CN115790830A - Converter transformer voiceprint measuring point optimization method based on oil tank vibration signal - Google Patents
Converter transformer voiceprint measuring point optimization method based on oil tank vibration signal Download PDFInfo
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- CN115790830A CN115790830A CN202211530657.XA CN202211530657A CN115790830A CN 115790830 A CN115790830 A CN 115790830A CN 202211530657 A CN202211530657 A CN 202211530657A CN 115790830 A CN115790830 A CN 115790830A
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Abstract
The invention discloses a mode-based converter transformer voiceprint measuring point optimization method based on an oil tank vibration signal. According to the invention, the image relationship between the signal measured by each voiceprint alternative measuring point and the actual vibration of the converter transformer body is evaluated by comparing the correlation coefficient between the vibration signal of the converter transformer oil tank and the voiceprint alternative measuring point measuring signal, so that the voiceprint measuring point with the highest correlation is preferably selected. The method can avoid the problem of poor measurement effect of randomly selecting the noise of the voiceprint measuring point, and improve the voiceprint monitoring precision of the converter transformer.
Description
Technical Field
The invention relates to a converter transformer voiceprint measuring point optimization method, in particular to a converter transformer voiceprint measuring point optimization method based on an oil tank vibration signal, and belongs to the technical field of transformer substation monitoring.
Background
The converter transformer is one of key devices of an ultra-high voltage direct-current transmission system and plays an important role in alternating-current and direct-current conversion. In order to ensure the safe and reliable operation of the converter transformer, the operation state of the converter transformer needs to be monitored in real time. The converter transformer state monitoring based on voiceprint monitoring can reflect the running state of equipment in real time by analyzing the voiceprint characteristics of the converter transformer, and meanwhile, the converter transformer state monitoring has the advantages of non-contact and no influence on the running of the converter transformer, so that the converter transformer state monitoring based on voiceprint monitoring has wide application prospects. However, the measuring point arrangement of the existing voiceprint monitoring is not reasonably planned, so that more interference signals exist. The optimization of the voiceprint measuring point is beneficial to reasonably setting the voiceprint measuring point, and the measuring precision is improved.
Disclosure of Invention
The invention aims to provide a converter transformer voiceprint measuring point optimization method based on an oil tank vibration signal.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a converter transformer voiceprint measuring point optimization method based on an oil tank vibration signal comprises the following steps:
step 1: building a test platform: the test platform comprises more than 1 signal acquisition device, an electronic computer 4, a data acquisition card 3, a multi-channel recorder 5 and more than 1 directional microphone 6; the signal acquisition device consists of a vibration sensor 1 and a signal amplifier 2 which are cascaded; the output end of the data acquisition card 3 is connected with the input port of the electronic computer 4 through a network cable, the electronic computer 4 is provided with signal processing software, the directional microphone 5 is connected with the corresponding input port of the multi-channel recorder 6, and the multi-channel recorder 6 and each signal amplifier 2 are connected with the electronic computer 4 through the data acquisition card 3; the voiceprint signals collected by the multi-channel recorder 6 are output to the electronic computer 4; the vibration sensors 1 are randomly distributed on the side surfaces of the oil tank, and more than 1 vibration sensor 1 is distributed on each side surface.
Step 2: primary measurement of vibration signals: each vibration sensor 1 collects a vibration signal;
and step 3: selecting a measurement frequency band: analyzing the frequency band distribution of the vibration signals acquired by each vibration sensor 1 in the step 1, and determining that a continuous frequency band is used as a comparison frequency band, wherein the energy of the vibration signals in the comparison frequency band is not less than the preset proportion of the total energy of the corresponding vibration signals;
and 4, step 4: screening vibration measuring points: screening vibration measuring points according to the maximum frequency value of the comparison frequency band, wherein the distance between the vibration measuring points is preferably not more than the preset ratio of the wavelength corresponding to the maximum frequency value;
and 5: testing the voiceprint signal: at least a preset number of voiceprint alternative measuring points are uniformly distributed around 4 weeks of the converter transformer; synchronously measuring a voiceprint signal of a preset voiceprint measuring point and a vibration signal of a vibration measuring point one by one, wherein the measuring time is not less than preset duration;
and 6: and (3) calculating a correlation coefficient: calculating correlation coefficients of the voiceprint signals of the preset voiceprint measuring points and the vibration signals of the vibration measuring points, and calculating the average value of the correlation coefficients of the preset voiceprint measuring points;
and 7: the acoustic print measuring point is preferably: and respectively selecting a preset voiceprint measuring point with the largest correlation coefficient average value from 4 side surfaces of the transformer as a voiceprint preferred measuring point.
