Characterization of Power Transformer Electromagnetic Forces Affected by Winding Faults
- سال انتشار: 1397
- محل انتشار: مجله بهره برداری و اتوماسیون در مهندسی برق، دوره: 6، شماره: 1
- کد COI اختصاصی: JR_JOAPE-6-1_004
- زبان مقاله: انگلیسی
- تعداد مشاهده: 161
نویسندگان
Department of Electrical Engineering, Azarbaijan Shahid Madani university, Tabriz, Iran. Email: behjat@azaruniv.edu
Department of Electrical Engineering, Engineering Faculty, Azarbaijan Shahid Madani University, Tabriz, Iran
Department of Electrical Engineering, Engineering Faculty, Shahid Madani University, Tabriz, Iran
چکیده
Electromagnetic forces in power transformer windings are produced by interaction between the leakage fluxes and current passing them. Since the leakage flux distribution along the windings height is in two axial and radial directions, so the electromagnetic forces have two components, radial and axial. There is a risk that a large electromagnetic force due to the short circuit or inrush currents, can cause the windings to be deform, rupture, and/or displace, if the transformer and winding holders structure is not designed or assembled properly. Also, these mechanical changes can damage insulation between two or more adjacent turns of a winding and so, produce the local inter-turn fault. Occurrence of any fault in windings will change the electromagnetic force distribution in transformers and will cause developing secondary faults. Hence, this contribution is aimed at characterizing the electromagnetic forces behavior in power transformers and determines the changes of force values after occurring winding mechanical and inter-turn. The study keeps at disposal a two-winding, three phase, ۸ MVA power transformer, on their windings faults are imposed and investigated through the FEM analysis. The accuracy of the created FEM model is firstly validated using analytical methods for transformer healthy condition, and then the winding shorted turn fault along with the mechanical faults are considered using ۳D FEM model. The extracted characteristic signatures attained to different type of winding faults is expected to be useful at the design stage of power transformers.کلیدواژه ها
ترانسفورماتور قدرت, نیروهای الکترومغناطیسی, روش اجزاء محدود, خطاهای مکانیکی سیم پیچی, خطای اتصال کوتاه حلقهاطلاعات بیشتر در مورد COI
COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.
کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.