CN104849686B - Partial discharge detector's performance evaluation system - Google Patents
Partial discharge detector's performance evaluation system Download PDFInfo
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- CN104849686B CN104849686B CN201510207011.1A CN201510207011A CN104849686B CN 104849686 B CN104849686 B CN 104849686B CN 201510207011 A CN201510207011 A CN 201510207011A CN 104849686 B CN104849686 B CN 104849686B
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Abstract
The invention provides a kind of Partial discharge detector's performance evaluation system, including：Shelf depreciation spectrum data storehouse, the reference source for the collection of illustrative plates that discharged as partial discharge pulse's sequence generator simulation data；Partial discharge pulse's sequence generator, for the collection of illustrative plates in the shelf depreciation spectrum data storehouse, with partial discharge pulse's sequential manner output electric discharge collection of illustrative plates；Triggers circuit, for producing output synchronizing signal, wherein, the triggering that the synchronizing signal exports for the electric discharge collection of illustrative plates each cycle.The present invention can produce different types of partial discharge pulse's sequence, include the emulation of basic programmable calibration pulse train to the shelf depreciation collection of illustrative plates to different insulative defect model, to meet the requirement that the different nominal performances of different digital measurement of partial discharge instrument are assessed；Their performance is improved available for measurement of partial discharge instrument functional verification, and in the design phase, to reduce required experimental test.
Description
Technical field
The present invention relates to the Performance Evaluation of Partial discharge detector, in particular it relates to Partial discharge detector's Performance Evaluation
System.
Background technology
Measurement of partial discharge is a kind of non-destructive method of effective detection high voltage electric equipment insulation defect.Insulation defect
Presence can strengthen the electric field of regional area around it, so as to cause local insulation breakdown, occur electric charge in the zonule
Fast transfer.Partial Discharge Detection is normally based on the assessment to the electrical quantity in discharge process or non-electrical signal.Many institutes
Known, the generation of shelf depreciation may cause the progressively deterioration of insulation and ultimately result in failure of insulation.Therefore, the inspection of shelf depreciation
Survey, position and diagnose, be to assess high voltage electric equipment insulation status essential work.
At present, measurement of partial discharge instrument (PDMIs, Partial discharge measuring instruments)
The analogue type equipment development that can only measure apparent charge amount from early stage is more to executable PD Pattern Recognition etc.
The digitized instrument of higher level operation.The size of apparent charge amount is only capable of indicating shelf depreciation presence or absence and its order of severity, and
By analyzing between the high voltage in partial discharge pulse's sequence added by the distribution of the amplitude of each pulse and phase angle and test test product
The frequency spectrum of relation (PRPD-phase resolved partial discharge) or partial discharge pulse's waveform, can be obtained
Take more information about triggering shelf depreciation insulation defect.Therefore, many digital partial discharge measuring instruments use data signal
Treatment technology carries out statistics or time frequency analysis to partial discharge pulse's sequence that sampling is obtained, and realizes to local electric discharge type
Classification and identification, while carrying out ELIMINATION OF ITS INTERFERENCE and noise suppressed.
PDMIs Premium Features cause its off-line test of application from laboratory to extend to live live detection and insulation
Diagnosis, constantly proposes new functional requirement in turn.Most of traditional shelf depreciation prover can only be with fixed repetition frequency
The charge pulse of the known discharge capacity of rate output, can may be programmed for characteristics such as the linearity of verification PD meter and polarity effects
Shelf depreciation prover can then carry out the property defined in extra test, such as Sequence Response and pulse resolution standard
Can, and all said process are just for the calibration and assessment of surveyed apparent charge.At present, few standards or determine the step of
Carry out the advanced instrument of assessment performance.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of Partial discharge detector's Performance Evaluation system
System.The present invention originally proposes Partial discharge detector's performance evaluation system on the basis of programmable shelf depreciation prover.This
Invention can have the pulse train of true shelf depreciation collection of illustrative plates statistical nature with physical simulation.
