CN109342814A - For determining the method, apparatus and storage medium of cable partial discharge operating frequency phase frequency - Google Patents
For determining the method, apparatus and storage medium of cable partial discharge operating frequency phase frequency Download PDFInfo
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- CN109342814A CN109342814A CN201811030887.3A CN201811030887A CN109342814A CN 109342814 A CN109342814 A CN 109342814A CN 201811030887 A CN201811030887 A CN 201811030887A CN 109342814 A CN109342814 A CN 109342814A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/12—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into phase shift
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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 for determining the method, apparatus and storage medium of cable partial discharge operating frequency phase frequency.A kind of method for determining cable partial discharge operating frequency phase frequency is provided, this method comprises: obtaining the AC power frequency signal in cable；Determine the position of the first zero crossing in AC power frequency signal；According to the position through the first determining zero crossing, zero offset and noise reduction process were carried out to AC power frequency signal；The position of adjacent wave crest and trough in AC power frequency signal after determining zero offset and noise reduction process；The frequency of AC power frequency signal is determined according to the position through determining adjacent wave crest and trough.The above method can quickly and accurately determine that the frequency of AC power frequency signal, simple and easy and precision are high.Present invention also provides a kind of for determining the device and computer readable storage medium of cable partial discharge operating frequency phase frequency.
Description
Technical field
The present invention relates to cable local discharge field, more particularly relate to determine cable partial discharge operating frequency phase frequency
Method, apparatus and storage medium.
Background technique
Partial Discharge Detection is one of the guarantee that power cable system operates normally.Partial discharge phenomenon in cable can draw
The different degrees of damage of cable is played, the conveying and use of electric power energy is influenced, causes economic loss.The detection of cable partial discharge is to electricity
The investigation of cable failure has important meaning.Since there are important between shelf depreciation and operating frequency phase frequency in cable operational process
Association, investigating its discharge phase distribution characteristics is extremely important and common detection means.The determination of operating frequency phase frequency is
The premise for obtaining discharge phase distribution characteristics, since cable partial discharge mostly uses high frequency sampling, it is desirable that the determination of operating frequency phase frequency
It must be quickly and precisely.
The determination method of operating frequency phase frequency generally has frequency dividing level counting method, cross zero detecting method, Fourier transformation detection
Method, least square fitting method, sinusoid fitting method etc..These method errors are larger or operation is complicated, in practical applications effect
It is bad.
Summary of the invention
The problem that method error is larger or operation is complicated is determined in existing operating frequency phase, it is necessary to provide one kind
With degree of precision and run the not high method, apparatus and storage for being used to determine cable partial discharge operating frequency phase frequency of complexity
Medium.
According to the first aspect of the invention, a kind of method for determining cable partial discharge operating frequency phase frequency is provided, it should
Method includes: the AC power frequency signal obtained in cable；Determine the position of the first zero crossing in AC power frequency signal；According to warp
The position of the first determining zero crossing carried out zero offset and noise reduction process to AC power frequency signal；Determined zero offset and drop
The position of adjacent wave crest and trough in AC power frequency signal of making an uproar that treated；According to through determining adjacent wave crest and trough
Position determines the frequency of AC power frequency signal.
In one of the embodiments, in a nominal period, AC power frequency signal is AC sampling point sequence Y (t),
T=0,1 ..., N-1, N are the number sampled in a nominal period, and N is greater than 1 integer.It determines in AC power frequency signal
The position of first zero crossing, comprising: begin stepping through Y (t) from t=0, as Y (t) * Y (t+1)≤0, determine the first zero crossing
Position t0。
Noise reduction process includes the disposal of gentle filter in one of the embodiments,.
In one of the embodiments, according to the position through the first determining zero crossing, AC power frequency signal was carried out
Zero offset and noise reduction process, comprising: traversal Y (t) is started the cycle over from the first zero crossing, it will be each in AC sampling point sequence Y (t)
A point is assigned a value of the mean value of neighbouring S point, and S is the integer greater than 1, it may be assumed that
Wherein, tt=(t-t0+ N) %N, τ is integer more than or equal to zero, Y'(t) be zero offset and noise reduction process after
AC power frequency signal.
