CN104849685A - Partial discharge detector performance evaluation method - Google Patents
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- CN104849685A CN104849685A CN201510206995.1A CN201510206995A CN104849685A CN 104849685 A CN104849685 A CN 104849685A CN 201510206995 A CN201510206995 A CN 201510206995A CN 104849685 A CN104849685 A CN 104849685A
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Abstract
The invention provides a partial discharge detector performance evaluation method, which comprises a partial discharge map database, a partial discharge pulse sequence generator and a trigger circuit, wherein the partial discharge map database serves as a reference source of the partial discharge pulse sequence generator for simulation output of discharge maps; the partial discharge pulse sequence generator outputs the discharge maps in a partial discharge pulse sequence mode according to maps in the partial discharge map database; and the trigger circuit is used for generating synchronization signals, and the synchronization signals are used for triggering the output of the discharge maps in each period. The partial discharge detector performance evaluation method can generate different types of partial discharge pulse sequences, including basic programmable calibration pulse sequences to simulation of partial discharge maps of different insulation defect models, so as to satisfy requirements for different nominal performance evaluation of different digital type partial discharge measuring instruments; and the partial discharge detector performance evaluation method can be used for verifying functions of the partial discharge measuring instruments and improving performances thereof at the design stage, so as to reduce required experiments and tests.
Description
Technical field
The present invention relates to the Performance Evaluation of Partial discharge detector, particularly, relate to Partial discharge detector's performance estimating method.
Background technology
Measurement of partial discharge is a kind of non-destructive method of effective detection high voltage electric equipment insulation defect.The existence of insulation defect can strengthen the electric field of regional area around it, thus causes the insulation breakdown of local, and the fast transfer of electric charge occurs in this zonule.Partial Discharge Detection is normally based on the assessment to the electric parameters in discharge process or non-electrical signal.As everyone knows, the generation of shelf depreciation may cause the progressively deterioration of insulating also finally to cause failure of insulation.Therefore, the detection of shelf depreciation, location and diagnosis assess requisite work to high voltage electric equipment insulation status.
At present, measurement of partial discharge instrument (PDMIs, Partial discharge measuring instruments) is from the analogue type equipment development of early stage apparent charge amount of can only measuring to the digitized instrument that can perform more higher level operations such as PD Pattern Recognition.The size of apparent charge amount only can indicate shelf depreciation whether to exist and the order of severity, and pass through the frequency spectrum of the amplitude of each pulse and the relation (PRPD-phase resolved partial discharge) between phase angle distribution and the high voltage of test added by test product or partial discharge pulse's waveform in analysis partial discharge pulse sequence, more information about causing shelf depreciation insulation defect can be obtained.Therefore, many digital partial discharge measuring instruments adopt Digital Signal Processing to carry out statistics or time frequency analysis to partial discharge pulse's sequence that sampling obtains, and realize the classification to local electric discharge type and identification, carry out ELIMINATION OF ITS INTERFERENCE and squelch simultaneously.
The Premium Features of PDMIs make its application extend to on-the-spot live detection and insulation diagnosis from the off-line test in laboratory, and then constantly propose new functional requirement again.The shelf depreciation prover that major part is traditional can only export the charge pulse of known discharge capacity with fixing repetition frequency, can be used for verifying the characteristics such as the linearity of PD meter and polarity effect, shelf depreciation prover able to programme then can carry out extra test, as the performance that the standard such as Sequence Response and pulse resolution defines, and all said process are just for calibration and the assessment of surveyed apparent charge.At present, standard or the step determined seldom is had to carry out the instrument of assessed for performance advanced person.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of Partial discharge detector performance estimating method.The present invention, on shelf depreciation prover basis able to programme, originally proposes Partial discharge detector's performance estimating method.The present invention can have the pulse train of true shelf depreciation collection of illustrative plates statistical nature by physical simulation.
