Method for extracting partial discharge waveform features of converter transformer

A converter transformer and partial discharge technology, applied in the direction of testing dielectric strength, etc., can solve the problems of increasing the difficulty of waveform feature extraction, increasing the difficulty of waveform feature extraction, etc., to solve the problem of partial discharge waveform feature extraction, and feature information is comprehensive and detailed Effect

CN104020398AActive Publication Date: 2014-09-03NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-09-03

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Abstract

The invention belongs to the technical field of partial discharge detection of high-voltage direct-current transmission equipment, discloses a method for extracting partial discharge waveform features of a converter transformer, and particularly relates to the method for extracting the partial discharge waveform features of the converter transformer on the basis of a multi-element feature extraction package. The method includes the steps that a file is read, screened and processed in advance, the multi-element feature extraction package is called, discharge waveform time-frequency spatial features are obtained, and the extracted partial discharge waveform spatial features are integrated and stored. The method is applied to partial discharge detection and insulation defect diagnosis of the converter transformer in a high-voltage direct-current transmission system. According to the purpose of partial discharge waveform feature extraction of the converter transformer, the concept that the multi-element feature extraction package is called is adopted, and the effective achieving method is provided. The method overcomes the defects of an existing method for extracting the partial discharge waveform features of the converter transformer and has the advantages of being rapid and accurate and features are comprehensive and detailed.
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Description

technical field

[0001] The invention belongs to the technical field of partial discharge detection of high-voltage direct current transmission equipment, and in particular relates to a method for extracting partial discharge waveform features of a converter transformer, in particular to a method for extracting partial discharge waveform features of a converter transformer based on a multiple feature extraction package. Background technique

[0002] The converter transformer is the key equipment in the HVDC transmission system and the core equipment of the interface between the converter and the inverter in the AC and DC transmission systems. Its investment and safe operation are the key and important guarantee for the project to obtain power generation benefits. Oil-paper insulation is the main form of insulation for converter transformers. Due to the special functions of converter transformers, the insulation withstands more complex voltages, including not only AC voltage, b...

Examples

Embodiment Construction

[0024] The present invention provides a method for extracting partial discharge waveform features of converter transformers. The so-called partial discharge waveform feature extraction of converter transformers in the present invention refers to the establishment of a specific function method to identify discharge waveforms caused by insulation defects in converter transformers, and extract the waveforms that can represent An essential characteristic of a waveform having its own information. Describe below in conjunction with accompanying drawing.

[0025] Such as figure 1 As shown, the method of the present invention is a method for extracting partial discharge waveform features of converter transformers based on multiple feature extraction packages, and the specific steps include:

[0026] Step 1): Address the partial discharge waveform file group, read the waveform file, and import the file into the detection system;

[0027] Step 2): Retrieve files, screen information fi...