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Crosslinked polyethylene high-voltage cable partial discharge feature extraction method

A technology of cross-linked polyethylene and high-voltage cables, which is applied in the direction of testing dielectric strength, electrical digital data processing, and special data processing applications. The effect of extraction precision

Active Publication Date: 2015-07-08
NORTHEAST DIANLI UNIVERSITY +2
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of inaccurate extraction of partial discharge characteristics existing in the current high-voltage cable partial discharge detection method, and to provide a method for extracting partial discharge characteristics of high-voltage cables

Method used

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  • Crosslinked polyethylene high-voltage cable partial discharge feature extraction method
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  • Crosslinked polyethylene high-voltage cable partial discharge feature extraction method

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Embodiment Construction

[0027] The steps of the present invention are:

[0028] a. Signal conversion: 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;

[0029] b. Filtering: use a digital bandpass filter to filter the obtained 16-bit digital signal to obtain a 16-bit digital signal with a frequency range of 0.5 ~ 20MHz;

[0030] c. Perform DB4 wavelet packet decomposition on the 16-bit digital signal (see claim 2 for the selection range of wavelet packet decomposition layers), so that the different frequency components of the 16-bit digital signal are correspondingly distributed in different wavelet packet scales ( For example, after 4 layers of wavelet packet decomposition, the original signal is allocated to 16 corresponding frequency bands: (0~1.25MHz), (1.25~2.50 MHz), (2.50~3.75 MHz), (3.75~5.00 MHz), (5.00~ 6.25 MHz), (6.25~7.50 M...

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Abstract

The invention provides a crosslinked polyethylene high-voltage cable partial discharge feature extraction method, and belongs to the technical field of high-voltage cables. The high-voltage cable partial discharge feature extraction method aims to solve the problem that partial discharge feature extraction is inaccurate in an existing high-voltage cable partial detection method. According to the method, firstly, metal sheath grounding current signals generated when crosslinked polyethylene high-voltage cable partial discharge happens is acquired through a high-frequency current mutual inductor; then, current signals are converted into digital signals; next, wavelet packet decomposition is conducted on the digital signals, modulus maxima extraction and singularity detection are sequentially conducted on decomposed wavelet packet node coefficients or reconstructed signals, and wavelet packet energy index entropy calculation is conducted; finally, a discharge feature curve is drawn according to the operation result, and crosslinked polyethylene high-voltage cable partial discharge feature extraction is achieved. By means of the crosslinked polyethylene high-voltage cable partial discharge feature extraction method, the cable partial discharge feature extraction accuracy can be improved, and technical support is provided for next high-voltage cable partial discharge.

Description

technical field [0001] The invention belongs to the technical field of high voltage cables. Background technique [0002] The partial discharge (PD) inside the XLPE high voltage power cable (hereinafter referred to as the cable) refers to the discharge phenomenon in a certain area of ​​the cable insulation structure, which will cause damage to the insulation structure of the cable in this area , if partial discharge (hereinafter referred to as partial discharge) exists for a long time, 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 online acquisition method for partial discharge signals of high-voltage cables is mainly the broadband electromagnetic coupling method, which uses high-frequency current transformers (HFCT) to collect the pulse current of the cable sheath to the ground when partial discharge occurs...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01R31/12
Inventor 陈继开李国庆张喜林王振浩庞丹李扬王朝斌刘博文
Owner NORTHEAST DIANLI UNIVERSITY
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