CN102288907A - Comprehensive condition testing method of circuit breaker - Google Patents
Comprehensive condition testing method of circuit breaker Download PDFInfo
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- CN102288907A CN102288907A CN2011101882922A CN201110188292A CN102288907A CN 102288907 A CN102288907 A CN 102288907A CN 2011101882922 A CN2011101882922 A CN 2011101882922A CN 201110188292 A CN201110188292 A CN 201110188292A CN 102288907 A CN102288907 A CN 102288907A
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Abstract
The invention discloses a comprehensive condition testing method of a circuit breaker, which belongs to the field of an electric power system condition testing method, fully reflects the working state of a high-voltage circuit breaker and comprises the step of testing current, time parameters, speed parameters, switching on resistance and input time of a switching on and off coil. The parameters are accurately measured by the method, a man-machine interaction interface is good, potential safety hazards are effectively reduced, and the method has an important significance in improving the power transmission continuity and efficiency of the electric power system, reducing equipment failure rate and improving the working reliability of the circuit breaker.
Description
Technical field
The invention belongs to the POWER SYSTEM STATE method of testing, particularly a kind of isolating switch comprehensive state method of testing.
Background technology
Along with electric system develops towards high voltage, high capacity direction, electric power operation department has proposed the requirement of exigence and Geng Gao to the operational reliability that guarantees primary cut-out.Therefore, primary cut-out is implemented repair based on condition of component, grasp its operation characteristic and variation tendency, can reduce too early or unnecessary power failure test and maintenance, reduce maintenance workload, reduce maintenance cost, improve the specific aim of maintenance, can significantly improve the reliability and the economy of Operation of Electric Systems.
The external comparison of carrying out in the research work aspect the high-voltage circuit-breaker status parameter testing early, developed some comparatively practical primary cut-out detecting and analysing systems, representative mainly contains: the TM1600/MA61 breaker operating characteristic detecting and analysing system of Sweden.This system is made of TM1600 isolating switch time response tester and MA61 stroke motion measuring and analysing meter two parts, the acting characteristic that can test various types of isolating switchs in industrial environments such as transformer station scene and switchgear plant; The common BCM type on off state monitoring system of developing of Britain Hathaway company and U.S. Edison Utilities Electric Co. can be carried out long-term continuous state monitoring by the switching devices important parameter, analyzes variation tendency, in time finds the fault omen.But the TM1600/MA61 tester costs an arm and a leg, and it combines by two testers, and integrated level is low, is not easy to operation; Though the continuous state monitoring for a long time of BCM type on off state monitoring system, because the connected mode of on-line testing and the limitation of response, measuring accuracy is not high, can only roughly reflect the variation tendency of mechanical property parameter, and price is higher.Two model testers are not energy measurement switching-on resistance and making time thereof all.
Domestic later to the research and development of breaker state test instrument, in traditional method of testing, the checking experiment personnel use testing equipments such as electrical secondmeter, synchronizing lamp, light oscillograph, hertz oscilltor and rotary drum knotmeter to test usually.But these equipment transportation difficulties, it is big not only to take on-the-spot area, wiring complexity during test, the data of reading and recording will be carried out artificial treatment and calculating, and the error of measuring is big, and the time of service work is long.But many in recent years colleges and universities, research institution and electric power unit of operation also develop the testing tool that can extract isolating switch fundamental characteristics parameter, and wherein representative is: the Yangzhou product win PSGKC-FPSGKC-F Testing Instrument for High Voltage Circuit-breaker that electric Science and Technology Ltd. produces; The QP02 1BD microcomputer type isolating switch tester that Shijiazhuang Han Di Electric Applicance Co., Ltd produces; The GYKC-4 high voltage switch dynamic characteristics tester that Wuhan permanent new state instrument Science and Technology Ltd. produces etc.China Patent No. " 200910067220.5 " name is called " a kind of breaker state test method " though can measure switching-on resistance and making time, but the measuring accuracy in the others parameter is low, and can't the measuring speed parameter, also only be an idea to the measurement of time parameter.
