دانلود مقاله ISI انگلیسی شماره 147955
ترجمه فارسی عنوان مقاله

یک طرح حفاظت دیفرانسیل موج برای خط انتقال نیمه طول موج

عنوان انگلیسی
A travelling wave differential protection scheme for half-wavelength transmission line
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
147955 2018 9 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : International Journal of Electrical Power & Energy Systems, Volume 99, July 2018, Pages 376-384

ترجمه کلمات کلیدی
خط انتقال نیم طول موج، حفاظت دیفرانسیل، موج حرکتی، مدل خط پارامتر توزیع شده
کلمات کلیدی انگلیسی
Half-wavelength transmission line; Differential protection; Travelling wave; Distributed parameter line model;
پیش نمایش مقاله
پیش نمایش مقاله  یک طرح حفاظت دیفرانسیل موج برای خط انتقال نیمه طول موج

چکیده انگلیسی

Half-wavelength transmission technology is getting more and more attention due to its excellent characteristics such as large transmission capacity and long transmission distance. Traditional differential protection is not applicable to half-wavelength transmission line because of the impact caused by large distributed capacitance current. Travelling wave (TW) differential protection is not affected by distributed capacitance current, so it can be applied to long EHV/UHV transmission line. However, when directly applied to half-wavelength transmission line, large unbalanced differential current will appear during external faults, since the resistance of the line and the frequency-dependent feature of the line parameters which are neglected by TW differential protection have such great impact that they cannot be neglected anymore. In order to improve the performance of TW differential protection, this paper proposes a scheme which has taken the resistance into account and uses power-frequency component of the differential current to identify fault for the purpose of avoiding the influence of the frequency-dependent feature of the line parameters. Simulation results verify that the proposed scheme is effective in reducing the unbalanced differential current, and as a result, ensures the selectivity of the protection. The scheme also has high sensitivity during internal faults with large fault resistance.