CN207408505U - A kind of arrester early defect live testing system based on total current harmonic wave vector - Google Patents
A kind of arrester early defect live testing system based on total current harmonic wave vector Download PDFInfo
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- CN207408505U CN207408505U CN201721326232.1U CN201721326232U CN207408505U CN 207408505 U CN207408505 U CN 207408505U CN 201721326232 U CN201721326232 U CN 201721326232U CN 207408505 U CN207408505 U CN 207408505U
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Abstract
The utility model is related to fields of measurement, more particularly to a kind of arrester early defect live testing system based on total current harmonic wave vector, the accurate extraction to current in resistance property and harmonic current components can be achieved, realize the correct diagnosis of arrester state, the purpose that experiment is easy, safe can reach by the utility model, and a kind of safe and simple, efficiently and accurately solution is provided for arrester O＆M.
Description
Technical field
The utility model is related to fields of measurement more particularly to a kind of arrester early defects based on total current harmonic wave vector
Live testing system.
Background technology
Live testing is combined with infrared detection has become arrester prerun main means.It is mended in the capacity current for accounting for mainstream
It repays in method practice, because of security reason, does not take PT secondary singals or transfer that station is taken to become reference voltage, bring larger principle
Error and the live reasons such as interphase interference and instrument, it is impossible to accurately measure current in resistance property value or even erroneous judgement occur, fail to judge
The problem of, affect validity of the live testing technology to arrester defect diagonsis.
Capacitive current compensation method is method the most ripe in principle in current lightning arrester live-line test, by taking system electric
Signal is pressed to be compensated to the capacitive part in total current as benchmark, obtain the current in resistance property of reflection arrester active loss
Component.The extraction of system voltage signal has two kinds of approach of tablet method of PT secondary voltages and space electric field.
PT secondary voltage extraction methods are technically the most ripe, are the standing procedures of lightning arrester live-line test.It is but such
Method is easily influenced be subject to interphase interference, and instrument manufacturing producer is passed through in terms of interphase interference compensation and system rejection to disturbance ability
Mostly in generation, improves, and has formed more mature method.But this kind of method needs to obtain voltage transformer secondary in production scene
Side measures voltage as benchmark, and inconvenience is brought in live testing practice, and is brought to live secondary device operation
Certain security risk.In the case where emphasizing security background, grass-roots unit attempt extraction station with ac voltage signal as the reference voltage
Method, stand with ac voltage signal and working voltage signal is become there are phase angle difference, can not play and offset capacitive current component
Effect, this method in principle there are it is congenital the defects of, the reference voltage of acquirement is unable to reach the measurement for taking PT secondary voltages
Precision.
The tablet method of space electric field, the method for the induced voltage signal substitution voltage transformer signal of tablet, still
This kind of method is easily subject to interphase interference, it is reported that, such method needs tester repeatedly to adjust placement location, with PT bis- times
The test result of voltage extracting method can not coincide, and test result dispersiveness is big, and uniformity is very undesirable.The arrester of mainstream at present
There are a tablet method test function in Jinan Fan Hua instrument companies of live testing manufacturer, and during actual test, tablet equally can be by
It influences, is only put on B phase lightning arrester bases, the electric current of side relative induction plate will not just sense B phases to side phase electric field signal
The angle of electric current has an impact.But it is limited in that, actual measurement is more sensitive to the installation site of tablet, particularly three
When phase situation is asymmetric or around has the busbar of horizontal drawing, test result more seems inaccurate, and the repeatability of experiment is not strong,
Scene is less to use.
Site layout project mode brings lightning arrester live-line test the influence of interphase interference, although the instrument of existing maturation is equal
There is alternate compensation function, but effect is undesirable in practical application.Existing lightning arrester live-line test method can not draw resistive electricity
The exact value of stream, the result of live testing do not pursue the accuracy of test data, and the validity of live testing is mainly reflected in
The lateral comparison of test data, occurring the arrester deteriorated individually can find to come out in lateral comparison, it is difficult to criticizing
Secondary property, familial defect arrester state are reflected, and are difficult to find arrester early defect.