Adjacent wave crest in AC power frequency signal after determining zero offset and noise reduction process in one of the embodiments,
With the position of trough, comprising: approach traversal AC sampling by positive direction and by opposite direction since t=N-1 since t=0
Point sequence Y'(t), to obtain the position of maximum value and minimum value, positive direction is the direction increased along t, and opposite direction is along t
Reduced direction；Judge the maximum value obtained and whether minimum value is continuous maximum value or minimum value, if so, taking continuum
Between position of the midpoint as wave crest or trough the position of the maximum value of acquisition or minimum value is otherwise determined as wave crest or wave
The position of paddy.
AC power frequency signal is determined according to the position through determining adjacent wave crest and trough in one of the embodiments,
Frequency, comprising: the time difference between wave crest and trough is determined according to the position through determining adjacent wave crest and trough, and
The frequency of AC power frequency signal is determined according to the time difference between wave crest and trough.
In one of the embodiments, the method also includes: determine the position for the zero crossing that phase is zero.
The position for the zero crossing that phase is zero is determined in one of the embodiments, comprising: according to the first zero crossing and wave
The positional relationship of peak and trough judges whether the phase of the first zero crossing is zero, if so, it is zero that the first zero crossing, which is phase,
Zero crossing, otherwise, traversal finds the second zero crossing or midpoint of wave crest and trough is true between adjacent wave crest and trough
It is set to the second zero crossing, the second zero crossing is the zero crossing that phase is zero.
According to the second aspect of the invention, provide it is a kind of for determining the device of cable partial discharge operating frequency phase frequency, should
Device includes: signal acquisition module, for obtaining the AC power frequency signal in cable；Zero crossing determining module is handed over for determining
Flow the position of the first zero crossing in power frequency component；Noise reduction module, for according to the position through the first determining zero crossing, to friendship
Stream power frequency component carried out zero offset and noise reduction process；Peak valley determining module, after determining zero offset and noise reduction process
The position of adjacent wave crest and trough in AC power frequency signal；Frequency determining module, for according to through determining adjacent wave crest
The frequency of AC power frequency signal is determined with the position of trough.
According to the third aspect of the invention we, a kind of computer readable storage medium is provided, computer journey is stored thereon with
Sequence, which is characterized in that realized when the program is executed by processor as described for determining cable in above-mentioned any embodiment
The method of partial discharge operating frequency phase frequency.
It is above-mentioned for determining the method, apparatus and computer readable storage medium of cable partial discharge operating frequency phase frequency, to obtaining
It is adjacent in the signal after determining zero offset and noise reduction process after the AC power frequency signal taken carried out zero offset and noise reduction process
Wave crest and trough position, then determine AC power frequency signal further according to the position through determining adjacent wave crest and trough
Frequency, the above method is simple and easy, and computational accuracy is high.
Detailed description of the invention
The preferred rather than embodiment of limitation of the invention will be described with reference to attached drawing by way of example, in which:
Fig. 1 shows the process of the method for determining cable partial discharge operating frequency phase frequency according to one embodiment of the application
Figure.
Fig. 2 shows shown in FIG. 1 for determining the process of the step S400 of the method for cable partial discharge operating frequency phase frequency
Figure.
Fig. 3 shows shown in FIG. 1 for determining the process of the step S500 of the method for cable partial discharge operating frequency phase frequency
Figure.
Fig. 4 shows the stream of the method for determining cable partial discharge operating frequency phase frequency according to another embodiment of the application
Cheng Tu.
Fig. 5 shows shown in Fig. 4 for determining the process of the step S600 of the method for cable partial discharge operating frequency phase frequency
Figure.
Before Fig. 6 shows the method processing for determining cable partial discharge operating frequency phase frequency according to one embodiment of the application
The schematic diagram of signal afterwards.
Fig. 7 shows the signal of the device for determining cable partial discharge operating frequency phase frequency according to one embodiment of the application
Figure.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited to the specific embodiments disclosed below.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Each technical characteristic of above embodiments can carry out arbitrary group
It closes, for simplicity of description, combination not all possible to each technical characteristic in above-described embodiment is all described, however,
As long as there is no contradiction in the combination of these technical features, all should be considered as described in this specification.
Power frequency is that power generation, transmission of electricity, power transformation and the controller switching equipment of electric system and industry are used with civil electrical equipment
Rated frequency, China generally use 50Hz.The rated frequency for the alternating current that high-tension cable generates in its ontology cable core after powering on
It is exactly power frequency, shows as the current signal of a sine wave in the time domain, so-called operating frequency phase is exactly this AC sine wave
The phase of signal.Ideally the frequency-invariant of the power frequency component is 50Hz, but deviation slightly is had when actual motion.Volume
Determining frequency is 50Hz, nominal period 20ms.It needs to obtain by CT induction in cable partial discharge detection and exchanges work in cable body
Frequency signal, as the pulsed synchronous base of partial discharge, referred to as power frequency (phase) signal, it is therefore desirable to accurately determine the signal
Actual frequency.