According to a kind of Partial discharge detector provided by the invention performance estimating method, comprise: by partial discharge pulse's sequence and the electric discharge collection of illustrative plates thereof of emulation, carry out partial discharge pulse that is virtually reality like reality process, to assess the performance of measurement of partial discharge instrument, wherein, partial discharge pulse's sequence of described emulation is that physical simulation exports;
Wherein, partial discharge pulse's sequence of described emulation realizes physical simulation as follows to export:
Set up shelf depreciation spectrum data storehouse, for the reference source as partial discharge pulse's sequence generator simulation data electric discharge collection of illustrative plates;
By partial discharge pulse's sequence generator, come according to the collection of illustrative plates in described shelf depreciation spectrum data storehouse, export electric discharge collection of illustrative plates with partial discharge pulse's sequential manner;
Arrange trigger circuit, to produce output synchronizing signal, wherein, described synchronizing signal is the triggering that described electric discharge collection of illustrative plates each cycle exports.
Preferably, the collection of illustrative plates in described shelf depreciation spectrum data storehouse, have recorded following information:
The shape information of-partial discharge pulse;
The information of-shelf depreciation test;
The characteristic information of each pulse in-partial discharge pulse sequence.
Preferably, partial discharge pulse's sequence generator, comprises the series capacitor of waveform generator AWG and the calibration be connected;
Waveform generator AWG is used for producing step voltage according to any one pattern following, and recurrence of laying equal stress on send described step voltage to the series capacitor of described calibration, to export corresponding partial discharge pulse sequence:
-monopulse repeat pattern;
-pulse train pattern;
-dynamic sequence pattern;
Wherein:
In described monopulse repeat pattern, described waveform generator AWG produces program control step voltage, and the series capacitor repeating step voltage to be sent to described calibration is with output pulse sequence; Wherein, described step voltage a), b), c) and d) is made up of the essential part of four successively: a) original levels section, to be value be zero voltage; B) rising edge section; C) voltage maintains section, connects described rising edge section and negative edge section; D) negative edge section;
In described pulse train pattern, described partial discharge pulse sequence generator export pulse rise time be fixed as 1.8 nanoseconds, 2.1 nanoseconds or 4.8 nanoseconds, the time interval of the amplitude of pulse and quantity and adjacent pulse and polarity are obtained or stochastic generation by definition separately, and pulse train exports single or by determining that frequency repeats or triggered by external synchronization signal;
In described dynamic sequence pattern, each pulse train is that the pulse height of the continuous impulse in each synchronizing cycle and the time interval are for dynamically arranging or reading from file by a triggering.
Preferably, in dynamic sequence pattern, first described partial discharge pulse sequence generator reads the pulse train of collection of illustrative plates from described shelf depreciation spectrum data storehouse, and wherein, collection of illustrative plates comprises pulse-response amplitude and phase angle; Subsequently the pulse train of this collection of illustrative plates is divided into set of pulses fragment according to power frequency period, the pulse of the corresponding power frequency period of each pulse fragment;
When electric discharge collection of illustrative plates after compiling exports, each pulse fragment triggers by an outer triggering signal; Wait for more than 1 (such as 2 or 3) cycle period after exporting, then export the pulse fragment of next simulation.
Preferably, described trigger circuit comprise isolating transformer, low-pass filter, comparer;
Isolating transformer coupling civil power, the signal of coupling forms sinusoidal synchronizing signal after low-pass filter, this sinusoidal synchronizing signal produces a square-wave signal in a comparator with after a DC voltage, the rising edge of this square-wave signal, as synchronizing signal, is the triggering that electric discharge collection of illustrative plates each cycle exports.
In preference, the present invention carrys out partial discharge pulse that is virtually reality like reality process by partial discharge pulse's sequence of emulation and shelf depreciation collection of illustrative plates, assess the performance of measurement of partial discharge instrument by partial discharge pulse's sequence of emulation, partial discharge pulse's sequence of emulation is exported by Partial discharge detector's performance estimating method physical simulation
Preferably:
The shape information of-partial discharge pulse is complete partial discharge pulse's waveform, sensors coupled capacitor, High Frequency Current Sensor, superfrequency Wide antenna etc. that wave recording is used;
The information of-shelf depreciation test, the environment of added voltage when comprising collection of illustrative plates test, shelf depreciation type corresponding to collection of illustrative plates, shelf depreciation test and discharge source;
The characteristic information of each pulse in-partial discharge pulse sequence, comprises the amplitude of each pulse, polarity, pulsion phase parallactic angle or the moment of pulse generation, the time and frequency parameter of pulse.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention can produce dissimilar partial discharge pulse's sequence, comprises the emulation of basic calibration pulse sequence able to programme to the shelf depreciation collection of illustrative plates to different insulative defect model, to meet the requirement of the different nominal performance assessment of different digital PDMIs.