Live testing is there is also the situation of erroneous judgement, and in Practical on-site test, there is also live testings to pinpoint the problems, and
Situation without exception is tested after power failure.
The nonlinear characteristic of arrester resistor disc so that the electric current generation for flowing through resistor disc distorts, generation triple-frequency harmonics, and three
Subharmonic method becomes a kind of detection hand for examining arrester resistor disc aging performance by measuring third-harmonic component in total current
, there is corresponding commercialized instrument and is applied in systems in section.But this method has following deficiency：1. triple harmonic current
Value is smaller, and accurate acquisition has difficulties；2. triple-frequency harmonics reflection resistor disc resistance value is non-linear, that is to say, that can only reflect resistance
The deterioration condition of piece can not reflect the defects of arrester makes moist, and limit the application of this method.It is reported that triple-frequency harmonics
Method there is no the report of large-scale application in systems, be intended only as a kind of auxiliary reference means of arrester state-detection.
At present, live testing instrument manufacturer is numerous, and test philosophy, antijamming capability are different, and the equipment quality good and the bad is not
Together, in practice usually can not usage history data carry out longitudinal comparison, the trend of arrester deterioration is difficult to from historical data
It reflects.On April 25th, 2013,500kV Shantou station 500kV Shans banyan A-wire arrester are afterwards, right because lightning stroke is broken down
The reason for DC experiment for perfecting phase arrester is tested, and the results show leakage current is exceeded, confirms that resistor disc deteriorates, failure is point
Deteriorating in the case where the accumulation for bearing multiple lightning stroke is impacted occurs in analysis resistor disc, accelerated deterioration, and occurs under subsequent working voltage
Thermal runaway.The arrester live testing data of nearly 3 years are transferred,
Arrester test site complex environment, the problem of also bringing live high interference.Test data is easily subject to ring
The influence of temperature, humidity, rainfall, arrester contamination degree of surface of electric, the electromagnetic environment in border etc. causes the inaccuracy of data.
Another current problem is safety problem.Have when taking voltage transformer signal at the scene inconvenience and safety it is hidden
Suffer from：1. operations staff is needed to coordinate access voltage transformer signal, there are maloperation risks；2. it needs additionally to increase isolation dress
It puts, prevents that signal seals in voltage transformer in instrument；3. there is short-circuit risks for voltage transformer signal.Safety, letter are not met
Just the technological development direction of lightning arrester live-line test.
Since existing lightning arrester live-line test technology is there are disadvantages mentioned above, live testing data validity is deposited at present
In deficiency.
Utility model content
For defect in the prior art, the utility model proposes a kind of arresters based on total current harmonic wave vector
Early defect live testing system and method are realized lightning-arrest, it can be achieved that accurate extraction to current in resistance property and harmonic current components
The correct diagnosis of device state can reach the purpose that experiment is easy, safe by the utility model, and provide one for arrester O＆M
Kind solution safe and simple, efficiently and accurately.
The technical solution of the utility model is：
A kind of arrester early defect live testing system based on total current harmonic wave vector, the wherein system include lightning-arrest
Device total current measurement device and expert system；
Arrester total current measurement device includes light current current transformer, input terminal, filter unit, automatic range switching list
Member, amplifying unit, level bias circuit, AD sampling units, CPU, storage unit, USB interface, the light current current transformer pass through
The input terminal connection of arrester ground line sampled current signals, output terminal and input terminal, the output terminal of input terminal and filter
The input terminal connection of ripple unit, the output terminal of filter unit are connected with automatic range switching unit, automatic range switching unit
Output terminal is connected to the input terminal of amplifying unit, and the output terminal of amplifying unit is connected to the input terminal of level bias circuit, level
The output terminal of biasing circuit is connected to the input terminal of AD sampling units, and the output terminal of AD sampling units is connected to the input terminal of CPU,
The output terminal of CPU connects storage unit, USB interface, the input terminal of automatic range switching unit respectively, and expert system passes through
USB interface is connected with arrester total current measurement device.
