CN112484844A - Method and system for detecting noise and environmental interference resistance of transformer - Google Patents
Method and system for detecting noise and environmental interference resistance of transformer Download PDFInfo
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- CN112484844A CN112484844A CN202011373795.2A CN202011373795A CN112484844A CN 112484844 A CN112484844 A CN 112484844A CN 202011373795 A CN202011373795 A CN 202011373795A CN 112484844 A CN112484844 A CN 112484844A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000007613 environmental effect Effects 0.000 title claims abstract description 18
- 230000005236 sound signal Effects 0.000 claims abstract description 38
- 238000001914 filtration Methods 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000009432 framing Methods 0.000 claims abstract description 13
- 230000003595 spectral effect Effects 0.000 claims abstract description 5
- 238000005070 sampling Methods 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 12
- 230000036039 immunity Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/26—Pre-filtering or post-filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L21/0232—Processing in the frequency domain
Abstract
The invention discloses a method and a system for detecting noise and environmental interference resistance of a transformer, wherein the method comprises the steps of collecting a transformer sound signal for a period of time; performing framing processing on the obtained transformer acoustic signal; calculating the sound pressure level of each frame of transformer sound signals, and finding out the frame with the minimum sound pressure level; filtering the transformer sound signal of the frame with the minimum sound pressure level to obtain a pure transformer sound signal; and calculating the sound pressure level of the pure transformer sound signal, wherein when the obtained transformer sound signal is subjected to framing processing, a data overlapping part exists between adjacent frames, and the filtering method adopted during the filtering processing is one or a combination of low-pass filtering, comb filtering and spectral subtraction. The invention can reduce the interference of the surrounding environment noise in the noise measurement process of the transformer, improves the noise test precision of the transformer, and has the advantages of easy realization and high detection efficiency and precision.
Description
Technical Field
The invention relates to a transformer sound level measurement technology, in particular to a transformer noise anti-environmental interference detection method and system.
Background
The transformer noise measurement is an important work which needs to be carried out in the transformer substation noise treatment, dispute test and transformer operation state evaluation processes. In the actual sound level detection process, the sound signal of the transformer is difficult to avoid the interference of external environment noise, such as automobile whistling, animal whistling and the like. On-site detection workers usually need to wait for a long time until the interference of environmental noise disappears, and then can continue to measure, so that the measurement period is long, and the measurement efficiency is low. For the continuously occurring environmental noise, the detection work cannot even be carried out. At present, the conventional transformer noise measurement method cannot avoid the interference of environmental noise, and a result obtained by direct measurement has a large error with the actual sound level of the transformer.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a method and a system for detecting the noise of the transformer and resisting the environmental interference.
In order to solve the technical problems, the invention adopts the technical scheme that:
a transformer noise anti-environmental interference detection method comprises the implementation steps of:
1) collecting a period of transformer acoustic signals;
2) performing framing processing on the obtained transformer acoustic signal;
3) calculating the sound pressure level of each frame of transformer sound signals, and finding out the frame with the minimum sound pressure level;
4) filtering the transformer sound signal of the frame with the minimum sound pressure level to obtain a pure transformer sound signal;
5) the sound pressure level of the clean transformer sound signal is calculated.
Optionally, when the obtained transformer acoustic signal is subjected to framing processing in step 2), a data overlapping portion exists between adjacent frames.
Optionally, the data overlapping portion includes half of the number of the transformer acoustic signal sampling data points per frame.
Optionally, when the transformer acoustic signal of the frame with the smallest sound pressure level is subjected to filtering processing in step 4), the adopted filtering method is one or a combination of low-pass filtering, comb filtering and spectral subtraction.
Optionally, the filter used for the low-pass filtering is a low-pass filter with a cut-off frequency of 2 kHz.
Optionally, the signal sampling rate is 48kHz and the sampling time duration is 3s when the transformer acoustic signal is collected for a period of time in step 1), and 144000 transformer acoustic signal sampling data points are obtained.
