The phenomenal growth of power systems has put burden on the transformer industry to supply consistent and cost-effective transformers. Any failure of a transformer or its component will impair the system performance and social setup. The reliability of a transformer is a major concern to users and manufacturers for ensuring a trouble-free performance during service. Magnetic circuit is considered as the most active component of the transformer. It consists of iron core and carries flux associated to the windings. It is important to understand the connection between iron core and leakage flux to get a better design of Transformer. Some of the limitation of using transformer is expenditure by some losses in core. By solving this difficulty it can save more energy. This paper presents a numerical technique for calculating the core losses and its reduction.

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Finite Element Method Transformer Core Losses.