Light current current transformer is transported to after arrester gathers full current signal, then by full current signal by input terminal
Filter unit is filtered, and filtered full current signal input range automatic switch unit carries out the judgement of range, has judged
The full current signal arrival amplifying unit for reaching standard afterwards is amplified, and amplified full current signal passes through level bias circuit
It is corrected, the full current signal after correction is input to AD sampling units and is sampled, and the full current signal after sampling is input to
CPU carries out that current in resistance property and capacity current is calculated, and result of calculation is transmitted to expert system by CPU by USB interface
The quality that analysis comparison judges arrester is carried out, while the result of calculation of CPU is also transported to storage unit and is backed up.
Further, being established in expert system has database, calculated in database comprising various model arrester models,
The much informations such as product characteristic data, in-site measurement environment, historical measurement, the arrester total current measurement device will be surveyed
Test result uploads to expert system by USB interface, expert system by the data in test result and database into
Row compares, with reference to artificial evaluation reference, it may be difficult to which the data message of deciphering is converted to intuitively user test conclusion output, judges
The degradation of the arrester.
Further, light current current transformer is high-precision mutual inductor.Since the leakage current in arrester is all milliampere grade,
Wherein triple-frequency harmonics may all be microampere order, and the current transformer of so requirement sampling can accurately sample the letter of microampere order
Number, the precondition accurately measured is provided.
Compared with prior art, the beneficial effects of the utility model are：
（1）Strong antijamming capability can accurately measure three times under thousand times of capacity current interference and other clutter interferences
The vector of harmonic wave.
（2）The utility model need to only sample arrester full current signal, without PT secondary singals, you can judge arrester
Deterioration condition can reach the purpose that experiment is easy, safe.
（3）Intelligence degree is high, can automatic switching range, can preserve as a result, test waveform can be exported, be very beneficial for into
The technology analysis of one step.
（4）System core part is CPU and software algorithm, is conducive to protect intellectual property.
Description of the drawings
Fig. 1 is a kind of arrester early defect live testing system schematic based on total current harmonic wave vector.
Specific embodiment
Attached drawing is only for illustration, it is impossible to be interpreted as the limitation to this patent；It is attached in order to more preferably illustrate the present embodiment
Scheme some components to have omission, zoom in or out, do not represent the size of actual product；To those skilled in the art,
Some known features and its explanation may be omitted and will be understood by attached drawing.Being given for example only property of position relationship described in attached drawing
Explanation, it is impossible to be interpreted as the limitation to this patent.
Embodiment 1：
As shown in Figure 1, a kind of arrester early defect live testing system based on total current harmonic wave vector, wherein this is
System includes arrester total current measurement device and expert system；
Arrester total current measurement device includes light current current transformer, input terminal, filter unit, automatic range switching list
Member, amplifying unit, level bias circuit, AD sampling units, CPU, storage unit, USB interface, the light current current transformer pass through
The input terminal connection of arrester ground line sampled current signals, output terminal and input terminal, the output terminal of input terminal and filter
The input terminal connection of ripple unit, the output terminal of filter unit are connected with automatic range switching unit, automatic range switching unit
Output terminal is connected to the input terminal of amplifying unit, and the output terminal of amplifying unit is connected to the input terminal of level bias circuit, level
The output terminal of biasing circuit is connected to the input terminal of AD sampling units, and the output terminal of AD sampling units is connected to the input terminal of CPU,
The output terminal of CPU connects storage unit, USB interface, the input terminal of automatic range switching unit respectively, and expert system passes through
USB interface is connected with arrester total current measurement device.
Light current current transformer is transported to after arrester gathers full current signal, then by full current signal by input terminal
Filter unit is filtered, and filtered full current signal input range automatic switch unit carries out the judgement of range, has judged
The full current signal arrival amplifying unit for reaching standard afterwards is amplified, and amplified full current signal passes through level bias circuit
It is corrected, the full current signal after correction is input to AD sampling units and is sampled, and the full current signal after sampling is input to
CPU carries out that current in resistance property and capacity current is calculated, and result of calculation is transmitted to expert system by CPU by USB interface
The quality that analysis comparison judges arrester is carried out, while the result of calculation of CPU is also transported to storage unit and is backed up.