By above-mentioned tester is analyzed discovery: on the one hand, above equipment is mainly paid attention to a certain class single parameter of test both opens device, for example only be travel parameters or time parameter, the testing tool test parameter is few, every state index in the time of can not comprehensively reflecting the primary cut-out operation, and complex structure, complex operation, performance reliability and integrated level are low.And most of instrument wherein also can't the test both opens device switching-on resistance and making time thereof.Yet, make the comprehensive parameters that diagnosis with a high credibility just needs to be grasped the isolating switch running status to the fault of primary cut-out.The divide-shut brake coil current can reflect electromagnet itself and locking a door or valve and the working condition of chain contact in operating process of being controlled; The test of time parameter can reflect contact of breaker electrical wear degree, assessment isolating switch serviceable life and mode of operation; Speed parameter can directly reflect the mechanical fault situation of isolating switch and mechanical fault position roughly; The test of switching-on resistance and making time thereof exists under the situation of defective at switching-on resistance for prevention, and isolating switch continues to come into operation, and the blast that causes primary cut-out has positive effect.On the other hand, above equipment does not have the good man-machine interaction interface, and display interface is comparatively simple, can only the display process result, can not realize showing intuitively to waveform parameter etc.Judgement also is significant but current waveform, time response curve map etc. are for state.
In sum, it is few that relative breaker state verification instrument ubiquity both domestic and external monitoring parameter, and shortcomings such as real-time difference can't reflect the duty of primary cut-out comprehensively, and interface display is friendly inadequately, complicated operation.The present invention adopts more advanced processor to come the further comprehensive more test of multiparameter, the optimization system structure, simplify the operation, and simultaneously for satisfying the realization of primary cut-out information management automation system and the development trend of comprehensive state measuring technology, develop a kind of isolating switch comprehensive state testing tool of utility model, remedy the blank of comprehensive state test in the conventional electric power equipment failure prevention.
Summary of the invention
The object of the present invention is to provide a kind of isolating switch comprehensive state method of testing, it has reflected the duty of primary cut-out comprehensively, comprises the test to divide-shut brake coil current, time parameter, speed parameter, switching-on resistance and making time.
Technical scheme of the present invention is as follows:
A kind of isolating switch comprehensive state method of testing, form by following steps:
(A) software environment based on LINUX operating system and Qt/Embedded makes up;
(B) to the collection and the measurement of divide-shut brake coil current;
At the coil-end serial connection current sensor of isolating switch, the output of current sensor is converted to coil current signal through A/D again through behind the modulate circuit; Utilize Mallet wavelet transform treatment coil current signal, extract the current characteristic parameter;
(C) to the collection and the measurement of time parameter;
The contact end of isolating switch is connected with the switching value input end of tester, detects the time parameter by the port detection circuit;
(D) to the collection and the measurement of speed parameter;
The moving contact of displacement transducer and isolating switch is connected and fixed, and the output of displacement transducer directly is converted to the journey time signal through A/D; Utilize the Digital Signal Processing of FIR filtering technique from stroke-time waveform, to extract speed parameter;
(E) to the measurement of switching-on resistance and making time;
Connect measuring resistance at the isolating switch input end, on measuring resistance, be added with direct voltage source, measuring resistance connects signal conditioner, and testing standard resistance draws the resistance and the making time of switching-on resistance at the circuit-breaker switching on-off magnitude of voltage of different one of four states time periods by master cpu.
Description of drawings Fig. 1 is the whole software architecture diagram of tester;
Fig. 2 is the Hall current sensor wiring diagram;
Fig. 3 is a divide-shut brake coil current signal Acquisition Circuit schematic diagram;
Fig. 4 is typical divide-shut brake coil current characteristic waveforms;
Fig. 5 is a port detection circuit circuit diagram;
Fig. 6 is the solid-state relay wiring diagram;
Fig. 7 is the switching-on resistance process chart;
Fig. 8 is switching-on resistance making time and measurement scheme figure;
Fig. 9 is a measuring resistance change in voltage curve map;
Figure 10 is an one-piece construction block diagram of the present invention.
