Early Detection of Turn-to-Turn Faults in Power Transformer Winding: An Experimental Study

Turn-to-turn insulations of transformer windings may degrade gradually because of mechanical forces, thermal stresses or chemical corrosion. Degradation decreases impedances of inter-turn insulations that finally may lead to a solid turn-to-turn short circuit. In this paper, early detection of turn-to-turn faults in transformers windings has been studied, in its high-impedance stage, using Artificial Neural Networks (ANN) based on its Frequency...