The effects of linear and nonlinear operation modes in transformers

Abstract

The work presented in this paper deals with the effects of four modes of transformer operation, namely, non(sinusoidal) source voltage and non(linear) loads. The results are presented and compared with the experimental results of the actual values of the Excitation Current THD, Core Voltage THD, K Rating, Harmonic Loss Factor and Efficiency on a loaded single phase two winding transformer that are computed using online measurements from the primary and secondary sides. K rated transformers are designed for power harmonic generating loads by manufacturers that carry additional harmonic currents, so iron losses or copper losses can be decreased and efficiency can be increased. For this reason, a nonlinear overload is supplied without overheating, excessive voltage distortion and exceeding the specified capacity of the transformer.