CN108717155A - Configure the method and device of noise threshold and bandwidth - Google Patents
Configure the method and device of noise threshold and bandwidth Download PDFInfo
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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
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Abstract
The invention discloses a kind of method and devices of configuration noise threshold and bandwidth.Wherein, this method includes：Noise by recording monitoring device working environment obtains recording signal, the activity periods intensity and time-frequency characteristics distributed area of noise are determined according to recording signal, and noise threshold Strength Changes feature and time-frequency distributions variation characteristic are established according to the activity periods intensity and time-frequency characteristics distributed area, the configuration parameter that monitoring device is determined according to noise threshold Strength Changes feature and video distribution variation characteristic configures the noise threshold and bandwidth of monitoring device according to configuration parameter.The present invention is solved due to manually setting or being detected noise threshold and bandwidth using noise filtering means, and the technical issues of be difficult to adapt under different noise circumstances and different operating condition the requirement to detecting validity.
Description
Technical field
The present invention relates to electric fields, in particular to a kind of method and device of configuration noise threshold and bandwidth.
Background technology
Shelf depreciation is the form of expression of Electric Power Equipment Insulation performance deterioration, and is the original that insulation performance further deteriorates
Cause.It is timely discovering device insulation defect to be monitored to local discharge signal, prevents the important means of Fault of Insulating Breakdown.Electricity
When shelf depreciation occurs for gas equipment, electromagnetic wave is often first gathered in the grounded metal position adjacent with earth point, is formed electric over the ground
Stream is propagated on equipment surface metal, and by insulating, the shieldings such as position, washer connection, cable insulation terminal are discontinuously located, part
Thus the high-frequency signal of electric discharge can be transferred to device mask shell, and continue to propagate along equipment metal cabinet outer surface, simultaneously
Certain transient voltage pulse signal, i.e. electric wave signal are generated over the ground.
Switchgear partial discharge monitoring technology based on ground electric wave principle has high sensitivity, adaptable, live answers
The features such as flexible with method, becomes a kind of effective means can be used for switch partial discharge live detection and on-line monitoring,
Domestic and international operation power enterprise and controller switching equipment administrative department are more and more applied.With the continuous development of urban distribution network
Expand and to the continuous improvement that power supply reliability requires, the safe and reliable operation of switchgear is increasingly taken seriously.In recent years
A large amount of application is carried out for using ground electric wave Partial Discharge Detection both at home and abroad, has been also accumulated from certain practical experience, has found
A large amount of inside switch cabinet partial discharges faults are simultaneously made that fault pre-alarming in time.
Currently, ground electric wave detection device can be divided into two classes：On-line monitoring system is put in hand-held Partial Discharge Detection equipment drawn game
System, mainly the amplitude of electric wave signal, pulse number and variation tendency measure over the ground, to judge that switchgear whether there is office
Portion's electric discharge phenomena.And in actual use, ground electric wave Partial Discharge Detection is easily influenced by on-site electromagnetic interference so that it is detected
Sensitivity decrease or the erroneous judgement for generating shelf depreciation, therefore general use manually is set or is detected using noise filtering means
The setting and adjustment of threshold value and bandwidth.
In the application of current position electric wave partial discharge monitoring, mostly uses distributed sensor unit and set to individually switching
Standby to be monitored, the detection threshold value of sensor is usually by manually observing or experience is filtered to be set, or by signal
It replaces, the setting of threshold value, work period of on-line monitoring and early-warning conditions is generally disposably completed after sensor installation
Opposite solidification, lacks the adaptability of site environment and the reference frame of setting value.With the electric wave partial discharge monitoring that lands
The extensive application of technology, above-mentioned processing method are difficult to adapt under different noise circumstances and different operating conditions to detection validity
It is required that communication signal, environment electromagnetics are horizontal, powerful device start and stop and machine utilization variation etc. caused by noise circumstance dynamic
Situations such as variation can cause the too low or excessively high artificial threshold value of sensor, detection sensitivity decline and the wrong report of signal or lose report,
The application effect of ground electric wave partial discharge monitoring is influenced, and increases cost of labor and the dependence to artificial experience.
