Title :
Transformer Frequency Response Analysis: A mathematical approach to interpret mid-frequency oscillations
Author :
Bagheri, Mehdi ; Naderi, M.S. ; Blackburn, Trevor ; Daming Zhang
Author_Institution :
Sch. of EE&T, UNSW, Sydney, NSW, Australia
Abstract :
Diagnosis methods have been employed to recognize transformer internal defects since many years ago. Frequency Response Analysis (FRA) has been utilized as an offline diagnosis test since last decade to investigate mechanical integrity of transformer while this technique is quite capable to provide worthy information about electromagnetic characteristics of the windings. This study has concentrated on transformer winding frequency response trace oscillations presented in Bode diagram. Mathematical approach using travelling wave theory is employed to explore frequency response trace behavior. The correlation between winding behavior in frequency domain and time domain is highlighted. Eventually, practical study has been performed on continuous and interleaved 66 kV disc windings to validate mathematical calculation.
Keywords :
Bode diagrams; fault diagnosis; frequency response; power transformers; time-frequency analysis; transformer windings; Bode diagram; FRA; electromagnetic characteristics; frequency domain; interleaved disc windings; mathematical approach; mathematical approach to; midfrequency oscillations; offline diagnosis test; time domain; transformer frequency response analysis; transformer internal defects; transformer mechanical integrity; transformer winding frequency response trace oscillations; travelling wave theory; voltage 66 kV; Abstracts; Conferences; Frequency response; Windings; Frequency response analysis; Initial impulse voltage distribution; Transformer; Winding structure;
Conference_Titel :
Power and Energy (PECon), 2012 IEEE International Conference on
Conference_Location :
Kota Kinabalu
Print_ISBN :
978-1-4673-5017-4
DOI :
10.1109/PECon.2012.6450357