2, the present invention can be used for PDMI functional verification, and improves their performance in the design phase, to reduce required experimental test.
3, the application of the present invention to PDMI performance evaluation shows the potentiality of its development.Invention demonstrates a method its some specific functions to surveying instrument, as key property, record the ability of whole pulse train, to sampling pulse amplitude and time interval precision, the validity of electric discharge collection of illustrative plates pattern-recognition under local discharge signal noise existence condition and bipolarity detects and to the classification of shelf depreciation collection of illustrative plates, test.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is that collection of illustrative plates is put in the office that three kinds of shelf depreciation realistic models produce;
Fig. 2 is the structural drawing of the evaluating system that can realize Partial discharge detector's performance estimating method;
Fig. 3 is for generating step voltage waveform figure;
Fig. 4 is the dynamic pulse sequence example of three activation period;
Fig. 5 is PRPD collection of illustrative plates simulation data B) with its data source A) contrast;
Fig. 6 is the normalized pulse train quantity of electric charge and time interval measurement result;
Fig. 7 is the testing result of emulation shelf depreciation collection of illustrative plates.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
the requirement of numeral PD meter Performance Evaluation
The principal character of digital partial discharge measuring instrument (PDMI) to store obtained shelf depreciation time domain waveform or relevant characteristic parameter, as the time of origin of each partial discharge pulse, apparent charge amount, phasing degree relative to added trial voltage.These information are all obtained from the core component of instrument, digitizer (AD-analogue to digital convertor), and whole instrument also comprises the simulating signal pretreatment unit before AD and digitizing post-processing unit composition.
The characteristic test of analogue type PDMI defines by the standard of being correlated with completely, and for the test of some additional functionalities that digital P DMI performs, standard only provides some of the recommendations.Based on the program of analog PDMI performance test, consider the Performance Evaluation with the digital P DMI of additional function, following Test Suggestion should be included:
(1) test according to the key property of IEC60270 standard, as the linearity, pulse resolving time, impulse response, polar effect.
(2) record that the partial discharge pulse's sequence verifying each partial discharge pulse responds, examines its phasing degree and whether amplitude is accurate.
(3) to the advance of sampled data aftertreatment instrument and the assessment of validity.
For the test of above-mentioned (1) item suggestion, some have additional function, and the prover as exported partial discharge pulse able to programme sequence just can be implemented.Applicant previously just developed and applied a shelf depreciation prover able to programme (see M.Chiampi, G.Crotti, Y.Hu, A.Sardi, " Development and Application of a Programmable Partial Discharge Calibrator, " IEEE.Trans.Instr.and Meas., vol.58, no.4, pp.768-774, April 2009).Therefore, the key issue assessing digital P DMI concentrates on the test of two suggestions next.Meet the condition of these two tests, should consider that the shelf depreciation sequence of an employing stochastic generation is to detect the test acquisition capacity of PDMI.For this reason, using a real partial discharge pulse's sequence be associated with known defect, is the optimal selection of checking digital P DMIs performance (as shelf depreciation classification and identification).
The method of current generation true partial discharge pulse sequence is obtain based on partial discharge model or the test of true type power equipment substantially.This needs one to apply high-voltage power supply, and prepares necessary shelf depreciation defect model, and this is a very difficult task.Therefore, a system can simulating partial discharge pulse's sequence is used to become a kind of very promising method realizing digital P DMI Performance Evaluation.The most important benefit of use partial discharge pulse series model system is, when not having high-voltage power supply, it can reappear partial discharge pulse's sequence, each partial discharge pulse in this pulse train has the amplitude and phasing degree determined, but it has again the statistical property identical with actual partial discharge phenomenon.
Consider that, in above-mentioned factor, digital P DMI performance evaluation system need have following functions:
(1) can export partial discharge pulse able to programme sequence, the time interval between the electric discharge amplitude of pulse train, continuous print partial discharge pulse, repetition frequency can set, and to be correlated with key property test to carry out PDMI;
(2) can export random partial discharge pulse sequence, each pulse in pulse train has random length, random magnitude and the time interval, to verify that PDMI catches the accuracy of pulse;
(3) energy simulation data partial discharge pulse collection of illustrative plates, the pulse train of the emulation collection of illustrative plates exported, the collection of illustrative plates of emulation is the reflection of the true random character of different electric discharge phenomena, in order to test the validity of PDMI related tool, as disturbance ecology, shelf depreciation classification and identification.