Wherein, being established in expert system has database, is calculated in database comprising various model arrester models, production
The much informations such as product performance data, in-site measurement environment, historical measurement, the arrester total current measurement device will be tested
As a result expert system is uploaded to by USB interface, expert system carries out the data in test result and database
It compares, with reference to artificial evaluation reference, it may be difficult to which the data message of deciphering is converted to intuitively user test conclusion output, and judging should
The degradation of arrester.
Wherein, mathematical derivation algorithm is as follows between arrester harmonic current vector and current in resistance property：
Apply voltage to arrester as sinusoidal voltage, i.e. U=Umsin（ω t+ Ψ）, arrange and be present with 3 subharmonic currents
Ir3=K3Umsin（3 ω t+ Ψ 3）.As long as arrester resistance R is certainly existed 3 times there are non-linear i.e. i >=3 in current in resistance property
Harmonic component.See from K3 expression formulas：K3, K5 are bigger, i.e., non-linear stronger, and 3 order harmonic components are bigger；That is ir3 with
Nonlinear factor K3, K5 is directly proportional.Triple harmonic current phase Ψ 3 and voltage-phase Ψ into invariant relation Ψ 3=3 Ψ, therefore from
The phase angle Ψ 3 of Ir3 can obtain voltage phase angle Ψ.1 50Hz dfundamental-harmonic pair answers the waveform of 3 triple-frequency harmonics, and 1 therein humorous three times
Ripple zero crossing is overlapped with fundamental wave zero crossing, i.e. " same to phase ", and another two differs 120 °, 240 ° with fundamental wave respectively.By measuring three times
The phase of harmonic wave, can extrapolate the phase angle of fundamental wave has 3 kinds of possible outcomes.And the phase of known fundamental wave and circuital phase phase
Nearly 90 ° of differential can then be determined for compliance with the fundamental voltage phase correct result of this requirement.Obtain the phase of fundamental voltage
Afterwards, fourier decomposition is carried out by total current, you can obtain capacity current vector, then subtract capacity current with total current to obtain
To current in resistance property.
Since the leakage current of arrester is all often mA grades, and current in resistance property only accounts for circuital 10%-20%, resistive electricity
Third-harmonic component in stream is even more may there was only uA grades, can be at up to a hundred or even thousands of times using high-precision light current current transformer
Capacity current interference under, the accurate amplitude and phase characteristic for analyzing harmonic component.Total current uses high-precision weak current
Mutual inductor is sampled, and the current signal collected is converted into voltage signal and is suitably amplified（Amplification 1000 times, i.e., after
Continuous gained output data/V correspondences/mA）Subsequently to carry out triple-frequency harmonics bandpass filtering.Since the bandwidth of filtering is small, bound
Cutoff frequency is relatively close, should not be adopted as individual low pass with high-pass filter to realize, therefore, use centre frequency for
The multiple negative-feedback bandwidth-limited circuit of six ranks and peak detection circuit and correcting circuit of 100 Hz realizes arrester leakage electricity
The measurement of stream carries out digital processing finally by DSP and institute's measured data is analyzed.
The arrester total current measurement device use automatic range switching technology, automatic range switching unit by it is multiple not
Resistance with resistance value is in series, and separates multiple ranges in different positions, corresponds to the ranges such as 100uA, 1mA, 10mA respectively.
CPU procedure identifications simultaneously automatically control the corresponding relay of switching so that signal amplitude size is in optimal measurement range.
For the common interference of current site environment, corresponding matched filtering algorithm is designed, for different spectral feature
Interference maximizes criterion according to SINR, establishes corresponding interference blocking matched filter, do not injuring signal of concern characteristic
Under wall, ambient noise is reduced as far as possible.
In addition to using interference injection matched filter techniques to interference, for useful signal, it is contemplated that in signal
The characteristics of being mixed between capacitive ingredient and resistive composition, using separation algorithm.Signal separator wherein based on high-order statistic is calculated
Method good separating effect, requirement to signal is low, the algorithm speed of service is fast, therefore work done in the manner of a certain author is disturbs separated book to want technological means.