A kind of Partial discharge detector's performance evaluation system provided according to the present invention, including：Shelf depreciation spectrum data
Storehouse, partial discharge pulse's sequence generator, triggers circuit；
The shelf depreciation spectrum data storehouse, for being discharged as partial discharge pulse's sequence generator simulation data
The reference source of collection of illustrative plates；
Partial discharge pulse's sequence generator, for the collection of illustrative plates in the shelf depreciation spectrum data storehouse, with part
Discharge pulse sequential manner output electric discharge collection of illustrative plates；
Triggers circuit, for producing output synchronizing signal, wherein, the synchronizing signal is defeated for the electric discharge collection of illustrative plates each cycle
The triggering gone out.
Preferably, the collection of illustrative plates in the 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, including the waveform generator AWG being connected and the series electrical of calibration
Container；
Waveform generator AWG is used to produce step voltage according to following any pattern, and the step electricity is sent in recurrence of laying equal stress on
The series capacitor of the calibration is pressed onto, to export corresponding partial discharge pulse's sequence：
- pulse repeat pattern；
- pulse train pattern；
- dynamic sequence pattern；
Wherein：
In the pulse repeat pattern, the waveform generator AWG produces program control step voltage, and by step voltage
Repetition is sent to the series capacitor of the calibration with output pulse sequence；Wherein, the step voltage is by four bases successively
This part a), b), c) and d) composition：A) original levels section, is the voltage that value is zero；B) rising edge section；C) voltage maintains section,
Connect the rising edge section and trailing edge section；D) trailing edge section；
In the pulse train pattern, the rise time that partial discharge pulse's sequence generator exports pulse consolidates
It is set to 1.8 nanoseconds, 2.1 nanoseconds or 4.8 nanoseconds, the amplitude and quantity of pulse and the time interval and polarity of adjacent pulse pass through
Individually definition is obtained or generated at random, and pulse train exports single and repeats or touched by external synchronization signal by determination frequency
Hair；
In the dynamic sequence pattern, each pulse train is the company in each synchronizing cycle by being triggered one
The impulse amplitude and time interval of continuous pulse set for dynamic or read from file.
Preferably, in dynamic sequence pattern, partial discharge pulse's sequence generator is first from the shelf depreciation
The pulse train of collection of illustrative plates is read in spectrum data storehouse, wherein, collection of illustrative plates includes pulse amplitude and phase angle；Then by the collection of illustrative plates
Pulse train is divided into set of pulses fragment, the pulse of one power frequency period of each pulse fragment correspondence according to power frequency period；
When electric discharge collection of illustrative plates after compiled is exported, each pulse fragment is triggered by an outer triggering signal；Output
More than one (such as 2 or 3) cycle period is waited afterwards, then exports the pulse fragment of next simulation.
Preferably, the triggers circuit includes isolating transformer, low pass filter, comparator；
Isolating transformer, which is coupled, forms sinusoidal synchronizing signal after civil power, the low-pass filtered device of signal of coupling, the sine is same
Step signal produces a square-wave signal after being compared in a comparator with a DC voltage, and the rising edge of the square-wave signal is used as synchronization
Signal, the triggering for collection of illustrative plates each cycle output of as discharging.
Preferably：
The shape information of-partial discharge pulse, is complete partial discharge pulse's waveform, the sensor used in wave recording
Coupled capacitor device, High Frequency Current Sensor, superfrequency Wide antenna；
The information of-shelf depreciation test, including added voltage during collection of illustrative plates test, the shelf depreciation class corresponding to collection of illustrative plates
Type, the environment of shelf depreciation test and discharge source；
The characteristic information of each pulse in-partial discharge pulse sequence, includes amplitude, polarity, the pulsion phase parallactic angle of each pulse
Or at the time of pulse generation, the time and frequency parameter of pulse.
Compared with prior art, the present invention has following beneficial effect：
1st, the present invention can produce different types of partial discharge pulse's sequence, including basic programmable calibration pulse sequence
The emulation to the shelf depreciation collection of illustrative plates of different insulative defect model is arranged, to meet the different nominal performances of different digital PDMIs
The requirement of assessment.
2nd, the present invention can be used for PDMI functional verifications, and improve in the design phase their performance, with needed for reducing
Experimental test.