Based on above-mentioned analysis, applicant has developed a PDMI performance evaluation system, this system is primarily of a shelf depreciation spectrum data storehouse and partial discharge pulse's sequence generator and trigger circuit composition thereof.The reference source of shelf depreciation spectrum data Ku Shi partial discharge pulse sequence generator simulation data PRPD collection of illustrative plates.
the structure in shelf depreciation spectrum data storehouse
As everyone knows, dissimilar defect has the statistical property of the distribution of different burst length and distribution of amplitudes, and this comes from the mechanism of production of shelf depreciation.We generally adopt this species specificity to classify and identify insulation defect, and these defects can be divided into three major types typical types: insulating inner defect, insulate along planar defect and conductor tip.This three major types electric discharge collection of illustrative plates can be collected by three approach: shelf depreciation live detection, the digital simulation based on mathematical model and the emulation experiment based on typical defect.
In measurement of partial discharge at the scene, determine that the defect type of detected shelf depreciation collection of illustrative plates needs to find defect source, generally need disintegration power equipment even to cut into slices insulating material.Obtain the accumulation that typical shelf depreciation pattern needs experience one very long in this way.
The Digital Simulation of shelf depreciation collection of illustrative plates is one very promising electric discharge collection of illustrative plates production method.The shelf depreciation collection of illustrative plates of some type has mathematical model, and the amplitude of its apparent charge and PHASE DISTRIBUTION are studied in great detail.Such as, when infrabar and two electrode distances shorter, Paschen curve explains negative corona phenomenon (corresponding point discharge) well, and insulating inner bubble-discharge is described by the Whitehead model that simplifies often.Consider the impact of the generation of shelf depreciation electric charge and the stochastic process disappeared and machining area, then need a more accurate realistic model, further consider the factors such as the physical form of insulating medium characteristic, defect in discharge environment again, one more complicated realistic model is to this has been mathematical description, and digital simulation is a kind of flexi mode generating shelf depreciation.But, consider the complicacy of the process of shelf depreciation, also need to carry out experimental verification to simulation result.
The method of collecting typical shelf depreciation collection of illustrative plates most convenient carries out simulation electric discharge by artificial defect model, can be obtained the shelf depreciation collection of illustrative plates of analog simulation by it.If Fig. 1 is respectively in order to simulated interior, along face and point discharge defect three discharging models, based on measurement of partial discharge circuit in standard, adopt the electric discharge collection of illustrative plates of digital oscilloscope record.
Insulating inner partial discharge model is inserted multilayer insulation thin layer and is built between two flat metal electrodes, a certain insulation course wherein contains an artificial cavities, between electrode, apply certain power, and be coated with one deck insulating oil on the surface of electrode to avoid the existence of other air gaps.The characteristic of insulating inner defect can adjust by changing the thickness of insulation course or the shape of cavity and size.
The generation of creeping discharge is that the pointed metal needle by tiltedly placing variable diameter on a thin insulating trip realizes, and high voltage is applied between pin and the ground connection plate electrode under insulation course.
Most advanced and sophisticated (corona) collection of illustrative plates that discharges then is obtained to plate electrode (change the diameter of prong end and point to plan range) by corona unit or point.
realize the Operation system setting of Partial discharge detector's performance estimating method
The described system realizing Partial discharge detector's performance estimating method, its structure, as Fig. 2, comprises a shelf depreciation spectrum data storehouse, synchronous trigger circuit and partial discharge pulse's sequence generator.
Shelf depreciation spectrum data storehouse is the set of the electric discharge collection of illustrative plates obtained by the construction method in above-mentioned shelf depreciation spectrum data storehouse, except the shape information of discharge pulse, also have recorded the information of shelf depreciation test (such as, metering circuit and instrument, test film and the voltage applied), be also extracted the characteristic informations such as the amplitude of each pulse of partial discharge pulse's sequence and phase place simultaneously.
