Transformer is one of the major elements of the power system network. Even though the transformers are designed with high efficiency, at very high ratings improvements are still needed in its design for economic and technical reasons. With the appearance of deregulation, Transformer predictive maintenance is becoming more important for utilities to prevent forced outages with the consequential costs. To detect and diagnose the Transformer internal fault requires a Transformer model to

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... simulate these faults. This paper presents a Finite Element Method (FEM) based analysis of internal winding faults in a transformer. The transformer with a turn-to-turn fault is modeled using FEM. The comparison of results is done with practically available data and validates the FEM results for the evaluation of leakage reactance to analyze internal faults and short circuit currents in a Transformer. This is a 31.5 MVA, 132KV/33 KV unit and a YNd11 connection, ONAF cooled,3 Φ transformer.