CN106771919A - The peak value time width phase spectrogram building method of pulse current waveform half and device - Google Patents
The peak value time width phase spectrogram building method of pulse current waveform half and device Download PDFInfo
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- CN106771919A CN106771919A CN201611198142.9A CN201611198142A CN106771919A CN 106771919 A CN106771919 A CN 106771919A CN 201611198142 A CN201611198142 A CN 201611198142A CN 106771919 A CN106771919 A CN 106771919A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The present invention relates to a kind of peak value time width phase spectrogram building method of pulse current of PD waveform half and device, the building method includes：The step of acquisition parameter is set；The step of pulse current of PD waveform time sequence acquisition is carried out with the acquisition parameter, based on ultra wide band detection technique；Half peak value time width, and the step of half peak value time width time series of acquisition are extracted from the pulse current of PD waveform；The step of half peak value time width time series being converted into half peak value time width phase sequence, and is carried out half-peak value time width phase sequence spectrogram and is shown.Compared with prior art, the present invention has the advantages that simple, practicality, can obtain more rich shelf depreciation information.
Description
Technical field
The present invention relates to the shelf depreciation information processing technology, more particularly, to a kind of peak value time width of pulse current waveform half-
Phase spectrogram building method and device.
Background technology
When Partial Discharge Detection is carried out to insulation of electrical installation (paper oil insulation, gas-insulated etc.), it is assumed that preferable
Under noise eliminating technology, for there is (bag during many partial discharge sources in the detection based on partial discharge pulse's peak value-time (phase) sequence
Containing two), the partial discharge data that system is obtained will be the peak value-phase sequence (PRPD) of random aliasing.Inside insulation of electrical installation
The Partial Discharge Sources of presence are unknown, but under the operating mode of Partial Discharge Sources stabilization, the transmission path being made up of detecting system
It is to determine.The pulse current time domain waveform that different discharge sources or signal interference source are formed on detecting system loop has larger
Difference, but only then be cannot be distinguished by by amplitude.Widely use at present, traditional PRPD spectrograms have been not enough to represent comprising more
Useful information, the operating mode for being also not used to process many partial discharge sources or stochastic pulse interference source.
The content of the invention
The purpose of the present invention is exactly a kind of simple, practicality to be provided for the defect for overcoming above-mentioned prior art to exist, is obtained
Obtain data volume abundant the peak value time width of pulse current waveform half-phase spectrogram building method and device.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of peak value time width of pulse current of PD waveform half-phase spectrogram building method, including：
The step of acquisition parameter is set；
Pulse current of PD waveform-time series is carried out with the acquisition parameter, based on ultra wide band detection technique to adopt
The step of collection；
Half peak value time width is extracted from the pulse current of PD waveform, and obtains half peak value time width-time series
The step of；
The half peak value time width-time series is converted into half peak value time width-phase sequence, and carry out half-peak value time width-
The step of phase sequence spectrogram shows.
Also include：
The step stored to the pulse current of PD waveform-time series and half peak value time width-time series
Suddenly.
The half peak value time width of being extracted from the pulse current of PD waveform is specially：
According to 2 points of linear equations of formation of a% at pulse current waveform rising edge and b%, calculate pulse current waveform and regard
The corresponding time t at zero point0：Wherein, tA%、tB%A% and b% respectively at rising edge
Corresponding time, AA%、AB%The corresponding amplitudes of a% and b% respectively at rising edge, a ＞ b；
Calculate the peak value time width t of pulse current waveform halfw：tw=t50%-t0, wherein, t50%0.5A in pulse current waveformpeak
Locate corresponding 2nd time, ApeakIt is pulse current waveform peak value.
The a and b difference values are 90 and 10.
A kind of peak value time width of pulse current of PD waveform half-phase spectrogram constructing apparatus, including：
Setup module, for setting acquisition parameter；
Acquisition module, for carrying out pulse current of PD ripple with the acquisition parameter, based on ultra wide band detection technique
Shape-time series collection；
Extraction module, for extracting half peak value time width from the pulse current of PD waveform, and obtains half peak value
Time width-time series；
Spectrogram generates display module, for the half peak value time width-time series to be converted into half peak value time width-phase sequence
Row, and carry out half-peak value time width-phase sequence spectrogram displaying.
