CN104406680A - Method for extracting vibration acceleration signal characteristics of measurement points on surfaces of power transformers - Google Patents
Method for extracting vibration acceleration signal characteristics of measurement points on surfaces of power transformers Download PDFInfo
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- CN104406680A CN104406680A CN201410703063.3A CN201410703063A CN104406680A CN 104406680 A CN104406680 A CN 104406680A CN 201410703063 A CN201410703063 A CN 201410703063A CN 104406680 A CN104406680 A CN 104406680A
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Abstract
The invention discloses a method for extracting vibration acceleration signal characteristics of measurement points on the surfaces of power transformers. The method includes acquiring vibration signals of the measurement points on the surfaces of the power transformers by the aid of vibration acceleration sensors; analyzing frequency spectra to obtain vibration acceleration frequency spectra of the measurement points on the surfaces of the transformers; computing and solving frequency-pass vibration values of adjacent frequency bands of characteristic frequency points; computing characteristic vectors of the vibration signals of the surfaces of the power transformers by the aid of the solved frequency-pass vibration values. The method has the advantages that the characteristic vectors of the vibration signals of the measurement points on the surfaces of the power transformers are solved by the aid of the frequency-pass vibration values of the adjacent frequency bands of the various characteristic frequency points according to the vibration acceleration frequency spectra and are used as bases for analyzing and judging running states of the power transformers by the aid of a vibration process, and accordingly technical support can be provided for monitoring the states of the power transformers.
Description
Technical field
The present invention relates to the feature extracting method of power transformer surface measuring point vibration acceleration signal in a kind of operation, belong to transformer technology field.
Background technology
The experience of theoretical research and long-time running practice shows, when power transformer runs, the situation of its surface vibration signals winding inner with it and iron core is closely related, all can cause the change of surface vibration signals when the compression situation of Winding in Power Transformer and iron core changes or winding occurs distortion or displacement.Therefore, the vibration signal of Real-Time Monitoring and analysis power transformer surface measuring point, can Timeliness coverage and the exception and the fault that judge power transformer iron core and winding.
Effective extraction of power transformer surface measuring point vibration signal characteristics is basis and the prerequisite that vibratory drilling method analyzes power transformer iron core and winding duty.Also there is no effective extracting method of power transformer surface vibration signals proper vector at present, cannot fully, effectively reflect the details that power transformer surface vibration changes and degree, analyzing Winding in Power Transformer and duty unshakable in one's determination to vibratory drilling method and bring many practical difficulties, is also realize the difficult problem that the vibration monitoring of power transformer and state analysis face.
Summary of the invention
The object of the invention is to the deficiency for prior art, the extracting method of a kind of power transformer surface measuring point vibration acceleration signal feature is provided, for the vibration monitoring of power transformer and state analysis work provide technical support.
Problem of the present invention solves with following technical proposals:
The extracting method of a kind of power transformer surface measuring point vibration acceleration signal feature, described method utilizes vibration acceleration sensor to gather the vibration signal of power transformer surface measuring point, then the vibration acceleration frequency spectrum of transformer surface measuring point is obtained by spectrum analysis, again by calculating the passband vibration values asked near characteristic frequency point, the passband vibration values of trying to achieve finally is utilized to calculate the proper vector of power transformer surface vibration acceleration signal.
