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Method and system for denoising partial discharge signal of power cable and extracting effective signal

A technology for discharging signals and power cables, which is applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., to reduce the loss of high-frequency information, suppress white noise and impulse noise, and reduce oscillation problems.

Inactive Publication Date: 2019-01-18
康威通信技术股份有限公司
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Problems solved by technology

[0005] In order to solve the above problems, this disclosure proposes a power cable partial discharge signal denoising and effective signal extraction method and system, through the proposed new threshold function, it can overcome the problems existing in the existing hard threshold method and soft threshold method It can realize the denoising processing of the cable operation data laid in the cable trench or directly buried in the ground, extract effective signals, realize accurate positioning of cable faults, find fault points in a timely and effective manner, and ensure the safe and effective operation of power facilities

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  • Method and system for denoising partial discharge signal of power cable and extracting effective signal

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[0030] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0032] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combin...

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Abstract

The invention discloses a method and a system for denoising partial discharge signals of power cables and extracting effective signals. A new threshold function is proposed to perform threshold processing on wavelet coefficients after wavelet decomposition. The problems existing in an existing hard threshold method and a soft threshold method for processing signals can be solved. Denoising processing and extraction of the effective signals can be performed on cable operation data laid in the cable trench or directly buried underground. Accurate positioning of cable faults is realized, and fault points are effectively found out in time, thereby guaranteeing safe and effective operation of electric power facilities.

Description

technical field [0001] The present disclosure relates to a method for processing a partial discharge signal of a power cable, and in particular, to a method and system for denoising a partial discharge signal of a power cable and extracting an effective signal. Background technique [0002] In recent years, with the continuous transformation of my country's urban power grids, XLPE power cables, as a mainstream product of power cables, have been widely used in transmission lines and distribution networks. According to incomplete statistics, hundreds of kilometers of high-voltage cable lines of 110KV and above have been put into operation, while the voltage level of 35KV and below is as many as 500,000 kilometers, and the highest voltage level has reached 500KV. It is generally believed that the life of XLPE power cables in normal environments is 20 to 30 years. However, since the cables are laid in cable trenches or directly buried underground, the laying environment and usag...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 赵庆冲杨震威郑元勋
Owner 康威通信技术股份有限公司
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