توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Digital Distance Protection Design Using Combination of Least Squared Error and Differential Equation Algorithms
نویسنده(ها): ، ،
اطلاعات انتشار: نوزدهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۷
Power system protective relays protect electric systems against system faults and abnormalities. Due to increasing advantages of digital relay algorithms, nowadays modern power system protective relays are mostly microprocessor based. Digital based algorithms are used in these relays to implement different relaying schemes. In this paper a new combined method using combination of both differential equation and least square error algorithms is presented. The proposed method is explained analytically and modeled appropriately. Simulation results are performed using two powerful power system softwares, MATLAB and PSCAD, and some simulation results are presented as well. The efficiency and reliability of this method could be perceived by the obtained simulation results.<\div>

۲Improvement of Overcurrent Protection Reliability Using Phasor Study
نویسنده(ها): ، ،
اطلاعات انتشار: نوزدهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۹
Capability of the power system protection scheme to introduce a reliable and secure relay response has become a critical matter. Digital relays use special algorithms to filter unwanted components of the input signal and extract the fundamental component. Meanwhile, proper techniques must be used to prevent mal–trip of such relays, due to transient and harmonic currents in the network. This paper, presents using the real and imaginary part of current phasor in order to discriminate between fault and non–fault events. Some typical transient currents due to transformer energizing, capacitor switching and induction motor starting are simulated in Power Factory software and results of using the method are discussed and illustrated.<\div>

۳Power Transformer Differential Protection Relay Using Half Cycle Fourier Algorithm
نویسنده(ها): ، ،
اطلاعات انتشار: هجدهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۳
In this paper design, computational aspects and experimental results of a microprocessor based digital transformer differential relay is described. Half cycle Fourier algorithm is used to estimate current phasors. Performance of the proposed relay is tested for different faults including internal and external faults. The ability of the relay to restraint for inrush current is discussed and demonstrated. Test results of the proposed algorithm highlight the abilities of the algorithm. Test results for external fault, internal fault and inrush current are presented in the paper.<\div>

۴Current Transformer Transient Behavior Analysis And modeling
نویسنده(ها): ،
اطلاعات انتشار: هجدهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۲
In this paper current transformer transient analysis and modeling are studied. A computer program has been developed to simulate a CT core. The paper describes an iterative method to model the CT core transient behavior during a system short circuit fault. Different parameters and actors could be selected in the software and their amounts am changed to investigate their effect on the CT transient response. These results can be used to comprehend the transient behavior of the CT and make real test signals for testing protective relays based on the actual behavior of current ~formers. The effect of CT Transient and saturation on different protective schemes such as distance and breaker failure algorithm could be studied using the developed software.<\div>
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