Specific to select " blind separation " technology, this technology depends on the high-order statistic information in non-gaussian type signal, distinguishes different
Signal component, relevant algorithm include " independent component analysis "（ICA）With non-linear " principal component analysis " algorithm.Believed using mixing
The statistical iteration or uncorrelated nature of number final unlike signal ingredient are separated.Since this algorithm depends on certain time
The statistical property of all sample of signal in window has random disturbances in short-term and noise certain rejection ability, and can pass through
The energy accumulation of long-time signal improves weak signal Detection capability.Relevant algorithm is in bioelectrical signals detection, audio signal point
It is used widely from the Testing of Feeble Signals field under the strong jammings such as, faint wireless signal acquisition, algorithm feasibility is guaranteed.
In terms of harmonic components analysis, traditional discrete Fourier transform is due to being subject to signal length, interference and rectangular window
The spectrum leakage problem of mouth, although this problem can improve name by changing the shape of window, theoretically frequency spectrum is differentiated
Limited ability is in signal length.In order to improve harmonic wave resolution capability, intend using " Modern spectral estimation " algorithm, pass through signal subspace
Model, direct estimation harmonic wave vector characteristics parameter therein, since Power estimation algorithm is in terms of short signal frequency spectrum resolving power
Advantage so that it is highly suitable for high-precision harmonic wave vector measurement and analysis.
Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to the embodiment of the utility model.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
It is exhaustive.All any modification, equivalent and improvement made within the spirit and principle of the utility model etc., should be included in
Within the protection domain of the utility model claims.
Claims (3)
- A kind of 1. arrester early defect live testing system based on total current harmonic wave vector, which is characterized in that the system bag Include arrester total current measurement device and expert system；Arrester total current measurement device include light current current transformer, input terminal, filter unit, automatic range switching unit, Amplifying unit, level bias circuit, AD sampling units, CPU, storage unit, USB interface, the light current current transformer are passed through and kept away Thunder device is grounded sampled current signals, the input terminal connection of output terminal and input terminal, the output terminal of input terminal and filtering The input terminal connection of unit, the output terminal of filter unit is connected with automatic range switching unit, automatic range switching unit it is defeated Outlet is connected to the input terminal of amplifying unit, and the output terminal of amplifying unit is connected to the input terminal of level bias circuit, and level is inclined The output terminal of circuits is connected to the input terminal of AD sampling units, and the output terminal of AD sampling units is connected to the input terminal of CPU, The output terminal of CPU connects storage unit, USB interface, the input terminal of automatic range switching unit respectively, and expert system passes through USB interface is connected with arrester total current measurement device.
- 2. a kind of arrester early defect live testing system based on total current harmonic wave vector according to claim 1, It is characterized in that, being established in the expert system has database, calculated in database comprising various model arrester models, Product characteristic data, in-site measurement environment, the information of historical measurement, the arrester total current measurement device will be tested and tied Fruit uploads to expert system by USB interface, and expert system compares test result and the data in database It is right, with reference to artificial evaluation reference, it may be difficult to which the data message of deciphering is converted to intuitively user test conclusion output, judges that this is kept away The degradation of thunder device.
- 3. a kind of arrester early defect live testing system based on total current harmonic wave vector according to claim 1, It is characterized in that, the light current current transformer is high-precision mutual inductor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561393A (en) * | 2017-10-16 | 2018-01-09 | 广东电网有限责任公司惠州供电局 | A kind of arrester early defect live testing system and method based on total current harmonic wave vector |
| CN111796205A (en) * | 2020-07-08 | 2020-10-20 | 安徽先兆科技有限公司 | AC220V loop electric safety control method and system |
-
2017
- 2017-10-16 CN CN201721326232.1U patent/CN207408505U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561393A (en) * | 2017-10-16 | 2018-01-09 | 广东电网有限责任公司惠州供电局 | A kind of arrester early defect live testing system and method based on total current harmonic wave vector |
| CN111796205A (en) * | 2020-07-08 | 2020-10-20 | 安徽先兆科技有限公司 | AC220V loop electric safety control method and system |
| CN111796205B (en) * | 2020-07-08 | 2023-05-05 | 安徽先兆科技有限公司 | AC220V loop electric safety control method and system |
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