For above-mentioned problem, currently no effective solution has been proposed.
Invention content
An embodiment of the present invention provides a kind of method and devices of configuration noise threshold and bandwidth, at least to solve due to people
Work sets or is detected noise threshold and bandwidth using noise filtering means, and is difficult to adapt to different noise circumstances and different fortune
Under row operating mode to detect validity requirement the technical issues of.
One side according to the ... of the embodiment of the present invention provides a kind of method of configuration noise threshold and bandwidth, including：Record
The noise for making the monitoring device working environment, obtains recording signal；Enlivening for the noise is determined according to the recording signal
Periodic intensity and time-frequency characteristics distributed area；Noise threshold is established according to the activity periods intensity and time-frequency characteristics distributed area
Strength Changes feature and time-frequency distributions variation characteristic；According to the noise threshold Strength Changes feature and time-frequency distributions variation characteristic
Determine the configuration parameter of the monitoring device；The noise threshold and bandwidth of the monitoring device are carried out according to the configuration parameter
Configuration.
Further, the noise for recording the monitoring device working environment obtains recording signal, including：Unload the prison
The filter unit of sensor in measurement equipment；According to the load variations of monitored equipment and interference source periodic feature, determine described in
The recording time interval of sensor；Analog response in the sensor is acquired according to predetermined period and the recording time interval
Noise in bandwidth obtains the recording signal.
Further, activity periods intensity and time-frequency characteristics distributed area that the recording signal determines the noise are analyzed
Between, including：The recording signal is analyzed using Time series analysis method and time-frequency combination.
Further, analyzing the recording signal using Time series analysis method and time-frequency combination includes：Using signal
Recording signal described in time-frequency spectral function and corresponding analysis window function.
Further, noise threshold Strength Changes spy is established according to the activity periods intensity and time-frequency characteristics distributed area
Time-frequency distributions of seeking peace variation characteristic, including：Noise intensity change curve is established according to the activity periods intensity；It makes an uproar described in determination
Noise strength maximum in sound intensity change curve in each predetermined period obtains the periodical change of the noise intensity
Change envelope；Time-frequency characteristics change curve is established according to the time-frequency characteristics distributed area；According to the time-frequency characteristics change curve
Frequency reconfiguration is carried out to the recording signal obtained in each predetermined period, obtains reconstruction signal；To in all predetermined periods
Reconstruction signal carry out Time-frequency Analysis, obtain cyclically-varying time-frequency distributions spectrogram.
Further, determine that the monitoring is set according to the noise threshold Strength Changes feature and time-frequency distributions variation characteristic
Standby configuration parameter, including：According to the cyclically-varying envelope and the cyclically-varying time-frequency distributions spectrogram, determine described in
The configuration parameter of monitoring device.
Further, the noise threshold and bandwidth of the monitoring device are configured according to the configuration parameter, including：
Do not have filtering condition in the sensor of the monitoring device, and the noise all-wave band amplitude of the sensor is in the presence of periodically strong
In the case of spending noise circumstance, the noise threshold is determined according to the noise intensity change curve；Do not have in the sensor
Standby filtering condition, and the noise all-wave band amplitude of the sensor is there is no in the case of periodic intensity noise circumstance, according to
The noise intensity probability distribution upper limit in the cyclically-varying envelope determines the noise threshold；Has filter in the sensor
Wave condition, and in the case that the noise all-wave band amplitude of the sensor is there are periodic intensity noise circumstance, made an uproar according to described
Number or hardware filtering bandwidth are chosen in the frequency distribution of sound intensity；Have filtering condition, and the sensor in the sensor
Noise all-wave band amplitude there is no in the case of periodic intensity noise circumstance, composed according to the cyclically-varying time-frequency distributions
Noise frequency probability distribution upper and lower limit in figure determines the noise threshold.