Partial discharge pulse's sequence can be reproduced by partial discharge pulse's sequence generator, and as shown in Figure 2, partial discharge pulse's sequence generator is primarily of the electric capacity stroke composition of AWG (Arbitrary Waveform Generator) (AWG) block coupled in series one through calibration.The plate that 16 AWG modules of this 200MS/s have 256MB carries internal memory, is arranged on the Lab VIEW programmed control in embedded controller by one.AWG module and controller are placed on a compact PXIe (PCI expands instrument) and are connected by PCI Express bus.
When system simulation produces PRPD collection of illustrative plates, export and synchronously produced by trigger circuit, these trigger circuit are mainly used to simulate " high voltage " signal.It is by an isolating transformer coupling civil power, the signal of coupling forms sinusoidal synchronizing signal after low-pass filtering, this sinusoidal synchronizing signal produces a square-wave signal, the rising edge of this square wave with after a DC voltage, is the triggering that electric discharge collection of illustrative plates each cycle exports.By changing DC reference voltage, the phase differential between trigger pip and synchronizing signal rising edge zero crossing can realize 0 degree and adjust to 90 degree.Simulation " high voltage " signal then comes from the amplification of synchronizing signal.
realize the function of Partial discharge detector's performance estimating method
Describedly realize Partial discharge detector's performance estimating method, pulse train can be produced at Three models:
-monopulse repeat pattern;
-pulse train pattern;
-dynamic sequence pattern.
At monopulse repeat pattern, AWG produces program control step voltage, and recurrence of laying equal stress on delivers to the series capacitor of calibration to export the pulse train of needs.The step voltage produced is made up of four essential parts as shown in Figure 3: a) original levels, and this is the value be connected with step voltage is the voltage of zero; B) quick rising edge, produces dash current and determines simulated spectrum; C) high voltage maintains, and connects quick rising edge above and D section (i.e. negative edge section); D) negative edge slowly, slight slope is in order to avoid inverted pulse occurs.Described slowly with described express delivery comparatively speaking.Rising edge is described by a hyperbolic tangent function, the superpotential after voltage can be avoided like this to rise fast.Under monopulse repeat pattern, produce the real-time setting of step voltage parameter (amplitude, rise time, pulse repetition rate and polarity) and renewal is realized by the user interface shown in Fig. 3.The scope of the electric charge produced is from 0.5 to 1000PC, and quick rising about 30 nanosecond that step voltage is the shortest, repetition frequency can be set in 0.1 hertz to 50 kilo hertzs.The monopulse repeated can be used for some key propertys (linearity, polar response, impulse response and pulse resolution) of testing PDMI.
When evaluating system operates in pulse train pattern, the rise time exporting pulse is fixed as 1.8 nanoseconds, 2.1 nanoseconds or 4.8 nanoseconds according to the output amplifier stage of AWG model choice.Pulse amplitude and quantity and their time interval and polarity can define separately or stochastic generation, the maximum length of pulse train is only limited to the size of internal system storage space, and the pulse train produced can export single or by determining that frequency repeats or triggers (normally power supply be correlated with) by external synchronization signal.Utilize known amplitude and the pulse train in the time interval, we can test the acquisition precision of the pulse-response amplitude of PMDI and phase place.
In dynamic pulse pattern, each pulse train is by a triggering, can by software design patterns or by external trigger (trigger pip of synchronizing circuit as described above).The pulse height of the continuous impulse in each synchronizing cycle and the time interval can carry out dynamically arranging or reading from file.Fig. 4 gives the output example of the dynamic pulse sequence containing three synchronizing cycles.
Dynamic sequence pattern, mainly through emulation shelf depreciation PRPD collection of illustrative plates, carrys out the Premium Features of check and evaluation PDMI.Under this application, program reads the pulse train (comprising pulse-response amplitude and phase angle) of selected PRPD collection of illustrative plates from database.This sequence is divided into set of pulses fragment according to power frequency period subsequently, the pulse of the corresponding power frequency period of each pulse fragment.When the PRPD collection of illustrative plates of compiling exports, each pulse fragment triggers by an outer triggering signal; Wait for 2 to 3 cycle periods after exporting, then export the pulse fragment of next simulation.This delay is not overlapping in order to ensure the pulse fragment of system output.Fig. 5 gives the contrast of the PRPD collection of illustrative plates of a simulation data and its data source in a database.The collection of this PRPD collection of illustrative plates is recorded by a PDMI be coupled with High Frequency Current Sensor, the shelf depreciation collection of illustrative plates of simulation data is measured by a high bandwidth PDMI according to calibration, and the high similarity between two PRPD figure Spectral structure demonstrates the PRPD collection of illustrative plates copying of digital shelf depreciation instrument performance evaluation system.
