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PDF | Proliferation of harmonics in power distribution systems, which are using increased nonlinear loads, have become a power quality problem for both. This will distort the supply voltage waveform. Thus voltage harmonics are generated. Long cable runs, high impedance transformers, etc. contribute to higher NTPC ELECTRIC SUPPLY COMPANY Ltd. 1 Distribution Transformers -Impact of Harmonics, Estimation of Losses and Life expectancy & Mitigation of ill effects M.In the case of a single phase transformer the harmonics are confined mostly to the primary side as the source impedance is much smaller compared to the load Transformers are major components in power systems. The increased losses due to harmonic distortion can cause excessive losses and hence abnormal temperature