Further, the noise threshold and bandwidth of the monitoring device are carried out configuring it according to the configuration parameter
Afterwards, the method further includes：It changes in the working environment of the monitoring device or the position of the monitoring device becomes
In the case of change, the noise threshold and bandwidth of the monitoring device sensor are verified again.
Another aspect according to the ... of the embodiment of the present invention additionally provides a kind of device of configuration noise threshold and bandwidth, application
In ground electric wave partial discharge monitoring equipment, described device includes：Recording elements, for recording the monitoring device working environment
Noise obtains recording signal；First determination unit, the activity periods intensity for determining the noise according to the recording signal
With time-frequency characteristics distributed area；Processing unit, for being made an uproar according to the activity periods intensity and the foundation of time-frequency characteristics distributed area
Sound threshold intensity variation characteristic and time-frequency distributions variation characteristic；Second determination unit, for being become according to the noise threshold intensity
Change feature and time-frequency distributions variation characteristic determines the configuration parameter of the monitoring device；Dispensing unit, for according to the configuration
Parameter configures the noise threshold and bandwidth of the monitoring device.
Another aspect according to the ... of the embodiment of the present invention, described device further include：Monitoring unit, in the monitoring device
Working environment change or in the case that the position of the monitoring device changes, to the monitoring device sensor
Noise threshold and bandwidth verify again.
In embodiments of the present invention, recording signal is obtained by recording the noise of monitoring device working environment, according to recording
Signal determines the activity periods intensity and time-frequency characteristics distributed area of noise, and according to the activity periods intensity and time-frequency characteristics
Distributed area establishes noise threshold Strength Changes feature and time-frequency distributions variation characteristic, according to noise threshold Strength Changes feature and
Video distribution variation characteristic determines the configuration parameter of monitoring device, according to configuration parameter to the noise threshold and bandwidth of monitoring device
It is configured, is solved due to manually setting or being detected noise threshold and bandwidth using noise filtering means, and be difficult to fit
The technical issues of answering under different noise circumstances and different operating condition the requirement to detecting validity.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the flow signal of a kind of method of optional configuration noise threshold and bandwidth according to the ... of the embodiment of the present invention
Figure；
Fig. 2 is a kind of schematic diagram of optional noise for recording monitoring device working environment according to the ... of the embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of optional noise periods Strength Changes envelope according to the ... of the embodiment of the present invention；
Fig. 4 is the signal of a kind of optional filtered noise intensity according to the ... of the embodiment of the present invention and video distribution spectrogram
Figure；
Fig. 5 is a kind of structural schematic diagram of the device of configuration noise threshold and bandwidth according to the ... of the embodiment of the present invention.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
It includes to be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment to cover non-exclusive
Those of clearly list step or unit, but may include not listing clearly or for these processes, method, product
Or the other steps or unit that equipment is intrinsic.
Before introducing the technical solution of the embodiment of the present invention, the application scenarios first to technical solution of the embodiment of the present invention
It illustrates, an embodiment of the present invention provides a kind of methods of configuration noise threshold and bandwidth, are locally put using about ground electric wave
Pyroelectric monitor equipment, in actual application scenarios, the monitoring that monitoring device generally carries radio wave sensor in a distributed manner is set
It is standby, monitoring device is usually positioned over to the forward and backward side of switchgear, the intermediate breaker for monitoring switch cabinet and lower section
Bus cable etc., and in the case where space allows, the side of switchgear can also be positioned over.
According to embodiments of the present invention, a kind of method of configuration noise threshold and bandwidth is provided, using about ground electric wave office
Portion's electric discharge monitoring device, as shown in Figure 1, this method includes：
S101 records the noise of monitoring device working environment, obtains recording signal；
S102 determines the activity periods intensity and time-frequency characteristics distributed area of noise according to recording signal；
S103 establishes noise threshold Strength Changes feature and time-frequency according to activity periods intensity and time-frequency characteristics distributed area
Changes in distribution feature；
S104 determines that the configuration of monitoring device is joined according to noise threshold Strength Changes feature and time-frequency distributions variation characteristic
Number；
S105 configures the noise threshold and bandwidth of monitoring device according to configuration parameter.
