بهبود عملکرد حفاظت مقايسه فاز در خطاهای با جريان اتصالی کوچک با استفاده از تخمين مؤلفه جريان بار
الموضوعات :
مجید صنایع پسند
1
(دانشگاه تهران)
میثم جعفری نوکندی
2
(دانشگاه تهران)
الکلمات المفتاحية: بازسازی مؤلفه اتصال کوتاهجريان اتصالیجريان بارحفاظت مقايسه فاز,
ملخص المقالة :
در خطاهاي با جريان اتصالي کوچک، جريان بار تأثير زيادي بر اختلاف فاز ميان جريان‌هاي دو سر خط دارد و حفاظت مقايسه فاز معمولاً قادر به تشخيص اين‌گونه خطاها نيست. در اين مقاله يک روش براي بهبود عملکرد مقايسه فاز در اتصالي‌هاي با جريان اتصالي کوچک پيشنهاد شده است. در روش پيشنهادي با تقريب‌زدن فازور جريان بار و کسر آن از جريان خطا، مؤلفه‌هاي واقعي جريان اتصال کوتاه به‌طور تقريبي بازسازي مي‌شوند و در نتيجه، روش پيشنهادي اختلاف فاز ناشي از جريان بار را تا حد زيادي حذف مي‌کند. از جريان قبل از خطاي خط به‌عنوان تخمين جريان بار در زمان اتصال کوتاه استفاده شده است. نشان داده شده است که اين فرض تقريبي در اتصالي‌هاي با جريان خطاي کوچک، عملکرد حفاظت مقايسه فاز را بهبود مي‌بخشد. ضمن آنکه روش پيشنهادي با افزايش حساسيت واحدهاي تشخيص وقوع خطا در رله‌ها، تعيين نوع خطا را نيز با دقت بيشتري امکان‌پذير مي‌سازد. روش پيشنهادي در يک سيستم نمونه شبيه‌سازي شده است. نتايج به‌دست آمده نشان‌دهنده بهبود قابل توجه عملکرد حفاظت مقايسه فاز با استفاده از روش پيشنهادي مي‌باشد.
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