The extracting method of above-mentioned power transformer surface measuring point vibration acceleration signal feature, said method comprising the steps of:
A. vibration acceleration sensor is placed into power transformer surface vibration measuring point to be determined, is designated as Ti, wherein i=1,2,3 ..., K is this power transformer surface vibration measuring point numbering.The number of measuring point can be determined according to the running status of power transformer to be measured, the position of measuring point is selected to vibrate maximum position in power transformer region surface, or select fixed placement at the high-pressure side of power transformer A phase, B phase and C phase and low-pressure side surface distance top 1/4,1/2, the position of 3/4, adds up to 18 measuring points;
B. vibration acceleration sensor gathers the vibration signal of power transformer surface measuring point Ti by the time interval of setting, and the vibration acceleration time-domain signal of acquisition is designated as respectively
(N is sampling number);
C. the vibration acceleration time-domain signal will obtained
carry out Fast Fourier Transform (FFT) respectively, time-domain signal is converted into frequency-region signal, obtain the rumble spectrum of each sampling, signal
rumble spectrum be designated as respectively successively
;
D. set M power transformer surface vibration characteristic frequency point, the frequency values of each characteristic frequency point is designated as successively
, calculate rumble spectrum respectively
at characteristic frequency point
the passband vibration values of neighbouring frequency range
;
E. according to the passband vibration values of rumble spectrum frequency range near each characteristic frequency point
, calculate the proper vector obtaining power transformer surface measuring point Ti vibration signal
, in this proper vector
individual value
computing method be:
；
The characteristic vector pickup method of above-mentioned power transformer surface measuring point Ti vibration signal, described characteristic frequency point
the frequency values that comprises of neighbouring frequency range be:
, its unit is Hz, rumble spectrum
at characteristic frequency point
the passband vibration values of neighbouring frequency range
computing method as follows:
Wherein,
represent rumble spectrum
medium frequency is
vibration amplitude.
The characteristic vector pickup method of above-mentioned power transformer surface measuring point Ti vibration signal, the sampling number of described vibration acceleration sensor is three times, i.e. N=3; The surface vibration characteristic frequency point of described power transformer arranges ten, i.e. M=10, and ten characteristic frequency points are respectively 100Hz, 200Hz, 300Hz, 400Hz, 500Hz, 600Hz, 700Hz, 800Hz, 900Hz and 1000Hz.
The extracting method of above-mentioned power transformer surface measuring point vibration acceleration signal feature, the sample frequency of described vibration acceleration sensor is 10kHz, and each sampling length is 10k, and the time interval between the start time of adjacent double sampling is 10 seconds.
The present invention tries to achieve the proper vector of power transformer surface measuring point vibration signal according to the passband vibration values of rumble spectrum frequency range near each characteristic frequency point, and then makes accurate judgement to the running status of transformer.The method can the surface vibration of Timeliness coverage power transformer abnormal, for the status monitoring of power transformer provides technical support.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the process flow diagram of power transformer of the present invention surface measuring point vibration signal characteristics extracting method.
Symbol used in literary composition:
for vibration acceleration time-domain signal, N is sampling number,
be respectively signal
rumble spectrum,
be respectively the frequency of each characteristic frequency point,
for rumble spectrum
at characteristic frequency point
the passband vibration values of neighbouring frequency range,
for the proper vector of power transformer surface measuring point vibration signal,
for proper vector
in
individual value,
for rumble spectrum
medium frequency is
vibration amplitude.
Embodiment
The power transformer surface measuring point vibration acceleration signal proper vector that this method is extracted, can fully, effectively reflect the details that power transformer surface vibration changes and degree, for the vibration monitoring of power transformer and state analysis work provide the foundation Data support.
The technical solution used in the present invention is: vibration acceleration sensor is placed into power transformer surface measuring point to be determined by user, the vibration acceleration frequency spectrum of surperficial measuring point is obtained by spectrum analysis, calculate the passband vibration values asked near characteristic frequency point, and then try to achieve the proper vector of power transformer surface vibration signals, judge that the running status of power transformer provides technical support for analyzing based on power transformer surface vibration.