By adopting dynamic pulse pattern, different PRPD patterns can be added to a single pulse output sequence, in order to simulate the existence of multiple Partial Discharge Sources or interference and noise.
the application of Partial discharge detector's performance estimating method
The performance of multiple digital partial discharge detection instrument is tested according to Partial discharge detector provided by the invention performance estimating method, this enforcement provides the example of an application testing, and this test is for assessment of the performance of three digital measurement of partial discharge instrument D1, D2 and D3.D1 can detect under bipolar or one pole detecting pattern has software filtering function, D2 is the use for laboratory PDMI based on digital oscilloscope (DSO) and Lab VIEW platform development, D3 comprises an insulation diagnosis program, in order to the Classification and Identification of the aftertreatment and partial discharge pulse that perform data.Three PDMI can to catch single partial discharge pulse signal higher than the sampling rate of 100MS/s.For the performance test of these three PDMS, adopt the indirectly testing circuit in IEC60270 standard, use the capacitor of two 1nF, one as tested object, one as coupling capacitance.The charge injection of generation is coupled to tested object by HF current transformer.
According to open source literature (O.Gunnarsson, A.Bergman, and K.E.Rydler, " A Method for Calibration of Partial Discharge Calibrators; " IEEE Trans.Instrum.Meas., Vol.48, N.2, pp.453-456, Apr.1999) detailed step, adopt monopulse repeat pattern to test three system linearity degree, the polarity effect of impulse response and D2, test findings meets IEC 60270.
1000 pulses are injected in tested object, the pulse height of its sequence, polarity and the time interval be difference stochastic generation in 40 to 200pc and 1000 μ s, and said process repeats with the repetition rate of 0.5 hertz the ability carrying out the complete sequence that testing tool obtains for five times.Instrument D3 can catch 4998 in 5000 pulses.Except a few pulses, the deviation of the quantity of electric charge of measurement result and injection within 5%, time interval deviate in 1 μ s, with the deviation of time interval setting value within 1%.
Internal voids shown in shelf depreciation collection of illustrative plates (as Fig. 5 A) electric discharge of emulation), can be used for assessing the pattern acquiring ability of D1 and D2.Fig. 7 A) show testing result under D1 bipolarity detecting pattern, obviously can see that some detect the pulse polarity obtained incorrect.Fig. 7 B) show the response of D1 under unipolarity detecting pattern.As Fig. 5 B) shown in, under identical testing conditions, D2 provides a more accurate testing result.We are by superimposed with the interference from the power module of notebook computer for the air gap gap of emulation electric discharge collection of illustrative plates, and synchronism output, verifies the exclusive PCR of D3 and identify the ability of shelf depreciation.
Fig. 7 C) be the electric discharge collection of illustrative plates of all pulse shapings gathered.Fig. 7 D) clearly show based on gathered partial discharge pulse TW map (time span and equivalent bandwidth, D3 sorting technique used) time, this collection of illustrative plates can be categorized into two parts.Corresponding to Fig. 7 D) the PRPD collection of illustrative plates of left area is as Fig. 7 E) shown in, Fig. 7 F) show that this electric discharge collection of illustrative plates is identified as internal discharge by D3, Fig. 7 D) part on the right is then confirmed as noise.
The testing result of the shelf depreciation of emulation shown in Fig. 7 collection of illustrative plates:
A), B): D1 measures internal discharge respectively under bipolar and one pole detecting pattern;
C), D): D3 measures the internal discharge pattern of superposition interference;
E), F): D3 differentiates and identifies internal discharge pattern;
G), H): D3 measures compound electric discharge.
