Computation of Transformer Losses under the Effects of Non- Sinusoidal Currents

Transformers are normally designed and built for use at rated frequency and perfect sinusoidal load current. A non-linear load on a transformer leads to harmonic power losses which cause increased operational costs and additional heating in power system components. It leads to higher losses, early fatigue of insulation, premature failure and reduction of the useful life of the transformer. To prevent these problems, the rated capacity of transformer which supplies harmonic loads must be reduced. In this work a typical 100 KVA three phase distribution transformer with real practical parameters is taken under non-linear loads generated due to domestic loads. The equivalent losses and capacity of the distribution transformer is evaluated using the conventional method & also by using soft computing technique using MATLAB simulation based on valid model of transformer under harmonic conditions. And finally a relation associated with transformer losses and life assessments are reviewed & analyzed and then a comparison is being carried out on the results obtained by both the methods. KEYWORDS-Transformer losses; Harmonic loads; Derating;