The invention has the advantages that: 1, by studying the method for testing of domestic and international already used high-voltage circuit-breaker switching on-off parameter at present, take all factors into consideration travelling speed and the data processing speed and the good man-machine interaction attractive in appearance of tester, the present invention has designed based on the signal acquisition process of arm processor and viewing hardware circuit, use the peripheral circuit of various reliable anti-electromagnetic interference (EMI), the software aspect adopts flush type LINUX as operating system, utilizes Qt/Embedded exploitation gui interface; 2, the present invention adopts the Digital Signal Processing based on the FIR filtering technique to extract speed parameter from stroke-time waveform, in electric system, the primary cut-out stroke signal of collection in worksite inevitably contains HF noise signal, only carry out denoising, could extract the useful feature information in the original signal effectively.The present invention has drawn the FIR filtering technique of using based on the windowing method and can be good at removing the high frequency noise interference by the multiple means of filtering of contrast, realizes the accurate extraction of speed parameter; 3, the present invention adopts improved Mallet wavelet transform disposal route that coil current signal analysis is extracted main time parameter, because the on-the-spot electromagnetic environment of primary cut-out is comparatively abominable, the current signal waveform of coil often contains the high frequency noise that much produces because of interference, this is very unfavorable to extract useful information from waveform, take into account the transient characteristic of high-voltage circuit-breaker switching on-off coil current signal, the present invention compares through the checking of multiple disposal route, draw wavelet transformation theory and not only can well remove high frequency noise, and the characteristic parameter of the current signal of coil behind wavelet transformation is obvious especially, can extract exactly; 4, the present invention obtains switching-on resistance resistance and making time by testing the magnitude of voltage of a measuring resistance in each state time; 5, apparatus of the present invention have been equipped with high capacity flash, SD card and 8 inches LCD screen simultaneously, can realize that storage, data mobile to mass data duplicated and the demonstration of data, large-sized color liquid crystal can be realized the display analysis directly perceived to test curve, also has touch screen function in addition on the liquid crystal and can realize good man-machine interaction.This device has also extended out keyboard interface and mini-printer, and test result can be consulted at any time to print and be analyzed, and this portability and reliability for the power equipment test provides strong assurance, meets important content and developing direction that present power equipment is optimized state verification; 6, the present invention adopts integrated design concept, the key state information of isolating switchs such as contacts status, coil current and switching-on resistance when the sampling processing isolating switch moves respectively, collection detects with intelligent diagnostics integrated, the state parameter that has comprehensively reflected primary cut-out is for the inspection operation of isolating switch provides reasonable proposal; 7, to possess antijamming capability simultaneously strong in the present invention, satisfy harsh industrial level B standard, wiring simultaneously is simple, easy to operate, the level of integrated system height has the data printing function, make things convenient for the maintainer that test result is compared and analyzes, hold isolating switch changes of properties trend,, meet important content and developing direction that present power equipment is optimized state verification so that in time propose maintenance program; 8, the present invention can reduce a lot of loaded down with trivial details maintenance testing tools, minimizing equipment overlapping investment expense, save unnecessary expenses, the expense that significantly reduces the isolating switch maintenance and detect, consider all tens isolating switchs of each power transformation, if this equipment of widespread use, annual maintenance and testing cost of saving is appreciable, indirect benefit is to have remedied the blank testing that homemade isolating switch detector can't be realized switching-on resistance, reduced potential safety hazard, to improving the continuity and the high efficiency of electric system transmission of electricity, reduce equipment failure rate, the reliability that improves isolating switch work has significance.
The invention will be further described below in conjunction with accompanying drawing for embodiment.
A kind of isolating switch comprehensive state method of testing, form by following steps:
(A) software environment based on LINUX operating system and Qt/Embedded makes up;
As shown in Figure 1, system's operation is in proper order: Bootloader begins when powering in system to carry out, initiating hardware equipment, be ready to software environment, last call operation system kernel, operating system is positioned on the hardware, its main effect is memory management, file management, equipment control, provides procotol.The main compounding practice of root file system system realizes file management facilities, and some system library functions are provided, call for the user, and as the Qt/Embedded storehouse, the C function library, application program is positioned at the superiors, is that the user writes the realization specific function;
The development process of whole software is as follows: at first will customize well, compiled Boot loader and operating system transplantation are to the hardware circuit that designs; The driver that in operating system, adds hardware then, as LCD, network interface etc., the user can not direct control hardware, need call the relevant hardware driver by operating system and could control hardware; Afterwards, the Qt/Embedded development environment is installed on operating system; Carry out the exploitation of application program at last;
