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Theoretical Temperature Distribution Investigation in Electrical Transformer by Using Nano-Technology

Authors: Ibtisam A. Ha san --- Sahar R. Fafraj --- Azhar K. Azeez
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 12 Part (A) Engineering Pages: 2282-2295
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A proposed thermal model is examined for a distribution transformer. A 2d simulation by a transient analysis in light of the Finite Element Method (FEM) was done to obtain the temperature distribution in the three phase transformer (250 KVA 11/.416 KV core type, mineral oil) using "ANSYS PROGRAM". Meanwhile, the effects of type of oil on HOST are investigated using the proposed model. To test the effect of nanoparticles on heat transfer process, the insulation oil was changed with Nanofluid; it has been used two types of Nano particles (CuO and Al2O3) with 0.5% as a volume concentration, where themaximum temperature reduced about (5%).The core material also has been changed from silicon steel to amorphous steel and caused a reduction in maximum temperature about (9.9%) in HV winding and change the interior angles from 90o to 135o, where the temperature distribution transformer is improved. The present model successfully accomplished for expecting the temperature distribution at any locations in the transformer when compared with practical measurement.


Article
MODELING AND MODIFICATION FOR DISTRIBUTION TRANSFORMER (250 KVA, 11/0.416 KV) TO REDUCE THE TOTAL LOSSES
نمذجة وتطوير محولة توزيع (250 KVA, 11/0.416KV)

Authors: Assist. Prof. Ibtisam A. Hasan --- Dr. Sahar R. Fafraj --- Eng. Azhar K. Azeez
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2016 Volume: 9 Issue: 4 Pages: 479-491
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

This paper presents the electromagnetic model for the 3- phase distribution transformer 250 KVA 11/.416KV core type. This model based upon using "ANSYS PROGRAM" to obtain the flux density distribution and losses, in this work, it has been change core material from silicon steel (Si.St.) to amorphous steel (Am. St.). Where, the iron losses reduction with 90%. The result for computer program are compared with practical measurements.

عرض البحث الحالي نمذجه كهرومغناطيسية لمحولة توزيع ثلاثية الأطوارKVA250 , 11/.416 فولت,50هيرتز مغطسة بالزيت من نوع اللب. نفذ الموديل المقترح بمساعدة التسهيلات التي يوفرها برنامج "ANSYS " للحصول على توزيع كثافة الفيض المغناطيسي وإيجاد الخسائر للمحولة. وقد تم تغيير مادة قلب المحولة من سيلكون ستيل إلى مادة الاستيل العشوائية حيث قلت الخسائر الحديديه بنسبة 90%.النتائج التي تم الحصول عليها من البرنامج قورنت مع النتائج العمليه المقاسه.

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