Method for extracting partial discharge waveform features of converter transformer

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.

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...

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Problems solved by technology

Due to the differences in structure and function between converter transformers and ordinary transformers, there is no effective method for extracting partial discharge waveform features of converter transformers: firstly, the measured partial discharge waveform files often contain some invalid files, adding The difficulty of waveform feature extraction; in addition, due to the interference of various types of noise on site, such as white noise, narrow-band noise and periodic pulse noise, the difficulty of waveform feature extraction is also increased; third, the waveform contains multi-dimensional spatial features, and only one Dimensional features do not meet the requirements

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