Digital Relay Protection Filter

Digital protective relays use finite impulse response filters with sliding data windows for band-pass filtering of voltages and currents and measurement of phasors. Cosine, Fourier, and Walsh data windows are commonly used. There are two methods of calculating the Discrete Fourier Transform: Recursive and Non-recursive. The Non-recursive method requires that each sampled data point be saved in memory (amount of data is determined by the "window" size) and that the entire summation process be performed for every. Keywords: POWER SYSTEM PROTECTION, VARIABLE-WINDOW FILTER, WINDOW RESIZING. Presented at the V Seminário Técnico de Proteção e Controle Curitiba, Brazil August 28–September 1, 1995 P...

Digital Relay Protection Filter - E-Motional Optics & Connectivity [PDF]

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