3rd, application of the present invention to PDMI performance evaluations shows the potentiality of its development.Invention demonstrates a method it to measuring instrument
The specific function of some of device, such as basic performance records the ability of whole pulse train, to sampling pulse amplitude and time interval
Precision, validity and bipolarity of the electric discharge collection of illustrative plates pattern-recognition under local discharge signal noise existence condition detects and played a game
Portion's electric discharge collection of illustrative plates classification, is tested.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the partial discharge collection of illustrative plates that three kinds of shelf depreciation simulation models are produced；
Fig. 2 is Partial discharge detector's performance evaluation system structure chart；
Fig. 3 is generation step voltage waveform figure；
Fig. 4 is the dynamic pulse sequence example in three triggering cycles；
Fig. 5 be 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
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
Digital PD meter Performance Evaluation requirement
Being mainly characterized by of digital partial discharge measuring instrument (PDMI) can store acquired shelf depreciation time domain waveform
Or related characteristic parameter, time of origin, apparent charge amount such as each partial discharge pulse, relative to added test voltage
Phase angle.These information are all obtained from the core component of instrument, digitizer (AD-analogue to digital
Convertor), whole instrument also includes the analog signal pretreatment unit before AD and digitlization post-processing unit composition.
Analogue type PDMI characteristic test is completely defined in related standard, for some performed on digital P DMI
The test of additional functionality, standard only provides some of the recommendations.Based on the program of analog PDMI performance tests, it is considered to have
The digital P DMI of additional function Performance Evaluation, following Test Suggestion should be included with interior：
(1) tested according to the basic performance of IEC60270 standards, such as linearity, pulse resolving time, impulse response, polarity
Effect.
(2) record of partial discharge pulse's sequence response of each partial discharge pulse is verified, its phase angle is examined and shakes
Whether width is accurate.
(3) advance and the assessment of validity of instrument are post-processed to sampled data.
The test advised for above-mentioned (1) item, some have additional function, such as export programmable partial discharge pulse sequence
The prover of row just can be implemented.Applicant previously just develop and apply a programmable shelf depreciation prover (referring to
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 for assessing digital P DMI concentrates on two suggestions next
Test.The condition of the two tests is met, is considered as detecting PDMI survey using the shelf depreciation generated at random a sequence
Test acquisition ability.Therefore, being that checking is digital using a real partial discharge pulse sequence associated with known defect
The optimal selection of PDMIs performances (such as shelf depreciation classification and identification).
The method for generating true partial discharge pulse's sequence at present is substantially based on partial discharge model or true type electric power
Equipment test is obtained.This needs an application high voltage power supply, and prepares necessary shelf depreciation defect model, this be one very
Difficult task.Therefore, turned into using a system that can simulate partial discharge pulse's sequence and realize that digital P DMI performances are commented
A kind of very promising method estimated.Most important benefit using partial discharge pulse's series model system is that do not having
It can reappear partial discharge pulse's sequence in the case of having high-voltage power supply, and each partial discharge pulse in the pulse train has
The amplitude of determination and phase angle, but its again have and actual partial discharge phenomenon identical statistical property.
Consider in above-mentioned factor, digital P DMI performance evaluation systems there need to be following functions：
(1) programmable partial discharge pulse sequence, the electric discharge amplitude of pulse train, continuous partial discharge pulse can be exported
Between time interval, repetition rate can set, tested with carrying out the related basic performances of PDMI；
(2) each pulse that can be exported in random partial discharge pulse's sequence, pulse train has random length, at random
Amplitude and 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 of output, the collection of illustrative plates of emulation is not
With the reflection of the true stochastic behaviour of electric discharge phenomena, such as validity to test PDMI related tools, disturbance ecology, shelf depreciation
Classification and identification.
Based on above-mentioned analysis, applicant develops a PDMI performance evaluation systems, and the system is main by a shelf depreciation figure
Modal data storehouse and partial discharge pulse's sequence generator and its triggers circuit composition.Shelf depreciation spectrum data storehouse is shelf depreciation
The reference source of pulse sequence generator simulation data PRPD collection of illustrative plates.
