Szukana fraza: [Abstrakt = "This article discusses and compares algorithms for the phase shift measurement between the two signals and used in the electric power protection systems. The selected algorithms were theoretically analysed\: two using Fourier and Hilbert transformations, based on signal zero crossing detection and demodulation of the phase angle. The details of implementation in Scilab scientific environment were shown and their behavior under various operating parameters compared. The test signals were specified and later used in algorithms evaluation. Part one of the article refers to theoretical description of the implemented measurement algorithms."]

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