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Cable partial discharge feature extraction method based on wavelet packet survival index singular entropy

A feature extraction and cable partial discharge technology, applied in the field of power cables, can solve the problem of inaccurate partial discharge feature extraction and achieve the effect of improving the extraction accuracy

Active Publication Date: 2016-09-28
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to solve the inaccurate problem of partial discharge feature extraction existing in the current high voltage cable partial discharge detection method by extracting the partial discharge feature of the high voltage cable, and to extract the cable partial discharge feature based on the singular entropy of the wavelet packet survival index

Method used

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  • Cable partial discharge feature extraction method based on wavelet packet survival index singular entropy
  • Cable partial discharge feature extraction method based on wavelet packet survival index singular entropy
  • Cable partial discharge feature extraction method based on wavelet packet survival index singular entropy

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example

[0042] to signals containing cable PD characteristics (such as figure 1 shown) and signals that do not contain cable PD characteristics (such as image 3 shown) as an example, verify it. The time to collect data is 2s.

[0043] 1. Use the HFCT sensor to collect the ground current signal of the cable sheath and convert it into a voltage signal, and use the analog-to-digital converter to convert the voltage signal into a 16-bit digital signal;

[0044] 2. Use a digital band-pass filter to filter the obtained 16-bit digital signal to obtain a 16-bit digital signal with a frequency range of 0 ~ 50MHz.

[0045] 3. Use MATLAB to perform DB4 wavelet packet 3 layers on the 16-bit digital signal ( ) decomposition, so that the different frequency components of the 16-bit digital signal are correspondingly distributed in different wavelet packet scales, and then the partial discharge feature information is extracted from the wavelet packet node coefficients obtained by the wavelet p...

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Abstract

Provided is a cable partial discharge feature extraction method based on wavelet packet survival index singular entropy, belonging to the technical field of power cables and aiming to solve the problem of inaccurate extraction of partial discharge features in a conventional high-voltage cable partial discharge detection method by extracting the partial discharge features of high-voltage cables. The method includes that a 16-bit digital signal with the frequency range of 0-50MHz is obtained, and the survival index singular entropy is calculated, the singular value decomposition is carried out according to a matrix singular value decomposition theory, survival multivariate functions are calculated, and the wavelet packet survival index singular entropy is calculated. The wavelet packet energy index entropy is the singular entropy calculation of wavelet packet node coefficients or reconstructed signals, so that the problem that undefined and zero values in the information entropy are defined by logarithms can be effectively avoided, and the shortcoming of Shannon entropy is overcome.

Description

technical field [0001] The invention belongs to the technical field of power cables. Background technique [0002] The partial discharge inside the XLPE high-voltage power cable (hereinafter referred to as the cable) refers to the discharge phenomenon that occurs in a certain area of ​​the cable insulation structure. This discharge will cause damage to the insulation structure of the cable in the area. If the partial discharge (hereinafter referred to as Partial discharge for short) exists for a long time, and under certain conditions, it may cause a decrease in the electrical strength of the cable's main insulation, and in severe cases, it will cause a penetrating breakdown of the cable's main insulation. At present, the cable partial discharge signal acquisition method is mainly the broadband electromagnetic coupling method, which uses the high frequency current transformer (HFCT) to collect the pulse current of the cable sheath to the ground when the partial discharge occ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 陈继开窦延辉王振浩李扬辛业春王鹤
Owner NORTHEAST DIANLI UNIVERSITY
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