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In protection relaying schemes, the digital filter unit plays the essential roles to calculate the accurate phasor. However, the decaying DC components in fault currents always cause false operations of relay systems. This paper presents a new filter scheme which can remove such components from fault currents. Using the proposed scheme, the full-cycle DFT (FCDFT) only needs one-cycle samples to obtain...
In this paper, practical considerations for recursive Discrete Fourier Transform (DFT) implementation in numerical relays are presented. The DFT filter instabilities which would produce accumulated errors are emphasized. The aspects ruling error accumulation of the estimated magnitude and phase are highlighted. Novel solutions directed for the elimination of error accumulation are proposed and intensively...
This paper is focused on the analysis of numerical protection algorithms applied to transmission lines with series compensation. Particularly, the analysis evaluates the behavior of numerical distance protection relay algorithms, The simulation of the distance algorithm routines is based on two different techniques: the one cycle discrete Fourier filter and the filter based on the line differential...
In this paper, practical considerations for recursive discrete Fourier transform (DFT) implementation in numerical relays are presented. The DFT filter instabilities which would produce magnified errors are emphasized. The aspects ruling error magnification of the estimated magnitude and phase are highlighted. Novel solutions directed for the elimination of error magnification are proposed and intensively...
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