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Method for filtering noise interference based on partial discharge signal of electrical equipment

A technology for filtering out noise and discharge signals, which is applied in the field of signal processing, and can solve problems such as poor partial discharge detection results and difficulties in extracting electrical feature quantities

Inactive Publication Date: 2021-04-30
JIANGSU ELECTRIC POWER CO
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  • Claims
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Problems solved by technology

[0003] Due to the weak partial discharge signal itself and the electromagnetic interference on site, it is very difficult to extract electrical feature quantities, especially in substations and other occasions, where there are corona discharges from external charged bodies, grounding systems, carrier communication, etc. The strong noise formed makes the detection effect of most partial discharges not very good

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  • Method for filtering noise interference based on partial discharge signal of electrical equipment
  • Method for filtering noise interference based on partial discharge signal of electrical equipment
  • Method for filtering noise interference based on partial discharge signal of electrical equipment

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Embodiment Construction

[0022] A specific implementation of a method for filtering out noise interference based on electrical equipment partial discharge signals according to the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the present invention provides a method for filtering out noise interference based on partial discharge signals of electrical equipment, and the method for filtering out noise interference includes the following steps:

[0024] Step (1): collecting partial discharge current signals through sensors;

[0025] Step (2): carry out A / D conversion through the A / D converter, and input the signal processing unit;

[0026] Step (3): the signal processing unit from the preset wavelet library DB={db i i=1,2···10}, select the wavelet sequentially to decompose the collected signal by wavelet;

[0027] Step (4): Calculate the Shannon information entropy of the signal in the approximation space p(i) is...

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Abstract

The invention provides a method for filtering noise interference based on a partial discharge signal of electrical equipment, and the method comprises the steps: obtaining a minimum wave base with the greater correlation with the partial discharge signal through employing a Shannon information entropy, carrying out the wavelet decomposition of a collected signal, and promoting the separation of the signal and noise; filtering out noise signals through a threshold function, narrow-band interference signals are filtered out through a cascade digital wave trap, noise interference is effectively filtered out, so that the partial discharge signal extraction effect is improved. The invention provides a method for filtering noise interference based on a partial discharge signal of electrical equipment, which can better separate the partial discharge signal from a noise signal and improve the applicability of partial discharge signal extraction.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a method for filtering out noise interference based on partial discharge signals of electrical equipment. Background technique [0002] With the development of science and technology, more and more electrical equipment is used by people, and the insulation of electrical equipment is an important guarantee for its safe and reliable work. According to statistics, about 2 / 3 of power grid accidents are caused by the insulation failure of electrical equipment. Affected by different factors, the insulating medium of electrical equipment will be aged or damaged to varying degrees. Under the action of a strong electric field, the insulating medium will be broken down, causing grid failure. Experiments show that the parameters of partial discharge have high sensitivity and can effectively reflect the insulation status of electrical equipment. [0003] Due to the weak partial d...

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Application Information

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IPC IPC(8): G06K9/00G01R31/12
CPCG01R31/1227G06F2218/06
Inventor 潘一藩徐以超吴小刚
Owner JIANGSU ELECTRIC POWER CO
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