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access icon free Feature parameters extraction of power transformer PD signal based on texture features in TF representation

© The Institution of Engineering and Technology
Received 12/08/2016, Accepted 21/02/2017, Revised 11/01/2017, Published 22/02/2017

Ultra-high-frequency (UHF) method is an effective approach to power transformer partial discharge (PD) detection. The feature parameters extracted from UHF PD signal can be applied to insulation defect type recognition. In this study, a novel feature parameters extraction method based on texture features in time–frequency (TF) representation is proposed. PD detections of four typical insulation defects were performed on a 110 kV oil-immersed power transformer. Time-domain waveform and corresponding TF representations or images of UHF PD signals were obtained. About 36 texture features were extracted from the grey-level co-occurrence matrix of TF images. The texture features were reduced into six new feature parameters by principal component analysis. These feature parameters were used as input of the support vector machine classifier for defect type recognition. The recognition accuracies of four kinds of typical defects reached 97.67, 97.00 97.67 and 98.33% proving that the proposed extracted feature parameters are suitable for insulation defect type recognition in power transformer.

Inspec keywords: time-frequency analysis; principal component analysis; partial discharge measurement; support vector machines; power transformers; feature extraction

Other keywords: power transformer partial discharge detection; ultrahigh-frequency method; time-domain waveform; principal component analysis; feature parameter extraction; support vector machine classifier; defect type recognition; time–frequency representation; grey-level cooccurrence matrix; texture features

Subjects: Other topics in statistics; Signal processing and detection; Transformers and reactors; Mathematical analysis; Dielectric breakdown and discharges; Charge measurement; Digital signal processing; Knowledge engineering techniques; Mathematical analysis; Other topics in statistics

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