The structure in shelf depreciation spectrum data storehouse
It is well known that different types of defect has the statistical property of different burst length distributions and distribution of amplitudes, this source
In the mechanism of production of shelf depreciation.We are typically classified and recognized insulation defect using this species specificity, and these defects can divide
For 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 pass through
Three approach is collected：Shelf depreciation live detection, the digital simulation based on mathematical modeling and the emulation based on typical defect
Experiment.
In measurement of partial discharge at the scene, it is determined that the defect type of detected shelf depreciation collection of illustrative plates needs to find defect
Source, generally requires disintegration power equipment or even insulating materials of cutting into slices.Obtaining typical shelf depreciation pattern in this way needs
Undergo a very long accumulation.
Shelf depreciation collection of illustrative plates Digital Simulation is a kind of very promising electric discharge collection of illustrative plates production method.Certain form of part is put
The existing mathematical modeling of electrograph spectrum, the amplitude and phase distribution of its apparent charge are studied in detail.For example, in low pressure and two electrodes
In the case that distance is shorter, Paschen curves explain negative corona phenomenon (correspondence point discharge) well, and insulating inner gas
Gap electric discharge is often described by simplified Whitehead models.Consider shelf depreciation electric charge produce and the random process that disappears with
And the influence of machining area, then a more accurate simulation model is needed, dielectric characteristic in discharge environment is further considered, lacks
The factors such as sunken physical form, a more complicated simulation model has carried out mathematical description to this, and digital simulation is that generation is local
A kind of flexi mode of electric discharge.But, it is contemplated that the complexity of the process of shelf depreciation, in addition it is also necessary to tested to simulation result
Checking.
The method for collecting typical shelf depreciation collection of illustrative plates most convenient is to carry out simulation electric discharge by artificial defect model, by it
The shelf depreciation collection of illustrative plates of analog simulation can be obtained.If Fig. 1 is respectively to simulated interior, along face and point discharge defect three
Discharging model, based on measurement of partial discharge circuit in standard, the electric discharge collection of illustrative plates recorded using digital oscilloscope.
Insulating inner partial discharge model is to insert multilayer insulation thin layer between two flat metal electrodes to build, its
The a certain insulating barrier of centre contains an artificial cavities, applies certain power between electrode, and applied one layer on the surface of electrode
Insulating oil is to avoid the presence of other air gaps.The characteristic of insulating inner defect can be by changing the thickness or cavity of insulating barrier
Shapes and sizes are adjusted.
The generation of creeping discharge is by tiltedly placing the variable pointed metal needle of diameter on a thin insulating trip come real
Existing, high voltage is applied between pin and ground connection plate electrode under insulating barrier.
Sophisticated (corona) electric discharge collection of illustrative plates then by corona unit or point to plate electrode (change prong end diameter and
Point arrives plan range) obtain.
The system of Partial discharge detector's performance evaluation system is set
Partial discharge detector's performance evaluation system, its structure such as Fig. 2, including a shelf depreciation spectrum data
Storehouse, the triggers circuit of synchronization and partial discharge pulse's sequence generator.
Shelf depreciation spectrum data storehouse is the electric discharge figure obtained by the construction method in above-mentioned shelf depreciation spectrum data storehouse
The set of spectrum, in addition to the shape information of discharge pulse, be also recorded for shelf depreciation test information (for example, measuring circuit and
Instrument, test film and the voltage applied), while being also extracted the spies such as the amplitude and phase of each pulse of partial discharge pulse's sequence
Reference ceases.
Partial discharge pulse's sequence can be reproduced by partial discharge pulse's sequence generator, as shown in Fig. 2 shelf depreciation
Pulse sequence generator is main to be made up of one electric capacity stroke by calibration of AWG (AWG) block coupled in series.This
Individual 200MS/s 16 AWG modules have 256MB memory on board, and the Lab VIEW in embedded controller are arranged on by one
Programme-control.AWG modules and controller are placed on a compact PXIe (PCI extends instrument) and by PCI Express
Bus is connected.
