CN101833062A - Circuit checking method based on circuit checking instrument - Google Patents
Circuit checking method based on circuit checking instrument Download PDFInfo
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- CN101833062A CN101833062A CN 201010151400 CN201010151400A CN101833062A CN 101833062 A CN101833062 A CN 101833062A CN 201010151400 CN201010151400 CN 201010151400 CN 201010151400 A CN201010151400 A CN 201010151400A CN 101833062 A CN101833062 A CN 101833062A
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Abstract
The invention relates to a circuit checking method based on circuit checking instrument. Main implementation parts are composed of two parts of host and terminal of the circuit checking instrument, an embedded processing system part is the core of the entire method. The method includes: communication processing, adaptive program control amplification, time domain and frequency domain analysis and adaptive characteristic power signal control; wherein the communication processing adopts current loop test method, signal is collected and then is subject to adaptive program control amplification processing, the time domain and frequency domain analysis is carried out, and the adaptive characteristic power signal control is carried out. The invention has simple and convenient use and accurate result and is applicable to large-scale application.
Description
Technical field
The present invention relates to the circuit safety technology, relate in particular to the electric circuit inspection technology of electric line checking instrument.
Background technology
In platform district generaI investigation, make each affiliated user clear and be for radio area the most difficult, workload is maximum.Reason is that low-voltage circuit moves for many years, the fast development in city, and it is higher that the user increases and decreases the migration frequency, and common transformer often changes; Desk-top, van-type becomes, and cable provided underground, line alignment are intricate, confused; From the substation transformer to the user side, middle through branch and circuit secretly bury wiring, the user is difficult to distinguish the phase sequence attribute of supply line sometimes; Imperfect and the disappearance of the data that platform district line management personnel's reasons such as change also cause even making to drop into drops into manpower and materials in a large number in the past, also can not get due effect in distribution line and branch's examination process thereof.
Summary of the invention
Technical matters solved by the invention is to provide a kind of circuit checking method based on circuit checking instrument, to solve the shortcoming in the above-mentioned background technology.
Technical matters solved by the invention realizes by the following technical solutions:
Circuit checking method based on circuit checking instrument, the main parts of carrying out are made up of main frame and two parts of terminal of circuit checking instrument, secondary current signal after utilizing split-core type current mutual inductor with conversion is sent to the instrument operational amplifier, and amplifier gain is set as required by CPU.The output of amplifier connects 24 A/D samplings, and A/D sampling back data are sent to CPU, by CPU sampled data are carried out corresponding analysis and calculate.The result mails to terminal by serial ports and radio receiving transmitting module, and terminal MCU receives the instruction that main frame is sent, and the controlling features generator produces the characteristic current signal.Characteristic signal drives IGBT and produces the auxiliary detection current signal for the main frame detection on pull-up resistor by isolating.Terminal MCU receives the analysis result of main frame and is shown to operating personnel by communication part.
Embedded processing systems of the present invention partly is the core of entire method, and it has comprised: communication process, the program control amplification of self-adaptation, time-domain and frequency-domain analysis, the control of self-adaptive features power signal.Communication process adopts the current return method of testing, use the direct current pressure decline method and measure the contact resistance and the loop resistance of high-voltage switch gear, according to importing the self-adaptation programmable amplifier that changes, amplitude according to input signal, by digital circuit and mimic channel, controlling the gain of amplifying circuit by CPU by certain algorithm, thereby obtain basicly stable analog quantity output, is digital Auto Gain control; After using digital comb filter that harmonic component is suppressed in the time-domain analysis process, the MLE signal parameter algorithm for estimating of use in the signal estimation technique, utilize the digital filter parameters to be provided with and extract useful characteristic signal, time series after time-domain analysis is handled arrives frequency domain by Fast Fourier Transform (FFT), its watermark feature is manifested, in conjunction with fuzzy recognition technology, come further recognition feature signal; Under self-adaptive features power signal control action, the feature power signal also must change with the size variation of electric current, makes main frame and terminal must adjust the characteristic signal power of terminal according to the line current size in practical work process in good time.
Beneficial effect:
The present invention uses simply, convenience, when reducing the manpower consumption significantly, significantly improve distribution line and check the accuracy of data, for reducing line loss, improving power supply reliability foundation accurately is provided, remedied technical and market on still belong to blankly, market potential is very big.
Embodiment:
Describe the present invention by the relevant implementation step of following utilization below.
Circuit checking method based on circuit checking instrument, the main parts of carrying out are made up of main frame and two parts of terminal of circuit checking instrument, the main task of main frame is that the electric current of test line is sampled, harmonic wave is carried out frequency-domain analysis and time-domain analysis, find out eigenwert and analysis result is sent to handheld terminal by communication, give operating personnel with analysis result information by handheld terminal.The main task of terminal is to accept host command, produces certain frequency combined feature current signal when needing on test line.The main frame principle is: the secondary current signal of split-core type current mutual inductor after with conversion is sent to the instrument operational amplifier, and amplifier gain is set as required by CPU.The output of amplifier connects 24 A/D samplings, and A/D sampling back data are sent to CPU, by CPU sampled data are carried out corresponding analysis and calculate.The result mails to terminal by serial ports and radio receiving transmitting module.The terminal principle is: terminal MCU receives the instruction that main frame is sent, and the controlling features generator produces the characteristic current signal.Characteristic signal drives IGBT and produces the auxiliary detection current signal for the main frame detection on pull-up resistor by isolating.Terminal MCU receives the analysis result of main frame and is shown to operating personnel by communication part, and wherein main processing procedure comprises:
1, communication process
Under short distance, clog-free substantially situation, can take the directly method of test, but in case draw distance test (DT), the transmission reliability of data descends greatly, error code presents non-linear rising, in this case, and for guaranteeing transmission reliably, adopt the current return method of testing, solved carrier voltage signal get lines crossed problem and attenuation problem.
