استخدام معطيات اللوحة الاسمية لتحديد خواص القصر الثلاثي للمولد المتواقت أسطواني الدائر
Abstract
يتمحور البحث حول إمكانية رسم منحني القصر ثلاثي الطور للمولد المتواقت ذي الدائر الأسطواني من دون إجراء التجربة, اعتماداً على أربع من معطيات اللوحة الاسمية. لتحقيق هذه الغاية تم كتابة برنامج معتمداً على الأسس الرياضية لتشكيل مثلثات القصر للمولدات المتواقتة.
يتوقف الحساب في هذا البرنامج عندما يمرر المتحرض تياراً نسبياً مساوياً للواحد الصحيح بتقريب
(0.05%) أثناء التهييج بالتيار (Ifsh) في حالة القصر. في كل مرحلة من مراحل الحساب, يجب أن يكون تيار التهييج الاسمي (Ifn) مساوياً للمجموع الهندسي لتياري التهييج عند القصر(Ifsh) وعند العمل على فراغ (Ifb) .
تظهر نتائج البحث الدور الأساسي لعامل الاستطاعة في رسم مثلثات القصر للمولدات المتواقتة وأيضاً في رسم منحني نسبة الدارة القصيرة (S.C.R) ومنحنيات أخرى أثناء التشغيل : عامل التحميل الزائد (K), زاوية الحمولة وتياري التهييج الاسمي وعند القصر بالوحدات النسبية (I*fn),(I*fsh) في حين لا تتأثر هذه المنحنيات ببرامترات اللوحة الاسمية الثلاث الأخرى المدروسة في البحث.
This paper studies the possibility of drawing curve of three phase short circuit of synchronous generator without a laboratory experiment depending on only four data at nominal Nameplate. To do that, software has been built up depending on mathematical bases for making short triangles.
This software will stop from calculation when the relative current of the armature becomes nearly equivalent to one by error with (0.05%). In addition to that, the nominal (Ifn) must be equal to geometrical total of excitation current at short circuit (Ifsh) and open circuit (Ifb) in each step from calculation steps in the software.
Results show the main role of power factor in drawing the short triangles of synchronous generators, the curve (S.C.R) and other curves, and two exciting curves during work: over loading factor (K), loading angle currents for nominal and short circuit systems (I*fn),(I*fsh). On the other hand, these curves are not affected with the three parameters considered in the paper of the Nominal Nameplate.
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