The present invention includes following steps:
Step 1, vibration acceleration sensor is placed into power transformer surface vibration measuring point Ti to be determined, is designated as Ti, i=1,2,3 ..., K, i are this power transformer surface vibration measuring point numberings.The number of measuring point can be determined according to the running status of power transformer to be measured, the position of measuring point is selected to vibrate maximum position in power transformer region surface, or select fixed placement at the high-pressure side of power transformer A phase, B phase and C phase and low-pressure side surface distance top 1/4,1/2, the position of 3/4, adds up to 18 measuring points;
Step 2, the sampling rate of vibration acceleration sensor is set as 10kHz, each sampling length is set as 10k, and namely each sampling obtains 10k sampled value, and each sampling time length is 1 second;
Step 3, at power transformer surface vibration measuring point, use vibration acceleration sensor in 30 seconds, complete 3 samplings, the start time of concrete sampling successively: the 0th second, the 10th second and the 20th second, the vibration acceleration time-domain signal of 3 sampling acquisitions was designated as respectively
;
Step 4,3 vibration acceleration time-domain signals to the power transformer surface vibration that step 3 is asked for
, carry out Fast Fourier Transform (FFT) respectively, the time domain vibration acceleration signal (amplitude is to the time) obtained by sensor measurement is converted into frequency-region signal (amplitude upon frequency), asks for the rumble spectrum of each sampling, signal
rumble spectrum be designated as respectively successively
;
Step 5, the rumble spectrum obtained according to step 4
, according to the power transformer surface measuring point vibration performance Frequency point of setting, calculate the passband vibration values asking for frequency range near each characteristic frequency point respectively, concrete grammar is as follows:
1. define 100Hz, 200Hz, 300Hz, 400Hz, 500Hz, 600Hz, 700Hz, 800Hz, 900Hz, 1000Hz characteristic frequency point as power transformer surface measuring point vibration signal, the frequency values of each characteristic frequency point is designated as successively
;
2. for characteristic frequency point
the frequency values that comprises of neighbouring frequency range be:
, its unit is Hz;
3. rumble spectrum
each characteristic frequency point near frequency range passband vibration values computing method as follows:
（1）
Wherein,
it is rumble spectrum
characteristic frequency point
the passband vibration values of neighbouring frequency range,
represent rumble spectrum
medium frequency is
vibration amplitude;
Step 6, according to step 5 calculate obtain characteristic frequency point near passband vibration values
, calculate the proper vector asking for power transformer surface measuring point vibration signal
, its computing method are:
（2）
Wherein
the in the proper vector of power transformer surface measuring point vibration signal
individual value.
The present invention has following characteristics:
(1) according to theoretical analysis and practical experience, the characteristic frequency point of power transformer surface measuring point vibration signal is set.
(2) individual difference of power transformer is considered, near the characteristic frequency point of power transformer surface measuring point vibration signal, the passband vibration values of bandwidth is as the calculating basis of power transformer surface measuring point vibration performance vector, makes the present invention have good applicability.
(3) calculate its proper vector according to the continuous 3 times power transformer vibration surface measuring point signals asked for of sampling, effectively prevent the impact of measuring error and random disturbance.
(4) computing velocity is fast, and efficiency is high, is convenient to promote.
Claims (5)
1. the extracting method of a power transformer surface measuring point vibration acceleration signal feature, it is characterized in that, described method utilizes vibration acceleration sensor to gather power transformer surface measuring point vibration signal, then the vibration acceleration frequency spectrum of transformer surface measuring point is obtained by spectrum analysis, again by calculating the passband vibration values asked near characteristic frequency point, the passband vibration values of trying to achieve finally is utilized to calculate the proper vector of power transformer surface vibration signals.
2. the extracting method of power transformer surface according to claim 1 measuring point vibration acceleration signal feature, is characterized in that, said method comprising the steps of:
A. on power transformer surface vibration measuring point to be determined, vibration acceleration sensor is installed;
B. vibration acceleration sensor gathers the vibration signal of power transformer surface measuring point by the time interval of setting, and the vibration acceleration time-domain signal of acquisition is designated as respectively
(N is sampling number);
C. the vibration acceleration time-domain signal will obtained
carry out Fast Fourier Transform (FFT) respectively, time-domain signal is converted into frequency-region signal, obtain the rumble spectrum of each sampling, signal
rumble spectrum be designated as respectively successively
;
D. set M power transformer surface vibration characteristic frequency point, the frequency values of each characteristic frequency point is designated as successively
, calculate rumble spectrum respectively
at characteristic frequency point
the passband vibration values of neighbouring frequency range
;
E. according to the passband vibration values of rumble spectrum frequency range near each characteristic frequency point
, calculate the proper vector of power transformer surface measuring point vibration signal
, in this proper vector
individual value
computing method be:
。
3. the extracting method of power transformer surface according to claim 2 measuring point vibration acceleration signal feature, is characterized in that, described characteristic frequency point
the frequency values that comprises of neighbouring frequency range be:
, its unit is Hz, rumble spectrum
at characteristic frequency point
the passband vibration values of neighbouring frequency range
computing method as follows:
Wherein,
represent rumble spectrum
medium frequency is
vibration amplitude.