When system simulation produces PRPD collection of illustrative plates, output is synchronous to be produced by a triggers circuit, and the triggers circuit is mainly used to
Simulate " high voltage " signal.It couples civil power by an isolating transformer, forms sinusoidal after the signal of coupling is low-pass filtered
Synchronizing signal, the sinusoidal synchronizing signal produces a square-wave signal after being compared with a DC voltage, the rising edge of the square wave is
The triggering that collection of illustrative plates each cycle of discharging is exported.By changing DC reference voltage, trigger signal and synchronizing signal rising edge zero crossing
Between phase difference can realize 0 degree to 90 degree adjustment.Simulation " high voltage " signal then comes from the amplification of synchronizing signal.
The systemic-function of Partial discharge detector's performance evaluation system
Partial discharge detector's performance evaluation system, can produce pulse train in Three models：
- pulse repeat pattern；
- pulse train pattern；
- dynamic sequence pattern.
In pulse repeat pattern, AWG produces program control step voltage, and recurrence of laying equal stress on is sent to the series capacitor of calibration with defeated
Go out the pulse train of needs.The step voltage of generation is made up of four essential parts as shown in Figure 3：A) original levels, this is
The voltage that the value being connected with step voltage is zero；B) rapid increase edge, produces dash current and determines simulated spectrum；C) high voltage
Maintain, connect rapid increase edge above and D sections (i.e. trailing edge section)；D) slow trailing edge, slight slope is to keep away
Exempt from inverted pulse appearance.It is described slowly with the express delivery comparatively.Rising edge is described by a hyperbolic tangent function, so may be used
Avoid the overvoltage after voltage rapid increase.Under pulse repeat pattern, produced step voltage parameter (amplitude, during rising
Between, pulse recurrence frequency and polarity) real-time setting and to update realized by user interface shown in Fig. 3.The electric charge of generation
Scope from 0.5 to 1000PC, step voltage most short nanosecond of rapid increase about 30, repetition rate can be set in 0.1 hertz and arrive
50 kilo hertzs.The pulse repeated can be used for test PDMI some basic performance (linearity, polar response, impulse response and arteries and veins
Rush resolution ratio).
When assessment system operates in pulse train pattern, the output that rise time of output pulse selects according to AWG modules
Amplifying stage is fixed as 1.8 nanoseconds, 2.1 nanoseconds or 4.8 nanoseconds.Pulse amplitude and quantity and their time interval and polarity can
Individually to define or generate at random, the maximum length of pulse train is limited only in the size of internal system memory space, produced
Pulse train can export single by determining that frequency repeats or triggered by external synchronization signal (being typically that power supply is related).
Using known amplitude and the pulse train of time interval, we can enter to PMDI pulse amplitude and the acquisition precision of phase
Row test.
In dynamic pulse pattern, each pulse train be by one trigger, can be by software design patterns or by external trigger
(trigger signal of synchronous circuit as described above).The impulse amplitude and time interval of continuous impulse in each synchronizing cycle
Mobile state can be entered to set or read from file.Fig. 4 gives the output example of the dynamic pulse sequence containing three synchronizing cycles.
Dynamic sequence pattern mainly by emulating shelf depreciation PRPD collection of illustrative plates, carrys out check and evaluation PDMI Premium Features.
Under this application, program reads pulse train (including pulse amplitude and the phase angle of selected PRPD collection of illustrative plates from database
Value).The subsequent sequence is divided into set of pulses fragment, the arteries and veins of one power frequency period of each pulse fragment correspondence according to power frequency period
Punching.During the PRPD collection of illustrative plates output of compiling, each pulse fragment is triggered by an outer triggering signal；2 to 3 are waited after output
Individual cycle period, then export the pulse fragment of next simulation.It is this delay be in order to ensure system export pulse fragment not
It is overlapping.Fig. 5 gives the PRPD collection of illustrative plates of a simulation data and the contrast of its data source in database.The PRPD collection of illustrative plates
Collection is recorded by a PDMI coupled with High Frequency Current Sensor, the shelf depreciation collection of illustrative plates of simulation data be by one by
According to the high bandwidth PDMI measurements of calibration, the high similarity between two PRPD collection of illustrative plates distributions demonstrates digital shelf depreciation instrument
The PRPD collection of illustrative plates copyings of performance evaluation system.