This application provides a kind of methods for determining cable partial discharge operating frequency phase frequency, as shown in Figure 1, this method packet
It includes:
Step S100 obtains the AC power frequency signal in cable.
Specifically, the AC power frequency signal in cable is obtained by sampling.
Step S200 determines the position of the first zero crossing in AC power frequency signal.
Specifically, the point that the first zero crossing i.e. first AC power frequency signal is zero, determines the position of the point.
Step S300 carried out zero offset and drop to AC power frequency signal according to the position through the first determining zero crossing
It makes an uproar processing.
Specifically, according to the position of the first zero crossing, zero offset and noise reduction process can be carried out to AC power frequency signal,
I.e. by the position translation of the first zero crossing of AC power frequency signal to coordinate origin, and AC power frequency signal is carried out at noise reduction
Reason, to obtain the signal after zero offset and noise reduction process.
Step S400, the position of adjacent wave crest and trough in the AC power frequency signal after determining zero offset and noise reduction process
It sets.
Specifically, it is determined that crossing the position of wave crest and trough adjacent in the AC power frequency signal after zero offset and noise reduction process
It sets, i.e. the position of the adjacent maximum value and minimum value of AC power frequency signal.
Step S500 determines the frequency of AC power frequency signal according to the position through determining adjacent wave crest and trough.
Specifically, the position of wave crest and trough is related to the period of AC power frequency signal, i.e., the frequency with AC power frequency signal
Rate is related, thus the frequency of AC power frequency signal can be determined according to the position through determining adjacent wave crest and trough.
The method for determining cable partial discharge operating frequency phase frequency in above-described embodiment, to the AC power frequency signal of acquisition
After carrying out zero offset and noise reduction process, the position of adjacent wave crest and trough in the signal after determining zero offset and noise reduction process
It sets, the frequency of AC power frequency signal is then determined further according to the position through determining wave crest and trough, the determination method is simply easy
Row, and precision is high.
In one embodiment, in a nominal period, AC power frequency signal is AC sampling point sequence Y (t), t=
0,1 ..., N-1, N are the number sampled in a nominal period, and N is greater than 1 integer.Nominal period is 20ms.Step
S200 determines the position of the first zero crossing in AC power frequency signal, comprising: Y (t) is begun stepping through from t=0, as Y (t) * Y (t+
1) when≤0, the position t of the first zero crossing is determined0。
Specifically, in a nominal period, Y (t) is begun stepping through from t=0, as Y (t) * Y (t+1)≤0, that is, can determine
First zero crossing t0Between t and t+1, i.e. t≤t0≤t+1.In one embodiment, N=2000, i.e., in a nominal period
Interior sampling 2000 times.When carrying out the sampling of enough times, t can be taken0=t.Since the error of drift will not be very big, such mistake
Zero point is normally close to real zero crossing, when subsequent traversal finds peak/valley with this as the starting point, can solve 0 °/360 ° it is discontinuous
The problem of cutting top cuts top i.e. signal spill-out because only there are two zero crossing (0 ° and 180 °) in one cycle for AC signal
The place of journey is only possible to be peaks or valleys, and peak valley place is just avoided using zero crossing as starting point, so that it may guarantee that the place for cutting top connects
It is continuous.
In one embodiment, noise reduction process includes the disposal of gentle filter.
Specifically, noise reduction process is carried out to AC power frequency signal to obtain the signal after noise reduction, the disposal of gentle filter is drop
It makes an uproar one kind of processing, the noise in signal can be effective filtered out.
In one embodiment, step S300, according to the position through the first determining zero crossing, to AC power frequency signal into
Went zero offset and noise reduction process, comprising: from the first zero crossing t0Traversal Y (t) is started the cycle over, by AC sampling point sequence Y (t)
In each point be assigned a value of the mean value of neighbouring S point, S is the integer greater than 1, it may be assumed that
Wherein, tt=(t-t0+ N) %N, τ is the integer more than or equal to zero, Y'(t) it was zero offset and noise reduction process
AC power frequency signal afterwards.
