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Noise reduction processing method for cable local discharging signal

A discharge signal and processing method technology, applied in the direction of testing dielectric strength, etc., can solve problems such as inability to effectively achieve denoising, inability to process white noise, inability to accurately locate and classify partial discharges, etc.

Inactive Publication Date: 2015-12-23
SUZHOU GUANGGE EQUIP
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Problems solved by technology

The Fourier analysis method is a periodic global transformation, which is insensitive to local changes in the signal; wavelet or wavelet packet analysis can remove white noise very well, but cannot effectively remove narrow-band noise; the empirical mode analysis method is to deal with multi-frequency narrow-band Efficient method for noise, cannot handle white noise
Therefore, when white noise and narrow-band noise whose amplitude frequency varies irregularly with time exist at the same time, none of the above methods can effectively achieve denoising, and cannot accurately locate and classify partial discharges.

Method used

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  • Noise reduction processing method for cable local discharging signal
  • Noise reduction processing method for cable local discharging signal
  • Noise reduction processing method for cable local discharging signal

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] Usually the original collected partial discharge signal x(t) is superimposed with white noise and narrow-band noise whose amplitude frequency varies irregularly with time. Wavelet analysis is an effective method to remove white noise, but when narrowband noise and white noise exist at the same time and the frequency of narrowband noise is high, wavelet denoising will fail.

[0026] For this, as figure 1 As shown, the denoising processing method of cable partial discharge signal in one embodiment includes step S120 to step S180.

[0027] Step S120, collecting the partial discharge signal x(t) of the cable;

[0028] Step S140, using the convolution vector a to filter the discharge signal x(t), and obtain the filtered discharge signal y(t); ...

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Abstract

The invention relates to a method which can effectively eliminate narrowband noise and white noise in the cable local discharging signal. The method comprises steps of signal filtering pretreatment, wavelet threshold noise reduction and deconvolution. The narrowband noise and the white noise whose amplitude and frequency are irregularly changed can be well restrained.

Description

technical field [0001] The invention relates to the field of cable partial discharge detection, in particular to a denoising processing method for cable partial discharge signals. Background technique [0002] High-voltage cables are the main way of power transmission, and the normal operation of the cables is the basis of the power supply system. The phenomenon of partial discharge will cause different degrees of damage to cables, affect the transmission and use of electric energy, and cause economic losses. Therefore, partial discharge detection is one of the guarantees for the normal operation of the power cable system. [0003] The causes of cable partial discharge include local moisture in the cable, insulation damage, air bubbles in the cable head, and burrs on the cable surface. Each type of partial discharge corresponds to a different characteristic of the partial discharge signal. Therefore, the localization and classification of the partial discharge can be reali...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 顾一驰钱俊波韩叶祥
Owner SUZHOU GUANGGE EQUIP
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