College of Engineering

A Master thesis was discussed in Department of Electrical Engineering / College of Engineering at University of Mosul entitled ” Analysis and Evaluating the Impact of Space Charge Accumulation on Electric Field Behavior in XLPE HVDC Cables ” submitted by (Mohammed Mowafeq Younis Tawfeeq ), Supervised by Asst. Prof. Dr. Dawood Najem Saleh Al-Jubouri on Monday, August, 25, 2025.
The thesis presented by, “Mohammed Mowafeq Younis Tawfeeq”, aimed “Clarifying the various design and operational reasons that lead to the accumulation of space charges in HVDC capacitors and how these charges affect the distribution of the electric field, thus enabling designers to develop tools and strategies to predict the degradation of the insulator and obtain capacitors with reliability and good performance”
The thesis discusses “Mechanisms of charge accumulation, how the temperature of the conductor, the thickness of the insulator, the time factor, the presence of impurities in the insulator, voltage changes, and design defects affect the deformation of the electric field, and what are the reasons that led to the deterioration of the insulator and the movement of charges within it, and the factors that caused the obstruction of the movement of charges, and the difference in conductivity and finally its accumulation in the insulator”
The results showed “The temperature of the insulator is grading, so there will be a difference in conductivity, and the movement of charges slows down according to the decrease in conductivity, and finally it accumulates, as well as the distortion in the electric field reached 1.68, as well as the study of increasing the thickness of the insulator showed an improvement in the distribution of the electric field, where the distortion reached 0.599, and thus the increase in the voltage of the conductor led to an increase in the distortion to 3.6, and this shows the negative impact of these studies on the distribution of the electric field. XLPE insulator and HVDC Cables”
The current study is considered a sustainable study to achieve the Sustainable Development Goals, particularly Goal 9 “Industry, Innovation, and Infrastructure” and Goal 11 “Sustainable Cities and Communities”, by analyzing the mechanisms of space charge accumulation within the insulator in detail, with a systematic study of influencing factors such as conductor temperature, insulator thickness, applied voltage levels, physical impurities, and semiconductor layer defects. Simulations were performed using the finite element method (FEM) via COMSOL Multiphysics, integrating multiple electrical and physical models.