Specifically, from the first zero crossing t0Traversal Y (t) is started the cycle over, by each point in AC sampling point sequence Y (t)
It is assigned a value of the mean value of neighbouring S point, S is the integer greater than 1, i.e.,Wherein tt=(t-t0+ N) %
N, the operation that remainder is added is to be connected 0 °/360 ° of smoothing interval.τ is the integer more than or equal to zero, tt≤τ≤tt+S.
In one embodiment, desirable 5 S.
In one embodiment, as shown in Fig. 2, step S400, the AC power frequency after determining zero offset and noise reduction process
The position of adjacent wave crest and trough in signal, comprising:
Step S410 approaches traversal AC sampling point sequence Y'(t by positive and negative both direction since end to end), to obtain most
The position of big value and minimum value.
Step S420, judges the maximum value obtained and whether minimum value is continuous maximum value or minimum value, if so, holding
Row step S430, it is no to then follow the steps S440.
Step S430 takes the midpoint of continuum as the position of wave crest or trough.
The position of the maximum value of acquisition or minimum value is determined as the position of wave crest or trough by step S440.
Specifically, traversal AC sampling point sequence is approached by positive direction since t=0 and by opposite direction since t=N-1
Arrange Y'(t), to obtain the position of maximum value and minimum value, i.e., by both forward and reverse directions time since end to end in a nominal period
It goes through, to obtain the position of maximum value and minimum value.The positive direction is the direction increased along t, and the opposite direction is to subtract along t
Small direction.When signal, which exists, cuts top, it may appear that continuous maximum value and minimum value, it is therefore desirable to judge the maximum value obtained
It whether is continuous maximum value or minimum value with minimum value, if so, taking the midpoint of continuum as the position of wave crest or trough
It sets, otherwise the position of the maximum value of acquisition or minimum value is determined as to the position of wave crest or trough.Due to being in one cycle
The position of wave crest and trough is found, so the position of the wave crest and trough that obtain is the position of adjacent wave crest and trough.Pass through
It determines and cuts top midpoint and the position pushed up midpoint and be determined as wave crest or trough will be cut, computational accuracy can be improved.
In one embodiment, as shown in figure 3, step S500, according to the position through determining adjacent wave crest and trough
Determine the frequency of AC power frequency signal, comprising:
Step S510 determines the time between wave crest and trough according to the position through determining adjacent wave crest and trough
Difference.
Step S520 determines the frequency of AC power frequency signal according to the time difference between wave crest and trough.
Specifically, the time difference between adjacent wave crest and trough is half period, thus according to wave crest and trough it
Between time difference be that can determine the frequency of AC power frequency signal.Position through determining wave crest and trough is denoted as t respectivelypAnd tg.?
In one embodiment, entire sampling period (i.e. nominal period) is 20ms, altogether 2000 points, then the time of each point are as follows:
DT=20ms/2000=0.01ms,
Time difference between wave crest and trough is
Δ t=| tp-tg| dT=0.01 | tp-tg| ms,
Due to the symmetry of power frequency sinusoidal signal, it is believed that the time difference between peak valley is exactly half of power frequency period, old friend
Flow the frequency of power frequency component are as follows:
In one embodiment, as shown in figure 4, the method for being used to determine cable partial discharge operating frequency phase frequency further include:
Step S600 determines the position for the zero crossing that phase is zero.
Specifically, traversal finds zero crossing and determines that zero crossing is 0 ° according to the front-rear position relationship of peak valley between peak valley
Phase or 180 ° of phases.Partial discharge is the high frequency partial electric discharge that defect generates under the action of high voltage in insulator, operating frequency phase
The changing rule of corresponding high pressure, partial discharge can be broken out within the scope of specific operating frequency phase.And zero phase is for determining partial discharge arteries and veins
Rush the benchmark of phase, zero phase is the phase time that industrial frequency AC sinusoidal signal angle is 0, needs to determine partial discharge pulse with this
The phase offset size at place moment.Therefore, it is necessary to carry out zero phase positioning, that is, determine the zero crossing that phase is zero.
In one embodiment, as shown in figure 5, step S600, determines the position for the zero crossing that phase is zero, comprising:
Step S610 judges the first zero crossing according to the positional relationship of first zero crossing and the wave crest and trough
Whether phase is zero, if so then execute step S610, thens follow the steps S630 if not.