4. the extracting method of power transformer surface measuring point vibration acceleration signal feature is characterized in that according to claim 3, and the sampling number of described vibration acceleration sensor is three times, i.e. N=3; The surface vibration characteristic frequency point of described power transformer arranges ten, i.e. M=10, and ten characteristic frequency points are respectively 100Hz, 200Hz, 300Hz, 400Hz, 500Hz, 600Hz, 700Hz, 800Hz, 900Hz and 1000Hz.
5. the extracting method of power transformer surface measuring point vibration acceleration signal feature according to claim 4, it is characterized in that, the sample frequency of described vibration acceleration sensor is 10kHz, and each sampling length is 10k, and the time interval between the start time of adjacent double sampling is 10 seconds.
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Cited By (7)
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| CN104655967A (en) * | 2015-03-17 | 2015-05-27 | 国家电网公司 | Extraction method for vibration signal characteristic quantity of winding of distribution transformer |
| CN107131949A (en) * | 2017-04-14 | 2017-09-05 | 兰州空间技术物理研究所 | A kind of method that utilization star accelerometer measures micro-vibration physical index indirectly |
| CN109341974A (en) * | 2018-10-29 | 2019-02-15 | 黄莹 | Equipment fault detection device and method based on mobile terminal |
| CN110542474A (en) * | 2019-09-04 | 2019-12-06 | 中国科学院上海高等研究院 | Method, system, medium, and apparatus for detecting vibration signal of device |
| CN111308250A (en) * | 2020-03-19 | 2020-06-19 | 深圳供电局有限公司 | Transformer fault diagnosis method and device based on vibration lines |
| CN112098065A (en) * | 2020-09-21 | 2020-12-18 | 成都卓微科技有限公司 | Equipment operation state diagnosis method, storage medium and terminal |
| CN112858718A (en) * | 2021-01-21 | 2021-05-28 | 广东电网有限责任公司 | Oil speed measuring method, device and system for transformer leakage oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107101714A (en) * | 2017-05-09 | 2017-08-29 | 华北电力大学（保定） | A kind of transformer health Evaluation method based on multi-measuring point vibration signal characteristics |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655967A (en) * | 2015-03-17 | 2015-05-27 | 国家电网公司 | Extraction method for vibration signal characteristic quantity of winding of distribution transformer |
| CN104655967B (en) * | 2015-03-17 | 2017-08-01 | 国家电网公司 | Distribution transformer basket vibration signal characteristic quantity extracting method |
| CN107131949A (en) * | 2017-04-14 | 2017-09-05 | 兰州空间技术物理研究所 | A kind of method that utilization star accelerometer measures micro-vibration physical index indirectly |
| CN107131949B (en) * | 2017-04-14 | 2019-08-23 | 兰州空间技术物理研究所 | A method of measuring micro-vibration physical index indirectly using star accelerometer |
| CN109341974A (en) * | 2018-10-29 | 2019-02-15 | 黄莹 | Equipment fault detection device and method based on mobile terminal |
| CN109341974B (en) * | 2018-10-29 | 2020-12-22 | 黄莹 | Equipment fault detection device and method based on mobile terminal |
| CN110542474A (en) * | 2019-09-04 | 2019-12-06 | 中国科学院上海高等研究院 | Method, system, medium, and apparatus for detecting vibration signal of device |
| CN111308250A (en) * | 2020-03-19 | 2020-06-19 | 深圳供电局有限公司 | Transformer fault diagnosis method and device based on vibration lines |
| CN112098065A (en) * | 2020-09-21 | 2020-12-18 | 成都卓微科技有限公司 | Equipment operation state diagnosis method, storage medium and terminal |
| CN112098065B (en) * | 2020-09-21 | 2022-08-23 | 成都卓微科技有限公司 | Method for diagnosing equipment running state, storage medium and terminal |
| CN112858718A (en) * | 2021-01-21 | 2021-05-28 | 广东电网有限责任公司 | Oil speed measuring method, device and system for transformer leakage oil |
| CN112858718B (en) * | 2021-01-21 | 2023-09-05 | 广东电网有限责任公司 | Oil speed measuring method, device and system for oil leakage of transformer |
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