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Farhad Namdari
Department of Electrical Engineering, Faculty of Engineering, University of Lorestan, khorramabad
Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Modeling of Magnetizing Inrush and Internal Faults for Three-Phase Transformers Farhad Namdari; Mohammad Bakhshipour; Behroz Rezaeealam; Mohammad Sedaghat
International Journal of Advances in Applied Sciences Vol 6, No 3: September 2017
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1344.646 KB) | DOI: 10.11591/ijaas.v6.i3.pp203-212

Abstract

Among the most noticeable root causes of improper performance in power transformers, internal short circuit faults can be noted and if not quickly be identified and addressed in the accepted time interval, irrecoverable damages such as interruption or even collapse of the network connected to the power transformer would happen. In this contribution, three-phase transformer behaviors under magnetizing inrush, internal short circuit condition and their current values determination have been surveyed using electromagnetic coupling model approach and structural finite element method. Utilizing the definition of transformer in the form of multi-coil and their electromagnetic and electric couple, a three dimensional geometric model of transformer is developed which includes nonlinear characteristics of the transformer, different states of normal and under internal short circuit occurrence and the moment of magnetizing inrush creation are investigated. The comparison between obtained results of presented model simulation with the consequences of practical studies on a typical three phase transformer reveals that the proposed model has a reliable accuracy in detection and modelling the transformer behavior in normal conditions, magnetizing inrush and different types of internal faults. The proposed approach represents an accurate model of a three-phase transformer for protection aims.
Co-Authors Behroz Rezaeealam Mohammad Bakhshipour Mohammad Sedaghat