The present invention mainly comprises following three aspects aspect application development:
1) initialization: in the QT application program, at first be to create the QApplication object in main.cpp, the QApplication class is responsible for the control stream and main setting of graphical user interface application program;
2) create assembly: for two class objects have been created in the selection that realizes function and the demonstration of detecting information, be respectively QPainting and QMainForm class object, wherein the QMainForm class is inherited from the QwidgetStack class, be used to realize the page-turning function of window, and the QPainting class is inherited from the QWidget class, is used to realize the demonstration of Wave data;
3) the event loop body of event handling: event handler procedure: QApplication (main event loop) picks up native window system event or other incident from event queue, be translated into QEvent(), and give QObject::event(), give QWidget::event(at last) respectively to event handling, as KeyPressEvent(), the generation of incident is except directly coming from the window system at place, can also utilize the member function of QApplication class to send incident, as: sendEvent();
(B) to the collection and the measurement of divide-shut brake coil current;
As shown in Figure 2, the present invention adopts closed loop Hall current sensor CSM003A, the DC simulation signal of breaker closing coil
I 1CSM003A is transformed into current signal through the closed loop Hall current sensor
I 2,
I 2Through build-out resistor
RConvert the voltage signal that the AD modular converter can receive to
U 0, among the figure
R 1With
D 1Constitute the voltage-limiting protection link together, wherein
R 1Be current-limiting resistance, the electric current that prevents the sensor output terminal is excessive and damage power supply unit, resistance R, R
1And diode D
1Constituted modulate circuit;
As shown in Figure 3, sub-gate circuit is composed in series by separating brake relay and switching winding by the closed loop Hall current sensor, closing circuit is composed in series by closing relay and closing coil by the closed loop Hall current sensor, the closed loop Hall current sensor links to each other with direct current 220V, after system sends the divide-shut brake order, the adhesive of primary processor control divide-shut brake relay, form the divide-shut brake test loop, the isolating switch action, the AD modular converter carries out the current signal collection, and be saved in the SD card, to finish the collection of divide-shut brake coil current signal;
Fig. 4 is typical divide-shut brake coil current characteristic waveforms, and this waveform can be divided into following five stages according to the motion of iron core:
1) Phase I, t0 to t1.Coil is switched on constantly at t0, to t1 moment setting in motion unshakable in one's determination;
2) Phase, t1 to t2.Motion unshakable in one's determination, electric current descends.T2 is the valley point of Control current, represents the load that has touched actuating machinery unshakable in one's determination and noticeable deceleration or stop motion;
3) Phase I, t2 to t3.Stop motion unshakable in one's determination, electric current are index again and rise;
4) Phase IV, t3 to t4.This stage is the continuity of Phase I, and electric current reaches approximate stable state;
5) stage V, t4 to t5.Electric current cut-offs the stage.This stage auxiliary switch disjunction;
Utilize Mallet wavelet transform treatment coil current signal, it is as follows to extract current characteristic parameter concrete grammar:
A) will contain noise signal and carry out wavelet decomposition: select suitable small echo and wavelet decomposition number of plies j, it is decomposed to the j layer, obtain corresponding coefficient of wavelet decomposition, the wavelet decomposition algorithm in the Mallat algorithm is:
K=0 wherein, 1,2 ..., n-1, n represent the number of burst, j is the number of plies of wavelet decomposition, and during j=0,
Be the sample sequence of original signal,
Be the low frequency component after decomposing,
Be the high fdrequency component after decomposing,
Be the scale coefficient of multiresolution analysis, low-pass filter coefficients just,
Be the wavelet coefficient of multiresolution analysis, Hi-pass filter coefficient just;
B) carry out threshold process to decomposing resulting wavelet coefficient: construct following threshold function table,
(2.3)
In the formula
, wherein,
Because
So, have
C) carry out wavelet inverse transformation: the wavelet coefficient that threshold process is crossed is reconstructed by restructing algorithm, and the wavelet reconstruction algorithm in the Mallat algorithm is:
D) determine parametric t 2: the coil current signal after the denoising is carried out wavelet decomposition to layer 6, preserve the 3rd layer the high frequency coefficient and the low frequency coefficient of layer 6, calculate maximal value and this maximal value sequence number index (according to time order and function) in all low frequency coefficient of this layer of layer 6 low frequency coefficient, [index-1, index] the pairing time interval, be exactly that low frequency signal changes the most significant time period, [index-1, index] be converted to the 3rd floor height frequently the pairing interval of coefficient should for [(index-1) * 26-3, index * 26-3], calculate maximal value and the sequence number index2 of this maximal value in all high frequency coefficient of this layer in this interval of the 3rd floor height frequency coefficient, calculating sequence number is the pairing time point of high frequency coefficient of index2, this time point is the t2 moment in the family curve shown in Figure 4, and computing formula is:
(2.6)
R is a sampling rate in the formula;
E) determine parametric t 1: be carved into t2 from the outset in this time period constantly, t1 is the moment of setting in motion unshakable in one's determination constantly, and this moment, the current value maximum as long as find out the maximal value of electric current in this time period, can be determined parametric t 1;