Also include：
Memory module, for the pulse current of PD waveform-time series and half peak value time width-time series
Stored.
The extraction module includes：
Zero crossing time computing unit, for according to 2 points of straight line sides of formation of a% at pulse current waveform rising edge and b%
Journey, calculates corresponding time t at pulse current waveform apparent zero point0：Wherein, tA%、tB%Point
Wei not a% and b% corresponding times, A at rising edgeA%、AB%The corresponding amplitudes of a% and b% respectively at rising edge, a ＞ b；
Half peak value time width computing unit, for calculating the peak value time width t of pulse current waveform halfw：tw=t50%-t0, wherein,
t50%0.5A in pulse current waveformpeakLocate corresponding 2nd time, ApeakIt is pulse current waveform peak value.
In the zero crossing time computing unit, a and b difference values are 90 and 10.
One kind realizes discharge source based on the peak value time width of above-mentioned pulse current of PD waveform half-phase spectrogram building method
Mirror method for distinguishing, including：
Obtain half peak value time width-phase sequence spectrogram；
Go out Partial Discharge Sources, and judge whether interference source according to the half peak value time width-phase sequence mass spectrum database.
Compared with prior art, the invention has the advantages that：
(1) present invention devises the construction process of the peak value time width of pulse current of PD waveform half-phase sequence spectrogram,
Simply, it is practical；
(2) the half peak value time width-phase sequence spectrogram obtained by the inventive method includes abundant shape information；
(3) half peak value time width-phase sequence spectrogram of the invention can be advantageously used in many partial discharge sources and disturbing pulse source
Analysis.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the inventive method；
Fig. 2 is the structural representation of apparatus of the present invention；
Fig. 3 is the schematic diagram based on ultra wide band detection technique acquisition pulse current waveform-time series of the present invention；
Fig. 4 is that the peak value time width of impulse waveform of the present invention half extracts schematic diagram；
Fig. 5 is the schematic diagram that the inventive method is used for test result analysis.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed implementation method and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Traditional phase-resolved partial discharge (PRPD) spectrogram has been not enough to represent comprising more
Useful information, the operating mode for being also not used to process many partial discharge sources or stochastic pulse interference source.The present invention is tried hard to from practical application
Set out, overcome existing PRPD spectrograms to lose the weak point compared with multi information, propose a kind of pulse current of PD waveform half-peak
Value time width-phase spectrogram building method.As shown in figure 1, the building method includes：
In step 101, acquisition parameter is set, local putting is carried out with the acquisition parameter of setting, based on ultra wide band detection technique
Electric pulse current waveform-time series collection；
In step 102, the pulse current of PD waveform-time series to gathering is stored；
In step 103, extract half peak value time width from pulse current of PD waveform, and obtain half peak value time width-when
Between sequence；
In step 104, half peak value time width-time series is converted into half peak value time width-phase sequence, and carry out half-peak value
Time width-phase sequence phase-resolved half-peak-time (PRHPT) spectrogram displaying.Half peak value that the method is obtained
Time width-phase sequence spectrogram can be compared analysis with traditional PRPD spectrograms.
Be illustrated in figure 3 carries out pulse current of PD waveform-time series collection based on ultra wide band detection technique
A kind of implementation method.In the implementation method, test product is tested with detection impedance ZmOne end connects, and detects impedance ZmThe other end is grounded, should
Detection impedance ZmResponsive bandwidth need to reach ns grades, the time domain waveform of the pulse current of PD that will not distort, and the implementation method
The sample rate of the middle ultra wide band high-speed pulse tape deck for using need to 100MS/s and more than, analog bandwidth 50M and more than, note
The pulse current waveform of address book stored-time series P (tj) be defined as follows：
Note：J --- j-th pulse current；
tj--- j-th pulse current waveform record time (μ s gather the moment)；
K --- each impulse waveform is made up of k point；
pi--- the corresponding amplitude (mA/mV) of i-th point of pulse current waveform；
I-th point of Δ t (i-1) --- the pulse current waveform corresponding time (ns, Δ t are sampling time interval).