The electric discharge collection of illustrative plates that the inside of the D3 collection of Fig. 7 display and creeping discharge combine is produced by artificial defect model in the lab.Be different from Fig. 7 C) collection of illustrative plates simulation data, there is the overlap of a zonule in this Liang Zhong partial discharge pulse on TW figure, and two kinds of pulses be superimposed are not easily distinguishable.But when D3 introduces the distribution density threshold value arrangement of a TW, adopt Fuzzy classification, pulse still can be successfully divided into two classes.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (6)
1. Partial discharge detector's performance estimating method, it is characterized in that, by partial discharge pulse's sequence and the electric discharge collection of illustrative plates thereof of emulation, carry out partial discharge pulse that is virtually reality like reality process, to assess the performance of measurement of partial discharge instrument, wherein, partial discharge pulse's sequence of described emulation is that physical simulation exports;
Wherein, partial discharge pulse's sequence of described emulation realizes physical simulation as follows to export:
Set up shelf depreciation spectrum data storehouse, for the reference source as partial discharge pulse's sequence generator simulation data electric discharge collection of illustrative plates;
By partial discharge pulse's sequence generator, come according to the collection of illustrative plates in described shelf depreciation spectrum data storehouse, export electric discharge collection of illustrative plates with partial discharge pulse's sequential manner;
Arrange trigger circuit, to produce output synchronizing signal, wherein, described synchronizing signal is the triggering that described electric discharge collection of illustrative plates each cycle exports.
2. Partial discharge detector according to claim 1 performance estimating method, is characterized in that, the collection of illustrative plates in described shelf depreciation spectrum data storehouse, have recorded following information:
The shape information of-partial discharge pulse;
The information of-shelf depreciation test;
The characteristic information of each pulse in-partial discharge pulse sequence.
3. Partial discharge detector according to claim 1 performance estimating method, is characterized in that, partial discharge pulse's sequence generator, comprises the series capacitor of waveform generator AWG and the calibration be connected;
Waveform generator AWG is used for producing step voltage according to any one pattern following, and recurrence of laying equal stress on send described step voltage to the series capacitor of described calibration, to export corresponding partial discharge pulse sequence:
-monopulse repeat pattern;
-pulse train pattern;
-dynamic sequence pattern;
Wherein:
In described monopulse repeat pattern, described waveform generator AWG produces program control step voltage, and the series capacitor repeating step voltage to be sent to described calibration is with output pulse sequence; Wherein, described step voltage a), b), c) and d) is made up of the essential part of four successively: a) original levels section, to be value be zero voltage; B) rising edge section; C) voltage maintains section, connects described rising edge section and negative edge section; D) negative edge section;
In described pulse train pattern, described partial discharge pulse sequence generator export pulse rise time be fixed as 1.8 nanoseconds, 2.1 nanoseconds or 4.8 nanoseconds, the time interval of the amplitude of pulse and quantity and adjacent pulse and polarity are obtained or stochastic generation by definition separately, and pulse train exports single or by determining that frequency repeats or triggered by external synchronization signal;
In described dynamic sequence pattern, each pulse train is that the pulse height of the continuous impulse in each synchronizing cycle and the time interval are for dynamically arranging or reading from file by a triggering.
4. Partial discharge detector according to claim 3 performance estimating method, it is characterized in that, in dynamic sequence pattern, first described partial discharge pulse sequence generator reads the pulse train of collection of illustrative plates from described shelf depreciation spectrum data storehouse, wherein, collection of illustrative plates comprises pulse-response amplitude and phase angle; Subsequently the pulse train of this collection of illustrative plates is divided into set of pulses fragment according to power frequency period, the pulse of the corresponding power frequency period of each pulse fragment;
When electric discharge collection of illustrative plates after compiling exports, each pulse fragment triggers by an outer triggering signal; Wait for more than 1 cycle period after exporting, then export the pulse fragment of next simulation.
5. Partial discharge detector according to claim 1 performance estimating method, is characterized in that, described trigger circuit comprise isolating transformer, low-pass filter, comparer;
Isolating transformer coupling civil power, the signal of coupling forms sinusoidal synchronizing signal after low-pass filter, this sinusoidal synchronizing signal produces a square-wave signal in a comparator with after a DC voltage, the rising edge of this square-wave signal, as synchronizing signal, is the triggering that electric discharge collection of illustrative plates each cycle exports.
