کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11020663 | 1715672 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improved differential relay for bus bar protection scheme with saturated current transformers based on second order harmonics
ترجمه فارسی عنوان
رله دیفرانسیل بهبود یافته برای طرح حفاظت از نوار اتوبوس با ترانسفورماتورهای جریان اشباع بر اساس هارمونیک های مرتبه دوم
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
چکیده انگلیسی
Differential relays security to the external faults is affected by the saturation of branches' current transformers (CTs). In this paper, a simple scheme is proposed to enhance the security of differential numerical relay by extracting the 2nd order harmonic using Fast Fourier Transform (FFT) to produce a restraint signal to inhibit the relay operation during external faults. The operation signal of differential relay is produced by comparing the vector addition of secondary currents of branches' CTs (differential current) with pre-set value; the restraint signal is produced by comparing the algebraic sum of 2nd order harmonic of individual secondary currents with the 2nd order harmonic of differential current. The proposed scheme is investigated using PSCAD/EMTDC simulation and tested during internal and external faults for saturated CTs. The obtained results reveal how this scheme is effective and secure to the external faults for different suggested scenarios. The proposed scheme is using the simplest technique of signal processing compared to other proposed techniques.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of King Saud University - Engineering Sciences - Volume 30, Issue 4, October 2018, Pages 320-329
Journal: Journal of King Saud University - Engineering Sciences - Volume 30, Issue 4, October 2018, Pages 320-329
نویسندگان
Mohammed Qais, Usama Khaled, Saad Alghuwainem,