voltage, current waveform data storehouse is all connected to described human-computer interaction module, institute's voltage, current waveform data storehouse is also connected to described electronic type test module, described data read module is also connected with described acquisition module.Described AFCI acting characteristic test module comprises the control module be connected with described communication module and acquisition module and the illuminant module be connected with this control module, flame sensing module, driver module and dropout sensing module, described illuminant module, flame sensing module, driver module and dropout sensing module are all tested main circuit with an AFCI acting characteristic and are connected, and described AFCI acting characteristic test main circuit is also connected to described acquisition module.Described electronic type test module comprises first and second signal generating module, low-voltage, high-current generation module, the rated voltage big current generation module that are connected with voltage, current waveform data storehouse respectively, described first signal generating module and described low-voltage, high-current generation model calling, described secondary signal generation module respectively with described low-voltage, high-current generation module and rated voltage big current generation model calling.

As shown in Figure 2, switch S 1, transformer T1 and test cable form high pressure carbonization circuit to AFCI acting characteristic test main circuit, and carry out high pressure carbonization to test cable, described transformer T1 secondary side output voltage is 15kV, and secondary side output short circuit current is 30mA; Tested AFCI, switch S 2, S3, S8 bulb L1, test cable composition carbonization decision circuitry, for judging whether carbonization completes; Tested AFCI, switch S 2, S4, S5, S6, S7, S8 first load Z1, the second load Z2, test cable composition hookup, for testing the electric arc recognition performance of AFCI; Whether tested AFCI, switch S 6, S7, the first load Z1, the second load Z2 form false tripping hookup, can extremely thread off when circuit normally works for detecting AFCI.Described first load is adjustable resistive load, described second load is that (false tripping testing standard regulation has 18 kinds of different loads, as Hoover, fluorescent light, capacitor motor, Switching Power Supply, electronic dimming lamp, electric hand drill, bi-metal, electric fan, air purifier etc. to the respective load specified in standard; Shielding load test standard regulation has 5 kinds of loads: Hoover, fluorescent light, capacitor motor, Switching Power Supply, electronic dimming lamp).

As shown in Figure 3, in shielding load test, position occurs arc fault has three kinds, i.e. main line fault, branch road 1 fault and branch road 2 fault to arc fault generation position view.

The principle of work of arc fault recognition capability analysis of experiments device of the present invention is as follows:

Principle of work and the waveform database principle of work of respectively AFCI acting characteristic being tested to three tests of being correlated with are described in detail.Described three tests are that carbonized path test, shielding load test and false tripping are tested, and when carrying out these three tests, electronic type test module does not work.

one, carbonized path test

Carbonized path test method is the mode by high pressure carbonization, and form carbonization passage at the insulating surface of test cable, and then produce fault electric arc, tested AFCI must line disconnection at the appointed time.Carbonized path test has three tests, i.e. series arc faults carbonized path test, the test of parallel arc fault carbonized path, carbonized path ignition test.Below respectively these three tests are described in detail.

1, series arc faults carbonized path test

(1) select the test of series arc faults carbonized path by human-computer interaction interface, test current is set, prepare test cable;

(2) AFCI acting characteristic test module powers on, and control module, illuminant module, driver module power on simultaneously, and switch S 1 ~ S8 is in off-state;

(3) host computer sends work order gauge tap sequential by communication module: Closing Switch S8, and two-way switch S6 beats to " right side " thus the first load Z1 is accessed main circuit; Switch S 1 closes, and transformer T1 carries out carbonization to test cable; Switch S 1 is opened, and switch S 2, S3 are closed, and electric current flows through switch S 8, AFCI, switch S 2, test cable, switch S 3, bulb L1, if bubble L1 is bright, then and carbonization success, if bulb L1 does not work, then carbonization failure, needs carbonization again;

(4) then switch S 3 is opened, switch S 4 closes in carbonization success, bulb L1 excises from main circuit, and the first load Z1 accesses main circuit, simultaneously, sampling module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer observing and controlling and analysis module;

(5) switch S 2, S4 open after the closed fixed time, and meanwhile, acquisition module quits work;

(6) data memory module obtains test waveform data from data read module, and Wave data is stored in voltage waveform data storehouse and current waveform data storehouse.Data process&analysis module obtains test waveform data from data read module, and carries out treatment and analyses to Wave data, determines the drop-away time of tested AFCI.If drop-away time is less than or equal to the drop-away time that standard specifies, then judge that tested AFCI is qualified; Otherwise, defective.