By using dynamic pulse pattern, different PRPD patterns can be added to a single pulse output sequence
Row, the presence to simulate multiple Partial Discharge Sources or interference and noise.
The system application of Partial discharge detector's performance evaluation system
Multiple digital partial discharge detections are tested according to Partial discharge detector's performance evaluation system that the present invention is provided
The performance of instrument, this implementation provides the example of once application test, and this time is tested for assessing three digital measurement of partial discharge instrument
Device D1, D2 and D3 performance.D1 can detect that with software filtering function D2 is based on number under bipolar or monopole detection pattern
The use for laboratory PDMI of word formula oscillograph (DSO) and Lab VIEW platform developments, D3 includes an insulation diagnosis program, to perform
The post processing of data and the Classification and Identification of partial discharge pulse.Three PDMI can be captured with the sample rate higher than 100MS/s
Single partial discharge pulse's signal.For these three PDMS performance test, using the indirectly testing electricity in IEC60270 standards
Road, using two 1nF capacitor, one as test object, one is used as coupled capacitor.The electric charge of generation is injected into survey
Examination object is simultaneously coupled 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, three systems are tested using pulse repeat pattern
The linearity, impulse response and D2 polarity effect, result of the test meet IEC 60270.
1000 pulses are injected into test object, the impulse amplitude of its sequence, polarity and time interval from 40 to
Random generation respectively in 200pc and 1000 μ s, said process repeats five times with 0.5 hertz of repetitive rate and carrys out tester acquisition
The ability of complete sequence.Instrument D3 can capture 4998 in 5000 pulses.Except a few pulses, measurement result and injection
The quantity of electric charge deviation within 5%, time interval deviation in 1 μ s, and time interval setting value deviation 1% with
It is interior.
Shown in the shelf depreciation collection of illustrative plates (such as Fig. 5 A) of emulation internal voids electric discharge), can for assess D1 and D2 mould
Formula acquisition capability.Fig. 7 A) testing result under D1 bipolarity detection patterns is shown, it can clearly be seen that what some detections were obtained
Pulse polarity is incorrect.Fig. 7 B) show responses of the D1 under unipolarity detection pattern.Such as Fig. 5 B) shown in, in identical test
Under the conditions of, D2 provides a more accurate testing result.The air gap gap of emulation is discharged collection of illustrative plates with coming from notebook electricity by us
The interference of the power module of brain is superimposed, synchronism output, to verify D3 exclusive PCR and the ability of identification shelf depreciation.
Fig. 7 C) be collection all pulse shapings electric discharge collection of illustrative plates.Fig. 7 D) clearly show based on the shelf depreciation gathered
During TW map (time span and equivalent bandwidth, the sorting technique used in D3) of pulse, this collection of illustrative plates can be categorized into two parts.It is right
Should be in Fig. 7 D) PRPD collection of illustrative plates such as Fig. 7 E of left area) shown in, Fig. 7 F) show that this electric discharge collection of illustrative plates is identified as inside by D3 and put
Electricity, Fig. 7 D) on the right of part be then confirmed as noise.
The testing result of emulation shelf depreciation collection of illustrative plates shown in Fig. 7：
A), B)：D1 measures internal discharge under bipolar and monopole detection pattern respectively；
C), D)：The internal discharge pattern of D3 measurement superposition interference；
E), F)：D3 is differentiated and identification internal discharge pattern；
G), H)：The compound electric discharge of D3 measurements.
