Abstract:

The paper considers a model of insulation construction in a programming environment and the inclusion of this model's research in the education of students in electrical engineering.
In the conditions of a global pandemic due to Covid 19, the almost all learning in university settings took place in electronic environments. The development of models of various electrical devices and their study in software environments are indispensable in teaching engineering science.
Future electrical engineers need to carefully study the insulation construction of the electrical devices used for energy transmission and distribution. The students need to be able to assess the condition of the electrical insulation. To achieve this goal, they must theoretically know the main characteristics of insulation materials and apply them in the evaluation of a facility. A modern trend of the practical measurements is to introduce systems for continuous monitoring (on-line monitoring) of electrical insulation. The advantage of monitoring systems is their ability to detect defects in insulation systems at an early stage of their development. It allows to determining adequate measures for elimination of defects, to predict the time for trouble-free operation, and to determine the type and volume of repair work.
For students to gain the necessary knowledge in the field of insulation constructions, a model of a bushing as an example is used in the Matlab software environment. Its state is determined by monitoring the parameter of the tangent of the dielectric loss angle. A proposed model of the behavior of the real energy system with a complex voltage change is studied. The three-phase system and its operation in case of simulated deterioration of the insulation of the bushing in one of the phases are considered. The methodology, proposed in this paper, was used in the on-line training during the quarantine because of Covid 19 in the disciplines "High voltage technique" and "Insulation Constructions and Systems", studied by students majoring in "Electrical Engineering" and "Power Supply and Electrical Equipment" of Faculty of Physics and Technology at University of Plovdiv Paisii Hilendarski (Bulgaria). The use of simulations of various electrical devices in high engineering education is used to better understand the nature of phenomena in the energy system. This helps students gain assurance and good practical training even in a pandemic and distance learning environment.

Keywords:

Education, Computer Simulation, Electrical Engineering, Bushing, Insulation construction, High voltages.