2, parallel arc fault carbonized path test

(1) select the test of parallel arc fault carbonized path by human-computer interaction interface, test current is set, prepare test cable;

(2) starting characteristics test loop, controls each switching sequence by control module: Closing Switch S8, and two-way switch S6 beats to " right side " thus the first load Z1 is accessed main circuit; Switch S 2 is opened, and switch S 1 closes, and transformer T1 carries out carbonization to test cable, and carbonization time is 10 seconds; Switch S 1 is opened, and switch S 2, S4 are closed, and test current flows through switch S 8, tested AFCI, switch S 2, test cable, switch S 4, switch S 6, first load Z1, and conduction time is 10 seconds; Sampling module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer;

(3) switching sequence of switch S 1, S2 repetition step (2), until there is following arbitrary situation: test period reaches 5 minutes, flame sensing module detects that cotton catches fire, dropout sensing module detects that tested AFCI threads off, 0.5 second internal fault current half wave number is more than or equal to 8, and within described 0.5 second, internal fault current half wave number is counted by data process&analysis module.

(4) the on/off switch state of tested AFCI and the data of flame sensing module are fed back to host computer by communication module by control module;

(5) data memory module obtains test waveform data from data read module, and Wave data is stored in voltage waveform data storehouse and current waveform data storehouse.Data process&analysis module obtains test waveform data from data read module, and treatment and analyses is carried out to Wave data, calculate 0.5 second internal fault current half wave number, when within 0.5 second, internal fault current half wave number reaches 8 time, if tested AFCI threads off, then judge that tested AFCI is qualified; If tested AFCI does not thread off, then judge that tested AFCI is defective.

3, carbonized path ignition test

(1) select carbonized path ignition test by human-computer interaction interface, and test current is set, prepare test cable;

(2) host computer sends work order, and control module controls each switch according to instruction: Closing Switch S8, and two-way switch S6 beats to " right side " thus the first load Z1 is accessed main circuit; Switch S 2 is opened, and switch S 1 closes, and transformer T1 carries out carbonization to test cable, and carbonization time is 10S; Switch S 1 is opened, and switch S 2, S4 are closed, and test current flows through switch S 8, AFCI, switch S 2, test cable, switch S 4, switch S 7, second load Z2.Conduction time is 10S, meanwhile, and sampling module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer;

(3), until there is following arbitrary situation: test period reaches 5 minutes, flame sensing module detects that cotton catches fire, dropout sensing module detects that tested AFCI threads off in the switching sequence of switch S 1, S2 repetition step (2);

(5) data memory module obtains test waveform data from data read module, and Wave data is stored in voltage waveform data storehouse and current waveform data storehouse.Data process&analysis module obtains test waveform data from data read module, and carries out treatment and analyses to Wave data, judges the dropout situation of AFCI, if before cotton catches fire, tested AFCI threads off, then AFCI is qualified; Otherwise, defective.

two, load test is shielded

Shielding load test method is identical with carbonized path test method, but test load is different with the position that arc fault occurs.Test load can be five kinds of shielding loads of UL1699 standard regulation, comprises Hoover, fluorescent light, capacitor motor, Switching Power Supply, electronic dimming lamp.The position that arc fault occurs as shown in Figure 3, comprises main line fault, branch road 1 fault and branch road 2 fault.

Shielding load test has two tests, namely shields the carbonized path ignition test of the test of load arc fault, band shielding load.

1, the test of load arc fault is shielded

The control method of shielding load arc fault test is substantially identical with series arc faults carbonized path experimental control method, but, need to select arc fault position and concrete shielding load to occur, as Hoover etc.Have different work schedules, first Closing Switch S8, according to the arc fault of test determination, the closing direction that two-way switch S6, S7 are selected in position occurs, if main line fault, then two-way switch S6, S7 beats to " right side "; If branch road 1 fault, then two-way switch S6 beats to " right side ", and two-way switch S7 beats to " left side "; If branch road 2 fault, then two-way switch S6 beats to " left side ", and two-way switch S7 beats to " right side ";

2, the carbonized path ignition test of band shielding load

The control method of the carbonized path ignition test of band shielding load is substantially identical with carbonized path ignition test control method, but, also to select different shielding loads, as Hoover etc.; First Closing Switch S8, two-way switch S7 beat to " right side " thus the second load Z2 are accessed main circuit; Switch S 2 is opened, and switch S 1, S5 are closed, and transformer T1 carries out carbonization to test cable, and the second load Z2 normally works simultaneously; Switch S 1, S5 open, switch S 2, S4 are closed, test current flows through switch S 8, AFCI, switch S 2, test cable, switch S 4, switch S 7, second load Z2, sampling module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer;

three, false tripping test

Whether false tripping test can thread off when circuit normally works extremely for detecting AFCI.False tripping test has 18 tests, and the principle of work of each test is identical, and load is different.

