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Understanding power transformer frequency response analysis signatures

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Authors
Abu Siada, Ahmed
Hashemnia, Naser
Islam, Syed
Masoum, Mohammad
Date
2013
Type
Journal Article

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Abu Siada, A. and Hashemnia, N. and Islam, S. and Masoum, Mohammad A.S. 2013. Understanding power transformer frequency response analysis signatures. IEEE Electrical Insulation Magazine. 29 (3): pp. 48-56.
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IEEE Electrical Insulation Magazine
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Abstract

This paper presents a comprehensive analysis of the effects of various faults on the FRA signatures of a transformer simulated by a high-frequency model. The faults were simulated through changes in the values of some of the electrical components in the model. It was found that radial displacement of a winding alters the FRA signature over the entire frequency range (10 Hz-1 MHz), whereas changes due to axial displacement occur only at frequencies above 200 kHz. A Table listing various transformer faults and the associated changes in the FRA signature was compiled and could be used in the formulation of standard codes for power transformer FRA signature interpretation.