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In this paper, losses due to linear load has been calculated using analytical and simulation method and also losses due to harmonic load current has been calculated by analytical method .Transformer is basic component of power system and it is usually constructed and basically designed to work at rated frequency and perfect sinusoidal load current .Now days use of non linear load has increased a lot ,so losses due to harmonic current has increased .This in turn detoriates the insulation of the winding and life of transformer due to heating .In this paper a 200 KVA 3 phase distribution transformer is taken and losses has been calculated under linear load ,using two methods . i.e computational method and simulation method .Also losses due to harmonic current has been calculated analytically and has been compared with losses of linear load. For simulation method ,a SIMULINK model of transformer is designed and finally both the method has been compared
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