In embodiments of the present invention, by recording the noise of monitoring device working environment, recording signal is obtained, according to recording
Signal determines the activity periods intensity and time-frequency characteristics distributed area of noise, according to activity periods intensity and time-frequency characteristics distributed area
Between establish noise threshold Strength Changes feature and time-frequency distributions variation characteristic, according to noise threshold Strength Changes feature and when frequency division
Cloth variation characteristic determines the configuration parameter of monitoring device, is matched to the noise threshold and bandwidth of monitoring device according to configuration parameter
It sets, solves due to manually setting or being detected noise threshold and bandwidth using noise filtering means, and be difficult to adapt to difference
Under noise circumstance and different operating condition the technical issues of requirement to detecting validity.
As a kind of optionally embodiment, the noise of the monitoring device working environment is recorded, recording signal is obtained, wrapped
It includes but is not limited to：Unload the filter unit of sensor in the monitoring device；According to the load variations of monitored equipment and interference
Source periodic feature determines the recording time interval of the sensor；The sensor is acquired according to the recording time interval
Noise in middle analog response bandwidth obtains the recording signal.
In actual application scenarios, monitored equipment (i.e. switchgear) load of itself can be with the demand of residential electricity consumption
And other commercial power demand and change, such as the workload demand of the switchgear of three periods is different in the morning, afternoon and evening
, and be also different based on the interference suffered by time in season quasi-periodic switchgear, it is therefore desirable to according to the negative of switchgear
Lotus changes and the interference source periodic feature of switchgear working environment, to determine collecting device (i.e. the sensor of monitoring device)
Recording time interval.For the characteristic of completely recorded noise, it is therefore desirable to after monitoring device is positioned over designated position, unloading prison
The filter unit of each sensor of measurement equipment acquires its analog response band according to predetermined period and above-mentioned recording time interval
Ambient noise signal in width, it is recording signal then to record ambient noise signal, and wherein predetermined period can be according to actual
Use experience is configured, such as day, week, the moon, year etc..
It should be noted that the continuous duration for recording recording signal of sensor needs to be acquired according to the data of monitoring device
The storage depth of unit determines, referring specifically to Figure of description Fig. 2, the continuous recording in Fig. 2 is continuous to record recording letter
Number, after every continuous recording T1 durations, carry out the transmission of recording signal.And as another optionally embodiment, sensor
The load variations only in accordance with above-mentioned monitored equipment and interference source periodic feature do not determine at recording time interval, while also needing
The data transmission bauds for considering data acquisition unit in monitoring device is codetermined by this three.
As a kind of optionally embodiment, analysis recording signal determines the activity periods intensity and time-frequency characteristics point of noise
Cloth section, including but not limited to：Recording signal is analyzed using Time series analysis method and time-frequency combination.
As a kind of optionally embodiment, the recording signal is analyzed using Time series analysis method and time-frequency combination
Including but not limited to：Using recording signal described in signal time-frequency spectral function and corresponding analysis window function.
In specific application scenarios, such as Short Time Fourier Transform is selected to carry out the recording signal to being recorded by discontinuity
Carry out time-domain spectral analysis：
Wherein, in above-mentioned formula, z (t) be one-dimensional discrete signal, η (t) be window function, t be recording recording signal when
Between, t ' is the current time for recording recording signal, and f is frequency；
Alternatively, carrying out time-domain spectral analysis to recording signal by ST distribution functions：
Wherein, in above-mentioned formula, window function isZ (t) is one-dimensional discrete signal, and t is record
The time of recording signal processed, t ' are the current time for recording recording signal, and f is frequency.
Preferably, in above-mentioned formula (1)-(2), window size can be changed by the adjustment of time t and frequency f.Example
Such as, in the low frequency part of signal, when window it is wider, so as to get frequency resolution it is higher；And in the high frequency section of signal, when window compared with
It is narrow, so as to get temporal resolution it is higher.
