CN109886063A - On-load voltage regulating switch vibrating failure diagnosis method based on the processing of Wavelet time-frequency figure - Google Patents
On-load voltage regulating switch vibrating failure diagnosis method based on the processing of Wavelet time-frequency figure Download PDFInfo
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- CN109886063A CN109886063A CN201811397251.2A CN201811397251A CN109886063A CN 109886063 A CN109886063 A CN 109886063A CN 201811397251 A CN201811397251 A CN 201811397251A CN 109886063 A CN109886063 A CN 109886063A
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Abstract
The present invention relates to a kind of on-load voltage regulating switch vibrating failure diagnosis methods based on the processing of Wavelet time-frequency figure.Its main feature is that including the following steps: the vibration signal that (1) is generated using acceleration transducer acquisition on-load voltage regulating switch in running；(2) noise reduction process is carried out using wavelet transformation for collected vibration signal；(3) envelope is shown using Hilbert transform to processed signal and judges signal peak using singular value and signal is segmented；(4) the Wavelet time-frequency figure of each segmentation is calculated using wavelet transformation；(5) it is directed to the Wavelet time-frequency figure of each segmentation of signal, calculates the average energy value of image；(6) judge whether on-load voltage regulating switch produces failure using average energy value.The beneficial effect of the method for the present invention is: can be used for the fault diagnosis of on-load voltage regulating switch, so that comparison obtains the result of more scientific, accurate fault diagnosis.
Description
Technical field
The present invention relates to a kind of on-load voltage regulating switch vibrating failure diagnosis methods based on the processing of Wavelet time-frequency figure.
Background technique
Power transformer is one of equipment particularly significant and expensive in electric system.And as unique in power transformer
Can generate the component of mechanical movement, the operation conditions of on-load voltage regulating switch directly determine the safety in operation of power transformer with
Reliability, to affect the stability and reliability of entire Operation of Electric Systems.In recent years since converter station quantity increases, the change of current
The load fluctuation stood needs on-load voltage regulation switching gear to carry out burning voltage, frequent to act the event so that on-load voltage regulating switch
Hinder number and become more, threatens the safe operation of power grid, it is therefore desirable to develop the correlation technique of on-load voltage regulating switch fault diagnosis.
For in on-load voltage regulating switch online test method, with vibration detection method research the most extensively.It is adjusted due to having to carry
Compress switch the collision that can be generated between contact in the process of running, therefore the vibration signal generated is able to reflect out the shape of equipment
State detects vibration signal by being attached to transformer close to the vibrating sensor of the tank surface of tap switch, analyzed,
Diagnosis.It is initially directed to the fault diagnosis of breaker, the vibration signal generated when cut-offfing using breaker is proposed and carries out event
Barrier diagnosis, and developed the method for carrying out the extraction of signal characteristic quantity in the way of different and being diagnosed.Due to same
It for switchgear, is equally applicable on on-load voltage regulating switch using the method that vibration signal diagnoses, therefore quickly in breaker
The method of upper utilization also starts further to be studied on on-load voltage regulating switch.But compared to breaker, on-load voltage regulation
The mechanical structure of switch is increasingly complex, and corresponding difficulty of studying is also bigger, therefore research forms diagnosis theory with great
Meaning.
Summary of the invention
The object of the present invention is to provide a kind of on-load voltage regulating switch vibrating failure diagnosis sides based on the processing of Wavelet time-frequency figure
Method can be derived that accurate fault diagnosis result.
A kind of on-load voltage regulating switch vibrating failure diagnosis method based on the processing of Wavelet time-frequency figure, its special feature is that,
Include the following steps:
(1) vibration signal generated using acceleration transducer acquisition on-load voltage regulating switch in running；
(2) noise reduction process is carried out using wavelet transformation for collected vibration signal；
(3) envelope is shown using Hilbert transform to processed signal and judges signal peak simultaneously using singular value
Signal is segmented；
(4) the Wavelet time-frequency figure of each segmentation is calculated using wavelet transformation；
(5) it is directed to the Wavelet time-frequency figure of each segmentation of signal, calculates the average energy value of image；
(6) judge whether on-load voltage regulating switch produces failure using average energy value.
Image energy mean value computation formula in step (5) are as follows:Wherein p (i, j)
The element that the i-th row jth arranges in representing matrix, L are quantization gray level, and c (i, j) is normalization probability.
Step (6) is judged specific as follows using average energy value: by the on-load voltage regulating switch under normal operation
The Wavelet time-frequency figure average energy value of each segmentation is set as p1(i, j) will need to judge whether there is the on-load voltage regulation under fault condition
The Wavelet time-frequency figure average energy value for switching each segmentation is set as p2(i, j), according to formulaCalculate x1,2For than
Compared with characteristic p (i, j), if x1,2> 0.3 then judges that on-load voltage regulating switch produces failure；If 0.3 > x1,2> 0.05
(including two end values) then judges that on-load voltage regulating switch may be faulty, needs to further look at；If > 0.05x1,2Then judge
On-load voltage regulating switch is normal.
The beneficial effect of the method for the present invention is: for the vibration signal acquired from on-load voltage regulating switch, becoming with small echo
The processing of swap-in row, obtains the Wavelet time-frequency figure of vibration signal, includes the machine of on-load voltage regulating switch abundant in Wavelet time-frequency figure
Tool state characteristic quantity, can be used for the fault diagnosis of on-load voltage regulating switch.In order to extract the characteristic quantity in Wavelet time-frequency figure, to figure
As having carried out the calculating of average energy value, so that comparison obtains the result of more scientific, accurate fault diagnosis.
Detailed description of the invention
Attached drawing 1 is flow chart of the invention.
