Transactions on Machine Intelligence 2821-1693 2 3 2019 09 01 Assessment and Modeling of Voltage Harmonics Impacts on Distribution Transformers Considering the Effects of Different Loads 154 168 206049 10.47176/TMI.2019.154 EN H. Nourizadeh M.Sc. Graduate, Power Engineering, Department of Electrical Engineering, Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran A. Nazeriyeh M.Sc. Graduate, Semnan Regional Electric Company Semnan, Iran L. Niknam M.Sc. Graduate, Semnan Regional Electric Company Semnan, Iran Journal Article 2019 06 08 Given the significance of power quality and the substantial impact of harmonics on power systems, evaluating the influence of harmonics on system components and loads is a crucial consideration. The importance of harmonics in power systems has significantly increased with the rising prevalence of nonlinear loads and other high-frequency generating devices. Transformers are one of the primary components in power systems. Supplying nonlinear loads via transformers leads to increased copper and iron losses, higher operational costs, premature insulation failure, and consequently, a reduction in the transformer's useful lifespan. Specifically, when a transformer supplies only linear loads, despite increases in load levels and ambient temperature, its lifespan is not diminished. However, in the case of transformers supplying nonlinear loads, the harmonic currents increase the load levels and losses in the transformer, thereby reducing its lifespan. Accordingly, this paper analyzes and evaluates the impact of harmonic distortion on a 630 KVA Y-Y connected distribution transformer under both linear and nonlinear load conditions. The evaluation demonstrates that the presence of higher-order harmonics significantly increases losses, resulting in a reduction of the transformer's lifespan. To analyze the transformer under harmonic conditions, Simulink/MATLAB software was employed. https://www.tmachineintelligence.ir/article_206049_430b3e123899cf8e1bf1e12e724a7fd1.pdf