Optionally, when the obtained transformer acoustic signal is subjected to framing processing in step 2), 29 frames of transformer acoustic signals are obtained in a frame dividing manner, the frame length is 0.2s, wherein each frame includes 9600 transformer acoustic signal sampling data points, and the overlapped portion includes 4800 transformer acoustic signal sampling data points.
In addition, the invention also provides a transformer noise anti-environmental interference detection system, which comprises:
the signal acquisition program unit is used for acquiring a transformer sound signal for a period of time;
the signal framing program unit is used for framing the obtained transformer acoustic signal;
the minimum frame searching program unit is used for calculating the sound pressure level of each frame of transformer sound signals and finding out the frame with the minimum sound pressure level;
the filtering processing program unit is used for filtering the transformer sound signal of the frame with the minimum sound pressure level to obtain a pure transformer sound signal;
and the sound pressure level calculation program unit is used for calculating the sound pressure level of the sound signal of the pure transformer.
Furthermore, the present invention also provides a transformer noise anti-environmental interference detection system, which comprises a microprocessor and a memory, which are connected with each other, wherein the microprocessor is programmed or configured to execute the steps of the transformer noise anti-environmental interference detection method, or the memory stores a computer program which is programmed or configured to execute the transformer noise anti-environmental interference detection method.
Furthermore, the present invention also provides a computer readable storage medium having stored therein a computer program programmed or configured to execute the transformer noise anti-environmental interference detection method.
Compared with the prior art, the invention has the following advantages: after the method of the invention obtains the transformer acoustic signal, the pure transformer noise signal is obtained through frame processing, sound pressure level minimum frame searching and filtering processing, the interference of the environmental noise in the transformer noise measurement process can be effectively reduced, and the method has the advantages of easy realization and high detection efficiency and precision.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the method for detecting noise and environmental interference resistance of a transformer in this embodiment include:
1) collecting a period of transformer acoustic signals;
2) performing framing processing on the obtained transformer acoustic signal;
3) calculating the sound pressure level of each frame of transformer sound signals, and finding out the frame with the minimum sound pressure level;
4) filtering the transformer sound signal of the frame with the minimum sound pressure level to obtain a pure transformer sound signal;
5) the sound pressure level of the clean transformer sound signal is calculated.
As an alternative implementation manner, in this embodiment, when the transformer acoustic signal is collected for a period of time in step 1), the signal sampling rate is 48kHz, and the sampling time duration is 3s, so that a total of 144000 sampling data points of the transformer acoustic signal are obtained.
As an optional implementation manner, when the obtained transformer acoustic signal is subjected to framing processing in step 2) of this embodiment, a data overlapping portion exists between adjacent frames.
As an alternative implementation manner, in this embodiment, the number of the transformer acoustic signal sampling data points included in the data overlapping portion is half of the number of the transformer acoustic signal sampling data points included in each frame.
As an optional implementation manner, when performing frame division processing on the obtained transformer acoustic signal in step 2) of this embodiment, the frame division obtains 29 frames of transformer acoustic signals altogether, where the frame length is 0.2s, where each frame includes 9600 transformer acoustic signal sampling data points, and the overlapping portion includes 4800 transformer acoustic signal sampling data points.
In this embodiment, after calculating the sound pressure level of each frame of transformer sound signal in step 3), 29 pieces of sound pressure level data are obtained. And 4) finding out the minimum value of the 29 sound pressure levels by adopting a cyclic comparison method, wherein the corresponding frame is the transformer noise signal which is relatively weak in interference of environmental noise. In this embodiment, the sound pressure level of the 2 nd frame signal is the minimum, i.e. corresponds to 4801-14400 th data points in the transformer sound signal.
The noise of the transformer is a steady-state signal, the frequency is generally concentrated in the range of 2kHz, the frequency components of 50Hz and integral multiple frequency components of the 50Hz are taken as main components, the environmental noise interference has the characteristic of being paroxysmal, and the frequency is rarely overlapped with the integral multiple of the 50 Hz. Therefore, the pure transformer sound signal can be obtained by filtering the sound signal of the frame with the minimum sound pressure level in the step 5).
