基金项目:
国家自然科学基金(51807166);
中央高校基本科研业务费专项资金(SWU118031);
Project supported by National Natural Science Foundation of China (51807166), Fundamental Research Funds for the Central Universities (SWU118031);
When the existing frequency response method is used for detecting transformer winding deformation faults , only the variation of amplitude-frequency characteristic signature is analyzed and processed, and the information of phase-frequency characteristic signature is neglected. In order to make up for the above shortcoming, we propose a method for diagnosing transformer winding deformation faults based on frequency response binary image. The basic principle of this method is introduced, and the diagnostic process of winding deformation fault is provided. The test platform of emulating transformer winding deformation is then established to perform 3 kinds of typical fault experiments, the amplitude-frequency characteristic and phase-frequency characteristic of measured frequency response are converted into polar plot, and the digital image processing technique is used to obtain the image correlation diagnostic indicator and criterion. Finally, the measurement cases of large power transformer are analyzed. The test result shows that the distribution of diagnostic indicators corresponding to the typical faults show classifying and clustering characteristics in a three-dimensional space, which can be used for winding fault identification. Besides, diagnostic criteria can be used to diagnose the winding faults of power transformers. The analysis conclusion indicates that the proposed method has an advantage over the common frequency response analysis method in aspect of diagnostic sensitivity.
KEY WORDS :transformer;frequency response;polar plot;digital image processing;winding deformation;fault diagnosis;
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