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Ayyoub Zouaghi - IEEE Xplore Author Profile

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The potential of solar energy as a sustainable power source remains hindered by various efficiency limitations. One of the major challenges is the accumulation of dust on photovoltaic (PV) panels, leading to the decrease of the efficiency and the need for regular cleaning. To address this issue, this work aims to explore the use of ionic wind, generated by corona discharge, as an innovative method...Show More
The aim of the present work is to investigate the efficiency of electro-optic electric field sensor to characterize and detect the partial discharges in medium or high voltage equipment such as air or gas insulated switchgear. Partial discharges (PD) are frequently caused by an increase in the electric field surrounding conductors (metal particles, spikes, etc.) or at the level of cavities and cra...Show More
The use of high voltage direct current (HVDC) transmission technology has increased significantly in recent years due to its numerous advantages over traditional alternating current (AC) transmission. The aim of the present work is to investigate the efficiency of different non-intrusive sensors for partial discharge measurement in medium or high voltage direct current equipment such as air or gas...Show More
The aim of this paper is to study Pockels effect-based electro-optic sensor to characterize corona and dielectric barrier discharges (DBD). Electric discharges are integral to many industrial processes like surface treatment and air purification. In electrical engineering, partial discharges (PD) have undesirable effects because of their potential to accelerate the insulation aging in high-voltage...Show More
Fast and very fast transient overvoltages generally appear during switching operations within electrical substations. The oscillatory nature of such phenomena with frequencies that can reach several tens of megahertz tends to degrade the lifetime of high voltage equipment such as bushings and transformers, inducing partial discharges activity or breakdown of the insulation system. According to sev...Show More
High Voltage Direct Current (HVDC) links make it possible to transmit energy for long distances with lower losses. The development of more reliable insulation systems for HVDC components cannot be achieved without understanding the mechanisms of discharge inception and propagation, not only under HVDC constraints, but also under particular conditions such as HVDC superimposed lightning impulse. In...Show More
In high voltage direct current (HVDC) topology, the transformer insulation system continuously experiences nonsinusoidal voltage waveforms due to its proximity with the power converters. This may cause changes in the discharge mechanisms, and as a consequence, the isolation system might undergo accelerated degradation. This study aims at investigating partial discharge (PD) measurements with diffe...Show More
PCB embedded technology is a promising packaging method for power electronics devices. But the increase of the voltage rating and the cooling needed induce new issues in the insulation and the thermal management. In traditional power modules, thermal and insulation management are decoupled. Using a dielectric liquid could be an interesting solution for addressing both issues simultaneously. In thi...Show More
SiC based wide bandgap power modules are well known for their performance in high voltage, high frequency and high temperature conditions. The use of high voltage in small gaps increases significantly the risk of partial discharge (PD) activity, which can lead eventually to a breakdown and cause an irreparable failure of the module. Thus, new insulating materials and packaging structures are requi...Show More
In this paper, the performance of a miniature plane-to-plane dielectric barrier discharge electrostatic precipitator (DBD-ESP) is investigated experimentally. The particles under investigation have a sub-micrometer size range. Two different configurations have been studied: the first is one-stage DBD-ESP where the particle charging and collection processes act simultaneously. The second is two-sta...Show More
Reducing the unwanted electrostatic charge to a safe level is the goal of any charge neutralization device. The aim of the present work is to study the influence of the voltage waveform and frequency on the efficiency of charge elimination by using a wire-to-grid dielectric barrier discharge (DBD). The DBD electrode was subjected to high voltages of various waveforms, amplitudes and frequencies. T...Show More
The main objective of this paper is to develop a novel two-stage-type electrostatic precipitator to collect finely ground lignocellulosic particles. To prevent the danger of explosion of such a powdery material, ion generation and particle charging processes are separated. Main results show that the particles can be highly charged in a two-coaxial-cylinders triode-type device, which also facilitat...Show More
The aim of this paper is to investigate the motion of fine dielectric particles on an electrodynamic board (EDB) with interdigitated electrodes. This work is composed of two parts. In the first part, the trajectories of the particles are studied using an experimental setup. A high speed camera records videos of particles motion above the EDB surface, as a function of different parameters, such as ...Show More
The main objective of this paper is to develop a novel two-stage-type electrostatic precipitator to collect finely ground lignocellulosic particles. To prevent the danger of explosion of such a powdery material, ion generation and particle charging processes are separated. Main results show that the particles can be highly charged in a two-coaxial-cylinders triode-type device, which also facilitat...Show More
In this experimental work, atmospheric pressure dielectric barrier discharge (DBD) is generated in plane-to-plane configuration under square alternative (AC) and nanosecond pulsed (NP) high voltage excitations. The aim is to investigate their efficiency for submicron particles electrostatic precipitation. The AC and NP high voltage signals have rise and fall times of about 30 μs and 50 ns, respect...Show More
This paper deals with the variation of the time lag to breakdown upon the physical and geometrical parameters of a barrier inserted in a divergent point-to-plane electrode system under lightning impulse voltages. It is shown that in presence of an insulating barrier, the time lag to breakdown is significantly increased. This increase mainly depends on the barrier position in the gap, its radius an...Show More
This paper deals with the influence of insulating barriers on the dielectric strength of two electrode arrangements - point-to-plane and point-to-point under dc voltage. It is shown that the dielectric strength of such insulating structures is the improved when the barrier is inserted near the sharp electrode. The effectiveness of the barrier depends on the geometry and the physical nature of the ...Show More
This work is devoted to the influence of insulating barriers on the trajectory of the discharge structure, the breakdown voltage and the time lag to breakdown in a point-plane electrode arrangement for long oil gaps. It is shown that the barrier parameters (nature, dimensions and position) play a significant role in the improvement of the dielectric strength of the system. It was observed that the...Show More
The influence of barriers on the dielectric strength of oil gaps is analyzed according to the electrode geometry, the dimensions and the position of the barrier, and the polarity of the voltage. It shown that the effectiveness of an insulating barrier, namely the ratio of the breakdown voltage of oil gaps in presence of barrier to that one without barrier, in a divergent field, is the higher when ...Show More