Further, vibration signals of 20 measuring points on the side surface of the oil tank in the step 1 are randomly generated, the number of the measuring points on each side surface is not less than 5, and the signal amplifier 2 can be powered by a battery or an external power supply;
the frequency range which can be measured by the vibration sensor 1 is 1-10000 Hz;
the data acquisition card 3 is provided with not less than 32 signal interfaces;
the multichannel recorder 5 is provided with not less than 4 microphone interfaces;
the multichannel recorder 5 is capable of measuring frequencies in the range of 1 to 96000Hz.
Further, the initial frequency of the comparison frequency band in the step 3 is 1Hz, and the energy of the vibration signal in the comparison frequency band is not less than 95% of the total energy of the original signal.
Further, in the step 4, the distance between the vibration measuring points is not more than one half of the wavelength corresponding to the maximum frequency value.
Further, in the step 5, not less than 50 voiceprint candidate measuring points are uniformly arranged on 4 side surfaces of the converter transformer.
Further, in the step 5, a support for placing the directional microphone 5 may be arranged as a voiceprint candidate measuring point, or the directional microphone 5 may be moved to a preset voiceprint candidate measuring point position, and a voiceprint of the voiceprint measuring point and a vibration signal of the vibration measuring point are synchronously measured, where the measuring time is not less than 5 seconds.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
according to the invention, the image relationship between the signal measured by each voiceprint alternative measuring point and the actual vibration of the converter transformer body can be evaluated by comparing the correlation coefficient between the vibration signal of the converter transformer oil tank and the voiceprint alternative measuring point measurement signal, so that the voiceprint measuring point with the highest correlation is selected. The method has the characteristic of improving the voiceprint monitoring precision of the converter transformer.
Drawings
FIG. 1 is a connection diagram of the apparatus of the present invention;
fig. 2 is an implementation flow chart.
In the drawings: 1. a vibration sensor; 2. a signal amplifier; 3. a data acquisition card; 4. an electronic computer; 5. a multi-channel recorder; 6. a directional microphone.
Detailed Description
Example 1:
the invention will be described in further detail below with reference to the figures and specific examples.
A converter transformer voiceprint measuring point optimization method based on oil tank vibration signals comprises the following steps:
step 1: building a test platform: the test platform comprises more than 1 signal acquisition device, an electronic computer 4, a data acquisition card 3, a multi-channel recorder 5 and more than 1 directional microphone 6; the signal acquisition device consists of a vibration sensor 1 and a signal amplifier 2 which are cascaded; the signal amplifiers 2 can be powered by a battery or an external power supply, the output end of the data acquisition card 3 is connected with the input port of the electronic computer 4 through a network cable, the electronic computer 4 is provided with signal processing software, the directional microphone 5 is connected with the corresponding input port of the multi-channel recorder 6, and each signal amplifier 2 is connected with the electronic computer 4 through the data acquisition card 3. The voiceprint signals collected by the multi-channel recorder 6 are output to the electronic computer 4; the vibration sensors 1 are randomly distributed on the side surfaces of the oil tank, and in the embodiment, 20 vibration sensors 1 are distributed on four side surfaces of the oil tank, and each side surface is 5;
the frequency range that the vibration sensor 1 can measure is 1 to 10000Hz.
The data acquisition card 3 has not less than 32 signal interfaces.
The multichannel recorder 5 has not less than 4 microphone ports.
The multichannel recorder 5 is capable of measuring frequencies in the range of 1 to 96000Hz.
Step 2: primary measurement of vibration signals: each vibration sensor 1 collects a vibration signal;
and step 3: selecting a measurement frequency band: analyzing the frequency band distribution of the vibration signals acquired by each vibration sensor 1 in the step 1, and determining a continuous frequency band starting from 1Hz as a comparison frequency band, wherein the energy of the vibration signals in the comparison frequency band is not less than 95% of the total energy of the corresponding vibration signals;
and 4, step 4: screening vibration measuring points: screening vibration measuring points according to the maximum frequency value of the comparison frequency band, wherein the distance between the vibration measuring points is preferably not more than one half of the wavelength corresponding to the maximum frequency value;
and 5: testing a voiceprint signal: at least 50 voiceprint alternative measuring points are uniformly distributed around 4 circles of the converter transformer; a support for placing the directional microphone 5 can be arranged to serve as a voiceprint alternative measuring point, the position of the directional microphone 5 can also be moved, a voiceprint signal of the preset voiceprint measuring point and a vibration signal of the vibration measuring point are synchronously measured one by one, and the measuring time is not less than 5 seconds;
step 6: and (3) correlation coefficient calculation: calculating correlation coefficients of the voiceprint signals of the preset voiceprint measuring points and the vibration signals of the vibration measuring points, and calculating the average value of the correlation coefficients of the preset voiceprint measuring points;
and 7: the acoustic print measuring point is preferably: and respectively selecting a preset voiceprint measuring point with the largest correlation coefficient average value from 4 sides of the transformer as a voiceprint preferred measuring point.