Specific embodiment
In order to which the technical problems, technical solutions and beneficial effects solved by the present invention is more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
Embodiment 1:
With reference to Fig. 1, the present invention provides a kind of on-load voltage regulating switch vibrating failure diagnosis in Wavelet time-frequency figure image procossing
Process, comprising the following steps:
1, the vibration signal generated using acceleration transducer acquisition on-load voltage regulating switch in running；Two acceleration pass
Sensor is mounted on the top of switch.
2, noise reduction process is carried out using wavelet transformation for collected vibration signal, in general, for signal f (x) ∈
L2(R) continuous wavelet transform can be with is defined as:
Envelope, the Hilbert transform definition of real signal x (t) are shown using Hilbert transform to processed signal
It is as follows:T is that time x (t) is signal, and analysis signal is as follows:Original signal x
(t) it is signal, the amplitude of g (t) is that the envelope of original signal is as follows:Signal amplitude.And it utilizes
Singular value judges signal peak and is segmented to signal that singular value can be approximated to be: set s=2i, xKMaximum value in the region i
It isMi maximum value, Ws f (x) are wavelet transformation of the f (x) on scale s.The corresponding position of each scale
The modulus maximum value at place can be with formation sequence { Mi, and have an approximation as follows in lower i:
A singular value, A constant, therefore the approximate algorithm of available singular value: α=log2Mi+1-log2MiA singular value, modulus maximum value
It can be with formation sequence { Mi；
3, the Wavelet time-frequency figure of each segmentation is calculated using wavelet transformation；
4, for the Wavelet time-frequency figure of each segmentation of signal, the average energy value of image, image energy mean value computation are calculated
Formula are as follows:
5, judge whether on-load voltage regulating switch produces failure using average energy value, that is, compare under normal circumstances with needs
The image energy mean value of the Wavelet time-frequency figure of each segmentation of the on-load voltage regulating switch of judgement, judgment criteria are as follows: by normal condition
The Wavelet time-frequency figure average energy value of each segmentation of on-load voltage regulating switch be set as p1(i, j) needs to judge whether faulty have
The Wavelet time-frequency figure average energy value that voltage adjustment of on-load switchs each segmentation is set as p2(i, j),If x1,2> 0.3 then has
Voltage adjustment of on-load switch produces failure；0.3 > x1,2> 0.05 (including two end values) on-load voltage regulating switch may be faulty, needs
It further looks at；> 0.05x1,2On-load voltage regulating switch is normal.
Claims (3)
1. a kind of on-load voltage regulating switch vibrating failure diagnosis method based on the processing of Wavelet time-frequency figure, which is characterized in that including such as
Lower step:
(1) vibration signal generated using acceleration transducer acquisition on-load voltage regulating switch in running；
(2) noise reduction process is carried out using wavelet transformation for collected vibration signal；
(3) envelope is shown using Hilbert transform to processed signal and judges signal peak and to letter using singular value
It number is segmented；
(4) the Wavelet time-frequency figure of each segmentation is calculated using wavelet transformation；
(5) it is directed to the Wavelet time-frequency figure of each segmentation of signal, calculates the average energy value of image；
(6) judge whether on-load voltage regulating switch produces failure using average energy value.
2. the on-load voltage regulating switch vibrating failure diagnosis method as described in claim 1 based on the processing of Wavelet time-frequency figure, special
Sign is:
Image energy mean value computation formula in step (5) are as follows:Wherein p (i, j) indicates square
The element of i-th row jth column in battle array, L are quantization gray level, and c (i, j) is normalization probability.
3. the on-load voltage regulating switch vibrating failure diagnosis method as described in claim 1 based on the processing of Wavelet time-frequency figure, special
Sign is:
Step (6) is judged specific as follows using average energy value: the on-load voltage regulating switch under normal operation is each
The Wavelet time-frequency figure average energy value of segmentation is set as p1(i, j) will need to judge whether there is the on-load voltage regulating switch under fault condition
The Wavelet time-frequency figure average energy value of each segmentation is set as p2(i, j), according to formulaCalculate x1,2For what is compared
Characteristic p (i, j), if x1,2> 0.3 then judges that on-load voltage regulating switch produces failure；If 0.3 > x1,2> 0.05 then sentences
Disconnected on-load voltage regulating switch may be faulty, needs to further look at；If > 0.05x1,2Then judge that on-load voltage regulating switch is normal.
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| CN110542557A (en) * | 2019-08-21 | 2019-12-06 | 中国一拖集团有限公司 | method for rapidly analyzing periodic fault characteristics of large data of machine tool driven by image integration |
| CN111405601A (en) * | 2020-03-30 | 2020-07-10 | 桂林电子科技大学 | Sensor fault detection and positioning method based on dual-channel graph filter |
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| CN107273585A (en) * | 2017-05-25 | 2017-10-20 | 国网山东省电力公司青岛供电公司 | A kind of load ratio bridging switch fault detection method and device |
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| CN106530302A (en) * | 2016-12-13 | 2017-03-22 | 国网上海市电力公司 | Wavelet transform based transformer fault diagnosis method |
| CN107015140A (en) * | 2017-03-13 | 2017-08-04 | 南京航空航天大学 | A kind of analysis of vibration signal method for failure that load ratio bridging switch spring kinetic energy is not enough |
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| CN110542557A (en) * | 2019-08-21 | 2019-12-06 | 中国一拖集团有限公司 | method for rapidly analyzing periodic fault characteristics of large data of machine tool driven by image integration |
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| CN111405601A (en) * | 2020-03-30 | 2020-07-10 | 桂林电子科技大学 | Sensor fault detection and positioning method based on dual-channel graph filter |
| CN111405601B (en) * | 2020-03-30 | 2022-04-05 | 桂林电子科技大学 | Sensor fault detection and positioning method based on dual-channel graph filter |
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