By carrying out time-frequency domain spectrum analysis to the above-mentioned recording time domain plethysmographic signal obtained by discontinuity recording, recorded
Time-frequency distributions variation characteristic and noise threshold Strength Changes feature (noise intensity and the feature i.e. in different time sections of wave signal
Parameter).
As a kind of optionally embodiment, noise threshold is established according to activity periods intensity and time-frequency characteristics distributed area
Strength Changes feature and time-frequency distributions variation characteristic, including but not limited to：
(1) noise intensity change curve is established according to activity periods intensity；It determines each pre- in noise intensity change curve
If the noise strength maximum in the period, the cyclically-varying envelope of noise intensity is obtained；In specific application scenarios, according to
Noise enlivens intensity and establishes the curve that noise intensity changes over time, by (such as second divides, hour) noise intensity in unit time
It is recorded in the corresponding maximum value of unit observation cycle (such as day, week, the moon), referring to formula (3), is obtained such as Figure of description
Cyclically-varying envelope in attached drawing 3.
S (t)=max (Scyc(1),Scyc(2),…,Scyc(n)) (3)
(2) time-frequency characteristics change curve is established according to time-frequency characteristics distributed area；According to time-frequency characteristics change curve to every
The recording signal obtained in a predetermined period carries out frequency reconfiguration, obtains reconstruction signal；To the reconstruct letter in all predetermined periods
Number carry out Time-frequency Analysis, obtain cyclically-varying time-frequency distributions spectrogram.In specific application scenarios, time-frequency characteristics are established
The time-frequency characteristics change curve that parameter changes over time, being obtained at the time of unit observation cycle (such as day, week, moon etc.) is corresponding
Recording signal carries out frequency reconfiguration and obtains reconstruction signal, then carries out time-frequency characteristics point to reconstruction signal in recording signal total duration
Analysis, obtains its periodically variable time frequency distribution map.In selection observation cycle in corresponding moment filter filtering centre frequency
After lower bandwidth, filtered noise intensity can be obtained, obtain as in Figure of description Fig. 4 video distribution spectrogram and filtering after
Noise intensity.
As a kind of optionally technical solution, the noise threshold and bandwidth of monitoring device are matched according to configuration parameter
It sets, including but not limited to：
(1) do not have filtering condition in the sensor of monitoring device, and there are the periods for the noise all-wave band amplitude of sensor
In the case of property intensity noise environment, noise threshold is determined according to noise intensity change curve；
(2) do not have filtering condition in sensor, and there is no periodic intensities to make an uproar for the noise all-wave band amplitude of sensor
In the case of acoustic environment, noise threshold is determined according to the noise intensity probability distribution upper limit in cyclically-varying envelope；
(3) has filtering condition in sensor, and there are periodic intensity noise rings for the noise all-wave band amplitude of sensor
In the case of border, number or hardware filtering bandwidth are chosen according to the frequency distribution of noise intensity；
(4) has filtering condition in sensor, and periodic intensity noise is not present in the noise all-wave band amplitude of sensor
In the case of environment, noise threshold is determined according to the noise frequency probability distribution upper and lower limit in cyclically-varying time-frequency distributions spectrogram
Value.
As a kind of optionally technical solution, in the noise threshold and band according to the configuration parameter to the monitoring device
After width is configured, the method further includes but is not limited to：It changes or described in the working environment of the monitoring device
In the case that the position of monitoring device changes, the noise threshold and bandwidth of the monitoring device sensor are verified again,
It is configured according to above-mentioned steps 101-105.
It should be noted that for each method embodiment above-mentioned, for simple description, therefore it is all expressed as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the described action sequence because
According to the present invention, certain steps can be performed in other orders or simultaneously.Secondly, those skilled in the art should also know
It knows, embodiment described in this description belongs to preferred embodiment, and involved action and module are not necessarily of the invention
It is necessary.
