Portal de Periódicos da CAPES

Feature Difference Index Analysis on Frequency Response Fingerprint of Transformer Windings

2010; Power System Technology Press; Linguagem: Inglês

1000-3673

Yuan Xu,

Power Quality and Harmonics

Frequency response analysis is an important method to detect transformer winding deformation.Experienced professionals can judge the winding deformation accurately by analyzing feature differences of transformer wingding frequency response fingerprint.Based on main points of experience,a new method to quantitatively analyze feature differences of frequency response fingerprint is proposed.Firstly,the amplitude difference is represented by amplitude difference index and the frequency difference is represented by frequency difference index;secondly,the feature difference indices are calculated by amplitude difference index and frequency difference index respectively;finally,transformer winding deformation can be judged through the feature difference indices.Verification results of more than 500 sets of diagnostic data show that the proposed method is evidently better than existing quantitative analysis method,and high judging accuracy can be attained.