As an optional implementation manner, when the transformer acoustic signal of the frame with the smallest sound pressure level is subjected to filtering processing in step 4) of this embodiment, the adopted filtering method is one or a combination of low-pass filtering, comb filtering, and spectral subtraction. The low-pass filtering can effectively filter the interference of environmental noise, and the comb filter can be adopted to extract the main noise frequency components of the transformer; the adoption of the spectral subtraction method can suppress non-stationary burst interference signals in the noise signals of the transformer.
As an optional implementation manner, the filter used in the low-pass filtering of this embodiment is a low-pass filter with a cutoff frequency of 2kHz, and can effectively filter the interference of the environmental noise above 2 kHz.
In addition, this embodiment also provides an anti-environmental interference detection system of transformer noise, including:
the signal acquisition program unit is used for acquiring a transformer sound signal for a period of time;
the signal framing program unit is used for framing the obtained transformer acoustic signal;
the minimum frame searching program unit is used for calculating the sound pressure level of each frame of transformer sound signals and finding out the frame with the minimum sound pressure level;
the filtering processing program unit is used for filtering the transformer sound signal of the frame with the minimum sound pressure level to obtain a pure transformer sound signal;
and the sound pressure level calculation program unit is used for calculating the sound pressure level of the sound signal of the pure transformer.
In addition, the present embodiment also provides a transformer noise anti-environmental interference detection system, which includes a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the steps of the transformer noise anti-environmental interference detection method, or the memory stores a computer program programmed or configured to execute the transformer noise anti-environmental interference detection method.
Furthermore, the present invention also provides a computer readable storage medium having stored therein a computer program programmed or configured to perform the transformer noise anti-environmental interference detection method.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is directed to methods, apparatus (systems), and computer program products according to embodiments of the application wherein instructions, which execute via a flowchart and/or a processor of the computer program product, create means for implementing functions specified in the flowchart and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A transformer noise anti-environmental interference detection method is characterized by comprising the following implementation steps:
1) collecting a period of transformer acoustic signals;
2) performing framing processing on the obtained transformer acoustic signal;
3) calculating the sound pressure level of each frame of transformer sound signals, and finding out the frame with the minimum sound pressure level;
4) filtering the transformer sound signal of the frame with the minimum sound pressure level to obtain a pure transformer sound signal;
5) the sound pressure level of the clean transformer sound signal is calculated.
2. The method for detecting noise and environmental interference of transformer according to claim 1, wherein when framing the obtained transformer acoustic signal in step 2), there is data overlap between adjacent frames.
3. The method of claim 2, wherein the data overlap portion comprises half as many transformer acoustic signal sampling data points per frame as the transformer acoustic signal sampling data points per frame.
4. The method for detecting noise and environmental interference of transformer according to claim 1, wherein the filtering method used in step 4) is one or more of low-pass filtering, comb filtering, and spectral subtraction.
5. The method for detecting noise and environmental interference of transformer according to claim 4, wherein the low-pass filter is a low-pass filter with a cut-off frequency of 2 kHz.
6. The method for detecting noise and environmental interference of a transformer according to claim 1, wherein the sampling rate of the transformer acoustic signal is 48kHz and the sampling time is 3s when the transformer acoustic signal is collected for a period of time in step 1), and 144000 sampling data points of the transformer acoustic signal are obtained.
7. The method for detecting noise of transformer and environmental interference according to claim 6, wherein when the obtained transformer acoustic signal is subjected to framing in step 2), 29 frames of transformer acoustic signal are obtained in all frames, the frame length is 0.2s, wherein each frame comprises 9600 transformer acoustic signal sampling data points, and the overlapping portion comprises 4800 transformer acoustic signal sampling data points.
8. A transformer noise anti-environmental interference detection system, comprising:
the signal acquisition program unit is used for acquiring a transformer sound signal for a period of time;
the signal framing program unit is used for framing the obtained transformer acoustic signal;
the minimum frame searching program unit is used for calculating the sound pressure level of each frame of transformer sound signals and finding out the frame with the minimum sound pressure level;
the filtering processing program unit is used for filtering the transformer sound signal of the frame with the minimum sound pressure level to obtain a pure transformer sound signal;
and the sound pressure level calculation program unit is used for calculating the sound pressure level of the sound signal of the pure transformer.
