JEE_V1_N2_RP9 N. Prema Kumar Jinka Amarnath Journal on Electrical Engineering 2230 – 7176 1 2 95 103 Transformer windings, incipient faults, wavelet transform, frequency response analysis, low voltage impulse The aim of this research is to detect incipient faults like turn to turn faults in the windings of power transformer using Wavelet transform technique. An experimental procedure of frequency response analysis (FRA) test is conducted on the windings of power transformer by applying impulse voltage of 1.2/50µs wave and the winding neutral currents are recorded. The recorded waveforms are convoluted into wavelet domain and the winding deformations are identified. Different incipient faults have been simulated using SPICE software and the waveforms are analyzed using MATLAB WAVELET toolbox. Experiments and simulations are carried out on a 61MVA, 230kV class transformer winding to identify the winding deformations on the characteristics of transformer. In this paper simulated results for discrete wavelet transform have been presented for fault identification. By using this technique, exact time of fault where it is occurred can be identified. By knowing the exact time of fault occurrence, we can detect the exact location of the fault. October - December 2007 Copyright © 2007 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=446