The electric discharge collection of illustrative plates that the inside for the D3 collections that Fig. 7 is shown and creeping discharge are combined is in the lab by artificial defect mould
What type was produced.Be different from Fig. 7 C) collection of illustrative plates simulation data, there are the weight of a zonule in both partial discharge pulses on TW figures
It is folded so that two kinds of pulses being superimposed are not easily distinguishable.But when the D3 distribution density threshold values for introducing a TW are arranged, adopt
With Fuzzy classification, pulse still can be successfully divided into two classes.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (5)
1. a kind of Partial discharge detector's performance evaluation system, it is characterised in that including：Shelf depreciation spectrum data storehouse, part
Discharge pulse sequence generator, triggers circuit；
The shelf depreciation spectrum data storehouse, for being used as partial discharge pulse's sequence generator simulation data electric discharge collection of illustrative plates
Reference source；
Partial discharge pulse's sequence generator, for the collection of illustrative plates in the shelf depreciation spectrum data storehouse, with shelf depreciation
Pulse train mode exports electric discharge collection of illustrative plates；
Triggers circuit, for producing output synchronizing signal, wherein, the synchronizing signal is the electric discharge collection of illustrative plates each cycle output
Triggering；
Partial discharge pulse's sequence generator, including the waveform generator AWG being connected and the series capacitor of calibration；
Waveform generator AWG is used to produce step voltage according to following any pattern, and recurrence of laying equal stress on send the step voltage to arrive
The series capacitor of the calibration, to export corresponding partial discharge pulse's sequence：
- pulse repeat pattern；
- pulse train pattern；
- dynamic sequence pattern；
Wherein：
In the pulse repeat pattern, the waveform generator AWG produces program control step voltage, and step voltage is repeated
The series capacitor of the calibration is sent to output pulse sequence；Wherein, the step voltage is by four basic portion successively
Divide and a), b), c) and d) constitute：A) original levels section, is the voltage that value is zero；B) rising edge section；C) voltage maintains section, connection
The rising edge section and trailing edge section；D) trailing edge section；
In the pulse train pattern, the rise time that partial discharge pulse's sequence generator exports pulse is fixed as
1.8 nanoseconds, 2.1 nanoseconds or 4.8 nanoseconds, the amplitude and quantity of pulse and the time interval and polarity of adjacent pulse pass through independent
Definition is obtained or generated at random, and pulse train exports single and repeats or triggered by external synchronization signal by determination frequency；
In the dynamic sequence pattern, each pulse train is the continuous arteries and veins in each synchronizing cycle by being triggered one
The impulse amplitude and time interval of punching set for dynamic or read from file.
2. Partial discharge detector's performance evaluation system according to claim 1, it is characterised in that the shelf depreciation figure
Collection of illustrative plates in modal 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's performance evaluation system according to claim 1, it is characterised in that in dynamic sequence pattern
In, partial discharge pulse's sequence generator reads the pulse sequence of collection of illustrative plates first from the shelf depreciation spectrum data storehouse
Row, wherein, collection of illustrative plates includes pulse amplitude and phase angle；The pulse train of the collection of illustrative plates is then divided into one according to power frequency period
Group pulse fragment, the pulse of one power frequency period of each pulse fragment correspondence；
When electric discharge collection of illustrative plates after compiled is exported, each pulse fragment is triggered by an outer triggering signal；After output etc.
More than one cycle period is treated, then exports the pulse fragment of next simulation.
4. Partial discharge detector's performance evaluation system according to claim 1, it is characterised in that the triggers circuit bag
Include isolating transformer, low pass filter, comparator；
Isolating transformer, which is coupled, forms sinusoidal synchronizing signal after civil power, the low-pass filtered device of signal of coupling, the sine is synchronously believed
A square-wave signal is produced after number being compared in a comparator with a DC voltage, the rising edge of the square-wave signal is used as synchronous letter
Number, the triggering for collection of illustrative plates each cycle output of as discharging.
5. Partial discharge detector's performance evaluation system according to claim 2, it is characterised in that
The shape information of-partial discharge pulse, is complete partial discharge pulse's waveform, the sensor coupling used in wave recording
Capacitor, High Frequency Current Sensor, superfrequency Wide antenna；
The information of-shelf depreciation test, including added voltage during collection of illustrative plates test, the shelf depreciation type corresponding to collection of illustrative plates, office
The environment and discharge source of portion's discharge test；
The characteristic information of each pulse in-partial discharge pulse sequence, including the amplitude of each pulse, polarity, pulsion phase parallactic angle or
At the time of pulse generation, the time and frequency parameter of pulse.
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