Browsing by Author "Youssef, OAS"

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    A modified wavelet-based fault classification technique
    (ELSEVIER SCIENCE SA, 2003) Youssef, OAS
    This paper presents a new Wavelet-based fault classification technique that utilises the HF components confined to scale-8 (level-3) of Wavelet analysis of the three line currents in transmission line. Data window required for the algorithm is small (less than half power frequency cycle based on 1.0 kHz sampling rate). In the paper firstly the theoretical background is reported and briefly discussed in relation to reference 'IEEE, T&D Conf. (2001)'. Then, an extended study is conducted, and the proposed method is described in detail. Finally, some case studies are examined using the EMTP and MATLAB softwares in order to highlight the performance of the method. It is proved that the proposed technique is reliable and appropriate for real-time measurement algorithms and fault classification techniques. (C) 2002 Elsevier Science B.V. All rights reserved.
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    A wavelet-based approach for protection of generators against unbalanced currents
    (ELSEVIER SCIENCE SA, 2002) Youssef, OAS
    This paper presents a new wavelet-based negative-phase sequence (unbalanced currents) protection scheme for synchronous generators. The scheme utilizes the three line voltages and the three line currents available at the generator terminals. Wavelet transform concept is presented. The principle of operation of the algorithm is introduced. Feature extraction technique is derived. Data window necessary for the algorithm is ten samples based on 1200 Hz sampling frequency. Generated data from the simulation of a model power system using EMTP were used in the MATLAB software to test the performance of the technique. The performance under different system conditions is discussed. The results show that the new approach provides robust and accurate classification for a variety of power system conditions. (C) 2002 Elsevier Science B.V. All rights reserved