6. Partial discharge detector according to claim 2 performance estimating method, is characterized in that,
The shape information of-partial discharge pulse is complete partial discharge pulse's waveform, sensors coupled capacitor, High Frequency Current Sensor, superfrequency Wide antenna that wave recording is used;
The information of-shelf depreciation test, the environment of added voltage when comprising collection of illustrative plates test, shelf depreciation type corresponding to collection of illustrative plates, shelf depreciation test and discharge source;
The characteristic information of each pulse in-partial discharge pulse sequence, comprises the amplitude of each pulse, polarity, pulsion phase parallactic angle or the moment of pulse generation, the time and frequency parameter of pulse.
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| CN105607023A (en) * | 2016-01-28 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Pulse signal generation and measurement method for calibration of partial discharge detector |
| CN105911500A (en) * | 2016-06-30 | 2016-08-31 | 杭州西湖电子研究所 | Assessment verifying device and method for on-line ultrahigh-frequency partial discharge monitoring system |
| CN106556770A (en) * | 2016-11-24 | 2017-04-05 | 国网河南省电力公司周口供电公司 | A kind of self-priming leakage monitoring device and monitoring method |
| CN108051640A (en) * | 2017-11-28 | 2018-05-18 | 昆明启发科技有限公司 | A kind of method that alternating current and oil machine power supply are judged based on periodic method frequency |
| CN112912741A (en) * | 2018-10-26 | 2021-06-04 | 赖茵豪森机械制造公司 | State evaluation of an electrical operating device |
| CN110794329A (en) * | 2019-11-08 | 2020-02-14 | 国网湖北省电力有限公司电力科学研究院 | Method for testing defect recognition capability of partial discharge live detector of combined electrical apparatus and switch cabinet |
| CN110794329B (en) * | 2019-11-08 | 2021-07-23 | 国网湖北省电力有限公司电力科学研究院 | Method for testing defect recognition capability of partial discharge live detector of combined electrical apparatus and switch cabinet |
| CN111060786A (en) * | 2019-12-16 | 2020-04-24 | 山东康威通信技术股份有限公司 | Partial discharge generating device and method with adjustable discharge quantity and density based on phase |
| CN111239558B (en) * | 2020-02-06 | 2022-01-25 | 云南电网有限责任公司电力科学研究院 | Online measurement method for equivalent discharge capacity of line fault arc |
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| CN111239559A (en) * | 2020-02-06 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Online measurement method for equivalent discharge capacity of line fault arc |
| CN111239559B (en) * | 2020-02-06 | 2022-04-12 | 云南电网有限责任公司电力科学研究院 | Online measurement method for equivalent discharge capacity of line fault arc |
| CN111781411A (en) * | 2020-07-20 | 2020-10-16 | 广东电网有限责任公司电力科学研究院 | Partial discharge pulse sequence generation method and device |
| CN111856382A (en) * | 2020-07-28 | 2020-10-30 | 红相股份有限公司 | Indirect measuring equipment for sensitivity of high-frequency pulse sensor |
| CN112147445A (en) * | 2020-09-25 | 2020-12-29 | 北京神州泰岳软件股份有限公司 | Partial discharge detection method and system |
| CN112834881A (en) * | 2021-01-05 | 2021-05-25 | 国网福建省电力有限公司厦门供电公司 | Pulse output method of analog partial discharge phase map based on time division multiplexing |
| CN112834881B (en) * | 2021-01-05 | 2024-02-06 | 国网福建省电力有限公司厦门供电公司 | Pulse output method for simulating partial discharge phase spectrum based on time division multiplexing |
| CN112986775A (en) * | 2021-05-12 | 2021-06-18 | 中国电建集团华东勘测设计研究院有限公司 | Active calibration method for partial discharge pulse phase |
| CN114994587A (en) * | 2022-08-04 | 2022-09-02 | 国网江西省电力有限公司电力科学研究院 | Anti-interference energy evaluation method for partial discharge detector |
| CN114994587B (en) * | 2022-08-04 | 2022-12-30 | 国网江西省电力有限公司电力科学研究院 | Energy evaluation method for anti-interference performance of partial discharge detection instrument |
| CN117195050A (en) * | 2023-09-11 | 2023-12-08 | 浙江大学 | Ultrahigh frequency partial discharge omnidirectional detection method and system based on BP neural network |
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