Through the above description of the embodiments, those skilled in the art can be understood that according to above-mentioned implementation
The method of example can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but it is very much
In the case of the former be more preferably embodiment.Based on this understanding, technical scheme of the present invention is substantially in other words to existing
The part that technology contributes can be expressed in the form of software products, which is stored in a storage
In medium (such as ROM/RAM, magnetic disc, CD), including some instructions are used so that a station terminal equipment (can be mobile phone, calculate
Machine, server or network equipment etc.) execute method described in each embodiment of the present invention.
According to embodiments of the present invention, a kind of configuration for implementing above-mentioned configuration noise threshold and bandwidth method is additionally provided
The device of noise threshold and bandwidth, as shown in figure 5, the device includes：
1) recording elements 501, the noise for recording monitoring device working environment obtain recording signal；
2) the first determination unit 502, activity periods intensity and time-frequency characteristics point for determining noise according to recording signal
Cloth section；
3) processing unit 503, for establishing noise threshold intensity according to activity periods intensity and time-frequency characteristics distributed area
Variation characteristic and time-frequency distributions variation characteristic；
4) the second determination unit 504, for being determined according to noise threshold Strength Changes feature and time-frequency distributions variation characteristic
The configuration parameter of monitoring device；
5) dispensing unit 505, for being configured to the noise threshold and bandwidth of monitoring device according to configuration parameter.
As one kind, optionally technical solution, device further include：Monitoring unit is sent out for the working environment in monitoring device
In the case that the position of changing or monitoring device changes, noise threshold and bandwidth to monitoring device sensor school again
It tests.
By the technical solution of the application embodiment of the present invention, the noise by recording monitoring device working environment obtains recording
Signal determines the activity periods intensity and time-frequency characteristics distributed area of noise according to recording signal, and according to the activity periods
Intensity and time-frequency characteristics distributed area establish noise threshold Strength Changes feature and time-frequency distributions variation characteristic, according to noise threshold
Strength Changes feature and video distribution variation characteristic determine the configuration parameter of monitoring device, according to configuration parameter to monitoring device
Noise threshold and bandwidth are configured, solve due to manually set or using noise filtering means be detected noise threshold and
Bandwidth, and the technical issues of be difficult to adapt under different noise circumstances and different operating condition the requirement to detecting validity.
If the integrated unit in above-described embodiment is realized in the form of SFU software functional unit and as independent product
Sale in use, can be stored in the storage medium that above computer can be read.Based on this understanding, skill of the invention
Substantially all or part of the part that contributes to existing technology or the technical solution can be with soft in other words for art scheme
The form of part product embodies, which is stored in a storage medium, including some instructions are used so that one
Platform or multiple stage computers equipment (can be personal computer, server or network equipment etc.) execute each embodiment institute of the present invention
State all or part of step of method.
In the above embodiment of the present invention, all emphasizes particularly on different fields to the description of each embodiment, do not have in some embodiment
The part of detailed description may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed client, it can be by others side
Formula is realized.Wherein, the apparatus embodiments described above are merely exemplary, for example, the unit division, only one
Kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine or
It is desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed it is mutual it
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
It connects, can be electrical or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of method of configuration noise threshold and bandwidth, is applied to ground electric wave partial discharge monitoring equipment, which is characterized in that packet
It includes：
The noise for recording the monitoring device working environment, obtains recording signal；
The activity periods intensity and time-frequency characteristics distributed area of the noise are determined according to the recording signal；
Noise threshold Strength Changes feature and time-frequency distributions are established according to the activity periods intensity and time-frequency characteristics distributed area
Variation characteristic；
The configuration parameter of the monitoring device is determined according to the noise threshold Strength Changes feature and time-frequency distributions variation characteristic；
The noise threshold and bandwidth of the monitoring device are configured according to the configuration parameter.
2. according to the method described in claim 1, it is characterized in that, record the noise of the monitoring device working environment, obtain
Recording signal, including：
Unload the filter unit of sensor in the monitoring device；
According to the load variations of monitored equipment and interference source periodic feature, the recording time interval of the sensor is determined；
The noise acquired in the sensor in analog response bandwidth according to predetermined period and the recording time interval obtains
The recording signal.
