Ultrasonic echo denoising method for ultrasonic testing of transformer high voltage bushing lead

A high-voltage bushing and ultrasonic echo technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids and detect response signals, etc., can solve problems such as large amount of calculation, easy to be interfered, poor adaptability, and inaccurate threshold values

CN109580787AActive Publication Date: 2019-04-05GUANGAN POWER SUPPLY COMPANY STATE GRID SICHUANELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-04-05

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Abstract

The invention relates to an ultrasonic echo denoising method for ultrasonic testing of a transformer high voltage bushing lead. The method comprises the steps of: (1) performing wavelet decompositionon a ultrasonic echo signal reflected by a transformer high voltage bushing lead; (2) performing denoising preprocessing on the ultrasonic echo signal; (3) performing EEMD decomposition on the denoising preprocessed echo signal to obtain a multi-layer IMF component; 4) solving the noise component standard deviation of the denoising preprocessed signal, wherein the first two layers of the IMF component filter the noise in the signal by using a new method "2 sigma rule", and remaining IMF component denoise using an adaptive threshold; (5) calculating a correlation coefficient between the twice denoised IMF component and original component, selecting the IMF component to be retained according to the coefficient for a signal reconstruction, and obtaining the denoised ultrasonic echo signal. Compared with the prior art, the method can effectively filter out random noise in the ultrasonic echo signal, maximize the integrity of the echo signal, and better recognize the oscillation starting position of the echo signal.
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Description

technical field

[0001] The invention relates to the field of ultrasonic detection of transformer high-voltage bushing lead wires, in particular to an ultrasonic echo denoising method for ultrasonic detection of transformer high-voltage bushing lead wires. Background technique

[0002] As the key equipment of the power system, the power transformer is closely related to the safety and stability of the power system. The high-voltage bushing is an important part of the power transformer. The lead wire of the transformer winding must pass through the insulating sleeve to connect to the external circuit. The high voltage bushing is the insulation between the lead wires and between the lead wire and the oil tank, and plays the role of fixing the lead wire. During the operation of the equipment, the high-voltage bushing has to bear the effects of various factors such as heat, electricity, chemistry, and machinery for a long time, resulting in the deterioration of the insulation and...

Examples

Embodiment Construction

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0067] This example proposes an ultrasonic echo denoising algorithm for ultrasonic detection of transformer high-voltage bushing leads. The flow chart is as follows figure 1 shown, including the following steps:

[0068] Step S100: Perform wavelet decomposition on the ultrasonic echo signal reflected by the lead wire of the high voltage bushing of the transformer, and analyze the signal from the detail component and the approximate component, specifically ...