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A method and device for extracting partial discharge features of high-voltage power equipment

A high-voltage power equipment and partial discharge technology, applied in the field of high-voltage electricity, can solve the problems of modal aliasing, sampling frequency influence, and low precision

Active Publication Date: 2018-08-10
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing partial discharge signal feature extraction method has modal aliasing in the process of decomposing the partial discharge signal, and cannot correctly separate components with similar frequencies, and is affected by the sampling frequency, so its accuracy is low

Method used

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  • A method and device for extracting partial discharge features of high-voltage power equipment
  • A method and device for extracting partial discharge features of high-voltage power equipment
  • A method and device for extracting partial discharge features of high-voltage power equipment

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Embodiment Construction

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0059] see figure 1 A schematic flow chart of a method for extracting partial discharge features of high-voltage power equipment disclosed by an embodiment of the present invention is shown.

[0060] In this embodiment, the method includes:

[0061] S1: Obtain sample signals of partial discharge of high-voltage power equipment.

[0062] The partial discharge signal types of high-voltage power equipment are divided into: internal discharge and external discha...

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Abstract

The invention discloses a high-voltage power equipment partial discharge feature extraction method and apparatus. According to the method, after sample signals of partial discharge of high-voltage power equipment are obtained, multiple modal components of the sample signals are obtained by performing VMD on the sample signals. Accordingly, effective modal components are obtained by performing denoising on the modal components on the basis of an ICA algorithm and a threshold denoising method, and features of the partial discharge are represented by use of the feature quantity PMSE of the effective modal components. The VMD can help to realize adaptive decomposition of signals, such disadvantages of modal mixing and sampling frequency influences and the like do not exist, components of close frequencies can be well distinguished and separated, the noise robustness is better, an optimal decomposition effect can be realized, and the precision of feature extraction of partial discharge signals is improved.

Description

technical field [0001] The present application relates to the field of high-voltage electricity, and more specifically, to a method and device for extracting partial discharge features of high-voltage power equipment. Background technique [0002] The operating status of high-voltage power equipment is directly related to the safe operation of the entire power system. In field operation, partial discharge is one of the important reasons for the insulation degradation of high-voltage power equipment, especially as the capacity and voltage level of power equipment continue to increase, this problem becomes more serious. The detection and pattern recognition of partial discharge are important means to detect the insulation state of power transformers. The detection and pattern recognition of partial discharge signals can detect latent faults in high-voltage power equipment in time, which is of great significance to ensure the safe operation of equipment. Among them, feature e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 朱永利贾亚飞赵雪松陈华黄晓胤周磊于文博郑建钢郭昕阳李宁
Owner STATE GRID CORP OF CHINA
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