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Method for improving sound measurement precision of transformer

A measurement accuracy, transformer technology, applied in measurement devices, measurement of ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as external sound interference, and achieve the effect of suppressing external interference sound, easy to use, and high measurement accuracy

Pending Publication Date: 2022-03-01
STATE GRID JIANGSU ELECTRIC POWER CO LTD SUQIAN POWER SUPPLY BRANCH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a method for improving the accuracy of transformer sound measurement, and its purpose is to solve the problem of being easily disturbed by external sound in the process of transformer sound measurement in the prior art

Method used

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  • Method for improving sound measurement precision of transformer
  • Method for improving sound measurement precision of transformer
  • Method for improving sound measurement precision of transformer

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Embodiment Construction

[0035] see figure 1 , the implementation steps of the method for improving transformer sound measurement accuracy in this embodiment include:

[0036] 1) Set the sampling frequency and sampling time to detect the transformer acoustic signal S 1 ;

[0037] 2) Select the first cut-off frequency, design a 6-order Butterworth high-pass digital filter Filter1, and obtain the transformer acoustic signal S after eliminating wind noise 2 ;

[0038] 3) Select the second cut-off frequency, design a 6th-order Butterworth low-pass digital filter Filter2, and obtain the transformer frequency band acoustic signal S 3 ;

[0039] 4) Select the third cut-off frequency, design the 6th-order Butterworth low-pass filter Filter3 and the 6th-order Butterworth high-pass filter Filter4 for the transformer frequency band acoustic signal S 3 process to obtain the low-frequency band acoustic signal S 4 with the high frequency band acoustic signal S 5 ;

[0040] 5) For the low frequency band acou...

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Abstract

The invention relates to a method for improving the sound measurement precision of a transformer, which comprises the following steps of: 1) setting sampling frequency and sampling time, and detecting a sound signal S1 of the transformer; 2) selecting a first cut-off frequency, designing a Butterworth high-pass digital filter 1, and obtaining a transformer sound signal S2 after the wind noise is eliminated; 3) selecting a second cut-off frequency, designing a Butterworth low-pass digital filter Filter2, and obtaining a transformer frequency band sound signal S3; 4) selecting a third cut-off frequency, designing a Butterworth low-pass filter Filter3 and a Butterworth high-pass filter Filter4, and respectively acquiring a low-frequency-band sound signal S4 and a high-frequency-band sound signal S5; 5) performing Weiner filtering enhancement processing to obtain enhanced signals of the low-frequency-band sound signal S4 and the high-frequency-band sound signal S5; and 6) carrying out sound pressure level calculation on the enhanced signal, and calculating the total sound pressure level of the transformer.

Description

technical field [0001] The invention relates to a method for improving the measurement accuracy of transformer sound, which belongs to the transformer sound detection technology. Background technique [0002] Transformer operation failure is the key cause of large-scale power outages in the power system. According to DL / T 573-2010 "Guidelines for Maintenance of Power Transformers", transformer overload, unbalanced load, harmonic load, severe overheating, DC bias, partial discharge, Various defects such as loose winding core and loose accessories are related to the sound of transformer operation; accurate measurement of transformer operating sound is of great significance for its operating state evaluation and fault diagnosis; however, the transformer sound detection process is easily interfered by external environmental factors, including Driving vehicles, chirping of birds, chirping of insects, chirping of frogs, etc. have caused problems such as difficulty in carrying out ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00H03H17/02
CPCG01H17/00H03H17/0286
Inventor 韩少华万新强赖勇庞吉年毛王清夏睿刘刚葛蕾赵航宇陈秋平
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD SUQIAN POWER SUPPLY BRANCH
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