In other embodiments of the invention, impedance Z is detectedmCoupled capacitor device low-voltage arm electric capacity C can be serially connected in2With earth mat it
Between, detect impedance ZmAlso can transform to the high frequency low current detection sensor such as Rogowski coil, noninductive resistance.
In described step 103, half peak value time width is extracted from pulse current of PD waveform and is specially：
According to 2 points of linear equations of formation of a% at pulse current waveform rising edge and b%, calculate pulse current waveform and regard
The corresponding time t at zero point0：Wherein, tA%、tB%Respectively a% is corresponding with b% at rising edge
Time (ns), AA%、AB%The corresponding amplitudes of a% and b% respectively at rising edge, a ＞ b；
Calculate the peak value time width t of pulse current waveform halfw：tw=t50%-t0, wherein, t50%0.5A in pulse current waveformpeak
Locate corresponding 2nd time (ns), ApeakIt is pulse current waveform peak value, Apeak(j)=max (P (tj)), wherein, j is j-th
Pulse current；Max is the maximum (mA/mV) of pulse current waveform.
The value of a and b can be arranged as required to, and this is implemented in you, and a and b is taken as 90 and 10 respectively.
In the present invention, when the conversion of m- phase sequence be defined as：
Apeak(φj)=Apeak(tj)
φj={ (tj/20)-QZ[(tj/20)]}×360
Note：J --- j-th pulse current；
φj--- j-th pulse current waveform gathers corresponding phase (°)；
QZ --- round numbers.
As shown in Fig. 2 the present embodiment also provides a kind of peak value time width of pulse current of PD waveform half-phase spectrogram structure
Make device 2, including setup module 201, acquisition module 202, extraction module 203, spectrogram generation display module 204 and memory module
205, wherein, setup module 201 is used to set acquisition parameter；Acquisition module 202 is used for the acquisition parameter of setting, based on ultra-wide
Band detection technique carries out pulse current of PD waveform-time series collection；Extraction module 203 is used for from partial discharge pulse
Half peak value time width is extracted in current waveform, and obtains half peak value time width-time series；Spectrogram generation display module 204 is used for will
Half peak value time width-time series is converted into half peak value time width-phase sequence, and carries out half-peak value time width-phase sequence spectrogram exhibition
Show；Memory module 205 is used to deposit pulse current of PD waveform-time series and half peak value time width-time series
Storage.
The peak value time width of above-mentioned pulse current of PD waveform half-phase spectrogram building method can be used to realize that discharge source is reflected
Not, go out Partial Discharge Sources, and judge whether interference source according to half peak value time width-phase sequence mass spectrum database.As Fig. 5 shows
The building method is used for the analysis result of high pressure hall partial discharge test.Pulse current waveform-the time obtained to detection
Sequence obtains the PRHPT spectrograms of neotectonics after flow processing as shown in Figure 1, is compared with traditional PRPD.PRPD spectrograms
Be cannot be distinguished by amplitude distribution with the presence or absence of 2 partial discharge pulse sources, but be clearly present in the half peak value time width distribution of PRHPT
2 kinds of clocks, a kind of half peak value time width distributed area of clock is [60,80] ns, and its typical pulse shape is as depicted
Time domain waveform 1, and half peak value time width distributed area of another clock is [40,60] ns, its typical pulse shape is as schemed
The time domain waveform 2 shown.According to the half peak value time width distributed area of PRHPT, classification has obtained 2 traditional PRPD_1 and PRPD_2
Spectrogram, represents two Partial Discharge Sources respectively.
Claims (9)
1. the peak value time width of a kind of pulse current of PD waveform half-phase spectrogram building method, it is characterised in that including：
The step of acquisition parameter is set；
Pulse current of PD waveform-time series collection is carried out with the acquisition parameter, based on ultra wide band detection technique
Step；
Half peak value time width is extracted from the pulse current of PD waveform, and obtains the step of half peak value time width-time series
Suddenly；
The half peak value time width-time series is converted into half peak value time width-phase sequence, and carries out half-peak value time width-phase
The step of sequence spectrogram shows.
