Effect of Voltage Unbalances on the Performance of a Three-phase Transformer

Abstract Mitigation and adaptation to climate change have been major driving forces in modernizing electric power infrastructure. Low quality has a significant impact on electrical equipment efficiency. Voltage unbalances one of the issues with low quality. This study used simulation method for supply voltage unbalance evaluate effect performance 3-phase transformers. The research results show that when occurs, working point maximum efficiency shifts transformer is reduced all load cases. When there an increase VUF, reduced. With small drop insignificant, but VUF greater than 3%, starts increase. In case unbalance, positive sequence phase voltage, both no-load loss significantly. Both these losses are less voltage. Due shift, almost unchanged. starting general studies