الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
the significance of harmonics in power systems has increased substantially due to the use of solid state controlled loads and other high frequency producing devices. an important consideration when evaluating the impact of harmonics is their effect on power system components. transformers are major components in power systems. the increased losses due to harmonic distortion can cause excessive winding loss and hence abnormal temperature rise. existing standards give a procedure to determine the capability of an existing transformer subject to nonsonusoidal load currents based on conservative assumptions. this research studies the impact of power harmonics on power transformer. this phenomenon increases the power losses, over loading, over voltage conditions, accelerate aging of life and failure probability of transformer. the research refers to the importance of mitigation this phenomenon, and presents a typical case study of high voltage power transformer which exists in egyption electricity transmission company (EETC).the electrical power network is simulated using the ETAP6.0.0.