Waleed Abdelaziz Salem Attia <br/><br/>
Improving power transformer characteristics by using K- factor and narrow band width transformer (NBT) system /  
 تحسين اداء محولات القدرة الكهربية باستخدام معامل اعادة التقييم ومحولات ذات النطاق الترددى الضيق 
Waleed Abdelaziz Salem Attia ; Supervised Ossama Elsayed Gouda , Ghada Mohamed Amer 
 - Cairo :   Waleed Abdelaziz Salem Attia ,   2012 
 - 134P. :   charts , facsimiles ;   30cm 
<br/><br/>Thesis (Ph.D.) - Cairo University - Faculty of Engineering - Department of Electrical power and Machines 
<br/><br/> Thesis work is foused on improving power transformer characteristics by using K- factor and narrow band width transformer (NBT) system . IEEE and thermal models of power transformer are modeled for 25 MVA, ona , ONAF cooling transformer . This thesis reviews the non linear loads effects on the transformers and the standard IEEE proced for derating of transformers which are under distorted currents 
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<br/><br/><label>Subjects--Index Terms: </label>Harmonics   Hot spot temperature  Power transformer