F) determine parametric t 3: be carved into t4 during from t2 this time period constantly, t3 constantly after electric current will reach approximate stable state, from t2 constantly, find out current value and be parametric t 3 near the moment of this steady-state value for the first time; (C) to the collection and the measurement of time parameter;
As shown in Figure 5; the normally closed auxiliary contact of primary cut-out is serially connected in the input circuit; T type RC network constitutes low-pass filter; be used for filtering the high frequency interference in the loop; resistance R 1 also has the effect of current limliting; make the electric current that enters light emitting diode be limited in a milliampere level; diode D1; D2 plays protection photoelectrical coupler U1; photoelectrical coupler U1 realizes the isolation fully between on-the-spot switching value and the cpu bus; remove the electrical link on public ground between them; distributed capacitance is few between the photoelectrical coupler U1 input and output; and insulation resistance is very big; so isolation effect is relatively good, the on-the-spot electromagnetic interference (EMI) of surveying is difficult to arrive on the cpu bus, and the principle of work of port detection circuit is as follows:
Suppose that primary cut-out is in gate-dividing state, then its normally closed auxiliary contact closure is input to optocoupler after the+12V process RC network, lumination of light emitting diode in the optocoupler, and the phototriode conducting, output terminal INPUT output low level " 0 " is to master cpu; If primary cut-out is in "on" position, its normally closed auxiliary contact disconnects, and it is not luminous that light emitting diode does not have electricity, and phototriode ends, and output terminal INPUT output high level " 1 " arrives master cpu, thereby has finished the collection of primary cut-out contact time signal; By the duration of monitoring level, obtain the time parameter of on/off switch;
Port is surveyed the time signal that collects and is directly imported master cpu, master cpu sends the on/off switch control signal, after sending reclosing command, dc solid-state relay SSR-DD connects, model can adopt HHG1-0/032F-20, because 220V output is to connect the closing coil of primary cut-out, this moment, feed motion began; After sending the separating brake instruction, dc solid-state relay SSR-DD connects, because 220V output is to connect the switching winding of primary cut-out, so separating brake action beginning this moment;
(D) to the collection and the measurement of speed parameter;
The moving contact of displacement transducer and isolating switch is connected and fixed, and the output of displacement transducer directly is converted to the journey time signal through A/D, and displacement transducer is the commercially available prod, can adopt the LWH 250 of German NOVO TECHNIK company;
The present invention's utilization can be good at removing the high frequency noise interference based on the FIR filtering technique of windowing method, realizes the accurate extraction of speed parameter, and concrete extracting method is as follows:
The frequency characteristic of ideal low-pass filter is
, suppose
, phase-frequency characteristic
, then the unit sample respo of this wave filter is
?(3.1)
?(3.2)
In the formula,
It is normalized frequency
,
Be sampling frequency,
Choose by transport function
Lowest mean square approach
Decide,
If
Be even function, know by sampling thheorem,
, then
?(
)，(3.4)
And
,
Can access after (3.2) blocked, introduce time-delay:
Wherein:
,
...,
,
...,
,
,
In the present invention, the AD sample frequency is
=10kHz designs one 9 rank low-pass filter, and cutoff frequency is got
=1kHz, window function
For:
Then have
, (3.7)
Wherein,
, then
，(3.8)
Can obtain:
；
；
；
；
；
Can obtain parameter input and output pass according to convolution equation is:
N=8 wherein,
Through following formula handle time-the stroke waveform is again according to following steps extraction rate parameter:
1) the combined floodgate auxiliary contact is connected the firm closing speed of average velocity conduct in the l0ms of back,
2) the separating brake auxiliary contact is connected the firm opening velocity of average velocity conduct in the l0ms of back,
3) in the middle of the making process average velocity of 80% stroke as combined floodgate average velocity,
4) average velocity of middle 80% stroke of separating brake process is as separating brake average velocity;
(E) to the measurement of switching-on resistance and making time;
Connect measuring resistance at the isolating switch input end, on measuring resistance, be added with direct voltage source, measuring resistance connects signal conditioner, and testing standard resistance draws the resistance and the making time of switching-on resistance at the circuit-breaker switching on-off magnitude of voltage of different one of four states time periods by master cpu.Concrete measuring method is as follows:
Fig. 7 is a making process figure who has the isolating switch of shunt capacitance and switching-on resistance, wherein
K 1Be the isolating switch main contact,
K 2Be the auxiliary contact (connecting) of isolating switch with switching-on resistance,
R 1Be switching-on resistance,
C 1Be the fracture shunt capacitance.The process of closing a floodgate is as follows: (a) is original state among Fig. 7, isolating switch is in the separating brake position, the main contact of isolating switch and auxiliary contact are all at open position, when (a) position, isolating switch is received about 80 ms in order back that close a floodgate, and the state of isolating switch arrives (b) state, and the main contact of isolating switch is at open position, the auxiliary contact closure, this moment, switching-on resistance came into operation, about 10 ms behind arrival (b) state, and isolating switch enters (c) state, the main contact of isolating switch and auxiliary contact are closed simultaneously, this moment, switching-on resistance began to withdraw from use, and isolating switch enters (d) state, main contact closure immediately behind arrival (c) state, auxiliary contact disconnects, and breaker closing finishes.