Step S620, the first zero crossing are the zero crossings that phase is zero.
Step S630, traversal finds the second zero crossing or will be in wave crest and trough between adjacent wave crest and trough
Point is determined as the second zero crossing, and the second zero crossing is the zero crossing that phase is zero.
Specifically, the phase of the first zero crossing is judged with the positional relationship of the wave crest and trough according to first zero crossing
Whether position is zero, if occurring trough (i.e. trough is between the first zero crossing and wave crest) after the first zero crossing first, first
Zero crossing is not the zero crossing that phase is zero, if the first zero crossing is crossed and occurs that wave crest first (i.e. wave crest is in the first zero crossing
Between trough), then the first zero crossing is the zero crossing that phase is zero.In one cycle, there are two zero crossings, zero crossings
It is 0 ° of phase or 180 ° of phases.When the first zero crossing is not the zero crossing that phase is zero, traverses and seek between wave crest and trough
It looks for the second zero crossing or the midpoint of wave crest and trough is directly determined as the second zero crossing, and the second zero crossing is phase
The zero crossing for being zero.It is that can determine the phase of zero crossing according to the positional relationship between peak valley, when wave crest is before trough, then
The phase of zero crossing between wave crest and trough is 180 °；When trough is before wave crest, then the zero passage between wave crest and trough
The phase of point is 0 °.
With reference to Fig. 6, the method for determining cable partial discharge operating frequency phase frequency according to one embodiment of the application is shown
The schematic diagram of signal before and after the processing.In Fig. 6, abscissa is sampling number, and ordinate is the amplitude of AC power frequency signal.Its
Middle curve 101 is untreated signal, and curve 102 is the signal after crossing zero offset and noise reduction process.The of curve 102
The position translation of one zero crossing is to origin.From t=0 and t=2000 by positive and negative both direction traversal Y (t), to determine wave crest and wave
The position of paddy then takes the midpoint of continuum for the position of wave crest or trough when encountering continuous maximum value or minimum value.?
In Fig. 6, the position t of minimum valuegThe as position of trough, and the midpoint t of continuous maximum valuepIt is then the position of wave crest.Then root
According to tgAnd tpIt can determine the frequency of AC power frequency signal:
From the point of view of algorithm complexity, peak valley, which detects, need to only be traversed twice (first is that zero crossing is found, second is that smooth and searching wave
Spike paddy), complexity is O (n), practical zero crossing of finding not is complete traversal, and the more computing overheads smoothly of the latter, for
Low order smooth window (S≤33) influence is simultaneously little.Low order smoothly for such power frequency operation, imitate by the difference that disappears in practical applications
Fruit is generally enough, unless in the presence of strongly white noise or harmonic wave interference.Therefore, this application provides a kind of precision is higher
And it runs the not high operating frequency phase of complexity and determines method.
Present invention also provides a kind of for determining the device of cable partial discharge operating frequency phase frequency, as shown in fig. 7, the device
Include:
Signal acquisition module 100, for obtaining the AC power frequency signal in cable.
Zero crossing determining module 200, for determining the position of the first zero crossing in AC power frequency signal.
Noise reduction module 300, for carrying out zero bias to AC power frequency signal according to the position through the first determining zero crossing
Shifting and noise reduction process.
Peak valley determining module 400, for determining wave adjacent in the AC power frequency signal after zero offset and noise reduction process
The position at peak and trough.
Frequency determining module 500, for determining that AC power frequency is believed according to the position through determining adjacent wave crest and trough
Number frequency.
The above-mentioned device for being used to determine cable partial discharge operating frequency phase frequency, carried out zero bias to the AC power frequency signal of acquisition
After shifting and noise reduction process, the position of adjacent wave crest and trough in the signal after determining zero offset and noise reduction process, then again
The frequency of AC power frequency signal is determined according to the position through determining wave crest and trough, the above method is simple and easy, and precision
It is high.
In one of the embodiments, in a nominal period, AC power frequency signal is AC sampling point sequence Y (t),
T=0,1 ..., N-1, N are the number sampled in a nominal period, and N is greater than 1 integer.Zero crossing determining module 200 has
Body is used for: being begun stepping through Y (t) from t=0, as Y (t) * Y (t+1)≤0, is determined the position t of the first zero crossing0。
Noise reduction process includes the disposal of gentle filter in one of the embodiments,.