Claims (6)
1. A converter transformer voiceprint measuring point optimization method based on oil tank vibration signals is characterized by comprising the following steps: the method comprises the following steps:
step 1: building a test platform: the test platform comprises more than 1 signal acquisition device, an electronic computer 4, a data acquisition card 3, a multi-channel recorder 5 and more than 1 directional microphone 6; the signal acquisition device consists of a vibration sensor 1 and a signal amplifier 2 which are cascaded; the output end of the data acquisition card 3 is connected with the input port of the electronic computer 4 through a network cable, the electronic computer 4 is provided with signal processing software, the directional microphone 5 is connected with the corresponding input port of the multichannel recorder 6, and the multichannel recorder 6 and each signal amplifier 2 are connected with the electronic computer 4 through the data acquisition card 3; the voiceprint signals collected by the multi-channel recorder 6 are output to the electronic computer 4; the vibration sensors 1 are randomly arranged on the side surfaces of the oil tank, and more than 1 vibration sensor 1 is arranged on each side surface.
And 2, step: primary measurement of vibration signals: each vibration sensor 1 collects a vibration signal;
and 3, step 3: selecting a measurement frequency band: analyzing the frequency band distribution of the vibration signals acquired by each vibration sensor 1 in the step 1, and determining that a continuous frequency band is used as a comparison frequency band, wherein the energy of the vibration signals in the comparison frequency band is not less than the preset proportion of the total energy of the corresponding vibration signals;
and 4, step 4: screening vibration measuring points: screening vibration measuring points according to the maximum frequency value of the comparison frequency band, wherein the distance between the vibration measuring points is preferably not more than the preset ratio of the wavelength corresponding to the maximum frequency value;
and 5: testing a voiceprint signal: at least a preset number of voiceprint alternative measuring points are uniformly distributed around 4 weeks of the converter transformer; synchronously measuring a voiceprint signal of a preset voiceprint measuring point and a vibration signal of a vibration measuring point one by one, wherein the measuring time is not less than the preset duration;
step 6: and (3) correlation coefficient calculation: calculating correlation coefficients of the voiceprint signals of the preset voiceprint measuring points and the vibration signals of the vibration measuring points, and calculating the average value of the correlation coefficients of the preset voiceprint measuring points;
and 7: the preferable sound-pattern measuring point is as follows: and respectively selecting a preset voiceprint measuring point with the largest correlation coefficient average value from 4 sides of the transformer as a voiceprint preferred measuring point.
2. The preferable method for the converter transformer voiceprint measuring point based on the oil tank vibration signal is as follows: vibration signals of 20 measuring points are randomly generated on the side surface of the oil tank in the step 1, the number of the measuring points on each side surface is not less than 5, and the signal amplifier 2 can supply power through a battery or an external power supply; the frequency range which can be measured by the vibration sensor 1 is 1-10000 Hz; the data acquisition card 3 is provided with not less than 32 signal interfaces; the multi-channel recorder 5 is provided with not less than 4 microphone interfaces; the multichannel recorder 5 is capable of measuring frequencies in the range of 1 to 96000Hz.
3. The preferable method for the converter transformer voiceprint measuring point based on the oil tank vibration signal is as follows: in the step 3, the initial frequency of the comparison frequency band is 1Hz, and the energy of the vibration signal in the comparison frequency band is not less than 95% of the total energy of the original signal.
4. The preferable method for the converter transformer voiceprint measuring point based on the oil tank vibration signal is as follows: in the step 4, the distance between the vibration measuring points is not more than one half of the wavelength corresponding to the maximum frequency value.
5. The preferable method for the converter transformer voiceprint measurement point based on the tank vibration signal as claimed in claim 1, wherein: in the step 5, not less than 50 sound pattern alternative measuring points are uniformly distributed on 4 side surfaces of the converter transformer.
6. The preferable method for the converter transformer voiceprint measuring point based on the oil tank vibration signal is as follows: in the step 5, a support for placing the directional microphone 5 can be arranged to serve as a voiceprint candidate measuring point, the directional microphone 5 can also be moved to a preset voiceprint candidate measuring point position, a voiceprint of the voiceprint measuring point and a vibration signal of the vibration measuring point are synchronously measured, and the measuring time is not less than 5 seconds.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117436293A (en) * | 2023-12-21 | 2024-01-23 | 国网浙江省电力有限公司电力科学研究院 | Low-frequency transformer measuring point simulation method based on sound field reconstruction and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117436293A (en) * | 2023-12-21 | 2024-01-23 | 国网浙江省电力有限公司电力科学研究院 | Low-frequency transformer measuring point simulation method based on sound field reconstruction and electronic equipment |
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