Sharif University of Technology Scientia Iranica 1026-3098 15 2 2008 04 01 New Wavelet-Based Approach for Internal Fault Current Identication in Power Transformers 2964 EN H. Monsef Department of Electrical Engineering,University of Tehran Journal Article 2009 05 30 This paper demonstrates a novel approach for the dierential protection of power transformers. This method uses the Wavelet Transform (WT) and the Adaptive Network-based Fuzzy Inference System (ANFIS) to detect a fault current from an inrush current. The proposed method has been designed, based on the dierences between the amplitudes of wavelet transform coecients in a special band of frequency that is caused by faults and inrush currents. The performance of this algorithm has been simulated and tested under dierent conditions of the switching on of power transformers, using the PSCAD/EMTDC environment software. https://scientiairanica.sharif.edu/article_2964_b30a76c9bb0b466e32ead8eab8c54faa.pdf