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A Feature Extraction Method for Partial Discharge of XLPE High Voltage Cable

A technology for cross-linked polyethylene and high-voltage cables, which is used in testing dielectric strength, electrical digital data processing, special data processing applications, etc. The effect of extraction accuracy

Active Publication Date: 2017-11-10
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

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  • A Feature Extraction Method for Partial Discharge of XLPE High Voltage Cable
  • A Feature Extraction Method for Partial Discharge of XLPE High Voltage Cable
  • A Feature Extraction Method for Partial Discharge of XLPE High Voltage Cable

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Embodiment Construction

[0025] The steps of the present invention are:

[0026] 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;

[0027] 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;

[0028] C, carry out DB4 wavelet packet decomposition to described 16-bit digital signal (wavelet packet decomposition layer number selection range sees 2 in the claim), make the different frequency components of 16-bit digital signal be distributed in different wavelet packet scales accordingly ( For example, after 4 layers of wavelet packet decomposition, the original signal is allocated to 16 corresponding frequency bands: (0~1.25MHz), (1.25~2.50MHz), (2.50~3.75MHz), (3.75~5.00MHz), (5.00~ 6.25MHz), (6.25~7.50MHz), (7....

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Abstract

A method for extracting partial discharge characteristics of cross-linked polyethylene high-voltage cables belongs to the technical field of high-voltage cables. The purpose of the present invention is to solve the problem of inaccurate extraction of partial discharge features existing in the current partial discharge detection method for high-voltage cables, and to provide a method for extracting partial discharge features of high-voltage cables. The present invention first utilizes the high-frequency current transformer to realize the acquisition of the metal sheath grounding current signal when the partial discharge of the cross-linked polyethylene high-voltage cable occurs, and then converts the current signal into a digital signal, and then decomposes the digital signal into a wavelet packet and analyzes the The decomposed wavelet packet node coefficients or reconstructed signals are sequentially subjected to modulus maximum extraction and singularity detection, and wavelet packet energy index entropy calculation is performed. Finally, discharge characteristic curves are drawn according to the calculation results to realize the partial discharge characteristics of XLPE high-voltage cables. extraction. The invention can improve the extraction accuracy of cable partial discharge features, and provide technical support for the identification of high-voltage cable partial discharge in the next step.

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 the 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 high-voltage cable partial discharge signals is mainly a broadband electromagnetic coupling method, which uses a high-frequency current transformer (HFCT) to collect the pulse current of the cable sheath to the ground when partial discharge occurs. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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