(1) false tripping test and concrete false tripping test load is selected, as electric hand drill by human-computer interaction interface; Host computer sends work order, control module closes according to instruction gauge tap S8, two-way switch S7 beat to " left side " by second load Z2 access main circuit (two-way switch S6 beats to " left side ", make the first load access main circuit when electric hand drill multi-load test, fluorescent light multi-load test, all the other test the first load not place in circuit), sampling module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer;

(2) after reaching regulation setting-up time, switch S 7, S8 open, and the on/off switch state of tested AFCI is fed back to host computer by communication module by control module;

(3) data memory module obtains test waveform data from data read module, and Wave data being stored in voltage waveform data storehouse and current waveform data storehouse, host computer judges the dropout situation of AFCI, if AFCI threads off, then judge that false tripping phenomenon occurs AFCI, AFCI is defective; If AFCI does not thread off, then AFCI is qualified.

four, waveform database

Waveform database data from a large amount of AFCI acting characteristic testing experiments, waveform database has wave form output function, can reduce repeatability test, greatly improve testing efficiency, waveform database has three kinds of mode of operations:

1, current waveform is selected by human-computer interaction interface from current waveform data storehouse, and Wave data is transferred to signal generating module 2, signal generating module 2 pairs of Wave datas carry out digital-to-analog conversion, form simulating signal, the output of signal generating module 2 directly accesses the AD sampling channel that AFCI Current Transformer Secondary side or AFCI carry detection module, thus provides fault electric arc current signal to AFCI;

2, voltage waveform is selected by human-computer interaction interface from voltage waveform data storehouse, and Wave data is transferred to signal generating module 1, signal generating module 1 pair of Wave data carries out digital-to-analog conversion, form simulating signal, signal generating module 1 exports the input connecing voltage amplification module, the output of voltage amplification module connects the input end of AFCI, for the internal electron circuit of AFCI and tripping mechanism are powered; Current waveform is selected from current waveform data storehouse again by human-computer interaction interface, and Wave data is transferred to signal generating module 2, signal generating module 2 pairs of Wave datas carry out digital-to-analog conversion, form simulating signal, signal generating module 2 exports the input connecing mutual conductance amplification module, the output of mutual conductance amplification module connects live wire input end and the fire wire output end of AFCI, and the current sensor for AFCI provides fault electric arc current signal.Mutual conductance amplification module has function voltage signal being converted to current signal.If tested AFCI is with creepage protection function, then can not by the electricity leakage sensor place in circuit of AFCI, otherwise earth leakage protection will be caused prior to the action of fault electric arc electrical apparatus release;

3, current waveform is selected by human-computer interaction interface from current waveform data storehouse, and Wave data is transferred to signal generating module 2, signal generating module 2 pairs of Wave datas carry out digital-to-analog conversion, form simulating signal, signal generating module 2 exports the input connecing power amplifier module, the output connecing power amplifier module connects the input end of AFCI, the output termination resistive load R1 of AFCI.Now, the input voltage of AFCI is nonsinusoidal waveform, and for utilizing the input voltage of AFCI carry out timing or judge that the AFCI of arc fault is perhaps inapplicable, the method is applicable to only using current signal as the AFCI of signal source.

1. series arc faults carbonized path test:

2. parallel arc fault carbonized path test:

3. carbonized path ignition test:

1. the test of load arc fault is shielded:

(1) by the load of human-computer interaction interface Selection experiment, arrange test current, prepare test cable;

2. the carbonized path ignition test of band shielding load:

Step S3: carry out false tripping test:

(1) host computer testing and analyzing module sends work order to control module, control the switching sequence of described AFCI acting characteristic test main circuit: control the first to the 8th switch opens, 8th switch closes, controlling the 7th switch makes the second load access main circuit (control the 6th switch, first load is tested in electric hand drill multi-load, access main circuit during fluorescent light multi-load test, all the other test the first load not place in circuit), acquisition module acquisition test voltage current waveform data, and Wave data is transferred to the data read module of host computer testing and analyzing module,

Be more than preferred embodiment of the present invention, all changes done according to technical solution of the present invention, when the function produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.

