The extensive utilization of electronic power equipment in power transmission networks has led to a constant increase in the number of potential sources of magnetization with direct current components. The reviewed literature appears to be Jacking of a detailed analysis of the way in which a DC bias effect power transforms. In this work, the investigation of the effect having DC bias current to the primary and secondary voltages and currents. MATLAB simulation and experimental phase were carried by the researcher to verify such effect. The simulation result showed that the amount of the DC bias and the magnetization curve play the key roles in determining the electrical and input-output properties of the power transformer. The result also revealed that positive DC bias will increase the effective gain for positive cycles of the current. On the other hand, negative DC bias increases the effective gain for the negative part of the current waveforms. Therefore, the phenomenon are called as half-cycle saturation displayed in
this work. These findings provide the insights necessary for understanding the DC bias effect in power transformers. The simulations and experimental results showed that the amount of the DC bias and the magnetization curve can be effectively used to indicate the electrical and input-output properties of the power transformer.