Each element of isolating switch all is in the airtight container, only just may open when overhaul, can't dissect at ordinary times.And no matter isolating switch is in gate-dividing state or "on" position, the contact of switching-on resistance all is at open position, but about the line time of its measurement about 10ms that only (b) state is kept among Fig. 7 in making process, it is impossible at all using wheatstone bridge or multimeter to carry out reading in the so short time.
Special circumstances in view of switching-on resistance and making time measurement, the present invention has adopted the method for switching-on resistance dynamic test, adopt advanced computer digit sampling processing technology, for the primary cut-out preventive trial provides easy, safe and effective method of testing.
The testing scheme wiring as shown in Figure 8, wherein
R 2Be measuring resistance, E is a direct voltage source.(a)～(d) according to Fig. 7, list following relational expression:
When the combined floodgate switch contact is in Fig. 7 (a),
When
The time, get from formula (4.1)
When the combined floodgate switch contact is in Fig. 7 (b),
From
Can derive:
(4.4)
T?=?
t 1?-?
t 0 (4.5)
When
The time,
When being in Fig. 7 (c) and (d) time,
As seen, among Fig. 9
The change in voltage curve map can provide 3 parameters in (4.4) formula to us
,
EWith
tAnd all the other parameters in this formula
,
CBe known parameters, so we just can obtain switching-on resistance by separating (4.4) formula
R 1Resistance, can obtain switching-on resistance by separating (4.5)
R 1Making time.
As shown in Figure 10, as master cpu, it accepts the instruction from the user with ARM chip S3C2440 in the present invention, receives the data that A/D transmits, and the work of each peripheral components is coordinated in the operation of handling procedure simultaneously.The parameter amount that the test acquisition module of being made up of sensor and modulate circuit is used for each need be tested is gathered and is changed.And 12 the A/D modular converters external with the ARM chip become digital signal with the analog signal conversion from the function sensor that receives, and realize the digital conversion to voltage, current signal.Signal through the AD conversion is transmitted to CPU, carries out after algorithm correction, compensation, the characteristic parameter extraction result being stored among SD card or the FLASH.Liquid crystal has adopted the low temperature liquid crystal of 800*640, can work in-40 ℃, and the real-time demonstration of various data is provided, and abundant man-machine interaction menu is provided.SD card in the tester and FLASH are used for the storage to test data, can realize the storage to mass data.Tester also has the convenient and compunication of serial ports in addition, and the physical channel that the 10M Ethernet interface of tester provides Ethernet to insert for system, by this interface, system can be with the speed access network based on ethernet of 10M.
After the tester energising, at first be that Bootloader begins to carry out when powering in system, initiating hardware equipment, be ready to software environment, last call operation system kernel; Then os starting is realized the management of internal memory, file, loading equipemtn drive as: the driving of keyboard, liquid crystal, printer and other operating equipment; Then root file system starts and realizes that file management provides the built-in function support, and application program also starts, and the user selects the test operation that need carry out; When the user has carried out test setting, CPU reads the device numbering that need test (to the inquiry of equipment, the newly-built operational administrative that waits is finished in opening file), call AD then and gather driving, control each sensor relay adhesive, receive the acquisition that central processing system sends to the AD acquisition system, control isolating switch then and carry out closing operation, after timing acquiring finishes, the AD acquisition system is transmitted data to central processing system, carry out data processing by central processing system then, and the data after will handling are saved in flash or the SD card, call switching current then, contacts status, squiggle and test datas such as switching-on resistance; Sub-switching operation is as the same.
The accuracy standard that the present invention can reach is as follows:
Reference time measurement: 0ms～300ms; Resolution: 0.1ms;
Current measuring range: 0mA～3000mA; Resolution: 5mA;
Resistance measurement scope: 0～500; Resolution: 1 Ω;
Voltage measurement scope: 0V～220V; Resolution: 0.5V;
Contact travel scope: 0mm～250mm; Resolution: 1mm;
Contact velocity range: 0mm/s～9000mm/s; Resolution: 10mm/s.
Claims (5)
1. isolating switch comprehensive state method of testing is characterized in that: forms by following steps,
(A) software environment based on LINUX operating system and Qt/Embedded makes up;
(B) to the collection and the measurement of divide-shut brake coil current;
(C) to the collection and the measurement of time parameter;
(D) to the collection and the measurement of speed parameter;
(E) to the measurement of switching-on resistance and making time.
2. a kind of isolating switch comprehensive state method of testing as claimed in claim 1, it is characterized in that: step (B) adopts the coil-end serial connection current sensor of isolating switch, the output of current sensor is converted to coil current signal through A/D again through behind the modulate circuit, and utilize Mallet wavelet transform treatment coil current signal, extract the current characteristic parameter.
