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    Accurate fault location algorithm for power transmission lines

    , Article European Transactions on Electrical Power ; Volume 10, Issue 5 , 2000 , Pages 313-318 ; 1430144X (ISSN) Sadeh, J ; Ranjbar, A. M ; Hadjsaid, N ; Feuillet, R ; Sharif University of Technology
    John Wiley and Sons Ltd  2000
    In this paper we propose a new fault location algorithm for power transmission lines based on one terminal voltage and current data. A distributed time domain model of the line is used as a basis for algorithm development. The suggested technique only takes advantage of post-fault voltage and current samples taken at one end of the line and does not require filtering of DC offset and high-frequency components of the recorded signals, which are present during transient conditions. Another advantage of the proposed method is the application of a very narrow window of data i. e. less than 1/4 of a cycle. The paper also proposes two different algorithms for lossless and lossy line models.... 

    An IGBT-Based high-voltage crowbar for minimizing the fault current interruption time and injected fault energy during the vacuum arc fault in microwave tubes

    , Article IEEE Transactions on Plasma Science ; Volume 49, Issue 6 , 2021 , Pages 1941-1947 ; 00933813 (ISSN) Pouresmaeil, K ; Kaboli, S ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2021
    In conventional high-voltage power supplies used for driving the microwave tubes, the shunt crowbar, which generally consists of series-connected thyristors, protects the microwave tube against the vacuum arc fault. In the case of arc fault, the thyristor-based crowbar is closed as a parallel path and diverts the fault current through itself. It avoids serious damage to the microwave tube. However, thyristor switches usually have a limited rate of rise of ON-state current (di/dt), which necessitates placing a series inductor in the crowbar path. Thus, satisfying all protection limits of microwave tubes-including the injected fault energy and the fault current interruption time-is a... 

    The coupled microfluidic microbial electrochemical cell as a self-powered biohydrogen generator

    , Article Journal of Power Sources ; Volume 451 , 2020 Fadakar, A ; Mardanpour, M. M ; Yaghmaei, S ; Sharif University of Technology
    Elsevier B.V  2020
    Due to the importance of hydrogen as an effective antioxidant for its applications in therapy, this research reports the fabrication of a coupled microfluidic microbial electrochemical cell (MXC), including microfluidic microbial fuel cells (MFCs) and a microfluidic microbial electrolysis cell (MEC) series in order to perform it as a self-powered biohydrogen generator. Being able to be a platform of implantable medical devices, utilization a non-phatogenic strain of Escherichia coli as the biocatalyst in order to exploit the embodied energy from human blood and excrement and finally the use of cheap and facile materials (<$2 per device) are the exceptional features of the system. The...