Noise reduction module 300 is specifically used in one of the embodiments: according to the position through the first determining zero crossing,
Zero offset and noise reduction process were carried out to AC power frequency signal, comprising: start the cycle over traversal Y (t) from the first zero crossing, will exchange
Each point in sampling point sequence Y (t) is assigned a value of the mean value of neighbouring S point, and S is the integer greater than 1, it may be assumed that
Wherein, tt=(t-t0+ N) %N, τ is integer more than or equal to zero, Y'(t) be zero offset and noise reduction process after
AC power frequency signal.
Peak valley determining module 400 is specifically used in one of the embodiments: by positive direction and from t since t=0
=N-1 starts to approach traversal AC sampling point sequence Y'(t by opposite direction), it is square to obtain the position of maximum value and minimum value
To the direction to increase along t, opposite direction is the direction reduced along t；Judge the maximum value obtained and whether minimum value is company
Continuous maximum value or minimum value, if so, taking the midpoint of continuum as the position of wave crest or trough, otherwise, by acquisition
The position of maximum value or minimum value is determined as the position of wave crest or trough.
Frequency determining module 500 is specifically used in one of the embodiments: according to through determining adjacent wave crest and wave
The position of paddy determines the time difference between wave crest and trough, and determines AC power frequency according to the time difference between wave crest and trough
The frequency of signal.
Described device in one of the embodiments, further include: zero phase zero crossing determining module, for determining that phase is
The position of zero zero crossing.
Zero phase zero crossing determining module is specifically used in one of the embodiments: according to the first zero crossing and wave crest
Whether the phase that the first zero crossing is judged with the positional relationship of trough is zero, if so, the first zero crossing is the mistake that phase is zero
Zero point, otherwise, traversal finds the second zero crossing or determines the midpoint of wave crest and trough between adjacent wave crest and trough
For the second zero crossing, the second zero crossing is the zero crossing that phase is zero.
Present invention also provides a kind of computer readable storage mediums, are stored thereon with computer program, computer program
The AC power frequency signal obtained in cable is performed the steps of when being executed by processor；Determine first in AC power frequency signal
The position of zero crossing；According to the position through the first determining zero crossing, AC power frequency signal was carried out at zero offset and noise reduction
Reason；The position of adjacent wave crest and trough in AC power frequency signal after determining zero offset and noise reduction process；According to through determination
The position of adjacent wave crest and trough determine the frequency of AC power frequency signal.
In one of the embodiments, in a nominal period, AC power frequency signal is AC sampling point sequence Y (t),
T=0,1 ..., N-1, N are the number sampled in a nominal period, and N is greater than 1 integer.It determines in AC power frequency signal
The position of first zero crossing, comprising: begin stepping through Y (t) from t=0, as Y (t) * Y (t+1)≤0, determine the first zero crossing
Position t0。
Noise reduction process includes the disposal of gentle filter in one of the embodiments,.
In one of the embodiments, according to the position through the first determining zero crossing, AC power frequency signal was carried out
Zero offset and noise reduction process, comprising: traversal Y (t) is started the cycle over from the first zero crossing, it will be each in AC sampling point sequence Y (t)
A point is assigned a value of the mean value of neighbouring S point, and S is the integer greater than 1, it may be assumed that
Wherein, tt=(t-t0+ N) %N, τ is integer more than or equal to zero, Y'(t) be zero offset and noise reduction process after
AC power frequency signal.
Adjacent wave crest in AC power frequency signal after determining zero offset and noise reduction process in one of the embodiments,
With the position of trough, comprising: approach traversal AC sampling by positive direction and by opposite direction since t=N-1 since t=0
Point sequence Y'(t), to obtain the position of maximum value and minimum value, positive direction is the direction increased along t, and opposite direction is along t
Reduced direction；Judge the maximum value obtained and whether minimum value is continuous maximum value or minimum value, if so, taking continuum
Between position of the midpoint as wave crest or trough the position of the maximum value of acquisition or minimum value is otherwise determined as wave crest or wave
The position of paddy.
AC power frequency signal is determined according to the position through determining adjacent wave crest and trough in one of the embodiments,
Frequency, comprising: the time difference between wave crest and trough is determined according to the position through determining adjacent wave crest and trough, and
The frequency of AC power frequency signal is determined according to the time difference between wave crest and trough.
In one of the embodiments, the method also includes: determine the position for the zero crossing that phase is zero.