9. A transformer noise anti-environmental interference detection system comprising a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to perform the steps of the transformer noise anti-environmental interference detection method according to any one of claims 1 to 7, or the memory stores a computer program programmed or configured to perform the transformer noise anti-environmental interference detection method according to any one of claims 1 to 7.
10. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, which is programmed or configured to perform the transformer noise immunity detection method according to any one of claims 1 to 7.
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| CN202011373795.2A CN112484844A (en) | 2020-11-30 | 2020-11-30 | Method and system for detecting noise and environmental interference resistance of transformer |
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| CN202011373795.2A CN112484844A (en) | 2020-11-30 | 2020-11-30 | Method and system for detecting noise and environmental interference resistance of transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112018A (en) * | 2021-12-03 | 2022-03-01 | 国网江苏省电力有限公司宿迁供电分公司 | Method for improving sound measurement precision of transformer |
| CN114112018B (en) * | 2021-12-03 | 2024-04-30 | 国网江苏省电力有限公司宿迁供电分公司 | Method for improving sound measurement precision of transformer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537227A (en) * | 2014-12-18 | 2015-04-22 | 中国科学院上海高等研究院 | Transformer substation noise separation method |
| CN105486938A (en) * | 2014-09-19 | 2016-04-13 | 国家电网公司 | Transformer station mixed noise separation method |
| CN105508276A (en) * | 2015-12-08 | 2016-04-20 | 国家电网公司 | Method for evaluating noise of main transformer fan of urban transformer substation |
| US20160349106A1 (en) * | 2014-11-21 | 2016-12-01 | Xi'an Jiaotong University | Frequency-sweep experimental method for predicting noise of power capacitor |
| CN106885971A (en) * | 2017-03-06 | 2017-06-23 | 西安电子科技大学 | A kind of intelligent background noise-reduction method for Cable fault examination fixed point apparatus |
| CN110426569A (en) * | 2019-07-12 | 2019-11-08 | 国网上海市电力公司 | A kind of transformer acoustical signal noise reduction process method |
| CN112002542A (en) * | 2020-09-21 | 2020-11-27 | 国网湖南省电力有限公司 | Method for reducing distribution transformer operation noise by suppressing user load harmonic |
-
2020
- 2020-11-30 CN CN202011373795.2A patent/CN112484844A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486938A (en) * | 2014-09-19 | 2016-04-13 | 国家电网公司 | Transformer station mixed noise separation method |
| US20160349106A1 (en) * | 2014-11-21 | 2016-12-01 | Xi'an Jiaotong University | Frequency-sweep experimental method for predicting noise of power capacitor |
| CN104537227A (en) * | 2014-12-18 | 2015-04-22 | 中国科学院上海高等研究院 | Transformer substation noise separation method |
| CN105508276A (en) * | 2015-12-08 | 2016-04-20 | 国家电网公司 | Method for evaluating noise of main transformer fan of urban transformer substation |
| CN106885971A (en) * | 2017-03-06 | 2017-06-23 | 西安电子科技大学 | A kind of intelligent background noise-reduction method for Cable fault examination fixed point apparatus |
| CN110426569A (en) * | 2019-07-12 | 2019-11-08 | 国网上海市电力公司 | A kind of transformer acoustical signal noise reduction process method |
| CN112002542A (en) * | 2020-09-21 | 2020-11-27 | 国网湖南省电力有限公司 | Method for reducing distribution transformer operation noise by suppressing user load harmonic |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112018A (en) * | 2021-12-03 | 2022-03-01 | 国网江苏省电力有限公司宿迁供电分公司 | Method for improving sound measurement precision of transformer |
| CN114112018B (en) * | 2021-12-03 | 2024-04-30 | 国网江苏省电力有限公司宿迁供电分公司 | Method for improving sound measurement precision of transformer |
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