3. a kind of isolating switch comprehensive state method of testing as claimed in claim 1 is characterized in that: step (C) adopts the contact end with isolating switch to be connected with the switching value input end of tester, detects the time parameter by the port detection circuit.
4. a kind of isolating switch comprehensive state method of testing as claimed in claim 1, it is characterized in that: step (D) adopts the moving contact with displacement transducer and isolating switch to be connected and fixed, the output of displacement transducer directly is converted to the journey time signal through A/D, and utilizes the Digital Signal Processing of FIR filtering technique to extract speed parameter from stroke-time waveform.
5. a kind of isolating switch comprehensive state method of testing as claimed in claim 2 is characterized in that: Mallet wavelet transform treatment coil current signal, and the step of extracting the current characteristic parameter is as follows:
A) will contain noise signal and carry out wavelet decomposition;
B) carry out threshold process to decomposing resulting wavelet coefficient;
C) carry out wavelet inverse transformation;
D) determine parametric t 2;
E) determine parametric t 1;
F) determine parametric t 3.
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389416A (en) * | 2012-05-10 | 2013-11-13 | 欧米克朗电子仪器有限公司 | Measurement of a resistance of a switch contact of an electrical circuit breaker |
| CN104198934A (en) * | 2014-09-18 | 2014-12-10 | 国家电网公司 | Online monitoring method and equipment for high-voltage circuit breaker |
| CN104268393A (en) * | 2014-09-24 | 2015-01-07 | 广西电网公司电力科学研究院 | Importance degree assessment method of parts of high-voltage circuit breaker |
| CN104360261A (en) * | 2014-10-29 | 2015-02-18 | 国家电网公司 | Method for coil current curve reconstruction of circuit breaker operating mechanisms on basis of feature points |
| CN104777420A (en) * | 2015-04-07 | 2015-07-15 | 石家庄汉迪电子仪器有限公司 | High-voltage switch contact testing system and testing method thereof |
| CN105589030A (en) * | 2015-11-25 | 2016-05-18 | 国网辽宁省电力有限公司锦州供电公司 | System and method of testing high-voltage circuit breaker |
| CN105891705A (en) * | 2016-03-15 | 2016-08-24 | 国家电网公司 | Detection system of a circuit breaker |
| CN106199414A (en) * | 2016-06-29 | 2016-12-07 | 温州大学 | The self-adaptive identification method of impedance loop in breaker protective property test process |
| CN107643482A (en) * | 2017-07-25 | 2018-01-30 | 陕西斯瑞新材料股份有限公司 | A kind of on off state judgment models based on coil current waveform |
| CN107748325A (en) * | 2017-10-19 | 2018-03-02 | 国网山西省电力公司检修分公司 | Super breaker in extra high voltage switching-on resistance tester |
| CN107966651A (en) * | 2016-10-20 | 2018-04-27 | 国网新疆电力公司疆南供电公司 | A kind of DC micro breaker operating characteristic detection device |
| CN108072822A (en) * | 2016-11-07 | 2018-05-25 | 株洲中车时代电气股份有限公司 | A kind of transmission system main circuit contact device card divides method for diagnosing faults |
| CN109254245A (en) * | 2018-11-07 | 2019-01-22 | 紫光测控有限公司 | A kind of short circuit of relay circuit and open detection circuit |
| CN109298329A (en) * | 2018-11-23 | 2019-02-01 | 广东电网有限责任公司 | A kind of circuit-breaker switching on-off test method |
| CN110646728A (en) * | 2019-09-27 | 2020-01-03 | 国网冀北电力有限公司检修分公司 | Breaker fault analysis method and device based on moving speed of breaker contact |
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| CN113067410A (en) * | 2021-03-29 | 2021-07-02 | 山东山大电力技术股份有限公司 | Online diagnosis and analysis system and method for alternating current filter circuit breaker |
| CN113410814A (en) * | 2021-06-09 | 2021-09-17 | 西安交通大学 | Mechanical direct current breaker state evaluation method, system and medium |
| CN115792594A (en) * | 2022-11-29 | 2023-03-14 | 哈尔滨工业大学 | Soft magnetic type selection method for improving dynamic characteristics of sealed electromagnetic relay |
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| US9322880B2 (en) | 2012-05-10 | 2016-04-26 | Omicron Electronics Gmbh | Measurement of a resistance of a switching contact of an electrical circuit breaker |
