Browsing by Author "Bouderbala, R."

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Digital differential relay reliability enhancement of power transformer
(2011) Bouderbala, R.; Bentarzi, Hamid; Ouadi, A.
In this paper, an improvement of digital differential relay reliability for protecting a large power transformer is discussed. First, the Fourier sine and cosine coefficients required for fundamental, second, third and fifth harmonics determination have been calculated using rectangular transfer technique. Then, these harmonics have been used in harmonics restrain and blocking techniques used in differential protection system. Simulation testes have been carried out on a variety of magnetizing conditions (normal aperiodic inrush and over excitation conditions) using Simulink/MATLAB. The obtained results shows that the developed approach provides good discrimination between the magnetizing current and the internal fault current
A new approach applied to a digital differential protection of large power transformer
(2010) Bouderbala, R.; Bentarzi, Hamid; Ouadi, A.
Simulation of ion density distribution in the gate oxide of MOS structures
(Modelling, Measurement and Control A, 2003) Bentarzi, Hamid; Bouderbala, R.; Zerguerras, A.
In this work, the simulation of ions density distribution evolution within the oxide of MOS structures is performed. This simulation is achieved by solving the partial differential equation (PDE), which governs the motion of the ions in the oxide layer, subject to boundary and initial conditions. Since no closed form analytical solution is available in the literature to solve this important problem, a numerical technique based on Crank-Nicholson method is used. The evolution of ions density distribution is simulated for different values of such parameters as applied electric field and device temperature using BTS technique. The simulation results agree well with the experimental results as well as the previous published results