The Influence of the Window Width on FRA Assessment with Numerical Indices

Szymon Banaszak, Eugeniusz Kornatowski and Wojciech Szoka
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Szymon Banaszak: Faculty of Electrical Engineering, West Pomeranian University of Technology, 70-310 Szczecin, Poland
Eugeniusz Kornatowski: Faculty of Electrical Engineering, West Pomeranian University of Technology, 70-310 Szczecin, Poland
Wojciech Szoka: Faculty of Electrical Engineering, West Pomeranian University of Technology, 70-310 Szczecin, Poland

Energies, 2021, vol. 14, issue 2, 1-18

Abstract: Frequency response analysis is a method used in transformer diagnostics for the detection of mechanical faults or short-circuits in windings. The interpretation of test results is often performed with the application of numerical indices. However, usually these indices are used for the whole frequency range of the recorded data, returning a single number. Such an approach is inaccurate and may lead to mistakes in the interpretation. An alternative quality assessment is based on the estimation of the local values of the quality index with the moving window method. In this paper, the authors analyse the influence of the width of the input data window for four numerical indices. The analysis is based on the data measured on the transformer with deformations introduced into the winding and also for a 10 MVA transformer measured under industrial conditions. For the first unit the analysis is performed for various window widths and for various extents of the deformation, while in the case of the second the real differences between the frequency response curves are being analysed. On the basis of the results it was found that the choice of the data window width significantly influences the quality of the analysis results and the rules for elements number selection differ for various numerical indices.

Keywords: transformer winding; deformation; frequency response analysis (FRA); numerical index; window width (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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