2, the program control amplification of self-adaptation
For the electric current of distribution line, at its low pressure outlet cable place at transformer, its electric current changes from tens and pacifies kilo-ampere to the hundreds of, and variation range is sizable, can reach tens DB.This moment is according to the amplitude of input signal, by digital circuit and mimic channel, control the gain of amplifying circuit by certain algorithm by CPU, obtain basicly stable analog quantity output, method with this similar digital Auto Gain control can keep certain sampled voltage, guarantees enough signal resolution, can make 0～10KHz section that frequency response very uniformly all should be arranged, and do not have nonlinear distortion, thereby guarantee analysis result accurately and reliably.
3, time-domain and frequency-domain analysis
In interference and noise, useful signal is extremely faint.Select this moment to carry out filtering with digital comb filter, filtering at 50Hz is that main each harmonic component characteristic signal is extracted influences great amplitude, strengthen the extraction and the resolution sensitivity of characteristic signal, after the strong jamming digital comb filter filters, used the MLE signal parameter algorithm for estimating in the signal estimation technique, system noise is filtered, be provided with by system dynamics adjustment digital filter parameters and extract useful characteristic signal.
For guarantee to analyze accurately and reliability, for also passing through frequency-domain analysis through the signal after the time-domain analysis processing.Time series after will handling through time-domain analysis to frequency domain, is manifested its watermark feature by Fast Fourier Transform (FFT), in conjunction with fuzzy recognition technology, comes further recognition feature signal.
4, self-adaptive features power signal control
Because the size of current on circuit to be measured changes very large and can't determine, main frame and terminal are in practical work process, must be according to the line current size by the control of self-adaptive features power signal, adjust the characteristic signal power of terminal in good time, the feature power signal is changed, in order to the accuracy that guarantees to detect with the size variation of electric current.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. based on the circuit checking method of circuit checking instrument, it is characterized in that, utilize circuit checking instrument, implement the interlock circuit inspection, mainly comprise four steps:
(1), communication process, use the current return method of testing;
(2), the program control amplification process of self-adaptation, by digital circuit and mimic channel, control the gain of amplifying circuit by certain algorithm by CPU, keep certain sampled voltage.
(3), the time-domain and frequency-domain analytic process, use digital comb filter to carry out filtering, in conjunction with MLE signal parameter algorithm for estimating, after system noise filtered, use fuzzy recognition technology further to discern.
(4), self-adaptive features power signal control procedure, by the control of self-adaptive features power signal, adjust the characteristic signal power of terminal according to line current size.
2. the circuit checking method based on circuit checking instrument according to claim 1 is characterized in that, in described time-domain analysis process, uses digital comb filter, and estimates the parameter of characteristic signal with MLE signal parameter algorithm for estimating.
3. the circuit checking method based on circuit checking instrument according to claim 1 is characterized in that, in described frequency-domain analysis process, adopts fuzzy recognition technology.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101514004A CN101833062B (en) | 2010-04-21 | 2010-04-21 | Circuit checking method based on circuit checking instrument |
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| CN2010101514004A CN101833062B (en) | 2010-04-21 | 2010-04-21 | Circuit checking method based on circuit checking instrument |
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| CN101833062B CN101833062B (en) | 2012-05-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063967A (en) * | 2013-01-10 | 2013-04-24 | 余力鑫 | Switching room user identification method and switching room user identification device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6545910B2 (en) * | 2001-04-10 | 2003-04-08 | Samsung Electronics Co., Ltd. | Non-volatile semiconductor memory device having word line defect check circuit |
| CN101034117A (en) * | 2007-04-02 | 2007-09-12 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN101556292A (en) * | 2009-05-21 | 2009-10-14 | 易智桢 | User line checking meter |
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2010
- 2010-04-21 CN CN2010101514004A patent/CN101833062B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6545910B2 (en) * | 2001-04-10 | 2003-04-08 | Samsung Electronics Co., Ltd. | Non-volatile semiconductor memory device having word line defect check circuit |
| CN101034117A (en) * | 2007-04-02 | 2007-09-12 | 武汉大学 | Power transmission line power frequency parameters measuring method and device |
| CN101556292A (en) * | 2009-05-21 | 2009-10-14 | 易智桢 | User line checking meter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063967A (en) * | 2013-01-10 | 2013-04-24 | 余力鑫 | Switching room user identification method and switching room user identification device |
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| CN101833062B (en) | 2012-05-30 |
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