3. according to the method described in claim 1, it is characterized in that, analyzing the active week that the recording signal determines the noise
Phase intensity and time-frequency characteristics distributed area, including：
The recording signal is analyzed using Time series analysis method and time-frequency combination.
4. according to the method described in claim 3, it is characterized in that, analyzing institute using Time series analysis method and time-frequency combination
Stating recording signal includes：Using recording signal described in signal time-frequency spectral function and corresponding analysis window function.
5. according to the method described in claim 2, it is characterized in that, according to the activity periods intensity and time-frequency characteristics distributed area
Between establish noise threshold Strength Changes feature and time-frequency distributions variation characteristic, including：
Noise intensity change curve is established according to the activity periods intensity；Determine each institute in the noise intensity change curve
The noise strength maximum in predetermined period is stated, the cyclically-varying envelope of the noise intensity is obtained；
Time-frequency characteristics change curve is established according to the time-frequency characteristics distributed area；According to the time-frequency characteristics change curve to every
The recording signal obtained in a predetermined period carries out frequency reconfiguration, obtains reconstruction signal；To the weight in all predetermined periods
Structure signal carries out Time-frequency Analysis, obtains cyclically-varying time-frequency distributions spectrogram.
6. according to the method described in claim 5, it is characterized in that, according to the noise threshold Strength Changes feature and when frequency division
Cloth variation characteristic determines the configuration parameter of the monitoring device, including：
According to the cyclically-varying envelope and the cyclically-varying time-frequency distributions spectrogram, the configuration of the monitoring device is determined
Parameter.
7. according to the method described in claim 6, it is characterized in that, according to the configuration parameter to the noise of the monitoring device
Threshold value and bandwidth are configured, including：
Do not have filtering condition in the sensor of the monitoring device, and there are the periods for the noise all-wave band amplitude of the sensor
In the case of property intensity noise environment, the noise threshold is determined according to the noise intensity change curve；
Do not have filtering condition in the sensor, and there is no periodic intensities to make an uproar for the noise all-wave band amplitude of the sensor
In the case of acoustic environment, the noise threshold is determined according to the noise intensity probability distribution upper limit in the cyclically-varying envelope
Value；
Has filtering condition in the sensor, and there are periodic intensity noise rings for the noise all-wave band amplitude of the sensor
In the case of border, number or hardware filtering bandwidth are chosen according to the frequency distribution of the noise intensity；
Has filtering condition in the sensor, and periodic intensity noise is not present in the noise all-wave band amplitude of the sensor
In the case of environment, institute is determined according to the noise frequency probability distribution upper and lower limit in the cyclically-varying time-frequency distributions spectrogram
State noise threshold.
8. method according to any one of claims 1-7, which is characterized in that according to the configuration parameter to described
After the noise threshold and bandwidth of monitoring device are configured, the method further includes：
In the case where the working environment of the monitoring device changes or the position of the monitoring device changes, to institute
The noise threshold and bandwidth for stating monitoring device sensor verify again.
9. a kind of device of configuration noise threshold and bandwidth, is applied to ground electric wave partial discharge monitoring equipment, which is characterized in that institute
Stating device includes：
Recording elements, the noise for recording the monitoring device working environment, obtain recording signal；
First determination unit, the activity periods intensity for determining the noise according to the recording signal and time-frequency characteristics distribution
Section；
Processing unit, it is special for establishing noise threshold Strength Changes according to the activity periods intensity and time-frequency characteristics distributed area
Time-frequency distributions of seeking peace variation characteristic；
Second determination unit, for determining the prison according to the noise threshold Strength Changes feature and time-frequency distributions variation characteristic
The configuration parameter of measurement equipment；
Dispensing unit, for being configured to the noise threshold and bandwidth of the monitoring device according to the configuration parameter.
10. device according to claim 9, which is characterized in that described device further includes：
Monitoring unit, for changing in the working environment of the monitoring device or the position of the monitoring device changes
In the case of, the noise threshold and bandwidth of the monitoring device sensor are verified again.
Priority Applications (1)
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