2. the peak value time width of pulse current of PD waveform according to claim 1 half-phase spectrogram building method, it is special
Levy and be, also include：
The step of being stored to the pulse current of PD waveform-time series and half peak value time width-time series.
3. the peak value time width of pulse current of PD waveform according to claim 1 half-phase spectrogram building method, it is special
Levy and be, the half peak value time width of being extracted from the pulse current of PD waveform is specially：
According to 2 points of linear equations of formation of a% at pulse current waveform rising edge and b%, pulse current waveform apparent zero is calculated
Corresponding time t at point0：Wherein, tA%、tB%Respectively a% is corresponding with b% at rising edge
Time, AA%、AB%The corresponding amplitudes of a% and b% respectively at rising edge, a ＞ b；
Calculate the peak value time width t of pulse current waveform halfw：tw=t50%-t0, wherein, t50%0.5A in pulse current waveformpeakPlace is right
The 2nd time, A answeredpeakIt is pulse current waveform peak value.
4. the peak value time width of pulse current of PD waveform according to claim 3 half-phase spectrogram building method, it is special
Levy and be, a and b difference values are 90 and 10.
5. the peak value time width of a kind of pulse current of PD waveform half-phase spectrogram constructing apparatus, it is characterised in that including：
Setup module, for setting acquisition parameter；
Acquisition module, for carried out with the acquisition parameter, based on ultra wide band detection technique pulse current of PD waveform-when
Between sequence acquisition；
Extraction module, for extracting half peak value time width from the pulse current of PD waveform, and obtain half peak value time width-
Time series；
Spectrogram generates display module, for the half peak value time width-time series to be converted into half peak value time width-phase sequence,
And carry out half-peak value time width-phase sequence spectrogram displaying.
6. the peak value time width of pulse current of PD waveform according to claim 5 half-phase spectrogram constructing apparatus, it is special
Levy and be, also include：
Memory module, for being carried out to the pulse current of PD waveform-time series and half peak value time width-time series
Storage.
7. the peak value time width of pulse current of PD waveform according to claim 5 half-phase spectrogram constructing apparatus, it is special
Levy and be, the extraction module includes：
Zero crossing time computing unit, for the linear equations according to a% at pulse current waveform rising edge and 2 points of b% formation,
Calculate corresponding time t at pulse current waveform apparent zero point0：Wherein, tA%、tB%Respectively
It is a% and b% corresponding times, A at rising edgeA%、AB%The corresponding amplitudes of a% and b% respectively at rising edge, a ＞ b；
Half peak value time width computing unit, for calculating the peak value time width t of pulse current waveform halfw：tw=t50%-t0, wherein, t50%Arteries and veins
Rush 0.5A in current waveformpeakLocate corresponding 2nd time, ApeakIt is pulse current waveform peak value.
8. the peak value time width of pulse current of PD waveform according to claim 7 half-phase spectrogram constructing apparatus, it is special
Levy and be, in the zero crossing time computing unit, a and b difference values are 90 and 10.
9. any described peak value time width of pulse current of PD waveform half-phase spectrogram in a kind of 1-4 based on claim
Building method realizes discharge source mirror method for distinguishing, it is characterised in that including：
Obtain half peak value time width-phase sequence spectrogram；
Go out Partial Discharge Sources, and judge whether interference source according to the half peak value time width-phase sequence mass spectrum database.
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2016
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| JP2002090412A (en) * | 2000-09-12 | 2002-03-27 | Sumitomo Electric Ind Ltd | Partial-discharge measuring apparatus |
| CN103809040A (en) * | 2012-11-06 | 2014-05-21 | 昆山万丰电子有限公司 | Lightning current surge testing stand |
| CN103094016A (en) * | 2013-02-01 | 2013-05-08 | 浙江百事宝电器有限公司 | Hydraulic electromagnetic circuit breaker for preventing thunder |
| CN103197218A (en) * | 2013-04-23 | 2013-07-10 | 国家电网公司 | High-voltage cable insulation defect partial discharge electrification detection diagnostic method |
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