| CN103389416A (en) * | 2012-05-10 | 2013-11-13 | 欧米克朗电子仪器有限公司 | Measurement of a resistance of a switch contact of an electrical circuit breaker |
| CN103389416B (en) * | 2012-05-10 | 2016-07-06 | 欧米克朗电子仪器有限公司 | The resistance measurement of the switch contact of circuit-breaker |
| CN104198934A (en) * | 2014-09-18 | 2014-12-10 | 国家电网公司 | Online monitoring method and equipment for high-voltage circuit breaker |
| CN104268393B (en) * | 2014-09-24 | 2017-06-06 | 广西电网公司电力科学研究院 | A kind of primary cut-out Degrees of Importance of Components appraisal procedure |
| CN104268393A (en) * | 2014-09-24 | 2015-01-07 | 广西电网公司电力科学研究院 | Importance degree assessment method of parts of high-voltage circuit breaker |
| CN104360261A (en) * | 2014-10-29 | 2015-02-18 | 国家电网公司 | Method for coil current curve reconstruction of circuit breaker operating mechanisms on basis of feature points |
| CN104777420A (en) * | 2015-04-07 | 2015-07-15 | 石家庄汉迪电子仪器有限公司 | High-voltage switch contact testing system and testing method thereof |
| CN105589030A (en) * | 2015-11-25 | 2016-05-18 | 国网辽宁省电力有限公司锦州供电公司 | System and method of testing high-voltage circuit breaker |
| CN105891705A (en) * | 2016-03-15 | 2016-08-24 | 国家电网公司 | Detection system of a circuit breaker |
| CN106199414A (en) * | 2016-06-29 | 2016-12-07 | 温州大学 | The self-adaptive identification method of impedance loop in breaker protective property test process |
| CN106199414B (en) * | 2016-06-29 | 2019-01-11 | 温州大学 | The self-adaptive identification method of impedance loop in breaker protective property test process |
| CN107966651A (en) * | 2016-10-20 | 2018-04-27 | 国网新疆电力公司疆南供电公司 | A kind of DC micro breaker operating characteristic detection device |
| CN108072822A (en) * | 2016-11-07 | 2018-05-25 | 株洲中车时代电气股份有限公司 | A kind of transmission system main circuit contact device card divides method for diagnosing faults |
| CN107643482A (en) * | 2017-07-25 | 2018-01-30 | 陕西斯瑞新材料股份有限公司 | A kind of on off state judgment models based on coil current waveform |
| CN107748325A (en) * | 2017-10-19 | 2018-03-02 | 国网山西省电力公司检修分公司 | Super breaker in extra high voltage switching-on resistance tester |
| CN109254245A (en) * | 2018-11-07 | 2019-01-22 | 紫光测控有限公司 | A kind of short circuit of relay circuit and open detection circuit |
| CN109254245B (en) * | 2018-11-07 | 2020-12-01 | 紫光测控有限公司 | Relay loop short circuit and open circuit detection circuit |
| CN109298329A (en) * | 2018-11-23 | 2019-02-01 | 广东电网有限责任公司 | A kind of circuit-breaker switching on-off test method |
| CN110646728A (en) * | 2019-09-27 | 2020-01-03 | 国网冀北电力有限公司检修分公司 | Breaker fault analysis method and device based on moving speed of breaker contact |
| CN111751621A (en) * | 2020-05-14 | 2020-10-09 | 广西电网有限责任公司电力科学研究院 | Detection method for secondary circuit of high-voltage circuit breaker |
| CN111751620A (en) * | 2020-05-14 | 2020-10-09 | 广西电网有限责任公司电力科学研究院 | Self-adaptive detection method for primary circuit of circuit breaker |
| CN111751620B (en) * | 2020-05-14 | 2022-08-16 | 广西电网有限责任公司电力科学研究院 | Self-adaptive detection method for primary circuit of circuit breaker |
| CN112858902A (en) * | 2021-02-02 | 2021-05-28 | 南方电网数字电网研究院有限公司 | Miniature circuit breaker monitoring method and device, computer equipment and storage medium |
| CN113067410A (en) * | 2021-03-29 | 2021-07-02 | 山东山大电力技术股份有限公司 | Online diagnosis and analysis system and method for alternating current filter circuit breaker |
| CN113410814A (en) * | 2021-06-09 | 2021-09-17 | 西安交通大学 | Mechanical direct current breaker state evaluation method, system and medium |
| CN113410814B (en) * | 2021-06-09 | 2022-08-16 | 西安交通大学 | Mechanical direct current breaker state evaluation method, system and medium |
| CN115792594A (en) * | 2022-11-29 | 2023-03-14 | 哈尔滨工业大学 | Soft magnetic type selection method for improving dynamic characteristics of sealed electromagnetic relay |
| CN115792594B (en) * | 2022-11-29 | 2024-03-29 | 哈尔滨工业大学 | Soft magnetic separation method for improving dynamic characteristics of sealed electromagnetic relay |
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