The position for the zero crossing that phase is zero is determined in one of the embodiments, comprising: according to the first zero crossing and wave
The positional relationship of peak and trough judges whether the phase of the first zero crossing is zero, if so, it is zero that the first zero crossing, which is phase,
Zero crossing, otherwise, traversal finds the second zero crossing or midpoint of wave crest and trough is true between adjacent wave crest and trough
It is set to the second zero crossing, the second zero crossing is the zero crossing that phase is zero.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computer
In read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein,
To any reference of memory, storage, database or other media used in each embodiment provided herein,
Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of method for determining cable partial discharge operating frequency phase frequency, which is characterized in that the described method includes:
Obtain the AC power frequency signal in the cable；
Determine the position of the first zero crossing in the AC power frequency signal；
According to the position through determining first zero crossing, the AC power frequency signal was carried out at zero offset and noise reduction
Reason；
The position of adjacent wave crest and trough in the AC power frequency signal after determining zero offset and noise reduction process；
The frequency of the AC power frequency signal is determined according to the position through the determining adjacent wave crest and trough.
2. the method according to claim 1, wherein in a nominal period, the AC power frequency signal is
AC sampling point sequence Y (t), t=0,1 ..., N-1, N are the number sampled in a nominal period, and N is greater than 1 integer；
The position of the first zero crossing in the determination AC power frequency signal, comprising:
Y (t) is begun stepping through from t=0, as Y (t) * Y (t+1)≤0, determines the position t of the first zero crossing0。
3. according to the method described in claim 2, it is characterized in that, the noise reduction process includes the disposal of gentle filter.
4. according to the method described in claim 3, it is characterized in that, described according to the position through determining first zero crossing
It sets, zero offset and noise reduction process was carried out to the AC power frequency signal, comprising:
Traversal Y (t) is started the cycle over from first zero crossing, each point in AC sampling point sequence Y (t) is assigned a value of neighbouring
The mean value of S point, S are the integer greater than 1, it may be assumed that
Wherein, tt=(t-t0+ N) %N, τ is the integer more than or equal to zero, Y'(t) it was zero offset and exchanging after noise reduction process
Power frequency component.
5. according to the method described in claim 4, it is characterized in that, the friendship determined after zero offset and noise reduction process
Flow the position of wave crest and trough adjacent in power frequency component, comprising:
Traversal AC sampling point sequence Y'(t is approached by positive direction and by opposite direction since t=N-1 since t=0), with
The position of maximum value and minimum value is obtained, the positive direction is the direction increased along t, and the opposite direction is to reduce along t
Direction；
Judge the maximum value obtained and whether minimum value is continuous maximum value or minimum value, if so, taking continuum
Position of the midpoint as wave crest or trough, otherwise, by the position of the maximum value of acquisition or minimum value be determined as wave crest or
The position of trough.
6. the method according to claim 1, wherein described according to through the determining adjacent wave crest and trough
Position determine the frequency of the AC power frequency signal, comprising:
The time difference between the wave crest and trough is determined according to the position through the determining adjacent wave crest and trough, and
The frequency of the AC power frequency signal is determined according to the time difference between the wave crest and trough.
7. method according to claim 1 to 6, which is characterized in that further include: determine the zero passage that phase is zero
The position of point.
8. the method according to the description of claim 7 is characterized in that the position for the zero crossing that the determining phase is zero, comprising:
According to the positional relationship of first zero crossing and the wave crest and trough judge first zero crossing phase whether
It is zero, if so, first zero crossing is the zero crossing that phase is zero, otherwise, between the adjacent wave crest and trough
Traversal finds the second zero crossing or the midpoint of the wave crest and trough is determined as the second zero crossing, and second zero crossing is
The zero crossing that phase is zero.
9. a kind of for determining the device of cable partial discharge operating frequency phase frequency, which is characterized in that described device includes:
Signal acquisition module, for obtaining the AC power frequency signal in the cable；
Zero crossing determining module, for determining the position of the first zero crossing in the AC power frequency signal；
Noise reduction module, for carrying out zero passage to the AC power frequency signal according to the position through determining first zero crossing
Offset and noise reduction process；
Peak valley determining module, for determined wave crest adjacent in the AC power frequency signal after zero offset and noise reduction process and
The position of trough；
Frequency determining module, for determining that the AC power frequency is believed according to the position through the determining adjacent wave crest and trough
Number frequency.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
The step of method according to claim 1 to 8 is realized when execution.
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