دراسة أثر الإشباع المغناطيسي في محولات التيار على أداء حماية زيادة التيار الرقمية
Abstract
يعرض هذا البحث تأثير إشباع محولات التيار على أداء ريليهات زيادة التيار الرقمية, وذلك من خلال استخدام موجات تيارات لأعطال حقيقية حدثت في الشبكة الكهربائية لمصفاة بانياس. تبين الدراسة التحليلية التي أجريت باستخدام برنامج EMTP-ATP وبرنامج ماتلاب، أن الإشباع المغناطيسي يؤدي إلى انخفاض المطال لتيار العطل، وهذا بدوره يؤدي إلى عدم عمل حماية زيادة التيار وقيامها بفصل الجزء المعطوب.
بهدف التصدي لهذه المشكلة تمت دراسة خوارزميات مختلفة لتصحيح التشوه الحاصل في موجة تيار العطل والناتج عن الإشباع المغناطيسي في محولات التيار، ومن ثم استخدام خوارزمية للكشف والتصحيح. جرى التحقق من جودة أدائها باستخدام موجات تيارات الأعطال الحقيقية في المصفاة وكذلك تيارات تم الحصول عليها من نتائج الدراسة المنفذة باستخدام برنامج EMTP-ATP.
This paper investigates the transient behavior of CTs and its effect on numerical overcurrent relays during high fault level. The operation principles of all microprocessor-based relays are almost identical, although they utilize different filtering techniques.
The effects of CT saturation on microprocessor-based overcurrent relays are evaluated by implementing different fault scenarios (saturated waves), as input for the relay to analyze the transient behavior of microprocessor-based overcurrent relays due to the saturation of current transformer.
Current transformer (CT) saturation may cause mal-operation or operating time delay of protection relays. In this paper, a new algorithm for the compensation of the distorted secondary current due to CT saturation is suggested. Simulation results indicate that the algorithm can efficiently detect and correct each saturation period when the secondary current is severely distorted.
NOMENCLATURE:
CT(s): Current Transformer(s).
EMTP: Electromagnetic Transient Program.
ATP: Alternative Transient Program.
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