Claims

1. an arc fault recognition capability analysis of experiments device, it is characterized in that: comprise host computer observing and controlling and analysis module, slave computer, realize the communication module that host computer observing and controlling communicates with between analysis module and slave computer, described slave computer comprises AFCI acting characteristic test module for testing tested AFCI acting characteristic and electronic type test module; Also comprise an acquisition module, for receiving the arcing fault signal that described AFCI acting characteristic test module sends, realize the conditioning to arcing fault signal, collection, conversion and measurement, and being sent to described host computer observing and controlling and analysis module processes, then host computer observing and controlling and analysis module realize the exchanges data with AFCI acting characteristic test module by described communication module.

2. arc fault recognition capability analysis of experiments device according to claim 1, it is characterized in that: the data process&analysis module that described host computer observing and controlling and analysis module comprise a human-computer interaction module be connected with described communication module and be connected successively with this human-computer interaction module, data read module, data memory module and voltage waveform data storehouse, described data memory module is also connected with a current waveform data storehouse, described voltage, current waveform data storehouse is all connected to described human-computer interaction module, described voltage, current waveform data storehouse is also connected to described electronic type test module, described data read module is also connected with described acquisition module, described human-computer interaction module comprises a human-computer interaction interface.

3. arc fault recognition capability analysis of experiments device according to claim 2, it is characterized in that: described AFCI acting characteristic test module comprises the control module be connected with described communication module and acquisition module and the illuminant module be connected with this control module, flame sensing module, driver module and dropout sensing module, described illuminant module, flame sensing module, driver module and dropout sensing module are all tested main circuit with an AFCI acting characteristic and are connected, and described AFCI acting characteristic test main circuit is also connected to described acquisition module.

4. arc fault recognition capability analysis of experiments device according to claim 3, it is characterized in that: described AFCI acting characteristic test main circuit comprises tested AFCI, test cable, the first to the 8th switch, transformer, lamp, the first to the second load, and described 6th, the 7th switch is two-way switch; Described first switch, transformer and test cable composition high pressure carbonization circuit, carries out high pressure carbonization to test cable; Described tested AFCI, second, third and the 8th switch, lamp and test cable composition carbonization decision circuitry, for judging whether carbonization completes; Described tested AFCI, second, the 4th to the 8th switch, the first to the second load and test cable composition hookup, for testing the electric arc recognition performance of tested AFCI; Whether described tested AFCI, the 6th and the 7th switch, the first load and the second load composition false tripping hookup, can thread off when circuit normally works extremely for detecting tested AFCI.

5. arc fault recognition capability analysis of experiments device according to claim 4, it is characterized in that: described first load is adjustable resistive load, described second load is the respective load specified in standard, and the respective load specified in described standard comprises 18 kinds of loads of false tripping testing standard regulation and 5 kinds of loads of shielding load test standard regulation.

6. arc fault recognition capability analysis of experiments device according to claim 5, it is characterized in that: described electronic type test module comprises first and second signal generating module, low-voltage, high-current generation module, the rated voltage big current generation module that are connected with voltage, current waveform data storehouse respectively, described first signal generating module and described low-voltage, high-current generation model calling, described secondary signal generation module respectively with described low-voltage, high-current generation module and rated voltage big current generation model calling.

7., based on a test analysis method for arc fault recognition capability analysis of experiments device according to claim 6, it is characterized in that: comprise the steps,

1. series arc faults carbonized path test:

2. parallel arc fault carbonized path test:

(2) host computer observing and controlling and analysis module send work order to control module by communication module, control the switching sequence of described AFCI acting characteristic test main circuit: control the first to the 8th switch opens; 8th switch closes, and controls the 6th switch and makes the first load access main circuit; Second switch is opened, and the first switch closes, and transformer carries out carbonization to test cable, and carbonization time is 10 seconds; First switch opens, the second, the 4th switch closes, test current flows through the 8th switch, tested AFCI, second switch, test cable, the 4th switch, the 6th switch, the first load, conduction time is 10 seconds, acquisition module acquisition test voltage current waveform data simultaneously, and Wave data is transferred to the data read module of host computer observing and controlling and analysis module;

3. carbonized path ignition test:

1. the test of load arc fault is shielded:

2. the carbonized path ignition test of band shielding load:

Step S3: carry out false tripping test: