Issue N° 3 / 2022 ForewordAim and ScopeEditorial Boards Investigation the transient over voltages and performance of on load tap changer (OLTC) …………...........…… Asaad SHEMSHADI, Mohamad Reza KHOJASTE 1 Performance Evaluation of the Wire to Multicylinders Electrostatic Precipitator with PVC Powder …….....…… Charifa BERKANE KRACHAI, Sidi Mohammed REMAOUN, Farid MILOUA 11 Numerical Study of a Semi-Industrial Electrostatic Separator of Ternary Plastic Granular Mixture …................ Chahinez MIMOUNI, Amar TILMATINE 16 Study of the Trajectory of Particles in an Electrostatic Separator with a Conveyor Belt ………………………. Hakima LABAIR, Amar TILMATINE 22 Electric Charge Distribution on the Surface of Insulating Materials Subjected to Corona Discharge ……… Ahmed BOUTEFFAHA, Abdelber BENDAOUD, Lucien DASCALESCU 27